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18660b86 | 1 | /* $OpenBSD: ssh-agent.c,v 1.157 2007/09/25 23:48:57 canacar Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
5260325f | 6 | * The authentication agent program. |
2e73a022 | 7 | * |
bcbf86ec | 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 | * | |
a96070d4 | 14 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 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. | |
5260325f | 35 | */ |
8efc0c15 | 36 | |
37 | #include "includes.h" | |
cebb4c24 | 38 | |
39 | #include <sys/types.h> | |
536c14e8 | 40 | #include <sys/param.h> |
41 | #include <sys/resource.h> | |
3e598f1a | 42 | #include <sys/stat.h> |
5b04a8bf | 43 | #include <sys/socket.h> |
e264ac72 | 44 | #ifdef HAVE_SYS_TIME_H |
45 | # include <sys/time.h> | |
46 | #endif | |
cebb4c24 | 47 | #ifdef HAVE_SYS_UN_H |
48 | # include <sys/un.h> | |
49 | #endif | |
9fd2a215 | 50 | #include "openbsd-compat/sys-queue.h" |
5b04a8bf | 51 | |
00146caa | 52 | #include <openssl/evp.h> |
53 | #include <openssl/md5.h> | |
54 | ||
028094f4 | 55 | #include <errno.h> |
d3221cca | 56 | #include <fcntl.h> |
a75f5360 | 57 | #ifdef HAVE_PATHS_H |
6f61e0ec | 58 | # include <paths.h> |
a75f5360 | 59 | #endif |
ada68823 | 60 | #include <signal.h> |
24436b92 | 61 | #include <stdarg.h> |
cf851879 | 62 | #include <stdio.h> |
ffa517a8 | 63 | #include <stdlib.h> |
b0f6943a | 64 | #include <time.h> |
00146caa | 65 | #include <string.h> |
5188ba17 | 66 | #include <unistd.h> |
ada68823 | 67 | |
31652869 | 68 | #include "xmalloc.h" |
8efc0c15 | 69 | #include "ssh.h" |
70 | #include "rsa.h" | |
8efc0c15 | 71 | #include "buffer.h" |
4c8722d9 | 72 | #include "key.h" |
73 | #include "authfd.h" | |
188adeb2 | 74 | #include "compat.h" |
42f11eb2 | 75 | #include "log.h" |
c4087616 | 76 | #include "misc.h" |
8efc0c15 | 77 | |
2b5fe3b8 | 78 | #ifdef SMARTCARD |
2b5fe3b8 | 79 | #include "scard.h" |
dd2495cb | 80 | #endif |
2b5fe3b8 | 81 | |
e7f6070d | 82 | #if defined(HAVE_SYS_PRCTL_H) |
83 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ | |
84 | #endif | |
85 | ||
17a3011c | 86 | typedef enum { |
87 | AUTH_UNUSED, | |
88 | AUTH_SOCKET, | |
89 | AUTH_CONNECTION | |
90 | } sock_type; | |
91 | ||
5260325f | 92 | typedef struct { |
93 | int fd; | |
17a3011c | 94 | sock_type type; |
5260325f | 95 | Buffer input; |
96 | Buffer output; | |
b9dd5ca1 | 97 | Buffer request; |
8efc0c15 | 98 | } SocketEntry; |
99 | ||
1e3b8b07 | 100 | u_int sockets_alloc = 0; |
8efc0c15 | 101 | SocketEntry *sockets = NULL; |
102 | ||
95f0a918 | 103 | typedef struct identity { |
104 | TAILQ_ENTRY(identity) next; | |
2e73a022 | 105 | Key *key; |
5260325f | 106 | char *comment; |
264572cc | 107 | u_int death; |
c4087616 | 108 | u_int confirm; |
8efc0c15 | 109 | } Identity; |
110 | ||
2e73a022 | 111 | typedef struct { |
112 | int nentries; | |
95f0a918 | 113 | TAILQ_HEAD(idqueue, identity) idlist; |
2e73a022 | 114 | } Idtab; |
115 | ||
116 | /* private key table, one per protocol version */ | |
117 | Idtab idtable[3]; | |
8efc0c15 | 118 | |
119 | int max_fd = 0; | |
120 | ||
121 | /* pid of shell == parent of agent */ | |
9da5c3c9 | 122 | pid_t parent_pid = -1; |
7f38e62e | 123 | u_int parent_alive_interval = 0; |
8efc0c15 | 124 | |
125 | /* pathname and directory for AUTH_SOCKET */ | |
52e3daed | 126 | char socket_name[MAXPATHLEN]; |
127 | char socket_dir[MAXPATHLEN]; | |
8efc0c15 | 128 | |
3db7f994 | 129 | /* locking */ |
130 | int locked = 0; | |
131 | char *lock_passwd = NULL; | |
132 | ||
5260325f | 133 | extern char *__progname; |
5260325f | 134 | |
494b267f | 135 | /* Default lifetime (0 == forever) */ |
136 | static int lifetime = 0; | |
137 | ||
c1a4eef1 | 138 | static void |
139 | close_socket(SocketEntry *e) | |
140 | { | |
c1a4eef1 | 141 | close(e->fd); |
142 | e->fd = -1; | |
143 | e->type = AUTH_UNUSED; | |
144 | buffer_free(&e->input); | |
145 | buffer_free(&e->output); | |
146 | buffer_free(&e->request); | |
147 | } | |
148 | ||
396c147e | 149 | static void |
2e73a022 | 150 | idtab_init(void) |
151 | { | |
152 | int i; | |
e424e241 | 153 | |
6aacefa7 | 154 | for (i = 0; i <=2; i++) { |
95f0a918 | 155 | TAILQ_INIT(&idtable[i].idlist); |
2e73a022 | 156 | idtable[i].nentries = 0; |
157 | } | |
158 | } | |
159 | ||
160 | /* return private key table for requested protocol version */ | |
396c147e | 161 | static Idtab * |
2e73a022 | 162 | idtab_lookup(int version) |
163 | { | |
164 | if (version < 1 || version > 2) | |
165 | fatal("internal error, bad protocol version %d", version); | |
166 | return &idtable[version]; | |
167 | } | |
168 | ||
264572cc | 169 | static void |
170 | free_identity(Identity *id) | |
171 | { | |
172 | key_free(id->key); | |
173 | xfree(id->comment); | |
174 | xfree(id); | |
175 | } | |
176 | ||
2e73a022 | 177 | /* return matching private key for given public key */ |
95f0a918 | 178 | static Identity * |
179 | lookup_identity(Key *key, int version) | |
2e73a022 | 180 | { |
95f0a918 | 181 | Identity *id; |
182 | ||
2e73a022 | 183 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 184 | TAILQ_FOREACH(id, &tab->idlist, next) { |
185 | if (key_equal(key, id->key)) | |
186 | return (id); | |
2e73a022 | 187 | } |
95f0a918 | 188 | return (NULL); |
189 | } | |
190 | ||
c4087616 | 191 | /* Check confirmation of keysign request */ |
192 | static int | |
193 | confirm_key(Identity *id) | |
194 | { | |
7a9c7a0b | 195 | char *p; |
c4087616 | 196 | int ret = -1; |
197 | ||
198 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
7a9c7a0b | 199 | if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", |
200 | id->comment, p)) | |
201 | ret = 0; | |
