Annotation of src/usr.bin/ssh/sshd.c, Revision 1.281
1.86 markus 1: /*
1.65 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.126 deraadt 5: * This program is the ssh daemon. It listens for connections from clients,
6: * and performs authentication, executes use commands or shell, and forwards
1.65 deraadt 7: * information to/from the application to the user client over an encrypted
1.126 deraadt 8: * connection. This can also handle forwarding of X11, TCP/IP, and
9: * authentication agent connections.
1.98 markus 10: *
1.126 deraadt 11: * As far as I am concerned, the code I have written for this software
12: * can be used freely for any purpose. Any derived versions of this
13: * software must be clearly marked as such, and if the derived work is
14: * incompatible with the protocol description in the RFC file, it must be
15: * called by a name other than "ssh" or "Secure Shell".
16: *
17: * SSH2 implementation:
1.231 provos 18: * Privilege Separation:
1.126 deraadt 19: *
1.231 provos 20: * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved.
21: * Copyright (c) 2002 Niels Provos. All rights reserved.
1.126 deraadt 22: *
23: * Redistribution and use in source and binary forms, with or without
24: * modification, are permitted provided that the following conditions
25: * are met:
26: * 1. Redistributions of source code must retain the above copyright
27: * notice, this list of conditions and the following disclaimer.
28: * 2. Redistributions in binary form must reproduce the above copyright
29: * notice, this list of conditions and the following disclaimer in the
30: * documentation and/or other materials provided with the distribution.
31: *
32: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
33: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
34: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
35: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
36: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
37: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
41: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.65 deraadt 42: */
1.1 deraadt 43:
44: #include "includes.h"
1.281 ! jakob 45: RCSID("$OpenBSD: sshd.c,v 1.280 2003/10/02 10:41:59 markus Exp $");
1.1 deraadt 46:
1.155 markus 47: #include <openssl/dh.h>
48: #include <openssl/bn.h>
1.226 markus 49: #include <openssl/md5.h>
1.231 provos 50: #include <openssl/rand.h>
1.155 markus 51:
52: #include "ssh.h"
53: #include "ssh1.h"
54: #include "ssh2.h"
1.1 deraadt 55: #include "xmalloc.h"
56: #include "rsa.h"
1.171 djm 57: #include "sshpty.h"
1.1 deraadt 58: #include "packet.h"
59: #include "mpaux.h"
1.155 markus 60: #include "log.h"
1.1 deraadt 61: #include "servconf.h"
62: #include "uidswap.h"
1.33 markus 63: #include "compat.h"
1.96 markus 64: #include "buffer.h"
1.155 markus 65: #include "cipher.h"
1.98 markus 66: #include "kex.h"
1.96 markus 67: #include "key.h"
1.129 provos 68: #include "dh.h"
1.98 markus 69: #include "myproposal.h"
1.108 markus 70: #include "authfile.h"
1.154 markus 71: #include "pathnames.h"
1.155 markus 72: #include "atomicio.h"
73: #include "canohost.h"
74: #include "auth.h"
75: #include "misc.h"
1.186 markus 76: #include "dispatch.h"
1.206 stevesk 77: #include "channels.h"
1.230 provos 78: #include "session.h"
1.231 provos 79: #include "monitor_mm.h"
80: #include "monitor.h"
81: #include "monitor_wrap.h"
82: #include "monitor_fdpass.h"
1.1 deraadt 83:
84: #ifdef LIBWRAP
85: #include <tcpd.h>
86: #include <syslog.h>
87: int allow_severity = LOG_INFO;
88: int deny_severity = LOG_WARNING;
89: #endif /* LIBWRAP */
90:
91: #ifndef O_NOCTTY
92: #define O_NOCTTY 0
93: #endif
94:
1.138 markus 95: extern char *__progname;
96:
1.1 deraadt 97: /* Server configuration options. */
98: ServerOptions options;
99:
100: /* Name of the server configuration file. */
1.154 markus 101: char *config_file_name = _PATH_SERVER_CONFIG_FILE;
1.1 deraadt 102:
1.105 markus 103: /*
1.75 markus 104: * Flag indicating whether IPv4 or IPv6. This can be set on the command line.
105: * Default value is AF_UNSPEC means both IPv4 and IPv6.
106: */
107: int IPv4or6 = AF_UNSPEC;
108:
1.65 deraadt 109: /*
110: * Debug mode flag. This can be set on the command line. If debug
111: * mode is enabled, extra debugging output will be sent to the system
112: * log, the daemon will not go to background, and will exit after processing
113: * the first connection.
114: */
1.1 deraadt 115: int debug_flag = 0;
116:
1.203 stevesk 117: /* Flag indicating that the daemon should only test the configuration and keys. */
118: int test_flag = 0;
119:
1.1 deraadt 120: /* Flag indicating that the daemon is being started from inetd. */
121: int inetd_flag = 0;
122:
1.135 markus 123: /* Flag indicating that sshd should not detach and become a daemon. */
124: int no_daemon_flag = 0;
125:
1.47 markus 126: /* debug goes to stderr unless inetd_flag is set */
127: int log_stderr = 0;
128:
1.1 deraadt 129: /* Saved arguments to main(). */
130: char **saved_argv;
131:
1.66 markus 132: /*
1.75 markus 133: * The sockets that the server is listening; this is used in the SIGHUP
134: * signal handler.
1.66 markus 135: */
1.75 markus 136: #define MAX_LISTEN_SOCKS 16
137: int listen_socks[MAX_LISTEN_SOCKS];
138: int num_listen_socks = 0;
1.1 deraadt 139:
1.66 markus 140: /*
141: * the client's version string, passed by sshd2 in compat mode. if != NULL,
142: * sshd will skip the version-number exchange
143: */
1.61 markus 144: char *client_version_string = NULL;
1.96 markus 145: char *server_version_string = NULL;
1.1 deraadt 146:
1.189 markus 147: /* for rekeying XXX fixme */
148: Kex *xxx_kex;
149:
1.66 markus 150: /*
151: * Any really sensitive data in the application is contained in this
152: * structure. The idea is that this structure could be locked into memory so
153: * that the pages do not get written into swap. However, there are some
154: * problems. The private key contains BIGNUMs, and we do not (in principle)
155: * have access to the internals of them, and locking just the structure is
156: * not very useful. Currently, memory locking is not implemented.
157: */
1.64 markus 158: struct {
1.174 deraadt 159: Key *server_key; /* ephemeral server key */
1.134 markus 160: Key *ssh1_host_key; /* ssh1 host key */
161: Key **host_keys; /* all private host keys */
162: int have_ssh1_key;
163: int have_ssh2_key;
1.169 markus 164: u_char ssh1_cookie[SSH_SESSION_KEY_LENGTH];
1.1 deraadt 165: } sensitive_data;
166:
1.66 markus 167: /*
1.151 markus 168: * Flag indicating whether the RSA server key needs to be regenerated.
169: * Is set in the SIGALRM handler and cleared when the key is regenerated.
1.66 markus 170: */
1.212 markus 171: static volatile sig_atomic_t key_do_regen = 0;
1.1 deraadt 172:
1.199 markus 173: /* This is set to true when a signal is received. */
1.212 markus 174: static volatile sig_atomic_t received_sighup = 0;
175: static volatile sig_atomic_t received_sigterm = 0;
1.1 deraadt 176:
1.96 markus 177: /* session identifier, used by RSA-auth */
1.140 markus 178: u_char session_id[16];
1.96 markus 179:
1.108 markus 180: /* same for ssh2 */
1.140 markus 181: u_char *session_id2 = NULL;
1.269 markus 182: u_int session_id2_len = 0;
1.108 markus 183:
1.125 markus 184: /* record remote hostname or ip */
1.140 markus 185: u_int utmp_len = MAXHOSTNAMELEN;
1.125 markus 186:
1.211 markus 187: /* options.max_startup sized array of fd ints */
188: int *startup_pipes = NULL;
189: int startup_pipe; /* in child */
190:
1.231 provos 191: /* variables used for privilege separation */
1.263 markus 192: int use_privsep;
193: struct monitor *pmonitor;
1.231 provos 194:
1.278 markus 195: /* global authentication context */
196: Authctxt *the_authctxt = NULL;
197:
1.1 deraadt 198: /* Prototypes for various functions defined later in this file. */
1.200 itojun 199: void destroy_sensitive_data(void);
1.231 provos 200: void demote_sensitive_data(void);
1.87 markus 201:
1.200 itojun 202: static void do_ssh1_kex(void);
203: static void do_ssh2_kex(void);
1.129 provos 204:
1.87 markus 205: /*
1.75 markus 206: * Close all listening sockets
207: */
1.200 itojun 208: static void
1.75 markus 209: close_listen_socks(void)
210: {
211: int i;
1.250 deraadt 212:
1.75 markus 213: for (i = 0; i < num_listen_socks; i++)
214: close(listen_socks[i]);
215: num_listen_socks = -1;
216: }
217:
1.211 markus 218: static void
219: close_startup_pipes(void)
220: {
221: int i;
1.250 deraadt 222:
1.211 markus 223: if (startup_pipes)
224: for (i = 0; i < options.max_startups; i++)
225: if (startup_pipes[i] != -1)
226: close(startup_pipes[i]);
227: }
228:
1.75 markus 229: /*
1.65 deraadt 230: * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP;
231: * the effect is to reread the configuration file (and to regenerate
232: * the server key).
