]>
Commit | Line | Data |
---|---|---|
5561856d | 1 | /* $OpenBSD: ssh-agent.c,v 1.162 2009/09/01 14:43:17 djm 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> | |
f5f25d17 | 54 | #include "openbsd-compat/openssl-compat.h" |
00146caa | 55 | |
028094f4 | 56 | #include <errno.h> |
d3221cca | 57 | #include <fcntl.h> |
a75f5360 | 58 | #ifdef HAVE_PATHS_H |
6f61e0ec | 59 | # include <paths.h> |
a75f5360 | 60 | #endif |
ada68823 | 61 | #include <signal.h> |
24436b92 | 62 | #include <stdarg.h> |
cf851879 | 63 | #include <stdio.h> |
ffa517a8 | 64 | #include <stdlib.h> |
b0f6943a | 65 | #include <time.h> |
00146caa | 66 | #include <string.h> |
5188ba17 | 67 | #include <unistd.h> |
ada68823 | 68 | |
31652869 | 69 | #include "xmalloc.h" |
8efc0c15 | 70 | #include "ssh.h" |
71 | #include "rsa.h" | |
8efc0c15 | 72 | #include "buffer.h" |
4c8722d9 | 73 | #include "key.h" |
74 | #include "authfd.h" | |
188adeb2 | 75 | #include "compat.h" |
42f11eb2 | 76 | #include "log.h" |
c4087616 | 77 | #include "misc.h" |
8efc0c15 | 78 | |
2b5fe3b8 | 79 | #ifdef SMARTCARD |
2b5fe3b8 | 80 | #include "scard.h" |
dd2495cb | 81 | #endif |
2b5fe3b8 | 82 | |
e7f6070d | 83 | #if defined(HAVE_SYS_PRCTL_H) |
84 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ | |
85 | #endif | |
86 | ||
17a3011c | 87 | typedef enum { |
88 | AUTH_UNUSED, | |
89 | AUTH_SOCKET, | |
90 | AUTH_CONNECTION | |
91 | } sock_type; | |
92 | ||
5260325f | 93 | typedef struct { |
94 | int fd; | |
17a3011c | 95 | sock_type type; |
5260325f | 96 | Buffer input; |
97 | Buffer output; | |
b9dd5ca1 | 98 | Buffer request; |
8efc0c15 | 99 | } SocketEntry; |
100 | ||
1e3b8b07 | 101 | u_int sockets_alloc = 0; |
8efc0c15 | 102 | SocketEntry *sockets = NULL; |
103 | ||
95f0a918 | 104 | typedef struct identity { |
105 | TAILQ_ENTRY(identity) next; | |
2e73a022 | 106 | Key *key; |
5260325f | 107 | char *comment; |
264572cc | 108 | u_int death; |
c4087616 | 109 | u_int confirm; |
8efc0c15 | 110 | } Identity; |
111 | ||
2e73a022 | 112 | typedef struct { |
113 | int nentries; | |
95f0a918 | 114 | TAILQ_HEAD(idqueue, identity) idlist; |
2e73a022 | 115 | } Idtab; |
116 | ||
117 | /* private key table, one per protocol version */ | |
118 | Idtab idtable[3]; | |
8efc0c15 | 119 | |
120 | int max_fd = 0; | |
121 | ||
122 | /* pid of shell == parent of agent */ | |
9da5c3c9 | 123 | pid_t parent_pid = -1; |
7f38e62e | 124 | u_int parent_alive_interval = 0; |
8efc0c15 | 125 | |
126 | /* pathname and directory for AUTH_SOCKET */ | |
52e3daed | 127 | char socket_name[MAXPATHLEN]; |
128 | char socket_dir[MAXPATHLEN]; | |
8efc0c15 | 129 | |
3db7f994 | 130 | /* locking */ |
131 | int locked = 0; | |
132 | char *lock_passwd = NULL; | |
133 | ||
5260325f | 134 | extern char *__progname; |
5260325f | 135 | |
494b267f | 136 | /* Default lifetime (0 == forever) */ |
137 | static int lifetime = 0; | |
138 | ||
c1a4eef1 | 139 | static void |
140 | close_socket(SocketEntry *e) | |
141 | { | |
c1a4eef1 | 142 | close(e->fd); |
143 | e->fd = -1; | |
144 | e->type = AUTH_UNUSED; | |
145 | buffer_free(&e->input); | |
146 | buffer_free(&e->output); | |
147 | buffer_free(&e->request); | |
148 | } | |
149 | ||
396c147e | 150 | static void |
2e73a022 | 151 | idtab_init(void) |
152 | { | |
153 | int i; | |
e424e241 | 154 | |
6aacefa7 | 155 | for (i = 0; i <=2; i++) { |
95f0a918 | 156 | TAILQ_INIT(&idtable[i].idlist); |
2e73a022 | 157 | idtable[i].nentries = 0; |
158 | } | |
159 | } | |
160 | ||
161 | /* return private key table for requested protocol version */ | |
396c147e | 162 | static Idtab * |
2e73a022 | 163 | idtab_lookup(int version) |
164 | { | |
165 | if (version < 1 || version > 2) | |
166 | fatal("internal error, bad protocol version %d", version); | |
167 | return &idtable[version]; | |
168 | } | |
169 | ||
264572cc | 170 | static void |
171 | free_identity(Identity *id) | |
172 | { | |
173 | key_free(id->key); | |
174 | xfree(id->comment); | |
175 | xfree(id); | |
176 | } | |
177 | ||
2e73a022 | 178 | /* return matching private key for given public key */ |
95f0a918 | 179 | static Identity * |
180 | lookup_identity(Key *key, int version) | |
2e73a022 | 181 | { |
95f0a918 | 182 | Identity *id; |
183 | ||
2e73a022 | 184 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 185 | TAILQ_FOREACH(id, &tab->idlist, next) { |
186 | if (key_equal(key, id->key)) | |
187 | return (id); | |
2e73a022 | 188 | } |
95f0a918 | 189 | return (NULL); |
190 | } | |
191 | ||
c4087616 | 192 | /* Check confirmation of keysign request */ |
193 | static int | |
194 | confirm_key(Identity *id) | |
195 | { | |
7a9c7a0b | 196 | char *p; |
c4087616 | 197 | int ret = -1; |
198 | ||
199 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
7a9c7a0b | 200 | if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", |
201 | id->comment, p)) | |
202 | ret = 0; | |
c4087616 | 203 | xfree(p); |
7a9c7a0b | 204 | |
c4087616 | 205 | return (ret); |
206 | } | |
207 | ||
2e73a022 | 208 | /* send list of supported public keys to 'client' */ |
396c147e | 209 | static void |
2e73a022 | 210 | process_request_identities(SocketEntry *e, int version) |
8efc0c15 | 211 | { |
2e73a022 | 212 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 213 | Identity *id; |
e424e241 | 214 | Buffer msg; |
5260325f | 215 | |
216 | buffer_init(&msg); | |
2e73a022 | 217 | buffer_put_char(&msg, (version == 1) ? |
218 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
219 | buffer_put_int(&msg, tab->nentries); | |
95f0a918 | 220 | TAILQ_FOREACH(id, &tab->idlist, next) { |
fa08c86b | 221 | if (id->key->type == KEY_RSA1) { |
2e73a022 | 222 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
