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36e94dc5 | 1 | /* $OpenBSD: ssh-agent.c,v 1.190 2014/07/25 21:22:03 dtucker Exp $ */ |
16c343f1 PA |
2 | /* |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * The authentication agent program. | |
7 | * | |
8 | * As far as I am concerned, the code I have written for this software | |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
13 | * | |
14 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
15 | * | |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #include "includes.h" | |
38 | ||
39 | #include <sys/types.h> | |
40 | #include <sys/param.h> | |
41 | #include <sys/resource.h> | |
42 | #include <sys/stat.h> | |
43 | #include <sys/socket.h> | |
44 | #ifdef HAVE_SYS_TIME_H | |
45 | # include <sys/time.h> | |
46 | #endif | |
47 | #ifdef HAVE_SYS_UN_H | |
48 | # include <sys/un.h> | |
49 | #endif | |
50 | #include "openbsd-compat/sys-queue.h" | |
51 | ||
36e94dc5 | 52 | #ifdef WITH_OPENSSL |
16c343f1 | 53 | #include <openssl/evp.h> |
16c343f1 | 54 | #include "openbsd-compat/openssl-compat.h" |
36e94dc5 | 55 | #endif |
16c343f1 PA |
56 | |
57 | #include <errno.h> | |
58 | #include <fcntl.h> | |
59 | #ifdef HAVE_PATHS_H | |
60 | # include <paths.h> | |
61 | #endif | |
62 | #include <signal.h> | |
63 | #include <stdarg.h> | |
64 | #include <stdio.h> | |
65 | #include <stdlib.h> | |
66 | #include <time.h> | |
67 | #include <string.h> | |
68 | #include <unistd.h> | |
69 | ||
70 | #include "xmalloc.h" | |
71 | #include "ssh.h" | |
72 | #include "rsa.h" | |
73 | #include "buffer.h" | |
74 | #include "key.h" | |
75 | #include "authfd.h" | |
76 | #include "compat.h" | |
77 | #include "log.h" | |
78 | #include "misc.h" | |
36e94dc5 | 79 | #include "digest.h" |
16c343f1 | 80 | |
856ea928 PA |
81 | #ifdef ENABLE_PKCS11 |
82 | #include "ssh-pkcs11.h" | |
16c343f1 PA |
83 | #endif |
84 | ||
85 | #if defined(HAVE_SYS_PRCTL_H) | |
86 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ | |
87 | #endif | |
88 | ||
89 | typedef enum { | |
90 | AUTH_UNUSED, | |
91 | AUTH_SOCKET, | |
92 | AUTH_CONNECTION | |
93 | } sock_type; | |
94 | ||
95 | typedef struct { | |
96 | int fd; | |
97 | sock_type type; | |
98 | Buffer input; | |
99 | Buffer output; | |
100 | Buffer request; | |
101 | } SocketEntry; | |
102 | ||
103 | u_int sockets_alloc = 0; | |
104 | SocketEntry *sockets = NULL; | |
105 | ||
106 | typedef struct identity { | |
107 | TAILQ_ENTRY(identity) next; | |
108 | Key *key; | |
109 | char *comment; | |
856ea928 | 110 | char *provider; |
36e94dc5 | 111 | time_t death; |
16c343f1 PA |
112 | u_int confirm; |
113 | } Identity; | |
114 | ||
115 | typedef struct { | |
116 | int nentries; | |
117 | TAILQ_HEAD(idqueue, identity) idlist; | |
118 | } Idtab; | |
119 | ||
120 | /* private key table, one per protocol version */ | |
121 | Idtab idtable[3]; | |
122 | ||
123 | int max_fd = 0; | |
124 | ||
125 | /* pid of shell == parent of agent */ | |
126 | pid_t parent_pid = -1; | |
36e94dc5 PA |
127 | time_t parent_alive_interval = 0; |
128 | ||
129 | /* pid of process for which cleanup_socket is applicable */ | |
130 | pid_t cleanup_pid = 0; | |
16c343f1 PA |
131 | |
132 | /* pathname and directory for AUTH_SOCKET */ | |
133 | char socket_name[MAXPATHLEN]; | |
134 | char socket_dir[MAXPATHLEN]; | |
135 | ||
136 | /* locking */ | |
137 | int locked = 0; | |
138 | char *lock_passwd = NULL; | |
139 | ||
140 | extern char *__progname; | |
141 | ||
36e94dc5 PA |
142 | /* Default lifetime in seconds (0 == forever) */ |
143 | static long lifetime = 0; | |
16c343f1 PA |
144 | |
145 | static void | |
146 | close_socket(SocketEntry *e) | |
147 | { | |
148 | close(e->fd); | |
149 | e->fd = -1; | |
150 | e->type = AUTH_UNUSED; | |
151 | buffer_free(&e->input); | |
152 | buffer_free(&e->output); | |
153 | buffer_free(&e->request); | |
154 | } | |
155 | ||
156 | static void | |
157 | idtab_init(void) | |
158 | { | |
159 | int i; | |
160 | ||
161 | for (i = 0; i <=2; i++) { | |
162 | TAILQ_INIT(&idtable[i].idlist); | |
163 | idtable[i].nentries = 0; | |
164 | } | |
165 | } | |
166 | ||
167 | /* return private key table for requested protocol version */ | |
168 | static Idtab * | |
169 | idtab_lookup(int version) | |
170 | { | |
171 | if (version < 1 || version > 2) | |
172 | fatal("internal error, bad protocol version %d", version); | |
173 | return &idtable[version]; | |
174 | } | |
175 | ||
176 | static void | |
177 | free_identity(Identity *id) | |
178 | { | |
179 | key_free(id->key); | |
36e94dc5 PA |
180 | free(id->provider); |
181 | free(id->comment); | |
182 | free(id); | |
16c343f1 PA |
183 | } |
184 | ||
185 | /* return matching private key for given public key */ | |
186 | static Identity * | |
187 | lookup_identity(Key *key, int version) | |
188 | { | |
189 | Identity *id; | |
190 | ||
191 | Idtab *tab = idtab_lookup(version); | |
192 | TAILQ_FOREACH(id, &tab->idlist, next) { | |
193 | if (key_equal(key, id->key)) | |
194 | return (id); | |
195 | } | |
196 | return (NULL); | |
197 | } | |
198 | ||
199 | /* Check confirmation of keysign request */ | |
200 | static int | |
201 | confirm_key(Identity *id) | |
202 | { | |
203 | char *p; | |
204 | int ret = -1; | |
205 | ||