233: */
1.200 itojun 234: static void
1.64 markus 235: sighup_handler(int sig)
1.1 deraadt 236: {
1.210 deraadt 237: int save_errno = errno;
238:
1.64 markus 239: received_sighup = 1;
240: signal(SIGHUP, sighup_handler);
1.210 deraadt 241: errno = save_errno;
1.1 deraadt 242: }
243:
1.65 deraadt 244: /*
245: * Called from the main program after receiving SIGHUP.
246: * Restarts the server.
247: */
1.200 itojun 248: static void
1.165 itojun 249: sighup_restart(void)
1.1 deraadt 250: {
1.264 itojun 251: logit("Received SIGHUP; restarting.");
1.75 markus 252: close_listen_socks();
1.211 markus 253: close_startup_pipes();
1.64 markus 254: execv(saved_argv[0], saved_argv);
1.264 itojun 255: logit("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0],
1.250 deraadt 256: strerror(errno));
1.64 markus 257: exit(1);
1.1 deraadt 258: }
259:
1.65 deraadt 260: /*
261: * Generic signal handler for terminating signals in the master daemon.
262: */
1.200 itojun 263: static void
1.64 markus 264: sigterm_handler(int sig)
1.1 deraadt 265: {
1.199 markus 266: received_sigterm = sig;
1.1 deraadt 267: }
268:
1.65 deraadt 269: /*
270: * SIGCHLD handler. This is called whenever a child dies. This will then
1.199 markus 271: * reap any zombies left by exited children.
1.65 deraadt 272: */
1.200 itojun 273: static void
1.64 markus 274: main_sigchld_handler(int sig)
1.1 deraadt 275: {
1.250 deraadt 276: int save_errno = errno;
1.239 markus 277: pid_t pid;
1.64 markus 278: int status;
1.60 deraadt 279:
1.239 markus 280: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
281: (pid < 0 && errno == EINTR))
1.64 markus 282: ;
1.60 deraadt 283:
1.64 markus 284: signal(SIGCHLD, main_sigchld_handler);
285: errno = save_errno;
1.1 deraadt 286: }
287:
1.65 deraadt 288: /*
289: * Signal handler for the alarm after the login grace period has expired.
290: */
1.200 itojun 291: static void
1.64 markus 292: grace_alarm_handler(int sig)
1.1 deraadt 293: {
1.199 markus 294: /* XXX no idea how fix this signal handler */
295:
1.64 markus 296: /* Log error and exit. */
1.259 markus 297: fatal("Timeout before authentication for %s", get_remote_ipaddr());
1.62 markus 298: }
299:
1.65 deraadt 300: /*
301: * Signal handler for the key regeneration alarm. Note that this
302: * alarm only occurs in the daemon waiting for connections, and it does not
303: * do anything with the private key or random state before forking.
304: * Thus there should be no concurrency control/asynchronous execution
305: * problems.
306: */
1.200 itojun 307: static void
1.174 deraadt 308: generate_ephemeral_server_key(void)
1.134 markus 309: {
1.254 deraadt 310: u_int32_t rnd = 0;
1.169 markus 311: int i;
312:
1.191 markus 313: verbose("Generating %s%d bit RSA key.",
1.185 djm 314: sensitive_data.server_key ? "new " : "", options.server_key_bits);
1.134 markus 315: if (sensitive_data.server_key != NULL)
316: key_free(sensitive_data.server_key);
1.191 markus 317: sensitive_data.server_key = key_generate(KEY_RSA1,
1.185 djm 318: options.server_key_bits);
319: verbose("RSA key generation complete.");
1.169 markus 320:
321: for (i = 0; i < SSH_SESSION_KEY_LENGTH; i++) {
322: if (i % 4 == 0)
1.254 deraadt 323: rnd = arc4random();
324: sensitive_data.ssh1_cookie[i] = rnd & 0xff;
325: rnd >>= 8;
1.169 markus 326: }
1.134 markus 327: arc4random_stir();
328: }
1.147 deraadt 329:
1.200 itojun 330: static void
1.64 markus 331: key_regeneration_alarm(int sig)
1.1 deraadt 332: {
1.64 markus 333: int save_errno = errno;
1.250 deraadt 334:
1.151 markus 335: signal(SIGALRM, SIG_DFL);
1.64 markus 336: errno = save_errno;
1.151 markus 337: key_do_regen = 1;
1.98 markus 338: }
339:
1.200 itojun 340: static void
1.96 markus 341: sshd_exchange_identification(int sock_in, int sock_out)
342: {
1.102 markus 343: int i, mismatch;
1.96 markus 344: int remote_major, remote_minor;
1.102 markus 345: int major, minor;
1.96 markus 346: char *s;
347: char buf[256]; /* Must not be larger than remote_version. */
348: char remote_version[256]; /* Must be at least as big as buf. */
349:
1.103 markus 350: if ((options.protocol & SSH_PROTO_1) &&
351: (options.protocol & SSH_PROTO_2)) {
1.102 markus 352: major = PROTOCOL_MAJOR_1;
353: minor = 99;
354: } else if (options.protocol & SSH_PROTO_2) {
355: major = PROTOCOL_MAJOR_2;
356: minor = PROTOCOL_MINOR_2;
357: } else {
358: major = PROTOCOL_MAJOR_1;
359: minor = PROTOCOL_MINOR_1;
360: }
361: snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", major, minor, SSH_VERSION);
1.96 markus 362: server_version_string = xstrdup(buf);
363:
1.272 markus 364: /* Send our protocol version identification. */
365: if (atomicio(vwrite, sock_out, server_version_string,
366: strlen(server_version_string))
367: != strlen(server_version_string)) {
368: logit("Could not write ident string to %s", get_remote_ipaddr());
1.278 markus 369: cleanup_exit(255);
1.272 markus 370: }
371:
372: /* Read other sides version identification. */
373: memset(buf, 0, sizeof(buf));
374: for (i = 0; i < sizeof(buf) - 1; i++) {
375: if (atomicio(read, sock_in, &buf[i], 1) != 1) {
376: logit("Did not receive identification string from %s",
377: get_remote_ipaddr());
1.278 markus 378: cleanup_exit(255);
1.96 markus 379: }
1.272 markus 380: if (buf[i] == '\r') {
381: buf[i] = 0;
382: /* Kludge for F-Secure Macintosh < 1.0.2 */
383: if (i == 12 &&
384: strncmp(buf, "SSH-1.5-W1.0", 12) == 0)
1.96 markus 385: break;
1.272 markus 386: continue;
387: }
388: if (buf[i] == '\n') {
389: buf[i] = 0;
390: break;
1.96 markus 391: }
392: }
1.272 markus 393: buf[sizeof(buf) - 1] = 0;
394: client_version_string = xstrdup(buf);
1.96 markus 395:
396: /*
397: * Check that the versions match. In future this might accept
398: * several versions and set appropriate flags to handle them.
