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 1.40 2005/05/24 17:32:43 avsm 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 extern Buffer loginmsg; 77 78 int 79 mm_is_monitor(void) 80 { 81 /* 82 * m_pid is only set in the privileged part, and 83 * points to the unprivileged child. 84 */ 85 return (pmonitor && pmonitor->m_pid > 0); 86 } 87 88 void 89 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 90 { 91 u_int mlen = buffer_len(m); 92 u_char buf[5]; 93 94 debug3("%s entering: type %d", __func__, type); 95 96 PUT_32BIT(buf, mlen + 1); 97 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 98 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 99 fatal("%s: write: %s", __func__, strerror(errno)); 100 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 101 fatal("%s: write: %s", __func__, strerror(errno)); 102 } 103 104 void 105 mm_request_receive(int sock, Buffer *m) 106 { 107 u_char buf[4]; 108 u_int msg_len; 109 110 debug3("%s entering", __func__); 111 112 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 113 if (errno == EPIPE) 114 cleanup_exit(255); 115 fatal("%s: read: %s", __func__, strerror(errno)); 116 } 117 msg_len = GET_32BIT(buf); 118 if (msg_len > 256 * 1024) 119 fatal("%s: read: bad msg_len %d", __func__, msg_len); 120 buffer_clear(m); 121 buffer_append_space(m, msg_len); 122 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 123 fatal("%s: read: %s", __func__, strerror(errno)); 124 } 125 126 void 127 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 128 { 129 u_char rtype; 130 131 debug3("%s entering: type %d", __func__, type); 132 133 mm_request_receive(sock, m); 134 rtype = buffer_get_char(m); 135 if (rtype != type) 136 fatal("%s: read: rtype %d != type %d", __func__, 137 rtype, type); 138 } 139 140 DH * 141 mm_choose_dh(int min, int nbits, int max) 142 { 143 BIGNUM *p, *g; 144 int success = 0; 145 Buffer m; 146 147 buffer_init(&m); 148 buffer_put_int(&m, min); 149 buffer_put_int(&m, nbits); 150 buffer_put_int(&m, max); 151 152 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 153 154 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 155 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 156 157 success = buffer_get_char(&m); 158 if (success == 0) 159 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 160 161 if ((p = BN_new()) == NULL) 162 fatal("%s: BN_new failed", __func__); 163 if ((g = BN_new()) == NULL) 164 fatal("%s: BN_new failed", __func__); 165 buffer_get_bignum2(&m, p); 166 buffer_get_bignum2(&m, g); 167 168 debug3("%s: remaining %d", __func__, buffer_len(&m)); 169 buffer_free(&m); 170 171 return (dh_new_group(g, p)); 172 } 173 174 int 175 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 176 { 177 Kex *kex = *pmonitor->m_pkex; 178 Buffer m; 179 180 debug3("%s entering", __func__); 181 182 buffer_init(&m); 183 buffer_put_int(&m, kex->host_key_index(key)); 184 buffer_put_string(&m, data, datalen); 185 186 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 187 188 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 189 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 190 *sigp = buffer_get_string(&m, lenp); 191 buffer_free(&m); 192 193 return (0); 194 } 195 196 struct passwd * 197 mm_getpwnamallow(const char *username) 198 { 199 Buffer m; 200 struct passwd *pw; 201 u_int pwlen; 202 203 debug3("%s entering", __func__); 204 205 buffer_init(&m); 206 buffer_put_cstring(&m, username); 207 208 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 209 210 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 211 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 212 213 if (buffer_get_char(&m) == 0) { 214 buffer_free(&m); 215 return (NULL); 216 } 217 pw = buffer_get_string(&m, &pwlen); 218 if (pwlen != sizeof(struct passwd)) 219 fatal("%s: struct passwd size mismatch", __func__); 220 pw->pw_name = buffer_get_string(&m, NULL); 221 pw->pw_passwd = buffer_get_string(&m, NULL); 222 pw->pw_gecos = buffer_get_string(&m, NULL); 223 #ifdef HAVE_PW_CLASS_IN_PASSWD 224 pw->pw_class = buffer_get_string(&m, NULL); 225 #endif 226 pw->pw_dir = buffer_get_string(&m, NULL); 227 pw->pw_shell = buffer_get_string(&m, NULL); 228 buffer_free(&m); 229 230 return (pw); 231 } 232 233 char * 234 mm_auth2_read_banner(void) 235 { 236 Buffer m; 237 char *banner; 238 239 debug3("%s entering", __func__); 240 241 buffer_init(&m); 242 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 243 buffer_clear(&m); 244 245 mm_request_receive_expect(pmonitor->m_recvfd, 246 MONITOR_ANS_AUTH2_READ_BANNER, &m); 247 banner = buffer_get_string(&m, NULL); 248 buffer_free(&m); 249 250 /* treat empty banner as missing banner */ 251 if (strlen(banner) == 0) { 252 xfree(banner); 253 banner = NULL; 254 } 255 return (banner); 256 } 257 258 /* Inform the privileged process about service and style */ 259 260 void 261 mm_inform_authserv(char *service, char *style) 262 { 263 Buffer m; 264 265 debug3("%s entering", __func__); 266 267 buffer_init(&m); 268 buffer_put_cstring(&m, service); 269 buffer_put_cstring(&m, style ? style : ""); 270 271 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 272 273 buffer_free(&m); 274 } 275 276 /* Do the password authentication */ 277 int 278 mm_auth_password(Authctxt *authctxt, char *password) 279 { 280 Buffer m; 281 int authenticated = 0; 282 283 debug3("%s entering", __func__); 284 285 buffer_init(&m); 286 buffer_put_cstring(&m, password); 287 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 288 289 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 290 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 291 292 authenticated = buffer_get_int(&m); 293 294 buffer_free(&m); 295 296 debug3("%s: user %sauthenticated", 297 __func__, authenticated ? "" : "not "); 298 return (authenticated); 299 } 300 301 int 302 mm_user_key_allowed(struct passwd *pw, Key *key) 303 { 304 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 305 } 306 307 int 308 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 309 Key *key) 310 { 311 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 312 } 313 314 int 315 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 316 char *host, Key *key) 317 { 318 int ret; 319 320 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 321 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 322 key->type = KEY_RSA1; 323 return (ret); 324 } 325 326 static void 327 mm_send_debug(Buffer *m) 328 { 329 char *msg; 330 331 while (buffer_len(m)) { 332 msg = buffer_get_string(m, NULL); 333 debug3("%s: Sending debug: %s", __func__, msg); 334 packet_send_debug("%s", msg); 335 xfree(msg); 336 } 337 } 338 339 int 340 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 341 { 342 Buffer m; 343 u_char *blob; 344 u_int len; 345 int allowed = 0, have_forced = 0; 346 347 debug3("%s entering", __func__); 348 349 /* Convert the key to a blob and the pass it over */ 350 if (!key_to_blob(key, &blob, &len)) 351 return (0); 352 353 buffer_init(&m); 354 buffer_put_int(&m, type); 355 buffer_put_cstring(&m, user ? user : ""); 356 buffer_put_cstring(&m, host ? host : ""); 357 buffer_put_string(&m, blob, len); 358 xfree(blob); 359 360 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 361 362 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 363 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 364 365 allowed = buffer_get_int(&m); 366 367 /* fake forced command */ 368 auth_clear_options(); 369 have_forced = buffer_get_int(&m); 370 forced_command = have_forced ? xstrdup("true") : NULL; 371 372 /* Send potential debug messages */ 373 mm_send_debug(&m); 374 375 buffer_free(&m); 376 377 return (allowed); 378 } 379 380 /* 381 * This key verify needs to send the key type along, because the 382 * privileged parent makes the decision if the key is allowed 383 * for authentication. 