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028094f4 | 1 | /* $OpenBSD: ssh-agent.c,v 1.143 2006/07/11 20:07:25 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> |
54 | ||
42f11eb2 | 55 | #include <openssl/evp.h> |
56 | #include <openssl/md5.h> | |
8efc0c15 | 57 | |
58 | #include "ssh.h" | |
59 | #include "rsa.h" | |
8efc0c15 | 60 | #include "buffer.h" |
61 | #include "bufaux.h" | |
62 | #include "xmalloc.h" | |
4c8722d9 | 63 | #include "key.h" |
64 | #include "authfd.h" | |
188adeb2 | 65 | #include "compat.h" |
42f11eb2 | 66 | #include "log.h" |
c4087616 | 67 | #include "misc.h" |
8efc0c15 | 68 | |
2b5fe3b8 | 69 | #ifdef SMARTCARD |
2b5fe3b8 | 70 | #include "scard.h" |
dd2495cb | 71 | #endif |
2b5fe3b8 | 72 | |
e7f6070d | 73 | #if defined(HAVE_SYS_PRCTL_H) |
74 | #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ | |
75 | #endif | |
76 | ||
17a3011c | 77 | typedef enum { |
78 | AUTH_UNUSED, | |
79 | AUTH_SOCKET, | |
80 | AUTH_CONNECTION | |
81 | } sock_type; | |
82 | ||
5260325f | 83 | typedef struct { |
84 | int fd; | |
17a3011c | 85 | sock_type type; |
5260325f | 86 | Buffer input; |
87 | Buffer output; | |
b9dd5ca1 | 88 | Buffer request; |
8efc0c15 | 89 | } SocketEntry; |
90 | ||
1e3b8b07 | 91 | u_int sockets_alloc = 0; |
8efc0c15 | 92 | SocketEntry *sockets = NULL; |
93 | ||
95f0a918 | 94 | typedef struct identity { |
95 | TAILQ_ENTRY(identity) next; | |
2e73a022 | 96 | Key *key; |
5260325f | 97 | char *comment; |
264572cc | 98 | u_int death; |
c4087616 | 99 | u_int confirm; |
8efc0c15 | 100 | } Identity; |
101 | ||
2e73a022 | 102 | typedef struct { |
103 | int nentries; | |
95f0a918 | 104 | TAILQ_HEAD(idqueue, identity) idlist; |
2e73a022 | 105 | } Idtab; |
106 | ||
107 | /* private key table, one per protocol version */ | |
108 | Idtab idtable[3]; | |
8efc0c15 | 109 | |
110 | int max_fd = 0; | |
111 | ||
112 | /* pid of shell == parent of agent */ | |
9da5c3c9 | 113 | pid_t parent_pid = -1; |
8efc0c15 | 114 | |
115 | /* pathname and directory for AUTH_SOCKET */ | |
52e3daed | 116 | char socket_name[MAXPATHLEN]; |
117 | char socket_dir[MAXPATHLEN]; | |
8efc0c15 | 118 | |
3db7f994 | 119 | /* locking */ |
120 | int locked = 0; | |
121 | char *lock_passwd = NULL; | |
122 | ||
5260325f | 123 | extern char *__progname; |
5260325f | 124 | |
494b267f | 125 | /* Default lifetime (0 == forever) */ |
126 | static int lifetime = 0; | |
127 | ||
c1a4eef1 | 128 | static void |
129 | close_socket(SocketEntry *e) | |
130 | { | |
c1a4eef1 | 131 | close(e->fd); |
132 | e->fd = -1; | |
133 | e->type = AUTH_UNUSED; | |
134 | buffer_free(&e->input); | |
135 | buffer_free(&e->output); | |
136 | buffer_free(&e->request); | |
137 | } | |
138 | ||
396c147e | 139 | static void |
2e73a022 | 140 | idtab_init(void) |
141 | { | |
142 | int i; | |
e424e241 | 143 | |
6aacefa7 | 144 | for (i = 0; i <=2; i++) { |
95f0a918 | 145 | TAILQ_INIT(&idtable[i].idlist); |
2e73a022 | 146 | idtable[i].nentries = 0; |
147 | } | |
148 | } | |
149 | ||
150 | /* return private key table for requested protocol version */ | |
396c147e | 151 | static Idtab * |
2e73a022 | 152 | idtab_lookup(int version) |
153 | { | |
154 | if (version < 1 || version > 2) | |
155 | fatal("internal error, bad protocol version %d", version); | |
156 | return &idtable[version]; | |
157 | } | |
158 | ||
264572cc | 159 | static void |
160 | free_identity(Identity *id) | |
161 | { | |
162 | key_free(id->key); | |
163 | xfree(id->comment); | |
164 | xfree(id); | |
165 | } | |
166 | ||
2e73a022 | 167 | /* return matching private key for given public key */ |
95f0a918 | 168 | static Identity * |
169 | lookup_identity(Key *key, int version) | |
2e73a022 | 170 | { |
95f0a918 | 171 | Identity *id; |
172 | ||
2e73a022 | 173 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 174 | TAILQ_FOREACH(id, &tab->idlist, next) { |
175 | if (key_equal(key, id->key)) | |
176 | return (id); | |
2e73a022 | 177 | } |
95f0a918 | 178 | return (NULL); |
179 | } | |
180 | ||
c4087616 | 181 | /* Check confirmation of keysign request */ |
182 | static int | |
183 | confirm_key(Identity *id) | |
184 | { | |
7a9c7a0b | 185 | char *p; |
c4087616 | 186 | int ret = -1; |
187 | ||
188 | p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); | |
7a9c7a0b | 189 | if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", |
190 | id->comment, p)) | |
191 | ret = 0; | |
c4087616 | 192 | xfree(p); |
7a9c7a0b | 193 | |
c4087616 | 194 | return (ret); |
195 | } | |
196 | ||
2e73a022 | 197 | /* send list of supported public keys to 'client' */ |
396c147e | 198 | static void |
2e73a022 | 199 | process_request_identities(SocketEntry *e, int version) |
8efc0c15 | 200 | { |
2e73a022 | 201 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 202 | Identity *id; |
e424e241 | 203 | Buffer msg; |
5260325f | 204 | |
205 | buffer_init(&msg); | |
2e73a022 | 206 | buffer_put_char(&msg, (version == 1) ? |
207 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
208 | buffer_put_int(&msg, tab->nentries); | |
95f0a918 | 209 | TAILQ_FOREACH(id, &tab->idlist, next) { |
fa08c86b | 210 | if (id->key->type == KEY_RSA1) { |
2e73a022 | 211 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
212 | buffer_put_bignum(&msg, id->key->rsa->e); | |
213 | buffer_put_bignum(&msg, id->key->rsa->n); | |
214 | } else { | |
1e3b8b07 | 215 | u_char *blob; |
216 | u_int blen; | |
