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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * The authentication agent program. | |
6 | * | |
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 | * | |
13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
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. | |
34 | */ | |
35 | ||
36 | #include "includes.h" | |
d03f4262 | 37 | #include "openbsd-compat/sys-queue.h" |
540d72c3 | 38 | RCSID("$OpenBSD: ssh-agent.c,v 1.117 2003/12/02 17:01:15 markus Exp $"); |
3c0ef626 | 39 | |
40 | #include <openssl/evp.h> | |
41 | #include <openssl/md5.h> | |
42 | ||
43 | #include "ssh.h" | |
44 | #include "rsa.h" | |
45 | #include "buffer.h" | |
46 | #include "bufaux.h" | |
47 | #include "xmalloc.h" | |
3c0ef626 | 48 | #include "getput.h" |
3c0ef626 | 49 | #include "key.h" |
50 | #include "authfd.h" | |
3c0ef626 | 51 | #include "compat.h" |
52 | #include "log.h" | |
bfe49944 | 53 | #include "readpass.h" |
54 | #include "misc.h" | |
3c0ef626 | 55 | |
56 | #ifdef SMARTCARD | |
3c0ef626 | 57 | #include "scard.h" |
58 | #endif | |
59 | ||
12a403af | 60 | #if defined(HAVE_SYS_PRCTL_H) |
61 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ | |
62 | #endif | |
63 | ||
df84fde0 | 64 | typedef enum { |
65 | AUTH_UNUSED, | |
66 | AUTH_SOCKET, | |
67 | AUTH_CONNECTION | |
68 | } sock_type; | |
69 | ||
3c0ef626 | 70 | typedef struct { |
71 | int fd; | |
df84fde0 | 72 | sock_type type; |
3c0ef626 | 73 | Buffer input; |
74 | Buffer output; | |
df84fde0 | 75 | Buffer request; |
3c0ef626 | 76 | } SocketEntry; |
77 | ||
78 | u_int sockets_alloc = 0; | |
79 | SocketEntry *sockets = NULL; | |
80 | ||
df84fde0 | 81 | typedef struct identity { |
82 | TAILQ_ENTRY(identity) next; | |
3c0ef626 | 83 | Key *key; |
84 | char *comment; | |
df84fde0 | 85 | u_int death; |
bfe49944 | 86 | u_int confirm; |
3c0ef626 | 87 | } Identity; |
88 | ||
89 | typedef struct { | |
90 | int nentries; | |
df84fde0 | 91 | TAILQ_HEAD(idqueue, identity) idlist; |
3c0ef626 | 92 | } Idtab; |
93 | ||
94 | /* private key table, one per protocol version */ | |
95 | Idtab idtable[3]; | |
96 | ||
97 | int max_fd = 0; | |
98 | ||
99 | /* pid of shell == parent of agent */ | |
100 | pid_t parent_pid = -1; | |
101 | ||
102 | /* pathname and directory for AUTH_SOCKET */ | |
103 | char socket_name[1024]; | |
104 | char socket_dir[1024]; | |
105 | ||
df84fde0 | 106 | /* locking */ |
107 | int locked = 0; | |
108 | char *lock_passwd = NULL; | |
109 | ||
3c0ef626 | 110 | #ifdef HAVE___PROGNAME |
111 | extern char *__progname; | |
112 | #else | |
113 | char *__progname; | |
114 | #endif | |
115 | ||
bfe49944 | 116 | /* Default lifetime (0 == forever) */ |
117 | static int lifetime = 0; | |
118 | ||
d03f4262 | 119 | static void |
120 | close_socket(SocketEntry *e) | |
121 | { | |
122 | close(e->fd); | |
123 | e->fd = -1; | |
124 | e->type = AUTH_UNUSED; | |
125 | buffer_free(&e->input); | |
126 | buffer_free(&e->output); | |
127 | buffer_free(&e->request); | |
128 | } | |
129 | ||
3c0ef626 | 130 | static void |
131 | idtab_init(void) | |
132 | { | |
133 | int i; | |
276b07a3 | 134 | |
df84fde0 | 135 | for (i = 0; i <=2; i++) { |
136 | TAILQ_INIT(&idtable[i].idlist); | |
3c0ef626 | 137 | idtable[i].nentries = 0; |
138 | } | |
139 | } | |
140 | ||
141 | /* return private key table for requested protocol version */ | |
142 | static Idtab * | |
143 | idtab_lookup(int version) | |
144 | { | |
145 | if (version < 1 || version > 2) | |
146 | fatal("internal error, bad protocol version %d", version); | |
147 | return &idtable[version]; | |
148 | } | |
149 | ||
df84fde0 | 150 | static void |
151 | free_identity(Identity *id) | |
152 | { | |
153 | key_free(id->key); | |
154 | xfree(id->comment); | |
155 | xfree(id); | |
156 | } | |
157 | ||
3c0ef626 | 158 | /* return matching private key for given public key */ |
df84fde0 | 159 | static Identity * |
160 | lookup_identity(Key *key, int version) | |
3c0ef626 | 161 | { |
df84fde0 | 162 | Identity *id; |
163 | ||
3c0ef626 | 164 | Idtab *tab = idtab_lookup(version); |
df84fde0 | 165 | TAILQ_FOREACH(id, &tab->idlist, next) { |
166 | if (key_equal(key, id->key)) | |
167 | return (id); | |
3c0ef626 | 168 | } |
df84fde0 | 169 | return (NULL); |
3c0ef626 | 170 | } |
171 | ||
bfe49944 | 172 | /* Check confirmation of keysign request */ |
173 | static int | |
174 | confirm_key(Identity *id) | |
175 | { | |
176 | char *p, prompt[1024]; | |
177 | int ret = -1; | |
178 | ||
179 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
180 | snprintf(prompt, sizeof(prompt), "Allow use of key %s?\n" | |
181 | "Key fingerprint %s.", id->comment, p); | |
182 | xfree(p); | |
183 | p = read_passphrase(prompt, RP_ALLOW_EOF); | |
184 | if (p != NULL) { | |
185 | /* | |
540d72c3 | 186 | * Accept empty responses and responses consisting |
bfe49944 | 187 | * of the word "yes" as affirmative. |
188 | */ | |
189 | if (*p == '\0' || *p == '\n' || strcasecmp(p, "yes") == 0) | |
190 | ret = 0; | |
191 | xfree(p); | |
192 | } | |
193 | return (ret); | |
194 | } | |
195 | ||
3c0ef626 | 196 | /* send list of supported public keys to 'client' */ |
197 | static void | |
