| File: | src/usr.bin/ssh/sshd/../sshd.c |
| Warning: | line 522, column 18 Access to field 'm_pid' results in a dereference of a null pointer (loaded from variable 'pmonitor') |
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| 1 | /* $OpenBSD: sshd.c,v 1.582 2021/11/18 03:07:59 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 program is the ssh daemon. It listens for connections from clients, | ||||||
| 7 | * and performs authentication, executes use commands or shell, and forwards | ||||||
| 8 | * information to/from the application to the user client over an encrypted | ||||||
| 9 | * connection. This can also handle forwarding of X11, TCP/IP, and | ||||||
| 10 | * authentication agent connections. | ||||||
| 11 | * | ||||||
| 12 | * As far as I am concerned, the code I have written for this software | ||||||
| 13 | * can be used freely for any purpose. Any derived versions of this | ||||||
| 14 | * software must be clearly marked as such, and if the derived work is | ||||||
| 15 | * incompatible with the protocol description in the RFC file, it must be | ||||||
| 16 | * called by a name other than "ssh" or "Secure Shell". | ||||||
| 17 | * | ||||||
| 18 | * SSH2 implementation: | ||||||
| 19 | * Privilege Separation: | ||||||
| 20 | * | ||||||
| 21 | * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved. | ||||||
| 22 | * Copyright (c) 2002 Niels Provos. All rights reserved. | ||||||
| 23 | * | ||||||
| 24 | * Redistribution and use in source and binary forms, with or without | ||||||
| 25 | * modification, are permitted provided that the following conditions | ||||||
| 26 | * are met: | ||||||
| 27 | * 1. Redistributions of source code must retain the above copyright | ||||||
| 28 | * notice, this list of conditions and the following disclaimer. | ||||||
| 29 | * 2. Redistributions in binary form must reproduce the above copyright | ||||||
| 30 | * notice, this list of conditions and the following disclaimer in the | ||||||
| 31 | * documentation and/or other materials provided with the distribution. | ||||||
| 32 | * | ||||||
| 33 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||||||
| 34 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||||||
| 35 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||||||
| 36 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||||||
| 37 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||||||
| 38 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||||||
| 39 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||||||
| 40 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||||||
| 41 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||||||
| 42 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||||||
| 43 | */ | ||||||
| 44 | |||||||
| 45 | #include <sys/types.h> | ||||||
| 46 | #include <sys/ioctl.h> | ||||||
| 47 | #include <sys/wait.h> | ||||||
| 48 | #include <sys/tree.h> | ||||||
| 49 | #include <sys/stat.h> | ||||||
| 50 | #include <sys/socket.h> | ||||||
| 51 | #include <sys/time.h> | ||||||
| 52 | #include <sys/queue.h> | ||||||
| 53 | |||||||
| 54 | #include <errno(*__errno()).h> | ||||||
| 55 | #include <fcntl.h> | ||||||
| 56 | #include <netdb.h> | ||||||
| 57 | #include <paths.h> | ||||||
| 58 | #include <poll.h> | ||||||
| 59 | #include <pwd.h> | ||||||
| 60 | #include <signal.h> | ||||||
| 61 | #include <stdio.h> | ||||||
| 62 | #include <stdlib.h> | ||||||
| 63 | #include <string.h> | ||||||
| 64 | #include <stdarg.h> | ||||||
| 65 | #include <unistd.h> | ||||||
| 66 | #include <limits.h> | ||||||
| 67 | |||||||
| 68 | #ifdef WITH_OPENSSL1 | ||||||
| 69 | #include <openssl/bn.h> | ||||||
| 70 | #endif | ||||||
| 71 | |||||||
| 72 | #include "xmalloc.h" | ||||||
| 73 | #include "ssh.h" | ||||||
| 74 | #include "ssh2.h" | ||||||
| 75 | #include "sshpty.h" | ||||||
| 76 | #include "packet.h" | ||||||
| 77 | #include "log.h" | ||||||
| 78 | #include "sshbuf.h" | ||||||
| 79 | #include "misc.h" | ||||||
| 80 | #include "match.h" | ||||||
| 81 | #include "servconf.h" | ||||||
| 82 | #include "uidswap.h" | ||||||
| 83 | #include "compat.h" | ||||||
| 84 | #include "cipher.h" | ||||||
| 85 | #include "digest.h" | ||||||
| 86 | #include "sshkey.h" | ||||||
| 87 | #include "kex.h" | ||||||
| 88 | #include "myproposal.h" | ||||||
| 89 | #include "authfile.h" | ||||||
| 90 | #include "pathnames.h" | ||||||
| 91 | #include "atomicio.h" | ||||||
| 92 | #include "canohost.h" | ||||||
| 93 | #include "hostfile.h" | ||||||
| 94 | #include "auth.h" | ||||||
| 95 | #include "authfd.h" | ||||||
| 96 | #include "msg.h" | ||||||
| 97 | #include "dispatch.h" | ||||||
| 98 | #include "channels.h" | ||||||
| 99 | #include "session.h" | ||||||
| 100 | #include "monitor.h" | ||||||
| 101 | #ifdef GSSAPI | ||||||
| 102 | #include "ssh-gss.h" | ||||||
| 103 | #endif | ||||||
| 104 | #include "monitor_wrap.h" | ||||||
| 105 | #include "ssh-sandbox.h" | ||||||
| 106 | #include "auth-options.h" | ||||||
| 107 | #include "version.h" | ||||||
| 108 | #include "ssherr.h" | ||||||
| 109 | #include "sk-api.h" | ||||||
| 110 | #include "srclimit.h" | ||||||
| 111 | #include "dh.h" | ||||||
| 112 | |||||||
| 113 | /* Re-exec fds */ | ||||||
| 114 | #define REEXEC_DEVCRYPTO_RESERVED_FD(2 + 1) (STDERR_FILENO2 + 1) | ||||||
| 115 | #define REEXEC_STARTUP_PIPE_FD(2 + 2) (STDERR_FILENO2 + 2) | ||||||
| 116 | #define REEXEC_CONFIG_PASS_FD(2 + 3) (STDERR_FILENO2 + 3) | ||||||
| 117 | #define REEXEC_MIN_FREE_FD(2 + 4) (STDERR_FILENO2 + 4) | ||||||
| 118 | |||||||
| 119 | extern char *__progname; | ||||||
| 120 | |||||||
| 121 | /* Server configuration options. */ | ||||||
| 122 | ServerOptions options; | ||||||
| 123 | |||||||
| 124 | /* Name of the server configuration file. */ | ||||||
| 125 | char *config_file_name = _PATH_SERVER_CONFIG_FILE"/etc" "/ssh" "/sshd_config"; | ||||||
| 126 | |||||||
| 127 | /* | ||||||
| 128 | * Debug mode flag. This can be set on the command line. If debug | ||||||
| 129 | * mode is enabled, extra debugging output will be sent to the system | ||||||
| 130 | * log, the daemon will not go to background, and will exit after processing | ||||||
| 131 | * the first connection. | ||||||
| 132 | */ | ||||||
| 133 | int debug_flag = 0; | ||||||
| 134 | |||||||
| 135 | /* | ||||||
| 136 | * Indicating that the daemon should only test the configuration and keys. | ||||||
| 137 | * If test_flag > 1 ("-T" flag), then sshd will also dump the effective | ||||||
| 138 | * configuration, optionally using connection information provided by the | ||||||
| 139 | * "-C" flag. | ||||||
| 140 | */ | ||||||
| 141 | static int test_flag = 0; | ||||||
| 142 | |||||||
| 143 | /* Flag indicating that the daemon is being started from inetd. */ | ||||||
| 144 | static int inetd_flag = 0; | ||||||
| 145 | |||||||
| 146 | /* Flag indicating that sshd should not detach and become a daemon. */ | ||||||
| 147 | static int no_daemon_flag = 0; | ||||||
| 148 | |||||||
| 149 | /* debug goes to stderr unless inetd_flag is set */ | ||||||
| 150 | static int log_stderr = 0; | ||||||
| 151 | |||||||
| 152 | /* Saved arguments to main(). */ | ||||||
| 153 | static char **saved_argv; | ||||||
| 154 | |||||||
| 155 | /* re-exec */ | ||||||
| 156 | static int rexeced_flag = 0; | ||||||
| 157 | static int rexec_flag = 1; | ||||||
| 158 | static int rexec_argc = 0; | ||||||
| 159 | static char **rexec_argv; | ||||||
| 160 | |||||||
| 161 | /* | ||||||
| 162 | * The sockets that the server is listening; this is used in the SIGHUP | ||||||
| 163 | * signal handler. | ||||||
| 164 | */ | ||||||
| 165 | #define MAX_LISTEN_SOCKS16 16 | ||||||
| 166 | static int listen_socks[MAX_LISTEN_SOCKS16]; | ||||||
| 167 | static int num_listen_socks = 0; | ||||||
| 168 | |||||||
| 169 | /* Daemon's agent connection */ | ||||||
| 170 | int auth_sock = -1; | ||||||
| 171 | static int have_agent = 0; | ||||||
| 172 | |||||||
| 173 | /* | ||||||
| 174 | * Any really sensitive data in the application is contained in this | ||||||
| 175 | * structure. The idea is that this structure could be locked into memory so | ||||||
| 176 | * that the pages do not get written into swap. However, there are some | ||||||
| 177 | * problems. The private key contains BIGNUMs, and we do not (in principle) | ||||||
| 178 | * have access to the internals of them, and locking just the structure is | ||||||
| 179 | * not very useful. Currently, memory locking is not implemented. | ||||||
| 180 | */ | ||||||
| 181 | struct { | ||||||
| 182 | struct sshkey **host_keys; /* all private host keys */ | ||||||
| 183 | struct sshkey **host_pubkeys; /* all public host keys */ | ||||||
| 184 | struct sshkey **host_certificates; /* all public host certificates */ | ||||||
| 185 | int have_ssh2_key; | ||||||
| 186 | } sensitive_data; | ||||||
| 187 | |||||||
| 188 | /* This is set to true when a signal is received. */ | ||||||
| 189 | static volatile sig_atomic_t received_sighup = 0; | ||||||
| 190 | static volatile sig_atomic_t received_sigterm = 0; | ||||||
| 191 | |||||||
| 192 | /* record remote hostname or ip */ | ||||||
| 193 | u_int utmp_len = HOST_NAME_MAX255+1; | ||||||
| 194 | |||||||
| 195 | /* | ||||||
| 196 | * startup_pipes/flags are used for tracking children of the listening sshd | ||||||
| 197 | * process early in their lifespans. This tracking is needed for three things: | ||||||
| 198 | * | ||||||
| 199 | * 1) Implementing the MaxStartups limit of concurrent unauthenticated | ||||||
| 200 | * connections. | ||||||
| 201 | * 2) Avoiding a race condition for SIGHUP processing, where child processes | ||||||
| 202 | * may have listen_socks open that could collide with main listener process | ||||||
| 203 | * after it restarts. | ||||||
| 204 | * 3) Ensuring that rexec'd sshd processes have received their initial state | ||||||
| 205 | * from the parent listen process before handling SIGHUP. | ||||||
| 206 | * | ||||||
| 207 | * Child processes signal that they have completed closure of the listen_socks | ||||||
| 208 | * and (if applicable) received their rexec state by sending a char over their | ||||||
| 209 | * sock. Child processes signal that authentication has completed by closing | ||||||
| 210 | * the sock (or by exiting). | ||||||
| 211 | */ | ||||||
| 212 | static int *startup_pipes = NULL((void*)0); | ||||||
| 213 | static int *startup_flags = NULL((void*)0); /* Indicates child closed listener */ | ||||||
| 214 | static int startup_pipe = -1; /* in child */ | ||||||
| 215 | |||||||
| 216 | /* variables used for privilege separation */ | ||||||
| 217 | int use_privsep = -1; | ||||||
| 218 | struct monitor *pmonitor = NULL((void*)0); | ||||||
| 219 | int privsep_is_preauth = 1; | ||||||
| 220 | |||||||
| 221 | /* global connection state and authentication contexts */ | ||||||
| 222 | Authctxt *the_authctxt = NULL((void*)0); | ||||||
| 223 | struct ssh *the_active_state; | ||||||
| 224 | |||||||
| 225 | /* global key/cert auth options. XXX move to permanent ssh->authctxt? */ | ||||||
| 226 | struct sshauthopt *auth_opts = NULL((void*)0); | ||||||
| 227 | |||||||
| 228 | /* sshd_config buffer */ | ||||||
| 229 | struct sshbuf *cfg; | ||||||
| 230 | |||||||
| 231 | /* Included files from the configuration file */ | ||||||
| 232 | struct include_list includes = TAILQ_HEAD_INITIALIZER(includes){ ((void*)0), &(includes).tqh_first }; | ||||||
| 233 | |||||||
| 234 | /* message to be displayed after login */ | ||||||
| 235 | struct sshbuf *loginmsg; | ||||||
| 236 | |||||||
| 237 | /* Prototypes for various functions defined later in this file. */ | ||||||
| 238 | void destroy_sensitive_data(void); | ||||||
| 239 | void demote_sensitive_data(void); | ||||||
| 240 | static void do_ssh2_kex(struct ssh *); | ||||||
| 241 | |||||||
| 242 | static char *listener_proctitle; | ||||||
| 243 | |||||||
| 244 | /* | ||||||
| 245 | * Close all listening sockets | ||||||
| 246 | */ | ||||||
| 247 | static void | ||||||
| 248 | close_listen_socks(void) | ||||||
| 249 | { | ||||||
| 250 | int i; | ||||||
| 251 | |||||||
| 252 | for (i = 0; i < num_listen_socks; i++) | ||||||
| 253 | close(listen_socks[i]); | ||||||
| 254 | num_listen_socks = 0; | ||||||
| 255 | } | ||||||
| 256 | |||||||
| 257 | static void | ||||||
| 258 | close_startup_pipes(void) | ||||||
| 259 | { | ||||||
| 260 | int i; | ||||||
| 261 | |||||||
| 262 | if (startup_pipes) | ||||||
| 263 | for (i = 0; i < options.max_startups; i++) | ||||||
| 264 | if (startup_pipes[i] != -1) | ||||||
| 265 | close(startup_pipes[i]); | ||||||
| 266 | } | ||||||
| 267 | |||||||
| 268 | /* | ||||||
| 269 | * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP; | ||||||
| 270 | * the effect is to reread the configuration file (and to regenerate | ||||||
| 271 | * the server key). | ||||||
| 272 | */ | ||||||
| 273 | |||||||
| 274 | /*ARGSUSED*/ | ||||||
| 275 | static void | ||||||
| 276 | sighup_handler(int sig) | ||||||
| 277 | { | ||||||
| 278 | received_sighup = 1; | ||||||
| 279 | } | ||||||
| 280 | |||||||
| 281 | /* | ||||||
| 282 | * Called from the main program after receiving SIGHUP. | ||||||
| 283 | * Restarts the server. | ||||||
| 284 | */ | ||||||
| 285 | static void | ||||||
| 286 | sighup_restart(void) | ||||||
| 287 | { | ||||||
| 288 | logit("Received SIGHUP; restarting.")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 288, 0 , SYSLOG_LEVEL_INFO, ((void*)0), "Received SIGHUP; restarting." ); | ||||||
| 289 | if (options.pid_file != NULL((void*)0)) | ||||||
| 290 | unlink(options.pid_file); | ||||||
| 291 | close_listen_socks(); | ||||||
| 292 | close_startup_pipes(); | ||||||
| 293 | ssh_signal(SIGHUP1, SIG_IGN(void (*)(int))1); /* will be restored after exec */ | ||||||
| 294 | execv(saved_argv[0], saved_argv); | ||||||
| 295 | logit("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0],sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 296, 0 , SYSLOG_LEVEL_INFO, ((void*)0), "RESTART FAILED: av[0]='%.100s', error: %.100s." , saved_argv[0], strerror((*__errno()))) | ||||||
| 296 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 296, 0 , SYSLOG_LEVEL_INFO, ((void*)0), "RESTART FAILED: av[0]='%.100s', error: %.100s." , saved_argv[0], strerror((*__errno()))); | ||||||
| 297 | exit(1); | ||||||
| 298 | } | ||||||
| 299 | |||||||
| 300 | /* | ||||||
| 301 | * Generic signal handler for terminating signals in the master daemon. | ||||||
| 302 | */ | ||||||
| 303 | /*ARGSUSED*/ | ||||||
| 304 | static void | ||||||
| 305 | sigterm_handler(int sig) | ||||||
| 306 | { | ||||||
| 307 | received_sigterm = sig; | ||||||
| 308 | } | ||||||
| 309 | |||||||
| 310 | /* | ||||||
| 311 | * SIGCHLD handler. This is called whenever a child dies. This will then | ||||||
| 312 | * reap any zombies left by exited children. | ||||||
| 313 | */ | ||||||
| 314 | /*ARGSUSED*/ | ||||||
| 315 | static void | ||||||
| 316 | main_sigchld_handler(int sig) | ||||||
| 317 | { | ||||||
| 318 | int save_errno = errno(*__errno()); | ||||||
| 319 | pid_t pid; | ||||||
| 320 | int status; | ||||||
| 321 | |||||||
| 322 | while ((pid = waitpid(-1, &status, WNOHANG1)) > 0 || | ||||||
| 323 | (pid == -1 && errno(*__errno()) == EINTR4)) | ||||||
| 324 | ; | ||||||
| 325 | errno(*__errno()) = save_errno; | ||||||
| 326 | } | ||||||
| 327 | |||||||
| 328 | /* | ||||||
| 329 | * Signal handler for the alarm after the login grace period has expired. | ||||||
| 330 | */ | ||||||
| 331 | /*ARGSUSED*/ | ||||||
| 332 | static void | ||||||
| 333 | grace_alarm_handler(int sig) | ||||||
| 334 | { | ||||||
| 335 | if (use_privsep && pmonitor != NULL((void*)0) && pmonitor->m_pid > 0) | ||||||
| 336 | kill(pmonitor->m_pid, SIGALRM14); | ||||||
| 337 | |||||||
| 338 | /* | ||||||
| 339 | * Try to kill any processes that we have spawned, E.g. authorized | ||||||
| 340 | * keys command helpers. | ||||||
| 341 | */ | ||||||
| 342 | if (getpgid(0) == getpid()) { | ||||||
| 343 | ssh_signal(SIGTERM15, SIG_IGN(void (*)(int))1); | ||||||
| 344 | kill(0, SIGTERM15); | ||||||
| 345 | } | ||||||
| 346 | |||||||
| 347 | /* Log error and exit. */ | ||||||
| 348 | if (use_privsep && pmonitor != NULL((void*)0) && pmonitor->m_pid <= 0) | ||||||
| 349 | cleanup_exit(255); /* don't log in privsep child */ | ||||||
| 350 | else { | ||||||
| 351 | sigdie("Timeout before authentication for %s port %d",sshsigdie("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 353 , 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Timeout before authentication for %s port %d" , ssh_remote_ipaddr(the_active_state), ssh_remote_port(the_active_state )) | ||||||