c4087616 | 202 | xfree(p); |
7a9c7a0b | 203 | |
c4087616 | 204 | return (ret); |
205 | } | |
206 | ||
2e73a022 | 207 | /* send list of supported public keys to 'client' */ |
396c147e | 208 | static void |
2e73a022 | 209 | process_request_identities(SocketEntry *e, int version) |
8efc0c15 | 210 | { |
2e73a022 | 211 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 212 | Identity *id; |
e424e241 | 213 | Buffer msg; |
5260325f | 214 | |
215 | buffer_init(&msg); | |
2e73a022 | 216 | buffer_put_char(&msg, (version == 1) ? |
217 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
218 | buffer_put_int(&msg, tab->nentries); | |
95f0a918 | 219 | TAILQ_FOREACH(id, &tab->idlist, next) { |
fa08c86b | 220 | if (id->key->type == KEY_RSA1) { |
2e73a022 | 221 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
222 | buffer_put_bignum(&msg, id->key->rsa->e); | |
223 | buffer_put_bignum(&msg, id->key->rsa->n); | |
224 | } else { | |
1e3b8b07 | 225 | u_char *blob; |
226 | u_int blen; | |
fa08c86b | 227 | key_to_blob(id->key, &blob, &blen); |
2e73a022 | 228 | buffer_put_string(&msg, blob, blen); |
229 | xfree(blob); | |
230 | } | |
231 | buffer_put_cstring(&msg, id->comment); | |
5260325f | 232 | } |
233 | buffer_put_int(&e->output, buffer_len(&msg)); | |
234 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
235 | buffer_free(&msg); | |
8efc0c15 | 236 | } |
237 | ||
2e73a022 | 238 | /* ssh1 only */ |
396c147e | 239 | static void |
2e73a022 | 240 | process_authentication_challenge1(SocketEntry *e) |
8efc0c15 | 241 | { |
e424e241 | 242 | u_char buf[32], mdbuf[16], session_id[16]; |
243 | u_int response_type; | |
2e73a022 | 244 | BIGNUM *challenge; |
e424e241 | 245 | Identity *id; |
2e73a022 | 246 | int i, len; |
5260325f | 247 | Buffer msg; |
248 | MD5_CTX md; | |
e424e241 | 249 | Key *key; |
5260325f | 250 | |
251 | buffer_init(&msg); | |
fa08c86b | 252 | key = key_new(KEY_RSA1); |
b775c6f2 | 253 | if ((challenge = BN_new()) == NULL) |
254 | fatal("process_authentication_challenge1: BN_new failed"); | |
5260325f | 255 | |
1169c3df | 256 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 257 | buffer_get_bignum(&e->request, key->rsa->e); |
258 | buffer_get_bignum(&e->request, key->rsa->n); | |
259 | buffer_get_bignum(&e->request, challenge); | |
5260325f | 260 | |
2e73a022 | 261 | /* Only protocol 1.1 is supported */ |
b9dd5ca1 | 262 | if (buffer_len(&e->request) == 0) |
2e73a022 | 263 | goto failure; |
b9dd5ca1 | 264 | buffer_get(&e->request, session_id, 16); |
265 | response_type = buffer_get_int(&e->request); | |
2e73a022 | 266 | if (response_type != 1) |
267 | goto failure; | |
268 | ||
95f0a918 | 269 | id = lookup_identity(key, 1); |
c4087616 | 270 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { |
95f0a918 | 271 | Key *private = id->key; |
2e73a022 | 272 | /* Decrypt the challenge using the private key. */ |
46aa2d1f | 273 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
274 | goto failure; | |
2e73a022 | 275 | |
276 | /* The response is MD5 of decrypted challenge plus session id. */ | |
277 | len = BN_num_bytes(challenge); | |
278 | if (len <= 0 || len > 32) { | |
bbe88b6d | 279 | logit("process_authentication_challenge: bad challenge length %d", len); |
2e73a022 | 280 | goto failure; |
5260325f | 281 | } |
2e73a022 | 282 | memset(buf, 0, 32); |
283 | BN_bn2bin(challenge, buf + 32 - len); | |
284 | MD5_Init(&md); | |
285 | MD5_Update(&md, buf, 32); | |
286 | MD5_Update(&md, session_id, 16); | |
287 | MD5_Final(mdbuf, &md); | |
288 | ||
289 | /* Send the response. */ | |
290 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
291 | for (i = 0; i < 16; i++) | |
292 | buffer_put_char(&msg, mdbuf[i]); | |
293 | goto send; | |
294 | } | |
295 | ||
296 | failure: | |
297 | /* Unknown identity or protocol error. Send failure. */ | |
5260325f | 298 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
299 | send: | |
2e73a022 | 300 | buffer_put_int(&e->output, buffer_len(&msg)); |
301 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
302 | key_free(key); | |
303 | BN_clear_free(challenge); | |
304 | buffer_free(&msg); | |
305 | } | |
306 | ||
307 | /* ssh2 only */ | |
396c147e | 308 | static void |
2e73a022 | 309 | process_sign_request2(SocketEntry *e) |
310 | { | |
1e3b8b07 | 311 | u_char *blob, *data, *signature = NULL; |
312 | u_int blen, dlen, slen = 0; | |
e424e241 | 313 | extern int datafellows; |
314 | int ok = -1, flags; | |
2e73a022 | 315 | Buffer msg; |
e424e241 | 316 | Key *key; |
2e73a022 | 317 | |
318 | datafellows = 0; | |
227e8e86 | 319 | |
b9dd5ca1 | 320 | blob = buffer_get_string(&e->request, &blen); |
321 | data = buffer_get_string(&e->request, &dlen); | |
188adeb2 | 322 | |
b9dd5ca1 | 323 | flags = buffer_get_int(&e->request); |
188adeb2 | 324 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
325 | datafellows = SSH_BUG_SIGBLOB; | |
2e73a022 | 326 | |
fa08c86b | 327 | key = key_from_blob(blob, blen); |
2e73a022 | 328 | if (key != NULL) { |
95f0a918 | 329 | Identity *id = lookup_identity(key, 2); |
c4087616 | 330 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) |
95f0a918 | 331 | ok = key_sign(id->key, &signature, &slen, data, dlen); |
2b8dc5e3 | 332 | key_free(key); |
2e73a022 | 333 | } |
2e73a022 | 334 | buffer_init(&msg); |
335 | if (ok == 0) { | |
336 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
337 | buffer_put_string(&msg, signature, slen); | |
338 | } else { | |
339 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
340 | } | |
5260325f | 341 | buffer_put_int(&e->output, buffer_len(&msg)); |
342 | buffer_append(&e->output, buffer_ptr(&msg), | |
2e73a022 | 343 | buffer_len(&msg)); |
