monitor_wrap.c revision 98675
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 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 208char* 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 228void 229mm_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 */ 245int 246mm_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 269int 270mm_user_key_allowed(struct passwd *pw, Key *key) 271{ 272 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 273} 274 275int 276mm_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 282int 283mm_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 294static void 295mm_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 307int 308mm_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 349int 350mm_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 */ 382Newkeys * 383mm_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 %d != %d", __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: %d > %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 %d", len); 438 buffer_free(&b); 439 return (newkey); 440} 441 442int 443mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 444{ 445 Buffer b; 446 int len; 447 u_char *buf; 448 Enc *enc; 449 Mac *mac; 450 Comp *comp; 451 Newkeys *newkey = newkeys[mode]; 452 453 debug3("%s: converting %p", __func__, newkey); 454 455 if (newkey == NULL) { 456 error("%s: newkey == NULL", __func__); 457 return 0; 458 } 459 enc = &newkey->enc; 460 mac = &newkey->mac; 461 comp = &newkey->comp; 462 463 buffer_init(&b); 464 /* Enc structure */ 465 buffer_put_cstring(&b, enc->name); 466 /* The cipher struct is constant and shared, you export pointer */ 467 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 468 buffer_put_int(&b, enc->enabled); 469 buffer_put_int(&b, enc->block_size); 470 buffer_put_string(&b, enc->key, enc->key_len); 471 packet_get_keyiv(mode, enc->iv, enc->block_size); 472 buffer_put_string(&b, enc->iv, enc->block_size); 473 474 /* Mac structure */ 475 buffer_put_cstring(&b, mac->name); 476 buffer_put_int(&b, mac->enabled); 477 buffer_put_string(&b, mac->key, mac->key_len); 478 479 /* Comp structure */ 480 buffer_put_int(&b, comp->type); 481 buffer_put_int(&b, comp->enabled); 482 buffer_put_cstring(&b, comp->name); 483 484 len = buffer_len(&b); 485 buf = xmalloc(len); 486 memcpy(buf, buffer_ptr(&b), len); 487 memset(buffer_ptr(&b), 0, len); 488 buffer_free(&b); 489 if (lenp != NULL) 490 *lenp = len; 491 if (blobp != NULL) 492 *blobp = buf; 493 return len; 494} 495 496static void 497mm_send_kex(Buffer *m, Kex *kex) 498{ 499 buffer_put_string(m, kex->session_id, kex->session_id_len); 500 buffer_put_int(m, kex->we_need); 501 buffer_put_int(m, kex->hostkey_type); 502 buffer_put_int(m, kex->kex_type); 503 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 504 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 505 buffer_put_int(m, kex->flags); 506 buffer_put_cstring(m, kex->client_version_string); 507 buffer_put_cstring(m, kex->server_version_string); 508} 509 510void 511mm_send_keystate(struct monitor *pmonitor) 512{ 513 Buffer m; 514 u_char *blob, *p; 515 u_int bloblen, plen; 516 517 buffer_init(&m); 518 519 if (!compat20) { 520 u_char iv[24]; 521 u_char *key; 522 u_int ivlen, keylen; 523 524 buffer_put_int(&m, packet_get_protocol_flags()); 525 526 buffer_put_int(&m, packet_get_ssh1_cipher()); 527 528 debug3("%s: Sending ssh1 KEY+IV", __func__); 529 keylen = packet_get_encryption_key(NULL); 530 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 531 keylen = packet_get_encryption_key(key); 532 buffer_put_string(&m, key, keylen); 533 memset(key, 0, keylen); 534 xfree(key); 535 536 ivlen = packet_get_keyiv_len(MODE_OUT); 537 packet_get_keyiv(MODE_OUT, iv, ivlen); 538 buffer_put_string(&m, iv, ivlen); 539 ivlen = packet_get_keyiv_len(MODE_OUT); 540 packet_get_keyiv(MODE_IN, iv, ivlen); 541 buffer_put_string(&m, iv, ivlen); 542 goto skip; 543 } else { 544 /* Kex for rekeying */ 545 mm_send_kex(&m, *pmonitor->m_pkex); 546 } 547 548 debug3("%s: Sending new keys: %p %p", 549 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 550 551 /* Keys from Kex */ 552 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 553 fatal("%s: conversion of newkeys failed", __func__); 554 555 buffer_put_string(&m, blob, bloblen); 556 xfree(blob); 557 558 