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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * The authentication agent program. | |
6 | * | |
7 | * As far as I am concerned, the code I have written for this software | |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | * | |
13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
34 | */ | |
35 | ||
36 | #include "includes.h" | |
df84fde0 | 37 | #include "openbsd-compat/fake-queue.h" |
38 | RCSID("$OpenBSD: ssh-agent.c,v 1.95 2002/06/19 00:27:55 deraadt Exp $"); | |
3c0ef626 | 39 | |
40 | #include <openssl/evp.h> | |
41 | #include <openssl/md5.h> | |
42 | ||
43 | #include "ssh.h" | |
44 | #include "rsa.h" | |
45 | #include "buffer.h" | |
46 | #include "bufaux.h" | |
47 | #include "xmalloc.h" | |
3c0ef626 | 48 | #include "getput.h" |
3c0ef626 | 49 | #include "key.h" |
50 | #include "authfd.h" | |
3c0ef626 | 51 | #include "compat.h" |
52 | #include "log.h" | |
53 | ||
54 | #ifdef SMARTCARD | |
3c0ef626 | 55 | #include "scard.h" |
56 | #endif | |
57 | ||
df84fde0 | 58 | typedef enum { |
59 | AUTH_UNUSED, | |
60 | AUTH_SOCKET, | |
61 | AUTH_CONNECTION | |
62 | } sock_type; | |
63 | ||
3c0ef626 | 64 | typedef struct { |
65 | int fd; | |
df84fde0 | 66 | sock_type type; |
3c0ef626 | 67 | Buffer input; |
68 | Buffer output; | |
df84fde0 | 69 | Buffer request; |
3c0ef626 | 70 | } SocketEntry; |
71 | ||
72 | u_int sockets_alloc = 0; | |
73 | SocketEntry *sockets = NULL; | |
74 | ||
df84fde0 | 75 | typedef struct identity { |
76 | TAILQ_ENTRY(identity) next; | |
3c0ef626 | 77 | Key *key; |
78 | char *comment; | |
df84fde0 | 79 | u_int death; |
3c0ef626 | 80 | } Identity; |
81 | ||
82 | typedef struct { | |
83 | int nentries; | |
df84fde0 | 84 | TAILQ_HEAD(idqueue, identity) idlist; |
3c0ef626 | 85 | } Idtab; |
86 | ||
87 | /* private key table, one per protocol version */ | |
88 | Idtab idtable[3]; | |
89 | ||
90 | int max_fd = 0; | |
91 | ||
92 | /* pid of shell == parent of agent */ | |
93 | pid_t parent_pid = -1; | |
94 | ||
95 | /* pathname and directory for AUTH_SOCKET */ | |
96 | char socket_name[1024]; | |
97 | char socket_dir[1024]; | |
98 | ||
df84fde0 | 99 | /* locking */ |
100 | int locked = 0; | |
101 | char *lock_passwd = NULL; | |
102 | ||
3c0ef626 | 103 | #ifdef HAVE___PROGNAME |
104 | extern char *__progname; | |
105 | #else | |
106 | char *__progname; | |
107 | #endif | |
108 | ||
109 | static void | |
110 | idtab_init(void) | |
111 | { | |
112 | int i; | |
df84fde0 | 113 | for (i = 0; i <=2; i++) { |
114 | TAILQ_INIT(&idtable[i].idlist); | |
3c0ef626 | 115 | idtable[i].nentries = 0; |
116 | } | |
117 | } | |
118 | ||
119 | /* return private key table for requested protocol version */ | |
120 | static Idtab * | |
121 | idtab_lookup(int version) | |
122 | { | |
123 | if (version < 1 || version > 2) | |
124 | fatal("internal error, bad protocol version %d", version); | |
125 | return &idtable[version]; | |
126 | } | |
127 | ||
df84fde0 | 128 | static void |
129 | free_identity(Identity *id) | |
130 | { | |
131 | key_free(id->key); | |
132 | xfree(id->comment); | |
133 | xfree(id); | |
134 | } | |
135 | ||
3c0ef626 | 136 | /* return matching private key for given public key */ |
df84fde0 | 137 | static Identity * |
138 | lookup_identity(Key *key, int version) | |
3c0ef626 | 139 | { |
df84fde0 | 140 | Identity *id; |
141 | ||
3c0ef626 | 142 | Idtab *tab = idtab_lookup(version); |
df84fde0 | 143 | TAILQ_FOREACH(id, &tab->idlist, next) { |
144 | if (key_equal(key, id->key)) | |
145 | return (id); | |
3c0ef626 | 146 | } |
df84fde0 | 147 | return (NULL); |
3c0ef626 | 148 | } |
149 | ||
150 | /* send list of supported public keys to 'client' */ | |
151 | static void | |
152 | process_request_identities(SocketEntry *e, int version) | |
153 | { | |
154 | Idtab *tab = idtab_lookup(version); | |
155 | Buffer msg; | |
df84fde0 | 156 | Identity *id; |
3c0ef626 | 157 | |
158 | buffer_init(&msg); | |
159 | buffer_put_char(&msg, (version == 1) ? | |
160 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
161 | buffer_put_int(&msg, tab->nentries); | |
df84fde0 | 162 | TAILQ_FOREACH(id, &tab->idlist, next) { |
3c0ef626 | 163 | if (id->key->type == KEY_RSA1) { |
164 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); | |
165 | buffer_put_bignum(&msg, id->key->rsa->e); | |
166 | buffer_put_bignum(&msg, id->key->rsa->n); | |
167 | } else { | |
168 | u_char *blob; | |
169 | u_int blen; | |
170 | key_to_blob(id->key, &blob, &blen); | |
171 | buffer_put_string(&msg, blob, blen); | |
172 | xfree(blob); | |
173 | } | |
174 | buffer_put_cstring(&msg, id->comment); | |
175 | } | |
176 | buffer_put_int(&e->output, buffer_len(&msg)); | |
