Annotation of src/usr.bin/ssh/sshd.c, Revision 1.554
1.554 ! markus 1: /* $OpenBSD: sshd.c,v 1.553 2020/05/08 05:13:14 djm 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:
1.546 djm 235: /* Included files from the configuration file */
236: struct include_list includes = TAILQ_HEAD_INITIALIZER(includes);
237:
1.299 dtucker 238: /* message to be displayed after login */
1.510 markus 239: struct sshbuf *loginmsg;
1.299 dtucker 240:
1.1 deraadt 241: /* Prototypes for various functions defined later in this file. */
1.200 itojun 242: void destroy_sensitive_data(void);
1.231 provos 243: void demote_sensitive_data(void);
1.525 djm 244: static void do_ssh2_kex(struct ssh *);
1.129 provos 245:
1.545 djm 246: static char *listener_proctitle;
247:
1.87 markus 248: /*
1.75 markus 249: * Close all listening sockets
250: */
1.200 itojun 251: static void
1.75 markus 252: close_listen_socks(void)
253: {
254: int i;
1.250 deraadt 255:
1.75 markus 256: for (i = 0; i < num_listen_socks; i++)
257: close(listen_socks[i]);
258: num_listen_socks = -1;
259: }
260:
1.211 markus 261: static void
262: close_startup_pipes(void)
263: {
264: int i;
1.250 deraadt 265:
1.211 markus 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:
1.75 markus 272: /*
1.65 deraadt 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: */
1.327 deraadt 277:
278: /*ARGSUSED*/
1.200 itojun 279: static void
1.64 markus 280: sighup_handler(int sig)
1.1 deraadt 281: {
1.64 markus 282: received_sighup = 1;
1.1 deraadt 283: }
284:
1.65 deraadt 285: /*
286: * Called from the main program after receiving SIGHUP.
287: * Restarts the server.
288: */
1.200 itojun 289: static void
1.165 itojun 290: sighup_restart(void)
1.1 deraadt 291: {
1.264 itojun 292: logit("Received SIGHUP; restarting.");
1.479 dtucker 293: if (options.pid_file != NULL)
294: unlink(options.pid_file);
1.75 markus 295: close_listen_socks();
1.211 markus 296: close_startup_pipes();
1.544 dtucker 297: ssh_signal(SIGHUP, SIG_IGN); /* will be restored after exec */
1.64 markus 298: execv(saved_argv[0], saved_argv);
1.264 itojun 299: logit("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0],
1.250 deraadt 300: strerror(errno));
1.64 markus 301: exit(1);
1.1 deraadt 302: }
303:
1.65 deraadt 304: /*
305: * Generic signal handler for terminating signals in the master daemon.
306: */
1.327 deraadt 307: /*ARGSUSED*/
1.200 itojun 308: static void
1.64 markus 309: sigterm_handler(int sig)
1.1 deraadt 310: {
1.199 markus 311: received_sigterm = sig;
1.1 deraadt 312: }
313:
1.65 deraadt 314: /*
315: * SIGCHLD handler. This is called whenever a child dies. This will then
1.199 markus 316: * reap any zombies left by exited children.
1.65 deraadt 317: */
1.327 deraadt 318: /*ARGSUSED*/
1.200 itojun 319: static void
1.64 markus 320: main_sigchld_handler(int sig)
1.1 deraadt 321: {
1.250 deraadt 322: int save_errno = errno;
1.239 markus 323: pid_t pid;
1.64 markus 324: int status;
1.60 deraadt 325:
1.544 dtucker 326: debug("main_sigchld_handler: %s", strsignal(sig));
327:
1.239 markus 328: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1.537 deraadt 329: (pid == -1 && errno == EINTR))
1.64 markus 330: ;
331: errno = save_errno;
1.1 deraadt 332: }
333:
1.65 deraadt 334: /*
335: * Signal handler for the alarm after the login grace period has expired.
336: */
1.327 deraadt 337: /*ARGSUSED*/
1.200 itojun 338: static void
1.64 markus 339: grace_alarm_handler(int sig)
1.1 deraadt 340: {
1.285 dtucker 341: if (use_privsep && pmonitor != NULL && pmonitor->m_pid > 0)
342: kill(pmonitor->m_pid, SIGALRM);
1.394 djm 343:
344: /*
345: * Try to kill any processes that we have spawned, E.g. authorized
346: * keys command helpers.
347: */
348: if (getpgid(0) == getpid()) {
1.544 dtucker 349: ssh_signal(SIGTERM, SIG_IGN);
1.416 djm 350: kill(0, SIGTERM);
1.394 djm 351: }
1.285 dtucker 352:
1.527 djm 353: /* XXX pre-format ipaddr/port so we don't need to access active_state */
1.64 markus 354: /* Log error and exit. */
1.466 djm 355: sigdie("Timeout before authentication for %s port %d",
1.527 djm 356: ssh_remote_ipaddr(the_active_state),
357: ssh_remote_port(the_active_state));
1.62 markus 358: }
359:
1.134 markus 360: /* Destroy the host and server keys. They will no longer be needed. */
1.108 markus 361: void
362: destroy_sensitive_data(void)
363: {
1.493 djm 364: u_int i;
1.134 markus 365:
1.217 deraadt 366: for (i = 0; i < options.num_host_key_files; i++) {
1.134 markus 367: if (sensitive_data.host_keys[i]) {
1.512 markus 368: sshkey_free(sensitive_data.host_keys[i]);
1.134 markus 369: sensitive_data.host_keys[i] = NULL;
370: }
1.373 djm 371: if (sensitive_data.host_certificates[i]) {
1.512 markus 372: sshkey_free(sensitive_data.host_certificates[i]);
1.373 djm 373: sensitive_data.host_certificates[i] = NULL;
374: }
1.134 markus 375: }
376: }
377:
1.231 provos 378: /* Demote private to public keys for network child */
379: void
380: demote_sensitive_data(void)
381: {
1.488 markus 382: struct sshkey *tmp;
1.493 djm 383: u_int i;
1.512 markus 384: int r;
1.231 provos 385:
386: for (i = 0; i < options.num_host_key_files; i++) {
387: if (sensitive_data.host_keys[i]) {
1.515 djm 388: if ((r = sshkey_from_private(
389: sensitive_data.host_keys[i], &tmp)) != 0)
1.512 markus 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]);
1.231 provos 394: sensitive_data.host_keys[i] = tmp;
395: }
1.373 djm 396: /* Certs do not need demotion */
1.231 provos 397: }
398: }
399:
1.233 markus 400: static void
1.231 provos 401: privsep_preauth_child(void)
402: {
1.253 deraadt 403: gid_t gidset[1];
1.250 deraadt 404: struct passwd *pw;
1.231 provos 405:
406: /* Enable challenge-response authentication for privilege separation */
407: privsep_challenge_enable();
1.419 djm 408:
1.420 markus 409: #ifdef GSSAPI
1.419 djm 410: /* Cache supported mechanism OIDs for later use */
1.516 djm 411: ssh_gssapi_prepare_supported_oids();
1.420 markus 412: #endif
1.231 provos 413:
414: /* Demote the private keys to public keys. */
415: demote_sensitive_data();
416:
1.460 djm 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);
1.500 djm 422: pw = pwcopy(pw); /* Ensure mutable */
1.460 djm 423: endpwent();
1.500 djm 424: freezero(pw->pw_passwd, strlen(pw->pw_passwd));
1.460 djm 425:
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;
1.537 deraadt 440: if (setgroups(1, gidset) == -1)
1.460 djm 441: fatal("setgroups: %.100s", strerror(errno));
442: permanently_set_uid(pw);
443: }
1.231 provos 444: }
445:
1.278 markus 446: static int
1.525 djm 447: privsep_preauth(struct ssh *ssh)
1.237 markus 448: {
1.432 djm 449: int status, r;
1.237 markus 450: pid_t pid;
1.384 djm 451: struct ssh_sandbox *box = NULL;
1.237 markus 452:
453: /* Set up unprivileged child process to deal with network data */
1.242 mouring 454: pmonitor = monitor_init();
1.237 markus 455: /* Store a pointer to the kex for later rekeying */
1.525 djm 456: pmonitor->m_pkex = &ssh->kex;
1.237 markus 457:
1.393 djm 458: if (use_privsep == PRIVSEP_ON)
1.384 djm 459: box = ssh_sandbox_init();
1.237 markus 460: pid = fork();
461: if (pid == -1) {
462: fatal("fork of unprivileged child failed");
463: } else if (pid != 0) {
1.245 mpech 464: debug2("Network child is on pid %ld", (long)pid);
1.237 markus 465:
1.392 markus 466: pmonitor->m_pid = pid;
1.432 djm 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: }
1.384 djm 475: if (box != NULL)
476: ssh_sandbox_parent_preauth(box, pid);
1.526 djm 477: monitor_child_preauth(ssh, pmonitor);
1.237 markus 478:
479: /* Wait for the child's exit status */
1.537 deraadt 480: while (waitpid(pid, &status, 0) == -1) {
1.386 djm 481: if (errno == EINTR)
482: continue;
483: pmonitor->m_pid = -1;
484: fatal("%s: waitpid: %s", __func__, strerror(errno));
1.384 djm 485: }
1.386 djm 486: privsep_is_preauth = 0;
487: pmonitor->m_pid = -1;
1.384 djm 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;
1.237 markus 498: } else {
499: /* child */
1.383 djm 500: close(pmonitor->m_sendfd);
501: close(pmonitor->m_log_recvfd);
1.237 markus 502:
1.383 djm 503: /* Arrange for logging to be sent to the monitor */
504: set_log_handler(mm_log_handler, pmonitor);
1.237 markus 505:
1.460 djm 506: privsep_preauth_child();
1.238 stevesk 507: setproctitle("%s", "[net]");
1.384 djm 508: if (box != NULL)
509: ssh_sandbox_child(box);
510:
511: return 0;
1.237 markus 512: }
513: }
514:
1.233 markus 515: static void
1.525 djm 516: privsep_postauth(struct ssh *ssh, Authctxt *authctxt)
1.231 provos 517: {
1.474 djm 518: if (authctxt->pw->pw_uid == 0) {
1.231 provos 519: /* File descriptor passing is broken or root login */
520: use_privsep = 0;
1.315 djm 521: goto skip;
1.231 provos 522: }
1.234 markus 523:
1.231 provos 524: /* New socket pair */
1.242 mouring 525: monitor_reinit(pmonitor);
1.231 provos 526:
1.242 mouring 527: pmonitor->m_pid = fork();
528: if (pmonitor->m_pid == -1)
1.231 provos 529: fatal("fork of unprivileged child failed");
1.242 mouring 530: else if (pmonitor->m_pid != 0) {
1.364 markus 531: verbose("User child is on pid %ld", (long)pmonitor->m_pid);
1.510 markus 532: sshbuf_reset(loginmsg);
1.526 djm 533: monitor_clear_keystate(ssh, pmonitor);
534: monitor_child_postauth(ssh, pmonitor);
1.231 provos 535:
536: /* NEVERREACHED */
537: exit(0);
538: }
539:
1.383 djm 540: /* child */
541:
1.242 mouring 542: close(pmonitor->m_sendfd);
1.383 djm 543: pmonitor->m_sendfd = -1;
1.231 provos 544:
545: /* Demote the private keys to public keys. */
546: demote_sensitive_data();
1.354 djm 547:
1.231 provos 548: /* Drop privileges */
549: do_setusercontext(authctxt->pw);
550:
1.315 djm 551: skip:
1.231 provos 552: /* It is safe now to apply the key state */
1.526 djm 553: monitor_apply_keystate(ssh, pmonitor);
1.312 markus 554:
555: /*
556: * Tell the packet layer that authentication was successful, since
557: * this information is not part of the key state.
