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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" | |
187cd1fa | 37 | #include "openbsd-compat/fake-queue.h" |
405e0c5e | 38 | RCSID("$OpenBSD: ssh-agent.c,v 1.93 2002/06/15 00:07:38 markus 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 | |
396c147e | 109 | static void |
2e73a022 | 110 | idtab_init(void) |
111 | { | |
112 | int i; | |
6aacefa7 | 113 | for (i = 0; i <=2; i++) { |
95f0a918 | 114 | TAILQ_INIT(&idtable[i].idlist); |
2e73a022 | 115 | idtable[i].nentries = 0; |
116 | } | |
117 | } | |
118 | ||
119 | /* return private key table for requested protocol version */ | |
396c147e | 120 | static Idtab * |
2e73a022 | 121 | idtab_lookup(int version) |
122 | { | |
123 | if (version < 1 || version > 2) | |
124 | fatal("internal error, bad protocol version %d", version); | |
125 | return &idtable[version]; | |
126 | } | |
127 | ||
264572cc | 128 | static void |
129 | free_identity(Identity *id) | |
130 | { | |
131 | key_free(id->key); | |
132 | xfree(id->comment); | |
133 | xfree(id); | |
134 | } | |
135 | ||
2e73a022 | 136 | /* return matching private key for given public key */ |
95f0a918 | 137 | static Identity * |
138 | lookup_identity(Key *key, int version) | |
2e73a022 | 139 | { |
95f0a918 | 140 | Identity *id; |
141 | ||
2e73a022 | 142 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 143 | TAILQ_FOREACH(id, &tab->idlist, next) { |
144 | if (key_equal(key, id->key)) | |
145 | return (id); | |
2e73a022 | 146 | } |
95f0a918 | 147 | return (NULL); |
148 | } | |
149 | ||
2e73a022 | 150 | /* send list of supported public keys to 'client' */ |
396c147e | 151 | static void |
2e73a022 | 152 | process_request_identities(SocketEntry *e, int version) |
8efc0c15 | 153 | { |
2e73a022 | 154 | Idtab *tab = idtab_lookup(version); |
5260325f | 155 | Buffer msg; |
95f0a918 | 156 | Identity *id; |
5260325f | 157 | |
158 | buffer_init(&msg); | |
2e73a022 | 159 | buffer_put_char(&msg, (version == 1) ? |
160 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
161 | buffer_put_int(&msg, tab->nentries); | |
95f0a918 | 162 | TAILQ_FOREACH(id, &tab->idlist, next) { |
fa08c86b | 163 | if (id->key->type == KEY_RSA1) { |
2e73a022 | 164 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
165 | buffer_put_bignum(&msg, id->key->rsa->e); | |
166 | buffer_put_bignum(&msg, id->key->rsa->n); | |
167 | } else { | |
1e3b8b07 | 168 | u_char *blob; |
169 | u_int blen; | |
fa08c86b | 170 | key_to_blob(id->key, &blob, &blen); |
2e73a022 | 171 | buffer_put_string(&msg, blob, blen); |
172 | xfree(blob); | |
173 | } | |
174 | buffer_put_cstring(&msg, id->comment); | |
5260325f | 175 | } |
176 | buffer_put_int(&e->output, buffer_len(&msg)); | |
177 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
178 | buffer_free(&msg); | |
8efc0c15 | 179 | } |
180 | ||
2e73a022 | 181 | /* ssh1 only */ |
396c147e | 182 | static void |
2e73a022 | 183 | process_authentication_challenge1(SocketEntry *e) |
8efc0c15 | 184 | { |
95f0a918 | 185 | Identity *id; |
186 | Key *key; | |
2e73a022 | 187 | BIGNUM *challenge; |
188 | int i, len; | |
5260325f | 189 | Buffer msg; |
190 | MD5_CTX md; | |
1e3b8b07 | 191 | u_char buf[32], mdbuf[16], session_id[16]; |
192 | u_int response_type; | |
5260325f | 193 | |
194 | buffer_init(&msg); | |
fa08c86b | 195 | key = key_new(KEY_RSA1); |
b775c6f2 | 196 | if ((challenge = BN_new()) == NULL) |
197 | fatal("process_authentication_challenge1: BN_new failed"); | |
5260325f | 198 | |
b9dd5ca1 | 199 | buffer_get_int(&e->request); /* ignored */ |
200 | buffer_get_bignum(&e->request, key->rsa->e); | |
201 | buffer_get_bignum(&e->request, key->rsa->n); | |
202 | buffer_get_bignum(&e->request, challenge); | |
5260325f | 203 | |
2e73a022 | 204 | /* Only protocol 1.1 is supported */ |
b9dd5ca1 | 205 | if (buffer_len(&e->request) == 0) |
2e73a022 | 206 | goto failure; |
b9dd5ca1 | 207 | buffer_get(&e->request, session_id, 16); |
208 | response_type = buffer_get_int(&e->request); | |
2e73a022 | 209 | if (response_type != 1) |
210 | goto failure; | |
211 | ||
95f0a918 | 212 | id = lookup_identity(key, 1); |
213 | if (id != NULL) { | |
214 | Key *private = id->key; | |
2e73a022 | 215 | /* Decrypt the challenge using the private key. */ |
46aa2d1f | 216 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
217 | goto failure; | |
2e73a022 | 218 | |
219 | /* The response is MD5 of decrypted challenge plus session id. */ | |
220 | len = BN_num_bytes(challenge); | |
221 | if (len <= 0 || len > 32) { | |
222 | log("process_authentication_challenge: bad challenge length %d", len); | |
223 | goto failure; | |
5260325f | 224 | } |
2e73a022 | 225 | memset(buf, 0, 32); |
226 | BN_bn2bin(challenge, buf + 32 - len); | |
227 | MD5_Init(&md); | |
228 | MD5_Update(&md, buf, 32); | |
229 | MD5_Update(&md, session_id, 16); | |
230 | MD5_Final(mdbuf, &md); | |
