1 /* $NetBSD: monitor_wrap.c,v 1.6 2011/09/07 17:49:19 christos Exp $ */ 2 /* $OpenBSD: monitor_wrap.c,v 1.73 2011/06/17 21:44:31 djm Exp $ */ 3 /* 4 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 5 * Copyright 2002 Markus Friedl <markus@openbsd.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "includes.h" 30 __RCSID("$NetBSD: monitor_wrap.c,v 1.6 2011/09/07 17:49:19 christos Exp $"); 31 #include <sys/types.h> 32 #include <sys/uio.h> 33 #include <sys/queue.h> 34 35 #include <errno.h> 36 #include <pwd.h> 37 #include <signal.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 #include <openssl/bn.h> 43 #include <openssl/dh.h> 44 #include <openssl/evp.h> 45 46 #include "xmalloc.h" 47 #include "ssh.h" 48 #include "dh.h" 49 #include "buffer.h" 50 #include "key.h" 51 #include "cipher.h" 52 #include "kex.h" 53 #include "hostfile.h" 54 #include "auth.h" 55 #include "auth-options.h" 56 #include "packet.h" 57 #include "mac.h" 58 #include "log.h" 59 #include <zlib.h> 60 #include "monitor.h" 61 #ifdef GSSAPI 62 #include "ssh-gss.h" 63 #endif 64 #include "monitor_wrap.h" 65 #include "atomicio.h" 66 #include "monitor_fdpass.h" 67 #ifdef USE_PAM 68 #include "servconf.h" 69 #include <security/pam_appl.h> 70 #endif 71 #include "misc.h" 72 #include "schnorr.h" 73 #include "jpake.h" 74 #include "uuencode.h" 75 76 #include "channels.h" 77 #include "session.h" 78 #include "servconf.h" 79 #include "roaming.h" 80 81 /* Imports */ 82 extern int compat20; 83 extern z_stream incoming_stream; 84 extern z_stream outgoing_stream; 85 extern struct monitor *pmonitor; 86 extern Buffer loginmsg; 87 extern ServerOptions options; 88 89 void 90 mm_log_handler(LogLevel level, const char *msg, void *ctx) 91 { 92 Buffer log_msg; 93 struct monitor *mon = (struct monitor *)ctx; 94 95 if (mon->m_log_sendfd == -1) 96 fatal("%s: no log channel", __func__); 97 98 buffer_init(&log_msg); 99 /* 100 * Placeholder for packet length. Will be filled in with the actual 101 * packet length once the packet has been constucted. This saves 102 * fragile math. 103 */ 104 buffer_put_int(&log_msg, 0); 105 106 buffer_put_int(&log_msg, level); 107 buffer_put_cstring(&log_msg, msg); 108 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); 109 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), 110 buffer_len(&log_msg)) != buffer_len(&log_msg)) 111 fatal("%s: write: %s", __func__, strerror(errno)); 112 buffer_free(&log_msg); 113 } 114 115 int 116 mm_is_monitor(void) 117 { 118 /* 119 * m_pid is only set in the privileged part, and 120 * points to the unprivileged child. 121 */ 122 return (pmonitor && pmonitor->m_pid > 0); 123 } 124 125 void 126 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 127 { 128 u_int mlen = buffer_len(m); 129 u_char buf[5]; 130 131 debug3("%s entering: type %d", __func__, type); 132 133 put_u32(buf, mlen + 1); 134 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 135 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 136 fatal("%s: write: %s", __func__, strerror(errno)); 137 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 138 fatal("%s: write: %s", __func__, strerror(errno)); 139 } 140 141 void 142 mm_request_receive(int sock, Buffer *m) 143 { 144 u_char buf[4]; 145 u_int msg_len; 146 147 debug3("%s entering", __func__); 148 149 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 150 if (errno == EPIPE) 151 cleanup_exit(255); 152 fatal("%s: read: %s", __func__, strerror(errno)); 153 } 154 msg_len = get_u32(buf); 155 if (msg_len > 256 * 1024) 156 fatal("%s: read: bad msg_len %d", __func__, msg_len); 157 buffer_clear(m); 158 buffer_append_space(m, msg_len); 159 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 160 fatal("%s: read: %s", __func__, strerror(errno)); 161 } 162 163 void 164 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 165 { 166 u_char rtype; 167 168 debug3("%s entering: type %d", __func__, type); 169 170 mm_request_receive(sock, m); 171 rtype = buffer_get_char(m); 172 if (rtype != type) 173 fatal("%s: read: rtype %d != type %d", __func__, 174 rtype, type); 175 } 176 177 DH * 178 mm_choose_dh(int min, int nbits, int max) 179 { 180 BIGNUM *p, *g; 181 int success = 0; 182 Buffer m; 183 184 buffer_init(&m); 185 buffer_put_int(&m, min); 186 buffer_put_int(&m, nbits); 187 buffer_put_int(&m, max); 188 189 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 190 191 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 192 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 193 194 success = buffer_get_char(&m); 195 if (success == 0) 196 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 197 198 if ((p = BN_new()) == NULL) 199 fatal("%s: BN_new failed", __func__); 200 if ((g = BN_new()) == NULL) 201 fatal("%s: BN_new failed", __func__); 202 buffer_get_bignum2(&m, p); 203 buffer_get_bignum2(&m, g); 204 205 debug3("%s: remaining %d", __func__, buffer_len(&m)); 