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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5260325f | 5 | * The authentication agent program. |
2e73a022 | 6 | * |
bcbf86ec | 7 | * As far as I am concerned, the code I have written for this software |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | * | |
a96070d4 | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 14 | * |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 34 | */ |
8efc0c15 | 35 | |
36 | #include "includes.h" | |
9fd2a215 | 37 | #include "openbsd-compat/sys-queue.h" |
494b267f | 38 | RCSID("$OpenBSD: ssh-agent.c,v 1.106 2003/01/21 18:14:36 marc Exp $"); |
187cd1fa | 39 | |
42f11eb2 | 40 | #include <openssl/evp.h> |
41 | #include <openssl/md5.h> | |
8efc0c15 | 42 | |
43 | #include "ssh.h" | |
44 | #include "rsa.h" | |
8efc0c15 | 45 | #include "buffer.h" |
46 | #include "bufaux.h" | |
47 | #include "xmalloc.h" | |
8efc0c15 | 48 | #include "getput.h" |
4c8722d9 | 49 | #include "key.h" |
50 | #include "authfd.h" | |
188adeb2 | 51 | #include "compat.h" |
42f11eb2 | 52 | #include "log.h" |
8efc0c15 | 53 | |
2b5fe3b8 | 54 | #ifdef SMARTCARD |
2b5fe3b8 | 55 | #include "scard.h" |
dd2495cb | 56 | #endif |
2b5fe3b8 | 57 | |
17a3011c | 58 | typedef enum { |
59 | AUTH_UNUSED, | |
60 | AUTH_SOCKET, | |
61 | AUTH_CONNECTION | |
62 | } sock_type; | |
63 | ||
5260325f | 64 | typedef struct { |
65 | int fd; | |
17a3011c | 66 | sock_type type; |
5260325f | 67 | Buffer input; |
68 | Buffer output; | |
b9dd5ca1 | 69 | Buffer request; |
8efc0c15 | 70 | } SocketEntry; |
71 | ||
1e3b8b07 | 72 | u_int sockets_alloc = 0; |
8efc0c15 | 73 | SocketEntry *sockets = NULL; |
74 | ||
95f0a918 | 75 | typedef struct identity { |
76 | TAILQ_ENTRY(identity) next; | |
2e73a022 | 77 | Key *key; |
5260325f | 78 | char *comment; |
264572cc | 79 | u_int death; |
8efc0c15 | 80 | } Identity; |
81 | ||
2e73a022 | 82 | typedef struct { |
83 | int nentries; | |
95f0a918 | 84 | TAILQ_HEAD(idqueue, identity) idlist; |
2e73a022 | 85 | } Idtab; |
86 | ||
87 | /* private key table, one per protocol version */ | |
88 | Idtab idtable[3]; | |
8efc0c15 | 89 | |
90 | int max_fd = 0; | |
91 | ||
92 | /* pid of shell == parent of agent */ | |
9da5c3c9 | 93 | pid_t parent_pid = -1; |
8efc0c15 | 94 | |
95 | /* pathname and directory for AUTH_SOCKET */ | |
96 | char socket_name[1024]; | |
97 | char socket_dir[1024]; | |
98 | ||
3db7f994 | 99 | /* locking */ |
100 | int locked = 0; | |
101 | char *lock_passwd = NULL; | |
102 | ||
5260325f | 103 | #ifdef HAVE___PROGNAME |
104 | extern char *__progname; | |
260d427b | 105 | #else |
106 | char *__progname; | |
107 | #endif | |
5260325f | 108 | |
494b267f | 109 | /* Default lifetime (0 == forever) */ |
110 | static int lifetime = 0; | |
111 | ||
c1a4eef1 | 112 | static void |
113 | close_socket(SocketEntry *e) | |
114 | { | |
c1a4eef1 | 115 | close(e->fd); |
116 | e->fd = -1; | |
117 | e->type = AUTH_UNUSED; | |
118 | buffer_free(&e->input); | |
119 | buffer_free(&e->output); | |
120 | buffer_free(&e->request); | |
121 | } | |
122 | ||
396c147e | 123 | static void |
2e73a022 | 124 | idtab_init(void) |
125 | { | |
126 | int i; | |
e424e241 | 127 | |
6aacefa7 | 128 | for (i = 0; i <=2; i++) { |
95f0a918 | 129 | TAILQ_INIT(&idtable[i].idlist); |
2e73a022 | 130 | idtable[i].nentries = 0; |
131 | } | |
132 | } | |
133 | ||
134 | /* return private key table for requested protocol version */ | |
396c147e | 135 | static Idtab * |
2e73a022 | 136 | idtab_lookup(int version) |
137 | { | |
138 | if (version < 1 || version > 2) | |
139 | fatal("internal error, bad protocol version %d", version); | |
140 | return &idtable[version]; | |
141 | } | |
142 | ||
264572cc | 143 | static void |
144 | free_identity(Identity *id) | |
145 | { | |
146 | key_free(id->key); | |
147 | xfree(id->comment); | |
148 | xfree(id); | |
149 | } | |
150 | ||
2e73a022 | 151 | /* return matching private key for given public key */ |
95f0a918 | 152 | static Identity * |
153 | lookup_identity(Key *key, int version) | |
2e73a022 | 154 | { |
95f0a918 | 155 | Identity *id; |
156 | ||
2e73a022 | 157 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 158 | TAILQ_FOREACH(id, &tab->idlist, next) { |
159 | if (key_equal(key, id->key)) | |
160 | return (id); | |
2e73a022 | 161 | } |
95f0a918 | 162 | return (NULL); |
163 | } | |
164 | ||
2e73a022 | 165 | /* send list of supported public keys to 'client' */ |
396c147e | 166 | static void |
2e73a022 | 167 | process_request_identities(SocketEntry *e, int version) |
8efc0c15 | 168 | { |
2e73a022 | 169 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 170 | Identity *id; |
e424e241 | 171 | Buffer msg; |
5260325f | 172 | |
173 | buffer_init(&msg); | |
2e73a022 | 174 | buffer_put_char(&msg, (version == 1) ? |
175 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
176 | buffer_put_int(&msg, tab->nentries); | |
95f0a918 | 177 | TAILQ_FOREACH(id, &tab->idlist, next) { |
fa08c86b | 178 | if (id->key->type == KEY_RSA1) { |
2e73a022 | 179 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