198 | process_request_identities(SocketEntry *e, int version) | |
199 | { | |
200 | Idtab *tab = idtab_lookup(version); | |
df84fde0 | 201 | Identity *id; |
276b07a3 | 202 | Buffer msg; |
3c0ef626 | 203 | |
204 | buffer_init(&msg); | |
205 | buffer_put_char(&msg, (version == 1) ? | |
206 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
207 | buffer_put_int(&msg, tab->nentries); | |
df84fde0 | 208 | TAILQ_FOREACH(id, &tab->idlist, next) { |
3c0ef626 | 209 | if (id->key->type == KEY_RSA1) { |
210 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); | |
211 | buffer_put_bignum(&msg, id->key->rsa->e); | |
212 | buffer_put_bignum(&msg, id->key->rsa->n); | |
213 | } else { | |
214 | u_char *blob; | |
215 | u_int blen; | |
216 | key_to_blob(id->key, &blob, &blen); | |
217 | buffer_put_string(&msg, blob, blen); | |
218 | xfree(blob); | |
219 | } | |
220 | buffer_put_cstring(&msg, id->comment); | |
221 | } | |
222 | buffer_put_int(&e->output, buffer_len(&msg)); | |
223 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
224 | buffer_free(&msg); | |
225 | } | |
226 | ||
227 | /* ssh1 only */ | |
228 | static void | |
229 | process_authentication_challenge1(SocketEntry *e) | |
230 | { | |
276b07a3 | 231 | u_char buf[32], mdbuf[16], session_id[16]; |
232 | u_int response_type; | |
3c0ef626 | 233 | BIGNUM *challenge; |
276b07a3 | 234 | Identity *id; |
3c0ef626 | 235 | int i, len; |
236 | Buffer msg; | |
237 | MD5_CTX md; | |
276b07a3 | 238 | Key *key; |
3c0ef626 | 239 | |
240 | buffer_init(&msg); | |
241 | key = key_new(KEY_RSA1); | |
df84fde0 | 242 | if ((challenge = BN_new()) == NULL) |
243 | fatal("process_authentication_challenge1: BN_new failed"); | |
3c0ef626 | 244 | |
276b07a3 | 245 | (void) buffer_get_int(&e->request); /* ignored */ |
df84fde0 | 246 | buffer_get_bignum(&e->request, key->rsa->e); |
247 | buffer_get_bignum(&e->request, key->rsa->n); | |
248 | buffer_get_bignum(&e->request, challenge); | |
3c0ef626 | 249 | |
250 | /* Only protocol 1.1 is supported */ | |
df84fde0 | 251 | if (buffer_len(&e->request) == 0) |
3c0ef626 | 252 | goto failure; |
df84fde0 | 253 | buffer_get(&e->request, session_id, 16); |
254 | response_type = buffer_get_int(&e->request); | |
3c0ef626 | 255 | if (response_type != 1) |
256 | goto failure; | |
257 | ||
df84fde0 | 258 | id = lookup_identity(key, 1); |
bfe49944 | 259 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { |
df84fde0 | 260 | Key *private = id->key; |
3c0ef626 | 261 | /* Decrypt the challenge using the private key. */ |
262 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) | |
263 | goto failure; | |
264 | ||
265 | /* The response is MD5 of decrypted challenge plus session id. */ | |
266 | len = BN_num_bytes(challenge); | |
267 | if (len <= 0 || len > 32) { | |
7cac2b65 | 268 | logit("process_authentication_challenge: bad challenge length %d", len); |
3c0ef626 | 269 | goto failure; |
270 | } | |
271 | memset(buf, 0, 32); | |
272 | BN_bn2bin(challenge, buf + 32 - len); | |
273 | MD5_Init(&md); | |
274 | MD5_Update(&md, buf, 32); | |
275 | MD5_Update(&md, session_id, 16); | |
276 | MD5_Final(mdbuf, &md); | |
277 | ||
278 | /* Send the response. */ | |
279 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
280 | for (i = 0; i < 16; i++) | |
281 | buffer_put_char(&msg, mdbuf[i]); | |
282 | goto send; | |
283 | } | |
284 | ||
285 | failure: | |
286 | /* Unknown identity or protocol error. Send failure. */ | |
287 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
288 | send: | |
289 | buffer_put_int(&e->output, buffer_len(&msg)); | |
290 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
291 | key_free(key); | |
292 | BN_clear_free(challenge); | |
293 | buffer_free(&msg); | |
294 | } | |
295 | ||
296 | /* ssh2 only */ | |
297 | static void | |
298 | process_sign_request2(SocketEntry *e) | |
299 | { | |
3c0ef626 | 300 | u_char *blob, *data, *signature = NULL; |
301 | u_int blen, dlen, slen = 0; | |
276b07a3 | 302 | extern int datafellows; |
303 | int ok = -1, flags; | |
3c0ef626 | 304 | Buffer msg; |
276b07a3 | 305 | Key *key; |
3c0ef626 | 306 | |
307 | datafellows = 0; | |
308 | ||
df84fde0 | 309 | blob = buffer_get_string(&e->request, &blen); |
310 | data = buffer_get_string(&e->request, &dlen); | |
3c0ef626 | 311 | |
df84fde0 | 312 | flags = buffer_get_int(&e->request); |
3c0ef626 | 313 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
314 | datafellows = SSH_BUG_SIGBLOB; | |
315 | ||
316 | key = key_from_blob(blob, blen); | |
317 | if (key != NULL) { | |
df84fde0 | 318 | Identity *id = lookup_identity(key, 2); |
bfe49944 | 319 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) |
df84fde0 | 320 | ok = key_sign(id->key, &signature, &slen, data, dlen); |
3c0ef626 | 321 | } |
322 | key_free(key); | |
323 | buffer_init(&msg); | |
324 | if (ok == 0) { | |
325 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
326 | buffer_put_string(&msg, signature, slen); | |
327 | } else { | |
328 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
329 | } | |
330 | buffer_put_int(&e->output, buffer_len(&msg)); | |
331 | buffer_append(&e->output, buffer_ptr(&msg), | |
332 | buffer_len(&msg)); | |
333 | buffer_free(&msg); | |
