1 0 stevel /* 2 0 stevel * Author: Tatu Ylonen <ylo (at) cs.hut.fi> 3 0 stevel * Copyright (c) 1995 Tatu Ylonen <ylo (at) cs.hut.fi>, Espoo, Finland 4 0 stevel * All rights reserved 5 0 stevel * This program is the ssh daemon. It listens for connections from clients, 6 0 stevel * and performs authentication, executes use commands or shell, and forwards 7 0 stevel * information to/from the application to the user client over an encrypted 8 0 stevel * connection. This can also handle forwarding of X11, TCP/IP, and 9 0 stevel * authentication agent connections. 10 0 stevel * 11 0 stevel * As far as I am concerned, the code I have written for this software 12 0 stevel * can be used freely for any purpose. Any derived versions of this 13 0 stevel * software must be clearly marked as such, and if the derived work is 14 0 stevel * incompatible with the protocol description in the RFC file, it must be 15 0 stevel * called by a name other than "ssh" or "Secure Shell". 16 0 stevel * 17 0 stevel * SSH2 implementation: 18 0 stevel * Privilege Separation: 19 0 stevel * 20 0 stevel * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved. 21 0 stevel * Copyright (c) 2002 Niels Provos. All rights reserved. 22 0 stevel * 23 0 stevel * Redistribution and use in source and binary forms, with or without 24 0 stevel * modification, are permitted provided that the following conditions 25 0 stevel * are met: 26 0 stevel * 1. Redistributions of source code must retain the above copyright 27 0 stevel * notice, this list of conditions and the following disclaimer. 28 0 stevel * 2. Redistributions in binary form must reproduce the above copyright 29 0 stevel * notice, this list of conditions and the following disclaimer in the 30 0 stevel * documentation and/or other materials provided with the distribution. 31 0 stevel * 32 0 stevel * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 33 0 stevel * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 34 0 stevel * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 35 0 stevel * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 36 0 stevel * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 37 0 stevel * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 38 0 stevel * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 39 0 stevel * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 40 0 stevel * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 41 0 stevel * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 42 0 stevel */ 43 0 stevel /* 44 8658 Jan * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 45 0 stevel * Use is subject to license terms. 46 0 stevel */ 47 0 stevel 48 0 stevel #include "includes.h" 49 0 stevel RCSID("$OpenBSD: sshd.c,v 1.260 2002/09/27 10:42:09 mickey Exp $"); 50 0 stevel 51 0 stevel #include <openssl/dh.h> 52 0 stevel #include <openssl/bn.h> 53 0 stevel #include <openssl/md5.h> 54 0 stevel 55 0 stevel #include <openssl/rand.h> 56 0 stevel 57 0 stevel #include "ssh.h" 58 0 stevel #include "ssh1.h" 59 0 stevel #include "ssh2.h" 60 0 stevel #include "xmalloc.h" 61 0 stevel #include "rsa.h" 62 0 stevel #include "sshpty.h" 63 0 stevel #include "packet.h" 64 0 stevel #include "mpaux.h" 65 0 stevel #include "log.h" 66 0 stevel #include "servconf.h" 67 0 stevel #include "uidswap.h" 68 0 stevel #include "compat.h" 69 0 stevel #include "buffer.h" 70 0 stevel #include "cipher.h" 71 0 stevel #include "kex.h" 72 0 stevel #include "key.h" 73 0 stevel #include "dh.h" 74 0 stevel #include "myproposal.h" 75 0 stevel #include "authfile.h" 76 0 stevel #include "pathnames.h" 77 0 stevel #include "atomicio.h" 78 0 stevel #include "canohost.h" 79 0 stevel #include "auth.h" 80 0 stevel #include "misc.h" 81 0 stevel #include "dispatch.h" 82 0 stevel #include "channels.h" 83 0 stevel #include "session.h" 84 0 stevel #include "g11n.h" 85 0 stevel #include "sshlogin.h" 86 0 stevel #include "xlist.h" 87 7574 Jan #include "engine.h" 88 0 stevel 89 0 stevel #ifdef HAVE_BSM 90 0 stevel #include "bsmaudit.h" 91 0 stevel #endif /* HAVE_BSM */ 92 0 stevel 93 0 stevel #ifdef ALTPRIVSEP 94 0 stevel #include "altprivsep.h" 95 0 stevel #endif /* ALTPRIVSEP */ 96 0 stevel 97 0 stevel #ifdef HAVE_SOLARIS_CONTRACTS 98 0 stevel #include <sys/ctfs.h> 99 0 stevel #include <sys/contract.h> 100 0 stevel #include <sys/contract/process.h> 101 0 stevel #include <libcontract.h> 102 0 stevel #endif /* HAVE_SOLARIS_CONTRACTS */ 103 0 stevel 104 0 stevel #ifdef GSSAPI 105 0 stevel #include "ssh-gss.h" 106 0 stevel #endif /* GSSAPI */ 107 0 stevel 108 0 stevel #ifdef LIBWRAP 109 0 stevel #include <tcpd.h> 110 0 stevel #include <syslog.h> 111 0 stevel #ifndef lint 112 0 stevel int allow_severity = LOG_INFO; 113 0 stevel int deny_severity = LOG_WARNING; 114 0 stevel #endif /* lint */ 115 0 stevel #endif /* LIBWRAP */ 116 0 stevel 117 0 stevel #ifndef O_NOCTTY 118 0 stevel #define O_NOCTTY 0 119 0 stevel #endif 120 0 stevel 121 0 stevel #ifdef HAVE___PROGNAME 122 0 stevel extern char *__progname; 123 0 stevel #else 124 0 stevel char *__progname; 125 0 stevel #endif 126 0 stevel 127 0 stevel /* Server configuration options. */ 128 0 stevel ServerOptions options; 129 0 stevel 130 0 stevel /* Name of the server configuration file. */ 131 0 stevel static char *config_file_name = _PATH_SERVER_CONFIG_FILE; 132 0 stevel 133 0 stevel /* 134 0 stevel * Flag indicating whether IPv4 or IPv6. This can be set on the command line. 135 0 stevel * Default value is AF_UNSPEC means both IPv4 and IPv6. 136 0 stevel */ 137 0 stevel #ifdef IPV4_DEFAULT 138 0 stevel int IPv4or6 = AF_INET; 139 0 stevel #else 140 0 stevel int IPv4or6 = AF_UNSPEC; 141 0 stevel #endif 142 0 stevel 143 0 stevel /* 144 0 stevel * Debug mode flag. This can be set on the command line. If debug 145 0 stevel * mode is enabled, extra debugging output will be sent to the system 146 0 stevel * log, the daemon will not go to background, and will exit after processing 147 0 stevel * the first connection. 148 0 stevel */ 149 0 stevel int debug_flag = 0; 150 0 stevel 151 0 stevel /* Flag indicating that the daemon should only test the configuration and keys. */ 152 0 stevel static int test_flag = 0; 153 0 stevel 154 0 stevel /* Flag indicating that the daemon is being started from inetd. */ 155 0 stevel static int inetd_flag = 0; 156 0 stevel 157 0 stevel /* Flag indicating that sshd should not detach and become a daemon. */ 158 0 stevel static int no_daemon_flag = 0; 159 0 stevel 160 0 stevel /* debug goes to stderr unless inetd_flag is set */ 161 0 stevel int log_stderr = 0; 162 0 stevel 163 0 stevel /* Saved arguments to main(). */ 164 0 stevel static char **saved_argv; 165 0 stevel static int saved_argc; 166 0 stevel 167 0 stevel /* 168 0 stevel * The sockets that the server is listening; this is used in the SIGHUP 169 0 stevel * signal handler. 170 0 stevel */ 171 0 stevel #define MAX_LISTEN_SOCKS 16 172 0 stevel static int listen_socks[MAX_LISTEN_SOCKS]; 173 0 stevel static int num_listen_socks = 0; 174 0 stevel 175 0 stevel /* 176 0 stevel * the client's version string, passed by sshd2 in compat mode. if != NULL, 177 0 stevel * sshd will skip the version-number exchange 178 0 stevel */ 179 0 stevel static char *client_version_string = NULL; 180 0 stevel static char *server_version_string = NULL; 181 0 stevel 182 0 stevel /* for rekeying XXX fixme */ 183 0 stevel Kex *xxx_kex; 184 0 stevel 185 0 stevel /* 186 0 stevel * Any really sensitive data in the application is contained in this 187 0 stevel * structure. The idea is that this structure could be locked into memory so 188 0 stevel * that the pages do not get written into swap. However, there are some 189 0 stevel * problems. The private key contains BIGNUMs, and we do not (in principle) 190 0 stevel * have access to the internals of them, and locking just the structure is 191 0 stevel * not very useful. Currently, memory locking is not implemented. 192 0 stevel */ 193 0 stevel static struct { 194 0 stevel Key *server_key; /* ephemeral server key */ 195 0 stevel Key *ssh1_host_key; /* ssh1 host key */ 196 0 stevel Key **host_keys; /* all private host keys */ 197 0 stevel int have_ssh1_key; 198 0 stevel int have_ssh2_key; 199 0 stevel u_char ssh1_cookie[SSH_SESSION_KEY_LENGTH]; 200 0 stevel } sensitive_data; 201 0 stevel 202 0 stevel /* 203 0 stevel * Flag indicating whether the RSA server key needs to be regenerated. 204 0 stevel * Is set in the SIGALRM handler and cleared when the key is regenerated. 205 0 stevel */ 206 0 stevel static volatile sig_atomic_t key_do_regen = 0; 207 0 stevel 208 0 stevel /* This is set to true when a signal is received. */ 209 0 stevel static volatile sig_atomic_t received_sighup = 0; 210 0 stevel static volatile sig_atomic_t received_sigterm = 0; 211 0 stevel 212 0 stevel /* session identifier, used by RSA-auth */ 213 0 stevel u_char session_id[16]; 214 0 stevel 215 0 stevel /* same for ssh2 */ 216 0 stevel u_char *session_id2 = NULL; 217 0 stevel int session_id2_len = 0; 218 0 stevel 219 0 stevel /* record remote hostname or ip */ 220 0 stevel u_int utmp_len = MAXHOSTNAMELEN; 221 0 stevel 222 0 stevel /* options.max_startup sized array of fd ints */ 223 0 stevel static int *startup_pipes = NULL; 224 0 stevel static int startup_pipe = -1; /* in child */ 225 11044 Huie-Ying 226 11044 Huie-Ying /* sshd_config buffer */ 227 11044 Huie-Ying Buffer cfg; 228 0 stevel 229 0 stevel #ifdef GSSAPI 230 0 stevel static gss_OID_set mechs = GSS_C_NULL_OID_SET; 231 0 stevel #endif /* GSSAPI */ 232 0 stevel 233 0 stevel /* Prototypes for various functions defined later in this file. */ 234 0 stevel void destroy_sensitive_data(void); 235 0 stevel static void demote_sensitive_data(void); 236 0 stevel 237 0 stevel static void do_ssh1_kex(void); 238 0 stevel static void do_ssh2_kex(void); 239 0 stevel 240 0 stevel /* 241 0 stevel * Close all listening sockets 242 0 stevel */ 243 0 stevel static void 244 0 stevel close_listen_socks(void) 245 0 stevel { 246 0 stevel int i; 247 0 stevel 248 0 stevel for (i = 0; i < num_listen_socks; i++) 249 0 stevel (void) close(listen_socks[i]); 250 0 stevel num_listen_socks = -1; 251 0 stevel } 252 0 stevel 253 0 stevel static void 254 0 stevel close_startup_pipes(void) 255 0 stevel { 256 0 stevel int i; 257 0 stevel 258 0 stevel if (startup_pipes) 259 0 stevel for (i = 0; i < options.max_startups; i++) 260 0 stevel if (startup_pipes[i] != -1) 261 0 stevel (void) close(startup_pipes[i]); 262 0 stevel } 263 0 stevel 264 0 stevel /* 265 0 stevel * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP; 266 0 stevel * the effect is to reread the configuration file (and to regenerate 267 0 stevel * the server key). 