1 /* $OpenBSD: ssh-agent.c,v 1.177 2013/07/20 01:50:20 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 __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 time_t 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 time_t 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 in seconds (0 == forever) */ 139 static long 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 free(id->provider); 196 free(id->comment); 197 free(id); 198 } 199 200 /* return matching private key for given public key */ 201 static Identity * 202 lookup_identity(Key *key, int version) 203 { 204 Identity *id; 205 206 Idtab *tab = idtab_lookup(version); 207 TAILQ_FOREACH(id, &tab->idlist, next) { 208 if (key_equal(key, id->key)) 209 return (id); 210 } 211 return (NULL); 212 } 213 214 /* Check confirmation of keysign request */ 215 static int 216 confirm_key(Identity *id) 217 { 218 char *p; 219 int ret = -1; 220 221 p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); 222 if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", 223 id->comment, p)) 224 ret = 0; 225 free(p); 226 227 return (ret); 228 } 229 230 /* send list of supported public keys to 'client' */ 231 static void 232 process_request_identities(SocketEntry *e, int version) 233 { 234 Idtab *tab = idtab_lookup(version); 235 Identity *id; 236 Buffer msg; 237 238 buffer_init(&msg); 239 buffer_put_char(&msg, (version == 1) ? 240 SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); 241 buffer_put_int(&msg, tab->nentries); 242 TAILQ_FOREACH(id, &tab->idlist, next) { 243 if (id->key->type == KEY_RSA1) { 244 buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); 245 buffer_put_bignum(&msg, id->key->rsa->e); 246 buffer_put_bignum(&msg, id->key->rsa->n); 247 } else { 248 u_char *blob; 249 u_int blen; 250 key_to_blob(id->key, &blob, &blen); 251 buffer_put_string(&msg, blob, blen); 252 free(blob); 253 } 254 buffer_put_cstring(&msg, id->comment); 255 } 256 buffer_put_int(&e->output, buffer_len(&msg)); 257 buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); 258 buffer_free(&msg); 259 } 260 261 /* ssh1 only */ 262 static void 263 process_authentication_challenge1(SocketEntry *e) 264 { 265 u_char buf[32], mdbuf[16], session_id[16]; 266 u_int response_type; 267 BIGNUM *challenge; 268 Identity *id; 269 int i, len; 270 Buffer msg; 271 MD5_CTX md; 272 Key *key; 273 274 buffer_init(&msg); 275 key = key_new(KEY_RSA1); 276 if ((challenge = BN_new()) == NULL) 277 fatal("process_authentication_challenge1: BN_new failed"); 278 279 (void) buffer_get_int(&e->request); /* ignored */ 280 buffer_get_bignum(&e->request, key->rsa->e); 281 buffer_get_bignum(&e->request, key->rsa->n); 282 buffer_get_bignum(&e->request, challenge); 283 284 /* Only protocol 1.1 is supported */ 285 if (buffer_len(&e->request) == 0) 286 goto failure; 287 buffer_get(&e->request, session_id, 16); 288 response_type = buffer_get_int(&e->request); 289 if (response_type != 1) 290 goto failure; 291 292 id = lookup_identity(key, 1); 293 if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { 294 Key *private = id->key; 295 /* Decrypt the challenge using the private key. */ 296 if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) 297 goto failure; 298 299 /* The response is MD5 of decrypted challenge plus session id. */ 300 len = BN_num_bytes(challenge); 301 if (len <= 0 || len > 32) { 302 logit("process_authentication_challenge: bad challenge length %d", len); 303 goto failure; 304 } 305 memset(buf, 0, 32); 306 BN_bn2bin(challenge, buf + 32 - len); 307 MD5_Init(&md); 308 MD5_Update(&md, buf, 32); 309 MD5_Update(&md, session_id, 16); 310 MD5_Final(mdbuf, &md); 311 312 /* Send the response. */ 313 buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); 314 for (i = 0; i < 16; i++) 315 buffer_put_char(&msg, mdbuf[i]); 316 goto send; 317 } 318 319 failure: 320 /* Unknown identity or protocol error. Send failure. */ 321 buffer_put_char(&msg, SSH_AGENT_FAILURE); 322 send: 323 buffer_put_int(&e->output, buffer_len(&msg)); 324 buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); 325 key_free(key); 326 