1 /* $NetBSD: monitor_wrap.c,v 1.3 2009/12/27 01:40:47 christos Exp $ */ 2 /* $OpenBSD: monitor_wrap.c,v 1.68 2009/06/22 05:39:28 dtucker 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 1.3 2009/12/27 01:40:47 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 75 #include "channels.h" 76 #include "session.h" 77 #include "servconf.h" 78 #include "roaming.h" 79 80 /* Imports */ 81 extern int compat20; 82 extern z_stream incoming_stream; 83 extern z_stream outgoing_stream; 84 extern struct monitor *pmonitor; 85 extern Buffer loginmsg; 86 extern ServerOptions options; 87 88 int 89 mm_is_monitor(void) 90 { 91 /* 92 * m_pid is only set in the privileged part, and 93 * points to the unprivileged child. 94 */ 95 return (pmonitor && pmonitor->m_pid > 0); 96 } 97 98 void 99 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 100 { 101 u_int mlen = buffer_len(m); 102 u_char buf[5]; 103 104 debug3("%s entering: type %d", __func__, type); 105 106 put_u32(buf, mlen + 1); 107 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 108 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 109 fatal("%s: write: %s", __func__, strerror(errno)); 110 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 111 fatal("%s: write: %s", __func__, strerror(errno)); 112 } 113 114 void 115 mm_request_receive(int sock, Buffer *m) 116 { 117 u_char buf[4]; 118 u_int msg_len; 119 120 debug3("%s entering", __func__); 121 122 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 123 if (errno == EPIPE) 124 cleanup_exit(255); 125 fatal("%s: read: %s", __func__, strerror(errno)); 126 } 127 msg_len = get_u32(buf); 128 if (msg_len > 256 * 1024) 129 fatal("%s: read: bad msg_len %d", __func__, msg_len); 130 buffer_clear(m); 131 buffer_append_space(m, msg_len); 132 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 133 fatal("%s: read: %s", __func__, strerror(errno)); 134 } 135 136 void 137 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 138 { 139 u_char rtype; 140 141 debug3("%s entering: type %d", __func__, type); 142 143 mm_request_receive(sock, m); 144 rtype = buffer_get_char(m); 145 if (rtype != type) 146 fatal("%s: read: rtype %d != type %d", __func__, 147 rtype, type); 148 } 149 150 DH * 151 mm_choose_dh(int min, int nbits, int max) 152 { 153 BIGNUM *p, *g; 154 int success = 0; 155 Buffer m; 156 157 buffer_init(&m); 158 buffer_put_int(&m, min); 159 buffer_put_int(&m, nbits); 160 buffer_put_int(&m, max); 161 162 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 163 164 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 165 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 166 167 success = buffer_get_char(&m); 168 if (success == 0) 169 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 170 171 if ((p = BN_new()) == NULL) 172 fatal("%s: BN_new failed", __func__); 173 if ((g = BN_new()) == NULL) 174 fatal("%s: BN_new failed", __func__); 175 buffer_get_bignum2(&m, p); 176 buffer_get_bignum2(&m, g); 177 178 debug3("%s: remaining %d", __func__, buffer_len(&m)); 179 buffer_free(&m); 180 181 return (dh_new_group(g, p)); 182 } 183 184 int 185 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 186 { 187 Kex *kex = *pmonitor->m_pkex; 188 Buffer m; 189 190 debug3("%s entering", __func__); 191 192 buffer_init(&m); 193 buffer_put_int(&m, kex->host_key_index(key)); 194 buffer_put_string(&m, data, datalen); 195 196 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 197 198 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 199 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 200 *sigp = buffer_get_string(&m, lenp); 201 buffer_free(&m); 202 203 return (0); 204 } 205 206 struct passwd * 207 mm_getpwnamallow(const char *username) 208 { 209 Buffer m; 210 struct passwd *pw; 211 u_int len; 212 ServerOptions *newopts; 213 214 debug3("%s entering", __func__); 215 216 buffer_init(&m); 217 buffer_put_cstring(&m, username); 218 219 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 220 221 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 222 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 223 224 if (buffer_get_char(&m) == 0) { 225 pw = NULL; 226 goto out; 227 } 228 pw = buffer_get_string(&m, &len); 229 if (len != sizeof(struct passwd)) 230 fatal("%s: struct passwd size mismatch", __func__); 231 pw->pw_name = buffer_get_string(&m, NULL); 232 pw->pw_passwd = buffer_get_string(&m, NULL); 233 pw->pw_gecos = buffer_get_string(&m, NULL); 234 pw->pw_class = buffer_get_string(&m, NULL); 235 pw->pw_dir = buffer_get_string(&m, NULL); 236 pw->pw_shell = buffer_get_string(&m, NULL); 237 238 out: 239 /* copy options block as a Match directive may have changed some */ 240 newopts = buffer_get_string(&m, &len); 241 if (len != sizeof(*newopts)) 242 fatal("%s: option block size mismatch", __func__); 243 if (newopts->banner != NULL) 244 newopts->banner = buffer_get_string(&m, NULL); 245 copy_set_server_options(&options, newopts, 1); 246 xfree(newopts); 247 248 buffer_free(&m); 249 250 return (pw); 251 } 252 253 char * 254 mm_auth2_read_banner(void) 255 { 256 Buffer m; 257 char *banner; 258 259 debug3("%s entering", __func__); 260 261 buffer_init(&m); 262 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 263 buffer_clear(&m); 264 265 mm_request_receive_expect(pmonitor->m_recvfd, 266 MONITOR_ANS_AUTH2_READ_BANNER, &m); 267 banner = buffer_get_string(&m, NULL); 268 buffer_free(&m); 269 270 /* treat empty banner as missing banner */ 271 if (strlen(banner) == 0) { 272 xfree(banner); 273 banner = NULL; 274 } 275 return (banner); 276 } 277 278 /* Inform the privileged process about service and style */ 279 280 void 281 mm_inform_authserv(char *service, char *style) 282 { 283 Buffer m; 284 285 debug3("%s entering", __func__); 286 287 buffer_init(&m); 288 buffer_put_cstring(&m, service); 289 buffer_put_cstring(&m, style ? style : ""); 290 291 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 292 293 buffer_free(&m); 294 } 295 296 /* Do the password authentication */ 297 int 298 mm_auth_password(Authctxt *authctxt, char *password) 299 { 300 Buffer m; 301 int authenticated = 0; 302 303 debug3("%s entering", __func__); 304 305 buffer_init(&m); 306 buffer_put_cstring(&m, password); 307 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 308 309 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 310 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 311 312 authenticated = buffer_get_int(&m); 313 314 buffer_free(&m); 315 316 debug3("%s: user %sauthenticated", 317 __func__, authenticated ? "" : "not "); 318 return (authenticated); 319 } 320 321 int 322 mm_user_key_allowed(struct passwd *pw, Key *key) 323 { 324 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 325 } 326 327 int 328 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 329 Key *key) 330 { 331 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 332 } 333 334 int 335 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 336 char *host, Key *key) 337 { 338 int ret; 339 340 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 341 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 342 key->type = KEY_RSA1; 343 return (ret); 344 } 345 346 static void 347 mm_send_debug(Buffer *m) 348 { 349 char *msg; 350 351 while (buffer_len(m)) { 352 msg = buffer_get_string(m, NULL); 353 debug3("%s: Sending debug: %s", __func__, msg); 354 packet_send_debug("%s", msg); 355 xfree(msg); 356 } 357 } 358 359 int 360 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 361 { 362 Buffer m; 363 u_char *blob; 364 u_int len; 365 int allowed = 0, have_forced = 0; 366 367 debug3("%s entering", __func__); 368 369 /* Convert the key to a blob and the pass it over */ 370 if (!key_to_blob(key, &blob, &len)) 371 return (0); 372 373 buffer_init(&m); 374 buffer_put_int(&m, type); 375 buffer_put_cstring(&m, user ? user : ""); 376 buffer_put_cstring(&m, host ? host : ""); 377 buffer_put_string(&m, blob, len); 378 xfree(blob); 379 380 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 381 382 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 383 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 384 385 allowed = buffer_get_int(&m); 386 387 /* fake forced command */ 388 auth_clear_options(); 389 have_forced = buffer_get_int(&m); 390 forced_command = have_forced ? xstrdup("true") : NULL; 391 392 /* Send potential debug messages */ 393 mm_send_debug(&m); 394 395 buffer_free(&m); 396 397 return (allowed); 398 } 399 400 /* 401 * This key verify needs to send the key type along, because the 402 * privileged parent makes the decision if the key is allowed 403 * for authentication. 404 */ 405 406 int 407 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 408 { 409 Buffer m; 410 u_char *blob; 411 u_int len; 412 int verified = 0; 413 414 debug3("%s entering", __func__); 415 416 /* Convert the key to a blob and the pass it over */ 417 if (!key_to_blob(key, &blob, &len)) 418 return (0); 419 420 buffer_init(&m); 421 buffer_put_string(&m, blob, len); 422 buffer_put_string(&m, sig, siglen); 423 buffer_put_string(&m, data, datalen); 424 xfree(blob); 425 426 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 427 428 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 429 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 430 431 verified = buffer_get_int(&m); 432 433 buffer_free(&m); 