| File: | src/usr.bin/ssh/ssh/../channels.c |
| Warning: | line 4013, column 3 Value stored to 'port_to_connect' is never read |
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| 1 | /* $OpenBSD: channels.c,v 1.411 2022/01/06 21:48:38 djm Exp $ */ |
| 2 | /* |
| 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
| 6 | * This file contains functions for generic socket connection forwarding. |
| 7 | * There is also code for initiating connection forwarding for X11 connections, |
| 8 | * arbitrary tcp/ip connections, and the authentication agent connection. |
| 9 | * |
| 10 | * As far as I am concerned, the code I have written for this software |
| 11 | * can be used freely for any purpose. Any derived versions of this |
| 12 | * software must be clearly marked as such, and if the derived work is |
| 13 | * incompatible with the protocol description in the RFC file, it must be |
| 14 | * called by a name other than "ssh" or "Secure Shell". |
| 15 | * |
| 16 | * SSH2 support added by Markus Friedl. |
| 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
| 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
| 19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
| 20 | * |
| 21 | * Redistribution and use in source and binary forms, with or without |
| 22 | * modification, are permitted provided that the following conditions |
| 23 | * are met: |
| 24 | * 1. Redistributions of source code must retain the above copyright |
| 25 | * notice, this list of conditions and the following disclaimer. |
| 26 | * 2. Redistributions in binary form must reproduce the above copyright |
| 27 | * notice, this list of conditions and the following disclaimer in the |
| 28 | * documentation and/or other materials provided with the distribution. |
| 29 | * |
| 30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 40 | */ |
| 41 | |
| 42 | #include <sys/types.h> |
| 43 | #include <sys/stat.h> |
| 44 | #include <sys/ioctl.h> |
| 45 | #include <sys/un.h> |
| 46 | #include <sys/socket.h> |
| 47 | #include <sys/time.h> |
| 48 | #include <sys/queue.h> |
| 49 | |
| 50 | #include <netinet/in.h> |
| 51 | #include <arpa/inet.h> |
| 52 | |
| 53 | #include <errno(*__errno()).h> |
| 54 | #include <fcntl.h> |
| 55 | #include <limits.h> |
| 56 | #include <netdb.h> |
| 57 | #include <poll.h> |
| 58 | #include <stdarg.h> |
| 59 | #include <stdint.h> |
| 60 | #include <stdio.h> |
| 61 | #include <stdlib.h> |
| 62 | #include <string.h> |
| 63 | #include <termios.h> |
| 64 | #include <unistd.h> |
| 65 | |
| 66 | #include "xmalloc.h" |
| 67 | #include "ssh.h" |
| 68 | #include "ssh2.h" |
| 69 | #include "ssherr.h" |
| 70 | #include "sshbuf.h" |
| 71 | #include "packet.h" |
| 72 | #include "log.h" |
| 73 | #include "misc.h" |
| 74 | #include "channels.h" |
| 75 | #include "compat.h" |
| 76 | #include "canohost.h" |
| 77 | #include "sshkey.h" |
| 78 | #include "authfd.h" |
| 79 | #include "pathnames.h" |
| 80 | #include "match.h" |
| 81 | |
| 82 | /* XXX remove once we're satisfied there's no lurking bugs */ |
| 83 | /* #define DEBUG_CHANNEL_POLL 1 */ |
| 84 | |
| 85 | /* -- agent forwarding */ |
| 86 | #define NUM_SOCKS10 10 |
| 87 | |
| 88 | /* -- tcp forwarding */ |
| 89 | /* special-case port number meaning allow any port */ |
| 90 | #define FWD_PERMIT_ANY_PORT0 0 |
| 91 | |
| 92 | /* special-case wildcard meaning allow any host */ |
| 93 | #define FWD_PERMIT_ANY_HOST"*" "*" |
| 94 | |
| 95 | /* -- X11 forwarding */ |
| 96 | /* Maximum number of fake X11 displays to try. */ |
| 97 | #define MAX_DISPLAYS1000 1000 |
| 98 | |
| 99 | /* Per-channel callback for pre/post IO actions */ |
| 100 | typedef void chan_fn(struct ssh *, Channel *c); |
| 101 | |
| 102 | /* |
| 103 | * Data structure for storing which hosts are permitted for forward requests. |
| 104 | * The local sides of any remote forwards are stored in this array to prevent |
| 105 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local |
| 106 | * network (which might be behind a firewall). |
| 107 | */ |
| 108 | /* XXX: streamlocal wants a path instead of host:port */ |
| 109 | /* Overload host_to_connect; we could just make this match Forward */ |
| 110 | /* XXX - can we use listen_host instead of listen_path? */ |
| 111 | struct permission { |
| 112 | char *host_to_connect; /* Connect to 'host'. */ |
| 113 | int port_to_connect; /* Connect to 'port'. */ |
| 114 | char *listen_host; /* Remote side should listen address. */ |
| 115 | char *listen_path; /* Remote side should listen path. */ |
| 116 | int listen_port; /* Remote side should listen port. */ |
| 117 | Channel *downstream; /* Downstream mux*/ |
| 118 | }; |
| 119 | |
| 120 | /* |
| 121 | * Stores the forwarding permission state for a single direction (local or |
| 122 | * remote). |
| 123 | */ |
| 124 | struct permission_set { |
| 125 | /* |
| 126 | * List of all local permitted host/port pairs to allow for the |
| 127 | * user. |
| 128 | */ |
| 129 | u_int num_permitted_user; |
| 130 | struct permission *permitted_user; |
| 131 | |
| 132 | /* |
| 133 | * List of all permitted host/port pairs to allow for the admin. |
| 134 | */ |
| 135 | u_int num_permitted_admin; |
| 136 | struct permission *permitted_admin; |
| 137 | |
| 138 | /* |
| 139 | * If this is true, all opens/listens are permitted. This is the |
| 140 | * case on the server on which we have to trust the client anyway, |
| 141 | * and the user could do anything after logging in. |
| 142 | */ |
| 143 | int all_permitted; |
| 144 | }; |
| 145 | |
| 146 | /* Master structure for channels state */ |
| 147 | struct ssh_channels { |
| 148 | /* |
| 149 | * Pointer to an array containing all allocated channels. The array |
| 150 | * is dynamically extended as needed. |
| 151 | */ |
| 152 | Channel **channels; |
| 153 | |
| 154 | /* |
| 155 | * Size of the channel array. All slots of the array must always be |
| 156 | * initialized (at least the type field); unused slots set to NULL |
| 157 | */ |
| 158 | u_int channels_alloc; |
| 159 | |
| 160 | /* |
| 161 | * 'channel_pre*' are called just before IO to add any bits |
| 162 | * relevant to channels in the c->io_want bitmasks. |
| 163 | * |
| 164 | * 'channel_post*': perform any appropriate operations for |
| 165 | * channels which have c->io_ready events pending. |
| 166 | */ |
| 167 | chan_fn **channel_pre; |
| 168 | chan_fn **channel_post; |
| 169 | |
| 170 | /* -- tcp forwarding */ |
| 171 | struct permission_set local_perms; |
| 172 | struct permission_set remote_perms; |
| 173 | |
| 174 | /* -- X11 forwarding */ |
| 175 | |
| 176 | /* Saved X11 local (client) display. */ |
| 177 | char *x11_saved_display; |
| 178 | |
| 179 | /* Saved X11 authentication protocol name. */ |
| 180 | char *x11_saved_proto; |
| 181 | |
| 182 | /* Saved X11 authentication data. This is the real data. */ |
| 183 | char *x11_saved_data; |
| 184 | u_int x11_saved_data_len; |
| 185 | |
| 186 | /* Deadline after which all X11 connections are refused */ |
| 187 | u_int x11_refuse_time; |
| 188 | |
| 189 | /* |
| 190 | * Fake X11 authentication data. This is what the server will be |
| 191 | * sending us; we should replace any occurrences of this by the |
| 192 | * real data. |
| 193 | */ |
| 194 | u_char *x11_fake_data; |
| 195 | u_int x11_fake_data_len; |
| 196 | |
| 197 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
| 198 | int IPv4or6; |
| 199 | }; |
| 200 | |
| 201 | /* helper */ |
| 202 | static void port_open_helper(struct ssh *ssh, Channel *c, char *rtype); |
| 203 | static const char *channel_rfwd_bind_host(const char *listen_host); |
| 204 | |
| 205 | /* non-blocking connect helpers */ |
| 206 | static int connect_next(struct channel_connect *); |
| 207 | static void channel_connect_ctx_free(struct channel_connect *); |
| 208 | static Channel *rdynamic_connect_prepare(struct ssh *, char *, char *); |
| 209 | static int rdynamic_connect_finish(struct ssh *, Channel *); |
| 210 | |
| 211 | /* Setup helper */ |
| 212 | static void channel_handler_init(struct ssh_channels *sc); |
| 213 | |
| 214 | /* -- channel core */ |
| 215 | |
| 216 | void |
| 217 | channel_init_channels(struct ssh *ssh) |
| 218 | { |
| 219 | struct ssh_channels *sc; |
| 220 | |
| 221 | if ((sc = calloc(1, sizeof(*sc))) == NULL((void *)0)) |
| 222 | fatal_f("allocation failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 222 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "allocation failed"); |
| 223 | sc->channels_alloc = 10; |
| 224 | sc->channels = xcalloc(sc->channels_alloc, sizeof(*sc->channels)); |
| 225 | sc->IPv4or6 = AF_UNSPEC0; |
| 226 | channel_handler_init(sc); |
| 227 | |
| 228 | ssh->chanctxt = sc; |
| 229 | } |
| 230 | |
| 231 | Channel * |
| 232 | channel_by_id(struct ssh *ssh, int id) |
| 233 | { |
| 234 | Channel *c; |
| 235 | |
| 236 | if (id < 0 || (u_int)id >= ssh->chanctxt->channels_alloc) { |
| 237 | logit_f("%d: bad id", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 237 , 1, SYSLOG_LEVEL_INFO, ((void *)0), "%d: bad id", id); |
| 238 | return NULL((void *)0); |
| 239 | } |
| 240 | c = ssh->chanctxt->channels[id]; |
| 241 | if (c == NULL((void *)0)) { |
| 242 | logit_f("%d: bad id: channel free", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 242 , 1, SYSLOG_LEVEL_INFO, ((void *)0), "%d: bad id: channel free" , id); |
| 243 | return NULL((void *)0); |
| 244 | } |
| 245 | return c; |
| 246 | } |
| 247 | |
| 248 | Channel * |
| 249 | channel_by_remote_id(struct ssh *ssh, u_int remote_id) |
| 250 | { |
| 251 | Channel *c; |
| 252 | u_int i; |
| 253 | |
| 254 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 255 | c = ssh->chanctxt->channels[i]; |
| 256 | if (c != NULL((void *)0) && c->have_remote_id && c->remote_id == remote_id) |
| 257 | return c; |
| 258 | } |
| 259 | return NULL((void *)0); |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * Returns the channel if it is allowed to receive protocol messages. |
| 264 | * Private channels, like listening sockets, may not receive messages. |
| 265 | */ |
| 266 | Channel * |
| 267 | channel_lookup(struct ssh *ssh, int id) |
| 268 | { |
| 269 | Channel *c; |
| 270 | |
| 271 | if ((c = channel_by_id(ssh, id)) == NULL((void *)0)) |
| 272 | return NULL((void *)0); |
| 273 | |
| 274 | switch (c->type) { |
| 275 | case SSH_CHANNEL_X11_OPEN7: |
| 276 | case SSH_CHANNEL_LARVAL10: |
| 277 | case SSH_CHANNEL_CONNECTING12: |
| 278 | case SSH_CHANNEL_DYNAMIC13: |
| 279 | case SSH_CHANNEL_RDYNAMIC_OPEN21: |
| 280 | case SSH_CHANNEL_RDYNAMIC_FINISH22: |
| 281 | case SSH_CHANNEL_OPENING3: |
| 282 | case SSH_CHANNEL_OPEN4: |
| 283 | case SSH_CHANNEL_ABANDONED17: |
| 284 | case SSH_CHANNEL_MUX_PROXY20: |
| 285 | return c; |
| 286 | } |
| 287 | logit("Non-public channel %d, type %d.", id, c->type)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 287 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Non-public channel %d, type %d." , id, c->type); |
| 288 | return NULL((void *)0); |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Register filedescriptors for a channel, used when allocating a channel or |
| 293 | * when the channel consumer/producer is ready, e.g. shell exec'd |
| 294 | */ |
| 295 | static void |
| 296 | channel_register_fds(struct ssh *ssh, Channel *c, int rfd, int wfd, int efd, |
| 297 | int extusage, int nonblock, int is_tty) |
| 298 | { |
| 299 | if (rfd != -1) |
| 300 | fcntl(rfd, F_SETFD2, FD_CLOEXEC1); |
| 301 | if (wfd != -1 && wfd != rfd) |
| 302 | fcntl(wfd, F_SETFD2, FD_CLOEXEC1); |
| 303 | if (efd != -1 && efd != rfd && efd != wfd) |
| 304 | fcntl(efd, F_SETFD2, FD_CLOEXEC1); |
| 305 | |
| 306 | c->rfd = rfd; |
| 307 | c->wfd = wfd; |
| 308 | c->sock = (rfd == wfd) ? rfd : -1; |
| 309 | c->efd = efd; |
| 310 | c->extended_usage = extusage; |
| 311 | |
| 312 | if ((c->isatty = is_tty) != 0) |
| 313 | debug2("channel %d: rfd %d isatty", c->self, c->rfd)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 313 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: rfd %d isatty" , c->self, c->rfd); |
| 314 | |
| 315 | /* enable nonblocking mode */ |
| 316 | c->restore_block = 0; |
| 317 | if (nonblock == CHANNEL_NONBLOCK_STDIO2) { |
| 318 | /* |
| 319 | * Special handling for stdio file descriptors: do not set |
| 320 | * non-blocking mode if they are TTYs. Otherwise prepare to |
| 321 | * restore their blocking state on exit to avoid interfering |
| 322 | * with other programs that follow. |
| 323 | */ |
| 324 | if (rfd != -1 && !isatty(rfd) && fcntl(rfd, F_GETFL3) == 0) { |
| 325 | c->restore_block |= CHANNEL_RESTORE_RFD0x01; |
| 326 | set_nonblock(rfd); |
| 327 | } |
| 328 | if (wfd != -1 && !isatty(wfd) && fcntl(wfd, F_GETFL3) == 0) { |
| 329 | c->restore_block |= CHANNEL_RESTORE_WFD0x02; |
| 330 | set_nonblock(wfd); |
| 331 | } |
| 332 | if (efd != -1 && !isatty(efd) && fcntl(efd, F_GETFL3) == 0) { |
| 333 | c->restore_block |= CHANNEL_RESTORE_EFD0x04; |
| 334 | set_nonblock(efd); |
| 335 | } |
| 336 | } else if (nonblock) { |
| 337 | if (rfd != -1) |
| 338 | set_nonblock(rfd); |
| 339 | if (wfd != -1) |
| 340 | set_nonblock(wfd); |
| 341 | if (efd != -1) |
| 342 | set_nonblock(efd); |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * Allocate a new channel object and set its type and socket. This will cause |
| 348 | * remote_name to be freed. |
| 349 | */ |
| 350 | Channel * |
| 351 | channel_new(struct ssh *ssh, char *ctype, int type, int rfd, int wfd, int efd, |
| 352 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
| 353 | { |
| 354 | struct ssh_channels *sc = ssh->chanctxt; |
| 355 | u_int i, found; |
| 356 | Channel *c; |
| 357 | int r; |
| 358 | |
| 359 | /* Try to find a free slot where to put the new channel. */ |
| 360 | for (i = 0; i < sc->channels_alloc; i++) { |
| 361 | if (sc->channels[i] == NULL((void *)0)) { |
| 362 | /* Found a free slot. */ |
| 363 | found = i; |
| 364 | break; |
| 365 | } |
| 366 | } |
| 367 | if (i >= sc->channels_alloc) { |
| 368 | /* |
| 369 | * There are no free slots. Take last+1 slot and expand |
| 370 | * the array. |
| 371 | */ |
| 372 | found = sc->channels_alloc; |
| 373 | if (sc->channels_alloc > CHANNELS_MAX_CHANNELS(16*1024)) |
| 374 | fatal_f("internal error: channels_alloc %d too big",sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 375 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "internal error: channels_alloc %d too big" , sc->channels_alloc) |
| 375 | sc->channels_alloc)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 375 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "internal error: channels_alloc %d too big" , sc->channels_alloc); |
| 376 | sc->channels = xrecallocarray(sc->channels, sc->channels_alloc, |
| 377 | sc->channels_alloc + 10, sizeof(*sc->channels)); |
| 378 | sc->channels_alloc += 10; |
| 379 | debug2("channel: expanding %d", sc->channels_alloc)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 379 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel: expanding %d" , sc->channels_alloc); |
| 380 | } |
| 381 | /* Initialize and return new channel. */ |
| 382 | c = sc->channels[found] = xcalloc(1, sizeof(Channel)); |
| 383 | if ((c->input = sshbuf_new()) == NULL((void *)0) || |
| 384 | (c->output = sshbuf_new()) == NULL((void *)0) || |
| 385 | (c->extended = sshbuf_new()) == NULL((void *)0)) |
| 386 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 386 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
| 387 | if ((r = sshbuf_set_max_size(c->input, CHAN_INPUT_MAX(16*1024*1024))) != 0) |
| 388 | fatal_fr(r, "sshbuf_set_max_size")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 388 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_set_max_size"); |
| 389 | c->ostate = CHAN_OUTPUT_OPEN0; |
| 390 | c->istate = CHAN_INPUT_OPEN0; |
| 391 | channel_register_fds(ssh, c, rfd, wfd, efd, extusage, nonblock, 0); |
| 392 | c->self = found; |
| 393 | c->type = type; |
| 394 | c->ctype = ctype; |
| 395 | c->local_window = window; |
| 396 | c->local_window_max = window; |
| 397 | c->local_maxpacket = maxpack; |
| 398 | c->remote_name = xstrdup(remote_name); |
| 399 | c->ctl_chan = -1; |
| 400 | c->delayed = 1; /* prevent call to channel_post handler */ |
| 401 | TAILQ_INIT(&c->status_confirms)do { (&c->status_confirms)->tqh_first = ((void *)0) ; (&c->status_confirms)->tqh_last = &(&c-> status_confirms)->tqh_first; } while (0); |
| 402 | debug("channel %d: new [%s]", found, remote_name)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 402 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: new [%s]" , found, remote_name); |
| 403 | return c; |
| 404 | } |
| 405 | |
| 406 | int |
| 407 | channel_close_fd(struct ssh *ssh, Channel *c, int *fdp) |
| 408 | { |
| 409 | int ret, fd = *fdp; |
| 410 | |
| 411 | if (fd == -1) |
| 412 | return 0; |
| 413 | |
| 414 | if ((*fdp == c->rfd && (c->restore_block & CHANNEL_RESTORE_RFD0x01) != 0) || |
| 415 | (*fdp == c->wfd && (c->restore_block & CHANNEL_RESTORE_WFD0x02) != 0) || |
| 416 | (*fdp == c->efd && (c->restore_block & CHANNEL_RESTORE_EFD0x04) != 0)) |
| 417 | (void)fcntl(*fdp, F_SETFL4, 0); /* restore blocking */ |
| 418 | |
| 419 | if (*fdp == c->rfd) { |
| 420 | c->io_want &= ~SSH_CHAN_IO_RFD0x01; |
| 421 | c->io_ready &= ~SSH_CHAN_IO_RFD0x01; |
| 422 | c->rfd = -1; |
| 423 | } |
| 424 | if (*fdp == c->wfd) { |
| 425 | c->io_want &= ~SSH_CHAN_IO_WFD0x02; |
| 426 | c->io_ready &= ~SSH_CHAN_IO_WFD0x02; |
| 427 | c->wfd = -1; |
| 428 | } |
| 429 | if (*fdp == c->efd) { |
| 430 | c->io_want &= ~SSH_CHAN_IO_EFD(0x04|0x08); |
| 431 | c->io_ready &= ~SSH_CHAN_IO_EFD(0x04|0x08); |
| 432 | c->efd = -1; |
| 433 | } |
| 434 | if (*fdp == c->sock) { |
| 435 | c->io_want &= ~SSH_CHAN_IO_SOCK(0x10|0x20); |
| 436 | c->io_ready &= ~SSH_CHAN_IO_SOCK(0x10|0x20); |
| 437 | c->sock = -1; |
| 438 | } |
| 439 | |
| 440 | ret = close(fd); |
| 441 | *fdp = -1; /* probably redundant */ |
| 442 | return ret; |
| 443 | } |
| 444 | |
| 445 | /* Close all channel fd/socket. */ |
| 446 | static void |
| 447 | channel_close_fds(struct ssh *ssh, Channel *c) |
| 448 | { |
| 449 | int sock = c->sock, rfd = c->rfd, wfd = c->wfd, efd = c->efd; |
| 450 | |
| 451 | channel_close_fd(ssh, c, &c->sock); |
| 452 | if (rfd != sock) |
| 453 | channel_close_fd(ssh, c, &c->rfd); |
| 454 | if (wfd != sock && wfd != rfd) |
| 455 | channel_close_fd(ssh, c, &c->wfd); |
| 456 | if (efd != sock && efd != rfd && efd != wfd) |
| 457 | channel_close_fd(ssh, c, &c->efd); |
| 458 | } |
| 459 | |
| 460 | static void |
| 461 | fwd_perm_clear(struct permission *perm) |
| 462 | { |
| 463 | free(perm->host_to_connect); |
| 464 | free(perm->listen_host); |
| 465 | free(perm->listen_path); |
| 466 | memset(perm, 0, sizeof(*perm)); |
| 467 | } |
| 468 | |
| 469 | /* Returns an printable name for the specified forwarding permission list */ |
| 470 | static const char * |
| 471 | fwd_ident(int who, int where) |
| 472 | { |
| 473 | if (who == FORWARD_ADM0x100) { |
| 474 | if (where == FORWARD_LOCAL(1<<1)) |
| 475 | return "admin local"; |
| 476 | else if (where == FORWARD_REMOTE(1)) |
| 477 | return "admin remote"; |
| 478 | } else if (who == FORWARD_USER0x101) { |
| 479 | if (where == FORWARD_LOCAL(1<<1)) |
| 480 | return "user local"; |
| 481 | else if (where == FORWARD_REMOTE(1)) |
| 482 | return "user remote"; |
| 483 | } |
| 484 | fatal("Unknown forward permission list %d/%d", who, where)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 484 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Unknown forward permission list %d/%d" , who, where); |
| 485 | } |
| 486 | |
| 487 | /* Returns the forwarding permission list for the specified direction */ |
| 488 | static struct permission_set * |
| 489 | permission_set_get(struct ssh *ssh, int where) |
| 490 | { |
| 491 | struct ssh_channels *sc = ssh->chanctxt; |
| 492 | |
| 493 | switch (where) { |
| 494 | case FORWARD_LOCAL(1<<1): |
| 495 | return &sc->local_perms; |
| 496 | break; |
| 497 | case FORWARD_REMOTE(1): |
| 498 | return &sc->remote_perms; |
| 499 | break; |
| 500 | default: |
| 501 | fatal_f("invalid forwarding direction %d", where)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 501 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "invalid forwarding direction %d" , where); |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | /* Returns pointers to the specified forwarding list and its element count */ |
| 506 | static void |
| 507 | permission_set_get_array(struct ssh *ssh, int who, int where, |
| 508 | struct permission ***permpp, u_int **npermpp) |
| 509 | { |
| 510 | struct permission_set *pset = permission_set_get(ssh, where); |
| 511 | |
| 512 | switch (who) { |
| 513 | case FORWARD_USER0x101: |
| 514 | *permpp = &pset->permitted_user; |
| 515 | *npermpp = &pset->num_permitted_user; |
| 516 | break; |
| 517 | case FORWARD_ADM0x100: |
| 518 | *permpp = &pset->permitted_admin; |
| 519 | *npermpp = &pset->num_permitted_admin; |
| 520 | break; |
| 521 | default: |
| 522 | fatal_f("invalid forwarding client %d", who)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 522 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "invalid forwarding client %d" , who); |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | /* Adds an entry to the specified forwarding list */ |
| 527 | static int |
| 528 | permission_set_add(struct ssh *ssh, int who, int where, |
| 529 | const char *host_to_connect, int port_to_connect, |
| 530 | const char *listen_host, const char *listen_path, int listen_port, |
| 531 | Channel *downstream) |
| 532 | { |
| 533 | struct permission **permp; |
| 534 | u_int n, *npermp; |
| 535 | |
| 536 | permission_set_get_array(ssh, who, where, &permp, &npermp); |
| 537 | |
| 538 | if (*npermp >= INT_MAX2147483647) |
| 539 | fatal_f("%s overflow", fwd_ident(who, where))sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 539 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "%s overflow", fwd_ident (who, where)); |
| 540 | |
| 541 | *permp = xrecallocarray(*permp, *npermp, *npermp + 1, sizeof(**permp)); |
| 542 | n = (*npermp)++; |
| 543 | #define MAYBE_DUP(s) ((s == NULL((void *)0)) ? NULL((void *)0) : xstrdup(s)) |
| 544 | (*permp)[n].host_to_connect = MAYBE_DUP(host_to_connect); |
| 545 | (*permp)[n].port_to_connect = port_to_connect; |
| 546 | (*permp)[n].listen_host = MAYBE_DUP(listen_host); |
| 547 | (*permp)[n].listen_path = MAYBE_DUP(listen_path); |
| 548 | (*permp)[n].listen_port = listen_port; |
| 549 | (*permp)[n].downstream = downstream; |
| 550 | #undef MAYBE_DUP |
| 551 | return (int)n; |
| 552 | } |
| 553 | |
| 554 | static void |
| 555 | mux_remove_remote_forwardings(struct ssh *ssh, Channel *c) |
| 556 | { |
| 557 | struct ssh_channels *sc = ssh->chanctxt; |
| 558 | struct permission_set *pset = &sc->local_perms; |
| 559 | struct permission *perm; |
| 560 | int r; |
| 561 | u_int i; |
| 562 | |
| 563 | for (i = 0; i < pset->num_permitted_user; i++) { |
| 564 | perm = &pset->permitted_user[i]; |
| 565 | if (perm->downstream != c) |
| 566 | continue; |
| 567 | |
| 568 | /* cancel on the server, since mux client is gone */ |
| 569 | debug("channel %d: cleanup remote forward for %s:%u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 570 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: cleanup remote forward for %s:%u" , c->self, perm->listen_host, perm->listen_port) |
| 570 | c->self, perm->listen_host, perm->listen_port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 570 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: cleanup remote forward for %s:%u" , c->self, perm->listen_host, perm->listen_port); |
| 571 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST80)) != 0 || |
| 572 | (r = sshpkt_put_cstring(ssh, |
| 573 | "cancel-tcpip-forward")) != 0 || |
| 574 | (r = sshpkt_put_u8(ssh, 0)) != 0 || |
| 575 | (r = sshpkt_put_cstring(ssh, |
| 576 | channel_rfwd_bind_host(perm->listen_host))) != 0 || |
| 577 | (r = sshpkt_put_u32(ssh, perm->listen_port)) != 0 || |
| 578 | (r = sshpkt_send(ssh)) != 0) { |
| 579 | fatal_fr(r, "channel %i", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 579 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i", c->self ); |
| 580 | } |
| 581 | fwd_perm_clear(perm); /* unregister */ |
| 582 | } |
| 583 | } |
| 584 | |
| 585 | /* Free the channel and close its fd/socket. */ |
| 586 | void |
| 587 | channel_free(struct ssh *ssh, Channel *c) |
| 588 | { |
| 589 | struct ssh_channels *sc = ssh->chanctxt; |
| 590 | char *s; |
| 591 | u_int i, n; |
| 592 | Channel *other; |
| 593 | struct channel_confirm *cc; |
| 594 | |
| 595 | for (n = 0, i = 0; i < sc->channels_alloc; i++) { |
| 596 | if ((other = sc->channels[i]) == NULL((void *)0)) |
| 597 | continue; |
| 598 | n++; |
| 599 | /* detach from mux client and prepare for closing */ |
| 600 | if (c->type == SSH_CHANNEL_MUX_CLIENT16 && |
| 601 | other->type == SSH_CHANNEL_MUX_PROXY20 && |
| 602 | other->mux_ctx == c) { |
| 603 | other->mux_ctx = NULL((void *)0); |
| 604 | other->type = SSH_CHANNEL_OPEN4; |
| 605 | other->istate = CHAN_INPUT_CLOSED3; |
| 606 | other->ostate = CHAN_OUTPUT_CLOSED3; |
| 607 | } |
| 608 | } |
| 609 | debug("channel %d: free: %s, nchannels %u", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 610 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: free: %s, nchannels %u" , c->self, c->remote_name ? c->remote_name : "???", n ) |
| 610 | c->remote_name ? c->remote_name : "???", n)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 610 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: free: %s, nchannels %u" , c->self, c->remote_name ? c->remote_name : "???", n ); |
| 611 | |
| 612 | if (c->type == SSH_CHANNEL_MUX_CLIENT16) { |
| 613 | mux_remove_remote_forwardings(ssh, c); |
| 614 | free(c->mux_ctx); |
| 615 | c->mux_ctx = NULL((void *)0); |
| 616 | } else if (c->type == SSH_CHANNEL_MUX_LISTENER15) { |
| 617 | free(c->mux_ctx); |
| 618 | c->mux_ctx = NULL((void *)0); |
| 619 | } |
| 620 | |
| 621 | if (log_level_get() >= SYSLOG_LEVEL_DEBUG3) { |
| 622 | s = channel_open_message(ssh); |
| 623 | debug3("channel %d: status: %s", c->self, s)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 623 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: status: %s" , c->self, s); |
| 624 | free(s); |
| 625 | } |
| 626 | |
| 627 | channel_close_fds(ssh, c); |
| 628 | sshbuf_free(c->input); |
| 629 | sshbuf_free(c->output); |
| 630 | sshbuf_free(c->extended); |
| 631 | c->input = c->output = c->extended = NULL((void *)0); |
| 632 | free(c->remote_name); |
| 633 | c->remote_name = NULL((void *)0); |
| 634 | free(c->path); |
| 635 | c->path = NULL((void *)0); |
| 636 | free(c->listening_addr); |
| 637 | c->listening_addr = NULL((void *)0); |
| 638 | while ((cc = TAILQ_FIRST(&c->status_confirms)((&c->status_confirms)->tqh_first)) != NULL((void *)0)) { |
| 639 | if (cc->abandon_cb != NULL((void *)0)) |
| 640 | cc->abandon_cb(ssh, c, cc->ctx); |
| 641 | TAILQ_REMOVE(&c->status_confirms, cc, entry)do { if (((cc)->entry.tqe_next) != ((void *)0)) (cc)->entry .tqe_next->entry.tqe_prev = (cc)->entry.tqe_prev; else ( &c->status_confirms)->tqh_last = (cc)->entry.tqe_prev ; *(cc)->entry.tqe_prev = (cc)->entry.tqe_next; ; ; } while (0); |
| 642 | freezero(cc, sizeof(*cc)); |
| 643 | } |
| 644 | if (c->filter_cleanup != NULL((void *)0) && c->filter_ctx != NULL((void *)0)) |
| 645 | c->filter_cleanup(ssh, c->self, c->filter_ctx); |
| 646 | sc->channels[c->self] = NULL((void *)0); |
| 647 | freezero(c, sizeof(*c)); |
| 648 | } |
| 649 | |
| 650 | void |
| 651 | channel_free_all(struct ssh *ssh) |
| 652 | { |
| 653 | u_int i; |
| 654 | struct ssh_channels *sc = ssh->chanctxt; |
| 655 | |
| 656 | for (i = 0; i < sc->channels_alloc; i++) |
| 657 | if (sc->channels[i] != NULL((void *)0)) |
| 658 | channel_free(ssh, sc->channels[i]); |
| 659 | |
| 660 | free(sc->channels); |
| 661 | sc->channels = NULL((void *)0); |
| 662 | sc->channels_alloc = 0; |
| 663 | |
| 664 | free(sc->x11_saved_display); |
| 665 | sc->x11_saved_display = NULL((void *)0); |
| 666 | |
| 667 | free(sc->x11_saved_proto); |
| 668 | sc->x11_saved_proto = NULL((void *)0); |
| 669 | |
| 670 | free(sc->x11_saved_data); |
| 671 | sc->x11_saved_data = NULL((void *)0); |
| 672 | sc->x11_saved_data_len = 0; |
| 673 | |
| 674 | free(sc->x11_fake_data); |
| 675 | sc->x11_fake_data = NULL((void *)0); |
| 676 | sc->x11_fake_data_len = 0; |
| 677 | } |
| 678 | |
| 679 | /* |
| 680 | * Closes the sockets/fds of all channels. This is used to close extra file |
| 681 | * descriptors after a fork. |
| 682 | */ |
| 683 | void |
| 684 | channel_close_all(struct ssh *ssh) |
| 685 | { |
| 686 | u_int i; |
| 687 | |
| 688 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) |
| 689 | if (ssh->chanctxt->channels[i] != NULL((void *)0)) |
| 690 | channel_close_fds(ssh, ssh->chanctxt->channels[i]); |
| 691 | } |
| 692 | |
| 693 | /* |
| 694 | * Stop listening to channels. |
| 695 | */ |
| 696 | void |
| 697 | channel_stop_listening(struct ssh *ssh) |
| 698 | { |
| 699 | u_int i; |
| 700 | Channel *c; |
| 701 | |
| 702 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 703 | c = ssh->chanctxt->channels[i]; |
| 704 | if (c != NULL((void *)0)) { |
| 705 | switch (c->type) { |
| 706 | case SSH_CHANNEL_AUTH_SOCKET6: |
| 707 | case SSH_CHANNEL_PORT_LISTENER2: |
| 708 | case SSH_CHANNEL_RPORT_LISTENER11: |
| 709 | case SSH_CHANNEL_X11_LISTENER1: |
| 710 | case SSH_CHANNEL_UNIX_LISTENER18: |
| 711 | case SSH_CHANNEL_RUNIX_LISTENER19: |
| 712 | channel_close_fd(ssh, c, &c->sock); |
| 713 | channel_free(ssh, c); |
| 714 | break; |
| 715 | } |
| 716 | } |
| 717 | } |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * Returns true if no channel has too much buffered data, and false if one or |
| 722 | * more channel is overfull. |
| 723 | */ |
| 724 | int |
| 725 | channel_not_very_much_buffered_data(struct ssh *ssh) |
| 726 | { |
| 727 | u_int i; |
| 728 | u_int maxsize = ssh_packet_get_maxsize(ssh); |
| 729 | Channel *c; |
| 730 | |
| 731 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 732 | c = ssh->chanctxt->channels[i]; |
| 733 | if (c == NULL((void *)0) || c->type != SSH_CHANNEL_OPEN4) |
| 734 | continue; |
| 735 | if (sshbuf_len(c->output) > maxsize) { |
| 736 | debug2("channel %d: big output buffer %zu > %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 737 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: big output buffer %zu > %u" , c->self, sshbuf_len(c->output), maxsize) |
| 737 | c->self, sshbuf_len(c->output), maxsize)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 737 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: big output buffer %zu > %u" , c->self, sshbuf_len(c->output), maxsize); |
| 738 | return 0; |
| 739 | } |
| 740 | } |
| 741 | return 1; |
| 742 | } |
| 743 | |
| 744 | /* Returns true if any channel is still open. */ |
| 745 | int |
| 746 | channel_still_open(struct ssh *ssh) |
| 747 | { |
| 748 | u_int i; |
| 749 | Channel *c; |
| 750 | |
| 751 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 752 | c = ssh->chanctxt->channels[i]; |
| 753 | if (c == NULL((void *)0)) |
| 754 | continue; |
| 755 | switch (c->type) { |
| 756 | case SSH_CHANNEL_X11_LISTENER1: |
| 757 | case SSH_CHANNEL_PORT_LISTENER2: |
| 758 | case SSH_CHANNEL_RPORT_LISTENER11: |
| 759 | case SSH_CHANNEL_MUX_LISTENER15: |
| 760 | case SSH_CHANNEL_CLOSED5: |
| 761 | case SSH_CHANNEL_AUTH_SOCKET6: |
| 762 | case SSH_CHANNEL_DYNAMIC13: |
| 763 | case SSH_CHANNEL_RDYNAMIC_OPEN21: |
