1 /* $NetBSD: ssh-agent.c,v 1.14 2015/04/03 23:58:19 christos Exp $ */ 2 /* $OpenBSD: ssh-agent.c,v 1.199 2015/03/04 21:12:59 djm 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 1.14 2015/04/03 23:58:19 christos Exp $"); 40 #include <sys/param.h> /* MIN MAX */ 41 #include <sys/types.h> 42 #include <sys/time.h> 43 #include <sys/queue.h> 44 #include <sys/resource.h> 45 #include <sys/socket.h> 46 #include <sys/stat.h> 47 #include <sys/un.h> 48 49 #ifdef WITH_OPENSSL 50 #include <openssl/evp.h> 51 #endif 52 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <paths.h> 56 #include <signal.h> 57 #include <stdlib.h> 58 #include <stdio.h> 59 #include <string.h> 60 #include <limits.h> 61 #include <time.h> 62 #include <unistd.h> 63 64 #include "key.h" /* XXX for typedef */ 65 #include "buffer.h" /* XXX for typedef */ 66 67 #include "xmalloc.h" 68 #include "ssh.h" 69 #include "rsa.h" 70 #include "sshbuf.h" 71 #include "sshkey.h" 72 #include "authfd.h" 73 #include "compat.h" 74 #include "log.h" 75 #include "misc.h" 76 #include "getpeereid.h" 77 #include "digest.h" 78 #include "ssherr.h" 79 80 #ifdef ENABLE_PKCS11 81 #include "ssh-pkcs11.h" 82 #endif 83 84 typedef enum { 85 AUTH_UNUSED, 86 AUTH_SOCKET, 87 AUTH_CONNECTION 88 } sock_type; 89 90 typedef struct { 91 int fd; 92 sock_type type; 93 struct sshbuf *input; 94 struct sshbuf *output; 95 struct sshbuf *request; 96 } SocketEntry; 97 98 u_int sockets_alloc = 0; 99 SocketEntry *sockets = NULL; 100 101 typedef struct identity { 102 TAILQ_ENTRY(identity) next; 103 struct sshkey *key; 104 char *comment; 105 char *provider; 106 time_t death; 107 u_int confirm; 108 } Identity; 109 110 typedef struct { 111 int nentries; 112 TAILQ_HEAD(idqueue, identity) idlist; 113 } Idtab; 114 115 /* private key table, one per protocol version */ 116 Idtab idtable[3]; 117 118 int max_fd = 0; 119 120 /* pid of shell == parent of agent */ 121 pid_t parent_pid = -1; 122 time_t parent_alive_interval = 0; 123 124 /* pid of process for which cleanup_socket is applicable */ 125 pid_t cleanup_pid = 0; 126 127 /* pathname and directory for AUTH_SOCKET */ 128 char socket_name[PATH_MAX]; 129 char socket_dir[PATH_MAX]; 130 131 /* locking */ 132 int locked = 0; 133 char *lock_passwd = NULL; 134 135 extern char *__progname; 136 137 /* Default lifetime in seconds (0 == forever) */ 138 static long lifetime = 0; 139 140 static int fingerprint_hash = SSH_FP_HASH_DEFAULT; 141 142 static void 143 close_socket(SocketEntry *e) 144 { 145 close(e->fd); 146 e->fd = -1; 147 e->type = AUTH_UNUSED; 148 sshbuf_free(e->input); 149 sshbuf_free(e->output); 150 sshbuf_free(e->request); 151 } 152 153 static void 154 idtab_init(void) 155 { 156 int i; 157 158 for (i = 0; i <=2; i++) { 159 TAILQ_INIT(&idtable[i].idlist); 160 idtable[i].nentries = 0; 161 } 162 } 163 164 /* return private key table for requested protocol version */ 165 static Idtab * 166 idtab_lookup(int version) 167 { 168 if (version < 1 || version > 2) 169 fatal("internal error, bad protocol version %d", version); 170 return &idtable[version]; 171 } 172 173 static void 174 free_identity(Identity *id) 175 { 176 sshkey_free(id->key); 177 free(id->provider); 178 free(id->comment); 179 free(id); 180 } 181 182 /* return matching private key for given public key */ 183 static Identity * 184 lookup_identity(struct sshkey *key, int version) 185 { 186 Identity *id; 187 188 Idtab *tab = idtab_lookup(version); 189 TAILQ_FOREACH(id, &tab->idlist, next) { 190 if (sshkey_equal(key, id->key)) 191 return (id); 192 } 193 return (NULL); 194 } 195 196 /* Check confirmation of keysign request */ 197 static int 198 confirm_key(Identity *id) 199 { 200 char *p; 201 int ret = -1; 202 203 p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT); 204 if (p != NULL && 205 ask_permission("Allow use of key %s?\nKey fingerprint %s.", 206 id->comment, p)) 207 ret = 0; 208 free(p); 209 210 return (ret); 211 } 212 213 static void 214 send_status(SocketEntry *e, int success) 215 { 216 int r; 217 218 if ((r = sshbuf_put_u32(e->output, 1)) != 0 || 219 (r = sshbuf_put_u8(e->output, success ? 220 SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0) 221 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 222 } 223 224 /* send list of supported public keys to 'client' */ 225 static void 226 process_request_identities(SocketEntry *e, int version) 227 { 228 Idtab *tab = idtab_lookup(version); 229 Identity *id; 230 struct sshbuf *msg; 231 int r; 232 233 if ((msg = sshbuf_new()) == NULL) 234 fatal("%s: sshbuf_new failed", __func__); 235 if ((r = sshbuf_put_u8(msg, (version == 1) ? 