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kernel - CAM cleanup 3/N - Remove unnecessary mplocks
[dragonfly.git] / crypto / openssh / ssh-agent.c
blobd85b98ea69b15ce955a18fa37459b4bffc2822b1
1 /* $OpenBSD: ssh-agent.c,v 1.213 2016/05/02 08:49:03 djm Exp $ */
2 /*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
6 * The authentication agent program.
7 *
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 *
14 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
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.
35 */
36
37 #include "includes.h"
38
39 #include <sys/param.h> /* MIN MAX */
40 #include <sys/types.h>
41 #include <sys/param.h>
42 #include <sys/resource.h>
43 #include <sys/stat.h>
44 #include <sys/socket.h>
45 #ifdef HAVE_SYS_TIME_H
46 # include <sys/time.h>
47 #endif
48 #ifdef HAVE_SYS_UN_H
49 # include <sys/un.h>
50 #endif
51 #include "openbsd-compat/sys-queue.h"
52
53 #ifdef WITH_OPENSSL
54 #include <openssl/evp.h>
55 #include "openbsd-compat/openssl-compat.h"
56 #endif
57
58 #include <errno.h>
59 #include <fcntl.h>
60 #include <limits.h>
61 #ifdef HAVE_PATHS_H
62 # include <paths.h>
63 #endif
64 #include <signal.h>
65 #include <stdarg.h>
66 #include <stdio.h>
67 #include <stdlib.h>
68 #include <time.h>
69 #include <string.h>
70 #include <unistd.h>
71 #ifdef HAVE_UTIL_H
72 # include <util.h>
73 #endif
74
75 #include "xmalloc.h"
76 #include "ssh.h"
77 #include "rsa.h"
78 #include "sshbuf.h"
79 #include "sshkey.h"
80 #include "authfd.h"
81 #include "compat.h"
82 #include "log.h"
83 #include "misc.h"
84 #include "digest.h"
85 #include "ssherr.h"
86
87 #ifdef ENABLE_PKCS11
88 #include "ssh-pkcs11.h"
89 #endif
90
91 typedef enum {
92 AUTH_UNUSED,
93 AUTH_SOCKET,
94 AUTH_CONNECTION
95 } sock_type;
96
97 typedef struct {
98 int fd;
99 sock_type type;
100 struct sshbuf *input;
101 struct sshbuf *output;
102 struct sshbuf *request;
103 } SocketEntry;
104
105 u_int sockets_alloc = 0;
106 SocketEntry *sockets = NULL;
107
108 typedef struct identity {
109 TAILQ_ENTRY(identity) next;
110 struct sshkey *key;
111 char *comment;
112 char *provider;
113 time_t death;
114 u_int confirm;
115 } Identity;
116
117 typedef struct {
118 int nentries;
119 TAILQ_HEAD(idqueue, identity) idlist;
120 } Idtab;
121
122 /* private key table, one per protocol version */
123 Idtab idtable[3];
124
125 int max_fd = 0;
126
127 /* pid of shell == parent of agent */
128 pid_t parent_pid = -1;
129 time_t parent_alive_interval = 0;
130
131 /* pid of process for which cleanup_socket is applicable */
132 pid_t cleanup_pid = 0;
133
134 /* pathname and directory for AUTH_SOCKET */
135 char socket_name[PATH_MAX];
136 char socket_dir[PATH_MAX];
137
138 /* locking */
139 #define LOCK_SIZE 32
140 #define LOCK_SALT_SIZE 16
141 #define LOCK_ROUNDS 1
142 int locked = 0;
143 u_char lock_pwhash[LOCK_SIZE];
144 u_char lock_salt[LOCK_SALT_SIZE];
145
146 extern char *__progname;
147
148 /* Default lifetime in seconds (0 == forever) */
149 static long lifetime = 0;
150
151 static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
152
153 static void
154 close_socket(SocketEntry *e)
155 {
156 close(e->fd);
157 e->fd = -1;
158 e->type = AUTH_UNUSED;
159 sshbuf_free(e->input);
160 sshbuf_free(e->output);
161 sshbuf_free(e->request);
162 }
163
164 static void
165 idtab_init(void)
166 {
167 int i;
168
169 for (i = 0; i <=2; i++) {
170 TAILQ_INIT(&idtable[i].idlist);
171 idtable[i].nentries = 0;
172 }
173 }
174
175 /* return private key table for requested protocol version */
176 static Idtab *
177 idtab_lookup(int version)
178 {
179 if (version < 1 || version > 2)
180 fatal("internal error, bad protocol version %d", version);
181 return &idtable[version];
182 }
183
184 static void
185 free_identity(Identity *id)
186 {
187 sshkey_free(id->key);
188 free(id->provider);
189 free(id->comment);
190 free(id);
191 }
192
193 /* return matching private key for given public key */
194 static Identity *
195 lookup_identity(struct sshkey *key, int version)
196 {
197 Identity *id;
198
199 Idtab *tab = idtab_lookup(version);
200 TAILQ_FOREACH(id, &tab->idlist, next) {
201 if (sshkey_equal(key, id->key))
202 return (id);
203 }
204 return (NULL);
205 }
206
207 /* Check confirmation of keysign request */
208 static int
209 confirm_key(Identity *id)
210 {
211 char *p;
212 int ret = -1;
213
214 p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT);
215 if (p != NULL &&
216 ask_permission("Allow use of key %s?\nKey fingerprint %s.",
217 id->comment, p))
218 ret = 0;
219 free(p);
220
221 return (ret);
222 }
223
224 static void
225 send_status(SocketEntry *e, int success)
226 {
227 int r;
228
229 if ((r = sshbuf_put_u32(e->output, 1)) != 0 ||
230 (r = sshbuf_put_u8(e->output, success ?
