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b0f6943a | 1 | /* $OpenBSD: ssh-agent.c,v 1.145 2006/07/22 19:08:54 stevesk Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
5260325f | 6 | * The authentication agent program. |
2e73a022 | 7 | * |
bcbf86ec | 8 | * As far as I am concerned, the code I have written for this software |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
13 | * | |
a96070d4 | 14 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 15 | * |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 35 | */ |
8efc0c15 | 36 | |
37 | #include "includes.h" | |
cebb4c24 | 38 | |
39 | #include <sys/types.h> | |
3e598f1a | 40 | #include <sys/stat.h> |
5b04a8bf | 41 | #include <sys/socket.h> |
cebb4c24 | 42 | #ifdef HAVE_SYS_UN_H |
43 | # include <sys/un.h> | |
44 | #endif | |
9fd2a215 | 45 | #include "openbsd-compat/sys-queue.h" |
876faccd | 46 | #include <sys/resource.h> |
5b04a8bf | 47 | |
028094f4 | 48 | #include <errno.h> |
d3221cca | 49 | #include <fcntl.h> |
a75f5360 | 50 | #ifdef HAVE_PATHS_H |
6f61e0ec | 51 | # include <paths.h> |
a75f5360 | 52 | #endif |
ada68823 | 53 | #include <signal.h> |
b0f6943a | 54 | #include <time.h> |
5188ba17 | 55 | #include <unistd.h> |
ada68823 | 56 | |
42f11eb2 | 57 | #include <openssl/evp.h> |
58 | #include <openssl/md5.h> | |
8efc0c15 | 59 | |
60 | #include "ssh.h" | |
61 | #include "rsa.h" | |
8efc0c15 | 62 | #include "buffer.h" |
63 | #include "bufaux.h" | |
64 | #include "xmalloc.h" | |
4c8722d9 | 65 | #include "key.h" |
66 | #include "authfd.h" | |
188adeb2 | 67 | #include "compat.h" |
42f11eb2 | 68 | #include "log.h" |
c4087616 | 69 | #include "misc.h" |
8efc0c15 | 70 | |
2b5fe3b8 | 71 | #ifdef SMARTCARD |
2b5fe3b8 | 72 | #include "scard.h" |
dd2495cb | 73 | #endif |
2b5fe3b8 | 74 | |
e7f6070d | 75 | #if defined(HAVE_SYS_PRCTL_H) |
76 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ | |
77 | #endif | |
78 | ||
17a3011c | 79 | typedef enum { |
80 | AUTH_UNUSED, | |
81 | AUTH_SOCKET, | |
82 | AUTH_CONNECTION | |
83 | } sock_type; | |
84 | ||
5260325f | 85 | typedef struct { |
86 | int fd; | |
17a3011c | 87 | sock_type type; |
5260325f | 88 | Buffer input; |
89 | Buffer output; | |
b9dd5ca1 | 90 | Buffer request; |
8efc0c15 | 91 | } SocketEntry; |
92 | ||
1e3b8b07 | 93 | u_int sockets_alloc = 0; |
8efc0c15 | 94 | SocketEntry *sockets = NULL; |
95 | ||
95f0a918 | 96 | typedef struct identity { |
97 | TAILQ_ENTRY(identity) next; | |
2e73a022 | 98 | Key *key; |
5260325f | 99 | char *comment; |
264572cc | 100 | u_int death; |
c4087616 | 101 | u_int confirm; |
8efc0c15 | 102 | } Identity; |
103 | ||
2e73a022 | 104 | typedef struct { |
105 | int nentries; | |
95f0a918 | 106 | TAILQ_HEAD(idqueue, identity) idlist; |
2e73a022 | 107 | } Idtab; |
108 | ||
109 | /* private key table, one per protocol version */ | |
110 | Idtab idtable[3]; | |
8efc0c15 | 111 | |
112 | int max_fd = 0; | |
113 | ||
114 | /* pid of shell == parent of agent */ | |
9da5c3c9 | 115 | pid_t parent_pid = -1; |
8efc0c15 | 116 | |
117 | /* pathname and directory for AUTH_SOCKET */ | |
52e3daed | 118 | char socket_name[MAXPATHLEN]; |
119 | char socket_dir[MAXPATHLEN]; | |
8efc0c15 | 120 | |
3db7f994 | 121 | /* locking */ |
122 | int locked = 0; | |
123 | char *lock_passwd = NULL; | |
124 | ||
5260325f | 125 | extern char *__progname; |
5260325f | 126 | |
494b267f | 127 | /* Default lifetime (0 == forever) */ |
128 | static int lifetime = 0; | |
129 | ||
c1a4eef1 | 130 | static void |
131 | close_socket(SocketEntry *e) | |
132 | { | |
c1a4eef1 | 133 | close(e->fd); |
134 | e->fd = -1; | |
135 | e->type = AUTH_UNUSED; | |
136 | buffer_free(&e->input); | |
137 | buffer_free(&e->output); | |
138 | buffer_free(&e->request); | |
139 | } | |
140 | ||
396c147e | 141 | static void |
2e73a022 | 142 | idtab_init(void) |
143 | { | |
144 | int i; | |
e424e241 | 145 | |
6aacefa7 | 146 | for (i = 0; i <=2; i++) { |
95f0a918 | 147 | TAILQ_INIT(&idtable[i].idlist); |
2e73a022 | 148 | idtable[i].nentries = 0; |
149 | } | |
150 | } | |
151 | ||
152 | /* return private key table for requested protocol version */ | |
396c147e | 153 | static Idtab * |
2e73a022 | 154 | idtab_lookup(int version) |
155 | { | |
156 | if (version < 1 || version > 2) | |
157 | fatal("internal error, bad protocol version %d", version); | |
158 | return &idtable[version]; | |
159 | } | |
160 | ||
264572cc | 161 | static void |
162 | free_identity(Identity *id) | |
163 | { | |
164 | key_free(id->key); | |
165 | xfree(id->comment); | |
166 | xfree(id); | |
167 | } | |
168 | ||
2e73a022 | 169 | /* return matching private key for given public key */ |
95f0a918 | 170 | static Identity * |
171 | lookup_identity(Key *key, int version) | |
2e73a022 | 172 | { |
95f0a918 | 173 | Identity *id; |
174 | ||
2e73a022 | 175 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 176 | TAILQ_FOREACH(id, &tab->idlist, next) { |
177 | if (key_equal(key, id->key)) | |
178 | return (id); | |
2e73a022 | 179 | } |
95f0a918 | 180 | return (NULL); |
181 | } | |
182 | ||
c4087616 | 183 | /* Check confirmation of keysign request */ |
184 | static int | |
185 | confirm_key(Identity *id) | |
186 | { | |
7a9c7a0b | 187 | char *p; |
c4087616 | 188 | int ret = -1; |
189 | ||
190 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
7a9c7a0b | 191 | if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", |
192 | id->comment, p)) | |
193 | ret = 0; | |
c4087616 | 194 | xfree(p); |
7a9c7a0b | 195 | |
c4087616 | 196 | return (ret); |
