Annotation of src/usr.bin/ssh/sshd.c, Revision 1.545
1.545 ! djm 1: /* $OpenBSD: sshd.c,v 1.544 2020/01/23 07:10:22 dtucker Exp $ */
1.86 markus 2: /*
1.65 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.126 deraadt 6: * This program is the ssh daemon. It listens for connections from clients,
7: * and performs authentication, executes use commands or shell, and forwards
1.65 deraadt 8: * information to/from the application to the user client over an encrypted
1.126 deraadt 9: * connection. This can also handle forwarding of X11, TCP/IP, and
10: * authentication agent connections.
1.98 markus 11: *
1.126 deraadt 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:
1.231 provos 19: * Privilege Separation:
1.126 deraadt 20: *
1.231 provos 21: * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved.
22: * Copyright (c) 2002 Niels Provos. All rights reserved.
1.126 deraadt 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.
1.65 deraadt 43: */
1.1 deraadt 44:
1.343 deraadt 45: #include <sys/types.h>
1.320 stevesk 46: #include <sys/ioctl.h>
1.321 stevesk 47: #include <sys/wait.h>
1.343 deraadt 48: #include <sys/tree.h>
1.323 stevesk 49: #include <sys/stat.h>
1.334 stevesk 50: #include <sys/socket.h>
1.340 stevesk 51: #include <sys/time.h>
1.357 djm 52: #include <sys/queue.h>
1.319 stevesk 53:
1.336 stevesk 54: #include <errno.h>
1.335 stevesk 55: #include <fcntl.h>
1.338 stevesk 56: #include <netdb.h>
1.319 stevesk 57: #include <paths.h>
1.333 stevesk 58: #include <pwd.h>
1.322 stevesk 59: #include <signal.h>
1.342 stevesk 60: #include <stdio.h>
1.341 stevesk 61: #include <stdlib.h>
1.339 stevesk 62: #include <string.h>
1.541 naddy 63: #include <stdarg.h>
1.344 dtucker 64: #include <unistd.h>
1.438 deraadt 65: #include <limits.h>
1.1 deraadt 66:
1.426 markus 67: #ifdef WITH_OPENSSL
1.155 markus 68: #include <openssl/bn.h>
1.426 markus 69: #endif
1.155 markus 70:
1.343 deraadt 71: #include "xmalloc.h"
1.155 markus 72: #include "ssh.h"
73: #include "ssh2.h"
1.171 djm 74: #include "sshpty.h"
1.1 deraadt 75: #include "packet.h"
1.155 markus 76: #include "log.h"
1.511 markus 77: #include "sshbuf.h"
1.428 millert 78: #include "misc.h"
1.454 markus 79: #include "match.h"
1.1 deraadt 80: #include "servconf.h"
81: #include "uidswap.h"
1.33 markus 82: #include "compat.h"
1.155 markus 83: #include "cipher.h"
1.415 markus 84: #include "digest.h"
1.512 markus 85: #include "sshkey.h"
1.98 markus 86: #include "kex.h"
87: #include "myproposal.h"
1.108 markus 88: #include "authfile.h"
1.154 markus 89: #include "pathnames.h"
1.155 markus 90: #include "atomicio.h"
91: #include "canohost.h"
1.343 deraadt 92: #include "hostfile.h"
1.155 markus 93: #include "auth.h"
1.404 markus 94: #include "authfd.h"
1.294 djm 95: #include "msg.h"
1.186 markus 96: #include "dispatch.h"
1.206 stevesk 97: #include "channels.h"
1.230 provos 98: #include "session.h"
1.231 provos 99: #include "monitor.h"
1.343 deraadt 100: #ifdef GSSAPI
101: #include "ssh-gss.h"
102: #endif
1.231 provos 103: #include "monitor_wrap.h"
1.385 djm 104: #include "ssh-sandbox.h"
1.506 djm 105: #include "auth-options.h"
1.332 stevesk 106: #include "version.h"
1.432 djm 107: #include "ssherr.h"
1.542 djm 108: #include "sk-api.h"
1.522 djm 109:
1.296 djm 110: /* Re-exec fds */
111: #define REEXEC_DEVCRYPTO_RESERVED_FD (STDERR_FILENO + 1)
112: #define REEXEC_STARTUP_PIPE_FD (STDERR_FILENO + 2)
113: #define REEXEC_CONFIG_PASS_FD (STDERR_FILENO + 3)
114: #define REEXEC_MIN_FREE_FD (STDERR_FILENO + 4)
115:
1.138 markus 116: extern char *__progname;
117:
1.1 deraadt 118: /* Server configuration options. */
119: ServerOptions options;
120:
121: /* Name of the server configuration file. */
1.154 markus 122: char *config_file_name = _PATH_SERVER_CONFIG_FILE;
1.1 deraadt 123:
1.105 markus 124: /*
1.65 deraadt 125: * Debug mode flag. This can be set on the command line. If debug
126: * mode is enabled, extra debugging output will be sent to the system
127: * log, the daemon will not go to background, and will exit after processing
128: * the first connection.
129: */
1.1 deraadt 130: int debug_flag = 0;
131:
1.499 djm 132: /*
133: * Indicating that the daemon should only test the configuration and keys.
134: * If test_flag > 1 ("-T" flag), then sshd will also dump the effective
135: * configuration, optionally using connection information provided by the
136: * "-C" flag.
137: */
1.521 djm 138: static int test_flag = 0;
1.203 stevesk 139:
1.1 deraadt 140: /* Flag indicating that the daemon is being started from inetd. */
1.521 djm 141: static int inetd_flag = 0;
1.1 deraadt 142:
1.135 markus 143: /* Flag indicating that sshd should not detach and become a daemon. */
1.521 djm 144: static int no_daemon_flag = 0;
1.135 markus 145:
1.47 markus 146: /* debug goes to stderr unless inetd_flag is set */
1.521 djm 147: static int log_stderr = 0;
1.47 markus 148:
1.1 deraadt 149: /* Saved arguments to main(). */
1.521 djm 150: static char **saved_argv;
1.1 deraadt 151:
1.294 djm 152: /* re-exec */
1.521 djm 153: static int rexeced_flag = 0;
154: static int rexec_flag = 1;
155: static int rexec_argc = 0;
156: static char **rexec_argv;
1.294 djm 157:
1.66 markus 158: /*
1.75 markus 159: * The sockets that the server is listening; this is used in the SIGHUP
160: * signal handler.
1.66 markus 161: */
1.75 markus 162: #define MAX_LISTEN_SOCKS 16
1.521 djm 163: static int listen_socks[MAX_LISTEN_SOCKS];
164: static int num_listen_socks = 0;
1.1 deraadt 165:
1.404 markus 166: /* Daemon's agent connection */
1.432 djm 167: int auth_sock = -1;
1.521 djm 168: static int have_agent = 0;
1.404 markus 169:
1.66 markus 170: /*
171: * Any really sensitive data in the application is contained in this
172: * structure. The idea is that this structure could be locked into memory so
173: * that the pages do not get written into swap. However, there are some
174: * problems. The private key contains BIGNUMs, and we do not (in principle)
175: * have access to the internals of them, and locking just the structure is
176: * not very useful. Currently, memory locking is not implemented.
177: */
1.64 markus 178: struct {
1.488 markus 179: struct sshkey **host_keys; /* all private host keys */
180: struct sshkey **host_pubkeys; /* all public host keys */
181: struct sshkey **host_certificates; /* all public host certificates */
182: int have_ssh2_key;
1.1 deraadt 183: } sensitive_data;
184:
1.199 markus 185: /* This is set to true when a signal is received. */
1.212 markus 186: static volatile sig_atomic_t received_sighup = 0;
187: static volatile sig_atomic_t received_sigterm = 0;
1.1 deraadt 188:
1.96 markus 189: /* session identifier, used by RSA-auth */
1.140 markus 190: u_char session_id[16];
1.96 markus 191:
1.108 markus 192: /* same for ssh2 */
1.140 markus 193: u_char *session_id2 = NULL;
1.269 markus 194: u_int session_id2_len = 0;
1.108 markus 195:
1.125 markus 196: /* record remote hostname or ip */
1.438 deraadt 197: u_int utmp_len = HOST_NAME_MAX+1;
1.125 markus 198:
1.533 djm 199: /*
200: * startup_pipes/flags are used for tracking children of the listening sshd
201: * process early in their lifespans. This tracking is needed for three things:
202: *
203: * 1) Implementing the MaxStartups limit of concurrent unauthenticated
204: * connections.
205: * 2) Avoiding a race condition for SIGHUP processing, where child processes
206: * may have listen_socks open that could collide with main listener process
207: * after it restarts.
208: * 3) Ensuring that rexec'd sshd processes have received their initial state
209: * from the parent listen process before handling SIGHUP.
210: *
211: * Child processes signal that they have completed closure of the listen_socks
212: * and (if applicable) received their rexec state by sending a char over their
213: * sock. Child processes signal that authentication has completed by closing
214: * the sock (or by exiting).
215: */
1.521 djm 216: static int *startup_pipes = NULL;
1.533 djm 217: static int *startup_flags = NULL; /* Indicates child closed listener */
218: static int startup_pipe = -1; /* in child */
1.211 markus 219:
1.231 provos 220: /* variables used for privilege separation */
1.337 dtucker 221: int use_privsep = -1;
1.285 dtucker 222: struct monitor *pmonitor = NULL;
1.386 djm 223: int privsep_is_preauth = 1;
1.231 provos 224:
1.527 djm 225: /* global connection state and authentication contexts */
1.278 markus 226: Authctxt *the_authctxt = NULL;
1.527 djm 227: struct ssh *the_active_state;
1.278 markus 228:
1.506 djm 229: /* global key/cert auth options. XXX move to permanent ssh->authctxt? */
230: struct sshauthopt *auth_opts = NULL;
231:
1.337 dtucker 232: /* sshd_config buffer */
1.511 markus 233: struct sshbuf *cfg;
1.337 dtucker 234:
1.299 dtucker 235: /* message to be displayed after login */
1.510 markus 236: struct sshbuf *loginmsg;
1.299 dtucker 237:
1.1 deraadt 238: /* Prototypes for various functions defined later in this file. */
1.200 itojun 239: void destroy_sensitive_data(void);
1.231 provos 240: void demote_sensitive_data(void);
1.525 djm 241: static void do_ssh2_kex(struct ssh *);
1.129 provos 242:
1.545 ! djm 243: static char *listener_proctitle;
! 244:
1.87 markus 245: /*
1.75 markus 246: * Close all listening sockets
247: */
1.200 itojun 248: static void
1.75 markus 249: close_listen_socks(void)
250: {
251: int i;
1.250 deraadt 252:
1.75 markus 253: for (i = 0; i < num_listen_socks; i++)
254: close(listen_socks[i]);
255: num_listen_socks = -1;
256: }
257:
1.211 markus 258: static void
259: close_startup_pipes(void)
260: {
261: int i;
1.250 deraadt 262:
1.211 markus 263: if (startup_pipes)
264: for (i = 0; i < options.max_startups; i++)
265: if (startup_pipes[i] != -1)
266: close(startup_pipes[i]);
267: }
268:
1.75 markus 269: /*
1.65 deraadt 270: * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP;
271: * the effect is to reread the configuration file (and to regenerate
272: * the server key).
273: */
1.327 deraadt 274:
275: /*ARGSUSED*/
1.200 itojun 276: static void
1.64 markus 277: sighup_handler(int sig)
1.1 deraadt 278: {
1.64 markus 279: received_sighup = 1;
1.1 deraadt 280: }
281:
1.65 deraadt 282: /*
283: * Called from the main program after receiving SIGHUP.
284: * Restarts the server.
