]>
Commit | Line | Data |
---|---|---|
8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5260325f | 5 | * The authentication agent program. |
2e73a022 | 6 | * |
bcbf86ec | 7 | * As far as I am concerned, the code I have written for this software |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | * | |
a96070d4 | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 14 | * |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 34 | */ |
8efc0c15 | 35 | |
36 | #include "includes.h" | |
9fd2a215 | 37 | #include "openbsd-compat/sys-queue.h" |
c4087616 | 38 | RCSID("$OpenBSD: ssh-agent.c,v 1.107 2003/01/23 13:50:27 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" |
c4087616 | 53 | #include "readpass.h" |
54 | #include "misc.h" | |
8efc0c15 | 55 | |
2b5fe3b8 | 56 | #ifdef SMARTCARD |
2b5fe3b8 | 57 | #include "scard.h" |
dd2495cb | 58 | #endif |
2b5fe3b8 | 59 | |
17a3011c | 60 | typedef enum { |
61 | AUTH_UNUSED, | |
62 | AUTH_SOCKET, | |
63 | AUTH_CONNECTION | |
64 | } sock_type; | |
65 | ||
5260325f | 66 | typedef struct { |
67 | int fd; | |
17a3011c | 68 | sock_type type; |
5260325f | 69 | Buffer input; |
70 | Buffer output; | |
b9dd5ca1 | 71 | Buffer request; |
8efc0c15 | 72 | } SocketEntry; |
73 | ||
1e3b8b07 | 74 | u_int sockets_alloc = 0; |
8efc0c15 | 75 | SocketEntry *sockets = NULL; |
76 | ||
95f0a918 | 77 | typedef struct identity { |
78 | TAILQ_ENTRY(identity) next; | |
2e73a022 | 79 | Key *key; |
5260325f | 80 | char *comment; |
264572cc | 81 | u_int death; |
c4087616 | 82 | u_int confirm; |
8efc0c15 | 83 | } Identity; |
84 | ||
2e73a022 | 85 | typedef struct { |
86 | int nentries; | |
95f0a918 | 87 | TAILQ_HEAD(idqueue, identity) idlist; |
2e73a022 | 88 | } Idtab; |
89 | ||
90 | /* private key table, one per protocol version */ | |
91 | Idtab idtable[3]; | |
8efc0c15 | 92 | |
93 | int max_fd = 0; | |
94 | ||
95 | /* pid of shell == parent of agent */ | |
9da5c3c9 | 96 | pid_t parent_pid = -1; |
8efc0c15 | 97 | |
98 | /* pathname and directory for AUTH_SOCKET */ | |
99 | char socket_name[1024]; | |
100 | char socket_dir[1024]; | |
101 | ||
3db7f994 | 102 | /* locking */ |
103 | int locked = 0; | |
104 | char *lock_passwd = NULL; | |
105 | ||
5260325f | 106 | #ifdef HAVE___PROGNAME |
107 | extern char *__progname; | |
260d427b | 108 | #else |
109 | char *__progname; | |
110 | #endif | |
5260325f | 111 | |
494b267f | 112 | /* Default lifetime (0 == forever) */ |
113 | static int lifetime = 0; | |
114 | ||
c1a4eef1 | 115 | static void |
116 | close_socket(SocketEntry *e) | |
117 | { | |
c1a4eef1 | 118 | close(e->fd); |
119 | e->fd = -1; | |
120 | e->type = AUTH_UNUSED; | |
121 | buffer_free(&e->input); | |
122 | buffer_free(&e->output); | |
123 | buffer_free(&e->request); | |
124 | } | |
125 | ||
396c147e | 126 | static void |
2e73a022 | 127 | idtab_init(void) |
128 | { | |
129 | int i; | |
e424e241 | 130 | |
6aacefa7 | 131 | for (i = 0; i <=2; i++) { |
95f0a918 | 132 | TAILQ_INIT(&idtable[i].idlist); |
2e73a022 | 133 | idtable[i].nentries = 0; |
134 | } | |
135 | } | |
136 | ||
137 | /* return private key table for requested protocol version */ | |
396c147e | 138 | static Idtab * |
2e73a022 | 139 | idtab_lookup(int version) |
140 | { | |
141 | if (version < 1 || version > 2) | |
142 | fatal("internal error, bad protocol version %d", version); | |
143 | return &idtable[version]; | |
144 | } | |
145 | ||
264572cc | 146 | static void |
147 | free_identity(Identity *id) | |
148 | { | |
149 | key_free(id->key); | |
150 | xfree(id->comment); | |
151 | xfree(id); | |
152 | } | |
153 | ||
2e73a022 | 154 | /* return matching private key for given public key */ |
95f0a918 | 155 | static Identity * |
156 | lookup_identity(Key *key, int version) | |
2e73a022 | 157 | { |
95f0a918 | 158 | Identity *id; |
159 | ||
2e73a022 | 160 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 161 | TAILQ_FOREACH(id, &tab->idlist, next) { |
162 | if (key_equal(key, id->key)) | |
163 | return (id); | |
2e73a022 | 164 | } |
95f0a918 | 165 | return (NULL); |
166 | } | |
167 | ||
c4087616 | 168 | /* Check confirmation of keysign request */ |
169 | static int | |
170 | confirm_key(Identity *id) | |
171 | { | |
172 | char *p, prompt[1024]; | |
173 | int ret = -1; | |
174 | ||
175 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
176 | snprintf(prompt, sizeof(prompt), "Allow use of key %s?\n" | |
177 | "Key fingerprint %s.", id->comment, p); | |
178 | xfree(p); | |
179 | p = read_passphrase(prompt, RP_ALLOW_EOF); | |
180 | if (p != NULL) { | |
181 | /* | |
182 | * Accept empty responses and responses consisting | |
183 | * of the word "yes" as affirmative. | |
184 | */ | |
185 | if (*p == '\0' || *p == '\n' || strcasecmp(p, "yes") == 0) | |
186 | ret = 0; | |
187 | xfree(p); | |
188 | } | |
189 | return (ret); | |
190 | } | |
191 | ||
2e73a022 | 192 | /* send list of supported public keys to 'client' */ |
