| File: | src/usr.bin/ssh/sshd/../sshd.c |
| Warning: | line 1261, column 5 Value stored to 'pid' is never read |
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| 1 | /* $OpenBSD: sshd.c,v 1.602 2024/01/08 00:34:34 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 "authfile.h" |
| 89 | #include "pathnames.h" |
| 90 | #include "atomicio.h" |
| 91 | #include "canohost.h" |
| 92 | #include "hostfile.h" |
| 93 | #include "auth.h" |
| 94 | #include "authfd.h" |
| 95 | #include "msg.h" |
| 96 | #include "dispatch.h" |
| 97 | #include "channels.h" |
| 98 | #include "session.h" |
| 99 | #include "monitor.h" |
| 100 | #ifdef GSSAPI |
| 101 | #include "ssh-gss.h" |
| 102 | #endif |
| 103 | #include "monitor_wrap.h" |
| 104 | #include "ssh-sandbox.h" |
| 105 | #include "auth-options.h" |
| 106 | #include "version.h" |
| 107 | #include "ssherr.h" |
| 108 | #include "sk-api.h" |
| 109 | #include "srclimit.h" |
| 110 | #include "dh.h" |
| 111 | |
| 112 | /* Re-exec fds */ |
| 113 | #define REEXEC_DEVCRYPTO_RESERVED_FD(2 + 1) (STDERR_FILENO2 + 1) |
| 114 | #define REEXEC_STARTUP_PIPE_FD(2 + 2) (STDERR_FILENO2 + 2) |
| 115 | #define REEXEC_CONFIG_PASS_FD(2 + 3) (STDERR_FILENO2 + 3) |
| 116 | #define REEXEC_MIN_FREE_FD(2 + 4) (STDERR_FILENO2 + 4) |
| 117 | |
| 118 | extern char *__progname; |
| 119 | |
| 120 | /* Server configuration options. */ |
| 121 | ServerOptions options; |
| 122 | |
| 123 | /* Name of the server configuration file. */ |
| 124 | char *config_file_name = _PATH_SERVER_CONFIG_FILE"/etc" "/ssh" "/sshd_config"; |
| 125 | |
| 126 | /* |
| 127 | * Debug mode flag. This can be set on the command line. If debug |
| 128 | * mode is enabled, extra debugging output will be sent to the system |
| 129 | * log, the daemon will not go to background, and will exit after processing |
| 130 | * the first connection. |
| 131 | */ |
| 132 | int debug_flag = 0; |
| 133 | |
| 134 | /* |
| 135 | * Indicating that the daemon should only test the configuration and keys. |
| 136 | * If test_flag > 1 ("-T" flag), then sshd will also dump the effective |
| 137 | * configuration, optionally using connection information provided by the |
| 138 | * "-C" flag. |
| 139 | */ |
| 140 | static int test_flag = 0; |
| 141 | |
| 142 | /* Flag indicating that the daemon is being started from inetd. */ |
| 143 | static int inetd_flag = 0; |
| 144 | |
| 145 | /* Flag indicating that sshd should not detach and become a daemon. */ |
| 146 | static int no_daemon_flag = 0; |
| 147 | |
| 148 | /* debug goes to stderr unless inetd_flag is set */ |
| 149 | static int log_stderr = 0; |
| 150 | |
| 151 | /* Saved arguments to main(). */ |
| 152 | static char **saved_argv; |
| 153 | |
| 154 | /* re-exec */ |
| 155 | static int rexeced_flag = 0; |
| 156 | static int rexec_flag = 1; |
| 157 | static int rexec_argc = 0; |
| 158 | static char **rexec_argv; |
| 159 | |
| 160 | /* |
| 161 | * The sockets that the server is listening; this is used in the SIGHUP |
| 162 | * signal handler. |
| 163 | */ |
| 164 | #define MAX_LISTEN_SOCKS16 16 |
| 165 | static int listen_socks[MAX_LISTEN_SOCKS16]; |
| 166 | static int num_listen_socks = 0; |
| 167 | |
| 168 | /* Daemon's agent connection */ |
| 169 | int auth_sock = -1; |
| 170 | static int have_agent = 0; |
| 171 | |
| 172 | /* |
| 173 | * Any really sensitive data in the application is contained in this |
| 174 | * structure. The idea is that this structure could be locked into memory so |
| 175 | * that the pages do not get written into swap. However, there are some |
| 176 | * problems. The private key contains BIGNUMs, and we do not (in principle) |
| 177 | * have access to the internals of them, and locking just the structure is |
| 178 | * not very useful. Currently, memory locking is not implemented. |
| 179 | */ |
| 180 | struct { |
| 181 | struct sshkey **host_keys; /* all private host keys */ |
| 182 | struct sshkey **host_pubkeys; /* all public host keys */ |
| 183 | struct sshkey **host_certificates; /* all public host certificates */ |
| 184 | int have_ssh2_key; |
| 185 | } sensitive_data; |
| 186 | |
| 187 | /* This is set to true when a signal is received. */ |
| 188 | static volatile sig_atomic_t received_sighup = 0; |
| 189 | static volatile sig_atomic_t received_sigterm = 0; |
| 190 | |
| 191 | /* record remote hostname or ip */ |
| 192 | u_int utmp_len = HOST_NAME_MAX255+1; |
| 193 | |
| 194 | /* |
| 195 | * startup_pipes/flags are used for tracking children of the listening sshd |
| 196 | * process early in their lifespans. This tracking is needed for three things: |
| 197 | * |
| 198 | * 1) Implementing the MaxStartups limit of concurrent unauthenticated |
| 199 | * connections. |
| 200 | * 2) Avoiding a race condition for SIGHUP processing, where child processes |
| 201 | * may have listen_socks open that could collide with main listener process |
| 202 | * after it restarts. |
| 203 | * 3) Ensuring that rexec'd sshd processes have received their initial state |
| 204 | * from the parent listen process before handling SIGHUP. |
| 205 | * |
| 206 | * Child processes signal that they have completed closure of the listen_socks |
| 207 | * and (if applicable) received their rexec state by sending a char over their |
| 208 | * sock. Child processes signal that authentication has completed by closing |
| 209 | * the sock (or by exiting). |
| 210 | */ |
| 211 | static int *startup_pipes = NULL((void *)0); |
| 212 | static int *startup_flags = NULL((void *)0); /* Indicates child closed listener */ |
| 213 | static int startup_pipe = -1; /* in child */ |
| 214 | |
| 215 | /* variables used for privilege separation */ |
| 216 | int use_privsep = -1; |
| 217 | struct monitor *pmonitor = NULL((void *)0); |
| 218 | int privsep_is_preauth = 1; |
| 219 | |
| 220 | /* global connection state and authentication contexts */ |
| 221 | Authctxt *the_authctxt = NULL((void *)0); |
| 222 | struct ssh *the_active_state; |
| 223 | |
| 224 | /* global key/cert auth options. XXX move to permanent ssh->authctxt? */ |
| 225 | struct sshauthopt *auth_opts = NULL((void *)0); |
| 226 | |
| 227 | /* sshd_config buffer */ |
| 228 | struct sshbuf *cfg; |
| 229 | |
| 230 | /* Included files from the configuration file */ |
| 231 | struct include_list includes = TAILQ_HEAD_INITIALIZER(includes){ ((void *)0), &(includes).tqh_first }; |
| 232 | |
| 233 | /* message to be displayed after login */ |
| 234 | struct sshbuf *loginmsg; |
| 235 | |
| 236 | /* Prototypes for various functions defined later in this file. */ |
| 237 | void destroy_sensitive_data(void); |
| 238 | void demote_sensitive_data(void); |
| 239 | static void do_ssh2_kex(struct ssh *); |
| 240 | |
| 241 | static char *listener_proctitle; |
| 242 | |
| 243 | /* |
| 244 | * Close all listening sockets |
| 245 | */ |
| 246 | static void |
| 247 | close_listen_socks(void) |
| 248 | { |
| 249 | int i; |
| 250 | |
| 251 | for (i = 0; i < num_listen_socks; i++) |
| 252 | close(listen_socks[i]); |
| 253 | num_listen_socks = 0; |
| 254 | } |
| 255 | |
| 256 | static void |
| 257 | close_startup_pipes(void) |
| 258 | { |
| 259 | int i; |
| 260 | |
| 261 | if (startup_pipes) |
| 262 | for (i = 0; i < options.max_startups; i++) |
| 263 | if (startup_pipes[i] != -1) |
| 264 | close(startup_pipes[i]); |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP; |
| 269 | * the effect is to reread the configuration file (and to regenerate |
| 270 | * the server key). |
| 271 | */ |
| 272 | |
| 273 | static void |
| 274 | sighup_handler(int sig) |
| 275 | { |
| 276 | received_sighup = 1; |
| 277 | } |
| 278 | |
| 279 | /* |
| 280 | * Called from the main program after receiving SIGHUP. |
| 281 | * Restarts the server. |
| 282 | */ |
| 283 | static void |
| 284 | sighup_restart(void) |
| 285 | { |
| 286 | logit("Received SIGHUP; restarting.")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 286, 0 , SYSLOG_LEVEL_INFO, ((void *)0), "Received SIGHUP; restarting." ); |
| 287 | if (options.pid_file != NULL((void *)0)) |
| 288 | unlink(options.pid_file); |
| 289 | close_listen_socks(); |
| 290 | close_startup_pipes(); |
| 291 | ssh_signal(SIGHUP1, SIG_IGN(void (*)(int))1); /* will be restored after exec */ |
| 292 | execv(saved_argv[0], saved_argv); |
| 293 | logit("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0],sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 294, 0 , SYSLOG_LEVEL_INFO, ((void *)0), "RESTART FAILED: av[0]='%.100s', error: %.100s." , saved_argv[0], strerror((*__errno()))) |
| 294 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 294, 0 , SYSLOG_LEVEL_INFO, ((void *)0), "RESTART FAILED: av[0]='%.100s', error: %.100s." , saved_argv[0], strerror((*__errno()))); |
| 295 | exit(1); |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * Generic signal handler for terminating signals in the master daemon. |
| 300 | */ |
| 301 | static void |
| 302 | sigterm_handler(int sig) |
| 303 | { |
| 304 | received_sigterm = sig; |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * SIGCHLD handler. This is called whenever a child dies. This will then |
| 309 | * reap any zombies left by exited children. |
| 310 | */ |
| 311 | static void |
| 312 | main_sigchld_handler(int sig) |
| 313 | { |
| 314 | int save_errno = errno(*__errno()); |
| 315 | pid_t pid; |
| 316 | int status; |
| 317 | |
| 318 | while ((pid = waitpid(-1, &status, WNOHANG0x01)) > 0 || |
| 319 | (pid == -1 && errno(*__errno()) == EINTR4)) |
| 320 | ; |
| 321 | errno(*__errno()) = save_errno; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Signal handler for the alarm after the login grace period has expired. |
| 326 | */ |
| 327 | static void |
| 328 | grace_alarm_handler(int sig) |
| 329 | { |
| 330 | /* |
| 331 | * Try to kill any processes that we have spawned, E.g. authorized |
| 332 | * keys command helpers or privsep children. |
| 333 | */ |
| 334 | if (getpgid(0) == getpid()) { |
| 335 | ssh_signal(SIGTERM15, SIG_IGN(void (*)(int))1); |
| 336 | kill(0, SIGTERM15); |
| 337 | } |
| 338 | |
| 339 | /* Log error and exit. */ |
| 340 | sigdie("Timeout before authentication for %s port %d",sshsigdie("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 342 , 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 )) |
| 341 | ssh_remote_ipaddr(the_active_state),sshsigdie("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 342 , 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 )) |
| 342 | ssh_remote_port(the_active_state))sshsigdie("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 342 , 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 )); |
| 343 | } |
| 344 | |
| 345 | /* Destroy the host and server keys. They will no longer be needed. */ |
| 346 | void |
| 347 | destroy_sensitive_data(void) |
| 348 | { |
| 349 | u_int i; |
| 350 | |
| 351 | for (i = 0; i < options.num_host_key_files; i++) { |
| 352 | if (sensitive_data.host_keys[i]) { |
| 353 | sshkey_free(sensitive_data.host_keys[i]); |
| 354 | sensitive_data.host_keys[i] = NULL((void *)0); |
| 355 | } |
| 356 | if (sensitive_data.host_certificates[i]) { |
| 357 | sshkey_free(sensitive_data.host_certificates[i]); |
| 358 | sensitive_data.host_certificates[i] = NULL((void *)0); |
| 359 | } |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | /* Demote private to public keys for network child */ |
| 364 | void |
| 365 | demote_sensitive_data(void) |
| 366 | { |
| 367 | struct sshkey *tmp; |
| 368 | u_int i; |
| 369 | int r; |
| 370 | |
| 371 | for (i = 0; i < options.num_host_key_files; i++) { |
| 372 | if (sensitive_data.host_keys[i]) { |
| 373 | if ((r = sshkey_from_private( |
| 374 | sensitive_data.host_keys[i], &tmp)) != 0) |
| 375 | fatal_r(r, "could not demote host %s key",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 376 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "could not demote host %s key" , sshkey_type(sensitive_data.host_keys[i])) |
| 376 | sshkey_type(sensitive_data.host_keys[i]))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 376 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "could not demote host %s key" , sshkey_type(sensitive_data.host_keys[i])); |
| 377 | sshkey_free(sensitive_data.host_keys[i]); |
| 378 | sensitive_data.host_keys[i] = tmp; |
| 379 | } |
| 380 | /* Certs do not need demotion */ |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | static void |
| 385 | privsep_preauth_child(void) |
| 386 | { |
| 387 | gid_t gidset[1]; |
| 388 | struct passwd *pw; |
| 389 | |
| 390 | /* Enable challenge-response authentication for privilege separation */ |
| 391 | privsep_challenge_enable(); |
| 392 | |
| 393 | #ifdef GSSAPI |
| 394 | /* Cache supported mechanism OIDs for later use */ |
| 395 | ssh_gssapi_prepare_supported_oids(); |
| 396 | #endif |
| 397 | |
| 398 | /* Demote the private keys to public keys. */ |
| 399 | demote_sensitive_data(); |
| 400 | |
| 401 | /* Demote the child */ |
| 402 | if (getuid() == 0 || geteuid() == 0) { |
| 403 | if ((pw = getpwnam(SSH_PRIVSEP_USER"sshd")) == NULL((void *)0)) |
| 404 | fatal("Privilege separation user %s does not exist",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 405 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Privilege separation user %s does not exist" , "sshd") |
| 405 | SSH_PRIVSEP_USER)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 405 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Privilege separation user %s does not exist" , "sshd"); |
| 406 | pw = pwcopy(pw); /* Ensure mutable */ |
| 407 | endpwent(); |
| 408 | freezero(pw->pw_passwd, strlen(pw->pw_passwd)); |
| 409 | |
| 410 | /* Change our root directory */ |
| 411 | if (chroot(_PATH_PRIVSEP_CHROOT_DIR"/var/empty") == -1) |
| 412 | fatal("chroot(\"%s\"): %s", _PATH_PRIVSEP_CHROOT_DIR,sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 413 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "chroot(\"%s\"): %s", "/var/empty" , strerror((*__errno()))) |