285: */
1.200 itojun 286: static void
1.165 itojun 287: sighup_restart(void)
1.1 deraadt 288: {
1.264 itojun 289: logit("Received SIGHUP; restarting.");
1.479 dtucker 290: if (options.pid_file != NULL)
291: unlink(options.pid_file);
1.75 markus 292: close_listen_socks();
1.211 markus 293: close_startup_pipes();
1.349 dtucker 294: alarm(0); /* alarm timer persists across exec */
1.544 dtucker 295: ssh_signal(SIGHUP, SIG_IGN); /* will be restored after exec */
1.64 markus 296: execv(saved_argv[0], saved_argv);
1.264 itojun 297: logit("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0],
1.250 deraadt 298: strerror(errno));
1.64 markus 299: exit(1);
1.1 deraadt 300: }
301:
1.65 deraadt 302: /*
303: * Generic signal handler for terminating signals in the master daemon.
304: */
1.327 deraadt 305: /*ARGSUSED*/
1.200 itojun 306: static void
1.64 markus 307: sigterm_handler(int sig)
1.1 deraadt 308: {
1.199 markus 309: received_sigterm = sig;
1.1 deraadt 310: }
311:
1.65 deraadt 312: /*
313: * SIGCHLD handler. This is called whenever a child dies. This will then
1.199 markus 314: * reap any zombies left by exited children.
1.65 deraadt 315: */
1.327 deraadt 316: /*ARGSUSED*/
1.200 itojun 317: static void
1.64 markus 318: main_sigchld_handler(int sig)
1.1 deraadt 319: {
1.250 deraadt 320: int save_errno = errno;
1.239 markus 321: pid_t pid;
1.64 markus 322: int status;
1.60 deraadt 323:
1.544 dtucker 324: debug("main_sigchld_handler: %s", strsignal(sig));
325:
1.239 markus 326: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.537 deraadt 327: (pid == -1 && errno == EINTR))
1.64 markus 328: ;
329: errno = save_errno;
1.1 deraadt 330: }
331:
1.65 deraadt 332: /*
333: * Signal handler for the alarm after the login grace period has expired.
334: */
1.327 deraadt 335: /*ARGSUSED*/
1.200 itojun 336: static void
1.64 markus 337: grace_alarm_handler(int sig)
1.1 deraadt 338: {
1.285 dtucker 339: if (use_privsep && pmonitor != NULL && pmonitor->m_pid > 0)
340: kill(pmonitor->m_pid, SIGALRM);
1.394 djm 341:
342: /*
343: * Try to kill any processes that we have spawned, E.g. authorized
344: * keys command helpers.
345: */
346: if (getpgid(0) == getpid()) {
1.544 dtucker 347: ssh_signal(SIGTERM, SIG_IGN);
1.416 djm 348: kill(0, SIGTERM);
1.394 djm 349: }
1.285 dtucker 350:
1.527 djm 351: /* XXX pre-format ipaddr/port so we don't need to access active_state */
1.64 markus 352: /* Log error and exit. */
1.466 djm 353: sigdie("Timeout before authentication for %s port %d",
1.527 djm 354: ssh_remote_ipaddr(the_active_state),
355: ssh_remote_port(the_active_state));
1.62 markus 356: }
357:
1.134 markus 358: /* Destroy the host and server keys. They will no longer be needed. */
1.108 markus 359: void
360: destroy_sensitive_data(void)
361: {
1.493 djm 362: u_int i;
1.134 markus 363:
1.217 deraadt 364: for (i = 0; i < options.num_host_key_files; i++) {
1.134 markus 365: if (sensitive_data.host_keys[i]) {
1.512 markus 366: sshkey_free(sensitive_data.host_keys[i]);
1.134 markus 367: sensitive_data.host_keys[i] = NULL;
368: }
1.373 djm 369: if (sensitive_data.host_certificates[i]) {
1.512 markus 370: sshkey_free(sensitive_data.host_certificates[i]);
1.373 djm 371: sensitive_data.host_certificates[i] = NULL;
372: }
1.134 markus 373: }
374: }
375:
1.231 provos 376: /* Demote private to public keys for network child */
377: void
378: demote_sensitive_data(void)
379: {
1.488 markus 380: struct sshkey *tmp;
1.493 djm 381: u_int i;
1.512 markus 382: int r;
1.231 provos 383:
384: for (i = 0; i < options.num_host_key_files; i++) {
385: if (sensitive_data.host_keys[i]) {
1.515 djm 386: if ((r = sshkey_from_private(
387: sensitive_data.host_keys[i], &tmp)) != 0)
1.512 markus 388: fatal("could not demote host %s key: %s",
389: sshkey_type(sensitive_data.host_keys[i]),
390: ssh_err(r));
391: sshkey_free(sensitive_data.host_keys[i]);
1.231 provos 392: sensitive_data.host_keys[i] = tmp;
393: }
1.373 djm 394: /* Certs do not need demotion */
1.231 provos 395: }
396: }
397:
1.233 markus 398: static void
1.231 provos 399: privsep_preauth_child(void)
400: {
1.253 deraadt 401: gid_t gidset[1];
1.250 deraadt 402: struct passwd *pw;
1.231 provos 403:
404: /* Enable challenge-response authentication for privilege separation */
405: privsep_challenge_enable();
1.419 djm 406:
1.420 markus 407: #ifdef GSSAPI
1.419 djm 408: /* Cache supported mechanism OIDs for later use */
1.516 djm 409: ssh_gssapi_prepare_supported_oids();
1.420 markus 410: #endif
1.231 provos 411:
412: /* Demote the private keys to public keys. */
413: demote_sensitive_data();
414:
1.460 djm 415: /* Demote the child */
416: if (getuid() == 0 || geteuid() == 0) {
417: if ((pw = getpwnam(SSH_PRIVSEP_USER)) == NULL)
418: fatal("Privilege separation user %s does not exist",
419: SSH_PRIVSEP_USER);
1.500 djm 420: pw = pwcopy(pw); /* Ensure mutable */
1.460 djm 421: endpwent();
1.500 djm 422: freezero(pw->pw_passwd, strlen(pw->pw_passwd));
1.460 djm 423:
424: /* Change our root directory */
425: if (chroot(_PATH_PRIVSEP_CHROOT_DIR) == -1)
426: fatal("chroot(\"%s\"): %s", _PATH_PRIVSEP_CHROOT_DIR,
427: strerror(errno));
428: if (chdir("/") == -1)
429: fatal("chdir(\"/\"): %s", strerror(errno));
430:
431: /*
432: * Drop our privileges
433: * NB. Can't use setusercontext() after chroot.
434: */
435: debug3("privsep user:group %u:%u", (u_int)pw->pw_uid,
436: (u_int)pw->pw_gid);
437: gidset[0] = pw->pw_gid;
1.537 deraadt 438: if (setgroups(1, gidset) == -1)
1.460 djm 439: fatal("setgroups: %.100s", strerror(errno));
440: permanently_set_uid(pw);
441: }
1.231 provos 442: }
443:
1.278 markus 444: static int
1.525 djm 445: privsep_preauth(struct ssh *ssh)
1.237 markus 446: {
1.432 djm 447: int status, r;
1.237 markus 448: pid_t pid;
1.384 djm 449: struct ssh_sandbox *box = NULL;
1.237 markus 450:
451: /* Set up unprivileged child process to deal with network data */
1.242 mouring 452: pmonitor = monitor_init();
1.237 markus 453: /* Store a pointer to the kex for later rekeying */
1.525 djm 454: pmonitor->m_pkex = &ssh->kex;
1.237 markus 455:
1.393 djm 456: if (use_privsep == PRIVSEP_ON)
1.384 djm 457: box = ssh_sandbox_init();
1.237 markus 458: pid = fork();
459: if (pid == -1) {
460: fatal("fork of unprivileged child failed");
461: } else if (pid != 0) {
1.245 mpech 462: debug2("Network child is on pid %ld", (long)pid);
1.237 markus 463:
1.392 markus 464: pmonitor->m_pid = pid;
1.432 djm 465: if (have_agent) {
466: r = ssh_get_authentication_socket(&auth_sock);
467: if (r != 0) {
468: error("Could not get agent socket: %s",
469: ssh_err(r));
470: have_agent = 0;
471: }
472: }
1.384 djm 473: if (box != NULL)
474: ssh_sandbox_parent_preauth(box, pid);
1.526 djm 475: monitor_child_preauth(ssh, pmonitor);
1.237 markus 476:
477: /* Wait for the child's exit status */
1.537 deraadt 478: while (waitpid(pid, &status, 0) == -1) {
1.386 djm 479: if (errno == EINTR)
480: continue;
481: pmonitor->m_pid = -1;
482: fatal("%s: waitpid: %s", __func__, strerror(errno));
1.384 djm 483: }
1.386 djm 484: privsep_is_preauth = 0;
485: pmonitor->m_pid = -1;
1.384 djm 486: if (WIFEXITED(status)) {
487: if (WEXITSTATUS(status) != 0)
488: fatal("%s: preauth child exited with status %d",
489: __func__, WEXITSTATUS(status));
490: } else if (WIFSIGNALED(status))
491: fatal("%s: preauth child terminated by signal %d",
492: __func__, WTERMSIG(status));
493: if (box != NULL)
494: ssh_sandbox_parent_finish(box);
495: return 1;
1.237 markus 496: } else {
497: /* child */
1.383 djm 498: close(pmonitor->m_sendfd);
499: close(pmonitor->m_log_recvfd);
1.237 markus 500:
1.383 djm 501: /* Arrange for logging to be sent to the monitor */
502: set_log_handler(mm_log_handler, pmonitor);
1.237 markus 503:
1.460 djm 504: privsep_preauth_child();
1.238 stevesk 505: setproctitle("%s", "[net]");
1.384 djm 506: if (box != NULL)
507: ssh_sandbox_child(box);
508:
509: return 0;
1.237 markus 510: }
511: }
512:
1.233 markus 513: static void
1.525 djm 514: privsep_postauth(struct ssh *ssh, Authctxt *authctxt)
1.231 provos 515: {
1.474 djm 516: if (authctxt->pw->pw_uid == 0) {
1.231 provos 517: /* File descriptor passing is broken or root login */
518: use_privsep = 0;
1.315 djm 519: goto skip;
1.231 provos 520: }
1.234 markus 521:
1.231 provos 522: /* New socket pair */
1.242 mouring 523: monitor_reinit(pmonitor);
1.231 provos 524:
1.242 mouring 525: pmonitor->m_pid = fork();
526: if (pmonitor->m_pid == -1)
1.231 provos 527: fatal("fork of unprivileged child failed");
1.242 mouring 528: else if (pmonitor->m_pid != 0) {
1.364 markus 529: verbose("User child is on pid %ld", (long)pmonitor->m_pid);
1.510 markus 530: sshbuf_reset(loginmsg);
1.526 djm 531: monitor_clear_keystate(ssh, pmonitor);
532: monitor_child_postauth(ssh, pmonitor);
1.231 provos 533:
534: /* NEVERREACHED */
535: exit(0);
536: }
537:
1.383 djm 538: /* child */
539:
1.242 mouring 540: close(pmonitor->m_sendfd);
1.383 djm 541: pmonitor->m_sendfd = -1;
1.231 provos 542:
543: /* Demote the private keys to public keys. */
544: demote_sensitive_data();
1.354 djm 545:
1.231 provos 546: /* Drop privileges */
547: do_setusercontext(authctxt->pw);
548:
1.315 djm 549: skip:
1.231 provos 550: /* It is safe now to apply the key state */
1.526 djm 551: monitor_apply_keystate(ssh, pmonitor);
1.312 markus 552:
553: /*
554: * Tell the packet layer that authentication was successful, since
555: * this information is not part of the key state.