206 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
207 | if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", | |
208 | id->comment, p)) | |
209 | ret = 0; | |
36e94dc5 | 210 | free(p); |
16c343f1 PA |
211 | |
212 | return (ret); | |
213 | } | |
214 | ||
215 | /* send list of supported public keys to 'client' */ | |
216 | static void | |
217 | process_request_identities(SocketEntry *e, int version) | |
218 | { | |
219 | Idtab *tab = idtab_lookup(version); | |
220 | Identity *id; | |
221 | Buffer msg; | |
222 | ||
223 | buffer_init(&msg); | |
224 | buffer_put_char(&msg, (version == 1) ? | |
225 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
226 | buffer_put_int(&msg, tab->nentries); | |
227 | TAILQ_FOREACH(id, &tab->idlist, next) { | |
228 | if (id->key->type == KEY_RSA1) { | |
36e94dc5 | 229 | #ifdef WITH_SSH1 |
16c343f1 PA |
230 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
231 | buffer_put_bignum(&msg, id->key->rsa->e); | |
232 | buffer_put_bignum(&msg, id->key->rsa->n); | |
36e94dc5 | 233 | #endif |
16c343f1 PA |
234 | } else { |
235 | u_char *blob; | |
236 | u_int blen; | |
237 | key_to_blob(id->key, &blob, &blen); | |
238 | buffer_put_string(&msg, blob, blen); | |
36e94dc5 | 239 | free(blob); |
16c343f1 PA |
240 | } |
241 | buffer_put_cstring(&msg, id->comment); | |
242 | } | |
243 | buffer_put_int(&e->output, buffer_len(&msg)); | |
244 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
245 | buffer_free(&msg); | |
246 | } | |
247 | ||
36e94dc5 | 248 | #ifdef WITH_SSH1 |
16c343f1 PA |
249 | /* ssh1 only */ |
250 | static void | |
251 | process_authentication_challenge1(SocketEntry *e) | |
252 | { | |
253 | u_char buf[32], mdbuf[16], session_id[16]; | |
254 | u_int response_type; | |
255 | BIGNUM *challenge; | |
256 | Identity *id; | |
257 | int i, len; | |
258 | Buffer msg; | |
36e94dc5 | 259 | struct ssh_digest_ctx *md; |
16c343f1 PA |
260 | Key *key; |
261 | ||
262 | buffer_init(&msg); | |
263 | key = key_new(KEY_RSA1); | |
264 | if ((challenge = BN_new()) == NULL) | |
265 | fatal("process_authentication_challenge1: BN_new failed"); | |
266 | ||
267 | (void) buffer_get_int(&e->request); /* ignored */ | |
268 | buffer_get_bignum(&e->request, key->rsa->e); | |
269 | buffer_get_bignum(&e->request, key->rsa->n); | |
270 | buffer_get_bignum(&e->request, challenge); | |
271 | ||
272 | /* Only protocol 1.1 is supported */ | |
273 | if (buffer_len(&e->request) == 0) | |
274 | goto failure; | |
275 | buffer_get(&e->request, session_id, 16); | |
276 | response_type = buffer_get_int(&e->request); | |
277 | if (response_type != 1) | |
278 | goto failure; | |
279 | ||
280 | id = lookup_identity(key, 1); | |
281 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { | |
282 | Key *private = id->key; | |
283 | /* Decrypt the challenge using the private key. */ | |
36e94dc5 | 284 | if (rsa_private_decrypt(challenge, challenge, private->rsa) != 0) |
16c343f1 PA |
285 | goto failure; |
286 | ||
287 | /* The response is MD5 of decrypted challenge plus session id. */ | |
288 | len = BN_num_bytes(challenge); | |
289 | if (len <= 0 || len > 32) { | |
290 | logit("process_authentication_challenge: bad challenge length %d", len); | |
291 | goto failure; | |
292 | } | |
293 | memset(buf, 0, 32); | |
294 | BN_bn2bin(challenge, buf + 32 - len); | |
36e94dc5 PA |
295 | if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL || |
296 | ssh_digest_update(md, buf, 32) < 0 || | |
297 | ssh_digest_update(md, session_id, 16) < 0 || | |
298 | ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0) | |
299 | fatal("%s: md5 failed", __func__); | |
300 | ssh_digest_free(md); | |
16c343f1 PA |
301 | |
302 | /* Send the response. */ | |
303 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
304 | for (i = 0; i < 16; i++) | |
305 | buffer_put_char(&msg, mdbuf[i]); | |
306 | goto send; | |
307 | } | |
308 | ||
309 | failure: | |
310 | /* Unknown identity or protocol error. Send failure. */ | |
311 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
312 | send: | |
313 | buffer_put_int(&e->output, buffer_len(&msg)); | |
314 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
315 | key_free(key); | |
316 | BN_clear_free(challenge); | |
317 | buffer_free(&msg); | |
318 | } | |
36e94dc5 | 319 | #endif |
16c343f1 PA |
320 | |
321 | /* ssh2 only */ | |
322 | static void | |
323 | process_sign_request2(SocketEntry *e) | |
324 | { | |
325 | u_char *blob, *data, *signature = NULL; | |
326 | u_int blen, dlen, slen = 0; | |
327 | extern int datafellows; | |
c8c467ee | 328 | int odatafellows; |
16c343f1 PA |
329 | int ok = -1, flags; |
330 | Buffer msg; | |
331 | Key *key; | |
332 | ||
333 | datafellows = 0; | |
334 | ||
335 | blob = buffer_get_string(&e->request, &blen); | |
336 | data = buffer_get_string(&e->request, &dlen); | |
337 | ||
338 | flags = buffer_get_int(&e->request); | |
c8c467ee | 339 | odatafellows = datafellows; |
16c343f1 PA |
340 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
341 | datafellows = SSH_BUG_SIGBLOB; | |
342 | ||
343 | key = key_from_blob(blob, blen); | |
344 | if (key != NULL) { | |
345 | Identity *id = lookup_identity(key, 2); | |
346 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) | |
