1 /* $OpenBSD: ssh-agent.c,v 1.172 2011/06/03 01:37:40 dtucker 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 __RCSID("$FreeBSD$"); 39 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 #include <openssl/evp.h> 54 #include <openssl/md5.h> 55 #include "openbsd-compat/openssl-compat.h" 56 57 #include <errno.h> 58 #include <fcntl.h> 59 #ifdef HAVE_PATHS_H 60 # include <paths.h> 61 #endif 62 #include <signal.h> 63 #include <stdarg.h> 64 #include <stdio.h> 65 #include <stdlib.h> 66 #include <time.h> 67 #include <string.h> 68 #include <unistd.h> 69 70 #include "xmalloc.h" 71 #include "ssh.h" 72 #include "rsa.h" 73 #include "buffer.h" 74 #include "key.h" 75 #include "authfd.h" 76 #include "compat.h" 77 #include "log.h" 78 #include "misc.h" 79 80 #ifdef ENABLE_PKCS11 81 #include "ssh-pkcs11.h" 82 #endif 83 84 #if defined(HAVE_SYS_PRCTL_H) 85 #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ 86 #endif 87 88 typedef enum { 89 AUTH_UNUSED, 90 AUTH_SOCKET, 91 AUTH_CONNECTION 92 } sock_type; 93 94 typedef struct { 95 int fd; 96 sock_type type; 97 Buffer input; 98 Buffer output; 99 Buffer request; 100 } SocketEntry; 101 102 u_int sockets_alloc = 0; 103 SocketEntry *sockets = NULL; 104 105 typedef struct identity { 106 TAILQ_ENTRY(identity) next; 107 Key *key; 108 char *comment; 109 char *provider; 110 u_int death; 111 u_int confirm; 112 } Identity; 113 114 typedef struct { 115 int nentries; 116 TAILQ_HEAD(idqueue, identity) idlist; 117 } Idtab; 118 119 /* private key table, one per protocol version */ 120 Idtab idtable[3]; 121 122 int max_fd = 0; 123 124 /* pid of shell == parent of agent */ 125 pid_t parent_pid = -1; 126 u_int parent_alive_interval = 0; 127 128 /* pathname and directory for AUTH_SOCKET */ 129 char socket_name[MAXPATHLEN]; 130 char socket_dir[MAXPATHLEN]; 131 132 /* locking */ 133 int locked = 0; 134 char *lock_passwd = NULL; 135 136 extern char *__progname; 137 138 /* Default lifetime (0 == forever) */ 139 static int lifetime = 0; 140 141 /* 142 * Client connection count; incremented in new_socket() and decremented in 143 * close_socket(). When it reaches 0, ssh-agent will exit. Since it is 144 * normally initialized to 1, it will never reach 0. However, if the -x 145 * option is specified, it is initialized to 0 in main(); in that case, 146 * ssh-agent will exit as soon as it has had at least one client but no 147 * longer has any. 148 */ 149 static int xcount = 1; 150 151 static void 152 close_socket(SocketEntry *e) 153 { 154 int last = 0; 155 156 if (e->type == AUTH_CONNECTION) { 157 debug("xcount %d -> %d", xcount, xcount - 1); 158 if (--xcount == 0) 159 last = 1; 160 } 161 close(e->fd); 162 e->fd = -1; 163 e->type = AUTH_UNUSED; 164 buffer_free(&e->input); 165 buffer_free(&e->output); 166 buffer_free(&e->request); 167 if (last) 168 cleanup_exit(0); 169 } 170 171 static void 172 idtab_init(void) 173 { 174 int i; 175 176 for (i = 0; i <=2; i++) { 177 TAILQ_INIT(&idtable[i].idlist); 178 idtable[i].nentries = 0; 179 } 180 } 181 182 /* return private key table for requested protocol version */ 183 static Idtab * 184 idtab_lookup(int version) 185 { 186 if (version < 1 || version > 2) 187 fatal("internal error, bad protocol version %d", version); 188 return &idtable[version]; 189 } 190 191 static void 192 free_identity(Identity *id) 193 { 194 key_free(id->key); 195 if (id->provider != NULL) 196 xfree(id->provider); 197 xfree(id->comment); 198 xfree(id); 199 } 200 201 /* return matching private key for given public key */ 202 static Identity * 203 lookup_identity(Key *key, int version) 204 { 205 Identity *id; 206 207 Idtab *tab = idtab_lookup(version); 208 TAILQ_FOREACH(id, &tab->idlist, next) { 209 if (key_equal(key, id->key)) 210 return (id); 211 } 212 return (NULL); 213 } 214 215 /* Check confirmation of keysign request */ 216 static int 217 confirm_key(Identity *id) 218 { 219 char *p; 220 int ret = -1; 221 222 p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); 223 if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", 224 id->comment, p)) 225 ret = 0; 226 xfree(p); 227 228 return (ret); 229 } 230 231 /* send list of supported public keys to 'client' */ 232 static void 233 process_request_identities(SocketEntry *e, int version) 234 { 235 Idtab *tab = idtab_lookup(version); 236 Identity *id; 237 Buffer msg; 238 239 buffer_init(&msg); 240 buffer_put_char(&msg, (version == 1) ? 