Annotation of src/crypto/external/bsd/openssh/dist/sshd.c, Revision 1.1.1.25
1.1.1.25! christos 1: /* $OpenBSD: sshd.c,v 1.552 2020/03/13 04:01:57 djm Exp $ */
1.1 christos 2: /*
3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * This program is the ssh daemon. It listens for connections from clients,
7: * and performs authentication, executes use commands or shell, and forwards
8: * information to/from the application to the user client over an encrypted
9: * connection. This can also handle forwarding of X11, TCP/IP, and
10: * authentication agent connections.
11: *
12: * As far as I am concerned, the code I have written for this software
13: * can be used freely for any purpose. Any derived versions of this
14: * software must be clearly marked as such, and if the derived work is
15: * incompatible with the protocol description in the RFC file, it must be
16: * called by a name other than "ssh" or "Secure Shell".
17: *
18: * SSH2 implementation:
19: * Privilege Separation:
20: *
21: * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved.
22: * Copyright (c) 2002 Niels Provos. All rights reserved.
23: *
24: * Redistribution and use in source and binary forms, with or without
25: * modification, are permitted provided that the following conditions
26: * are met:
27: * 1. Redistributions of source code must retain the above copyright
28: * notice, this list of conditions and the following disclaimer.
29: * 2. Redistributions in binary form must reproduce the above copyright
30: * notice, this list of conditions and the following disclaimer in the
31: * documentation and/or other materials provided with the distribution.
32: *
33: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
34: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
35: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
36: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
37: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
38: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
39: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
40: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
41: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
42: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43: */
44:
45: #include <sys/types.h>
46: #include <sys/ioctl.h>
47: #include <sys/wait.h>
48: #include <sys/tree.h>
49: #include <sys/stat.h>
50: #include <sys/socket.h>
51: #include <sys/time.h>
52: #include <sys/queue.h>
53:
54: #include <errno.h>
55: #include <fcntl.h>
56: #include <netdb.h>
57: #include <paths.h>
58: #include <pwd.h>
59: #include <signal.h>
60: #include <stdio.h>
61: #include <stdlib.h>
62: #include <string.h>
1.1.1.24 christos 63: #include <stdarg.h>
1.1 christos 64: #include <unistd.h>
1.1.1.11 christos 65: #include <limits.h>
1.1 christos 66:
1.1.1.10 christos 67: #ifdef WITH_OPENSSL
1.1 christos 68: #include <openssl/bn.h>
1.1.1.10 christos 69: #endif
1.1 christos 70:
71: #include "xmalloc.h"
72: #include "ssh.h"
73: #include "ssh2.h"
74: #include "sshpty.h"
75: #include "packet.h"
76: #include "log.h"
1.1.1.21 christos 77: #include "sshbuf.h"
1.1.1.10 christos 78: #include "misc.h"
1.1.1.13 christos 79: #include "match.h"
1.1 christos 80: #include "servconf.h"
81: #include "uidswap.h"
82: #include "compat.h"
83: #include "cipher.h"
1.1.1.10 christos 84: #include "digest.h"
1.1.1.21 christos 85: #include "sshkey.h"
1.1 christos 86: #include "kex.h"
87: #include "myproposal.h"
88: #include "authfile.h"
89: #include "pathnames.h"
90: #include "atomicio.h"
91: #include "canohost.h"
92: #include "hostfile.h"
93: #include "auth.h"
1.1.1.9 christos 94: #include "authfd.h"
1.1 christos 95: #include "msg.h"
96: #include "dispatch.h"
97: #include "channels.h"
98: #include "session.h"
99: #include "monitor.h"
100: #ifdef GSSAPI
101: #include "ssh-gss.h"
102: #endif
103: #include "monitor_wrap.h"
1.1.1.5 christos 104: #include "ssh-sandbox.h"
1.1.1.20 christos 105: #include "auth-options.h"
1.1 christos 106: #include "version.h"
1.1.1.11 christos 107: #include "ssherr.h"
1.1.1.24 christos 108: #include "sk-api.h"
1.1 christos 109:
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:
116: extern char *__progname;
117:
118: /* Server configuration options. */
119: ServerOptions options;
120:
121: /* Name of the server configuration file. */
122: char *config_file_name = _PATH_SERVER_CONFIG_FILE;
123:
124: /*
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: */
130: int debug_flag = 0;
131:
1.1.1.20 christos 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: */
1.1.1.22 christos 138: static int test_flag = 0;
1.1 christos 139:
140: /* Flag indicating that the daemon is being started from inetd. */
1.1.1.22 christos 141: static int inetd_flag = 0;
1.1 christos 142:
143: /* Flag indicating that sshd should not detach and become a daemon. */
1.1.1.22 christos 144: static int no_daemon_flag = 0;
1.1 christos 145:
146: /* debug goes to stderr unless inetd_flag is set */
1.1.1.22 christos 147: static int log_stderr = 0;
1.1 christos 148:
149: /* Saved arguments to main(). */
1.1.1.22 christos 150: static char **saved_argv;
1.1 christos 151:
152: /* re-exec */
1.1.1.22 christos 153: static int rexeced_flag = 0;
154: static int rexec_flag = 1;
155: static int rexec_argc = 0;
156: static char **rexec_argv;
1.1 christos 157:
158: /*
159: * The sockets that the server is listening; this is used in the SIGHUP
160: * signal handler.
161: */
162: #define MAX_LISTEN_SOCKS 16
1.1.1.22 christos 163: static int listen_socks[MAX_LISTEN_SOCKS];
164: static int num_listen_socks = 0;
1.1 christos 165:
1.1.1.9 christos 166: /* Daemon's agent connection */
1.1.1.11 christos 167: int auth_sock = -1;
1.1.1.22 christos 168: static int have_agent = 0;
1.1.1.9 christos 169:
1.1 christos 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: */
178: struct {
1.1.1.19 christos 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 christos 183: } sensitive_data;
184:
185: /* This is set to true when a signal is received. */
186: static volatile sig_atomic_t received_sighup = 0;
187: static volatile sig_atomic_t received_sigterm = 0;
188:
189: /* session identifier, used by RSA-auth */
190: u_char session_id[16];
191:
192: /* same for ssh2 */
193: u_char *session_id2 = NULL;
194: u_int session_id2_len = 0;
195:
196: /* record remote hostname or ip */
1.1.1.11 christos 197: u_int utmp_len = HOST_NAME_MAX+1;
1.1 christos 198:
1.1.1.22 christos 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: */
216: static int *startup_pipes = NULL;
217: static int *startup_flags = NULL; /* Indicates child closed listener */
218: static int startup_pipe = -1; /* in child */
1.1 christos 219:
220: /* variables used for privilege separation */
221: int use_privsep = -1;
222: struct monitor *pmonitor = NULL;
1.1.1.6 christos 223: int privsep_is_preauth = 1;
1.1 christos 224:
1.1.1.22 christos 225: /* global connection state and authentication contexts */
1.1 christos 226: Authctxt *the_authctxt = NULL;
1.1.1.22 christos 227: struct ssh *the_active_state;
1.1 christos 228:
1.1.1.20 christos 229: /* global key/cert auth options. XXX move to permanent ssh->authctxt? */
230: struct sshauthopt *auth_opts = NULL;
231:
1.1 christos 232: /* sshd_config buffer */
1.1.1.21 christos 233: struct sshbuf *cfg;
1.1 christos 234:
1.1.1.24 christos 235: /* Included files from the configuration file */
236: struct include_list includes = TAILQ_HEAD_INITIALIZER(includes);
237:
1.1 christos 238: /* message to be displayed after login */
1.1.1.21 christos 239: struct sshbuf *loginmsg;
1.1 christos 240:
241: /* Prototypes for various functions defined later in this file. */
242: void destroy_sensitive_data(void);
243: void demote_sensitive_data(void);
1.1.1.22 christos 244: static void do_ssh2_kex(struct ssh *);
1.1 christos 245:
1.1.1.24 christos 246: static char *listener_proctitle;
247:
1.1 christos 248: /*
249: * Close all listening sockets
250: */
251: static void
252: close_listen_socks(void)
253: {
254: int i;
255:
256: for (i = 0; i < num_listen_socks; i++)
257: close(listen_socks[i]);
258: num_listen_socks = -1;
259: }
260:
261: static void
262: close_startup_pipes(void)
263: {
264: int i;
265:
266: if (startup_pipes)
267: for (i = 0; i < options.max_startups; i++)
268: if (startup_pipes[i] != -1)
269: close(startup_pipes[i]);
270: }
271:
272: /*
273: * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP;
274: * the effect is to reread the configuration file (and to regenerate
275: * the server key).
276: */
277:
278: /*ARGSUSED*/
279: static void
280: sighup_handler(int sig)
281: {
282: received_sighup = 1;
283: }
284:
285: /*
286: * Called from the main program after receiving SIGHUP.
287: * Restarts the server.
288: */
289: static void
290: sighup_restart(void)
291: {
292: logit("Received SIGHUP; restarting.");
1.1.1.17 christos 293: if (options.pid_file != NULL)
294: unlink(options.pid_file);
1.1 christos 295: close_listen_socks();
296: close_startup_pipes();
1.1.1.24 christos 297: ssh_signal(SIGHUP, SIG_IGN); /* will be restored after exec */
1.1 christos 298: execv(saved_argv[0], saved_argv);
299: logit("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0],
300: strerror(errno));
301: exit(1);
302: }
303:
304: /*
305: * Generic signal handler for terminating signals in the master daemon.
306: */
307: /*ARGSUSED*/
308: static void
309: sigterm_handler(int sig)
310: {
311: received_sigterm = sig;
312: }
313:
314: /*
315: * SIGCHLD handler. This is called whenever a child dies. This will then
316: * reap any zombies left by exited children.
317: */
318: /*ARGSUSED*/
319: static void
320: main_sigchld_handler(int sig)
321: {
322: int save_errno = errno;
323: pid_t pid;
324: int status;
325:
1.1.1.24 christos 326: debug("main_sigchld_handler: %s", strsignal(sig));
327:
1.1 christos 328: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.1.1.23 christos 329: (pid == -1 && errno == EINTR))
1.1 christos 330: ;
331: errno = save_errno;
332: }
333:
334: /*
335: * Signal handler for the alarm after the login grace period has expired.
336: */
337: /*ARGSUSED*/
338: static void
339: grace_alarm_handler(int sig)
340: {
341: if (use_privsep && pmonitor != NULL && pmonitor->m_pid > 0)
342: kill(pmonitor->m_pid, SIGALRM);
343:
1.1.1.8 christos 344: /*
345: * Try to kill any processes that we have spawned, E.g. authorized
346: * keys command helpers.