fa08c86b | 217 | key_to_blob(id->key, &blob, &blen); |
2e73a022 | 218 | buffer_put_string(&msg, blob, blen); |
219 | xfree(blob); | |
220 | } | |
221 | buffer_put_cstring(&msg, id->comment); | |
5260325f | 222 | } |
223 | buffer_put_int(&e->output, buffer_len(&msg)); | |
224 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
225 | buffer_free(&msg); | |
8efc0c15 | 226 | } |
227 | ||
2e73a022 | 228 | /* ssh1 only */ |
396c147e | 229 | static void |
2e73a022 | 230 | process_authentication_challenge1(SocketEntry *e) |
8efc0c15 | 231 | { |
e424e241 | 232 | u_char buf[32], mdbuf[16], session_id[16]; |
233 | u_int response_type; | |
2e73a022 | 234 | BIGNUM *challenge; |
e424e241 | 235 | Identity *id; |
2e73a022 | 236 | int i, len; |
5260325f | 237 | Buffer msg; |
238 | MD5_CTX md; | |
e424e241 | 239 | Key *key; |
5260325f | 240 | |
241 | buffer_init(&msg); | |
fa08c86b | 242 | key = key_new(KEY_RSA1); |
b775c6f2 | 243 | if ((challenge = BN_new()) == NULL) |
244 | fatal("process_authentication_challenge1: BN_new failed"); | |
5260325f | 245 | |
1169c3df | 246 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 247 | buffer_get_bignum(&e->request, key->rsa->e); |
248 | buffer_get_bignum(&e->request, key->rsa->n); | |
249 | buffer_get_bignum(&e->request, challenge); | |
5260325f | 250 | |
2e73a022 | 251 | /* Only protocol 1.1 is supported */ |
b9dd5ca1 | 252 | if (buffer_len(&e->request) == 0) |
2e73a022 | 253 | goto failure; |
b9dd5ca1 | 254 | buffer_get(&e->request, session_id, 16); |
255 | response_type = buffer_get_int(&e->request); | |
2e73a022 | 256 | if (response_type != 1) |
257 | goto failure; | |
258 | ||
95f0a918 | 259 | id = lookup_identity(key, 1); |
c4087616 | 260 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { |
95f0a918 | 261 | Key *private = id->key; |
2e73a022 | 262 | /* Decrypt the challenge using the private key. */ |
46aa2d1f | 263 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
264 | goto failure; | |
2e73a022 | 265 | |
266 | /* The response is MD5 of decrypted challenge plus session id. */ | |
267 | len = BN_num_bytes(challenge); | |
268 | if (len <= 0 || len > 32) { | |
bbe88b6d | 269 | logit("process_authentication_challenge: bad challenge length %d", len); |
2e73a022 | 270 | goto failure; |
5260325f | 271 | } |
2e73a022 | 272 | memset(buf, 0, 32); |
273 | BN_bn2bin(challenge, buf + 32 - len); | |
274 | MD5_Init(&md); | |
275 | MD5_Update(&md, buf, 32); | |
276 | MD5_Update(&md, session_id, 16); | |
277 | MD5_Final(mdbuf, &md); | |
278 | ||
279 | /* Send the response. */ | |
280 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
281 | for (i = 0; i < 16; i++) | |
282 | buffer_put_char(&msg, mdbuf[i]); | |
283 | goto send; | |
284 | } | |
285 | ||
286 | failure: | |
287 | /* Unknown identity or protocol error. Send failure. */ | |
5260325f | 288 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
289 | send: | |
2e73a022 | 290 | buffer_put_int(&e->output, buffer_len(&msg)); |
291 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
292 | key_free(key); | |
293 | BN_clear_free(challenge); | |
294 | buffer_free(&msg); | |
295 | } | |
296 | ||
297 | /* ssh2 only */ | |
396c147e | 298 | static void |
2e73a022 | 299 | process_sign_request2(SocketEntry *e) |
300 | { | |
1e3b8b07 | 301 | u_char *blob, *data, *signature = NULL; |
302 | u_int blen, dlen, slen = 0; | |
e424e241 | 303 | extern int datafellows; |
304 | int ok = -1, flags; | |
2e73a022 | 305 | Buffer msg; |
e424e241 | 306 | Key *key; |
2e73a022 | 307 | |
308 | datafellows = 0; | |
227e8e86 | 309 | |
b9dd5ca1 | 310 | blob = buffer_get_string(&e->request, &blen); |
311 | data = buffer_get_string(&e->request, &dlen); | |
188adeb2 | 312 | |
b9dd5ca1 | 313 | flags = buffer_get_int(&e->request); |
188adeb2 | 314 | if (flags & SSH_AGENT_OLD_SIGNATURE) |
315 | datafellows = SSH_BUG_SIGBLOB; | |
2e73a022 | 316 | |
fa08c86b | 317 | key = key_from_blob(blob, blen); |
2e73a022 | 318 | if (key != NULL) { |
95f0a918 | 319 | Identity *id = lookup_identity(key, 2); |
c4087616 | 320 | if (id != NULL && (!id->confirm || confirm_key(id) == 0)) |
95f0a918 | 321 | ok = key_sign(id->key, &signature, &slen, data, dlen); |
2b8dc5e3 | 322 | key_free(key); |
2e73a022 | 323 | } |
2e73a022 | 324 | buffer_init(&msg); |
325 | if (ok == 0) { | |
326 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
327 | buffer_put_string(&msg, signature, slen); | |
328 | } else { | |
329 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
330 | } | |
5260325f | 331 | buffer_put_int(&e->output, buffer_len(&msg)); |
332 | buffer_append(&e->output, buffer_ptr(&msg), | |
2e73a022 | 333 | buffer_len(&msg)); |
5260325f | 334 | buffer_free(&msg); |
2e73a022 | 335 | xfree(data); |
336 | xfree(blob); | |
337 | if (signature != NULL) | |
338 | xfree(signature); | |
8efc0c15 | 339 | } |
340 | ||
2e73a022 | 341 | /* shared */ |
396c147e | 342 | static void |
2e73a022 | 343 | process_remove_identity(SocketEntry *e, int version) |
8efc0c15 | 344 | { |
e424e241 | 345 | u_int blen, bits; |
346 | int success = 0; | |
95f0a918 | 347 | Key *key = NULL; |
1e3b8b07 | 348 | u_char *blob; |
2e73a022 | 349 | |
6aacefa7 | 350 | switch (version) { |
2e73a022 | 351 | case 1: |
fa08c86b | 352 | key = key_new(KEY_RSA1); |
b9dd5ca1 | 353 | bits = buffer_get_int(&e->request); |
354 | buffer_get_bignum(&e->request, key->rsa->e); | |
