1 /* $OpenBSD: monitor_wrap.c,v 1.63 2008/07/10 18:08:11 markus Exp $ */ 2 /* 3 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 4 * Copyright 2002 Markus Friedl <markus@openbsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/types.h> 29 #include <sys/uio.h> 30 #include <sys/queue.h> 31 32 #include <openssl/bn.h> 33 #include <openssl/dh.h> 34 35 #include <errno.h> 36 #include <pwd.h> 37 #include <signal.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 #include "xmalloc.h" 43 #include "ssh.h" 44 #include "dh.h" 45 #include "buffer.h" 46 #include "key.h" 47 #include "cipher.h" 48 #include "kex.h" 49 #include "hostfile.h" 50 #include "auth.h" 51 #include "auth-options.h" 52 #include "packet.h" 53 #include "mac.h" 54 #include "log.h" 55 #include <zlib.h> 56 #include "monitor.h" 57 #ifdef GSSAPI 58 #include "ssh-gss.h" 59 #endif 60 #include "monitor_wrap.h" 61 #include "atomicio.h" 62 #include "monitor_fdpass.h" 63 #include "misc.h" 64 65 #include "channels.h" 66 #include "session.h" 67 #include "servconf.h" 68 69 /* Imports */ 70 extern int compat20; 71 extern Newkeys *newkeys[]; 72 extern z_stream incoming_stream; 73 extern z_stream outgoing_stream; 74 extern struct monitor *pmonitor; 75 extern Buffer input, output; 76 extern Buffer loginmsg; 77 extern ServerOptions options; 78 79 int 80 mm_is_monitor(void) 81 { 82 /* 83 * m_pid is only set in the privileged part, and 84 * points to the unprivileged child. 85 */ 86 return (pmonitor && pmonitor->m_pid > 0); 87 } 88 89 void 90 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 91 { 92 u_int mlen = buffer_len(m); 93 u_char buf[5]; 94 95 debug3("%s entering: type %d", __func__, type); 96 97 put_u32(buf, mlen + 1); 98 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 99 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 100 fatal("%s: write: %s", __func__, strerror(errno)); 101 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 102 fatal("%s: write: %s", __func__, strerror(errno)); 103 } 104 105 void 106 mm_request_receive(int sock, Buffer *m) 107 { 108 u_char buf[4]; 109 u_int msg_len; 110 111 debug3("%s entering", __func__); 112 113 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 114 if (errno == EPIPE) 115 cleanup_exit(255); 116 fatal("%s: read: %s", __func__, strerror(errno)); 117 } 118 msg_len = get_u32(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 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 124 fatal("%s: read: %s", __func__, strerror(errno)); 125 } 126 127 void 128 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 129 { 130 u_char rtype; 131 132 debug3("%s entering: type %d", __func__, type); 133 134 mm_request_receive(sock, m); 135 rtype = buffer_get_char(m); 136 if (rtype != type) 137 fatal("%s: read: rtype %d != type %d", __func__, 138 rtype, type); 139 } 140 141 DH * 142 mm_choose_dh(int min, int nbits, int max) 143 { 144 BIGNUM *p, *g; 145 int success = 0; 146 Buffer m; 147 148 buffer_init(&m); 149 buffer_put_int(&m, min); 150 buffer_put_int(&m, nbits); 151 buffer_put_int(&m, max); 152 153 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 154 155 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 156 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 157 158 success = buffer_get_char(&m); 159 if (success == 0) 160 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 161 162 if ((p = BN_new()) == NULL) 163 fatal("%s: BN_new failed", __func__); 164 if ((g = BN_new()) == NULL) 165 fatal("%s: BN_new failed", __func__); 166 buffer_get_bignum2(&m, p); 167 buffer_get_bignum2(&m, g); 168 169 debug3("%s: remaining %d", __func__, buffer_len(&m)); 170 buffer_free(&m); 171 172 return (dh_new_group(g, p)); 173 } 174 175 int 176 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 177 { 178 Kex *kex = *pmonitor->m_pkex; 179 Buffer m; 180 181 debug3("%s entering", __func__); 182 183 buffer_init(&m); 184 buffer_put_int(&m, kex->host_key_index(key)); 185 buffer_put_string(&m, data, datalen); 186 187 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 188 189 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 190 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 