231 SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0)
232 fatal("%s: buffer error: %s", __func__, ssh_err(r));
233 }
234
235 /* send list of supported public keys to 'client' */
236 static void
237 process_request_identities(SocketEntry *e, int version)
238 {
239 Idtab *tab = idtab_lookup(version);
240 Identity *id;
241 struct sshbuf *msg;
242 int r;
243
244 if ((msg = sshbuf_new()) == NULL)
245 fatal("%s: sshbuf_new failed", __func__);
246 if ((r = sshbuf_put_u8(msg, (version == 1) ?
247 SSH_AGENT_RSA_IDENTITIES_ANSWER :
248 SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
249 (r = sshbuf_put_u32(msg, tab->nentries)) != 0)
250 fatal("%s: buffer error: %s", __func__, ssh_err(r));
251 TAILQ_FOREACH(id, &tab->idlist, next) {
252 if (id->key->type == KEY_RSA1) {
253 #ifdef WITH_SSH1
254 if ((r = sshbuf_put_u32(msg,
255 BN_num_bits(id->key->rsa->n))) != 0 ||
256 (r = sshbuf_put_bignum1(msg,
257 id->key->rsa->e)) != 0 ||
258 (r = sshbuf_put_bignum1(msg,
259 id->key->rsa->n)) != 0)
260 fatal("%s: buffer error: %s",
261 __func__, ssh_err(r));
262 #endif
263 } else {
264 u_char *blob;
265 size_t blen;
266
267 if ((r = sshkey_to_blob(id->key, &blob, &blen)) != 0) {
268 error("%s: sshkey_to_blob: %s", __func__,
269 ssh_err(r));
270 continue;
271 }
272 if ((r = sshbuf_put_string(msg, blob, blen)) != 0)
273 fatal("%s: buffer error: %s",
274 __func__, ssh_err(r));
275 free(blob);
276 }
277 if ((r = sshbuf_put_cstring(msg, id->comment)) != 0)
278 fatal("%s: buffer error: %s", __func__, ssh_err(r));
279 }
280 if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
281 fatal("%s: buffer error: %s", __func__, ssh_err(r));
282 sshbuf_free(msg);
283 }
284
285 #ifdef WITH_SSH1
286 /* ssh1 only */
287 static void
288 process_authentication_challenge1(SocketEntry *e)
289 {
290 u_char buf[32], mdbuf[16], session_id[16];
291 u_int response_type;
292 BIGNUM *challenge;
293 Identity *id;
294 int r, len;
295 struct sshbuf *msg;
296 struct ssh_digest_ctx *md;
297 struct sshkey *key;
298
299 if ((msg = sshbuf_new()) == NULL)
300 fatal("%s: sshbuf_new failed", __func__);
301 if ((key = sshkey_new(KEY_RSA1)) == NULL)
302 fatal("%s: sshkey_new failed", __func__);
303 if ((challenge = BN_new()) == NULL)
304 fatal("%s: BN_new failed", __func__);
305
306 if ((r = sshbuf_get_u32(e->request, NULL)) != 0 || /* ignored */
307 (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 ||
308 (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0 ||
309 (r = sshbuf_get_bignum1(e->request, challenge)))
310 fatal("%s: buffer error: %s", __func__, ssh_err(r));
311
312 /* Only protocol 1.1 is supported */
313 if (sshbuf_len(e->request) == 0)
314 goto failure;
315 if ((r = sshbuf_get(e->request, session_id, sizeof(session_id))) != 0 ||
316 (r = sshbuf_get_u32(e->request, &response_type)) != 0)
317 fatal("%s: buffer error: %s", __func__, ssh_err(r));
318 if (response_type != 1)
319 goto failure;
320
321 id = lookup_identity(key, 1);
322 if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
323 struct sshkey *private = id->key;
324 /* Decrypt the challenge using the private key. */
325 if ((r = rsa_private_decrypt(challenge, challenge,
326 private->rsa) != 0)) {
327 fatal("%s: rsa_public_encrypt: %s", __func__,
328 ssh_err(r));
329 goto failure; /* XXX ? */
330 }
331
332 /* The response is MD5 of decrypted challenge plus session id */
333 len = BN_num_bytes(challenge);
334 if (len <= 0 || len > 32) {
335 logit("%s: bad challenge length %d", __func__, len);
336 goto failure;
337 }
338 memset(buf, 0, 32);
339 BN_bn2bin(challenge, buf + 32 - len);
340 if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
341 ssh_digest_update(md, buf, 32) < 0 ||
342 ssh_digest_update(md, session_id, 16) < 0 ||
343 ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
344 fatal("%s: md5 failed", __func__);
345 ssh_digest_free(md);
346
347 /* Send the response. */
348 if ((r = sshbuf_put_u8(msg, SSH_AGENT_RSA_RESPONSE)) != 0 ||
349 (r = sshbuf_put(msg, mdbuf, sizeof(mdbuf))) != 0)
350 fatal("%s: buffer error: %s", __func__, ssh_err(r));
351 goto send;
352 }
353
354 failure:
355 /* Unknown identity or protocol error. Send failure. */
356 if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
357 fatal("%s: buffer error: %s", __func__, ssh_err(r));
358 send:
359 if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
360 fatal("%s: buffer error: %s", __func__, ssh_err(r));
361 sshkey_free(key);
362 BN_clear_free(challenge);
363 sshbuf_free(msg);
364 }
365 #endif
366
367 static char *
368 agent_decode_alg(struct sshkey *key, u_int flags)
369 {
370 if (key->type == KEY_RSA) {
371 if (flags & SSH_AGENT_RSA_SHA2_256)
372 return "rsa-sha2-256";
373 else if (flags & SSH_AGENT_RSA_SHA2_512)
374 return "rsa-sha2-512";
375 }
376 return NULL;
377 }
378
379 /* ssh2 only */
380 static void