| 352 | ssh_remote_ipaddr(the_active_state),sshsigdie("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 353 , 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Timeout before authentication for %s port %d" , ssh_remote_ipaddr(the_active_state), ssh_remote_port(the_active_state )) | ||||||
| 353 | ssh_remote_port(the_active_state))sshsigdie("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 353 , 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Timeout before authentication for %s port %d" , ssh_remote_ipaddr(the_active_state), ssh_remote_port(the_active_state )); | ||||||
| 354 | } | ||||||
| 355 | } | ||||||
| 356 | |||||||
| 357 | /* Destroy the host and server keys. They will no longer be needed. */ | ||||||
| 358 | void | ||||||
| 359 | destroy_sensitive_data(void) | ||||||
| 360 | { | ||||||
| 361 | u_int i; | ||||||
| 362 | |||||||
| 363 | for (i = 0; i < options.num_host_key_files; i++) { | ||||||
| 364 | if (sensitive_data.host_keys[i]) { | ||||||
| 365 | sshkey_free(sensitive_data.host_keys[i]); | ||||||
| 366 | sensitive_data.host_keys[i] = NULL((void*)0); | ||||||
| 367 | } | ||||||
| 368 | if (sensitive_data.host_certificates[i]) { | ||||||
| 369 | sshkey_free(sensitive_data.host_certificates[i]); | ||||||
| 370 | sensitive_data.host_certificates[i] = NULL((void*)0); | ||||||
| 371 | } | ||||||
| 372 | } | ||||||
| 373 | } | ||||||
| 374 | |||||||
| 375 | /* Demote private to public keys for network child */ | ||||||
| 376 | void | ||||||
| 377 | demote_sensitive_data(void) | ||||||
| 378 | { | ||||||
| 379 | struct sshkey *tmp; | ||||||
| 380 | u_int i; | ||||||
| 381 | int r; | ||||||
| 382 | |||||||
| 383 | for (i = 0; i < options.num_host_key_files; i++) { | ||||||
| 384 | if (sensitive_data.host_keys[i]) { | ||||||
| 385 | if ((r = sshkey_from_private( | ||||||
| 386 | sensitive_data.host_keys[i], &tmp)) != 0) | ||||||
| 387 | fatal_r(r, "could not demote host %s key",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 388 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "could not demote host %s key" , sshkey_type(sensitive_data.host_keys[i])) | ||||||
| 388 | sshkey_type(sensitive_data.host_keys[i]))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 388 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "could not demote host %s key" , sshkey_type(sensitive_data.host_keys[i])); | ||||||
| 389 | sshkey_free(sensitive_data.host_keys[i]); | ||||||
| 390 | sensitive_data.host_keys[i] = tmp; | ||||||
| 391 | } | ||||||
| 392 | /* Certs do not need demotion */ | ||||||
| 393 | } | ||||||
| 394 | } | ||||||
| 395 | |||||||
| 396 | static void | ||||||
| 397 | privsep_preauth_child(void) | ||||||
| 398 | { | ||||||
| 399 | gid_t gidset[1]; | ||||||
| 400 | struct passwd *pw; | ||||||
| 401 | |||||||
| 402 | /* Enable challenge-response authentication for privilege separation */ | ||||||
| 403 | privsep_challenge_enable(); | ||||||
| 404 | |||||||
| 405 | #ifdef GSSAPI | ||||||
| 406 | /* Cache supported mechanism OIDs for later use */ | ||||||
| 407 | ssh_gssapi_prepare_supported_oids(); | ||||||
| 408 | #endif | ||||||
| 409 | |||||||
| 410 | /* Demote the private keys to public keys. */ | ||||||
| 411 | demote_sensitive_data(); | ||||||
| 412 | |||||||
| 413 | /* Demote the child */ | ||||||
| 414 | if (getuid() == 0 || geteuid() == 0) { | ||||||
| 415 | if ((pw = getpwnam(SSH_PRIVSEP_USER"sshd")) == NULL((void*)0)) | ||||||
| 416 | fatal("Privilege separation user %s does not exist",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 417 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Privilege separation user %s does not exist" , "sshd") | ||||||
| 417 | SSH_PRIVSEP_USER)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 417 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Privilege separation user %s does not exist" , "sshd"); | ||||||
| 418 | pw = pwcopy(pw); /* Ensure mutable */ | ||||||
| 419 | endpwent(); | ||||||
| 420 | freezero(pw->pw_passwd, strlen(pw->pw_passwd)); | ||||||
| 421 | |||||||
| 422 | /* Change our root directory */ | ||||||
| 423 | if (chroot(_PATH_PRIVSEP_CHROOT_DIR"/var/empty") == -1) | ||||||
| 424 | fatal("chroot(\"%s\"): %s", _PATH_PRIVSEP_CHROOT_DIR,sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 425 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "chroot(\"%s\"): %s", "/var/empty" , strerror((*__errno()))) | ||||||
| 425 | strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 425 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "chroot(\"%s\"): %s", "/var/empty" , strerror((*__errno()))); | ||||||
| 426 | if (chdir("/") == -1) | ||||||
| 427 | fatal("chdir(\"/\"): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 427 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "chdir(\"/\"): %s", strerror ((*__errno()))); | ||||||
| 428 | |||||||
| 429 | /* | ||||||
| 430 | * Drop our privileges | ||||||
| 431 | * NB. Can't use setusercontext() after chroot. | ||||||
| 432 | */ | ||||||
| 433 | debug3("privsep user:group %u:%u", (u_int)pw->pw_uid,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 434, 0 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "privsep user:group %u:%u" , (u_int)pw->pw_uid, (u_int)pw->pw_gid) | ||||||
| 434 | (u_int)pw->pw_gid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 434, 0 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "privsep user:group %u:%u" , (u_int)pw->pw_uid, (u_int)pw->pw_gid); | ||||||
| 435 | gidset[0] = pw->pw_gid; | ||||||
| 436 | if (setgroups(1, gidset) == -1) | ||||||
| 437 | fatal("setgroups: %.100s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 437 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "setgroups: %.100s", strerror ((*__errno()))); | ||||||
| 438 | permanently_set_uid(pw); | ||||||
| 439 | } | ||||||
| 440 | } | ||||||
| 441 | |||||||
| 442 | static int | ||||||
| 443 | privsep_preauth(struct ssh *ssh) | ||||||
| 444 | { | ||||||
| 445 | int status, r; | ||||||
| 446 | pid_t pid; | ||||||
| 447 | struct ssh_sandbox *box = NULL((void*)0); | ||||||
| 448 | |||||||
| 449 | /* Set up unprivileged child process to deal with network data */ | ||||||
| 450 | pmonitor = monitor_init(); | ||||||
| 451 | /* Store a pointer to the kex for later rekeying */ | ||||||
| 452 | pmonitor->m_pkex = &ssh->kex; | ||||||
| 453 | |||||||
| 454 | if (use_privsep == PRIVSEP_ON1) | ||||||
| 455 | box = ssh_sandbox_init(); | ||||||
| 456 | pid = fork(); | ||||||
| 457 | if (pid == -1) { | ||||||
| 458 | fatal("fork of unprivileged child failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 458 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "fork of unprivileged child failed" ); | ||||||
| 459 | } else if (pid != 0) { | ||||||
| 460 | debug2("Network child is on pid %ld", (long)pid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 460, 0 , SYSLOG_LEVEL_DEBUG2, ((void*)0), "Network child is on pid %ld" , (long)pid); | ||||||
| 461 | |||||||
| 462 | pmonitor->m_pid = pid; | ||||||
| 463 | if (have_agent) { | ||||||
| 464 | r = ssh_get_authentication_socket(&auth_sock); | ||||||
| 465 | if (r != 0) { | ||||||
| 466 | error_r(r, "Could not get agent socket")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 466, 0 , SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not get agent socket" ); | ||||||
| 467 | have_agent = 0; | ||||||
| 468 | } | ||||||
| 469 | } | ||||||
| 470 | if (box != NULL((void*)0)) | ||||||
| 471 | ssh_sandbox_parent_preauth(box, pid); | ||||||
| 472 | monitor_child_preauth(ssh, pmonitor); | ||||||
| 473 | |||||||
| 474 | /* Wait for the child's exit status */ | ||||||
| 475 | while (waitpid(pid, &status, 0) == -1) { | ||||||
| 476 | if (errno(*__errno()) == EINTR4) | ||||||
| 477 | continue; | ||||||
| 478 | pmonitor->m_pid = -1; | ||||||
| 479 | fatal_f("waitpid: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 479 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "waitpid: %s", strerror( (*__errno()))); | ||||||
| 480 | } | ||||||
| 481 | privsep_is_preauth = 0; | ||||||
| 482 | pmonitor->m_pid = -1; | ||||||
| 483 | if (WIFEXITED(status)(((status) & 0177) == 0)) { | ||||||
| 484 | if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) != 0) | ||||||
| 485 | fatal_f("preauth child exited with status %d",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 486 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "preauth child exited with status %d" , (int)(((unsigned)(status) >> 8) & 0xff)) | ||||||
| 486 | WEXITSTATUS(status))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 486 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "preauth child exited with status %d" , (int)(((unsigned)(status) >> 8) & 0xff)); | ||||||
| 487 | } else if (WIFSIGNALED(status)(((status) & 0177) != 0177 && ((status) & 0177 ) != 0)) | ||||||
| 488 | fatal_f("preauth child terminated by signal %d",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 489 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "preauth child terminated by signal %d" , (((status) & 0177))) | ||||||
| 489 | WTERMSIG(status))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 489 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "preauth child terminated by signal %d" , (((status) & 0177))); | ||||||
| 490 | if (box != NULL((void*)0)) | ||||||
| 491 | ssh_sandbox_parent_finish(box); | ||||||
| 492 | return 1; | ||||||
| 493 | } else { | ||||||
| 494 | /* child */ | ||||||
| 495 | close(pmonitor->m_sendfd); | ||||||
| 496 | close(pmonitor->m_log_recvfd); | ||||||
| 497 | |||||||
| 498 | /* Arrange for logging to be sent to the monitor */ | ||||||
| 499 | set_log_handler(mm_log_handler, pmonitor); | ||||||
| 500 | |||||||
| 501 | privsep_preauth_child(); | ||||||
| 502 | setproctitle("%s", "[net]"); | ||||||
| 503 | if (box != NULL((void*)0)) | ||||||
| 504 | ssh_sandbox_child(box); | ||||||
| 505 | |||||||
| 506 | return 0; | ||||||
| 507 | } | ||||||
| 508 | } | ||||||
| 509 | |||||||
| 510 | static void | ||||||
| 511 | privsep_postauth(struct ssh *ssh, Authctxt *authctxt) | ||||||
| 512 | { | ||||||
| 513 | if (authctxt->pw->pw_uid == 0) { | ||||||
| 514 | /* File descriptor passing is broken or root login */ | ||||||
| 515 | use_privsep = 0; | ||||||
| 516 | goto skip; | ||||||
| 517 | } | ||||||
| 518 | |||||||
| 519 | /* New socket pair */ | ||||||
| 520 | monitor_reinit(pmonitor); | ||||||
| 521 | |||||||
| 522 | pmonitor->m_pid = fork(); | ||||||
| |||||||
| 523 | if (pmonitor->m_pid == -1) | ||||||
| 524 | fatal("fork of unprivileged child failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 524 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "fork of unprivileged child failed" ); | ||||||
| 525 | else if (pmonitor->m_pid != 0) { | ||||||
| 526 | verbose("User child is on pid %ld", (long)pmonitor->m_pid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 526, 0 , SYSLOG_LEVEL_VERBOSE, ((void*)0), "User child is on pid %ld" , (long)pmonitor->m_pid); | ||||||
| 527 | sshbuf_reset(loginmsg); | ||||||
| 528 | monitor_clear_keystate(ssh, pmonitor); | ||||||
| 529 | monitor_child_postauth(ssh, pmonitor); | ||||||
| 530 | |||||||
| 531 | /* NEVERREACHED */ | ||||||
| 532 | exit(0); | ||||||
| 533 | } | ||||||
| 534 | |||||||
| 535 | /* child */ | ||||||
| 536 | |||||||
| 537 | close(pmonitor->m_sendfd); | ||||||
| 538 | pmonitor->m_sendfd = -1; | ||||||
| 539 | |||||||
| 540 | /* Demote the private keys to public keys. */ | ||||||
| 541 | demote_sensitive_data(); | ||||||
| 542 | |||||||
| 543 | /* Drop privileges */ | ||||||
| 544 | do_setusercontext(authctxt->pw); | ||||||
| 545 | |||||||
| 546 | skip: | ||||||
| 547 | /* It is safe now to apply the key state */ | ||||||
| 548 | monitor_apply_keystate(ssh, pmonitor); | ||||||
| 549 | |||||||
| 550 | /* | ||||||
| 551 | * Tell the packet layer that authentication was successful, since | ||||||
| 552 | * this information is not part of the key state. | ||||||
| 553 | */ | ||||||
| 554 | ssh_packet_set_authenticated(ssh); | ||||||
| 555 | } | ||||||
| 556 | |||||||
| 557 | static void | ||||||
| 558 | append_hostkey_type(struct sshbuf *b, const char *s) | ||||||
| 559 | { | ||||||
| 560 | int r; | ||||||
| 561 | |||||||
| 562 | if (match_pattern_list(s, options.hostkeyalgorithms, 0) != 1) { | ||||||
| 563 | debug3_f("%s key not permitted by HostkeyAlgorithms", s)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 563, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s key not permitted by HostkeyAlgorithms" , s); | ||||||
| 564 | return; | ||||||
| 565 | } | ||||||
| 566 | if ((r = sshbuf_putf(b, "%s%s", sshbuf_len(b) > 0 ? "," : "", s)) != 0) | ||||||
| 567 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 567 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); | ||||||
| 568 | } | ||||||
| 569 | |||||||
| 570 | static char * | ||||||
| 571 | list_hostkey_types(void) | ||||||
| 572 | { | ||||||
| 573 | struct sshbuf *b; | ||||||
| 574 | struct sshkey *key; | ||||||
| 575 | char *ret; | ||||||
| 576 | u_int i; | ||||||
| 577 | |||||||
| 578 | if ((b = sshbuf_new()) == NULL((void*)0)) | ||||||
| 579 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 579 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed"); | ||||||
| 580 | for (i = 0; i < options.num_host_key_files; i++) { | ||||||
| 581 | key = sensitive_data.host_keys[i]; | ||||||
| 582 | if (key == NULL((void*)0)) | ||||||
| 583 | key = sensitive_data.host_pubkeys[i]; | ||||||
| 584 | if (key == NULL((void*)0)) | ||||||
| 585 | continue; | ||||||
| 586 | switch (key->type) { | ||||||
| 587 | case KEY_RSA: | ||||||
| 588 | /* for RSA we also support SHA2 signatures */ | ||||||
| 589 | append_hostkey_type(b, "rsa-sha2-512"); | ||||||
| 590 | append_hostkey_type(b, "rsa-sha2-256"); | ||||||
| 591 | /* FALLTHROUGH */ | ||||||
| 592 | case KEY_DSA: | ||||||
| 593 | case KEY_ECDSA: | ||||||
| 594 | case KEY_ED25519: | ||||||
| 595 | case KEY_ECDSA_SK: | ||||||
| 596 | case KEY_ED25519_SK: | ||||||
| 597 | case KEY_XMSS: | ||||||
| 598 | append_hostkey_type(b, sshkey_ssh_name(key)); | ||||||
| 599 | break; | ||||||
| 600 | } | ||||||
| 601 | /* If the private key has a cert peer, then list that too */ | ||||||
| 602 | key = sensitive_data.host_certificates[i]; | ||||||
| 603 | if (key == NULL((void*)0)) | ||||||
| 604 | continue; | ||||||
| 605 | switch (key->type) { | ||||||
| 606 | case KEY_RSA_CERT: | ||||||
| 607 | /* for RSA we also support SHA2 signatures */ | ||||||
| 608 | append_hostkey_type(b, | ||||||
| 609 | "rsa-sha2-512-cert-v01@openssh.com"); | ||||||
| 610 | append_hostkey_type(b, | ||||||
| 611 | "rsa-sha2-256-cert-v01@openssh.com"); | ||||||
| 612 | /* FALLTHROUGH */ | ||||||
| 613 | case KEY_DSA_CERT: | ||||||
| 614 | case KEY_ECDSA_CERT: | ||||||
| 615 | case KEY_ED25519_CERT: | ||||||
| 616 | case KEY_ECDSA_SK_CERT: | ||||||
| 617 | case KEY_ED25519_SK_CERT: | ||||||
| 618 | case KEY_XMSS_CERT: | ||||||
| 619 | append_hostkey_type(b, sshkey_ssh_name(key)); | ||||||
| 620 | break; | ||||||
| 621 | } | ||||||
| 622 | } | ||||||
| 623 | if ((ret = sshbuf_dup_string(b)) == NULL((void*)0)) | ||||||
| 624 | fatal_f("sshbuf_dup_string failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 624 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_dup_string failed" ); | ||||||
| 625 | sshbuf_free(b); | ||||||
| 626 | debug_f("%s", ret)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 626, 1 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "%s", ret); | ||||||
| 627 | return ret; | ||||||
| 628 | } | ||||||
| 629 | |||||||
| 630 | static struct sshkey * | ||||||
| 631 | get_hostkey_by_type(int type, int nid, int need_private, struct ssh *ssh) | ||||||
| 632 | { | ||||||
| 633 | u_int i; | ||||||
| 634 | struct sshkey *key; | ||||||
| 635 | |||||||
| 636 | for (i = 0; i < options.num_host_key_files; i++) { | ||||||
| 637 | switch (type) { | ||||||
| 638 | case KEY_RSA_CERT: | ||||||
| 639 | case KEY_DSA_CERT: | ||||||
| 640 | case KEY_ECDSA_CERT: | ||||||
| 641 | case KEY_ED25519_CERT: | ||||||
| 642 | case KEY_ECDSA_SK_CERT: | ||||||
| 643 | case KEY_ED25519_SK_CERT: | ||||||
| 644 | case KEY_XMSS_CERT: | ||||||
| 645 | key = sensitive_data.host_certificates[i]; | ||||||
| 646 | break; | ||||||
| 647 | default: | ||||||
| 648 | key = sensitive_data.host_keys[i]; | ||||||
| 649 | if (key == NULL((void*)0) && !need_private) | ||||||
| 650 | key = sensitive_data.host_pubkeys[i]; | ||||||
| 651 | break; | ||||||
| 652 | } | ||||||
| 653 | if (key == NULL((void*)0) || key->type != type) | ||||||
| 654 | continue; | ||||||
| 655 | switch (type) { | ||||||
| 656 | case KEY_ECDSA: | ||||||
| 657 | case KEY_ECDSA_SK: | ||||||
| 658 | case KEY_ECDSA_CERT: | ||||||
| 659 | case KEY_ECDSA_SK_CERT: | ||||||
| 660 | if (key->ecdsa_nid != nid) | ||||||
