1 /* $OpenBSD: monitor_wrap.c,v 1.68 2009/06/22 05:39:28 dtucker 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 <sys/types.h> 29 #include <sys/uio.h> 30 #include <sys/queue.h> 31 32 #include <errno.h> 33 #include <pwd.h> 34 #include <signal.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 #include <openssl/bn.h> 40 #include <openssl/dh.h> 41 #include <openssl/evp.h> 42 43 #include "xmalloc.h" 44 #include "ssh.h" 45 #include "dh.h" 46 #include "buffer.h" 47 #include "key.h" 48 #include "cipher.h" 49 #include "kex.h" 50 #include "hostfile.h" 51 #include "auth.h" 52 #include "auth-options.h" 53 #include "packet.h" 54 #include "mac.h" 55 #include "log.h" 56 #include <zlib.h> 57 #include "monitor.h" 58 #ifdef GSSAPI 59 #include "ssh-gss.h" 60 #endif 61 #include "monitor_wrap.h" 62 #include "atomicio.h" 63 #include "monitor_fdpass.h" 64 #include "misc.h" 65 #include "schnorr.h" 66 #include "jpake.h" 67 68 #include "channels.h" 69 #include "session.h" 70 #include "servconf.h" 71 #include "roaming.h" 72 73 /* Imports */ 74 extern int compat20; 75 extern z_stream incoming_stream; 76 extern z_stream outgoing_stream; 77 extern struct monitor *pmonitor; 78 extern Buffer loginmsg; 79 extern ServerOptions options; 80 81 int 82 mm_is_monitor(void) 83 { 84 /* 85 * m_pid is only set in the privileged part, and 86 * points to the unprivileged child. 87 */ 88 return (pmonitor && pmonitor->m_pid > 0); 89 } 90 91 void 92 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 93 { 94 u_int mlen = buffer_len(m); 95 u_char buf[5]; 96 97 debug3("%s entering: type %d", __func__, type); 98 99 put_u32(buf, mlen + 1); 100 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 101 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 102 fatal("%s: write: %s", __func__, strerror(errno)); 103 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 104 fatal("%s: write: %s", __func__, strerror(errno)); 105 } 106 107 void 108 mm_request_receive(int sock, Buffer *m) 109 { 110 u_char buf[4]; 111 u_int msg_len; 112 113 debug3("%s entering", __func__); 114 115 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 116 if (errno == EPIPE) 117 cleanup_exit(255); 118 fatal("%s: read: %s", __func__, strerror(errno)); 119 } 120 msg_len = get_u32(buf); 121 if (msg_len > 256 * 1024) 122 fatal("%s: read: bad msg_len %d", __func__, msg_len); 123 buffer_clear(m); 124 buffer_append_space(m, msg_len); 125 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 126 fatal("%s: read: %s", __func__, strerror(errno)); 127 } 128 129 void 130 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 131 { 132 u_char rtype; 133 134 debug3("%s entering: type %d", __func__, type); 135 136 mm_request_receive(sock, m); 137 rtype = buffer_get_char(m); 138 if (rtype != type) 139 fatal("%s: read: rtype %d != type %d", __func__, 140 rtype, type); 141 } 142 143 DH * 144 mm_choose_dh(int min, int nbits, int max) 145 { 146 BIGNUM *p, *g; 147 int success = 0; 148 Buffer m; 149 150 buffer_init(&m); 151 buffer_put_int(&m, min); 152 buffer_put_int(&m, nbits); 153 buffer_put_int(&m, max); 154 155 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 156 157 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 158 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 159 160 success = buffer_get_char(&m); 161 if (success == 0) 162 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 163 164 if ((p = BN_new()) == NULL) 165 fatal("%s: BN_new failed", __func__); 166 if ((g = BN_new()) == NULL) 167 fatal("%s: BN_new failed", __func__); 168 buffer_get_bignum2(&m, p); 169 buffer_get_bignum2(&m, g); 170 171 debug3("%s: remaining %d", __func__, buffer_len(&m)); 