355 | buffer_get_bignum(&e->request, key->rsa->n); | |
2e73a022 | 356 | |
357 | if (bits != key_size(key)) | |
bbe88b6d | 358 | logit("Warning: identity keysize mismatch: actual %u, announced %u", |
42f11eb2 | 359 | key_size(key), bits); |
2e73a022 | 360 | break; |
361 | case 2: | |
b9dd5ca1 | 362 | blob = buffer_get_string(&e->request, &blen); |
fa08c86b | 363 | key = key_from_blob(blob, blen); |
2e73a022 | 364 | xfree(blob); |
365 | break; | |
366 | } | |
367 | if (key != NULL) { | |
95f0a918 | 368 | Identity *id = lookup_identity(key, version); |
369 | if (id != NULL) { | |
aa3378df | 370 | /* |
371 | * We have this key. Free the old key. Since we | |
7b9b0103 | 372 | * don't want to leave empty slots in the middle of |
d343d900 | 373 | * the array, we actually free the key there and move |
374 | * all the entries between the empty slot and the end | |
375 | * of the array. | |
aa3378df | 376 | */ |
2e73a022 | 377 | Idtab *tab = idtab_lookup(version); |
fa08c86b | 378 | if (tab->nentries < 1) |
379 | fatal("process_remove_identity: " | |
380 | "internal error: tab->nentries %d", | |
381 | tab->nentries); | |
95f0a918 | 382 | TAILQ_REMOVE(&tab->idlist, id, next); |
383 | free_identity(id); | |
2e73a022 | 384 | tab->nentries--; |
385 | success = 1; | |
5260325f | 386 | } |
2e73a022 | 387 | key_free(key); |
388 | } | |
8efc0c15 | 389 | buffer_put_int(&e->output, 1); |
2e73a022 | 390 | buffer_put_char(&e->output, |
391 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 392 | } |
393 | ||
396c147e | 394 | static void |
2e73a022 | 395 | process_remove_all_identities(SocketEntry *e, int version) |
8efc0c15 | 396 | { |
2e73a022 | 397 | Idtab *tab = idtab_lookup(version); |
95f0a918 | 398 | Identity *id; |
8efc0c15 | 399 | |
5260325f | 400 | /* Loop over all identities and clear the keys. */ |
95f0a918 | 401 | for (id = TAILQ_FIRST(&tab->idlist); id; |
402 | id = TAILQ_FIRST(&tab->idlist)) { | |
403 | TAILQ_REMOVE(&tab->idlist, id, next); | |
404 | free_identity(id); | |
5260325f | 405 | } |
8efc0c15 | 406 | |
5260325f | 407 | /* Mark that there are no identities. */ |
2e73a022 | 408 | tab->nentries = 0; |
8efc0c15 | 409 | |
410 | /* Send success. */ | |
411 | buffer_put_int(&e->output, 1); | |
412 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
5260325f | 413 | } |
414 | ||
264572cc | 415 | static void |
416 | reaper(void) | |
417 | { | |
e424e241 | 418 | u_int now = time(NULL); |
264572cc | 419 | Identity *id, *nxt; |
420 | int version; | |
e424e241 | 421 | Idtab *tab; |
264572cc | 422 | |
423 | for (version = 1; version < 3; version++) { | |
424 | tab = idtab_lookup(version); | |
425 | for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { | |
426 | nxt = TAILQ_NEXT(id, next); | |
427 | if (id->death != 0 && now >= id->death) { | |
428 | TAILQ_REMOVE(&tab->idlist, id, next); | |
429 | free_identity(id); | |
430 | tab->nentries--; | |
431 | } | |
432 | } | |
433 | } | |
434 | } | |
435 | ||
396c147e | 436 | static void |
fa08c86b | 437 | process_add_identity(SocketEntry *e, int version) |
438 | { | |
2e73a022 | 439 | Idtab *tab = idtab_lookup(version); |
c4087616 | 440 | int type, success = 0, death = 0, confirm = 0; |
e424e241 | 441 | char *type_name, *comment; |
442 | Key *k = NULL; | |
5260325f | 443 | |
2e73a022 | 444 | switch (version) { |
445 | case 1: | |
fa08c86b | 446 | k = key_new_private(KEY_RSA1); |
1169c3df | 447 | (void) buffer_get_int(&e->request); /* ignored */ |
b9dd5ca1 | 448 | buffer_get_bignum(&e->request, k->rsa->n); |
449 | buffer_get_bignum(&e->request, k->rsa->e); | |
450 | buffer_get_bignum(&e->request, k->rsa->d); | |
451 | buffer_get_bignum(&e->request, k->rsa->iqmp); | |
2e73a022 | 452 | |
453 | /* SSH and SSL have p and q swapped */ | |
b9dd5ca1 | 454 | buffer_get_bignum(&e->request, k->rsa->q); /* p */ |
455 | buffer_get_bignum(&e->request, k->rsa->p); /* q */ | |
2e73a022 | 456 | |
457 | /* Generate additional parameters */ | |
2b63e803 | 458 | rsa_generate_additional_parameters(k->rsa); |
2e73a022 | 459 | break; |
460 | case 2: | |
b9dd5ca1 | 461 | type_name = buffer_get_string(&e->request, NULL); |
42f11eb2 | 462 | type = key_type_from_name(type_name); |
fa08c86b | 463 | xfree(type_name); |
6aacefa7 | 464 | switch (type) { |
fa08c86b | 465 | case KEY_DSA: |
466 | k = key_new_private(type); | |
b9dd5ca1 | 467 | buffer_get_bignum2(&e->request, k->dsa->p); |
468 | buffer_get_bignum2(&e->request, k->dsa->q); | |
469 | buffer_get_bignum2(&e->request, k->dsa->g); | |
470 | buffer_get_bignum2(&e->request, k->dsa->pub_key); | |
471 | buffer_get_bignum2(&e->request, k->dsa->priv_key); | |
fa08c86b | 472 | break; |
473 | case KEY_RSA: | |
474 | k = key_new_private(type); | |
b9dd5ca1 | 475 | buffer_get_bignum2(&e->request, k->rsa->n); |
476 | buffer_get_bignum2(&e->request, k->rsa->e); | |
477 | buffer_get_bignum2(&e->request, k->rsa->d); | |
478 | buffer_get_bignum2(&e->request, k->rsa->iqmp); | |
479 | buffer_get_bignum2(&e->request, k->rsa->p); | |
480 | buffer_get_bignum2(&e->request, k->rsa->q); | |
fa08c86b | 481 | |
482 | /* Generate additional parameters */ | |
2b63e803 | 483 | rsa_generate_additional_parameters(k->rsa); |
fa08c86b | 484 | break; |
485 | default: | |
b9dd5ca1 | 486 | buffer_clear(&e->request); |
2e73a022 | 487 | goto send; |
5260325f | 488 | } |
2e73a022 | 489 | break; |
490 | } | |
cb0e1d67 | 491 | /* enable blinding */ |