434 435 return (verified); 436 } 437 438 /* Export key state after authentication */ 439 Newkeys * 440 mm_newkeys_from_blob(u_char *blob, int blen) 441 { 442 Buffer b; 443 u_int len; 444 Newkeys *newkey = NULL; 445 Enc *enc; 446 Mac *mac; 447 Comp *comp; 448 449 debug3("%s: %p(%d)", __func__, blob, blen); 450 #ifdef DEBUG_PK 451 dump_base64(stderr, blob, blen); 452 #endif 453 buffer_init(&b); 454 buffer_append(&b, blob, blen); 455 456 newkey = xmalloc(sizeof(*newkey)); 457 enc = &newkey->enc; 458 mac = &newkey->mac; 459 comp = &newkey->comp; 460 461 /* Enc structure */ 462 enc->name = buffer_get_string(&b, NULL); 463 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 464 enc->enabled = buffer_get_int(&b); 465 enc->block_size = buffer_get_int(&b); 466 enc->key = buffer_get_string(&b, &enc->key_len); 467 enc->iv = buffer_get_string(&b, &len); 468 if (len != enc->block_size) 469 fatal("%s: bad ivlen: expected %u != %u", __func__, 470 enc->block_size, len); 471 472 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 473 fatal("%s: bad cipher name %s or pointer %p", __func__, 474 enc->name, enc->cipher); 475 476 /* Mac structure */ 477 mac->name = buffer_get_string(&b, NULL); 478 if (mac->name == NULL || mac_setup(mac, mac->name) == -1) 479 fatal("%s: can not setup mac %s", __func__, mac->name); 480 mac->enabled = buffer_get_int(&b); 481 mac->key = buffer_get_string(&b, &len); 482 if (len > mac->key_len) 483 fatal("%s: bad mac key length: %u > %d", __func__, len, 484 mac->key_len); 485 mac->key_len = len; 486 487 /* Comp structure */ 488 comp->type = buffer_get_int(&b); 489 comp->enabled = buffer_get_int(&b); 490 comp->name = buffer_get_string(&b, NULL); 491 492 len = buffer_len(&b); 493 if (len != 0) 494 error("newkeys_from_blob: remaining bytes in blob %u", len); 495 buffer_free(&b); 496 return (newkey); 497 } 498 499 int 500 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 501 { 502 Buffer b; 503 int len; 504 Enc *enc; 505 Mac *mac; 506 Comp *comp; 507 Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode); 508 509 debug3("%s: converting %p", __func__, newkey); 510 511 if (newkey == NULL) { 512 error("%s: newkey == NULL", __func__); 513 return 0; 514 } 515 enc = &newkey->enc; 516 mac = &newkey->mac; 517 comp = &newkey->comp; 518 519 buffer_init(&b); 520 /* Enc structure */ 521 buffer_put_cstring(&b, enc->name); 522 /* The cipher struct is constant and shared, you export pointer */ 523 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 524 buffer_put_int(&b, enc->enabled); 525 buffer_put_int(&b, enc->block_size); 526 buffer_put_string(&b, enc->key, enc->key_len); 527 packet_get_keyiv(mode, enc->iv, enc->block_size); 528 buffer_put_string(&b, enc->iv, enc->block_size); 529 530 /* Mac structure */ 531 buffer_put_cstring(&b, mac->name); 532 buffer_put_int(&b, mac->enabled); 533 buffer_put_string(&b, mac->key, mac->key_len); 534 535 /* Comp structure */ 536 buffer_put_int(&b, comp->type); 537 buffer_put_int(&b, comp->enabled); 538 buffer_put_cstring(&b, comp->name); 539 540 len = buffer_len(&b); 541 if (lenp != NULL) 542 *lenp = len; 543 if (blobp != NULL) { 544 *blobp = xmalloc(len); 545 memcpy(*blobp, buffer_ptr(&b), len); 546 } 547 memset(buffer_ptr(&b), 0, len); 548 buffer_free(&b); 549 return len; 550 } 551 552 static void 553 mm_send_kex(Buffer *m, Kex *kex) 554 { 555 buffer_put_string(m, kex->session_id, kex->session_id_len); 556 buffer_put_int(m, kex->we_need); 557 buffer_put_int(m, kex->hostkey_type); 558 buffer_put_int(m, kex->kex_type); 559 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 560 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 561 buffer_put_int(m, kex->flags); 562 buffer_put_cstring(m, kex->client_version_string); 563 buffer_put_cstring(m, kex->server_version_string); 564 } 565 566 void 567 mm_send_keystate(struct monitor *monitor) 568 { 569 Buffer m, *input, *output; 570 u_char *blob, *p; 571 u_int bloblen, plen; 572 u_int32_t seqnr, packets; 573 u_int64_t blocks, bytes; 574 575 buffer_init(&m); 576 577 if (!compat20) { 578 u_char iv[24]; 579 u_char *key; 580 u_int ivlen, keylen; 581 582 buffer_put_int(&m, packet_get_protocol_flags()); 583 584 buffer_put_int(&m, packet_get_ssh1_cipher()); 585 586 debug3("%s: Sending ssh1 KEY+IV", __func__); 587 keylen = packet_get_encryption_key(NULL); 588 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 589 keylen = packet_get_encryption_key(key); 590 buffer_put_string(&m, key, keylen); 591 memset(key, 0, keylen); 592 xfree(key); 593 594 ivlen = packet_get_keyiv_len(MODE_OUT); 595 packet_get_keyiv(MODE_OUT, iv, ivlen); 596 buffer_put_string(&m, iv, ivlen); 597 