268 0 stevel */ 269 0 stevel static void 270 0 stevel sighup_handler(int sig) 271 0 stevel { 272 0 stevel int save_errno = errno; 273 0 stevel 274 0 stevel received_sighup = 1; 275 0 stevel (void) signal(SIGHUP, sighup_handler); 276 0 stevel errno = save_errno; 277 0 stevel } 278 0 stevel 279 0 stevel /* 280 0 stevel * Called from the main program after receiving SIGHUP. 281 0 stevel * Restarts the server. 282 0 stevel */ 283 0 stevel static void 284 0 stevel sighup_restart(void) 285 0 stevel { 286 0 stevel log("Received SIGHUP; restarting."); 287 0 stevel close_listen_socks(); 288 0 stevel close_startup_pipes(); 289 0 stevel (void) execv(saved_argv[0], saved_argv); 290 0 stevel log("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0], 291 0 stevel strerror(errno)); 292 0 stevel exit(1); 293 0 stevel } 294 0 stevel 295 0 stevel /* 296 0 stevel * Generic signal handler for terminating signals in the master daemon. 297 0 stevel */ 298 0 stevel static void 299 0 stevel sigterm_handler(int sig) 300 0 stevel { 301 0 stevel received_sigterm = sig; 302 0 stevel } 303 0 stevel 304 0 stevel /* 305 0 stevel * SIGCHLD handler. This is called whenever a child dies. This will then 306 0 stevel * reap any zombies left by exited children. 307 0 stevel */ 308 0 stevel static void 309 0 stevel main_sigchld_handler(int sig) 310 0 stevel { 311 0 stevel int save_errno = errno; 312 0 stevel pid_t pid; 313 0 stevel int status; 314 0 stevel 315 0 stevel while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || 316 0 stevel (pid < 0 && errno == EINTR)) 317 0 stevel ; 318 0 stevel 319 0 stevel (void) signal(SIGCHLD, main_sigchld_handler); 320 0 stevel errno = save_errno; 321 0 stevel } 322 0 stevel 323 0 stevel /* 324 10515 Jan * Signal handler for the alarm after the login grace period has expired. This 325 10515 Jan * is for the (soon-to-be) unprivileged child only. The monitor gets an event on 326 10515 Jan * the communication pipe and exits as well. 327 0 stevel */ 328 0 stevel static void 329 0 stevel grace_alarm_handler(int sig) 330 0 stevel { 331 0 stevel /* Log error and exit. */ 332 10515 Jan fatal("Timeout before authentication for %.200s", get_remote_ipaddr()); 333 0 stevel } 334 0 stevel 335 0 stevel #ifdef HAVE_SOLARIS_CONTRACTS 336 0 stevel static int contracts_fd = -1; 337 0 stevel void 338 0 stevel contracts_pre_fork() 339 0 stevel { 340 0 stevel const char *during = "opening process contract template"; 341 0 stevel 342 0 stevel /* 343 0 stevel * Failure should not be treated as fatal on the theory that 344 0 stevel * it's better to start with children in the same contract as 345 0 stevel * the master listener than not at all. 346 0 stevel */ 347 0 stevel 348 0 stevel if (contracts_fd == -1) { 349 0 stevel if ((contracts_fd = open64(CTFS_ROOT "/process/template", 350 0 stevel O_RDWR)) == -1) 351 0 stevel goto cleanup; 352 0 stevel 353 0 stevel during = "setting sundry contract terms"; 354 0 stevel if ((errno = ct_pr_tmpl_set_param(contracts_fd, CT_PR_PGRPONLY))) 355 0 stevel goto cleanup; 356 0 stevel 357 0 stevel if ((errno = ct_tmpl_set_informative(contracts_fd, CT_PR_EV_HWERR))) 358 0 stevel goto cleanup; 359 0 stevel 360 0 stevel if ((errno = ct_pr_tmpl_set_fatal(contracts_fd, CT_PR_EV_HWERR))) 361 0 stevel goto cleanup; 362 0 stevel 363 0 stevel if ((errno = ct_tmpl_set_critical(contracts_fd, 0))) 364 0 stevel goto cleanup; 365 0 stevel } 366 0 stevel 367 0 stevel during = "setting active template"; 368 0 stevel if ((errno = ct_tmpl_activate(contracts_fd))) 369 0 stevel goto cleanup; 370 0 stevel 371 0 stevel debug3("Set active contract"); 372 0 stevel return; 373 0 stevel 374 0 stevel cleanup: 375 0 stevel if (contracts_fd != -1) 376 0 stevel (void) close(contracts_fd); 377 0 stevel 378 0 stevel contracts_fd = -1; 379 0 stevel 380 0 stevel if (errno) 381 0 stevel debug2("Error while trying to set up active contract" 382 0 stevel " template: %s while %s", strerror(errno), during); 383 0 stevel } 384 0 stevel 385 0 stevel void 386 0 stevel contracts_post_fork_child() 387 0 stevel { 388 0 stevel /* Clear active template so fork() creates no new contracts. */ 389 0 stevel 390 0 stevel if (contracts_fd == -1) 391 0 stevel return; 392 0 stevel 393 0 stevel if ((errno = (ct_tmpl_clear(contracts_fd)))) 394 0 stevel debug2("Error while trying to clear active contract template" 395 0 stevel " (child): %s", strerror(errno)); 396 0 stevel else 397 0 stevel debug3("Cleared active contract template (child)"); 398 0 stevel 399 0 stevel (void) close(contracts_fd); 400 0 stevel 401 0 stevel contracts_fd = -1; 402 0 stevel } 403 0 stevel 404 0 stevel void 405 0 stevel contracts_post_fork_parent(int fork_succeeded) 406 0 stevel { 407 0 stevel char path[PATH_MAX]; 408 0 stevel int cfd, n; 409 0 stevel ct_stathdl_t st; 410 0 stevel ctid_t latest; 411 0 stevel 412 0 stevel /* Clear active template, abandon latest contract. */ 413 0 stevel if (contracts_fd == -1) 414 0 stevel return; 415 0 stevel 416 0 stevel if ((errno = ct_tmpl_clear(contracts_fd))) 417 0 stevel debug2("Error while clearing active contract template: %s", 418 0 stevel strerror(errno)); 419 0 stevel else 420 0 stevel debug3("Cleared active contract template (parent)"); 421 0 stevel 422 0 stevel if (!fork_succeeded) 423 0 stevel return; 424 0 stevel 425 0 stevel if ((cfd = open64(CTFS_ROOT "/process/latest", O_RDONLY)) == -1) { 426 0 stevel debug2("Error while getting latest contract: %s", 427 0 stevel strerror(errno)); 428 0 stevel return; 429 0 stevel } 430 0 stevel 431 0 stevel if ((errno = ct_status_read(cfd, CTD_COMMON, &st)) != 0) { 432 0 stevel debug2("Error while getting latest contract ID: %s", 433 0 stevel strerror(errno)); 434 0 stevel (void) close(cfd); 435 0 stevel return; 436 0 stevel } 437 0 stevel 438 0 stevel latest = ct_status_get_id(st); 439 0 stevel ct_status_free(st); 440 0 stevel (void) close(cfd); 441 0 stevel 442 0 stevel n = snprintf(path, PATH_MAX, CTFS_ROOT "/all/%ld/ctl", latest); 443 0 stevel 444 0 stevel if (n >= PATH_MAX) { 445 0 stevel debug2("Error while opening the latest contract ctl file: %s", 446 0 stevel strerror(ENAMETOOLONG)); 447 0 stevel return; 448 0 stevel } 449 0 stevel 450 0 stevel if ((cfd = open64(path, O_WRONLY)) == -1) { 451 0 stevel debug2("Error while opening the latest contract ctl file: %s", 452 0 stevel strerror(errno)); 453 0 stevel return; 454 0 stevel } 455 0 stevel 456 0 stevel if ((errno = ct_ctl_abandon(cfd))) 457 0 stevel debug2("Error while abandoning latest contract: %s", 458 0 stevel strerror(errno)); 459 0 stevel else 460 0 stevel debug3("Abandoned latest contract"); 461 0 stevel 462 0 stevel (void) close(cfd); 463 0 stevel } 464 0 stevel #endif /* HAVE_SOLARIS_CONTRACTS */ 465 0 stevel 466 0 stevel /* 467 0 stevel * Signal handler for the key regeneration alarm. Note that this 468 0 stevel * alarm only occurs in the daemon waiting for connections, and it does not 469 0 stevel * do anything with the private key or random state before forking. 470 0 stevel * Thus there should be no concurrency control/asynchronous execution 471 0 stevel * problems. 472 0 stevel */ 473 0 stevel static void 474 0 stevel generate_ephemeral_server_key(void) 475 0 stevel { 476 0 stevel u_int32_t rnd = 0; 477 0 stevel int i; 478 0 stevel 479 0 stevel verbose("Generating %s%d bit RSA key.", 480 0 stevel sensitive_data.server_key ? "new " : "", options.server_key_bits); 481 0 stevel if (sensitive_data.server_key != NULL) 482 0 stevel key_free(sensitive_data.server_key); 483 0 stevel sensitive_data.server_key = key_generate(KEY_RSA1, 484 0 stevel options.server_key_bits); 485 0 stevel verbose("RSA key generation complete."); 486 0 stevel 487 0 stevel for (i = 0; i < SSH_SESSION_KEY_LENGTH; i++) { 488 0 stevel if (i % 4 == 0) 489 0 stevel rnd = arc4random(); 490 0 stevel sensitive_data.ssh1_cookie[i] = rnd & 0xff; 491 0 stevel rnd >>= 8; 492 0 stevel } 493 0 stevel arc4random_stir(); 494 0 stevel } 495 0 stevel 496 0 stevel static void 497 0 stevel key_regeneration_alarm(int sig) 498 0 stevel { 499 0 stevel int save_errno = errno; 500 0 stevel 501 0 stevel (void) signal(SIGALRM, SIG_DFL); 502 0 stevel errno = save_errno; 503 0 stevel key_do_regen = 1; 504 0 stevel } 505 0 stevel 506 0 stevel static void 507 0 stevel sshd_exchange_identification(int sock_in, int sock_out) 508 0 stevel { 509 0 stevel int i, mismatch; 510 0 stevel int remote_major, remote_minor; 511 0 stevel int major, minor; 512 0 stevel char *s; 513 0 stevel char buf[256]; /* Must not be larger than remote_version. */ 514 0 stevel char remote_version[256]; /* Must be at least as big as buf. */ 515 0 stevel 516 0 stevel if ((options.protocol & SSH_PROTO_1) && 517 0 stevel (options.protocol & SSH_PROTO_2)) { 518 0 stevel major = PROTOCOL_MAJOR_1; 519 0 stevel minor = 99; 520 0 stevel } else if (options.protocol & SSH_PROTO_2) { 521 0 stevel major = PROTOCOL_MAJOR_2; 522 0 stevel minor = PROTOCOL_MINOR_2; 523 0 stevel } else { 524 0 stevel major = PROTOCOL_MAJOR_1; 525 0 stevel minor = PROTOCOL_MINOR_1; 526 0 stevel } 527 0 stevel (void) snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", major, minor, SSH_VERSION); 528 0 stevel server_version_string = xstrdup(buf); 529 0 stevel 530 0 stevel if (client_version_string == NULL) { 531 0 stevel /* Send our protocol version identification. */ 532 0 stevel if (atomicio(write, sock_out, server_version_string, 533 0 stevel strlen(server_version_string)) 534 0 stevel != strlen(server_version_string)) { 535 0 stevel log("Could not write ident string to %s", get_remote_ipaddr()); 536 0 stevel fatal_cleanup(); 537 0 stevel } 538 0 stevel 539 0 stevel /* Read other sides version identification. */ 540 0 stevel (void) memset(buf, 0, sizeof(buf)); 541 0 stevel for (i = 0; i < sizeof(buf) - 1; i++) { 542 0 stevel if (atomicio(read, sock_in, &buf[i], 1) != 1) { 543 0 stevel log("Did not receive identification string from %s", 544 0 stevel get_remote_ipaddr()); 545 0 stevel fatal_cleanup(); 546 0 stevel } 547 0 stevel if (buf[i] == '\r') { 548 0 stevel buf[i] = 0; 549 0 stevel /* Kludge for F-Secure Macintosh < 1.0.2 */ 550 0 stevel if (i == 12 && 551 0 stevel strncmp(buf, "SSH-1.5-W1.0", 12) == 0) 552 0 stevel break; 553 0 stevel continue; 554 0 stevel } 555 0 stevel if (buf[i] == '\n') { 556 0 stevel buf[i] = 0; 557 0 stevel break; 558 0 stevel } 559 0 stevel } 560 0 stevel buf[sizeof(buf) - 1] = 0; 561 0 stevel client_version_string = xstrdup(buf); 562 0 stevel } 563 0 stevel 564 0 stevel /* 565 0 stevel * Check that the versions match. In future this might accept 566 0 stevel * several versions and set appropriate flags to handle them. 567 0 stevel */ 568 0 stevel if (sscanf(client_version_string, "SSH-%d.