| 413 | strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 413 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "chroot(\"%s\"): %s", "/var/empty" , strerror((*__errno()))); |
| 414 | if (chdir("/") == -1) |
| 415 | fatal("chdir(\"/\"): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 415 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "chdir(\"/\"): %s", strerror ((*__errno()))); |
| 416 | |
| 417 | /* |
| 418 | * Drop our privileges |
| 419 | * NB. Can't use setusercontext() after chroot. |
| 420 | */ |
| 421 | debug3("privsep user:group %u:%u", (u_int)pw->pw_uid,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 422, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "privsep user:group %u:%u" , (u_int)pw->pw_uid, (u_int)pw->pw_gid) |
| 422 | (u_int)pw->pw_gid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 422, 0 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "privsep user:group %u:%u" , (u_int)pw->pw_uid, (u_int)pw->pw_gid); |
| 423 | gidset[0] = pw->pw_gid; |
| 424 | if (setgroups(1, gidset) == -1) |
| 425 | fatal("setgroups: %.100s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 425 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "setgroups: %.100s", strerror ((*__errno()))); |
| 426 | permanently_set_uid(pw); |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | static int |
| 431 | privsep_preauth(struct ssh *ssh) |
| 432 | { |
| 433 | int status, r; |
| 434 | pid_t pid; |
| 435 | struct ssh_sandbox *box = NULL((void *)0); |
| 436 | |
| 437 | /* Set up unprivileged child process to deal with network data */ |
| 438 | pmonitor = monitor_init(); |
| 439 | /* Store a pointer to the kex for later rekeying */ |
| 440 | pmonitor->m_pkex = &ssh->kex; |
| 441 | |
| 442 | if (use_privsep == PRIVSEP_ON1) |
| 443 | box = ssh_sandbox_init(); |
| 444 | pid = fork(); |
| 445 | if (pid == -1) { |
| 446 | fatal("fork of unprivileged child failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 446 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "fork of unprivileged child failed" ); |
| 447 | } else if (pid != 0) { |
| 448 | debug2("Network child is on pid %ld", (long)pid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 448, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "Network child is on pid %ld" , (long)pid); |
| 449 | |
| 450 | pmonitor->m_pid = pid; |
| 451 | if (have_agent) { |
| 452 | r = ssh_get_authentication_socket(&auth_sock); |
| 453 | if (r != 0) { |
| 454 | error_r(r, "Could not get agent socket")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 454, 0 , SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not get agent socket" ); |
| 455 | have_agent = 0; |
| 456 | } |
| 457 | } |
| 458 | if (box != NULL((void *)0)) |
| 459 | ssh_sandbox_parent_preauth(box, pid); |
| 460 | monitor_child_preauth(ssh, pmonitor); |
| 461 | |
| 462 | /* Wait for the child's exit status */ |
| 463 | while (waitpid(pid, &status, 0) == -1) { |
| 464 | if (errno(*__errno()) == EINTR4) |
| 465 | continue; |
| 466 | pmonitor->m_pid = -1; |
| 467 | fatal_f("waitpid: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 467 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "waitpid: %s", strerror ((*__errno()))); |
| 468 | } |
| 469 | privsep_is_preauth = 0; |
| 470 | pmonitor->m_pid = -1; |
| 471 | if (WIFEXITED(status)(((status) & 0177) == 0)) { |
| 472 | if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) != 0) |
| 473 | fatal_f("preauth child exited with status %d",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 474 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "preauth child exited with status %d" , (int)(((unsigned)(status) >> 8) & 0xff)) |
| 474 | WEXITSTATUS(status))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 474 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "preauth child exited with status %d" , (int)(((unsigned)(status) >> 8) & 0xff)); |
| 475 | } else if (WIFSIGNALED(status)(((status) & 0177) != 0177 && ((status) & 0177 ) != 0)) |
| 476 | fatal_f("preauth child terminated by signal %d",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 477 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "preauth child terminated by signal %d" , (((status) & 0177))) |
| 477 | WTERMSIG(status))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 477 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "preauth child terminated by signal %d" , (((status) & 0177))); |
| 478 | if (box != NULL((void *)0)) |
| 479 | ssh_sandbox_parent_finish(box); |
| 480 | return 1; |
| 481 | } else { |
| 482 | /* child */ |
| 483 | close(pmonitor->m_sendfd); |
| 484 | close(pmonitor->m_log_recvfd); |
| 485 | |
| 486 | /* Arrange for logging to be sent to the monitor */ |
| 487 | set_log_handler(mm_log_handler, pmonitor); |
| 488 | |
| 489 | privsep_preauth_child(); |
| 490 | setproctitle("%s", "[net]"); |
| 491 | if (box != NULL((void *)0)) |
| 492 | ssh_sandbox_child(box); |
| 493 | |
| 494 | return 0; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | static void |
| 499 | privsep_postauth(struct ssh *ssh, Authctxt *authctxt) |
| 500 | { |
| 501 | if (authctxt->pw->pw_uid == 0) { |
| 502 | /* File descriptor passing is broken or root login */ |
| 503 | use_privsep = 0; |
| 504 | goto skip; |
| 505 | } |
| 506 | |
| 507 | /* New socket pair */ |
| 508 | monitor_reinit(pmonitor); |
| 509 | |
| 510 | pmonitor->m_pid = fork(); |
| 511 | if (pmonitor->m_pid == -1) |
| 512 | fatal("fork of unprivileged child failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 512 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "fork of unprivileged child failed" ); |
| 513 | else if (pmonitor->m_pid != 0) { |
| 514 | verbose("User child is on pid %ld", (long)pmonitor->m_pid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 514, 0 , SYSLOG_LEVEL_VERBOSE, ((void *)0), "User child is on pid %ld" , (long)pmonitor->m_pid); |
| 515 | sshbuf_reset(loginmsg); |
| 516 | monitor_clear_keystate(ssh, pmonitor); |
| 517 | monitor_child_postauth(ssh, pmonitor); |
| 518 | |
| 519 | /* NEVERREACHED */ |
| 520 | exit(0); |
| 521 | } |
| 522 | |
| 523 | /* child */ |
| 524 | |
| 525 | close(pmonitor->m_sendfd); |
| 526 | pmonitor->m_sendfd = -1; |
| 527 | |
| 528 | /* Demote the private keys to public keys. */ |
| 529 | demote_sensitive_data(); |
| 530 | |
| 531 | /* Drop privileges */ |
| 532 | do_setusercontext(authctxt->pw); |
| 533 | |
| 534 | skip: |
| 535 | /* It is safe now to apply the key state */ |
| 536 | monitor_apply_keystate(ssh, pmonitor); |
| 537 | |
| 538 | /* |
| 539 | * Tell the packet layer that authentication was successful, since |
| 540 | * this information is not part of the key state. |
| 541 | */ |
| 542 | ssh_packet_set_authenticated(ssh); |
| 543 | } |
| 544 | |
| 545 | static void |
| 546 | append_hostkey_type(struct sshbuf *b, const char *s) |
| 547 | { |
| 548 | int r; |
| 549 | |
| 550 | if (match_pattern_list(s, options.hostkeyalgorithms, 0) != 1) { |
| 551 | debug3_f("%s key not permitted by HostkeyAlgorithms", s)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 551, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s key not permitted by HostkeyAlgorithms" , s); |
| 552 | return; |
| 553 | } |
| 554 | if ((r = sshbuf_putf(b, "%s%s", sshbuf_len(b) > 0 ? "," : "", s)) != 0) |
| 555 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 555 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 556 | } |
| 557 | |
| 558 | static char * |
| 559 | list_hostkey_types(void) |
| 560 | { |
| 561 | struct sshbuf *b; |
| 562 | struct sshkey *key; |
| 563 | char *ret; |
| 564 | u_int i; |
| 565 | |
| 566 | if ((b = sshbuf_new()) == NULL((void *)0)) |
| 567 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 567 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
| 568 | for (i = 0; i < options.num_host_key_files; i++) { |
| 569 | key = sensitive_data.host_keys[i]; |
| 570 | if (key == NULL((void *)0)) |
| 571 | key = sensitive_data.host_pubkeys[i]; |
| 572 | if (key == NULL((void *)0)) |
| 573 | continue; |
| 574 | switch (key->type) { |
| 575 | case KEY_RSA: |
| 576 | /* for RSA we also support SHA2 signatures */ |
| 577 | append_hostkey_type(b, "rsa-sha2-512"); |
| 578 | append_hostkey_type(b, "rsa-sha2-256"); |
| 579 | /* FALLTHROUGH */ |
| 580 | case KEY_DSA: |
| 581 | case KEY_ECDSA: |
| 582 | case KEY_ED25519: |
| 583 | case KEY_ECDSA_SK: |
| 584 | case KEY_ED25519_SK: |
| 585 | case KEY_XMSS: |
| 586 | append_hostkey_type(b, sshkey_ssh_name(key)); |
| 587 | break; |
| 588 | } |
| 589 | /* If the private key has a cert peer, then list that too */ |
| 590 | key = sensitive_data.host_certificates[i]; |
| 591 | if (key == NULL((void *)0)) |
| 592 | continue; |
| 593 | switch (key->type) { |
| 594 | case KEY_RSA_CERT: |
| 595 | /* for RSA we also support SHA2 signatures */ |
| 596 | append_hostkey_type(b, |
| 597 | "rsa-sha2-512-cert-v01@openssh.com"); |
| 598 | append_hostkey_type(b, |
| 599 | "rsa-sha2-256-cert-v01@openssh.com"); |
| 600 | /* FALLTHROUGH */ |
| 601 | case KEY_DSA_CERT: |
| 602 | case KEY_ECDSA_CERT: |
| 603 | case KEY_ED25519_CERT: |
| 604 | case KEY_ECDSA_SK_CERT: |
| 605 | case KEY_ED25519_SK_CERT: |
| 606 | case KEY_XMSS_CERT: |
| 607 | append_hostkey_type(b, sshkey_ssh_name(key)); |
| 608 | break; |
| 609 | } |
| 610 | } |
| 611 | if ((ret = sshbuf_dup_string(b)) == NULL((void *)0)) |
| 612 | fatal_f("sshbuf_dup_string failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 612 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_dup_string failed" ); |
| 613 | sshbuf_free(b); |
| 614 | debug_f("%s", ret)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 614, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s", ret); |
| 615 | return ret; |
| 616 | } |
| 617 | |
| 618 | static struct sshkey * |
| 619 | get_hostkey_by_type(int type, int nid, int need_private, struct ssh *ssh) |
| 620 | { |
| 621 | u_int i; |
| 622 | struct sshkey *key; |
| 623 | |
| 624 | for (i = 0; i < options.num_host_key_files; i++) { |
| 625 | switch (type) { |
| 626 | case KEY_RSA_CERT: |
| 627 | case KEY_DSA_CERT: |
| 628 | case KEY_ECDSA_CERT: |
| 629 | case KEY_ED25519_CERT: |
| 630 | case KEY_ECDSA_SK_CERT: |
| 631 | case KEY_ED25519_SK_CERT: |
| 632 | case KEY_XMSS_CERT: |
| 633 | key = sensitive_data.host_certificates[i]; |
| 634 | break; |
| 635 | default: |
| 636 | key = sensitive_data.host_keys[i]; |
| 637 | if (key == NULL((void *)0) && !need_private) |
| 638 | key = sensitive_data.host_pubkeys[i]; |
| 639 | break; |
| 640 | } |
| 641 | if (key == NULL((void *)0) || key->type != type) |
| 642 | continue; |
| 643 | switch (type) { |
| 644 | case KEY_ECDSA: |
| 645 | case KEY_ECDSA_SK: |
| 646 | case KEY_ECDSA_CERT: |
| 647 | case KEY_ECDSA_SK_CERT: |
| 648 | if (key->ecdsa_nid != nid) |
| 649 | continue; |
| 650 | /* FALLTHROUGH */ |
| 651 | default: |
| 652 | return need_private ? |
| 653 | sensitive_data.host_keys[i] : key; |
| 654 | } |
| 655 | } |
| 656 | return NULL((void *)0); |
| 657 | } |
| 658 | |
| 659 | struct sshkey * |
| 660 | get_hostkey_public_by_type(int type, int nid, struct ssh *ssh) |
| 661 | { |
| 662 | return get_hostkey_by_type(type, nid, 0, ssh); |
| 663 | } |
| 664 | |
| 665 | struct sshkey * |
| 666 | get_hostkey_private_by_type(int type, int nid, struct ssh *ssh) |
| 667 | { |
| 668 | return get_hostkey_by_type(type, nid, 1, ssh); |
| 669 | } |
| 670 | |
| 671 | struct sshkey * |
| 672 | get_hostkey_by_index(int ind) |
| 673 | { |
| 674 | if (ind < 0 || (u_int)ind >= options.num_host_key_files) |
| 675 | return (NULL((void *)0)); |
| 676 | return (sensitive_data.host_keys[ind]); |
| 677 | } |
| 678 | |
| 679 | struct sshkey * |
| 680 | get_hostkey_public_by_index(int ind, struct ssh *ssh) |
| 681 | { |
| 682 | if (ind < 0 || (u_int)ind >= options.num_host_key_files) |
| 683 | return (NULL((void *)0)); |
| 684 | return (sensitive_data.host_pubkeys[ind]); |
| 685 | } |
| 686 | |
| 687 | int |
| 688 | get_hostkey_index(struct sshkey *key, int compare, struct ssh *ssh) |
| 689 | { |
| 690 | u_int i; |
| 691 | |
| 692 | for (i = 0; i < options.num_host_key_files; i++) { |
| 693 | if (sshkey_is_cert(key)) { |
| 694 | if (key == sensitive_data.host_certificates[i] || |
| 695 | (compare && sensitive_data.host_certificates[i] && |
| 696 | sshkey_equal(key, |
| 697 | sensitive_data.host_certificates[i]))) |
| 698 | return (i); |
| 699 | } else { |
| 700 | if (key == sensitive_data.host_keys[i] || |
| 701 | (compare && sensitive_data.host_keys[i] && |
| 702 | sshkey_equal(key, sensitive_data.host_keys[i]))) |
| 703 | return (i); |
| 704 | if (key == sensitive_data.host_pubkeys[i] || |
| 705 | (compare && sensitive_data.host_pubkeys[i] && |
| 706 | sshkey_equal(key, sensitive_data.host_pubkeys[i]))) |
| 707 | return (i); |
| 708 | } |
| 709 | } |
| 710 | return (-1); |
| 711 | } |
| 712 | |
| 713 | /* Inform the client of all hostkeys */ |
| 714 | static void |
| 715 | notify_hostkeys(struct ssh *ssh) |
| 716 | { |
| 717 | struct sshbuf *buf; |
| 718 | struct sshkey *key; |
| 719 | u_int i, nkeys; |
| 720 | int r; |
| 721 | char *fp; |
| 722 | |
| 723 | /* Some clients cannot cope with the hostkeys message, skip those. */ |
| 724 | if (ssh->compat & SSH_BUG_HOSTKEYS0x20000000) |
| 725 | return; |
| 726 | |
| 727 | if ((buf = sshbuf_new()) == NULL((void *)0)) |
| 728 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 728 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 729 | for (i = nkeys = 0; i < options.num_host_key_files; i++) { |
| 730 | key = get_hostkey_public_by_index(i, ssh); |
| 731 | if (key == NULL((void *)0) || key->type == KEY_UNSPEC || |
| 732 | sshkey_is_cert(key)) |
| 733 | continue; |
| 734 | fp = sshkey_fingerprint(key, options.fingerprint_hash, |
| 735 | SSH_FP_DEFAULT); |
| 736 | debug3_f("key %d: %s %s", i, sshkey_ssh_name(key), fp)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 736, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "key %d: %s %s", i, sshkey_ssh_name (key), fp); |
| 737 | free(fp); |
| 738 | if (nkeys == 0) { |
| 739 | /* |