399: */
400: if (sscanf(client_version_string, "SSH-%d.%d-%[^\n]\n",
401: &remote_major, &remote_minor, remote_version) != 3) {
1.105 markus 402: s = "Protocol mismatch.\n";
1.271 deraadt 403: (void) atomicio(vwrite, sock_out, s, strlen(s));
1.96 markus 404: close(sock_in);
405: close(sock_out);
1.264 itojun 406: logit("Bad protocol version identification '%.100s' from %s",
1.96 markus 407: client_version_string, get_remote_ipaddr());
1.278 markus 408: cleanup_exit(255);
1.96 markus 409: }
410: debug("Client protocol version %d.%d; client software version %.100s",
1.217 deraadt 411: remote_major, remote_minor, remote_version);
1.96 markus 412:
1.98 markus 413: compat_datafellows(remote_version);
1.260 mickey 414:
415: if (datafellows & SSH_BUG_PROBE) {
1.264 itojun 416: logit("probed from %s with %s. Don't panic.",
1.260 mickey 417: get_remote_ipaddr(), client_version_string);
1.278 markus 418: cleanup_exit(255);
1.260 mickey 419: }
1.175 deraadt 420:
421: if (datafellows & SSH_BUG_SCANNER) {
1.264 itojun 422: logit("scanned from %s with %s. Don't panic.",
1.175 deraadt 423: get_remote_ipaddr(), client_version_string);
1.278 markus 424: cleanup_exit(255);
1.175 deraadt 425: }
1.98 markus 426:
1.102 markus 427: mismatch = 0;
1.214 deraadt 428: switch (remote_major) {
1.96 markus 429: case 1:
1.108 markus 430: if (remote_minor == 99) {
431: if (options.protocol & SSH_PROTO_2)
432: enable_compat20();
433: else
434: mismatch = 1;
435: break;
436: }
1.102 markus 437: if (!(options.protocol & SSH_PROTO_1)) {
438: mismatch = 1;
439: break;
440: }
1.96 markus 441: if (remote_minor < 3) {
1.121 provos 442: packet_disconnect("Your ssh version is too old and "
1.96 markus 443: "is no longer supported. Please install a newer version.");
444: } else if (remote_minor == 3) {
445: /* note that this disables agent-forwarding */
446: enable_compat13();
447: }
1.102 markus 448: break;
1.98 markus 449: case 2:
1.102 markus 450: if (options.protocol & SSH_PROTO_2) {
1.98 markus 451: enable_compat20();
452: break;
453: }
1.99 markus 454: /* FALLTHROUGH */
1.105 markus 455: default:
1.102 markus 456: mismatch = 1;
457: break;
458: }
459: chop(server_version_string);
460: debug("Local version string %.200s", server_version_string);
461:
462: if (mismatch) {
1.96 markus 463: s = "Protocol major versions differ.\n";
1.271 deraadt 464: (void) atomicio(vwrite, sock_out, s, strlen(s));
1.96 markus 465: close(sock_in);
466: close(sock_out);
1.264 itojun 467: logit("Protocol major versions differ for %s: %.200s vs. %.200s",
1.102 markus 468: get_remote_ipaddr(),
469: server_version_string, client_version_string);
1.278 markus 470: cleanup_exit(255);
1.96 markus 471: }
1.108 markus 472: }
473:
1.134 markus 474: /* Destroy the host and server keys. They will no longer be needed. */
1.108 markus 475: void
476: destroy_sensitive_data(void)
477: {
1.134 markus 478: int i;
479:
480: if (sensitive_data.server_key) {
481: key_free(sensitive_data.server_key);
482: sensitive_data.server_key = NULL;
483: }
1.217 deraadt 484: for (i = 0; i < options.num_host_key_files; i++) {
1.134 markus 485: if (sensitive_data.host_keys[i]) {
486: key_free(sensitive_data.host_keys[i]);
487: sensitive_data.host_keys[i] = NULL;
488: }
489: }
490: sensitive_data.ssh1_host_key = NULL;
1.169 markus 491: memset(sensitive_data.ssh1_cookie, 0, SSH_SESSION_KEY_LENGTH);
1.134 markus 492: }
493:
1.231 provos 494: /* Demote private to public keys for network child */
495: void
496: demote_sensitive_data(void)
497: {
498: Key *tmp;
499: int i;
500:
501: if (sensitive_data.server_key) {
502: tmp = key_demote(sensitive_data.server_key);
503: key_free(sensitive_data.server_key);
504: sensitive_data.server_key = tmp;
505: }
506:
507: for (i = 0; i < options.num_host_key_files; i++) {
508: if (sensitive_data.host_keys[i]) {
509: tmp = key_demote(sensitive_data.host_keys[i]);
510: key_free(sensitive_data.host_keys[i]);
511: sensitive_data.host_keys[i] = tmp;
512: if (tmp->type == KEY_RSA1)
513: sensitive_data.ssh1_host_key = tmp;
514: }
515: }
516:
517: /* We do not clear ssh1_host key and cookie. XXX - Okay Niels? */
518: }
519:
1.233 markus 520: static void
1.231 provos 521: privsep_preauth_child(void)
522: {
1.254 deraadt 523: u_int32_t rnd[256];
1.253 deraadt 524: gid_t gidset[1];
1.250 deraadt 525: struct passwd *pw;
1.231 provos 526: int i;
527:
528: /* Enable challenge-response authentication for privilege separation */
529: privsep_challenge_enable();
530:
531: for (i = 0; i < 256; i++)
1.254 deraadt 532: rnd[i] = arc4random();
533: RAND_seed(rnd, sizeof(rnd));
1.231 provos 534:
535: /* Demote the private keys to public keys. */
536: demote_sensitive_data();
537:
1.235 stevesk 538: if ((pw = getpwnam(SSH_PRIVSEP_USER)) == NULL)
1.240 djm 539: fatal("Privilege separation user %s does not exist",
540: SSH_PRIVSEP_USER);
1.235 stevesk 541: memset(pw->pw_passwd, 0, strlen(pw->pw_passwd));
542: endpwent();
543:
1.255 deraadt 544: /* Change our root directory */
1.232 stevesk 545: if (chroot(_PATH_PRIVSEP_CHROOT_DIR) == -1)
546: fatal("chroot(\"%s\"): %s", _PATH_PRIVSEP_CHROOT_DIR,
547: strerror(errno));
1.231 provos 548: if (chdir("/") == -1)
1.236 stevesk 549: fatal("chdir(\"/\"): %s", strerror(errno));
1.234 markus 550:
1.231 provos 551: /* Drop our privileges */
1.235 stevesk 552: debug3("privsep user:group %u:%u", (u_int)pw->pw_uid,
553: (u_int)pw->pw_gid);
1.251 markus 554: #if 0
555: /* XXX not ready, to heavy after chroot */
1.235 stevesk 556: do_setusercontext(pw);
1.251 markus 557: #else
558: gidset[0] = pw->pw_gid;
559: if (setgroups(1, gidset) < 0)
560: fatal("setgroups: %.100s", strerror(errno));
561: permanently_set_uid(pw);
562: #endif
1.231 provos 563: }
564:
1.278 markus 565: static int
566: privsep_preauth(Authctxt *authctxt)
1.237 markus 567: {
568: int status;
569: pid_t pid;
570:
571: /* Set up unprivileged child process to deal with network data */
1.242 mouring 572: pmonitor = monitor_init();
1.237 markus 573: /* Store a pointer to the kex for later rekeying */
1.242 mouring 574: pmonitor->m_pkex = &xxx_kex;
1.237 markus 575:
576: pid = fork();
577: if (pid == -1) {
578: fatal("fork of unprivileged child failed");
579: } else if (pid != 0) {
1.245 mpech 580: debug2("Network child is on pid %ld", (long)pid);
1.237 markus 581:
1.242 mouring 582: close(pmonitor->m_recvfd);
1.278 markus 583: monitor_child_preauth(authctxt, pmonitor);
1.242 mouring 584: close(pmonitor->m_sendfd);
1.237 markus 585:
586: /* Sync memory */
1.242 mouring 587: monitor_sync(pmonitor);
1.237 markus 588:
589: /* Wait for the child's exit status */
1.239 markus 590: while (waitpid(pid, &status, 0) < 0)
591: if (errno != EINTR)
592: break;
1.278 markus 593: return (1);
1.237 markus 594: } else {
595: /* child */
596:
1.242 mouring 597: close(pmonitor->m_sendfd);
1.237 markus 598:
599: /* Demote the child */
600: if (getuid() == 0 || geteuid() == 0)
601: privsep_preauth_child();
1.238 stevesk 602: setproctitle("%s", "[net]");
1.237 markus 603: }
1.278 markus 604: return (0);
1.237 markus 605: }
606:
1.233 markus 607: static void
1.237 markus 608: privsep_postauth(Authctxt *authctxt)
1.231 provos 609: {
610: if (authctxt->pw->pw_uid == 0 || options.use_login) {
611: /* File descriptor passing is broken or root login */
1.242 mouring 612: monitor_apply_keystate(pmonitor);
1.231 provos 613: use_privsep = 0;
614: return;
615: }
1.234 markus 616:
1.231 provos 617: /* Authentication complete */
618: alarm(0);
619: if (startup_pipe != -1) {
620: close(startup_pipe);
621: startup_pipe = -1;
622: }
623:
624: /* New socket pair */
1.242 mouring 625: monitor_reinit(pmonitor);
1.231 provos 626:
1.242 mouring 627: pmonitor->m_pid = fork();
628: if (pmonitor->m_pid == -1)
1.231 provos 629: fatal("fork of unprivileged child failed");
1.242 mouring 630: else if (pmonitor->m_pid != 0) {
1.245 mpech 631: debug2("User child is on pid %ld", (long)pmonitor->m_pid);
1.242 mouring 632: close(pmonitor->m_recvfd);
633: monitor_child_postauth(pmonitor);
1.231 provos 634:
635: /* NEVERREACHED */
636: exit(0);
637: }
638:
1.242 mouring 639: close(pmonitor->m_sendfd);
1.231 provos 640:
641: /* Demote the private keys to public keys. */
642: demote_sensitive_data();
643:
644: /* Drop privileges */
645: do_setusercontext(authctxt->pw);
646:
647: /* It is safe now to apply the key state */
1.242 mouring 648: monitor_apply_keystate(pmonitor);
1.231 provos 649: }
650:
1.200 itojun 651: static char *
1.134 markus 652: list_hostkey_types(void)
653: {
1.223 markus 654: Buffer b;
1.281 ! jakob 655: const char *p;
! 656: char *ret;
1.134 markus 657: int i;
1.223 markus 658:
659: buffer_init(&b);
1.217 deraadt 660: for (i = 0; i < options.num_host_key_files; i++) {
1.134 markus 661: Key *key = sensitive_data.host_keys[i];
662: if (key == NULL)
663: continue;
1.214 deraadt 664: switch (key->type) {
1.134 markus 665: case KEY_RSA:
666: case KEY_DSA:
1.223 markus 667: if (buffer_len(&b) > 0)
668: buffer_append(&b, ",", 1);
669: p = key_ssh_name(key);
670: buffer_append(&b, p, strlen(p));
1.134 markus 671: break;
672: }
673: }
1.223 markus 674: buffer_append(&b, "\0", 1);
1.281 ! jakob 675: ret = xstrdup(buffer_ptr(&b));
1.223 markus 676: buffer_free(&b);
1.281 ! jakob 677: debug("list_hostkey_types: %s", ret);
! 678: return ret;
1.134 markus 679: }
680:
1.231 provos 681: Key *
1.134 markus 682: get_hostkey_by_type(int type)
683: {
684: int i;
1.250 deraadt 685:
1.217 deraadt 686: for (i = 0; i < options.num_host_key_files; i++) {
1.134 markus 687: Key *key = sensitive_data.host_keys[i];
688: if (key != NULL && key->type == type)
689: return key;
690: }
691: return NULL;
1.96 markus 692: }
693:
1.231 provos 694: Key *
695: get_hostkey_by_index(int ind)
696: {
697: if (ind < 0 || ind >= options.num_host_key_files)
698: return (NULL);
699: return (sensitive_data.host_keys[ind]);
700: }
701:
702: int
703: get_hostkey_index(Key *key)
704: {
705: int i;
1.250 deraadt 706:
1.231 provos 707: for (i = 0; i < options.num_host_key_files; i++) {
708: if (key == sensitive_data.host_keys[i])
709: return (i);
710: }
711: return (-1);
712: }
713:
1.124 markus 714: /*
715: * returns 1 if connection should be dropped, 0 otherwise.
