monitor_wrap.c revision 287147
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 30#include <sys/types.h> 31#include <sys/uio.h> 32 33#include <errno.h> 34#include <pwd.h> 35#include <signal.h> 36#include <stdarg.h> 37#include <stdio.h> 38#include <string.h> 39#include <unistd.h> 40 41#include <openssl/bn.h> 42#include <openssl/dh.h> 43#include <openssl/evp.h> 44 45#include "openbsd-compat/sys-queue.h" 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#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ 60#undef TARGET_OS_MAC 61#include "zlib.h" 62#define TARGET_OS_MAC 1 63#else 64#include "zlib.h" 65#endif 66#include "monitor.h" 67#ifdef GSSAPI 68#include "ssh-gss.h" 69#endif 70#include "monitor_wrap.h" 71#include "atomicio.h" 72#include "monitor_fdpass.h" 73#include "misc.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 */ 82extern int compat20; 83extern z_stream incoming_stream; 84extern z_stream outgoing_stream; 85extern struct monitor *pmonitor; 86extern Buffer loginmsg; 87extern ServerOptions options; 88 89void 90mm_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 115int 116mm_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 125void 126mm_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 141void 142mm_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 163void 164mm_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 177DH * 178mm_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 211int 212mm_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 233struct passwd * 234mm_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#ifdef HAVE_STRUCT_PASSWD_PW_GECOS 261 pw->pw_gecos = buffer_get_string(&m, NULL); 262#endif 263#ifdef HAVE_STRUCT_PASSWD_PW_CLASS 264 pw->pw_class = buffer_get_string(&m, NULL); 265#endif 266 pw->pw_dir = buffer_get_string(&m, NULL); 267 pw->pw_shell = buffer_get_string(&m, NULL); 268 269out: 270 /* copy options block as a Match directive may have changed some */ 271 newopts = buffer_get_string(&m, &len); 272 if (len != sizeof(*newopts)) 273 fatal("%s: option block size mismatch", __func__); 274 275#define M_CP_STROPT(x) do { \ 276 if (newopts->x != NULL) \ 277 newopts->x = buffer_get_string(&m, NULL); \ 278 } while (0) 279#define M_CP_STRARRAYOPT(x, nx) do { \ 280 for (i = 0; i < newopts->nx; i++) \ 281 newopts->x[i] = buffer_get_string(&m, NULL); \ 282 } while (0) 283 /* See comment in servconf.h */ 284 COPY_MATCH_STRING_OPTS(); 285#undef M_CP_STROPT 286#undef M_CP_STRARRAYOPT 287 288 copy_set_server_options(&options, newopts, 1); 289 free(newopts); 290 291 buffer_free(&m); 292 293 return (pw); 294} 295 296char * 297mm_auth2_read_banner(void) 298{ 299 Buffer m; 300 char *banner; 301 302 debug3("%s entering", __func__); 303 304 buffer_init(&m); 305 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 306 buffer_clear(&m); 307 308 mm_request_receive_expect(pmonitor->m_recvfd, 309 MONITOR_ANS_AUTH2_READ_BANNER, &m); 310 banner = buffer_get_string(&m, NULL); 311 buffer_free(&m); 312 313 /* treat empty banner as missing banner */ 314 if (strlen(banner) == 0) { 315 free(banner); 316 banner = NULL; 317 } 318 return (banner); 319} 320 321/* Inform the privileged process about service and style */ 322 323void 324mm_inform_authserv(char *service, char *style) 325{ 326 Buffer m; 327 328 debug3("%s entering", __func__); 329 330 buffer_init(&m); 331 buffer_put_cstring(&m, service); 332 buffer_put_cstring(&m, style ? style : ""); 333 334 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 335 336 buffer_free(&m); 337} 338 339/* Do the password authentication */ 340int 341mm_auth_password(Authctxt *authctxt, char *password) 342{ 343 Buffer m; 344 int authenticated = 0; 345 346 debug3("%s entering", __func__); 347 348 buffer_init(&m); 349 buffer_put_cstring(&m, password); 350 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 351 352 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 353 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 354 355 authenticated = buffer_get_int(&m); 356 357 