206 buffer_free(&m); 207 208 return (dh_new_group(g, p)); 209 } 210 211 int 212 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 213 { 214 Kex *kex = *pmonitor->m_pkex; 215 Buffer m; 216 217 debug3("%s entering", __func__); 218 219 buffer_init(&m); 220 buffer_put_int(&m, kex->host_key_index(key)); 221 buffer_put_string(&m, data, datalen); 222 223 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 224 225 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 226 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 227 *sigp = buffer_get_string(&m, lenp); 228 buffer_free(&m); 229 230 return (0); 231 } 232 233 struct passwd * 234 mm_getpwnamallow(const char *username) 235 { 236 Buffer m; 237 struct passwd *pw; 238 u_int len, i; 239 ServerOptions *newopts; 240 241 debug3("%s entering", __func__); 242 243 buffer_init(&m); 244 buffer_put_cstring(&m, username); 245 246 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 247 248 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 249 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 250 251 if (buffer_get_char(&m) == 0) { 252 pw = NULL; 253 goto out; 254 } 255 pw = buffer_get_string(&m, &len); 256 if (len != sizeof(struct passwd)) 257 fatal("%s: struct passwd size mismatch", __func__); 258 pw->pw_name = buffer_get_string(&m, NULL); 259 pw->pw_passwd = buffer_get_string(&m, NULL); 260 pw->pw_gecos = buffer_get_string(&m, NULL); 261 pw->pw_class = buffer_get_string(&m, NULL); 262 pw->pw_dir = buffer_get_string(&m, NULL); 263 pw->pw_shell = buffer_get_string(&m, NULL); 264 265 out: 266 /* copy options block as a Match directive may have changed some */ 267 newopts = buffer_get_string(&m, &len); 268 if (len != sizeof(*newopts)) 269 fatal("%s: option block size mismatch", __func__); 270 271 #define M_CP_STROPT(x) do { \ 272 if (newopts->x != NULL) \ 273 newopts->x = buffer_get_string(&m, NULL); \ 274 } while (0) 275 #define M_CP_STRARRAYOPT(x, nx) do { \ 276 for (i = 0; i < newopts->nx; i++) \ 277 newopts->x[i] = buffer_get_string(&m, NULL); \ 278 } while (0) 279 /* See comment in servconf.h */ 280 COPY_MATCH_STRING_OPTS(); 281 #undef M_CP_STROPT 282 #undef M_CP_STRARRAYOPT 283 284 copy_set_server_options(&options, newopts, 1); 285 xfree(newopts); 286 287 buffer_free(&m); 288 289 return (pw); 290 } 291 292 char * 293 mm_auth2_read_banner(void) 294 { 295 Buffer m; 296 char *banner; 297 298 debug3("%s entering", __func__); 299 300 buffer_init(&m); 301 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 302 buffer_clear(&m); 303 304 mm_request_receive_expect(pmonitor->m_recvfd, 305 MONITOR_ANS_AUTH2_READ_BANNER, &m); 306 banner = buffer_get_string(&m, NULL); 307 buffer_free(&m); 308 309 /* treat empty banner as missing banner */ 310 if (strlen(banner) == 0) { 311 xfree(banner); 312 banner = NULL; 313 } 314 return (banner); 315 } 316 317 /* Inform the privileged process about service and style */ 318 319 void 320 mm_inform_authserv(char *service, char *style) 321 { 322 Buffer m; 323 324 debug3("%s entering", __func__); 325 326 buffer_init(&m); 327 buffer_put_cstring(&m, service); 328 buffer_put_cstring(&m, style ? style : ""); 329 330 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 331 332 buffer_free(&m); 333 } 334 335 /* Do the password authentication */ 336 int 337 mm_auth_password(Authctxt *authctxt, const char *password) 338 { 339 Buffer m; 340 int authenticated = 0; 341 342 debug3("%s entering", __func__); 343 344 buffer_init(&m); 345 buffer_put_cstring(&m, password); 346 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 347 348 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 349 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 350 351 authenticated = buffer_get_int(&m); 352 353 buffer_free(&m); 354 355 debug3("%s: user %sauthenticated", 356 __func__, authenticated ? "" : "not "); 357 return (authenticated); 358 } 359 360 int 361 mm_user_key_allowed(struct passwd *pw, Key *key) 362 { 363 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 364 } 365 366 int 367 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 368 Key *key) 369 { 370 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 371 } 372 373 int 374 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 375 char *host, Key *key) 376 { 377 int ret; 378 379 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 380 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 381 key->type = KEY_RSA1; 382 return (ret); 383 } 384 385 int 386 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 387 { 388 Buffer m; 389 u_char *blob; 390 u_int len; 391 int allowed = 0, have_forced = 0; 392 393 debug3("%s entering", __func__); 394 395 /* Convert the key to a blob and the pass it over */ 396 if (!key_to_blob(key, &blob, &len)) 397 return (0); 398 399 buffer_init(&m); 400 buffer_put_int(&m, type); 401 buffer_put_cstring(&m, user ? user : ""); 402 buffer_put_cstring(&m, host ? host : ""); 403 buffer_put_string(&m, blob, len); 404 xfree(blob); 405 406 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 407 408 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 409 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 410 411 allowed = buffer_get_int(&m); 412 413 /* fake forced command */ 414 auth_clear_options(); 415 have_forced = buffer_get_int(&m); 416 forced_command = have_forced ? xstrdup("true") : NULL; 417 418 buffer_free(&m); 419 420 return (allowed); 421 } 422 423 /* 424 * This key verify needs to send the key type along, because the 425 * privileged parent makes the decision if the key is allowed 426 * for authentication. 