334 | xfree(data); | |
335 | xfree(blob); | |
336 | if (signature != NULL) | |
337 | xfree(signature); | |
338 | } | |
339 | ||
340 | /* shared */ | |
341 | static void | |
342 | process_remove_identity(SocketEntry *e, int version) | |
343 | { | |
276b07a3 | 344 | u_int blen, bits; |
345 | int success = 0; | |
df84fde0 | 346 | Key *key = NULL; |
3c0ef626 | 347 | u_char *blob; |
3c0ef626 | 348 | |
df84fde0 | 349 | switch (version) { |
3c0ef626 | 350 | case 1: |
351 | key = key_new(KEY_RSA1); | |
df84fde0 | 352 | bits = buffer_get_int(&e->request); |
353 | buffer_get_bignum(&e->request, key->rsa->e); | |
354 | buffer_get_bignum(&e->request, key->rsa->n); | |
3c0ef626 | 355 | |
356 | if (bits != key_size(key)) | |
7cac2b65 | 357 | logit("Warning: identity keysize mismatch: actual %u, announced %u", |
3c0ef626 | 358 | key_size(key), bits); |
359 | break; | |
360 | case 2: | |
df84fde0 | 361 | blob = buffer_get_string(&e->request, &blen); |
3c0ef626 | 362 | key = key_from_blob(blob, blen); |
363 | xfree(blob); | |
364 | break; | |
365 | } | |
366 | if (key != NULL) { | |
df84fde0 | 367 | Identity *id = lookup_identity(key, version); |
368 | if (id != NULL) { | |
3c0ef626 | 369 | /* |
370 | * We have this key. Free the old key. Since we | |
371 | * don\'t want to leave empty slots in the middle of | |
372 | * the array, we actually free the key there and move | |
373 | * all the entries between the empty slot and the end | |
374 | * of the array. | |
375 | */ | |
376 | Idtab *tab = idtab_lookup(version); | |
3c0ef626 | 377 | if (tab->nentries < 1) |
378 | fatal("process_remove_identity: " | |
379 | "internal error: tab->nentries %d", | |
380 | tab->nentries); | |
df84fde0 | 381 | TAILQ_REMOVE(&tab->idlist, id, next); |
382 | free_identity(id); | |
3c0ef626 | 383 | tab->nentries--; |
384 | success = 1; | |
385 | } | |
386 | key_free(key); | |
387 | } | |
388 | buffer_put_int(&e->output, 1); | |
389 | buffer_put_char(&e->output, | |
390 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
391 | } | |
392 | ||
393 | static void | |
394 | process_remove_all_identities(SocketEntry *e, int version) | |
395 | { | |
3c0ef626 | 396 | Idtab *tab = idtab_lookup(version); |
df84fde0 | 397 | Identity *id; |
3c0ef626 | 398 | |
399 | /* Loop over all identities and clear the keys. */ | |
df84fde0 | 400 | for (id = TAILQ_FIRST(&tab->idlist); id; |
401 | id = TAILQ_FIRST(&tab->idlist)) { | |
402 | TAILQ_REMOVE(&tab->idlist, id, next); | |
403 | free_identity(id); | |
3c0ef626 | 404 | } |
405 | ||
406 | /* Mark that there are no identities. */ | |
407 | tab->nentries = 0; | |
408 | ||
409 | /* Send success. */ | |
410 | buffer_put_int(&e->output, 1); | |
411 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
df84fde0 | 412 | } |
413 | ||
414 | static void | |
415 | reaper(void) | |
416 | { | |
276b07a3 | 417 | u_int now = time(NULL); |
df84fde0 | 418 | Identity *id, *nxt; |
419 | int version; | |
276b07a3 | 420 | Idtab *tab; |
df84fde0 | 421 | |
422 | for (version = 1; version < 3; version++) { | |
423 | tab = idtab_lookup(version); | |
424 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
425 | nxt = TAILQ_NEXT(id, next); | |
426 | if (id->death != 0 && now >= id->death) { | |
427 | TAILQ_REMOVE(&tab->idlist, id, next); | |
428 | free_identity(id); | |
429 | tab->nentries--; | |
430 | } | |
431 | } | |
432 | } | |
3c0ef626 | 433 | } |
434 | ||
435 | static void | |
436 | process_add_identity(SocketEntry *e, int version) | |
437 | { | |
3c0ef626 | 438 | Idtab *tab = idtab_lookup(version); |
bfe49944 | 439 | int type, success = 0, death = 0, confirm = 0; |
276b07a3 | 440 | char *type_name, *comment; |
441 | Key *k = NULL; | |
3c0ef626 | 442 | |
443 | switch (version) { | |
444 | case 1: | |
445 | k = key_new_private(KEY_RSA1); | |
276b07a3 | 446 | (void) buffer_get_int(&e->request); /* ignored */ |
df84fde0 | 447 | buffer_get_bignum(&e->request, k->rsa->n); |
448 | buffer_get_bignum(&e->request, k->rsa->e); | |
449 | buffer_get_bignum(&e->request, k->rsa->d); | |
450 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
3c0ef626 | 451 | |
452 | /* SSH and SSL have p and q swapped */ | |
df84fde0 | 453 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
454 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
3c0ef626 | 455 | |
456 | /* Generate additional parameters */ | |
457 | rsa_generate_additional_parameters(k->rsa); | |
458 | break; | |
459 | case 2: | |
df84fde0 | 460 | type_name = buffer_get_string(&e->request, NULL); |
3c0ef626 | 461 | type = key_type_from_name(type_name); |
462 | xfree(type_name); | |
df84fde0 | 463 | switch (type) { |
3c0ef626 | 464 | case KEY_DSA: |
465 | k = key_new_private(type); | |
df84fde0 | 466 | buffer_get_bignum2(&e->request, k->dsa->p); |
467 | buffer_get_bignum2(&e->request, k->dsa->q); | |
468 | buffer_get_bignum2(&e->request, k->dsa->g); | |
469 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
470 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
3c0ef626 | 471 | break; |
472 | case KEY_RSA: | |
473 | k = key_new_private(type); | |
df84fde0 | 474 | buffer_get_bignum2(&e->request, k->rsa->n); |
475 | buffer_get_bignum2(&e->request, k->rsa->e); | |
