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6f25cbdd | 1 | /* $OpenBSD: ssh-agent.c,v 1.159 2008/06/28 14:05:15 djm Exp $ */ |
3c0ef626 | 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" | |
2e437378 | 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 | |
e54b3d7c | 50 | #include "openbsd-compat/sys-queue.h" |
3c0ef626 | 51 | |
52 | #include <openssl/evp.h> | |
53 | #include <openssl/md5.h> | |
bd5d5d2a | 54 | #include "openbsd-compat/openssl-compat.h" |
3c0ef626 | 55 | |
2e437378 | 56 | #include <errno.h> |
57 | #include <fcntl.h> | |
58 | #ifdef HAVE_PATHS_H | |
59 | # include <paths.h> | |
60 | #endif | |
61 | #include <signal.h> | |
62 | #include <stdarg.h> | |
63 | #include <stdio.h> | |
64 | #include <stdlib.h> | |
65 | #include <time.h> | |
66 | #include <string.h> | |
67 | #include <unistd.h> | |
68 | ||
69 | #include "xmalloc.h" | |
3c0ef626 | 70 | #include "ssh.h" |
71 | #include "rsa.h" | |
72 | #include "buffer.h" | |
3c0ef626 | 73 | #include "key.h" |
74 | #include "authfd.h" | |
3c0ef626 | 75 | #include "compat.h" |
76 | #include "log.h" | |
c95ad3d1 | 77 | #include "pathnames.h" |
1c14df9e | 78 | #include "misc.h" |
3c0ef626 | 79 | |
80 | #ifdef SMARTCARD | |
3c0ef626 | 81 | #include "scard.h" |
82 | #endif | |
83 | ||
2a304a95 | 84 | #if defined(HAVE_SYS_PRCTL_H) |
85 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ | |
86 | #endif | |
87 | ||
e9a17296 | 88 | typedef enum { |
89 | AUTH_UNUSED, | |
90 | AUTH_SOCKET, | |
91 | AUTH_CONNECTION | |
92 | } sock_type; | |
93 | ||
3c0ef626 | 94 | typedef struct { |
95 | int fd; | |
e9a17296 | 96 | sock_type type; |
3c0ef626 | 97 | Buffer input; |
98 | Buffer output; | |
ff2d7a98 | 99 | Buffer request; |
3c0ef626 | 100 | } SocketEntry; |
101 | ||
102 | u_int sockets_alloc = 0; | |
103 | SocketEntry *sockets = NULL; | |
104 | ||
e9a17296 | 105 | typedef struct identity { |
106 | TAILQ_ENTRY(identity) next; | |
3c0ef626 | 107 | Key *key; |
108 | char *comment; | |
ff2d7a98 | 109 | u_int death; |
1c14df9e | 110 | u_int confirm; |
3c0ef626 | 111 | } Identity; |
112 | ||
113 | typedef struct { | |
114 | int nentries; | |
e9a17296 | 115 | TAILQ_HEAD(idqueue, identity) idlist; |
3c0ef626 | 116 | } Idtab; |
117 | ||
118 | /* private key table, one per protocol version */ | |
119 | Idtab idtable[3]; | |
120 | ||
121 | int max_fd = 0; | |
122 | ||
123 | /* pid of shell == parent of agent */ | |
124 | pid_t parent_pid = -1; | |
25d429a2 | 125 | u_int parent_alive_interval = 0; |
3c0ef626 | 126 | |
127 | /* pathname and directory for AUTH_SOCKET */ | |
2e437378 | 128 | char socket_name[MAXPATHLEN]; |
129 | char socket_dir[MAXPATHLEN]; | |
3c0ef626 | 130 | |
ff2d7a98 | 131 | /* locking */ |
132 | int locked = 0; | |
133 | char *lock_passwd = NULL; | |
134 | ||
3c0ef626 | 135 | extern char *__progname; |
3c0ef626 | 136 | |
1c14df9e | 137 | /* Default lifetime (0 == forever) */ |
138 | static int lifetime = 0; | |
139 | ||
e54b3d7c | 140 | static void |
141 | close_socket(SocketEntry *e) | |
142 | { | |
143 | close(e->fd); | |
144 | e->fd = -1; | |
145 | e->type = AUTH_UNUSED; | |
146 | buffer_free(&e->input); | |
147 | buffer_free(&e->output); | |
148 | buffer_free(&e->request); | |
149 | } | |
150 | ||
3c0ef626 | 151 | static void |
152 | idtab_init(void) | |
153 | { | |
154 | int i; | |
ff2d7a98 | 155 | |
e9a17296 | 156 | for (i = 0; i <=2; i++) { |
157 | TAILQ_INIT(&idtable[i].idlist); | |
3c0ef626 | 158 | idtable[i].nentries = 0; |
159 | } | |
160 | } | |
161 | ||
162 | /* return private key table for requested protocol version */ | |
163 | static Idtab * | |
164 | idtab_lookup(int version) | |
165 | { | |
166 | if (version < 1 || version > 2) | |
167 | fatal("internal error, bad protocol version %d", version); | |
168 | return &idtable[version]; | |
169 | } | |
170 | ||
ff2d7a98 | 171 | static void |
172 | free_identity(Identity *id) | |
173 | { | |
174 | key_free(id->key); | |
175 | xfree(id->comment); | |
176 | xfree(id); | |
177 | } | |
178 | ||
3c0ef626 | 179 | /* return matching private key for given public key */ |
e9a17296 | 180 | static Identity * |
181 | lookup_identity(Key *key, int version) | |
3c0ef626 | 182 | { |
e9a17296 | 183 | Identity *id; |
184 | ||
3c0ef626 | 185 | Idtab *tab = idtab_lookup(version); |
e9a17296 | 186 | TAILQ_FOREACH(id, &tab->idlist, next) { |
187 | if (key_equal(key, id->key)) | |
188 | return (id); | |
3c0ef626 | 189 | } |
e9a17296 | 190 | return (NULL); |
191 | } | |
192 | ||
1c14df9e | 193 | /* Check confirmation of keysign request */ |
194 | static int | |
195 | confirm_key(Identity *id) | |
196 | { | |
34fee935 | 197 | char *p; |
1c14df9e | 198 | int ret = -1; |
199 | ||
200 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
34fee935 | 201 | if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", |
202 | id->comment, p)) | |
203 | ret = 0; | |
1c14df9e | 204 | xfree(p); |
34fee935 | 205 | |
1c14df9e | 206 | return (ret); |
207 | } | |
208 | ||
3c0ef626 | 209 | /* send list of supported public keys to 'client' */ |
210 | static void | |
211 | process_request_identities(SocketEntry *e, int version) | |
212 | { | |
213 | Idtab *tab = idtab_lookup(version); | |
e9a17296 | 214 | Identity *id; |
ff2d7a98 | 215 | Buffer msg; |
3c0ef626 | 216 | |
217 | buffer_init(&msg); | |
218 | buffer_put_char(&msg, (version == 1) ? | |
219 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
220 | buffer_put_int(&msg, tab->nentries); | |