396c147e | 193 | static void |
2e73a022 | 194 | process_request_identities(SocketEntry *e, int version) |
8efc0c15 | 195 | { |
2e73a022 | 196 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 197 | Identity *id; |
e424e241 | 198 | Buffer msg; |
5260325f | 199 | |
200 | buffer_init(&msg); | |
2e73a022 | 201 | buffer_put_char(&msg, (version == 1) ? |
202 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
203 | buffer_put_int(&msg, tab->nentries); | |
95f0a918 | 204 | TAILQ_FOREACH(id, &tab->idlist, next) { |
fa08c86b | 205 | if (id->key->type == KEY_RSA1) { |
2e73a022 | 206 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
207 | buffer_put_bignum(&msg, id->key->rsa->e); | |
208 | buffer_put_bignum(&msg, id->key->rsa->n); | |
209 | } else { | |
1e3b8b07 | 210 | u_char *blob; |
211 | u_int blen; | |
fa08c86b | 212 | key_to_blob(id->key, &blob, &blen); |
2e73a022 | 213 | buffer_put_string(&msg, blob, blen); |
214 | xfree(blob); | |
215 | } | |
216 | buffer_put_cstring(&msg, id->comment); | |
5260325f | 217 | } |
218 | buffer_put_int(&e->output, buffer_len(&msg)); | |
219 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
220 | buffer_free(&msg); | |
8efc0c15 | 221 | } |
222 | ||
2e73a022 | 223 | /* ssh1 only */ |
396c147e | 224 | static void |
2e73a022 | 225 | process_authentication_challenge1(SocketEntry *e) |
8efc0c15 | 226 | { |
e424e241 | 227 | u_char buf[32], mdbuf[16], session_id[16]; |
228 | u_int response_type; | |
2e73a022 | 229 | BIGNUM *challenge; |
e424e241 | 230 | Identity *id; |
2e73a022 | 231 | int i, len; |
5260325f | 232 | Buffer msg; |
233 | MD5_CTX md; | |
e424e241 | 234 | Key *key; |
5260325f | 235 | |
236 | buffer_init(&msg); | |
fa08c86b | 237 | key = key_new(KEY_RSA1); |
b775c6f2 | 238 | if ((challenge = BN_new()) == NULL) |
239 | fatal("process_authentication_challenge1: BN_new failed"); | |
5260325f | 240 | |
1169c3df | 241 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 242 | buffer_get_bignum(&e->request, key->rsa->e); |
243 | buffer_get_bignum(&e->request, key->rsa->n); | |
244 | buffer_get_bignum(&e->request, challenge); | |
5260325f | 245 | |
2e73a022 | 246 | /* Only protocol 1.1 is supported */ |
b9dd5ca1 | 247 | if (buffer_len(&e->request) == 0) |
2e73a022 | 248 | goto failure; |
b9dd5ca1 | 249 | buffer_get(&e->request, session_id, 16); |
250 | response_type = buffer_get_int(&e->request); | |
2e73a022 | 251 | if (response_type != 1) |
252 | goto failure; | |
253 | ||
95f0a918 | 254 | id = lookup_identity(key, 1); |
c4087616 | 255 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { |
95f0a918 | 256 | Key *private = id->key; |
2e73a022 | 257 | /* Decrypt the challenge using the private key. */ |
46aa2d1f | 258 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
259 | goto failure; | |
2e73a022 | 260 | |
261 | /* The response is MD5 of decrypted challenge plus session id. */ | |
262 | len = BN_num_bytes(challenge); | |
263 | if (len <= 0 || len > 32) { | |
264 | log("process_authentication_challenge: bad challenge length %d", len); | |
265 | goto failure; | |
5260325f | 266 | } |
2e73a022 | 267 | memset(buf, 0, 32); |
268 | BN_bn2bin(challenge, buf + 32 - len); | |
269 | MD5_Init(&md); | |
270 | MD5_Update(&md, buf, 32); | |
271 | MD5_Update(&md, session_id, 16); | |
272 | MD5_Final(mdbuf, &md); | |
273 | ||
274 | /* Send the response. */ | |
275 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
276 | for (i = 0; i < 16; i++) | |
277 | buffer_put_char(&msg, mdbuf[i]); | |
278 | goto send; | |
279 | } | |
280 | ||
281 | failure: | |
282 | /* Unknown identity or protocol error. Send failure. */ | |
5260325f | 283 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
284 | send: | |
2e73a022 | 285 | buffer_put_int(&e->output, buffer_len(&msg)); |
286 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
287 | key_free(key); | |
288 | BN_clear_free(challenge); | |
289 | buffer_free(&msg); | |
290 | } | |
291 | ||
292 | /* ssh2 only */ | |
396c147e | 293 | static void |
2e73a022 | 294 | process_sign_request2(SocketEntry *e) |
295 | { | |
1e3b8b07 | 296 | u_char *blob, *data, *signature = NULL; |
297 | u_int blen, dlen, slen = 0; | |
e424e241 | 298 | extern int datafellows; |
299 | int ok = -1, flags; | |
2e73a022 | 300 | Buffer msg; |
e424e241 | 301 | Key *key; |
2e73a022 | 302 | |
303 | datafellows = 0; | |
227e8e86 | 304 | |
b9dd5ca1 | 305 | blob = buffer_get_string(&e->request, &blen); |
306 | data = buffer_get_string(&e->request, &dlen); | |
188adeb2 | 307 | |
b9dd5ca1 | 308 | flags = buffer_get_int(&e->request); |
188adeb2 | 309 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
310 | datafellows = SSH_BUG_SIGBLOB; | |
2e73a022 | 311 | |
fa08c86b | 312 | key = key_from_blob(blob, blen); |
2e73a022 | 313 | if (key != NULL) { |
95f0a918 | 314 | Identity *id = lookup_identity(key, 2); |