476 | buffer_get_bignum2(&e->request, k->rsa->d); | |
477 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
478 | buffer_get_bignum2(&e->request, k->rsa->p); | |
479 | buffer_get_bignum2(&e->request, k->rsa->q); | |
3c0ef626 | 480 | |
481 | /* Generate additional parameters */ | |
482 | rsa_generate_additional_parameters(k->rsa); | |
483 | break; | |
484 | default: | |
df84fde0 | 485 | buffer_clear(&e->request); |
3c0ef626 | 486 | goto send; |
487 | } | |
488 | break; | |
489 | } | |
bfe49944 | 490 | /* enable blinding */ |
491 | switch (k->type) { | |
492 | case KEY_RSA: | |
493 | case KEY_RSA1: | |
494 | if (RSA_blinding_on(k->rsa, NULL) != 1) { | |
495 | error("process_add_identity: RSA_blinding_on failed"); | |
496 | key_free(k); | |
497 | goto send; | |
498 | } | |
499 | break; | |
500 | } | |
df84fde0 | 501 | comment = buffer_get_string(&e->request, NULL); |
3c0ef626 | 502 | if (k == NULL) { |
503 | xfree(comment); | |
504 | goto send; | |
505 | } | |
506 | success = 1; | |
df84fde0 | 507 | while (buffer_len(&e->request)) { |
508 | switch (buffer_get_char(&e->request)) { | |
509 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
510 | death = time(NULL) + buffer_get_int(&e->request); | |
511 | break; | |
bfe49944 | 512 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
513 | confirm = 1; | |
514 | break; | |
df84fde0 | 515 | default: |
516 | break; | |
517 | } | |
518 | } | |
bfe49944 | 519 | if (lifetime && !death) |
520 | death = time(NULL) + lifetime; | |
df84fde0 | 521 | if (lookup_identity(k, version) == NULL) { |
522 | Identity *id = xmalloc(sizeof(Identity)); | |
523 | id->key = k; | |
524 | id->comment = comment; | |
525 | id->death = death; | |
bfe49944 | 526 | id->confirm = confirm; |
df84fde0 | 527 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
3c0ef626 | 528 | /* Increment the number of identities. */ |
529 | tab->nentries++; | |
530 | } else { | |
531 | key_free(k); | |
532 | xfree(comment); | |
533 | } | |
534 | send: | |
535 | buffer_put_int(&e->output, 1); | |
536 | buffer_put_char(&e->output, | |
537 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
538 | } | |
539 | ||
df84fde0 | 540 | /* XXX todo: encrypt sensitive data with passphrase */ |
541 | static void | |
542 | process_lock_agent(SocketEntry *e, int lock) | |
543 | { | |
df84fde0 | 544 | int success = 0; |
276b07a3 | 545 | char *passwd; |
df84fde0 | 546 | |
547 | passwd = buffer_get_string(&e->request, NULL); | |
548 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
549 | locked = 0; | |
550 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
551 | xfree(lock_passwd); | |
552 | lock_passwd = NULL; | |
553 | success = 1; | |
554 | } else if (!locked && lock) { | |
555 | locked = 1; | |
556 | lock_passwd = xstrdup(passwd); | |
557 | success = 1; | |
558 | } | |
559 | memset(passwd, 0, strlen(passwd)); | |
560 | xfree(passwd); | |
561 | ||
562 | buffer_put_int(&e->output, 1); | |
563 | buffer_put_char(&e->output, | |
564 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
565 | } | |
566 | ||
567 | static void | |
568 | no_identities(SocketEntry *e, u_int type) | |
569 | { | |
570 | Buffer msg; | |
571 | ||
572 | buffer_init(&msg); | |
573 | buffer_put_char(&msg, | |
574 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
575 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
576 | buffer_put_int(&msg, 0); | |
577 | buffer_put_int(&e->output, buffer_len(&msg)); | |
578 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
579 | buffer_free(&msg); | |
580 | } | |
3c0ef626 | 581 | |
582 | #ifdef SMARTCARD | |
583 | static void | |
584 | process_add_smartcard_key (SocketEntry *e) | |
585 | { | |
df84fde0 | 586 | char *sc_reader_id = NULL, *pin; |
7cac2b65 | 587 | int i, version, success = 0, death = 0, confirm = 0; |
276b07a3 | 588 | Key **keys, *k; |
589 | Identity *id; | |
590 | Idtab *tab; | |
df84fde0 | 591 | |
592 | sc_reader_id = buffer_get_string(&e->request, NULL); | |
593 | pin = buffer_get_string(&e->request, NULL); | |
7cac2b65 | 594 | |
595 | while (buffer_len(&e->request)) { | |
596 | switch (buffer_get_char(&e->request)) { | |
597 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
598 | death = time(NULL) + buffer_get_int(&e->request); | |
599 | break; | |
600 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
601 | confirm = 1; | |
602 | break; | |
603 | default: | |
604 | break; | |
605 | } | |
606 | } | |
607 | if (lifetime && !death) | |
608 | death = time(NULL) + lifetime; | |
609 | ||
df84fde0 | 610 | keys = sc_get_keys(sc_reader_id, pin); |
3c0ef626 | 611 | xfree(sc_reader_id); |
df84fde0 | 612 | xfree(pin); |
3c0ef626 | 613 | |
df84fde0 | 614 | if (keys == NULL || keys[0] == NULL) { |
615 | error("sc_get_keys failed"); | |
3c0ef626 | 616 | goto send; |
617 | } | |
df84fde0 | 618 | for (i = 0; keys[i] != NULL; i++) { |
619 | k = keys[i]; | |
620 | version = k->type == KEY_RSA1 ? 1 : 2; | |
621 | tab = idtab_lookup(version); | |
622 | if (lookup_identity(k, version) == NULL) { | |
623 | id = xmalloc(sizeof(Identity)); | |
624 | id->key = k; | |
7cac2b65 | 625 | id->comment = sc_get_key_label(k); |
626 | id->death = death; | |
