monitor_wrap.c revision 99046
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" 28RCSID("$OpenBSD: monitor_wrap.c,v 1.11 2002/06/19 18:01:00 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 "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 */ 55extern int compat20; 56extern Newkeys *newkeys[]; 57extern z_stream incoming_stream; 58extern z_stream outgoing_stream; 59extern struct monitor *pmonitor; 60extern Buffer input, output; 61 62void 63mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) 64{ 65 u_char buf[5]; 66 u_int mlen = buffer_len(m); 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 78void 79mm_request_receive(int socket, Buffer *m) 80{ 81 u_char buf[4]; 82 ssize_t res; 83 u_int msg_len; 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 103void 104mm_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 117DH * 118mm_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 151int 152mm_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 173struct passwd * 174mm_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#ifdef HAVE_PW_CLASS_IN_PASSWD 201 pw->pw_class = buffer_get_string(&m, NULL); 202#endif 203 pw->pw_dir = buffer_get_string(&m, NULL); 204 pw->pw_shell = buffer_get_string(&m, NULL); 205 buffer_free(&m); 206 207 return (pw); 208} 209 210char* mm_auth2_read_banner(void) 211{ 212 Buffer m; 213 char *banner; 214 215 debug3("%s entering", __func__); 216 217 buffer_init(&m); 218 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 219 buffer_clear(&m); 220 221 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m); 222 banner = buffer_get_string(&m, NULL); 223 buffer_free(&m); 224 225 return (banner); 226} 227 228/* Inform the privileged process about service and style */ 229 230void 231mm_inform_authserv(char *service, char *style) 232{ 233 Buffer m; 234 235 debug3("%s entering", __func__); 236 237 buffer_init(&m); 238 buffer_put_cstring(&m, service); 239 buffer_put_cstring(&m, style ? style : ""); 240 241 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 242 243 buffer_free(&m); 244} 245 246/* Do the password authentication */ 247int 248mm_auth_password(Authctxt *authctxt, char *password) 249{ 250 Buffer m; 251 int authenticated = 0; 252 253 debug3("%s entering", __func__); 254 255 buffer_init(&m); 256 buffer_put_cstring(&m, password); 257 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 258 259 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 260 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 261 262 authenticated = buffer_get_int(&m); 263 264 buffer_free(&m); 265 266 debug3("%s: user %sauthenticated", 267 __func__, authenticated ? "" : "not "); 268 return (authenticated); 269} 270 271int 272mm_user_key_allowed(struct passwd *pw, Key *key) 273{ 274 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 275} 276 277int 278mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 279 Key *key) 280{ 281 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 282} 283 284int 285mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 286 char *host, Key *key) 287{ 288 int ret; 289 290 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 291 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 292 key->type = KEY_RSA1; 293 return (ret); 294} 295 296static void 297mm_send_debug(Buffer *m) 298{ 299 char *msg; 300 301 while (buffer_len(m)) { 302 msg = buffer_get_string(m, NULL); 303 debug3("%s: Sending debug: %s", __func__, msg); 304 packet_send_debug("%s", msg); 305 xfree(msg); 306 } 307} 308 309int 310mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 311{ 312 Buffer m; 313 u_char *blob; 314 u_int len; 315 int allowed = 0; 316 317 debug3("%s entering", __func__); 318 319 /* Convert the key to a blob and the pass it over */ 320 if (!key_to_blob(key, &blob, &len)) 321 return (0); 322 323 buffer_init(&m); 324 buffer_put_int(&m, type); 325 buffer_put_cstring(&m, user ? user : ""); 326 buffer_put_cstring(&m, host ? host : ""); 327 buffer_put_string(&m, blob, len); 328 xfree(blob); 329 330 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 331 332 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 333 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 334 335 allowed = buffer_get_int(&m); 336 337 /* Send potential debug messages */ 338 mm_send_debug(&m); 339 340 buffer_free(&m); 341 342 return (allowed); 343} 344 345/* 346 * This key verify needs to send the key type along, because the 347 * privileged parent makes the decision if the key is allowed 348 * for authentication. 