| 740 | * Start building the request when we find the |
| 741 | * first usable key. |
| 742 | */ |
| 743 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST80)) != 0 || |
| 744 | (r = sshpkt_put_cstring(ssh, "hostkeys-00@openssh.com")) != 0 || |
| 745 | (r = sshpkt_put_u8(ssh, 0)) != 0) /* want reply */ |
| 746 | sshpkt_fatal(ssh, r, "%s: start request", __func__); |
| 747 | } |
| 748 | /* Append the key to the request */ |
| 749 | sshbuf_reset(buf); |
| 750 | if ((r = sshkey_putb(key, buf)) != 0) |
| 751 | fatal_fr(r, "couldn't put hostkey %d", i)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 751 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "couldn't put hostkey %d" , i); |
| 752 | if ((r = sshpkt_put_stringb(ssh, buf)) != 0) |
| 753 | sshpkt_fatal(ssh, r, "%s: append key", __func__); |
| 754 | nkeys++; |
| 755 | } |
| 756 | debug3_f("sent %u hostkeys", nkeys)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 756, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "sent %u hostkeys", nkeys ); |
| 757 | if (nkeys == 0) |
| 758 | fatal_f("no hostkeys")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 758 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "no hostkeys"); |
| 759 | if ((r = sshpkt_send(ssh)) != 0) |
| 760 | sshpkt_fatal(ssh, r, "%s: send", __func__); |
| 761 | sshbuf_free(buf); |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | * returns 1 if connection should be dropped, 0 otherwise. |
| 766 | * dropping starts at connection #max_startups_begin with a probability |
| 767 | * of (max_startups_rate/100). the probability increases linearly until |
| 768 | * all connections are dropped for startups > max_startups |
| 769 | */ |
| 770 | static int |
| 771 | should_drop_connection(int startups) |
| 772 | { |
| 773 | int p, r; |
| 774 | |
| 775 | if (startups < options.max_startups_begin) |
| 776 | return 0; |
| 777 | if (startups >= options.max_startups) |
| 778 | return 1; |
| 779 | if (options.max_startups_rate == 100) |
| 780 | return 1; |
| 781 | |
| 782 | p = 100 - options.max_startups_rate; |
| 783 | p *= startups - options.max_startups_begin; |
| 784 | p /= options.max_startups - options.max_startups_begin; |
| 785 | p += options.max_startups_rate; |
| 786 | r = arc4random_uniform(100); |
| 787 | |
| 788 | debug_f("p %d, r %d", p, r)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 788, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "p %d, r %d", p, r); |
| 789 | return (r < p) ? 1 : 0; |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * Check whether connection should be accepted by MaxStartups. |
| 794 | * Returns 0 if the connection is accepted. If the connection is refused, |
| 795 | * returns 1 and attempts to send notification to client. |
| 796 | * Logs when the MaxStartups condition is entered or exited, and periodically |
| 797 | * while in that state. |
| 798 | */ |
| 799 | static int |
| 800 | drop_connection(int sock, int startups, int notify_pipe) |
| 801 | { |
| 802 | char *laddr, *raddr; |
| 803 | const char msg[] = "Exceeded MaxStartups\r\n"; |
| 804 | static time_t last_drop, first_drop; |
| 805 | static u_int ndropped; |
| 806 | LogLevel drop_level = SYSLOG_LEVEL_VERBOSE; |
| 807 | time_t now; |
| 808 | |
| 809 | now = monotime(); |
| 810 | if (!should_drop_connection(startups) && |
| 811 | srclimit_check_allow(sock, notify_pipe) == 1) { |
| 812 | if (last_drop != 0 && |
| 813 | startups < options.max_startups_begin - 1) { |
| 814 | /* XXX maybe need better hysteresis here */ |
| 815 | logit("exited MaxStartups throttling after %s, "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 817, 0 , SYSLOG_LEVEL_INFO, ((void *)0), "exited MaxStartups throttling after %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped ) |
| 816 | "%u connections dropped",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 817, 0 , SYSLOG_LEVEL_INFO, ((void *)0), "exited MaxStartups throttling after %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped ) |
| 817 | fmt_timeframe(now - first_drop), ndropped)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 817, 0 , SYSLOG_LEVEL_INFO, ((void *)0), "exited MaxStartups throttling after %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped ); |
| 818 | last_drop = 0; |
| 819 | } |
| 820 | return 0; |
| 821 | } |
| 822 | |
| 823 | #define SSHD_MAXSTARTUPS_LOG_INTERVAL(5 * 60) (5 * 60) |
| 824 | if (last_drop == 0) { |
| 825 | error("beginning MaxStartups throttling")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 825, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "beginning MaxStartups throttling" ); |
| 826 | drop_level = SYSLOG_LEVEL_INFO; |
| 827 | first_drop = now; |
| 828 | ndropped = 0; |
| 829 | } else if (last_drop + SSHD_MAXSTARTUPS_LOG_INTERVAL(5 * 60) < now) { |
| 830 | /* Periodic logs */ |
| 831 | error("in MaxStartups throttling for %s, "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 833, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "in MaxStartups throttling for %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped + 1) |
| 832 | "%u connections dropped",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 833, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "in MaxStartups throttling for %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped + 1) |
| 833 | fmt_timeframe(now - first_drop), ndropped + 1)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 833, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "in MaxStartups throttling for %s, " "%u connections dropped", fmt_timeframe(now - first_drop), ndropped + 1); |
| 834 | drop_level = SYSLOG_LEVEL_INFO; |
| 835 | } |
| 836 | last_drop = now; |
| 837 | ndropped++; |
| 838 | |
| 839 | laddr = get_local_ipaddr(sock); |
| 840 | raddr = get_peer_ipaddr(sock); |
| 841 | do_log2(drop_level, "drop connection #%d from [%s]:%d on [%s]:%d "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 843, 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)) |
| 842 | "past MaxStartups", startups, raddr, get_peer_port(sock),sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 843, 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)) |
| 843 | laddr, get_local_port(sock))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 843, 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)); |
| 844 | free(laddr); |
| 845 | free(raddr); |
| 846 | /* best-effort notification to client */ |
| 847 | (void)write(sock, msg, sizeof(msg) - 1); |
| 848 | return 1; |
| 849 | } |
| 850 | |
| 851 | static void |
| 852 | usage(void) |
| 853 | { |
| 854 | fprintf(stderr(&__sF[2]), "%s, %s\n", SSH_VERSION"OpenSSH_9.6", SSH_OPENSSL_VERSIONOpenSSL_version(0)); |
| 855 | fprintf(stderr(&__sF[2]), |
| 856 | "usage: sshd [-46DdeGiqTtV] [-C connection_spec] [-c host_cert_file]\n" |
| 857 | " [-E log_file] [-f config_file] [-g login_grace_time]\n" |
| 858 | " [-h host_key_file] [-o option] [-p port] [-u len]\n" |
| 859 | ); |
| 860 | exit(1); |
| 861 | } |
| 862 | |
| 863 | static void |
| 864 | send_rexec_state(int fd, struct sshbuf *conf) |
| 865 | { |
| 866 | struct sshbuf *m = NULL((void *)0), *inc = NULL((void *)0); |
| 867 | struct include_item *item = NULL((void *)0); |
| 868 | int r; |
| 869 | |
| 870 | debug3_f("entering fd = %d config len %zu", fd,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 871, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering fd = %d config len %zu" , fd, sshbuf_len(conf)) |
| 871 | sshbuf_len(conf))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 871, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering fd = %d config len %zu" , fd, sshbuf_len(conf)); |
| 872 | |
| 873 | if ((m = sshbuf_new()) == NULL((void *)0) || (inc = sshbuf_new()) == NULL((void *)0)) |
| 874 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 874 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
| 875 | |
| 876 | /* pack includes into a string */ |
| 877 | TAILQ_FOREACH(item, &includes, entry)for((item) = ((&includes)->tqh_first); (item) != ((void *)0); (item) = ((item)->entry.tqe_next)) { |
| 878 | if ((r = sshbuf_put_cstring(inc, item->selector)) != 0 || |
| 879 | (r = sshbuf_put_cstring(inc, item->filename)) != 0 || |
| 880 | (r = sshbuf_put_stringb(inc, item->contents)) != 0) |
| 881 | fatal_fr(r, "compose includes")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 881 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose includes"); |
| 882 | } |
| 883 | |
| 884 | /* |
| 885 | * Protocol from reexec master to child: |
| 886 | * string configuration |
| 887 | * string included_files[] { |
| 888 | * string selector |
| 889 | * string filename |
| 890 | * string contents |
| 891 | * } |
| 892 | */ |
| 893 | if ((r = sshbuf_put_stringb(m, conf)) != 0 || |
| 894 | (r = sshbuf_put_stringb(m, inc)) != 0) |
| 895 | fatal_fr(r, "compose config")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 895 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose config"); |
| 896 | if (ssh_msg_send(fd, 0, m) == -1) |
| 897 | error_f("ssh_msg_send failed")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 897, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "ssh_msg_send failed"); |
| 898 | |
| 899 | sshbuf_free(m); |
| 900 | sshbuf_free(inc); |
| 901 | |
| 902 | debug3_f("done")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 902, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "done"); |
| 903 | } |
| 904 | |
| 905 | static void |
| 906 | recv_rexec_state(int fd, struct sshbuf *conf) |
| 907 | { |
| 908 | struct sshbuf *m, *inc; |
| 909 | u_char *cp, ver; |
| 910 | size_t len; |
| 911 | int r; |
| 912 | struct include_item *item; |
| 913 | |
| 914 | debug3_f("entering fd = %d", fd)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 914, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering fd = %d", fd); |
| 915 | |
| 916 | if ((m = sshbuf_new()) == NULL((void *)0) || (inc = sshbuf_new()) == NULL((void *)0)) |
| 917 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 917 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
| 918 | if (ssh_msg_recv(fd, m) == -1) |
| 919 | fatal_f("ssh_msg_recv failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 919 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "ssh_msg_recv failed"); |
| 920 | if ((r = sshbuf_get_u8(m, &ver)) != 0) |
| 921 | fatal_fr(r, "parse version")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 921 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse version"); |
| 922 | if (ver != 0) |
| 923 | fatal_f("rexec version mismatch")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 923 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "rexec version mismatch" ); |
| 924 | if ((r = sshbuf_get_string(m, &cp, &len)) != 0 || |
| 925 | (r = sshbuf_get_stringb(m, inc)) != 0) |
| 926 | fatal_fr(r, "parse config")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 926 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse config"); |
| 927 | |
| 928 | if (conf != NULL((void *)0) && (r = sshbuf_put(conf, cp, len))) |
| 929 | fatal_fr(r, "sshbuf_put")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 929 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put"); |
| 930 | |
| 931 | while (sshbuf_len(inc) != 0) { |
| 932 | item = xcalloc(1, sizeof(*item)); |
| 933 | if ((item->contents = sshbuf_new()) == NULL((void *)0)) |
| 934 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 934 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
| 935 | if ((r = sshbuf_get_cstring(inc, &item->selector, NULL((void *)0))) != 0 || |
| 936 | (r = sshbuf_get_cstring(inc, &item->filename, NULL((void *)0))) != 0 || |
| 937 | (r = sshbuf_get_stringb(inc, item->contents)) != 0) |
| 938 | fatal_fr(r, "parse includes")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 938 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse includes"); |
| 939 | 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); |
| 940 | } |
| 941 | |
| 942 | free(cp); |
| 943 | sshbuf_free(m); |
| 944 | |
| 945 | debug3_f("done")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 945, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "done"); |
| 946 | } |
| 947 | |
| 948 | /* Accept a connection from inetd */ |
| 949 | static void |
| 950 | server_accept_inetd(int *sock_in, int *sock_out) |
| 951 | { |
| 952 | if (rexeced_flag) { |
| 953 | close(REEXEC_CONFIG_PASS_FD(2 + 3)); |
| 954 | *sock_in = *sock_out = dup(STDIN_FILENO0); |
| 955 | } else { |
| 956 | *sock_in = dup(STDIN_FILENO0); |
| 957 | *sock_out = dup(STDOUT_FILENO1); |
| 958 | } |
| 959 | /* |
| 960 | * We intentionally do not close the descriptors 0, 1, and 2 |
| 961 | * as our code for setting the descriptors won't work if |
| 962 | * ttyfd happens to be one of those. |
| 963 | */ |
| 964 | if (stdfd_devnull(1, 1, !log_stderr) == -1) |
| 965 | error_f("stdfd_devnull failed")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 965, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "stdfd_devnull failed"); |
| 966 | debug("inetd sockets after dupping: %d, %d", *sock_in, *sock_out)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 966, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "inetd sockets after dupping: %d, %d" , *sock_in, *sock_out); |
| 967 | } |
| 968 | |
| 969 | /* |
| 970 | * Listen for TCP connections |
| 971 | */ |
| 972 | static void |
| 973 | listen_on_addrs(struct listenaddr *la) |
| 974 | { |
| 975 | int ret, listen_sock; |
| 976 | struct addrinfo *ai; |
| 977 | char ntop[NI_MAXHOST256], strport[NI_MAXSERV32]; |
| 978 | |
| 979 | for (ai = la->addrs; ai; ai = ai->ai_next) { |
| 980 | if (ai->ai_family != AF_INET2 && ai->ai_family != AF_INET624) |
| 981 | continue; |
| 982 | if (num_listen_socks >= MAX_LISTEN_SOCKS16) |
| 983 | fatal("Too many listen sockets. "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 984 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Too many listen sockets. " "Enlarge MAX_LISTEN_SOCKS") |