| 661 | continue; | ||||||
| 662 | /* FALLTHROUGH */ | ||||||
| 663 | default: | ||||||
| 664 | return need_private ? | ||||||
| 665 | sensitive_data.host_keys[i] : key; | ||||||
| 666 | } | ||||||
| 667 | } | ||||||
| 668 | return NULL((void*)0); | ||||||
| 669 | } | ||||||
| 670 | |||||||
| 671 | struct sshkey * | ||||||
| 672 | get_hostkey_public_by_type(int type, int nid, struct ssh *ssh) | ||||||
| 673 | { | ||||||
| 674 | return get_hostkey_by_type(type, nid, 0, ssh); | ||||||
| 675 | } | ||||||
| 676 | |||||||
| 677 | struct sshkey * | ||||||
| 678 | get_hostkey_private_by_type(int type, int nid, struct ssh *ssh) | ||||||
| 679 | { | ||||||
| 680 | return get_hostkey_by_type(type, nid, 1, ssh); | ||||||
| 681 | } | ||||||
| 682 | |||||||
| 683 | struct sshkey * | ||||||
| 684 | get_hostkey_by_index(int ind) | ||||||
| 685 | { | ||||||
| 686 | if (ind < 0 || (u_int)ind >= options.num_host_key_files) | ||||||
| 687 | return (NULL((void*)0)); | ||||||
| 688 | return (sensitive_data.host_keys[ind]); | ||||||
| 689 | } | ||||||
| 690 | |||||||
| 691 | struct sshkey * | ||||||
| 692 | get_hostkey_public_by_index(int ind, struct ssh *ssh) | ||||||
| 693 | { | ||||||
| 694 | if (ind < 0 || (u_int)ind >= options.num_host_key_files) | ||||||
| 695 | return (NULL((void*)0)); | ||||||
| 696 | return (sensitive_data.host_pubkeys[ind]); | ||||||
| 697 | } | ||||||
| 698 | |||||||
| 699 | int | ||||||
| 700 | get_hostkey_index(struct sshkey *key, int compare, struct ssh *ssh) | ||||||
| 701 | { | ||||||
| 702 | u_int i; | ||||||
| 703 | |||||||
| 704 | for (i = 0; i < options.num_host_key_files; i++) { | ||||||
| 705 | if (sshkey_is_cert(key)) { | ||||||
| 706 | if (key == sensitive_data.host_certificates[i] || | ||||||
| 707 | (compare && sensitive_data.host_certificates[i] && | ||||||
| 708 | sshkey_equal(key, | ||||||
| 709 | sensitive_data.host_certificates[i]))) | ||||||
| 710 | return (i); | ||||||
| 711 | } else { | ||||||
| 712 | if (key == sensitive_data.host_keys[i] || | ||||||
| 713 | (compare && sensitive_data.host_keys[i] && | ||||||
| 714 | sshkey_equal(key, sensitive_data.host_keys[i]))) | ||||||
| 715 | return (i); | ||||||
| 716 | if (key == sensitive_data.host_pubkeys[i] || | ||||||
| 717 | (compare && sensitive_data.host_pubkeys[i] && | ||||||
| 718 | sshkey_equal(key, sensitive_data.host_pubkeys[i]))) | ||||||
| 719 | return (i); | ||||||
| 720 | } | ||||||
| 721 | } | ||||||
| 722 | return (-1); | ||||||
| 723 | } | ||||||
| 724 | |||||||
| 725 | /* Inform the client of all hostkeys */ | ||||||
| 726 | static void | ||||||
| 727 | notify_hostkeys(struct ssh *ssh) | ||||||
| 728 | { | ||||||
| 729 | struct sshbuf *buf; | ||||||
| 730 | struct sshkey *key; | ||||||
| 731 | u_int i, nkeys; | ||||||
| 732 | int r; | ||||||
| 733 | char *fp; | ||||||
| 734 | |||||||
| 735 | /* Some clients cannot cope with the hostkeys message, skip those. */ | ||||||
| 736 | if (ssh->compat & SSH_BUG_HOSTKEYS0x20000000) | ||||||
| 737 | return; | ||||||
| 738 | |||||||
| 739 | if ((buf = sshbuf_new()) == NULL((void*)0)) | ||||||
| 740 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 740 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); | ||||||
| 741 | for (i = nkeys = 0; i < options.num_host_key_files; i++) { | ||||||
| 742 | key = get_hostkey_public_by_index(i, ssh); | ||||||
| 743 | if (key == NULL((void*)0) || key->type == KEY_UNSPEC || | ||||||
| 744 | sshkey_is_cert(key)) | ||||||
| 745 | continue; | ||||||
| 746 | fp = sshkey_fingerprint(key, options.fingerprint_hash, | ||||||
| 747 | SSH_FP_DEFAULT); | ||||||
| 748 | debug3_f("key %d: %s %s", i, sshkey_ssh_name(key), fp)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 748, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "key %d: %s %s", i, sshkey_ssh_name (key), fp); | ||||||
| 749 | free(fp); | ||||||
| 750 | if (nkeys == 0) { | ||||||
| 751 | /* | ||||||
| 752 | * Start building the request when we find the | ||||||
| 753 | * first usable key. | ||||||
| 754 | */ | ||||||
| 755 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST80)) != 0 || | ||||||
| 756 | (r = sshpkt_put_cstring(ssh, "hostkeys-00@openssh.com")) != 0 || | ||||||
| 757 | (r = sshpkt_put_u8(ssh, 0)) != 0) /* want reply */ | ||||||
| 758 | sshpkt_fatal(ssh, r, "%s: start request", __func__); | ||||||
| 759 | } | ||||||
| 760 | /* Append the key to the request */ | ||||||
| 761 | sshbuf_reset(buf); | ||||||
| 762 | if ((r = sshkey_putb(key, buf)) != 0) | ||||||
| 763 | fatal_fr(r, "couldn't put hostkey %d", i)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 763 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "couldn't put hostkey %d" , i); | ||||||
| 764 | if ((r = sshpkt_put_stringb(ssh, buf)) != 0) | ||||||
| 765 | sshpkt_fatal(ssh, r, "%s: append key", __func__); | ||||||
| 766 | nkeys++; | ||||||
| 767 | } | ||||||
| 768 | debug3_f("sent %u hostkeys", nkeys)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 768, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "sent %u hostkeys", nkeys); | ||||||
| 769 | if (nkeys == 0) | ||||||
| 770 | fatal_f("no hostkeys")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 770 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "no hostkeys"); | ||||||
| 771 | if ((r = sshpkt_send(ssh)) != 0) | ||||||
| 772 | sshpkt_fatal(ssh, r, "%s: send", __func__); | ||||||
| 773 | sshbuf_free(buf); | ||||||
| 774 | } | ||||||
| 775 | |||||||
| 776 | /* | ||||||
| 777 | * returns 1 if connection should be dropped, 0 otherwise. | ||||||
| 778 | * dropping starts at connection #max_startups_begin with a probability | ||||||
| 779 | * of (max_startups_rate/100). the probability increases linearly until | ||||||
| 780 | * all connections are dropped for startups > max_startups | ||||||
| 781 | */ | ||||||
| 782 | static int | ||||||
| 783 | should_drop_connection(int startups) | ||||||
| 784 | { | ||||||
| 785 | int p, r; | ||||||
| 786 | |||||||
| 787 | if (startups < options.max_startups_begin) | ||||||
| 788 | return 0; | ||||||
| 789 | if (startups >= options.max_startups) | ||||||
| 790 | return 1; | ||||||
| 791 | if (options.max_startups_rate == 100) | ||||||
| 792 | return 1; | ||||||
| 793 | |||||||
| 794 | p = 100 - options.max_startups_rate; | ||||||
| 795 | p *= startups - options.max_startups_begin; | ||||||
| 796 | p /= options.max_startups - options.max_startups_begin; | ||||||
| 797 | p += options.max_startups_rate; | ||||||
| 798 | r = arc4random_uniform(100); | ||||||
| 799 | |||||||
| 800 | debug_f("p %d, r %d", p, r)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 800, 1 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "p %d, r %d", p, r); | ||||||
| 801 | return (r < p) ? 1 : 0; | ||||||
| 802 | } | ||||||
| 803 | |||||||
| 804 | /* | ||||||
| 805 | * Check whether connection should be accepted by MaxStartups. | ||||||
| 806 | * Returns 0 if the connection is accepted. If the connection is refused, | ||||||
| 807 | * returns 1 and attempts to send notification to client. | ||||||
| 808 | * Logs when the MaxStartups condition is entered or exited, and periodically | ||||||
| 809 | * while in that state. | ||||||
| 810 | */ | ||||||
| 811 | static int | ||||||
| 812 | drop_connection(int sock, int startups, int notify_pipe) | ||||||
| 813 | { | ||||||
| 814 | char *laddr, *raddr; | ||||||
| 815 | const char msg[] = "Exceeded MaxStartups\r\n"; | ||||||
| 816 | static time_t last_drop, first_drop; | ||||||
| 817 | static u_int ndropped; | ||||||
| 818 | LogLevel drop_level = SYSLOG_LEVEL_VERBOSE; | ||||||
| 819 | time_t now; | ||||||
| 820 | |||||||
| 821 | now = monotime(); | ||||||
| 822 | if (!should_drop_connection(startups) && | ||||||
| 823 | srclimit_check_allow(sock, notify_pipe) == 1) { | ||||||
| 824 | if (last_drop != 0 && | ||||||
| 825 | startups < options.max_startups_begin - 1) { | ||||||
| 826 | /* XXX maybe need better hysteresis here */ | ||||||
| 827 | logit("exited MaxStartups throttling after %s, "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 829, 0 , SYSLOG_LEVEL_INFO, ((void*)0), "exited MaxStartups throttling after %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped ) | ||||||
| 828 | "%u connections dropped",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 829, 0 , SYSLOG_LEVEL_INFO, ((void*)0), "exited MaxStartups throttling after %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped ) | ||||||
| 829 | fmt_timeframe(now - first_drop), ndropped)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 829, 0 , SYSLOG_LEVEL_INFO, ((void*)0), "exited MaxStartups throttling after %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped ); | ||||||
| 830 | last_drop = 0; | ||||||
| 831 | } | ||||||
| 832 | return 0; | ||||||
| 833 | } | ||||||
| 834 | |||||||
| 835 | #define SSHD_MAXSTARTUPS_LOG_INTERVAL(5 * 60) (5 * 60) | ||||||
| 836 | if (last_drop == 0) { | ||||||
| 837 | error("beginning MaxStartups throttling")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 837, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "beginning MaxStartups throttling" ); | ||||||
| 838 | drop_level = SYSLOG_LEVEL_INFO; | ||||||
| 839 | first_drop = now; | ||||||
| 840 | ndropped = 0; | ||||||
| 841 | } else if (last_drop + SSHD_MAXSTARTUPS_LOG_INTERVAL(5 * 60) < now) { | ||||||
| 842 | /* Periodic logs */ | ||||||
| 843 | error("in MaxStartups throttling for %s, "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 845, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "in MaxStartups throttling for %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped + 1) | ||||||
| 844 | "%u connections dropped",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 845, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "in MaxStartups throttling for %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped + 1) | ||||||
| 845 | fmt_timeframe(now - first_drop), ndropped + 1)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 845, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "in MaxStartups throttling for %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped + 1); | ||||||
| 846 | drop_level = SYSLOG_LEVEL_INFO; | ||||||
| 847 | } | ||||||
| 848 | last_drop = now; | ||||||
| 849 | ndropped++; | ||||||
| 850 | |||||||
| 851 | laddr = get_local_ipaddr(sock); | ||||||
| 852 | raddr = get_peer_ipaddr(sock); | ||||||
| 853 | do_log2(drop_level, "drop connection #%d from [%s]:%d on [%s]:%d "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 855, 0 , drop_level, ((void*)0), "drop connection #%d from [%s]:%d on [%s]:%d " "past MaxStartups", startups, raddr, get_peer_port(sock), laddr , get_local_port(sock)) | ||||||
| 854 | "past MaxStartups", startups, raddr, get_peer_port(sock),sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 855, 0 , drop_level, ((void*)0), "drop connection #%d from [%s]:%d on [%s]:%d " "past MaxStartups", startups, raddr, get_peer_port(sock), laddr , get_local_port(sock)) | ||||||
| 855 | laddr, get_local_port(sock))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 855, 0 , drop_level, ((void*)0), "drop connection #%d from [%s]:%d on [%s]:%d " "past MaxStartups", startups, raddr, get_peer_port(sock), laddr , get_local_port(sock)); | ||||||
| 856 | free(laddr); | ||||||
| 857 | free(raddr); | ||||||
| 858 | /* best-effort notification to client */ | ||||||
| 859 | (void)write(sock, msg, sizeof(msg) - 1); | ||||||
| 860 | return 1; | ||||||
| 861 | } | ||||||
| 862 | |||||||
| 863 | static void | ||||||
| 864 | usage(void) | ||||||
| 865 | { | ||||||
| 866 | fprintf(stderr(&__sF[2]), "%s, %s\n", SSH_VERSION"OpenSSH_8.8", SSH_OPENSSL_VERSIONOpenSSL_version(0)); | ||||||
| 867 | fprintf(stderr(&__sF[2]), | ||||||
| 868 | "usage: sshd [-46DdeiqTt] [-C connection_spec] [-c host_cert_file]\n" | ||||||
| 869 | " [-E log_file] [-f config_file] [-g login_grace_time]\n" | ||||||
| 870 | " [-h host_key_file] [-o option] [-p port] [-u len]\n" | ||||||
| 871 | ); | ||||||
| 872 | exit(1); | ||||||
| 873 | } | ||||||
| 874 | |||||||
| 875 | static void | ||||||
| 876 | send_rexec_state(int fd, struct sshbuf *conf) | ||||||
| 877 | { | ||||||
| 878 | struct sshbuf *m = NULL((void*)0), *inc = NULL((void*)0); | ||||||
| 879 | struct include_item *item = NULL((void*)0); | ||||||
| 880 | int r; | ||||||
| 881 | |||||||
| 882 | debug3_f("entering fd = %d config len %zu", fd,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 883, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering fd = %d config len %zu" , fd, sshbuf_len(conf)) | ||||||
| 883 | sshbuf_len(conf))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 883, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering fd = %d config len %zu" , fd, sshbuf_len(conf)); | ||||||
| 884 | |||||||
| 885 | if ((m = sshbuf_new()) == NULL((void*)0) || (inc = sshbuf_new()) == NULL((void*)0)) | ||||||
| 886 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 886 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed"); | ||||||
| 887 | |||||||
| 888 | /* pack includes into a string */ | ||||||
| 889 | TAILQ_FOREACH(item, &includes, entry)for((item) = ((&includes)->tqh_first); (item) != ((void *)0); (item) = ((item)->entry.tqe_next)) { | ||||||
| 890 | if ((r = sshbuf_put_cstring(inc, item->selector)) != 0 || | ||||||
| 891 | (r = sshbuf_put_cstring(inc, item->filename)) != 0 || | ||||||
| 892 | (r = sshbuf_put_stringb(inc, item->contents)) != 0) | ||||||
| 893 | fatal_fr(r, "compose includes")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 893 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose includes"); | ||||||
| 894 | } | ||||||
| 895 | |||||||
| 896 | /* | ||||||
| 897 | * Protocol from reexec master to child: | ||||||
| 898 | * string configuration | ||||||
| 899 | * string included_files[] { | ||||||
| 900 | * string selector | ||||||
| 901 | * string filename | ||||||
| 902 | * string contents | ||||||
| 903 | * } | ||||||
| 904 | */ | ||||||
| 905 | if ((r = sshbuf_put_stringb(m, conf)) != 0 || | ||||||
| 906 | (r = sshbuf_put_stringb(m, inc)) != 0) | ||||||
| 907 | fatal_fr(r, "compose config")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 907 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose config"); | ||||||
| 908 | if (ssh_msg_send(fd, 0, m) == -1) | ||||||
| 909 | error_f("ssh_msg_send failed")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 909, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "ssh_msg_send failed"); | ||||||
| 910 | |||||||
| 911 | sshbuf_free(m); | ||||||
| 912 | sshbuf_free(inc); | ||||||
| 913 | |||||||
| 914 | debug3_f("done")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 914, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "done"); | ||||||
| 915 | } | ||||||
| 916 | |||||||
| 917 | static void | ||||||
| 918 | recv_rexec_state(int fd, struct sshbuf *conf) | ||||||
| 919 | { | ||||||
| 920 | struct sshbuf *m, *inc; | ||||||
| 921 | u_char *cp, ver; | ||||||
| 922 | size_t len; | ||||||
| 923 | int r; | ||||||
| 924 | struct include_item *item; | ||||||
| 925 | |||||||
| 926 | debug3_f("entering fd = %d", fd)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 926, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering fd = %d", fd); | ||||||
| 927 | |||||||
| 928 | if ((m = sshbuf_new()) == NULL((void*)0) || (inc = sshbuf_new()) == NULL((void*)0)) | ||||||
| 929 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 929 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed"); | ||||||
| 930 | if (ssh_msg_recv(fd, m) == -1) | ||||||
| 931 | fatal_f("ssh_msg_recv failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 931 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "ssh_msg_recv failed"); | ||||||
| 932 | if ((r = sshbuf_get_u8(m, &ver)) != 0) | ||||||
| 933 | fatal_fr(r, "parse version")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 933 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse version"); | ||||||
| 934 | if (ver != 0) | ||||||
| 935 | fatal_f("rexec version mismatch")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 935 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "rexec version mismatch" ); | ||||||
| 936 | if ((r = sshbuf_get_string(m, &cp, &len)) != 0 || | ||||||
| 937 | (r = sshbuf_get_stringb(m, inc)) != 0) | ||||||
| 938 | fatal_fr(r, "parse config")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 938 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse config"); | ||||||
| 939 | |||||||
| 940 | if (conf != NULL((void*)0) && (r = sshbuf_put(conf, cp, len))) | ||||||
| 941 | fatal_fr(r, "sshbuf_put")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 941 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put"); | ||||||