492 | switch (k->type) { | |
493 | case KEY_RSA: | |
494 | case KEY_RSA1: | |
495 | if (RSA_blinding_on(k->rsa, NULL) != 1) { | |
496 | error("process_add_identity: RSA_blinding_on failed"); | |
497 | key_free(k); | |
498 | goto send; | |
499 | } | |
500 | break; | |
501 | } | |
b9dd5ca1 | 502 | comment = buffer_get_string(&e->request, NULL); |
2e73a022 | 503 | if (k == NULL) { |
504 | xfree(comment); | |
505 | goto send; | |
506 | } | |
507 | success = 1; | |
ee900f87 | 508 | while (buffer_len(&e->request)) { |
509 | switch (buffer_get_char(&e->request)) { | |
510 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
511 | death = time(NULL) + buffer_get_int(&e->request); | |
512 | break; | |
c4087616 | 513 | case SSH_AGENT_CONSTRAIN_CONFIRM: |
514 | confirm = 1; | |
515 | break; | |
ee900f87 | 516 | default: |
517 | break; | |
518 | } | |
519 | } | |
494b267f | 520 | if (lifetime && !death) |
521 | death = time(NULL) + lifetime; | |
95f0a918 | 522 | if (lookup_identity(k, version) == NULL) { |
523 | Identity *id = xmalloc(sizeof(Identity)); | |
524 | id->key = k; | |
525 | id->comment = comment; | |
ee900f87 | 526 | id->death = death; |
c4087616 | 527 | id->confirm = confirm; |
95f0a918 | 528 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
2e73a022 | 529 | /* Increment the number of identities. */ |
530 | tab->nentries++; | |
531 | } else { | |
532 | key_free(k); | |
533 | xfree(comment); | |
534 | } | |
535 | send: | |
5260325f | 536 | buffer_put_int(&e->output, 1); |
2e73a022 | 537 | buffer_put_char(&e->output, |
538 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 539 | } |
540 | ||
3db7f994 | 541 | /* XXX todo: encrypt sensitive data with passphrase */ |
542 | static void | |
543 | process_lock_agent(SocketEntry *e, int lock) | |
544 | { | |
3db7f994 | 545 | int success = 0; |
e424e241 | 546 | char *passwd; |
3db7f994 | 547 | |
548 | passwd = buffer_get_string(&e->request, NULL); | |
549 | if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { | |
550 | locked = 0; | |
551 | memset(lock_passwd, 0, strlen(lock_passwd)); | |
552 | xfree(lock_passwd); | |
553 | lock_passwd = NULL; | |
554 | success = 1; | |
555 | } else if (!locked && lock) { | |
556 | locked = 1; | |
557 | lock_passwd = xstrdup(passwd); | |
558 | success = 1; | |
559 | } | |
560 | memset(passwd, 0, strlen(passwd)); | |
561 | xfree(passwd); | |
7203d6bb | 562 | |
3db7f994 | 563 | buffer_put_int(&e->output, 1); |
564 | buffer_put_char(&e->output, | |
565 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
3db7f994 | 566 | } |
567 | ||
568 | static void | |
569 | no_identities(SocketEntry *e, u_int type) | |
570 | { | |
571 | Buffer msg; | |
572 | ||
573 | buffer_init(&msg); | |
574 | buffer_put_char(&msg, | |
575 | (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? | |
576 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
577 | buffer_put_int(&msg, 0); | |
578 | buffer_put_int(&e->output, buffer_len(&msg)); | |
579 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
580 | buffer_free(&msg); | |
581 | } | |
2b5fe3b8 | 582 | |
583 | #ifdef SMARTCARD | |
584 | static void | |
585 | process_add_smartcard_key (SocketEntry *e) | |
586 | { | |
76139bd8 | 587 | char *sc_reader_id = NULL, *pin; |
ca719034 | 588 | int i, version, success = 0, death = 0, confirm = 0; |
e424e241 | 589 | Key **keys, *k; |
590 | Identity *id; | |
591 | Idtab *tab; | |
184eed6a | 592 | |
b9dd5ca1 | 593 | sc_reader_id = buffer_get_string(&e->request, NULL); |
594 | pin = buffer_get_string(&e->request, NULL); | |
ca719034 | 595 | |
596 | while (buffer_len(&e->request)) { | |
597 | switch (buffer_get_char(&e->request)) { | |
598 | case SSH_AGENT_CONSTRAIN_LIFETIME: | |
599 | death = time(NULL) + buffer_get_int(&e->request); | |
600 | break; | |
601 | case SSH_AGENT_CONSTRAIN_CONFIRM: | |
602 | confirm = 1; | |
603 | break; | |
604 | default: | |
605 | break; | |
606 | } | |
607 | } | |
608 | if (lifetime && !death) | |
609 | death = time(NULL) + lifetime; | |
610 | ||
0659cace | 611 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 612 | xfree(sc_reader_id); |
76139bd8 | 613 | xfree(pin); |
2b5fe3b8 | 614 | |
0659cace | 615 | if (keys == NULL || keys[0] == NULL) { |
616 | error("sc_get_keys failed"); | |
2b5fe3b8 | 617 | goto send; |
618 | } | |
0659cace | 619 | for (i = 0; keys[i] != NULL; i++) { |
620 | k = keys[i]; | |
621 | version = k->type == KEY_RSA1 ? 1 : 2; | |
622 | tab = idtab_lookup(version); | |
623 | if (lookup_identity(k, version) == NULL) { | |
624 | id = xmalloc(sizeof(Identity)); | |
625 | id->key = k; | |
244e796f | 626 | id->comment = sc_get_key_label(k); |
ca719034 | 627 | id->death = death; |
628 | id->confirm = confirm; | |
0659cace | 629 | TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
630 | tab->nentries++; | |
631 | success = 1; | |
632 | } else { | |
633 | key_free(k); | |
634 | } | |
635 | keys[i] = NULL; | |
2b5fe3b8 | 636 | } |
0659cace | 637 | xfree(keys); |
2b5fe3b8 | 638 | send: |
639 | buffer_put_int(&e->output, 1); | |
640 | buffer_put_char(&e->output, | |
641 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
642 | } | |
643 | ||
644 | static void | |
645 | process_remove_smartcard_key(SocketEntry *e) | |
646 | { | |
76139bd8 | 647 | char *sc_reader_id = NULL, *pin; |
0659cace | 648 | int i, version, success = 0; |
e424e241 | 649 | Key **keys, *k = NULL; |
650 | Identity *id; | |