177 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
178 | buffer_free(&msg); | |
179 | } | |
180 | ||
181 | /* ssh1 only */ | |
182 | static void | |
183 | process_authentication_challenge1(SocketEntry *e) | |
184 | { | |
df84fde0 | 185 | Identity *id; |
186 | Key *key; | |
3c0ef626 | 187 | BIGNUM *challenge; |
188 | int i, len; | |
189 | Buffer msg; | |
190 | MD5_CTX md; | |
191 | u_char buf[32], mdbuf[16], session_id[16]; | |
192 | u_int response_type; | |
193 | ||
194 | buffer_init(&msg); | |
195 | key = key_new(KEY_RSA1); | |
df84fde0 | 196 | if ((challenge = BN_new()) == NULL) |
197 | fatal("process_authentication_challenge1: BN_new failed"); | |
3c0ef626 | 198 | |
df84fde0 | 199 | buffer_get_int(&e->request); /* ignored */ |
200 | buffer_get_bignum(&e->request, key->rsa->e); | |
201 | buffer_get_bignum(&e->request, key->rsa->n); | |
202 | buffer_get_bignum(&e->request, challenge); | |
3c0ef626 | 203 | |
204 | /* Only protocol 1.1 is supported */ | |
df84fde0 | 205 | if (buffer_len(&e->request) == 0) |
3c0ef626 | 206 | goto failure; |
df84fde0 | 207 | buffer_get(&e->request, session_id, 16); |
208 | response_type = buffer_get_int(&e->request); | |
3c0ef626 | 209 | if (response_type != 1) |
210 | goto failure; | |
211 | ||
df84fde0 | 212 | id = lookup_identity(key, 1); |
213 | if (id != NULL) { | |
214 | Key *private = id->key; | |
3c0ef626 | 215 | /* Decrypt the challenge using the private key. */ |
216 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) | |
217 | goto failure; | |
218 | ||
219 | /* The response is MD5 of decrypted challenge plus session id. */ | |
220 | len = BN_num_bytes(challenge); | |
221 | if (len <= 0 || len > 32) { | |
222 | log("process_authentication_challenge: bad challenge length %d", len); | |
223 | goto failure; | |
224 | } | |
225 | memset(buf, 0, 32); | |
226 | BN_bn2bin(challenge, buf + 32 - len); | |
227 | MD5_Init(&md); | |
228 | MD5_Update(&md, buf, 32); | |
229 | MD5_Update(&md, session_id, 16); | |
230 | MD5_Final(mdbuf, &md); | |
231 | ||
232 | /* Send the response. */ | |
233 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
234 | for (i = 0; i < 16; i++) | |
235 | buffer_put_char(&msg, mdbuf[i]); | |
236 | goto send; | |
237 | } | |
238 | ||
239 | failure: | |
240 | /* Unknown identity or protocol error. Send failure. */ | |
241 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
242 | send: | |
243 | buffer_put_int(&e->output, buffer_len(&msg)); | |
244 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
245 | key_free(key); | |
246 | BN_clear_free(challenge); | |
247 | buffer_free(&msg); | |
248 | } | |
249 | ||
250 | /* ssh2 only */ | |
251 | static void | |
252 | process_sign_request2(SocketEntry *e) | |
253 | { | |
254 | extern int datafellows; | |
df84fde0 | 255 | Key *key; |
3c0ef626 | 256 | u_char *blob, *data, *signature = NULL; |
257 | u_int blen, dlen, slen = 0; | |
258 | int flags; | |
259 | Buffer msg; | |
260 | int ok = -1; | |
261 | ||
262 | datafellows = 0; | |
263 | ||
df84fde0 | 264 | blob = buffer_get_string(&e->request, &blen); |
265 | data = buffer_get_string(&e->request, &dlen); | |
3c0ef626 | 266 | |
df84fde0 | 267 | flags = buffer_get_int(&e->request); |
3c0ef626 | 268 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
269 | datafellows = SSH_BUG_SIGBLOB; | |
270 | ||
271 | key = key_from_blob(blob, blen); | |
272 | if (key != NULL) { | |
df84fde0 | 273 | Identity *id = lookup_identity(key, 2); |
274 | if (id != NULL) | |
275 | ok = key_sign(id->key, &signature, &slen, data, dlen); | |
3c0ef626 | 276 | } |
277 | key_free(key); | |
278 | buffer_init(&msg); | |
279 | if (ok == 0) { | |
280 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
281 | buffer_put_string(&msg, signature, slen); | |
282 | } else { | |
283 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
284 | } | |
285 | buffer_put_int(&e->output, buffer_len(&msg)); | |
286 | buffer_append(&e->output, buffer_ptr(&msg), | |
287 | buffer_len(&msg)); | |
288 | buffer_free(&msg); | |
289 | xfree(data); | |
290 | xfree(blob); | |
291 | if (signature != NULL) | |
292 | xfree(signature); | |
293 | } | |
294 | ||
295 | /* shared */ | |
296 | static void | |
297 | process_remove_identity(SocketEntry *e, int version) | |
298 | { | |
df84fde0 | 299 | Key *key = NULL; |
3c0ef626 | 300 | u_char *blob; |
301 | u_int blen; | |
302 | u_int bits; | |
303 | int success = 0; | |
304 | ||
df84fde0 | 305 | switch (version) { |
3c0ef626 | 306 | case 1: |
307 | key = key_new(KEY_RSA1); | |
df84fde0 | 308 | bits = buffer_get_int(&e->request); |
309 | buffer_get_bignum(&e->request, key->rsa->e); | |
310 | buffer_get_bignum(&e->request, key->rsa->n); | |
3c0ef626 | 311 | |