| 942 | |||||||
| 943 | while (sshbuf_len(inc) != 0) { | ||||||
| 944 | item = xcalloc(1, sizeof(*item)); | ||||||
| 945 | if ((item->contents = sshbuf_new()) == NULL((void*)0)) | ||||||
| 946 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 946 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed"); | ||||||
| 947 | if ((r = sshbuf_get_cstring(inc, &item->selector, NULL((void*)0))) != 0 || | ||||||
| 948 | (r = sshbuf_get_cstring(inc, &item->filename, NULL((void*)0))) != 0 || | ||||||
| 949 | (r = sshbuf_get_stringb(inc, item->contents)) != 0) | ||||||
| 950 | fatal_fr(r, "parse includes")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 950 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse includes"); | ||||||
| 951 | TAILQ_INSERT_TAIL(&includes, item, entry)do { (item)->entry.tqe_next = ((void*)0); (item)->entry .tqe_prev = (&includes)->tqh_last; *(&includes)-> tqh_last = (item); (&includes)->tqh_last = &(item) ->entry.tqe_next; } while (0); | ||||||
| 952 | } | ||||||
| 953 | |||||||
| 954 | free(cp); | ||||||
| 955 | sshbuf_free(m); | ||||||
| 956 | |||||||
| 957 | debug3_f("done")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 957, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "done"); | ||||||
| 958 | } | ||||||
| 959 | |||||||
| 960 | /* Accept a connection from inetd */ | ||||||
| 961 | static void | ||||||
| 962 | server_accept_inetd(int *sock_in, int *sock_out) | ||||||
| 963 | { | ||||||
| 964 | if (rexeced_flag) { | ||||||
| 965 | close(REEXEC_CONFIG_PASS_FD(2 + 3)); | ||||||
| 966 | *sock_in = *sock_out = dup(STDIN_FILENO0); | ||||||
| 967 | } else { | ||||||
| 968 | *sock_in = dup(STDIN_FILENO0); | ||||||
| 969 | *sock_out = dup(STDOUT_FILENO1); | ||||||
| 970 | } | ||||||
| 971 | /* | ||||||
| 972 | * We intentionally do not close the descriptors 0, 1, and 2 | ||||||
| 973 | * as our code for setting the descriptors won't work if | ||||||
| 974 | * ttyfd happens to be one of those. | ||||||
| 975 | */ | ||||||
| 976 | if (stdfd_devnull(1, 1, !log_stderr) == -1) | ||||||
| 977 | error_f("stdfd_devnull failed")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 977, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "stdfd_devnull failed"); | ||||||
| 978 | debug("inetd sockets after dupping: %d, %d", *sock_in, *sock_out)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 978, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "inetd sockets after dupping: %d, %d" , *sock_in, *sock_out); | ||||||
| 979 | } | ||||||
| 980 | |||||||
| 981 | /* | ||||||
| 982 | * Listen for TCP connections | ||||||
| 983 | */ | ||||||
| 984 | static void | ||||||
| 985 | listen_on_addrs(struct listenaddr *la) | ||||||
| 986 | { | ||||||
| 987 | int ret, listen_sock; | ||||||
| 988 | struct addrinfo *ai; | ||||||
| 989 | char ntop[NI_MAXHOST256], strport[NI_MAXSERV32]; | ||||||
| 990 | |||||||
| 991 | for (ai = la->addrs; ai; ai = ai->ai_next) { | ||||||
| 992 | if (ai->ai_family != AF_INET2 && ai->ai_family != AF_INET624) | ||||||
| 993 | continue; | ||||||
| 994 | if (num_listen_socks >= MAX_LISTEN_SOCKS16) | ||||||
| 995 | fatal("Too many listen sockets. "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 996 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Too many listen sockets. " "Enlarge MAX_LISTEN_SOCKS") | ||||||
| 996 | "Enlarge MAX_LISTEN_SOCKS")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 996 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Too many listen sockets. " "Enlarge MAX_LISTEN_SOCKS"); | ||||||
| 997 | if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, | ||||||
| 998 | ntop, sizeof(ntop), strport, sizeof(strport), | ||||||
| 999 | NI_NUMERICHOST1|NI_NUMERICSERV2)) != 0) { | ||||||
| 1000 | error("getnameinfo failed: %.100s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1001, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "getnameinfo failed: %.100s" , ssh_gai_strerror(ret)) | ||||||
| 1001 | ssh_gai_strerror(ret))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1001, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "getnameinfo failed: %.100s" , ssh_gai_strerror(ret)); | ||||||
| 1002 | continue; | ||||||
| 1003 | } | ||||||
| 1004 | /* Create socket for listening. */ | ||||||
| 1005 | listen_sock = socket(ai->ai_family, ai->ai_socktype, | ||||||
| 1006 | ai->ai_protocol); | ||||||
| 1007 | if (listen_sock == -1) { | ||||||
| 1008 | /* kernel may not support ipv6 */ | ||||||
| 1009 | verbose("socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1009, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "socket: %.100s", strerror ((*__errno()))); | ||||||
| 1010 | continue; | ||||||
| 1011 | } | ||||||
| 1012 | if (set_nonblock(listen_sock) == -1) { | ||||||
| 1013 | close(listen_sock); | ||||||
| 1014 | continue; | ||||||
| 1015 | } | ||||||
| 1016 | if (fcntl(listen_sock, F_SETFD2, FD_CLOEXEC1) == -1) { | ||||||
| 1017 | verbose("socket: CLOEXEC: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1017, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "socket: CLOEXEC: %s", strerror ((*__errno()))); | ||||||
| 1018 | close(listen_sock); | ||||||
| 1019 | continue; | ||||||
| 1020 | } | ||||||
| 1021 | /* Socket options */ | ||||||
| 1022 | set_reuseaddr(listen_sock); | ||||||
| 1023 | if (la->rdomain != NULL((void*)0) && | ||||||
| 1024 | set_rdomain(listen_sock, la->rdomain) == -1) { | ||||||
| 1025 | close(listen_sock); | ||||||
| 1026 | continue; | ||||||
| 1027 | } | ||||||
| 1028 | |||||||
| 1029 | debug("Bind to port %s on %s.", strport, ntop)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1029, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Bind to port %s on %s." , strport, ntop); | ||||||
| 1030 | |||||||
| 1031 | /* Bind the socket to the desired port. */ | ||||||
| 1032 | if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) == -1) { | ||||||
| 1033 | error("Bind to port %s on %s failed: %.200s.",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1034, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Bind to port %s on %s failed: %.200s." , strport, ntop, strerror((*__errno()))) | ||||||
| 1034 | strport, ntop, strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1034, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Bind to port %s on %s failed: %.200s." , strport, ntop, strerror((*__errno()))); | ||||||
| 1035 | close(listen_sock); | ||||||
| 1036 | continue; | ||||||
| 1037 | } | ||||||
| 1038 | listen_socks[num_listen_socks] = listen_sock; | ||||||
| 1039 | num_listen_socks++; | ||||||
| 1040 | |||||||
| 1041 | /* Start listening on the port. */ | ||||||
| 1042 | if (listen(listen_sock, SSH_LISTEN_BACKLOG128) == -1) | ||||||
| 1043 | fatal("listen on [%s]:%s: %.100s",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1044 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "listen on [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))) | ||||||
| 1044 | ntop, strport, strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1044 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "listen on [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))); | ||||||
| 1045 | logit("Server listening on %s port %s%s%s.",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1048, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Server listening on %s port %s%s%s." , ntop, strport, la->rdomain == ((void*)0) ? "" : " rdomain " , la->rdomain == ((void*)0) ? "" : la->rdomain) | ||||||
| 1046 | ntop, strport,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1048, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Server listening on %s port %s%s%s." , ntop, strport, la->rdomain == ((void*)0) ? "" : " rdomain " , la->rdomain == ((void*)0) ? "" : la->rdomain) | ||||||
| 1047 | la->rdomain == NULL ? "" : " rdomain ",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1048, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Server listening on %s port %s%s%s." , ntop, strport, la->rdomain == ((void*)0) ? "" : " rdomain " , la->rdomain == ((void*)0) ? "" : la->rdomain) | ||||||
| 1048 | la->rdomain == NULL ? "" : la->rdomain)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1048, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Server listening on %s port %s%s%s." , ntop, strport, la->rdomain == ((void*)0) ? "" : " rdomain " , la->rdomain == ((void*)0) ? "" : la->rdomain); | ||||||
| 1049 | } | ||||||
| 1050 | } | ||||||
| 1051 | |||||||
| 1052 | static void | ||||||
| 1053 | server_listen(void) | ||||||
| 1054 | { | ||||||
| 1055 | u_int i; | ||||||
| 1056 | |||||||
| 1057 | /* Initialise per-source limit tracking. */ | ||||||
| 1058 | srclimit_init(options.max_startups, options.per_source_max_startups, | ||||||
| 1059 | options.per_source_masklen_ipv4, options.per_source_masklen_ipv6); | ||||||
| 1060 | |||||||
| 1061 | for (i = 0; i < options.num_listen_addrs; i++) { | ||||||
| 1062 | listen_on_addrs(&options.listen_addrs[i]); | ||||||
| 1063 | freeaddrinfo(options.listen_addrs[i].addrs); | ||||||
| 1064 | free(options.listen_addrs[i].rdomain); | ||||||
| 1065 | memset(&options.listen_addrs[i], 0, | ||||||
| 1066 | sizeof(options.listen_addrs[i])); | ||||||
| 1067 | } | ||||||
| 1068 | free(options.listen_addrs); | ||||||
| 1069 | options.listen_addrs = NULL((void*)0); | ||||||
| 1070 | options.num_listen_addrs = 0; | ||||||
| 1071 | |||||||
| 1072 | if (!num_listen_socks) | ||||||
| 1073 | fatal("Cannot bind any address.")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1073 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Cannot bind any address." ); | ||||||
| 1074 | } | ||||||
| 1075 | |||||||
| 1076 | /* | ||||||
| 1077 | * The main TCP accept loop. Note that, for the non-debug case, returns | ||||||
| 1078 | * from this function are in a forked subprocess. | ||||||
| 1079 | */ | ||||||
| 1080 | static void | ||||||
| 1081 | server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s) | ||||||
| 1082 | { | ||||||
| 1083 | struct pollfd *pfd = NULL((void*)0); | ||||||
| 1084 | int i, j, ret; | ||||||
| 1085 | int ostartups = -1, startups = 0, listening = 0, lameduck = 0; | ||||||
| 1086 | int startup_p[2] = { -1 , -1 }; | ||||||
| 1087 | char c = 0; | ||||||
| 1088 | struct sockaddr_storage from; | ||||||
| 1089 | socklen_t fromlen; | ||||||
| 1090 | pid_t pid; | ||||||
| 1091 | sigset_t nsigset, osigset; | ||||||
| 1092 | |||||||
| 1093 | /* setup fd set for accept */ | ||||||
| 1094 | /* pipes connected to unauthenticated child sshd processes */ | ||||||
| 1095 | startup_pipes = xcalloc(options.max_startups, sizeof(int)); | ||||||
| 1096 | startup_flags = xcalloc(options.max_startups, sizeof(int)); | ||||||
| 1097 | for (i = 0; i < options.max_startups; i++) | ||||||
| 1098 | startup_pipes[i] = -1; | ||||||
| 1099 | |||||||
| 1100 | /* | ||||||
| 1101 | * Prepare signal mask that we use to block signals that might set | ||||||
| 1102 | * received_sigterm or received_sighup, so that we are guaranteed | ||||||
| 1103 | * to immediately wake up the ppoll if a signal is received after | ||||||
| 1104 | * the flag is checked. | ||||||
| 1105 | */ | ||||||
| 1106 | sigemptyset(&nsigset); | ||||||
| 1107 | sigaddset(&nsigset, SIGHUP1); | ||||||
| 1108 | sigaddset(&nsigset, SIGCHLD20); | ||||||
| 1109 | sigaddset(&nsigset, SIGTERM15); | ||||||
| 1110 | sigaddset(&nsigset, SIGQUIT3); | ||||||
| 1111 | |||||||
| 1112 | pfd = xcalloc(num_listen_socks + options.max_startups, | ||||||
| 1113 | sizeof(struct pollfd)); | ||||||
| 1114 | |||||||
| 1115 | /* | ||||||
| 1116 | * Stay listening for connections until the system crashes or | ||||||
| 1117 | * the daemon is killed with a signal. | ||||||
| 1118 | */ | ||||||
| 1119 | for (;;) { | ||||||
| 1120 | sigprocmask(SIG_BLOCK1, &nsigset, &osigset); | ||||||
| 1121 | if (received_sigterm) { | ||||||
| 1122 | logit("Received signal %d; terminating.",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1123, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Received signal %d; terminating." , (int) received_sigterm) | ||||||
| 1123 | (int) received_sigterm)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1123, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Received signal %d; terminating." , (int) received_sigterm); | ||||||
| 1124 | close_listen_socks(); | ||||||
| 1125 | if (options.pid_file != NULL((void*)0)) | ||||||
| 1126 | unlink(options.pid_file); | ||||||
| 1127 | exit(received_sigterm == SIGTERM15 ? 0 : 255); | ||||||
| 1128 | } | ||||||
| 1129 | if (ostartups != startups) { | ||||||
| 1130 | setproctitle("%s [listener] %d of %d-%d startups", | ||||||
| 1131 | listener_proctitle, startups, | ||||||
| 1132 | options.max_startups_begin, options.max_startups); | ||||||
| 1133 | ostartups = startups; | ||||||
| 1134 | } | ||||||
| 1135 | if (received_sighup) { | ||||||
| 1136 | if (!lameduck) { | ||||||
| 1137 | debug("Received SIGHUP; waiting for children")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1137, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Received SIGHUP; waiting for children" ); | ||||||
| 1138 | close_listen_socks(); | ||||||
| 1139 | lameduck = 1; | ||||||
| 1140 | } | ||||||
| 1141 | if (listening <= 0) { | ||||||
| 1142 | sigprocmask(SIG_SETMASK3, &osigset, NULL((void*)0)); | ||||||
| 1143 | sighup_restart(); | ||||||
| 1144 | } | ||||||
| 1145 | } | ||||||
| 1146 | |||||||
| 1147 | for (i = 0; i < num_listen_socks; i++) { | ||||||
| 1148 | pfd[i].fd = listen_socks[i]; | ||||||
| 1149 | pfd[i].events = POLLIN0x0001; | ||||||
| 1150 | } | ||||||
| 1151 | for (i = 0; i < options.max_startups; i++) { | ||||||
| 1152 | pfd[num_listen_socks+i].fd = startup_pipes[i]; | ||||||
| 1153 | if (startup_pipes[i] != -1) | ||||||
| 1154 | pfd[num_listen_socks+i].events = POLLIN0x0001; | ||||||
| 1155 | } | ||||||
| 1156 | |||||||
| 1157 | /* Wait until a connection arrives or a child exits. */ | ||||||
| 1158 | ret = ppoll(pfd, num_listen_socks + options.max_startups, | ||||||
| 1159 | NULL((void*)0), &osigset); | ||||||
| 1160 | if (ret == -1 && errno(*__errno()) != EINTR4) | ||||||
| 1161 | error("ppoll: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1161, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "ppoll: %.100s", strerror ((*__errno()))); | ||||||
| 1162 | sigprocmask(SIG_SETMASK3, &osigset, NULL((void*)0)); | ||||||
| 1163 | if (ret == -1) | ||||||
| 1164 | continue; | ||||||
| 1165 | |||||||
| 1166 | for (i = 0; i < options.max_startups; i++) { | ||||||
| 1167 | if (startup_pipes[i] == -1 || | ||||||
| 1168 | !(pfd[num_listen_socks+i].revents & (POLLIN0x0001|POLLHUP0x0010))) | ||||||
| 1169 | continue; | ||||||
| 1170 | switch (read(startup_pipes[i], &c, sizeof(c))) { | ||||||
| 1171 | case -1: | ||||||
| 1172 | if (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35) | ||||||
| 1173 | continue; | ||||||
| 1174 | if (errno(*__errno()) != EPIPE32) { | ||||||
| 1175 | error_f("startup pipe %d (fd=%d): "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1177, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "startup pipe %d (fd=%d): " "read %s", i, startup_pipes[i], strerror((*__errno()))) | ||||||
| 1176 | "read %s", i, startup_pipes[i],sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1177, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "startup pipe %d (fd=%d): " "read %s", i, startup_pipes[i], strerror((*__errno()))) | ||||||
| 1177 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1177, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "startup pipe %d (fd=%d): " "read %s", i, startup_pipes[i], strerror((*__errno()))); | ||||||
| 1178 | } | ||||||
| 1179 | /* FALLTHROUGH */ | ||||||
| 1180 | case 0: | ||||||
| 1181 | /* child exited or completed auth */ | ||||||
| 1182 | close(startup_pipes[i]); | ||||||
| 1183 | srclimit_done(startup_pipes[i]); | ||||||
| 1184 | startup_pipes[i] = -1; | ||||||
| 1185 | startups--; | ||||||
| 1186 | if (startup_flags[i]) | ||||||
| 1187 | listening--; | ||||||
| 1188 | break; | ||||||
| 1189 | case 1: | ||||||
| 1190 | /* child has finished preliminaries */ | ||||||
| 1191 | if (startup_flags[i]) { | ||||||
| 1192 | listening--; | ||||||
| 1193 | startup_flags[i] = 0; | ||||||
| 1194 | } | ||||||
| 1195 | break; | ||||||
| 1196 | } | ||||||
| 1197 | } | ||||||
| 1198 | for (i = 0; i < num_listen_socks; i++) { | ||||||
| 1199 | if (!(pfd[i].revents & POLLIN0x0001)) | ||||||
| 1200 | continue; | ||||||
| 1201 | fromlen = sizeof(from); | ||||||
| 1202 | *newsock = accept(listen_socks[i], | ||||||
| 1203 | (struct sockaddr *)&from, &fromlen); | ||||||
| 1204 | if (*newsock == -1) { | ||||||
| 1205 | if (errno(*__errno()) != EINTR4 && errno(*__errno()) != EWOULDBLOCK35 && | ||||||