c4087616 | 315 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) |
95f0a918 | 316 | ok = key_sign(id->key, &signature, &slen, data, dlen); |
2e73a022 | 317 | } |
318 | key_free(key); | |
319 | buffer_init(&msg); | |
320 | if (ok == 0) { | |
321 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
322 | buffer_put_string(&msg, signature, slen); | |
323 | } else { | |
324 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
325 | } | |
5260325f | 326 | buffer_put_int(&e->output, buffer_len(&msg)); |
327 | buffer_append(&e->output, buffer_ptr(&msg), | |
2e73a022 | 328 | buffer_len(&msg)); |
5260325f | 329 | buffer_free(&msg); |
2e73a022 | 330 | xfree(data); |
331 | xfree(blob); | |
332 | if (signature != NULL) | |
333 | xfree(signature); | |
8efc0c15 | 334 | } |
335 | ||
2e73a022 | 336 | /* shared */ |
396c147e | 337 | static void |
2e73a022 | 338 | process_remove_identity(SocketEntry *e, int version) |
8efc0c15 | 339 | { |
e424e241 | 340 | u_int blen, bits; |
341 | int success = 0; | |
95f0a918 | 342 | Key *key = NULL; |
1e3b8b07 | 343 | u_char *blob; |
2e73a022 | 344 | |
6aacefa7 | 345 | switch (version) { |
2e73a022 | 346 | case 1: |
fa08c86b | 347 | key = key_new(KEY_RSA1); |
b9dd5ca1 | 348 | bits = buffer_get_int(&e->request); |
349 | buffer_get_bignum(&e->request, key->rsa->e); | |
350 | buffer_get_bignum(&e->request, key->rsa->n); | |
2e73a022 | 351 | |
352 | if (bits != key_size(key)) | |
e424e241 | 353 | log("Warning: identity keysize mismatch: actual %u, announced %u", |
42f11eb2 | 354 | key_size(key), bits); |
2e73a022 | 355 | break; |
356 | case 2: | |
b9dd5ca1 | 357 | blob = buffer_get_string(&e->request, &blen); |
fa08c86b | 358 | key = key_from_blob(blob, blen); |
2e73a022 | 359 | xfree(blob); |
360 | break; | |
361 | } | |
362 | if (key != NULL) { | |
95f0a918 | 363 | Identity *id = lookup_identity(key, version); |
364 | if (id != NULL) { | |
aa3378df | 365 | /* |
366 | * We have this key. Free the old key. Since we | |
367 | * don\'t want to leave empty slots in the middle of | |
d343d900 | 368 | * the array, we actually free the key there and move |
369 | * all the entries between the empty slot and the end | |
370 | * of the array. | |
aa3378df | 371 | */ |
2e73a022 | 372 | Idtab *tab = idtab_lookup(version); |
fa08c86b | 373 | if (tab->nentries < 1) |
374 | fatal("process_remove_identity: " | |
375 | "internal error: tab->nentries %d", | |
376 | tab->nentries); | |
95f0a918 | 377 | TAILQ_REMOVE(&tab->idlist, id, next); |
378 | free_identity(id); | |
2e73a022 | 379 | tab->nentries--; |
380 | success = 1; | |
5260325f | 381 | } |
2e73a022 | 382 | key_free(key); |
383 | } | |
8efc0c15 | 384 | buffer_put_int(&e->output, 1); |
2e73a022 | 385 | buffer_put_char(&e->output, |
386 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 387 | } |
388 | ||
396c147e | 389 | static void |
2e73a022 | 390 | process_remove_all_identities(SocketEntry *e, int version) |
8efc0c15 | 391 | { |
2e73a022 | 392 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 393 | Identity *id; |
8efc0c15 | 394 | |
5260325f | 395 | /* Loop over all identities and clear the keys. */ |
95f0a918 | 396 | for (id = TAILQ_FIRST(&tab->idlist); id; |
397 | id = TAILQ_FIRST(&tab->idlist)) { | |
398 | TAILQ_REMOVE(&tab->idlist, id, next); | |
399 | free_identity(id); | |
5260325f | 400 | } |
8efc0c15 | 401 | |
5260325f | 402 | /* Mark that there are no identities. */ |
2e73a022 | 403 | tab->nentries = 0; |
8efc0c15 | 404 | |
405 | /* Send success. */ | |
406 | buffer_put_int(&e->output, 1); | |
407 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
5260325f | 408 | } |
409 | ||
264572cc | 410 | static void |
411 | reaper(void) | |
412 | { | |
e424e241 | 413 | u_int now = time(NULL); |
264572cc | 414 | Identity *id, *nxt; |
415 | int version; | |
e424e241 | 416 | Idtab *tab; |
264572cc | 417 | |
418 | for (version = 1; version < 3; version++) { | |
419 | tab = idtab_lookup(version); | |
420 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
421 | nxt = TAILQ_NEXT(id, next); | |
422 | if (id->death != 0 && now >= id->death) { | |
423 | TAILQ_REMOVE(&tab->idlist, id, next); | |
424 | free_identity(id); | |
425 | tab->nentries--; | |
426 | } | |
427 | } | |
428 | } | |
429 | } | |
430 | ||
396c147e | 431 | static void |
fa08c86b | 432 | process_add_identity(SocketEntry *e, int version) |
433 | { | |
2e73a022 | 434 | Idtab *tab = idtab_lookup(version); |
c4087616 | 435 | int type, success = 0, death = 0, confirm = 0; |
e424e241 | 436 | char *type_name, *comment; |
437 | Key *k = NULL; | |
5260325f | 438 | |
2e73a022 | 439 | switch (version) { |
440 | case 1: | |
fa08c86b | 441 | k = key_new_private(KEY_RSA1); |
1169c3df | 442 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 443 | buffer_get_bignum(&e->request, k->rsa->n); |
444 | buffer_get_bignum(&e->request, k->rsa->e); | |
445 | buffer_get_bignum(&e->request, k->rsa->d); | |