5260325f | 344 | buffer_free(&msg); |
2e73a022 | 345 | xfree(data); |
346 | xfree(blob); | |
347 | if (signature != NULL) | |
348 | xfree(signature); | |
8efc0c15 | 349 | } |
350 | ||
2e73a022 | 351 | /* shared */ |
396c147e | 352 | static void |
2e73a022 | 353 | process_remove_identity(SocketEntry *e, int version) |
8efc0c15 | 354 | { |
e424e241 | 355 | u_int blen, bits; |
356 | int success = 0; | |
95f0a918 | 357 | Key *key = NULL; |
1e3b8b07 | 358 | u_char *blob; |
2e73a022 | 359 | |
6aacefa7 | 360 | switch (version) { |
2e73a022 | 361 | case 1: |
fa08c86b | 362 | key = key_new(KEY_RSA1); |
b9dd5ca1 | 363 | bits = buffer_get_int(&e->request); |
364 | buffer_get_bignum(&e->request, key->rsa->e); | |
365 | buffer_get_bignum(&e->request, key->rsa->n); | |
2e73a022 | 366 | |
367 | if (bits != key_size(key)) | |
bbe88b6d | 368 | logit("Warning: identity keysize mismatch: actual %u, announced %u", |
42f11eb2 | 369 | key_size(key), bits); |
2e73a022 | 370 | break; |
371 | case 2: | |
b9dd5ca1 | 372 | blob = buffer_get_string(&e->request, &blen); |
fa08c86b | 373 | key = key_from_blob(blob, blen); |
2e73a022 | 374 | xfree(blob); |
375 | break; | |
376 | } | |
377 | if (key != NULL) { | |
95f0a918 | 378 | Identity *id = lookup_identity(key, version); |
379 | if (id != NULL) { | |
aa3378df | 380 | /* |
381 | * We have this key. Free the old key. Since we | |
7b9b0103 | 382 | * don't want to leave empty slots in the middle of |
d343d900 | 383 | * the array, we actually free the key there and move |
384 | * all the entries between the empty slot and the end | |
385 | * of the array. | |
aa3378df | 386 | */ |
2e73a022 | 387 | Idtab *tab = idtab_lookup(version); |
fa08c86b | 388 | if (tab->nentries < 1) |
389 | fatal("process_remove_identity: " | |
390 | "internal error: tab->nentries %d", | |
391 | tab->nentries); | |
95f0a918 | 392 | TAILQ_REMOVE(&tab->idlist, id, next); |
393 | free_identity(id); | |
2e73a022 | 394 | tab->nentries--; |
395 | success = 1; | |
5260325f | 396 | } |
2e73a022 | 397 | key_free(key); |
398 | } | |
8efc0c15 | 399 | buffer_put_int(&e->output, 1); |
2e73a022 | 400 | buffer_put_char(&e->output, |
401 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 402 | } |
403 | ||
396c147e | 404 | static void |
2e73a022 | 405 | process_remove_all_identities(SocketEntry *e, int version) |
8efc0c15 | 406 | { |
2e73a022 | 407 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 408 | Identity *id; |
8efc0c15 | 409 | |
5260325f | 410 | /* Loop over all identities and clear the keys. */ |
95f0a918 | 411 | for (id = TAILQ_FIRST(&tab->idlist); id; |
412 | id = TAILQ_FIRST(&tab->idlist)) { | |
413 | TAILQ_REMOVE(&tab->idlist, id, next); | |
414 | free_identity(id); | |
5260325f | 415 | } |
8efc0c15 | 416 | |
5260325f | 417 | /* Mark that there are no identities. */ |
2e73a022 | 418 | tab->nentries = 0; |
8efc0c15 | 419 | |
420 | /* Send success. */ | |
421 | buffer_put_int(&e->output, 1); | |
422 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
5260325f | 423 | } |
424 | ||
7f38e62e | 425 | /* removes expired keys and returns number of seconds until the next expiry */ |
426 | static u_int | |
264572cc | 427 | reaper(void) |
428 | { | |
7f38e62e | 429 | u_int deadline = 0, now = time(NULL); |
264572cc | 430 | Identity *id, *nxt; |
431 | int version; | |
e424e241 | 432 | Idtab *tab; |
264572cc | 433 | |
434 | for (version = 1; version < 3; version++) { | |
435 | tab = idtab_lookup(version); | |
436 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
437 | nxt = TAILQ_NEXT(id, next); | |
7f38e62e | 438 | if (id->death == 0) |
439 | continue; | |
440 | if (now >= id->death) { | |
f10f9102 | 441 | debug("expiring key '%s'", id->comment); |
264572cc | 442 | TAILQ_REMOVE(&tab->idlist, id, next); |
443 | free_identity(id); | |
444 | tab->nentries--; | |
7f38e62e | 445 | } else |
446 | deadline = (deadline == 0) ? id->death : | |
447 | MIN(deadline, id->death); | |
264572cc | 448 | } |
449 | } | |
7f38e62e | 450 | if (deadline == 0 || deadline <= now) |
451 | return 0; | |
452 | else | |
453 | return (deadline - now); | |
264572cc | 454 | } |
455 | ||
396c147e | 456 | static void |
fa08c86b | 457 | process_add_identity(SocketEntry *e, int version) |
458 | { | |
2e73a022 | 459 | Idtab *tab = idtab_lookup(version); |
18660b86 | 460 | Identity *id; |
c4087616 | 461 | int type, success = 0, death = 0, confirm = 0; |
e424e241 | 462 | char *type_name, *comment; |
463 | Key *k = NULL; | |
5260325f | 464 | |
2e73a022 | 465 | switch (version) { |
466 | case 1: | |
fa08c86b | 467 | k = key_new_private(KEY_RSA1); |
1169c3df | 468 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 469 | buffer_get_bignum(&e->request, k->rsa->n); |
470 | buffer_get_bignum(&e->request, k->rsa->e); | |
471 | buffer_get_bignum(&e->request, k->rsa->d); | |
472 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
2e73a022 | 473 | |
474 | /* SSH and SSL have p and q swapped */ | |
b9dd5ca1 | 475 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
476 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
2e73a022 | 477 | |
478 | /* Generate additional parameters */ | |
2b63e803 | 479 | rsa_generate_additional_parameters(k->rsa); |
2e73a022 | 480 | break; |
481 | case 2: | |
b9dd5ca1 | 482 | type_name = buffer_get_string(&e->request, NULL); |
42f11eb2 | 483 | type = key_type_from_name(type_name); |
fa08c86b | 484 | xfree(type_name); |
6aacefa7 | 485 | switch (type) { |
fa08c86b | 486 | case KEY_DSA: |
487 | k = key_new_private(type); | |
b9dd5ca1 | 488 | buffer_get_bignum2(&e->request, k->dsa->p); |
489 | buffer_get_bignum2(&e->request, k->dsa->q); | |
490 | buffer_get_bignum2(&e->request, k->dsa->g); | |
