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 39 #include <sys/types.h> 40 #include <sys/param.h> 41 #include <sys/resource.h> 42 #include <sys/stat.h> 43 #include <sys/socket.h> 44 #ifdef HAVE_SYS_TIME_H 45 # include <sys/time.h> 46 #endif 47 #ifdef HAVE_SYS_UN_H 48 # include <sys/un.h> 49 #endif 50 #include "openbsd-compat/sys-queue.h" 51 52 #include <openssl/evp.h> 53 #include <openssl/md5.h> 54 #include "openbsd-compat/openssl-compat.h" 55 56 #include <errno.h> 57 #include <fcntl.h> 58 #ifdef HAVE_PATHS_H 59 # include <paths.h> 60 #endif 61 #include <signal.h> 62 #include <stdarg.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <time.h> 66 #include <string.h> 67 #include <unistd.h> 68 69 #include "xmalloc.h" 70 #include "ssh.h" 71 #include "rsa.h" 72 #include "buffer.h" 73 #include "key.h" 74 #include "authfd.h" 75 #include "compat.h" 76 #include "log.h" 77 #include "misc.h" 78 79 #ifdef ENABLE_PKCS11 80 #include "ssh-pkcs11.h" 81 #endif 82 83 #if defined(HAVE_SYS_PRCTL_H) 84 #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ 85 #endif 86 87 typedef enum { 88 AUTH_UNUSED, 89 AUTH_SOCKET, 90 AUTH_CONNECTION 91 } sock_type; 92 93 typedef struct { 94 int fd; 95 sock_type type; 96 Buffer input; 97 Buffer output; 98 Buffer request; 99 } SocketEntry; 100 101 u_int sockets_alloc = 0; 102 SocketEntry *sockets = NULL; 103 104 typedef struct identity { 105 TAILQ_ENTRY(identity) next; 106 Key *key; 107 char *comment; 108 char *provider; 109 u_int death; 110 u_int confirm; 111 } Identity; 112 113 typedef struct { 114 int nentries; 115 TAILQ_HEAD(idqueue, identity) idlist; 116 } Idtab; 117 118 /* private key table, one per protocol version */ 119 Idtab idtable[3]; 120 121 int max_fd = 0; 122 123 /* pid of shell == parent of agent */ 124 pid_t parent_pid = -1; 125 u_int parent_alive_interval = 0; 126 127 /* pathname and directory for AUTH_SOCKET */ 128 char socket_name[MAXPATHLEN]; 129 char socket_dir[MAXPATHLEN]; 130 131 /* locking */ 132 int locked = 0; 133 char *lock_passwd = NULL; 134 135 extern char *__progname; 136 137 /* Default lifetime (0 == forever) */ 138 static int lifetime = 0; 139 140 static void 141 close_socket(SocketEntry *e) 142 { 143 close(e->fd); 144 e->fd = -1; 145 e->type = AUTH_UNUSED; 146 buffer_free(&e->input); 147 buffer_free(&e->output); 148 buffer_free(&e->request); 149 } 150 151 static void 152 idtab_init(void) 153 { 154 int i; 155 156 for (i = 0; i <=2; i++) { 157 TAILQ_INIT(&idtable[i].idlist); 158 idtable[i].nentries = 0; 159 } 160 } 161 162 /* return private key table for requested protocol version */ 163 static Idtab * 164 idtab_lookup(int version) 165 { 166 if (version < 1 || version > 2) 167 fatal("internal error, bad protocol version %d", version); 168 return &idtable[version]; 169 } 170 171 static void 172 free_identity(Identity *id) 173 { 174 key_free(id->key); 175 if (id->provider != NULL) 176 xfree(id->provider); 177 xfree(id->comment); 178 xfree(id); 179 } 180 181 /* return matching private key for given public key */ 182 static Identity * 183 lookup_identity(Key *key, int version) 184 { 185 Identity *id; 186 187 Idtab *tab = idtab_lookup(version); 188 TAILQ_FOREACH(id, &tab->idlist, next) { 189 if (key_equal(key, id->key)) 190 return (id); 191 } 192 return (NULL); 193 } 194 195 /* Check confirmation of keysign request */ 196 static int 197 confirm_key(Identity *id) 198 { 199 char *p; 200 int ret = -1; 201 202 p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX); 203 if (ask_permission("Allow use of key %s?\nKey fingerprint %s.", 204 id->comment, p)) 205 ret = 0; 206 xfree(p); 207 208 return (ret); 209 } 210 211 /* send list of supported public keys to 'client' */ 212 static void 213 process_request_identities(SocketEntry *e, int version) 214 { 215 Idtab *tab = idtab_lookup(version); 216 Identity *id; 217 Buffer msg; 218 219 buffer_init(&msg); 220 buffer_put_char(&msg, (version == 1) ? 