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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
bcbf86ec | 5 | * This program is the ssh daemon. It listens for connections from clients, |
6 | * and performs authentication, executes use commands or shell, and forwards | |
5260325f | 7 | * information to/from the application to the user client over an encrypted |
bcbf86ec | 8 | * connection. This can also handle forwarding of X11, TCP/IP, and |
9 | * authentication agent connections. | |
e78a59f5 | 10 | * |
bcbf86ec | 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: | |
18 | * | |
19 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
9ae3f727 | 43 | RCSID("$OpenBSD: sshd.c,v 1.207 2001/10/24 08:41:41 markus Exp $"); |
8efc0c15 | 44 | |
42f11eb2 | 45 | #include <openssl/dh.h> |
46 | #include <openssl/bn.h> | |
47 | #include <openssl/hmac.h> | |
48 | ||
49 | #include "ssh.h" | |
50 | #include "ssh1.h" | |
51 | #include "ssh2.h" | |
8efc0c15 | 52 | #include "xmalloc.h" |
53 | #include "rsa.h" | |
1729c161 | 54 | #include "sshpty.h" |
8efc0c15 | 55 | #include "packet.h" |
8efc0c15 | 56 | #include "mpaux.h" |
42f11eb2 | 57 | #include "log.h" |
8efc0c15 | 58 | #include "servconf.h" |
59 | #include "uidswap.h" | |
60 | #include "compat.h" | |
7368a6c8 | 61 | #include "buffer.h" |
42f11eb2 | 62 | #include "cipher.h" |
e78a59f5 | 63 | #include "kex.h" |
7368a6c8 | 64 | #include "key.h" |
94ec8c6b | 65 | #include "dh.h" |
e78a59f5 | 66 | #include "myproposal.h" |
a306f2dd | 67 | #include "authfile.h" |
42f11eb2 | 68 | #include "pathnames.h" |
69 | #include "atomicio.h" | |
70 | #include "canohost.h" | |
71 | #include "auth.h" | |
72 | #include "misc.h" | |
a5c9ffdb | 73 | #include "dispatch.h" |
e4d7f734 | 74 | #include "channels.h" |
8efc0c15 | 75 | |
76 | #ifdef LIBWRAP | |
77 | #include <tcpd.h> | |
78 | #include <syslog.h> | |
79 | int allow_severity = LOG_INFO; | |
80 | int deny_severity = LOG_WARNING; | |
81 | #endif /* LIBWRAP */ | |
82 | ||
83 | #ifndef O_NOCTTY | |
84 | #define O_NOCTTY 0 | |
85 | #endif | |
86 | ||
260d427b | 87 | #ifdef HAVE___PROGNAME |
88 | extern char *__progname; | |
89 | #else | |
90 | char *__progname; | |
91 | #endif | |
92 | ||
8efc0c15 | 93 | /* Server configuration options. */ |
94 | ServerOptions options; | |
95 | ||
96 | /* Name of the server configuration file. */ | |
42f11eb2 | 97 | char *config_file_name = _PATH_SERVER_CONFIG_FILE; |
8efc0c15 | 98 | |
6ae2364d | 99 | /* |
48e671d5 | 100 | * Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
101 | * Default value is AF_UNSPEC means both IPv4 and IPv6. | |
102 | */ | |
59e76f33 | 103 | #ifdef IPV4_DEFAULT |
104 | int IPv4or6 = AF_INET; | |
105 | #else | |
48e671d5 | 106 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 107 | #endif |
48e671d5 | 108 | |
5260325f | 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 | */ | |
8efc0c15 | 115 | int debug_flag = 0; |
116 | ||
f87f09aa | 117 | /* Flag indicating that the daemon should only test the configuration and keys. */ |
118 | int test_flag = 0; | |
119 | ||
8efc0c15 | 120 | /* Flag indicating that the daemon is being started from inetd. */ |
121 | int inetd_flag = 0; | |
122 | ||
0b6fbf03 | 123 | /* Flag indicating that sshd should not detach and become a daemon. */ |
124 | int no_daemon_flag = 0; | |
125 | ||
6a17f9c2 | 126 | /* debug goes to stderr unless inetd_flag is set */ |
127 | int log_stderr = 0; | |
128 | ||
8efc0c15 | 129 | /* Saved arguments to main(). */ |
130 | char **saved_argv; | |
4d33e531 | 131 | int saved_argc; |
8efc0c15 | 132 | |
aa3378df | 133 | /* |
48e671d5 | 134 | * The sockets that the server is listening; this is used in the SIGHUP |
135 | * signal handler. | |
aa3378df | 136 | */ |
48e671d5 | 137 | #define MAX_LISTEN_SOCKS 16 |
138 | int listen_socks[MAX_LISTEN_SOCKS]; | |
139 | int num_listen_socks = 0; | |
8efc0c15 | 140 | |
aa3378df | 141 | /* |
142 | * the client's version string, passed by sshd2 in compat mode. if != NULL, | |
143 | * sshd will skip the version-number exchange | |
144 | */ | |
5260325f | 145 | char *client_version_string = NULL; |
7368a6c8 | 146 | char *server_version_string = NULL; |
8efc0c15 | 147 | |
7a37c112 | 148 | /* for rekeying XXX fixme */ |
149 | Kex *xxx_kex; | |
150 | ||
aa3378df | 151 | /* |
152 | * Any really sensitive data in the application is contained in this | |
153 | * structure. The idea is that this structure could be locked into memory so | |
154 | * that the pages do not get written into swap. However, there are some | |
155 | * problems. The private key contains BIGNUMs, and we do not (in principle) | |
156 | * have access to the internals of them, and locking just the structure is | |
157 | * not very useful. Currently, memory locking is not implemented. | |
158 | */ | |
5260325f | 159 | struct { |
cb7bd922 | 160 | Key *server_key; /* ephemeral server key */ |
fa08c86b | 161 | Key *ssh1_host_key; /* ssh1 host key */ |
162 | Key **host_keys; /* all private host keys */ | |
163 | int have_ssh1_key; | |
164 | int have_ssh2_key; | |
00be5382 | 165 | u_char ssh1_cookie[SSH_SESSION_KEY_LENGTH]; |
8efc0c15 | 166 | } sensitive_data; |
167 | ||
aa3378df | 168 | /* |
59c97189 | 169 | * Flag indicating whether the RSA server key needs to be regenerated. |
170 | * Is set in the SIGALRM handler and cleared when the key is regenerated. | |
aa3378df | 171 | */ |
59c97189 | 172 | int key_do_regen = 0; |
8efc0c15 | 173 | |
c9130033 | 174 | /* This is set to true when a signal is received. */ |
8efc0c15 | 175 | int received_sighup = 0; |
c9130033 | 176 | int received_sigterm = 0; |
8efc0c15 | 177 | |
7368a6c8 | 178 | /* session identifier, used by RSA-auth */ |
1e3b8b07 | 179 | u_char session_id[16]; |
e7c0f9d5 | 180 | |
a306f2dd | 181 | /* same for ssh2 */ |
1e3b8b07 | 182 | u_char *session_id2 = NULL; |
a306f2dd | 183 | int session_id2_len = 0; |
184 | ||
c345cf9d | 185 | /* record remote hostname or ip */ |
1e3b8b07 | 186 | u_int utmp_len = MAXHOSTNAMELEN; |
c345cf9d | 187 | |
7368a6c8 | 188 | /* Prototypes for various functions defined later in this file. */ |
396c147e | 189 | void destroy_sensitive_data(void); |
c8d54615 | 190 | |
396c147e | 191 | static void do_ssh1_kex(void); |
192 | static void do_ssh2_kex(void); | |
94ec8c6b | 193 | |
48e671d5 | 194 | /* |
195 | * Close all listening sockets | |
196 | */ | |
396c147e | 197 | static void |
48e671d5 | 198 | close_listen_socks(void) |
199 | { | |
200 | int i; | |
201 | for (i = 0; i < num_listen_socks; i++) | |
202 | close(listen_socks[i]); | |
203 | num_listen_socks = -1; | |
204 | } | |
205 | ||
5260325f | 206 | /* |
207 | * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP; | |
208 | * the effect is to reread the configuration file (and to regenerate | |
209 | * the server key). | |
210 | */ | |
396c147e | 211 | static void |
5260325f | 212 | sighup_handler(int sig) |
8efc0c15 | 213 | { |
5260325f | 214 | received_sighup = 1; |
215 | signal(SIGHUP, sighup_handler); | |
8efc0c15 | 216 | } |
217 | ||
5260325f | 218 | /* |
219 | * Called from the main program after receiving SIGHUP. | |
220 | * Restarts the server. | |
221 | */ | |
396c147e | 222 | static void |
5ca51e19 | 223 | sighup_restart(void) |
8efc0c15 | 224 | { |