241 SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); 242 buffer_put_int(&msg, tab->nentries); 243 TAILQ_FOREACH(id, &tab->idlist, next) { 244 if (id->key->type == KEY_RSA1) { 245 buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); 246 buffer_put_bignum(&msg, id->key->rsa->e); 247 buffer_put_bignum(&msg, id->key->rsa->n); 248 } else { 249 u_char *blob; 250 u_int blen; 251 key_to_blob(id->key, &blob, &blen); 252 buffer_put_string(&msg, blob, blen); 253 xfree(blob); 254 } 255 buffer_put_cstring(&msg, id->comment); 256 } 257 buffer_put_int(&e->output, buffer_len(&msg)); 258 buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); 259 buffer_free(&msg); 260 } 261 262 /* ssh1 only */ 263 static void 264 process_authentication_challenge1(SocketEntry *e) 265 { 266 u_char buf[32], mdbuf[16], session_id[16]; 267 u_int response_type; 268 BIGNUM *challenge; 269 Identity *id; 270 int i, len; 271 Buffer msg; 272 MD5_CTX md; 273 Key *key; 274 275 buffer_init(&msg); 276 key = key_new(KEY_RSA1); 277 if ((challenge = BN_new()) == NULL) 278 fatal("process_authentication_challenge1: BN_new failed"); 279 280 (void) buffer_get_int(&e->request); /* ignored */ 281 buffer_get_bignum(&e->request, key->rsa->e); 282 buffer_get_bignum(&e->request, key->rsa->n); 283 buffer_get_bignum(&e->request, challenge); 284 285 /* Only protocol 1.1 is supported */ 286 if (buffer_len(&e->request) == 0) 287 goto failure; 288 buffer_get(&e->request, session_id, 16); 289 response_type = buffer_get_int(&e->request); 290 if (response_type != 1) 291 goto failure; 292 293 id = lookup_identity(key, 1); 294 if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { 295 Key *private = id->key; 296 /* Decrypt the challenge using the private key. */ 297 if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) 298 goto failure; 299 300 /* The response is MD5 of decrypted challenge plus session id. */ 301 len = BN_num_bytes(challenge); 302 if (len <= 0 || len > 32) { 303 logit("process_authentication_challenge: bad challenge length %d", len); 304 goto failure; 305 } 306 memset(buf, 0, 32); 307 BN_bn2bin(challenge, buf + 32 - len); 308 MD5_Init(&md); 309 MD5_Update(&md, buf, 32); 310 MD5_Update(&md, session_id, 16); 311 MD5_Final(mdbuf, &md); 312 313 /* Send the response. */ 314 buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); 315 for (i = 0; i < 16; i++) 316 buffer_put_char(&msg, mdbuf[i]); 317 goto send; 318 } 319 320 failure: 321 /* Unknown identity or protocol error. Send failure. */ 322 buffer_put_char(&msg, SSH_AGENT_FAILURE); 323 send: 324 buffer_put_int(&e->output, buffer_len(&msg)); 325 buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); 326 key_free(key); 327 BN_clear_free(challenge); 328 buffer_free(&msg); 329 } 330 331 /* ssh2 only */ 332 static void 333 process_sign_request2(SocketEntry *e) 334 { 335 u_char *blob, *data, *signature = NULL; 336 u_int blen, dlen, slen = 0; 337 extern int datafellows; 338 int odatafellows; 339 int ok = -1, flags; 340 Buffer msg; 341 Key *key; 342 343 datafellows = 0; 344 345 blob = buffer_get_string(&e->request, &blen); 346 data = buffer_get_string(&e->request, &dlen); 347 348 flags = buffer_get_int(&e->request); 349 odatafellows = datafellows; 350 if (flags & SSH_AGENT_OLD_SIGNATURE) 351 datafellows = SSH_BUG_SIGBLOB; 352 353 key = key_from_blob(blob, blen); 354 if (key != NULL) { 355 Identity *id = lookup_identity(key, 2); 356 if (id != NULL && (!id->confirm || confirm_key(id) == 0)) 357 ok = key_sign(id->key, &signature, &slen, data, dlen); 358 key_free(key); 359 } 360 buffer_init(&msg); 361 if (ok == 0) { 362 buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); 363 buffer_put_string(&msg, signature, slen); 364 } else { 365 buffer_put_char(&msg, SSH_AGENT_FAILURE); 366 } 367 buffer_put_int(&e->output, buffer_len(&msg)); 368 buffer_append(&e->output, buffer_ptr(&msg), 369 buffer_len(&msg)); 370 buffer_free(&msg); 371 xfree(data); 372 xfree(blob); 373 if (signature != NULL) 374 xfree(signature); 375 datafellows = odatafellows; 376 } 377 378 /* shared */ 379 static void 380 process_remove_identity(SocketEntry *e, int version) 381 { 382 u_int blen, bits; 383 int success = 0; 384 Key *key = NULL; 385 u_char *blob; 386 387 switch (version) { 388 case 1: 389 key = key_new(KEY_RSA1); 390 bits = buffer_get_int(&e->request); 391 buffer_get_bignum(&e->request, key->rsa->e); 392 buffer_get_bignum(&e->request, key->rsa->n); 393 394 if (bits != key_size(key)) 395 logit("Warning: identity keysize mismatch: actual %u, announced %u", 396 key_size(key), bits); 397 break; 398 case 2: 399 blob = buffer_get_string(&e->request, &blen); 400 key = key_from_blob(blob, blen); 401 xfree(blob); 402 break; 403 } 404 if (key != NULL) { 405 Identity *id = lookup_identity(key, version); 406 if (id != NULL) { 407 /* 408 * We have this key. Free the old key. Since we 409 * don't want to leave empty slots in the middle of 410 * the array, we actually free the key there and move 411 * all the entries between the empty slot and the end 412 * of the array. 