221 SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); 222 buffer_put_int(&msg, tab->nentries); 223 TAILQ_FOREACH(id, &tab->idlist, next) { 224 if (id->key->type == KEY_RSA1) { 225 buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); 226 buffer_put_bignum(&msg, id->key->rsa->e); 227 buffer_put_bignum(&msg, id->key->rsa->n); 228 } else { 229 u_char *blob; 230 u_int blen; 231 key_to_blob(id->key, &blob, &blen); 232 buffer_put_string(&msg, blob, blen); 233 xfree(blob); 234 } 235 buffer_put_cstring(&msg, id->comment); 236 } 237 buffer_put_int(&e->output, buffer_len(&msg)); 238 buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); 239 buffer_free(&msg); 240 } 241 242 /* ssh1 only */ 243 static void 244 process_authentication_challenge1(SocketEntry *e) 245 { 246 u_char buf[32], mdbuf[16], session_id[16]; 247 u_int response_type; 248 BIGNUM *challenge; 249 Identity *id; 250 int i, len; 251 Buffer msg; 252 MD5_CTX md; 253 Key *key; 254 255 buffer_init(&msg); 256 key = key_new(KEY_RSA1); 257 if ((challenge = BN_new()) == NULL) 258 fatal("process_authentication_challenge1: BN_new failed"); 259 260 (void) buffer_get_int(&e->request); /* ignored */ 261 buffer_get_bignum(&e->request, key->rsa->e); 262 buffer_get_bignum(&e->request, key->rsa->n); 263 buffer_get_bignum(&e->request, challenge); 264 265 /* Only protocol 1.1 is supported */ 266 if (buffer_len(&e->request) == 0) 267 goto failure; 268 buffer_get(&e->request, session_id, 16); 269 response_type = buffer_get_int(&e->request); 270 if (response_type != 1) 271 goto failure; 272 273 id = lookup_identity(key, 1); 274 if (id != NULL && (!id->confirm || confirm_key(id) == 0)) { 275 Key *private = id->key; 276 /* Decrypt the challenge using the private key. */ 277 if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) 278 goto failure; 279 280 /* The response is MD5 of decrypted challenge plus session id. */ 281 len = BN_num_bytes(challenge); 282 if (len <= 0 || len > 32) { 283 logit("process_authentication_challenge: bad challenge length %d", len); 284 goto failure; 285 } 286 memset(buf, 0, 32); 287 BN_bn2bin(challenge, buf + 32 - len); 288 MD5_Init(&md); 289 MD5_Update(&md, buf, 32); 290 MD5_Update(&md, session_id, 16); 291 MD5_Final(mdbuf, &md); 292 293 /* Send the response. */ 294 buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); 295 for (i = 0; i < 16; i++) 296 buffer_put_char(&msg, mdbuf[i]); 297 goto send; 298 } 299 300 failure: 301 /* Unknown identity or protocol error. Send failure. */ 302 buffer_put_char(&msg, SSH_AGENT_FAILURE); 303 send: 304 buffer_put_int(&e->output, buffer_len(&msg)); 305 buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); 306 key_free(key); 307 BN_clear_free(challenge); 308 buffer_free(&msg); 309 } 310 311 /* ssh2 only */ 312 static void 313 process_sign_request2(SocketEntry *e) 314 { 315 u_char *blob, *data, *signature = NULL; 316 u_int blen, dlen, slen = 0; 317 extern int datafellows; 318 int odatafellows; 319 int ok = -1, flags; 320 Buffer msg; 321 Key *key; 322 323 datafellows = 0; 324 325 blob = buffer_get_string(&e->request, &blen); 326 data = buffer_get_string(&e->request, &dlen); 327 328 flags = buffer_get_int(&e->request); 329 odatafellows = datafellows; 330 if (flags & SSH_AGENT_OLD_SIGNATURE) 331 datafellows = SSH_BUG_SIGBLOB; 332 333 key = key_from_blob(blob, blen); 334 if (key != NULL) { 335 Identity *id = lookup_identity(key, 2); 336 if (id != NULL && (!id->confirm || confirm_key(id) == 0)) 337 ok = key_sign(id->key, &signature, &slen, data, dlen); 338 key_free(key); 339 } 340 buffer_init(&msg); 341 if (ok == 0) { 342 buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); 343 buffer_put_string(&msg, signature, slen); 344 } else { 345 buffer_put_char(&msg, SSH_AGENT_FAILURE); 346 } 347 buffer_put_int(&e->output, buffer_len(&msg)); 348 buffer_append(&e->output, buffer_ptr(&msg), 349 buffer_len(&msg)); 350 buffer_free(&msg); 351 xfree(data); 352 xfree(blob); 353 if (signature != NULL) 354 xfree(signature); 355 datafellows = odatafellows; 356 } 357 358 /* shared */ 359 static void 360 process_remove_identity(SocketEntry *e, int version) 361 { 362 u_int blen, bits; 363 int success = 0; 364 Key *key = NULL; 365 u_char *blob; 366 367 switch (version) { 368 case 1: 369 key = key_new(KEY_RSA1); 370 bits = buffer_get_int(&e->request); 371 buffer_get_bignum(&e->request, key->rsa->e); 372 buffer_get_bignum(&e->request, key->rsa->n); 373 374 if (bits != key_size(key)) 375 logit("Warning: identity keysize mismatch: actual %u, announced %u", 376 key_size(key), bits); 377 break; 378 case 2: 379 blob = buffer_get_string(&e->request, &blen); 380 key = key_from_blob(blob, blen); 381 xfree(blob); 382 break; 383 } 384 if (key != NULL) { 385 Identity *id = lookup_identity(key, version); 386 if (id != NULL) { 387 /* 388 * We have this key. Free the old key. Since we 389 * don't want to leave empty slots in the middle of 390 * the array, we actually free the key there and move 391 * all the entries between the empty slot and the end 392 * of the array. 