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1 | /* $OpenBSD: ssh-agent.c,v 1.152 2006/08/04 20:46:05 stevesk Exp $ */ | |
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 | ||
52 | #include <openssl/evp.h> | |
53 | #include <openssl/md5.h> | |
54 | ||
55 | #include <errno.h> | |
56 | #include <fcntl.h> | |
57 | #ifdef HAVE_PATHS_H | |
58 | # include <paths.h> | |
59 | #endif | |
60 | #include <signal.h> | |
61 | #include <stdio.h> | |
62 | #include <stdlib.h> | |
63 | #include <time.h> | |
64 | #include <string.h> | |
65 | #include <unistd.h> | |
66 | ||
67 | #include "xmalloc.h" | |
68 | #include "ssh.h" | |
69 | #include "rsa.h" | |
70 | #include "buffer.h" | |
71 | #include "key.h" | |
72 | #include "authfd.h" | |
73 | #include "compat.h" | |
74 | #include "log.h" | |
75 | #include "misc.h" | |
76 | ||
77 | #ifdef SMARTCARD | |
78 | #include "scard.h" | |
79 | #endif | |
80 | ||
81 | #if defined(HAVE_SYS_PRCTL_H) | |
82 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ | |
83 | #endif | |
84 | ||
85 | typedef enum { | |
86 | AUTH_UNUSED, | |
87 | AUTH_SOCKET, | |
88 | AUTH_CONNECTION | |
89 | } sock_type; | |
90 | ||
91 | typedef struct { | |
92 | int fd; | |
93 | sock_type type; | |
94 | Buffer input; | |
95 | Buffer output; | |
96 | Buffer request; | |
97 | } SocketEntry; | |
98 | ||
99 | u_int sockets_alloc = 0; | |
100 | SocketEntry *sockets = NULL; | |
101 | ||
102 | typedef struct identity { | |
103 | TAILQ_ENTRY(identity) next; | |
104 | Key *key; | |
105 | char *comment; | |
106 | u_int death; | |
107 | u_int confirm; | |
108 | } Identity; | |
109 | ||
110 | typedef struct { | |
111 | int nentries; | |
112 | TAILQ_HEAD(idqueue, identity) idlist; | |
113 | } Idtab; | |
114 | ||
115 | /* private key table, one per protocol version */ | |
116 | Idtab idtable[3]; | |
117 | ||
118 | int max_fd = 0; | |
119 | ||
120 | /* pid of shell == parent of agent */ | |
121 | pid_t parent_pid = -1; | |
122 | ||
123 | /* pathname and directory for AUTH_SOCKET */ | |
124 | char socket_name[MAXPATHLEN]; | |
125 | char socket_dir[MAXPATHLEN]; | |
126 | ||
127 | /* locking */ | |
128 | int locked = 0; | |
129 | char *lock_passwd = NULL; | |
130 | ||
131 | extern char *__progname; | |
132 | ||
133 | /* Default lifetime (0 == forever) */ | |
134 | static int lifetime = 0; | |
135 | ||
136 | static void | |
137 | close_socket(SocketEntry *e) | |
138 | { | |
139 | close(e->fd); | |
140 | e->fd = -1; | |
141 | e->type = AUTH_UNUSED; | |
142 | buffer_free(&e->input); | |
143 | buffer_free(&e->output); | |
144 | buffer_free(&e->request); | |
145 | } | |
146 | ||
147 | static void | |
148 | idtab_init(void) | |
149 | { | |
150 | int i; | |
151 | ||
152 | for (i = 0; i <=2; i++) { | |
153 | TAILQ_INIT(&idtable[i].idlist); | |
154 | idtable[i].nentries = 0; | |
155 | } | |
156 | } | |
157 | ||
158 | /* return private key table for requested protocol version */ | |
159 | static Idtab * | |
160 | idtab_lookup(int version) | |
161 | { | |
162 | if (version < 1 || version > 2) | |
163 | fatal("internal error, bad protocol version %d", version); | |
164 | return &idtable[version]; | |
165 | } | |
166 | ||
167 | static void | |
168 | free_identity(Identity *id) | |
169 | { | |
170 | key_free(id->key); | |
171 | xfree(id->comment); | |
172 | xfree(id); | |
173 | } | |
174 | ||
175 | /* return matching private key for given public key */ | |
176 | static Identity * | |
177 | lookup_identity(Key *key, int version) | |
178 | { | |
179 | Identity *id; | |
180 | ||
181 | Idtab *tab = idtab_lookup(version); | |
182 | TAILQ_FOREACH(id, &tab->idlist, next) { | |
183 | if (key_equal(key, id->key)) | |
184 | return (id); | |
185 | } | |
186 | return (NULL); | |
187 | } | |
188 | ||
189 | /* Check confirmation of keysign request */ | |
190 | static int | |
191 | confirm_key(Identity *id) | |
192 | { | |
193 | char *p; | |
194 | int ret = -1; | |
195 | ||
196 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
197 | if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", | |
198 | id->comment, p)) | |
199 | ret = 0; | |
200 | xfree(p); | |
201 | ||
202 | return (ret); | |
203 | } | |
204 | ||
205 | /* send list of supported public keys to 'client' */ | |
206 | static void | |
207 | process_request_identities(SocketEntry *e, int version) | |
208 | { | |
209 | Idtab *tab = idtab_lookup(version); | |
210 | Identity *id; | |
211 | Buffer msg; | |
212 | ||
213 | buffer_init(&msg); | |
214 | buffer_put_char(&msg, (version == 1) ? | |
215 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
216 | buffer_put_int(&msg, tab->nentries); | |
217 | TAILQ_FOREACH(id, &tab->idlist, next) { | |
218 | if (id->key->type == KEY_RSA1) { | |
219 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); | |