558: */
1.525 djm 559: ssh_packet_set_authenticated(ssh);
1.231 provos 560: }
561:
1.509 djm 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:
1.200 itojun 576: static char *
1.134 markus 577: list_hostkey_types(void)
578: {
1.509 djm 579: struct sshbuf *b;
580: struct sshkey *key;
1.281 jakob 581: char *ret;
1.493 djm 582: u_int i;
1.223 markus 583:
1.509 djm 584: if ((b = sshbuf_new()) == NULL)
585: fatal("%s: sshbuf_new failed", __func__);
1.217 deraadt 586: for (i = 0; i < options.num_host_key_files; i++) {
1.373 djm 587: key = sensitive_data.host_keys[i];
1.443 djm 588: if (key == NULL)
1.404 markus 589: key = sensitive_data.host_pubkeys[i];
1.472 markus 590: if (key == NULL)
1.134 markus 591: continue;
1.214 deraadt 592: switch (key->type) {
1.134 markus 593: case KEY_RSA:
1.509 djm 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 */
1.134 markus 598: case KEY_DSA:
1.378 djm 599: case KEY_ECDSA:
1.412 markus 600: case KEY_ED25519:
1.542 djm 601: case KEY_ECDSA_SK:
602: case KEY_ED25519_SK:
1.505 markus 603: case KEY_XMSS:
1.509 djm 604: append_hostkey_type(b, sshkey_ssh_name(key));
1.134 markus 605: break;
606: }
1.373 djm 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:
1.509 djm 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 */
1.373 djm 619: case KEY_DSA_CERT:
1.378 djm 620: case KEY_ECDSA_CERT:
1.412 markus 621: case KEY_ED25519_CERT:
1.542 djm 622: case KEY_ECDSA_SK_CERT:
623: case KEY_ED25519_SK_CERT:
1.505 markus 624: case KEY_XMSS_CERT:
1.509 djm 625: append_hostkey_type(b, sshkey_ssh_name(key));
1.373 djm 626: break;
627: }
1.134 markus 628: }
1.509 djm 629: if ((ret = sshbuf_dup_string(b)) == NULL)
1.467 djm 630: fatal("%s: sshbuf_dup_string failed", __func__);
1.509 djm 631: sshbuf_free(b);
632: debug("%s: %s", __func__, ret);
1.281 jakob 633: return ret;
1.134 markus 634: }
635:
1.488 markus 636: static struct sshkey *
1.440 djm 637: get_hostkey_by_type(int type, int nid, int need_private, struct ssh *ssh)
1.134 markus 638: {
1.493 djm 639: u_int i;
1.488 markus 640: struct sshkey *key;
1.250 deraadt 641:
1.217 deraadt 642: for (i = 0; i < options.num_host_key_files; i++) {
1.375 djm 643: switch (type) {
644: case KEY_RSA_CERT:
645: case KEY_DSA_CERT:
1.378 djm 646: case KEY_ECDSA_CERT:
1.412 markus 647: case KEY_ED25519_CERT:
1.542 djm 648: case KEY_ECDSA_SK_CERT:
649: case KEY_ED25519_SK_CERT:
1.505 markus 650: case KEY_XMSS_CERT:
1.373 djm 651: key = sensitive_data.host_certificates[i];
1.375 djm 652: break;
653: default:
1.373 djm 654: key = sensitive_data.host_keys[i];
1.404 markus 655: if (key == NULL && !need_private)
656: key = sensitive_data.host_pubkeys[i];
1.375 djm 657: break;
658: }
1.542 djm 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:
1.373 djm 670: return need_private ?
671: sensitive_data.host_keys[i] : key;
1.542 djm 672: }
1.134 markus 673: }
674: return NULL;
1.96 markus 675: }
676:
1.488 markus 677: struct sshkey *
1.440 djm 678: get_hostkey_public_by_type(int type, int nid, struct ssh *ssh)
1.373 djm 679: {
1.440 djm 680: return get_hostkey_by_type(type, nid, 0, ssh);
1.373 djm 681: }
682:
1.488 markus 683: struct sshkey *
1.440 djm 684: get_hostkey_private_by_type(int type, int nid, struct ssh *ssh)
1.373 djm 685: {
1.440 djm 686: return get_hostkey_by_type(type, nid, 1, ssh);
1.373 djm 687: }
688:
1.488 markus 689: struct sshkey *
1.231 provos 690: get_hostkey_by_index(int ind)
691: {
1.493 djm 692: if (ind < 0 || (u_int)ind >= options.num_host_key_files)
1.231 provos 693: return (NULL);
694: return (sensitive_data.host_keys[ind]);
695: }
696:
1.488 markus 697: struct sshkey *
1.435 markus 698: get_hostkey_public_by_index(int ind, struct ssh *ssh)
1.404 markus 699: {
1.493 djm 700: if (ind < 0 || (u_int)ind >= options.num_host_key_files)
1.404 markus 701: return (NULL);
702: return (sensitive_data.host_pubkeys[ind]);
703: }
704:
1.231 provos 705: int
1.488 markus 706: get_hostkey_index(struct sshkey *key, int compare, struct ssh *ssh)
1.231 provos 707: {
1.493 djm 708: u_int i;
1.250 deraadt 709:
1.231 provos 710: for (i = 0; i < options.num_host_key_files; i++) {
1.512 markus 711: if (sshkey_is_cert(key)) {
1.442 djm 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])))
1.373 djm 716: return (i);
717: } else {
1.442 djm 718: if (key == sensitive_data.host_keys[i] ||
719: (compare && sensitive_data.host_keys[i] &&
720: sshkey_equal(key, sensitive_data.host_keys[i])))
1.373 djm 721: return (i);
1.442 djm 722: if (key == sensitive_data.host_pubkeys[i] ||
723: (compare && sensitive_data.host_pubkeys[i] &&
724: sshkey_equal(key, sensitive_data.host_pubkeys[i])))
1.404 markus 725: return (i);
1.373 djm 726: }
1.231 provos 727: }
728: return (-1);
729: }
730:
1.439 djm 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;
1.493 djm 737: u_int i, nkeys;
738: int r;
1.439 djm 739: char *fp;
1.446 dtucker 740:
741: /* Some clients cannot cope with the hostkeys message, skip those. */
1.527 djm 742: if (ssh->compat & SSH_BUG_HOSTKEYS)
1.446 dtucker 743: return;
1.439 djm 744:
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 ||
1.472 markus 750: sshkey_is_cert(key))
1.439 djm 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);
1.442 djm 757: if (nkeys == 0) {
1.525 djm 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__);
1.442 djm 766: }
1.525 djm 767: /* Append the key to the request */
1.442 djm 768: sshbuf_reset(buf);
769: if ((r = sshkey_putb(key, buf)) != 0)
1.439 djm 770: fatal("%s: couldn't put hostkey %d: %s",
771: __func__, i, ssh_err(r));
1.525 djm 772: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
773: sshpkt_fatal(ssh, r, "%s: append key", __func__);
1.439 djm 774: nkeys++;
775: }
1.493 djm 776: debug3("%s: sent %u hostkeys", __func__, nkeys);
1.439 djm 777: if (nkeys == 0)
778: fatal("%s: no hostkeys", __func__);
1.525 djm 779: if ((r = sshpkt_send(ssh)) != 0)
780: sshpkt_fatal(ssh, r, "%s: send", __func__);
1.442 djm 781: sshbuf_free(buf);
1.439 djm 782: }
783:
1.124 markus 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: */
1.200 itojun 790: static int
1.124 markus 791: drop_connection(int startups)
792: {
1.303 mickey 793: int p, r;
1.124 markus 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;
1.303 mickey 804: p /= options.max_startups - options.max_startups_begin;
1.124 markus 805: p += options.max_startups_rate;
1.356 djm 806: r = arc4random_uniform(100);
1.124 markus 807:
1.304 djm 808: debug("drop_connection: p %d, r %d", p, r);
1.124 markus 809: return (r < p) ? 1 : 0;
810: }
811:
1.215 markus 812: static void
813: usage(void)
814: {
1.290 markus 815: fprintf(stderr, "%s, %s\n",
1.426 markus 816: SSH_VERSION,
817: #ifdef WITH_OPENSSL
1.517 djm 818: OpenSSL_version(OPENSSL_VERSION)
1.426 markus 819: #else
820: "without OpenSSL"
821: #endif
822: );
1.289 markus 823: fprintf(stderr,
1.473 naddy 824: "usage: sshd [-46DdeiqTt] [-C connection_spec] [-c host_cert_file]\n"
1.399 dtucker 825: " [-E log_file] [-f config_file] [-g login_grace_time]\n"
1.473 naddy 826: " [-h host_key_file] [-o option] [-p port] [-u len]\n"
1.289 markus 827: );
1.215 markus 828: exit(1);
829: }
830:
1.294 djm 831: static void
1.467 djm 832: send_rexec_state(int fd, struct sshbuf *conf)
1.294 djm 833: {
1.546 djm 834: struct sshbuf *m = NULL, *inc = NULL;
835: struct include_item *item = NULL;
1.467 djm 836: int r;
1.294 djm 837:
1.467 djm 838: debug3("%s: entering fd = %d config len %zu", __func__, fd,
839: sshbuf_len(conf));
1.294 djm 840:
1.546 djm 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 ||
1.547 djm 848: (r = sshbuf_put_stringb(inc, item->contents)) != 0)
1.546 djm 849: fatal("%s: buffer error: %s", __func__, ssh_err(r));
850: }
851:
1.294 djm 852: /*
853: * Protocol from reexec master to child:
854: * string configuration
1.546 djm 855: * string included_files[] {
856: * string selector
857: * string filename
858: * string contents
859: * }
1.294 djm 860: */
1.546 djm 861: if ((r = sshbuf_put_stringb(m, conf)) != 0 ||
862: (r = sshbuf_put_stringb(m, inc)) != 0)
1.467 djm 863: fatal("%s: buffer error: %s", __func__, ssh_err(r));
864: if (ssh_msg_send(fd, 0, m) == -1)
1.294 djm 865: fatal("%s: ssh_msg_send failed", __func__);
866:
1.467 djm 867: sshbuf_free(m);
1.546 djm 868: sshbuf_free(inc);
1.294 djm 869:
870: debug3("%s: done", __func__);
871: }
872:
873: static void
1.511 markus 874: recv_rexec_state(int fd, struct sshbuf *conf)
1.294 djm 875: {
1.546 djm 876: struct sshbuf *m, *inc;
1.511 markus 877: u_char *cp, ver;
878: size_t len;
879: int r;
1.546 djm 880: struct include_item *item;
1.294 djm 881:
882: debug3("%s: entering fd = %d", __func__, fd);
883:
1.546 djm 884: if ((m = sshbuf_new()) == NULL || (inc = sshbuf_new()) == NULL)
1.511 markus 885: fatal("%s: sshbuf_new failed", __func__);
886: if (ssh_msg_recv(fd, m) == -1)
1.294 djm 887: fatal("%s: ssh_msg_recv failed", __func__);
1.511 markus 888: if ((r = sshbuf_get_u8(m, &ver)) != 0)
889: fatal("%s: buffer error: %s", __func__, ssh_err(r));
890: if (ver != 0)
1.294 djm 891: fatal("%s: rexec version mismatch", __func__);
1.546 djm 892: if ((r = sshbuf_get_string(m, &cp, &len)) != 0 ||
893: (r = sshbuf_get_stringb(m, inc)) != 0)
1.511 markus 894: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.546 djm 895:
1.511 markus 896: if (conf != NULL && (r = sshbuf_put(conf, cp, len)))
897: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.294 djm 898:
1.546 djm 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:
1.402 djm 910: free(cp);
1.511 markus 911: sshbuf_free(m);
1.294 djm 912:
913: debug3("%s: done", __func__);
914: }
915:
1.345 djm 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);
1.403 dtucker 937: if (!log_stderr)
938: dup2(fd, STDERR_FILENO);
939: if (fd > (log_stderr ? STDERR_FILENO : STDOUT_FILENO))
1.345 djm 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
1.494 djm 949: listen_on_addrs(struct listenaddr *la)
1.345 djm 950: {
1.494 djm 951: int ret, listen_sock;
1.345 djm 952: struct addrinfo *ai;
953: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
954:
1.494 djm 955: for (ai = la->addrs; ai; ai = ai->ai_next) {
1.345 djm 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",
1.352 dtucker 965: ssh_gai_strerror(ret));
1.345 djm 966: continue;
967: }
968: /* Create socket for listening. */
1.370 dtucker 969: listen_sock = socket(ai->ai_family, ai->ai_socktype,
970: ai->ai_protocol);
1.537 deraadt 971: if (listen_sock == -1) {
1.345 djm 972: /* kernel may not support ipv6 */
973: verbose("socket: %.100s", strerror(errno));
974: continue;
975: }
976: if (set_nonblock(listen_sock) == -1) {
1.483 djm 977: close(listen_sock);
978: continue;
979: }
980: if (fcntl(listen_sock, F_SETFD, FD_CLOEXEC) == -1) {
981: verbose("socket: CLOEXEC: %s", strerror(errno));
1.345 djm 982: close(listen_sock);
983: continue;
984: }
1.494 djm 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: }
1.345 djm 992:
993: debug("Bind to port %s on %s.", strport, ntop);
994:
995: /* Bind the socket to the desired port. */
1.537 deraadt 996: if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) == -1) {
1.345 djm 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. */
1.537 deraadt 1006: if (listen(listen_sock, SSH_LISTEN_BACKLOG) == -1)
1.345 djm 1007: fatal("listen on [%s]:%s: %.100s",
1008: ntop, strport, strerror(errno));
1.494 djm 1009: logit("Server listening on %s port %s%s%s.",
1010: ntop, strport,
1011: la->rdomain == NULL ? "" : " rdomain ",
1012: la->rdomain == NULL ? "" : la->rdomain);
1.345 djm 1013: }
1.494 djm 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;
1.345 djm 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;
1.543 djm 1045: int ostartups = -1, startups = 0, listening = 0, lameduck = 0;
1.345 djm 1046: int startup_p[2] = { -1 , -1 };
1.533 djm 1047: char c = 0;
1.345 djm 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];
1.550 djm 1058: /* pipes connected to unauthenticated child sshd processes */
1.345 djm 1059: startup_pipes = xcalloc(options.max_startups, sizeof(int));
1.533 djm 1060: startup_flags = xcalloc(options.max_startups, sizeof(int));
1.345 djm 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 (;;) {
1.543 djm 1069: if (ostartups != startups) {
1.545 djm 1070: setproctitle("%s [listener] %d of %d-%d startups",
1071: listener_proctitle, startups,
1072: options.max_startups_begin, options.max_startups);
1.543 djm 1073: ostartups = startups;
1074: }
1.533 djm 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: }
1.462 mmcc 1084: free(fdset);
1.458 deraadt 1085: fdset = xcalloc(howmany(maxfd + 1, NFDBITS),
1.345 djm 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);
1.537 deraadt 1096: if (ret == -1 && errno != EINTR)
1.345 djm 1097: error("select: %.100s", strerror(errno));
1098: if (received_sigterm) {
1099: logit("Received signal %d; terminating.",
1100: (int) received_sigterm);
1101: close_listen_socks();
1.430 djm 1102: if (options.pid_file != NULL)
1103: unlink(options.pid_file);
1.382 djm 1104: exit(received_sigterm == SIGTERM ? 0 : 255);
1.345 djm 1105: }
1.537 deraadt 1106: if (ret == -1)
1.345 djm 1107: continue;
1108:
1.533 djm 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 */
1.345 djm 1125: close(startup_pipes[i]);
1126: startup_pipes[i] = -1;
1127: startups--;
1.533 djm 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;
1.345 djm 1138: }
1.533 djm 1139: }
1.345 djm 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);
1.537 deraadt 1146: if (*newsock == -1) {
1.398 markus 1147: if (errno != EINTR && errno != EWOULDBLOCK &&
1148: errno != ECONNABORTED)
1.389 djm 1149: error("accept: %.100s",
1150: strerror(errno));
1151: if (errno == EMFILE || errno == ENFILE)
1152: usleep(100 * 1000);
1.345 djm 1153: continue;
1154: }
1155: if (unset_nonblock(*newsock) == -1) {
1156: close(*newsock);
1157: continue;
1158: }
1159: if (drop_connection(startups) == 1) {
1.480 djm 1160: char *laddr = get_local_ipaddr(*newsock);
1161: char *raddr = get_peer_ipaddr(*newsock);
1.540 dtucker 1162: char msg[] = "Exceeded MaxStartups\r\n";
1.480 djm 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);
1.540 dtucker 1170: /* best-effort notification to client */
1171: (void)write(*newsock, msg, strlen(msg));
1.345 djm 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++;
1.533 djm 1196: startup_flags[j] = 1;
1.345 djm 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) {
1.554 ! markus 1219: close(config_s[1]);
1.511 markus 1220: send_rexec_state(config_s[0], cfg);
1.345 djm 1221: close(config_s[0]);
1222: }
1.533 djm 1223: return;
1.345 djm 1224: }
1225:
1226: /*
1227: * Normal production daemon. Fork, and have
1228: * the child process the connection. The
1229: * parent continues listening.