236 SSH_AGENT_RSA_IDENTITIES_ANSWER : 237 SSH2_AGENT_IDENTITIES_ANSWER)) != 0 || 238 (r = sshbuf_put_u32(msg, tab->nentries)) != 0) 239 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 240 TAILQ_FOREACH(id, &tab->idlist, next) { 241 if (id->key->type == KEY_RSA1) { 242 #ifdef WITH_SSH1 243 if ((r = sshbuf_put_u32(msg, 244 BN_num_bits(id->key->rsa->n))) != 0 || 245 (r = sshbuf_put_bignum1(msg, 246 id->key->rsa->e)) != 0 || 247 (r = sshbuf_put_bignum1(msg, 248 id->key->rsa->n)) != 0) 249 fatal("%s: buffer error: %s", 250 __func__, ssh_err(r)); 251 #endif 252 } else { 253 u_char *blob; 254 size_t blen; 255 256 if ((r = sshkey_to_blob(id->key, &blob, &blen)) != 0) { 257 error("%s: sshkey_to_blob: %s", __func__, 258 ssh_err(r)); 259 continue; 260 } 261 if ((r = sshbuf_put_string(msg, blob, blen)) != 0) 262 fatal("%s: buffer error: %s", 263 __func__, ssh_err(r)); 264 free(blob); 265 } 266 if ((r = sshbuf_put_cstring(msg, id->comment)) != 0) 267 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 268 } 269 if ((r = sshbuf_put_stringb(e->output, msg)) != 0) 270 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 271 sshbuf_free(msg); 272 } 273 274 #ifdef WITH_SSH1 275 /* ssh1 only */ 276 static void 277 process_authentication_challenge1(SocketEntry *e) 278 { 279 u_char buf[32], mdbuf[16], session_id[16]; 280 u_int response_type; 281 BIGNUM *challenge; 282 Identity *id; 283 int r, len; 284 struct sshbuf *msg; 285 struct ssh_digest_ctx *md; 286 struct sshkey *key; 287 288 if ((msg = sshbuf_new()) == NULL) 289 fatal("%s: sshbuf_new failed", __func__); 290 if ((key = sshkey_new(KEY_RSA1)) == NULL) 291 fatal("%s: sshkey_new failed", __func__); 292 if ((challenge = BN_new()) == NULL) 293 fatal("%s: BN_new failed", __func__); 294 295 if ((r = sshbuf_get_u32(e->request, NULL)) != 0 || /* ignored */ 296 (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 || 297 (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0 || 298 (r = sshbuf_get_bignum1(e->request, challenge))) 299 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 300 301 /* Only protocol 1.1 is supported */ 302 if (sshbuf_len(e->request) == 0) 303 goto failure; 304 if ((r = sshbuf_get(e->request, session_id, sizeof(session_id))) != 0 || 305 (r = sshbuf_get_u32(e->request, &response_type)) != 0) 306 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 307 if (response_type != 1) 308 goto failure; 309 310 id = lookup_identity(key, 1); 311 if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { 312 struct sshkey *private = id->key; 313 /* Decrypt the challenge using the private key. */ 314 if ((r = rsa_private_decrypt(challenge, challenge, 315 private->rsa) != 0)) { 316 fatal("%s: rsa_public_encrypt: %s", __func__, 317 ssh_err(r)); 318 goto failure; /* XXX ? */ 319 } 320 321 /* The response is MD5 of decrypted challenge plus session id */ 322 len = BN_num_bytes(challenge); 323 if (len <= 0 || len > 32) { 324 logit("%s: bad challenge length %d", __func__, len); 325 goto failure; 326 } 327 memset(buf, 0, 32); 328 BN_bn2bin(challenge, buf + 32 - len); 329 if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL || 330 ssh_digest_update(md, buf, 32) < 0 || 331 ssh_digest_update(md, session_id, 16) < 0 || 332 ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0) 333 fatal("%s: md5 failed", __func__); 334 ssh_digest_free(md); 335 336 /* Send the response. */ 337 if ((r = sshbuf_put_u8(msg, SSH_AGENT_RSA_RESPONSE)) != 0 || 338 (r = sshbuf_put(msg, mdbuf, sizeof(mdbuf))) != 0) 339 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 340 goto send; 341 } 342 343 failure: 344 /* Unknown identity or protocol error. Send failure. */ 345 if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0) 346 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 347 send: 348 if ((r = sshbuf_put_stringb(e->output, msg)) != 0) 349 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 350 sshkey_free(key); 351 BN_clear_free(challenge); 352 sshbuf_free(msg); 353 } 354 #endif 355 356 /* ssh2 only */ 357 static void 358 process_sign_request2(SocketEntry *e) 359 { 360 u_char *blob, *data, *signature = NULL; 361 size_t blen, dlen, slen = 0; 362 u_int compat = 0, flags; 363 int r, ok = -1; 364 struct sshbuf *msg; 365 struct sshkey *key; 366 struct identity *id; 367 368 if ((msg = sshbuf_new()) == NULL) 369 fatal("%s: sshbuf_new failed", __func__); 370 if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0 || 371 (r = sshbuf_get_string(e->request, &data, &dlen)) != 0 || 372 (r = sshbuf_get_u32(e->request, &flags)) != 0) 373 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 374 if (flags & SSH_AGENT_OLD_SIGNATURE) 375 compat = SSH_BUG_SIGBLOB; 376 if ((r = sshkey_from_blob(blob, blen, &key)) != 0) { 377 error("%s: cannot parse key blob: %s", __func__, ssh_err(ok)); 378 goto send; 379 } 380 if ((id = lookup_identity(key, 2)) == NULL) { 381 verbose("%s: %s key not found", __func__, sshkey_type(key)); 382 goto send; 383 } 384 if (id->confirm && confirm_key(id) != 0) { 385 verbose("%s: user refused key", __func__); 386 goto send; 387 } 388 if ((r = sshkey_sign(id->key, &signature, &slen, 389 data, dlen, compat)) != 0) { 390 error("%s: sshkey_sign: %s", __func__, ssh_err(ok)); 391 goto send; 392 } 393 /* Success */ 394 ok = 0; 395 send: 396 sshkey_free(key); 397 if (ok == 0) { 398 if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 || 399 (r = sshbuf_put_string(msg, signature, slen)) != 0) 400 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 401 } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0) 402 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 403 404 if ((r = sshbuf_put_stringb(e->output, msg)) != 0) 405 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 406 407 sshbuf_free(msg); 408 free(data); 409 free(blob); 410 free(signature); 411 } 412 413 /* shared */ 414 static void 415 process_remove_identity(SocketEntry *e, int version) 416 { 417 size_t blen; 418 int r, success = 0; 419 struct sshkey *key = NULL; 420 u_char *blob; 421 #ifdef WITH_SSH1 422 u_int bits; 423 #endif /* WITH_SSH1 */ 424 425 switch (version) { 426 #ifdef WITH_SSH1 427 case 1: 428 if ((key = sshkey_new(KEY_RSA1)) == NULL) { 429 error("%s: sshkey_new failed", __func__); 430 return; 431 } 432 if ((r = sshbuf_get_u32(e->request, &bits)) != 0 || 433 (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 || 434 (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0) 435 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 436 437 if (bits != sshkey_size(key)) 438 logit("Warning: identity keysize mismatch: " 439 "actual %u, announced %u", 440 sshkey_size(key), bits); 441 break; 442 #endif /* WITH_SSH1 */ 443 case 2: 444 if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0) 445 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 446 if ((r = sshkey_from_blob(blob, blen, &key)) != 0) 447 error("%s: sshkey_from_blob failed: %s", 448 __func__, ssh_err(r)); 449 free(blob); 450 break; 451 } 452 if (key != NULL) { 453 Identity *id = lookup_identity(key, version); 454 if (id != NULL) { 455 /* 456 * We have this key. Free the old key. Since we 457 * don't want to leave empty slots in the middle of 458 * the array, we actually free the key there and move 459 * all the entries between the empty slot and the end 460 * of the array. 461 */ 462 Idtab *tab = idtab_lookup(version); 463 if (tab->nentries < 1) 464 fatal("process_remove_identity: " 465 "internal error: tab->nentries %d", 466 tab->nentries); 467 TAILQ_REMOVE(&tab->idlist, id, next); 468 free_identity(id); 469 tab->nentries--; 470 success = 1; 471 } 472 sshkey_free(key); 473 } 474 send_status(e, success); 475 } 476 477 static void 478 process_remove_all_identities(SocketEntry *e, int version) 479 { 480 Idtab *tab = idtab_lookup(version); 481 Identity *id; 482 483 /* Loop over all identities and clear the keys. */ 484 while ((id = TAILQ_FIRST(&tab->idlist)) != NULL) { 485 TAILQ_REMOVE(&tab->idlist, id, next); 486 free_identity(id); 487 } 488 489 /* Mark that there are no identities. */ 490 tab->nentries = 0; 491 492 /* Send success. */ 493 send_status(e, 1); 494 } 495 496 /* removes expired keys and returns number of seconds until the next expiry */ 497 static time_t 498 reaper(void) 499 { 500 time_t deadline = 0, now = monotime(); 501 Identity *id, *nxt; 502 int version; 503 Idtab *tab; 504 505 for (version = 1; version < 3; version++) { 506 tab = idtab_lookup(version); 507 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { 508 nxt = TAILQ_NEXT(id, next); 509 if (id->death == 0) 510 continue; 511 if (now >= id->death) { 512 debug("expiring key '%s'", id->comment); 513 TAILQ_REMOVE(&tab->idlist, id, next); 514 free_identity(id); 515 tab->nentries--; 516 } else 517 deadline = (deadline == 0) ? id->death : 518 MIN(deadline, id->death); 519 } 520 } 521 if (deadline == 0 || deadline <= now) 522 return 0; 523 else 524 return (deadline - now); 525 } 526 527 /* 528 * XXX this and the corresponding serialisation function probably belongs 529 * in key.c 530 */ 531 #ifdef WITH_SSH1 532 static int 533 agent_decode_rsa1(struct sshbuf *m, struct sshkey **kp) 534 { 535 struct sshkey *k = NULL; 536 int r = SSH_ERR_INTERNAL_ERROR; 537 538 *kp = NULL; 539 if ((k = sshkey_new_private(KEY_RSA1)) == NULL) 540 return SSH_ERR_ALLOC_FAIL; 541 542 if ((r = sshbuf_get_u32(m, NULL)) != 