312 | if (bits != key_size(key)) | |
313 | log("Warning: identity keysize mismatch: actual %d, announced %d", | |
314 | key_size(key), bits); | |
315 | break; | |
316 | case 2: | |
df84fde0 | 317 | blob = buffer_get_string(&e->request, &blen); |
3c0ef626 | 318 | key = key_from_blob(blob, blen); |
319 | xfree(blob); | |
320 | break; | |
321 | } | |
322 | if (key != NULL) { | |
df84fde0 | 323 | Identity *id = lookup_identity(key, version); |
324 | if (id != NULL) { | |
3c0ef626 | 325 | /* |
326 | * We have this key. Free the old key. Since we | |
327 | * don\'t want to leave empty slots in the middle of | |
328 | * the array, we actually free the key there and move | |
329 | * all the entries between the empty slot and the end | |
330 | * of the array. | |
331 | */ | |
332 | Idtab *tab = idtab_lookup(version); | |
3c0ef626 | 333 | if (tab->nentries < 1) |
334 | fatal("process_remove_identity: " | |
335 | "internal error: tab->nentries %d", | |
336 | tab->nentries); | |
df84fde0 | 337 | TAILQ_REMOVE(&tab->idlist, id, next); |
338 | free_identity(id); | |
3c0ef626 | 339 | tab->nentries--; |
340 | success = 1; | |
341 | } | |
342 | key_free(key); | |
343 | } | |
344 | buffer_put_int(&e->output, 1); | |
345 | buffer_put_char(&e->output, | |
346 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
347 | } | |
348 | ||
349 | static void | |
350 | process_remove_all_identities(SocketEntry *e, int version) | |
351 | { | |
3c0ef626 | 352 | Idtab *tab = idtab_lookup(version); |
df84fde0 | 353 | Identity *id; |
3c0ef626 | 354 | |
355 | /* Loop over all identities and clear the keys. */ | |
df84fde0 | 356 | for (id = TAILQ_FIRST(&tab->idlist); id; |
357 | id = TAILQ_FIRST(&tab->idlist)) { | |
358 | TAILQ_REMOVE(&tab->idlist, id, next); | |
359 | free_identity(id); | |
3c0ef626 | 360 | } |
361 | ||
362 | /* Mark that there are no identities. */ | |
363 | tab->nentries = 0; | |
364 | ||
365 | /* Send success. */ | |
366 | buffer_put_int(&e->output, 1); | |
367 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
df84fde0 | 368 | } |
369 | ||
370 | static void | |
371 | reaper(void) | |
372 | { | |
373 | Idtab *tab; | |
374 | Identity *id, *nxt; | |
375 | int version; | |
376 | u_int now = time(NULL); | |
377 | ||
378 | for (version = 1; version < 3; version++) { | |
379 | tab = idtab_lookup(version); | |
380 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
381 | nxt = TAILQ_NEXT(id, next); | |
382 | if (id->death != 0 && now >= id->death) { | |
383 | TAILQ_REMOVE(&tab->idlist, id, next); | |
384 | free_identity(id); | |
385 | tab->nentries--; | |
386 | } | |
387 | } | |
388 | } | |
3c0ef626 | 389 | } |
390 | ||
391 | static void | |
392 | process_add_identity(SocketEntry *e, int version) | |
393 | { | |
394 | Key *k = NULL; | |
395 | char *type_name; | |
396 | char *comment; | |
df84fde0 | 397 | int type, success = 0, death = 0; |
3c0ef626 | 398 | Idtab *tab = idtab_lookup(version); |
399 | ||
400 | switch (version) { | |
401 | case 1: | |
402 | k = key_new_private(KEY_RSA1); | |
df84fde0 | 403 | buffer_get_int(&e->request); /* ignored */ |
404 | buffer_get_bignum(&e->request, k->rsa->n); | |
405 | buffer_get_bignum(&e->request, k->rsa->e); | |
406 | buffer_get_bignum(&e->request, k->rsa->d); | |
407 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
3c0ef626 | 408 | |
409 | /* SSH and SSL have p and q swapped */ | |
df84fde0 | 410 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
411 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
3c0ef626 | 412 | |
413 | /* Generate additional parameters */ | |
414 | rsa_generate_additional_parameters(k->rsa); | |
415 | break; | |
416 | case 2: | |
df84fde0 | 417 | type_name = buffer_get_string(&e->request, NULL); |
3c0ef626 | 418 | type = key_type_from_name(type_name); |
419 | xfree(type_name); | |
df84fde0 | 420 | switch (type) { |
3c0ef626 | 421 | case KEY_DSA: |
422 | k = key_new_private(type); | |
df84fde0 | 423 | buffer_get_bignum2(&e->request, k->dsa->p); |
424 | buffer_get_bignum2(&e->request, k->dsa->q); | |
425 | buffer_get_bignum2(&e->request, k->dsa->g); | |
426 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
427 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
3c0ef626 | 428 | break; |
429 | case KEY_RSA: | |
430 | k = key_new_private(type); | |
df84fde0 | 431 | buffer_get_bignum2(&e->request, k->rsa->n); |
432 | buffer_get_bignum2(&e->request, k->rsa->e); | |
433 | buffer_get_bignum2(&e->request, k->rsa->d); | |
434 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
435 | buffer_get_bignum2(&e->request, k->rsa->p); | |
436 | buffer_get_bignum2(&e->request, k->rsa->q); | |
3c0ef626 | 437 | |
438 | /* Generate additional parameters */ | |