716: * dropping starts at connection #max_startups_begin with a probability
717: * of (max_startups_rate/100). the probability increases linearly until
718: * all connections are dropped for startups > max_startups
719: */
1.200 itojun 720: static int
1.124 markus 721: drop_connection(int startups)
722: {
723: double p, r;
724:
725: if (startups < options.max_startups_begin)
726: return 0;
727: if (startups >= options.max_startups)
728: return 1;
729: if (options.max_startups_rate == 100)
730: return 1;
731:
732: p = 100 - options.max_startups_rate;
733: p *= startups - options.max_startups_begin;
734: p /= (double) (options.max_startups - options.max_startups_begin);
735: p += options.max_startups_rate;
736: p /= 100.0;
737: r = arc4random() / (double) UINT_MAX;
738:
739: debug("drop_connection: p %g, r %g", p, r);
740: return (r < p) ? 1 : 0;
741: }
742:
1.215 markus 743: static void
744: usage(void)
745: {
1.280 markus 746: fprintf(stderr, "sshd version %s, %s\n",
747: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.215 markus 748: fprintf(stderr, "Usage: %s [options]\n", __progname);
749: fprintf(stderr, "Options:\n");
750: fprintf(stderr, " -f file Configuration file (default %s)\n", _PATH_SERVER_CONFIG_FILE);
751: fprintf(stderr, " -d Debugging mode (multiple -d means more debugging)\n");
752: fprintf(stderr, " -i Started from inetd\n");
753: fprintf(stderr, " -D Do not fork into daemon mode\n");
754: fprintf(stderr, " -t Only test configuration file and keys\n");
755: fprintf(stderr, " -q Quiet (no logging)\n");
756: fprintf(stderr, " -p port Listen on the specified port (default: 22)\n");
757: fprintf(stderr, " -k seconds Regenerate server key every this many seconds (default: 3600)\n");
758: fprintf(stderr, " -g seconds Grace period for authentication (default: 600)\n");
759: fprintf(stderr, " -b bits Size of server RSA key (default: 768 bits)\n");
760: fprintf(stderr, " -h file File from which to read host key (default: %s)\n",
761: _PATH_HOST_KEY_FILE);
762: fprintf(stderr, " -u len Maximum hostname length for utmp recording\n");
763: fprintf(stderr, " -4 Use IPv4 only\n");
764: fprintf(stderr, " -6 Use IPv6 only\n");
765: fprintf(stderr, " -o option Process the option as if it was read from a configuration file.\n");
766: exit(1);
767: }
768:
1.65 deraadt 769: /*
770: * Main program for the daemon.
771: */
1.2 provos 772: int
773: main(int ac, char **av)
1.1 deraadt 774: {
1.64 markus 775: extern char *optarg;
776: extern int optind;
1.120 markus 777: int opt, sock_in = 0, sock_out = 0, newsock, j, i, fdsetsz, on = 1;
1.107 deraadt 778: pid_t pid;
1.75 markus 779: socklen_t fromlen;
780: fd_set *fdset;
781: struct sockaddr_storage from;
1.64 markus 782: const char *remote_ip;
783: int remote_port;
784: FILE *f;
1.75 markus 785: struct addrinfo *ai;
786: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
787: int listen_sock, maxfd;
1.120 markus 788: int startup_p[2];
789: int startups = 0;
1.278 markus 790: Key *key;
1.230 provos 791: Authctxt *authctxt;
1.151 markus 792: int ret, key_used = 0;
1.64 markus 793:
1.138 markus 794: /* Save argv. */
1.64 markus 795: saved_argv = av;
796:
797: /* Initialize configuration options to their default values. */
798: initialize_server_options(&options);
799:
800: /* Parse command-line arguments. */
1.272 markus 801: while ((opt = getopt(ac, av, "f:p:b:k:h:g:u:o:dDeiqtQ46")) != -1) {
1.64 markus 802: switch (opt) {
1.75 markus 803: case '4':
804: IPv4or6 = AF_INET;
805: break;
806: case '6':
807: IPv4or6 = AF_INET6;
808: break;
1.64 markus 809: case 'f':
810: config_file_name = optarg;
811: break;
812: case 'd':
1.273 markus 813: if (debug_flag == 0) {
1.127 markus 814: debug_flag = 1;
815: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.273 markus 816: } else if (options.log_level < SYSLOG_LEVEL_DEBUG3)
1.127 markus 817: options.log_level++;
1.64 markus 818: break;
1.135 markus 819: case 'D':
820: no_daemon_flag = 1;
1.192 lebel 821: break;
822: case 'e':
823: log_stderr = 1;
1.135 markus 824: break;
1.64 markus 825: case 'i':
826: inetd_flag = 1;
827: break;
828: case 'Q':
1.158 markus 829: /* ignored */
1.64 markus 830: break;
831: case 'q':
832: options.log_level = SYSLOG_LEVEL_QUIET;
833: break;
834: case 'b':
835: options.server_key_bits = atoi(optarg);
836: break;
837: case 'p':
1.75 markus 838: options.ports_from_cmdline = 1;
1.127 markus 839: if (options.num_ports >= MAX_PORTS) {
840: fprintf(stderr, "too many ports.\n");
841: exit(1);
842: }
1.193 stevesk 843: options.ports[options.num_ports++] = a2port(optarg);
844: if (options.ports[options.num_ports-1] == 0) {
845: fprintf(stderr, "Bad port number.\n");
846: exit(1);
847: }
1.64 markus 848: break;
849: case 'g':
1.197 stevesk 850: if ((options.login_grace_time = convtime(optarg)) == -1) {
851: fprintf(stderr, "Invalid login grace time.\n");
852: exit(1);
853: }
1.64 markus 854: break;
855: case 'k':
1.197 stevesk 856: if ((options.key_regeneration_time = convtime(optarg)) == -1) {
857: fprintf(stderr, "Invalid key regeneration interval.\n");
858: exit(1);
859: }
1.64 markus 860: break;
861: case 'h':
1.134 markus 862: if (options.num_host_key_files >= MAX_HOSTKEYS) {
863: fprintf(stderr, "too many host keys.\n");
864: exit(1);
865: }
866: options.host_key_files[options.num_host_key_files++] = optarg;
1.64 markus 867: break;
1.203 stevesk 868: case 't':
869: test_flag = 1;
870: break;
1.125 markus 871: case 'u':
872: utmp_len = atoi(optarg);
1.257 stevesk 873: if (utmp_len > MAXHOSTNAMELEN) {
874: fprintf(stderr, "Invalid utmp length.\n");
875: exit(1);
876: }
1.125 markus 877: break;
1.215 markus 878: case 'o':
1.217 deraadt 879: if (process_server_config_line(&options, optarg,
1.215 markus 880: "command-line", 0) != 0)
1.217 deraadt 881: exit(1);
1.215 markus 882: break;
1.64 markus 883: case '?':
884: default:
1.215 markus 885: usage();
886: break;
1.64 markus 887: }
888: }
1.180 markus 889: SSLeay_add_all_algorithms();
1.205 markus 890: channel_set_af(IPv4or6);
1.64 markus 891:
1.75 markus 892: /*
893: * Force logging to stderr until we have loaded the private host
894: * key (unless started from inetd)
895: */
1.138 markus 896: log_init(__progname,
1.224 markus 897: options.log_level == SYSLOG_LEVEL_NOT_SET ?