| 764 | case SSH_CHANNEL_CONNECTING12: |
| 765 | case SSH_CHANNEL_ZOMBIE14: |
| 766 | case SSH_CHANNEL_ABANDONED17: |
| 767 | case SSH_CHANNEL_UNIX_LISTENER18: |
| 768 | case SSH_CHANNEL_RUNIX_LISTENER19: |
| 769 | continue; |
| 770 | case SSH_CHANNEL_LARVAL10: |
| 771 | continue; |
| 772 | case SSH_CHANNEL_OPENING3: |
| 773 | case SSH_CHANNEL_OPEN4: |
| 774 | case SSH_CHANNEL_RDYNAMIC_FINISH22: |
| 775 | case SSH_CHANNEL_X11_OPEN7: |
| 776 | case SSH_CHANNEL_MUX_CLIENT16: |
| 777 | case SSH_CHANNEL_MUX_PROXY20: |
| 778 | return 1; |
| 779 | default: |
| 780 | fatal_f("bad channel type %d", c->type)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 780 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "bad channel type %d", c ->type); |
| 781 | /* NOTREACHED */ |
| 782 | } |
| 783 | } |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | /* Returns the id of an open channel suitable for keepaliving */ |
| 788 | int |
| 789 | channel_find_open(struct ssh *ssh) |
| 790 | { |
| 791 | u_int i; |
| 792 | Channel *c; |
| 793 | |
| 794 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 795 | c = ssh->chanctxt->channels[i]; |
| 796 | if (c == NULL((void *)0) || !c->have_remote_id) |
| 797 | continue; |
| 798 | switch (c->type) { |
| 799 | case SSH_CHANNEL_CLOSED5: |
| 800 | case SSH_CHANNEL_DYNAMIC13: |
| 801 | case SSH_CHANNEL_RDYNAMIC_OPEN21: |
| 802 | case SSH_CHANNEL_RDYNAMIC_FINISH22: |
| 803 | case SSH_CHANNEL_X11_LISTENER1: |
| 804 | case SSH_CHANNEL_PORT_LISTENER2: |
| 805 | case SSH_CHANNEL_RPORT_LISTENER11: |
| 806 | case SSH_CHANNEL_MUX_LISTENER15: |
| 807 | case SSH_CHANNEL_MUX_CLIENT16: |
| 808 | case SSH_CHANNEL_MUX_PROXY20: |
| 809 | case SSH_CHANNEL_OPENING3: |
| 810 | case SSH_CHANNEL_CONNECTING12: |
| 811 | case SSH_CHANNEL_ZOMBIE14: |
| 812 | case SSH_CHANNEL_ABANDONED17: |
| 813 | case SSH_CHANNEL_UNIX_LISTENER18: |
| 814 | case SSH_CHANNEL_RUNIX_LISTENER19: |
| 815 | continue; |
| 816 | case SSH_CHANNEL_LARVAL10: |
| 817 | case SSH_CHANNEL_AUTH_SOCKET6: |
| 818 | case SSH_CHANNEL_OPEN4: |
| 819 | case SSH_CHANNEL_X11_OPEN7: |
| 820 | return i; |
| 821 | default: |
| 822 | fatal_f("bad channel type %d", c->type)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 822 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "bad channel type %d", c ->type); |
| 823 | /* NOTREACHED */ |
| 824 | } |
| 825 | } |
| 826 | return -1; |
| 827 | } |
| 828 | |
| 829 | /* Returns the state of the channel's extended usage flag */ |
| 830 | const char * |
| 831 | channel_format_extended_usage(const Channel *c) |
| 832 | { |
| 833 | if (c->efd == -1) |
| 834 | return "closed"; |
| 835 | |
| 836 | switch (c->extended_usage) { |
| 837 | case CHAN_EXTENDED_WRITE2: |
| 838 | return "write"; |
| 839 | case CHAN_EXTENDED_READ1: |
| 840 | return "read"; |
| 841 | case CHAN_EXTENDED_IGNORE0: |
| 842 | return "ignore"; |
| 843 | default: |
| 844 | return "UNKNOWN"; |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | static char * |
| 849 | channel_format_status(const Channel *c) |
| 850 | { |
| 851 | char *ret = NULL((void *)0); |
| 852 | |
| 853 | xasprintf(&ret, "t%d %s%u i%u/%zu o%u/%zu e[%s]/%zu " |
| 854 | "fd %d/%d/%d sock %d cc %d io 0x%02x/0x%02x", |
| 855 | c->type, |
| 856 | c->have_remote_id ? "r" : "nr", c->remote_id, |
| 857 | c->istate, sshbuf_len(c->input), |
| 858 | c->ostate, sshbuf_len(c->output), |
| 859 | channel_format_extended_usage(c), sshbuf_len(c->extended), |
| 860 | c->rfd, c->wfd, c->efd, c->sock, c->ctl_chan, |
| 861 | c->io_want, c->io_ready); |
| 862 | return ret; |
| 863 | } |
| 864 | |
| 865 | /* |
| 866 | * Returns a message describing the currently open forwarded connections, |
| 867 | * suitable for sending to the client. The message contains crlf pairs for |
| 868 | * newlines. |
| 869 | */ |
| 870 | char * |
| 871 | channel_open_message(struct ssh *ssh) |
| 872 | { |
| 873 | struct sshbuf *buf; |
| 874 | Channel *c; |
| 875 | u_int i; |
| 876 | int r; |
| 877 | char *cp, *ret; |
| 878 | |
| 879 | if ((buf = sshbuf_new()) == NULL((void *)0)) |
| 880 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 880 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 881 | if ((r = sshbuf_putf(buf, |
| 882 | "The following connections are open:\r\n")) != 0) |
| 883 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 883 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 884 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 885 | c = ssh->chanctxt->channels[i]; |
| 886 | if (c == NULL((void *)0)) |
| 887 | continue; |
| 888 | switch (c->type) { |
| 889 | case SSH_CHANNEL_X11_LISTENER1: |
| 890 | case SSH_CHANNEL_PORT_LISTENER2: |
| 891 | case SSH_CHANNEL_RPORT_LISTENER11: |
| 892 | case SSH_CHANNEL_CLOSED5: |
| 893 | case SSH_CHANNEL_AUTH_SOCKET6: |
| 894 | case SSH_CHANNEL_ZOMBIE14: |
| 895 | case SSH_CHANNEL_ABANDONED17: |
| 896 | case SSH_CHANNEL_MUX_LISTENER15: |
| 897 | case SSH_CHANNEL_UNIX_LISTENER18: |
| 898 | case SSH_CHANNEL_RUNIX_LISTENER19: |
| 899 | continue; |
| 900 | case SSH_CHANNEL_LARVAL10: |
| 901 | case SSH_CHANNEL_OPENING3: |
| 902 | case SSH_CHANNEL_CONNECTING12: |
| 903 | case SSH_CHANNEL_DYNAMIC13: |
| 904 | case SSH_CHANNEL_RDYNAMIC_OPEN21: |
| 905 | case SSH_CHANNEL_RDYNAMIC_FINISH22: |
| 906 | case SSH_CHANNEL_OPEN4: |
| 907 | case SSH_CHANNEL_X11_OPEN7: |
| 908 | case SSH_CHANNEL_MUX_PROXY20: |
| 909 | case SSH_CHANNEL_MUX_CLIENT16: |
| 910 | cp = channel_format_status(c); |
| 911 | if ((r = sshbuf_putf(buf, " #%d %.300s (%s)\r\n", |
| 912 | c->self, c->remote_name, cp)) != 0) { |
| 913 | free(cp); |
| 914 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 914 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 915 | } |
| 916 | free(cp); |
| 917 | continue; |
| 918 | default: |
| 919 | fatal_f("bad channel type %d", c->type)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 919 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "bad channel type %d", c ->type); |
| 920 | /* NOTREACHED */ |
| 921 | } |
| 922 | } |
| 923 | if ((ret = sshbuf_dup_string(buf)) == NULL((void *)0)) |
| 924 | fatal_f("sshbuf_dup_string")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 924 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_dup_string"); |
| 925 | sshbuf_free(buf); |
| 926 | return ret; |
| 927 | } |
| 928 | |
| 929 | static void |
| 930 | open_preamble(struct ssh *ssh, const char *where, Channel *c, const char *type) |
| 931 | { |
| 932 | int r; |
| 933 | |
| 934 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN90)) != 0 || |
| 935 | (r = sshpkt_put_cstring(ssh, type)) != 0 || |
| 936 | (r = sshpkt_put_u32(ssh, c->self)) != 0 || |
| 937 | (r = sshpkt_put_u32(ssh, c->local_window)) != 0 || |
| 938 | (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0) { |
| 939 | fatal_r(r, "%s: channel %i: open", where, c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 939 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "%s: channel %i: open", where , c->self); |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | void |
| 944 | channel_send_open(struct ssh *ssh, int id) |
| 945 | { |
| 946 | Channel *c = channel_lookup(ssh, id); |
| 947 | int r; |
| 948 | |
| 949 | if (c == NULL((void *)0)) { |
| 950 | logit("channel_send_open: %d: bad id", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 950 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel_send_open: %d: bad id" , id); |
| 951 | return; |
| 952 | } |
| 953 | debug2("channel %d: send open", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 953 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: send open" , id); |
| 954 | open_preamble(ssh, __func__, c, c->ctype); |
| 955 | if ((r = sshpkt_send(ssh)) != 0) |
| 956 | fatal_fr(r, "channel %i", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 956 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i", c->self ); |
| 957 | } |
| 958 | |
| 959 | void |
| 960 | channel_request_start(struct ssh *ssh, int id, char *service, int wantconfirm) |
| 961 | { |
| 962 | Channel *c = channel_lookup(ssh, id); |
| 963 | int r; |
| 964 | |
| 965 | if (c == NULL((void *)0)) { |
| 966 | logit_f("%d: unknown channel id", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 966 , 1, SYSLOG_LEVEL_INFO, ((void *)0), "%d: unknown channel id" , id); |
| 967 | return; |
| 968 | } |
| 969 | if (!c->have_remote_id) |
| 970 | fatal_f("channel %d: no remote id", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 970 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: no remote id" , c->self); |
| 971 | |
| 972 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 972 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: request %s confirm %d" , id, service, wantconfirm); |
| 973 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_REQUEST98)) != 0 || |
| 974 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 975 | (r = sshpkt_put_cstring(ssh, service)) != 0 || |
| 976 | (r = sshpkt_put_u8(ssh, wantconfirm)) != 0) { |
| 977 | fatal_fr(r, "channel %i", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 977 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i", c->self ); |
| 978 | } |
| 979 | } |
| 980 | |
| 981 | void |
| 982 | channel_register_status_confirm(struct ssh *ssh, int id, |
| 983 | channel_confirm_cb *cb, channel_confirm_abandon_cb *abandon_cb, void *ctx) |
| 984 | { |
| 985 | struct channel_confirm *cc; |
| 986 | Channel *c; |
| 987 | |
| 988 | if ((c = channel_lookup(ssh, id)) == NULL((void *)0)) |
| 989 | fatal_f("%d: bad id", id)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 989 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "%d: bad id", id); |
| 990 | |
| 991 | cc = xcalloc(1, sizeof(*cc)); |
| 992 | cc->cb = cb; |
| 993 | cc->abandon_cb = abandon_cb; |
| 994 | cc->ctx = ctx; |
| 995 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry)do { (cc)->entry.tqe_next = ((void *)0); (cc)->entry.tqe_prev = (&c->status_confirms)->tqh_last; *(&c->status_confirms )->tqh_last = (cc); (&c->status_confirms)->tqh_last = &(cc)->entry.tqe_next; } while (0); |
| 996 | } |
| 997 | |
| 998 | void |
| 999 | channel_register_open_confirm(struct ssh *ssh, int id, |
| 1000 | channel_open_fn *fn, void *ctx) |
| 1001 | { |
| 1002 | Channel *c = channel_lookup(ssh, id); |
| 1003 | |
| 1004 | if (c == NULL((void *)0)) { |
| 1005 | logit_f("%d: bad id", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1005 , 1, SYSLOG_LEVEL_INFO, ((void *)0), "%d: bad id", id); |
| 1006 | return; |
| 1007 | } |
| 1008 | c->open_confirm = fn; |
| 1009 | c->open_confirm_ctx = ctx; |
| 1010 | } |
| 1011 | |
| 1012 | void |
| 1013 | channel_register_cleanup(struct ssh *ssh, int id, |
| 1014 | channel_callback_fn *fn, int do_close) |
| 1015 | { |
| 1016 | Channel *c = channel_by_id(ssh, id); |
| 1017 | |
| 1018 | if (c == NULL((void *)0)) { |
| 1019 | logit_f("%d: bad id", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1019 , 1, SYSLOG_LEVEL_INFO, ((void *)0), "%d: bad id", id); |
| 1020 | return; |
| 1021 | } |
| 1022 | c->detach_user = fn; |
| 1023 | c->detach_close = do_close; |
| 1024 | } |
| 1025 | |
| 1026 | void |
| 1027 | channel_cancel_cleanup(struct ssh *ssh, int id) |
| 1028 | { |
| 1029 | Channel *c = channel_by_id(ssh, id); |
| 1030 | |
| 1031 | if (c == NULL((void *)0)) { |
| 1032 | logit_f("%d: bad id", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1032 , 1, SYSLOG_LEVEL_INFO, ((void *)0), "%d: bad id", id); |
| 1033 | return; |
| 1034 | } |
| 1035 | c->detach_user = NULL((void *)0); |
| 1036 | c->detach_close = 0; |
| 1037 | } |
| 1038 | |
| 1039 | void |
| 1040 | channel_register_filter(struct ssh *ssh, int id, channel_infilter_fn *ifn, |
| 1041 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
| 1042 | { |
| 1043 | Channel *c = channel_lookup(ssh, id); |
| 1044 | |
| 1045 | if (c == NULL((void *)0)) { |
| 1046 | logit_f("%d: bad id", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1046 , 1, SYSLOG_LEVEL_INFO, ((void *)0), "%d: bad id", id); |
| 1047 | return; |
| 1048 | } |
| 1049 | c->input_filter = ifn; |
| 1050 | c->output_filter = ofn; |
| 1051 | c->filter_ctx = ctx; |
| 1052 | c->filter_cleanup = cfn; |
| 1053 | } |
| 1054 | |
| 1055 | void |
| 1056 | channel_set_fds(struct ssh *ssh, int id, int rfd, int wfd, int efd, |
| 1057 | int extusage, int nonblock, int is_tty, u_int window_max) |
| 1058 | { |
| 1059 | Channel *c = channel_lookup(ssh, id); |
| 1060 | int r; |
| 1061 | |
| 1062 | if (c == NULL((void *)0) || c->type != SSH_CHANNEL_LARVAL10) |
| 1063 | fatal("channel_activate for non-larval channel %d.", id)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1063 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "channel_activate for non-larval channel %d." , id); |
| 1064 | if (!c->have_remote_id) |
| 1065 | fatal_f("channel %d: no remote id", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1065 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: no remote id" , c->self); |
| 1066 | |
| 1067 | channel_register_fds(ssh, c, rfd, wfd, efd, extusage, nonblock, is_tty); |
| 1068 | c->type = SSH_CHANNEL_OPEN4; |
| 1069 | c->local_window = c->local_window_max = window_max; |
| 1070 | |
| 1071 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST93)) != 0 || |
| 1072 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 1073 | (r = sshpkt_put_u32(ssh, c->local_window)) != 0 || |
| 1074 | (r = sshpkt_send(ssh)) != 0) |
| 1075 | fatal_fr(r, "channel %i", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1075 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i", c->self ); |
| 1076 | } |
| 1077 | |
| 1078 | static void |
| 1079 | channel_pre_listener(struct ssh *ssh, Channel *c) |
| 1080 | { |
| 1081 | c->io_want = SSH_CHAN_IO_SOCK_R0x10; |
| 1082 | } |
| 1083 | |
| 1084 | static void |
| 1085 | channel_pre_connecting(struct ssh *ssh, Channel *c) |
| 1086 | { |
| 1087 | debug3("channel %d: waiting for connection", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1087 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: waiting for connection" , c->self); |
| 1088 | c->io_want = SSH_CHAN_IO_SOCK_W0x20; |
| 1089 | } |
| 1090 | |
| 1091 | static void |
| 1092 | channel_pre_open(struct ssh *ssh, Channel *c) |
| 1093 | { |
| 1094 | c->io_want = 0; |
| 1095 | if (c->istate == CHAN_INPUT_OPEN0 && |
| 1096 | c->remote_window > 0 && |
| 1097 | sshbuf_len(c->input) < c->remote_window && |
| 1098 | sshbuf_check_reserve(c->input, CHAN_RBUF(16*1024)) == 0) |
| 1099 | c->io_want |= SSH_CHAN_IO_RFD0x01; |
| 1100 | if (c->ostate == CHAN_OUTPUT_OPEN0 || |
| 1101 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN1) { |
| 1102 | if (sshbuf_len(c->output) > 0) { |
| 1103 | c->io_want |= SSH_CHAN_IO_WFD0x02; |
| 1104 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN1) { |
| 1105 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)(c->extended_usage == 2 && c->efd != -1 && (!(c->flags & (0x08|0x02)) || sshbuf_len(c->extended ) > 0))) |
| 1106 | debug2("channel %d: "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1108 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: " "obuf_empty delayed efd %d/(%zu)" , c->self, c->efd, sshbuf_len(c->extended)) |
| 1107 | "obuf_empty delayed efd %d/(%zu)", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1108 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: " "obuf_empty delayed efd %d/(%zu)" , c->self, c->efd, sshbuf_len(c->extended)) |
| 1108 | c->efd, sshbuf_len(c->extended))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1108 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: " "obuf_empty delayed efd %d/(%zu)" , c->self, c->efd, sshbuf_len(c->extended)); |
| 1109 | else |
| 1110 | chan_obuf_empty(ssh, c); |
| 1111 | } |
| 1112 | } |
| 1113 | /** XXX check close conditions, too */ |
| 1114 | if (c->efd != -1 && !(c->istate == CHAN_INPUT_CLOSED3 && |
| 1115 | c->ostate == CHAN_OUTPUT_CLOSED3)) { |
| 1116 | if (c->extended_usage == CHAN_EXTENDED_WRITE2 && |
| 1117 | sshbuf_len(c->extended) > 0) |
| 1118 | c->io_want |= SSH_CHAN_IO_EFD_W0x08; |
| 1119 | else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT0x04) && |
| 1120 | (c->extended_usage == CHAN_EXTENDED_READ1 || |
| 1121 | c->extended_usage == CHAN_EXTENDED_IGNORE0) && |
| 1122 | sshbuf_len(c->extended) < c->remote_window) |
| 1123 | c->io_want |= SSH_CHAN_IO_EFD_R0x04; |
| 1124 | } |
| 1125 | /* XXX: What about efd? races? */ |
| 1126 | } |
| 1127 | |
| 1128 | /* |
| 1129 | * This is a special state for X11 authentication spoofing. An opened X11 |
| 1130 | * connection (when authentication spoofing is being done) remains in this |
| 1131 | * state until the first packet has been completely read. The authentication |
| 1132 | * data in that packet is then substituted by the real data if it matches the |
| 1133 | * fake data, and the channel is put into normal mode. |
| 1134 | * XXX All this happens at the client side. |
| 1135 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
| 1136 | */ |
| 1137 | static int |
| 1138 | x11_open_helper(struct ssh *ssh, struct sshbuf *b) |
| 1139 | { |
| 1140 | struct ssh_channels *sc = ssh->chanctxt; |
| 1141 | u_char *ucp; |
| 1142 | u_int proto_len, data_len; |
| 1143 | |
| 1144 | /* Is this being called after the refusal deadline? */ |
| 1145 | if (sc->x11_refuse_time != 0 && |
| 1146 | (u_int)monotime() >= sc->x11_refuse_time) { |
| 1147 | verbose("Rejected X11 connection after ForwardX11Timeout "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1148 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Rejected X11 connection after ForwardX11Timeout " "expired") |
| 1148 | "expired")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1148 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Rejected X11 connection after ForwardX11Timeout " "expired"); |
| 1149 | return -1; |
| 1150 | } |
| 1151 | |
| 1152 | /* Check if the fixed size part of the packet is in buffer. */ |
| 1153 | if (sshbuf_len(b) < 12) |
| 1154 | return 0; |
| 1155 | |
| 1156 | /* Parse the lengths of variable-length fields. */ |
| 1157 | ucp = sshbuf_mutable_ptr(b); |
| 1158 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
| 1159 | proto_len = 256 * ucp[6] + ucp[7]; |
| 1160 | data_len = 256 * ucp[8] + ucp[9]; |
| 1161 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ |
| 1162 | proto_len = ucp[6] + 256 * ucp[7]; |
| 1163 | data_len = ucp[8] + 256 * ucp[9]; |
| 1164 | } else { |
| 1165 | debug2("Initial X11 packet contains bad byte order byte: 0x%x",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1166 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "Initial X11 packet contains bad byte order byte: 0x%x" , ucp[0]) |
| 1166 | ucp[0])sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1166 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "Initial X11 packet contains bad byte order byte: 0x%x" , ucp[0]); |
| 1167 | return -1; |
| 1168 | } |
| 1169 | |
| 1170 | /* Check if the whole packet is in buffer. */ |
| 1171 | if (sshbuf_len(b) < |
| 1172 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
| 1173 | return 0; |
| 1174 | |
| 1175 | /* Check if authentication protocol matches. */ |
| 1176 | if (proto_len != strlen(sc->x11_saved_proto) || |
| 1177 | memcmp(ucp + 12, sc->x11_saved_proto, proto_len) != 0) { |
| 1178 | debug2("X11 connection uses different authentication protocol.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1178 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "X11 connection uses different authentication protocol." ); |
| 1179 | return -1; |
| 1180 | } |
| 1181 | /* Check if authentication data matches our fake data. */ |
| 1182 | if (data_len != sc->x11_fake_data_len || |
| 1183 | timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3), |
| 1184 | sc->x11_fake_data, sc->x11_fake_data_len) != 0) { |
| 1185 | debug2("X11 auth data does not match fake data.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1185 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "X11 auth data does not match fake data." ); |
| 1186 | return -1; |
| 1187 | } |
| 1188 | /* Check fake data length */ |
| 1189 | if (sc->x11_fake_data_len != sc->x11_saved_data_len) { |
| 1190 | error("X11 fake_data_len %d != saved_data_len %d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1191 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "X11 fake_data_len %d != saved_data_len %d" , sc->x11_fake_data_len, sc->x11_saved_data_len) |
| 1191 | sc->x11_fake_data_len, sc->x11_saved_data_len)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1191 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "X11 fake_data_len %d != saved_data_len %d" , sc->x11_fake_data_len, sc->x11_saved_data_len); |
| 1192 | return -1; |
| 1193 | } |
| 1194 | /* |
| 1195 | * Received authentication protocol and data match |
| 1196 | * our fake data. Substitute the fake data with real |
| 1197 | * data. |
| 1198 | */ |
| 1199 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), |
| 1200 | sc->x11_saved_data, sc->x11_saved_data_len); |
| 1201 | return 1; |
| 1202 | } |
| 1203 | |
| 1204 | static void |
| 1205 | channel_pre_x11_open(struct ssh *ssh, Channel *c) |
| 1206 | { |
| 1207 | int ret = x11_open_helper(ssh, c->output); |
| 1208 | |
| 1209 | /* c->force_drain = 1; */ |
| 1210 | |
| 1211 | if (ret == 1) { |
| 1212 | c->type = SSH_CHANNEL_OPEN4; |
| 1213 | channel_pre_open(ssh, c); |
| 1214 | } else if (ret == -1) { |
| 1215 | logit("X11 connection rejected because of wrong authentication.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1215 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "X11 connection rejected because of wrong authentication." ); |
| 1216 | debug2("X11 rejected %d i%d/o%d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1217 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "X11 rejected %d i%d/o%d" , c->self, c->istate, c->ostate) |
| 1217 | c->self, c->istate, c->ostate)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1217 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "X11 rejected %d i%d/o%d" , c->self, c->istate, c->ostate); |
| 1218 | chan_read_failed(ssh, c); |
| 1219 | sshbuf_reset(c->input); |
| 1220 | chan_ibuf_empty(ssh, c); |
| 1221 | sshbuf_reset(c->output); |
| 1222 | chan_write_failed(ssh, c); |
| 1223 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1223 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "X11 closed %d i%d/o%d" , c->self, c->istate, c->ostate); |
| 1224 | } |
| 1225 | } |
| 1226 | |
| 1227 | static void |
| 1228 | channel_pre_mux_client(struct ssh *ssh, Channel *c) |
| 1229 | { |
| 1230 | c->io_want = 0; |
| 1231 | if (c->istate == CHAN_INPUT_OPEN0 && !c->mux_pause && |
| 1232 | sshbuf_check_reserve(c->input, CHAN_RBUF(16*1024)) == 0) |
| 1233 | c->io_want |= SSH_CHAN_IO_RFD0x01; |
| 1234 | if (c->istate == CHAN_INPUT_WAIT_DRAIN1) { |
| 1235 | /* clear buffer immediately (discard any partial packet) */ |
| 1236 | sshbuf_reset(c->input); |
| 1237 | chan_ibuf_empty(ssh, c); |
| 1238 | /* Start output drain. XXX just kill chan? */ |
| 1239 | chan_rcvd_oclose(ssh, c); |
| 1240 | } |
| 1241 | if (c->ostate == CHAN_OUTPUT_OPEN0 || |
| 1242 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN1) { |
| 1243 | if (sshbuf_len(c->output) > 0) |
| 1244 | c->io_want |= SSH_CHAN_IO_WFD0x02; |
| 1245 | else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN1) |
| 1246 | chan_obuf_empty(ssh, c); |
| 1247 | } |
| 1248 | } |
| 1249 | |
| 1250 | /* try to decode a socks4 header */ |
| 1251 | static int |
| 1252 | channel_decode_socks4(Channel *c, struct sshbuf *input, struct sshbuf *output) |
| 1253 | { |
| 1254 | const u_char *p; |
| 1255 | char *host; |
| 1256 | u_int len, have, i, found, need; |
| 1257 | char username[256]; |
| 1258 | struct { |
| 1259 | u_int8_t version; |
| 1260 | u_int8_t command; |
| 1261 | u_int16_t dest_port; |
| 1262 | struct in_addr dest_addr; |
| 1263 | } s4_req, s4_rsp; |
| 1264 | int r; |
| 1265 | |
| 1266 | debug2("channel %d: decode socks4", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1266 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: decode socks4" , c->self); |
| 1267 | |
| 1268 | have = sshbuf_len(input); |
| 1269 | len = sizeof(s4_req); |
| 1270 | if (have < len) |
| 1271 | return 0; |
| 1272 | p = sshbuf_ptr(input); |
| 1273 | |
| 1274 | need = 1; |
| 1275 | /* SOCKS4A uses an invalid IP address 0.0.0.x */ |
| 1276 | if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { |
| 1277 | debug2("channel %d: socks4a request", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1277 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: socks4a request" , c->self); |
| 1278 | /* ... and needs an extra string (the hostname) */ |
| 1279 | need = 2; |
| 1280 | } |
| 1281 | /* Check for terminating NUL on the string(s) */ |
| 1282 | for (found = 0, i = len; i < have; i++) { |
| 1283 | if (p[i] == '\0') { |
| 1284 | found++; |
| 1285 | if (found == need) |
| 1286 | break; |
| 1287 | } |
| 1288 | if (i > 1024) { |
| 1289 | /* the peer is probably sending garbage */ |
| 1290 | debug("channel %d: decode socks4: too long",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1291 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: decode socks4: too long" , c->self) |
| 1291 | c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1291 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: decode socks4: too long" , c->self); |
| 1292 | return -1; |
| 1293 | } |
| 1294 | } |
| 1295 | if (found < need) |
| 1296 | return 0; |
| 1297 | if ((r = sshbuf_get(input, &s4_req.version, 1)) != 0 || |
| 1298 | (r = sshbuf_get(input, &s4_req.command, 1)) != 0 || |
| 1299 | (r = sshbuf_get(input, &s4_req.dest_port, 2)) != 0 || |
| 1300 | (r = sshbuf_get(input, &s4_req.dest_addr, 4)) != 0) { |
| 1301 | debug_r(r, "channels %d: decode socks4", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1301 , 0, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "channels %d: decode socks4" , c->self); |
| 1302 | return -1; |
| 1303 | } |
| 1304 | have = sshbuf_len(input); |
| 1305 | p = sshbuf_ptr(input); |
| 1306 | if (memchr(p, '\0', have) == NULL((void *)0)) { |
| 1307 | error("channel %d: decode socks4: unterminated user", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1307 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "channel %d: decode socks4: unterminated user" , c->self); |
| 1308 | return -1; |
| 1309 | } |
| 1310 | len = strlen(p); |
| 1311 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1311 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: decode socks4: user %s/%d" , c->self, p, len); |
| 1312 | len++; /* trailing '\0' */ |
| 1313 | strlcpy(username, p, sizeof(username)); |
| 1314 | if ((r = sshbuf_consume(input, len)) != 0) |
| 1315 | fatal_fr(r, "channel %d: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1315 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: consume", c ->self); |
| 1316 | free(c->path); |
| 1317 | c->path = NULL((void *)0); |
| 1318 | if (need == 1) { /* SOCKS4: one string */ |
| 1319 | host = inet_ntoa(s4_req.dest_addr); |
| 1320 | c->path = xstrdup(host); |
| 1321 | } else { /* SOCKS4A: two strings */ |
| 1322 | have = sshbuf_len(input); |
| 1323 | p = sshbuf_ptr(input); |
| 1324 | if (memchr(p, '\0', have) == NULL((void *)0)) { |
| 1325 | error("channel %d: decode socks4a: host not nul "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1326 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "channel %d: decode socks4a: host not nul " "terminated", c->self) |
| 1326 | "terminated", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1326 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "channel %d: decode socks4a: host not nul " "terminated", c->self); |
| 1327 | return -1; |
| 1328 | } |
| 1329 | len = strlen(p); |
| 1330 | debug2("channel %d: decode socks4a: host %s/%d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1331 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: decode socks4a: host %s/%d" , c->self, p, len) |
| 1331 | c->self, p, len)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1331 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: decode socks4a: host %s/%d" , c->self, p, len); |
| 1332 | len++; /* trailing '\0' */ |
| 1333 | if (len > NI_MAXHOST256) { |
| 1334 | error("channel %d: hostname \"%.100s\" too long",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1335 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "channel %d: hostname \"%.100s\" too long" , c->self, p) |
| 1335 | c->self, p)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1335 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "channel %d: hostname \"%.100s\" too long" , c->self, p); |
| 1336 | return -1; |
| 1337 | } |
| 1338 | c->path = xstrdup(p); |
| 1339 | if ((r = sshbuf_consume(input, len)) != 0) |
| 1340 | fatal_fr(r, "channel %d: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1340 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: consume", c ->self); |
| 1341 | } |
| 1342 | c->host_port = ntohs(s4_req.dest_port)(__uint16_t)(__builtin_constant_p(s4_req.dest_port) ? (__uint16_t )(((__uint16_t)(s4_req.dest_port) & 0xffU) << 8 | ( (__uint16_t)(s4_req.dest_port) & 0xff00U) >> 8) : __swap16md (s4_req.dest_port)); |
| 1343 | |
| 1344 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1345 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: dynamic request: socks4 host %s port %u command %u" , c->self, c->path, c->host_port, s4_req.command) |
| 1345 | c->self, c->path, c->host_port, s4_req.command)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1345 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: dynamic request: socks4 host %s port %u command %u" , c->self, c->path, c->host_port, s4_req.command); |
| 1346 | |
| 1347 | if (s4_req.command != 1) { |
| 1348 | debug("channel %d: cannot handle: %s cn %d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1349 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: cannot handle: %s cn %d" , c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command ) |
| 1349 | c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1349 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: cannot handle: %s cn %d" , c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command ); |
| 1350 | return -1; |
| 1351 | } |
| 1352 | s4_rsp.version = 0; /* vn: 0 for reply */ |
| 1353 | s4_rsp.command = 90; /* cd: req granted */ |
| 1354 | s4_rsp.dest_port = 0; /* ignored */ |
| 1355 | s4_rsp.dest_addr.s_addr = INADDR_ANY((u_int32_t)(0x00000000)); /* ignored */ |
| 1356 | if ((r = sshbuf_put(output, &s4_rsp, sizeof(s4_rsp))) != 0) |
| 1357 | fatal_fr(r, "channel %d: append reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1357 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: append reply" , c->self); |
| 1358 | return 1; |
| 1359 | } |
| 1360 | |
| 1361 | /* try to decode a socks5 header */ |
| 1362 | #define SSH_SOCKS5_AUTHDONE0x1000 0x1000 |
| 1363 | #define SSH_SOCKS5_NOAUTH0x00 0x00 |
| 1364 | #define SSH_SOCKS5_IPV40x01 0x01 |
| 1365 | #define SSH_SOCKS5_DOMAIN0x03 0x03 |
| 1366 | #define SSH_SOCKS5_IPV60x04 0x04 |
| 1367 | #define SSH_SOCKS5_CONNECT0x01 0x01 |
| 1368 | #define SSH_SOCKS5_SUCCESS0x00 0x00 |
| 1369 | |
| 1370 | static int |
| 1371 | channel_decode_socks5(Channel *c, struct sshbuf *input, struct sshbuf *output) |
| 1372 | { |
| 1373 | /* XXX use get/put_u8 instead of trusting struct padding */ |