0 || /* ignored */ 543 (r = sshbuf_get_bignum1(m, k->rsa->n)) != 0 || 544 (r = sshbuf_get_bignum1(m, k->rsa->e)) != 0 || 545 (r = sshbuf_get_bignum1(m, k->rsa->d)) != 0 || 546 (r = sshbuf_get_bignum1(m, k->rsa->iqmp)) != 0 || 547 /* SSH1 and SSL have p and q swapped */ 548 (r = sshbuf_get_bignum1(m, k->rsa->q)) != 0 || /* p */ 549 (r = sshbuf_get_bignum1(m, k->rsa->p)) != 0) /* q */ 550 goto out; 551 552 /* Generate additional parameters */ 553 if ((r = rsa_generate_additional_parameters(k->rsa)) != 0) 554 goto out; 555 /* enable blinding */ 556 if (RSA_blinding_on(k->rsa, NULL) != 1) { 557 r = SSH_ERR_LIBCRYPTO_ERROR; 558 goto out; 559 } 560 561 r = 0; /* success */ 562 out: 563 if (r == 0) 564 *kp = k; 565 else 566 sshkey_free(k); 567 return r; 568 } 569 #endif /* WITH_SSH1 */ 570 571 static void 572 process_add_identity(SocketEntry *e, int version) 573 { 574 Idtab *tab = idtab_lookup(version); 575 Identity *id; 576 int success = 0, confirm = 0; 577 u_int seconds; 578 char *comment = NULL; 579 time_t death = 0; 580 struct sshkey *k = NULL; 581 u_char ctype; 582 int r = SSH_ERR_INTERNAL_ERROR; 583 584 switch (version) { 585 #ifdef WITH_SSH1 586 case 1: 587 r = agent_decode_rsa1(e->request, &k); 588 break; 589 #endif /* WITH_SSH1 */ 590 case 2: 591 r = sshkey_private_deserialize(e->request, &k); 592 break; 593 } 594 if (r != 0 || k == NULL || 595 (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) { 596 error("%s: decode private key: %s", __func__, ssh_err(r)); 597 goto err; 598 } 599 600 while (sshbuf_len(e->request)) { 601 if ((r = sshbuf_get_u8(e->request, &ctype)) != 0) { 602 error("%s: buffer error: %s", __func__, ssh_err(r)); 603 goto err; 604 } 605 switch (ctype) { 606 case SSH_AGENT_CONSTRAIN_LIFETIME: 607 if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) { 608 error("%s: bad lifetime constraint: %s", 609 __func__, ssh_err(r)); 610 goto err; 611 } 612 death = monotime() + seconds; 613 break; 614 case SSH_AGENT_CONSTRAIN_CONFIRM: 615 confirm = 1; 616 break; 617 default: 618 error("%s: Unknown constraint %d", __func__, ctype); 619 err: 620 sshbuf_reset(e->request); 621 free(comment); 622 sshkey_free(k); 623 goto send; 624 } 625 } 626 627 success = 1; 628 if (lifetime && !death) 629 death = monotime() + lifetime; 630 if ((id = lookup_identity(k, version)) == NULL) { 631 id = xcalloc(1, sizeof(Identity)); 632 id->key = k; 633 TAILQ_INSERT_TAIL(&tab->idlist, id, next); 634 /* Increment the number of identities. */ 635 tab->nentries++; 636 } else { 637 sshkey_free(k); 638 free(id->comment); 639 } 640 id->comment = comment; 641 id->death = death; 642 id->confirm = confirm; 643 send: 644 send_status(e, success); 645 } 646 647 /* XXX todo: encrypt sensitive data with passphrase */ 648 static void 649 process_lock_agent(SocketEntry *e, int lock) 650 { 651 int r, success = 0; 652 char *passwd; 653 654 if ((r = sshbuf_get_cstring(e->request, &passwd, NULL)) != 0) 655 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 656 if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { 657 locked = 0; 658 explicit_bzero(lock_passwd, strlen(lock_passwd)); 659 free(lock_passwd); 660 lock_passwd = NULL; 661 success = 1; 662 } else if (!locked && lock) { 663 locked = 1; 664 lock_passwd = xstrdup(passwd); 665 success = 1; 666 } 667 explicit_bzero(passwd, strlen(passwd)); 668 free(passwd); 669 send_status(e, success); 670 } 671 672 static void 673 no_identities(SocketEntry *e, u_int type) 674 { 675 struct sshbuf *msg; 676 int r; 677 678 if ((msg = sshbuf_new()) == NULL) 679 fatal("%s: sshbuf_new failed", __func__); 680 if ((r = sshbuf_put_u8(msg, 681 (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? 682 SSH_AGENT_RSA_IDENTITIES_ANSWER : 683 SSH2_AGENT_IDENTITIES_ANSWER)) != 0 || 684 (r = sshbuf_put_u32(msg, 0)) != 0 || 685 (r = sshbuf_put_stringb(e->output, msg)) != 0) 686 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 687 sshbuf_free(msg); 688 } 689 690 #ifdef ENABLE_PKCS11 691 static void 692 process_add_smartcard_key(SocketEntry *e) 693 { 694 char *provider = NULL, *pin; 695 int r, i, version, count = 0, success = 0, confirm = 0; 696 u_int seconds; 697 time_t death = 0; 698 u_char type; 699 struct sshkey **keys = NULL, *k; 700 Identity *id; 701 Idtab *tab; 702 703 if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 || 704 (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) 705 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 706 707 while (sshbuf_len(e->request)) { 708 if ((r = sshbuf_get_u8(e->request, &type)) != 0) 709 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 710 switch (type) { 711 case SSH_AGENT_CONSTRAIN_LIFETIME: 712 if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) 713 fatal("%s: buffer error: %s", 714 __func__, ssh_err(r)); 715 death = monotime() + seconds; 716 break; 717 case SSH_AGENT_CONSTRAIN_CONFIRM: 718 confirm = 1; 719 break; 720 default: 721 error("process_add_smartcard_key: " 722 "Unknown constraint type %d", type); 723 goto send; 724 } 725 } 726 if (lifetime && !death) 727 death = monotime() + lifetime; 728 729 count = pkcs11_add_provider(provider, pin, &keys); 730 for (i = 0; i < count; i++) { 731 k = keys[i]; 732 version = k->type == KEY_RSA1 ? 