898: SYSLOG_LEVEL_INFO : options.log_level,
899: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
900: SYSLOG_FACILITY_AUTH : options.log_facility,
1.261 markus 901: log_stderr || !inetd_flag);
1.75 markus 902:
1.64 markus 903: /* Read server configuration options from the configuration file. */
904: read_server_config(&options, config_file_name);
905:
906: /* Fill in default values for those options not explicitly set. */
907: fill_default_server_options(&options);
908:
909: /* Check that there are no remaining arguments. */
910: if (optind < ac) {
911: fprintf(stderr, "Extra argument %s.\n", av[optind]);
912: exit(1);
913: }
914:
915: debug("sshd version %.100s", SSH_VERSION);
916:
1.134 markus 917: /* load private host keys */
1.255 deraadt 918: sensitive_data.host_keys = xmalloc(options.num_host_key_files *
919: sizeof(Key *));
1.217 deraadt 920: for (i = 0; i < options.num_host_key_files; i++)
1.141 markus 921: sensitive_data.host_keys[i] = NULL;
1.134 markus 922: sensitive_data.server_key = NULL;
923: sensitive_data.ssh1_host_key = NULL;
924: sensitive_data.have_ssh1_key = 0;
925: sensitive_data.have_ssh2_key = 0;
926:
1.217 deraadt 927: for (i = 0; i < options.num_host_key_files; i++) {
1.179 markus 928: key = key_load_private(options.host_key_files[i], "", NULL);
929: sensitive_data.host_keys[i] = key;
1.134 markus 930: if (key == NULL) {
1.195 markus 931: error("Could not load host key: %s",
932: options.host_key_files[i]);
1.179 markus 933: sensitive_data.host_keys[i] = NULL;
1.134 markus 934: continue;
935: }
1.214 deraadt 936: switch (key->type) {
1.134 markus 937: case KEY_RSA1:
938: sensitive_data.ssh1_host_key = key;
939: sensitive_data.have_ssh1_key = 1;
940: break;
941: case KEY_RSA:
942: case KEY_DSA:
943: sensitive_data.have_ssh2_key = 1;
944: break;
945: }
1.179 markus 946: debug("private host key: #%d type %d %s", i, key->type,
947: key_type(key));
1.134 markus 948: }
949: if ((options.protocol & SSH_PROTO_1) && !sensitive_data.have_ssh1_key) {
1.264 itojun 950: logit("Disabling protocol version 1. Could not load host key");
1.108 markus 951: options.protocol &= ~SSH_PROTO_1;
952: }
1.134 markus 953: if ((options.protocol & SSH_PROTO_2) && !sensitive_data.have_ssh2_key) {
1.264 itojun 954: logit("Disabling protocol version 2. Could not load host key");
1.134 markus 955: options.protocol &= ~SSH_PROTO_2;
1.108 markus 956: }
1.162 stevesk 957: if (!(options.protocol & (SSH_PROTO_1|SSH_PROTO_2))) {
1.264 itojun 958: logit("sshd: no hostkeys available -- exiting.");
1.64 markus 959: exit(1);
960: }
961:
1.108 markus 962: /* Check certain values for sanity. */
963: if (options.protocol & SSH_PROTO_1) {
964: if (options.server_key_bits < 512 ||
965: options.server_key_bits > 32768) {
966: fprintf(stderr, "Bad server key size.\n");
967: exit(1);
968: }
969: /*
970: * Check that server and host key lengths differ sufficiently. This
971: * is necessary to make double encryption work with rsaref. Oh, I
972: * hate software patents. I dont know if this can go? Niels
973: */
974: if (options.server_key_bits >
1.250 deraadt 975: BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) -
976: SSH_KEY_BITS_RESERVED && options.server_key_bits <
977: BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) +
978: SSH_KEY_BITS_RESERVED) {
1.108 markus 979: options.server_key_bits =
1.250 deraadt 980: BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) +
981: SSH_KEY_BITS_RESERVED;
1.108 markus 982: debug("Forcing server key to %d bits to make it differ from host key.",
983: options.server_key_bits);
984: }
1.244 markus 985: }
986:
987: if (use_privsep) {
988: struct passwd *pw;
989: struct stat st;
990:
991: if ((pw = getpwnam(SSH_PRIVSEP_USER)) == NULL)
992: fatal("Privilege separation user %s does not exist",
993: SSH_PRIVSEP_USER);
994: if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) ||
995: (S_ISDIR(st.st_mode) == 0))
996: fatal("Missing privilege separation directory: %s",
1.247 stevesk 997: _PATH_PRIVSEP_CHROOT_DIR);
998: if (st.st_uid != 0 || (st.st_mode & (S_IWGRP|S_IWOTH)) != 0)
1.262 markus 999: fatal("%s must be owned by root and not group or "
1000: "world-writable.", _PATH_PRIVSEP_CHROOT_DIR);
1.108 markus 1001: }
1.203 stevesk 1002:
1003: /* Configuration looks good, so exit if in test mode. */
1004: if (test_flag)
1005: exit(0);
1.108 markus 1006:
1007: /* Initialize the log (it is reinitialized below in case we forked). */
1.64 markus 1008: if (debug_flag && !inetd_flag)
1009: log_stderr = 1;
1.138 markus 1010: log_init(__progname, options.log_level, options.log_facility, log_stderr);
1.64 markus 1011:
1.108 markus 1012: /*
1013: * If not in debugging mode, and not started from inetd, disconnect
1014: * from the controlling terminal, and fork. The original process
1015: * exits.
1016: */
1.135 markus 1017: if (!(debug_flag || inetd_flag || no_daemon_flag)) {
1.1 deraadt 1018: #ifdef TIOCNOTTY
1.64 markus 1019: int fd;
1.1 deraadt 1020: #endif /* TIOCNOTTY */
1.64 markus 1021: if (daemon(0, 0) < 0)
1022: fatal("daemon() failed: %.200s", strerror(errno));
1023:
1024: /* Disconnect from the controlling tty. */
1.1 deraadt 1025: #ifdef TIOCNOTTY
1.165 itojun 1026: fd = open(_PATH_TTY, O_RDWR | O_NOCTTY);
1.64 markus 1027: if (fd >= 0) {
1028: (void) ioctl(fd, TIOCNOTTY, NULL);
1029: close(fd);
1030: }
1031: #endif /* TIOCNOTTY */
1032: }
1033: /* Reinitialize the log (because of the fork above). */
1.138 markus 1034: log_init(__progname, options.log_level, options.log_facility, log_stderr);
1.64 markus 1035:
1036: /* Initialize the random number generator. */
1037: arc4random_stir();
1038:
1039: /* Chdir to the root directory so that the current disk can be
1040: unmounted if desired. */
1041: chdir("/");
1.217 deraadt 1042:
1.178 markus 1043: /* ignore SIGPIPE */
1044: signal(SIGPIPE, SIG_IGN);
1.64 markus 1045:
1046: /* Start listening for a socket, unless started from inetd. */
1047: if (inetd_flag) {
1.194 markus 1048: int s1;
1.64 markus 1049: s1 = dup(0); /* Make sure descriptors 0, 1, and 2 are in use. */
1.194 markus 1050: dup(s1);
1.64 markus 1051: sock_in = dup(0);
1052: sock_out = dup(1);
1.123 djm 1053: startup_pipe = -1;
1.108 markus 1054: /*
1055: * We intentionally do not close the descriptors 0, 1, and 2
1056: * as our code for setting the descriptors won\'t work if
1057: * ttyfd happens to be one of those.
1058: */
1.64 markus 1059: debug("inetd sockets after dupping: %d, %d", sock_in, sock_out);
1.134 markus 1060: if (options.protocol & SSH_PROTO_1)
1.174 deraadt 1061: generate_ephemeral_server_key();
1.64 markus 1062: } else {
1.75 markus 1063: for (ai = options.listen_addrs; ai; ai = ai->ai_next) {
1064: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
1065: continue;
1066: if (num_listen_socks >= MAX_LISTEN_SOCKS)
1067: fatal("Too many listen sockets. "
1068: "Enlarge MAX_LISTEN_SOCKS");
1069: if (getnameinfo(ai->ai_addr, ai->ai_addrlen,
1070: ntop, sizeof(ntop), strport, sizeof(strport),
1071: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1072: error("getnameinfo failed");
1073: continue;
1074: }
1075: /* Create socket for listening. */
1.265 markus 1076: listen_sock = socket(ai->ai_family, ai->ai_socktype,
1077: ai->ai_protocol);
1.75 markus 1078: if (listen_sock < 0) {
1079: /* kernel may not support ipv6 */
1080: verbose("socket: %.100s", strerror(errno));
1081: continue;
1082: }
1083: /*
1.258 stevesk 1084: * Set socket options.
1085: * Allow local port reuse in TIME_WAIT.
