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 1.28 2003/07/22 13:35:22 markus Exp $"); 29 30 #include <openssl/bn.h> 31 #include <openssl/dh.h> 32 33 #include "ssh.h" 34 #include "dh.h" 35 #include "kex.h" 36 #include "auth.h" 37 #include "auth-options.h" 38 #include "buffer.h" 39 #include "bufaux.h" 40 #include "packet.h" 41 #include "mac.h" 42 #include "log.h" 43 #include "zlib.h" 44 #include "monitor.h" 45 #include "monitor_wrap.h" 46 #include "xmalloc.h" 47 #include "atomicio.h" 48 #include "monitor_fdpass.h" 49 #include "getput.h" 50 51 #include "auth.h" 52 #include "channels.h" 53 #include "session.h" 54 55 /* Imports */ 56 extern int compat20; 57 extern Newkeys *newkeys[]; 58 extern z_stream incoming_stream; 59 extern z_stream outgoing_stream; 60 extern struct monitor *pmonitor; 61 extern Buffer input, output; 62 63 void 64 mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) 65 { 66 u_int mlen = buffer_len(m); 67 u_char buf[5]; 68 69 debug3("%s entering: type %d", __func__, type); 70 71 PUT_32BIT(buf, mlen + 1); 72 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 73 if (atomicio(vwrite, socket, buf, sizeof(buf)) != sizeof(buf)) 74 fatal("%s: write", __func__); 75 if (atomicio(vwrite, socket, buffer_ptr(m), mlen) != mlen) 76 fatal("%s: write", __func__); 77 } 78 79 void 80 mm_request_receive(int socket, Buffer *m) 81 { 82 u_char buf[4]; 83 u_int msg_len; 84 ssize_t res; 85 86 debug3("%s entering", __func__); 87 88 res = atomicio(read, socket, buf, sizeof(buf)); 89 if (res != sizeof(buf)) { 90 if (res == 0) 91 fatal_cleanup(); 92 fatal("%s: read: %ld", __func__, (long)res); 93 } 94 msg_len = GET_32BIT(buf); 95 if (msg_len > 256 * 1024) 96 fatal("%s: read: bad msg_len %d", __func__, msg_len); 97 buffer_clear(m); 98 buffer_append_space(m, msg_len); 99 res = atomicio(read, socket, buffer_ptr(m), msg_len); 100 if (res != msg_len) 101 fatal("%s: read: %ld != msg_len", __func__, (long)res); 102 } 103 104 void 105 mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m) 106 { 107 u_char rtype; 108 109 debug3("%s entering: type %d", __func__, type); 110 111 mm_request_receive(socket, m); 112 rtype = buffer_get_char(m); 113 if (rtype != type) 114 fatal("%s: read: rtype %d != type %d", __func__, 115 rtype, type); 116 } 117 118 DH * 119 mm_choose_dh(int min, int nbits, int max) 120 { 121 BIGNUM *p, *g; 122 int success = 0; 123 Buffer m; 124 125 buffer_init(&m); 126 buffer_put_int(&m, min); 127 buffer_put_int(&m, nbits); 128 buffer_put_int(&m, max); 129 130 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 131 132 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 133 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 134 135 success = buffer_get_char(&m); 136 if (success == 0) 137 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 138 139 if ((p = BN_new()) == NULL) 140 fatal("%s: BN_new failed", __func__); 141 if ((g = BN_new()) == NULL) 142 fatal("%s: BN_new failed", __func__); 143 buffer_get_bignum2(&m, p); 144 buffer_get_bignum2(&m, g); 145 146 debug3("%s: remaining %d", __func__, buffer_len(&m)); 147 buffer_free(&m); 148 149 return (dh_new_group(g, p)); 150 } 151 152 int 153 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 154 { 155 Kex *kex = *pmonitor->m_pkex; 156 Buffer m; 157 158 debug3("%s entering", __func__); 159 160 buffer_init(&m); 161 buffer_put_int(&m, kex->host_key_index(key)); 162 buffer_put_string(&m, data, datalen); 163 164 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 165 166 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 167 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 168 *sigp = buffer_get_string(&m, lenp); 169 buffer_free(&m); 170 171 return (0); 172 } 173 174 struct passwd * 175 mm_getpwnamallow(const char *login) 176 { 177 Buffer m; 178 struct passwd *pw; 179 u_int pwlen; 180 181 debug3("%s entering", __func__); 182 183 buffer_init(&m); 184 buffer_put_cstring(&m, login); 185 186 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 