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 559 fatal("%s: conversion of newkeys failed", __func__); 560 561 buffer_put_string(&m, blob, bloblen); 562 xfree(blob); 563 564 buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); 565 buffer_put_int(&m, packet_get_seqnr(MODE_IN)); 566 567 debug3("%s: New keys have been sent", __func__); 568 skip: 569 /* More key context */ 570 plen = packet_get_keycontext(MODE_OUT, NULL); 571 p = xmalloc(plen+1); 572 packet_get_keycontext(MODE_OUT, p); 573 buffer_put_string(&m, p, plen); 574 xfree(p); 575 576 plen = packet_get_keycontext(MODE_IN, NULL); 577 p = xmalloc(plen+1); 578 packet_get_keycontext(MODE_IN, p); 579 buffer_put_string(&m, p, plen); 580 xfree(p); 581 582 /* Compression state */ 583 debug3("%s: Sending compression state", __func__); 584 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 585 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 586 587 /* Network I/O buffers */ 588 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 589 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 590 591 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 592 debug3("%s: Finished sending state", __func__); 593 594 buffer_free(&m); 595} 596 597int 598mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) 599{ 600 Buffer m; 601 u_char *p; 602 int success = 0; 603 604 buffer_init(&m); 605 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 606 607 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 608 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 609 610 success = buffer_get_int(&m); 611 if (success == 0) { 612 debug3("%s: pty alloc failed", __func__); 613 buffer_free(&m); 614 return (0); 615 } 616 p = buffer_get_string(&m, NULL); 617 buffer_free(&m); 618 619 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 620 xfree(p); 621 622 *ptyfd = mm_receive_fd(pmonitor->m_recvfd); 623 *ttyfd = mm_receive_fd(pmonitor->m_recvfd); 624 625 /* Success */ 626 return (1); 627} 628 629void 630mm_session_pty_cleanup2(void *session) 631{ 632 Session *s = session; 633 Buffer m; 634 635 if (s->ttyfd == -1) 636 return; 637 buffer_init(&m); 638 buffer_put_cstring(&m, s->tty); 639 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 640 buffer_free(&m); 641 642 /* closed dup'ed master */ 643 if (close(s->ptymaster) < 0) 644 error("close(s->ptymaster): %s", strerror(errno)); 645 646 /* unlink pty from session */ 647 s->ttyfd = -1; 648} 649 650/* Request process termination */ 651 652void 653mm_terminate(void) 654{ 655 Buffer m; 656 657 buffer_init(&m); 658 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 659 buffer_free(&m); 660} 661 662int 663mm_ssh1_session_key(BIGNUM *num) 664{ 665 int rsafail; 666 Buffer m; 667 668 buffer_init(&m); 669 buffer_put_bignum2(&m, num); 670 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 671 672 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 673 674 rsafail = buffer_get_int(&m); 675 buffer_get_bignum2(&m, num); 676 677 buffer_free(&m); 678 679 return (rsafail); 680} 681 682static void 683mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 684 char ***prompts, u_int **echo_on) 685{ 686 *name = xstrdup(""); 687 *infotxt = xstrdup(""); 688 *numprompts = 1; 689 *prompts = xmalloc(*numprompts * sizeof(char*)); 690 *echo_on = xmalloc(*numprompts * sizeof(u_int)); 691 (*echo_on)[0] = 0; 692} 693 694int 695mm_bsdauth_query(void *ctx, char **name, char **infotxt, 696 u_int *numprompts, char ***prompts, u_int **echo_on) 697{ 698 Buffer m; 699 int res; 700 char *challenge; 701 702 debug3("%s: entering", __func__); 703 704 buffer_init(&m); 705 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 706 707 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 708 &m); 709 res = buffer_get_int(&m); 710 if (res == -1) { 711 debug3("%s: no challenge", __func__); 712 buffer_free(&m); 713 return (-1); 714 } 715 716 /* Get the challenge, and format the response */ 717 challenge = buffer_get_string(&m, NULL); 718 buffer_free(&m); 719 720 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 721 (*prompts)[0] = challenge; 722 723 debug3("%s: received challenge: %s", __func__, challenge); 724 725 return (0); 726} 727 728int 729mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 730{ 731 Buffer m; 732 int authok; 733 734 debug3("%s: entering", __func__); 735 if (numresponses != 1) 736 return (-1); 737 738 buffer_init(&m); 739 buffer_put_cstring(&m, responses[0]); 740 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 741 742 mm_request_receive_expect(pmonitor->m_recvfd, 743 MONITOR_ANS_BSDAUTHRESPOND, &m); 744 745 authok = buffer_get_int(&m); 746 buffer_free(&m); 747 748 return ((authok == 0) ? -1 : 0); 749} 750 751int 752mm_skey_query(void *ctx, char **name, char **infotxt, 753 u_int *numprompts, char ***prompts, u_int **echo_on) 754{ 755 Buffer m; 756 int len, res; 757 char *p, *challenge; 758 759 debug3("%s: entering", __func__); 760 761 buffer_init(&m); 762 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 763 764 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 765 &m); 766 res = buffer_get_int(&m); 767 if (res == -1) { 768 debug3("%s: no challenge", __func__); 769 buffer_free(&m); 770 return (-1); 771 } 772 773 /* Get the challenge, and format the response */ 774 challenge = buffer_get_string(&m, NULL); 775 buffer_free(&m); 776 777 debug3("%s: received challenge: %s", __func__, challenge); 778 779 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 780 781 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; 782 p = xmalloc(len); 783 strlcpy(p, challenge, len); 784 strlcat(p, SKEY_PROMPT, len); 785 (*prompts)[0] = p; 786 xfree(challenge); 787 788 return (0); 789} 790 791int 792mm_skey_respond(void *ctx, u_int numresponses, char **responses) 793{ 794 Buffer m; 795 int authok; 796 797 debug3("%s: entering", __func__); 798 if (numresponses != 1) 799 return (-1); 800 801 buffer_init(&m); 802 buffer_put_cstring(&m, responses[0]); 803 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 804 805 mm_request_receive_expect(pmonitor->m_recvfd, 806 MONITOR_ANS_SKEYRESPOND, &m); 807 808 authok = buffer_get_int(&m); 809 buffer_free(&m); 810 811 return ((authok == 0) ? -1 : 0); 812} 813 814void 815mm_ssh1_session_id(u_char session_id[16]) 816{ 817 Buffer m; 818 int i; 819 820 debug3("%s entering", __func__); 821 822 buffer_init(&m); 823 for (i = 0; i < 16; i++) 824 buffer_put_char(&m, session_id[i]); 825 826 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 827 buffer_free(&m); 828} 829 830int 831mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 832{ 833 Buffer m; 834 Key *key; 835 u_char *blob; 836 u_int blen; 837 int allowed = 0; 838 839 debug3("%s entering", __func__); 840 841 buffer_init(&m); 842 buffer_put_bignum2(&m, client_n); 843 844 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 845 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 846 847 allowed = buffer_get_int(&m); 848 849 if (allowed && rkey != NULL) { 850 blob = buffer_get_string(&m, &blen); 851 if ((key = key_from_blob(blob, blen)) == NULL) 852 fatal("%s: key_from_blob failed", __func__); 853 *rkey = key; 854 xfree(blob); 855 } 856 mm_send_debug(&m); 857 buffer_free(&m); 858 859 return (allowed); 860} 861 862BIGNUM * 863mm_auth_rsa_generate_challenge(Key *key) 864{ 865 Buffer m; 866 BIGNUM *challenge; 867 u_char *blob; 868 u_int blen; 869 870 debug3("%s entering", __func__); 871 872 if ((challenge = BN_new()) == NULL) 873 fatal("%s: BN_new failed", __func__); 874 875 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 876 if (key_to_blob(key, &blob, &blen) == 0) 877 fatal("%s: key_to_blob failed", __func__); 878 key->type = KEY_RSA1; 879 880 buffer_init(&m); 881 buffer_put_string(&m, blob, blen); 882 xfree(blob); 883 884 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 885 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 886 887 buffer_get_bignum2(&m, challenge); 888 buffer_free(&m); 889 890 return (challenge); 891} 892 893int 894mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 895{ 896 Buffer m; 897 u_char *blob; 898 u_int blen; 899 int success = 0; 900 901 debug3("%s entering", __func__); 902 903 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 904 if (key_to_blob(key, &blob, &blen) == 0) 905 fatal("%s: key_to_blob failed", __func__); 906 key->type = KEY_RSA1; 907 908 buffer_init(&m); 909 buffer_put_string(&m, blob, blen); 910 buffer_put_string(&m, response, 16); 911 xfree(blob); 912 913 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 914 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 915 916 success = buffer_get_int(&m); 917 buffer_free(&m); 918 919 return (success); 920} 921