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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * This program is the ssh daemon. It listens for connections from clients, | |
6 | * and performs authentication, executes use commands or shell, and forwards | |
7 | * information to/from the application to the user client over an encrypted | |
8 | * connection. This can also handle forwarding of X11, TCP/IP, and | |
9 | * authentication agent connections. | |
10 | * | |
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: | |
510132b6 | 18 | * Privilege Separation: |
3c0ef626 | 19 | * |
510132b6 | 20 | * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved. |
21 | * Copyright (c) 2002 Niels Provos. All rights reserved. | |
3c0ef626 | 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. | |
42 | */ | |
43 | ||
44 | #include "includes.h" | |
dfddba3d | 45 | RCSID("$OpenBSD: sshd.c,v 1.308 2005/02/08 22:24:57 dtucker Exp $"); |
3c0ef626 | 46 | |
47 | #include <openssl/dh.h> | |
48 | #include <openssl/bn.h> | |
1e608e42 | 49 | #include <openssl/md5.h> |
510132b6 | 50 | #include <openssl/rand.h> |
51 | #ifdef HAVE_SECUREWARE | |
52 | #include <sys/security.h> | |
53 | #include <prot.h> | |
54 | #endif | |
3c0ef626 | 55 | |
56 | #include "ssh.h" | |
57 | #include "ssh1.h" | |
58 | #include "ssh2.h" | |
59 | #include "xmalloc.h" | |
60 | #include "rsa.h" | |
61 | #include "sshpty.h" | |
62 | #include "packet.h" | |
3c0ef626 | 63 | #include "log.h" |
64 | #include "servconf.h" | |
65 | #include "uidswap.h" | |
66 | #include "compat.h" | |
67 | #include "buffer.h" | |
7e82606e | 68 | #include "bufaux.h" |
3c0ef626 | 69 | #include "cipher.h" |
70 | #include "kex.h" | |
71 | #include "key.h" | |
72 | #include "dh.h" | |
73 | #include "myproposal.h" | |
74 | #include "authfile.h" | |
75 | #include "pathnames.h" | |
76 | #include "atomicio.h" | |
77 | #include "canohost.h" | |
78 | #include "auth.h" | |
79 | #include "misc.h" | |
7e82606e | 80 | #include "msg.h" |
3c0ef626 | 81 | #include "dispatch.h" |
82 | #include "channels.h" | |
510132b6 | 83 | #include "session.h" |
84 | #include "monitor_mm.h" | |
85 | #include "monitor.h" | |
86 | #include "monitor_wrap.h" | |
87 | #include "monitor_fdpass.h" | |
3c0ef626 | 88 | |
5598e598 | 89 | #ifdef GSSAPI |
90 | #include "ssh-gss.h" | |
91 | #endif | |
92 | ||
0b582e46 | 93 | #ifdef GSSAPI |
94 | #include <openssl/md5.h> | |
95 | #include "bufaux.h" | |
96 | #endif /* GSSAPI */ | |
0b582e46 | 97 | |
3c0ef626 | 98 | #ifdef LIBWRAP |
99 | #include <tcpd.h> | |
100 | #include <syslog.h> | |
101 | int allow_severity = LOG_INFO; | |
102 | int deny_severity = LOG_WARNING; | |
103 | #endif /* LIBWRAP */ | |
104 | ||
105 | #ifndef O_NOCTTY | |
106 | #define O_NOCTTY 0 | |
107 | #endif | |
108 | ||
7e82606e | 109 | /* Re-exec fds */ |
110 | #define REEXEC_DEVCRYPTO_RESERVED_FD (STDERR_FILENO + 1) | |
111 | #define REEXEC_STARTUP_PIPE_FD (STDERR_FILENO + 2) | |
112 | #define REEXEC_CONFIG_PASS_FD (STDERR_FILENO + 3) | |
113 | #define REEXEC_MIN_FREE_FD (STDERR_FILENO + 4) | |
114 | ||
3c0ef626 | 115 | extern char *__progname; |
3c0ef626 | 116 | |
117 | /* Server configuration options. */ | |
118 | ServerOptions options; | |
119 | ||
120 | /* Name of the server configuration file. */ | |
121 | char *config_file_name = _PATH_SERVER_CONFIG_FILE; | |
122 | ||
3c0ef626 | 123 | /* |
124 | * Debug mode flag. This can be set on the command line. If debug | |
125 | * mode is enabled, extra debugging output will be sent to the system | |
126 | * log, the daemon will not go to background, and will exit after processing | |
127 | * the first connection. | |
128 | */ | |
129 | int debug_flag = 0; | |
130 | ||
131 | /* Flag indicating that the daemon should only test the configuration and keys. */ | |
132 | int test_flag = 0; | |
133 | ||
134 | /* Flag indicating that the daemon is being started from inetd. */ | |
135 | int inetd_flag = 0; | |
136 | ||
137 | /* Flag indicating that sshd should not detach and become a daemon. */ | |
138 | int no_daemon_flag = 0; | |
139 | ||
140 | /* debug goes to stderr unless inetd_flag is set */ | |
141 | int log_stderr = 0; | |
142 | ||
143 | /* Saved arguments to main(). */ | |
144 | char **saved_argv; | |
145 | int saved_argc; | |
146 | ||
7e82606e | 147 | /* re-exec */ |
148 | int rexeced_flag = 0; | |
149 | int rexec_flag = 1; | |
150 | int rexec_argc = 0; | |
151 | char **rexec_argv; | |
152 | ||
3c0ef626 | 153 | /* |
154 | * The sockets that the server is listening; this is used in the SIGHUP | |
155 | * signal handler. | |
156 | */ | |
157 | #define MAX_LISTEN_SOCKS 16 | |
158 | int listen_socks[MAX_LISTEN_SOCKS]; | |
159 | int num_listen_socks = 0; | |
160 | ||
161 | /* | |
162 | * the client's version string, passed by sshd2 in compat mode. if != NULL, | |
163 | * sshd will skip the version-number exchange | |
164 | */ | |
165 | char *client_version_string = NULL; | |
166 | char *server_version_string = NULL; | |
167 | ||
168 | /* for rekeying XXX fixme */ | |
169 | Kex *xxx_kex; | |
170 | ||
171 | /* | |
172 | * Any really sensitive data in the application is contained in this | |
173 | * structure. The idea is that this structure could be locked into memory so | |
174 | * that the pages do not get written into swap. However, there are some | |
175 | * problems. The private key contains BIGNUMs, and we do not (in principle) | |
176 | * have access to the internals of them, and locking just the structure is | |
177 | * not very useful. Currently, memory locking is not implemented. | |
178 | */ | |
179 | struct { | |
180 | Key *server_key; /* ephemeral server key */ | |
181 | Key *ssh1_host_key; /* ssh1 host key */ | |
182 | Key **host_keys; /* all private host keys */ | |
183 | int have_ssh1_key; | |
184 | int have_ssh2_key; | |
185 | u_char ssh1_cookie[SSH_SESSION_KEY_LENGTH]; | |
186 | } sensitive_data; | |
187 | ||
188 | /* | |
189 | * Flag indicating whether the RSA server key needs to be regenerated. | |
190 | * Is set in the SIGALRM handler and cleared when the key is regenerated. | |
191 | */ | |
1e608e42 | 192 | static volatile sig_atomic_t key_do_regen = 0; |
3c0ef626 | 193 | |
194 | /* This is set to true when a signal is received. */ | |
1e608e42 | 195 | static volatile sig_atomic_t received_sighup = 0; |
196 | static volatile sig_atomic_t received_sigterm = 0; | |
3c0ef626 | 197 | |
198 | /* session identifier, used by RSA-auth */ | |
199 | u_char session_id[16]; | |
200 | ||
201 | /* same for ssh2 */ | |
202 | u_char *session_id2 = NULL; | |
7cac2b65 | 203 | u_int session_id2_len = 0; |
3c0ef626 | 204 | |
205 | /* record remote hostname or ip */ | |
206 | u_int utmp_len = MAXHOSTNAMELEN; | |
207 | ||
1e608e42 | 208 | /* options.max_startup sized array of fd ints */ |
209 | int *startup_pipes = NULL; | |
210 | int startup_pipe; /* in child */ | |
211 | ||
510132b6 | 212 | /* variables used for privilege separation */ |
bfe49944 | 213 | int use_privsep; |
540d72c3 | 214 | struct monitor *pmonitor = NULL; |
510132b6 | 215 | |
540d72c3 | 216 | /* global authentication context */ |
217 | Authctxt *the_authctxt = NULL; | |
218 | ||
7e82606e | 219 | /* message to be displayed after login */ |
220 | Buffer loginmsg; | |
221 | ||
3c0ef626 | 222 | /* Prototypes for various functions defined later in this file. */ |
223 | void destroy_sensitive_data(void); | |
510132b6 | 224 | void demote_sensitive_data(void); |
3c0ef626 | 225 | |
226 | static void do_ssh1_kex(void); | |
227 | static void do_ssh2_kex(void); | |
228 | ||
229 | /* | |
230 | * Close all listening sockets | |
231 | */ | |
232 | static void | |
233 | close_listen_socks(void) | |
234 | { | |
235 | int i; | |
276b07a3 | 236 | |
3c0ef626 | 237 | for (i = 0; i < num_listen_socks; i++) |
238 | close(listen_socks[i]); | |
239 | num_listen_socks = -1; | |
240 | } | |
241 | ||
1e608e42 | 242 | static void |
243 | close_startup_pipes(void) | |
244 | { | |
245 | int i; | |
276b07a3 | 246 | |
1e608e42 | 247 | if (startup_pipes) |
248 | for (i = 0; i < options.max_startups; i++) | |
249 | if (startup_pipes[i] != -1) | |
250 | close(startup_pipes[i]); | |
251 | } | |
252 | ||
3c0ef626 | 253 | /* |
254 | * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP; | |
255 | * the effect is to reread the configuration file (and to regenerate | |
256 | * the server key). | |
257 | */ | |
258 | static void | |
259 | sighup_handler(int sig) | |
260 | { | |
1e608e42 | 261 | int save_errno = errno; |
262 | ||
3c0ef626 | 263 | received_sighup = 1; |
264 | signal(SIGHUP, sighup_handler); | |
1e608e42 | 265 | errno = save_errno; |
3c0ef626 | 266 | } |
267 | ||
268 | /* | |
269 | * Called from the main program after receiving SIGHUP. | |
270 | * Restarts the server. | |
271 | */ | |
272 | static void | |
273 | sighup_restart(void) | |
274 | { | |
7cac2b65 | 275 | logit("Received SIGHUP; restarting."); |
3c0ef626 | 276 | close_listen_socks(); |
1e608e42 | 277 | close_startup_pipes(); |
3c0ef626 | 278 | execv(saved_argv[0], saved_argv); |
7cac2b65 | 279 | logit("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0], |
276b07a3 | 280 | strerror(errno)); |
3c0ef626 | 281 | exit(1); |
282 | } | |
283 | ||
284 | /* | |
285 | * Generic signal handler for terminating signals in the master daemon. | |
286 | */ | |
287 | static void | |
288 | sigterm_handler(int sig) | |
289 | { | |
290 | received_sigterm = sig; | |
291 | } | |
292 | ||
293 | /* | |
294 | * SIGCHLD handler. This is called whenever a child dies. This will then | |
295 | * reap any zombies left by exited children. | |
