1 /* $OpenBSD: monitor_wrap.c,v 1.65 2009/03/05 07:18:19 djm 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 #include <openssl/evp.h> 35 36 #include <errno.h> 37 #include <pwd.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "xmalloc.h" 44 #include "ssh.h" 45 #include "dh.h" 46 #include "buffer.h" 47 #include "key.h" 48 #include "cipher.h" 49 #include "kex.h" 50 #include "hostfile.h" 51 #include "auth.h" 52 #include "auth-options.h" 53 #include "packet.h" 54 #include "mac.h" 55 #include "log.h" 56 #include <zlib.h> 57 #include "monitor.h" 58 #ifdef GSSAPI 59 #include "ssh-gss.h" 60 #endif 61 #include "monitor_wrap.h" 62 #include "atomicio.h" 63 #include "monitor_fdpass.h" 64 #include "misc.h" 65 #include "schnorr.h" 66 #include "jpake.h" 67 68 #include "channels.h" 69 #include "session.h" 70 #include "servconf.h" 71 72 /* Imports */ 73 extern int compat20; 74 extern Newkeys *newkeys[]; 75 extern z_stream incoming_stream; 76 extern z_stream outgoing_stream; 77 extern struct monitor *pmonitor; 78 extern Buffer input, output; 79 extern Buffer loginmsg; 80 extern ServerOptions options; 81 82 int 83 mm_is_monitor(void) 84 { 85 /* 86 * m_pid is only set in the privileged part, and 87 * points to the unprivileged child. 88 */ 89 return (pmonitor && pmonitor->m_pid > 0); 90 } 91 92 void 93 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 94 { 95 u_int mlen = buffer_len(m); 96 u_char buf[5]; 97 98 debug3("%s entering: type %d", __func__, type); 99 100 put_u32(buf, mlen + 1); 101 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 102 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 103 fatal("%s: write: %s", __func__, strerror(errno)); 104 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 105 fatal("%s: write: %s", __func__, strerror(errno)); 106 } 107 108 void 109 mm_request_receive(int sock, Buffer *m) 110 { 111 u_char buf[4]; 112 u_int msg_len; 113 114 debug3("%s entering", __func__); 115 116 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 117 if (errno == EPIPE) 118 cleanup_exit(255); 119 fatal("%s: read: %s", __func__, strerror(errno)); 120 } 121 msg_len = get_u32(buf); 122 if (msg_len > 256 * 1024) 123 fatal("%s: read: bad msg_len %d", __func__, msg_len); 124 buffer_clear(m); 125 buffer_append_space(m, msg_len); 126 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 127 fatal("%s: read: %s", __func__, strerror(errno)); 128 } 129 130 void 131 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 132 { 133 u_char rtype; 134 135 debug3("%s entering: type %d", __func__, type); 136 137 mm_request_receive(sock, m); 138 rtype = buffer_get_char(m); 139 if (rtype != type) 140 fatal("%s: read: rtype %d != type %d", __func__, 141 rtype, type); 142 } 143 144 DH * 145 mm_choose_dh(int min, int nbits, int max) 146 { 147 BIGNUM *p, *g; 148 int success = 0; 149 Buffer m; 150 151 buffer_init(&m); 152 buffer_put_int(&m, min); 153 buffer_put_int(&m, nbits); 154 buffer_put_int(&m, max); 155 156 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 157 158 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 159 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 160 161 success = buffer_get_char(&m); 162 if (success == 0) 163 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 164 165 if ((p = BN_new()) == NULL) 166 fatal("%s: BN_new failed", __func__); 167 if ((g = BN_new()) == NULL) 168 fatal("%s: BN_new failed", __func__); 169 buffer_get_bignum2(&m, p); 170 buffer_get_bignum2(&m, g); 171 172 debug3("%s: remaining %d", __func__, buffer_len(&m)); 173 buffer_free(&m); 174 175 return (dh_new_group(g, p)); 176 } 177 178 int 179 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 180 { 181 Kex *kex = *pmonitor->m_pkex; 182 Buffer m; 183 184 debug3("%s entering", __func__); 185 186 buffer_init(&m); 187 