381 process_sign_request2(SocketEntry *e)
382 {
383 u_char *blob, *data, *signature = NULL;
384 size_t blen, dlen, slen = 0;
385 u_int compat = 0, flags;
386 int r, ok = -1;
387 struct sshbuf *msg;
388 struct sshkey *key;
389 struct identity *id;
390
391 if ((msg = sshbuf_new()) == NULL)
392 fatal("%s: sshbuf_new failed", __func__);
393 if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0 ||
394 (r = sshbuf_get_string(e->request, &data, &dlen)) != 0 ||
395 (r = sshbuf_get_u32(e->request, &flags)) != 0)
396 fatal("%s: buffer error: %s", __func__, ssh_err(r));
397 if (flags & SSH_AGENT_OLD_SIGNATURE)
398 compat = SSH_BUG_SIGBLOB;
399 if ((r = sshkey_from_blob(blob, blen, &key)) != 0) {
400 error("%s: cannot parse key blob: %s", __func__, ssh_err(r));
401 goto send;
402 }
403 if ((id = lookup_identity(key, 2)) == NULL) {
404 verbose("%s: %s key not found", __func__, sshkey_type(key));
405 goto send;
406 }
407 if (id->confirm && confirm_key(id) != 0) {
408 verbose("%s: user refused key", __func__);
409 goto send;
410 }
411 if ((r = sshkey_sign(id->key, &signature, &slen,
412 data, dlen, agent_decode_alg(key, flags), compat)) != 0) {
413 error("%s: sshkey_sign: %s", __func__, ssh_err(r));
414 goto send;
415 }
416 /* Success */
417 ok = 0;
418 send:
419 sshkey_free(key);
420 if (ok == 0) {
421 if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
422 (r = sshbuf_put_string(msg, signature, slen)) != 0)
423 fatal("%s: buffer error: %s", __func__, ssh_err(r));
424 } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
425 fatal("%s: buffer error: %s", __func__, ssh_err(r));
426
427 if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
428 fatal("%s: buffer error: %s", __func__, ssh_err(r));
429
430 sshbuf_free(msg);
431 free(data);
432 free(blob);
433 free(signature);
434 }
435
436 /* shared */
437 static void
438 process_remove_identity(SocketEntry *e, int version)
439 {
440 size_t blen;
441 int r, success = 0;
442 struct sshkey *key = NULL;
443 u_char *blob;
444 #ifdef WITH_SSH1
445 u_int bits;
446 #endif /* WITH_SSH1 */
447
448 switch (version) {
449 #ifdef WITH_SSH1
450 case 1:
451 if ((key = sshkey_new(KEY_RSA1)) == NULL) {
452 error("%s: sshkey_new failed", __func__);
453 return;
454 }
455 if ((r = sshbuf_get_u32(e->request, &bits)) != 0 ||
456 (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 ||
457 (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0)
458 fatal("%s: buffer error: %s", __func__, ssh_err(r));
459
460 if (bits != sshkey_size(key))
461 logit("Warning: identity keysize mismatch: "
462 "actual %u, announced %u",
463 sshkey_size(key), bits);
464 break;
465 #endif /* WITH_SSH1 */
466 case 2:
467 if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0)
468 fatal("%s: buffer error: %s", __func__, ssh_err(r));
469 if ((r = sshkey_from_blob(blob, blen, &key)) != 0)
470 error("%s: sshkey_from_blob failed: %s",
471 __func__, ssh_err(r));
472 free(blob);
473 break;
474 }
475 if (key != NULL) {
476 Identity *id = lookup_identity(key, version);
477 if (id != NULL) {
478 /*
479 * We have this key. Free the old key. Since we
480 * don't want to leave empty slots in the middle of
481 * the array, we actually free the key there and move
482 * all the entries between the empty slot and the end
483 * of the array.
484 */
485 Idtab *tab = idtab_lookup(version);
486 if (tab->nentries < 1)
487 fatal("process_remove_identity: "
488 "internal error: tab->nentries %d",
489 tab->nentries);
490 TAILQ_REMOVE(&tab->idlist, id, next);
491 free_identity(id);
492 tab->nentries--;
493 success = 1;
494 }
495 sshkey_free(key);
496 }
497 send_status(e, success);
498 }
499
500 static void
501 process_remove_all_identities(SocketEntry *e, int version)
502 {
503 Idtab *tab = idtab_lookup(version);
504 Identity *id;
505
506 /* Loop over all identities and clear the keys. */
507 for (id = TAILQ_FIRST(&tab->idlist); id;
508 id = TAILQ_FIRST(&tab->idlist)) {
509 TAILQ_REMOVE(&tab->idlist, id, next);
510 free_identity(id);
511 }
512
513 /* Mark that there are no identities. */
514 tab->nentries = 0;
515
516 /* Send success. */
517 send_status(e, 1);
518 }
519
520 /* removes expired keys and returns number of seconds until the next expiry */
521 static time_t
522 reaper(void)
523 {
524 time_t deadline = 0, now = monotime();
525 Identity *id, *nxt;
526 int version;
527 Idtab *tab;
528
529 for (version = 1; version < 3; version++) {
530 tab = idtab_lookup(version);
531 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
532 nxt = TAILQ_NEXT(id, next);
533 if (id->death == 0)
534 continue;
535 if (now >= id->death) {
536 debug("expiring key '%s'", id->comment);
537 TAILQ_REMOVE(&tab->idlist, id, next);
538 free_identity(id);
539 tab->nentries--;
540 } else
541 deadline = (deadline == 0) ? id->death :
542 MIN(deadline, id->death);