%d-%[^\n]\n", 569 0 stevel &remote_major, &remote_minor, remote_version) != 3) { 570 0 stevel s = "Protocol mismatch.\n"; 571 0 stevel (void) atomicio(write, sock_out, s, strlen(s)); 572 0 stevel (void) close(sock_in); 573 0 stevel (void) close(sock_out); 574 0 stevel log("Bad protocol version identification '%.100s' from %s", 575 0 stevel client_version_string, get_remote_ipaddr()); 576 0 stevel fatal_cleanup(); 577 0 stevel } 578 0 stevel debug("Client protocol version %d.%d; client software version %.100s", 579 0 stevel remote_major, remote_minor, remote_version); 580 0 stevel 581 0 stevel compat_datafellows(remote_version); 582 0 stevel 583 0 stevel if (datafellows & SSH_BUG_PROBE) { 584 0 stevel log("probed from %s with %s. Don't panic.", 585 0 stevel get_remote_ipaddr(), client_version_string); 586 0 stevel fatal_cleanup(); 587 0 stevel } 588 0 stevel 589 0 stevel if (datafellows & SSH_BUG_SCANNER) { 590 0 stevel log("scanned from %s with %s. Don't panic.", 591 0 stevel get_remote_ipaddr(), client_version_string); 592 0 stevel fatal_cleanup(); 593 0 stevel } 594 0 stevel 595 0 stevel mismatch = 0; 596 0 stevel switch (remote_major) { 597 0 stevel case 1: 598 0 stevel if (remote_minor == 99) { 599 0 stevel if (options.protocol & SSH_PROTO_2) 600 0 stevel enable_compat20(); 601 0 stevel else 602 0 stevel mismatch = 1; 603 0 stevel break; 604 0 stevel } 605 0 stevel if (!(options.protocol & SSH_PROTO_1)) { 606 0 stevel mismatch = 1; 607 0 stevel break; 608 0 stevel } 609 0 stevel if (remote_minor < 3) { 610 0 stevel packet_disconnect("Your ssh version is too old and " 611 0 stevel "is no longer supported. Please install a newer version."); 612 0 stevel } else if (remote_minor == 3) { 613 0 stevel /* note that this disables agent-forwarding */ 614 0 stevel enable_compat13(); 615 0 stevel } 616 0 stevel break; 617 0 stevel case 2: 618 0 stevel if (options.protocol & SSH_PROTO_2) { 619 0 stevel enable_compat20(); 620 0 stevel break; 621 0 stevel } 622 0 stevel /* FALLTHROUGH */ 623 0 stevel default: 624 0 stevel mismatch = 1; 625 0 stevel break; 626 0 stevel } 627 0 stevel chop(server_version_string); 628 0 stevel debug("Local version string %.200s", server_version_string); 629 0 stevel 630 0 stevel if (mismatch) { 631 0 stevel s = "Protocol major versions differ.\n"; 632 0 stevel (void) atomicio(write, sock_out, s, strlen(s)); 633 0 stevel (void) close(sock_in); 634 0 stevel (void) close(sock_out); 635 0 stevel log("Protocol major versions differ for %s: %.200s vs. %.200s", 636 0 stevel get_remote_ipaddr(), 637 0 stevel server_version_string, client_version_string); 638 0 stevel fatal_cleanup(); 639 0 stevel } 640 0 stevel } 641 0 stevel 642 0 stevel /* Destroy the host and server keys. They will no longer be needed. */ 643 0 stevel void 644 0 stevel destroy_sensitive_data(void) 645 0 stevel { 646 0 stevel int i; 647 0 stevel 648 0 stevel if (sensitive_data.server_key) { 649 0 stevel key_free(sensitive_data.server_key); 650 0 stevel sensitive_data.server_key = NULL; 651 0 stevel } 652 0 stevel for (i = 0; i < options.num_host_key_files; i++) { 653 0 stevel if (sensitive_data.host_keys[i]) { 654 0 stevel key_free(sensitive_data.host_keys[i]); 655 0 stevel sensitive_data.host_keys[i] = NULL; 656 0 stevel } 657 0 stevel } 658 0 stevel sensitive_data.ssh1_host_key = NULL; 659 0 stevel (void) memset(sensitive_data.ssh1_cookie, 0, SSH_SESSION_KEY_LENGTH); 660 0 stevel } 661 0 stevel 662 0 stevel /* Demote private to public keys for network child */ 663 0 stevel static void 664 0 stevel demote_sensitive_data(void) 665 0 stevel { 666 0 stevel Key *tmp; 667 0 stevel int i; 668 0 stevel 669 0 stevel if (sensitive_data.server_key) { 670 0 stevel tmp = key_demote(sensitive_data.server_key); 671 0 stevel key_free(sensitive_data.server_key); 672 0 stevel sensitive_data.server_key = tmp; 673 0 stevel } 674 0 stevel 675 0 stevel for (i = 0; i < options.num_host_key_files; i++) { 676 0 stevel if (sensitive_data.host_keys[i]) { 677 0 stevel tmp = key_demote(sensitive_data.host_keys[i]); 678 0 stevel key_free(sensitive_data.host_keys[i]); 679 0 stevel sensitive_data.host_keys[i] = tmp; 680 0 stevel if (tmp->type == KEY_RSA1) 681 0 stevel sensitive_data.ssh1_host_key = tmp; 682 0 stevel } 683 0 stevel } 684 0 stevel 685 0 stevel /* We do not clear ssh1_host key and cookie. XXX - Okay Niels? */ 686 0 stevel } 687 0 stevel 688 0 stevel static char * 689 0 stevel list_hostkey_types(void) 690 0 stevel { 691 0 stevel Buffer b; 692 0 stevel char *p; 693 0 stevel int i; 694 0 stevel 695 0 stevel buffer_init(&b); 696 0 stevel for (i = 0; i < options.num_host_key_files; i++) { 697 0 stevel Key *key = sensitive_data.host_keys[i]; 698 0 stevel if (key == NULL) 699 0 stevel continue; 700 0 stevel switch (key->type) { 701 0 stevel case KEY_RSA: 702 0 stevel case KEY_DSA: 703 0 stevel if (buffer_len(&b) > 0) 704 0 stevel buffer_append(&b, ",", 1); 705 0 stevel p = key_ssh_name(key); 706 0 stevel buffer_append(&b, p, strlen(p)); 707 0 stevel break; 708 0 stevel } 709 0 stevel } 710 0 stevel buffer_append(&b, "\0", 1); 711 0 stevel p = xstrdup(buffer_ptr(&b)); 712 0 stevel buffer_free(&b); 713 0 stevel debug("list_hostkey_types: %s", p); 714 0 stevel return p; 715 0 stevel } 716 0 stevel 717 0 stevel #ifdef lint 718 0 stevel static 719 0 stevel #endif /* lint */ 720 0 stevel Key * 721 0 stevel get_hostkey_by_type(int type) 722 0 stevel { 723 0 stevel int i; 724 0 stevel 725 0 stevel for (i = 0; i < options.num_host_key_files; i++) { 726 0 stevel Key *key = sensitive_data.host_keys[i]; 727 0 stevel if (key != NULL && key->type == type) 728 0 stevel return key; 729 0 stevel } 730 0 stevel return NULL; 731 0 stevel } 732 0 stevel 733 0 stevel #ifdef lint 734 0 stevel static 735 0 stevel #endif /* lint */ 736 0 stevel Key * 737 0 stevel get_hostkey_by_index(int ind) 738 0 stevel { 739 0 stevel if (ind < 0 || ind >= options.num_host_key_files) 740 0 stevel return (NULL); 741 0 stevel return (sensitive_data.host_keys[ind]); 742 0 stevel } 743 0 stevel 744 0 stevel #ifdef lint 745 0 stevel static 746 0 stevel #endif /* lint */ 747 0 stevel int 748 0 stevel get_hostkey_index(Key *key) 749 0 stevel { 750 0 stevel int i; 751 0 stevel 752 0 stevel for (i = 0; i < options.num_host_key_files; i++) { 753 0 stevel if (key == sensitive_data.host_keys[i]) 754 0 stevel return (i); 755 0 stevel } 756 0 stevel return (-1); 757 0 stevel } 758 0 stevel 759 0 stevel /* 760 0 stevel * returns 1 if connection should be dropped, 0 otherwise. 761 0 stevel * dropping starts at connection #max_startups_begin with a probability 762 0 stevel * of (max_startups_rate/100). the probability increases linearly until 763 0 stevel * all connections are dropped for startups > max_startups 764 0 stevel */ 765 0 stevel static int 766 0 stevel drop_connection(int startups) 767 0 stevel { 768 0 stevel double p, r; 769 0 stevel 770 0 stevel if (startups < options.max_startups_begin) 771 0 stevel return 0; 772 0 stevel if (startups >= options.max_startups) 773 0 stevel return 1; 774 0 stevel if (options.max_startups_rate == 100) 775 0 stevel return 1; 776 0 stevel 777 0 stevel p = 100 - options.max_startups_rate; 778 0 stevel p *= startups - options.max_startups_begin; 779 0 stevel p /= (double) (options.max_startups - options.max_startups_begin); 780 0 stevel p += options.max_startups_rate; 781 0 stevel p /= 100.0; 782 0 stevel r = arc4random() / (double) UINT_MAX; 783 0 stevel 784 0 stevel debug("drop_connection: p %g, r %g", p, r); 785 0 stevel return (r < p) ? 1 : 0; 786 0 stevel } 787 0 stevel 788 0 stevel static void 789 0 stevel usage(void) 790 0 stevel { 791 0 stevel (void) fprintf(stderr, gettext("sshd version %s\n"), SSH_VERSION); 792 0 stevel (void) fprintf(stderr, 793 0 stevel gettext("Usage: %s [options]\n" 794 0 stevel "Options:\n" 795 0 stevel " -f file Configuration file (default %s)\n" 796 0 stevel " -d Debugging mode (multiple -d means more " 797 0 stevel "debugging)\n" 798 0 stevel " -i Started from inetd\n" 799 0 stevel " -D Do not fork into daemon mode\n" 800 0 stevel " -t Only test configuration file and keys\n" 801 0 stevel " -q Quiet (no logging)\n" 802 0 stevel " -p port Listen on the specified port (default: 22)\n" 803 0 stevel " -k seconds Regenerate server key every this many seconds " 804 0 stevel "(default: 3600)\n" 805 0 stevel " -g seconds Grace period for authentication (default: 600)\n" 806 0 stevel " -b bits Size of server RSA key (default: 768 bits)\n" 807 0 stevel " -h file File from which to read host key (default: %s)\n" 808 0 stevel " -4 Use IPv4 only\n" 809 0 stevel " -6 Use IPv6 only\n" 810 0 stevel " -o option Process the option as if it was read from " 811 0 stevel "a configuration file.