347 | ok = key_sign(id->key, &signature, &slen, data, dlen); | |
348 | key_free(key); | |
349 | } | |
350 | buffer_init(&msg); | |
351 | if (ok == 0) { | |
352 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
353 | buffer_put_string(&msg, signature, slen); | |
354 | } else { | |
355 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
356 | } | |
357 | buffer_put_int(&e->output, buffer_len(&msg)); | |
358 | buffer_append(&e->output, buffer_ptr(&msg), | |
359 | buffer_len(&msg)); | |
360 | buffer_free(&msg); | |
36e94dc5 PA |
361 | free(data); |
362 | free(blob); | |
363 | free(signature); | |
c8c467ee | 364 | datafellows = odatafellows; |
16c343f1 PA |
365 | } |
366 | ||
367 | /* shared */ | |
368 | static void | |
369 | process_remove_identity(SocketEntry *e, int version) | |
370 | { | |
36e94dc5 | 371 | u_int blen; |
16c343f1 PA |
372 | int success = 0; |
373 | Key *key = NULL; | |
374 | u_char *blob; | |
36e94dc5 PA |
375 | #ifdef WITH_SSH1 |
376 | u_int bits; | |
377 | #endif /* WITH_SSH1 */ | |
16c343f1 PA |
378 | |
379 | switch (version) { | |
36e94dc5 | 380 | #ifdef WITH_SSH1 |
16c343f1 PA |
381 | case 1: |
382 | key = key_new(KEY_RSA1); | |
383 | bits = buffer_get_int(&e->request); | |
384 | buffer_get_bignum(&e->request, key->rsa->e); | |
385 | buffer_get_bignum(&e->request, key->rsa->n); | |
386 | ||
387 | if (bits != key_size(key)) | |
388 | logit("Warning: identity keysize mismatch: actual %u, announced %u", | |
389 | key_size(key), bits); | |
390 | break; | |
36e94dc5 | 391 | #endif /* WITH_SSH1 */ |
16c343f1 PA |
392 | case 2: |
393 | blob = buffer_get_string(&e->request, &blen); | |
394 | key = key_from_blob(blob, blen); | |
36e94dc5 | 395 | free(blob); |
16c343f1 PA |
396 | break; |
397 | } | |
398 | if (key != NULL) { | |
399 | Identity *id = lookup_identity(key, version); | |
400 | if (id != NULL) { | |
401 | /* | |
402 | * We have this key. Free the old key. Since we | |
403 | * don't want to leave empty slots in the middle of | |
404 | * the array, we actually free the key there and move | |
405 | * all the entries between the empty slot and the end | |
406 | * of the array. | |
407 | */ | |
408 | Idtab *tab = idtab_lookup(version); | |
409 | if (tab->nentries < 1) | |
410 | fatal("process_remove_identity: " | |
411 | "internal error: tab->nentries %d", | |
412 | tab->nentries); | |
413 | TAILQ_REMOVE(&tab->idlist, id, next); | |
414 | free_identity(id); | |
415 | tab->nentries--; | |
416 | success = 1; | |
417 | } | |
418 | key_free(key); | |
419 | } | |
420 | buffer_put_int(&e->output, 1); | |
421 | buffer_put_char(&e->output, | |
422 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
423 | } | |
424 | ||
425 | static void | |
426 | process_remove_all_identities(SocketEntry *e, int version) | |
427 | { | |
428 | Idtab *tab = idtab_lookup(version); | |
429 | Identity *id; | |
430 | ||
431 | /* Loop over all identities and clear the keys. */ | |
432 | for (id = TAILQ_FIRST(&tab->idlist); id; | |
433 | id = TAILQ_FIRST(&tab->idlist)) { | |
434 | TAILQ_REMOVE(&tab->idlist, id, next); | |
435 | free_identity(id); | |
436 | } | |
437 | ||
438 | /* Mark that there are no identities. */ | |
439 | tab->nentries = 0; | |
440 | ||
441 | /* Send success. */ | |
442 | buffer_put_int(&e->output, 1); | |
443 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
444 | } | |
445 | ||
446 | /* removes expired keys and returns number of seconds until the next expiry */ | |
36e94dc5 | 447 | static time_t |
16c343f1 PA |
448 | reaper(void) |
449 | { | |
36e94dc5 | 450 | time_t deadline = 0, now = monotime(); |
16c343f1 PA |
451 | Identity *id, *nxt; |
452 | int version; | |
453 | Idtab *tab; | |
454 | ||
455 | for (version = 1; version < 3; version++) { | |
456 | tab = idtab_lookup(version); | |
457 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
458 | nxt = TAILQ_NEXT(id, next); | |
459 | if (id->death == 0) | |
460 | continue; | |
461 | if (now >= id->death) { | |
462 | debug("expiring key '%s'", id->comment); | |
463 | TAILQ_REMOVE(&tab->idlist, id, next); | |
464 | free_identity(id); | |
465 | tab->nentries--; | |
466 | } else | |
467 | deadline = (deadline == 0) ? id->death : | |
468 | MIN(deadline, id->death); | |
469 | } | |
470 | } | |
471 | if (deadline == 0 || deadline <= now) | |
472 | return 0; | |
473 | else | |
474 | return (deadline - now); | |
475 | } | |
476 | ||
477 | static void | |
478 | process_add_identity(SocketEntry *e, int version) | |
479 | { | |
480 | Idtab *tab = idtab_lookup(version); | |
481 | Identity *id; | |
36e94dc5 PA |
482 | int type, success = 0, confirm = 0; |
483 | char *comment; | |
484 | time_t death = 0; | |
16c343f1 PA |
485 | Key *k = NULL; |
486 | ||
487 | switch (version) { | |
36e94dc5 | 488 | #ifdef WITH_SSH1 |
16c343f1 PA |
489 | case 1: |
490 | k = key_new_private(KEY_RSA1); | |
491 | (void) buffer_get_int(&e->request); /* ignored */ | |
492 | buffer_get_bignum(&e->request, k->rsa->n); | |
493 | buffer_get_bignum(&e->request, k->rsa->e); | |
494 | buffer_get_bignum(&e->request, k->rsa->d); | |
495 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
496 | ||
497 | /* SSH and SSL have p and q swapped */ | |
498 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ | |
499 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
500 | ||
501 | /* Generate additional parameters */ | |
36e94dc5 PA |
502 | if (rsa_generate_additional_parameters(k->rsa) != 0) |
503 | fatal("%s: rsa_generate_additional_parameters " | |
504 | "error", __func__); | |
505 | ||
506 | /* enable blinding */ | |
16c343f1 PA |
507 | if (RSA_blinding_on(k->rsa, NULL) != 1) { |
508 | error("process_add_identity: RSA_blinding_on failed"); | |
509 | key_free(k); | |
510 | goto send; | |
511 | } | |
512 | break; | |
36e94dc5 PA |
513 | #endif /* WITH_SSH1 */ |
514 | case 2: | |
515 | k = key_private_deserialize(&e->request); | |
516 | if (k == NULL) { | |
517 | buffer_clear(&e->request); | |
518 | goto send; | |
519 | } | |
520 | break; | |
16c343f1 | 521 | } |
36e94dc5 | 522 | if (k == NULL) |
16c343f1 | 523 | goto send; |
36e94dc5 PA |
524 | comment = buffer_get_string(&e->request, NULL); |
525 | ||
16c343f1 | 526 | while (buffer_len(&e->request)) { |
c8c467ee | 527 | switch ((type = buffer_get_char(&e->request))) { |
16c343f1 | 528 | case SSH_AGENT_CONSTRAIN_LIFETIME: |
36e94dc5 | 529 | death = monotime() + buffer_get_int(&e->request); |
16c343f1 PA |
530 | break; |
531 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
532 | confirm = 1; | |
533 | break; | |
534 | default: | |
c8c467ee PA |
535 | error("process_add_identity: " |
536 | "Unknown constraint type %d", type); | |
36e94dc5 | 537 | free(comment); |
c8c467ee PA |
538 | key_free(k); |
539 | goto send; | |
16c343f1 PA |
540 | } |
541 | } | |
c8c467ee | 542 | success = 1; |
16c343f1 | 543 | if (lifetime && !death) |
36e94dc5 | 544 | death = monotime() + lifetime; |
16c343f1 | 545 | if ((id = lookup_identity(k, version)) == NULL) { |
856ea928 | 546 | id = xcalloc(1, sizeof(Identity)); |
16c343f1 PA |
547 | id->key = k; |
548 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); | |
549 | /* Increment the number of identities. */ | |
550 | tab->nentries++; | |
551 | } else { | |
552 | key_free(k); | |
36e94dc5 | 553 | free(id->comment); |
16c343f1 PA |
554 | } |
555 | id->comment = comment; | |
556 | id->death = death; | |
557 | id->confirm = confirm; | |
558 | send: | |
559 | buffer_put_int(&e->output, 1); | |
560 | buffer_put_char(&e->output, | |
561 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
562 | } | |
563 | ||
564 | /* XXX todo: encrypt sensitive data with passphrase */ | |
565 | static void | |
566 | process_lock_agent(SocketEntry *e, int lock) | |
567 | { | |
568 | int success = 0; | |
569 | char *passwd; | |
570 | ||
571 | passwd = buffer_get_string(&e->request, NULL); | |
572 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
573 | locked = 0; | |
36e94dc5 PA |
574 | explicit_bzero(lock_passwd, strlen(lock_passwd)); |
575 | free(lock_passwd); | |
16c343f1 PA |
576 | lock_passwd = NULL; |
577 | success = 1; | |
578 | } else if (!locked && lock) { | |
579 | locked = 1; | |
580 | lock_passwd = xstrdup(passwd); | |
581 | success = 1; | |
582 | } | |
36e94dc5 PA |
583 | explicit_bzero(passwd, strlen(passwd)); |
584 | free(passwd); | |
16c343f1 PA |
585 | |
586 | buffer_put_int(&e->output, 1); | |
587 | buffer_put_char(&e->output, | |
588 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
589 | } | |
590 | ||
591 | static void | |
592 | no_identities(SocketEntry *e, u_int type) | |
593 | { | |
594 | Buffer msg; | |
595 | ||
596 | buffer_init(&msg); | |
597 | buffer_put_char(&msg, | |
598 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
599 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
600 | buffer_put_int(&msg, 0); | |
601 | buffer_put_int(&e->output, buffer_len(&msg)); | |
602 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
603 | buffer_free(&msg); | |
604 | } | |
605 | ||
856ea928 | 606 | #ifdef ENABLE_PKCS11 |
16c343f1 | 607 | static void |
c8c467ee | 608 | process_add_smartcard_key(SocketEntry *e) |
16c343f1 | 609 | { |
856ea928 | 610 | char *provider = NULL, *pin; |
36e94dc5 PA |
611 | int i, type, version, count = 0, success = 0, confirm = 0; |
612 | time_t death = 0; | |
856ea928 | 613 | Key **keys = NULL, *k; |
16c343f1 PA |
614 | Identity *id; |
615 | Idtab *tab; | |
616 | ||
856ea928 | 617 | provider = buffer_get_string(&e->request, NULL); |
16c343f1 PA |
618 | pin = buffer_get_string(&e->request, NULL); |
619 | ||
620 | while (buffer_len(&e->request)) { | |
c8c467ee | 621 | switch ((type = buffer_get_char(&e->request))) { |
16c343f1 | 622 | case SSH_AGENT_CONSTRAIN_LIFETIME: |
36e94dc5 | 623 | death = monotime() + buffer_get_int(&e->request); |
16c343f1 PA |
624 | break; |
625 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
626 | confirm = 1; | |
627 | break; | |
628 | default: | |
c8c467ee PA |
629 | error("process_add_smartcard_key: " |
630 | "Unknown constraint type %d", type); | |
c8c467ee | 631 | goto send; |
16c343f1 PA |
632 | } |
633 | } | |
634 | if (lifetime && !death) | |
36e94dc5 | 635 | death = monotime() + lifetime; |
16c343f1 | 636 | |
856ea928 PA |
637 | count = pkcs11_add_provider(provider, pin, &keys); |
638 | for (i = 0; i < count; i++) { | |
16c343f1 PA |
639 | k = keys[i]; |
640 | version = k->type == KEY_RSA1 ? 1 : 2; | |
641 | tab = idtab_lookup(version); | |
642 | if (lookup_identity(k, version) == NULL) { | |