ivlen = packet_get_keyiv_len(MODE_OUT); 598 packet_get_keyiv(MODE_IN, iv, ivlen); 599 buffer_put_string(&m, iv, ivlen); 600 goto skip; 601 } else { 602 /* Kex for rekeying */ 603 mm_send_kex(&m, *monitor->m_pkex); 604 } 605 606 debug3("%s: Sending new keys: %p %p", 607 __func__, packet_get_newkeys(MODE_OUT), 608 packet_get_newkeys(MODE_IN)); 609 610 /* Keys from Kex */ 611 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 612 fatal("%s: conversion of newkeys failed", __func__); 613 614 buffer_put_string(&m, blob, bloblen); 615 xfree(blob); 616 617 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 618 fatal("%s: conversion of newkeys failed", __func__); 619 620 buffer_put_string(&m, blob, bloblen); 621 xfree(blob); 622 623 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); 624 buffer_put_int(&m, seqnr); 625 buffer_put_int64(&m, blocks); 626 buffer_put_int(&m, packets); 627 buffer_put_int64(&m, bytes); 628 packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); 629 buffer_put_int(&m, seqnr); 630 buffer_put_int64(&m, blocks); 631 buffer_put_int(&m, packets); 632 buffer_put_int64(&m, bytes); 633 634 debug3("%s: New keys have been sent", __func__); 635 skip: 636 /* More key context */ 637 plen = packet_get_keycontext(MODE_OUT, NULL); 638 p = xmalloc(plen+1); 639 packet_get_keycontext(MODE_OUT, p); 640 buffer_put_string(&m, p, plen); 641 xfree(p); 642 643 plen = packet_get_keycontext(MODE_IN, NULL); 644 p = xmalloc(plen+1); 645 packet_get_keycontext(MODE_IN, p); 646 buffer_put_string(&m, p, plen); 647 xfree(p); 648 649 /* Compression state */ 650 debug3("%s: Sending compression state", __func__); 651 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 652 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 653 654 /* Network I/O buffers */ 655 input = (Buffer *)packet_get_input(); 656 output = (Buffer *)packet_get_output(); 657 buffer_put_string(&m, buffer_ptr(input), buffer_len(input)); 658 buffer_put_string(&m, buffer_ptr(output), buffer_len(output)); 659 660 /* Roaming */ 661 if (compat20) { 662 buffer_put_int64(&m, get_sent_bytes()); 663 buffer_put_int64(&m, get_recv_bytes()); 664 } 665 666 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 667 debug3("%s: Finished sending state", __func__); 668 669 buffer_free(&m); 670 } 671 672 int 673 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 674 { 675 Buffer m; 676 char *p, *msg; 677 int success = 0, tmp1 = -1, tmp2 = -1; 678 679 /* Kludge: ensure there are fds free to receive the pty/tty */ 680 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 681 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 682 error("%s: cannot allocate fds for pty", __func__); 683 if (tmp1 > 0) 684 close(tmp1); 685 if (tmp2 > 0) 686 close(tmp2); 687 return 0; 688 } 689 close(tmp1); 690 close(tmp2); 691 692 buffer_init(&m); 693 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 694 695 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 696 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 697 698 success = buffer_get_int(&m); 699 if (success == 0) { 700 debug3("%s: pty alloc failed", __func__); 701 buffer_free(&m); 702 return (0); 703 } 704 p = buffer_get_string(&m, NULL); 705 msg = buffer_get_string(&m, NULL); 706 buffer_free(&m); 707 708 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 709 xfree(p); 710 711 buffer_append(&loginmsg, msg, strlen(msg)); 712 xfree(msg); 713 714 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 715 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 716 fatal("%s: receive fds failed", __func__); 717 718 /* Success */ 719 return (1); 720 } 721 722 void 723 mm_session_pty_cleanup2(Session *s) 724 { 725 Buffer m; 726 727 if (s->ttyfd == -1) 728 return; 729 buffer_init(&m); 730 buffer_put_cstring(&m, s->tty); 731 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 732 buffer_free(&m); 733 734 /* closed dup'ed master */ 735 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 736 error("close(s->ptymaster/%d): %s", 737 s->ptymaster, strerror(errno)); 738 739 /* unlink pty from session */ 740 s->ttyfd = -1; 741 } 742 743 #ifdef USE_PAM 744 void 745 mm_start_pam(Authctxt *authctxt) 746 { 747 Buffer m; 748 749 debug3("%s entering", __func__); 750 if (!options.use_pam) 751 fatal("UsePAM=no, but ended up in %s anyway", __func__); 752 753 buffer_init(&m); 754 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 755 756 buffer_free(&m); 757 } 758 759 u_int 760 mm_do_pam_account(void) 761 { 762 Buffer m; 763 u_int ret; 764 char *msg; 765 766 debug3("%s entering", __func__); 767 if (!options.use_pam) 768 fatal("UsePAM=no, but ended up in %s anyway", __func__); 