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240debe0 | 1 | /* $OpenBSD: ssh-agent.c,v 1.153 2006/10/06 02:29:19 djm Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * The authentication agent program. | |
7 | * | |
8 | * As far as I am concerned, the code I have written for this software | |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
13 | * | |
14 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
15 | * | |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #include "includes.h" | |
30460aeb | 38 | |
39 | #include <sys/types.h> | |
40 | #include <sys/param.h> | |
41 | #include <sys/resource.h> | |
42 | #include <sys/stat.h> | |
43 | #include <sys/socket.h> | |
44 | #ifdef HAVE_SYS_TIME_H | |
45 | # include <sys/time.h> | |
46 | #endif | |
47 | #ifdef HAVE_SYS_UN_H | |
48 | # include <sys/un.h> | |
49 | #endif | |
d03f4262 | 50 | #include "openbsd-compat/sys-queue.h" |
3c0ef626 | 51 | |
52 | #include <openssl/evp.h> | |
53 | #include <openssl/md5.h> | |
54 | ||
30460aeb | 55 | #include <errno.h> |
56 | #include <fcntl.h> | |
57 | #ifdef HAVE_PATHS_H | |
58 | # include <paths.h> | |
59 | #endif | |
60 | #include <signal.h> | |
61 | #include <stdarg.h> | |
62 | #include <stdio.h> | |
63 | #include <stdlib.h> | |
64 | #include <time.h> | |
65 | #include <string.h> | |
66 | #include <unistd.h> | |
67 | ||
68 | #include "xmalloc.h" | |
3c0ef626 | 69 | #include "ssh.h" |
70 | #include "rsa.h" | |
71 | #include "buffer.h" | |
3c0ef626 | 72 | #include "key.h" |
73 | #include "authfd.h" | |
3c0ef626 | 74 | #include "compat.h" |
75 | #include "log.h" | |
bfe49944 | 76 | #include "misc.h" |
3c0ef626 | 77 | |
78 | #ifdef SMARTCARD | |
3c0ef626 | 79 | #include "scard.h" |
80 | #endif | |
81 | ||
12a403af | 82 | #if defined(HAVE_SYS_PRCTL_H) |
83 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ | |
84 | #endif | |
85 | ||
df84fde0 | 86 | typedef enum { |
87 | AUTH_UNUSED, | |
88 | AUTH_SOCKET, | |
89 | AUTH_CONNECTION | |
90 | } sock_type; | |
91 | ||
3c0ef626 | 92 | typedef struct { |
93 | int fd; | |
df84fde0 | 94 | sock_type type; |
3c0ef626 | 95 | Buffer input; |
96 | Buffer output; | |
df84fde0 | 97 | Buffer request; |
3c0ef626 | 98 | } SocketEntry; |
99 | ||
100 | u_int sockets_alloc = 0; | |
101 | SocketEntry *sockets = NULL; | |
102 | ||
df84fde0 | 103 | typedef struct identity { |
104 | TAILQ_ENTRY(identity) next; | |
3c0ef626 | 105 | Key *key; |
106 | char *comment; | |
df84fde0 | 107 | u_int death; |
bfe49944 | 108 | u_int confirm; |
3c0ef626 | 109 | } Identity; |
110 | ||
111 | typedef struct { | |
112 | int nentries; | |
df84fde0 | 113 | TAILQ_HEAD(idqueue, identity) idlist; |
3c0ef626 | 114 | } Idtab; |
115 | ||
116 | /* private key table, one per protocol version */ | |
117 | Idtab idtable[3]; | |
118 | ||
119 | int max_fd = 0; | |
120 | ||
121 | /* pid of shell == parent of agent */ | |
122 | pid_t parent_pid = -1; | |
123 | ||
124 | /* pathname and directory for AUTH_SOCKET */ | |
30460aeb | 125 | char socket_name[MAXPATHLEN]; |
126 | char socket_dir[MAXPATHLEN]; | |
3c0ef626 | 127 | |
df84fde0 | 128 | /* locking */ |
129 | int locked = 0; | |
130 | char *lock_passwd = NULL; | |
131 | ||
3c0ef626 | 132 | extern char *__progname; |
3c0ef626 | 133 | |
bfe49944 | 134 | /* Default lifetime (0 == forever) */ |
135 | static int lifetime = 0; | |
136 | ||
d03f4262 | 137 | static void |
138 | close_socket(SocketEntry *e) | |
139 | { | |
140 | close(e->fd); | |
141 | e->fd = -1; | |
142 | e->type = AUTH_UNUSED; | |
143 | buffer_free(&e->input); | |
144 | buffer_free(&e->output); | |
145 | buffer_free(&e->request); | |
146 | } | |
147 | ||
3c0ef626 | 148 | static void |
149 | idtab_init(void) | |
150 | { | |
151 | int i; | |
276b07a3 | 152 | |
df84fde0 | 153 | for (i = 0; i <=2; i++) { |
154 | TAILQ_INIT(&idtable[i].idlist); | |
3c0ef626 | 155 | idtable[i].nentries = 0; |
156 | } | |
157 | } | |
158 | ||
159 | /* return private key table for requested protocol version */ | |
160 | static Idtab * | |
161 | idtab_lookup(int version) | |
162 | { | |
163 | if (version < 1 || version > 2) | |
164 | fatal("internal error, bad protocol version %d", version); | |
165 | return &idtable[version]; | |
166 | } | |
167 | ||
df84fde0 | 168 | static void |
169 | free_identity(Identity *id) | |
170 | { | |
171 | key_free(id->key); | |
172 | xfree(id->comment); | |
173 | xfree(id); | |
174 | } | |
175 | ||
3c0ef626 | 176 | /* return matching private key for given public key */ |
df84fde0 | 177 | static Identity * |
178 | lookup_identity(Key *key, int version) | |
3c0ef626 | 179 | { |
df84fde0 | 180 | Identity *id; |
181 | ||
3c0ef626 | 182 | Idtab *tab = idtab_lookup(version); |
df84fde0 | 183 | TAILQ_FOREACH(id, &tab->idlist, next) { |
184 | if (key_equal(key, id->key)) | |
185 | return (id); | |
3c0ef626 | 186 | } |
df84fde0 | 187 | return (NULL); |
3c0ef626 | 188 | } |
189 | ||
bfe49944 | 190 | /* Check confirmation of keysign request */ |
191 | static int | |
192 | confirm_key(Identity *id) | |
193 | { | |
dfddba3d | 194 | char *p; |
bfe49944 | 195 | int ret = -1; |
196 | ||
197 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
dfddba3d | 198 | if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", |
199 | id->comment, p)) | |