5260325f | 225 | log("Received SIGHUP; restarting."); |
48e671d5 | 226 | close_listen_socks(); |
5260325f | 227 | execv(saved_argv[0], saved_argv); |
1fe6a48f | 228 | log("RESTART FAILED: av[0]='%.100s', error: %.100s.", saved_argv[0], strerror(errno)); |
5260325f | 229 | exit(1); |
8efc0c15 | 230 | } |
231 | ||
5260325f | 232 | /* |
233 | * Generic signal handler for terminating signals in the master daemon. | |
5260325f | 234 | */ |
396c147e | 235 | static void |
5260325f | 236 | sigterm_handler(int sig) |
8efc0c15 | 237 | { |
c9130033 | 238 | received_sigterm = sig; |
8efc0c15 | 239 | } |
240 | ||
5260325f | 241 | /* |
242 | * SIGCHLD handler. This is called whenever a child dies. This will then | |
c9130033 | 243 | * reap any zombies left by exited children. |
5260325f | 244 | */ |
396c147e | 245 | static void |
5260325f | 246 | main_sigchld_handler(int sig) |
8efc0c15 | 247 | { |
5260325f | 248 | int save_errno = errno; |
249 | int status; | |
5ad13cd7 | 250 | |
5260325f | 251 | while (waitpid(-1, &status, WNOHANG) > 0) |
252 | ; | |
5ad13cd7 | 253 | |
5260325f | 254 | signal(SIGCHLD, main_sigchld_handler); |
255 | errno = save_errno; | |
8efc0c15 | 256 | } |
257 | ||
5260325f | 258 | /* |
259 | * Signal handler for the alarm after the login grace period has expired. | |
260 | */ | |
396c147e | 261 | static void |
5260325f | 262 | grace_alarm_handler(int sig) |
8efc0c15 | 263 | { |
c9130033 | 264 | /* XXX no idea how fix this signal handler */ |
265 | ||
5260325f | 266 | /* Close the connection. */ |
267 | packet_close(); | |
8efc0c15 | 268 | |
5260325f | 269 | /* Log error and exit. */ |
270 | fatal("Timeout before authentication for %s.", get_remote_ipaddr()); | |
271 | } | |
8efc0c15 | 272 | |
5260325f | 273 | /* |
274 | * Signal handler for the key regeneration alarm. Note that this | |
275 | * alarm only occurs in the daemon waiting for connections, and it does not | |
276 | * do anything with the private key or random state before forking. | |
277 | * Thus there should be no concurrency control/asynchronous execution | |
278 | * problems. | |
279 | */ | |
396c147e | 280 | static void |
cb7bd922 | 281 | generate_ephemeral_server_key(void) |
fa08c86b | 282 | { |
00be5382 | 283 | u_int32_t rand = 0; |
284 | int i; | |
285 | ||
cd332296 | 286 | verbose("Generating %s%d bit RSA key.", |
76ca7b01 | 287 | sensitive_data.server_key ? "new " : "", options.server_key_bits); |
fa08c86b | 288 | if (sensitive_data.server_key != NULL) |
289 | key_free(sensitive_data.server_key); | |
cd332296 | 290 | sensitive_data.server_key = key_generate(KEY_RSA1, |
76ca7b01 | 291 | options.server_key_bits); |
292 | verbose("RSA key generation complete."); | |
00be5382 | 293 | |
294 | for (i = 0; i < SSH_SESSION_KEY_LENGTH; i++) { | |
295 | if (i % 4 == 0) | |
296 | rand = arc4random(); | |
297 | sensitive_data.ssh1_cookie[i] = rand & 0xff; | |
298 | rand >>= 8; | |
299 | } | |
300 | arc4random_stir(); | |
fa08c86b | 301 | } |
f546c780 | 302 | |
396c147e | 303 | static void |
5260325f | 304 | key_regeneration_alarm(int sig) |
305 | { | |
306 | int save_errno = errno; | |
59c97189 | 307 | signal(SIGALRM, SIG_DFL); |
5260325f | 308 | errno = save_errno; |
59c97189 | 309 | key_do_regen = 1; |
5260325f | 310 | } |
8efc0c15 | 311 | |
396c147e | 312 | static void |
7368a6c8 | 313 | sshd_exchange_identification(int sock_in, int sock_out) |
314 | { | |
a8be9f80 | 315 | int i, mismatch; |
7368a6c8 | 316 | int remote_major, remote_minor; |
a8be9f80 | 317 | int major, minor; |
7368a6c8 | 318 | char *s; |
319 | char buf[256]; /* Must not be larger than remote_version. */ | |
320 | char remote_version[256]; /* Must be at least as big as buf. */ | |
321 | ||
a8be9f80 | 322 | if ((options.protocol & SSH_PROTO_1) && |
323 | (options.protocol & SSH_PROTO_2)) { | |
324 | major = PROTOCOL_MAJOR_1; | |
325 | minor = 99; | |
326 | } else if (options.protocol & SSH_PROTO_2) { | |
327 | major = PROTOCOL_MAJOR_2; | |
328 | minor = PROTOCOL_MINOR_2; | |
329 | } else { | |
330 | major = PROTOCOL_MAJOR_1; | |
331 | minor = PROTOCOL_MINOR_1; | |
332 | } | |
333 | snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", major, minor, SSH_VERSION); | |
7368a6c8 | 334 | server_version_string = xstrdup(buf); |
335 | ||
336 | if (client_version_string == NULL) { | |
337 | /* Send our protocol version identification. */ | |
338 | if (atomicio(write, sock_out, server_version_string, strlen(server_version_string)) | |
339 | != strlen(server_version_string)) { | |
340 | log("Could not write ident string to %s.", get_remote_ipaddr()); | |
341 | fatal_cleanup(); | |
342 | } | |
343 | ||
2ce1adf9 | 344 | /* Read other side's version identification. */ |
cd332296 | 345 | memset(buf, 0, sizeof(buf)); |
7368a6c8 | 346 | for (i = 0; i < sizeof(buf) - 1; i++) { |
e5a0294f | 347 | if (atomicio(read, sock_in, &buf[i], 1) != 1) { |
c2b544a5 | 348 | log("Did not receive identification string from %s.", |
349 | get_remote_ipaddr()); | |
7368a6c8 | 350 | fatal_cleanup(); |
351 | } | |
352 | if (buf[i] == '\r') { | |
8a169574 | 353 | buf[i] = 0; |
94ec8c6b | 354 | /* Kludge for F-Secure Macintosh < 1.0.2 */ |
355 | if (i == 12 && | |
356 | strncmp(buf, "SSH-1.5-W1.0", 12) == 0) | |
357 | break; | |
7368a6c8 | 358 | continue; |
7368a6c8 | 359 | } |
360 | if (buf[i] == '\n') { | |
8a169574 | 361 | buf[i] = 0; |
7368a6c8 | 362 | break; |
363 | } | |
364 | } | |
365 | buf[sizeof(buf) - 1] = 0; | |
366 | client_version_string = xstrdup(buf); | |
367 | } | |
368 | ||
369 | /* | |
370 | * Check that the versions match. In future this might accept | |
371 | * several versions and set appropriate flags to handle them. | |
372 | */ | |
373 | if (sscanf(client_version_string, "SSH-%d.%d-%[^\n]\n", | |
374 | &remote_major, &remote_minor, remote_version) != 3) { | |
6ae2364d | 375 | s = "Protocol mismatch.\n"; |
7368a6c8 | 376 | (void) atomicio(write, sock_out, s, strlen(s)); |
377 | close(sock_in); | |
378 | close(sock_out); | |
379 | log("Bad protocol version identification '%.100s' from %s", | |
380 | client_version_string, get_remote_ipaddr()); | |
381 | fatal_cleanup(); | |
382 | } | |
383 | debug("Client protocol version %d.%d; client software version %.100s", | |
384 | remote_major, remote_minor, remote_version); | |
385 | ||
e78a59f5 | 386 | compat_datafellows(remote_version); |
387 | ||
3a1c54d4 | 388 | if (datafellows & SSH_BUG_SCANNER) { |
389 | log("scanned from %s with %s. Don't panic.", | |
390 | get_remote_ipaddr(), client_version_string); | |
391 | fatal_cleanup(); | |
392 | } | |
393 | ||
a8be9f80 | 394 | mismatch = 0; |
7368a6c8 | 395 | switch(remote_major) { |
396 | case 1: | |
a306f2dd | 397 | if (remote_minor == 99) { |
398 | if (options.protocol & SSH_PROTO_2) | |
399 | enable_compat20(); | |
400 | else | |
401 | mismatch = 1; | |
402 | break; | |
403 | } | |
a8be9f80 | 404 | if (!(options.protocol & SSH_PROTO_1)) { |
405 | mismatch = 1; | |
406 | break; | |
407 | } | |
7368a6c8 | 408 | if (remote_minor < 3) { |
089fbbd2 | 409 | packet_disconnect("Your ssh version is too old and " |
7368a6c8 | 410 | "is no longer supported. Please install a newer version."); |
411 | } else if (remote_minor == 3) { | |
412 | /* note that this disables agent-forwarding */ | |