172 buffer_free(&m); 173 174 return (dh_new_group(g, p)); 175 } 176 177 int 178 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 179 { 180 Kex *kex = *pmonitor->m_pkex; 181 Buffer m; 182 183 debug3("%s entering", __func__); 184 185 buffer_init(&m); 186 buffer_put_int(&m, kex->host_key_index(key)); 187 buffer_put_string(&m, data, datalen); 188 189 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 190 191 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 192 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 193 *sigp = buffer_get_string(&m, lenp); 194 buffer_free(&m); 195 196 return (0); 197 } 198 199 struct passwd * 200 mm_getpwnamallow(const char *username) 201 { 202 Buffer m; 203 struct passwd *pw; 204 u_int len; 205 ServerOptions *newopts; 206 207 debug3("%s entering", __func__); 208 209 buffer_init(&m); 210 buffer_put_cstring(&m, username); 211 212 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 213 214 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 215 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 216 217 if (buffer_get_char(&m) == 0) { 218 pw = NULL; 219 goto out; 220 } 221 pw = buffer_get_string(&m, &len); 222 if (len != sizeof(struct passwd)) 223 fatal("%s: struct passwd size mismatch", __func__); 224 pw->pw_name = buffer_get_string(&m, NULL); 225 pw->pw_passwd = buffer_get_string(&m, NULL); 226 pw->pw_gecos = buffer_get_string(&m, NULL); 227 pw->pw_class = buffer_get_string(&m, NULL); 228 pw->pw_dir = buffer_get_string(&m, NULL); 229 pw->pw_shell = buffer_get_string(&m, NULL); 230 231 out: 232 /* copy options block as a Match directive may have changed some */ 233 newopts = buffer_get_string(&m, &len); 234 if (len != sizeof(*newopts)) 235 fatal("%s: option block size mismatch", __func__); 236 if (newopts->banner != NULL) 237 newopts->banner = buffer_get_string(&m, NULL); 238 copy_set_server_options(&options, newopts, 1); 239 xfree(newopts); 240 241 buffer_free(&m); 242 243 return (pw); 244 } 245 246 char * 247 mm_auth2_read_banner(void) 248 { 249 Buffer m; 250 char *banner; 251 252 debug3("%s entering", __func__); 253 254 buffer_init(&m); 255 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 256 buffer_clear(&m); 257 258 mm_request_receive_expect(pmonitor->m_recvfd, 259 MONITOR_ANS_AUTH2_READ_BANNER, &m); 260 banner = buffer_get_string(&m, NULL); 261 buffer_free(&m); 262 263 /* treat empty banner as missing banner */ 264 if (strlen(banner) == 0) { 265 xfree(banner); 266 banner = NULL; 267 } 268 return (banner); 269 } 270 271 /* Inform the privileged process about service and style */ 272 273 void 274 mm_inform_authserv(char *service, char *style) 275 { 276 Buffer m; 277 278 debug3("%s entering", __func__); 279 280 buffer_init(&m); 281 buffer_put_cstring(&m, service); 282 buffer_put_cstring(&m, style ? style : ""); 283 284 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 285 286 buffer_free(&m); 287 } 288 289 /* Do the password authentication */ 290 int 291 mm_auth_password(Authctxt *authctxt, char *password) 292 { 293 Buffer m; 294 int authenticated = 0; 295 296 debug3("%s entering", __func__); 297 298 buffer_init(&m); 299 buffer_put_cstring(&m, password); 300 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 301 302 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 303 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 304 305 authenticated = buffer_get_int(&m); 306 307 buffer_free(&m); 308 309 debug3("%s: user %sauthenticated", 310 __func__, authenticated ? "" : "not "); 311 return (authenticated); 312 } 313 314 int 315 mm_user_key_allowed(struct passwd *pw, Key *key) 316 { 317 