e9a17296 | 221 | TAILQ_FOREACH(id, &tab->idlist, next) { |
3c0ef626 | 222 | if (id->key->type == KEY_RSA1) { |
223 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); | |
224 | buffer_put_bignum(&msg, id->key->rsa->e); | |
225 | buffer_put_bignum(&msg, id->key->rsa->n); | |
226 | } else { | |
227 | u_char *blob; | |
228 | u_int blen; | |
229 | key_to_blob(id->key, &blob, &blen); | |
230 | buffer_put_string(&msg, blob, blen); | |
231 | xfree(blob); | |
232 | } | |
233 | buffer_put_cstring(&msg, id->comment); | |
234 | } | |
235 | buffer_put_int(&e->output, buffer_len(&msg)); | |
236 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
237 | buffer_free(&msg); | |
238 | } | |
239 | ||
240 | /* ssh1 only */ | |
241 | static void | |
242 | process_authentication_challenge1(SocketEntry *e) | |
243 | { | |
ff2d7a98 | 244 | u_char buf[32], mdbuf[16], session_id[16]; |
245 | u_int response_type; | |
3c0ef626 | 246 | BIGNUM *challenge; |
ff2d7a98 | 247 | Identity *id; |
3c0ef626 | 248 | int i, len; |
249 | Buffer msg; | |
250 | MD5_CTX md; | |
ff2d7a98 | 251 | Key *key; |
3c0ef626 | 252 | |
253 | buffer_init(&msg); | |
254 | key = key_new(KEY_RSA1); | |
e9a17296 | 255 | if ((challenge = BN_new()) == NULL) |
256 | fatal("process_authentication_challenge1: BN_new failed"); | |
3c0ef626 | 257 | |
ff2d7a98 | 258 | (void) buffer_get_int(&e->request); /* ignored */ |
259 | buffer_get_bignum(&e->request, key->rsa->e); | |
260 | buffer_get_bignum(&e->request, key->rsa->n); | |
261 | buffer_get_bignum(&e->request, challenge); | |
3c0ef626 | 262 | |
263 | /* Only protocol 1.1 is supported */ | |
ff2d7a98 | 264 | if (buffer_len(&e->request) == 0) |
3c0ef626 | 265 | goto failure; |
ff2d7a98 | 266 | buffer_get(&e->request, session_id, 16); |
267 | response_type = buffer_get_int(&e->request); | |
3c0ef626 | 268 | if (response_type != 1) |
269 | goto failure; | |
270 | ||
e9a17296 | 271 | id = lookup_identity(key, 1); |
1c14df9e | 272 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { |
e9a17296 | 273 | Key *private = id->key; |
3c0ef626 | 274 | /* Decrypt the challenge using the private key. */ |
275 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) | |
276 | goto failure; | |
277 | ||
278 | /* The response is MD5 of decrypted challenge plus session id. */ | |
279 | len = BN_num_bytes(challenge); | |
280 | if (len <= 0 || len > 32) { | |
70791e56 | 281 | logit("process_authentication_challenge: bad challenge length %d", len); |
3c0ef626 | 282 | goto failure; |
283 | } | |
284 | memset(buf, 0, 32); | |
285 | BN_bn2bin(challenge, buf + 32 - len); | |
286 | MD5_Init(&md); | |
287 | MD5_Update(&md, buf, 32); | |
288 | MD5_Update(&md, session_id, 16); | |
289 | MD5_Final(mdbuf, &md); | |
290 | ||
291 | /* Send the response. */ | |
292 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
293 | for (i = 0; i < 16; i++) | |
294 | buffer_put_char(&msg, mdbuf[i]); | |
295 | goto send; | |
296 | } | |
297 | ||
298 | failure: | |
299 | /* Unknown identity or protocol error. Send failure. */ | |
300 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
301 | send: | |
302 | buffer_put_int(&e->output, buffer_len(&msg)); | |
303 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
304 | key_free(key); | |
305 | BN_clear_free(challenge); | |
306 | buffer_free(&msg); | |
307 | } | |
308 | ||
309 | /* ssh2 only */ | |
310 | static void | |
311 | process_sign_request2(SocketEntry *e) | |
312 | { | |
3c0ef626 | 313 | u_char *blob, *data, *signature = NULL; |
314 | u_int blen, dlen, slen = 0; | |
ff2d7a98 | 315 | extern int datafellows; |
6f25cbdd | 316 | int odatafellows; |
ff2d7a98 | 317 | int ok = -1, flags; |
3c0ef626 | 318 | Buffer msg; |
ff2d7a98 | 319 | Key *key; |
3c0ef626 | 320 | |
321 | datafellows = 0; | |
322 | ||
ff2d7a98 | 323 | blob = buffer_get_string(&e->request, &blen); |
324 | data = buffer_get_string(&e->request, &dlen); | |
3c0ef626 | 325 | |
ff2d7a98 | 326 | flags = buffer_get_int(&e->request); |
6f25cbdd | 327 | odatafellows = datafellows; |
3c0ef626 | 328 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
329 | datafellows = SSH_BUG_SIGBLOB; | |
330 | ||
331 | key = key_from_blob(blob, blen); | |
332 | if (key != NULL) { | |
e9a17296 | 333 | Identity *id = lookup_identity(key, 2); |
1c14df9e | 334 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) |
e9a17296 | 335 | ok = key_sign(id->key, &signature, &slen, data, dlen); |
2e437378 | 336 | key_free(key); |
3c0ef626 | 337 | } |
3c0ef626 | 338 | buffer_init(&msg); |
339 | if (ok == 0) { | |
340 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
341 | buffer_put_string(&msg, signature, slen); | |
342 | } else { | |
343 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
344 | } | |
345 | buffer_put_int(&e->output, buffer_len(&msg)); | |
346 | buffer_append(&e->output, buffer_ptr(&msg), | |
347 | buffer_len(&msg)); | |
348 | buffer_free(&msg); | |
349 | xfree(data); | |
350 | xfree(blob); | |
351 | if (signature != NULL) | |
352 | xfree(signature); | |
6f25cbdd | 353 | datafellows = odatafellows; |
3c0ef626 | 354 | } |
355 | ||
356 | /* shared */ | |
357 | static void | |
358 | process_remove_identity(SocketEntry *e, int version) | |
359 | { | |
ff2d7a98 | 360 | u_int blen, bits; |
361 | int success = 0; | |
e9a17296 | 362 | Key *key = NULL; |
3c0ef626 | 363 | u_char *blob; |
3c0ef626 | 364 | |
e9a17296 | 365 | switch (version) { |
3c0ef626 | 366 | case 1: |