439 | rsa_generate_additional_parameters(k->rsa); | |
440 | break; | |
441 | default: | |
df84fde0 | 442 | buffer_clear(&e->request); |
3c0ef626 | 443 | goto send; |
444 | } | |
445 | break; | |
446 | } | |
df84fde0 | 447 | comment = buffer_get_string(&e->request, NULL); |
3c0ef626 | 448 | if (k == NULL) { |
449 | xfree(comment); | |
450 | goto send; | |
451 | } | |
452 | success = 1; | |
df84fde0 | 453 | while (buffer_len(&e->request)) { |
454 | switch (buffer_get_char(&e->request)) { | |
455 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
456 | death = time(NULL) + buffer_get_int(&e->request); | |
457 | break; | |
458 | default: | |
459 | break; | |
460 | } | |
461 | } | |
462 | if (lookup_identity(k, version) == NULL) { | |
463 | Identity *id = xmalloc(sizeof(Identity)); | |
464 | id->key = k; | |
465 | id->comment = comment; | |
466 | id->death = death; | |
467 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); | |
3c0ef626 | 468 | /* Increment the number of identities. */ |
469 | tab->nentries++; | |
470 | } else { | |
471 | key_free(k); | |
472 | xfree(comment); | |
473 | } | |
474 | send: | |
475 | buffer_put_int(&e->output, 1); | |
476 | buffer_put_char(&e->output, | |
477 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
478 | } | |
479 | ||
df84fde0 | 480 | /* XXX todo: encrypt sensitive data with passphrase */ |
481 | static void | |
482 | process_lock_agent(SocketEntry *e, int lock) | |
483 | { | |
484 | char *passwd; | |
485 | int success = 0; | |
486 | ||
487 | passwd = buffer_get_string(&e->request, NULL); | |
488 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
489 | locked = 0; | |
490 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
491 | xfree(lock_passwd); | |
492 | lock_passwd = NULL; | |
493 | success = 1; | |
494 | } else if (!locked && lock) { | |
495 | locked = 1; | |
496 | lock_passwd = xstrdup(passwd); | |
497 | success = 1; | |
498 | } | |
499 | memset(passwd, 0, strlen(passwd)); | |
500 | xfree(passwd); | |
501 | ||
502 | buffer_put_int(&e->output, 1); | |
503 | buffer_put_char(&e->output, | |
504 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
505 | } | |
506 | ||
507 | static void | |
508 | no_identities(SocketEntry *e, u_int type) | |
509 | { | |
510 | Buffer msg; | |
511 | ||
512 | buffer_init(&msg); | |
513 | buffer_put_char(&msg, | |
514 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
515 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
516 | buffer_put_int(&msg, 0); | |
517 | buffer_put_int(&e->output, buffer_len(&msg)); | |
518 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
519 | buffer_free(&msg); | |
520 | } | |
3c0ef626 | 521 | |
522 | #ifdef SMARTCARD | |
523 | static void | |
524 | process_add_smartcard_key (SocketEntry *e) | |
525 | { | |
df84fde0 | 526 | Identity *id; |
3c0ef626 | 527 | Idtab *tab; |
df84fde0 | 528 | Key **keys, *k; |
529 | char *sc_reader_id = NULL, *pin; | |
530 | int i, version, success = 0; | |
531 | ||
532 | sc_reader_id = buffer_get_string(&e->request, NULL); | |
533 | pin = buffer_get_string(&e->request, NULL); | |
534 | keys = sc_get_keys(sc_reader_id, pin); | |
3c0ef626 | 535 | xfree(sc_reader_id); |
df84fde0 | 536 | xfree(pin); |
3c0ef626 | 537 | |
df84fde0 | 538 | if (keys == NULL || keys[0] == NULL) { |
539 | error("sc_get_keys failed"); | |
3c0ef626 | 540 | goto send; |
541 | } | |
df84fde0 | 542 | for (i = 0; keys[i] != NULL; i++) { |
543 | k = keys[i]; | |
544 | version = k->type == KEY_RSA1 ? 1 : 2; | |
545 | tab = idtab_lookup(version); | |
546 | if (lookup_identity(k, version) == NULL) { | |
547 | id = xmalloc(sizeof(Identity)); | |
548 | id->key = k; | |
549 | id->comment = xstrdup("smartcard key"); | |
550 | id->death = 0; | |
551 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); | |
552 | tab->nentries++; | |
553 | success = 1; | |
554 | } else { | |
555 | key_free(k); | |
556 | } | |
557 | keys[i] = NULL; | |
3c0ef626 | 558 | } |
df84fde0 | 559 | xfree(keys); |
3c0ef626 | 560 | send: |
561 | buffer_put_int(&e->output, 1); | |
562 | buffer_put_char(&e->output, | |
563 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
564 | } | |
565 | ||
566 | static void | |
567 | process_remove_smartcard_key(SocketEntry *e) | |
568 | { | |
df84fde0 | 569 | Identity *id; |
570 | Idtab *tab; | |
571 | Key **keys, *k = NULL; | |
572 | char *sc_reader_id = NULL, *pin; | |
573 | int i, version, success = 0; | |
3c0ef626 | 574 | |
df84fde0 | 575 | sc_reader_id = buffer_get_string(&e->request, NULL); |
576 | pin = buffer_get_string(&e->request, NULL); | |
577 | keys = sc_get_keys(sc_reader_id, pin); | |
3c0ef626 | 578 | xfree(sc_reader_id); |
df84fde0 | 579 | xfree(pin); |