1.75 markus 1086: */
1.258 stevesk 1087: if (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR,
1088: &on, sizeof(on)) == -1)
1089: error("setsockopt SO_REUSEADDR: %s", strerror(errno));
1.75 markus 1090:
1091: debug("Bind to port %s on %s.", strport, ntop);
1092:
1093: /* Bind the socket to the desired port. */
1094: if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1095: error("Bind to port %s on %s failed: %.200s.",
1096: strport, ntop, strerror(errno));
1097: close(listen_sock);
1098: continue;
1099: }
1100: listen_socks[num_listen_socks] = listen_sock;
1101: num_listen_socks++;
1102:
1103: /* Start listening on the port. */
1.264 itojun 1104: logit("Server listening on %s port %s.", ntop, strport);
1.75 markus 1105: if (listen(listen_sock, 5) < 0)
1106: fatal("listen: %.100s", strerror(errno));
1107:
1.64 markus 1108: }
1.75 markus 1109: freeaddrinfo(options.listen_addrs);
1110:
1111: if (!num_listen_socks)
1112: fatal("Cannot bind any address.");
1113:
1.201 markus 1114: if (options.protocol & SSH_PROTO_1)
1115: generate_ephemeral_server_key();
1116:
1117: /*
1118: * Arrange to restart on SIGHUP. The handler needs
1119: * listen_sock.
1120: */
1121: signal(SIGHUP, sighup_handler);
1122:
1123: signal(SIGTERM, sigterm_handler);
1124: signal(SIGQUIT, sigterm_handler);
1125:
1126: /* Arrange SIGCHLD to be caught. */
1127: signal(SIGCHLD, main_sigchld_handler);
1128:
1129: /* Write out the pid file after the sigterm handler is setup */
1.64 markus 1130: if (!debug_flag) {
1.66 markus 1131: /*
1.136 todd 1132: * Record our pid in /var/run/sshd.pid to make it
1133: * easier to kill the correct sshd. We don't want to
1134: * do this before the bind above because the bind will
1.66 markus 1135: * fail if there already is a daemon, and this will
1136: * overwrite any old pid in the file.
1137: */
1.112 markus 1138: f = fopen(options.pid_file, "w");
1.270 djm 1139: if (f == NULL) {
1140: error("Couldn't create pid file \"%s\": %s",
1141: options.pid_file, strerror(errno));
1142: } else {
1.245 mpech 1143: fprintf(f, "%ld\n", (long) getpid());
1.64 markus 1144: fclose(f);
1145: }
1146: }
1147:
1.75 markus 1148: /* setup fd set for listen */
1.120 markus 1149: fdset = NULL;
1.75 markus 1150: maxfd = 0;
1151: for (i = 0; i < num_listen_socks; i++)
1152: if (listen_socks[i] > maxfd)
1153: maxfd = listen_socks[i];
1.120 markus 1154: /* pipes connected to unauthenticated childs */
1155: startup_pipes = xmalloc(options.max_startups * sizeof(int));
1156: for (i = 0; i < options.max_startups; i++)
1157: startup_pipes[i] = -1;
1.75 markus 1158:
1.66 markus 1159: /*
1160: * Stay listening for connections until the system crashes or
1161: * the daemon is killed with a signal.
1162: */
1.64 markus 1163: for (;;) {
1164: if (received_sighup)
1165: sighup_restart();
1.120 markus 1166: if (fdset != NULL)
1167: xfree(fdset);
1.148 markus 1168: fdsetsz = howmany(maxfd+1, NFDBITS) * sizeof(fd_mask);
1.120 markus 1169: fdset = (fd_set *)xmalloc(fdsetsz);
1.75 markus 1170: memset(fdset, 0, fdsetsz);
1.120 markus 1171:
1.75 markus 1172: for (i = 0; i < num_listen_socks; i++)
1173: FD_SET(listen_socks[i], fdset);
1.120 markus 1174: for (i = 0; i < options.max_startups; i++)
1175: if (startup_pipes[i] != -1)
1176: FD_SET(startup_pipes[i], fdset);
1177:
1178: /* Wait in select until there is a connection. */
1.151 markus 1179: ret = select(maxfd+1, fdset, NULL, NULL, NULL);
1180: if (ret < 0 && errno != EINTR)
1181: error("select: %.100s", strerror(errno));
1.199 markus 1182: if (received_sigterm) {
1.264 itojun 1183: logit("Received signal %d; terminating.",
1.213 itojun 1184: (int) received_sigterm);
1.199 markus 1185: close_listen_socks();
1186: unlink(options.pid_file);
1187: exit(255);
1188: }
1.151 markus 1189: if (key_used && key_do_regen) {
1.174 deraadt 1190: generate_ephemeral_server_key();
1.151 markus 1191: key_used = 0;
1192: key_do_regen = 0;
1193: }
1194: if (ret < 0)
1.75 markus 1195: continue;
1.151 markus 1196:
1.120 markus 1197: for (i = 0; i < options.max_startups; i++)
1198: if (startup_pipes[i] != -1 &&
1199: FD_ISSET(startup_pipes[i], fdset)) {
1200: /*
1201: * the read end of the pipe is ready
1202: * if the child has closed the pipe
1.143 markus 1203: * after successful authentication
1.120 markus 1204: * or if the child has died
1205: */
1206: close(startup_pipes[i]);
1207: startup_pipes[i] = -1;
1208: startups--;
1209: }
1.75 markus 1210: for (i = 0; i < num_listen_socks; i++) {
1211: if (!FD_ISSET(listen_socks[i], fdset))
1.70 provos 1212: continue;
1.120 markus 1213: fromlen = sizeof(from);
1214: newsock = accept(listen_socks[i], (struct sockaddr *)&from,
1215: &fromlen);
1216: if (newsock < 0) {
1217: if (errno != EINTR && errno != EWOULDBLOCK)
1218: error("accept: %.100s", strerror(errno));
1219: continue;
1220: }
1.124 markus 1221: if (drop_connection(startups) == 1) {
1222: debug("drop connection #%d", startups);
1.120 markus 1223: close(newsock);
1224: continue;
1225: }
1226: if (pipe(startup_p) == -1) {
1227: close(newsock);
1228: continue;
1229: }
1230:
1231: for (j = 0; j < options.max_startups; j++)
1232: if (startup_pipes[j] == -1) {
1233: startup_pipes[j] = startup_p[0];
1234: if (maxfd < startup_p[0])
1235: maxfd = startup_p[0];
1236: startups++;
1237: break;
1238: }
1.161 stevesk 1239:
1.66 markus 1240: /*
1.120 markus 1241: * Got connection. Fork a child to handle it, unless
1242: * we are in debugging mode.
1.66 markus 1243: */
1.120 markus 1244: if (debug_flag) {
1.66 markus 1245: /*
1.120 markus 1246: * In debugging mode. Close the listening
1247: * socket, and start processing the
1248: * connection without forking.
1.66 markus 1249: */
1.120 markus 1250: debug("Server will not fork when running in debugging mode.");
1.75 markus 1251: close_listen_socks();
1.64 markus 1252: sock_in = newsock;
1253: sock_out = newsock;
1.122 deraadt 1254: startup_pipe = -1;
1.120 markus 1255: pid = getpid();
1.64 markus 1256: break;
1.120 markus 1257: } else {
1258: /*
1259: * Normal production daemon. Fork, and have
1260: * the child process the connection. The
1261: * parent continues listening.
1262: */
1263: if ((pid = fork()) == 0) {
1264: /*
1265: * Child. Close the listening and max_startup
1266: * sockets. Start using the accepted socket.
1267: * Reinitialize logging (since our pid has
1268: * changed). We break out of the loop to handle
1269: * the connection.
1270: */
1271: startup_pipe = startup_p[1];
1.211 markus 1272: close_startup_pipes();
1.120 markus 1273: close_listen_socks();
1274: sock_in = newsock;
1275: sock_out = newsock;
1.138 markus 1276: log_init(__progname, options.log_level, options.log_facility, log_stderr);
1.120 markus 1277: break;
1278: }
1.64 markus 1279: }
1280:
1.120 markus 1281: /* Parent. Stay in the loop. */
1282: if (pid < 0)
1283: error("fork: %.100s", strerror(errno));
1284: else
1.245 mpech 1285: debug("Forked child %ld.", (long)pid);
1.120 markus 1286:
1287: close(startup_p[1]);
1.1 deraadt 1288:
1.120 markus 1289: /* Mark that the key has been used (it was "given" to the child). */
1.151 markus 1290: if ((options.protocol & SSH_PROTO_1) &&
1291: key_used == 0) {
1292: /* Schedule server key regeneration alarm. */
1293: signal(SIGALRM, key_regeneration_alarm);
1294: alarm(options.key_regeneration_time);
1295: key_used = 1;
1296: }
1.1 deraadt 1297:
1.120 markus 1298: arc4random_stir();
1.1 deraadt 1299:
1.120 markus 1300: /* Close the new socket (the child is now taking care of it). */
1301: close(newsock);
1302: }
1.75 markus 1303: /* child process check (or debug mode) */
1304: if (num_listen_socks < 0)
1305: break;
1.64 markus 1306: }
1.1 deraadt 1307: }
1308:
1.64 markus 1309: /* This is the child processing a new connection. */
1.241 millert 1310:
1311: /*
1312: * Create a new session and process group since the 4.4BSD
1313: * setlogin() affects the entire process group. We don't
1314: * want the child to be able to affect the parent.