BN_clear_free(challenge); 327 buffer_free(&msg); 328 } 329 330 /* ssh2 only */ 331 static void 332 process_sign_request2(SocketEntry *e) 333 { 334 u_char *blob, *data, *signature = NULL; 335 u_int blen, dlen, slen = 0; 336 extern int datafellows; 337 int odatafellows; 338 int ok = -1, flags; 339 Buffer msg; 340 Key *key; 341 342 datafellows = 0; 343 344 blob = buffer_get_string(&e->request, &blen); 345 data = buffer_get_string(&e->request, &dlen); 346 347 flags = buffer_get_int(&e->request); 348 odatafellows = datafellows; 349 if (flags & SSH_AGENT_OLD_SIGNATURE) 350 datafellows = SSH_BUG_SIGBLOB; 351 352 key = key_from_blob(blob, blen); 353 if (key != NULL) { 354 Identity *id = lookup_identity(key, 2); 355 if (id != NULL && (!id->confirm || confirm_key(id) == 0)) 356 ok = key_sign(id->key, &signature, &slen, data, dlen); 357 key_free(key); 358 } 359 buffer_init(&msg); 360 if (ok == 0) { 361 buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); 362 buffer_put_string(&msg, signature, slen); 363 } else { 364 buffer_put_char(&msg, SSH_AGENT_FAILURE); 365 } 366 buffer_put_int(&e->output, buffer_len(&msg)); 367 buffer_append(&e->output, buffer_ptr(&msg), 368 buffer_len(&msg)); 369 buffer_free(&msg); 370 free(data); 371 free(blob); 372 free(signature); 373 datafellows = odatafellows; 374 } 375 376 /* shared */ 377 static void 378 process_remove_identity(SocketEntry *e, int version) 379 { 380 u_int blen, bits; 381 int success = 0; 382 Key *key = NULL; 383 u_char *blob; 384 385 switch (version) { 386 case 1: 387 key = key_new(KEY_RSA1); 388 bits = buffer_get_int(&e->request); 389 buffer_get_bignum(&e->request, key->rsa->e); 390 buffer_get_bignum(&e->request, key->rsa->n); 391 392 if (bits != key_size(key)) 393 logit("Warning: identity keysize mismatch: actual %u, announced %u", 394 key_size(key), bits); 395 break; 396 case 2: 397 blob = buffer_get_string(&e->request, &blen); 398 key = key_from_blob(blob, blen); 399 free(blob); 400 break; 401 } 402 if (key != NULL) { 403 Identity *id = lookup_identity(key, version); 404 if (id != NULL) { 405 /* 406 * We have this key. Free the old key. Since we 407 * don't want to leave empty slots in the middle of 408 * the array, we actually free the key there and move 409 * all the entries between the empty slot and the end 410 * of the array. 411 */ 412 Idtab *tab = idtab_lookup(version); 413 if (tab->nentries < 1) 414 fatal("process_remove_identity: " 415 "internal error: tab->nentries %d", 416 tab->nentries); 417 TAILQ_REMOVE(&tab->idlist, id, next); 418 free_identity(id); 419 tab->nentries--; 420 success = 1; 421 } 422 key_free(key); 423 } 424 buffer_put_int(&e->output, 1); 425 buffer_put_char(&e->output, 426 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 427 } 428 429 static void 430 process_remove_all_identities(SocketEntry *e, int version) 431 { 432 Idtab *tab = idtab_lookup(version); 433 Identity *id; 434 435 /* Loop over all identities and clear the keys. */ 436 for (id = TAILQ_FIRST(&tab->idlist); id; 437 id = TAILQ_FIRST(&tab->idlist)) { 438 TAILQ_REMOVE(&tab->idlist, id, next); 439 free_identity(id); 440 } 441 442 /* Mark that there are no identities. */ 443 tab->nentries = 0; 444 445 /* Send success. */ 446 buffer_put_int(&e->output, 1); 447 buffer_put_char(&e->output, SSH_AGENT_SUCCESS); 448 } 449 450 /* removes expired keys and returns number of seconds until the next expiry */ 451 static time_t 452 reaper(void) 453 { 454 time_t deadline = 0, now = monotime(); 455 Identity *id, *nxt; 456 int version; 457 Idtab *tab; 458 459 for (version = 1; version < 3; version++) { 460 tab = idtab_lookup(version); 461 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { 462 nxt = TAILQ_NEXT(id, next); 463 if (id->death == 0) 464 continue; 465 if (now >= id->death) { 466 debug("expiring key '%s'", id->comment); 467 TAILQ_REMOVE(&tab->idlist, id, next); 468 free_identity(id); 469 tab->nentries--; 470 } else 471 deadline = (deadline == 0) ? id->death : 472 MIN(deadline, id->death); 473 } 474 } 475 if (deadline == 0 || deadline <= now) 476 return 0; 477 else 478 return (deadline - now); 479 } 480 481 static void 482 process_add_identity(SocketEntry *e, int version) 483 { 484 Idtab *tab = idtab_lookup(version); 485 Identity *id; 486 int type, success = 0, confirm = 0; 487 char *type_name, *comment; 488 time_t death = 0; 489 Key *k = NULL; 490 #ifdef OPENSSL_HAS_ECC 491 BIGNUM *exponent; 492 EC_POINT *q; 493 char *curve; 494 #endif 495 u_char *cert; 496 u_int len; 497 498 switch (version) { 499 case 1: 500 k = key_new_private(KEY_RSA1); 501 (void) buffer_get_int(&e->request); /* ignored */ 502 buffer_get_bignum(&e->request, k->rsa->n); 503 buffer_get_bignum(&e->request, k->rsa->e); 504 buffer_get_bignum(&e->request, k->rsa->d); 505 buffer_get_bignum(&e->request, k->rsa->iqmp); 506 507 /* SSH and SSL have p and q swapped */ 508 buffer_get_bignum(&e->request, k->rsa->q); /* p */ 509 buffer_get_bignum(&e->request, k->rsa->p); /* q */ 510 511 /* Generate additional parameters */ 512 rsa_generate_additional_parameters(k->rsa); 513 break; 514 case 2: 515 type_name = buffer_get_string(&e->request, NULL); 516 type = key_type_from_name(type_name); 517 switch (type) { 518 case KEY_DSA: 519 k = key_new_private(type); 520 buffer_get_bignum2(&e->request, k->dsa->p); 521 buffer_get_bignum2(&e->request, k->dsa->q); 522 buffer_get_bignum2(&e->request, k->dsa->g); 523 buffer_get_bignum2(&e->request, k->dsa->pub_key); 524 buffer_get_bignum2(&e->request, k->dsa->priv_key); 525 break; 526 case KEY_DSA_CERT_V00: 527 case KEY_DSA_CERT: 528 cert = buffer_get_string(&e->request, &len); 529 if ((k = key_from_blob(cert, len)) == NULL) 530 fatal("Certificate parse failed"); 531 free(cert); 532 key_add_private(k); 533 buffer_get_bignum2(&e->request, k->dsa->priv_key); 534 break; 535 #ifdef OPENSSL_HAS_ECC 536 case KEY_ECDSA: 537 k = key_new_private(type); 538 k->ecdsa_nid = key_ecdsa_nid_from_name(type_name); 539 curve = buffer_get_string(&e->request, NULL); 540 if (k->ecdsa_nid != key_curve_name_to_nid(curve)) 541 fatal("%s: curve names mismatch", __func__); 542 free(curve); 543 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 544 if (k->ecdsa == NULL) 545 fatal("%s: EC_KEY_new_by_curve_name failed", 546 __func__); 547 q = EC_POINT_new(EC_KEY_get0_group(k->ecdsa)); 548 if (q == NULL) 549 fatal("%s: BN_new failed", __func__); 550 if ((exponent = BN_new()) == NULL) 551 fatal("%s: BN_new failed", __func__); 552 buffer_get_ecpoint(&e->request, 553 EC_KEY_get0_group(k->ecdsa), q); 554 buffer_get_bignum2(&e->request, exponent); 555 if (EC_KEY_set_public_key(k->ecdsa, q) != 1) 556 fatal("%s: EC_KEY_set_public_key failed", 557 __func__); 558 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) 559 fatal("%s: EC_KEY_set_private_key failed", 560 __func__); 561 if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 562 EC_KEY_get0_public_key(k->ecdsa)) != 0) 563 fatal("%s: bad ECDSA public key", __func__); 564 if (key_ec_validate_private(k->ecdsa) != 0) 565 fatal("%s: bad ECDSA private key", __func__); 566 BN_clear_free(exponent); 567 EC_POINT_free(q); 568 break; 569 case KEY_ECDSA_CERT: 570 cert = buffer_get_string(&e->request, &len); 571 if ((k = key_from_blob(cert, len)) == NULL) 572 fatal("Certificate parse failed"); 573 free(cert); 574 key_add_private(k); 575 if ((exponent = BN_new()) == NULL) 576 fatal("%s: BN_new failed", __func__); 577 buffer_get_bignum2(&e->request, exponent); 578 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) 579 fatal("%s: EC_KEY_set_private_key failed", 580 __func__); 581 if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 582 EC_KEY_get0_public_key(k->ecdsa)) != 0 || 583 key_ec_validate_private(k->ecdsa) != 0) 584 fatal("%s: bad ECDSA key", __func__); 585 BN_clear_free(exponent); 586 break; 587 #endif /* OPENSSL_HAS_ECC */ 588 case KEY_RSA: 589 k = key_new_private(type); 590 buffer_get_bignum2(&e->request, k->rsa->n); 591 buffer_get_bignum2(&e->request, k->rsa->e); 592 buffer_get_bignum2(&e->request, k->rsa->d); 593 buffer_get_bignum2(&e->request, k->rsa->iqmp); 594 buffer_get_bignum2(&e->request, k->rsa->p); 595 buffer_get_bignum2(&e->request, k->rsa->q); 