427 */ 428 429 int 430 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 431 { 432 Buffer m; 433 u_char *blob; 434 u_int len; 435 int verified = 0; 436 437 debug3("%s entering", __func__); 438 439 /* Convert the key to a blob and the pass it over */ 440 if (!key_to_blob(key, &blob, &len)) 441 return (0); 442 443 buffer_init(&m); 444 buffer_put_string(&m, blob, len); 445 buffer_put_string(&m, sig, siglen); 446 buffer_put_string(&m, data, datalen); 447 xfree(blob); 448 449 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 450 451 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 452 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 453 454 verified = buffer_get_int(&m); 455 456 buffer_free(&m); 457 458 return (verified); 459 } 460 461 /* Export key state after authentication */ 462 Newkeys * 463 mm_newkeys_from_blob(u_char *blob, int blen) 464 { 465 Buffer b; 466 u_int len; 467 Newkeys *newkey = NULL; 468 Enc *enc; 469 Mac *mac; 470 Comp *comp; 471 472 debug3("%s: %p(%d)", __func__, blob, blen); 473 #ifdef DEBUG_PK 474 dump_base64(stderr, blob, blen); 475 #endif 476 buffer_init(&b); 477 buffer_append(&b, blob, blen); 478 479 newkey = xmalloc(sizeof(*newkey)); 480 enc = &newkey->enc; 481 mac = &newkey->mac; 482 comp = &newkey->comp; 483 484 /* Enc structure */ 485 enc->name = buffer_get_string(&b, NULL); 486 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 487 enc->enabled = buffer_get_int(&b); 488 enc->block_size = buffer_get_int(&b); 489 enc->key = buffer_get_string(&b, &enc->key_len); 490 enc->iv = buffer_get_string(&b, &len); 491 if (len != enc->block_size) 492 fatal("%s: bad ivlen: expected %u != %u", __func__, 493 enc->block_size, len); 494 495 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 496 fatal("%s: bad cipher name %s or pointer %p", __func__, 497 enc->name, enc->cipher); 498 499 /* Mac structure */ 500 mac->name = buffer_get_string(&b, NULL); 501 if (mac->name == NULL || mac_setup(mac, mac->name) == -1) 502 fatal("%s: can not setup mac %s", __func__, mac->name); 503 mac->enabled = buffer_get_int(&b); 504 mac->key = buffer_get_string(&b, &len); 505 if (len > mac->key_len) 506 fatal("%s: bad mac key length: %u > %d", __func__, len, 507 mac->key_len); 508 mac->key_len = len; 509 510 /* Comp structure */ 511 comp->type = buffer_get_int(&b); 512 comp->enabled = buffer_get_int(&b); 513 comp->name = buffer_get_string(&b, NULL); 514 515 len = buffer_len(&b); 516 if (len != 0) 517 error("newkeys_from_blob: remaining bytes in blob %u", len); 518 buffer_free(&b); 519 return (newkey); 520 } 521 522 int 523 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 524 { 525 Buffer b; 526 int len; 527 Enc *enc; 528 Mac *mac; 529 Comp *comp; 530 Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode); 531 532 debug3("%s: converting %p", __func__, newkey); 533 534 if (newkey == NULL) { 535 error("%s: newkey == NULL", __func__); 536 return 0; 537 } 538 enc = &newkey->enc; 539 mac = &newkey->mac; 540 comp = &newkey->comp; 541 542 buffer_init(&b); 543 /* Enc structure */ 544 buffer_put_cstring(&b, enc->name); 545 /* The cipher struct is constant and shared, you export pointer */ 546 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 547 buffer_put_int(&b, enc->enabled); 548 buffer_put_int(&b, enc->block_size); 549 buffer_put_string(&b, enc->key, enc->key_len); 550 packet_get_keyiv(mode, enc->iv, enc->block_size); 551 buffer_put_string(&b, enc->iv, enc->block_size); 552 553 /* Mac structure */ 554 buffer_put_cstring(&b, mac->name); 555 buffer_put_int(&b, mac->enabled); 556 buffer_put_string(&b, mac->key, mac->key_len); 557 558 /* Comp structure */ 559 buffer_put_int(&b, comp->type); 560 buffer_put_int(&b, comp->enabled); 561 buffer_put_cstring(&b, comp->name); 562 563 len = buffer_len(&b); 564 if (lenp != NULL) 565 *lenp = len; 566 if (blobp != NULL) { 567 *blobp = xmalloc(len); 568 memcpy(*blobp, buffer_ptr(&b), len); 569 } 570 memset(buffer_ptr(&b), 0, len); 571 buffer_free(&b); 572 return len; 573 } 574 575 static void 576 mm_send_kex(Buffer *m, Kex *kex) 577 { 578 buffer_put_string(m, kex->session_id, kex->session_id_len); 579 buffer_put_int(m, kex->we_need); 580 