413 */ 414 Idtab *tab = idtab_lookup(version); 415 if (tab->nentries < 1) 416 fatal("process_remove_identity: " 417 "internal error: tab->nentries %d", 418 tab->nentries); 419 TAILQ_REMOVE(&tab->idlist, id, next); 420 free_identity(id); 421 tab->nentries--; 422 success = 1; 423 } 424 key_free(key); 425 } 426 buffer_put_int(&e->output, 1); 427 buffer_put_char(&e->output, 428 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 429 } 430 431 static void 432 process_remove_all_identities(SocketEntry *e, int version) 433 { 434 Idtab *tab = idtab_lookup(version); 435 Identity *id; 436 437 /* Loop over all identities and clear the keys. */ 438 for (id = TAILQ_FIRST(&tab->idlist); id; 439 id = TAILQ_FIRST(&tab->idlist)) { 440 TAILQ_REMOVE(&tab->idlist, id, next); 441 free_identity(id); 442 } 443 444 /* Mark that there are no identities. */ 445 tab->nentries = 0; 446 447 /* Send success. */ 448 buffer_put_int(&e->output, 1); 449 buffer_put_char(&e->output, SSH_AGENT_SUCCESS); 450 } 451 452 /* removes expired keys and returns number of seconds until the next expiry */ 453 static u_int 454 reaper(void) 455 { 456 u_int deadline = 0, now = time(NULL); 457 Identity *id, *nxt; 458 int version; 459 Idtab *tab; 460 461 for (version = 1; version < 3; version++) { 462 tab = idtab_lookup(version); 463 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { 464 nxt = TAILQ_NEXT(id, next); 465 if (id->death == 0) 466 continue; 467 if (now >= id->death) { 468 debug("expiring key '%s'", id->comment); 469 TAILQ_REMOVE(&tab->idlist, id, next); 470 free_identity(id); 471 tab->nentries--; 472 } else 473 deadline = (deadline == 0) ? id->death : 474 MIN(deadline, id->death); 475 } 476 } 477 if (deadline == 0 || deadline <= now) 478 return 0; 479 else 480 return (deadline - now); 481 } 482 483 static void 484 process_add_identity(SocketEntry *e, int version) 485 { 486 Idtab *tab = idtab_lookup(version); 487 Identity *id; 488 int type, success = 0, death = 0, confirm = 0; 489 char *type_name, *comment; 490 Key *k = NULL; 491 #ifdef OPENSSL_HAS_ECC 492 BIGNUM *exponent; 493 EC_POINT *q; 494 char *curve; 495 #endif 496 u_char *cert; 497 u_int len; 498 499 switch (version) { 500 case 1: 501 k = key_new_private(KEY_RSA1); 502 (void) buffer_get_int(&e->request); /* ignored */ 503 buffer_get_bignum(&e->request, k->rsa->n); 504 buffer_get_bignum(&e->request, k->rsa->e); 505 buffer_get_bignum(&e->request, k->rsa->d); 506 buffer_get_bignum(&e->request, k->rsa->iqmp); 507 508 /* SSH and SSL have p and q swapped */ 509 buffer_get_bignum(&e->request, k->rsa->q); /* p */ 510 buffer_get_bignum(&e->request, k->rsa->p); /* q */ 511 512 /* Generate additional parameters */ 513 rsa_generate_additional_parameters(k->rsa); 514 break; 515 case 2: 516 type_name = buffer_get_string(&e->request, NULL); 517 type = key_type_from_name(type_name); 518 switch (type) { 519 case KEY_DSA: 520 k = key_new_private(type); 521 buffer_get_bignum2(&e->request, k->dsa->p); 522 buffer_get_bignum2(&e->request, k->dsa->q); 523 buffer_get_bignum2(&e->request, k->dsa->g); 524 buffer_get_bignum2(&e->request, k->dsa->pub_key); 525 buffer_get_bignum2(&e->request, k->dsa->priv_key); 526 break; 527 case KEY_DSA_CERT_V00: 528 case KEY_DSA_CERT: 529 cert = buffer_get_string(&e->request, &len); 530 if ((k = key_from_blob(cert, len)) == NULL) 531 fatal("Certificate parse failed"); 532 xfree(cert); 533 key_add_private(k); 534 buffer_get_bignum2(&e->request, k->dsa->priv_key); 535 break; 536 #ifdef OPENSSL_HAS_ECC 537 case KEY_ECDSA: 538 k = key_new_private(type); 539 k->ecdsa_nid = key_ecdsa_nid_from_name(type_name); 540 curve = buffer_get_string(&e->request, NULL); 541 if (k->ecdsa_nid != key_curve_name_to_nid(curve)) 542 fatal("%s: curve names mismatch", __func__); 543 xfree(curve); 544 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 545 if (k->ecdsa == NULL) 546 fatal("%s: EC_KEY_new_by_curve_name failed", 547 __func__); 548 q = EC_POINT_new(EC_KEY_get0_group(k->ecdsa)); 549 if (q == NULL) 550 fatal("%s: BN_new failed", __func__); 551 if ((exponent = BN_new()) == NULL) 552 fatal("%s: BN_new failed", __func__); 553 buffer_get_ecpoint(&e->request, 554 EC_KEY_get0_group(k->ecdsa), q); 555 buffer_get_bignum2(&e->request, exponent); 556 if (EC_KEY_set_public_key(k->ecdsa, q) != 1) 557 fatal("%s: EC_KEY_set_public_key failed", 558 __func__); 559 