349 */ 350 351int 352mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 353{ 354 Buffer m; 355 u_char *blob; 356 u_int len; 357 int verified = 0; 358 359 debug3("%s entering", __func__); 360 361 /* Convert the key to a blob and the pass it over */ 362 if (!key_to_blob(key, &blob, &len)) 363 return (0); 364 365 buffer_init(&m); 366 buffer_put_string(&m, blob, len); 367 buffer_put_string(&m, sig, siglen); 368 buffer_put_string(&m, data, datalen); 369 xfree(blob); 370 371 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 372 373 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 374 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 375 376 verified = buffer_get_int(&m); 377 378 buffer_free(&m); 379 380 return (verified); 381} 382 383/* Export key state after authentication */ 384Newkeys * 385mm_newkeys_from_blob(u_char *blob, int blen) 386{ 387 Buffer b; 388 u_int len; 389 Newkeys *newkey = NULL; 390 Enc *enc; 391 Mac *mac; 392 Comp *comp; 393 394 debug3("%s: %p(%d)", __func__, blob, blen); 395#ifdef DEBUG_PK 396 dump_base64(stderr, blob, blen); 397#endif 398 buffer_init(&b); 399 buffer_append(&b, blob, blen); 400 401 newkey = xmalloc(sizeof(*newkey)); 402 enc = &newkey->enc; 403 mac = &newkey->mac; 404 comp = &newkey->comp; 405 406 /* Enc structure */ 407 enc->name = buffer_get_string(&b, NULL); 408 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 409 enc->enabled = buffer_get_int(&b); 410 enc->block_size = buffer_get_int(&b); 411 enc->key = buffer_get_string(&b, &enc->key_len); 412 enc->iv = buffer_get_string(&b, &len); 413 if (len != enc->block_size) 414 fatal("%s: bad ivlen: expected %d != %d", __func__, 415 enc->block_size, len); 416 417 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 418 fatal("%s: bad cipher name %s or pointer %p", __func__, 419 enc->name, enc->cipher); 420 421 /* Mac structure */ 422 mac->name = buffer_get_string(&b, NULL); 423 if (mac->name == NULL || mac_init(mac, mac->name) == -1) 424 fatal("%s: can not init mac %s", __func__, mac->name); 425 mac->enabled = buffer_get_int(&b); 426 mac->key = buffer_get_string(&b, &len); 427 if (len > mac->key_len) 428 fatal("%s: bad mac key length: %d > %d", __func__, len, 429 mac->key_len); 430 mac->key_len = len; 431 432 /* Comp structure */ 433 comp->type = buffer_get_int(&b); 434 comp->enabled = buffer_get_int(&b); 435 comp->name = buffer_get_string(&b, NULL); 436 437 len = buffer_len(&b); 438 if (len != 0) 439 error("newkeys_from_blob: remaining bytes in blob %d", len); 440 buffer_free(&b); 441 return (newkey); 442} 443 444int 445mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 446{ 447 Buffer b; 448 int len; 449 u_char *buf; 450 Enc *enc; 451 Mac *mac; 452 Comp *comp; 453 Newkeys *newkey = newkeys[mode]; 454 455 debug3("%s: converting %p", __func__, newkey); 456 457 if (newkey == NULL) { 458 error("%s: newkey == NULL", __func__); 459 return 0; 460 } 461 enc = &newkey->enc; 462 mac = &newkey->mac; 463 comp = &newkey->comp; 464 465 buffer_init(&b); 466 /* Enc structure */ 467 buffer_put_cstring(&b, enc->name); 468 /* The cipher struct is constant and shared, you export pointer */ 469 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 470 buffer_put_int(&b, enc->enabled); 471 buffer_put_int(&b, enc->block_size); 472 buffer_put_string(&b, enc->key, enc->key_len); 473 packet_get_keyiv(mode, enc->iv, enc->block_size); 474 buffer_put_string(&b, enc->iv, enc->block_size); 475 476 /* Mac structure */ 477 buffer_put_cstring(&b, mac->name); 478 buffer_put_int(&b, mac->enabled); 479 buffer_put_string(&b, mac->key, mac->key_len); 480 481 /* Comp structure */ 482 buffer_put_int(&b, comp->type); 483 buffer_put_int(&b, comp->enabled); 484 buffer_put_cstring(&b, comp->name); 485 486 len = buffer_len(&b); 487 buf = xmalloc(len); 488 memcpy(buf, buffer_ptr(&b), len); 489 memset(buffer_ptr(&b), 0, len); 490 buffer_free(&b); 491 if (lenp != NULL) 492 *lenp = len; 493 if (blobp != NULL) 494 *blobp = buf; 495 return len; 496} 497 498static void 499mm_send_kex(Buffer *m, Kex *kex) 500{ 501 buffer_put_string(m, kex->session_id, kex->session_id_len); 502 buffer_put_int(m, kex->we_need); 503 buffer_put_int(m, kex->hostkey_type); 504 buffer_put_int(m, kex->kex_type); 505 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 506 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 507 