384 */ 385 386 int 387 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 388 { 389 Buffer m; 390 u_char *blob; 391 u_int len; 392 int verified = 0; 393 394 debug3("%s entering", __func__); 395 396 /* Convert the key to a blob and the pass it over */ 397 if (!key_to_blob(key, &blob, &len)) 398 return (0); 399 400 buffer_init(&m); 401 buffer_put_string(&m, blob, len); 402 buffer_put_string(&m, sig, siglen); 403 buffer_put_string(&m, data, datalen); 404 xfree(blob); 405 406 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 407 408 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 409 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 410 411 verified = buffer_get_int(&m); 412 413 buffer_free(&m); 414 415 return (verified); 416 } 417 418 /* Export key state after authentication */ 419 Newkeys * 420 mm_newkeys_from_blob(u_char *blob, int blen) 421 { 422 Buffer b; 423 u_int len; 424 Newkeys *newkey = NULL; 425 Enc *enc; 426 Mac *mac; 427 Comp *comp; 428 429 debug3("%s: %p(%d)", __func__, blob, blen); 430 #ifdef DEBUG_PK 431 dump_base64(stderr, blob, blen); 432 #endif 433 buffer_init(&b); 434 buffer_append(&b, blob, blen); 435 436 newkey = xmalloc(sizeof(*newkey)); 437 enc = &newkey->enc; 438 mac = &newkey->mac; 439 comp = &newkey->comp; 440 441 /* Enc structure */ 442 enc->name = buffer_get_string(&b, NULL); 443 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 444 enc->enabled = buffer_get_int(&b); 445 enc->block_size = buffer_get_int(&b); 446 enc->key = buffer_get_string(&b, &enc->key_len); 447 enc->iv = buffer_get_string(&b, &len); 448 if (len != enc->block_size) 449 fatal("%s: bad ivlen: expected %u != %u", __func__, 450 enc->block_size, len); 451 452 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 453 fatal("%s: bad cipher name %s or pointer %p", __func__, 454 enc->name, enc->cipher); 455 456 /* Mac structure */ 457 mac->name = buffer_get_string(&b, NULL); 458 if (mac->name == NULL || mac_init(mac, mac->name) == -1) 459 fatal("%s: can not init mac %s", __func__, mac->name); 460 mac->enabled = buffer_get_int(&b); 461 mac->key = buffer_get_string(&b, &len); 462 if (len > mac->key_len) 463 fatal("%s: bad mac key length: %u > %d", __func__, len, 464 mac->key_len); 465 mac->key_len = len; 466 467 /* Comp structure */ 468 comp->type = buffer_get_int(&b); 469 comp->enabled = buffer_get_int(&b); 470 comp->name = buffer_get_string(&b, NULL); 471 472 len = buffer_len(&b); 473 if (len != 0) 474 error("newkeys_from_blob: remaining bytes in blob %u", len); 475 buffer_free(&b); 476 return (newkey); 477 } 478 479 int 480 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 481 { 482 Buffer b; 483 int len; 484 Enc *enc; 485 Mac *mac; 486 Comp *comp; 487 Newkeys *newkey = newkeys[mode]; 488 489 debug3("%s: converting %p", __func__, newkey); 490 491 if (newkey == NULL) { 492 error("%s: newkey == NULL", __func__); 493 return 0; 494 } 495 enc = &newkey->enc; 496 mac = &newkey->mac; 497 comp = &newkey->comp; 498 499 buffer_init(&b); 500 /* Enc structure */ 501 buffer_put_cstring(&b, enc->name); 502 /* The cipher struct is constant and shared, you export pointer */ 503 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 504 buffer_put_int(&b, enc->enabled); 505 buffer_put_int(&b, enc->block_size); 506 buffer_put_string(&b, enc->key, enc->key_len); 507 packet_get_keyiv(mode, enc->iv, enc->block_size); 508 buffer_put_string(&b, enc->iv, enc->block_size); 509 510 /* Mac structure */ 511 buffer_put_cstring(&b, mac->name); 512 buffer_put_int(&b, mac->enabled); 513 buffer_put_string(&b, mac->key, mac->key_len); 514 515 /* Comp structure */ 516 buffer_put_int(&b, comp->type); 517 buffer_put_int(&b, comp->enabled); 518 buffer_put_cstring(&b, comp->name); 519 520 len = buffer_len(&b); 521 if (lenp != NULL) 522 *lenp = len; 523 if (blobp != NULL) { 524 *blobp = xmalloc(len); 525 memcpy(*blobp, buffer_ptr(&b), len); 526 } 527 memset(buffer_ptr(&b), 0, len); 528 buffer_free(&b); 529 return len; 530 } 531 532 static void 533 mm_send_kex(Buffer *m, Kex *kex) 534 { 535 buffer_put_string(m, kex->session_id, kex->session_id_len); 536 buffer_put_int(m, kex->we_need); 537 buffer_put_int(m, kex->hostkey_type); 538 buffer_put_int(m, kex->kex_type); 539 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 540 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 541 buffer_put_int(m, kex->flags); 542 buffer_put_cstring(m, kex->client_version_string); 543 buffer_put_cstring(m, kex->server_version_string); 544 } 545 546 void 547 mm_send_keystate(struct monitor *monitor) 548 { 549 Buffer m; 550 u_char *blob, *p; 551 u_int bloblen, plen; 552 u_int32_t