buffer_free(&m); 358 359 debug3("%s: user %sauthenticated", 360 __func__, authenticated ? "" : "not "); 361 return (authenticated); 362} 363 364int 365mm_user_key_allowed(struct passwd *pw, Key *key) 366{ 367 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 368} 369 370int 371mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 372 Key *key) 373{ 374 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 375} 376 377int 378mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 379 char *host, Key *key) 380{ 381 int ret; 382 383 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 384 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 385 key->type = KEY_RSA1; 386 return (ret); 387} 388 389int 390mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 391{ 392 Buffer m; 393 u_char *blob; 394 u_int len; 395 int allowed = 0, have_forced = 0; 396 397 debug3("%s entering", __func__); 398 399 /* Convert the key to a blob and the pass it over */ 400 if (!key_to_blob(key, &blob, &len)) 401 return (0); 402 403 buffer_init(&m); 404 buffer_put_int(&m, type); 405 buffer_put_cstring(&m, user ? user : ""); 406 buffer_put_cstring(&m, host ? host : ""); 407 buffer_put_string(&m, blob, len); 408 free(blob); 409 410 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 411 412 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 413 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 414 415 allowed = buffer_get_int(&m); 416 417 /* fake forced command */ 418 auth_clear_options(); 419 have_forced = buffer_get_int(&m); 420 forced_command = have_forced ? xstrdup("true") : NULL; 421 422 buffer_free(&m); 423 424 return (allowed); 425} 426 427/* 428 * This key verify needs to send the key type along, because the 429 * privileged parent makes the decision if the key is allowed 430 * for authentication. 431 */ 432 433int 434mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 435{ 436 Buffer m; 437 u_char *blob; 438 u_int len; 439 int verified = 0; 440 441 debug3("%s entering", __func__); 442 443 /* Convert the key to a blob and the pass it over */ 444 if (!key_to_blob(key, &blob, &len)) 445 return (0); 446 447 buffer_init(&m); 448 buffer_put_string(&m, blob, len); 449 buffer_put_string(&m, sig, siglen); 450 buffer_put_string(&m, data, datalen); 451 free(blob); 452 453 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 454 455 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 456 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 457 458 verified = buffer_get_int(&m); 459 460 buffer_free(&m); 461 462 return (verified); 463} 464 465/* Export key state after authentication */ 466Newkeys * 467mm_newkeys_from_blob(u_char *blob, int blen) 468{ 469 Buffer b; 470 u_int len; 471 Newkeys *newkey = NULL; 472 Enc *enc; 473 Mac *mac; 474 Comp *comp; 475 476 debug3("%s: %p(%d)", __func__, blob, blen); 477#ifdef DEBUG_PK 478 dump_base64(stderr, blob, blen); 479#endif 480 buffer_init(&b); 481 buffer_append(&b, blob, blen); 482 483 newkey = xcalloc(1, sizeof(*newkey)); 484 enc = &newkey->enc; 485 mac = &newkey->mac; 486 comp = &newkey->comp; 487 488 /* Enc structure */ 489 enc->name = buffer_get_string(&b, NULL); 490 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 491 enc->enabled = buffer_get_int(&b); 492 enc->block_size = buffer_get_int(&b); 493 enc->key = buffer_get_string(&b, &enc->key_len); 494 enc->iv = buffer_get_string(&b, &enc->iv_len); 495 496 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 497 fatal("%s: bad cipher name %s or pointer %p", __func__, 498 enc->name, enc->cipher); 499 500 /* Mac structure */ 501 if (cipher_authlen(enc->cipher) == 0) { 502 mac->name = buffer_get_string(&b, NULL); 503 if (mac->name == NULL || mac_setup(mac, mac->name) == -1) 504 fatal("%s: can not setup mac %s", __func__, mac->name); 505 mac->enabled = buffer_get_int(&b); 506 mac->key = buffer_get_string(&b, &len); 507 if (len > mac->key_len) 508 fatal("%s: bad mac key length: %u > %d", __func__, len, 509 mac->key_len); 510 mac->key_len = len; 511 } 512 513 /* Comp structure */ 514 comp->type = buffer_get_int(&b); 515 comp->enabled = buffer_get_int(&b); 516 comp->name = buffer_get_string(&b, NULL); 517 518 len = buffer_len(&b); 519 if (len != 0) 520 error("newkeys_from_blob: remaining bytes in blob %u", len); 521 buffer_free(&b); 522 return (newkey); 523} 524 525int 526mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 527{ 528 Buffer b; 529 int len; 530 Enc *enc; 531 Mac *mac; 532 Comp *comp; 533 Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode); 534 535 debug3("%s: converting %p", __func__, newkey); 536 537 if (newkey == NULL) { 538 error("%s: newkey == NULL", __func__); 539 return 0; 540 } 541 enc = &newkey->enc; 542 mac = &newkey->mac; 543 comp = &newkey->comp; 544 545 buffer_init(&b); 546 /* Enc structure */ 547 buffer_put_cstring(&b, enc->name); 548 /* The cipher struct is constant and shared, you export pointer */ 549 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 550 buffer_put_int(&b, enc->enabled); 551 buffer_put_int(&b, enc->block_size); 552 buffer_put_string(&b, enc->key, enc->key_len); 553 packet_get_keyiv(mode, enc->iv, enc->iv_len); 554 buffer_put_string(&b, enc->iv, enc->iv_len); 555 556 /* Mac structure */ 557 if (cipher_authlen(enc->cipher) == 0) { 558 buffer_put_cstring(&b, mac->name); 559 buffer_put_int(&b, mac->enabled); 560 buffer_put_string(&b, mac->key, mac->key_len); 561 } 562 563 /* Comp structure */ 564 buffer_put_int(&b, comp->type); 565 buffer_put_int(&b, comp->enabled); 566 buffer_put_cstring(&b, comp->name); 567 568 len = buffer_len(&b); 569 if (lenp != NULL) 570 *lenp = len; 571 if (blobp != NULL) { 572 *blobp = xmalloc(len); 573 memcpy(*blobp, buffer_ptr(&b), len); 574 } 575 explicit_bzero(buffer_ptr(&b), len); 576 buffer_free(&b); 577 return len; 578} 579 580static void 581mm_send_kex(Buffer *m, Kex *kex) 582{ 583 buffer_put_string(m, kex->session_id, kex->session_id_len); 584 buffer_put_int(m, kex->we_need); 585 buffer_put_int(m, kex->hostkey_type); 586 buffer_put_int(m, kex->kex_type); 587 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 588 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 589 buffer_put_int(m, kex->flags); 590 buffer_put_cstring(m, kex->client_version_string); 591 buffer_put_cstring(m, kex->server_version_string); 592} 593 594void 595mm_send_keystate(struct monitor *monitor) 596{ 597 Buffer m, *input, *output; 598 u_char *blob, *p; 599 u_int bloblen, plen; 600 u_int32_t seqnr, packets; 601 u_int64_t blocks, bytes; 602 603 buffer_init(&m); 604 605 if (!compat20) { 606 u_char iv[24]; 607 u_char *key; 608 u_int ivlen, keylen; 609 610 buffer_put_int(&m, packet_get_protocol_flags()); 611 612 buffer_put_int(&m, packet_get_ssh1_cipher()); 613 614 debug3("%s: Sending ssh1 KEY+IV", __func__); 615 keylen = packet_get_encryption_key(NULL); 616 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 617 keylen = packet_get_encryption_key(key); 618 buffer_put_string(&m, key, keylen); 619 explicit_bzero(key, keylen); 620 free(key); 621 622 ivlen = packet_get_keyiv_len(MODE_OUT); 623 packet_get_keyiv(MODE_OUT, iv, ivlen); 624 buffer_put_string(&m, iv, ivlen); 625 ivlen = packet_get_keyiv_len(MODE_IN); 626 packet_get_keyiv(MODE_IN, iv, ivlen); 627 buffer_put_string(&m, iv, ivlen); 628 goto skip; 629 } else { 630 /* Kex for rekeying */ 631 mm_send_kex(&m, *monitor->m_pkex); 632 } 633 634 debug3("%s: Sending new keys: %p %p", 635 __func__, packet_get_newkeys(MODE_OUT), 636 packet_get_newkeys(MODE_IN)); 637 638 /* Keys from Kex */ 639 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 640 fatal("%s: conversion of newkeys failed", __func__); 641 642 buffer_put_string(&m, blob, bloblen); 643 free(blob); 644 645 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 646 fatal("%s: conversion of newkeys failed", __func__); 647 648 buffer_put_string(&m, blob, bloblen); 649 free(blob); 650 651 packet_get_state(MODE_OUT, &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 packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); 657 buffer_put_int(&m, seqnr); 