197 | } | |
198 | ||
2e73a022 | 199 | /* send list of supported public keys to 'client' */ |
396c147e | 200 | static void |
2e73a022 | 201 | process_request_identities(SocketEntry *e, int version) |
8efc0c15 | 202 | { |
2e73a022 | 203 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 204 | Identity *id; |
e424e241 | 205 | Buffer msg; |
5260325f | 206 | |
207 | buffer_init(&msg); | |
2e73a022 | 208 | buffer_put_char(&msg, (version == 1) ? |
209 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
210 | buffer_put_int(&msg, tab->nentries); | |
95f0a918 | 211 | TAILQ_FOREACH(id, &tab->idlist, next) { |
fa08c86b | 212 | if (id->key->type == KEY_RSA1) { |
2e73a022 | 213 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
214 | buffer_put_bignum(&msg, id->key->rsa->e); | |
215 | buffer_put_bignum(&msg, id->key->rsa->n); | |
216 | } else { | |
1e3b8b07 | 217 | u_char *blob; |
218 | u_int blen; | |
fa08c86b | 219 | key_to_blob(id->key, &blob, &blen); |
2e73a022 | 220 | buffer_put_string(&msg, blob, blen); |
221 | xfree(blob); | |
222 | } | |
223 | buffer_put_cstring(&msg, id->comment); | |
5260325f | 224 | } |
225 | buffer_put_int(&e->output, buffer_len(&msg)); | |
226 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
227 | buffer_free(&msg); | |
8efc0c15 | 228 | } |
229 | ||
2e73a022 | 230 | /* ssh1 only */ |
396c147e | 231 | static void |
2e73a022 | 232 | process_authentication_challenge1(SocketEntry *e) |
8efc0c15 | 233 | { |
e424e241 | 234 | u_char buf[32], mdbuf[16], session_id[16]; |
235 | u_int response_type; | |
2e73a022 | 236 | BIGNUM *challenge; |
e424e241 | 237 | Identity *id; |
2e73a022 | 238 | int i, len; |
5260325f | 239 | Buffer msg; |
240 | MD5_CTX md; | |
e424e241 | 241 | Key *key; |
5260325f | 242 | |
243 | buffer_init(&msg); | |
fa08c86b | 244 | key = key_new(KEY_RSA1); |
b775c6f2 | 245 | if ((challenge = BN_new()) == NULL) |
246 | fatal("process_authentication_challenge1: BN_new failed"); | |
5260325f | 247 | |
1169c3df | 248 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 249 | buffer_get_bignum(&e->request, key->rsa->e); |
250 | buffer_get_bignum(&e->request, key->rsa->n); | |
251 | buffer_get_bignum(&e->request, challenge); | |
5260325f | 252 | |
2e73a022 | 253 | /* Only protocol 1.1 is supported */ |
b9dd5ca1 | 254 | if (buffer_len(&e->request) == 0) |
2e73a022 | 255 | goto failure; |
b9dd5ca1 | 256 | buffer_get(&e->request, session_id, 16); |
257 | response_type = buffer_get_int(&e->request); | |
2e73a022 | 258 | if (response_type != 1) |
259 | goto failure; | |
260 | ||
95f0a918 | 261 | id = lookup_identity(key, 1); |
c4087616 | 262 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { |
95f0a918 | 263 | Key *private = id->key; |
2e73a022 | 264 | /* Decrypt the challenge using the private key. */ |
46aa2d1f | 265 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
266 | goto failure; | |
2e73a022 | 267 | |
268 | /* The response is MD5 of decrypted challenge plus session id. */ | |
269 | len = BN_num_bytes(challenge); | |
270 | if (len <= 0 || len > 32) { | |
bbe88b6d | 271 | logit("process_authentication_challenge: bad challenge length %d", len); |
2e73a022 | 272 | goto failure; |
5260325f | 273 | } |
2e73a022 | 274 | memset(buf, 0, 32); |
275 | BN_bn2bin(challenge, buf + 32 - len); | |
276 | MD5_Init(&md); | |
277 | MD5_Update(&md, buf, 32); | |
278 | MD5_Update(&md, session_id, 16); | |
279 | MD5_Final(mdbuf, &md); | |
280 | ||
281 | /* Send the response. */ | |
282 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
283 | for (i = 0; i < 16; i++) | |
284 | buffer_put_char(&msg, mdbuf[i]); | |
285 | goto send; | |
286 | } | |
287 | ||
288 | failure: | |
289 | /* Unknown identity or protocol error. Send failure. */ | |
5260325f | 290 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
291 | send: | |
2e73a022 | 292 | buffer_put_int(&e->output, buffer_len(&msg)); |
293 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
294 | key_free(key); | |
295 | BN_clear_free(challenge); | |
296 | buffer_free(&msg); | |
297 | } | |
298 | ||
299 | /* ssh2 only */ | |
396c147e | 300 | static void |
2e73a022 | 301 | process_sign_request2(SocketEntry *e) |
302 | { | |
1e3b8b07 | 303 | u_char *blob, *data, *signature = NULL; |
304 | u_int blen, dlen, slen = 0; | |
e424e241 | 305 | extern int datafellows; |
306 | int ok = -1, flags; | |
2e73a022 | 307 | Buffer msg; |
e424e241 | 308 | Key *key; |
2e73a022 | 309 | |
310 | datafellows = 0; | |
227e8e86 | 311 | |
b9dd5ca1 | 312 | blob = buffer_get_string(&e->request, &blen); |
313 | data = buffer_get_string(&e->request, &dlen); | |
188adeb2 | 314 | |
b9dd5ca1 | 315 | flags = buffer_get_int(&e->request); |
188adeb2 | 316 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
317 | datafellows = SSH_BUG_SIGBLOB; | |
2e73a022 | 318 | |
fa08c86b | 319 | key = key_from_blob(blob, blen); |
2e73a022 | 320 | if (key != NULL) { |
95f0a918 | 321 | Identity *id = lookup_identity(key, 2); |
c4087616 | 322 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) |
95f0a918 | 323 | ok = key_sign(id->key, &signature, &slen, data, dlen); |
2b8dc5e3 | 324 | key_free(key); |
2e73a022 | 325 | } |
2e73a022 | 326 | buffer_init(&msg); |
327 | if (ok == 0) { | |
328 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
329 | buffer_put_string(&msg, signature, slen); | |
330 | } else { | |
331 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
332 | } | |
5260325f | 333 | buffer_put_int(&e->output, buffer_len(&msg)); |