200 | ret = 0; | |
bfe49944 | 201 | xfree(p); |
dfddba3d | 202 | |
bfe49944 | 203 | return (ret); |
204 | } | |
205 | ||
3c0ef626 | 206 | /* send list of supported public keys to 'client' */ |
207 | static void | |
208 | process_request_identities(SocketEntry *e, int version) | |
209 | { | |
210 | Idtab *tab = idtab_lookup(version); | |
df84fde0 | 211 | Identity *id; |
276b07a3 | 212 | Buffer msg; |
3c0ef626 | 213 | |
214 | buffer_init(&msg); | |
215 | buffer_put_char(&msg, (version == 1) ? | |
216 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
217 | buffer_put_int(&msg, tab->nentries); | |
df84fde0 | 218 | TAILQ_FOREACH(id, &tab->idlist, next) { |
3c0ef626 | 219 | if (id->key->type == KEY_RSA1) { |
220 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); | |
221 | buffer_put_bignum(&msg, id->key->rsa->e); | |
222 | buffer_put_bignum(&msg, id->key->rsa->n); | |
223 | } else { | |
224 | u_char *blob; | |
225 | u_int blen; | |
226 | key_to_blob(id->key, &blob, &blen); | |
227 | buffer_put_string(&msg, blob, blen); | |
228 | xfree(blob); | |
229 | } | |
230 | buffer_put_cstring(&msg, id->comment); | |
231 | } | |
232 | buffer_put_int(&e->output, buffer_len(&msg)); | |
233 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
234 | buffer_free(&msg); | |
235 | } | |
236 | ||
237 | /* ssh1 only */ | |
238 | static void | |
239 | process_authentication_challenge1(SocketEntry *e) | |
240 | { | |
276b07a3 | 241 | u_char buf[32], mdbuf[16], session_id[16]; |
242 | u_int response_type; | |
3c0ef626 | 243 | BIGNUM *challenge; |
276b07a3 | 244 | Identity *id; |
3c0ef626 | 245 | int i, len; |
246 | Buffer msg; | |
247 | MD5_CTX md; | |
276b07a3 | 248 | Key *key; |
3c0ef626 | 249 | |
250 | buffer_init(&msg); | |
251 | key = key_new(KEY_RSA1); | |
df84fde0 | 252 | if ((challenge = BN_new()) == NULL) |
253 | fatal("process_authentication_challenge1: BN_new failed"); | |
3c0ef626 | 254 | |
276b07a3 | 255 | (void) buffer_get_int(&e->request); /* ignored */ |
df84fde0 | 256 | buffer_get_bignum(&e->request, key->rsa->e); |
257 | buffer_get_bignum(&e->request, key->rsa->n); | |
258 | buffer_get_bignum(&e->request, challenge); | |
3c0ef626 | 259 | |
260 | /* Only protocol 1.1 is supported */ | |
df84fde0 | 261 | if (buffer_len(&e->request) == 0) |
3c0ef626 | 262 | goto failure; |
df84fde0 | 263 | buffer_get(&e->request, session_id, 16); |
264 | response_type = buffer_get_int(&e->request); | |
3c0ef626 | 265 | if (response_type != 1) |
266 | goto failure; | |
267 | ||
df84fde0 | 268 | id = lookup_identity(key, 1); |
bfe49944 | 269 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { |
df84fde0 | 270 | Key *private = id->key; |
3c0ef626 | 271 | /* Decrypt the challenge using the private key. */ |
272 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) | |
273 | goto failure; | |
274 | ||
275 | /* The response is MD5 of decrypted challenge plus session id. */ | |
276 | len = BN_num_bytes(challenge); | |
277 | if (len <= 0 || len > 32) { | |
7cac2b65 | 278 | logit("process_authentication_challenge: bad challenge length %d", len); |
3c0ef626 | 279 | goto failure; |
280 | } | |
281 | memset(buf, 0, 32); | |
282 | BN_bn2bin(challenge, buf + 32 - len); | |
283 | MD5_Init(&md); | |
284 | MD5_Update(&md, buf, 32); | |
285 | MD5_Update(&md, session_id, 16); | |
286 | MD5_Final(mdbuf, &md); | |
287 | ||
288 | /* Send the response. */ | |
289 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
290 | for (i = 0; i < 16; i++) | |
291 | buffer_put_char(&msg, mdbuf[i]); | |
292 | goto send; | |
293 | } | |
294 | ||
295 | failure: | |
296 | /* Unknown identity or protocol error. Send failure. */ | |
297 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
298 | send: | |
299 | buffer_put_int(&e->output, buffer_len(&msg)); | |
300 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
301 | key_free(key); | |
302 | BN_clear_free(challenge); | |
303 | buffer_free(&msg); | |
304 | } | |
305 | ||
306 | /* ssh2 only */ | |
307 | static void | |
308 | process_sign_request2(SocketEntry *e) | |
309 | { | |
3c0ef626 | 310 | u_char *blob, *data, *signature = NULL; |
311 | u_int blen, dlen, slen = 0; | |
276b07a3 | 312 | extern int datafellows; |
313 | int ok = -1, flags; | |
3c0ef626 | 314 | Buffer msg; |
276b07a3 | 315 | Key *key; |
3c0ef626 | 316 | |
317 | datafellows = 0; | |
318 | ||
df84fde0 | 319 | blob = buffer_get_string(&e->request, &blen); |
320 | data = buffer_get_string(&e->request, &dlen); | |
3c0ef626 | 321 | |
df84fde0 | 322 | flags = buffer_get_int(&e->request); |
3c0ef626 | 323 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
324 | datafellows = SSH_BUG_SIGBLOB; | |
325 | ||
326 | key = key_from_blob(blob, blen); | |
327 | if (key != NULL) { | |
df84fde0 | 328 | Identity *id = lookup_identity(key, 2); |
bfe49944 | 329 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) |
df84fde0 | 330 | ok = key_sign(id->key, &signature, &slen, data, dlen); |
30460aeb | 331 | key_free(key); |
3c0ef626 | 332 | } |
3c0ef626 | 333 | buffer_init(&msg); |
334 | if (ok == 0) { | |
335 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
336 | buffer_put_string(&msg, signature, slen); | |
337 | } else { | |
338 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
339 | } | |
