monitor_wrap.c revision 294666
1/* $OpenBSD: monitor_wrap.c,v 1.79 2014/02/02 03:44:31 djm Exp $ */ 2/* 3 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 4 * Copyright 2002 Markus Friedl <markus@openbsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include "includes.h" 29__RCSID("$FreeBSD: stable/10/crypto/openssh/monitor_wrap.c 294666 2016-01-24 15:44:57Z des $"); 30 31#include <sys/types.h> 32#include <sys/uio.h> 33 34#include <errno.h> 35#include <pwd.h> 36#include <signal.h> 37#include <stdarg.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 "openbsd-compat/sys-queue.h" 47#include "xmalloc.h" 48#include "ssh.h" 49#include "dh.h" 50#include "buffer.h" 51#include "key.h" 52#include "cipher.h" 53#include "kex.h" 54#include "hostfile.h" 55#include "auth.h" 56#include "auth-options.h" 57#include "packet.h" 58#include "mac.h" 59#include "log.h" 60#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ 61#undef TARGET_OS_MAC 62#include "zlib.h" 63#define TARGET_OS_MAC 1 64#else 65#include "zlib.h" 66#endif 67#include "monitor.h" 68#ifdef GSSAPI 69#include "ssh-gss.h" 70#endif 71#include "monitor_wrap.h" 72#include "atomicio.h" 73#include "monitor_fdpass.h" 74#include "misc.h" 75#include "uuencode.h" 76 77#include "channels.h" 78#include "session.h" 79#include "servconf.h" 80#include "roaming.h" 81 82/* Imports */ 83extern int compat20; 84extern z_stream incoming_stream; 85extern z_stream outgoing_stream; 86extern struct monitor *pmonitor; 87extern Buffer loginmsg; 88extern ServerOptions options; 89 90void 91mm_log_handler(LogLevel level, const char *msg, void *ctx) 92{ 93 Buffer log_msg; 94 struct monitor *mon = (struct monitor *)ctx; 95 96 if (mon->m_log_sendfd == -1) 97 fatal("%s: no log channel", __func__); 98 99 buffer_init(&log_msg); 100 /* 101 * Placeholder for packet length. Will be filled in with the actual 102 * packet length once the packet has been constucted. This saves 103 * fragile math. 104 */ 105 buffer_put_int(&log_msg, 0); 106 107 buffer_put_int(&log_msg, level); 108 buffer_put_cstring(&log_msg, msg); 109 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); 110 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), 111 buffer_len(&log_msg)) != buffer_len(&log_msg)) 112 fatal("%s: write: %s", __func__, strerror(errno)); 113 buffer_free(&log_msg); 114} 115 116int 117mm_is_monitor(void) 118{ 119 /* 120 * m_pid is only set in the privileged part, and 121 * points to the unprivileged child. 122 */ 123 return (pmonitor && pmonitor->m_pid > 0); 124} 125 126void 127mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 128{ 129 u_int mlen = buffer_len(m); 130 u_char buf[5]; 131 132 debug3("%s entering: type %d", __func__, type); 133 134 put_u32(buf, mlen + 1); 135 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 136 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 137 fatal("%s: write: %s", __func__, strerror(errno)); 138 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 139 fatal("%s: write: %s", __func__, strerror(errno)); 140} 141 142void 143mm_request_receive(int sock, Buffer *m) 144{ 145 u_char buf[4]; 146 u_int msg_len; 147 148 debug3("%s entering", __func__); 149 150 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 151 if (errno == EPIPE) 152 cleanup_exit(255); 153 fatal("%s: read: %s", __func__, strerror(errno)); 154 } 155 msg_len = get_u32(buf); 156 if (msg_len > 256 * 1024) 157 fatal("%s: read: bad msg_len %d", __func__, msg_len); 158 buffer_clear(m); 159 buffer_append_space(m, msg_len); 160 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 161 fatal("%s: read: %s", __func__, strerror(errno)); 162} 163 164void 165mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 166{ 167 u_char rtype; 168 169 debug3("%s entering: type %d", __func__, type); 170 171 mm_request_receive(sock, m); 172 rtype = buffer_get_char(m); 173 if (rtype != type) 174 fatal("%s: read: rtype %d != type %d", __func__, 175 rtype, type); 176} 177 178DH * 179mm_choose_dh(int min, int nbits, int max) 180{ 181 BIGNUM *p, *g; 182 int success = 