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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5260325f | 5 | * The authentication agent program. |
2e73a022 | 6 | * |
bcbf86ec | 7 | * As far as I am concerned, the code I have written for this software |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | * | |
a96070d4 | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 14 | * |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 34 | */ |
8efc0c15 | 35 | |
36 | #include "includes.h" | |
187cd1fa | 37 | #include "openbsd-compat/fake-queue.h" |
87f4111f | 38 | RCSID("$OpenBSD: ssh-agent.c,v 1.103 2002/09/10 20:24:47 markus Exp $"); |
187cd1fa | 39 | |
42f11eb2 | 40 | #include <openssl/evp.h> |
41 | #include <openssl/md5.h> | |
8efc0c15 | 42 | |
43 | #include "ssh.h" | |
44 | #include "rsa.h" | |
8efc0c15 | 45 | #include "buffer.h" |
46 | #include "bufaux.h" | |
47 | #include "xmalloc.h" | |
8efc0c15 | 48 | #include "getput.h" |
4c8722d9 | 49 | #include "key.h" |
50 | #include "authfd.h" | |
188adeb2 | 51 | #include "compat.h" |
42f11eb2 | 52 | #include "log.h" |
8efc0c15 | 53 | |
2b5fe3b8 | 54 | #ifdef SMARTCARD |
2b5fe3b8 | 55 | #include "scard.h" |
dd2495cb | 56 | #endif |
2b5fe3b8 | 57 | |
17a3011c | 58 | typedef enum { |
59 | AUTH_UNUSED, | |
60 | AUTH_SOCKET, | |
61 | AUTH_CONNECTION | |
62 | } sock_type; | |
63 | ||
5260325f | 64 | typedef struct { |
65 | int fd; | |
17a3011c | 66 | sock_type type; |
5260325f | 67 | Buffer input; |
68 | Buffer output; | |
b9dd5ca1 | 69 | Buffer request; |
8efc0c15 | 70 | } SocketEntry; |
71 | ||
1e3b8b07 | 72 | u_int sockets_alloc = 0; |
8efc0c15 | 73 | SocketEntry *sockets = NULL; |
74 | ||
95f0a918 | 75 | typedef struct identity { |
76 | TAILQ_ENTRY(identity) next; | |
2e73a022 | 77 | Key *key; |
5260325f | 78 | char *comment; |
264572cc | 79 | u_int death; |
8efc0c15 | 80 | } Identity; |
81 | ||
2e73a022 | 82 | typedef struct { |
83 | int nentries; | |
95f0a918 | 84 | TAILQ_HEAD(idqueue, identity) idlist; |
2e73a022 | 85 | } Idtab; |
86 | ||
87 | /* private key table, one per protocol version */ | |
88 | Idtab idtable[3]; | |
8efc0c15 | 89 | |
90 | int max_fd = 0; | |
91 | ||
92 | /* pid of shell == parent of agent */ | |
9da5c3c9 | 93 | pid_t parent_pid = -1; |
8efc0c15 | 94 | |
95 | /* pathname and directory for AUTH_SOCKET */ | |
96 | char socket_name[1024]; | |
97 | char socket_dir[1024]; | |
98 | ||
3db7f994 | 99 | /* locking */ |
100 | int locked = 0; | |
101 | char *lock_passwd = NULL; | |
102 | ||
5260325f | 103 | #ifdef HAVE___PROGNAME |
104 | extern char *__progname; | |
260d427b | 105 | #else |
106 | char *__progname; | |
107 | #endif | |
5260325f | 108 | |
c1a4eef1 | 109 | static void |
110 | close_socket(SocketEntry *e) | |
111 | { | |
c1a4eef1 | 112 | close(e->fd); |
113 | e->fd = -1; | |
114 | e->type = AUTH_UNUSED; | |
115 | buffer_free(&e->input); | |
116 | buffer_free(&e->output); | |
117 | buffer_free(&e->request); | |
118 | } | |
119 | ||
396c147e | 120 | static void |
2e73a022 | 121 | idtab_init(void) |
122 | { | |
123 | int i; | |
e424e241 | 124 | |
6aacefa7 | 125 | for (i = 0; i <=2; i++) { |
95f0a918 | 126 | TAILQ_INIT(&idtable[i].idlist); |
2e73a022 | 127 | idtable[i].nentries = 0; |
128 | } | |
129 | } | |
130 | ||
131 | /* return private key table for requested protocol version */ | |
396c147e | 132 | static Idtab * |
2e73a022 | 133 | idtab_lookup(int version) |
134 | { | |
135 | if (version < 1 || version > 2) | |
136 | fatal("internal error, bad protocol version %d", version); | |
137 | return &idtable[version]; | |
138 | } | |
139 | ||
264572cc | 140 | static void |
141 | free_identity(Identity *id) | |
142 | { | |
143 | key_free(id->key); | |
144 | xfree(id->comment); | |
145 | xfree(id); | |
146 | } | |
147 | ||
2e73a022 | 148 | /* return matching private key for given public key */ |
95f0a918 | 149 | static Identity * |
150 | lookup_identity(Key *key, int version) | |
2e73a022 | 151 | { |
95f0a918 | 152 | Identity *id; |
153 | ||
2e73a022 | 154 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 155 | TAILQ_FOREACH(id, &tab->idlist, next) { |
156 | if (key_equal(key, id->key)) | |
157 | return (id); | |
2e73a022 | 158 | } |
95f0a918 | 159 | return (NULL); |
160 | } | |
161 | ||
2e73a022 | 162 | /* send list of supported public keys to 'client' */ |
396c147e | 163 | static void |
2e73a022 | 164 | process_request_identities(SocketEntry *e, int version) |
8efc0c15 | 165 | { |
2e73a022 | 166 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 167 | Identity *id; |
e424e241 | 168 | Buffer msg; |
5260325f | 169 | |
170 | buffer_init(&msg); | |
2e73a022 | 171 | buffer_put_char(&msg, (version == 1) ? |
172 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
173 | buffer_put_int(&msg, tab->nentries); | |
95f0a918 | 174 | TAILQ_FOREACH(id, &tab->idlist, next) { |
fa08c86b | 175 | if (id->key->type == KEY_RSA1) { |
2e73a022 | 176 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
177 | buffer_put_bignum(&msg, id->key->rsa->e); | |