340 | buffer_put_int(&e->output, buffer_len(&msg)); | |
341 | buffer_append(&e->output, buffer_ptr(&msg), | |
342 | buffer_len(&msg)); | |
343 | buffer_free(&msg); | |
344 | xfree(data); | |
345 | xfree(blob); | |
346 | if (signature != NULL) | |
347 | xfree(signature); | |
348 | } | |
349 | ||
350 | /* shared */ | |
351 | static void | |
352 | process_remove_identity(SocketEntry *e, int version) | |
353 | { | |
276b07a3 | 354 | u_int blen, bits; |
355 | int success = 0; | |
df84fde0 | 356 | Key *key = NULL; |
3c0ef626 | 357 | u_char *blob; |
3c0ef626 | 358 | |
df84fde0 | 359 | switch (version) { |
3c0ef626 | 360 | case 1: |
361 | key = key_new(KEY_RSA1); | |
df84fde0 | 362 | bits = buffer_get_int(&e->request); |
363 | buffer_get_bignum(&e->request, key->rsa->e); | |
364 | buffer_get_bignum(&e->request, key->rsa->n); | |
3c0ef626 | 365 | |
366 | if (bits != key_size(key)) | |
7cac2b65 | 367 | logit("Warning: identity keysize mismatch: actual %u, announced %u", |
3c0ef626 | 368 | key_size(key), bits); |
369 | break; | |
370 | case 2: | |
df84fde0 | 371 | blob = buffer_get_string(&e->request, &blen); |
3c0ef626 | 372 | key = key_from_blob(blob, blen); |
373 | xfree(blob); | |
374 | break; | |
375 | } | |
376 | if (key != NULL) { | |
df84fde0 | 377 | Identity *id = lookup_identity(key, version); |
378 | if (id != NULL) { | |
3c0ef626 | 379 | /* |
380 | * We have this key. Free the old key. Since we | |
08822d99 | 381 | * don't want to leave empty slots in the middle of |
3c0ef626 | 382 | * the array, we actually free the key there and move |
383 | * all the entries between the empty slot and the end | |
384 | * of the array. | |
385 | */ | |
386 | Idtab *tab = idtab_lookup(version); | |
3c0ef626 | 387 | if (tab->nentries < 1) |
388 | fatal("process_remove_identity: " | |
389 | "internal error: tab->nentries %d", | |
390 | tab->nentries); | |
df84fde0 | 391 | TAILQ_REMOVE(&tab->idlist, id, next); |
392 | free_identity(id); | |
3c0ef626 | 393 | tab->nentries--; |
394 | success = 1; | |
395 | } | |
396 | key_free(key); | |
397 | } | |
398 | buffer_put_int(&e->output, 1); | |
399 | buffer_put_char(&e->output, | |
400 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
401 | } | |
402 | ||
403 | static void | |
404 | process_remove_all_identities(SocketEntry *e, int version) | |
405 | { | |
3c0ef626 | 406 | Idtab *tab = idtab_lookup(version); |
df84fde0 | 407 | Identity *id; |
3c0ef626 | 408 | |
409 | /* Loop over all identities and clear the keys. */ | |
df84fde0 | 410 | for (id = TAILQ_FIRST(&tab->idlist); id; |
411 | id = TAILQ_FIRST(&tab->idlist)) { | |
412 | TAILQ_REMOVE(&tab->idlist, id, next); | |
413 | free_identity(id); | |
3c0ef626 | 414 | } |
415 | ||
416 | /* Mark that there are no identities. */ | |
417 | tab->nentries = 0; | |
418 | ||
419 | /* Send success. */ | |
420 | buffer_put_int(&e->output, 1); | |
421 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
df84fde0 | 422 | } |
423 | ||
424 | static void | |
425 | reaper(void) | |
426 | { | |
276b07a3 | 427 | u_int now = time(NULL); |
df84fde0 | 428 | Identity *id, *nxt; |
429 | int version; | |
276b07a3 | 430 | Idtab *tab; |
df84fde0 | 431 | |
432 | for (version = 1; version < 3; version++) { | |
433 | tab = idtab_lookup(version); | |
434 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
435 | nxt = TAILQ_NEXT(id, next); | |
436 | if (id->death != 0 && now >= id->death) { | |
437 | TAILQ_REMOVE(&tab->idlist, id, next); | |
438 | free_identity(id); | |
439 | tab->nentries--; | |
440 | } | |
441 | } | |
442 | } | |
3c0ef626 | 443 | } |
444 | ||
445 | static void | |
446 | process_add_identity(SocketEntry *e, int version) | |
447 | { | |
3c0ef626 | 448 | Idtab *tab = idtab_lookup(version); |
bfe49944 | 449 | int type, success = 0, death = 0, confirm = 0; |
276b07a3 | 450 | char *type_name, *comment; |
451 | Key *k = NULL; | |
3c0ef626 | 452 | |
453 | switch (version) { | |
454 | case 1: | |
455 | k = key_new_private(KEY_RSA1); | |
276b07a3 | 456 | (void) buffer_get_int(&e->request); /* ignored */ |
df84fde0 | 457 | buffer_get_bignum(&e->request, k->rsa->n); |
458 | buffer_get_bignum(&e->request, k->rsa->e); | |
459 | buffer_get_bignum(&e->request, k->rsa->d); | |
460 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
3c0ef626 | 461 | |
462 | /* SSH and SSL have p and q swapped */ | |
df84fde0 | 463 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
464 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
3c0ef626 | 465 | |
466 | /* Generate additional parameters */ | |
467 | rsa_generate_additional_parameters(k->rsa); | |
468 | break; | |
469 | case 2: | |
df84fde0 | 470 | type_name = buffer_get_string(&e->request, NULL); |
3c0ef626 | 471 | type = key_type_from_name(type_name); |
472 | xfree(type_name); | |
df84fde0 | 473 | switch (type) { |
3c0ef626 | 474 | case KEY_DSA: |
475 | k = key_new_private(type); | |
df84fde0 | 476 | buffer_get_bignum2(&e->request, k->dsa->p); |
477 | buffer_get_bignum2(&e->request, k->dsa->q); | |
478 | buffer_get_bignum2(&e->request, k->dsa->g); | |
479 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
480 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
3c0ef626 | 481 | break; |
482 | case KEY_RSA: | |
483 | k = key_new_private(type); | |