191 *sigp = buffer_get_string(&m, lenp); 192 buffer_free(&m); 193 194 return (0); 195 } 196 197 struct passwd * 198 mm_getpwnamallow(const char *username) 199 { 200 Buffer m; 201 struct passwd *pw; 202 u_int len; 203 ServerOptions *newopts; 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 pw = NULL; 217 goto out; 218 } 219 pw = buffer_get_string(&m, &len); 220 if (len != 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 pw->pw_class = buffer_get_string(&m, NULL); 226 pw->pw_dir = buffer_get_string(&m, NULL); 227 pw->pw_shell = buffer_get_string(&m, NULL); 228 229 out: 230 /* copy options block as a Match directive may have changed some */ 231 newopts = buffer_get_string(&m, &len); 232 if (len != sizeof(*newopts)) 233 fatal("%s: option block size mismatch", __func__); 234 if (newopts->banner != NULL) 235 newopts->banner = buffer_get_string(&m, NULL); 236 copy_set_server_options(&options, newopts, 1); 237 xfree(newopts); 238 239 buffer_free(&m); 240 241 return (pw); 242 } 243 244 char * 245 mm_auth2_read_banner(void) 246 { 247 Buffer m; 248 char *banner; 249 250 debug3("%s entering", __func__); 251 252 buffer_init(&m); 253 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 254 buffer_clear(&m); 255 256 mm_request_receive_expect(pmonitor->m_recvfd, 257 MONITOR_ANS_AUTH2_READ_BANNER, &m); 258 banner = buffer_get_string(&m, NULL); 259 buffer_free(&m); 260 261 /* treat empty banner as missing banner */ 262 if (strlen(banner) == 0) { 263 xfree(banner); 264 banner = NULL; 265 } 266 return (banner); 267 } 268 269 /* Inform the privileged process about service and style */ 270 271 void 272 mm_inform_authserv(char *service, char *style) 273 { 274 Buffer m; 275 276 debug3("%s entering", __func__); 277 278 buffer_init(&m); 279 buffer_put_cstring(&m, service); 280 buffer_put_cstring(&m, style ? style : ""); 281 282 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 283 284 buffer_free(&m); 285 } 286 287 /* Do the password authentication */ 288 int 289 mm_auth_password(Authctxt *authctxt, char *password) 290 { 291 Buffer m; 292 int authenticated = 0; 293 294 debug3("%s entering", __func__); 295 296 buffer_init(&m); 297 buffer_put_cstring(&m, password); 298 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 299 300 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 301 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 302 303 authenticated = buffer_get_int(&m); 304 305 buffer_free(&m); 306 307 debug3("%s: user %sauthenticated", 308 __func__, authenticated ? "" : "not "); 309 return (authenticated); 310 } 311 312 int 313 mm_user_key_allowed(struct passwd *pw, Key *key) 314 { 315 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 316 } 317 318 int 319 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 320 Key *key) 321 { 322 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 323 } 324 325 int 326 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 327 char *host, Key *key) 328 { 329 int ret; 330 331 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 332 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 333 key->type = KEY_RSA1; 334 return (ret); 335 } 336 337 static void 338 mm_send_debug(Buffer *m) 339 { 340 char *msg; 341 342 while (buffer_len(m)) { 343 msg = buffer_get_string(m, NULL); 344 debug3("%s: Sending debug: %s", __func__, msg); 345 packet_send_debug("%s", msg); 346 xfree(msg); 347 } 348 } 349 350 int 351 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 352 { 353 Buffer m; 354 u_char *blob; 355 u_int len; 356 int allowed = 0, have_forced = 0; 357 358 debug3("%s entering", __func__); 359 360 /* Convert the key to a blob and the pass it over */ 361 if (!key_to_blob(key, &blob, &len)) 362 return (0); 363 364 buffer_init(&m); 365 buffer_put_int(&m, type); 366 buffer_put_cstring(&m, user ? user : ""); 367 buffer_put_cstring(&m, host ? host : ""); 368 buffer_put_string(&m, blob, len); 369 xfree(blob); 370 371 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 372 373 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 374 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 375 376 allowed = buffer_get_int(&m); 377 378 /* fake forced command */ 379 auth_clear_options(); 380 have_forced = buffer_get_int(&m); 381 forced_command = have_forced ? xstrdup("true") : NULL; 382 383 /* Send potential debug messages */ 384 mm_send_debug(&m); 385 386 buffer_free(&m); 387 388 return (allowed); 389 } 390 391 /* 392 * This key verify needs to send the key type along, because the 393 * privileged parent makes the decision if the key is allowed 394 * for authentication. 