347: */
348: if (getpgid(0) == getpid()) {
1.1.1.24 christos 349: ssh_signal(SIGTERM, SIG_IGN);
1.1.1.10 christos 350: kill(0, SIGTERM);
1.1.1.8 christos 351: }
352:
1.1.1.22 christos 353: /* XXX pre-format ipaddr/port so we don't need to access active_state */
1.1 christos 354: /* Log error and exit. */
1.1.1.16 christos 355: sigdie("Timeout before authentication for %s port %d",
1.1.1.22 christos 356: ssh_remote_ipaddr(the_active_state),
357: ssh_remote_port(the_active_state));
1.1 christos 358: }
359:
360: /* Destroy the host and server keys. They will no longer be needed. */
361: void
362: destroy_sensitive_data(void)
363: {
1.1.1.20 christos 364: u_int i;
1.1 christos 365:
366: for (i = 0; i < options.num_host_key_files; i++) {
367: if (sensitive_data.host_keys[i]) {
1.1.1.21 christos 368: sshkey_free(sensitive_data.host_keys[i]);
1.1 christos 369: sensitive_data.host_keys[i] = NULL;
370: }
1.1.1.3 adam 371: if (sensitive_data.host_certificates[i]) {
1.1.1.21 christos 372: sshkey_free(sensitive_data.host_certificates[i]);
1.1.1.3 adam 373: sensitive_data.host_certificates[i] = NULL;
374: }
1.1 christos 375: }
376: }
377:
378: /* Demote private to public keys for network child */
379: void
380: demote_sensitive_data(void)
381: {
1.1.1.19 christos 382: struct sshkey *tmp;
1.1.1.20 christos 383: u_int i;
1.1.1.21 christos 384: int r;
1.1 christos 385:
386: for (i = 0; i < options.num_host_key_files; i++) {
387: if (sensitive_data.host_keys[i]) {
1.1.1.22 christos 388: if ((r = sshkey_from_private(
389: sensitive_data.host_keys[i], &tmp)) != 0)
1.1.1.21 christos 390: fatal("could not demote host %s key: %s",
391: sshkey_type(sensitive_data.host_keys[i]),
392: ssh_err(r));
393: sshkey_free(sensitive_data.host_keys[i]);
1.1 christos 394: sensitive_data.host_keys[i] = tmp;
395: }
1.1.1.3 adam 396: /* Certs do not need demotion */
1.1 christos 397: }
398: }
399:
400: static void
401: privsep_preauth_child(void)
402: {
403: gid_t gidset[1];
404: struct passwd *pw;
405:
406: /* Enable challenge-response authentication for privilege separation */
407: privsep_challenge_enable();
408:
1.1.1.10 christos 409: #ifdef GSSAPI
410: /* Cache supported mechanism OIDs for later use */
1.1.1.22 christos 411: ssh_gssapi_prepare_supported_oids();
1.1.1.10 christos 412: #endif
1.1 christos 413:
414: /* Demote the private keys to public keys. */
415: demote_sensitive_data();
416:
1.1.1.15 christos 417: /* Demote the child */
418: if (getuid() == 0 || geteuid() == 0) {
419: if ((pw = getpwnam(SSH_PRIVSEP_USER)) == NULL)
420: fatal("Privilege separation user %s does not exist",
421: SSH_PRIVSEP_USER);
1.1.1.20 christos 422: pw = pwcopy(pw); /* Ensure mutable */
1.1.1.15 christos 423: endpwent();
1.1.1.20 christos 424: freezero(pw->pw_passwd, strlen(pw->pw_passwd));
1.1 christos 425:
1.1.1.15 christos 426: /* Change our root directory */
427: if (chroot(_PATH_PRIVSEP_CHROOT_DIR) == -1)
428: fatal("chroot(\"%s\"): %s", _PATH_PRIVSEP_CHROOT_DIR,
429: strerror(errno));
430: if (chdir("/") == -1)
431: fatal("chdir(\"/\"): %s", strerror(errno));
432:
433: /*
434: * Drop our privileges
435: * NB. Can't use setusercontext() after chroot.
436: */
437: debug3("privsep user:group %u:%u", (u_int)pw->pw_uid,
438: (u_int)pw->pw_gid);
439: gidset[0] = pw->pw_gid;
1.1.1.23 christos 440: if (setgroups(1, gidset) == -1)
1.1.1.15 christos 441: fatal("setgroups: %.100s", strerror(errno));
442: permanently_set_uid(pw);
443: }
1.1 christos 444: }
445:
446: static int
1.1.1.22 christos 447: privsep_preauth(struct ssh *ssh)
1.1 christos 448: {
1.1.1.11 christos 449: int status, r;
1.1 christos 450: pid_t pid;
1.1.1.5 christos 451: struct ssh_sandbox *box = NULL;
1.1 christos 452:
453: /* Set up unprivileged child process to deal with network data */
454: pmonitor = monitor_init();
455: /* Store a pointer to the kex for later rekeying */
1.1.1.22 christos 456: pmonitor->m_pkex = &ssh->kex;
1.1 christos 457:
1.1.1.7 christos 458: if (use_privsep == PRIVSEP_ON)
1.1.1.5 christos 459: box = ssh_sandbox_init();
1.1 christos 460: pid = fork();
461: if (pid == -1) {
462: fatal("fork of unprivileged child failed");
463: } else if (pid != 0) {
464: debug2("Network child is on pid %ld", (long)pid);
465:
1.1.1.7 christos 466: pmonitor->m_pid = pid;
1.1.1.11 christos 467: if (have_agent) {
468: r = ssh_get_authentication_socket(&auth_sock);
469: if (r != 0) {
470: error("Could not get agent socket: %s",
471: ssh_err(r));
472: have_agent = 0;
473: }
474: }
1.1.1.5 christos 475: if (box != NULL)
476: ssh_sandbox_parent_preauth(box, pid);
1.1.1.22 christos 477: monitor_child_preauth(ssh, pmonitor);
1.1 christos 478:
479: /* Wait for the child's exit status */
1.1.1.23 christos 480: while (waitpid(pid, &status, 0) == -1) {
1.1.1.6 christos 481: if (errno == EINTR)
482: continue;
483: pmonitor->m_pid = -1;
484: fatal("%s: waitpid: %s", __func__, strerror(errno));
1.1.1.5 christos 485: }
1.1.1.6 christos 486: privsep_is_preauth = 0;
487: pmonitor->m_pid = -1;
1.1.1.5 christos 488: if (WIFEXITED(status)) {
489: if (WEXITSTATUS(status) != 0)
490: fatal("%s: preauth child exited with status %d",
491: __func__, WEXITSTATUS(status));
492: } else if (WIFSIGNALED(status))
493: fatal("%s: preauth child terminated by signal %d",
494: __func__, WTERMSIG(status));
495: if (box != NULL)
496: ssh_sandbox_parent_finish(box);
497: return 1;
1.1 christos 498: } else {
499: /* child */
500: close(pmonitor->m_sendfd);
1.1.1.5 christos 501: close(pmonitor->m_log_recvfd);
502:
503: /* Arrange for logging to be sent to the monitor */
504: set_log_handler(mm_log_handler, pmonitor);
1.1 christos 505:
1.1.1.15 christos 506: privsep_preauth_child();
1.1 christos 507: setproctitle("%s", "[net]");
1.1.1.5 christos 508: if (box != NULL)
509: ssh_sandbox_child(box);
510:
511: return 0;
1.1 christos 512: }
513: }
514:
515: static void
1.1.1.22 christos 516: privsep_postauth(struct ssh *ssh, Authctxt *authctxt)
1.1 christos 517: {
1.1.1.17 christos 518: if (authctxt->pw->pw_uid == 0) {
1.1 christos 519: /* File descriptor passing is broken or root login */
520: use_privsep = 0;
521: goto skip;
522: }
523:
524: /* New socket pair */
525: monitor_reinit(pmonitor);
526:
527: pmonitor->m_pid = fork();
528: if (pmonitor->m_pid == -1)
529: fatal("fork of unprivileged child failed");
530: else if (pmonitor->m_pid != 0) {
531: verbose("User child is on pid %ld", (long)pmonitor->m_pid);
1.1.1.21 christos 532: sshbuf_reset(loginmsg);
1.1.1.22 christos 533: monitor_clear_keystate(ssh, pmonitor);
534: monitor_child_postauth(ssh, pmonitor);
1.1 christos 535:
536: /* NEVERREACHED */
537: exit(0);
538: }
539:
1.1.1.5 christos 540: /* child */
541:
1.1 christos 542: close(pmonitor->m_sendfd);
1.1.1.5 christos 543: pmonitor->m_sendfd = -1;
1.1 christos 544:
545: /* Demote the private keys to public keys. */
546: demote_sensitive_data();
547:
548: /* Drop privileges */
549: do_setusercontext(authctxt->pw);
550:
551: skip:
552: /* It is safe now to apply the key state */
1.1.1.22 christos 553: monitor_apply_keystate(ssh, pmonitor);
1.1 christos 554:
555: /*
556: * Tell the packet layer that authentication was successful, since
557: * this information is not part of the key state.
558: */
1.1.1.22 christos 559: ssh_packet_set_authenticated(ssh);
1.1 christos 560: }
561:
1.1.1.21 christos 562: static void
563: append_hostkey_type(struct sshbuf *b, const char *s)
564: {
565: int r;
566:
567: if (match_pattern_list(s, options.hostkeyalgorithms, 0) != 1) {
568: debug3("%s: %s key not permitted by HostkeyAlgorithms",
569: __func__, s);
570: return;
571: }
572: if ((r = sshbuf_putf(b, "%s%s", sshbuf_len(b) > 0 ? "," : "", s)) != 0)
573: fatal("%s: sshbuf_putf: %s", __func__, ssh_err(r));
574: }
575:
1.1 christos 576: static char *
577: list_hostkey_types(void)
578: {
1.1.1.21 christos 579: struct sshbuf *b;
580: struct sshkey *key;
1.1 christos 581: char *ret;
1.1.1.20 christos 582: u_int i;
1.1 christos 583:
1.1.1.21 christos 584: if ((b = sshbuf_new()) == NULL)
585: fatal("%s: sshbuf_new failed", __func__);
1.1 christos 586: for (i = 0; i < options.num_host_key_files; i++) {
1.1.1.3 adam 587: key = sensitive_data.host_keys[i];
1.1 christos 588: if (key == NULL)
1.1.1.9 christos 589: key = sensitive_data.host_pubkeys[i];
1.1.1.17 christos 590: if (key == NULL)
1.1.1.13 christos 591: continue;
1.1 christos 592: switch (key->type) {
593: case KEY_RSA:
1.1.1.21 christos 594: /* for RSA we also support SHA2 signatures */
595: append_hostkey_type(b, "rsa-sha2-512");
596: append_hostkey_type(b, "rsa-sha2-256");
597: /* FALLTHROUGH */
1.1 christos 598: case KEY_DSA:
1.1.1.4 christos 599: case KEY_ECDSA:
1.1.1.10 christos 600: case KEY_ED25519:
1.1.1.24 christos 601: case KEY_ECDSA_SK:
602: case KEY_ED25519_SK:
1.1.1.20 christos 603: case KEY_XMSS:
1.1.1.21 christos 604: append_hostkey_type(b, sshkey_ssh_name(key));
1.1 christos 605: break;
606: }
1.1.1.3 adam 607: /* If the private key has a cert peer, then list that too */
608: key = sensitive_data.host_certificates[i];
609: if (key == NULL)
610: continue;
611: switch (key->type) {
612: case KEY_RSA_CERT:
1.1.1.21 christos 613: /* for RSA we also support SHA2 signatures */
614: append_hostkey_type(b,
615: "rsa-sha2-512-cert-v01@openssh.com");
616: append_hostkey_type(b,
617: "rsa-sha2-256-cert-v01@openssh.com");
618: /* FALLTHROUGH */
1.1.1.3 adam 619: case KEY_DSA_CERT:
1.1.1.4 christos 620: case KEY_ECDSA_CERT:
1.1.1.10 christos 621: case KEY_ED25519_CERT:
1.1.1.24 christos 622: case KEY_ECDSA_SK_CERT:
623: case KEY_ED25519_SK_CERT:
1.1.1.20 christos 624: case KEY_XMSS_CERT:
1.1.1.21 christos 625: append_hostkey_type(b, sshkey_ssh_name(key));
1.1.1.3 adam 626: break;
627: }
1.1 christos 628: }
1.1.1.21 christos 629: if ((ret = sshbuf_dup_string(b)) == NULL)
1.1.1.16 christos 630: fatal("%s: sshbuf_dup_string failed", __func__);
1.1.1.21 christos 631: sshbuf_free(b);
632: debug("%s: %s", __func__, ret);
1.1 christos 633: return ret;
634: }
635:
1.1.1.19 christos 636: static struct sshkey *
1.1.1.11 christos 637: get_hostkey_by_type(int type, int nid, int need_private, struct ssh *ssh)
1.1 christos 638: {
1.1.1.20 christos 639: u_int i;
1.1.1.19 christos 640: struct sshkey *key;
1.1 christos 641:
642: for (i = 0; i < options.num_host_key_files; i++) {
1.1.1.3 adam 643: switch (type) {
644: case KEY_RSA_CERT:
645: case KEY_DSA_CERT:
1.1.1.4 christos 646: case KEY_ECDSA_CERT:
1.1.1.10 christos 647: case KEY_ED25519_CERT:
1.1.1.24 christos 648: case KEY_ECDSA_SK_CERT:
649: case KEY_ED25519_SK_CERT:
1.1.1.20 christos 650: case KEY_XMSS_CERT:
1.1.1.3 adam 651: key = sensitive_data.host_certificates[i];
652: break;
653: default:
654: key = sensitive_data.host_keys[i];
1.1.1.9 christos 655: if (key == NULL && !need_private)
656: key = sensitive_data.host_pubkeys[i];
1.1.1.3 adam 657: break;
658: }
1.1.1.24 christos 659: if (key == NULL || key->type != type)
660: continue;
661: switch (type) {
662: case KEY_ECDSA:
663: case KEY_ECDSA_SK:
664: case KEY_ECDSA_CERT:
665: case KEY_ECDSA_SK_CERT:
666: if (key->ecdsa_nid != nid)
667: continue;
668: /* FALLTHROUGH */
669: default:
1.1.1.3 adam 670: return need_private ?