296 | */ | |
297 | static void | |
298 | main_sigchld_handler(int sig) | |
299 | { | |
300 | int save_errno = errno; | |
276b07a3 | 301 | pid_t pid; |
3c0ef626 | 302 | int status; |
303 | ||
510132b6 | 304 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
305 | (pid < 0 && errno == EINTR)) | |
3c0ef626 | 306 | ; |
307 | ||
308 | signal(SIGCHLD, main_sigchld_handler); | |
309 | errno = save_errno; | |
310 | } | |
311 | ||
312 | /* | |
313 | * Signal handler for the alarm after the login grace period has expired. | |
314 | */ | |
315 | static void | |
316 | grace_alarm_handler(int sig) | |
317 | { | |
318 | /* XXX no idea how fix this signal handler */ | |
319 | ||
540d72c3 | 320 | if (use_privsep && pmonitor != NULL && pmonitor->m_pid > 0) |
321 | kill(pmonitor->m_pid, SIGALRM); | |
322 | ||
3c0ef626 | 323 | /* Log error and exit. */ |
d03f4262 | 324 | fatal("Timeout before authentication for %s", get_remote_ipaddr()); |
3c0ef626 | 325 | } |
326 | ||
327 | /* | |
328 | * Signal handler for the key regeneration alarm. Note that this | |
329 | * alarm only occurs in the daemon waiting for connections, and it does not | |
330 | * do anything with the private key or random state before forking. | |
331 | * Thus there should be no concurrency control/asynchronous execution | |
332 | * problems. | |
333 | */ | |
334 | static void | |
335 | generate_ephemeral_server_key(void) | |
336 | { | |
d03f4262 | 337 | u_int32_t rnd = 0; |
3c0ef626 | 338 | int i; |
339 | ||
340 | verbose("Generating %s%d bit RSA key.", | |
341 | sensitive_data.server_key ? "new " : "", options.server_key_bits); | |
342 | if (sensitive_data.server_key != NULL) | |
343 | key_free(sensitive_data.server_key); | |
344 | sensitive_data.server_key = key_generate(KEY_RSA1, | |
345 | options.server_key_bits); | |
346 | verbose("RSA key generation complete."); | |
347 | ||
348 | for (i = 0; i < SSH_SESSION_KEY_LENGTH; i++) { | |
349 | if (i % 4 == 0) | |
d03f4262 | 350 | rnd = arc4random(); |
351 | sensitive_data.ssh1_cookie[i] = rnd & 0xff; | |
352 | rnd >>= 8; | |
3c0ef626 | 353 | } |
354 | arc4random_stir(); | |
355 | } | |
356 | ||
357 | static void | |
358 | key_regeneration_alarm(int sig) | |
359 | { | |
360 | int save_errno = errno; | |
276b07a3 | 361 | |
3c0ef626 | 362 | signal(SIGALRM, SIG_DFL); |
363 | errno = save_errno; | |
364 | key_do_regen = 1; | |
365 | } | |
366 | ||
367 | static void | |
368 | sshd_exchange_identification(int sock_in, int sock_out) | |
369 | { | |
370 | int i, mismatch; | |
371 | int remote_major, remote_minor; | |
372 | int major, minor; | |
373 | char *s; | |
374 | char buf[256]; /* Must not be larger than remote_version. */ | |
375 | char remote_version[256]; /* Must be at least as big as buf. */ | |
376 | ||
377 | if ((options.protocol & SSH_PROTO_1) && | |
378 | (options.protocol & SSH_PROTO_2)) { | |
379 | major = PROTOCOL_MAJOR_1; | |
380 | minor = 99; | |
381 | } else if (options.protocol & SSH_PROTO_2) { | |
382 | major = PROTOCOL_MAJOR_2; | |
383 | minor = PROTOCOL_MINOR_2; | |
384 | } else { | |
385 | major = PROTOCOL_MAJOR_1; | |
386 | minor = PROTOCOL_MINOR_1; | |
387 | } | |
388 | snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", major, minor, SSH_VERSION); | |
389 | server_version_string = xstrdup(buf); | |
390 | ||
7cac2b65 | 391 | /* Send our protocol version identification. */ |
392 | if (atomicio(vwrite, sock_out, server_version_string, | |
393 | strlen(server_version_string)) | |
394 | != strlen(server_version_string)) { | |
395 | logit("Could not write ident string to %s", get_remote_ipaddr()); | |
540d72c3 | 396 | cleanup_exit(255); |
7cac2b65 | 397 | } |
398 | ||
399 | /* Read other sides version identification. */ | |
400 | memset(buf, 0, sizeof(buf)); | |
401 | for (i = 0; i < sizeof(buf) - 1; i++) { | |
402 | if (atomicio(read, sock_in, &buf[i], 1) != 1) { | |
403 | logit("Did not receive identification string from %s", | |
404 | get_remote_ipaddr()); | |
540d72c3 | 405 | cleanup_exit(255); |
3c0ef626 | 406 | } |
7cac2b65 | 407 | if (buf[i] == '\r') { |
408 | buf[i] = 0; | |
409 | /* Kludge for F-Secure Macintosh < 1.0.2 */ | |
410 | if (i == 12 && | |
411 | strncmp(buf, "SSH-1.5-W1.0", 12) == 0) | |
3c0ef626 | 412 | break; |
7cac2b65 | 413 | continue; |
414 | } | |
415 | if (buf[i] == '\n') { | |
416 | buf[i] = 0; | |
417 | break; | |
3c0ef626 | 418 | } |
3c0ef626 | 419 | } |
7cac2b65 | 420 | buf[sizeof(buf) - 1] = 0; |
421 | client_version_string = xstrdup(buf); | |
3c0ef626 | 422 | |
423 | /* | |
424 | * Check that the versions match. In future this might accept | |
425 | * several versions and set appropriate flags to handle them. | |
426 | */ | |
427 | if (sscanf(client_version_string, "SSH-%d.%d-%[^\n]\n", | |
428 | &remote_major, &remote_minor, remote_version) != 3) { | |
429 | s = "Protocol mismatch.\n"; | |
7cac2b65 | 430 | (void) atomicio(vwrite, sock_out, s, strlen(s)); |
3c0ef626 | 431 | close(sock_in); |
432 | close(sock_out); | |
7cac2b65 | 433 | logit("Bad protocol version identification '%.100s' from %s", |
3c0ef626 | 434 | client_version_string, get_remote_ipaddr()); |
540d72c3 | 435 | cleanup_exit(255); |
3c0ef626 | 436 | } |
437 | debug("Client protocol version %d.%d; client software version %.100s", | |
1e608e42 | 438 | remote_major, remote_minor, remote_version); |
3c0ef626 | 439 | |
440 | compat_datafellows(remote_version); | |
441 | ||
d03f4262 | 442 | if (datafellows & SSH_BUG_PROBE) { |
7cac2b65 | 443 | logit("probed from %s with %s. Don't panic.", |
d03f4262 | 444 | get_remote_ipaddr(), client_version_string); |
540d72c3 | 445 | cleanup_exit(255); |
d03f4262 | 446 | } |
447 | ||
3c0ef626 | 448 | if (datafellows & SSH_BUG_SCANNER) { |
7cac2b65 | 449 | logit("scanned from %s with %s. Don't panic.", |
3c0ef626 | 450 | get_remote_ipaddr(), client_version_string); |
540d72c3 | 451 | cleanup_exit(255); |
3c0ef626 | 452 | } |
453 | ||
454 | mismatch = 0; | |
1e608e42 | 455 | switch (remote_major) { |
3c0ef626 | 456 | case 1: |
457 | if (remote_minor == 99) { | |
458 | if (options.protocol & SSH_PROTO_2) | |
459 | enable_compat20(); | |
460 | else | |
461 | mismatch = 1; | |
462 | break; | |
463 | } | |
464 | if (!(options.protocol & SSH_PROTO_1)) { | |
465 | mismatch = 1; | |
466 | break; | |
467 | } | |
468 | if (remote_minor < 3) { | |
469 | packet_disconnect("Your ssh version is too old and " | |
470 | "is no longer supported. Please install a newer version."); | |
471 | } else if (remote_minor == 3) { | |
472 | /* note that this disables agent-forwarding */ | |
473 | enable_compat13(); | |
474 | } | |
475 | break; | |
476 | case 2: | |
477 | if (options.protocol & SSH_PROTO_2) { | |
478 | enable_compat20(); | |
479 | break; | |
480 | } | |
481 | /* FALLTHROUGH */ | |
482 | default: | |
483 | mismatch = 1; | |
484 | break; | |
485 | } | |
486 | chop(server_version_string); | |
487 | debug("Local version string %.200s", server_version_string); | |
488 | ||
489 | if (mismatch) { | |
490 | s = "Protocol major versions differ.\n"; | |
7cac2b65 | 491 | (void) atomicio(vwrite, sock_out, s, strlen(s)); |
3c0ef626 | 492 | close(sock_in); |
493 | close(sock_out); | |
7cac2b65 | 494 | logit("Protocol major versions differ for %s: %.200s vs. %.200s", |
3c0ef626 | 495 | get_remote_ipaddr(), |
496 | server_version_string, client_version_string); | |
540d72c3 | 497 | cleanup_exit(255); |
3c0ef626 | 498 | } |
499 | } | |
500 | ||
3c0ef626 | 501 | /* Destroy the host and server keys. They will no longer be needed. */ |
502 | void | |
503 | destroy_sensitive_data(void) | |
504 | { | |
505 | int i; | |
506 | ||
507 | if (sensitive_data.server_key) { | |
508 | key_free(sensitive_data.server_key); | |
509 | sensitive_data.server_key = NULL; | |
510 | } | |
1e608e42 | 511 | for (i = 0; i < options.num_host_key_files; i++) { |
3c0ef626 | 512 | if (sensitive_data.host_keys[i]) { |
513 | key_free(sensitive_data.host_keys[i]); | |
514 | sensitive_data.host_keys[i] = NULL; | |
515 | } | |
516 | } | |
517 | sensitive_data.ssh1_host_key = NULL; | |
518 | memset(sensitive_data.ssh1_cookie, 0, SSH_SESSION_KEY_LENGTH); | |
519 | } | |
520 | ||
510132b6 | 521 | /* Demote private to public keys for network child */ |
522 | void | |
523 | demote_sensitive_data(void) | |
524 | { | |
525 | Key *tmp; | |
526 | int i; | |
527 | ||
528 | if (sensitive_data.server_key) { | |
529 | tmp = key_demote(sensitive_data.server_key); | |
530 | key_free(sensitive_data.server_key); | |
531 | sensitive_data.server_key = tmp; | |
532 | } | |
533 | ||
534 | for (i = 0; i < options.num_host_key_files; i++) { | |
535 | if (sensitive_data.host_keys[i]) { | |
536 | tmp = key_demote(sensitive_data.host_keys[i]); | |
537 | key_free(sensitive_data.host_keys[i]); | |
538 | sensitive_data.host_keys[i] = tmp; | |
539 | if (tmp->type == KEY_RSA1) | |
540 | sensitive_data.ssh1_host_key = tmp; | |
541 | } | |
542 | } | |
543 | ||
544 | /* We do not clear ssh1_host key and cookie. XXX - Okay Niels? */ | |
545 | } | |
546 | ||
547 | static void | |
548 | privsep_preauth_child(void) | |
549 | { | |
d03f4262 | 550 | u_int32_t rnd[256]; |
551 | gid_t gidset[1]; | |
510132b6 | 552 | struct passwd *pw; |
276b07a3 | 553 | int i; |
510132b6 | 554 | |
555 | /* Enable challenge-response authentication for privilege separation */ | |
556 | privsep_challenge_enable(); | |
557 | ||
558 | for (i = 0; i < 256; i++) | |
d03f4262 | 559 | rnd[i] = arc4random(); |
560 | RAND_seed(rnd, sizeof(rnd)); | |
510132b6 | 561 | |
562 | /* Demote the private keys to public keys. */ | |