769 770 buffer_init(&m); 771 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 772 773 mm_request_receive_expect(pmonitor->m_recvfd, 774 MONITOR_ANS_PAM_ACCOUNT, &m); 775 ret = buffer_get_int(&m); 776 msg = buffer_get_string(&m, NULL); 777 buffer_append(&loginmsg, msg, strlen(msg)); 778 xfree(msg); 779 780 buffer_free(&m); 781 782 debug3("%s returning %d", __func__, ret); 783 784 return (ret); 785 } 786 787 void * 788 mm_sshpam_init_ctx(Authctxt *authctxt) 789 { 790 Buffer m; 791 int success; 792 793 debug3("%s", __func__); 794 buffer_init(&m); 795 buffer_put_cstring(&m, authctxt->user); 796 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 797 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 798 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 799 success = buffer_get_int(&m); 800 if (success == 0) { 801 debug3("%s: pam_init_ctx failed", __func__); 802 buffer_free(&m); 803 return (NULL); 804 } 805 buffer_free(&m); 806 return (authctxt); 807 } 808 809 int 810 mm_sshpam_query(void *ctx, char **name, char **info, 811 u_int *num, char ***prompts, u_int **echo_on) 812 { 813 Buffer m; 814 u_int i; 815 int ret; 816 817 debug3("%s", __func__); 818 buffer_init(&m); 819 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 820 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 821 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 822 ret = buffer_get_int(&m); 823 debug3("%s: pam_query returned %d", __func__, ret); 824 *name = buffer_get_string(&m, NULL); 825 *info = buffer_get_string(&m, NULL); 826 *num = buffer_get_int(&m); 827 if (*num > PAM_MAX_NUM_MSG) 828 fatal("%s: received %u PAM messages, expected <= %u", 829 __func__, *num, PAM_MAX_NUM_MSG); 830 *prompts = xcalloc((*num + 1), sizeof(char *)); 831 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 832 for (i = 0; i < *num; ++i) { 833 (*prompts)[i] = buffer_get_string(&m, NULL); 834 (*echo_on)[i] = buffer_get_int(&m); 835 } 836 buffer_free(&m); 837 return (ret); 838 } 839 840 int 841 mm_sshpam_respond(void *ctx, u_int num, char **resp) 842 { 843 Buffer m; 844 u_int i; 845 int ret; 846 847 debug3("%s", __func__); 848 buffer_init(&m); 849 buffer_put_int(&m, num); 850 for (i = 0; i < num; ++i) 851 buffer_put_cstring(&m, resp[i]); 852 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 853 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 854 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 855 ret = buffer_get_int(&m); 856 debug3("%s: pam_respond returned %d", __func__, ret); 857 buffer_free(&m); 858 return (ret); 859 } 860 861 void 862 mm_sshpam_free_ctx(void *ctxtp) 863 { 864 Buffer m; 865 866 debug3("%s", __func__); 867 buffer_init(&m); 868 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 869 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 870 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 871 buffer_free(&m); 872 } 873 #endif /* USE_PAM */ 874 875 /* Request process termination */ 876 877 void 878 mm_terminate(void) 879 { 880 Buffer m; 881 882 buffer_init(&m); 883 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 884 buffer_free(&m); 885 } 886 887 int 888 mm_ssh1_session_key(BIGNUM *num) 889 { 890 int rsafail; 891 Buffer m; 892 893 buffer_init(&m); 894 buffer_put_bignum2(&m, num); 895 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 896 897 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 898 899 rsafail = buffer_get_int(&m); 900 buffer_get_bignum2(&m, num); 901 902 buffer_free(&m); 903 904 return (rsafail); 905 } 906 907 #if defined(BSD_AUTH) || defined(SKEY) 908 static void 909 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 910 char ***prompts, u_int **echo_on) 911 { 912 *name = xstrdup(""); 913 *infotxt = xstrdup(""); 914 *numprompts = 1; 915 *prompts = xcalloc(*numprompts, sizeof(char *)); 916 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 917 (*echo_on)[0] = 0; 918 } 919 #endif 920 921 #ifdef BSD_AUTH 922 int 923 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 924 u_int *numprompts, char ***prompts, u_int **echo_on) 925 { 926 Buffer m; 927 u_int success; 928 char *challenge; 929 930 debug3("%s: entering", __func__); 931 932 buffer_init(&m); 933 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 934 935 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 936 &m); 937 success = buffer_get_int(&m); 938 if (success == 0) { 939 debug3("%s: no challenge", __func__); 940 buffer_free(&m); 941 return (-1); 942 } 943 944 /* Get the challenge, and format the response */ 945 challenge = buffer_get_string(&m, NULL); 946 buffer_free(&m); 947 948 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 949 (*prompts)[0] = challenge; 950 951 debug3("%s: received challenge: %s", __func__, challenge); 952 953 return (0); 954 } 955 956 int 957 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 958 { 959 Buffer m; 960 int authok; 961 962 debug3("%s: entering", __func__); 963 if (numresponses != 1) 964 return (-1); 965 966 buffer_init(&m); 967 buffer_put_cstring(&m, responses[0]); 968 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 969 970 mm_request_receive_expect(pmonitor->m_recvfd, 971 MONITOR_ANS_BSDAUTHRESPOND, &m); 972 973 authok = buffer_get_int(&m); 974 buffer_free(&m); 975 976 return ((authok == 0) ? -1 : 0); 977 } 978 #endif 979 980 #ifdef SKEY 981 int 982 mm_skey_query(void *ctx, char **name, char **infotxt, 983 u_int *numprompts, char ***prompts, u_int **echo_on) 984 { 985 Buffer m; 986 u_int success; 987 char *challenge; 988 989 debug3("%s: entering", __func__); 990 991 buffer_init(&m); 992 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 993 994 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 995 &m); 996 success = buffer_get_int(&m); 997 if (success == 0) { 998 debug3("%s: no challenge", __func__); 999 buffer_free(&m); 1000 return (-1); 1001 } 1002 1003 /* Get the challenge, and format the response */ 1004 challenge = buffer_get_string(&m, NULL); 1005 buffer_free(&m); 1006 1007 debug3("%s: received challenge: %s", __func__, challenge); 1008 1009 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 1010 1011 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); 1012 xfree(challenge); 1013 1014 return (0); 1015 } 1016 1017 int 1018 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 1019 { 1020 Buffer m; 1021 int authok; 1022 1023 debug3("%s: entering", __func__); 1024 if (numresponses != 1) 1025 return (-1); 1026 1027 buffer_init(&m); 1028 buffer_put_cstring(&m, responses[0]); 1029 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 1030 1031 mm_request_receive_expect(pmonitor->m_recvfd, 1032 MONITOR_ANS_SKEYRESPOND, &m); 1033 1034 authok = buffer_get_int(&m); 1035 buffer_free(&m); 1036 1037 return ((authok == 0) ? -1 : 0); 1038 } 1039 #endif /* SKEY */ 1040 1041 void 1042 mm_ssh1_session_id(u_char session_id[16]) 1043 { 1044 Buffer m; 1045 int i; 1046 1047 debug3("%s entering", __func__); 1048 1049 buffer_init(&m); 1050 for (i = 0; i < 16; i++) 1051 buffer_put_char(&m, session_id[i]); 1052 1053 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 1054 buffer_free(&m); 1055 } 1056 1057 int 1058 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 1059 { 1060 Buffer m; 1061 Key *key; 1062 u_char *blob; 1063 u_int blen; 1064 int allowed = 0, have_forced = 0; 1065 1066 debug3("%s entering", __func__); 1067 1068 buffer_init(&m); 1069 buffer_put_bignum2(&m, client_n); 1070 1071 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 1072 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 1073 1074 allowed = buffer_get_int(&m); 1075 1076 /* fake forced command */ 1077 auth_clear_options(); 1078 have_forced = buffer_get_int(&m); 1079 forced_command = have_forced ? xstrdup("true") : NULL; 1080 1081 if (allowed && rkey != NULL) { 1082 blob = buffer_get_string(&m, &blen); 1083 if ((key = key_from_blob(blob, blen)) == NULL) 1084 fatal("%s: key_from_blob failed", __func__); 1085 *rkey = key; 1086 xfree(blob); 1087 } 1088 mm_send_debug(&m); 1089 buffer_free(&m); 1090 1091 return (allowed); 1092 } 1093 1094 BIGNUM * 1095 mm_auth_rsa_generate_challenge(Key *key) 1096 { 1097 Buffer m; 1098 BIGNUM *challenge; 1099 u_char *blob; 1100 u_int blen; 1101 1102 debug3("%s entering", __func__); 1103 1104 if ((challenge = BN_new()) == NULL) 1105 fatal("%s: BN_new failed", __func__); 1106 1107 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1108 if (key_to_blob(key, &blob, &blen) == 0) 1109 fatal("%s: key_to_blob failed", __func__); 1110 key->type = KEY_RSA1; 1111 1112 buffer_init(&m); 1113 buffer_put_string(&m, blob, blen); 1114 xfree(blob); 1115 1116 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 1117 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 1118 1119 buffer_get_bignum2(&m, challenge); 1120 buffer_free(&m); 1121 1122 return (challenge); 1123 } 1124 1125 int 1126 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 1127 { 1128 Buffer m; 1129 u_char *blob; 1130 u_int blen; 1131 int success = 0; 1132 1133 debug3("%s entering", __func__); 1134 1135 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1136 if (key_to_blob(key, &blob, &blen) == 0) 1137 fatal("%s: key_to_blob failed", __func__); 1138 key->type = KEY_RSA1; 1139 1140 buffer_init(&m); 1141 buffer_put_string(&m, blob, blen); 1142 buffer_put_string(&m, response, 16); 