231 | ||
232 | /* Send the response. */ | |
233 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
234 | for (i = 0; i < 16; i++) | |
235 | buffer_put_char(&msg, mdbuf[i]); | |
236 | goto send; | |
237 | } | |
238 | ||
239 | failure: | |
240 | /* Unknown identity or protocol error. Send failure. */ | |
5260325f | 241 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
242 | send: | |
2e73a022 | 243 | buffer_put_int(&e->output, buffer_len(&msg)); |
244 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
245 | key_free(key); | |
246 | BN_clear_free(challenge); | |
247 | buffer_free(&msg); | |
248 | } | |
249 | ||
250 | /* ssh2 only */ | |
396c147e | 251 | static void |
2e73a022 | 252 | process_sign_request2(SocketEntry *e) |
253 | { | |
254 | extern int datafellows; | |
95f0a918 | 255 | Key *key; |
1e3b8b07 | 256 | u_char *blob, *data, *signature = NULL; |
257 | u_int blen, dlen, slen = 0; | |
188adeb2 | 258 | int flags; |
2e73a022 | 259 | Buffer msg; |
260 | int ok = -1; | |
261 | ||
262 | datafellows = 0; | |
227e8e86 | 263 | |
b9dd5ca1 | 264 | blob = buffer_get_string(&e->request, &blen); |
265 | data = buffer_get_string(&e->request, &dlen); | |
188adeb2 | 266 | |
b9dd5ca1 | 267 | flags = buffer_get_int(&e->request); |
188adeb2 | 268 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
269 | datafellows = SSH_BUG_SIGBLOB; | |
2e73a022 | 270 | |
fa08c86b | 271 | key = key_from_blob(blob, blen); |
2e73a022 | 272 | if (key != NULL) { |
95f0a918 | 273 | Identity *id = lookup_identity(key, 2); |
274 | if (id != NULL) | |
275 | ok = key_sign(id->key, &signature, &slen, data, dlen); | |
2e73a022 | 276 | } |
277 | key_free(key); | |
278 | buffer_init(&msg); | |
279 | if (ok == 0) { | |
280 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
281 | buffer_put_string(&msg, signature, slen); | |
282 | } else { | |
283 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
284 | } | |
5260325f | 285 | buffer_put_int(&e->output, buffer_len(&msg)); |
286 | buffer_append(&e->output, buffer_ptr(&msg), | |
2e73a022 | 287 | buffer_len(&msg)); |
5260325f | 288 | buffer_free(&msg); |
2e73a022 | 289 | xfree(data); |
290 | xfree(blob); | |
291 | if (signature != NULL) | |
292 | xfree(signature); | |
8efc0c15 | 293 | } |
294 | ||
2e73a022 | 295 | /* shared */ |
396c147e | 296 | static void |
2e73a022 | 297 | process_remove_identity(SocketEntry *e, int version) |
8efc0c15 | 298 | { |
95f0a918 | 299 | Key *key = NULL; |
1e3b8b07 | 300 | u_char *blob; |
301 | u_int blen; | |
302 | u_int bits; | |
2e73a022 | 303 | int success = 0; |
304 | ||
6aacefa7 | 305 | switch (version) { |
2e73a022 | 306 | case 1: |
fa08c86b | 307 | key = key_new(KEY_RSA1); |
b9dd5ca1 | 308 | bits = buffer_get_int(&e->request); |
309 | buffer_get_bignum(&e->request, key->rsa->e); | |
310 | buffer_get_bignum(&e->request, key->rsa->n); | |
2e73a022 | 311 | |
312 | if (bits != key_size(key)) | |
313 | log("Warning: identity keysize mismatch: actual %d, announced %d", | |
42f11eb2 | 314 | key_size(key), bits); |
2e73a022 | 315 | break; |
316 | case 2: | |
b9dd5ca1 | 317 | blob = buffer_get_string(&e->request, &blen); |
fa08c86b | 318 | key = key_from_blob(blob, blen); |
2e73a022 | 319 | xfree(blob); |
320 | break; | |
321 | } | |
322 | if (key != NULL) { | |
95f0a918 | 323 | Identity *id = lookup_identity(key, version); |
324 | if (id != NULL) { | |
aa3378df | 325 | /* |
326 | * We have this key. Free the old key. Since we | |
327 | * don\'t want to leave empty slots in the middle of | |
d343d900 | 328 | * the array, we actually free the key there and move |
329 | * all the entries between the empty slot and the end | |
330 | * of the array. | |
aa3378df | 331 | */ |
2e73a022 | 332 | Idtab *tab = idtab_lookup(version); |
fa08c86b | 333 | if (tab->nentries < 1) |
334 | fatal("process_remove_identity: " | |
335 | "internal error: tab->nentries %d", | |
336 | tab->nentries); | |
95f0a918 | 337 | TAILQ_REMOVE(&tab->idlist, id, next); |
338 | free_identity(id); | |
2e73a022 | 339 | tab->nentries--; |
340 | success = 1; | |
5260325f | 341 | } |
2e73a022 | 342 | key_free(key); |
343 | } | |
8efc0c15 | 344 | buffer_put_int(&e->output, 1); |
2e73a022 | 345 | buffer_put_char(&e->output, |
346 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 347 | } |
348 | ||
396c147e | 349 | static void |
2e73a022 | 350 | process_remove_all_identities(SocketEntry *e, int version) |
8efc0c15 | 351 | { |
2e73a022 | 352 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 353 | Identity *id; |
8efc0c15 | 354 | |
5260325f | 355 | /* Loop over all identities and clear the keys. */ |
95f0a918 | 356 | for (id = TAILQ_FIRST(&tab->idlist); id; |
357 | id = TAILQ_FIRST(&tab->idlist)) { | |
358 | TAILQ_REMOVE(&tab->idlist, id, next); | |
359 | free_identity(id); | |
5260325f | 360 | } |
8efc0c15 | 361 | |
5260325f | 362 | /* Mark that there are no identities. */ |