178 | buffer_put_bignum(&msg, id->key->rsa->n); | |
179 | } else { | |
1e3b8b07 | 180 | u_char *blob; |
181 | u_int blen; | |
fa08c86b | 182 | key_to_blob(id->key, &blob, &blen); |
2e73a022 | 183 | buffer_put_string(&msg, blob, blen); |
184 | xfree(blob); | |
185 | } | |
186 | buffer_put_cstring(&msg, id->comment); | |
5260325f | 187 | } |
188 | buffer_put_int(&e->output, buffer_len(&msg)); | |
189 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
190 | buffer_free(&msg); | |
8efc0c15 | 191 | } |
192 | ||
2e73a022 | 193 | /* ssh1 only */ |
396c147e | 194 | static void |
2e73a022 | 195 | process_authentication_challenge1(SocketEntry *e) |
8efc0c15 | 196 | { |
e424e241 | 197 | u_char buf[32], mdbuf[16], session_id[16]; |
198 | u_int response_type; | |
2e73a022 | 199 | BIGNUM *challenge; |
e424e241 | 200 | Identity *id; |
2e73a022 | 201 | int i, len; |
5260325f | 202 | Buffer msg; |
203 | MD5_CTX md; | |
e424e241 | 204 | Key *key; |
5260325f | 205 | |
206 | buffer_init(&msg); | |
fa08c86b | 207 | key = key_new(KEY_RSA1); |
b775c6f2 | 208 | if ((challenge = BN_new()) == NULL) |
209 | fatal("process_authentication_challenge1: BN_new failed"); | |
5260325f | 210 | |
1169c3df | 211 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 212 | buffer_get_bignum(&e->request, key->rsa->e); |
213 | buffer_get_bignum(&e->request, key->rsa->n); | |
214 | buffer_get_bignum(&e->request, challenge); | |
5260325f | 215 | |
2e73a022 | 216 | /* Only protocol 1.1 is supported */ |
b9dd5ca1 | 217 | if (buffer_len(&e->request) == 0) |
2e73a022 | 218 | goto failure; |
b9dd5ca1 | 219 | buffer_get(&e->request, session_id, 16); |
220 | response_type = buffer_get_int(&e->request); | |
2e73a022 | 221 | if (response_type != 1) |
222 | goto failure; | |
223 | ||
95f0a918 | 224 | id = lookup_identity(key, 1); |
225 | if (id != NULL) { | |
226 | Key *private = id->key; | |
2e73a022 | 227 | /* Decrypt the challenge using the private key. */ |
46aa2d1f | 228 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
229 | goto failure; | |
2e73a022 | 230 | |
231 | /* The response is MD5 of decrypted challenge plus session id. */ | |
232 | len = BN_num_bytes(challenge); | |
233 | if (len <= 0 || len > 32) { | |
234 | log("process_authentication_challenge: bad challenge length %d", len); | |
235 | goto failure; | |
5260325f | 236 | } |
2e73a022 | 237 | memset(buf, 0, 32); |
238 | BN_bn2bin(challenge, buf + 32 - len); | |
239 | MD5_Init(&md); | |
240 | MD5_Update(&md, buf, 32); | |
241 | MD5_Update(&md, session_id, 16); | |
242 | MD5_Final(mdbuf, &md); | |
243 | ||
244 | /* Send the response. */ | |
245 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
246 | for (i = 0; i < 16; i++) | |
247 | buffer_put_char(&msg, mdbuf[i]); | |
248 | goto send; | |
249 | } | |
250 | ||
251 | failure: | |
252 | /* Unknown identity or protocol error. Send failure. */ | |
5260325f | 253 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
254 | send: | |
2e73a022 | 255 | buffer_put_int(&e->output, buffer_len(&msg)); |
256 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
257 | key_free(key); | |
258 | BN_clear_free(challenge); | |
259 | buffer_free(&msg); | |
260 | } | |
261 | ||
262 | /* ssh2 only */ | |
396c147e | 263 | static void |
2e73a022 | 264 | process_sign_request2(SocketEntry *e) |
265 | { | |
1e3b8b07 | 266 | u_char *blob, *data, *signature = NULL; |
267 | u_int blen, dlen, slen = 0; | |
e424e241 | 268 | extern int datafellows; |
269 | int ok = -1, flags; | |
2e73a022 | 270 | Buffer msg; |
e424e241 | 271 | Key *key; |
2e73a022 | 272 | |
273 | datafellows = 0; | |
227e8e86 | 274 | |
b9dd5ca1 | 275 | blob = buffer_get_string(&e->request, &blen); |
276 | data = buffer_get_string(&e->request, &dlen); | |
188adeb2 | 277 | |
b9dd5ca1 | 278 | flags = buffer_get_int(&e->request); |
188adeb2 | 279 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
280 | datafellows = SSH_BUG_SIGBLOB; | |
2e73a022 | 281 | |
fa08c86b | 282 | key = key_from_blob(blob, blen); |
2e73a022 | 283 | if (key != NULL) { |
95f0a918 | 284 | Identity *id = lookup_identity(key, 2); |
285 | if (id != NULL) | |
286 | ok = key_sign(id->key, &signature, &slen, data, dlen); | |
2e73a022 | 287 | } |
288 | key_free(key); | |
289 | buffer_init(&msg); | |
290 | if (ok == 0) { | |
291 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
292 | buffer_put_string(&msg, signature, slen); | |
293 | } else { | |
294 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
295 | } | |
5260325f | 296 | buffer_put_int(&e->output, buffer_len(&msg)); |
297 | buffer_append(&e->output, buffer_ptr(&msg), | |
2e73a022 | 298 | buffer_len(&msg)); |
5260325f | 299 | buffer_free(&msg); |
2e73a022 | 300 | xfree(data); |
301 | xfree(blob); | |
302 | if (signature != NULL) | |
303 | xfree(signature); | |
8efc0c15 | 304 | } |
305 | ||
2e73a022 | 306 | /* shared */ |
396c147e | 307 | static void |
2e73a022 | 308 | process_remove_identity(SocketEntry *e, int version) |
8efc0c15 | 309 | { |
e424e241 | 310 | u_int blen, bits; |