334 | buffer_append(&e->output, buffer_ptr(&msg), | |
2e73a022 | 335 | buffer_len(&msg)); |
5260325f | 336 | buffer_free(&msg); |
2e73a022 | 337 | xfree(data); |
338 | xfree(blob); | |
339 | if (signature != NULL) | |
340 | xfree(signature); | |
8efc0c15 | 341 | } |
342 | ||
2e73a022 | 343 | /* shared */ |
396c147e | 344 | static void |
2e73a022 | 345 | process_remove_identity(SocketEntry *e, int version) |
8efc0c15 | 346 | { |
e424e241 | 347 | u_int blen, bits; |
348 | int success = 0; | |
95f0a918 | 349 | Key *key = NULL; |
1e3b8b07 | 350 | u_char *blob; |
2e73a022 | 351 | |
6aacefa7 | 352 | switch (version) { |
2e73a022 | 353 | case 1: |
fa08c86b | 354 | key = key_new(KEY_RSA1); |
b9dd5ca1 | 355 | bits = buffer_get_int(&e->request); |
356 | buffer_get_bignum(&e->request, key->rsa->e); | |
357 | buffer_get_bignum(&e->request, key->rsa->n); | |
2e73a022 | 358 | |
359 | if (bits != key_size(key)) | |
bbe88b6d | 360 | logit("Warning: identity keysize mismatch: actual %u, announced %u", |
42f11eb2 | 361 | key_size(key), bits); |
2e73a022 | 362 | break; |
363 | case 2: | |
b9dd5ca1 | 364 | blob = buffer_get_string(&e->request, &blen); |
fa08c86b | 365 | key = key_from_blob(blob, blen); |
2e73a022 | 366 | xfree(blob); |
367 | break; | |
368 | } | |
369 | if (key != NULL) { | |
95f0a918 | 370 | Identity *id = lookup_identity(key, version); |
371 | if (id != NULL) { | |
aa3378df | 372 | /* |
373 | * We have this key. Free the old key. Since we | |
7b9b0103 | 374 | * don't want to leave empty slots in the middle of |
d343d900 | 375 | * the array, we actually free the key there and move |
376 | * all the entries between the empty slot and the end | |
377 | * of the array. | |
aa3378df | 378 | */ |
2e73a022 | 379 | Idtab *tab = idtab_lookup(version); |
fa08c86b | 380 | if (tab->nentries < 1) |
381 | fatal("process_remove_identity: " | |
382 | "internal error: tab->nentries %d", | |
383 | tab->nentries); | |
95f0a918 | 384 | TAILQ_REMOVE(&tab->idlist, id, next); |
385 | free_identity(id); | |
2e73a022 | 386 | tab->nentries--; |
387 | success = 1; | |
5260325f | 388 | } |
2e73a022 | 389 | key_free(key); |
390 | } | |
8efc0c15 | 391 | buffer_put_int(&e->output, 1); |
2e73a022 | 392 | buffer_put_char(&e->output, |
393 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 394 | } |
395 | ||
396c147e | 396 | static void |
2e73a022 | 397 | process_remove_all_identities(SocketEntry *e, int version) |
8efc0c15 | 398 | { |
2e73a022 | 399 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 400 | Identity *id; |
8efc0c15 | 401 | |
5260325f | 402 | /* Loop over all identities and clear the keys. */ |
95f0a918 | 403 | for (id = TAILQ_FIRST(&tab->idlist); id; |
404 | id = TAILQ_FIRST(&tab->idlist)) { | |
405 | TAILQ_REMOVE(&tab->idlist, id, next); | |
406 | free_identity(id); | |
5260325f | 407 | } |
8efc0c15 | 408 | |
5260325f | 409 | /* Mark that there are no identities. */ |
2e73a022 | 410 | tab->nentries = 0; |
8efc0c15 | 411 | |
412 | /* Send success. */ | |
413 | buffer_put_int(&e->output, 1); | |
414 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
5260325f | 415 | } |
416 | ||
264572cc | 417 | static void |
418 | reaper(void) | |
419 | { | |
e424e241 | 420 | u_int now = time(NULL); |
264572cc | 421 | Identity *id, *nxt; |
422 | int version; | |
e424e241 | 423 | Idtab *tab; |
264572cc | 424 | |
425 | for (version = 1; version < 3; version++) { | |
426 | tab = idtab_lookup(version); | |
427 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
428 | nxt = TAILQ_NEXT(id, next); | |
429 | if (id->death != 0 && now >= id->death) { | |
430 | TAILQ_REMOVE(&tab->idlist, id, next); | |
431 | free_identity(id); | |
432 | tab->nentries--; | |
433 | } | |
434 | } | |
435 | } | |
436 | } | |
437 | ||
396c147e | 438 | static void |
fa08c86b | 439 | process_add_identity(SocketEntry *e, int version) |
440 | { | |
2e73a022 | 441 | Idtab *tab = idtab_lookup(version); |
c4087616 | 442 | int type, success = 0, death = 0, confirm = 0; |
e424e241 | 443 | char *type_name, *comment; |
444 | Key *k = NULL; | |
5260325f | 445 | |
2e73a022 | 446 | switch (version) { |
447 | case 1: | |
fa08c86b | 448 | k = key_new_private(KEY_RSA1); |
1169c3df | 449 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 450 | buffer_get_bignum(&e->request, k->rsa->n); |
451 | buffer_get_bignum(&e->request, k->rsa->e); | |
452 | buffer_get_bignum(&e->request, k->rsa->d); | |
453 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
2e73a022 | 454 | |
455 | /* SSH and SSL have p and q swapped */ | |
b9dd5ca1 | 456 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
457 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
2e73a022 | 458 | |
459 | /* Generate additional parameters */ | |
2b63e803 | 460 | rsa_generate_additional_parameters(k->rsa); |
2e73a022 | 461 | break; |
462 | case 2: | |
b9dd5ca1 | 463 | type_name = buffer_get_string(&e->request, NULL); |
42f11eb2 | 464 | type = key_type_from_name(type_name); |
fa08c86b | 465 | xfree(type_name); |
6aacefa7 | 466 | switch (type) { |
fa08c86b | 467 | case KEY_DSA: |
468 | k = key_new_private(type); | |
b9dd5ca1 | 469 | buffer_get_bignum2(&e->request, k->dsa->p); |
470 | buffer_get_bignum2(&e->request, k->dsa->q); | |
471 | buffer_get_bignum2(&e->request, k->dsa->g); | |
472 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
473 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
fa08c86b | 474 | break; |
475 | case KEY_RSA: | |
476 | k = key_new_private(type); | |