1143 xfree(blob); 1144 1145 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 1146 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 1147 1148 success = buffer_get_int(&m); 1149 buffer_free(&m); 1150 1151 return (success); 1152 } 1153 1154 #ifdef GSSAPI 1155 OM_uint32 1156 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 1157 { 1158 Buffer m; 1159 OM_uint32 major; 1160 1161 /* Client doesn't get to see the context */ 1162 *ctx = NULL; 1163 1164 buffer_init(&m); 1165 buffer_put_string(&m, goid->elements, goid->length); 1166 1167 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 1168 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 1169 1170 major = buffer_get_int(&m); 1171 1172 buffer_free(&m); 1173 return (major); 1174 } 1175 1176 OM_uint32 1177 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 1178 gss_buffer_desc *out, OM_uint32 *flags) 1179 { 1180 Buffer m; 1181 OM_uint32 major; 1182 u_int len; 1183 1184 buffer_init(&m); 1185 buffer_put_string(&m, in->value, in->length); 1186 1187 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 1188 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 1189 1190 major = buffer_get_int(&m); 1191 out->value = buffer_get_string(&m, &len); 1192 out->length = len; 1193 if (flags) 1194 *flags = buffer_get_int(&m); 1195 1196 buffer_free(&m); 1197 1198 return (major); 1199 } 1200 1201 OM_uint32 1202 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 1203 { 1204 Buffer m; 1205 OM_uint32 major; 1206 1207 buffer_init(&m); 1208 buffer_put_string(&m, gssbuf->value, gssbuf->length); 1209 buffer_put_string(&m, gssmic->value, gssmic->length); 1210 1211 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 1212 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 1213 &m); 1214 1215 major = buffer_get_int(&m); 1216 buffer_free(&m); 1217 return(major); 1218 } 1219 1220 int 1221 mm_ssh_gssapi_userok(char *user) 1222 { 1223 Buffer m; 1224 int authenticated = 0; 1225 1226 buffer_init(&m); 1227 1228 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1229 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1230 &m); 1231 1232 authenticated = buffer_get_int(&m); 1233 1234 buffer_free(&m); 1235 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1236 return (authenticated); 1237 } 1238 #endif /* GSSAPI */ 1239 1240 #ifdef JPAKE 1241 void 1242 mm_auth2_jpake_get_pwdata(Authctxt *authctxt, BIGNUM **s, 1243 char **hash_scheme, char **salt) 1244 { 1245 Buffer m; 1246 1247 debug3("%s entering", __func__); 1248 1249 buffer_init(&m); 1250 mm_request_send(pmonitor->m_recvfd, 1251 MONITOR_REQ_JPAKE_GET_PWDATA, &m); 1252 1253 debug3("%s: waiting for MONITOR_ANS_JPAKE_GET_PWDATA", __func__); 1254 mm_request_receive_expect(pmonitor->m_recvfd, 1255 MONITOR_ANS_JPAKE_GET_PWDATA, &m); 1256 1257 *hash_scheme = buffer_get_string(&m, NULL); 1258 *salt = buffer_get_string(&m, NULL); 1259 1260 buffer_free(&m); 1261 } 1262 1263 void 1264 mm_jpake_step1(struct modp_group *grp, 1265 u_char **id, u_int *id_len, 1266 BIGNUM **priv1, BIGNUM **priv2, BIGNUM **g_priv1, BIGNUM **g_priv2, 1267 u_char **priv1_proof, u_int *priv1_proof_len, 1268 u_char **priv2_proof, u_int *priv2_proof_len) 1269 { 1270 Buffer m; 1271 1272 debug3("%s entering", __func__); 1273 1274 buffer_init(&m); 1275 mm_request_send(pmonitor->m_recvfd, 1276 MONITOR_REQ_JPAKE_STEP1, &m); 1277 1278 debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP1", __func__); 1279 mm_request_receive_expect(pmonitor->m_recvfd, 1280 MONITOR_ANS_JPAKE_STEP1, &m); 1281 1282 if ((*priv1 = BN_new()) == NULL || 1283 (*priv2 = BN_new()) == NULL || 1284 (*g_priv1 = BN_new()) == NULL || 1285 (*g_priv2 = BN_new()) == NULL) 1286 fatal("%s: BN_new", __func__); 1287 1288 *id = buffer_get_string(&m, id_len); 1289 /* priv1 and priv2 are, well, private */ 1290 buffer_get_bignum2(&m, *g_priv1); 1291 buffer_get_bignum2(&m, *g_priv2); 1292 *priv1_proof = buffer_get_string(&m, priv1_proof_len); 1293 *priv2_proof = buffer_get_string(&m, priv2_proof_len); 1294 1295 buffer_free(&m); 1296 } 1297 1298 void 1299 mm_jpake_step2(struct modp_group *grp, BIGNUM *s, 1300 BIGNUM *mypub1, BIGNUM *theirpub1, BIGNUM *theirpub2, BIGNUM *mypriv2, 1301 const u_char *theirid, u_int theirid_len, 1302 const u_char *myid, u_int myid_len, 1303 const u_char *theirpub1_proof, u_int theirpub1_proof_len, 1304 const u_char *theirpub2_proof, u_int theirpub2_proof_len, 1305 BIGNUM **newpub, 1306 u_char **newpub_exponent_proof, u_int *newpub_exponent_proof_len) 1307 { 1308 Buffer m; 1309 1310 debug3("%s entering", __func__); 1311 1312 buffer_init(&m); 1313 /* monitor already has all bignums except theirpub1, theirpub2 */ 