buffer_put_int(&m, kex->host_key_index(key)); 188 buffer_put_string(&m, data, datalen); 189 190 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 191 192 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 193 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 194 *sigp = buffer_get_string(&m, lenp); 195 buffer_free(&m); 196 197 return (0); 198 } 199 200 struct passwd * 201 mm_getpwnamallow(const char *username) 202 { 203 Buffer m; 204 struct passwd *pw; 205 u_int len; 206 ServerOptions *newopts; 207 208 debug3("%s entering", __func__); 209 210 buffer_init(&m); 211 buffer_put_cstring(&m, username); 212 213 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 214 215 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 216 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 217 218 if (buffer_get_char(&m) == 0) { 219 pw = NULL; 220 goto out; 221 } 222 pw = buffer_get_string(&m, &len); 223 if (len != sizeof(struct passwd)) 224 fatal("%s: struct passwd size mismatch", __func__); 225 pw->pw_name = buffer_get_string(&m, NULL); 226 pw->pw_passwd = buffer_get_string(&m, NULL); 227 pw->pw_gecos = buffer_get_string(&m, NULL); 228 pw->pw_class = buffer_get_string(&m, NULL); 229 pw->pw_dir = buffer_get_string(&m, NULL); 230 pw->pw_shell = buffer_get_string(&m, NULL); 231 232 out: 233 /* copy options block as a Match directive may have changed some */ 234 newopts = buffer_get_string(&m, &len); 235 if (len != sizeof(*newopts)) 236 fatal("%s: option block size mismatch", __func__); 237 if (newopts->banner != NULL) 238 newopts->banner = buffer_get_string(&m, NULL); 239 copy_set_server_options(&options, newopts, 1); 240 xfree(newopts); 241 242 buffer_free(&m); 243 244 return (pw); 245 } 246 247 char * 248 mm_auth2_read_banner(void) 249 { 250 Buffer m; 251 char *banner; 252 253 debug3("%s entering", __func__); 254 255 buffer_init(&m); 256 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 257 buffer_clear(&m); 258 259 mm_request_receive_expect(pmonitor->m_recvfd, 260 MONITOR_ANS_AUTH2_READ_BANNER, &m); 261 banner = buffer_get_string(&m, NULL); 262 buffer_free(&m); 263 264 /* treat empty banner as missing banner */ 265 if (strlen(banner) == 0) { 266 xfree(banner); 267 banner = NULL; 268 } 269 return (banner); 270 } 271 272 /* Inform the privileged process about service and style */ 273 274 void 275 mm_inform_authserv(char *service, char *style) 276 { 277 Buffer m; 278 279 debug3("%s entering", __func__); 280 281 buffer_init(&m); 282 buffer_put_cstring(&m, service); 283 buffer_put_cstring(&m, style ? style : ""); 284 285 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 286 287 buffer_free(&m); 288 } 289 290 /* Do the password authentication */ 291 int 292 mm_auth_password(Authctxt *authctxt, char *password) 293 { 294 Buffer m; 295 int authenticated = 0; 296 297 debug3("%s entering", __func__); 298 299 buffer_init(&m); 300 buffer_put_cstring(&m, password); 301 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 302 303 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 304 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 305 306 authenticated = buffer_get_int(&m); 307 308 buffer_free(&m); 309 310 debug3("%s: user %sauthenticated", 311 __func__, authenticated ? "" : "not "); 312 return (authenticated); 313 } 314 315 int 316 mm_user_key_allowed(struct passwd *pw, Key *key) 317 { 318 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 319 } 320 321 int 322 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 323 Key *key) 324 { 325 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 326 } 327 328 int 329 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 330 char *host, Key *key) 331 { 332 int ret; 333 334 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 335 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 336 key->type = KEY_RSA1; 337 return (ret); 338 } 339 340 static void 341 mm_send_debug(Buffer *m) 342 { 343 char *msg; 344 345 while (buffer_len(m)) { 346 msg = buffer_get_string(m, NULL); 347 debug3("%s: Sending debug: %s", __func__, msg); 348 packet_send_debug("%s", msg); 349 xfree(msg); 350 } 351 } 352 353 int 354 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 355 { 356 Buffer m; 357 u_char *blob; 358 u_int len; 359 int allowed = 0, have_forced = 0; 360 361 debug3("%s entering", __func__); 362 363 /* Convert the key to a blob and the pass it over */ 364 if (!key_to_blob(key, &blob, &len)) 365 return (0); 366 367 buffer_init(&m); 368 buffer_put_int(&m, type); 369 buffer_put_cstring(&m, user ? user : ""); 370 buffer_put_cstring(&m, host ? host : ""); 371 buffer_put_string(&m, blob, len); 372 xfree(blob); 373 374 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 375 376 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 377 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 378 379 allowed = buffer_get_int(&m); 380 381 /* fake forced command */ 382 auth_clear_options(); 383 have_forced = buffer_get_int(&m); 384 forced_command = have_forced ? xstrdup("true") : NULL; 385 386 /* Send potential debug messages */ 387 mm_send_debug(&m); 388 389 buffer_free(&m); 390 391 return (allowed); 392 } 393 394 /* 395 * This key verify needs to send the key type along, because the 396 * privileged parent makes the decision if the key is allowed 397 * for authentication. 398 */ 399 400 int 401 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 402 { 403 Buffer m; 404 u_char *blob; 405 u_int len; 406 int verified = 0; 407 408 debug3("%s entering", __func__); 409 410 /* Convert the key to a blob and the pass it over */ 411 if (!key_to_blob(key, &blob, &len)) 412 return (0); 413 414 buffer_init(&m); 415 buffer_put_string(&m, blob, len); 416 buffer_put_string(&m, sig, siglen); 417 buffer_put_string(&m, data, datalen); 418 xfree(blob); 419 420 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 421 422 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 423 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 424 425 verified = buffer_get_int(&m); 426 427 buffer_free(&m); 428 429 return (verified); 430 } 431 432 /* Export key state after authentication */ 433 Newkeys * 434 mm_newkeys_from_blob(u_char *blob, int blen) 435 { 436 Buffer b; 437 u_int len; 438 Newkeys *newkey = NULL; 439 Enc *enc; 440 Mac *mac; 441 Comp *comp; 442 443 debug3("%s: %p(%d)", __func__, blob, blen); 444 #ifdef DEBUG_PK 445 dump_base64(stderr, blob, blen); 446 #endif 447 buffer_init(&b); 448 buffer_append(&b, blob, blen); 449 450 newkey = xmalloc(sizeof(*newkey)); 451 enc = &newkey->enc; 452 mac = &newkey->mac; 453 comp = &newkey->comp; 454 455 /* Enc structure */ 456 enc->name = buffer_get_string(&b, NULL); 457 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 458 enc->enabled = buffer_get_int(&b); 459 enc->block_size = buffer_get_int(&b); 460 enc->key = buffer_get_string(&b, &enc->key_len); 461 enc->iv = buffer_get_string(&b, &len); 462 if (len != enc->block_size) 463 fatal("%s: bad ivlen: expected %u != %u", __func__, 464 enc->block_size, len); 465 466 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 467 fatal("%s: bad cipher name %s or pointer %p", __func__, 468 enc->name, enc->cipher); 469 470 /* Mac structure */ 471 mac->name = buffer_get_string(&b, NULL); 472 if (mac->name == NULL || mac_setup(mac, mac->name) == -1) 473 fatal("%s: can not setup mac %s", __func__, mac->name); 474 mac->enabled = buffer_get_int(&b); 475 mac->key = buffer_get_string(&b, &len); 476 if (len > mac->key_len) 477 fatal("%s: bad mac key length: %u > %d", __func__, len, 478 mac->key_len); 479 mac->key_len = len; 480 481 /* Comp structure */ 482 comp->type = buffer_get_int(&b); 