monitor_wrap.c revision 99052
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 $"); 29RCSID("$FreeBSD: head/crypto/openssh/monitor_wrap.c 99052 2002-06-29 10:56:23Z des $"); 30 31#include <openssl/bn.h> 32#include <openssl/dh.h> 33 34#include "ssh.h" 35#include "dh.h" 36#include "kex.h" 37#include "auth.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 */ 56extern int compat20; 57extern Newkeys *newkeys[]; 58extern z_stream incoming_stream; 59extern z_stream outgoing_stream; 60extern struct monitor *pmonitor; 61extern Buffer input, output; 62 63void 64mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) 65{ 66 u_char buf[5]; 67 u_int mlen = buffer_len(m); 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(write, socket, buf, sizeof(buf)) != sizeof(buf)) 74 fatal("%s: write", __func__); 75 if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen) 76 fatal("%s: write", __func__); 77} 78 79void 80mm_request_receive(int socket, Buffer *m) 81{ 82 u_char buf[4]; 83 ssize_t res; 84 u_int msg_len; 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 104void 105mm_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 118DH * 119mm_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 152int 153mm_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 174struct passwd * 175mm_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#ifdef HAVE_PW_CLASS_IN_PASSWD 202 pw->pw_class = buffer_get_string(&m, NULL); 203#endif 204 pw->pw_dir = buffer_get_string(&m, NULL); 205 pw->pw_shell = buffer_get_string(&m, NULL); 206 buffer_free(&m); 207 208 return (pw); 209} 210 211char* mm_auth2_read_banner(void) 212{ 213 Buffer m; 214 char *banner; 215 216 debug3("%s entering", __func__); 217 218 buffer_init(&m); 219 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 220 buffer_clear(&m); 221 222 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m); 223 banner = buffer_get_string(&m, NULL); 224 buffer_free(&m); 225 226 return (banner); 227} 228 229/* Inform the privileged process about service and style */ 230 231void 232mm_inform_authserv(char *service, char *style) 233{ 234 Buffer m; 235 236 debug3("%s entering", __func__); 237 238 buffer_init(&m); 239 buffer_put_cstring(&m, service); 240 buffer_put_cstring(&m, style ? style : ""); 241 242 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 243 244 buffer_free(&m); 245} 246 247/* Do the password authentication */ 248int 249mm_auth_password(Authctxt *authctxt, char *password) 250{ 251 Buffer m; 252 int authenticated = 0; 253 254 debug3("%s entering", __func__); 255 256 buffer_init(&m); 257 buffer_put_cstring(&m, password); 258 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 259 260 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 261 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 262 263 authenticated = buffer_get_int(&m); 264 265 buffer_free(&m); 266 267 debug3("%s: user %sauthenticated", 268 __func__, authenticated ? "" : "not "); 269 return (authenticated); 270} 271 272int 273mm_user_key_allowed(struct passwd *pw, Key *key) 274{ 275 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 276} 277 278int 279mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 280 Key *key) 281{ 282 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 283} 284 285int 286mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 287 char *host, Key *key) 288{ 289 int ret; 290 291 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 292 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 293 key->type = KEY_RSA1; 294 return (ret); 295} 296 297static void 298mm_send_debug(Buffer *m) 299{ 300 char *msg; 301 302 while (buffer_len(m)) { 303 msg = buffer_get_string(m, NULL); 304 debug3("%s: Sending debug: %s", __func__, msg); 305 packet_send_debug("%s", msg); 306 xfree(msg); 307 } 308} 309 310int 311mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 312{ 313 Buffer m; 314 u_char *blob; 315 u_int len; 316 int allowed = 0; 317 318 debug3("%s entering", __func__); 319 320 /* Convert the key to a blob and the pass it over */ 321 if (!key_to_blob(key, &blob, &len)) 322 return (0); 323 324 buffer_init(&m); 325 buffer_put_int(&m, type); 326 buffer_put_cstring(&m, user ? user : ""); 327 buffer_put_cstring(&m, host ? host : ""); 328 buffer_put_string(&m, blob, len); 329 xfree(blob); 330 331 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 332 333 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 334 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 335 336 allowed = buffer_get_int(&m); 337 338 /* Send potential debug messages */ 339 mm_send_debug(&m); 340 341 buffer_free(&m); 342 343 return (allowed); 344} 345 346/* 347 * This key verify needs to send the key type along, because the 348 * privileged parent makes the decision if the key is allowed 349 * for authentication. 