563 | demote_sensitive_data(); | |
564 | ||
565 | if ((pw = getpwnam(SSH_PRIVSEP_USER)) == NULL) | |
566 | fatal("Privilege separation user %s does not exist", | |
567 | SSH_PRIVSEP_USER); | |
568 | memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); | |
569 | endpwent(); | |
570 | ||
d03f4262 | 571 | /* Change our root directory */ |
510132b6 | 572 | if (chroot(_PATH_PRIVSEP_CHROOT_DIR) == -1) |
573 | fatal("chroot(\"%s\"): %s", _PATH_PRIVSEP_CHROOT_DIR, | |
574 | strerror(errno)); | |
575 | if (chdir("/") == -1) | |
576 | fatal("chdir(\"/\"): %s", strerror(errno)); | |
577 | ||
578 | /* Drop our privileges */ | |
579 | debug3("privsep user:group %u:%u", (u_int)pw->pw_uid, | |
580 | (u_int)pw->pw_gid); | |
276b07a3 | 581 | #if 0 |
12a403af | 582 | /* XXX not ready, too heavy after chroot */ |
510132b6 | 583 | do_setusercontext(pw); |
276b07a3 | 584 | #else |
585 | gidset[0] = pw->pw_gid; | |
276b07a3 | 586 | if (setgroups(1, gidset) < 0) |
587 | fatal("setgroups: %.100s", strerror(errno)); | |
588 | permanently_set_uid(pw); | |
589 | #endif | |
510132b6 | 590 | } |
591 | ||
540d72c3 | 592 | static int |
593 | privsep_preauth(Authctxt *authctxt) | |
510132b6 | 594 | { |
510132b6 | 595 | int status; |
596 | pid_t pid; | |
597 | ||
598 | /* Set up unprivileged child process to deal with network data */ | |
599 | pmonitor = monitor_init(); | |
600 | /* Store a pointer to the kex for later rekeying */ | |
601 | pmonitor->m_pkex = &xxx_kex; | |
602 | ||
603 | pid = fork(); | |
604 | if (pid == -1) { | |
605 | fatal("fork of unprivileged child failed"); | |
606 | } else if (pid != 0) { | |
44a053a3 | 607 | debug2("Network child is on pid %ld", (long)pid); |
510132b6 | 608 | |
609 | close(pmonitor->m_recvfd); | |
540d72c3 | 610 | pmonitor->m_pid = pid; |
611 | monitor_child_preauth(authctxt, pmonitor); | |
510132b6 | 612 | close(pmonitor->m_sendfd); |
613 | ||
614 | /* Sync memory */ | |
615 | monitor_sync(pmonitor); | |
616 | ||
617 | /* Wait for the child's exit status */ | |
618 | while (waitpid(pid, &status, 0) < 0) | |
619 | if (errno != EINTR) | |
620 | break; | |
540d72c3 | 621 | return (1); |
510132b6 | 622 | } else { |
623 | /* child */ | |
624 | ||
625 | close(pmonitor->m_sendfd); | |
626 | ||
627 | /* Demote the child */ | |
628 | if (getuid() == 0 || geteuid() == 0) | |
629 | privsep_preauth_child(); | |
630 | setproctitle("%s", "[net]"); | |
631 | } | |
540d72c3 | 632 | return (0); |
510132b6 | 633 | } |
634 | ||
635 | static void | |
636 | privsep_postauth(Authctxt *authctxt) | |
637 | { | |
d03f4262 | 638 | #ifdef DISABLE_FD_PASSING |
276b07a3 | 639 | if (1) { |
640 | #else | |
510132b6 | 641 | if (authctxt->pw->pw_uid == 0 || options.use_login) { |
276b07a3 | 642 | #endif |
510132b6 | 643 | /* File descriptor passing is broken or root login */ |
644 | monitor_apply_keystate(pmonitor); | |
645 | use_privsep = 0; | |
646 | return; | |
647 | } | |
648 | ||
649 | /* Authentication complete */ | |
650 | alarm(0); | |
651 | if (startup_pipe != -1) { | |
652 | close(startup_pipe); | |
653 | startup_pipe = -1; | |
654 | } | |
655 | ||
656 | /* New socket pair */ | |
657 | monitor_reinit(pmonitor); | |
658 | ||
659 | pmonitor->m_pid = fork(); | |
660 | if (pmonitor->m_pid == -1) | |
661 | fatal("fork of unprivileged child failed"); | |
662 | else if (pmonitor->m_pid != 0) { | |
44a053a3 | 663 | debug2("User child is on pid %ld", (long)pmonitor->m_pid); |
510132b6 | 664 | close(pmonitor->m_recvfd); |
7e82606e | 665 | buffer_clear(&loginmsg); |
510132b6 | 666 | monitor_child_postauth(pmonitor); |
667 | ||
668 | /* NEVERREACHED */ | |
669 | exit(0); | |
670 | } | |
671 | ||
672 | close(pmonitor->m_sendfd); | |
673 | ||
674 | /* Demote the private keys to public keys. */ | |
675 | demote_sensitive_data(); | |
676 | ||
677 | /* Drop privileges */ | |
678 | do_setusercontext(authctxt->pw); | |
679 | ||
680 | /* It is safe now to apply the key state */ | |
681 | monitor_apply_keystate(pmonitor); | |
682 | } | |
683 | ||
3c0ef626 | 684 | static char * |
685 | list_hostkey_types(void) | |
686 | { | |
1e608e42 | 687 | Buffer b; |
540d72c3 | 688 | const char *p; |
689 | char *ret; | |
3c0ef626 | 690 | int i; |
1e608e42 | 691 | |
692 | buffer_init(&b); | |
693 | for (i = 0; i < options.num_host_key_files; i++) { | |
3c0ef626 | 694 | Key *key = sensitive_data.host_keys[i]; |
695 | if (key == NULL) | |
696 | continue; | |
1e608e42 | 697 | switch (key->type) { |
3c0ef626 | 698 | case KEY_RSA: |
699 | case KEY_DSA: | |
1e608e42 | 700 | if (buffer_len(&b) > 0) |
701 | buffer_append(&b, ",", 1); | |
702 | p = key_ssh_name(key); | |
703 | buffer_append(&b, p, strlen(p)); | |
3c0ef626 | 704 | break; |
705 | } | |
706 | } | |
1e608e42 | 707 | buffer_append(&b, "\0", 1); |
540d72c3 | 708 | ret = xstrdup(buffer_ptr(&b)); |
1e608e42 | 709 | buffer_free(&b); |
540d72c3 | 710 | debug("list_hostkey_types: %s", ret); |
711 | return ret; | |
3c0ef626 | 712 | } |
713 | ||
510132b6 | 714 | Key * |
3c0ef626 | 715 | get_hostkey_by_type(int type) |
716 | { | |
717 | int i; | |
276b07a3 | 718 | |
1e608e42 | 719 | for (i = 0; i < options.num_host_key_files; i++) { |
3c0ef626 | 720 | Key *key = sensitive_data.host_keys[i]; |
721 | if (key != NULL && key->type == type) | |
722 | return key; | |
723 | } | |
724 | return NULL; | |
725 | } | |
726 | ||
510132b6 | 727 | Key * |
728 | get_hostkey_by_index(int ind) | |
729 | { | |
730 | if (ind < 0 || ind >= options.num_host_key_files) | |
731 | return (NULL); | |
732 | return (sensitive_data.host_keys[ind]); | |
733 | } | |
734 | ||
735 | int | |
736 | get_hostkey_index(Key *key) | |
737 | { | |
738 | int i; | |
276b07a3 | 739 | |
510132b6 | 740 | for (i = 0; i < options.num_host_key_files; i++) { |
741 | if (key == sensitive_data.host_keys[i]) | |
742 | return (i); | |
743 | } | |
744 | return (-1); | |
745 | } | |
746 | ||
3c0ef626 | 747 | /* |
748 | * returns 1 if connection should be dropped, 0 otherwise. | |
749 | * dropping starts at connection #max_startups_begin with a probability | |
750 | * of (max_startups_rate/100). the probability increases linearly until | |
751 | * all connections are dropped for startups > max_startups | |
752 | */ | |
753 | static int | |
754 | drop_connection(int startups) | |
755 | { | |
dfddba3d | 756 | int p, r; |
3c0ef626 | 757 | |
758 | if (startups < options.max_startups_begin) | |
759 | return 0; | |
760 | if (startups >= options.max_startups) | |
761 | return 1; | |
762 | if (options.max_startups_rate == 100) | |
763 | return 1; | |
764 | ||
765 | p = 100 - options.max_startups_rate; | |
766 | p *= startups - options.max_startups_begin; | |
dfddba3d | 767 | p /= options.max_startups - options.max_startups_begin; |
3c0ef626 | 768 | p += options.max_startups_rate; |
dfddba3d | 769 | r = arc4random() % 100; |
3c0ef626 | 770 | |
dfddba3d | 771 | debug("drop_connection: p %d, r %d", p, r); |
3c0ef626 | 772 | return (r < p) ? 1 : 0; |
773 | } | |
774 | ||
1e608e42 | 775 | static void |
776 | usage(void) | |
777 | { | |
12a403af | 778 | fprintf(stderr, "%s, %s\n", |
dfddba3d | 779 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
12a403af | 780 | fprintf(stderr, |
781 | "usage: sshd [-46Ddeiqt] [-b bits] [-f config_file] [-g login_grace_time]\n" | |
782 | " [-h host_key_file] [-k key_gen_time] [-o option] [-p port] [-u len]\n" | |
783 | ); | |
1e608e42 | 784 | exit(1); |
785 | } | |
3c0ef626 | 786 | |
7e82606e | 787 | static void |
788 | send_rexec_state(int fd, Buffer *conf) | |
789 | { | |
790 | Buffer m; | |
791 | ||
792 | debug3("%s: entering fd = %d config len %d", __func__, fd, | |
793 | buffer_len(conf)); | |
794 | ||
795 | /* | |
796 | * Protocol from reexec master to child: | |
797 | * string configuration | |
798 | * u_int ephemeral_key_follows | |
799 | * bignum e (only if ephemeral_key_follows == 1) | |
800 | * bignum n " | |
801 | * bignum d " | |
802 | * bignum iqmp " | |
803 | * bignum p " | |
804 | * bignum q " | |
805 | */ | |
806 | buffer_init(&m); | |
807 | buffer_put_cstring(&m, buffer_ptr(conf)); | |
808 | ||
809 | if (sensitive_data.server_key != NULL && | |
810 | sensitive_data.server_key->type == KEY_RSA1) { | |
811 | buffer_put_int(&m, 1); | |
812 | buffer_put_bignum(&m, sensitive_data.server_key->rsa->e); | |
813 | buffer_put_bignum(&m, sensitive_data.server_key->rsa->n); | |
814 | buffer_put_bignum(&m, sensitive_data.server_key->rsa->d); | |
815 | buffer_put_bignum(&m, sensitive_data.server_key->rsa->iqmp); | |
816 | buffer_put_bignum(&m, sensitive_data.server_key->rsa->p); | |
817 | buffer_put_bignum(&m, sensitive_data.server_key->rsa->q); | |
818 | } else | |
819 | buffer_put_int(&m, 0); | |
820 | ||
821 | if (ssh_msg_send(fd, 0, &m) == -1) | |
822 | fatal("%s: ssh_msg_send failed", __func__); | |
823 | ||
824 | buffer_free(&m); | |
825 | ||
826 | debug3("%s: done", __func__); | |
827 | } | |
828 | ||
829 | static void | |
830 | recv_rexec_state(int fd, Buffer *conf) | |
831 | { | |
832 | Buffer m; | |
833 | char *cp; | |
834 | u_int len; | |
835 | ||
836 | debug3("%s: entering fd = %d", __func__, fd); | |
837 | ||
838 | buffer_init(&m); | |
839 | ||
840 | if (ssh_msg_recv(fd, &m) == -1) | |
841 | fatal("%s: ssh_msg_recv failed", __func__); | |
842 | if (buffer_get_char(&m) != 0) | |
843 | fatal("%s: rexec version mismatch", __func__); | |
844 | ||
845 | cp = buffer_get_string(&m, &len); | |
846 | if (conf != NULL) | |
847 | buffer_append(conf, cp, len + 1); | |
848 | xfree(cp); | |
849 | ||
850 | if (buffer_get_int(&m)) { | |
851 | if (sensitive_data.server_key != NULL) | |