446 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
2e73a022 | 447 | |
448 | /* SSH and SSL have p and q swapped */ | |
b9dd5ca1 | 449 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
450 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
2e73a022 | 451 | |
452 | /* Generate additional parameters */ | |
2b63e803 | 453 | rsa_generate_additional_parameters(k->rsa); |
2e73a022 | 454 | break; |
455 | case 2: | |
b9dd5ca1 | 456 | type_name = buffer_get_string(&e->request, NULL); |
42f11eb2 | 457 | type = key_type_from_name(type_name); |
fa08c86b | 458 | xfree(type_name); |
6aacefa7 | 459 | switch (type) { |
fa08c86b | 460 | case KEY_DSA: |
461 | k = key_new_private(type); | |
b9dd5ca1 | 462 | buffer_get_bignum2(&e->request, k->dsa->p); |
463 | buffer_get_bignum2(&e->request, k->dsa->q); | |
464 | buffer_get_bignum2(&e->request, k->dsa->g); | |
465 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
466 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
fa08c86b | 467 | break; |
468 | case KEY_RSA: | |
469 | k = key_new_private(type); | |
b9dd5ca1 | 470 | buffer_get_bignum2(&e->request, k->rsa->n); |
471 | buffer_get_bignum2(&e->request, k->rsa->e); | |
472 | buffer_get_bignum2(&e->request, k->rsa->d); | |
473 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
474 | buffer_get_bignum2(&e->request, k->rsa->p); | |
475 | buffer_get_bignum2(&e->request, k->rsa->q); | |
fa08c86b | 476 | |
477 | /* Generate additional parameters */ | |
2b63e803 | 478 | rsa_generate_additional_parameters(k->rsa); |
fa08c86b | 479 | break; |
480 | default: | |
b9dd5ca1 | 481 | buffer_clear(&e->request); |
2e73a022 | 482 | goto send; |
5260325f | 483 | } |
2e73a022 | 484 | break; |
485 | } | |
b9dd5ca1 | 486 | comment = buffer_get_string(&e->request, NULL); |
2e73a022 | 487 | if (k == NULL) { |
488 | xfree(comment); | |
489 | goto send; | |
490 | } | |
491 | success = 1; | |
ee900f87 | 492 | while (buffer_len(&e->request)) { |
493 | switch (buffer_get_char(&e->request)) { | |
494 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
495 | death = time(NULL) + buffer_get_int(&e->request); | |
496 | break; | |
c4087616 | 497 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
498 | confirm = 1; | |
499 | break; | |
ee900f87 | 500 | default: |
501 | break; | |
502 | } | |
503 | } | |
494b267f | 504 | if (lifetime && !death) |
505 | death = time(NULL) + lifetime; | |
95f0a918 | 506 | if (lookup_identity(k, version) == NULL) { |
507 | Identity *id = xmalloc(sizeof(Identity)); | |
508 | id->key = k; | |
509 | id->comment = comment; | |
ee900f87 | 510 | id->death = death; |
c4087616 | 511 | id->confirm = confirm; |
95f0a918 | 512 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
2e73a022 | 513 | /* Increment the number of identities. */ |
514 | tab->nentries++; | |
515 | } else { | |
516 | key_free(k); | |
517 | xfree(comment); | |
518 | } | |
519 | send: | |
5260325f | 520 | buffer_put_int(&e->output, 1); |
2e73a022 | 521 | buffer_put_char(&e->output, |
522 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 523 | } |
524 | ||
3db7f994 | 525 | /* XXX todo: encrypt sensitive data with passphrase */ |
526 | static void | |
527 | process_lock_agent(SocketEntry *e, int lock) | |
528 | { | |
3db7f994 | 529 | int success = 0; |
e424e241 | 530 | char *passwd; |
3db7f994 | 531 | |
532 | passwd = buffer_get_string(&e->request, NULL); | |
533 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
534 | locked = 0; | |
535 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
536 | xfree(lock_passwd); | |
537 | lock_passwd = NULL; | |
538 | success = 1; | |
539 | } else if (!locked && lock) { | |
540 | locked = 1; | |
541 | lock_passwd = xstrdup(passwd); | |
542 | success = 1; | |
543 | } | |
544 | memset(passwd, 0, strlen(passwd)); | |
545 | xfree(passwd); | |
7203d6bb | 546 | |
3db7f994 | 547 | buffer_put_int(&e->output, 1); |
548 | buffer_put_char(&e->output, | |
549 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
3db7f994 | 550 | } |
551 | ||
552 | static void | |
553 | no_identities(SocketEntry *e, u_int type) | |
554 | { | |
555 | Buffer msg; | |
556 | ||
557 | buffer_init(&msg); | |
558 | buffer_put_char(&msg, | |
559 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
560 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
561 | buffer_put_int(&msg, 0); | |
562 | buffer_put_int(&e->output, buffer_len(&msg)); | |
563 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
564 | buffer_free(&msg); | |
565 | } | |
2b5fe3b8 | 566 | |
567 | #ifdef SMARTCARD | |
568 | static void | |
569 | process_add_smartcard_key (SocketEntry *e) | |
570 | { | |
76139bd8 | 571 | char *sc_reader_id = NULL, *pin; |
0659cace | 572 | int i, version, success = 0; |
e424e241 | 573 | Key **keys, *k; |
574 | Identity *id; | |
575 | Idtab *tab; | |
184eed6a | 576 | |