671: sensitive_data.host_keys[i] : key;
1.1.1.24 christos 672: }
1.1 christos 673: }
674: return NULL;
675: }
676:
1.1.1.19 christos 677: struct sshkey *
1.1.1.11 christos 678: get_hostkey_public_by_type(int type, int nid, struct ssh *ssh)
1.1.1.3 adam 679: {
1.1.1.11 christos 680: return get_hostkey_by_type(type, nid, 0, ssh);
1.1.1.3 adam 681: }
682:
1.1.1.19 christos 683: struct sshkey *
1.1.1.11 christos 684: get_hostkey_private_by_type(int type, int nid, struct ssh *ssh)
1.1.1.3 adam 685: {
1.1.1.11 christos 686: return get_hostkey_by_type(type, nid, 1, ssh);
1.1.1.3 adam 687: }
688:
1.1.1.19 christos 689: struct sshkey *
1.1 christos 690: get_hostkey_by_index(int ind)
691: {
1.1.1.20 christos 692: if (ind < 0 || (u_int)ind >= options.num_host_key_files)
1.1 christos 693: return (NULL);
694: return (sensitive_data.host_keys[ind]);
695: }
696:
1.1.1.19 christos 697: struct sshkey *
1.1.1.11 christos 698: get_hostkey_public_by_index(int ind, struct ssh *ssh)
1.1.1.9 christos 699: {
1.1.1.20 christos 700: if (ind < 0 || (u_int)ind >= options.num_host_key_files)
1.1.1.9 christos 701: return (NULL);
702: return (sensitive_data.host_pubkeys[ind]);
703: }
704:
1.1 christos 705: int
1.1.1.19 christos 706: get_hostkey_index(struct sshkey *key, int compare, struct ssh *ssh)
1.1 christos 707: {
1.1.1.20 christos 708: u_int i;
1.1 christos 709:
710: for (i = 0; i < options.num_host_key_files; i++) {
1.1.1.21 christos 711: if (sshkey_is_cert(key)) {
1.1.1.11 christos 712: if (key == sensitive_data.host_certificates[i] ||
713: (compare && sensitive_data.host_certificates[i] &&
714: sshkey_equal(key,
715: sensitive_data.host_certificates[i])))
1.1.1.3 adam 716: return (i);
717: } else {
1.1.1.11 christos 718: if (key == sensitive_data.host_keys[i] ||
719: (compare && sensitive_data.host_keys[i] &&
720: sshkey_equal(key, sensitive_data.host_keys[i])))
1.1.1.3 adam 721: return (i);
1.1.1.11 christos 722: if (key == sensitive_data.host_pubkeys[i] ||
723: (compare && sensitive_data.host_pubkeys[i] &&
724: sshkey_equal(key, sensitive_data.host_pubkeys[i])))
1.1.1.9 christos 725: return (i);
1.1.1.3 adam 726: }
1.1 christos 727: }
728: return (-1);
729: }
730:
1.1.1.11 christos 731: /* Inform the client of all hostkeys */
732: static void
733: notify_hostkeys(struct ssh *ssh)
734: {
735: struct sshbuf *buf;
736: struct sshkey *key;
1.1.1.20 christos 737: u_int i, nkeys;
738: int r;
1.1.1.11 christos 739: char *fp;
740:
1.1.1.12 christos 741: /* Some clients cannot cope with the hostkeys message, skip those. */
1.1.1.22 christos 742: if (ssh->compat & SSH_BUG_HOSTKEYS)
1.1.1.12 christos 743: return;
744:
1.1.1.11 christos 745: if ((buf = sshbuf_new()) == NULL)
746: fatal("%s: sshbuf_new", __func__);
747: for (i = nkeys = 0; i < options.num_host_key_files; i++) {
748: key = get_hostkey_public_by_index(i, ssh);
749: if (key == NULL || key->type == KEY_UNSPEC ||
1.1.1.17 christos 750: sshkey_is_cert(key))
1.1.1.11 christos 751: continue;
752: fp = sshkey_fingerprint(key, options.fingerprint_hash,
753: SSH_FP_DEFAULT);
754: debug3("%s: key %d: %s %s", __func__, i,
755: sshkey_ssh_name(key), fp);
756: free(fp);
757: if (nkeys == 0) {
1.1.1.22 christos 758: /*
759: * Start building the request when we find the
760: * first usable key.
761: */
762: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
763: (r = sshpkt_put_cstring(ssh, "hostkeys-00@openssh.com")) != 0 ||
764: (r = sshpkt_put_u8(ssh, 0)) != 0) /* want reply */
765: sshpkt_fatal(ssh, r, "%s: start request", __func__);
1.1.1.11 christos 766: }
1.1.1.22 christos 767: /* Append the key to the request */
1.1.1.11 christos 768: sshbuf_reset(buf);
769: if ((r = sshkey_putb(key, buf)) != 0)
770: fatal("%s: couldn't put hostkey %d: %s",
771: __func__, i, ssh_err(r));
1.1.1.22 christos 772: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
773: sshpkt_fatal(ssh, r, "%s: append key", __func__);
1.1.1.11 christos 774: nkeys++;
775: }
1.1.1.20 christos 776: debug3("%s: sent %u hostkeys", __func__, nkeys);
1.1.1.11 christos 777: if (nkeys == 0)
778: fatal("%s: no hostkeys", __func__);
1.1.1.22 christos 779: if ((r = sshpkt_send(ssh)) != 0)
780: sshpkt_fatal(ssh, r, "%s: send", __func__);
1.1.1.11 christos 781: sshbuf_free(buf);
782: }
783:
1.1 christos 784: /*
785: * returns 1 if connection should be dropped, 0 otherwise.
786: * dropping starts at connection #max_startups_begin with a probability
787: * of (max_startups_rate/100). the probability increases linearly until
788: * all connections are dropped for startups > max_startups
789: */
790: static int
791: drop_connection(int startups)
792: {
793: int p, r;
794:
795: if (startups < options.max_startups_begin)
796: return 0;
797: if (startups >= options.max_startups)
798: return 1;
799: if (options.max_startups_rate == 100)
800: return 1;
801:
802: p = 100 - options.max_startups_rate;
803: p *= startups - options.max_startups_begin;
804: p /= options.max_startups - options.max_startups_begin;
805: p += options.max_startups_rate;
806: r = arc4random_uniform(100);
807:
808: debug("drop_connection: p %d, r %d", p, r);
809: return (r < p) ? 1 : 0;
810: }
811:
812: static void
813: usage(void)
814: {
815: fprintf(stderr, "%s, %s\n",
1.1.1.10 christos 816: SSH_VERSION,
817: #ifdef WITH_OPENSSL
1.1.1.22 christos 818: OpenSSL_version(OPENSSL_VERSION)
1.1.1.10 christos 819: #else
820: "without OpenSSL"
821: #endif
822: );
1.1 christos 823: fprintf(stderr,
1.1.1.17 christos 824: "usage: sshd [-46DdeiqTt] [-C connection_spec] [-c host_cert_file]\n"
1.1.1.9 christos 825: " [-E log_file] [-f config_file] [-g login_grace_time]\n"
1.1.1.17 christos 826: " [-h host_key_file] [-o option] [-p port] [-u len]\n"
1.1 christos 827: );
828: exit(1);
829: }
830:
831: static void
1.1.1.16 christos 832: send_rexec_state(int fd, struct sshbuf *conf)
1.1 christos 833: {
1.1.1.24 christos 834: struct sshbuf *m = NULL, *inc = NULL;
835: struct include_item *item = NULL;
1.1.1.16 christos 836: int r;
1.1 christos 837:
1.1.1.16 christos 838: debug3("%s: entering fd = %d config len %zu", __func__, fd,
839: sshbuf_len(conf));
1.1 christos 840:
1.1.1.24 christos 841: if ((m = sshbuf_new()) == NULL || (inc = sshbuf_new()) == NULL)
842: fatal("%s: sshbuf_new failed", __func__);
843:
844: /* pack includes into a string */
845: TAILQ_FOREACH(item, &includes, entry) {
846: if ((r = sshbuf_put_cstring(inc, item->selector)) != 0 ||
847: (r = sshbuf_put_cstring(inc, item->filename)) != 0 ||
848: (r = sshbuf_put_stringb(inc, item->contents)) != 0)
849: fatal("%s: buffer error: %s", __func__, ssh_err(r));
850: }
851:
1.1 christos 852: /*
853: * Protocol from reexec master to child:
854: * string configuration
1.1.1.24 christos 855: * string included_files[] {
856: * string selector
857: * string filename
858: * string contents
859: * }
1.1 christos 860: */
1.1.1.24 christos 861: if ((r = sshbuf_put_stringb(m, conf)) != 0 ||
862: (r = sshbuf_put_stringb(m, inc)) != 0)
1.1.1.16 christos 863: fatal("%s: buffer error: %s", __func__, ssh_err(r));
864: if (ssh_msg_send(fd, 0, m) == -1)
1.1 christos 865: fatal("%s: ssh_msg_send failed", __func__);
866:
1.1.1.16 christos 867: sshbuf_free(m);
1.1.1.24 christos 868: sshbuf_free(inc);
1.1 christos 869:
870: debug3("%s: done", __func__);
871: }
872:
873: static void
1.1.1.21 christos 874: recv_rexec_state(int fd, struct sshbuf *conf)
1.1 christos 875: {
1.1.1.24 christos 876: struct sshbuf *m, *inc;
1.1.1.21 christos 877: u_char *cp, ver;
878: size_t len;
879: int r;
1.1.1.24 christos 880: struct include_item *item;
1.1 christos 881:
882: debug3("%s: entering fd = %d", __func__, fd);
883:
1.1.1.24 christos 884: if ((m = sshbuf_new()) == NULL || (inc = sshbuf_new()) == NULL)
1.1.1.21 christos 885: fatal("%s: sshbuf_new failed", __func__);
886: if (ssh_msg_recv(fd, m) == -1)
1.1 christos 887: fatal("%s: ssh_msg_recv failed", __func__);
1.1.1.21 christos 888: if ((r = sshbuf_get_u8(m, &ver)) != 0)
889: fatal("%s: buffer error: %s", __func__, ssh_err(r));
890: if (ver != 0)
1.1 christos 891: fatal("%s: rexec version mismatch", __func__);
1.1.1.24 christos 892: if ((r = sshbuf_get_string(m, &cp, &len)) != 0 ||
893: (r = sshbuf_get_stringb(m, inc)) != 0)
1.1.1.21 christos 894: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1.1.24 christos 895:
1.1.1.21 christos 896: if (conf != NULL && (r = sshbuf_put(conf, cp, len)))
897: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 christos 898:
1.1.1.24 christos 899: while (sshbuf_len(inc) != 0) {
900: item = xcalloc(1, sizeof(*item));
901: if ((item->contents = sshbuf_new()) == NULL)
902: fatal("%s: sshbuf_new failed", __func__);
903: if ((r = sshbuf_get_cstring(inc, &item->selector, NULL)) != 0 ||
904: (r = sshbuf_get_cstring(inc, &item->filename, NULL)) != 0 ||
905: (r = sshbuf_get_stringb(inc, item->contents)) != 0)
906: fatal("%s: buffer error: %s", __func__, ssh_err(r));
907: TAILQ_INSERT_TAIL(&includes, item, entry);
908: }
909:
1.1.1.9 christos 910: free(cp);
1.1.1.21 christos 911: sshbuf_free(m);
1.1 christos 912:
913: debug3("%s: done", __func__);
914: }
915:
916: /* Accept a connection from inetd */
917: static void
918: server_accept_inetd(int *sock_in, int *sock_out)
919: {
920: int fd;
921:
922: if (rexeced_flag) {
923: close(REEXEC_CONFIG_PASS_FD);
924: *sock_in = *sock_out = dup(STDIN_FILENO);
925: } else {
926: *sock_in = dup(STDIN_FILENO);
927: *sock_out = dup(STDOUT_FILENO);
928: }
929: /*
930: * We intentionally do not close the descriptors 0, 1, and 2
931: * as our code for setting the descriptors won't work if
932: * ttyfd happens to be one of those.