220 | buffer_put_bignum(&msg, id->key->rsa->e); | |
221 | buffer_put_bignum(&msg, id->key->rsa->n); | |
222 | } else { | |
223 | u_char *blob; | |
224 | u_int blen; | |
225 | key_to_blob(id->key, &blob, &blen); | |
226 | buffer_put_string(&msg, blob, blen); | |
227 | xfree(blob); | |
228 | } | |
229 | buffer_put_cstring(&msg, id->comment); | |
230 | } | |
231 | buffer_put_int(&e->output, buffer_len(&msg)); | |
232 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
233 | buffer_free(&msg); | |
234 | } | |
235 | ||
236 | /* ssh1 only */ | |
237 | static void | |
238 | process_authentication_challenge1(SocketEntry *e) | |
239 | { | |
240 | u_char buf[32], mdbuf[16], session_id[16]; | |
241 | u_int response_type; | |
242 | BIGNUM *challenge; | |
243 | Identity *id; | |
244 | int i, len; | |
245 | Buffer msg; | |
246 | MD5_CTX md; | |
247 | Key *key; | |
248 | ||
249 | buffer_init(&msg); | |
250 | key = key_new(KEY_RSA1); | |
251 | if ((challenge = BN_new()) == NULL) | |
252 | fatal("process_authentication_challenge1: BN_new failed"); | |
253 | ||
254 | (void) buffer_get_int(&e->request); /* ignored */ | |
255 | buffer_get_bignum(&e->request, key->rsa->e); | |
256 | buffer_get_bignum(&e->request, key->rsa->n); | |
257 | buffer_get_bignum(&e->request, challenge); | |
258 | ||
259 | /* Only protocol 1.1 is supported */ | |
260 | if (buffer_len(&e->request) == 0) | |
261 | goto failure; | |
262 | buffer_get(&e->request, session_id, 16); | |
263 | response_type = buffer_get_int(&e->request); | |
264 | if (response_type != 1) | |
265 | goto failure; | |
266 | ||
267 | id = lookup_identity(key, 1); | |
268 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { | |
269 | Key *private = id->key; | |
270 | /* Decrypt the challenge using the private key. */ | |
271 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) | |
272 | goto failure; | |
273 | ||
274 | /* The response is MD5 of decrypted challenge plus session id. */ | |
275 | len = BN_num_bytes(challenge); | |
276 | if (len <= 0 || len > 32) { | |
277 | logit("process_authentication_challenge: bad challenge length %d", len); | |
278 | goto failure; | |
279 | } | |
280 | memset(buf, 0, 32); | |
281 | BN_bn2bin(challenge, buf + 32 - len); | |
282 | MD5_Init(&md); | |
283 | MD5_Update(&md, buf, 32); | |
284 | MD5_Update(&md, session_id, 16); | |
285 | MD5_Final(mdbuf, &md); | |
286 | ||
287 | /* Send the response. */ | |
288 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
289 | for (i = 0; i < 16; i++) | |
290 | buffer_put_char(&msg, mdbuf[i]); | |
291 | goto send; | |
292 | } | |
293 | ||
294 | failure: | |
295 | /* Unknown identity or protocol error. Send failure. */ | |
296 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
297 | send: | |
298 | buffer_put_int(&e->output, buffer_len(&msg)); | |
299 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
300 | key_free(key); | |
301 | BN_clear_free(challenge); | |
302 | buffer_free(&msg); | |
303 | } | |
304 | ||
305 | /* ssh2 only */ | |
306 | static void | |
307 | process_sign_request2(SocketEntry *e) | |
308 | { | |
309 | u_char *blob, *data, *signature = NULL; | |
310 | u_int blen, dlen, slen = 0; | |
311 | extern int datafellows; | |
312 | int ok = -1, flags; | |
313 | Buffer msg; | |
314 | Key *key; | |
315 | ||
316 | datafellows = 0; | |
317 | ||
318 | blob = buffer_get_string(&e->request, &blen); | |
319 | data = buffer_get_string(&e->request, &dlen); | |
320 | ||
321 | flags = buffer_get_int(&e->request); | |
322 | if (flags & SSH_AGENT_OLD_SIGNATURE) | |
323 | datafellows = SSH_BUG_SIGBLOB; | |
324 | ||
325 | key = key_from_blob(blob, blen); | |
326 | if (key != NULL) { | |
327 | Identity *id = lookup_identity(key, 2); | |
328 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) | |
329 | ok = key_sign(id->key, &signature, &slen, data, dlen); | |
330 | key_free(key); | |
331 | } | |
332 | buffer_init(&msg); | |
333 | if (ok == 0) { | |
334 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
335 | buffer_put_string(&msg, signature, slen); | |
336 | } else { | |
337 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
338 | } | |
339 | buffer_put_int(&e->output, buffer_len(&msg)); | |
340 | buffer_append(&e->output, buffer_ptr(&msg), | |
341 | buffer_len(&msg)); | |
342 | buffer_free(&msg); | |
343 | xfree(data); | |
344 | xfree(blob); | |
345 | if (signature != NULL) | |
346 | xfree(signature); | |
347 | } | |
348 | ||
349 | /* shared */ | |
350 | static void | |
351 | process_remove_identity(SocketEntry *e, int version) | |
352 | { | |
353 | u_int blen, bits; | |
354 | int success = 0; | |
355 | Key *key = NULL; | |
356 | u_char *blob; | |
357 | ||
358 | switch (version) { | |
359 | case 1: | |
360 | key = key_new(KEY_RSA1); | |
361 | bits = buffer_get_int(&e->request); | |