b9dd5ca1 | 577 | sc_reader_id = buffer_get_string(&e->request, NULL); |
578 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 579 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 580 | xfree(sc_reader_id); |
76139bd8 | 581 | xfree(pin); |
2b5fe3b8 | 582 | |
0659cace | 583 | if (keys == NULL || keys[0] == NULL) { |
584 | error("sc_get_keys failed"); | |
2b5fe3b8 | 585 | goto send; |
586 | } | |
0659cace | 587 | for (i = 0; keys[i] != NULL; i++) { |
588 | k = keys[i]; | |
589 | version = k->type == KEY_RSA1 ? 1 : 2; | |
590 | tab = idtab_lookup(version); | |
591 | if (lookup_identity(k, version) == NULL) { | |
592 | id = xmalloc(sizeof(Identity)); | |
593 | id->key = k; | |
594 | id->comment = xstrdup("smartcard key"); | |
264572cc | 595 | id->death = 0; |
c4087616 | 596 | id->confirm = 0; |
0659cace | 597 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
598 | tab->nentries++; | |
599 | success = 1; | |
600 | } else { | |
601 | key_free(k); | |
602 | } | |
603 | keys[i] = NULL; | |
2b5fe3b8 | 604 | } |
0659cace | 605 | xfree(keys); |
2b5fe3b8 | 606 | send: |
607 | buffer_put_int(&e->output, 1); | |
608 | buffer_put_char(&e->output, | |
609 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
610 | } | |
611 | ||
612 | static void | |
613 | process_remove_smartcard_key(SocketEntry *e) | |
614 | { | |
76139bd8 | 615 | char *sc_reader_id = NULL, *pin; |
0659cace | 616 | int i, version, success = 0; |
e424e241 | 617 | Key **keys, *k = NULL; |
618 | Identity *id; | |
619 | Idtab *tab; | |
2b5fe3b8 | 620 | |
b9dd5ca1 | 621 | sc_reader_id = buffer_get_string(&e->request, NULL); |
622 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 623 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 624 | xfree(sc_reader_id); |
76139bd8 | 625 | xfree(pin); |
2b5fe3b8 | 626 | |
0659cace | 627 | if (keys == NULL || keys[0] == NULL) { |
628 | error("sc_get_keys failed"); | |
629 | goto send; | |
630 | } | |
631 | for (i = 0; keys[i] != NULL; i++) { | |
632 | k = keys[i]; | |
633 | version = k->type == KEY_RSA1 ? 1 : 2; | |
634 | if ((id = lookup_identity(k, version)) != NULL) { | |
635 | tab = idtab_lookup(version); | |
875ec275 | 636 | TAILQ_REMOVE(&tab->idlist, id, next); |
2b5fe3b8 | 637 | tab->nentries--; |
95f0a918 | 638 | free_identity(id); |
2b5fe3b8 | 639 | success = 1; |
640 | } | |
641 | key_free(k); | |
0659cace | 642 | keys[i] = NULL; |
2b5fe3b8 | 643 | } |
0659cace | 644 | xfree(keys); |
645 | send: | |
2b5fe3b8 | 646 | buffer_put_int(&e->output, 1); |
647 | buffer_put_char(&e->output, | |
648 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
649 | } | |
3e984472 | 650 | #endif /* SMARTCARD */ |
2b5fe3b8 | 651 | |
2e73a022 | 652 | /* dispatch incoming messages */ |
653 | ||
396c147e | 654 | static void |
8efc0c15 | 655 | process_message(SocketEntry *e) |
656 | { | |
e424e241 | 657 | u_int msg_len, type; |
1e3b8b07 | 658 | u_char *cp; |
264572cc | 659 | |
660 | /* kill dead keys */ | |
661 | reaper(); | |
662 | ||
5260325f | 663 | if (buffer_len(&e->input) < 5) |
664 | return; /* Incomplete message. */ | |
20905a8e | 665 | cp = buffer_ptr(&e->input); |
5260325f | 666 | msg_len = GET_32BIT(cp); |
667 | if (msg_len > 256 * 1024) { | |
c1a4eef1 | 668 | close_socket(e); |
5260325f | 669 | return; |
670 | } | |
671 | if (buffer_len(&e->input) < msg_len + 4) | |
672 | return; | |
b9dd5ca1 | 673 | |
674 | /* move the current input to e->request */ | |
5260325f | 675 | buffer_consume(&e->input, 4); |
b9dd5ca1 | 676 | buffer_clear(&e->request); |
677 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
678 | buffer_consume(&e->input, msg_len); | |
679 | type = buffer_get_char(&e->request); | |
5260325f | 680 | |
3db7f994 | 681 | /* check wheter agent is locked */ |
682 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
683 | buffer_clear(&e->request); | |
684 | switch (type) { | |
685 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
686 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
687 | /* send empty lists */ | |
688 | no_identities(e, type); | |
689 | break; | |
690 | default: | |
691 | /* send a fail message for all other request types */ | |
692 | buffer_put_int(&e->output, 1); | |
693 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
694 | } | |
695 | return; | |
696 | } | |
697 | ||
2b5fe3b8 | 698 | debug("type %d", type); |
5260325f | 699 | switch (type) { |
3db7f994 | 700 | case SSH_AGENTC_LOCK: |
701 | case SSH_AGENTC_UNLOCK: | |
702 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
703 | break; | |
2e73a022 | 704 | /* ssh1 */ |
5260325f | 705 | case SSH_AGENTC_RSA_CHALLENGE: |
2e73a022 | 706 | process_authentication_challenge1(e); |
707 | break; | |
708 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
709 | process_request_identities(e, 1); | |
5260325f | 710 | break; |
711 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