2e73a022 | 363 | tab->nentries = 0; |
8efc0c15 | 364 | |
365 | /* Send success. */ | |
366 | buffer_put_int(&e->output, 1); | |
367 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
368 | return; | |
5260325f | 369 | } |
370 | ||
264572cc | 371 | static void |
372 | reaper(void) | |
373 | { | |
374 | Idtab *tab; | |
375 | Identity *id, *nxt; | |
376 | int version; | |
377 | u_int now = time(NULL); | |
378 | ||
379 | for (version = 1; version < 3; version++) { | |
380 | tab = idtab_lookup(version); | |
381 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
382 | nxt = TAILQ_NEXT(id, next); | |
383 | if (id->death != 0 && now >= id->death) { | |
384 | TAILQ_REMOVE(&tab->idlist, id, next); | |
385 | free_identity(id); | |
386 | tab->nentries--; | |
387 | } | |
388 | } | |
389 | } | |
390 | } | |
391 | ||
396c147e | 392 | static void |
fa08c86b | 393 | process_add_identity(SocketEntry *e, int version) |
394 | { | |
395 | Key *k = NULL; | |
396 | char *type_name; | |
2e73a022 | 397 | char *comment; |
fa08c86b | 398 | int type, success = 0; |
2e73a022 | 399 | Idtab *tab = idtab_lookup(version); |
5260325f | 400 | |
2e73a022 | 401 | switch (version) { |
402 | case 1: | |
fa08c86b | 403 | k = key_new_private(KEY_RSA1); |
b9dd5ca1 | 404 | buffer_get_int(&e->request); /* ignored */ |
405 | buffer_get_bignum(&e->request, k->rsa->n); | |
406 | buffer_get_bignum(&e->request, k->rsa->e); | |
407 | buffer_get_bignum(&e->request, k->rsa->d); | |
408 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
2e73a022 | 409 | |
410 | /* SSH and SSL have p and q swapped */ | |
b9dd5ca1 | 411 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
412 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
2e73a022 | 413 | |
414 | /* Generate additional parameters */ | |
2b63e803 | 415 | rsa_generate_additional_parameters(k->rsa); |
2e73a022 | 416 | break; |
417 | case 2: | |
b9dd5ca1 | 418 | type_name = buffer_get_string(&e->request, NULL); |
42f11eb2 | 419 | type = key_type_from_name(type_name); |
fa08c86b | 420 | xfree(type_name); |
6aacefa7 | 421 | switch (type) { |
fa08c86b | 422 | case KEY_DSA: |
423 | k = key_new_private(type); | |
b9dd5ca1 | 424 | buffer_get_bignum2(&e->request, k->dsa->p); |
425 | buffer_get_bignum2(&e->request, k->dsa->q); | |
426 | buffer_get_bignum2(&e->request, k->dsa->g); | |
427 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
428 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
fa08c86b | 429 | break; |
430 | case KEY_RSA: | |
431 | k = key_new_private(type); | |
b9dd5ca1 | 432 | buffer_get_bignum2(&e->request, k->rsa->n); |
433 | buffer_get_bignum2(&e->request, k->rsa->e); | |
434 | buffer_get_bignum2(&e->request, k->rsa->d); | |
435 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
436 | buffer_get_bignum2(&e->request, k->rsa->p); | |
437 | buffer_get_bignum2(&e->request, k->rsa->q); | |
fa08c86b | 438 | |
439 | /* Generate additional parameters */ | |
2b63e803 | 440 | rsa_generate_additional_parameters(k->rsa); |
fa08c86b | 441 | break; |
442 | default: | |
b9dd5ca1 | 443 | buffer_clear(&e->request); |
2e73a022 | 444 | goto send; |
5260325f | 445 | } |
2e73a022 | 446 | break; |
447 | } | |
b9dd5ca1 | 448 | comment = buffer_get_string(&e->request, NULL); |
2e73a022 | 449 | if (k == NULL) { |
450 | xfree(comment); | |
451 | goto send; | |
452 | } | |
453 | success = 1; | |
95f0a918 | 454 | if (lookup_identity(k, version) == NULL) { |
455 | Identity *id = xmalloc(sizeof(Identity)); | |
456 | id->key = k; | |
457 | id->comment = comment; | |
264572cc | 458 | id->death = 0; |
95f0a918 | 459 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
2e73a022 | 460 | /* Increment the number of identities. */ |
461 | tab->nentries++; | |
462 | } else { | |
463 | key_free(k); | |
464 | xfree(comment); | |
465 | } | |
466 | send: | |
5260325f | 467 | buffer_put_int(&e->output, 1); |
2e73a022 | 468 | buffer_put_char(&e->output, |
469 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 470 | } |
471 | ||
264572cc | 472 | static void |
405e0c5e | 473 | process_constrain_identity(SocketEntry *e, int version) |
264572cc | 474 | { |
475 | Key *key = NULL; | |
476 | u_char *blob; | |
37500e74 | 477 | u_int blen, bits, death = 0; |
264572cc | 478 | int success = 0; |
479 | ||
264572cc | 480 | switch (version) { |
481 | case 1: | |
482 | key = key_new(KEY_RSA1); | |
483 | bits = buffer_get_int(&e->request); | |
484 | buffer_get_bignum(&e->request, key->rsa->e); | |
485 | buffer_get_bignum(&e->request, key->rsa->n); | |
486 | ||
487 | break; | |
488 | case 2: | |
489 | blob = buffer_get_string(&e->request, &blen); | |
490 | key = key_from_blob(blob, blen); | |
491 | xfree(blob); | |
492 | break; | |
493 | } | |
37500e74 | 494 | while (buffer_len(&e->request)) { |
495 | switch (buffer_get_char(&e->request)) { | |