223 | buffer_put_bignum(&msg, id->key->rsa->e); | |
224 | buffer_put_bignum(&msg, id->key->rsa->n); | |
225 | } else { | |
1e3b8b07 | 226 | u_char *blob; |
227 | u_int blen; | |
fa08c86b | 228 | key_to_blob(id->key, &blob, &blen); |
2e73a022 | 229 | buffer_put_string(&msg, blob, blen); |
230 | xfree(blob); | |
231 | } | |
232 | buffer_put_cstring(&msg, id->comment); | |
5260325f | 233 | } |
234 | buffer_put_int(&e->output, buffer_len(&msg)); | |
235 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
236 | buffer_free(&msg); | |
8efc0c15 | 237 | } |
238 | ||
2e73a022 | 239 | /* ssh1 only */ |
396c147e | 240 | static void |
2e73a022 | 241 | process_authentication_challenge1(SocketEntry *e) |
8efc0c15 | 242 | { |
e424e241 | 243 | u_char buf[32], mdbuf[16], session_id[16]; |
244 | u_int response_type; | |
2e73a022 | 245 | BIGNUM *challenge; |
e424e241 | 246 | Identity *id; |
2e73a022 | 247 | int i, len; |
5260325f | 248 | Buffer msg; |
249 | MD5_CTX md; | |
e424e241 | 250 | Key *key; |
5260325f | 251 | |
252 | buffer_init(&msg); | |
fa08c86b | 253 | key = key_new(KEY_RSA1); |
b775c6f2 | 254 | if ((challenge = BN_new()) == NULL) |
255 | fatal("process_authentication_challenge1: BN_new failed"); | |
5260325f | 256 | |
1169c3df | 257 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 258 | buffer_get_bignum(&e->request, key->rsa->e); |
259 | buffer_get_bignum(&e->request, key->rsa->n); | |
260 | buffer_get_bignum(&e->request, challenge); | |
5260325f | 261 | |
2e73a022 | 262 | /* Only protocol 1.1 is supported */ |
b9dd5ca1 | 263 | if (buffer_len(&e->request) == 0) |
2e73a022 | 264 | goto failure; |
b9dd5ca1 | 265 | buffer_get(&e->request, session_id, 16); |
266 | response_type = buffer_get_int(&e->request); | |
2e73a022 | 267 | if (response_type != 1) |
268 | goto failure; | |
269 | ||
95f0a918 | 270 | id = lookup_identity(key, 1); |
c4087616 | 271 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { |
95f0a918 | 272 | Key *private = id->key; |
2e73a022 | 273 | /* Decrypt the challenge using the private key. */ |
46aa2d1f | 274 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
275 | goto failure; | |
2e73a022 | 276 | |
277 | /* The response is MD5 of decrypted challenge plus session id. */ | |
278 | len = BN_num_bytes(challenge); | |
279 | if (len <= 0 || len > 32) { | |
bbe88b6d | 280 | logit("process_authentication_challenge: bad challenge length %d", len); |
2e73a022 | 281 | goto failure; |
5260325f | 282 | } |
2e73a022 | 283 | memset(buf, 0, 32); |
284 | BN_bn2bin(challenge, buf + 32 - len); | |
285 | MD5_Init(&md); | |
286 | MD5_Update(&md, buf, 32); | |
287 | MD5_Update(&md, session_id, 16); | |
288 | MD5_Final(mdbuf, &md); | |
289 | ||
290 | /* Send the response. */ | |
291 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
292 | for (i = 0; i < 16; i++) | |
293 | buffer_put_char(&msg, mdbuf[i]); | |
294 | goto send; | |
295 | } | |
296 | ||
297 | failure: | |
298 | /* Unknown identity or protocol error. Send failure. */ | |
5260325f | 299 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
300 | send: | |
2e73a022 | 301 | buffer_put_int(&e->output, buffer_len(&msg)); |
302 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
303 | key_free(key); | |
304 | BN_clear_free(challenge); | |
305 | buffer_free(&msg); | |
306 | } | |
307 | ||
308 | /* ssh2 only */ | |
396c147e | 309 | static void |
2e73a022 | 310 | process_sign_request2(SocketEntry *e) |
311 | { | |
1e3b8b07 | 312 | u_char *blob, *data, *signature = NULL; |
313 | u_int blen, dlen, slen = 0; | |
e424e241 | 314 | extern int datafellows; |
9ee2fb0e | 315 | int odatafellows; |
e424e241 | 316 | int ok = -1, flags; |
2e73a022 | 317 | Buffer msg; |
e424e241 | 318 | Key *key; |
2e73a022 | 319 | |
320 | datafellows = 0; | |
227e8e86 | 321 | |
b9dd5ca1 | 322 | blob = buffer_get_string(&e->request, &blen); |
323 | data = buffer_get_string(&e->request, &dlen); | |
188adeb2 | 324 | |
b9dd5ca1 | 325 | flags = buffer_get_int(&e->request); |
9ee2fb0e | 326 | odatafellows = datafellows; |
188adeb2 | 327 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
328 | datafellows = SSH_BUG_SIGBLOB; | |
2e73a022 | 329 | |
fa08c86b | 330 | key = key_from_blob(blob, blen); |
2e73a022 | 331 | if (key != NULL) { |
95f0a918 | 332 | Identity *id = lookup_identity(key, 2); |
c4087616 | 333 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) |
95f0a918 | 334 | ok = key_sign(id->key, &signature, &slen, data, dlen); |
2b8dc5e3 | 335 | key_free(key); |
2e73a022 | 336 | } |
2e73a022 | 337 | buffer_init(&msg); |
338 | if (ok == 0) { | |
339 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
340 | buffer_put_string(&msg, signature, slen); | |
341 | } else { | |
342 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
343 | } | |
5260325f | 344 | buffer_put_int(&e->output, buffer_len(&msg)); |
345 | buffer_append(&e->output, buffer_ptr(&msg), | |
2e73a022 | 346 | buffer_len(&msg)); |
5260325f | 347 | buffer_free(&msg); |
2e73a022 | 348 | xfree(data); |
349 | xfree(blob); | |
350 | if (signature != NULL) | |
351 | xfree(signature); | |
9ee2fb0e | 352 | datafellows = odatafellows; |
8efc0c15 | 353 | } |
354 | ||
2e73a022 | 355 | /* shared */ |
396c147e | 356 | static void |
2e73a022 | 357 | process_remove_identity(SocketEntry *e, int version) |
8efc0c15 | 358 | { |
e424e241 | 359 | u_int blen, bits; |
360 | int success = 0; | |
95f0a918 | 361 | Key *key = NULL; |
1e3b8b07 | 362 | u_char *blob; |
2e73a022 | 363 | |
6aacefa7 | 364 | switch (version) { |
2e73a022 | 365 | case 1: |
fa08c86b | 366 | key = key_new(KEY_RSA1); |
b9dd5ca1 | 367 | bits = buffer_get_int(&e->request); |
