1 /* $OpenBSD: monitor_wrap.c,v 1.80 2014/04/29 18:01:49 markus 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 #ifdef WITH_OPENSSL 42 #include <openssl/bn.h> 43 #include <openssl/dh.h> 44 #include <openssl/evp.h> 45 #endif 46 47 #include "openbsd-compat/sys-queue.h" 48 #include "xmalloc.h" 49 #include "ssh.h" 50 #ifdef WITH_OPENSSL 51 #include "dh.h" 52 #endif 53 #include "buffer.h" 54 #include "key.h" 55 #include "cipher.h" 56 #include "kex.h" 57 #include "hostfile.h" 58 #include "auth.h" 59 #include "auth-options.h" 60 #include "packet.h" 61 #include "mac.h" 62 #include "log.h" 63 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ 64 #undef TARGET_OS_MAC 65 #include "zlib.h" 66 #define TARGET_OS_MAC 1 67 #else 68 #include "zlib.h" 69 #endif 70 #include "monitor.h" 71 #ifdef GSSAPI 72 #include "ssh-gss.h" 73 #endif 74 #include "monitor_wrap.h" 75 #include "atomicio.h" 76 #include "monitor_fdpass.h" 77 #include "misc.h" 78 #include "uuencode.h" 79 80 #include "channels.h" 81 #include "session.h" 82 #include "servconf.h" 83 #include "roaming.h" 84 85 /* Imports */ 86 extern int compat20; 87 extern z_stream incoming_stream; 88 extern z_stream outgoing_stream; 89 extern struct monitor *pmonitor; 90 extern Buffer loginmsg; 91 extern ServerOptions options; 92 93 void 94 mm_log_handler(LogLevel level, const char *msg, void *ctx) 95 { 96 Buffer log_msg; 97 struct monitor *mon = (struct monitor *)ctx; 98 99 if (mon->m_log_sendfd == -1) 100 fatal("%s: no log channel", __func__); 101 102 buffer_init(&log_msg); 103 /* 104 * Placeholder for packet length. Will be filled in with the actual 105 * packet length once the packet has been constucted. This saves 106 * fragile math. 107 */ 108 buffer_put_int(&log_msg, 0); 109 110 buffer_put_int(&log_msg, level); 111 buffer_put_cstring(&log_msg, msg); 112 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); 113 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), 114 buffer_len(&log_msg)) != buffer_len(&log_msg)) 115 fatal("%s: write: %s", __func__, strerror(errno)); 116 buffer_free(&log_msg); 117 } 118 119 int 120 mm_is_monitor(void) 121 { 122 /* 123 * m_pid is only set in the privileged part, and 124 * points to the unprivileged child. 125 */ 126 return (pmonitor && pmonitor->m_pid > 0); 127 } 128 129 void 130 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 131 { 132 u_int mlen = buffer_len(m); 133 u_char buf[5]; 134 135 debug3("%s entering: type %d", __func__, type); 136 137 put_u32(buf, mlen + 1); 138 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 139 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 140 fatal("%s: write: %s", __func__, strerror(errno)); 141 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 142 fatal("%s: write: %s", __func__, strerror(errno)); 143 } 144 145 void 146 mm_request_receive(int sock, Buffer *m) 147 { 148 u_char buf[4]; 149 u_int msg_len; 150 151 debug3("%s entering", __func__); 152 153 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 154 if (errno == EPIPE) 155 cleanup_exit(255); 156 fatal("%s: read: %s", __func__, strerror(errno)); 157 } 158 msg_len = get_u32(buf); 159 if (msg_len > 256 * 1024) 160 fatal("%s: read: bad msg_len %d", __func__, msg_len); 161 buffer_clear(m); 162 buffer_append_space(m, msg_len); 163 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 164 fatal("%s: read: %s", __func__, strerror(errno)); 165 } 166 167 void 168 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 169 { 170 u_char rtype; 171 172 debug3("%s entering: type %d", __func__, type); 173 174 mm_request_receive(sock, m); 175 rtype = buffer_get_char(m); 176 if (rtype != type) 177 fatal("%s: read: rtype %d != type %d", __func__, 178 rtype, type); 179 } 180 181 #ifdef WITH_OPENSSL 182 DH * 183 mm_choose_dh(int min, int nbits, int max) 184 { 185 BIGNUM *p, *g; 186 int success = 0; 187 Buffer m; 188 189 buffer_init(&m); 190 buffer_put_int(&m, min); 191 buffer_put_int(&m, nbits); 192 buffer_put_int(&m, max); 193 194 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 195 196 