180 | buffer_put_bignum(&msg, id->key->rsa->e); | |
181 | buffer_put_bignum(&msg, id->key->rsa->n); | |
182 | } else { | |
1e3b8b07 | 183 | u_char *blob; |
184 | u_int blen; | |
fa08c86b | 185 | key_to_blob(id->key, &blob, &blen); |
2e73a022 | 186 | buffer_put_string(&msg, blob, blen); |
187 | xfree(blob); | |
188 | } | |
189 | buffer_put_cstring(&msg, id->comment); | |
5260325f | 190 | } |
191 | buffer_put_int(&e->output, buffer_len(&msg)); | |
192 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
193 | buffer_free(&msg); | |
8efc0c15 | 194 | } |
195 | ||
2e73a022 | 196 | /* ssh1 only */ |
396c147e | 197 | static void |
2e73a022 | 198 | process_authentication_challenge1(SocketEntry *e) |
8efc0c15 | 199 | { |
e424e241 | 200 | u_char buf[32], mdbuf[16], session_id[16]; |
201 | u_int response_type; | |
2e73a022 | 202 | BIGNUM *challenge; |
e424e241 | 203 | Identity *id; |
2e73a022 | 204 | int i, len; |
5260325f | 205 | Buffer msg; |
206 | MD5_CTX md; | |
e424e241 | 207 | Key *key; |
5260325f | 208 | |
209 | buffer_init(&msg); | |
fa08c86b | 210 | key = key_new(KEY_RSA1); |
b775c6f2 | 211 | if ((challenge = BN_new()) == NULL) |
212 | fatal("process_authentication_challenge1: BN_new failed"); | |
5260325f | 213 | |
1169c3df | 214 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 215 | buffer_get_bignum(&e->request, key->rsa->e); |
216 | buffer_get_bignum(&e->request, key->rsa->n); | |
217 | buffer_get_bignum(&e->request, challenge); | |
5260325f | 218 | |
2e73a022 | 219 | /* Only protocol 1.1 is supported */ |
b9dd5ca1 | 220 | if (buffer_len(&e->request) == 0) |
2e73a022 | 221 | goto failure; |
b9dd5ca1 | 222 | buffer_get(&e->request, session_id, 16); |
223 | response_type = buffer_get_int(&e->request); | |
2e73a022 | 224 | if (response_type != 1) |
225 | goto failure; | |
226 | ||
95f0a918 | 227 | id = lookup_identity(key, 1); |
228 | if (id != NULL) { | |
229 | Key *private = id->key; | |
2e73a022 | 230 | /* Decrypt the challenge using the private key. */ |
46aa2d1f | 231 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
232 | goto failure; | |
2e73a022 | 233 | |
234 | /* The response is MD5 of decrypted challenge plus session id. */ | |
235 | len = BN_num_bytes(challenge); | |
236 | if (len <= 0 || len > 32) { | |
237 | log("process_authentication_challenge: bad challenge length %d", len); | |
238 | goto failure; | |
5260325f | 239 | } |
2e73a022 | 240 | memset(buf, 0, 32); |
241 | BN_bn2bin(challenge, buf + 32 - len); | |
242 | MD5_Init(&md); | |
243 | MD5_Update(&md, buf, 32); | |
244 | MD5_Update(&md, session_id, 16); | |
245 | MD5_Final(mdbuf, &md); | |
246 | ||
247 | /* Send the response. */ | |
248 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
249 | for (i = 0; i < 16; i++) | |
250 | buffer_put_char(&msg, mdbuf[i]); | |
251 | goto send; | |
252 | } | |
253 | ||
254 | failure: | |
255 | /* Unknown identity or protocol error. Send failure. */ | |
5260325f | 256 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
257 | send: | |
2e73a022 | 258 | buffer_put_int(&e->output, buffer_len(&msg)); |
259 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
260 | key_free(key); | |
261 | BN_clear_free(challenge); | |
262 | buffer_free(&msg); | |
263 | } | |
264 | ||
265 | /* ssh2 only */ | |
396c147e | 266 | static void |
2e73a022 | 267 | process_sign_request2(SocketEntry *e) |
268 | { | |
1e3b8b07 | 269 | u_char *blob, *data, *signature = NULL; |
270 | u_int blen, dlen, slen = 0; | |
e424e241 | 271 | extern int datafellows; |
272 | int ok = -1, flags; | |
2e73a022 | 273 | Buffer msg; |
e424e241 | 274 | Key *key; |
2e73a022 | 275 | |
276 | datafellows = 0; | |
227e8e86 | 277 | |
b9dd5ca1 | 278 | blob = buffer_get_string(&e->request, &blen); |
279 | data = buffer_get_string(&e->request, &dlen); | |
188adeb2 | 280 | |
b9dd5ca1 | 281 | flags = buffer_get_int(&e->request); |
188adeb2 | 282 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
283 | datafellows = SSH_BUG_SIGBLOB; | |
2e73a022 | 284 | |
fa08c86b | 285 | key = key_from_blob(blob, blen); |
2e73a022 | 286 | if (key != NULL) { |
95f0a918 | 287 | Identity *id = lookup_identity(key, 2); |
288 | if (id != NULL) | |
289 | ok = key_sign(id->key, &signature, &slen, data, dlen); | |
2e73a022 | 290 | } |
291 | key_free(key); | |
292 | buffer_init(&msg); | |
293 | if (ok == 0) { | |
294 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
295 | buffer_put_string(&msg, signature, slen); | |
296 | } else { | |
297 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
298 | } | |
5260325f | 299 | buffer_put_int(&e->output, buffer_len(&msg)); |
300 | buffer_append(&e->output, buffer_ptr(&msg), | |
2e73a022 | 301 | buffer_len(&msg)); |
5260325f | 302 | buffer_free(&msg); |
2e73a022 | 303 | xfree(data); |
304 | xfree(blob); | |
305 | if (signature != NULL) | |
306 | xfree(signature); | |
8efc0c15 | 307 | } |
308 | ||
2e73a022 | 309 | /* shared */ |
396c147e | 310 | static void |
2e73a022 | 311 | process_remove_identity(SocketEntry *e, int version) |
8efc0c15 | 312 | { |
e424e241 | 313 | u_int blen, bits; |
314 | int success = 0; | |
