1 /* $NetBSD: ssh-agent.c,v 1.27 2019/10/12 18:32:22 christos Exp $ */ 2 /* $OpenBSD: ssh-agent.c,v 1.237 2019/06/28 13:35:04 deraadt Exp $ */ 3 /* 4 * Author: Tatu Ylonen <ylo@cs.hut.fi> 5 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 6 * All rights reserved 7 * The authentication agent program. 8 * 9 * As far as I am concerned, the code I have written for this software 10 * can be used freely for any purpose. Any derived versions of this 11 * software must be clearly marked as such, and if the derived work is 12 * incompatible with the protocol description in the RFC file, it must be 13 * called by a name other than "ssh" or "Secure Shell". 14 * 15 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include "includes.h" 39 __RCSID("$NetBSD: ssh-agent.c,v 1.27 2019/10/12 18:32:22 christos Exp $"); 40 41 #include <sys/param.h> /* MIN MAX */ 42 #include <sys/types.h> 43 #include <sys/time.h> 44 #include <sys/queue.h> 45 #include <sys/resource.h> 46 #include <sys/socket.h> 47 #include <sys/stat.h> 48 #include <sys/un.h> 49 50 #ifdef WITH_OPENSSL 51 #include <openssl/evp.h> 52 #endif 53 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <paths.h> 57 #include <poll.h> 58 #include <signal.h> 59 #include <stdlib.h> 60 #include <stdio.h> 61 #include <string.h> 62 #include <limits.h> 63 #include <time.h> 64 #include <unistd.h> 65 #include <util.h> 66 67 #include "xmalloc.h" 68 #include "ssh.h" 69 #include "sshbuf.h" 70 #include "sshkey.h" 71 #include "authfd.h" 72 #include "compat.h" 73 #include "log.h" 74 #include "misc.h" 75 #include "getpeereid.h" 76 #include "digest.h" 77 #include "ssherr.h" 78 #include "match.h" 79 80 #ifdef ENABLE_PKCS11 81 #include "ssh-pkcs11.h" 82 #endif 83 84 #ifndef DEFAULT_PKCS11_WHITELIST 85 # define DEFAULT_PKCS11_WHITELIST "/usr/lib*/*,/usr/pkg/lib*/*" 86 #endif 87 88 /* Maximum accepted message length */ 89 #define AGENT_MAX_LEN (256*1024) 90 /* Maximum bytes to read from client socket */ 91 #define AGENT_RBUF_LEN (4096) 92 93 typedef enum { 94 AUTH_UNUSED, 95 AUTH_SOCKET, 96 AUTH_CONNECTION 97 } sock_type; 98 99 typedef struct { 100 int fd; 101 sock_type type; 102 struct sshbuf *input; 103 struct sshbuf *output; 104 struct sshbuf *request; 105 } SocketEntry; 106 107 u_int sockets_alloc = 0; 108 SocketEntry *sockets = NULL; 109 110 typedef struct identity { 111 TAILQ_ENTRY(identity) next; 112 struct sshkey *key; 113 char *comment; 114 char *provider; 115 time_t death; 116 u_int confirm; 117 } Identity; 118 119 struct idtable { 120 int nentries; 121 TAILQ_HEAD(idqueue, identity) idlist; 122 }; 123 124 /* private key table */ 125 struct idtable *idtab; 126 127 int max_fd = 0; 128 129 /* pid of shell == parent of agent */ 130 pid_t parent_pid = -1; 131 time_t parent_alive_interval = 0; 132 133 /* pid of process for which cleanup_socket is applicable */ 134 pid_t cleanup_pid = 0; 135 136 /* pathname and directory for AUTH_SOCKET */ 137 char socket_name[PATH_MAX]; 138 char socket_dir[PATH_MAX]; 139 140 /* PKCS#11 path whitelist */ 141 static char *pkcs11_whitelist; 142 143 /* locking */ 144 #define LOCK_SIZE 32 145 #define LOCK_SALT_SIZE 16 146 #define LOCK_ROUNDS 1 147 int locked = 0; 148 u_char lock_pwhash[LOCK_SIZE]; 149 u_char lock_salt[LOCK_SALT_SIZE]; 150 151 extern char *__progname; 152 153 /* Default lifetime in seconds (0 == forever) */ 154 static long lifetime = 0; 155 156 static int fingerprint_hash = SSH_FP_HASH_DEFAULT; 157 158 static void 159 close_socket(SocketEntry *e) 160 { 161 close(e->fd); 162 e->fd = -1; 163 e->type = AUTH_UNUSED; 164 sshbuf_free(e->input); 165 sshbuf_free(e->output); 166 sshbuf_free(e->request); 167 } 168 169 static void 170 idtab_init(void) 171 { 172 idtab = xcalloc(1, sizeof(*idtab)); 173 TAILQ_INIT(&idtab->idlist); 174 idtab->nentries = 0; 175 } 176 177 static void 178 free_identity(Identity *id) 179 { 180 sshkey_free(id->key); 181 free(id->provider); 182 free(id->comment); 183 free(id); 184 } 185 186 /* return matching private key for given public key */ 187 static Identity * 188 lookup_identity(struct sshkey *key) 189 { 190 Identity *id; 191 192 TAILQ_FOREACH(id, &idtab->idlist, next) { 193 if (sshkey_equal(key, id->key)) 194 return (id); 195 } 196 return (NULL); 197 } 198 199 /* Check confirmation of keysign request */ 200 static int 201 confirm_key(Identity *id) 202 { 203 char *p; 204 int ret = -1; 205 206 p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT); 207 if (p != NULL && 208 ask_permission("Allow use of key %s?\nKey fingerprint %s.", 209 id->comment, p)) 210 ret = 0; 211 free(p); 212 213 return (ret); 214 } 215 216 static void 217 send_status(SocketEntry *e, int success) 218 { 219 int r; 220 221 if ((r = sshbuf_put_u32(e->output, 1)) != 0 || 222 (r = sshbuf_put_u8(e->output, success ? 