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 197 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 198 199 success = buffer_get_char(&m); 200 if (success == 0) 201 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 202 203 if ((p = BN_new()) == NULL) 204 fatal("%s: BN_new failed", __func__); 205 if ((g = BN_new()) == NULL) 206 fatal("%s: BN_new failed", __func__); 207 buffer_get_bignum2(&m, p); 208 buffer_get_bignum2(&m, g); 209 210 debug3("%s: remaining %d", __func__, buffer_len(&m)); 211 buffer_free(&m); 212 213 return (dh_new_group(g, p)); 214 } 215 #endif 216 217 int 218 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 219 { 220 Kex *kex = *pmonitor->m_pkex; 221 Buffer m; 222 223 debug3("%s entering", __func__); 224 225 buffer_init(&m); 226 buffer_put_int(&m, kex->host_key_index(key)); 227 buffer_put_string(&m, data, datalen); 228 229 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 230 231 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 232 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 233 *sigp = buffer_get_string(&m, lenp); 234 buffer_free(&m); 235 236 return (0); 237 } 238 239 struct passwd * 240 mm_getpwnamallow(const char *username) 241 { 242 Buffer m; 243 struct passwd *pw; 244 u_int len, i; 245 ServerOptions *newopts; 246 247 debug3("%s entering", __func__); 248 249 buffer_init(&m); 250 buffer_put_cstring(&m, username); 251 252 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 253 254 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 255 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 256 257 if (buffer_get_char(&m) == 0) { 258 pw = NULL; 259 goto out; 260 } 261 pw = buffer_get_string(&m, &len); 262 if (len != sizeof(struct passwd)) 263 fatal("%s: struct passwd size mismatch", __func__); 264 pw->pw_name = buffer_get_string(&m, NULL); 265 pw->pw_passwd = buffer_get_string(&m, NULL); 266 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 267 pw->pw_gecos = buffer_get_string(&m, NULL); 268 #endif 269 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 270 pw->pw_class = buffer_get_string(&m, NULL); 271 #endif 272 pw->pw_dir = buffer_get_string(&m, NULL); 273 pw->pw_shell = buffer_get_string(&m, NULL); 274 275 out: 276 /* copy options block as a Match directive may have changed some */ 277 newopts = buffer_get_string(&m, &len); 278 if (len != sizeof(*newopts)) 279 fatal("%s: option block size mismatch", __func__); 280 281 #define M_CP_STROPT(x) do { \ 282 if (newopts->x != NULL) \ 283 newopts->x = buffer_get_string(&m, NULL); \ 284 } while (0) 285 #define M_CP_STRARRAYOPT(x, nx) do { \ 286 for (i = 0; i < newopts->nx; i++) \ 287 newopts->x[i] = buffer_get_string(&m, NULL); \ 288 } while (0) 289 /* See comment in servconf.h */ 290 COPY_MATCH_STRING_OPTS(); 291 #undef M_CP_STROPT 292 #undef M_CP_STRARRAYOPT 293 294 copy_set_server_options(&options, newopts, 1); 295 free(newopts); 296 297 buffer_free(&m); 298 299 return (pw); 300 } 301 302 char * 303 mm_auth2_read_banner(void) 304 { 305 Buffer m; 306 char *banner; 307 308 debug3("%s entering", __func__); 309 310 buffer_init(&m); 311 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 312 buffer_clear(&m); 313 314 mm_request_receive_expect(pmonitor->m_recvfd, 315 MONITOR_ANS_AUTH2_READ_BANNER, &m); 316 banner = buffer_get_string(&m, NULL); 317 buffer_free(&m); 318 319 /* treat empty banner as missing banner */ 320 if (strlen(banner) == 0) { 321 free(banner); 322 banner = NULL; 323 } 324 return (banner); 325 } 326 327 /* Inform the privileged process about service and style */ 328 329 void 330 mm_inform_authserv(char *service, char *style) 331 { 332 Buffer m; 333 334 debug3("%s entering", __func__); 335 336 buffer_init(&m); 337 buffer_put_cstring(&m, service); 338 buffer_put_cstring(&m, style ? style : ""); 339 340 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 341 342 buffer_free(&m); 343 } 344 345 /* Do the password authentication */ 346 int 347 mm_auth_password(Authctxt *authctxt, char *password) 348 { 349 Buffer m; 350 int authenticated = 0; 351 