362 | buffer_get_bignum(&e->request, key->rsa->e); | |
363 | buffer_get_bignum(&e->request, key->rsa->n); | |
364 | ||
365 | if (bits != key_size(key)) | |
366 | logit("Warning: identity keysize mismatch: actual %u, announced %u", | |
367 | key_size(key), bits); | |
368 | break; | |
369 | case 2: | |
370 | blob = buffer_get_string(&e->request, &blen); | |
371 | key = key_from_blob(blob, blen); | |
372 | xfree(blob); | |
373 | break; | |
374 | } | |
375 | if (key != NULL) { | |
376 | Identity *id = lookup_identity(key, version); | |
377 | if (id != NULL) { | |
378 | /* | |
379 | * We have this key. Free the old key. Since we | |
380 | * don't want to leave empty slots in the middle of | |
381 | * the array, we actually free the key there and move | |
382 | * all the entries between the empty slot and the end | |
383 | * of the array. | |
384 | */ | |
385 | Idtab *tab = idtab_lookup(version); | |
386 | if (tab->nentries < 1) | |
387 | fatal("process_remove_identity: " | |
388 | "internal error: tab->nentries %d", | |
389 | tab->nentries); | |
390 | TAILQ_REMOVE(&tab->idlist, id, next); | |
391 | free_identity(id); | |
392 | tab->nentries--; | |
393 | success = 1; | |
394 | } | |
395 | key_free(key); | |
396 | } | |
397 | buffer_put_int(&e->output, 1); | |
398 | buffer_put_char(&e->output, | |
399 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
400 | } | |
401 | ||
402 | static void | |
403 | process_remove_all_identities(SocketEntry *e, int version) | |
404 | { | |
405 | Idtab *tab = idtab_lookup(version); | |
406 | Identity *id; | |
407 | ||
408 | /* Loop over all identities and clear the keys. */ | |
409 | for (id = TAILQ_FIRST(&tab->idlist); id; | |
410 | id = TAILQ_FIRST(&tab->idlist)) { | |
411 | TAILQ_REMOVE(&tab->idlist, id, next); | |
412 | free_identity(id); | |
413 | } | |
414 | ||
415 | /* Mark that there are no identities. */ | |
416 | tab->nentries = 0; | |
417 | ||
418 | /* Send success. */ | |
419 | buffer_put_int(&e->output, 1); | |
420 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
421 | } | |
422 | ||
423 | static void | |
424 | reaper(void) | |
425 | { | |
426 | u_int now = time(NULL); | |
427 | Identity *id, *nxt; | |
428 | int version; | |
429 | Idtab *tab; | |
430 | ||
431 | for (version = 1; version < 3; version++) { | |
432 | tab = idtab_lookup(version); | |
433 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
434 | nxt = TAILQ_NEXT(id, next); | |
435 | if (id->death != 0 && now >= id->death) { | |
436 | TAILQ_REMOVE(&tab->idlist, id, next); | |
437 | free_identity(id); | |
438 | tab->nentries--; | |
439 | } | |
440 | } | |
441 | } | |
442 | } | |
443 | ||
444 | static void | |
445 | process_add_identity(SocketEntry *e, int version) | |
446 | { | |
447 | Idtab *tab = idtab_lookup(version); | |
448 | int type, success = 0, death = 0, confirm = 0; | |
449 | char *type_name, *comment; | |
450 | Key *k = NULL; | |
451 | ||
452 | switch (version) { | |
453 | case 1: | |
454 | k = key_new_private(KEY_RSA1); | |
455 | (void) buffer_get_int(&e->request); /* ignored */ | |
456 | buffer_get_bignum(&e->request, k->rsa->n); | |
457 | buffer_get_bignum(&e->request, k->rsa->e); | |
458 | buffer_get_bignum(&e->request, k->rsa->d); | |
459 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
460 | ||
461 | /* SSH and SSL have p and q swapped */ | |
462 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ | |
463 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
464 | ||
465 | /* Generate additional parameters */ | |
466 | rsa_generate_additional_parameters(k->rsa); | |
467 | break; | |
468 | case 2: | |
469 | type_name = buffer_get_string(&e->request, NULL); | |
470 | type = key_type_from_name(type_name); | |
471 | xfree(type_name); | |
472 | switch (type) { | |
473 | case KEY_DSA: | |
474 | k = key_new_private(type); | |
475 | buffer_get_bignum2(&e->request, k->dsa->p); | |
476 | buffer_get_bignum2(&e->request, k->dsa->q); | |
477 | buffer_get_bignum2(&e->request, k->dsa->g); | |
478 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
479 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
480 | break; | |
481 | case KEY_RSA: | |
482 | k = key_new_private(type); | |
483 | buffer_get_bignum2(&e->request, k->rsa->n); | |
484 | buffer_get_bignum2(&e->request, k->rsa->e); | |
485 | buffer_get_bignum2(&e->request, k->rsa->d); | |
486 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
487 | buffer_get_bignum2(&e->request, k->rsa->p); | |
488 | buffer_get_bignum2(&e->request, k->rsa->q); | |
489 | ||
490 | /* Generate additional parameters */ | |
491 | rsa_generate_additional_parameters(k->rsa); | |
492 | break; | |
493 | default: | |
494 | buffer_clear(&e->request); | |
495 | goto send; | |
496 | } | |
497 | break; | |
498 | } | |
499 | /* enable blinding */ | |