| 1374 | struct { |
| 1375 | u_int8_t version; |
| 1376 | u_int8_t command; |
| 1377 | u_int8_t reserved; |
| 1378 | u_int8_t atyp; |
| 1379 | } s5_req, s5_rsp; |
| 1380 | u_int16_t dest_port; |
| 1381 | char dest_addr[255+1], ntop[INET6_ADDRSTRLEN46]; |
| 1382 | const u_char *p; |
| 1383 | u_int have, need, i, found, nmethods, addrlen, af; |
| 1384 | int r; |
| 1385 | |
| 1386 | debug2("channel %d: decode socks5", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1386 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: decode socks5" , c->self); |
| 1387 | p = sshbuf_ptr(input); |
| 1388 | if (p[0] != 0x05) |
| 1389 | return -1; |
| 1390 | have = sshbuf_len(input); |
| 1391 | if (!(c->flags & SSH_SOCKS5_AUTHDONE0x1000)) { |
| 1392 | /* format: ver | nmethods | methods */ |
| 1393 | if (have < 2) |
| 1394 | return 0; |
| 1395 | nmethods = p[1]; |
| 1396 | if (have < nmethods + 2) |
| 1397 | return 0; |
| 1398 | /* look for method: "NO AUTHENTICATION REQUIRED" */ |
| 1399 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
| 1400 | if (p[i] == SSH_SOCKS5_NOAUTH0x00) { |
| 1401 | found = 1; |
| 1402 | break; |
| 1403 | } |
| 1404 | } |
| 1405 | if (!found) { |
| 1406 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1407 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: method SSH_SOCKS5_NOAUTH not found" , c->self) |
| 1407 | c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1407 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: method SSH_SOCKS5_NOAUTH not found" , c->self); |
| 1408 | return -1; |
| 1409 | } |
| 1410 | if ((r = sshbuf_consume(input, nmethods + 2)) != 0) |
| 1411 | fatal_fr(r, "channel %d: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1411 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: consume", c ->self); |
| 1412 | /* version, method */ |
| 1413 | if ((r = sshbuf_put_u8(output, 0x05)) != 0 || |
| 1414 | (r = sshbuf_put_u8(output, SSH_SOCKS5_NOAUTH0x00)) != 0) |
| 1415 | fatal_fr(r, "channel %d: append reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1415 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: append reply" , c->self); |
| 1416 | c->flags |= SSH_SOCKS5_AUTHDONE0x1000; |
| 1417 | debug2("channel %d: socks5 auth done", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1417 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: socks5 auth done" , c->self); |
| 1418 | return 0; /* need more */ |
| 1419 | } |
| 1420 | debug2("channel %d: socks5 post auth", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1420 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: socks5 post auth" , c->self); |
| 1421 | if (have < sizeof(s5_req)+1) |
| 1422 | return 0; /* need more */ |
| 1423 | memcpy(&s5_req, p, sizeof(s5_req)); |
| 1424 | if (s5_req.version != 0x05 || |
| 1425 | s5_req.command != SSH_SOCKS5_CONNECT0x01 || |
| 1426 | s5_req.reserved != 0x00) { |
| 1427 | debug2("channel %d: only socks5 connect supported", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1427 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: only socks5 connect supported" , c->self); |
| 1428 | return -1; |
| 1429 | } |
| 1430 | switch (s5_req.atyp){ |
| 1431 | case SSH_SOCKS5_IPV40x01: |
| 1432 | addrlen = 4; |
| 1433 | af = AF_INET2; |
| 1434 | break; |
| 1435 | case SSH_SOCKS5_DOMAIN0x03: |
| 1436 | addrlen = p[sizeof(s5_req)]; |
| 1437 | af = -1; |
| 1438 | break; |
| 1439 | case SSH_SOCKS5_IPV60x04: |
| 1440 | addrlen = 16; |
| 1441 | af = AF_INET624; |
| 1442 | break; |
| 1443 | default: |
| 1444 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1444 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: bad socks5 atyp %d" , c->self, s5_req.atyp); |
| 1445 | return -1; |
| 1446 | } |
| 1447 | need = sizeof(s5_req) + addrlen + 2; |
| 1448 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN0x03) |
| 1449 | need++; |
| 1450 | if (have < need) |
| 1451 | return 0; |
| 1452 | if ((r = sshbuf_consume(input, sizeof(s5_req))) != 0) |
| 1453 | fatal_fr(r, "channel %d: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1453 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: consume", c ->self); |
| 1454 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN0x03) { |
| 1455 | /* host string length */ |
| 1456 | if ((r = sshbuf_consume(input, 1)) != 0) |
| 1457 | fatal_fr(r, "channel %d: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1457 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: consume", c ->self); |
| 1458 | } |
| 1459 | if ((r = sshbuf_get(input, &dest_addr, addrlen)) != 0 || |
| 1460 | (r = sshbuf_get(input, &dest_port, 2)) != 0) { |
| 1461 | debug_r(r, "channel %d: parse addr/port", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1461 , 0, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "channel %d: parse addr/port" , c->self); |
| 1462 | return -1; |
| 1463 | } |
| 1464 | dest_addr[addrlen] = '\0'; |
| 1465 | free(c->path); |
| 1466 | c->path = NULL((void *)0); |
| 1467 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN0x03) { |
| 1468 | if (addrlen >= NI_MAXHOST256) { |
| 1469 | error("channel %d: dynamic request: socks5 hostname "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1470 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "channel %d: dynamic request: socks5 hostname " "\"%.100s\" too long", c->self, dest_addr) |
| 1470 | "\"%.100s\" too long", c->self, dest_addr)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1470 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "channel %d: dynamic request: socks5 hostname " "\"%.100s\" too long", c->self, dest_addr); |
| 1471 | return -1; |
| 1472 | } |
| 1473 | c->path = xstrdup(dest_addr); |
| 1474 | } else { |
| 1475 | if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL((void *)0)) |
| 1476 | return -1; |
| 1477 | c->path = xstrdup(ntop); |
| 1478 | } |
| 1479 | c->host_port = ntohs(dest_port)(__uint16_t)(__builtin_constant_p(dest_port) ? (__uint16_t)(( (__uint16_t)(dest_port) & 0xffU) << 8 | ((__uint16_t )(dest_port) & 0xff00U) >> 8) : __swap16md(dest_port )); |
| 1480 | |
| 1481 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1482 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: dynamic request: socks5 host %s port %u command %u" , c->self, c->path, c->host_port, s5_req.command) |
| 1482 | c->self, c->path, c->host_port, s5_req.command)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1482 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: dynamic request: socks5 host %s port %u command %u" , c->self, c->path, c->host_port, s5_req.command); |
| 1483 | |
| 1484 | s5_rsp.version = 0x05; |
| 1485 | s5_rsp.command = SSH_SOCKS5_SUCCESS0x00; |
| 1486 | s5_rsp.reserved = 0; /* ignored */ |
| 1487 | s5_rsp.atyp = SSH_SOCKS5_IPV40x01; |
| 1488 | dest_port = 0; /* ignored */ |
| 1489 | |
| 1490 | if ((r = sshbuf_put(output, &s5_rsp, sizeof(s5_rsp))) != 0 || |
| 1491 | (r = sshbuf_put_u32(output, ntohl(INADDR_ANY)(__uint32_t)(__builtin_constant_p(((u_int32_t)(0x00000000))) ? (__uint32_t)(((__uint32_t)(((u_int32_t)(0x00000000))) & 0xff ) << 24 | ((__uint32_t)(((u_int32_t)(0x00000000))) & 0xff00) << 8 | ((__uint32_t)(((u_int32_t)(0x00000000)) ) & 0xff0000) >> 8 | ((__uint32_t)(((u_int32_t)(0x00000000 ))) & 0xff000000) >> 24) : __swap32md(((u_int32_t)( 0x00000000)))))) != 0 || |
| 1492 | (r = sshbuf_put(output, &dest_port, sizeof(dest_port))) != 0) |
| 1493 | fatal_fr(r, "channel %d: append reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1493 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: append reply" , c->self); |
| 1494 | return 1; |
| 1495 | } |
| 1496 | |
| 1497 | Channel * |
| 1498 | channel_connect_stdio_fwd(struct ssh *ssh, |
| 1499 | const char *host_to_connect, u_short port_to_connect, |
| 1500 | int in, int out, int nonblock) |
| 1501 | { |
| 1502 | Channel *c; |
| 1503 | |
| 1504 | debug_f("%s:%d", host_to_connect, port_to_connect)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1504 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s:%d", host_to_connect , port_to_connect); |
| 1505 | |
| 1506 | c = channel_new(ssh, "stdio-forward", SSH_CHANNEL_OPENING3, in, out, |
| 1507 | -1, CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), |
| 1508 | 0, "stdio-forward", nonblock); |
| 1509 | |
| 1510 | c->path = xstrdup(host_to_connect); |
| 1511 | c->host_port = port_to_connect; |
| 1512 | c->listening_port = 0; |
| 1513 | c->force_drain = 1; |
| 1514 | |
| 1515 | channel_register_fds(ssh, c, in, out, -1, 0, 1, 0); |
| 1516 | port_open_helper(ssh, c, "direct-tcpip"); |
| 1517 | |
| 1518 | return c; |
| 1519 | } |
| 1520 | |
| 1521 | /* dynamic port forwarding */ |
| 1522 | static void |
| 1523 | channel_pre_dynamic(struct ssh *ssh, Channel *c) |
| 1524 | { |
| 1525 | const u_char *p; |
| 1526 | u_int have; |
| 1527 | int ret; |
| 1528 | |
| 1529 | c->io_want = 0; |
| 1530 | have = sshbuf_len(c->input); |
| 1531 | debug2("channel %d: pre_dynamic: have %d", c->self, have)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1531 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: pre_dynamic: have %d" , c->self, have); |
| 1532 | /* sshbuf_dump(c->input, stderr); */ |
| 1533 | /* check if the fixed size part of the packet is in buffer. */ |
| 1534 | if (have < 3) { |
| 1535 | /* need more */ |
| 1536 | c->io_want |= SSH_CHAN_IO_RFD0x01; |
| 1537 | return; |
| 1538 | } |
| 1539 | /* try to guess the protocol */ |
| 1540 | p = sshbuf_ptr(c->input); |
| 1541 | /* XXX sshbuf_peek_u8? */ |
| 1542 | switch (p[0]) { |
| 1543 | case 0x04: |
| 1544 | ret = channel_decode_socks4(c, c->input, c->output); |
| 1545 | break; |
| 1546 | case 0x05: |
| 1547 | ret = channel_decode_socks5(c, c->input, c->output); |
| 1548 | break; |
| 1549 | default: |
| 1550 | ret = -1; |
| 1551 | break; |
| 1552 | } |
| 1553 | if (ret < 0) { |
| 1554 | chan_mark_dead(ssh, c); |
| 1555 | } else if (ret == 0) { |
| 1556 | debug2("channel %d: pre_dynamic: need more", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1556 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: pre_dynamic: need more" , c->self); |
| 1557 | /* need more */ |
| 1558 | c->io_want |= SSH_CHAN_IO_RFD0x01; |
| 1559 | if (sshbuf_len(c->output)) |
| 1560 | c->io_want |= SSH_CHAN_IO_WFD0x02; |
| 1561 | } else { |
| 1562 | /* switch to the next state */ |
| 1563 | c->type = SSH_CHANNEL_OPENING3; |
| 1564 | port_open_helper(ssh, c, "direct-tcpip"); |
| 1565 | } |
| 1566 | } |
| 1567 | |
| 1568 | /* simulate read-error */ |
| 1569 | static void |
| 1570 | rdynamic_close(struct ssh *ssh, Channel *c) |
| 1571 | { |
| 1572 | c->type = SSH_CHANNEL_OPEN4; |
| 1573 | chan_read_failed(ssh, c); |
| 1574 | sshbuf_reset(c->input); |
| 1575 | chan_ibuf_empty(ssh, c); |
| 1576 | sshbuf_reset(c->output); |
| 1577 | chan_write_failed(ssh, c); |
| 1578 | } |
| 1579 | |
| 1580 | /* reverse dynamic port forwarding */ |
| 1581 | static void |
| 1582 | channel_before_prepare_io_rdynamic(struct ssh *ssh, Channel *c) |
| 1583 | { |
| 1584 | const u_char *p; |
| 1585 | u_int have, len; |
| 1586 | int r, ret; |
| 1587 | |
| 1588 | have = sshbuf_len(c->output); |
| 1589 | debug2("channel %d: pre_rdynamic: have %d", c->self, have)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1589 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: pre_rdynamic: have %d" , c->self, have); |
| 1590 | /* sshbuf_dump(c->output, stderr); */ |
| 1591 | /* EOF received */ |
| 1592 | if (c->flags & CHAN_EOF_RCVD0x08) { |
| 1593 | if ((r = sshbuf_consume(c->output, have)) != 0) |
| 1594 | fatal_fr(r, "channel %d: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1594 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: consume", c ->self); |
| 1595 | rdynamic_close(ssh, c); |
| 1596 | return; |
| 1597 | } |
| 1598 | /* check if the fixed size part of the packet is in buffer. */ |
| 1599 | if (have < 3) |
| 1600 | return; |
| 1601 | /* try to guess the protocol */ |
| 1602 | p = sshbuf_ptr(c->output); |
| 1603 | switch (p[0]) { |
| 1604 | case 0x04: |
| 1605 | /* switch input/output for reverse forwarding */ |
| 1606 | ret = channel_decode_socks4(c, c->output, c->input); |
| 1607 | break; |
| 1608 | case 0x05: |
| 1609 | ret = channel_decode_socks5(c, c->output, c->input); |
| 1610 | break; |
| 1611 | default: |
| 1612 | ret = -1; |
| 1613 | break; |
| 1614 | } |
| 1615 | if (ret < 0) { |
| 1616 | rdynamic_close(ssh, c); |
| 1617 | } else if (ret == 0) { |
| 1618 | debug2("channel %d: pre_rdynamic: need more", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1618 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: pre_rdynamic: need more" , c->self); |
| 1619 | /* send socks request to peer */ |
| 1620 | len = sshbuf_len(c->input); |
| 1621 | if (len > 0 && len < c->remote_window) { |
| 1622 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA94)) != 0 || |
| 1623 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 1624 | (r = sshpkt_put_stringb(ssh, c->input)) != 0 || |
| 1625 | (r = sshpkt_send(ssh)) != 0) { |
| 1626 | fatal_fr(r, "channel %i: rdynamic", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1626 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: rdynamic", c ->self); |
| 1627 | } |
| 1628 | if ((r = sshbuf_consume(c->input, len)) != 0) |
| 1629 | fatal_fr(r, "channel %d: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1629 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %d: consume", c ->self); |
| 1630 | c->remote_window -= len; |
| 1631 | } |
| 1632 | } else if (rdynamic_connect_finish(ssh, c) < 0) { |
| 1633 | /* the connect failed */ |
| 1634 | rdynamic_close(ssh, c); |
| 1635 | } |
| 1636 | } |
| 1637 | |
| 1638 | /* This is our fake X11 server socket. */ |
| 1639 | static void |
| 1640 | channel_post_x11_listener(struct ssh *ssh, Channel *c) |
| 1641 | { |
| 1642 | Channel *nc; |
| 1643 | struct sockaddr_storage addr; |
| 1644 | int r, newsock, oerrno, remote_port; |
| 1645 | socklen_t addrlen; |
| 1646 | char buf[16384], *remote_ipaddr; |
| 1647 | |
| 1648 | if ((c->io_ready & SSH_CHAN_IO_SOCK_R0x10) == 0) |
| 1649 | return; |
| 1650 | |
| 1651 | debug("X11 connection requested.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1651 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "X11 connection requested." ); |
| 1652 | addrlen = sizeof(addr); |
| 1653 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
| 1654 | if (c->single_connection) { |
| 1655 | oerrno = errno(*__errno()); |
| 1656 | debug2("single_connection: closing X11 listener.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1656 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "single_connection: closing X11 listener." ); |
| 1657 | channel_close_fd(ssh, c, &c->sock); |
| 1658 | chan_mark_dead(ssh, c); |
| 1659 | errno(*__errno()) = oerrno; |
| 1660 | } |
| 1661 | if (newsock == -1) { |
| 1662 | if (errno(*__errno()) != EINTR4 && errno(*__errno()) != EWOULDBLOCK35 && |
| 1663 | errno(*__errno()) != ECONNABORTED53) |
| 1664 | error("accept: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1664 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "accept: %.100s", strerror ((*__errno()))); |
| 1665 | if (errno(*__errno()) == EMFILE24 || errno(*__errno()) == ENFILE23) |
| 1666 | c->notbefore = monotime() + 1; |
| 1667 | return; |
| 1668 | } |
| 1669 | set_nodelay(newsock); |
| 1670 | remote_ipaddr = get_peer_ipaddr(newsock); |
| 1671 | remote_port = get_peer_port(newsock); |
| 1672 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
| 1673 | remote_ipaddr, remote_port); |
| 1674 | |
| 1675 | nc = channel_new(ssh, "accepted x11 socket", |
| 1676 | SSH_CHANNEL_OPENING3, newsock, newsock, -1, |
| 1677 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
| 1678 | open_preamble(ssh, __func__, nc, "x11"); |
| 1679 | if ((r = sshpkt_put_cstring(ssh, remote_ipaddr)) != 0 || |
| 1680 | (r = sshpkt_put_u32(ssh, remote_port)) != 0) { |
| 1681 | fatal_fr(r, "channel %i: reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1681 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: reply", c-> self); |
| 1682 | } |
| 1683 | if ((r = sshpkt_send(ssh)) != 0) |
| 1684 | fatal_fr(r, "channel %i: send", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1684 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: send", c-> self); |
| 1685 | free(remote_ipaddr); |
| 1686 | } |
| 1687 | |
| 1688 | static void |
| 1689 | port_open_helper(struct ssh *ssh, Channel *c, char *rtype) |
| 1690 | { |
| 1691 | char *local_ipaddr = get_local_ipaddr(c->sock); |
| 1692 | int local_port = c->sock == -1 ? 65536 : get_local_port(c->sock); |
| 1693 | char *remote_ipaddr = get_peer_ipaddr(c->sock); |
| 1694 | int remote_port = get_peer_port(c->sock); |
| 1695 | int r; |
| 1696 | |
| 1697 | if (remote_port == -1) { |
| 1698 | /* Fake addr/port to appease peers that validate it (Tectia) */ |
| 1699 | free(remote_ipaddr); |
| 1700 | remote_ipaddr = xstrdup("127.0.0.1"); |
| 1701 | remote_port = 65535; |
| 1702 | } |
| 1703 | |
| 1704 | free(c->remote_name); |
| 1705 | xasprintf(&c->remote_name, |
| 1706 | "%s: listening port %d for %.100s port %d, " |
| 1707 | "connect from %.200s port %d to %.100s port %d", |
| 1708 | rtype, c->listening_port, c->path, c->host_port, |
| 1709 | remote_ipaddr, remote_port, local_ipaddr, local_port); |
| 1710 | |
| 1711 | open_preamble(ssh, __func__, c, rtype); |
| 1712 | if (strcmp(rtype, "direct-tcpip") == 0) { |
| 1713 | /* target host, port */ |
| 1714 | if ((r = sshpkt_put_cstring(ssh, c->path)) != 0 || |
| 1715 | (r = sshpkt_put_u32(ssh, c->host_port)) != 0) |
| 1716 | fatal_fr(r, "channel %i: reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1716 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: reply", c-> self); |
| 1717 | } else if (strcmp(rtype, "direct-streamlocal@openssh.com") == 0) { |
| 1718 | /* target path */ |
| 1719 | if ((r = sshpkt_put_cstring(ssh, c->path)) != 0) |
| 1720 | fatal_fr(r, "channel %i: reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1720 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: reply", c-> self); |
| 1721 | } else if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) { |
| 1722 | /* listen path */ |
| 1723 | if ((r = sshpkt_put_cstring(ssh, c->path)) != 0) |
| 1724 | fatal_fr(r, "channel %i: reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1724 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: reply", c-> self); |
| 1725 | } else { |
| 1726 | /* listen address, port */ |
| 1727 | if ((r = sshpkt_put_cstring(ssh, c->path)) != 0 || |
| 1728 | (r = sshpkt_put_u32(ssh, local_port)) != 0) |
| 1729 | fatal_fr(r, "channel %i: reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1729 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: reply", c-> self); |
| 1730 | } |
| 1731 | if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) { |
| 1732 | /* reserved for future owner/mode info */ |
| 1733 | if ((r = sshpkt_put_cstring(ssh, "")) != 0) |
| 1734 | fatal_fr(r, "channel %i: reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1734 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: reply", c-> self); |
| 1735 | } else { |
| 1736 | /* originator host and port */ |
| 1737 | if ((r = sshpkt_put_cstring(ssh, remote_ipaddr)) != 0 || |
| 1738 | (r = sshpkt_put_u32(ssh, (u_int)remote_port)) != 0) |
| 1739 | fatal_fr(r, "channel %i: reply", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1739 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: reply", c-> self); |
| 1740 | } |
| 1741 | if ((r = sshpkt_send(ssh)) != 0) |
| 1742 | fatal_fr(r, "channel %i: send", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1742 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: send", c-> self); |
| 1743 | free(remote_ipaddr); |
| 1744 | free(local_ipaddr); |
| 1745 | } |
| 1746 | |
| 1747 | void |
| 1748 | channel_set_x11_refuse_time(struct ssh *ssh, u_int refuse_time) |
| 1749 | { |
| 1750 | ssh->chanctxt->x11_refuse_time = refuse_time; |
| 1751 | } |
| 1752 | |
| 1753 | /* |
| 1754 | * This socket is listening for connections to a forwarded TCP/IP port. |
| 1755 | */ |
| 1756 | static void |
| 1757 | channel_post_port_listener(struct ssh *ssh, Channel *c) |
| 1758 | { |
| 1759 | Channel *nc; |
| 1760 | struct sockaddr_storage addr; |
| 1761 | int newsock, nextstate; |
| 1762 | socklen_t addrlen; |
| 1763 | char *rtype; |
| 1764 | |
| 1765 | if ((c->io_ready & SSH_CHAN_IO_SOCK_R0x10) == 0) |
| 1766 | return; |
| 1767 | |
| 1768 | debug("Connection to port %d forwarding to %.100s port %d requested.",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1769 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Connection to port %d forwarding to %.100s port %d requested." , c->listening_port, c->path, c->host_port) |
| 1769 | c->listening_port, c->path, c->host_port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1769 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Connection to port %d forwarding to %.100s port %d requested." , c->listening_port, c->path, c->host_port); |
| 1770 | |
| 1771 | if (c->type == SSH_CHANNEL_RPORT_LISTENER11) { |
| 1772 | nextstate = SSH_CHANNEL_OPENING3; |
| 1773 | rtype = "forwarded-tcpip"; |
| 1774 | } else if (c->type == SSH_CHANNEL_RUNIX_LISTENER19) { |
| 1775 | nextstate = SSH_CHANNEL_OPENING3; |
| 1776 | rtype = "forwarded-streamlocal@openssh.com"; |
| 1777 | } else if (c->host_port == PORT_STREAMLOCAL-2) { |
| 1778 | nextstate = SSH_CHANNEL_OPENING3; |
| 1779 | rtype = "direct-streamlocal@openssh.com"; |
| 1780 | } else if (c->host_port == 0) { |
| 1781 | nextstate = SSH_CHANNEL_DYNAMIC13; |
| 1782 | rtype = "dynamic-tcpip"; |
| 1783 | } else { |
| 1784 | nextstate = SSH_CHANNEL_OPENING3; |
| 1785 | rtype = "direct-tcpip"; |
| 1786 | } |
| 1787 | |
| 1788 | addrlen = sizeof(addr); |
| 1789 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
| 1790 | if (newsock == -1) { |
| 1791 | if (errno(*__errno()) != EINTR4 && errno(*__errno()) != EWOULDBLOCK35 && |
| 1792 | errno(*__errno()) != ECONNABORTED53) |
| 1793 | error("accept: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1793 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "accept: %.100s", strerror ((*__errno()))); |
| 1794 | if (errno(*__errno()) == EMFILE24 || errno(*__errno()) == ENFILE23) |
| 1795 | c->notbefore = monotime() + 1; |
| 1796 | return; |
| 1797 | } |
| 1798 | if (c->host_port != PORT_STREAMLOCAL-2) |
| 1799 | set_nodelay(newsock); |
| 1800 | nc = channel_new(ssh, rtype, nextstate, newsock, newsock, -1, |
| 1801 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); |
| 1802 | nc->listening_port = c->listening_port; |
| 1803 | nc->host_port = c->host_port; |
| 1804 | if (c->path != NULL((void *)0)) |
| 1805 | nc->path = xstrdup(c->path); |
| 1806 | |
| 1807 | if (nextstate != SSH_CHANNEL_DYNAMIC13) |
| 1808 | port_open_helper(ssh, nc, rtype); |
| 1809 | } |
| 1810 | |
| 1811 | /* |
| 1812 | * This is the authentication agent socket listening for connections from |
| 1813 | * clients. |
| 1814 | */ |
| 1815 | static void |
| 1816 | channel_post_auth_listener(struct ssh *ssh, Channel *c) |
| 1817 | { |
| 1818 | Channel *nc; |
| 1819 | int r, newsock; |
| 1820 | struct sockaddr_storage addr; |
| 1821 | socklen_t addrlen; |
| 1822 | |
| 1823 | if ((c->io_ready & SSH_CHAN_IO_SOCK_R0x10) == 0) |
| 1824 | return; |
| 1825 | |
| 1826 | addrlen = sizeof(addr); |
| 1827 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
| 1828 | if (newsock == -1) { |
| 1829 | error("accept from auth socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1829 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "accept from auth socket: %.100s" , strerror((*__errno()))); |
| 1830 | if (errno(*__errno()) == EMFILE24 || errno(*__errno()) == ENFILE23) |
| 1831 | c->notbefore = monotime() + 1; |
| 1832 | return; |
| 1833 | } |
| 1834 | nc = channel_new(ssh, "accepted auth socket", |
| 1835 | SSH_CHANNEL_OPENING3, newsock, newsock, -1, |
| 1836 | c->local_window_max, c->local_maxpacket, |
| 1837 | 0, "accepted auth socket", 1); |
| 1838 | open_preamble(ssh, __func__, nc, "auth-agent@openssh.com"); |
| 1839 | if ((r = sshpkt_send(ssh)) != 0) |
| 1840 | fatal_fr(r, "channel %i", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1840 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i", c->self ); |
| 1841 | } |
| 1842 | |
| 1843 | static void |
| 1844 | channel_post_connecting(struct ssh *ssh, Channel *c) |
| 1845 | { |
| 1846 | int err = 0, sock, isopen, r; |
| 1847 | socklen_t sz = sizeof(err); |
| 1848 | |
| 1849 | if ((c->io_ready & SSH_CHAN_IO_SOCK_W0x20) == 0) |
| 1850 | return; |
| 1851 | if (!c->have_remote_id) |
| 1852 | fatal_f("channel %d: no remote id", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1852 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: no remote id" , c->self); |
| 1853 | /* for rdynamic the OPEN_CONFIRMATION has been sent already */ |
| 1854 | isopen = (c->type == SSH_CHANNEL_RDYNAMIC_FINISH22); |
| 1855 | if (getsockopt(c->sock, SOL_SOCKET0xffff, SO_ERROR0x1007, &err, &sz) == -1) { |
| 1856 | err = errno(*__errno()); |
| 1857 | error("getsockopt SO_ERROR failed")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1857 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "getsockopt SO_ERROR failed" ); |
| 1858 | } |
| 1859 | if (err == 0) { |
| 1860 | debug("channel %d: connected to %s port %d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1861 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: connected to %s port %d" , c->self, c->connect_ctx.host, c->connect_ctx.port) |
| 1861 | c->self, c->connect_ctx.host, c->connect_ctx.port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1861 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: connected to %s port %d" , c->self, c->connect_ctx.host, c->connect_ctx.port); |
| 1862 | channel_connect_ctx_free(&c->connect_ctx); |
| 1863 | c->type = SSH_CHANNEL_OPEN4; |
| 1864 | if (isopen) { |
| 1865 | /* no message necessary */ |
| 1866 | } else { |
| 1867 | if ((r = sshpkt_start(ssh, |
| 1868 | SSH2_MSG_CHANNEL_OPEN_CONFIRMATION91)) != 0 || |
| 1869 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 1870 | (r = sshpkt_put_u32(ssh, c->self)) != 0 || |
| 1871 | (r = sshpkt_put_u32(ssh, c->local_window)) != 0 || |
| 1872 | (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 || |
| 1873 | (r = sshpkt_send(ssh)) != 0) |
| 1874 | fatal_fr(r, "channel %i open confirm", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1874 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i open confirm" , c->self); |
| 1875 | } |
| 1876 | } else { |
| 1877 | debug("channel %d: connection failed: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1878 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: connection failed: %s" , c->self, strerror(err)) |
| 1878 | c->self, strerror(err))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1878 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: connection failed: %s" , c->self, strerror(err)); |
| 1879 | /* Try next address, if any */ |
| 1880 | if ((sock = connect_next(&c->connect_ctx)) > 0) { |
| 1881 | close(c->sock); |
| 1882 | c->sock = c->rfd = c->wfd = sock; |
| 1883 | return; |
| 1884 | } |
| 1885 | /* Exhausted all addresses */ |
| 1886 | error("connect_to %.100s port %d: failed.",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1887 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect_to %.100s port %d: failed." , c->connect_ctx.host, c->connect_ctx.port) |
| 1887 | c->connect_ctx.host, c->connect_ctx.port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1887 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect_to %.100s port %d: failed." , c->connect_ctx.host, c->connect_ctx.port); |
| 1888 | channel_connect_ctx_free(&c->connect_ctx); |
| 1889 | if (isopen) { |
| 1890 | rdynamic_close(ssh, c); |
| 1891 | } else { |
| 1892 | if ((r = sshpkt_start(ssh, |
| 1893 | SSH2_MSG_CHANNEL_OPEN_FAILURE92)) != 0 || |
| 1894 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 1895 | (r = sshpkt_put_u32(ssh, |
| 1896 | SSH2_OPEN_CONNECT_FAILED2)) != 0 || |
| 1897 | (r = sshpkt_put_cstring(ssh, strerror(err))) != 0 || |
| 1898 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 1899 | (r = sshpkt_send(ssh)) != 0) |
| 1900 | fatal_fr(r, "channel %i: failure", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1900 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: failure", c ->self); |
| 1901 | chan_mark_dead(ssh, c); |
| 1902 | } |
| 1903 | } |
| 1904 | } |
| 1905 | |
| 1906 | static int |
| 1907 | channel_handle_rfd(struct ssh *ssh, Channel *c) |
| 1908 | { |
| 1909 | char buf[CHAN_RBUF(16*1024)]; |
| 1910 | ssize_t len; |
| 1911 | int r; |
| 1912 | |
| 1913 | if ((c->io_ready & SSH_CHAN_IO_RFD0x01) == 0) |
| 1914 | return 1; |
| 1915 | |
| 1916 | len = read(c->rfd, buf, sizeof(buf)); |
| 1917 | if (len == -1 && (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35)) |
| 1918 | return 1; |
| 1919 | if (len <= 0) { |
| 1920 | debug2("channel %d: read<=0 rfd %d len %zd",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1921 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: read<=0 rfd %d len %zd" , c->self, c->rfd, len) |
| 1921 | c->self, c->rfd, len)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1921 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: read<=0 rfd %d len %zd" , c->self, c->rfd, len); |
| 1922 | if (c->type != SSH_CHANNEL_OPEN4) { |
| 1923 | debug2("channel %d: not open", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1923 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: not open" , c->self); |
| 1924 | chan_mark_dead(ssh, c); |
| 1925 | return -1; |
| 1926 | } else { |
| 1927 | chan_read_failed(ssh, c); |
| 1928 | } |
| 1929 | return -1; |
| 1930 | } |
| 1931 | if (c->input_filter != NULL((void *)0)) { |
| 1932 | if (c->input_filter(ssh, c, buf, len) == -1) { |
| 1933 | debug2("channel %d: filter stops", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1933 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: filter stops" , c->self); |
| 1934 | chan_read_failed(ssh, c); |
| 1935 | } |
| 1936 | } else if (c->datagram) { |
| 1937 | if ((r = sshbuf_put_string(c->input, buf, len)) != 0) |
| 1938 | fatal_fr(r, "channel %i: put datagram", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1938 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: put datagram" , c->self); |
| 1939 | } else if ((r = sshbuf_put(c->input, buf, len)) != 0) |
| 1940 | fatal_fr(r, "channel %i: put data", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1940 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: put data", c ->self); |
| 1941 | return 1; |
| 1942 | } |
| 1943 | |
| 1944 | static int |
| 1945 | channel_handle_wfd(struct ssh *ssh, Channel *c) |
| 1946 | { |
| 1947 | struct termios tio; |
| 1948 | u_char *data = NULL((void *)0), *buf; /* XXX const; need filter API change */ |
| 1949 | size_t dlen, olen = 0; |
| 1950 | int r, len; |
| 1951 | |
| 1952 | if ((c->io_ready & SSH_CHAN_IO_WFD0x02) == 0) |
| 1953 | return 1; |
| 1954 | if (sshbuf_len(c->output) == 0) |
| 1955 | return 1; |
| 1956 | |
| 1957 | /* Send buffered output data to the socket. */ |
| 1958 | olen = sshbuf_len(c->output); |
| 1959 | if (c->output_filter != NULL((void *)0)) { |
| 1960 | if ((buf = c->output_filter(ssh, c, &data, &dlen)) == NULL((void *)0)) { |
| 1961 | debug2("channel %d: filter stops", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1961 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: filter stops" , c->self); |