483 comp->enabled = buffer_get_int(&b); 484 comp->name = buffer_get_string(&b, NULL); 485 486 len = buffer_len(&b); 487 if (len != 0) 488 error("newkeys_from_blob: remaining bytes in blob %u", len); 489 buffer_free(&b); 490 return (newkey); 491 } 492 493 int 494 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 495 { 496 Buffer b; 497 int len; 498 Enc *enc; 499 Mac *mac; 500 Comp *comp; 501 Newkeys *newkey = newkeys[mode]; 502 503 debug3("%s: converting %p", __func__, newkey); 504 505 if (newkey == NULL) { 506 error("%s: newkey == NULL", __func__); 507 return 0; 508 } 509 enc = &newkey->enc; 510 mac = &newkey->mac; 511 comp = &newkey->comp; 512 513 buffer_init(&b); 514 /* Enc structure */ 515 buffer_put_cstring(&b, enc->name); 516 /* The cipher struct is constant and shared, you export pointer */ 517 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 518 buffer_put_int(&b, enc->enabled); 519 buffer_put_int(&b, enc->block_size); 520 buffer_put_string(&b, enc->key, enc->key_len); 521 packet_get_keyiv(mode, enc->iv, enc->block_size); 522 buffer_put_string(&b, enc->iv, enc->block_size); 523 524 /* Mac structure */ 525 buffer_put_cstring(&b, mac->name); 526 buffer_put_int(&b, mac->enabled); 527 buffer_put_string(&b, mac->key, mac->key_len); 528 529 /* Comp structure */ 530 buffer_put_int(&b, comp->type); 531 buffer_put_int(&b, comp->enabled); 532 buffer_put_cstring(&b, comp->name); 533 534 len = buffer_len(&b); 535 if (lenp != NULL) 536 *lenp = len; 537 if (blobp != NULL) { 538 *blobp = xmalloc(len); 539 memcpy(*blobp, buffer_ptr(&b), len); 540 } 541 memset(buffer_ptr(&b), 0, len); 542 buffer_free(&b); 543 return len; 544 } 545 546 static void 547 mm_send_kex(Buffer *m, Kex *kex) 548 { 549 buffer_put_string(m, kex->session_id, kex->session_id_len); 550 buffer_put_int(m, kex->we_need); 551 buffer_put_int(m, kex->hostkey_type); 552 buffer_put_int(m, kex->kex_type); 553 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 554 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 555 buffer_put_int(m, kex->flags); 556 buffer_put_cstring(m, kex->client_version_string); 557 buffer_put_cstring(m, kex->server_version_string); 558 } 559 560 void 561 mm_send_keystate(struct monitor *monitor) 562 { 563 Buffer m; 564 u_char *blob, *p; 565 u_int bloblen, plen; 566 u_int32_t seqnr, packets; 567 u_int64_t blocks, bytes; 568 569 buffer_init(&m); 570 571 if (!compat20) { 572 u_char iv[24]; 573 u_char *key; 574 u_int ivlen, keylen; 575 576 buffer_put_int(&m, packet_get_protocol_flags()); 577 578 buffer_put_int(&m, packet_get_ssh1_cipher()); 579 580 debug3("%s: Sending ssh1 KEY+IV", __func__); 581 keylen = packet_get_encryption_key(NULL); 582 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 583 keylen = packet_get_encryption_key(key); 584 buffer_put_string(&m, key, keylen); 585 memset(key, 0, keylen); 586 xfree(key); 587 588 ivlen = packet_get_keyiv_len(MODE_OUT); 589 packet_get_keyiv(MODE_OUT, iv, ivlen); 590 buffer_put_string(&m, iv, ivlen); 591 ivlen = packet_get_keyiv_len(MODE_OUT); 592 packet_get_keyiv(MODE_IN, iv, ivlen); 593 buffer_put_string(&m, iv, ivlen); 594 goto skip; 595 } else { 596 /* Kex for rekeying */ 597 mm_send_kex(&m, *monitor->m_pkex); 598 } 599 600 debug3("%s: Sending new keys: %p %p", 601 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 602 603 /* Keys from Kex */ 604 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 605 fatal("%s: conversion of newkeys failed", __func__); 606 607 buffer_put_string(&m, blob, bloblen); 608 xfree(blob); 609 610 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 611 fatal("%s: conversion of newkeys failed", __func__); 612 613 buffer_put_string(&m, blob, bloblen); 614 xfree(blob); 615 616 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); 617 buffer_put_int(&m, seqnr); 