311 | int success = 0; | |
95f0a918 | 312 | Key *key = NULL; |
1e3b8b07 | 313 | u_char *blob; |
2e73a022 | 314 | |
6aacefa7 | 315 | switch (version) { |
2e73a022 | 316 | case 1: |
fa08c86b | 317 | key = key_new(KEY_RSA1); |
b9dd5ca1 | 318 | bits = buffer_get_int(&e->request); |
319 | buffer_get_bignum(&e->request, key->rsa->e); | |
320 | buffer_get_bignum(&e->request, key->rsa->n); | |
2e73a022 | 321 | |
322 | if (bits != key_size(key)) | |
e424e241 | 323 | log("Warning: identity keysize mismatch: actual %u, announced %u", |
42f11eb2 | 324 | key_size(key), bits); |
2e73a022 | 325 | break; |
326 | case 2: | |
b9dd5ca1 | 327 | blob = buffer_get_string(&e->request, &blen); |
fa08c86b | 328 | key = key_from_blob(blob, blen); |
2e73a022 | 329 | xfree(blob); |
330 | break; | |
331 | } | |
332 | if (key != NULL) { | |
95f0a918 | 333 | Identity *id = lookup_identity(key, version); |
334 | if (id != NULL) { | |
aa3378df | 335 | /* |
336 | * We have this key. Free the old key. Since we | |
337 | * don\'t want to leave empty slots in the middle of | |
d343d900 | 338 | * the array, we actually free the key there and move |
339 | * all the entries between the empty slot and the end | |
340 | * of the array. | |
aa3378df | 341 | */ |
2e73a022 | 342 | Idtab *tab = idtab_lookup(version); |
fa08c86b | 343 | if (tab->nentries < 1) |
344 | fatal("process_remove_identity: " | |
345 | "internal error: tab->nentries %d", | |
346 | tab->nentries); | |
95f0a918 | 347 | TAILQ_REMOVE(&tab->idlist, id, next); |
348 | free_identity(id); | |
2e73a022 | 349 | tab->nentries--; |
350 | success = 1; | |
5260325f | 351 | } |
2e73a022 | 352 | key_free(key); |
353 | } | |
8efc0c15 | 354 | buffer_put_int(&e->output, 1); |
2e73a022 | 355 | buffer_put_char(&e->output, |
356 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 357 | } |
358 | ||
396c147e | 359 | static void |
2e73a022 | 360 | process_remove_all_identities(SocketEntry *e, int version) |
8efc0c15 | 361 | { |
2e73a022 | 362 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 363 | Identity *id; |
8efc0c15 | 364 | |
5260325f | 365 | /* Loop over all identities and clear the keys. */ |
95f0a918 | 366 | for (id = TAILQ_FIRST(&tab->idlist); id; |
367 | id = TAILQ_FIRST(&tab->idlist)) { | |
368 | TAILQ_REMOVE(&tab->idlist, id, next); | |
369 | free_identity(id); | |
5260325f | 370 | } |
8efc0c15 | 371 | |
5260325f | 372 | /* Mark that there are no identities. */ |
2e73a022 | 373 | tab->nentries = 0; |
8efc0c15 | 374 | |
375 | /* Send success. */ | |
376 | buffer_put_int(&e->output, 1); | |
377 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
5260325f | 378 | } |
379 | ||
264572cc | 380 | static void |
381 | reaper(void) | |
382 | { | |
e424e241 | 383 | u_int now = time(NULL); |
264572cc | 384 | Identity *id, *nxt; |
385 | int version; | |
e424e241 | 386 | Idtab *tab; |
264572cc | 387 | |
388 | for (version = 1; version < 3; version++) { | |
389 | tab = idtab_lookup(version); | |
390 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
391 | nxt = TAILQ_NEXT(id, next); | |
392 | if (id->death != 0 && now >= id->death) { | |
393 | TAILQ_REMOVE(&tab->idlist, id, next); | |
394 | free_identity(id); | |
395 | tab->nentries--; | |
396 | } | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
396c147e | 401 | static void |
fa08c86b | 402 | process_add_identity(SocketEntry *e, int version) |
403 | { | |
2e73a022 | 404 | Idtab *tab = idtab_lookup(version); |
e424e241 | 405 | int type, success = 0, death = 0; |
406 | char *type_name, *comment; | |
407 | Key *k = NULL; | |
5260325f | 408 | |
2e73a022 | 409 | switch (version) { |
410 | case 1: | |
fa08c86b | 411 | k = key_new_private(KEY_RSA1); |
1169c3df | 412 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 413 | buffer_get_bignum(&e->request, k->rsa->n); |
414 | buffer_get_bignum(&e->request, k->rsa->e); | |
415 | buffer_get_bignum(&e->request, k->rsa->d); | |
416 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
2e73a022 | 417 | |
418 | /* SSH and SSL have p and q swapped */ | |
b9dd5ca1 | 419 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
420 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
2e73a022 | 421 | |
422 | /* Generate additional parameters */ | |
2b63e803 | 423 | rsa_generate_additional_parameters(k->rsa); |
2e73a022 | 424 | break; |
425 | case 2: | |
b9dd5ca1 | 426 | type_name = buffer_get_string(&e->request, NULL); |
42f11eb2 | 427 | type = key_type_from_name(type_name); |
fa08c86b | 428 | xfree(type_name); |
6aacefa7 | 429 | switch (type) { |
fa08c86b | 430 | case KEY_DSA: |
431 | k = key_new_private(type); | |
b9dd5ca1 | 432 | buffer_get_bignum2(&e->request, k->dsa->p); |
433 | buffer_get_bignum2(&e->request, k->dsa->q); | |
434 | buffer_get_bignum2(&e->request, k->dsa->g); | |
435 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
436 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
fa08c86b | 437 | break; |
438 | case KEY_RSA: | |
439 | k = key_new_private(type); | |
b9dd5ca1 | 440 | buffer_get_bignum2(&e->request, k->rsa->n); |