413 | enable_compat13(); | |
414 | } | |
a8be9f80 | 415 | break; |
e78a59f5 | 416 | case 2: |
a8be9f80 | 417 | if (options.protocol & SSH_PROTO_2) { |
e78a59f5 | 418 | enable_compat20(); |
419 | break; | |
420 | } | |
421 | /* FALLTHROUGH */ | |
6ae2364d | 422 | default: |
a8be9f80 | 423 | mismatch = 1; |
424 | break; | |
425 | } | |
426 | chop(server_version_string); | |
a8be9f80 | 427 | debug("Local version string %.200s", server_version_string); |
428 | ||
429 | if (mismatch) { | |
7368a6c8 | 430 | s = "Protocol major versions differ.\n"; |
431 | (void) atomicio(write, sock_out, s, strlen(s)); | |
432 | close(sock_in); | |
433 | close(sock_out); | |
a8be9f80 | 434 | log("Protocol major versions differ for %s: %.200s vs. %.200s", |
435 | get_remote_ipaddr(), | |
436 | server_version_string, client_version_string); | |
7368a6c8 | 437 | fatal_cleanup(); |
7368a6c8 | 438 | } |
a306f2dd | 439 | } |
440 | ||
441 | ||
fa08c86b | 442 | /* Destroy the host and server keys. They will no longer be needed. */ |
a306f2dd | 443 | void |
444 | destroy_sensitive_data(void) | |
445 | { | |
fa08c86b | 446 | int i; |
447 | ||
448 | if (sensitive_data.server_key) { | |
449 | key_free(sensitive_data.server_key); | |
450 | sensitive_data.server_key = NULL; | |
451 | } | |
2b87da3b | 452 | for(i = 0; i < options.num_host_key_files; i++) { |
fa08c86b | 453 | if (sensitive_data.host_keys[i]) { |
454 | key_free(sensitive_data.host_keys[i]); | |
455 | sensitive_data.host_keys[i] = NULL; | |
456 | } | |
457 | } | |
458 | sensitive_data.ssh1_host_key = NULL; | |
00be5382 | 459 | memset(sensitive_data.ssh1_cookie, 0, SSH_SESSION_KEY_LENGTH); |
fa08c86b | 460 | } |
fa08c86b | 461 | |
396c147e | 462 | static char * |
fa08c86b | 463 | list_hostkey_types(void) |
464 | { | |
465 | static char buf[1024]; | |
466 | int i; | |
467 | buf[0] = '\0'; | |
468 | for(i = 0; i < options.num_host_key_files; i++) { | |
469 | Key *key = sensitive_data.host_keys[i]; | |
470 | if (key == NULL) | |
471 | continue; | |
472 | switch(key->type) { | |
473 | case KEY_RSA: | |
474 | case KEY_DSA: | |
475 | strlcat(buf, key_ssh_name(key), sizeof buf); | |
476 | strlcat(buf, ",", sizeof buf); | |
477 | break; | |
478 | } | |
479 | } | |
480 | i = strlen(buf); | |
481 | if (i > 0 && buf[i-1] == ',') | |
482 | buf[i-1] = '\0'; | |
483 | debug("list_hostkey_types: %s", buf); | |
484 | return buf; | |
485 | } | |
486 | ||
396c147e | 487 | static Key * |
fa08c86b | 488 | get_hostkey_by_type(int type) |
489 | { | |
490 | int i; | |
491 | for(i = 0; i < options.num_host_key_files; i++) { | |
492 | Key *key = sensitive_data.host_keys[i]; | |
493 | if (key != NULL && key->type == type) | |
494 | return key; | |
495 | } | |
496 | return NULL; | |
7368a6c8 | 497 | } |
498 | ||
c345cf9d | 499 | /* |
500 | * returns 1 if connection should be dropped, 0 otherwise. | |
501 | * dropping starts at connection #max_startups_begin with a probability | |
502 | * of (max_startups_rate/100). the probability increases linearly until | |
503 | * all connections are dropped for startups > max_startups | |
504 | */ | |
396c147e | 505 | static int |
c345cf9d | 506 | drop_connection(int startups) |
507 | { | |
508 | double p, r; | |
509 | ||
510 | if (startups < options.max_startups_begin) | |
511 | return 0; | |
512 | if (startups >= options.max_startups) | |
513 | return 1; | |
514 | if (options.max_startups_rate == 100) | |
515 | return 1; | |
516 | ||
517 | p = 100 - options.max_startups_rate; | |
518 | p *= startups - options.max_startups_begin; | |
519 | p /= (double) (options.max_startups - options.max_startups_begin); | |
520 | p += options.max_startups_rate; | |
521 | p /= 100.0; | |
522 | r = arc4random() / (double) UINT_MAX; | |
523 | ||
524 | debug("drop_connection: p %g, r %g", p, r); | |
525 | return (r < p) ? 1 : 0; | |
526 | } | |
527 | ||
089fbbd2 | 528 | int *startup_pipes = NULL; /* options.max_startup sized array of fd ints */ |
529 | int startup_pipe; /* in child */ | |
530 | ||
5260325f | 531 | /* |
532 | * Main program for the daemon. | |
533 | */ | |
8efc0c15 | 534 | int |
535 | main(int ac, char **av) | |
536 | { | |
5260325f | 537 | extern char *optarg; |
538 | extern int optind; | |
089fbbd2 | 539 | int opt, sock_in = 0, sock_out = 0, newsock, j, i, fdsetsz, on = 1; |
9da5c3c9 | 540 | pid_t pid; |
48e671d5 | 541 | socklen_t fromlen; |
48e671d5 | 542 | fd_set *fdset; |
543 | struct sockaddr_storage from; | |
5260325f | 544 | const char *remote_ip; |
545 | int remote_port; | |
5260325f | 546 | FILE *f; |
547 | struct linger linger; | |
48e671d5 | 548 | struct addrinfo *ai; |
549 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
550 | int listen_sock, maxfd; | |
089fbbd2 | 551 | int startup_p[2]; |
552 | int startups = 0; | |
aeaa3d9e | 553 | Key *key; |
59c97189 | 554 | int ret, key_used = 0; |
5260325f | 555 | |
260d427b | 556 | __progname = get_progname(av[0]); |
264dce47 | 557 | init_rng(); |
558 | ||
1fe6a48f | 559 | /* Save argv. */ |
4d33e531 | 560 | saved_argc = ac; |
5260325f | 561 | saved_argv = av; |
5260325f | 562 | |
563 | /* Initialize configuration options to their default values. */ | |
564 | initialize_server_options(&options); | |
565 | ||
566 | /* Parse command-line arguments. */ | |
f87f09aa | 567 | while ((opt = getopt(ac, av, "f:p:b:k:h:g:V:u:dDeiqtQ46")) != -1) { |
5260325f | 568 | switch (opt) { |
48e671d5 | 569 | case '4': |
570 | IPv4or6 = AF_INET; | |
571 | break; | |
572 | case '6': | |
573 | IPv4or6 = AF_INET6; | |
574 | break; | |
5260325f | 575 | case 'f': |
576 | config_file_name = optarg; | |
577 | break; | |
578 | case 'd': | |
bcbf86ec | 579 | if (0 == debug_flag) { |
580 | debug_flag = 1; | |
581 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
582 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
583 | options.log_level++; | |
584 | } else { | |
585 | fprintf(stderr, "Too high debugging level.\n"); | |
586 | exit(1); | |
587 | } | |
5260325f | 588 | break; |
0b6fbf03 | 589 | case 'D': |
590 | no_daemon_flag = 1; | |
591 | break; | |
ff14faf1 | 592 | case 'e': |
593 | log_stderr = 1; | |
594 | break; | |
5260325f | 595 | case 'i': |
596 | inetd_flag = 1; | |
597 | break; | |
598 | case 'Q': | |
9bd5b720 | 599 | /* ignored */ |
5260325f | 600 | break; |
601 | case 'q': | |
602 | options.log_level = SYSLOG_LEVEL_QUIET; | |
603 | break; | |
604 | case 'b': | |
605 | options.server_key_bits = atoi(optarg); | |
606 | break; | |
607 | case 'p': | |
48e671d5 | 608 | options.ports_from_cmdline = 1; |
bcbf86ec | 609 | if (options.num_ports >= MAX_PORTS) { |
610 | fprintf(stderr, "too many ports.\n"); | |
611 | exit(1); | |
612 | } | |
2d2a2c65 | 613 | options.ports[options.num_ports++] = a2port(optarg); |
614 | if (options.ports[options.num_ports-1] == 0) { | |
615 | fprintf(stderr, "Bad port number.\n"); | |
616 | exit(1); | |
617 | } | |
5260325f | 618 | break; |
619 | case 'g': | |
e2b1fb42 | 620 | if ((options.login_grace_time = convtime(optarg)) == -1) { |
621 | fprintf(stderr, "Invalid login grace time.\n"); | |
622 | exit(1); | |
623 | } | |
5260325f | 624 | break; |
625 | case 'k': | |
e2b1fb42 | 626 | if ((options.key_regeneration_time = convtime(optarg)) == -1) { |
627 | fprintf(stderr, "Invalid key regeneration interval.\n"); | |