ee900f87 | 712 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
2e73a022 | 713 | process_add_identity(e, 1); |
5260325f | 714 | break; |
715 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
2e73a022 | 716 | process_remove_identity(e, 1); |
5260325f | 717 | break; |
718 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
2e73a022 | 719 | process_remove_all_identities(e, 1); |
720 | break; | |
721 | /* ssh2 */ | |
722 | case SSH2_AGENTC_SIGN_REQUEST: | |
723 | process_sign_request2(e); | |
724 | break; | |
725 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
726 | process_request_identities(e, 2); | |
727 | break; | |
728 | case SSH2_AGENTC_ADD_IDENTITY: | |
ee900f87 | 729 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
2e73a022 | 730 | process_add_identity(e, 2); |
731 | break; | |
732 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
733 | process_remove_identity(e, 2); | |
734 | break; | |
735 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
736 | process_remove_all_identities(e, 2); | |
5260325f | 737 | break; |
2b5fe3b8 | 738 | #ifdef SMARTCARD |
739 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
740 | process_add_smartcard_key(e); | |
184eed6a | 741 | break; |
2b5fe3b8 | 742 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
743 | process_remove_smartcard_key(e); | |
184eed6a | 744 | break; |
3e984472 | 745 | #endif /* SMARTCARD */ |
5260325f | 746 | default: |
747 | /* Unknown message. Respond with failure. */ | |
748 | error("Unknown message %d", type); | |
b9dd5ca1 | 749 | buffer_clear(&e->request); |
5260325f | 750 | buffer_put_int(&e->output, 1); |
751 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
752 | break; | |
753 | } | |
8efc0c15 | 754 | } |
755 | ||
396c147e | 756 | static void |
17a3011c | 757 | new_socket(sock_type type, int fd) |
8efc0c15 | 758 | { |
1e3b8b07 | 759 | u_int i, old_alloc; |
e424e241 | 760 | |
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 | { |
e424e241 | 845 | struct sockaddr_un sunaddr; |
610cd5c6 | 846 | socklen_t slen; |
5260325f | 847 | char buf[1024]; |
e424e241 | 848 | int len, sock; |
849 | u_int i; | |
87f4111f | 850 | uid_t euid; |
851 | gid_t egid; | |
5260325f | 852 | |
853 | for (i = 0; i < sockets_alloc; i++) | |
854 | switch (sockets[i].type) { | |
855 | case AUTH_UNUSED: | |
856 | break; | |
857 | case AUTH_SOCKET: | |
858 | if (FD_ISSET(sockets[i].fd, readset)) { | |
610cd5c6 | 859 | slen = sizeof(sunaddr); |
42f11eb2 | 860 | sock = accept(sockets[i].fd, |
861 | (struct sockaddr *) &sunaddr, &slen); | |
5260325f | 862 | if (sock < 0) { |
fccfbe3b | 863 | error("accept from AUTH_SOCKET: %s", |
864 | strerror(errno)); | |
5260325f | 865 | break; |
866 | } | |
87f4111f | 867 | if (getpeereid(sock, &euid, &egid) < 0) { |
868 | error("getpeereid %d failed: %s", | |
869 | sock, strerror(errno)); | |
870 | close(sock); | |
871 | break; | |
872 | } | |
e139021d | 873 | if ((euid != 0) && (getuid() != euid)) { |
87f4111f | 874 | error("uid mismatch: " |
792e7d2d | 875 | "peer euid %u != uid %u", |
876 | (u_int) euid, (u_int) getuid()); | |
87f4111f | 877 | close(sock); |
878 | break; | |
879 | } | |
5260325f | 880 | new_socket(AUTH_CONNECTION, sock); |
881 | } | |
882 | break; | |
883 | case AUTH_CONNECTION: | |
884 | if (buffer_len(&sockets[i].output) > 0 && | |
885 | FD_ISSET(sockets[i].fd, writeset)) { | |
bbc62e59 | 886 | do { |
887 | len = write(sockets[i].fd, | |
888 | buffer_ptr(&sockets[i].output), | |
889 | buffer_len(&sockets[i].output)); | |
890 | if (len == -1 && (errno == EAGAIN || | |
891 | errno == EINTR)) | |
892 | continue; | |
893 | break; | |
894 | } while (1); | |
5260325f | 895 | if (len <= 0) { |
c1a4eef1 | 896 | close_socket(&sockets[i]); |
5260325f | 897 | break; |
898 | } | |
899 | buffer_consume(&sockets[i].output, len); | |
900 | } | |
901 | if (FD_ISSET(sockets[i].fd, readset)) { | |
bbc62e59 | 902 | do { |
903 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
904 | if (len == -1 && (errno == EAGAIN || | |
905 | errno == EINTR)) | |
906 | continue; | |
907 | break; | |
908 | } while (1); | |
5260325f | 909 | if (len <= 0) { |
c1a4eef1 | 910 | close_socket(&sockets[i]); |
5260325f | 911 | break; |
912 | } | |
913 | buffer_append(&sockets[i].input, buf, len); | |
914 | process_message(&sockets[i]); | |
915 | } | |
916 | break; | |
917 | default: | |
918 | fatal("Unknown type %d", sockets[i].type); | |
919 | } | |
8efc0c15 | 920 | } |
921 | ||
396c147e | 922 | static void |
fccfbe3b | 923 | cleanup_socket(void *p) |
dae3fa13 | 924 | { |
2f4b2e38 | 925 | if (socket_name[0]) |
926 | unlink(socket_name); | |
927 | if (socket_dir[0]) | |
928 | rmdir(socket_dir); | |
8efc0c15 | 929 | } |
930 | ||
396c147e | 931 | static void |
dae3fa13 | 932 | cleanup_exit(int i) |
933 | { | |
fccfbe3b | 934 | cleanup_socket(NULL); |
5260325f | 935 | exit(i); |
dae3fa13 | 936 | } |