441 | buffer_get_bignum2(&e->request, k->rsa->e); | |
442 | buffer_get_bignum2(&e->request, k->rsa->d); | |
443 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
444 | buffer_get_bignum2(&e->request, k->rsa->p); | |
445 | buffer_get_bignum2(&e->request, k->rsa->q); | |
fa08c86b | 446 | |
447 | /* Generate additional parameters */ | |
2b63e803 | 448 | rsa_generate_additional_parameters(k->rsa); |
fa08c86b | 449 | break; |
450 | default: | |
b9dd5ca1 | 451 | buffer_clear(&e->request); |
2e73a022 | 452 | goto send; |
5260325f | 453 | } |
2e73a022 | 454 | break; |
455 | } | |
b9dd5ca1 | 456 | comment = buffer_get_string(&e->request, NULL); |
2e73a022 | 457 | if (k == NULL) { |
458 | xfree(comment); | |
459 | goto send; | |
460 | } | |
461 | success = 1; | |
ee900f87 | 462 | while (buffer_len(&e->request)) { |
463 | switch (buffer_get_char(&e->request)) { | |
464 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
465 | death = time(NULL) + buffer_get_int(&e->request); | |
466 | break; | |
467 | default: | |
468 | break; | |
469 | } | |
470 | } | |
95f0a918 | 471 | if (lookup_identity(k, version) == NULL) { |
472 | Identity *id = xmalloc(sizeof(Identity)); | |
473 | id->key = k; | |
474 | id->comment = comment; | |
ee900f87 | 475 | id->death = death; |
95f0a918 | 476 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
2e73a022 | 477 | /* Increment the number of identities. */ |
478 | tab->nentries++; | |
479 | } else { | |
480 | key_free(k); | |
481 | xfree(comment); | |
482 | } | |
483 | send: | |
5260325f | 484 | buffer_put_int(&e->output, 1); |
2e73a022 | 485 | buffer_put_char(&e->output, |
486 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 487 | } |
488 | ||
3db7f994 | 489 | /* XXX todo: encrypt sensitive data with passphrase */ |
490 | static void | |
491 | process_lock_agent(SocketEntry *e, int lock) | |
492 | { | |
3db7f994 | 493 | int success = 0; |
e424e241 | 494 | char *passwd; |
3db7f994 | 495 | |
496 | passwd = buffer_get_string(&e->request, NULL); | |
497 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
498 | locked = 0; | |
499 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
500 | xfree(lock_passwd); | |
501 | lock_passwd = NULL; | |
502 | success = 1; | |
503 | } else if (!locked && lock) { | |
504 | locked = 1; | |
505 | lock_passwd = xstrdup(passwd); | |
506 | success = 1; | |
507 | } | |
508 | memset(passwd, 0, strlen(passwd)); | |
509 | xfree(passwd); | |
7203d6bb | 510 | |
3db7f994 | 511 | buffer_put_int(&e->output, 1); |
512 | buffer_put_char(&e->output, | |
513 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
3db7f994 | 514 | } |
515 | ||
516 | static void | |
517 | no_identities(SocketEntry *e, u_int type) | |
518 | { | |
519 | Buffer msg; | |
520 | ||
521 | buffer_init(&msg); | |
522 | buffer_put_char(&msg, | |
523 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
524 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
525 | buffer_put_int(&msg, 0); | |
526 | buffer_put_int(&e->output, buffer_len(&msg)); | |
527 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
528 | buffer_free(&msg); | |
529 | } | |
2b5fe3b8 | 530 | |
531 | #ifdef SMARTCARD | |
532 | static void | |
533 | process_add_smartcard_key (SocketEntry *e) | |
534 | { | |
76139bd8 | 535 | char *sc_reader_id = NULL, *pin; |
0659cace | 536 | int i, version, success = 0; |
e424e241 | 537 | Key **keys, *k; |
538 | Identity *id; | |
539 | Idtab *tab; | |
184eed6a | 540 | |
b9dd5ca1 | 541 | sc_reader_id = buffer_get_string(&e->request, NULL); |
542 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 543 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 544 | xfree(sc_reader_id); |
76139bd8 | 545 | xfree(pin); |
2b5fe3b8 | 546 | |
0659cace | 547 | if (keys == NULL || keys[0] == NULL) { |
548 | error("sc_get_keys failed"); | |
2b5fe3b8 | 549 | goto send; |
550 | } | |
0659cace | 551 | for (i = 0; keys[i] != NULL; i++) { |
552 | k = keys[i]; | |
553 | version = k->type == KEY_RSA1 ? 1 : 2; | |
554 | tab = idtab_lookup(version); | |
555 | if (lookup_identity(k, version) == NULL) { | |
556 | id = xmalloc(sizeof(Identity)); | |
557 | id->key = k; | |
558 | id->comment = xstrdup("smartcard key"); | |
264572cc | 559 | id->death = 0; |
0659cace | 560 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
561 | tab->nentries++; | |
562 | success = 1; | |
563 | } else { | |
564 | key_free(k); | |
565 | } | |
566 | keys[i] = NULL; | |
2b5fe3b8 | 567 | } |
0659cace | 568 | xfree(keys); |
2b5fe3b8 | 569 | send: |
570 | buffer_put_int(&e->output, 1); | |
571 | buffer_put_char(&e->output, | |
572 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
573 | } | |
574 | ||
575 | static void | |
576 | process_remove_smartcard_key(SocketEntry *e) | |
577 | { | |
76139bd8 | 578 | char *sc_reader_id = NULL, *pin; |
0659cace | 579 | int i, version, success = 0; |
e424e241 | 580 | Key **keys, *k = NULL; |
581 | Identity *id; | |
582 | Idtab *tab; | |
2b5fe3b8 | 583 | |
b9dd5ca1 | 584 | sc_reader_id = buffer_get_string(&e->request, NULL); |