368 | buffer_get_bignum(&e->request, key->rsa->e); | |
369 | buffer_get_bignum(&e->request, key->rsa->n); | |
2e73a022 | 370 | |
371 | if (bits != key_size(key)) | |
bbe88b6d | 372 | logit("Warning: identity keysize mismatch: actual %u, announced %u", |
42f11eb2 | 373 | key_size(key), bits); |
2e73a022 | 374 | break; |
375 | case 2: | |
b9dd5ca1 | 376 | blob = buffer_get_string(&e->request, &blen); |
fa08c86b | 377 | key = key_from_blob(blob, blen); |
2e73a022 | 378 | xfree(blob); |
379 | break; | |
380 | } | |
381 | if (key != NULL) { | |
95f0a918 | 382 | Identity *id = lookup_identity(key, version); |
383 | if (id != NULL) { | |
aa3378df | 384 | /* |
385 | * We have this key. Free the old key. Since we | |
7b9b0103 | 386 | * don't want to leave empty slots in the middle of |
d343d900 | 387 | * the array, we actually free the key there and move |
388 | * all the entries between the empty slot and the end | |
389 | * of the array. | |
aa3378df | 390 | */ |
2e73a022 | 391 | Idtab *tab = idtab_lookup(version); |
fa08c86b | 392 | if (tab->nentries < 1) |
393 | fatal("process_remove_identity: " | |
394 | "internal error: tab->nentries %d", | |
395 | tab->nentries); | |
95f0a918 | 396 | TAILQ_REMOVE(&tab->idlist, id, next); |
397 | free_identity(id); | |
2e73a022 | 398 | tab->nentries--; |
399 | success = 1; | |
5260325f | 400 | } |
2e73a022 | 401 | key_free(key); |
402 | } | |
8efc0c15 | 403 | buffer_put_int(&e->output, 1); |
2e73a022 | 404 | buffer_put_char(&e->output, |
405 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 406 | } |
407 | ||
396c147e | 408 | static void |
2e73a022 | 409 | process_remove_all_identities(SocketEntry *e, int version) |
8efc0c15 | 410 | { |
2e73a022 | 411 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 412 | Identity *id; |
8efc0c15 | 413 | |
5260325f | 414 | /* Loop over all identities and clear the keys. */ |
95f0a918 | 415 | for (id = TAILQ_FIRST(&tab->idlist); id; |
416 | id = TAILQ_FIRST(&tab->idlist)) { | |
417 | TAILQ_REMOVE(&tab->idlist, id, next); | |
418 | free_identity(id); | |
5260325f | 419 | } |
8efc0c15 | 420 | |
5260325f | 421 | /* Mark that there are no identities. */ |
2e73a022 | 422 | tab->nentries = 0; |
8efc0c15 | 423 | |
424 | /* Send success. */ | |
425 | buffer_put_int(&e->output, 1); | |
426 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
5260325f | 427 | } |
428 | ||
7f38e62e | 429 | /* removes expired keys and returns number of seconds until the next expiry */ |
430 | static u_int | |
264572cc | 431 | reaper(void) |
432 | { | |
7f38e62e | 433 | u_int deadline = 0, now = time(NULL); |
264572cc | 434 | Identity *id, *nxt; |
435 | int version; | |
e424e241 | 436 | Idtab *tab; |
264572cc | 437 | |
438 | for (version = 1; version < 3; version++) { | |
439 | tab = idtab_lookup(version); | |
440 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
441 | nxt = TAILQ_NEXT(id, next); | |
7f38e62e | 442 | if (id->death == 0) |
443 | continue; | |
444 | if (now >= id->death) { | |
f10f9102 | 445 | debug("expiring key '%s'", id->comment); |
264572cc | 446 | TAILQ_REMOVE(&tab->idlist, id, next); |
447 | free_identity(id); | |
448 | tab->nentries--; | |
7f38e62e | 449 | } else |
450 | deadline = (deadline == 0) ? id->death : | |
451 | MIN(deadline, id->death); | |
264572cc | 452 | } |
453 | } | |
7f38e62e | 454 | if (deadline == 0 || deadline <= now) |
455 | return 0; | |
456 | else | |
457 | return (deadline - now); | |
264572cc | 458 | } |
459 | ||
396c147e | 460 | static void |
fa08c86b | 461 | process_add_identity(SocketEntry *e, int version) |
462 | { | |
2e73a022 | 463 | Idtab *tab = idtab_lookup(version); |
18660b86 | 464 | Identity *id; |
c4087616 | 465 | int type, success = 0, death = 0, confirm = 0; |
e424e241 | 466 | char *type_name, *comment; |
467 | Key *k = NULL; | |
5260325f | 468 | |
2e73a022 | 469 | switch (version) { |
470 | case 1: | |
fa08c86b | 471 | k = key_new_private(KEY_RSA1); |
1169c3df | 472 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 473 | buffer_get_bignum(&e->request, k->rsa->n); |
474 | buffer_get_bignum(&e->request, k->rsa->e); | |
475 | buffer_get_bignum(&e->request, k->rsa->d); | |
476 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
2e73a022 | 477 | |
478 | /* SSH and SSL have p and q swapped */ | |
b9dd5ca1 | 479 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
480 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
2e73a022 | 481 | |
482 | /* Generate additional parameters */ | |
2b63e803 | 483 | rsa_generate_additional_parameters(k->rsa); |
2e73a022 | 484 | break; |
485 | case 2: | |
b9dd5ca1 | 486 | type_name = buffer_get_string(&e->request, NULL); |
42f11eb2 | 487 | type = key_type_from_name(type_name); |
fa08c86b | 488 | xfree(type_name); |
6aacefa7 | 489 | switch (type) { |
fa08c86b | 490 | case KEY_DSA: |
491 | k = key_new_private(type); | |
b9dd5ca1 | 492 | buffer_get_bignum2(&e->request, k->dsa->p); |
493 | buffer_get_bignum2(&e->request, k->dsa->q); | |
494 | buffer_get_bignum2(&e->request, k->dsa->g); | |
495 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
496 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
fa08c86b | 497 | break; |
498 | case KEY_RSA: | |
499 | k = key_new_private(type); | |
b9dd5ca1 | 500 | buffer_get_bignum2(&e->request, k->rsa->n); |
501 | buffer_get_bignum2(&e->request, k->rsa->e); | |
502 | buffer_get_bignum2(&e->request, k->rsa->d); | |
503 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
504 | buffer_get_bignum2(&e->request, k->rsa->p); | |
505 | buffer_get_bignum2(&e->request, k->rsa->q); | |
fa08c86b | 506 | |
