1 /* 2 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 3 * Copyright 2002 Markus Friedl <markus@openbsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "includes.h" 28 RCSID("$OpenBSD: monitor_wrap.c,v 1.39 2004/07/17 05:31:41 dtucker Exp $"); 29 RCSID("$FreeBSD$"); 30 31 #include <openssl/bn.h> 32 #include <openssl/dh.h> 33 34 #include "ssh.h" 35 #include "dh.h" 36 #include "kex.h" 37 #include "auth.h" 38 #include "auth-options.h" 39 #include "buffer.h" 40 #include "bufaux.h" 41 #include "packet.h" 42 #include "mac.h" 43 #include "log.h" 44 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ 45 #undef TARGET_OS_MAC 46 #include "zlib.h" 47 #define TARGET_OS_MAC 1 48 #else 49 #include "zlib.h" 50 #endif 51 #include "monitor.h" 52 #include "monitor_wrap.h" 53 #include "xmalloc.h" 54 #include "atomicio.h" 55 #include "monitor_fdpass.h" 56 #include "getput.h" 57 #include "servconf.h" 58 59 #include "auth.h" 60 #include "channels.h" 61 #include "session.h" 62 63 #ifdef GSSAPI 64 #include "ssh-gss.h" 65 #endif 66 67 /* Imports */ 68 extern int compat20; 69 extern Newkeys *newkeys[]; 70 extern z_stream incoming_stream; 71 extern z_stream outgoing_stream; 72 extern struct monitor *pmonitor; 73 extern Buffer input, output; 74 extern Buffer loginmsg; 75 extern ServerOptions options; 76 77 int 78 mm_is_monitor(void) 79 { 80 /* 81 * m_pid is only set in the privileged part, and 82 * points to the unprivileged child. 83 */ 84 return (pmonitor && pmonitor->m_pid > 0); 85 } 86 87 void 88 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 89 { 90 u_int mlen = buffer_len(m); 91 u_char buf[5]; 92 93 debug3("%s entering: type %d", __func__, type); 94 95 PUT_32BIT(buf, mlen + 1); 96 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 97 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 98 fatal("%s: write", __func__); 99 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 100 fatal("%s: write", __func__); 101 } 102 103 void 104 mm_request_receive(int sock, Buffer *m) 105 { 106 u_char buf[4]; 107 u_int msg_len; 108 ssize_t res; 109 110 debug3("%s entering", __func__); 111 112 res = atomicio(read, sock, buf, sizeof(buf)); 113 if (res != sizeof(buf)) { 114 if (res == 0) 115 cleanup_exit(255); 116 fatal("%s: read: %ld", __func__, (long)res); 117 } 118 msg_len = GET_32BIT(buf); 119 if (msg_len > 256 * 1024) 120 fatal("%s: read: bad msg_len %d", __func__, msg_len); 121 buffer_clear(m); 122 buffer_append_space(m, msg_len); 123 res = atomicio(read, sock, buffer_ptr(m), msg_len); 124 if (res != msg_len) 125 fatal("%s: read: %ld != msg_len", __func__, (long)res); 126 } 127 128 void 129 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 130 { 131 u_char rtype; 132 133 debug3("%s entering: type %d", __func__, type); 134 135 mm_request_receive(sock, m); 136 rtype = buffer_get_char(m); 137 if (rtype != type) 138 fatal("%s: read: rtype %d != type %d", __func__, 139 rtype, type); 140 } 141 142 DH * 143 mm_choose_dh(int min, int nbits, int max) 144 { 145 BIGNUM *p, *g; 146 int success = 0; 147 Buffer m; 148 149 buffer_init(&m); 150 buffer_put_int(&m, min); 151 buffer_put_int(&m, nbits); 152 buffer_put_int(&m, max); 153 154 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 155 156 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 157 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 158 159 success = buffer_get_char(&m); 160 if (success == 0) 161 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 162 163 if ((p = BN_new()) == NULL) 164 fatal("%s: BN_new failed", __func__); 165 if ((g = BN_new()) == NULL) 166 fatal("%s: BN_new failed", __func__); 167 buffer_get_bignum2(&m, p); 168 buffer_get_bignum2(&m, g); 