df84fde0 | 484 | buffer_get_bignum2(&e->request, k->rsa->n); |
485 | buffer_get_bignum2(&e->request, k->rsa->e); | |
486 | buffer_get_bignum2(&e->request, k->rsa->d); | |
487 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
488 | buffer_get_bignum2(&e->request, k->rsa->p); | |
489 | buffer_get_bignum2(&e->request, k->rsa->q); | |
3c0ef626 | 490 | |
491 | /* Generate additional parameters */ | |
492 | rsa_generate_additional_parameters(k->rsa); | |
493 | break; | |
494 | default: | |
df84fde0 | 495 | buffer_clear(&e->request); |
3c0ef626 | 496 | goto send; |
497 | } | |
498 | break; | |
499 | } | |
bfe49944 | 500 | /* enable blinding */ |
501 | switch (k->type) { | |
502 | case KEY_RSA: | |
503 | case KEY_RSA1: | |
504 | if (RSA_blinding_on(k->rsa, NULL) != 1) { | |
505 | error("process_add_identity: RSA_blinding_on failed"); | |
506 | key_free(k); | |
507 | goto send; | |
508 | } | |
509 | break; | |
510 | } | |
df84fde0 | 511 | comment = buffer_get_string(&e->request, NULL); |
3c0ef626 | 512 | if (k == NULL) { |
513 | xfree(comment); | |
514 | goto send; | |
515 | } | |
516 | success = 1; | |
df84fde0 | 517 | while (buffer_len(&e->request)) { |
518 | switch (buffer_get_char(&e->request)) { | |
519 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
520 | death = time(NULL) + buffer_get_int(&e->request); | |
521 | break; | |
bfe49944 | 522 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
523 | confirm = 1; | |
524 | break; | |
df84fde0 | 525 | default: |
526 | break; | |
527 | } | |
528 | } | |
bfe49944 | 529 | if (lifetime && !death) |
530 | death = time(NULL) + lifetime; | |
df84fde0 | 531 | if (lookup_identity(k, version) == NULL) { |
532 | Identity *id = xmalloc(sizeof(Identity)); | |
533 | id->key = k; | |
534 | id->comment = comment; | |
535 | id->death = death; | |
bfe49944 | 536 | id->confirm = confirm; |
df84fde0 | 537 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
3c0ef626 | 538 | /* Increment the number of identities. */ |
539 | tab->nentries++; | |
540 | } else { | |
541 | key_free(k); | |
542 | xfree(comment); | |
543 | } | |
544 | send: | |
545 | buffer_put_int(&e->output, 1); | |
546 | buffer_put_char(&e->output, | |
547 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
548 | } | |
549 | ||
df84fde0 | 550 | /* XXX todo: encrypt sensitive data with passphrase */ |
551 | static void | |
552 | process_lock_agent(SocketEntry *e, int lock) | |
553 | { | |
df84fde0 | 554 | int success = 0; |
276b07a3 | 555 | char *passwd; |
df84fde0 | 556 | |
557 | passwd = buffer_get_string(&e->request, NULL); | |
558 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
559 | locked = 0; | |
560 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
561 | xfree(lock_passwd); | |
562 | lock_passwd = NULL; | |
563 | success = 1; | |
564 | } else if (!locked && lock) { | |
565 | locked = 1; | |
566 | lock_passwd = xstrdup(passwd); | |
567 | success = 1; | |
568 | } | |
569 | memset(passwd, 0, strlen(passwd)); | |
570 | xfree(passwd); | |
571 | ||
572 | buffer_put_int(&e->output, 1); | |
573 | buffer_put_char(&e->output, | |
574 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
575 | } | |
576 | ||
577 | static void | |
578 | no_identities(SocketEntry *e, u_int type) | |
579 | { | |
580 | Buffer msg; | |
581 | ||
582 | buffer_init(&msg); | |
583 | buffer_put_char(&msg, | |
584 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
585 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
586 | buffer_put_int(&msg, 0); | |
587 | buffer_put_int(&e->output, buffer_len(&msg)); | |
588 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
589 | buffer_free(&msg); | |
590 | } | |
3c0ef626 | 591 | |
592 | #ifdef SMARTCARD | |
593 | static void | |
594 | process_add_smartcard_key (SocketEntry *e) | |
595 | { | |
df84fde0 | 596 | char *sc_reader_id = NULL, *pin; |
7cac2b65 | 597 | int i, version, success = 0, death = 0, confirm = 0; |
276b07a3 | 598 | Key **keys, *k; |
599 | Identity *id; | |
600 | Idtab *tab; | |
df84fde0 | 601 | |
602 | sc_reader_id = buffer_get_string(&e->request, NULL); | |
603 | pin = buffer_get_string(&e->request, NULL); | |
7cac2b65 | 604 | |
605 | while (buffer_len(&e->request)) { | |
606 | switch (buffer_get_char(&e->request)) { | |
607 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
608 | death = time(NULL) + buffer_get_int(&e->request); | |
609 | break; | |
610 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
611 | confirm = 1; | |
612 | break; | |
613 | default: | |
614 | break; | |
615 | } | |
616 | } | |
617 | if (lifetime && !death) | |
618 | death = time(NULL) + lifetime; | |
619 | ||
df84fde0 | 620 | keys = sc_get_keys(sc_reader_id, pin); |
3c0ef626 | 621 | xfree(sc_reader_id); |
df84fde0 | 622 | xfree(pin); |
3c0ef626 | 623 | |
df84fde0 | 624 | if (keys == NULL || keys[0] == NULL) { |
625 | error("sc_get_keys failed"); | |
3c0ef626 | 626 | goto send; |
627 | } | |
df84fde0 | 628 | for (i = 0; keys[i] != NULL; i++) { |
629 | k = keys[i]; | |
630 | version = k->type == KEY_RSA1 ? 1 : 2; | |
631 | tab = idtab_lookup(version); | |
632 | if (lookup_identity(k, version) == NULL) { | |
633 | id = xmalloc(sizeof(Identity)); | |
634 | id->key = k; | |
7cac2b65 | 635 | id->comment = sc_get_key_label(k); |
636 | id->death = death; | |