556: */
1.525 djm 557: ssh_packet_set_authenticated(ssh);
1.231 provos 558: }
559:
1.509 djm 560: static void
561: append_hostkey_type(struct sshbuf *b, const char *s)
562: {
563: int r;
564:
565: if (match_pattern_list(s, options.hostkeyalgorithms, 0) != 1) {
566: debug3("%s: %s key not permitted by HostkeyAlgorithms",
567: __func__, s);
568: return;
569: }
570: if ((r = sshbuf_putf(b, "%s%s", sshbuf_len(b) > 0 ? "," : "", s)) != 0)
571: fatal("%s: sshbuf_putf: %s", __func__, ssh_err(r));
572: }
573:
1.200 itojun 574: static char *
1.134 markus 575: list_hostkey_types(void)
576: {
1.509 djm 577: struct sshbuf *b;
578: struct sshkey *key;
1.281 jakob 579: char *ret;
1.493 djm 580: u_int i;
1.223 markus 581:
1.509 djm 582: if ((b = sshbuf_new()) == NULL)
583: fatal("%s: sshbuf_new failed", __func__);
1.217 deraadt 584: for (i = 0; i < options.num_host_key_files; i++) {
1.373 djm 585: key = sensitive_data.host_keys[i];
1.443 djm 586: if (key == NULL)
1.404 markus 587: key = sensitive_data.host_pubkeys[i];
1.472 markus 588: if (key == NULL)
1.134 markus 589: continue;
1.214 deraadt 590: switch (key->type) {
1.134 markus 591: case KEY_RSA:
1.509 djm 592: /* for RSA we also support SHA2 signatures */
593: append_hostkey_type(b, "rsa-sha2-512");
594: append_hostkey_type(b, "rsa-sha2-256");
595: /* FALLTHROUGH */
1.134 markus 596: case KEY_DSA:
1.378 djm 597: case KEY_ECDSA:
1.412 markus 598: case KEY_ED25519:
1.542 djm 599: case KEY_ECDSA_SK:
600: case KEY_ED25519_SK:
1.505 markus 601: case KEY_XMSS:
1.509 djm 602: append_hostkey_type(b, sshkey_ssh_name(key));
1.134 markus 603: break;
604: }
1.373 djm 605: /* If the private key has a cert peer, then list that too */
606: key = sensitive_data.host_certificates[i];
607: if (key == NULL)
608: continue;
609: switch (key->type) {
610: case KEY_RSA_CERT:
1.509 djm 611: /* for RSA we also support SHA2 signatures */
612: append_hostkey_type(b,
613: "rsa-sha2-512-cert-v01@openssh.com");
614: append_hostkey_type(b,
615: "rsa-sha2-256-cert-v01@openssh.com");
616: /* FALLTHROUGH */
1.373 djm 617: case KEY_DSA_CERT:
1.378 djm 618: case KEY_ECDSA_CERT:
1.412 markus 619: case KEY_ED25519_CERT:
1.542 djm 620: case KEY_ECDSA_SK_CERT:
621: case KEY_ED25519_SK_CERT:
1.505 markus 622: case KEY_XMSS_CERT:
1.509 djm 623: append_hostkey_type(b, sshkey_ssh_name(key));
1.373 djm 624: break;
625: }
1.134 markus 626: }
1.509 djm 627: if ((ret = sshbuf_dup_string(b)) == NULL)
1.467 djm 628: fatal("%s: sshbuf_dup_string failed", __func__);
1.509 djm 629: sshbuf_free(b);
630: debug("%s: %s", __func__, ret);
1.281 jakob 631: return ret;
1.134 markus 632: }
633:
1.488 markus 634: static struct sshkey *
1.440 djm 635: get_hostkey_by_type(int type, int nid, int need_private, struct ssh *ssh)
1.134 markus 636: {
1.493 djm 637: u_int i;
1.488 markus 638: struct sshkey *key;
1.250 deraadt 639:
1.217 deraadt 640: for (i = 0; i < options.num_host_key_files; i++) {
1.375 djm 641: switch (type) {
642: case KEY_RSA_CERT:
643: case KEY_DSA_CERT:
1.378 djm 644: case KEY_ECDSA_CERT:
1.412 markus 645: case KEY_ED25519_CERT:
1.542 djm 646: case KEY_ECDSA_SK_CERT:
647: case KEY_ED25519_SK_CERT:
1.505 markus 648: case KEY_XMSS_CERT:
1.373 djm 649: key = sensitive_data.host_certificates[i];
1.375 djm 650: break;
651: default:
1.373 djm 652: key = sensitive_data.host_keys[i];
1.404 markus 653: if (key == NULL && !need_private)
654: key = sensitive_data.host_pubkeys[i];
1.375 djm 655: break;
656: }
1.542 djm 657: if (key == NULL || key->type != type)
658: continue;
659: switch (type) {
660: case KEY_ECDSA:
661: case KEY_ECDSA_SK:
662: case KEY_ECDSA_CERT:
663: case KEY_ECDSA_SK_CERT:
664: if (key->ecdsa_nid != nid)
665: continue;
666: /* FALLTHROUGH */
667: default:
1.373 djm 668: return need_private ?
669: sensitive_data.host_keys[i] : key;
1.542 djm 670: }
1.134 markus 671: }
672: return NULL;
1.96 markus 673: }
674:
1.488 markus 675: struct sshkey *
1.440 djm 676: get_hostkey_public_by_type(int type, int nid, struct ssh *ssh)
1.373 djm 677: {
1.440 djm 678: return get_hostkey_by_type(type, nid, 0, ssh);
1.373 djm 679: }
680:
1.488 markus 681: struct sshkey *
1.440 djm 682: get_hostkey_private_by_type(int type, int nid, struct ssh *ssh)
1.373 djm 683: {
1.440 djm 684: return get_hostkey_by_type(type, nid, 1, ssh);
1.373 djm 685: }
686:
1.488 markus 687: struct sshkey *
1.231 provos 688: get_hostkey_by_index(int ind)
689: {
1.493 djm 690: if (ind < 0 || (u_int)ind >= options.num_host_key_files)
1.231 provos 691: return (NULL);
692: return (sensitive_data.host_keys[ind]);
693: }
694:
1.488 markus 695: struct sshkey *
1.435 markus 696: get_hostkey_public_by_index(int ind, struct ssh *ssh)
1.404 markus 697: {
1.493 djm 698: if (ind < 0 || (u_int)ind >= options.num_host_key_files)
1.404 markus 699: return (NULL);
700: return (sensitive_data.host_pubkeys[ind]);
701: }
702:
1.231 provos 703: int
1.488 markus 704: get_hostkey_index(struct sshkey *key, int compare, struct ssh *ssh)
1.231 provos 705: {
1.493 djm 706: u_int i;
1.250 deraadt 707:
1.231 provos 708: for (i = 0; i < options.num_host_key_files; i++) {
1.512 markus 709: if (sshkey_is_cert(key)) {
1.442 djm 710: if (key == sensitive_data.host_certificates[i] ||
711: (compare && sensitive_data.host_certificates[i] &&
712: sshkey_equal(key,
713: sensitive_data.host_certificates[i])))
1.373 djm 714: return (i);
715: } else {
1.442 djm 716: if (key == sensitive_data.host_keys[i] ||
717: (compare && sensitive_data.host_keys[i] &&
718: sshkey_equal(key, sensitive_data.host_keys[i])))
1.373 djm 719: return (i);
1.442 djm 720: if (key == sensitive_data.host_pubkeys[i] ||
721: (compare && sensitive_data.host_pubkeys[i] &&
722: sshkey_equal(key, sensitive_data.host_pubkeys[i])))
1.404 markus 723: return (i);
1.373 djm 724: }
1.231 provos 725: }
726: return (-1);
727: }
728:
1.439 djm 729: /* Inform the client of all hostkeys */
730: static void
731: notify_hostkeys(struct ssh *ssh)
732: {
733: struct sshbuf *buf;
734: struct sshkey *key;
1.493 djm 735: u_int i, nkeys;
736: int r;
1.439 djm 737: char *fp;
1.446 dtucker 738:
739: /* Some clients cannot cope with the hostkeys message, skip those. */
1.527 djm 740: if (ssh->compat & SSH_BUG_HOSTKEYS)
1.446 dtucker 741: return;
1.439 djm 742:
743: if ((buf = sshbuf_new()) == NULL)
744: fatal("%s: sshbuf_new", __func__);
745: for (i = nkeys = 0; i < options.num_host_key_files; i++) {
746: key = get_hostkey_public_by_index(i, ssh);
747: if (key == NULL || key->type == KEY_UNSPEC ||
1.472 markus 748: sshkey_is_cert(key))
1.439 djm 749: continue;
750: fp = sshkey_fingerprint(key, options.fingerprint_hash,
751: SSH_FP_DEFAULT);
752: debug3("%s: key %d: %s %s", __func__, i,
753: sshkey_ssh_name(key), fp);
754: free(fp);
1.442 djm 755: if (nkeys == 0) {
1.525 djm 756: /*
757: * Start building the request when we find the
758: * first usable key.
759: */
760: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
761: (r = sshpkt_put_cstring(ssh, "hostkeys-00@openssh.com")) != 0 ||
762: (r = sshpkt_put_u8(ssh, 0)) != 0) /* want reply */
763: sshpkt_fatal(ssh, r, "%s: start request", __func__);
1.442 djm 764: }
1.525 djm 765: /* Append the key to the request */
1.442 djm 766: sshbuf_reset(buf);
767: if ((r = sshkey_putb(key, buf)) != 0)
1.439 djm 768: fatal("%s: couldn't put hostkey %d: %s",
769: __func__, i, ssh_err(r));
1.525 djm 770: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
771: sshpkt_fatal(ssh, r, "%s: append key", __func__);
1.439 djm 772: nkeys++;
773: }
1.493 djm 774: debug3("%s: sent %u hostkeys", __func__, nkeys);
1.439 djm 775: if (nkeys == 0)
776: fatal("%s: no hostkeys", __func__);
1.525 djm 777: if ((r = sshpkt_send(ssh)) != 0)
778: sshpkt_fatal(ssh, r, "%s: send", __func__);
1.442 djm 779: sshbuf_free(buf);
1.439 djm 780: }
781:
1.124 markus 782: /*
783: * returns 1 if connection should be dropped, 0 otherwise.
784: * dropping starts at connection #max_startups_begin with a probability
785: * of (max_startups_rate/100). the probability increases linearly until
786: * all connections are dropped for startups > max_startups
787: */
1.200 itojun 788: static int
1.124 markus 789: drop_connection(int startups)
790: {
1.303 mickey 791: int p, r;
1.124 markus 792:
793: if (startups < options.max_startups_begin)
794: return 0;
795: if (startups >= options.max_startups)
796: return 1;
797: if (options.max_startups_rate == 100)
798: return 1;
799:
800: p = 100 - options.max_startups_rate;
801: p *= startups - options.max_startups_begin;
1.303 mickey 802: p /= options.max_startups - options.max_startups_begin;
1.124 markus 803: p += options.max_startups_rate;
1.356 djm 804: r = arc4random_uniform(100);
1.124 markus 805:
1.304 djm 806: debug("drop_connection: p %d, r %d", p, r);
1.124 markus 807: return (r < p) ? 1 : 0;
808: }
809:
1.215 markus 810: static void
811: usage(void)
812: {
1.290 markus 813: fprintf(stderr, "%s, %s\n",
1.426 markus 814: SSH_VERSION,
815: #ifdef WITH_OPENSSL
1.517 djm 816: OpenSSL_version(OPENSSL_VERSION)
1.426 markus 817: #else
818: "without OpenSSL"
819: #endif
820: );
1.289 markus 821: fprintf(stderr,
1.473 naddy 822: "usage: sshd [-46DdeiqTt] [-C connection_spec] [-c host_cert_file]\n"
1.399 dtucker 823: " [-E log_file] [-f config_file] [-g login_grace_time]\n"
1.473 naddy 824: " [-h host_key_file] [-o option] [-p port] [-u len]\n"
1.289 markus 825: );
1.215 markus 826: exit(1);
827: }
828:
1.294 djm 829: static void
1.467 djm 830: send_rexec_state(int fd, struct sshbuf *conf)
1.294 djm 831: {
1.467 djm 832: struct sshbuf *m;
833: int r;
1.294 djm 834:
1.467 djm 835: debug3("%s: entering fd = %d config len %zu", __func__, fd,
836: sshbuf_len(conf));
1.294 djm 837:
838: /*
839: * Protocol from reexec master to child:
840: * string configuration
841: */
1.467 djm 842: if ((m = sshbuf_new()) == NULL)
843: fatal("%s: sshbuf_new failed", __func__);
844: if ((r = sshbuf_put_stringb(m, conf)) != 0)
845: fatal("%s: buffer error: %s", __func__, ssh_err(r));
846: if (ssh_msg_send(fd, 0, m) == -1)
1.294 djm 847: fatal("%s: ssh_msg_send failed", __func__);
848:
1.467 djm 849: sshbuf_free(m);
1.294 djm 850:
851: debug3("%s: done", __func__);
852: }
853:
854: static void
1.511 markus 855: recv_rexec_state(int fd, struct sshbuf *conf)
1.294 djm 856: {
1.511 markus 857: struct sshbuf *m;
858: u_char *cp, ver;
859: size_t len;
860: int r;
1.294 djm 861:
862: debug3("%s: entering fd = %d", __func__, fd);
863:
1.511 markus 864: if ((m = sshbuf_new()) == NULL)
865: fatal("%s: sshbuf_new failed", __func__);
866: if (ssh_msg_recv(fd, m) == -1)
1.294 djm 867: fatal("%s: ssh_msg_recv failed", __func__);
1.511 markus 868: if ((r = sshbuf_get_u8(m, &ver)) != 0)
869: fatal("%s: buffer error: %s", __func__, ssh_err(r));
870: if (ver != 0)
1.294 djm 871: fatal("%s: rexec version mismatch", __func__);
1.511 markus 872: if ((r = sshbuf_get_string(m, &cp, &len)) != 0)
873: fatal("%s: buffer error: %s", __func__, ssh_err(r));
874: if (conf != NULL && (r = sshbuf_put(conf, cp, len)))
875: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.294 djm 876:
1.402 djm 877: free(cp);
1.511 markus 878: sshbuf_free(m);
1.294 djm 879:
880: debug3("%s: done", __func__);
881: }
882:
1.345 djm 883: /* Accept a connection from inetd */
884: static void
885: server_accept_inetd(int *sock_in, int *sock_out)
886: {
887: int fd;
888:
889: if (rexeced_flag) {
890: close(REEXEC_CONFIG_PASS_FD);
891: *sock_in = *sock_out = dup(STDIN_FILENO);
892: } else {
893: *sock_in = dup(STDIN_FILENO);
894: *sock_out = dup(STDOUT_FILENO);
895: }
896: /*
897: * We intentionally do not close the descriptors 0, 1, and 2
898: * as our code for setting the descriptors won't work if
899: * ttyfd happens to be one of those.