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 318 } 319 320 int 321 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 322 Key *key) 323 { 324 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 325 } 326 327 int 328 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 329 char *host, Key *key) 330 { 331 int ret; 332 333 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 334 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 335 key->type = KEY_RSA1; 336 return (ret); 337 } 338 339 static void 340 mm_send_debug(Buffer *m) 341 { 342 char *msg; 343 344 while (buffer_len(m)) { 345 msg = buffer_get_string(m, NULL); 346 debug3("%s: Sending debug: %s", __func__, msg); 347 packet_send_debug("%s", msg); 348 xfree(msg); 349 } 350 } 351 352 int 353 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 354 { 355 Buffer m; 356 u_char *blob; 357 u_int len; 358 int allowed = 0, have_forced = 0; 359 360 debug3("%s entering", __func__); 361 362 /* Convert the key to a blob and the pass it over */ 363 if (!key_to_blob(key, &blob, &len)) 364 return (0); 365 366 buffer_init(&m); 367 buffer_put_int(&m, type); 368 buffer_put_cstring(&m, user ? user : ""); 369 buffer_put_cstring(&m, host ? host : ""); 370 buffer_put_string(&m, blob, len); 371 xfree(blob); 372 373 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 374 375 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 376 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 377 378 allowed = buffer_get_int(&m); 379 380 /* fake forced command */ 381 auth_clear_options(); 382 have_forced = buffer_get_int(&m); 383 forced_command = have_forced ? xstrdup("true") : NULL; 384 385 /* Send potential debug messages */ 386 mm_send_debug(&m); 387 388 buffer_free(&m); 389 390 return (allowed); 391 } 392 393 /* 394 * This key verify needs to send the key type along, because the 395 * privileged parent makes the decision if the key is allowed 396 * for authentication. 397 */ 398 399 int 400 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 401 { 402 Buffer m; 403 u_char *blob; 404 u_int len; 405 int verified = 0; 406 407 debug3("%s entering", __func__); 408 409 /* Convert the key to a blob and the pass it over */ 410 if (!key_to_blob(key, &blob, &len)) 411 return (0); 412 413 buffer_init(&m); 414 buffer_put_string(&m, blob, len); 415 buffer_put_string(&m, sig, siglen); 416 buffer_put_string(&m, data, datalen); 417 xfree(blob); 418 419 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 420 421 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 422 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 423 424 verified = buffer_get_int(&m); 425 426 buffer_free(&m); 427 428 return (verified); 429 } 430 431 /* Export key state after authentication */ 432 Newkeys * 433 mm_newkeys_from_blob(u_char *blob, int blen) 434 { 435 Buffer b; 436 u_int len; 437 Newkeys *newkey = NULL; 438 Enc *enc; 439 Mac *mac; 440 Comp *comp; 441 442 debug3("%s: %p(%d)", __func__, blob, blen); 443 #ifdef DEBUG_PK 444 dump_base64(stderr, blob, blen); 445 #endif 446 buffer_init(&b); 447 buffer_append(&b, blob, blen); 448 449 newkey = xmalloc(sizeof(*newkey)); 450 enc = &newkey->enc; 451 mac = &newkey->mac; 452 comp = &newkey->comp; 453 454 /* Enc structure */ 455 enc->name = buffer_get_string(&b, NULL); 456 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 457 enc->enabled = buffer_get_int(&b); 458 enc->block_size = buffer_get_int(&b); 459 enc->key = buffer_get_string(&b, &enc->key_len); 460 enc->iv = buffer_get_string(&b, &len); 461 if (len != enc->block_size) 462 fatal("%s: bad ivlen: expected %u != %u", __func__, 463 enc->block_size, len); 464 465 