637 | id->confirm = confirm; | |
df84fde0 | 638 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
639 | tab->nentries++; | |
640 | success = 1; | |
641 | } else { | |
642 | key_free(k); | |
643 | } | |
644 | keys[i] = NULL; | |
3c0ef626 | 645 | } |
df84fde0 | 646 | xfree(keys); |
3c0ef626 | 647 | send: |
648 | buffer_put_int(&e->output, 1); | |
649 | buffer_put_char(&e->output, | |
650 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
651 | } | |
652 | ||
653 | static void | |
654 | process_remove_smartcard_key(SocketEntry *e) | |
655 | { | |
df84fde0 | 656 | char *sc_reader_id = NULL, *pin; |
657 | int i, version, success = 0; | |
276b07a3 | 658 | Key **keys, *k = NULL; |
659 | Identity *id; | |
660 | Idtab *tab; | |
3c0ef626 | 661 | |
df84fde0 | 662 | sc_reader_id = buffer_get_string(&e->request, NULL); |
663 | pin = buffer_get_string(&e->request, NULL); | |
664 | keys = sc_get_keys(sc_reader_id, pin); | |
3c0ef626 | 665 | xfree(sc_reader_id); |
df84fde0 | 666 | xfree(pin); |
3c0ef626 | 667 | |
df84fde0 | 668 | if (keys == NULL || keys[0] == NULL) { |
669 | error("sc_get_keys failed"); | |
670 | goto send; | |
671 | } | |
672 | for (i = 0; keys[i] != NULL; i++) { | |
673 | k = keys[i]; | |
674 | version = k->type == KEY_RSA1 ? 1 : 2; | |
675 | if ((id = lookup_identity(k, version)) != NULL) { | |
676 | tab = idtab_lookup(version); | |
677 | TAILQ_REMOVE(&tab->idlist, id, next); | |
3c0ef626 | 678 | tab->nentries--; |
df84fde0 | 679 | free_identity(id); |
3c0ef626 | 680 | success = 1; |
681 | } | |
682 | key_free(k); | |
df84fde0 | 683 | keys[i] = NULL; |
3c0ef626 | 684 | } |
df84fde0 | 685 | xfree(keys); |
686 | send: | |
3c0ef626 | 687 | buffer_put_int(&e->output, 1); |
688 | buffer_put_char(&e->output, | |
689 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
690 | } | |
691 | #endif /* SMARTCARD */ | |
692 | ||
693 | /* dispatch incoming messages */ | |
694 | ||
695 | static void | |
696 | process_message(SocketEntry *e) | |
697 | { | |
276b07a3 | 698 | u_int msg_len, type; |
3c0ef626 | 699 | u_char *cp; |
df84fde0 | 700 | |
701 | /* kill dead keys */ | |
702 | reaper(); | |
703 | ||
3c0ef626 | 704 | if (buffer_len(&e->input) < 5) |
705 | return; /* Incomplete message. */ | |
df84fde0 | 706 | cp = buffer_ptr(&e->input); |
30460aeb | 707 | msg_len = get_u32(cp); |
3c0ef626 | 708 | if (msg_len > 256 * 1024) { |
d03f4262 | 709 | close_socket(e); |
3c0ef626 | 710 | return; |
711 | } | |
712 | if (buffer_len(&e->input) < msg_len + 4) | |
713 | return; | |
df84fde0 | 714 | |
715 | /* move the current input to e->request */ | |
3c0ef626 | 716 | buffer_consume(&e->input, 4); |
df84fde0 | 717 | buffer_clear(&e->request); |
718 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
719 | buffer_consume(&e->input, msg_len); | |
720 | type = buffer_get_char(&e->request); | |
721 | ||
722 | /* check wheter agent is locked */ | |
723 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
724 | buffer_clear(&e->request); | |
725 | switch (type) { | |
726 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
727 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
728 | /* send empty lists */ | |
729 | no_identities(e, type); | |
730 | break; | |
731 | default: | |
732 | /* send a fail message for all other request types */ | |
733 | buffer_put_int(&e->output, 1); | |
734 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
735 | } | |
736 | return; | |
737 | } | |
3c0ef626 | 738 | |
739 | debug("type %d", type); | |
740 | switch (type) { | |
df84fde0 | 741 | case SSH_AGENTC_LOCK: |
742 | case SSH_AGENTC_UNLOCK: | |
743 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
744 | break; | |
3c0ef626 | 745 | /* ssh1 */ |
746 | case SSH_AGENTC_RSA_CHALLENGE: | |
747 | process_authentication_challenge1(e); | |
748 | break; | |
749 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
750 | process_request_identities(e, 1); | |
751 | break; | |
752 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
df84fde0 | 753 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
3c0ef626 | 754 | process_add_identity(e, 1); |
755 | break; | |
756 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
757 | process_remove_identity(e, 1); | |
758 | break; | |
759 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
760 | process_remove_all_identities(e, 1); | |
761 | break; | |
762 | /* ssh2 */ | |
763 | case SSH2_AGENTC_SIGN_REQUEST: | |
764 | process_sign_request2(e); | |
765 | break; | |
766 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
767 | process_request_identities(e, 2); | |
768 | break; | |
769 | case SSH2_AGENTC_ADD_IDENTITY: | |
df84fde0 | 770 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
3c0ef626 | 771 | process_add_identity(e, 2); |
772 | break; | |
773 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
774 | process_remove_identity(e, 2); | |
775 | break; | |
776 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
777 | process_remove_all_identities(e, 2); | |
778 | break; | |
779 | #ifdef SMARTCARD | |
780 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
7cac2b65 | 781 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: |
3c0ef626 | 782 | process_add_smartcard_key(e); |
df84fde0 | 783 | break; |