buffer_put_int(m, kex->hostkey_type); 581 buffer_put_int(m, kex->kex_type); 582 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 583 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 584 buffer_put_int(m, kex->flags); 585 buffer_put_cstring(m, kex->client_version_string); 586 buffer_put_cstring(m, kex->server_version_string); 587 } 588 589 void 590 mm_send_keystate(struct monitor *monitor) 591 { 592 Buffer m, *input, *output; 593 u_char *blob, *p; 594 u_int bloblen, plen; 595 u_int32_t seqnr, packets; 596 u_int64_t blocks, bytes; 597 598 buffer_init(&m); 599 600 if (!compat20) { 601 u_char iv[24]; 602 u_char *key; 603 u_int ivlen, keylen; 604 605 buffer_put_int(&m, packet_get_protocol_flags()); 606 607 buffer_put_int(&m, packet_get_ssh1_cipher()); 608 609 debug3("%s: Sending ssh1 KEY+IV", __func__); 610 keylen = packet_get_encryption_key(NULL); 611 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 612 keylen = packet_get_encryption_key(key); 613 buffer_put_string(&m, key, keylen); 614 memset(key, 0, keylen); 615 xfree(key); 616 617 ivlen = packet_get_keyiv_len(MODE_OUT); 618 packet_get_keyiv(MODE_OUT, iv, ivlen); 619 buffer_put_string(&m, iv, ivlen); 620 ivlen = packet_get_keyiv_len(MODE_OUT); 621 packet_get_keyiv(MODE_IN, iv, ivlen); 622 buffer_put_string(&m, iv, ivlen); 623 goto skip; 624 } else { 625 /* Kex for rekeying */ 626 mm_send_kex(&m, *monitor->m_pkex); 627 } 628 629 debug3("%s: Sending new keys: %p %p", 630 __func__, packet_get_newkeys(MODE_OUT), 631 packet_get_newkeys(MODE_IN)); 632 633 /* Keys from Kex */ 634 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 635 fatal("%s: conversion of newkeys failed", __func__); 636 637 buffer_put_string(&m, blob, bloblen); 638 xfree(blob); 639 640 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 641 fatal("%s: conversion of newkeys failed", __func__); 642 643 buffer_put_string(&m, blob, bloblen); 644 xfree(blob); 645 646 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); 647 buffer_put_int(&m, seqnr); 648 buffer_put_int64(&m, blocks); 649 buffer_put_int(&m, packets); 650 buffer_put_int64(&m, bytes); 651 packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); 652 buffer_put_int(&m, seqnr); 653 buffer_put_int64(&m, blocks); 654 buffer_put_int(&m, packets); 655 buffer_put_int64(&m, bytes); 656 657 debug3("%s: New keys have been sent", __func__); 658 skip: 659 /* More key context */ 660 plen = packet_get_keycontext(MODE_OUT, NULL); 661 p = xmalloc(plen+1); 662 packet_get_keycontext(MODE_OUT, p); 663 buffer_put_string(&m, p, plen); 664 xfree(p); 665 666 plen = packet_get_keycontext(MODE_IN, NULL); 667 p = xmalloc(plen+1); 668 packet_get_keycontext(MODE_IN, p); 669 buffer_put_string(&m, p, plen); 670 xfree(p); 671 672 /* Compression state */ 673 debug3("%s: Sending compression state", __func__); 674 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 675 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 676 677 /* Network I/O buffers */ 678 input = (Buffer *)packet_get_input(); 679 output = (Buffer *)packet_get_output(); 680 buffer_put_string(&m, buffer_ptr(input), buffer_len(input)); 681 buffer_put_string(&m, buffer_ptr(output), buffer_len(output)); 682 683 /* Roaming */ 684 if (compat20) { 685 buffer_put_int64(&m, get_sent_bytes()); 686 buffer_put_int64(&m, get_recv_bytes()); 687 } 688 689 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 690 debug3("%s: Finished sending state", __func__); 691 692 buffer_free(&m); 693 } 694 695 int 696 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 697 { 698 Buffer m; 699 char *p, *msg; 700 int success = 0, tmp1 = -1, tmp2 = -1; 701 702 /* Kludge: ensure there are fds free to receive the pty/tty */ 703 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 704 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 705 error("%s: cannot allocate fds for pty", __func__); 706 if (tmp1 > 0) 707 close(tmp1); 708 if (tmp2 > 0) 709 close(tmp2); 710 return 0; 711 } 712 close(tmp1); 713 close(tmp2); 714 715 buffer_init(&m); 716 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 717 718 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 719 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 720 721 success = buffer_get_int(&m); 722 if (success == 0) { 723 debug3("%s: pty alloc failed", __func__); 724 buffer_free(&m); 725 return (0); 726 } 727 p = buffer_get_string(&m, NULL); 728 msg = buffer_get_string(&m, NULL); 729 buffer_free(&m); 730 731 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 732 xfree(p); 733 734 buffer_append(&loginmsg, msg, strlen(msg)); 735 xfree(msg); 736 737 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 738 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 739 fatal("%s: receive fds failed", __func__); 740 741 /* Success */ 742 return (1); 743 } 744 745 void 746 mm_session_pty_cleanup2(Session *s) 747 { 748 Buffer m; 749 750 if (s->ttyfd == -1) 751 return; 752 buffer_init(&m); 753 buffer_put_cstring(&m, s->tty); 754 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 755 buffer_free(&m); 756 757 /* closed dup'ed master */ 758 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 759 error("close(s->ptymaster/%d): %s", 760 s->ptymaster, strerror(errno)); 761 762 /* unlink pty from session */ 763 s->ttyfd = -1; 764 } 765 766 #ifdef USE_PAM 767 void 768 mm_start_pam(Authctxt *authctxt) 769 { 770 Buffer m; 771 772 debug3("%s entering", __func__); 773 if (!options.use_pam) 774 fatal("UsePAM=no, but ended up in %s anyway", __func__); 775 776 buffer_init(&m); 777 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 778 779 buffer_free(&m); 780 } 781 782 u_int 783 mm_do_pam_account(void) 784 { 785 Buffer m; 786 u_int ret; 787 char *msg; 788 789 debug3("%s entering", __func__); 790 if (!options.use_pam) 791 fatal("UsePAM=no, but ended up in %s anyway", __func__); 792 793 buffer_init(&m); 794 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 795 796 mm_request_receive_expect(pmonitor->m_recvfd, 797 MONITOR_ANS_PAM_ACCOUNT, &m); 798 ret = buffer_get_int(&m); 799 msg = buffer_get_string(&m, NULL); 800 buffer_append(&loginmsg, msg, strlen(msg)); 801 xfree(msg); 802 803 buffer_free(&m); 804 805 debug3("%s returning %d", __func__, ret); 806 807 return (ret); 808 } 809 810 void * 811 mm_sshpam_init_ctx(Authctxt *authctxt) 812 { 813 Buffer m; 814 int success; 815 816 debug3("%s", __func__); 817 buffer_init(&m); 818 buffer_put_cstring(&m, authctxt->user); 819 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 820 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 821 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 822 success = buffer_get_int(&m); 823 if (success == 0) { 824 debug3("%s: pam_init_ctx failed", __func__); 825 buffer_free(&m); 826 return (NULL); 827 } 828 buffer_free(&m); 829 return (authctxt); 830 } 831 832 int 833 mm_sshpam_query(void *ctx, char **name, char **info, 834 u_int *num, char ***prompts, u_int **echo_on) 835 { 836 Buffer m; 837 u_int i; 838 int ret; 839 840 debug3("%s", __func__); 841 buffer_init(&m); 842 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 843 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 844 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 845 ret = buffer_get_int(&m); 846 debug3("%s: pam_query returned %d", __func__, ret); 847 *name = buffer_get_string(&m, NULL); 848 *info = buffer_get_string(&m, NULL); 849 *num = buffer_get_int(&m); 850 if (*num > PAM_MAX_NUM_MSG) 851 fatal("%s: received %u PAM messages, expected <= %u", 852 __func__, *num, PAM_MAX_NUM_MSG); 853 *prompts = xcalloc((*num + 1), sizeof(char *)); 854 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 855 for (i = 0; i < *num; ++i) { 856 (*prompts)[i] = buffer_get_string(&m, NULL); 857 (*echo_on)[i] = buffer_get_int(&m); 858 } 859 buffer_free(&m); 860 return (ret); 861 } 862 863 int 864 mm_sshpam_respond(void *ctx, u_int num, char **resp) 865 { 866 Buffer m; 867 u_int i; 868 int ret; 869 870 debug3("%s", __func__); 871 buffer_init(&m); 872 buffer_put_int(&m, num); 873 for (i = 0; i < num; ++i) 874 buffer_put_cstring(&m, resp[i]); 875 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 876 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 877 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 878 ret = buffer_get_int(&m); 879 debug3("%s: pam_respond returned %d", __func__, ret); 880 buffer_free(&m); 881 return (ret); 882 } 883 884 void 885 mm_sshpam_free_ctx(void *ctxtp) 886 { 887 Buffer m; 888 889 debug3("%s", __func__); 890 buffer_init(&m); 891 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 892 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 893 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 894 buffer_free(&m); 895 } 896 #endif /* USE_PAM */ 897 898 /* Request process termination */ 899 900 void 901 mm_terminate(void) 902 { 903 Buffer m; 904 905 buffer_init(&m); 906 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 907 buffer_free(&m); 908 } 909 910 int 911 mm_ssh1_session_key(BIGNUM *num) 912 { 913 int rsafail; 914 Buffer m; 915 916 buffer_init(&m); 917 buffer_put_bignum2(&m, num); 918 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 919 920 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 921 922 rsafail = buffer_get_int(&m); 923 buffer_get_bignum2(&m, num); 924 925 buffer_free(&m); 926 927 return (rsafail); 928 } 929 930 #if defined(BSD_AUTH) || defined(SKEY) 931 static void 932 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 933 char ***prompts, u_int **echo_on) 934 { 935 *name = xstrdup(""); 936 *infotxt = xstrdup(""); 937 *numprompts = 1; 938 *prompts = xcalloc(*numprompts, sizeof(char *)); 939 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 940 (*echo_on)[0] = 0; 941 } 942 #endif 943 944 #ifdef BSD_AUTH 945 int 946 