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) 560 fatal("%s: EC_KEY_set_private_key failed", 561 __func__); 562 if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 563 EC_KEY_get0_public_key(k->ecdsa)) != 0) 564 fatal("%s: bad ECDSA public key", __func__); 565 if (key_ec_validate_private(k->ecdsa) != 0) 566 fatal("%s: bad ECDSA private key", __func__); 567 BN_clear_free(exponent); 568 EC_POINT_free(q); 569 break; 570 case KEY_ECDSA_CERT: 571 cert = buffer_get_string(&e->request, &len); 572 if ((k = key_from_blob(cert, len)) == NULL) 573 fatal("Certificate parse failed"); 574 xfree(cert); 575 key_add_private(k); 576 if ((exponent = BN_new()) == NULL) 577 fatal("%s: BN_new failed", __func__); 578 buffer_get_bignum2(&e->request, exponent); 579 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) 580 fatal("%s: EC_KEY_set_private_key failed", 581 __func__); 582 if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 583 EC_KEY_get0_public_key(k->ecdsa)) != 0 || 584 key_ec_validate_private(k->ecdsa) != 0) 585 fatal("%s: bad ECDSA key", __func__); 586 BN_clear_free(exponent); 587 break; 588 #endif /* OPENSSL_HAS_ECC */ 589 case KEY_RSA: 590 k = key_new_private(type); 591 buffer_get_bignum2(&e->request, k->rsa->n); 592 buffer_get_bignum2(&e->request, k->rsa->e); 593 buffer_get_bignum2(&e->request, k->rsa->d); 594 buffer_get_bignum2(&e->request, k->rsa->iqmp); 595 buffer_get_bignum2(&e->request, k->rsa->p); 596 buffer_get_bignum2(&e->request, k->rsa->q); 597 598 /* Generate additional parameters */ 599 rsa_generate_additional_parameters(k->rsa); 600 break; 601 case KEY_RSA_CERT_V00: 602 case KEY_RSA_CERT: 603 cert = buffer_get_string(&e->request, &len); 604 if ((k = key_from_blob(cert, len)) == NULL) 605 fatal("Certificate parse failed"); 606 xfree(cert); 607 key_add_private(k); 608 buffer_get_bignum2(&e->request, k->rsa->d); 609 buffer_get_bignum2(&e->request, k->rsa->iqmp); 610 buffer_get_bignum2(&e->request, k->rsa->p); 611 buffer_get_bignum2(&e->request, k->rsa->q); 612 break; 613 default: 614 xfree(type_name); 615 buffer_clear(&e->request); 616 goto send; 617 } 618 xfree(type_name); 619 break; 620 } 621 /* enable blinding */ 622 switch (k->type) { 623 case KEY_RSA: 624 case KEY_RSA_CERT_V00: 625 case KEY_RSA_CERT: 626 case KEY_RSA1: 627 if (RSA_blinding_on(k->rsa, NULL) != 1) { 628 error("process_add_identity: RSA_blinding_on failed"); 629 key_free(k); 630 goto send; 631 } 632 break; 633 } 634 comment = buffer_get_string(&e->request, NULL); 635 if (k == NULL) { 636 xfree(comment); 637 goto send; 638 } 639 while (buffer_len(&e->request)) { 640 switch ((type = buffer_get_char(&e->request))) { 641 case SSH_AGENT_CONSTRAIN_LIFETIME: 642 death = time(NULL) + buffer_get_int(&e->request); 643 break; 644 case SSH_AGENT_CONSTRAIN_CONFIRM: 645 confirm = 1; 646 break; 647 default: 648 error("process_add_identity: " 649 "Unknown constraint type %d", type); 650 xfree(comment); 651 key_free(k); 652 goto send; 653 } 654 } 655 success = 1; 656 if (lifetime && !death) 657 death = time(NULL) + lifetime; 658 if ((id = lookup_identity(k, version)) == NULL) { 659 id = xcalloc(1, sizeof(Identity)); 660 id->key = k; 661 TAILQ_INSERT_TAIL(&tab->idlist, id, next); 662 /* Increment the number of identities. */ 663 tab->nentries++; 664 } else { 665 key_free(k); 666 xfree(id->comment); 667 } 668 id->comment = comment; 669 id->death = death; 670 id->confirm = confirm; 671 send: 672 buffer_put_int(&e->output, 1); 673 buffer_put_char(&e->output, 674 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 675 } 676 677 /* XXX todo: encrypt sensitive data with passphrase */ 678 static void 679 process_lock_agent(SocketEntry *e, int lock) 680 { 681 int success = 0; 682 char *passwd; 683 684 passwd = buffer_get_string(&e->request, NULL); 685 if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { 686 locked = 0; 687 memset(lock_passwd, 0, strlen(lock_passwd)); 688 xfree(lock_passwd); 689 lock_passwd = NULL; 690 success = 1; 691 } else if (!locked && lock) { 692 locked = 1; 693 lock_passwd = xstrdup(passwd); 694 success = 1; 695 } 696 memset(passwd, 0, strlen(passwd)); 697 xfree(passwd); 698 699 buffer_put_int(&e->output, 1); 700 buffer_put_char(&e->output, 701 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 702 } 703 704 static void 705 no_identities(SocketEntry *e, u_int type) 706 { 707 Buffer msg; 708 709 buffer_init(&msg); 710 buffer_put_char(&msg, 711 (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? 