393 */ 394 Idtab *tab = idtab_lookup(version); 395 if (tab->nentries < 1) 396 fatal("process_remove_identity: " 397 "internal error: tab->nentries %d", 398 tab->nentries); 399 TAILQ_REMOVE(&tab->idlist, id, next); 400 free_identity(id); 401 tab->nentries--; 402 success = 1; 403 } 404 key_free(key); 405 } 406 buffer_put_int(&e->output, 1); 407 buffer_put_char(&e->output, 408 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 409 } 410 411 static void 412 process_remove_all_identities(SocketEntry *e, int version) 413 { 414 Idtab *tab = idtab_lookup(version); 415 Identity *id; 416 417 /* Loop over all identities and clear the keys. */ 418 for (id = TAILQ_FIRST(&tab->idlist); id; 419 id = TAILQ_FIRST(&tab->idlist)) { 420 TAILQ_REMOVE(&tab->idlist, id, next); 421 free_identity(id); 422 } 423 424 /* Mark that there are no identities. */ 425 tab->nentries = 0; 426 427 /* Send success. */ 428 buffer_put_int(&e->output, 1); 429 buffer_put_char(&e->output, SSH_AGENT_SUCCESS); 430 } 431 432 /* removes expired keys and returns number of seconds until the next expiry */ 433 static u_int 434 reaper(void) 435 { 436 u_int deadline = 0, now = time(NULL); 437 Identity *id, *nxt; 438 int version; 439 Idtab *tab; 440 441 for (version = 1; version < 3; version++) { 442 tab = idtab_lookup(version); 443 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { 444 nxt = TAILQ_NEXT(id, next); 445 if (id->death == 0) 446 continue; 447 if (now >= id->death) { 448 debug("expiring key '%s'", id->comment); 449 TAILQ_REMOVE(&tab->idlist, id, next); 450 free_identity(id); 451 tab->nentries--; 452 } else 453 deadline = (deadline == 0) ? id->death : 454 MIN(deadline, id->death); 455 } 456 } 457 if (deadline == 0 || deadline <= now) 458 return 0; 459 else 460 return (deadline - now); 461 } 462 463 static void 464 process_add_identity(SocketEntry *e, int version) 465 { 466 Idtab *tab = idtab_lookup(version); 467 Identity *id; 468 int type, success = 0, death = 0, confirm = 0; 469 char *type_name, *comment; 470 Key *k = NULL; 471 #ifdef OPENSSL_HAS_ECC 472 BIGNUM *exponent; 473 EC_POINT *q; 474 char *curve; 475 #endif 476 u_char *cert; 477 u_int len; 478 479 switch (version) { 480 case 1: 481 k = key_new_private(KEY_RSA1); 482 (void) buffer_get_int(&e->request); /* ignored */ 483 buffer_get_bignum(&e->request, k->rsa->n); 484 buffer_get_bignum(&e->request, k->rsa->e); 485 buffer_get_bignum(&e->request, k->rsa->d); 486 buffer_get_bignum(&e->request, k->rsa->iqmp); 487 488 /* SSH and SSL have p and q swapped */ 489 buffer_get_bignum(&e->request, k->rsa->q); /* p */ 490 buffer_get_bignum(&e->request, k->rsa->p); /* q */ 491 492 /* Generate additional parameters */ 493 rsa_generate_additional_parameters(k->rsa); 494 break; 495 case 2: 496 type_name = buffer_get_string(&e->request, NULL); 497 type = key_type_from_name(type_name); 498 switch (type) { 499 case KEY_DSA: 500 k = key_new_private(type); 501 buffer_get_bignum2(&e->request, k->dsa->p); 502 buffer_get_bignum2(&e->request, k->dsa->q); 503 buffer_get_bignum2(&e->request, k->dsa->g); 504 buffer_get_bignum2(&e->request, k->dsa->pub_key); 505 buffer_get_bignum2(&e->request, k->dsa->priv_key); 506 break; 507 case KEY_DSA_CERT_V00: 508 case KEY_DSA_CERT: 509 cert = buffer_get_string(&e->request, &len); 510 if ((k = key_from_blob(cert, len)) == NULL) 511 fatal("Certificate parse failed"); 512 xfree(cert); 513 key_add_private(k); 514 buffer_get_bignum2(&e->request, k->dsa->priv_key); 515 break; 516 #ifdef OPENSSL_HAS_ECC 517 case KEY_ECDSA: 518 k = key_new_private(type); 519 k->ecdsa_nid = key_ecdsa_nid_from_name(type_name); 520 curve = buffer_get_string(&e->request, NULL); 521 if (k->ecdsa_nid != key_curve_name_to_nid(curve)) 522 fatal("%s: curve names mismatch", __func__); 523 xfree(curve); 524 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 525 if (k->ecdsa == NULL) 526 fatal("%s: EC_KEY_new_by_curve_name failed", 527 __func__); 528 q = EC_POINT_new(EC_KEY_get0_group(k->ecdsa)); 529 if (q == NULL) 530 fatal("%s: BN_new failed", __func__); 531 if ((exponent = BN_new()) == NULL) 532 fatal("%s: BN_new failed", __func__); 533 buffer_get_ecpoint(&e->request, 534 EC_KEY_get0_group(k->ecdsa), q); 535 buffer_get_bignum2(&e->request, exponent); 536 if (EC_KEY_set_public_key(k->ecdsa, q) != 1) 537 fatal("%s: EC_KEY_set_public_key failed", 538 __func__); 539 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) 540 fatal("%s: EC_KEY_set_private_key failed", 541 __func__); 542 if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 543 EC_KEY_get0_public_key(k->ecdsa)) != 0) 544 fatal("%s: bad ECDSA public key", __func__); 545 if (key_ec_validate_private(k->ecdsa) != 0) 546 fatal("%s: bad ECDSA private key", __func__); 547 BN_clear_free(exponent); 548 EC_POINT_free(q); 549 break; 550 case KEY_ECDSA_CERT: 551 cert = buffer_get_string(&e->request, &len); 552 if ((k = key_from_blob(cert, len)) == NULL) 553 fatal("Certificate parse failed"); 554 xfree(cert); 555 key_add_private(k); 556 if ((exponent = BN_new()) == NULL) 557 fatal("%s: BN_new failed", __func__); 558 buffer_get_bignum2(&e->request, exponent); 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 key_ec_validate_private(k->ecdsa) != 0) 565 fatal("%s: bad ECDSA key", __func__); 566 BN_clear_free(exponent); 567 break; 568 #endif /* OPENSSL_HAS_ECC */ 569 case KEY_RSA: 570 k = key_new_private(type); 571 buffer_get_bignum2(&e->request, k->rsa->n); 572 buffer_get_bignum2(&e->request, k->rsa->e); 573 buffer_get_bignum2(&e->request, k->rsa->d); 574 buffer_get_bignum2(&e->request, k->rsa->iqmp); 575 buffer_get_bignum2(&e->request, k->rsa->p); 576 buffer_get_bignum2(&e->request, k->rsa->q); 577 578 /* Generate additional parameters */ 579 rsa_generate_additional_parameters(k->rsa); 580 break; 581 case KEY_RSA_CERT_V00: 582 case KEY_RSA_CERT: 583 cert = buffer_get_string(&e->request, &len); 584 if ((k = key_from_blob(cert, len)) == NULL) 585 fatal("Certificate parse failed"); 586 xfree(cert); 587 key_add_private(k); 588 buffer_get_bignum2(&e->request, k->rsa->d); 589 buffer_get_bignum2(&e->request, k->rsa->iqmp); 590 buffer_get_bignum2(&e->request, k->rsa->p); 591 buffer_get_bignum2(&e->request, k->rsa->q); 592 break; 593 default: 594 xfree(type_name); 595 buffer_clear(&e->request); 596 goto send; 597 } 598 xfree(type_name); 599 break; 600 } 601 /* enable blinding */ 602 switch (k->type) { 603 case KEY_RSA: 604 case KEY_RSA_CERT_V00: 605 case KEY_RSA_CERT: 606 case KEY_RSA1: 607 if (RSA_blinding_on(k->rsa, NULL) != 1) { 608 error("process_add_identity: RSA_blinding_on failed"); 609 key_free(k); 610 goto send; 611 } 612 break; 613 } 614 comment = buffer_get_string(&e->request, NULL); 615 if (k == NULL) { 616 xfree(comment); 617 goto send; 618 } 619 while (buffer_len(&e->request)) { 620 switch ((type = buffer_get_char(&e->request))) { 621 case SSH_AGENT_CONSTRAIN_LIFETIME: 622 death = time(NULL) + buffer_get_int(&e->request); 623 break; 624 case SSH_AGENT_CONSTRAIN_CONFIRM: 625 confirm = 1; 626 break; 627 default: 628 error("process_add_identity: " 629 "Unknown constraint type %d", type); 630 xfree(comment); 631 key_free(k); 632 goto send; 633 } 634 } 635 success = 1; 636 if (lifetime && !death) 637 death = time(NULL) + lifetime; 638 if ((id = lookup_identity(k, version)) == NULL) { 639 id = xcalloc(1, sizeof(Identity)); 640 id->key = k; 641 TAILQ_INSERT_TAIL(&tab->idlist, id, next); 642 /* Increment the number of identities. */ 643 tab->nentries++; 644 } else { 645 key_free(k); 646 xfree(id->comment); 647 } 648 id->comment = comment; 649 id->death = death; 650 id->confirm = confirm; 651 send: 652 buffer_put_int(&e->output, 1); 653 buffer_put_char(&e->output, 654 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 655 } 656 657 /* XXX todo: encrypt sensitive data with passphrase */ 658 static void 659 process_lock_agent(SocketEntry *e, int lock) 660 { 661 int success = 0; 662 char *passwd; 663 664 passwd = buffer_get_string(&e->request, NULL); 665 if (locked && !lock && strcmp(passwd, lock_passwd) == 0) { 666 locked = 0; 667 memset(lock_passwd, 0, strlen(lock_passwd)); 668 xfree(lock_passwd); 669 lock_passwd = NULL; 670 success = 1; 671 } else if (!locked && lock) { 672 locked = 1; 673 lock_passwd = xstrdup(passwd); 674 success = 1; 675 } 676 memset(passwd, 0, strlen(passwd)); 677 xfree(passwd); 678 679 buffer_put_int(&e->output, 1); 680 buffer_put_char(&e->output, 681 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 682 } 683 684 static void 685 no_identities(SocketEntry *e, u_int type) 686 { 687 Buffer msg; 688 689 buffer_init(&msg); 690 buffer_put_char(&msg, 691 (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ? 