1230: */
1.533 djm 1231: listening++;
1.345 djm 1232: if ((pid = fork()) == 0) {
1233: /*
1234: * Child. Close the listening and
1235: * max_startup sockets. Start using
1236: * the accepted socket. Reinitialize
1237: * logging (since our pid has changed).
1.533 djm 1238: * We return from this function to handle
1.345 djm 1239: * the connection.
1240: */
1241: startup_pipe = startup_p[1];
1242: close_startup_pipes();
1243: close_listen_socks();
1244: *sock_in = *newsock;
1245: *sock_out = *newsock;
1246: log_init(__progname,
1247: options.log_level,
1248: options.log_facility,
1249: log_stderr);
1250: if (rexec_flag)
1251: close(config_s[0]);
1.533 djm 1252: else {
1253: /*
1254: * Signal parent that the preliminaries
1255: * for this child are complete. For the
1256: * re-exec case, this happens after the
1257: * child has received the rexec state
1258: * from the server.
1259: */
1260: (void)atomicio(vwrite, startup_pipe,
1261: "\0", 1);
1262: }
1263: return;
1.345 djm 1264: }
1265:
1266: /* Parent. Stay in the loop. */
1.537 deraadt 1267: if (pid == -1)
1.345 djm 1268: error("fork: %.100s", strerror(errno));
1269: else
1270: debug("Forked child %ld.", (long)pid);
1271:
1272: close(startup_p[1]);
1273:
1274: if (rexec_flag) {
1.554 ! markus 1275: close(config_s[1]);
1.511 markus 1276: send_rexec_state(config_s[0], cfg);
1.345 djm 1277: close(config_s[0]);
1278: }
1279: close(*newsock);
1280: }
1281: }
1282: }
1283:
1.466 djm 1284: /*
1285: * If IP options are supported, make sure there are none (log and
1286: * return an error if any are found). Basically we are worried about
1287: * source routing; it can be used to pretend you are somebody
1288: * (ip-address) you are not. That itself may be "almost acceptable"
1.507 djm 1289: * under certain circumstances, but rhosts authentication is useless
1.466 djm 1290: * if source routing is accepted. Notice also that if we just dropped
1291: * source routing here, the other side could use IP spoofing to do
1292: * rest of the interaction and could still bypass security. So we
1293: * exit here if we detect any IP options.
1294: */
1295: static void
1296: check_ip_options(struct ssh *ssh)
1297: {
1298: int sock_in = ssh_packet_get_connection_in(ssh);
1299: struct sockaddr_storage from;
1300: u_char opts[200];
1.475 djm 1301: socklen_t i, option_size = sizeof(opts), fromlen = sizeof(from);
1.466 djm 1302: char text[sizeof(opts) * 3 + 1];
1303:
1304: memset(&from, 0, sizeof(from));
1305: if (getpeername(sock_in, (struct sockaddr *)&from,
1.537 deraadt 1306: &fromlen) == -1)
1.466 djm 1307: return;
1308: if (from.ss_family != AF_INET)
1309: return;
1310: /* XXX IPv6 options? */
1311:
1312: if (getsockopt(sock_in, IPPROTO_IP, IP_OPTIONS, opts,
1313: &option_size) >= 0 && option_size != 0) {
1314: text[0] = '\0';
1315: for (i = 0; i < option_size; i++)
1316: snprintf(text + i*3, sizeof(text) - i*3,
1317: " %2.2x", opts[i]);
1318: fatal("Connection from %.100s port %d with IP opts: %.800s",
1319: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text);
1320: }
1321: return;
1322: }
1.345 djm 1323:
1.495 djm 1324: /* Set the routing domain for this process */
1325: static void
1326: set_process_rdomain(struct ssh *ssh, const char *name)
1327: {
1328: int rtable, ortable = getrtable();
1329: const char *errstr;
1330:
1331: if (name == NULL)
1332: return; /* default */
1333:
1334: if (strcmp(name, "%D") == 0) {
1335: /* "expands" to routing domain of connection */
1336: if ((name = ssh_packet_rdomain_in(ssh)) == NULL)
1337: return;
1338: }
1339:
1340: rtable = (int)strtonum(name, 0, 255, &errstr);
1341: if (errstr != NULL) /* Shouldn't happen */
1342: fatal("Invalid routing domain \"%s\": %s", name, errstr);
1343: if (rtable != ortable && setrtable(rtable) != 0)
1344: fatal("Unable to set routing domain %d: %s",
1345: rtable, strerror(errno));
1346: debug("%s: set routing domain %d (was %d)", __func__, rtable, ortable);
1347: }
1348:
1.508 dtucker 1349: static void
1350: accumulate_host_timing_secret(struct sshbuf *server_cfg,
1.536 djm 1351: struct sshkey *key)
1.508 dtucker 1352: {
1353: static struct ssh_digest_ctx *ctx;
1354: u_char *hash;
1355: size_t len;
1356: struct sshbuf *buf;
1357: int r;
1358:
1359: if (ctx == NULL && (ctx = ssh_digest_start(SSH_DIGEST_SHA512)) == NULL)
1360: fatal("%s: ssh_digest_start", __func__);
1361: if (key == NULL) { /* finalize */
1362: /* add server config in case we are using agent for host keys */
1363: if (ssh_digest_update(ctx, sshbuf_ptr(server_cfg),
1364: sshbuf_len(server_cfg)) != 0)
1365: fatal("%s: ssh_digest_update", __func__);
1366: len = ssh_digest_bytes(SSH_DIGEST_SHA512);
1367: hash = xmalloc(len);
1368: if (ssh_digest_final(ctx, hash, len) != 0)
1369: fatal("%s: ssh_digest_final", __func__);
1370: options.timing_secret = PEEK_U64(hash);
1371: freezero(hash, len);
1372: ssh_digest_free(ctx);
1373: ctx = NULL;
1374: return;
1375: }
1376: if ((buf = sshbuf_new()) == NULL)
1377: fatal("%s could not allocate buffer", __func__);
1378: if ((r = sshkey_private_serialize(key, buf)) != 0)
1379: fatal("sshkey_private_serialize: %s", ssh_err(r));
1380: if (ssh_digest_update(ctx, sshbuf_ptr(buf), sshbuf_len(buf)) != 0)
1381: fatal("%s: ssh_digest_update", __func__);
1382: sshbuf_reset(buf);
1383: sshbuf_free(buf);
1384: }
1385:
1.545 djm 1386: static char *
1387: prepare_proctitle(int ac, char **av)
1388: {
1389: char *ret = NULL;
1390: int i;
1391:
1392: for (i = 0; i < ac; i++)
1393: xextendf(&ret, " ", "%s", av[i]);
1394: return ret;
1395: }
1396:
1.65 deraadt 1397: /*
1398: * Main program for the daemon.