596 597 /* Generate additional parameters */ 598 rsa_generate_additional_parameters(k->rsa); 599 break; 600 case KEY_RSA_CERT_V00: 601 case KEY_RSA_CERT: 602 cert = buffer_get_string(&e->request, &len); 603 if ((k = key_from_blob(cert, len)) == NULL) 604 fatal("Certificate parse failed"); 605 free(cert); 606 key_add_private(k); 607 buffer_get_bignum2(&e->request, k->rsa->d); 608 buffer_get_bignum2(&e->request, k->rsa->iqmp); 609 buffer_get_bignum2(&e->request, k->rsa->p); 610 buffer_get_bignum2(&e->request, k->rsa->q); 611 break; 612 default: 613 free(type_name); 614 buffer_clear(&e->request); 615 goto send; 616 } 617 free(type_name); 618 break; 619 } 620 /* enable blinding */ 621 switch (k->type) { 622 case KEY_RSA: 623 case KEY_RSA_CERT_V00: 624 case KEY_RSA_CERT: 625 case KEY_RSA1: 626 if (RSA_blinding_on(k->rsa, NULL) != 1) { 627 error("process_add_identity: RSA_blinding_on failed"); 628 key_free(k); 629 goto send; 630 } 631 break; 632 } 633 comment = buffer_get_string(&e->request, NULL); 634 if (k == NULL) { 635 free(comment); 636 goto send; 637 } 638 while (buffer_len(&e->request)) { 639 switch ((type = buffer_get_char(&e->request))) { 640 case SSH_AGENT_CONSTRAIN_LIFETIME: 641 death = monotime() + buffer_get_int(&e->request); 642 break; 643 case SSH_AGENT_CONSTRAIN_CONFIRM: 644 confirm = 1; 645 break; 646 default: 647 error("process_add_identity: " 648 "Unknown constraint type %d", type); 649 free(comment); 650 key_free(k); 651 goto send; 652 } 653 } 654 success = 1; 655 if (lifetime && !death) 656 death = monotime() + lifetime; 657 if ((id = lookup_identity(k, version)) == NULL) { 658 id = xcalloc(1, sizeof(Identity)); 659 id->key = k; 660 TAILQ_INSERT_TAIL(&tab->idlist, id, next); 661 /* Increment the number of identities. */ 662 tab->nentries++; 663 } else { 664 key_free(k); 665 free(id->comment); 666 } 667 id->comment = comment; 668 id->death = death; 669 id->confirm = confirm; 670 send: 671 buffer_put_int(&e->output, 1); 672 buffer_put_char(&e->output, 673 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 674 } 675 676 /* XXX todo: encrypt sensitive data with passphrase */ 677 static void 678 process_lock_agent(SocketEntry *e, int lock) 679 { 680 int success = 0; 681 char *passwd; 682 683 passwd = buffer_get_string(&e->request, NULL); 684 if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { 685 locked = 0; 686 memset(lock_passwd, 0, strlen(lock_passwd)); 687 free(lock_passwd); 688 lock_passwd = NULL; 689 success = 1; 690 } else if (!locked && lock) { 691 locked = 1; 692 lock_passwd = xstrdup(passwd); 693 success = 1; 694 } 695 memset(passwd, 0, strlen(passwd)); 696 free(passwd); 697 698 buffer_put_int(&e->output, 1); 699 buffer_put_char(&e->output, 700 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 701 } 702 703 static void 704 no_identities(SocketEntry *e, u_int type) 705 { 706 Buffer msg; 707 708 buffer_init(&msg); 709 buffer_put_char(&msg, 710 (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? 711 SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); 712 buffer_put_int(&msg, 0); 713 buffer_put_int(&e->output, buffer_len(&msg)); 714 buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); 715 buffer_free(&msg); 716 } 717 718 #ifdef ENABLE_PKCS11 719 static void 720 process_add_smartcard_key(SocketEntry *e) 721 { 722 char *provider = NULL, *pin; 723 int i, type, version, count = 0, success = 0, confirm = 0; 724 time_t death = 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 = monotime() + 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 = monotime() + 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 free(pin); 771 free(provider); 772 free(keys); 773 buffer_put_int(&e->output, 1); 774 buffer_put_char(&e->output, 775 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 776 } 777 778 static void 779 process_remove_smartcard_key(SocketEntry *e) 780 { 781 char *provider = NULL, *pin = NULL; 782 int version, success = 0; 783 Identity *id, *nxt; 784 Idtab *tab; 785 786 provider = buffer_get_string(&e->request, NULL); 787 pin = buffer_get_string(&e->request, NULL); 