187 188 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 189 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 190 191 if (buffer_get_char(&m) == 0) { 192 buffer_free(&m); 193 return (NULL); 194 } 195 pw = buffer_get_string(&m, &pwlen); 196 if (pwlen != sizeof(struct passwd)) 197 fatal("%s: struct passwd size mismatch", __func__); 198 pw->pw_name = buffer_get_string(&m, NULL); 199 pw->pw_passwd = buffer_get_string(&m, NULL); 200 pw->pw_gecos = buffer_get_string(&m, NULL); 201 pw->pw_class = buffer_get_string(&m, NULL); 202 pw->pw_dir = buffer_get_string(&m, NULL); 203 pw->pw_shell = buffer_get_string(&m, NULL); 204 buffer_free(&m); 205 206 return (pw); 207 } 208 209 char *mm_auth2_read_banner(void) 210 { 211 Buffer m; 212 char *banner; 213 214 debug3("%s entering", __func__); 215 216 buffer_init(&m); 217 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 218 buffer_clear(&m); 219 220 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m); 221 banner = buffer_get_string(&m, NULL); 222 buffer_free(&m); 223 224 return (banner); 225 } 226 227 /* Inform the privileged process about service and style */ 228 229 void 230 mm_inform_authserv(char *service, char *style) 231 { 232 Buffer m; 233 234 debug3("%s entering", __func__); 235 236 buffer_init(&m); 237 buffer_put_cstring(&m, service); 238 buffer_put_cstring(&m, style ? style : ""); 239 240 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 241 242 buffer_free(&m); 243 } 244 245 /* Do the password authentication */ 246 int 247 mm_auth_password(Authctxt *authctxt, char *password) 248 { 249 Buffer m; 250 int authenticated = 0; 251 252 debug3("%s entering", __func__); 253 254 buffer_init(&m); 255 buffer_put_cstring(&m, password); 256 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 257 258 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 259 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 260 261 authenticated = buffer_get_int(&m); 262 263 buffer_free(&m); 264 265 debug3("%s: user %sauthenticated", 266 __func__, authenticated ? "" : "not "); 267 return (authenticated); 268 } 269 270 int 271 mm_user_key_allowed(struct passwd *pw, Key *key) 272 { 273 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 274 } 275 276 int 277 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 278 Key *key) 279 { 280 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 281 } 282 283 int 284 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 285 char *host, Key *key) 286 { 287 int ret; 288 289 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 290 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 291 key->type = KEY_RSA1; 292 return (ret); 293 } 294 295 static void 296 mm_send_debug(Buffer *m) 297 { 298 char *msg; 299 300 while (buffer_len(m)) { 301 msg = buffer_get_string(m, NULL); 302 debug3("%s: Sending debug: %s", __func__, msg); 303 packet_send_debug("%s", msg); 304 xfree(msg); 305 } 306 } 307 308 int 309 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 310 { 311 Buffer m; 312 u_char *blob; 313 u_int len; 314 int allowed = 0, have_forced = 0; 315 316 debug3("%s entering", __func__); 317 318 /* Convert the key to a blob and the pass it over */ 319 if (!key_to_blob(key, &blob, &len)) 320 return (0); 321 322 buffer_init(&m); 323 buffer_put_int(&m, type); 324 buffer_put_cstring(&m, user ? user : ""); 325 buffer_put_cstring(&m, host ? host : ""); 326 buffer_put_string(&m, blob, len); 327 xfree(blob); 328 329 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 330 331 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 332 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 333 334 allowed = buffer_get_int(&m); 335 336 /* fake forced command */ 337 auth_clear_options(); 338 have_forced = buffer_get_int(&m); 339 forced_command = have_forced ? xstrdup("true") : NULL; 340 341 /* Send potential debug messages */ 342 mm_send_debug(&m); 343 344 buffer_free(&m); 345 346 return (allowed); 347 } 348 349 /* 350 * This key verify needs to send the key type along, because the 351 * privileged parent makes the decision if the key is allowed 352 * for authentication. 