1 : 2; 733 tab = idtab_lookup(version); 734 if (lookup_identity(k, version) == NULL) { 735 id = xcalloc(1, sizeof(Identity)); 736 id->key = k; 737 id->provider = xstrdup(provider); 738 id->comment = xstrdup(provider); /* XXX */ 739 id->death = death; 740 id->confirm = confirm; 741 TAILQ_INSERT_TAIL(&tab->idlist, id, next); 742 tab->nentries++; 743 success = 1; 744 } else { 745 sshkey_free(k); 746 } 747 keys[i] = NULL; 748 } 749 send: 750 free(pin); 751 free(provider); 752 free(keys); 753 send_status(e, success); 754 } 755 756 static void 757 process_remove_smartcard_key(SocketEntry *e) 758 { 759 char *provider = NULL, *pin = NULL; 760 int r, version, success = 0; 761 Identity *id, *nxt; 762 Idtab *tab; 763 764 if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 || 765 (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) 766 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 767 free(pin); 768 769 for (version = 1; version < 3; version++) { 770 tab = idtab_lookup(version); 771 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { 772 nxt = TAILQ_NEXT(id, next); 773 /* Skip file--based keys */ 774 if (id->provider == NULL) 775 continue; 776 if (!strcmp(provider, id->provider)) { 777 TAILQ_REMOVE(&tab->idlist, id, next); 778 free_identity(id); 779 tab->nentries--; 780 } 781 } 782 } 783 if (pkcs11_del_provider(provider) == 0) 784 success = 1; 785 else 786 error("process_remove_smartcard_key:" 787 " pkcs11_del_provider failed"); 788 free(provider); 789 send_status(e, success); 790 } 791 #endif /* ENABLE_PKCS11 */ 792 793 /* dispatch incoming messages */ 794 795 static void 796 process_message(SocketEntry *e) 797 { 798 u_int msg_len; 799 u_char type; 800 const u_char *cp; 801 int r; 802 803 if (sshbuf_len(e->input) < 5) 804 return; /* Incomplete message. */ 805 cp = sshbuf_ptr(e->input); 806 msg_len = PEEK_U32(cp); 807 if (msg_len > 256 * 1024) { 808 close_socket(e); 809 return; 810 } 811 if (sshbuf_len(e->input) < msg_len + 4) 812 return; 813 814 /* move the current input to e->request */ 815 sshbuf_reset(e->request); 816 if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 || 817 (r = sshbuf_get_u8(e->request, &type)) != 0) 818 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 819 820 /* check wheter agent is locked */ 821 if (locked && type != SSH_AGENTC_UNLOCK) { 822 sshbuf_reset(e->request); 823 switch (type) { 824 case SSH_AGENTC_REQUEST_RSA_IDENTITIES: 825 case SSH2_AGENTC_REQUEST_IDENTITIES: 826 /* send empty lists */ 827 no_identities(e, type); 828 break; 829 default: 830 /* send a fail message for all other request types */ 831 send_status(e, 0); 832 } 833 return; 834 } 835 836 debug("type %d", type); 837 switch (type) { 838 case SSH_AGENTC_LOCK: 839 case SSH_AGENTC_UNLOCK: 840 process_lock_agent(e, type == SSH_AGENTC_LOCK); 841 break; 842 #ifdef WITH_SSH1 843 /* ssh1 */ 844 case SSH_AGENTC_RSA_CHALLENGE: 845 process_authentication_challenge1(e); 846 break; 847 case SSH_AGENTC_REQUEST_RSA_IDENTITIES: 848 process_request_identities(e, 1); 849 break; 850 case SSH_AGENTC_ADD_RSA_IDENTITY: 851 case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: 852 process_add_identity(e, 1); 853 break; 854 case SSH_AGENTC_REMOVE_RSA_IDENTITY: 855 process_remove_identity(e, 1); 856 break; 857 #endif 858 case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: 859 process_remove_all_identities(e, 1); /* safe for !WITH_SSH1 */ 860 break; 861 /* ssh2 */ 862 case SSH2_AGENTC_SIGN_REQUEST: 863 process_sign_request2(e); 864 break; 865 case SSH2_AGENTC_REQUEST_IDENTITIES: 866 process_request_identities(e, 2); 867 break; 868 case SSH2_AGENTC_ADD_IDENTITY: 869 case SSH2_AGENTC_ADD_ID_CONSTRAINED: 870 process_add_identity(e, 2); 871 break; 872 case SSH2_AGENTC_REMOVE_IDENTITY: 873 process_remove_identity(e, 2); 874 break; 875 case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: 876 process_remove_all_identities(e, 2); 877 break; 878 #ifdef ENABLE_PKCS11 879 case SSH_AGENTC_ADD_SMARTCARD_KEY: 880 case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: 881 process_add_smartcard_key(e); 