900: */
901: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
902: dup2(fd, STDIN_FILENO);
903: dup2(fd, STDOUT_FILENO);
1.403 dtucker 904: if (!log_stderr)
905: dup2(fd, STDERR_FILENO);
906: if (fd > (log_stderr ? STDERR_FILENO : STDOUT_FILENO))
1.345 djm 907: close(fd);
908: }
909: debug("inetd sockets after dupping: %d, %d", *sock_in, *sock_out);
910: }
911:
912: /*
913: * Listen for TCP connections
914: */
915: static void
1.494 djm 916: listen_on_addrs(struct listenaddr *la)
1.345 djm 917: {
1.494 djm 918: int ret, listen_sock;
1.345 djm 919: struct addrinfo *ai;
920: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
921:
1.494 djm 922: for (ai = la->addrs; ai; ai = ai->ai_next) {
1.345 djm 923: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
924: continue;
925: if (num_listen_socks >= MAX_LISTEN_SOCKS)
926: fatal("Too many listen sockets. "
927: "Enlarge MAX_LISTEN_SOCKS");
928: if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen,
929: ntop, sizeof(ntop), strport, sizeof(strport),
930: NI_NUMERICHOST|NI_NUMERICSERV)) != 0) {
931: error("getnameinfo failed: %.100s",
1.352 dtucker 932: ssh_gai_strerror(ret));
1.345 djm 933: continue;
934: }
935: /* Create socket for listening. */
1.370 dtucker 936: listen_sock = socket(ai->ai_family, ai->ai_socktype,
937: ai->ai_protocol);
1.537 deraadt 938: if (listen_sock == -1) {
1.345 djm 939: /* kernel may not support ipv6 */
940: verbose("socket: %.100s", strerror(errno));
941: continue;
942: }
943: if (set_nonblock(listen_sock) == -1) {
1.483 djm 944: close(listen_sock);
945: continue;
946: }
947: if (fcntl(listen_sock, F_SETFD, FD_CLOEXEC) == -1) {
948: verbose("socket: CLOEXEC: %s", strerror(errno));
1.345 djm 949: close(listen_sock);
950: continue;
951: }
1.494 djm 952: /* Socket options */
953: set_reuseaddr(listen_sock);
954: if (la->rdomain != NULL &&
955: set_rdomain(listen_sock, la->rdomain) == -1) {
956: close(listen_sock);
957: continue;
958: }
1.345 djm 959:
960: debug("Bind to port %s on %s.", strport, ntop);
961:
962: /* Bind the socket to the desired port. */
1.537 deraadt 963: if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) == -1) {
1.345 djm 964: error("Bind to port %s on %s failed: %.200s.",
965: strport, ntop, strerror(errno));
966: close(listen_sock);
967: continue;
968: }
969: listen_socks[num_listen_socks] = listen_sock;
970: num_listen_socks++;
971:
972: /* Start listening on the port. */
1.537 deraadt 973: if (listen(listen_sock, SSH_LISTEN_BACKLOG) == -1)
1.345 djm 974: fatal("listen on [%s]:%s: %.100s",
975: ntop, strport, strerror(errno));
1.494 djm 976: logit("Server listening on %s port %s%s%s.",
977: ntop, strport,
978: la->rdomain == NULL ? "" : " rdomain ",
979: la->rdomain == NULL ? "" : la->rdomain);
1.345 djm 980: }
1.494 djm 981: }
982:
983: static void
984: server_listen(void)
985: {
986: u_int i;
987:
988: for (i = 0; i < options.num_listen_addrs; i++) {
989: listen_on_addrs(&options.listen_addrs[i]);
990: freeaddrinfo(options.listen_addrs[i].addrs);
991: free(options.listen_addrs[i].rdomain);
992: memset(&options.listen_addrs[i], 0,
993: sizeof(options.listen_addrs[i]));
994: }
995: free(options.listen_addrs);
996: options.listen_addrs = NULL;
997: options.num_listen_addrs = 0;
1.345 djm 998:
999: if (!num_listen_socks)
1000: fatal("Cannot bind any address.");
1001: }
1002:
1003: /*
1004: * The main TCP accept loop. Note that, for the non-debug case, returns
1005: * from this function are in a forked subprocess.
1006: */
1007: static void
1008: server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s)
1009: {
1010: fd_set *fdset;
1011: int i, j, ret, maxfd;
1.543 djm 1012: int ostartups = -1, startups = 0, listening = 0, lameduck = 0;
1.345 djm 1013: int startup_p[2] = { -1 , -1 };
1.533 djm 1014: char c = 0;
1.345 djm 1015: struct sockaddr_storage from;
1016: socklen_t fromlen;
1017: pid_t pid;
1018:
1019: /* setup fd set for accept */
1020: fdset = NULL;
1021: maxfd = 0;
1022: for (i = 0; i < num_listen_socks; i++)
1023: if (listen_socks[i] > maxfd)
1024: maxfd = listen_socks[i];
1025: /* pipes connected to unauthenticated childs */
1026: startup_pipes = xcalloc(options.max_startups, sizeof(int));
1.533 djm 1027: startup_flags = xcalloc(options.max_startups, sizeof(int));
1.345 djm 1028: for (i = 0; i < options.max_startups; i++)
1029: startup_pipes[i] = -1;
1030:
1031: /*
1032: * Stay listening for connections until the system crashes or
1033: * the daemon is killed with a signal.
1034: */
1035: for (;;) {
1.543 djm 1036: if (ostartups != startups) {
1.545 ! djm 1037: setproctitle("%s [listener] %d of %d-%d startups",
! 1038: listener_proctitle, startups,
! 1039: options.max_startups_begin, options.max_startups);
1.543 djm 1040: ostartups = startups;
1041: }
1.533 djm 1042: if (received_sighup) {
1043: if (!lameduck) {
1044: debug("Received SIGHUP; waiting for children");
1045: close_listen_socks();
1046: lameduck = 1;
1047: }
1048: if (listening <= 0)
1049: sighup_restart();
1050: }
1.462 mmcc 1051: free(fdset);
1.458 deraadt 1052: fdset = xcalloc(howmany(maxfd + 1, NFDBITS),
1.345 djm 1053: sizeof(fd_mask));
1054:
1055: for (i = 0; i < num_listen_socks; i++)
1056: FD_SET(listen_socks[i], fdset);
1057: for (i = 0; i < options.max_startups; i++)
1058: if (startup_pipes[i] != -1)
1059: FD_SET(startup_pipes[i], fdset);
1060:
1061: /* Wait in select until there is a connection. */
1062: ret = select(maxfd+1, fdset, NULL, NULL, NULL);
1.537 deraadt 1063: if (ret == -1 && errno != EINTR)
1.345 djm 1064: error("select: %.100s", strerror(errno));
1065: if (received_sigterm) {
1066: logit("Received signal %d; terminating.",
1067: (int) received_sigterm);
1068: close_listen_socks();
1.430 djm 1069: if (options.pid_file != NULL)
1070: unlink(options.pid_file);
1.382 djm 1071: exit(received_sigterm == SIGTERM ? 0 : 255);
1.345 djm 1072: }
1.537 deraadt 1073: if (ret == -1)
1.345 djm 1074: continue;
1075:
1.533 djm 1076: for (i = 0; i < options.max_startups; i++) {
1077: if (startup_pipes[i] == -1 ||
1078: !FD_ISSET(startup_pipes[i], fdset))
1079: continue;
1080: switch (read(startup_pipes[i], &c, sizeof(c))) {
1081: case -1:
1082: if (errno == EINTR || errno == EAGAIN)
1083: continue;
1084: if (errno != EPIPE) {
1085: error("%s: startup pipe %d (fd=%d): "
1086: "read %s", __func__, i,
1087: startup_pipes[i], strerror(errno));
1088: }
1089: /* FALLTHROUGH */
1090: case 0:
1091: /* child exited or completed auth */
1.345 djm 1092: close(startup_pipes[i]);
1093: startup_pipes[i] = -1;
1094: startups--;
1.533 djm 1095: if (startup_flags[i])
1096: listening--;
1097: break;
1098: case 1:
1099: /* child has finished preliminaries */
1100: if (startup_flags[i]) {
1101: listening--;
1102: startup_flags[i] = 0;
1103: }
1104: break;
1.345 djm 1105: }
1.533 djm 1106: }
1.345 djm 1107: for (i = 0; i < num_listen_socks; i++) {
1108: if (!FD_ISSET(listen_socks[i], fdset))
1109: continue;
1110: fromlen = sizeof(from);
1111: *newsock = accept(listen_socks[i],
1112: (struct sockaddr *)&from, &fromlen);
1.537 deraadt 1113: if (*newsock == -1) {
1.398 markus 1114: if (errno != EINTR && errno != EWOULDBLOCK &&
1115: errno != ECONNABORTED)
1.389 djm 1116: error("accept: %.100s",
1117: strerror(errno));
1118: if (errno == EMFILE || errno == ENFILE)
1119: usleep(100 * 1000);
1.345 djm 1120: continue;
1121: }
1122: if (unset_nonblock(*newsock) == -1) {
1123: close(*newsock);
1124: continue;
1125: }
1126: if (drop_connection(startups) == 1) {
1.480 djm 1127: char *laddr = get_local_ipaddr(*newsock);
1128: char *raddr = get_peer_ipaddr(*newsock);
1.540 dtucker 1129: char msg[] = "Exceeded MaxStartups\r\n";
1.480 djm 1130:
1131: verbose("drop connection #%d from [%s]:%d "
1132: "on [%s]:%d past MaxStartups", startups,
1133: raddr, get_peer_port(*newsock),
1134: laddr, get_local_port(*newsock));
1135: free(laddr);
1136: free(raddr);
1.540 dtucker 1137: /* best-effort notification to client */
1138: (void)write(*newsock, msg, strlen(msg));
1.345 djm 1139: close(*newsock);
1140: continue;
1141: }
1142: if (pipe(startup_p) == -1) {
1143: close(*newsock);
1144: continue;
1145: }
1146:
1147: if (rexec_flag && socketpair(AF_UNIX,
1148: SOCK_STREAM, 0, config_s) == -1) {
1149: error("reexec socketpair: %s",
1150: strerror(errno));
1151: close(*newsock);
1152: close(startup_p[0]);
1153: close(startup_p[1]);
1154: continue;
1155: }
1156:
1157: for (j = 0; j < options.max_startups; j++)
1158: if (startup_pipes[j] == -1) {
1159: startup_pipes[j] = startup_p[0];
1160: if (maxfd < startup_p[0])
1161: maxfd = startup_p[0];
1162: startups++;
1.533 djm 1163: startup_flags[j] = 1;
1.345 djm 1164: break;
1165: }
1166:
1167: /*
1168: * Got connection. Fork a child to handle it, unless
1169: * we are in debugging mode.