| 1962 | if (c->type != SSH_CHANNEL_OPEN4) |
| 1963 | chan_mark_dead(ssh, c); |
| 1964 | else |
| 1965 | chan_write_failed(ssh, c); |
| 1966 | return -1; |
| 1967 | } |
| 1968 | } else if (c->datagram) { |
| 1969 | if ((r = sshbuf_get_string(c->output, &data, &dlen)) != 0) |
| 1970 | fatal_fr(r, "channel %i: get datagram", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1970 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: get datagram" , c->self); |
| 1971 | buf = data; |
| 1972 | } else { |
| 1973 | buf = data = sshbuf_mutable_ptr(c->output); |
| 1974 | dlen = sshbuf_len(c->output); |
| 1975 | } |
| 1976 | |
| 1977 | if (c->datagram) { |
| 1978 | /* ignore truncated writes, datagrams might get lost */ |
| 1979 | len = write(c->wfd, buf, dlen); |
| 1980 | free(data); |
| 1981 | if (len == -1 && (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35)) |
| 1982 | return 1; |
| 1983 | if (len <= 0) |
| 1984 | goto write_fail; |
| 1985 | goto out; |
| 1986 | } |
| 1987 | |
| 1988 | len = write(c->wfd, buf, dlen); |
| 1989 | if (len == -1 && (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35)) |
| 1990 | return 1; |
| 1991 | if (len <= 0) { |
| 1992 | write_fail: |
| 1993 | if (c->type != SSH_CHANNEL_OPEN4) { |
| 1994 | debug2("channel %d: not open", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 1994 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: not open" , c->self); |
| 1995 | chan_mark_dead(ssh, c); |
| 1996 | return -1; |
| 1997 | } else { |
| 1998 | chan_write_failed(ssh, c); |
| 1999 | } |
| 2000 | return -1; |
| 2001 | } |
| 2002 | if (c->isatty && dlen >= 1 && buf[0] != '\r') { |
| 2003 | if (tcgetattr(c->wfd, &tio) == 0 && |
| 2004 | !(tio.c_lflag & ECHO0x00000008) && (tio.c_lflag & ICANON0x00000100)) { |
| 2005 | /* |
| 2006 | * Simulate echo to reduce the impact of |
| 2007 | * traffic analysis. We need to match the |
| 2008 | * size of a SSH2_MSG_CHANNEL_DATA message |
| 2009 | * (4 byte channel id + buf) |
| 2010 | */ |
| 2011 | if ((r = sshpkt_msg_ignore(ssh, 4+len)) != 0 || |
| 2012 | (r = sshpkt_send(ssh)) != 0) |
| 2013 | fatal_fr(r, "channel %i: ignore", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2013 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: ignore", c-> self); |
| 2014 | } |
| 2015 | } |
| 2016 | if ((r = sshbuf_consume(c->output, len)) != 0) |
| 2017 | fatal_fr(r, "channel %i: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2017 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: consume", c ->self); |
| 2018 | out: |
| 2019 | c->local_consumed += olen - sshbuf_len(c->output); |
| 2020 | |
| 2021 | return 1; |
| 2022 | } |
| 2023 | |
| 2024 | static int |
| 2025 | channel_handle_efd_write(struct ssh *ssh, Channel *c) |
| 2026 | { |
| 2027 | int r; |
| 2028 | ssize_t len; |
| 2029 | |
| 2030 | if ((c->io_ready & SSH_CHAN_IO_EFD_W0x08) == 0) |
| 2031 | return 1; |
| 2032 | if (sshbuf_len(c->extended) == 0) |
| 2033 | return 1; |
| 2034 | |
| 2035 | len = write(c->efd, sshbuf_ptr(c->extended), |
| 2036 | sshbuf_len(c->extended)); |
| 2037 | debug2("channel %d: written %zd to efd %d", c->self, len, c->efd)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2037 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: written %zd to efd %d" , c->self, len, c->efd); |
| 2038 | if (len == -1 && (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35)) |
| 2039 | return 1; |
| 2040 | if (len <= 0) { |
| 2041 | debug2("channel %d: closing write-efd %d", c->self, c->efd)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2041 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: closing write-efd %d" , c->self, c->efd); |
| 2042 | channel_close_fd(ssh, c, &c->efd); |
| 2043 | } else { |
| 2044 | if ((r = sshbuf_consume(c->extended, len)) != 0) |
| 2045 | fatal_fr(r, "channel %i: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2045 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: consume", c ->self); |
| 2046 | c->local_consumed += len; |
| 2047 | } |
| 2048 | return 1; |
| 2049 | } |
| 2050 | |
| 2051 | static int |
| 2052 | channel_handle_efd_read(struct ssh *ssh, Channel *c) |
| 2053 | { |
| 2054 | char buf[CHAN_RBUF(16*1024)]; |
| 2055 | int r; |
| 2056 | ssize_t len; |
| 2057 | |
| 2058 | if ((c->io_ready & SSH_CHAN_IO_EFD_R0x04) == 0) |
| 2059 | return 1; |
| 2060 | |
| 2061 | len = read(c->efd, buf, sizeof(buf)); |
| 2062 | debug2("channel %d: read %zd from efd %d", c->self, len, c->efd)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2062 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: read %zd from efd %d" , c->self, len, c->efd); |
| 2063 | if (len == -1 && (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35)) |
| 2064 | return 1; |
| 2065 | if (len <= 0) { |
| 2066 | debug2("channel %d: closing read-efd %d", c->self, c->efd)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2066 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: closing read-efd %d" , c->self, c->efd); |
| 2067 | channel_close_fd(ssh, c, &c->efd); |
| 2068 | } else if (c->extended_usage == CHAN_EXTENDED_IGNORE0) |
| 2069 | debug3("channel %d: discard efd", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2069 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: discard efd" , c->self); |
| 2070 | else if ((r = sshbuf_put(c->extended, buf, len)) != 0) |
| 2071 | fatal_fr(r, "channel %i: append", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2071 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: append", c-> self); |
| 2072 | return 1; |
| 2073 | } |
| 2074 | |
| 2075 | static int |
| 2076 | channel_handle_efd(struct ssh *ssh, Channel *c) |
| 2077 | { |
| 2078 | if (c->efd == -1) |
| 2079 | return 1; |
| 2080 | |
| 2081 | /** XXX handle drain efd, too */ |
| 2082 | |
| 2083 | if (c->extended_usage == CHAN_EXTENDED_WRITE2) |
| 2084 | return channel_handle_efd_write(ssh, c); |
| 2085 | else if (c->extended_usage == CHAN_EXTENDED_READ1 || |
| 2086 | c->extended_usage == CHAN_EXTENDED_IGNORE0) |
| 2087 | return channel_handle_efd_read(ssh, c); |
| 2088 | |
| 2089 | return 1; |
| 2090 | } |
| 2091 | |
| 2092 | static int |
| 2093 | channel_check_window(struct ssh *ssh, Channel *c) |
| 2094 | { |
| 2095 | int r; |
| 2096 | |
| 2097 | if (c->type == SSH_CHANNEL_OPEN4 && |
| 2098 | !(c->flags & (CHAN_CLOSE_SENT0x01|CHAN_CLOSE_RCVD0x02)) && |
| 2099 | ((c->local_window_max - c->local_window > |
| 2100 | c->local_maxpacket*3) || |
| 2101 | c->local_window < c->local_window_max/2) && |
| 2102 | c->local_consumed > 0) { |
| 2103 | if (!c->have_remote_id) |
| 2104 | fatal_f("channel %d: no remote id", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2104 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: no remote id" , c->self); |
| 2105 | if ((r = sshpkt_start(ssh, |
| 2106 | SSH2_MSG_CHANNEL_WINDOW_ADJUST93)) != 0 || |
| 2107 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 2108 | (r = sshpkt_put_u32(ssh, c->local_consumed)) != 0 || |
| 2109 | (r = sshpkt_send(ssh)) != 0) { |
| 2110 | fatal_fr(r, "channel %i", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2110 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i", c->self ); |
| 2111 | } |
| 2112 | debug2("channel %d: window %d sent adjust %d", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2113 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: window %d sent adjust %d" , c->self, c->local_window, c->local_consumed) |
| 2113 | c->local_window, c->local_consumed)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2113 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: window %d sent adjust %d" , c->self, c->local_window, c->local_consumed); |
| 2114 | c->local_window += c->local_consumed; |
| 2115 | c->local_consumed = 0; |
| 2116 | } |
| 2117 | return 1; |
| 2118 | } |
| 2119 | |
| 2120 | static void |
| 2121 | channel_post_open(struct ssh *ssh, Channel *c) |
| 2122 | { |
| 2123 | channel_handle_rfd(ssh, c); |
| 2124 | channel_handle_wfd(ssh, c); |
| 2125 | channel_handle_efd(ssh, c); |
| 2126 | channel_check_window(ssh, c); |
| 2127 | } |
| 2128 | |
| 2129 | static u_int |
| 2130 | read_mux(struct ssh *ssh, Channel *c, u_int need) |
| 2131 | { |
| 2132 | char buf[CHAN_RBUF(16*1024)]; |
| 2133 | ssize_t len; |
| 2134 | u_int rlen; |
| 2135 | int r; |
| 2136 | |
| 2137 | if (sshbuf_len(c->input) < need) { |
| 2138 | rlen = need - sshbuf_len(c->input); |
| 2139 | len = read(c->rfd, buf, MINIMUM(rlen, CHAN_RBUF)(((rlen) < ((16*1024))) ? (rlen) : ((16*1024)))); |
| 2140 | if (len == -1 && (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35)) |
| 2141 | return sshbuf_len(c->input); |
| 2142 | if (len <= 0) { |
| 2143 | debug2("channel %d: ctl read<=0 rfd %d len %zd",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2144 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: ctl read<=0 rfd %d len %zd" , c->self, c->rfd, len) |
| 2144 | c->self, c->rfd, len)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2144 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: ctl read<=0 rfd %d len %zd" , c->self, c->rfd, len); |
| 2145 | chan_read_failed(ssh, c); |
| 2146 | return 0; |
| 2147 | } else if ((r = sshbuf_put(c->input, buf, len)) != 0) |
| 2148 | fatal_fr(r, "channel %i: append", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2148 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: append", c-> self); |
| 2149 | } |
| 2150 | return sshbuf_len(c->input); |
| 2151 | } |
| 2152 | |
| 2153 | static void |
| 2154 | channel_post_mux_client_read(struct ssh *ssh, Channel *c) |
| 2155 | { |
| 2156 | u_int need; |
| 2157 | |
| 2158 | if ((c->io_ready & SSH_CHAN_IO_RFD0x01) == 0) |
| 2159 | return; |
| 2160 | if (c->istate != CHAN_INPUT_OPEN0 && c->istate != CHAN_INPUT_WAIT_DRAIN1) |
| 2161 | return; |
| 2162 | if (c->mux_pause) |
| 2163 | return; |
| 2164 | |
| 2165 | /* |
| 2166 | * Don't not read past the precise end of packets to |
| 2167 | * avoid disrupting fd passing. |
| 2168 | */ |
| 2169 | if (read_mux(ssh, c, 4) < 4) /* read header */ |
| 2170 | return; |
| 2171 | /* XXX sshbuf_peek_u32 */ |
| 2172 | need = PEEK_U32(sshbuf_ptr(c->input))(((u_int32_t)(((const u_char *)(sshbuf_ptr(c->input)))[0]) << 24) | ((u_int32_t)(((const u_char *)(sshbuf_ptr(c-> input)))[1]) << 16) | ((u_int32_t)(((const u_char *)(sshbuf_ptr (c->input)))[2]) << 8) | (u_int32_t)(((const u_char * )(sshbuf_ptr(c->input)))[3])); |
| 2173 | #define CHANNEL_MUX_MAX_PACKET(256 * 1024) (256 * 1024) |
| 2174 | if (need > CHANNEL_MUX_MAX_PACKET(256 * 1024)) { |
| 2175 | debug2("channel %d: packet too big %u > %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2176 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: packet too big %u > %u" , c->self, (256 * 1024), need) |
| 2176 | c->self, CHANNEL_MUX_MAX_PACKET, need)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2176 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: packet too big %u > %u" , c->self, (256 * 1024), need); |
| 2177 | chan_rcvd_oclose(ssh, c); |
| 2178 | return; |
| 2179 | } |
| 2180 | if (read_mux(ssh, c, need + 4) < need + 4) /* read body */ |
| 2181 | return; |
| 2182 | if (c->mux_rcb(ssh, c) != 0) { |
| 2183 | debug("channel %d: mux_rcb failed", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2183 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: mux_rcb failed" , c->self); |
| 2184 | chan_mark_dead(ssh, c); |
| 2185 | return; |
| 2186 | } |
| 2187 | } |
| 2188 | |
| 2189 | static void |
| 2190 | channel_post_mux_client_write(struct ssh *ssh, Channel *c) |
| 2191 | { |
| 2192 | ssize_t len; |
| 2193 | int r; |
| 2194 | |
| 2195 | if ((c->io_ready & SSH_CHAN_IO_WFD0x02) == 0) |
| 2196 | return; |
| 2197 | if (sshbuf_len(c->output) == 0) |
| 2198 | return; |
| 2199 | |
| 2200 | len = write(c->wfd, sshbuf_ptr(c->output), sshbuf_len(c->output)); |
| 2201 | if (len == -1 && (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35)) |
| 2202 | return; |
| 2203 | if (len <= 0) { |
| 2204 | chan_mark_dead(ssh, c); |
| 2205 | return; |
| 2206 | } |
| 2207 | if ((r = sshbuf_consume(c->output, len)) != 0) |
| 2208 | fatal_fr(r, "channel %i: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2208 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: consume", c ->self); |
| 2209 | } |
| 2210 | |
| 2211 | static void |
| 2212 | channel_post_mux_client(struct ssh *ssh, Channel *c) |
| 2213 | { |
| 2214 | channel_post_mux_client_read(ssh, c); |
| 2215 | channel_post_mux_client_write(ssh, c); |
| 2216 | } |
| 2217 | |
| 2218 | static void |
| 2219 | channel_post_mux_listener(struct ssh *ssh, Channel *c) |
| 2220 | { |
| 2221 | Channel *nc; |
| 2222 | struct sockaddr_storage addr; |
| 2223 | socklen_t addrlen; |
| 2224 | int newsock; |
| 2225 | uid_t euid; |
| 2226 | gid_t egid; |
| 2227 | |
| 2228 | if ((c->io_ready & SSH_CHAN_IO_SOCK_R0x10) == 0) |
| 2229 | return; |
| 2230 | |
| 2231 | debug("multiplexing control connection")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2231 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "multiplexing control connection" ); |
| 2232 | |
| 2233 | /* |
| 2234 | * Accept connection on control socket |
| 2235 | */ |
| 2236 | memset(&addr, 0, sizeof(addr)); |
| 2237 | addrlen = sizeof(addr); |
| 2238 | if ((newsock = accept(c->sock, (struct sockaddr*)&addr, |
| 2239 | &addrlen)) == -1) { |
| 2240 | error_f("accept: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2240 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "accept: %s", strerror( (*__errno()))); |
| 2241 | if (errno(*__errno()) == EMFILE24 || errno(*__errno()) == ENFILE23) |
| 2242 | c->notbefore = monotime() + 1; |
| 2243 | return; |
| 2244 | } |
| 2245 | |
| 2246 | if (getpeereid(newsock, &euid, &egid) == -1) { |
| 2247 | error_f("getpeereid failed: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2247 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "getpeereid failed: %s" , strerror((*__errno()))); |
| 2248 | close(newsock); |
| 2249 | return; |
| 2250 | } |
| 2251 | if ((euid != 0) && (getuid() != euid)) { |
| 2252 | error("multiplex uid mismatch: peer euid %u != uid %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2253 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "multiplex uid mismatch: peer euid %u != uid %u" , (u_int)euid, (u_int)getuid()) |
| 2253 | (u_int)euid, (u_int)getuid())sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2253 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "multiplex uid mismatch: peer euid %u != uid %u" , (u_int)euid, (u_int)getuid()); |
| 2254 | close(newsock); |
| 2255 | return; |
| 2256 | } |
| 2257 | nc = channel_new(ssh, "multiplex client", SSH_CHANNEL_MUX_CLIENT16, |
| 2258 | newsock, newsock, -1, c->local_window_max, |
| 2259 | c->local_maxpacket, 0, "mux-control", 1); |
| 2260 | nc->mux_rcb = c->mux_rcb; |
| 2261 | debug3_f("new mux channel %d fd %d", nc->self, nc->sock)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2261 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "new mux channel %d fd %d" , nc->self, nc->sock); |
| 2262 | /* establish state */ |
| 2263 | nc->mux_rcb(ssh, nc); |
| 2264 | /* mux state transitions must not elicit protocol messages */ |
| 2265 | nc->flags |= CHAN_LOCAL0x10; |
| 2266 | } |
| 2267 | |
| 2268 | static void |
| 2269 | channel_handler_init(struct ssh_channels *sc) |
| 2270 | { |
| 2271 | chan_fn **pre, **post; |
| 2272 | |
| 2273 | if ((pre = calloc(SSH_CHANNEL_MAX_TYPE23, sizeof(*pre))) == NULL((void *)0) || |
| 2274 | (post = calloc(SSH_CHANNEL_MAX_TYPE23, sizeof(*post))) == NULL((void *)0)) |
| 2275 | fatal_f("allocation failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2275 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "allocation failed"); |
| 2276 | |
| 2277 | pre[SSH_CHANNEL_OPEN4] = &channel_pre_open; |
| 2278 | pre[SSH_CHANNEL_X11_OPEN7] = &channel_pre_x11_open; |
| 2279 | pre[SSH_CHANNEL_PORT_LISTENER2] = &channel_pre_listener; |
| 2280 | pre[SSH_CHANNEL_RPORT_LISTENER11] = &channel_pre_listener; |
| 2281 | pre[SSH_CHANNEL_UNIX_LISTENER18] = &channel_pre_listener; |
| 2282 | pre[SSH_CHANNEL_RUNIX_LISTENER19] = &channel_pre_listener; |
| 2283 | pre[SSH_CHANNEL_X11_LISTENER1] = &channel_pre_listener; |
| 2284 | pre[SSH_CHANNEL_AUTH_SOCKET6] = &channel_pre_listener; |
| 2285 | pre[SSH_CHANNEL_CONNECTING12] = &channel_pre_connecting; |
| 2286 | pre[SSH_CHANNEL_DYNAMIC13] = &channel_pre_dynamic; |
| 2287 | pre[SSH_CHANNEL_RDYNAMIC_FINISH22] = &channel_pre_connecting; |
| 2288 | pre[SSH_CHANNEL_MUX_LISTENER15] = &channel_pre_listener; |
| 2289 | pre[SSH_CHANNEL_MUX_CLIENT16] = &channel_pre_mux_client; |
| 2290 | |
| 2291 | post[SSH_CHANNEL_OPEN4] = &channel_post_open; |
| 2292 | post[SSH_CHANNEL_PORT_LISTENER2] = &channel_post_port_listener; |
| 2293 | post[SSH_CHANNEL_RPORT_LISTENER11] = &channel_post_port_listener; |
| 2294 | post[SSH_CHANNEL_UNIX_LISTENER18] = &channel_post_port_listener; |
| 2295 | post[SSH_CHANNEL_RUNIX_LISTENER19] = &channel_post_port_listener; |
| 2296 | post[SSH_CHANNEL_X11_LISTENER1] = &channel_post_x11_listener; |
| 2297 | post[SSH_CHANNEL_AUTH_SOCKET6] = &channel_post_auth_listener; |
| 2298 | post[SSH_CHANNEL_CONNECTING12] = &channel_post_connecting; |
| 2299 | post[SSH_CHANNEL_DYNAMIC13] = &channel_post_open; |
| 2300 | post[SSH_CHANNEL_RDYNAMIC_FINISH22] = &channel_post_connecting; |
| 2301 | post[SSH_CHANNEL_MUX_LISTENER15] = &channel_post_mux_listener; |
| 2302 | post[SSH_CHANNEL_MUX_CLIENT16] = &channel_post_mux_client; |
| 2303 | |
| 2304 | sc->channel_pre = pre; |
| 2305 | sc->channel_post = post; |
| 2306 | } |
| 2307 | |
| 2308 | /* gc dead channels */ |
| 2309 | static void |
| 2310 | channel_garbage_collect(struct ssh *ssh, Channel *c) |
| 2311 | { |
| 2312 | if (c == NULL((void *)0)) |
| 2313 | return; |
| 2314 | if (c->detach_user != NULL((void *)0)) { |
| 2315 | if (!chan_is_dead(ssh, c, c->detach_close)) |
| 2316 | return; |
| 2317 | |
| 2318 | debug2("channel %d: gc: notify user", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2318 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: gc: notify user" , c->self); |
| 2319 | c->detach_user(ssh, c->self, NULL((void *)0)); |
| 2320 | /* if we still have a callback */ |
| 2321 | if (c->detach_user != NULL((void *)0)) |
| 2322 | return; |
| 2323 | debug2("channel %d: gc: user detached", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2323 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: gc: user detached" , c->self); |
| 2324 | } |
| 2325 | if (!chan_is_dead(ssh, c, 1)) |
| 2326 | return; |
| 2327 | debug2("channel %d: garbage collecting", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2327 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: garbage collecting" , c->self); |
| 2328 | channel_free(ssh, c); |
| 2329 | } |
| 2330 | |
| 2331 | enum channel_table { CHAN_PRE, CHAN_POST }; |
| 2332 | |
| 2333 | static void |
| 2334 | channel_handler(struct ssh *ssh, int table, time_t *unpause_secs) |
| 2335 | { |
| 2336 | struct ssh_channels *sc = ssh->chanctxt; |
| 2337 | chan_fn **ftab = table == CHAN_PRE ? sc->channel_pre : sc->channel_post; |
| 2338 | u_int i, oalloc; |
| 2339 | Channel *c; |
| 2340 | time_t now; |
| 2341 | |
| 2342 | now = monotime(); |
| 2343 | if (unpause_secs != NULL((void *)0)) |
| 2344 | *unpause_secs = 0; |
| 2345 | for (i = 0, oalloc = sc->channels_alloc; i < oalloc; i++) { |
| 2346 | c = sc->channels[i]; |
| 2347 | if (c == NULL((void *)0)) |
| 2348 | continue; |
| 2349 | if (c->delayed) { |
| 2350 | if (table == CHAN_PRE) |
| 2351 | c->delayed = 0; |
| 2352 | else |
| 2353 | continue; |
| 2354 | } |
| 2355 | if (ftab[c->type] != NULL((void *)0)) { |
| 2356 | /* |
| 2357 | * Run handlers that are not paused. |
| 2358 | */ |
| 2359 | if (c->notbefore <= now) |
| 2360 | (*ftab[c->type])(ssh, c); |
| 2361 | else if (unpause_secs != NULL((void *)0)) { |
| 2362 | /* |
| 2363 | * Collect the time that the earliest |
| 2364 | * channel comes off pause. |
| 2365 | */ |
| 2366 | debug3_f("chan %d: skip for %d more "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2368 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "chan %d: skip for %d more " "seconds", c->self, (int)(c->notbefore - now)) |
| 2367 | "seconds", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2368 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "chan %d: skip for %d more " "seconds", c->self, (int)(c->notbefore - now)) |
| 2368 | (int)(c->notbefore - now))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2368 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "chan %d: skip for %d more " "seconds", c->self, (int)(c->notbefore - now)); |
| 2369 | if (*unpause_secs == 0 || |
| 2370 | (c->notbefore - now) < *unpause_secs) |
| 2371 | *unpause_secs = c->notbefore - now; |
| 2372 | } |
| 2373 | } |
| 2374 | channel_garbage_collect(ssh, c); |
| 2375 | } |
| 2376 | if (unpause_secs != NULL((void *)0) && *unpause_secs != 0) |
| 2377 | debug3_f("first channel unpauses in %d seconds",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2378 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "first channel unpauses in %d seconds" , (int)*unpause_secs) |
| 2378 | (int)*unpause_secs)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2378 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "first channel unpauses in %d seconds" , (int)*unpause_secs); |
| 2379 | } |
| 2380 | |
| 2381 | /* |
| 2382 | * Create sockets before preparing IO. |
| 2383 | * This is necessary for things that need to happen after reading |
| 2384 | * the network-input but need to be completed before IO event setup, e.g. |
| 2385 | * because they may create new channels. |
| 2386 | */ |
| 2387 | static void |
| 2388 | channel_before_prepare_io(struct ssh *ssh) |
| 2389 | { |
| 2390 | struct ssh_channels *sc = ssh->chanctxt; |
| 2391 | Channel *c; |
| 2392 | u_int i, oalloc; |
| 2393 | |
| 2394 | for (i = 0, oalloc = sc->channels_alloc; i < oalloc; i++) { |
| 2395 | c = sc->channels[i]; |
| 2396 | if (c == NULL((void *)0)) |
| 2397 | continue; |
| 2398 | if (c->type == SSH_CHANNEL_RDYNAMIC_OPEN21) |
| 2399 | channel_before_prepare_io_rdynamic(ssh, c); |
| 2400 | } |
| 2401 | } |
| 2402 | |
| 2403 | static void |
| 2404 | dump_channel_poll(const char *func, const char *what, Channel *c, |
| 2405 | u_int pollfd_offset, struct pollfd *pfd) |
| 2406 | { |
| 2407 | #ifdef DEBUG_CHANNEL_POLL |
| 2408 | debug3_f("channel %d: rfd r%d w%d e%d s%d "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2411 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: rfd r%d w%d e%d s%d " "pfd[%u].fd=%d want 0x%02x ev 0x%02x ready 0x%02x rev 0x%02x" , c->self, c->rfd, c->wfd, c->efd, c->sock, pollfd_offset , pfd->fd, c->io_want, pfd->events, c->io_ready, pfd ->revents) |
| 2409 | "pfd[%u].fd=%d want 0x%02x ev 0x%02x ready 0x%02x rev 0x%02x",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2411 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: rfd r%d w%d e%d s%d " "pfd[%u].fd=%d want 0x%02x ev 0x%02x ready 0x%02x rev 0x%02x" , c->self, c->rfd, c->wfd, c->efd, c->sock, pollfd_offset , pfd->fd, c->io_want, pfd->events, c->io_ready, pfd ->revents) |
| 2410 | c->self, c->rfd, c->wfd, c->efd, c->sock, pollfd_offset, pfd->fd,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2411 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: rfd r%d w%d e%d s%d " "pfd[%u].fd=%d want 0x%02x ev 0x%02x ready 0x%02x rev 0x%02x" , c->self, c->rfd, c->wfd, c->efd, c->sock, pollfd_offset , pfd->fd, c->io_want, pfd->events, c->io_ready, pfd ->revents) |
| 2411 | c->io_want, pfd->events, c->io_ready, pfd->revents)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2411 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: rfd r%d w%d e%d s%d " "pfd[%u].fd=%d want 0x%02x ev 0x%02x ready 0x%02x rev 0x%02x" , c->self, c->rfd, c->wfd, c->efd, c->sock, pollfd_offset , pfd->fd, c->io_want, pfd->events, c->io_ready, pfd ->revents); |
| 2412 | #endif |
| 2413 | } |
| 2414 | |
| 2415 | /* Prepare pollfd entries for a single channel */ |
| 2416 | static void |
| 2417 | channel_prepare_pollfd(Channel *c, u_int *next_pollfd, |
| 2418 | struct pollfd *pfd, u_int npfd) |
| 2419 | { |
| 2420 | u_int p = *next_pollfd; |
| 2421 | |
| 2422 | if (c == NULL((void *)0)) |
| 2423 | return; |
| 2424 | if (p + 4 > npfd) { |
| 2425 | /* Shouldn't happen */ |
| 2426 | fatal_f("channel %d: bad pfd offset %u (max %u)",sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2427 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: bad pfd offset %u (max %u)" , c->self, p, npfd) |
| 2427 | c->self, p, npfd)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2427 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: bad pfd offset %u (max %u)" , c->self, p, npfd); |
| 2428 | } |
| 2429 | c->pollfd_offset = -1; |
| 2430 | /* |
| 2431 | * prepare c->rfd |
| 2432 | * |
| 2433 | * This is a special case, since c->rfd might be the same as |
| 2434 | * c->wfd, c->efd and/or c->sock. Handle those here if they want |
| 2435 | * IO too. |
| 2436 | */ |
| 2437 | if (c->rfd != -1) { |
| 2438 | if (c->pollfd_offset == -1) |
| 2439 | c->pollfd_offset = p; |
| 2440 | pfd[p].fd = c->rfd; |
| 2441 | pfd[p].events = 0; |
| 2442 | if ((c->io_want & SSH_CHAN_IO_RFD0x01) != 0) |
| 2443 | pfd[p].events |= POLLIN0x0001; |
| 2444 | /* rfd == wfd */ |
| 2445 | if (c->wfd == c->rfd && |
| 2446 | (c->io_want & SSH_CHAN_IO_WFD0x02) != 0) |
| 2447 | pfd[p].events |= POLLOUT0x0004; |
| 2448 | /* rfd == efd */ |
| 2449 | if (c->efd == c->rfd && |
| 2450 | (c->io_want & SSH_CHAN_IO_EFD_R0x04) != 0) |
| 2451 | pfd[p].events |= POLLIN0x0001; |
| 2452 | if (c->efd == c->rfd && |
| 2453 | (c->io_want & SSH_CHAN_IO_EFD_W0x08) != 0) |
| 2454 | pfd[p].events |= POLLOUT0x0004; |
| 2455 | /* rfd == sock */ |
| 2456 | if (c->sock == c->rfd && |
| 2457 | (c->io_want & SSH_CHAN_IO_SOCK_R0x10) != 0) |
| 2458 | pfd[p].events |= POLLIN0x0001; |
| 2459 | if (c->sock == c->rfd && |
| 2460 | (c->io_want & SSH_CHAN_IO_SOCK_W0x20) != 0) |
| 2461 | pfd[p].events |= POLLOUT0x0004; |
| 2462 | dump_channel_poll(__func__, "rfd", c, p, &pfd[p]); |
| 2463 | p++; |
| 2464 | } |
| 2465 | /* prepare c->wfd (if not already handled above) */ |
| 2466 | if (c->wfd != -1 && c->rfd != c->wfd) { |
| 2467 | if (c->pollfd_offset == -1) |
| 2468 | c->pollfd_offset = p; |
| 2469 | pfd[p].fd = c->wfd; |
| 2470 | pfd[p].events = 0; |
| 2471 | if ((c->io_want & SSH_CHAN_IO_WFD0x02) != 0) |
| 2472 | pfd[p].events = POLLOUT0x0004; |
| 2473 | dump_channel_poll(__func__, "wfd", c, p, &pfd[p]); |
| 2474 | p++; |
| 2475 | } |
| 2476 | /* prepare c->efd (if not already handled above) */ |
| 2477 | if (c->efd != -1 && c->rfd != c->efd) { |
| 2478 | if (c->pollfd_offset == -1) |
| 2479 | c->pollfd_offset = p; |
| 2480 | pfd[p].fd = c->efd; |
| 2481 | pfd[p].events = 0; |
| 2482 | if ((c->io_want & SSH_CHAN_IO_EFD_R0x04) != 0) |
| 2483 | pfd[p].events |= POLLIN0x0001; |
| 2484 | if ((c->io_want & SSH_CHAN_IO_EFD_W0x08) != 0) |
| 2485 | pfd[p].events |= POLLOUT0x0004; |
| 2486 | dump_channel_poll(__func__, "efd", c, p, &pfd[p]); |
| 2487 | p++; |
| 2488 | } |
| 2489 | /* prepare c->sock (if not already handled above) */ |
| 2490 | if (c->sock != -1 && c->rfd != c->sock) { |
| 2491 | if (c->pollfd_offset == -1) |
| 2492 | c->pollfd_offset = p; |
| 2493 | pfd[p].fd = c->sock; |
| 2494 | pfd[p].events = 0; |
| 2495 | if ((c->io_want & SSH_CHAN_IO_SOCK_R0x10) != 0) |
| 2496 | pfd[p].events |= POLLIN0x0001; |
| 2497 | if ((c->io_want & SSH_CHAN_IO_SOCK_W0x20) != 0) |
| 2498 | pfd[p].events |= POLLOUT0x0004; |
| 2499 | dump_channel_poll(__func__, "sock", c, p, &pfd[p]); |
| 2500 | p++; |
| 2501 | } |
| 2502 | *next_pollfd = p; |
| 2503 | } |
| 2504 | |
| 2505 | /* * Allocate/prepare poll structure */ |
| 2506 | void |
| 2507 | channel_prepare_poll(struct ssh *ssh, struct pollfd **pfdp, u_int *npfd_allocp, |
| 2508 | u_int *npfd_activep, u_int npfd_reserved, time_t *minwait_secs) |
| 2509 | { |
| 2510 | struct ssh_channels *sc = ssh->chanctxt; |
| 2511 | u_int i, oalloc, p, npfd = npfd_reserved; |
| 2512 | |
| 2513 | channel_before_prepare_io(ssh); /* might create a new channel */ |
| 2514 | |
| 2515 | /* Allocate 4x pollfd for each channel (rfd, wfd, efd, sock) */ |
| 2516 | if (sc->channels_alloc >= (INT_MAX2147483647 / 4) - npfd_reserved) |
| 2517 | fatal_f("too many channels")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2517 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "too many channels"); /* shouldn't happen */ |
| 2518 | if (!ssh_packet_is_rekeying(ssh)) |
| 2519 | npfd += sc->channels_alloc * 4; |
| 2520 | if (npfd > *npfd_allocp) { |
| 2521 | *pfdp = xrecallocarray(*pfdp, *npfd_allocp, |
| 2522 | npfd, sizeof(**pfdp)); |
| 2523 | *npfd_allocp = npfd; |
| 2524 | } |
| 2525 | *npfd_activep = npfd_reserved; |
| 2526 | if (ssh_packet_is_rekeying(ssh)) |
| 2527 | return; |
| 2528 | |
| 2529 | oalloc = sc->channels_alloc; |
| 2530 | |
| 2531 | channel_handler(ssh, CHAN_PRE, minwait_secs); |
| 2532 | |
| 2533 | if (oalloc != sc->channels_alloc) { |
| 2534 | /* shouldn't happen */ |
| 2535 | fatal_f("channels_alloc changed during CHAN_PRE "sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2536 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channels_alloc changed during CHAN_PRE " "(was %u, now %u)", oalloc, sc->channels_alloc) |
| 2536 | "(was %u, now %u)", oalloc, sc->channels_alloc)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2536 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channels_alloc changed during CHAN_PRE " "(was %u, now %u)", oalloc, sc->channels_alloc); |
| 2537 | } |
| 2538 | |
| 2539 | /* Prepare pollfd */ |
| 2540 | p = npfd_reserved; |
| 2541 | for (i = 0; i < sc->channels_alloc; i++) |
| 2542 | channel_prepare_pollfd(sc->channels[i], &p, *pfdp, npfd); |
| 2543 | *npfd_activep = p; |
| 2544 | } |
| 2545 | |
| 2546 | static void |
| 2547 | fd_ready(Channel *c, u_int p, struct pollfd *pfds, int fd, |
| 2548 | const char *what, u_int revents_mask, u_int ready) |
| 2549 | { |
| 2550 | struct pollfd *pfd = &pfds[p]; |
| 2551 | |
| 2552 | if (fd == -1) |
| 2553 | return; |
| 2554 | dump_channel_poll(__func__, what, c, p, pfd); |
| 2555 | if (pfd->fd != fd) { |
| 2556 | fatal("channel %d: inconsistent %s fd=%d pollfd[%u].fd %d "sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2558 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: inconsistent %s fd=%d pollfd[%u].fd %d " "r%d w%d e%d s%d", c->self, what, fd, p, pfd->fd, c-> rfd, c->wfd, c->efd, c->sock) |
| 2557 | "r%d w%d e%d s%d", c->self, what, fd, p, pfd->fd,sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2558 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: inconsistent %s fd=%d pollfd[%u].fd %d " "r%d w%d e%d s%d", c->self, what, fd, p, pfd->fd, c-> rfd, c->wfd, c->efd, c->sock) |
| 2558 | c->rfd, c->wfd, c->efd, c->sock)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2558 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: inconsistent %s fd=%d pollfd[%u].fd %d " "r%d w%d e%d s%d", c->self, what, fd, p, pfd->fd, c-> rfd, c->wfd, c->efd, c->sock); |
| 2559 | } |
| 2560 | if ((pfd->revents & POLLNVAL0x0020) != 0) { |
| 2561 | fatal("channel %d: invalid %s pollfd[%u].fd %d r%d w%d e%d s%d",sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2562 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: invalid %s pollfd[%u].fd %d r%d w%d e%d s%d" , c->self, what, p, pfd->fd, c->rfd, c->wfd, c-> efd, c->sock) |