352 debug3("%s entering", __func__); 353 354 buffer_init(&m); 355 buffer_put_cstring(&m, password); 356 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 357 358 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 359 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 360 361 authenticated = buffer_get_int(&m); 362 363 buffer_free(&m); 364 365 debug3("%s: user %sauthenticated", 366 __func__, authenticated ? "" : "not "); 367 return (authenticated); 368 } 369 370 int 371 mm_user_key_allowed(struct passwd *pw, Key *key) 372 { 373 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 374 } 375 376 int 377 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 378 Key *key) 379 { 380 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 381 } 382 383 int 384 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 385 char *host, Key *key) 386 { 387 int ret; 388 389 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 390 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 391 key->type = KEY_RSA1; 392 return (ret); 393 } 394 395 int 396 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 397 { 398 Buffer m; 399 u_char *blob; 400 u_int len; 401 int allowed = 0, have_forced = 0; 402 403 debug3("%s entering", __func__); 404 405 /* Convert the key to a blob and the pass it over */ 406 if (!key_to_blob(key, &blob, &len)) 407 return (0); 408 409 buffer_init(&m); 410 buffer_put_int(&m, type); 411 buffer_put_cstring(&m, user ? user : ""); 412 buffer_put_cstring(&m, host ? host : ""); 413 buffer_put_string(&m, blob, len); 414 free(blob); 415 416 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 417 418 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 419 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 420 421 allowed = buffer_get_int(&m); 422 423 /* fake forced command */ 424 auth_clear_options(); 425 have_forced = buffer_get_int(&m); 426 forced_command = have_forced ? xstrdup("true") : NULL; 427 428 buffer_free(&m); 429 430 return (allowed); 431 } 432 433 /* 434 * This key verify needs to send the key type along, because the 435 * privileged parent makes the decision if the key is allowed 436 * for authentication. 437 */ 438 439 int 440 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 441 { 442 Buffer m; 443 u_char *blob; 444 u_int len; 445 int verified = 0; 446 447 debug3("%s entering", __func__); 448 449 /* Convert the key to a blob and the pass it over */ 450 if (!key_to_blob(key, &blob, &len)) 451 return (0); 452 453 buffer_init(&m); 454 buffer_put_string(&m, blob, len); 455 buffer_put_string(&m, sig, siglen); 456 buffer_put_string(&m, data, datalen); 457 free(blob); 458 459 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 460 461 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 462 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 463 464 verified = buffer_get_int(&m); 465 466 buffer_free(&m); 467 468 return (verified); 469 } 470 471 /* Export key state after authentication */ 472 Newkeys * 473 mm_newkeys_from_blob(u_char *blob, int blen) 474 { 475 Buffer b; 476 u_int len; 477 Newkeys *newkey = NULL; 478 Enc *enc; 479 Mac *mac; 480 Comp *comp; 481 482 debug3("%s: %p(%d)", __func__, blob, blen); 483 #ifdef DEBUG_PK 484 dump_base64(stderr, blob, blen); 485 #endif 486 buffer_init(&b); 487 buffer_append(&b, blob, blen); 488 489 newkey = xcalloc(1, sizeof(*newkey)); 490 enc = &newkey->enc; 491 mac = &newkey->mac; 492 comp = &newkey->comp; 493 494 /* Enc structure */ 495 enc->name = buffer_get_string(&b, NULL); 496 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 497 enc->enabled = buffer_get_int(&b); 498 enc->block_size = buffer_get_int(&b); 499 enc->key = buffer_get_string(&b, &enc->key_len); 500 enc->iv = buffer_get_string(&b, &enc->iv_len); 501 502 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 503 fatal("%s: bad cipher name %s or pointer %p", __func__, 504 enc->name, enc->cipher); 505 506 /* Mac structure */ 507 if (cipher_authlen(enc->cipher) == 0) { 508 mac->name = buffer_get_string(&b, NULL); 509 if (mac->name == NULL || mac_setup(mac, mac->name) == -1) 510 fatal("%s: can not setup mac %s", __func__, mac->name); 511 mac->enabled = buffer_get_int(&b); 512 mac->key = buffer_get_string(&b, &len); 513 if (len > mac->key_len) 514 fatal("%s: bad mac key length: %u > %d", __func__, len, 515 mac->key_len); 516 mac->key_len = len; 517 } 518 519 /* Comp structure */ 520 comp->type = buffer_get_int(&b); 521 comp->enabled = buffer_get_int(&b); 522 comp->name = buffer_get_string(&b, NULL); 523 524 len = buffer_len(&b); 525 if (len != 0) 526 error("newkeys_from_blob: remaining bytes in blob %u", len); 527 buffer_free(&b); 528 return (newkey); 529 } 530 531 int 532 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 533 { 534 Buffer b; 535 int len; 536 Enc *enc; 537 Mac *mac; 538 Comp *comp; 539 Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode); 540 541 debug3("%s: converting %p", __func__, newkey); 542 543 if (newkey == NULL) { 544 error("%s: newkey == NULL", __func__); 545 return 0; 546 } 547 enc = &newkey->enc; 548 mac = &newkey->mac; 549 comp = &newkey->comp; 550 551 buffer_init(&b); 552 /* Enc structure */ 553 buffer_put_cstring(&b, enc->name); 554 /* The cipher struct is constant and shared, you export pointer */ 555 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 556 buffer_put_int(&b, enc->enabled); 557 buffer_put_int(&b, enc->block_size); 558 buffer_put_string(&b, enc->key, enc->key_len); 559 packet_get_keyiv(mode, enc->iv, enc->iv_len); 560 buffer_put_string(&b, enc->iv, enc->iv_len); 561 562 /* Mac structure */ 563 if (cipher_authlen(enc->cipher) == 0) { 564 buffer_put_cstring(&b, mac->name); 565 buffer_put_int(&b, mac->enabled); 566 buffer_put_string(&b, mac->key, mac->key_len); 567 } 568 569 /* Comp structure */ 570 buffer_put_int(&b, comp->type); 571 buffer_put_int(&b, comp->enabled); 572 buffer_put_cstring(&b, comp->name); 573 574 len = buffer_len(&b); 575 if (lenp != NULL) 576 *lenp = len; 577 if (blobp != NULL) { 578 *blobp = xmalloc(len); 579 memcpy(*blobp, buffer_ptr(&b), len); 580 } 581 explicit_bzero(buffer_ptr(&b), len); 582 buffer_free(&b); 583 return len; 584 } 585 586 static void 587 mm_send_kex(Buffer *m, Kex *kex) 588 { 589 buffer_put_string(m, kex->session_id, kex->session_id_len); 590 buffer_put_int(m, kex->we_need); 591 buffer_put_int(m, kex->hostkey_type); 592 buffer_put_int(m, kex->kex_type); 593 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 594 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 595 buffer_put_int(m, kex->flags); 596 buffer_put_cstring(m, kex->client_version_string); 597 buffer_put_cstring(m, kex->server_version_string); 598 } 599 600 void 601 mm_send_keystate(struct monitor *monitor) 602 { 603 Buffer m, *input, *output; 604 u_char *blob, *p; 605 u_int bloblen, plen; 606 u_int32_t seqnr, packets; 607 u_int64_t blocks, bytes; 608 609 buffer_init(&m); 610 611 if (!compat20) { 612 u_char iv[24]; 613 u_char *key; 614 u_int ivlen, keylen; 615 616 buffer_put_int(&m, packet_get_protocol_flags()); 617 618 buffer_put_int(&m, packet_get_ssh1_cipher()); 619 620 debug3("%s: Sending ssh1 KEY+IV", __func__); 621 keylen = packet_get_encryption_key(NULL); 622 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 623 keylen = packet_get_encryption_key(key); 624 buffer_put_string(&m, key, keylen); 625 explicit_bzero(key, keylen); 626 free(key); 627 628 ivlen = packet_get_keyiv_len(MODE_OUT); 629 packet_get_keyiv(MODE_OUT, iv, ivlen); 630 buffer_put_string(&m, iv, ivlen); 631 ivlen = packet_get_keyiv_len(MODE_IN); 632 packet_get_keyiv(MODE_IN, iv, ivlen); 633 buffer_put_string(&m, iv, ivlen); 634 goto skip; 635 } else { 636 /* Kex for rekeying */ 637 mm_send_kex(&m, *monitor->m_pkex); 638 } 639 640 debug3("%s: Sending new keys: %p %p", 641 __func__, packet_get_newkeys(MODE_OUT), 642 packet_get_newkeys(MODE_IN)); 643 644 /* Keys from Kex */ 645 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 646 fatal("%s: conversion of newkeys failed", __func__); 647 648 buffer_put_string(&m, blob, bloblen); 649 free(blob); 650 651 