585 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 586 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 587 | xfree(sc_reader_id); |
76139bd8 | 588 | xfree(pin); |
2b5fe3b8 | 589 | |
0659cace | 590 | if (keys == NULL || keys[0] == NULL) { |
591 | error("sc_get_keys failed"); | |
592 | goto send; | |
593 | } | |
594 | for (i = 0; keys[i] != NULL; i++) { | |
595 | k = keys[i]; | |
596 | version = k->type == KEY_RSA1 ? 1 : 2; | |
597 | if ((id = lookup_identity(k, version)) != NULL) { | |
598 | tab = idtab_lookup(version); | |
875ec275 | 599 | TAILQ_REMOVE(&tab->idlist, id, next); |
2b5fe3b8 | 600 | tab->nentries--; |
95f0a918 | 601 | free_identity(id); |
2b5fe3b8 | 602 | success = 1; |
603 | } | |
604 | key_free(k); | |
0659cace | 605 | keys[i] = NULL; |
2b5fe3b8 | 606 | } |
0659cace | 607 | xfree(keys); |
608 | send: | |
2b5fe3b8 | 609 | buffer_put_int(&e->output, 1); |
610 | buffer_put_char(&e->output, | |
611 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
612 | } | |
3e984472 | 613 | #endif /* SMARTCARD */ |
2b5fe3b8 | 614 | |
2e73a022 | 615 | /* dispatch incoming messages */ |
616 | ||
396c147e | 617 | static void |
8efc0c15 | 618 | process_message(SocketEntry *e) |
619 | { | |
e424e241 | 620 | u_int msg_len, type; |
1e3b8b07 | 621 | u_char *cp; |
264572cc | 622 | |
623 | /* kill dead keys */ | |
624 | reaper(); | |
625 | ||
5260325f | 626 | if (buffer_len(&e->input) < 5) |
627 | return; /* Incomplete message. */ | |
20905a8e | 628 | cp = buffer_ptr(&e->input); |
5260325f | 629 | msg_len = GET_32BIT(cp); |
630 | if (msg_len > 256 * 1024) { | |
c1a4eef1 | 631 | close_socket(e); |
5260325f | 632 | return; |
633 | } | |
634 | if (buffer_len(&e->input) < msg_len + 4) | |
635 | return; | |
b9dd5ca1 | 636 | |
637 | /* move the current input to e->request */ | |
5260325f | 638 | buffer_consume(&e->input, 4); |
b9dd5ca1 | 639 | buffer_clear(&e->request); |
640 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
641 | buffer_consume(&e->input, msg_len); | |
642 | type = buffer_get_char(&e->request); | |
5260325f | 643 | |
3db7f994 | 644 | /* check wheter agent is locked */ |
645 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
646 | buffer_clear(&e->request); | |
647 | switch (type) { | |
648 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
649 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
650 | /* send empty lists */ | |
651 | no_identities(e, type); | |
652 | break; | |
653 | default: | |
654 | /* send a fail message for all other request types */ | |
655 | buffer_put_int(&e->output, 1); | |
656 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
657 | } | |
658 | return; | |
659 | } | |
660 | ||
2b5fe3b8 | 661 | debug("type %d", type); |
5260325f | 662 | switch (type) { |
3db7f994 | 663 | case SSH_AGENTC_LOCK: |
664 | case SSH_AGENTC_UNLOCK: | |
665 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
666 | break; | |
2e73a022 | 667 | /* ssh1 */ |
5260325f | 668 | case SSH_AGENTC_RSA_CHALLENGE: |
2e73a022 | 669 | process_authentication_challenge1(e); |
670 | break; | |
671 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
672 | process_request_identities(e, 1); | |
5260325f | 673 | break; |
674 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
ee900f87 | 675 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
2e73a022 | 676 | process_add_identity(e, 1); |
5260325f | 677 | break; |
678 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
2e73a022 | 679 | process_remove_identity(e, 1); |
5260325f | 680 | break; |
681 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
2e73a022 | 682 | process_remove_all_identities(e, 1); |
683 | break; | |
684 | /* ssh2 */ | |
685 | case SSH2_AGENTC_SIGN_REQUEST: | |
686 | process_sign_request2(e); | |
687 | break; | |
688 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
689 | process_request_identities(e, 2); | |
690 | break; | |
691 | case SSH2_AGENTC_ADD_IDENTITY: | |
ee900f87 | 692 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
2e73a022 | 693 | process_add_identity(e, 2); |
694 | break; | |
695 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
696 | process_remove_identity(e, 2); | |
697 | break; | |
698 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
699 | process_remove_all_identities(e, 2); | |
5260325f | 700 | break; |
2b5fe3b8 | 701 | #ifdef SMARTCARD |
702 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
703 | process_add_smartcard_key(e); | |
184eed6a | 704 | break; |
2b5fe3b8 | 705 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
706 | process_remove_smartcard_key(e); | |
184eed6a | 707 | break; |
3e984472 | 708 | #endif /* SMARTCARD */ |
5260325f | 709 | default: |
710 | /* Unknown message. Respond with failure. */ | |
711 | error("Unknown message %d", type); | |
b9dd5ca1 | 712 | buffer_clear(&e->request); |
5260325f | 713 | buffer_put_int(&e->output, 1); |
714 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
715 | break; | |
716 | } | |
8efc0c15 | 717 | } |