628 | exit(1); | |
629 | } | |
5260325f | 630 | break; |
631 | case 'h': | |
fa08c86b | 632 | if (options.num_host_key_files >= MAX_HOSTKEYS) { |
633 | fprintf(stderr, "too many host keys.\n"); | |
634 | exit(1); | |
635 | } | |
636 | options.host_key_files[options.num_host_key_files++] = optarg; | |
5260325f | 637 | break; |
638 | case 'V': | |
639 | client_version_string = optarg; | |
640 | /* only makes sense with inetd_flag, i.e. no listen() */ | |
641 | inetd_flag = 1; | |
642 | break; | |
f87f09aa | 643 | case 't': |
644 | test_flag = 1; | |
645 | break; | |
c345cf9d | 646 | case 'u': |
647 | utmp_len = atoi(optarg); | |
648 | break; | |
5260325f | 649 | case '?': |
650 | default: | |
651 | fprintf(stderr, "sshd version %s\n", SSH_VERSION); | |
1fe6a48f | 652 | fprintf(stderr, "Usage: %s [options]\n", __progname); |
5260325f | 653 | fprintf(stderr, "Options:\n"); |
42f11eb2 | 654 | fprintf(stderr, " -f file Configuration file (default %s)\n", _PATH_SERVER_CONFIG_FILE); |
bcbf86ec | 655 | fprintf(stderr, " -d Debugging mode (multiple -d means more debugging)\n"); |
5260325f | 656 | fprintf(stderr, " -i Started from inetd\n"); |
8abcdba4 | 657 | fprintf(stderr, " -D Do not fork into daemon mode\n"); |
f87f09aa | 658 | fprintf(stderr, " -t Only test configuration file and keys\n"); |
5260325f | 659 | fprintf(stderr, " -q Quiet (no logging)\n"); |
660 | fprintf(stderr, " -p port Listen on the specified port (default: 22)\n"); | |
661 | fprintf(stderr, " -k seconds Regenerate server key every this many seconds (default: 3600)\n"); | |
9616313f | 662 | fprintf(stderr, " -g seconds Grace period for authentication (default: 600)\n"); |
5260325f | 663 | fprintf(stderr, " -b bits Size of server RSA key (default: 768 bits)\n"); |
664 | fprintf(stderr, " -h file File from which to read host key (default: %s)\n", | |
42f11eb2 | 665 | _PATH_HOST_KEY_FILE); |
c345cf9d | 666 | fprintf(stderr, " -u len Maximum hostname length for utmp recording\n"); |
48e671d5 | 667 | fprintf(stderr, " -4 Use IPv4 only\n"); |
668 | fprintf(stderr, " -6 Use IPv6 only\n"); | |
5260325f | 669 | exit(1); |
670 | } | |
671 | } | |
1a92bd7e | 672 | SSLeay_add_all_algorithms(); |
5e4a7219 | 673 | channel_set_af(IPv4or6); |
5260325f | 674 | |
48e671d5 | 675 | /* |
676 | * Force logging to stderr until we have loaded the private host | |
677 | * key (unless started from inetd) | |
678 | */ | |
1fe6a48f | 679 | log_init(__progname, |
59c97189 | 680 | options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
48e671d5 | 681 | options.log_facility == -1 ? SYSLOG_FACILITY_AUTH : options.log_facility, |
9bd5b720 | 682 | !inetd_flag); |
48e671d5 | 683 | |
1a23ac2c | 684 | #ifdef _CRAY |
685 | /* Cray can define user privs drop all prives now! | |
686 | * Not needed on PRIV_SU systems! | |
687 | */ | |
688 | drop_cray_privs(); | |
689 | #endif | |
690 | ||
e339aa53 | 691 | seed_rng(); |
692 | ||
5260325f | 693 | /* Read server configuration options from the configuration file. */ |
694 | read_server_config(&options, config_file_name); | |
695 | ||
696 | /* Fill in default values for those options not explicitly set. */ | |
697 | fill_default_server_options(&options); | |
698 | ||
5260325f | 699 | /* Check that there are no remaining arguments. */ |
700 | if (optind < ac) { | |
701 | fprintf(stderr, "Extra argument %s.\n", av[optind]); | |
702 | exit(1); | |
8efc0c15 | 703 | } |
5260325f | 704 | |
705 | debug("sshd version %.100s", SSH_VERSION); | |
706 | ||
fa08c86b | 707 | /* load private host keys */ |
708 | sensitive_data.host_keys = xmalloc(options.num_host_key_files*sizeof(Key*)); | |
1e3b8b07 | 709 | for(i = 0; i < options.num_host_key_files; i++) |
710 | sensitive_data.host_keys[i] = NULL; | |
fa08c86b | 711 | sensitive_data.server_key = NULL; |
712 | sensitive_data.ssh1_host_key = NULL; | |
713 | sensitive_data.have_ssh1_key = 0; | |
714 | sensitive_data.have_ssh2_key = 0; | |
a306f2dd | 715 | |
fa08c86b | 716 | for(i = 0; i < options.num_host_key_files; i++) { |
aeaa3d9e | 717 | key = key_load_private(options.host_key_files[i], "", NULL); |
718 | sensitive_data.host_keys[i] = key; | |
fa08c86b | 719 | if (key == NULL) { |
58cfa257 | 720 | error("Could not load host key: %s", |
721 | options.host_key_files[i]); | |
aeaa3d9e | 722 | sensitive_data.host_keys[i] = NULL; |
fa08c86b | 723 | continue; |
a306f2dd | 724 | } |
fa08c86b | 725 | switch(key->type){ |
726 | case KEY_RSA1: | |
727 | sensitive_data.ssh1_host_key = key; | |
728 | sensitive_data.have_ssh1_key = 1; | |
729 | break; | |
730 | case KEY_RSA: | |
731 | case KEY_DSA: | |
732 | sensitive_data.have_ssh2_key = 1; | |
733 | break; | |
a306f2dd | 734 | } |
aeaa3d9e | 735 | debug("private host key: #%d type %d %s", i, key->type, |
736 | key_type(key)); | |
fa08c86b | 737 | } |
738 | if ((options.protocol & SSH_PROTO_1) && !sensitive_data.have_ssh1_key) { | |
739 | log("Disabling protocol version 1. Could not load host key"); | |
740 | options.protocol &= ~SSH_PROTO_1; | |
741 | } | |
742 | if ((options.protocol & SSH_PROTO_2) && !sensitive_data.have_ssh2_key) { | |
743 | log("Disabling protocol version 2. Could not load host key"); | |
744 | options.protocol &= ~SSH_PROTO_2; | |
a306f2dd | 745 | } |
6a416424 | 746 | if (!(options.protocol & (SSH_PROTO_1|SSH_PROTO_2))) { |
54b974dc | 747 | log("sshd: no hostkeys available -- exiting."); |
5260325f | 748 | exit(1); |
749 | } | |
5260325f | 750 | |
a306f2dd | 751 | /* Check certain values for sanity. */ |
752 | if (options.protocol & SSH_PROTO_1) { | |
753 | if (options.server_key_bits < 512 || | |
754 | options.server_key_bits > 32768) { | |
755 | fprintf(stderr, "Bad server key size.\n"); | |
756 | exit(1); | |
757 | } | |
758 | /* | |
759 | * Check that server and host key lengths differ sufficiently. This | |
760 | * is necessary to make double encryption work with rsaref. Oh, I | |
761 | * hate software patents. I dont know if this can go? Niels | |
762 | */ | |
763 | if (options.server_key_bits > | |
fa08c86b | 764 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) - SSH_KEY_BITS_RESERVED && |
a306f2dd | 765 | options.server_key_bits < |
fa08c86b | 766 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + SSH_KEY_BITS_RESERVED) { |
a306f2dd | 767 | options.server_key_bits = |
fa08c86b | 768 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + SSH_KEY_BITS_RESERVED; |
a306f2dd | 769 | debug("Forcing server key to %d bits to make it differ from host key.", |
770 | options.server_key_bits); | |
771 | } | |
772 | } | |
773 | ||
f87f09aa | 774 | /* Configuration looks good, so exit if in test mode. */ |
775 | if (test_flag) | |
776 | exit(0); | |
777 | ||
77bb0bca | 778 | #ifdef HAVE_SCO_PROTECTED_PW |
779 | (void) set_auth_parameters(ac, av); | |
780 | #endif | |
781 | ||
a306f2dd | 782 | /* Initialize the log (it is reinitialized below in case we forked). */ |
5260325f | 783 | if (debug_flag && !inetd_flag) |
784 | log_stderr = 1; | |
1fe6a48f | 785 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
5260325f | 786 | |
a306f2dd | 787 | /* |
788 | * If not in debugging mode, and not started from inetd, disconnect | |
789 | * from the controlling terminal, and fork. The original process | |