seqnr, packets; 553 u_int64_t blocks; 554 555 buffer_init(&m); 556 557 if (!compat20) { 558 u_char iv[24]; 559 u_char *key; 560 u_int ivlen, keylen; 561 562 buffer_put_int(&m, packet_get_protocol_flags()); 563 564 buffer_put_int(&m, packet_get_ssh1_cipher()); 565 566 debug3("%s: Sending ssh1 KEY+IV", __func__); 567 keylen = packet_get_encryption_key(NULL); 568 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 569 keylen = packet_get_encryption_key(key); 570 buffer_put_string(&m, key, keylen); 571 memset(key, 0, keylen); 572 xfree(key); 573 574 ivlen = packet_get_keyiv_len(MODE_OUT); 575 packet_get_keyiv(MODE_OUT, iv, ivlen); 576 buffer_put_string(&m, iv, ivlen); 577 ivlen = packet_get_keyiv_len(MODE_OUT); 578 packet_get_keyiv(MODE_IN, iv, ivlen); 579 buffer_put_string(&m, iv, ivlen); 580 goto skip; 581 } else { 582 /* Kex for rekeying */ 583 mm_send_kex(&m, *monitor->m_pkex); 584 } 585 586 debug3("%s: Sending new keys: %p %p", 587 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 588 589 /* Keys from Kex */ 590 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 591 fatal("%s: conversion of newkeys failed", __func__); 592 593 buffer_put_string(&m, blob, bloblen); 594 xfree(blob); 595 596 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 597 fatal("%s: conversion of newkeys failed", __func__); 598 599 buffer_put_string(&m, blob, bloblen); 600 xfree(blob); 601 602 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets); 603 buffer_put_int(&m, seqnr); 604 buffer_put_int64(&m, blocks); 605 buffer_put_int(&m, packets); 606 packet_get_state(MODE_IN, &seqnr, &blocks, &packets); 607 buffer_put_int(&m, seqnr); 608 buffer_put_int64(&m, blocks); 609 buffer_put_int(&m, packets); 610 611 debug3("%s: New keys have been sent", __func__); 612 skip: 613 /* More key context */ 614 plen = packet_get_keycontext(MODE_OUT, NULL); 615 p = xmalloc(plen+1); 616 packet_get_keycontext(MODE_OUT, p); 617 buffer_put_string(&m, p, plen); 618 xfree(p); 619 620 plen = packet_get_keycontext(MODE_IN, NULL); 621 p = xmalloc(plen+1); 622 packet_get_keycontext(MODE_IN, p); 623 buffer_put_string(&m, p, plen); 624 xfree(p); 625 626 /* Compression state */ 627 debug3("%s: Sending compression state", __func__); 628 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 629 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 630 631 /* Network I/O buffers */ 632 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 633 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 634 635 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 636 debug3("%s: Finished sending state", __func__); 637 638 buffer_free(&m); 639 } 640 641 int 642 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) 643 { 644 Buffer m; 645 char *p, *msg; 646 int success = 0; 647 648 buffer_init(&m); 649 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 650 651 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 652 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 653 654 success = buffer_get_int(&m); 655 if (success == 0) { 656 debug3("%s: pty alloc failed", __func__); 657 buffer_free(&m); 658 return (0); 659 } 660 p = buffer_get_string(&m, NULL); 661 msg = buffer_get_string(&m, NULL); 662 buffer_free(&m); 663 664 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 665 xfree(p); 666 667 buffer_append(&loginmsg, msg, strlen(msg)); 668 xfree(msg); 669 670 *ptyfd = mm_receive_fd(pmonitor->m_recvfd); 671 *ttyfd = mm_receive_fd(pmonitor->m_recvfd); 672 673 /* Success */ 674 return (1); 675 } 676 677 void 678 mm_session_pty_cleanup2(Session *s) 679 { 680 Buffer m; 681 682 if (s->ttyfd == -1) 683 return; 684 buffer_init(&m); 685 buffer_put_cstring(&m, s->tty); 686 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 687 buffer_free(&m); 688 689 /* closed dup'ed master */ 690 if (close(s->ptymaster) < 0) 691 error("close(s->ptymaster): %s", strerror(errno)); 692 693 /* unlink pty from session */ 694 s->ttyfd = -1; 695 } 696 697 #ifdef USE_PAM 698 void 699 mm_start_pam(Authctxt *authctxt) 700 { 701 Buffer m; 702 703 debug3("%s entering", __func__); 704 if (!options.use_pam) 705 fatal("UsePAM=no, but ended up in %s