627 | id->confirm = confirm; | |
df84fde0 | 628 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
629 | tab->nentries++; | |
630 | success = 1; | |
631 | } else { | |
632 | key_free(k); | |
633 | } | |
634 | keys[i] = NULL; | |
3c0ef626 | 635 | } |
df84fde0 | 636 | xfree(keys); |
3c0ef626 | 637 | send: |
638 | buffer_put_int(&e->output, 1); | |
639 | buffer_put_char(&e->output, | |
640 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
641 | } | |
642 | ||
643 | static void | |
644 | process_remove_smartcard_key(SocketEntry *e) | |
645 | { | |
df84fde0 | 646 | char *sc_reader_id = NULL, *pin; |
647 | int i, version, success = 0; | |
276b07a3 | 648 | Key **keys, *k = NULL; |
649 | Identity *id; | |
650 | Idtab *tab; | |
3c0ef626 | 651 | |
df84fde0 | 652 | sc_reader_id = buffer_get_string(&e->request, NULL); |
653 | pin = buffer_get_string(&e->request, NULL); | |
654 | keys = sc_get_keys(sc_reader_id, pin); | |
3c0ef626 | 655 | xfree(sc_reader_id); |
df84fde0 | 656 | xfree(pin); |
3c0ef626 | 657 | |
df84fde0 | 658 | if (keys == NULL || keys[0] == NULL) { |
659 | error("sc_get_keys failed"); | |
660 | goto send; | |
661 | } | |
662 | for (i = 0; keys[i] != NULL; i++) { | |
663 | k = keys[i]; | |
664 | version = k->type == KEY_RSA1 ? 1 : 2; | |
665 | if ((id = lookup_identity(k, version)) != NULL) { | |
666 | tab = idtab_lookup(version); | |
667 | TAILQ_REMOVE(&tab->idlist, id, next); | |
3c0ef626 | 668 | tab->nentries--; |
df84fde0 | 669 | free_identity(id); |
3c0ef626 | 670 | success = 1; |
671 | } | |
672 | key_free(k); | |
df84fde0 | 673 | keys[i] = NULL; |
3c0ef626 | 674 | } |
df84fde0 | 675 | xfree(keys); |
676 | send: | |
3c0ef626 | 677 | buffer_put_int(&e->output, 1); |
678 | buffer_put_char(&e->output, | |
679 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
680 | } | |
681 | #endif /* SMARTCARD */ | |
682 | ||
683 | /* dispatch incoming messages */ | |
684 | ||
685 | static void | |
686 | process_message(SocketEntry *e) | |
687 | { | |
276b07a3 | 688 | u_int msg_len, type; |
3c0ef626 | 689 | u_char *cp; |
df84fde0 | 690 | |
691 | /* kill dead keys */ | |
692 | reaper(); | |
693 | ||
3c0ef626 | 694 | if (buffer_len(&e->input) < 5) |
695 | return; /* Incomplete message. */ | |
df84fde0 | 696 | cp = buffer_ptr(&e->input); |
3c0ef626 | 697 | msg_len = GET_32BIT(cp); |
698 | if (msg_len > 256 * 1024) { | |
d03f4262 | 699 | close_socket(e); |
3c0ef626 | 700 | return; |
701 | } | |
702 | if (buffer_len(&e->input) < msg_len + 4) | |
703 | return; | |
df84fde0 | 704 | |
705 | /* move the current input to e->request */ | |
3c0ef626 | 706 | buffer_consume(&e->input, 4); |
df84fde0 | 707 | buffer_clear(&e->request); |
708 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
709 | buffer_consume(&e->input, msg_len); | |
710 | type = buffer_get_char(&e->request); | |
711 | ||
712 | /* check wheter agent is locked */ | |
713 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
714 | buffer_clear(&e->request); | |
715 | switch (type) { | |
716 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
717 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
718 | /* send empty lists */ | |
719 | no_identities(e, type); | |
720 | break; | |
721 | default: | |
722 | /* send a fail message for all other request types */ | |
723 | buffer_put_int(&e->output, 1); | |
724 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
725 | } | |
726 | return; | |
727 | } | |
3c0ef626 | 728 | |
729 | debug("type %d", type); | |
730 | switch (type) { | |
df84fde0 | 731 | case SSH_AGENTC_LOCK: |
732 | case SSH_AGENTC_UNLOCK: | |
733 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
734 | break; | |
3c0ef626 | 735 | /* ssh1 */ |
736 | case SSH_AGENTC_RSA_CHALLENGE: | |
737 | process_authentication_challenge1(e); | |
738 | break; | |
739 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
740 | process_request_identities(e, 1); | |
741 | break; | |
742 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
df84fde0 | 743 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
3c0ef626 | 744 | process_add_identity(e, 1); |
745 | break; | |
746 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
747 | process_remove_identity(e, 1); | |
748 | break; | |
749 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
750 | process_remove_all_identities(e, 1); | |
751 | break; | |
752 | /* ssh2 */ | |
753 | case SSH2_AGENTC_SIGN_REQUEST: | |
754 | process_sign_request2(e); | |
755 | break; | |
756 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
757 | process_request_identities(e, 2); | |
758 | break; | |
759 | case SSH2_AGENTC_ADD_IDENTITY: | |
df84fde0 | 760 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
3c0ef626 | 761 | process_add_identity(e, 2); |
762 | break; | |
763 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
764 | process_remove_identity(e, 2); | |
765 | break; | |
766 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
767 | process_remove_all_identities(e, 2); | |
768 | break; | |
769 | #ifdef SMARTCARD | |
770 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
7cac2b65 | 771 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: |
3c0ef626 | 772 | process_add_smartcard_key(e); |
