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 */ 82 extern int compat20; 83 extern z_stream incoming_stream; 84 extern z_stream outgoing_stream; 85 extern struct monitor *pmonitor; 86 extern Buffer loginmsg; 87 extern ServerOptions options; 88 89 void 90 mm_log_handler(LogLevel level, const char *msg, void *ctx) 91 { 92 Buffer log_msg; 93 struct monitor *mon = (struct monitor *)ctx; 94 95 if (mon->m_log_sendfd == -1) 96 fatal("%s: no log channel", __func__); 97 98 buffer_init(&log_msg); 99 /* 100 * Placeholder for packet length. Will be filled in with the actual 101 * packet length once the packet has been constucted. This saves 102 * fragile math. 103 */ 104 buffer_put_int(&log_msg, 0); 105 106 buffer_put_int(&log_msg, level); 107 buffer_put_cstring(&log_msg, msg); 108 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); 109 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), 110 buffer_len(&log_msg)) != buffer_len(&log_msg)) 111 fatal("%s: write: %s", __func__, strerror(errno)); 112 buffer_free(&log_msg); 113 } 114 115 int 116 mm_is_monitor(void) 117 { 118 /* 119 * m_pid is only set in the privileged part, and 120 * points to the unprivileged child. 121 */ 122 return (pmonitor && pmonitor->m_pid > 0); 123 } 124 125 void 126 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 127 { 128 u_int mlen = buffer_len(m); 129 u_char buf[5]; 130 131 debug3("%s entering: type %d", __func__, type); 132 133 put_u32(buf, mlen + 1); 134 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 135 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 136 fatal("%s: write: %s", __func__, strerror(errno)); 137 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 138 fatal("%s: write: %s", __func__, strerror(errno)); 139 } 140 141 void 142 mm_request_receive(int sock, Buffer *m) 143 { 144 u_char buf[4]; 145 u_int msg_len; 146 147 debug3("%s entering", __func__); 148 149 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 150 if (errno == EPIPE) 151 cleanup_exit(255); 152 fatal("%s: read: %s", __func__, strerror(errno)); 153 } 154 msg_len = get_u32(buf); 155 if (msg_len > 256 * 1024) 156 fatal("%s: read: bad msg_len %d", __func__, msg_len); 157 buffer_clear(m); 158 buffer_append_space(m, msg_len); 159 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 160 fatal("%s: read: %s", __func__, strerror(errno)); 161 } 162 163 void 164 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 165 { 166 u_char rtype; 167 168 debug3("%s entering: type %d", __func__, type); 169 170 mm_request_receive(sock, m); 171 rtype = buffer_get_char(m); 172 if (rtype != type) 173 fatal("%s: read: rtype %d != type %d", __func__, 174 rtype, type); 175 } 176 177 DH * 178 mm_choose_dh(int min, int nbits, int max) 179 { 180 BIGNUM *p, *g; 181 int success = 0; 182 Buffer m; 183 184 buffer_init(&m); 185 buffer_put_int(&m, min); 186 buffer_put_int(&m, nbits); 187 buffer_put_int(&m, max); 188 189 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 190 191 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 192 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 193 194 success = buffer_get_char(&m); 195 if (success == 0) 196 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 197 198 if ((p = BN_new()) == NULL) 199 fatal("%s: BN_new failed", __func__); 200 if ((g = BN_new()) == NULL) 201 fatal("%s: BN_new failed", __func__); 202 buffer_get_bignum2(&m, p); 203 buffer_get_bignum2(&m, g); 204 205 debug3("%s: remaining %d", __func__, buffer_len(&m)); 206 buffer_free(&m); 207 208 return (dh_new_group(g, p)); 209 } 210 211 int 212 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 213 { 214 Kex *kex = *pmonitor->m_pkex; 215 Buffer m; 216 217 debug3("%s entering", __func__); 218 219 buffer_init(&m); 220 buffer_put_int(&m, kex->host_key_index(key)); 221 buffer_put_string(&m, data, datalen); 222 223 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 224 225 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 226 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 227 *sigp = buffer_get_string(&m, lenp); 228 buffer_free(&m); 229 230 return (0); 231 } 232 233 struct passwd * 234 mm_getpwnamallow(const char *username) 235 { 236 Buffer m; 237 struct passwd *pw; 238 u_int len, i; 239 ServerOptions *newopts; 240 241 debug3("%s entering", __func__); 242 243 buffer_init(&m); 244 buffer_put_cstring(&m, username); 245 246 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 247 248 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 249 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 250 251 if (buffer_get_char(&m) == 0) { 252 pw = NULL; 253 goto out; 254 } 255 pw = buffer_get_string(&m, &len); 256 if (len != sizeof(struct passwd)) 257 fatal("%s: struct passwd size mismatch", __func__); 258 pw->pw_name = buffer_get_string(&m, NULL); 259 pw->pw_passwd = buffer_get_string(&m, NULL); 260 #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); 268 269 out: 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 } 295 296 char * 297 mm_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 */ 322 323 void 324 mm_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 */ 340 int 341 mm_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 } 363 364 int 365 mm_user_key_allowed(struct passwd *pw, Key *key) 366 { 367 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 368 } 369 370 int 371 mm_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 } 376 377 int 378 mm_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 } 388 389 int 390 mm_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 */ 432 433 int 434 mm_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 */ 466 Newkeys * 467 mm_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 } 524 525 int 526 mm_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 } 579 580 static void 581 mm_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 } 593 594 void 595 mm_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 } 699 700 int 701 mm_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 } 749 750 void 751 mm_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 772 void 773 mm_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 } 786 787 u_int 788 mm_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 } 814 815 void * 816 mm_sshpam_init_ctx(Authctxt *authctxt) 817 { 818 Buffer m; 819 int success; 820 821 debug3("%s", __func__); 822 buffer_init(&m); 823 buffer_put_cstring(&m, authctxt->user); 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 } 836 837 int 838 mm_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 } 867 868 int 869 mm_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 } 888 889 void 890 mm_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 */ 904 905 void 906 mm_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 } 914 915 int 916 mm_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 } 934 935 static void 936 mm_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 } 946 947 int 948 mm_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 } 980 981 int 982 mm_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 1005 int 1006 mm_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 1041 int 1042 mm_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 1065 void 1066 mm_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 1081 int 1082 mm_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 1117 BIGNUM * 1118 mm_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 1148 int 1149 mm_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 1178 void 1179 mm_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 1192 void 1193 mm_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 1208 OM_uint32 1209 mm_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 1229 OM_uint32 1230 mm_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 1254 OM_uint32 1255 mm_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 1273 int 1274 mm_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