353 */ 354 355 int 356 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 357 { 358 Buffer m; 359 u_char *blob; 360 u_int len; 361 int verified = 0; 362 363 debug3("%s entering", __func__); 364 365 /* Convert the key to a blob and the pass it over */ 366 if (!key_to_blob(key, &blob, &len)) 367 return (0); 368 369 buffer_init(&m); 370 buffer_put_string(&m, blob, len); 371 buffer_put_string(&m, sig, siglen); 372 buffer_put_string(&m, data, datalen); 373 xfree(blob); 374 375 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 376 377 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 378 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 379 380 verified = buffer_get_int(&m); 381 382 buffer_free(&m); 383 384 return (verified); 385 } 386 387 /* Export key state after authentication */ 388 Newkeys * 389 mm_newkeys_from_blob(u_char *blob, int blen) 390 { 391 Buffer b; 392 u_int len; 393 Newkeys *newkey = NULL; 394 Enc *enc; 395 Mac *mac; 396 Comp *comp; 397 398 debug3("%s: %p(%d)", __func__, blob, blen); 399 #ifdef DEBUG_PK 400 dump_base64(stderr, blob, blen); 401 #endif 402 buffer_init(&b); 403 buffer_append(&b, blob, blen); 404 405 newkey = xmalloc(sizeof(*newkey)); 406 enc = &newkey->enc; 407 mac = &newkey->mac; 408 comp = &newkey->comp; 409 410 /* Enc structure */ 411 enc->name = buffer_get_string(&b, NULL); 412 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 413 enc->enabled = buffer_get_int(&b); 414 enc->block_size = buffer_get_int(&b); 415 enc->key = buffer_get_string(&b, &enc->key_len); 416 enc->iv = buffer_get_string(&b, &len); 417 if (len != enc->block_size) 418 fatal("%s: bad ivlen: expected %u != %u", __func__, 419 enc->block_size, len); 420 421 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 422 fatal("%s: bad cipher name %s or pointer %p", __func__, 423 enc->name, enc->cipher); 424 425 /* Mac structure */ 426 mac->name = buffer_get_string(&b, NULL); 427 if (mac->name == NULL || mac_init(mac, mac->name) == -1) 428 fatal("%s: can not init mac %s", __func__, mac->name); 429 mac->enabled = buffer_get_int(&b); 430 mac->key = buffer_get_string(&b, &len); 431 if (len > mac->key_len) 432 fatal("%s: bad mac key length: %u > %d", __func__, len, 433 mac->key_len); 434 mac->key_len = len; 435 436 /* Comp structure */ 437 comp->type = buffer_get_int(&b); 438 comp->enabled = buffer_get_int(&b); 439 comp->name = buffer_get_string(&b, NULL); 440 441 len = buffer_len(&b); 442 if (len != 0) 443 error("newkeys_from_blob: remaining bytes in blob %u", len); 444 buffer_free(&b); 445 return (newkey); 446 } 447 448 int 449 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 450 { 451 Buffer b; 452 int len; 453 Enc *enc; 454 Mac *mac; 455 Comp *comp; 456 Newkeys *newkey = newkeys[mode]; 457 458 debug3("%s: converting %p", __func__, newkey); 459 460 if (newkey == NULL) { 461 error("%s: newkey == NULL", __func__); 462 return 0; 463 } 464 enc = &newkey->enc; 465 mac = &newkey->mac; 466 comp = &newkey->comp; 467 468 buffer_init(&b); 469 /* Enc structure */ 470 buffer_put_cstring(&b, enc->name); 471 /* The cipher struct is constant and shared, you export pointer */ 472 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 473 buffer_put_int(&b, enc->enabled); 474 buffer_put_int(&b, enc->block_size); 475 buffer_put_string(&b, enc->key, enc->key_len); 476 packet_get_keyiv(mode, enc->iv, enc->block_size); 477 buffer_put_string(&b, enc->iv, enc->block_size); 478 479 /* Mac structure */ 480 buffer_put_cstring(&b, mac->name); 481 buffer_put_int(&b, mac->enabled); 482 buffer_put_string(&b, mac->key, mac->key_len); 483 484 /* Comp structure */ 485 buffer_put_int(&b, comp->type); 486 buffer_put_int(&b, comp->enabled); 487 buffer_put_cstring(&b, comp->name); 488 489 len = buffer_len(&b); 490 if (lenp != NULL) 491 *lenp = len; 492 if (blobp != NULL) { 493 *blobp = xmalloc(len); 494 memcpy(*blobp, buffer_ptr(&b), len); 495 } 496 memset(buffer_ptr(&b), 0, len); 497 buffer_free(&b); 498 return len; 499 } 500 501 static void 502 mm_send_kex(Buffer *m, Kex *kex) 503 { 504 buffer_put_string(m, kex->session_id, kex->session_id_len); 505 buffer_put_int(m, kex->we_need); 506 buffer_put_int(m, kex->hostkey_type); 507 buffer_put_int(m, kex->kex_type); 508 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 509 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 510 buffer_put_int(m, kex->flags); 511 buffer_put_cstring(m, kex->client_version_string); 512 buffer_put_cstring(m, kex->server_version_string); 513 } 514 515 void 516 mm_send_keystate(struct monitor *pmonitor) 517 { 518 Buffer m; 519 u_char *blob, *p; 520 u_int bloblen, plen; 521 u_int32_t seqnr, packets; 522 u_int64_t blocks; 523 524 buffer_init(&m); 525 526 if (!compat20) { 527 u_char iv[24]; 528 u_char *key; 529 u_int ivlen, keylen; 530 531 buffer_put_int(&m, packet_get_protocol_flags()); 532 533 buffer_put_int(&m, packet_get_ssh1_cipher()); 534 535 debug3("%s: Sending ssh1 KEY+IV", __func__); 536 keylen = packet_get_encryption_key(NULL); 537 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 538 keylen = packet_get_encryption_key(key); 539 buffer_put_string(&m, key, keylen); 540 memset(key, 0, keylen); 541 xfree(key); 542 543 ivlen = packet_get_keyiv_len(MODE_OUT); 544 packet_get_keyiv(MODE_OUT, iv, ivlen); 545 buffer_put_string(&m, iv, ivlen); 546 ivlen = packet_get_keyiv_len(MODE_OUT); 547 packet_get_keyiv(MODE_IN, iv, ivlen); 548 buffer_put_string(&m, iv, ivlen); 549 goto skip; 550 } else { 551 /* Kex for rekeying */ 552 mm_send_kex(&m, *pmonitor->m_pkex); 553 } 554 555 debug3("%s: Sending new keys: %p %p", 556 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 557 558 /* Keys from Kex */ 559 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 560 fatal("%s: conversion of newkeys failed", __func__); 561 562 buffer_put_string(&m, blob, bloblen); 563 xfree(blob); 564 565 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 566 fatal("%s: conversion of newkeys failed", __func__); 567 568 buffer_put_string(&m, blob, bloblen); 569 xfree(blob); 570 571 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets); 572 buffer_put_int(&m, seqnr); 573 buffer_put_int64(&m, blocks); 574 buffer_put_int(&m, packets); 575 packet_get_state(MODE_IN, &seqnr, &blocks, &packets); 576 buffer_put_int(&m, seqnr); 577 buffer_put_int64(&m, blocks); 578 buffer_put_int(&m, packets); 579 580 debug3("%s: New keys have been sent", __func__); 581 skip: 582 /* More key context */ 583 plen = packet_get_keycontext(MODE_OUT, NULL); 584 p = xmalloc(plen+1); 585 packet_get_keycontext(MODE_OUT, p); 586 buffer_put_string(&m, p, plen); 587 xfree(p); 588 589 plen = packet_get_keycontext(MODE_IN, NULL); 590 p = xmalloc(plen+1); 591 packet_get_keycontext(MODE_IN, p); 592 buffer_put_string(&m, p, plen); 593 xfree(p); 594 595 /* Compression state */ 596 debug3("%s: Sending compression state", __func__); 597 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 598 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 599 600 /* Network I/O buffers */ 601 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 602 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 603 604 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 605 debug3("%s: Finished sending state", __func__); 606 607 buffer_free(&m); 608 } 609 610 int 611 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) 612 { 613 Buffer m; 614 char *p; 615 int success = 0; 616 617 buffer_init(&m); 618 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 619 620 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 621 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 622 623 success = buffer_get_int(&m); 624 if (success == 0) { 625 debug3("%s: pty alloc failed", __func__); 626 buffer_free(&m); 627 return (0); 628 } 629 p = buffer_get_string(&m, NULL); 630 buffer_free(&m); 