790 | * exits. | |
791 | */ | |
0b6fbf03 | 792 | if (!(debug_flag || inetd_flag || no_daemon_flag)) { |
8efc0c15 | 793 | #ifdef TIOCNOTTY |
5260325f | 794 | int fd; |
8efc0c15 | 795 | #endif /* TIOCNOTTY */ |
5260325f | 796 | if (daemon(0, 0) < 0) |
797 | fatal("daemon() failed: %.200s", strerror(errno)); | |
798 | ||
799 | /* Disconnect from the controlling tty. */ | |
8efc0c15 | 800 | #ifdef TIOCNOTTY |
5ca51e19 | 801 | fd = open(_PATH_TTY, O_RDWR | O_NOCTTY); |
5260325f | 802 | if (fd >= 0) { |
803 | (void) ioctl(fd, TIOCNOTTY, NULL); | |
804 | close(fd); | |
805 | } | |
8efc0c15 | 806 | #endif /* TIOCNOTTY */ |
8efc0c15 | 807 | } |
5260325f | 808 | /* Reinitialize the log (because of the fork above). */ |
1fe6a48f | 809 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
5260325f | 810 | |
5260325f | 811 | /* Initialize the random number generator. */ |
812 | arc4random_stir(); | |
813 | ||
814 | /* Chdir to the root directory so that the current disk can be | |
815 | unmounted if desired. */ | |
816 | chdir("/"); | |
1d3c30db | 817 | |
818 | /* ignore SIGPIPE */ | |
819 | signal(SIGPIPE, SIG_IGN); | |
5260325f | 820 | |
5260325f | 821 | /* Start listening for a socket, unless started from inetd. */ |
822 | if (inetd_flag) { | |
ec1f12d3 | 823 | int s1; |
5260325f | 824 | s1 = dup(0); /* Make sure descriptors 0, 1, and 2 are in use. */ |
ec1f12d3 | 825 | dup(s1); |
5260325f | 826 | sock_in = dup(0); |
827 | sock_out = dup(1); | |
4c8722d9 | 828 | startup_pipe = -1; |
a306f2dd | 829 | /* |
830 | * We intentionally do not close the descriptors 0, 1, and 2 | |
831 | * as our code for setting the descriptors won\'t work if | |
832 | * ttyfd happens to be one of those. | |
833 | */ | |
5260325f | 834 | debug("inetd sockets after dupping: %d, %d", sock_in, sock_out); |
fa08c86b | 835 | if (options.protocol & SSH_PROTO_1) |
cb7bd922 | 836 | generate_ephemeral_server_key(); |
5260325f | 837 | } else { |
48e671d5 | 838 | for (ai = options.listen_addrs; ai; ai = ai->ai_next) { |
839 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
840 | continue; | |
841 | if (num_listen_socks >= MAX_LISTEN_SOCKS) | |
842 | fatal("Too many listen sockets. " | |
843 | "Enlarge MAX_LISTEN_SOCKS"); | |
844 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, | |
845 | ntop, sizeof(ntop), strport, sizeof(strport), | |
846 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
847 | error("getnameinfo failed"); | |
848 | continue; | |
849 | } | |
850 | /* Create socket for listening. */ | |
851 | listen_sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
852 | if (listen_sock < 0) { | |
853 | /* kernel may not support ipv6 */ | |
854 | verbose("socket: %.100s", strerror(errno)); | |
855 | continue; | |
856 | } | |
857 | if (fcntl(listen_sock, F_SETFL, O_NONBLOCK) < 0) { | |
858 | error("listen_sock O_NONBLOCK: %s", strerror(errno)); | |
859 | close(listen_sock); | |
860 | continue; | |
861 | } | |
862 | /* | |
863 | * Set socket options. We try to make the port | |
864 | * reusable and have it close as fast as possible | |
865 | * without waiting in unnecessary wait states on | |
866 | * close. | |
867 | */ | |
868 | setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, | |
869 | (void *) &on, sizeof(on)); | |
870 | linger.l_onoff = 1; | |
871 | linger.l_linger = 5; | |
872 | setsockopt(listen_sock, SOL_SOCKET, SO_LINGER, | |
873 | (void *) &linger, sizeof(linger)); | |
874 | ||
875 | debug("Bind to port %s on %s.", strport, ntop); | |
876 | ||
877 | /* Bind the socket to the desired port. */ | |
32ced054 | 878 | if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
879 | if (!ai->ai_next) | |
880 | error("Bind to port %s on %s failed: %.200s.", | |
881 | strport, ntop, strerror(errno)); | |
48e671d5 | 882 | close(listen_sock); |
883 | continue; | |
884 | } | |
885 | listen_socks[num_listen_socks] = listen_sock; | |
886 | num_listen_socks++; | |
887 | ||
888 | /* Start listening on the port. */ | |
889 | log("Server listening on %s port %s.", ntop, strport); | |
890 | if (listen(listen_sock, 5) < 0) | |
891 | fatal("listen: %.100s", strerror(errno)); | |
892 | ||
5260325f | 893 | } |
48e671d5 | 894 | freeaddrinfo(options.listen_addrs); |
895 | ||
896 | if (!num_listen_socks) | |
897 | fatal("Cannot bind any address."); | |
898 | ||
3aca00a3 | 899 | if (options.protocol & SSH_PROTO_1) |
900 | generate_ephemeral_server_key(); | |
901 | ||
902 | /* | |
903 | * Arrange to restart on SIGHUP. The handler needs | |
904 | * listen_sock. | |
905 | */ | |
906 | signal(SIGHUP, sighup_handler); | |
907 | ||
908 | signal(SIGTERM, sigterm_handler); | |
909 | signal(SIGQUIT, sigterm_handler); | |
910 | ||
911 | /* Arrange SIGCHLD to be caught. */ | |
912 | signal(SIGCHLD, main_sigchld_handler); | |
913 | ||
914 | /* Write out the pid file after the sigterm handler is setup */ | |
5260325f | 915 | if (!debug_flag) { |
aa3378df | 916 | /* |
97fb6912 | 917 | * Record our pid in /var/run/sshd.pid to make it |
918 | * easier to kill the correct sshd. We don't want to | |
919 | * do this before the bind above because the bind will | |
aa3378df | 920 | * fail if there already is a daemon, and this will |
921 | * overwrite any old pid in the file. | |
922 | */ | |
3c62e7eb | 923 | f = fopen(options.pid_file, "wb"); |
5260325f | 924 | if (f) { |
1e3b8b07 | 925 | fprintf(f, "%u\n", (u_int) getpid()); |
5260325f | 926 | fclose(f); |
927 | } | |
8efc0c15 | 928 | } |
5260325f | 929 | |
48e671d5 | 930 | /* setup fd set for listen */ |
089fbbd2 | 931 | fdset = NULL; |
48e671d5 | 932 | maxfd = 0; |
933 | for (i = 0; i < num_listen_socks; i++) | |
934 | if (listen_socks[i] > maxfd) | |
935 | maxfd = listen_socks[i]; | |
089fbbd2 | 936 | /* pipes connected to unauthenticated childs */ |
937 | startup_pipes = xmalloc(options.max_startups * sizeof(int)); | |
938 | for (i = 0; i < options.max_startups; i++) | |
939 | startup_pipes[i] = -1; | |
48e671d5 | 940 | |
aa3378df | 941 | /* |
942 | * Stay listening for connections until the system crashes or | |
943 | * the daemon is killed with a signal. | |
944 | */ | |
5260325f | 945 | for (;;) { |
946 | if (received_sighup) | |
947 | sighup_restart(); | |
089fbbd2 | 948 | if (fdset != NULL) |
949 | xfree(fdset); | |
b5c334cc | 950 | fdsetsz = howmany(maxfd+1, NFDBITS) * sizeof(fd_mask); |
089fbbd2 | 951 | fdset = (fd_set *)xmalloc(fdsetsz); |
48e671d5 | 952 | memset(fdset, 0, fdsetsz); |
089fbbd2 | 953 | |
48e671d5 | 954 | for (i = 0; i < num_listen_socks; i++) |
955 | FD_SET(listen_socks[i], fdset); | |
089fbbd2 | 956 | for (i = 0; i < options.max_startups; i++) |
957 | if (startup_pipes[i] != -1) | |
958 | FD_SET(startup_pipes[i], fdset); | |
959 | ||
960 | /* Wait in select until there is a connection. */ | |
59c97189 | 961 | ret = select(maxfd+1, fdset, NULL, NULL, NULL); |
962 | if (ret < 0 && errno != EINTR) | |
963 | error("select: %.100s", strerror(errno)); | |
c9130033 | 964 | if (received_sigterm) { |
965 | log("Received signal %d; terminating.", | |
966 | received_sigterm); | |
967 | close_listen_socks(); | |
968 | unlink(options.pid_file); | |
969 | exit(255); | |
970 | } | |
59c97189 | 971 | if (key_used && key_do_regen) { |
cb7bd922 | 972 | generate_ephemeral_server_key(); |
59c97189 | 973 | key_used = 0; |