692 SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); 693 buffer_put_int(&msg, 0); 694 buffer_put_int(&e->output, buffer_len(&msg)); 695 buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); 696 buffer_free(&msg); 697 } 698 699 #ifdef ENABLE_PKCS11 700 static void 701 process_add_smartcard_key(SocketEntry *e) 702 { 703 char *provider = NULL, *pin; 704 int i, type, version, count = 0, success = 0, death = 0, confirm = 0; 705 Key **keys = NULL, *k; 706 Identity *id; 707 Idtab *tab; 708 709 provider = buffer_get_string(&e->request, NULL); 710 pin = buffer_get_string(&e->request, NULL); 711 712 while (buffer_len(&e->request)) { 713 switch ((type = buffer_get_char(&e->request))) { 714 case SSH_AGENT_CONSTRAIN_LIFETIME: 715 death = time(NULL) + buffer_get_int(&e->request); 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 = time(NULL) + 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 key_free(k); 746 } 747 keys[i] = NULL; 748 } 749 send: 750 if (pin) 751 xfree(pin); 752 if (provider) 753 xfree(provider); 754 if (keys) 755 xfree(keys); 756 buffer_put_int(&e->output, 1); 757 buffer_put_char(&e->output, 758 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 759 } 760 761 static void 762 process_remove_smartcard_key(SocketEntry *e) 763 { 764 char *provider = NULL, *pin = NULL; 765 int version, success = 0; 766 Identity *id, *nxt; 767 Idtab *tab; 768 769 provider = buffer_get_string(&e->request, NULL); 770 pin = buffer_get_string(&e->request, NULL); 771 xfree(pin); 772 773 for (version = 1; version < 3; version++) { 774 tab = idtab_lookup(version); 775 for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) { 776 nxt = TAILQ_NEXT(id, next); 777 if (!strcmp(provider, id->provider)) { 778 TAILQ_REMOVE(&tab->idlist, id, next); 779 free_identity(id); 780 tab->nentries--; 781 } 782 } 783 } 784 if (pkcs11_del_provider(provider) == 0) 785 success = 1; 786 else 787 error("process_remove_smartcard_key:" 788 " pkcs11_del_provider failed"); 789 xfree(provider); 790 buffer_put_int(&e->output, 1); 791 buffer_put_char(&e->output, 792 success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); 793 } 794 #endif /* ENABLE_PKCS11 */ 795 796 /* dispatch incoming messages */ 797 798 static void 799 process_message(SocketEntry *e) 800 { 801 u_int msg_len, type; 802 u_char *cp; 803 804 if (buffer_len(&e->input) < 5) 805 return; /* Incomplete message. */ 806 cp = buffer_ptr(&e->input); 807 msg_len = get_u32(cp); 808 if (msg_len > 256 * 1024) { 809 close_socket(e); 810 return; 811 } 812 if (buffer_len(&e->input) < msg_len + 4) 813 return; 814 815 /* move the current input to e->request */ 816 buffer_consume(&e->input, 4); 817 buffer_clear(&e->request); 818 buffer_append(&e->request, buffer_ptr(&e->input), msg_len); 819 buffer_consume(&e->input, msg_len); 820 type = buffer_get_char(&e->request); 821 822 /* check wheter agent is locked */ 823 if (locked && type != SSH_AGENTC_UNLOCK) { 824 buffer_clear(&e->request); 825 switch (type) { 826 case SSH_AGENTC_REQUEST_RSA_IDENTITIES: 827 case SSH2_AGENTC_REQUEST_IDENTITIES: 828 /* send empty lists */ 829 no_identities(e, type); 830 break; 831 default: 832 /* send a fail message for all other request types */ 833 buffer_put_int(&e->output, 1); 834 buffer_put_char(&e->output, SSH_AGENT_FAILURE); 835 } 836 return; 837 } 838 839 debug("type %d", type); 840 switch (type) { 841 case SSH_AGENTC_LOCK: 842 case SSH_AGENTC_UNLOCK: 843 process_lock_agent(e, type == SSH_AGENTC_LOCK); 844 break; 845 /* ssh1 */ 846 case SSH_AGENTC_RSA_CHALLENGE: 847 process_authentication_challenge1(e); 848 break; 849 case SSH_AGENTC_REQUEST_RSA_IDENTITIES: 850 process_request_identities(e, 1); 851 break; 852 case SSH_AGENTC_ADD_RSA_IDENTITY: 853 case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED: 854 process_add_identity(e, 1); 855 break; 856 case SSH_AGENTC_REMOVE_RSA_IDENTITY: 857 process_remove_identity(e, 1); 858 break; 859 case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: 860 process_remove_all_identities(e, 1); 861 break; 862 /* ssh2 */ 863 case SSH2_AGENTC_SIGN_REQUEST: 864 process_sign_request2(e); 865 break; 866 case SSH2_AGENTC_REQUEST_IDENTITIES: 867 process_request_identities(e, 2); 868 break; 869 case SSH2_AGENTC_ADD_IDENTITY: 870 case SSH2_AGENTC_ADD_ID_CONSTRAINED: 871 process_add_identity(e, 2); 872 break; 873 case SSH2_AGENTC_REMOVE_IDENTITY: 874 process_remove_identity(e, 2); 875 break; 876 