95f0a918 | 315 | Key *key = NULL; |
1e3b8b07 | 316 | u_char *blob; |
2e73a022 | 317 | |
6aacefa7 | 318 | switch (version) { |
2e73a022 | 319 | case 1: |
fa08c86b | 320 | key = key_new(KEY_RSA1); |
b9dd5ca1 | 321 | bits = buffer_get_int(&e->request); |
322 | buffer_get_bignum(&e->request, key->rsa->e); | |
323 | buffer_get_bignum(&e->request, key->rsa->n); | |
2e73a022 | 324 | |
325 | if (bits != key_size(key)) | |
e424e241 | 326 | log("Warning: identity keysize mismatch: actual %u, announced %u", |
42f11eb2 | 327 | key_size(key), bits); |
2e73a022 | 328 | break; |
329 | case 2: | |
b9dd5ca1 | 330 | blob = buffer_get_string(&e->request, &blen); |
fa08c86b | 331 | key = key_from_blob(blob, blen); |
2e73a022 | 332 | xfree(blob); |
333 | break; | |
334 | } | |
335 | if (key != NULL) { | |
95f0a918 | 336 | Identity *id = lookup_identity(key, version); |
337 | if (id != NULL) { | |
aa3378df | 338 | /* |
339 | * We have this key. Free the old key. Since we | |
340 | * don\'t want to leave empty slots in the middle of | |
d343d900 | 341 | * the array, we actually free the key there and move |
342 | * all the entries between the empty slot and the end | |
343 | * of the array. | |
aa3378df | 344 | */ |
2e73a022 | 345 | Idtab *tab = idtab_lookup(version); |
fa08c86b | 346 | if (tab->nentries < 1) |
347 | fatal("process_remove_identity: " | |
348 | "internal error: tab->nentries %d", | |
349 | tab->nentries); | |
95f0a918 | 350 | TAILQ_REMOVE(&tab->idlist, id, next); |
351 | free_identity(id); | |
2e73a022 | 352 | tab->nentries--; |
353 | success = 1; | |
5260325f | 354 | } |
2e73a022 | 355 | key_free(key); |
356 | } | |
8efc0c15 | 357 | buffer_put_int(&e->output, 1); |
2e73a022 | 358 | buffer_put_char(&e->output, |
359 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 360 | } |
361 | ||
396c147e | 362 | static void |
2e73a022 | 363 | process_remove_all_identities(SocketEntry *e, int version) |
8efc0c15 | 364 | { |
2e73a022 | 365 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 366 | Identity *id; |
8efc0c15 | 367 | |
5260325f | 368 | /* Loop over all identities and clear the keys. */ |
95f0a918 | 369 | for (id = TAILQ_FIRST(&tab->idlist); id; |
370 | id = TAILQ_FIRST(&tab->idlist)) { | |
371 | TAILQ_REMOVE(&tab->idlist, id, next); | |
372 | free_identity(id); | |
5260325f | 373 | } |
8efc0c15 | 374 | |
5260325f | 375 | /* Mark that there are no identities. */ |
2e73a022 | 376 | tab->nentries = 0; |
8efc0c15 | 377 | |
378 | /* Send success. */ | |
379 | buffer_put_int(&e->output, 1); | |
380 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
5260325f | 381 | } |
382 | ||
264572cc | 383 | static void |
384 | reaper(void) | |
385 | { | |
e424e241 | 386 | u_int now = time(NULL); |
264572cc | 387 | Identity *id, *nxt; |
388 | int version; | |
e424e241 | 389 | Idtab *tab; |
264572cc | 390 | |
391 | for (version = 1; version < 3; version++) { | |
392 | tab = idtab_lookup(version); | |
393 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
394 | nxt = TAILQ_NEXT(id, next); | |
395 | if (id->death != 0 && now >= id->death) { | |
396 | TAILQ_REMOVE(&tab->idlist, id, next); | |
397 | free_identity(id); | |
398 | tab->nentries--; | |
399 | } | |
400 | } | |
401 | } | |
402 | } | |
403 | ||
396c147e | 404 | static void |
fa08c86b | 405 | process_add_identity(SocketEntry *e, int version) |
406 | { | |
2e73a022 | 407 | Idtab *tab = idtab_lookup(version); |
e424e241 | 408 | int type, success = 0, death = 0; |
409 | char *type_name, *comment; | |
410 | Key *k = NULL; | |
5260325f | 411 | |
2e73a022 | 412 | switch (version) { |
413 | case 1: | |
fa08c86b | 414 | k = key_new_private(KEY_RSA1); |
1169c3df | 415 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 416 | buffer_get_bignum(&e->request, k->rsa->n); |
417 | buffer_get_bignum(&e->request, k->rsa->e); | |
418 | buffer_get_bignum(&e->request, k->rsa->d); | |
419 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
2e73a022 | 420 | |
421 | /* SSH and SSL have p and q swapped */ | |
b9dd5ca1 | 422 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
423 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
2e73a022 | 424 | |
425 | /* Generate additional parameters */ | |
2b63e803 | 426 | rsa_generate_additional_parameters(k->rsa); |
2e73a022 | 427 | break; |
428 | case 2: | |
b9dd5ca1 | 429 | type_name = buffer_get_string(&e->request, NULL); |
42f11eb2 | 430 | type = key_type_from_name(type_name); |
fa08c86b | 431 | xfree(type_name); |
6aacefa7 | 432 | switch (type) { |
fa08c86b | 433 | case KEY_DSA: |
434 | k = key_new_private(type); | |
b9dd5ca1 | 435 | buffer_get_bignum2(&e->request, k->dsa->p); |
436 | buffer_get_bignum2(&e->request, k->dsa->q); | |
437 | buffer_get_bignum2(&e->request, k->dsa->g); | |
438 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
439 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
fa08c86b | 440 | break; |
441 | case KEY_RSA: | |
442 | k = key_new_private(type); | |
b9dd5ca1 | 443 | buffer_get_bignum2(&e->request, k->rsa->n); |
444 | buffer_get_bignum2(&e->request, k->rsa->e); | |
