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 1.20 2002/11/21 23:03:51 deraadt 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 "buffer.h" 38 #include "bufaux.h" 39 #include "packet.h" 40 #include "mac.h" 41 #include "log.h" 42 #include "zlib.h" 43 #include "monitor.h" 44 #include "monitor_wrap.h" 45 #include "xmalloc.h" 46 #include "atomicio.h" 47 #include "monitor_fdpass.h" 48 #include "getput.h" 49 50 #include "auth.h" 51 #include "channels.h" 52 #include "session.h" 53 54 /* Imports */ 55 extern int compat20; 56 extern Newkeys *newkeys[]; 57 extern z_stream incoming_stream; 58 extern z_stream outgoing_stream; 59 extern struct monitor *pmonitor; 60 extern Buffer input, output; 61 62 void 63 mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) 64 { 65 u_int mlen = buffer_len(m); 66 u_char buf[5]; 67 68 debug3("%s entering: type %d", __func__, type); 69 70 PUT_32BIT(buf, mlen + 1); 71 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 72 if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf)) 73 fatal("%s: write", __func__); 74 if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen) 75 fatal("%s: write", __func__); 76 } 77 78 void 79 mm_request_receive(int socket, Buffer *m) 80 { 81 u_char buf[4]; 82 u_int msg_len; 83 ssize_t res; 84 85 debug3("%s entering", __func__); 86 87 res = atomicio(read, socket, buf, sizeof(buf)); 88 if (res != sizeof(buf)) { 89 if (res == 0) 90 fatal_cleanup(); 91 fatal("%s: read: %ld", __func__, (long)res); 92 } 93 msg_len = GET_32BIT(buf); 94 if (msg_len > 256 * 1024) 95 fatal("%s: read: bad msg_len %d", __func__, msg_len); 96 buffer_clear(m); 97 buffer_append_space(m, msg_len); 98 res = atomicio(read, socket, buffer_ptr(m), msg_len); 99 if (res != msg_len) 100 fatal("%s: read: %ld != msg_len", __func__, (long)res); 101 } 102 103 void 104 mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m) 105 { 106 u_char rtype; 107 108 debug3("%s entering: type %d", __func__, type); 109 110 mm_request_receive(socket, m); 111 rtype = buffer_get_char(m); 112 if (rtype != type) 113 fatal("%s: read: rtype %d != type %d", __func__, 114 rtype, type); 115 } 116 117 DH * 118 mm_choose_dh(int min, int nbits, int max) 119 { 120 BIGNUM *p, *g; 121 int success = 0; 122 Buffer m; 123 124 buffer_init(&m); 125 buffer_put_int(&m, min); 126 buffer_put_int(&m, nbits); 127 buffer_put_int(&m, max); 128 129 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 130 131 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 132 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 133 134 success = buffer_get_char(&m); 135 if (success == 0) 136 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 137 138 if ((p = BN_new()) == NULL) 139 fatal("%s: BN_new failed", __func__); 140 if ((g = BN_new()) == NULL) 141 fatal("%s: BN_new failed", __func__); 142 buffer_get_bignum2(&m, p); 143 buffer_get_bignum2(&m, g); 144 145 debug3("%s: remaining %d", __func__, buffer_len(&m)); 146 buffer_free(&m); 147 148 return (dh_new_group(g, p)); 149 } 150 151 int 152 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 153 { 154 Kex *kex = *pmonitor->m_pkex; 155 Buffer m; 156 157 debug3("%s entering", __func__); 158 159 buffer_init(&m); 160 buffer_put_int(&m, kex->host_key_index(key)); 161 buffer_put_string(&m, data, datalen); 162 163 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 164 165 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 166 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 167 *sigp = buffer_get_string(&m, lenp); 168 buffer_free(&m); 169 170 return (0); 171 } 172 173 struct passwd * 174 mm_getpwnamallow(const char *login) 175 { 176 Buffer m; 177 struct passwd *pw; 178 u_int pwlen; 179 180 debug3("%s entering", __func__); 181 182 buffer_init(&m); 183 buffer_put_cstring(&m, login); 184 185 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 186 187 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 188 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 189 190 if (buffer_get_char(&m) == 0) { 191 buffer_free(&m); 192 return (NULL); 193 } 194 pw = buffer_get_string(&m, &pwlen); 195 if (pwlen != sizeof(struct passwd)) 196 fatal("%s: struct passwd size mismatch", __func__); 197 pw->pw_name = buffer_get_string(&m, NULL); 198 pw->pw_passwd = buffer_get_string(&m, NULL); 199 pw->pw_gecos = buffer_get_string(&m, NULL); 200 pw->pw_class = buffer_get_string(&m, NULL); 201 pw->pw_dir = buffer_get_string(&m, NULL); 202 pw->pw_shell = buffer_get_string(&m, NULL); 203 buffer_free(&m); 204 205 return (pw); 206 } 207 208 char *mm_auth2_read_banner(void) 209 { 210 Buffer m; 211 char *banner; 212 213 debug3("%s entering", __func__); 214 215 buffer_init(&m); 216 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 217 buffer_clear(&m); 218 219 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m); 220 banner = buffer_get_string(&m, NULL); 221 buffer_free(&m); 222 223 return (banner); 224 } 225 226 /* Inform the privileged process about service and style */ 227 228 void 229 mm_inform_authserv(char *service, char *style) 230 { 231 Buffer m; 232 233 debug3("%s entering", __func__); 234 235 buffer_init(&m); 236 buffer_put_cstring(&m, service); 237 buffer_put_cstring(&m, style ? style : ""); 238 239 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 240 241 buffer_free(&m); 242 } 243 244 /* Do the password authentication */ 245 int 246 mm_auth_password(Authctxt *authctxt, char *password) 247 { 248 Buffer m; 249 int authenticated = 0; 250 251 debug3("%s entering", __func__); 252 253 buffer_init(&m); 254 buffer_put_cstring(&m, password); 255 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 256 257 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 258 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 259 260 authenticated = buffer_get_int(&m); 261 262 buffer_free(&m); 263 264 debug3("%s: user %sauthenticated", 265 __func__, authenticated ? "" : "not "); 266 return (authenticated); 267 } 268 269 int 270 mm_user_key_allowed(struct passwd *pw, Key *key) 271 { 272 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 273 } 274 275 int 276 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 277 Key *key) 278 { 279 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 280 } 281 282 int 283 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 284 char *host, Key *key) 285 { 286 int ret; 287 288 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 289 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 290 key->type = KEY_RSA1; 291 return (ret); 292 } 293 294 static void 295 mm_send_debug(Buffer *m) 296 { 297 char *msg; 298 299 while (buffer_len(m)) { 300 msg = buffer_get_string(m, NULL); 301 debug3("%s: Sending debug: %s", __func__, msg); 302 packet_send_debug("%s", msg); 303 xfree(msg); 304 } 305 } 306 307 int 308 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 309 { 310 Buffer m; 311 u_char *blob; 312 u_int len; 313 int allowed = 0; 314 315 debug3("%s entering", __func__); 316 317 /* Convert the key to a blob and the pass it over */ 318 if (!key_to_blob(key, &blob, &len)) 319 return (0); 320 321 buffer_init(&m); 322 buffer_put_int(&m, type); 323 buffer_put_cstring(&m, user ? user : ""); 324 buffer_put_cstring(&m, host ? host : ""); 325 buffer_put_string(&m, blob, len); 326 xfree(blob); 327 328 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 329 330 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 331 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 332 333 allowed = buffer_get_int(&m); 334 335 /* Send potential debug messages */ 336 mm_send_debug(&m); 337 338 buffer_free(&m); 339 340 return (allowed); 341 } 342 343 /* 344 * This key verify needs to send the key type along, because the 345 * privileged parent makes the decision if the key is allowed 346 * for authentication. 