case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: 877 process_remove_all_identities(e, 2); 878 break; 879 #ifdef ENABLE_PKCS11 880 case SSH_AGENTC_ADD_SMARTCARD_KEY: 881 case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED: 882 process_add_smartcard_key(e); 883 break; 884 case SSH_AGENTC_REMOVE_SMARTCARD_KEY: 885 process_remove_smartcard_key(e); 886 break; 887 #endif /* ENABLE_PKCS11 */ 888 default: 889 /* Unknown message. Respond with failure. */ 890 error("Unknown message %d", type); 891 buffer_clear(&e->request); 892 buffer_put_int(&e->output, 1); 893 buffer_put_char(&e->output, SSH_AGENT_FAILURE); 894 break; 895 } 896 } 897 898 static void 899 new_socket(sock_type type, int fd) 900 { 901 u_int i, old_alloc, new_alloc; 902 903 set_nonblock(fd); 904 905 if (fd > max_fd) 906 max_fd = fd; 907 908 for (i = 0; i < sockets_alloc; i++) 909 if (sockets[i].type == AUTH_UNUSED) { 910 sockets[i].fd = fd; 911 buffer_init(&sockets[i].input); 912 buffer_init(&sockets[i].output); 913 buffer_init(&sockets[i].request); 914 sockets[i].type = type; 915 return; 916 } 917 old_alloc = sockets_alloc; 918 new_alloc = sockets_alloc + 10; 919 sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0])); 920 for (i = old_alloc; i < new_alloc; i++) 921 sockets[i].type = AUTH_UNUSED; 922 sockets_alloc = new_alloc; 923 sockets[old_alloc].fd = fd; 924 buffer_init(&sockets[old_alloc].input); 925 buffer_init(&sockets[old_alloc].output); 926 buffer_init(&sockets[old_alloc].request); 927 sockets[old_alloc].type = type; 928 } 929 930 static int 931 prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp, 932 struct timeval **tvpp) 933 { 934 u_int i, sz, deadline; 935 int n = 0; 936 static struct timeval tv; 937 938 for (i = 0; i < sockets_alloc; i++) { 939 switch (sockets[i].type) { 940 case AUTH_SOCKET: 941 case AUTH_CONNECTION: 942 n = MAX(n, sockets[i].fd); 943 break; 944 case AUTH_UNUSED: 945 break; 946 default: 947 fatal("Unknown socket type %d", sockets[i].type); 948 break; 949 } 950 } 951 952 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); 953 if (*fdrp == NULL || sz > *nallocp) { 954 if (*fdrp) 955 xfree(*fdrp); 956 if (*fdwp) 957 xfree(*fdwp); 958 *fdrp = xmalloc(sz); 959 *fdwp = xmalloc(sz); 960 *nallocp = sz; 961 } 962 if (n < *fdl) 963 debug("XXX shrink: %d < %d", n, *fdl); 964 *fdl = n; 965 memset(*fdrp, 0, sz); 966 memset(*fdwp, 0, sz); 967 968 for (i = 0; i < sockets_alloc; i++) { 969 switch (sockets[i].type) { 970 case AUTH_SOCKET: 971 case AUTH_CONNECTION: 972 FD_SET(sockets[i].fd, *fdrp); 973 if (buffer_len(&sockets[i].output) > 0) 974 FD_SET(sockets[i].fd, *fdwp); 975 break; 976 default: 977 break; 978 } 979 } 980 deadline = reaper(); 981 if (parent_alive_interval != 0) 982 deadline = (deadline == 0) ? parent_alive_interval : 983 MIN(deadline, parent_alive_interval); 984 if (deadline == 0) { 985 *tvpp = NULL; 986 } else { 987 tv.tv_sec = deadline; 988 tv.tv_usec = 0; 989 *tvpp = &tv; 990 } 991 return (1); 992 } 993 994 static void 995 after_select(fd_set *readset, fd_set *writeset) 996 { 997 struct sockaddr_un sunaddr; 998 socklen_t slen; 999 char buf[1024]; 1000 int len, sock; 1001 u_int i, orig_alloc; 1002 uid_t euid; 1003 gid_t egid; 1004 1005 for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++) 1006 switch (sockets[i].type) { 1007 case AUTH_UNUSED: 1008 break; 1009 case AUTH_SOCKET: 1010 if (FD_ISSET(sockets[i].fd, readset)) { 1011 slen = sizeof(sunaddr); 1012 sock = accept(sockets[i].fd, 1013 (struct sockaddr *)&sunaddr, &slen); 1014 if (sock < 0) { 1015 error("accept from AUTH_SOCKET: %s", 1016 strerror(errno)); 1017 break; 1018 } 1019 if (getpeereid(sock, &euid, &egid) < 0) { 1020 error("getpeereid %d failed: %s", 1021 sock, strerror(errno)); 1022 close(sock); 1023 break; 1024 } 1025 if ((euid != 0) && (getuid() != euid)) { 1026 error("uid mismatch: " 1027 "peer euid %u != uid %u", 1028 (u_int) euid, (u_int) getuid()); 1029 close(sock); 1030 break; 1031 } 1032 new_socket(AUTH_CONNECTION, sock); 1033 } 1034 break; 1035 case AUTH_CONNECTION: 1036 if (buffer_len(&sockets[i].output) > 0 && 1037 FD_ISSET(sockets[i].fd, writeset)) { 1038 len = write(sockets[i].fd, 1039 buffer_ptr(&sockets[i].output), 1040 buffer_len(&sockets[i].output)); 1041 if (len == -1 && (errno == EAGAIN || 1042 errno == EWOULDBLOCK || 1043 errno == EINTR)) 1044 continue; 1045 if (len <= 0) { 1046 close_socket(&sockets[i]); 1047 