b9dd5ca1 | 477 | buffer_get_bignum2(&e->request, k->rsa->n); |
478 | buffer_get_bignum2(&e->request, k->rsa->e); | |
479 | buffer_get_bignum2(&e->request, k->rsa->d); | |
480 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
481 | buffer_get_bignum2(&e->request, k->rsa->p); | |
482 | buffer_get_bignum2(&e->request, k->rsa->q); | |
fa08c86b | 483 | |
484 | /* Generate additional parameters */ | |
2b63e803 | 485 | rsa_generate_additional_parameters(k->rsa); |
fa08c86b | 486 | break; |
487 | default: | |
b9dd5ca1 | 488 | buffer_clear(&e->request); |
2e73a022 | 489 | goto send; |
5260325f | 490 | } |
2e73a022 | 491 | break; |
492 | } | |
cb0e1d67 | 493 | /* enable blinding */ |
494 | switch (k->type) { | |
495 | case KEY_RSA: | |
496 | case KEY_RSA1: | |
497 | if (RSA_blinding_on(k->rsa, NULL) != 1) { | |
498 | error("process_add_identity: RSA_blinding_on failed"); | |
499 | key_free(k); | |
500 | goto send; | |
501 | } | |
502 | break; | |
503 | } | |
b9dd5ca1 | 504 | comment = buffer_get_string(&e->request, NULL); |
2e73a022 | 505 | if (k == NULL) { |
506 | xfree(comment); | |
507 | goto send; | |
508 | } | |
509 | success = 1; | |
ee900f87 | 510 | while (buffer_len(&e->request)) { |
511 | switch (buffer_get_char(&e->request)) { | |
512 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
513 | death = time(NULL) + buffer_get_int(&e->request); | |
514 | break; | |
c4087616 | 515 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
516 | confirm = 1; | |
517 | break; | |
ee900f87 | 518 | default: |
519 | break; | |
520 | } | |
521 | } | |
494b267f | 522 | if (lifetime && !death) |
523 | death = time(NULL) + lifetime; | |
95f0a918 | 524 | if (lookup_identity(k, version) == NULL) { |
525 | Identity *id = xmalloc(sizeof(Identity)); | |
526 | id->key = k; | |
527 | id->comment = comment; | |
ee900f87 | 528 | id->death = death; |
c4087616 | 529 | id->confirm = confirm; |
95f0a918 | 530 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
2e73a022 | 531 | /* Increment the number of identities. */ |
532 | tab->nentries++; | |
533 | } else { | |
534 | key_free(k); | |
535 | xfree(comment); | |
536 | } | |
537 | send: | |
5260325f | 538 | buffer_put_int(&e->output, 1); |
2e73a022 | 539 | buffer_put_char(&e->output, |
540 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 541 | } |
542 | ||
3db7f994 | 543 | /* XXX todo: encrypt sensitive data with passphrase */ |
544 | static void | |
545 | process_lock_agent(SocketEntry *e, int lock) | |
546 | { | |
3db7f994 | 547 | int success = 0; |
e424e241 | 548 | char *passwd; |
3db7f994 | 549 | |
550 | passwd = buffer_get_string(&e->request, NULL); | |
551 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
552 | locked = 0; | |
553 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
554 | xfree(lock_passwd); | |
555 | lock_passwd = NULL; | |
556 | success = 1; | |
557 | } else if (!locked && lock) { | |
558 | locked = 1; | |
559 | lock_passwd = xstrdup(passwd); | |
560 | success = 1; | |
561 | } | |
562 | memset(passwd, 0, strlen(passwd)); | |
563 | xfree(passwd); | |
7203d6bb | 564 | |
3db7f994 | 565 | buffer_put_int(&e->output, 1); |
566 | buffer_put_char(&e->output, | |
567 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
3db7f994 | 568 | } |
569 | ||
570 | static void | |
571 | no_identities(SocketEntry *e, u_int type) | |
572 | { | |
573 | Buffer msg; | |
574 | ||
575 | buffer_init(&msg); | |
576 | buffer_put_char(&msg, | |
577 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
578 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
579 | buffer_put_int(&msg, 0); | |
580 | buffer_put_int(&e->output, buffer_len(&msg)); | |
581 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
582 | buffer_free(&msg); | |
583 | } | |
2b5fe3b8 | 584 | |
585 | #ifdef SMARTCARD | |
586 | static void | |
587 | process_add_smartcard_key (SocketEntry *e) | |
588 | { | |
76139bd8 | 589 | char *sc_reader_id = NULL, *pin; |
ca719034 | 590 | int i, version, success = 0, death = 0, confirm = 0; |
e424e241 | 591 | Key **keys, *k; |
592 | Identity *id; | |
593 | Idtab *tab; | |
184eed6a | 594 | |
b9dd5ca1 | 595 | sc_reader_id = buffer_get_string(&e->request, NULL); |
596 | pin = buffer_get_string(&e->request, NULL); | |
ca719034 | 597 | |
598 | while (buffer_len(&e->request)) { | |
599 | switch (buffer_get_char(&e->request)) { | |
600 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
601 | death = time(NULL) + buffer_get_int(&e->request); | |
602 | break; | |
603 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
604 | confirm = 1; | |
605 | break; | |
606 | default: | |
607 | break; | |
608 | } | |
609 | } | |
610 | if (lifetime && !death) | |
611 | death = time(NULL) + lifetime; | |
612 | ||
0659cace | 613 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 614 | xfree(sc_reader_id); |
76139bd8 | 615 | xfree(pin); |
2b5fe3b8 | 616 | |
0659cace | 617 | if (keys == NULL || keys[0] == NULL) { |
618 | error("sc_get_keys failed"); | |
2b5fe3b8 | 619 | goto send; |
620 | } | |
0659cace | 621 | for (i = 0; keys[i] != NULL; i++) { |
622 | k = keys[i]; | |
623 | version = k->type == KEY_RSA1 ? 1 : 2; | |
624 | tab = idtab_lookup(version); | |
625 | if (lookup_identity(k, version) == NULL) { | |
626 | id = xmalloc(sizeof(Identity)); | |
627 | id->key = k; | |
244e796f | 628 | id->comment = sc_get_key_label(k); |
ca719034 | 629 | id->death = death; |
630 | id->confirm = confirm; | |
0659cace | 631 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
632 | tab->nentries++; | |