718 | ||
396c147e | 719 | static void |
17a3011c | 720 | new_socket(sock_type type, int fd) |
8efc0c15 | 721 | { |
1e3b8b07 | 722 | u_int i, old_alloc; |
e424e241 | 723 | |
5260325f | 724 | if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
725 | error("fcntl O_NONBLOCK: %s", strerror(errno)); | |
726 | ||
727 | if (fd > max_fd) | |
728 | max_fd = fd; | |
729 | ||
730 | for (i = 0; i < sockets_alloc; i++) | |
731 | if (sockets[i].type == AUTH_UNUSED) { | |
732 | sockets[i].fd = fd; | |
733 | sockets[i].type = type; | |
734 | buffer_init(&sockets[i].input); | |
735 | buffer_init(&sockets[i].output); | |
b9dd5ca1 | 736 | buffer_init(&sockets[i].request); |
5260325f | 737 | return; |
738 | } | |
739 | old_alloc = sockets_alloc; | |
740 | sockets_alloc += 10; | |
741 | if (sockets) | |
742 | sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0])); | |
743 | else | |
744 | sockets = xmalloc(sockets_alloc * sizeof(sockets[0])); | |
745 | for (i = old_alloc; i < sockets_alloc; i++) | |
746 | sockets[i].type = AUTH_UNUSED; | |
747 | sockets[old_alloc].type = type; | |
748 | sockets[old_alloc].fd = fd; | |
749 | buffer_init(&sockets[old_alloc].input); | |
750 | buffer_init(&sockets[old_alloc].output); | |
b9dd5ca1 | 751 | buffer_init(&sockets[old_alloc].request); |
8efc0c15 | 752 | } |
753 | ||
396c147e | 754 | static int |
e364646f | 755 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, int *nallocp) |
8efc0c15 | 756 | { |
42f11eb2 | 757 | u_int i, sz; |
758 | int n = 0; | |
759 | ||
760 | for (i = 0; i < sockets_alloc; i++) { | |
5260325f | 761 | switch (sockets[i].type) { |
762 | case AUTH_SOCKET: | |
763 | case AUTH_CONNECTION: | |
42f11eb2 | 764 | n = MAX(n, sockets[i].fd); |
5260325f | 765 | break; |
766 | case AUTH_UNUSED: | |
767 | break; | |
768 | default: | |
769 | fatal("Unknown socket type %d", sockets[i].type); | |
770 | break; | |
771 | } | |
42f11eb2 | 772 | } |
773 | ||
774 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
e364646f | 775 | if (*fdrp == NULL || sz > *nallocp) { |
42f11eb2 | 776 | if (*fdrp) |
894c5fa6 | 777 | xfree(*fdrp); |
42f11eb2 | 778 | if (*fdwp) |
894c5fa6 | 779 | xfree(*fdwp); |
42f11eb2 | 780 | *fdrp = xmalloc(sz); |
781 | *fdwp = xmalloc(sz); | |
e364646f | 782 | *nallocp = sz; |
42f11eb2 | 783 | } |
e364646f | 784 | if (n < *fdl) |
785 | debug("XXX shrink: %d < %d", n, *fdl); | |
786 | *fdl = n; | |
42f11eb2 | 787 | memset(*fdrp, 0, sz); |
788 | memset(*fdwp, 0, sz); | |
789 | ||
790 | for (i = 0; i < sockets_alloc; i++) { | |
791 | switch (sockets[i].type) { | |
792 | case AUTH_SOCKET: | |
793 | case AUTH_CONNECTION: | |
794 | FD_SET(sockets[i].fd, *fdrp); | |
795 | if (buffer_len(&sockets[i].output) > 0) | |
796 | FD_SET(sockets[i].fd, *fdwp); | |
797 | break; | |
798 | default: | |
799 | break; | |
800 | } | |
801 | } | |
802 | return (1); | |
8efc0c15 | 803 | } |
804 | ||
396c147e | 805 | static void |
5260325f | 806 | after_select(fd_set *readset, fd_set *writeset) |
8efc0c15 | 807 | { |
e424e241 | 808 | struct sockaddr_un sunaddr; |
610cd5c6 | 809 | socklen_t slen; |
5260325f | 810 | char buf[1024]; |
e424e241 | 811 | int len, sock; |
812 | u_int i; | |
87f4111f | 813 | uid_t euid; |
814 | gid_t egid; | |
5260325f | 815 | |
816 | for (i = 0; i < sockets_alloc; i++) | |
817 | switch (sockets[i].type) { | |
818 | case AUTH_UNUSED: | |
819 | break; | |
820 | case AUTH_SOCKET: | |
821 | if (FD_ISSET(sockets[i].fd, readset)) { | |
610cd5c6 | 822 | slen = sizeof(sunaddr); |
42f11eb2 | 823 | sock = accept(sockets[i].fd, |
824 | (struct sockaddr *) &sunaddr, &slen); | |
5260325f | 825 | if (sock < 0) { |
fccfbe3b | 826 | error("accept from AUTH_SOCKET: %s", |
827 | strerror(errno)); | |
5260325f | 828 | break; |
829 | } | |
87f4111f | 830 | if (getpeereid(sock, &euid, &egid) < 0) { |
831 | error("getpeereid %d failed: %s", | |
832 | sock, strerror(errno)); | |
833 | close(sock); | |
834 | break; | |
835 | } | |
836 | if (getuid() != euid) { | |
837 | error("uid mismatch: " | |
838 | "peer euid %d != uid %d", | |
839 | (int) euid, (int) getuid()); | |
840 | close(sock); | |
841 | break; | |
842 | } | |
5260325f | 843 | new_socket(AUTH_CONNECTION, sock); |
844 | } | |
845 | break; | |
846 | case AUTH_CONNECTION: | |
847 | if (buffer_len(&sockets[i].output) > 0 && | |
848 | FD_ISSET(sockets[i].fd, writeset)) { | |
bbc62e59 | 849 | do { |
850 | len = write(sockets[i].fd, | |
851 | buffer_ptr(&sockets[i].output), | |
852 | buffer_len(&sockets[i].output)); | |
853 | if (len == -1 && (errno == EAGAIN || | |
854 | errno == EINTR)) | |
855 | continue; | |
856 | break; | |
857 | } while (1); | |
5260325f | 858 | if (len <= 0) { |
c1a4eef1 | 859 | close_socket(&sockets[i]); |
5260325f | 860 | break; |
861 | } | |
862 | buffer_consume(&sockets[i].output, len); | |
863 | } | |
864 | if (FD_ISSET(sockets[i].fd, readset)) { | |
bbc62e59 | 865 | do { |
866 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
867 | if (len == -1 && (errno == EAGAIN || | |
868 | errno == EINTR)) | |