491 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
492 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
fa08c86b | 493 | break; |
494 | case KEY_RSA: | |
495 | k = key_new_private(type); | |
b9dd5ca1 | 496 | buffer_get_bignum2(&e->request, k->rsa->n); |
497 | buffer_get_bignum2(&e->request, k->rsa->e); | |
498 | buffer_get_bignum2(&e->request, k->rsa->d); | |
499 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
500 | buffer_get_bignum2(&e->request, k->rsa->p); | |
501 | buffer_get_bignum2(&e->request, k->rsa->q); | |
fa08c86b | 502 | |
503 | /* Generate additional parameters */ | |
2b63e803 | 504 | rsa_generate_additional_parameters(k->rsa); |
fa08c86b | 505 | break; |
506 | default: | |
b9dd5ca1 | 507 | buffer_clear(&e->request); |
2e73a022 | 508 | goto send; |
5260325f | 509 | } |
2e73a022 | 510 | break; |
511 | } | |
cb0e1d67 | 512 | /* enable blinding */ |
513 | switch (k->type) { | |
514 | case KEY_RSA: | |
515 | case KEY_RSA1: | |
516 | if (RSA_blinding_on(k->rsa, NULL) != 1) { | |
517 | error("process_add_identity: RSA_blinding_on failed"); | |
518 | key_free(k); | |
519 | goto send; | |
520 | } | |
521 | break; | |
522 | } | |
b9dd5ca1 | 523 | comment = buffer_get_string(&e->request, NULL); |
2e73a022 | 524 | if (k == NULL) { |
525 | xfree(comment); | |
526 | goto send; | |
527 | } | |
528 | success = 1; | |
ee900f87 | 529 | while (buffer_len(&e->request)) { |
530 | switch (buffer_get_char(&e->request)) { | |
531 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
532 | death = time(NULL) + buffer_get_int(&e->request); | |
533 | break; | |
c4087616 | 534 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
535 | confirm = 1; | |
536 | break; | |
ee900f87 | 537 | default: |
538 | break; | |
539 | } | |
540 | } | |
494b267f | 541 | if (lifetime && !death) |
542 | death = time(NULL) + lifetime; | |
18660b86 | 543 | if ((id = lookup_identity(k, version)) == NULL) { |
544 | id = xmalloc(sizeof(Identity)); | |
95f0a918 | 545 | id->key = k; |
95f0a918 | 546 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
2e73a022 | 547 | /* Increment the number of identities. */ |
548 | tab->nentries++; | |
549 | } else { | |
550 | key_free(k); | |
18660b86 | 551 | xfree(id->comment); |
2e73a022 | 552 | } |
18660b86 | 553 | id->comment = comment; |
554 | id->death = death; | |
555 | id->confirm = confirm; | |
2e73a022 | 556 | send: |
5260325f | 557 | buffer_put_int(&e->output, 1); |
2e73a022 | 558 | buffer_put_char(&e->output, |
559 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 560 | } |
561 | ||
3db7f994 | 562 | /* XXX todo: encrypt sensitive data with passphrase */ |
563 | static void | |
564 | process_lock_agent(SocketEntry *e, int lock) | |
565 | { | |
3db7f994 | 566 | int success = 0; |
e424e241 | 567 | char *passwd; |
3db7f994 | 568 | |
569 | passwd = buffer_get_string(&e->request, NULL); | |
570 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
571 | locked = 0; | |
572 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
573 | xfree(lock_passwd); | |
574 | lock_passwd = NULL; | |
575 | success = 1; | |
576 | } else if (!locked && lock) { | |
577 | locked = 1; | |
578 | lock_passwd = xstrdup(passwd); | |
579 | success = 1; | |
580 | } | |
581 | memset(passwd, 0, strlen(passwd)); | |
582 | xfree(passwd); | |
7203d6bb | 583 | |
3db7f994 | 584 | buffer_put_int(&e->output, 1); |
585 | buffer_put_char(&e->output, | |
586 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
3db7f994 | 587 | } |
588 | ||
589 | static void | |
590 | no_identities(SocketEntry *e, u_int type) | |
591 | { | |
592 | Buffer msg; | |
593 | ||
594 | buffer_init(&msg); | |
595 | buffer_put_char(&msg, | |
596 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
597 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
598 | buffer_put_int(&msg, 0); | |
599 | buffer_put_int(&e->output, buffer_len(&msg)); | |
600 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
601 | buffer_free(&msg); | |
602 | } | |
2b5fe3b8 | 603 | |
604 | #ifdef SMARTCARD | |
605 | static void | |
606 | process_add_smartcard_key (SocketEntry *e) | |
607 | { | |
76139bd8 | 608 | char *sc_reader_id = NULL, *pin; |
ca719034 | 609 | int i, version, success = 0, death = 0, confirm = 0; |
e424e241 | 610 | Key **keys, *k; |
611 | Identity *id; | |
612 | Idtab *tab; | |
184eed6a | 613 | |
b9dd5ca1 | 614 | sc_reader_id = buffer_get_string(&e->request, NULL); |
615 | pin = buffer_get_string(&e->request, NULL); | |
ca719034 | 616 | |
617 | while (buffer_len(&e->request)) { | |
618 | switch (buffer_get_char(&e->request)) { | |
619 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
620 | death = time(NULL) + buffer_get_int(&e->request); | |
621 | break; | |
622 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
623 | confirm = 1; | |
624 | break; | |
625 | default: | |
626 | break; | |
627 | } | |
628 | } | |
629 | if (lifetime && !death) | |
630 | death = time(NULL) + lifetime; | |
631 | ||
0659cace | 632 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 633 | xfree(sc_reader_id); |
76139bd8 | 634 | xfree(pin); |
2b5fe3b8 | 635 | |
0659cace | 636 | if (keys == NULL || keys[0] == NULL) { |
637 | error("sc_get_keys failed"); | |
2b5fe3b8 | 638 | goto send; |
639 | } | |
0659cace | 640 | for (i = 0; keys[i] != NULL; i++) { |
641 | k = keys[i]; | |
642 | version = k->type == KEY_RSA1 ? 1 : 2; | |
643 | tab = idtab_lookup(version); | |
644 | if (lookup_identity(k, version) == NULL) { | |
645 | id = xmalloc(sizeof(Identity)); | |
646 | id->key = k; | |
244e796f | 647 | id->comment = sc_get_key_label(k); |
ca719034 | 648 | id->death = death; |
649 | id->confirm = confirm; | |