712 SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); 713 buffer_put_int(&msg, 0); 714 buffer_put_int(&e->output, buffer_len(&msg)); 715 buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); 716 buffer_free(&msg); 717 } 718 719 #ifdef ENABLE_PKCS11 720 static void 721 process_add_smartcard_key(SocketEntry *e) 722 { 723 char *provider = NULL, *pin; 724 int i, type, version, count = 0, success = 0, death = 0, confirm = 0; 725 Key **keys = NULL, *k; 726 Identity *id; 727 Idtab *tab; 728 729 provider = buffer_get_string(&e->request, NULL); 730 pin = buffer_get_string(&e->request, NULL); 731 732 while (buffer_len(&e->request)) { 733 switch ((type = buffer_get_char(&e->request))) { 734 case SSH_AGENT_CONSTRAIN_LIFETIME: 735 death = time(NULL) + buffer_get_int(&e->request); 736 break; 737 case SSH_AGENT_CONSTRAIN_CONFIRM: 738 confirm = 1; 739 break; 740 default: 741 error("process_add_smartcard_key: " 742 "Unknown constraint type %d", type); 743 goto send; 744 } 745 } 746 if (lifetime && !death) 747 death = time(NULL) + lifetime; 748 749 count = pkcs11_add_provider(provider, pin, &keys); 750 for (i = 0; i < count; i++) { 751 k = keys[i]; 752 version = k->type == KEY_RSA1 ? 1 : 2; 753 tab = idtab_lookup(version); 754 if (lookup_identity(k, version) == NULL) { 755 id = xcalloc(1, sizeof(Identity)); 756 id->key = k; 757 id->provider = xstrdup(provider); 758 id->comment = xstrdup(provider); /* XXX */ 759 id->death = death; 760 id->confirm = confirm; 761 TAILQ_INSERT_TAIL(&tab->idlist, id, next); 762 tab->nentries++; 763 success = 1; 764 } else { 765 key_free(k); 766 } 767 keys[i] = NULL; 768 } 769 send: 770 if (pin) 771 xfree(pin); 772 if (provider) 773 xfree(provider); 774 if (keys) 775 xfree(keys); 776 buffer_put_int(&e->output, 1); 777 buffer_put_char(&e->output, 778 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 779 } 780 781 static void 782 process_remove_smartcard_key(SocketEntry *e) 783 { 784 char *provider = NULL, *pin = NULL; 785 int version, success = 0; 786 Identity *id, *nxt; 787 Idtab *tab; 788 789 provider = buffer_get_string(&e->request, NULL); 790 pin = buffer_get_string(&e->request, NULL); 791 xfree(pin); 792 793 for (version = 1; version < 3; version++) { 794 tab = idtab_lookup(version); 795 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { 796 nxt = TAILQ_NEXT(id, next); 797 if (!strcmp(provider, id->provider)) { 798 TAILQ_REMOVE(&tab->idlist, id, next); 799 free_identity(id); 800 tab->nentries--; 801 } 802 } 803 } 804 if (pkcs11_del_provider(provider) == 0) 805 success = 1; 806 else 807 error("process_remove_smartcard_key:" 808 " pkcs11_del_provider failed"); 809 xfree(provider); 810 buffer_put_int(&e->output, 1); 811 buffer_put_char(&e->output, 812 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 813 } 814 #endif /* ENABLE_PKCS11 */ 815 816 /* dispatch incoming messages */ 817 818 static void 819 process_message(SocketEntry *e) 820 { 821 u_int msg_len, type; 822 u_char *cp; 823 824 if (buffer_len(&e->input) < 5) 825 return; /* Incomplete message. */ 826 cp = buffer_ptr(&e->input); 827 msg_len = get_u32(cp); 828 if (msg_len > 256 * 1024) { 829 close_socket(e); 830 return; 831 } 832 if (buffer_len(&e->input) < msg_len + 4) 833 return; 834 835 /* move the current input to e->request */ 836 buffer_consume(&e->input, 4); 837 buffer_clear(&e->request); 838 buffer_append(&e->request, buffer_ptr(&e->input), msg_len); 839 buffer_consume(&e->input, msg_len); 840 type = buffer_get_char(&e->request); 841 842 /* check wheter agent is locked */ 843 if (locked && type != SSH_AGENTC_UNLOCK) { 844 buffer_clear(&e->request); 845 switch (type) { 846 case SSH_AGENTC_REQUEST_RSA_IDENTITIES: 847 case SSH2_AGENTC_REQUEST_IDENTITIES: 848 /* send empty lists */ 849 no_identities(e, type); 850 break; 851 default: 852 /* send a fail message for all other request types */ 853 buffer_put_int(&e->output, 1); 854 buffer_put_char(&e->output, SSH_AGENT_FAILURE); 855 } 856 return; 857 } 858 859 debug("type %d", type); 860 switch (type) { 861 case SSH_AGENTC_LOCK: 862 case SSH_AGENTC_UNLOCK: 863 process_lock_agent(e, type == SSH_AGENTC_LOCK); 864 break; 865 /* ssh1 */ 866 case SSH_AGENTC_RSA_CHALLENGE: 867 process_authentication_challenge1(e); 868 break; 869 case SSH_AGENTC_REQUEST_RSA_IDENTITIES: 870 process_request_identities(e, 1); 871 break; 872 case SSH_AGENTC_ADD_RSA_IDENTITY: 873 case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: 874 process_add_identity(e, 1); 875 break; 876 case SSH_AGENTC_REMOVE_RSA_IDENTITY: 877 process_remove_identity(e, 1); 878 break; 879 case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: 880 process_remove_all_identities(e, 1); 881 break; 882 /* ssh2 */ 883 case SSH2_AGENTC_SIGN_REQUEST: 