347 */ 348 349 int 350 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 351 { 352 Buffer m; 353 u_char *blob; 354 u_int len; 355 int verified = 0; 356 357 debug3("%s entering", __func__); 358 359 /* Convert the key to a blob and the pass it over */ 360 if (!key_to_blob(key, &blob, &len)) 361 return (0); 362 363 buffer_init(&m); 364 buffer_put_string(&m, blob, len); 365 buffer_put_string(&m, sig, siglen); 366 buffer_put_string(&m, data, datalen); 367 xfree(blob); 368 369 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 370 371 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 372 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 373 374 verified = buffer_get_int(&m); 375 376 buffer_free(&m); 377 378 return (verified); 379 } 380 381 /* Export key state after authentication */ 382 Newkeys * 383 mm_newkeys_from_blob(u_char *blob, int blen) 384 { 385 Buffer b; 386 u_int len; 387 Newkeys *newkey = NULL; 388 Enc *enc; 389 Mac *mac; 390 Comp *comp; 391 392 debug3("%s: %p(%d)", __func__, blob, blen); 393 #ifdef DEBUG_PK 394 dump_base64(stderr, blob, blen); 395 #endif 396 buffer_init(&b); 397 buffer_append(&b, blob, blen); 398 399 newkey = xmalloc(sizeof(*newkey)); 400 enc = &newkey->enc; 401 mac = &newkey->mac; 402 comp = &newkey->comp; 403 404 /* Enc structure */ 405 enc->name = buffer_get_string(&b, NULL); 406 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 407 enc->enabled = buffer_get_int(&b); 408 enc->block_size = buffer_get_int(&b); 409 enc->key = buffer_get_string(&b, &enc->key_len); 410 enc->iv = buffer_get_string(&b, &len); 411 if (len != enc->block_size) 412 fatal("%s: bad ivlen: expected %u != %u", __func__, 413 enc->block_size, len); 414 415 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 416 fatal("%s: bad cipher name %s or pointer %p", __func__, 417 enc->name, enc->cipher); 418 419 /* Mac structure */ 420 mac->name = buffer_get_string(&b, NULL); 421 if (mac->name == NULL || mac_init(mac, mac->name) == -1) 422 fatal("%s: can not init mac %s", __func__, mac->name); 423 mac->enabled = buffer_get_int(&b); 424 mac->key = buffer_get_string(&b, &len); 425 if (len > mac->key_len) 426 fatal("%s: bad mac key length: %u > %d", __func__, len, 427 mac->key_len); 428 mac->key_len = len; 429 430 /* Comp structure */ 431 comp->type = buffer_get_int(&b); 432 comp->enabled = buffer_get_int(&b); 433 comp->name = buffer_get_string(&b, NULL); 434 435 len = buffer_len(&b); 436 if (len != 0) 437 error("newkeys_from_blob: remaining bytes in blob %u", len); 438 buffer_free(&b); 439 return (newkey); 440 } 441 442 int 443 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 444 { 445 Buffer b; 446 int len; 447 Enc *enc; 448 Mac *mac; 449 Comp *comp; 450 Newkeys *newkey = newkeys[mode]; 451 452 debug3("%s: converting %p", __func__, newkey); 453 454 if (newkey == NULL) { 455 error("%s: newkey == NULL", __func__); 456 return 0; 457 } 458 enc = &newkey->enc; 459 mac = &newkey->mac; 460 comp = &newkey->comp; 461 462 buffer_init(&b); 463 /* Enc structure */ 464 buffer_put_cstring(&b, enc->name); 465 /* The cipher struct is constant and shared, you export pointer */ 466 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 467 buffer_put_int(&b, enc->enabled); 468 buffer_put_int(&b, enc->block_size); 469 buffer_put_string(&b, enc->key, enc->key_len); 470 packet_get_keyiv(mode, enc->iv, enc->block_size); 471 buffer_put_string(&b, enc->iv, enc->block_size); 472 473 /* Mac structure */ 474 buffer_put_cstring(&b, mac->name); 475 buffer_put_int(&b, mac->enabled); 476 buffer_put_string(&b, mac->key, mac->key_len); 477 478 /* Comp structure */ 479 buffer_put_int(&b, comp->type); 480 buffer_put_int(&b, comp->enabled); 481 buffer_put_cstring(&b, comp->name); 482 483 len = buffer_len(&b); 484 if (lenp != NULL) 485 *lenp = len; 486 if (blobp != NULL) { 487 *blobp = xmalloc(len); 488 memcpy(*blobp, buffer_ptr(&b), len); 489 } 490 memset(buffer_ptr(&b), 0, len); 491 buffer_free(&b); 492 return len; 493 } 494 495 static void 496 mm_send_kex(Buffer *m, Kex *kex) 497 { 498 buffer_put_string(m, kex->session_id, kex->session_id_len); 499 buffer_put_int(m, kex->we_need); 500 buffer_put_int(m, kex->hostkey_type); 501 