| 2562 | c->self, what, p, pfd->fd, c->rfd, c->wfd, c->efd, c->sock)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2562 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: invalid %s pollfd[%u].fd %d r%d w%d e%d s%d" , c->self, what, p, pfd->fd, c->rfd, c->wfd, c-> efd, c->sock); |
| 2563 | } |
| 2564 | if ((pfd->revents & (revents_mask|POLLHUP0x0010|POLLERR0x0008)) != 0) |
| 2565 | c->io_ready |= ready & c->io_want; |
| 2566 | } |
| 2567 | |
| 2568 | /* |
| 2569 | * After poll, perform any appropriate operations for channels which have |
| 2570 | * events pending. |
| 2571 | */ |
| 2572 | void |
| 2573 | channel_after_poll(struct ssh *ssh, struct pollfd *pfd, u_int npfd) |
| 2574 | { |
| 2575 | struct ssh_channels *sc = ssh->chanctxt; |
| 2576 | u_int i, p; |
| 2577 | Channel *c; |
| 2578 | |
| 2579 | #ifdef DEBUG_CHANNEL_POLL |
| 2580 | for (p = 0; p < npfd; p++) { |
| 2581 | if (pfd[p].revents == 0) |
| 2582 | continue; |
| 2583 | debug_f("pfd[%u].fd %d rev 0x%04x",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2584 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pfd[%u].fd %d rev 0x%04x" , p, pfd[p].fd, pfd[p].revents) |
| 2584 | p, pfd[p].fd, pfd[p].revents)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2584 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pfd[%u].fd %d rev 0x%04x" , p, pfd[p].fd, pfd[p].revents); |
| 2585 | } |
| 2586 | #endif |
| 2587 | |
| 2588 | /* Convert pollfd into c->io_ready */ |
| 2589 | for (i = 0; i < sc->channels_alloc; i++) { |
| 2590 | c = sc->channels[i]; |
| 2591 | if (c == NULL((void *)0) || c->pollfd_offset < 0) |
| 2592 | continue; |
| 2593 | if ((u_int)c->pollfd_offset >= npfd) { |
| 2594 | /* shouldn't happen */ |
| 2595 | fatal_f("channel %d: (before) bad pfd %u (max %u)",sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2596 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: (before) bad pfd %u (max %u)" , c->self, c->pollfd_offset, npfd) |
| 2596 | c->self, c->pollfd_offset, npfd)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2596 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: (before) bad pfd %u (max %u)" , c->self, c->pollfd_offset, npfd); |
| 2597 | } |
| 2598 | /* if rfd is shared with efd/sock then wfd should be too */ |
| 2599 | if (c->rfd != -1 && c->wfd != -1 && c->rfd != c->wfd && |
| 2600 | (c->rfd == c->efd || c->rfd == c->sock)) { |
| 2601 | /* Shouldn't happen */ |
| 2602 | fatal_f("channel %d: unexpected fds r%d w%d e%d s%d",sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2603 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: unexpected fds r%d w%d e%d s%d" , c->self, c->rfd, c->wfd, c->efd, c->sock) |
| 2603 | c->self, c->rfd, c->wfd, c->efd, c->sock)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2603 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: unexpected fds r%d w%d e%d s%d" , c->self, c->rfd, c->wfd, c->efd, c->sock); |
| 2604 | } |
| 2605 | c->io_ready = 0; |
| 2606 | p = c->pollfd_offset; |
| 2607 | /* rfd, potentially shared with wfd, efd and sock */ |
| 2608 | if (c->rfd != -1) { |
| 2609 | fd_ready(c, p, pfd, c->rfd, "rfd", POLLIN0x0001, |
| 2610 | SSH_CHAN_IO_RFD0x01); |
| 2611 | if (c->rfd == c->wfd) { |
| 2612 | fd_ready(c, p, pfd, c->wfd, "wfd/r", POLLOUT0x0004, |
| 2613 | SSH_CHAN_IO_WFD0x02); |
| 2614 | } |
| 2615 | if (c->rfd == c->efd) { |
| 2616 | fd_ready(c, p, pfd, c->efd, "efdr/r", POLLIN0x0001, |
| 2617 | SSH_CHAN_IO_EFD_R0x04); |
| 2618 | fd_ready(c, p, pfd, c->efd, "efdw/r", POLLOUT0x0004, |
| 2619 | SSH_CHAN_IO_EFD_W0x08); |
| 2620 | } |
| 2621 | if (c->rfd == c->sock) { |
| 2622 | fd_ready(c, p, pfd, c->sock, "sockr/r", POLLIN0x0001, |
| 2623 | SSH_CHAN_IO_SOCK_R0x10); |
| 2624 | fd_ready(c, p, pfd, c->sock, "sockw/r", POLLOUT0x0004, |
| 2625 | SSH_CHAN_IO_SOCK_W0x20); |
| 2626 | } |
| 2627 | p++; |
| 2628 | } |
| 2629 | /* wfd */ |
| 2630 | if (c->wfd != -1 && c->wfd != c->rfd) { |
| 2631 | fd_ready(c, p, pfd, c->wfd, "wfd", POLLOUT0x0004, |
| 2632 | SSH_CHAN_IO_WFD0x02); |
| 2633 | p++; |
| 2634 | } |
| 2635 | /* efd */ |
| 2636 | if (c->efd != -1 && c->efd != c->rfd) { |
| 2637 | fd_ready(c, p, pfd, c->efd, "efdr", POLLIN0x0001, |
| 2638 | SSH_CHAN_IO_EFD_R0x04); |
| 2639 | fd_ready(c, p, pfd, c->efd, "efdw", POLLOUT0x0004, |
| 2640 | SSH_CHAN_IO_EFD_W0x08); |
| 2641 | p++; |
| 2642 | } |
| 2643 | /* sock */ |
| 2644 | if (c->sock != -1 && c->sock != c->rfd) { |
| 2645 | fd_ready(c, p, pfd, c->sock, "sockr", POLLIN0x0001, |
| 2646 | SSH_CHAN_IO_SOCK_R0x10); |
| 2647 | fd_ready(c, p, pfd, c->sock, "sockw", POLLOUT0x0004, |
| 2648 | SSH_CHAN_IO_SOCK_W0x20); |
| 2649 | p++; |
| 2650 | } |
| 2651 | |
| 2652 | if (p > npfd) { |
| 2653 | /* shouldn't happen */ |
| 2654 | fatal_f("channel %d: (after) bad pfd %u (max %u)",sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2655 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: (after) bad pfd %u (max %u)" , c->self, c->pollfd_offset, npfd) |
| 2655 | c->self, c->pollfd_offset, npfd)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2655 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: (after) bad pfd %u (max %u)" , c->self, c->pollfd_offset, npfd); |
| 2656 | } |
| 2657 | } |
| 2658 | channel_handler(ssh, CHAN_POST, NULL((void *)0)); |
| 2659 | } |
| 2660 | |
| 2661 | /* |
| 2662 | * Enqueue data for channels with open or draining c->input. |
| 2663 | */ |
| 2664 | static void |
| 2665 | channel_output_poll_input_open(struct ssh *ssh, Channel *c) |
| 2666 | { |
| 2667 | size_t len, plen; |
| 2668 | const u_char *pkt; |
| 2669 | int r; |
| 2670 | |
| 2671 | if ((len = sshbuf_len(c->input)) == 0) { |
| 2672 | if (c->istate == CHAN_INPUT_WAIT_DRAIN1) { |
| 2673 | /* |
| 2674 | * input-buffer is empty and read-socket shutdown: |
| 2675 | * tell peer, that we will not send more data: |
| 2676 | * send IEOF. |
| 2677 | * hack for extended data: delay EOF if EFD still |
| 2678 | * in use. |
| 2679 | */ |
| 2680 | if (CHANNEL_EFD_INPUT_ACTIVE(c)(c->extended_usage == 1 && (c->efd != -1 || sshbuf_len (c->extended) > 0))) |
| 2681 | debug2("channel %d: "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2683 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: " "ibuf_empty delayed efd %d/(%zu)" , c->self, c->efd, sshbuf_len(c->extended)) |
| 2682 | "ibuf_empty delayed efd %d/(%zu)",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2683 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: " "ibuf_empty delayed efd %d/(%zu)" , c->self, c->efd, sshbuf_len(c->extended)) |
| 2683 | c->self, c->efd, sshbuf_len(c->extended))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2683 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: " "ibuf_empty delayed efd %d/(%zu)" , c->self, c->efd, sshbuf_len(c->extended)); |
| 2684 | else |
| 2685 | chan_ibuf_empty(ssh, c); |
| 2686 | } |
| 2687 | return; |
| 2688 | } |
| 2689 | |
| 2690 | if (!c->have_remote_id) |
| 2691 | fatal_f("channel %d: no remote id", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2691 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: no remote id" , c->self); |
| 2692 | |
| 2693 | if (c->datagram) { |
| 2694 | /* Check datagram will fit; drop if not */ |
| 2695 | if ((r = sshbuf_get_string_direct(c->input, &pkt, &plen)) != 0) |
| 2696 | fatal_fr(r, "channel %i: get datagram", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2696 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: get datagram" , c->self); |
| 2697 | /* |
| 2698 | * XXX this does tail-drop on the datagram queue which is |
| 2699 | * usually suboptimal compared to head-drop. Better to have |
| 2700 | * backpressure at read time? (i.e. read + discard) |
| 2701 | */ |
| 2702 | if (plen > c->remote_window || plen > c->remote_maxpacket) { |
| 2703 | debug("channel %d: datagram too big", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2703 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: datagram too big" , c->self); |
| 2704 | return; |
| 2705 | } |
| 2706 | /* Enqueue it */ |
| 2707 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA94)) != 0 || |
| 2708 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 2709 | (r = sshpkt_put_string(ssh, pkt, plen)) != 0 || |
| 2710 | (r = sshpkt_send(ssh)) != 0) |
| 2711 | fatal_fr(r, "channel %i: send datagram", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2711 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: send datagram" , c->self); |
| 2712 | c->remote_window -= plen; |
| 2713 | return; |
| 2714 | } |
| 2715 | |
| 2716 | /* Enqueue packet for buffered data. */ |
| 2717 | if (len > c->remote_window) |
| 2718 | len = c->remote_window; |
| 2719 | if (len > c->remote_maxpacket) |
| 2720 | len = c->remote_maxpacket; |
| 2721 | if (len == 0) |
| 2722 | return; |
| 2723 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA94)) != 0 || |
| 2724 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 2725 | (r = sshpkt_put_string(ssh, sshbuf_ptr(c->input), len)) != 0 || |
| 2726 | (r = sshpkt_send(ssh)) != 0) |
| 2727 | fatal_fr(r, "channel %i: send data", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2727 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: send data", c->self); |
| 2728 | if ((r = sshbuf_consume(c->input, len)) != 0) |
| 2729 | fatal_fr(r, "channel %i: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2729 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: consume", c ->self); |
| 2730 | c->remote_window -= len; |
| 2731 | } |
| 2732 | |
| 2733 | /* |
| 2734 | * Enqueue data for channels with open c->extended in read mode. |
| 2735 | */ |
| 2736 | static void |
| 2737 | channel_output_poll_extended_read(struct ssh *ssh, Channel *c) |
| 2738 | { |
| 2739 | size_t len; |
| 2740 | int r; |
| 2741 | |
| 2742 | if ((len = sshbuf_len(c->extended)) == 0) |
| 2743 | return; |
| 2744 | |
| 2745 | debug2("channel %d: rwin %u elen %zu euse %d", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2746 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: rwin %u elen %zu euse %d" , c->self, c->remote_window, sshbuf_len(c->extended) , c->extended_usage) |
| 2746 | c->remote_window, sshbuf_len(c->extended), c->extended_usage)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2746 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: rwin %u elen %zu euse %d" , c->self, c->remote_window, sshbuf_len(c->extended) , c->extended_usage); |
| 2747 | if (len > c->remote_window) |
| 2748 | len = c->remote_window; |
| 2749 | if (len > c->remote_maxpacket) |
| 2750 | len = c->remote_maxpacket; |
| 2751 | if (len == 0) |
| 2752 | return; |
| 2753 | if (!c->have_remote_id) |
| 2754 | fatal_f("channel %d: no remote id", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2754 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: no remote id" , c->self); |
| 2755 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA95)) != 0 || |
| 2756 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 2757 | (r = sshpkt_put_u32(ssh, SSH2_EXTENDED_DATA_STDERR1)) != 0 || |
| 2758 | (r = sshpkt_put_string(ssh, sshbuf_ptr(c->extended), len)) != 0 || |
| 2759 | (r = sshpkt_send(ssh)) != 0) |
| 2760 | fatal_fr(r, "channel %i: data", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2760 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: data", c-> self); |
| 2761 | if ((r = sshbuf_consume(c->extended, len)) != 0) |
| 2762 | fatal_fr(r, "channel %i: consume", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2762 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: consume", c ->self); |
| 2763 | c->remote_window -= len; |
| 2764 | debug2("channel %d: sent ext data %zu", c->self, len)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2764 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: sent ext data %zu" , c->self, len); |
| 2765 | } |
| 2766 | |
| 2767 | /* If there is data to send to the connection, enqueue some of it now. */ |
| 2768 | void |
| 2769 | channel_output_poll(struct ssh *ssh) |
| 2770 | { |
| 2771 | struct ssh_channels *sc = ssh->chanctxt; |
| 2772 | Channel *c; |
| 2773 | u_int i; |
| 2774 | |
| 2775 | for (i = 0; i < sc->channels_alloc; i++) { |
| 2776 | c = sc->channels[i]; |
| 2777 | if (c == NULL((void *)0)) |
| 2778 | continue; |
| 2779 | |
| 2780 | /* |
| 2781 | * We are only interested in channels that can have buffered |
| 2782 | * incoming data. |
| 2783 | */ |
| 2784 | if (c->type != SSH_CHANNEL_OPEN4) |
| 2785 | continue; |
| 2786 | if ((c->flags & (CHAN_CLOSE_SENT0x01|CHAN_CLOSE_RCVD0x02))) { |
| 2787 | /* XXX is this true? */ |
| 2788 | debug3("channel %d: will not send data after close",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2789 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: will not send data after close" , c->self) |
| 2789 | c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2789 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: will not send data after close" , c->self); |
| 2790 | continue; |
| 2791 | } |
| 2792 | |
| 2793 | /* Get the amount of buffered data for this channel. */ |
| 2794 | if (c->istate == CHAN_INPUT_OPEN0 || |
| 2795 | c->istate == CHAN_INPUT_WAIT_DRAIN1) |
| 2796 | channel_output_poll_input_open(ssh, c); |
| 2797 | /* Send extended data, i.e. stderr */ |
| 2798 | if (!(c->flags & CHAN_EOF_SENT0x04) && |
| 2799 | c->extended_usage == CHAN_EXTENDED_READ1) |
| 2800 | channel_output_poll_extended_read(ssh, c); |
| 2801 | } |
| 2802 | } |
| 2803 | |
| 2804 | /* -- mux proxy support */ |
| 2805 | |
| 2806 | /* |
| 2807 | * When multiplexing channel messages for mux clients we have to deal |
| 2808 | * with downstream messages from the mux client and upstream messages |
| 2809 | * from the ssh server: |
| 2810 | * 1) Handling downstream messages is straightforward and happens |
| 2811 | * in channel_proxy_downstream(): |
| 2812 | * - We forward all messages (mostly) unmodified to the server. |
| 2813 | * - However, in order to route messages from upstream to the correct |
| 2814 | * downstream client, we have to replace the channel IDs used by the |
| 2815 | * mux clients with a unique channel ID because the mux clients might |
| 2816 | * use conflicting channel IDs. |
| 2817 | * - so we inspect and change both SSH2_MSG_CHANNEL_OPEN and |
| 2818 | * SSH2_MSG_CHANNEL_OPEN_CONFIRMATION messages, create a local |
| 2819 | * SSH_CHANNEL_MUX_PROXY channel and replace the mux clients ID |
| 2820 | * with the newly allocated channel ID. |
| 2821 | * 2) Upstream messages are received by matching SSH_CHANNEL_MUX_PROXY |
| 2822 | * channels and processed by channel_proxy_upstream(). The local channel ID |
| 2823 | * is then translated back to the original mux client ID. |
| 2824 | * 3) In both cases we need to keep track of matching SSH2_MSG_CHANNEL_CLOSE |
| 2825 | * messages so we can clean up SSH_CHANNEL_MUX_PROXY channels. |
| 2826 | * 4) The SSH_CHANNEL_MUX_PROXY channels also need to closed when the |
| 2827 | * downstream mux client are removed. |
| 2828 | * 5) Handling SSH2_MSG_CHANNEL_OPEN messages from the upstream server |
| 2829 | * requires more work, because they are not addressed to a specific |
| 2830 | * channel. E.g. client_request_forwarded_tcpip() needs to figure |
| 2831 | * out whether the request is addressed to the local client or a |
| 2832 | * specific downstream client based on the listen-address/port. |
| 2833 | * 6) Agent and X11-Forwarding have a similar problem and are currently |
| 2834 | * not supported as the matching session/channel cannot be identified |
| 2835 | * easily. |
| 2836 | */ |
| 2837 | |
| 2838 | /* |
| 2839 | * receive packets from downstream mux clients: |
| 2840 | * channel callback fired on read from mux client, creates |
| 2841 | * SSH_CHANNEL_MUX_PROXY channels and translates channel IDs |
| 2842 | * on channel creation. |
| 2843 | */ |
| 2844 | int |
| 2845 | channel_proxy_downstream(struct ssh *ssh, Channel *downstream) |
| 2846 | { |
| 2847 | Channel *c = NULL((void *)0); |
| 2848 | struct sshbuf *original = NULL((void *)0), *modified = NULL((void *)0); |
| 2849 | const u_char *cp; |
| 2850 | char *ctype = NULL((void *)0), *listen_host = NULL((void *)0); |
| 2851 | u_char type; |
| 2852 | size_t have; |
| 2853 | int ret = -1, r; |
| 2854 | u_int id, remote_id, listen_port; |
| 2855 | |
| 2856 | /* sshbuf_dump(downstream->input, stderr); */ |
| 2857 | if ((r = sshbuf_get_string_direct(downstream->input, &cp, &have)) |
| 2858 | != 0) { |
| 2859 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2859 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 2860 | return -1; |
| 2861 | } |
| 2862 | if (have < 2) { |
| 2863 | error_f("short message")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2863 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "short message"); |
| 2864 | return -1; |
| 2865 | } |
| 2866 | type = cp[1]; |
| 2867 | /* skip padlen + type */ |
| 2868 | cp += 2; |
| 2869 | have -= 2; |
| 2870 | if (ssh_packet_log_type(type)) |
| 2871 | debug3_f("channel %u: down->up: type %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2872 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %u: down->up: type %u" , downstream->self, type) |
| 2872 | downstream->self, type)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2872 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %u: down->up: type %u" , downstream->self, type); |
| 2873 | |
| 2874 | switch (type) { |
| 2875 | case SSH2_MSG_CHANNEL_OPEN90: |
| 2876 | if ((original = sshbuf_from(cp, have)) == NULL((void *)0) || |
| 2877 | (modified = sshbuf_new()) == NULL((void *)0)) { |
| 2878 | error_f("alloc")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2878 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "alloc"); |
| 2879 | goto out; |
| 2880 | } |
| 2881 | if ((r = sshbuf_get_cstring(original, &ctype, NULL((void *)0))) != 0 || |
| 2882 | (r = sshbuf_get_u32(original, &id)) != 0) { |
| 2883 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2883 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 2884 | goto out; |
| 2885 | } |
| 2886 | c = channel_new(ssh, "mux proxy", SSH_CHANNEL_MUX_PROXY20, |
| 2887 | -1, -1, -1, 0, 0, 0, ctype, 1); |
| 2888 | c->mux_ctx = downstream; /* point to mux client */ |
| 2889 | c->mux_downstream_id = id; /* original downstream id */ |
| 2890 | if ((r = sshbuf_put_cstring(modified, ctype)) != 0 || |
| 2891 | (r = sshbuf_put_u32(modified, c->self)) != 0 || |
| 2892 | (r = sshbuf_putb(modified, original)) != 0) { |
| 2893 | error_fr(r, "compose")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2893 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "compose"); |
| 2894 | channel_free(ssh, c); |
| 2895 | goto out; |
| 2896 | } |
| 2897 | break; |
| 2898 | case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION91: |
| 2899 | /* |
| 2900 | * Almost the same as SSH2_MSG_CHANNEL_OPEN, except then we |
| 2901 | * need to parse 'remote_id' instead of 'ctype'. |
| 2902 | */ |
| 2903 | if ((original = sshbuf_from(cp, have)) == NULL((void *)0) || |
| 2904 | (modified = sshbuf_new()) == NULL((void *)0)) { |
| 2905 | error_f("alloc")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2905 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "alloc"); |
| 2906 | goto out; |
| 2907 | } |
| 2908 | if ((r = sshbuf_get_u32(original, &remote_id)) != 0 || |
| 2909 | (r = sshbuf_get_u32(original, &id)) != 0) { |
| 2910 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2910 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 2911 | goto out; |
| 2912 | } |
| 2913 | c = channel_new(ssh, "mux proxy", SSH_CHANNEL_MUX_PROXY20, |
| 2914 | -1, -1, -1, 0, 0, 0, "mux-down-connect", 1); |
| 2915 | c->mux_ctx = downstream; /* point to mux client */ |
| 2916 | c->mux_downstream_id = id; |
| 2917 | c->remote_id = remote_id; |
| 2918 | c->have_remote_id = 1; |
| 2919 | if ((r = sshbuf_put_u32(modified, remote_id)) != 0 || |
| 2920 | (r = sshbuf_put_u32(modified, c->self)) != 0 || |
| 2921 | (r = sshbuf_putb(modified, original)) != 0) { |
| 2922 | error_fr(r, "compose")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2922 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "compose"); |
| 2923 | channel_free(ssh, c); |
| 2924 | goto out; |
| 2925 | } |
| 2926 | break; |
| 2927 | case SSH2_MSG_GLOBAL_REQUEST80: |
| 2928 | if ((original = sshbuf_from(cp, have)) == NULL((void *)0)) { |
| 2929 | error_f("alloc")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2929 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "alloc"); |
| 2930 | goto out; |
| 2931 | } |
| 2932 | if ((r = sshbuf_get_cstring(original, &ctype, NULL((void *)0))) != 0) { |
| 2933 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2933 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 2934 | goto out; |
| 2935 | } |
| 2936 | if (strcmp(ctype, "tcpip-forward") != 0) { |
| 2937 | error_f("unsupported request %s", ctype)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2937 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "unsupported request %s" , ctype); |
| 2938 | goto out; |
| 2939 | } |
| 2940 | if ((r = sshbuf_get_u8(original, NULL((void *)0))) != 0 || |
| 2941 | (r = sshbuf_get_cstring(original, &listen_host, NULL((void *)0))) != 0 || |
| 2942 | (r = sshbuf_get_u32(original, &listen_port)) != 0) { |
| 2943 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2943 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 2944 | goto out; |
| 2945 | } |
| 2946 | if (listen_port > 65535) { |
| 2947 | error_f("tcpip-forward for %s: bad port %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2948 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "tcpip-forward for %s: bad port %u" , listen_host, listen_port) |
| 2948 | listen_host, listen_port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2948 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "tcpip-forward for %s: bad port %u" , listen_host, listen_port); |
| 2949 | goto out; |
| 2950 | } |
| 2951 | /* Record that connection to this host/port is permitted. */ |
| 2952 | permission_set_add(ssh, FORWARD_USER0x101, FORWARD_LOCAL(1<<1), "<mux>", -1, |
| 2953 | listen_host, NULL((void *)0), (int)listen_port, downstream); |
| 2954 | listen_host = NULL((void *)0); |
| 2955 | break; |
| 2956 | case SSH2_MSG_CHANNEL_CLOSE97: |
| 2957 | if (have < 4) |
| 2958 | break; |
| 2959 | remote_id = PEEK_U32(cp)(((u_int32_t)(((const u_char *)(cp))[0]) << 24) | ((u_int32_t )(((const u_char *)(cp))[1]) << 16) | ((u_int32_t)(((const u_char *)(cp))[2]) << 8) | (u_int32_t)(((const u_char * )(cp))[3])); |
| 2960 | if ((c = channel_by_remote_id(ssh, remote_id)) != NULL((void *)0)) { |
| 2961 | if (c->flags & CHAN_CLOSE_RCVD0x02) |
| 2962 | channel_free(ssh, c); |
| 2963 | else |
| 2964 | c->flags |= CHAN_CLOSE_SENT0x01; |
| 2965 | } |
| 2966 | break; |
| 2967 | } |
| 2968 | if (modified) { |
| 2969 | if ((r = sshpkt_start(ssh, type)) != 0 || |
| 2970 | (r = sshpkt_putb(ssh, modified)) != 0 || |
| 2971 | (r = sshpkt_send(ssh)) != 0) { |
| 2972 | error_fr(r, "send")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2972 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "send"); |
| 2973 | goto out; |
| 2974 | } |
| 2975 | } else { |
| 2976 | if ((r = sshpkt_start(ssh, type)) != 0 || |
| 2977 | (r = sshpkt_put(ssh, cp, have)) != 0 || |
| 2978 | (r = sshpkt_send(ssh)) != 0) { |
| 2979 | error_fr(r, "send")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 2979 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "send"); |
| 2980 | goto out; |
| 2981 | } |
| 2982 | } |
| 2983 | ret = 0; |
| 2984 | out: |
| 2985 | free(ctype); |
| 2986 | free(listen_host); |
| 2987 | sshbuf_free(original); |
| 2988 | sshbuf_free(modified); |
| 2989 | return ret; |
| 2990 | } |
| 2991 | |
| 2992 | /* |
| 2993 | * receive packets from upstream server and de-multiplex packets |
| 2994 | * to correct downstream: |
| 2995 | * implemented as a helper for channel input handlers, |
| 2996 | * replaces local (proxy) channel ID with downstream channel ID. |
| 2997 | */ |
| 2998 | int |
| 2999 | channel_proxy_upstream(Channel *c, int type, u_int32_t seq, struct ssh *ssh) |
| 3000 | { |
| 3001 | struct sshbuf *b = NULL((void *)0); |
| 3002 | Channel *downstream; |
| 3003 | const u_char *cp = NULL((void *)0); |
| 3004 | size_t len; |
| 3005 | int r; |
| 3006 | |
| 3007 | /* |
| 3008 | * When receiving packets from the peer we need to check whether we |
| 3009 | * need to forward the packets to the mux client. In this case we |
| 3010 | * restore the original channel id and keep track of CLOSE messages, |
| 3011 | * so we can cleanup the channel. |
| 3012 | */ |
| 3013 | if (c == NULL((void *)0) || c->type != SSH_CHANNEL_MUX_PROXY20) |
| 3014 | return 0; |
| 3015 | if ((downstream = c->mux_ctx) == NULL((void *)0)) |
| 3016 | return 0; |
| 3017 | switch (type) { |
| 3018 | case SSH2_MSG_CHANNEL_CLOSE97: |
| 3019 | case SSH2_MSG_CHANNEL_DATA94: |
| 3020 | case SSH2_MSG_CHANNEL_EOF96: |
| 3021 | case SSH2_MSG_CHANNEL_EXTENDED_DATA95: |
| 3022 | case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION91: |
| 3023 | case SSH2_MSG_CHANNEL_OPEN_FAILURE92: |
| 3024 | case SSH2_MSG_CHANNEL_WINDOW_ADJUST93: |
| 3025 | case SSH2_MSG_CHANNEL_SUCCESS99: |
| 3026 | case SSH2_MSG_CHANNEL_FAILURE100: |
| 3027 | case SSH2_MSG_CHANNEL_REQUEST98: |
| 3028 | break; |
| 3029 | default: |
| 3030 | debug2_f("channel %u: unsupported type %u", c->self, type)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3030 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %u: unsupported type %u" , c->self, type); |
| 3031 | return 0; |
| 3032 | } |
| 3033 | if ((b = sshbuf_new()) == NULL((void *)0)) { |
| 3034 | error_f("alloc reply")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3034 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "alloc reply"); |
| 3035 | goto out; |
| 3036 | } |
| 3037 | /* get remaining payload (after id) */ |
| 3038 | cp = sshpkt_ptr(ssh, &len); |
| 3039 | if (cp == NULL((void *)0)) { |
| 3040 | error_f("no packet")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3040 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "no packet"); |
| 3041 | goto out; |
| 3042 | } |
| 3043 | /* translate id and send to muxclient */ |
| 3044 | if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */ |
| 3045 | (r = sshbuf_put_u8(b, type)) != 0 || |
| 3046 | (r = sshbuf_put_u32(b, c->mux_downstream_id)) != 0 || |
| 3047 | (r = sshbuf_put(b, cp, len)) != 0 || |
| 3048 | (r = sshbuf_put_stringb(downstream->output, b)) != 0) { |
| 3049 | error_fr(r, "compose muxclient")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3049 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "compose muxclient"); |
| 3050 | goto out; |
| 3051 | } |
| 3052 | /* sshbuf_dump(b, stderr); */ |
| 3053 | if (ssh_packet_log_type(type)) |
| 3054 | debug3_f("channel %u: up->down: type %u", c->self, type)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3054 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %u: up->down: type %u" , c->self, type); |
| 3055 | out: |
| 3056 | /* update state */ |
| 3057 | switch (type) { |
| 3058 | case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION91: |
| 3059 | /* record remote_id for SSH2_MSG_CHANNEL_CLOSE */ |
| 3060 | if (cp && len > 4) { |
| 3061 | c->remote_id = PEEK_U32(cp)(((u_int32_t)(((const u_char *)(cp))[0]) << 24) | ((u_int32_t )(((const u_char *)(cp))[1]) << 16) | ((u_int32_t)(((const u_char *)(cp))[2]) << 8) | (u_int32_t)(((const u_char * )(cp))[3])); |
| 3062 | c->have_remote_id = 1; |
| 3063 | } |
| 3064 | break; |
| 3065 | case SSH2_MSG_CHANNEL_CLOSE97: |
| 3066 | if (c->flags & CHAN_CLOSE_SENT0x01) |
| 3067 | channel_free(ssh, c); |
| 3068 | else |
| 3069 | c->flags |= CHAN_CLOSE_RCVD0x02; |
| 3070 | break; |
| 3071 | } |
| 3072 | sshbuf_free(b); |
| 3073 | return 1; |
| 3074 | } |
| 3075 | |
| 3076 | /* -- protocol input */ |
| 3077 | |
| 3078 | /* Parse a channel ID from the current packet */ |
| 3079 | static int |
| 3080 | channel_parse_id(struct ssh *ssh, const char *where, const char *what) |
| 3081 | { |
| 3082 | u_int32_t id; |
| 3083 | int r; |
| 3084 | |
| 3085 | if ((r = sshpkt_get_u32(ssh, &id)) != 0) { |
| 3086 | error_r(r, "%s: parse id", where)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3086 , 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "%s: parse id", where); |
| 3087 | ssh_packet_disconnect(ssh, "Invalid %s message", what); |
| 3088 | } |
| 3089 | if (id > INT_MAX2147483647) { |
| 3090 | error_r(r, "%s: bad channel id %u", where, id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3090 , 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "%s: bad channel id %u", where, id); |
| 3091 | ssh_packet_disconnect(ssh, "Invalid %s channel id", what); |
| 3092 | } |
| 3093 | return (int)id; |
| 3094 | } |
| 3095 | |
| 3096 | /* Lookup a channel from an ID in the current packet */ |
| 3097 | static Channel * |
| 3098 | channel_from_packet_id(struct ssh *ssh, const char *where, const char *what) |
| 3099 | { |
| 3100 | int id = channel_parse_id(ssh, where, what); |
| 3101 | Channel *c; |
| 3102 | |
| 3103 | if ((c = channel_lookup(ssh, id)) == NULL((void *)0)) { |
| 3104 | ssh_packet_disconnect(ssh, |
| 3105 | "%s packet referred to nonexistent channel %d", what, id); |
| 3106 | } |
| 3107 | return c; |
| 3108 | } |
| 3109 | |
| 3110 | int |
| 3111 | channel_input_data(int type, u_int32_t seq, struct ssh *ssh) |
| 3112 | { |
| 3113 | const u_char *data; |
| 3114 | size_t data_len, win_len; |
| 3115 | Channel *c = channel_from_packet_id(ssh, __func__, "data"); |
| 3116 | int r; |
| 3117 | |
| 3118 | if (channel_proxy_upstream(c, type, seq, ssh)) |
| 3119 | return 0; |
| 3120 | |
| 3121 | /* Ignore any data for non-open channels (might happen on close) */ |
| 3122 | if (c->type != SSH_CHANNEL_OPEN4 && |
| 3123 | c->type != SSH_CHANNEL_RDYNAMIC_OPEN21 && |
| 3124 | c->type != SSH_CHANNEL_RDYNAMIC_FINISH22 && |
| 3125 | c->type != SSH_CHANNEL_X11_OPEN7) |
| 3126 | return 0; |
| 3127 | |
| 3128 | /* Get the data. */ |
| 3129 | if ((r = sshpkt_get_string_direct(ssh, &data, &data_len)) != 0 || |
| 3130 | (r = sshpkt_get_end(ssh)) != 0) |
| 3131 | fatal_fr(r, "channel %i: get data", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3131 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: get data", c ->self); |
| 3132 | |
| 3133 | win_len = data_len; |
| 3134 | if (c->datagram) |
| 3135 | win_len += 4; /* string length header */ |
| 3136 | |
| 3137 | /* |
| 3138 | * The sending side reduces its window as it sends data, so we |
| 3139 | * must 'fake' consumption of the data in order to ensure that window |
| 3140 | * updates are sent back. Otherwise the connection might deadlock. |
| 3141 | */ |
| 3142 | if (c->ostate != CHAN_OUTPUT_OPEN0) { |
| 3143 | c->local_window -= win_len; |
| 3144 | c->local_consumed += win_len; |
| 3145 | return 0; |
| 3146 | } |
| 3147 | |
| 3148 | if (win_len > c->local_maxpacket) { |
| 3149 | logit("channel %d: rcvd big packet %zu, maxpack %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3150 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: rcvd big packet %zu, maxpack %u" , c->self, win_len, c->local_maxpacket) |
| 3150 | c->self, win_len, c->local_maxpacket)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3150 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: rcvd big packet %zu, maxpack %u" , c->self, win_len, c->local_maxpacket); |