633 | success = 1; | |
634 | } else { | |
635 | key_free(k); | |
636 | } | |
637 | keys[i] = NULL; | |
2b5fe3b8 | 638 | } |
0659cace | 639 | xfree(keys); |
2b5fe3b8 | 640 | send: |
641 | buffer_put_int(&e->output, 1); | |
642 | buffer_put_char(&e->output, | |
643 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
644 | } | |
645 | ||
646 | static void | |
647 | process_remove_smartcard_key(SocketEntry *e) | |
648 | { | |
76139bd8 | 649 | char *sc_reader_id = NULL, *pin; |
0659cace | 650 | int i, version, success = 0; |
e424e241 | 651 | Key **keys, *k = NULL; |
652 | Identity *id; | |
653 | Idtab *tab; | |
2b5fe3b8 | 654 | |
b9dd5ca1 | 655 | sc_reader_id = buffer_get_string(&e->request, NULL); |
656 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 657 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 658 | xfree(sc_reader_id); |
76139bd8 | 659 | xfree(pin); |
2b5fe3b8 | 660 | |
0659cace | 661 | if (keys == NULL || keys[0] == NULL) { |
662 | error("sc_get_keys failed"); | |
663 | goto send; | |
664 | } | |
665 | for (i = 0; keys[i] != NULL; i++) { | |
666 | k = keys[i]; | |
667 | version = k->type == KEY_RSA1 ? 1 : 2; | |
668 | if ((id = lookup_identity(k, version)) != NULL) { | |
669 | tab = idtab_lookup(version); | |
875ec275 | 670 | TAILQ_REMOVE(&tab->idlist, id, next); |
2b5fe3b8 | 671 | tab->nentries--; |
95f0a918 | 672 | free_identity(id); |
2b5fe3b8 | 673 | success = 1; |
674 | } | |
675 | key_free(k); | |
0659cace | 676 | keys[i] = NULL; |
2b5fe3b8 | 677 | } |
0659cace | 678 | xfree(keys); |
679 | send: | |
2b5fe3b8 | 680 | buffer_put_int(&e->output, 1); |
681 | buffer_put_char(&e->output, | |
682 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
683 | } | |
3e984472 | 684 | #endif /* SMARTCARD */ |
2b5fe3b8 | 685 | |
2e73a022 | 686 | /* dispatch incoming messages */ |
687 | ||
396c147e | 688 | static void |
8efc0c15 | 689 | process_message(SocketEntry *e) |
690 | { | |
e424e241 | 691 | u_int msg_len, type; |
1e3b8b07 | 692 | u_char *cp; |
264572cc | 693 | |
694 | /* kill dead keys */ | |
695 | reaper(); | |
696 | ||
5260325f | 697 | if (buffer_len(&e->input) < 5) |
698 | return; /* Incomplete message. */ | |
20905a8e | 699 | cp = buffer_ptr(&e->input); |
51e7a012 | 700 | msg_len = get_u32(cp); |
5260325f | 701 | if (msg_len > 256 * 1024) { |
c1a4eef1 | 702 | close_socket(e); |
5260325f | 703 | return; |
704 | } | |
705 | if (buffer_len(&e->input) < msg_len + 4) | |
706 | return; | |
b9dd5ca1 | 707 | |
708 | /* move the current input to e->request */ | |
5260325f | 709 | buffer_consume(&e->input, 4); |
b9dd5ca1 | 710 | buffer_clear(&e->request); |
711 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
712 | buffer_consume(&e->input, msg_len); | |
713 | type = buffer_get_char(&e->request); | |
5260325f | 714 | |
3db7f994 | 715 | /* check wheter agent is locked */ |
716 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
717 | buffer_clear(&e->request); | |
718 | switch (type) { | |
719 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
720 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
721 | /* send empty lists */ | |
722 | no_identities(e, type); | |
723 | break; | |
724 | default: | |
725 | /* send a fail message for all other request types */ | |
726 | buffer_put_int(&e->output, 1); | |
727 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
728 | } | |
729 | return; | |
730 | } | |
731 | ||
2b5fe3b8 | 732 | debug("type %d", type); |
5260325f | 733 | switch (type) { |
3db7f994 | 734 | case SSH_AGENTC_LOCK: |
735 | case SSH_AGENTC_UNLOCK: | |
736 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
737 | break; | |
2e73a022 | 738 | /* ssh1 */ |
5260325f | 739 | case SSH_AGENTC_RSA_CHALLENGE: |
2e73a022 | 740 | process_authentication_challenge1(e); |
741 | break; | |
742 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
743 | process_request_identities(e, 1); | |
5260325f | 744 | break; |
745 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
ee900f87 | 746 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
2e73a022 | 747 | process_add_identity(e, 1); |
5260325f | 748 | break; |
749 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
2e73a022 | 750 | process_remove_identity(e, 1); |
5260325f | 751 | break; |
752 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
2e73a022 | 753 | process_remove_all_identities(e, 1); |
754 | break; | |
755 | /* ssh2 */ | |
756 | case SSH2_AGENTC_SIGN_REQUEST: | |
757 | process_sign_request2(e); | |
758 | break; | |
759 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
760 | process_request_identities(e, 2); | |
761 | break; | |
762 | case SSH2_AGENTC_ADD_IDENTITY: | |
ee900f87 | 763 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
2e73a022 | 764 | process_add_identity(e, 2); |
765 | break; | |
766 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
767 | process_remove_identity(e, 2); | |
768 | break; | |
769 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
770 | process_remove_all_identities(e, 2); | |
5260325f | 771 | break; |
2b5fe3b8 | 772 | #ifdef SMARTCARD |
773 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
ca719034 | 774 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: |
2b5fe3b8 | 775 | process_add_smartcard_key(e); |
184eed6a | 776 | break; |
2b5fe3b8 | 777 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
778 | process_remove_smartcard_key(e); | |
184eed6a | 779 | break; |
3e984472 | 780 | #endif /* SMARTCARD */ |
5260325f | 781 | default: |