1170: */
1171: if (debug_flag) {
1172: /*
1173: * In debugging mode. Close the listening
1174: * socket, and start processing the
1175: * connection without forking.
1176: */
1177: debug("Server will not fork when running in debugging mode.");
1178: close_listen_socks();
1179: *sock_in = *newsock;
1180: *sock_out = *newsock;
1181: close(startup_p[0]);
1182: close(startup_p[1]);
1183: startup_pipe = -1;
1184: pid = getpid();
1185: if (rexec_flag) {
1.511 markus 1186: send_rexec_state(config_s[0], cfg);
1.345 djm 1187: close(config_s[0]);
1188: }
1.533 djm 1189: return;
1.345 djm 1190: }
1191:
1192: /*
1193: * Normal production daemon. Fork, and have
1194: * the child process the connection. The
1195: * parent continues listening.
1196: */
1.533 djm 1197: listening++;
1.345 djm 1198: if ((pid = fork()) == 0) {
1199: /*
1200: * Child. Close the listening and
1201: * max_startup sockets. Start using
1202: * the accepted socket. Reinitialize
1203: * logging (since our pid has changed).
1.533 djm 1204: * We return from this function to handle
1.345 djm 1205: * the connection.
1206: */
1207: startup_pipe = startup_p[1];
1208: close_startup_pipes();
1209: close_listen_socks();
1210: *sock_in = *newsock;
1211: *sock_out = *newsock;
1212: log_init(__progname,
1213: options.log_level,
1214: options.log_facility,
1215: log_stderr);
1216: if (rexec_flag)
1217: close(config_s[0]);
1.533 djm 1218: else {
1219: /*
1220: * Signal parent that the preliminaries
1221: * for this child are complete. For the
1222: * re-exec case, this happens after the
1223: * child has received the rexec state
1224: * from the server.
1225: */
1226: (void)atomicio(vwrite, startup_pipe,
1227: "\0", 1);
1228: }
1229: return;
1.345 djm 1230: }
1231:
1232: /* Parent. Stay in the loop. */
1.537 deraadt 1233: if (pid == -1)
1.345 djm 1234: error("fork: %.100s", strerror(errno));
1235: else
1236: debug("Forked child %ld.", (long)pid);
1237:
1238: close(startup_p[1]);
1239:
1240: if (rexec_flag) {
1.511 markus 1241: send_rexec_state(config_s[0], cfg);
1.345 djm 1242: close(config_s[0]);
1243: close(config_s[1]);
1244: }
1245: close(*newsock);
1246: }
1247: }
1248: }
1249:
1.466 djm 1250: /*
1251: * If IP options are supported, make sure there are none (log and
1252: * return an error if any are found). Basically we are worried about
1253: * source routing; it can be used to pretend you are somebody
1254: * (ip-address) you are not. That itself may be "almost acceptable"
1.507 djm 1255: * under certain circumstances, but rhosts authentication is useless
1.466 djm 1256: * if source routing is accepted. Notice also that if we just dropped
1257: * source routing here, the other side could use IP spoofing to do
1258: * rest of the interaction and could still bypass security. So we
1259: * exit here if we detect any IP options.
1260: */
1261: static void
1262: check_ip_options(struct ssh *ssh)
1263: {
1264: int sock_in = ssh_packet_get_connection_in(ssh);
1265: struct sockaddr_storage from;
1266: u_char opts[200];
1.475 djm 1267: socklen_t i, option_size = sizeof(opts), fromlen = sizeof(from);
1.466 djm 1268: char text[sizeof(opts) * 3 + 1];
1269:
1270: memset(&from, 0, sizeof(from));
1271: if (getpeername(sock_in, (struct sockaddr *)&from,
1.537 deraadt 1272: &fromlen) == -1)
1.466 djm 1273: return;
1274: if (from.ss_family != AF_INET)
1275: return;
1276: /* XXX IPv6 options? */
1277:
1278: if (getsockopt(sock_in, IPPROTO_IP, IP_OPTIONS, opts,
1279: &option_size) >= 0 && option_size != 0) {
1280: text[0] = '\0';
1281: for (i = 0; i < option_size; i++)
1282: snprintf(text + i*3, sizeof(text) - i*3,
1283: " %2.2x", opts[i]);
1284: fatal("Connection from %.100s port %d with IP opts: %.800s",
1285: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text);
1286: }
1287: return;
1288: }
1.345 djm 1289:
1.495 djm 1290: /* Set the routing domain for this process */
1291: static void
1292: set_process_rdomain(struct ssh *ssh, const char *name)
1293: {
1294: int rtable, ortable = getrtable();
1295: const char *errstr;
1296:
1297: if (name == NULL)
1298: return; /* default */
1299:
1300: if (strcmp(name, "%D") == 0) {
1301: /* "expands" to routing domain of connection */
1302: if ((name = ssh_packet_rdomain_in(ssh)) == NULL)
1303: return;
1304: }
1305:
1306: rtable = (int)strtonum(name, 0, 255, &errstr);
1307: if (errstr != NULL) /* Shouldn't happen */
1308: fatal("Invalid routing domain \"%s\": %s", name, errstr);
1309: if (rtable != ortable && setrtable(rtable) != 0)
1310: fatal("Unable to set routing domain %d: %s",
1311: rtable, strerror(errno));
1312: debug("%s: set routing domain %d (was %d)", __func__, rtable, ortable);
1313: }
1314:
1.508 dtucker 1315: static void
1316: accumulate_host_timing_secret(struct sshbuf *server_cfg,
1.536 djm 1317: struct sshkey *key)
1.508 dtucker 1318: {
1319: static struct ssh_digest_ctx *ctx;
1320: u_char *hash;
1321: size_t len;
1322: struct sshbuf *buf;
1323: int r;
1324:
1325: if (ctx == NULL && (ctx = ssh_digest_start(SSH_DIGEST_SHA512)) == NULL)
1326: fatal("%s: ssh_digest_start", __func__);
1327: if (key == NULL) { /* finalize */
1328: /* add server config in case we are using agent for host keys */
1329: if (ssh_digest_update(ctx, sshbuf_ptr(server_cfg),
1330: sshbuf_len(server_cfg)) != 0)
1331: fatal("%s: ssh_digest_update", __func__);
1332: len = ssh_digest_bytes(SSH_DIGEST_SHA512);
1333: hash = xmalloc(len);
1334: if (ssh_digest_final(ctx, hash, len) != 0)
1335: fatal("%s: ssh_digest_final", __func__);
1336: options.timing_secret = PEEK_U64(hash);
1337: freezero(hash, len);
1338: ssh_digest_free(ctx);
1339: ctx = NULL;
1340: return;
1341: }
1342: if ((buf = sshbuf_new()) == NULL)
1343: fatal("%s could not allocate buffer", __func__);
1344: if ((r = sshkey_private_serialize(key, buf)) != 0)
1345: fatal("sshkey_private_serialize: %s", ssh_err(r));
1346: if (ssh_digest_update(ctx, sshbuf_ptr(buf), sshbuf_len(buf)) != 0)
1347: fatal("%s: ssh_digest_update", __func__);
1348: sshbuf_reset(buf);
1349: sshbuf_free(buf);
1350: }
1351:
1.545 ! djm 1352: static char *
! 1353: prepare_proctitle(int ac, char **av)
! 1354: {
! 1355: char *ret = NULL;
! 1356: int i;
! 1357:
! 1358: for (i = 0; i < ac; i++)
! 1359: xextendf(&ret, " ", "%s", av[i]);
! 1360: return ret;
! 1361: }
! 1362:
1.65 deraadt 1363: /*
1364: * Main program for the daemon.
1365: */
1.2 provos 1366: int
1367: main(int ac, char **av)
1.1 deraadt 1368: {
1.466 djm 1369: struct ssh *ssh = NULL;
1.64 markus 1370: extern char *optarg;
1371: extern int optind;
1.493 djm 1372: int r, opt, on = 1, already_daemon, remote_port;
1.297 avsm 1373: int sock_in = -1, sock_out = -1, newsock = -1;
1.496 djm 1374: const char *remote_ip, *rdomain;
1.447 dtucker 1375: char *fp, *line, *laddr, *logfile = NULL;
1.345 djm 1376: int config_s[2] = { -1 , -1 };
1.493 djm 1377: u_int i, j;
1.364 markus 1378: u_int64_t ibytes, obytes;
1.362 dtucker 1379: mode_t new_umask;
1.488 markus 1380: struct sshkey *key;
1381: struct sshkey *pubkey;
1.404 markus 1382: int keytype;
1.230 provos 1383: Authctxt *authctxt;
1.498 dtucker 1384: struct connection_info *connection_info = NULL;
1.64 markus 1385:
1.138 markus 1386: /* Save argv. */
1.64 markus 1387: saved_argv = av;
1.294 djm 1388: rexec_argc = ac;
1.313 djm 1389:
1390: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1391: sanitise_stdfd();
1.64 markus 1392:
1393: /* Initialize configuration options to their default values. */
1394: initialize_server_options(&options);
1395:
1396: /* Parse command-line arguments. */
1.450 djm 1397: while ((opt = getopt(ac, av,
1398: "C:E:b:c:f:g:h:k:o:p:u:46DQRTdeiqrt")) != -1) {
1.64 markus 1399: switch (opt) {
1.75 markus 1400: case '4':
1.305 djm 1401: options.address_family = AF_INET;
1.75 markus 1402: break;
1403: case '6':
1.305 djm 1404: options.address_family = AF_INET6;
1.75 markus 1405: break;
1.64 markus 1406: case 'f':
1407: config_file_name = optarg;
1408: break;
1.373 djm 1409: case 'c':
1.493 djm 1410: servconf_add_hostcert("[command-line]", 0,
1411: &options, optarg);
1.373 djm 1412: break;
1.64 markus 1413: case 'd':
1.273 markus 1414: if (debug_flag == 0) {
1.127 markus 1415: debug_flag = 1;
1416: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.273 markus 1417: } else if (options.log_level < SYSLOG_LEVEL_DEBUG3)
1.127 markus 1418: options.log_level++;
1.64 markus 1419: break;
1.135 markus 1420: case 'D':
1421: no_daemon_flag = 1;
1.192 lebel 1422: break;
1.399 dtucker 1423: case 'E':
1.459 dtucker 1424: logfile = optarg;
1.399 dtucker 1425: /* FALLTHROUGH */
1.192 lebel 1426: case 'e':
1427: log_stderr = 1;
1.135 markus 1428: break;
1.64 markus 1429: case 'i':
1430: inetd_flag = 1;
1431: break;
1.294 djm 1432: case 'r':
1433: rexec_flag = 0;
1434: break;
1435: case 'R':
1436: rexeced_flag = 1;
1437: inetd_flag = 1;
1438: break;
1.64 markus 1439: case 'Q':
1.158 markus 1440: /* ignored */
1.64 markus 1441: break;
1442: case 'q':
1443: options.log_level = SYSLOG_LEVEL_QUIET;
1444: break;
1445: case 'b':
1.473 naddy 1446: /* protocol 1, ignored */
1.64 markus 1447: break;
1448: case 'p':
1.75 markus 1449: options.ports_from_cmdline = 1;
1.127 markus 1450: if (options.num_ports >= MAX_PORTS) {
1451: fprintf(stderr, "too many ports.\n");
1452: exit(1);
1453: }
1.193 stevesk 1454: options.ports[options.num_ports++] = a2port(optarg);
1.366 djm 1455: if (options.ports[options.num_ports-1] <= 0) {
1.193 stevesk 1456: fprintf(stderr, "Bad port number.\n");
1457: exit(1);
1458: }
1.64 markus 1459: break;
1460: case 'g':
1.197 stevesk 1461: if ((options.login_grace_time = convtime(optarg)) == -1) {
1462: fprintf(stderr, "Invalid login grace time.\n");
1463: exit(1);
1464: }
1.64 markus 1465: break;