\n"), 812 0 stevel __progname, _PATH_SERVER_CONFIG_FILE, _PATH_HOST_KEY_FILE); 813 0 stevel exit(1); 814 0 stevel } 815 0 stevel 816 0 stevel /* 817 0 stevel * Main program for the daemon. 818 0 stevel */ 819 0 stevel int 820 0 stevel main(int ac, char **av) 821 0 stevel { 822 0 stevel extern char *optarg; 823 0 stevel extern int optind; 824 7574 Jan int opt, j, i, fdsetsz, sock_in = 0, sock_out = 0, newsock = -1, on = 1; 825 0 stevel pid_t pid; 826 0 stevel socklen_t fromlen; 827 0 stevel fd_set *fdset; 828 0 stevel struct sockaddr_storage from; 829 0 stevel const char *remote_ip; 830 0 stevel int remote_port; 831 0 stevel FILE *f; 832 0 stevel struct addrinfo *ai; 833 0 stevel char ntop[NI_MAXHOST], strport[NI_MAXSERV]; 834 0 stevel int listen_sock, maxfd; 835 0 stevel int startup_p[2]; 836 0 stevel int startups = 0; 837 7574 Jan Authctxt *authctxt = NULL; 838 0 stevel Key *key; 839 0 stevel int ret, key_used = 0; 840 0 stevel #ifdef HAVE_BSM 841 0 stevel au_id_t auid = AU_NOAUDITID; 842 0 stevel #endif /* HAVE_BSM */ 843 7574 Jan int mpipe; 844 0 stevel 845 0 stevel __progname = get_progname(av[0]); 846 0 stevel 847 0 stevel (void) g11n_setlocale(LC_ALL, ""); 848 0 stevel 849 0 stevel init_rng(); 850 0 stevel 851 0 stevel /* Save argv. */ 852 0 stevel saved_argc = ac; 853 0 stevel saved_argv = av; 854 0 stevel 855 0 stevel /* Initialize configuration options to their default values. */ 856 0 stevel initialize_server_options(&options); 857 0 stevel 858 0 stevel /* Parse command-line arguments. */ 859 0 stevel while ((opt = getopt(ac, av, "f:p:b:k:h:g:V:u:o:dDeiqtQ46")) != -1) { 860 0 stevel switch (opt) { 861 0 stevel case '4': 862 0 stevel IPv4or6 = AF_INET; 863 0 stevel break; 864 0 stevel case '6': 865 0 stevel IPv4or6 = AF_INET6; 866 0 stevel break; 867 0 stevel case 'f': 868 0 stevel config_file_name = optarg; 869 0 stevel break; 870 0 stevel case 'd': 871 0 stevel if (0 == debug_flag) { 872 0 stevel debug_flag = 1; 873 0 stevel options.log_level = SYSLOG_LEVEL_DEBUG1; 874 0 stevel } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { 875 0 stevel options.log_level++; 876 0 stevel } else { 877 0 stevel (void) fprintf(stderr, 878 0 stevel gettext("Debug level too high.\n")); 879 0 stevel exit(1); 880 0 stevel } 881 0 stevel break; 882 0 stevel case 'D': 883 0 stevel no_daemon_flag = 1; 884 0 stevel break; 885 0 stevel case 'e': 886 0 stevel log_stderr = 1; 887 0 stevel break; 888 0 stevel case 'i': 889 0 stevel inetd_flag = 1; 890 0 stevel break; 891 0 stevel case 'Q': 892 0 stevel /* ignored */ 893 0 stevel break; 894 0 stevel case 'q': 895 0 stevel options.log_level = SYSLOG_LEVEL_QUIET; 896 0 stevel break; 897 0 stevel case 'b': 898 0 stevel options.server_key_bits = atoi(optarg); 899 0 stevel break; 900 0 stevel case 'p': 901 0 stevel options.ports_from_cmdline = 1; 902 0 stevel if (options.num_ports >= MAX_PORTS) { 903 0 stevel (void) fprintf(stderr, gettext("too many ports.\n")); 904 0 stevel exit(1); 905 0 stevel } 906 0 stevel options.ports[options.num_ports++] = a2port(optarg); 907 0 stevel if (options.ports[options.num_ports-1] == 0) { 908 0 stevel (void) fprintf(stderr, gettext("Bad port number.\n")); 909 0 stevel exit(1); 910 0 stevel } 911 0 stevel break; 912 0 stevel case 'g': 913 0 stevel if ((options.login_grace_time = convtime(optarg)) == -1) { 914 0 stevel (void) fprintf(stderr, 915 0 stevel gettext("Invalid login grace time.\n")); 916 0 stevel exit(1); 917 0 stevel } 918 0 stevel break; 919 0 stevel case 'k': 920 0 stevel if ((options.key_regeneration_time = convtime(optarg)) == -1) { 921 0 stevel (void) fprintf(stderr, 922 0 stevel gettext("Invalid key regeneration " 923 0 stevel "interval.\n")); 924 0 stevel exit(1); 925 0 stevel } 926 0 stevel break; 927 0 stevel case 'h': 928 0 stevel if (options.num_host_key_files >= MAX_HOSTKEYS) { 929 0 stevel (void) fprintf(stderr, 930 0 stevel gettext("too many host keys.\n")); 931 0 stevel exit(1); 932 0 stevel } 933 0 stevel options.host_key_files[options.num_host_key_files++] = optarg; 934 0 stevel break; 935 0 stevel case 'V': 936 0 stevel client_version_string = optarg; 937 0 stevel /* only makes sense with inetd_flag, i.e. no listen() */ 938 0 stevel inetd_flag = 1; 939 0 stevel break; 940 0 stevel case 't': 941 0 stevel test_flag = 1; 942 0 stevel break; 943 0 stevel case 'o': 944 0 stevel if (process_server_config_line(&options, optarg, 945 11044 Huie-Ying "command-line", 0, NULL, NULL, NULL, NULL) != 0) 946 0 stevel exit(1); 947 0 stevel break; 948 0 stevel case '?': 949 0 stevel default: 950 0 stevel usage(); 951 0 stevel break; 952 0 stevel } 953 0 stevel } 954 7574 Jan 955 7574 Jan /* 956 7574 Jan * There is no need to use the PKCS#11 engine in the master SSH process. 957 7574 Jan */ 958 0 stevel SSLeay_add_all_algorithms(); 959 7574 Jan seed_rng(); 960 0 stevel channel_set_af(IPv4or6); 961 0 stevel 962 0 stevel /* 963 0 stevel * Force logging to stderr until we have loaded the private host 964 0 stevel * key (unless started from inetd) 965 0 stevel */ 966 0 stevel log_init(__progname, 967 0 stevel options.log_level == SYSLOG_LEVEL_NOT_SET ? 968 0 stevel SYSLOG_LEVEL_INFO : options.log_level, 969 0 stevel options.log_facility == SYSLOG_FACILITY_NOT_SET ? 970 0 stevel SYSLOG_FACILITY_AUTH : options.log_facility, 971 0 stevel !inetd_flag); 972 0 stevel 973 0 stevel #ifdef _UNICOS 974 0 stevel /* Cray can define user privs drop all prives now! 975 0 stevel * Not needed on PRIV_SU systems! 976 0 stevel */ 977 0 stevel drop_cray_privs(); 978 0 stevel #endif 979 0 stevel 980 11044 Huie-Ying /* Fetch our configuration */ 981 11044 Huie-Ying buffer_init(&cfg); 982 11044 Huie-Ying load_server_config(config_file_name, &cfg); 983 11044 Huie-Ying parse_server_config(&options, config_file_name, &cfg, NULL, NULL, NULL); 984 0 stevel 985 0 stevel /* Fill in default values for those options not explicitly set. */ 986 0 stevel fill_default_server_options(&options); 987 0 stevel 988 0 stevel utmp_len = options.lookup_client_hostnames ? utmp_len : 0; 989 0 stevel 990 0 stevel /* Check that there are no remaining arguments. */ 991 0 stevel if (optind < ac) { 992 0 stevel (void) fprintf(stderr, gettext("Extra argument %s.\n"), av[optind]); 993 0 stevel exit(1); 994 0 stevel } 995 0 stevel 996 0 stevel debug("sshd version %.100s", SSH_VERSION); 997 0 stevel 998 0 stevel /* load private host keys */ 999 0 stevel if (options.num_host_key_files > 0) 1000 0 stevel sensitive_data.host_keys = 1001 0 stevel xmalloc(options.num_host_key_files * sizeof(Key *)); 1002 0 stevel for (i = 0; i < options.num_host_key_files; i++) 1003 0 stevel sensitive_data.host_keys[i] = NULL; 1004 0 stevel sensitive_data.server_key = NULL; 1005 0 stevel sensitive_data.ssh1_host_key = NULL; 1006 0 stevel sensitive_data.have_ssh1_key = 0; 1007 0 stevel sensitive_data.have_ssh2_key = 0; 1008 0 stevel 1009 0 stevel for (i = 0; i < options.num_host_key_files; i++) { 1010 0 stevel key = key_load_private(options.host_key_files[i], "", NULL); 1011 0 stevel sensitive_data.host_keys[i] = key; 1012 0 stevel if (key == NULL) { 1013 0 stevel error("Could not load host key: %s", 1014 0 stevel options.host_key_files[i]); 1015 0 stevel sensitive_data.host_keys[i] = NULL; 1016 0 stevel continue; 1017 0 stevel } 1018 0 stevel switch (key->type) { 1019 0 stevel case KEY_RSA1: 1020 0 stevel sensitive_data.ssh1_host_key = key; 1021 0 stevel sensitive_data.have_ssh1_key = 1; 1022 0 stevel break; 1023 0 stevel case KEY_RSA: 1024 0 stevel case KEY_DSA: 1025 0 stevel sensitive_data.have_ssh2_key = 1; 1026 0 stevel break; 1027 0 stevel } 1028 0 stevel debug("private host key: #%d type %d %s", i, key->type, 1029 0 stevel key_type(key)); 1030 0 stevel } 1031 0 stevel if ((options.protocol & SSH_PROTO_1) && !sensitive_data.have_ssh1_key) { 1032 0 stevel log("Disabling protocol version 1. Could not load host key"); 1033 0 stevel options.protocol &= ~SSH_PROTO_1; 1034 0 stevel } 1035 0 stevel if ((options.protocol & SSH_PROTO_2) && 1036 0 stevel !sensitive_data.have_ssh2_key) { 1037 0 stevel #ifdef GSSAPI 1038 0 stevel if (options.gss_keyex) 1039 0 stevel ssh_gssapi_server_mechs(&mechs); 1040 0 stevel 1041 0 stevel if (mechs == GSS_C_NULL_OID_SET) { 1042 0 stevel log("Disabling protocol version 2. Could not load host" 1043 0 stevel "key or GSS-API mechanisms"); 1044 0 stevel options.protocol &= ~SSH_PROTO_2; 1045 0 stevel } 1046 0 stevel #else 1047 0 stevel log("Disabling protocol version 2. Could not load host key"); 1048 0 stevel options.protocol &= ~SSH_PROTO_2; 1049 0 stevel #endif /* GSSAPI */ 1050 0 stevel } 1051 0 stevel if (!(options.protocol & (SSH_PROTO_1|SSH_PROTO_2))) { 1052 0 stevel log("sshd: no hostkeys available -- exiting."); 1053 0 stevel exit(1); 1054 0 stevel } 1055 0 stevel 1056 0 stevel /* Check certain values for sanity. */ 1057 0 stevel if (options.protocol & SSH_PROTO_1) { 1058 0 stevel if (options.server_key_bits < 512 || 1059 0 stevel options.server_key_bits > 32768) { 1060 0 stevel (void) fprintf(stderr, gettext("Bad server key size.