445 | buffer_get_bignum2(&e->request, k->rsa->d); | |
446 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
447 | buffer_get_bignum2(&e->request, k->rsa->p); | |
448 | buffer_get_bignum2(&e->request, k->rsa->q); | |
fa08c86b | 449 | |
450 | /* Generate additional parameters */ | |
2b63e803 | 451 | rsa_generate_additional_parameters(k->rsa); |
fa08c86b | 452 | break; |
453 | default: | |
b9dd5ca1 | 454 | buffer_clear(&e->request); |
2e73a022 | 455 | goto send; |
5260325f | 456 | } |
2e73a022 | 457 | break; |
458 | } | |
b9dd5ca1 | 459 | comment = buffer_get_string(&e->request, NULL); |
2e73a022 | 460 | if (k == NULL) { |
461 | xfree(comment); | |
462 | goto send; | |
463 | } | |
464 | success = 1; | |
ee900f87 | 465 | while (buffer_len(&e->request)) { |
466 | switch (buffer_get_char(&e->request)) { | |
467 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
468 | death = time(NULL) + buffer_get_int(&e->request); | |
469 | break; | |
470 | default: | |
471 | break; | |
472 | } | |
473 | } | |
494b267f | 474 | if (lifetime && !death) |
475 | death = time(NULL) + lifetime; | |
95f0a918 | 476 | if (lookup_identity(k, version) == NULL) { |
477 | Identity *id = xmalloc(sizeof(Identity)); | |
478 | id->key = k; | |
479 | id->comment = comment; | |
ee900f87 | 480 | id->death = death; |
95f0a918 | 481 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
2e73a022 | 482 | /* Increment the number of identities. */ |
483 | tab->nentries++; | |
484 | } else { | |
485 | key_free(k); | |
486 | xfree(comment); | |
487 | } | |
488 | send: | |
5260325f | 489 | buffer_put_int(&e->output, 1); |
2e73a022 | 490 | buffer_put_char(&e->output, |
491 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 492 | } |
493 | ||
3db7f994 | 494 | /* XXX todo: encrypt sensitive data with passphrase */ |
495 | static void | |
496 | process_lock_agent(SocketEntry *e, int lock) | |
497 | { | |
3db7f994 | 498 | int success = 0; |
e424e241 | 499 | char *passwd; |
3db7f994 | 500 | |
501 | passwd = buffer_get_string(&e->request, NULL); | |
502 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
503 | locked = 0; | |
504 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
505 | xfree(lock_passwd); | |
506 | lock_passwd = NULL; | |
507 | success = 1; | |
508 | } else if (!locked && lock) { | |
509 | locked = 1; | |
510 | lock_passwd = xstrdup(passwd); | |
511 | success = 1; | |
512 | } | |
513 | memset(passwd, 0, strlen(passwd)); | |
514 | xfree(passwd); | |
7203d6bb | 515 | |
3db7f994 | 516 | buffer_put_int(&e->output, 1); |
517 | buffer_put_char(&e->output, | |
518 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
3db7f994 | 519 | } |
520 | ||
521 | static void | |
522 | no_identities(SocketEntry *e, u_int type) | |
523 | { | |
524 | Buffer msg; | |
525 | ||
526 | buffer_init(&msg); | |
527 | buffer_put_char(&msg, | |
528 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
529 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
530 | buffer_put_int(&msg, 0); | |
531 | buffer_put_int(&e->output, buffer_len(&msg)); | |
532 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
533 | buffer_free(&msg); | |
534 | } | |
2b5fe3b8 | 535 | |
536 | #ifdef SMARTCARD | |
537 | static void | |
538 | process_add_smartcard_key (SocketEntry *e) | |
539 | { | |
76139bd8 | 540 | char *sc_reader_id = NULL, *pin; |
0659cace | 541 | int i, version, success = 0; |
e424e241 | 542 | Key **keys, *k; |
543 | Identity *id; | |
544 | Idtab *tab; | |
184eed6a | 545 | |
b9dd5ca1 | 546 | sc_reader_id = buffer_get_string(&e->request, NULL); |
547 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 548 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 549 | xfree(sc_reader_id); |
76139bd8 | 550 | xfree(pin); |
2b5fe3b8 | 551 | |
0659cace | 552 | if (keys == NULL || keys[0] == NULL) { |
553 | error("sc_get_keys failed"); | |
2b5fe3b8 | 554 | goto send; |
555 | } | |
0659cace | 556 | for (i = 0; keys[i] != NULL; i++) { |
557 | k = keys[i]; | |
558 | version = k->type == KEY_RSA1 ? 1 : 2; | |
559 | tab = idtab_lookup(version); | |
560 | if (lookup_identity(k, version) == NULL) { | |
561 | id = xmalloc(sizeof(Identity)); | |
562 | id->key = k; | |
563 | id->comment = xstrdup("smartcard key"); | |
264572cc | 564 | id->death = 0; |
0659cace | 565 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
566 | tab->nentries++; | |
567 | success = 1; | |
568 | } else { | |
569 | key_free(k); | |
570 | } | |
571 | keys[i] = NULL; | |
2b5fe3b8 | 572 | } |
0659cace | 573 | xfree(keys); |
2b5fe3b8 | 574 | send: |
575 | buffer_put_int(&e->output, 1); | |
576 | buffer_put_char(&e->output, | |
577 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
578 | } | |
579 | ||
580 | static void | |
581 | process_remove_smartcard_key(SocketEntry *e) | |
582 | { | |
76139bd8 | 583 | char *sc_reader_id = NULL, *pin; |
0659cace | 584 | int i, version, success = 0; |
e424e241 | 585 | Key **keys, *k = NULL; |
586 | Identity *id; | |
587 | Idtab *tab; | |
2b5fe3b8 | 588 | |
b9dd5ca1 | 589 | sc_reader_id = buffer_get_string(&e->request, NULL); |