507 | /* Generate additional parameters */ | |
2b63e803 | 508 | rsa_generate_additional_parameters(k->rsa); |
fa08c86b | 509 | break; |
510 | default: | |
b9dd5ca1 | 511 | buffer_clear(&e->request); |
2e73a022 | 512 | goto send; |
5260325f | 513 | } |
2e73a022 | 514 | break; |
515 | } | |
cb0e1d67 | 516 | /* enable blinding */ |
517 | switch (k->type) { | |
518 | case KEY_RSA: | |
519 | case KEY_RSA1: | |
520 | if (RSA_blinding_on(k->rsa, NULL) != 1) { | |
521 | error("process_add_identity: RSA_blinding_on failed"); | |
522 | key_free(k); | |
523 | goto send; | |
524 | } | |
525 | break; | |
526 | } | |
b9dd5ca1 | 527 | comment = buffer_get_string(&e->request, NULL); |
2e73a022 | 528 | if (k == NULL) { |
529 | xfree(comment); | |
530 | goto send; | |
531 | } | |
ee900f87 | 532 | while (buffer_len(&e->request)) { |
c525650a | 533 | switch ((type = buffer_get_char(&e->request))) { |
ee900f87 | 534 | case SSH_AGENT_CONSTRAIN_LIFETIME: |
535 | death = time(NULL) + buffer_get_int(&e->request); | |
536 | break; | |
c4087616 | 537 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
538 | confirm = 1; | |
539 | break; | |
ee900f87 | 540 | default: |
c525650a | 541 | error("process_add_identity: " |
542 | "Unknown constraint type %d", type); | |
543 | xfree(comment); | |
544 | key_free(k); | |
545 | goto send; | |
ee900f87 | 546 | } |
547 | } | |
c525650a | 548 | success = 1; |
494b267f | 549 | if (lifetime && !death) |
550 | death = time(NULL) + lifetime; | |
18660b86 | 551 | if ((id = lookup_identity(k, version)) == NULL) { |
552 | id = xmalloc(sizeof(Identity)); | |
95f0a918 | 553 | id->key = k; |
95f0a918 | 554 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
2e73a022 | 555 | /* Increment the number of identities. */ |
556 | tab->nentries++; | |
557 | } else { | |
558 | key_free(k); | |
18660b86 | 559 | xfree(id->comment); |
2e73a022 | 560 | } |
18660b86 | 561 | id->comment = comment; |
562 | id->death = death; | |
563 | id->confirm = confirm; | |
2e73a022 | 564 | send: |
5260325f | 565 | buffer_put_int(&e->output, 1); |
2e73a022 | 566 | buffer_put_char(&e->output, |
567 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 568 | } |
569 | ||
3db7f994 | 570 | /* XXX todo: encrypt sensitive data with passphrase */ |
571 | static void | |
572 | process_lock_agent(SocketEntry *e, int lock) | |
573 | { | |
3db7f994 | 574 | int success = 0; |
e424e241 | 575 | char *passwd; |
3db7f994 | 576 | |
577 | passwd = buffer_get_string(&e->request, NULL); | |
578 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
579 | locked = 0; | |
580 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
581 | xfree(lock_passwd); | |
582 | lock_passwd = NULL; | |
583 | success = 1; | |
584 | } else if (!locked && lock) { | |
585 | locked = 1; | |
586 | lock_passwd = xstrdup(passwd); | |
587 | success = 1; | |
588 | } | |
589 | memset(passwd, 0, strlen(passwd)); | |
590 | xfree(passwd); | |
7203d6bb | 591 | |
3db7f994 | 592 | buffer_put_int(&e->output, 1); |
593 | buffer_put_char(&e->output, | |
594 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
3db7f994 | 595 | } |
596 | ||
597 | static void | |
598 | no_identities(SocketEntry *e, u_int type) | |
599 | { | |
600 | Buffer msg; | |
601 | ||
602 | buffer_init(&msg); | |
603 | buffer_put_char(&msg, | |
604 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
605 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
606 | buffer_put_int(&msg, 0); | |
607 | buffer_put_int(&e->output, buffer_len(&msg)); | |
608 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
609 | buffer_free(&msg); | |
610 | } | |
2b5fe3b8 | 611 | |
612 | #ifdef SMARTCARD | |
613 | static void | |
c525650a | 614 | process_add_smartcard_key(SocketEntry *e) |
2b5fe3b8 | 615 | { |
76139bd8 | 616 | char *sc_reader_id = NULL, *pin; |
c525650a | 617 | int i, type, version, success = 0, death = 0, confirm = 0; |
e424e241 | 618 | Key **keys, *k; |
619 | Identity *id; | |
620 | Idtab *tab; | |
184eed6a | 621 | |
b9dd5ca1 | 622 | sc_reader_id = buffer_get_string(&e->request, NULL); |
623 | pin = buffer_get_string(&e->request, NULL); | |
ca719034 | 624 | |
625 | while (buffer_len(&e->request)) { | |
c525650a | 626 | switch ((type = buffer_get_char(&e->request))) { |
ca719034 | 627 | case SSH_AGENT_CONSTRAIN_LIFETIME: |
628 | death = time(NULL) + buffer_get_int(&e->request); | |
629 | break; | |
630 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
631 | confirm = 1; | |
632 | break; | |
633 | default: | |
c525650a | 634 | error("process_add_smartcard_key: " |
635 | "Unknown constraint type %d", type); | |
636 | xfree(sc_reader_id); | |
637 | xfree(pin); | |
638 | goto send; | |
ca719034 | 639 | } |
640 | } | |
641 | if (lifetime && !death) | |
642 | death = time(NULL) + lifetime; | |
643 | ||
0659cace | 644 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 645 | xfree(sc_reader_id); |
76139bd8 | 646 | xfree(pin); |
2b5fe3b8 | 647 | |
0659cace | 648 | if (keys == NULL || keys[0] == NULL) { |
649 | error("sc_get_keys failed"); | |
2b5fe3b8 | 650 | goto send; |
651 | } | |
0659cace | 652 | for (i = 0; keys[i] != NULL; i++) { |
653 | k = keys[i]; | |
654 | version = k->type == KEY_RSA1 ? 1 : 2; | |
655 | tab = idtab_lookup(version); | |
656 | if (lookup_identity(k, version) == NULL) { | |
657 | id = xmalloc(sizeof(Identity)); | |
658 | id->key = k; | |
244e796f | 659 | id->comment = sc_get_key_label(k); |
ca719034 | 660 | id->death = death; |
661 | id->confirm = confirm; | |
0659cace | 662 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
663 | tab->nentries++; | |
664 | success = 1; | |
665 | } else { | |
666 | key_free(k); | |