782 | /* Unknown message. Respond with failure. */ | |
783 | error("Unknown message %d", type); | |
b9dd5ca1 | 784 | buffer_clear(&e->request); |
5260325f | 785 | buffer_put_int(&e->output, 1); |
786 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
787 | break; | |
788 | } | |
8efc0c15 | 789 | } |
790 | ||
396c147e | 791 | static void |
17a3011c | 792 | new_socket(sock_type type, int fd) |
8efc0c15 | 793 | { |
c46e584f | 794 | u_int i, old_alloc, new_alloc; |
e424e241 | 795 | |
170694d7 | 796 | set_nonblock(fd); |
5260325f | 797 | |
798 | if (fd > max_fd) | |
799 | max_fd = fd; | |
800 | ||
801 | for (i = 0; i < sockets_alloc; i++) | |
802 | if (sockets[i].type == AUTH_UNUSED) { | |
803 | sockets[i].fd = fd; | |
5260325f | 804 | buffer_init(&sockets[i].input); |
805 | buffer_init(&sockets[i].output); | |
b9dd5ca1 | 806 | buffer_init(&sockets[i].request); |
c46e584f | 807 | sockets[i].type = type; |
5260325f | 808 | return; |
809 | } | |
810 | old_alloc = sockets_alloc; | |
c46e584f | 811 | new_alloc = sockets_alloc + 10; |
c5d10563 | 812 | sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); |
c46e584f | 813 | for (i = old_alloc; i < new_alloc; i++) |
5260325f | 814 | sockets[i].type = AUTH_UNUSED; |
c46e584f | 815 | sockets_alloc = new_alloc; |
5260325f | 816 | sockets[old_alloc].fd = fd; |
817 | buffer_init(&sockets[old_alloc].input); | |
818 | buffer_init(&sockets[old_alloc].output); | |
b9dd5ca1 | 819 | buffer_init(&sockets[old_alloc].request); |
c46e584f | 820 | sockets[old_alloc].type = type; |
8efc0c15 | 821 | } |
822 | ||
396c147e | 823 | static int |
9a995072 | 824 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp) |
8efc0c15 | 825 | { |
42f11eb2 | 826 | u_int i, sz; |
827 | int n = 0; | |
828 | ||
829 | for (i = 0; i < sockets_alloc; i++) { | |
5260325f | 830 | switch (sockets[i].type) { |
831 | case AUTH_SOCKET: | |
832 | case AUTH_CONNECTION: | |
42f11eb2 | 833 | n = MAX(n, sockets[i].fd); |
5260325f | 834 | break; |
835 | case AUTH_UNUSED: | |
836 | break; | |
837 | default: | |
838 | fatal("Unknown socket type %d", sockets[i].type); | |
839 | break; | |
840 | } | |
42f11eb2 | 841 | } |
842 | ||
843 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
e364646f | 844 | if (*fdrp == NULL || sz > *nallocp) { |
42f11eb2 | 845 | if (*fdrp) |
894c5fa6 | 846 | xfree(*fdrp); |
42f11eb2 | 847 | if (*fdwp) |
894c5fa6 | 848 | xfree(*fdwp); |
42f11eb2 | 849 | *fdrp = xmalloc(sz); |
850 | *fdwp = xmalloc(sz); | |
e364646f | 851 | *nallocp = sz; |
42f11eb2 | 852 | } |
e364646f | 853 | if (n < *fdl) |
854 | debug("XXX shrink: %d < %d", n, *fdl); | |
855 | *fdl = n; | |
42f11eb2 | 856 | memset(*fdrp, 0, sz); |
857 | memset(*fdwp, 0, sz); | |
858 | ||
859 | for (i = 0; i < sockets_alloc; i++) { | |
860 | switch (sockets[i].type) { | |
861 | case AUTH_SOCKET: | |
862 | case AUTH_CONNECTION: | |
863 | FD_SET(sockets[i].fd, *fdrp); | |
864 | if (buffer_len(&sockets[i].output) > 0) | |
865 | FD_SET(sockets[i].fd, *fdwp); | |
866 | break; | |
867 | default: | |
868 | break; | |
869 | } | |
870 | } | |
871 | return (1); | |
8efc0c15 | 872 | } |
873 | ||
396c147e | 874 | static void |
5260325f | 875 | after_select(fd_set *readset, fd_set *writeset) |
8efc0c15 | 876 | { |
e424e241 | 877 | struct sockaddr_un sunaddr; |
610cd5c6 | 878 | socklen_t slen; |
5260325f | 879 | char buf[1024]; |
e424e241 | 880 | int len, sock; |
881 | u_int i; | |
87f4111f | 882 | uid_t euid; |
883 | gid_t egid; | |
5260325f | 884 | |
885 | for (i = 0; i < sockets_alloc; i++) | |
886 | switch (sockets[i].type) { | |
887 | case AUTH_UNUSED: | |
888 | break; | |
889 | case AUTH_SOCKET: | |
890 | if (FD_ISSET(sockets[i].fd, readset)) { | |
610cd5c6 | 891 | slen = sizeof(sunaddr); |
42f11eb2 | 892 | sock = accept(sockets[i].fd, |
32596c7b | 893 | (struct sockaddr *)&sunaddr, &slen); |
5260325f | 894 | if (sock < 0) { |
fccfbe3b | 895 | error("accept from AUTH_SOCKET: %s", |
896 | strerror(errno)); | |
5260325f | 897 | break; |
898 | } | |
87f4111f | 899 | if (getpeereid(sock, &euid, &egid) < 0) { |
900 | error("getpeereid %d failed: %s", | |
901 | sock, strerror(errno)); | |
902 | close(sock); | |
903 | break; | |
904 | } | |
e139021d | 905 | if ((euid != 0) && (getuid() != euid)) { |
87f4111f | 906 | error("uid mismatch: " |
792e7d2d | 907 | "peer euid %u != uid %u", |
908 | (u_int) euid, (u_int) getuid()); | |
87f4111f | 909 | close(sock); |
910 | break; | |
911 | } | |
5260325f | 912 | new_socket(AUTH_CONNECTION, sock); |
913 | } | |
914 | break; | |
915 | case AUTH_CONNECTION: | |
916 | if (buffer_len(&sockets[i].output) > 0 && | |
917 | FD_ISSET(sockets[i].fd, writeset)) { | |
bbc62e59 | 918 | do { |
919 | len = write(sockets[i].fd, | |
920 | buffer_ptr(&sockets[i].output), | |
921 | buffer_len(&sockets[i].output)); | |
922 | if (len == -1 && (errno == EAGAIN || | |
923 | errno == EINTR)) | |
924 | continue; | |
925 | break; | |
926 | } while (1); | |
5260325f | 927 | if (len <= 0) { |
c1a4eef1 | 928 | close_socket(&sockets[i]); |
5260325f | 929 | break; |
930 | } | |
931 | buffer_consume(&sockets[i].output, len); | |
932 | } | |
933 | if (FD_ISSET(sockets[i].fd, readset)) { | |
bbc62e59 | 934 | do { |
935 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
936 | if (len == -1 && (errno == EAGAIN || | |
937 | errno == EINTR)) | |
938 | continue; | |
939 | break; | |
940 | } while (1); | |
5260325f | 941 | if (len <= 0) { |
c1a4eef1 | 942 | close_socket(&sockets[i]); |
5260325f | 943 | break; |