1399: */
1.2 provos 1400: int
1401: main(int ac, char **av)
1.1 deraadt 1402: {
1.466 djm 1403: struct ssh *ssh = NULL;
1.64 markus 1404: extern char *optarg;
1405: extern int optind;
1.493 djm 1406: int r, opt, on = 1, already_daemon, remote_port;
1.297 avsm 1407: int sock_in = -1, sock_out = -1, newsock = -1;
1.496 djm 1408: const char *remote_ip, *rdomain;
1.447 dtucker 1409: char *fp, *line, *laddr, *logfile = NULL;
1.345 djm 1410: int config_s[2] = { -1 , -1 };
1.493 djm 1411: u_int i, j;
1.364 markus 1412: u_int64_t ibytes, obytes;
1.362 dtucker 1413: mode_t new_umask;
1.488 markus 1414: struct sshkey *key;
1415: struct sshkey *pubkey;
1.404 markus 1416: int keytype;
1.230 provos 1417: Authctxt *authctxt;
1.498 dtucker 1418: struct connection_info *connection_info = NULL;
1.64 markus 1419:
1.138 markus 1420: /* Save argv. */
1.64 markus 1421: saved_argv = av;
1.294 djm 1422: rexec_argc = ac;
1.313 djm 1423:
1424: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1425: sanitise_stdfd();
1.64 markus 1426:
1427: /* Initialize configuration options to their default values. */
1428: initialize_server_options(&options);
1429:
1430: /* Parse command-line arguments. */
1.450 djm 1431: while ((opt = getopt(ac, av,
1432: "C:E:b:c:f:g:h:k:o:p:u:46DQRTdeiqrt")) != -1) {
1.64 markus 1433: switch (opt) {
1.75 markus 1434: case '4':
1.305 djm 1435: options.address_family = AF_INET;
1.75 markus 1436: break;
1437: case '6':
1.305 djm 1438: options.address_family = AF_INET6;
1.75 markus 1439: break;
1.64 markus 1440: case 'f':
1441: config_file_name = optarg;
1442: break;
1.373 djm 1443: case 'c':
1.493 djm 1444: servconf_add_hostcert("[command-line]", 0,
1445: &options, optarg);
1.373 djm 1446: break;
1.64 markus 1447: case 'd':
1.273 markus 1448: if (debug_flag == 0) {
1.127 markus 1449: debug_flag = 1;
1450: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.273 markus 1451: } else if (options.log_level < SYSLOG_LEVEL_DEBUG3)
1.127 markus 1452: options.log_level++;
1.64 markus 1453: break;
1.135 markus 1454: case 'D':
1455: no_daemon_flag = 1;
1.192 lebel 1456: break;
1.399 dtucker 1457: case 'E':
1.459 dtucker 1458: logfile = optarg;
1.399 dtucker 1459: /* FALLTHROUGH */
1.192 lebel 1460: case 'e':
1461: log_stderr = 1;
1.135 markus 1462: break;
1.64 markus 1463: case 'i':
1464: inetd_flag = 1;
1465: break;
1.294 djm 1466: case 'r':
1467: rexec_flag = 0;
1468: break;
1469: case 'R':
1470: rexeced_flag = 1;
1471: inetd_flag = 1;
1472: break;
1.64 markus 1473: case 'Q':
1.158 markus 1474: /* ignored */
1.64 markus 1475: break;
1476: case 'q':
1477: options.log_level = SYSLOG_LEVEL_QUIET;
1478: break;
1479: case 'b':
1.473 naddy 1480: /* protocol 1, ignored */
1.64 markus 1481: break;
1482: case 'p':
1.75 markus 1483: options.ports_from_cmdline = 1;
1.127 markus 1484: if (options.num_ports >= MAX_PORTS) {
1485: fprintf(stderr, "too many ports.\n");
1486: exit(1);
1487: }
1.193 stevesk 1488: options.ports[options.num_ports++] = a2port(optarg);
1.366 djm 1489: if (options.ports[options.num_ports-1] <= 0) {
1.193 stevesk 1490: fprintf(stderr, "Bad port number.\n");
1491: exit(1);
1492: }
1.64 markus 1493: break;
1494: case 'g':
1.197 stevesk 1495: if ((options.login_grace_time = convtime(optarg)) == -1) {
1496: fprintf(stderr, "Invalid login grace time.\n");
1497: exit(1);
1498: }
1.64 markus 1499: break;
1500: case 'k':
1.473 naddy 1501: /* protocol 1, ignored */
1.64 markus 1502: break;
1503: case 'h':
1.493 djm 1504: servconf_add_hostkey("[command-line]", 0,
1.519 djm 1505: &options, optarg, 1);
1.64 markus 1506: break;
1.203 stevesk 1507: case 't':
1508: test_flag = 1;
1509: break;
1.358 dtucker 1510: case 'T':
1511: test_flag = 2;
1512: break;
1513: case 'C':
1.523 djm 1514: connection_info = get_connection_info(ssh, 0, 0);
1.391 dtucker 1515: if (parse_server_match_testspec(connection_info,
1516: optarg) == -1)
1517: exit(1);
1.358 dtucker 1518: break;
1.125 markus 1519: case 'u':
1.438 deraadt 1520: utmp_len = (u_int)strtonum(optarg, 0, HOST_NAME_MAX+1+1, NULL);
1521: if (utmp_len > HOST_NAME_MAX+1) {
1.257 stevesk 1522: fprintf(stderr, "Invalid utmp length.\n");
1523: exit(1);
1524: }
1.125 markus 1525: break;
1.215 markus 1526: case 'o':
1.283 markus 1527: line = xstrdup(optarg);
1528: if (process_server_config_line(&options, line,
1.546 djm 1529: "command-line", 0, NULL, NULL, &includes) != 0)
1.217 deraadt 1530: exit(1);
1.402 djm 1531: free(line);
1.215 markus 1532: break;
1.64 markus 1533: case '?':
1534: default:
1.215 markus 1535: usage();
1536: break;
1.64 markus 1537: }
1538: }
1.294 djm 1539: if (rexeced_flag || inetd_flag)
1540: rexec_flag = 0;
1.518 djm 1541: if (!test_flag && rexec_flag && !path_absolute(av[0]))
1.294 djm 1542: fatal("sshd re-exec requires execution with an absolute path");
1543: if (rexeced_flag)
1.296 djm 1544: closefrom(REEXEC_MIN_FREE_FD);
1545: else
1546: closefrom(REEXEC_DEVCRYPTO_RESERVED_FD);
1.294 djm 1547:
1.426 markus 1548: #ifdef WITH_OPENSSL
1.379 djm 1549: OpenSSL_add_all_algorithms();
1.426 markus 1550: #endif
1.64 markus 1551:
1.399 dtucker 1552: /* If requested, redirect the logs to the specified logfile. */
1.459 dtucker 1553: if (logfile != NULL)
1.399 dtucker 1554: log_redirect_stderr_to(logfile);
1.75 markus 1555: /*
1556: * Force logging to stderr until we have loaded the private host
1557: * key (unless started from inetd)
1558: */
1.138 markus 1559: log_init(__progname,
1.224 markus 1560: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1561: SYSLOG_LEVEL_INFO : options.log_level,
1562: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1563: SYSLOG_FACILITY_AUTH : options.log_facility,
1.548 djm 1564: log_stderr || !inetd_flag || debug_flag);
1.75 markus 1565:
1.294 djm 1566: sensitive_data.have_ssh2_key = 0;
1567:
1.358 dtucker 1568: /*
1.498 dtucker 1569: * If we're not doing an extended test do not silently ignore connection
1570: * test params.
1.358 dtucker 1571: */
1.498 dtucker 1572: if (test_flag < 2 && connection_info != NULL)
1.358 dtucker 1573: fatal("Config test connection parameter (-C) provided without "
1574: "test mode (-T)");
1575:
1.294 djm 1576: /* Fetch our configuration */
1.511 markus 1577: if ((cfg = sshbuf_new()) == NULL)
1578: fatal("%s: sshbuf_new failed", __func__);
1.533 djm 1579: if (rexeced_flag) {
1.511 markus 1580: recv_rexec_state(REEXEC_CONFIG_PASS_FD, cfg);
1.533 djm 1581: if (!debug_flag) {
1582: startup_pipe = dup(REEXEC_STARTUP_PIPE_FD);
1583: close(REEXEC_STARTUP_PIPE_FD);
1584: /*
1585: * Signal parent that this child is at a point where
1586: * they can go away if they have a SIGHUP pending.
1587: */
1588: (void)atomicio(vwrite, startup_pipe, "\0", 1);
1589: }
1.549 djm 1590: } else if (strcasecmp(config_file_name, "none") != 0)
1.511 markus 1591: load_server_config(config_file_name, cfg);
1.294 djm 1592:
1.337 dtucker 1593: parse_server_config(&options, rexeced_flag ? "rexec" : config_file_name,
1.546 djm 1594: cfg, &includes, NULL);
1.64 markus 1595:
1596: /* Fill in default values for those options not explicitly set. */
1597: fill_default_server_options(&options);
1.350 dtucker 1598:
1599: /* challenge-response is implemented via keyboard interactive */
1600: if (options.challenge_response_authentication)
1601: options.kbd_interactive_authentication = 1;
1.395 djm 1602:
1603: /* Check that options are sensible */
1604: if (options.authorized_keys_command_user == NULL &&
1605: (options.authorized_keys_command != NULL &&
1606: strcasecmp(options.authorized_keys_command, "none") != 0))
1607: fatal("AuthorizedKeysCommand set without "
1608: "AuthorizedKeysCommandUser");
1.449 djm 1609: if (options.authorized_principals_command_user == NULL &&
1610: (options.authorized_principals_command != NULL &&
1611: strcasecmp(options.authorized_principals_command, "none") != 0))
1612: fatal("AuthorizedPrincipalsCommand set without "
1613: "AuthorizedPrincipalsCommandUser");
1.396 djm 1614:
1615: /*
1616: * Check whether there is any path through configured auth methods.
1617: * Unfortunately it is not possible to verify this generally before
1618: * daemonisation in the presence of Match block, but this catches
1619: * and warns for trivial misconfigurations that could break login.
1620: */
1621: if (options.num_auth_methods != 0) {
1.493 djm 1622: for (i = 0; i < options.num_auth_methods; i++) {
1623: if (auth2_methods_valid(options.auth_methods[i],
1.396 djm 1624: 1) == 0)
1625: break;
1626: }
1.493 djm 1627: if (i >= options.num_auth_methods)
1.396 djm 1628: fatal("AuthenticationMethods cannot be satisfied by "
1629: "enabled authentication methods");
1630: }
1.305 djm 1631:
1.64 markus 1632: /* Check that there are no remaining arguments. */
1633: if (optind < ac) {
1634: fprintf(stderr, "Extra argument %s.\n", av[optind]);
1635: exit(1);
1636: }
1637:
1.397 dtucker 1638: debug("sshd version %s, %s", SSH_VERSION,
1.426 markus 1639: #ifdef WITH_OPENSSL
1.517 djm 1640: OpenSSL_version(OPENSSL_VERSION)
1.426 markus 1641: #else
1642: "without OpenSSL"
1643: #endif
1644: );
1.64 markus 1645:
1.404 markus 1646: /* load host keys */
1.329 djm 1647: sensitive_data.host_keys = xcalloc(options.num_host_key_files,
1.488 markus 1648: sizeof(struct sshkey *));
1.404 markus 1649: sensitive_data.host_pubkeys = xcalloc(options.num_host_key_files,
1.488 markus 1650: sizeof(struct sshkey *));
1.404 markus 1651:
1652: if (options.host_key_agent) {
1653: if (strcmp(options.host_key_agent, SSH_AUTHSOCKET_ENV_NAME))
1654: setenv(SSH_AUTHSOCKET_ENV_NAME,
1655: options.host_key_agent, 1);
1.433 djm 1656: if ((r = ssh_get_authentication_socket(NULL)) == 0)
1657: have_agent = 1;
1658: else
1659: error("Could not connect to agent \"%s\": %s",
1660: options.host_key_agent, ssh_err(r));
1.404 markus 1661: }
1.134 markus 1662:
1.217 deraadt 1663: for (i = 0; i < options.num_host_key_files; i++) {
1.519 djm 1664: int ll = options.host_key_file_userprovided[i] ?