788 free(pin); 789 790 for (version = 1; version < 3; version++) { 791 tab = idtab_lookup(version); 792 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { 793 nxt = TAILQ_NEXT(id, next); 794 if (!strcmp(provider, id->provider)) { 795 TAILQ_REMOVE(&tab->idlist, id, next); 796 free_identity(id); 797 tab->nentries--; 798 } 799 } 800 } 801 if (pkcs11_del_provider(provider) == 0) 802 success = 1; 803 else 804 error("process_remove_smartcard_key:" 805 " pkcs11_del_provider failed"); 806 free(provider); 807 buffer_put_int(&e->output, 1); 808 buffer_put_char(&e->output, 809 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 810 } 811 #endif /* ENABLE_PKCS11 */ 812 813 /* dispatch incoming messages */ 814 815 static void 816 process_message(SocketEntry *e) 817 { 818 u_int msg_len, type; 819 u_char *cp; 820 821 if (buffer_len(&e->input) < 5) 822 return; /* Incomplete message. */ 823 cp = buffer_ptr(&e->input); 824 msg_len = get_u32(cp); 825 if (msg_len > 256 * 1024) { 826 close_socket(e); 827 return; 828 } 829 if (buffer_len(&e->input) < msg_len + 4) 830 return; 831 832 /* move the current input to e->request */ 833 buffer_consume(&e->input, 4); 834 buffer_clear(&e->request); 835 buffer_append(&e->request, buffer_ptr(&e->input), msg_len); 836 buffer_consume(&e->input, msg_len); 837 type = buffer_get_char(&e->request); 838 839 /* check wheter agent is locked */ 840 if (locked && type != SSH_AGENTC_UNLOCK) { 841 buffer_clear(&e->request); 842 switch (type) { 843 case SSH_AGENTC_REQUEST_RSA_IDENTITIES: 844 case SSH2_AGENTC_REQUEST_IDENTITIES: 845 /* send empty lists */ 846 no_identities(e, type); 847 break; 848 default: 849 /* send a fail message for all other request types */ 850 buffer_put_int(&e->output, 1); 851 buffer_put_char(&e->output, SSH_AGENT_FAILURE); 852 } 853 return; 854 } 855 856 debug("type %d", type); 857 switch (type) { 858 case SSH_AGENTC_LOCK: 859 case SSH_AGENTC_UNLOCK: 860 process_lock_agent(e, type == SSH_AGENTC_LOCK); 861 break; 862 /* ssh1 */ 863 case SSH_AGENTC_RSA_CHALLENGE: 864 process_authentication_challenge1(e); 865 break; 866 case SSH_AGENTC_REQUEST_RSA_IDENTITIES: 867 process_request_identities(e, 1); 868 break; 869 case SSH_AGENTC_ADD_RSA_IDENTITY: 870 case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: 871 process_add_identity(e, 1); 872 break; 873 case SSH_AGENTC_REMOVE_RSA_IDENTITY: 874 process_remove_identity(e, 1); 875 break; 876 case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: 877 process_remove_all_identities(e, 1); 878 break; 879 /* ssh2 */ 880 case SSH2_AGENTC_SIGN_REQUEST: 881 process_sign_request2(e); 882 break; 883 case SSH2_AGENTC_REQUEST_IDENTITIES: 884 process_request_identities(e, 2); 885 break; 886 case SSH2_AGENTC_ADD_IDENTITY: 887 case SSH2_AGENTC_ADD_ID_CONSTRAINED: 888 process_add_identity(e, 2); 889 break; 890 case SSH2_AGENTC_REMOVE_IDENTITY: 891 process_remove_identity(e, 2); 892 break; 893 case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: 894 process_remove_all_identities(e, 2); 895 break; 896 #ifdef ENABLE_PKCS11 897 case SSH_AGENTC_ADD_SMARTCARD_KEY: 898 case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: 899 process_add_smartcard_key(e); 900 break; 901 case SSH_AGENTC_REMOVE_SMARTCARD_KEY: 902 process_remove_smartcard_key(e); 903 break; 904 #endif /* ENABLE_PKCS11 */ 905 default: 906 /* Unknown message. Respond with failure. */ 907 error("Unknown message %d", type); 908 buffer_clear(&e->request); 909 buffer_put_int(&e->output, 1); 910 buffer_put_char(&e->output, SSH_AGENT_FAILURE); 911 break; 912 } 913 } 914 915 static void 916 new_socket(sock_type type, int fd) 917 { 918 u_int i, old_alloc, new_alloc; 919 920 if (type == AUTH_CONNECTION) { 921 debug("xcount %d -> %d", xcount, xcount + 1); 922 ++xcount; 923 } 924 set_nonblock(fd); 925 926 if (fd > max_fd) 927 max_fd = fd; 928 929 for (i = 0; i < sockets_alloc; i++) 930 if (sockets[i].type == AUTH_UNUSED) { 931 sockets[i].fd = fd; 932 buffer_init(&sockets[i].input); 933 buffer_init(&sockets[i].output); 934 buffer_init(&sockets[i].request); 935 sockets[i].type = type; 