buffer_put_int(m, kex->flags); 508 buffer_put_cstring(m, kex->client_version_string); 509 buffer_put_cstring(m, kex->server_version_string); 510} 511 512void 513mm_send_keystate(struct monitor *pmonitor) 514{ 515 Buffer m; 516 u_char *blob, *p; 517 u_int bloblen, plen; 518 519 buffer_init(&m); 520 521 if (!compat20) { 522 u_char iv[24]; 523 u_char *key; 524 u_int ivlen, keylen; 525 526 buffer_put_int(&m, packet_get_protocol_flags()); 527 528 buffer_put_int(&m, packet_get_ssh1_cipher()); 529 530 debug3("%s: Sending ssh1 KEY+IV", __func__); 531 keylen = packet_get_encryption_key(NULL); 532 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 533 keylen = packet_get_encryption_key(key); 534 buffer_put_string(&m, key, keylen); 535 memset(key, 0, keylen); 536 xfree(key); 537 538 ivlen = packet_get_keyiv_len(MODE_OUT); 539 packet_get_keyiv(MODE_OUT, iv, ivlen); 540 buffer_put_string(&m, iv, ivlen); 541 ivlen = packet_get_keyiv_len(MODE_OUT); 542 packet_get_keyiv(MODE_IN, iv, ivlen); 543 buffer_put_string(&m, iv, ivlen); 544 goto skip; 545 } else { 546 /* Kex for rekeying */ 547 mm_send_kex(&m, *pmonitor->m_pkex); 548 } 549 550 debug3("%s: Sending new keys: %p %p", 551 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 552 553 /* Keys from Kex */ 554 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 555 fatal("%s: conversion of newkeys failed", __func__); 556 557 buffer_put_string(&m, blob, bloblen); 558 xfree(blob); 559 560 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 561 fatal("%s: conversion of newkeys failed", __func__); 562 563 buffer_put_string(&m, blob, bloblen); 564 xfree(blob); 565 566 buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); 567 buffer_put_int(&m, packet_get_seqnr(MODE_IN)); 568 569 debug3("%s: New keys have been sent", __func__); 570 skip: 571 /* More key context */ 572 plen = packet_get_keycontext(MODE_OUT, NULL); 573 p = xmalloc(plen+1); 574 packet_get_keycontext(MODE_OUT, p); 575 buffer_put_string(&m, p, plen); 576 xfree(p); 577 578 plen = packet_get_keycontext(MODE_IN, NULL); 579 p = xmalloc(plen+1); 580 packet_get_keycontext(MODE_IN, p); 581 buffer_put_string(&m, p, plen); 582 xfree(p); 583 584 /* Compression state */ 585 debug3("%s: Sending compression state", __func__); 586 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 587 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 588 589 /* Network I/O buffers */ 590 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 591 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 592 593 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 594 debug3("%s: Finished sending state", __func__); 595 596 buffer_free(&m); 597} 598 599int 600mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) 601{ 602 Buffer m; 603 u_char *p; 604 int success = 0; 605 606 buffer_init(&m); 607 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 608 609 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 610 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 611 612 success = buffer_get_int(&m); 613 if (success == 0) { 614 debug3("%s: pty alloc failed", __func__); 615 buffer_free(&m); 616 return (0); 617 } 618 p = buffer_get_string(&m, NULL); 619 buffer_free(&m); 620 621 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 622 xfree(p); 623 624 *ptyfd = mm_receive_fd(pmonitor->m_recvfd); 625 *ttyfd = mm_receive_fd(pmonitor->m_recvfd); 626 627 /* Success */ 628 return (1); 629} 630 631void 632mm_session_pty_cleanup2(void *session) 633{ 634 Session *s = session; 635 Buffer m; 636 637 if (s->ttyfd == -1) 638 return; 639 buffer_init(&m); 640 buffer_put_cstring(&m, s->tty); 641 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 642 buffer_free(&m); 643 644 /* closed dup'ed master */ 645 if (close(s->ptymaster) < 0) 646 error("close(s->ptymaster): %s", strerror(errno)); 647 648 /* unlink pty from session */ 649 s->ttyfd = -1; 650} 651 652#ifdef USE_PAM 653void 654mm_start_pam(char *user) 655{ 656 Buffer m; 657 658 debug3("%s entering", __func__); 659 660 buffer_init(&m); 661 buffer_put_cstring(&m, user); 662 663 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 664 665 buffer_free(&m); 666} 667#endif /* USE_PAM */ 668 669/* Request process termination */ 670 671void 672mm_terminate(void) 673{ 674 Buffer m; 675 676 buffer_init(&m); 677 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 678 buffer_free(&m); 679} 680 681int 682mm_ssh1_session_key(BIGNUM *num) 683{ 684 int rsafail; 