0659cace | 650 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
651 | tab->nentries++; | |
652 | success = 1; | |
653 | } else { | |
654 | key_free(k); | |
655 | } | |
656 | keys[i] = NULL; | |
2b5fe3b8 | 657 | } |
0659cace | 658 | xfree(keys); |
2b5fe3b8 | 659 | send: |
660 | buffer_put_int(&e->output, 1); | |
661 | buffer_put_char(&e->output, | |
662 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
663 | } | |
664 | ||
665 | static void | |
666 | process_remove_smartcard_key(SocketEntry *e) | |
667 | { | |
76139bd8 | 668 | char *sc_reader_id = NULL, *pin; |
0659cace | 669 | int i, version, success = 0; |
e424e241 | 670 | Key **keys, *k = NULL; |
671 | Identity *id; | |
672 | Idtab *tab; | |
2b5fe3b8 | 673 | |
b9dd5ca1 | 674 | sc_reader_id = buffer_get_string(&e->request, NULL); |
675 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 676 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 677 | xfree(sc_reader_id); |
76139bd8 | 678 | xfree(pin); |
2b5fe3b8 | 679 | |
0659cace | 680 | if (keys == NULL || keys[0] == NULL) { |
681 | error("sc_get_keys failed"); | |
682 | goto send; | |
683 | } | |
684 | for (i = 0; keys[i] != NULL; i++) { | |
685 | k = keys[i]; | |
686 | version = k->type == KEY_RSA1 ? 1 : 2; | |
687 | if ((id = lookup_identity(k, version)) != NULL) { | |
688 | tab = idtab_lookup(version); | |
875ec275 | 689 | TAILQ_REMOVE(&tab->idlist, id, next); |
2b5fe3b8 | 690 | tab->nentries--; |
95f0a918 | 691 | free_identity(id); |
2b5fe3b8 | 692 | success = 1; |
693 | } | |
694 | key_free(k); | |
0659cace | 695 | keys[i] = NULL; |
2b5fe3b8 | 696 | } |
0659cace | 697 | xfree(keys); |
698 | send: | |
2b5fe3b8 | 699 | buffer_put_int(&e->output, 1); |
700 | buffer_put_char(&e->output, | |
701 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
702 | } | |
3e984472 | 703 | #endif /* SMARTCARD */ |
2b5fe3b8 | 704 | |
2e73a022 | 705 | /* dispatch incoming messages */ |
706 | ||
396c147e | 707 | static void |
8efc0c15 | 708 | process_message(SocketEntry *e) |
709 | { | |
e424e241 | 710 | u_int msg_len, type; |
1e3b8b07 | 711 | u_char *cp; |
264572cc | 712 | |
5260325f | 713 | if (buffer_len(&e->input) < 5) |
714 | return; /* Incomplete message. */ | |
20905a8e | 715 | cp = buffer_ptr(&e->input); |
51e7a012 | 716 | msg_len = get_u32(cp); |
5260325f | 717 | if (msg_len > 256 * 1024) { |
c1a4eef1 | 718 | close_socket(e); |
5260325f | 719 | return; |
720 | } | |
721 | if (buffer_len(&e->input) < msg_len + 4) | |
722 | return; | |
b9dd5ca1 | 723 | |
724 | /* move the current input to e->request */ | |
5260325f | 725 | buffer_consume(&e->input, 4); |
b9dd5ca1 | 726 | buffer_clear(&e->request); |
727 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
728 | buffer_consume(&e->input, msg_len); | |
729 | type = buffer_get_char(&e->request); | |
5260325f | 730 | |
3db7f994 | 731 | /* check wheter agent is locked */ |
732 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
733 | buffer_clear(&e->request); | |
734 | switch (type) { | |
735 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
736 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
737 | /* send empty lists */ | |
738 | no_identities(e, type); | |
739 | break; | |
740 | default: | |
741 | /* send a fail message for all other request types */ | |
742 | buffer_put_int(&e->output, 1); | |
743 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
744 | } | |
745 | return; | |
746 | } | |
747 | ||
2b5fe3b8 | 748 | debug("type %d", type); |
5260325f | 749 | switch (type) { |
3db7f994 | 750 | case SSH_AGENTC_LOCK: |
751 | case SSH_AGENTC_UNLOCK: | |
752 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
753 | break; | |
2e73a022 | 754 | /* ssh1 */ |
5260325f | 755 | case SSH_AGENTC_RSA_CHALLENGE: |
2e73a022 | 756 | process_authentication_challenge1(e); |
757 | break; | |
758 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
759 | process_request_identities(e, 1); | |
5260325f | 760 | break; |
761 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
ee900f87 | 762 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
2e73a022 | 763 | process_add_identity(e, 1); |
5260325f | 764 | break; |
765 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
2e73a022 | 766 | process_remove_identity(e, 1); |
5260325f | 767 | break; |
768 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
2e73a022 | 769 | process_remove_all_identities(e, 1); |
770 | break; | |
771 | /* ssh2 */ | |
772 | case SSH2_AGENTC_SIGN_REQUEST: | |
773 | process_sign_request2(e); | |
774 | break; | |
775 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
776 | process_request_identities(e, 2); | |
777 | break; | |
778 | case SSH2_AGENTC_ADD_IDENTITY: | |
ee900f87 | 779 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
2e73a022 | 780 | process_add_identity(e, 2); |
781 | break; | |
782 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
783 | process_remove_identity(e, 2); | |
784 | break; | |
785 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
786 | process_remove_all_identities(e, 2); | |
5260325f | 787 | break; |
2b5fe3b8 | 788 | #ifdef SMARTCARD |
789 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
ca719034 | 790 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: |
2b5fe3b8 | 791 | process_add_smartcard_key(e); |
184eed6a | 792 | break; |
2b5fe3b8 | 793 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
794 | process_remove_smartcard_key(e); | |
184eed6a | 795 | break; |
3e984472 | 796 | #endif /* SMARTCARD */ |
5260325f | 797 | default: |
798 | /* Unknown message. Respond with failure. */ | |
799 | error("Unknown message %d", type); | |
b9dd5ca1 | 800 | buffer_clear(&e->request); |