3c0ef626 | 580 | |
df84fde0 | 581 | if (keys == NULL || keys[0] == NULL) { |
582 | error("sc_get_keys failed"); | |
583 | goto send; | |
584 | } | |
585 | for (i = 0; keys[i] != NULL; i++) { | |
586 | k = keys[i]; | |
587 | version = k->type == KEY_RSA1 ? 1 : 2; | |
588 | if ((id = lookup_identity(k, version)) != NULL) { | |
589 | tab = idtab_lookup(version); | |
590 | TAILQ_REMOVE(&tab->idlist, id, next); | |
3c0ef626 | 591 | tab->nentries--; |
df84fde0 | 592 | free_identity(id); |
3c0ef626 | 593 | success = 1; |
594 | } | |
595 | key_free(k); | |
df84fde0 | 596 | keys[i] = NULL; |
3c0ef626 | 597 | } |
df84fde0 | 598 | xfree(keys); |
599 | send: | |
3c0ef626 | 600 | buffer_put_int(&e->output, 1); |
601 | buffer_put_char(&e->output, | |
602 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
603 | } | |
604 | #endif /* SMARTCARD */ | |
605 | ||
606 | /* dispatch incoming messages */ | |
607 | ||
608 | static void | |
609 | process_message(SocketEntry *e) | |
610 | { | |
611 | u_int msg_len; | |
612 | u_int type; | |
613 | u_char *cp; | |
df84fde0 | 614 | |
615 | /* kill dead keys */ | |
616 | reaper(); | |
617 | ||
3c0ef626 | 618 | if (buffer_len(&e->input) < 5) |
619 | return; /* Incomplete message. */ | |
df84fde0 | 620 | cp = buffer_ptr(&e->input); |
3c0ef626 | 621 | msg_len = GET_32BIT(cp); |
622 | if (msg_len > 256 * 1024) { | |
623 | shutdown(e->fd, SHUT_RDWR); | |
624 | close(e->fd); | |
625 | e->type = AUTH_UNUSED; | |
df84fde0 | 626 | buffer_free(&e->input); |
627 | buffer_free(&e->output); | |
628 | buffer_free(&e->request); | |
3c0ef626 | 629 | return; |
630 | } | |
631 | if (buffer_len(&e->input) < msg_len + 4) | |
632 | return; | |
df84fde0 | 633 | |
634 | /* move the current input to e->request */ | |
3c0ef626 | 635 | buffer_consume(&e->input, 4); |
df84fde0 | 636 | buffer_clear(&e->request); |
637 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
638 | buffer_consume(&e->input, msg_len); | |
639 | type = buffer_get_char(&e->request); | |
640 | ||
641 | /* check wheter agent is locked */ | |
642 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
643 | buffer_clear(&e->request); | |
644 | switch (type) { | |
645 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
646 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
647 | /* send empty lists */ | |
648 | no_identities(e, type); | |
649 | break; | |
650 | default: | |
651 | /* send a fail message for all other request types */ | |
652 | buffer_put_int(&e->output, 1); | |
653 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
654 | } | |
655 | return; | |
656 | } | |
3c0ef626 | 657 | |
658 | debug("type %d", type); | |
659 | switch (type) { | |
df84fde0 | 660 | case SSH_AGENTC_LOCK: |
661 | case SSH_AGENTC_UNLOCK: | |
662 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
663 | break; | |
3c0ef626 | 664 | /* ssh1 */ |
665 | case SSH_AGENTC_RSA_CHALLENGE: | |
666 | process_authentication_challenge1(e); | |
667 | break; | |
668 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
669 | process_request_identities(e, 1); | |
670 | break; | |
671 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
df84fde0 | 672 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
3c0ef626 | 673 | process_add_identity(e, 1); |
674 | break; | |
675 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
676 | process_remove_identity(e, 1); | |
677 | break; | |
678 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
679 | process_remove_all_identities(e, 1); | |
680 | break; | |
681 | /* ssh2 */ | |
682 | case SSH2_AGENTC_SIGN_REQUEST: | |
683 | process_sign_request2(e); | |
684 | break; | |
685 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
686 | process_request_identities(e, 2); | |
687 | break; | |
688 | case SSH2_AGENTC_ADD_IDENTITY: | |
df84fde0 | 689 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
3c0ef626 | 690 | process_add_identity(e, 2); |
691 | break; | |
692 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
693 | process_remove_identity(e, 2); | |
694 | break; | |
695 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
696 | process_remove_all_identities(e, 2); | |
697 | break; | |
698 | #ifdef SMARTCARD | |
699 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
700 | process_add_smartcard_key(e); | |
df84fde0 | 701 | break; |
3c0ef626 | 702 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
703 | process_remove_smartcard_key(e); | |
df84fde0 | 704 | break; |
3c0ef626 | 705 | #endif /* SMARTCARD */ |
706 | default: | |
707 | /* Unknown message. Respond with failure. */ | |
708 | error("Unknown message %d", type); | |
df84fde0 | 709 | buffer_clear(&e->request); |