856ea928 | 643 | id = xcalloc(1, sizeof(Identity)); |
16c343f1 | 644 | id->key = k; |
856ea928 PA |
645 | id->provider = xstrdup(provider); |
646 | id->comment = xstrdup(provider); /* XXX */ | |
16c343f1 PA |
647 | id->death = death; |
648 | id->confirm = confirm; | |
649 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); | |
650 | tab->nentries++; | |
651 | success = 1; | |
652 | } else { | |
653 | key_free(k); | |
654 | } | |
655 | keys[i] = NULL; | |
656 | } | |
16c343f1 | 657 | send: |
36e94dc5 PA |
658 | free(pin); |
659 | free(provider); | |
660 | free(keys); | |
16c343f1 PA |
661 | buffer_put_int(&e->output, 1); |
662 | buffer_put_char(&e->output, | |
663 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
664 | } | |
665 | ||
666 | static void | |
667 | process_remove_smartcard_key(SocketEntry *e) | |
668 | { | |
856ea928 PA |
669 | char *provider = NULL, *pin = NULL; |
670 | int version, success = 0; | |
671 | Identity *id, *nxt; | |
16c343f1 PA |
672 | Idtab *tab; |
673 | ||
856ea928 | 674 | provider = buffer_get_string(&e->request, NULL); |
16c343f1 | 675 | pin = buffer_get_string(&e->request, NULL); |
36e94dc5 | 676 | free(pin); |
16c343f1 | 677 | |
856ea928 PA |
678 | for (version = 1; version < 3; version++) { |
679 | tab = idtab_lookup(version); | |
680 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
681 | nxt = TAILQ_NEXT(id, next); | |
36e94dc5 PA |
682 | /* Skip file--based keys */ |
683 | if (id->provider == NULL) | |
684 | continue; | |
856ea928 PA |
685 | if (!strcmp(provider, id->provider)) { |
686 | TAILQ_REMOVE(&tab->idlist, id, next); | |
687 | free_identity(id); | |
688 | tab->nentries--; | |
689 | } | |
16c343f1 | 690 | } |
16c343f1 | 691 | } |
856ea928 PA |
692 | if (pkcs11_del_provider(provider) == 0) |
693 | success = 1; | |
694 | else | |
695 | error("process_remove_smartcard_key:" | |
696 | " pkcs11_del_provider failed"); | |
36e94dc5 | 697 | free(provider); |
16c343f1 PA |
698 | buffer_put_int(&e->output, 1); |
699 | buffer_put_char(&e->output, | |
700 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
701 | } | |
856ea928 | 702 | #endif /* ENABLE_PKCS11 */ |
16c343f1 PA |
703 | |
704 | /* dispatch incoming messages */ | |
705 | ||
706 | static void | |
707 | process_message(SocketEntry *e) | |
708 | { | |
709 | u_int msg_len, type; | |
710 | u_char *cp; | |
711 | ||
712 | if (buffer_len(&e->input) < 5) | |
713 | return; /* Incomplete message. */ | |
714 | cp = buffer_ptr(&e->input); | |
715 | msg_len = get_u32(cp); | |
716 | if (msg_len > 256 * 1024) { | |
717 | close_socket(e); | |
718 | return; | |
719 | } | |
720 | if (buffer_len(&e->input) < msg_len + 4) | |
721 | return; | |
722 | ||
723 | /* move the current input to e->request */ | |
724 | buffer_consume(&e->input, 4); | |
725 | buffer_clear(&e->request); | |
726 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
727 | buffer_consume(&e->input, msg_len); | |
728 | type = buffer_get_char(&e->request); | |
729 | ||
730 | /* check wheter agent is locked */ | |
731 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
732 | buffer_clear(&e->request); | |
733 | switch (type) { | |
734 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
735 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
736 | /* send empty lists */ | |
737 | no_identities(e, type); | |
738 | break; | |
739 | default: | |
740 | /* send a fail message for all other request types */ | |
741 | buffer_put_int(&e->output, 1); | |
742 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
743 | } | |
744 | return; | |
745 | } | |
746 | ||
747 | debug("type %d", type); | |
748 | switch (type) { | |
749 | case SSH_AGENTC_LOCK: | |
750 | case SSH_AGENTC_UNLOCK: | |
751 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
752 | break; | |
36e94dc5 | 753 | #ifdef WITH_SSH1 |
16c343f1 PA |
754 | /* ssh1 */ |
755 | case SSH_AGENTC_RSA_CHALLENGE: | |
756 | process_authentication_challenge1(e); | |
757 | break; | |
758 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
759 | process_request_identities(e, 1); | |
760 | break; | |
761 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
762 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: | |
763 | process_add_identity(e, 1); | |
764 | break; | |
765 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
766 | process_remove_identity(e, 1); | |
767 | break; | |
768 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
769 | process_remove_all_identities(e, 1); | |
770 | break; | |
36e94dc5 | 771 | #endif |
16c343f1 PA |
772 | /* ssh2 */ |
773 | case SSH2_AGENTC_SIGN_REQUEST: | |
774 | process_sign_request2(e); | |
775 | break; | |
776 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
777 | process_request_identities(e, 2); | |
778 | break; | |
779 | case SSH2_AGENTC_ADD_IDENTITY: | |
780 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: | |
781 | process_add_identity(e, 2); | |
782 | break; | |
783 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
784 | process_remove_identity(e, 2); | |
785 | break; | |
786 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
787 | process_remove_all_identities(e, 2); | |
788 | break; | |
856ea928 | 789 | #ifdef ENABLE_PKCS11 |
16c343f1 PA |
790 | case SSH_AGENTC_ADD_SMARTCARD_KEY: |