937 | ||
396c147e | 938 | static void |
2f4b2e38 | 939 | cleanup_handler(int sig) |
940 | { | |
fccfbe3b | 941 | cleanup_socket(NULL); |
2f4b2e38 | 942 | _exit(2); |
943 | } | |
944 | ||
7efa8482 | 945 | static void |
946 | check_parent_exists(int sig) | |
947 | { | |
948 | int save_errno = errno; | |
949 | ||
950 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
951 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
952 | cleanup_handler(sig); /* safe */ | |
953 | } | |
954 | signal(SIGALRM, check_parent_exists); | |
955 | alarm(10); | |
956 | errno = save_errno; | |
957 | } | |
958 | ||
396c147e | 959 | static void |
cc8aca8a | 960 | usage(void) |
dae3fa13 | 961 | { |
33e766d2 | 962 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", |
0e3c1f95 | 963 | __progname); |
33e766d2 | 964 | fprintf(stderr, "Options:\n"); |
965 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
966 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
967 | fprintf(stderr, " -k Kill the current agent.\n"); | |
968 | fprintf(stderr, " -d Debug mode.\n"); | |
3e7efb37 | 969 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
494b267f | 970 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); |
5260325f | 971 | exit(1); |
dae3fa13 | 972 | } |
973 | ||
8efc0c15 | 974 | int |
975 | main(int ac, char **av) | |
976 | { | |
c4087616 | 977 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; |
978 | int sock, fd, ch, nalloc; | |
e424e241 | 979 | char *shell, *format, *pidstr, *agentsocket = NULL; |
980 | fd_set *readsetp = NULL, *writesetp = NULL; | |
5260325f | 981 | struct sockaddr_un sunaddr; |
b03bd394 | 982 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 983 | struct rlimit rlim; |
c7ccfd39 | 984 | #endif |
985 | #ifdef HAVE_CYGWIN | |
986 | int prev_mask; | |
b03bd394 | 987 | #endif |
c04f75f1 | 988 | extern int optind; |
ef3912be | 989 | extern char *optarg; |
e424e241 | 990 | pid_t pid; |
991 | char pidstrbuf[1 + 3 * sizeof pid]; | |
fcb975eb | 992 | |
954640a4 | 993 | /* drop */ |
994 | setegid(getgid()); | |
995 | setgid(getgid()); | |
996 | ||
457fc0c6 | 997 | SSLeay_add_all_algorithms(); |
998 | ||
260d427b | 999 | __progname = get_progname(av[0]); |
264dce47 | 1000 | init_rng(); |
e339aa53 | 1001 | seed_rng(); |
2b87da3b | 1002 | |
494b267f | 1003 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { |
5260325f | 1004 | switch (ch) { |
1005 | case 'c': | |
1006 | if (s_flag) | |
1007 | usage(); | |
1008 | c_flag++; | |
1009 | break; | |
1010 | case 'k': | |
1011 | k_flag++; | |
1012 | break; | |
1013 | case 's': | |
1014 | if (c_flag) | |
1015 | usage(); | |
1016 | s_flag++; | |
1017 | break; | |
ffdb5d70 | 1018 | case 'd': |
1019 | if (d_flag) | |
1020 | usage(); | |
1021 | d_flag++; | |
1022 | break; | |
3e7efb37 | 1023 | case 'a': |
1024 | agentsocket = optarg; | |
1025 | break; | |
494b267f | 1026 | case 't': |
1027 | if ((lifetime = convtime(optarg)) == -1) { | |
1028 | fprintf(stderr, "Invalid lifetime\n"); | |
1029 | usage(); | |
1030 | } | |
1031 | break; | |
5260325f | 1032 | default: |
1033 | usage(); | |
1034 | } | |
dae3fa13 | 1035 | } |
5260325f | 1036 | ac -= optind; |
1037 | av += optind; | |
1038 | ||
ffdb5d70 | 1039 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
5260325f | 1040 | usage(); |
1041 | ||
b745a2f2 | 1042 | if (ac == 0 && !c_flag && !s_flag) { |
5260325f | 1043 | shell = getenv("SHELL"); |
1044 | if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
1045 | c_flag = 1; | |
dae3fa13 | 1046 | } |
5260325f | 1047 | if (k_flag) { |
1048 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); | |
1049 | if (pidstr == NULL) { | |
1050 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
42f11eb2 | 1051 | SSH_AGENTPID_ENV_NAME); |
5260325f | 1052 | exit(1); |
1053 | } | |
1054 | pid = atoi(pidstr); | |
42f11eb2 | 1055 | if (pid < 1) { |
5260325f | 1056 | fprintf(stderr, "%s=\"%s\", which is not a good PID\n", |
42f11eb2 | 1057 | SSH_AGENTPID_ENV_NAME, pidstr); |
5260325f | 1058 | exit(1); |
1059 | } | |
1060 | if (kill(pid, SIGTERM) == -1) { | |
1061 | perror("kill"); | |
1062 | exit(1); | |
1063 | } | |
1064 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1065 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1066 | printf(format, SSH_AGENTPID_ENV_NAME); | |
c457707e | 1067 | printf("echo Agent pid %ld killed;\n", (long)pid); |
5260325f | 1068 | exit(0); |
dae3fa13 | 1069 | } |
5260325f | 1070 | parent_pid = getpid(); |
1071 | ||
3e7efb37 | 1072 | if (agentsocket == NULL) { |
1073 | /* Create private directory for agent socket */ | |
1074 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir); | |
1075 | if (mkdtemp(socket_dir) == NULL) { | |
1076 | perror("mkdtemp: private socket dir"); | |
1077 | exit(1); | |
1078 | } | |
c457707e | 1079 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
1080 | (long)parent_pid); | |