869 | continue; | |
870 | break; | |
871 | } while (1); | |
5260325f | 872 | if (len <= 0) { |
c1a4eef1 | 873 | close_socket(&sockets[i]); |
5260325f | 874 | break; |
875 | } | |
876 | buffer_append(&sockets[i].input, buf, len); | |
877 | process_message(&sockets[i]); | |
878 | } | |
879 | break; | |
880 | default: | |
881 | fatal("Unknown type %d", sockets[i].type); | |
882 | } | |
8efc0c15 | 883 | } |
884 | ||
396c147e | 885 | static void |
fccfbe3b | 886 | cleanup_socket(void *p) |
dae3fa13 | 887 | { |
2f4b2e38 | 888 | if (socket_name[0]) |
889 | unlink(socket_name); | |
890 | if (socket_dir[0]) | |
891 | rmdir(socket_dir); | |
8efc0c15 | 892 | } |
893 | ||
396c147e | 894 | static void |
dae3fa13 | 895 | cleanup_exit(int i) |
896 | { | |
fccfbe3b | 897 | cleanup_socket(NULL); |
5260325f | 898 | exit(i); |
dae3fa13 | 899 | } |
900 | ||
396c147e | 901 | static void |
2f4b2e38 | 902 | cleanup_handler(int sig) |
903 | { | |
fccfbe3b | 904 | cleanup_socket(NULL); |
2f4b2e38 | 905 | _exit(2); |
906 | } | |
907 | ||
7efa8482 | 908 | static void |
909 | check_parent_exists(int sig) | |
910 | { | |
911 | int save_errno = errno; | |
912 | ||
913 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
914 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
915 | cleanup_handler(sig); /* safe */ | |
916 | } | |
917 | signal(SIGALRM, check_parent_exists); | |
918 | alarm(10); | |
919 | errno = save_errno; | |
920 | } | |
921 | ||
396c147e | 922 | static void |
cc8aca8a | 923 | usage(void) |
dae3fa13 | 924 | { |
33e766d2 | 925 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", |
0e3c1f95 | 926 | __progname); |
33e766d2 | 927 | fprintf(stderr, "Options:\n"); |
928 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
929 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
930 | fprintf(stderr, " -k Kill the current agent.\n"); | |
931 | fprintf(stderr, " -d Debug mode.\n"); | |
3e7efb37 | 932 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
5260325f | 933 | exit(1); |
dae3fa13 | 934 | } |
935 | ||
8efc0c15 | 936 | int |
937 | main(int ac, char **av) | |
938 | { | |
e364646f | 939 | int sock, c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0, ch, nalloc; |
e424e241 | 940 | char *shell, *format, *pidstr, *agentsocket = NULL; |
941 | fd_set *readsetp = NULL, *writesetp = NULL; | |
5260325f | 942 | struct sockaddr_un sunaddr; |
b03bd394 | 943 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 944 | struct rlimit rlim; |
c7ccfd39 | 945 | #endif |
946 | #ifdef HAVE_CYGWIN | |
947 | int prev_mask; | |
b03bd394 | 948 | #endif |
c04f75f1 | 949 | extern int optind; |
ef3912be | 950 | extern char *optarg; |
e424e241 | 951 | pid_t pid; |
952 | char pidstrbuf[1 + 3 * sizeof pid]; | |
fcb975eb | 953 | |
954640a4 | 954 | /* drop */ |
955 | setegid(getgid()); | |
956 | setgid(getgid()); | |
957 | ||
457fc0c6 | 958 | SSLeay_add_all_algorithms(); |
959 | ||
260d427b | 960 | __progname = get_progname(av[0]); |
264dce47 | 961 | init_rng(); |
e339aa53 | 962 | seed_rng(); |
2b87da3b | 963 | |
3e7efb37 | 964 | while ((ch = getopt(ac, av, "cdksa:")) != -1) { |
5260325f | 965 | switch (ch) { |
966 | case 'c': | |
967 | if (s_flag) | |
968 | usage(); | |
969 | c_flag++; | |
970 | break; | |
971 | case 'k': | |
972 | k_flag++; | |
973 | break; | |
974 | case 's': | |
975 | if (c_flag) | |
976 | usage(); | |
977 | s_flag++; | |
978 | break; | |
ffdb5d70 | 979 | case 'd': |
980 | if (d_flag) | |
981 | usage(); | |
982 | d_flag++; | |
983 | break; | |
3e7efb37 | 984 | case 'a': |
985 | agentsocket = optarg; | |
986 | break; | |
5260325f | 987 | default: |
988 | usage(); | |
989 | } | |
dae3fa13 | 990 | } |
5260325f | 991 | ac -= optind; |
992 | av += optind; | |
993 | ||
ffdb5d70 | 994 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
5260325f | 995 | usage(); |
996 | ||
b745a2f2 | 997 | if (ac == 0 && !c_flag && !s_flag) { |
5260325f | 998 | shell = getenv("SHELL"); |
999 | if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
1000 | c_flag = 1; | |
dae3fa13 | 1001 | } |
5260325f | 1002 | if (k_flag) { |
1003 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); | |
1004 | if (pidstr == NULL) { | |
1005 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
42f11eb2 | 1006 | SSH_AGENTPID_ENV_NAME); |
5260325f | 1007 | exit(1); |
1008 | } | |
1009 | pid = atoi(pidstr); | |
42f11eb2 | 1010 | if (pid < 1) { |
5260325f | 1011 | fprintf(stderr, "%s=\"%s\", which is not a good PID\n", |
42f11eb2 | 1012 | SSH_AGENTPID_ENV_NAME, pidstr); |
5260325f | 1013 | exit(1); |
1014 | } | |
1015 | if (kill(pid, SIGTERM) == -1) { | |
1016 | perror("kill"); | |
1017 | exit(1); | |
1018 | } | |
1019 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1020 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1021 | printf(format, SSH_AGENTPID_ENV_NAME); | |
c457707e | 1022 | printf("echo Agent pid %ld killed;\n", (long)pid); |
5260325f | 1023 | exit(0); |
dae3fa13 | 1024 | } |
5260325f | 1025 | parent_pid = getpid(); |
1026 | ||
3e7efb37 | 1027 | if (agentsocket == NULL) { |