543 }
544 }
545 if (deadline == 0 || deadline <= now)
546 return 0;
547 else
548 return (deadline - now);
549 }
550
551 /*
552 * XXX this and the corresponding serialisation function probably belongs
553 * in key.c
554 */
555 #ifdef WITH_SSH1
556 static int
557 agent_decode_rsa1(struct sshbuf *m, struct sshkey **kp)
558 {
559 struct sshkey *k = NULL;
560 int r = SSH_ERR_INTERNAL_ERROR;
561
562 *kp = NULL;
563 if ((k = sshkey_new_private(KEY_RSA1)) == NULL)
564 return SSH_ERR_ALLOC_FAIL;
565
566 if ((r = sshbuf_get_u32(m, NULL)) != 0 || /* ignored */
567 (r = sshbuf_get_bignum1(m, k->rsa->n)) != 0 ||
568 (r = sshbuf_get_bignum1(m, k->rsa->e)) != 0 ||
569 (r = sshbuf_get_bignum1(m, k->rsa->d)) != 0 ||
570 (r = sshbuf_get_bignum1(m, k->rsa->iqmp)) != 0 ||
571 /* SSH1 and SSL have p and q swapped */
572 (r = sshbuf_get_bignum1(m, k->rsa->q)) != 0 || /* p */
573 (r = sshbuf_get_bignum1(m, k->rsa->p)) != 0) /* q */
574 goto out;
575
576 /* Generate additional parameters */
577 if ((r = rsa_generate_additional_parameters(k->rsa)) != 0)
578 goto out;
579 /* enable blinding */
580 if (RSA_blinding_on(k->rsa, NULL) != 1) {
581 r = SSH_ERR_LIBCRYPTO_ERROR;
582 goto out;
583 }
584
585 r = 0; /* success */
586 out:
587 if (r == 0)
588 *kp = k;
589 else
590 sshkey_free(k);
591 return r;
592 }
593 #endif /* WITH_SSH1 */
594
595 static void
596 process_add_identity(SocketEntry *e, int version)
597 {
598 Idtab *tab = idtab_lookup(version);
599 Identity *id;
600 int success = 0, confirm = 0;
601 u_int seconds;
602 char *comment = NULL;
603 time_t death = 0;
604 struct sshkey *k = NULL;
605 u_char ctype;
606 int r = SSH_ERR_INTERNAL_ERROR;
607
608 switch (version) {
609 #ifdef WITH_SSH1
610 case 1:
611 r = agent_decode_rsa1(e->request, &k);
612 break;
613 #endif /* WITH_SSH1 */
614 case 2:
615 r = sshkey_private_deserialize(e->request, &k);
616 break;
617 }
618 if (r != 0 || k == NULL ||
619 (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
620 error("%s: decode private key: %s", __func__, ssh_err(r));
621 goto err;
622 }
623
624 while (sshbuf_len(e->request)) {
625 if ((r = sshbuf_get_u8(e->request, &ctype)) != 0) {
626 error("%s: buffer error: %s", __func__, ssh_err(r));
627 goto err;
628 }
629 switch (ctype) {
630 case SSH_AGENT_CONSTRAIN_LIFETIME:
631 if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) {
632 error("%s: bad lifetime constraint: %s",
633 __func__, ssh_err(r));
634 goto err;
635 }
636 death = monotime() + seconds;
637 break;
638 case SSH_AGENT_CONSTRAIN_CONFIRM:
639 confirm = 1;
640 break;
641 default:
642 error("%s: Unknown constraint %d", __func__, ctype);
643 err:
644 sshbuf_reset(e->request);
645 free(comment);
646 sshkey_free(k);
647 goto send;
648 }
649 }
650
651 success = 1;
652 if (lifetime && !death)
653 death = monotime() + lifetime;
654 if ((id = lookup_identity(k, version)) == NULL) {
655 id = xcalloc(1, sizeof(Identity));
656 id->key = k;
657 TAILQ_INSERT_TAIL(&tab->idlist, id, next);
658 /* Increment the number of identities. */
659 tab->nentries++;
660 } else {
661 sshkey_free(k);
662 free(id->comment);
663 }
664 id->comment = comment;
665 id->death = death;
666 id->confirm = confirm;
667 send:
668 send_status(e, success);
669 }
670
671 /* XXX todo: encrypt sensitive data with passphrase */
672 static void
673 process_lock_agent(SocketEntry *e, int lock)
674 {
675 int r, success = 0, delay;
676 char *passwd;
677 u_char passwdhash[LOCK_SIZE];
678 static u_int fail_count = 0;
679 size_t pwlen;
680
681 if ((r = sshbuf_get_cstring(e->request, &passwd, &pwlen)) != 0)
682 fatal("%s: buffer error: %s", __func__, ssh_err(r));
683 if (pwlen == 0) {
684 debug("empty password not supported");
685 } else if (locked && !lock) {
686 if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
687 passwdhash, sizeof(passwdhash), LOCK_ROUNDS) < 0)
688 fatal("bcrypt_pbkdf");
689 if (timingsafe_bcmp(passwdhash, lock_pwhash, LOCK_SIZE) == 0) {
690 debug("agent unlocked");
691 locked = 0;
692 fail_count = 0;
693 explicit_bzero(lock_pwhash, sizeof(lock_pwhash));
694 success = 1;
695 } else {
696 /* delay in 0.1s increments up to 10s */
697 if (fail_count < 100)
698 fail_count++;
699 delay = 100000 * fail_count;
700 debug("unlock failed, delaying %0.1lf seconds",
701 (double)delay/1000000);
702 usleep(delay);
703 }
704 explicit_bzero(passwdhash, sizeof(passwdhash));
705 } else if (!locked && lock) {
706 debug("agent locked");
707 locked = 1;
708 arc4random_buf(lock_salt, sizeof(lock_salt));
709 if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
710 lock_pwhash, sizeof(lock_pwhash), LOCK_ROUNDS) < 0)
711 fatal("bcrypt_pbkdf");
712 success = 1;
713 }
714 explicit_bzero(passwd, pwlen);
715 free(passwd);
716 send_status(e, success);
717 }
718
719 static void
720 no_identities(SocketEntry *e, u_int type)
721 {