| 3151 | return 0; |
| 3152 | } |
| 3153 | if (win_len > c->local_window) { |
| 3154 | logit("channel %d: rcvd too much data %zu, win %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3155 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: rcvd too much data %zu, win %u" , c->self, win_len, c->local_window) |
| 3155 | c->self, win_len, c->local_window)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3155 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: rcvd too much data %zu, win %u" , c->self, win_len, c->local_window); |
| 3156 | return 0; |
| 3157 | } |
| 3158 | c->local_window -= win_len; |
| 3159 | |
| 3160 | if (c->datagram) { |
| 3161 | if ((r = sshbuf_put_string(c->output, data, data_len)) != 0) |
| 3162 | fatal_fr(r, "channel %i: append datagram", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3162 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: append datagram" , c->self); |
| 3163 | } else if ((r = sshbuf_put(c->output, data, data_len)) != 0) |
| 3164 | fatal_fr(r, "channel %i: append data", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3164 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i: append data" , c->self); |
| 3165 | |
| 3166 | return 0; |
| 3167 | } |
| 3168 | |
| 3169 | int |
| 3170 | channel_input_extended_data(int type, u_int32_t seq, struct ssh *ssh) |
| 3171 | { |
| 3172 | const u_char *data; |
| 3173 | size_t data_len; |
| 3174 | u_int32_t tcode; |
| 3175 | Channel *c = channel_from_packet_id(ssh, __func__, "extended data"); |
| 3176 | int r; |
| 3177 | |
| 3178 | if (channel_proxy_upstream(c, type, seq, ssh)) |
| 3179 | return 0; |
| 3180 | if (c->type != SSH_CHANNEL_OPEN4) { |
| 3181 | logit("channel %d: ext data for non open", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3181 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: ext data for non open" , c->self); |
| 3182 | return 0; |
| 3183 | } |
| 3184 | if (c->flags & CHAN_EOF_RCVD0x08) { |
| 3185 | if (ssh->compat & SSH_BUG_EXTEOF0x00200000) |
| 3186 | debug("channel %d: accepting ext data after eof",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3187 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: accepting ext data after eof" , c->self) |
| 3187 | c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3187 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: accepting ext data after eof" , c->self); |
| 3188 | else |
| 3189 | ssh_packet_disconnect(ssh, "Received extended_data " |
| 3190 | "after EOF on channel %d.", c->self); |
| 3191 | } |
| 3192 | |
| 3193 | if ((r = sshpkt_get_u32(ssh, &tcode)) != 0) { |
| 3194 | error_fr(r, "parse tcode")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3194 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse tcode"); |
| 3195 | ssh_packet_disconnect(ssh, "Invalid extended_data message"); |
| 3196 | } |
| 3197 | if (c->efd == -1 || |
| 3198 | c->extended_usage != CHAN_EXTENDED_WRITE2 || |
| 3199 | tcode != SSH2_EXTENDED_DATA_STDERR1) { |
| 3200 | logit("channel %d: bad ext data", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3200 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: bad ext data" , c->self); |
| 3201 | return 0; |
| 3202 | } |
| 3203 | if ((r = sshpkt_get_string_direct(ssh, &data, &data_len)) != 0 || |
| 3204 | (r = sshpkt_get_end(ssh)) != 0) { |
| 3205 | error_fr(r, "parse data")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3205 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse data"); |
| 3206 | ssh_packet_disconnect(ssh, "Invalid extended_data message"); |
| 3207 | } |
| 3208 | |
| 3209 | if (data_len > c->local_window) { |
| 3210 | logit("channel %d: rcvd too much extended_data %zu, win %u",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3211 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: rcvd too much extended_data %zu, win %u" , c->self, data_len, c->local_window) |
| 3211 | c->self, data_len, c->local_window)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3211 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: rcvd too much extended_data %zu, win %u" , c->self, data_len, c->local_window); |
| 3212 | return 0; |
| 3213 | } |
| 3214 | debug2("channel %d: rcvd ext data %zu", c->self, data_len)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3214 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: rcvd ext data %zu" , c->self, data_len); |
| 3215 | /* XXX sshpkt_getb? */ |
| 3216 | if ((r = sshbuf_put(c->extended, data, data_len)) != 0) |
| 3217 | error_fr(r, "append")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3217 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "append"); |
| 3218 | c->local_window -= data_len; |
| 3219 | return 0; |
| 3220 | } |
| 3221 | |
| 3222 | int |
| 3223 | channel_input_ieof(int type, u_int32_t seq, struct ssh *ssh) |
| 3224 | { |
| 3225 | Channel *c = channel_from_packet_id(ssh, __func__, "ieof"); |
| 3226 | int r; |
| 3227 | |
| 3228 | if ((r = sshpkt_get_end(ssh)) != 0) { |
| 3229 | error_fr(r, "parse data")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3229 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse data"); |
| 3230 | ssh_packet_disconnect(ssh, "Invalid ieof message"); |
| 3231 | } |
| 3232 | |
| 3233 | if (channel_proxy_upstream(c, type, seq, ssh)) |
| 3234 | return 0; |
| 3235 | chan_rcvd_ieof(ssh, c); |
| 3236 | |
| 3237 | /* XXX force input close */ |
| 3238 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN0) { |
| 3239 | debug("channel %d: FORCE input drain", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3239 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: FORCE input drain" , c->self); |
| 3240 | c->istate = CHAN_INPUT_WAIT_DRAIN1; |
| 3241 | if (sshbuf_len(c->input) == 0) |
| 3242 | chan_ibuf_empty(ssh, c); |
| 3243 | } |
| 3244 | return 0; |
| 3245 | } |
| 3246 | |
| 3247 | int |
| 3248 | channel_input_oclose(int type, u_int32_t seq, struct ssh *ssh) |
| 3249 | { |
| 3250 | Channel *c = channel_from_packet_id(ssh, __func__, "oclose"); |
| 3251 | int r; |
| 3252 | |
| 3253 | if (channel_proxy_upstream(c, type, seq, ssh)) |
| 3254 | return 0; |
| 3255 | if ((r = sshpkt_get_end(ssh)) != 0) { |
| 3256 | error_fr(r, "parse data")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3256 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse data"); |
| 3257 | ssh_packet_disconnect(ssh, "Invalid oclose message"); |
| 3258 | } |
| 3259 | chan_rcvd_oclose(ssh, c); |
| 3260 | return 0; |
| 3261 | } |
| 3262 | |
| 3263 | int |
| 3264 | channel_input_open_confirmation(int type, u_int32_t seq, struct ssh *ssh) |
| 3265 | { |
| 3266 | Channel *c = channel_from_packet_id(ssh, __func__, "open confirmation"); |
| 3267 | u_int32_t remote_window, remote_maxpacket; |
| 3268 | int r; |
| 3269 | |
| 3270 | if (channel_proxy_upstream(c, type, seq, ssh)) |
| 3271 | return 0; |
| 3272 | if (c->type != SSH_CHANNEL_OPENING3) |
| 3273 | ssh_packet_disconnect(ssh, "Received open confirmation for " |
| 3274 | "non-opening channel %d.", c->self); |
| 3275 | /* |
| 3276 | * Record the remote channel number and mark that the channel |
| 3277 | * is now open. |
| 3278 | */ |
| 3279 | if ((r = sshpkt_get_u32(ssh, &c->remote_id)) != 0 || |
| 3280 | (r = sshpkt_get_u32(ssh, &remote_window)) != 0 || |
| 3281 | (r = sshpkt_get_u32(ssh, &remote_maxpacket)) != 0 || |
| 3282 | (r = sshpkt_get_end(ssh)) != 0) { |
| 3283 | error_fr(r, "window/maxpacket")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3283 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "window/maxpacket"); |
| 3284 | ssh_packet_disconnect(ssh, "Invalid open confirmation message"); |
| 3285 | } |
| 3286 | |
| 3287 | c->have_remote_id = 1; |
| 3288 | c->remote_window = remote_window; |
| 3289 | c->remote_maxpacket = remote_maxpacket; |
| 3290 | c->type = SSH_CHANNEL_OPEN4; |
| 3291 | if (c->open_confirm) { |
| 3292 | debug2_f("channel %d: callback start", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3292 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: callback start" , c->self); |
| 3293 | c->open_confirm(ssh, c->self, 1, c->open_confirm_ctx); |
| 3294 | debug2_f("channel %d: callback done", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3294 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: callback done" , c->self); |
| 3295 | } |
| 3296 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3297 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: open confirm rwindow %u rmax %u" , c->self, c->remote_window, c->remote_maxpacket) |
| 3297 | c->remote_window, c->remote_maxpacket)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3297 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: open confirm rwindow %u rmax %u" , c->self, c->remote_window, c->remote_maxpacket); |
| 3298 | return 0; |
| 3299 | } |
| 3300 | |
| 3301 | static char * |
| 3302 | reason2txt(int reason) |
| 3303 | { |
| 3304 | switch (reason) { |
| 3305 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED1: |
| 3306 | return "administratively prohibited"; |
| 3307 | case SSH2_OPEN_CONNECT_FAILED2: |
| 3308 | return "connect failed"; |
| 3309 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE3: |
| 3310 | return "unknown channel type"; |
| 3311 | case SSH2_OPEN_RESOURCE_SHORTAGE4: |
| 3312 | return "resource shortage"; |
| 3313 | } |
| 3314 | return "unknown reason"; |
| 3315 | } |
| 3316 | |
| 3317 | int |
| 3318 | channel_input_open_failure(int type, u_int32_t seq, struct ssh *ssh) |
| 3319 | { |
| 3320 | Channel *c = channel_from_packet_id(ssh, __func__, "open failure"); |
| 3321 | u_int32_t reason; |
| 3322 | char *msg = NULL((void *)0); |
| 3323 | int r; |
| 3324 | |
| 3325 | if (channel_proxy_upstream(c, type, seq, ssh)) |
| 3326 | return 0; |
| 3327 | if (c->type != SSH_CHANNEL_OPENING3) |
| 3328 | ssh_packet_disconnect(ssh, "Received open failure for " |
| 3329 | "non-opening channel %d.", c->self); |
| 3330 | if ((r = sshpkt_get_u32(ssh, &reason)) != 0) { |
| 3331 | error_fr(r, "parse reason")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3331 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse reason"); |
| 3332 | ssh_packet_disconnect(ssh, "Invalid open failure message"); |
| 3333 | } |
| 3334 | /* skip language */ |
| 3335 | if ((r = sshpkt_get_cstring(ssh, &msg, NULL((void *)0))) != 0 || |
| 3336 | (r = sshpkt_get_string_direct(ssh, NULL((void *)0), NULL((void *)0))) != 0 || |
| 3337 | (r = sshpkt_get_end(ssh)) != 0) { |
| 3338 | error_fr(r, "parse msg/lang")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3338 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse msg/lang"); |
| 3339 | ssh_packet_disconnect(ssh, "Invalid open failure message"); |
| 3340 | } |
| 3341 | logit("channel %d: open failed: %s%s%s", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3342 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: open failed: %s%s%s" , c->self, reason2txt(reason), msg ? ": ": "", msg ? msg : "") |
| 3342 | reason2txt(reason), msg ? ": ": "", msg ? msg : "")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3342 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "channel %d: open failed: %s%s%s" , c->self, reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
| 3343 | free(msg); |
| 3344 | if (c->open_confirm) { |
| 3345 | debug2_f("channel %d: callback start", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3345 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: callback start" , c->self); |
| 3346 | c->open_confirm(ssh, c->self, 0, c->open_confirm_ctx); |
| 3347 | debug2_f("channel %d: callback done", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3347 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: callback done" , c->self); |
| 3348 | } |
| 3349 | /* Schedule the channel for cleanup/deletion. */ |
| 3350 | chan_mark_dead(ssh, c); |
| 3351 | return 0; |
| 3352 | } |
| 3353 | |
| 3354 | int |
| 3355 | channel_input_window_adjust(int type, u_int32_t seq, struct ssh *ssh) |
| 3356 | { |
| 3357 | int id = channel_parse_id(ssh, __func__, "window adjust"); |
| 3358 | Channel *c; |
| 3359 | u_int32_t adjust; |
| 3360 | u_int new_rwin; |
| 3361 | int r; |
| 3362 | |
| 3363 | if ((c = channel_lookup(ssh, id)) == NULL((void *)0)) { |
| 3364 | logit("Received window adjust for non-open channel %d.", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3364 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received window adjust for non-open channel %d." , id); |
| 3365 | return 0; |
| 3366 | } |
| 3367 | |
| 3368 | if (channel_proxy_upstream(c, type, seq, ssh)) |
| 3369 | return 0; |
| 3370 | if ((r = sshpkt_get_u32(ssh, &adjust)) != 0 || |
| 3371 | (r = sshpkt_get_end(ssh)) != 0) { |
| 3372 | error_fr(r, "parse adjust")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3372 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse adjust"); |
| 3373 | ssh_packet_disconnect(ssh, "Invalid window adjust message"); |
| 3374 | } |
| 3375 | debug2("channel %d: rcvd adjust %u", c->self, adjust)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3375 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: rcvd adjust %u" , c->self, adjust); |
| 3376 | if ((new_rwin = c->remote_window + adjust) < c->remote_window) { |
| 3377 | fatal("channel %d: adjust %u overflows remote window %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3378 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: adjust %u overflows remote window %u" , c->self, adjust, c->remote_window) |
| 3378 | c->self, adjust, c->remote_window)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3378 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: adjust %u overflows remote window %u" , c->self, adjust, c->remote_window); |
| 3379 | } |
| 3380 | c->remote_window = new_rwin; |
| 3381 | return 0; |
| 3382 | } |
| 3383 | |
| 3384 | int |
| 3385 | channel_input_status_confirm(int type, u_int32_t seq, struct ssh *ssh) |
| 3386 | { |
| 3387 | int id = channel_parse_id(ssh, __func__, "status confirm"); |
| 3388 | Channel *c; |
| 3389 | struct channel_confirm *cc; |
| 3390 | |
| 3391 | /* Reset keepalive timeout */ |
| 3392 | ssh_packet_set_alive_timeouts(ssh, 0); |
| 3393 | |
| 3394 | debug2_f("type %d id %d", type, id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3394 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "type %d id %d", type, id); |
| 3395 | |
| 3396 | if ((c = channel_lookup(ssh, id)) == NULL((void *)0)) { |
| 3397 | logit_f("%d: unknown", id)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3397 , 1, SYSLOG_LEVEL_INFO, ((void *)0), "%d: unknown", id); |
| 3398 | return 0; |
| 3399 | } |
| 3400 | if (channel_proxy_upstream(c, type, seq, ssh)) |
| 3401 | return 0; |
| 3402 | if (sshpkt_get_end(ssh) != 0) |
| 3403 | ssh_packet_disconnect(ssh, "Invalid status confirm message"); |
| 3404 | if ((cc = TAILQ_FIRST(&c->status_confirms)((&c->status_confirms)->tqh_first)) == NULL((void *)0)) |
| 3405 | return 0; |
| 3406 | cc->cb(ssh, type, c, cc->ctx); |
| 3407 | TAILQ_REMOVE(&c->status_confirms, cc, entry)do { if (((cc)->entry.tqe_next) != ((void *)0)) (cc)->entry .tqe_next->entry.tqe_prev = (cc)->entry.tqe_prev; else ( &c->status_confirms)->tqh_last = (cc)->entry.tqe_prev ; *(cc)->entry.tqe_prev = (cc)->entry.tqe_next; ; ; } while (0); |
| 3408 | freezero(cc, sizeof(*cc)); |
| 3409 | return 0; |
| 3410 | } |
| 3411 | |
| 3412 | /* -- tcp forwarding */ |
| 3413 | |
| 3414 | void |
| 3415 | channel_set_af(struct ssh *ssh, int af) |
| 3416 | { |
| 3417 | ssh->chanctxt->IPv4or6 = af; |
| 3418 | } |
| 3419 | |
| 3420 | |
| 3421 | /* |
| 3422 | * Determine whether or not a port forward listens to loopback, the |
| 3423 | * specified address or wildcard. On the client, a specified bind |
| 3424 | * address will always override gateway_ports. On the server, a |
| 3425 | * gateway_ports of 1 (``yes'') will override the client's specification |
| 3426 | * and force a wildcard bind, whereas a value of 2 (``clientspecified'') |
| 3427 | * will bind to whatever address the client asked for. |
| 3428 | * |
| 3429 | * Special-case listen_addrs are: |
| 3430 | * |
| 3431 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR |
| 3432 | * "" (empty string), "*" -> wildcard v4/v6 |
| 3433 | * "localhost" -> loopback v4/v6 |
| 3434 | * "127.0.0.1" / "::1" -> accepted even if gateway_ports isn't set |
| 3435 | */ |
| 3436 | static const char * |
| 3437 | channel_fwd_bind_addr(struct ssh *ssh, const char *listen_addr, int *wildcardp, |
| 3438 | int is_client, struct ForwardOptions *fwd_opts) |
| 3439 | { |
| 3440 | const char *addr = NULL((void *)0); |
| 3441 | int wildcard = 0; |
| 3442 | |
| 3443 | if (listen_addr == NULL((void *)0)) { |
| 3444 | /* No address specified: default to gateway_ports setting */ |
| 3445 | if (fwd_opts->gateway_ports) |
| 3446 | wildcard = 1; |
| 3447 | } else if (fwd_opts->gateway_ports || is_client) { |
| 3448 | if (((ssh->compat & SSH_OLD_FORWARD_ADDR0x01000000) && |
| 3449 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
| 3450 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
| 3451 | (!is_client && fwd_opts->gateway_ports == 1)) { |
| 3452 | wildcard = 1; |
| 3453 | /* |
| 3454 | * Notify client if they requested a specific listen |
| 3455 | * address and it was overridden. |
| 3456 | */ |
| 3457 | if (*listen_addr != '\0' && |
| 3458 | strcmp(listen_addr, "0.0.0.0") != 0 && |
| 3459 | strcmp(listen_addr, "*") != 0) { |
| 3460 | ssh_packet_send_debug(ssh, |
| 3461 | "Forwarding listen address " |
| 3462 | "\"%s\" overridden by server " |
| 3463 | "GatewayPorts", listen_addr); |
| 3464 | } |
| 3465 | } else if (strcmp(listen_addr, "localhost") != 0 || |
| 3466 | strcmp(listen_addr, "127.0.0.1") == 0 || |
| 3467 | strcmp(listen_addr, "::1") == 0) { |
| 3468 | /* |
| 3469 | * Accept explicit localhost address when |
| 3470 | * GatewayPorts=yes. The "localhost" hostname is |
| 3471 | * deliberately skipped here so it will listen on all |
| 3472 | * available local address families. |
| 3473 | */ |
| 3474 | addr = listen_addr; |
| 3475 | } |
| 3476 | } else if (strcmp(listen_addr, "127.0.0.1") == 0 || |
| 3477 | strcmp(listen_addr, "::1") == 0) { |
| 3478 | /* |
| 3479 | * If a specific IPv4/IPv6 localhost address has been |
| 3480 | * requested then accept it even if gateway_ports is in |
| 3481 | * effect. This allows the client to prefer IPv4 or IPv6. |
| 3482 | */ |
| 3483 | addr = listen_addr; |
| 3484 | } |
| 3485 | if (wildcardp != NULL((void *)0)) |
| 3486 | *wildcardp = wildcard; |
| 3487 | return addr; |
| 3488 | } |
| 3489 | |
| 3490 | static int |
| 3491 | channel_setup_fwd_listener_tcpip(struct ssh *ssh, int type, |
| 3492 | struct Forward *fwd, int *allocated_listen_port, |
| 3493 | struct ForwardOptions *fwd_opts) |
| 3494 | { |
| 3495 | Channel *c; |
| 3496 | int sock, r, success = 0, wildcard = 0, is_client; |
| 3497 | struct addrinfo hints, *ai, *aitop; |
| 3498 | const char *host, *addr; |
| 3499 | char ntop[NI_MAXHOST256], strport[NI_MAXSERV32]; |
| 3500 | in_port_t *lport_p; |
| 3501 | |
| 3502 | is_client = (type == SSH_CHANNEL_PORT_LISTENER2); |
| 3503 | |
| 3504 | if (is_client && fwd->connect_path != NULL((void *)0)) { |
| 3505 | host = fwd->connect_path; |
| 3506 | } else { |
| 3507 | host = (type == SSH_CHANNEL_RPORT_LISTENER11) ? |
| 3508 | fwd->listen_host : fwd->connect_host; |
| 3509 | if (host == NULL((void *)0)) { |
| 3510 | error("No forward host name.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3510 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "No forward host name." ); |
| 3511 | return 0; |
| 3512 | } |
| 3513 | if (strlen(host) >= NI_MAXHOST256) { |
| 3514 | error("Forward host name too long.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3514 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Forward host name too long." ); |
| 3515 | return 0; |
| 3516 | } |
| 3517 | } |
| 3518 | |
| 3519 | /* Determine the bind address, cf. channel_fwd_bind_addr() comment */ |
| 3520 | addr = channel_fwd_bind_addr(ssh, fwd->listen_host, &wildcard, |
| 3521 | is_client, fwd_opts); |
| 3522 | debug3_f("type %d wildcard %d addr %s", type, wildcard,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3523 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "type %d wildcard %d addr %s" , type, wildcard, (addr == ((void *)0)) ? "NULL" : addr) |
| 3523 | (addr == NULL) ? "NULL" : addr)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3523 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "type %d wildcard %d addr %s" , type, wildcard, (addr == ((void *)0)) ? "NULL" : addr); |
| 3524 | |
| 3525 | /* |
| 3526 | * getaddrinfo returns a loopback address if the hostname is |
| 3527 | * set to NULL and hints.ai_flags is not AI_PASSIVE |
| 3528 | */ |
| 3529 | memset(&hints, 0, sizeof(hints)); |
| 3530 | hints.ai_family = ssh->chanctxt->IPv4or6; |
| 3531 | hints.ai_flags = wildcard ? AI_PASSIVE1 : 0; |
| 3532 | hints.ai_socktype = SOCK_STREAM1; |
| 3533 | snprintf(strport, sizeof strport, "%d", fwd->listen_port); |
| 3534 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
| 3535 | if (addr == NULL((void *)0)) { |
| 3536 | /* This really shouldn't happen */ |
| 3537 | ssh_packet_disconnect(ssh, "getaddrinfo: fatal error: %s", |
| 3538 | ssh_gai_strerror(r)); |
| 3539 | } else { |
| 3540 | error_f("getaddrinfo(%.64s): %s", addr,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3541 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "getaddrinfo(%.64s): %s" , addr, ssh_gai_strerror(r)) |
| 3541 | ssh_gai_strerror(r))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3541 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "getaddrinfo(%.64s): %s" , addr, ssh_gai_strerror(r)); |
| 3542 | } |
| 3543 | return 0; |
| 3544 | } |
| 3545 | if (allocated_listen_port != NULL((void *)0)) |
| 3546 | *allocated_listen_port = 0; |
| 3547 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 3548 | switch (ai->ai_family) { |
| 3549 | case AF_INET2: |
| 3550 | lport_p = &((struct sockaddr_in *)ai->ai_addr)-> |
| 3551 | sin_port; |
| 3552 | break; |
| 3553 | case AF_INET624: |
| 3554 | lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> |
| 3555 | sin6_port; |
| 3556 | break; |
| 3557 | default: |
| 3558 | continue; |
| 3559 | } |
| 3560 | /* |
| 3561 | * If allocating a port for -R forwards, then use the |
| 3562 | * same port for all address families. |
| 3563 | */ |
| 3564 | if (type == SSH_CHANNEL_RPORT_LISTENER11 && |
| 3565 | fwd->listen_port == 0 && allocated_listen_port != NULL((void *)0) && |
| 3566 | *allocated_listen_port > 0) |
| 3567 | *lport_p = htons(*allocated_listen_port)(__uint16_t)(__builtin_constant_p(*allocated_listen_port) ? ( __uint16_t)(((__uint16_t)(*allocated_listen_port) & 0xffU ) << 8 | ((__uint16_t)(*allocated_listen_port) & 0xff00U ) >> 8) : __swap16md(*allocated_listen_port)); |
| 3568 | |
| 3569 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 3570 | strport, sizeof(strport), |
| 3571 | NI_NUMERICHOST1|NI_NUMERICSERV2) != 0) { |
| 3572 | error_f("getnameinfo failed")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3572 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "getnameinfo failed"); |
| 3573 | continue; |
| 3574 | } |
| 3575 | /* Create a port to listen for the host. */ |
| 3576 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
| 3577 | if (sock == -1) { |
| 3578 | /* this is no error since kernel may not support ipv6 */ |
| 3579 | verbose("socket [%s]:%s: %.100s", ntop, strport,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3580 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "socket [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))) |
| 3580 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3580 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "socket [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))); |
| 3581 | continue; |
| 3582 | } |
| 3583 | |
| 3584 | set_reuseaddr(sock); |
| 3585 | |
| 3586 | debug("Local forwarding listening on %s port %s.",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3587 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Local forwarding listening on %s port %s." , ntop, strport) |
| 3587 | ntop, strport)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3587 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Local forwarding listening on %s port %s." , ntop, strport); |
| 3588 | |
| 3589 | /* Bind the socket to the address. */ |
| 3590 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) == -1) { |
| 3591 | /* |
| 3592 | * address can be in if use ipv6 address is |
| 3593 | * already bound |
| 3594 | */ |
| 3595 | verbose("bind [%s]:%s: %.100s",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3596 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "bind [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))) |
| 3596 | ntop, strport, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3596 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "bind [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))); |
| 3597 | close(sock); |
| 3598 | continue; |
| 3599 | } |
| 3600 | /* Start listening for connections on the socket. */ |
| 3601 | if (listen(sock, SSH_LISTEN_BACKLOG128) == -1) { |
| 3602 | error("listen [%s]:%s: %.100s", ntop, strport,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3603 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "listen [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))) |
| 3603 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3603 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "listen [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))); |
| 3604 | close(sock); |
| 3605 | continue; |
| 3606 | } |
| 3607 | |
| 3608 | /* |
| 3609 | * fwd->listen_port == 0 requests a dynamically allocated port - |
| 3610 | * record what we got. |
| 3611 | */ |
| 3612 | if (type == SSH_CHANNEL_RPORT_LISTENER11 && |
| 3613 | fwd->listen_port == 0 && |
| 3614 | allocated_listen_port != NULL((void *)0) && |
| 3615 | *allocated_listen_port == 0) { |
| 3616 | *allocated_listen_port = get_local_port(sock); |
| 3617 | debug("Allocated listen port %d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3618 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Allocated listen port %d" , *allocated_listen_port) |
| 3618 | *allocated_listen_port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3618 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Allocated listen port %d" , *allocated_listen_port); |
| 3619 | } |
| 3620 | |
| 3621 | /* Allocate a channel number for the socket. */ |
| 3622 | c = channel_new(ssh, "port listener", type, sock, sock, -1, |
| 3623 | CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), |
| 3624 | 0, "port listener", 1); |
| 3625 | c->path = xstrdup(host); |
| 3626 | c->host_port = fwd->connect_port; |
| 3627 | c->listening_addr = addr == NULL((void *)0) ? NULL((void *)0) : xstrdup(addr); |
| 3628 | if (fwd->listen_port == 0 && allocated_listen_port != NULL((void *)0) && |
| 3629 | !(ssh->compat & SSH_BUG_DYNAMIC_RPORT0x08000000)) |
| 3630 | c->listening_port = *allocated_listen_port; |
| 3631 | else |
| 3632 | c->listening_port = fwd->listen_port; |
| 3633 | success = 1; |
| 3634 | } |
| 3635 | if (success == 0) |
| 3636 | error_f("cannot listen to port: %d", fwd->listen_port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3636 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "cannot listen to port: %d" , fwd->listen_port); |
| 3637 | freeaddrinfo(aitop); |
| 3638 | return success; |
| 3639 | } |
| 3640 | |
| 3641 | static int |
| 3642 | channel_setup_fwd_listener_streamlocal(struct ssh *ssh, int type, |
| 3643 | struct Forward *fwd, struct ForwardOptions *fwd_opts) |
| 3644 | { |
| 3645 | struct sockaddr_un sunaddr; |
| 3646 | const char *path; |
| 3647 | Channel *c; |
| 3648 | int port, sock; |
| 3649 | mode_t omask; |
| 3650 | |
| 3651 | switch (type) { |
| 3652 | case SSH_CHANNEL_UNIX_LISTENER18: |
| 3653 | if (fwd->connect_path != NULL((void *)0)) { |
| 3654 | if (strlen(fwd->connect_path) > sizeof(sunaddr.sun_path)) { |
| 3655 | error("Local connecting path too long: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3656 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Local connecting path too long: %s" , fwd->connect_path) |
| 3656 | fwd->connect_path)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3656 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Local connecting path too long: %s" , fwd->connect_path); |
| 3657 | return 0; |
| 3658 | } |
| 3659 | path = fwd->connect_path; |
| 3660 | port = PORT_STREAMLOCAL-2; |
| 3661 | } else { |
| 3662 | if (fwd->connect_host == NULL((void *)0)) { |
| 3663 | error("No forward host name.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3663 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "No forward host name." ); |
| 3664 | return 0; |
| 3665 | } |
| 3666 | if (strlen(fwd->connect_host) >= NI_MAXHOST256) { |
| 3667 | error("Forward host name too long.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3667 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Forward host name too long." ); |
| 3668 | return 0; |
| 3669 | } |
| 3670 | path = fwd->connect_host; |
| 3671 | port = fwd->connect_port; |
| 3672 | } |
| 3673 | break; |
| 3674 | case SSH_CHANNEL_RUNIX_LISTENER19: |
| 3675 | path = fwd->listen_path; |
| 3676 | port = PORT_STREAMLOCAL-2; |
| 3677 | break; |
| 3678 | default: |
| 3679 | error_f("unexpected channel type %d", type)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3679 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "unexpected channel type %d" , type); |
| 3680 | return 0; |
| 3681 | } |
| 3682 | |
| 3683 | if (fwd->listen_path == NULL((void *)0)) { |
| 3684 | error("No forward path name.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3684 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "No forward path name." ); |
| 3685 | return 0; |
| 3686 | } |
| 3687 | if (strlen(fwd->listen_path) > sizeof(sunaddr.sun_path)) { |
| 3688 | error("Local listening path too long: %s", fwd->listen_path)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3688 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Local listening path too long: %s" , fwd->listen_path); |
| 3689 | return 0; |
| 3690 | } |
| 3691 | |
| 3692 | debug3_f("type %d path %s", type, fwd->listen_path)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3692 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "type %d path %s", type , fwd->listen_path); |
| 3693 | |
| 3694 | /* Start a Unix domain listener. */ |
| 3695 | omask = umask(fwd_opts->streamlocal_bind_mask); |
| 3696 | sock = unix_listener(fwd->listen_path, SSH_LISTEN_BACKLOG128, |
| 3697 | fwd_opts->streamlocal_bind_unlink); |
| 3698 | umask(omask); |
| 3699 | if (sock < 0) |
| 3700 | return 0; |
| 3701 | |
| 3702 | debug("Local forwarding listening on path %s.", fwd->listen_path)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3702 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Local forwarding listening on path %s." , fwd->listen_path); |
| 3703 | |
| 3704 | /* Allocate a channel number for the socket. */ |
| 3705 | c = channel_new(ssh, "unix listener", type, sock, sock, -1, |
| 3706 | CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), |
| 3707 | 0, "unix listener", 1); |
| 3708 | c->path = xstrdup(path); |
| 3709 | c->host_port = port; |