618 buffer_put_int64(&m, blocks); 619 buffer_put_int(&m, packets); 620 buffer_put_int64(&m, bytes); 621 packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); 622 buffer_put_int(&m, seqnr); 623 buffer_put_int64(&m, blocks); 624 buffer_put_int(&m, packets); 625 buffer_put_int64(&m, bytes); 626 627 debug3("%s: New keys have been sent", __func__); 628 skip: 629 /* More key context */ 630 plen = packet_get_keycontext(MODE_OUT, NULL); 631 p = xmalloc(plen+1); 632 packet_get_keycontext(MODE_OUT, p); 633 buffer_put_string(&m, p, plen); 634 xfree(p); 635 636 plen = packet_get_keycontext(MODE_IN, NULL); 637 p = xmalloc(plen+1); 638 packet_get_keycontext(MODE_IN, p); 639 buffer_put_string(&m, p, plen); 640 xfree(p); 641 642 /* Compression state */ 643 debug3("%s: Sending compression state", __func__); 644 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 645 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 646 647 /* Network I/O buffers */ 648 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 649 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 650 651 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 652 debug3("%s: Finished sending state", __func__); 653 654 buffer_free(&m); 655 } 656 657 int 658 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 659 { 660 Buffer m; 661 char *p, *msg; 662 int success = 0, tmp1 = -1, tmp2 = -1; 663 664 /* Kludge: ensure there are fds free to receive the pty/tty */ 665 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 666 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 667 error("%s: cannot allocate fds for pty", __func__); 668 if (tmp1 > 0) 669 close(tmp1); 670 if (tmp2 > 0) 671 close(tmp2); 672 return 0; 673 } 674 close(tmp1); 675 close(tmp2); 676 677 buffer_init(&m); 678 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 679 680 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 681 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 682 683 success = buffer_get_int(&m); 684 if (success == 0) { 685 debug3("%s: pty alloc failed", __func__); 686 buffer_free(&m); 687 return (0); 688 } 689 p = buffer_get_string(&m, NULL); 690 msg = buffer_get_string(&m, NULL); 691 buffer_free(&m); 692 693 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 694 xfree(p); 695 696 buffer_append(&loginmsg, msg, strlen(msg)); 697 xfree(msg); 698 699 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 700 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 701 fatal("%s: receive fds failed", __func__); 702 703 /* Success */ 704 return (1); 705 } 706 707 void 708 mm_session_pty_cleanup2(Session *s) 709 { 710 Buffer m; 711 712 if (s->ttyfd == -1) 713 return; 714 buffer_init(&m); 715 buffer_put_cstring(&m, s->tty); 716 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 717 buffer_free(&m); 718 719 /* closed dup'ed master */ 720 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 721 error("close(s->ptymaster/%d): %s", 722 s->ptymaster, strerror(errno)); 723 724 /* unlink pty from session */ 725 s->ttyfd = -1; 726 } 727 728 /* Request process termination */ 729 730 void 731 mm_terminate(void) 732 { 733 Buffer m; 734 735 buffer_init(&m); 736 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 737 buffer_free(&m); 738 } 739 740 int 741 mm_ssh1_session_key(BIGNUM *num) 742 { 743 int rsafail; 744 Buffer m; 745 746 buffer_init(&m); 747 buffer_put_bignum2(&m, num); 748 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 749 750 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 751 752 rsafail = buffer_get_int(&m); 753 buffer_get_bignum2(&m, num); 754 755 buffer_free(&m); 756 757 return (rsafail); 758 } 759 760 static void 761 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 762 char ***prompts, u_int **echo_on) 763 { 764 *name = xstrdup(""); 765 *infotxt = xstrdup(""); 