223 SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0) 224 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 225 } 226 227 /* send list of supported public keys to 'client' */ 228 static void 229 process_request_identities(SocketEntry *e) 230 { 231 Identity *id; 232 struct sshbuf *msg; 233 int r; 234 235 if ((msg = sshbuf_new()) == NULL) 236 fatal("%s: sshbuf_new failed", __func__); 237 if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 || 238 (r = sshbuf_put_u32(msg, idtab->nentries)) != 0) 239 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 240 TAILQ_FOREACH(id, &idtab->idlist, next) { 241 if ((r = sshkey_puts_opts(id->key, msg, SSHKEY_SERIALIZE_INFO)) 242 != 0 || 243 (r = sshbuf_put_cstring(msg, id->comment)) != 0) { 244 error("%s: put key/comment: %s", __func__, 245 ssh_err(r)); 246 continue; 247 } 248 } 249 if ((r = sshbuf_put_stringb(e->output, msg)) != 0) 250 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 251 sshbuf_free(msg); 252 } 253 254 255 static const char * 256 agent_decode_alg(struct sshkey *key, u_int flags) 257 { 258 if (key->type == KEY_RSA) { 259 if (flags & SSH_AGENT_RSA_SHA2_256) 260 return "rsa-sha2-256"; 261 else if (flags & SSH_AGENT_RSA_SHA2_512) 262 return "rsa-sha2-512"; 263 } else if (key->type == KEY_RSA_CERT) { 264 if (flags & SSH_AGENT_RSA_SHA2_256) 265 return "rsa-sha2-256-cert-v01@openssh.com"; 266 else if (flags & SSH_AGENT_RSA_SHA2_512) 267 return "rsa-sha2-512-cert-v01@openssh.com"; 268 } 269 return NULL; 270 } 271 272 /* ssh2 only */ 273 static void 274 process_sign_request2(SocketEntry *e) 275 { 276 const u_char *data; 277 u_char *signature = NULL; 278 size_t dlen, slen = 0; 279 u_int compat = 0, flags; 280 int r, ok = -1; 281 struct sshbuf *msg; 282 struct sshkey *key = NULL; 283 struct identity *id; 284 285 if ((msg = sshbuf_new()) == NULL) 286 fatal("%s: sshbuf_new failed", __func__); 287 if ((r = sshkey_froms(e->request, &key)) != 0 || 288 (r = sshbuf_get_string_direct(e->request, &data, &dlen)) != 0 || 289 (r = sshbuf_get_u32(e->request, &flags)) != 0) { 290 error("%s: couldn't parse request: %s", __func__, ssh_err(r)); 291 goto send; 292 } 293 294 if ((id = lookup_identity(key)) == NULL) { 295 verbose("%s: %s key not found", __func__, sshkey_type(key)); 296 goto send; 297 } 298 if (id->confirm && confirm_key(id) != 0) { 299 verbose("%s: user refused key", __func__); 300 goto send; 301 } 302 if ((r = sshkey_sign(id->key, &signature, &slen, 303 data, dlen, agent_decode_alg(key, flags), compat)) != 0) { 304 error("%s: sshkey_sign: %s", __func__, ssh_err(r)); 305 goto send; 306 } 307 /* Success */ 308 ok = 0; 309 send: 310 sshkey_free(key); 311 if (ok == 0) { 312 if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 || 313 (r = sshbuf_put_string(msg, signature, slen)) != 0) 314 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 315 } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0) 316 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 317 318 if ((r = sshbuf_put_stringb(e->output, msg)) != 0) 319 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 320 321 sshbuf_free(msg); 322 free(signature); 323 } 324 325 /* shared */ 326 static void 327 process_remove_identity(SocketEntry *e) 328 { 329 int r, success = 0; 330 struct sshkey *key = NULL; 331 Identity *id; 332 333 if ((r = sshkey_froms(e->request, &key)) != 0) { 334 error("%s: get key: %s", __func__, ssh_err(r)); 335 goto done; 336 } 337 if ((id = lookup_identity(key)) == NULL) { 338 debug("%s: key not found", __func__); 339 goto done; 340 } 341 /* We have this key, free it. */ 342 if (idtab->nentries < 1) 343 fatal("%s: internal error: nentries %d", 344 __func__, idtab->nentries); 345 TAILQ_REMOVE(&idtab->idlist, id, next); 346 free_identity(id); 347 idtab->nentries--; 348 sshkey_free(key); 349 success = 1; 350 done: 351 send_status(e, success); 352 } 353 354 static void 355 process_remove_all_identities(SocketEntry *e) 356 { 357 Identity *id; 358 359 /* Loop over all identities and clear the keys. */ 360 for (id = TAILQ_FIRST(&idtab->idlist); id; 361 id = TAILQ_FIRST(&idtab->idlist)) { 362 TAILQ_REMOVE(&idtab->idlist, id, next); 363 free_identity(id); 364 } 365 366 /* Mark that there are no identities. */ 367 idtab->nentries = 0; 368 369 /* Send success. */ 370 send_status(e, 1); 371 } 372 373 /* removes expired keys and returns number of seconds until the next expiry */ 374 static time_t 375 reaper(void) 376 { 377 time_t deadline = 0, now = monotime(); 378 Identity *id, *nxt; 379 380 for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) { 381 nxt = TAILQ_NEXT(id, next); 382 if (id->death == 0) 383 continue; 384 if (now >= id->death) { 385 debug("expiring key '%s'", id->comment); 386 TAILQ_REMOVE(&idtab->idlist, id, next); 387 free_identity(id); 388 idtab->nentries--; 389 } else 390 deadline = (deadline == 0) ? id->death : 391 MINIMUM(deadline, id->death); 392 } 393 if (deadline == 0 || deadline <= now) 394 return 0; 395 else 396 return (deadline - now); 397 } 398 399 static void 400 process_add_identity(SocketEntry *e) 401 { 402 Identity *id; 403 int success = 0, confirm = 0; 404 u_int seconds, maxsign; 405 char *comment = NULL; 406 time_t death = 0; 407 struct sshkey *k = NULL; 408 u_char ctype; 409 int r = SSH_ERR_INTERNAL_ERROR; 410 411 if ((r = sshkey_private_deserialize(e->request, &k)) != 0 || 412 k == NULL || 413 (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) { 414 error("%s: decode private key: %s", __func__, ssh_err(r)); 415 goto err; 416 } 417 if ((r = sshkey_shield_private(k)) != 0) { 418 error("%s: shield private key: %s", __func__, ssh_err(r)); 419 goto err; 420 } 421 while (sshbuf_len(e->request)) { 422 if ((r = sshbuf_get_u8(e->request, &ctype)) != 0) { 423 error("%s: buffer error: %s", __func__, ssh_err(r)); 424 goto err; 425 } 426 switch (ctype) { 427 case SSH_AGENT_CONSTRAIN_LIFETIME: 428 if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) { 429 error("%s: bad lifetime constraint: %s", 430 __func__, ssh_err(r)); 431 goto err; 432 } 433 death = monotime() + seconds; 434 break; 435 case SSH_AGENT_CONSTRAIN_CONFIRM: 436 confirm = 1; 437 break; 438 case SSH_AGENT_CONSTRAIN_MAXSIGN: 439 if ((r = sshbuf_get_u32(e->request, &maxsign)) != 0) { 440 error("%s: bad maxsign constraint: %s", 441 __func__, ssh_err(r)); 442 goto err; 443 } 444 if ((r = sshkey_enable_maxsign(k, maxsign)) != 0) { 445 error("%s: cannot enable maxsign: %s", 446 __func__, ssh_err(r)); 447 goto err; 448 } 449 break; 450 default: 451 error("%s: Unknown constraint %d", __func__, ctype); 452 err: 453 sshbuf_reset(e->request); 454 free(comment); 455 sshkey_free(k); 456 goto send; 457 } 458 } 459 460 success = 1; 461 if (lifetime && !death) 462 death = monotime() + lifetime; 463 if ((id = lookup_identity(k)) == NULL) { 464 id = xcalloc(1, sizeof(Identity)); 465 TAILQ_INSERT_TAIL(&idtab->idlist, id, next); 466 /* Increment the number of identities. */ 467 idtab->nentries++; 468 } else { 469 /* key state might have been updated */ 470 sshkey_free(id->key); 471 free(id->comment); 472 } 473 id->key = k; 474 id->comment = comment; 475 id->death = death; 476 id->confirm = confirm; 477 send: 478 send_status(e, success); 479 } 480 481 /* XXX todo: encrypt sensitive data with passphrase */ 482 static void 483 process_lock_agent(SocketEntry *e, int lock) 484 { 485 int r, success = 0, delay; 486 char *passwd; 487 u_char passwdhash[LOCK_SIZE]; 488 static u_int fail_count = 0; 489 size_t pwlen; 490 491 /* 492 * This is deliberately fatal: the user has requested that we lock, 493 * but we can't parse their request properly. The only safe thing to 494 * do is abort. 495 */ 496 if ((r = sshbuf_get_cstring(e->request, &passwd, &pwlen)) != 0) 497 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 498 if (pwlen == 0) { 499 debug("empty password not supported"); 500 } else if (locked && !lock) { 501 if (bcrypt_pbkdf(passwd, pwlen, (uint8_t *)lock_salt, sizeof(lock_salt), 502 (uint8_t *)passwdhash, sizeof(passwdhash), LOCK_ROUNDS) < 0) 503 fatal("bcrypt_pbkdf"); 504 if (timingsafe_bcmp(passwdhash, lock_pwhash, LOCK_SIZE) == 0) { 505 debug("agent unlocked"); 506 locked = 0; 507 fail_count = 0; 508 explicit_bzero(lock_pwhash, sizeof(lock_pwhash)); 509 success = 1; 510 } else { 511 /* delay in 0.1s increments up to 10s */ 512 if (fail_count < 100) 513 fail_count++; 514 delay = 100000 * fail_count; 515 debug("unlock failed, delaying %0.1lf seconds", 516 (double)delay/1000000); 517 usleep(delay); 518 } 519 explicit_bzero(passwdhash, sizeof(passwdhash)); 520 } else if (!locked && lock) { 521 debug("agent locked"); 522 locked = 1; 523 arc4random_buf(lock_salt, sizeof(lock_salt)); 524 if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt), 525 lock_pwhash, sizeof(lock_pwhash), LOCK_ROUNDS) < 0) 526 fatal("bcrypt_pbkdf"); 527 success = 1; 528 } 529 explicit_bzero(passwd, pwlen); 530 free(passwd); 531 send_status(e, success); 532 } 533 534 static void 535 no_identities(SocketEntry *e) 536 { 537 struct sshbuf *msg; 538 int r; 539 540 if ((msg = sshbuf_new()) == NULL) 541 fatal("%s: sshbuf_new failed", __func__); 542 if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 || 543 (r = sshbuf_put_u32(msg, 0)) != 0 || 544 (r = sshbuf_put_stringb(e->output, msg)) != 0) 