| 3710 | c->listening_port = PORT_STREAMLOCAL-2; |
| 3711 | c->listening_addr = xstrdup(fwd->listen_path); |
| 3712 | return 1; |
| 3713 | } |
| 3714 | |
| 3715 | static int |
| 3716 | channel_cancel_rport_listener_tcpip(struct ssh *ssh, |
| 3717 | const char *host, u_short port) |
| 3718 | { |
| 3719 | u_int i; |
| 3720 | int found = 0; |
| 3721 | |
| 3722 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 3723 | Channel *c = ssh->chanctxt->channels[i]; |
| 3724 | if (c == NULL((void *)0) || c->type != SSH_CHANNEL_RPORT_LISTENER11) |
| 3725 | continue; |
| 3726 | if (strcmp(c->path, host) == 0 && c->listening_port == port) { |
| 3727 | debug2_f("close channel %d", i)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3727 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "close channel %d", i); |
| 3728 | channel_free(ssh, c); |
| 3729 | found = 1; |
| 3730 | } |
| 3731 | } |
| 3732 | |
| 3733 | return found; |
| 3734 | } |
| 3735 | |
| 3736 | static int |
| 3737 | channel_cancel_rport_listener_streamlocal(struct ssh *ssh, const char *path) |
| 3738 | { |
| 3739 | u_int i; |
| 3740 | int found = 0; |
| 3741 | |
| 3742 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 3743 | Channel *c = ssh->chanctxt->channels[i]; |
| 3744 | if (c == NULL((void *)0) || c->type != SSH_CHANNEL_RUNIX_LISTENER19) |
| 3745 | continue; |
| 3746 | if (c->path == NULL((void *)0)) |
| 3747 | continue; |
| 3748 | if (strcmp(c->path, path) == 0) { |
| 3749 | debug2_f("close channel %d", i)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3749 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "close channel %d", i); |
| 3750 | channel_free(ssh, c); |
| 3751 | found = 1; |
| 3752 | } |
| 3753 | } |
| 3754 | |
| 3755 | return found; |
| 3756 | } |
| 3757 | |
| 3758 | int |
| 3759 | channel_cancel_rport_listener(struct ssh *ssh, struct Forward *fwd) |
| 3760 | { |
| 3761 | if (fwd->listen_path != NULL((void *)0)) { |
| 3762 | return channel_cancel_rport_listener_streamlocal(ssh, |
| 3763 | fwd->listen_path); |
| 3764 | } else { |
| 3765 | return channel_cancel_rport_listener_tcpip(ssh, |
| 3766 | fwd->listen_host, fwd->listen_port); |
| 3767 | } |
| 3768 | } |
| 3769 | |
| 3770 | static int |
| 3771 | channel_cancel_lport_listener_tcpip(struct ssh *ssh, |
| 3772 | const char *lhost, u_short lport, int cport, |
| 3773 | struct ForwardOptions *fwd_opts) |
| 3774 | { |
| 3775 | u_int i; |
| 3776 | int found = 0; |
| 3777 | const char *addr = channel_fwd_bind_addr(ssh, lhost, NULL((void *)0), 1, fwd_opts); |
| 3778 | |
| 3779 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 3780 | Channel *c = ssh->chanctxt->channels[i]; |
| 3781 | if (c == NULL((void *)0) || c->type != SSH_CHANNEL_PORT_LISTENER2) |
| 3782 | continue; |
| 3783 | if (c->listening_port != lport) |
| 3784 | continue; |
| 3785 | if (cport == CHANNEL_CANCEL_PORT_STATIC-1) { |
| 3786 | /* skip dynamic forwardings */ |
| 3787 | if (c->host_port == 0) |
| 3788 | continue; |
| 3789 | } else { |
| 3790 | if (c->host_port != cport) |
| 3791 | continue; |
| 3792 | } |
| 3793 | if ((c->listening_addr == NULL((void *)0) && addr != NULL((void *)0)) || |
| 3794 | (c->listening_addr != NULL((void *)0) && addr == NULL((void *)0))) |
| 3795 | continue; |
| 3796 | if (addr == NULL((void *)0) || strcmp(c->listening_addr, addr) == 0) { |
| 3797 | debug2_f("close channel %d", i)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3797 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "close channel %d", i); |
| 3798 | channel_free(ssh, c); |
| 3799 | found = 1; |
| 3800 | } |
| 3801 | } |
| 3802 | |
| 3803 | return found; |
| 3804 | } |
| 3805 | |
| 3806 | static int |
| 3807 | channel_cancel_lport_listener_streamlocal(struct ssh *ssh, const char *path) |
| 3808 | { |
| 3809 | u_int i; |
| 3810 | int found = 0; |
| 3811 | |
| 3812 | if (path == NULL((void *)0)) { |
| 3813 | error_f("no path specified.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3813 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "no path specified."); |
| 3814 | return 0; |
| 3815 | } |
| 3816 | |
| 3817 | for (i = 0; i < ssh->chanctxt->channels_alloc; i++) { |
| 3818 | Channel *c = ssh->chanctxt->channels[i]; |
| 3819 | if (c == NULL((void *)0) || c->type != SSH_CHANNEL_UNIX_LISTENER18) |
| 3820 | continue; |
| 3821 | if (c->listening_addr == NULL((void *)0)) |
| 3822 | continue; |
| 3823 | if (strcmp(c->listening_addr, path) == 0) { |
| 3824 | debug2_f("close channel %d", i)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3824 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "close channel %d", i); |
| 3825 | channel_free(ssh, c); |
| 3826 | found = 1; |
| 3827 | } |
| 3828 | } |
| 3829 | |
| 3830 | return found; |
| 3831 | } |
| 3832 | |
| 3833 | int |
| 3834 | channel_cancel_lport_listener(struct ssh *ssh, |
| 3835 | struct Forward *fwd, int cport, struct ForwardOptions *fwd_opts) |
| 3836 | { |
| 3837 | if (fwd->listen_path != NULL((void *)0)) { |
| 3838 | return channel_cancel_lport_listener_streamlocal(ssh, |
| 3839 | fwd->listen_path); |
| 3840 | } else { |
| 3841 | return channel_cancel_lport_listener_tcpip(ssh, |
| 3842 | fwd->listen_host, fwd->listen_port, cport, fwd_opts); |
| 3843 | } |
| 3844 | } |
| 3845 | |
| 3846 | /* protocol local port fwd, used by ssh */ |
| 3847 | int |
| 3848 | channel_setup_local_fwd_listener(struct ssh *ssh, |
| 3849 | struct Forward *fwd, struct ForwardOptions *fwd_opts) |
| 3850 | { |
| 3851 | if (fwd->listen_path != NULL((void *)0)) { |
| 3852 | return channel_setup_fwd_listener_streamlocal(ssh, |
| 3853 | SSH_CHANNEL_UNIX_LISTENER18, fwd, fwd_opts); |
| 3854 | } else { |
| 3855 | return channel_setup_fwd_listener_tcpip(ssh, |
| 3856 | SSH_CHANNEL_PORT_LISTENER2, fwd, NULL((void *)0), fwd_opts); |
| 3857 | } |
| 3858 | } |
| 3859 | |
| 3860 | /* Matches a remote forwarding permission against a requested forwarding */ |
| 3861 | static int |
| 3862 | remote_open_match(struct permission *allowed_open, struct Forward *fwd) |
| 3863 | { |
| 3864 | int ret; |
| 3865 | char *lhost; |
| 3866 | |
| 3867 | /* XXX add ACLs for streamlocal */ |
| 3868 | if (fwd->listen_path != NULL((void *)0)) |
| 3869 | return 1; |
| 3870 | |
| 3871 | if (fwd->listen_host == NULL((void *)0) || allowed_open->listen_host == NULL((void *)0)) |
| 3872 | return 0; |
| 3873 | |
| 3874 | if (allowed_open->listen_port != FWD_PERMIT_ANY_PORT0 && |
| 3875 | allowed_open->listen_port != fwd->listen_port) |
| 3876 | return 0; |
| 3877 | |
| 3878 | /* Match hostnames case-insensitively */ |
| 3879 | lhost = xstrdup(fwd->listen_host); |
| 3880 | lowercase(lhost); |
| 3881 | ret = match_pattern(lhost, allowed_open->listen_host); |
| 3882 | free(lhost); |
| 3883 | |
| 3884 | return ret; |
| 3885 | } |
| 3886 | |
| 3887 | /* Checks whether a requested remote forwarding is permitted */ |
| 3888 | static int |
| 3889 | check_rfwd_permission(struct ssh *ssh, struct Forward *fwd) |
| 3890 | { |
| 3891 | struct ssh_channels *sc = ssh->chanctxt; |
| 3892 | struct permission_set *pset = &sc->remote_perms; |
| 3893 | u_int i, permit, permit_adm = 1; |
| 3894 | struct permission *perm; |
| 3895 | |
| 3896 | /* XXX apply GatewayPorts override before checking? */ |
| 3897 | |
| 3898 | permit = pset->all_permitted; |
| 3899 | if (!permit) { |
| 3900 | for (i = 0; i < pset->num_permitted_user; i++) { |
| 3901 | perm = &pset->permitted_user[i]; |
| 3902 | if (remote_open_match(perm, fwd)) { |
| 3903 | permit = 1; |
| 3904 | break; |
| 3905 | } |
| 3906 | } |
| 3907 | } |
| 3908 | |
| 3909 | if (pset->num_permitted_admin > 0) { |
| 3910 | permit_adm = 0; |
| 3911 | for (i = 0; i < pset->num_permitted_admin; i++) { |
| 3912 | perm = &pset->permitted_admin[i]; |
| 3913 | if (remote_open_match(perm, fwd)) { |
| 3914 | permit_adm = 1; |
| 3915 | break; |
| 3916 | } |
| 3917 | } |
| 3918 | } |
| 3919 | |
| 3920 | return permit && permit_adm; |
| 3921 | } |
| 3922 | |
| 3923 | /* protocol v2 remote port fwd, used by sshd */ |
| 3924 | int |
| 3925 | channel_setup_remote_fwd_listener(struct ssh *ssh, struct Forward *fwd, |
| 3926 | int *allocated_listen_port, struct ForwardOptions *fwd_opts) |
| 3927 | { |
| 3928 | if (!check_rfwd_permission(ssh, fwd)) { |
| 3929 | ssh_packet_send_debug(ssh, "port forwarding refused"); |
| 3930 | if (fwd->listen_path != NULL((void *)0)) |
| 3931 | /* XXX always allowed, see remote_open_match() */ |
| 3932 | logit("Received request from %.100s port %d to "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3936 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to path \"%.100s\", " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_path ) |
| 3933 | "remote forward to path \"%.100s\", "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3936 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to path \"%.100s\", " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_path ) |
| 3934 | "but the request was denied.",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3936 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to path \"%.100s\", " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_path ) |
| 3935 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3936 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to path \"%.100s\", " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_path ) |
| 3936 | fwd->listen_path)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3936 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to path \"%.100s\", " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_path ); |
| 3937 | else if(fwd->listen_host != NULL((void *)0)) |
| 3938 | logit("Received request from %.100s port %d to "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3942 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to host %.100s port %d, " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_host , fwd->listen_port) |
| 3939 | "remote forward to host %.100s port %d, "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3942 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to host %.100s port %d, " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_host , fwd->listen_port) |
| 3940 | "but the request was denied.",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3942 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to host %.100s port %d, " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_host , fwd->listen_port) |
| 3941 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3942 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to host %.100s port %d, " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_host , fwd->listen_port) |
| 3942 | fwd->listen_host, fwd->listen_port )sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3942 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to " "remote forward to host %.100s port %d, " "but the request was denied." , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), fwd->listen_host , fwd->listen_port); |
| 3943 | else |
| 3944 | logit("Received request from %.100s port %d to remote "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3946 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to remote " "forward, but the request was denied.", ssh_remote_ipaddr(ssh ), ssh_remote_port(ssh)) |
| 3945 | "forward, but the request was denied.",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3946 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to remote " "forward, but the request was denied.", ssh_remote_ipaddr(ssh ), ssh_remote_port(ssh)) |
| 3946 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3946 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to remote " "forward, but the request was denied.", ssh_remote_ipaddr(ssh ), ssh_remote_port(ssh)); |
| 3947 | return 0; |
| 3948 | } |
| 3949 | if (fwd->listen_path != NULL((void *)0)) { |
| 3950 | return channel_setup_fwd_listener_streamlocal(ssh, |
| 3951 | SSH_CHANNEL_RUNIX_LISTENER19, fwd, fwd_opts); |
| 3952 | } else { |
| 3953 | return channel_setup_fwd_listener_tcpip(ssh, |
| 3954 | SSH_CHANNEL_RPORT_LISTENER11, fwd, allocated_listen_port, |
| 3955 | fwd_opts); |
| 3956 | } |
| 3957 | } |
| 3958 | |
| 3959 | /* |
| 3960 | * Translate the requested rfwd listen host to something usable for |
| 3961 | * this server. |
| 3962 | */ |
| 3963 | static const char * |
| 3964 | channel_rfwd_bind_host(const char *listen_host) |
| 3965 | { |
| 3966 | if (listen_host == NULL((void *)0)) { |
| 3967 | return "localhost"; |
| 3968 | } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) { |
| 3969 | return ""; |
| 3970 | } else |
| 3971 | return listen_host; |
| 3972 | } |
| 3973 | |
| 3974 | /* |
| 3975 | * Initiate forwarding of connections to port "port" on remote host through |
| 3976 | * the secure channel to host:port from local side. |
| 3977 | * Returns handle (index) for updating the dynamic listen port with |
| 3978 | * channel_update_permission(). |
| 3979 | */ |
| 3980 | int |
| 3981 | channel_request_remote_forwarding(struct ssh *ssh, struct Forward *fwd) |
| 3982 | { |
| 3983 | int r, success = 0, idx = -1; |
| 3984 | char *host_to_connect, *listen_host, *listen_path; |
| 3985 | int port_to_connect, listen_port; |
| 3986 | |
| 3987 | /* Send the forward request to the remote side. */ |
| 3988 | if (fwd->listen_path != NULL((void *)0)) { |
| 3989 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST80)) != 0 || |
| 3990 | (r = sshpkt_put_cstring(ssh, |
| 3991 | "streamlocal-forward@openssh.com")) != 0 || |
| 3992 | (r = sshpkt_put_u8(ssh, 1)) != 0 || /* want reply */ |
| 3993 | (r = sshpkt_put_cstring(ssh, fwd->listen_path)) != 0 || |
| 3994 | (r = sshpkt_send(ssh)) != 0 || |
| 3995 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 3996 | fatal_fr(r, "request streamlocal")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 3996 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request streamlocal"); |
| 3997 | } else { |
| 3998 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST80)) != 0 || |
| 3999 | (r = sshpkt_put_cstring(ssh, "tcpip-forward")) != 0 || |
| 4000 | (r = sshpkt_put_u8(ssh, 1)) != 0 || /* want reply */ |
| 4001 | (r = sshpkt_put_cstring(ssh, |
| 4002 | channel_rfwd_bind_host(fwd->listen_host))) != 0 || |
| 4003 | (r = sshpkt_put_u32(ssh, fwd->listen_port)) != 0 || |
| 4004 | (r = sshpkt_send(ssh)) != 0 || |
| 4005 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 4006 | fatal_fr(r, "request tcpip-forward")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4006 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request tcpip-forward"); |
| 4007 | } |
| 4008 | /* Assume that server accepts the request */ |
| 4009 | success = 1; |
| 4010 | if (success) { |
| 4011 | /* Record that connection to this host/port is permitted. */ |
| 4012 | host_to_connect = listen_host = listen_path = NULL((void *)0); |
| 4013 | port_to_connect = listen_port = 0; |
Value stored to 'port_to_connect' is never read | |
| 4014 | if (fwd->connect_path != NULL((void *)0)) { |
| 4015 | host_to_connect = xstrdup(fwd->connect_path); |
| 4016 | port_to_connect = PORT_STREAMLOCAL-2; |
| 4017 | } else { |
| 4018 | host_to_connect = xstrdup(fwd->connect_host); |
| 4019 | port_to_connect = fwd->connect_port; |
| 4020 | } |
| 4021 | if (fwd->listen_path != NULL((void *)0)) { |
| 4022 | listen_path = xstrdup(fwd->listen_path); |
| 4023 | listen_port = PORT_STREAMLOCAL-2; |
| 4024 | } else { |
| 4025 | if (fwd->listen_host != NULL((void *)0)) |
| 4026 | listen_host = xstrdup(fwd->listen_host); |
| 4027 | listen_port = fwd->listen_port; |
| 4028 | } |
| 4029 | idx = permission_set_add(ssh, FORWARD_USER0x101, FORWARD_LOCAL(1<<1), |
| 4030 | host_to_connect, port_to_connect, |
| 4031 | listen_host, listen_path, listen_port, NULL((void *)0)); |
| 4032 | } |
| 4033 | return idx; |
| 4034 | } |
| 4035 | |
| 4036 | static int |
| 4037 | open_match(struct permission *allowed_open, const char *requestedhost, |
| 4038 | int requestedport) |
| 4039 | { |
| 4040 | if (allowed_open->host_to_connect == NULL((void *)0)) |
| 4041 | return 0; |
| 4042 | if (allowed_open->port_to_connect != FWD_PERMIT_ANY_PORT0 && |
| 4043 | allowed_open->port_to_connect != requestedport) |
| 4044 | return 0; |
| 4045 | if (strcmp(allowed_open->host_to_connect, FWD_PERMIT_ANY_HOST"*") != 0 && |
| 4046 | strcmp(allowed_open->host_to_connect, requestedhost) != 0) |
| 4047 | return 0; |
| 4048 | return 1; |
| 4049 | } |
| 4050 | |
| 4051 | /* |
| 4052 | * Note that in the listen host/port case |
| 4053 | * we don't support FWD_PERMIT_ANY_PORT and |
| 4054 | * need to translate between the configured-host (listen_host) |
| 4055 | * and what we've sent to the remote server (channel_rfwd_bind_host) |
| 4056 | */ |
| 4057 | static int |
| 4058 | open_listen_match_tcpip(struct permission *allowed_open, |
| 4059 | const char *requestedhost, u_short requestedport, int translate) |
| 4060 | { |
| 4061 | const char *allowed_host; |
| 4062 | |
| 4063 | if (allowed_open->host_to_connect == NULL((void *)0)) |
| 4064 | return 0; |
| 4065 | if (allowed_open->listen_port != requestedport) |
| 4066 | return 0; |
| 4067 | if (!translate && allowed_open->listen_host == NULL((void *)0) && |
| 4068 | requestedhost == NULL((void *)0)) |
| 4069 | return 1; |
| 4070 | allowed_host = translate ? |
| 4071 | channel_rfwd_bind_host(allowed_open->listen_host) : |
| 4072 | allowed_open->listen_host; |
| 4073 | if (allowed_host == NULL((void *)0) || requestedhost == NULL((void *)0) || |
| 4074 | strcmp(allowed_host, requestedhost) != 0) |
| 4075 | return 0; |
| 4076 | return 1; |
| 4077 | } |
| 4078 | |
| 4079 | static int |
| 4080 | open_listen_match_streamlocal(struct permission *allowed_open, |
| 4081 | const char *requestedpath) |
| 4082 | { |
| 4083 | if (allowed_open->host_to_connect == NULL((void *)0)) |
| 4084 | return 0; |
| 4085 | if (allowed_open->listen_port != PORT_STREAMLOCAL-2) |
| 4086 | return 0; |
| 4087 | if (allowed_open->listen_path == NULL((void *)0) || |
| 4088 | strcmp(allowed_open->listen_path, requestedpath) != 0) |
| 4089 | return 0; |
| 4090 | return 1; |
| 4091 | } |
| 4092 | |
| 4093 | /* |
| 4094 | * Request cancellation of remote forwarding of connection host:port from |
| 4095 | * local side. |
| 4096 | */ |
| 4097 | static int |
| 4098 | channel_request_rforward_cancel_tcpip(struct ssh *ssh, |
| 4099 | const char *host, u_short port) |
| 4100 | { |
| 4101 | struct ssh_channels *sc = ssh->chanctxt; |
| 4102 | struct permission_set *pset = &sc->local_perms; |
| 4103 | int r; |
| 4104 | u_int i; |
| 4105 | struct permission *perm = NULL((void *)0); |
| 4106 | |
| 4107 | for (i = 0; i < pset->num_permitted_user; i++) { |
| 4108 | perm = &pset->permitted_user[i]; |
| 4109 | if (open_listen_match_tcpip(perm, host, port, 0)) |
| 4110 | break; |
| 4111 | perm = NULL((void *)0); |
| 4112 | } |
| 4113 | if (perm == NULL((void *)0)) { |
| 4114 | debug_f("requested forward not found")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4114 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "requested forward not found" ); |
| 4115 | return -1; |
| 4116 | } |
| 4117 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST80)) != 0 || |
| 4118 | (r = sshpkt_put_cstring(ssh, "cancel-tcpip-forward")) != 0 || |
| 4119 | (r = sshpkt_put_u8(ssh, 0)) != 0 || /* want reply */ |
| 4120 | (r = sshpkt_put_cstring(ssh, channel_rfwd_bind_host(host))) != 0 || |
| 4121 | (r = sshpkt_put_u32(ssh, port)) != 0 || |
| 4122 | (r = sshpkt_send(ssh)) != 0) |
| 4123 | fatal_fr(r, "send cancel")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4123 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send cancel"); |
| 4124 | |
| 4125 | fwd_perm_clear(perm); /* unregister */ |
| 4126 | |
| 4127 | return 0; |
| 4128 | } |
| 4129 | |
| 4130 | /* |
| 4131 | * Request cancellation of remote forwarding of Unix domain socket |
| 4132 | * path from local side. |
| 4133 | */ |
| 4134 | static int |
| 4135 | channel_request_rforward_cancel_streamlocal(struct ssh *ssh, const char *path) |
| 4136 | { |
| 4137 | struct ssh_channels *sc = ssh->chanctxt; |
| 4138 | struct permission_set *pset = &sc->local_perms; |
| 4139 | int r; |
| 4140 | u_int i; |
| 4141 | struct permission *perm = NULL((void *)0); |
| 4142 | |
| 4143 | for (i = 0; i < pset->num_permitted_user; i++) { |
| 4144 | perm = &pset->permitted_user[i]; |
| 4145 | if (open_listen_match_streamlocal(perm, path)) |
| 4146 | break; |
| 4147 | perm = NULL((void *)0); |
| 4148 | } |
| 4149 | if (perm == NULL((void *)0)) { |
| 4150 | debug_f("requested forward not found")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4150 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "requested forward not found" ); |
| 4151 | return -1; |
| 4152 | } |
| 4153 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST80)) != 0 || |
| 4154 | (r = sshpkt_put_cstring(ssh, |
| 4155 | "cancel-streamlocal-forward@openssh.com")) != 0 || |
| 4156 | (r = sshpkt_put_u8(ssh, 0)) != 0 || /* want reply */ |
| 4157 | (r = sshpkt_put_cstring(ssh, path)) != 0 || |
| 4158 | (r = sshpkt_send(ssh)) != 0) |
| 4159 | fatal_fr(r, "send cancel")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4159 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send cancel"); |
| 4160 | |
| 4161 | fwd_perm_clear(perm); /* unregister */ |
| 4162 | |
| 4163 | return 0; |
| 4164 | } |
| 4165 | |
| 4166 | /* |
| 4167 | * Request cancellation of remote forwarding of a connection from local side. |
| 4168 | */ |
| 4169 | int |
| 4170 | channel_request_rforward_cancel(struct ssh *ssh, struct Forward *fwd) |
| 4171 | { |
| 4172 | if (fwd->listen_path != NULL((void *)0)) { |
| 4173 | return channel_request_rforward_cancel_streamlocal(ssh, |
| 4174 | fwd->listen_path); |
| 4175 | } else { |
| 4176 | return channel_request_rforward_cancel_tcpip(ssh, |
| 4177 | fwd->listen_host, |
| 4178 | fwd->listen_port ? fwd->listen_port : fwd->allocated_port); |
| 4179 | } |
| 4180 | } |
| 4181 | |
| 4182 | /* |
| 4183 | * Permits opening to any host/port if permitted_user[] is empty. This is |
| 4184 | * usually called by the server, because the user could connect to any port |
| 4185 | * anyway, and the server has no way to know but to trust the client anyway. |
| 4186 | */ |
| 4187 | void |
| 4188 | channel_permit_all(struct ssh *ssh, int where) |
| 4189 | { |
| 4190 | struct permission_set *pset = permission_set_get(ssh, where); |
| 4191 | |
| 4192 | if (pset->num_permitted_user == 0) |
| 4193 | pset->all_permitted = 1; |
| 4194 | } |
| 4195 | |
| 4196 | /* |
| 4197 | * Permit the specified host/port for forwarding. |
| 4198 | */ |
| 4199 | void |
| 4200 | channel_add_permission(struct ssh *ssh, int who, int where, |
| 4201 | char *host, int port) |
| 4202 | { |
| 4203 | int local = where == FORWARD_LOCAL(1<<1); |
| 4204 | struct permission_set *pset = permission_set_get(ssh, where); |
| 4205 | |
| 4206 | debug("allow %s forwarding to host %s port %d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4207 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "allow %s forwarding to host %s port %d" , fwd_ident(who, where), host, port) |
| 4207 | fwd_ident(who, where), host, port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4207 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "allow %s forwarding to host %s port %d" , fwd_ident(who, where), host, port); |
| 4208 | /* |
| 4209 | * Remote forwards set listen_host/port, local forwards set |
| 4210 | * host/port_to_connect. |
| 4211 | */ |
| 4212 | permission_set_add(ssh, who, where, |
| 4213 | local ? host : 0, local ? port : 0, |
| 4214 | local ? NULL((void *)0) : host, NULL((void *)0), local ? 0 : port, NULL((void *)0)); |
| 4215 | pset->all_permitted = 0; |
| 4216 | } |
| 4217 | |
| 4218 | /* |
| 4219 | * Administratively disable forwarding. |
| 4220 | */ |
| 4221 | void |
| 4222 | channel_disable_admin(struct ssh *ssh, int where) |
| 4223 | { |
| 4224 | channel_clear_permission(ssh, FORWARD_ADM0x100, where); |
| 4225 | permission_set_add(ssh, FORWARD_ADM0x100, where, |
| 4226 | NULL((void *)0), 0, NULL((void *)0), NULL((void *)0), 0, NULL((void *)0)); |
| 4227 | } |
| 4228 | |
| 4229 | /* |
| 4230 | * Clear a list of permitted opens. |
| 4231 | */ |
| 4232 | void |
| 4233 | channel_clear_permission(struct ssh *ssh, int who, int where) |
| 4234 | { |
| 4235 | struct permission **permp; |
| 4236 | u_int *npermp; |
| 4237 | |
| 4238 | permission_set_get_array(ssh, who, where, &permp, &npermp); |
| 4239 | *permp = xrecallocarray(*permp, *npermp, 0, sizeof(**permp)); |
| 4240 | *npermp = 0; |
| 4241 | } |
| 4242 | |
| 4243 | /* |
| 4244 | * Update the listen port for a dynamic remote forward, after |
| 4245 | * the actual 'newport' has been allocated. If 'newport' < 0 is |
| 4246 | * passed then they entry will be invalidated. |
| 4247 | */ |
| 4248 | void |
| 4249 | channel_update_permission(struct ssh *ssh, int idx, int newport) |
| 4250 | { |
| 4251 | struct permission_set *pset = &ssh->chanctxt->local_perms; |
| 4252 | |
| 4253 | if (idx < 0 || (u_int)idx >= pset->num_permitted_user) { |
| 4254 | debug_f("index out of range: %d num_permitted_user %d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4255 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "index out of range: %d num_permitted_user %d" , idx, pset->num_permitted_user) |
| 4255 | idx, pset->num_permitted_user)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4255 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "index out of range: %d num_permitted_user %d" , idx, pset->num_permitted_user); |
| 4256 | return; |
| 4257 | } |
| 4258 | debug("%s allowed port %d for forwarding to host %s port %d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4262 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s allowed port %d for forwarding to host %s port %d" , newport > 0 ? "Updating" : "Removing", newport, pset-> permitted_user[idx].host_to_connect, pset->permitted_user[ idx].port_to_connect) |
| 4259 | newport > 0 ? "Updating" : "Removing",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4262 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s allowed port %d for forwarding to host %s port %d" , newport > 0 ? "Updating" : "Removing", newport, pset-> permitted_user[idx].host_to_connect, pset->permitted_user[ idx].port_to_connect) |
| 4260 | newport,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4262 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s allowed port %d for forwarding to host %s port %d" , newport > 0 ? "Updating" : "Removing", newport, pset-> permitted_user[idx].host_to_connect, pset->permitted_user[ idx].port_to_connect) |
| 4261 | pset->permitted_user[idx].host_to_connect,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4262 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s allowed port %d for forwarding to host %s port %d" , newport > 0 ? "Updating" : "Removing", newport, pset-> permitted_user[idx].host_to_connect, pset->permitted_user[ idx].port_to_connect) |
| 4262 | pset->permitted_user[idx].port_to_connect)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4262 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s allowed port %d for forwarding to host %s port %d" , newport > 0 ? "Updating" : "Removing", newport, pset-> permitted_user[idx].host_to_connect, pset->permitted_user[ idx].port_to_connect); |
| 4263 | if (newport <= 0) |
| 4264 | fwd_perm_clear(&pset->permitted_user[idx]); |
| 4265 | else { |
| 4266 | pset->permitted_user[idx].listen_port = |
| 4267 | (ssh->compat & SSH_BUG_DYNAMIC_RPORT0x08000000) ? 0 : newport; |
| 4268 | } |
| 4269 | } |
| 4270 | |
| 4271 | /* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */ |
| 4272 | int |
| 4273 | permitopen_port(const char *p) |
| 4274 | { |
| 4275 | int port; |
| 4276 | |
| 4277 | if (strcmp(p, "*") == 0) |
| 4278 | return FWD_PERMIT_ANY_PORT0; |
| 4279 | if ((port = a2port(p)) > 0) |
| 4280 | return port; |
| 4281 | return -1; |
| 4282 | } |
| 4283 | |
| 4284 | /* Try to start non-blocking connect to next host in cctx list */ |
| 4285 | static int |
| 4286 | connect_next(struct channel_connect *cctx) |
| 4287 | { |
| 4288 | int sock, saved_errno; |
| 4289 | struct sockaddr_un *sunaddr; |
| 4290 | char ntop[NI_MAXHOST256]; |
| 4291 | char strport[MAXIMUM(NI_MAXSERV, sizeof(sunaddr->sun_path))(((32) > (sizeof(sunaddr->sun_path))) ? (32) : (sizeof( sunaddr->sun_path)))]; |
| 4292 | |
| 4293 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
| 4294 | switch (cctx->ai->ai_family) { |
| 4295 | case AF_UNIX1: |
| 4296 | /* unix:pathname instead of host:port */ |
| 4297 | sunaddr = (struct sockaddr_un *)cctx->ai->ai_addr; |
| 4298 | strlcpy(ntop, "unix", sizeof(ntop)); |
| 4299 | strlcpy(strport, sunaddr->sun_path, sizeof(strport)); |
| 4300 | break; |
| 4301 | case AF_INET2: |
| 4302 | case AF_INET624: |
| 4303 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
| 4304 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 4305 | NI_NUMERICHOST1|NI_NUMERICSERV2) != 0) { |
| 4306 | error("connect_next: getnameinfo failed")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4306 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect_next: getnameinfo failed" ); |
| 4307 | continue; |
| 4308 | } |
| 4309 | break; |
| 4310 | default: |
| 4311 | continue; |
| 4312 | } |
| 4313 | if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, |
| 4314 | cctx->ai->ai_protocol)) == -1) { |
| 4315 | if (cctx->ai->ai_next == NULL((void *)0)) |
| 4316 | error("socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4316 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "socket: %.100s", strerror ((*__errno()))); |
| 4317 | else |
| 4318 | verbose("socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4318 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "socket: %.100s", strerror ((*__errno()))); |
| 4319 | continue; |
| 4320 | } |
| 4321 | if (set_nonblock(sock) == -1) |
| 4322 | fatal_f("set_nonblock(%d)", sock)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4322 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "set_nonblock(%d)", sock ); |
| 4323 | if (connect(sock, cctx->ai->ai_addr, |
| 4324 | cctx->ai->ai_addrlen) == -1 && errno(*__errno()) != EINPROGRESS36) { |
| 4325 | debug("connect_next: host %.100s ([%.100s]:%s): "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4327 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "connect_next: host %.100s ([%.100s]:%s): " "%.100s", cctx->host, ntop, strport, strerror((*__errno() ))) |
| 4326 | "%.100s", cctx->host, ntop, strport,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4327 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "connect_next: host %.100s ([%.100s]:%s): " "%.100s", cctx->host, ntop, strport, strerror((*__errno() ))) |
| 4327 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4327 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "connect_next: host %.100s ([%.100s]:%s): " "%.100s", cctx->host, ntop, strport, strerror((*__errno() ))); |
| 4328 | saved_errno = errno(*__errno()); |
| 4329 | close(sock); |
| 4330 | errno(*__errno()) = saved_errno; |
| 4331 | continue; /* fail -- try next */ |
| 4332 | } |
| 4333 | if (cctx->ai->ai_family != AF_UNIX1) |
| 4334 | set_nodelay(sock); |
| 4335 | debug("connect_next: host %.100s ([%.100s]:%s) "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4336 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "connect_next: host %.100s ([%.100s]:%s) " "in progress, fd=%d", cctx->host, ntop, strport, sock) |