| 984 | "Enlarge MAX_LISTEN_SOCKS")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 984 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Too many listen sockets. " "Enlarge MAX_LISTEN_SOCKS"); |
| 985 | if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| 986 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 987 | NI_NUMERICHOST1|NI_NUMERICSERV2)) != 0) { |
| 988 | error("getnameinfo failed: %.100s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 989, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "getnameinfo failed: %.100s" , ssh_gai_strerror(ret)) |
| 989 | ssh_gai_strerror(ret))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 989, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "getnameinfo failed: %.100s" , ssh_gai_strerror(ret)); |
| 990 | continue; |
| 991 | } |
| 992 | /* Create socket for listening. */ |
| 993 | listen_sock = socket(ai->ai_family, ai->ai_socktype, |
| 994 | ai->ai_protocol); |
| 995 | if (listen_sock == -1) { |
| 996 | /* kernel may not support ipv6 */ |
| 997 | verbose("socket: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 997, 0 , SYSLOG_LEVEL_VERBOSE, ((void *)0), "socket: %.100s", strerror ((*__errno()))); |
| 998 | continue; |
| 999 | } |
| 1000 | if (set_nonblock(listen_sock) == -1) { |
| 1001 | close(listen_sock); |
| 1002 | continue; |
| 1003 | } |
| 1004 | if (fcntl(listen_sock, F_SETFD2, FD_CLOEXEC1) == -1) { |
| 1005 | verbose("socket: CLOEXEC: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1005, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "socket: CLOEXEC: %s", strerror((*__errno()))); |
| 1006 | close(listen_sock); |
| 1007 | continue; |
| 1008 | } |
| 1009 | /* Socket options */ |
| 1010 | set_reuseaddr(listen_sock); |
| 1011 | if (la->rdomain != NULL((void *)0) && |
| 1012 | set_rdomain(listen_sock, la->rdomain) == -1) { |
| 1013 | close(listen_sock); |
| 1014 | continue; |
| 1015 | } |
| 1016 | |
| 1017 | debug("Bind to port %s on %s.", strport, ntop)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1017, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Bind to port %s on %s." , strport, ntop); |
| 1018 | |
| 1019 | /* Bind the socket to the desired port. */ |
| 1020 | if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) == -1) { |
| 1021 | error("Bind to port %s on %s failed: %.200s.",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1022, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Bind to port %s on %s failed: %.200s." , strport, ntop, strerror((*__errno()))) |
| 1022 | strport, ntop, strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1022, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Bind to port %s on %s failed: %.200s." , strport, ntop, strerror((*__errno()))); |
| 1023 | close(listen_sock); |
| 1024 | continue; |
| 1025 | } |
| 1026 | listen_socks[num_listen_socks] = listen_sock; |
| 1027 | num_listen_socks++; |
| 1028 | |
| 1029 | /* Start listening on the port. */ |
| 1030 | if (listen(listen_sock, SSH_LISTEN_BACKLOG128) == -1) |
| 1031 | fatal("listen on [%s]:%s: %.100s",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1032 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "listen on [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))) |
| 1032 | ntop, strport, strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1032 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "listen on [%s]:%s: %.100s" , ntop, strport, strerror((*__errno()))); |
| 1033 | logit("Server listening on %s port %s%s%s.",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1036, 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) |
| 1034 | ntop, strport,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1036, 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) |
| 1035 | la->rdomain == NULL ? "" : " rdomain ",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1036, 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) |
| 1036 | la->rdomain == NULL ? "" : la->rdomain)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1036, 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); |
| 1037 | } |
| 1038 | } |
| 1039 | |
| 1040 | static void |
| 1041 | server_listen(void) |
| 1042 | { |
| 1043 | u_int i; |
| 1044 | |
| 1045 | /* Initialise per-source limit tracking. */ |
| 1046 | srclimit_init(options.max_startups, options.per_source_max_startups, |
| 1047 | options.per_source_masklen_ipv4, options.per_source_masklen_ipv6); |
| 1048 | |
| 1049 | for (i = 0; i < options.num_listen_addrs; i++) { |
| 1050 | listen_on_addrs(&options.listen_addrs[i]); |
| 1051 | freeaddrinfo(options.listen_addrs[i].addrs); |
| 1052 | free(options.listen_addrs[i].rdomain); |
| 1053 | memset(&options.listen_addrs[i], 0, |
| 1054 | sizeof(options.listen_addrs[i])); |
| 1055 | } |
| 1056 | free(options.listen_addrs); |
| 1057 | options.listen_addrs = NULL((void *)0); |
| 1058 | options.num_listen_addrs = 0; |
| 1059 | |
| 1060 | if (!num_listen_socks) |
| 1061 | fatal("Cannot bind any address.")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1061 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Cannot bind any address." ); |
| 1062 | } |
| 1063 | |
| 1064 | /* |
| 1065 | * The main TCP accept loop. Note that, for the non-debug case, returns |
| 1066 | * from this function are in a forked subprocess. |
| 1067 | */ |
| 1068 | static void |
| 1069 | server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s) |
| 1070 | { |
| 1071 | struct pollfd *pfd = NULL((void *)0); |
| 1072 | int i, j, ret, npfd; |
| 1073 | int ostartups = -1, startups = 0, listening = 0, lameduck = 0; |
| 1074 | int startup_p[2] = { -1 , -1 }, *startup_pollfd; |
| 1075 | char c = 0; |
| 1076 | struct sockaddr_storage from; |
| 1077 | socklen_t fromlen; |
| 1078 | pid_t pid; |
| 1079 | sigset_t nsigset, osigset; |
| 1080 | |
| 1081 | /* setup fd set for accept */ |
| 1082 | /* pipes connected to unauthenticated child sshd processes */ |
| 1083 | startup_pipes = xcalloc(options.max_startups, sizeof(int)); |
| 1084 | startup_flags = xcalloc(options.max_startups, sizeof(int)); |
| 1085 | startup_pollfd = xcalloc(options.max_startups, sizeof(int)); |
| 1086 | for (i = 0; i < options.max_startups; i++) |
| 1087 | startup_pipes[i] = -1; |
| 1088 | |
| 1089 | /* |
| 1090 | * Prepare signal mask that we use to block signals that might set |
| 1091 | * received_sigterm or received_sighup, so that we are guaranteed |
| 1092 | * to immediately wake up the ppoll if a signal is received after |
| 1093 | * the flag is checked. |
| 1094 | */ |
| 1095 | sigemptyset(&nsigset); |
| 1096 | sigaddset(&nsigset, SIGHUP1); |
| 1097 | sigaddset(&nsigset, SIGCHLD20); |
| 1098 | sigaddset(&nsigset, SIGTERM15); |
| 1099 | sigaddset(&nsigset, SIGQUIT3); |
| 1100 | |
| 1101 | /* sized for worst-case */ |
| 1102 | pfd = xcalloc(num_listen_socks + options.max_startups, |
| 1103 | sizeof(struct pollfd)); |
| 1104 | |
| 1105 | /* |
| 1106 | * Stay listening for connections until the system crashes or |
| 1107 | * the daemon is killed with a signal. |
| 1108 | */ |
| 1109 | for (;;) { |
| 1110 | sigprocmask(SIG_BLOCK1, &nsigset, &osigset); |
| 1111 | if (received_sigterm) { |
| 1112 | logit("Received signal %d; terminating.",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1113, 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received signal %d; terminating." , (int) received_sigterm) |
| 1113 | (int) received_sigterm)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1113, 0, SYSLOG_LEVEL_INFO, ((void *)0), "Received signal %d; terminating." , (int) received_sigterm); |
| 1114 | close_listen_socks(); |
| 1115 | if (options.pid_file != NULL((void *)0)) |
| 1116 | unlink(options.pid_file); |
| 1117 | exit(received_sigterm == SIGTERM15 ? 0 : 255); |
| 1118 | } |
| 1119 | if (ostartups != startups) { |
| 1120 | setproctitle("%s [listener] %d of %d-%d startups", |
| 1121 | listener_proctitle, startups, |
| 1122 | options.max_startups_begin, options.max_startups); |
| 1123 | ostartups = startups; |
| 1124 | } |
| 1125 | if (received_sighup) { |
| 1126 | if (!lameduck) { |
| 1127 | debug("Received SIGHUP; waiting for children")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1127, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Received SIGHUP; waiting for children" ); |
| 1128 | close_listen_socks(); |
| 1129 | lameduck = 1; |
| 1130 | } |
| 1131 | if (listening <= 0) { |
| 1132 | sigprocmask(SIG_SETMASK3, &osigset, NULL((void *)0)); |
| 1133 | sighup_restart(); |
| 1134 | } |
| 1135 | } |
| 1136 | |
| 1137 | for (i = 0; i < num_listen_socks; i++) { |
| 1138 | pfd[i].fd = listen_socks[i]; |
| 1139 | pfd[i].events = POLLIN0x0001; |
| 1140 | } |
| 1141 | npfd = num_listen_socks; |
| 1142 | for (i = 0; i < options.max_startups; i++) { |
| 1143 | startup_pollfd[i] = -1; |
| 1144 | if (startup_pipes[i] != -1) { |
| 1145 | pfd[npfd].fd = startup_pipes[i]; |
| 1146 | pfd[npfd].events = POLLIN0x0001; |
| 1147 | startup_pollfd[i] = npfd++; |
| 1148 | } |
| 1149 | } |
| 1150 | |
| 1151 | /* Wait until a connection arrives or a child exits. */ |
| 1152 | ret = ppoll(pfd, npfd, NULL((void *)0), &osigset); |
| 1153 | if (ret == -1 && errno(*__errno()) != EINTR4) { |
| 1154 | error("ppoll: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1154, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "ppoll: %.100s", strerror ((*__errno()))); |
| 1155 | if (errno(*__errno()) == EINVAL22) |
| 1156 | cleanup_exit(1); /* can't recover */ |
| 1157 | } |
| 1158 | sigprocmask(SIG_SETMASK3, &osigset, NULL((void *)0)); |
| 1159 | if (ret == -1) |
| 1160 | continue; |
| 1161 | |
| 1162 | for (i = 0; i < options.max_startups; i++) { |
| 1163 | if (startup_pipes[i] == -1 || |
| 1164 | startup_pollfd[i] == -1 || |
| 1165 | !(pfd[startup_pollfd[i]].revents & (POLLIN0x0001|POLLHUP0x0010))) |
| 1166 | continue; |
| 1167 | switch (read(startup_pipes[i], &c, sizeof(c))) { |
| 1168 | case -1: |
| 1169 | if (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35) |
| 1170 | continue; |
| 1171 | if (errno(*__errno()) != EPIPE32) { |
| 1172 | error_f("startup pipe %d (fd=%d): "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1174, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "startup pipe %d (fd=%d): " "read %s", i, startup_pipes[i], strerror((*__errno()))) |
| 1173 | "read %s", i, startup_pipes[i],sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1174, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "startup pipe %d (fd=%d): " "read %s", i, startup_pipes[i], strerror((*__errno()))) |
| 1174 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1174, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "startup pipe %d (fd=%d): " "read %s", i, startup_pipes[i], strerror((*__errno()))); |
| 1175 | } |
| 1176 | /* FALLTHROUGH */ |
| 1177 | case 0: |
| 1178 | /* child exited or completed auth */ |
| 1179 | close(startup_pipes[i]); |
| 1180 | srclimit_done(startup_pipes[i]); |
| 1181 | startup_pipes[i] = -1; |
| 1182 | startups--; |
| 1183 | if (startup_flags[i]) |
| 1184 | listening--; |
| 1185 | break; |
| 1186 | case 1: |
| 1187 | /* child has finished preliminaries */ |
| 1188 | if (startup_flags[i]) { |
| 1189 | listening--; |
| 1190 | startup_flags[i] = 0; |
| 1191 | } |
| 1192 | break; |
| 1193 | } |
| 1194 | } |
| 1195 | for (i = 0; i < num_listen_socks; i++) { |
| 1196 | if (!(pfd[i].revents & POLLIN0x0001)) |
| 1197 | continue; |
| 1198 | fromlen = sizeof(from); |
| 1199 | *newsock = accept(listen_socks[i], |
| 1200 | (struct sockaddr *)&from, &fromlen); |
| 1201 | if (*newsock == -1) { |
| 1202 | if (errno(*__errno()) != EINTR4 && errno(*__errno()) != EWOULDBLOCK35 && |
| 1203 | errno(*__errno()) != ECONNABORTED53) |
| 1204 | error("accept: %.100s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1205, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "accept: %.100s", strerror ((*__errno()))) |
| 1205 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1205, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "accept: %.100s", strerror ((*__errno()))); |
| 1206 | if (errno(*__errno()) == EMFILE24 || errno(*__errno()) == ENFILE23) |
| 1207 | usleep(100 * 1000); |
| 1208 | continue; |
| 1209 | } |
| 1210 | if (unset_nonblock(*newsock) == -1) { |
| 1211 | close(*newsock); |
| 1212 | continue; |
| 1213 | } |
| 1214 | if (pipe(startup_p) == -1) { |
| 1215 | error_f("pipe(startup_p): %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1215, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "pipe(startup_p): %s", strerror ((*__errno()))); |
| 1216 | close(*newsock); |
| 1217 | continue; |
| 1218 | } |
| 1219 | if (drop_connection(*newsock, startups, startup_p[0])) { |
| 1220 | close(*newsock); |
| 1221 | close(startup_p[0]); |
| 1222 | close(startup_p[1]); |
| 1223 | continue; |
| 1224 | } |
| 1225 | |
| 1226 | if (rexec_flag && socketpair(AF_UNIX1, |
| 1227 | SOCK_STREAM1, 0, config_s) == -1) { |
| 1228 | error("reexec socketpair: %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1229, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "reexec socketpair: %s", strerror((*__errno()))) |
| 1229 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1229, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "reexec socketpair: %s", strerror((*__errno()))); |
| 1230 | close(*newsock); |
| 1231 | close(startup_p[0]); |
| 1232 | close(startup_p[1]); |
| 1233 | continue; |
| 1234 | } |
| 1235 | |
| 1236 | for (j = 0; j < options.max_startups; j++) |
| 1237 | if (startup_pipes[j] == -1) { |
| 1238 | startup_pipes[j] = startup_p[0]; |
| 1239 | startups++; |
| 1240 | startup_flags[j] = 1; |
| 1241 | break; |
| 1242 | } |
| 1243 | |
| 1244 | /* |
| 1245 | * Got connection. Fork a child to handle it, unless |
| 1246 | * we are in debugging mode. |
| 1247 | */ |
| 1248 | if (debug_flag) { |
| 1249 | /* |
| 1250 | * In debugging mode. Close the listening |
| 1251 | * socket, and start processing the |
| 1252 | * connection without forking. |
| 1253 | */ |