545 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 546 sshbuf_free(msg); 547 } 548 549 #ifdef ENABLE_PKCS11 550 static void 551 process_add_smartcard_key(SocketEntry *e) 552 { 553 char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX]; 554 int r, i, count = 0, success = 0, confirm = 0; 555 u_int seconds; 556 time_t death = 0; 557 u_char type; 558 struct sshkey **keys = NULL, *k; 559 Identity *id; 560 561 if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 || 562 (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) { 563 error("%s: buffer error: %s", __func__, ssh_err(r)); 564 goto send; 565 } 566 567 while (sshbuf_len(e->request)) { 568 if ((r = sshbuf_get_u8(e->request, &type)) != 0) { 569 error("%s: buffer error: %s", __func__, ssh_err(r)); 570 goto send; 571 } 572 switch (type) { 573 case SSH_AGENT_CONSTRAIN_LIFETIME: 574 if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) { 575 error("%s: buffer error: %s", 576 __func__, ssh_err(r)); 577 goto send; 578 } 579 death = monotime() + seconds; 580 break; 581 case SSH_AGENT_CONSTRAIN_CONFIRM: 582 confirm = 1; 583 break; 584 default: 585 error("%s: Unknown constraint type %d", __func__, type); 586 goto send; 587 } 588 } 589 if (realpath(provider, canonical_provider) == NULL) { 590 verbose("failed PKCS#11 add of \"%.100s\": realpath: %s", 591 provider, strerror(errno)); 592 goto send; 593 } 594 if (match_pattern_list(canonical_provider, pkcs11_whitelist, 0) != 1) { 595 verbose("refusing PKCS#11 add of \"%.100s\": " 596 "provider not whitelisted", canonical_provider); 597 goto send; 598 } 599 debug("%s: add %.100s", __func__, canonical_provider); 600 if (lifetime && !death) 601 death = monotime() + lifetime; 602 603 count = pkcs11_add_provider(canonical_provider, pin, &keys); 604 for (i = 0; i < count; i++) { 605 k = keys[i]; 606 if (lookup_identity(k) == NULL) { 607 id = xcalloc(1, sizeof(Identity)); 608 id->key = k; 609 id->provider = xstrdup(canonical_provider); 610 id->comment = xstrdup(canonical_provider); /* XXX */ 611 id->death = death; 612 id->confirm = confirm; 613 TAILQ_INSERT_TAIL(&idtab->idlist, id, next); 614 idtab->nentries++; 615 success = 1; 616 } else { 617 sshkey_free(k); 618 } 619 keys[i] = NULL; 620 } 621 send: 622 free(pin); 623 free(provider); 624 free(keys); 625 send_status(e, success); 626 } 627 628 static void 629 process_remove_smartcard_key(SocketEntry *e) 630 { 631 char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX]; 632 int r, success = 0; 633 Identity *id, *nxt; 634 635 if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 || 636 (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) { 637 error("%s: buffer error: %s", __func__, ssh_err(r)); 638 goto send; 639 } 640 free(pin); 641 642 if (realpath(provider, canonical_provider) == NULL) { 643 verbose("failed PKCS#11 add of \"%.100s\": realpath: %s", 644 provider, strerror(errno)); 645 goto send; 646 } 647 648 debug("%s: remove %.100s", __func__, canonical_provider); 649 for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) { 650 nxt = TAILQ_NEXT(id, next); 651 /* Skip file--based keys */ 652 if (id->provider == NULL) 653 continue; 654 if (!strcmp(canonical_provider, id->provider)) { 655 TAILQ_REMOVE(&idtab->idlist, id, next); 656 free_identity(id); 657 idtab->nentries--; 658 } 659 } 660 if (pkcs11_del_provider(canonical_provider) == 0) 661 success = 1; 662 else 663 error("%s: pkcs11_del_provider failed", __func__); 664 send: 665 free(provider); 666 send_status(e, success); 667 } 668 #endif /* ENABLE_PKCS11 */ 669 670 /* dispatch incoming messages */ 671 672 static int 673 process_message(u_int socknum) 674 { 675 u_int msg_len; 676 u_char type; 677 const u_char *cp; 678 int r; 679 SocketEntry *e; 680 681 if (socknum >= sockets_alloc) { 682 fatal("%s: socket number %u >= allocated %u", 683 __func__, socknum, sockets_alloc); 684 } 685 e = &sockets[socknum]; 686 687 if (sshbuf_len(e->input) < 5) 688 return 0; /* Incomplete message header. */ 689 cp = sshbuf_ptr(e->input); 690 msg_len = PEEK_U32(cp); 691 if (msg_len > AGENT_MAX_LEN) { 692 debug("%s: socket %u (fd=%d) message too long %u > %u", 693 __func__, socknum, e->fd, msg_len, AGENT_MAX_LEN); 694 return -1; 695 } 696 if (sshbuf_len(e->input) < msg_len + 4) 697 return 0; /* Incomplete message body. */ 698 699 /* move the current input to e->request */ 700 sshbuf_reset(e->request); 701 if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 || 702 (r = sshbuf_get_u8(e->request, &type)) != 0) { 703 if (r == SSH_ERR_MESSAGE_INCOMPLETE || 704 r == SSH_ERR_STRING_TOO_LARGE) { 705 debug("%s: buffer error: %s", __func__, ssh_err(r)); 706 return -1; 707 } 708 