395 */ 396 397 int 398 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 399 { 400 Buffer m; 401 u_char *blob; 402 u_int len; 403 int verified = 0; 404 405 debug3("%s entering", __func__); 406 407 /* Convert the key to a blob and the pass it over */ 408 if (!key_to_blob(key, &blob, &len)) 409 return (0); 410 411 buffer_init(&m); 412 buffer_put_string(&m, blob, len); 413 buffer_put_string(&m, sig, siglen); 414 buffer_put_string(&m, data, datalen); 415 xfree(blob); 416 417 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 418 419 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 420 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 421 422 verified = buffer_get_int(&m); 423 424 buffer_free(&m); 425 426 return (verified); 427 } 428 429 /* Export key state after authentication */ 430 Newkeys * 431 mm_newkeys_from_blob(u_char *blob, int blen) 432 { 433 Buffer b; 434 u_int len; 435 Newkeys *newkey = NULL; 436 Enc *enc; 437 Mac *mac; 438 Comp *comp; 439 440 debug3("%s: %p(%d)", __func__, blob, blen); 441 #ifdef DEBUG_PK 442 dump_base64(stderr, blob, blen); 443 #endif 444 buffer_init(&b); 445 buffer_append(&b, blob, blen); 446 447 newkey = xmalloc(sizeof(*newkey)); 448 enc = &newkey->enc; 449 mac = &newkey->mac; 450 comp = &newkey->comp; 451 452 /* Enc structure */ 453 enc->name = buffer_get_string(&b, NULL); 454 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 455 enc->enabled = buffer_get_int(&b); 456 enc->block_size = buffer_get_int(&b); 457 enc->key = buffer_get_string(&b, &enc->key_len); 458 enc->iv = buffer_get_string(&b, &len); 459 if (len != enc->block_size) 460 fatal("%s: bad ivlen: expected %u != %u", __func__, 461 enc->block_size, len); 462 463 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 464 fatal("%s: bad cipher name %s or pointer %p", __func__, 465 enc->name, enc->cipher); 466 467 /* Mac structure */ 468 mac->name = buffer_get_string(&b, NULL); 469 if (mac->name == NULL || mac_setup(mac, mac->name) == -1) 470 fatal("%s: can not setup mac %s", __func__, mac->name); 471 mac->enabled = buffer_get_int(&b); 472 mac->key = buffer_get_string(&b, &len); 473 if (len > mac->key_len) 474 fatal("%s: bad mac key length: %u > %d", __func__, len, 475 mac->key_len); 476 mac->key_len = len; 477 478 /* Comp structure */ 479 comp->type = buffer_get_int(&b); 480 comp->enabled = buffer_get_int(&b); 481 comp->name = buffer_get_string(&b, NULL); 482 483 len = buffer_len(&b); 484 if (len != 0) 485 error("newkeys_from_blob: remaining bytes in blob %u", len); 486 buffer_free(&b); 487 return (newkey); 488 } 489 490 int 491 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 492 { 493 Buffer b; 494 int len; 495 Enc *enc; 496 Mac *mac; 497 Comp *comp; 498 Newkeys *newkey = newkeys[mode]; 499 500 debug3("%s: converting %p", __func__, newkey); 501 502 if (newkey == NULL) { 503 error("%s: newkey == NULL", __func__); 504 return 0; 505 } 506 enc = &newkey->enc; 507 mac = &newkey->mac; 508 comp = &newkey->comp; 509 510 buffer_init(&b); 511 /* Enc structure */ 512 buffer_put_cstring(&b, enc->name); 513 /* The cipher struct is constant and shared, you export pointer */ 514 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 515 buffer_put_int(&b, enc->enabled); 516 buffer_put_int(&b, enc->block_size); 517 buffer_put_string(&b, enc->key, enc->key_len); 518 packet_get_keyiv(mode, enc->iv, enc->block_size); 519 buffer_put_string(&b, enc->iv, enc->block_size); 520 521 /* Mac structure */ 522 buffer_put_cstring(&b, mac->name); 523 buffer_put_int(&b, mac->enabled); 524 buffer_put_string(&b, mac->key, mac->key_len); 525 526 /* Comp structure */ 527 buffer_put_int(&b, comp->type); 528 buffer_put_int(&b, comp->enabled); 