766 *numprompts = 1; 767 *prompts = xcalloc(*numprompts, sizeof(char *)); 768 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 769 (*echo_on)[0] = 0; 770 } 771 772 int 773 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 774 u_int *numprompts, char ***prompts, u_int **echo_on) 775 { 776 Buffer m; 777 u_int success; 778 char *challenge; 779 780 debug3("%s: entering", __func__); 781 782 buffer_init(&m); 783 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 784 785 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 786 &m); 787 success = buffer_get_int(&m); 788 if (success == 0) { 789 debug3("%s: no challenge", __func__); 790 buffer_free(&m); 791 return (-1); 792 } 793 794 /* Get the challenge, and format the response */ 795 challenge = buffer_get_string(&m, NULL); 796 buffer_free(&m); 797 798 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 799 (*prompts)[0] = challenge; 800 801 debug3("%s: received challenge: %s", __func__, challenge); 802 803 return (0); 804 } 805 806 int 807 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 808 { 809 Buffer m; 810 int authok; 811 812 debug3("%s: entering", __func__); 813 if (numresponses != 1) 814 return (-1); 815 816 buffer_init(&m); 817 buffer_put_cstring(&m, responses[0]); 818 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 819 820 mm_request_receive_expect(pmonitor->m_recvfd, 821 MONITOR_ANS_BSDAUTHRESPOND, &m); 822 823 authok = buffer_get_int(&m); 824 buffer_free(&m); 825 826 return ((authok == 0) ? -1 : 0); 827 } 828 829 830 void 831 mm_ssh1_session_id(u_char session_id[16]) 832 { 833 Buffer m; 834 int i; 835 836 debug3("%s entering", __func__); 837 838 buffer_init(&m); 839 for (i = 0; i < 16; i++) 840 buffer_put_char(&m, session_id[i]); 841 842 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 843 buffer_free(&m); 844 } 845 846 int 847 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 848 { 849 Buffer m; 850 Key *key; 851 u_char *blob; 852 u_int blen; 853 int allowed = 0, have_forced = 0; 854 855 debug3("%s entering", __func__); 856 857 buffer_init(&m); 858 buffer_put_bignum2(&m, client_n); 859 860 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 861 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 862 863 allowed = buffer_get_int(&m); 864 865 /* fake forced command */ 866 auth_clear_options(); 867 have_forced = buffer_get_int(&m); 868 forced_command = have_forced ? xstrdup("true") : NULL; 869 870 if (allowed && rkey != NULL) { 871 blob = buffer_get_string(&m, &blen); 872 if ((key = key_from_blob(blob, blen)) == NULL) 873 fatal("%s: key_from_blob failed", __func__); 874 *rkey = key; 875 xfree(blob); 876 } 877 mm_send_debug(&m); 878 buffer_free(&m); 879 880 return (allowed); 881 } 882 883 BIGNUM * 884 mm_auth_rsa_generate_challenge(Key *key) 885 { 886 Buffer m; 887 BIGNUM *challenge; 888 u_char *blob; 889 u_int blen; 890 891 debug3("%s entering", __func__); 892 893 if ((challenge = BN_new()) == NULL) 894 fatal("%s: BN_new failed", __func__); 895 896 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 897 if (key_to_blob(key, &blob, &blen) == 0) 898 fatal("%s: key_to_blob failed", __func__); 899 key->type = KEY_RSA1; 900 901 buffer_init(&m); 902 buffer_put_string(&m, blob, blen); 903 xfree(blob); 904 905 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 906 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 907 908 buffer_get_bignum2(&m, challenge); 909 buffer_free(&m); 910 911 return (challenge); 912 } 913 914 int 915 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 916 { 917 Buffer m; 918 u_char *blob; 919 u_int blen; 920 int success = 0; 921 922 debug3("%s entering", __func__); 923 924 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 925 if (key_to_blob(key, &blob, &blen) == 0) 926 fatal("%s: key_to_blob failed", __func__); 