5260325f | 801 | buffer_put_int(&e->output, 1); |
802 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
803 | break; | |
804 | } | |
8efc0c15 | 805 | } |
806 | ||
396c147e | 807 | static void |
17a3011c | 808 | new_socket(sock_type type, int fd) |
8efc0c15 | 809 | { |
c46e584f | 810 | u_int i, old_alloc, new_alloc; |
e424e241 | 811 | |
170694d7 | 812 | set_nonblock(fd); |
5260325f | 813 | |
814 | if (fd > max_fd) | |
815 | max_fd = fd; | |
816 | ||
817 | for (i = 0; i < sockets_alloc; i++) | |
818 | if (sockets[i].type == AUTH_UNUSED) { | |
819 | sockets[i].fd = fd; | |
5260325f | 820 | buffer_init(&sockets[i].input); |
821 | buffer_init(&sockets[i].output); | |
b9dd5ca1 | 822 | buffer_init(&sockets[i].request); |
c46e584f | 823 | sockets[i].type = type; |
5260325f | 824 | return; |
825 | } | |
826 | old_alloc = sockets_alloc; | |
c46e584f | 827 | new_alloc = sockets_alloc + 10; |
c5d10563 | 828 | sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); |
c46e584f | 829 | for (i = old_alloc; i < new_alloc; i++) |
5260325f | 830 | sockets[i].type = AUTH_UNUSED; |
c46e584f | 831 | sockets_alloc = new_alloc; |
5260325f | 832 | sockets[old_alloc].fd = fd; |
833 | buffer_init(&sockets[old_alloc].input); | |
834 | buffer_init(&sockets[old_alloc].output); | |
b9dd5ca1 | 835 | buffer_init(&sockets[old_alloc].request); |
c46e584f | 836 | sockets[old_alloc].type = type; |
8efc0c15 | 837 | } |
838 | ||
396c147e | 839 | static int |
7f38e62e | 840 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp, |
841 | struct timeval **tvpp) | |
8efc0c15 | 842 | { |
7f38e62e | 843 | u_int i, sz, deadline; |
42f11eb2 | 844 | int n = 0; |
7f38e62e | 845 | static struct timeval tv; |
42f11eb2 | 846 | |
847 | for (i = 0; i < sockets_alloc; i++) { | |
5260325f | 848 | switch (sockets[i].type) { |
849 | case AUTH_SOCKET: | |
850 | case AUTH_CONNECTION: | |
42f11eb2 | 851 | n = MAX(n, sockets[i].fd); |
5260325f | 852 | break; |
853 | case AUTH_UNUSED: | |
854 | break; | |
855 | default: | |
856 | fatal("Unknown socket type %d", sockets[i].type); | |
857 | break; | |
858 | } | |
42f11eb2 | 859 | } |
860 | ||
861 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
e364646f | 862 | if (*fdrp == NULL || sz > *nallocp) { |
42f11eb2 | 863 | if (*fdrp) |
894c5fa6 | 864 | xfree(*fdrp); |
42f11eb2 | 865 | if (*fdwp) |
894c5fa6 | 866 | xfree(*fdwp); |
42f11eb2 | 867 | *fdrp = xmalloc(sz); |
868 | *fdwp = xmalloc(sz); | |
e364646f | 869 | *nallocp = sz; |
42f11eb2 | 870 | } |
e364646f | 871 | if (n < *fdl) |
872 | debug("XXX shrink: %d < %d", n, *fdl); | |
873 | *fdl = n; | |
42f11eb2 | 874 | memset(*fdrp, 0, sz); |
875 | memset(*fdwp, 0, sz); | |
876 | ||
877 | for (i = 0; i < sockets_alloc; i++) { | |
878 | switch (sockets[i].type) { | |
879 | case AUTH_SOCKET: | |
880 | case AUTH_CONNECTION: | |
881 | FD_SET(sockets[i].fd, *fdrp); | |
882 | if (buffer_len(&sockets[i].output) > 0) | |
883 | FD_SET(sockets[i].fd, *fdwp); | |
884 | break; | |
885 | default: | |
886 | break; | |
887 | } | |
888 | } | |
7f38e62e | 889 | deadline = reaper(); |
890 | if (parent_alive_interval != 0) | |
891 | deadline = (deadline == 0) ? parent_alive_interval : | |
892 | MIN(deadline, parent_alive_interval); | |
893 | if (deadline == 0) { | |
894 | *tvpp = NULL; | |
895 | } else { | |
896 | tv.tv_sec = deadline; | |
897 | tv.tv_usec = 0; | |
898 | *tvpp = &tv; | |
899 | } | |
42f11eb2 | 900 | return (1); |
8efc0c15 | 901 | } |
902 | ||
396c147e | 903 | static void |
5260325f | 904 | after_select(fd_set *readset, fd_set *writeset) |
8efc0c15 | 905 | { |
e424e241 | 906 | struct sockaddr_un sunaddr; |
610cd5c6 | 907 | socklen_t slen; |
5260325f | 908 | char buf[1024]; |
e424e241 | 909 | int len, sock; |
910 | u_int i; | |
87f4111f | 911 | uid_t euid; |
912 | gid_t egid; | |
5260325f | 913 | |
914 | for (i = 0; i < sockets_alloc; i++) | |
915 | switch (sockets[i].type) { | |
916 | case AUTH_UNUSED: | |
917 | break; | |
918 | case AUTH_SOCKET: | |
919 | if (FD_ISSET(sockets[i].fd, readset)) { | |
610cd5c6 | 920 | slen = sizeof(sunaddr); |
42f11eb2 | 921 | sock = accept(sockets[i].fd, |
32596c7b | 922 | (struct sockaddr *)&sunaddr, &slen); |
5260325f | 923 | if (sock < 0) { |
fccfbe3b | 924 | error("accept from AUTH_SOCKET: %s", |
925 | strerror(errno)); | |
5260325f | 926 | break; |
927 | } | |
87f4111f | 928 | if (getpeereid(sock, &euid, &egid) < 0) { |
929 | error("getpeereid %d failed: %s", | |
930 | sock, strerror(errno)); | |
931 | close(sock); | |
932 | break; | |
933 | } | |
e139021d | 934 | if ((euid != 0) && (getuid() != euid)) { |
87f4111f | 935 | error("uid mismatch: " |
792e7d2d | 936 | "peer euid %u != uid %u", |
937 | (u_int) euid, (u_int) getuid()); | |
87f4111f | 938 | close(sock); |
939 | break; | |
940 | } | |
5260325f | 941 | new_socket(AUTH_CONNECTION, sock); |
942 | } | |
943 | break; | |
944 | case AUTH_CONNECTION: | |
945 | if (buffer_len(&sockets[i].output) > 0 && | |
946 | FD_ISSET(sockets[i].fd, writeset)) { | |
bbc62e59 | 947 | do { |
948 | len = write(sockets[i].fd, | |
949 | buffer_ptr(&sockets[i].output), | |
950 | buffer_len(&sockets[i].output)); | |
951 | if (len == -1 && (errno == EAGAIN || | |
952 | errno == EINTR)) | |
953 | continue; | |
954 | break; | |
955 | } while (1); | |
5260325f | 956 | if (len <= 0) { |
c1a4eef1 | 957 | close_socket(&sockets[i]); |
5260325f | 958 | break; |
959 | } | |
960 | buffer_consume(&sockets[i].output, len); | |
961 | } | |
962 | if (FD_ISSET(sockets[i].fd, readset)) { | |
bbc62e59 | 963 | do { |
964 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
965 | if (len == -1 && (errno == EAGAIN || | |
966 | errno == EINTR)) | |