944 | } | |
945 | buffer_append(&sockets[i].input, buf, len); | |
946 | process_message(&sockets[i]); | |
947 | } | |
948 | break; | |
949 | default: | |
950 | fatal("Unknown type %d", sockets[i].type); | |
951 | } | |
8efc0c15 | 952 | } |
953 | ||
396c147e | 954 | static void |
cd25664d | 955 | cleanup_socket(void) |
dae3fa13 | 956 | { |
2f4b2e38 | 957 | if (socket_name[0]) |
958 | unlink(socket_name); | |
959 | if (socket_dir[0]) | |
960 | rmdir(socket_dir); | |
8efc0c15 | 961 | } |
962 | ||
2362db19 | 963 | void |
dae3fa13 | 964 | cleanup_exit(int i) |
965 | { | |
cd25664d | 966 | cleanup_socket(); |
967 | _exit(i); | |
dae3fa13 | 968 | } |
969 | ||
8d0b0353 | 970 | /*ARGSUSED*/ |
396c147e | 971 | static void |
2f4b2e38 | 972 | cleanup_handler(int sig) |
973 | { | |
cd25664d | 974 | cleanup_socket(); |
2f4b2e38 | 975 | _exit(2); |
976 | } | |
977 | ||
8d0b0353 | 978 | /*ARGSUSED*/ |
7efa8482 | 979 | static void |
980 | check_parent_exists(int sig) | |
981 | { | |
982 | int save_errno = errno; | |
983 | ||
984 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
985 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
986 | cleanup_handler(sig); /* safe */ | |
987 | } | |
8d9bb5dd | 988 | mysignal(SIGALRM, check_parent_exists); |
7efa8482 | 989 | alarm(10); |
990 | errno = save_errno; | |
991 | } | |
992 | ||
396c147e | 993 | static void |
cc8aca8a | 994 | usage(void) |
dae3fa13 | 995 | { |
33e766d2 | 996 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", |
0e3c1f95 | 997 | __progname); |
33e766d2 | 998 | fprintf(stderr, "Options:\n"); |
999 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
1000 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
1001 | fprintf(stderr, " -k Kill the current agent.\n"); | |
1002 | fprintf(stderr, " -d Debug mode.\n"); | |
3e7efb37 | 1003 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
494b267f | 1004 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); |
5260325f | 1005 | exit(1); |
dae3fa13 | 1006 | } |
1007 | ||
8efc0c15 | 1008 | int |
1009 | main(int ac, char **av) | |
1010 | { | |
c4087616 | 1011 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; |
9a995072 | 1012 | int sock, fd, ch; |
1013 | u_int nalloc; | |
e424e241 | 1014 | char *shell, *format, *pidstr, *agentsocket = NULL; |
1015 | fd_set *readsetp = NULL, *writesetp = NULL; | |
5260325f | 1016 | struct sockaddr_un sunaddr; |
b03bd394 | 1017 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1018 | struct rlimit rlim; |
c7ccfd39 | 1019 | #endif |
c7ccfd39 | 1020 | int prev_mask; |
c04f75f1 | 1021 | extern int optind; |
ef3912be | 1022 | extern char *optarg; |
e424e241 | 1023 | pid_t pid; |
1024 | char pidstrbuf[1 + 3 * sizeof pid]; | |
fcb975eb | 1025 | |
fd6168c1 | 1026 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
1027 | sanitise_stdfd(); | |
1028 | ||
954640a4 | 1029 | /* drop */ |
1030 | setegid(getgid()); | |
1031 | setgid(getgid()); | |
1032 | ||
e7f6070d | 1033 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) |
1034 | /* Disable ptrace on Linux without sgid bit */ | |
1035 | prctl(PR_SET_DUMPABLE, 0); | |
1036 | #endif | |
1037 | ||
457fc0c6 | 1038 | SSLeay_add_all_algorithms(); |
1039 | ||
fda04d7d | 1040 | __progname = ssh_get_progname(av[0]); |
264dce47 | 1041 | init_rng(); |
e339aa53 | 1042 | seed_rng(); |
2b87da3b | 1043 | |
494b267f | 1044 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { |
5260325f | 1045 | switch (ch) { |
1046 | case 'c': | |
1047 | if (s_flag) | |
1048 | usage(); | |
1049 | c_flag++; | |
1050 | break; | |
1051 | case 'k': | |
1052 | k_flag++; | |
1053 | break; | |
1054 | case 's': | |
1055 | if (c_flag) | |
1056 | usage(); | |
1057 | s_flag++; | |
1058 | break; | |
ffdb5d70 | 1059 | case 'd': |
1060 | if (d_flag) | |
1061 | usage(); | |
1062 | d_flag++; | |
1063 | break; | |
3e7efb37 | 1064 | case 'a': |
1065 | agentsocket = optarg; | |
1066 | break; | |
494b267f | 1067 | case 't': |
1068 | if ((lifetime = convtime(optarg)) == -1) { | |
1069 | fprintf(stderr, "Invalid lifetime\n"); | |
1070 | usage(); | |
1071 | } | |
1072 | break; | |
5260325f | 1073 | default: |
1074 | usage(); | |
1075 | } | |
dae3fa13 | 1076 | } |
5260325f | 1077 | ac -= optind; |
1078 | av += optind; | |
1079 | ||
ffdb5d70 | 1080 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
5260325f | 1081 | usage(); |
1082 | ||
b745a2f2 | 1083 | if (ac == 0 && !c_flag && !s_flag) { |
5260325f | 1084 | shell = getenv("SHELL"); |
cfaa5405 | 1085 | if (shell != NULL && |
1086 | strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
5260325f | 1087 | c_flag = 1; |
dae3fa13 | 1088 | } |
5260325f | 1089 | if (k_flag) { |
cfaa5405 | 1090 | const char *errstr = NULL; |
1091 | ||
5260325f | 1092 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
1093 | if (pidstr == NULL) { | |
1094 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
42f11eb2 | 1095 | SSH_AGENTPID_ENV_NAME); |
5260325f | 1096 | exit(1); |
1097 | } | |
cfaa5405 | 1098 | pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); |
1099 | if (errstr) { | |
1100 | fprintf(stderr, | |
1101 | "%s=\"%s\", which is not a good PID: %s\n", | |
1102 | SSH_AGENTPID_ENV_NAME, pidstr, errstr); | |
5260325f | 1103 | exit(1); |
1104 | } | |
1105 | if (kill(pid, SIGTERM) == -1) { | |
1106 | perror("kill"); | |
1107 | exit(1); | |
1108 | } | |
1109 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1110 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1111 | printf(format, SSH_AGENTPID_ENV_NAME); | |