367 | key = key_new(KEY_RSA1); | |
ff2d7a98 | 368 | bits = buffer_get_int(&e->request); |
369 | buffer_get_bignum(&e->request, key->rsa->e); | |
370 | buffer_get_bignum(&e->request, key->rsa->n); | |
3c0ef626 | 371 | |
372 | if (bits != key_size(key)) | |
70791e56 | 373 | logit("Warning: identity keysize mismatch: actual %u, announced %u", |
3c0ef626 | 374 | key_size(key), bits); |
375 | break; | |
376 | case 2: | |
ff2d7a98 | 377 | blob = buffer_get_string(&e->request, &blen); |
3c0ef626 | 378 | key = key_from_blob(blob, blen); |
379 | xfree(blob); | |
380 | break; | |
381 | } | |
382 | if (key != NULL) { | |
e9a17296 | 383 | Identity *id = lookup_identity(key, version); |
384 | if (id != NULL) { | |
3c0ef626 | 385 | /* |
386 | * We have this key. Free the old key. Since we | |
e00da40d | 387 | * don't want to leave empty slots in the middle of |
3c0ef626 | 388 | * the array, we actually free the key there and move |
389 | * all the entries between the empty slot and the end | |
390 | * of the array. | |
391 | */ | |
392 | Idtab *tab = idtab_lookup(version); | |
3c0ef626 | 393 | if (tab->nentries < 1) |
394 | fatal("process_remove_identity: " | |
395 | "internal error: tab->nentries %d", | |
396 | tab->nentries); | |
e9a17296 | 397 | TAILQ_REMOVE(&tab->idlist, id, next); |
398 | free_identity(id); | |
3c0ef626 | 399 | tab->nentries--; |
400 | success = 1; | |
401 | } | |
402 | key_free(key); | |
403 | } | |
404 | buffer_put_int(&e->output, 1); | |
405 | buffer_put_char(&e->output, | |
406 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
407 | } | |
408 | ||
409 | static void | |
410 | process_remove_all_identities(SocketEntry *e, int version) | |
411 | { | |
3c0ef626 | 412 | Idtab *tab = idtab_lookup(version); |
e9a17296 | 413 | Identity *id; |
3c0ef626 | 414 | |
415 | /* Loop over all identities and clear the keys. */ | |
e9a17296 | 416 | for (id = TAILQ_FIRST(&tab->idlist); id; |
417 | id = TAILQ_FIRST(&tab->idlist)) { | |
418 | TAILQ_REMOVE(&tab->idlist, id, next); | |
419 | free_identity(id); | |
3c0ef626 | 420 | } |
421 | ||
422 | /* Mark that there are no identities. */ | |
423 | tab->nentries = 0; | |
424 | ||
425 | /* Send success. */ | |
426 | buffer_put_int(&e->output, 1); | |
427 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
ff2d7a98 | 428 | } |
429 | ||
25d429a2 | 430 | /* removes expired keys and returns number of seconds until the next expiry */ |
431 | static u_int | |
ff2d7a98 | 432 | reaper(void) |
433 | { | |
25d429a2 | 434 | u_int deadline = 0, now = time(NULL); |
ff2d7a98 | 435 | Identity *id, *nxt; |
436 | int version; | |
437 | Idtab *tab; | |
438 | ||
439 | for (version = 1; version < 3; version++) { | |
440 | tab = idtab_lookup(version); | |
441 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
442 | nxt = TAILQ_NEXT(id, next); | |
25d429a2 | 443 | if (id->death == 0) |
444 | continue; | |
445 | if (now >= id->death) { | |
2278ffa1 | 446 | debug("expiring key '%s'", id->comment); |
ff2d7a98 | 447 | TAILQ_REMOVE(&tab->idlist, id, next); |
448 | free_identity(id); | |
449 | tab->nentries--; | |
25d429a2 | 450 | } else |
451 | deadline = (deadline == 0) ? id->death : | |
452 | MIN(deadline, id->death); | |
ff2d7a98 | 453 | } |
454 | } | |
25d429a2 | 455 | if (deadline == 0 || deadline <= now) |
456 | return 0; | |
457 | else | |
458 | return (deadline - now); | |
3c0ef626 | 459 | } |
460 | ||
461 | static void | |
462 | process_add_identity(SocketEntry *e, int version) | |
463 | { | |
3c0ef626 | 464 | Idtab *tab = idtab_lookup(version); |
bd5d5d2a | 465 | Identity *id; |
1c14df9e | 466 | int type, success = 0, death = 0, confirm = 0; |
ff2d7a98 | 467 | char *type_name, *comment; |
468 | Key *k = NULL; | |
3c0ef626 | 469 | |
470 | switch (version) { | |
471 | case 1: | |
472 | k = key_new_private(KEY_RSA1); | |
ff2d7a98 | 473 | (void) buffer_get_int(&e->request); /* ignored */ |
474 | buffer_get_bignum(&e->request, k->rsa->n); | |
475 | buffer_get_bignum(&e->request, k->rsa->e); | |
476 | buffer_get_bignum(&e->request, k->rsa->d); | |
477 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
3c0ef626 | 478 | |
479 | /* SSH and SSL have p and q swapped */ | |
ff2d7a98 | 480 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
481 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
3c0ef626 | 482 | |
483 | /* Generate additional parameters */ | |
484 | rsa_generate_additional_parameters(k->rsa); | |
485 | break; | |
486 | case 2: | |
ff2d7a98 | 487 | type_name = buffer_get_string(&e->request, NULL); |
3c0ef626 | 488 | type = key_type_from_name(type_name); |
489 | xfree(type_name); | |
e9a17296 | 490 | switch (type) { |
3c0ef626 | 491 | case KEY_DSA: |
492 | k = key_new_private(type); | |
ff2d7a98 | 493 | buffer_get_bignum2(&e->request, k->dsa->p); |
494 | buffer_get_bignum2(&e->request, k->dsa->q); | |
495 | buffer_get_bignum2(&e->request, k->dsa->g); | |
496 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
497 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
3c0ef626 | 498 | break; |
499 | case KEY_RSA: | |
500 | k = key_new_private(type); | |
ff2d7a98 | 501 | buffer_get_bignum2(&e->request, k->rsa->n); |
502 | buffer_get_bignum2(&e->request, k->rsa->e); | |
503 | buffer_get_bignum2(&e->request, k->rsa->d); | |
504 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
505 | buffer_get_bignum2(&e->request, k->rsa->p); | |
506 | buffer_get_bignum2(&e->request, k->rsa->q); | |