667 | } | |
668 | keys[i] = NULL; | |
2b5fe3b8 | 669 | } |
0659cace | 670 | xfree(keys); |
2b5fe3b8 | 671 | send: |
672 | buffer_put_int(&e->output, 1); | |
673 | buffer_put_char(&e->output, | |
674 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
675 | } | |
676 | ||
677 | static void | |
678 | process_remove_smartcard_key(SocketEntry *e) | |
679 | { | |
76139bd8 | 680 | char *sc_reader_id = NULL, *pin; |
0659cace | 681 | int i, version, success = 0; |
e424e241 | 682 | Key **keys, *k = NULL; |
683 | Identity *id; | |
684 | Idtab *tab; | |
2b5fe3b8 | 685 | |
b9dd5ca1 | 686 | sc_reader_id = buffer_get_string(&e->request, NULL); |
687 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 688 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 689 | xfree(sc_reader_id); |
76139bd8 | 690 | xfree(pin); |
2b5fe3b8 | 691 | |
0659cace | 692 | if (keys == NULL || keys[0] == NULL) { |
693 | error("sc_get_keys failed"); | |
694 | goto send; | |
695 | } | |
696 | for (i = 0; keys[i] != NULL; i++) { | |
697 | k = keys[i]; | |
698 | version = k->type == KEY_RSA1 ? 1 : 2; | |
699 | if ((id = lookup_identity(k, version)) != NULL) { | |
700 | tab = idtab_lookup(version); | |
875ec275 | 701 | TAILQ_REMOVE(&tab->idlist, id, next); |
2b5fe3b8 | 702 | tab->nentries--; |
95f0a918 | 703 | free_identity(id); |
2b5fe3b8 | 704 | success = 1; |
705 | } | |
706 | key_free(k); | |
0659cace | 707 | keys[i] = NULL; |
2b5fe3b8 | 708 | } |
0659cace | 709 | xfree(keys); |
710 | send: | |
2b5fe3b8 | 711 | buffer_put_int(&e->output, 1); |
712 | buffer_put_char(&e->output, | |
713 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
714 | } | |
3e984472 | 715 | #endif /* SMARTCARD */ |
2b5fe3b8 | 716 | |
2e73a022 | 717 | /* dispatch incoming messages */ |
718 | ||
396c147e | 719 | static void |
8efc0c15 | 720 | process_message(SocketEntry *e) |
721 | { | |
e424e241 | 722 | u_int msg_len, type; |
1e3b8b07 | 723 | u_char *cp; |
264572cc | 724 | |
5260325f | 725 | if (buffer_len(&e->input) < 5) |
726 | return; /* Incomplete message. */ | |
20905a8e | 727 | cp = buffer_ptr(&e->input); |
51e7a012 | 728 | msg_len = get_u32(cp); |
5260325f | 729 | if (msg_len > 256 * 1024) { |
c1a4eef1 | 730 | close_socket(e); |
5260325f | 731 | return; |
732 | } | |
733 | if (buffer_len(&e->input) < msg_len + 4) | |
734 | return; | |
b9dd5ca1 | 735 | |
736 | /* move the current input to e->request */ | |
5260325f | 737 | buffer_consume(&e->input, 4); |
b9dd5ca1 | 738 | buffer_clear(&e->request); |
739 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
740 | buffer_consume(&e->input, msg_len); | |
741 | type = buffer_get_char(&e->request); | |
5260325f | 742 | |
3db7f994 | 743 | /* check wheter agent is locked */ |
744 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
745 | buffer_clear(&e->request); | |
746 | switch (type) { | |
747 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
748 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
749 | /* send empty lists */ | |
750 | no_identities(e, type); | |
751 | break; | |
752 | default: | |
753 | /* send a fail message for all other request types */ | |
754 | buffer_put_int(&e->output, 1); | |
755 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
756 | } | |
757 | return; | |
758 | } | |
759 | ||
2b5fe3b8 | 760 | debug("type %d", type); |
5260325f | 761 | switch (type) { |
3db7f994 | 762 | case SSH_AGENTC_LOCK: |
763 | case SSH_AGENTC_UNLOCK: | |
764 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
765 | break; | |
2e73a022 | 766 | /* ssh1 */ |
5260325f | 767 | case SSH_AGENTC_RSA_CHALLENGE: |
2e73a022 | 768 | process_authentication_challenge1(e); |
769 | break; | |
770 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
771 | process_request_identities(e, 1); | |
5260325f | 772 | break; |
773 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
ee900f87 | 774 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
2e73a022 | 775 | process_add_identity(e, 1); |
5260325f | 776 | break; |
777 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
2e73a022 | 778 | process_remove_identity(e, 1); |
5260325f | 779 | break; |
780 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
2e73a022 | 781 | process_remove_all_identities(e, 1); |
782 | break; | |
783 | /* ssh2 */ | |
784 | case SSH2_AGENTC_SIGN_REQUEST: | |
785 | process_sign_request2(e); | |
786 | break; | |
787 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
788 | process_request_identities(e, 2); | |
789 | break; | |
790 | case SSH2_AGENTC_ADD_IDENTITY: | |
ee900f87 | 791 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
2e73a022 | 792 | process_add_identity(e, 2); |
793 | break; | |
794 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
795 | process_remove_identity(e, 2); | |
796 | break; | |
797 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
798 | process_remove_all_identities(e, 2); | |
5260325f | 799 | break; |
2b5fe3b8 | 800 | #ifdef SMARTCARD |
801 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
ca719034 | 802 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: |
2b5fe3b8 | 803 | process_add_smartcard_key(e); |
184eed6a | 804 | break; |
2b5fe3b8 | 805 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
806 | process_remove_smartcard_key(e); | |
184eed6a | 807 | break; |
3e984472 | 808 | #endif /* SMARTCARD */ |
5260325f | 809 | default: |
810 | /* Unknown message. Respond with failure. */ | |
811 | error("Unknown message %d", type); | |
b9dd5ca1 | 812 | buffer_clear(&e->request); |
5260325f | 813 | buffer_put_int(&e->output, 1); |
814 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
815 | break; | |
816 | } | |