1665: SYSLOG_LEVEL_ERROR : SYSLOG_LEVEL_DEBUG1;
1666:
1.430 djm 1667: if (options.host_key_files[i] == NULL)
1668: continue;
1.512 markus 1669: if ((r = sshkey_load_private(options.host_key_files[i], "",
1670: &key, NULL)) != 0 && r != SSH_ERR_SYSTEM_ERROR)
1.519 djm 1671: do_log2(ll, "Unable to load host key \"%s\": %s",
1.512 markus 1672: options.host_key_files[i], ssh_err(r));
1.542 djm 1673: if (sshkey_is_sk(key) &&
1674: key->sk_flags & SSH_SK_USER_PRESENCE_REQD) {
1675: debug("host key %s requires user presence, ignoring",
1676: options.host_key_files[i]);
1677: key->sk_flags &= ~SSH_SK_USER_PRESENCE_REQD;
1678: }
1679: if (r == 0 && key != NULL &&
1680: (r = sshkey_shield_private(key)) != 0) {
1.536 djm 1681: do_log2(ll, "Unable to shield host key \"%s\": %s",
1682: options.host_key_files[i], ssh_err(r));
1683: sshkey_free(key);
1684: key = NULL;
1685: }
1.512 markus 1686: if ((r = sshkey_load_public(options.host_key_files[i],
1687: &pubkey, NULL)) != 0 && r != SSH_ERR_SYSTEM_ERROR)
1.519 djm 1688: do_log2(ll, "Unable to load host key \"%s\": %s",
1.512 markus 1689: options.host_key_files[i], ssh_err(r));
1.439 djm 1690: if (pubkey == NULL && key != NULL)
1.515 djm 1691: if ((r = sshkey_from_private(key, &pubkey)) != 0)
1.512 markus 1692: fatal("Could not demote key: \"%s\": %s",
1693: options.host_key_files[i], ssh_err(r));
1.179 markus 1694: sensitive_data.host_keys[i] = key;
1.404 markus 1695: sensitive_data.host_pubkeys[i] = pubkey;
1696:
1.472 markus 1697: if (key == NULL && pubkey != NULL && have_agent) {
1.443 djm 1698: debug("will rely on agent for hostkey %s",
1699: options.host_key_files[i]);
1.404 markus 1700: keytype = pubkey->type;
1701: } else if (key != NULL) {
1702: keytype = key->type;
1.511 markus 1703: accumulate_host_timing_secret(cfg, key);
1.404 markus 1704: } else {
1.519 djm 1705: do_log2(ll, "Unable to load host key: %s",
1.195 markus 1706: options.host_key_files[i]);
1.179 markus 1707: sensitive_data.host_keys[i] = NULL;
1.404 markus 1708: sensitive_data.host_pubkeys[i] = NULL;
1.134 markus 1709: continue;
1710: }
1.404 markus 1711:
1712: switch (keytype) {
1.134 markus 1713: case KEY_RSA:
1714: case KEY_DSA:
1.378 djm 1715: case KEY_ECDSA:
1.412 markus 1716: case KEY_ED25519:
1.542 djm 1717: case KEY_ECDSA_SK:
1718: case KEY_ED25519_SK:
1.505 markus 1719: case KEY_XMSS:
1.441 djm 1720: if (have_agent || key != NULL)
1721: sensitive_data.have_ssh2_key = 1;
1.134 markus 1722: break;
1723: }
1.441 djm 1724: if ((fp = sshkey_fingerprint(pubkey, options.fingerprint_hash,
1725: SSH_FP_DEFAULT)) == NULL)
1726: fatal("sshkey_fingerprint failed");
1727: debug("%s host key #%d: %s %s",
1.472 markus 1728: key ? "private" : "agent", i, sshkey_ssh_name(pubkey), fp);
1.441 djm 1729: free(fp);
1.134 markus 1730: }
1.511 markus 1731: accumulate_host_timing_secret(cfg, NULL);
1.472 markus 1732: if (!sensitive_data.have_ssh2_key) {
1.264 itojun 1733: logit("sshd: no hostkeys available -- exiting.");
1.64 markus 1734: exit(1);
1735: }
1736:
1.373 djm 1737: /*
1738: * Load certificates. They are stored in an array at identical
1739: * indices to the public keys that they relate to.
1740: */
1741: sensitive_data.host_certificates = xcalloc(options.num_host_key_files,
1.488 markus 1742: sizeof(struct sshkey *));
1.373 djm 1743: for (i = 0; i < options.num_host_key_files; i++)
1744: sensitive_data.host_certificates[i] = NULL;
1745:
1746: for (i = 0; i < options.num_host_cert_files; i++) {
1.430 djm 1747: if (options.host_cert_files[i] == NULL)
1748: continue;
1.512 markus 1749: if ((r = sshkey_load_public(options.host_cert_files[i],
1750: &key, NULL)) != 0) {
1751: error("Could not load host certificate \"%s\": %s",
1752: options.host_cert_files[i], ssh_err(r));
1.373 djm 1753: continue;
1754: }
1.512 markus 1755: if (!sshkey_is_cert(key)) {
1.373 djm 1756: error("Certificate file is not a certificate: %s",
1757: options.host_cert_files[i]);
1.512 markus 1758: sshkey_free(key);
1.373 djm 1759: continue;
1760: }
1761: /* Find matching private key */
1762: for (j = 0; j < options.num_host_key_files; j++) {
1.512 markus 1763: if (sshkey_equal_public(key,
1.373 djm 1764: sensitive_data.host_keys[j])) {
1765: sensitive_data.host_certificates[j] = key;
1766: break;
1767: }
1768: }
1769: if (j >= options.num_host_key_files) {
1770: error("No matching private key for certificate: %s",
1771: options.host_cert_files[i]);
1.512 markus 1772: sshkey_free(key);
1.373 djm 1773: continue;
1774: }
1775: sensitive_data.host_certificates[j] = key;
1.493 djm 1776: debug("host certificate: #%u type %d %s", j, key->type,
1.512 markus 1777: sshkey_type(key));
1.373 djm 1778: }
1.426 markus 1779:
1.244 markus 1780: if (use_privsep) {
1781: struct stat st;
1782:
1.327 deraadt 1783: if (getpwnam(SSH_PRIVSEP_USER) == NULL)
1.244 markus 1784: fatal("Privilege separation user %s does not exist",
1785: SSH_PRIVSEP_USER);
1.500 djm 1786: endpwent();
1.244 markus 1787: if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) ||
1788: (S_ISDIR(st.st_mode) == 0))
1789: fatal("Missing privilege separation directory: %s",
1.247 stevesk 1790: _PATH_PRIVSEP_CHROOT_DIR);
1791: if (st.st_uid != 0 || (st.st_mode & (S_IWGRP|S_IWOTH)) != 0)
1.262 markus 1792: fatal("%s must be owned by root and not group or "
1793: "world-writable.", _PATH_PRIVSEP_CHROOT_DIR);
1.358 dtucker 1794: }
1795:
1796: if (test_flag > 1) {
1.499 djm 1797: /*
1798: * If no connection info was provided by -C then use
1799: * use a blank one that will cause no predicate to match.
1800: */
1801: if (connection_info == NULL)
1.523 djm 1802: connection_info = get_connection_info(ssh, 0, 0);
1.534 dtucker 1803: connection_info->test = 1;
1.546 djm 1804: parse_server_match_config(&options, &includes, connection_info);
1.358 dtucker 1805: dump_config(&options);
1.108 markus 1806: }
1.203 stevesk 1807:
1808: /* Configuration looks good, so exit if in test mode. */
1809: if (test_flag)
1810: exit(0);
1.108 markus 1811:
1.294 djm 1812: if (rexec_flag) {
1.493 djm 1813: if (rexec_argc < 0)
1814: fatal("rexec_argc %d < 0", rexec_argc);
1.329 djm 1815: rexec_argv = xcalloc(rexec_argc + 2, sizeof(char *));
1.493 djm 1816: for (i = 0; i < (u_int)rexec_argc; i++) {
1.294 djm 1817: debug("rexec_argv[%d]='%s'", i, saved_argv[i]);
1818: rexec_argv[i] = saved_argv[i];
1819: }
1820: rexec_argv[rexec_argc] = "-R";
1821: rexec_argv[rexec_argc + 1] = NULL;
1822: }
1.545 djm 1823: listener_proctitle = prepare_proctitle(ac, av);
1.362 dtucker 1824:
1825: /* Ensure that umask disallows at least group and world write */
1826: new_umask = umask(0077) | 0022;
1827: (void) umask(new_umask);
1.294 djm 1828:
1.108 markus 1829: /* Initialize the log (it is reinitialized below in case we forked). */
1.306 dtucker 1830: if (debug_flag && (!inetd_flag || rexeced_flag))
1.64 markus 1831: log_stderr = 1;
1.138 markus 1832: log_init(__progname, options.log_level, options.log_facility, log_stderr);
1.64 markus 1833:
1.108 markus 1834: /*
1.478 dtucker 1835: * If not in debugging mode, not started from inetd and not already
1836: * daemonized (eg re-exec via SIGHUP), disconnect from the controlling
1837: * terminal, and fork. The original process exits.