500 | switch (k->type) { | |
501 | case KEY_RSA: | |
502 | case KEY_RSA1: | |
503 | if (RSA_blinding_on(k->rsa, NULL) != 1) { | |
504 | error("process_add_identity: RSA_blinding_on failed"); | |
505 | key_free(k); | |
506 | goto send; | |
507 | } | |
508 | break; | |
509 | } | |
510 | comment = buffer_get_string(&e->request, NULL); | |
511 | if (k == NULL) { | |
512 | xfree(comment); | |
513 | goto send; | |
514 | } | |
515 | success = 1; | |
516 | while (buffer_len(&e->request)) { | |
517 | switch (buffer_get_char(&e->request)) { | |
518 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
519 | death = time(NULL) + buffer_get_int(&e->request); | |
520 | break; | |
521 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
522 | confirm = 1; | |
523 | break; | |
524 | default: | |
525 | break; | |
526 | } | |
527 | } | |
528 | if (lifetime && !death) | |
529 | death = time(NULL) + lifetime; | |
530 | if (lookup_identity(k, version) == NULL) { | |
531 | Identity *id = xmalloc(sizeof(Identity)); | |
532 | id->key = k; | |
533 | id->comment = comment; | |
534 | id->death = death; | |
535 | id->confirm = confirm; | |
536 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); | |
537 | /* Increment the number of identities. */ | |
538 | tab->nentries++; | |
539 | } else { | |
540 | key_free(k); | |
541 | xfree(comment); | |
542 | } | |
543 | send: | |
544 | buffer_put_int(&e->output, 1); | |
545 | buffer_put_char(&e->output, | |
546 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
547 | } | |
548 | ||
549 | /* XXX todo: encrypt sensitive data with passphrase */ | |
550 | static void | |
551 | process_lock_agent(SocketEntry *e, int lock) | |
552 | { | |
553 | int success = 0; | |
554 | char *passwd; | |
555 | ||
556 | passwd = buffer_get_string(&e->request, NULL); | |
557 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
558 | locked = 0; | |
559 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
560 | xfree(lock_passwd); | |
561 | lock_passwd = NULL; | |
562 | success = 1; | |
563 | } else if (!locked && lock) { | |
564 | locked = 1; | |
565 | lock_passwd = xstrdup(passwd); | |
566 | success = 1; | |
567 | } | |
568 | memset(passwd, 0, strlen(passwd)); | |
569 | xfree(passwd); | |
570 | ||
571 | buffer_put_int(&e->output, 1); | |
572 | buffer_put_char(&e->output, | |
573 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
574 | } | |
575 | ||
576 | static void | |
577 | no_identities(SocketEntry *e, u_int type) | |
578 | { | |
579 | Buffer msg; | |
580 | ||
581 | buffer_init(&msg); | |
582 | buffer_put_char(&msg, | |
583 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
584 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
585 | buffer_put_int(&msg, 0); | |
586 | buffer_put_int(&e->output, buffer_len(&msg)); | |
587 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
588 | buffer_free(&msg); | |
589 | } | |
590 | ||
591 | #ifdef SMARTCARD | |
592 | static void | |
593 | process_add_smartcard_key (SocketEntry *e) | |
594 | { | |
595 | char *sc_reader_id = NULL, *pin; | |
596 | int i, version, success = 0, death = 0, confirm = 0; | |
597 | Key **keys, *k; | |
598 | Identity *id; | |
599 | Idtab *tab; | |
600 | ||
601 | sc_reader_id = buffer_get_string(&e->request, NULL); | |
602 | pin = buffer_get_string(&e->request, NULL); | |
603 | ||
604 | while (buffer_len(&e->request)) { | |
605 | switch (buffer_get_char(&e->request)) { | |
606 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
607 | death = time(NULL) + buffer_get_int(&e->request); | |
608 | break; | |
609 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
610 | confirm = 1; | |
611 | break; | |
612 | default: | |
613 | break; | |
614 | } | |
615 | } | |
616 | if (lifetime && !death) | |
617 | death = time(NULL) + lifetime; | |
618 | ||
619 | keys = sc_get_keys(sc_reader_id, pin); | |
620 | xfree(sc_reader_id); | |
621 | xfree(pin); | |
622 | ||
623 | if (keys == NULL || keys[0] == NULL) { | |
624 | error("sc_get_keys failed"); | |
625 | goto send; | |
626 | } | |
627 | for (i = 0; keys[i] != NULL; i++) { | |
628 | k = keys[i]; | |
629 | version = k->type == KEY_RSA1 ? 1 : 2; | |
630 | tab = idtab_lookup(version); | |
631 | if (lookup_identity(k, version) == NULL) { | |
632 | id = xmalloc(sizeof(Identity)); | |
633 | id->key = k; | |
634 | id->comment = sc_get_key_label(k); | |
635 | id->death = death; | |
636 | id->confirm = confirm; | |
637 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); | |
638 | tab->nentries++; | |
639 | success = 1; | |
640 | } else { | |
641 | key_free(k); | |
642 | } | |
643 | keys[i] = NULL; | |
644 | } | |
645 | xfree(keys); | |
646 | send: | |
647 | buffer_put_int(&e->output, 1); | |
648 | buffer_put_char(&e->output, | |
649 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