\n")); 1061 0 stevel exit(1); 1062 0 stevel } 1063 0 stevel /* 1064 0 stevel * Check that server and host key lengths differ sufficiently. This 1065 0 stevel * is necessary to make double encryption work with rsaref. Oh, I 1066 0 stevel * hate software patents. I dont know if this can go? Niels 1067 0 stevel */ 1068 0 stevel if (options.server_key_bits > 1069 0 stevel BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) - 1070 0 stevel SSH_KEY_BITS_RESERVED && options.server_key_bits < 1071 0 stevel BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + 1072 0 stevel SSH_KEY_BITS_RESERVED) { 1073 0 stevel options.server_key_bits = 1074 0 stevel BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + 1075 0 stevel SSH_KEY_BITS_RESERVED; 1076 0 stevel debug("Forcing server key to %d bits to make it differ from host key.", 1077 0 stevel options.server_key_bits); 1078 0 stevel } 1079 0 stevel } 1080 0 stevel 1081 0 stevel /* Configuration looks good, so exit if in test mode. */ 1082 0 stevel if (test_flag) 1083 0 stevel exit(0); 1084 0 stevel 1085 0 stevel /* 1086 0 stevel * Clear out any supplemental groups we may have inherited. This 1087 0 stevel * prevents inadvertent creation of files with bad modes (in the 1088 0 stevel * portable version at least, it's certainly possible for PAM 1089 0 stevel * to create a file, and we can't control the code in every 1090 0 stevel * module which might be used). 1091 0 stevel */ 1092 0 stevel if (setgroups(0, NULL) < 0) 1093 0 stevel debug("setgroups() failed: %.200s", strerror(errno)); 1094 0 stevel 1095 0 stevel /* Initialize the log (it is reinitialized below in case we forked). */ 1096 0 stevel if (debug_flag && !inetd_flag) 1097 0 stevel log_stderr = 1; 1098 0 stevel log_init(__progname, options.log_level, options.log_facility, log_stderr); 1099 0 stevel 1100 8658 Jan /* 1101 8658 Jan * Solaris 9 and systems upgraded from it may have the Ciphers option 1102 8658 Jan * explicitly set to "aes128-cbc,blowfish-cbc,3des-cbc" in the 1103 8658 Jan * sshd_config. Since the default server cipher list completely changed 1104 8658 Jan * since then we rather notify the administator on startup. We do this 1105 8658 Jan * check after log_init() so that the message goes to syslogd and not to 1106 8658 Jan * stderr (unless the server is in the debug mode). Note that since 1107 8658 Jan * Solaris 10 we no longer ship sshd_config with explicit settings for 1108 8658 Jan * Ciphers or MACs. Do not try to augment the cipher list here since 1109 8658 Jan * that might end up in a very confusing situation. 1110 8658 Jan */ 1111 8658 Jan #define OLD_DEFAULT_CIPHERS_LIST "aes128-cbc,blowfish-cbc,3des-cbc" 1112 8658 Jan if (options.ciphers != NULL && 1113 8658 Jan strcmp(options.ciphers, OLD_DEFAULT_CIPHERS_LIST) == 0) { 1114 8658 Jan notice("Old default value \"%s\" for the \"Ciphers\" " 1115 8658 Jan "option found in use. In general it is prudent to let " 1116 8658 Jan "the server choose the defaults unless your environment " 1117 8658 Jan "specifically needs an explicit setting. See " 1118 8658 Jan "sshd_config(4) for more information.", 1119 8658 Jan OLD_DEFAULT_CIPHERS_LIST); 1120 8658 Jan } 1121 8658 Jan 1122 0 stevel #ifdef HAVE_BSM 1123 0 stevel (void) setauid(&auid); 1124 0 stevel #endif /* HAVE_BSM */ 1125 0 stevel 1126 0 stevel /* 1127 0 stevel * If not in debugging mode, and not started from inetd, disconnect 1128 0 stevel * from the controlling terminal, and fork. The original process 1129 0 stevel * exits. 1130 0 stevel */ 1131 0 stevel if (!(debug_flag || inetd_flag || no_daemon_flag)) { 1132 0 stevel #ifdef TIOCNOTTY 1133 0 stevel int fd; 1134 0 stevel #endif /* TIOCNOTTY */ 1135 0 stevel if (daemon(0, 0) < 0) 1136 0 stevel fatal("daemon() failed: %.200s", strerror(errno)); 1137 0 stevel 1138 0 stevel /* Disconnect from the controlling tty. */ 1139 0 stevel #ifdef TIOCNOTTY 1140 0 stevel fd = open(_PATH_TTY, O_RDWR | O_NOCTTY); 1141 0 stevel if (fd >= 0) { 1142 0 stevel (void) ioctl(fd, TIOCNOTTY, NULL); 1143 0 stevel (void) close(fd); 1144 0 stevel } 1145 0 stevel #endif /* TIOCNOTTY */ 1146 0 stevel } 1147 0 stevel /* Reinitialize the log (because of the fork above). */ 1148 0 stevel log_init(__progname, options.log_level, options.log_facility, log_stderr); 1149 0 stevel 1150 0 stevel /* Initialize the random number generator. */ 1151 0 stevel arc4random_stir(); 1152 0 stevel 1153 0 stevel /* Chdir to the root directory so that the current disk can be 1154 0 stevel unmounted if desired. */ 1155 0 stevel (void) chdir("/"); 1156 0 stevel 1157 0 stevel /* ignore SIGPIPE */ 1158 0 stevel (void) signal(SIGPIPE, SIG_IGN); 1159 0 stevel 1160 0 stevel /* Start listening for a socket, unless started from inetd. */ 1161 0 stevel if (inetd_flag) { 1162 0 stevel int s1; 1163 0 stevel s1 = dup(0); /* Make sure descriptors 0, 1, and 2 are in use. */ 1164 0 stevel (void) dup(s1); 1165 0 stevel sock_in = dup(0); 1166 0 stevel sock_out = dup(1); 1167 0 stevel startup_pipe = -1; 1168 7574 Jan /* we need this later for setting audit context */ 1169 6481 paulson newsock = sock_in; 1170 0 stevel /* 1171 0 stevel * We intentionally do not close the descriptors 0, 1, and 2 1172 0 stevel * as our code for setting the descriptors won\'t work if 1173 0 stevel * ttyfd happens to be one of those. 1174 0 stevel */ 1175 0 stevel debug("inetd sockets after dupping: %d, %d", sock_in, sock_out); 1176 0 stevel if (options.protocol & SSH_PROTO_1) 1177 0 stevel generate_ephemeral_server_key(); 1178 0 stevel } else { 1179 0 stevel for (ai = options.listen_addrs; ai; ai = ai->ai_next) { 1180 0 stevel if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) 1181 0 stevel continue; 1182 0 stevel if (num_listen_socks >= MAX_LISTEN_SOCKS) 1183 0 stevel fatal("Too many listen sockets. " 1184 0 stevel "Enlarge MAX_LISTEN_SOCKS"); 1185 0 stevel if (getnameinfo(ai->ai_addr, ai->ai_addrlen, 1186 0 stevel ntop, sizeof(ntop), strport, sizeof(strport), 1187 0 stevel NI_NUMERICHOST|NI_NUMERICSERV) != 0) { 1188 0 stevel error("getnameinfo failed"); 1189 0 stevel continue; 1190 0 stevel } 1191 0 stevel /* Create socket for listening. */ 1192 0 stevel listen_sock = socket(ai->ai_family, SOCK_STREAM, 0); 1193 0 stevel if (listen_sock < 0) { 1194 0 stevel /* kernel may not support ipv6 */ 1195 0 stevel verbose("socket: %.100s", strerror(errno)); 1196 0 stevel continue; 1197 0 stevel } 1198 0 stevel if (fcntl(listen_sock, F_SETFL, O_NONBLOCK) < 0) { 1199 0 stevel error("listen_sock O_NONBLOCK: %s", strerror(errno)); 1200 0 stevel (void) close(listen_sock); 1201 0 stevel continue; 1202 0 stevel } 1203 0 stevel /* 1204 0 stevel * Set socket options. 1205 0 stevel * Allow local port reuse in TIME_WAIT. 1206 0 stevel */ 1207 0 stevel if (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, 1208 0 stevel &on, sizeof(on)) == -1) 1209 0 stevel error("setsockopt SO_REUSEADDR: %s", strerror(errno)); 1210 0 stevel 1211 0 stevel debug("Bind to port %s on %s.", strport, ntop); 1212 0 stevel 1213 0 stevel /* Bind the socket to the desired port. */ 1214 0 stevel if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) < 0) { 1215 0 stevel if (!ai->ai_next) 1216 0 stevel error("Bind to port %s on %s failed: %.200s.", 1217 0 stevel strport, ntop, strerror(errno)); 1218 0 stevel (void) close(listen_sock); 1219 0 stevel continue; 1220 0 stevel } 1221 0 stevel listen_socks[num_listen_socks] = listen_sock; 1222 0 stevel num_listen_socks++; 1223 0 stevel 1224 0 stevel /* Start listening on the port. */ 1225 0 stevel log("Server listening on %s port %s.", ntop, strport); 1226 0 stevel if (listen(listen_sock, 5) < 0) 1227 0 stevel fatal("listen: %.100s", strerror(errno)); 1228 0 stevel 1229 0 stevel } 1230 0 stevel freeaddrinfo(options.listen_addrs); 1231 0 stevel 1232 0 stevel if (!num_listen_socks) 1233 0 stevel fatal("Cannot bind any address."); 1234 0 stevel 1235 0 stevel if (options.protocol & SSH_PROTO_1) 1236 0 stevel generate_ephemeral_server_key(); 1237 0 stevel 1238 0 stevel /* 1239 0 stevel * Arrange to restart on SIGHUP. The handler needs 1240 0 stevel * listen_sock. 1241 0 stevel */ 1242 0 stevel (void) signal(SIGHUP, sighup_handler); 1243 0 stevel 1244 0 stevel (void) signal(SIGTERM, sigterm_handler); 1245 0 stevel (void) signal(SIGQUIT, sigterm_handler); 1246 0 stevel 1247 0 stevel /* Arrange SIGCHLD to be caught. */ 1248 0 stevel (void) signal(SIGCHLD, main_sigchld_handler); 1249 0 stevel 1250 0 stevel /* Write out the pid file after the sigterm handler is setup */ 1251 0 stevel if (!debug_flag) { 1252 0 stevel /* 1253 0 stevel * Record our pid in /var/run/sshd.pid to make it 1254 0 stevel * easier to kill the correct sshd. We don't want to 1255 0 stevel * do this before the bind above because the bind will 1256 0 stevel * fail if there already is a daemon, and this will 1257 0 stevel * overwrite any old pid in the file. 1258 0 stevel */ 1259 0 stevel f = fopen(options.pid_file, "wb"); 1260 0 stevel if (f) { 1261 0 stevel (void) fprintf(f, "%ld\n", (long) getpid()); 1262 0 stevel (void) fclose(f); 1263 0 stevel } 1264 0 stevel } 1265 0 stevel 1266 0 stevel /* setup fd set for listen */ 1267 0 stevel fdset = NULL; 1268 0 stevel maxfd = 0; 1269 0 stevel for (i = 0; i < num_listen_socks; i++) 1270 0 stevel if (listen_socks[i] > maxfd) 1271 0 stevel maxfd = listen_socks[i]; 1272 0 stevel /* pipes connected to unauthenticated childs */ 1273 0 stevel startup_pipes = xmalloc(options.max_startups * sizeof(int)); 1274 0 stevel for (i = 0; i < options.max_startups; i++) 1275 0 stevel startup_pipes[i] = -1; 1276 0 stevel 1277 0 stevel /* 1278 0 stevel * Stay listening for connections until the system crashes or 1279 0 stevel * the daemon is killed with a signal. 