8efc0c15 | 817 | } |
818 | ||
396c147e | 819 | static void |
17a3011c | 820 | new_socket(sock_type type, int fd) |
8efc0c15 | 821 | { |
c46e584f | 822 | u_int i, old_alloc, new_alloc; |
e424e241 | 823 | |
170694d7 | 824 | set_nonblock(fd); |
5260325f | 825 | |
826 | if (fd > max_fd) | |
827 | max_fd = fd; | |
828 | ||
829 | for (i = 0; i < sockets_alloc; i++) | |
830 | if (sockets[i].type == AUTH_UNUSED) { | |
831 | sockets[i].fd = fd; | |
5260325f | 832 | buffer_init(&sockets[i].input); |
833 | buffer_init(&sockets[i].output); | |
b9dd5ca1 | 834 | buffer_init(&sockets[i].request); |
c46e584f | 835 | sockets[i].type = type; |
5260325f | 836 | return; |
837 | } | |
838 | old_alloc = sockets_alloc; | |
c46e584f | 839 | new_alloc = sockets_alloc + 10; |
c5d10563 | 840 | sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); |
c46e584f | 841 | for (i = old_alloc; i < new_alloc; i++) |
5260325f | 842 | sockets[i].type = AUTH_UNUSED; |
c46e584f | 843 | sockets_alloc = new_alloc; |
5260325f | 844 | sockets[old_alloc].fd = fd; |
845 | buffer_init(&sockets[old_alloc].input); | |
846 | buffer_init(&sockets[old_alloc].output); | |
b9dd5ca1 | 847 | buffer_init(&sockets[old_alloc].request); |
c46e584f | 848 | sockets[old_alloc].type = type; |
8efc0c15 | 849 | } |
850 | ||
396c147e | 851 | static int |
7f38e62e | 852 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp, |
853 | struct timeval **tvpp) | |
8efc0c15 | 854 | { |
7f38e62e | 855 | u_int i, sz, deadline; |
42f11eb2 | 856 | int n = 0; |
7f38e62e | 857 | static struct timeval tv; |
42f11eb2 | 858 | |
859 | for (i = 0; i < sockets_alloc; i++) { | |
5260325f | 860 | switch (sockets[i].type) { |
861 | case AUTH_SOCKET: | |
862 | case AUTH_CONNECTION: | |
42f11eb2 | 863 | n = MAX(n, sockets[i].fd); |
5260325f | 864 | break; |
865 | case AUTH_UNUSED: | |
866 | break; | |
867 | default: | |
868 | fatal("Unknown socket type %d", sockets[i].type); | |
869 | break; | |
870 | } | |
42f11eb2 | 871 | } |
872 | ||
873 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
e364646f | 874 | if (*fdrp == NULL || sz > *nallocp) { |
42f11eb2 | 875 | if (*fdrp) |
894c5fa6 | 876 | xfree(*fdrp); |
42f11eb2 | 877 | if (*fdwp) |
894c5fa6 | 878 | xfree(*fdwp); |
42f11eb2 | 879 | *fdrp = xmalloc(sz); |
880 | *fdwp = xmalloc(sz); | |
e364646f | 881 | *nallocp = sz; |
42f11eb2 | 882 | } |
e364646f | 883 | if (n < *fdl) |
884 | debug("XXX shrink: %d < %d", n, *fdl); | |
885 | *fdl = n; | |
42f11eb2 | 886 | memset(*fdrp, 0, sz); |
887 | memset(*fdwp, 0, sz); | |
888 | ||
889 | for (i = 0; i < sockets_alloc; i++) { | |
890 | switch (sockets[i].type) { | |
891 | case AUTH_SOCKET: | |
892 | case AUTH_CONNECTION: | |
893 | FD_SET(sockets[i].fd, *fdrp); | |
894 | if (buffer_len(&sockets[i].output) > 0) | |
895 | FD_SET(sockets[i].fd, *fdwp); | |
896 | break; | |
897 | default: | |
898 | break; | |
899 | } | |
900 | } | |
7f38e62e | 901 | deadline = reaper(); |
902 | if (parent_alive_interval != 0) | |
903 | deadline = (deadline == 0) ? parent_alive_interval : | |
904 | MIN(deadline, parent_alive_interval); | |
905 | if (deadline == 0) { | |
906 | *tvpp = NULL; | |
907 | } else { | |
908 | tv.tv_sec = deadline; | |
909 | tv.tv_usec = 0; | |
910 | *tvpp = &tv; | |
911 | } | |
42f11eb2 | 912 | return (1); |
8efc0c15 | 913 | } |
914 | ||
396c147e | 915 | static void |
5260325f | 916 | after_select(fd_set *readset, fd_set *writeset) |
8efc0c15 | 917 | { |
e424e241 | 918 | struct sockaddr_un sunaddr; |
610cd5c6 | 919 | socklen_t slen; |
5260325f | 920 | char buf[1024]; |
e424e241 | 921 | int len, sock; |
5561856d | 922 | u_int i, orig_alloc; |
87f4111f | 923 | uid_t euid; |
924 | gid_t egid; | |
5260325f | 925 | |
5561856d | 926 | for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++) |
5260325f | 927 | switch (sockets[i].type) { |
928 | case AUTH_UNUSED: | |
929 | break; | |
930 | case AUTH_SOCKET: | |
931 | if (FD_ISSET(sockets[i].fd, readset)) { | |
610cd5c6 | 932 | slen = sizeof(sunaddr); |
42f11eb2 | 933 | sock = accept(sockets[i].fd, |
32596c7b | 934 | (struct sockaddr *)&sunaddr, &slen); |
5260325f | 935 | if (sock < 0) { |
fccfbe3b | 936 | error("accept from AUTH_SOCKET: %s", |
937 | strerror(errno)); | |
5260325f | 938 | break; |
939 | } | |
87f4111f | 940 | if (getpeereid(sock, &euid, &egid) < 0) { |
941 | error("getpeereid %d failed: %s", | |
942 | sock, strerror(errno)); | |
943 | close(sock); | |
944 | break; | |
945 | } | |
e139021d | 946 | if ((euid != 0) && (getuid() != euid)) { |
87f4111f | 947 | error("uid mismatch: " |
792e7d2d | 948 | "peer euid %u != uid %u", |
949 | (u_int) euid, (u_int) getuid()); | |
87f4111f | 950 | close(sock); |
951 | break; | |
952 | } | |
5260325f | 953 | new_socket(AUTH_CONNECTION, sock); |
954 | } | |
955 | break; | |
956 | case AUTH_CONNECTION: | |
957 | if (buffer_len(&sockets[i].output) > 0 && | |
958 | FD_ISSET(sockets[i].fd, writeset)) { | |
5561856d | 959 | len = write(sockets[i].fd, |
960 | buffer_ptr(&sockets[i].output), | |
961 | buffer_len(&sockets[i].output)); | |
962 | if (len == -1 && (errno == EAGAIN || | |
963 | errno == EWOULDBLOCK || | |
964 | errno == EINTR)) | |
965 | continue; | |
5260325f | 966 | if (len <= 0) { |
c1a4eef1 | 967 | close_socket(&sockets[i]); |
5260325f | 968 | break; |
969 | } | |
970 | buffer_consume(&sockets[i].output, len); | |
971 | } | |
972 | if (FD_ISSET(sockets[i].fd, readset)) { | |
5561856d | 973 | len = read(sockets[i].fd, buf, sizeof(buf)); |
974 | if (len == -1 && (errno == EAGAIN || | |
975 | errno == EWOULDBLOCK || | |
976 | errno == EINTR)) | |
977 | continue; | |
5260325f | 978 | if (len <= 0) { |