967 | continue; | |
968 | break; | |
969 | } while (1); | |
5260325f | 970 | if (len <= 0) { |
c1a4eef1 | 971 | close_socket(&sockets[i]); |
5260325f | 972 | break; |
973 | } | |
974 | buffer_append(&sockets[i].input, buf, len); | |
975 | process_message(&sockets[i]); | |
976 | } | |
977 | break; | |
978 | default: | |
979 | fatal("Unknown type %d", sockets[i].type); | |
980 | } | |
8efc0c15 | 981 | } |
982 | ||
396c147e | 983 | static void |
cd25664d | 984 | cleanup_socket(void) |
dae3fa13 | 985 | { |
2f4b2e38 | 986 | if (socket_name[0]) |
987 | unlink(socket_name); | |
988 | if (socket_dir[0]) | |
989 | rmdir(socket_dir); | |
8efc0c15 | 990 | } |
991 | ||
2362db19 | 992 | void |
dae3fa13 | 993 | cleanup_exit(int i) |
994 | { | |
cd25664d | 995 | cleanup_socket(); |
996 | _exit(i); | |
dae3fa13 | 997 | } |
998 | ||
8d0b0353 | 999 | /*ARGSUSED*/ |
396c147e | 1000 | static void |
2f4b2e38 | 1001 | cleanup_handler(int sig) |
1002 | { | |
cd25664d | 1003 | cleanup_socket(); |
2f4b2e38 | 1004 | _exit(2); |
1005 | } | |
1006 | ||
7efa8482 | 1007 | static void |
7f38e62e | 1008 | check_parent_exists(void) |
7efa8482 | 1009 | { |
7efa8482 | 1010 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { |
1011 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
7f38e62e | 1012 | cleanup_socket(); |
1013 | _exit(2); | |
7efa8482 | 1014 | } |
7efa8482 | 1015 | } |
1016 | ||
396c147e | 1017 | static void |
cc8aca8a | 1018 | usage(void) |
dae3fa13 | 1019 | { |
269cfc8a | 1020 | fprintf(stderr, "usage: %s [options] [command [arg ...]]\n", |
0e3c1f95 | 1021 | __progname); |
33e766d2 | 1022 | fprintf(stderr, "Options:\n"); |
1023 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
1024 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
1025 | fprintf(stderr, " -k Kill the current agent.\n"); | |
1026 | fprintf(stderr, " -d Debug mode.\n"); | |
3e7efb37 | 1027 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
494b267f | 1028 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); |
5260325f | 1029 | exit(1); |
dae3fa13 | 1030 | } |
1031 | ||
8efc0c15 | 1032 | int |
1033 | main(int ac, char **av) | |
1034 | { | |
c4087616 | 1035 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; |
f10f9102 | 1036 | int sock, fd, ch, result, saved_errno; |
9a995072 | 1037 | u_int nalloc; |
e424e241 | 1038 | char *shell, *format, *pidstr, *agentsocket = NULL; |
1039 | fd_set *readsetp = NULL, *writesetp = NULL; | |
5260325f | 1040 | struct sockaddr_un sunaddr; |
b03bd394 | 1041 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1042 | struct rlimit rlim; |
c7ccfd39 | 1043 | #endif |
c7ccfd39 | 1044 | int prev_mask; |
c04f75f1 | 1045 | extern int optind; |
ef3912be | 1046 | extern char *optarg; |
e424e241 | 1047 | pid_t pid; |
1048 | char pidstrbuf[1 + 3 * sizeof pid]; | |
7f38e62e | 1049 | struct timeval *tvp = NULL; |
fcb975eb | 1050 | |
fd6168c1 | 1051 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
1052 | sanitise_stdfd(); | |
1053 | ||
954640a4 | 1054 | /* drop */ |
1055 | setegid(getgid()); | |
1056 | setgid(getgid()); | |
1057 | ||
e7f6070d | 1058 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) |
1059 | /* Disable ptrace on Linux without sgid bit */ | |
1060 | prctl(PR_SET_DUMPABLE, 0); | |
1061 | #endif | |
1062 | ||
457fc0c6 | 1063 | SSLeay_add_all_algorithms(); |
1064 | ||
fda04d7d | 1065 | __progname = ssh_get_progname(av[0]); |
264dce47 | 1066 | init_rng(); |
e339aa53 | 1067 | seed_rng(); |
2b87da3b | 1068 | |
494b267f | 1069 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { |
5260325f | 1070 | switch (ch) { |
1071 | case 'c': | |
1072 | if (s_flag) | |
1073 | usage(); | |
1074 | c_flag++; | |
1075 | break; | |
1076 | case 'k': | |
1077 | k_flag++; | |
1078 | break; | |
1079 | case 's': | |
1080 | if (c_flag) | |
1081 | usage(); | |
1082 | s_flag++; | |
1083 | break; | |
ffdb5d70 | 1084 | case 'd': |
1085 | if (d_flag) | |
1086 | usage(); | |
1087 | d_flag++; | |
1088 | break; | |
3e7efb37 | 1089 | case 'a': |
1090 | agentsocket = optarg; | |
1091 | break; | |
494b267f | 1092 | case 't': |
1093 | if ((lifetime = convtime(optarg)) == -1) { | |
1094 | fprintf(stderr, "Invalid lifetime\n"); | |
1095 | usage(); | |
1096 | } | |
1097 | break; | |
5260325f | 1098 | default: |
1099 | usage(); | |
1100 | } | |
dae3fa13 | 1101 | } |
5260325f | 1102 | ac -= optind; |
1103 | av += optind; | |
1104 | ||
ffdb5d70 | 1105 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
5260325f | 1106 | usage(); |
1107 | ||
b745a2f2 | 1108 | if (ac == 0 && !c_flag && !s_flag) { |
5260325f | 1109 | shell = getenv("SHELL"); |
cfaa5405 | 1110 | if (shell != NULL && |
1111 | strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
5260325f | 1112 | c_flag = 1; |
dae3fa13 | 1113 | } |
5260325f | 1114 | if (k_flag) { |
cfaa5405 | 1115 | const char *errstr = NULL; |
1116 | ||
5260325f | 1117 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
1118 | if (pidstr == NULL) { | |
1119 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
42f11eb2 | 1120 | SSH_AGENTPID_ENV_NAME); |
5260325f | 1121 | exit(1); |
1122 | } | |
cfaa5405 | 1123 | pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); |
1124 | if (errstr) { | |
1125 | fprintf(stderr, | |
1126 | "%s=\"%s\", which is not a good PID: %s\n", | |
1127 | SSH_AGENTPID_ENV_NAME, pidstr, errstr); | |
5260325f | 1128 | exit(1); |
1129 | } | |
1130 | if (kill(pid, SIGTERM) == -1) { | |
1131 | perror("kill"); | |
1132 | exit(1); | |
1133 | } | |
1134 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1135 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1136 | printf(format, SSH_AGENTPID_ENV_NAME); | |