1280 0 stevel */ 1281 0 stevel for (;;) { 1282 0 stevel if (received_sighup) 1283 0 stevel sighup_restart(); 1284 0 stevel if (fdset != NULL) 1285 0 stevel xfree(fdset); 1286 0 stevel fdsetsz = howmany(maxfd+1, NFDBITS) * sizeof(fd_mask); 1287 0 stevel fdset = (fd_set *)xmalloc(fdsetsz); 1288 0 stevel (void) memset(fdset, 0, fdsetsz); 1289 0 stevel 1290 0 stevel for (i = 0; i < num_listen_socks; i++) 1291 0 stevel FD_SET(listen_socks[i], fdset); 1292 0 stevel for (i = 0; i < options.max_startups; i++) 1293 0 stevel if (startup_pipes[i] != -1) 1294 0 stevel FD_SET(startup_pipes[i], fdset); 1295 0 stevel 1296 0 stevel /* Wait in select until there is a connection. */ 1297 0 stevel ret = select(maxfd+1, fdset, NULL, NULL, NULL); 1298 0 stevel if (ret < 0 && errno != EINTR) 1299 0 stevel error("select: %.100s", strerror(errno)); 1300 0 stevel if (received_sigterm) { 1301 0 stevel log("Received signal %d; terminating.", 1302 0 stevel (int) received_sigterm); 1303 0 stevel close_listen_socks(); 1304 0 stevel (void) unlink(options.pid_file); 1305 0 stevel exit(255); 1306 0 stevel } 1307 0 stevel if (key_used && key_do_regen) { 1308 0 stevel generate_ephemeral_server_key(); 1309 0 stevel key_used = 0; 1310 0 stevel key_do_regen = 0; 1311 0 stevel } 1312 0 stevel if (ret < 0) 1313 0 stevel continue; 1314 0 stevel 1315 0 stevel for (i = 0; i < options.max_startups; i++) 1316 0 stevel if (startup_pipes[i] != -1 && 1317 0 stevel FD_ISSET(startup_pipes[i], fdset)) { 1318 0 stevel /* 1319 0 stevel * the read end of the pipe is ready 1320 0 stevel * if the child has closed the pipe 1321 0 stevel * after successful authentication 1322 0 stevel * or if the child has died 1323 0 stevel */ 1324 0 stevel (void) close(startup_pipes[i]); 1325 0 stevel startup_pipes[i] = -1; 1326 0 stevel startups--; 1327 0 stevel } 1328 0 stevel for (i = 0; i < num_listen_socks; i++) { 1329 0 stevel if (!FD_ISSET(listen_socks[i], fdset)) 1330 0 stevel continue; 1331 0 stevel fromlen = sizeof(from); 1332 0 stevel newsock = accept(listen_socks[i], (struct sockaddr *)&from, 1333 0 stevel &fromlen); 1334 0 stevel if (newsock < 0) { 1335 0 stevel if (errno != EINTR && errno != EWOULDBLOCK) 1336 0 stevel error("accept: %.100s", strerror(errno)); 1337 0 stevel continue; 1338 0 stevel } 1339 0 stevel if (fcntl(newsock, F_SETFL, 0) < 0) { 1340 0 stevel error("newsock del O_NONBLOCK: %s", strerror(errno)); 1341 0 stevel (void) close(newsock); 1342 0 stevel continue; 1343 0 stevel } 1344 0 stevel if (drop_connection(startups) == 1) { 1345 0 stevel debug("drop connection #%d", startups); 1346 0 stevel (void) close(newsock); 1347 0 stevel continue; 1348 0 stevel } 1349 0 stevel if (pipe(startup_p) == -1) { 1350 0 stevel (void) close(newsock); 1351 0 stevel continue; 1352 0 stevel } 1353 0 stevel 1354 0 stevel for (j = 0; j < options.max_startups; j++) 1355 0 stevel if (startup_pipes[j] == -1) { 1356 0 stevel startup_pipes[j] = startup_p[0]; 1357 0 stevel if (maxfd < startup_p[0]) 1358 0 stevel maxfd = startup_p[0]; 1359 0 stevel startups++; 1360 0 stevel break; 1361 0 stevel } 1362 0 stevel 1363 0 stevel /* 1364 0 stevel * Got connection. Fork a child to handle it, unless 1365 0 stevel * we are in debugging mode. 1366 0 stevel */ 1367 0 stevel if (debug_flag) { 1368 0 stevel /* 1369 0 stevel * In debugging mode. Close the listening 1370 0 stevel * socket, and start processing the 1371 0 stevel * connection without forking. 1372 0 stevel */ 1373 0 stevel debug("Server will not fork when running in debugging mode."); 1374 0 stevel close_listen_socks(); 1375 0 stevel sock_in = newsock; 1376 0 stevel sock_out = newsock; 1377 0 stevel startup_pipe = -1; 1378 0 stevel pid = getpid(); 1379 0 stevel break; 1380 0 stevel } else { 1381 0 stevel /* 1382 0 stevel * Normal production daemon. Fork, and have 1383 0 stevel * the child process the connection. The 1384 0 stevel * parent continues listening. 1385 0 stevel */ 1386 0 stevel #ifdef HAVE_SOLARIS_CONTRACTS 1387 0 stevel /* 1388 0 stevel * Setup Solaris contract template so 1389 0 stevel * the child process is in a different 1390 0 stevel * process contract than the parent; 1391 0 stevel * prevents established connections from 1392 0 stevel * being killed when the sshd master 1393 0 stevel * listener service is stopped. 1394 0 stevel */ 1395 0 stevel contracts_pre_fork(); 1396 0 stevel #endif /* HAVE_SOLARIS_CONTRACTS */ 1397 0 stevel if ((pid = fork()) == 0) { 1398 0 stevel /* 1399 0 stevel * Child. Close the listening and max_startup 1400 0 stevel * sockets. Start using the accepted socket. 1401 0 stevel * Reinitialize logging (since our pid has 1402 0 stevel * changed). We break out of the loop to handle 1403 0 stevel * the connection. 1404 0 stevel */ 1405 0 stevel #ifdef HAVE_SOLARIS_CONTRACTS 1406 0 stevel contracts_post_fork_child(); 1407 0 stevel #endif /* HAVE_SOLARIS_CONTRACTS */ 1408 5562 jp161948 xfree(fdset); 1409 0 stevel startup_pipe = startup_p[1]; 1410 0 stevel close_startup_pipes(); 1411 0 stevel close_listen_socks(); 1412 0 stevel sock_in = newsock; 1413 0 stevel sock_out = newsock; 1414 0 stevel log_init(__progname, options.log_level, options.log_facility, log_stderr); 1415 0 stevel break; 1416 0 stevel } 1417 0 stevel 1418 0 stevel #ifdef HAVE_SOLARIS_CONTRACTS 1419 0 stevel contracts_post_fork_parent((pid > 0)); 1420 0 stevel #endif /* HAVE_SOLARIS_CONTRACTS */ 1421 0 stevel } 1422 0 stevel 1423 0 stevel /* Parent. Stay in the loop. */ 1424 0 stevel if (pid < 0) 1425 0 stevel error("fork: %.100s", strerror(errno)); 1426 0 stevel else 1427 0 stevel debug("Forked child %ld.", (long)pid); 1428 0 stevel 1429 0 stevel (void) close(startup_p[1]); 1430 0 stevel 1431 0 stevel /* Mark that the key has been used (it was "given" to the child). */ 1432 0 stevel if ((options.protocol & SSH_PROTO_1) && 1433 0 stevel key_used == 0) { 1434 0 stevel /* Schedule server key regeneration alarm. */ 1435 0 stevel (void) signal(SIGALRM, key_regeneration_alarm); 1436 0 stevel (void) alarm(options.key_regeneration_time); 1437 0 stevel key_used = 1; 1438 0 stevel } 1439 0 stevel 1440 0 stevel arc4random_stir(); 1441 0 stevel 1442 7574 Jan /* 1443 7574 Jan * Close the accepted socket since the child 1444 7574 Jan * will now take care of the new connection. 1445 7574 Jan */ 1446 0 stevel (void) close(newsock); 1447 0 stevel } 1448 0 stevel /* child process check (or debug mode) */ 1449 0 stevel if (num_listen_socks < 0) 1450 0 stevel break; 1451 0 stevel } 1452 0 stevel } 1453 0 stevel 1454 7574 Jan /* 1455 7574 Jan * This is the child processing a new connection, the SSH master process 1456 7574 Jan * stays in the ( ; ; ) loop above. 1457 7574 Jan */ 1458 0 stevel #ifdef HAVE_BSM 1459 0 stevel audit_sshd_settid(newsock); 1460 0 stevel #endif 1461 0 stevel /* 1462 0 stevel * Create a new session and process group since the 4.4BSD 1463 0 stevel * setlogin() affects the entire process group. We don't 1464 0 stevel * want the child to be able to affect the parent. 1465 0 stevel */ 1466 0 stevel #if 0 1467 0 stevel /* XXX: this breaks Solaris */ 1468 0 stevel if (!debug_flag && !inetd_flag && setsid() < 0) 1469 0 stevel error("setsid: %.100s", strerror(errno)); 1470 0 stevel #endif 1471 0 stevel 1472 0 stevel /* 1473 0 stevel * Disable the key regeneration alarm. We will not regenerate the 1474 0 stevel * key since we are no longer in a position to give it to anyone. We 1475 0 stevel * will not restart on SIGHUP since it no longer makes sense. 1476 0 stevel */ 1477 0 stevel (void) alarm(0); 1478 0 stevel (void) signal(SIGALRM, SIG_DFL); 1479 0 stevel (void) signal(SIGHUP, SIG_DFL); 1480 0 stevel (void) signal(SIGTERM, SIG_DFL); 1481 0 stevel (void) signal(SIGQUIT, SIG_DFL); 1482 0 stevel (void) signal(SIGCHLD, SIG_DFL); 1483 0 stevel (void) signal(SIGINT, SIG_DFL); 1484 0 stevel 1485 0 stevel /* Set keepalives if requested. */ 1486 0 stevel if (options.keepalives && 1487 0 stevel setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on, 1488 0 stevel sizeof(on)) < 0) 1489 0 stevel debug2("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); 1490 0 stevel 1491 0 stevel /* 1492 0 stevel * Register our connection. This turns encryption off because we do 1493 0 stevel * not have a key. 1494 0 stevel */ 1495 0 stevel packet_set_connection(sock_in, sock_out); 1496 0 stevel 1497 0 stevel remote_port = get_remote_port(); 1498 0 stevel remote_ip = get_remote_ipaddr(); 1499 0 stevel 1500 0 stevel #ifdef LIBWRAP 1501 0 stevel /* Check whether logins are denied from this host. */ 1502 0 stevel { 1503 0 stevel struct request_info req; 1504 0 stevel 1505 0 stevel (void) request_init(&req, RQ_DAEMON, __progname, RQ_FILE, sock_in, 0); 1506 0 stevel fromhost(&req); 1507 0 stevel 1508 0 stevel if (!hosts_access(&req)) { 1509 0 stevel debug("Connection refused by tcp wrapper"); 1510 0 stevel refuse(&req); 1511 0 stevel /* NOTREACHED */ 1512 0 stevel fatal("libwrap refuse returns"); 1513 0 stevel } 1514 0 stevel } 1515 0 stevel #endif /* LIBWRAP */ 1516 0 stevel 1517 0 stevel /* Log the connection. */ 1518 0 stevel verbose("Connection from %.500s port %d", remote_ip, remote_port); 1519 0 stevel 1520 0 stevel sshd_exchange_identification(sock_in, sock_out); 1521 0 stevel /* 1522 0 stevel * Check that the connection comes from a privileged port. 1523 0 stevel * Rhosts-Authentication only makes sense from privileged 1524 0 stevel * programs. Of course, if the intruder has root access on his local 1525 0 stevel * machine, he can connect from any port. So do not use these 1526 0 stevel * authentication methods from machines that you do not trust. 1527 0 stevel */ 1528 0 stevel if (options.rhosts_authentication && 1529 0 stevel (remote_port >= IPPORT_RESERVED || 1530 0 stevel remote_port < IPPORT_RESERVED / 2)) { 1531 0 stevel debug("Rhosts Authentication disabled, " 1532 0 stevel "originating port %d not trusted.", remote_port); 1533 0 stevel options.rhosts_authentication = 0; 1534 0 stevel } 1535 0 stevel #if defined(KRB4) && !defined(KRB5) 1536 0 stevel if (!packet_connection_is_ipv4() && 1537 0 stevel options.kerberos_authentication) { 1538 0 stevel debug("Kerberos Authentication disabled, only available for IPv4."); 1539 0 stevel options.kerberos_authentication = 0; 1540 0 stevel } 1541 0 stevel #endif /* KRB4 && !KRB5 */ 1542 0 stevel #ifdef AFS 1543 0 stevel /* If machine has AFS, set process authentication group. */ 1544 0 stevel if (k_hasafs()) { 1545 0 stevel k_setpag(); 1546 0 stevel k_unlog(); 1547 0 stevel } 1548 0 stevel #endif /* AFS */ 1549 0 stevel 1550 0 stevel packet_set_nonblocking(); 1551 0 stevel 1552 7574 Jan /* 1553 7574 Jan * Start the monitor. That way both processes will have their own 1554 7574 Jan * PKCS#11 sessions. See the PKCS#11 standard for more information on 1555 7574 Jan * fork safety and packet.c for information about forking with the 1556 7574 Jan * engine. 