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 466 fatal("%s: bad cipher name %s or pointer %p", __func__, 467 enc->name, enc->cipher); 468 469 /* Mac structure */ 470 mac->name = buffer_get_string(&b, NULL); 471 if (mac->name == NULL || mac_setup(mac, mac->name) == -1) 472 fatal("%s: can not setup mac %s", __func__, mac->name); 473 mac->enabled = buffer_get_int(&b); 474 mac->key = buffer_get_string(&b, &len); 475 if (len > mac->key_len) 476 fatal("%s: bad mac key length: %u > %d", __func__, len, 477 mac->key_len); 478 mac->key_len = len; 479 480 /* Comp structure */ 481 comp->type = buffer_get_int(&b); 482 comp->enabled = buffer_get_int(&b); 483 comp->name = buffer_get_string(&b, NULL); 484 485 len = buffer_len(&b); 486 if (len != 0) 487 error("newkeys_from_blob: remaining bytes in blob %u", len); 488 buffer_free(&b); 489 return (newkey); 490 } 491 492 int 493 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 494 { 495 Buffer b; 496 int len; 497 Enc *enc; 498 Mac *mac; 499 Comp *comp; 500 Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode); 501 502 debug3("%s: converting %p", __func__, newkey); 503 504 if (newkey == NULL) { 505 error("%s: newkey == NULL", __func__); 506 return 0; 507 } 508 enc = &newkey->enc; 509 mac = &newkey->mac; 510 comp = &newkey->comp; 511 512 buffer_init(&b); 513 /* Enc structure */ 514 buffer_put_cstring(&b, enc->name); 515 /* The cipher struct is constant and shared, you export pointer */ 516 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 517 buffer_put_int(&b, enc->enabled); 518 buffer_put_int(&b, enc->block_size); 519 buffer_put_string(&b, enc->key, enc->key_len); 520 packet_get_keyiv(mode, enc->iv, enc->block_size); 521 buffer_put_string(&b, enc->iv, enc->block_size); 522 523 /* Mac structure */ 524 buffer_put_cstring(&b, mac->name); 525 buffer_put_int(&b, mac->enabled); 526 buffer_put_string(&b, mac->key, mac->key_len); 527 528 /* Comp structure */ 529 buffer_put_int(&b, comp->type); 530 buffer_put_int(&b, comp->enabled); 531 buffer_put_cstring(&b, comp->name); 532 533 len = buffer_len(&b); 534 if (lenp != NULL) 535 *lenp = len; 536 if (blobp != NULL) { 537 *blobp = xmalloc(len); 538 memcpy(*blobp, buffer_ptr(&b), len); 539 } 540 memset(buffer_ptr(&b), 0, len); 541 buffer_free(&b); 542 return len; 543 } 544 545 static void 546 mm_send_kex(Buffer *m, Kex *kex) 547 { 548 buffer_put_string(m, kex->session_id, kex->session_id_len); 549 buffer_put_int(m, kex->we_need); 550 buffer_put_int(m, kex->hostkey_type); 551 buffer_put_int(m, kex->kex_type); 552 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 553 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 554 buffer_put_int(m, kex->flags); 555 buffer_put_cstring(m, kex->client_version_string); 556 buffer_put_cstring(m, kex->server_version_string); 557 } 558 559 void 560 mm_send_keystate(struct monitor *monitor) 561 { 562 Buffer m, *input, *output; 563 u_char *blob, *p; 564 u_int bloblen, plen; 565 u_int32_t seqnr, packets; 566 u_int64_t blocks, bytes; 567 568 buffer_init(&m); 569 570 if (!compat20) { 571 u_char iv[24]; 572 u_char *key; 573 u_int ivlen, keylen; 574 575 buffer_put_int(&m, packet_get_protocol_flags()); 576 577 buffer_put_int(&m, packet_get_ssh1_cipher()); 578 579 debug3("%s: Sending ssh1 KEY+IV", __func__); 580 keylen = packet_get_encryption_key(NULL); 581 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 582 keylen = packet_get_encryption_key(key); 583 buffer_put_string(&m, key, keylen); 584 memset(key, 0, keylen); 585 xfree(key); 586 587 ivlen = packet_get_keyiv_len(MODE_OUT); 588 packet_get_keyiv(MODE_OUT, iv, ivlen); 589 buffer_put_string(&m, iv, ivlen); 590 ivlen = packet_get_keyiv_len(MODE_OUT); 591 packet_get_keyiv(MODE_IN, iv, ivlen); 592 buffer_put_string(&m, iv, ivlen); 593 goto skip; 594 } else { 595 /* Kex for rekeying */ 596 mm_send_kex(&m, *monitor->m_pkex); 597 } 598 599 debug3("%s: Sending new keys: %p %p", 600 __func__, packet_get_newkeys(MODE_OUT), 601 packet_get_newkeys(MODE_IN)); 602 603 /* Keys from Kex */ 604 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 605 fatal("%s: conversion of newkeys failed", __func__); 606 607 buffer_put_string(&m, blob, bloblen); 608 xfree(blob); 609 610 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 611 fatal("%s: conversion of newkeys failed", __func__); 612 613 buffer_put_string(&m, blob, bloblen); 614 xfree(blob); 615 616 packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); 617 buffer_put_int(&m, seqnr); 618 buffer_put_int64(&m, blocks); 619 buffer_put_int(&m, packets); 620 buffer_put_int64(&m, bytes); 621 packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); 622 buffer_put_int(&m, seqnr); 623 buffer_put_int64(&m, blocks); 624 buffer_put_int(&m, packets); 625 buffer_put_int64(&m, bytes); 626 627 debug3("%s: New keys have been sent", __func__); 628 skip: 629 /* More key context */ 630 plen = packet_get_keycontext(MODE_OUT, NULL); 631 p = xmalloc(plen+1); 632 packet_get_keycontext(MODE_OUT, p); 633 buffer_put_string(&m, p, plen); 634 xfree(p); 635 636 plen = packet_get_keycontext(MODE_IN, NULL); 637 p = xmalloc(plen+1); 638 packet_get_keycontext(MODE_IN, p); 639 buffer_put_string(&m, p, plen); 640 xfree(p); 641 642 /* Compression state */ 643 debug3("%s: Sending compression state", __func__); 644 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 645 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 646 647 /* Network I/O buffers */ 648 input = (Buffer *)packet_get_input(); 649 output = (Buffer *)packet_get_output(); 650 buffer_put_string(&m, buffer_ptr(input), buffer_len(input)); 651 buffer_put_string(&m, buffer_ptr(output), buffer_len(output)); 652 653 /* Roaming */ 654 if (compat20) { 655 buffer_put_int64(&m, get_sent_bytes()); 656 buffer_put_int64(&m, get_recv_bytes()); 657 } 658 659 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 660 debug3("%s: Finished sending state", __func__); 661 662 buffer_free(&m); 663 } 664 665 int 666 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 667 { 668 Buffer m; 669 char *p, *msg; 670 int success = 0, tmp1 = -1, tmp2 = -1; 671 672 /* Kludge: ensure there are fds free to receive the pty/tty */ 673 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 674 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 675 error("%s: cannot allocate fds for pty", __func__); 676 if (tmp1 > 0) 677 close(tmp1); 678 if (tmp2 > 0) 679 close(tmp2); 680 return 0; 681 } 682 close(tmp1); 683 close(tmp2); 684 685 buffer_init(&m); 686 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 687 688 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 689 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 690 691 success = buffer_get_int(&m); 692 if (success == 0) { 693 debug3("%s: pty alloc failed", __func__); 694 buffer_free(&m); 695 return (0); 696 } 697 p = buffer_get_string(&m, NULL); 698 msg = buffer_get_string(&m, NULL); 699 buffer_free(&m); 700 701 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 702 xfree(p); 703 704 buffer_append(&loginmsg, msg, strlen(msg)); 705 xfree(msg); 706 707 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 708 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 709 fatal("%s: receive fds failed", __func__); 710 711 /* Success */ 712 return (1); 713 } 714 715 void 716 mm_session_pty_cleanup2(Session *s) 717 { 718 Buffer m; 719 720 if (s->ttyfd == -1) 721 return; 722 buffer_init(&m); 723 buffer_put_cstring(&m, s->tty); 724 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 725 buffer_free(&m); 726 727 /* closed dup'ed master */ 728 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 729 error("close(s->ptymaster/%d): %s", 730 s->ptymaster, strerror(errno)); 731 732 /* unlink pty from session */ 733 s->ttyfd = -1; 734 } 735 736 /* Request process termination */ 737 738 void 739 mm_terminate(void) 740 { 741 Buffer m; 742 743 buffer_init(&m); 744 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 745 buffer_free(&m); 746 } 747 748 int 749 mm_ssh1_session_key(BIGNUM *num) 750 { 751 int rsafail; 752 Buffer m; 753 754 buffer_init(&m); 755 buffer_put_bignum2(&m, num); 756 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 757 758 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 759 760 rsafail = buffer_get_int(&m); 761 buffer_get_bignum2(&m, num); 762 763 buffer_free(&m); 764 765 return (rsafail); 766 } 767 768 static void 769 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 770 char ***prompts, u_int **echo_on) 771 { 772 *name = xstrdup(""); 773 *infotxt = xstrdup(""); 774 *numprompts = 1; 775 *prompts = xcalloc(*numprompts, sizeof(char *)); 776 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 777 (*echo_on)[0] = 0; 778 } 779 780 int 781 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 782 u_int *numprompts, char ***prompts, u_int **echo_on) 783 { 784 Buffer m; 785 u_int success; 786 char *challenge; 787 788 debug3("%s: entering", __func__); 789 790 buffer_init(&m); 791 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 792 793 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 794 &m); 795 success = buffer_get_int(&m); 796 if (success == 0) { 797 debug3("%s: no challenge", __func__); 798 buffer_free(&m); 799 return (-1); 800 } 801 802 /* Get the challenge, and format the response */ 803 challenge = buffer_get_string(&m, NULL); 804 buffer_free(&m); 805 806 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 807 (*prompts)[0] = challenge; 808 809 debug3("%s: received challenge: %s", __func__, challenge); 810 811 return (0); 812 } 813 814 int 815 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 816 { 817 Buffer m; 818 int authok; 819 820 debug3("%s: entering", __func__); 821 if (numresponses != 1) 822 return (-1); 823 824 buffer_init(&m); 825 buffer_put_cstring(&m, responses[0]); 826 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 827 828 mm_request_receive_expect(pmonitor->m_recvfd, 829 MONITOR_ANS_BSDAUTHRESPOND, &m); 830 831 authok = buffer_get_int(&m); 832 buffer_free(&m); 833 834 return ((authok == 0) ? -1 : 0); 835 } 836 837 838 void 839 mm_ssh1_session_id(u_char session_id[16]) 840 { 841 Buffer m; 842 int i; 843 844 debug3("%s entering", __func__); 845 846 buffer_init(&m); 847 for (i = 0; i < 16; i++) 848 buffer_put_char(&m, session_id[i]); 849 850 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 851 buffer_free(&m); 852 } 853 854 int 855 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 856 { 857 Buffer m; 858 Key *key; 859 u_char *blob; 860 u_int blen; 861 int allowed = 0, have_forced = 0; 862 863 debug3("%s entering", __func__); 864 865 buffer_init(&m); 866 buffer_put_bignum2(&m, client_n); 867 868 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 869 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 870 871 allowed = buffer_get_int(&m); 872 873 /* fake forced command */ 874 auth_clear_options(); 875 have_forced = buffer_get_int(&m); 876 forced_command = have_forced ? xstrdup("true") : NULL; 877 878 if (allowed && rkey != NULL) { 879 blob = buffer_get_string(&m, &blen); 880 if ((key = key_from_blob(blob, blen)) == NULL) 881 fatal("%s: key_from_blob failed", __func__); 882 *rkey = key; 883 xfree(blob); 884 } 885 mm_send_debug(&m); 886 buffer_free(&m); 887 888 return (allowed); 889 } 890 891 BIGNUM * 892 mm_auth_rsa_generate_challenge(Key *key) 893 { 894 Buffer m; 895 BIGNUM *challenge; 896 u_char *blob; 897 u_int blen; 898 899 debug3("%s entering", __func__); 900 901 if ((challenge = BN_new()) == NULL) 902 fatal("%s: BN_new failed", __func__); 903 904 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 905 if (key_to_blob(key, &blob, &blen) == 0) 906 fatal("%s: key_to_blob failed", __func__); 907 key->type = KEY_RSA1; 908 909 buffer_init(&m); 910 buffer_put_string(&m, blob, blen); 911 xfree(blob); 912 913 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 914 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 915 916 buffer_get_bignum2(&m, challenge); 917 buffer_free(&m); 918 919 return (challenge); 920 } 921 922 int 923 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 924 { 925 Buffer m; 926 u_char *blob; 927 u_int blen; 928 int success = 0; 929 930 debug3("%s entering", __func__); 931 932 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 933 if (key_to_blob(key, &blob, &blen) == 0) 934 fatal("%s: key_to_blob failed", __func__); 935 key->type = KEY_RSA1; 936 937 buffer_init(&m); 938 buffer_put_string(&m, blob, blen); 939 buffer_put_string(&m, response, 16); 940 xfree(blob); 941 942 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 943 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 944 945 success = buffer_get_int(&m); 946 buffer_free(&m); 947 948 return (success); 949 } 950 951 #ifdef GSSAPI 952 OM_uint32 953 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 954 { 955 Buffer m; 956 OM_uint32 major; 957 958 /* Client doesn't get to see the context */ 959 *ctx = NULL; 960 961 buffer_init(&m); 962 buffer_put_string(&m, goid->elements, goid->length); 963 964 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 965 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 966 967 major = buffer_get_int(&m); 968 969 buffer_free(&m); 970 return (major); 971 } 972 973 OM_uint32 974 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 975 gss_buffer_desc *out, OM_uint32 *flags) 976 { 977 Buffer m; 978 OM_uint32 major; 979 u_int len; 980 981 buffer_init(&m); 982 buffer_put_string(&m, in->value, in->length); 983 984 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 985 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 986 987 major = buffer_get_int(&m); 988 out->value = buffer_get_string(&m, &len); 989 out->length = len; 990 if (flags) 991 *flags = buffer_get_int(&m); 992 993 buffer_free(&m); 994 995 return (major); 996 } 997 998 OM_uint32 999 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 1000 { 1001 Buffer m; 1002 OM_uint32 major; 1003 1004 buffer_init(&m); 1005 buffer_put_string(&m, gssbuf->value, gssbuf->length); 1006 buffer_put_string(&m, gssmic->value, gssmic->length); 1007 1008 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 1009 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 1010 &m); 1011 1012 major = buffer_get_int(&m); 1013 buffer_free(&m); 1014 return(major); 1015 } 1016 1017 int 1018 mm_ssh_gssapi_userok(char *user) 1019 { 1020 Buffer m; 1021 int authenticated = 0; 1022 1023 buffer_init(&m); 1024 1025 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 1026 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 1027 &m); 1028 1029 authenticated = buffer_get_int(&m); 1030 1031 buffer_free(&m); 1032 