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 652 fatal("%s: conversion of newkeys failed", __func__); 653 654 buffer_put_string(&m, blob, bloblen); 655 free(blob); 656 657 packet_get_state(MODE_OUT, &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 packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); 663 buffer_put_int(&m, seqnr); 664 buffer_put_int64(&m, blocks); 665 buffer_put_int(&m, packets); 666 buffer_put_int64(&m, bytes); 667 668 debug3("%s: New keys have been sent", __func__); 669 skip: 670 /* More key context */ 671 plen = packet_get_keycontext(MODE_OUT, NULL); 672 p = xmalloc(plen+1); 673 packet_get_keycontext(MODE_OUT, p); 674 buffer_put_string(&m, p, plen); 675 free(p); 676 677 plen = packet_get_keycontext(MODE_IN, NULL); 678 p = xmalloc(plen+1); 679 packet_get_keycontext(MODE_IN, p); 680 buffer_put_string(&m, p, plen); 681 free(p); 682 683 /* Compression state */ 684 debug3("%s: Sending compression state", __func__); 685 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 686 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 687 688 /* Network I/O buffers */ 689 input = (Buffer *)packet_get_input(); 690 output = (Buffer *)packet_get_output(); 691 buffer_put_string(&m, buffer_ptr(input), buffer_len(input)); 692 buffer_put_string(&m, buffer_ptr(output), buffer_len(output)); 693 694 /* Roaming */ 695 if (compat20) { 696 buffer_put_int64(&m, get_sent_bytes()); 697 buffer_put_int64(&m, get_recv_bytes()); 698 } 699 700 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 701 debug3("%s: Finished sending state", __func__); 702 703 buffer_free(&m); 704 } 705 706 int 707 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 708 { 709 Buffer m; 710 char *p, *msg; 711 int success = 0, tmp1 = -1, tmp2 = -1; 712 713 /* Kludge: ensure there are fds free to receive the pty/tty */ 714 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 715 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 716 error("%s: cannot allocate fds for pty", __func__); 717 if (tmp1 > 0) 718 close(tmp1); 719 if (tmp2 > 0) 720 close(tmp2); 721 return 0; 722 } 723 close(tmp1); 724 close(tmp2); 725 726 buffer_init(&m); 727 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 728 729 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 730 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 731 732 success = buffer_get_int(&m); 733 if (success == 0) { 734 debug3("%s: pty alloc failed", __func__); 735 buffer_free(&m); 736 return (0); 737 } 738 p = buffer_get_string(&m, NULL); 739 msg = buffer_get_string(&m, NULL); 740 buffer_free(&m); 741 742 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 743 free(p); 744 745 buffer_append(&loginmsg, msg, strlen(msg)); 746 free(msg); 747 748 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 749 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 750 fatal("%s: receive fds failed", __func__); 751 752 /* Success */ 753 return (1); 754 } 755 756 void 757 mm_session_pty_cleanup2(Session *s) 758 { 759 Buffer m; 760 761 if (s->ttyfd == -1) 762 return; 763 buffer_init(&m); 764 buffer_put_cstring(&m, s->tty); 765 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 766 buffer_free(&m); 767 768 /* closed dup'ed master */ 769 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 770 error("close(s->ptymaster/%d): %s", 771 s->ptymaster, strerror(errno)); 772 773 /* unlink pty from session */ 774 s->ttyfd = -1; 775 } 776 777 #ifdef USE_PAM 778 void 779 mm_start_pam(Authctxt *authctxt) 780 { 781 Buffer m; 782 783 debug3("%s entering", __func__); 784 if (!options.use_pam) 785 fatal("UsePAM=no, but ended up in %s anyway", __func__); 786 787 buffer_init(&m); 788 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 789 790 buffer_free(&m); 791 } 792 793 u_int 794 mm_do_pam_account(void) 795 { 796 Buffer m; 797 u_int ret; 798 char *msg; 799 800 debug3("%s entering", __func__); 801 if (!options.use_pam) 802 fatal("UsePAM=no, but ended up in %s anyway", __func__); 803 804 buffer_init(&m); 805 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 806 