933: */
934: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
935: dup2(fd, STDIN_FILENO);
936: dup2(fd, STDOUT_FILENO);
1.1.1.9 christos 937: if (!log_stderr)
938: dup2(fd, STDERR_FILENO);
939: if (fd > (log_stderr ? STDERR_FILENO : STDOUT_FILENO))
1.1 christos 940: close(fd);
941: }
942: debug("inetd sockets after dupping: %d, %d", *sock_in, *sock_out);
943: }
944:
945: /*
946: * Listen for TCP connections
947: */
948: static void
1.1.1.20 christos 949: listen_on_addrs(struct listenaddr *la)
1.1 christos 950: {
1.1.1.20 christos 951: int ret, listen_sock;
1.1 christos 952: struct addrinfo *ai;
953: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
954:
1.1.1.20 christos 955: for (ai = la->addrs; ai; ai = ai->ai_next) {
1.1 christos 956: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
957: continue;
958: if (num_listen_socks >= MAX_LISTEN_SOCKS)
959: fatal("Too many listen sockets. "
960: "Enlarge MAX_LISTEN_SOCKS");
961: if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen,
962: ntop, sizeof(ntop), strport, sizeof(strport),
963: NI_NUMERICHOST|NI_NUMERICSERV)) != 0) {
964: error("getnameinfo failed: %.100s",
965: ssh_gai_strerror(ret));
966: continue;
967: }
968: /* Create socket for listening. */
969: listen_sock = socket(ai->ai_family, ai->ai_socktype,
970: ai->ai_protocol);
1.1.1.23 christos 971: if (listen_sock == -1) {
1.1 christos 972: /* kernel may not support ipv6 */
973: verbose("socket: %.100s", strerror(errno));
974: continue;
975: }
976: if (set_nonblock(listen_sock) == -1) {
977: close(listen_sock);
978: continue;
979: }
1.1.1.18 christos 980: if (fcntl(listen_sock, F_SETFD, FD_CLOEXEC) == -1) {
981: verbose("socket: CLOEXEC: %s", strerror(errno));
982: close(listen_sock);
983: continue;
984: }
1.1.1.20 christos 985: /* Socket options */
986: set_reuseaddr(listen_sock);
987: if (la->rdomain != NULL &&
988: set_rdomain(listen_sock, la->rdomain) == -1) {
989: close(listen_sock);
990: continue;
991: }
1.1 christos 992:
993: debug("Bind to port %s on %s.", strport, ntop);
994:
995: /* Bind the socket to the desired port. */
1.1.1.23 christos 996: if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) == -1) {
1.1 christos 997: error("Bind to port %s on %s failed: %.200s.",
998: strport, ntop, strerror(errno));
999: close(listen_sock);
1000: continue;
1001: }
1002: listen_socks[num_listen_socks] = listen_sock;
1003: num_listen_socks++;
1004:
1005: /* Start listening on the port. */
1.1.1.23 christos 1006: if (listen(listen_sock, SSH_LISTEN_BACKLOG) == -1)
1.1 christos 1007: fatal("listen on [%s]:%s: %.100s",
1008: ntop, strport, strerror(errno));
1.1.1.20 christos 1009: logit("Server listening on %s port %s%s%s.",
1010: ntop, strport,
1011: la->rdomain == NULL ? "" : " rdomain ",
1012: la->rdomain == NULL ? "" : la->rdomain);
1.1 christos 1013: }
1.1.1.20 christos 1014: }
1015:
1016: static void
1017: server_listen(void)
1018: {
1019: u_int i;
1020:
1021: for (i = 0; i < options.num_listen_addrs; i++) {
1022: listen_on_addrs(&options.listen_addrs[i]);
1023: freeaddrinfo(options.listen_addrs[i].addrs);
1024: free(options.listen_addrs[i].rdomain);
1025: memset(&options.listen_addrs[i], 0,
1026: sizeof(options.listen_addrs[i]));
1027: }
1028: free(options.listen_addrs);
1029: options.listen_addrs = NULL;
1030: options.num_listen_addrs = 0;
1.1 christos 1031:
1032: if (!num_listen_socks)
1033: fatal("Cannot bind any address.");
1034: }
1035:
1036: /*
1037: * The main TCP accept loop. Note that, for the non-debug case, returns
1038: * from this function are in a forked subprocess.
1039: */
1040: static void
1041: server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s)
1042: {
1043: fd_set *fdset;
1044: int i, j, ret, maxfd;
1.1.1.24 christos 1045: int ostartups = -1, startups = 0, listening = 0, lameduck = 0;
1.1 christos 1046: int startup_p[2] = { -1 , -1 };
1.1.1.22 christos 1047: char c = 0;
1.1 christos 1048: struct sockaddr_storage from;
1049: socklen_t fromlen;
1050: pid_t pid;
1051:
1052: /* setup fd set for accept */
1053: fdset = NULL;
1054: maxfd = 0;
1055: for (i = 0; i < num_listen_socks; i++)
1056: if (listen_socks[i] > maxfd)
1057: maxfd = listen_socks[i];
1.1.1.25! christos 1058: /* pipes connected to unauthenticated child sshd processes */
1.1 christos 1059: startup_pipes = xcalloc(options.max_startups, sizeof(int));
1.1.1.22 christos 1060: startup_flags = xcalloc(options.max_startups, sizeof(int));
1.1 christos 1061: for (i = 0; i < options.max_startups; i++)
1062: startup_pipes[i] = -1;
1063:
1064: /*
1065: * Stay listening for connections until the system crashes or
1066: * the daemon is killed with a signal.
1067: */
1068: for (;;) {
1.1.1.24 christos 1069: if (ostartups != startups) {
1070: setproctitle("%s [listener] %d of %d-%d startups",
1071: listener_proctitle, startups,
1072: options.max_startups_begin, options.max_startups);
1073: ostartups = startups;
1074: }
1.1.1.22 christos 1075: if (received_sighup) {
1076: if (!lameduck) {
1077: debug("Received SIGHUP; waiting for children");
1078: close_listen_socks();
1079: lameduck = 1;
1080: }
1081: if (listening <= 0)
1082: sighup_restart();
1083: }
1.1.1.15 christos 1084: free(fdset);
1.1.1.14 christos 1085: fdset = xcalloc(howmany(maxfd + 1, NFDBITS),
1.1 christos 1086: sizeof(fd_mask));
1087:
1088: for (i = 0; i < num_listen_socks; i++)
1089: FD_SET(listen_socks[i], fdset);
1090: for (i = 0; i < options.max_startups; i++)
1091: if (startup_pipes[i] != -1)
1092: FD_SET(startup_pipes[i], fdset);
1093:
1094: /* Wait in select until there is a connection. */
1095: ret = select(maxfd+1, fdset, NULL, NULL, NULL);
1.1.1.23 christos 1096: if (ret == -1 && errno != EINTR)
1.1 christos 1097: error("select: %.100s", strerror(errno));
1098: if (received_sigterm) {
1099: logit("Received signal %d; terminating.",
1100: (int) received_sigterm);
1101: close_listen_socks();
1.1.1.11 christos 1102: if (options.pid_file != NULL)
1103: unlink(options.pid_file);
1.1.1.5 christos 1104: exit(received_sigterm == SIGTERM ? 0 : 255);
1.1 christos 1105: }
1.1.1.23 christos 1106: if (ret == -1)
1.1 christos 1107: continue;
1108:
1.1.1.22 christos 1109: for (i = 0; i < options.max_startups; i++) {
1110: if (startup_pipes[i] == -1 ||
1111: !FD_ISSET(startup_pipes[i], fdset))
1112: continue;
1113: switch (read(startup_pipes[i], &c, sizeof(c))) {
1114: case -1:
1115: if (errno == EINTR || errno == EAGAIN)
1116: continue;
1117: if (errno != EPIPE) {
1118: error("%s: startup pipe %d (fd=%d): "
1119: "read %s", __func__, i,
1120: startup_pipes[i], strerror(errno));
1121: }
1122: /* FALLTHROUGH */
1123: case 0:
1124: /* child exited or completed auth */
1.1 christos 1125: close(startup_pipes[i]);
1126: startup_pipes[i] = -1;
1127: startups--;
1.1.1.22 christos 1128: if (startup_flags[i])
1129: listening--;
1130: break;
1131: case 1:
1132: /* child has finished preliminaries */
1133: if (startup_flags[i]) {
1134: listening--;
1135: startup_flags[i] = 0;
1136: }
1137: break;
1.1 christos 1138: }
1.1.1.22 christos 1139: }
1.1 christos 1140: for (i = 0; i < num_listen_socks; i++) {
1141: if (!FD_ISSET(listen_socks[i], fdset))
1142: continue;
1143: fromlen = sizeof(from);
1144: *newsock = accept(listen_socks[i],
1145: (struct sockaddr *)&from, &fromlen);
1.1.1.23 christos 1146: if (*newsock == -1) {
1.1.1.9 christos 1147: if (errno != EINTR && errno != EWOULDBLOCK &&
1148: errno != ECONNABORTED)
1.1.1.7 christos 1149: error("accept: %.100s",
1150: strerror(errno));
1151: if (errno == EMFILE || errno == ENFILE)
1152: usleep(100 * 1000);
1.1 christos 1153: continue;
1154: }
1155: if (unset_nonblock(*newsock) == -1) {
1156: close(*newsock);
1157: continue;
1158: }
1159: if (drop_connection(startups) == 1) {
1.1.1.17 christos 1160: char *laddr = get_local_ipaddr(*newsock);
1161: char *raddr = get_peer_ipaddr(*newsock);
1.1.1.24 christos 1162: char msg[] = "Exceeded MaxStartups\r\n";
1.1.1.17 christos 1163:
1164: verbose("drop connection #%d from [%s]:%d "
1165: "on [%s]:%d past MaxStartups", startups,
1166: raddr, get_peer_port(*newsock),
1167: laddr, get_local_port(*newsock));
1168: free(laddr);
1169: free(raddr);
1.1.1.24 christos 1170: /* best-effort notification to client */
1171: (void)write(*newsock, msg, strlen(msg));
1.1 christos 1172: close(*newsock);
1173: continue;
1174: }
1175: if (pipe(startup_p) == -1) {
1176: close(*newsock);
1177: continue;
1178: }
1179:
1180: if (rexec_flag && socketpair(AF_UNIX,
1181: SOCK_STREAM, 0, config_s) == -1) {
1182: error("reexec socketpair: %s",
1183: strerror(errno));
1184: close(*newsock);
1185: close(startup_p[0]);
1186: close(startup_p[1]);
1187: continue;
1188: }
1189:
1190: for (j = 0; j < options.max_startups; j++)
1191: if (startup_pipes[j] == -1) {
1192: startup_pipes[j] = startup_p[0];
1193: if (maxfd < startup_p[0])
1194: maxfd = startup_p[0];
1195: startups++;
1.1.1.22 christos 1196: startup_flags[j] = 1;
1.1 christos 1197: break;
1198: }
1199:
1200: /*
1201: * Got connection. Fork a child to handle it, unless
1202: * we are in debugging mode.