| 1206 | errno(*__errno()) != ECONNABORTED53) | ||||||
| 1207 | error("accept: %.100s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1208, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "accept: %.100s", strerror ((*__errno()))) | ||||||
| 1208 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1208, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "accept: %.100s", strerror ((*__errno()))); | ||||||
| 1209 | if (errno(*__errno()) == EMFILE24 || errno(*__errno()) == ENFILE23) | ||||||
| 1210 | usleep(100 * 1000); | ||||||
| 1211 | continue; | ||||||
| 1212 | } | ||||||
| 1213 | if (unset_nonblock(*newsock) == -1 || | ||||||
| 1214 | pipe(startup_p) == -1) { | ||||||
| 1215 | close(*newsock); | ||||||
| 1216 | continue; | ||||||
| 1217 | } | ||||||
| 1218 | if (drop_connection(*newsock, startups, startup_p[0])) { | ||||||
| 1219 | close(*newsock); | ||||||
| 1220 | close(startup_p[0]); | ||||||
| 1221 | close(startup_p[1]); | ||||||
| 1222 | continue; | ||||||
| 1223 | } | ||||||
| 1224 | |||||||
| 1225 | if (rexec_flag && socketpair(AF_UNIX1, | ||||||
| 1226 | SOCK_STREAM1, 0, config_s) == -1) { | ||||||
| 1227 | error("reexec socketpair: %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1228, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "reexec socketpair: %s", strerror ((*__errno()))) | ||||||
| 1228 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1228, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "reexec socketpair: %s", strerror ((*__errno()))); | ||||||
| 1229 | close(*newsock); | ||||||
| 1230 | close(startup_p[0]); | ||||||
| 1231 | close(startup_p[1]); | ||||||
| 1232 | continue; | ||||||
| 1233 | } | ||||||
| 1234 | |||||||
| 1235 | for (j = 0; j < options.max_startups; j++) | ||||||
| 1236 | if (startup_pipes[j] == -1) { | ||||||
| 1237 | startup_pipes[j] = startup_p[0]; | ||||||
| 1238 | startups++; | ||||||
| 1239 | startup_flags[j] = 1; | ||||||
| 1240 | break; | ||||||
| 1241 | } | ||||||
| 1242 | |||||||
| 1243 | /* | ||||||
| 1244 | * Got connection. Fork a child to handle it, unless | ||||||
| 1245 | * we are in debugging mode. | ||||||
| 1246 | */ | ||||||
| 1247 | if (debug_flag) { | ||||||
| 1248 | /* | ||||||
| 1249 | * In debugging mode. Close the listening | ||||||
| 1250 | * socket, and start processing the | ||||||
| 1251 | * connection without forking. | ||||||
| 1252 | */ | ||||||
| 1253 | debug("Server will not fork when running in debugging mode.")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1253, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Server will not fork when running in debugging mode." ); | ||||||
| 1254 | close_listen_socks(); | ||||||
| 1255 | *sock_in = *newsock; | ||||||
| 1256 | *sock_out = *newsock; | ||||||
| 1257 | close(startup_p[0]); | ||||||
| 1258 | close(startup_p[1]); | ||||||
| 1259 | startup_pipe = -1; | ||||||
| 1260 | pid = getpid(); | ||||||
| 1261 | if (rexec_flag) { | ||||||
| 1262 | send_rexec_state(config_s[0], cfg); | ||||||
| 1263 | close(config_s[0]); | ||||||
| 1264 | } | ||||||
| 1265 | free(pfd); | ||||||
| 1266 | return; | ||||||
| 1267 | } | ||||||
| 1268 | |||||||
| 1269 | /* | ||||||
| 1270 | * Normal production daemon. Fork, and have | ||||||
| 1271 | * the child process the connection. The | ||||||
| 1272 | * parent continues listening. | ||||||
| 1273 | */ | ||||||
| 1274 | listening++; | ||||||
| 1275 | if ((pid = fork()) == 0) { | ||||||
| 1276 | /* | ||||||
| 1277 | * Child. Close the listening and | ||||||
| 1278 | * max_startup sockets. Start using | ||||||
| 1279 | * the accepted socket. Reinitialize | ||||||
| 1280 | * logging (since our pid has changed). | ||||||
| 1281 | * We return from this function to handle | ||||||
| 1282 | * the connection. | ||||||
| 1283 | */ | ||||||
| 1284 | startup_pipe = startup_p[1]; | ||||||
| 1285 | close_startup_pipes(); | ||||||
| 1286 | close_listen_socks(); | ||||||
| 1287 | *sock_in = *newsock; | ||||||
| 1288 | *sock_out = *newsock; | ||||||
| 1289 | log_init(__progname, | ||||||
| 1290 | options.log_level, | ||||||
| 1291 | options.log_facility, | ||||||
| 1292 | log_stderr); | ||||||
| 1293 | if (rexec_flag) | ||||||
| 1294 | close(config_s[0]); | ||||||
| 1295 | else { | ||||||
| 1296 | /* | ||||||
| 1297 | * Signal parent that the preliminaries | ||||||
| 1298 | * for this child are complete. For the | ||||||
| 1299 | * re-exec case, this happens after the | ||||||
| 1300 | * child has received the rexec state | ||||||
| 1301 | * from the server. | ||||||
| 1302 | */ | ||||||
| 1303 | (void)atomicio(vwrite(ssize_t (*)(int, void *, size_t))write, startup_pipe, | ||||||
| 1304 | "\0", 1); | ||||||
| 1305 | } | ||||||
| 1306 | free(pfd); | ||||||
| 1307 | return; | ||||||
| 1308 | } | ||||||
| 1309 | |||||||
| 1310 | /* Parent. Stay in the loop. */ | ||||||
| 1311 | if (pid == -1) | ||||||
| 1312 | error("fork: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1312, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "fork: %.100s", strerror( (*__errno()))); | ||||||
| 1313 | else | ||||||
| 1314 | debug("Forked child %ld.", (long)pid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1314, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Forked child %ld.", (long )pid); | ||||||
| 1315 | |||||||
| 1316 | close(startup_p[1]); | ||||||
| 1317 | |||||||
| 1318 | if (rexec_flag) { | ||||||
| 1319 | close(config_s[1]); | ||||||
| 1320 | send_rexec_state(config_s[0], cfg); | ||||||
| 1321 | close(config_s[0]); | ||||||
| 1322 | } | ||||||
| 1323 | close(*newsock); | ||||||
| 1324 | } | ||||||
| 1325 | } | ||||||
| 1326 | } | ||||||
| 1327 | |||||||
| 1328 | /* | ||||||
| 1329 | * If IP options are supported, make sure there are none (log and | ||||||
| 1330 | * return an error if any are found). Basically we are worried about | ||||||
| 1331 | * source routing; it can be used to pretend you are somebody | ||||||
| 1332 | * (ip-address) you are not. That itself may be "almost acceptable" | ||||||
| 1333 | * under certain circumstances, but rhosts authentication is useless | ||||||
| 1334 | * if source routing is accepted. Notice also that if we just dropped | ||||||
| 1335 | * source routing here, the other side could use IP spoofing to do | ||||||
| 1336 | * rest of the interaction and could still bypass security. So we | ||||||
| 1337 | * exit here if we detect any IP options. | ||||||
| 1338 | */ | ||||||
| 1339 | static void | ||||||
| 1340 | check_ip_options(struct ssh *ssh) | ||||||
| 1341 | { | ||||||
| 1342 | int sock_in = ssh_packet_get_connection_in(ssh); | ||||||
| 1343 | struct sockaddr_storage from; | ||||||
| 1344 | u_char opts[200]; | ||||||
| 1345 | socklen_t i, option_size = sizeof(opts), fromlen = sizeof(from); | ||||||
| 1346 | char text[sizeof(opts) * 3 + 1]; | ||||||
| 1347 | |||||||
| 1348 | memset(&from, 0, sizeof(from)); | ||||||
| 1349 | if (getpeername(sock_in, (struct sockaddr *)&from, | ||||||
| 1350 | &fromlen) == -1) | ||||||
| 1351 | return; | ||||||
| 1352 | if (from.ss_family != AF_INET2) | ||||||
| 1353 | return; | ||||||
| 1354 | /* XXX IPv6 options? */ | ||||||
| 1355 | |||||||
| 1356 | if (getsockopt(sock_in, IPPROTO_IP0, IP_OPTIONS1, opts, | ||||||
| 1357 | &option_size) >= 0 && option_size != 0) { | ||||||
| 1358 | text[0] = '\0'; | ||||||
| 1359 | for (i = 0; i < option_size; i++) | ||||||
| 1360 | snprintf(text + i*3, sizeof(text) - i*3, | ||||||
| 1361 | " %2.2x", opts[i]); | ||||||
| 1362 | fatal("Connection from %.100s port %d with IP opts: %.800s",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1363 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Connection from %.100s port %d with IP opts: %.800s" , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text) | ||||||
| 1363 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1363 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Connection from %.100s port %d with IP opts: %.800s" , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text); | ||||||
| 1364 | } | ||||||
| 1365 | return; | ||||||
| 1366 | } | ||||||
| 1367 | |||||||
| 1368 | /* Set the routing domain for this process */ | ||||||
| 1369 | static void | ||||||
| 1370 | set_process_rdomain(struct ssh *ssh, const char *name) | ||||||
| 1371 | { | ||||||
| 1372 | int rtable, ortable = getrtable(); | ||||||
| 1373 | const char *errstr; | ||||||
| 1374 | |||||||
| 1375 | if (name == NULL((void*)0)) | ||||||
| 1376 | return; /* default */ | ||||||
| 1377 | |||||||
| 1378 | if (strcmp(name, "%D") == 0) { | ||||||
| 1379 | /* "expands" to routing domain of connection */ | ||||||
| 1380 | if ((name = ssh_packet_rdomain_in(ssh)) == NULL((void*)0)) | ||||||
| 1381 | return; | ||||||
| 1382 | } | ||||||
| 1383 | |||||||
| 1384 | rtable = (int)strtonum(name, 0, 255, &errstr); | ||||||
| 1385 | if (errstr != NULL((void*)0)) /* Shouldn't happen */ | ||||||
| 1386 | fatal("Invalid routing domain \"%s\": %s", name, errstr)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1386 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Invalid routing domain \"%s\": %s" , name, errstr); | ||||||
| 1387 | if (rtable != ortable && setrtable(rtable) != 0) | ||||||
| 1388 | fatal("Unable to set routing domain %d: %s",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1389 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Unable to set routing domain %d: %s" , rtable, strerror((*__errno()))) | ||||||
| 1389 | rtable, strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1389 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Unable to set routing domain %d: %s" , rtable, strerror((*__errno()))); | ||||||
| 1390 | debug_f("set routing domain %d (was %d)", rtable, ortable)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1390, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "set routing domain %d (was %d)" , rtable, ortable); | ||||||
| 1391 | } | ||||||
| 1392 | |||||||
| 1393 | static void | ||||||
| 1394 | accumulate_host_timing_secret(struct sshbuf *server_cfg, | ||||||
| 1395 | struct sshkey *key) | ||||||
| 1396 | { | ||||||
| 1397 | static struct ssh_digest_ctx *ctx; | ||||||
| 1398 | u_char *hash; | ||||||
| 1399 | size_t len; | ||||||
| 1400 | struct sshbuf *buf; | ||||||
| 1401 | int r; | ||||||
| 1402 | |||||||
| 1403 | if (ctx == NULL((void*)0) && (ctx = ssh_digest_start(SSH_DIGEST_SHA5124)) == NULL((void*)0)) | ||||||
| 1404 | fatal_f("ssh_digest_start")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1404 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "ssh_digest_start"); | ||||||
| 1405 | if (key == NULL((void*)0)) { /* finalize */ | ||||||
| 1406 | /* add server config in case we are using agent for host keys */ | ||||||
| 1407 | if (ssh_digest_update(ctx, sshbuf_ptr(server_cfg), | ||||||
| 1408 | sshbuf_len(server_cfg)) != 0) | ||||||
| 1409 | fatal_f("ssh_digest_update")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1409 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "ssh_digest_update"); | ||||||
| 1410 | len = ssh_digest_bytes(SSH_DIGEST_SHA5124); | ||||||
| 1411 | hash = xmalloc(len); | ||||||
| 1412 | if (ssh_digest_final(ctx, hash, len) != 0) | ||||||
| 1413 | fatal_f("ssh_digest_final")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1413 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "ssh_digest_final"); | ||||||
| 1414 | options.timing_secret = PEEK_U64(hash)(((u_int64_t)(((const u_char *)(hash))[0]) << 56) | ((u_int64_t )(((const u_char *)(hash))[1]) << 48) | ((u_int64_t)((( const u_char *)(hash))[2]) << 40) | ((u_int64_t)(((const u_char *)(hash))[3]) << 32) | ((u_int64_t)(((const u_char *)(hash))[4]) << 24) | ((u_int64_t)(((const u_char *)( hash))[5]) << 16) | ((u_int64_t)(((const u_char *)(hash ))[6]) << 8) | (u_int64_t)(((const u_char *)(hash))[7]) ); | ||||||
| 1415 | freezero(hash, len); | ||||||
| 1416 | ssh_digest_free(ctx); | ||||||
| 1417 | ctx = NULL((void*)0); | ||||||
| 1418 | return; | ||||||
| 1419 | } | ||||||
| 1420 | if ((buf = sshbuf_new()) == NULL((void*)0)) | ||||||
| 1421 | fatal_f("could not allocate buffer")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1421 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "could not allocate buffer" ); | ||||||
| 1422 | if ((r = sshkey_private_serialize(key, buf)) != 0) | ||||||
| 1423 | fatal_fr(r, "decode key")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1423 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "decode key"); | ||||||
| 1424 | if (ssh_digest_update(ctx, sshbuf_ptr(buf), sshbuf_len(buf)) != 0) | ||||||
| 1425 | fatal_f("ssh_digest_update")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1425 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "ssh_digest_update"); | ||||||
| 1426 | sshbuf_reset(buf); | ||||||
| 1427 | sshbuf_free(buf); | ||||||
| 1428 | } | ||||||
| 1429 | |||||||
| 1430 | static char * | ||||||
| 1431 | prepare_proctitle(int ac, char **av) | ||||||
| 1432 | { | ||||||
| 1433 | char *ret = NULL((void*)0); | ||||||
| 1434 | int i; | ||||||
| 1435 | |||||||
| 1436 | for (i = 0; i < ac; i++) | ||||||
| 1437 | xextendf(&ret, " ", "%s", av[i]); | ||||||
| 1438 | return ret; | ||||||
| 1439 | } | ||||||
| 1440 | |||||||
| 1441 | /* | ||||||
| 1442 | * Main program for the daemon. | ||||||
| 1443 | */ | ||||||
| 1444 | int | ||||||
| 1445 | main(int ac, char **av) | ||||||
| 1446 | { | ||||||
| 1447 | struct ssh *ssh = NULL((void*)0); | ||||||
| 1448 | extern char *optarg; | ||||||
| 1449 | extern int optind; | ||||||
| 1450 | int r, opt, on = 1, already_daemon, remote_port; | ||||||
| 1451 | int sock_in = -1, sock_out = -1, newsock = -1; | ||||||
| 1452 | const char *remote_ip, *rdomain; | ||||||
| 1453 | char *fp, *line, *laddr, *logfile = NULL((void*)0); | ||||||
| 1454 | int config_s[2] = { -1 , -1 }; | ||||||
| 1455 | u_int i, j; | ||||||
| 1456 | u_int64_t ibytes, obytes; | ||||||
| 1457 | mode_t new_umask; | ||||||
| 1458 | struct sshkey *key; | ||||||
| 1459 | struct sshkey *pubkey; | ||||||
| 1460 | int keytype; | ||||||
| 1461 | Authctxt *authctxt; | ||||||
| 1462 | struct connection_info *connection_info = NULL((void*)0); | ||||||
| 1463 | |||||||
| 1464 | /* Save argv. */ | ||||||
| 1465 | saved_argv = av; | ||||||
| 1466 | rexec_argc = ac; | ||||||
| 1467 | |||||||
| 1468 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ | ||||||
| 1469 | sanitise_stdfd(); | ||||||
| 1470 | |||||||
| 1471 | /* Initialize configuration options to their default values. */ | ||||||
| 1472 | initialize_server_options(&options); | ||||||
| 1473 | |||||||
| 1474 | /* Parse command-line arguments. */ | ||||||
| 1475 | while ((opt = getopt(ac, av, | ||||||
| |||||||
| 1476 | "C:E:b:c:f:g:h:k:o:p:u:46DQRTdeiqrt")) != -1) { | ||||||
| 1477 | switch (opt) { | ||||||
| 1478 | case '4': | ||||||
| 1479 | options.address_family = AF_INET2; | ||||||
| 1480 | break; | ||||||
| 1481 | case '6': | ||||||
| 1482 | options.address_family = AF_INET624; | ||||||
| 1483 | break; | ||||||
| 1484 | case 'f': | ||||||
| 1485 | config_file_name = optarg; | ||||||
| 1486 | break; | ||||||
| 1487 | case 'c': | ||||||
| 1488 | servconf_add_hostcert("[command-line]", 0, | ||||||
| 1489 | &options, optarg); | ||||||
| 1490 | break; | ||||||
| 1491 | case 'd': | ||||||
| 1492 | if (debug_flag == 0) { | ||||||
| 1493 | debug_flag = 1; | ||||||
| 1494 | options.log_level = SYSLOG_LEVEL_DEBUG1; | ||||||
| 1495 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) | ||||||
| 1496 | options.log_level++; | ||||||
| 1497 | break; | ||||||
| 1498 | case 'D': | ||||||
| 1499 | no_daemon_flag = 1; | ||||||
| 1500 | break; | ||||||
| 1501 | case 'E': | ||||||
| 1502 | logfile = optarg; | ||||||
| 1503 | /* FALLTHROUGH */ | ||||||
| 1504 | case 'e': | ||||||
| 1505 | log_stderr = 1; | ||||||
| 1506 | break; | ||||||
| 1507 | case 'i': | ||||||
| 1508 | inetd_flag = 1; | ||||||
| 1509 | break; | ||||||
| 1510 | case 'r': | ||||||
| 1511 | rexec_flag = 0; | ||||||
| 1512 | break; | ||||||
| 1513 | case 'R': | ||||||
| 1514 | rexeced_flag = 1; | ||||||
| 1515 | inetd_flag = 1; | ||||||
| 1516 | break; | ||||||
| 1517 | case 'Q': | ||||||
| 1518 | /* ignored */ | ||||||
| 1519 | break; | ||||||
| 1520 | case 'q': | ||||||
| 1521 | options.log_level = SYSLOG_LEVEL_QUIET; | ||||||
| 1522 | break; | ||||||
| 1523 | case 'b': | ||||||
| 1524 | /* protocol 1, ignored */ | ||||||
| 1525 | break; | ||||||
| 1526 | case 'p': | ||||||
| 1527 | options.ports_from_cmdline = 1; | ||||||
| 1528 | if (options.num_ports >= MAX_PORTS256) { | ||||||
| 1529 | fprintf(stderr(&__sF[2]), "too many ports.\n"); | ||||||
| 1530 | exit(1); | ||||||
| 1531 | } | ||||||
| 1532 | options.ports[options.num_ports++] = a2port(optarg); | ||||||