590 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 591 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 592 | xfree(sc_reader_id); |
76139bd8 | 593 | xfree(pin); |
2b5fe3b8 | 594 | |
0659cace | 595 | if (keys == NULL || keys[0] == NULL) { |
596 | error("sc_get_keys failed"); | |
597 | goto send; | |
598 | } | |
599 | for (i = 0; keys[i] != NULL; i++) { | |
600 | k = keys[i]; | |
601 | version = k->type == KEY_RSA1 ? 1 : 2; | |
602 | if ((id = lookup_identity(k, version)) != NULL) { | |
603 | tab = idtab_lookup(version); | |
875ec275 | 604 | TAILQ_REMOVE(&tab->idlist, id, next); |
2b5fe3b8 | 605 | tab->nentries--; |
95f0a918 | 606 | free_identity(id); |
2b5fe3b8 | 607 | success = 1; |
608 | } | |
609 | key_free(k); | |
0659cace | 610 | keys[i] = NULL; |
2b5fe3b8 | 611 | } |
0659cace | 612 | xfree(keys); |
613 | send: | |
2b5fe3b8 | 614 | buffer_put_int(&e->output, 1); |
615 | buffer_put_char(&e->output, | |
616 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
617 | } | |
3e984472 | 618 | #endif /* SMARTCARD */ |
2b5fe3b8 | 619 | |
2e73a022 | 620 | /* dispatch incoming messages */ |
621 | ||
396c147e | 622 | static void |
8efc0c15 | 623 | process_message(SocketEntry *e) |
624 | { | |
e424e241 | 625 | u_int msg_len, type; |
1e3b8b07 | 626 | u_char *cp; |
264572cc | 627 | |
628 | /* kill dead keys */ | |
629 | reaper(); | |
630 | ||
5260325f | 631 | if (buffer_len(&e->input) < 5) |
632 | return; /* Incomplete message. */ | |
20905a8e | 633 | cp = buffer_ptr(&e->input); |
5260325f | 634 | msg_len = GET_32BIT(cp); |
635 | if (msg_len > 256 * 1024) { | |
c1a4eef1 | 636 | close_socket(e); |
5260325f | 637 | return; |
638 | } | |
639 | if (buffer_len(&e->input) < msg_len + 4) | |
640 | return; | |
b9dd5ca1 | 641 | |
642 | /* move the current input to e->request */ | |
5260325f | 643 | buffer_consume(&e->input, 4); |
b9dd5ca1 | 644 | buffer_clear(&e->request); |
645 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
646 | buffer_consume(&e->input, msg_len); | |
647 | type = buffer_get_char(&e->request); | |
5260325f | 648 | |
3db7f994 | 649 | /* check wheter agent is locked */ |
650 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
651 | buffer_clear(&e->request); | |
652 | switch (type) { | |
653 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
654 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
655 | /* send empty lists */ | |
656 | no_identities(e, type); | |
657 | break; | |
658 | default: | |
659 | /* send a fail message for all other request types */ | |
660 | buffer_put_int(&e->output, 1); | |
661 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
662 | } | |
663 | return; | |
664 | } | |
665 | ||
2b5fe3b8 | 666 | debug("type %d", type); |
5260325f | 667 | switch (type) { |
3db7f994 | 668 | case SSH_AGENTC_LOCK: |
669 | case SSH_AGENTC_UNLOCK: | |
670 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
671 | break; | |
2e73a022 | 672 | /* ssh1 */ |
5260325f | 673 | case SSH_AGENTC_RSA_CHALLENGE: |
2e73a022 | 674 | process_authentication_challenge1(e); |
675 | break; | |
676 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
677 | process_request_identities(e, 1); | |
5260325f | 678 | break; |
679 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
ee900f87 | 680 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
2e73a022 | 681 | process_add_identity(e, 1); |
5260325f | 682 | break; |
683 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
2e73a022 | 684 | process_remove_identity(e, 1); |
5260325f | 685 | break; |
686 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
2e73a022 | 687 | process_remove_all_identities(e, 1); |
688 | break; | |
689 | /* ssh2 */ | |
690 | case SSH2_AGENTC_SIGN_REQUEST: | |
691 | process_sign_request2(e); | |
692 | break; | |
693 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
694 | process_request_identities(e, 2); | |
695 | break; | |
696 | case SSH2_AGENTC_ADD_IDENTITY: | |
ee900f87 | 697 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
2e73a022 | 698 | process_add_identity(e, 2); |
699 | break; | |
700 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
701 | process_remove_identity(e, 2); | |
702 | break; | |
703 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
704 | process_remove_all_identities(e, 2); | |
5260325f | 705 | break; |
2b5fe3b8 | 706 | #ifdef SMARTCARD |
707 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
708 | process_add_smartcard_key(e); | |
184eed6a | 709 | break; |
2b5fe3b8 | 710 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
711 | process_remove_smartcard_key(e); | |
184eed6a | 712 | break; |
3e984472 | 713 | #endif /* SMARTCARD */ |
5260325f | 714 | default: |
715 | /* Unknown message. Respond with failure. */ | |
716 | error("Unknown message %d", type); | |
b9dd5ca1 | 717 | buffer_clear(&e->request); |
5260325f | 718 | buffer_put_int(&e->output, 1); |
719 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
720 | break; | |
721 | } | |
8efc0c15 | 722 | } |
723 | ||
396c147e | 724 | static void |
17a3011c | 725 | new_socket(sock_type type, int fd) |
8efc0c15 | 726 | { |
1e3b8b07 | 727 | u_int i, old_alloc; |