529 buffer_put_cstring(&b, comp->name); 530 531 len = buffer_len(&b); 532 if (lenp != NULL) 533 *lenp = len; 534 if (blobp != NULL) { 535 *blobp = xmalloc(len); 536 memcpy(*blobp, buffer_ptr(&b), len); 537 } 538 memset(buffer_ptr(&b), 0, len); 539 buffer_free(&b); 540 return len; 541 } 542 543 static void 544 mm_send_kex(Buffer *m, Kex *kex) 545 { 546 buffer_put_string(m, kex->session_id, kex->session_id_len); 547 buffer_put_int(m, kex->we_need); 548 buffer_put_int(m, kex->hostkey_type); 549 buffer_put_int(m, kex->kex_type); 550 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 551 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 552 buffer_put_int(m, kex->flags); 553 buffer_put_cstring(m, kex->client_version_string); 554 buffer_put_cstring(m, kex->server_version_string); 555 } 556 557 void 558 mm_send_keystate(struct monitor *monitor) 559 { 560 Buffer m; 561 u_char *blob, *p; 562 u_int bloblen, plen; 563 u_int32_t seqnr, packets; 564 u_int64_t blocks, bytes; 565 566 buffer_init(&m); 567 568 if (!compat20) { 569 u_char iv[24]; 570 u_char *key; 571 u_int ivlen, keylen; 572 573 buffer_put_int(&m, packet_get_protocol_flags()); 574 575 buffer_put_int(&m, packet_get_ssh1_cipher()); 576 577 debug3("%s: Sending ssh1 KEY+IV", __func__); 578 keylen = packet_get_encryption_key(NULL); 579 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 580 keylen = packet_get_encryption_key(key); 581 buffer_put_string(&m, key, keylen); 582 memset(key, 0, keylen); 583 xfree(key); 584 585 ivlen = packet_get_keyiv_len(MODE_OUT); 586 packet_get_keyiv(MODE_OUT, iv, ivlen); 587 buffer_put_string(&m, iv, ivlen); 588 ivlen = packet_get_keyiv_len(MODE_OUT); 589 packet_get_keyiv(MODE_IN, iv, ivlen); 590 buffer_put_string(&m, iv, ivlen); 591 goto skip; 592 } else { 593 /* Kex for rekeying */ 594 mm_send_kex(&m, *monitor->m_pkex); 595 } 596 597 debug3("%s: Sending new keys: %p %p", 598 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 599 600 /* Keys from Kex */ 601 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 602 fatal("%s: conversion of newkeys failed", __func__); 603 604 buffer_put_string(&m, blob, bloblen); 605 xfree(blob); 606 607 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 608 fatal("%s: conversion of newkeys failed", __func__); 609 610 buffer_put_string(&m, blob, bloblen); 611 xfree(blob); 612 613 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); 614 buffer_put_int(&m, seqnr); 615 buffer_put_int64(&m, blocks); 616 buffer_put_int(&m, packets); 617 buffer_put_int64(&m, bytes); 618 packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); 619 buffer_put_int(&m, seqnr); 620 buffer_put_int64(&m, blocks); 621 buffer_put_int(&m, packets); 622 buffer_put_int64(&m, bytes); 623 624 debug3("%s: New keys have been sent", __func__); 625 skip: 626 /* More key context */ 627 plen = packet_get_keycontext(MODE_OUT, NULL); 628 p = xmalloc(plen+1); 629 packet_get_keycontext(MODE_OUT, p); 630 buffer_put_string(&m, p, plen); 631 xfree(p); 632 633 plen = packet_get_keycontext(MODE_IN, NULL); 634 p = xmalloc(plen+1); 635 packet_get_keycontext(MODE_IN, p); 636 buffer_put_string(&m, p, plen); 637 xfree(p); 638 639 /* Compression state */ 640 debug3("%s: Sending compression state", __func__); 641 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 642 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 643 644 /* Network I/O buffers */ 645 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 646 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 647 648 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 649 debug3("%s: Finished sending state", __func__); 650 651 buffer_free(&m); 652 } 653 654 int 655 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 656 { 657 Buffer m; 658 char *p, *msg; 659 int success = 0, tmp1 = -1, tmp2 = -1; 660 661 /* Kludge: ensure there are fds free to receive the pty/tty */ 662 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 663 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 664 error("%s: cannot allocate fds for pty", __func__); 665 if (tmp1 > 0) 666 close(tmp1); 667 if (tmp2 > 0) 668 close(tmp2); 669 return 