c1a4eef1 | 979 | close_socket(&sockets[i]); |
5260325f | 980 | break; |
981 | } | |
982 | buffer_append(&sockets[i].input, buf, len); | |
983 | process_message(&sockets[i]); | |
984 | } | |
985 | break; | |
986 | default: | |
987 | fatal("Unknown type %d", sockets[i].type); | |
988 | } | |
8efc0c15 | 989 | } |
990 | ||
396c147e | 991 | static void |
cd25664d | 992 | cleanup_socket(void) |
dae3fa13 | 993 | { |
2f4b2e38 | 994 | if (socket_name[0]) |
995 | unlink(socket_name); | |
996 | if (socket_dir[0]) | |
997 | rmdir(socket_dir); | |
8efc0c15 | 998 | } |
999 | ||
2362db19 | 1000 | void |
dae3fa13 | 1001 | cleanup_exit(int i) |
1002 | { | |
cd25664d | 1003 | cleanup_socket(); |
1004 | _exit(i); | |
dae3fa13 | 1005 | } |
1006 | ||
8d0b0353 | 1007 | /*ARGSUSED*/ |
396c147e | 1008 | static void |
2f4b2e38 | 1009 | cleanup_handler(int sig) |
1010 | { | |
cd25664d | 1011 | cleanup_socket(); |
2f4b2e38 | 1012 | _exit(2); |
1013 | } | |
1014 | ||
7efa8482 | 1015 | static void |
7f38e62e | 1016 | check_parent_exists(void) |
7efa8482 | 1017 | { |
7efa8482 | 1018 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { |
1019 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
7f38e62e | 1020 | cleanup_socket(); |
1021 | _exit(2); | |
7efa8482 | 1022 | } |
7efa8482 | 1023 | } |
1024 | ||
396c147e | 1025 | static void |
cc8aca8a | 1026 | usage(void) |
dae3fa13 | 1027 | { |
269cfc8a | 1028 | fprintf(stderr, "usage: %s [options] [command [arg ...]]\n", |
0e3c1f95 | 1029 | __progname); |
33e766d2 | 1030 | fprintf(stderr, "Options:\n"); |
1031 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
1032 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
1033 | fprintf(stderr, " -k Kill the current agent.\n"); | |
1034 | fprintf(stderr, " -d Debug mode.\n"); | |
3e7efb37 | 1035 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
494b267f | 1036 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); |
5260325f | 1037 | exit(1); |
dae3fa13 | 1038 | } |
1039 | ||
8efc0c15 | 1040 | int |
1041 | main(int ac, char **av) | |
1042 | { | |
c4087616 | 1043 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; |
f10f9102 | 1044 | int sock, fd, ch, result, saved_errno; |
9a995072 | 1045 | u_int nalloc; |
e424e241 | 1046 | char *shell, *format, *pidstr, *agentsocket = NULL; |
1047 | fd_set *readsetp = NULL, *writesetp = NULL; | |
5260325f | 1048 | struct sockaddr_un sunaddr; |
b03bd394 | 1049 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1050 | struct rlimit rlim; |
c7ccfd39 | 1051 | #endif |
c7ccfd39 | 1052 | int prev_mask; |
c04f75f1 | 1053 | extern int optind; |
ef3912be | 1054 | extern char *optarg; |
e424e241 | 1055 | pid_t pid; |
1056 | char pidstrbuf[1 + 3 * sizeof pid]; | |
7f38e62e | 1057 | struct timeval *tvp = NULL; |
7027325d | 1058 | size_t len; |
fcb975eb | 1059 | |
fd6168c1 | 1060 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
1061 | sanitise_stdfd(); | |
1062 | ||
954640a4 | 1063 | /* drop */ |
1064 | setegid(getgid()); | |
1065 | setgid(getgid()); | |
1066 | ||
e7f6070d | 1067 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) |
1068 | /* Disable ptrace on Linux without sgid bit */ | |
1069 | prctl(PR_SET_DUMPABLE, 0); | |
1070 | #endif | |
1071 | ||
457fc0c6 | 1072 | SSLeay_add_all_algorithms(); |
1073 | ||
fda04d7d | 1074 | __progname = ssh_get_progname(av[0]); |
264dce47 | 1075 | init_rng(); |
e339aa53 | 1076 | seed_rng(); |
2b87da3b | 1077 | |
494b267f | 1078 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { |
5260325f | 1079 | switch (ch) { |
1080 | case 'c': | |
1081 | if (s_flag) | |
1082 | usage(); | |
1083 | c_flag++; | |
1084 | break; | |
1085 | case 'k': | |
1086 | k_flag++; | |
1087 | break; | |
1088 | case 's': | |
1089 | if (c_flag) | |
1090 | usage(); | |
1091 | s_flag++; | |
1092 | break; | |
ffdb5d70 | 1093 | case 'd': |
1094 | if (d_flag) | |
1095 | usage(); | |
1096 | d_flag++; | |
1097 | break; | |
3e7efb37 | 1098 | case 'a': |
1099 | agentsocket = optarg; | |
1100 | break; | |
494b267f | 1101 | case 't': |
1102 | if ((lifetime = convtime(optarg)) == -1) { | |
1103 | fprintf(stderr, "Invalid lifetime\n"); | |
1104 | usage(); | |
1105 | } | |
1106 | break; | |
5260325f | 1107 | default: |
1108 | usage(); | |
1109 | } | |
dae3fa13 | 1110 | } |
5260325f | 1111 | ac -= optind; |
1112 | av += optind; | |
1113 | ||
ffdb5d70 | 1114 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
5260325f | 1115 | usage(); |
1116 | ||
b745a2f2 | 1117 | if (ac == 0 && !c_flag && !s_flag) { |
5260325f | 1118 | shell = getenv("SHELL"); |
7027325d | 1119 | if (shell != NULL && (len = strlen(shell)) > 2 && |
1120 | strncmp(shell + len - 3, "csh", 3) == 0) | |
5260325f | 1121 | c_flag = 1; |
dae3fa13 | 1122 | } |
5260325f | 1123 | if (k_flag) { |
cfaa5405 | 1124 | const char *errstr = NULL; |
1125 | ||
5260325f | 1126 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
1127 | if (pidstr == NULL) { | |
1128 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
42f11eb2 | 1129 | SSH_AGENTPID_ENV_NAME); |
5260325f | 1130 | exit(1); |
1131 | } | |
cfaa5405 | 1132 | pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); |
1133 | if (errstr) { | |
1134 | fprintf(stderr, | |
1135 | "%s=\"%s\", which is not a good PID: %s\n", | |
1136 | SSH_AGENTPID_ENV_NAME, pidstr, errstr); | |
5260325f | 1137 | exit(1); |
1138 | } | |
1139 | if (kill(pid, SIGTERM) == -1) { | |
1140 | perror("kill"); | |
1141 | exit(1); | |
1142 | } | |
1143 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1144 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1145 | printf(format, SSH_AGENTPID_ENV_NAME); | |