722 struct sshbuf *msg;
723 int r;
724
725 if ((msg = sshbuf_new()) == NULL)
726 fatal("%s: sshbuf_new failed", __func__);
727 if ((r = sshbuf_put_u8(msg,
728 (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
729 SSH_AGENT_RSA_IDENTITIES_ANSWER :
730 SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
731 (r = sshbuf_put_u32(msg, 0)) != 0 ||
732 (r = sshbuf_put_stringb(e->output, msg)) != 0)
733 fatal("%s: buffer error: %s", __func__, ssh_err(r));
734 sshbuf_free(msg);
735 }
736
737 #ifdef ENABLE_PKCS11
738 static void
739 process_add_smartcard_key(SocketEntry *e)
740 {
741 char *provider = NULL, *pin;
742 int r, i, version, count = 0, success = 0, confirm = 0;
743 u_int seconds;
744 time_t death = 0;
745 u_char type;
746 struct sshkey **keys = NULL, *k;
747 Identity *id;
748 Idtab *tab;
749
750 if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
751 (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
752 fatal("%s: buffer error: %s", __func__, ssh_err(r));
753
754 while (sshbuf_len(e->request)) {
755 if ((r = sshbuf_get_u8(e->request, &type)) != 0)
756 fatal("%s: buffer error: %s", __func__, ssh_err(r));
757 switch (type) {
758 case SSH_AGENT_CONSTRAIN_LIFETIME:
759 if ((r = sshbuf_get_u32(e->request, &seconds)) != 0)
760 fatal("%s: buffer error: %s",
761 __func__, ssh_err(r));
762 death = monotime() + seconds;
763 break;
764 case SSH_AGENT_CONSTRAIN_CONFIRM:
765 confirm = 1;
766 break;
767 default:
768 error("process_add_smartcard_key: "
769 "Unknown constraint type %d", type);
770 goto send;
771 }
772 }
773 if (lifetime && !death)
774 death = monotime() + lifetime;
775
776 count = pkcs11_add_provider(provider, pin, &keys);
777 for (i = 0; i < count; i++) {
778 k = keys[i];
779 version = k->type == KEY_RSA1 ? 1 : 2;
780 tab = idtab_lookup(version);
781 if (lookup_identity(k, version) == NULL) {
782 id = xcalloc(1, sizeof(Identity));
783 id->key = k;
784 id->provider = xstrdup(provider);
785 id->comment = xstrdup(provider); /* XXX */
786 id->death = death;
787 id->confirm = confirm;
788 TAILQ_INSERT_TAIL(&tab->idlist, id, next);
789 tab->nentries++;
790 success = 1;
791 } else {
792 sshkey_free(k);
793 }
794 keys[i] = NULL;
795 }
796 send:
797 free(pin);
798 free(provider);
799 free(keys);
800 send_status(e, success);
801 }
802
803 static void
804 process_remove_smartcard_key(SocketEntry *e)
805 {
806 char *provider = NULL, *pin = NULL;
807 int r, version, success = 0;
808 Identity *id, *nxt;
809 Idtab *tab;
810
811 if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
812 (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
813 fatal("%s: buffer error: %s", __func__, ssh_err(r));
814 free(pin);
815
816 for (version = 1; version < 3; version++) {
817 tab = idtab_lookup(version);
818 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
819 nxt = TAILQ_NEXT(id, next);
820 /* Skip file--based keys */
821 if (id->provider == NULL)
822 continue;
823 if (!strcmp(provider, id->provider)) {
824 TAILQ_REMOVE(&tab->idlist, id, next);
825 free_identity(id);
826 tab->nentries--;
827 }
828 }
829 }
830 if (pkcs11_del_provider(provider) == 0)
831 success = 1;
832 else
833 error("process_remove_smartcard_key:"
834 " pkcs11_del_provider failed");
835 free(provider);
836 send_status(e, success);
837 }
838 #endif /* ENABLE_PKCS11 */
839
840 /* dispatch incoming messages */
841
842 static void
843 process_message(SocketEntry *e)
844 {
845 u_int msg_len;
846 u_char type;
847 const u_char *cp;
848 int r;
849
850 if (sshbuf_len(e->input) < 5)
851 return; /* Incomplete message. */
852 cp = sshbuf_ptr(e->input);
853 msg_len = PEEK_U32(cp);
854 if (msg_len > 256 * 1024) {
855 close_socket(e);
856 return;
857 }
858 if (sshbuf_len(e->input) < msg_len + 4)
859 return;
860
861 /* move the current input to e->request */
862 sshbuf_reset(e->request);
863 if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
864 (r = sshbuf_get_u8(e->request, &type)) != 0)
865 fatal("%s: buffer error: %s", __func__, ssh_err(r));
866
867 /* check wheter agent is locked */
868 if (locked && type != SSH_AGENTC_UNLOCK) {
869 sshbuf_reset(e->request);
870 switch (type) {
871 case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
872 case SSH2_AGENTC_REQUEST_IDENTITIES:
873 /* send empty lists */
874 no_identities(e, type);
875 break;
876 default:
877 /* send a fail message for all other request types */
878 send_status(e, 0);
879 }
880 return;
881 }
882
883 debug("type %d", type);
884 switch (type) {
885 case SSH_AGENTC_LOCK:
886 case SSH_AGENTC_UNLOCK:
887 process_lock_agent(e, type == SSH_AGENTC_LOCK);
888 break;
889 #ifdef WITH_SSH1
890 /* ssh1 */
891 case SSH_AGENTC_RSA_CHALLENGE:
892 process_authentication_challenge1(e);
893 break;
894 case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
895 process_request_identities(e, 1);
896 break;