buffer_put_int(m, kex->kex_type); 502 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 503 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 504 buffer_put_int(m, kex->flags); 505 buffer_put_cstring(m, kex->client_version_string); 506 buffer_put_cstring(m, kex->server_version_string); 507 } 508 509 void 510 mm_send_keystate(struct monitor *pmonitor) 511 { 512 Buffer m; 513 u_char *blob, *p; 514 u_int bloblen, plen; 515 516 buffer_init(&m); 517 518 if (!compat20) { 519 u_char iv[24]; 520 u_char *key; 521 u_int ivlen, keylen; 522 523 buffer_put_int(&m, packet_get_protocol_flags()); 524 525 buffer_put_int(&m, packet_get_ssh1_cipher()); 526 527 debug3("%s: Sending ssh1 KEY+IV", __func__); 528 keylen = packet_get_encryption_key(NULL); 529 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 530 keylen = packet_get_encryption_key(key); 531 buffer_put_string(&m, key, keylen); 532 memset(key, 0, keylen); 533 xfree(key); 534 535 ivlen = packet_get_keyiv_len(MODE_OUT); 536 packet_get_keyiv(MODE_OUT, iv, ivlen); 537 buffer_put_string(&m, iv, ivlen); 538 ivlen = packet_get_keyiv_len(MODE_OUT); 539 packet_get_keyiv(MODE_IN, iv, ivlen); 540 buffer_put_string(&m, iv, ivlen); 541 goto skip; 542 } else { 543 /* Kex for rekeying */ 544 mm_send_kex(&m, *pmonitor->m_pkex); 545 } 546 547 debug3("%s: Sending new keys: %p %p", 548 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 549 550 /* Keys from Kex */ 551 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 552 fatal("%s: conversion of newkeys failed", __func__); 553 554 buffer_put_string(&m, blob, bloblen); 555 xfree(blob); 556 557 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 558 fatal("%s: conversion of newkeys failed", __func__); 559 560 buffer_put_string(&m, blob, bloblen); 561 xfree(blob); 562 563 buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); 564 buffer_put_int(&m, packet_get_seqnr(MODE_IN)); 565 566 debug3("%s: New keys have been sent", __func__); 567 skip: 568 /* More key context */ 569 plen = packet_get_keycontext(MODE_OUT, NULL); 570 p = xmalloc(plen+1); 571 packet_get_keycontext(MODE_OUT, p); 572 buffer_put_string(&m, p, plen); 573 xfree(p); 574 575 plen = packet_get_keycontext(MODE_IN, NULL); 576 p = xmalloc(plen+1); 577 packet_get_keycontext(MODE_IN, p); 578 buffer_put_string(&m, p, plen); 579 xfree(p); 580 581 /* Compression state */ 582 debug3("%s: Sending compression state", __func__); 583 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 584 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 585 586 /* Network I/O buffers */ 587 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 588 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 589 590 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 591 debug3("%s: Finished sending state", __func__); 592 593 buffer_free(&m); 594 } 595 596 int 597 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) 598 { 599 Buffer m; 600 char *p; 601 int success = 0; 602 603 buffer_init(&m); 604 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 605 606 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 607 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 608 609 success = buffer_get_int(&m); 610 if (success == 0) { 611 debug3("%s: pty alloc failed", __func__); 612 buffer_free(&m); 613 return (0); 614 } 615 p = buffer_get_string(&m, NULL); 616 buffer_free(&m); 617 618 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 619 xfree(p); 620 621 *ptyfd = mm_receive_fd(pmonitor->m_recvfd); 622 *ttyfd = mm_receive_fd(pmonitor->m_recvfd); 623 624 /* Success */ 625 return (1); 626 } 627 628 void 629 mm_session_pty_cleanup2(void *session) 630 { 631 Session *s = session; 632 Buffer m; 633 634 if (s->ttyfd == -1) 635 return; 636 buffer_init(&m); 637 buffer_put_cstring(&m, s->tty); 638 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 639 buffer_free(&m); 640 641 /* closed dup'ed master */ 642 if (close(s->ptymaster) < 0) 643 error("close(s->ptymaster): %s", strerror(errno)); 644 645 /* unlink pty from session */ 646 s->ttyfd = -1; 647 } 648 649 /* Request process termination */ 650 651 void 652 mm_terminate(void) 653 { 654 Buffer m; 655 656 buffer_init(&m); 657 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 658 buffer_free(&m); 659 } 660 661 int 662 mm_ssh1_session_key(BIGNUM *num) 663 { 664 int rsafail; 665 Buffer m; 666 667 buffer_init(&m); 668 buffer_put_bignum2(&m, num); 669 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 670 671 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 672 673 rsafail = buffer_get_int(&m); 674 buffer_get_bignum2(&m, num); 675 676 buffer_free(&m); 677 678 return (rsafail); 679 } 680 681 static void 682 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 683 char ***prompts, u_int **echo_on) 684 { 685 *name = xstrdup(""); 686 *infotxt = xstrdup(""); 687 *numprompts = 1; 688 *prompts = xmalloc(*numprompts * sizeof(char *)); 689 *echo_on = xmalloc(*numprompts * sizeof(u_int)); 690 (*echo_on)[0] = 0; 691 } 692 693 int 694 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 695 u_int *numprompts, char ***prompts, u_int **echo_on) 696 { 697 Buffer m; 698 int res; 699 char *challenge; 700 701 debug3("%s: entering", __func__); 702 703 buffer_init(&m); 704 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 705 706 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 707 &m); 708 res = buffer_get_int(&m); 709 if (res == -1) { 710 debug3("%s: no challenge", __func__); 711 buffer_free(&m); 712 return (-1); 713 } 714 715 /* Get the challenge, and format the response */ 716 challenge = buffer_get_string(&m, NULL); 717 buffer_free(&m); 718 719 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 720 (*prompts)[0] = challenge; 721 722 debug3("%s: received challenge: %s", __func__, challenge); 723 724 return (0); 725 } 726 727 int 728 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 729 { 730 Buffer m; 731 int authok; 732 733 debug3("%s: entering", __func__); 734 if (numresponses != 1) 735 return (-1); 736 737 buffer_init(&m); 738 buffer_put_cstring(&m, responses[0]); 739 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 740 741 mm_request_receive_expect(pmonitor->m_recvfd, 742 MONITOR_ANS_BSDAUTHRESPOND, &m); 743 744 authok = buffer_get_int(&m); 745 buffer_free(&m); 746 747 return ((authok == 0) ? -1 : 0); 748 } 749 750 int 751 mm_skey_query(void *ctx, char **name, char **infotxt, 752 u_int *numprompts, char ***prompts, u_int **echo_on) 753 { 754 Buffer m; 755 int len, res; 756 char *p, *challenge; 757 758 debug3("%s: entering", __func__); 759 760 buffer_init(&m); 761 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 762 763 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 764 &m); 765 res = buffer_get_int(&m); 766 if (res == -1) { 767 debug3("%s: no challenge", __func__); 768 buffer_free(&m); 769 return (-1); 770 } 771 772 /* Get the challenge, and format the response */ 773 challenge = buffer_get_string(&m, NULL); 774 buffer_free(&m); 775 776 debug3("%s: received challenge: %s", __func__, challenge); 777 778 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 779 780 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; 781 p = xmalloc(len); 782 strlcpy(p, challenge, len); 783 strlcat(p, SKEY_PROMPT, len); 784 (*prompts)[0] = p; 785 xfree(challenge); 786 787 return (0); 788 } 789 790 int 791 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 792 { 793 Buffer m; 794 int authok; 795 796 debug3("%s: entering", __func__); 797 if (numresponses != 1) 798 return (-1); 799 800 buffer_init(&m); 801 buffer_put_cstring(&m, responses[0]); 802 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 803 804 mm_request_receive_expect(pmonitor->m_recvfd, 805 MONITOR_ANS_SKEYRESPOND, &m); 806 807 authok = buffer_get_int(&m); 808 buffer_free(&m); 809 810 return ((authok == 0) ? -1 : 0); 811 } 812 813 void 814 mm_ssh1_session_id(u_char session_id[16]) 815 { 816 Buffer m; 817 int i; 818 819 debug3("%s entering", __func__); 820 821 buffer_init(&m); 822 