651 | Idtab *tab; | |
2b5fe3b8 | 652 | |
b9dd5ca1 | 653 | sc_reader_id = buffer_get_string(&e->request, NULL); |
654 | pin = buffer_get_string(&e->request, NULL); | |
0659cace | 655 | keys = sc_get_keys(sc_reader_id, pin); |
9ff6f66f | 656 | xfree(sc_reader_id); |
76139bd8 | 657 | xfree(pin); |
2b5fe3b8 | 658 | |
0659cace | 659 | if (keys == NULL || keys[0] == NULL) { |
660 | error("sc_get_keys failed"); | |
661 | goto send; | |
662 | } | |
663 | for (i = 0; keys[i] != NULL; i++) { | |
664 | k = keys[i]; | |
665 | version = k->type == KEY_RSA1 ? 1 : 2; | |
666 | if ((id = lookup_identity(k, version)) != NULL) { | |
667 | tab = idtab_lookup(version); | |
875ec275 | 668 | TAILQ_REMOVE(&tab->idlist, id, next); |
2b5fe3b8 | 669 | tab->nentries--; |
95f0a918 | 670 | free_identity(id); |
2b5fe3b8 | 671 | success = 1; |
672 | } | |
673 | key_free(k); | |
0659cace | 674 | keys[i] = NULL; |
2b5fe3b8 | 675 | } |
0659cace | 676 | xfree(keys); |
677 | send: | |
2b5fe3b8 | 678 | buffer_put_int(&e->output, 1); |
679 | buffer_put_char(&e->output, | |
680 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
681 | } | |
3e984472 | 682 | #endif /* SMARTCARD */ |
2b5fe3b8 | 683 | |
2e73a022 | 684 | /* dispatch incoming messages */ |
685 | ||
396c147e | 686 | static void |
8efc0c15 | 687 | process_message(SocketEntry *e) |
688 | { | |
e424e241 | 689 | u_int msg_len, type; |
1e3b8b07 | 690 | u_char *cp; |
264572cc | 691 | |
692 | /* kill dead keys */ | |
693 | reaper(); | |
694 | ||
5260325f | 695 | if (buffer_len(&e->input) < 5) |
696 | return; /* Incomplete message. */ | |
20905a8e | 697 | cp = buffer_ptr(&e->input); |
51e7a012 | 698 | msg_len = get_u32(cp); |
5260325f | 699 | if (msg_len > 256 * 1024) { |
c1a4eef1 | 700 | close_socket(e); |
5260325f | 701 | return; |
702 | } | |
703 | if (buffer_len(&e->input) < msg_len + 4) | |
704 | return; | |
b9dd5ca1 | 705 | |
706 | /* move the current input to e->request */ | |
5260325f | 707 | buffer_consume(&e->input, 4); |
b9dd5ca1 | 708 | buffer_clear(&e->request); |
709 | buffer_append(&e->request, buffer_ptr(&e->input), msg_len); | |
710 | buffer_consume(&e->input, msg_len); | |
711 | type = buffer_get_char(&e->request); | |
5260325f | 712 | |
3db7f994 | 713 | /* check wheter agent is locked */ |
714 | if (locked && type != SSH_AGENTC_UNLOCK) { | |
715 | buffer_clear(&e->request); | |
716 | switch (type) { | |
717 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
718 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
719 | /* send empty lists */ | |
720 | no_identities(e, type); | |
721 | break; | |
722 | default: | |
723 | /* send a fail message for all other request types */ | |
724 | buffer_put_int(&e->output, 1); | |
725 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
726 | } | |
727 | return; | |
728 | } | |
729 | ||
2b5fe3b8 | 730 | debug("type %d", type); |
5260325f | 731 | switch (type) { |
3db7f994 | 732 | case SSH_AGENTC_LOCK: |
733 | case SSH_AGENTC_UNLOCK: | |
734 | process_lock_agent(e, type == SSH_AGENTC_LOCK); | |
735 | break; | |
2e73a022 | 736 | /* ssh1 */ |
5260325f | 737 | case SSH_AGENTC_RSA_CHALLENGE: |
2e73a022 | 738 | process_authentication_challenge1(e); |
739 | break; | |
740 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
741 | process_request_identities(e, 1); | |
5260325f | 742 | break; |
743 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
ee900f87 | 744 | case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: |
2e73a022 | 745 | process_add_identity(e, 1); |
5260325f | 746 | break; |
747 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
2e73a022 | 748 | process_remove_identity(e, 1); |
5260325f | 749 | break; |
750 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
2e73a022 | 751 | process_remove_all_identities(e, 1); |
752 | break; | |
753 | /* ssh2 */ | |
754 | case SSH2_AGENTC_SIGN_REQUEST: | |
755 | process_sign_request2(e); | |
756 | break; | |
757 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
758 | process_request_identities(e, 2); | |
759 | break; | |
760 | case SSH2_AGENTC_ADD_IDENTITY: | |
ee900f87 | 761 | case SSH2_AGENTC_ADD_ID_CONSTRAINED: |
2e73a022 | 762 | process_add_identity(e, 2); |
763 | break; | |
764 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
765 | process_remove_identity(e, 2); | |
766 | break; | |
767 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
768 | process_remove_all_identities(e, 2); | |
5260325f | 769 | break; |
2b5fe3b8 | 770 | #ifdef SMARTCARD |
771 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
ca719034 | 772 | case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: |
2b5fe3b8 | 773 | process_add_smartcard_key(e); |
184eed6a | 774 | break; |
2b5fe3b8 | 775 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
776 | process_remove_smartcard_key(e); | |
184eed6a | 777 | break; |
3e984472 | 778 | #endif /* SMARTCARD */ |
5260325f | 779 | default: |
780 | /* Unknown message. Respond with failure. */ | |
781 | error("Unknown message %d", type); | |
b9dd5ca1 | 782 | buffer_clear(&e->request); |
5260325f | 783 | buffer_put_int(&e->output, 1); |
784 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
785 | break; | |
786 | } | |
8efc0c15 | 787 | } |
788 | ||
396c147e | 789 | static void |
17a3011c | 790 | new_socket(sock_type type, int fd) |
8efc0c15 | 791 | { |
c46e584f | 792 | u_int i, old_alloc, new_alloc; |