405e0c5e | 496 | case SSH_AGENT_CONSTRAIN_LIFETIME: |
37500e74 | 497 | death = time(NULL) + buffer_get_int(&e->request); |
498 | break; | |
499 | default: | |
500 | break; | |
501 | } | |
502 | } | |
264572cc | 503 | if (key != NULL) { |
504 | Identity *id = lookup_identity(key, version); | |
37500e74 | 505 | if (id != NULL && id->death == 0 && death != 0) { |
264572cc | 506 | id->death = death; |
507 | success = 1; | |
508 | } | |
509 | key_free(key); | |
510 | } | |
511 | buffer_put_int(&e->output, 1); | |
512 | buffer_put_char(&e->output, | |
513 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
514 | } | |
515 | ||
3db7f994 | 516 | /* XXX todo: encrypt sensitive data with passphrase */ |
517 | static void | |
518 | process_lock_agent(SocketEntry *e, int lock) | |
519 | { | |
520 | char *passwd; | |
521 | int success = 0; | |
522 | ||
523 | passwd = buffer_get_string(&e->request, NULL); | |
524 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
525 | locked = 0; | |
526 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
527 | xfree(lock_passwd); | |
528 | lock_passwd = NULL; | |
529 | success = 1; | |
530 | } else if (!locked && lock) { | |
531 | locked = 1; | |
532 | lock_passwd = xstrdup(passwd); | |
533 | success = 1; | |
534 | } | |
535 | memset(passwd, 0, strlen(passwd)); | |
536 | xfree(passwd); | |
537 | ||
538 | buffer_put_int(&e->output, 1); | |
539 | buffer_put_char(&e->output, | |
540 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
541 | return; | |
542 | } | |
543 | ||
544 | static void | |
545 | no_identities(SocketEntry *e, u_int type) | |
546 | { | |
547 | Buffer msg; | |
548 | ||
549 | buffer_init(&msg); | |
550 | buffer_put_char(&msg, | |
551 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
552 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
553 | buffer_put_int(&msg, 0); | |
554 | buffer_put_int(&e->output, buffer_len(&msg)); | |
555 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
556 | buffer_free(&msg); | |
557 | } | |
2b5fe3b8 | 558 | |
559 | #ifdef SMARTCARD | |
560 | static void | |
561 | process_add_smartcard_key (SocketEntry *e) | |
562 | { | |
0659cace | 563 | Identity *id; |
2b5fe3b8 | 564 | Idtab *tab; |
0659cace | 565 | Key **keys, *k; |
76139bd8 | 566 | char *sc_reader_id = NULL, *pin; |
0659cace | 567 | int i, version, success = 0; |
184eed6a | 568 | |
b9dd5ca1 | 569 | sc_reader_id = buffer_get_string(&e->request, NULL); |
570 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 571 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 572 | xfree(sc_reader_id); |
76139bd8 | 573 | xfree(pin); |
2b5fe3b8 | 574 | |
0659cace | 575 | if (keys == NULL || keys[0] == NULL) { |
576 | error("sc_get_keys failed"); | |
2b5fe3b8 | 577 | goto send; |
578 | } | |
0659cace | 579 | for (i = 0; keys[i] != NULL; i++) { |
580 | k = keys[i]; | |
581 | version = k->type == KEY_RSA1 ? 1 : 2; | |
582 | tab = idtab_lookup(version); | |
583 | if (lookup_identity(k, version) == NULL) { | |
584 | id = xmalloc(sizeof(Identity)); | |
585 | id->key = k; | |
586 | id->comment = xstrdup("smartcard key"); | |
264572cc | 587 | id->death = 0; |
0659cace | 588 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
589 | tab->nentries++; | |
590 | success = 1; | |
591 | } else { | |
592 | key_free(k); | |
593 | } | |
594 | keys[i] = NULL; | |
2b5fe3b8 | 595 | } |
0659cace | 596 | xfree(keys); |
2b5fe3b8 | 597 | send: |
598 | buffer_put_int(&e->output, 1); | |
599 | buffer_put_char(&e->output, | |
600 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
601 | } | |
602 | ||
603 | static void | |
604 | process_remove_smartcard_key(SocketEntry *e) | |
605 | { | |
0659cace | 606 | Identity *id; |
607 | Idtab *tab; | |
608 | Key **keys, *k = NULL; | |
76139bd8 | 609 | char *sc_reader_id = NULL, *pin; |
0659cace | 610 | int i, version, success = 0; |
2b5fe3b8 | 611 | |
b9dd5ca1 | 612 | sc_reader_id = buffer_get_string(&e->request, NULL); |
613 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 614 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 615 | xfree(sc_reader_id); |
76139bd8 | 616 | xfree(pin); |
2b5fe3b8 | 617 | |
0659cace | 618 | if (keys == NULL || keys[0] == NULL) { |
619 | error("sc_get_keys failed"); | |
620 | goto send; | |
621 | } | |
622 | for (i = 0; keys[i] != NULL; i++) { | |
623 | k = keys[i]; | |
624 | version = k->type == KEY_RSA1 ? 1 : 2; | |
625 | if ((id = lookup_identity(k, version)) != NULL) { | |
626 | tab = idtab_lookup(version); | |
875ec275 | 627 | TAILQ_REMOVE(&tab->idlist, id, next); |
2b5fe3b8 | 628 | tab->nentries--; |
95f0a918 | 629 | free_identity(id); |
2b5fe3b8 | 630 | success = 1; |
631 | } | |
632 | key_free(k); | |
0659cace | 633 | keys[i] = NULL; |
2b5fe3b8 | 634 | } |
0659cace | 635 | xfree(keys); |
636 | send: | |
2b5fe3b8 | 637 | buffer_put_int(&e->output, 1); |
638 | buffer_put_char(&e->output, | |