974 | key_do_regen = 0; | |
48e671d5 | 975 | } |
59c97189 | 976 | if (ret < 0) |
977 | continue; | |
978 | ||
089fbbd2 | 979 | for (i = 0; i < options.max_startups; i++) |
980 | if (startup_pipes[i] != -1 && | |
981 | FD_ISSET(startup_pipes[i], fdset)) { | |
982 | /* | |
983 | * the read end of the pipe is ready | |
984 | * if the child has closed the pipe | |
8abcdba4 | 985 | * after successful authentication |
089fbbd2 | 986 | * or if the child has died |
987 | */ | |
988 | close(startup_pipes[i]); | |
989 | startup_pipes[i] = -1; | |
990 | startups--; | |
991 | } | |
48e671d5 | 992 | for (i = 0; i < num_listen_socks; i++) { |
993 | if (!FD_ISSET(listen_socks[i], fdset)) | |
5260325f | 994 | continue; |
089fbbd2 | 995 | fromlen = sizeof(from); |
996 | newsock = accept(listen_socks[i], (struct sockaddr *)&from, | |
997 | &fromlen); | |
998 | if (newsock < 0) { | |
999 | if (errno != EINTR && errno != EWOULDBLOCK) | |
1000 | error("accept: %.100s", strerror(errno)); | |
1001 | continue; | |
1002 | } | |
1003 | if (fcntl(newsock, F_SETFL, 0) < 0) { | |
1004 | error("newsock del O_NONBLOCK: %s", strerror(errno)); | |
1005 | continue; | |
1006 | } | |
c345cf9d | 1007 | if (drop_connection(startups) == 1) { |
1008 | debug("drop connection #%d", startups); | |
089fbbd2 | 1009 | close(newsock); |
1010 | continue; | |
1011 | } | |
1012 | if (pipe(startup_p) == -1) { | |
1013 | close(newsock); | |
1014 | continue; | |
1015 | } | |
1016 | ||
1017 | for (j = 0; j < options.max_startups; j++) | |
1018 | if (startup_pipes[j] == -1) { | |
1019 | startup_pipes[j] = startup_p[0]; | |
1020 | if (maxfd < startup_p[0]) | |
1021 | maxfd = startup_p[0]; | |
1022 | startups++; | |
1023 | break; | |
1024 | } | |
2b87da3b | 1025 | |
aa3378df | 1026 | /* |
089fbbd2 | 1027 | * Got connection. Fork a child to handle it, unless |
1028 | * we are in debugging mode. | |
aa3378df | 1029 | */ |
089fbbd2 | 1030 | if (debug_flag) { |
aa3378df | 1031 | /* |
089fbbd2 | 1032 | * In debugging mode. Close the listening |
1033 | * socket, and start processing the | |
1034 | * connection without forking. | |
aa3378df | 1035 | */ |
089fbbd2 | 1036 | debug("Server will not fork when running in debugging mode."); |
48e671d5 | 1037 | close_listen_socks(); |
5260325f | 1038 | sock_in = newsock; |
1039 | sock_out = newsock; | |
5540ea9b | 1040 | startup_pipe = -1; |
3f7a7e4a | 1041 | pid = getpid(); |
5260325f | 1042 | break; |
089fbbd2 | 1043 | } else { |
1044 | /* | |
1045 | * Normal production daemon. Fork, and have | |
1046 | * the child process the connection. The | |
1047 | * parent continues listening. | |
1048 | */ | |
1049 | if ((pid = fork()) == 0) { | |
1050 | /* | |
1051 | * Child. Close the listening and max_startup | |
1052 | * sockets. Start using the accepted socket. | |
1053 | * Reinitialize logging (since our pid has | |
1054 | * changed). We break out of the loop to handle | |
1055 | * the connection. | |
1056 | */ | |
1057 | startup_pipe = startup_p[1]; | |
1058 | for (j = 0; j < options.max_startups; j++) | |
1059 | if (startup_pipes[j] != -1) | |
1060 | close(startup_pipes[j]); | |
1061 | close_listen_socks(); | |
1062 | sock_in = newsock; | |
1063 | sock_out = newsock; | |
1fe6a48f | 1064 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
089fbbd2 | 1065 | break; |
1066 | } | |
5260325f | 1067 | } |
5260325f | 1068 | |
089fbbd2 | 1069 | /* Parent. Stay in the loop. */ |
1070 | if (pid < 0) | |
1071 | error("fork: %.100s", strerror(errno)); | |
1072 | else | |
1073 | debug("Forked child %d.", pid); | |
5260325f | 1074 | |
089fbbd2 | 1075 | close(startup_p[1]); |
5260325f | 1076 | |
089fbbd2 | 1077 | /* Mark that the key has been used (it was "given" to the child). */ |
59c97189 | 1078 | if ((options.protocol & SSH_PROTO_1) && |
1079 | key_used == 0) { | |
1080 | /* Schedule server key regeneration alarm. */ | |
1081 | signal(SIGALRM, key_regeneration_alarm); | |
1082 | alarm(options.key_regeneration_time); | |
1083 | key_used = 1; | |
1084 | } | |
5260325f | 1085 | |
089fbbd2 | 1086 | arc4random_stir(); |
1087 | ||
1088 | /* Close the new socket (the child is now taking care of it). */ | |
1089 | close(newsock); | |
1090 | } | |
48e671d5 | 1091 | /* child process check (or debug mode) */ |
1092 | if (num_listen_socks < 0) | |
1093 | break; | |
5260325f | 1094 | } |
1095 | } | |
8efc0c15 | 1096 | |
5260325f | 1097 | /* This is the child processing a new connection. */ |
1098 | ||
aa3378df | 1099 | /* |
1100 | * Disable the key regeneration alarm. We will not regenerate the | |
1101 | * key since we are no longer in a position to give it to anyone. We | |
1102 | * will not restart on SIGHUP since it no longer makes sense. | |
1103 | */ | |
5260325f | 1104 | alarm(0); |
1105 | signal(SIGALRM, SIG_DFL); | |
1106 | signal(SIGHUP, SIG_DFL); | |
1107 | signal(SIGTERM, SIG_DFL); | |
1108 | signal(SIGQUIT, SIG_DFL); | |
1109 | signal(SIGCHLD, SIG_DFL); | |
9aaf9be4 | 1110 | signal(SIGINT, SIG_DFL); |
5260325f | 1111 | |
aa3378df | 1112 | /* |
1113 | * Set socket options for the connection. We want the socket to | |
1114 | * close as fast as possible without waiting for anything. If the | |
1115 | * connection is not a socket, these will do nothing. | |
1116 | */ | |
1117 | /* setsockopt(sock_in, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); */ | |
5260325f | 1118 | linger.l_onoff = 1; |
1119 | linger.l_linger = 5; | |
1120 | setsockopt(sock_in, SOL_SOCKET, SO_LINGER, (void *) &linger, sizeof(linger)); | |
1121 | ||
b5c334cc | 1122 | /* Set keepalives if requested. */ |
1123 | if (options.keepalives && | |
1124 | setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, | |
1125 | sizeof(on)) < 0) | |
1126 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); | |
1127 | ||
aa3378df | 1128 | /* |
1129 | * Register our connection. This turns encryption off because we do | |
1130 | * not have a key. | |
1131 | */ | |
5260325f | 1132 | packet_set_connection(sock_in, sock_out); |
1133 | ||
1134 | remote_port = get_remote_port(); | |
1135 | remote_ip = get_remote_ipaddr(); | |
1136 | ||
1137 | /* Check whether logins are denied from this host. */ | |
1138 | #ifdef LIBWRAP | |
48e671d5 | 1139 | /* XXX LIBWRAP noes not know about IPv6 */ |
5260325f | 1140 | { |
1141 | struct request_info req; | |
8efc0c15 | 1142 | |
8fbc356d | 1143 | request_init(&req, RQ_DAEMON, __progname, RQ_FILE, sock_in, 0); |
5260325f | 1144 | fromhost(&req); |
8efc0c15 | 1145 | |
5260325f | 1146 | if (!hosts_access(&req)) { |
563834bb | 1147 | refuse(&req); |
5260325f | 1148 | close(sock_in); |
1149 | close(sock_out); | |
5260325f | 1150 | } |
48e671d5 | 1151 | /*XXX IPv6 verbose("Connection from %.500s port %d", eval_client(&req), remote_port); */ |
8efc0c15 | 1152 | } |
48e671d5 | 1153 | #endif /* LIBWRAP */ |
5260325f | 1154 | /* Log the connection. */ |
1155 | verbose("Connection from %.500s port %d", remote_ip, remote_port); | |
8efc0c15 | 1156 | |
aa3378df | 1157 | /* |
1158 | * We don\'t want to listen forever unless the other side | |
1159 | * successfully authenticates itself. So we set up an alarm which is | |
1160 | * cleared after successful authentication. A limit of zero | |
1161 | * indicates no limit. Note that we don\'t set the alarm in debugging | |