650 | } | |
651 | ||
652 | static void | |
653 | process_remove_smartcard_key(SocketEntry *e) | |
654 | { | |
655 | char *sc_reader_id = NULL, *pin; | |
656 | int i, version, success = 0; | |
657 | Key **keys, *k = NULL; | |
658 | Identity *id; | |
659 | Idtab *tab; | |
660 | ||
661 | sc_reader_id = buffer_get_string(&e->request, NULL); | |
662 | pin = buffer_get_string(&e->request, NULL); | |
663 | keys = sc_get_keys(sc_reader_id, pin); | |
664 | xfree(sc_reader_id); | |
665 | xfree(pin); | |
666 | ||
667 | if (keys == NULL || keys[0] == NULL) { | |
668 | error("sc_get_keys failed"); | |
669 | goto send; | |
670 | } | |
671 | for (i = 0; keys[i] != NULL; i++) { | |
672 | k = keys[i]; | |
673 | version = k->type == KEY_RSA1 ? 1 : 2; | |
674 | if ((id = lookup_identity(k, version)) != NULL) { | |
675 | tab = idtab_lookup(version); | |
676 | TAILQ_REMOVE(&tab->idlist, id, next); | |
677 | tab->nentries--; | |
678 | free_identity(id); | |
679 | success = 1; | |
680 | } | |
681 | key_free(k); | |
682 | keys[i] = NULL; | |
683 | } | |
684 | xfree(keys); | |
685 | send: | |
686 | buffer_put_int(&e->output, 1); | |
687 | buffer_put_char(&e->output, | |
688 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
689 | } | |
690 | #endif /* SMARTCARD */ | |
691 | ||
692 | /* dispatch incoming messages */ | |
693 | ||
694 | static void | |
695 | process_message(SocketEntry *e) | |
696 | { | |
697 | u_int msg_len, type; | |
698 | u_char *cp; | |
699 | ||
700 | /* kill dead keys */ | |
701 | reaper(); | |
702 | ||
703 | if (buffer_len(&e->input) < 5) | |
704 | return; /* Incomplete message. */ | |
705 | cp = buffer_ptr(&e->input); | |
706 | msg_len = get_u32(cp); | |
707 | if (msg_len > 256 * 1024) { | |
708 | close_socket(e); | |
709 | return; | |
710 | } | |
711 | if (buffer_len(&e->input) < msg_len + 4) | |
712 | return; | |
713 | ||
714 | /* move the current input to e->request */ | |
715 | buffer_consume(&e->input, 4); | |
716 | buffer_clear(&e->request); | |
717 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
718 | buffer_consume(&e->input, msg_len); | |
719 | type = buffer_get_char(&e->request); | |
720 | ||
721 | /* check wheter agent is locked */ | |
722 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
723 | buffer_clear(&e->request); | |
724 | switch (type) { | |
725 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
726 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
727 | /* send empty lists */ | |
728 | no_identities(e, type); | |
729 | break; | |
730 | default: | |
731 | /* send a fail message for all other request types */ | |
732 | buffer_put_int(&e->output, 1); | |
733 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
734 | } | |
735 | return; | |
736 | } | |
737 | ||
738 | debug("type %d", type); | |
739 | switch (type) { | |
740 | case SSH_AGENTC_LOCK: | |
741 | case SSH_AGENTC_UNLOCK: | |
742 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
743 | break; | |
744 | /* ssh1 */ | |
745 | case SSH_AGENTC_RSA_CHALLENGE: | |
746 | process_authentication_challenge1(e); | |
747 | break; | |
748 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
749 | process_request_identities(e, 1); | |
750 | break; | |
751 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
752 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: | |
753 | process_add_identity(e, 1); | |
754 | break; | |
755 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
756 | process_remove_identity(e, 1); | |
757 | break; | |
758 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
759 | process_remove_all_identities(e, 1); | |
760 | break; | |
761 | /* ssh2 */ | |
762 | case SSH2_AGENTC_SIGN_REQUEST: | |
763 | process_sign_request2(e); | |
764 | break; | |
765 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
766 | process_request_identities(e, 2); | |
767 | break; | |
768 | case SSH2_AGENTC_ADD_IDENTITY: | |
769 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: | |
770 | process_add_identity(e, 2); | |
771 | break; | |
772 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
773 | process_remove_identity(e, 2); | |
774 | break; | |
775 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
776 | process_remove_all_identities(e, 2); | |
777 | break; | |
778 | #ifdef SMARTCARD | |
779 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
780 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: | |
781 | process_add_smartcard_key(e); | |
782 | break; | |
783 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: | |
784 | process_remove_smartcard_key(e); | |
785 | break; | |
786 | #endif /* SMARTCARD */ | |
787 | default: | |
788 | /* Unknown message. Respond with failure. */ | |
789 | error("Unknown message %d", type); | |
790 | buffer_clear(&e->request); | |