0; 670 } 671 close(tmp1); 672 close(tmp2); 673 674 buffer_init(&m); 675 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 676 677 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 678 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 679 680 success = buffer_get_int(&m); 681 if (success == 0) { 682 debug3("%s: pty alloc failed", __func__); 683 buffer_free(&m); 684 return (0); 685 } 686 p = buffer_get_string(&m, NULL); 687 msg = buffer_get_string(&m, NULL); 688 buffer_free(&m); 689 690 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 691 xfree(p); 692 693 buffer_append(&loginmsg, msg, strlen(msg)); 694 xfree(msg); 695 696 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 697 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 698 fatal("%s: receive fds failed", __func__); 699 700 /* Success */ 701 return (1); 702 } 703 704 void 705 mm_session_pty_cleanup2(Session *s) 706 { 707 Buffer m; 708 709 if (s->ttyfd == -1) 710 return; 711 buffer_init(&m); 712 buffer_put_cstring(&m, s->tty); 713 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 714 buffer_free(&m); 715 716 /* closed dup'ed master */ 717 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 718 error("close(s->ptymaster/%d): %s", 719 s->ptymaster, strerror(errno)); 720 721 /* unlink pty from session */ 722 s->ttyfd = -1; 723 } 724 725 /* Request process termination */ 726 727 void 728 mm_terminate(void) 729 { 730 Buffer m; 731 732 buffer_init(&m); 733 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 734 buffer_free(&m); 735 } 736 737 int 738 mm_ssh1_session_key(BIGNUM *num) 739 { 740 int rsafail; 741 Buffer m; 742 743 buffer_init(&m); 744 buffer_put_bignum2(&m, num); 745 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 746 747 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 748 749 rsafail = buffer_get_int(&m); 750 buffer_get_bignum2(&m, num); 751 752 buffer_free(&m); 753 754 return (rsafail); 755 } 756 757 static void 758 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 759 char ***prompts, u_int **echo_on) 760 { 761 *name = xstrdup(""); 762 *infotxt = xstrdup(""); 763 *numprompts = 1; 764 *prompts = xcalloc(*numprompts, sizeof(char *)); 765 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 766 (*echo_on)[0] = 0; 767 } 768 769 int 770 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 771 u_int *numprompts, char ***prompts, u_int **echo_on) 772 { 773 Buffer m; 774 u_int success; 775 char *challenge; 776 777 debug3("%s: entering", __func__); 778 779 buffer_init(&m); 780 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 781 782 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 783 &m); 784 success = buffer_get_int(&m); 785 if (success == 0) { 786 debug3("%s: no challenge", __func__); 787 buffer_free(&m); 788 return (-1); 789 } 790 791 /* Get the challenge, and format the response */ 792 challenge = buffer_get_string(&m, NULL); 793 buffer_free(&m); 794 795 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 796 (*prompts)[0] = challenge; 797 798 debug3("%s: received challenge: %s", __func__, challenge); 799 800 return (0); 801 } 802 803 int 804 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 805 { 806 Buffer m; 807 int authok; 808 809 debug3("%s: entering", __func__); 810 if (numresponses != 1) 811 return (-1); 812 813 buffer_init(&m); 814 buffer_put_cstring(&m, responses[0]); 815 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 816 817 mm_request_receive_expect(pmonitor->m_recvfd, 818 MONITOR_ANS_BSDAUTHRESPOND, &m); 819 820 authok = buffer_get_int(&m); 821 buffer_free(&m); 822 823 return ((authok == 0) ? -1 : 0); 824 } 825 826 827 void 828 mm_ssh1_session_id(u_char session_id[16]) 829 { 830 Buffer m; 831 int i; 832 833 debug3("%s entering", __func__); 834 835 buffer_init(&m); 836 for (i = 0; i < 16; i++) 837 buffer_put_char(&m, session_id[i]); 838 839 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 840 buffer_free(&m); 841 } 842 843 int 844 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 845 { 846 Buffer m; 847 Key *key; 848 u_char *blob; 849 u_int blen; 850 int allowed = 0, have_forced = 0; 851 852 debug3("%s