e424e241 | 728 | |
5260325f | 729 | if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
730 | error("fcntl O_NONBLOCK: %s", strerror(errno)); | |
731 | ||
732 | if (fd > max_fd) | |
733 | max_fd = fd; | |
734 | ||
735 | for (i = 0; i < sockets_alloc; i++) | |
736 | if (sockets[i].type == AUTH_UNUSED) { | |
737 | sockets[i].fd = fd; | |
738 | sockets[i].type = type; | |
739 | buffer_init(&sockets[i].input); | |
740 | buffer_init(&sockets[i].output); | |
b9dd5ca1 | 741 | buffer_init(&sockets[i].request); |
5260325f | 742 | return; |
743 | } | |
744 | old_alloc = sockets_alloc; | |
745 | sockets_alloc += 10; | |
746 | if (sockets) | |
747 | sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0])); | |
748 | else | |
749 | sockets = xmalloc(sockets_alloc * sizeof(sockets[0])); | |
750 | for (i = old_alloc; i < sockets_alloc; i++) | |
751 | sockets[i].type = AUTH_UNUSED; | |
752 | sockets[old_alloc].type = type; | |
753 | sockets[old_alloc].fd = fd; | |
754 | buffer_init(&sockets[old_alloc].input); | |
755 | buffer_init(&sockets[old_alloc].output); | |
b9dd5ca1 | 756 | buffer_init(&sockets[old_alloc].request); |
8efc0c15 | 757 | } |
758 | ||
396c147e | 759 | static int |
e364646f | 760 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, int *nallocp) |
8efc0c15 | 761 | { |
42f11eb2 | 762 | u_int i, sz; |
763 | int n = 0; | |
764 | ||
765 | for (i = 0; i < sockets_alloc; i++) { | |
5260325f | 766 | switch (sockets[i].type) { |
767 | case AUTH_SOCKET: | |
768 | case AUTH_CONNECTION: | |
42f11eb2 | 769 | n = MAX(n, sockets[i].fd); |
5260325f | 770 | break; |
771 | case AUTH_UNUSED: | |
772 | break; | |
773 | default: | |
774 | fatal("Unknown socket type %d", sockets[i].type); | |
775 | break; | |
776 | } | |
42f11eb2 | 777 | } |
778 | ||
779 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
e364646f | 780 | if (*fdrp == NULL || sz > *nallocp) { |
42f11eb2 | 781 | if (*fdrp) |
894c5fa6 | 782 | xfree(*fdrp); |
42f11eb2 | 783 | if (*fdwp) |
894c5fa6 | 784 | xfree(*fdwp); |
42f11eb2 | 785 | *fdrp = xmalloc(sz); |
786 | *fdwp = xmalloc(sz); | |
e364646f | 787 | *nallocp = sz; |
42f11eb2 | 788 | } |
e364646f | 789 | if (n < *fdl) |
790 | debug("XXX shrink: %d < %d", n, *fdl); | |
791 | *fdl = n; | |
42f11eb2 | 792 | memset(*fdrp, 0, sz); |
793 | memset(*fdwp, 0, sz); | |
794 | ||
795 | for (i = 0; i < sockets_alloc; i++) { | |
796 | switch (sockets[i].type) { | |
797 | case AUTH_SOCKET: | |
798 | case AUTH_CONNECTION: | |
799 | FD_SET(sockets[i].fd, *fdrp); | |
800 | if (buffer_len(&sockets[i].output) > 0) | |
801 | FD_SET(sockets[i].fd, *fdwp); | |
802 | break; | |
803 | default: | |
804 | break; | |
805 | } | |
806 | } | |
807 | return (1); | |
8efc0c15 | 808 | } |
809 | ||
396c147e | 810 | static void |
5260325f | 811 | after_select(fd_set *readset, fd_set *writeset) |
8efc0c15 | 812 | { |
e424e241 | 813 | struct sockaddr_un sunaddr; |
610cd5c6 | 814 | socklen_t slen; |
5260325f | 815 | char buf[1024]; |
e424e241 | 816 | int len, sock; |
817 | u_int i; | |
87f4111f | 818 | uid_t euid; |
819 | gid_t egid; | |
5260325f | 820 | |
821 | for (i = 0; i < sockets_alloc; i++) | |
822 | switch (sockets[i].type) { | |
823 | case AUTH_UNUSED: | |
824 | break; | |
825 | case AUTH_SOCKET: | |
826 | if (FD_ISSET(sockets[i].fd, readset)) { | |
610cd5c6 | 827 | slen = sizeof(sunaddr); |
42f11eb2 | 828 | sock = accept(sockets[i].fd, |
829 | (struct sockaddr *) &sunaddr, &slen); | |
5260325f | 830 | if (sock < 0) { |
fccfbe3b | 831 | error("accept from AUTH_SOCKET: %s", |
832 | strerror(errno)); | |
5260325f | 833 | break; |
834 | } | |
87f4111f | 835 | if (getpeereid(sock, &euid, &egid) < 0) { |
836 | error("getpeereid %d failed: %s", | |
837 | sock, strerror(errno)); | |
838 | close(sock); | |
839 | break; | |
840 | } | |
e139021d | 841 | if ((euid != 0) && (getuid() != euid)) { |
87f4111f | 842 | error("uid mismatch: " |
792e7d2d | 843 | "peer euid %u != uid %u", |
844 | (u_int) euid, (u_int) getuid()); | |
87f4111f | 845 | close(sock); |
846 | break; | |
847 | } | |
5260325f | 848 | new_socket(AUTH_CONNECTION, sock); |
849 | } | |
850 | break; | |
851 | case AUTH_CONNECTION: | |
852 | if (buffer_len(&sockets[i].output) > 0 && | |
853 | FD_ISSET(sockets[i].fd, writeset)) { | |
bbc62e59 | 854 | do { |
855 | len = write(sockets[i].fd, | |
856 | buffer_ptr(&sockets[i].output), | |
857 | buffer_len(&sockets[i].output)); | |
858 | if (len == -1 && (errno == EAGAIN || | |
859 | errno == EINTR)) | |
860 | continue; | |
861 | break; | |
862 | } while (1); | |
5260325f | 863 | if (len <= 0) { |
c1a4eef1 | 864 | close_socket(&sockets[i]); |
5260325f | 865 | break; |
866 | } | |
867 | buffer_consume(&sockets[i].output, len); | |
868 | } | |
869 | if (FD_ISSET(sockets[i].fd, readset)) { | |
bbc62e59 | 870 | do { |
871 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
872 | if (len == -1 && (errno == EAGAIN || | |
873 | errno == EINTR)) | |
874 | continue; | |
875 | break; | |
876 | } while (1); | |
5260325f | 877 | if (len <= 0) { |
c1a4eef1 | 878 | close_socket(&sockets[i]); |