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 709 } 710 711 debug("%s: socket %u (fd=%d) type %d", __func__, socknum, e->fd, type); 712 713 /* check whether agent is locked */ 714 if (locked && type != SSH_AGENTC_UNLOCK) { 715 sshbuf_reset(e->request); 716 switch (type) { 717 case SSH2_AGENTC_REQUEST_IDENTITIES: 718 /* send empty lists */ 719 no_identities(e); 720 break; 721 default: 722 /* send a fail message for all other request types */ 723 send_status(e, 0); 724 } 725 return 0; 726 } 727 728 switch (type) { 729 case SSH_AGENTC_LOCK: 730 case SSH_AGENTC_UNLOCK: 731 process_lock_agent(e, type == SSH_AGENTC_LOCK); 732 break; 733 case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: 734 process_remove_all_identities(e); /* safe for !WITH_SSH1 */ 735 break; 736 /* ssh2 */ 737 case SSH2_AGENTC_SIGN_REQUEST: 738 process_sign_request2(e); 739 break; 740 case SSH2_AGENTC_REQUEST_IDENTITIES: 741 process_request_identities(e); 742 break; 743 case SSH2_AGENTC_ADD_IDENTITY: 744 case SSH2_AGENTC_ADD_ID_CONSTRAINED: 745 process_add_identity(e); 746 break; 747 case SSH2_AGENTC_REMOVE_IDENTITY: 748 process_remove_identity(e); 749 break; 750 case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: 751 process_remove_all_identities(e); 752 break; 753 #ifdef ENABLE_PKCS11 754 case SSH_AGENTC_ADD_SMARTCARD_KEY: 755 case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: 756 process_add_smartcard_key(e); 757 break; 758 case SSH_AGENTC_REMOVE_SMARTCARD_KEY: 759 process_remove_smartcard_key(e); 760 break; 761 #endif /* ENABLE_PKCS11 */ 762 default: 763 /* Unknown message. Respond with failure. */ 764 error("Unknown message %d", type); 765 sshbuf_reset(e->request); 766 send_status(e, 0); 767 break; 768 } 769 return 0; 770 } 771 772 static void 773 new_socket(sock_type type, int fd) 774 { 775 u_int i, old_alloc, new_alloc; 776 777 set_nonblock(fd); 778 779 if (fd > max_fd) 780 max_fd = fd; 781 782 for (i = 0; i < sockets_alloc; i++) 783 if (sockets[i].type == AUTH_UNUSED) { 784 sockets[i].fd = fd; 785 if ((sockets[i].input = sshbuf_new()) == NULL) 786 fatal("%s: sshbuf_new failed", __func__); 787 if ((sockets[i].output = sshbuf_new()) == NULL) 788 fatal("%s: sshbuf_new failed", __func__); 789 if ((sockets[i].request = sshbuf_new()) == NULL) 790 fatal("%s: sshbuf_new failed", __func__); 791 sockets[i].type = type; 792 return; 793 } 794 old_alloc = sockets_alloc; 795 new_alloc = sockets_alloc + 10; 796 sockets = xreallocarray(sockets, new_alloc, sizeof(sockets[0])); 797 for (i = old_alloc; i < new_alloc; i++) 798 sockets[i].type = AUTH_UNUSED; 799 sockets_alloc = new_alloc; 800 sockets[old_alloc].fd = fd; 801 if ((sockets[old_alloc].input = sshbuf_new()) == NULL) 802 fatal("%s: sshbuf_new failed", __func__); 803 if ((sockets[old_alloc].output = sshbuf_new()) == NULL) 804 fatal("%s: sshbuf_new failed", __func__); 805 if ((sockets[old_alloc].request = sshbuf_new()) == NULL) 806 fatal("%s: sshbuf_new failed", __func__); 807 sockets[old_alloc].type = type; 808 } 809 810 static int 811 handle_socket_read(u_int socknum) 812 { 813 struct sockaddr_un sunaddr; 814 socklen_t slen; 815 uid_t euid; 816 gid_t egid; 817 int fd; 818 819 slen = sizeof(sunaddr); 820 fd = accept(sockets[socknum].fd, (struct sockaddr *)&sunaddr, &slen); 821 if (fd == -1) { 822 error("accept from AUTH_SOCKET: %s", strerror(errno)); 823 return -1; 824 } 825 if (getpeereid(fd, &euid, &egid) == -1) { 826 error("getpeereid %d failed: %s", fd, strerror(errno)); 827 close(fd); 828 return -1; 829 } 830 if ((euid != 0) && (getuid() != euid)) { 831 error("uid mismatch: peer euid %u != uid %u", 832 (u_int) euid, (u_int) getuid()); 833 close(fd); 834 return -1; 835 } 836 new_socket(AUTH_CONNECTION, fd); 837 return 0; 838 } 839 840 static int 841 handle_conn_read(u_int socknum) 842 { 843 char buf[AGENT_RBUF_LEN]; 844 ssize_t len; 845 int r; 846 847 if ((len = read(sockets[socknum].fd, buf, sizeof(buf))) <= 0) { 848 if (len == -1) { 849 if (errno == EAGAIN || errno == EINTR) 850 return 0; 851 error("%s: read error on socket %u (fd %d): %s", 852 __func__, socknum, sockets[socknum].fd, 853 strerror(errno)); 854 } 855 return -1; 856 } 857 if ((r = sshbuf_put(sockets[socknum].input, buf, len)) != 0) 858 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 859 explicit_bzero(buf, sizeof(buf)); 860 process_message(socknum); 861 return 0; 862 } 863 864 static int 865 handle_conn_write(u_int socknum) 866 { 867 ssize_t len; 868 int r; 869 870 if (sshbuf_len(sockets[socknum].output) == 0) 871 return 0; /* shouldn't happen */ 872 if ((len = write(sockets[socknum].fd, 873 sshbuf_ptr(sockets[socknum].output), 874 sshbuf_len(sockets[socknum].output))) <= 0) { 875 if (len == -1) { 876 if (errno == EAGAIN || errno == EINTR) 877 return 0; 878 error("%s: read error on socket %u (fd %d): %s", 879 __func__, socknum, sockets[socknum].fd, 880 strerror(errno)); 881 } 882 return -1; 883 } 884 if ((r = sshbuf_consume(sockets[socknum].output, len)) != 0) 885 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 886 return 0; 887 } 888 889 static void 890 after_poll(struct pollfd *pfd, size_t npfd, u_int maxfds) 891 { 892 size_t i; 893 u_int socknum, activefds = npfd; 894 895 for (i = 0; i < npfd; i++) { 896 if (pfd[i].revents == 0) 897 continue; 898 /* Find sockets entry */ 899 for (socknum = 0; socknum < sockets_alloc; socknum++) { 900 if (sockets[socknum].type != AUTH_SOCKET && 901 sockets[socknum].type != AUTH_CONNECTION) 902 continue; 903 if (pfd[i].fd == sockets[socknum].fd) 904 break; 905 } 906 if (socknum >= sockets_alloc) { 907 error("%s: no socket for fd %d", __func__, pfd[i].fd); 908 continue; 909 } 910 /* Process events */ 911 switch (sockets[socknum].type) { 912 case AUTH_SOCKET: 913 if ((pfd[i].revents & (POLLIN|POLLERR)) == 0) 914 break; 915 if (npfd > maxfds) { 916 debug3("out of fds (active %u >= limit %u); " 917 "skipping accept", activefds, maxfds); 918 break; 919 } 920 if (handle_socket_read(socknum) == 0) 921 activefds++; 922 break; 923 case AUTH_CONNECTION: 924 if ((pfd[i].revents & (POLLIN|POLLERR)) != 0 && 925 handle_conn_read(socknum) != 0) { 926 goto close_sock; 927 } 928 if ((pfd[i].revents & (POLLOUT|POLLHUP)) != 0 && 929 handle_conn_write(socknum) != 0) { 930 close_sock: 931 if (activefds == 0) 932 fatal("activefds == 0 at close_sock"); 933 close_socket(&sockets[socknum]); 934 activefds--; 935 break; 936 } 937 break; 938 default: 939 break; 940 } 941 } 942 } 943 944 static int 945 prepare_poll(struct pollfd **pfdp, size_t *npfdp, int *timeoutp, u_int maxfds) 946 { 947 struct pollfd *pfd = *pfdp; 948 size_t i, j, npfd = 0; 949 time_t deadline; 950 int r; 951 952 /* Count active sockets */ 953 for (i = 0; i < sockets_alloc; i++) { 954 switch (sockets[i].type) { 955 case AUTH_SOCKET: 956 case AUTH_CONNECTION: 957 npfd++; 958 break; 959 case AUTH_UNUSED: 960 break; 961 default: 962 fatal("Unknown socket type %d", sockets[i].type); 963 break; 964 } 965 } 966 if (npfd != *npfdp && 967 (pfd = recallocarray(pfd, *npfdp, npfd, sizeof(*pfd))) == NULL) 968 fatal("%s: recallocarray failed", __func__); 969 *pfdp = pfd; 970 *npfdp = npfd; 971 972 for (i = j = 0; i < sockets_alloc; i++) { 973 switch (sockets[i].type) { 974 case AUTH_SOCKET: 975 if (npfd > maxfds) { 976 debug3("out of fds (active %zu >= limit %u); " 977 "skipping arming listener", npfd, maxfds); 978 break; 979 } 980 pfd[j].fd = sockets[i].fd; 981 pfd[j].revents = 0; 982 pfd[j].events = POLLIN; 983 j++; 984 break; 985 case AUTH_CONNECTION: 986 pfd[j].fd = sockets[i].fd; 987 pfd[j].revents = 0; 988 /* 989 * Only prepare to read if we can handle a full-size 990 * input read buffer and enqueue a max size reply.. 991 */ 992 if ((r = sshbuf_check_reserve(sockets[i].input, 993 AGENT_RBUF_LEN)) == 0 && 994 (r = sshbuf_check_reserve(sockets[i].output, 995 AGENT_MAX_LEN)) == 0) 996 pfd[j].events = POLLIN; 997 else if (r != SSH_ERR_NO_BUFFER_SPACE) { 998 fatal("%s: buffer error: %s", 999 __func__, ssh_err(r)); 1000 } 1001 if (sshbuf_len(sockets[i].output) > 0) 1002 pfd[j].events |= POLLOUT; 1003 j++; 1004 break; 1005 default: 1006 break; 1007 } 1008 } 1009 deadline = reaper(); 1010 if (parent_alive_interval != 0) 1011 deadline = (deadline == 0) ? parent_alive_interval : 1012 MINIMUM(deadline, parent_alive_interval); 1013 if (deadline == 0) { 1014 *timeoutp = -1; /* INFTIM */ 1015 } else { 1016 if (deadline > INT_MAX / 1000) 1017 *timeoutp = INT_MAX / 1000; 1018 else 1019 *timeoutp = deadline * 1000; 1020 } 1021 return (1); 1022 } 1023 1024 static void 1025 cleanup_socket(void) 1026 { 1027 if (cleanup_pid != 0 && getpid() != cleanup_pid) 1028 return; 1029 debug("%s: cleanup", __func__); 1030 if (socket_name[0]) 1031 unlink(socket_name); 1032 if (socket_dir[0]) 1033 rmdir(socket_dir); 1034 } 1035 1036 void 1037 cleanup_exit(int i) 1038 { 1039 cleanup_socket(); 1040 _exit(i); 1041 } 1042 1043 /*ARGSUSED*/ 1044 __dead static void 1045 cleanup_handler(int sig) 1046 { 1047 cleanup_socket(); 1048 #ifdef ENABLE_PKCS11 1049 pkcs11_terminate(); 1050 #endif 1051 _exit(2); 1052 } 1053 1054 static void 1055 check_parent_exists(void) 1056 { 1057 /* 1058 * If our parent has exited then getppid() will return (pid_t)1, 1059 * so testing for that should be safe. 1060 */ 1061 if (parent_pid != -1 && getppid() != parent_pid) { 1062 /* printf("Parent has died - Authentication agent exiting.