1314 buffer_put_bignum2(&m, theirpub1); 1315 buffer_put_bignum2(&m, theirpub2); 1316 /* monitor already knows our id */ 1317 buffer_put_string(&m, theirid, theirid_len); 1318 buffer_put_string(&m, theirpub1_proof, theirpub1_proof_len); 1319 buffer_put_string(&m, theirpub2_proof, theirpub2_proof_len); 1320 1321 mm_request_send(pmonitor->m_recvfd, 1322 MONITOR_REQ_JPAKE_STEP2, &m); 1323 1324 debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP2", __func__); 1325 mm_request_receive_expect(pmonitor->m_recvfd, 1326 MONITOR_ANS_JPAKE_STEP2, &m); 1327 1328 if ((*newpub = BN_new()) == NULL) 1329 fatal("%s: BN_new", __func__); 1330 1331 buffer_get_bignum2(&m, *newpub); 1332 *newpub_exponent_proof = buffer_get_string(&m, 1333 newpub_exponent_proof_len); 1334 1335 buffer_free(&m); 1336 } 1337 1338 void 1339 mm_jpake_key_confirm(struct modp_group *grp, BIGNUM *s, BIGNUM *step2_val, 1340 BIGNUM *mypriv2, BIGNUM *mypub1, BIGNUM *mypub2, 1341 BIGNUM *theirpub1, BIGNUM *theirpub2, 1342 const u_char *my_id, u_int my_id_len, 1343 const u_char *their_id, u_int their_id_len, 1344 const u_char *sess_id, u_int sess_id_len, 1345 const u_char *theirpriv2_s_proof, u_int theirpriv2_s_proof_len, 1346 BIGNUM **k, 1347 u_char **confirm_hash, u_int *confirm_hash_len) 1348 { 1349 Buffer m; 1350 1351 debug3("%s entering", __func__); 1352 1353 buffer_init(&m); 1354 /* monitor already has all bignums except step2_val */ 1355 buffer_put_bignum2(&m, step2_val); 1356 /* monitor already knows all the ids */ 1357 buffer_put_string(&m, theirpriv2_s_proof, theirpriv2_s_proof_len); 1358 1359 mm_request_send(pmonitor->m_recvfd, 1360 MONITOR_REQ_JPAKE_KEY_CONFIRM, &m); 1361 1362 debug3("%s: waiting for MONITOR_ANS_JPAKE_KEY_CONFIRM", __func__); 1363 mm_request_receive_expect(pmonitor->m_recvfd, 1364 MONITOR_ANS_JPAKE_KEY_CONFIRM, &m); 1365 1366 /* 'k' is sensitive and stays in the monitor */ 1367 *confirm_hash = buffer_get_string(&m, confirm_hash_len); 1368 1369 buffer_free(&m); 1370 } 1371 1372 int 1373 mm_jpake_check_confirm(const BIGNUM *k, 1374 const u_char *peer_id, u_int peer_id_len, 1375 const u_char *sess_id, u_int sess_id_len, 1376 const u_char *peer_confirm_hash, u_int peer_confirm_hash_len) 1377 { 1378 Buffer m; 1379 int success = 0; 1380 1381 debug3("%s entering", __func__); 1382 1383 buffer_init(&m); 1384 /* k is dummy in slave, ignored */ 1385 /* monitor knows all the ids */ 1386 buffer_put_string(&m, peer_confirm_hash, peer_confirm_hash_len); 1387 mm_request_send(pmonitor->m_recvfd, 1388 MONITOR_REQ_JPAKE_CHECK_CONFIRM, &m); 1389 1390 debug3("%s: waiting for MONITOR_ANS_JPAKE_CHECK_CONFIRM", __func__); 1391 mm_request_receive_expect(pmonitor->m_recvfd, 1392 MONITOR_ANS_JPAKE_CHECK_CONFIRM, &m); 1393 1394 success = buffer_get_int(&m); 1395 buffer_free(&m); 1396 1397 debug3("%s: success = %d", __func__, success); 1398 return success; 1399 } 1400 #endif /* JPAKE */ 1401 1402 #ifdef KRB4 1403 int 1404 mm_auth_krb4(Authctxt *authctxt, void *_auth, char **client, void *_reply) 1405 { 1406 KTEXT auth, reply; 1407 Buffer m; 1408 u_int rlen; 1409 int success = 0; 1410 char *p; 1411 1412 debug3("%s entering", __func__); 1413 auth = _auth; 1414 reply = _reply; 1415 1416 buffer_init(&m); 1417 buffer_put_string(&m, auth->dat, auth->length); 1418 1419 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB4, &m); 1420 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB4, &m); 1421 1422 success = buffer_get_int(&m); 1423 if (success) { 1424 *client = buffer_get_string(&m, NULL); 1425 p = buffer_get_string(&m, &rlen); 1426 if (rlen >= MAX_KTXT_LEN) 1427 fatal("%s: reply from monitor too large", __func__); 1428 reply->length = rlen; 1429 memcpy(reply->dat, p, rlen); 1430 memset(p, 0, rlen); 1431 xfree(p); 1432 } 1433 buffer_free(&m); 1434 return (success); 1435 } 1436 #endif 1437 1438 #ifdef KRB5 1439 int 1440 mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp) 1441 { 1442 krb5_data *tkt, *reply; 1443 Buffer m; 1444 int success; 1445 1446 debug3("%s entering", __func__); 1447 tkt = (krb5_data *) argp; 1448 reply = (krb5_data *) resp; 1449 1450 buffer_init(&m); 1451 buffer_put_string(&m, tkt->data, tkt->length); 1452 1453 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m); 1454 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m); 1455 1456 success = buffer_get_int(&m); 1457 if (success) { 1458 u_int len; 1459 1460 *userp = buffer_get_string(&m, NULL); 1461 reply->data = buffer_get_string(&m, &len); 1462 reply->length = len; 1463 } else { 1464 memset(reply, 0, sizeof(*reply)); 1465 *userp = NULL; 1466 } 1467 1468 buffer_free(&m); 1469 return (success); 1470 } 1471 #endif 1472