1.108 markus 1838: */
1.478 dtucker 1839: already_daemon = daemonized();
1840: if (!(debug_flag || inetd_flag || no_daemon_flag || already_daemon)) {
1.345 djm 1841:
1.537 deraadt 1842: if (daemon(0, 0) == -1)
1.64 markus 1843: fatal("daemon() failed: %.200s", strerror(errno));
1844:
1.477 dtucker 1845: disconnect_controlling_tty();
1.64 markus 1846: }
1847: /* Reinitialize the log (because of the fork above). */
1.138 markus 1848: log_init(__progname, options.log_level, options.log_facility, log_stderr);
1.64 markus 1849:
1850: /* Chdir to the root directory so that the current disk can be
1851: unmounted if desired. */
1.401 dtucker 1852: if (chdir("/") == -1)
1853: error("chdir(\"/\"): %s", strerror(errno));
1.217 deraadt 1854:
1.178 markus 1855: /* ignore SIGPIPE */
1.544 dtucker 1856: ssh_signal(SIGPIPE, SIG_IGN);
1.64 markus 1857:
1.345 djm 1858: /* Get a connection, either from inetd or a listening TCP socket */
1.64 markus 1859: if (inetd_flag) {
1.345 djm 1860: server_accept_inetd(&sock_in, &sock_out);
1.64 markus 1861: } else {
1.345 djm 1862: server_listen();
1.75 markus 1863:
1.544 dtucker 1864: ssh_signal(SIGHUP, sighup_handler);
1865: ssh_signal(SIGCHLD, main_sigchld_handler);
1866: ssh_signal(SIGTERM, sigterm_handler);
1867: ssh_signal(SIGQUIT, sigterm_handler);
1.201 markus 1868:
1.345 djm 1869: /*
1870: * Write out the pid file after the sigterm handler
1871: * is setup and the listen sockets are bound
1872: */
1.479 dtucker 1873: if (options.pid_file != NULL && !debug_flag) {
1.345 djm 1874: FILE *f = fopen(options.pid_file, "w");
1.201 markus 1875:
1.270 djm 1876: if (f == NULL) {
1877: error("Couldn't create pid file \"%s\": %s",
1878: options.pid_file, strerror(errno));
1879: } else {
1.245 mpech 1880: fprintf(f, "%ld\n", (long) getpid());
1.64 markus 1881: fclose(f);
1882: }
1883: }
1884:
1.345 djm 1885: /* Accept a connection and return in a forked child */
1886: server_accept_loop(&sock_in, &sock_out,
1887: &newsock, config_s);
1.1 deraadt 1888: }
1889:
1.64 markus 1890: /* This is the child processing a new connection. */
1.288 markus 1891: setproctitle("%s", "[accepted]");
1.294 djm 1892:
1.300 markus 1893: /*
1894: * Create a new session and process group since the 4.4BSD
1895: * setlogin() affects the entire process group. We don't
1896: * want the child to be able to affect the parent.
1897: */
1.537 deraadt 1898: if (!debug_flag && !inetd_flag && setsid() == -1)
1.300 markus 1899: error("setsid: %.100s", strerror(errno));
1900:
1.294 djm 1901: if (rexec_flag) {
1902: int fd;
1903:
1.296 djm 1904: debug("rexec start in %d out %d newsock %d pipe %d sock %d",
1905: sock_in, sock_out, newsock, startup_pipe, config_s[0]);
1.294 djm 1906: dup2(newsock, STDIN_FILENO);
1907: dup2(STDIN_FILENO, STDOUT_FILENO);
1908: if (startup_pipe == -1)
1.296 djm 1909: close(REEXEC_STARTUP_PIPE_FD);
1.407 djm 1910: else if (startup_pipe != REEXEC_STARTUP_PIPE_FD) {
1.296 djm 1911: dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD);
1.407 djm 1912: close(startup_pipe);
1913: startup_pipe = REEXEC_STARTUP_PIPE_FD;
1914: }
1.294 djm 1915:
1.296 djm 1916: dup2(config_s[1], REEXEC_CONFIG_PASS_FD);
1.294 djm 1917: close(config_s[1]);
1.296 djm 1918:
1.294 djm 1919: execv(rexec_argv[0], rexec_argv);
1920:
1921: /* Reexec has failed, fall back and continue */
1922: error("rexec of %s failed: %s", rexec_argv[0], strerror(errno));
1.296 djm 1923: recv_rexec_state(REEXEC_CONFIG_PASS_FD, NULL);
1.294 djm 1924: log_init(__progname, options.log_level,
1925: options.log_facility, log_stderr);
1926:
1927: /* Clean up fds */
1.296 djm 1928: close(REEXEC_CONFIG_PASS_FD);
1929: newsock = sock_out = sock_in = dup(STDIN_FILENO);
1.294 djm 1930: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1931: dup2(fd, STDIN_FILENO);
1932: dup2(fd, STDOUT_FILENO);
1933: if (fd > STDERR_FILENO)
1934: close(fd);
1935: }
1.296 djm 1936: debug("rexec cleanup in %d out %d newsock %d pipe %d sock %d",
1937: sock_in, sock_out, newsock, startup_pipe, config_s[0]);
1.294 djm 1938: }
1.372 djm 1939:
1940: /* Executed child processes don't need these. */
1941: fcntl(sock_out, F_SETFD, FD_CLOEXEC);
1942: fcntl(sock_in, F_SETFD, FD_CLOEXEC);
1.64 markus 1943:
1.551 dtucker 1944: /* We will not restart on SIGHUP since it no longer makes sense. */
1.544 dtucker 1945: ssh_signal(SIGALRM, SIG_DFL);
1946: ssh_signal(SIGHUP, SIG_DFL);
1947: ssh_signal(SIGTERM, SIG_DFL);
1948: ssh_signal(SIGQUIT, SIG_DFL);
1949: ssh_signal(SIGCHLD, SIG_DFL);
1.150 markus 1950:
1.66 markus 1951: /*
1952: * Register our connection. This turns encryption off because we do
1953: * not have a key.
1954: */
1.525 djm 1955: if ((ssh = ssh_packet_set_connection(NULL, sock_in, sock_out)) == NULL)
1956: fatal("Unable to create connection");
1.527 djm 1957: the_active_state = ssh;
1.525 djm 1958: ssh_packet_set_server(ssh);
1.492 djm 1959:
1.466 djm 1960: check_ip_options(ssh);
1.309 djm 1961:
1.492 djm 1962: /* Prepare the channels layer */
1963: channel_init_channels(ssh);
1964: channel_set_af(ssh, options.address_family);
1965: process_permitopen(ssh, &options);
1966:
1.309 djm 1967: /* Set SO_KEEPALIVE if requested. */
1.525 djm 1968: if (options.tcp_keep_alive && ssh_packet_connection_is_on_socket(ssh) &&
1.537 deraadt 1969: setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) == -1)
1.309 djm 1970: error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
1.1 deraadt 1971:
1.466 djm 1972: if ((remote_port = ssh_remote_port(ssh)) < 0) {
1973: debug("ssh_remote_port failed");
1.310 markus 1974: cleanup_exit(255);
1975: }
1.316 dtucker 1976:
1977: /*
1.331 markus 1978: * The rest of the code depends on the fact that
1.466 djm 1979: * ssh_remote_ipaddr() caches the remote ip, even if
1.331 markus 1980: * the socket goes away.
1981: */
1.466 djm 1982: remote_ip = ssh_remote_ipaddr(ssh);
1.209 markus 1983:
1.496 djm 1984: rdomain = ssh_packet_rdomain_in(ssh);
1985:
1.64 markus 1986: /* Log the connection. */
1.447 dtucker 1987: laddr = get_local_ipaddr(sock_in);
1.497 djm 1988: verbose("Connection from %s port %d on %s port %d%s%s%s",
1.496 djm 1989: remote_ip, remote_port, laddr, ssh_local_port(ssh),
1.497 djm 1990: rdomain == NULL ? "" : " rdomain \"",
1991: rdomain == NULL ? "" : rdomain,
1992: rdomain == NULL ? "" : "\"");
1.447 dtucker 1993: free(laddr);
1.1 deraadt 1994:
1.66 markus 1995: /*
1.317 djm 1996: * We don't want to listen forever unless the other side
1.66 markus 1997: * successfully authenticates itself. So we set up an alarm which is
1998: * cleared after successful authentication. A limit of zero
1.317 djm 1999: * indicates no limit. Note that we don't set the alarm in debugging
1.66 markus 2000: * mode; it is just annoying to have the server exit just when you
2001: * are about to discover the bug.