169 170 debug3("%s: remaining %d", __func__, buffer_len(&m)); 171 buffer_free(&m); 172 173 return (dh_new_group(g, p)); 174 } 175 176 int 177 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 178 { 179 Kex *kex = *pmonitor->m_pkex; 180 Buffer m; 181 182 debug3("%s entering", __func__); 183 184 buffer_init(&m); 185 buffer_put_int(&m, kex->host_key_index(key)); 186 buffer_put_string(&m, data, datalen); 187 188 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 189 190 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 191 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 192 *sigp = buffer_get_string(&m, lenp); 193 buffer_free(&m); 194 195 return (0); 196 } 197 198 struct passwd * 199 mm_getpwnamallow(const char *username) 200 { 201 Buffer m; 202 struct passwd *pw; 203 u_int pwlen; 204 205 debug3("%s entering", __func__); 206 207 buffer_init(&m); 208 buffer_put_cstring(&m, username); 209 210 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 211 212 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 213 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 214 215 if (buffer_get_char(&m) == 0) { 216 buffer_free(&m); 217 return (NULL); 218 } 219 pw = buffer_get_string(&m, &pwlen); 220 if (pwlen != sizeof(struct passwd)) 221 fatal("%s: struct passwd size mismatch", __func__); 222 pw->pw_name = buffer_get_string(&m, NULL); 223 pw->pw_passwd = buffer_get_string(&m, NULL); 224 pw->pw_gecos = buffer_get_string(&m, NULL); 225 #ifdef HAVE_PW_CLASS_IN_PASSWD 226 pw->pw_class = buffer_get_string(&m, NULL); 227 #endif 228 pw->pw_dir = buffer_get_string(&m, NULL); 229 pw->pw_shell = buffer_get_string(&m, NULL); 230 buffer_free(&m); 231 232 return (pw); 233 } 234 235 char * 236 mm_auth2_read_banner(void) 237 { 238 Buffer m; 239 char *banner; 240 241 debug3("%s entering", __func__); 242 243 buffer_init(&m); 244 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 245 buffer_clear(&m); 246 247 mm_request_receive_expect(pmonitor->m_recvfd, 248 MONITOR_ANS_AUTH2_READ_BANNER, &m); 249 banner = buffer_get_string(&m, NULL); 250 buffer_free(&m); 251 252 /* treat empty banner as missing banner */ 253 if (strlen(banner) == 0) { 254 xfree(banner); 255 banner = NULL; 256 } 257 return (banner); 258 } 259 260 /* Inform the privileged process about service and style */ 261 262 void 263 mm_inform_authserv(char *service, char *style) 264 { 265 Buffer m; 266 267 debug3("%s entering", __func__); 268 269 buffer_init(&m); 270 buffer_put_cstring(&m, service); 271 buffer_put_cstring(&m, style ? style : ""); 272 273 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 274 275 buffer_free(&m); 276 } 277 278 /* Do the password authentication */ 279 int 280 mm_auth_password(Authctxt *authctxt, char *password) 281 { 282 Buffer m; 283 int authenticated = 0; 284 285 debug3("%s entering", __func__); 286 287 buffer_init(&m); 288 buffer_put_cstring(&m, password); 289 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 290 291 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 292 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 293 294 authenticated = buffer_get_int(&m); 295 296 buffer_free(&m); 297 298 debug3("%s: user %sauthenticated", 299 __func__, authenticated ? "" : "not "); 300 return (authenticated); 301 } 302 303 int 304 mm_user_key_allowed(struct passwd *pw, Key *key) 305 { 306 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 307 } 308 309 int 310 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 311 Key *key) 312 { 313 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 314 } 315 316 int 317 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 318 char *host, Key *key) 319 { 320 int ret; 