3c0ef626 | 507 | |
508 | /* Generate additional parameters */ | |
509 | rsa_generate_additional_parameters(k->rsa); | |
510 | break; | |
511 | default: | |
ff2d7a98 | 512 | buffer_clear(&e->request); |
3c0ef626 | 513 | goto send; |
514 | } | |
515 | break; | |
516 | } | |
1c14df9e | 517 | /* enable blinding */ |
518 | switch (k->type) { | |
519 | case KEY_RSA: | |
520 | case KEY_RSA1: | |
521 | if (RSA_blinding_on(k->rsa, NULL) != 1) { | |
522 | error("process_add_identity: RSA_blinding_on failed"); | |
523 | key_free(k); | |
524 | goto send; | |
525 | } | |
526 | break; | |
527 | } | |
ff2d7a98 | 528 | comment = buffer_get_string(&e->request, NULL); |
3c0ef626 | 529 | if (k == NULL) { |
530 | xfree(comment); | |
531 | goto send; | |
532 | } | |
ff2d7a98 | 533 | while (buffer_len(&e->request)) { |
6f25cbdd | 534 | switch ((type = buffer_get_char(&e->request))) { |
ff2d7a98 | 535 | case SSH_AGENT_CONSTRAIN_LIFETIME: |
536 | death = time(NULL) + buffer_get_int(&e->request); | |
537 | break; | |
1c14df9e | 538 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
539 | confirm = 1; | |
540 | break; | |
ff2d7a98 | 541 | default: |
6f25cbdd | 542 | error("process_add_identity: " |
543 | "Unknown constraint type %d", type); | |
544 | xfree(comment); | |
545 | key_free(k); | |
546 | goto send; | |
ff2d7a98 | 547 | } |
548 | } | |
6f25cbdd | 549 | success = 1; |
1c14df9e | 550 | if (lifetime && !death) |
551 | death = time(NULL) + lifetime; | |
bd5d5d2a | 552 | if ((id = lookup_identity(k, version)) == NULL) { |
553 | id = xmalloc(sizeof(Identity)); | |
e9a17296 | 554 | id->key = k; |
e9a17296 | 555 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
3c0ef626 | 556 | /* Increment the number of identities. */ |
557 | tab->nentries++; | |
558 | } else { | |
559 | key_free(k); | |
bd5d5d2a | 560 | xfree(id->comment); |
3c0ef626 | 561 | } |
bd5d5d2a | 562 | id->comment = comment; |
563 | id->death = death; | |
564 | id->confirm = confirm; | |
3c0ef626 | 565 | send: |
566 | buffer_put_int(&e->output, 1); | |
567 | buffer_put_char(&e->output, | |
568 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
569 | } | |
570 | ||
ff2d7a98 | 571 | /* XXX todo: encrypt sensitive data with passphrase */ |
572 | static void | |
573 | process_lock_agent(SocketEntry *e, int lock) | |
574 | { | |
575 | int success = 0; | |
576 | char *passwd; | |
577 | ||
578 | passwd = buffer_get_string(&e->request, NULL); | |
579 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
580 | locked = 0; | |
581 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
582 | xfree(lock_passwd); | |
583 | lock_passwd = NULL; | |
584 | success = 1; | |
585 | } else if (!locked && lock) { | |
586 | locked = 1; | |
587 | lock_passwd = xstrdup(passwd); | |
588 | success = 1; | |
589 | } | |
590 | memset(passwd, 0, strlen(passwd)); | |
591 | xfree(passwd); | |
592 | ||
593 | buffer_put_int(&e->output, 1); | |
594 | buffer_put_char(&e->output, | |
595 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
596 | } | |
597 | ||
598 | static void | |
599 | no_identities(SocketEntry *e, u_int type) | |
600 | { | |
601 | Buffer msg; | |
602 | ||
603 | buffer_init(&msg); | |
604 | buffer_put_char(&msg, | |
605 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
606 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
607 | buffer_put_int(&msg, 0); | |
608 | buffer_put_int(&e->output, buffer_len(&msg)); | |
609 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
610 | buffer_free(&msg); | |
611 | } | |
3c0ef626 | 612 | |
613 | #ifdef SMARTCARD | |
614 | static void | |
6f25cbdd | 615 | process_add_smartcard_key(SocketEntry *e) |
3c0ef626 | 616 | { |
2980ea68 | 617 | char *sc_reader_id = NULL, *pin; |
6f25cbdd | 618 | int i, type, version, success = 0, death = 0, confirm = 0; |
ff2d7a98 | 619 | Key **keys, *k; |
620 | Identity *id; | |
621 | Idtab *tab; | |
e9a17296 | 622 | |
ff2d7a98 | 623 | sc_reader_id = buffer_get_string(&e->request, NULL); |
624 | pin = buffer_get_string(&e->request, NULL); | |
70791e56 | 625 | |
626 | while (buffer_len(&e->request)) { | |
6f25cbdd | 627 | switch ((type = buffer_get_char(&e->request))) { |
70791e56 | 628 | case SSH_AGENT_CONSTRAIN_LIFETIME: |
629 | death = time(NULL) + buffer_get_int(&e->request); | |
630 | break; | |
631 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
632 | confirm = 1; | |
633 | break; | |
634 | default: | |
6f25cbdd | 635 | error("process_add_smartcard_key: " |
636 | "Unknown constraint type %d", type); | |
637 | xfree(sc_reader_id); | |
638 | xfree(pin); | |
639 | goto send; | |
70791e56 | 640 | } |
641 | } | |
642 | if (lifetime && !death) | |
643 | death = time(NULL) + lifetime; | |
644 | ||
2980ea68 | 645 | keys = sc_get_keys(sc_reader_id, pin); |
3c0ef626 | 646 | xfree(sc_reader_id); |
2980ea68 | 647 | xfree(pin); |
3c0ef626 | 648 | |
2980ea68 | 649 | if (keys == NULL || keys[0] == NULL) { |
650 | error("sc_get_keys failed"); | |
3c0ef626 | 651 | goto send; |
652 | } | |
2980ea68 | 653 | for (i = 0; keys[i] != NULL; i++) { |
654 | k = keys[i]; | |
655 | version = k->type == KEY_RSA1 ? 1 : 2; | |
656 | tab = idtab_lookup(version); | |
657 | if (lookup_identity(k, version) == NULL) { | |
658 | id = xmalloc(sizeof(Identity)); | |
659 | id->key = k; | |
70791e56 | 660 | id->comment = sc_get_key_label(k); |
661 | id->death = death; | |
662 | id->confirm = confirm; | |
2980ea68 | 663 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