1466: case 'k':
1.473 naddy 1467: /* protocol 1, ignored */
1.64 markus 1468: break;
1469: case 'h':
1.493 djm 1470: servconf_add_hostkey("[command-line]", 0,
1.519 djm 1471: &options, optarg, 1);
1.64 markus 1472: break;
1.203 stevesk 1473: case 't':
1474: test_flag = 1;
1475: break;
1.358 dtucker 1476: case 'T':
1477: test_flag = 2;
1478: break;
1479: case 'C':
1.523 djm 1480: connection_info = get_connection_info(ssh, 0, 0);
1.391 dtucker 1481: if (parse_server_match_testspec(connection_info,
1482: optarg) == -1)
1483: exit(1);
1.358 dtucker 1484: break;
1.125 markus 1485: case 'u':
1.438 deraadt 1486: utmp_len = (u_int)strtonum(optarg, 0, HOST_NAME_MAX+1+1, NULL);
1487: if (utmp_len > HOST_NAME_MAX+1) {
1.257 stevesk 1488: fprintf(stderr, "Invalid utmp length.\n");
1489: exit(1);
1490: }
1.125 markus 1491: break;
1.215 markus 1492: case 'o':
1.283 markus 1493: line = xstrdup(optarg);
1494: if (process_server_config_line(&options, line,
1.391 dtucker 1495: "command-line", 0, NULL, NULL) != 0)
1.217 deraadt 1496: exit(1);
1.402 djm 1497: free(line);
1.215 markus 1498: break;
1.64 markus 1499: case '?':
1500: default:
1.215 markus 1501: usage();
1502: break;
1.64 markus 1503: }
1504: }
1.294 djm 1505: if (rexeced_flag || inetd_flag)
1506: rexec_flag = 0;
1.518 djm 1507: if (!test_flag && rexec_flag && !path_absolute(av[0]))
1.294 djm 1508: fatal("sshd re-exec requires execution with an absolute path");
1509: if (rexeced_flag)
1.296 djm 1510: closefrom(REEXEC_MIN_FREE_FD);
1511: else
1512: closefrom(REEXEC_DEVCRYPTO_RESERVED_FD);
1.294 djm 1513:
1.426 markus 1514: #ifdef WITH_OPENSSL
1.379 djm 1515: OpenSSL_add_all_algorithms();
1.426 markus 1516: #endif
1.64 markus 1517:
1.399 dtucker 1518: /* If requested, redirect the logs to the specified logfile. */
1.459 dtucker 1519: if (logfile != NULL)
1.399 dtucker 1520: log_redirect_stderr_to(logfile);
1.75 markus 1521: /*
1522: * Force logging to stderr until we have loaded the private host
1523: * key (unless started from inetd)
1524: */
1.138 markus 1525: log_init(__progname,
1.224 markus 1526: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1527: SYSLOG_LEVEL_INFO : options.log_level,
1528: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1529: SYSLOG_FACILITY_AUTH : options.log_facility,
1.261 markus 1530: log_stderr || !inetd_flag);
1.75 markus 1531:
1.294 djm 1532: sensitive_data.have_ssh2_key = 0;
1533:
1.358 dtucker 1534: /*
1.498 dtucker 1535: * If we're not doing an extended test do not silently ignore connection
1536: * test params.
1.358 dtucker 1537: */
1.498 dtucker 1538: if (test_flag < 2 && connection_info != NULL)
1.358 dtucker 1539: fatal("Config test connection parameter (-C) provided without "
1540: "test mode (-T)");
1541:
1.294 djm 1542: /* Fetch our configuration */
1.511 markus 1543: if ((cfg = sshbuf_new()) == NULL)
1544: fatal("%s: sshbuf_new failed", __func__);
1.533 djm 1545: if (rexeced_flag) {
1.511 markus 1546: recv_rexec_state(REEXEC_CONFIG_PASS_FD, cfg);
1.533 djm 1547: if (!debug_flag) {
1548: startup_pipe = dup(REEXEC_STARTUP_PIPE_FD);
1549: close(REEXEC_STARTUP_PIPE_FD);
1550: /*
1551: * Signal parent that this child is at a point where
1552: * they can go away if they have a SIGHUP pending.
1553: */
1554: (void)atomicio(vwrite, startup_pipe, "\0", 1);
1555: }
1556: }
1.448 djm 1557: else if (strcasecmp(config_file_name, "none") != 0)
1.511 markus 1558: load_server_config(config_file_name, cfg);
1.294 djm 1559:
1.337 dtucker 1560: parse_server_config(&options, rexeced_flag ? "rexec" : config_file_name,
1.511 markus 1561: cfg, NULL);
1.64 markus 1562:
1563: /* Fill in default values for those options not explicitly set. */
1564: fill_default_server_options(&options);
1.350 dtucker 1565:
1566: /* challenge-response is implemented via keyboard interactive */
1567: if (options.challenge_response_authentication)
1568: options.kbd_interactive_authentication = 1;
1.395 djm 1569:
1570: /* Check that options are sensible */
1571: if (options.authorized_keys_command_user == NULL &&
1572: (options.authorized_keys_command != NULL &&
1573: strcasecmp(options.authorized_keys_command, "none") != 0))
1574: fatal("AuthorizedKeysCommand set without "
1575: "AuthorizedKeysCommandUser");
1.449 djm 1576: if (options.authorized_principals_command_user == NULL &&
1577: (options.authorized_principals_command != NULL &&
1578: strcasecmp(options.authorized_principals_command, "none") != 0))
1579: fatal("AuthorizedPrincipalsCommand set without "
1580: "AuthorizedPrincipalsCommandUser");
1.396 djm 1581:
1582: /*
1583: * Check whether there is any path through configured auth methods.
1584: * Unfortunately it is not possible to verify this generally before
1585: * daemonisation in the presence of Match block, but this catches
1586: * and warns for trivial misconfigurations that could break login.
1587: */
1588: if (options.num_auth_methods != 0) {
1.493 djm 1589: for (i = 0; i < options.num_auth_methods; i++) {
1590: if (auth2_methods_valid(options.auth_methods[i],
1.396 djm 1591: 1) == 0)
1592: break;
1593: }
1.493 djm 1594: if (i >= options.num_auth_methods)
1.396 djm 1595: fatal("AuthenticationMethods cannot be satisfied by "
1596: "enabled authentication methods");
1597: }
1.305 djm 1598:
1.64 markus 1599: /* Check that there are no remaining arguments. */
1600: if (optind < ac) {
1601: fprintf(stderr, "Extra argument %s.\n", av[optind]);
1602: exit(1);
1603: }
1604:
1.397 dtucker 1605: debug("sshd version %s, %s", SSH_VERSION,
1.426 markus 1606: #ifdef WITH_OPENSSL
1.517 djm 1607: OpenSSL_version(OPENSSL_VERSION)
1.426 markus 1608: #else
1609: "without OpenSSL"
1610: #endif
1611: );
1.64 markus 1612:
1.404 markus 1613: /* load host keys */
1.329 djm 1614: sensitive_data.host_keys = xcalloc(options.num_host_key_files,
1.488 markus 1615: sizeof(struct sshkey *));
1.404 markus 1616: sensitive_data.host_pubkeys = xcalloc(options.num_host_key_files,
1.488 markus 1617: sizeof(struct sshkey *));
1.404 markus 1618:
1619: if (options.host_key_agent) {
1620: if (strcmp(options.host_key_agent, SSH_AUTHSOCKET_ENV_NAME))
1621: setenv(SSH_AUTHSOCKET_ENV_NAME,
1622: options.host_key_agent, 1);
1.433 djm 1623: if ((r = ssh_get_authentication_socket(NULL)) == 0)
1624: have_agent = 1;
1625: else
1626: error("Could not connect to agent \"%s\": %s",
1627: options.host_key_agent, ssh_err(r));
1.404 markus 1628: }
1.134 markus 1629:
1.217 deraadt 1630: for (i = 0; i < options.num_host_key_files; i++) {
1.519 djm 1631: int ll = options.host_key_file_userprovided[i] ?
1632: SYSLOG_LEVEL_ERROR : SYSLOG_LEVEL_DEBUG1;
1633:
1.430 djm 1634: if (options.host_key_files[i] == NULL)
1635: continue;
1.512 markus 1636: if ((r = sshkey_load_private(options.host_key_files[i], "",
1637: &key, NULL)) != 0 && r != SSH_ERR_SYSTEM_ERROR)
1.519 djm 1638: do_log2(ll, "Unable to load host key \"%s\": %s",
1.512 markus 1639: options.host_key_files[i], ssh_err(r));
1.542 djm 1640: if (sshkey_is_sk(key) &&
1641: key->sk_flags & SSH_SK_USER_PRESENCE_REQD) {
1642: debug("host key %s requires user presence, ignoring",
1643: options.host_key_files[i]);
1644: key->sk_flags &= ~SSH_SK_USER_PRESENCE_REQD;
1645: }
1646: if (r == 0 && key != NULL &&
1647: (r = sshkey_shield_private(key)) != 0) {
1.536 djm 1648: do_log2(ll, "Unable to shield host key \"%s\": %s",
1649: options.host_key_files[i], ssh_err(r));
1650: sshkey_free(key);
1651: key = NULL;
1652: }
1.512 markus 1653: if ((r = sshkey_load_public(options.host_key_files[i],
1654: &pubkey, NULL)) != 0 && r != SSH_ERR_SYSTEM_ERROR)
1.519 djm 1655: do_log2(ll, "Unable to load host key \"%s\": %s",
1.512 markus 1656: options.host_key_files[i], ssh_err(r));
1.439 djm 1657: if (pubkey == NULL && key != NULL)
1.515 djm 1658: if ((r = sshkey_from_private(key, &pubkey)) != 0)
1.512 markus 1659: fatal("Could not demote key: \"%s\": %s",
1660: options.host_key_files[i], ssh_err(r));
1.179 markus 1661: sensitive_data.host_keys[i] = key;
1.404 markus 1662: sensitive_data.host_pubkeys[i] = pubkey;
1663:
1.472 markus 1664: if (key == NULL && pubkey != NULL && have_agent) {
1.443 djm 1665: debug("will rely on agent for hostkey %s",
1666: options.host_key_files[i]);
1.404 markus 1667: keytype = pubkey->type;
1668: } else if (key != NULL) {
1669: keytype = key->type;
1.511 markus 1670: accumulate_host_timing_secret(cfg, key);
1.404 markus 1671: } else {
1.519 djm 1672: do_log2(ll, "Unable to load host key: %s",
1.195 markus 1673: options.host_key_files[i]);
1.179 markus 1674: sensitive_data.host_keys[i] = NULL;
1.404 markus 1675: sensitive_data.host_pubkeys[i] = NULL;
1.134 markus 1676: continue;
1677: }
1.404 markus 1678:
1679: switch (keytype) {
1.134 markus 1680: case KEY_RSA:
1681: case KEY_DSA:
1.378 djm 1682: case KEY_ECDSA:
1.412 markus 1683: case KEY_ED25519:
1.542 djm 1684: case KEY_ECDSA_SK:
1685: case KEY_ED25519_SK:
1.505 markus 1686: case KEY_XMSS:
1.441 djm 1687: if (have_agent || key != NULL)
1688: sensitive_data.have_ssh2_key = 1;
1.134 markus 1689: break;
1690: }
1.441 djm 1691: if ((fp = sshkey_fingerprint(pubkey, options.fingerprint_hash,
1692: SSH_FP_DEFAULT)) == NULL)
1693: fatal("sshkey_fingerprint failed");
1694: debug("%s host key #%d: %s %s",
1.472 markus 1695: key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp);
1.441 djm 1696: free(fp);
1.134 markus 1697: }
1.511 markus 1698: accumulate_host_timing_secret(cfg, NULL);
1.472 markus 1699: if (!sensitive_data.have_ssh2_key) {
1.264 itojun 1700: logit("sshd: no hostkeys available -- exiting.");
1.64 markus 1701: exit(1);
1702: }
1703:
1.373 djm 1704: /*
1705: * Load certificates. They are stored in an array at identical
1706: * indices to the public keys that they relate to.