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 947 u_int *numprompts, char ***prompts, u_int **echo_on) 948 { 949 Buffer m; 950 u_int success; 951 char *challenge; 952 953 debug3("%s: entering", __func__); 954 955 buffer_init(&m); 956 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 957 958 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 959 &m); 960 success = buffer_get_int(&m); 961 if (success == 0) { 962 debug3("%s: no challenge", __func__); 963 buffer_free(&m); 964 return (-1); 965 } 966 967 /* Get the challenge, and format the response */ 968 challenge = buffer_get_string(&m, NULL); 969 buffer_free(&m); 970 971 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 972 (*prompts)[0] = challenge; 973 974 debug3("%s: received challenge: %s", __func__, challenge); 975 976 return (0); 977 } 978 979 int 980 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 981 { 982 Buffer m; 983 int authok; 984 985 debug3("%s: entering", __func__); 986 if (numresponses != 1) 987 return (-1); 988 989 buffer_init(&m); 990 buffer_put_cstring(&m, responses[0]); 991 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 992 993 mm_request_receive_expect(pmonitor->m_recvfd, 994 MONITOR_ANS_BSDAUTHRESPOND, &m); 995 996 authok = buffer_get_int(&m); 997 buffer_free(&m); 998 999 return ((authok == 0) ? -1 : 0); 1000 } 1001 #endif 1002 1003 #ifdef SKEY 1004 int 1005 mm_skey_query(void *ctx, char **name, char **infotxt, 1006 u_int *numprompts, char ***prompts, u_int **echo_on) 1007 { 1008 Buffer m; 1009 u_int success; 1010 char *challenge; 1011 1012 debug3("%s: entering", __func__); 1013 1014 buffer_init(&m); 1015 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 1016 1017 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 1018 &m); 1019 success = buffer_get_int(&m); 1020 if (success == 0) { 1021 debug3("%s: no challenge", __func__); 1022 buffer_free(&m); 1023 return (-1); 1024 } 1025 1026 /* Get the challenge, and format the response */ 1027 challenge = buffer_get_string(&m, NULL); 1028 buffer_free(&m); 1029 1030 debug3("%s: received challenge: %s", __func__, challenge); 1031 1032 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 1033 1034 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); 1035 xfree(challenge); 1036 1037 return (0); 1038 } 1039 1040 int 1041 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 1042 { 1043 Buffer m; 1044 int authok; 1045 1046 debug3("%s: entering", __func__); 1047 if (numresponses != 1) 1048 return (-1); 1049 1050 buffer_init(&m); 1051 buffer_put_cstring(&m, responses[0]); 1052 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 1053 1054 mm_request_receive_expect(pmonitor->m_recvfd, 1055 MONITOR_ANS_SKEYRESPOND, &m); 1056 1057 authok = buffer_get_int(&m); 1058 buffer_free(&m); 1059 1060 return ((authok == 0) ? -1 : 0); 1061 } 1062 #endif /* SKEY */ 1063 1064 void 1065 mm_ssh1_session_id(u_char session_id[16]) 1066 { 1067 Buffer m; 1068 int i; 1069 1070 debug3("%s entering", __func__); 1071 1072 buffer_init(&m); 1073 for (i = 0; i < 16; i++) 1074 buffer_put_char(&m, session_id[i]); 1075 1076 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 1077 buffer_free(&m); 1078 } 1079 1080 int 1081 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 1082 { 1083 Buffer m; 1084 Key *key; 1085 u_char *blob; 1086 u_int blen; 1087 int allowed = 0, have_forced = 0; 1088 1089 debug3("%s entering", __func__); 1090 1091 buffer_init(&m); 1092 buffer_put_bignum2(&m, client_n); 1093 1094 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 1095 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 1096 1097 allowed = buffer_get_int(&m); 1098 1099 /* fake forced command */ 1100 auth_clear_options(); 1101 have_forced = buffer_get_int(&m); 1102 forced_command = have_forced ? xstrdup("true") : NULL; 1103 1104 if (allowed && rkey != NULL) { 1105 blob = buffer_get_string(&m, &blen); 1106 if ((key = key_from_blob(blob, blen)) == NULL) 1107 fatal("%s: key_from_blob failed", __func__); 1108 *rkey = key; 1109 xfree(blob); 1110 } 1111 buffer_free(&m); 1112 1113 return (allowed); 1114 } 1115 1116 BIGNUM * 1117 mm_auth_rsa_generate_challenge(Key *key) 1118 { 1119 Buffer m; 1120 BIGNUM *challenge; 1121 u_char *blob; 1122 u_int blen; 1123 1124 debug3("%s entering", __func__); 1125 1126 if ((challenge = BN_new()) == NULL) 1127 fatal("%s: BN_new failed", __func__); 1128 1129 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1130 if (key_to_blob(key, &blob, &blen) == 0) 1131 fatal("%s: key_to_blob failed", __func__); 1132 key->type = KEY_RSA1; 1133 1134 buffer_init(&m); 1135 buffer_put_string(&m, blob, blen); 1136 xfree(blob); 1137 1138 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 1139 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 1140 1141 buffer_get_bignum2(&m, challenge); 1142 buffer_free(&m); 1143 1144 return (challenge); 1145 } 1146 1147 int 1148 