1203: */
1204: if (debug_flag) {
1205: /*
1206: * In debugging mode. Close the listening
1207: * socket, and start processing the
1208: * connection without forking.
1209: */
1210: debug("Server will not fork when running in debugging mode.");
1211: close_listen_socks();
1212: *sock_in = *newsock;
1213: *sock_out = *newsock;
1214: close(startup_p[0]);
1215: close(startup_p[1]);
1216: startup_pipe = -1;
1217: pid = getpid();
1218: if (rexec_flag) {
1.1.1.21 christos 1219: send_rexec_state(config_s[0], cfg);
1.1 christos 1220: close(config_s[0]);
1221: }
1.1.1.22 christos 1222: return;
1.1 christos 1223: }
1224:
1225: /*
1226: * Normal production daemon. Fork, and have
1227: * the child process the connection. The
1228: * parent continues listening.
1229: */
1.1.1.22 christos 1230: listening++;
1.1 christos 1231: if ((pid = fork()) == 0) {
1232: /*
1233: * Child. Close the listening and
1234: * max_startup sockets. Start using
1235: * the accepted socket. Reinitialize
1236: * logging (since our pid has changed).
1.1.1.22 christos 1237: * We return from this function to handle
1.1 christos 1238: * the connection.
1239: */
1240: startup_pipe = startup_p[1];
1241: close_startup_pipes();
1242: close_listen_socks();
1243: *sock_in = *newsock;
1244: *sock_out = *newsock;
1245: log_init(__progname,
1246: options.log_level,
1247: options.log_facility,
1248: log_stderr);
1249: if (rexec_flag)
1250: close(config_s[0]);
1.1.1.22 christos 1251: else {
1252: /*
1253: * Signal parent that the preliminaries
1254: * for this child are complete. For the
1255: * re-exec case, this happens after the
1256: * child has received the rexec state
1257: * from the server.
1258: */
1259: (void)atomicio(vwrite, startup_pipe,
1260: "\0", 1);
1261: }
1262: return;
1.1 christos 1263: }
1264:
1265: /* Parent. Stay in the loop. */
1.1.1.23 christos 1266: if (pid == -1)
1.1 christos 1267: error("fork: %.100s", strerror(errno));
1268: else
1269: debug("Forked child %ld.", (long)pid);
1270:
1271: close(startup_p[1]);
1272:
1273: if (rexec_flag) {
1.1.1.21 christos 1274: send_rexec_state(config_s[0], cfg);
1.1 christos 1275: close(config_s[0]);
1276: close(config_s[1]);
1277: }
1278: close(*newsock);
1279: }
1280: }
1281: }
1282:
1.1.1.16 christos 1283: /*
1284: * If IP options are supported, make sure there are none (log and
1285: * return an error if any are found). Basically we are worried about
1286: * source routing; it can be used to pretend you are somebody
1287: * (ip-address) you are not. That itself may be "almost acceptable"
1.1.1.21 christos 1288: * under certain circumstances, but rhosts authentication is useless
1.1.1.16 christos 1289: * if source routing is accepted. Notice also that if we just dropped
1290: * source routing here, the other side could use IP spoofing to do
1291: * rest of the interaction and could still bypass security. So we
1292: * exit here if we detect any IP options.
1293: */
1294: static void
1295: check_ip_options(struct ssh *ssh)
1296: {
1297: int sock_in = ssh_packet_get_connection_in(ssh);
1298: struct sockaddr_storage from;
1299: u_char opts[200];
1.1.1.17 christos 1300: socklen_t i, option_size = sizeof(opts), fromlen = sizeof(from);
1.1.1.16 christos 1301: char text[sizeof(opts) * 3 + 1];
1302:
1303: memset(&from, 0, sizeof(from));
1304: if (getpeername(sock_in, (struct sockaddr *)&from,
1.1.1.23 christos 1305: &fromlen) == -1)
1.1.1.16 christos 1306: return;
1307: if (from.ss_family != AF_INET)
1308: return;
1309: /* XXX IPv6 options? */
1310:
1311: if (getsockopt(sock_in, IPPROTO_IP, IP_OPTIONS, opts,
1312: &option_size) >= 0 && option_size != 0) {
1313: text[0] = '\0';
1314: for (i = 0; i < option_size; i++)
1315: snprintf(text + i*3, sizeof(text) - i*3,
1316: " %2.2x", opts[i]);
1317: fatal("Connection from %.100s port %d with IP opts: %.800s",
1318: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text);
1319: }
1320: return;
1321: }
1.1 christos 1322:
1.1.1.20 christos 1323: /* Set the routing domain for this process */
1324: static void
1325: set_process_rdomain(struct ssh *ssh, const char *name)
1326: {
1327: int rtable, ortable = getrtable();
1328: const char *errstr;
1329:
1330: if (name == NULL)
1331: return; /* default */
1332:
1333: if (strcmp(name, "%D") == 0) {
1334: /* "expands" to routing domain of connection */
1335: if ((name = ssh_packet_rdomain_in(ssh)) == NULL)
1336: return;
1337: }
1338:
1339: rtable = (int)strtonum(name, 0, 255, &errstr);
1340: if (errstr != NULL) /* Shouldn't happen */
1341: fatal("Invalid routing domain \"%s\": %s", name, errstr);
1342: if (rtable != ortable && setrtable(rtable) != 0)
1343: fatal("Unable to set routing domain %d: %s",
1344: rtable, strerror(errno));
1345: debug("%s: set routing domain %d (was %d)", __func__, rtable, ortable);
1346: }
1347:
1.1.1.21 christos 1348: static void
1349: accumulate_host_timing_secret(struct sshbuf *server_cfg,
1.1.1.23 christos 1350: struct sshkey *key)
1.1.1.21 christos 1351: {
1352: static struct ssh_digest_ctx *ctx;
1353: u_char *hash;
1354: size_t len;
1355: struct sshbuf *buf;
1356: int r;
1357:
1358: if (ctx == NULL && (ctx = ssh_digest_start(SSH_DIGEST_SHA512)) == NULL)
1359: fatal("%s: ssh_digest_start", __func__);
1360: if (key == NULL) { /* finalize */
1361: /* add server config in case we are using agent for host keys */
1362: if (ssh_digest_update(ctx, sshbuf_ptr(server_cfg),
1363: sshbuf_len(server_cfg)) != 0)
1364: fatal("%s: ssh_digest_update", __func__);
1365: len = ssh_digest_bytes(SSH_DIGEST_SHA512);
1366: hash = xmalloc(len);
1367: if (ssh_digest_final(ctx, hash, len) != 0)
1368: fatal("%s: ssh_digest_final", __func__);
1369: options.timing_secret = PEEK_U64(hash);
1370: freezero(hash, len);
1371: ssh_digest_free(ctx);
1372: ctx = NULL;
1373: return;
1374: }
1375: if ((buf = sshbuf_new()) == NULL)
1376: fatal("%s could not allocate buffer", __func__);
1377: if ((r = sshkey_private_serialize(key, buf)) != 0)
1378: fatal("sshkey_private_serialize: %s", ssh_err(r));
1379: if (ssh_digest_update(ctx, sshbuf_ptr(buf), sshbuf_len(buf)) != 0)
1380: fatal("%s: ssh_digest_update", __func__);
1381: sshbuf_reset(buf);
1382: sshbuf_free(buf);
1383: }
1384:
1.1.1.24 christos 1385: static char *
1386: prepare_proctitle(int ac, char **av)
1387: {
1388: char *ret = NULL;
1389: int i;
1390:
1391: for (i = 0; i < ac; i++)
1392: xextendf(&ret, " ", "%s", av[i]);
1393: return ret;
1394: }
1395:
1.1 christos 1396: /*
1397: * Main program for the daemon.