791 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: | |
792 | process_add_smartcard_key(e); | |
793 | break; | |
794 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: | |
795 | process_remove_smartcard_key(e); | |
796 | break; | |
856ea928 | 797 | #endif /* ENABLE_PKCS11 */ |
16c343f1 PA |
798 | default: |
799 | /* Unknown message. Respond with failure. */ | |
800 | error("Unknown message %d", type); | |
801 | buffer_clear(&e->request); | |
802 | buffer_put_int(&e->output, 1); | |
803 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
804 | break; | |
805 | } | |
806 | } | |
807 | ||
808 | static void | |
809 | new_socket(sock_type type, int fd) | |
810 | { | |
811 | u_int i, old_alloc, new_alloc; | |
812 | ||
813 | set_nonblock(fd); | |
814 | ||
815 | if (fd > max_fd) | |
816 | max_fd = fd; | |
817 | ||
818 | for (i = 0; i < sockets_alloc; i++) | |
819 | if (sockets[i].type == AUTH_UNUSED) { | |
820 | sockets[i].fd = fd; | |
821 | buffer_init(&sockets[i].input); | |
822 | buffer_init(&sockets[i].output); | |
823 | buffer_init(&sockets[i].request); | |
824 | sockets[i].type = type; | |
825 | return; | |
826 | } | |
827 | old_alloc = sockets_alloc; | |
828 | new_alloc = sockets_alloc + 10; | |
829 | sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); | |
830 | for (i = old_alloc; i < new_alloc; i++) | |
831 | sockets[i].type = AUTH_UNUSED; | |
832 | sockets_alloc = new_alloc; | |
833 | sockets[old_alloc].fd = fd; | |
834 | buffer_init(&sockets[old_alloc].input); | |
835 | buffer_init(&sockets[old_alloc].output); | |
836 | buffer_init(&sockets[old_alloc].request); | |
837 | sockets[old_alloc].type = type; | |
838 | } | |
839 | ||
840 | static int | |
841 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp, | |
842 | struct timeval **tvpp) | |
843 | { | |
36e94dc5 | 844 | u_int i, sz; |
16c343f1 PA |
845 | int n = 0; |
846 | static struct timeval tv; | |
36e94dc5 | 847 | time_t deadline; |
16c343f1 PA |
848 | |
849 | for (i = 0; i < sockets_alloc; i++) { | |
850 | switch (sockets[i].type) { | |
851 | case AUTH_SOCKET: | |
852 | case AUTH_CONNECTION: | |
853 | n = MAX(n, sockets[i].fd); | |
854 | break; | |
855 | case AUTH_UNUSED: | |
856 | break; | |
857 | default: | |
858 | fatal("Unknown socket type %d", sockets[i].type); | |
859 | break; | |
860 | } | |
861 | } | |
862 | ||
863 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
864 | if (*fdrp == NULL || sz > *nallocp) { | |
36e94dc5 PA |
865 | free(*fdrp); |
866 | free(*fdwp); | |
16c343f1 PA |
867 | *fdrp = xmalloc(sz); |
868 | *fdwp = xmalloc(sz); | |
869 | *nallocp = sz; | |
870 | } | |
871 | if (n < *fdl) | |
872 | debug("XXX shrink: %d < %d", n, *fdl); | |
873 | *fdl = n; | |
874 | memset(*fdrp, 0, sz); | |
875 | memset(*fdwp, 0, sz); | |
876 | ||
877 | for (i = 0; i < sockets_alloc; i++) { | |
878 | switch (sockets[i].type) { | |
879 | case AUTH_SOCKET: | |
880 | case AUTH_CONNECTION: | |
881 | FD_SET(sockets[i].fd, *fdrp); | |
882 | if (buffer_len(&sockets[i].output) > 0) | |
883 | FD_SET(sockets[i].fd, *fdwp); | |
884 | break; | |
885 | default: | |
886 | break; | |
887 | } | |
888 | } | |
889 | deadline = reaper(); | |
890 | if (parent_alive_interval != 0) | |
891 | deadline = (deadline == 0) ? parent_alive_interval : | |
892 | MIN(deadline, parent_alive_interval); | |
893 | if (deadline == 0) { | |
894 | *tvpp = NULL; | |
895 | } else { | |
896 | tv.tv_sec = deadline; | |
897 | tv.tv_usec = 0; | |
898 | *tvpp = &tv; | |
899 | } | |
900 | return (1); | |
901 | } | |
902 | ||
903 | static void | |
904 | after_select(fd_set *readset, fd_set *writeset) | |
905 | { | |
906 | struct sockaddr_un sunaddr; | |
907 | socklen_t slen; | |
908 | char buf[1024]; | |
909 | int len, sock; | |
856ea928 | 910 | u_int i, orig_alloc; |
16c343f1 PA |
911 | uid_t euid; |
912 | gid_t egid; | |
913 | ||
856ea928 | 914 | for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++) |
16c343f1 PA |
915 | switch (sockets[i].type) { |
916 | case AUTH_UNUSED: | |
917 | break; | |
918 | case AUTH_SOCKET: | |
919 | if (FD_ISSET(sockets[i].fd, readset)) { | |
920 | slen = sizeof(sunaddr); | |
921 | sock = accept(sockets[i].fd, | |
922 | (struct sockaddr *)&sunaddr, &slen); | |
923 | if (sock < 0) { | |
924 | error("accept from AUTH_SOCKET: %s", | |
925 | strerror(errno)); | |
926 | break; | |
927 | } | |
928 | if (getpeereid(sock, &euid, &egid) < 0) { | |
929 | error("getpeereid %d failed: %s", | |
930 | sock, strerror(errno)); | |
931 | close(sock); | |
932 | break; | |
933 | } | |
934 | if ((euid != 0) && (getuid() != euid)) { | |
935 | error("uid mismatch: " | |
936 | "peer euid %u != uid %u", | |
937 | (u_int) euid, (u_int) getuid()); | |
938 | close(sock); | |
939 | break; | |
940 | } | |
941 | new_socket(AUTH_CONNECTION, sock); | |
942 | } | |
943 | break; | |
944 | case AUTH_CONNECTION: | |
945 | if (buffer_len(&sockets[i].output) > 0 && | |
946 | FD_ISSET(sockets[i].fd, writeset)) { | |
856ea928 PA |
947 | len = write(sockets[i].fd, |
948 | buffer_ptr(&sockets[i].output), | |
949 | buffer_len(&sockets[i].output)); | |
950 | if (len == -1 && (errno == EAGAIN || | |
951 | errno == EWOULDBLOCK || | |
952 | errno == EINTR)) | |
953 | continue; | |
16c343f1 PA |