807 mm_request_receive_expect(pmonitor->m_recvfd, 808 MONITOR_ANS_PAM_ACCOUNT, &m); 809 ret = buffer_get_int(&m); 810 msg = buffer_get_string(&m, NULL); 811 buffer_append(&loginmsg, msg, strlen(msg)); 812 free(msg); 813 814 buffer_free(&m); 815 816 debug3("%s returning %d", __func__, ret); 817 818 return (ret); 819 } 820 821 void * 822 mm_sshpam_init_ctx(Authctxt *authctxt) 823 { 824 Buffer m; 825 int success; 826 827 debug3("%s", __func__); 828 buffer_init(&m); 829 buffer_put_cstring(&m, authctxt->user); 830 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 831 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 832 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 833 success = buffer_get_int(&m); 834 if (success == 0) { 835 debug3("%s: pam_init_ctx failed", __func__); 836 buffer_free(&m); 837 return (NULL); 838 } 839 buffer_free(&m); 840 return (authctxt); 841 } 842 843 int 844 mm_sshpam_query(void *ctx, char **name, char **info, 845 u_int *num, char ***prompts, u_int **echo_on) 846 { 847 Buffer m; 848 u_int i; 849 int ret; 850 851 debug3("%s", __func__); 852 buffer_init(&m); 853 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 854 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 855 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 856 ret = buffer_get_int(&m); 857 debug3("%s: pam_query returned %d", __func__, ret); 858 *name = buffer_get_string(&m, NULL); 859 *info = buffer_get_string(&m, NULL); 860 *num = buffer_get_int(&m); 861 if (*num > PAM_MAX_NUM_MSG) 862 fatal("%s: recieved %u PAM messages, expected <= %u", 863 __func__, *num, PAM_MAX_NUM_MSG); 864 *prompts = xcalloc((*num + 1), sizeof(char *)); 865 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 866 for (i = 0; i < *num; ++i) { 867 (*prompts)[i] = buffer_get_string(&m, NULL); 868 (*echo_on)[i] = buffer_get_int(&m); 869 } 870 buffer_free(&m); 871 return (ret); 872 } 873 874 int 875 mm_sshpam_respond(void *ctx, u_int num, char **resp) 876 { 877 Buffer m; 878 u_int i; 879 int ret; 880 881 debug3("%s", __func__); 882 buffer_init(&m); 883 buffer_put_int(&m, num); 884 for (i = 0; i < num; ++i) 885 buffer_put_cstring(&m, resp[i]); 886 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 887 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 888 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 889 ret = buffer_get_int(&m); 890 debug3("%s: pam_respond returned %d", __func__, ret); 891 buffer_free(&m); 892 return (ret); 893 } 894 895 void 896 mm_sshpam_free_ctx(void *ctxtp) 897 { 898 Buffer m; 899 900 debug3("%s", __func__); 901 buffer_init(&m); 902 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 903 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 904 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 905 buffer_free(&m); 906 } 907 #endif /* USE_PAM */ 908 909 /* Request process termination */ 910 911 void 912 mm_terminate(void) 913 { 914 Buffer m; 915 916 buffer_init(&m); 917 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 918 buffer_free(&m); 919 } 920 921 #ifdef WITH_SSH1 922 int 923 mm_ssh1_session_key(BIGNUM *num) 924 { 925 int rsafail; 926 Buffer m; 927 928 buffer_init(&m); 929 buffer_put_bignum2(&m, num); 930 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 931 932 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 933 934 rsafail = buffer_get_int(&m); 935 buffer_get_bignum2(&m, num); 936 937 buffer_free(&m); 938 939 return (rsafail); 940 } 941 #endif 942 943 static void 944 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 945 char ***prompts, u_int **echo_on) 946 { 947 *name = xstrdup(""); 948 *infotxt = xstrdup(""); 949 *numprompts = 1; 950 *prompts = xcalloc(*numprompts, sizeof(char *)); 951 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 952 (*echo_on)[0] = 0; 953 } 954 955 int 956 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 957 u_int *numprompts, char ***prompts, u_int **echo_on) 958 { 959 Buffer m; 960 u_int success; 961 char *challenge; 962 963 debug3("%s: entering", __func__); 964 965 buffer_init(&m); 966 