658 buffer_put_int64(&m, blocks); 659 buffer_put_int(&m, packets); 660 buffer_put_int64(&m, bytes); 661 662 debug3("%s: New keys have been sent", __func__); 663 skip: 664 /* More key context */ 665 plen = packet_get_keycontext(MODE_OUT, NULL); 666 p = xmalloc(plen+1); 667 packet_get_keycontext(MODE_OUT, p); 668 buffer_put_string(&m, p, plen); 669 free(p); 670 671 plen = packet_get_keycontext(MODE_IN, NULL); 672 p = xmalloc(plen+1); 673 packet_get_keycontext(MODE_IN, p); 674 buffer_put_string(&m, p, plen); 675 free(p); 676 677 /* Compression state */ 678 debug3("%s: Sending compression state", __func__); 679 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 680 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 681 682 /* Network I/O buffers */ 683 input = (Buffer *)packet_get_input(); 684 output = (Buffer *)packet_get_output(); 685 buffer_put_string(&m, buffer_ptr(input), buffer_len(input)); 686 buffer_put_string(&m, buffer_ptr(output), buffer_len(output)); 687 688 /* Roaming */ 689 if (compat20) { 690 buffer_put_int64(&m, get_sent_bytes()); 691 buffer_put_int64(&m, get_recv_bytes()); 692 } 693 694 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 695 debug3("%s: Finished sending state", __func__); 696 697 buffer_free(&m); 698} 699 700int 701mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 702{ 703 Buffer m; 704 char *p, *msg; 705 int success = 0, tmp1 = -1, tmp2 = -1; 706 707 /* Kludge: ensure there are fds free to receive the pty/tty */ 708 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 709 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 710 error("%s: cannot allocate fds for pty", __func__); 711 if (tmp1 > 0) 712 close(tmp1); 713 if (tmp2 > 0) 714 close(tmp2); 715 return 0; 716 } 717 close(tmp1); 718 close(tmp2); 719 720 buffer_init(&m); 721 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 722 723 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 724 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 725 726 success = buffer_get_int(&m); 727 if (success == 0) { 728 debug3("%s: pty alloc failed", __func__); 729 buffer_free(&m); 730 return (0); 731 } 732 p = buffer_get_string(&m, NULL); 733 msg = buffer_get_string(&m, NULL); 734 buffer_free(&m); 735 736 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 737 free(p); 738 739 buffer_append(&loginmsg, msg, strlen(msg)); 740 free(msg); 741 742 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 743 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 744 fatal("%s: receive fds failed", __func__); 745 746 /* Success */ 747 return (1); 748} 749 750void 751mm_session_pty_cleanup2(Session *s) 752{ 753 Buffer m; 754 755 if (s->ttyfd == -1) 756 return; 757 buffer_init(&m); 758 buffer_put_cstring(&m, s->tty); 759 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 760 buffer_free(&m); 761 762 /* closed dup'ed master */ 763 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 764 error("close(s->ptymaster/%d): %s", 765 s->ptymaster, strerror(errno)); 766 767 /* unlink pty from session */ 768 s->ttyfd = -1; 769} 770 771#ifdef USE_PAM 772void 773mm_start_pam(Authctxt *authctxt) 774{ 775 Buffer m; 776 777 debug3("%s entering", __func__); 778 if (!options.use_pam) 779 fatal("UsePAM=no, but ended up in %s anyway", __func__); 780 781 buffer_init(&m); 782 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 783 784 buffer_free(&m); 785} 786 787u_int 788mm_do_pam_account(void) 789{ 790 Buffer m; 791 u_int ret; 792 char *msg; 793 794 debug3("%s entering", __func__); 795 if (!options.use_pam) 796 fatal("UsePAM=no, but ended up in %s anyway", __func__); 797 798 buffer_init(&m); 799 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 800 801 mm_request_receive_expect(pmonitor->m_recvfd, 802 MONITOR_ANS_PAM_ACCOUNT, &m); 803 ret = buffer_get_int(&m); 804 msg = buffer_get_string(&m, NULL); 805 buffer_append(&loginmsg, msg, strlen(msg)); 806 free(msg); 807 808 buffer_free(&m); 809 810 debug3("%s returning %d", __func__, ret); 811 812 return (ret); 813} 814 815void * 