0; 183 Buffer m; 184 185 buffer_init(&m); 186 buffer_put_int(&m, min); 187 buffer_put_int(&m, nbits); 188 buffer_put_int(&m, max); 189 190 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 191 192 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 193 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 194 195 success = buffer_get_char(&m); 196 if (success == 0) 197 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 198 199 if ((p = BN_new()) == NULL) 200 fatal("%s: BN_new failed", __func__); 201 if ((g = BN_new()) == NULL) 202 fatal("%s: BN_new failed", __func__); 203 buffer_get_bignum2(&m, p); 204 buffer_get_bignum2(&m, g); 205 206 debug3("%s: remaining %d", __func__, buffer_len(&m)); 207 buffer_free(&m); 208 209 return (dh_new_group(g, p)); 210} 211 212int 213mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 214{ 215 Kex *kex = *pmonitor->m_pkex; 216 Buffer m; 217 218 debug3("%s entering", __func__); 219 220 buffer_init(&m); 221 buffer_put_int(&m, kex->host_key_index(key)); 222 buffer_put_string(&m, data, datalen); 223 224 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 225 226 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 227 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 228 *sigp = buffer_get_string(&m, lenp); 229 buffer_free(&m); 230 231 return (0); 232} 233 234struct passwd * 235mm_getpwnamallow(const char *username) 236{ 237 Buffer m; 238 struct passwd *pw; 239 u_int len, i; 240 ServerOptions *newopts; 241 242 debug3("%s entering", __func__); 243 244 buffer_init(&m); 245 buffer_put_cstring(&m, username); 246 247 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 248 249 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 250 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 251 252 if (buffer_get_char(&m) == 0) { 253 pw = NULL; 254 goto out; 255 } 256 pw = buffer_get_string(&m, &len); 257 if (len != sizeof(struct passwd)) 258 fatal("%s: struct passwd size mismatch", __func__); 259 pw->pw_name = buffer_get_string(&m, NULL); 260 pw->pw_passwd = buffer_get_string(&m, NULL); 261#ifdef HAVE_STRUCT_PASSWD_PW_GECOS 262 pw->pw_gecos = buffer_get_string(&m, NULL); 263#endif 264#ifdef HAVE_STRUCT_PASSWD_PW_CLASS 265 pw->pw_class = buffer_get_string(&m, NULL); 266#endif 267 pw->pw_dir = buffer_get_string(&m, NULL); 268 pw->pw_shell = buffer_get_string(&m, NULL); 269 270out: 271 /* copy options block as a Match directive may have changed some */ 272 newopts = buffer_get_string(&m, &len); 273 if (len != sizeof(*newopts)) 274 fatal("%s: option block size mismatch", __func__); 275 276#define M_CP_STROPT(x) do { \ 277 if (newopts->x != NULL) \ 278 newopts->x = buffer_get_string(&m, NULL); \ 279 } while (0) 280#define M_CP_STRARRAYOPT(x, nx) do { \ 281 for (i = 0; i < newopts->nx; i++) \ 282 newopts->x[i] = buffer_get_string(&m, NULL); \ 283 } while (0) 284 /* See comment in servconf.h */ 285 COPY_MATCH_STRING_OPTS(); 286#undef M_CP_STROPT 287#undef M_CP_STRARRAYOPT 288 289 copy_set_server_options(&options, newopts, 1); 290 free(newopts); 291 292 buffer_free(&m); 293 294 return (pw); 295} 296 297char * 298mm_auth2_read_banner(void) 299{ 300 Buffer m; 301 char *banner; 302 303 debug3("%s entering", __func__); 304 305 buffer_init(&m); 306 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 307 buffer_clear(&m); 308 309 mm_request_receive_expect(pmonitor->m_recvfd, 310 MONITOR_ANS_AUTH2_READ_BANNER, &m); 311 banner = buffer_get_string(&m, NULL); 312 buffer_free(&m); 313 314 /* treat empty banner as missing banner */ 315 if (strlen(banner) == 0) { 316 free(banner); 317 banner = NULL; 318 } 319 return (banner); 320} 321 322/* Inform the privileged process about service and style */ 323 324void 325mm_inform_authserv(char *service, char *style) 326{ 327 Buffer m; 328 329 debug3("%s entering", __func__); 330 331 buffer_init(&m); 332 buffer_put_cstring(&m, service); 333 buffer_put_cstring(&m, style ? style : ""); 334 335 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 336 337 buffer_free(&m); 338} 339 340/* Do the password