350 */ 351 352int 353mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 354{ 355 Buffer m; 356 u_char *blob; 357 u_int len; 358 int verified = 0; 359 360 debug3("%s entering", __func__); 361 362 /* Convert the key to a blob and the pass it over */ 363 if (!key_to_blob(key, &blob, &len)) 364 return (0); 365 366 buffer_init(&m); 367 buffer_put_string(&m, blob, len); 368 buffer_put_string(&m, sig, siglen); 369 buffer_put_string(&m, data, datalen); 370 xfree(blob); 371 372 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 373 374 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 375 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 376 377 verified = buffer_get_int(&m); 378 379 buffer_free(&m); 380 381 return (verified); 382} 383 384/* Export key state after authentication */ 385Newkeys * 386mm_newkeys_from_blob(u_char *blob, int blen) 387{ 388 Buffer b; 389 u_int len; 390 Newkeys *newkey = NULL; 391 Enc *enc; 392 Mac *mac; 393 Comp *comp; 394 395 debug3("%s: %p(%d)", __func__, blob, blen); 396#ifdef DEBUG_PK 397 dump_base64(stderr, blob, blen); 398#endif 399 buffer_init(&b); 400 buffer_append(&b, blob, blen); 401 402 newkey = xmalloc(sizeof(*newkey)); 403 enc = &newkey->enc; 404 mac = &newkey->mac; 405 comp = &newkey->comp; 406 407 /* Enc structure */ 408 enc->name = buffer_get_string(&b, NULL); 409 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 410 enc->enabled = buffer_get_int(&b); 411 enc->block_size = buffer_get_int(&b); 412 enc->key = buffer_get_string(&b, &enc->key_len); 413 enc->iv = buffer_get_string(&b, &len); 414 if (len != enc->block_size) 415 fatal("%s: bad ivlen: expected %d != %d", __func__, 416 enc->block_size, len); 417 418 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 419 fatal("%s: bad cipher name %s or pointer %p", __func__, 420 enc->name, enc->cipher); 421 422 /* Mac structure */ 423 mac->name = buffer_get_string(&b, NULL); 424 if (mac->name == NULL || mac_init(mac, mac->name) == -1) 425 fatal("%s: can not init mac %s", __func__, mac->name); 426 mac->enabled = buffer_get_int(&b); 427 mac->key = buffer_get_string(&b, &len); 428 if (len > mac->key_len) 429 fatal("%s: bad mac key length: %d > %d", __func__, len, 430 mac->key_len); 431 mac->key_len = len; 432 433 /* Comp structure */ 434 comp->type = buffer_get_int(&b); 435 comp->enabled = buffer_get_int(&b); 436 comp->name = buffer_get_string(&b, NULL); 437 438 len = buffer_len(&b); 439 if (len != 0) 440 error("newkeys_from_blob: remaining bytes in blob %d", len); 441 buffer_free(&b); 442 return (newkey); 443} 444 445int 446mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 447{ 448 Buffer b; 449 int len; 450 u_char *buf; 451 Enc *enc; 452 Mac *mac; 453 Comp *comp; 454 Newkeys *newkey = newkeys[mode]; 455 456 debug3("%s: converting %p", __func__, newkey); 457 458 if (newkey == NULL) { 459 error("%s: newkey == NULL", __func__); 460 return 0; 461 } 462 enc = &newkey->enc; 463 mac = &newkey->mac; 464 comp = &newkey->comp; 465 466 buffer_init(&b); 467 /* Enc structure */ 468 buffer_put_cstring(&b, enc->name); 469 /* The cipher struct is constant and shared, you export pointer */ 470 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 471 buffer_put_int(&b, enc->enabled); 472 buffer_put_int(&b, enc->block_size); 473 buffer_put_string(&b, enc->key, enc->key_len); 474 packet_get_keyiv(mode, enc->iv, enc->block_size); 475 buffer_put_string(&b, enc->iv, enc->block_size); 476 477 /* Mac structure */ 478 buffer_put_cstring(&b, mac->name); 479 buffer_put_int(&b, mac->enabled); 480 buffer_put_string(&b, mac->key, mac->key_len); 481 482 /* Comp structure */ 483 buffer_put_int(&b, comp->type); 484 buffer_put_int(&b, comp->enabled); 485 buffer_put_cstring(&b, comp->name); 486 487 len = buffer_len(&b); 488 buf = xmalloc(len); 489 memcpy(buf, buffer_ptr(&b), len); 490 memset(buffer_ptr(&b), 0, len); 491 buffer_free(&b); 492 if (lenp != NULL) 493 *lenp = len; 494 if (blobp != NULL) 495 *blobp = buf; 496 return len; 497} 498 499static void 500mm_send_kex(Buffer *m, Kex *kex) 501{ 502 buffer_put_string(m, kex->session_id, kex->session_id_len); 503 buffer_put_int(m, kex->we_need); 504 buffer_put_int(m, kex->hostkey_type); 505 buffer_put_int(m, kex->kex_type); 506 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 507 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 508 buffer_put_int(m, kex->flags); 509 buffer_put_cstring(m, kex->client_version_string); 510 buffer_put_cstring(m, kex->server_version_string); 511} 512 513void 514mm_send_keystate(struct monitor *pmonitor) 515{ 516 Buffer m; 517 u_char *blob, *p; 518 u_int bloblen, plen; 519 520 buffer_init(&m); 521 522 if (!compat20) { 523 u_char iv[24]; 524 u_char *key; 525 u_int ivlen, keylen; 526 527 buffer_put_int(&m, packet_get_protocol_flags()); 528 529 buffer_put_int(&m, packet_get_ssh1_cipher()); 530 531 debug3("%s: Sending ssh1 KEY+IV", __func__); 532 keylen = packet_get_encryption_key(NULL); 533 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 534 keylen = packet_get_encryption_key(key); 535 buffer_put_string(&m, key, keylen); 536 memset(key, 0, keylen); 537 xfree(key); 538 539 ivlen = packet_get_keyiv_len(MODE_OUT); 540 packet_get_keyiv(MODE_OUT, iv, ivlen); 541 buffer_put_string(&m, iv, ivlen); 542 ivlen = packet_get_keyiv_len(MODE_OUT); 543 packet_get_keyiv(MODE_IN, iv, ivlen); 544 buffer_put_string(&m, iv, ivlen); 545 goto skip; 546 } else { 547 /* Kex for rekeying */ 548 mm_send_kex(&m, *pmonitor->m_pkex); 549 } 550 551 debug3("%s: Sending new keys: %p %p", 552 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 553 554 /* Keys from Kex */ 555 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 556 fatal("%s: conversion of newkeys failed", __func__); 557 558 buffer_put_string(&m, blob, bloblen); 559 xfree(blob); 560 561 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 562 fatal("%s: conversion of newkeys failed", __func__); 563 564 buffer_put_string(&m, blob, bloblen); 565 xfree(blob); 566 567 buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); 568 buffer_put_int(&m, packet_get_seqnr(MODE_IN)); 569 570 debug3("%s: New keys have been sent", __func__); 571 skip: 572 /* More key context */ 573 plen = packet_get_keycontext(MODE_OUT, NULL); 574 p = xmalloc(plen+1); 575 packet_get_keycontext(MODE_OUT, p); 576 buffer_put_string(&m, p, plen); 577 xfree(p); 578 579 plen = packet_get_keycontext(MODE_IN, NULL); 580 p = xmalloc(plen+1); 581 packet_get_keycontext(MODE_IN, p); 582 buffer_put_string(&m, p, plen); 583 xfree(p); 584 585 /* Compression state */ 586 debug3("%s: Sending compression state", __func__); 587 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 588 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 589 590 /* Network I/O buffers */ 591 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 592 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 593 594 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 595 debug3("%s: Finished sending state", __func__); 596 597 buffer_free(&m); 598} 599 600int 601mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) 602{ 603 Buffer m; 604 u_char *p; 605 int success = 0; 606 607 buffer_init(&m); 608 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 609 610 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 611 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 612 613 success = buffer_get_int(&m); 614 if (success == 0) { 615 debug3("%s: pty alloc failed", __func__); 616 buffer_free(&m); 617 return (0); 618 } 619 p = buffer_get_string(&m, NULL); 620 buffer_free(&m); 621 622 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 623 xfree(p); 624 625 *ptyfd = mm_receive_fd(pmonitor->m_recvfd); 626 *ttyfd = mm_receive_fd(pmonitor->m_recvfd); 627 628 /* Success */ 629 return (1); 630} 631 632void 633mm_session_pty_cleanup2(void *session) 634{ 635 Session *s = session; 636 Buffer m; 637 638 if (s->ttyfd == -1) 639 return; 640 buffer_init(&m); 641 buffer_put_cstring(&m, s->tty); 642 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 643 buffer_free(&m); 644 645 /* closed dup'ed master */ 646 if (close(s->ptymaster) < 0) 647 error("close(s->ptymaster): %s", strerror(errno)); 648 649 /* unlink pty from session */ 650 s->ttyfd = -1; 651} 652 653#ifdef USE_PAM 654void 655mm_start_pam(char *user) 656{ 657 Buffer m; 658 659 debug3("%s