df84fde0 | 773 | break; |
3c0ef626 | 774 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
775 | process_remove_smartcard_key(e); | |
df84fde0 | 776 | break; |
3c0ef626 | 777 | #endif /* SMARTCARD */ |
778 | default: | |
779 | /* Unknown message. Respond with failure. */ | |
780 | error("Unknown message %d", type); | |
df84fde0 | 781 | buffer_clear(&e->request); |
3c0ef626 | 782 | buffer_put_int(&e->output, 1); |
783 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
784 | break; | |
785 | } | |
786 | } | |
787 | ||
788 | static void | |
df84fde0 | 789 | new_socket(sock_type type, int fd) |
3c0ef626 | 790 | { |
29d88157 | 791 | u_int i, old_alloc, new_alloc; |
276b07a3 | 792 | |
3c0ef626 | 793 | if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
794 | error("fcntl O_NONBLOCK: %s", strerror(errno)); | |
795 | ||
796 | if (fd > max_fd) | |
797 | max_fd = fd; | |
798 | ||
799 | for (i = 0; i < sockets_alloc; i++) | |
800 | if (sockets[i].type == AUTH_UNUSED) { | |
801 | sockets[i].fd = fd; | |
3c0ef626 | 802 | buffer_init(&sockets[i].input); |
803 | buffer_init(&sockets[i].output); | |
df84fde0 | 804 | buffer_init(&sockets[i].request); |
29d88157 | 805 | sockets[i].type = type; |
3c0ef626 | 806 | return; |
807 | } | |
808 | old_alloc = sockets_alloc; | |
29d88157 | 809 | new_alloc = sockets_alloc + 10; |
3c0ef626 | 810 | if (sockets) |
29d88157 | 811 | sockets = xrealloc(sockets, new_alloc * sizeof(sockets[0])); |
3c0ef626 | 812 | else |
29d88157 | 813 | sockets = xmalloc(new_alloc * sizeof(sockets[0])); |
814 | for (i = old_alloc; i < new_alloc; i++) | |
3c0ef626 | 815 | sockets[i].type = AUTH_UNUSED; |
29d88157 | 816 | sockets_alloc = new_alloc; |
3c0ef626 | 817 | sockets[old_alloc].fd = fd; |
818 | buffer_init(&sockets[old_alloc].input); | |
819 | buffer_init(&sockets[old_alloc].output); | |
df84fde0 | 820 | buffer_init(&sockets[old_alloc].request); |
29d88157 | 821 | sockets[old_alloc].type = type; |
3c0ef626 | 822 | } |
823 | ||
824 | static int | |
825 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, int *nallocp) | |
826 | { | |
827 | u_int i, sz; | |
828 | int n = 0; | |
829 | ||
830 | for (i = 0; i < sockets_alloc; i++) { | |
831 | switch (sockets[i].type) { | |
832 | case AUTH_SOCKET: | |
833 | case AUTH_CONNECTION: | |
834 | n = MAX(n, sockets[i].fd); | |
835 | break; | |
836 | case AUTH_UNUSED: | |
837 | break; | |
838 | default: | |
839 | fatal("Unknown socket type %d", sockets[i].type); | |
840 | break; | |
841 | } | |
842 | } | |
843 | ||
844 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
845 | if (*fdrp == NULL || sz > *nallocp) { | |
846 | if (*fdrp) | |
847 | xfree(*fdrp); | |
848 | if (*fdwp) | |
849 | xfree(*fdwp); | |
850 | *fdrp = xmalloc(sz); | |
851 | *fdwp = xmalloc(sz); | |
852 | *nallocp = sz; | |
853 | } | |
854 | if (n < *fdl) | |
855 | debug("XXX shrink: %d < %d", n, *fdl); | |
856 | *fdl = n; | |
857 | memset(*fdrp, 0, sz); | |
858 | memset(*fdwp, 0, sz); | |
859 | ||
860 | for (i = 0; i < sockets_alloc; i++) { | |
861 | switch (sockets[i].type) { | |
862 | case AUTH_SOCKET: | |
863 | case AUTH_CONNECTION: | |
864 | FD_SET(sockets[i].fd, *fdrp); | |
865 | if (buffer_len(&sockets[i].output) > 0) | |
866 | FD_SET(sockets[i].fd, *fdwp); | |
867 | break; | |
868 | default: | |
869 | break; | |
870 | } | |
871 | } | |
872 | return (1); | |
873 | } | |
874 | ||
875 | static void | |
876 | after_select(fd_set *readset, fd_set *writeset) | |
877 | { | |
276b07a3 | 878 | struct sockaddr_un sunaddr; |
3c0ef626 | 879 | socklen_t slen; |
880 | char buf[1024]; | |
276b07a3 | 881 | int len, sock; |
882 | u_int i; | |
d03f4262 | 883 | uid_t euid; |
884 | gid_t egid; | |
3c0ef626 | 885 | |
886 | for (i = 0; i < sockets_alloc; i++) | |
887 | switch (sockets[i].type) { | |
888 | case AUTH_UNUSED: | |
889 | break; | |
890 | case AUTH_SOCKET: | |
891 | if (FD_ISSET(sockets[i].fd, readset)) { | |
892 | slen = sizeof(sunaddr); | |
893 | sock = accept(sockets[i].fd, | |
894 | (struct sockaddr *) &sunaddr, &slen); | |
895 | if (sock < 0) { | |
df84fde0 | 896 | error("accept from AUTH_SOCKET: %s", |
897 | strerror(errno)); | |
3c0ef626 | 898 | break; |
899 | } | |
d03f4262 | 900 | if (getpeereid(sock, &euid, &egid) < 0) { |
901 | error("getpeereid %d failed: %s", | |
902 | sock, strerror(errno)); | |
903 | close(sock); | |
904 | break; | |
905 | } | |
906 | if ((euid != 0) && (getuid() != euid)) { | |
907 | error("uid mismatch: " | |
908 | "peer euid %u != uid %u", | |
909 | (u_int) euid, (u_int) getuid()); | |
910 | close(sock); | |
911 | break; | |
912 | } | |
3c0ef626 | 913 | new_socket(AUTH_CONNECTION, sock); |
914 | } | |
915 | break; | |
916 | case AUTH_CONNECTION: | |
917 | if (buffer_len(&sockets[i].output) > 0 && | |
918 | FD_ISSET(sockets[i].fd, writeset)) { | |
919 | do { | |
920 | len = write(sockets[i].fd, | |
921 | buffer_ptr(&sockets[i].output), | |
922 | buffer_len(&sockets[i].output)); | |
923 | if (len == -1 && (errno == EAGAIN || | |
924 | errno == EINTR)) | |
925 | continue; | |
926 | break; | |
927 | } while (1); | |
928 | if (len <= 0) { | |
d03f4262 | 929 | close_socket(&sockets[i]); |
3c0ef626 | 930 | break; |
931 | } | |