5260325f | 879 | break; |
880 | } | |
881 | buffer_append(&sockets[i].input, buf, len); | |
882 | process_message(&sockets[i]); | |
883 | } | |
884 | break; | |
885 | default: | |
886 | fatal("Unknown type %d", sockets[i].type); | |
887 | } | |
8efc0c15 | 888 | } |
889 | ||
396c147e | 890 | static void |
fccfbe3b | 891 | cleanup_socket(void *p) |
dae3fa13 | 892 | { |
2f4b2e38 | 893 | if (socket_name[0]) |
894 | unlink(socket_name); | |
895 | if (socket_dir[0]) | |
896 | rmdir(socket_dir); | |
8efc0c15 | 897 | } |
898 | ||
396c147e | 899 | static void |
dae3fa13 | 900 | cleanup_exit(int i) |
901 | { | |
fccfbe3b | 902 | cleanup_socket(NULL); |
5260325f | 903 | exit(i); |
dae3fa13 | 904 | } |
905 | ||
396c147e | 906 | static void |
2f4b2e38 | 907 | cleanup_handler(int sig) |
908 | { | |
fccfbe3b | 909 | cleanup_socket(NULL); |
2f4b2e38 | 910 | _exit(2); |
911 | } | |
912 | ||
7efa8482 | 913 | static void |
914 | check_parent_exists(int sig) | |
915 | { | |
916 | int save_errno = errno; | |
917 | ||
918 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
919 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
920 | cleanup_handler(sig); /* safe */ | |
921 | } | |
922 | signal(SIGALRM, check_parent_exists); | |
923 | alarm(10); | |
924 | errno = save_errno; | |
925 | } | |
926 | ||
396c147e | 927 | static void |
cc8aca8a | 928 | usage(void) |
dae3fa13 | 929 | { |
33e766d2 | 930 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", |
0e3c1f95 | 931 | __progname); |
33e766d2 | 932 | fprintf(stderr, "Options:\n"); |
933 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
934 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
935 | fprintf(stderr, " -k Kill the current agent.\n"); | |
936 | fprintf(stderr, " -d Debug mode.\n"); | |
3e7efb37 | 937 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
494b267f | 938 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); |
5260325f | 939 | exit(1); |
dae3fa13 | 940 | } |
941 | ||
8efc0c15 | 942 | int |
943 | main(int ac, char **av) | |
944 | { | |
e364646f | 945 | int sock, c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0, ch, nalloc; |
e424e241 | 946 | char *shell, *format, *pidstr, *agentsocket = NULL; |
947 | fd_set *readsetp = NULL, *writesetp = NULL; | |
5260325f | 948 | struct sockaddr_un sunaddr; |
b03bd394 | 949 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 950 | struct rlimit rlim; |
c7ccfd39 | 951 | #endif |
952 | #ifdef HAVE_CYGWIN | |
953 | int prev_mask; | |
b03bd394 | 954 | #endif |
c04f75f1 | 955 | extern int optind; |
ef3912be | 956 | extern char *optarg; |
e424e241 | 957 | pid_t pid; |
958 | char pidstrbuf[1 + 3 * sizeof pid]; | |
fcb975eb | 959 | |
954640a4 | 960 | /* drop */ |
961 | setegid(getgid()); | |
962 | setgid(getgid()); | |
963 | ||
457fc0c6 | 964 | SSLeay_add_all_algorithms(); |
965 | ||
260d427b | 966 | __progname = get_progname(av[0]); |
264dce47 | 967 | init_rng(); |
e339aa53 | 968 | seed_rng(); |
2b87da3b | 969 | |
494b267f | 970 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { |
5260325f | 971 | switch (ch) { |
972 | case 'c': | |
973 | if (s_flag) | |
974 | usage(); | |
975 | c_flag++; | |
976 | break; | |
977 | case 'k': | |
978 | k_flag++; | |
979 | break; | |
980 | case 's': | |
981 | if (c_flag) | |
982 | usage(); | |
983 | s_flag++; | |
984 | break; | |
ffdb5d70 | 985 | case 'd': |
986 | if (d_flag) | |
987 | usage(); | |
988 | d_flag++; | |
989 | break; | |
3e7efb37 | 990 | case 'a': |
991 | agentsocket = optarg; | |
992 | break; | |
494b267f | 993 | case 't': |
994 | if ((lifetime = convtime(optarg)) == -1) { | |
995 | fprintf(stderr, "Invalid lifetime\n"); | |
996 | usage(); | |
997 | } | |
998 | break; | |
5260325f | 999 | default: |
1000 | usage(); | |
1001 | } | |
dae3fa13 | 1002 | } |
5260325f | 1003 | ac -= optind; |
1004 | av += optind; | |
1005 | ||
ffdb5d70 | 1006 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
5260325f | 1007 | usage(); |
1008 | ||
b745a2f2 | 1009 | if (ac == 0 && !c_flag && !s_flag) { |
5260325f | 1010 | shell = getenv("SHELL"); |
1011 | if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
1012 | c_flag = 1; | |
dae3fa13 | 1013 | } |
5260325f | 1014 | if (k_flag) { |
1015 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); | |
1016 | if (pidstr == NULL) { | |
1017 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
42f11eb2 | 1018 | SSH_AGENTPID_ENV_NAME); |
5260325f | 1019 | exit(1); |
1020 | } | |
1021 | pid = atoi(pidstr); | |
42f11eb2 | 1022 | if (pid < 1) { |
5260325f | 1023 | fprintf(stderr, "%s=\"%s\", which is not a good PID\n", |
42f11eb2 | 1024 | SSH_AGENTPID_ENV_NAME, pidstr); |
5260325f | 1025 | exit(1); |
1026 | } | |
1027 | if (kill(pid, SIGTERM) == -1) { | |
1028 | perror("kill"); | |
1029 | exit(1); | |
1030 | } | |
1031 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1032 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1033 | printf(format, SSH_AGENTPID_ENV_NAME); | |
c457707e | 1034 | printf("echo Agent pid %ld killed;\n", (long)pid); |
5260325f | 1035 | exit(0); |
dae3fa13 | 1036 | } |