791 | buffer_put_int(&e->output, 1); | |
792 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
793 | break; | |
794 | } | |
795 | } | |
796 | ||
797 | static void | |
798 | new_socket(sock_type type, int fd) | |
799 | { | |
800 | u_int i, old_alloc, new_alloc; | |
801 | ||
802 | set_nonblock(fd); | |
803 | ||
804 | if (fd > max_fd) | |
805 | max_fd = fd; | |
806 | ||
807 | for (i = 0; i < sockets_alloc; i++) | |
808 | if (sockets[i].type == AUTH_UNUSED) { | |
809 | sockets[i].fd = fd; | |
810 | buffer_init(&sockets[i].input); | |
811 | buffer_init(&sockets[i].output); | |
812 | buffer_init(&sockets[i].request); | |
813 | sockets[i].type = type; | |
814 | return; | |
815 | } | |
816 | old_alloc = sockets_alloc; | |
817 | new_alloc = sockets_alloc + 10; | |
818 | sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); | |
819 | for (i = old_alloc; i < new_alloc; i++) | |
820 | sockets[i].type = AUTH_UNUSED; | |
821 | sockets_alloc = new_alloc; | |
822 | sockets[old_alloc].fd = fd; | |
823 | buffer_init(&sockets[old_alloc].input); | |
824 | buffer_init(&sockets[old_alloc].output); | |
825 | buffer_init(&sockets[old_alloc].request); | |
826 | sockets[old_alloc].type = type; | |
827 | } | |
828 | ||
829 | static int | |
830 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp) | |
831 | { | |
832 | u_int i, sz; | |
833 | int n = 0; | |
834 | ||
835 | for (i = 0; i < sockets_alloc; i++) { | |
836 | switch (sockets[i].type) { | |
837 | case AUTH_SOCKET: | |
838 | case AUTH_CONNECTION: | |
839 | n = MAX(n, sockets[i].fd); | |
840 | break; | |
841 | case AUTH_UNUSED: | |
842 | break; | |
843 | default: | |
844 | fatal("Unknown socket type %d", sockets[i].type); | |
845 | break; | |
846 | } | |
847 | } | |
848 | ||
849 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
850 | if (*fdrp == NULL || sz > *nallocp) { | |
851 | if (*fdrp) | |
852 | xfree(*fdrp); | |
853 | if (*fdwp) | |
854 | xfree(*fdwp); | |
855 | *fdrp = xmalloc(sz); | |
856 | *fdwp = xmalloc(sz); | |
857 | *nallocp = sz; | |
858 | } | |
859 | if (n < *fdl) | |
860 | debug("XXX shrink: %d < %d", n, *fdl); | |
861 | *fdl = n; | |
862 | memset(*fdrp, 0, sz); | |
863 | memset(*fdwp, 0, sz); | |
864 | ||
865 | for (i = 0; i < sockets_alloc; i++) { | |
866 | switch (sockets[i].type) { | |
867 | case AUTH_SOCKET: | |
868 | case AUTH_CONNECTION: | |
869 | FD_SET(sockets[i].fd, *fdrp); | |
870 | if (buffer_len(&sockets[i].output) > 0) | |
871 | FD_SET(sockets[i].fd, *fdwp); | |
872 | break; | |
873 | default: | |
874 | break; | |
875 | } | |
876 | } | |
877 | return (1); | |
878 | } | |
879 | ||
880 | static void | |
881 | after_select(fd_set *readset, fd_set *writeset) | |
882 | { | |
883 | struct sockaddr_un sunaddr; | |
884 | socklen_t slen; | |
885 | char buf[1024]; | |
886 | int len, sock; | |
887 | u_int i; | |
888 | uid_t euid; | |
889 | gid_t egid; | |
890 | ||
891 | for (i = 0; i < sockets_alloc; i++) | |
892 | switch (sockets[i].type) { | |
893 | case AUTH_UNUSED: | |
894 | break; | |
895 | case AUTH_SOCKET: | |
896 | if (FD_ISSET(sockets[i].fd, readset)) { | |
897 | slen = sizeof(sunaddr); | |
898 | sock = accept(sockets[i].fd, | |
899 | (struct sockaddr *)&sunaddr, &slen); | |
900 | if (sock < 0) { | |
901 | error("accept from AUTH_SOCKET: %s", | |
902 | strerror(errno)); | |
903 | break; | |
904 | } | |
905 | if (getpeereid(sock, &euid, &egid) < 0) { | |
906 | error("getpeereid %d failed: %s", | |
907 | sock, strerror(errno)); | |
908 | close(sock); | |
909 | break; | |
910 | } | |
911 | if ((euid != 0) && (getuid() != euid)) { | |
912 | error("uid mismatch: " | |
913 | "peer euid %u != uid %u", | |
914 | (u_int) euid, (u_int) getuid()); | |
915 | close(sock); | |
916 | break; | |
917 | } | |
918 | new_socket(AUTH_CONNECTION, sock); | |
919 | } | |
920 | break; | |
921 | case AUTH_CONNECTION: | |
922 | if (buffer_len(&sockets[i].output) > 0 && | |
923 | FD_ISSET(sockets[i].fd, writeset)) { | |
924 | do { | |
925 | len = write(sockets[i].fd, | |
926 | buffer_ptr(&sockets[i].output), | |
927 | buffer_len(&sockets[i].output)); | |
928 | if (len == -1 && (errno == EAGAIN || | |
929 | errno == EINTR)) | |
930 | continue; | |
931 | break; | |
932 | } while (1); | |
933 | if (len <= 0) { | |
934 | close_socket(&sockets[i]); | |
935 | break; | |
936 | } | |
937 | buffer_consume(&sockets[i].output, len); | |
938 | } | |
939 | if (FD_ISSET(sockets[i].fd, readset)) { | |
940 | do { | |
941 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
942 | if (len == -1 && (errno == EAGAIN || | |
943 | errno == EINTR)) | |
944 | continue; | |
945 | break; | |
946 | } while (1); | |
947 | if (len <= 0) { | |
948 | close_socket(&sockets[i]); | |
949 | break; | |
950 | } | |
951 | buffer_append(&sockets[i].input, buf, len); | |