\n"); */ 1063 cleanup_socket(); 1064 _exit(2); 1065 } 1066 } 1067 1068 __dead static void 1069 usage(void) 1070 { 1071 fprintf(stderr, 1072 "usage: ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]\n" 1073 " [-P pkcs11_whitelist] [-t life] [command [arg ...]]\n" 1074 " ssh-agent [-c | -s] -k\n"); 1075 exit(1); 1076 } 1077 1078 static void 1079 csh_setenv(const char *name, const char *value) 1080 { 1081 printf("setenv %s %s;\n", name, value); 1082 } 1083 1084 static void 1085 csh_unsetenv(const char *name) 1086 { 1087 printf("unsetenv %s;\n", name); 1088 } 1089 1090 static void 1091 sh_setenv(const char *name, const char *value) 1092 { 1093 printf("%s=%s; export %s;\n", name, value, name); 1094 } 1095 1096 static void 1097 sh_unsetenv(const char *name) 1098 { 1099 printf("unset %s;\n", name); 1100 } 1101 int 1102 main(int ac, char **av) 1103 { 1104 int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0; 1105 int sock, fd, ch, result, saved_errno; 1106 char *shell, *pidstr, *agentsocket = NULL; 1107 struct rlimit rlim; 1108 void (*f_setenv)(const char *, const char *); 1109 void (*f_unsetenv)(const char *); 1110 extern int optind; 1111 extern char *optarg; 1112 pid_t pid; 1113 char pidstrbuf[1 + 3 * sizeof pid]; 1114 size_t len; 1115 mode_t prev_mask; 1116 int timeout = -1; /* INFTIM */ 1117 struct pollfd *pfd = NULL; 1118 size_t npfd = 0; 1119 u_int maxfds; 1120 1121 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1122 sanitise_stdfd(); 1123 1124 /* drop */ 1125 setegid(getgid()); 1126 setgid(getgid()); 1127 1128 if (getrlimit(RLIMIT_NOFILE, &rlim) == -1) 1129 fatal("%s: getrlimit: %s", __progname, strerror(errno)); 1130 1131 #ifdef WITH_OPENSSL 1132 OpenSSL_add_all_algorithms(); 1133 #endif 1134 1135 while ((ch = getopt(ac, av, "cDdksE:a:P:t:")) != -1) { 1136 switch (ch) { 1137 case 'E': 1138 fingerprint_hash = ssh_digest_alg_by_name(optarg); 1139 if (fingerprint_hash == -1) 1140 fatal("Invalid hash algorithm \"%s\"", optarg); 1141 break; 1142 case 'c': 1143 if (s_flag) 1144 usage(); 1145 c_flag++; 1146 break; 1147 case 'k': 1148 k_flag++; 1149 break; 1150 case 'P': 1151 if (pkcs11_whitelist != NULL) 1152 fatal("-P option already specified"); 1153 pkcs11_whitelist = xstrdup(optarg); 1154 break; 1155 case 's': 1156 if (c_flag) 1157 usage(); 1158 s_flag++; 1159 break; 1160 case 'd': 1161 if (d_flag || D_flag) 1162 usage(); 1163 d_flag++; 1164 break; 1165 case 'D': 1166 if (d_flag || D_flag) 1167 usage(); 1168 D_flag++; 1169 break; 1170 case 'a': 1171 agentsocket = optarg; 1172 break; 1173 case 't': 1174 if ((lifetime = convtime(optarg)) == -1) { 1175 fprintf(stderr, "Invalid lifetime\n"); 1176 usage(); 1177 } 1178 break; 1179 default: 1180 usage(); 1181 } 1182 } 1183 ac -= optind; 1184 av += optind; 1185 1186 if (ac > 0 && (c_flag || k_flag || s_flag || d_flag || D_flag)) 1187 usage(); 1188 1189 if (pkcs11_whitelist == NULL) 1190 pkcs11_whitelist = xstrdup(DEFAULT_PKCS11_WHITELIST); 1191 1192 if (ac == 0 && !c_flag && !s_flag) { 1193 shell = getenv("SHELL"); 1194 if (shell != NULL && (len = strlen(shell)) > 2 && 1195 strncmp(shell + len - 3, "csh", 3) == 0) 1196 c_flag = 1; 1197 } 1198 if (c_flag) { 1199 f_setenv = csh_setenv; 1200 f_unsetenv = csh_unsetenv; 1201 } else { 1202 f_setenv = sh_setenv; 1203 f_unsetenv = sh_unsetenv; 1204 } 1205 if (k_flag) { 1206 const char *errstr = NULL; 1207 1208 pidstr = getenv(SSH_AGENTPID_ENV_NAME); 1209 if (pidstr == NULL) { 1210 fprintf(stderr, "%s not set, cannot kill agent\n", 1211 SSH_AGENTPID_ENV_NAME); 1212 exit(1); 1213 } 1214 pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); 1215 if (errstr) { 1216 fprintf(stderr, 1217 "%s=\"%s\", which is not a good PID: %s\n", 1218 SSH_AGENTPID_ENV_NAME, pidstr, errstr); 1219 exit(1); 1220 } 1221 if (kill(pid, SIGTERM) == -1) { 1222 perror("kill"); 1223 exit(1); 1224 } 1225 (*f_unsetenv)(SSH_AUTHSOCKET_ENV_NAME); 1226 (*f_unsetenv)(SSH_AGENTPID_ENV_NAME); 1227 printf("echo Agent pid %ld killed;\n", (long)pid); 1228 exit(0); 1229 } 1230 1231 /* 1232 * Minimum file descriptors: 1233 * stdio (3) + listener (1) + syslog (1 maybe) + connection (1) + 1234 * a few spare for libc / stack protectors / sanitisers, etc. 1235 */ 1236 #define SSH_AGENT_MIN_FDS (3+1+1+1+4) 1237 if (rlim.rlim_cur < SSH_AGENT_MIN_FDS) 1238 fatal("%s: file descriptor rlimit %lld too low (minimum %u)", 1239 __progname, (long long)rlim.rlim_cur, SSH_AGENT_MIN_FDS); 1240 maxfds = rlim.rlim_cur - SSH_AGENT_MIN_FDS; 1241 1242 parent_pid = getpid(); 1243 1244 if (agentsocket == NULL) { 1245 /* Create private directory for agent socket */ 1246 mktemp_proto(socket_dir, sizeof(socket_dir)); 1247 if (mkdtemp(socket_dir) == NULL) { 1248 perror("mkdtemp: private socket dir"); 1249 exit(1); 1250 } 1251 snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, 1252 (long)parent_pid); 1253 } else { 1254 /* Try to use specified agent socket */ 1255 socket_dir[0] = '\0'; 1256 strlcpy(socket_name, agentsocket, sizeof socket_name); 1257 } 1258 1259 /* 1260 * Create socket early so it will exist before command gets run from 1261 * the parent. 