1162 | * mode; it is just annoying to have the server exit just when you | |
1163 | * are about to discover the bug. | |
1164 | */ | |
5260325f | 1165 | signal(SIGALRM, grace_alarm_handler); |
1166 | if (!debug_flag) | |
1167 | alarm(options.login_grace_time); | |
1168 | ||
7368a6c8 | 1169 | sshd_exchange_identification(sock_in, sock_out); |
aa3378df | 1170 | /* |
6ffc9c88 | 1171 | * Check that the connection comes from a privileged port. |
1172 | * Rhosts-Authentication only makes sense from priviledged | |
aa3378df | 1173 | * programs. Of course, if the intruder has root access on his local |
1174 | * machine, he can connect from any port. So do not use these | |
1175 | * authentication methods from machines that you do not trust. | |
1176 | */ | |
5260325f | 1177 | if (remote_port >= IPPORT_RESERVED || |
1178 | remote_port < IPPORT_RESERVED / 2) { | |
6ffc9c88 | 1179 | debug("Rhosts Authentication disabled, " |
9ae3f727 | 1180 | "originating port %d not trusted.", remote_port); |
5260325f | 1181 | options.rhosts_authentication = 0; |
5260325f | 1182 | } |
ced49be2 | 1183 | #if defined(KRB4) && !defined(KRB5) |
48e671d5 | 1184 | if (!packet_connection_is_ipv4() && |
1185 | options.kerberos_authentication) { | |
1186 | debug("Kerberos Authentication disabled, only available for IPv4."); | |
1187 | options.kerberos_authentication = 0; | |
1188 | } | |
ced49be2 | 1189 | #endif /* KRB4 && !KRB5 */ |
abf1f107 | 1190 | #ifdef AFS |
1191 | /* If machine has AFS, set process authentication group. */ | |
1192 | if (k_hasafs()) { | |
1193 | k_setpag(); | |
1194 | k_unlog(); | |
1195 | } | |
1196 | #endif /* AFS */ | |
48e671d5 | 1197 | |
5260325f | 1198 | packet_set_nonblocking(); |
1199 | ||
7b2ea3a1 | 1200 | /* perform the key exchange */ |
7b2ea3a1 | 1201 | /* authenticate user and start session */ |
e78a59f5 | 1202 | if (compat20) { |
1203 | do_ssh2_kex(); | |
1204 | do_authentication2(); | |
1205 | } else { | |
1206 | do_ssh1_kex(); | |
1207 | do_authentication(); | |
1208 | } | |
5260325f | 1209 | /* The connection has been terminated. */ |
1210 | verbose("Closing connection to %.100s", remote_ip); | |
8efc0c15 | 1211 | |
d94aa2ae | 1212 | #ifdef USE_PAM |
a5c9cd31 | 1213 | finish_pam(); |
d94aa2ae | 1214 | #endif /* USE_PAM */ |
8efc0c15 | 1215 | |
5260325f | 1216 | packet_close(); |
1217 | exit(0); | |
1218 | } | |
8efc0c15 | 1219 | |
5260325f | 1220 | /* |
7b2ea3a1 | 1221 | * SSH1 key exchange |
5260325f | 1222 | */ |
396c147e | 1223 | static void |
1e3b8b07 | 1224 | do_ssh1_kex(void) |
8efc0c15 | 1225 | { |
5260325f | 1226 | int i, len; |
7b2ea3a1 | 1227 | int plen, slen; |
46aa2d1f | 1228 | int rsafail = 0; |
5260325f | 1229 | BIGNUM *session_key_int; |
1e3b8b07 | 1230 | u_char session_key[SSH_SESSION_KEY_LENGTH]; |
1231 | u_char cookie[8]; | |
1232 | u_int cipher_type, auth_mask, protocol_flags; | |
5260325f | 1233 | u_int32_t rand = 0; |
1234 | ||
aa3378df | 1235 | /* |
1236 | * Generate check bytes that the client must send back in the user | |
1237 | * packet in order for it to be accepted; this is used to defy ip | |
1238 | * spoofing attacks. Note that this only works against somebody | |
1239 | * doing IP spoofing from a remote machine; any machine on the local | |
1240 | * network can still see outgoing packets and catch the random | |
1241 | * cookie. This only affects rhosts authentication, and this is one | |
1242 | * of the reasons why it is inherently insecure. | |
1243 | */ | |
5260325f | 1244 | for (i = 0; i < 8; i++) { |
1245 | if (i % 4 == 0) | |
1246 | rand = arc4random(); | |
7b2ea3a1 | 1247 | cookie[i] = rand & 0xff; |
5260325f | 1248 | rand >>= 8; |
1249 | } | |
1250 | ||
aa3378df | 1251 | /* |
1252 | * Send our public key. We include in the packet 64 bits of random | |
1253 | * data that must be matched in the reply in order to prevent IP | |
1254 | * spoofing. | |
1255 | */ | |
5260325f | 1256 | packet_start(SSH_SMSG_PUBLIC_KEY); |
1257 | for (i = 0; i < 8; i++) | |
7b2ea3a1 | 1258 | packet_put_char(cookie[i]); |
5260325f | 1259 | |
1260 | /* Store our public server RSA key. */ | |
fa08c86b | 1261 | packet_put_int(BN_num_bits(sensitive_data.server_key->rsa->n)); |
1262 | packet_put_bignum(sensitive_data.server_key->rsa->e); | |
1263 | packet_put_bignum(sensitive_data.server_key->rsa->n); | |
5260325f | 1264 | |
1265 | /* Store our public host RSA key. */ | |
fa08c86b | 1266 | packet_put_int(BN_num_bits(sensitive_data.ssh1_host_key->rsa->n)); |
1267 | packet_put_bignum(sensitive_data.ssh1_host_key->rsa->e); | |
1268 | packet_put_bignum(sensitive_data.ssh1_host_key->rsa->n); | |
5260325f | 1269 | |
1270 | /* Put protocol flags. */ | |
1271 | packet_put_int(SSH_PROTOFLAG_HOST_IN_FWD_OPEN); | |
1272 | ||
1273 | /* Declare which ciphers we support. */ | |
94ec8c6b | 1274 | packet_put_int(cipher_mask_ssh1(0)); |
5260325f | 1275 | |
1276 | /* Declare supported authentication types. */ | |
1277 | auth_mask = 0; | |
1278 | if (options.rhosts_authentication) | |
1279 | auth_mask |= 1 << SSH_AUTH_RHOSTS; | |
1280 | if (options.rhosts_rsa_authentication) | |
1281 | auth_mask |= 1 << SSH_AUTH_RHOSTS_RSA; | |
1282 | if (options.rsa_authentication) | |
1283 | auth_mask |= 1 << SSH_AUTH_RSA; | |
ced49be2 | 1284 | #if defined(KRB4) || defined(KRB5) |
5260325f | 1285 | if (options.kerberos_authentication) |
1286 | auth_mask |= 1 << SSH_AUTH_KERBEROS; | |
8efc0c15 | 1287 | #endif |
ced49be2 | 1288 | #if defined(AFS) || defined(KRB5) |
5260325f | 1289 | if (options.kerberos_tgt_passing) |
1290 | auth_mask |= 1 << SSH_PASS_KERBEROS_TGT; | |
ced49be2 | 1291 | #endif |
1292 | #ifdef AFS | |
5260325f | 1293 | if (options.afs_token_passing) |
1294 | auth_mask |= 1 << SSH_PASS_AFS_TOKEN; | |
8efc0c15 | 1295 | #endif |
5ba55ada | 1296 | if (options.challenge_response_authentication == 1) |
5260325f | 1297 | auth_mask |= 1 << SSH_AUTH_TIS; |
5260325f | 1298 | if (options.password_authentication) |
1299 | auth_mask |= 1 << SSH_AUTH_PASSWORD; | |
1300 | packet_put_int(auth_mask); | |
1301 | ||
1302 | /* Send the packet and wait for it to be sent. */ | |
1303 | packet_send(); | |
1304 | packet_write_wait(); | |
1305 | ||
fa08c86b | 1306 | debug("Sent %d bit server key and %d bit host key.", |
1307 | BN_num_bits(sensitive_data.server_key->rsa->n), | |
1308 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n)); | |
5260325f | 1309 | |
1310 | /* Read clients reply (cipher type and session key). */ | |
1311 | packet_read_expect(&plen, SSH_CMSG_SESSION_KEY); | |
1312 | ||
2d86a6cc | 1313 | /* Get cipher type and check whether we accept this. */ |
5260325f | 1314 | cipher_type = packet_get_char(); |
1315 | ||
94ec8c6b | 1316 | if (!(cipher_mask_ssh1(0) & (1 << cipher_type))) |
2d86a6cc | 1317 | packet_disconnect("Warning: client selects unsupported cipher."); |
1318 | ||
5260325f | 1319 | /* Get check bytes from the packet. These must match those we |
1320 | sent earlier with the public key packet. */ | |
1321 | for (i = 0; i < 8; i++) | |
7b2ea3a1 | 1322 | if (cookie[i] != packet_get_char()) |
5260325f | 1323 | packet_disconnect("IP Spoofing check bytes do not match."); |
1324 | ||
1325 | debug("Encryption type: %.200s", cipher_name(cipher_type)); | |
1326 | ||