816mm_sshpam_init_ctx(Authctxt *authctxt) 817{ 818 Buffer m; 819 int success; 820 821 debug3("%s", __func__); 822 buffer_init(&m); 823 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 824 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 825 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 826 success = buffer_get_int(&m); 827 if (success == 0) { 828 debug3("%s: pam_init_ctx failed", __func__); 829 buffer_free(&m); 830 return (NULL); 831 } 832 buffer_free(&m); 833 return (authctxt); 834} 835 836int 837mm_sshpam_query(void *ctx, char **name, char **info, 838 u_int *num, char ***prompts, u_int **echo_on) 839{ 840 Buffer m; 841 u_int i; 842 int ret; 843 844 debug3("%s", __func__); 845 buffer_init(&m); 846 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 847 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 848 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 849 ret = buffer_get_int(&m); 850 debug3("%s: pam_query returned %d", __func__, ret); 851 *name = buffer_get_string(&m, NULL); 852 *info = buffer_get_string(&m, NULL); 853 *num = buffer_get_int(&m); 854 if (*num > PAM_MAX_NUM_MSG) 855 fatal("%s: recieved %u PAM messages, expected <= %u", 856 __func__, *num, PAM_MAX_NUM_MSG); 857 *prompts = xcalloc((*num + 1), sizeof(char *)); 858 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 859 for (i = 0; i < *num; ++i) { 860 (*prompts)[i] = buffer_get_string(&m, NULL); 861 (*echo_on)[i] = buffer_get_int(&m); 862 } 863 buffer_free(&m); 864 return (ret); 865} 866 867int 868mm_sshpam_respond(void *ctx, u_int num, char **resp) 869{ 870 Buffer m; 871 u_int i; 872 int ret; 873 874 debug3("%s", __func__); 875 buffer_init(&m); 876 buffer_put_int(&m, num); 877 for (i = 0; i < num; ++i) 878 buffer_put_cstring(&m, resp[i]); 879 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 880 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 881 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 882 ret = buffer_get_int(&m); 883 debug3("%s: pam_respond returned %d", __func__, ret); 884 buffer_free(&m); 885 return (ret); 886} 887 888void 889mm_sshpam_free_ctx(void *ctxtp) 890{ 891 Buffer m; 892 893 debug3("%s", __func__); 894 buffer_init(&m); 895 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 896 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 897 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 898 buffer_free(&m); 899} 900#endif /* USE_PAM */ 901 902/* Request process termination */ 903 904void 905mm_terminate(void) 906{ 907 Buffer m; 908 909 buffer_init(&m); 910 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 911 buffer_free(&m); 912} 913 914int 915mm_ssh1_session_key(BIGNUM *num) 916{ 917 int rsafail; 918 Buffer m; 919 920 buffer_init(&m); 921 buffer_put_bignum2(&m, num); 922 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 923 924 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 925 926 rsafail = buffer_get_int(&m); 927 buffer_get_bignum2(&m, num); 928 929 buffer_free(&m); 930 931 return (rsafail); 932} 933 934static void 935mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 936 char ***prompts, u_int **echo_on) 937{ 938 *name = xstrdup(""); 939 *infotxt = xstrdup(""); 940 *numprompts = 1; 941 *prompts = xcalloc(*numprompts, sizeof(char *)); 942 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 943 (*echo_on)[0] = 0; 944} 945 946int 947mm_bsdauth_query(void *ctx, char **name, char **infotxt, 948 u_int *numprompts, char ***prompts, u_int **echo_on) 949{ 950 Buffer m; 951 u_int success; 952 char *challenge; 953 954 debug3("%s: entering", __func__); 955 956 buffer_init(&m); 957 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 958 959 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 960 &m); 961 success = buffer_get_int(&m); 962 if (success == 0) { 963 debug3("%s: no challenge", __func__); 964 buffer_free(&m); 965 return (-1); 966 } 967 968 /* Get the challenge, and format the response */ 969 challenge = buffer_get_string(&m, NULL); 970 buffer_free(&m); 971 972 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 