entering", __func__); 853 854 buffer_init(&m); 855 buffer_put_bignum2(&m, client_n); 856 857 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 858 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 859 860 allowed = buffer_get_int(&m); 861 862 /* fake forced command */ 863 auth_clear_options(); 864 have_forced = buffer_get_int(&m); 865 forced_command = have_forced ? xstrdup("true") : NULL; 866 867 if (allowed && rkey != NULL) { 868 blob = buffer_get_string(&m, &blen); 869 if ((key = key_from_blob(blob, blen)) == NULL) 870 fatal("%s: key_from_blob failed", __func__); 871 *rkey = key; 872 xfree(blob); 873 } 874 mm_send_debug(&m); 875 buffer_free(&m); 876 877 return (allowed); 878 } 879 880 BIGNUM * 881 mm_auth_rsa_generate_challenge(Key *key) 882 { 883 Buffer m; 884 BIGNUM *challenge; 885 u_char *blob; 886 u_int blen; 887 888 debug3("%s entering", __func__); 889 890 if ((challenge = BN_new()) == NULL) 891 fatal("%s: BN_new failed", __func__); 892 893 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 894 if (key_to_blob(key, &blob, &blen) == 0) 895 fatal("%s: key_to_blob failed", __func__); 896 key->type = KEY_RSA1; 897 898 buffer_init(&m); 899 buffer_put_string(&m, blob, blen); 900 xfree(blob); 901 902 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 903 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 904 905 buffer_get_bignum2(&m, challenge); 906 buffer_free(&m); 907 908 return (challenge); 909 } 910 911 int 912 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 913 { 914 Buffer m; 915 u_char *blob; 916 u_int blen; 917 int success = 0; 918 919 debug3("%s entering", __func__); 920 921 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 922 if (key_to_blob(key, &blob, &blen) == 0) 923 fatal("%s: key_to_blob failed", __func__); 924 key->type = KEY_RSA1; 925 926 buffer_init(&m); 927 buffer_put_string(&m, blob, blen); 928 buffer_put_string(&m, response, 16); 929 xfree(blob); 930 931 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 932 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 933 934 success = buffer_get_int(&m); 935 buffer_free(&m); 936 937 return (success); 938 } 939 940 #ifdef GSSAPI 941 OM_uint32 942 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 943 { 944 Buffer m; 945 OM_uint32 major; 946 947 /* Client doesn't get to see the context */ 948 *ctx = NULL; 949 950 buffer_init(&m); 951 buffer_put_string(&m, goid->elements, goid->length); 952 953 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 954 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 955 956 major = buffer_get_int(&m); 957 958 buffer_free(&m); 959 return (major); 960 } 961 962 OM_uint32 963 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 964 gss_buffer_desc *out, OM_uint32 *flags) 965 { 966 Buffer m; 967 OM_uint32 major; 968 u_int len; 969 970 buffer_init(&m); 971 buffer_put_string(&m, in->value, in->length); 972 973 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 974 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 975 976 major = buffer_get_int(&m); 977 out->value = buffer_get_string(&m, &len); 978 out->length = len; 979 if (flags) 980 *flags = buffer_get_int(&m); 981 982 buffer_free(&m); 983 984 return (major); 985 } 986 987 OM_uint32 988 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 989 { 990 Buffer m; 991 OM_uint32 major; 992 993 buffer_init(&m); 994 buffer_put_string(&m, gssbuf->value, gssbuf->length); 995 buffer_put_string(&m, gssmic->value, gssmic->length); 996 997 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 998 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 999 &m); 1000 1001 major = buffer_get_int(&m); 1002 buffer_free(&m); 1003 return(major); 1004 } 1005 1006 int 1007 mm_ssh_gssapi_userok(char *user) 1008 { 1009 Buffer m; 1010 int authenticated = 0; 1011 1012 buffer_init(&m); 1013 1014 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1015 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1016 &m); 1017 1018 authenticated = buffer_get_int(&m); 1019 1020 buffer_free(&m); 1021 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1022 return (authenticated); 1023 } 1024 #endif /* GSSAPI */ 1025