954 | if (len <= 0) { |
955 | close_socket(&sockets[i]); | |
956 | break; | |
957 | } | |
958 | buffer_consume(&sockets[i].output, len); | |
959 | } | |
960 | if (FD_ISSET(sockets[i].fd, readset)) { | |
856ea928 PA |
961 | len = read(sockets[i].fd, buf, sizeof(buf)); |
962 | if (len == -1 && (errno == EAGAIN || | |
963 | errno == EWOULDBLOCK || | |
964 | errno == EINTR)) | |
965 | continue; | |
16c343f1 PA |
966 | if (len <= 0) { |
967 | close_socket(&sockets[i]); | |
968 | break; | |
969 | } | |
970 | buffer_append(&sockets[i].input, buf, len); | |
36e94dc5 | 971 | explicit_bzero(buf, sizeof(buf)); |
16c343f1 PA |
972 | process_message(&sockets[i]); |
973 | } | |
974 | break; | |
975 | default: | |
976 | fatal("Unknown type %d", sockets[i].type); | |
977 | } | |
978 | } | |
979 | ||
980 | static void | |
981 | cleanup_socket(void) | |
982 | { | |
36e94dc5 PA |
983 | if (cleanup_pid != 0 && getpid() != cleanup_pid) |
984 | return; | |
985 | debug("%s: cleanup", __func__); | |
16c343f1 PA |
986 | if (socket_name[0]) |
987 | unlink(socket_name); | |
988 | if (socket_dir[0]) | |
989 | rmdir(socket_dir); | |
990 | } | |
991 | ||
992 | void | |
993 | cleanup_exit(int i) | |
994 | { | |
995 | cleanup_socket(); | |
996 | _exit(i); | |
997 | } | |
998 | ||
999 | /*ARGSUSED*/ | |
1000 | static void | |
1001 | cleanup_handler(int sig) | |
1002 | { | |
1003 | cleanup_socket(); | |
856ea928 PA |
1004 | #ifdef ENABLE_PKCS11 |
1005 | pkcs11_terminate(); | |
1006 | #endif | |
16c343f1 PA |
1007 | _exit(2); |
1008 | } | |
1009 | ||
1010 | static void | |
1011 | check_parent_exists(void) | |
1012 | { | |
1c188a7f PA |
1013 | /* |
1014 | * If our parent has exited then getppid() will return (pid_t)1, | |
1015 | * so testing for that should be safe. | |
1016 | */ | |
1017 | if (parent_pid != -1 && getppid() != parent_pid) { | |
16c343f1 PA |
1018 | /* printf("Parent has died - Authentication agent exiting.\n"); */ |
1019 | cleanup_socket(); | |
1020 | _exit(2); | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | static void | |
1025 | usage(void) | |
1026 | { | |
36e94dc5 PA |
1027 | fprintf(stderr, |
1028 | "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-t life]\n" | |
1029 | " [command [arg ...]]\n" | |
1030 | " ssh-agent [-c | -s] -k\n"); | |
16c343f1 PA |
1031 | exit(1); |
1032 | } | |
1033 | ||
1034 | int | |
1035 | main(int ac, char **av) | |
1036 | { | |
1037 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; | |
1038 | int sock, fd, ch, result, saved_errno; | |
1039 | u_int nalloc; | |
1040 | char *shell, *format, *pidstr, *agentsocket = NULL; | |
1041 | fd_set *readsetp = NULL, *writesetp = NULL; | |
16c343f1 PA |
1042 | #ifdef HAVE_SETRLIMIT |
1043 | struct rlimit rlim; | |
1044 | #endif | |
16c343f1 PA |
1045 | extern int optind; |
1046 | extern char *optarg; | |
1047 | pid_t pid; | |
1048 | char pidstrbuf[1 + 3 * sizeof pid]; | |
1049 | struct timeval *tvp = NULL; | |
40c002af | 1050 | size_t len; |
36e94dc5 | 1051 | mode_t prev_mask; |
16c343f1 PA |
1052 | |
1053 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ | |
1054 | sanitise_stdfd(); | |
1055 | ||
1056 | /* drop */ | |
1057 | setegid(getgid()); | |
1058 | setgid(getgid()); | |
40948e2d | 1059 | setuid(geteuid()); |
16c343f1 PA |
1060 | |
1061 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) | |
1062 | /* Disable ptrace on Linux without sgid bit */ | |
1063 | prctl(PR_SET_DUMPABLE, 0); | |
1064 | #endif | |
1065 | ||
36e94dc5 | 1066 | #ifdef WITH_OPENSSL |
9f304aaf | 1067 | OpenSSL_add_all_algorithms(); |
36e94dc5 | 1068 | #endif |
16c343f1 PA |
1069 | |
1070 | __progname = ssh_get_progname(av[0]); | |
16c343f1 PA |
1071 | seed_rng(); |
1072 | ||
1073 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { | |
1074 | switch (ch) { | |
1075 | case 'c': | |
1076 | if (s_flag) | |
1077 | usage(); | |
1078 | c_flag++; | |
1079 | break; | |
1080 | case 'k': | |
1081 | k_flag++; | |
1082 | break; | |
1083 | case 's': | |
1084 | if (c_flag) | |
1085 | usage(); | |
1086 | s_flag++; | |
1087 | break; | |
1088 | case 'd': | |
1089 | if (d_flag) | |
1090 | usage(); | |
1091 | d_flag++; | |
1092 | break; | |
1093 | case 'a': | |
1094 | agentsocket = optarg; | |
1095 | break; | |
1096 | case 't': | |
1097 | if ((lifetime = convtime(optarg)) == -1) { | |
1098 | fprintf(stderr, "Invalid lifetime\n"); | |
1099 | usage(); | |
1100 | } | |
1101 | break; | |
1102 | default: | |
1103 | usage(); | |
1104 | } | |
1105 | } | |
1106 | ac -= optind; | |
1107 | av += optind; | |
1108 | ||
1109 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) | |
1110 | usage(); | |
1111 | ||
1112 | if (ac == 0 && !c_flag && !s_flag) { | |
1113 | shell = getenv("SHELL"); | |
40c002af PA |
1114 | if (shell != NULL && (len = strlen(shell)) > 2 && |
1115 | strncmp(shell + len - 3, "csh", 3) == 0) | |
16c343f1 PA |
1116 | c_flag = 1; |
1117 | } | |
1118 | if (k_flag) { | |
1119 | const char *errstr = NULL; | |
1120 | ||
1121 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); | |
1122 | if (pidstr == NULL) { | |
1123 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
1124 | SSH_AGENTPID_ENV_NAME); | |
1125 | exit(1); | |
1126 | } | |
1127 | pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); | |