5260325f | 1037 | parent_pid = getpid(); |
1038 | ||
3e7efb37 | 1039 | if (agentsocket == NULL) { |
1040 | /* Create private directory for agent socket */ | |
1041 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir); | |
1042 | if (mkdtemp(socket_dir) == NULL) { | |
1043 | perror("mkdtemp: private socket dir"); | |
1044 | exit(1); | |
1045 | } | |
c457707e | 1046 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
1047 | (long)parent_pid); | |
3e7efb37 | 1048 | } else { |
1049 | /* Try to use specified agent socket */ | |
1050 | socket_dir[0] = '\0'; | |
1051 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
5260325f | 1052 | } |
5260325f | 1053 | |
aa3378df | 1054 | /* |
1055 | * Create socket early so it will exist before command gets run from | |
1056 | * the parent. | |
1057 | */ | |
5260325f | 1058 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
1059 | if (sock < 0) { | |
1060 | perror("socket"); | |
1061 | cleanup_exit(1); | |
1062 | } | |
1063 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1064 | sunaddr.sun_family = AF_UNIX; | |
1065 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
c7ccfd39 | 1066 | #ifdef HAVE_CYGWIN |
1067 | prev_mask = umask(0177); | |
1068 | #endif | |
5260325f | 1069 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { |
1070 | perror("bind"); | |
c7ccfd39 | 1071 | #ifdef HAVE_CYGWIN |
1072 | umask(prev_mask); | |
1073 | #endif | |
5260325f | 1074 | cleanup_exit(1); |
1075 | } | |
c7ccfd39 | 1076 | #ifdef HAVE_CYGWIN |
1077 | umask(prev_mask); | |
1078 | #endif | |
00e41835 | 1079 | if (listen(sock, 128) < 0) { |
5260325f | 1080 | perror("listen"); |
1081 | cleanup_exit(1); | |
dae3fa13 | 1082 | } |
42f11eb2 | 1083 | |
aa3378df | 1084 | /* |
1085 | * Fork, and have the parent execute the command, if any, or present | |
1086 | * the socket data. The child continues as the authentication agent. | |
1087 | */ | |
ffdb5d70 | 1088 | if (d_flag) { |
1089 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1090 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1091 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1092 | SSH_AUTHSOCKET_ENV_NAME); | |
c457707e | 1093 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
ffdb5d70 | 1094 | goto skip; |
1095 | } | |
5260325f | 1096 | pid = fork(); |
1097 | if (pid == -1) { | |
1098 | perror("fork"); | |
fccfbe3b | 1099 | cleanup_exit(1); |
dae3fa13 | 1100 | } |
5260325f | 1101 | if (pid != 0) { /* Parent - execute the given command. */ |
1102 | close(sock); | |
c457707e | 1103 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
5260325f | 1104 | if (ac == 0) { |
1105 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1106 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
42f11eb2 | 1107 | SSH_AUTHSOCKET_ENV_NAME); |
5260325f | 1108 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
42f11eb2 | 1109 | SSH_AGENTPID_ENV_NAME); |
c457707e | 1110 | printf("echo Agent pid %ld;\n", (long)pid); |
5260325f | 1111 | exit(0); |
1112 | } | |
bcbf86ec | 1113 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
1114 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1115 | perror("setenv"); | |
1116 | exit(1); | |
1117 | } | |
5260325f | 1118 | execvp(av[0], av); |
1119 | perror(av[0]); | |
1120 | exit(1); | |
1121 | } | |
fccfbe3b | 1122 | /* child */ |
1123 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
ec9f3450 | 1124 | |
1125 | if (setsid() == -1) { | |
fccfbe3b | 1126 | error("setsid: %s", strerror(errno)); |
ec9f3450 | 1127 | cleanup_exit(1); |
1128 | } | |
1129 | ||
1130 | (void)chdir("/"); | |
5260325f | 1131 | close(0); |
1132 | close(1); | |
1133 | close(2); | |
dae3fa13 | 1134 | |
b03bd394 | 1135 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1136 | /* deny core dumps, since memory contains unencrypted private keys */ |
1137 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1138 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
fccfbe3b | 1139 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
0b6fbf03 | 1140 | cleanup_exit(1); |
1141 | } | |
b03bd394 | 1142 | #endif |
ffdb5d70 | 1143 | |
1144 | skip: | |
fccfbe3b | 1145 | fatal_add_cleanup(cleanup_socket, NULL); |
5260325f | 1146 | new_socket(AUTH_SOCKET, sock); |
1147 | if (ac > 0) { | |
1148 | signal(SIGALRM, check_parent_exists); | |
1149 | alarm(10); | |
1150 | } | |
2e73a022 | 1151 | idtab_init(); |
1ee482c5 | 1152 | if (!d_flag) |
ffdb5d70 | 1153 | signal(SIGINT, SIG_IGN); |
1ee482c5 | 1154 | signal(SIGPIPE, SIG_IGN); |
2f4b2e38 | 1155 | signal(SIGHUP, cleanup_handler); |
1156 | signal(SIGTERM, cleanup_handler); | |
e364646f | 1157 | nalloc = 0; |
1158 | ||
5260325f | 1159 | while (1) { |
e364646f | 1160 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); |
42f11eb2 | 1161 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { |
5260325f | 1162 | if (errno == EINTR) |
1163 | continue; | |
fccfbe3b | 1164 | fatal("select: %s", strerror(errno)); |
5260325f | 1165 | } |
42f11eb2 | 1166 | after_select(readsetp, writesetp); |
8efc0c15 | 1167 | } |
5260325f | 1168 | /* NOTREACHED */ |
8efc0c15 | 1169 | } |