884 process_sign_request2(e); 885 break; 886 case SSH2_AGENTC_REQUEST_IDENTITIES: 887 process_request_identities(e, 2); 888 break; 889 case SSH2_AGENTC_ADD_IDENTITY: 890 case SSH2_AGENTC_ADD_ID_CONSTRAINED: 891 process_add_identity(e, 2); 892 break; 893 case SSH2_AGENTC_REMOVE_IDENTITY: 894 process_remove_identity(e, 2); 895 break; 896 case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: 897 process_remove_all_identities(e, 2); 898 break; 899 #ifdef ENABLE_PKCS11 900 case SSH_AGENTC_ADD_SMARTCARD_KEY: 901 case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: 902 process_add_smartcard_key(e); 903 break; 904 case SSH_AGENTC_REMOVE_SMARTCARD_KEY: 905 process_remove_smartcard_key(e); 906 break; 907 #endif /* ENABLE_PKCS11 */ 908 default: 909 /* Unknown message. Respond with failure. */ 910 error("Unknown message %d", type); 911 buffer_clear(&e->request); 912 buffer_put_int(&e->output, 1); 913 buffer_put_char(&e->output, SSH_AGENT_FAILURE); 914 break; 915 } 916 } 917 918 static void 919 new_socket(sock_type type, int fd) 920 { 921 u_int i, old_alloc, new_alloc; 922 923 if (type == AUTH_CONNECTION) { 924 debug("xcount %d -> %d", xcount, xcount + 1); 925 ++xcount; 926 } 927 set_nonblock(fd); 928 929 if (fd > max_fd) 930 max_fd = fd; 931 932 for (i = 0; i < sockets_alloc; i++) 933 if (sockets[i].type == AUTH_UNUSED) { 934 sockets[i].fd = fd; 935 buffer_init(&sockets[i].input); 936 buffer_init(&sockets[i].output); 937 buffer_init(&sockets[i].request); 938 sockets[i].type = type; 939 return; 940 } 941 old_alloc = sockets_alloc; 942 new_alloc = sockets_alloc + 10; 943 sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); 944 for (i = old_alloc; i < new_alloc; i++) 945 sockets[i].type = AUTH_UNUSED; 946 sockets_alloc = new_alloc; 947 sockets[old_alloc].fd = fd; 948 buffer_init(&sockets[old_alloc].input); 949 buffer_init(&sockets[old_alloc].output); 950 buffer_init(&sockets[old_alloc].request); 951 sockets[old_alloc].type = type; 952 } 953 954 static int 955 prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp, 956 struct timeval **tvpp) 957 { 958 u_int i, sz, deadline; 959 int n = 0; 960 static struct timeval tv; 961 962 for (i = 0; i < sockets_alloc; i++) { 963 switch (sockets[i].type) { 964 case AUTH_SOCKET: 965 case AUTH_CONNECTION: 966 n = MAX(n, sockets[i].fd); 967 break; 968 case AUTH_UNUSED: 969 break; 970 default: 971 fatal("Unknown socket type %d", sockets[i].type); 972 break; 973 } 974 } 975 976 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); 977 if (*fdrp == NULL || sz > *nallocp) { 978 if (*fdrp) 979 xfree(*fdrp); 980 if (*fdwp) 981 xfree(*fdwp); 982 *fdrp = xmalloc(sz); 983 *fdwp = xmalloc(sz); 984 *nallocp = sz; 985 } 986 if (n < *fdl) 987 debug("XXX shrink: %d < %d", n, *fdl); 988 *fdl = n; 989 memset(*fdrp, 0, sz); 990 memset(*fdwp, 0, sz); 991 992 for (i = 0; i < sockets_alloc; i++) { 993 switch (sockets[i].type) { 994 case AUTH_SOCKET: 995 case AUTH_CONNECTION: 996 FD_SET(sockets[i].fd, *fdrp); 997 if (buffer_len(&sockets[i].output) > 0) 998 FD_SET(sockets[i].fd, *fdwp); 999 break; 1000 default: 1001 break; 1002 } 1003 } 1004 deadline = reaper(); 1005 if (parent_alive_interval != 0) 1006 deadline = (deadline == 0) ? parent_alive_interval : 1007 MIN(deadline, parent_alive_interval); 1008 if (deadline == 0) { 1009 *tvpp = NULL; 1010 } else { 1011 tv.tv_sec = deadline; 1012 tv.tv_usec = 0; 1013 *tvpp = &tv; 1014 } 1015 return (1); 1016 } 1017 1018 static void 1019 after_select(fd_set *readset, fd_set *writeset) 1020 { 1021 struct sockaddr_un sunaddr; 1022 socklen_t slen; 1023 char buf[1024]; 1024 int len, sock; 1025 u_int i, orig_alloc; 1026 uid_t euid; 1027 gid_t egid; 1028 1029 for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++) 1030 switch (sockets[i].type) { 1031 case AUTH_UNUSED: 1032 break; 1033 case AUTH_SOCKET: 1034 if (FD_ISSET(sockets[i].fd, readset)) { 1035 slen = sizeof(sunaddr); 1036 sock = accept(sockets[i].fd, 1037 (struct sockaddr *)&sunaddr, &slen); 1038 if (sock < 0) { 1039 error("accept from AUTH_SOCKET: %s", 1040 strerror(errno)); 1041 break; 1042 } 1043 if (getpeereid(sock, &euid, &egid) < 0) { 1044 error("getpeereid %d failed: %s", 1045 sock, strerror(errno)); 1046 close(sock); 1047 break; 1048 } 1049 if ((euid != 0) && (getuid() != euid)) { 1050 error("uid mismatch: " 1051 "peer euid %u != uid %u", 1052 (u_int) euid, (u_int) getuid()); 1053 close(sock); 1054 break; 1055 } 1056 new_socket(AUTH_CONNECTION, sock); 1057 } 1058 break; 1059 case AUTH_CONNECTION: 1060 if (buffer_len(&sockets[i].output) > 0 && 1061 FD_ISSET(sockets[i].fd, writeset)) { 