631 632 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 633 xfree(p); 634 635 *ptyfd = mm_receive_fd(pmonitor->m_recvfd); 636 *ttyfd = mm_receive_fd(pmonitor->m_recvfd); 637 638 /* Success */ 639 return (1); 640 } 641 642 void 643 mm_session_pty_cleanup2(void *session) 644 { 645 Session *s = session; 646 Buffer m; 647 648 if (s->ttyfd == -1) 649 return; 650 buffer_init(&m); 651 buffer_put_cstring(&m, s->tty); 652 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 653 buffer_free(&m); 654 655 /* closed dup'ed master */ 656 if (close(s->ptymaster) < 0) 657 error("close(s->ptymaster): %s", strerror(errno)); 658 659 /* unlink pty from session */ 660 s->ttyfd = -1; 661 } 662 663 /* Request process termination */ 664 665 void 666 mm_terminate(void) 667 { 668 Buffer m; 669 670 buffer_init(&m); 671 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 672 buffer_free(&m); 673 } 674 675 int 676 mm_ssh1_session_key(BIGNUM *num) 677 { 678 int rsafail; 679 Buffer m; 680 681 buffer_init(&m); 682 buffer_put_bignum2(&m, num); 683 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 684 685 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 686 687 rsafail = buffer_get_int(&m); 688 buffer_get_bignum2(&m, num); 689 690 buffer_free(&m); 691 692 return (rsafail); 693 } 694 695 static void 696 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 697 char ***prompts, u_int **echo_on) 698 { 699 *name = xstrdup(""); 700 *infotxt = xstrdup(""); 701 *numprompts = 1; 702 *prompts = xmalloc(*numprompts * sizeof(char *)); 703 *echo_on = xmalloc(*numprompts * sizeof(u_int)); 704 (*echo_on)[0] = 0; 705 } 706 707 int 708 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 709 u_int *numprompts, char ***prompts, u_int **echo_on) 710 { 711 Buffer m; 712 u_int success; 713 char *challenge; 714 715 debug3("%s: entering", __func__); 716 717 buffer_init(&m); 718 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 719 720 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 721 &m); 722 success = buffer_get_int(&m); 723 if (success == 0) { 724 debug3("%s: no challenge", __func__); 725 buffer_free(&m); 726 return (-1); 727 } 728 729 /* Get the challenge, and format the response */ 730 challenge = buffer_get_string(&m, NULL); 731 buffer_free(&m); 732 733 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 734 (*prompts)[0] = challenge; 735 736 debug3("%s: received challenge: %s", __func__, challenge); 737 738 return (0); 739 } 740 741 int 742 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 743 { 744 Buffer m; 745 int authok; 746 747 debug3("%s: entering", __func__); 748 if (numresponses != 1) 749 return (-1); 750 751 buffer_init(&m); 752 buffer_put_cstring(&m, responses[0]); 753 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 754 755 mm_request_receive_expect(pmonitor->m_recvfd, 756 MONITOR_ANS_BSDAUTHRESPOND, &m); 757 758 authok = buffer_get_int(&m); 759 buffer_free(&m); 760 761 return ((authok == 0) ? -1 : 0); 762 } 763 764 int 765 mm_skey_query(void *ctx, char **name, char **infotxt, 766 u_int *numprompts, char ***prompts, u_int **echo_on) 767 { 768 Buffer m; 769 int len; 770 u_int success; 771 char *p, *challenge; 772 773 debug3("%s: entering", __func__); 774 775 buffer_init(&m); 776 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 777 778 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 779 &m); 780 success = buffer_get_int(&m); 781 if (success == 0) { 782 debug3("%s: no challenge", __func__); 783 buffer_free(&m); 784 return (-1); 785 } 786 787 /* Get the challenge, and format the response */ 788 challenge = buffer_get_string(&m, NULL); 789 buffer_free(&m); 790 791 debug3("%s: received challenge: %s", __func__, challenge); 792 793 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 794 795 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; 796 p = xmalloc(len); 797 strlcpy(p, challenge, len); 798 strlcat(p, SKEY_PROMPT, len); 799 (*prompts)[0] = p; 800 xfree(challenge); 801 802 