639 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
640 | } | |
3e984472 | 641 | #endif /* SMARTCARD */ |
2b5fe3b8 | 642 | |
2e73a022 | 643 | /* dispatch incoming messages */ |
644 | ||
396c147e | 645 | static void |
8efc0c15 | 646 | process_message(SocketEntry *e) |
647 | { | |
1e3b8b07 | 648 | u_int msg_len; |
649 | u_int type; | |
650 | u_char *cp; | |
264572cc | 651 | |
652 | /* kill dead keys */ | |
653 | reaper(); | |
654 | ||
5260325f | 655 | if (buffer_len(&e->input) < 5) |
656 | return; /* Incomplete message. */ | |
20905a8e | 657 | cp = buffer_ptr(&e->input); |
5260325f | 658 | msg_len = GET_32BIT(cp); |
659 | if (msg_len > 256 * 1024) { | |
660 | shutdown(e->fd, SHUT_RDWR); | |
661 | close(e->fd); | |
662 | e->type = AUTH_UNUSED; | |
b9dd5ca1 | 663 | buffer_free(&e->input); |
664 | buffer_free(&e->output); | |
665 | buffer_free(&e->request); | |
5260325f | 666 | return; |
667 | } | |
668 | if (buffer_len(&e->input) < msg_len + 4) | |
669 | return; | |
b9dd5ca1 | 670 | |
671 | /* move the current input to e->request */ | |
5260325f | 672 | buffer_consume(&e->input, 4); |
b9dd5ca1 | 673 | buffer_clear(&e->request); |
674 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
675 | buffer_consume(&e->input, msg_len); | |
676 | type = buffer_get_char(&e->request); | |
5260325f | 677 | |
3db7f994 | 678 | /* check wheter agent is locked */ |
679 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
680 | buffer_clear(&e->request); | |
681 | switch (type) { | |
682 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
683 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
684 | /* send empty lists */ | |
685 | no_identities(e, type); | |
686 | break; | |
687 | default: | |
688 | /* send a fail message for all other request types */ | |
689 | buffer_put_int(&e->output, 1); | |
690 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
691 | } | |
692 | return; | |
693 | } | |
694 | ||
2b5fe3b8 | 695 | debug("type %d", type); |
5260325f | 696 | switch (type) { |
3db7f994 | 697 | case SSH_AGENTC_LOCK: |
698 | case SSH_AGENTC_UNLOCK: | |
699 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
700 | break; | |
2e73a022 | 701 | /* ssh1 */ |
5260325f | 702 | case SSH_AGENTC_RSA_CHALLENGE: |
2e73a022 | 703 | process_authentication_challenge1(e); |
704 | break; | |
705 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
706 | process_request_identities(e, 1); | |
5260325f | 707 | break; |
708 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
2e73a022 | 709 | process_add_identity(e, 1); |
5260325f | 710 | break; |
711 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
2e73a022 | 712 | process_remove_identity(e, 1); |
5260325f | 713 | break; |
714 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
2e73a022 | 715 | process_remove_all_identities(e, 1); |
716 | break; | |
405e0c5e | 717 | case SSH_AGENTC_CONSTRAIN_IDENTITY1: |
718 | process_constrain_identity(e, 1); | |
264572cc | 719 | break; |
2e73a022 | 720 | /* ssh2 */ |
721 | case SSH2_AGENTC_SIGN_REQUEST: | |
722 | process_sign_request2(e); | |
723 | break; | |
724 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
725 | process_request_identities(e, 2); | |
726 | break; | |
727 | case SSH2_AGENTC_ADD_IDENTITY: | |
728 | process_add_identity(e, 2); | |
729 | break; | |
730 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
731 | process_remove_identity(e, 2); | |
732 | break; | |
733 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
734 | process_remove_all_identities(e, 2); | |
5260325f | 735 | break; |
405e0c5e | 736 | case SSH_AGENTC_CONSTRAIN_IDENTITY: |
737 | process_constrain_identity(e, 2); | |
264572cc | 738 | break; |
2b5fe3b8 | 739 | #ifdef SMARTCARD |
740 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
741 | process_add_smartcard_key(e); | |
184eed6a | 742 | break; |
2b5fe3b8 | 743 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
744 | process_remove_smartcard_key(e); | |
184eed6a | 745 | break; |
3e984472 | 746 | #endif /* SMARTCARD */ |
5260325f | 747 | default: |
748 | /* Unknown message. Respond with failure. */ | |
749 | error("Unknown message %d", type); | |
b9dd5ca1 | 750 | buffer_clear(&e->request); |
5260325f | 751 | buffer_put_int(&e->output, 1); |
752 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
753 | break; | |
754 | } | |
8efc0c15 | 755 | } |
756 | ||
396c147e | 757 | static void |
17a3011c | 758 | new_socket(sock_type type, int fd) |
8efc0c15 | 759 | { |
1e3b8b07 | 760 | u_int i, old_alloc; |
5260325f | 761 | if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
762 | error("fcntl O_NONBLOCK: %s", strerror(errno)); | |
763 | ||
764 | if (fd > max_fd) | |
765 | max_fd = fd; | |
766 | ||
767 | for (i = 0; i < sockets_alloc; i++) | |
768 | if (sockets[i].type == AUTH_UNUSED) { | |
769 | sockets[i].fd = fd; | |
770 | sockets[i].type = type; | |