c457707e | 1137 | printf("echo Agent pid %ld killed;\n", (long)pid); |
5260325f | 1138 | exit(0); |
dae3fa13 | 1139 | } |
5260325f | 1140 | parent_pid = getpid(); |
1141 | ||
3e7efb37 | 1142 | if (agentsocket == NULL) { |
1143 | /* Create private directory for agent socket */ | |
c88de854 | 1144 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir); |
3e7efb37 | 1145 | if (mkdtemp(socket_dir) == NULL) { |
1146 | perror("mkdtemp: private socket dir"); | |
1147 | exit(1); | |
1148 | } | |
c457707e | 1149 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
1150 | (long)parent_pid); | |
3e7efb37 | 1151 | } else { |
1152 | /* Try to use specified agent socket */ | |
1153 | socket_dir[0] = '\0'; | |
1154 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
5260325f | 1155 | } |
5260325f | 1156 | |
aa3378df | 1157 | /* |
1158 | * Create socket early so it will exist before command gets run from | |
1159 | * the parent. | |
1160 | */ | |
5260325f | 1161 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
1162 | if (sock < 0) { | |
1163 | perror("socket"); | |
8e8d8c82 | 1164 | *socket_name = '\0'; /* Don't unlink any existing file */ |
5260325f | 1165 | cleanup_exit(1); |
1166 | } | |
1167 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1168 | sunaddr.sun_family = AF_UNIX; | |
1169 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
c7ccfd39 | 1170 | prev_mask = umask(0177); |
32596c7b | 1171 | if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { |
5260325f | 1172 | perror("bind"); |
8e8d8c82 | 1173 | *socket_name = '\0'; /* Don't unlink any existing file */ |
c7ccfd39 | 1174 | umask(prev_mask); |
5260325f | 1175 | cleanup_exit(1); |
1176 | } | |
c7ccfd39 | 1177 | umask(prev_mask); |
fce39749 | 1178 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
5260325f | 1179 | perror("listen"); |
1180 | cleanup_exit(1); | |
dae3fa13 | 1181 | } |
42f11eb2 | 1182 | |
aa3378df | 1183 | /* |
1184 | * Fork, and have the parent execute the command, if any, or present | |
1185 | * the socket data. The child continues as the authentication agent. | |
1186 | */ | |
ffdb5d70 | 1187 | if (d_flag) { |
1188 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1189 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1190 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1191 | SSH_AUTHSOCKET_ENV_NAME); | |
c457707e | 1192 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
ffdb5d70 | 1193 | goto skip; |
1194 | } | |
5260325f | 1195 | pid = fork(); |
1196 | if (pid == -1) { | |
1197 | perror("fork"); | |
fccfbe3b | 1198 | cleanup_exit(1); |
dae3fa13 | 1199 | } |
5260325f | 1200 | if (pid != 0) { /* Parent - execute the given command. */ |
1201 | close(sock); | |
c457707e | 1202 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
5260325f | 1203 | if (ac == 0) { |
1204 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1205 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
42f11eb2 | 1206 | SSH_AUTHSOCKET_ENV_NAME); |
5260325f | 1207 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
42f11eb2 | 1208 | SSH_AGENTPID_ENV_NAME); |
c457707e | 1209 | printf("echo Agent pid %ld;\n", (long)pid); |
5260325f | 1210 | exit(0); |
1211 | } | |
bcbf86ec | 1212 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
1213 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1214 | perror("setenv"); | |
1215 | exit(1); | |
1216 | } | |
5260325f | 1217 | execvp(av[0], av); |
1218 | perror(av[0]); | |
1219 | exit(1); | |
1220 | } | |
fccfbe3b | 1221 | /* child */ |
1222 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
ec9f3450 | 1223 | |
1224 | if (setsid() == -1) { | |
fccfbe3b | 1225 | error("setsid: %s", strerror(errno)); |
ec9f3450 | 1226 | cleanup_exit(1); |
1227 | } | |
1228 | ||
1229 | (void)chdir("/"); | |
c4087616 | 1230 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
1231 | /* XXX might close listen socket */ | |
1232 | (void)dup2(fd, STDIN_FILENO); | |
1233 | (void)dup2(fd, STDOUT_FILENO); | |
1234 | (void)dup2(fd, STDERR_FILENO); | |
1235 | if (fd > 2) | |
1236 | close(fd); | |
1237 | } | |
dae3fa13 | 1238 | |
b03bd394 | 1239 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1240 | /* deny core dumps, since memory contains unencrypted private keys */ |
1241 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1242 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
fccfbe3b | 1243 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
0b6fbf03 | 1244 | cleanup_exit(1); |
1245 | } | |
b03bd394 | 1246 | #endif |
ffdb5d70 | 1247 | |
1248 | skip: | |
5260325f | 1249 | new_socket(AUTH_SOCKET, sock); |
7f38e62e | 1250 | if (ac > 0) |
1251 | parent_alive_interval = 10; | |
2e73a022 | 1252 | idtab_init(); |
1ee482c5 | 1253 | if (!d_flag) |
ffdb5d70 | 1254 | signal(SIGINT, SIG_IGN); |
1ee482c5 | 1255 | signal(SIGPIPE, SIG_IGN); |
2f4b2e38 | 1256 | signal(SIGHUP, cleanup_handler); |
1257 | signal(SIGTERM, cleanup_handler); | |
e364646f | 1258 | nalloc = 0; |
1259 | ||
5260325f | 1260 | while (1) { |
7f38e62e | 1261 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp); |
1262 | result = select(max_fd + 1, readsetp, writesetp, NULL, tvp); | |
f10f9102 | 1263 | saved_errno = errno; |
7f38e62e | 1264 | if (parent_alive_interval != 0) |
1265 | check_parent_exists(); | |
1266 | (void) reaper(); /* remove expired keys */ | |
f10f9102 | 1267 | if (result < 0) { |
1268 | if (saved_errno == EINTR) | |
5260325f | 1269 | continue; |
f10f9102 | 1270 | fatal("select: %s", strerror(saved_errno)); |
1271 | } else if (result > 0) | |
1272 | after_select(readsetp, writesetp); | |
8efc0c15 | 1273 | } |
5260325f | 1274 | /* NOTREACHED */ |
8efc0c15 | 1275 | } |