936 return; 937 } 938 old_alloc = sockets_alloc; 939 new_alloc = sockets_alloc + 10; 940 sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); 941 for (i = old_alloc; i < new_alloc; i++) 942 sockets[i].type = AUTH_UNUSED; 943 sockets_alloc = new_alloc; 944 sockets[old_alloc].fd = fd; 945 buffer_init(&sockets[old_alloc].input); 946 buffer_init(&sockets[old_alloc].output); 947 buffer_init(&sockets[old_alloc].request); 948 sockets[old_alloc].type = type; 949 } 950 951 static int 952 prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp, 953 struct timeval **tvpp) 954 { 955 u_int i, sz; 956 int n = 0; 957 static struct timeval tv; 958 time_t deadline; 959 960 for (i = 0; i < sockets_alloc; i++) { 961 switch (sockets[i].type) { 962 case AUTH_SOCKET: 963 case AUTH_CONNECTION: 964 n = MAX(n, sockets[i].fd); 965 break; 966 case AUTH_UNUSED: 967 break; 968 default: 969 fatal("Unknown socket type %d", sockets[i].type); 970 break; 971 } 972 } 973 974 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); 975 if (*fdrp == NULL || sz > *nallocp) { 976 free(*fdrp); 977 free(*fdwp); 978 *fdrp = xmalloc(sz); 979 *fdwp = xmalloc(sz); 980 *nallocp = sz; 981 } 982 if (n < *fdl) 983 debug("XXX shrink: %d < %d", n, *fdl); 984 *fdl = n; 985 memset(*fdrp, 0, sz); 986 memset(*fdwp, 0, sz); 987 988 for (i = 0; i < sockets_alloc; i++) { 989 switch (sockets[i].type) { 990 case AUTH_SOCKET: 991 case AUTH_CONNECTION: 992 FD_SET(sockets[i].fd, *fdrp); 993 if (buffer_len(&sockets[i].output) > 0) 994 FD_SET(sockets[i].fd, *fdwp); 995 break; 996 default: 997 break; 998 } 999 } 1000 deadline = reaper(); 1001 if (parent_alive_interval != 0) 1002 deadline = (deadline == 0) ? parent_alive_interval : 1003 MIN(deadline, parent_alive_interval); 1004 if (deadline == 0) { 1005 *tvpp = NULL; 1006 } else { 1007 tv.tv_sec = deadline; 1008 tv.tv_usec = 0; 1009 *tvpp = &tv; 1010 } 1011 return (1); 1012 } 1013 1014 static void 1015 after_select(fd_set *readset, fd_set *writeset) 1016 { 1017 struct sockaddr_un sunaddr; 1018 socklen_t slen; 1019 char buf[1024]; 1020 int len, sock; 1021 u_int i, orig_alloc; 1022 uid_t euid; 1023 gid_t egid; 1024 1025 for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++) 1026 switch (sockets[i].type) { 1027 case AUTH_UNUSED: 1028 break; 1029 case AUTH_SOCKET: 1030 if (FD_ISSET(sockets[i].fd, readset)) { 1031 slen = sizeof(sunaddr); 1032 sock = accept(sockets[i].fd, 1033 (struct sockaddr *)&sunaddr, &slen); 1034 if (sock < 0) { 1035 error("accept from AUTH_SOCKET: %s", 1036 strerror(errno)); 1037 break; 1038 } 1039 if (getpeereid(sock, &euid, &egid) < 0) { 1040 error("getpeereid %d failed: %s", 1041 sock, strerror(errno)); 1042 close(sock); 1043 break; 1044 } 1045 if ((euid != 0) && (getuid() != euid)) { 1046 error("uid mismatch: " 1047 "peer euid %u != uid %u", 1048 (u_int) euid, (u_int) getuid()); 1049 close(sock); 1050 break; 1051 } 1052 new_socket(AUTH_CONNECTION, sock); 1053 } 1054 break; 1055 case AUTH_CONNECTION: 1056 if (buffer_len(&sockets[i].output) > 0 && 1057 FD_ISSET(sockets[i].fd, writeset)) { 1058 len = write(sockets[i].fd, 1059 buffer_ptr(&sockets[i].output), 1060 buffer_len(&sockets[i].output)); 1061 if (len == -1 && (errno == EAGAIN || 1062 errno == EWOULDBLOCK || 1063 errno == EINTR)) 1064 continue; 1065 if (len <= 0) { 1066 close_socket(&sockets[i]); 1067 break; 1068 } 1069 buffer_consume(&sockets[i].output, len); 1070 } 1071 if (FD_ISSET(sockets[i].fd, readset)) { 1072 len = read(sockets[i].fd, buf, sizeof(buf)); 1073 if (len == -1 && (errno == EAGAIN || 1074 errno == EWOULDBLOCK || 1075 errno == EINTR)) 1076 continue; 1077 if (len <= 0) { 1078 close_socket(&sockets[i]); 1079 break; 1080 } 1081 buffer_append(&sockets[i].input, buf, len); 1082 process_message(&sockets[i]); 1083 } 1084 break; 1085 default: 1086 fatal("Unknown type %d", sockets[i].type); 1087 } 1088 } 1089 1090 static void 1091 cleanup_socket(void) 1092 { 1093 if (socket_name[0]) 1094 unlink(socket_name); 1095 if (socket_dir[0]) 1096 rmdir(socket_dir); 1097 } 1098 1099 void 1100 cleanup_exit(int i) 1101 { 1102 cleanup_socket(); 1103 _exit(i); 1104 } 1105 1106 /*ARGSUSED*/ 1107 static void 1108 cleanup_handler(int sig) 1109 { 1110 cleanup_socket(); 1111 #ifdef ENABLE_PKCS11 1112 pkcs11_terminate(); 1113 #endif 1114 _exit(2); 1115 } 1116 1117 static void 1118 check_parent_exists(void) 1119 { 1120 /* 1121 * If our parent has exited then getppid() will return (pid_t)1, 1122 * so testing for that should be safe. 1123 */ 1124 if (parent_pid != -1 && getppid() != parent_pid) { 1125 /* printf("Parent has died - Authentication agent exiting.