| 1254 | debug("Server will not fork when running in debugging mode.")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1254, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server will not fork when running in debugging mode." ); |
| 1255 | close_listen_socks(); |
| 1256 | *sock_in = *newsock; |
| 1257 | *sock_out = *newsock; |
| 1258 | close(startup_p[0]); |
| 1259 | close(startup_p[1]); |
| 1260 | startup_pipe = -1; |
| 1261 | pid = getpid(); |
Value stored to 'pid' is never read | |
| 1262 | if (rexec_flag) { |
| 1263 | send_rexec_state(config_s[0], cfg); |
| 1264 | close(config_s[0]); |
| 1265 | } |
| 1266 | free(pfd); |
| 1267 | return; |
| 1268 | } |
| 1269 | |
| 1270 | /* |
| 1271 | * Normal production daemon. Fork, and have |
| 1272 | * the child process the connection. The |
| 1273 | * parent continues listening. |
| 1274 | */ |
| 1275 | listening++; |
| 1276 | if ((pid = fork()) == 0) { |
| 1277 | /* |
| 1278 | * Child. Close the listening and |
| 1279 | * max_startup sockets. Start using |
| 1280 | * the accepted socket. Reinitialize |
| 1281 | * logging (since our pid has changed). |
| 1282 | * We return from this function to handle |
| 1283 | * the connection. |
| 1284 | */ |
| 1285 | startup_pipe = startup_p[1]; |
| 1286 | close_startup_pipes(); |
| 1287 | close_listen_socks(); |
| 1288 | *sock_in = *newsock; |
| 1289 | *sock_out = *newsock; |
| 1290 | log_init(__progname, |
| 1291 | options.log_level, |
| 1292 | options.log_facility, |
| 1293 | log_stderr); |
| 1294 | if (rexec_flag) |
| 1295 | close(config_s[0]); |
| 1296 | else { |
| 1297 | /* |
| 1298 | * Signal parent that the preliminaries |
| 1299 | * for this child are complete. For the |
| 1300 | * re-exec case, this happens after the |
| 1301 | * child has received the rexec state |
| 1302 | * from the server. |
| 1303 | */ |
| 1304 | (void)atomicio(vwrite(ssize_t (*)(int, void *, size_t))write, startup_pipe, |
| 1305 | "\0", 1); |
| 1306 | } |
| 1307 | free(pfd); |
| 1308 | return; |
| 1309 | } |
| 1310 | |
| 1311 | /* Parent. Stay in the loop. */ |
| 1312 | if (pid == -1) |
| 1313 | error("fork: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1313, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "fork: %.100s", strerror ((*__errno()))); |
| 1314 | else |
| 1315 | debug("Forked child %ld.", (long)pid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1315, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Forked child %ld.", (long )pid); |
| 1316 | |
| 1317 | close(startup_p[1]); |
| 1318 | |
| 1319 | if (rexec_flag) { |
| 1320 | close(config_s[1]); |
| 1321 | send_rexec_state(config_s[0], cfg); |
| 1322 | close(config_s[0]); |
| 1323 | } |
| 1324 | close(*newsock); |
| 1325 | } |
| 1326 | } |
| 1327 | } |
| 1328 | |
| 1329 | /* |
| 1330 | * If IP options are supported, make sure there are none (log and |
| 1331 | * return an error if any are found). Basically we are worried about |
| 1332 | * source routing; it can be used to pretend you are somebody |
| 1333 | * (ip-address) you are not. That itself may be "almost acceptable" |
| 1334 | * under certain circumstances, but rhosts authentication is useless |
| 1335 | * if source routing is accepted. Notice also that if we just dropped |
| 1336 | * source routing here, the other side could use IP spoofing to do |
| 1337 | * rest of the interaction and could still bypass security. So we |
| 1338 | * exit here if we detect any IP options. |
| 1339 | */ |
| 1340 | static void |
| 1341 | check_ip_options(struct ssh *ssh) |
| 1342 | { |
| 1343 | int sock_in = ssh_packet_get_connection_in(ssh); |
| 1344 | struct sockaddr_storage from; |
| 1345 | u_char opts[200]; |
| 1346 | socklen_t i, option_size = sizeof(opts), fromlen = sizeof(from); |
| 1347 | char text[sizeof(opts) * 3 + 1]; |
| 1348 | |
| 1349 | memset(&from, 0, sizeof(from)); |
| 1350 | if (getpeername(sock_in, (struct sockaddr *)&from, |
| 1351 | &fromlen) == -1) |
| 1352 | return; |
| 1353 | if (from.ss_family != AF_INET2) |
| 1354 | return; |
| 1355 | /* XXX IPv6 options? */ |
| 1356 | |
| 1357 | if (getsockopt(sock_in, IPPROTO_IP0, IP_OPTIONS1, opts, |
| 1358 | &option_size) >= 0 && option_size != 0) { |
| 1359 | text[0] = '\0'; |
| 1360 | for (i = 0; i < option_size; i++) |
| 1361 | snprintf(text + i*3, sizeof(text) - i*3, |
| 1362 | " %2.2x", opts[i]); |
| 1363 | fatal("Connection from %.100s port %d with IP opts: %.800s",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1364 , 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 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1364 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Connection from %.100s port %d with IP opts: %.800s" , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text); |
| 1365 | } |
| 1366 | return; |
| 1367 | } |
| 1368 | |
| 1369 | /* Set the routing domain for this process */ |
| 1370 | static void |
| 1371 | set_process_rdomain(struct ssh *ssh, const char *name) |
| 1372 | { |
| 1373 | int rtable, ortable = getrtable(); |
| 1374 | const char *errstr; |
| 1375 | |
| 1376 | if (name == NULL((void *)0)) |
| 1377 | return; /* default */ |
| 1378 | |
| 1379 | if (strcmp(name, "%D") == 0) { |
| 1380 | /* "expands" to routing domain of connection */ |
| 1381 | if ((name = ssh_packet_rdomain_in(ssh)) == NULL((void *)0)) |
| 1382 | return; |
| 1383 | } |
| 1384 | |
| 1385 | rtable = (int)strtonum(name, 0, 255, &errstr); |
| 1386 | if (errstr != NULL((void *)0)) /* Shouldn't happen */ |
| 1387 | fatal("Invalid routing domain \"%s\": %s", name, errstr)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1387 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Invalid routing domain \"%s\": %s" , name, errstr); |
| 1388 | if (rtable != ortable && setrtable(rtable) != 0) |
| 1389 | fatal("Unable to set routing domain %d: %s",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1390 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Unable to set routing domain %d: %s" , rtable, strerror((*__errno()))) |
| 1390 | rtable, strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1390 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Unable to set routing domain %d: %s" , rtable, strerror((*__errno()))); |
| 1391 | debug_f("set routing domain %d (was %d)", rtable, ortable)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1391, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "set routing domain %d (was %d)" , rtable, ortable); |
| 1392 | } |
| 1393 | |
| 1394 | static void |
| 1395 | accumulate_host_timing_secret(struct sshbuf *server_cfg, |
| 1396 | struct sshkey *key) |
| 1397 | { |
| 1398 | static struct ssh_digest_ctx *ctx; |
| 1399 | u_char *hash; |
| 1400 | size_t len; |
| 1401 | struct sshbuf *buf; |
| 1402 | int r; |
| 1403 | |
| 1404 | if (ctx == NULL((void *)0) && (ctx = ssh_digest_start(SSH_DIGEST_SHA5124)) == NULL((void *)0)) |
| 1405 | fatal_f("ssh_digest_start")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1405 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "ssh_digest_start"); |
| 1406 | if (key == NULL((void *)0)) { /* finalize */ |
| 1407 | /* add server config in case we are using agent for host keys */ |
| 1408 | if (ssh_digest_update(ctx, sshbuf_ptr(server_cfg), |
| 1409 | sshbuf_len(server_cfg)) != 0) |
| 1410 | fatal_f("ssh_digest_update")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1410 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "ssh_digest_update"); |
| 1411 | len = ssh_digest_bytes(SSH_DIGEST_SHA5124); |
| 1412 | hash = xmalloc(len); |
| 1413 | if (ssh_digest_final(ctx, hash, len) != 0) |
| 1414 | fatal_f("ssh_digest_final")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1414 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "ssh_digest_final"); |
| 1415 | 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]) ); |
| 1416 | freezero(hash, len); |
| 1417 | ssh_digest_free(ctx); |
| 1418 | ctx = NULL((void *)0); |
| 1419 | return; |
| 1420 | } |
| 1421 | if ((buf = sshbuf_new()) == NULL((void *)0)) |
| 1422 | fatal_f("could not allocate buffer")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1422 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "could not allocate buffer" ); |
| 1423 | if ((r = sshkey_private_serialize(key, buf)) != 0) |
| 1424 | fatal_fr(r, "encode %s key", sshkey_ssh_name(key))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1424 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "encode %s key", sshkey_ssh_name (key)); |
| 1425 | if (ssh_digest_update(ctx, sshbuf_ptr(buf), sshbuf_len(buf)) != 0) |
| 1426 | fatal_f("ssh_digest_update")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1426 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "ssh_digest_update"); |
| 1427 | sshbuf_reset(buf); |
| 1428 | sshbuf_free(buf); |
| 1429 | } |
| 1430 | |
| 1431 | static char * |
| 1432 | prepare_proctitle(int ac, char **av) |
| 1433 | { |
| 1434 | char *ret = NULL((void *)0); |
| 1435 | int i; |
| 1436 | |
| 1437 | for (i = 0; i < ac; i++) |
| 1438 | xextendf(&ret, " ", "%s", av[i]); |
| 1439 | return ret; |
| 1440 | } |
| 1441 | |
| 1442 | static void |
| 1443 | print_config(struct ssh *ssh, struct connection_info *connection_info) |
| 1444 | { |
| 1445 | /* |
| 1446 | * If no connection info was provided by -C then use |
| 1447 | * use a blank one that will cause no predicate to match. |
| 1448 | */ |
| 1449 | if (connection_info == NULL((void *)0)) |
| 1450 | connection_info = get_connection_info(ssh, 0, 0); |
| 1451 | connection_info->test = 1; |
| 1452 | parse_server_match_config(&options, &includes, connection_info); |
| 1453 | dump_config(&options); |
| 1454 | exit(0); |
| 1455 | } |
| 1456 | |
| 1457 | /* |
| 1458 | * Main program for the daemon. |
| 1459 | */ |
| 1460 | int |
| 1461 | main(int ac, char **av) |
| 1462 | { |
| 1463 | struct ssh *ssh = NULL((void *)0); |
| 1464 | extern char *optarg; |
| 1465 | extern int optind; |
| 1466 | int r, opt, on = 1, do_dump_cfg = 0, already_daemon, remote_port; |
| 1467 | int sock_in = -1, sock_out = -1, newsock = -1; |
| 1468 | const char *remote_ip, *rdomain; |
| 1469 | char *fp, *line, *laddr, *logfile = NULL((void *)0); |
| 1470 | int config_s[2] = { -1 , -1 }; |
| 1471 | u_int i, j; |
| 1472 | u_int64_t ibytes, obytes; |
| 1473 | mode_t new_umask; |
| 1474 | struct sshkey *key; |
| 1475 | struct sshkey *pubkey; |
| 1476 | int keytype; |
| 1477 | Authctxt *authctxt; |
| 1478 | struct connection_info *connection_info = NULL((void *)0); |
| 1479 | sigset_t sigmask; |
| 1480 | |
| 1481 | sigemptyset(&sigmask); |
| 1482 | sigprocmask(SIG_SETMASK3, &sigmask, NULL((void *)0)); |
| 1483 | |
| 1484 | /* Save argv. */ |
| 1485 | saved_argv = av; |
| 1486 | rexec_argc = ac; |
| 1487 | |
| 1488 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| 1489 | sanitise_stdfd(); |
| 1490 | |
| 1491 | /* Initialize configuration options to their default values. */ |
| 1492 | initialize_server_options(&options); |
| 1493 | |
| 1494 | /* Parse command-line arguments. */ |
| 1495 | while ((opt = getopt(ac, av, |
| 1496 | "C:E:b:c:f:g:h:k:o:p:u:46DGQRTdeiqrtV")) != -1) { |
| 1497 | switch (opt) { |
| 1498 | case '4': |
| 1499 | options.address_family = AF_INET2; |
| 1500 | break; |
| 1501 | case '6': |
| 1502 | options.address_family = AF_INET624; |
| 1503 | break; |
| 1504 | case 'f': |
| 1505 | config_file_name = optarg; |
| 1506 | break; |
| 1507 | case 'c': |
| 1508 | servconf_add_hostcert("[command-line]", 0, |
| 1509 | &options, optarg); |
| 1510 | break; |
| 1511 | case 'd': |
| 1512 | if (debug_flag == 0) { |
| 1513 | debug_flag = 1; |
| 1514 | options.log_level = SYSLOG_LEVEL_DEBUG1; |
| 1515 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) |
| 1516 | options.log_level++; |
| 1517 | break; |
| 1518 | case 'D': |
| 1519 | no_daemon_flag = 1; |
| 1520 | break; |
| 1521 | case 'G': |
| 1522 | do_dump_cfg = 1; |
| 1523 | break; |
| 1524 | case 'E': |
| 1525 | logfile = optarg; |
| 1526 | /* FALLTHROUGH */ |
| 1527 | case 'e': |
| 1528 | log_stderr = 1; |
| 1529 | break; |
| 1530 | case 'i': |
| 1531 | inetd_flag = 1; |
| 1532 | break; |
| 1533 | case 'r': |
| 1534 | rexec_flag = 0; |
| 1535 | break; |
| 1536 | case 'R': |
| 1537 | rexeced_flag = 1; |
| 1538 | inetd_flag = 1; |
| 1539 | break; |
| 1540 | case 'Q': |
| 1541 | /* ignored */ |
| 1542 | break; |
| 1543 | case 'q': |
| 1544 | options.log_level = SYSLOG_LEVEL_QUIET; |
| 1545 | break; |
| 1546 | case 'b': |
| 1547 | /* protocol 1, ignored */ |
| 1548 | break; |
| 1549 | case 'p': |
| 1550 | options.ports_from_cmdline = 1; |
| 1551 | if (options.num_ports >= MAX_PORTS256) { |
| 1552 | fprintf(stderr(&__sF[2]), "too many ports.\n"); |
| 1553 | exit(1); |
| 1554 | } |
| 1555 | options.ports[options.num_ports++] = a2port(optarg); |
| 1556 | if (options.ports[options.num_ports-1] <= 0) { |
| 1557 | fprintf(stderr(&__sF[2]), "Bad port number.\n"); |
| 1558 | exit(1); |
| 1559 | } |
| 1560 | break; |
| 1561 | case 'g': |
| 1562 | if ((options.login_grace_time = convtime(optarg)) == -1) { |
| 1563 | fprintf(stderr(&__sF[2]), "Invalid login grace time.\n"); |
| 1564 | exit(1); |
| 1565 | } |
| 1566 | break; |
| 1567 | case 'k': |
| 1568 | /* protocol 1, ignored */ |
| 1569 | break; |
| 1570 | case 'h': |
| 1571 | servconf_add_hostkey("[command-line]", 0, |
| 1572 | &options, optarg, 1); |
| 1573 | break; |
| 1574 | case 't': |
| 1575 | test_flag = 1; |
| 1576 | break; |
| 1577 | case 'T': |
| 1578 | test_flag = 2; |
| 1579 | break; |
| 1580 | case 'C': |
| 1581 | connection_info = get_connection_info(ssh, 0, 0); |
| 1582 | if (parse_server_match_testspec(connection_info, |
| 1583 | optarg) == -1) |
| 1584 | exit(1); |
| 1585 | break; |
| 1586 | case 'u': |
| 1587 | utmp_len = (u_int)strtonum(optarg, 0, HOST_NAME_MAX255+1+1, NULL((void *)0)); |
| 1588 | if (utmp_len > HOST_NAME_MAX255+1) { |
| 1589 | fprintf(stderr(&__sF[2]), "Invalid utmp length.\n"); |
| 1590 | exit(1); |
| 1591 | } |
| 1592 | break; |
| 1593 | case 'o': |
| 1594 | line = xstrdup(optarg); |
| 1595 | if (process_server_config_line(&options, line, |