entering", __func__); 660 661 buffer_init(&m); 662 buffer_put_cstring(&m, user); 663 664 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 665 666 buffer_free(&m); 667} 668 669void * 670mm_pam_init_ctx(Authctxt *authctxt) 671{ 672 Buffer m; 673 int success; 674 675 debug3("%s", __func__); 676 buffer_init(&m); 677 buffer_put_cstring(&m, authctxt->user); 678 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 679 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 680 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 681 success = buffer_get_int(&m); 682 if (success == 0) { 683 debug3("%s: pam_init_ctx failed", __func__); 684 buffer_free(&m); 685 return (NULL); 686 } 687 buffer_free(&m); 688 return (authctxt); 689} 690 691int 692mm_pam_query(void *ctx, char **name, char **info, 693 u_int *num, char ***prompts, u_int **echo_on) 694{ 695 Buffer m; 696 int i, ret; 697 698 debug3("%s", __func__); 699 buffer_init(&m); 700 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 701 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 702 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 703 ret = buffer_get_int(&m); 704 debug3("%s: pam_query returned %d", __func__, ret); 705 *name = buffer_get_string(&m, NULL); 706 *info = buffer_get_string(&m, NULL); 707 *num = buffer_get_int(&m); 708 *prompts = xmalloc((*num + 1) * sizeof(char *)); 709 *echo_on = xmalloc((*num + 1) * sizeof(u_int)); 710 for (i = 0; i < *num; ++i) { 711 (*prompts)[i] = buffer_get_string(&m, NULL); 712 (*echo_on)[i] = buffer_get_int(&m); 713 } 714 buffer_free(&m); 715 return (ret); 716} 717 718int 719mm_pam_respond(void *ctx, u_int num, char **resp) 720{ 721 Buffer m; 722 int i, ret; 723 724 debug3("%s", __func__); 725 buffer_init(&m); 726 buffer_put_int(&m, num); 727 for (i = 0; i < num; ++i) 728 buffer_put_cstring(&m, resp[i]); 729 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 730 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 731 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 732 ret = buffer_get_int(&m); 733 debug3("%s: pam_respond returned %d", __func__, ret); 734 buffer_free(&m); 735 return (ret); 736} 737 738void 739mm_pam_free_ctx(void *ctxtp) 740{ 741 Buffer m; 742 743 debug3("%s", __func__); 744 buffer_init(&m); 745 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 746 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 747 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 748 buffer_free(&m); 749} 750#endif /* USE_PAM */ 751 752/* Request process termination */ 753 754void 755mm_terminate(void) 756{ 757 Buffer m; 758 759 buffer_init(&m); 760 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 761 buffer_free(&m); 762} 763 764int 765mm_ssh1_session_key(BIGNUM *num) 766{ 767 int rsafail; 768 Buffer m; 769 770 buffer_init(&m); 771 buffer_put_bignum2(&m, num); 772 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 773 774 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 775 776 rsafail = buffer_get_int(&m); 777 buffer_get_bignum2(&m, num); 778 779 buffer_free(&m); 780 781 return (rsafail); 782} 783 784static void 785mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 786 char ***prompts, u_int **echo_on) 787{ 788 *name = xstrdup(""); 789 *infotxt = xstrdup(""); 790 *numprompts = 1; 791 *prompts = xmalloc(*numprompts * sizeof(char*)); 792 *echo_on = xmalloc(*numprompts * sizeof(u_int)); 793 (*echo_on)[0] = 0; 794} 795 796int 797mm_bsdauth_query(void *ctx, char **name, char **infotxt, 798 u_int *numprompts, char ***prompts, u_int **echo_on) 799{ 800 Buffer m; 801 int res; 802 char *challenge; 803 804 debug3("%s: entering", __func__); 805 806 buffer_init(&m); 807 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 808 809 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 810 &m); 811 res = buffer_get_int(&m); 812 if (res == -1) { 813 debug3("%s: no challenge", __func__); 814 buffer_free(&m); 815 return (-1); 816 } 817 818 /* Get the challenge, and format the response */ 819 challenge = buffer_get_string(&m, NULL); 820 buffer_free(&m); 821 822 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 823 (*prompts)[0] = challenge; 824 825 debug3("%s: received challenge: %s", __func__, challenge); 826 827 return (0); 828} 829 830int 831mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 832{ 833 Buffer m; 834 int authok; 835 836 debug3("%s: entering", __func__); 837 if (numresponses != 1) 838 return (-1); 839 840 buffer_init(&m); 841 buffer_put_cstring(&m, responses[0]); 842 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 843 844 mm_request_receive_expect(pmonitor->m_recvfd, 845 MONITOR_ANS_BSDAUTHRESPOND, &m); 846 847 authok = buffer_get_int(&m); 848 buffer_free(&m); 849 850 return ((authok == 0) ? -1 : 0); 851} 852 853#ifdef SKEY 854int 855mm_skey_query(void *ctx, char **name, char **infotxt, 856 u_int *numprompts, char ***prompts, u_int **echo_on) 857{ 858 Buffer m; 859 int len, res; 860 char *p, *challenge; 861 862 debug3("%s: entering", __func__); 863 864 buffer_init(&m); 865 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 866 867 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 868 &m); 869 res = buffer_get_int(&m); 870 if (res == -1) { 871 debug3("%s: no challenge", __func__); 872 buffer_free(&m); 873 return (-1); 874 } 875 876 /* Get the challenge, and format the response */ 877 challenge = buffer_get_string(&m, NULL); 878 buffer_free(&m); 879 880 debug3("%s: received challenge: %s", __func__, challenge); 881 882 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 883 884 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; 885 p = xmalloc(len); 886 strlcpy(p, challenge, len); 887 strlcat(p, SKEY_PROMPT, len); 888 (*prompts)[0] = p; 889 xfree(challenge); 890 891 return (0); 892} 893 894int 895mm_skey_respond(void *ctx, u_int numresponses, char **responses) 896{ 897 Buffer m; 898 int authok; 899 900 debug3("%s: entering", __func__); 901 if (numresponses != 1) 902 return (-1); 903 904 buffer_init(&m); 905 buffer_put_cstring(&m, responses[0]); 906 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 907 908 mm_request_receive_expect(pmonitor->m_recvfd, 909 MONITOR_ANS_SKEYRESPOND, &m); 910 911 authok = buffer_get_int(&m); 912 buffer_free(&m); 913 914 return ((authok == 0) ? -1 : 0); 915} 916#endif 917 918void 919mm_ssh1_session_id(u_char session_id[16]) 920{ 921 Buffer m; 922 int i; 923 924 debug3("%s entering", __func__); 925 926 buffer_init(&m); 927 for (i = 0; i < 16; i++) 928 buffer_put_char(&m, session_id[i]); 929 930 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 931 buffer_free(&m); 932} 933 934int 935mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 936{ 937 Buffer m; 938 Key *key; 939 u_char *blob; 940 u_int blen; 941 int allowed = 0; 942 943 debug3("%s entering", __func__); 944 945 buffer_init(&m); 946 buffer_put_bignum2(&m, client_n); 947 948 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 949 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 950 951 allowed = buffer_get_int(&m); 952 953 if (allowed && rkey != NULL) { 954 blob = buffer_get_string(&m, &blen); 955 if ((key = key_from_blob(blob, blen)) == NULL) 956 fatal("%s: key_from_blob failed", __func__); 957 *rkey = key; 958 xfree(blob); 959 } 960 mm_send_debug(&m); 961 buffer_free(&m); 962 963 return (allowed); 964} 965 966BIGNUM * 967mm_auth_rsa_generate_challenge(Key *key) 968{ 969 Buffer m; 970 BIGNUM *challenge; 971 u_char *blob; 972 u_int blen; 973 974 debug3("%s entering", __func__); 975 976 if ((challenge = BN_new()) == NULL) 977 fatal("%s: BN_new failed", __func__); 978 979 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 980 if (key_to_blob(key, &blob, &blen) == 0) 981 fatal("%s: key_to_blob failed", __func__); 982 key->type = KEY_RSA1; 983 984 buffer_init(&m); 985 buffer_put_string(&m, blob, blen); 986 xfree(blob); 987 988 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 989 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 990 991 buffer_get_bignum2(&m, challenge); 992 buffer_free(&m); 993 994 return (challenge); 995} 996 997int 998mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 999{ 1000 Buffer m; 1001 u_char *blob; 1002 u_int blen; 1003 int success = 0; 1004 1005 debug3("%s entering", __func__); 1006 1007 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1008 if (key_to_blob(key, &blob, &blen) == 0) 1009 fatal("%s: key_to_blob failed", __func__); 1010 key->type = KEY_RSA1; 1011 1012 buffer_init(&m); 1013 buffer_put_string(&m, blob, blen); 1014 buffer_put_string(&m, response, 16); 1015 xfree(blob); 1016 1017 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 1018 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 1019 1020 success = buffer_get_int(&m); 1021 buffer_free(&m); 1022 1023 return (success); 1024} 1025