break; 1048 } 1049 buffer_consume(&sockets[i].output, len); 1050 } 1051 if (FD_ISSET(sockets[i].fd, readset)) { 1052 len = read(sockets[i].fd, buf, sizeof(buf)); 1053 if (len == -1 && (errno == EAGAIN || 1054 errno == EWOULDBLOCK || 1055 errno == EINTR)) 1056 continue; 1057 if (len <= 0) { 1058 close_socket(&sockets[i]); 1059 break; 1060 } 1061 buffer_append(&sockets[i].input, buf, len); 1062 process_message(&sockets[i]); 1063 } 1064 break; 1065 default: 1066 fatal("Unknown type %d", sockets[i].type); 1067 } 1068 } 1069 1070 static void 1071 cleanup_socket(void) 1072 { 1073 if (socket_name[0]) 1074 unlink(socket_name); 1075 if (socket_dir[0]) 1076 rmdir(socket_dir); 1077 } 1078 1079 void 1080 cleanup_exit(int i) 1081 { 1082 cleanup_socket(); 1083 _exit(i); 1084 } 1085 1086 /*ARGSUSED*/ 1087 static void 1088 cleanup_handler(int sig) 1089 { 1090 cleanup_socket(); 1091 #ifdef ENABLE_PKCS11 1092 pkcs11_terminate(); 1093 #endif 1094 _exit(2); 1095 } 1096 1097 static void 1098 check_parent_exists(void) 1099 { 1100 /* 1101 * If our parent has exited then getppid() will return (pid_t)1, 1102 * so testing for that should be safe. 1103 */ 1104 if (parent_pid != -1 && getppid() != parent_pid) { 1105 /* printf("Parent has died - Authentication agent exiting.\n"); */ 1106 cleanup_socket(); 1107 _exit(2); 1108 } 1109 } 1110 1111 static void 1112 usage(void) 1113 { 1114 fprintf(stderr, "usage: %s [options] [command [arg ...]]\n", 1115 __progname); 1116 fprintf(stderr, "Options:\n"); 1117 fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); 1118 fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); 1119 fprintf(stderr, " -k Kill the current agent.\n"); 1120 fprintf(stderr, " -d Debug mode.\n"); 1121 fprintf(stderr, " -a socket Bind agent socket to given name.\n"); 1122 fprintf(stderr, " -t life Default identity lifetime (seconds).\n"); 1123 exit(1); 1124 } 1125 1126 int 1127 main(int ac, char **av) 1128 { 1129 int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0; 1130 int sock, fd, ch, result, saved_errno; 1131 u_int nalloc; 1132 char *shell, *format, *pidstr, *agentsocket = NULL; 1133 fd_set *readsetp = NULL, *writesetp = NULL; 1134 struct sockaddr_un sunaddr; 1135 #ifdef HAVE_SETRLIMIT 1136 struct rlimit rlim; 1137 #endif 1138 int prev_mask; 1139 extern int optind; 1140 extern char *optarg; 1141 pid_t pid; 1142 char pidstrbuf[1 + 3 * sizeof pid]; 1143 struct timeval *tvp = NULL; 1144 size_t len; 1145 1146 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1147 sanitise_stdfd(); 1148 1149 /* drop */ 1150 setegid(getgid()); 1151 setgid(getgid()); 1152 setuid(geteuid()); 1153 1154 #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) 1155 /* Disable ptrace on Linux without sgid bit */ 1156 prctl(PR_SET_DUMPABLE, 0); 1157 #endif 1158 1159 OpenSSL_add_all_algorithms(); 1160 1161 __progname = ssh_get_progname(av[0]); 1162 seed_rng(); 1163 1164 while ((ch = getopt(ac, av, "cdksa:t:")) != -1) { 1165 switch (ch) { 1166 case 'c': 1167 if (s_flag) 1168 usage(); 1169 c_flag++; 1170 break; 1171 case 'k': 1172 k_flag++; 1173 break; 1174 case 's': 1175 if (c_flag) 1176 usage(); 1177 s_flag++; 1178 break; 1179 case 'd': 1180 if (d_flag) 1181 usage(); 1182 d_flag++; 1183 break; 1184 case 'a': 1185 agentsocket = optarg; 1186 break; 1187 case 't': 1188 if ((lifetime = convtime(optarg)) == -1) { 1189 fprintf(stderr, "Invalid lifetime\n"); 1190 usage(); 1191 } 1192 break; 1193 default: 1194 usage(); 1195 } 1196 } 1197 ac -= optind; 1198 av += optind; 1199 1200 if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) 1201 usage(); 1202 1203 if (ac == 0 && !c_flag && !s_flag) { 1204 shell = getenv("SHELL"); 1205 if (shell != NULL && (len = strlen(shell)) > 2 && 1206 strncmp(shell + len - 3, "csh", 3) == 0) 1207 c_flag = 1; 1208 } 1209 if (k_flag) { 1210 const char *errstr = NULL; 1211 1212 pidstr = getenv(SSH_AGENTPID_ENV_NAME); 1213 if (pidstr == NULL) { 1214 fprintf(stderr, "%s not set, cannot kill agent\n", 1215 SSH_AGENTPID_ENV_NAME); 1216 exit(1); 1217 } 1218 pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr); 1219 if (errstr) { 1220 fprintf(stderr, 1221 "%s=\"%s\", which is not a good PID: %s\n", 1222 SSH_AGENTPID_ENV_NAME, pidstr, errstr); 1223 exit(1); 1224 } 1225 if (kill(pid, SIGTERM) == -1) { 1226 perror("kill"); 1227 exit(1); 1228 } 1229 format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; 1230 printf(format, SSH_AUTHSOCKET_ENV_NAME); 