| 1533 | if (options.ports[options.num_ports-1] <= 0) { | ||||||
| 1534 | fprintf(stderr(&__sF[2]), "Bad port number.\n"); | ||||||
| 1535 | exit(1); | ||||||
| 1536 | } | ||||||
| 1537 | break; | ||||||
| 1538 | case 'g': | ||||||
| 1539 | if ((options.login_grace_time = convtime(optarg)) == -1) { | ||||||
| 1540 | fprintf(stderr(&__sF[2]), "Invalid login grace time.\n"); | ||||||
| 1541 | exit(1); | ||||||
| 1542 | } | ||||||
| 1543 | break; | ||||||
| 1544 | case 'k': | ||||||
| 1545 | /* protocol 1, ignored */ | ||||||
| 1546 | break; | ||||||
| 1547 | case 'h': | ||||||
| 1548 | servconf_add_hostkey("[command-line]", 0, | ||||||
| 1549 | &options, optarg, 1); | ||||||
| 1550 | break; | ||||||
| 1551 | case 't': | ||||||
| 1552 | test_flag = 1; | ||||||
| 1553 | break; | ||||||
| 1554 | case 'T': | ||||||
| 1555 | test_flag = 2; | ||||||
| 1556 | break; | ||||||
| 1557 | case 'C': | ||||||
| 1558 | connection_info = get_connection_info(ssh, 0, 0); | ||||||
| 1559 | if (parse_server_match_testspec(connection_info, | ||||||
| 1560 | optarg) == -1) | ||||||
| 1561 | exit(1); | ||||||
| 1562 | break; | ||||||
| 1563 | case 'u': | ||||||
| 1564 | utmp_len = (u_int)strtonum(optarg, 0, HOST_NAME_MAX255+1+1, NULL((void*)0)); | ||||||
| 1565 | if (utmp_len > HOST_NAME_MAX255+1) { | ||||||
| 1566 | fprintf(stderr(&__sF[2]), "Invalid utmp length.\n"); | ||||||
| 1567 | exit(1); | ||||||
| 1568 | } | ||||||
| 1569 | break; | ||||||
| 1570 | case 'o': | ||||||
| 1571 | line = xstrdup(optarg); | ||||||
| 1572 | if (process_server_config_line(&options, line, | ||||||
| 1573 | "command-line", 0, NULL((void*)0), NULL((void*)0), &includes) != 0) | ||||||
| 1574 | exit(1); | ||||||
| 1575 | free(line); | ||||||
| 1576 | break; | ||||||
| 1577 | case '?': | ||||||
| 1578 | default: | ||||||
| 1579 | usage(); | ||||||
| 1580 | break; | ||||||
| 1581 | } | ||||||
| 1582 | } | ||||||
| 1583 | if (rexeced_flag
| ||||||
| 1584 | rexec_flag = 0; | ||||||
| 1585 | if (!test_flag
| ||||||
| 1586 | fatal("sshd re-exec requires execution with an absolute path")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1586 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "sshd re-exec requires execution with an absolute path" ); | ||||||
| 1587 | if (rexeced_flag
| ||||||
| 1588 | closefrom(REEXEC_MIN_FREE_FD(2 + 4)); | ||||||
| 1589 | else | ||||||
| 1590 | closefrom(REEXEC_DEVCRYPTO_RESERVED_FD(2 + 1)); | ||||||
| 1591 | |||||||
| 1592 | #ifdef WITH_OPENSSL1 | ||||||
| 1593 | OpenSSL_add_all_algorithms()OPENSSL_add_all_algorithms_noconf(); | ||||||
| 1594 | #endif | ||||||
| 1595 | |||||||
| 1596 | /* If requested, redirect the logs to the specified logfile. */ | ||||||
| 1597 | if (logfile
| ||||||
| 1598 | log_redirect_stderr_to(logfile); | ||||||
| 1599 | /* | ||||||
| 1600 | * Force logging to stderr until we have loaded the private host | ||||||
| 1601 | * key (unless started from inetd) | ||||||
| 1602 | */ | ||||||
| 1603 | log_init(__progname, | ||||||
| 1604 | options.log_level == SYSLOG_LEVEL_NOT_SET ? | ||||||
| 1605 | SYSLOG_LEVEL_INFO : options.log_level, | ||||||
| 1606 | options.log_facility == SYSLOG_FACILITY_NOT_SET ? | ||||||
| 1607 | SYSLOG_FACILITY_AUTH : options.log_facility, | ||||||
| 1608 | log_stderr
| ||||||
| 1609 | |||||||
| 1610 | sensitive_data.have_ssh2_key = 0; | ||||||
| 1611 | |||||||
| 1612 | /* | ||||||
| 1613 | * If we're not doing an extended test do not silently ignore connection | ||||||
| 1614 | * test params. | ||||||
| 1615 | */ | ||||||
| 1616 | if (test_flag
| ||||||
| 1617 | fatal("Config test connection parameter (-C) provided without "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1618 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Config test connection parameter (-C) provided without " "test mode (-T)") | ||||||
| 1618 | "test mode (-T)")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1618 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Config test connection parameter (-C) provided without " "test mode (-T)"); | ||||||
| 1619 | |||||||
| 1620 | /* Fetch our configuration */ | ||||||
| 1621 | if ((cfg = sshbuf_new()) == NULL((void*)0)) | ||||||
| 1622 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1622 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed"); | ||||||
| 1623 | if (rexeced_flag
| ||||||
| 1624 | setproctitle("%s", "[rexeced]"); | ||||||
| 1625 | recv_rexec_state(REEXEC_CONFIG_PASS_FD(2 + 3), cfg); | ||||||
| 1626 | if (!debug_flag) { | ||||||
| 1627 | startup_pipe = dup(REEXEC_STARTUP_PIPE_FD(2 + 2)); | ||||||
| 1628 | close(REEXEC_STARTUP_PIPE_FD(2 + 2)); | ||||||
| 1629 | /* | ||||||
| 1630 | * Signal parent that this child is at a point where | ||||||
| 1631 | * they can go away if they have a SIGHUP pending. | ||||||
| 1632 | */ | ||||||
| 1633 | (void)atomicio(vwrite(ssize_t (*)(int, void *, size_t))write, startup_pipe, "\0", 1); | ||||||
| 1634 | } | ||||||
| 1635 | } else if (strcasecmp(config_file_name, "none") != 0) | ||||||
| 1636 | load_server_config(config_file_name, cfg); | ||||||
| 1637 | |||||||
| 1638 | parse_server_config(&options, rexeced_flag
| ||||||
| 1639 | cfg, &includes, NULL((void*)0)); | ||||||
| 1640 | |||||||
| 1641 | #ifdef WITH_OPENSSL1 | ||||||
| 1642 | if (options.moduli_file != NULL((void*)0)) | ||||||
| 1643 | dh_set_moduli_file(options.moduli_file); | ||||||
| 1644 | #endif | ||||||
| 1645 | |||||||
| 1646 | /* Fill in default values for those options not explicitly set. */ | ||||||
| 1647 | fill_default_server_options(&options); | ||||||
| 1648 | |||||||
| 1649 | /* Check that options are sensible */ | ||||||
| 1650 | if (options.authorized_keys_command_user == NULL((void*)0) && | ||||||
| 1651 | (options.authorized_keys_command != NULL((void*)0) && | ||||||
| 1652 | strcasecmp(options.authorized_keys_command, "none") != 0)) | ||||||
| 1653 | fatal("AuthorizedKeysCommand set without "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1654 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "AuthorizedKeysCommand set without " "AuthorizedKeysCommandUser") | ||||||
| 1654 | "AuthorizedKeysCommandUser")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1654 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "AuthorizedKeysCommand set without " "AuthorizedKeysCommandUser"); | ||||||
| 1655 | if (options.authorized_principals_command_user == NULL((void*)0) && | ||||||
| 1656 | (options.authorized_principals_command != NULL((void*)0) && | ||||||
| 1657 | strcasecmp(options.authorized_principals_command, "none") != 0)) | ||||||
| 1658 | fatal("AuthorizedPrincipalsCommand set without "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1659 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "AuthorizedPrincipalsCommand set without " "AuthorizedPrincipalsCommandUser") | ||||||
| 1659 | "AuthorizedPrincipalsCommandUser")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1659 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "AuthorizedPrincipalsCommand set without " "AuthorizedPrincipalsCommandUser"); | ||||||
| 1660 | |||||||
| 1661 | /* | ||||||
| 1662 | * Check whether there is any path through configured auth methods. | ||||||
| 1663 | * Unfortunately it is not possible to verify this generally before | ||||||
| 1664 | * daemonisation in the presence of Match block, but this catches | ||||||
| 1665 | * and warns for trivial misconfigurations that could break login. | ||||||
| 1666 | */ | ||||||
| 1667 | if (options.num_auth_methods != 0) { | ||||||
| 1668 | for (i = 0; i < options.num_auth_methods; i++) { | ||||||
| 1669 | if (auth2_methods_valid(options.auth_methods[i], | ||||||
| 1670 | 1) == 0) | ||||||
| 1671 | break; | ||||||
| 1672 | } | ||||||
| 1673 | if (i >= options.num_auth_methods) | ||||||
| 1674 | fatal("AuthenticationMethods cannot be satisfied by "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1675 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "AuthenticationMethods cannot be satisfied by " "enabled authentication methods") | ||||||
| 1675 | "enabled authentication methods")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1675 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "AuthenticationMethods cannot be satisfied by " "enabled authentication methods"); | ||||||
| 1676 | } | ||||||
| 1677 | |||||||
| 1678 | /* Check that there are no remaining arguments. */ | ||||||
| 1679 | if (optind < ac) { | ||||||
| 1680 | fprintf(stderr(&__sF[2]), "Extra argument %s.\n", av[optind]); | ||||||
| 1681 | exit(1); | ||||||
| 1682 | } | ||||||
| 1683 | |||||||
| 1684 | debug("sshd version %s, %s", SSH_VERSION, SSH_OPENSSL_VERSION)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1684, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "sshd version %s, %s", "OpenSSH_8.8" , OpenSSL_version(0)); | ||||||
| 1685 | |||||||
| 1686 | /* load host keys */ | ||||||
| 1687 | sensitive_data.host_keys = xcalloc(options.num_host_key_files, | ||||||
| 1688 | sizeof(struct sshkey *)); | ||||||
| 1689 | sensitive_data.host_pubkeys = xcalloc(options.num_host_key_files, | ||||||
| 1690 | sizeof(struct sshkey *)); | ||||||
| 1691 | |||||||
| 1692 | if (options.host_key_agent) { | ||||||
| 1693 | if (strcmp(options.host_key_agent, SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK")) | ||||||
| 1694 | setenv(SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK", | ||||||
| 1695 | options.host_key_agent, 1); | ||||||
| 1696 | if ((r = ssh_get_authentication_socket(NULL((void*)0))) == 0) | ||||||
| 1697 | have_agent = 1; | ||||||
| 1698 | else | ||||||
| 1699 | error_r(r, "Could not connect to agent \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1700, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not connect to agent \"%s\"" , options.host_key_agent) | ||||||
| 1700 | options.host_key_agent)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1700, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not connect to agent \"%s\"" , options.host_key_agent); | ||||||
| 1701 | } | ||||||
| 1702 | |||||||
| 1703 | for (i = 0; i < options.num_host_key_files; i++) { | ||||||
| 1704 | int ll = options.host_key_file_userprovided[i] ? | ||||||
| 1705 | SYSLOG_LEVEL_ERROR : SYSLOG_LEVEL_DEBUG1; | ||||||
| 1706 | |||||||
| 1707 | if (options.host_key_files[i] == NULL((void*)0)) | ||||||
| 1708 | continue; | ||||||
| 1709 | if ((r = sshkey_load_private(options.host_key_files[i], "", | ||||||
| 1710 | &key, NULL((void*)0))) != 0 && r != SSH_ERR_SYSTEM_ERROR-24) | ||||||
| 1711 | do_log2_r(r, ll, "Unable to load host key \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1712, 0, ll, ssh_err(r), "Unable to load host key \"%s\"", options .host_key_files[i]) | ||||||
| 1712 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1712, 0, ll, ssh_err(r), "Unable to load host key \"%s\"", options .host_key_files[i]); | ||||||
| 1713 | if (sshkey_is_sk(key) && | ||||||
| 1714 | key->sk_flags & SSH_SK_USER_PRESENCE_REQD0x01) { | ||||||
| 1715 | debug("host key %s requires user presence, ignoring",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1716, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "host key %s requires user presence, ignoring" , options.host_key_files[i]) | ||||||
| 1716 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1716, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "host key %s requires user presence, ignoring" , options.host_key_files[i]); | ||||||
| 1717 | key->sk_flags &= ~SSH_SK_USER_PRESENCE_REQD0x01; | ||||||
| 1718 | } | ||||||
| 1719 | if (r == 0 && key != NULL((void*)0) && | ||||||
| 1720 | (r = sshkey_shield_private(key)) != 0) { | ||||||
| 1721 | do_log2_r(r, ll, "Unable to shield host key \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1722, 0, ll, ssh_err(r), "Unable to shield host key \"%s\"", options .host_key_files[i]) | ||||||
| 1722 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1722, 0, ll, ssh_err(r), "Unable to shield host key \"%s\"", options .host_key_files[i]); | ||||||
| 1723 | sshkey_free(key); | ||||||
| 1724 | key = NULL((void*)0); | ||||||
| 1725 | } | ||||||
| 1726 | if ((r = sshkey_load_public(options.host_key_files[i], | ||||||
| 1727 | &pubkey, NULL((void*)0))) != 0 && r != SSH_ERR_SYSTEM_ERROR-24) | ||||||
| 1728 | do_log2_r(r, ll, "Unable to load host key \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1729, 0, ll, ssh_err(r), "Unable to load host key \"%s\"", options .host_key_files[i]) | ||||||
| 1729 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1729, 0, ll, ssh_err(r), "Unable to load host key \"%s\"", options .host_key_files[i]); | ||||||
| 1730 | if (pubkey != NULL((void*)0) && key != NULL((void*)0)) { | ||||||
| 1731 | if (!sshkey_equal(pubkey, key)) { | ||||||
| 1732 | error("Public key for %s does not match "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1733, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Public key for %s does not match " "private key", options.host_key_files[i]) | ||||||
| 1733 | "private key", options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1733, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Public key for %s does not match " "private key", options.host_key_files[i]); | ||||||
| 1734 | sshkey_free(pubkey); | ||||||
| 1735 | pubkey = NULL((void*)0); | ||||||
| 1736 | } | ||||||
| 1737 | } | ||||||
| 1738 | if (pubkey == NULL((void*)0) && key != NULL((void*)0)) { | ||||||
| 1739 | if ((r = sshkey_from_private(key, &pubkey)) != 0) | ||||||
| 1740 | fatal_r(r, "Could not demote key: \"%s\"",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1741 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "Could not demote key: \"%s\"" , options.host_key_files[i]) | ||||||
| 1741 | options.host_key_files[i])sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1741 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "Could not demote key: \"%s\"" , options.host_key_files[i]); | ||||||
| 1742 | } | ||||||
| 1743 | sensitive_data.host_keys[i] = key; | ||||||
| 1744 | sensitive_data.host_pubkeys[i] = pubkey; | ||||||
| 1745 | |||||||
| 1746 | if (key == NULL((void*)0) && pubkey != NULL((void*)0) && have_agent) { | ||||||
| 1747 | debug("will rely on agent for hostkey %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1748, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "will rely on agent for hostkey %s" , options.host_key_files[i]) | ||||||
| 1748 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1748, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "will rely on agent for hostkey %s" , options.host_key_files[i]); | ||||||
| 1749 | keytype = pubkey->type; | ||||||
| 1750 | } else if (key != NULL((void*)0)) { | ||||||
| 1751 | keytype = key->type; | ||||||
| 1752 | accumulate_host_timing_secret(cfg, key); | ||||||
| 1753 | } else { | ||||||
| 1754 | do_log2(ll, "Unable to load host key: %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1755, 0, ll, ((void*)0), "Unable to load host key: %s", options.host_key_files [i]) | ||||||
| 1755 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1755, 0, ll, ((void*)0), "Unable to load host key: %s", options.host_key_files [i]); | ||||||
| 1756 | sensitive_data.host_keys[i] = NULL((void*)0); | ||||||
| 1757 | sensitive_data.host_pubkeys[i] = NULL((void*)0); | ||||||
| 1758 | continue; | ||||||
| 1759 | } | ||||||
| 1760 | |||||||
| 1761 | switch (keytype) { | ||||||
| 1762 | case KEY_RSA: | ||||||
| 1763 | case KEY_DSA: | ||||||
| 1764 | case KEY_ECDSA: | ||||||
| 1765 | case KEY_ED25519: | ||||||
| 1766 | case KEY_ECDSA_SK: | ||||||
| 1767 | case KEY_ED25519_SK: | ||||||
| 1768 | case KEY_XMSS: | ||||||
| 1769 | if (have_agent || key != NULL((void*)0)) | ||||||
| 1770 | sensitive_data.have_ssh2_key = 1; | ||||||
| 1771 | break; | ||||||
| 1772 | } | ||||||
| 1773 | if ((fp = sshkey_fingerprint(pubkey, options.fingerprint_hash, | ||||||
| 1774 | SSH_FP_DEFAULT)) == NULL((void*)0)) | ||||||
| 1775 | fatal("sshkey_fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1775 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "sshkey_fingerprint failed" ); | ||||||
| 1776 | debug("%s host key #%d: %s %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1777, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "%s host key #%d: %s %s" , key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp) | ||||||
| 1777 | key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1777, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "%s host key #%d: %s %s" , key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp); | ||||||
| 1778 | free(fp); | ||||||
| 1779 | } | ||||||
| 1780 | accumulate_host_timing_secret(cfg, NULL((void*)0)); | ||||||