1398: */
1399: int
1400: main(int ac, char **av)
1401: {
1.1.1.16 christos 1402: struct ssh *ssh = NULL;
1.1 christos 1403: extern char *optarg;
1404: extern int optind;
1.1.1.20 christos 1405: int r, opt, on = 1, already_daemon, remote_port;
1.1 christos 1406: int sock_in = -1, sock_out = -1, newsock = -1;
1.1.1.20 christos 1407: const char *remote_ip, *rdomain;
1.1.1.12 christos 1408: char *fp, *line, *laddr, *logfile = NULL;
1.1 christos 1409: int config_s[2] = { -1 , -1 };
1.1.1.20 christos 1410: u_int i, j;
1.1 christos 1411: u_int64_t ibytes, obytes;
1412: mode_t new_umask;
1.1.1.19 christos 1413: struct sshkey *key;
1414: struct sshkey *pubkey;
1.1.1.9 christos 1415: int keytype;
1.1 christos 1416: Authctxt *authctxt;
1.1.1.20 christos 1417: struct connection_info *connection_info = NULL;
1.1 christos 1418:
1419: /* Save argv. */
1420: saved_argv = av;
1421: rexec_argc = ac;
1422:
1423: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1424: sanitise_stdfd();
1425:
1426: /* Initialize configuration options to their default values. */
1427: initialize_server_options(&options);
1428:
1429: /* Parse command-line arguments. */
1.1.1.12 christos 1430: while ((opt = getopt(ac, av,
1431: "C:E:b:c:f:g:h:k:o:p:u:46DQRTdeiqrt")) != -1) {
1.1 christos 1432: switch (opt) {
1433: case '4':
1434: options.address_family = AF_INET;
1435: break;
1436: case '6':
1437: options.address_family = AF_INET6;
1438: break;
1439: case 'f':
1440: config_file_name = optarg;
1441: break;
1.1.1.3 adam 1442: case 'c':
1.1.1.20 christos 1443: servconf_add_hostcert("[command-line]", 0,
1444: &options, optarg);
1.1.1.3 adam 1445: break;
1.1 christos 1446: case 'd':
1447: if (debug_flag == 0) {
1448: debug_flag = 1;
1449: options.log_level = SYSLOG_LEVEL_DEBUG1;
1450: } else if (options.log_level < SYSLOG_LEVEL_DEBUG3)
1451: options.log_level++;
1452: break;
1453: case 'D':
1454: no_daemon_flag = 1;
1455: break;
1.1.1.9 christos 1456: case 'E':
1.1.1.15 christos 1457: logfile = optarg;
1.1.1.9 christos 1458: /* FALLTHROUGH */
1.1 christos 1459: case 'e':
1460: log_stderr = 1;
1461: break;
1462: case 'i':
1463: inetd_flag = 1;
1464: break;
1465: case 'r':
1466: rexec_flag = 0;
1467: break;
1468: case 'R':
1469: rexeced_flag = 1;
1470: inetd_flag = 1;
1471: break;
1472: case 'Q':
1473: /* ignored */
1474: break;
1475: case 'q':
1476: options.log_level = SYSLOG_LEVEL_QUIET;
1477: break;
1478: case 'b':
1.1.1.17 christos 1479: /* protocol 1, ignored */
1.1 christos 1480: break;
1481: case 'p':
1482: options.ports_from_cmdline = 1;
1483: if (options.num_ports >= MAX_PORTS) {
1484: fprintf(stderr, "too many ports.\n");
1485: exit(1);
1486: }
1487: options.ports[options.num_ports++] = a2port(optarg);
1488: if (options.ports[options.num_ports-1] <= 0) {
1489: fprintf(stderr, "Bad port number.\n");
1490: exit(1);
1491: }
1492: break;
1493: case 'g':
1494: if ((options.login_grace_time = convtime(optarg)) == -1) {
1495: fprintf(stderr, "Invalid login grace time.\n");
1496: exit(1);
1497: }
1498: break;
1499: case 'k':
1.1.1.17 christos 1500: /* protocol 1, ignored */
1.1 christos 1501: break;
1502: case 'h':
1.1.1.20 christos 1503: servconf_add_hostkey("[command-line]", 0,
1.1.1.22 christos 1504: &options, optarg, 1);
1.1 christos 1505: break;
1506: case 't':
1507: test_flag = 1;
1508: break;
1509: case 'T':
1510: test_flag = 2;
1511: break;
1512: case 'C':
1.1.1.22 christos 1513: connection_info = get_connection_info(ssh, 0, 0);
1.1.1.7 christos 1514: if (parse_server_match_testspec(connection_info,
1515: optarg) == -1)
1516: exit(1);
1.1 christos 1517: break;
1518: case 'u':
1.1.1.11 christos 1519: utmp_len = (u_int)strtonum(optarg, 0, HOST_NAME_MAX+1+1, NULL);
1520: if (utmp_len > HOST_NAME_MAX+1) {
1.1 christos 1521: fprintf(stderr, "Invalid utmp length.\n");
1522: exit(1);
1523: }
1524: break;
1525: case 'o':
1526: line = xstrdup(optarg);
1527: if (process_server_config_line(&options, line,
1.1.1.24 christos 1528: "command-line", 0, NULL, NULL, &includes) != 0)
1.1 christos 1529: exit(1);
1.1.1.9 christos 1530: free(line);
1.1 christos 1531: break;
1532: case '?':
1533: default:
1534: usage();
1535: break;
1536: }
1537: }
1538: if (rexeced_flag || inetd_flag)
1539: rexec_flag = 0;
1.1.1.22 christos 1540: if (!test_flag && rexec_flag && !path_absolute(av[0]))
1.1 christos 1541: fatal("sshd re-exec requires execution with an absolute path");
1542: if (rexeced_flag)
1543: closefrom(REEXEC_MIN_FREE_FD);
1544: else
1545: closefrom(REEXEC_DEVCRYPTO_RESERVED_FD);
1546:
1.1.1.10 christos 1547: #ifdef WITH_OPENSSL
1.1.1.4 christos 1548: OpenSSL_add_all_algorithms();
1.1.1.10 christos 1549: #endif
1.1 christos 1550:
1.1.1.9 christos 1551: /* If requested, redirect the logs to the specified logfile. */
1.1.1.15 christos 1552: if (logfile != NULL)
1.1.1.9 christos 1553: log_redirect_stderr_to(logfile);
1.1 christos 1554: /*
1555: * Force logging to stderr until we have loaded the private host
1556: * key (unless started from inetd)
1557: */
1558: log_init(__progname,
1559: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1560: SYSLOG_LEVEL_INFO : options.log_level,
1561: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1562: SYSLOG_FACILITY_AUTH : options.log_facility,
1.1.1.24 christos 1563: log_stderr || !inetd_flag || debug_flag);
1.1 christos 1564:
1565: sensitive_data.have_ssh2_key = 0;
1566:
1567: /*
1.1.1.20 christos 1568: * If we're not doing an extended test do not silently ignore connection
1569: * test params.
1.1 christos 1570: */
1.1.1.20 christos 1571: if (test_flag < 2 && connection_info != NULL)
1.1 christos 1572: fatal("Config test connection parameter (-C) provided without "
1573: "test mode (-T)");
1574:
1575: /* Fetch our configuration */
1.1.1.21 christos 1576: if ((cfg = sshbuf_new()) == NULL)
1577: fatal("%s: sshbuf_new failed", __func__);
1.1.1.22 christos 1578: if (rexeced_flag) {
1.1.1.21 christos 1579: recv_rexec_state(REEXEC_CONFIG_PASS_FD, cfg);
1.1.1.22 christos 1580: if (!debug_flag) {
1581: startup_pipe = dup(REEXEC_STARTUP_PIPE_FD);
1582: close(REEXEC_STARTUP_PIPE_FD);
1583: /*
1584: * Signal parent that this child is at a point where
1585: * they can go away if they have a SIGHUP pending.
1586: */
1587: (void)atomicio(vwrite, startup_pipe, "\0", 1);
1588: }
1.1.1.24 christos 1589: } else if (strcasecmp(config_file_name, "none") != 0)
1.1.1.21 christos 1590: load_server_config(config_file_name, cfg);
1.1 christos 1591:
1592: parse_server_config(&options, rexeced_flag ? "rexec" : config_file_name,
1.1.1.24 christos 1593: cfg, &includes, NULL);
1.1 christos 1594:
1595: /* Fill in default values for those options not explicitly set. */
1596: fill_default_server_options(&options);
1597:
1598: /* challenge-response is implemented via keyboard interactive */
1599: if (options.challenge_response_authentication)
1600: options.kbd_interactive_authentication = 1;
1601:
1.1.1.8 christos 1602: /* Check that options are sensible */
1603: if (options.authorized_keys_command_user == NULL &&
1604: (options.authorized_keys_command != NULL &&
1605: strcasecmp(options.authorized_keys_command, "none") != 0))
1606: fatal("AuthorizedKeysCommand set without "
1607: "AuthorizedKeysCommandUser");
1.1.1.12 christos 1608: if (options.authorized_principals_command_user == NULL &&
1609: (options.authorized_principals_command != NULL &&
1610: strcasecmp(options.authorized_principals_command, "none") != 0))
1611: fatal("AuthorizedPrincipalsCommand set without "
1612: "AuthorizedPrincipalsCommandUser");
1.1.1.8 christos 1613:
1614: /*
1615: * Check whether there is any path through configured auth methods.
1616: * Unfortunately it is not possible to verify this generally before
1617: * daemonisation in the presence of Match block, but this catches
1618: * and warns for trivial misconfigurations that could break login.
1619: */
1620: if (options.num_auth_methods != 0) {
1.1.1.20 christos 1621: for (i = 0; i < options.num_auth_methods; i++) {
1622: if (auth2_methods_valid(options.auth_methods[i],
1.1.1.8 christos 1623: 1) == 0)
1624: break;
1625: }
1.1.1.20 christos 1626: if (i >= options.num_auth_methods)
1.1.1.8 christos 1627: fatal("AuthenticationMethods cannot be satisfied by "
1628: "enabled authentication methods");
1629: }
1630:
1.1 christos 1631: /* Check that there are no remaining arguments. */
1632: if (optind < ac) {
1633: fprintf(stderr, "Extra argument %s.\n", av[optind]);
1634: exit(1);
1635: }
1636:
1.1.1.8 christos 1637: debug("sshd version %s, %s", SSH_VERSION,
1.1.1.10 christos 1638: #ifdef WITH_OPENSSL
1.1.1.22 christos 1639: OpenSSL_version(OPENSSL_VERSION)
1.1.1.10 christos 1640: #else
1641: "without OpenSSL"
1642: #endif
1643: );
1.1 christos 1644:
1.1.1.9 christos 1645: /* load host keys */
1.1 christos 1646: sensitive_data.host_keys = xcalloc(options.num_host_key_files,
1.1.1.19 christos 1647: sizeof(struct sshkey *));
1.1.1.9 christos 1648: sensitive_data.host_pubkeys = xcalloc(options.num_host_key_files,
1.1.1.19 christos 1649: sizeof(struct sshkey *));
1.1.1.9 christos 1650:
1651: if (options.host_key_agent) {
1652: if (strcmp(options.host_key_agent, SSH_AUTHSOCKET_ENV_NAME))
1653: setenv(SSH_AUTHSOCKET_ENV_NAME,
1654: options.host_key_agent, 1);
1.1.1.11 christos 1655: if ((r = ssh_get_authentication_socket(NULL)) == 0)
1656: have_agent = 1;
1657: else
1658: error("Could not connect to agent \"%s\": %s",
1659: options.host_key_agent, ssh_err(r));
1.1.1.9 christos 1660: }
1.1 christos 1661:
1662: for (i = 0; i < options.num_host_key_files; i++) {
1.1.1.22 christos 1663: int ll = options.host_key_file_userprovided[i] ?
1664: SYSLOG_LEVEL_ERROR : SYSLOG_LEVEL_DEBUG1;
1665:
1.1.1.11 christos 1666: if (options.host_key_files[i] == NULL)
1667: continue;
1.1.1.21 christos 1668: if ((r = sshkey_load_private(options.host_key_files[i], "",
1669: &key, NULL)) != 0 && r != SSH_ERR_SYSTEM_ERROR)
1.1.1.22 christos 1670: do_log2(ll, "Unable to load host key \"%s\": %s",
1.1.1.21 christos 1671: options.host_key_files[i], ssh_err(r));
1.1.1.24 christos 1672: if (sshkey_is_sk(key) &&
1673: key->sk_flags & SSH_SK_USER_PRESENCE_REQD) {
1674: debug("host key %s requires user presence, ignoring",
1675: options.host_key_files[i]);
1676: key->sk_flags &= ~SSH_SK_USER_PRESENCE_REQD;
1677: }
1678: if (r == 0 && key != NULL &&
1679: (r = sshkey_shield_private(key)) != 0) {
1.1.1.23 christos 1680: do_log2(ll, "Unable to shield host key \"%s\": %s",
1681: options.host_key_files[i], ssh_err(r));
1682: sshkey_free(key);
1683: key = NULL;
1684: }
1.1.1.21 christos 1685: if ((r = sshkey_load_public(options.host_key_files[i],
1686: &pubkey, NULL)) != 0 && r != SSH_ERR_SYSTEM_ERROR)
1.1.1.22 christos 1687: do_log2(ll, "Unable to load host key \"%s\": %s",
1.1.1.21 christos 1688: options.host_key_files[i], ssh_err(r));
1.1.1.11 christos 1689: if (pubkey == NULL && key != NULL)
1.1.1.22 christos 1690: if ((r = sshkey_from_private(key, &pubkey)) != 0)
1.1.1.21 christos 1691: fatal("Could not demote key: \"%s\": %s",
1692: options.host_key_files[i], ssh_err(r));
1.1 christos 1693: sensitive_data.host_keys[i] = key;
1.1.1.9 christos 1694: sensitive_data.host_pubkeys[i] = pubkey;
1695:
1.1.1.17 christos 1696: if (key == NULL && pubkey != NULL && have_agent) {
1.1.1.9 christos 1697: debug("will rely on agent for hostkey %s",
1698: options.host_key_files[i]);
1699: keytype = pubkey->type;
1700: } else if (key != NULL) {
1701: keytype = key->type;
1.1.1.21 christos 1702: accumulate_host_timing_secret(cfg, key);
1.1.1.9 christos 1703: } else {
1.1.1.22 christos 1704: do_log2(ll, "Unable to load host key: %s",
1.1 christos 1705: options.host_key_files[i]);
1706: sensitive_data.host_keys[i] = NULL;
1.1.1.9 christos 1707: sensitive_data.host_pubkeys[i] = NULL;
1.1 christos 1708: continue;
1709: }
1.1.1.9 christos 1710:
1711: switch (keytype) {
1.1 christos 1712: case KEY_RSA:
1713: case KEY_DSA:
1.1.1.4 christos 1714: case KEY_ECDSA:
1.1.1.10 christos 1715: case KEY_ED25519:
1.1.1.24 christos 1716: case KEY_ECDSA_SK:
1717: case KEY_ED25519_SK:
1.1.1.20 christos 1718: case KEY_XMSS:
1.1.1.11 christos 1719: if (have_agent || key != NULL)
1720: sensitive_data.have_ssh2_key = 1;
1.1 christos 1721: break;
1722: }
1.1.1.11 christos 1723: if ((fp = sshkey_fingerprint(pubkey, options.fingerprint_hash,
1724: SSH_FP_DEFAULT)) == NULL)
1725: fatal("sshkey_fingerprint failed");
1726: debug("%s host key #%d: %s %s",
1.1.1.17 christos 1727: key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp);
1.1.1.11 christos 1728: free(fp);
1.1 christos 1729: }
1.1.1.21 christos 1730: accumulate_host_timing_secret(cfg, NULL);
1.1.1.17 christos 1731: if (!sensitive_data.have_ssh2_key) {
1.1 christos 1732: logit("sshd: no hostkeys available -- exiting.");
1733: exit(1);
1734: }
1735:
1.1.1.3 adam 1736: /*
1737: * Load certificates. They are stored in an array at identical
1738: * indices to the public keys that they relate to.