| 1596 | "command-line", 0, NULL((void *)0), NULL((void *)0), &includes) != 0) |
| 1597 | exit(1); |
| 1598 | free(line); |
| 1599 | break; |
| 1600 | case 'V': |
| 1601 | fprintf(stderr(&__sF[2]), "%s, %s\n", |
| 1602 | SSH_VERSION"OpenSSH_9.6", SSH_OPENSSL_VERSIONOpenSSL_version(0)); |
| 1603 | exit(0); |
| 1604 | default: |
| 1605 | usage(); |
| 1606 | break; |
| 1607 | } |
| 1608 | } |
| 1609 | if (rexeced_flag || inetd_flag) |
| 1610 | rexec_flag = 0; |
| 1611 | if (!test_flag && !do_dump_cfg && rexec_flag && !path_absolute(av[0])) |
| 1612 | fatal("sshd re-exec requires execution with an absolute path")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1612 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "sshd re-exec requires execution with an absolute path" ); |
| 1613 | if (rexeced_flag) |
| 1614 | closefrom(REEXEC_MIN_FREE_FD(2 + 4)); |
| 1615 | else |
| 1616 | closefrom(REEXEC_DEVCRYPTO_RESERVED_FD(2 + 1)); |
| 1617 | |
| 1618 | #ifdef WITH_OPENSSL1 |
| 1619 | OpenSSL_add_all_algorithms()OPENSSL_add_all_algorithms_noconf(); |
| 1620 | #endif |
| 1621 | |
| 1622 | /* If requested, redirect the logs to the specified logfile. */ |
| 1623 | if (logfile != NULL((void *)0)) |
| 1624 | log_redirect_stderr_to(logfile); |
| 1625 | /* |
| 1626 | * Force logging to stderr until we have loaded the private host |
| 1627 | * key (unless started from inetd) |
| 1628 | */ |
| 1629 | log_init(__progname, |
| 1630 | options.log_level == SYSLOG_LEVEL_NOT_SET ? |
| 1631 | SYSLOG_LEVEL_INFO : options.log_level, |
| 1632 | options.log_facility == SYSLOG_FACILITY_NOT_SET ? |
| 1633 | SYSLOG_FACILITY_AUTH : options.log_facility, |
| 1634 | log_stderr || !inetd_flag || debug_flag); |
| 1635 | |
| 1636 | sensitive_data.have_ssh2_key = 0; |
| 1637 | |
| 1638 | /* |
| 1639 | * If we're not doing an extended test do not silently ignore connection |
| 1640 | * test params. |
| 1641 | */ |
| 1642 | if (test_flag < 2 && connection_info != NULL((void *)0)) |
| 1643 | fatal("Config test connection parameter (-C) provided without "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1644 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Config test connection parameter (-C) provided without " "test mode (-T)") |
| 1644 | "test mode (-T)")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1644 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Config test connection parameter (-C) provided without " "test mode (-T)"); |
| 1645 | |
| 1646 | /* Fetch our configuration */ |
| 1647 | if ((cfg = sshbuf_new()) == NULL((void *)0)) |
| 1648 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1648 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
| 1649 | if (rexeced_flag) { |
| 1650 | setproctitle("%s", "[rexeced]"); |
| 1651 | recv_rexec_state(REEXEC_CONFIG_PASS_FD(2 + 3), cfg); |
| 1652 | if (!debug_flag) { |
| 1653 | startup_pipe = dup(REEXEC_STARTUP_PIPE_FD(2 + 2)); |
| 1654 | close(REEXEC_STARTUP_PIPE_FD(2 + 2)); |
| 1655 | /* |
| 1656 | * Signal parent that this child is at a point where |
| 1657 | * they can go away if they have a SIGHUP pending. |
| 1658 | */ |
| 1659 | (void)atomicio(vwrite(ssize_t (*)(int, void *, size_t))write, startup_pipe, "\0", 1); |
| 1660 | } |
| 1661 | } else if (strcasecmp(config_file_name, "none") != 0) |
| 1662 | load_server_config(config_file_name, cfg); |
| 1663 | |
| 1664 | parse_server_config(&options, rexeced_flag ? "rexec" : config_file_name, |
| 1665 | cfg, &includes, NULL((void *)0), rexeced_flag); |
| 1666 | |
| 1667 | #ifdef WITH_OPENSSL1 |
| 1668 | if (options.moduli_file != NULL((void *)0)) |
| 1669 | dh_set_moduli_file(options.moduli_file); |
| 1670 | #endif |
| 1671 | |
| 1672 | /* Fill in default values for those options not explicitly set. */ |
| 1673 | fill_default_server_options(&options); |
| 1674 | |
| 1675 | /* Check that options are sensible */ |
| 1676 | if (options.authorized_keys_command_user == NULL((void *)0) && |
| 1677 | (options.authorized_keys_command != NULL((void *)0) && |
| 1678 | strcasecmp(options.authorized_keys_command, "none") != 0)) |
| 1679 | fatal("AuthorizedKeysCommand set without "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1680 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "AuthorizedKeysCommand set without " "AuthorizedKeysCommandUser") |
| 1680 | "AuthorizedKeysCommandUser")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1680 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "AuthorizedKeysCommand set without " "AuthorizedKeysCommandUser"); |
| 1681 | if (options.authorized_principals_command_user == NULL((void *)0) && |
| 1682 | (options.authorized_principals_command != NULL((void *)0) && |
| 1683 | strcasecmp(options.authorized_principals_command, "none") != 0)) |
| 1684 | fatal("AuthorizedPrincipalsCommand set without "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1685 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "AuthorizedPrincipalsCommand set without " "AuthorizedPrincipalsCommandUser") |
| 1685 | "AuthorizedPrincipalsCommandUser")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1685 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "AuthorizedPrincipalsCommand set without " "AuthorizedPrincipalsCommandUser"); |
| 1686 | |
| 1687 | /* |
| 1688 | * Check whether there is any path through configured auth methods. |
| 1689 | * Unfortunately it is not possible to verify this generally before |
| 1690 | * daemonisation in the presence of Match block, but this catches |
| 1691 | * and warns for trivial misconfigurations that could break login. |
| 1692 | */ |
| 1693 | if (options.num_auth_methods != 0) { |
| 1694 | for (i = 0; i < options.num_auth_methods; i++) { |
| 1695 | if (auth2_methods_valid(options.auth_methods[i], |
| 1696 | 1) == 0) |
| 1697 | break; |
| 1698 | } |
| 1699 | if (i >= options.num_auth_methods) |
| 1700 | fatal("AuthenticationMethods cannot be satisfied by "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1701 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "AuthenticationMethods cannot be satisfied by " "enabled authentication methods") |
| 1701 | "enabled authentication methods")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1701 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "AuthenticationMethods cannot be satisfied by " "enabled authentication methods"); |
| 1702 | } |
| 1703 | |
| 1704 | /* Check that there are no remaining arguments. */ |
| 1705 | if (optind < ac) { |
| 1706 | fprintf(stderr(&__sF[2]), "Extra argument %s.\n", av[optind]); |
| 1707 | exit(1); |
| 1708 | } |
| 1709 | |
| 1710 | debug("sshd version %s, %s", SSH_VERSION, SSH_OPENSSL_VERSION)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1710, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "sshd version %s, %s", "OpenSSH_9.6" , OpenSSL_version(0)); |
| 1711 | |
| 1712 | if (do_dump_cfg) |
| 1713 | print_config(ssh, connection_info); |
| 1714 | |
| 1715 | /* load host keys */ |
| 1716 | sensitive_data.host_keys = xcalloc(options.num_host_key_files, |
| 1717 | sizeof(struct sshkey *)); |
| 1718 | sensitive_data.host_pubkeys = xcalloc(options.num_host_key_files, |
| 1719 | sizeof(struct sshkey *)); |
| 1720 | |
| 1721 | if (options.host_key_agent) { |
| 1722 | if (strcmp(options.host_key_agent, SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK")) |
| 1723 | setenv(SSH_AUTHSOCKET_ENV_NAME"SSH_AUTH_SOCK", |
| 1724 | options.host_key_agent, 1); |
| 1725 | if ((r = ssh_get_authentication_socket(NULL((void *)0))) == 0) |
| 1726 | have_agent = 1; |
| 1727 | else |
| 1728 | error_r(r, "Could not connect to agent \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1729, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not connect to agent \"%s\"" , options.host_key_agent) |
| 1729 | options.host_key_agent)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1729, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not connect to agent \"%s\"" , options.host_key_agent); |
| 1730 | } |
| 1731 | |
| 1732 | for (i = 0; i < options.num_host_key_files; i++) { |
| 1733 | int ll = options.host_key_file_userprovided[i] ? |
| 1734 | SYSLOG_LEVEL_ERROR : SYSLOG_LEVEL_DEBUG1; |
| 1735 | |
| 1736 | if (options.host_key_files[i] == NULL((void *)0)) |
| 1737 | continue; |
| 1738 | if ((r = sshkey_load_private(options.host_key_files[i], "", |
| 1739 | &key, NULL((void *)0))) != 0 && r != SSH_ERR_SYSTEM_ERROR-24) |
| 1740 | do_log2_r(r, ll, "Unable to load host key \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1741, 0, ll, ssh_err(r), "Unable to load host key \"%s\"", options .host_key_files[i]) |
| 1741 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1741, 0, ll, ssh_err(r), "Unable to load host key \"%s\"", options .host_key_files[i]); |
| 1742 | if (sshkey_is_sk(key) && |
| 1743 | key->sk_flags & SSH_SK_USER_PRESENCE_REQD0x01) { |
| 1744 | debug("host key %s requires user presence, ignoring",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1745, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "host key %s requires user presence, ignoring" , options.host_key_files[i]) |
| 1745 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1745, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "host key %s requires user presence, ignoring" , options.host_key_files[i]); |
| 1746 | key->sk_flags &= ~SSH_SK_USER_PRESENCE_REQD0x01; |
| 1747 | } |
| 1748 | if (r == 0 && key != NULL((void *)0) && |
| 1749 | (r = sshkey_shield_private(key)) != 0) { |
| 1750 | do_log2_r(r, ll, "Unable to shield host key \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1751, 0, ll, ssh_err(r), "Unable to shield host key \"%s\"", options .host_key_files[i]) |
| 1751 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1751, 0, ll, ssh_err(r), "Unable to shield host key \"%s\"", options .host_key_files[i]); |
| 1752 | sshkey_free(key); |
| 1753 | key = NULL((void *)0); |
| 1754 | } |
| 1755 | if ((r = sshkey_load_public(options.host_key_files[i], |
| 1756 | &pubkey, NULL((void *)0))) != 0 && r != SSH_ERR_SYSTEM_ERROR-24) |
| 1757 | do_log2_r(r, ll, "Unable to load host key \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1758, 0, ll, ssh_err(r), "Unable to load host key \"%s\"", options .host_key_files[i]) |
| 1758 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1758, 0, ll, ssh_err(r), "Unable to load host key \"%s\"", options .host_key_files[i]); |
| 1759 | if (pubkey != NULL((void *)0) && key != NULL((void *)0)) { |
| 1760 | if (!sshkey_equal(pubkey, key)) { |
| 1761 | error("Public key for %s does not match "sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1762, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Public key for %s does not match " "private key", options.host_key_files[i]) |
| 1762 | "private key", options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1762, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Public key for %s does not match " "private key", options.host_key_files[i]); |
| 1763 | sshkey_free(pubkey); |
| 1764 | pubkey = NULL((void *)0); |
| 1765 | } |
| 1766 | } |
| 1767 | if (pubkey == NULL((void *)0) && key != NULL((void *)0)) { |
| 1768 | if ((r = sshkey_from_private(key, &pubkey)) != 0) |
| 1769 | fatal_r(r, "Could not demote key: \"%s\"",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1770 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "Could not demote key: \"%s\"" , options.host_key_files[i]) |
| 1770 | options.host_key_files[i])sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1770 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "Could not demote key: \"%s\"" , options.host_key_files[i]); |
| 1771 | } |
| 1772 | if (pubkey != NULL((void *)0) && (r = sshkey_check_rsa_length(pubkey, |
| 1773 | options.required_rsa_size)) != 0) { |
| 1774 | error_fr(r, "Host key %s", options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1774, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "Host key %s", options.host_key_files [i]); |
| 1775 | sshkey_free(pubkey); |
| 1776 | sshkey_free(key); |
| 1777 | continue; |
| 1778 | } |
| 1779 | sensitive_data.host_keys[i] = key; |
| 1780 | sensitive_data.host_pubkeys[i] = pubkey; |
| 1781 | |
| 1782 | if (key == NULL((void *)0) && pubkey != NULL((void *)0) && have_agent) { |
| 1783 | debug("will rely on agent for hostkey %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1784, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "will rely on agent for hostkey %s" , options.host_key_files[i]) |
| 1784 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1784, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "will rely on agent for hostkey %s" , options.host_key_files[i]); |
| 1785 | keytype = pubkey->type; |
| 1786 | } else if (key != NULL((void *)0)) { |
| 1787 | keytype = key->type; |
| 1788 | accumulate_host_timing_secret(cfg, key); |
| 1789 | } else { |
| 1790 | do_log2(ll, "Unable to load host key: %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1791, 0, ll, ((void *)0), "Unable to load host key: %s", options.host_key_files [i]) |
| 1791 | options.host_key_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1791, 0, ll, ((void *)0), "Unable to load host key: %s", options.host_key_files [i]); |
| 1792 | sensitive_data.host_keys[i] = NULL((void *)0); |
| 1793 | sensitive_data.host_pubkeys[i] = NULL((void *)0); |
| 1794 | continue; |
| 1795 | } |
| 1796 | |
| 1797 | switch (keytype) { |
| 1798 | case KEY_RSA: |
| 1799 | case KEY_DSA: |
| 1800 | case KEY_ECDSA: |
| 1801 | case KEY_ED25519: |
| 1802 | case KEY_ECDSA_SK: |
| 1803 | case KEY_ED25519_SK: |
| 1804 | case KEY_XMSS: |
| 1805 | if (have_agent || key != NULL((void *)0)) |
| 1806 | sensitive_data.have_ssh2_key = 1; |
| 1807 | break; |
| 1808 | } |
| 1809 | if ((fp = sshkey_fingerprint(pubkey, options.fingerprint_hash, |
| 1810 | SSH_FP_DEFAULT)) == NULL((void *)0)) |
| 1811 | fatal("sshkey_fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1811 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "sshkey_fingerprint failed" ); |