1557 10515 Jan * 1558 10515 Jan * Note that the monitor stays in the function while the child is the 1559 10515 Jan * only one that returns. 1560 7574 Jan */ 1561 7574 Jan altprivsep_start_and_do_monitor(options.use_openssl_engine, 1562 7574 Jan inetd_flag, newsock, startup_pipe); 1563 10515 Jan 1564 10515 Jan /* 1565 10515 Jan * We don't want to listen forever unless the other side successfully 1566 10515 Jan * authenticates itself. So we set up an alarm which is cleared after 1567 10515 Jan * successful authentication. A limit of zero indicates no limit. Note 1568 10515 Jan * that we don't set the alarm in debugging mode; it is just annoying to 1569 10515 Jan * have the server exit just when you are about to discover the bug. 1570 10515 Jan */ 1571 10515 Jan (void) signal(SIGALRM, grace_alarm_handler); 1572 10515 Jan if (!debug_flag) 1573 10515 Jan (void) alarm(options.login_grace_time); 1574 7574 Jan 1575 7574 Jan /* 1576 7574 Jan * The child is about to start the first key exchange while the monitor 1577 7574 Jan * stays in altprivsep_start_and_do_monitor() function. 1578 7574 Jan */ 1579 7574 Jan (void) pkcs11_engine_load(options.use_openssl_engine); 1580 7574 Jan 1581 0 stevel /* perform the key exchange */ 1582 0 stevel /* authenticate user and start session */ 1583 0 stevel if (compat20) { 1584 0 stevel do_ssh2_kex(); 1585 0 stevel authctxt = do_authentication2(); 1586 0 stevel } else { 1587 0 stevel do_ssh1_kex(); 1588 0 stevel authctxt = do_authentication(); 1589 0 stevel } 1590 0 stevel 1591 0 stevel /* Authentication complete */ 1592 0 stevel (void) alarm(0); 1593 7574 Jan /* we no longer need an alarm handler */ 1594 7574 Jan (void) signal(SIGALRM, SIG_DFL); 1595 0 stevel 1596 0 stevel if (startup_pipe != -1) { 1597 0 stevel (void) close(startup_pipe); 1598 0 stevel startup_pipe = -1; 1599 0 stevel } 1600 0 stevel 1601 7574 Jan /* ALTPRIVSEP Child */ 1602 0 stevel 1603 7574 Jan /* 1604 7574 Jan * Drop privileges, access to privileged resources. 1605 7574 Jan * 1606 7574 Jan * Destroy private host keys, if any. 1607 7574 Jan * 1608 7574 Jan * No need to release any GSS credentials -- sshd only acquires 1609 7574 Jan * creds to determine what mechs it can negotiate then releases 1610 7574 Jan * them right away and uses GSS_C_NO_CREDENTIAL to accept 1611 7574 Jan * contexts. 1612 7574 Jan */ 1613 7574 Jan debug2("Unprivileged server process dropping privileges"); 1614 9139 Jan permanently_set_uid(authctxt->pw, options.chroot_directory); 1615 7574 Jan destroy_sensitive_data(); 1616 9139 Jan 1617 9139 Jan /* Just another safety check. */ 1618 9139 Jan if (getuid() != authctxt->pw->pw_uid || 1619 9139 Jan geteuid() != authctxt->pw->pw_uid) { 1620 9139 Jan fatal("Failed to set uids to %u.", (u_int)authctxt->pw->pw_uid); 1621 9139 Jan } 1622 9139 Jan 1623 7574 Jan ssh_gssapi_server_mechs(NULL); /* release cached mechs list */ 1624 7574 Jan packet_set_server(); 1625 0 stevel 1626 7574 Jan /* now send the authentication context to the monitor */ 1627 7574 Jan altprivsep_send_auth_context(authctxt); 1628 0 stevel 1629 7574 Jan mpipe = altprivsep_get_pipe_fd(); 1630 7574 Jan if (fcntl(mpipe, F_SETFL, O_NONBLOCK) < 0) 1631 7574 Jan error("fcntl O_NONBLOCK: %.100s", strerror(errno)); 1632 0 stevel 1633 0 stevel #ifdef HAVE_BSM 1634 7574 Jan fatal_remove_cleanup( 1635 7574 Jan (void (*)(void *))audit_failed_login_cleanup, 1636 7574 Jan (void *)authctxt); 1637 0 stevel #endif /* HAVE_BSM */ 1638 0 stevel 1639 7574 Jan if (compat20) { 1640 7574 Jan debug3("setting handler to forward re-key packets to the monitor"); 1641 7574 Jan dispatch_range(SSH2_MSG_KEXINIT, SSH2_MSG_TRANSPORT_MAX, 1642 7574 Jan &altprivsep_rekey); 1643 7574 Jan } 1644 0 stevel 1645 7574 Jan /* Logged-in session. */ 1646 7574 Jan do_authenticated(authctxt); 1647 0 stevel 1648 7574 Jan /* The connection has been terminated. */ 1649 7574 Jan verbose("Closing connection to %.100s", remote_ip); 1650 0 stevel 1651 7574 Jan packet_close(); 1652 0 stevel 1653 0 stevel #ifdef USE_PAM 1654 7574 Jan finish_pam(authctxt); 1655 0 stevel #endif /* USE_PAM */ 1656 0 stevel 1657 7574 Jan return (0); 1658 0 stevel } 1659 0 stevel 1660 0 stevel /* 1661 0 stevel * Decrypt session_key_int using our private server key and private host key 1662 0 stevel * (key with larger modulus first). 1663 0 stevel */ 1664 0 stevel int 1665 0 stevel ssh1_session_key(BIGNUM *session_key_int) 1666 0 stevel { 1667 0 stevel int rsafail = 0; 1668 0 stevel 1669 0 stevel if (BN_cmp(sensitive_data.server_key->rsa->n, sensitive_data.ssh1_host_key->rsa->n) > 0) { 1670 0 stevel /* Server key has bigger modulus. */ 1671 0 stevel if (BN_num_bits(sensitive_data.server_key->rsa->n) < 1672 0 stevel BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + SSH_KEY_BITS_RESERVED) { 1673 0 stevel fatal("do_connection: %s: server_key %d < host_key %d + SSH_KEY_BITS_RESERVED %d", 1674 0 stevel get_remote_ipaddr(), 1675 0 stevel BN_num_bits(sensitive_data.server_key->rsa->n), 1676 0 stevel BN_num_bits(sensitive_data.ssh1_host_key->rsa->n), 1677 0 stevel SSH_KEY_BITS_RESERVED); 1678 0 stevel } 1679 0 stevel if (rsa_private_decrypt(session_key_int, session_key_int, 1680 0 stevel sensitive_data.server_key->rsa) <= 0) 1681 0 stevel rsafail++; 1682 0 stevel if (rsa_private_decrypt(session_key_int, session_key_int, 1683 0 stevel sensitive_data.ssh1_host_key->rsa) <= 0) 1684 0 stevel rsafail++; 1685 0 stevel } else { 1686 0 stevel /* Host key has bigger modulus (or they are equal). */ 1687 0 stevel if (BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) < 1688 0 stevel BN_num_bits(sensitive_data.server_key->rsa->n) + SSH_KEY_BITS_RESERVED) { 1689 0 stevel fatal("do_connection: %s: host_key %d < server_key %d + SSH_KEY_BITS_RESERVED %d", 1690 0 stevel get_remote_ipaddr(), 1691 0 stevel BN_num_bits(sensitive_data.ssh1_host_key->rsa->n), 1692 0 stevel BN_num_bits(sensitive_data.server_key->rsa->n), 1693 0 stevel SSH_KEY_BITS_RESERVED); 1694 0 stevel } 1695 0 stevel if (rsa_private_decrypt(session_key_int, session_key_int, 1696 0 stevel sensitive_data.ssh1_host_key->rsa) < 0) 1697 0 stevel rsafail++; 1698 0 stevel if (rsa_private_decrypt(session_key_int, session_key_int, 1699 0 stevel sensitive_data.server_key->rsa) < 0) 1700 0 stevel rsafail++; 1701 0 stevel } 1702 0 stevel return (rsafail); 1703 0 stevel } 1704 0 stevel /* 1705 0 stevel * SSH1 key exchange 1706 0 stevel */ 1707 0 stevel static void 1708 0 stevel do_ssh1_kex(void) 1709 0 stevel { 1710 0 stevel int i, len; 1711 0 stevel int rsafail = 0; 1712 0 stevel BIGNUM *session_key_int; 1713 0 stevel u_char session_key[SSH_SESSION_KEY_LENGTH]; 1714 0 stevel u_char cookie[8]; 1715 0 stevel u_int cipher_type, auth_mask, protocol_flags; 1716 0 stevel u_int32_t rnd = 0; 1717 0 stevel 1718 0 stevel /* 1719 0 stevel * Generate check bytes that the client must send back in the user 1720 0 stevel * packet in order for it to be accepted; this is used to defy ip 1721 0 stevel * spoofing attacks. Note that this only works against somebody 1722 0 stevel * doing IP spoofing from a remote machine; any machine on the local 1723 0 stevel * network can still see outgoing packets and catch the random 1724 0 stevel * cookie. This only affects rhosts authentication, and this is one 1725 0 stevel * of the reasons why it is inherently insecure. 1726 0 stevel */ 1727 0 stevel for (i = 0; i < 8; i++) { 1728 0 stevel if (i % 4 == 0) 1729 0 stevel rnd = arc4random(); 1730 0 stevel cookie[i] = rnd & 0xff; 1731 0 stevel rnd >>= 8; 1732 0 stevel } 1733 0 stevel 1734 0 stevel /* 1735 0 stevel * Send our public key. We include in the packet 64 bits of random 1736 0 stevel * data that must be matched in the reply in order to prevent IP 1737 0 stevel * spoofing. 1738 0 stevel */ 1739 0 stevel packet_start(SSH_SMSG_PUBLIC_KEY); 1740 0 stevel for (i = 0; i < 8; i++) 1741 0 stevel packet_put_char(cookie[i]); 1742 0 stevel 1743 0 stevel /* Store our public server RSA key. */ 1744 0 stevel packet_put_int(BN_num_bits(sensitive_data.server_key->rsa->n)); 1745 0 stevel packet_put_bignum(sensitive_data.server_key->rsa->e); 1746 0 stevel packet_put_bignum(sensitive_data.server_key->rsa->n); 1747 0 stevel 1748 0 stevel /* Store our public host RSA key. */ 1749 0 stevel packet_put_int(BN_num_bits(sensitive_data.ssh1_host_key->rsa->n)); 1750 0 stevel packet_put_bignum(sensitive_data.ssh1_host_key->rsa->e); 1751 0 stevel packet_put_bignum(sensitive_data.ssh1_host_key->rsa->n); 1752 0 stevel 1753 0 stevel /* Put protocol flags. */ 1754 0 stevel packet_put_int(SSH_PROTOFLAG_HOST_IN_FWD_OPEN); 1755 0 stevel 1756 0 stevel /* Declare which ciphers we support. */ 1757 0 stevel packet_put_int(cipher_mask_ssh1(0)); 1758 0 stevel 1759 0 stevel /* Declare supported authentication types. */ 1760 0 stevel auth_mask = 0; 1761 0 stevel if (options.rhosts_authentication) 1762 0 stevel auth_mask |= 1 << SSH_AUTH_RHOSTS; 1763 0 stevel if (options.rhosts_rsa_authentication) 1764 0 stevel auth_mask |= 1 << SSH_AUTH_RHOSTS_RSA; 1765 0 stevel if (options.rsa_authentication) 1766 0 stevel auth_mask |= 1 << SSH_AUTH_RSA; 1767 0 stevel #if defined(KRB4) || defined(KRB5) 1768 0 stevel if (options.kerberos_authentication) 1769 0 stevel auth_mask |= 1 << SSH_AUTH_KERBEROS; 1770 0 stevel #endif 1771 0 stevel #if defined(AFS) || defined(KRB5) 1772 0 stevel if (options.kerberos_tgt_passing) 1773 0 stevel auth_mask |= 1 << SSH_PASS_KERBEROS_TGT; 1774 0 stevel #endif 1775 0 stevel #ifdef AFS 1776 0 stevel if (options.afs_token_passing) 1777 0 stevel auth_mask |= 1 << SSH_PASS_AFS_TOKEN; 1778 0 stevel #endif 1779 0 stevel if (options.challenge_response_authentication == 1) 1780 0 stevel auth_mask |= 1 << SSH_AUTH_TIS; 1781 0 stevel if (options.password_authentication) 1782 0 stevel auth_mask |= 1 << SSH_AUTH_PASSWORD; 1783 0 stevel packet_put_int(auth_mask); 1784 0 stevel 1785 0 stevel /* Send the packet and wait for it to be sent. */ 1786 0 stevel packet_send(); 1787 0 stevel packet_write_wait(); 1788 0 stevel 1789 0 stevel debug("Sent %d bit server key and %d bit host key.", 1790 0 stevel BN_num_bits(sensitive_data.server_key->rsa->n), 1791 0 stevel BN_num_bits(sensitive_data.ssh1_host_key->rsa->n)); 1792 0 stevel 1793 0 stevel /* Read clients reply (cipher type and session key). */ 1794 0 stevel packet_read_expect(SSH_CMSG_SESSION_KEY); 1795 0 stevel 1796 0 stevel /* Get cipher type and check whether we accept this. */ 1797 0 stevel cipher_type = packet_get_char(); 1798 0 stevel 1799 0 stevel if (!