authentication */ 341int 342mm_auth_password(Authctxt *authctxt, char *password) 343{ 344 Buffer m; 345 int authenticated = 0; 346 347 debug3("%s entering", __func__); 348 349 buffer_init(&m); 350 buffer_put_cstring(&m, password); 351 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 352 353 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 354 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 355 356 authenticated = buffer_get_int(&m); 357 358 buffer_free(&m); 359 360 debug3("%s: user %sauthenticated", 361 __func__, authenticated ? "" : "not "); 362 return (authenticated); 363} 364 365int 366mm_user_key_allowed(struct passwd *pw, Key *key) 367{ 368 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 369} 370 371int 372mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 373 Key *key) 374{ 375 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 376} 377 378int 379mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 380 char *host, Key *key) 381{ 382 int ret; 383 384 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 385 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 386 key->type = KEY_RSA1; 387 return (ret); 388} 389 390int 391mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 392{ 393 Buffer m; 394 u_char *blob; 395 u_int len; 396 int allowed = 0, have_forced = 0; 397 398 debug3("%s entering", __func__); 399 400 /* Convert the key to a blob and the pass it over */ 401 if (!key_to_blob(key, &blob, &len)) 402 return (0); 403 404 buffer_init(&m); 405 buffer_put_int(&m, type); 406 buffer_put_cstring(&m, user ? user : ""); 407 buffer_put_cstring(&m, host ? host : ""); 408 buffer_put_string(&m, blob, len); 409 free(blob); 410 411 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 412 413 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 414 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 415 416 allowed = buffer_get_int(&m); 417 418 /* fake forced command */ 419 auth_clear_options(); 420 have_forced = buffer_get_int(&m); 421 forced_command = have_forced ? xstrdup("true") : NULL; 422 423 buffer_free(&m); 424 425 return (allowed); 426} 427 428/* 429 * This key verify needs to send the key type along, because the 430 * privileged parent makes the decision if the key is allowed 431 * for authentication. 432 */ 433 434int 435mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 436{ 437 Buffer m; 438 u_char *blob; 439 u_int len; 440 int verified = 0; 441 442 debug3("%s entering", __func__); 443 444 /* Convert the key to a blob and the pass it over */ 445 if (!key_to_blob(key, &blob, &len)) 446 return (0); 447 448 buffer_init(&m); 449 buffer_put_string(&m, blob, len); 450 buffer_put_string(&m, sig, siglen); 451 buffer_put_string(&m, data, datalen); 452 free(blob); 453 454 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 455 456 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 457 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 458 459 verified = buffer_get_int(&m); 460 461 buffer_free(&m); 462 463 return (verified); 464} 465 466/* Export key state after authentication */ 467Newkeys * 468mm_newkeys_from_blob(u_char *blob, int blen) 469{ 470 Buffer b; 471 u_int len; 472 Newkeys *newkey = NULL; 473 Enc *enc; 474 Mac *mac; 475 Comp *comp; 476 477 debug3("%s: %p(%d)", __func__, blob, blen); 478#ifdef DEBUG_PK 479 dump_base64(stderr, blob, blen); 480#endif 481 buffer_init(&b); 482 buffer_append(&b, blob, blen); 483 484 newkey = xcalloc(1, sizeof(*newkey)); 485 enc = &newkey->enc; 486 mac = &newkey->mac; 487 comp = &newkey->comp; 488 489 /* Enc structure */ 490 enc->name = buffer_get_string(&b, NULL); 491 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 492 enc->enabled = buffer_get_int(&b); 493 enc->block_size = buffer_get_int(&b); 494 enc->key = buffer_get_string(&b, &enc->key_len); 495 enc->iv = buffer_get_string(&b, &enc->iv_len); 496 497 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 498 fatal("%s: bad cipher name %s or pointer %p", __func__, 499 enc->name, enc->cipher); 500 501 /* Mac structure */ 502 if (cipher_authlen(enc->cipher) == 0) { 503 mac->name = buffer_get_string(&b, NULL); 504 if (mac->name == NULL || mac_setup(mac, mac->name) == -1) 505 fatal("%s: can not setup mac %s", __func__, mac->name); 506 mac->enabled = buffer_get_int(&b); 507 mac->key = buffer_get_string(&b, &len); 508 if (len > mac->key_len) 509 fatal("%s: bad mac key length: %u > %d", __func__, len, 510 mac->key_len); 511 mac->key_len = len; 512 } 513 514 /* Comp structure */ 515 comp->type = buffer_get_int(&b); 516 comp->enabled = buffer_get_int(&b); 517 comp->name = buffer_get_string(&b, NULL); 518 519 len = buffer_len(&b); 520 if (len != 0) 521 error("newkeys_from_blob: remaining bytes in blob %u", len); 522 buffer_free(&b); 523 return (newkey); 524} 525 526int 527mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 528{ 529 Buffer b; 530 int len; 531 Enc *enc; 532 Mac *mac; 533 Comp *comp; 534 Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode); 535 536 debug3("%s: converting %p", __func__, newkey); 537 538 if (newkey == NULL) { 539 error("%s: newkey == NULL", __func__); 540 return 0; 541 } 542 enc = &newkey->enc; 543 mac = &newkey->mac; 544 comp = &newkey->comp; 545 546 buffer_init(&b); 547 /* Enc structure */ 548 buffer_put_cstring(&b, enc->name); 549 /* The cipher struct is constant and shared, you export pointer */ 550 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 551 buffer_put_int(&b, enc->enabled); 552 buffer_put_int(&b, enc->block_size); 553 buffer_put_string(&b, enc->key, enc->key_len); 554 packet_get_keyiv(mode, enc->iv, enc->iv_len); 555 buffer_put_string(&b, enc->iv, enc->iv_len); 556 557 /* Mac structure */ 558 if (cipher_authlen(enc->cipher) == 0) { 559 buffer_put_cstring(&b, mac->name); 560 buffer_put_int(&b, mac->enabled); 561 buffer_put_string(&b, mac->key, mac->key_len); 562 } 563 564 /* Comp structure */ 565 buffer_put_int(&b, comp->type); 566 buffer_put_int(&b, comp->enabled); 567 buffer_put_cstring(&b, comp->name); 568 569 len = buffer_len(&b); 570 if (lenp != NULL) 571 *lenp = len; 572 if (blobp != NULL) { 573 *blobp = xmalloc(len); 574 memcpy(*blobp, buffer_ptr(&b), len); 575 } 576 explicit_bzero(buffer_ptr(&b), len); 577 buffer_free(&b); 578 return len; 579} 580 581static void 582mm_send_kex(Buffer *m, Kex *kex) 583{ 584 buffer_put_string(m, kex->session_id, kex->session_id_len); 585 buffer_put_int(m, kex->we_need); 586 buffer_put_int(m, kex->hostkey_type); 587 buffer_put_int(m, kex->kex_type); 588 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 589 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 590 buffer_put_int(m, kex->flags); 591 buffer_put_cstring(m, kex->client_version_string); 592 buffer_put_cstring(m, kex->server_version_string); 593} 594 595void 596mm_send_keystate(struct monitor *monitor) 597{ 598 Buffer m, *input, *output; 599 u_char *blob, *p; 600 u_int bloblen, plen; 601 u_int32_t seqnr, packets; 602 u_int64_t blocks, bytes; 603 604 buffer_init(&m); 605 606 if (!compat20) { 607 u_char iv[24]; 608 u_char *key; 609 u_int ivlen, keylen; 610 611 buffer_put_int(&m, packet_get_protocol_flags()); 612 613 buffer_put_int(&m, packet_get_ssh1_cipher()); 614 615 debug3("%s: Sending ssh1 KEY+IV", __func__); 616 keylen = packet_get_encryption_key(NULL); 617 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 618 keylen = packet_get_encryption_key(key); 619 buffer_put_string(&m, key, keylen); 620 explicit_bzero(key, keylen); 621 free(key); 622 623 ivlen = packet_get_keyiv_len(MODE_OUT); 624 packet_get_keyiv(MODE_OUT, iv, ivlen); 625 buffer_put_string(&m, iv, ivlen); 626 ivlen = packet_get_keyiv_len(MODE_IN); 627 packet_get_keyiv(MODE_IN, iv, ivlen); 628 buffer_put_string(&m, iv, ivlen); 629 goto skip; 630 } else { 631 /* Kex for rekeying */ 632 mm_send_kex(&m, *monitor->m_pkex); 633 } 634 635 debug3("%s: Sending new keys: %p %p", 636 __func__, packet_get_newkeys(MODE_OUT), 637 packet_get_newkeys(MODE_IN)); 638 639 /* Keys from Kex */ 640 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 641 fatal("%s: conversion of newkeys failed", __func__); 