321 322 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 323 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 324 key->type = KEY_RSA1; 325 return (ret); 326 } 327 328 static void 329 mm_send_debug(Buffer *m) 330 { 331 char *msg; 332 333 while (buffer_len(m)) { 334 msg = buffer_get_string(m, NULL); 335 debug3("%s: Sending debug: %s", __func__, msg); 336 packet_send_debug("%s", msg); 337 xfree(msg); 338 } 339 } 340 341 int 342 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 343 { 344 Buffer m; 345 u_char *blob; 346 u_int len; 347 int allowed = 0, have_forced = 0; 348 349 debug3("%s entering", __func__); 350 351 /* Convert the key to a blob and the pass it over */ 352 if (!key_to_blob(key, &blob, &len)) 353 return (0); 354 355 buffer_init(&m); 356 buffer_put_int(&m, type); 357 buffer_put_cstring(&m, user ? user : ""); 358 buffer_put_cstring(&m, host ? host : ""); 359 buffer_put_string(&m, blob, len); 360 xfree(blob); 361 362 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 363 364 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 365 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 366 367 allowed = buffer_get_int(&m); 368 369 /* fake forced command */ 370 auth_clear_options(); 371 have_forced = buffer_get_int(&m); 372 forced_command = have_forced ? xstrdup("true") : NULL; 373 374 /* Send potential debug messages */ 375 mm_send_debug(&m); 376 377 buffer_free(&m); 378 379 return (allowed); 380 } 381 382 /* 383 * This key verify needs to send the key type along, because the 384 * privileged parent makes the decision if the key is allowed 385 * for authentication. 386 */ 387 388 int 389 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 390 { 391 Buffer m; 392 u_char *blob; 393 u_int len; 394 int verified = 0; 395 396 debug3("%s entering", __func__); 397 398 /* Convert the key to a blob and the pass it over */ 399 if (!key_to_blob(key, &blob, &len)) 400 return (0); 401 402 buffer_init(&m); 403 buffer_put_string(&m, blob, len); 404 buffer_put_string(&m, sig, siglen); 405 buffer_put_string(&m, data, datalen); 406 xfree(blob); 407 408 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 409 410 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 411 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 412 413 verified = buffer_get_int(&m); 414 415 buffer_free(&m); 416 417 return (verified); 418 } 419 420 /* Export key state after authentication */ 421 Newkeys * 422 mm_newkeys_from_blob(u_char *blob, int blen) 423 { 424 Buffer b; 425 u_int len; 426 Newkeys *newkey = NULL; 427 Enc *enc; 428 Mac *mac; 429 Comp *comp; 430 431 debug3("%s: %p(%d)", __func__, blob, blen); 432 #ifdef DEBUG_PK 433 dump_base64(stderr, blob, blen); 434 #endif 435 buffer_init(&b); 436 buffer_append(&b, blob, blen); 437 438 newkey = xmalloc(sizeof(*newkey)); 439 enc = &newkey->enc; 440 mac = &newkey->mac; 441 comp = &newkey->comp; 442 443 /* Enc structure */ 444 enc->name = buffer_get_string(&b, NULL); 445 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 446 enc->enabled = buffer_get_int(&b); 447 enc->block_size = buffer_get_int(&b); 448 enc->key = buffer_get_string(&b, &enc->key_len); 449 enc->iv = buffer_get_string(&b, &len); 450 if (len != enc->block_size) 451 fatal("%s: bad ivlen: expected %u != %u", __func__, 452 enc->block_size, len); 453 454 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 455 fatal("%s: bad cipher name %s or pointer %p", __func__, 456 enc->name, enc->cipher); 457 458 /* Mac structure */ 459 mac->name = buffer_get_string(&b, NULL); 460 if (mac->name == NULL || mac_init(mac, mac->name) == -1) 461 fatal("%s: can not init mac %s", __func__, mac->name); 462 mac->enabled = buffer_get_int(&b); 463 mac->key = buffer_get_string(&b, &len); 464 if (len > mac->key_len) 465 fatal("%s: bad mac key length: %u > %d", __func__, len, 466 mac->key_len); 467 mac->key_len = len; 468 469 /* Comp structure */ 470 comp->type = buffer_get_int(&b); 471 comp->enabled = buffer_get_int(&b); 472 comp->name = buffer_get_string(&b, NULL); 473 474 len = buffer_len(&b); 475 if (len != 0) 476 error("newkeys_from_blob: remaining bytes in blob %u", len); 477 buffer_free(&b); 478 return (newkey); 479 } 480 481 int 482 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 483 { 484 Buffer b; 485 int len; 486 Enc *enc; 487 Mac *mac; 488 Comp *comp; 489 Newkeys *newkey = newkeys[mode]; 490 491 debug3("%s: converting %p", __func__, newkey); 492 493 if (newkey == NULL) { 494 error("%s: newkey == NULL", __func__); 495 return 0; 496 } 497 enc = &newkey->enc; 498 mac = &newkey->mac; 499 comp = &newkey->comp; 500 501 buffer_init(&b); 502 /* Enc structure */ 503 buffer_put_cstring(&b, enc->name); 504 /* The cipher struct is constant and shared, you export pointer */ 505 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 506 buffer_put_int(&b, enc->enabled); 507 buffer_put_int(&b, enc->block_size); 508 buffer_put_string(&b, enc->key, enc->key_len); 509 packet_get_keyiv(mode, enc->iv, enc->block_size); 510 buffer_put_string(&b, enc->iv, enc->block_size); 511 512 /* Mac structure */ 513 buffer_put_cstring(&b, mac->name); 514 buffer_put_int(&b, mac->enabled); 515 buffer_put_string(&b, mac->key, mac->key_len); 516 517 /* Comp structure */ 518 buffer_put_int(&b, comp->type); 519 buffer_put_int(&b, comp->enabled); 520 buffer_put_cstring(&b, comp->name); 521 522 len = buffer_len(&b); 523 if (lenp != NULL) 524 *lenp = len; 525 if (blobp != NULL) { 526 *blobp = xmalloc(len); 527 memcpy(*blobp, buffer_ptr(&b), len); 528 } 529 memset(buffer_ptr(&b), 0, len); 530 buffer_free(&b); 531 return len; 532 } 533 534 static void 535 mm_send_kex(Buffer *m, Kex *kex) 536 { 537 buffer_put_string(m, kex->session_id, kex->session_id_len); 538 buffer_put_int(m, kex->we_need); 539 buffer_put_int(m, kex->hostkey_type); 540 buffer_put_int(m, kex->kex_type); 541 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 542 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 543 buffer_put_int(m, kex->flags); 544 buffer_put_cstring(m, kex->client_version_string); 545 buffer_put_cstring(m, kex->server_version_string); 546 } 547 548 void 549 mm_send_keystate(struct monitor *monitor) 550 { 551 Buffer m; 552 u_char *blob, *p; 553 u_int bloblen, plen; 554 u_int32_t seqnr, packets; 555 u_int64_t blocks; 556 557 buffer_init(&m); 558 559 if (!compat20) { 560 u_char iv[24]; 561 u_char *key; 562 u_int ivlen, keylen; 563 564 buffer_put_int(&m, packet_get_protocol_flags()); 565 566 buffer_put_int(&m, packet_get_ssh1_cipher()); 567 568 debug3("%s: Sending ssh1 KEY+IV", __func__); 569 keylen = packet_get_encryption_key(NULL); 570 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 571 keylen = packet_get_encryption_key(key); 572 buffer_put_string(&m, key, keylen); 573 memset(key, 0, keylen); 574 xfree(key); 575 576 ivlen = packet_get_keyiv_len(MODE_OUT); 577 packet_get_keyiv(MODE_OUT, iv, ivlen); 578 buffer_put_string(&m, iv, ivlen); 579 ivlen = packet_get_keyiv_len(MODE_OUT); 580 packet_get_keyiv(MODE_IN, iv, ivlen); 581 buffer_put_string(&m, iv, ivlen); 582 goto skip; 583 } else { 584 /* Kex for rekeying */ 585 mm_send_kex(&m, *monitor->m_pkex); 586 } 587 588 debug3("%s: Sending new keys: %p %p", 589 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 590 591 /* Keys from Kex */ 592 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 593 fatal("%s: conversion of newkeys failed", __func__); 594 595 buffer_put_string(&m, blob, bloblen); 596 xfree(blob); 597 598 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 599 fatal("%s: conversion of newkeys failed", __func__); 600 601 buffer_put_string(&m, blob, bloblen); 602 xfree(blob); 603 604 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets); 605 buffer_put_int(&m, seqnr); 606 buffer_put_int64(&m, blocks); 607 buffer_put_int(&m, packets); 608 packet_get_state(MODE_IN, &seqnr, &blocks, &packets); 609 buffer_put_int(&m, seqnr); 610 buffer_put_int64(&m, blocks); 611 buffer_put_int(&m, packets); 612 613 debug3("%s: New keys have been sent", __func__); 614 skip: 615 /* More key context */ 616 plen = packet_get_keycontext(MODE_OUT, NULL); 617 p = xmalloc(plen+1); 618 packet_get_keycontext(MODE_OUT, p); 619 buffer_put_string(&m, p, plen); 620 xfree(p); 621 622 plen = packet_get_keycontext(MODE_IN, NULL); 623 p = xmalloc(plen+1); 624 packet_get_keycontext(MODE_IN, p); 625 buffer_put_string(&m, p, plen); 626 xfree(p); 627 628 /* Compression state */ 629 debug3("%s: Sending compression state", __func__); 630 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 631 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 632 633 /* Network I/O buffers */ 634 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 635 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 636 637 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 638 debug3("%s: Finished sending state", __func__); 639 640 buffer_free(&m); 641 } 642 643 int 644 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) 645 { 646 Buffer m; 647 char *p, *msg; 648 int success = 0; 649 650 buffer_init(&m); 651 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 652 653 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 654 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 655 656 success = buffer_get_int(&m); 657 if (success == 0) { 658 debug3("%s: pty alloc failed", __func__); 659 buffer_free(&m); 660 return (0); 661 } 662 p = buffer_get_string(&m, NULL); 663 msg = buffer_get_string(&m, NULL); 664 buffer_free(&m); 665 666 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 667 xfree(p); 668 669 buffer_append(&loginmsg, msg, strlen(msg)); 670 xfree(msg); 671 672 *ptyfd = mm_receive_fd(pmonitor->m_recvfd); 673 *ttyfd = mm_receive_fd(pmonitor->m_recvfd); 674 675 /* Success */ 676 return (1); 677 } 678 679 void 680 mm_session_pty_cleanup2(Session *s) 681 { 682 Buffer m; 683 684 if (s->ttyfd == -1) 685 return; 686 buffer_init(&m); 687 buffer_put_cstring(&m, s->tty); 688 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 689 buffer_free(&m); 690 691 /* closed dup'ed master */ 692 if (close(s->ptymaster) < 0) 693 error("close(s->ptymaster): %s", strerror(errno)); 694 695 /* unlink pty from session */ 696 s->ttyfd = -1; 697 } 698 699 #ifdef USE_PAM 700 void 701 mm_start_pam(Authctxt *authctxt) 702 { 703 Buffer m; 704 705 debug3("%s entering", __func__); 706 if (!options.use_pam) 707 fatal("UsePAM=no, but ended up in %s anyway", __func__); 708 709 buffer_init(&m); 710 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 711 712 buffer_free(&m); 713 } 714 715 u_int 716 mm_do_pam_account(void) 717 { 718 Buffer m; 719 u_int ret; 720 721 debug3("%s entering", __func__); 722 if (!options.use_pam) 723 fatal("UsePAM=no, but ended up in %s anyway", __func__); 724 725 buffer_init(&m); 726 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 727 728 mm_request_receive_expect(pmonitor->m_recvfd, 729 MONITOR_ANS_PAM_ACCOUNT, &m); 730 ret = buffer_get_int(&m); 731 732 buffer_free(&m); 733 734 debug3("%s returning %d", __func__, ret); 735 736 return (ret); 737 } 738 739 void * 740 mm_sshpam_init_ctx(Authctxt *authctxt) 741 { 742 Buffer m; 743 int success; 744 745 debug3("%s", __func__); 746 buffer_init(&m); 747 buffer_put_cstring(&m, authctxt->user); 748 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 749 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 750 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 751 success = buffer_get_int(&m); 752 if (success == 0) { 753 debug3("%s: pam_init_ctx failed", __func__); 754 buffer_free(&m); 755 return (NULL); 756 } 757 buffer_free(&m); 758 return (authctxt); 759 } 760 761 int 762 mm_sshpam_query(void *ctx, char **name, char **info, 763 u_int *num, char ***prompts, u_int **echo_on) 764 { 765 Buffer m; 766 int i, ret; 767 768 debug3("%s", __func__); 769 buffer_init(&m); 770 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 771 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 772 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 773 ret = buffer_get_int(&m); 774 debug3("%s: pam_query returned %d", __func__, ret); 775 *name = buffer_get_string(&m, NULL); 776 *info = buffer_get_string(&m, NULL); 777 *num = buffer_get_int(&m); 778 *prompts = xmalloc((*num + 1) * sizeof(char *)); 779 *echo_on = xmalloc((*num + 1) * sizeof(u_int)); 780 for (i = 0; i < *num; ++i) { 781 (*prompts)[i] = buffer_get_string(&m, NULL); 782 (*echo_on)[i] = buffer_get_int(&m); 783 } 784 buffer_free(&m); 785 return (ret); 786 } 787 788 int 789 mm_sshpam_respond(void *ctx, u_int num, char **resp) 790 { 791 Buffer m; 792 int i, ret; 793 794 debug3("%s", __func__); 795 buffer_init(&m); 796 buffer_put_int(&m, num); 797 for (i = 0; i < num; ++i) 798 buffer_put_cstring(&m, resp[i]); 799 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 800 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 801 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 802 ret = buffer_get_int(&m); 803 debug3("%s: pam_respond returned %d", __func__, ret); 804 buffer_free(&m); 805 return (ret); 806 } 807 808 void 809 mm_sshpam_free_ctx(void *ctxtp) 810 { 811 Buffer m; 812 813 debug3("%s", __func__); 814 buffer_init(&m); 815 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 816 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 817 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 818 buffer_free(&m); 819 } 820 #endif /* USE_PAM */ 821 822 /* Request process termination */ 823 824 void 825 mm_terminate(void) 826 { 827 Buffer m; 828 829 buffer_init(&m); 830 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 831 buffer_free(&m); 832 } 833 834 int 835 mm_ssh1_session_key(BIGNUM *num) 836 { 837 int rsafail; 838 Buffer m; 839 840 buffer_init(&m); 841 buffer_put_bignum2(&m, num); 842 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 843 844 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 845 846 rsafail = buffer_get_int(&m); 847 buffer_get_bignum2(&m, num); 848 849 buffer_free(&m); 850 851 return (rsafail); 852 } 853 854 static void 855 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 856 char ***prompts, u_int **echo_on) 857 { 858 *name = xstrdup(""); 859 *infotxt = xstrdup(""); 860 *numprompts = 1; 861 *prompts = xmalloc(*numprompts * sizeof(char *)); 862 *echo_on = xmalloc(*numprompts * sizeof(u_int)); 863 (*echo_on)[0] = 0; 864 } 865 866 int 867 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 868 u_int *numprompts, char ***prompts, u_int **echo_on) 869 { 870 Buffer m; 871 u_int success; 872 char *challenge; 873 874 debug3("%s: entering", __func__); 875 876 buffer_init(&m); 877 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 878 879 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 880 &m); 881 