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 1149 { 1150 Buffer m; 1151 u_char *blob; 1152 u_int blen; 1153 int success = 0; 1154 1155 debug3("%s entering", __func__); 1156 1157 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1158 if (key_to_blob(key, &blob, &blen) == 0) 1159 fatal("%s: key_to_blob failed", __func__); 1160 key->type = KEY_RSA1; 1161 1162 buffer_init(&m); 1163 buffer_put_string(&m, blob, blen); 1164 buffer_put_string(&m, response, 16); 1165 xfree(blob); 1166 1167 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 1168 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 1169 1170 success = buffer_get_int(&m); 1171 buffer_free(&m); 1172 1173 return (success); 1174 } 1175 1176 #ifdef GSSAPI 1177 OM_uint32 1178 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 1179 { 1180 Buffer m; 1181 OM_uint32 major; 1182 1183 /* Client doesn't get to see the context */ 1184 *ctx = NULL; 1185 1186 buffer_init(&m); 1187 buffer_put_string(&m, goid->elements, goid->length); 1188 1189 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 1190 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 1191 1192 major = buffer_get_int(&m); 1193 1194 buffer_free(&m); 1195 return (major); 1196 } 1197 1198 OM_uint32 1199 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 1200 gss_buffer_desc *out, OM_uint32 *flags) 1201 { 1202 Buffer m; 1203 OM_uint32 major; 1204 u_int len; 1205 1206 buffer_init(&m); 1207 buffer_put_string(&m, in->value, in->length); 1208 1209 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 1210 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 1211 1212 major = buffer_get_int(&m); 1213 out->value = buffer_get_string(&m, &len); 1214 out->length = len; 1215 if (flags) 1216 *flags = buffer_get_int(&m); 1217 1218 buffer_free(&m); 1219 1220 return (major); 1221 } 1222 1223 OM_uint32 1224 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 1225 { 1226 Buffer m; 1227 OM_uint32 major; 1228 1229 buffer_init(&m); 1230 buffer_put_string(&m, gssbuf->value, gssbuf->length); 1231 buffer_put_string(&m, gssmic->value, gssmic->length); 1232 1233 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 1234 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 1235 &m); 1236 1237 major = buffer_get_int(&m); 1238 buffer_free(&m); 1239 return(major); 1240 } 1241 1242 int 1243 mm_ssh_gssapi_userok(char *user) 1244 { 1245 Buffer m; 1246 int authenticated = 0; 1247 1248 buffer_init(&m); 1249 1250 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1251 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1252 &m); 1253 1254 authenticated = buffer_get_int(&m); 1255 1256 buffer_free(&m); 1257 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1258 return (authenticated); 1259 } 1260 #endif /* GSSAPI */ 1261 1262 #ifdef JPAKE 1263 void 1264 mm_auth2_jpake_get_pwdata(Authctxt *authctxt, BIGNUM **s, 1265 char **hash_scheme, char **salt) 1266 { 1267 Buffer m; 1268 1269 debug3("%s entering", __func__); 1270 1271 buffer_init(&m); 1272 mm_request_send(pmonitor->m_recvfd, 1273 MONITOR_REQ_JPAKE_GET_PWDATA, &m); 1274 1275 debug3("%s: waiting for MONITOR_ANS_JPAKE_GET_PWDATA", __func__); 1276 mm_request_receive_expect(pmonitor->m_recvfd, 1277 MONITOR_ANS_JPAKE_GET_PWDATA, &m); 1278 1279 *hash_scheme = buffer_get_string(&m, NULL); 1280 *salt = buffer_get_string(&m, NULL); 1281 1282 buffer_free(&m); 1283 } 1284 1285 void 1286 mm_jpake_step1(struct modp_group *grp, 1287 u_char **id, u_int *id_len, 1288 BIGNUM **priv1, BIGNUM **priv2, BIGNUM **g_priv1, BIGNUM **g_priv2, 1289 u_char **priv1_proof, u_int *priv1_proof_len, 1290 u_char **priv2_proof, u_int *priv2_proof_len) 1291 { 1292 Buffer m; 1293 1294 debug3("%s entering", __func__); 1295 1296 buffer_init(&m); 1297 mm_request_send(pmonitor->m_recvfd, 1298 MONITOR_REQ_JPAKE_STEP1, &m); 1299 1300 debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP1", __func__); 1301 mm_request_receive_expect(pmonitor->m_recvfd, 1302 MONITOR_ANS_JPAKE_STEP1, &m); 1303 1304 if ((*priv1 = BN_new()) == NULL || 1305 (*priv2 = BN_new()) == NULL || 1306 (*g_priv1 = BN_new()) == NULL || 1307 (*g_priv2 = BN_new()) == NULL) 1308 fatal("%s: BN_new", __func__); 1309 1310 *id = buffer_get_string(&m, id_len); 1311 /* priv1 and priv2 are, well, private */ 1312 buffer_get_bignum2(&m, *g_priv1); 1313 buffer_get_bignum2(&m, *g_priv2); 1314 *priv1_proof = buffer_get_string(&m, priv1_proof_len); 1315 *priv2_proof = buffer_get_string(&m, priv2_proof_len); 1316 1317 buffer_free(&m); 1318 } 1319 1320 void 1321 mm_jpake_step2(struct modp_group *grp, BIGNUM *s, 1322 BIGNUM *mypub1, BIGNUM *theirpub1, BIGNUM *theirpub2, BIGNUM *mypriv2, 1323 const u_char *theirid, u_int theirid_len, 1324 const u_char *myid, u_int myid_len, 1325 const u_char *theirpub1_proof, u_int theirpub1_proof_len, 1326 const u_char *theirpub2_proof, u_int theirpub2_proof_len, 1327 BIGNUM **newpub, 