1062 len = write(sockets[i].fd, 1063 buffer_ptr(&sockets[i].output), 1064 buffer_len(&sockets[i].output)); 1065 if (len == -1 && (errno == EAGAIN || 1066 errno == EWOULDBLOCK || 1067 errno == EINTR)) 1068 continue; 1069 if (len <= 0) { 1070 close_socket(&sockets[i]); 1071 break; 1072 } 1073 buffer_consume(&sockets[i].output, len); 1074 } 1075 if (FD_ISSET(sockets[i].fd, readset)) { 1076 len = read(sockets[i].fd, buf, sizeof(buf)); 1077 if (len == -1 && (errno == EAGAIN || 1078 errno == EWOULDBLOCK || 1079 errno == EINTR)) 1080 continue; 1081 if (len <= 0) { 1082 close_socket(&sockets[i]); 1083 break; 1084 } 1085 buffer_append(&sockets[i].input, buf, len); 1086 process_message(&sockets[i]); 1087 } 1088 break; 1089 default: 1090 fatal("Unknown type %d", sockets[i].type); 1091 } 1092 } 1093 1094 static void 1095 cleanup_socket(void) 1096 { 1097 if (socket_name[0]) 1098 unlink(socket_name); 1099 if (socket_dir[0]) 1100 rmdir(socket_dir); 1101 } 1102 1103 void 1104 cleanup_exit(int i) 1105 { 1106 cleanup_socket(); 1107 _exit(i); 1108 } 1109 1110 /*ARGSUSED*/ 1111 static void 1112 cleanup_handler(int sig) 1113 { 1114 cleanup_socket(); 1115 #ifdef ENABLE_PKCS11 1116 pkcs11_terminate(); 1117 #endif 1118 _exit(2); 1119 } 1120 1121 static void 1122 check_parent_exists(void) 1123 { 1124 /* 1125 * If our parent has exited then getppid() will return (pid_t)1, 1126 * so testing for that should be safe. 1127 */ 1128 if (parent_pid != -1 && getppid() != parent_pid) { 1129 /* printf("Parent has died - Authentication agent exiting.\n"); */ 1130 cleanup_socket(); 1131 _exit(2); 1132 } 1133 } 1134 1135 static void 1136 usage(void) 1137 { 1138 fprintf(stderr, "usage: %s [options] [command [arg ...]]\n", 1139 __progname); 1140 fprintf(stderr, "Options:\n"); 1141 fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); 1142 fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); 1143 fprintf(stderr, " -k Kill the current agent.\n"); 1144 fprintf(stderr, " -d Debug mode.\n"); 1145 fprintf(stderr, " -a socket Bind agent socket to given name.\n"); 1146 fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); 1147 fprintf(stderr, " -x Exit when the last client disconnects.\n"); 1148 exit(1); 1149 } 1150 1151 int 1152 main(int ac, char **av) 1153 { 1154 int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; 1155 int sock, fd, ch, result, saved_errno; 1156 u_int nalloc; 1157 char *shell, *format, *pidstr, *agentsocket = NULL; 1158 fd_set *readsetp = NULL, *writesetp = NULL; 1159 struct sockaddr_un sunaddr; 1160 #ifdef HAVE_SETRLIMIT 1161 struct rlimit rlim; 1162 #endif 1163 int prev_mask; 1164 extern int optind; 1165 extern char *optarg; 1166 pid_t pid; 1167 char pidstrbuf[1 + 3 * sizeof pid]; 1168 struct timeval *tvp = NULL; 1169 size_t len; 1170 1171 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1172 sanitise_stdfd(); 1173 1174 /* drop */ 1175 setegid(getgid()); 1176 setgid(getgid()); 1177 setuid(geteuid()); 1178 1179 #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) 1180 /* Disable ptrace on Linux without sgid bit */ 1181 prctl(PR_SET_DUMPABLE, 0); 1182 #endif 1183 1184 OpenSSL_add_all_algorithms(); 1185 1186 __progname = ssh_get_progname(av[0]); 1187 seed_rng(); 1188 1189 while ((ch = getopt(ac, av, "cdksa:t:x")) != -1) { 1190 switch (ch) { 1191 case 'c': 1192 if (s_flag) 1193 usage(); 1194 c_flag++; 1195 break; 1196 case 'k': 1197 k_flag++; 1198 break; 1199 case 's': 1200 if (c_flag) 1201 usage(); 1202 s_flag++; 1203 break; 1204 case 'd': 1205 if (d_flag) 1206 usage(); 1207 d_flag++; 1208 break; 1209 case 'a': 1210 agentsocket = optarg; 1211 break; 1212 case 't': 1213 if ((lifetime = convtime(optarg)) == -1) { 1214 fprintf(stderr, "Invalid lifetime\n"); 1215 usage(); 1216 } 1217 break; 1218 case 'x': 1219 xcount = 0; 1220 break; 1221 default: 1222 usage(); 1223 } 1224 } 1225 ac -= optind; 1226 av += optind; 1227 1228 if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) 1229 usage(); 1230 1231 if (ac == 0 && !c_flag && !s_flag) { 1232 shell = getenv("SHELL"); 1233 if (shell != NULL && (len = strlen(shell)) > 2 && 1234 strncmp(shell + len - 3, "csh", 3) == 0) 1235 c_flag = 1; 1236 } 1237 if (k_flag) { 1238 const char *errstr = NULL; 1239 1240 pidstr = getenv(SSH_AGENTPID_ENV_NAME); 1241 if (pidstr == NULL) { 1242 fprintf(stderr, "%s not set, cannot kill agent\n", 1243 SSH_AGENTPID_ENV_NAME); 1244 exit(1); 1245 } 1246 pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); 1247 if (errstr) { 1248 fprintf(stderr, 1249 "%s=\"%s\", which is not a good PID: %s\n", 1250 SSH_AGENTPID_ENV_NAME, pidstr, errstr); 1251 