927 key->type = KEY_RSA1; 928 929 buffer_init(&m); 930 buffer_put_string(&m, blob, blen); 931 buffer_put_string(&m, response, 16); 932 xfree(blob); 933 934 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 935 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 936 937 success = buffer_get_int(&m); 938 buffer_free(&m); 939 940 return (success); 941 } 942 943 #ifdef GSSAPI 944 OM_uint32 945 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 946 { 947 Buffer m; 948 OM_uint32 major; 949 950 /* Client doesn't get to see the context */ 951 *ctx = NULL; 952 953 buffer_init(&m); 954 buffer_put_string(&m, goid->elements, goid->length); 955 956 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 957 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 958 959 major = buffer_get_int(&m); 960 961 buffer_free(&m); 962 return (major); 963 } 964 965 OM_uint32 966 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 967 gss_buffer_desc *out, OM_uint32 *flags) 968 { 969 Buffer m; 970 OM_uint32 major; 971 u_int len; 972 973 buffer_init(&m); 974 buffer_put_string(&m, in->value, in->length); 975 976 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 977 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 978 979 major = buffer_get_int(&m); 980 out->value = buffer_get_string(&m, &len); 981 out->length = len; 982 if (flags) 983 *flags = buffer_get_int(&m); 984 985 buffer_free(&m); 986 987 return (major); 988 } 989 990 OM_uint32 991 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 992 { 993 Buffer m; 994 OM_uint32 major; 995 996 buffer_init(&m); 997 buffer_put_string(&m, gssbuf->value, gssbuf->length); 998 buffer_put_string(&m, gssmic->value, gssmic->length); 999 1000 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 1001 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 1002 &m); 1003 1004 major = buffer_get_int(&m); 1005 buffer_free(&m); 1006 return(major); 1007 } 1008 1009 int 1010 mm_ssh_gssapi_userok(char *user) 1011 { 1012 Buffer m; 1013 int authenticated = 0; 1014 1015 buffer_init(&m); 1016 1017 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1018 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1019 &m); 1020 1021 authenticated = buffer_get_int(&m); 1022 1023 buffer_free(&m); 1024 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1025 return (authenticated); 1026 } 1027 #endif /* GSSAPI */ 1028 1029 #ifdef JPAKE 1030 void 1031 mm_auth2_jpake_get_pwdata(Authctxt *authctxt, BIGNUM **s, 1032 char **hash_scheme, char **salt) 1033 { 1034 Buffer m; 1035 1036 debug3("%s entering", __func__); 1037 1038 buffer_init(&m); 1039 mm_request_send(pmonitor->m_recvfd, 1040 MONITOR_REQ_JPAKE_GET_PWDATA, &m); 1041 1042 debug3("%s: waiting for MONITOR_ANS_JPAKE_GET_PWDATA", __func__); 1043 mm_request_receive_expect(pmonitor->m_recvfd, 1044 MONITOR_ANS_JPAKE_GET_PWDATA, &m); 1045 1046 *hash_scheme = buffer_get_string(&m, NULL); 1047 *salt = buffer_get_string(&m, NULL); 1048 1049 buffer_free(&m); 1050 } 1051 1052 void 1053 mm_jpake_step1(struct modp_group *grp, 1054 u_char **id, u_int *id_len, 1055 BIGNUM **priv1, BIGNUM **priv2, BIGNUM **g_priv1, BIGNUM **g_priv2, 1056 u_char **priv1_proof, u_int *priv1_proof_len, 1057 u_char **priv2_proof, u_int *priv2_proof_len) 1058 { 1059 Buffer m; 1060 1061 debug3("%s entering", __func__); 1062 1063 buffer_init(&m); 1064 mm_request_send(pmonitor->m_recvfd, 1065 MONITOR_REQ_JPAKE_STEP1, &m); 1066 1067 debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP1", __func__); 1068 mm_request_receive_expect(pmonitor->m_recvfd, 1069 MONITOR_ANS_JPAKE_STEP1, &m); 1070 1071 if ((*priv1 = BN_new()) == NULL || 1072 (*priv2 = BN_new()) == NULL || 1073 (*g_priv1 = BN_new()) == NULL || 1074 (*g_priv2 = BN_new()) == NULL) 1075 fatal("%s: BN_new", __func__); 1076 1077 *id = buffer_get_string(&m, id_len); 