3e7efb37 | 1081 | } else { |
1082 | /* Try to use specified agent socket */ | |
1083 | socket_dir[0] = '\0'; | |
1084 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
5260325f | 1085 | } |
5260325f | 1086 | |
aa3378df | 1087 | /* |
1088 | * Create socket early so it will exist before command gets run from | |
1089 | * the parent. | |
1090 | */ | |
5260325f | 1091 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
1092 | if (sock < 0) { | |
1093 | perror("socket"); | |
1094 | cleanup_exit(1); | |
1095 | } | |
1096 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1097 | sunaddr.sun_family = AF_UNIX; | |
1098 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
c7ccfd39 | 1099 | #ifdef HAVE_CYGWIN |
1100 | prev_mask = umask(0177); | |
1101 | #endif | |
5260325f | 1102 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { |
1103 | perror("bind"); | |
c7ccfd39 | 1104 | #ifdef HAVE_CYGWIN |
1105 | umask(prev_mask); | |
1106 | #endif | |
5260325f | 1107 | cleanup_exit(1); |
1108 | } | |
c7ccfd39 | 1109 | #ifdef HAVE_CYGWIN |
1110 | umask(prev_mask); | |
1111 | #endif | |
00e41835 | 1112 | if (listen(sock, 128) < 0) { |
5260325f | 1113 | perror("listen"); |
1114 | cleanup_exit(1); | |
dae3fa13 | 1115 | } |
42f11eb2 | 1116 | |
aa3378df | 1117 | /* |
1118 | * Fork, and have the parent execute the command, if any, or present | |
1119 | * the socket data. The child continues as the authentication agent. | |
1120 | */ | |
ffdb5d70 | 1121 | if (d_flag) { |
1122 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1123 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1124 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1125 | SSH_AUTHSOCKET_ENV_NAME); | |
c457707e | 1126 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
ffdb5d70 | 1127 | goto skip; |
1128 | } | |
5260325f | 1129 | pid = fork(); |
1130 | if (pid == -1) { | |
1131 | perror("fork"); | |
fccfbe3b | 1132 | cleanup_exit(1); |
dae3fa13 | 1133 | } |
5260325f | 1134 | if (pid != 0) { /* Parent - execute the given command. */ |
1135 | close(sock); | |
c457707e | 1136 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
5260325f | 1137 | if (ac == 0) { |
1138 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1139 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
42f11eb2 | 1140 | SSH_AUTHSOCKET_ENV_NAME); |
5260325f | 1141 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
42f11eb2 | 1142 | SSH_AGENTPID_ENV_NAME); |
c457707e | 1143 | printf("echo Agent pid %ld;\n", (long)pid); |
5260325f | 1144 | exit(0); |
1145 | } | |
bcbf86ec | 1146 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
1147 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1148 | perror("setenv"); | |
1149 | exit(1); | |
1150 | } | |
5260325f | 1151 | execvp(av[0], av); |
1152 | perror(av[0]); | |
1153 | exit(1); | |
1154 | } | |
fccfbe3b | 1155 | /* child */ |
1156 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
ec9f3450 | 1157 | |
1158 | if (setsid() == -1) { | |
fccfbe3b | 1159 | error("setsid: %s", strerror(errno)); |
ec9f3450 | 1160 | cleanup_exit(1); |
1161 | } | |
1162 | ||
1163 | (void)chdir("/"); | |
c4087616 | 1164 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
1165 | /* XXX might close listen socket */ | |
1166 | (void)dup2(fd, STDIN_FILENO); | |
1167 | (void)dup2(fd, STDOUT_FILENO); | |
1168 | (void)dup2(fd, STDERR_FILENO); | |
1169 | if (fd > 2) | |
1170 | close(fd); | |
1171 | } | |
dae3fa13 | 1172 | |
b03bd394 | 1173 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1174 | /* deny core dumps, since memory contains unencrypted private keys */ |
1175 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1176 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
fccfbe3b | 1177 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
0b6fbf03 | 1178 | cleanup_exit(1); |
1179 | } | |
b03bd394 | 1180 | #endif |
ffdb5d70 | 1181 | |
1182 | skip: | |
fccfbe3b | 1183 | fatal_add_cleanup(cleanup_socket, NULL); |
5260325f | 1184 | new_socket(AUTH_SOCKET, sock); |
1185 | if (ac > 0) { | |
1186 | signal(SIGALRM, check_parent_exists); | |
1187 | alarm(10); | |
1188 | } | |
2e73a022 | 1189 | idtab_init(); |
1ee482c5 | 1190 | if (!d_flag) |
ffdb5d70 | 1191 | signal(SIGINT, SIG_IGN); |
1ee482c5 | 1192 | signal(SIGPIPE, SIG_IGN); |
2f4b2e38 | 1193 | signal(SIGHUP, cleanup_handler); |
1194 | signal(SIGTERM, cleanup_handler); | |
e364646f | 1195 | nalloc = 0; |
1196 | ||
5260325f | 1197 | while (1) { |
e364646f | 1198 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); |
42f11eb2 | 1199 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { |
5260325f | 1200 | if (errno == EINTR) |
1201 | continue; | |
fccfbe3b | 1202 | fatal("select: %s", strerror(errno)); |
5260325f | 1203 | } |
42f11eb2 | 1204 | after_select(readsetp, writesetp); |
8efc0c15 | 1205 | } |
5260325f | 1206 | /* NOTREACHED */ |
8efc0c15 | 1207 | } |