897 case SSH_AGENTC_ADD_RSA_IDENTITY:
898 case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
899 process_add_identity(e, 1);
900 break;
901 case SSH_AGENTC_REMOVE_RSA_IDENTITY:
902 process_remove_identity(e, 1);
903 break;
904 #endif
905 case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
906 process_remove_all_identities(e, 1); /* safe for !WITH_SSH1 */
907 break;
908 /* ssh2 */
909 case SSH2_AGENTC_SIGN_REQUEST:
910 process_sign_request2(e);
911 break;
912 case SSH2_AGENTC_REQUEST_IDENTITIES:
913 process_request_identities(e, 2);
914 break;
915 case SSH2_AGENTC_ADD_IDENTITY:
916 case SSH2_AGENTC_ADD_ID_CONSTRAINED:
917 process_add_identity(e, 2);
918 break;
919 case SSH2_AGENTC_REMOVE_IDENTITY:
920 process_remove_identity(e, 2);
921 break;
922 case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
923 process_remove_all_identities(e, 2);
924 break;
925 #ifdef ENABLE_PKCS11
926 case SSH_AGENTC_ADD_SMARTCARD_KEY:
927 case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
928 process_add_smartcard_key(e);
929 break;
930 case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
931 process_remove_smartcard_key(e);
932 break;
933 #endif /* ENABLE_PKCS11 */
934 default:
935 /* Unknown message. Respond with failure. */
936 error("Unknown message %d", type);
937 sshbuf_reset(e->request);
938 send_status(e, 0);
939 break;
940 }
941 }
942
943 static void
944 new_socket(sock_type type, int fd)
945 {
946 u_int i, old_alloc, new_alloc;
947
948 set_nonblock(fd);
949
950 if (fd > max_fd)
951 max_fd = fd;
952
953 for (i = 0; i < sockets_alloc; i++)
954 if (sockets[i].type == AUTH_UNUSED) {
955 sockets[i].fd = fd;
956 if ((sockets[i].input = sshbuf_new()) == NULL)
957 fatal("%s: sshbuf_new failed", __func__);
958 if ((sockets[i].output = sshbuf_new()) == NULL)
959 fatal("%s: sshbuf_new failed", __func__);
960 if ((sockets[i].request = sshbuf_new()) == NULL)
961 fatal("%s: sshbuf_new failed", __func__);
962 sockets[i].type = type;
963 return;
964 }
965 old_alloc = sockets_alloc;
966 new_alloc = sockets_alloc + 10;
967 sockets = xreallocarray(sockets, new_alloc, sizeof(sockets[0]));
968 for (i = old_alloc; i < new_alloc; i++)
969 sockets[i].type = AUTH_UNUSED;
970 sockets_alloc = new_alloc;
971 sockets[old_alloc].fd = fd;
972 if ((sockets[old_alloc].input = sshbuf_new()) == NULL)
973 fatal("%s: sshbuf_new failed", __func__);
974 if ((sockets[old_alloc].output = sshbuf_new()) == NULL)
975 fatal("%s: sshbuf_new failed", __func__);
976 if ((sockets[old_alloc].request = sshbuf_new()) == NULL)
977 fatal("%s: sshbuf_new failed", __func__);
978 sockets[old_alloc].type = type;
979 }
980
981 static int
982 prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
983 struct timeval **tvpp)
984 {
985 u_int i, sz;
986 int n = 0;
987 static struct timeval tv;
988 time_t deadline;
989
990 for (i = 0; i < sockets_alloc; i++) {
991 switch (sockets[i].type) {
992 case AUTH_SOCKET:
993 case AUTH_CONNECTION:
994 n = MAX(n, sockets[i].fd);
995 break;
996 case AUTH_UNUSED:
997 break;
998 default:
999 fatal("Unknown socket type %d", sockets[i].type);
1000 break;
1001 }
1002 }
1003
1004 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1005 if (*fdrp == NULL || sz > *nallocp) {
1006 free(*fdrp);
1007 free(*fdwp);
1008 *fdrp = xmalloc(sz);
1009 *fdwp = xmalloc(sz);
1010 *nallocp = sz;
1011 }
1012 if (n < *fdl)
1013 debug("XXX shrink: %d < %d", n, *fdl);
1014 *fdl = n;
1015 memset(*fdrp, 0, sz);
1016 memset(*fdwp, 0, sz);
1017
1018 for (i = 0; i < sockets_alloc; i++) {
1019 switch (sockets[i].type) {
1020 case AUTH_SOCKET:
1021 case AUTH_CONNECTION:
1022 FD_SET(sockets[i].fd, *fdrp);
1023 if (sshbuf_len(sockets[i].output) > 0)
1024 FD_SET(sockets[i].fd, *fdwp);
1025 break;
1026 default:
1027 break;
1028 }
1029 }
1030 deadline = reaper();
1031 if (parent_alive_interval != 0)
1032 deadline = (deadline == 0) ? parent_alive_interval :
1033 MIN(deadline, parent_alive_interval);
1034 if (deadline == 0) {
1035 *tvpp = NULL;
1036 } else {
1037 tv.tv_sec = deadline;
1038 tv.tv_usec = 0;
1039 *tvpp = &tv;
1040 }
1041 return (1);
1042 }
1043
1044 static void
1045 after_select(fd_set *readset, fd_set *writeset)
1046 {
1047 struct sockaddr_un sunaddr;
1048 socklen_t slen;
1049 char buf[1024];
1050 int len, sock, r;
1051 u_int i, orig_alloc;
1052 uid_t euid;
1053 gid_t egid;
1054
1055 for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1056 switch (sockets[i].type) {
1057 case AUTH_UNUSED:
1058 break;
1059 case AUTH_SOCKET:
1060 if (FD_ISSET(sockets[i].fd, readset)) {
1061 slen = sizeof(sunaddr);
1062 sock = accept(sockets[i].fd,
1063 (struct sockaddr *)&sunaddr, &slen);
1064 if (sock < 0) {
1065 error("accept from AUTH_SOCKET: %s",
1066 strerror(errno));
1067 break;
1068 }
1069 if (getpeereid(sock, &euid, &egid) < 0) {
1070 error("getpeereid %d failed: %s",