1707: */
1708: sensitive_data.host_certificates = xcalloc(options.num_host_key_files,
1.488 markus 1709: sizeof(struct sshkey *));
1.373 djm 1710: for (i = 0; i < options.num_host_key_files; i++)
1711: sensitive_data.host_certificates[i] = NULL;
1712:
1713: for (i = 0; i < options.num_host_cert_files; i++) {
1.430 djm 1714: if (options.host_cert_files[i] == NULL)
1715: continue;
1.512 markus 1716: if ((r = sshkey_load_public(options.host_cert_files[i],
1717: &key, NULL)) != 0) {
1718: error("Could not load host certificate \"%s\": %s",
1719: options.host_cert_files[i], ssh_err(r));
1.373 djm 1720: continue;
1721: }
1.512 markus 1722: if (!sshkey_is_cert(key)) {
1.373 djm 1723: error("Certificate file is not a certificate: %s",
1724: options.host_cert_files[i]);
1.512 markus 1725: sshkey_free(key);
1.373 djm 1726: continue;
1727: }
1728: /* Find matching private key */
1729: for (j = 0; j < options.num_host_key_files; j++) {
1.512 markus 1730: if (sshkey_equal_public(key,
1.373 djm 1731: sensitive_data.host_keys[j])) {
1732: sensitive_data.host_certificates[j] = key;
1733: break;
1734: }
1735: }
1736: if (j >= options.num_host_key_files) {
1737: error("No matching private key for certificate: %s",
1738: options.host_cert_files[i]);
1.512 markus 1739: sshkey_free(key);
1.373 djm 1740: continue;
1741: }
1742: sensitive_data.host_certificates[j] = key;
1.493 djm 1743: debug("host certificate: #%u type %d %s", j, key->type,
1.512 markus 1744: sshkey_type(key));
1.373 djm 1745: }
1.426 markus 1746:
1.244 markus 1747: if (use_privsep) {
1748: struct stat st;
1749:
1.327 deraadt 1750: if (getpwnam(SSH_PRIVSEP_USER) == NULL)
1.244 markus 1751: fatal("Privilege separation user %s does not exist",
1752: SSH_PRIVSEP_USER);
1.500 djm 1753: endpwent();
1.244 markus 1754: if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) ||
1755: (S_ISDIR(st.st_mode) == 0))
1756: fatal("Missing privilege separation directory: %s",
1.247 stevesk 1757: _PATH_PRIVSEP_CHROOT_DIR);
1758: if (st.st_uid != 0 || (st.st_mode & (S_IWGRP|S_IWOTH)) != 0)
1.262 markus 1759: fatal("%s must be owned by root and not group or "
1760: "world-writable.", _PATH_PRIVSEP_CHROOT_DIR);
1.358 dtucker 1761: }
1762:
1763: if (test_flag > 1) {
1.499 djm 1764: /*
1765: * If no connection info was provided by -C then use
1766: * use a blank one that will cause no predicate to match.
1767: */
1768: if (connection_info == NULL)
1.523 djm 1769: connection_info = get_connection_info(ssh, 0, 0);
1.534 dtucker 1770: connection_info->test = 1;
1.498 dtucker 1771: parse_server_match_config(&options, connection_info);
1.358 dtucker 1772: dump_config(&options);
1.108 markus 1773: }
1.203 stevesk 1774:
1775: /* Configuration looks good, so exit if in test mode. */
1776: if (test_flag)
1777: exit(0);
1.108 markus 1778:
1.294 djm 1779: if (rexec_flag) {
1.493 djm 1780: if (rexec_argc < 0)
1781: fatal("rexec_argc %d < 0", rexec_argc);
1.329 djm 1782: rexec_argv = xcalloc(rexec_argc + 2, sizeof(char *));
1.493 djm 1783: for (i = 0; i < (u_int)rexec_argc; i++) {
1.294 djm 1784: debug("rexec_argv[%d]='%s'", i, saved_argv[i]);
1785: rexec_argv[i] = saved_argv[i];
1786: }
1787: rexec_argv[rexec_argc] = "-R";
1788: rexec_argv[rexec_argc + 1] = NULL;
1789: }
1.545 ! djm 1790: listener_proctitle = prepare_proctitle(ac, av);
1.362 dtucker 1791:
1792: /* Ensure that umask disallows at least group and world write */
1793: new_umask = umask(0077) | 0022;
1794: (void) umask(new_umask);
1.294 djm 1795:
1.108 markus 1796: /* Initialize the log (it is reinitialized below in case we forked). */
1.306 dtucker 1797: if (debug_flag && (!inetd_flag || rexeced_flag))
1.64 markus 1798: log_stderr = 1;
1.138 markus 1799: log_init(__progname, options.log_level, options.log_facility, log_stderr);
1.64 markus 1800:
1.108 markus 1801: /*
1.478 dtucker 1802: * If not in debugging mode, not started from inetd and not already
1803: * daemonized (eg re-exec via SIGHUP), disconnect from the controlling
1804: * terminal, and fork. The original process exits.
1.108 markus 1805: */
1.478 dtucker 1806: already_daemon = daemonized();
1807: if (!(debug_flag || inetd_flag || no_daemon_flag || already_daemon)) {
1.345 djm 1808:
1.537 deraadt 1809: if (daemon(0, 0) == -1)
1.64 markus 1810: fatal("daemon() failed: %.200s", strerror(errno));
1811:
1.477 dtucker 1812: disconnect_controlling_tty();
1.64 markus 1813: }
1814: /* Reinitialize the log (because of the fork above). */
1.138 markus 1815: log_init(__progname, options.log_level, options.log_facility, log_stderr);
1.64 markus 1816:
1817: /* Chdir to the root directory so that the current disk can be
1818: unmounted if desired. */
1.401 dtucker 1819: if (chdir("/") == -1)
1820: error("chdir(\"/\"): %s", strerror(errno));
1.217 deraadt 1821:
1.178 markus 1822: /* ignore SIGPIPE */
1.544 dtucker 1823: ssh_signal(SIGPIPE, SIG_IGN);
1.64 markus 1824:
1.345 djm 1825: /* Get a connection, either from inetd or a listening TCP socket */
1.64 markus 1826: if (inetd_flag) {
1.345 djm 1827: server_accept_inetd(&sock_in, &sock_out);
1.64 markus 1828: } else {
1.345 djm 1829: server_listen();
1.75 markus 1830:
1.544 dtucker 1831: ssh_signal(SIGHUP, sighup_handler);
1832: ssh_signal(SIGCHLD, main_sigchld_handler);
1833: ssh_signal(SIGTERM, sigterm_handler);
1834: ssh_signal(SIGQUIT, sigterm_handler);
1.201 markus 1835:
1.345 djm 1836: /*
1837: * Write out the pid file after the sigterm handler
1838: * is setup and the listen sockets are bound
1839: */
1.479 dtucker 1840: if (options.pid_file != NULL && !debug_flag) {
1.345 djm 1841: FILE *f = fopen(options.pid_file, "w");
1.201 markus 1842:
1.270 djm 1843: if (f == NULL) {
1844: error("Couldn't create pid file \"%s\": %s",
1845: options.pid_file, strerror(errno));
1846: } else {
1.245 mpech 1847: fprintf(f, "%ld\n", (long) getpid());
1.64 markus 1848: fclose(f);
1849: }
1850: }
1851:
1.345 djm 1852: /* Accept a connection and return in a forked child */
1853: server_accept_loop(&sock_in, &sock_out,
1854: &newsock, config_s);
1.1 deraadt 1855: }
1856:
1.64 markus 1857: /* This is the child processing a new connection. */
1.288 markus 1858: setproctitle("%s", "[accepted]");
1.294 djm 1859:
1.300 markus 1860: /*
1861: * Create a new session and process group since the 4.4BSD
1862: * setlogin() affects the entire process group. We don't
1863: * want the child to be able to affect the parent.
1864: */
1.537 deraadt 1865: if (!debug_flag && !inetd_flag && setsid() == -1)
1.300 markus 1866: error("setsid: %.100s", strerror(errno));
1867:
1.294 djm 1868: if (rexec_flag) {
1869: int fd;
1870:
1.296 djm 1871: debug("rexec start in %d out %d newsock %d pipe %d sock %d",
1872: sock_in, sock_out, newsock, startup_pipe, config_s[0]);
1.294 djm 1873: dup2(newsock, STDIN_FILENO);
1874: dup2(STDIN_FILENO, STDOUT_FILENO);
1875: if (startup_pipe == -1)
1.296 djm 1876: close(REEXEC_STARTUP_PIPE_FD);
1.407 djm 1877: else if (startup_pipe != REEXEC_STARTUP_PIPE_FD) {
1.296 djm 1878: dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD);
1.407 djm 1879: close(startup_pipe);
1880: startup_pipe = REEXEC_STARTUP_PIPE_FD;
1881: }
1.294 djm 1882:
1.296 djm 1883: dup2(config_s[1], REEXEC_CONFIG_PASS_FD);
1.294 djm 1884: close(config_s[1]);
1.296 djm 1885:
1.294 djm 1886: execv(rexec_argv[0], rexec_argv);
1887:
1888: /* Reexec has failed, fall back and continue */
1889: error("rexec of %s failed: %s", rexec_argv[0], strerror(errno));
1.296 djm 1890: recv_rexec_state(REEXEC_CONFIG_PASS_FD, NULL);
1.294 djm 1891: log_init(__progname, options.log_level,
1892: options.log_facility, log_stderr);
1893:
1894: /* Clean up fds */
1.296 djm 1895: close(REEXEC_CONFIG_PASS_FD);
1896: newsock = sock_out = sock_in = dup(STDIN_FILENO);
1.294 djm 1897: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1898: dup2(fd, STDIN_FILENO);
1899: dup2(fd, STDOUT_FILENO);
1900: if (fd > STDERR_FILENO)
1901: close(fd);
1902: }
1.296 djm 1903: debug("rexec cleanup in %d out %d newsock %d pipe %d sock %d",
1904: sock_in, sock_out, newsock, startup_pipe, config_s[0]);
1.294 djm 1905: }
1.372 djm 1906:
1907: /* Executed child processes don't need these. */
1908: fcntl(sock_out, F_SETFD, FD_CLOEXEC);
1909: fcntl(sock_in, F_SETFD, FD_CLOEXEC);
1.64 markus 1910:
1.66 markus 1911: /*
1912: * Disable the key regeneration alarm. We will not regenerate the
1913: * key since we are no longer in a position to give it to anyone. We
1914: * will not restart on SIGHUP since it no longer makes sense.
1915: */
1.64 markus 1916: alarm(0);
1.544 dtucker 1917: ssh_signal(SIGALRM, SIG_DFL);
1918: ssh_signal(SIGHUP, SIG_DFL);
1919: ssh_signal(SIGTERM, SIG_DFL);
1920: ssh_signal(SIGQUIT, SIG_DFL);
1921: ssh_signal(SIGCHLD, SIG_DFL);
1.150 markus 1922:
1.66 markus 1923: /*
1924: * Register our connection. This turns encryption off because we do
1925: * not have a key.