e424e241 | 793 | |
170694d7 | 794 | set_nonblock(fd); |
5260325f | 795 | |
796 | if (fd > max_fd) | |
797 | max_fd = fd; | |
798 | ||
799 | for (i = 0; i < sockets_alloc; i++) | |
800 | if (sockets[i].type == AUTH_UNUSED) { | |
801 | sockets[i].fd = fd; | |
5260325f | 802 | buffer_init(&sockets[i].input); |
803 | buffer_init(&sockets[i].output); | |
b9dd5ca1 | 804 | buffer_init(&sockets[i].request); |
c46e584f | 805 | sockets[i].type = type; |
5260325f | 806 | return; |
807 | } | |
808 | old_alloc = sockets_alloc; | |
c46e584f | 809 | new_alloc = sockets_alloc + 10; |
c5d10563 | 810 | sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); |
c46e584f | 811 | for (i = old_alloc; i < new_alloc; i++) |
5260325f | 812 | sockets[i].type = AUTH_UNUSED; |
c46e584f | 813 | sockets_alloc = new_alloc; |
5260325f | 814 | sockets[old_alloc].fd = fd; |
815 | buffer_init(&sockets[old_alloc].input); | |
816 | buffer_init(&sockets[old_alloc].output); | |
b9dd5ca1 | 817 | buffer_init(&sockets[old_alloc].request); |
c46e584f | 818 | sockets[old_alloc].type = type; |
8efc0c15 | 819 | } |
820 | ||
396c147e | 821 | static int |
9a995072 | 822 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp) |
8efc0c15 | 823 | { |
42f11eb2 | 824 | u_int i, sz; |
825 | int n = 0; | |
826 | ||
827 | for (i = 0; i < sockets_alloc; i++) { | |
5260325f | 828 | switch (sockets[i].type) { |
829 | case AUTH_SOCKET: | |
830 | case AUTH_CONNECTION: | |
42f11eb2 | 831 | n = MAX(n, sockets[i].fd); |
5260325f | 832 | break; |
833 | case AUTH_UNUSED: | |
834 | break; | |
835 | default: | |
836 | fatal("Unknown socket type %d", sockets[i].type); | |
837 | break; | |
838 | } | |
42f11eb2 | 839 | } |
840 | ||
841 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
e364646f | 842 | if (*fdrp == NULL || sz > *nallocp) { |
42f11eb2 | 843 | if (*fdrp) |
894c5fa6 | 844 | xfree(*fdrp); |
42f11eb2 | 845 | if (*fdwp) |
894c5fa6 | 846 | xfree(*fdwp); |
42f11eb2 | 847 | *fdrp = xmalloc(sz); |
848 | *fdwp = xmalloc(sz); | |
e364646f | 849 | *nallocp = sz; |
42f11eb2 | 850 | } |
e364646f | 851 | if (n < *fdl) |
852 | debug("XXX shrink: %d < %d", n, *fdl); | |
853 | *fdl = n; | |
42f11eb2 | 854 | memset(*fdrp, 0, sz); |
855 | memset(*fdwp, 0, sz); | |
856 | ||
857 | for (i = 0; i < sockets_alloc; i++) { | |
858 | switch (sockets[i].type) { | |
859 | case AUTH_SOCKET: | |
860 | case AUTH_CONNECTION: | |
861 | FD_SET(sockets[i].fd, *fdrp); | |
862 | if (buffer_len(&sockets[i].output) > 0) | |
863 | FD_SET(sockets[i].fd, *fdwp); | |
864 | break; | |
865 | default: | |
866 | break; | |
867 | } | |
868 | } | |
869 | return (1); | |
8efc0c15 | 870 | } |
871 | ||
396c147e | 872 | static void |
5260325f | 873 | after_select(fd_set *readset, fd_set *writeset) |
8efc0c15 | 874 | { |
e424e241 | 875 | struct sockaddr_un sunaddr; |
610cd5c6 | 876 | socklen_t slen; |
5260325f | 877 | char buf[1024]; |
e424e241 | 878 | int len, sock; |
879 | u_int i; | |
87f4111f | 880 | uid_t euid; |
881 | gid_t egid; | |
5260325f | 882 | |
883 | for (i = 0; i < sockets_alloc; i++) | |
884 | switch (sockets[i].type) { | |
885 | case AUTH_UNUSED: | |
886 | break; | |
887 | case AUTH_SOCKET: | |
888 | if (FD_ISSET(sockets[i].fd, readset)) { | |
610cd5c6 | 889 | slen = sizeof(sunaddr); |
42f11eb2 | 890 | sock = accept(sockets[i].fd, |
32596c7b | 891 | (struct sockaddr *)&sunaddr, &slen); |
5260325f | 892 | if (sock < 0) { |
fccfbe3b | 893 | error("accept from AUTH_SOCKET: %s", |
894 | strerror(errno)); | |
5260325f | 895 | break; |
896 | } | |
87f4111f | 897 | if (getpeereid(sock, &euid, &egid) < 0) { |
898 | error("getpeereid %d failed: %s", | |
899 | sock, strerror(errno)); | |
900 | close(sock); | |
901 | break; | |
902 | } | |
e139021d | 903 | if ((euid != 0) && (getuid() != euid)) { |
87f4111f | 904 | error("uid mismatch: " |
792e7d2d | 905 | "peer euid %u != uid %u", |
906 | (u_int) euid, (u_int) getuid()); | |
87f4111f | 907 | close(sock); |
908 | break; | |
909 | } | |
5260325f | 910 | new_socket(AUTH_CONNECTION, sock); |
911 | } | |
912 | break; | |
913 | case AUTH_CONNECTION: | |
914 | if (buffer_len(&sockets[i].output) > 0 && | |
915 | FD_ISSET(sockets[i].fd, writeset)) { | |
bbc62e59 | 916 | do { |
917 | len = write(sockets[i].fd, | |
918 | buffer_ptr(&sockets[i].output), | |
919 | buffer_len(&sockets[i].output)); | |
920 | if (len == -1 && (errno == EAGAIN || | |
921 | errno == EINTR)) | |
922 | continue; | |
923 | break; | |
924 | } while (1); | |
5260325f | 925 | if (len <= 0) { |
c1a4eef1 | 926 | close_socket(&sockets[i]); |
5260325f | 927 | break; |
928 | } | |
929 | buffer_consume(&sockets[i].output, len); | |
930 | } | |
931 | if (FD_ISSET(sockets[i].fd, readset)) { | |
bbc62e59 | 932 | do { |
933 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
934 | if (len == -1 && (errno == EAGAIN || | |
935 | errno == EINTR)) | |
936 | continue; | |
937 | break; | |
938 | } while (1); | |
5260325f | 939 | if (len <= 0) { |
c1a4eef1 | 940 | close_socket(&sockets[i]); |
5260325f | 941 | break; |
942 | } | |
943 | buffer_append(&sockets[i].input, buf, len); | |
944 | process_message(&sockets[i]); | |
945 | } | |
946 | break; | |
947 | default: | |
948 | fatal("Unknown type %d", sockets[i].type); | |
949 | } | |
8efc0c15 | 950 | } |
951 | ||
396c147e | 952 | static void |
cd25664d | 953 | cleanup_socket(void) |
dae3fa13 | 954 | { |