3c0ef626 | 710 | buffer_put_int(&e->output, 1); |
711 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
712 | break; | |
713 | } | |
714 | } | |
715 | ||
716 | static void | |
df84fde0 | 717 | new_socket(sock_type type, int fd) |
3c0ef626 | 718 | { |
719 | u_int i, old_alloc; | |
720 | if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) | |
721 | error("fcntl O_NONBLOCK: %s", strerror(errno)); | |
722 | ||
723 | if (fd > max_fd) | |
724 | max_fd = fd; | |
725 | ||
726 | for (i = 0; i < sockets_alloc; i++) | |
727 | if (sockets[i].type == AUTH_UNUSED) { | |
728 | sockets[i].fd = fd; | |
729 | sockets[i].type = type; | |
730 | buffer_init(&sockets[i].input); | |
731 | buffer_init(&sockets[i].output); | |
df84fde0 | 732 | buffer_init(&sockets[i].request); |
3c0ef626 | 733 | return; |
734 | } | |
735 | old_alloc = sockets_alloc; | |
736 | sockets_alloc += 10; | |
737 | if (sockets) | |
738 | sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0])); | |
739 | else | |
740 | sockets = xmalloc(sockets_alloc * sizeof(sockets[0])); | |
741 | for (i = old_alloc; i < sockets_alloc; i++) | |
742 | sockets[i].type = AUTH_UNUSED; | |
743 | sockets[old_alloc].type = type; | |
744 | sockets[old_alloc].fd = fd; | |
745 | buffer_init(&sockets[old_alloc].input); | |
746 | buffer_init(&sockets[old_alloc].output); | |
df84fde0 | 747 | buffer_init(&sockets[old_alloc].request); |
3c0ef626 | 748 | } |
749 | ||
750 | static int | |
751 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, int *nallocp) | |
752 | { | |
753 | u_int i, sz; | |
754 | int n = 0; | |
755 | ||
756 | for (i = 0; i < sockets_alloc; i++) { | |
757 | switch (sockets[i].type) { | |
758 | case AUTH_SOCKET: | |
759 | case AUTH_CONNECTION: | |
760 | n = MAX(n, sockets[i].fd); | |
761 | break; | |
762 | case AUTH_UNUSED: | |
763 | break; | |
764 | default: | |
765 | fatal("Unknown socket type %d", sockets[i].type); | |
766 | break; | |
767 | } | |
768 | } | |
769 | ||
770 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
771 | if (*fdrp == NULL || sz > *nallocp) { | |
772 | if (*fdrp) | |
773 | xfree(*fdrp); | |
774 | if (*fdwp) | |
775 | xfree(*fdwp); | |
776 | *fdrp = xmalloc(sz); | |
777 | *fdwp = xmalloc(sz); | |
778 | *nallocp = sz; | |
779 | } | |
780 | if (n < *fdl) | |
781 | debug("XXX shrink: %d < %d", n, *fdl); | |
782 | *fdl = n; | |
783 | memset(*fdrp, 0, sz); | |
784 | memset(*fdwp, 0, sz); | |
785 | ||
786 | for (i = 0; i < sockets_alloc; i++) { | |
787 | switch (sockets[i].type) { | |
788 | case AUTH_SOCKET: | |
789 | case AUTH_CONNECTION: | |
790 | FD_SET(sockets[i].fd, *fdrp); | |
791 | if (buffer_len(&sockets[i].output) > 0) | |
792 | FD_SET(sockets[i].fd, *fdwp); | |
793 | break; | |
794 | default: | |
795 | break; | |
796 | } | |
797 | } | |
798 | return (1); | |
799 | } | |
800 | ||
801 | static void | |
802 | after_select(fd_set *readset, fd_set *writeset) | |
803 | { | |
804 | u_int i; | |
805 | int len, sock; | |
806 | socklen_t slen; | |
807 | char buf[1024]; | |
808 | struct sockaddr_un sunaddr; | |
809 | ||
810 | for (i = 0; i < sockets_alloc; i++) | |
811 | switch (sockets[i].type) { | |
812 | case AUTH_UNUSED: | |
813 | break; | |
814 | case AUTH_SOCKET: | |
815 | if (FD_ISSET(sockets[i].fd, readset)) { | |
816 | slen = sizeof(sunaddr); | |
817 | sock = accept(sockets[i].fd, | |
818 | (struct sockaddr *) &sunaddr, &slen); | |
819 | if (sock < 0) { | |
df84fde0 | 820 | error("accept from AUTH_SOCKET: %s", |
821 | strerror(errno)); | |
3c0ef626 | 822 | break; |
823 | } | |
824 | new_socket(AUTH_CONNECTION, sock); | |
825 | } | |
826 | break; | |
827 | case AUTH_CONNECTION: | |
828 | if (buffer_len(&sockets[i].output) > 0 && | |
829 | FD_ISSET(sockets[i].fd, writeset)) { | |
830 | do { | |
831 | len = write(sockets[i].fd, | |
832 | buffer_ptr(&sockets[i].output), | |
833 | buffer_len(&sockets[i].output)); | |
834 | if (len == -1 && (errno == EAGAIN || | |
835 | errno == EINTR)) | |
836 | continue; | |
837 | break; | |
838 | } while (1); | |
839 | if (len <= 0) { | |
840 | shutdown(sockets[i].fd, SHUT_RDWR); | |
841 | close(sockets[i].fd); | |
842 | sockets[i].type = AUTH_UNUSED; | |
843 | buffer_free(&sockets[i].input); | |
844 | buffer_free(&sockets[i].output); | |
df84fde0 | 845 | buffer_free(&sockets[i].request); |
3c0ef626 | 846 | break; |
847 | } | |
848 | buffer_consume(&sockets[i].output, len); | |
849 | } | |
850 | if (FD_ISSET(sockets[i].fd, readset)) { | |
851 | do { | |
852 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
853 | if (len == -1 && (errno == EAGAIN || | |
854 | errno == EINTR)) | |
855 | continue; | |
856 | break; | |
857 | } while (1); | |
858 | if (len <= 0) { | |
859 | shutdown(sockets[i].fd, SHUT_RDWR); | |