1028 | /* Create private directory for agent socket */ | |
1029 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir); | |
1030 | if (mkdtemp(socket_dir) == NULL) { | |
1031 | perror("mkdtemp: private socket dir"); | |
1032 | exit(1); | |
1033 | } | |
c457707e | 1034 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
1035 | (long)parent_pid); | |
3e7efb37 | 1036 | } else { |
1037 | /* Try to use specified agent socket */ | |
1038 | socket_dir[0] = '\0'; | |
1039 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
5260325f | 1040 | } |
5260325f | 1041 | |
aa3378df | 1042 | /* |
1043 | * Create socket early so it will exist before command gets run from | |
1044 | * the parent. | |
1045 | */ | |
5260325f | 1046 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
1047 | if (sock < 0) { | |
1048 | perror("socket"); | |
1049 | cleanup_exit(1); | |
1050 | } | |
1051 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1052 | sunaddr.sun_family = AF_UNIX; | |
1053 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
c7ccfd39 | 1054 | #ifdef HAVE_CYGWIN |
1055 | prev_mask = umask(0177); | |
1056 | #endif | |
5260325f | 1057 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { |
1058 | perror("bind"); | |
c7ccfd39 | 1059 | #ifdef HAVE_CYGWIN |
1060 | umask(prev_mask); | |
1061 | #endif | |
5260325f | 1062 | cleanup_exit(1); |
1063 | } | |
c7ccfd39 | 1064 | #ifdef HAVE_CYGWIN |
1065 | umask(prev_mask); | |
1066 | #endif | |
00e41835 | 1067 | if (listen(sock, 128) < 0) { |
5260325f | 1068 | perror("listen"); |
1069 | cleanup_exit(1); | |
dae3fa13 | 1070 | } |
42f11eb2 | 1071 | |
aa3378df | 1072 | /* |
1073 | * Fork, and have the parent execute the command, if any, or present | |
1074 | * the socket data. The child continues as the authentication agent. | |
1075 | */ | |
ffdb5d70 | 1076 | if (d_flag) { |
1077 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1078 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1079 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1080 | SSH_AUTHSOCKET_ENV_NAME); | |
c457707e | 1081 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
ffdb5d70 | 1082 | goto skip; |
1083 | } | |
5260325f | 1084 | pid = fork(); |
1085 | if (pid == -1) { | |
1086 | perror("fork"); | |
fccfbe3b | 1087 | cleanup_exit(1); |
dae3fa13 | 1088 | } |
5260325f | 1089 | if (pid != 0) { /* Parent - execute the given command. */ |
1090 | close(sock); | |
c457707e | 1091 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
5260325f | 1092 | if (ac == 0) { |
1093 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1094 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
42f11eb2 | 1095 | SSH_AUTHSOCKET_ENV_NAME); |
5260325f | 1096 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
42f11eb2 | 1097 | SSH_AGENTPID_ENV_NAME); |
c457707e | 1098 | printf("echo Agent pid %ld;\n", (long)pid); |
5260325f | 1099 | exit(0); |
1100 | } | |
bcbf86ec | 1101 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
1102 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1103 | perror("setenv"); | |
1104 | exit(1); | |
1105 | } | |
5260325f | 1106 | execvp(av[0], av); |
1107 | perror(av[0]); | |
1108 | exit(1); | |
1109 | } | |
fccfbe3b | 1110 | /* child */ |
1111 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
ec9f3450 | 1112 | |
1113 | if (setsid() == -1) { | |
fccfbe3b | 1114 | error("setsid: %s", strerror(errno)); |
ec9f3450 | 1115 | cleanup_exit(1); |
1116 | } | |
1117 | ||
1118 | (void)chdir("/"); | |
5260325f | 1119 | close(0); |
1120 | close(1); | |
1121 | close(2); | |
dae3fa13 | 1122 | |
b03bd394 | 1123 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1124 | /* deny core dumps, since memory contains unencrypted private keys */ |
1125 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1126 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
fccfbe3b | 1127 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
0b6fbf03 | 1128 | cleanup_exit(1); |
1129 | } | |
b03bd394 | 1130 | #endif |
ffdb5d70 | 1131 | |
1132 | skip: | |
fccfbe3b | 1133 | fatal_add_cleanup(cleanup_socket, NULL); |
5260325f | 1134 | new_socket(AUTH_SOCKET, sock); |
1135 | if (ac > 0) { | |
1136 | signal(SIGALRM, check_parent_exists); | |
1137 | alarm(10); | |
1138 | } | |
2e73a022 | 1139 | idtab_init(); |
1ee482c5 | 1140 | if (!d_flag) |
ffdb5d70 | 1141 | signal(SIGINT, SIG_IGN); |
1ee482c5 | 1142 | signal(SIGPIPE, SIG_IGN); |
2f4b2e38 | 1143 | signal(SIGHUP, cleanup_handler); |
1144 | signal(SIGTERM, cleanup_handler); | |
e364646f | 1145 | nalloc = 0; |
1146 | ||
5260325f | 1147 | while (1) { |
e364646f | 1148 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); |
42f11eb2 | 1149 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { |
5260325f | 1150 | if (errno == EINTR) |
1151 | continue; | |
fccfbe3b | 1152 | fatal("select: %s", strerror(errno)); |
5260325f | 1153 | } |
42f11eb2 | 1154 | after_select(readsetp, writesetp); |
8efc0c15 | 1155 | } |
5260325f | 1156 | /* NOTREACHED */ |
8efc0c15 | 1157 | } |