2f4b2e38 | 955 | if (socket_name[0]) |
956 | unlink(socket_name); | |
957 | if (socket_dir[0]) | |
958 | rmdir(socket_dir); | |
8efc0c15 | 959 | } |
960 | ||
2362db19 | 961 | void |
dae3fa13 | 962 | cleanup_exit(int i) |
963 | { | |
cd25664d | 964 | cleanup_socket(); |
965 | _exit(i); | |
dae3fa13 | 966 | } |
967 | ||
8d0b0353 | 968 | /*ARGSUSED*/ |
396c147e | 969 | static void |
2f4b2e38 | 970 | cleanup_handler(int sig) |
971 | { | |
cd25664d | 972 | cleanup_socket(); |
2f4b2e38 | 973 | _exit(2); |
974 | } | |
975 | ||
8d0b0353 | 976 | /*ARGSUSED*/ |
7efa8482 | 977 | static void |
978 | check_parent_exists(int sig) | |
979 | { | |
980 | int save_errno = errno; | |
981 | ||
982 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { | |
983 | /* printf("Parent has died - Authentication agent exiting.\n"); */ | |
984 | cleanup_handler(sig); /* safe */ | |
985 | } | |
8d9bb5dd | 986 | mysignal(SIGALRM, check_parent_exists); |
7efa8482 | 987 | alarm(10); |
988 | errno = save_errno; | |
989 | } | |
990 | ||
396c147e | 991 | static void |
cc8aca8a | 992 | usage(void) |
dae3fa13 | 993 | { |
33e766d2 | 994 | fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", |
0e3c1f95 | 995 | __progname); |
33e766d2 | 996 | fprintf(stderr, "Options:\n"); |
997 | fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); | |
998 | fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); | |
999 | fprintf(stderr, " -k Kill the current agent.\n"); | |
1000 | fprintf(stderr, " -d Debug mode.\n"); | |
3e7efb37 | 1001 | fprintf(stderr, " -a socket Bind agent socket to given name.\n"); |
494b267f | 1002 | fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); |
5260325f | 1003 | exit(1); |
dae3fa13 | 1004 | } |
1005 | ||
8efc0c15 | 1006 | int |
1007 | main(int ac, char **av) | |
1008 | { | |
c4087616 | 1009 | int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; |
9a995072 | 1010 | int sock, fd, ch; |
1011 | u_int nalloc; | |
e424e241 | 1012 | char *shell, *format, *pidstr, *agentsocket = NULL; |
1013 | fd_set *readsetp = NULL, *writesetp = NULL; | |
5260325f | 1014 | struct sockaddr_un sunaddr; |
b03bd394 | 1015 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1016 | struct rlimit rlim; |
c7ccfd39 | 1017 | #endif |
c7ccfd39 | 1018 | int prev_mask; |
c04f75f1 | 1019 | extern int optind; |
ef3912be | 1020 | extern char *optarg; |
e424e241 | 1021 | pid_t pid; |
1022 | char pidstrbuf[1 + 3 * sizeof pid]; | |
fcb975eb | 1023 | |
fd6168c1 | 1024 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
1025 | sanitise_stdfd(); | |
1026 | ||
954640a4 | 1027 | /* drop */ |
1028 | setegid(getgid()); | |
1029 | setgid(getgid()); | |
1030 | ||
e7f6070d | 1031 | #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) |
1032 | /* Disable ptrace on Linux without sgid bit */ | |
1033 | prctl(PR_SET_DUMPABLE, 0); | |
1034 | #endif | |
1035 | ||
457fc0c6 | 1036 | SSLeay_add_all_algorithms(); |
1037 | ||
fda04d7d | 1038 | __progname = ssh_get_progname(av[0]); |
264dce47 | 1039 | init_rng(); |
e339aa53 | 1040 | seed_rng(); |
2b87da3b | 1041 | |
494b267f | 1042 | while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { |
5260325f | 1043 | switch (ch) { |
1044 | case 'c': | |
1045 | if (s_flag) | |
1046 | usage(); | |
1047 | c_flag++; | |
1048 | break; | |
1049 | case 'k': | |
1050 | k_flag++; | |
1051 | break; | |
1052 | case 's': | |
1053 | if (c_flag) | |
1054 | usage(); | |
1055 | s_flag++; | |
1056 | break; | |
ffdb5d70 | 1057 | case 'd': |
1058 | if (d_flag) | |
1059 | usage(); | |
1060 | d_flag++; | |
1061 | break; | |
3e7efb37 | 1062 | case 'a': |
1063 | agentsocket = optarg; | |
1064 | break; | |
494b267f | 1065 | case 't': |
1066 | if ((lifetime = convtime(optarg)) == -1) { | |
1067 | fprintf(stderr, "Invalid lifetime\n"); | |
1068 | usage(); | |
1069 | } | |
1070 | break; | |
5260325f | 1071 | default: |
1072 | usage(); | |
1073 | } | |
dae3fa13 | 1074 | } |
5260325f | 1075 | ac -= optind; |
1076 | av += optind; | |
1077 | ||
ffdb5d70 | 1078 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
5260325f | 1079 | usage(); |
1080 | ||
b745a2f2 | 1081 | if (ac == 0 && !c_flag && !s_flag) { |
5260325f | 1082 | shell = getenv("SHELL"); |
cfaa5405 | 1083 | if (shell != NULL && |
1084 | strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
5260325f | 1085 | c_flag = 1; |
dae3fa13 | 1086 | } |
5260325f | 1087 | if (k_flag) { |
cfaa5405 | 1088 | const char *errstr = NULL; |
1089 | ||
5260325f | 1090 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
1091 | if (pidstr == NULL) { | |
1092 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
42f11eb2 | 1093 | SSH_AGENTPID_ENV_NAME); |
5260325f | 1094 | exit(1); |
1095 | } | |
cfaa5405 | 1096 | pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); |
1097 | if (errstr) { | |
1098 | fprintf(stderr, | |
1099 | "%s=\"%s\", which is not a good PID: %s\n", | |
1100 | SSH_AGENTPID_ENV_NAME, pidstr, errstr); | |
5260325f | 1101 | exit(1); |
1102 | } | |
1103 | if (kill(pid, SIGTERM) == -1) { | |
1104 | perror("kill"); | |
1105 | exit(1); | |
1106 | } | |
1107 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
1108 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
1109 | printf(format, SSH_AGENTPID_ENV_NAME); | |
c457707e | 1110 | printf("echo Agent pid %ld killed;\n", (long)pid); |
5260325f | 1111 | exit(0); |
dae3fa13 | 1112 | } |
5260325f | 1113 | parent_pid = getpid(); |