860 | close(sockets[i].fd); | |
861 | sockets[i].type = AUTH_UNUSED; | |
862 | buffer_free(&sockets[i].input); | |
863 | buffer_free(&sockets[i].output); | |
df84fde0 | 864 | buffer_free(&sockets[i].request); |
3c0ef626 | 865 | break; |
866 | } | |
867 | buffer_append(&sockets[i].input, buf, len); | |
868 | process_message(&sockets[i]); | |
869 | } | |
870 | break; | |
871 | default: | |
872 | fatal("Unknown type %d", sockets[i].type); | |
873 | } | |
874 | } | |
875 | ||
876 | static void | |
df84fde0 | 877 | cleanup_socket(void *p) |
3c0ef626 | 878 | { |
879 | if (socket_name[0]) | |
880 | unlink(socket_name); | |
881 | if (socket_dir[0]) | |
882 | rmdir(socket_dir); | |
883 | } | |
884 | ||
885 | static void | |
886 | cleanup_exit(int i) | |
887 | { | |
df84fde0 | 888 | cleanup_socket(NULL); |
3c0ef626 | 889 | exit(i); |
890 | } | |
891 | ||
892 | static void | |
893 | cleanup_handler(int sig) | |
894 | { | |
df84fde0 | 895 | cleanup_socket(NULL); |
3c0ef626 | 896 | _exit(2); |
897 | } | |
898 | ||
899 | static void | |
900 | check_parent_exists(int sig) | |
901 | { | |
902 | int save_errno = errno; | |
903 | ||
904 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
905 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
906 | cleanup_handler(sig); /* safe */ | |
907 | } | |
908 | signal(SIGALRM, check_parent_exists); | |
909 | alarm(10); | |
910 | errno = save_errno; | |
911 | } | |
912 | ||
913 | static void | |
914 | usage(void) | |
915 | { | |
916 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", | |
917 | __progname); | |
918 | fprintf(stderr, "Options:\n"); | |
919 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
920 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
921 | fprintf(stderr, " -k Kill the current agent.\n"); | |
922 | fprintf(stderr, " -d Debug mode.\n"); | |
df84fde0 | 923 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
3c0ef626 | 924 | exit(1); |
925 | } | |
926 | ||
927 | int | |
928 | main(int ac, char **av) | |
929 | { | |
930 | int sock, c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0, ch, nalloc; | |
931 | struct sockaddr_un sunaddr; | |
932 | #ifdef HAVE_SETRLIMIT | |
933 | struct rlimit rlim; | |
934 | #endif | |
935 | #ifdef HAVE_CYGWIN | |
936 | int prev_mask; | |
937 | #endif | |
938 | pid_t pid; | |
939 | char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid]; | |
df84fde0 | 940 | char *agentsocket = NULL; |
941 | extern char *optarg; | |
3c0ef626 | 942 | extern int optind; |
943 | fd_set *readsetp = NULL, *writesetp = NULL; | |
944 | ||
945 | SSLeay_add_all_algorithms(); | |
946 | ||
947 | __progname = get_progname(av[0]); | |
948 | init_rng(); | |
949 | seed_rng(); | |
950 | ||
951 | #ifdef __GNU_LIBRARY__ | |
df84fde0 | 952 | while ((ch = getopt(ac, av, "+cdksa:")) != -1) { |
3c0ef626 | 953 | #else /* __GNU_LIBRARY__ */ |
df84fde0 | 954 | while ((ch = getopt(ac, av, "cdksa:")) != -1) { |
3c0ef626 | 955 | #endif /* __GNU_LIBRARY__ */ |
956 | switch (ch) { | |
957 | case 'c': | |
958 | if (s_flag) | |
959 | usage(); | |
960 | c_flag++; | |
961 | break; | |
962 | case 'k': | |
963 | k_flag++; | |
964 | break; | |
965 | case 's': | |
966 | if (c_flag) | |
967 | usage(); | |
968 | s_flag++; | |
969 | break; | |
970 | case 'd': | |
971 | if (d_flag) | |
972 | usage(); | |
973 | d_flag++; | |
974 | break; | |
df84fde0 | 975 | case 'a': |
976 | agentsocket = optarg; | |
977 | break; | |
3c0ef626 | 978 | default: |
979 | usage(); | |
980 | } | |
981 | } | |
982 | ac -= optind; | |
983 | av += optind; | |
984 | ||
985 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) | |
986 | usage(); | |
987 | ||
df84fde0 | 988 | if (ac == 0 && !c_flag && !s_flag) { |
3c0ef626 | 989 | shell = getenv("SHELL"); |
990 | if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
991 | c_flag = 1; | |
992 | } | |
993 | if (k_flag) { | |
994 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); | |
995 | if (pidstr == NULL) { | |
996 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
997 | SSH_AGENTPID_ENV_NAME); | |
998 | exit(1); | |
999 | } | |
1000 | pid = atoi(pidstr); | |
1001 | if (pid < 1) { | |
1002 | fprintf(stderr, "%s=\"%s\", which is not a good PID\n", | |
1003 | SSH_AGENTPID_ENV_NAME, pidstr); | |
1004 | exit(1); | |
1005 | } | |
1006 | if (kill(pid, SIGTERM) == -1) { | |
1007 | perror("kill"); | |
1008 | exit(1); | |
1009 | } | |
1010 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1011 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1012 | printf(format, SSH_AGENTPID_ENV_NAME); | |
df84fde0 | 1013 | printf("echo Agent pid %ld killed;\n", (long)pid); |
3c0ef626 | 1014 | exit(0); |
1015 | } | |