685 Buffer m; 686 687 buffer_init(&m); 688 buffer_put_bignum2(&m, num); 689 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 690 691 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 692 693 rsafail = buffer_get_int(&m); 694 buffer_get_bignum2(&m, num); 695 696 buffer_free(&m); 697 698 return (rsafail); 699} 700 701static void 702mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 703 char ***prompts, u_int **echo_on) 704{ 705 *name = xstrdup(""); 706 *infotxt = xstrdup(""); 707 *numprompts = 1; 708 *prompts = xmalloc(*numprompts * sizeof(char*)); 709 *echo_on = xmalloc(*numprompts * sizeof(u_int)); 710 (*echo_on)[0] = 0; 711} 712 713int 714mm_bsdauth_query(void *ctx, char **name, char **infotxt, 715 u_int *numprompts, char ***prompts, u_int **echo_on) 716{ 717 Buffer m; 718 int res; 719 char *challenge; 720 721 debug3("%s: entering", __func__); 722 723 buffer_init(&m); 724 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 725 726 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 727 &m); 728 res = buffer_get_int(&m); 729 if (res == -1) { 730 debug3("%s: no challenge", __func__); 731 buffer_free(&m); 732 return (-1); 733 } 734 735 /* Get the challenge, and format the response */ 736 challenge = buffer_get_string(&m, NULL); 737 buffer_free(&m); 738 739 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 740 (*prompts)[0] = challenge; 741 742 debug3("%s: received challenge: %s", __func__, challenge); 743 744 return (0); 745} 746 747int 748mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 749{ 750 Buffer m; 751 int authok; 752 753 debug3("%s: entering", __func__); 754 if (numresponses != 1) 755 return (-1); 756 757 buffer_init(&m); 758 buffer_put_cstring(&m, responses[0]); 759 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 760 761 mm_request_receive_expect(pmonitor->m_recvfd, 762 MONITOR_ANS_BSDAUTHRESPOND, &m); 763 764 authok = buffer_get_int(&m); 765 buffer_free(&m); 766 767 return ((authok == 0) ? -1 : 0); 768} 769 770#ifdef SKEY 771int 772mm_skey_query(void *ctx, char **name, char **infotxt, 773 u_int *numprompts, char ***prompts, u_int **echo_on) 774{ 775 Buffer m; 776 int len, res; 777 char *p, *challenge; 778 779 debug3("%s: entering", __func__); 780 781 buffer_init(&m); 782 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 783 784 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 785 &m); 786 res = buffer_get_int(&m); 787 if (res == -1) { 788 debug3("%s: no challenge", __func__); 789 buffer_free(&m); 790 return (-1); 791 } 792 793 /* Get the challenge, and format the response */ 794 challenge = buffer_get_string(&m, NULL); 795 buffer_free(&m); 796 797 debug3("%s: received challenge: %s", __func__, challenge); 798 799 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 800 801 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; 802 p = xmalloc(len); 803 strlcpy(p, challenge, len); 804 strlcat(p, SKEY_PROMPT, len); 805 (*prompts)[0] = p; 806 xfree(challenge); 807 808 return (0); 809} 810 811int 812mm_skey_respond(void *ctx, u_int numresponses, char **responses) 813{ 814 Buffer m; 815 int authok; 816 817 debug3("%s: entering", __func__); 818 if (numresponses != 1) 819 return (-1); 820 821 buffer_init(&m); 822 buffer_put_cstring(&m, responses[0]); 823 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 824 825 mm_request_receive_expect(pmonitor->m_recvfd, 826 MONITOR_ANS_SKEYRESPOND, &m); 827 828 authok = buffer_get_int(&m); 829 buffer_free(&m); 830 831 return ((authok == 0) ? -1 : 0); 832} 833#endif 834 835void 836mm_ssh1_session_id(u_char session_id[16]) 837{ 838 Buffer m; 839 int i; 840 841 debug3("%s entering", __func__); 842 843 buffer_init(&m); 844 for (i = 0; i < 16; i++) 845 buffer_put_char(&m, session_id[i]); 846 847 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 848 buffer_free(&m); 849} 850 851int 852mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 853{ 854 Buffer m; 855 Key *key; 856 u_char *blob; 857 u_int blen; 858 int allowed = 0; 859 860 debug3("%s entering", __func__); 861 862 buffer_init(&m); 863 buffer_put_bignum2(&m, client_n); 864 865 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 866 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 867 868 allowed = buffer_get_int(&m); 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 883BIGNUM * 884mm_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 914int 915mm_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