1114 | ||
3e7efb37 | 1115 | if (agentsocket == NULL) { |
1116 | /* Create private directory for agent socket */ | |
c88de854 | 1117 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir); |
3e7efb37 | 1118 | if (mkdtemp(socket_dir) == NULL) { |
1119 | perror("mkdtemp: private socket dir"); | |
1120 | exit(1); | |
1121 | } | |
c457707e | 1122 | snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, |
1123 | (long)parent_pid); | |
3e7efb37 | 1124 | } else { |
1125 | /* Try to use specified agent socket */ | |
1126 | socket_dir[0] = '\0'; | |
1127 | strlcpy(socket_name, agentsocket, sizeof socket_name); | |
5260325f | 1128 | } |
5260325f | 1129 | |
aa3378df | 1130 | /* |
1131 | * Create socket early so it will exist before command gets run from | |
1132 | * the parent. | |
1133 | */ | |
5260325f | 1134 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
1135 | if (sock < 0) { | |
1136 | perror("socket"); | |
8e8d8c82 | 1137 | *socket_name = '\0'; /* Don't unlink any existing file */ |
5260325f | 1138 | cleanup_exit(1); |
1139 | } | |
1140 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
1141 | sunaddr.sun_family = AF_UNIX; | |
1142 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
c7ccfd39 | 1143 | prev_mask = umask(0177); |
32596c7b | 1144 | if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { |
5260325f | 1145 | perror("bind"); |
8e8d8c82 | 1146 | *socket_name = '\0'; /* Don't unlink any existing file */ |
c7ccfd39 | 1147 | umask(prev_mask); |
5260325f | 1148 | cleanup_exit(1); |
1149 | } | |
c7ccfd39 | 1150 | umask(prev_mask); |
fce39749 | 1151 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
5260325f | 1152 | perror("listen"); |
1153 | cleanup_exit(1); | |
dae3fa13 | 1154 | } |
42f11eb2 | 1155 | |
aa3378df | 1156 | /* |
1157 | * Fork, and have the parent execute the command, if any, or present | |
1158 | * the socket data. The child continues as the authentication agent. | |
1159 | */ | |
ffdb5d70 | 1160 | if (d_flag) { |
1161 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
1162 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1163 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
1164 | SSH_AUTHSOCKET_ENV_NAME); | |
c457707e | 1165 | printf("echo Agent pid %ld;\n", (long)parent_pid); |
ffdb5d70 | 1166 | goto skip; |
1167 | } | |
5260325f | 1168 | pid = fork(); |
1169 | if (pid == -1) { | |
1170 | perror("fork"); | |
fccfbe3b | 1171 | cleanup_exit(1); |
dae3fa13 | 1172 | } |
5260325f | 1173 | if (pid != 0) { /* Parent - execute the given command. */ |
1174 | close(sock); | |
c457707e | 1175 | snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); |
5260325f | 1176 | if (ac == 0) { |
1177 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
1178 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
42f11eb2 | 1179 | SSH_AUTHSOCKET_ENV_NAME); |
5260325f | 1180 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
42f11eb2 | 1181 | SSH_AGENTPID_ENV_NAME); |
c457707e | 1182 | printf("echo Agent pid %ld;\n", (long)pid); |
5260325f | 1183 | exit(0); |
1184 | } | |
bcbf86ec | 1185 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
1186 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
1187 | perror("setenv"); | |
1188 | exit(1); | |
1189 | } | |
5260325f | 1190 | execvp(av[0], av); |
1191 | perror(av[0]); | |
1192 | exit(1); | |
1193 | } | |
fccfbe3b | 1194 | /* child */ |
1195 | log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); | |
ec9f3450 | 1196 | |
1197 | if (setsid() == -1) { | |
fccfbe3b | 1198 | error("setsid: %s", strerror(errno)); |
ec9f3450 | 1199 | cleanup_exit(1); |
1200 | } | |
1201 | ||
1202 | (void)chdir("/"); | |
c4087616 | 1203 | if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
1204 | /* XXX might close listen socket */ | |
1205 | (void)dup2(fd, STDIN_FILENO); | |
1206 | (void)dup2(fd, STDOUT_FILENO); | |
1207 | (void)dup2(fd, STDERR_FILENO); | |
1208 | if (fd > 2) | |
1209 | close(fd); | |
1210 | } | |
dae3fa13 | 1211 | |
b03bd394 | 1212 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 1213 | /* deny core dumps, since memory contains unencrypted private keys */ |
1214 | rlim.rlim_cur = rlim.rlim_max = 0; | |
1215 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
fccfbe3b | 1216 | error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
0b6fbf03 | 1217 | cleanup_exit(1); |
1218 | } | |
b03bd394 | 1219 | #endif |
ffdb5d70 | 1220 | |
1221 | skip: | |
5260325f | 1222 | new_socket(AUTH_SOCKET, sock); |
1223 | if (ac > 0) { | |
8d9bb5dd | 1224 | mysignal(SIGALRM, check_parent_exists); |
5260325f | 1225 | alarm(10); |
1226 | } | |
2e73a022 | 1227 | idtab_init(); |
1ee482c5 | 1228 | if (!d_flag) |
ffdb5d70 | 1229 | signal(SIGINT, SIG_IGN); |
1ee482c5 | 1230 | signal(SIGPIPE, SIG_IGN); |
2f4b2e38 | 1231 | signal(SIGHUP, cleanup_handler); |
1232 | signal(SIGTERM, cleanup_handler); | |
e364646f | 1233 | nalloc = 0; |
1234 | ||
5260325f | 1235 | while (1) { |
e364646f | 1236 | prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); |
42f11eb2 | 1237 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { |
5260325f | 1238 | if (errno == EINTR) |
1239 | continue; | |
fccfbe3b | 1240 | fatal("select: %s", strerror(errno)); |
5260325f | 1241 | } |
42f11eb2 | 1242 | after_select(readsetp, writesetp); |
8efc0c15 | 1243 | } |
5260325f | 1244 | /* NOTREACHED */ |
8efc0c15 | 1245 | } |