1328 u_char **newpub_exponent_proof, u_int *newpub_exponent_proof_len) 1329 { 1330 Buffer m; 1331 1332 debug3("%s entering", __func__); 1333 1334 buffer_init(&m); 1335 /* monitor already has all bignums except theirpub1, theirpub2 */ 1336 buffer_put_bignum2(&m, theirpub1); 1337 buffer_put_bignum2(&m, theirpub2); 1338 /* monitor already knows our id */ 1339 buffer_put_string(&m, theirid, theirid_len); 1340 buffer_put_string(&m, theirpub1_proof, theirpub1_proof_len); 1341 buffer_put_string(&m, theirpub2_proof, theirpub2_proof_len); 1342 1343 mm_request_send(pmonitor->m_recvfd, 1344 MONITOR_REQ_JPAKE_STEP2, &m); 1345 1346 debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP2", __func__); 1347 mm_request_receive_expect(pmonitor->m_recvfd, 1348 MONITOR_ANS_JPAKE_STEP2, &m); 1349 1350 if ((*newpub = BN_new()) == NULL) 1351 fatal("%s: BN_new", __func__); 1352 1353 buffer_get_bignum2(&m, *newpub); 1354 *newpub_exponent_proof = buffer_get_string(&m, 1355 newpub_exponent_proof_len); 1356 1357 buffer_free(&m); 1358 } 1359 1360 void 1361 mm_jpake_key_confirm(struct modp_group *grp, BIGNUM *s, BIGNUM *step2_val, 1362 BIGNUM *mypriv2, BIGNUM *mypub1, BIGNUM *mypub2, 1363 BIGNUM *theirpub1, BIGNUM *theirpub2, 1364 const u_char *my_id, u_int my_id_len, 1365 const u_char *their_id, u_int their_id_len, 1366 const u_char *sess_id, u_int sess_id_len, 1367 const u_char *theirpriv2_s_proof, u_int theirpriv2_s_proof_len, 1368 BIGNUM **k, 1369 u_char **confirm_hash, u_int *confirm_hash_len) 1370 { 1371 Buffer m; 1372 1373 debug3("%s entering", __func__); 1374 1375 buffer_init(&m); 1376 /* monitor already has all bignums except step2_val */ 1377 buffer_put_bignum2(&m, step2_val); 1378 /* monitor already knows all the ids */ 1379 buffer_put_string(&m, theirpriv2_s_proof, theirpriv2_s_proof_len); 1380 1381 mm_request_send(pmonitor->m_recvfd, 1382 MONITOR_REQ_JPAKE_KEY_CONFIRM, &m); 1383 1384 debug3("%s: waiting for MONITOR_ANS_JPAKE_KEY_CONFIRM", __func__); 1385 mm_request_receive_expect(pmonitor->m_recvfd, 1386 MONITOR_ANS_JPAKE_KEY_CONFIRM, &m); 1387 1388 /* 'k' is sensitive and stays in the monitor */ 1389 *confirm_hash = buffer_get_string(&m, confirm_hash_len); 1390 1391 buffer_free(&m); 1392 } 1393 1394 int 1395 mm_jpake_check_confirm(const BIGNUM *k, 1396 const u_char *peer_id, u_int peer_id_len, 1397 const u_char *sess_id, u_int sess_id_len, 1398 const u_char *peer_confirm_hash, u_int peer_confirm_hash_len) 1399 { 1400 Buffer m; 1401 int success = 0; 1402 1403 debug3("%s entering", __func__); 1404 1405 buffer_init(&m); 1406 /* k is dummy in slave, ignored */ 1407 /* monitor knows all the ids */ 1408 buffer_put_string(&m, peer_confirm_hash, peer_confirm_hash_len); 1409 mm_request_send(pmonitor->m_recvfd, 1410 MONITOR_REQ_JPAKE_CHECK_CONFIRM, &m); 1411 1412 debug3("%s: waiting for MONITOR_ANS_JPAKE_CHECK_CONFIRM", __func__); 1413 mm_request_receive_expect(pmonitor->m_recvfd, 1414 MONITOR_ANS_JPAKE_CHECK_CONFIRM, &m); 1415 1416 success = buffer_get_int(&m); 1417 buffer_free(&m); 1418 1419 debug3("%s: success = %d", __func__, success); 1420 return success; 1421 } 1422 #endif /* JPAKE */ 1423 1424 #ifdef KRB4 1425 int 1426 mm_auth_krb4(Authctxt *authctxt, void *_auth, char **client, void *_reply) 1427 { 1428 KTEXT auth, reply; 1429 Buffer m; 1430 u_int rlen; 1431 int success = 0; 1432 char *p; 1433 1434 debug3("%s entering", __func__); 1435 auth = _auth; 1436 reply = _reply; 1437 1438 buffer_init(&m); 1439 buffer_put_string(&m, auth->dat, auth->length); 1440 1441 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB4, &m); 1442 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB4, &m); 1443 1444 success = buffer_get_int(&m); 1445 if (success) { 1446 *client = buffer_get_string(&m, NULL); 1447 p = buffer_get_string(&m, &rlen); 1448 if (rlen >= MAX_KTXT_LEN) 1449 fatal("%s: reply from monitor too large", __func__); 1450 reply->length = rlen; 1451 memcpy(reply->dat, p, rlen); 1452 memset(p, 0, rlen); 1453 xfree(p); 1454 } 1455 buffer_free(&m); 1456 return (success); 1457 } 1458 #endif 1459 1460 #ifdef KRB5 1461 int 1462 mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp) 1463 { 1464 krb5_data *tkt, *reply; 1465 Buffer m; 1466 int success; 1467 1468 debug3("%s entering", __func__); 1469 tkt = (krb5_data *) argp; 1470 reply = (krb5_data *) resp; 1471 1472 buffer_init(&m); 1473 buffer_put_string(&m, tkt->data, tkt->length); 1474 1475 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m); 1476 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m); 1477 1478 success = buffer_get_int(&m); 1479 if (success) { 1480 u_int len; 1481 1482 *userp = buffer_get_string(&m, NULL); 1483 reply->data = buffer_get_string(&m, &len); 1484 reply->length = len; 1485 } else { 1486 memset(reply, 0, sizeof(*reply)); 1487 *userp = NULL; 1488 } 1489 1490 buffer_free(&m); 1491 return (success); 1492 } 1493 #endif 1494