1327 | /* Get the encrypted integer. */ | |
1328 | session_key_int = BN_new(); | |
1329 | packet_get_bignum(session_key_int, &slen); | |
1330 | ||
5260325f | 1331 | protocol_flags = packet_get_int(); |
1332 | packet_set_protocol_flags(protocol_flags); | |
1333 | ||
1334 | packet_integrity_check(plen, 1 + 8 + slen + 4, SSH_CMSG_SESSION_KEY); | |
1335 | ||
aa3378df | 1336 | /* |
1337 | * Decrypt it using our private server key and private host key (key | |
1338 | * with larger modulus first). | |
1339 | */ | |
fa08c86b | 1340 | if (BN_cmp(sensitive_data.server_key->rsa->n, sensitive_data.ssh1_host_key->rsa->n) > 0) { |
46aa2d1f | 1341 | /* Server key has bigger modulus. */ |
fa08c86b | 1342 | if (BN_num_bits(sensitive_data.server_key->rsa->n) < |
1343 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + SSH_KEY_BITS_RESERVED) { | |
1344 | fatal("do_connection: %s: server_key %d < host_key %d + SSH_KEY_BITS_RESERVED %d", | |
1345 | get_remote_ipaddr(), | |
1346 | BN_num_bits(sensitive_data.server_key->rsa->n), | |
1347 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n), | |
1348 | SSH_KEY_BITS_RESERVED); | |
5260325f | 1349 | } |
46aa2d1f | 1350 | if (rsa_private_decrypt(session_key_int, session_key_int, |
1351 | sensitive_data.server_key->rsa) <= 0) | |
1352 | rsafail++; | |
1353 | if (rsa_private_decrypt(session_key_int, session_key_int, | |
1354 | sensitive_data.ssh1_host_key->rsa) <= 0) | |
1355 | rsafail++; | |
5260325f | 1356 | } else { |
1357 | /* Host key has bigger modulus (or they are equal). */ | |
fa08c86b | 1358 | if (BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) < |
1359 | BN_num_bits(sensitive_data.server_key->rsa->n) + SSH_KEY_BITS_RESERVED) { | |
1360 | fatal("do_connection: %s: host_key %d < server_key %d + SSH_KEY_BITS_RESERVED %d", | |
1361 | get_remote_ipaddr(), | |
1362 | BN_num_bits(sensitive_data.ssh1_host_key->rsa->n), | |
1363 | BN_num_bits(sensitive_data.server_key->rsa->n), | |
1364 | SSH_KEY_BITS_RESERVED); | |
5260325f | 1365 | } |
46aa2d1f | 1366 | if (rsa_private_decrypt(session_key_int, session_key_int, |
1367 | sensitive_data.ssh1_host_key->rsa) < 0) | |
1368 | rsafail++; | |
1369 | if (rsa_private_decrypt(session_key_int, session_key_int, | |
1370 | sensitive_data.server_key->rsa) < 0) | |
1371 | rsafail++; | |
5260325f | 1372 | } |
aa3378df | 1373 | /* |
1374 | * Extract session key from the decrypted integer. The key is in the | |
1375 | * least significant 256 bits of the integer; the first byte of the | |
1376 | * key is in the highest bits. | |
1377 | */ | |
46aa2d1f | 1378 | if (!rsafail) { |
1379 | BN_mask_bits(session_key_int, sizeof(session_key) * 8); | |
1380 | len = BN_num_bytes(session_key_int); | |
1381 | if (len < 0 || len > sizeof(session_key)) { | |
1382 | error("do_connection: bad session key len from %s: " | |
5ca51e19 | 1383 | "session_key_int %d > sizeof(session_key) %lu", |
1384 | get_remote_ipaddr(), len, (u_long)sizeof(session_key)); | |
46aa2d1f | 1385 | rsafail++; |
1386 | } else { | |
1387 | memset(session_key, 0, sizeof(session_key)); | |
1388 | BN_bn2bin(session_key_int, | |
1389 | session_key + sizeof(session_key) - len); | |
00be5382 | 1390 | |
1391 | compute_session_id(session_id, cookie, | |
1392 | sensitive_data.ssh1_host_key->rsa->n, | |
1393 | sensitive_data.server_key->rsa->n); | |
1394 | /* | |
1395 | * Xor the first 16 bytes of the session key with the | |
1396 | * session id. | |
1397 | */ | |
1398 | for (i = 0; i < 16; i++) | |
1399 | session_key[i] ^= session_id[i]; | |
46aa2d1f | 1400 | } |
1401 | } | |
1402 | if (rsafail) { | |
00be5382 | 1403 | int bytes = BN_num_bytes(session_key_int); |
1404 | char *buf = xmalloc(bytes); | |
1405 | MD5_CTX md; | |
1406 | ||
46aa2d1f | 1407 | log("do_connection: generating a fake encryption key"); |
00be5382 | 1408 | BN_bn2bin(session_key_int, buf); |
1409 | MD5_Init(&md); | |
1410 | MD5_Update(&md, buf, bytes); | |
1411 | MD5_Update(&md, sensitive_data.ssh1_cookie, SSH_SESSION_KEY_LENGTH); | |
1412 | MD5_Final(session_key, &md); | |
1413 | MD5_Init(&md); | |
1414 | MD5_Update(&md, session_key, 16); | |
1415 | MD5_Update(&md, buf, bytes); | |
1416 | MD5_Update(&md, sensitive_data.ssh1_cookie, SSH_SESSION_KEY_LENGTH); | |
1417 | MD5_Final(session_key + 16, &md); | |
1418 | memset(buf, 0, bytes); | |
1419 | xfree(buf); | |
0572fe75 | 1420 | for (i = 0; i < 16; i++) |
1421 | session_id[i] = session_key[i] ^ session_key[i + 16]; | |
46aa2d1f | 1422 | } |
00be5382 | 1423 | /* Destroy the private and public keys. They will no longer be needed. */ |
1424 | destroy_sensitive_data(); | |
1425 | ||
7b2ea3a1 | 1426 | /* Destroy the decrypted integer. It is no longer needed. */ |
1427 | BN_clear_free(session_key_int); | |
1428 | ||
5260325f | 1429 | /* Set the session key. From this on all communications will be encrypted. */ |
1430 | packet_set_encryption_key(session_key, SSH_SESSION_KEY_LENGTH, cipher_type); | |
1431 | ||
1432 | /* Destroy our copy of the session key. It is no longer needed. */ | |
1433 | memset(session_key, 0, sizeof(session_key)); | |
1434 | ||
1435 | debug("Received session key; encryption turned on."); | |
1436 | ||
1437 | /* Send an acknowledgement packet. Note that this packet is sent encrypted. */ | |
1438 | packet_start(SSH_SMSG_SUCCESS); | |
1439 | packet_send(); | |
1440 | packet_write_wait(); | |
5260325f | 1441 | } |
e78a59f5 | 1442 | |
1443 | /* | |
1444 | * SSH2 key exchange: diffie-hellman-group1-sha1 | |
1445 | */ | |
396c147e | 1446 | static void |
1e3b8b07 | 1447 | do_ssh2_kex(void) |
e78a59f5 | 1448 | { |
e78a59f5 | 1449 | Kex *kex; |
e78a59f5 | 1450 | |
a8be9f80 | 1451 | if (options.ciphers != NULL) { |
6ae2364d | 1452 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
a8be9f80 | 1453 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; |
1454 | } | |
1ad64a93 | 1455 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
1456 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
1457 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
1458 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
1459 | ||
b2552997 | 1460 | if (options.macs != NULL) { |
1461 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
1462 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
1463 | } | |
fa08c86b | 1464 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = list_hostkey_types(); |
1465 | ||
7a37c112 | 1466 | /* start key exchange */ |
d8ee838b | 1467 | kex = kex_setup(myproposal); |
a5c9ffdb | 1468 | kex->server = 1; |
1469 | kex->client_version_string=client_version_string; | |
1470 | kex->server_version_string=server_version_string; | |
1471 | kex->load_host_key=&get_hostkey_by_type; | |
94ec8c6b | 1472 | |
7a37c112 | 1473 | xxx_kex = kex; |
1474 | ||
c422989b | 1475 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
94ec8c6b | 1476 | |
d1ac6175 | 1477 | session_id2 = kex->session_id; |
1478 | session_id2_len = kex->session_id_len; | |
1479 | ||
94ec8c6b | 1480 | #ifdef DEBUG_KEXDH |
1481 | /* send 1st encrypted/maced/compressed message */ | |
1482 | packet_start(SSH2_MSG_IGNORE); | |
1483 | packet_put_cstring("markus"); | |
1484 | packet_send(); | |
1485 | packet_write_wait(); | |
1486 | #endif | |
a5c9ffdb | 1487 | debug("KEX done"); |
e78a59f5 | 1488 | } |