anyway", __func__); 706 707 buffer_init(&m); 708 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 709 710 buffer_free(&m); 711 } 712 713 u_int 714 mm_do_pam_account(void) 715 { 716 Buffer m; 717 u_int ret; 718 char *msg; 719 720 debug3("%s entering", __func__); 721 if (!options.use_pam) 722 fatal("UsePAM=no, but ended up in %s anyway", __func__); 723 724 buffer_init(&m); 725 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 726 727 mm_request_receive_expect(pmonitor->m_recvfd, 728 MONITOR_ANS_PAM_ACCOUNT, &m); 729 ret = buffer_get_int(&m); 730 msg = buffer_get_string(&m, NULL); 731 buffer_append(&loginmsg, msg, strlen(msg)); 732 xfree(msg); 733 734 buffer_free(&m); 735 736 debug3("%s returning %d", __func__, ret); 737 738 return (ret); 739 } 740 741 void * 742 mm_sshpam_init_ctx(Authctxt *authctxt) 743 { 744 Buffer m; 745 int success; 746 747 debug3("%s", __func__); 748 buffer_init(&m); 749 buffer_put_cstring(&m, authctxt->user); 750 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 751 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 752 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 753 success = buffer_get_int(&m); 754 if (success == 0) { 755 debug3("%s: pam_init_ctx failed", __func__); 756 buffer_free(&m); 757 return (NULL); 758 } 759 buffer_free(&m); 760 return (authctxt); 761 } 762 763 int 764 mm_sshpam_query(void *ctx, char **name, char **info, 765 u_int *num, char ***prompts, u_int **echo_on) 766 { 767 Buffer m; 768 u_int i; 769 int ret; 770 771 debug3("%s", __func__); 772 buffer_init(&m); 773 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 774 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 775 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 776 ret = buffer_get_int(&m); 777 debug3("%s: pam_query returned %d", __func__, ret); 778 *name = buffer_get_string(&m, NULL); 779 *info = buffer_get_string(&m, NULL); 780 *num = buffer_get_int(&m); 781 *prompts = xmalloc((*num + 1) * sizeof(char *)); 782 *echo_on = xmalloc((*num + 1) * sizeof(u_int)); 783 for (i = 0; i < *num; ++i) { 784 (*prompts)[i] = buffer_get_string(&m, NULL); 785 (*echo_on)[i] = buffer_get_int(&m); 786 } 787 buffer_free(&m); 788 return (ret); 789 } 790 791 int 792 mm_sshpam_respond(void *ctx, u_int num, char **resp) 793 { 794 Buffer m; 795 u_int i; 796 int ret; 797 798 debug3("%s", __func__); 799 buffer_init(&m); 800 buffer_put_int(&m, num); 801 for (i = 0; i < num; ++i) 802 buffer_put_cstring(&m, resp[i]); 803 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 804 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 805 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 806 ret = buffer_get_int(&m); 807 debug3("%s: pam_respond returned %d", __func__, ret); 808 buffer_free(&m); 809 return (ret); 810 } 811 812 void 813 mm_sshpam_free_ctx(void *ctxtp) 814 { 815 Buffer m; 816 817 debug3("%s", __func__); 818 buffer_init(&m); 819 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 820 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 821 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 822 buffer_free(&m); 823 } 824 #endif /* USE_PAM */ 825 826 /* Request process termination */ 827 828 void 829 mm_terminate(void) 830 { 831 Buffer m; 832 833 buffer_init(&m); 834 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 835 buffer_free(&m); 836 } 837 838 int 839 mm_ssh1_session_key(BIGNUM *num) 840 { 841 int rsafail; 842 Buffer m; 843 844 buffer_init(&m); 845 buffer_put_bignum2(&m, num); 846 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 847 848 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 849 850 rsafail = buffer_get_int(&m); 851 buffer_get_bignum2(&m, num); 852 853 buffer_free(&m); 854 855 return (rsafail); 856 } 857 858 static void 859 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 860 char ***prompts, u_int **echo_on) 861 { 862 *name = xstrdup(""); 863 *infotxt = xstrdup(""); 864 *numprompts = 1; 865 *prompts = xmalloc(*numprompts * sizeof(char *)); 866 *echo_on = xmalloc(*numprompts * sizeof(u_int)); 867 (*echo_on)[0] = 0; 868 } 869 870 int 871 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 872 u_int *numprompts, char ***prompts, u_int **echo_on) 873 { 874 Buffer m; 875 u_int success; 876 char *challenge; 877 878 debug3("%s: entering", __func__); 879 880 buffer_init(&m); 881 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 882 883 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 884 &m); 885 success = buffer_get_int(&m); 886 if (success == 0) { 887 debug3("%s: no challenge", __func__); 888 buffer_free(&m); 889 return (-1); 890 } 891 892 /* Get the challenge, and format the response */ 893 challenge = buffer_get_string(&m, NULL); 894 buffer_free(&m); 895 896 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 897 (*prompts)[0] = challenge; 898 899 debug3("%s: received challenge: %s", __func__, challenge); 900 901 return (0); 902 } 903 904 int 905 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 906 { 907 Buffer m; 908 int authok; 909 910 debug3("%s: entering", __func__); 911 if (numresponses != 1) 912 return (-1); 913 914 buffer_init(&m); 915 buffer_put_cstring(&m, responses[0]); 916 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 917 918 mm_request_receive_expect(pmonitor->m_recvfd, 919 MONITOR_ANS_BSDAUTHRESPOND, &m); 920 921 authok = buffer_get_int(&m); 922 buffer_free(&m); 923 924 return ((authok == 0) ? -1 : 0); 925 } 926 927 #ifdef SKEY 928 int 929 mm_skey_query(void *ctx, char **name, char **infotxt, 930 u_int *numprompts, char ***prompts, u_int **echo_on) 931 { 932 Buffer m; 933 int len; 934 u_int success; 935 char *p, *challenge; 936 937 debug3("%s: entering", __func__); 938 939 buffer_init(&m); 940 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 941 942 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 943 &m); 944 success = buffer_get_int(&m); 945 if (success == 0) { 946 debug3("%s: no challenge", __func__); 947 buffer_free(&m); 948 return (-1); 949 } 950 951 /* Get the challenge, and format the response */ 952 challenge = buffer_get_string(&m, NULL); 953 buffer_free(&m); 954 955 debug3("%s: received challenge: %s", __func__, challenge); 956 957 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 958 959 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; 960 p = xmalloc(len); 961 strlcpy(p, challenge, len); 962 strlcat(p, SKEY_PROMPT, len); 963 (*prompts)[0] = p; 964 xfree(challenge); 965 966 return (0); 967 } 968 969 int 970 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 971 { 972 Buffer m; 973 int authok; 974 975 debug3("%s: entering", __func__); 976 if (numresponses != 1) 977 return (-1); 978 979 buffer_init(&m); 980 buffer_put_cstring(&m, responses[0]); 981 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 982 983 mm_request_receive_expect(pmonitor->m_recvfd, 984 MONITOR_ANS_SKEYRESPOND, &m); 985 986 authok = buffer_get_int(&m); 987 buffer_free(&m); 988 989 return ((authok == 0) ? -1 : 0); 990 } 991 #endif /* SKEY */ 992 993 void 994 mm_ssh1_session_id(u_char session_id[16]) 995 { 996 Buffer m; 997 int i; 998 999 debug3("%s entering", __func__); 1000 1001 buffer_init(&m); 1002 for (i = 0; i < 16; i++) 1003 buffer_put_char(&m, session_id[i]); 1004 1005 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 1006 buffer_free(&m); 1007 } 1008 1009 int 1010 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 1011 { 1012 Buffer m; 1013 Key *key; 1014 u_char *blob; 1015 u_int blen; 1016 int allowed = 0, have_forced = 0; 1017 1018 debug3("%s entering", __func__); 1019 1020 buffer_init(&m); 1021 buffer_put_bignum2(&m, client_n); 1022 1023 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 1024 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 1025 1026 allowed = buffer_get_int(&m); 1027 1028 /* fake forced command */ 1029 auth_clear_options(); 1030 have_forced = buffer_get_int(&m); 1031 forced_command = have_forced ? xstrdup("true") : NULL; 1032 1033 if (allowed && rkey != NULL) { 1034 blob = buffer_get_string(&m, &blen); 1035 if ((key = key_from_blob(blob, blen)) == NULL) 1036 fatal("%s: key_from_blob failed", __func__); 1037 *rkey = key; 1038 xfree(blob); 1039 } 1040 mm_send_debug(&m); 1041 buffer_free(&m); 1042 1043 return (allowed); 1044 } 1045 1046 BIGNUM * 1047 mm_auth_rsa_generate_challenge(Key *key) 1048 { 