\n"); */ 1126 cleanup_socket(); 1127 _exit(2); 1128 } 1129 } 1130 1131 static void 1132 usage(void) 1133 { 1134 fprintf(stderr, "usage: %s [options] [command [arg ...]]\n", 1135 __progname); 1136 fprintf(stderr, "Options:\n"); 1137 fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); 1138 fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); 1139 fprintf(stderr, " -k Kill the current agent.\n"); 1140 fprintf(stderr, " -d Debug mode.\n"); 1141 fprintf(stderr, " -a socket Bind agent socket to given name.\n"); 1142 fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); 1143 fprintf(stderr, " -x Exit when the last client disconnects.\n"); 1144 exit(1); 1145 } 1146 1147 int 1148 main(int ac, char **av) 1149 { 1150 int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; 1151 int sock, fd, ch, result, saved_errno; 1152 u_int nalloc; 1153 char *shell, *format, *pidstr, *agentsocket = NULL; 1154 fd_set *readsetp = NULL, *writesetp = NULL; 1155 struct sockaddr_un sunaddr; 1156 #ifdef HAVE_SETRLIMIT 1157 struct rlimit rlim; 1158 #endif 1159 int prev_mask; 1160 extern int optind; 1161 extern char *optarg; 1162 pid_t pid; 1163 char pidstrbuf[1 + 3 * sizeof pid]; 1164 struct timeval *tvp = NULL; 1165 size_t len; 1166 1167 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1168 sanitise_stdfd(); 1169 1170 /* drop */ 1171 setegid(getgid()); 1172 setgid(getgid()); 1173 setuid(geteuid()); 1174 1175 #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) 1176 /* Disable ptrace on Linux without sgid bit */ 1177 prctl(PR_SET_DUMPABLE, 0); 1178 #endif 1179 1180 OpenSSL_add_all_algorithms(); 1181 1182 __progname = ssh_get_progname(av[0]); 1183 seed_rng(); 1184 1185 while ((ch = getopt(ac, av, "cdksa:t:x")) != -1) { 1186 switch (ch) { 1187 case 'c': 1188 if (s_flag) 1189 usage(); 1190 c_flag++; 1191 break; 1192 case 'k': 1193 k_flag++; 1194 break; 1195 case 's': 1196 if (c_flag) 1197 usage(); 1198 s_flag++; 1199 break; 1200 case 'd': 1201 if (d_flag) 1202 usage(); 1203 d_flag++; 1204 break; 1205 case 'a': 1206 agentsocket = optarg; 1207 break; 1208 case 't': 1209 if ((lifetime = convtime(optarg)) == -1) { 1210 fprintf(stderr, "Invalid lifetime\n"); 1211 usage(); 1212 } 1213 break; 1214 case 'x': 1215 xcount = 0; 1216 break; 1217 default: 1218 usage(); 1219 } 1220 } 1221 ac -= optind; 1222 av += optind; 1223 1224 if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) 1225 usage(); 1226 1227 if (ac == 0 && !c_flag && !s_flag) { 1228 shell = getenv("SHELL"); 1229 if (shell != NULL && (len = strlen(shell)) > 2 && 1230 strncmp(shell + len - 3, "csh", 3) == 0) 1231 c_flag = 1; 1232 } 1233 if (k_flag) { 1234 const char *errstr = NULL; 1235 1236 pidstr = getenv(SSH_AGENTPID_ENV_NAME); 1237 if (pidstr == NULL) { 1238 fprintf(stderr, "%s not set, cannot kill agent\n", 1239 SSH_AGENTPID_ENV_NAME); 1240 exit(1); 1241 } 1242 pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); 1243 if (errstr) { 1244 fprintf(stderr, 1245 "%s=\"%s\", which is not a good PID: %s\n", 1246 SSH_AGENTPID_ENV_NAME, pidstr, errstr); 1247 exit(1); 1248 } 1249 if (kill(pid, SIGTERM) == -1) { 1250 perror("kill"); 1251 exit(1); 1252 } 1253 format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; 1254 printf(format, SSH_AUTHSOCKET_ENV_NAME); 1255 printf(format, SSH_AGENTPID_ENV_NAME); 1256 printf("echo Agent pid %ld killed;\n", (long)pid); 1257 exit(0); 1258 } 1259 parent_pid = getpid(); 1260 1261 if (agentsocket == NULL) { 1262 /* Create private directory for agent socket */ 1263 mktemp_proto(socket_dir, sizeof(socket_dir)); 1264 if (mkdtemp(socket_dir) == NULL) { 1265 perror("mkdtemp: private socket dir"); 1266 exit(1); 1267 } 1268 snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, 1269 (long)parent_pid); 1270 } else { 1271 /* Try to use specified agent socket */ 1272 socket_dir[0] = '\0'; 1273 strlcpy(socket_name, agentsocket, sizeof socket_name); 1274 } 1275 1276 /* 1277 * Create socket early so it will exist before command gets run from 1278 * the parent. 