852 | key_free(sensitive_data.server_key); | |
853 | sensitive_data.server_key = key_new_private(KEY_RSA1); | |
854 | buffer_get_bignum(&m, sensitive_data.server_key->rsa->e); | |
855 | buffer_get_bignum(&m, sensitive_data.server_key->rsa->n); | |
856 | buffer_get_bignum(&m, sensitive_data.server_key->rsa->d); | |
857 | buffer_get_bignum(&m, sensitive_data.server_key->rsa->iqmp); | |
858 | buffer_get_bignum(&m, sensitive_data.server_key->rsa->p); | |
859 | buffer_get_bignum(&m, sensitive_data.server_key->rsa->q); | |
860 | rsa_generate_additional_parameters( | |
861 | sensitive_data.server_key->rsa); | |
862 | } | |
863 | buffer_free(&m); | |
864 | ||
865 | debug3("%s: done", __func__); | |
866 | } | |
867 | ||
3c0ef626 | 868 | /* |
869 | * Main program for the daemon. | |
870 | */ | |
871 | int | |
872 | main(int ac, char **av) | |
873 | { | |
874 | extern char *optarg; | |
875 | extern int optind; | |
7e82606e | 876 | int opt, j, i, fdsetsz, on = 1; |
877 | int sock_in = -1, sock_out = -1, newsock = -1; | |
3c0ef626 | 878 | pid_t pid; |
879 | socklen_t fromlen; | |
880 | fd_set *fdset; | |
881 | struct sockaddr_storage from; | |
882 | const char *remote_ip; | |
883 | int remote_port; | |
884 | FILE *f; | |
3c0ef626 | 885 | struct addrinfo *ai; |
886 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
540d72c3 | 887 | char *line; |
3c0ef626 | 888 | int listen_sock, maxfd; |
dfddba3d | 889 | int startup_p[2] = { -1 , -1 }, config_s[2] = { -1 , -1 }; |
3c0ef626 | 890 | int startups = 0; |
891 | Key *key; | |
540d72c3 | 892 | Authctxt *authctxt; |
3c0ef626 | 893 | int ret, key_used = 0; |
7e82606e | 894 | Buffer cfg; |
3c0ef626 | 895 | |
510132b6 | 896 | #ifdef HAVE_SECUREWARE |
897 | (void)set_auth_parameters(ac, av); | |
898 | #endif | |
7cac2b65 | 899 | __progname = ssh_get_progname(av[0]); |
3c0ef626 | 900 | init_rng(); |
901 | ||
bfe49944 | 902 | /* Save argv. Duplicate so setproctitle emulation doesn't clobber it */ |
3c0ef626 | 903 | saved_argc = ac; |
7e82606e | 904 | rexec_argc = ac; |
7cac2b65 | 905 | saved_argv = xmalloc(sizeof(*saved_argv) * (ac + 1)); |
bfe49944 | 906 | for (i = 0; i < ac; i++) |
907 | saved_argv[i] = xstrdup(av[i]); | |
7cac2b65 | 908 | saved_argv[i] = NULL; |
bfe49944 | 909 | |
910 | #ifndef HAVE_SETPROCTITLE | |
911 | /* Prepare for later setproctitle emulation */ | |
912 | compat_init_setproctitle(ac, av); | |
7cac2b65 | 913 | av = saved_argv; |
bfe49944 | 914 | #endif |
3c0ef626 | 915 | |
12a403af | 916 | if (geteuid() == 0 && setgroups(0, NULL) == -1) |
917 | debug("setgroups(): %.200s", strerror(errno)); | |
918 | ||
3c0ef626 | 919 | /* Initialize configuration options to their default values. */ |
920 | initialize_server_options(&options); | |
921 | ||
922 | /* Parse command-line arguments. */ | |
7e82606e | 923 | while ((opt = getopt(ac, av, "f:p:b:k:h:g:u:o:dDeiqrtQR46")) != -1) { |
3c0ef626 | 924 | switch (opt) { |
925 | case '4': | |
dfddba3d | 926 | options.address_family = AF_INET; |
3c0ef626 | 927 | break; |
928 | case '6': | |
dfddba3d | 929 | options.address_family = AF_INET6; |
3c0ef626 | 930 | break; |
931 | case 'f': | |
932 | config_file_name = optarg; | |
933 | break; | |
934 | case 'd': | |
7cac2b65 | 935 | if (debug_flag == 0) { |
3c0ef626 | 936 | debug_flag = 1; |
937 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
7cac2b65 | 938 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) |
3c0ef626 | 939 | options.log_level++; |
3c0ef626 | 940 | break; |
941 | case 'D': | |
942 | no_daemon_flag = 1; | |
943 | break; | |
944 | case 'e': | |
945 | log_stderr = 1; | |
946 | break; | |
947 | case 'i': | |
948 | inetd_flag = 1; | |
949 | break; | |
7e82606e | 950 | case 'r': |
951 | rexec_flag = 0; | |
952 | break; | |
953 | case 'R': | |
954 | rexeced_flag = 1; | |
955 | inetd_flag = 1; | |
956 | break; | |
3c0ef626 | 957 | case 'Q': |
958 | /* ignored */ | |
959 | break; | |
960 | case 'q': | |
961 | options.log_level = SYSLOG_LEVEL_QUIET; | |
962 | break; | |
963 | case 'b': | |
964 | options.server_key_bits = atoi(optarg); | |
965 | break; | |
966 | case 'p': | |
967 | options.ports_from_cmdline = 1; | |
968 | if (options.num_ports >= MAX_PORTS) { | |
969 | fprintf(stderr, "too many ports.\n"); | |
970 | exit(1); | |
971 | } | |
972 | options.ports[options.num_ports++] = a2port(optarg); | |
973 | if (options.ports[options.num_ports-1] == 0) { | |
974 | fprintf(stderr, "Bad port number.\n"); | |
975 | exit(1); | |
976 | } | |
977 | break; | |
978 | case 'g': | |
979 | if ((options.login_grace_time = convtime(optarg)) == -1) { | |
980 | fprintf(stderr, "Invalid login grace time.\n"); | |
981 | exit(1); | |
982 | } | |
983 | break; | |
984 | case 'k': | |
985 | if ((options.key_regeneration_time = convtime(optarg)) == -1) { | |
986 | fprintf(stderr, "Invalid key regeneration interval.\n"); | |
987 | exit(1); | |
988 | } | |
989 | break; | |
990 | case 'h': | |
991 | if (options.num_host_key_files >= MAX_HOSTKEYS) { | |
992 | fprintf(stderr, "too many host keys.\n"); | |
993 | exit(1); | |
994 | } | |
995 | options.host_key_files[options.num_host_key_files++] = optarg; | |
996 | break; | |
3c0ef626 | 997 | case 't': |
998 | test_flag = 1; | |
999 | break; | |
1000 | case 'u': | |
1001 | utmp_len = atoi(optarg); | |
d03f4262 | 1002 | if (utmp_len > MAXHOSTNAMELEN) { |
1003 | fprintf(stderr, "Invalid utmp length.\n"); | |
1004 | exit(1); | |
1005 | } | |
3c0ef626 | 1006 | break; |
1e608e42 | 1007 | case 'o': |
540d72c3 | 1008 | line = xstrdup(optarg); |
1009 | if (process_server_config_line(&options, line, | |
1e608e42 | 1010 | "command-line", 0) != 0) |
1011 | exit(1); | |
540d72c3 | 1012 | xfree(line); |
1e608e42 | 1013 | break; |
3c0ef626 | 1014 | case '?': |
1015 | default: | |
1e608e42 | 1016 | usage(); |
1017 | break; | |
3c0ef626 | 1018 | } |
1019 | } | |
7e82606e | 1020 | if (rexeced_flag || inetd_flag) |
1021 | rexec_flag = 0; | |
1022 | if (rexec_flag && (av[0] == NULL || *av[0] != '/')) | |
1023 | fatal("sshd re-exec requires execution with an absolute path"); | |
1024 | if (rexeced_flag) | |
1025 | closefrom(REEXEC_MIN_FREE_FD); | |
1026 | else | |
1027 | closefrom(REEXEC_DEVCRYPTO_RESERVED_FD); | |
1028 | ||
3c0ef626 | 1029 | SSLeay_add_all_algorithms(); |
3c0ef626 | 1030 | |
1031 | /* | |
1032 | * Force logging to stderr until we have loaded the private host | |
1033 | * key (unless started from inetd) | |
1034 | */ | |
1035 | log_init(__progname, | |
1e608e42 | 1036 | options.log_level == SYSLOG_LEVEL_NOT_SET ? |
1037 | SYSLOG_LEVEL_INFO : options.log_level, | |
1038 | options.log_facility == SYSLOG_FACILITY_NOT_SET ? | |
1039 | SYSLOG_FACILITY_AUTH : options.log_facility, | |
bfe49944 | 1040 | log_stderr || !inetd_flag); |
3c0ef626 | 1041 | |
12a403af | 1042 | /* |
1043 | * Unset KRB5CCNAME, otherwise the user's session may inherit it from | |
1044 | * root's environment | |
1045 | */ | |
dfddba3d | 1046 | if (getenv("KRB5CCNAME") != NULL) |
1047 | unsetenv("KRB5CCNAME"); | |
1048 | ||
d03f4262 | 1049 | #ifdef _UNICOS |
7e82606e | 1050 | /* Cray can define user privs drop all privs now! |
3c0ef626 | 1051 | * Not needed on PRIV_SU systems! |
1052 | */ | |
1053 | drop_cray_privs(); | |
1054 | #endif | |
1055 | ||
1056 | seed_rng(); | |
1057 | ||
7e82606e | 1058 | sensitive_data.server_key = NULL; |
1059 | sensitive_data.ssh1_host_key = NULL; | |
1060 | sensitive_data.have_ssh1_key = 0; | |
1061 | sensitive_data.have_ssh2_key = 0; | |
1062 | ||
1063 | /* Fetch our configuration */ | |
1064 | buffer_init(&cfg); | |
1065 | if (rexeced_flag) | |
1066 | recv_rexec_state(REEXEC_CONFIG_PASS_FD, &cfg); | |
1067 | else | |
1068 | load_server_config(config_file_name, &cfg); | |
1069 | ||
1070 | parse_server_config(&options, | |
1071 | rexeced_flag ? "rexec" : config_file_name, &cfg); | |
1072 | ||
1073 | if (!rexec_flag) | |
1074 | buffer_free(&cfg); | |
3c0ef626 | 1075 | |
1076 | /* Fill in default values for those options not explicitly set. */ | |
1077 | fill_default_server_options(&options); | |
1078 | ||
dfddba3d | 1079 | /* set default channel AF */ |
1080 | channel_set_af(options.address_family); | |
1081 | ||
3c0ef626 | 1082 | /* Check that there are no remaining arguments. */ |
1083 | if (optind < ac) { | |
1084 | fprintf(stderr, "Extra argument %s.\n", av[optind]); | |
1085 | exit(1); | |
1086 | } | |
1087 | ||
dfddba3d | 1088 | debug("sshd version %.100s", SSH_RELEASE); |
3c0ef626 | 1089 | |
1090 | /* load private host keys */ | |
d03f4262 | 1091 | sensitive_data.host_keys = xmalloc(options.num_host_key_files * |
1092 | sizeof(Key *)); | |
1e608e42 | 1093 | for (i = 0; i < options.num_host_key_files; i++) |
3c0ef626 | 1094 | sensitive_data.host_keys[i] = NULL; |
3c0ef626 | 1095 | |
1e608e42 | 1096 | for (i = 0; i < options.num_host_key_files; i++) { |
3c0ef626 | 1097 | key = key_load_private(options.host_key_files[i], "", NULL); |
1098 | sensitive_data.host_keys[i] = key; | |
1099 | if (key == NULL) { | |
1100 | error("Could not load host key: %s", | |
1101 | options.host_key_files[i]); | |
1102 | sensitive_data.host_keys[i] = NULL; | |
1103 | continue; | |
1104 | } | |
1e608e42 | 1105 | switch (key->type) { |
3c0ef626 | 1106 | case KEY_RSA1: |
1107 | sensitive_data.ssh1_host_key = key; | |
1108 | sensitive_data.have_ssh1_key = 1; | |
1109 | break; | |
1110 | case KEY_RSA: | |
1111 | case KEY_DSA: | |
1112 | sensitive_data.have_ssh2_key = 1; | |
1113 | break; | |
1114 | } | |
1115 | debug("private host key: #%d type %d %s", i, key->type, | |
1116 | key_type(key)); | |
1117 | } | |