| 1781 | if (!sensitive_data.have_ssh2_key) { | ||||||
| 1782 | logit("sshd: no hostkeys available -- exiting.")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1782, 0, SYSLOG_LEVEL_INFO, ((void*)0), "sshd: no hostkeys available -- exiting." ); | ||||||
| 1783 | exit(1); | ||||||
| 1784 | } | ||||||
| 1785 | |||||||
| 1786 | /* | ||||||
| 1787 | * Load certificates. They are stored in an array at identical | ||||||
| 1788 | * indices to the public keys that they relate to. | ||||||
| 1789 | */ | ||||||
| 1790 | sensitive_data.host_certificates = xcalloc(options.num_host_key_files, | ||||||
| 1791 | sizeof(struct sshkey *)); | ||||||
| 1792 | for (i = 0; i < options.num_host_key_files; i++) | ||||||
| 1793 | sensitive_data.host_certificates[i] = NULL((void*)0); | ||||||
| 1794 | |||||||
| 1795 | for (i = 0; i < options.num_host_cert_files; i++) { | ||||||
| 1796 | if (options.host_cert_files[i] == NULL((void*)0)) | ||||||
| 1797 | continue; | ||||||
| 1798 | if ((r = sshkey_load_public(options.host_cert_files[i], | ||||||
| 1799 | &key, NULL((void*)0))) != 0) { | ||||||
| 1800 | error_r(r, "Could not load host certificate \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1801, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not load host certificate \"%s\"" , options.host_cert_files[i]) | ||||||
| 1801 | options.host_cert_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1801, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not load host certificate \"%s\"" , options.host_cert_files[i]); | ||||||
| 1802 | continue; | ||||||
| 1803 | } | ||||||
| 1804 | if (!sshkey_is_cert(key)) { | ||||||
| 1805 | error("Certificate file is not a certificate: %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1806, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Certificate file is not a certificate: %s" , options.host_cert_files[i]) | ||||||
| 1806 | options.host_cert_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1806, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Certificate file is not a certificate: %s" , options.host_cert_files[i]); | ||||||
| 1807 | sshkey_free(key); | ||||||
| 1808 | continue; | ||||||
| 1809 | } | ||||||
| 1810 | /* Find matching private key */ | ||||||
| 1811 | for (j = 0; j < options.num_host_key_files; j++) { | ||||||
| 1812 | if (sshkey_equal_public(key, | ||||||
| 1813 | sensitive_data.host_pubkeys[j])) { | ||||||
| 1814 | sensitive_data.host_certificates[j] = key; | ||||||
| 1815 | break; | ||||||
| 1816 | } | ||||||
| 1817 | } | ||||||
| 1818 | if (j >= options.num_host_key_files) { | ||||||
| 1819 | error("No matching private key for certificate: %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1820, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "No matching private key for certificate: %s" , options.host_cert_files[i]) | ||||||
| 1820 | options.host_cert_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1820, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "No matching private key for certificate: %s" , options.host_cert_files[i]); | ||||||
| 1821 | sshkey_free(key); | ||||||
| 1822 | continue; | ||||||
| 1823 | } | ||||||
| 1824 | sensitive_data.host_certificates[j] = key; | ||||||
| 1825 | debug("host certificate: #%u type %d %s", j, key->type,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1826, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "host certificate: #%u type %d %s" , j, key->type, sshkey_type(key)) | ||||||
| 1826 | sshkey_type(key))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1826, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "host certificate: #%u type %d %s" , j, key->type, sshkey_type(key)); | ||||||
| 1827 | } | ||||||
| 1828 | |||||||
| 1829 | if (use_privsep
| ||||||
| 1830 | struct stat st; | ||||||
| 1831 | |||||||
| 1832 | if (getpwnam(SSH_PRIVSEP_USER"sshd") == NULL((void*)0)) | ||||||
| 1833 | fatal("Privilege separation user %s does not exist",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1834 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Privilege separation user %s does not exist" , "sshd") | ||||||
| 1834 | SSH_PRIVSEP_USER)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1834 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Privilege separation user %s does not exist" , "sshd"); | ||||||
| 1835 | endpwent(); | ||||||
| 1836 | if ((stat(_PATH_PRIVSEP_CHROOT_DIR"/var/empty", &st) == -1) || | ||||||
| 1837 | (S_ISDIR(st.st_mode)((st.st_mode & 0170000) == 0040000) == 0)) | ||||||
| 1838 | fatal("Missing privilege separation directory: %s",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1839 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Missing privilege separation directory: %s" , "/var/empty") | ||||||
| 1839 | _PATH_PRIVSEP_CHROOT_DIR)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1839 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Missing privilege separation directory: %s" , "/var/empty"); | ||||||
| 1840 | if (st.st_uid != 0 || (st.st_mode & (S_IWGRP0000020|S_IWOTH0000002)) != 0) | ||||||
| 1841 | fatal("%s must be owned by root and not group or "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1842 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "%s must be owned by root and not group or " "world-writable.", "/var/empty") | ||||||
| 1842 | "world-writable.", _PATH_PRIVSEP_CHROOT_DIR)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1842 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "%s must be owned by root and not group or " "world-writable.", "/var/empty"); | ||||||
| 1843 | } | ||||||
| 1844 | |||||||
| 1845 | if (test_flag
| ||||||
| 1846 | /* | ||||||
| 1847 | * If no connection info was provided by -C then use | ||||||
| 1848 | * use a blank one that will cause no predicate to match. | ||||||
| 1849 | */ | ||||||
| 1850 | if (connection_info == NULL((void*)0)) | ||||||
| 1851 | connection_info = get_connection_info(ssh, 0, 0); | ||||||
| 1852 | connection_info->test = 1; | ||||||
| 1853 | parse_server_match_config(&options, &includes, connection_info); | ||||||
| 1854 | dump_config(&options); | ||||||
| 1855 | } | ||||||
| 1856 | |||||||
| 1857 | /* Configuration looks good, so exit if in test mode. */ | ||||||
| 1858 | if (test_flag
| ||||||
| 1859 | exit(0); | ||||||
| 1860 | |||||||
| 1861 | if (rexec_flag
| ||||||
| 1862 | if (rexec_argc
| ||||||
| 1863 | fatal("rexec_argc %d < 0", rexec_argc)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1863 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "rexec_argc %d < 0", rexec_argc ); | ||||||
| 1864 | rexec_argv = xcalloc(rexec_argc + 2, sizeof(char *)); | ||||||
| 1865 | for (i = 0; i < (u_int)rexec_argc; i++) { | ||||||
| 1866 | debug("rexec_argv[%d]='%s'", i, saved_argv[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1866, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rexec_argv[%d]='%s'", i , saved_argv[i]); | ||||||
| 1867 | rexec_argv[i] = saved_argv[i]; | ||||||
| 1868 | } | ||||||
| 1869 | rexec_argv[rexec_argc] = "-R"; | ||||||
| 1870 | rexec_argv[rexec_argc + 1] = NULL((void*)0); | ||||||
| 1871 | } | ||||||
| 1872 | listener_proctitle = prepare_proctitle(ac, av); | ||||||
| 1873 | |||||||
| 1874 | /* Ensure that umask disallows at least group and world write */ | ||||||
| 1875 | new_umask = umask(0077) | 0022; | ||||||
| 1876 | (void) umask(new_umask); | ||||||
| 1877 | |||||||
| 1878 | /* Initialize the log (it is reinitialized below in case we forked). */ | ||||||
| 1879 | if (debug_flag
| ||||||
| 1880 | log_stderr = 1; | ||||||
| 1881 | log_init(__progname, options.log_level, | ||||||
| 1882 | options.log_facility, log_stderr); | ||||||
| 1883 | for (i = 0; i < options.num_log_verbose; i++) | ||||||
| 1884 | log_verbose_add(options.log_verbose[i]); | ||||||
| 1885 | |||||||
| 1886 | /* | ||||||
| 1887 | * If not in debugging mode, not started from inetd and not already | ||||||
| 1888 | * daemonized (eg re-exec via SIGHUP), disconnect from the controlling | ||||||
| 1889 | * terminal, and fork. The original process exits. | ||||||
| 1890 | */ | ||||||
| 1891 | already_daemon = daemonized(); | ||||||
| 1892 | if (!(debug_flag
| ||||||
| 1893 | |||||||
| 1894 | if (daemon(0, 0) == -1) | ||||||
| 1895 | fatal("daemon() failed: %.200s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1895 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "daemon() failed: %.200s" , strerror((*__errno()))); | ||||||
| 1896 | |||||||
| 1897 | disconnect_controlling_tty(); | ||||||
| 1898 | } | ||||||
| 1899 | /* Reinitialize the log (because of the fork above). */ | ||||||
| 1900 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | ||||||
| 1901 | |||||||
| 1902 | /* | ||||||
| 1903 | * Chdir to the root directory so that the current disk can be | ||||||
| 1904 | * unmounted if desired. | ||||||
| 1905 | */ | ||||||
| 1906 | if (chdir("/") == -1) | ||||||
| 1907 | error("chdir(\"/\"): %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1907, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "chdir(\"/\"): %s", strerror ((*__errno()))); | ||||||
| 1908 | |||||||
| 1909 | /* ignore SIGPIPE */ | ||||||
| 1910 | ssh_signal(SIGPIPE13, SIG_IGN(void (*)(int))1); | ||||||
| 1911 | |||||||
| 1912 | /* Get a connection, either from inetd or a listening TCP socket */ | ||||||
| 1913 | if (inetd_flag
| ||||||
| 1914 | server_accept_inetd(&sock_in, &sock_out); | ||||||
| 1915 | } else { | ||||||
| 1916 | server_listen(); | ||||||
| 1917 | |||||||
| 1918 | ssh_signal(SIGHUP1, sighup_handler); | ||||||
| 1919 | ssh_signal(SIGCHLD20, main_sigchld_handler); | ||||||
| 1920 | ssh_signal(SIGTERM15, sigterm_handler); | ||||||
| 1921 | ssh_signal(SIGQUIT3, sigterm_handler); | ||||||
| 1922 | |||||||
| 1923 | /* | ||||||
| 1924 | * Write out the pid file after the sigterm handler | ||||||
| 1925 | * is setup and the listen sockets are bound | ||||||
| 1926 | */ | ||||||
| 1927 | if (options.pid_file != NULL((void*)0) && !debug_flag) { | ||||||
| 1928 | FILE *f = fopen(options.pid_file, "w"); | ||||||
| 1929 | |||||||
| 1930 | if (f == NULL((void*)0)) { | ||||||
| 1931 | error("Couldn't create pid file \"%s\": %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1932, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Couldn't create pid file \"%s\": %s" , options.pid_file, strerror((*__errno()))) | ||||||
| 1932 | options.pid_file, strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1932, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Couldn't create pid file \"%s\": %s" , options.pid_file, strerror((*__errno()))); | ||||||
| 1933 | } else { | ||||||
| 1934 | fprintf(f, "%ld\n", (long) getpid()); | ||||||
| 1935 | fclose(f); | ||||||
| 1936 | } | ||||||
| 1937 | } | ||||||
| 1938 | |||||||
| 1939 | /* Accept a connection and return in a forked child */ | ||||||
| 1940 | server_accept_loop(&sock_in, &sock_out, | ||||||
| 1941 | &newsock, config_s); | ||||||
| 1942 | } | ||||||
| 1943 | |||||||
| 1944 | /* This is the child processing a new connection. */ | ||||||
| 1945 | setproctitle("%s", "[accepted]"); | ||||||
| 1946 | |||||||
| 1947 | /* | ||||||
| 1948 | * Create a new session and process group since the 4.4BSD | ||||||
| 1949 | * setlogin() affects the entire process group. We don't | ||||||
| 1950 | * want the child to be able to affect the parent. | ||||||
| 1951 | */ | ||||||
| 1952 | if (!debug_flag
| ||||||
| 1953 | error("setsid: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1953, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "setsid: %.100s", strerror ((*__errno()))); | ||||||
| 1954 | |||||||
| 1955 | if (rexec_flag
| ||||||
| 1956 | debug("rexec start in %d out %d newsock %d pipe %d sock %d",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1957, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rexec start in %d out %d newsock %d pipe %d sock %d" , sock_in, sock_out, newsock, startup_pipe, config_s[0]) | ||||||
| 1957 | sock_in, sock_out, newsock, startup_pipe, config_s[0])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1957, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rexec start in %d out %d newsock %d pipe %d sock %d" , sock_in, sock_out, newsock, startup_pipe, config_s[0]); | ||||||
| 1958 | dup2(newsock, STDIN_FILENO0); | ||||||
| 1959 | dup2(STDIN_FILENO0, STDOUT_FILENO1); | ||||||
| 1960 | if (startup_pipe == -1) | ||||||
| 1961 | close(REEXEC_STARTUP_PIPE_FD(2 + 2)); | ||||||
| 1962 | else if (startup_pipe != REEXEC_STARTUP_PIPE_FD(2 + 2)) { | ||||||
| 1963 | dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD(2 + 2)); | ||||||
| 1964 | close(startup_pipe); | ||||||
| 1965 | startup_pipe = REEXEC_STARTUP_PIPE_FD(2 + 2); | ||||||
| 1966 | } | ||||||
| 1967 | |||||||
| 1968 | dup2(config_s[1], REEXEC_CONFIG_PASS_FD(2 + 3)); | ||||||
| 1969 | close(config_s[1]); | ||||||
| 1970 | |||||||
| 1971 | ssh_signal(SIGHUP1, SIG_IGN(void (*)(int))1); /* avoid reset to SIG_DFL */ | ||||||
| 1972 | execv(rexec_argv[0], rexec_argv); | ||||||
| 1973 | |||||||
| 1974 | /* Reexec has failed, fall back and continue */ | ||||||
| 1975 | error("rexec of %s failed: %s", rexec_argv[0], strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1975, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "rexec of %s failed: %s", rexec_argv[0], strerror((*__errno()))); | ||||||
| 1976 | recv_rexec_state(REEXEC_CONFIG_PASS_FD(2 + 3), NULL((void*)0)); | ||||||
| 1977 | log_init(__progname, options.log_level, | ||||||
| 1978 | options.log_facility, log_stderr); | ||||||
| 1979 | |||||||
| 1980 | /* Clean up fds */ | ||||||
| 1981 | close(REEXEC_CONFIG_PASS_FD(2 + 3)); | ||||||
| 1982 | newsock = sock_out = sock_in = dup(STDIN_FILENO0); | ||||||
| 1983 | if (stdfd_devnull(1, 1, 0) == -1) | ||||||
| 1984 | error_f("stdfd_devnull failed")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1984, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "stdfd_devnull failed"); | ||||||
| 1985 | debug("rexec cleanup in %d out %d newsock %d pipe %d sock %d",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1986, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rexec cleanup in %d out %d newsock %d pipe %d sock %d" , sock_in, sock_out, newsock, startup_pipe, config_s[0]) | ||||||
| 1986 | sock_in, sock_out, newsock, startup_pipe, config_s[0])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1986, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rexec cleanup in %d out %d newsock %d pipe %d sock %d" , sock_in, sock_out, newsock, startup_pipe, config_s[0]); | ||||||
| 1987 | } | ||||||
| 1988 | |||||||
| 1989 | /* Executed child processes don't need these. */ | ||||||
| 1990 | fcntl(sock_out, F_SETFD2, FD_CLOEXEC1); | ||||||
| 1991 | fcntl(sock_in, F_SETFD2, FD_CLOEXEC1); | ||||||
| 1992 | |||||||
| 1993 | /* We will not restart on SIGHUP since it no longer makes sense. */ | ||||||
| 1994 | ssh_signal(SIGALRM14, SIG_DFL(void (*)(int))0); | ||||||
| 1995 | ssh_signal(SIGHUP1, SIG_DFL(void (*)(int))0); | ||||||
| 1996 | ssh_signal(SIGTERM15, SIG_DFL(void (*)(int))0); | ||||||
| 1997 | ssh_signal(SIGQUIT3, SIG_DFL(void (*)(int))0); | ||||||
| 1998 | ssh_signal(SIGCHLD20, SIG_DFL(void (*)(int))0); | ||||||
| 1999 | |||||||
| 2000 | /* | ||||||
| 2001 | * Register our connection. This turns encryption off because we do | ||||||
| 2002 | * not have a key. | ||||||
| 2003 | */ | ||||||
| 2004 | if ((ssh = ssh_packet_set_connection(NULL((void*)0), sock_in, sock_out)) == NULL((void*)0)) | ||||||
| 2005 | fatal("Unable to create connection")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2005 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Unable to create connection" ); | ||||||
| 2006 | the_active_state = ssh; | ||||||
| 2007 | ssh_packet_set_server(ssh); | ||||||
| 2008 | |||||||
| 2009 | check_ip_options(ssh); | ||||||
| 2010 | |||||||
| 2011 | /* Prepare the channels layer */ | ||||||
| 2012 | channel_init_channels(ssh); | ||||||
| 2013 | channel_set_af(ssh, options.address_family); | ||||||
| 2014 | process_permitopen(ssh, &options); | ||||||
| 2015 | |||||||
| 2016 | /* Set SO_KEEPALIVE if requested. */ | ||||||
| 2017 | if (options.tcp_keep_alive && ssh_packet_connection_is_on_socket(ssh) && | ||||||
| 2018 | setsockopt(sock_in, SOL_SOCKET0xffff, SO_KEEPALIVE0x0008, &on, sizeof(on)) == -1) | ||||||
| 2019 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2019, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "setsockopt SO_KEEPALIVE: %.100s" , strerror((*__errno()))); | ||||||
| 2020 | |||||||
| 2021 | if ((remote_port = ssh_remote_port(ssh)) < 0) { | ||||||