1315: */
1.248 stevesk 1316: if (!debug_flag && !inetd_flag && setsid() < 0)
1.241 millert 1317: error("setsid: %.100s", strerror(errno));
1.64 markus 1318:
1.66 markus 1319: /*
1320: * Disable the key regeneration alarm. We will not regenerate the
1321: * key since we are no longer in a position to give it to anyone. We
1322: * will not restart on SIGHUP since it no longer makes sense.
1323: */
1.64 markus 1324: alarm(0);
1325: signal(SIGALRM, SIG_DFL);
1326: signal(SIGHUP, SIG_DFL);
1327: signal(SIGTERM, SIG_DFL);
1328: signal(SIGQUIT, SIG_DFL);
1329: signal(SIGCHLD, SIG_DFL);
1.150 markus 1330:
1331: /* Set keepalives if requested. */
1332: if (options.keepalives &&
1.228 stevesk 1333: setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on,
1.150 markus 1334: sizeof(on)) < 0)
1335: error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
1.64 markus 1336:
1.66 markus 1337: /*
1338: * Register our connection. This turns encryption off because we do
1339: * not have a key.
1340: */
1.64 markus 1341: packet_set_connection(sock_in, sock_out);
1.1 deraadt 1342:
1.64 markus 1343: remote_port = get_remote_port();
1344: remote_ip = get_remote_ipaddr();
1.52 markus 1345:
1.209 markus 1346: #ifdef LIBWRAP
1.64 markus 1347: /* Check whether logins are denied from this host. */
1348: {
1349: struct request_info req;
1.37 dugsong 1350:
1.204 camield 1351: request_init(&req, RQ_DAEMON, __progname, RQ_FILE, sock_in, 0);
1.64 markus 1352: fromhost(&req);
1.37 dugsong 1353:
1.64 markus 1354: if (!hosts_access(&req)) {
1.209 markus 1355: debug("Connection refused by tcp wrapper");
1.182 markus 1356: refuse(&req);
1.209 markus 1357: /* NOTREACHED */
1358: fatal("libwrap refuse returns");
1.64 markus 1359: }
1360: }
1.75 markus 1361: #endif /* LIBWRAP */
1.209 markus 1362:
1.64 markus 1363: /* Log the connection. */
1364: verbose("Connection from %.500s port %d", remote_ip, remote_port);
1.1 deraadt 1365:
1.66 markus 1366: /*
1367: * We don\'t want to listen forever unless the other side
1368: * successfully authenticates itself. So we set up an alarm which is
1369: * cleared after successful authentication. A limit of zero
1370: * indicates no limit. Note that we don\'t set the alarm in debugging
1371: * mode; it is just annoying to have the server exit just when you
1372: * are about to discover the bug.
1373: */
1.64 markus 1374: signal(SIGALRM, grace_alarm_handler);
1375: if (!debug_flag)
1376: alarm(options.login_grace_time);
1377:
1.96 markus 1378: sshd_exchange_identification(sock_in, sock_out);
1.275 markus 1379:
1.64 markus 1380: packet_set_nonblocking();
1.1 deraadt 1381:
1.278 markus 1382: /* allocate authentication context */
1383: authctxt = xmalloc(sizeof(*authctxt));
1384: memset(authctxt, 0, sizeof(*authctxt));
1385:
1386: /* XXX global for cleanup, access from other modules */
1387: the_authctxt = authctxt;
1388:
1.237 markus 1389: if (use_privsep)
1.278 markus 1390: if (privsep_preauth(authctxt) == 1)
1.237 markus 1391: goto authenticated;
1.231 provos 1392:
1.77 markus 1393: /* perform the key exchange */
1394: /* authenticate user and start session */
1.98 markus 1395: if (compat20) {
1396: do_ssh2_kex();
1.278 markus 1397: do_authentication2(authctxt);
1.98 markus 1398: } else {
1399: do_ssh1_kex();
1.278 markus 1400: do_authentication(authctxt);
1.98 markus 1401: }
1.237 markus 1402: /*
1403: * If we use privilege separation, the unprivileged child transfers
1404: * the current keystate and exits
1405: */
1406: if (use_privsep) {
1.242 mouring 1407: mm_send_keystate(pmonitor);
1.231 provos 1408: exit(0);
1.237 markus 1409: }
1.231 provos 1410:
1411: authenticated:
1.234 markus 1412: /*
1.231 provos 1413: * In privilege separation, we fork another child and prepare
1414: * file descriptor passing.
1415: */
1416: if (use_privsep) {
1.237 markus 1417: privsep_postauth(authctxt);
1418: /* the monitor process [priv] will not return */
1.231 provos 1419: if (!compat20)
1420: destroy_sensitive_data();
1421: }
1.230 provos 1422:
1.278 markus 1423: /* Start session. */
1.230 provos 1424: do_authenticated(authctxt);
1425:
1.64 markus 1426: /* The connection has been terminated. */
1427: verbose("Closing connection to %.100s", remote_ip);
1428: packet_close();
1.231 provos 1429:
1430: if (use_privsep)
1431: mm_terminate();
1432:
1.64 markus 1433: exit(0);
1.1 deraadt 1434: }
1435:
1.65 deraadt 1436: /*
1.229 markus 1437: * Decrypt session_key_int using our private server key and private host key
1438: * (key with larger modulus first).
1439: */
1.231 provos 1440: int
1.229 markus 1441: ssh1_session_key(BIGNUM *session_key_int)
1442: {
1443: int rsafail = 0;
1444:
1445: if (BN_cmp(sensitive_data.server_key->rsa->n, sensitive_data.ssh1_host_key->rsa->n) > 0) {
1446: /* Server key has bigger modulus. */
1447: if (BN_num_bits(sensitive_data.server_key->rsa->n) <
1448: BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
1449: fatal("do_connection: %s: server_key %d < host_key %d + SSH_KEY_BITS_RESERVED %d",
1450: get_remote_ipaddr(),
1451: BN_num_bits(sensitive_data.server_key->rsa->n),
1452: BN_num_bits(sensitive_data.ssh1_host_key->rsa->n),
1453: SSH_KEY_BITS_RESERVED);
1454: }
1455: if (rsa_private_decrypt(session_key_int, session_key_int,
1456: sensitive_data.server_key->rsa) <= 0)
1457: rsafail++;
1458: if (rsa_private_decrypt(session_key_int, session_key_int,
1459: sensitive_data.ssh1_host_key->rsa) <= 0)
1460: rsafail++;
1461: } else {
1462: /* Host key has bigger modulus (or they are equal). */
1463: if (BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) <
1464: BN_num_bits(sensitive_data.server_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
1465: fatal("do_connection: %s: host_key %d < server_key %d + SSH_KEY_BITS_RESERVED %d",
1466: get_remote_ipaddr(),
1467: BN_num_bits(sensitive_data.ssh1_host_key->rsa->n),
1468: BN_num_bits(sensitive_data.server_key->rsa->n),
1469: SSH_KEY_BITS_RESERVED);
1470: }
1471: if (rsa_private_decrypt(session_key_int, session_key_int,
1472: sensitive_data.ssh1_host_key->rsa) < 0)
1473: rsafail++;
1474: if (rsa_private_decrypt(session_key_int, session_key_int,
1475: sensitive_data.server_key->rsa) < 0)
1476: rsafail++;
1477: }
1478: return (rsafail);
1479: }
1480: /*
1.77 markus 1481: * SSH1 key exchange
1.65 deraadt 1482: */
1.200 itojun 1483: static void
1.142 markus 1484: do_ssh1_kex(void)
1.1 deraadt 1485: {
1.64 markus 1486: int i, len;
1.159 markus 1487: int rsafail = 0;
1.64 markus 1488: BIGNUM *session_key_int;
1.140 markus 1489: u_char session_key[SSH_SESSION_KEY_LENGTH];
1490: u_char cookie[8];
1491: u_int cipher_type, auth_mask, protocol_flags;
1.254 deraadt 1492: u_int32_t rnd = 0;
1.64 markus 1493:
1.66 markus 1494: /*
1495: * Generate check bytes that the client must send back in the user
1496: * packet in order for it to be accepted; this is used to defy ip
1497: * spoofing attacks. Note that this only works against somebody
1498: * doing IP spoofing from a remote machine; any machine on the local
1499: * network can still see outgoing packets and catch the random
1500: * cookie. This only affects rhosts authentication, and this is one
1501: * of the reasons why it is inherently insecure.
1502: */
1.64 markus 1503: for (i = 0; i < 8; i++) {
1504: if (i % 4 == 0)
1.254 deraadt 1505: rnd = arc4random();
1506: cookie[i] = rnd & 0xff;
1507: rnd >>= 8;
1.64 markus 1508: }
1509:
1.66 markus 1510: /*
1511: * Send our public key. We include in the packet 64 bits of random
1512: * data that must be matched in the reply in order to prevent IP
1513: * spoofing.