1926: */
1.525 djm 1927: if ((ssh = ssh_packet_set_connection(NULL, sock_in, sock_out)) == NULL)
1928: fatal("Unable to create connection");
1.527 djm 1929: the_active_state = ssh;
1.525 djm 1930: ssh_packet_set_server(ssh);
1.492 djm 1931:
1.466 djm 1932: check_ip_options(ssh);
1.309 djm 1933:
1.492 djm 1934: /* Prepare the channels layer */
1935: channel_init_channels(ssh);
1936: channel_set_af(ssh, options.address_family);
1937: process_permitopen(ssh, &options);
1938:
1.309 djm 1939: /* Set SO_KEEPALIVE if requested. */
1.525 djm 1940: if (options.tcp_keep_alive && ssh_packet_connection_is_on_socket(ssh) &&
1.537 deraadt 1941: setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) == -1)
1.309 djm 1942: error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
1.1 deraadt 1943:
1.466 djm 1944: if ((remote_port = ssh_remote_port(ssh)) < 0) {
1945: debug("ssh_remote_port failed");
1.310 markus 1946: cleanup_exit(255);
1947: }
1.316 dtucker 1948:
1949: /*
1.331 markus 1950: * The rest of the code depends on the fact that
1.466 djm 1951: * ssh_remote_ipaddr() caches the remote ip, even if
1.331 markus 1952: * the socket goes away.
1953: */
1.466 djm 1954: remote_ip = ssh_remote_ipaddr(ssh);
1.209 markus 1955:
1.496 djm 1956: rdomain = ssh_packet_rdomain_in(ssh);
1957:
1.64 markus 1958: /* Log the connection. */
1.447 dtucker 1959: laddr = get_local_ipaddr(sock_in);
1.497 djm 1960: verbose("Connection from %s port %d on %s port %d%s%s%s",
1.496 djm 1961: remote_ip, remote_port, laddr, ssh_local_port(ssh),
1.497 djm 1962: rdomain == NULL ? "" : " rdomain \"",
1963: rdomain == NULL ? "" : rdomain,
1964: rdomain == NULL ? "" : "\"");
1.447 dtucker 1965: free(laddr);
1.1 deraadt 1966:
1.66 markus 1967: /*
1.317 djm 1968: * We don't want to listen forever unless the other side
1.66 markus 1969: * successfully authenticates itself. So we set up an alarm which is
1970: * cleared after successful authentication. A limit of zero
1.317 djm 1971: * indicates no limit. Note that we don't set the alarm in debugging
1.66 markus 1972: * mode; it is just annoying to have the server exit just when you
1973: * are about to discover the bug.
1974: */
1.544 dtucker 1975: ssh_signal(SIGALRM, grace_alarm_handler);
1.64 markus 1976: if (!debug_flag)
1977: alarm(options.login_grace_time);
1978:
1.520 djm 1979: if (kex_exchange_identification(ssh, -1, options.version_addendum) != 0)
1980: cleanup_exit(255); /* error already logged */
1981:
1.525 djm 1982: ssh_packet_set_nonblocking(ssh);
1.1 deraadt 1983:
1.278 markus 1984: /* allocate authentication context */
1.329 djm 1985: authctxt = xcalloc(1, sizeof(*authctxt));
1.525 djm 1986: ssh->authctxt = authctxt;
1.278 markus 1987:
1988: /* XXX global for cleanup, access from other modules */
1989: the_authctxt = authctxt;
1.506 djm 1990:
1991: /* Set default key authentication options */
1992: if ((auth_opts = sshauthopt_new_with_keys_defaults()) == NULL)
1993: fatal("allocation failed");
1.278 markus 1994:
1.307 otto 1995: /* prepare buffer to collect messages to display to user after login */
1.510 markus 1996: if ((loginmsg = sshbuf_new()) == NULL)
1997: fatal("%s: sshbuf_new failed", __func__);
1.374 dtucker 1998: auth_debug_reset();
1.307 otto 1999:
1.404 markus 2000: if (use_privsep) {
1.525 djm 2001: if (privsep_preauth(ssh) == 1)
1.237 markus 2002: goto authenticated;
1.472 markus 2003: } else if (have_agent) {
1.432 djm 2004: if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) {
2005: error("Unable to get agent socket: %s", ssh_err(r));
1.433 djm 2006: have_agent = 0;
1.432 djm 2007: }
2008: }
1.231 provos 2009:
1.77 markus 2010: /* perform the key exchange */
2011: /* authenticate user and start session */
1.525 djm 2012: do_ssh2_kex(ssh);
1.524 djm 2013: do_authentication2(ssh);
1.472 markus 2014:
1.237 markus 2015: /*
2016: * If we use privilege separation, the unprivileged child transfers
2017: * the current keystate and exits
2018: */
2019: if (use_privsep) {
1.527 djm 2020: mm_send_keystate(ssh, pmonitor);
1.525 djm 2021: ssh_packet_clear_keys(ssh);
1.231 provos 2022: exit(0);
1.237 markus 2023: }
1.231 provos 2024:
2025: authenticated:
1.318 djm 2026: /*
2027: * Cancel the alarm we set to limit the time taken for
2028: * authentication.
2029: */
2030: alarm(0);
1.544 dtucker 2031: ssh_signal(SIGALRM, SIG_DFL);
1.347 markus 2032: authctxt->authenticated = 1;
1.318 djm 2033: if (startup_pipe != -1) {
2034: close(startup_pipe);
2035: startup_pipe = -1;
2036: }
1.495 djm 2037:
2038: if (options.routing_domain != NULL)
2039: set_process_rdomain(ssh, options.routing_domain);
1.318 djm 2040:
1.234 markus 2041: /*
1.231 provos 2042: * In privilege separation, we fork another child and prepare
2043: * file descriptor passing.
2044: */
2045: if (use_privsep) {
1.525 djm 2046: privsep_postauth(ssh, authctxt);
1.237 markus 2047: /* the monitor process [priv] will not return */
1.231 provos 2048: }
1.360 dtucker 2049:
1.525 djm 2050: ssh_packet_set_timeout(ssh, options.client_alive_interval,
1.360 dtucker 2051: options.client_alive_count_max);
1.439 djm 2052:
2053: /* Try to send all our hostkeys to the client */
1.492 djm 2054: notify_hostkeys(ssh);
1.230 provos 2055:
1.278 markus 2056: /* Start session. */
1.492 djm 2057: do_authenticated(ssh, authctxt);
1.230 provos 2058:
1.64 markus 2059: /* The connection has been terminated. */
1.525 djm 2060: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.381 djm 2061: verbose("Transferred: sent %llu, received %llu bytes",
2062: (unsigned long long)obytes, (unsigned long long)ibytes);
1.364 markus 2063:
2064: verbose("Closing connection to %.500s port %d", remote_ip, remote_port);
1.525 djm 2065: ssh_packet_close(ssh);
1.231 provos 2066:
2067: if (use_privsep)
2068: mm_terminate();
2069:
1.64 markus 2070: exit(0);
1.1 deraadt 2071: }
1.98 markus 2072:
1.435 markus 2073: int
1.527 djm 2074: sshd_hostkey_sign(struct ssh *ssh, struct sshkey *privkey,
2075: struct sshkey *pubkey, u_char **signature, size_t *slenp,
2076: const u_char *data, size_t dlen, const char *alg)
1.404 markus 2077: {
1.432 djm 2078: int r;
2079:
1.527 djm 2080: if (use_privsep) {
2081: if (privkey) {
2082: if (mm_sshkey_sign(ssh, privkey, signature, slenp,
1.542 djm 2083: data, dlen, alg, options.sk_provider,
2084: ssh->compat) < 0)
1.527 djm 2085: fatal("%s: privkey sign failed", __func__);
2086: } else {
2087: if (mm_sshkey_sign(ssh, pubkey, signature, slenp,
1.542 djm 2088: data, dlen, alg, options.sk_provider,
2089: ssh->compat) < 0)
1.527 djm 2090: fatal("%s: pubkey sign failed", __func__);
2091: }
1.404 markus 2092: } else {
1.527 djm 2093: if (privkey) {
2094: if (sshkey_sign(privkey, signature, slenp, data, dlen,
1.542 djm 2095: alg, options.sk_provider, ssh->compat) < 0)
1.527 djm 2096: fatal("%s: privkey sign failed", __func__);
2097: } else {
2098: if ((r = ssh_agent_sign(auth_sock, pubkey,
2099: signature, slenp, data, dlen, alg,
2100: ssh->compat)) != 0) {
2101: fatal("%s: agent sign failed: %s",
2102: __func__, ssh_err(r));
2103: }
2104: }
1.404 markus 2105: }
1.435 markus 2106: return 0;
1.404 markus 2107: }
2108:
1.452 djm 2109: /* SSH2 key exchange */
1.200 itojun 2110: static void
1.525 djm 2111: do_ssh2_kex(struct ssh *ssh)
1.98 markus 2112: {
1.422 markus 2113: char *myproposal[PROPOSAL_MAX] = { KEX_SERVER };
1.435 markus 2114: struct kex *kex;
1.437 markus 2115: int r;
1.102 markus 2116:
1.457 djm 2117: myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(
1.514 djm 2118: options.kex_algorithms);
1.457 djm 2119: myproposal[PROPOSAL_ENC_ALGS_CTOS] = compat_cipher_proposal(
1.514 djm 2120: options.ciphers);
1.457 djm 2121: myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal(
1.514 djm 2122: options.ciphers);
1.457 djm 2123: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
2124: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
2125:
1.312 markus 2126: if (options.compression == COMP_NONE) {
1.246 markus 2127: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
1.470 dtucker 2128: myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
1.102 markus 2129: }
1.400 dtucker 2130:
2131: if (options.rekey_limit || options.rekey_interval)
1.525 djm 2132: ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
1.481 dtucker 2133: options.rekey_interval);
1.327 deraadt 2134:
1.413 djm 2135: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal(
1.514 djm 2136: list_hostkey_types());
1.134 markus 2137:
1.189 markus 2138: /* start key exchange */
1.525 djm 2139: if ((r = kex_setup(ssh, myproposal)) != 0)
1.437 markus 2140: fatal("kex_setup: %s", ssh_err(r));
1.525 djm 2141: kex = ssh->kex;
1.426 markus 2142: #ifdef WITH_OPENSSL
1.532 djm 2143: kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_server;
2144: kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_server;
2145: kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_server;
2146: kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_server;
2147: kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_server;
1.263 markus 2148: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1.324 djm 2149: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1.532 djm 2150: kex->kex[KEX_ECDH_SHA2] = kex_gen_server;
1.426 markus 2151: #endif
1.532 djm 2152: kex->kex[KEX_C25519_SHA256] = kex_gen_server;
2153: kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_server;
1.373 djm 2154: kex->load_host_public_key=&get_hostkey_public_by_type;
2155: kex->load_host_private_key=&get_hostkey_private_by_type;
1.231 provos 2156: kex->host_key_index=&get_hostkey_index;
1.404 markus 2157: kex->sign = sshd_hostkey_sign;
1.189 markus 2158:
1.525 djm 2159: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &kex->done);
1.187 markus 2160:
2161: session_id2 = kex->session_id;
2162: session_id2_len = kex->session_id_len;
1.129 provos 2163:
2164: #ifdef DEBUG_KEXDH
2165: /* send 1st encrypted/maced/compressed message */
2166: packet_start(SSH2_MSG_IGNORE);
2167: packet_put_cstring("markus");
2168: packet_send();
2169: packet_write_wait();
2170: #endif
1.186 markus 2171: debug("KEX done");
1.278 markus 2172: }
2173:
2174: /* server specific fatal cleanup */
2175: void
2176: cleanup_exit(int i)
2177: {
1.527 djm 2178: if (the_active_state != NULL && the_authctxt != NULL) {
2179: do_cleanup(the_active_state, the_authctxt);
1.423 djm 2180: if (use_privsep && privsep_is_preauth &&
2181: pmonitor != NULL && pmonitor->m_pid > 1) {
1.386 djm 2182: debug("Killing privsep child %d", pmonitor->m_pid);
2183: if (kill(pmonitor->m_pid, SIGKILL) != 0 &&
1.388 djm 2184: errno != ESRCH)
1.386 djm 2185: error("%s: kill(%d): %s", __func__,
2186: pmonitor->m_pid, strerror(errno));
2187: }
2188: }
1.278 markus 2189: _exit(i);
1.1 deraadt 2190: }
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