| 1812 | debug("%s host key #%d: %s %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1813, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s host key #%d: %s %s" , key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp) |
| 1813 | key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1813, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "%s host key #%d: %s %s" , key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp); |
| 1814 | free(fp); |
| 1815 | } |
| 1816 | accumulate_host_timing_secret(cfg, NULL((void *)0)); |
| 1817 | if (!sensitive_data.have_ssh2_key) { |
| 1818 | logit("sshd: no hostkeys available -- exiting.")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1818, 0, SYSLOG_LEVEL_INFO, ((void *)0), "sshd: no hostkeys available -- exiting." ); |
| 1819 | exit(1); |
| 1820 | } |
| 1821 | |
| 1822 | /* |
| 1823 | * Load certificates. They are stored in an array at identical |
| 1824 | * indices to the public keys that they relate to. |
| 1825 | */ |
| 1826 | sensitive_data.host_certificates = xcalloc(options.num_host_key_files, |
| 1827 | sizeof(struct sshkey *)); |
| 1828 | for (i = 0; i < options.num_host_key_files; i++) |
| 1829 | sensitive_data.host_certificates[i] = NULL((void *)0); |
| 1830 | |
| 1831 | for (i = 0; i < options.num_host_cert_files; i++) { |
| 1832 | if (options.host_cert_files[i] == NULL((void *)0)) |
| 1833 | continue; |
| 1834 | if ((r = sshkey_load_public(options.host_cert_files[i], |
| 1835 | &key, NULL((void *)0))) != 0) { |
| 1836 | error_r(r, "Could not load host certificate \"%s\"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1837, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not load host certificate \"%s\"" , options.host_cert_files[i]) |
| 1837 | options.host_cert_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1837, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Could not load host certificate \"%s\"" , options.host_cert_files[i]); |
| 1838 | continue; |
| 1839 | } |
| 1840 | if (!sshkey_is_cert(key)) { |
| 1841 | error("Certificate file is not a certificate: %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1842, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Certificate file is not a certificate: %s" , options.host_cert_files[i]) |
| 1842 | options.host_cert_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1842, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Certificate file is not a certificate: %s" , options.host_cert_files[i]); |
| 1843 | sshkey_free(key); |
| 1844 | continue; |
| 1845 | } |
| 1846 | /* Find matching private key */ |
| 1847 | for (j = 0; j < options.num_host_key_files; j++) { |
| 1848 | if (sshkey_equal_public(key, |
| 1849 | sensitive_data.host_pubkeys[j])) { |
| 1850 | sensitive_data.host_certificates[j] = key; |
| 1851 | break; |
| 1852 | } |
| 1853 | } |
| 1854 | if (j >= options.num_host_key_files) { |
| 1855 | error("No matching private key for certificate: %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1856, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "No matching private key for certificate: %s" , options.host_cert_files[i]) |
| 1856 | options.host_cert_files[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1856, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "No matching private key for certificate: %s" , options.host_cert_files[i]); |
| 1857 | sshkey_free(key); |
| 1858 | continue; |
| 1859 | } |
| 1860 | sensitive_data.host_certificates[j] = key; |
| 1861 | debug("host certificate: #%u type %d %s", j, key->type,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1862, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "host certificate: #%u type %d %s" , j, key->type, sshkey_type(key)) |
| 1862 | sshkey_type(key))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1862, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "host certificate: #%u type %d %s" , j, key->type, sshkey_type(key)); |
| 1863 | } |
| 1864 | |
| 1865 | if (use_privsep) { |
| 1866 | struct stat st; |
| 1867 | |
| 1868 | if (getpwnam(SSH_PRIVSEP_USER"sshd") == NULL((void *)0)) |
| 1869 | fatal("Privilege separation user %s does not exist",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1870 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Privilege separation user %s does not exist" , "sshd") |
| 1870 | SSH_PRIVSEP_USER)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1870 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Privilege separation user %s does not exist" , "sshd"); |
| 1871 | endpwent(); |
| 1872 | if ((stat(_PATH_PRIVSEP_CHROOT_DIR"/var/empty", &st) == -1) || |
| 1873 | (S_ISDIR(st.st_mode)((st.st_mode & 0170000) == 0040000) == 0)) |
| 1874 | fatal("Missing privilege separation directory: %s",sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1875 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Missing privilege separation directory: %s" , "/var/empty") |
| 1875 | _PATH_PRIVSEP_CHROOT_DIR)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1875 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Missing privilege separation directory: %s" , "/var/empty"); |
| 1876 | if (st.st_uid != 0 || (st.st_mode & (S_IWGRP0000020|S_IWOTH0000002)) != 0) |
| 1877 | fatal("%s must be owned by root and not group or "sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1878 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "%s must be owned by root and not group or " "world-writable.", "/var/empty") |
| 1878 | "world-writable.", _PATH_PRIVSEP_CHROOT_DIR)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1878 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "%s must be owned by root and not group or " "world-writable.", "/var/empty"); |
| 1879 | } |
| 1880 | |
| 1881 | if (test_flag > 1) |
| 1882 | print_config(ssh, connection_info); |
| 1883 | |
| 1884 | /* Configuration looks good, so exit if in test mode. */ |
| 1885 | if (test_flag) |
| 1886 | exit(0); |
| 1887 | |
| 1888 | if (rexec_flag) { |
| 1889 | if (rexec_argc < 0) |
| 1890 | fatal("rexec_argc %d < 0", rexec_argc)sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1890 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "rexec_argc %d < 0", rexec_argc); |
| 1891 | rexec_argv = xcalloc(rexec_argc + 2, sizeof(char *)); |
| 1892 | for (i = 0; i < (u_int)rexec_argc; i++) { |
| 1893 | debug("rexec_argv[%d]='%s'", i, saved_argv[i])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1893, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "rexec_argv[%d]='%s'", i , saved_argv[i]); |
| 1894 | rexec_argv[i] = saved_argv[i]; |
| 1895 | } |
| 1896 | rexec_argv[rexec_argc] = "-R"; |
| 1897 | rexec_argv[rexec_argc + 1] = NULL((void *)0); |
| 1898 | } |
| 1899 | listener_proctitle = prepare_proctitle(ac, av); |
| 1900 | |
| 1901 | /* Ensure that umask disallows at least group and world write */ |
| 1902 | new_umask = umask(0077) | 0022; |
| 1903 | (void) umask(new_umask); |
| 1904 | |
| 1905 | /* Initialize the log (it is reinitialized below in case we forked). */ |
| 1906 | if (debug_flag && (!inetd_flag || rexeced_flag)) |
| 1907 | log_stderr = 1; |
| 1908 | log_init(__progname, options.log_level, |
| 1909 | options.log_facility, log_stderr); |
| 1910 | for (i = 0; i < options.num_log_verbose; i++) |
| 1911 | log_verbose_add(options.log_verbose[i]); |
| 1912 | |
| 1913 | /* |
| 1914 | * If not in debugging mode, not started from inetd and not already |
| 1915 | * daemonized (eg re-exec via SIGHUP), disconnect from the controlling |
| 1916 | * terminal, and fork. The original process exits. |
| 1917 | */ |
| 1918 | already_daemon = daemonized(); |
| 1919 | if (!(debug_flag || inetd_flag || no_daemon_flag || already_daemon)) { |
| 1920 | |
| 1921 | if (daemon(0, 0) == -1) |
| 1922 | fatal("daemon() failed: %.200s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1922 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "daemon() failed: %.200s" , strerror((*__errno()))); |
| 1923 | |
| 1924 | disconnect_controlling_tty(); |
| 1925 | } |
| 1926 | /* Reinitialize the log (because of the fork above). */ |
| 1927 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
| 1928 | |
| 1929 | /* |
| 1930 | * Chdir to the root directory so that the current disk can be |
| 1931 | * unmounted if desired. |
| 1932 | */ |
| 1933 | if (chdir("/") == -1) |
| 1934 | error("chdir(\"/\"): %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1934, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "chdir(\"/\"): %s", strerror ((*__errno()))); |
| 1935 | |
| 1936 | /* ignore SIGPIPE */ |
| 1937 | ssh_signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 1938 | |
| 1939 | /* Get a connection, either from inetd or a listening TCP socket */ |
| 1940 | if (inetd_flag) { |
| 1941 | server_accept_inetd(&sock_in, &sock_out); |
| 1942 | } else { |
| 1943 | server_listen(); |
| 1944 | |
| 1945 | ssh_signal(SIGHUP1, sighup_handler); |
| 1946 | ssh_signal(SIGCHLD20, main_sigchld_handler); |
| 1947 | ssh_signal(SIGTERM15, sigterm_handler); |
| 1948 | ssh_signal(SIGQUIT3, sigterm_handler); |
| 1949 | |
| 1950 | /* |
| 1951 | * Write out the pid file after the sigterm handler |
| 1952 | * is setup and the listen sockets are bound |
| 1953 | */ |
| 1954 | if (options.pid_file != NULL((void *)0) && !debug_flag) { |
| 1955 | FILE *f = fopen(options.pid_file, "w"); |
| 1956 | |
| 1957 | if (f == NULL((void *)0)) { |
| 1958 | error("Couldn't create pid file \"%s\": %s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1959, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Couldn't create pid file \"%s\": %s" , options.pid_file, strerror((*__errno()))) |
| 1959 | options.pid_file, strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1959, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Couldn't create pid file \"%s\": %s" , options.pid_file, strerror((*__errno()))); |
| 1960 | } else { |
| 1961 | fprintf(f, "%ld\n", (long) getpid()); |
| 1962 | fclose(f); |
| 1963 | } |
| 1964 | } |
| 1965 | |
| 1966 | /* Accept a connection and return in a forked child */ |
| 1967 | server_accept_loop(&sock_in, &sock_out, |
| 1968 | &newsock, config_s); |
| 1969 | } |
| 1970 | |
| 1971 | /* This is the child processing a new connection. */ |
| 1972 | setproctitle("%s", "[accepted]"); |
| 1973 | |
| 1974 | /* |
| 1975 | * Create a new session and process group since the 4.4BSD |
| 1976 | * setlogin() affects the entire process group. We don't |
| 1977 | * want the child to be able to affect the parent. |
| 1978 | */ |
| 1979 | if (!debug_flag && !inetd_flag && setsid() == -1) |
| 1980 | error("setsid: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1980, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "setsid: %.100s", strerror ((*__errno()))); |
| 1981 | |
| 1982 | if (rexec_flag) { |
| 1983 | debug("rexec start in %d out %d newsock %d pipe %d sock %d",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1984, 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]) |
| 1984 | sock_in, sock_out, newsock, startup_pipe, config_s[0])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1984, 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]); |
| 1985 | if (dup2(newsock, STDIN_FILENO0) == -1) |
| 1986 | debug3_f("dup2 stdin: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1986, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "dup2 stdin: %s", strerror ((*__errno()))); |
| 1987 | if (dup2(STDIN_FILENO0, STDOUT_FILENO1) == -1) |
| 1988 | debug3_f("dup2 stdout: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1988, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "dup2 stdout: %s", strerror ((*__errno()))); |
| 1989 | if (startup_pipe == -1) |
| 1990 | close(REEXEC_STARTUP_PIPE_FD(2 + 2)); |
| 1991 | else if (startup_pipe != REEXEC_STARTUP_PIPE_FD(2 + 2)) { |
| 1992 | if (dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD(2 + 2)) == -1) |
| 1993 | debug3_f("dup2 startup_p: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1993, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "dup2 startup_p: %s", strerror ((*__errno()))); |
| 1994 | close(startup_pipe); |
| 1995 | startup_pipe = REEXEC_STARTUP_PIPE_FD(2 + 2); |
| 1996 | } |
| 1997 | |
| 1998 | if (dup2(config_s[1], REEXEC_CONFIG_PASS_FD(2 + 3)) == -1) |
| 1999 | debug3_f("dup2 config_s: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 1999, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "dup2 config_s: %s", strerror ((*__errno()))); |
| 2000 | close(config_s[1]); |
| 2001 | |
| 2002 | ssh_signal(SIGHUP1, SIG_IGN(void (*)(int))1); /* avoid reset to SIG_DFL */ |
| 2003 | execv(rexec_argv[0], rexec_argv); |
| 2004 | |
| 2005 | /* Reexec has failed, fall back and continue */ |
| 2006 | error("rexec of %s failed: %s", rexec_argv[0], strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2006, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "rexec of %s failed: %s" , rexec_argv[0], strerror((*__errno()))); |
| 2007 | recv_rexec_state(REEXEC_CONFIG_PASS_FD(2 + 3), NULL((void *)0)); |
| 2008 | log_init(__progname, options.log_level, |
| 2009 | options.log_facility, log_stderr); |
| 2010 | |
| 2011 | /* Clean up fds */ |
| 2012 | close(REEXEC_CONFIG_PASS_FD(2 + 3)); |
| 2013 | newsock = sock_out = sock_in = dup(STDIN_FILENO0); |
| 2014 | if (stdfd_devnull(1, 1, 0) == -1) |
| 2015 | error_f("stdfd_devnull failed")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2015, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "stdfd_devnull failed"); |
| 2016 | debug("rexec cleanup in %d out %d newsock %d pipe %d sock %d",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2017, 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]) |
| 2017 | sock_in, sock_out, newsock, startup_pipe, config_s[0])sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2017, 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]); |
| 2018 | } |
| 2019 | |
| 2020 | /* Executed child processes don't need these. */ |
| 2021 | fcntl(sock_out, F_SETFD2, FD_CLOEXEC1); |
| 2022 | fcntl(sock_in, F_SETFD2, FD_CLOEXEC1); |