882 break; 883 case SSH_AGENTC_REMOVE_SMARTCARD_KEY: 884 process_remove_smartcard_key(e); 885 break; 886 #endif /* ENABLE_PKCS11 */ 887 default: 888 /* Unknown message. Respond with failure. */ 889 error("Unknown message %d", type); 890 sshbuf_reset(e->request); 891 send_status(e, 0); 892 break; 893 } 894 } 895 896 static void 897 new_socket(sock_type type, int fd) 898 { 899 u_int i, old_alloc, new_alloc; 900 901 set_nonblock(fd); 902 903 if (fd > max_fd) 904 max_fd = fd; 905 906 for (i = 0; i < sockets_alloc; i++) 907 if (sockets[i].type == AUTH_UNUSED) { 908 sockets[i].fd = fd; 909 if ((sockets[i].input = sshbuf_new()) == NULL) 910 fatal("%s: sshbuf_new failed", __func__); 911 if ((sockets[i].output = sshbuf_new()) == NULL) 912 fatal("%s: sshbuf_new failed", __func__); 913 if ((sockets[i].request = sshbuf_new()) == NULL) 914 fatal("%s: sshbuf_new failed", __func__); 915 sockets[i].type = type; 916 return; 917 } 918 old_alloc = sockets_alloc; 919 new_alloc = sockets_alloc + 10; 920 sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); 921 for (i = old_alloc; i < new_alloc; i++) 922 sockets[i].type = AUTH_UNUSED; 923 sockets_alloc = new_alloc; 924 sockets[old_alloc].fd = fd; 925 if ((sockets[old_alloc].input = sshbuf_new()) == NULL) 926 fatal("%s: sshbuf_new failed", __func__); 927 if ((sockets[old_alloc].output = sshbuf_new()) == NULL) 928 fatal("%s: sshbuf_new failed", __func__); 929 if ((sockets[old_alloc].request = sshbuf_new()) == NULL) 930 fatal("%s: sshbuf_new failed", __func__); 931 sockets[old_alloc].type = type; 932 } 933 934 static int 935 prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp, 936 struct timeval **tvpp) 937 { 938 u_int i, sz; 939 int n = 0; 940 static struct timeval tv; 941 time_t deadline; 942 943 for (i = 0; i < sockets_alloc; i++) { 944 switch (sockets[i].type) { 945 case AUTH_SOCKET: 946 case AUTH_CONNECTION: 947 n = MAX(n, sockets[i].fd); 948 break; 949 case AUTH_UNUSED: 950 break; 951 default: 952 fatal("Unknown socket type %d", sockets[i].type); 953 break; 954 } 955 } 956 957 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); 958 if (*fdrp == NULL || sz > *nallocp) { 959 free(*fdrp); 960 free(*fdwp); 961 *fdrp = xmalloc(sz); 962 *fdwp = xmalloc(sz); 963 *nallocp = sz; 964 } 965 if (n < *fdl) 966 debug("XXX shrink: %d < %d", n, *fdl); 967 *fdl = n; 968 memset(*fdrp, 0, sz); 969 memset(*fdwp, 0, sz); 970 971 for (i = 0; i < sockets_alloc; i++) { 972 switch (sockets[i].type) { 973 case AUTH_SOCKET: 974 case AUTH_CONNECTION: 975 FD_SET(sockets[i].fd, *fdrp); 976 if (sshbuf_len(sockets[i].output) > 0) 977 FD_SET(sockets[i].fd, *fdwp); 978 break; 979 default: 980 break; 981 } 982 } 983 deadline = reaper(); 984 if (parent_alive_interval != 0) 985 deadline = (deadline == 0) ? parent_alive_interval : 986 MIN(deadline, parent_alive_interval); 987 if (deadline == 0) { 988 *tvpp = NULL; 989 } else { 990 tv.tv_sec = deadline; 991 tv.tv_usec = 0; 992 *tvpp = &tv; 993 } 994 return (1); 995 } 996 997 static void 998 after_select(fd_set *readset, fd_set *writeset) 999 { 1000 struct sockaddr_un sunaddr; 1001 socklen_t slen; 1002 char buf[1024]; 1003 int len, sock, r; 1004 u_int i, orig_alloc; 1005 uid_t euid; 1006 gid_t egid; 1007 1008 for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++) 1009 switch (sockets[i].type) { 1010 case AUTH_UNUSED: 1011 break; 1012 case AUTH_SOCKET: 1013 if (FD_ISSET(sockets[i].fd, readset)) { 1014 slen = sizeof(sunaddr); 1015 sock = accept(sockets[i].fd, 1016 (struct sockaddr *)&sunaddr, &slen); 1017 if (sock < 0) { 1018 error("accept from AUTH_SOCKET: %s", 1019 strerror(errno)); 1020 break; 1021 } 1022 if (getpeereid(sock, &euid, &egid) < 0) { 1023 error("getpeereid %d failed: %s", 1024 sock, strerror(errno)); 1025 close(sock); 1026 break; 1027 } 1028 if ((euid != 0) && (getuid() != euid)) { 1029 error("uid mismatch: " 1030 "peer euid %u != uid %u", 1031 (u_int) euid, (u_int) getuid()); 1032 close(sock); 1033 break; 1034 } 1035 new_socket(AUTH_CONNECTION, sock); 1036 } 1037 break; 1038 case AUTH_CONNECTION: 1039 if (sshbuf_len(sockets[i].output) > 0 && 1040 FD_ISSET(sockets[i].fd, writeset)) { 1041 len = write(sockets[i].fd, 1042 sshbuf_ptr(sockets[i].output), 1043 sshbuf_len(sockets[i].output)); 1044 if (len == -1 && (errno == EAGAIN || 1045 errno == EINTR)) 1046 continue; 1047 if (len <= 0) { 1048 close_socket(&sockets[i]); 1049 break; 1050 } 1051 if ((r = sshbuf_consume(sockets[i].output, 1052 len)) != 0) 1053 fatal("%s: buffer error: %s", 1054 __func__, ssh_err(r)); 1055 } 1056 if (FD_ISSET(sockets[i].fd, readset)) { 1057 len = read(sockets[i].fd, buf, sizeof(buf)); 1058 