1128 | if (errstr) { | |
1129 | fprintf(stderr, | |
1130 | "%s=\"%s\", which is not a good PID: %s\n", | |
1131 | SSH_AGENTPID_ENV_NAME, pidstr, errstr); | |
1132 | exit(1); | |
1133 | } | |
1134 | if (kill(pid, SIGTERM) == -1) { | |
1135 | perror("kill"); | |
1136 | exit(1); | |
1137 | } | |
1138 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1139 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1140 | printf(format, SSH_AGENTPID_ENV_NAME); | |
1141 | printf("echo Agent pid %ld killed;\n", (long)pid); | |
1142 | exit(0); | |
1143 | } | |
1144 | parent_pid = getpid(); | |
1145 | ||
1146 | if (agentsocket == NULL) { | |
1147 | /* Create private directory for agent socket */ | |
9f304aaf | 1148 | mktemp_proto(socket_dir, sizeof(socket_dir)); |
16c343f1 PA |
1149 | if (mkdtemp(socket_dir) == NULL) { |
1150 | perror("mkdtemp: private socket dir"); | |
1151 | exit(1); | |
1152 | } | |
1153 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, | |
1154 | (long)parent_pid); | |
1155 | } else { | |
1156 | /* Try to use specified agent socket */ | |
1157 | socket_dir[0] = '\0'; | |
1158 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * Create socket early so it will exist before command gets run from | |
1163 | * the parent. | |
1164 | */ | |
16c343f1 | 1165 | prev_mask = umask(0177); |
36e94dc5 PA |
1166 | sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0); |
1167 | if (sock < 0) { | |
1168 | /* XXX - unix_listener() calls error() not perror() */ | |
16c343f1 | 1169 | *socket_name = '\0'; /* Don't unlink any existing file */ |
16c343f1 PA |
1170 | cleanup_exit(1); |
1171 | } | |
1172 | umask(prev_mask); | |
16c343f1 PA |
1173 | |
1174 | /* | |
1175 | * Fork, and have the parent execute the command, if any, or present | |
1176 | * the socket data. The child continues as the authentication agent. | |
1177 | */ | |
1178 | if (d_flag) { | |
1179 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1180 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1181 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1182 | SSH_AUTHSOCKET_ENV_NAME); | |
1183 | printf("echo Agent pid %ld;\n", (long)parent_pid); | |
1184 | goto skip; | |
1185 | } | |
1186 | pid = fork(); | |
1187 | if (pid == -1) { | |
1188 | perror("fork"); | |
1189 | cleanup_exit(1); | |
1190 | } | |
1191 | if (pid != 0) { /* Parent - execute the given command. */ | |
1192 | close(sock); | |
1193 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); | |
1194 | if (ac == 0) { | |
1195 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1196 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1197 | SSH_AUTHSOCKET_ENV_NAME); | |
1198 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, | |
1199 | SSH_AGENTPID_ENV_NAME); | |
1200 | printf("echo Agent pid %ld;\n", (long)pid); | |
1201 | exit(0); | |
1202 | } | |
1203 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || | |
1204 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1205 | perror("setenv"); | |
1206 | exit(1); | |
1207 | } | |
1208 | execvp(av[0], av); | |
1209 | perror(av[0]); | |
1210 | exit(1); | |
1211 | } | |
1212 | /* child */ | |
1213 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
1214 | ||
1215 | if (setsid() == -1) { | |
1216 | error("setsid: %s", strerror(errno)); | |
1217 | cleanup_exit(1); | |
1218 | } | |
1219 | ||
1220 | (void)chdir("/"); | |
1221 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { | |
1222 | /* XXX might close listen socket */ | |
1223 | (void)dup2(fd, STDIN_FILENO); | |
1224 | (void)dup2(fd, STDOUT_FILENO); | |
1225 | (void)dup2(fd, STDERR_FILENO); | |
1226 | if (fd > 2) | |
1227 | close(fd); | |
1228 | } | |
1229 | ||
1230 | #ifdef HAVE_SETRLIMIT | |
1231 | /* deny core dumps, since memory contains unencrypted private keys */ | |
1232 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1233 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
1234 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); | |
1235 | cleanup_exit(1); | |
1236 | } | |
1237 | #endif | |
1238 | ||
1239 | skip: | |
856ea928 | 1240 | |
36e94dc5 PA |
1241 | cleanup_pid = getpid(); |
1242 | ||
856ea928 PA |
1243 | #ifdef ENABLE_PKCS11 |
1244 | pkcs11_init(0); | |
1245 | #endif | |
16c343f1 PA |
1246 | new_socket(AUTH_SOCKET, sock); |
1247 | if (ac > 0) | |
1248 | parent_alive_interval = 10; | |
1249 | idtab_init(); | |
16c343f1 | 1250 | signal(SIGPIPE, SIG_IGN); |
36e94dc5 | 1251 | signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN); |
16c343f1 PA |
1252 | signal(SIGHUP, cleanup_handler); |
1253 | signal(SIGTERM, cleanup_handler); | |
1254 | nalloc = 0; | |
1255 | ||
1256 | while (1) { | |
1257 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp); | |
1258 | result = select(max_fd + 1, readsetp, writesetp, NULL, tvp); | |
1259 | saved_errno = errno; | |
1260 | if (parent_alive_interval != 0) | |
1261 | check_parent_exists(); | |
1262 | (void) reaper(); /* remove expired keys */ | |
1263 | if (result < 0) { | |
1264 | if (saved_errno == EINTR) | |
1265 | continue; | |
1266 | fatal("select: %s", strerror(saved_errno)); | |
1267 | } else if (result > 0) | |
1268 | after_select(readsetp, writesetp); | |
1269 | } | |
1270 | /* NOTREACHED */ | |
1271 | } |