1118 | if ((options.protocol & SSH_PROTO_1) && !sensitive_data.have_ssh1_key) { | |
7cac2b65 | 1119 | logit("Disabling protocol version 1. Could not load host key"); |
3c0ef626 | 1120 | options.protocol &= ~SSH_PROTO_1; |
1121 | } | |
5598e598 | 1122 | #ifndef GSSAPI |
1123 | /* The GSSAPI key exchange can run without a host key */ | |
3c0ef626 | 1124 | if ((options.protocol & SSH_PROTO_2) && !sensitive_data.have_ssh2_key) { |
7cac2b65 | 1125 | logit("Disabling protocol version 2. Could not load host key"); |
3c0ef626 | 1126 | options.protocol &= ~SSH_PROTO_2; |
1127 | } | |
5598e598 | 1128 | #endif |
3c0ef626 | 1129 | if (!(options.protocol & (SSH_PROTO_1|SSH_PROTO_2))) { |
7cac2b65 | 1130 | logit("sshd: no hostkeys available -- exiting."); |
3c0ef626 | 1131 | exit(1); |
1132 | } | |
1133 | ||
1134 | /* Check certain values for sanity. */ | |
1135 | if (options.protocol & SSH_PROTO_1) { | |
1136 | if (options.server_key_bits < 512 || | |
1137 | options.server_key_bits > 32768) { | |
1138 | fprintf(stderr, "Bad server key size.\n"); | |
1139 | exit(1); | |
1140 | } | |
1141 | /* | |
1142 | * Check that server and host key lengths differ sufficiently. This | |
1143 | * is necessary to make double encryption work with rsaref. Oh, I | |
1144 | * hate software patents. I dont know if this can go? Niels | |
1145 | */ | |
1146 | if (options.server_key_bits > | |
276b07a3 | 1147 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) - |
1148 | SSH_KEY_BITS_RESERVED && options.server_key_bits < | |
1149 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + | |
1150 | SSH_KEY_BITS_RESERVED) { | |
3c0ef626 | 1151 | options.server_key_bits = |
276b07a3 | 1152 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + |
1153 | SSH_KEY_BITS_RESERVED; | |
3c0ef626 | 1154 | debug("Forcing server key to %d bits to make it differ from host key.", |
1155 | options.server_key_bits); | |
1156 | } | |
1157 | } | |
1158 | ||
44a053a3 | 1159 | if (use_privsep) { |
1160 | struct passwd *pw; | |
1161 | struct stat st; | |
1162 | ||
1163 | if ((pw = getpwnam(SSH_PRIVSEP_USER)) == NULL) | |
1164 | fatal("Privilege separation user %s does not exist", | |
1165 | SSH_PRIVSEP_USER); | |
1166 | if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) || | |
1167 | (S_ISDIR(st.st_mode) == 0)) | |
1168 | fatal("Missing privilege separation directory: %s", | |
1169 | _PATH_PRIVSEP_CHROOT_DIR); | |
d03f4262 | 1170 | |
1171 | #ifdef HAVE_CYGWIN | |
1172 | if (check_ntsec(_PATH_PRIVSEP_CHROOT_DIR) && | |
1173 | (st.st_uid != getuid () || | |
1174 | (st.st_mode & (S_IWGRP|S_IWOTH)) != 0)) | |
1175 | #else | |
276b07a3 | 1176 | if (st.st_uid != 0 || (st.st_mode & (S_IWGRP|S_IWOTH)) != 0) |
d03f4262 | 1177 | #endif |
bfe49944 | 1178 | fatal("%s must be owned by root and not group or " |
1179 | "world-writable.", _PATH_PRIVSEP_CHROOT_DIR); | |
44a053a3 | 1180 | } |
1181 | ||
3c0ef626 | 1182 | /* Configuration looks good, so exit if in test mode. */ |
1183 | if (test_flag) | |
1184 | exit(0); | |
1185 | ||
510132b6 | 1186 | /* |
1187 | * Clear out any supplemental groups we may have inherited. This | |
1188 | * prevents inadvertent creation of files with bad modes (in the | |
540d72c3 | 1189 | * portable version at least, it's certainly possible for PAM |
1190 | * to create a file, and we can't control the code in every | |
510132b6 | 1191 | * module which might be used). |
1192 | */ | |
1193 | if (setgroups(0, NULL) < 0) | |
1194 | debug("setgroups() failed: %.200s", strerror(errno)); | |
3c0ef626 | 1195 | |
7e82606e | 1196 | if (rexec_flag) { |
1197 | rexec_argv = xmalloc(sizeof(char *) * (rexec_argc + 2)); | |
1198 | for (i = 0; i < rexec_argc; i++) { | |
1199 | debug("rexec_argv[%d]='%s'", i, saved_argv[i]); | |
1200 | rexec_argv[i] = saved_argv[i]; | |
1201 | } | |
1202 | rexec_argv[rexec_argc] = "-R"; | |
1203 | rexec_argv[rexec_argc + 1] = NULL; | |
1204 | } | |
1205 | ||
3c0ef626 | 1206 | /* Initialize the log (it is reinitialized below in case we forked). */ |
dfddba3d | 1207 | if (debug_flag && (!inetd_flag || rexeced_flag)) |
3c0ef626 | 1208 | log_stderr = 1; |
1209 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
1210 | ||
1211 | /* | |
1212 | * If not in debugging mode, and not started from inetd, disconnect | |
1213 | * from the controlling terminal, and fork. The original process | |
1214 | * exits. | |
1215 | */ | |
1216 | if (!(debug_flag || inetd_flag || no_daemon_flag)) { | |
1217 | #ifdef TIOCNOTTY | |
1218 | int fd; | |
1219 | #endif /* TIOCNOTTY */ | |
1220 | if (daemon(0, 0) < 0) | |
1221 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1222 | ||
1223 | /* Disconnect from the controlling tty. */ | |
1224 | #ifdef TIOCNOTTY | |
1225 | fd = open(_PATH_TTY, O_RDWR | O_NOCTTY); | |
1226 | if (fd >= 0) { | |
1227 | (void) ioctl(fd, TIOCNOTTY, NULL); | |
1228 | close(fd); | |
1229 | } | |
1230 | #endif /* TIOCNOTTY */ | |
1231 | } | |
1232 | /* Reinitialize the log (because of the fork above). */ | |
1233 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
1234 | ||
1235 | /* Initialize the random number generator. */ | |
1236 | arc4random_stir(); | |
1237 | ||
1238 | /* Chdir to the root directory so that the current disk can be | |
1239 | unmounted if desired. */ | |
1240 | chdir("/"); | |
1e608e42 | 1241 | |
3c0ef626 | 1242 | /* ignore SIGPIPE */ |
1243 | signal(SIGPIPE, SIG_IGN); | |
1244 | ||
1245 | /* Start listening for a socket, unless started from inetd. */ | |
1246 | if (inetd_flag) { | |
7e82606e | 1247 | int fd; |
1248 | ||
3c0ef626 | 1249 | startup_pipe = -1; |
7e82606e | 1250 | if (rexeced_flag) { |
1251 | close(REEXEC_CONFIG_PASS_FD); | |
1252 | sock_in = sock_out = dup(STDIN_FILENO); | |
1253 | if (!debug_flag) { | |
1254 | startup_pipe = dup(REEXEC_STARTUP_PIPE_FD); | |
1255 | close(REEXEC_STARTUP_PIPE_FD); | |
1256 | } | |
1257 | } else { | |
1258 | sock_in = dup(STDIN_FILENO); | |
1259 | sock_out = dup(STDOUT_FILENO); | |
1260 | } | |
3c0ef626 | 1261 | /* |
1262 | * We intentionally do not close the descriptors 0, 1, and 2 | |
7e82606e | 1263 | * as our code for setting the descriptors won't work if |
3c0ef626 | 1264 | * ttyfd happens to be one of those. |
1265 | */ | |
7e82606e | 1266 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
1267 | dup2(fd, STDIN_FILENO); | |
1268 | dup2(fd, STDOUT_FILENO); | |
1269 | if (fd > STDOUT_FILENO) | |
1270 | close(fd); | |
1271 | } | |
3c0ef626 | 1272 | debug("inetd sockets after dupping: %d, %d", sock_in, sock_out); |
7e82606e | 1273 | if ((options.protocol & SSH_PROTO_1) && |
1274 | sensitive_data.server_key == NULL) | |
3c0ef626 | 1275 | generate_ephemeral_server_key(); |
1276 | } else { | |
1277 | for (ai = options.listen_addrs; ai; ai = ai->ai_next) { | |
1278 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
1279 | continue; | |
1280 | if (num_listen_socks >= MAX_LISTEN_SOCKS) | |
1281 | fatal("Too many listen sockets. " | |
1282 | "Enlarge MAX_LISTEN_SOCKS"); | |
dfddba3d | 1283 | if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, |
3c0ef626 | 1284 | ntop, sizeof(ntop), strport, sizeof(strport), |
dfddba3d | 1285 | NI_NUMERICHOST|NI_NUMERICSERV)) != 0) { |
1286 | error("getnameinfo failed: %.100s", | |
1287 | (ret != EAI_SYSTEM) ? gai_strerror(ret) : | |
1288 | strerror(errno)); | |
3c0ef626 | 1289 | continue; |
1290 | } | |
1291 | /* Create socket for listening. */ | |
7cac2b65 | 1292 | listen_sock = socket(ai->ai_family, ai->ai_socktype, |
1293 | ai->ai_protocol); | |
3c0ef626 | 1294 | if (listen_sock < 0) { |
1295 | /* kernel may not support ipv6 */ | |
1296 | verbose("socket: %.100s", strerror(errno)); | |
1297 | continue; | |
1298 | } | |
7e82606e | 1299 | if (set_nonblock(listen_sock) == -1) { |
3c0ef626 | 1300 | close(listen_sock); |
1301 | continue; | |
1302 | } | |
1303 | /* | |
d03f4262 | 1304 | * Set socket options. |
1305 | * Allow local port reuse in TIME_WAIT. | |
3c0ef626 | 1306 | */ |
d03f4262 | 1307 | if (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, |
1308 | &on, sizeof(on)) == -1) | |
1309 | error("setsockopt SO_REUSEADDR: %s", strerror(errno)); | |
3c0ef626 | 1310 | |
1311 | debug("Bind to port %s on %s.", strport, ntop); | |
1312 | ||
1313 | /* Bind the socket to the desired port. */ | |
1314 | if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
1315 | if (!ai->ai_next) | |
1316 | error("Bind to port %s on %s failed: %.200s.", | |
1317 | strport, ntop, strerror(errno)); | |
1318 | close(listen_sock); | |
1319 | continue; | |
1320 | } | |
1321 | listen_socks[num_listen_socks] = listen_sock; | |
1322 | num_listen_socks++; | |
1323 | ||
1324 | /* Start listening on the port. */ | |
7cac2b65 | 1325 | logit("Server listening on %s port %s.", ntop, strport); |
540d72c3 | 1326 | if (listen(listen_sock, SSH_LISTEN_BACKLOG) < 0) |
3c0ef626 | 1327 | fatal("listen: %.100s", strerror(errno)); |
1328 | ||
1329 | } | |
1330 | freeaddrinfo(options.listen_addrs); | |
1331 | ||
1332 | if (!num_listen_socks) | |
1333 | fatal("Cannot bind any address."); | |
1334 | ||
1335 | if (options.protocol & SSH_PROTO_1) | |
1336 | generate_ephemeral_server_key(); | |
1337 | ||
1338 | /* | |
1339 | * Arrange to restart on SIGHUP. The handler needs | |
1340 | * listen_sock. | |
1341 | */ | |
1342 | signal(SIGHUP, sighup_handler); | |
1343 | ||
1344 | signal(SIGTERM, sigterm_handler); | |
1345 | signal(SIGQUIT, sigterm_handler); | |
1346 | ||
1347 | /* Arrange SIGCHLD to be caught. */ | |
1348 | signal(SIGCHLD, main_sigchld_handler); | |
1349 | ||
1350 | /* Write out the pid file after the sigterm handler is setup */ | |