952 | process_message(&sockets[i]); | |
953 | } | |
954 | break; | |
955 | default: | |
956 | fatal("Unknown type %d", sockets[i].type); | |
957 | } | |
958 | } | |
959 | ||
960 | static void | |
961 | cleanup_socket(void) | |
962 | { | |
963 | if (socket_name[0]) | |
964 | unlink(socket_name); | |
965 | if (socket_dir[0]) | |
966 | rmdir(socket_dir); | |
967 | } | |
968 | ||
969 | void | |
970 | cleanup_exit(int i) | |
971 | { | |
972 | cleanup_socket(); | |
973 | _exit(i); | |
974 | } | |
975 | ||
976 | /*ARGSUSED*/ | |
977 | static void | |
978 | cleanup_handler(int sig) | |
979 | { | |
980 | cleanup_socket(); | |
981 | _exit(2); | |
982 | } | |
983 | ||
984 | /*ARGSUSED*/ | |
985 | static void | |
986 | check_parent_exists(int sig) | |
987 | { | |
988 | int save_errno = errno; | |
989 | ||
990 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
991 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
992 | cleanup_handler(sig); /* safe */ | |
993 | } | |
994 | mysignal(SIGALRM, check_parent_exists); | |
995 | alarm(10); | |
996 | errno = save_errno; | |
997 | } | |
998 | ||
999 | static void | |
1000 | usage(void) | |
1001 | { | |
1002 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", | |
1003 | __progname); | |
1004 | fprintf(stderr, "Options:\n"); | |
1005 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
1006 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
1007 | fprintf(stderr, " -k Kill the current agent.\n"); | |
1008 | fprintf(stderr, " -d Debug mode.\n"); | |
1009 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); | |
1010 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); | |
1011 | exit(1); | |
1012 | } | |
1013 | ||
1014 | int | |
1015 | main(int ac, char **av) | |
1016 | { | |
1017 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; | |
1018 | int sock, fd, ch; | |
1019 | u_int nalloc; | |
1020 | char *shell, *format, *pidstr, *agentsocket = NULL; | |
1021 | fd_set *readsetp = NULL, *writesetp = NULL; | |
1022 | struct sockaddr_un sunaddr; | |
1023 | #ifdef HAVE_SETRLIMIT | |
1024 | struct rlimit rlim; | |
1025 | #endif | |
1026 | int prev_mask; | |
1027 | extern int optind; | |
1028 | extern char *optarg; | |
1029 | pid_t pid; | |
1030 | char pidstrbuf[1 + 3 * sizeof pid]; | |
1031 | ||
1032 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ | |
1033 | sanitise_stdfd(); | |
1034 | ||
1035 | /* drop */ | |
1036 | setegid(getgid()); | |
1037 | setgid(getgid()); | |
1038 | ||
1039 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) | |
1040 | /* Disable ptrace on Linux without sgid bit */ | |
1041 | prctl(PR_SET_DUMPABLE, 0); | |
1042 | #endif | |
1043 | ||
1044 | SSLeay_add_all_algorithms(); | |
1045 | ||
1046 | __progname = ssh_get_progname(av[0]); | |
1047 | init_rng(); | |
1048 | seed_rng(); | |
1049 | ||
1050 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { | |
1051 | switch (ch) { | |
1052 | case 'c': | |
1053 | if (s_flag) | |
1054 | usage(); | |
1055 | c_flag++; | |
1056 | break; | |
1057 | case 'k': | |
1058 | k_flag++; | |
1059 | break; | |
1060 | case 's': | |
1061 | if (c_flag) | |
1062 | usage(); | |
1063 | s_flag++; | |
1064 | break; | |
1065 | case 'd': | |
1066 | if (d_flag) | |
1067 | usage(); | |
1068 | d_flag++; | |
1069 | break; | |
1070 | case 'a': | |
1071 | agentsocket = optarg; | |
1072 | break; | |
1073 | case 't': | |
1074 | if ((lifetime = convtime(optarg)) == -1) { | |
1075 | fprintf(stderr, "Invalid lifetime\n"); | |
1076 | usage(); | |
1077 | } | |
1078 | break; | |
1079 | default: | |
1080 | usage(); | |
1081 | } | |
1082 | } | |
1083 | ac -= optind; | |
1084 | av += optind; | |
1085 | ||
1086 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) | |
1087 | usage(); | |
1088 | ||
1089 | if (ac == 0 && !c_flag && !s_flag) { | |
1090 | shell = getenv("SHELL"); | |
1091 | if (shell != NULL && | |
1092 | strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
1093 | c_flag = 1; | |
1094 | } | |
1095 | if (k_flag) { | |
1096 | const char *errstr = NULL; | |
1097 | ||
1098 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); | |
1099 | if (pidstr == NULL) { | |
1100 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
1101 | SSH_AGENTPID_ENV_NAME); | |
1102 | exit(1); | |
1103 | } | |
1104 | pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); | |
1105 | if (errstr) { | |
1106 | fprintf(stderr, | |
1107 | "%s=\"%s\", which is not a good PID: %s\n", | |
1108 | SSH_AGENTPID_ENV_NAME, pidstr, errstr); | |
1109 | exit(1); | |
1110 | } | |
1111 | if (kill(pid, SIGTERM) == -1) { | |
1112 | perror("kill"); | |
1113 | exit(1); | |
1114 | } | |
1115 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1116 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1117 | printf(format, SSH_AGENTPID_ENV_NAME); | |