771 | buffer_init(&sockets[i].input); | |
772 | buffer_init(&sockets[i].output); | |
b9dd5ca1 | 773 | buffer_init(&sockets[i].request); |
5260325f | 774 | return; |
775 | } | |
776 | old_alloc = sockets_alloc; | |
777 | sockets_alloc += 10; | |
778 | if (sockets) | |
779 | sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0])); | |
780 | else | |
781 | sockets = xmalloc(sockets_alloc * sizeof(sockets[0])); | |
782 | for (i = old_alloc; i < sockets_alloc; i++) | |
783 | sockets[i].type = AUTH_UNUSED; | |
784 | sockets[old_alloc].type = type; | |
785 | sockets[old_alloc].fd = fd; | |
786 | buffer_init(&sockets[old_alloc].input); | |
787 | buffer_init(&sockets[old_alloc].output); | |
b9dd5ca1 | 788 | buffer_init(&sockets[old_alloc].request); |
8efc0c15 | 789 | } |
790 | ||
396c147e | 791 | static int |
e364646f | 792 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, int *nallocp) |
8efc0c15 | 793 | { |
42f11eb2 | 794 | u_int i, sz; |
795 | int n = 0; | |
796 | ||
797 | for (i = 0; i < sockets_alloc; i++) { | |
5260325f | 798 | switch (sockets[i].type) { |
799 | case AUTH_SOCKET: | |
800 | case AUTH_CONNECTION: | |
42f11eb2 | 801 | n = MAX(n, sockets[i].fd); |
5260325f | 802 | break; |
803 | case AUTH_UNUSED: | |
804 | break; | |
805 | default: | |
806 | fatal("Unknown socket type %d", sockets[i].type); | |
807 | break; | |
808 | } | |
42f11eb2 | 809 | } |
810 | ||
811 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
e364646f | 812 | if (*fdrp == NULL || sz > *nallocp) { |
42f11eb2 | 813 | if (*fdrp) |
894c5fa6 | 814 | xfree(*fdrp); |
42f11eb2 | 815 | if (*fdwp) |
894c5fa6 | 816 | xfree(*fdwp); |
42f11eb2 | 817 | *fdrp = xmalloc(sz); |
818 | *fdwp = xmalloc(sz); | |
e364646f | 819 | *nallocp = sz; |
42f11eb2 | 820 | } |
e364646f | 821 | if (n < *fdl) |
822 | debug("XXX shrink: %d < %d", n, *fdl); | |
823 | *fdl = n; | |
42f11eb2 | 824 | memset(*fdrp, 0, sz); |
825 | memset(*fdwp, 0, sz); | |
826 | ||
827 | for (i = 0; i < sockets_alloc; i++) { | |
828 | switch (sockets[i].type) { | |
829 | case AUTH_SOCKET: | |
830 | case AUTH_CONNECTION: | |
831 | FD_SET(sockets[i].fd, *fdrp); | |
832 | if (buffer_len(&sockets[i].output) > 0) | |
833 | FD_SET(sockets[i].fd, *fdwp); | |
834 | break; | |
835 | default: | |
836 | break; | |
837 | } | |
838 | } | |
839 | return (1); | |
8efc0c15 | 840 | } |
841 | ||
396c147e | 842 | static void |
5260325f | 843 | after_select(fd_set *readset, fd_set *writeset) |
8efc0c15 | 844 | { |
1e3b8b07 | 845 | u_int i; |
5260325f | 846 | int len, sock; |
610cd5c6 | 847 | socklen_t slen; |
5260325f | 848 | char buf[1024]; |
849 | struct sockaddr_un sunaddr; | |
850 | ||
851 | for (i = 0; i < sockets_alloc; i++) | |
852 | switch (sockets[i].type) { | |
853 | case AUTH_UNUSED: | |
854 | break; | |
855 | case AUTH_SOCKET: | |
856 | if (FD_ISSET(sockets[i].fd, readset)) { | |
610cd5c6 | 857 | slen = sizeof(sunaddr); |
42f11eb2 | 858 | sock = accept(sockets[i].fd, |
859 | (struct sockaddr *) &sunaddr, &slen); | |
5260325f | 860 | if (sock < 0) { |
fccfbe3b | 861 | error("accept from AUTH_SOCKET: %s", |
862 | strerror(errno)); | |
5260325f | 863 | break; |
864 | } | |
865 | new_socket(AUTH_CONNECTION, sock); | |
866 | } | |
867 | break; | |
868 | case AUTH_CONNECTION: | |
869 | if (buffer_len(&sockets[i].output) > 0 && | |
870 | FD_ISSET(sockets[i].fd, writeset)) { | |
bbc62e59 | 871 | do { |
872 | len = write(sockets[i].fd, | |
873 | buffer_ptr(&sockets[i].output), | |
874 | buffer_len(&sockets[i].output)); | |
875 | if (len == -1 && (errno == EAGAIN || | |
876 | errno == EINTR)) | |
877 | continue; | |
878 | break; | |
879 | } while (1); | |
5260325f | 880 | if (len <= 0) { |
881 | shutdown(sockets[i].fd, SHUT_RDWR); | |
882 | close(sockets[i].fd); | |
883 | sockets[i].type = AUTH_UNUSED; | |
0ac7199f | 884 | buffer_free(&sockets[i].input); |
885 | buffer_free(&sockets[i].output); | |
b9dd5ca1 | 886 | buffer_free(&sockets[i].request); |
5260325f | 887 | break; |
888 | } | |
889 | buffer_consume(&sockets[i].output, len); | |
890 | } | |
891 | if (FD_ISSET(sockets[i].fd, readset)) { | |
bbc62e59 | 892 | do { |
893 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
894 | if (len == -1 && (errno == EAGAIN || | |
895 | errno == EINTR)) | |
896 | continue; | |
897 | break; | |
898 | } while (1); | |
5260325f | 899 | if (len <= 0) { |
900 | shutdown(sockets[i].fd, SHUT_RDWR); | |
901 | close(sockets[i].fd); | |
902 | sockets[i].type = AUTH_UNUSED; | |
0ac7199f | 903 | buffer_free(&sockets[i].input); |
904 | buffer_free(&sockets[i].output); | |
b9dd5ca1 | 905 | buffer_free(&sockets[i].request); |
5260325f | 906 | break; |
907 | } | |
908 | buffer_append(&sockets[i].input, buf, len); | |
909 | process_message(&sockets[i]); | |
910 | } | |
911 | break; | |
912 | default: | |
913 | fatal("Unknown type %d", sockets[i].type); | |
914 | } | |
8efc0c15 | 915 | } |
916 | ||