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 967 968 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 969 &m); 970 success = buffer_get_int(&m); 971 if (success == 0) { 972 debug3("%s: no challenge", __func__); 973 buffer_free(&m); 974 return (-1); 975 } 976 977 /* Get the challenge, and format the response */ 978 challenge = buffer_get_string(&m, NULL); 979 buffer_free(&m); 980 981 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 982 (*prompts)[0] = challenge; 983 984 debug3("%s: received challenge: %s", __func__, challenge); 985 986 return (0); 987 } 988 989 int 990 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 991 { 992 Buffer m; 993 int authok; 994 995 debug3("%s: entering", __func__); 996 if (numresponses != 1) 997 return (-1); 998 999 buffer_init(&m); 1000 buffer_put_cstring(&m, responses[0]); 1001 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 1002 1003 mm_request_receive_expect(pmonitor->m_recvfd, 1004 MONITOR_ANS_BSDAUTHRESPOND, &m); 1005 1006 authok = buffer_get_int(&m); 1007 buffer_free(&m); 1008 1009 return ((authok == 0) ? -1 : 0); 1010 } 1011 1012 #ifdef SKEY 1013 int 1014 mm_skey_query(void *ctx, char **name, char **infotxt, 1015 u_int *numprompts, char ***prompts, u_int **echo_on) 1016 { 1017 Buffer m; 1018 u_int success; 1019 char *challenge; 1020 1021 debug3("%s: entering", __func__); 1022 1023 buffer_init(&m); 1024 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 1025 1026 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 1027 &m); 1028 success = buffer_get_int(&m); 1029 if (success == 0) { 1030 debug3("%s: no challenge", __func__); 1031 buffer_free(&m); 1032 return (-1); 1033 } 1034 1035 /* Get the challenge, and format the response */ 1036 challenge = buffer_get_string(&m, NULL); 1037 buffer_free(&m); 1038 1039 debug3("%s: received challenge: %s", __func__, challenge); 1040 1041 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 1042 1043 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); 1044 free(challenge); 1045 1046 return (0); 1047 } 1048 1049 int 1050 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 1051 { 1052 Buffer m; 1053 int authok; 1054 1055 debug3("%s: entering", __func__); 1056 if (numresponses != 1) 1057 return (-1); 1058 1059 buffer_init(&m); 1060 buffer_put_cstring(&m, responses[0]); 1061 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 1062 1063 mm_request_receive_expect(pmonitor->m_recvfd, 1064 MONITOR_ANS_SKEYRESPOND, &m); 1065 1066 authok = buffer_get_int(&m); 1067 buffer_free(&m); 1068 1069 return ((authok == 0) ? -1 : 0); 1070 } 1071 #endif /* SKEY */ 1072 1073 void 1074 mm_ssh1_session_id(u_char session_id[16]) 1075 { 1076 Buffer m; 1077 int i; 1078 1079 debug3("%s entering", __func__); 1080 1081 buffer_init(&m); 1082 for (i = 0; i < 16; i++) 1083 buffer_put_char(&m, session_id[i]); 1084 1085 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 1086 buffer_free(&m); 1087 } 1088 1089 #ifdef WITH_SSH1 1090 int 1091 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 1092 { 1093 Buffer m; 1094 Key *key; 1095 u_char *blob; 1096 u_int blen; 1097 int allowed = 0, have_forced = 0; 1098 1099 debug3("%s entering", __func__); 1100 1101 buffer_init(&m); 1102 buffer_put_bignum2(&m, client_n); 1103 1104 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 1105 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 1106 1107 allowed = buffer_get_int(&m); 1108 1109 /* fake forced command */ 1110 auth_clear_options(); 1111 have_forced = buffer_get_int(&m); 1112 forced_command = have_forced ? xstrdup("true") : NULL; 1113 1114 if (allowed && rkey != NULL) { 1115 blob = buffer_get_string(&m, &blen); 1116 if ((key = key_from_blob(blob, blen)) == NULL) 1117 fatal("%s: key_from_blob failed", __func__); 1118 *rkey = key; 1119 free(blob); 1120 } 1121 buffer_free(&m); 1122 1123 return (allowed); 1124 } 1125 1126 BIGNUM * 1127 mm_auth_rsa_generate_challenge(Key *key) 1128 { 1129 Buffer m; 1130 BIGNUM *challenge; 1131 u_char *blob; 1132 u_int blen; 1133 1134 debug3("%s entering", __func__); 