2002: */
1.544 dtucker 2003: ssh_signal(SIGALRM, grace_alarm_handler);
1.64 markus 2004: if (!debug_flag)
2005: alarm(options.login_grace_time);
2006:
1.552 djm 2007: if ((r = kex_exchange_identification(ssh, -1,
2008: options.version_addendum)) != 0)
2009: sshpkt_fatal(ssh, r, "banner exchange");
1.520 djm 2010:
1.525 djm 2011: ssh_packet_set_nonblocking(ssh);
1.1 deraadt 2012:
1.278 markus 2013: /* allocate authentication context */
1.329 djm 2014: authctxt = xcalloc(1, sizeof(*authctxt));
1.525 djm 2015: ssh->authctxt = authctxt;
1.278 markus 2016:
2017: /* XXX global for cleanup, access from other modules */
2018: the_authctxt = authctxt;
1.506 djm 2019:
2020: /* Set default key authentication options */
2021: if ((auth_opts = sshauthopt_new_with_keys_defaults()) == NULL)
2022: fatal("allocation failed");
1.278 markus 2023:
1.307 otto 2024: /* prepare buffer to collect messages to display to user after login */
1.510 markus 2025: if ((loginmsg = sshbuf_new()) == NULL)
2026: fatal("%s: sshbuf_new failed", __func__);
1.374 dtucker 2027: auth_debug_reset();
1.307 otto 2028:
1.404 markus 2029: if (use_privsep) {
1.525 djm 2030: if (privsep_preauth(ssh) == 1)
1.237 markus 2031: goto authenticated;
1.472 markus 2032: } else if (have_agent) {
1.432 djm 2033: if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) {
2034: error("Unable to get agent socket: %s", ssh_err(r));
1.433 djm 2035: have_agent = 0;
1.432 djm 2036: }
2037: }
1.231 provos 2038:
1.77 markus 2039: /* perform the key exchange */
2040: /* authenticate user and start session */
1.525 djm 2041: do_ssh2_kex(ssh);
1.524 djm 2042: do_authentication2(ssh);
1.472 markus 2043:
1.237 markus 2044: /*
2045: * If we use privilege separation, the unprivileged child transfers
2046: * the current keystate and exits
2047: */
2048: if (use_privsep) {
1.527 djm 2049: mm_send_keystate(ssh, pmonitor);
1.525 djm 2050: ssh_packet_clear_keys(ssh);
1.231 provos 2051: exit(0);
1.237 markus 2052: }
1.231 provos 2053:
2054: authenticated:
1.318 djm 2055: /*
2056: * Cancel the alarm we set to limit the time taken for
2057: * authentication.
2058: */
2059: alarm(0);
1.544 dtucker 2060: ssh_signal(SIGALRM, SIG_DFL);
1.347 markus 2061: authctxt->authenticated = 1;
1.318 djm 2062: if (startup_pipe != -1) {
2063: close(startup_pipe);
2064: startup_pipe = -1;
2065: }
1.495 djm 2066:
2067: if (options.routing_domain != NULL)
2068: set_process_rdomain(ssh, options.routing_domain);
1.318 djm 2069:
1.234 markus 2070: /*
1.231 provos 2071: * In privilege separation, we fork another child and prepare
2072: * file descriptor passing.
2073: */
2074: if (use_privsep) {
1.525 djm 2075: privsep_postauth(ssh, authctxt);
1.237 markus 2076: /* the monitor process [priv] will not return */
1.231 provos 2077: }
1.360 dtucker 2078:
1.525 djm 2079: ssh_packet_set_timeout(ssh, options.client_alive_interval,
1.360 dtucker 2080: options.client_alive_count_max);
1.439 djm 2081:
2082: /* Try to send all our hostkeys to the client */
1.492 djm 2083: notify_hostkeys(ssh);
1.230 provos 2084:
1.278 markus 2085: /* Start session. */
1.492 djm 2086: do_authenticated(ssh, authctxt);
1.230 provos 2087:
1.64 markus 2088: /* The connection has been terminated. */
1.525 djm 2089: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.381 djm 2090: verbose("Transferred: sent %llu, received %llu bytes",
2091: (unsigned long long)obytes, (unsigned long long)ibytes);
1.364 markus 2092:
2093: verbose("Closing connection to %.500s port %d", remote_ip, remote_port);
1.525 djm 2094: ssh_packet_close(ssh);
1.231 provos 2095:
2096: if (use_privsep)
2097: mm_terminate();
2098:
1.64 markus 2099: exit(0);
1.1 deraadt 2100: }
1.98 markus 2101:
1.435 markus 2102: int
1.527 djm 2103: sshd_hostkey_sign(struct ssh *ssh, struct sshkey *privkey,
2104: struct sshkey *pubkey, u_char **signature, size_t *slenp,
2105: const u_char *data, size_t dlen, const char *alg)
1.404 markus 2106: {
1.432 djm 2107: int r;
2108:
1.527 djm 2109: if (use_privsep) {
2110: if (privkey) {
2111: if (mm_sshkey_sign(ssh, privkey, signature, slenp,
1.542 djm 2112: data, dlen, alg, options.sk_provider,
2113: ssh->compat) < 0)
1.527 djm 2114: fatal("%s: privkey sign failed", __func__);
2115: } else {
2116: if (mm_sshkey_sign(ssh, pubkey, signature, slenp,
1.542 djm 2117: data, dlen, alg, options.sk_provider,
2118: ssh->compat) < 0)
1.527 djm 2119: fatal("%s: pubkey sign failed", __func__);
2120: }
1.404 markus 2121: } else {
1.527 djm 2122: if (privkey) {
2123: if (sshkey_sign(privkey, signature, slenp, data, dlen,
1.542 djm 2124: alg, options.sk_provider, ssh->compat) < 0)
1.527 djm 2125: fatal("%s: privkey sign failed", __func__);
2126: } else {
2127: if ((r = ssh_agent_sign(auth_sock, pubkey,
2128: signature, slenp, data, dlen, alg,
2129: ssh->compat)) != 0) {
2130: fatal("%s: agent sign failed: %s",
2131: __func__, ssh_err(r));
2132: }
2133: }
1.404 markus 2134: }
1.435 markus 2135: return 0;
1.404 markus 2136: }
2137:
1.452 djm 2138: /* SSH2 key exchange */
1.200 itojun 2139: static void
1.525 djm 2140: do_ssh2_kex(struct ssh *ssh)
1.98 markus 2141: {
1.422 markus 2142: char *myproposal[PROPOSAL_MAX] = { KEX_SERVER };
1.435 markus 2143: struct kex *kex;
1.437 markus 2144: int r;
1.102 markus 2145:
1.457 djm 2146: myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(
1.514 djm 2147: options.kex_algorithms);
1.457 djm 2148: myproposal[PROPOSAL_ENC_ALGS_CTOS] = compat_cipher_proposal(
1.514 djm 2149: options.ciphers);
1.457 djm 2150: myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal(
1.514 djm 2151: options.ciphers);
1.457 djm 2152: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
2153: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
2154:
1.312 markus 2155: if (options.compression == COMP_NONE) {
1.246 markus 2156: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
1.470 dtucker 2157: myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
1.102 markus 2158: }
1.400 dtucker 2159:
2160: if (options.rekey_limit || options.rekey_interval)
1.525 djm 2161: ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
1.481 dtucker 2162: options.rekey_interval);
1.327 deraadt 2163:
1.413 djm 2164: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal(
1.514 djm 2165: list_hostkey_types());
1.134 markus 2166:
1.189 markus 2167: /* start key exchange */
1.525 djm 2168: if ((r = kex_setup(ssh, myproposal)) != 0)
1.437 markus 2169: fatal("kex_setup: %s", ssh_err(r));
1.525 djm 2170: kex = ssh->kex;
1.426 markus 2171: #ifdef WITH_OPENSSL
1.532 djm 2172: kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_server;
2173: kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_server;
2174: kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_server;
2175: kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_server;
2176: kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_server;
1.263 markus 2177: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1.324 djm 2178: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1.532 djm 2179: kex->kex[KEX_ECDH_SHA2] = kex_gen_server;
1.426 markus 2180: #endif
1.532 djm 2181: kex->kex[KEX_C25519_SHA256] = kex_gen_server;
2182: kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_server;
1.373 djm 2183: kex->load_host_public_key=&get_hostkey_public_by_type;
2184: kex->load_host_private_key=&get_hostkey_private_by_type;
1.231 provos 2185: kex->host_key_index=&get_hostkey_index;
1.404 markus 2186: kex->sign = sshd_hostkey_sign;
1.189 markus 2187:
1.525 djm 2188: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &kex->done);
1.187 markus 2189:
2190: session_id2 = kex->session_id;
2191: session_id2_len = kex->session_id_len;
1.129 provos 2192:
2193: #ifdef DEBUG_KEXDH
2194: /* send 1st encrypted/maced/compressed message */
1.553 djm 2195: if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE)) != 0 ||
2196: (r = sshpkt_put_cstring(ssh, "markus")) != 0 ||
2197: (r = sshpkt_send(ssh)) != 0 ||
2198: (r = ssh_packet_write_wait(ssh)) != 0)
2199: fatal("%s: send test: %s", __func__, ssh_err(r));
1.129 provos 2200: #endif
1.186 markus 2201: debug("KEX done");
1.278 markus 2202: }
2203:
2204: /* server specific fatal cleanup */
2205: void
2206: cleanup_exit(int i)
2207: {
1.527 djm 2208: if (the_active_state != NULL && the_authctxt != NULL) {
2209: do_cleanup(the_active_state, the_authctxt);
1.423 djm 2210: if (use_privsep && privsep_is_preauth &&
2211: pmonitor != NULL && pmonitor->m_pid > 1) {
1.386 djm 2212: debug("Killing privsep child %d", pmonitor->m_pid);
2213: if (kill(pmonitor->m_pid, SIGKILL) != 0 &&
1.388 djm 2214: errno != ESRCH)
1.386 djm 2215: error("%s: kill(%d): %s", __func__,
2216: pmonitor->m_pid, strerror(errno));
2217: }
2218: }
1.278 markus 2219: _exit(i);
1.1 deraadt 2220: }
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