1351 | if (!debug_flag) { | |
1352 | /* | |
1353 | * Record our pid in /var/run/sshd.pid to make it | |
1354 | * easier to kill the correct sshd. We don't want to | |
1355 | * do this before the bind above because the bind will | |
1356 | * fail if there already is a daemon, and this will | |
1357 | * overwrite any old pid in the file. | |
1358 | */ | |
1359 | f = fopen(options.pid_file, "wb"); | |
7cac2b65 | 1360 | if (f == NULL) { |
1361 | error("Couldn't create pid file \"%s\": %s", | |
1362 | options.pid_file, strerror(errno)); | |
1363 | } else { | |
44a053a3 | 1364 | fprintf(f, "%ld\n", (long) getpid()); |
3c0ef626 | 1365 | fclose(f); |
1366 | } | |
1367 | } | |
1368 | ||
1369 | /* setup fd set for listen */ | |
1370 | fdset = NULL; | |
1371 | maxfd = 0; | |
1372 | for (i = 0; i < num_listen_socks; i++) | |
1373 | if (listen_socks[i] > maxfd) | |
1374 | maxfd = listen_socks[i]; | |
1375 | /* pipes connected to unauthenticated childs */ | |
1376 | startup_pipes = xmalloc(options.max_startups * sizeof(int)); | |
1377 | for (i = 0; i < options.max_startups; i++) | |
1378 | startup_pipes[i] = -1; | |
1379 | ||
1380 | /* | |
1381 | * Stay listening for connections until the system crashes or | |
1382 | * the daemon is killed with a signal. | |
1383 | */ | |
1384 | for (;;) { | |
1385 | if (received_sighup) | |
1386 | sighup_restart(); | |
1387 | if (fdset != NULL) | |
1388 | xfree(fdset); | |
1389 | fdsetsz = howmany(maxfd+1, NFDBITS) * sizeof(fd_mask); | |
1390 | fdset = (fd_set *)xmalloc(fdsetsz); | |
1391 | memset(fdset, 0, fdsetsz); | |
1392 | ||
1393 | for (i = 0; i < num_listen_socks; i++) | |
1394 | FD_SET(listen_socks[i], fdset); | |
1395 | for (i = 0; i < options.max_startups; i++) | |
1396 | if (startup_pipes[i] != -1) | |
1397 | FD_SET(startup_pipes[i], fdset); | |
1398 | ||
1399 | /* Wait in select until there is a connection. */ | |
1400 | ret = select(maxfd+1, fdset, NULL, NULL, NULL); | |
1401 | if (ret < 0 && errno != EINTR) | |
1402 | error("select: %.100s", strerror(errno)); | |
1403 | if (received_sigterm) { | |
7cac2b65 | 1404 | logit("Received signal %d; terminating.", |
1e608e42 | 1405 | (int) received_sigterm); |
3c0ef626 | 1406 | close_listen_socks(); |
1407 | unlink(options.pid_file); | |
1408 | exit(255); | |
1409 | } | |
1410 | if (key_used && key_do_regen) { | |
1411 | generate_ephemeral_server_key(); | |
1412 | key_used = 0; | |
1413 | key_do_regen = 0; | |
1414 | } | |
1415 | if (ret < 0) | |
1416 | continue; | |
1417 | ||
1418 | for (i = 0; i < options.max_startups; i++) | |
1419 | if (startup_pipes[i] != -1 && | |
1420 | FD_ISSET(startup_pipes[i], fdset)) { | |
1421 | /* | |
1422 | * the read end of the pipe is ready | |
1423 | * if the child has closed the pipe | |
1424 | * after successful authentication | |
1425 | * or if the child has died | |
1426 | */ | |
1427 | close(startup_pipes[i]); | |
1428 | startup_pipes[i] = -1; | |
1429 | startups--; | |
1430 | } | |
1431 | for (i = 0; i < num_listen_socks; i++) { | |
1432 | if (!FD_ISSET(listen_socks[i], fdset)) | |
1433 | continue; | |
1434 | fromlen = sizeof(from); | |
1435 | newsock = accept(listen_socks[i], (struct sockaddr *)&from, | |
1436 | &fromlen); | |
1437 | if (newsock < 0) { | |
1438 | if (errno != EINTR && errno != EWOULDBLOCK) | |
1439 | error("accept: %.100s", strerror(errno)); | |
1440 | continue; | |
1441 | } | |
7e82606e | 1442 | if (unset_nonblock(newsock) == -1) { |
1e608e42 | 1443 | close(newsock); |
3c0ef626 | 1444 | continue; |
1445 | } | |
1446 | if (drop_connection(startups) == 1) { | |
1447 | debug("drop connection #%d", startups); | |
1448 | close(newsock); | |
1449 | continue; | |
1450 | } | |
1451 | if (pipe(startup_p) == -1) { | |
1452 | close(newsock); | |
1453 | continue; | |
1454 | } | |
1455 | ||
7e82606e | 1456 | if (rexec_flag && socketpair(AF_UNIX, |
1457 | SOCK_STREAM, 0, config_s) == -1) { | |
1458 | error("reexec socketpair: %s", | |
1459 | strerror(errno)); | |
1460 | close(newsock); | |
1461 | close(startup_p[0]); | |
1462 | close(startup_p[1]); | |
1463 | continue; | |
1464 | } | |
1465 | ||
3c0ef626 | 1466 | for (j = 0; j < options.max_startups; j++) |
1467 | if (startup_pipes[j] == -1) { | |
1468 | startup_pipes[j] = startup_p[0]; | |
1469 | if (maxfd < startup_p[0]) | |
1470 | maxfd = startup_p[0]; | |
1471 | startups++; | |
1472 | break; | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * Got connection. Fork a child to handle it, unless | |
1477 | * we are in debugging mode. | |
1478 | */ | |
1479 | if (debug_flag) { | |
1480 | /* | |
1481 | * In debugging mode. Close the listening | |
1482 | * socket, and start processing the | |
1483 | * connection without forking. | |
1484 | */ | |
1485 | debug("Server will not fork when running in debugging mode."); | |
1486 | close_listen_socks(); | |
1487 | sock_in = newsock; | |
1488 | sock_out = newsock; | |
7e82606e | 1489 | close(startup_p[0]); |
1490 | close(startup_p[1]); | |
3c0ef626 | 1491 | startup_pipe = -1; |
1492 | pid = getpid(); | |
7e82606e | 1493 | if (rexec_flag) { |
1494 | send_rexec_state(config_s[0], | |
1495 | &cfg); | |
1496 | close(config_s[0]); | |
1497 | } | |
3c0ef626 | 1498 | break; |
1499 | } else { | |
1500 | /* | |
1501 | * Normal production daemon. Fork, and have | |
1502 | * the child process the connection. The | |
1503 | * parent continues listening. | |
1504 | */ | |
1505 | if ((pid = fork()) == 0) { | |
1506 | /* | |
1507 | * Child. Close the listening and max_startup | |
1508 | * sockets. Start using the accepted socket. | |
1509 | * Reinitialize logging (since our pid has | |
1510 | * changed). We break out of the loop to handle | |
1511 | * the connection. | |
1512 | */ | |
1513 | startup_pipe = startup_p[1]; | |
1e608e42 | 1514 | close_startup_pipes(); |
3c0ef626 | 1515 | close_listen_socks(); |
1516 | sock_in = newsock; | |
1517 | sock_out = newsock; | |
1518 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
dfddba3d | 1519 | if (rexec_flag) |
1520 | close(config_s[0]); | |
3c0ef626 | 1521 | break; |
1522 | } | |
1523 | } | |
1524 | ||
1525 | /* Parent. Stay in the loop. */ | |
1526 | if (pid < 0) | |
1527 | error("fork: %.100s", strerror(errno)); | |
1528 | else | |
44a053a3 | 1529 | debug("Forked child %ld.", (long)pid); |
3c0ef626 | 1530 | |
1531 | close(startup_p[1]); | |
1532 | ||
7e82606e | 1533 | if (rexec_flag) { |
1534 | send_rexec_state(config_s[0], &cfg); | |
1535 | close(config_s[0]); | |
1536 | close(config_s[1]); | |
1537 | } | |
1538 | ||
3c0ef626 | 1539 | /* Mark that the key has been used (it was "given" to the child). */ |
1540 | if ((options.protocol & SSH_PROTO_1) && | |
1541 | key_used == 0) { | |
1542 | /* Schedule server key regeneration alarm. */ | |
1543 | signal(SIGALRM, key_regeneration_alarm); | |
1544 | alarm(options.key_regeneration_time); | |
1545 | key_used = 1; | |
1546 | } | |
1547 | ||
1548 | arc4random_stir(); | |
1549 | ||
1550 | /* Close the new socket (the child is now taking care of it). */ | |
1551 | close(newsock); | |
1552 | } | |
1553 | /* child process check (or debug mode) */ | |
1554 | if (num_listen_socks < 0) | |
1555 | break; | |
1556 | } | |
1557 | } | |
1558 | ||
1559 | /* This is the child processing a new connection. */ | |
12a403af | 1560 | setproctitle("%s", "[accepted]"); |
3c0ef626 | 1561 | |
510132b6 | 1562 | /* |
1563 | * Create a new session and process group since the 4.4BSD | |
1564 | * setlogin() affects the entire process group. We don't | |
1565 | * want the child to be able to affect the parent. | |
1566 | */ | |
7cac2b65 | 1567 | #if !defined(SSHD_ACQUIRES_CTTY) |
bfe49944 | 1568 | /* |
7cac2b65 | 1569 | * If setsid is called, on some platforms sshd will later acquire a |
1570 | * controlling terminal which will result in "could not set | |
1571 | * controlling tty" errors. | |
bfe49944 | 1572 | */ |
276b07a3 | 1573 | if (!debug_flag && !inetd_flag && setsid() < 0) |
510132b6 | 1574 | error("setsid: %.100s", strerror(errno)); |
1575 | #endif | |
1576 | ||
7e82606e | 1577 | if (rexec_flag) { |
1578 | int fd; | |
1579 | ||
1580 | debug("rexec start in %d out %d newsock %d pipe %d sock %d", | |
1581 | sock_in, sock_out, newsock, startup_pipe, config_s[0]); | |
1582 | dup2(newsock, STDIN_FILENO); | |
1583 | dup2(STDIN_FILENO, STDOUT_FILENO); | |
1584 | if (startup_pipe == -1) | |
1585 | close(REEXEC_STARTUP_PIPE_FD); | |
1586 | else | |
1587 | dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD); | |
1588 | ||
1589 | dup2(config_s[1], REEXEC_CONFIG_PASS_FD); | |
1590 | close(config_s[1]); | |
1591 | if (startup_pipe != -1) | |
1592 | close(startup_pipe); | |
1593 | ||
1594 | execv(rexec_argv[0], rexec_argv); | |
1595 | ||
1596 | /* Reexec has failed, fall back and continue */ | |
1597 | error("rexec of %s failed: %s", rexec_argv[0], strerror(errno)); | |
1598 | recv_rexec_state(REEXEC_CONFIG_PASS_FD, NULL); | |
1599 | log_init(__progname, options.log_level, | |
1600 | options.log_facility, log_stderr); | |
1601 | ||
1602 | /* Clean up fds */ | |
1603 | startup_pipe = REEXEC_STARTUP_PIPE_FD; | |
1604 | close(config_s[1]); | |
1605 | close(REEXEC_CONFIG_PASS_FD); | |
1606 | newsock = sock_out = sock_in = dup(STDIN_FILENO); | |
1607 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { | |
1608 | dup2(fd, STDIN_FILENO); | |
1609 | dup2(fd, STDOUT_FILENO); | |
1610 | if (fd > STDERR_FILENO) | |
1611 | close(fd); | |
1612 | } | |
1613 | debug("rexec cleanup in %d out %d newsock %d pipe %d sock %d", | |
1614 | sock_in, sock_out, newsock, startup_pipe, config_s[0]); | |