1071 sock, strerror(errno));
1072 close(sock);
1073 break;
1074 }
1075 if ((euid != 0) && (getuid() != euid)) {
1076 error("uid mismatch: "
1077 "peer euid %u != uid %u",
1078 (u_int) euid, (u_int) getuid());
1079 close(sock);
1080 break;
1081 }
1082 new_socket(AUTH_CONNECTION, sock);
1083 }
1084 break;
1085 case AUTH_CONNECTION:
1086 if (sshbuf_len(sockets[i].output) > 0 &&
1087 FD_ISSET(sockets[i].fd, writeset)) {
1088 len = write(sockets[i].fd,
1089 sshbuf_ptr(sockets[i].output),
1090 sshbuf_len(sockets[i].output));
1091 if (len == -1 && (errno == EAGAIN ||
1092 errno == EWOULDBLOCK ||
1093 errno == EINTR))
1094 continue;
1095 if (len <= 0) {
1096 close_socket(&sockets[i]);
1097 break;
1098 }
1099 if ((r = sshbuf_consume(sockets[i].output,
1100 len)) != 0)
1101 fatal("%s: buffer error: %s",
1102 __func__, ssh_err(r));
1103 }
1104 if (FD_ISSET(sockets[i].fd, readset)) {
1105 len = read(sockets[i].fd, buf, sizeof(buf));
1106 if (len == -1 && (errno == EAGAIN ||
1107 errno == EWOULDBLOCK ||
1108 errno == EINTR))
1109 continue;
1110 if (len <= 0) {
1111 close_socket(&sockets[i]);
1112 break;
1113 }
1114 if ((r = sshbuf_put(sockets[i].input,
1115 buf, len)) != 0)
1116 fatal("%s: buffer error: %s",
1117 __func__, ssh_err(r));
1118 explicit_bzero(buf, sizeof(buf));
1119 process_message(&sockets[i]);
1120 }
1121 break;
1122 default:
1123 fatal("Unknown type %d", sockets[i].type);
1124 }
1125 }
1126
1127 static void
1128 cleanup_socket(void)
1129 {
1130 if (cleanup_pid != 0 && getpid() != cleanup_pid)
1131 return;
1132 debug("%s: cleanup", __func__);
1133 if (socket_name[0])
1134 unlink(socket_name);
1135 if (socket_dir[0])
1136 rmdir(socket_dir);
1137 }
1138
1139 void
1140 cleanup_exit(int i)
1141 {
1142 cleanup_socket();
1143 _exit(i);
1144 }
1145
1146 /*ARGSUSED*/
1147 static void
1148 cleanup_handler(int sig)
1149 {
1150 cleanup_socket();
1151 #ifdef ENABLE_PKCS11
1152 pkcs11_terminate();
1153 #endif
1154 _exit(2);
1155 }
1156
1157 static void
1158 check_parent_exists(void)
1159 {
1160 /*
1161 * If our parent has exited then getppid() will return (pid_t)1,
1162 * so testing for that should be safe.
1163 */
1164 if (parent_pid != -1 && getppid() != parent_pid) {
1165 /* printf("Parent has died - Authentication agent exiting.\n"); */
1166 cleanup_socket();
1167 _exit(2);
1168 }
1169 }
1170
1171 static void
1172 usage(void)
1173 {
1174 fprintf(stderr,
1175 "usage: ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]\n"
1176 " [-t life] [command [arg ...]]\n"
1177 " ssh-agent [-c | -s] -k\n");
1178 exit(1);
1179 }
1180
1181 int
1182 main(int ac, char **av)
1183 {
1184 int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0;
1185 int sock, fd, ch, result, saved_errno;
1186 u_int nalloc;
1187 char *shell, *format, *pidstr, *agentsocket = NULL;
1188 fd_set *readsetp = NULL, *writesetp = NULL;
1189 #ifdef HAVE_SETRLIMIT
1190 struct rlimit rlim;
1191 #endif
1192 extern int optind;
1193 extern char *optarg;
1194 pid_t pid;
1195 char pidstrbuf[1 + 3 * sizeof pid];
1196 struct timeval *tvp = NULL;
1197 size_t len;
1198 mode_t prev_mask;
1199
1200 ssh_malloc_init(); /* must be called before any mallocs */
1201 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1202 sanitise_stdfd();
1203
1204 /* drop */
1205 setegid(getgid());
1206 setgid(getgid());
1207 setuid(geteuid());
1208
1209 platform_disable_tracing(0); /* strict=no */
1210
1211 #ifdef WITH_OPENSSL
1212 OpenSSL_add_all_algorithms();
1213 #endif
1214
1215 __progname = ssh_get_progname(av[0]);
1216 seed_rng();
1217
1218 while ((ch = getopt(ac, av, "cDdksE:a:t:")) != -1) {
1219 switch (ch) {
1220 case 'E':
1221 fingerprint_hash = ssh_digest_alg_by_name(optarg);
1222 if (fingerprint_hash == -1)
1223 fatal("Invalid hash algorithm \"%s\"", optarg);
1224 break;
1225 case 'c':
1226 if (s_flag)
1227 usage();
1228 c_flag++;
1229 break;
1230 case 'k':
1231 k_flag++;
1232 break;
1233 case 's':
1234 if (c_flag)
1235 usage();
1236 s_flag++;
1237 break;
1238 case 'd':
1239 if (d_flag || D_flag)
1240 usage();
1241 d_flag++;
1242 break;
1243 case 'D':
1244 if (d_flag || D_flag)
1245 usage();
1246 D_flag++;
1247 break;
1248 case 'a':
1249 agentsocket = optarg;
1250 break;
1251 case 't':
1252 if ((lifetime = convtime(optarg)) == -1) {
1253 fprintf(stderr, "Invalid lifetime\n");
1254 usage();
1255 }
1256 break;
1257 default:
1258 usage();
1259 }
1260 }
1261 ac -= optind;
1262 av += optind;
1263
1264 if (ac > 0 && (c_flag || k_flag || s_flag || d_flag || D_flag))
1265 usage();
1266
1267 if (ac == 0 && !c_flag && !s_flag) {
1268 shell = getenv("SHELL");
1269 if (shell != NULL && (len = strlen(shell)) > 2 &&
1270 strncmp(shell + len - 3, "csh", 3) == 0)
1271 c_flag = 1;
1272 }
1273 if (k_flag) {
1274 const char *errstr = NULL;
1275
1276 pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1277 if (pidstr == NULL) {