1016 | parent_pid = getpid(); | |
1017 | ||
df84fde0 | 1018 | if (agentsocket == NULL) { |
1019 | /* Create private directory for agent socket */ | |
1020 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir); | |
1021 | if (mkdtemp(socket_dir) == NULL) { | |
1022 | perror("mkdtemp: private socket dir"); | |
1023 | exit(1); | |
1024 | } | |
1025 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, | |
1026 | (long)parent_pid); | |
1027 | } else { | |
1028 | /* Try to use specified agent socket */ | |
1029 | socket_dir[0] = '\0'; | |
1030 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
3c0ef626 | 1031 | } |
3c0ef626 | 1032 | |
1033 | /* | |
1034 | * Create socket early so it will exist before command gets run from | |
1035 | * the parent. | |
1036 | */ | |
1037 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1038 | if (sock < 0) { | |
1039 | perror("socket"); | |
1040 | cleanup_exit(1); | |
1041 | } | |
1042 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1043 | sunaddr.sun_family = AF_UNIX; | |
1044 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
1045 | #ifdef HAVE_CYGWIN | |
1046 | prev_mask = umask(0177); | |
1047 | #endif | |
1048 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { | |
1049 | perror("bind"); | |
1050 | #ifdef HAVE_CYGWIN | |
1051 | umask(prev_mask); | |
1052 | #endif | |
1053 | cleanup_exit(1); | |
1054 | } | |
1055 | #ifdef HAVE_CYGWIN | |
1056 | umask(prev_mask); | |
1057 | #endif | |
1058 | if (listen(sock, 5) < 0) { | |
1059 | perror("listen"); | |
1060 | cleanup_exit(1); | |
1061 | } | |
1062 | ||
1063 | /* | |
1064 | * Fork, and have the parent execute the command, if any, or present | |
1065 | * the socket data. The child continues as the authentication agent. | |
1066 | */ | |
1067 | if (d_flag) { | |
1068 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1069 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1070 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1071 | SSH_AUTHSOCKET_ENV_NAME); | |
df84fde0 | 1072 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
3c0ef626 | 1073 | goto skip; |
1074 | } | |
1075 | pid = fork(); | |
1076 | if (pid == -1) { | |
1077 | perror("fork"); | |
df84fde0 | 1078 | cleanup_exit(1); |
3c0ef626 | 1079 | } |
1080 | if (pid != 0) { /* Parent - execute the given command. */ | |
1081 | close(sock); | |
df84fde0 | 1082 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
3c0ef626 | 1083 | if (ac == 0) { |
1084 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1085 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1086 | SSH_AUTHSOCKET_ENV_NAME); | |
1087 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, | |
1088 | SSH_AGENTPID_ENV_NAME); | |
df84fde0 | 1089 | printf("echo Agent pid %ld;\n", (long)pid); |
3c0ef626 | 1090 | exit(0); |
1091 | } | |
1092 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || | |
1093 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1094 | perror("setenv"); | |
1095 | exit(1); | |
1096 | } | |
1097 | execvp(av[0], av); | |
1098 | perror(av[0]); | |
1099 | exit(1); | |
1100 | } | |
df84fde0 | 1101 | /* child */ |
1102 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
3c0ef626 | 1103 | |
1104 | if (setsid() == -1) { | |
df84fde0 | 1105 | error("setsid: %s", strerror(errno)); |
3c0ef626 | 1106 | cleanup_exit(1); |
1107 | } | |
1108 | ||
1109 | (void)chdir("/"); | |
1110 | close(0); | |
1111 | close(1); | |
1112 | close(2); | |
1113 | ||
1114 | #ifdef HAVE_SETRLIMIT | |
1115 | /* deny core dumps, since memory contains unencrypted private keys */ | |
1116 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1117 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
df84fde0 | 1118 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
3c0ef626 | 1119 | cleanup_exit(1); |
1120 | } | |
1121 | #endif | |
1122 | ||
1123 | skip: | |
df84fde0 | 1124 | fatal_add_cleanup(cleanup_socket, NULL); |
3c0ef626 | 1125 | new_socket(AUTH_SOCKET, sock); |
1126 | if (ac > 0) { | |
1127 | signal(SIGALRM, check_parent_exists); | |
1128 | alarm(10); | |
1129 | } | |
1130 | idtab_init(); | |
1131 | if (!d_flag) | |
1132 | signal(SIGINT, SIG_IGN); | |
1133 | signal(SIGPIPE, SIG_IGN); | |
1134 | signal(SIGHUP, cleanup_handler); | |
1135 | signal(SIGTERM, cleanup_handler); | |
1136 | nalloc = 0; | |
1137 | ||
1138 | while (1) { | |
1139 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); | |
1140 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { | |
1141 | if (errno == EINTR) | |
1142 | continue; | |
df84fde0 | 1143 | fatal("select: %s", strerror(errno)); |
3c0ef626 | 1144 | } |
1145 | after_select(readsetp, writesetp); | |
1146 | } | |
1147 | /* NOTREACHED */ | |
1148 | } |