973 (*prompts)[0] = challenge; 974 975 debug3("%s: received challenge: %s", __func__, challenge); 976 977 return (0); 978} 979 980int 981mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 982{ 983 Buffer m; 984 int authok; 985 986 debug3("%s: entering", __func__); 987 if (numresponses != 1) 988 return (-1); 989 990 buffer_init(&m); 991 buffer_put_cstring(&m, responses[0]); 992 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 993 994 mm_request_receive_expect(pmonitor->m_recvfd, 995 MONITOR_ANS_BSDAUTHRESPOND, &m); 996 997 authok = buffer_get_int(&m); 998 buffer_free(&m); 999 1000 return ((authok == 0) ? -1 : 0); 1001} 1002 1003#ifdef SKEY 1004int 1005mm_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 free(challenge); 1036 1037 return (0); 1038} 1039 1040int 1041mm_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 1064void 1065mm_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 1080int 1081mm_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 free(blob); 1110 } 1111 buffer_free(&m); 1112 1113 return (allowed); 1114} 1115 1116BIGNUM * 1117mm_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 free(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 1147int 1148mm_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 free(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 SSH_AUDIT_EVENTS 1177void 1178mm_audit_event(ssh_audit_event_t event) 1179{ 1180 Buffer m; 1181 1182 debug3("%s entering", __func__); 1183 1184 buffer_init(&m); 1185 buffer_put_int(&m, event); 1186 1187 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); 1188 buffer_free(&m); 1189} 1190 1191void 1192mm_audit_run_command(const char *command) 1193{ 1194 Buffer m; 1195 1196 debug3("%s entering command %s", __func__, command); 1197 1198 buffer_init(&m); 1199 buffer_put_cstring(&m, command); 1200 1201 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); 1202 buffer_free(&m); 1203} 1204#endif /* SSH_AUDIT_EVENTS */ 1205 1206#ifdef GSSAPI 1207OM_uint32 1208mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 1209{ 1210 Buffer m; 1211 OM_uint32 major; 1212 1213 /* Client doesn't get to see the context */ 1214 *ctx = NULL; 1215 1216 buffer_init(&m); 1217 buffer_put_string(&m, goid->elements, goid->length); 1218 1219 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 1220 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 1221 1222 major = buffer_get_int(&m); 1223 1224 buffer_free(&m); 1225 return (major); 1226} 1227 1228OM_uint32 1229mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 1230 gss_buffer_desc *out, OM_uint32 *flags) 1231{ 1232 Buffer m; 1233 OM_uint32 major; 1234 u_int len; 1235 1236 buffer_init(&m); 1237 buffer_put_string(&m, in->value, in->length); 1238 1239 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 1240 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 1241 1242 major = buffer_get_int(&m); 1243 out->value = buffer_get_string(&m, &len); 1244 out->length = len; 1245 if (flags) 1246 *flags = buffer_get_int(&m); 1247 1248 buffer_free(&m); 1249 1250 return (major); 1251} 1252 1253OM_uint32 1254mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 1255{ 1256 Buffer m; 1257 OM_uint32 major; 1258 1259 buffer_init(&m); 1260 buffer_put_string(&m, gssbuf->value, gssbuf->length); 1261 buffer_put_string(&m, gssmic->value, gssmic->length); 1262 1263 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 1264 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 1265 &m); 1266 1267 major = buffer_get_int(&m); 1268 buffer_free(&m); 1269 return(major); 1270} 1271 1272int 1273mm_ssh_gssapi_userok(char *user) 1274{ 1275 Buffer m; 1276 int authenticated = 0; 1277 1278 buffer_init(&m); 1279 1280 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1281 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1282 &m); 1283 1284 authenticated = buffer_get_int(&m); 1285 1286 buffer_free(&m); 1287 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1288 return (authenticated); 1289} 1290#endif /* GSSAPI */ 1291 1292