1739: */
1740: sensitive_data.host_certificates = xcalloc(options.num_host_key_files,
1.1.1.19 christos 1741: sizeof(struct sshkey *));
1.1.1.3 adam 1742: for (i = 0; i < options.num_host_key_files; i++)
1743: sensitive_data.host_certificates[i] = NULL;
1744:
1745: for (i = 0; i < options.num_host_cert_files; i++) {
1.1.1.11 christos 1746: if (options.host_cert_files[i] == NULL)
1747: continue;
1.1.1.21 christos 1748: if ((r = sshkey_load_public(options.host_cert_files[i],
1749: &key, NULL)) != 0) {
1750: error("Could not load host certificate \"%s\": %s",
1751: options.host_cert_files[i], ssh_err(r));
1.1.1.3 adam 1752: continue;
1753: }
1.1.1.21 christos 1754: if (!sshkey_is_cert(key)) {
1.1.1.3 adam 1755: error("Certificate file is not a certificate: %s",
1756: options.host_cert_files[i]);
1.1.1.21 christos 1757: sshkey_free(key);
1.1.1.3 adam 1758: continue;
1759: }
1760: /* Find matching private key */
1761: for (j = 0; j < options.num_host_key_files; j++) {
1.1.1.21 christos 1762: if (sshkey_equal_public(key,
1.1.1.3 adam 1763: sensitive_data.host_keys[j])) {
1764: sensitive_data.host_certificates[j] = key;
1765: break;
1766: }
1767: }
1768: if (j >= options.num_host_key_files) {
1769: error("No matching private key for certificate: %s",
1770: options.host_cert_files[i]);
1.1.1.21 christos 1771: sshkey_free(key);
1.1.1.3 adam 1772: continue;
1773: }
1774: sensitive_data.host_certificates[j] = key;
1.1.1.20 christos 1775: debug("host certificate: #%u type %d %s", j, key->type,
1.1.1.21 christos 1776: sshkey_type(key));
1.1.1.3 adam 1777: }
1.1.1.10 christos 1778:
1.1 christos 1779: if (use_privsep) {
1780: struct stat st;
1781:
1782: if (getpwnam(SSH_PRIVSEP_USER) == NULL)
1783: fatal("Privilege separation user %s does not exist",
1784: SSH_PRIVSEP_USER);
1.1.1.20 christos 1785: endpwent();
1.1 christos 1786: if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) ||
1787: (S_ISDIR(st.st_mode) == 0))
1788: fatal("Missing privilege separation directory: %s",
1789: _PATH_PRIVSEP_CHROOT_DIR);
1790: if (st.st_uid != 0 || (st.st_mode & (S_IWGRP|S_IWOTH)) != 0)
1791: fatal("%s must be owned by root and not group or "
1792: "world-writable.", _PATH_PRIVSEP_CHROOT_DIR);
1793: }
1794:
1795: if (test_flag > 1) {
1.1.1.20 christos 1796: /*
1797: * If no connection info was provided by -C then use
1798: * use a blank one that will cause no predicate to match.
1799: */
1800: if (connection_info == NULL)
1.1.1.22 christos 1801: connection_info = get_connection_info(ssh, 0, 0);
1.1.1.23 christos 1802: connection_info->test = 1;
1.1.1.24 christos 1803: parse_server_match_config(&options, &includes, connection_info);
1.1 christos 1804: dump_config(&options);
1805: }
1806:
1807: /* Configuration looks good, so exit if in test mode. */
1808: if (test_flag)
1809: exit(0);
1810:
1811: if (rexec_flag) {
1.1.1.20 christos 1812: if (rexec_argc < 0)
1813: fatal("rexec_argc %d < 0", rexec_argc);
1.1 christos 1814: rexec_argv = xcalloc(rexec_argc + 2, sizeof(char *));
1.1.1.20 christos 1815: for (i = 0; i < (u_int)rexec_argc; i++) {
1.1 christos 1816: debug("rexec_argv[%d]='%s'", i, saved_argv[i]);
1817: rexec_argv[i] = saved_argv[i];
1818: }
1819: rexec_argv[rexec_argc] = "-R";
1820: rexec_argv[rexec_argc + 1] = NULL;
1821: }
1.1.1.24 christos 1822: listener_proctitle = prepare_proctitle(ac, av);
1.1 christos 1823:
1824: /* Ensure that umask disallows at least group and world write */
1825: new_umask = umask(0077) | 0022;
1826: (void) umask(new_umask);
1827:
1828: /* Initialize the log (it is reinitialized below in case we forked). */
1829: if (debug_flag && (!inetd_flag || rexeced_flag))
1830: log_stderr = 1;
1831: log_init(__progname, options.log_level, options.log_facility, log_stderr);
1832:
1833: /*
1.1.1.17 christos 1834: * If not in debugging mode, not started from inetd and not already
1835: * daemonized (eg re-exec via SIGHUP), disconnect from the controlling
1836: * terminal, and fork. The original process exits.
1.1 christos 1837: */
1.1.1.17 christos 1838: already_daemon = daemonized();
1839: if (!(debug_flag || inetd_flag || no_daemon_flag || already_daemon)) {
1.1 christos 1840:
1.1.1.23 christos 1841: if (daemon(0, 0) == -1)
1.1 christos 1842: fatal("daemon() failed: %.200s", strerror(errno));
1843:
1.1.1.17 christos 1844: disconnect_controlling_tty();
1.1 christos 1845: }
1846: /* Reinitialize the log (because of the fork above). */
1847: log_init(__progname, options.log_level, options.log_facility, log_stderr);
1848:
1849: /* Chdir to the root directory so that the current disk can be
1850: unmounted if desired. */
1.1.1.9 christos 1851: if (chdir("/") == -1)
1852: error("chdir(\"/\"): %s", strerror(errno));
1.1 christos 1853:
1854: /* ignore SIGPIPE */
1.1.1.24 christos 1855: ssh_signal(SIGPIPE, SIG_IGN);
1.1 christos 1856:
1857: /* Get a connection, either from inetd or a listening TCP socket */
1858: if (inetd_flag) {
1859: server_accept_inetd(&sock_in, &sock_out);
1860: } else {
1861: server_listen();
1862:
1.1.1.24 christos 1863: ssh_signal(SIGHUP, sighup_handler);
1864: ssh_signal(SIGCHLD, main_sigchld_handler);
1865: ssh_signal(SIGTERM, sigterm_handler);
1866: ssh_signal(SIGQUIT, sigterm_handler);
1.1 christos 1867:
1868: /*
1869: * Write out the pid file after the sigterm handler
1870: * is setup and the listen sockets are bound
1871: */
1.1.1.11 christos 1872: if (options.pid_file != NULL && !debug_flag) {
1.1 christos 1873: FILE *f = fopen(options.pid_file, "w");
1874:
1875: if (f == NULL) {
1876: error("Couldn't create pid file \"%s\": %s",
1877: options.pid_file, strerror(errno));
1878: } else {
1879: fprintf(f, "%ld\n", (long) getpid());
1880: fclose(f);
1881: }
1882: }
1883:
1884: /* Accept a connection and return in a forked child */
1885: server_accept_loop(&sock_in, &sock_out,
1886: &newsock, config_s);
1887: }
1888:
1889: /* This is the child processing a new connection. */
1890: setproctitle("%s", "[accepted]");
1891:
1892: /*
1893: * Create a new session and process group since the 4.4BSD
1894: * setlogin() affects the entire process group. We don't
1895: * want the child to be able to affect the parent.
1896: */
1.1.1.23 christos 1897: if (!debug_flag && !inetd_flag && setsid() == -1)
1.1 christos 1898: error("setsid: %.100s", strerror(errno));
1899:
1900: if (rexec_flag) {
1901: int fd;
1902:
1903: debug("rexec start in %d out %d newsock %d pipe %d sock %d",
1904: sock_in, sock_out, newsock, startup_pipe, config_s[0]);
1905: dup2(newsock, STDIN_FILENO);
1906: dup2(STDIN_FILENO, STDOUT_FILENO);
1907: if (startup_pipe == -1)
1908: close(REEXEC_STARTUP_PIPE_FD);
1.1.1.10 christos 1909: else if (startup_pipe != REEXEC_STARTUP_PIPE_FD) {
1.1 christos 1910: dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD);
1.1.1.10 christos 1911: close(startup_pipe);
1912: startup_pipe = REEXEC_STARTUP_PIPE_FD;
1913: }
1.1 christos 1914:
1915: dup2(config_s[1], REEXEC_CONFIG_PASS_FD);
1916: close(config_s[1]);
1917:
1918: execv(rexec_argv[0], rexec_argv);
1919:
1920: /* Reexec has failed, fall back and continue */
1921: error("rexec of %s failed: %s", rexec_argv[0], strerror(errno));
1922: recv_rexec_state(REEXEC_CONFIG_PASS_FD, NULL);
1923: log_init(__progname, options.log_level,
1924: options.log_facility, log_stderr);
1925:
1926: /* Clean up fds */
1927: close(REEXEC_CONFIG_PASS_FD);
1928: newsock = sock_out = sock_in = dup(STDIN_FILENO);
1929: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1930: dup2(fd, STDIN_FILENO);
1931: dup2(fd, STDOUT_FILENO);
1932: if (fd > STDERR_FILENO)
1933: close(fd);
1934: }
1935: debug("rexec cleanup in %d out %d newsock %d pipe %d sock %d",
1936: sock_in, sock_out, newsock, startup_pipe, config_s[0]);
1937: }
1938:
1.1.1.3 adam 1939: /* Executed child processes don't need these. */
1940: fcntl(sock_out, F_SETFD, FD_CLOEXEC);
1941: fcntl(sock_in, F_SETFD, FD_CLOEXEC);
1942:
1.1.1.25! christos 1943: /* We will not restart on SIGHUP since it no longer makes sense. */
1.1.1.24 christos 1944: ssh_signal(SIGALRM, SIG_DFL);
1945: ssh_signal(SIGHUP, SIG_DFL);
1946: ssh_signal(SIGTERM, SIG_DFL);
1947: ssh_signal(SIGQUIT, SIG_DFL);
1948: ssh_signal(SIGCHLD, SIG_DFL);
1.1 christos 1949:
1950: /*
1951: * Register our connection. This turns encryption off because we do
1952: * not have a key.