932 | buffer_consume(&sockets[i].output, len); | |
933 | } | |
934 | if (FD_ISSET(sockets[i].fd, readset)) { | |
935 | do { | |
936 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
937 | if (len == -1 && (errno == EAGAIN || | |
938 | errno == EINTR)) | |
939 | continue; | |
940 | break; | |
941 | } while (1); | |
942 | if (len <= 0) { | |
d03f4262 | 943 | close_socket(&sockets[i]); |
3c0ef626 | 944 | break; |
945 | } | |
946 | buffer_append(&sockets[i].input, buf, len); | |
947 | process_message(&sockets[i]); | |
948 | } | |
949 | break; | |
950 | default: | |
951 | fatal("Unknown type %d", sockets[i].type); | |
952 | } | |
953 | } | |
954 | ||
955 | static void | |
540d72c3 | 956 | cleanup_socket(void) |
3c0ef626 | 957 | { |
958 | if (socket_name[0]) | |
959 | unlink(socket_name); | |
960 | if (socket_dir[0]) | |
961 | rmdir(socket_dir); | |
962 | } | |
963 | ||
540d72c3 | 964 | void |
3c0ef626 | 965 | cleanup_exit(int i) |
966 | { | |
540d72c3 | 967 | cleanup_socket(); |
968 | _exit(i); | |
3c0ef626 | 969 | } |
970 | ||
971 | static void | |
972 | cleanup_handler(int sig) | |
973 | { | |
540d72c3 | 974 | cleanup_socket(); |
3c0ef626 | 975 | _exit(2); |
976 | } | |
977 | ||
978 | static void | |
979 | check_parent_exists(int sig) | |
980 | { | |
981 | int save_errno = errno; | |
982 | ||
983 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
984 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
985 | cleanup_handler(sig); /* safe */ | |
986 | } | |
7cac2b65 | 987 | mysignal(SIGALRM, check_parent_exists); |
3c0ef626 | 988 | alarm(10); |
989 | errno = save_errno; | |
990 | } | |
991 | ||
992 | static void | |
993 | usage(void) | |
994 | { | |
995 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", | |
996 | __progname); | |
997 | fprintf(stderr, "Options:\n"); | |
998 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
999 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
1000 | fprintf(stderr, " -k Kill the current agent.\n"); | |
1001 | fprintf(stderr, " -d Debug mode.\n"); | |
df84fde0 | 1002 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
bfe49944 | 1003 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); |
3c0ef626 | 1004 | exit(1); |
1005 | } | |
1006 | ||
1007 | int | |
1008 | main(int ac, char **av) | |
1009 | { | |
bfe49944 | 1010 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; |
1011 | int sock, fd, ch, nalloc; | |
276b07a3 | 1012 | char *shell, *format, *pidstr, *agentsocket = NULL; |
1013 | fd_set *readsetp = NULL, *writesetp = NULL; | |
3c0ef626 | 1014 | struct sockaddr_un sunaddr; |
1015 | #ifdef HAVE_SETRLIMIT | |
1016 | struct rlimit rlim; | |
1017 | #endif | |
1018 | #ifdef HAVE_CYGWIN | |
1019 | int prev_mask; | |
1020 | #endif | |
3c0ef626 | 1021 | extern int optind; |
276b07a3 | 1022 | extern char *optarg; |
1023 | pid_t pid; | |
1024 | char pidstrbuf[1 + 3 * sizeof pid]; | |
3c0ef626 | 1025 | |
d03f4262 | 1026 | /* drop */ |
1027 | setegid(getgid()); | |
1028 | setgid(getgid()); | |
1029 | ||
12a403af | 1030 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) |
1031 | /* Disable ptrace on Linux without sgid bit */ | |
1032 | prctl(PR_SET_DUMPABLE, 0); | |
1033 | #endif | |
1034 | ||
3c0ef626 | 1035 | SSLeay_add_all_algorithms(); |
1036 | ||
7cac2b65 | 1037 | __progname = ssh_get_progname(av[0]); |
3c0ef626 | 1038 | init_rng(); |
1039 | seed_rng(); | |
1040 | ||
bfe49944 | 1041 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { |
3c0ef626 | 1042 | switch (ch) { |
1043 | case 'c': | |
1044 | if (s_flag) | |
1045 | usage(); | |
1046 | c_flag++; | |
1047 | break; | |
1048 | case 'k': | |
1049 | k_flag++; | |
1050 | break; | |
1051 | case 's': | |
1052 | if (c_flag) | |
1053 | usage(); | |
1054 | s_flag++; | |
1055 | break; | |
1056 | case 'd': | |
1057 | if (d_flag) | |
1058 | usage(); | |
1059 | d_flag++; | |
1060 | break; | |
df84fde0 | 1061 | case 'a': |
1062 | agentsocket = optarg; | |
1063 | break; | |
bfe49944 | 1064 | case 't': |
1065 | if ((lifetime = convtime(optarg)) == -1) { | |
1066 | fprintf(stderr, "Invalid lifetime\n"); | |
1067 | usage(); | |
1068 | } | |
1069 | break; | |
3c0ef626 | 1070 | default: |
1071 | usage(); | |
1072 | } | |
1073 | } | |
1074 | ac -= optind; | |
1075 | av += optind; | |
1076 | ||
1077 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) | |
1078 | usage(); | |
1079 | ||
df84fde0 | 1080 | if (ac == 0 && !c_flag && !s_flag) { |
3c0ef626 | 1081 | shell = getenv("SHELL"); |
1082 | if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
1083 | c_flag = 1; | |
1084 | } | |
1085 | if (k_flag) { | |
1086 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); | |
1087 | if (pidstr == NULL) { | |
1088 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
1089 | SSH_AGENTPID_ENV_NAME); | |
1090 | exit(1); | |
1091 | } | |
1092 | pid = atoi(pidstr); | |
1093 | if (pid < 1) { | |
1094 | fprintf(stderr, "%s=\"%s\", which is not a good PID\n", | |
1095 | SSH_AGENTPID_ENV_NAME, pidstr); | |
1096 | exit(1); | |
1097 | } | |
1098 | if (kill(pid, SIGTERM) == -1) { | |
1099 | perror("kill"); | |
1100 | exit(1); | |
1101 | } | |