1615 | } | |
1616 | ||
3c0ef626 | 1617 | /* |
1618 | * Disable the key regeneration alarm. We will not regenerate the | |
1619 | * key since we are no longer in a position to give it to anyone. We | |
1620 | * will not restart on SIGHUP since it no longer makes sense. | |
1621 | */ | |
1622 | alarm(0); | |
1623 | signal(SIGALRM, SIG_DFL); | |
1624 | signal(SIGHUP, SIG_DFL); | |
1625 | signal(SIGTERM, SIG_DFL); | |
1626 | signal(SIGQUIT, SIG_DFL); | |
1627 | signal(SIGCHLD, SIG_DFL); | |
1628 | signal(SIGINT, SIG_DFL); | |
1629 | ||
540d72c3 | 1630 | /* Set SO_KEEPALIVE if requested. */ |
1631 | if (options.tcp_keep_alive && | |
1e608e42 | 1632 | setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on, |
3c0ef626 | 1633 | sizeof(on)) < 0) |
1634 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); | |
1635 | ||
1636 | /* | |
1637 | * Register our connection. This turns encryption off because we do | |
1638 | * not have a key. | |
1639 | */ | |
1640 | packet_set_connection(sock_in, sock_out); | |
1641 | ||
1642 | remote_port = get_remote_port(); | |
1643 | remote_ip = get_remote_ipaddr(); | |
1644 | ||
dfddba3d | 1645 | #ifdef SSH_AUDIT_EVENTS |
1646 | audit_connection_from(remote_ip, remote_port); | |
1647 | #endif | |
3c0ef626 | 1648 | #ifdef LIBWRAP |
1649 | /* Check whether logins are denied from this host. */ | |
7e82606e | 1650 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 1651 | struct request_info req; |
1652 | ||
1653 | request_init(&req, RQ_DAEMON, __progname, RQ_FILE, sock_in, 0); | |
1654 | fromhost(&req); | |
1655 | ||
1656 | if (!hosts_access(&req)) { | |
1657 | debug("Connection refused by tcp wrapper"); | |
1658 | refuse(&req); | |
1659 | /* NOTREACHED */ | |
1660 | fatal("libwrap refuse returns"); | |
1661 | } | |
1662 | } | |
1663 | #endif /* LIBWRAP */ | |
1664 | ||
1665 | /* Log the connection. */ | |
1666 | verbose("Connection from %.500s port %d", remote_ip, remote_port); | |
1667 | ||
1668 | /* | |
1669 | * We don\'t want to listen forever unless the other side | |
1670 | * successfully authenticates itself. So we set up an alarm which is | |
1671 | * cleared after successful authentication. A limit of zero | |
1672 | * indicates no limit. Note that we don\'t set the alarm in debugging | |
1673 | * mode; it is just annoying to have the server exit just when you | |
1674 | * are about to discover the bug. | |
1675 | */ | |
1676 | signal(SIGALRM, grace_alarm_handler); | |
1677 | if (!debug_flag) | |
1678 | alarm(options.login_grace_time); | |
1679 | ||
1680 | sshd_exchange_identification(sock_in, sock_out); | |
7cac2b65 | 1681 | #if defined(AFS_KRB5) |
3c0ef626 | 1682 | /* If machine has AFS, set process authentication group. */ |
1683 | if (k_hasafs()) { | |
1684 | k_setpag(); | |
1685 | k_unlog(); | |
1686 | } | |
62eb343a | 1687 | #endif /* AFS || AFS_KRB5 */ |
3c0ef626 | 1688 | |
1689 | packet_set_nonblocking(); | |
1690 | ||
540d72c3 | 1691 | /* allocate authentication context */ |
1692 | authctxt = xmalloc(sizeof(*authctxt)); | |
1693 | memset(authctxt, 0, sizeof(*authctxt)); | |
1694 | ||
1695 | /* XXX global for cleanup, access from other modules */ | |
1696 | the_authctxt = authctxt; | |
1697 | ||
dfddba3d | 1698 | /* prepare buffer to collect messages to display to user after login */ |
1699 | buffer_init(&loginmsg); | |
1700 | ||
510132b6 | 1701 | if (use_privsep) |
540d72c3 | 1702 | if (privsep_preauth(authctxt) == 1) |
510132b6 | 1703 | goto authenticated; |
1704 | ||
3c0ef626 | 1705 | /* perform the key exchange */ |
1706 | /* authenticate user and start session */ | |
1707 | if (compat20) { | |
1708 | do_ssh2_kex(); | |
540d72c3 | 1709 | do_authentication2(authctxt); |
3c0ef626 | 1710 | } else { |
1711 | do_ssh1_kex(); | |
540d72c3 | 1712 | do_authentication(authctxt); |
510132b6 | 1713 | } |
1714 | /* | |
1715 | * If we use privilege separation, the unprivileged child transfers | |
1716 | * the current keystate and exits | |
1717 | */ | |
1718 | if (use_privsep) { | |
1719 | mm_send_keystate(pmonitor); | |
1720 | exit(0); | |
3c0ef626 | 1721 | } |
510132b6 | 1722 | |
1723 | authenticated: | |
dfddba3d | 1724 | #ifdef SSH_AUDIT_EVENTS |
1725 | audit_event(SSH_AUTH_SUCCESS); | |
1726 | #endif | |
1727 | ||
510132b6 | 1728 | /* |
1729 | * In privilege separation, we fork another child and prepare | |
1730 | * file descriptor passing. | |
1731 | */ | |
1732 | if (use_privsep) { | |
1733 | privsep_postauth(authctxt); | |
1734 | /* the monitor process [priv] will not return */ | |
1735 | if (!compat20) | |
1736 | destroy_sensitive_data(); | |
1737 | } | |
1738 | ||
540d72c3 | 1739 | /* Start session. */ |
510132b6 | 1740 | do_authenticated(authctxt); |
1741 | ||
3c0ef626 | 1742 | /* The connection has been terminated. */ |
1743 | verbose("Closing connection to %.100s", remote_ip); | |
1744 | ||
1745 | #ifdef USE_PAM | |
7cac2b65 | 1746 | if (options.use_pam) |
1747 | finish_pam(); | |
3c0ef626 | 1748 | #endif /* USE_PAM */ |
1749 | ||
dfddba3d | 1750 | #ifdef SSH_AUDIT_EVENTS |
1751 | PRIVSEP(audit_event(SSH_CONNECTION_CLOSE)); | |
1752 | #endif | |
1753 | ||
3c0ef626 | 1754 | packet_close(); |
510132b6 | 1755 | |
1756 | if (use_privsep) | |
1757 | mm_terminate(); | |
1758 | ||
3c0ef626 | 1759 | exit(0); |
1760 | } | |
1761 | ||
510132b6 | 1762 | /* |
1763 | * Decrypt session_key_int using our private server key and private host key | |
1764 | * (key with larger modulus first). | |
1765 | */ | |
1766 | int | |
1767 | ssh1_session_key(BIGNUM *session_key_int) | |
1768 | { | |
1769 | int rsafail = 0; | |
1770 | ||
1771 | if (BN_cmp(sensitive_data.server_key->rsa->n, sensitive_data.ssh1_host_key->rsa->n) > 0) { | |
1772 | /* Server key has bigger modulus. */ | |
1773 | if (BN_num_bits(sensitive_data.server_key->rsa->n) < | |
1774 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + SSH_KEY_BITS_RESERVED) { | |
1775 | fatal("do_connection: %s: server_key %d < host_key %d + SSH_KEY_BITS_RESERVED %d", | |
1776 | get_remote_ipaddr(), | |
1777 | BN_num_bits(sensitive_data.server_key->rsa->n), | |
1778 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n), | |
1779 | SSH_KEY_BITS_RESERVED); | |
1780 | } | |
1781 | if (rsa_private_decrypt(session_key_int, session_key_int, | |
1782 | sensitive_data.server_key->rsa) <= 0) | |
1783 | rsafail++; | |
1784 | if (rsa_private_decrypt(session_key_int, session_key_int, | |
1785 | sensitive_data.ssh1_host_key->rsa) <= 0) | |
1786 | rsafail++; | |
1787 | } else { | |
1788 | /* Host key has bigger modulus (or they are equal). */ | |
1789 | if (BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) < | |
1790 | BN_num_bits(sensitive_data.server_key->rsa->n) + SSH_KEY_BITS_RESERVED) { | |
1791 | fatal("do_connection: %s: host_key %d < server_key %d + SSH_KEY_BITS_RESERVED %d", | |
1792 | get_remote_ipaddr(), | |
1793 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n), | |
1794 | BN_num_bits(sensitive_data.server_key->rsa->n), | |
1795 | SSH_KEY_BITS_RESERVED); | |
1796 | } | |
1797 | if (rsa_private_decrypt(session_key_int, session_key_int, | |
1798 | sensitive_data.ssh1_host_key->rsa) < 0) | |
1799 | rsafail++; | |
1800 | if (rsa_private_decrypt(session_key_int, session_key_int, | |
1801 | sensitive_data.server_key->rsa) < 0) | |
1802 | rsafail++; | |
1803 | } | |
1804 | return (rsafail); | |
1805 | } | |
3c0ef626 | 1806 | /* |
1807 | * SSH1 key exchange | |
1808 | */ | |
1809 | static void | |
1810 | do_ssh1_kex(void) | |
1811 | { | |
1812 | int i, len; | |
3c0ef626 | 1813 | int rsafail = 0; |
1814 | BIGNUM *session_key_int; | |
1815 | u_char session_key[SSH_SESSION_KEY_LENGTH]; | |
1816 | u_char cookie[8]; | |
1817 | u_int cipher_type, auth_mask, protocol_flags; | |
d03f4262 | 1818 | u_int32_t rnd = 0; |
3c0ef626 | 1819 | |
1820 | /* | |
1821 | * Generate check bytes that the client must send back in the user | |
1822 | * packet in order for it to be accepted; this is used to defy ip | |
1823 | * spoofing attacks. Note that this only works against somebody | |
1824 | * doing IP spoofing from a remote machine; any machine on the local | |
1825 | * network can still see outgoing packets and catch the random | |
1826 | * cookie. This only affects rhosts authentication, and this is one | |
1827 | * of the reasons why it is inherently insecure. | |
1828 | */ | |
1829 | for (i = 0; i < 8; i++) { | |
1830 | if (i % 4 == 0) | |
d03f4262 | 1831 | rnd = arc4random(); |
1832 | cookie[i] = rnd & 0xff; | |
1833 | rnd >>= 8; | |
3c0ef626 | 1834 | } |
1835 | ||
1836 | /* | |
1837 | * Send our public key. We include in the packet 64 bits of random | |
1838 | * data that must be matched in the reply in order to prevent IP | |
1839 | * spoofing. | |
1840 | */ | |
1841 | packet_start(SSH_SMSG_PUBLIC_KEY); | |
1842 | for (i = 0; i < 8; i++) | |
1843 | packet_put_char(cookie[i]); | |
1844 | ||
1845 | /* Store our public server RSA key. */ | |
1846 | packet_put_int(BN_num_bits(sensitive_data.server_key->rsa->n)); | |
1847 | packet_put_bignum(sensitive_data.server_key->rsa->e); | |
1848 | packet_put_bignum(sensitive_data.server_key->rsa->n); | |
1849 | ||
1850 | /* Store our public host RSA key. */ | |
1851 | packet_put_int(BN_num_bits(sensitive_data.ssh1_host_key->rsa->n)); | |
1852 | packet_put_bignum(sensitive_data.ssh1_host_key->rsa->e); | |
1853 | packet_put_bignum(sensitive_data.ssh1_host_key->rsa->n); | |
1854 | ||
1855 | /* Put protocol flags. */ | |
1856 | packet_put_int(SSH_PROTOFLAG_HOST_IN_FWD_OPEN); | |
1857 | ||
1858 | /* Declare which ciphers we support. */ | |
1859 | packet_put_int(cipher_mask_ssh1(0)); | |