if (len == -1 && (errno == EAGAIN || 1059 errno == EINTR)) 1060 continue; 1061 if (len <= 0) { 1062 close_socket(&sockets[i]); 1063 break; 1064 } 1065 if ((r = sshbuf_put(sockets[i].input, 1066 buf, len)) != 0) 1067 fatal("%s: buffer error: %s", 1068 __func__, ssh_err(r)); 1069 explicit_bzero(buf, sizeof(buf)); 1070 process_message(&sockets[i]); 1071 } 1072 break; 1073 default: 1074 fatal("Unknown type %d", sockets[i].type); 1075 } 1076 } 1077 1078 static void 1079 cleanup_socket(void) 1080 { 1081 if (cleanup_pid != 0 && getpid() != cleanup_pid) 1082 return; 1083 debug("%s: cleanup", __func__); 1084 if (socket_name[0]) 1085 unlink(socket_name); 1086 if (socket_dir[0]) 1087 rmdir(socket_dir); 1088 } 1089 1090 void 1091 cleanup_exit(int i) 1092 { 1093 cleanup_socket(); 1094 _exit(i); 1095 } 1096 1097 /*ARGSUSED*/ 1098 __dead static void 1099 cleanup_handler(int sig) 1100 { 1101 cleanup_socket(); 1102 #ifdef ENABLE_PKCS11 1103 pkcs11_terminate(); 1104 #endif 1105 _exit(2); 1106 } 1107 1108 static void 1109 check_parent_exists(void) 1110 { 1111 /* 1112 * If our parent has exited then getppid() will return (pid_t)1, 1113 * so testing for that should be safe. 1114 */ 1115 if (parent_pid != -1 && getppid() != parent_pid) { 1116 /* printf("Parent has died - Authentication agent exiting.\n"); */ 1117 cleanup_socket(); 1118 _exit(2); 1119 } 1120 } 1121 1122 __dead static void 1123 usage(void) 1124 { 1125 fprintf(stderr, 1126 "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-E fingerprint_hash]\n" 1127 " [-t life] [command [arg ...]]\n" 1128 " ssh-agent [-c | -s] -k\n"); 1129 exit(1); 1130 } 1131 1132 static void 1133 csh_setenv(const char *name, const char *value) 1134 { 1135 printf("setenv %s %s;\n", name, value); 1136 } 1137 1138 static void 1139 csh_unsetenv(const char *name) 1140 { 1141 printf("unsetenv %s;\n", name); 1142 } 1143 1144 static void 1145 sh_setenv(const char *name, const char *value) 1146 { 1147 printf("%s=%s; export %s;\n", name, value, name); 1148 } 1149 1150 static void 1151 sh_unsetenv(const char *name) 1152 { 1153 printf("unset %s;\n", name); 1154 } 1155 int 1156 main(int ac, char **av) 1157 { 1158 int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; 1159 int sock, fd, ch, result, saved_errno; 1160 u_int nalloc; 1161 char *shell, *pidstr, *agentsocket = NULL; 1162 fd_set *readsetp = NULL, *writesetp = NULL; 1163 struct rlimit rlim; 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 mode_t prev_mask; 1171 void (*f_setenv)(const char *, const char *); 1172 void (*f_unsetenv)(const char *); 1173 1174 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1175 sanitise_stdfd(); 1176 1177 /* drop */ 1178 setegid(getgid()); 1179 setgid(getgid()); 1180 1181 #ifdef WITH_OPENSSL 1182 OpenSSL_add_all_algorithms(); 1183 #endif 1184 1185 while ((ch = getopt(ac, av, "cdksE:a:t:")) != -1) { 1186 switch (ch) { 1187 case 'E': 1188 fingerprint_hash = ssh_digest_alg_by_name(optarg); 1189 if (fingerprint_hash == -1) 1190 fatal("Invalid hash algorithm \"%s\"", optarg); 1191 break; 1192 case 'c': 1193 if (s_flag) 1194 usage(); 1195 c_flag++; 1196 break; 1197 case 'k': 1198 k_flag++; 1199 break; 1200 case 's': 1201 if (c_flag) 1202 usage(); 1203 s_flag++; 1204 break; 1205 case 'd': 1206 if (d_flag) 1207 usage(); 1208 d_flag++; 1209 break; 1210 case 'a': 1211 agentsocket = optarg; 1212 break; 1213 case 't': 1214 if ((lifetime = convtime(optarg)) == -1) { 1215 fprintf(stderr, "Invalid lifetime\n"); 1216 usage(); 1217 } 1218 break; 1219 default: 1220 usage(); 1221 } 1222 } 1223 ac -= optind; 1224 av += optind; 1225 1226 if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) 1227 usage(); 1228 1229 if (ac == 0 && !c_flag && !s_flag) { 1230 shell = getenv("SHELL"); 1231 if (shell != NULL && (len = strlen(shell)) > 2 && 1232 strncmp(shell + len - 3, "csh", 3) == 0) 1233 c_flag = 1; 1234 } 1235 if (c_flag) { 1236 f_setenv = csh_setenv; 1237 f_unsetenv = csh_unsetenv; 1238 } else { 1239 f_setenv = sh_setenv; 1240 f_unsetenv = sh_unsetenv; 1241 } 1242 if (k_flag) { 1243 const char *errstr = NULL; 1244 1245 pidstr = getenv(SSH_AGENTPID_ENV_NAME); 1246 if (pidstr == NULL) { 1247 fprintf(stderr, "%s not set, cannot kill agent\n", 1248 SSH_AGENTPID_ENV_NAME); 1249 exit(1); 1250 } 1251 pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); 1252 if (errstr) { 1253 fprintf(stderr, 1254 "%s=\"%s\", which is not a good PID: %s\n", 1255 SSH_AGENTPID_ENV_NAME, pidstr, errstr); 1256 exit(1); 1257 } 1258 if (kill(pid, SIGTERM) == -1) { 1259 perror("kill"); 1260 exit(1); 1261 } 1262 (*f_unsetenv)(SSH_AUTHSOCKET_ENV_NAME); 1263 (*f_unsetenv)(SSH_AGENTPID_ENV_NAME); 