1279 */ 1280 sock = socket(AF_UNIX, SOCK_STREAM, 0); 1281 if (sock < 0) { 1282 perror("socket"); 1283 *socket_name = '\0'; /* Don't unlink any existing file */ 1284 cleanup_exit(1); 1285 } 1286 memset(&sunaddr, 0, sizeof(sunaddr)); 1287 sunaddr.sun_family = AF_UNIX; 1288 strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); 1289 prev_mask = umask(0177); 1290 if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { 1291 perror("bind"); 1292 *socket_name = '\0'; /* Don't unlink any existing file */ 1293 umask(prev_mask); 1294 cleanup_exit(1); 1295 } 1296 umask(prev_mask); 1297 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { 1298 perror("listen"); 1299 cleanup_exit(1); 1300 } 1301 1302 /* 1303 * Fork, and have the parent execute the command, if any, or present 1304 * the socket data. The child continues as the authentication agent. 1305 */ 1306 if (d_flag) { 1307 log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); 1308 format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; 1309 printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, 1310 SSH_AUTHSOCKET_ENV_NAME); 1311 printf("echo Agent pid %ld;\n", (long)parent_pid); 1312 goto skip; 1313 } 1314 pid = fork(); 1315 if (pid == -1) { 1316 perror("fork"); 1317 cleanup_exit(1); 1318 } 1319 if (pid != 0) { /* Parent - execute the given command. */ 1320 close(sock); 1321 snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); 1322 if (ac == 0) { 1323 format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; 1324 printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, 1325 SSH_AUTHSOCKET_ENV_NAME); 1326 printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, 1327 SSH_AGENTPID_ENV_NAME); 1328 printf("echo Agent pid %ld;\n", (long)pid); 1329 exit(0); 1330 } 1331 if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || 1332 setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { 1333 perror("setenv"); 1334 exit(1); 1335 } 1336 execvp(av[0], av); 1337 perror(av[0]); 1338 exit(1); 1339 } 1340 /* child */ 1341 log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); 1342 1343 if (setsid() == -1) { 1344 error("setsid: %s", strerror(errno)); 1345 cleanup_exit(1); 1346 } 1347 1348 (void)chdir("/"); 1349 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1350 /* XXX might close listen socket */ 1351 (void)dup2(fd, STDIN_FILENO); 1352 (void)dup2(fd, STDOUT_FILENO); 1353 (void)dup2(fd, STDERR_FILENO); 1354 if (fd > 2) 1355 close(fd); 1356 } 1357 1358 #ifdef HAVE_SETRLIMIT 1359 /* deny core dumps, since memory contains unencrypted private keys */ 1360 rlim.rlim_cur = rlim.rlim_max = 0; 1361 if (setrlimit(RLIMIT_CORE, &rlim) < 0) { 1362 error("setrlimit RLIMIT_CORE: %s", strerror(errno)); 1363 cleanup_exit(1); 1364 } 1365 #endif 1366 1367 skip: 1368 1369 #ifdef ENABLE_PKCS11 1370 pkcs11_init(0); 1371 #endif 1372 new_socket(AUTH_SOCKET, sock); 1373 if (ac > 0) 1374 parent_alive_interval = 10; 1375 idtab_init(); 1376 signal(SIGPIPE, SIG_IGN); 1377 signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN); 1378 signal(SIGHUP, cleanup_handler); 1379 signal(SIGTERM, cleanup_handler); 1380 nalloc = 0; 1381 1382 while (1) { 1383 prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp); 1384 result = select(max_fd + 1, readsetp, writesetp, NULL, tvp); 1385 saved_errno = errno; 1386 if (parent_alive_interval != 0) 1387 check_parent_exists(); 1388 (void) reaper(); /* remove expired keys */ 1389 if (result < 0) { 1390 if (saved_errno == EINTR) 1391 continue; 1392 fatal("select: %s", strerror(saved_errno)); 1393 } else if (result > 0) 1394 after_select(readsetp, writesetp); 1395 } 1396 /* NOTREACHED */ 1397 } 1398