1118 | printf("echo Agent pid %ld killed;\n", (long)pid); | |
1119 | exit(0); | |
1120 | } | |
1121 | parent_pid = getpid(); | |
1122 | ||
1123 | if (agentsocket == NULL) { | |
1124 | /* Create private directory for agent socket */ | |
1125 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir); | |
1126 | if (mkdtemp(socket_dir) == NULL) { | |
1127 | perror("mkdtemp: private socket dir"); | |
1128 | exit(1); | |
1129 | } | |
1130 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, | |
1131 | (long)parent_pid); | |
1132 | } else { | |
1133 | /* Try to use specified agent socket */ | |
1134 | socket_dir[0] = '\0'; | |
1135 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Create socket early so it will exist before command gets run from | |
1140 | * the parent. | |
1141 | */ | |
1142 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1143 | if (sock < 0) { | |
1144 | perror("socket"); | |
1145 | *socket_name = '\0'; /* Don't unlink any existing file */ | |
1146 | cleanup_exit(1); | |
1147 | } | |
1148 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1149 | sunaddr.sun_family = AF_UNIX; | |
1150 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
1151 | prev_mask = umask(0177); | |
1152 | if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { | |
1153 | perror("bind"); | |
1154 | *socket_name = '\0'; /* Don't unlink any existing file */ | |
1155 | umask(prev_mask); | |
1156 | cleanup_exit(1); | |
1157 | } | |
1158 | umask(prev_mask); | |
1159 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { | |
1160 | perror("listen"); | |
1161 | cleanup_exit(1); | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * Fork, and have the parent execute the command, if any, or present | |
1166 | * the socket data. The child continues as the authentication agent. | |
1167 | */ | |
1168 | if (d_flag) { | |
1169 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1170 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1171 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1172 | SSH_AUTHSOCKET_ENV_NAME); | |
1173 | printf("echo Agent pid %ld;\n", (long)parent_pid); | |
1174 | goto skip; | |
1175 | } | |
1176 | pid = fork(); | |
1177 | if (pid == -1) { | |
1178 | perror("fork"); | |
1179 | cleanup_exit(1); | |
1180 | } | |
1181 | if (pid != 0) { /* Parent - execute the given command. */ | |
1182 | close(sock); | |
1183 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); | |
1184 | if (ac == 0) { | |
1185 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1186 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1187 | SSH_AUTHSOCKET_ENV_NAME); | |
1188 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, | |
1189 | SSH_AGENTPID_ENV_NAME); | |
1190 | printf("echo Agent pid %ld;\n", (long)pid); | |
1191 | exit(0); | |
1192 | } | |
1193 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || | |
1194 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1195 | perror("setenv"); | |
1196 | exit(1); | |
1197 | } | |
1198 | execvp(av[0], av); | |
1199 | perror(av[0]); | |
1200 | exit(1); | |
1201 | } | |
1202 | /* child */ | |
1203 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
1204 | ||
1205 | if (setsid() == -1) { | |
1206 | error("setsid: %s", strerror(errno)); | |
1207 | cleanup_exit(1); | |
1208 | } | |
1209 | ||
1210 | (void)chdir("/"); | |
1211 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { | |
1212 | /* XXX might close listen socket */ | |
1213 | (void)dup2(fd, STDIN_FILENO); | |
1214 | (void)dup2(fd, STDOUT_FILENO); | |
1215 | (void)dup2(fd, STDERR_FILENO); | |
1216 | if (fd > 2) | |
1217 | close(fd); | |
1218 | } | |
1219 | ||
1220 | #ifdef HAVE_SETRLIMIT | |
1221 | /* deny core dumps, since memory contains unencrypted private keys */ | |
1222 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1223 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
1224 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); | |
1225 | cleanup_exit(1); | |
1226 | } | |
1227 | #endif | |
1228 | ||
1229 | skip: | |
1230 | new_socket(AUTH_SOCKET, sock); | |
1231 | if (ac > 0) { | |
1232 | mysignal(SIGALRM, check_parent_exists); | |
1233 | alarm(10); | |
1234 | } | |
1235 | idtab_init(); | |
1236 | if (!d_flag) | |
1237 | signal(SIGINT, SIG_IGN); | |
1238 | signal(SIGPIPE, SIG_IGN); | |
1239 | signal(SIGHUP, cleanup_handler); | |
1240 | signal(SIGTERM, cleanup_handler); | |
1241 | nalloc = 0; | |
1242 | ||
1243 | while (1) { | |
1244 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); | |
1245 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { | |
1246 | if (errno == EINTR) | |
1247 | continue; | |
1248 | fatal("select: %s", strerror(errno)); | |
1249 | } | |
1250 | after_select(readsetp, writesetp); | |
1251 | } | |
1252 | /* NOTREACHED */ | |
1253 | } |