| 2023 | |
| 2024 | /* We will not restart on SIGHUP since it no longer makes sense. */ |
| 2025 | ssh_signal(SIGALRM14, SIG_DFL(void (*)(int))0); |
| 2026 | ssh_signal(SIGHUP1, SIG_DFL(void (*)(int))0); |
| 2027 | ssh_signal(SIGTERM15, SIG_DFL(void (*)(int))0); |
| 2028 | ssh_signal(SIGQUIT3, SIG_DFL(void (*)(int))0); |
| 2029 | ssh_signal(SIGCHLD20, SIG_DFL(void (*)(int))0); |
| 2030 | |
| 2031 | /* |
| 2032 | * Register our connection. This turns encryption off because we do |
| 2033 | * not have a key. |
| 2034 | */ |
| 2035 | if ((ssh = ssh_packet_set_connection(NULL((void *)0), sock_in, sock_out)) == NULL((void *)0)) |
| 2036 | fatal("Unable to create connection")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2036 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Unable to create connection" ); |
| 2037 | the_active_state = ssh; |
| 2038 | ssh_packet_set_server(ssh); |
| 2039 | |
| 2040 | check_ip_options(ssh); |
| 2041 | |
| 2042 | /* Prepare the channels layer */ |
| 2043 | channel_init_channels(ssh); |
| 2044 | channel_set_af(ssh, options.address_family); |
| 2045 | process_channel_timeouts(ssh, &options); |
| 2046 | process_permitopen(ssh, &options); |
| 2047 | |
| 2048 | /* Set SO_KEEPALIVE if requested. */ |
| 2049 | if (options.tcp_keep_alive && ssh_packet_connection_is_on_socket(ssh) && |
| 2050 | setsockopt(sock_in, SOL_SOCKET0xffff, SO_KEEPALIVE0x0008, &on, sizeof(on)) == -1) |
| 2051 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2051, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "setsockopt SO_KEEPALIVE: %.100s" , strerror((*__errno()))); |
| 2052 | |
| 2053 | if ((remote_port = ssh_remote_port(ssh)) < 0) { |
| 2054 | debug("ssh_remote_port failed")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2054, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ssh_remote_port failed" ); |
| 2055 | cleanup_exit(255); |
| 2056 | } |
| 2057 | |
| 2058 | /* |
| 2059 | * The rest of the code depends on the fact that |
| 2060 | * ssh_remote_ipaddr() caches the remote ip, even if |
| 2061 | * the socket goes away. |
| 2062 | */ |
| 2063 | remote_ip = ssh_remote_ipaddr(ssh); |
| 2064 | |
| 2065 | rdomain = ssh_packet_rdomain_in(ssh); |
| 2066 | |
| 2067 | /* Log the connection. */ |
| 2068 | laddr = get_local_ipaddr(sock_in); |
| 2069 | verbose("Connection from %s port %d on %s port %d%s%s%s",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2073, 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) ? "" : "\"") |
| 2070 | remote_ip, remote_port, laddr, ssh_local_port(ssh),sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2073, 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) ? "" : "\"") |
| 2071 | rdomain == NULL ? "" : " rdomain \"",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2073, 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) ? "" : "\"") |
| 2072 | rdomain == NULL ? "" : rdomain,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2073, 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) ? "" : "\"") |
| 2073 | rdomain == NULL ? "" : "\"")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2073, 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) ? "" : "\""); |
| 2074 | free(laddr); |
| 2075 | |
| 2076 | /* |
| 2077 | * We don't want to listen forever unless the other side |
| 2078 | * successfully authenticates itself. So we set up an alarm which is |
| 2079 | * cleared after successful authentication. A limit of zero |
| 2080 | * indicates no limit. Note that we don't set the alarm in debugging |
| 2081 | * mode; it is just annoying to have the server exit just when you |
| 2082 | * are about to discover the bug. |
| 2083 | */ |
| 2084 | ssh_signal(SIGALRM14, grace_alarm_handler); |
| 2085 | if (!debug_flag) |
| 2086 | alarm(options.login_grace_time); |
| 2087 | |
| 2088 | if ((r = kex_exchange_identification(ssh, -1, |
| 2089 | options.version_addendum)) != 0) |
| 2090 | sshpkt_fatal(ssh, r, "banner exchange"); |
| 2091 | |
| 2092 | ssh_packet_set_nonblocking(ssh); |
| 2093 | |
| 2094 | /* allocate authentication context */ |
| 2095 | authctxt = xcalloc(1, sizeof(*authctxt)); |
| 2096 | ssh->authctxt = authctxt; |
| 2097 | |
| 2098 | /* XXX global for cleanup, access from other modules */ |
| 2099 | the_authctxt = authctxt; |
| 2100 | |
| 2101 | /* Set default key authentication options */ |
| 2102 | if ((auth_opts = sshauthopt_new_with_keys_defaults()) == NULL((void *)0)) |
| 2103 | fatal("allocation failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2103 , 0, SYSLOG_LEVEL_FATAL, ((void *)0), "allocation failed"); |
| 2104 | |
| 2105 | /* prepare buffer to collect messages to display to user after login */ |
| 2106 | if ((loginmsg = sshbuf_new()) == NULL((void *)0)) |
| 2107 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2107 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed"); |
| 2108 | auth_debug_reset(); |
| 2109 | |
| 2110 | if (use_privsep) { |
| 2111 | if (privsep_preauth(ssh) == 1) |
| 2112 | goto authenticated; |
| 2113 | } else if (have_agent) { |
| 2114 | if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) { |
| 2115 | error_r(r, "Unable to get agent socket")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2115, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Unable to get agent socket" ); |
| 2116 | have_agent = 0; |
| 2117 | } |
| 2118 | } |
| 2119 | |
| 2120 | /* perform the key exchange */ |
| 2121 | /* authenticate user and start session */ |
| 2122 | do_ssh2_kex(ssh); |
| 2123 | do_authentication2(ssh); |
| 2124 | |
| 2125 | /* |
| 2126 | * If we use privilege separation, the unprivileged child transfers |
| 2127 | * the current keystate and exits |
| 2128 | */ |
| 2129 | if (use_privsep) { |
| 2130 | mm_send_keystate(ssh, pmonitor); |
| 2131 | ssh_packet_clear_keys(ssh); |
| 2132 | exit(0); |
| 2133 | } |
| 2134 | |
| 2135 | authenticated: |
| 2136 | /* |
| 2137 | * Cancel the alarm we set to limit the time taken for |
| 2138 | * authentication. |
| 2139 | */ |
| 2140 | alarm(0); |
| 2141 | ssh_signal(SIGALRM14, SIG_DFL(void (*)(int))0); |
| 2142 | authctxt->authenticated = 1; |
| 2143 | if (startup_pipe != -1) { |
| 2144 | close(startup_pipe); |
| 2145 | startup_pipe = -1; |
| 2146 | } |
| 2147 | |
| 2148 | if (options.routing_domain != NULL((void *)0)) |
| 2149 | set_process_rdomain(ssh, options.routing_domain); |
| 2150 | |
| 2151 | /* |
| 2152 | * In privilege separation, we fork another child and prepare |
| 2153 | * file descriptor passing. |
| 2154 | */ |
| 2155 | if (use_privsep) { |
| 2156 | privsep_postauth(ssh, authctxt); |
| 2157 | /* the monitor process [priv] will not return */ |
| 2158 | } |
| 2159 | |
| 2160 | ssh_packet_set_timeout(ssh, options.client_alive_interval, |
| 2161 | options.client_alive_count_max); |
| 2162 | |
| 2163 | /* Try to send all our hostkeys to the client */ |
| 2164 | notify_hostkeys(ssh); |
| 2165 | |
| 2166 | /* Start session. */ |
| 2167 | do_authenticated(ssh, authctxt); |
| 2168 | |
| 2169 | /* The connection has been terminated. */ |
| 2170 | ssh_packet_get_bytes(ssh, &ibytes, &obytes); |
| 2171 | verbose("Transferred: sent %llu, received %llu bytes",sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2172, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Transferred: sent %llu, received %llu bytes" , (unsigned long long)obytes, (unsigned long long)ibytes) |
| 2172 | (unsigned long long)obytes, (unsigned long long)ibytes)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2172, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Transferred: sent %llu, received %llu bytes" , (unsigned long long)obytes, (unsigned long long)ibytes); |
| 2173 | |
| 2174 | verbose("Closing connection to %.500s port %d", remote_ip, remote_port)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2174, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Closing connection to %.500s port %d" , remote_ip, remote_port); |
| 2175 | ssh_packet_close(ssh); |
| 2176 | |
| 2177 | if (use_privsep) |
| 2178 | mm_terminate(); |
| 2179 | |
| 2180 | exit(0); |
| 2181 | } |
| 2182 | |
| 2183 | int |
| 2184 | sshd_hostkey_sign(struct ssh *ssh, struct sshkey *privkey, |
| 2185 | struct sshkey *pubkey, u_char **signature, size_t *slenp, |
| 2186 | const u_char *data, size_t dlen, const char *alg) |
| 2187 | { |
| 2188 | int r; |
| 2189 | |
| 2190 | if (use_privsep) { |
| 2191 | if (privkey) { |
| 2192 | if (mm_sshkey_sign(ssh, privkey, signature, slenp, |
| 2193 | data, dlen, alg, options.sk_provider, NULL((void *)0), |
| 2194 | ssh->compat) < 0) |
| 2195 | fatal_f("privkey sign failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2195 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "privkey sign failed"); |
| 2196 | } else { |
| 2197 | if (mm_sshkey_sign(ssh, pubkey, signature, slenp, |
| 2198 | data, dlen, alg, options.sk_provider, NULL((void *)0), |
| 2199 | ssh->compat) < 0) |
| 2200 | fatal_f("pubkey sign failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2200 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pubkey sign failed"); |
| 2201 | } |
| 2202 | } else { |
| 2203 | if (privkey) { |
| 2204 | if (sshkey_sign(privkey, signature, slenp, data, dlen, |
| 2205 | alg, options.sk_provider, NULL((void *)0), ssh->compat) < 0) |
| 2206 | fatal_f("privkey sign failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2206 , 1, SYSLOG_LEVEL_FATAL, ((void *)0), "privkey sign failed"); |
| 2207 | } else { |
| 2208 | if ((r = ssh_agent_sign(auth_sock, pubkey, |
| 2209 | signature, slenp, data, dlen, alg, |
| 2210 | ssh->compat)) != 0) { |
| 2211 | fatal_fr(r, "agent sign failed")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2211 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "agent sign failed"); |
| 2212 | } |
| 2213 | } |
| 2214 | } |
| 2215 | return 0; |
| 2216 | } |
| 2217 | |
| 2218 | /* SSH2 key exchange */ |
| 2219 | static void |
| 2220 | do_ssh2_kex(struct ssh *ssh) |
| 2221 | { |
| 2222 | char *hkalgs = NULL((void *)0), *myproposal[PROPOSAL_MAX]; |
| 2223 | const char *compression = NULL((void *)0); |
| 2224 | struct kex *kex; |
| 2225 | int r; |
| 2226 | |
| 2227 | if (options.rekey_limit || options.rekey_interval) |
| 2228 | ssh_packet_set_rekey_limits(ssh, options.rekey_limit, |
| 2229 | options.rekey_interval); |
| 2230 | |
| 2231 | if (options.compression == COMP_NONE0) |
| 2232 | compression = "none"; |
| 2233 | hkalgs = list_hostkey_types(); |
| 2234 | |
| 2235 | kex_proposal_populate_entries(ssh, myproposal, options.kex_algorithms, |
| 2236 | options.ciphers, options.macs, compression, hkalgs); |
| 2237 | |
| 2238 | free(hkalgs); |
| 2239 | |
| 2240 | /* start key exchange */ |
| 2241 | if ((r = kex_setup(ssh, myproposal)) != 0) |
| 2242 | fatal_r(r, "kex_setup")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2242 , 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "kex_setup"); |
| 2243 | kex_set_server_sig_algs(ssh, options.pubkey_accepted_algos); |
| 2244 | kex = ssh->kex; |
| 2245 | |
| 2246 | #ifdef WITH_OPENSSL1 |
| 2247 | kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_server; |
| 2248 | kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_server; |
| 2249 | kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_server; |
| 2250 | kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_server; |
| 2251 | kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_server; |
| 2252 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
| 2253 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
| 2254 | kex->kex[KEX_ECDH_SHA2] = kex_gen_server; |
| 2255 | #endif |
| 2256 | kex->kex[KEX_C25519_SHA256] = kex_gen_server; |
| 2257 | kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_server; |
| 2258 | kex->load_host_public_key=&get_hostkey_public_by_type; |
| 2259 | kex->load_host_private_key=&get_hostkey_private_by_type; |
| 2260 | kex->host_key_index=&get_hostkey_index; |
| 2261 | kex->sign = sshd_hostkey_sign; |
| 2262 | |
| 2263 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &kex->done); |
| 2264 | kex_proposal_free_entries(myproposal); |
| 2265 | |
| 2266 | #ifdef DEBUG_KEXDH |
| 2267 | /* send 1st encrypted/maced/compressed message */ |
| 2268 | if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE2)) != 0 || |
| 2269 | (r = sshpkt_put_cstring(ssh, "markus")) != 0 || |
| 2270 | (r = sshpkt_send(ssh)) != 0 || |
| 2271 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 2272 | fatal_fr(r, "send test")sshfatal("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2272 , 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send test"); |
| 2273 | #endif |
| 2274 | debug("KEX done")sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2274, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "KEX done"); |
| 2275 | } |
| 2276 | |
| 2277 | /* server specific fatal cleanup */ |
| 2278 | void |
| 2279 | cleanup_exit(int i) |
| 2280 | { |
| 2281 | if (the_active_state != NULL((void *)0) && the_authctxt != NULL((void *)0)) { |
| 2282 | do_cleanup(the_active_state, the_authctxt); |
| 2283 | if (use_privsep && privsep_is_preauth && |
| 2284 | pmonitor != NULL((void *)0) && pmonitor->m_pid > 1) { |
| 2285 | debug("Killing privsep child %d", pmonitor->m_pid)sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2285, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Killing privsep child %d" , pmonitor->m_pid); |
| 2286 | if (kill(pmonitor->m_pid, SIGKILL9) != 0 && |
| 2287 | errno(*__errno()) != ESRCH3) { |
| 2288 | error_f("kill(%d): %s", pmonitor->m_pid,sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2289, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "kill(%d): %s", pmonitor ->m_pid, strerror((*__errno()))) |
| 2289 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/sshd/../sshd.c", __func__, 2289, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "kill(%d): %s", pmonitor ->m_pid, strerror((*__errno()))); |
| 2290 | } |
| 2291 | } |
| 2292 | } |
| 2293 | _exit(i); |
| 2294 | } |