success = buffer_get_int(&m); 882 if (success == 0) { 883 debug3("%s: no challenge", __func__); 884 buffer_free(&m); 885 return (-1); 886 } 887 888 /* Get the challenge, and format the response */ 889 challenge = buffer_get_string(&m, NULL); 890 buffer_free(&m); 891 892 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 893 (*prompts)[0] = challenge; 894 895 debug3("%s: received challenge: %s", __func__, challenge); 896 897 return (0); 898 } 899 900 int 901 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 902 { 903 Buffer m; 904 int authok; 905 906 debug3("%s: entering", __func__); 907 if (numresponses != 1) 908 return (-1); 909 910 buffer_init(&m); 911 buffer_put_cstring(&m, responses[0]); 912 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 913 914 mm_request_receive_expect(pmonitor->m_recvfd, 915 MONITOR_ANS_BSDAUTHRESPOND, &m); 916 917 authok = buffer_get_int(&m); 918 buffer_free(&m); 919 920 return ((authok == 0) ? -1 : 0); 921 } 922 923 #ifdef SKEY 924 int 925 mm_skey_query(void *ctx, char **name, char **infotxt, 926 u_int *numprompts, char ***prompts, u_int **echo_on) 927 { 928 Buffer m; 929 int len; 930 u_int success; 931 char *p, *challenge; 932 933 debug3("%s: entering", __func__); 934 935 buffer_init(&m); 936 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 937 938 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 939 &m); 940 success = buffer_get_int(&m); 941 if (success == 0) { 942 debug3("%s: no challenge", __func__); 943 buffer_free(&m); 944 return (-1); 945 } 946 947 /* Get the challenge, and format the response */ 948 challenge = buffer_get_string(&m, NULL); 949 buffer_free(&m); 950 951 debug3("%s: received challenge: %s", __func__, challenge); 952 953 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 954 955 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; 956 p = xmalloc(len); 957 strlcpy(p, challenge, len); 958 strlcat(p, SKEY_PROMPT, len); 959 (*prompts)[0] = p; 960 xfree(challenge); 961 962 return (0); 963 } 964 965 int 966 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 967 { 968 Buffer m; 969 int authok; 970 971 debug3("%s: entering", __func__); 972 if (numresponses != 1) 973 return (-1); 974 975 buffer_init(&m); 976 buffer_put_cstring(&m, responses[0]); 977 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 978 979 mm_request_receive_expect(pmonitor->m_recvfd, 980 MONITOR_ANS_SKEYRESPOND, &m); 981 982 authok = buffer_get_int(&m); 983 buffer_free(&m); 984 985 return ((authok == 0) ? -1 : 0); 986 } 987 #endif /* SKEY */ 988 989 void 990 mm_ssh1_session_id(u_char session_id[16]) 991 { 992 Buffer m; 993 int i; 994 995 debug3("%s entering", __func__); 996 997 buffer_init(&m); 998 for (i = 0; i < 16; i++) 999 buffer_put_char(&m, session_id[i]); 1000 1001 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 1002 buffer_free(&m); 1003 } 1004 1005 int 1006 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 1007 { 1008 Buffer m; 1009 Key *key; 1010 u_char *blob; 1011 u_int blen; 1012 int allowed = 0, have_forced = 0; 1013 1014 debug3("%s entering", __func__); 1015 1016 buffer_init(&m); 1017 buffer_put_bignum2(&m, client_n); 1018 1019 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 1020 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 1021 1022 allowed = buffer_get_int(&m); 1023 1024 /* fake forced command */ 1025 auth_clear_options(); 1026 have_forced = buffer_get_int(&m); 1027 forced_command = have_forced ? xstrdup("true") : NULL; 1028 1029 if (allowed && rkey != NULL) { 1030 blob = buffer_get_string(&m, &blen); 1031 if ((key = key_from_blob(blob, blen)) == NULL) 1032 fatal("%s: key_from_blob failed", __func__); 1033 *rkey = key; 