1860 | ||
1861 | /* Declare supported authentication types. */ | |
1862 | auth_mask = 0; | |
3c0ef626 | 1863 | if (options.rhosts_rsa_authentication) |
1864 | auth_mask |= 1 << SSH_AUTH_RHOSTS_RSA; | |
1865 | if (options.rsa_authentication) | |
1866 | auth_mask |= 1 << SSH_AUTH_RSA; | |
b59afbfe | 1867 | if (options.challenge_response_authentication == 1) |
1868 | auth_mask |= 1 << SSH_AUTH_TIS; | |
3c0ef626 | 1869 | if (options.password_authentication) |
1870 | auth_mask |= 1 << SSH_AUTH_PASSWORD; | |
1871 | packet_put_int(auth_mask); | |
1872 | ||
1873 | /* Send the packet and wait for it to be sent. */ | |
1874 | packet_send(); | |
1875 | packet_write_wait(); | |
1876 | ||
1877 | debug("Sent %d bit server key and %d bit host key.", | |
1878 | BN_num_bits(sensitive_data.server_key->rsa->n), | |
1879 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n)); | |
1880 | ||
1881 | /* Read clients reply (cipher type and session key). */ | |
1e608e42 | 1882 | packet_read_expect(SSH_CMSG_SESSION_KEY); |
3c0ef626 | 1883 | |
1884 | /* Get cipher type and check whether we accept this. */ | |
1885 | cipher_type = packet_get_char(); | |
1886 | ||
1887 | if (!(cipher_mask_ssh1(0) & (1 << cipher_type))) | |
1888 | packet_disconnect("Warning: client selects unsupported cipher."); | |
1889 | ||
1890 | /* Get check bytes from the packet. These must match those we | |
1891 | sent earlier with the public key packet. */ | |
1892 | for (i = 0; i < 8; i++) | |
1893 | if (cookie[i] != packet_get_char()) | |
1894 | packet_disconnect("IP Spoofing check bytes do not match."); | |
1895 | ||
1896 | debug("Encryption type: %.200s", cipher_name(cipher_type)); | |
1897 | ||
1898 | /* Get the encrypted integer. */ | |
1e608e42 | 1899 | if ((session_key_int = BN_new()) == NULL) |
1900 | fatal("do_ssh1_kex: BN_new failed"); | |
1901 | packet_get_bignum(session_key_int); | |
3c0ef626 | 1902 | |
1903 | protocol_flags = packet_get_int(); | |
1904 | packet_set_protocol_flags(protocol_flags); | |
1e608e42 | 1905 | packet_check_eom(); |
3c0ef626 | 1906 | |
510132b6 | 1907 | /* Decrypt session_key_int using host/server keys */ |
1908 | rsafail = PRIVSEP(ssh1_session_key(session_key_int)); | |
1909 | ||
3c0ef626 | 1910 | /* |
1911 | * Extract session key from the decrypted integer. The key is in the | |
1912 | * least significant 256 bits of the integer; the first byte of the | |
1913 | * key is in the highest bits. | |
1914 | */ | |
1915 | if (!rsafail) { | |
1916 | BN_mask_bits(session_key_int, sizeof(session_key) * 8); | |
1917 | len = BN_num_bytes(session_key_int); | |
1918 | if (len < 0 || len > sizeof(session_key)) { | |
1919 | error("do_connection: bad session key len from %s: " | |
1920 | "session_key_int %d > sizeof(session_key) %lu", | |
1921 | get_remote_ipaddr(), len, (u_long)sizeof(session_key)); | |
1922 | rsafail++; | |
1923 | } else { | |
1924 | memset(session_key, 0, sizeof(session_key)); | |
1925 | BN_bn2bin(session_key_int, | |
1926 | session_key + sizeof(session_key) - len); | |
1927 | ||
7e82606e | 1928 | derive_ssh1_session_id( |
3c0ef626 | 1929 | sensitive_data.ssh1_host_key->rsa->n, |
7e82606e | 1930 | sensitive_data.server_key->rsa->n, |
1931 | cookie, session_id); | |
3c0ef626 | 1932 | /* |
1933 | * Xor the first 16 bytes of the session key with the | |
1934 | * session id. | |
1935 | */ | |
1936 | for (i = 0; i < 16; i++) | |
1937 | session_key[i] ^= session_id[i]; | |
1938 | } | |
1939 | } | |
1940 | if (rsafail) { | |
1941 | int bytes = BN_num_bytes(session_key_int); | |
1e608e42 | 1942 | u_char *buf = xmalloc(bytes); |
3c0ef626 | 1943 | MD5_CTX md; |
1944 | ||
7cac2b65 | 1945 | logit("do_connection: generating a fake encryption key"); |
3c0ef626 | 1946 | BN_bn2bin(session_key_int, buf); |
1947 | MD5_Init(&md); | |
1948 | MD5_Update(&md, buf, bytes); | |
1949 | MD5_Update(&md, sensitive_data.ssh1_cookie, SSH_SESSION_KEY_LENGTH); | |
1950 | MD5_Final(session_key, &md); | |
1951 | MD5_Init(&md); | |
1952 | MD5_Update(&md, session_key, 16); | |
1953 | MD5_Update(&md, buf, bytes); | |
1954 | MD5_Update(&md, sensitive_data.ssh1_cookie, SSH_SESSION_KEY_LENGTH); | |
1955 | MD5_Final(session_key + 16, &md); | |
1956 | memset(buf, 0, bytes); | |
1957 | xfree(buf); | |
1958 | for (i = 0; i < 16; i++) | |
1959 | session_id[i] = session_key[i] ^ session_key[i + 16]; | |
1960 | } | |
510132b6 | 1961 | /* Destroy the private and public keys. No longer. */ |
3c0ef626 | 1962 | destroy_sensitive_data(); |
1963 | ||
510132b6 | 1964 | if (use_privsep) |
1965 | mm_ssh1_session_id(session_id); | |
1966 | ||
3c0ef626 | 1967 | /* Destroy the decrypted integer. It is no longer needed. */ |
1968 | BN_clear_free(session_key_int); | |
1969 | ||
1970 | /* Set the session key. From this on all communications will be encrypted. */ | |
1971 | packet_set_encryption_key(session_key, SSH_SESSION_KEY_LENGTH, cipher_type); | |
1972 | ||
1973 | /* Destroy our copy of the session key. It is no longer needed. */ | |
1974 | memset(session_key, 0, sizeof(session_key)); | |
1975 | ||
1976 | debug("Received session key; encryption turned on."); | |
1977 | ||
44a053a3 | 1978 | /* Send an acknowledgment packet. Note that this packet is sent encrypted. */ |
3c0ef626 | 1979 | packet_start(SSH_SMSG_SUCCESS); |
1980 | packet_send(); | |
1981 | packet_write_wait(); | |
1982 | } | |
1983 | ||
1984 | /* | |
1985 | * SSH2 key exchange: diffie-hellman-group1-sha1 | |
1986 | */ | |
1987 | static void | |
1988 | do_ssh2_kex(void) | |
1989 | { | |
1990 | Kex *kex; | |
1991 | ||
1992 | if (options.ciphers != NULL) { | |
1993 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
1994 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
1995 | } | |
1996 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
1997 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
1998 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
1999 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
2000 | ||
2001 | if (options.macs != NULL) { | |
2002 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
2003 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
2004 | } | |
44a053a3 | 2005 | if (!options.compression) { |
2006 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = | |
2007 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; | |
2008 | } | |
3c0ef626 | 2009 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = list_hostkey_types(); |
2010 | ||
5598e598 | 2011 | #ifdef GSSAPI |
2012 | { | |
2013 | char *orig; | |
2014 | char *gss = NULL; | |
2015 | char *newstr = NULL; | |
2016 | orig = myproposal[PROPOSAL_KEX_ALGS]; | |
2017 | ||
2018 | /* If we don't have a host key, then all of the algorithms | |
2019 | * currently in myproposal are useless */ | |
2020 | if (strlen(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS])==0) | |
2021 | orig= NULL; | |
2022 | ||
2023 | if (options.gss_keyex) | |
23987cb8 | 2024 | gss = ssh_gssapi_server_mechanisms(); |
5598e598 | 2025 | else |
2026 | gss = NULL; | |
2027 | ||
2028 | if (gss && orig) { | |
2029 | int len = strlen(orig) + strlen(gss) +2; | |
2030 | newstr=xmalloc(len); | |
2031 | snprintf(newstr,len,"%s,%s",gss,orig); | |
2032 | } else if (gss) { | |
2033 | newstr=gss; | |
2034 | } else if (orig) { | |
2035 | newstr=orig; | |
2036 | } | |
2037 | /* If we've got GSSAPI mechanisms, then we've also got the 'null' | |
2038 | host key algorithm, but we're not allowed to advertise it, unless | |
2039 | its the only host key algorithm we're supporting */ | |
2040 | if (gss && (strlen(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS])) == 0) { | |
2041 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]="null"; | |
2042 | } | |
2043 | if (newstr) | |
2044 | myproposal[PROPOSAL_KEX_ALGS]=newstr; | |
2045 | else | |
2046 | fatal("No supported key exchange algorithms"); | |
2047 | } | |
2048 | #endif | |
2049 | ||
3c0ef626 | 2050 | /* start key exchange */ |
2051 | kex = kex_setup(myproposal); | |
bfe49944 | 2052 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
7e82606e | 2053 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
bfe49944 | 2054 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2055 | #ifdef GSSAPI | |
2056 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server; | |
2057 | #endif | |
3c0ef626 | 2058 | kex->server = 1; |
2059 | kex->client_version_string=client_version_string; | |
2060 | kex->server_version_string=server_version_string; | |
2061 | kex->load_host_key=&get_hostkey_by_type; | |
510132b6 | 2062 | kex->host_key_index=&get_hostkey_index; |
3c0ef626 | 2063 | |
2064 | xxx_kex = kex; | |
2065 | ||
2066 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); | |
2067 | ||
2068 | session_id2 = kex->session_id; | |
2069 | session_id2_len = kex->session_id_len; | |
2070 | ||
2071 | #ifdef DEBUG_KEXDH | |
2072 | /* send 1st encrypted/maced/compressed message */ | |
2073 | packet_start(SSH2_MSG_IGNORE); | |
2074 | packet_put_cstring("markus"); | |
2075 | packet_send(); | |
2076 | packet_write_wait(); | |
2077 | #endif | |
2078 | debug("KEX done"); | |
2079 | } | |
540d72c3 | 2080 | |
2081 | /* server specific fatal cleanup */ | |
2082 | void | |
2083 | cleanup_exit(int i) | |
2084 | { | |
2085 | if (the_authctxt) | |
2086 | do_cleanup(the_authctxt); | |
dfddba3d | 2087 | #ifdef SSH_AUDIT_EVENTS |
2088 | /* done after do_cleanup so it can cancel the PAM auth 'thread' */ | |
2089 | if (!use_privsep || mm_is_monitor()) | |
2090 | audit_event(SSH_CONNECTION_ABANDON); | |
2091 | #endif | |
540d72c3 | 2092 | _exit(i); |
2093 | } |