(cipher_mask_ssh1(0) & (1 << cipher_type))) { 1800 0 stevel packet_disconnect("Warning: client selects unsupported cipher."); 1801 0 stevel } 1802 0 stevel 1803 0 stevel /* Get check bytes from the packet. These must match those we 1804 0 stevel sent earlier with the public key packet. */ 1805 0 stevel for (i = 0; i < 8; i++) { 1806 0 stevel if (cookie[i] != packet_get_char()) { 1807 0 stevel packet_disconnect("IP Spoofing check bytes do not match."); 1808 0 stevel } 1809 0 stevel } 1810 0 stevel 1811 0 stevel debug("Encryption type: %.200s", cipher_name(cipher_type)); 1812 0 stevel 1813 0 stevel /* Get the encrypted integer. */ 1814 0 stevel if ((session_key_int = BN_new()) == NULL) 1815 0 stevel fatal("do_ssh1_kex: BN_new failed"); 1816 0 stevel packet_get_bignum(session_key_int); 1817 0 stevel 1818 0 stevel protocol_flags = packet_get_int(); 1819 0 stevel packet_set_protocol_flags(protocol_flags); 1820 0 stevel packet_check_eom(); 1821 0 stevel 1822 0 stevel /* Decrypt session_key_int using host/server keys */ 1823 5562 jp161948 rsafail = ssh1_session_key(session_key_int); 1824 0 stevel 1825 0 stevel /* 1826 0 stevel * Extract session key from the decrypted integer. The key is in the 1827 0 stevel * least significant 256 bits of the integer; the first byte of the 1828 0 stevel * key is in the highest bits. 1829 0 stevel */ 1830 0 stevel if (!rsafail) { 1831 0 stevel (void) BN_mask_bits(session_key_int, sizeof(session_key) * 8); 1832 0 stevel len = BN_num_bytes(session_key_int); 1833 0 stevel if (len < 0 || len > sizeof(session_key)) { 1834 0 stevel error("do_connection: bad session key len from %s: " 1835 0 stevel "session_key_int %d > sizeof(session_key) %lu", 1836 0 stevel get_remote_ipaddr(), len, (u_long)sizeof(session_key)); 1837 0 stevel rsafail++; 1838 0 stevel } else { 1839 0 stevel (void) memset(session_key, 0, sizeof(session_key)); 1840 0 stevel (void) BN_bn2bin(session_key_int, 1841 0 stevel session_key + sizeof(session_key) - len); 1842 0 stevel 1843 0 stevel compute_session_id(session_id, cookie, 1844 0 stevel sensitive_data.ssh1_host_key->rsa->n, 1845 0 stevel sensitive_data.server_key->rsa->n); 1846 0 stevel /* 1847 0 stevel * Xor the first 16 bytes of the session key with the 1848 0 stevel * session id. 1849 0 stevel */ 1850 0 stevel for (i = 0; i < 16; i++) 1851 0 stevel session_key[i] ^= session_id[i]; 1852 0 stevel } 1853 0 stevel } 1854 0 stevel if (rsafail) { 1855 0 stevel int bytes = BN_num_bytes(session_key_int); 1856 0 stevel u_char *buf = xmalloc(bytes); 1857 0 stevel MD5_CTX md; 1858 0 stevel 1859 0 stevel log("do_connection: generating a fake encryption key"); 1860 0 stevel (void) BN_bn2bin(session_key_int, buf); 1861 0 stevel MD5_Init(&md); 1862 0 stevel MD5_Update(&md, buf, bytes); 1863 0 stevel MD5_Update(&md, sensitive_data.ssh1_cookie, SSH_SESSION_KEY_LENGTH); 1864 0 stevel MD5_Final(session_key, &md); 1865 0 stevel MD5_Init(&md); 1866 0 stevel MD5_Update(&md, session_key, 16); 1867 0 stevel MD5_Update(&md, buf, bytes); 1868 0 stevel MD5_Update(&md, sensitive_data.ssh1_cookie, SSH_SESSION_KEY_LENGTH); 1869 0 stevel MD5_Final(session_key + 16, &md); 1870 0 stevel (void) memset(buf, 0, bytes); 1871 0 stevel xfree(buf); 1872 0 stevel for (i = 0; i < 16; i++) 1873 0 stevel session_id[i] = session_key[i] ^ session_key[i + 16]; 1874 0 stevel } 1875 0 stevel /* Destroy the private and public keys. No longer. */ 1876 0 stevel destroy_sensitive_data(); 1877 0 stevel 1878 0 stevel /* Destroy the decrypted integer. It is no longer needed. */ 1879 0 stevel BN_clear_free(session_key_int); 1880 0 stevel 1881 0 stevel /* Set the session key. From this on all communications will be encrypted. */ 1882 0 stevel packet_set_encryption_key(session_key, SSH_SESSION_KEY_LENGTH, cipher_type); 1883 0 stevel 1884 0 stevel /* Destroy our copy of the session key. It is no longer needed. */ 1885 0 stevel (void) memset(session_key, 0, sizeof(session_key)); 1886 0 stevel 1887 0 stevel debug("Received session key; encryption turned on."); 1888 0 stevel 1889 0 stevel /* Send an acknowledgment packet. Note that this packet is sent encrypted. */ 1890 0 stevel packet_start(SSH_SMSG_SUCCESS); 1891 0 stevel packet_send(); 1892 0 stevel packet_write_wait(); 1893 0 stevel } 1894 0 stevel 1895 0 stevel /* 1896 7574 Jan * Prepare for SSH2 key exchange. 1897 0 stevel */ 1898 7574 Jan Kex * 1899 7574 Jan prepare_for_ssh2_kex(void) 1900 0 stevel { 1901 0 stevel Kex *kex; 1902 0 stevel Kex_hook_func kex_hook = NULL; 1903 0 stevel char **locales; 1904 8658 Jan static char **myproposal; 1905 8658 Jan 1906 8658 Jan myproposal = my_srv_proposal; 1907 0 stevel 1908 0 stevel if (options.ciphers != NULL) { 1909 0 stevel myproposal[PROPOSAL_ENC_ALGS_CTOS] = 1910 0 stevel myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; 1911 0 stevel } 1912 0 stevel myproposal[PROPOSAL_ENC_ALGS_CTOS] = 1913 0 stevel compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); 1914 0 stevel myproposal[PROPOSAL_ENC_ALGS_STOC] = 1915 0 stevel compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); 1916 0 stevel 1917 0 stevel if (options.macs != NULL) { 1918 0 stevel myproposal[PROPOSAL_MAC_ALGS_CTOS] = 1919 0 stevel myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; 1920 0 stevel } 1921 0 stevel if (!options.compression) { 1922 0 stevel myproposal[PROPOSAL_COMP_ALGS_CTOS] = 1923 0 stevel myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; 1924 0 stevel } 1925 0 stevel 1926 0 stevel /* 1927 0 stevel * Prepare kex algs / hostkey algs (excluding GSS, which is 1928 0 stevel * handled in the kex hook. 1929 0 stevel * 1930 0 stevel * XXX This should probably move to the kex hook as well, where 1931 0 stevel * all non-constant kex offer material belongs. 1932 0 stevel */ 1933 0 stevel myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = list_hostkey_types(); 1934 0 stevel 1935 0 stevel /* If we have no host key algs we can't offer KEXDH/KEX_DH_GEX */ 1936 0 stevel if (myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] == NULL || 1937 0 stevel *myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] == '\0') 1938 0 stevel myproposal[PROPOSAL_KEX_ALGS] = ""; 1939 0 stevel 1940 0 stevel if ((locales = g11n_getlocales()) != NULL) { 1941 0 stevel /* Solaris 9 SSH expects a list of locales */ 1942 0 stevel if (datafellows & SSH_BUG_LOCALES_NOT_LANGTAGS) 1943 0 stevel myproposal[PROPOSAL_LANG_STOC] = xjoin(locales, ','); 1944 0 stevel else 1945 0 stevel myproposal[PROPOSAL_LANG_STOC] = 1946 0 stevel g11n_locales2langs(locales); 1947 0 stevel } 1948 0 stevel 1949 5562 jp161948 if (locales != NULL) 1950 5562 jp161948 g11n_freelist(locales); 1951 5562 jp161948 1952 9845 Jan if ((myproposal[PROPOSAL_LANG_STOC] != NULL) && 1953 0 stevel (strcmp(myproposal[PROPOSAL_LANG_STOC], "")) != 0) 1954 0 stevel myproposal[PROPOSAL_LANG_CTOS] = 1955 0 stevel xstrdup(myproposal[PROPOSAL_LANG_STOC]); 1956 0 stevel 1957 0 stevel #ifdef GSSAPI 1958 0 stevel if (options.gss_keyex) 1959 0 stevel kex_hook = ssh_gssapi_server_kex_hook; 1960 0 stevel #endif /* GSSAPI */ 1961 0 stevel 1962 0 stevel kex = kex_setup(NULL, myproposal, kex_hook); 1963 5562 jp161948 1964 9845 Jan /* 1965 9845 Jan * Note that the my_srv_proposal variable (ie., myproposal) is staticly 1966 9845 Jan * initialized with "" for the language fields; we must not xfree such 1967 9845 Jan * strings. 1968 9845 Jan */ 1969 9845 Jan if (myproposal[PROPOSAL_LANG_STOC] != NULL && 1970 9845 Jan strcmp(myproposal[PROPOSAL_LANG_STOC], "") != 0) 1971 5562 jp161948 xfree(myproposal[PROPOSAL_LANG_STOC]); 1972 9845 Jan if (myproposal[PROPOSAL_LANG_CTOS] != NULL && 1973 9845 Jan strcmp(myproposal[PROPOSAL_LANG_STOC], "") != 0) 1974 5562 jp161948 xfree(myproposal[PROPOSAL_LANG_CTOS]); 1975 5562 jp161948 1976 0 stevel kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; 1977 0 stevel kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; 1978 0 stevel #ifdef GSSAPI 1979 0 stevel kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server; 1980 0 stevel #endif /* GSSAPI */ 1981 0 stevel kex->server = 1; 1982 7574 Jan kex->client_version_string = client_version_string; 1983 7574 Jan kex->server_version_string = server_version_string; 1984 7574 Jan kex->load_host_key = &get_hostkey_by_type; 1985 7574 Jan kex->host_key_index = &get_hostkey_index; 1986 0 stevel 1987 0 stevel xxx_kex = kex; 1988 7574 Jan return (kex); 1989 7574 Jan } 1990 7574 Jan 1991 7574 Jan /* 1992 7574 Jan * Do SSH2 key exchange. 1993 7574 Jan */ 1994 7574 Jan static void 1995 7574 Jan do_ssh2_kex(void) 1996 7574 Jan { 1997 7574 Jan Kex *kex; 1998 7574 Jan 1999 7574 Jan kex = prepare_for_ssh2_kex(); 2000 7574 Jan kex_start(kex); 2001 0 stevel 2002 0 stevel dispatch_run(DISPATCH_BLOCK, &kex->done, kex); 2003 0 stevel 2004 0 stevel if (kex->name) { 2005 0 stevel xfree(kex->name); 2006 0 stevel kex->name = NULL; 2007 0 stevel } 2008 0 stevel session_id2 = kex->session_id; 2009 0 stevel session_id2_len = kex->session_id_len; 2010 0 stevel 2011 0 stevel #ifdef DEBUG_KEXDH 2012 0 stevel /* send 1st encrypted/maced/compressed message */ 2013 0 stevel packet_start(SSH2_MSG_IGNORE); 2014 0 stevel packet_put_cstring("markus"); 2015 0 stevel packet_send(); 2016 0 stevel packet_write_wait(); 2017 0 stevel #endif 2018 0 stevel debug("KEX done"); 2019 0 stevel } 2020
Indexes created Fri Nov 27 04:12:29 UTC 2009
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