3c0ef626 | 784 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
785 | process_remove_smartcard_key(e); | |
df84fde0 | 786 | break; |
3c0ef626 | 787 | #endif /* SMARTCARD */ |
788 | default: | |
789 | /* Unknown message. Respond with failure. */ | |
790 | error("Unknown message %d", type); | |
df84fde0 | 791 | buffer_clear(&e->request); |
3c0ef626 | 792 | buffer_put_int(&e->output, 1); |
793 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
794 | break; | |
795 | } | |
796 | } | |
797 | ||
798 | static void | |
df84fde0 | 799 | new_socket(sock_type type, int fd) |
3c0ef626 | 800 | { |
29d88157 | 801 | u_int i, old_alloc, new_alloc; |
276b07a3 | 802 | |
7e82606e | 803 | set_nonblock(fd); |
3c0ef626 | 804 | |
805 | if (fd > max_fd) | |
806 | max_fd = fd; | |
807 | ||
808 | for (i = 0; i < sockets_alloc; i++) | |
809 | if (sockets[i].type == AUTH_UNUSED) { | |
810 | sockets[i].fd = fd; | |
3c0ef626 | 811 | buffer_init(&sockets[i].input); |
812 | buffer_init(&sockets[i].output); | |
df84fde0 | 813 | buffer_init(&sockets[i].request); |
29d88157 | 814 | sockets[i].type = type; |
3c0ef626 | 815 | return; |
816 | } | |
817 | old_alloc = sockets_alloc; | |
29d88157 | 818 | new_alloc = sockets_alloc + 10; |
30460aeb | 819 | sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); |
29d88157 | 820 | for (i = old_alloc; i < new_alloc; i++) |
3c0ef626 | 821 | sockets[i].type = AUTH_UNUSED; |
29d88157 | 822 | sockets_alloc = new_alloc; |
3c0ef626 | 823 | sockets[old_alloc].fd = fd; |
824 | buffer_init(&sockets[old_alloc].input); | |
825 | buffer_init(&sockets[old_alloc].output); | |
df84fde0 | 826 | buffer_init(&sockets[old_alloc].request); |
29d88157 | 827 | sockets[old_alloc].type = type; |
3c0ef626 | 828 | } |
829 | ||
830 | static int | |
7e82606e | 831 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp) |
3c0ef626 | 832 | { |
833 | u_int i, sz; | |
834 | int n = 0; | |
835 | ||
836 | for (i = 0; i < sockets_alloc; i++) { | |
837 | switch (sockets[i].type) { | |
838 | case AUTH_SOCKET: | |
839 | case AUTH_CONNECTION: | |
840 | n = MAX(n, sockets[i].fd); | |
841 | break; | |
842 | case AUTH_UNUSED: | |
843 | break; | |
844 | default: | |
845 | fatal("Unknown socket type %d", sockets[i].type); | |
846 | break; | |
847 | } | |
848 | } | |
849 | ||
850 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
851 | if (*fdrp == NULL || sz > *nallocp) { | |
852 | if (*fdrp) | |
853 | xfree(*fdrp); | |
854 | if (*fdwp) | |
855 | xfree(*fdwp); | |
856 | *fdrp = xmalloc(sz); | |
857 | *fdwp = xmalloc(sz); | |
858 | *nallocp = sz; | |
859 | } | |
860 | if (n < *fdl) | |
861 | debug("XXX shrink: %d < %d", n, *fdl); | |
862 | *fdl = n; | |
863 | memset(*fdrp, 0, sz); | |
864 | memset(*fdwp, 0, sz); | |
865 | ||
866 | for (i = 0; i < sockets_alloc; i++) { | |
867 | switch (sockets[i].type) { | |
868 | case AUTH_SOCKET: | |
869 | case AUTH_CONNECTION: | |
870 | FD_SET(sockets[i].fd, *fdrp); | |
871 | if (buffer_len(&sockets[i].output) > 0) | |
872 | FD_SET(sockets[i].fd, *fdwp); | |
873 | break; | |
874 | default: | |
875 | break; | |
876 | } | |
877 | } | |
878 | return (1); | |
879 | } | |
880 | ||
881 | static void | |
882 | after_select(fd_set *readset, fd_set *writeset) | |
883 | { | |
276b07a3 | 884 | struct sockaddr_un sunaddr; |
3c0ef626 | 885 | socklen_t slen; |
886 | char buf[1024]; | |
276b07a3 | 887 | int len, sock; |
888 | u_int i; | |
d03f4262 | 889 | uid_t euid; |
890 | gid_t egid; | |
3c0ef626 | 891 | |
892 | for (i = 0; i < sockets_alloc; i++) | |
893 | switch (sockets[i].type) { | |
894 | case AUTH_UNUSED: | |
895 | break; | |
896 | case AUTH_SOCKET: | |
897 | if (FD_ISSET(sockets[i].fd, readset)) { | |
898 | slen = sizeof(sunaddr); | |
899 | sock = accept(sockets[i].fd, | |
30460aeb | 900 | (struct sockaddr *)&sunaddr, &slen); |
3c0ef626 | 901 | if (sock < 0) { |
df84fde0 | 902 | error("accept from AUTH_SOCKET: %s", |
903 | strerror(errno)); | |
3c0ef626 | 904 | break; |
905 | } | |
d03f4262 | 906 | if (getpeereid(sock, &euid, &egid) < 0) { |
907 | error("getpeereid %d failed: %s", | |
908 | sock, strerror(errno)); | |
909 | close(sock); | |
910 | break; | |
911 | } | |
912 | if ((euid != 0) && (getuid() != euid)) { | |
913 | error("uid mismatch: " | |
914 | "peer euid %u != uid %u", | |
915 | (u_int) euid, (u_int) getuid()); | |
916 | close(sock); | |
917 | break; | |
918 | } | |
3c0ef626 | 919 | new_socket(AUTH_CONNECTION, sock); |
920 | } | |
921 | break; | |
922 | case AUTH_CONNECTION: | |
923 | if (buffer_len(&sockets[i].output) > 0 && | |
924 | FD_ISSET(sockets[i].fd, writeset)) { | |
925 | do { | |
926 | len = write(sockets[i].fd, | |
927 | buffer_ptr(&sockets[i].output), | |
928 | buffer_len(&sockets[i].output)); | |
929 | if (len == -1 && (errno == EAGAIN || | |
930 | errno == EINTR)) | |
931 | continue; | |
932 | break; | |
933 | } while (1); | |
934 | if (len <= 0) { | |
d03f4262 | 935 | close_socket(&sockets[i]); |
3c0ef626 | 936 | break; |
937 | } | |
938 | buffer_consume(&sockets[i].output, len); | |
939 | } | |
940 | if (FD_ISSET(sockets[i].fd, readset)) { | |
941 | do { | |
942 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
943 | if (len == -1 && (errno == EAGAIN || | |
944 | errno == EINTR)) | |
945 | continue; | |
946 | break; | |
947 | } while (1); | |