| 2022 | debug("ssh_remote_port failed")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2022, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "ssh_remote_port failed" ); | ||||||
| 2023 | cleanup_exit(255); | ||||||
| 2024 | } | ||||||
| 2025 | |||||||
| 2026 | /* | ||||||
| 2027 | * The rest of the code depends on the fact that | ||||||
| 2028 | * ssh_remote_ipaddr() caches the remote ip, even if | ||||||
| 2029 | * the socket goes away. | ||||||
| 2030 | */ | ||||||
| 2031 | remote_ip = ssh_remote_ipaddr(ssh); | ||||||
| 2032 | |||||||
| 2033 | rdomain = ssh_packet_rdomain_in(ssh); | ||||||
| 2034 | |||||||
| 2035 | /* Log the connection. */ | ||||||
| 2036 | laddr = get_local_ipaddr(sock_in); | ||||||
| 2037 | verbose("Connection from %s port %d on %s port %d%s%s%s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2041, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Connection from %s port %d on %s port %d%s%s%s" , remote_ip, remote_port, laddr, ssh_local_port(ssh), rdomain == ((void*)0) ? "" : " rdomain \"", rdomain == ((void*)0) ? "" : rdomain, rdomain == ((void*)0) ? "" : "\"") | ||||||
| 2038 | remote_ip, remote_port, laddr, ssh_local_port(ssh),sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2041, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Connection from %s port %d on %s port %d%s%s%s" , remote_ip, remote_port, laddr, ssh_local_port(ssh), rdomain == ((void*)0) ? "" : " rdomain \"", rdomain == ((void*)0) ? "" : rdomain, rdomain == ((void*)0) ? "" : "\"") | ||||||
| 2039 | rdomain == NULL ? "" : " rdomain \"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2041, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Connection from %s port %d on %s port %d%s%s%s" , remote_ip, remote_port, laddr, ssh_local_port(ssh), rdomain == ((void*)0) ? "" : " rdomain \"", rdomain == ((void*)0) ? "" : rdomain, rdomain == ((void*)0) ? "" : "\"") | ||||||
| 2040 | rdomain == NULL ? "" : rdomain,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2041, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Connection from %s port %d on %s port %d%s%s%s" , remote_ip, remote_port, laddr, ssh_local_port(ssh), rdomain == ((void*)0) ? "" : " rdomain \"", rdomain == ((void*)0) ? "" : rdomain, rdomain == ((void*)0) ? "" : "\"") | ||||||
| 2041 | rdomain == NULL ? "" : "\"")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2041, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Connection from %s port %d on %s port %d%s%s%s" , remote_ip, remote_port, laddr, ssh_local_port(ssh), rdomain == ((void*)0) ? "" : " rdomain \"", rdomain == ((void*)0) ? "" : rdomain, rdomain == ((void*)0) ? "" : "\""); | ||||||
| 2042 | free(laddr); | ||||||
| 2043 | |||||||
| 2044 | /* | ||||||
| 2045 | * We don't want to listen forever unless the other side | ||||||
| 2046 | * successfully authenticates itself. So we set up an alarm which is | ||||||
| 2047 | * cleared after successful authentication. A limit of zero | ||||||
| 2048 | * indicates no limit. Note that we don't set the alarm in debugging | ||||||
| 2049 | * mode; it is just annoying to have the server exit just when you | ||||||
| 2050 | * are about to discover the bug. | ||||||
| 2051 | */ | ||||||
| 2052 | ssh_signal(SIGALRM14, grace_alarm_handler); | ||||||
| 2053 | if (!debug_flag
| ||||||
| 2054 | alarm(options.login_grace_time); | ||||||
| 2055 | |||||||
| 2056 | if ((r = kex_exchange_identification(ssh, -1, | ||||||
| 2057 | options.version_addendum)) != 0) | ||||||
| 2058 | sshpkt_fatal(ssh, r, "banner exchange"); | ||||||
| 2059 | |||||||
| 2060 | ssh_packet_set_nonblocking(ssh); | ||||||
| 2061 | |||||||
| 2062 | /* allocate authentication context */ | ||||||
| 2063 | authctxt = xcalloc(1, sizeof(*authctxt)); | ||||||
| 2064 | ssh->authctxt = authctxt; | ||||||
| 2065 | |||||||
| 2066 | /* XXX global for cleanup, access from other modules */ | ||||||
| 2067 | the_authctxt = authctxt; | ||||||
| 2068 | |||||||
| 2069 | /* Set default key authentication options */ | ||||||
| 2070 | if ((auth_opts = sshauthopt_new_with_keys_defaults()) == NULL((void*)0)) | ||||||
| 2071 | fatal("allocation failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2071 , 0, SYSLOG_LEVEL_FATAL, ((void*)0), "allocation failed"); | ||||||
| 2072 | |||||||
| 2073 | /* prepare buffer to collect messages to display to user after login */ | ||||||
| 2074 | if ((loginmsg = sshbuf_new()) == NULL((void*)0)) | ||||||
| 2075 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2075 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new failed"); | ||||||
| 2076 | auth_debug_reset(); | ||||||
| 2077 | |||||||
| 2078 | if (use_privsep
| ||||||
| 2079 | if (privsep_preauth(ssh) == 1) | ||||||
| 2080 | goto authenticated; | ||||||
| 2081 | } else if (have_agent) { | ||||||
| 2082 | if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) { | ||||||
| 2083 | error_r(r, "Unable to get agent socket")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2083, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Unable to get agent socket" ); | ||||||
| 2084 | have_agent = 0; | ||||||
| 2085 | } | ||||||
| 2086 | } | ||||||
| 2087 | |||||||
| 2088 | /* perform the key exchange */ | ||||||
| 2089 | /* authenticate user and start session */ | ||||||
| 2090 | do_ssh2_kex(ssh); | ||||||
| 2091 | do_authentication2(ssh); | ||||||
| 2092 | |||||||
| 2093 | /* | ||||||
| 2094 | * If we use privilege separation, the unprivileged child transfers | ||||||
| 2095 | * the current keystate and exits | ||||||
| 2096 | */ | ||||||
| 2097 | if (use_privsep) { | ||||||
| 2098 | mm_send_keystate(ssh, pmonitor); | ||||||
| 2099 | ssh_packet_clear_keys(ssh); | ||||||
| 2100 | exit(0); | ||||||
| 2101 | } | ||||||
| 2102 | |||||||
| 2103 | authenticated: | ||||||
| 2104 | /* | ||||||
| 2105 | * Cancel the alarm we set to limit the time taken for | ||||||
| 2106 | * authentication. | ||||||
| 2107 | */ | ||||||
| 2108 | alarm(0); | ||||||
| 2109 | ssh_signal(SIGALRM14, SIG_DFL(void (*)(int))0); | ||||||
| 2110 | authctxt->authenticated = 1; | ||||||
| 2111 | if (startup_pipe != -1) { | ||||||
| 2112 | close(startup_pipe); | ||||||
| 2113 | startup_pipe = -1; | ||||||
| 2114 | } | ||||||
| 2115 | |||||||
| 2116 | if (options.routing_domain != NULL((void*)0)) | ||||||
| 2117 | set_process_rdomain(ssh, options.routing_domain); | ||||||
| 2118 | |||||||
| 2119 | /* | ||||||
| 2120 | * In privilege separation, we fork another child and prepare | ||||||
| 2121 | * file descriptor passing. | ||||||
| 2122 | */ | ||||||
| 2123 | if (use_privsep
| ||||||
| 2124 | privsep_postauth(ssh, authctxt); | ||||||
| 2125 | /* the monitor process [priv] will not return */ | ||||||
| 2126 | } | ||||||
| 2127 | |||||||
| 2128 | ssh_packet_set_timeout(ssh, options.client_alive_interval, | ||||||
| 2129 | options.client_alive_count_max); | ||||||
| 2130 | |||||||
| 2131 | /* Try to send all our hostkeys to the client */ | ||||||
| 2132 | notify_hostkeys(ssh); | ||||||
| 2133 | |||||||
| 2134 | /* Start session. */ | ||||||
| 2135 | do_authenticated(ssh, authctxt); | ||||||
| 2136 | |||||||
| 2137 | /* The connection has been terminated. */ | ||||||
| 2138 | ssh_packet_get_bytes(ssh, &ibytes, &obytes); | ||||||
| 2139 | verbose("Transferred: sent %llu, received %llu bytes",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2140, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Transferred: sent %llu, received %llu bytes" , (unsigned long long)obytes, (unsigned long long)ibytes) | ||||||
| 2140 | (unsigned long long)obytes, (unsigned long long)ibytes)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2140, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Transferred: sent %llu, received %llu bytes" , (unsigned long long)obytes, (unsigned long long)ibytes); | ||||||
| 2141 | |||||||
| 2142 | verbose("Closing connection to %.500s port %d", remote_ip, remote_port)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2142, 0, SYSLOG_LEVEL_VERBOSE, ((void*)0), "Closing connection to %.500s port %d" , remote_ip, remote_port); | ||||||
| 2143 | ssh_packet_close(ssh); | ||||||
| 2144 | |||||||
| 2145 | if (use_privsep) | ||||||
| 2146 | mm_terminate(); | ||||||
| 2147 | |||||||
| 2148 | exit(0); | ||||||
| 2149 | } | ||||||
| 2150 | |||||||
| 2151 | int | ||||||
| 2152 | sshd_hostkey_sign(struct ssh *ssh, struct sshkey *privkey, | ||||||
| 2153 | struct sshkey *pubkey, u_char **signature, size_t *slenp, | ||||||
| 2154 | const u_char *data, size_t dlen, const char *alg) | ||||||
| 2155 | { | ||||||
| 2156 | int r; | ||||||
| 2157 | |||||||
| 2158 | if (use_privsep) { | ||||||
| 2159 | if (privkey) { | ||||||
| 2160 | if (mm_sshkey_sign(ssh, privkey, signature, slenp, | ||||||
| 2161 | data, dlen, alg, options.sk_provider, NULL((void*)0), | ||||||
| 2162 | ssh->compat) < 0) | ||||||
| 2163 | fatal_f("privkey sign failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2163 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "privkey sign failed"); | ||||||
| 2164 | } else { | ||||||
| 2165 | if (mm_sshkey_sign(ssh, pubkey, signature, slenp, | ||||||
| 2166 | data, dlen, alg, options.sk_provider, NULL((void*)0), | ||||||
| 2167 | ssh->compat) < 0) | ||||||
| 2168 | fatal_f("pubkey sign failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2168 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "pubkey sign failed"); | ||||||
| 2169 | } | ||||||
| 2170 | } else { | ||||||
| 2171 | if (privkey) { | ||||||
| 2172 | if (sshkey_sign(privkey, signature, slenp, data, dlen, | ||||||
| 2173 | alg, options.sk_provider, NULL((void*)0), ssh->compat) < 0) | ||||||
| 2174 | fatal_f("privkey sign failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2174 , 1, SYSLOG_LEVEL_FATAL, ((void*)0), "privkey sign failed"); | ||||||
| 2175 | } else { | ||||||
| 2176 | if ((r = ssh_agent_sign(auth_sock, pubkey, | ||||||
| 2177 | signature, slenp, data, dlen, alg, | ||||||
| 2178 | ssh->compat)) != 0) { | ||||||
| 2179 | fatal_fr(r, "agent sign failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2179 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "agent sign failed"); | ||||||
| 2180 | } | ||||||
| 2181 | } | ||||||
| 2182 | } | ||||||
| 2183 | return 0; | ||||||
| 2184 | } | ||||||
| 2185 | |||||||
| 2186 | /* SSH2 key exchange */ | ||||||
| 2187 | static void | ||||||
| 2188 | do_ssh2_kex(struct ssh *ssh) | ||||||
| 2189 | { | ||||||
| 2190 | char *myproposal[PROPOSAL_MAX] = { KEX_SERVER"curve25519-sha256," "curve25519-sha256@libssh.org," "ecdh-sha2-nistp256," "ecdh-sha2-nistp384," "ecdh-sha2-nistp521," "sntrup761x25519-sha512@openssh.com," "diffie-hellman-group-exchange-sha256," "diffie-hellman-group16-sha512," "diffie-hellman-group18-sha512," "diffie-hellman-group14-sha256" , "ssh-ed25519-cert-v01@openssh.com," "ecdsa-sha2-nistp256-cert-v01@openssh.com," "ecdsa-sha2-nistp384-cert-v01@openssh.com," "ecdsa-sha2-nistp521-cert-v01@openssh.com," "sk-ssh-ed25519-cert-v01@openssh.com," "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com," "rsa-sha2-512-cert-v01@openssh.com," "rsa-sha2-256-cert-v01@openssh.com," "ssh-ed25519," "ecdsa-sha2-nistp256," "ecdsa-sha2-nistp384," "ecdsa-sha2-nistp521," "sk-ssh-ed25519@openssh.com," "sk-ecdsa-sha2-nistp256@openssh.com," "rsa-sha2-512," "rsa-sha2-256", "chacha20-poly1305@openssh.com," "aes128-ctr,aes192-ctr,aes256-ctr," "aes128-gcm@openssh.com,aes256-gcm@openssh.com" , "chacha20-poly1305@openssh.com," "aes128-ctr,aes192-ctr,aes256-ctr," "aes128-gcm@openssh.com,aes256-gcm@openssh.com", "umac-64-etm@openssh.com," "umac-128-etm@openssh.com," "hmac-sha2-256-etm@openssh.com," "hmac-sha2-512-etm@openssh.com," "hmac-sha1-etm@openssh.com," "umac-64@openssh.com," "umac-128@openssh.com," "hmac-sha2-256," "hmac-sha2-512," "hmac-sha1", "umac-64-etm@openssh.com," "umac-128-etm@openssh.com," "hmac-sha2-256-etm@openssh.com," "hmac-sha2-512-etm@openssh.com," "hmac-sha1-etm@openssh.com," "umac-64@openssh.com," "umac-128@openssh.com," "hmac-sha2-256," "hmac-sha2-512," "hmac-sha1", "none,zlib@openssh.com" , "none,zlib@openssh.com", "", "" }; | ||||||
| 2191 | struct kex *kex; | ||||||
| 2192 | int r; | ||||||
| 2193 | |||||||
| 2194 | myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(ssh, | ||||||
| 2195 | options.kex_algorithms); | ||||||
| 2196 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = compat_cipher_proposal(ssh, | ||||||
| 2197 | options.ciphers); | ||||||
| 2198 | myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal(ssh, | ||||||
| 2199 | options.ciphers); | ||||||
| 2200 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | ||||||
| 2201 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | ||||||
| 2202 | |||||||
| 2203 | if (options.compression == COMP_NONE0) { | ||||||
| 2204 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | ||||||
| 2205 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; | ||||||
| 2206 | } | ||||||
| 2207 | |||||||
| 2208 | if (options.rekey_limit || options.rekey_interval) | ||||||
| 2209 | ssh_packet_set_rekey_limits(ssh, options.rekey_limit, | ||||||
| 2210 | options.rekey_interval); | ||||||
| 2211 | |||||||
| 2212 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal( | ||||||
| 2213 | ssh, list_hostkey_types()); | ||||||
| 2214 | |||||||
| 2215 | /* start key exchange */ | ||||||
| 2216 | if ((r = kex_setup(ssh, myproposal)) != 0) | ||||||
| 2217 | fatal_r(r, "kex_setup")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2217 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "kex_setup"); | ||||||
| 2218 | kex = ssh->kex; | ||||||
| 2219 | #ifdef WITH_OPENSSL1 | ||||||
| 2220 | kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_server; | ||||||
| 2221 | kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_server; | ||||||
| 2222 | kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_server; | ||||||
| 2223 | kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_server; | ||||||
| 2224 | kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_server; | ||||||
| 2225 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; | ||||||
| 2226 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; | ||||||
| 2227 | kex->kex[KEX_ECDH_SHA2] = kex_gen_server; | ||||||
| 2228 | #endif | ||||||
| 2229 | kex->kex[KEX_C25519_SHA256] = kex_gen_server; | ||||||
| 2230 | kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_server; | ||||||
| 2231 | kex->load_host_public_key=&get_hostkey_public_by_type; | ||||||
| 2232 | kex->load_host_private_key=&get_hostkey_private_by_type; | ||||||
| 2233 | kex->host_key_index=&get_hostkey_index; | ||||||
| 2234 | kex->sign = sshd_hostkey_sign; | ||||||
| 2235 | |||||||
| 2236 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &kex->done); | ||||||
| 2237 | |||||||
| 2238 | #ifdef DEBUG_KEXDH | ||||||
| 2239 | /* send 1st encrypted/maced/compressed message */ | ||||||
| 2240 | if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE2)) != 0 || | ||||||
| 2241 | (r = sshpkt_put_cstring(ssh, "markus")) != 0 || | ||||||
| 2242 | (r = sshpkt_send(ssh)) != 0 || | ||||||
| 2243 | (r = ssh_packet_write_wait(ssh)) != 0) | ||||||
| 2244 | fatal_fr(r, "send test")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2244 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send test"); | ||||||
| 2245 | #endif | ||||||
| 2246 | debug("KEX done")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2246, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "KEX done"); | ||||||
| 2247 | } | ||||||
| 2248 | |||||||
| 2249 | /* server specific fatal cleanup */ | ||||||
| 2250 | void | ||||||
| 2251 | cleanup_exit(int i) | ||||||
| 2252 | { | ||||||
| 2253 | if (the_active_state != NULL((void*)0) && the_authctxt != NULL((void*)0)) { | ||||||
| 2254 | do_cleanup(the_active_state, the_authctxt); | ||||||
| 2255 | if (use_privsep && privsep_is_preauth && | ||||||
| 2256 | pmonitor != NULL((void*)0) && pmonitor->m_pid > 1) { | ||||||
| 2257 | debug("Killing privsep child %d", pmonitor->m_pid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2257, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Killing privsep child %d" , pmonitor->m_pid); | ||||||
| 2258 | if (kill(pmonitor->m_pid, SIGKILL9) != 0 && | ||||||
| 2259 | errno(*__errno()) != ESRCH3) { | ||||||
| 2260 | error_f("kill(%d): %s", pmonitor->m_pid,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2261, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "kill(%d): %s", pmonitor-> m_pid, strerror((*__errno()))) | ||||||
| 2261 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2261, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "kill(%d): %s", pmonitor-> m_pid, strerror((*__errno()))); | ||||||
| 2262 | } | ||||||
| 2263 | } | ||||||
| 2264 | } | ||||||
| 2265 | _exit(i); | ||||||
| 2266 | } |