642 643 buffer_put_string(&m, blob, bloblen); 644 free(blob); 645 646 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 647 fatal("%s: conversion of newkeys failed", __func__); 648 649 buffer_put_string(&m, blob, bloblen); 650 free(blob); 651 652 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); 653 buffer_put_int(&m, seqnr); 654 buffer_put_int64(&m, blocks); 655 buffer_put_int(&m, packets); 656 buffer_put_int64(&m, bytes); 657 packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); 658 buffer_put_int(&m, seqnr); 659 buffer_put_int64(&m, blocks); 660 buffer_put_int(&m, packets); 661 buffer_put_int64(&m, bytes); 662 663 debug3("%s: New keys have been sent", __func__); 664 skip: 665 /* More key context */ 666 plen = packet_get_keycontext(MODE_OUT, NULL); 667 p = xmalloc(plen+1); 668 packet_get_keycontext(MODE_OUT, p); 669 buffer_put_string(&m, p, plen); 670 free(p); 671 672 plen = packet_get_keycontext(MODE_IN, NULL); 673 p = xmalloc(plen+1); 674 packet_get_keycontext(MODE_IN, p); 675 buffer_put_string(&m, p, plen); 676 free(p); 677 678 /* Compression state */ 679 debug3("%s: Sending compression state", __func__); 680 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 681 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 682 683 /* Network I/O buffers */ 684 input = (Buffer *)packet_get_input(); 685 output = (Buffer *)packet_get_output(); 686 buffer_put_string(&m, buffer_ptr(input), buffer_len(input)); 687 buffer_put_string(&m, buffer_ptr(output), buffer_len(output)); 688 689 /* Roaming */ 690 if (compat20) { 691 buffer_put_int64(&m, get_sent_bytes()); 692 buffer_put_int64(&m, get_recv_bytes()); 693 } 694 695 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 696 debug3("%s: Finished sending state", __func__); 697 698 buffer_free(&m); 699} 700 701int 702mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 703{ 704 Buffer m; 705 char *p, *msg; 706 int success = 0, tmp1 = -1, tmp2 = -1; 707 708 /* Kludge: ensure there are fds free to receive the pty/tty */ 709 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 710 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 711 error("%s: cannot allocate fds for pty", __func__); 712 if (tmp1 > 0) 713 close(tmp1); 714 if (tmp2 > 0) 715 close(tmp2); 716 return 0; 717 } 718 close(tmp1); 719 close(tmp2); 720 721 buffer_init(&m); 722 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 723 724 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 725 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 726 727 success = buffer_get_int(&m); 728 if (success == 0) { 729 debug3("%s: pty alloc failed", __func__); 730 buffer_free(&m); 731 return (0); 732 } 733 p = buffer_get_string(&m, NULL); 734 msg = buffer_get_string(&m, NULL); 735 buffer_free(&m); 736 737 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 738 free(p); 739 740 buffer_append(&loginmsg, msg, strlen(msg)); 741 free(msg); 742 743 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 744 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 745 fatal("%s: receive fds failed", __func__); 746 747 /* Success */ 748 return (1); 749} 750 751void 752mm_session_pty_cleanup2(Session *s) 753{ 754 Buffer m; 755 756 if (s->ttyfd == -1) 757 return; 758 buffer_init(&m); 759 buffer_put_cstring(&m, s->tty); 760 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 761 buffer_free(&m); 762 763 /* closed dup'ed master */ 764 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 765 error("close(s->ptymaster/%d): %s", 766 s->ptymaster, strerror(errno)); 767 768 /* unlink pty from session */ 769 s->ttyfd = -1; 770} 771 772#ifdef USE_PAM 773void 774mm_start_pam(Authctxt *authctxt) 775{ 776 Buffer m; 777 778 debug3("%s entering", __func__); 779 if (!options.use_pam) 780 fatal("UsePAM=no, but ended up in %s anyway", __func__); 781 782 buffer_init(&m); 783 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 784 785 buffer_free(&m); 786} 787 788u_int 789mm_do_pam_account(void) 790{ 791 Buffer m; 792 u_int ret; 793 char *msg; 794 795 debug3("%s