396c147e | 917 | static void |
fccfbe3b | 918 | cleanup_socket(void *p) |
dae3fa13 | 919 | { |
2f4b2e38 | 920 | if (socket_name[0]) |
921 | unlink(socket_name); | |
922 | if (socket_dir[0]) | |
923 | rmdir(socket_dir); | |
8efc0c15 | 924 | } |
925 | ||
396c147e | 926 | static void |
dae3fa13 | 927 | cleanup_exit(int i) |
928 | { | |
fccfbe3b | 929 | cleanup_socket(NULL); |
5260325f | 930 | exit(i); |
dae3fa13 | 931 | } |
932 | ||
396c147e | 933 | static void |
2f4b2e38 | 934 | cleanup_handler(int sig) |
935 | { | |
fccfbe3b | 936 | cleanup_socket(NULL); |
2f4b2e38 | 937 | _exit(2); |
938 | } | |
939 | ||
7efa8482 | 940 | static void |
941 | check_parent_exists(int sig) | |
942 | { | |
943 | int save_errno = errno; | |
944 | ||
945 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
946 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
947 | cleanup_handler(sig); /* safe */ | |
948 | } | |
949 | signal(SIGALRM, check_parent_exists); | |
950 | alarm(10); | |
951 | errno = save_errno; | |
952 | } | |
953 | ||
396c147e | 954 | static void |
cc8aca8a | 955 | usage(void) |
dae3fa13 | 956 | { |
33e766d2 | 957 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", |
0e3c1f95 | 958 | __progname); |
33e766d2 | 959 | fprintf(stderr, "Options:\n"); |
960 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
961 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
962 | fprintf(stderr, " -k Kill the current agent.\n"); | |
963 | fprintf(stderr, " -d Debug mode.\n"); | |
3e7efb37 | 964 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
5260325f | 965 | exit(1); |
dae3fa13 | 966 | } |
967 | ||
8efc0c15 | 968 | int |
969 | main(int ac, char **av) | |
970 | { | |
e364646f | 971 | int sock, c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0, ch, nalloc; |
5260325f | 972 | struct sockaddr_un sunaddr; |
b03bd394 | 973 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 974 | struct rlimit rlim; |
c7ccfd39 | 975 | #endif |
976 | #ifdef HAVE_CYGWIN | |
977 | int prev_mask; | |
b03bd394 | 978 | #endif |
5260325f | 979 | pid_t pid; |
980 | char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid]; | |
3e7efb37 | 981 | char *agentsocket = NULL; |
c04f75f1 | 982 | extern int optind; |
42f11eb2 | 983 | fd_set *readsetp = NULL, *writesetp = NULL; |
fcb975eb | 984 | |
457fc0c6 | 985 | SSLeay_add_all_algorithms(); |
986 | ||
260d427b | 987 | __progname = get_progname(av[0]); |
264dce47 | 988 | init_rng(); |
e339aa53 | 989 | seed_rng(); |
2b87da3b | 990 | |
4e577b89 | 991 | #ifdef __GNU_LIBRARY__ |
3e7efb37 | 992 | while ((ch = getopt(ac, av, "+cdksa:")) != -1) { |
4e577b89 | 993 | #else /* __GNU_LIBRARY__ */ |
3e7efb37 | 994 | while ((ch = getopt(ac, av, "cdksa:")) != -1) { |
4e577b89 | 995 | #endif /* __GNU_LIBRARY__ */ |
5260325f | 996 | switch (ch) { |
997 | case 'c': | |
998 | if (s_flag) | |
999 | usage(); | |
1000 | c_flag++; | |
1001 | break; | |
1002 | case 'k': | |
1003 | k_flag++; | |
1004 | break; | |
1005 | case 's': | |
1006 | if (c_flag) | |
1007 | usage(); | |
1008 | s_flag++; | |
1009 | break; | |
ffdb5d70 | 1010 | case 'd': |
1011 | if (d_flag) | |
1012 | usage(); | |
1013 | d_flag++; | |
1014 | break; | |
3e7efb37 | 1015 | case 'a': |
1016 | agentsocket = optarg; | |
1017 | break; | |
5260325f | 1018 | default: |
1019 | usage(); | |
1020 | } | |
dae3fa13 | 1021 | } |
5260325f | 1022 | ac -= optind; |
1023 | av += optind; | |
1024 | ||
ffdb5d70 | 1025 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
5260325f | 1026 | usage(); |
1027 | ||
b745a2f2 | 1028 | if (ac == 0 && !c_flag && !s_flag) { |
5260325f | 1029 | shell = getenv("SHELL"); |
1030 | if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
1031 | c_flag = 1; | |
dae3fa13 | 1032 | } |
5260325f | 1033 | if (k_flag) { |
1034 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); | |
1035 | if (pidstr == NULL) { | |
1036 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
42f11eb2 | 1037 | SSH_AGENTPID_ENV_NAME); |
5260325f | 1038 | exit(1); |
1039 | } | |
1040 | pid = atoi(pidstr); | |
42f11eb2 | 1041 | if (pid < 1) { |
5260325f | 1042 | fprintf(stderr, "%s=\"%s\", which is not a good PID\n", |
42f11eb2 | 1043 | SSH_AGENTPID_ENV_NAME, pidstr); |
5260325f | 1044 | exit(1); |
1045 | } | |
1046 | if (kill(pid, SIGTERM) == -1) { | |
1047 | perror("kill"); | |
1048 | exit(1); | |
1049 | } | |
1050 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1051 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1052 | printf(format, SSH_AGENTPID_ENV_NAME); | |
c457707e | 1053 | printf("echo Agent pid %ld killed;\n", (long)pid); |
5260325f | 1054 | exit(0); |
dae3fa13 | 1055 | } |
5260325f | 1056 | parent_pid = getpid(); |
1057 | ||
3e7efb37 | 1058 | if (agentsocket == NULL) { |
1059 | /* Create private directory for agent socket */ | |
1060 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir); | |