| 4336 | "in progress, fd=%d", cctx->host, ntop, strport, sock)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4336 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "connect_next: host %.100s ([%.100s]:%s) " "in progress, fd=%d", cctx->host, ntop, strport, sock); |
| 4337 | cctx->ai = cctx->ai->ai_next; |
| 4338 | return sock; |
| 4339 | } |
| 4340 | return -1; |
| 4341 | } |
| 4342 | |
| 4343 | static void |
| 4344 | channel_connect_ctx_free(struct channel_connect *cctx) |
| 4345 | { |
| 4346 | free(cctx->host); |
| 4347 | if (cctx->aitop) { |
| 4348 | if (cctx->aitop->ai_family == AF_UNIX1) |
| 4349 | free(cctx->aitop); |
| 4350 | else |
| 4351 | freeaddrinfo(cctx->aitop); |
| 4352 | } |
| 4353 | memset(cctx, 0, sizeof(*cctx)); |
| 4354 | } |
| 4355 | |
| 4356 | /* |
| 4357 | * Return connecting socket to remote host:port or local socket path, |
| 4358 | * passing back the failure reason if appropriate. |
| 4359 | */ |
| 4360 | static int |
| 4361 | connect_to_helper(struct ssh *ssh, const char *name, int port, int socktype, |
| 4362 | char *ctype, char *rname, struct channel_connect *cctx, |
| 4363 | int *reason, const char **errmsg) |
| 4364 | { |
| 4365 | struct addrinfo hints; |
| 4366 | int gaierr; |
| 4367 | int sock = -1; |
| 4368 | char strport[NI_MAXSERV32]; |
| 4369 | |
| 4370 | if (port == PORT_STREAMLOCAL-2) { |
| 4371 | struct sockaddr_un *sunaddr; |
| 4372 | struct addrinfo *ai; |
| 4373 | |
| 4374 | if (strlen(name) > sizeof(sunaddr->sun_path)) { |
| 4375 | error("%.100s: %.100s", name, strerror(ENAMETOOLONG))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4375 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%.100s: %.100s", name, strerror(63)); |
| 4376 | return -1; |
| 4377 | } |
| 4378 | |
| 4379 | /* |
| 4380 | * Fake up a struct addrinfo for AF_UNIX connections. |
| 4381 | * channel_connect_ctx_free() must check ai_family |
| 4382 | * and use free() not freeaddirinfo() for AF_UNIX. |
| 4383 | */ |
| 4384 | ai = xmalloc(sizeof(*ai) + sizeof(*sunaddr)); |
| 4385 | memset(ai, 0, sizeof(*ai) + sizeof(*sunaddr)); |
| 4386 | ai->ai_addr = (struct sockaddr *)(ai + 1); |
| 4387 | ai->ai_addrlen = sizeof(*sunaddr); |
| 4388 | ai->ai_family = AF_UNIX1; |
| 4389 | ai->ai_socktype = socktype; |
| 4390 | ai->ai_protocol = PF_UNSPEC0; |
| 4391 | sunaddr = (struct sockaddr_un *)ai->ai_addr; |
| 4392 | sunaddr->sun_family = AF_UNIX1; |
| 4393 | strlcpy(sunaddr->sun_path, name, sizeof(sunaddr->sun_path)); |
| 4394 | cctx->aitop = ai; |
| 4395 | } else { |
| 4396 | memset(&hints, 0, sizeof(hints)); |
| 4397 | hints.ai_family = ssh->chanctxt->IPv4or6; |
| 4398 | hints.ai_socktype = socktype; |
| 4399 | snprintf(strport, sizeof strport, "%d", port); |
| 4400 | if ((gaierr = getaddrinfo(name, strport, &hints, &cctx->aitop)) |
| 4401 | != 0) { |
| 4402 | if (errmsg != NULL((void *)0)) |
| 4403 | *errmsg = ssh_gai_strerror(gaierr); |
| 4404 | if (reason != NULL((void *)0)) |
| 4405 | *reason = SSH2_OPEN_CONNECT_FAILED2; |
| 4406 | error("connect_to %.100s: unknown host (%s)", name,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4407 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect_to %.100s: unknown host (%s)" , name, ssh_gai_strerror(gaierr)) |
| 4407 | ssh_gai_strerror(gaierr))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4407 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect_to %.100s: unknown host (%s)" , name, ssh_gai_strerror(gaierr)); |
| 4408 | return -1; |
| 4409 | } |
| 4410 | } |
| 4411 | |
| 4412 | cctx->host = xstrdup(name); |
| 4413 | cctx->port = port; |
| 4414 | cctx->ai = cctx->aitop; |
| 4415 | |
| 4416 | if ((sock = connect_next(cctx)) == -1) { |
| 4417 | error("connect to %.100s port %d failed: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4418 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect to %.100s port %d failed: %s" , name, port, strerror((*__errno()))) |
| 4418 | name, port, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4418 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect to %.100s port %d failed: %s" , name, port, strerror((*__errno()))); |
| 4419 | return -1; |
| 4420 | } |
| 4421 | |
| 4422 | return sock; |
| 4423 | } |
| 4424 | |
| 4425 | /* Return CONNECTING channel to remote host:port or local socket path */ |
| 4426 | static Channel * |
| 4427 | connect_to(struct ssh *ssh, const char *host, int port, |
| 4428 | char *ctype, char *rname) |
| 4429 | { |
| 4430 | struct channel_connect cctx; |
| 4431 | Channel *c; |
| 4432 | int sock; |
| 4433 | |
| 4434 | memset(&cctx, 0, sizeof(cctx)); |
| 4435 | sock = connect_to_helper(ssh, host, port, SOCK_STREAM1, ctype, rname, |
| 4436 | &cctx, NULL((void *)0), NULL((void *)0)); |
| 4437 | if (sock == -1) { |
| 4438 | channel_connect_ctx_free(&cctx); |
| 4439 | return NULL((void *)0); |
| 4440 | } |
| 4441 | c = channel_new(ssh, ctype, SSH_CHANNEL_CONNECTING12, sock, sock, -1, |
| 4442 | CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), 0, rname, 1); |
| 4443 | c->host_port = port; |
| 4444 | c->path = xstrdup(host); |
| 4445 | c->connect_ctx = cctx; |
| 4446 | |
| 4447 | return c; |
| 4448 | } |
| 4449 | |
| 4450 | /* |
| 4451 | * returns either the newly connected channel or the downstream channel |
| 4452 | * that needs to deal with this connection. |
| 4453 | */ |
| 4454 | Channel * |
| 4455 | channel_connect_by_listen_address(struct ssh *ssh, const char *listen_host, |
| 4456 | u_short listen_port, char *ctype, char *rname) |
| 4457 | { |
| 4458 | struct ssh_channels *sc = ssh->chanctxt; |
| 4459 | struct permission_set *pset = &sc->local_perms; |
| 4460 | u_int i; |
| 4461 | struct permission *perm; |
| 4462 | |
| 4463 | for (i = 0; i < pset->num_permitted_user; i++) { |
| 4464 | perm = &pset->permitted_user[i]; |
| 4465 | if (open_listen_match_tcpip(perm, |
| 4466 | listen_host, listen_port, 1)) { |
| 4467 | if (perm->downstream) |
| 4468 | return perm->downstream; |
| 4469 | if (perm->port_to_connect == 0) |
| 4470 | return rdynamic_connect_prepare(ssh, |
| 4471 | ctype, rname); |
| 4472 | return connect_to(ssh, |
| 4473 | perm->host_to_connect, perm->port_to_connect, |
| 4474 | ctype, rname); |
| 4475 | } |
| 4476 | } |
| 4477 | error("WARNING: Server requests forwarding for unknown listen_port %d",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4478 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "WARNING: Server requests forwarding for unknown listen_port %d" , listen_port) |
| 4478 | listen_port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4478 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "WARNING: Server requests forwarding for unknown listen_port %d" , listen_port); |
| 4479 | return NULL((void *)0); |
| 4480 | } |
| 4481 | |
| 4482 | Channel * |
| 4483 | channel_connect_by_listen_path(struct ssh *ssh, const char *path, |
| 4484 | char *ctype, char *rname) |
| 4485 | { |
| 4486 | struct ssh_channels *sc = ssh->chanctxt; |
| 4487 | struct permission_set *pset = &sc->local_perms; |
| 4488 | u_int i; |
| 4489 | struct permission *perm; |
| 4490 | |
| 4491 | for (i = 0; i < pset->num_permitted_user; i++) { |
| 4492 | perm = &pset->permitted_user[i]; |
| 4493 | if (open_listen_match_streamlocal(perm, path)) { |
| 4494 | return connect_to(ssh, |
| 4495 | perm->host_to_connect, perm->port_to_connect, |
| 4496 | ctype, rname); |
| 4497 | } |
| 4498 | } |
| 4499 | error("WARNING: Server requests forwarding for unknown path %.100s",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4500 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "WARNING: Server requests forwarding for unknown path %.100s" , path) |
| 4500 | path)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4500 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "WARNING: Server requests forwarding for unknown path %.100s" , path); |
| 4501 | return NULL((void *)0); |
| 4502 | } |
| 4503 | |
| 4504 | /* Check if connecting to that port is permitted and connect. */ |
| 4505 | Channel * |
| 4506 | channel_connect_to_port(struct ssh *ssh, const char *host, u_short port, |
| 4507 | char *ctype, char *rname, int *reason, const char **errmsg) |
| 4508 | { |
| 4509 | struct ssh_channels *sc = ssh->chanctxt; |
| 4510 | struct permission_set *pset = &sc->local_perms; |
| 4511 | struct channel_connect cctx; |
| 4512 | Channel *c; |
| 4513 | u_int i, permit, permit_adm = 1; |
| 4514 | int sock; |
| 4515 | struct permission *perm; |
| 4516 | |
| 4517 | permit = pset->all_permitted; |
| 4518 | if (!permit) { |
| 4519 | for (i = 0; i < pset->num_permitted_user; i++) { |
| 4520 | perm = &pset->permitted_user[i]; |
| 4521 | if (open_match(perm, host, port)) { |
| 4522 | permit = 1; |
| 4523 | break; |
| 4524 | } |
| 4525 | } |
| 4526 | } |
| 4527 | |
| 4528 | if (pset->num_permitted_admin > 0) { |
| 4529 | permit_adm = 0; |
| 4530 | for (i = 0; i < pset->num_permitted_admin; i++) { |
| 4531 | perm = &pset->permitted_admin[i]; |
| 4532 | if (open_match(perm, host, port)) { |
| 4533 | permit_adm = 1; |
| 4534 | break; |
| 4535 | } |
| 4536 | } |
| 4537 | } |
| 4538 | |
| 4539 | if (!permit || !permit_adm) { |
| 4540 | logit("Received request from %.100s port %d to connect to "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4542 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to connect to " "host %.100s port %d, but the request was denied.", ssh_remote_ipaddr (ssh), ssh_remote_port(ssh), host, port) |
| 4541 | "host %.100s port %d, but the request was denied.",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4542 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to connect to " "host %.100s port %d, but the request was denied.", ssh_remote_ipaddr (ssh), ssh_remote_port(ssh), host, port) |
| 4542 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), host, port)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4542 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request from %.100s port %d to connect to " "host %.100s port %d, but the request was denied.", ssh_remote_ipaddr (ssh), ssh_remote_port(ssh), host, port); |
| 4543 | if (reason != NULL((void *)0)) |
| 4544 | *reason = SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED1; |
| 4545 | return NULL((void *)0); |
| 4546 | } |
| 4547 | |
| 4548 | memset(&cctx, 0, sizeof(cctx)); |
| 4549 | sock = connect_to_helper(ssh, host, port, SOCK_STREAM1, ctype, rname, |
| 4550 | &cctx, reason, errmsg); |
| 4551 | if (sock == -1) { |
| 4552 | channel_connect_ctx_free(&cctx); |
| 4553 | return NULL((void *)0); |
| 4554 | } |
| 4555 | |
| 4556 | c = channel_new(ssh, ctype, SSH_CHANNEL_CONNECTING12, sock, sock, -1, |
| 4557 | CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), 0, rname, 1); |
| 4558 | c->host_port = port; |
| 4559 | c->path = xstrdup(host); |
| 4560 | c->connect_ctx = cctx; |
| 4561 | |
| 4562 | return c; |
| 4563 | } |
| 4564 | |
| 4565 | /* Check if connecting to that path is permitted and connect. */ |
| 4566 | Channel * |
| 4567 | channel_connect_to_path(struct ssh *ssh, const char *path, |
| 4568 | char *ctype, char *rname) |
| 4569 | { |
| 4570 | struct ssh_channels *sc = ssh->chanctxt; |
| 4571 | struct permission_set *pset = &sc->local_perms; |
| 4572 | u_int i, permit, permit_adm = 1; |
| 4573 | struct permission *perm; |
| 4574 | |
| 4575 | permit = pset->all_permitted; |
| 4576 | if (!permit) { |
| 4577 | for (i = 0; i < pset->num_permitted_user; i++) { |
| 4578 | perm = &pset->permitted_user[i]; |
| 4579 | if (open_match(perm, path, PORT_STREAMLOCAL-2)) { |
| 4580 | permit = 1; |
| 4581 | break; |
| 4582 | } |
| 4583 | } |
| 4584 | } |
| 4585 | |
| 4586 | if (pset->num_permitted_admin > 0) { |
| 4587 | permit_adm = 0; |
| 4588 | for (i = 0; i < pset->num_permitted_admin; i++) { |
| 4589 | perm = &pset->permitted_admin[i]; |
| 4590 | if (open_match(perm, path, PORT_STREAMLOCAL-2)) { |
| 4591 | permit_adm = 1; |
| 4592 | break; |
| 4593 | } |
| 4594 | } |
| 4595 | } |
| 4596 | |
| 4597 | if (!permit || !permit_adm) { |
| 4598 | logit("Received request to connect to path %.100s, "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4599 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request to connect to path %.100s, " "but the request was denied.", path) |
| 4599 | "but the request was denied.", path)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4599 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received request to connect to path %.100s, " "but the request was denied.", path); |
| 4600 | return NULL((void *)0); |
| 4601 | } |
| 4602 | return connect_to(ssh, path, PORT_STREAMLOCAL-2, ctype, rname); |
| 4603 | } |
| 4604 | |
| 4605 | void |
| 4606 | channel_send_window_changes(struct ssh *ssh) |
| 4607 | { |
| 4608 | struct ssh_channels *sc = ssh->chanctxt; |
| 4609 | struct winsize ws; |
| 4610 | int r; |
| 4611 | u_int i; |
| 4612 | |
| 4613 | for (i = 0; i < sc->channels_alloc; i++) { |
| 4614 | if (sc->channels[i] == NULL((void *)0) || !sc->channels[i]->client_tty || |
| 4615 | sc->channels[i]->type != SSH_CHANNEL_OPEN4) |
| 4616 | continue; |
| 4617 | if (ioctl(sc->channels[i]->rfd, TIOCGWINSZ((unsigned long)0x40000000 | ((sizeof(struct winsize) & 0x1fff ) << 16) | ((('t')) << 8) | ((104))), &ws) == -1) |
| 4618 | continue; |
| 4619 | channel_request_start(ssh, i, "window-change", 0); |
| 4620 | if ((r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 || |
| 4621 | (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 || |
| 4622 | (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 || |
| 4623 | (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0 || |
| 4624 | (r = sshpkt_send(ssh)) != 0) |
| 4625 | fatal_fr(r, "channel %u; send window-change", i)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4625 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %u; send window-change" , i); |
| 4626 | } |
| 4627 | } |
| 4628 | |
| 4629 | /* Return RDYNAMIC_OPEN channel: channel allows SOCKS, but is not connected */ |
| 4630 | static Channel * |
| 4631 | rdynamic_connect_prepare(struct ssh *ssh, char *ctype, char *rname) |
| 4632 | { |
| 4633 | Channel *c; |
| 4634 | int r; |
| 4635 | |
| 4636 | c = channel_new(ssh, ctype, SSH_CHANNEL_RDYNAMIC_OPEN21, -1, -1, -1, |
| 4637 | CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), 0, rname, 1); |
| 4638 | c->host_port = 0; |
| 4639 | c->path = NULL((void *)0); |
| 4640 | |
| 4641 | /* |
| 4642 | * We need to open the channel before we have a FD, |
| 4643 | * so that we can get SOCKS header from peer. |
| 4644 | */ |
| 4645 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION91)) != 0 || |
| 4646 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 4647 | (r = sshpkt_put_u32(ssh, c->self)) != 0 || |
| 4648 | (r = sshpkt_put_u32(ssh, c->local_window)) != 0 || |
| 4649 | (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0) |
| 4650 | fatal_fr(r, "channel %i; confirm", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4650 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "channel %i; confirm", c ->self); |
| 4651 | return c; |
| 4652 | } |
| 4653 | |
| 4654 | /* Return CONNECTING socket to remote host:port or local socket path */ |
| 4655 | static int |
| 4656 | rdynamic_connect_finish(struct ssh *ssh, Channel *c) |
| 4657 | { |
| 4658 | struct ssh_channels *sc = ssh->chanctxt; |
| 4659 | struct permission_set *pset = &sc->local_perms; |
| 4660 | struct permission *perm; |
| 4661 | struct channel_connect cctx; |
| 4662 | u_int i, permit_adm = 1; |
| 4663 | int sock; |
| 4664 | |
| 4665 | if (pset->num_permitted_admin > 0) { |
| 4666 | permit_adm = 0; |
| 4667 | for (i = 0; i < pset->num_permitted_admin; i++) { |
| 4668 | perm = &pset->permitted_admin[i]; |
| 4669 | if (open_match(perm, c->path, c->host_port)) { |
| 4670 | permit_adm = 1; |
| 4671 | break; |
| 4672 | } |
| 4673 | } |
| 4674 | } |
| 4675 | if (!permit_adm) { |
| 4676 | debug_f("requested forward not permitted")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4676 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "requested forward not permitted" ); |
| 4677 | return -1; |
| 4678 | } |
| 4679 | |
| 4680 | memset(&cctx, 0, sizeof(cctx)); |
| 4681 | sock = connect_to_helper(ssh, c->path, c->host_port, SOCK_STREAM1, NULL((void *)0), |
| 4682 | NULL((void *)0), &cctx, NULL((void *)0), NULL((void *)0)); |
| 4683 | if (sock == -1) |
| 4684 | channel_connect_ctx_free(&cctx); |
| 4685 | else { |
| 4686 | /* similar to SSH_CHANNEL_CONNECTING but we've already sent the open */ |
| 4687 | c->type = SSH_CHANNEL_RDYNAMIC_FINISH22; |
| 4688 | c->connect_ctx = cctx; |
| 4689 | channel_register_fds(ssh, c, sock, sock, -1, 0, 1, 0); |
| 4690 | } |
| 4691 | return sock; |
| 4692 | } |
| 4693 | |
| 4694 | /* -- X11 forwarding */ |
| 4695 | |
| 4696 | /* |
| 4697 | * Creates an internet domain socket for listening for X11 connections. |
| 4698 | * Returns 0 and a suitable display number for the DISPLAY variable |
| 4699 | * stored in display_numberp , or -1 if an error occurs. |
| 4700 | */ |
| 4701 | int |
| 4702 | x11_create_display_inet(struct ssh *ssh, int x11_display_offset, |
| 4703 | int x11_use_localhost, int single_connection, |
| 4704 | u_int *display_numberp, int **chanids) |
| 4705 | { |
| 4706 | Channel *nc = NULL((void *)0); |
| 4707 | int display_number, sock; |
| 4708 | u_short port; |
| 4709 | struct addrinfo hints, *ai, *aitop; |
| 4710 | char strport[NI_MAXSERV32]; |
| 4711 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS10]; |
| 4712 | |
| 4713 | if (chanids == NULL((void *)0)) |
| 4714 | return -1; |
| 4715 | |
| 4716 | for (display_number = x11_display_offset; |
| 4717 | display_number < MAX_DISPLAYS1000; |
| 4718 | display_number++) { |
| 4719 | port = 6000 + display_number; |
| 4720 | memset(&hints, 0, sizeof(hints)); |
| 4721 | hints.ai_family = ssh->chanctxt->IPv4or6; |
| 4722 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE1; |
| 4723 | hints.ai_socktype = SOCK_STREAM1; |
| 4724 | snprintf(strport, sizeof strport, "%d", port); |
| 4725 | if ((gaierr = getaddrinfo(NULL((void *)0), strport, |
| 4726 | &hints, &aitop)) != 0) { |
| 4727 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4727 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "getaddrinfo: %.100s", ssh_gai_strerror (gaierr)); |
| 4728 | return -1; |
| 4729 | } |
| 4730 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 4731 | if (ai->ai_family != AF_INET2 && |
| 4732 | ai->ai_family != AF_INET624) |
| 4733 | continue; |
| 4734 | sock = socket(ai->ai_family, ai->ai_socktype, |
| 4735 | ai->ai_protocol); |
| 4736 | if (sock == -1) { |
| 4737 | error("socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4737 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "socket: %.100s", strerror ((*__errno()))); |
| 4738 | freeaddrinfo(aitop); |
| 4739 | return -1; |
| 4740 | } |
| 4741 | set_reuseaddr(sock); |
| 4742 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) == -1) { |
| 4743 | debug2_f("bind port %d: %.100s", port,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4744 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "bind port %d: %.100s" , port, strerror((*__errno()))) |
| 4744 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4744 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "bind port %d: %.100s" , port, strerror((*__errno()))); |
| 4745 | close(sock); |
| 4746 | for (n = 0; n < num_socks; n++) |
| 4747 | close(socks[n]); |
| 4748 | num_socks = 0; |
| 4749 | break; |
| 4750 | } |
| 4751 | socks[num_socks++] = sock; |
| 4752 | if (num_socks == NUM_SOCKS10) |
| 4753 | break; |
| 4754 | } |
| 4755 | freeaddrinfo(aitop); |
| 4756 | if (num_socks > 0) |
| 4757 | break; |
| 4758 | } |
| 4759 | if (display_number >= MAX_DISPLAYS1000) { |
| 4760 | error("Failed to allocate internet-domain X11 display socket.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4760 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Failed to allocate internet-domain X11 display socket." ); |
| 4761 | return -1; |
| 4762 | } |
| 4763 | /* Start listening for connections on the socket. */ |
| 4764 | for (n = 0; n < num_socks; n++) { |
| 4765 | sock = socks[n]; |
| 4766 | if (listen(sock, SSH_LISTEN_BACKLOG128) == -1) { |
| 4767 | error("listen: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4767 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "listen: %.100s", strerror ((*__errno()))); |
| 4768 | close(sock); |
| 4769 | return -1; |
| 4770 | } |
| 4771 | } |
| 4772 | |
| 4773 | /* Allocate a channel for each socket. */ |
| 4774 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
| 4775 | for (n = 0; n < num_socks; n++) { |
| 4776 | sock = socks[n]; |
| 4777 | nc = channel_new(ssh, "x11 listener", |
| 4778 | SSH_CHANNEL_X11_LISTENER1, sock, sock, -1, |
| 4779 | CHAN_X11_WINDOW_DEFAULT(4*(16*1024)), CHAN_X11_PACKET_DEFAULT(16*1024), |
| 4780 | 0, "X11 inet listener", 1); |
| 4781 | nc->single_connection = single_connection; |
| 4782 | (*chanids)[n] = nc->self; |
| 4783 | } |
| 4784 | (*chanids)[n] = -1; |
| 4785 | |
| 4786 | /* Return the display number for the DISPLAY environment variable. */ |
| 4787 | *display_numberp = display_number; |
| 4788 | return 0; |
| 4789 | } |
| 4790 | |
| 4791 | static int |
| 4792 | connect_local_xsocket(u_int dnr) |
| 4793 | { |
| 4794 | int sock; |
| 4795 | struct sockaddr_un addr; |
| 4796 | |
| 4797 | sock = socket(AF_UNIX1, SOCK_STREAM1, 0); |
| 4798 | if (sock == -1) |
| 4799 | error("socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4799 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "socket: %.100s", strerror ((*__errno()))); |
| 4800 | memset(&addr, 0, sizeof(addr)); |
| 4801 | addr.sun_family = AF_UNIX1; |
| 4802 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X"/tmp/.X11-unix/X%u", dnr); |
| 4803 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
| 4804 | return sock; |
| 4805 | close(sock); |
| 4806 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4806 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect %.100s: %.100s" , addr.sun_path, strerror((*__errno()))); |
| 4807 | return -1; |
| 4808 | } |
| 4809 | |
| 4810 | int |
| 4811 | x11_connect_display(struct ssh *ssh) |
| 4812 | { |
| 4813 | u_int display_number; |
| 4814 | const char *display; |
| 4815 | char buf[1024], *cp; |
| 4816 | struct addrinfo hints, *ai, *aitop; |
| 4817 | char strport[NI_MAXSERV32]; |
| 4818 | int gaierr, sock = 0; |
| 4819 | |
| 4820 | /* Try to open a socket for the local X server. */ |
| 4821 | display = getenv("DISPLAY"); |
| 4822 | if (!display) { |
| 4823 | error("DISPLAY not set.")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4823 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "DISPLAY not set."); |
| 4824 | return -1; |
| 4825 | } |
| 4826 | /* |
| 4827 | * Now we decode the value of the DISPLAY variable and make a |
| 4828 | * connection to the real X server. |
| 4829 | */ |
| 4830 | |
| 4831 | /* |
| 4832 | * Check if it is a unix domain socket. Unix domain displays are in |
| 4833 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] |
| 4834 | */ |
| 4835 | if (strncmp(display, "unix:", 5) == 0 || |
| 4836 | display[0] == ':') { |
| 4837 | /* Connect to the unix domain socket. */ |
| 4838 | if (sscanf(strrchr(display, ':') + 1, "%u", |
| 4839 | &display_number) != 1) { |
| 4840 | error("Could not parse display number from DISPLAY: "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4841 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Could not parse display number from DISPLAY: " "%.100s", display) |
| 4841 | "%.100s", display)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4841 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Could not parse display number from DISPLAY: " "%.100s", display); |
| 4842 | return -1; |
| 4843 | } |
| 4844 | /* Create a socket. */ |
| 4845 | sock = connect_local_xsocket(display_number); |
| 4846 | if (sock < 0) |
| 4847 | return -1; |
| 4848 | |
| 4849 | /* OK, we now have a connection to the display. */ |
| 4850 | return sock; |
| 4851 | } |
| 4852 | /* |
| 4853 | * Connect to an inet socket. The DISPLAY value is supposedly |
| 4854 | * hostname:d[.s], where hostname may also be numeric IP address. |
| 4855 | */ |
| 4856 | strlcpy(buf, display, sizeof(buf)); |
| 4857 | cp = strchr(buf, ':'); |
| 4858 | if (!cp) { |
| 4859 | error("Could not find ':' in DISPLAY: %.100s", display)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4859 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Could not find ':' in DISPLAY: %.100s" , display); |
| 4860 | return -1; |
| 4861 | } |
| 4862 | *cp = 0; |
| 4863 | /* |
| 4864 | * buf now contains the host name. But first we parse the |
| 4865 | * display number. |
| 4866 | */ |
| 4867 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
| 4868 | error("Could not parse display number from DISPLAY: %.100s",sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4869 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Could not parse display number from DISPLAY: %.100s" , display) |
| 4869 | display)sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4869 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Could not parse display number from DISPLAY: %.100s" , display); |
| 4870 | return -1; |
| 4871 | } |
| 4872 | |
| 4873 | /* Look up the host address */ |
| 4874 | memset(&hints, 0, sizeof(hints)); |
| 4875 | hints.ai_family = ssh->chanctxt->IPv4or6; |
| 4876 | hints.ai_socktype = SOCK_STREAM1; |
| 4877 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
| 4878 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
| 4879 | error("%.100s: unknown host. (%s)", buf,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4880 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%.100s: unknown host. (%s)" , buf, ssh_gai_strerror(gaierr)) |
| 4880 | ssh_gai_strerror(gaierr))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4880 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%.100s: unknown host. (%s)" , buf, ssh_gai_strerror(gaierr)); |
| 4881 | return -1; |
| 4882 | } |
| 4883 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 4884 | /* Create a socket. */ |
| 4885 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
| 4886 | if (sock == -1) { |
| 4887 | debug2("socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4887 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "socket: %.100s", strerror ((*__errno()))); |
| 4888 | continue; |
| 4889 | } |
| 4890 | /* Connect it to the display. */ |
| 4891 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) == -1) { |
| 4892 | debug2("connect %.100s port %u: %.100s", buf,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4893 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "connect %.100s port %u: %.100s" , buf, 6000 + display_number, strerror((*__errno()))) |
| 4893 | 6000 + display_number, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4893 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "connect %.100s port %u: %.100s" , buf, 6000 + display_number, strerror((*__errno()))); |
| 4894 | close(sock); |
| 4895 | continue; |
| 4896 | } |
| 4897 | /* Success */ |
| 4898 | break; |
| 4899 | } |
| 4900 | freeaddrinfo(aitop); |
| 4901 | if (!ai) { |
| 4902 | error("connect %.100s port %u: %.100s", buf,sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4903 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect %.100s port %u: %.100s" , buf, 6000 + display_number, strerror((*__errno()))) |
| 4903 | 6000 + display_number, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4903 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "connect %.100s port %u: %.100s" , buf, 6000 + display_number, strerror((*__errno()))); |
| 4904 | return -1; |
| 4905 | } |
| 4906 | set_nodelay(sock); |
| 4907 | return sock; |
| 4908 | } |
| 4909 | |
| 4910 | /* |
| 4911 | * Requests forwarding of X11 connections, generates fake authentication |
| 4912 | * data, and enables authentication spoofing. |
| 4913 | * This should be called in the client only. |
| 4914 | */ |
| 4915 | void |
| 4916 | x11_request_forwarding_with_spoofing(struct ssh *ssh, int client_session_id, |
| 4917 | const char *disp, const char *proto, const char *data, int want_reply) |
| 4918 | { |
| 4919 | struct ssh_channels *sc = ssh->chanctxt; |
| 4920 | u_int data_len = (u_int) strlen(data) / 2; |
| 4921 | u_int i, value; |
| 4922 | const char *cp; |
| 4923 | char *new_data; |
| 4924 | int r, screen_number; |
| 4925 | |
| 4926 | if (sc->x11_saved_display == NULL((void *)0)) |
| 4927 | sc->x11_saved_display = xstrdup(disp); |
| 4928 | else if (strcmp(disp, sc->x11_saved_display) != 0) { |
| 4929 | error("x11_request_forwarding_with_spoofing: different "sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4930 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "x11_request_forwarding_with_spoofing: different " "$DISPLAY already forwarded") |
| 4930 | "$DISPLAY already forwarded")sshlog("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4930 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "x11_request_forwarding_with_spoofing: different " "$DISPLAY already forwarded"); |
| 4931 | return; |
| 4932 | } |
| 4933 | |
| 4934 | cp = strchr(disp, ':'); |
| 4935 | if (cp) |
| 4936 | cp = strchr(cp, '.'); |
| 4937 | if (cp) |
| 4938 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL((void *)0)); |
| 4939 | else |
| 4940 | screen_number = 0; |
| 4941 | |
| 4942 | if (sc->x11_saved_proto == NULL((void *)0)) { |
| 4943 | /* Save protocol name. */ |
| 4944 | sc->x11_saved_proto = xstrdup(proto); |
| 4945 | |
| 4946 | /* Extract real authentication data. */ |
| 4947 | sc->x11_saved_data = xmalloc(data_len); |
| 4948 | for (i = 0; i < data_len; i++) { |
| 4949 | if (sscanf(data + 2 * i, "%2x", &value) != 1) { |
| 4950 | fatal("x11_request_forwarding: bad "sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4951 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "x11_request_forwarding: bad " "authentication data: %.100s", data) |
| 4951 | "authentication data: %.100s", data)sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4951 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "x11_request_forwarding: bad " "authentication data: %.100s", data); |
| 4952 | } |
| 4953 | sc->x11_saved_data[i] = value; |
| 4954 | } |
| 4955 | sc->x11_saved_data_len = data_len; |
| 4956 | |
| 4957 | /* Generate fake data of the same length. */ |
| 4958 | sc->x11_fake_data = xmalloc(data_len); |
| 4959 | arc4random_buf(sc->x11_fake_data, data_len); |
| 4960 | sc->x11_fake_data_len = data_len; |
| 4961 | } |
| 4962 | |
| 4963 | /* Convert the fake data into hex. */ |
| 4964 | new_data = tohex(sc->x11_fake_data, data_len); |
| 4965 | |
| 4966 | /* Send the request packet. */ |
| 4967 | channel_request_start(ssh, client_session_id, "x11-req", want_reply); |
| 4968 | if ((r = sshpkt_put_u8(ssh, 0)) != 0 || /* bool: single connection */ |
| 4969 | (r = sshpkt_put_cstring(ssh, proto)) != 0 || |
| 4970 | (r = sshpkt_put_cstring(ssh, new_data)) != 0 || |
| 4971 | (r = sshpkt_put_u32(ssh, screen_number)) != 0 || |
| 4972 | (r = sshpkt_send(ssh)) != 0 || |
| 4973 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 4974 | fatal_fr(r, "send x11-req")sshfatal("/usr/src/usr.bin/ssh/ssh/../channels.c", __func__, 4974 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send x11-req"); |
| 4975 | free(new_data); |
| 4976 | } |