entering", __func__); 796 if (!options.use_pam) 797 fatal("UsePAM=no, but ended up in %s anyway", __func__); 798 799 buffer_init(&m); 800 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 801 802 mm_request_receive_expect(pmonitor->m_recvfd, 803 MONITOR_ANS_PAM_ACCOUNT, &m); 804 ret = buffer_get_int(&m); 805 msg = buffer_get_string(&m, NULL); 806 buffer_append(&loginmsg, msg, strlen(msg)); 807 free(msg); 808 809 buffer_free(&m); 810 811 debug3("%s returning %d", __func__, ret); 812 813 return (ret); 814} 815 816void * 817mm_sshpam_init_ctx(Authctxt *authctxt) 818{ 819 Buffer m; 820 int success; 821 822 debug3("%s", __func__); 823 buffer_init(&m); 824 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 825 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 826 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 827 success = buffer_get_int(&m); 828 if (success == 0) { 829 debug3("%s: pam_init_ctx failed", __func__); 830 buffer_free(&m); 831 return (NULL); 832 } 833 buffer_free(&m); 834 return (authctxt); 835} 836 837int 838mm_sshpam_query(void *ctx, char **name, char **info, 839 u_int *num, char ***prompts, u_int **echo_on) 840{ 841 Buffer m; 842 u_int i; 843 int ret; 844 845 debug3("%s", __func__); 846 buffer_init(&m); 847 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 848 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 849 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 850 ret = buffer_get_int(&m); 851 debug3("%s: pam_query returned %d", __func__, ret); 852 *name = buffer_get_string(&m, NULL); 853 *info = buffer_get_string(&m, NULL); 854 *num = buffer_get_int(&m); 855 if (*num > PAM_MAX_NUM_MSG) 856 fatal("%s: recieved %u PAM messages, expected <= %u", 857 __func__, *num, PAM_MAX_NUM_MSG); 858 *prompts = xcalloc((*num + 1), sizeof(char *)); 859 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 860 for (i = 0; i < *num; ++i) { 861 (*prompts)[i] = buffer_get_string(&m, NULL); 862 (*echo_on)[i] = buffer_get_int(&m); 863 } 864 buffer_free(&m); 865 return (ret); 866} 867 868int 869mm_sshpam_respond(void *ctx, u_int num, char **resp) 870{ 871 Buffer m; 872 u_int i; 873 int ret; 874 875 debug3("%s", __func__); 876 buffer_init(&m); 877 buffer_put_int(&m, num); 878 for (i = 0; i < num; ++i) 879 buffer_put_cstring(&m, resp[i]); 880 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 881 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 882 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 883 ret = buffer_get_int(&m); 884 debug3("%s: pam_respond returned %d", __func__, ret); 885 buffer_free(&m); 886 return (ret); 887} 888 889void 890mm_sshpam_free_ctx(void *ctxtp) 891{ 892 Buffer m; 893 894 debug3("%s", __func__); 895 buffer_init(&m); 896 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 897 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 898 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 899 buffer_free(&m); 900} 901#endif /* USE_PAM */ 902 903/* Request process termination */ 904 905void 906mm_terminate(void) 907{ 908 Buffer m; 909 910 buffer_init(&m); 911 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 912 buffer_free(&m); 913} 914 915int 916mm_ssh1_session_key(BIGNUM *num) 917{ 918 int rsafail; 919 Buffer m; 920 921 buffer_init(&m); 922 buffer_put_bignum2(&m, num); 923 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 924 925 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 926 927 rsafail = buffer_get_int(&m); 928 buffer_get_bignum2(&m, num); 929 930 buffer_free(&m); 931 932 return (rsafail); 933} 934 935static void 936mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 937 char ***prompts, u_int **echo_on) 938{ 939 *name = xstrdup(""); 940 *infotxt = xstrdup(""); 941 *numprompts = 1; 942 *prompts = xcalloc(*numprompts, sizeof(char *)); 943 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 944 (*echo_on)[0] = 0; 945} 946 947int 948mm_bsdauth_query(void *ctx, char **name, char **infotxt, 949 u_int *numprompts, char ***prompts, u_int **echo_on) 950{ 951 Buffer m; 952 u_int success; 953 char *challenge; 954 955 debug3("%s: entering", __func__); 956 957 buffer_init(&m); 958 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 959 960 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 961 &m); 962 success = buffer_get_int(&m); 963 if (success == 0) { 964 debug3("%s: no challenge", __func__); 965 buffer_free(&m); 966 return (-1); 967 } 968 969 /* Get the challenge, and format the response */ 970 challenge = buffer_get_string(&m, NULL); 971 buffer_free(&m); 972 973 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 974 (*prompts)[0] = challenge; 975 976 debug3("%s: received challenge: %s", __func__, challenge); 977 978 return (0); 979} 980 981int 982mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 983{ 984 Buffer m; 985 int authok; 986 987 debug3("%s: entering", __func__); 988 if (numresponses != 1) 989 return (-1); 990 991 buffer_init(&m); 992 buffer_put_cstring(&m, responses[0]); 993 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 994 995 mm_request_receive_expect(pmonitor->m_recvfd, 996 MONITOR_ANS_BSDAUTHRESPOND, &m); 997 998 authok = buffer_get_int(&m); 999 buffer_free(&m); 1000 1001 return ((authok == 0) ? -1 : 0); 1002} 1003 1004#ifdef SKEY 1005int 1006mm_skey_query(void *ctx, char **name, char **infotxt, 1007 u_int *numprompts, char ***prompts, u_int **echo_on) 1008{ 1009 Buffer m; 1010 u_int success; 1011 char *challenge; 1012 1013 debug3("%s: entering", __func__); 1014 1015 buffer_init(&m); 1016 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 1017 1018 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 1019 &m); 1020 success = buffer_get_int(&m); 1021 if (success == 0) { 1022 debug3("%s: no challenge", __func__); 1023 buffer_free(&m); 1024 return (-1); 1025 } 1026 1027 /* Get the challenge, and format the response */ 1028 challenge = buffer_get_string(&m, NULL); 1029 buffer_free(&m); 1030 1031 debug3("%s: received challenge: %s", __func__, challenge); 1032 1033 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 1034 1035 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); 1036 free(challenge); 1037 1038 return (0); 1039} 1040 1041int 1042mm_skey_respond(void *ctx, u_int numresponses, char **responses) 1043{ 1044 Buffer m; 1045 int authok; 1046 1047 debug3("%s: entering", __func__); 1048 if (numresponses != 1) 1049 return (-1); 1050 1051 buffer_init(&m); 1052 buffer_put_cstring(&m, responses[0]); 1053 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 1054 1055 mm_request_receive_expect(pmonitor->m_recvfd, 1056 MONITOR_ANS_SKEYRESPOND, &m); 1057 1058 authok = buffer_get_int(&m); 1059 buffer_free(&m); 1060 1061 return ((authok == 0) ? -1 : 0); 1062} 1063#endif /* SKEY */ 1064 1065void 1066mm_ssh1_session_id(u_char session_id[16]) 1067{ 1068 Buffer m; 1069 int i; 1070 1071 debug3("%s entering", __func__); 1072 1073 buffer_init(&m); 1074 for (i = 0; i < 16; i++) 1075 buffer_put_char(&m, session_id[i]); 1076 1077 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 1078 buffer_free(&m); 1079} 1080 1081int 1082mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 1083{ 1084 Buffer m; 1085 Key *key; 1086 u_char *blob; 1087 u_int blen; 1088 int allowed = 0, have_forced = 0; 1089 1090 debug3("%s entering", __func__); 1091 1092 buffer_init(&m); 1093 buffer_put_bignum2(&m, client_n); 1094 1095 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 1096 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 1097 1098 allowed = buffer_get_int(&m); 1099 1100 /* fake forced command */ 1101 auth_clear_options(); 1102 have_forced = buffer_get_int(&m); 1103 forced_command = have_forced ? xstrdup("true") : NULL; 1104 1105 if (allowed && rkey != NULL) { 1106 blob = buffer_get_string(&m, &blen); 1107 if ((key = key_from_blob(blob, blen)) == NULL) 1108 fatal("%s: key_from_blob failed", __func__); 1109 *rkey = key; 1110 free(blob); 1111 } 1112 buffer_free(&m); 1113 1114 return (allowed); 1115} 1116 1117BIGNUM * 1118mm_auth_rsa_generate_challenge(Key *key) 1119{ 1120 Buffer m; 1121 BIGNUM *challenge; 1122 u_char *blob; 1123 u_int blen; 