664 | tab->nentries++; | |
665 | success = 1; | |
666 | } else { | |
667 | key_free(k); | |
668 | } | |
669 | keys[i] = NULL; | |
3c0ef626 | 670 | } |
2980ea68 | 671 | xfree(keys); |
3c0ef626 | 672 | send: |
673 | buffer_put_int(&e->output, 1); | |
674 | buffer_put_char(&e->output, | |
675 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
676 | } | |
677 | ||
678 | static void | |
679 | process_remove_smartcard_key(SocketEntry *e) | |
680 | { | |
2980ea68 | 681 | char *sc_reader_id = NULL, *pin; |
682 | int i, version, success = 0; | |
ff2d7a98 | 683 | Key **keys, *k = NULL; |
684 | Identity *id; | |
685 | Idtab *tab; | |
3c0ef626 | 686 | |
ff2d7a98 | 687 | sc_reader_id = buffer_get_string(&e->request, NULL); |
688 | pin = buffer_get_string(&e->request, NULL); | |
2980ea68 | 689 | keys = sc_get_keys(sc_reader_id, pin); |
3c0ef626 | 690 | xfree(sc_reader_id); |
2980ea68 | 691 | xfree(pin); |
3c0ef626 | 692 | |
2980ea68 | 693 | if (keys == NULL || keys[0] == NULL) { |
694 | error("sc_get_keys failed"); | |
695 | goto send; | |
696 | } | |
697 | for (i = 0; keys[i] != NULL; i++) { | |
698 | k = keys[i]; | |
699 | version = k->type == KEY_RSA1 ? 1 : 2; | |
700 | if ((id = lookup_identity(k, version)) != NULL) { | |
701 | tab = idtab_lookup(version); | |
ff2d7a98 | 702 | TAILQ_REMOVE(&tab->idlist, id, next); |
3c0ef626 | 703 | tab->nentries--; |
e9a17296 | 704 | free_identity(id); |
3c0ef626 | 705 | success = 1; |
706 | } | |
707 | key_free(k); | |
2980ea68 | 708 | keys[i] = NULL; |
3c0ef626 | 709 | } |
2980ea68 | 710 | xfree(keys); |
711 | send: | |
3c0ef626 | 712 | buffer_put_int(&e->output, 1); |
713 | buffer_put_char(&e->output, | |
714 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
715 | } | |
716 | #endif /* SMARTCARD */ | |
717 | ||
718 | /* dispatch incoming messages */ | |
719 | ||
720 | static void | |
721 | process_message(SocketEntry *e) | |
722 | { | |
ff2d7a98 | 723 | u_int msg_len, type; |
3c0ef626 | 724 | u_char *cp; |
ff2d7a98 | 725 | |
3c0ef626 | 726 | if (buffer_len(&e->input) < 5) |
727 | return; /* Incomplete message. */ | |
e9a17296 | 728 | cp = buffer_ptr(&e->input); |
2e437378 | 729 | msg_len = get_u32(cp); |
3c0ef626 | 730 | if (msg_len > 256 * 1024) { |
e54b3d7c | 731 | close_socket(e); |
3c0ef626 | 732 | return; |
733 | } | |
734 | if (buffer_len(&e->input) < msg_len + 4) | |
735 | return; | |
ff2d7a98 | 736 | |
737 | /* move the current input to e->request */ | |
3c0ef626 | 738 | buffer_consume(&e->input, 4); |
ff2d7a98 | 739 | buffer_clear(&e->request); |
740 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
741 | buffer_consume(&e->input, msg_len); | |
742 | type = buffer_get_char(&e->request); | |
743 | ||
744 | /* check wheter agent is locked */ | |
745 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
746 | buffer_clear(&e->request); | |
747 | switch (type) { | |
748 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
749 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
750 | /* send empty lists */ | |
751 | no_identities(e, type); | |
752 | break; | |
753 | default: | |
754 | /* send a fail message for all other request types */ | |
755 | buffer_put_int(&e->output, 1); | |
756 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
757 | } | |
758 | return; | |
759 | } | |
3c0ef626 | 760 | |
761 | debug("type %d", type); | |
762 | switch (type) { | |
ff2d7a98 | 763 | case SSH_AGENTC_LOCK: |
764 | case SSH_AGENTC_UNLOCK: | |
765 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
766 | break; | |
3c0ef626 | 767 | /* ssh1 */ |
768 | case SSH_AGENTC_RSA_CHALLENGE: | |
769 | process_authentication_challenge1(e); | |
770 | break; | |
771 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
772 | process_request_identities(e, 1); | |
773 | break; | |
774 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
ff2d7a98 | 775 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
3c0ef626 | 776 | process_add_identity(e, 1); |
777 | break; | |
778 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
779 | process_remove_identity(e, 1); | |
780 | break; | |
781 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
782 | process_remove_all_identities(e, 1); | |
783 | break; | |
784 | /* ssh2 */ | |
785 | case SSH2_AGENTC_SIGN_REQUEST: | |
786 | process_sign_request2(e); | |
787 | break; | |
788 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
789 | process_request_identities(e, 2); | |
790 | break; | |
791 | case SSH2_AGENTC_ADD_IDENTITY: | |
ff2d7a98 | 792 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
3c0ef626 | 793 | process_add_identity(e, 2); |
794 | break; | |
795 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
796 | process_remove_identity(e, 2); | |
797 | break; | |
798 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
799 | process_remove_all_identities(e, 2); | |
800 | break; | |
801 | #ifdef SMARTCARD | |
802 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
70791e56 | 803 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: |
3c0ef626 | 804 | process_add_smartcard_key(e); |
e9a17296 | 805 | break; |
3c0ef626 | 806 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
807 | process_remove_smartcard_key(e); | |
e9a17296 | 808 | break; |
3c0ef626 | 809 | #endif /* SMARTCARD */ |
810 | default: | |
811 | /* Unknown message. Respond with failure. */ | |
812 | error("Unknown message %d", type); | |
ff2d7a98 | 813 | buffer_clear(&e->request); |