1034 xfree(blob); 1035 } 1036 mm_send_debug(&m); 1037 buffer_free(&m); 1038 1039 return (allowed); 1040 } 1041 1042 BIGNUM * 1043 mm_auth_rsa_generate_challenge(Key *key) 1044 { 1045 Buffer m; 1046 BIGNUM *challenge; 1047 u_char *blob; 1048 u_int blen; 1049 1050 debug3("%s entering", __func__); 1051 1052 if ((challenge = BN_new()) == NULL) 1053 fatal("%s: BN_new failed", __func__); 1054 1055 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1056 if (key_to_blob(key, &blob, &blen) == 0) 1057 fatal("%s: key_to_blob failed", __func__); 1058 key->type = KEY_RSA1; 1059 1060 buffer_init(&m); 1061 buffer_put_string(&m, blob, blen); 1062 xfree(blob); 1063 1064 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 1065 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 1066 1067 buffer_get_bignum2(&m, challenge); 1068 buffer_free(&m); 1069 1070 return (challenge); 1071 } 1072 1073 int 1074 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 1075 { 1076 Buffer m; 1077 u_char *blob; 1078 u_int blen; 1079 int success = 0; 1080 1081 debug3("%s entering", __func__); 1082 1083 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1084 if (key_to_blob(key, &blob, &blen) == 0) 1085 fatal("%s: key_to_blob failed", __func__); 1086 key->type = KEY_RSA1; 1087 1088 buffer_init(&m); 1089 buffer_put_string(&m, blob, blen); 1090 buffer_put_string(&m, response, 16); 1091 xfree(blob); 1092 1093 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 1094 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 1095 1096 success = buffer_get_int(&m); 1097 buffer_free(&m); 1098 1099 return (success); 1100 } 1101 1102 #ifdef GSSAPI 1103 OM_uint32 1104 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 1105 { 1106 Buffer m; 1107 OM_uint32 major; 1108 1109 /* Client doesn't get to see the context */ 1110 *ctx = NULL; 1111 1112 buffer_init(&m); 1113 buffer_put_string(&m, goid->elements, goid->length); 1114 1115 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 1116 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 1117 1118 major = buffer_get_int(&m); 1119 1120 buffer_free(&m); 1121 return (major); 1122 } 1123 1124 OM_uint32 1125 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 1126 gss_buffer_desc *out, OM_uint32 *flags) 1127 { 1128 Buffer m; 1129 OM_uint32 major; 1130 u_int len; 1131 1132 buffer_init(&m); 1133 buffer_put_string(&m, in->value, in->length); 1134 1135 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 1136 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 1137 1138 major = buffer_get_int(&m); 1139 out->value = buffer_get_string(&m, &len); 1140 out->length = len; 1141 if (flags) 1142 *flags = buffer_get_int(&m); 1143 1144 buffer_free(&m); 1145 1146 return (major); 1147 } 1148 1149 OM_uint32 1150 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 1151 { 1152 Buffer m; 1153 OM_uint32 major; 1154 1155 buffer_init(&m); 1156 buffer_put_string(&m, gssbuf->value, gssbuf->length); 1157 buffer_put_string(&m, gssmic->value, gssmic->length); 1158 1159 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 1160 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 1161 &m); 1162 1163 major = buffer_get_int(&m); 1164 buffer_free(&m); 1165 return(major); 1166 } 1167 1168 int 1169 mm_ssh_gssapi_userok(char *user) 1170 { 1171 Buffer m; 1172 int authenticated = 0; 1173 1174 buffer_init(&m); 1175 1176 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1177 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1178 &m); 1179 1180 authenticated = buffer_get_int(&m); 1181 1182 buffer_free(&m); 1183 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1184 return (authenticated); 1185 } 1186 #endif /* GSSAPI */ 1187