1049 Buffer m; 1050 BIGNUM *challenge; 1051 u_char *blob; 1052 u_int blen; 1053 1054 debug3("%s entering", __func__); 1055 1056 if ((challenge = BN_new()) == NULL) 1057 fatal("%s: BN_new failed", __func__); 1058 1059 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1060 if (key_to_blob(key, &blob, &blen) == 0) 1061 fatal("%s: key_to_blob failed", __func__); 1062 key->type = KEY_RSA1; 1063 1064 buffer_init(&m); 1065 buffer_put_string(&m, blob, blen); 1066 xfree(blob); 1067 1068 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 1069 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 1070 1071 buffer_get_bignum2(&m, challenge); 1072 buffer_free(&m); 1073 1074 return (challenge); 1075 } 1076 1077 int 1078 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 1079 { 1080 Buffer m; 1081 u_char *blob; 1082 u_int blen; 1083 int success = 0; 1084 1085 debug3("%s entering", __func__); 1086 1087 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1088 if (key_to_blob(key, &blob, &blen) == 0) 1089 fatal("%s: key_to_blob failed", __func__); 1090 key->type = KEY_RSA1; 1091 1092 buffer_init(&m); 1093 buffer_put_string(&m, blob, blen); 1094 buffer_put_string(&m, response, 16); 1095 xfree(blob); 1096 1097 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 1098 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 1099 1100 success = buffer_get_int(&m); 1101 buffer_free(&m); 1102 1103 return (success); 1104 } 1105 1106 #ifdef SSH_AUDIT_EVENTS 1107 void 1108 mm_audit_event(ssh_audit_event_t event) 1109 { 1110 Buffer m; 1111 1112 debug3("%s entering", __func__); 1113 1114 buffer_init(&m); 1115 buffer_put_int(&m, event); 1116 1117 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); 1118 buffer_free(&m); 1119 } 1120 1121 void 1122 mm_audit_run_command(const char *command) 1123 { 1124 Buffer m; 1125 1126 debug3("%s entering command %s", __func__, command); 1127 1128 buffer_init(&m); 1129 buffer_put_cstring(&m, command); 1130 1131 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); 1132 buffer_free(&m); 1133 } 1134 #endif /* SSH_AUDIT_EVENTS */ 1135 1136 #ifdef GSSAPI 1137 OM_uint32 1138 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 1139 { 1140 Buffer m; 1141 OM_uint32 major; 1142 1143 /* Client doesn't get to see the context */ 1144 *ctx = NULL; 1145 1146 buffer_init(&m); 1147 buffer_put_string(&m, goid->elements, goid->length); 1148 1149 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 1150 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 1151 1152 major = buffer_get_int(&m); 1153 1154 buffer_free(&m); 1155 return (major); 1156 } 1157 1158 OM_uint32 1159 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 1160 gss_buffer_desc *out, OM_uint32 *flags) 1161 { 1162 Buffer m; 1163 OM_uint32 major; 1164 u_int len; 1165 1166 buffer_init(&m); 1167 buffer_put_string(&m, in->value, in->length); 1168 1169 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 1170 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 1171 1172 major = buffer_get_int(&m); 1173 out->value = buffer_get_string(&m, &len); 1174 out->length = len; 1175 if (flags) 1176 *flags = buffer_get_int(&m); 1177 1178 buffer_free(&m); 1179 1180 return (major); 1181 } 1182 1183 OM_uint32 1184 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 1185 { 1186 Buffer m; 1187 OM_uint32 major; 1188 1189 buffer_init(&m); 1190 buffer_put_string(&m, gssbuf->value, gssbuf->length); 1191 buffer_put_string(&m, gssmic->value, gssmic->length); 1192 1193 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 1194 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 1195 &m); 1196 1197 major = buffer_get_int(&m); 1198 buffer_free(&m); 1199 return(major); 1200 } 1201 1202 int 1203 mm_ssh_gssapi_userok(char *user) 1204 { 1205 Buffer m; 1206 int authenticated = 0; 1207 1208 buffer_init(&m); 1209 1210 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1211 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1212 &m); 1213 1214 authenticated = buffer_get_int(&m); 1215 1216 buffer_free(&m); 1217 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1218 return (authenticated); 1219 } 1220 #endif /* GSSAPI */ 1221