1953: */
1.1.1.22 christos 1954: if ((ssh = ssh_packet_set_connection(NULL, sock_in, sock_out)) == NULL)
1955: fatal("Unable to create connection");
1956: the_active_state = ssh;
1957: ssh_packet_set_server(ssh);
1.1.1.19 christos 1958:
1.1.1.16 christos 1959: check_ip_options(ssh);
1.1 christos 1960:
1.1.1.19 christos 1961: /* Prepare the channels layer */
1962: channel_init_channels(ssh);
1963: channel_set_af(ssh, options.address_family);
1964: process_permitopen(ssh, &options);
1965:
1.1 christos 1966: /* Set SO_KEEPALIVE if requested. */
1.1.1.22 christos 1967: if (options.tcp_keep_alive && ssh_packet_connection_is_on_socket(ssh) &&
1.1.1.23 christos 1968: setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) == -1)
1.1 christos 1969: error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
1970:
1.1.1.16 christos 1971: if ((remote_port = ssh_remote_port(ssh)) < 0) {
1972: debug("ssh_remote_port failed");
1.1 christos 1973: cleanup_exit(255);
1974: }
1975:
1976: /*
1977: * The rest of the code depends on the fact that
1.1.1.16 christos 1978: * ssh_remote_ipaddr() caches the remote ip, even if
1.1 christos 1979: * the socket goes away.
1980: */
1.1.1.16 christos 1981: remote_ip = ssh_remote_ipaddr(ssh);
1.1 christos 1982:
1.1.1.20 christos 1983: rdomain = ssh_packet_rdomain_in(ssh);
1984:
1.1 christos 1985: /* Log the connection. */
1.1.1.12 christos 1986: laddr = get_local_ipaddr(sock_in);
1.1.1.20 christos 1987: verbose("Connection from %s port %d on %s port %d%s%s%s",
1988: remote_ip, remote_port, laddr, ssh_local_port(ssh),
1989: rdomain == NULL ? "" : " rdomain \"",
1990: rdomain == NULL ? "" : rdomain,
1991: rdomain == NULL ? "" : "\"");
1.1.1.12 christos 1992: free(laddr);
1.1 christos 1993:
1994: /*
1995: * We don't want to listen forever unless the other side
1996: * successfully authenticates itself. So we set up an alarm which is
1997: * cleared after successful authentication. A limit of zero
1998: * indicates no limit. Note that we don't set the alarm in debugging
1999: * mode; it is just annoying to have the server exit just when you
2000: * are about to discover the bug.
2001: */
1.1.1.24 christos 2002: ssh_signal(SIGALRM, grace_alarm_handler);
1.1 christos 2003: if (!debug_flag)
2004: alarm(options.login_grace_time);
2005:
1.1.1.25! christos 2006: if ((r = kex_exchange_identification(ssh, -1,
! 2007: options.version_addendum)) != 0)
! 2008: sshpkt_fatal(ssh, r, "banner exchange");
1.1.1.22 christos 2009:
2010: ssh_packet_set_nonblocking(ssh);
1.1 christos 2011:
2012: /* allocate authentication context */
2013: authctxt = xcalloc(1, sizeof(*authctxt));
1.1.1.22 christos 2014: ssh->authctxt = authctxt;
1.1 christos 2015:
2016: /* XXX global for cleanup, access from other modules */
2017: the_authctxt = authctxt;
2018:
1.1.1.20 christos 2019: /* Set default key authentication options */
2020: if ((auth_opts = sshauthopt_new_with_keys_defaults()) == NULL)
2021: fatal("allocation failed");
2022:
1.1 christos 2023: /* prepare buffer to collect messages to display to user after login */
1.1.1.21 christos 2024: if ((loginmsg = sshbuf_new()) == NULL)
2025: fatal("%s: sshbuf_new failed", __func__);
1.1.1.3 adam 2026: auth_debug_reset();
1.1 christos 2027:
1.1.1.9 christos 2028: if (use_privsep) {
1.1.1.22 christos 2029: if (privsep_preauth(ssh) == 1)
1.1 christos 2030: goto authenticated;
1.1.1.17 christos 2031: } else if (have_agent) {
1.1.1.11 christos 2032: if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) {
2033: error("Unable to get agent socket: %s", ssh_err(r));
2034: have_agent = 0;
2035: }
2036: }
1.1 christos 2037:
2038: /* perform the key exchange */
2039: /* authenticate user and start session */
1.1.1.22 christos 2040: do_ssh2_kex(ssh);
2041: do_authentication2(ssh);
1.1.1.17 christos 2042:
1.1 christos 2043: /*
2044: * If we use privilege separation, the unprivileged child transfers
2045: * the current keystate and exits
2046: */
2047: if (use_privsep) {
1.1.1.22 christos 2048: mm_send_keystate(ssh, pmonitor);
2049: ssh_packet_clear_keys(ssh);
1.1 christos 2050: exit(0);
2051: }
2052:
2053: authenticated:
2054: /*
2055: * Cancel the alarm we set to limit the time taken for
2056: * authentication.
2057: */
2058: alarm(0);
1.1.1.24 christos 2059: ssh_signal(SIGALRM, SIG_DFL);
1.1 christos 2060: authctxt->authenticated = 1;
2061: if (startup_pipe != -1) {
2062: close(startup_pipe);
2063: startup_pipe = -1;
2064: }
2065:
1.1.1.20 christos 2066: if (options.routing_domain != NULL)
2067: set_process_rdomain(ssh, options.routing_domain);
2068:
1.1 christos 2069: /*
2070: * In privilege separation, we fork another child and prepare
2071: * file descriptor passing.
2072: */
2073: if (use_privsep) {
1.1.1.22 christos 2074: privsep_postauth(ssh, authctxt);
1.1 christos 2075: /* the monitor process [priv] will not return */
2076: }
2077:
1.1.1.22 christos 2078: ssh_packet_set_timeout(ssh, options.client_alive_interval,
1.1 christos 2079: options.client_alive_count_max);
2080:
1.1.1.11 christos 2081: /* Try to send all our hostkeys to the client */
1.1.1.19 christos 2082: notify_hostkeys(ssh);
1.1.1.11 christos 2083:
1.1 christos 2084: /* Start session. */
1.1.1.19 christos 2085: do_authenticated(ssh, authctxt);
1.1 christos 2086:
2087: /* The connection has been terminated. */
1.1.1.22 christos 2088: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.1.1.4 christos 2089: verbose("Transferred: sent %llu, received %llu bytes",
2090: (unsigned long long)obytes, (unsigned long long)ibytes);
1.1 christos 2091:
2092: verbose("Closing connection to %.500s port %d", remote_ip, remote_port);
1.1.1.22 christos 2093: ssh_packet_close(ssh);
1.1 christos 2094:
2095: if (use_privsep)
2096: mm_terminate();
2097:
2098: exit(0);
2099: }
2100:
1.1.1.11 christos 2101: int
1.1.1.22 christos 2102: sshd_hostkey_sign(struct ssh *ssh, struct sshkey *privkey,
2103: struct sshkey *pubkey, u_char **signature, size_t *slenp,
2104: const u_char *data, size_t dlen, const char *alg)
1.1.1.9 christos 2105: {
1.1.1.11 christos 2106: int r;
2107:
1.1.1.22 christos 2108: if (use_privsep) {
2109: if (privkey) {
2110: if (mm_sshkey_sign(ssh, privkey, signature, slenp,
1.1.1.24 christos 2111: data, dlen, alg, options.sk_provider,
2112: ssh->compat) < 0)
1.1.1.22 christos 2113: fatal("%s: privkey sign failed", __func__);
2114: } else {
2115: if (mm_sshkey_sign(ssh, pubkey, signature, slenp,
1.1.1.24 christos 2116: data, dlen, alg, options.sk_provider,
2117: ssh->compat) < 0)
1.1.1.22 christos 2118: fatal("%s: pubkey sign failed", __func__);
2119: }
1.1.1.9 christos 2120: } else {
1.1.1.22 christos 2121: if (privkey) {
2122: if (sshkey_sign(privkey, signature, slenp, data, dlen,
1.1.1.24 christos 2123: alg, options.sk_provider, ssh->compat) < 0)
1.1.1.22 christos 2124: fatal("%s: privkey sign failed", __func__);
2125: } else {
2126: if ((r = ssh_agent_sign(auth_sock, pubkey,
2127: signature, slenp, data, dlen, alg,
2128: ssh->compat)) != 0) {
2129: fatal("%s: agent sign failed: %s",
2130: __func__, ssh_err(r));
2131: }
2132: }
1.1.1.9 christos 2133: }
1.1.1.11 christos 2134: return 0;
1.1.1.9 christos 2135: }
2136:
1.1.1.13 christos 2137: /* SSH2 key exchange */
1.1 christos 2138: static void
1.1.1.22 christos 2139: do_ssh2_kex(struct ssh *ssh)
1.1 christos 2140: {
1.1.1.10 christos 2141: char *myproposal[PROPOSAL_MAX] = { KEX_SERVER };
1.1.1.11 christos 2142: struct kex *kex;
2143: int r;
1.1 christos 2144:
1.1.1.13 christos 2145: myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(
2146: options.kex_algorithms);
2147: myproposal[PROPOSAL_ENC_ALGS_CTOS] = compat_cipher_proposal(
2148: options.ciphers);
2149: myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal(
2150: options.ciphers);
2151: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
2152: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
2153:
1.1 christos 2154: if (options.compression == COMP_NONE) {
2155: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
1.1.1.16 christos 2156: myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
1.1 christos 2157: }
1.1.1.10 christos 2158:
1.1.1.9 christos 2159: if (options.rekey_limit || options.rekey_interval)
1.1.1.22 christos 2160: ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
1.1.1.18 christos 2161: options.rekey_interval);
1.1.1.9 christos 2162:
1.1.1.10 christos 2163: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal(
2164: list_hostkey_types());
1.1 christos 2165:
2166: /* start key exchange */
1.1.1.22 christos 2167: if ((r = kex_setup(ssh, myproposal)) != 0)
1.1.1.11 christos 2168: fatal("kex_setup: %s", ssh_err(r));
1.1.1.22 christos 2169: kex = ssh->kex;
1.1.1.10 christos 2170: #ifdef WITH_OPENSSL
1.1.1.22 christos 2171: kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_server;
2172: kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_server;
2173: kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_server;
2174: kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_server;
2175: kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_server;
1.1 christos 2176: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
2177: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1.1.1.22 christos 2178: kex->kex[KEX_ECDH_SHA2] = kex_gen_server;
1.1.1.10 christos 2179: #endif
1.1.1.22 christos 2180: kex->kex[KEX_C25519_SHA256] = kex_gen_server;
2181: kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_server;
1.1.1.3 adam 2182: kex->load_host_public_key=&get_hostkey_public_by_type;
2183: kex->load_host_private_key=&get_hostkey_private_by_type;
1.1 christos 2184: kex->host_key_index=&get_hostkey_index;
1.1.1.9 christos 2185: kex->sign = sshd_hostkey_sign;
1.1 christos 2186:
1.1.1.22 christos 2187: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &kex->done);
1.1 christos 2188:
2189: session_id2 = kex->session_id;
2190: session_id2_len = kex->session_id_len;
2191:
2192: #ifdef DEBUG_KEXDH
2193: /* send 1st encrypted/maced/compressed message */
2194: packet_start(SSH2_MSG_IGNORE);
2195: packet_put_cstring("markus");
2196: packet_send();
2197: packet_write_wait();
2198: #endif
2199: debug("KEX done");
2200: }
2201:
2202: /* server specific fatal cleanup */
2203: void
2204: cleanup_exit(int i)
2205: {
1.1.1.22 christos 2206: if (the_active_state != NULL && the_authctxt != NULL) {
2207: do_cleanup(the_active_state, the_authctxt);
1.1.1.10 christos 2208: if (use_privsep && privsep_is_preauth &&
2209: pmonitor != NULL && pmonitor->m_pid > 1) {
1.1.1.6 christos 2210: debug("Killing privsep child %d", pmonitor->m_pid);
2211: if (kill(pmonitor->m_pid, SIGKILL) != 0 &&
2212: errno != ESRCH)
2213: error("%s: kill(%d): %s", __func__,
2214: pmonitor->m_pid, strerror(errno));
2215: }
2216: }
1.1 christos 2217: _exit(i);
2218: }
CVSweb <webmaster@jp.NetBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to sshd.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [cvs.NetBSD.org] / src / crypto / external / bsd / openssh / dist