3c0ef626 | 814 | buffer_put_int(&e->output, 1); |
815 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
816 | break; | |
817 | } | |
818 | } | |
819 | ||
820 | static void | |
e9a17296 | 821 | new_socket(sock_type type, int fd) |
3c0ef626 | 822 | { |
70791e56 | 823 | u_int i, old_alloc, new_alloc; |
ff2d7a98 | 824 | |
1b56ff3d | 825 | set_nonblock(fd); |
3c0ef626 | 826 | |
827 | if (fd > max_fd) | |
828 | max_fd = fd; | |
829 | ||
830 | for (i = 0; i < sockets_alloc; i++) | |
831 | if (sockets[i].type == AUTH_UNUSED) { | |
832 | sockets[i].fd = fd; | |
3c0ef626 | 833 | buffer_init(&sockets[i].input); |
834 | buffer_init(&sockets[i].output); | |
ff2d7a98 | 835 | buffer_init(&sockets[i].request); |
70791e56 | 836 | sockets[i].type = type; |
3c0ef626 | 837 | return; |
838 | } | |
839 | old_alloc = sockets_alloc; | |
70791e56 | 840 | new_alloc = sockets_alloc + 10; |
2e437378 | 841 | sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); |
70791e56 | 842 | for (i = old_alloc; i < new_alloc; i++) |
3c0ef626 | 843 | sockets[i].type = AUTH_UNUSED; |
70791e56 | 844 | sockets_alloc = new_alloc; |
3c0ef626 | 845 | sockets[old_alloc].fd = fd; |
846 | buffer_init(&sockets[old_alloc].input); | |
847 | buffer_init(&sockets[old_alloc].output); | |
ff2d7a98 | 848 | buffer_init(&sockets[old_alloc].request); |
70791e56 | 849 | sockets[old_alloc].type = type; |
3c0ef626 | 850 | } |
851 | ||
852 | static int | |
25d429a2 | 853 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp, |
854 | struct timeval **tvpp) | |
3c0ef626 | 855 | { |
25d429a2 | 856 | u_int i, sz, deadline; |
3c0ef626 | 857 | int n = 0; |
25d429a2 | 858 | static struct timeval tv; |
3c0ef626 | 859 | |
860 | for (i = 0; i < sockets_alloc; i++) { | |
861 | switch (sockets[i].type) { | |
862 | case AUTH_SOCKET: | |
863 | case AUTH_CONNECTION: | |
864 | n = MAX(n, sockets[i].fd); | |
865 | break; | |
866 | case AUTH_UNUSED: | |
867 | break; | |
868 | default: | |
869 | fatal("Unknown socket type %d", sockets[i].type); | |
870 | break; | |
871 | } | |
872 | } | |
873 | ||
874 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
875 | if (*fdrp == NULL || sz > *nallocp) { | |
876 | if (*fdrp) | |
877 | xfree(*fdrp); | |
878 | if (*fdwp) | |
879 | xfree(*fdwp); | |
880 | *fdrp = xmalloc(sz); | |
881 | *fdwp = xmalloc(sz); | |
882 | *nallocp = sz; | |
883 | } | |
884 | if (n < *fdl) | |
885 | debug("XXX shrink: %d < %d", n, *fdl); | |
886 | *fdl = n; | |
887 | memset(*fdrp, 0, sz); | |
888 | memset(*fdwp, 0, sz); | |
889 | ||
890 | for (i = 0; i < sockets_alloc; i++) { | |
891 | switch (sockets[i].type) { | |
892 | case AUTH_SOCKET: | |
893 | case AUTH_CONNECTION: | |
894 | FD_SET(sockets[i].fd, *fdrp); | |
895 | if (buffer_len(&sockets[i].output) > 0) | |
896 | FD_SET(sockets[i].fd, *fdwp); | |
897 | break; | |
898 | default: | |
899 | break; | |
900 | } | |
901 | } | |
25d429a2 | 902 | deadline = reaper(); |
903 | if (parent_alive_interval != 0) | |
904 | deadline = (deadline == 0) ? parent_alive_interval : | |
905 | MIN(deadline, parent_alive_interval); | |
906 | if (deadline == 0) { | |
907 | *tvpp = NULL; | |
908 | } else { | |
909 | tv.tv_sec = deadline; | |
910 | tv.tv_usec = 0; | |
911 | *tvpp = &tv; | |
912 | } | |
3c0ef626 | 913 | return (1); |
914 | } | |
915 | ||
916 | static void | |
917 | after_select(fd_set *readset, fd_set *writeset) | |
918 | { | |
ff2d7a98 | 919 | struct sockaddr_un sunaddr; |
3c0ef626 | 920 | socklen_t slen; |
921 | char buf[1024]; | |
ff2d7a98 | 922 | int len, sock; |
923 | u_int i; | |
e54b3d7c | 924 | uid_t euid; |
925 | gid_t egid; | |
3c0ef626 | 926 | |
927 | for (i = 0; i < sockets_alloc; i++) | |
928 | switch (sockets[i].type) { | |
929 | case AUTH_UNUSED: | |
930 | break; | |
931 | case AUTH_SOCKET: | |
932 | if (FD_ISSET(sockets[i].fd, readset)) { | |
933 | slen = sizeof(sunaddr); | |
934 | sock = accept(sockets[i].fd, | |
2e437378 | 935 | (struct sockaddr *)&sunaddr, &slen); |
3c0ef626 | 936 | if (sock < 0) { |
e9a17296 | 937 | error("accept from AUTH_SOCKET: %s", |
938 | strerror(errno)); | |
3c0ef626 | 939 | break; |
940 | } | |
e54b3d7c | 941 | if (getpeereid(sock, &euid, &egid) < 0) { |
942 | error("getpeereid %d failed: %s", | |
943 | sock, strerror(errno)); | |
944 | close(sock); | |
945 | break; | |
946 | } | |
947 | if ((euid != 0) && (getuid() != euid)) { | |
948 | error("uid mismatch: " | |
949 | "peer euid %u != uid %u", | |
950 | (u_int) euid, (u_int) getuid()); | |
951 | close(sock); | |
952 | break; | |
953 | } | |
3c0ef626 | 954 | new_socket(AUTH_CONNECTION, sock); |
955 | } | |
956 | break; | |
957 | case AUTH_CONNECTION: | |
958 | if (buffer_len(&sockets[i].output) > 0 && | |
959 | FD_ISSET(sockets[i].fd, writeset)) { | |
960 | do { | |
961 | len = write(sockets[i].fd, | |
962 | buffer_ptr(&sockets[i].output), | |
963 | buffer_len(&sockets[i].output)); | |
964 | if (len == -1 && (errno == EAGAIN || | |
6f25cbdd | 965 | errno == EINTR || |
966 | errno == EWOULDBLOCK)) | |
3c0ef626 | 967 | continue; |
968 | break; | |
969 | } while (1); | |
970 | if (len <= 0) { | |
e54b3d7c | 971 | close_socket(&sockets[i]); |
3c0ef626 | 972 | break; |
973 | } | |
974 | buffer_consume(&sockets[i].output, len); | |
975 | } | |
976 | if (FD_ISSET(sockets[i].fd, readset)) { | |
977 | do { | |
978 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
979 | if (len == -1 && (errno == EAGAIN || | |
6f25cbdd | 980 | errno == EINTR || |