948 | if (len <= 0) { | |
d03f4262 | 949 | close_socket(&sockets[i]); |
3c0ef626 | 950 | break; |
951 | } | |
952 | buffer_append(&sockets[i].input, buf, len); | |
953 | process_message(&sockets[i]); | |
954 | } | |
955 | break; | |
956 | default: | |
957 | fatal("Unknown type %d", sockets[i].type); | |
958 | } | |
959 | } | |
960 | ||
961 | static void | |
540d72c3 | 962 | cleanup_socket(void) |
3c0ef626 | 963 | { |
964 | if (socket_name[0]) | |
965 | unlink(socket_name); | |
966 | if (socket_dir[0]) | |
967 | rmdir(socket_dir); | |
968 | } | |
969 | ||
540d72c3 | 970 | void |
3c0ef626 | 971 | cleanup_exit(int i) |
972 | { | |
540d72c3 | 973 | cleanup_socket(); |
974 | _exit(i); | |
3c0ef626 | 975 | } |
976 | ||
30460aeb | 977 | /*ARGSUSED*/ |
3c0ef626 | 978 | static void |
979 | cleanup_handler(int sig) | |
980 | { | |
540d72c3 | 981 | cleanup_socket(); |
3c0ef626 | 982 | _exit(2); |
983 | } | |
984 | ||
30460aeb | 985 | /*ARGSUSED*/ |
3c0ef626 | 986 | static void |
987 | check_parent_exists(int sig) | |
988 | { | |
989 | int save_errno = errno; | |
990 | ||
991 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
992 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
993 | cleanup_handler(sig); /* safe */ | |
994 | } | |
7cac2b65 | 995 | mysignal(SIGALRM, check_parent_exists); |
3c0ef626 | 996 | alarm(10); |
997 | errno = save_errno; | |
998 | } | |
999 | ||
1000 | static void | |
1001 | usage(void) | |
1002 | { | |
1003 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", | |
1004 | __progname); | |
1005 | fprintf(stderr, "Options:\n"); | |
1006 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
1007 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
1008 | fprintf(stderr, " -k Kill the current agent.\n"); | |
1009 | fprintf(stderr, " -d Debug mode.\n"); | |
df84fde0 | 1010 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
bfe49944 | 1011 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); |
3c0ef626 | 1012 | exit(1); |
1013 | } | |
1014 | ||
1015 | int | |
1016 | main(int ac, char **av) | |
1017 | { | |
bfe49944 | 1018 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; |
30460aeb | 1019 | int sock, fd, ch; |
7e82606e | 1020 | u_int nalloc; |
276b07a3 | 1021 | char *shell, *format, *pidstr, *agentsocket = NULL; |
1022 | fd_set *readsetp = NULL, *writesetp = NULL; | |
3c0ef626 | 1023 | struct sockaddr_un sunaddr; |
1024 | #ifdef HAVE_SETRLIMIT | |
1025 | struct rlimit rlim; | |
1026 | #endif | |
3c0ef626 | 1027 | int prev_mask; |
3c0ef626 | 1028 | extern int optind; |
276b07a3 | 1029 | extern char *optarg; |
1030 | pid_t pid; | |
1031 | char pidstrbuf[1 + 3 * sizeof pid]; | |
3c0ef626 | 1032 | |
08822d99 | 1033 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
1034 | sanitise_stdfd(); | |
1035 | ||
d03f4262 | 1036 | /* drop */ |
1037 | setegid(getgid()); | |
1038 | setgid(getgid()); | |
1039 | ||
12a403af | 1040 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) |
1041 | /* Disable ptrace on Linux without sgid bit */ | |
1042 | prctl(PR_SET_DUMPABLE, 0); | |
1043 | #endif | |
1044 | ||
3c0ef626 | 1045 | SSLeay_add_all_algorithms(); |
1046 | ||
7cac2b65 | 1047 | __progname = ssh_get_progname(av[0]); |
3c0ef626 | 1048 | init_rng(); |
1049 | seed_rng(); | |
1050 | ||
bfe49944 | 1051 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { |
3c0ef626 | 1052 | switch (ch) { |
1053 | case 'c': | |
1054 | if (s_flag) | |
1055 | usage(); | |
1056 | c_flag++; | |
1057 | break; | |
1058 | case 'k': | |
1059 | k_flag++; | |
1060 | break; | |
1061 | case 's': | |
1062 | if (c_flag) | |
1063 | usage(); | |
1064 | s_flag++; | |
1065 | break; | |
1066 | case 'd': | |
1067 | if (d_flag) | |
1068 | usage(); | |
1069 | d_flag++; | |
1070 | break; | |
df84fde0 | 1071 | case 'a': |
1072 | agentsocket = optarg; | |
1073 | break; | |
bfe49944 | 1074 | case 't': |
1075 | if ((lifetime = convtime(optarg)) == -1) { | |
1076 | fprintf(stderr, "Invalid lifetime\n"); | |
1077 | usage(); | |
1078 | } | |
1079 | break; | |
3c0ef626 | 1080 | default: |
1081 | usage(); | |
1082 | } | |
1083 | } | |
1084 | ac -= optind; | |
1085 | av += optind; | |
1086 | ||
1087 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) | |
1088 | usage(); | |
1089 | ||
df84fde0 | 1090 | if (ac == 0 && !c_flag && !s_flag) { |
3c0ef626 | 1091 | shell = getenv("SHELL"); |
30460aeb | 1092 | if (shell != NULL && |
1093 | strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
3c0ef626 | 1094 | c_flag = 1; |
1095 | } | |
1096 | if (k_flag) { | |
30460aeb | 1097 | const char *errstr = NULL; |
1098 | ||
3c0ef626 | 1099 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
1100 | if (pidstr == NULL) { | |
1101 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
1102 | SSH_AGENTPID_ENV_NAME); | |
1103 | exit(1); | |
1104 | } | |
30460aeb | 1105 | pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); |
1106 | if (errstr) { | |
1107 | fprintf(stderr, | |
1108 | "%s=\"%s\", which is not a good PID: %s\n", | |
1109 | SSH_AGENTPID_ENV_NAME, pidstr, errstr); | |
3c0ef626 | 1110 | exit(1); |
1111 | } | |
1112 | if (kill(pid, SIGTERM) == -1) { | |
1113 | perror("kill"); | |
1114 | exit(1); | |
1115 | } | |