for (i = 0; i < 16; i++) 823 buffer_put_char(&m, session_id[i]); 824 825 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 826 buffer_free(&m); 827 } 828 829 int 830 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 831 { 832 Buffer m; 833 Key *key; 834 u_char *blob; 835 u_int blen; 836 int allowed = 0; 837 838 debug3("%s entering", __func__); 839 840 buffer_init(&m); 841 buffer_put_bignum2(&m, client_n); 842 843 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 844 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 845 846 allowed = buffer_get_int(&m); 847 848 if (allowed && rkey != NULL) { 849 blob = buffer_get_string(&m, &blen); 850 if ((key = key_from_blob(blob, blen)) == NULL) 851 fatal("%s: key_from_blob failed", __func__); 852 *rkey = key; 853 xfree(blob); 854 } 855 mm_send_debug(&m); 856 buffer_free(&m); 857 858 return (allowed); 859 } 860 861 BIGNUM * 862 mm_auth_rsa_generate_challenge(Key *key) 863 { 864 Buffer m; 865 BIGNUM *challenge; 866 u_char *blob; 867 u_int blen; 868 869 debug3("%s entering", __func__); 870 871 if ((challenge = BN_new()) == NULL) 872 fatal("%s: BN_new failed", __func__); 873 874 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 875 if (key_to_blob(key, &blob, &blen) == 0) 876 fatal("%s: key_to_blob failed", __func__); 877 key->type = KEY_RSA1; 878 879 buffer_init(&m); 880 buffer_put_string(&m, blob, blen); 881 xfree(blob); 882 883 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 884 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 885 886 buffer_get_bignum2(&m, challenge); 887 buffer_free(&m); 888 889 return (challenge); 890 } 891 892 int 893 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 894 { 895 Buffer m; 896 u_char *blob; 897 u_int blen; 898 int success = 0; 899 900 debug3("%s entering", __func__); 901 902 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 903 if (key_to_blob(key, &blob, &blen) == 0) 904 fatal("%s: key_to_blob failed", __func__); 905 key->type = KEY_RSA1; 906 907 buffer_init(&m); 908 buffer_put_string(&m, blob, blen); 909 buffer_put_string(&m, response, 16); 910 xfree(blob); 911 912 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 913 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 914 915 success = buffer_get_int(&m); 916 buffer_free(&m); 917 918 return (success); 919 } 920 921 #ifdef KRB4 922 int 923 mm_auth_krb4(Authctxt *authctxt, void *_auth, char **client, void *_reply) 924 { 925 KTEXT auth, reply; 926 Buffer m; 927 u_int rlen; 928 int success = 0; 929 char *p; 930 931 debug3("%s entering", __func__); 932 auth = _auth; 933 reply = _reply; 934 935 buffer_init(&m); 936 buffer_put_string(&m, auth->dat, auth->length); 937 938 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB4, &m); 939 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB4, &m); 940 941 success = buffer_get_int(&m); 942 if (success) { 943 *client = buffer_get_string(&m, NULL); 944 p = buffer_get_string(&m, &rlen); 945 if (rlen >= MAX_KTXT_LEN) 946 fatal("%s: reply from monitor too large", __func__); 947 reply->length = rlen; 948 memcpy(reply->dat, p, rlen); 949 memset(p, 0, rlen); 950 xfree(p); 951 } 952 buffer_free(&m); 953 return (success); 954 } 955 #endif 956 957 #ifdef KRB5 958 int 959 mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp) 960 { 961 krb5_data *tkt, *reply; 962 Buffer m; 963 int success; 964 965 debug3("%s entering", __func__); 966 tkt = (krb5_data *) argp; 967 reply = (krb5_data *) resp; 968 969 buffer_init(&m); 970 buffer_put_string(&m, tkt->data, tkt->length); 971 972 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m); 973 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m); 974 975 success = buffer_get_int(&m); 976 if (success) { 977 u_int len; 978 979 *userp = buffer_get_string(&m, NULL); 980 reply->data = buffer_get_string(&m, &len); 981 reply->length = len; 982 } else { 983 memset(reply, 0, sizeof(*reply)); 984 *userp = NULL; 985 } 986 987 buffer_free(&m); 988 return (success); 989 } 990 #endif 991