1231 printf(format, SSH_AGENTPID_ENV_NAME); 1232 printf("echo Agent pid %ld killed;\n", (long)pid); 1233 exit(0); 1234 } 1235 parent_pid = getpid(); 1236 1237 if (agentsocket == NULL) { 1238 /* Create private directory for agent socket */ 1239 mktemp_proto(socket_dir, sizeof(socket_dir)); 1240 if (mkdtemp(socket_dir) == NULL) { 1241 perror("mkdtemp: private socket dir"); 1242 exit(1); 1243 } 1244 snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir, 1245 (long)parent_pid); 1246 } else { 1247 /* Try to use specified agent socket */ 1248 socket_dir[0] = '\0'; 1249 strlcpy(socket_name, agentsocket, sizeof socket_name); 1250 } 1251 1252 /* 1253 * Create socket early so it will exist before command gets run from 1254 * the parent. 1255 */ 1256 sock = socket(AF_UNIX, SOCK_STREAM, 0); 1257 if (sock < 0) { 1258 perror("socket"); 1259 *socket_name = '\0'; /* Don't unlink any existing file */ 1260 cleanup_exit(1); 1261 } 1262 memset(&sunaddr, 0, sizeof(sunaddr)); 1263 sunaddr.sun_family = AF_UNIX; 1264 strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); 1265 prev_mask = umask(0177); 1266 if (bind(sock, (struct sockaddr *) &sunaddr, sizeof(sunaddr)) < 0) { 1267 perror("bind"); 1268 *socket_name = '\0'; /* Don't unlink any existing file */ 1269 umask(prev_mask); 1270 cleanup_exit(1); 1271 } 1272 umask(prev_mask); 1273 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { 1274 perror("listen"); 1275 cleanup_exit(1); 1276 } 1277 1278 /* 1279 * Fork, and have the parent execute the command, if any, or present 1280 * the socket data. The child continues as the authentication agent. 1281 */ 1282 if (d_flag) { 1283 log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); 1284 format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; 1285 printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, 1286 SSH_AUTHSOCKET_ENV_NAME); 1287 printf("echo Agent pid %ld;\n", (long)parent_pid); 1288 goto skip; 1289 } 1290 pid = fork(); 1291 if (pid == -1) { 1292 perror("fork"); 1293 cleanup_exit(1); 1294 } 1295 if (pid != 0) { /* Parent - execute the given command. */ 1296 close(sock); 1297 snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid); 1298 if (ac == 0) { 1299 format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; 1300 printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, 1301 SSH_AUTHSOCKET_ENV_NAME); 1302 printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, 1303 SSH_AGENTPID_ENV_NAME); 1304 printf("echo Agent pid %ld;\n", (long)pid); 1305 exit(0); 1306 } 1307 if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || 1308 setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { 1309 perror("setenv"); 1310 exit(1); 1311 } 1312 execvp(av[0], av); 1313 perror(av[0]); 1314 exit(1); 1315 } 1316 /* child */ 1317 log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); 1318 1319 if (setsid() == -1) { 1320 error("setsid: %s", strerror(errno)); 1321 cleanup_exit(1); 1322 } 1323 1324 (void)chdir("/"); 1325 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1326 /* XXX might close listen socket */ 1327 (void)dup2(fd, STDIN_FILENO); 1328 (void)dup2(fd, STDOUT_FILENO); 1329 (void)dup2(fd, STDERR_FILENO); 1330 if (fd > 2) 1331 close(fd); 1332 } 1333 1334 #ifdef HAVE_SETRLIMIT 1335 /* deny core dumps, since memory contains unencrypted private keys */ 1336 rlim.rlim_cur = rlim.rlim_max = 0; 1337 if (setrlimit(RLIMIT_CORE, &rlim) < 0) { 1338 error("setrlimit RLIMIT_CORE: %s", strerror(errno)); 1339 cleanup_exit(1); 1340 } 1341 #endif 1342 1343 skip: 1344 1345 #ifdef ENABLE_PKCS11 1346 pkcs11_init(0); 1347 #endif 1348 new_socket(AUTH_SOCKET, sock); 1349 if (ac > 0) 1350 parent_alive_interval = 10; 1351 idtab_init(); 1352 if (!d_flag) 1353 signal(SIGINT, SIG_IGN); 1354 signal(SIGPIPE, SIG_IGN); 1355 signal(SIGHUP, cleanup_handler); 1356 signal(SIGTERM, cleanup_handler); 1357 nalloc = 0; 1358 1359 while (1) { 1360 prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp); 1361 result = select(max_fd + 1, readsetp, writesetp, NULL, tvp); 1362 saved_errno = errno; 1363 if (parent_alive_interval != 0) 1364 check_parent_exists(); 1365 (void) reaper(); /* remove expired keys */ 1366 if (result < 0) { 1367 if (saved_errno == EINTR) 1368 continue; 1369 fatal("select: %s", strerror(saved_errno)); 1370 } else if (result > 0) 1371 after_select(readsetp, writesetp); 1372 } 1373 /* NOTREACHED */ 1374 } 1375