1061 | if (mkdtemp(socket_dir) == NULL) { | |
1062 | perror("mkdtemp: private socket dir"); | |
1063 | exit(1); | |
1064 | } | |
c457707e | 1065 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
1066 | (long)parent_pid); | |
3e7efb37 | 1067 | } else { |
1068 | /* Try to use specified agent socket */ | |
1069 | socket_dir[0] = '\0'; | |
1070 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
5260325f | 1071 | } |
5260325f | 1072 | |
aa3378df | 1073 | /* |
1074 | * Create socket early so it will exist before command gets run from | |
1075 | * the parent. | |
1076 | */ | |
5260325f | 1077 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
1078 | if (sock < 0) { | |
1079 | perror("socket"); | |
1080 | cleanup_exit(1); | |
1081 | } | |
1082 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1083 | sunaddr.sun_family = AF_UNIX; | |
1084 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
c7ccfd39 | 1085 | #ifdef HAVE_CYGWIN |
1086 | prev_mask = umask(0177); | |
1087 | #endif | |
5260325f | 1088 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { |
1089 | perror("bind"); | |
c7ccfd39 | 1090 | #ifdef HAVE_CYGWIN |
1091 | umask(prev_mask); | |
1092 | #endif | |
5260325f | 1093 | cleanup_exit(1); |
1094 | } | |
c7ccfd39 | 1095 | #ifdef HAVE_CYGWIN |
1096 | umask(prev_mask); | |
1097 | #endif | |
5260325f | 1098 | if (listen(sock, 5) < 0) { |
1099 | perror("listen"); | |
1100 | cleanup_exit(1); | |
dae3fa13 | 1101 | } |
42f11eb2 | 1102 | |
aa3378df | 1103 | /* |
1104 | * Fork, and have the parent execute the command, if any, or present | |
1105 | * the socket data. The child continues as the authentication agent. | |
1106 | */ | |
ffdb5d70 | 1107 | if (d_flag) { |
1108 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1109 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1110 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1111 | SSH_AUTHSOCKET_ENV_NAME); | |
c457707e | 1112 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
ffdb5d70 | 1113 | goto skip; |
1114 | } | |
5260325f | 1115 | pid = fork(); |
1116 | if (pid == -1) { | |
1117 | perror("fork"); | |
fccfbe3b | 1118 | cleanup_exit(1); |
dae3fa13 | 1119 | } |
5260325f | 1120 | if (pid != 0) { /* Parent - execute the given command. */ |
1121 | close(sock); | |
c457707e | 1122 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
5260325f | 1123 | if (ac == 0) { |
1124 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1125 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
42f11eb2 | 1126 | SSH_AUTHSOCKET_ENV_NAME); |
5260325f | 1127 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
42f11eb2 | 1128 | SSH_AGENTPID_ENV_NAME); |
c457707e | 1129 | printf("echo Agent pid %ld;\n", (long)pid); |
5260325f | 1130 | exit(0); |
1131 | } | |
bcbf86ec | 1132 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
1133 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1134 | perror("setenv"); | |
1135 | exit(1); | |
1136 | } | |
5260325f | 1137 | execvp(av[0], av); |
1138 | perror(av[0]); | |
1139 | exit(1); | |
1140 | } | |
fccfbe3b | 1141 | /* child */ |
1142 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
ec9f3450 | 1143 | |
1144 | if (setsid() == -1) { | |
fccfbe3b | 1145 | error("setsid: %s", strerror(errno)); |
ec9f3450 | 1146 | cleanup_exit(1); |
1147 | } | |
1148 | ||
1149 | (void)chdir("/"); | |
5260325f | 1150 | close(0); |
1151 | close(1); | |
1152 | close(2); | |
dae3fa13 | 1153 | |
b03bd394 | 1154 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1155 | /* deny core dumps, since memory contains unencrypted private keys */ |
1156 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1157 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
fccfbe3b | 1158 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
0b6fbf03 | 1159 | cleanup_exit(1); |
1160 | } | |
b03bd394 | 1161 | #endif |
ffdb5d70 | 1162 | |
1163 | skip: | |
fccfbe3b | 1164 | fatal_add_cleanup(cleanup_socket, NULL); |
5260325f | 1165 | new_socket(AUTH_SOCKET, sock); |
1166 | if (ac > 0) { | |
1167 | signal(SIGALRM, check_parent_exists); | |
1168 | alarm(10); | |
1169 | } | |
2e73a022 | 1170 | idtab_init(); |
1ee482c5 | 1171 | if (!d_flag) |
ffdb5d70 | 1172 | signal(SIGINT, SIG_IGN); |
1ee482c5 | 1173 | signal(SIGPIPE, SIG_IGN); |
2f4b2e38 | 1174 | signal(SIGHUP, cleanup_handler); |
1175 | signal(SIGTERM, cleanup_handler); | |
e364646f | 1176 | nalloc = 0; |
1177 | ||
5260325f | 1178 | while (1) { |
e364646f | 1179 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); |
42f11eb2 | 1180 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { |
5260325f | 1181 | if (errno == EINTR) |
1182 | continue; | |
fccfbe3b | 1183 | fatal("select: %s", strerror(errno)); |
5260325f | 1184 | } |
42f11eb2 | 1185 | after_select(readsetp, writesetp); |
8efc0c15 | 1186 | } |
5260325f | 1187 | /* NOTREACHED */ |
8efc0c15 | 1188 | } |