1514: */
1.64 markus 1515: packet_start(SSH_SMSG_PUBLIC_KEY);
1516: for (i = 0; i < 8; i++)
1.77 markus 1517: packet_put_char(cookie[i]);
1.64 markus 1518:
1519: /* Store our public server RSA key. */
1.134 markus 1520: packet_put_int(BN_num_bits(sensitive_data.server_key->rsa->n));
1521: packet_put_bignum(sensitive_data.server_key->rsa->e);
1522: packet_put_bignum(sensitive_data.server_key->rsa->n);
1.64 markus 1523:
1524: /* Store our public host RSA key. */
1.134 markus 1525: packet_put_int(BN_num_bits(sensitive_data.ssh1_host_key->rsa->n));
1526: packet_put_bignum(sensitive_data.ssh1_host_key->rsa->e);
1527: packet_put_bignum(sensitive_data.ssh1_host_key->rsa->n);
1.64 markus 1528:
1529: /* Put protocol flags. */
1530: packet_put_int(SSH_PROTOFLAG_HOST_IN_FWD_OPEN);
1531:
1532: /* Declare which ciphers we support. */
1.131 markus 1533: packet_put_int(cipher_mask_ssh1(0));
1.64 markus 1534:
1535: /* Declare supported authentication types. */
1536: auth_mask = 0;
1537: if (options.rhosts_rsa_authentication)
1538: auth_mask |= 1 << SSH_AUTH_RHOSTS_RSA;
1539: if (options.rsa_authentication)
1540: auth_mask |= 1 << SSH_AUTH_RSA;
1.196 markus 1541: if (options.challenge_response_authentication == 1)
1.64 markus 1542: auth_mask |= 1 << SSH_AUTH_TIS;
1543: if (options.password_authentication)
1544: auth_mask |= 1 << SSH_AUTH_PASSWORD;
1545: packet_put_int(auth_mask);
1546:
1547: /* Send the packet and wait for it to be sent. */
1548: packet_send();
1549: packet_write_wait();
1550:
1.134 markus 1551: debug("Sent %d bit server key and %d bit host key.",
1552: BN_num_bits(sensitive_data.server_key->rsa->n),
1553: BN_num_bits(sensitive_data.ssh1_host_key->rsa->n));
1.64 markus 1554:
1555: /* Read clients reply (cipher type and session key). */
1.222 markus 1556: packet_read_expect(SSH_CMSG_SESSION_KEY);
1.64 markus 1557:
1.69 markus 1558: /* Get cipher type and check whether we accept this. */
1.64 markus 1559: cipher_type = packet_get_char();
1.69 markus 1560:
1.131 markus 1561: if (!(cipher_mask_ssh1(0) & (1 << cipher_type)))
1.69 markus 1562: packet_disconnect("Warning: client selects unsupported cipher.");
1.64 markus 1563:
1564: /* Get check bytes from the packet. These must match those we
1565: sent earlier with the public key packet. */
1566: for (i = 0; i < 8; i++)
1.77 markus 1567: if (cookie[i] != packet_get_char())
1.64 markus 1568: packet_disconnect("IP Spoofing check bytes do not match.");
1569:
1570: debug("Encryption type: %.200s", cipher_name(cipher_type));
1571:
1572: /* Get the encrypted integer. */
1.218 markus 1573: if ((session_key_int = BN_new()) == NULL)
1574: fatal("do_ssh1_kex: BN_new failed");
1.221 markus 1575: packet_get_bignum(session_key_int);
1.64 markus 1576:
1577: protocol_flags = packet_get_int();
1578: packet_set_protocol_flags(protocol_flags);
1.220 markus 1579: packet_check_eom();
1.64 markus 1580:
1.229 markus 1581: /* Decrypt session_key_int using host/server keys */
1.231 provos 1582: rsafail = PRIVSEP(ssh1_session_key(session_key_int));
1583:
1.66 markus 1584: /*
1585: * Extract session key from the decrypted integer. The key is in the
1586: * least significant 256 bits of the integer; the first byte of the
1587: * key is in the highest bits.
1588: */
1.159 markus 1589: if (!rsafail) {
1590: BN_mask_bits(session_key_int, sizeof(session_key) * 8);
1591: len = BN_num_bytes(session_key_int);
1592: if (len < 0 || len > sizeof(session_key)) {
1593: error("do_connection: bad session key len from %s: "
1.165 itojun 1594: "session_key_int %d > sizeof(session_key) %lu",
1595: get_remote_ipaddr(), len, (u_long)sizeof(session_key));
1.159 markus 1596: rsafail++;
1597: } else {
1598: memset(session_key, 0, sizeof(session_key));
1599: BN_bn2bin(session_key_int,
1600: session_key + sizeof(session_key) - len);
1.169 markus 1601:
1602: compute_session_id(session_id, cookie,
1603: sensitive_data.ssh1_host_key->rsa->n,
1604: sensitive_data.server_key->rsa->n);
1605: /*
1606: * Xor the first 16 bytes of the session key with the
1607: * session id.
1608: */
1609: for (i = 0; i < 16; i++)
1610: session_key[i] ^= session_id[i];
1.159 markus 1611: }
1612: }
1613: if (rsafail) {
1.169 markus 1614: int bytes = BN_num_bytes(session_key_int);
1.227 stevesk 1615: u_char *buf = xmalloc(bytes);
1.169 markus 1616: MD5_CTX md;
1617:
1.264 itojun 1618: logit("do_connection: generating a fake encryption key");
1.169 markus 1619: BN_bn2bin(session_key_int, buf);
1620: MD5_Init(&md);
1621: MD5_Update(&md, buf, bytes);
1622: MD5_Update(&md, sensitive_data.ssh1_cookie, SSH_SESSION_KEY_LENGTH);
1623: MD5_Final(session_key, &md);
1624: MD5_Init(&md);
1625: MD5_Update(&md, session_key, 16);
1626: MD5_Update(&md, buf, bytes);
1627: MD5_Update(&md, sensitive_data.ssh1_cookie, SSH_SESSION_KEY_LENGTH);
1628: MD5_Final(session_key + 16, &md);
1629: memset(buf, 0, bytes);
1630: xfree(buf);
1.170 markus 1631: for (i = 0; i < 16; i++)
1632: session_id[i] = session_key[i] ^ session_key[i + 16];
1.159 markus 1633: }
1.231 provos 1634: /* Destroy the private and public keys. No longer. */
1.169 markus 1635: destroy_sensitive_data();
1636:
1.231 provos 1637: if (use_privsep)
1638: mm_ssh1_session_id(session_id);
1639:
1.77 markus 1640: /* Destroy the decrypted integer. It is no longer needed. */
1641: BN_clear_free(session_key_int);
1.64 markus 1642:
1643: /* Set the session key. From this on all communications will be encrypted. */
1644: packet_set_encryption_key(session_key, SSH_SESSION_KEY_LENGTH, cipher_type);
1645:
1646: /* Destroy our copy of the session key. It is no longer needed. */
1647: memset(session_key, 0, sizeof(session_key));
1648:
1649: debug("Received session key; encryption turned on.");
1650:
1.243 deraadt 1651: /* Send an acknowledgment packet. Note that this packet is sent encrypted. */
1.64 markus 1652: packet_start(SSH_SMSG_SUCCESS);
1653: packet_send();
1654: packet_write_wait();
1.98 markus 1655: }
1656:
1657: /*
1658: * SSH2 key exchange: diffie-hellman-group1-sha1
1659: */
1.200 itojun 1660: static void
1.142 markus 1661: do_ssh2_kex(void)
1.98 markus 1662: {
1663: Kex *kex;
1.102 markus 1664:
1665: if (options.ciphers != NULL) {
1.105 markus 1666: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
1.102 markus 1667: myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
1.166 markus 1668: }
1.184 stevesk 1669: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
1670: compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
1671: myproposal[PROPOSAL_ENC_ALGS_STOC] =
1672: compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]);
1673:
1.166 markus 1674: if (options.macs != NULL) {
1675: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
1676: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
1.246 markus 1677: }
1678: if (!options.compression) {
1679: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
1680: myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
1.102 markus 1681: }
1.134 markus 1682: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = list_hostkey_types();
1683:
1.189 markus 1684: /* start key exchange */
1.188 markus 1685: kex = kex_setup(myproposal);
1.263 markus 1686: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1687: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1.186 markus 1688: kex->server = 1;
1689: kex->client_version_string=client_version_string;
1690: kex->server_version_string=server_version_string;
1691: kex->load_host_key=&get_hostkey_by_type;
1.231 provos 1692: kex->host_key_index=&get_hostkey_index;
1.129 provos 1693:
1.189 markus 1694: xxx_kex = kex;
1695:
1.190 markus 1696: dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
1.187 markus 1697:
1698: session_id2 = kex->session_id;
1699: session_id2_len = kex->session_id_len;
1.129 provos 1700:
1701: #ifdef DEBUG_KEXDH
1702: /* send 1st encrypted/maced/compressed message */
1703: packet_start(SSH2_MSG_IGNORE);
1704: packet_put_cstring("markus");
1705: packet_send();
1706: packet_write_wait();
1707: #endif
1.186 markus 1708: debug("KEX done");
1.278 markus 1709: }
1710:
1711: /* server specific fatal cleanup */
1712: void
1713: cleanup_exit(int i)
1714: {
1715: if (the_authctxt)
1716: do_cleanup(the_authctxt);
1717: _exit(i);
1.1 deraadt 1718: }
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