1102 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1103 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1104 | printf(format, SSH_AGENTPID_ENV_NAME); | |
df84fde0 | 1105 | printf("echo Agent pid %ld killed;\n", (long)pid); |
3c0ef626 | 1106 | exit(0); |
1107 | } | |
1108 | parent_pid = getpid(); | |
1109 | ||
df84fde0 | 1110 | if (agentsocket == NULL) { |
1111 | /* Create private directory for agent socket */ | |
540d72c3 | 1112 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir); |
df84fde0 | 1113 | if (mkdtemp(socket_dir) == NULL) { |
1114 | perror("mkdtemp: private socket dir"); | |
1115 | exit(1); | |
1116 | } | |
1117 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, | |
1118 | (long)parent_pid); | |
1119 | } else { | |
1120 | /* Try to use specified agent socket */ | |
1121 | socket_dir[0] = '\0'; | |
1122 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
3c0ef626 | 1123 | } |
3c0ef626 | 1124 | |
1125 | /* | |
1126 | * Create socket early so it will exist before command gets run from | |
1127 | * the parent. | |
1128 | */ | |
1129 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
1130 | if (sock < 0) { | |
1131 | perror("socket"); | |
1132 | cleanup_exit(1); | |
1133 | } | |
1134 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1135 | sunaddr.sun_family = AF_UNIX; | |
1136 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
1137 | #ifdef HAVE_CYGWIN | |
1138 | prev_mask = umask(0177); | |
1139 | #endif | |
1140 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { | |
1141 | perror("bind"); | |
1142 | #ifdef HAVE_CYGWIN | |
1143 | umask(prev_mask); | |
1144 | #endif | |
1145 | cleanup_exit(1); | |
1146 | } | |
1147 | #ifdef HAVE_CYGWIN | |
1148 | umask(prev_mask); | |
1149 | #endif | |
540d72c3 | 1150 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
3c0ef626 | 1151 | perror("listen"); |
1152 | cleanup_exit(1); | |
1153 | } | |
1154 | ||
1155 | /* | |
1156 | * Fork, and have the parent execute the command, if any, or present | |
1157 | * the socket data. The child continues as the authentication agent. | |
1158 | */ | |
1159 | if (d_flag) { | |
1160 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1161 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1162 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1163 | SSH_AUTHSOCKET_ENV_NAME); | |
df84fde0 | 1164 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
3c0ef626 | 1165 | goto skip; |
1166 | } | |
1167 | pid = fork(); | |
1168 | if (pid == -1) { | |
1169 | perror("fork"); | |
df84fde0 | 1170 | cleanup_exit(1); |
3c0ef626 | 1171 | } |
1172 | if (pid != 0) { /* Parent - execute the given command. */ | |
1173 | close(sock); | |
df84fde0 | 1174 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
3c0ef626 | 1175 | if (ac == 0) { |
1176 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1177 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1178 | SSH_AUTHSOCKET_ENV_NAME); | |
1179 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, | |
1180 | SSH_AGENTPID_ENV_NAME); | |
df84fde0 | 1181 | printf("echo Agent pid %ld;\n", (long)pid); |
3c0ef626 | 1182 | exit(0); |
1183 | } | |
1184 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || | |
1185 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1186 | perror("setenv"); | |
1187 | exit(1); | |
1188 | } | |
1189 | execvp(av[0], av); | |
1190 | perror(av[0]); | |
1191 | exit(1); | |
1192 | } | |
df84fde0 | 1193 | /* child */ |
1194 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
3c0ef626 | 1195 | |
1196 | if (setsid() == -1) { | |
df84fde0 | 1197 | error("setsid: %s", strerror(errno)); |
3c0ef626 | 1198 | cleanup_exit(1); |
1199 | } | |
1200 | ||
1201 | (void)chdir("/"); | |
bfe49944 | 1202 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
1203 | /* XXX might close listen socket */ | |
1204 | (void)dup2(fd, STDIN_FILENO); | |
1205 | (void)dup2(fd, STDOUT_FILENO); | |
1206 | (void)dup2(fd, STDERR_FILENO); | |
1207 | if (fd > 2) | |
1208 | close(fd); | |
1209 | } | |
3c0ef626 | 1210 | |
1211 | #ifdef HAVE_SETRLIMIT | |
1212 | /* deny core dumps, since memory contains unencrypted private keys */ | |
1213 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1214 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
df84fde0 | 1215 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
3c0ef626 | 1216 | cleanup_exit(1); |
1217 | } | |
1218 | #endif | |
1219 | ||
1220 | skip: | |
3c0ef626 | 1221 | new_socket(AUTH_SOCKET, sock); |
1222 | if (ac > 0) { | |
7cac2b65 | 1223 | mysignal(SIGALRM, check_parent_exists); |
3c0ef626 | 1224 | alarm(10); |
1225 | } | |
1226 | idtab_init(); | |
1227 | if (!d_flag) | |
1228 | signal(SIGINT, SIG_IGN); | |
1229 | signal(SIGPIPE, SIG_IGN); | |
1230 | signal(SIGHUP, cleanup_handler); | |
1231 | signal(SIGTERM, cleanup_handler); | |
1232 | nalloc = 0; | |
1233 | ||
1234 | while (1) { | |
1235 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); | |
1236 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { | |
1237 | if (errno == EINTR) | |
1238 | continue; | |
df84fde0 | 1239 | fatal("select: %s", strerror(errno)); |
3c0ef626 | 1240 | } |
1241 | after_select(readsetp, writesetp); | |
1242 | } | |
1243 | /* NOTREACHED */ | |
1244 | } |