1124 1125 debug3("%s entering", __func__); 1126 1127 if ((challenge = BN_new()) == NULL) 1128 fatal("%s: BN_new failed", __func__); 1129 1130 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1131 if (key_to_blob(key, &blob, &blen) == 0) 1132 fatal("%s: key_to_blob failed", __func__); 1133 key->type = KEY_RSA1; 1134 1135 buffer_init(&m); 1136 buffer_put_string(&m, blob, blen); 1137 free(blob); 1138 1139 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 1140 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 1141 1142 buffer_get_bignum2(&m, challenge); 1143 buffer_free(&m); 1144 1145 return (challenge); 1146} 1147 1148int 1149mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 1150{ 1151 Buffer m; 1152 u_char *blob; 1153 u_int blen; 1154 int success = 0; 1155 1156 debug3("%s entering", __func__); 1157 1158 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1159 if (key_to_blob(key, &blob, &blen) == 0) 1160 fatal("%s: key_to_blob failed", __func__); 1161 key->type = KEY_RSA1; 1162 1163 buffer_init(&m); 1164 buffer_put_string(&m, blob, blen); 1165 buffer_put_string(&m, response, 16); 1166 free(blob); 1167 1168 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 1169 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 1170 1171 success = buffer_get_int(&m); 1172 buffer_free(&m); 1173 1174 return (success); 1175} 1176 1177#ifdef SSH_AUDIT_EVENTS 1178void 1179mm_audit_event(ssh_audit_event_t event) 1180{ 1181 Buffer m; 1182 1183 debug3("%s entering", __func__); 1184 1185 buffer_init(&m); 1186 buffer_put_int(&m, event); 1187 1188 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); 1189 buffer_free(&m); 1190} 1191 1192void 1193mm_audit_run_command(const char *command) 1194{ 1195 Buffer m; 1196 1197 debug3("%s entering command %s", __func__, command); 1198 1199 buffer_init(&m); 1200 buffer_put_cstring(&m, command); 1201 1202 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); 1203 buffer_free(&m); 1204} 1205#endif /* SSH_AUDIT_EVENTS */ 1206 1207#ifdef GSSAPI 1208OM_uint32 1209mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 1210{ 1211 Buffer m; 1212 OM_uint32 major; 1213 1214 /* Client doesn't get to see the context */ 1215 *ctx = NULL; 1216 1217 buffer_init(&m); 1218 buffer_put_string(&m, goid->elements, goid->length); 1219 1220 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 1221 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 1222 1223 major = buffer_get_int(&m); 1224 1225 buffer_free(&m); 1226 return (major); 1227} 1228 1229OM_uint32 1230mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 1231 gss_buffer_desc *out, OM_uint32 *flags) 1232{ 1233 Buffer m; 1234 OM_uint32 major; 1235 u_int len; 1236 1237 buffer_init(&m); 1238 buffer_put_string(&m, in->value, in->length); 1239 1240 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 1241 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 1242 1243 major = buffer_get_int(&m); 1244 out->value = buffer_get_string(&m, &len); 1245 out->length = len; 1246 if (flags) 1247 *flags = buffer_get_int(&m); 1248 1249 buffer_free(&m); 1250 1251 return (major); 1252} 1253 1254OM_uint32 1255mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 1256{ 1257 Buffer m; 1258 OM_uint32 major; 1259 1260 buffer_init(&m); 1261 buffer_put_string(&m, gssbuf->value, gssbuf->length); 1262 buffer_put_string(&m, gssmic->value, gssmic->length); 1263 1264 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 1265 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 1266 &m); 1267 1268 major = buffer_get_int(&m); 1269 buffer_free(&m); 1270 return(major); 1271} 1272 1273int 1274mm_ssh_gssapi_userok(char *user) 1275{ 1276 Buffer m; 1277 int authenticated = 0; 1278 1279 buffer_init(&m); 1280 1281 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1282 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1283 &m); 1284 1285 authenticated = buffer_get_int(&m); 1286 1287 buffer_free(&m); 1288 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1289 return (authenticated); 1290} 1291#endif /* GSSAPI */ 1292 1293