1262 */ 1263 prev_mask = umask(0177); 1264 sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0); 1265 if (sock < 0) { 1266 /* XXX - unix_listener() calls error() not perror() */ 1267 *socket_name = '\0'; /* Don't unlink any existing file */ 1268 cleanup_exit(1); 1269 } 1270 umask(prev_mask); 1271 1272 /* 1273 * Fork, and have the parent execute the command, if any, or present 1274 * the socket data. The child continues as the authentication agent. 1275 */ 1276 if (D_flag || d_flag) { 1277 log_init(__progname, 1278 d_flag ? SYSLOG_LEVEL_DEBUG3 : SYSLOG_LEVEL_INFO, 1279 SYSLOG_FACILITY_AUTH, 1); 1280 if (c_flag) 1281 printf("setenv %s %s;\n", 1282 SSH_AUTHSOCKET_ENV_NAME, socket_name); 1283 else 1284 printf("%s=%s; export %s;\n", 1285 SSH_AUTHSOCKET_ENV_NAME, socket_name, 1286 SSH_AUTHSOCKET_ENV_NAME); 1287 printf("echo Agent pid %ld;\n", (long)parent_pid); 1288 fflush(stdout); 1289 goto skip; 1290 } 1291 pid = fork(); 1292 if (pid == -1) { 1293 perror("fork"); 1294 cleanup_exit(1); 1295 } 1296 if (pid != 0) { /* Parent - execute the given command. */ 1297 close(sock); 1298 snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); 1299 if (ac == 0) { 1300 (*f_setenv)(SSH_AUTHSOCKET_ENV_NAME, socket_name); 1301 (*f_setenv)(SSH_AGENTPID_ENV_NAME, pidstrbuf); 1302 printf("echo Agent pid %ld;\n", (long)pid); 1303 exit(0); 1304 } 1305 if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || 1306 setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { 1307 perror("setenv"); 1308 exit(1); 1309 } 1310 execvp(av[0], av); 1311 perror(av[0]); 1312 exit(1); 1313 } 1314 /* child */ 1315 log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); 1316 1317 if (setsid() == -1) { 1318 error("setsid: %s", strerror(errno)); 1319 cleanup_exit(1); 1320 } 1321 1322 (void)chdir("/"); 1323 1324 if (sock != STDERR_FILENO + 1) { 1325 if (dup2(sock, STDERR_FILENO + 1) == -1) { 1326 error("dup2: %s", strerror(errno)); 1327 cleanup_exit(1); 1328 } 1329 close(sock); 1330 sock = STDERR_FILENO + 1; 1331 } 1332 #if defined(F_CLOSEM) 1333 if (fcntl(sock + 1, F_CLOSEM, 0) == -1) { 1334 error("fcntl F_CLOSEM: %s", strerror(errno)); 1335 cleanup_exit(1); 1336 } 1337 #else 1338 { 1339 int nfiles; 1340 #if defined(_SC_OPEN_MAX) 1341 nfiles = sysconf(_SC_OPEN_MAX); 1342 #elif defined(RLIMIT_NOFILE) 1343 if (getrlimit(RLIMIT_CORE, &rlim) < 0) { 1344 error("getrlimit RLIMIT_NOFILE: %s", strerror(errno)); 1345 cleanup_exit(1); 1346 } 1347 nfiles = rlim.rlim_cur; 1348 #elif defined(OPEN_MAX) 1349 nfiles = OPEN_MAX; 1350 #elif defined(NOFILE) 1351 nfiles = NOFILE; 1352 #else 1353 nfiles = 1024; 1354 #endif 1355 for (fd = sock + 1; fd < nfiles; fd++) 1356 close(fd); 1357 } 1358 #endif 1359 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1360 if (dup2(fd, STDIN_FILENO) == -1 || 1361 dup2(fd, STDOUT_FILENO) == -1 || 1362 dup2(fd, STDERR_FILENO) == -1) { 1363 error("dup2: %s", strerror(errno)); 1364 cleanup_exit(1); 1365 } 1366 if (fd > STDERR_FILENO) 1367 close(fd); 1368 } 1369 1370 /* deny core dumps, since memory contains unencrypted private keys */ 1371 rlim.rlim_cur = rlim.rlim_max = 0; 1372 if (setrlimit(RLIMIT_CORE, &rlim) == -1) { 1373 error("setrlimit RLIMIT_CORE: %s", strerror(errno)); 1374 cleanup_exit(1); 1375 } 1376 1377 skip: 1378 1379 cleanup_pid = getpid(); 1380 1381 #ifdef ENABLE_PKCS11 1382 pkcs11_init(0); 1383 #endif 1384 new_socket(AUTH_SOCKET, sock); 1385 if (ac > 0) 1386 parent_alive_interval = 10; 1387 idtab_init(); 1388 signal(SIGPIPE, SIG_IGN); 1389 signal(SIGINT, (d_flag | D_flag) ? cleanup_handler : SIG_IGN); 1390 signal(SIGHUP, cleanup_handler); 1391 signal(SIGTERM, cleanup_handler); 1392 1393 #ifdef __OpenBSD__ 1394 if (pledge("stdio rpath cpath unix id proc exec", NULL) == -1) 1395 fatal("%s: pledge: %s", __progname, strerror(errno)); 1396 #endif 1397 1398 while (1) { 1399 prepare_poll(&pfd, &npfd, &timeout, maxfds); 1400 result = poll(pfd, npfd, timeout); 1401 saved_errno = errno; 1402 if (parent_alive_interval != 0) 1403 check_parent_exists(); 1404 (void) reaper(); /* remove expired keys */ 1405 if (result == -1) { 1406 if (saved_errno == EINTR) 1407 continue; 1408 fatal("poll: %s", strerror(saved_errno)); 1409 } else if (result > 0) 1410 after_poll(pfd, npfd, maxfds); 1411 } 1412 /* NOTREACHED */ 1413 } 1414