1116 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1117 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1118 | printf(format, SSH_AGENTPID_ENV_NAME); | |
df84fde0 | 1119 | printf("echo Agent pid %ld killed;\n", (long)pid); |
3c0ef626 | 1120 | exit(0); |
1121 | } | |
1122 | parent_pid = getpid(); | |
1123 | ||
df84fde0 | 1124 | if (agentsocket == NULL) { |
1125 | /* Create private directory for agent socket */ | |
540d72c3 | 1126 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir); |
df84fde0 | 1127 | if (mkdtemp(socket_dir) == NULL) { |
1128 | perror("mkdtemp: private socket dir"); | |
1129 | exit(1); | |
1130 | } | |
1131 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, | |
1132 | (long)parent_pid); | |
1133 | } else { | |
1134 | /* Try to use specified agent socket */ | |
1135 | socket_dir[0] = '\0'; | |
1136 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
3c0ef626 | 1137 | } |
3c0ef626 | 1138 | |
1139 | /* | |
1140 | * Create socket early so it will exist before command gets run from | |
1141 | * the parent. | |
1142 | */ | |
1143 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1144 | if (sock < 0) { | |
1145 | perror("socket"); | |
dfddba3d | 1146 | *socket_name = '\0'; /* Don't unlink any existing file */ |
3c0ef626 | 1147 | cleanup_exit(1); |
1148 | } | |
1149 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1150 | sunaddr.sun_family = AF_UNIX; | |
1151 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
3c0ef626 | 1152 | prev_mask = umask(0177); |
30460aeb | 1153 | if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { |
3c0ef626 | 1154 | perror("bind"); |
dfddba3d | 1155 | *socket_name = '\0'; /* Don't unlink any existing file */ |
3c0ef626 | 1156 | umask(prev_mask); |
3c0ef626 | 1157 | cleanup_exit(1); |
1158 | } | |
3c0ef626 | 1159 | umask(prev_mask); |
540d72c3 | 1160 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
3c0ef626 | 1161 | perror("listen"); |
1162 | cleanup_exit(1); | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Fork, and have the parent execute the command, if any, or present | |
1167 | * the socket data. The child continues as the authentication agent. | |
1168 | */ | |
1169 | if (d_flag) { | |
1170 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1171 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1172 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1173 | SSH_AUTHSOCKET_ENV_NAME); | |
df84fde0 | 1174 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
3c0ef626 | 1175 | goto skip; |
1176 | } | |
1177 | pid = fork(); | |
1178 | if (pid == -1) { | |
1179 | perror("fork"); | |
df84fde0 | 1180 | cleanup_exit(1); |
3c0ef626 | 1181 | } |
1182 | if (pid != 0) { /* Parent - execute the given command. */ | |
1183 | close(sock); | |
df84fde0 | 1184 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
3c0ef626 | 1185 | if (ac == 0) { |
1186 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1187 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1188 | SSH_AUTHSOCKET_ENV_NAME); | |
1189 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, | |
1190 | SSH_AGENTPID_ENV_NAME); | |
df84fde0 | 1191 | printf("echo Agent pid %ld;\n", (long)pid); |
3c0ef626 | 1192 | exit(0); |
1193 | } | |
1194 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || | |
1195 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1196 | perror("setenv"); | |
1197 | exit(1); | |
1198 | } | |
1199 | execvp(av[0], av); | |
1200 | perror(av[0]); | |
1201 | exit(1); | |
1202 | } | |
df84fde0 | 1203 | /* child */ |
1204 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
3c0ef626 | 1205 | |
1206 | if (setsid() == -1) { | |
df84fde0 | 1207 | error("setsid: %s", strerror(errno)); |
3c0ef626 | 1208 | cleanup_exit(1); |
1209 | } | |
1210 | ||
1211 | (void)chdir("/"); | |
bfe49944 | 1212 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
1213 | /* XXX might close listen socket */ | |
1214 | (void)dup2(fd, STDIN_FILENO); | |
1215 | (void)dup2(fd, STDOUT_FILENO); | |
1216 | (void)dup2(fd, STDERR_FILENO); | |
1217 | if (fd > 2) | |
1218 | close(fd); | |
1219 | } | |
3c0ef626 | 1220 | |
1221 | #ifdef HAVE_SETRLIMIT | |
1222 | /* deny core dumps, since memory contains unencrypted private keys */ | |
1223 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1224 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
df84fde0 | 1225 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
3c0ef626 | 1226 | cleanup_exit(1); |
1227 | } | |
1228 | #endif | |
1229 | ||
1230 | skip: | |
3c0ef626 | 1231 | new_socket(AUTH_SOCKET, sock); |
1232 | if (ac > 0) { | |
7cac2b65 | 1233 | mysignal(SIGALRM, check_parent_exists); |
3c0ef626 | 1234 | alarm(10); |
1235 | } | |
1236 | idtab_init(); | |
1237 | if (!d_flag) | |
1238 | signal(SIGINT, SIG_IGN); | |
1239 | signal(SIGPIPE, SIG_IGN); | |
1240 | signal(SIGHUP, cleanup_handler); | |
1241 | signal(SIGTERM, cleanup_handler); | |
1242 | nalloc = 0; | |
1243 | ||
1244 | while (1) { | |
1245 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); | |
1246 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { | |
1247 | if (errno == EINTR) | |
1248 | continue; | |
df84fde0 | 1249 | fatal("select: %s", strerror(errno)); |
3c0ef626 | 1250 | } |
1251 | after_select(readsetp, writesetp); | |
1252 | } | |
1253 | /* NOTREACHED */ | |
1254 | } |