c457707e | 1146 | printf("echo Agent pid %ld killed;\n", (long)pid); |
5260325f | 1147 | exit(0); |
dae3fa13 | 1148 | } |
5260325f | 1149 | parent_pid = getpid(); |
1150 | ||
3e7efb37 | 1151 | if (agentsocket == NULL) { |
1152 | /* Create private directory for agent socket */ | |
c88de854 | 1153 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir); |
3e7efb37 | 1154 | if (mkdtemp(socket_dir) == NULL) { |
1155 | perror("mkdtemp: private socket dir"); | |
1156 | exit(1); | |
1157 | } | |
c457707e | 1158 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
1159 | (long)parent_pid); | |
3e7efb37 | 1160 | } else { |
1161 | /* Try to use specified agent socket */ | |
1162 | socket_dir[0] = '\0'; | |
1163 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
5260325f | 1164 | } |
5260325f | 1165 | |
aa3378df | 1166 | /* |
1167 | * Create socket early so it will exist before command gets run from | |
1168 | * the parent. | |
1169 | */ | |
5260325f | 1170 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
1171 | if (sock < 0) { | |
1172 | perror("socket"); | |
8e8d8c82 | 1173 | *socket_name = '\0'; /* Don't unlink any existing file */ |
5260325f | 1174 | cleanup_exit(1); |
1175 | } | |
1176 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1177 | sunaddr.sun_family = AF_UNIX; | |
1178 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
c7ccfd39 | 1179 | prev_mask = umask(0177); |
32596c7b | 1180 | if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { |
5260325f | 1181 | perror("bind"); |
8e8d8c82 | 1182 | *socket_name = '\0'; /* Don't unlink any existing file */ |
c7ccfd39 | 1183 | umask(prev_mask); |
5260325f | 1184 | cleanup_exit(1); |
1185 | } | |
c7ccfd39 | 1186 | umask(prev_mask); |
fce39749 | 1187 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
5260325f | 1188 | perror("listen"); |
1189 | cleanup_exit(1); | |
dae3fa13 | 1190 | } |
42f11eb2 | 1191 | |
aa3378df | 1192 | /* |
1193 | * Fork, and have the parent execute the command, if any, or present | |
1194 | * the socket data. The child continues as the authentication agent. | |
1195 | */ | |
ffdb5d70 | 1196 | if (d_flag) { |
1197 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1198 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1199 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1200 | SSH_AUTHSOCKET_ENV_NAME); | |
c457707e | 1201 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
ffdb5d70 | 1202 | goto skip; |
1203 | } | |
5260325f | 1204 | pid = fork(); |
1205 | if (pid == -1) { | |
1206 | perror("fork"); | |
fccfbe3b | 1207 | cleanup_exit(1); |
dae3fa13 | 1208 | } |
5260325f | 1209 | if (pid != 0) { /* Parent - execute the given command. */ |
1210 | close(sock); | |
c457707e | 1211 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
5260325f | 1212 | if (ac == 0) { |
1213 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1214 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
42f11eb2 | 1215 | SSH_AUTHSOCKET_ENV_NAME); |
5260325f | 1216 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
42f11eb2 | 1217 | SSH_AGENTPID_ENV_NAME); |
c457707e | 1218 | printf("echo Agent pid %ld;\n", (long)pid); |
5260325f | 1219 | exit(0); |
1220 | } | |
bcbf86ec | 1221 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
1222 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1223 | perror("setenv"); | |
1224 | exit(1); | |
1225 | } | |
5260325f | 1226 | execvp(av[0], av); |
1227 | perror(av[0]); | |
1228 | exit(1); | |
1229 | } | |
fccfbe3b | 1230 | /* child */ |
1231 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
ec9f3450 | 1232 | |
1233 | if (setsid() == -1) { | |
fccfbe3b | 1234 | error("setsid: %s", strerror(errno)); |
ec9f3450 | 1235 | cleanup_exit(1); |
1236 | } | |
1237 | ||
1238 | (void)chdir("/"); | |
c4087616 | 1239 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
1240 | /* XXX might close listen socket */ | |
1241 | (void)dup2(fd, STDIN_FILENO); | |
1242 | (void)dup2(fd, STDOUT_FILENO); | |
1243 | (void)dup2(fd, STDERR_FILENO); | |
1244 | if (fd > 2) | |
1245 | close(fd); | |
1246 | } | |
dae3fa13 | 1247 | |
b03bd394 | 1248 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1249 | /* deny core dumps, since memory contains unencrypted private keys */ |
1250 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1251 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
fccfbe3b | 1252 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
0b6fbf03 | 1253 | cleanup_exit(1); |
1254 | } | |
b03bd394 | 1255 | #endif |
ffdb5d70 | 1256 | |
1257 | skip: | |
5260325f | 1258 | new_socket(AUTH_SOCKET, sock); |
7f38e62e | 1259 | if (ac > 0) |
1260 | parent_alive_interval = 10; | |
2e73a022 | 1261 | idtab_init(); |
1ee482c5 | 1262 | if (!d_flag) |
ffdb5d70 | 1263 | signal(SIGINT, SIG_IGN); |
1ee482c5 | 1264 | signal(SIGPIPE, SIG_IGN); |
2f4b2e38 | 1265 | signal(SIGHUP, cleanup_handler); |
1266 | signal(SIGTERM, cleanup_handler); | |
e364646f | 1267 | nalloc = 0; |
1268 | ||
5260325f | 1269 | while (1) { |
7f38e62e | 1270 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp); |
1271 | result = select(max_fd + 1, readsetp, writesetp, NULL, tvp); | |
f10f9102 | 1272 | saved_errno = errno; |
7f38e62e | 1273 | if (parent_alive_interval != 0) |
1274 | check_parent_exists(); | |
1275 | (void) reaper(); /* remove expired keys */ | |
f10f9102 | 1276 | if (result < 0) { |
1277 | if (saved_errno == EINTR) | |
5260325f | 1278 | continue; |
f10f9102 | 1279 | fatal("select: %s", strerror(saved_errno)); |
1280 | } else if (result > 0) | |
1281 | after_select(readsetp, writesetp); | |
8efc0c15 | 1282 | } |
5260325f | 1283 | /* NOTREACHED */ |
8efc0c15 | 1284 | } |