1135 1136 if ((challenge = BN_new()) == NULL) 1137 fatal("%s: BN_new failed", __func__); 1138 1139 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1140 if (key_to_blob(key, &blob, &blen) == 0) 1141 fatal("%s: key_to_blob failed", __func__); 1142 key->type = KEY_RSA1; 1143 1144 buffer_init(&m); 1145 buffer_put_string(&m, blob, blen); 1146 free(blob); 1147 1148 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 1149 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 1150 1151 buffer_get_bignum2(&m, challenge); 1152 buffer_free(&m); 1153 1154 return (challenge); 1155 } 1156 1157 int 1158 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 1159 { 1160 Buffer m; 1161 u_char *blob; 1162 u_int blen; 1163 int success = 0; 1164 1165 debug3("%s entering", __func__); 1166 1167 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1168 if (key_to_blob(key, &blob, &blen) == 0) 1169 fatal("%s: key_to_blob failed", __func__); 1170 key->type = KEY_RSA1; 1171 1172 buffer_init(&m); 1173 buffer_put_string(&m, blob, blen); 1174 buffer_put_string(&m, response, 16); 1175 free(blob); 1176 1177 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 1178 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 1179 1180 success = buffer_get_int(&m); 1181 buffer_free(&m); 1182 1183 return (success); 1184 } 1185 #endif 1186 1187 #ifdef SSH_AUDIT_EVENTS 1188 void 1189 mm_audit_event(ssh_audit_event_t event) 1190 { 1191 Buffer m; 1192 1193 debug3("%s entering", __func__); 1194 1195 buffer_init(&m); 1196 buffer_put_int(&m, event); 1197 1198 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); 1199 buffer_free(&m); 1200 } 1201 1202 void 1203 mm_audit_run_command(const char *command) 1204 { 1205 Buffer m; 1206 1207 debug3("%s entering command %s", __func__, command); 1208 1209 buffer_init(&m); 1210 buffer_put_cstring(&m, command); 1211 1212 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); 1213 buffer_free(&m); 1214 } 1215 #endif /* SSH_AUDIT_EVENTS */ 1216 1217 #ifdef GSSAPI 1218 OM_uint32 1219 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 1220 { 1221 Buffer m; 1222 OM_uint32 major; 1223 1224 /* Client doesn't get to see the context */ 1225 *ctx = NULL; 1226 1227 buffer_init(&m); 1228 buffer_put_string(&m, goid->elements, goid->length); 1229 1230 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 1231 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 1232 1233 major = buffer_get_int(&m); 1234 1235 buffer_free(&m); 1236 return (major); 1237 } 1238 1239 OM_uint32 1240 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 1241 gss_buffer_desc *out, OM_uint32 *flags) 1242 { 1243 Buffer m; 1244 OM_uint32 major; 1245 u_int len; 1246 1247 buffer_init(&m); 1248 buffer_put_string(&m, in->value, in->length); 1249 1250 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 1251 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 1252 1253 major = buffer_get_int(&m); 1254 out->value = buffer_get_string(&m, &len); 1255 out->length = len; 1256 if (flags) 1257 *flags = buffer_get_int(&m); 1258 1259 buffer_free(&m); 1260 1261 return (major); 1262 } 1263 1264 OM_uint32 1265 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 1266 { 1267 Buffer m; 1268 OM_uint32 major; 1269 1270 buffer_init(&m); 1271 buffer_put_string(&m, gssbuf->value, gssbuf->length); 1272 buffer_put_string(&m, gssmic->value, gssmic->length); 1273 1274 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 1275 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 1276 &m); 1277 1278 major = buffer_get_int(&m); 1279 buffer_free(&m); 1280 return(major); 1281 } 1282 1283 int 1284 mm_ssh_gssapi_userok(char *user) 1285 { 1286 Buffer m; 1287 int authenticated = 0; 1288 1289 buffer_init(&m); 1290 1291 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1292 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1293 &m); 1294 1295 authenticated = buffer_get_int(&m); 1296 1297 buffer_free(&m); 1298 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1299 return (authenticated); 1300 } 1301 #endif /* GSSAPI */ 1302 1303