c457707e | 1112 | printf("echo Agent pid %ld killed;\n", (long)pid); |
5260325f | 1113 | exit(0); |
dae3fa13 | 1114 | } |
5260325f | 1115 | parent_pid = getpid(); |
1116 | ||
3e7efb37 | 1117 | if (agentsocket == NULL) { |
1118 | /* Create private directory for agent socket */ | |
c88de854 | 1119 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir); |
3e7efb37 | 1120 | if (mkdtemp(socket_dir) == NULL) { |
1121 | perror("mkdtemp: private socket dir"); | |
1122 | exit(1); | |
1123 | } | |
c457707e | 1124 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
1125 | (long)parent_pid); | |
3e7efb37 | 1126 | } else { |
1127 | /* Try to use specified agent socket */ | |
1128 | socket_dir[0] = '\0'; | |
1129 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
5260325f | 1130 | } |
5260325f | 1131 | |
aa3378df | 1132 | /* |
1133 | * Create socket early so it will exist before command gets run from | |
1134 | * the parent. | |
1135 | */ | |
5260325f | 1136 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
1137 | if (sock < 0) { | |
1138 | perror("socket"); | |
8e8d8c82 | 1139 | *socket_name = '\0'; /* Don't unlink any existing file */ |
5260325f | 1140 | cleanup_exit(1); |
1141 | } | |
1142 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1143 | sunaddr.sun_family = AF_UNIX; | |
1144 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
c7ccfd39 | 1145 | prev_mask = umask(0177); |
32596c7b | 1146 | if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { |
5260325f | 1147 | perror("bind"); |
8e8d8c82 | 1148 | *socket_name = '\0'; /* Don't unlink any existing file */ |
c7ccfd39 | 1149 | umask(prev_mask); |
5260325f | 1150 | cleanup_exit(1); |
1151 | } | |
c7ccfd39 | 1152 | umask(prev_mask); |
fce39749 | 1153 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
5260325f | 1154 | perror("listen"); |
1155 | cleanup_exit(1); | |
dae3fa13 | 1156 | } |
42f11eb2 | 1157 | |
aa3378df | 1158 | /* |
1159 | * Fork, and have the parent execute the command, if any, or present | |
1160 | * the socket data. The child continues as the authentication agent. | |
1161 | */ | |
ffdb5d70 | 1162 | if (d_flag) { |
1163 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1164 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1165 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1166 | SSH_AUTHSOCKET_ENV_NAME); | |
c457707e | 1167 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
ffdb5d70 | 1168 | goto skip; |
1169 | } | |
5260325f | 1170 | pid = fork(); |
1171 | if (pid == -1) { | |
1172 | perror("fork"); | |
fccfbe3b | 1173 | cleanup_exit(1); |
dae3fa13 | 1174 | } |
5260325f | 1175 | if (pid != 0) { /* Parent - execute the given command. */ |
1176 | close(sock); | |
c457707e | 1177 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
5260325f | 1178 | if (ac == 0) { |
1179 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1180 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
42f11eb2 | 1181 | SSH_AUTHSOCKET_ENV_NAME); |
5260325f | 1182 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
42f11eb2 | 1183 | SSH_AGENTPID_ENV_NAME); |
c457707e | 1184 | printf("echo Agent pid %ld;\n", (long)pid); |
5260325f | 1185 | exit(0); |
1186 | } | |
bcbf86ec | 1187 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
1188 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1189 | perror("setenv"); | |
1190 | exit(1); | |
1191 | } | |
5260325f | 1192 | execvp(av[0], av); |
1193 | perror(av[0]); | |
1194 | exit(1); | |
1195 | } | |
fccfbe3b | 1196 | /* child */ |
1197 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
ec9f3450 | 1198 | |
1199 | if (setsid() == -1) { | |
fccfbe3b | 1200 | error("setsid: %s", strerror(errno)); |
ec9f3450 | 1201 | cleanup_exit(1); |
1202 | } | |
1203 | ||
1204 | (void)chdir("/"); | |
c4087616 | 1205 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
1206 | /* XXX might close listen socket */ | |
1207 | (void)dup2(fd, STDIN_FILENO); | |
1208 | (void)dup2(fd, STDOUT_FILENO); | |
1209 | (void)dup2(fd, STDERR_FILENO); | |
1210 | if (fd > 2) | |
1211 | close(fd); | |
1212 | } | |
dae3fa13 | 1213 | |
b03bd394 | 1214 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1215 | /* deny core dumps, since memory contains unencrypted private keys */ |
1216 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1217 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
fccfbe3b | 1218 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
0b6fbf03 | 1219 | cleanup_exit(1); |
1220 | } | |
b03bd394 | 1221 | #endif |
ffdb5d70 | 1222 | |
1223 | skip: | |
5260325f | 1224 | new_socket(AUTH_SOCKET, sock); |
1225 | if (ac > 0) { | |
8d9bb5dd | 1226 | mysignal(SIGALRM, check_parent_exists); |
5260325f | 1227 | alarm(10); |
1228 | } | |
2e73a022 | 1229 | idtab_init(); |
1ee482c5 | 1230 | if (!d_flag) |
ffdb5d70 | 1231 | signal(SIGINT, SIG_IGN); |
1ee482c5 | 1232 | signal(SIGPIPE, SIG_IGN); |
2f4b2e38 | 1233 | signal(SIGHUP, cleanup_handler); |
1234 | signal(SIGTERM, cleanup_handler); | |
e364646f | 1235 | nalloc = 0; |
1236 | ||
5260325f | 1237 | while (1) { |
e364646f | 1238 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); |
42f11eb2 | 1239 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { |
5260325f | 1240 | if (errno == EINTR) |
1241 | continue; | |
fccfbe3b | 1242 | fatal("select: %s", strerror(errno)); |
5260325f | 1243 | } |
42f11eb2 | 1244 | after_select(readsetp, writesetp); |
8efc0c15 | 1245 | } |
5260325f | 1246 | /* NOTREACHED */ |
8efc0c15 | 1247 | } |