1264 printf("echo Agent pid %ld killed;\n", (long)pid); 1265 exit(0); 1266 } 1267 parent_pid = getpid(); 1268 1269 if (agentsocket == NULL) { 1270 /* Create private directory for agent socket */ 1271 mktemp_proto(socket_dir, sizeof(socket_dir)); 1272 if (mkdtemp(socket_dir) == NULL) { 1273 perror("mkdtemp: private socket dir"); 1274 exit(1); 1275 } 1276 snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, 1277 (long)parent_pid); 1278 } else { 1279 /* Try to use specified agent socket */ 1280 socket_dir[0] = '\0'; 1281 strlcpy(socket_name, agentsocket, sizeof socket_name); 1282 } 1283 1284 /* 1285 * Create socket early so it will exist before command gets run from 1286 * the parent. 1287 */ 1288 prev_mask = umask(0177); 1289 sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0); 1290 if (sock < 0) { 1291 /* XXX - unix_listener() calls error() not perror() */ 1292 *socket_name = '\0'; /* Don't unlink any existing file */ 1293 cleanup_exit(1); 1294 } 1295 umask(prev_mask); 1296 1297 /* 1298 * Fork, and have the parent execute the command, if any, or present 1299 * the socket data. The child continues as the authentication agent. 1300 */ 1301 if (d_flag) { 1302 log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); 1303 (*f_setenv)(SSH_AUTHSOCKET_ENV_NAME, socket_name); 1304 printf("echo Agent pid %ld;\n", (long)parent_pid); 1305 goto skip; 1306 } 1307 pid = fork(); 1308 if (pid == -1) { 1309 perror("fork"); 1310 cleanup_exit(1); 1311 } 1312 if (pid != 0) { /* Parent - execute the given command. */ 1313 close(sock); 1314 snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); 1315 if (ac == 0) { 1316 (*f_setenv)(SSH_AUTHSOCKET_ENV_NAME, socket_name); 1317 (*f_setenv)(SSH_AGENTPID_ENV_NAME, pidstrbuf); 1318 printf("echo Agent pid %ld;\n", (long)pid); 1319 exit(0); 1320 } 1321 if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || 1322 setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { 1323 perror("setenv"); 1324 exit(1); 1325 } 1326 execvp(av[0], av); 1327 perror(av[0]); 1328 exit(1); 1329 } 1330 /* child */ 1331 log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); 1332 1333 if (setsid() == -1) { 1334 error("setsid: %s", strerror(errno)); 1335 cleanup_exit(1); 1336 } 1337 1338 (void)chdir("/"); 1339 1340 if (sock != STDERR_FILENO + 1) { 1341 if (dup2(sock, STDERR_FILENO + 1) == -1) { 1342 error("dup2: %s", strerror(errno)); 1343 cleanup_exit(1); 1344 } 1345 close(sock); 1346 sock = STDERR_FILENO + 1; 1347 } 1348 #if defined(F_CLOSEM) 1349 if (fcntl(sock + 1, F_CLOSEM, 0) == -1) { 1350 error("fcntl F_CLOSEM: %s", strerror(errno)); 1351 cleanup_exit(1); 1352 } 1353 #else 1354 { 1355 int nfiles; 1356 #if defined(_SC_OPEN_MAX) 1357 nfiles = sysconf(_SC_OPEN_MAX); 1358 #elif defined(RLIMIT_NOFILE) 1359 if (getrlimit(RLIMIT_CORE, &rlim) < 0) { 1360 error("getrlimit RLIMIT_NOFILE: %s", strerror(errno)); 1361 cleanup_exit(1); 1362 } 1363 nfiles = rlim.rlim_cur; 1364 #elif defined(OPEN_MAX) 1365 nfiles = OPEN_MAX; 1366 #elif defined(NOFILE) 1367 nfiles = NOFILE; 1368 #else 1369 nfiles = 1024; 1370 #endif 1371 for (fd = sock + 1; fd < nfiles; fd++) 1372 close(fd); 1373 } 1374 #endif 1375 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1376 if (dup2(fd, STDIN_FILENO) == -1 || 1377 dup2(fd, STDOUT_FILENO) == -1 || 1378 dup2(fd, STDERR_FILENO) == -1) { 1379 error("dup2: %s", strerror(errno)); 1380 cleanup_exit(1); 1381 } 1382 if (fd > STDERR_FILENO) 1383 close(fd); 1384 } 1385 1386 /* deny core dumps, since memory contains unencrypted private keys */ 1387 rlim.rlim_cur = rlim.rlim_max = 0; 1388 if (setrlimit(RLIMIT_CORE, &rlim) < 0) { 1389 error("setrlimit RLIMIT_CORE: %s", strerror(errno)); 1390 cleanup_exit(1); 1391 } 1392 1393 skip: 1394 1395 cleanup_pid = getpid(); 1396 1397 #ifdef ENABLE_PKCS11 1398 pkcs11_init(0); 1399 #endif 1400 new_socket(AUTH_SOCKET, sock); 1401 if (ac > 0) 1402 parent_alive_interval = 10; 1403 idtab_init(); 1404 signal(SIGPIPE, SIG_IGN); 1405 signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN); 1406 signal(SIGHUP, cleanup_handler); 1407 signal(SIGTERM, cleanup_handler); 1408 nalloc = 0; 1409 1410 while (1) { 1411 prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp); 1412 result = select(max_fd + 1, readsetp, writesetp, NULL, tvp); 1413 saved_errno = errno; 1414 if (parent_alive_interval != 0) 1415 check_parent_exists(); 1416 (void) reaper(); /* remove expired keys */ 1417 if (result < 0) { 1418 if (saved_errno == EINTR) 1419 continue; 1420 fatal("select: %s", strerror(saved_errno)); 1421 } else if (result > 0) 1422 after_select(readsetp, writesetp); 1423 } 1424 /* NOTREACHED */ 1425 } 1426