981 | errno == EWOULDBLOCK)) | |
3c0ef626 | 982 | continue; |
983 | break; | |
984 | } while (1); | |
985 | if (len <= 0) { | |
e54b3d7c | 986 | close_socket(&sockets[i]); |
3c0ef626 | 987 | break; |
988 | } | |
989 | buffer_append(&sockets[i].input, buf, len); | |
990 | process_message(&sockets[i]); | |
991 | } | |
992 | break; | |
993 | default: | |
994 | fatal("Unknown type %d", sockets[i].type); | |
995 | } | |
996 | } | |
997 | ||
998 | static void | |
416fd2a8 | 999 | cleanup_socket(void) |
3c0ef626 | 1000 | { |
1001 | if (socket_name[0]) | |
1002 | unlink(socket_name); | |
1003 | if (socket_dir[0]) | |
1004 | rmdir(socket_dir); | |
1005 | } | |
1006 | ||
416fd2a8 | 1007 | void |
3c0ef626 | 1008 | cleanup_exit(int i) |
1009 | { | |
416fd2a8 | 1010 | cleanup_socket(); |
1011 | _exit(i); | |
3c0ef626 | 1012 | } |
1013 | ||
2e437378 | 1014 | /*ARGSUSED*/ |
3c0ef626 | 1015 | static void |
1016 | cleanup_handler(int sig) | |
1017 | { | |
416fd2a8 | 1018 | cleanup_socket(); |
3c0ef626 | 1019 | _exit(2); |
1020 | } | |
1021 | ||
1022 | static void | |
25d429a2 | 1023 | check_parent_exists(void) |
3c0ef626 | 1024 | { |
3c0ef626 | 1025 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { |
1026 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
25d429a2 | 1027 | cleanup_socket(); |
1028 | _exit(2); | |
3c0ef626 | 1029 | } |
3c0ef626 | 1030 | } |
1031 | ||
1032 | static void | |
1033 | usage(void) | |
1034 | { | |
bd5d5d2a | 1035 | fprintf(stderr, "usage: %s [options] [command [arg ...]]\n", |
3c0ef626 | 1036 | __progname); |
1037 | fprintf(stderr, "Options:\n"); | |
1038 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
1039 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
1040 | fprintf(stderr, " -k Kill the current agent.\n"); | |
1041 | fprintf(stderr, " -d Debug mode.\n"); | |
ff2d7a98 | 1042 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
1c14df9e | 1043 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); |
3c0ef626 | 1044 | exit(1); |
1045 | } | |
1046 | ||
1047 | int | |
1048 | main(int ac, char **av) | |
1049 | { | |
1c14df9e | 1050 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; |
2278ffa1 | 1051 | int sock, fd, ch, result, saved_errno; |
1b56ff3d | 1052 | u_int nalloc; |
ff2d7a98 | 1053 | char *shell, *format, *pidstr, *agentsocket = NULL; |
1054 | fd_set *readsetp = NULL, *writesetp = NULL; | |
3c0ef626 | 1055 | struct sockaddr_un sunaddr; |
1056 | #ifdef HAVE_SETRLIMIT | |
1057 | struct rlimit rlim; | |
1058 | #endif | |
3c0ef626 | 1059 | int prev_mask; |
3c0ef626 | 1060 | extern int optind; |
ff2d7a98 | 1061 | extern char *optarg; |
1062 | pid_t pid; | |
1063 | char pidstrbuf[1 + 3 * sizeof pid]; | |
25d429a2 | 1064 | struct timeval *tvp = NULL; |
3c0ef626 | 1065 | |
e00da40d | 1066 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
1067 | sanitise_stdfd(); | |
1068 | ||
e54b3d7c | 1069 | /* drop */ |
1070 | setegid(getgid()); | |
1071 | setgid(getgid()); | |
1072 | ||
2a304a95 | 1073 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) |
1074 | /* Disable ptrace on Linux without sgid bit */ | |
1075 | prctl(PR_SET_DUMPABLE, 0); | |
1076 | #endif | |
1077 | ||
3c0ef626 | 1078 | SSLeay_add_all_algorithms(); |
1079 | ||
70791e56 | 1080 | __progname = ssh_get_progname(av[0]); |
1265699a | 1081 | init_pathnames(); |
3c0ef626 | 1082 | init_rng(); |
1083 | seed_rng(); | |
1084 | ||
1c14df9e | 1085 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { |
3c0ef626 | 1086 | switch (ch) { |
1087 | case 'c': | |
1088 | if (s_flag) | |
1089 | usage(); | |
1090 | c_flag++; | |
1091 | break; | |
1092 | case 'k': | |
1093 | k_flag++; | |
1094 | break; | |
1095 | case 's': | |
1096 | if (c_flag) | |
1097 | usage(); | |
1098 | s_flag++; | |
1099 | break; | |
1100 | case 'd': | |
1101 | if (d_flag) | |
1102 | usage(); | |
1103 | d_flag++; | |
1104 | break; | |
ff2d7a98 | 1105 | case 'a': |
1106 | agentsocket = optarg; | |
1107 | break; | |
1c14df9e | 1108 | case 't': |
1109 | if ((lifetime = convtime(optarg)) == -1) { | |
1110 | fprintf(stderr, "Invalid lifetime\n"); | |
1111 | usage(); | |
1112 | } | |
1113 | break; | |
3c0ef626 | 1114 | default: |
1115 | usage(); | |
1116 | } | |
1117 | } | |
1118 | ac -= optind; | |
1119 | av += optind; | |
1120 | ||
1121 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) | |
1122 | usage(); | |
1123 | ||
2980ea68 | 1124 | if (ac == 0 && !c_flag && !s_flag) { |
3c0ef626 | 1125 | shell = getenv("SHELL"); |
2e437378 | 1126 | if (shell != NULL && |
1127 | strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
3c0ef626 | 1128 | c_flag = 1; |
1129 | } | |
1130 | if (k_flag) { | |
2e437378 | 1131 | const char *errstr = NULL; |
1132 | ||
3c0ef626 | 1133 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
1134 | if (pidstr == NULL) { | |
1135 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
1136 | SSH_AGENTPID_ENV_NAME); | |
1137 | exit(1); | |
1138 | } | |
2e437378 | 1139 | pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); |
1140 | if (errstr) { | |
1141 | fprintf(stderr, | |
1142 | "%s=\"%s\", which is not a good PID: %s\n", | |
1143 | SSH_AGENTPID_ENV_NAME, pidstr, errstr); | |
3c0ef626 | 1144 | exit(1); |
1145 | } | |
1146 | if (kill(pid, SIGTERM) == -1) { | |
1147 | perror("kill"); | |
1148 | exit(1); | |
1149 | } | |
1150 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1151 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1152 | printf(format, SSH_AGENTPID_ENV_NAME); | |