exit(1); 1252 } 1253 if (kill(pid, SIGTERM) == -1) { 1254 perror("kill"); 1255 exit(1); 1256 } 1257 format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; 1258 printf(format, SSH_AUTHSOCKET_ENV_NAME); 1259 printf(format, SSH_AGENTPID_ENV_NAME); 1260 printf("echo Agent pid %ld killed;\n", (long)pid); 1261 exit(0); 1262 } 1263 parent_pid = getpid(); 1264 1265 if (agentsocket == NULL) { 1266 /* Create private directory for agent socket */ 1267 mktemp_proto(socket_dir, sizeof(socket_dir)); 1268 if (mkdtemp(socket_dir) == NULL) { 1269 perror("mkdtemp: private socket dir"); 1270 exit(1); 1271 } 1272 snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, 1273 (long)parent_pid); 1274 } else { 1275 /* Try to use specified agent socket */ 1276 socket_dir[0] = '\0'; 1277 strlcpy(socket_name, agentsocket, sizeof socket_name); 1278 } 1279 1280 /* 1281 * Create socket early so it will exist before command gets run from 1282 * the parent. 1283 */ 1284 sock = socket(AF_UNIX, SOCK_STREAM, 0); 1285 if (sock < 0) { 1286 perror("socket"); 1287 *socket_name = '\0'; /* Don't unlink any existing file */ 1288 cleanup_exit(1); 1289 } 1290 memset(&sunaddr, 0, sizeof(sunaddr)); 1291 sunaddr.sun_family = AF_UNIX; 1292 strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); 1293 prev_mask = umask(0177); 1294 if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { 1295 perror("bind"); 1296 *socket_name = '\0'; /* Don't unlink any existing file */ 1297 umask(prev_mask); 1298 cleanup_exit(1); 1299 } 1300 umask(prev_mask); 1301 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { 1302 perror("listen"); 1303 cleanup_exit(1); 1304 } 1305 1306 /* 1307 * Fork, and have the parent execute the command, if any, or present 1308 * the socket data. The child continues as the authentication agent. 1309 */ 1310 if (d_flag) { 1311 log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); 1312 format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; 1313 printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, 1314 SSH_AUTHSOCKET_ENV_NAME); 1315 printf("echo Agent pid %ld;\n", (long)parent_pid); 1316 goto skip; 1317 } 1318 pid = fork(); 1319 if (pid == -1) { 1320 perror("fork"); 1321 cleanup_exit(1); 1322 } 1323 if (pid != 0) { /* Parent - execute the given command. */ 1324 close(sock); 1325 snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); 1326 if (ac == 0) { 1327 format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; 1328 printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, 1329 SSH_AUTHSOCKET_ENV_NAME); 1330 printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, 1331 SSH_AGENTPID_ENV_NAME); 1332 printf("echo Agent pid %ld;\n", (long)pid); 1333 exit(0); 1334 } 1335 if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || 1336 setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { 1337 perror("setenv"); 1338 exit(1); 1339 } 1340 execvp(av[0], av); 1341 perror(av[0]); 1342 exit(1); 1343 } 1344 /* child */ 1345 log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); 1346 1347 if (setsid() == -1) { 1348 error("setsid: %s", strerror(errno)); 1349 cleanup_exit(1); 1350 } 1351 1352 (void)chdir("/"); 1353 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1354 /* XXX might close listen socket */ 1355 (void)dup2(fd, STDIN_FILENO); 1356 (void)dup2(fd, STDOUT_FILENO); 1357 (void)dup2(fd, STDERR_FILENO); 1358 if (fd > 2) 1359 close(fd); 1360 } 1361 1362 #ifdef HAVE_SETRLIMIT 1363 /* deny core dumps, since memory contains unencrypted private keys */ 1364 rlim.rlim_cur = rlim.rlim_max = 0; 1365 if (setrlimit(RLIMIT_CORE, &rlim) < 0) { 1366 error("setrlimit RLIMIT_CORE: %s", strerror(errno)); 1367 cleanup_exit(1); 1368 } 1369 #endif 1370 1371 skip: 1372 1373 #ifdef ENABLE_PKCS11 1374 pkcs11_init(0); 1375 #endif 1376 new_socket(AUTH_SOCKET, sock); 1377 if (ac > 0) 1378 parent_alive_interval = 10; 1379 idtab_init(); 1380 signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN); 1381 signal(SIGPIPE, SIG_IGN); 1382 signal(SIGHUP, cleanup_handler); 1383 signal(SIGTERM, cleanup_handler); 1384 nalloc = 0; 1385 1386 while (1) { 1387 prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp); 1388 result = select(max_fd + 1, readsetp, writesetp, NULL, tvp); 1389 saved_errno = errno; 1390 if (parent_alive_interval != 0) 1391 check_parent_exists(); 1392 (void) reaper(); /* remove expired keys */ 1393 if (result < 0) { 1394 if (saved_errno == EINTR) 1395 continue; 1396 fatal("select: %s", strerror(saved_errno)); 1397 } else if (result > 0) 1398 after_select(readsetp, writesetp); 1399 } 1400 /* NOTREACHED */ 1401 } 1402