1078 /* priv1 and priv2 are, well, private */ 1079 buffer_get_bignum2(&m, *g_priv1); 1080 buffer_get_bignum2(&m, *g_priv2); 1081 *priv1_proof = buffer_get_string(&m, priv1_proof_len); 1082 *priv2_proof = buffer_get_string(&m, priv2_proof_len); 1083 1084 buffer_free(&m); 1085 } 1086 1087 void 1088 mm_jpake_step2(struct modp_group *grp, BIGNUM *s, 1089 BIGNUM *mypub1, BIGNUM *theirpub1, BIGNUM *theirpub2, BIGNUM *mypriv2, 1090 const u_char *theirid, u_int theirid_len, 1091 const u_char *myid, u_int myid_len, 1092 const u_char *theirpub1_proof, u_int theirpub1_proof_len, 1093 const u_char *theirpub2_proof, u_int theirpub2_proof_len, 1094 BIGNUM **newpub, 1095 u_char **newpub_exponent_proof, u_int *newpub_exponent_proof_len) 1096 { 1097 Buffer m; 1098 1099 debug3("%s entering", __func__); 1100 1101 buffer_init(&m); 1102 /* monitor already has all bignums except theirpub1, theirpub2 */ 1103 buffer_put_bignum2(&m, theirpub1); 1104 buffer_put_bignum2(&m, theirpub2); 1105 /* monitor already knows our id */ 1106 buffer_put_string(&m, theirid, theirid_len); 1107 buffer_put_string(&m, theirpub1_proof, theirpub1_proof_len); 1108 buffer_put_string(&m, theirpub2_proof, theirpub2_proof_len); 1109 1110 mm_request_send(pmonitor->m_recvfd, 1111 MONITOR_REQ_JPAKE_STEP2, &m); 1112 1113 debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP2", __func__); 1114 mm_request_receive_expect(pmonitor->m_recvfd, 1115 MONITOR_ANS_JPAKE_STEP2, &m); 1116 1117 if ((*newpub = BN_new()) == NULL) 1118 fatal("%s: BN_new", __func__); 1119 1120 buffer_get_bignum2(&m, *newpub); 1121 *newpub_exponent_proof = buffer_get_string(&m, 1122 newpub_exponent_proof_len); 1123 1124 buffer_free(&m); 1125 } 1126 1127 void 1128 mm_jpake_key_confirm(struct modp_group *grp, BIGNUM *s, BIGNUM *step2_val, 1129 BIGNUM *mypriv2, BIGNUM *mypub1, BIGNUM *mypub2, 1130 BIGNUM *theirpub1, BIGNUM *theirpub2, 1131 const u_char *my_id, u_int my_id_len, 1132 const u_char *their_id, u_int their_id_len, 1133 const u_char *sess_id, u_int sess_id_len, 1134 const u_char *theirpriv2_s_proof, u_int theirpriv2_s_proof_len, 1135 BIGNUM **k, 1136 u_char **confirm_hash, u_int *confirm_hash_len) 1137 { 1138 Buffer m; 1139 1140 debug3("%s entering", __func__); 1141 1142 buffer_init(&m); 1143 /* monitor already has all bignums except step2_val */ 1144 buffer_put_bignum2(&m, step2_val); 1145 /* monitor already knows all the ids */ 1146 buffer_put_string(&m, theirpriv2_s_proof, theirpriv2_s_proof_len); 1147 1148 mm_request_send(pmonitor->m_recvfd, 1149 MONITOR_REQ_JPAKE_KEY_CONFIRM, &m); 1150 1151 debug3("%s: waiting for MONITOR_ANS_JPAKE_KEY_CONFIRM", __func__); 1152 mm_request_receive_expect(pmonitor->m_recvfd, 1153 MONITOR_ANS_JPAKE_KEY_CONFIRM, &m); 1154 1155 /* 'k' is sensitive and stays in the monitor */ 1156 *confirm_hash = buffer_get_string(&m, confirm_hash_len); 1157 1158 buffer_free(&m); 1159 } 1160 1161 int 1162 mm_jpake_check_confirm(const BIGNUM *k, 1163 const u_char *peer_id, u_int peer_id_len, 1164 const u_char *sess_id, u_int sess_id_len, 1165 const u_char *peer_confirm_hash, u_int peer_confirm_hash_len) 1166 { 1167 Buffer m; 1168 int success = 0; 1169 1170 debug3("%s entering", __func__); 1171 1172 buffer_init(&m); 1173 /* k is dummy in slave, ignored */ 1174 /* monitor knows all the ids */ 1175 buffer_put_string(&m, peer_confirm_hash, peer_confirm_hash_len); 1176 mm_request_send(pmonitor->m_recvfd, 1177 MONITOR_REQ_JPAKE_CHECK_CONFIRM, &m); 1178 1179 debug3("%s: waiting for MONITOR_ANS_JPAKE_CHECK_CONFIRM", __func__); 1180 mm_request_receive_expect(pmonitor->m_recvfd, 1181 MONITOR_ANS_JPAKE_CHECK_CONFIRM, &m); 1182 1183 success = buffer_get_int(&m); 1184 buffer_free(&m); 1185 1186 debug3("%s: success = %d", __func__, success); 1187 return success; 1188 } 1189 #endif /* JPAKE */ 1190