ff2d7a98 | 1153 | printf("echo Agent pid %ld killed;\n", (long)pid); |
3c0ef626 | 1154 | exit(0); |
1155 | } | |
1156 | parent_pid = getpid(); | |
1157 | ||
ff2d7a98 | 1158 | if (agentsocket == NULL) { |
1159 | /* Create private directory for agent socket */ | |
416fd2a8 | 1160 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir); |
ff2d7a98 | 1161 | if (mkdtemp(socket_dir) == NULL) { |
1162 | perror("mkdtemp: private socket dir"); | |
1163 | exit(1); | |
1164 | } | |
1165 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, | |
1166 | (long)parent_pid); | |
1167 | } else { | |
1168 | /* Try to use specified agent socket */ | |
1169 | socket_dir[0] = '\0'; | |
1170 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
3c0ef626 | 1171 | } |
3c0ef626 | 1172 | |
1173 | /* | |
1174 | * Create socket early so it will exist before command gets run from | |
1175 | * the parent. | |
1176 | */ | |
1177 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1178 | if (sock < 0) { | |
1179 | perror("socket"); | |
34fee935 | 1180 | *socket_name = '\0'; /* Don't unlink any existing file */ |
3c0ef626 | 1181 | cleanup_exit(1); |
1182 | } | |
1183 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1184 | sunaddr.sun_family = AF_UNIX; | |
1185 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
3c0ef626 | 1186 | prev_mask = umask(0177); |
2e437378 | 1187 | if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { |
3c0ef626 | 1188 | perror("bind"); |
34fee935 | 1189 | *socket_name = '\0'; /* Don't unlink any existing file */ |
3c0ef626 | 1190 | umask(prev_mask); |
3c0ef626 | 1191 | cleanup_exit(1); |
1192 | } | |
3c0ef626 | 1193 | umask(prev_mask); |
416fd2a8 | 1194 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
3c0ef626 | 1195 | perror("listen"); |
1196 | cleanup_exit(1); | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * Fork, and have the parent execute the command, if any, or present | |
1201 | * the socket data. The child continues as the authentication agent. | |
1202 | */ | |
1203 | if (d_flag) { | |
1204 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1205 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1206 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1207 | SSH_AUTHSOCKET_ENV_NAME); | |
ff2d7a98 | 1208 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
3c0ef626 | 1209 | goto skip; |
1210 | } | |
1211 | pid = fork(); | |
1212 | if (pid == -1) { | |
1213 | perror("fork"); | |
e9a17296 | 1214 | cleanup_exit(1); |
3c0ef626 | 1215 | } |
1216 | if (pid != 0) { /* Parent - execute the given command. */ | |
1217 | close(sock); | |
ff2d7a98 | 1218 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
3c0ef626 | 1219 | if (ac == 0) { |
1220 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1221 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1222 | SSH_AUTHSOCKET_ENV_NAME); | |
1223 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, | |
1224 | SSH_AGENTPID_ENV_NAME); | |
ff2d7a98 | 1225 | printf("echo Agent pid %ld;\n", (long)pid); |
3c0ef626 | 1226 | exit(0); |
1227 | } | |
1228 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || | |
1229 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1230 | perror("setenv"); | |
1231 | exit(1); | |
1232 | } | |
1233 | execvp(av[0], av); | |
1234 | perror(av[0]); | |
1235 | exit(1); | |
1236 | } | |
e9a17296 | 1237 | /* child */ |
1238 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
3c0ef626 | 1239 | |
1240 | if (setsid() == -1) { | |
e9a17296 | 1241 | error("setsid: %s", strerror(errno)); |
3c0ef626 | 1242 | cleanup_exit(1); |
1243 | } | |
1244 | ||
1245 | (void)chdir("/"); | |
1c14df9e | 1246 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
1247 | /* XXX might close listen socket */ | |
1248 | (void)dup2(fd, STDIN_FILENO); | |
1249 | (void)dup2(fd, STDOUT_FILENO); | |
1250 | (void)dup2(fd, STDERR_FILENO); | |
1251 | if (fd > 2) | |
1252 | close(fd); | |
1253 | } | |
3c0ef626 | 1254 | |
1255 | #ifdef HAVE_SETRLIMIT | |
1256 | /* deny core dumps, since memory contains unencrypted private keys */ | |
1257 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1258 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
e9a17296 | 1259 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
3c0ef626 | 1260 | cleanup_exit(1); |
1261 | } | |
1262 | #endif | |
1263 | ||
1264 | skip: | |
3c0ef626 | 1265 | new_socket(AUTH_SOCKET, sock); |
25d429a2 | 1266 | if (ac > 0) |
1267 | parent_alive_interval = 10; | |
3c0ef626 | 1268 | idtab_init(); |
1269 | if (!d_flag) | |
1270 | signal(SIGINT, SIG_IGN); | |
1271 | signal(SIGPIPE, SIG_IGN); | |
1272 | signal(SIGHUP, cleanup_handler); | |
1273 | signal(SIGTERM, cleanup_handler); | |
1274 | nalloc = 0; | |
1275 | ||
1276 | while (1) { | |
25d429a2 | 1277 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp); |
1278 | result = select(max_fd + 1, readsetp, writesetp, NULL, tvp); | |
2278ffa1 | 1279 | saved_errno = errno; |
25d429a2 | 1280 | if (parent_alive_interval != 0) |
1281 | check_parent_exists(); | |
1282 | (void) reaper(); /* remove expired keys */ | |
2278ffa1 | 1283 | if (result < 0) { |
1284 | if (saved_errno == EINTR) | |
3c0ef626 | 1285 | continue; |
2278ffa1 | 1286 | fatal("select: %s", strerror(saved_errno)); |
1287 | } else if (result > 0) | |
1288 | after_select(readsetp, writesetp); | |
3c0ef626 | 1289 | } |
1290 | /* NOTREACHED */ | |
1291 | } |