1278 fprintf(stderr, "%s not set, cannot kill agent\n",
1279 SSH_AGENTPID_ENV_NAME);
1280 exit(1);
1281 }
1282 pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1283 if (errstr) {
1284 fprintf(stderr,
1285 "%s=\"%s\", which is not a good PID: %s\n",
1286 SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1287 exit(1);
1288 }
1289 if (kill(pid, SIGTERM) == -1) {
1290 perror("kill");
1291 exit(1);
1292 }
1293 format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1294 printf(format, SSH_AUTHSOCKET_ENV_NAME);
1295 printf(format, SSH_AGENTPID_ENV_NAME);
1296 printf("echo Agent pid %ld killed;\n", (long)pid);
1297 exit(0);
1298 }
1299 parent_pid = getpid();
1300
1301 if (agentsocket == NULL) {
1302 /* Create private directory for agent socket */
1303 mktemp_proto(socket_dir, sizeof(socket_dir));
1304 if (mkdtemp(socket_dir) == NULL) {
1305 perror("mkdtemp: private socket dir");
1306 exit(1);
1307 }
1308 snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1309 (long)parent_pid);
1310 } else {
1311 /* Try to use specified agent socket */
1312 socket_dir[0] = '\0';
1313 strlcpy(socket_name, agentsocket, sizeof socket_name);
1314 }
1315
1316 /*
1317 * Create socket early so it will exist before command gets run from
1318 * the parent.
1319 */
1320 prev_mask = umask(0177);
1321 sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1322 if (sock < 0) {
1323 /* XXX - unix_listener() calls error() not perror() */
1324 *socket_name = '\0'; /* Don't unlink any existing file */
1325 cleanup_exit(1);
1326 }
1327 umask(prev_mask);
1328
1329 /*
1330 * Fork, and have the parent execute the command, if any, or present
1331 * the socket data. The child continues as the authentication agent.
1332 */
1333 if (D_flag || d_flag) {
1334 log_init(__progname,
1335 d_flag ? SYSLOG_LEVEL_DEBUG3 : SYSLOG_LEVEL_INFO,
1336 SYSLOG_FACILITY_AUTH, 1);
1337 format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1338 printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1339 SSH_AUTHSOCKET_ENV_NAME);
1340 printf("echo Agent pid %ld;\n", (long)parent_pid);
1341 fflush(stdout);
1342 goto skip;
1343 }
1344 pid = fork();
1345 if (pid == -1) {
1346 perror("fork");
1347 cleanup_exit(1);
1348 }
1349 if (pid != 0) { /* Parent - execute the given command. */
1350 close(sock);
1351 snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1352 if (ac == 0) {
1353 format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1354 printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1355 SSH_AUTHSOCKET_ENV_NAME);
1356 printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1357 SSH_AGENTPID_ENV_NAME);
1358 printf("echo Agent pid %ld;\n", (long)pid);
1359 exit(0);
1360 }
1361 if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1362 setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1363 perror("setenv");
1364 exit(1);
1365 }
1366 execvp(av[0], av);
1367 perror(av[0]);
1368 exit(1);
1369 }
1370 /* child */
1371 log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1372
1373 if (setsid() == -1) {
1374 error("setsid: %s", strerror(errno));
1375 cleanup_exit(1);
1376 }
1377
1378 (void)chdir("/");
1379 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1380 /* XXX might close listen socket */
1381 (void)dup2(fd, STDIN_FILENO);
1382 (void)dup2(fd, STDOUT_FILENO);
1383 (void)dup2(fd, STDERR_FILENO);
1384 if (fd > 2)
1385 close(fd);
1386 }
1387
1388 #ifdef HAVE_SETRLIMIT
1389 /* deny core dumps, since memory contains unencrypted private keys */
1390 rlim.rlim_cur = rlim.rlim_max = 0;
1391 if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1392 error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1393 cleanup_exit(1);
1394 }
1395 #endif
1396
1397 skip:
1398
1399 cleanup_pid = getpid();
1400
1401 #ifdef ENABLE_PKCS11
1402 pkcs11_init(0);
1403 #endif
1404 new_socket(AUTH_SOCKET, sock);
1405 if (ac > 0)
1406 parent_alive_interval = 10;
1407 idtab_init();
1408 signal(SIGPIPE, SIG_IGN);
1409 signal(SIGINT, (d_flag | D_flag) ? cleanup_handler : SIG_IGN);
1410 signal(SIGHUP, cleanup_handler);
1411 signal(SIGTERM, cleanup_handler);
1412 nalloc = 0;
1413
1414 if (pledge("stdio cpath unix id proc exec", NULL) == -1)
1415 fatal("%s: pledge: %s", __progname, strerror(errno));
1416 platform_pledge_agent();
1417
1418 while (1) {
1419 prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1420 result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1421 saved_errno = errno;
1422 if (parent_alive_interval != 0)
1423 check_parent_exists();
1424 (void) reaper(); /* remove expired keys */
1425 if (result < 0) {
1426 if (saved_errno == EINTR)
1427 continue;
1428 fatal("select: %s", strerror(saved_errno));
1429 } else if (result > 0)
1430 after_select(readsetp, writesetp);
1431 }
1432 /* NOTREACHED */
1433 }
DragonFly BSD