return (0); 803 } 804 805 int 806 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 807 { 808 Buffer m; 809 int authok; 810 811 debug3("%s: entering", __func__); 812 if (numresponses != 1) 813 return (-1); 814 815 buffer_init(&m); 816 buffer_put_cstring(&m, responses[0]); 817 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 818 819 mm_request_receive_expect(pmonitor->m_recvfd, 820 MONITOR_ANS_SKEYRESPOND, &m); 821 822 authok = buffer_get_int(&m); 823 buffer_free(&m); 824 825 return ((authok == 0) ? -1 : 0); 826 } 827 828 void 829 mm_ssh1_session_id(u_char session_id[16]) 830 { 831 Buffer m; 832 int i; 833 834 debug3("%s entering", __func__); 835 836 buffer_init(&m); 837 for (i = 0; i < 16; i++) 838 buffer_put_char(&m, session_id[i]); 839 840 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 841 buffer_free(&m); 842 } 843 844 int 845 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 846 { 847 Buffer m; 848 Key *key; 849 u_char *blob; 850 u_int blen; 851 int allowed = 0, have_forced = 0; 852 853 debug3("%s entering", __func__); 854 855 buffer_init(&m); 856 buffer_put_bignum2(&m, client_n); 857 858 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 859 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 860 861 allowed = buffer_get_int(&m); 862 863 /* fake forced command */ 864 auth_clear_options(); 865 have_forced = buffer_get_int(&m); 866 forced_command = have_forced ? xstrdup("true") : NULL; 867 868 if (allowed && rkey != NULL) { 869 blob = buffer_get_string(&m, &blen); 870 if ((key = key_from_blob(blob, blen)) == NULL) 871 fatal("%s: key_from_blob failed", __func__); 872 *rkey = key; 873 xfree(blob); 874 } 875 mm_send_debug(&m); 876 buffer_free(&m); 877 878 return (allowed); 879 } 880 881 BIGNUM * 882 mm_auth_rsa_generate_challenge(Key *key) 883 { 884 Buffer m; 885 BIGNUM *challenge; 886 u_char *blob; 887 u_int blen; 888 889 debug3("%s entering", __func__); 890 891 if ((challenge = BN_new()) == NULL) 892 fatal("%s: BN_new failed", __func__); 893 894 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 895 if (key_to_blob(key, &blob, &blen) == 0) 896 fatal("%s: key_to_blob failed", __func__); 897 key->type = KEY_RSA1; 898 899 buffer_init(&m); 900 buffer_put_string(&m, blob, blen); 901 xfree(blob); 902 903 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 904 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 905 906 buffer_get_bignum2(&m, challenge); 907 buffer_free(&m); 908 909 return (challenge); 910 } 911 912 int 913 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 914 { 915 Buffer m; 916 u_char *blob; 917 u_int blen; 918 int success = 0; 919 920 debug3("%s entering", __func__); 921 922 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 923 if (key_to_blob(key, &blob, &blen) == 0) 924 fatal("%s: key_to_blob failed", __func__); 925 key->type = KEY_RSA1; 926 927 buffer_init(&m); 928 buffer_put_string(&m, blob, blen); 929 buffer_put_string(&m, response, 16); 930 xfree(blob); 931 932 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 933 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 934 935 success = buffer_get_int(&m); 936 buffer_free(&m); 937 938 return (success); 939 } 940 941 #ifdef KRB5 942 int 943 mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp) 944 { 945 krb5_data *tkt, *reply; 946 Buffer m; 947 int success; 948 949 debug3("%s entering", __func__); 950 tkt = (krb5_data *) argp; 951 reply = (krb5_data *) resp; 952 953 buffer_init(&m); 954 buffer_put_string(&m, tkt->data, tkt->length); 955 956 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m); 957 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m); 958 959 success = buffer_get_int(&m); 960 if (success) { 961 u_int len; 962 963 *userp = buffer_get_string(&m, NULL); 964 reply->data = buffer_get_string(&m, &len); 965 reply->length = len; 966 } else { 967 memset(reply, 0, sizeof(*reply)); 968 *userp = NULL; 969 } 970 971 buffer_free(&m); 972 return (success); 973 } 974 #endif 975