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 1033 return (authenticated); 1034 } 1035 #endif /* GSSAPI */ 1036 1037 #ifdef JPAKE 1038 void 1039 mm_auth2_jpake_get_pwdata(Authctxt *authctxt, BIGNUM **s, 1040 char **hash_scheme, char **salt) 1041 { 1042 Buffer m; 1043 1044 debug3("%s entering", __func__); 1045 1046 buffer_init(&m); 1047 mm_request_send(pmonitor->m_recvfd, 1048 MONITOR_REQ_JPAKE_GET_PWDATA, &m); 1049 1050 debug3("%s: waiting for MONITOR_ANS_JPAKE_GET_PWDATA", __func__); 1051 mm_request_receive_expect(pmonitor->m_recvfd, 1052 MONITOR_ANS_JPAKE_GET_PWDATA, &m); 1053 1054 *hash_scheme = buffer_get_string(&m, NULL); 1055 *salt = buffer_get_string(&m, NULL); 1056 1057 buffer_free(&m); 1058 } 1059 1060 void 1061 mm_jpake_step1(struct modp_group *grp, 1062 u_char **id, u_int *id_len, 1063 BIGNUM **priv1, BIGNUM **priv2, BIGNUM **g_priv1, BIGNUM **g_priv2, 1064 u_char **priv1_proof, u_int *priv1_proof_len, 1065 u_char **priv2_proof, u_int *priv2_proof_len) 1066 { 1067 Buffer m; 1068 1069 debug3("%s entering", __func__); 1070 1071 buffer_init(&m); 1072 mm_request_send(pmonitor->m_recvfd, 1073 MONITOR_REQ_JPAKE_STEP1, &m); 1074 1075 debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP1", __func__); 1076 mm_request_receive_expect(pmonitor->m_recvfd, 1077 MONITOR_ANS_JPAKE_STEP1, &m); 1078 1079 if ((*priv1 = BN_new()) == NULL || 1080 (*priv2 = BN_new()) == NULL || 1081 (*g_priv1 = BN_new()) == NULL || 1082 (*g_priv2 = BN_new()) == NULL) 1083 fatal("%s: BN_new", __func__); 1084 1085 *id = buffer_get_string(&m, id_len); 1086 /* priv1 and priv2 are, well, private */ 1087 buffer_get_bignum2(&m, *g_priv1); 1088 buffer_get_bignum2(&m, *g_priv2); 1089 *priv1_proof = buffer_get_string(&m, priv1_proof_len); 1090 *priv2_proof = buffer_get_string(&m, priv2_proof_len); 1091 1092 buffer_free(&m); 1093 } 1094 1095 void 1096 mm_jpake_step2(struct modp_group *grp, BIGNUM *s, 1097 BIGNUM *mypub1, BIGNUM *theirpub1, BIGNUM *theirpub2, BIGNUM *mypriv2, 1098 const u_char *theirid, u_int theirid_len, 1099 const u_char *myid, u_int myid_len, 1100 const u_char *theirpub1_proof, u_int theirpub1_proof_len, 1101 const u_char *theirpub2_proof, u_int theirpub2_proof_len, 1102 BIGNUM **newpub, 1103 u_char **newpub_exponent_proof, u_int *newpub_exponent_proof_len) 1104 { 1105 Buffer m; 1106 1107 debug3("%s entering", __func__); 1108 1109 buffer_init(&m); 1110 /* monitor already has all bignums except theirpub1, theirpub2 */ 1111 buffer_put_bignum2(&m, theirpub1); 1112 buffer_put_bignum2(&m, theirpub2); 1113 /* monitor already knows our id */ 1114 buffer_put_string(&m, theirid, theirid_len); 1115 buffer_put_string(&m, theirpub1_proof, theirpub1_proof_len); 1116 buffer_put_string(&m, theirpub2_proof, theirpub2_proof_len); 1117 1118 mm_request_send(pmonitor->m_recvfd, 1119 MONITOR_REQ_JPAKE_STEP2, &m); 1120 1121 debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP2", __func__); 1122 mm_request_receive_expect(pmonitor->m_recvfd, 1123 MONITOR_ANS_JPAKE_STEP2, &m); 1124 1125 if ((*newpub = BN_new()) == NULL) 1126 fatal("%s: BN_new", __func__); 1127 1128 buffer_get_bignum2(&m, *newpub); 1129 *newpub_exponent_proof = buffer_get_string(&m, 1130 newpub_exponent_proof_len); 1131 1132 buffer_free(&m); 1133 } 1134 1135 void 1136 mm_jpake_key_confirm(struct modp_group *grp, BIGNUM *s, BIGNUM *step2_val, 1137 BIGNUM *mypriv2, BIGNUM *mypub1, BIGNUM *mypub2, 1138 BIGNUM *theirpub1, BIGNUM *theirpub2, 1139 const u_char *my_id, u_int my_id_len, 1140 const u_char *their_id, u_int their_id_len, 1141 const u_char *sess_id, u_int sess_id_len, 1142 const u_char *theirpriv2_s_proof, u_int theirpriv2_s_proof_len, 1143 BIGNUM **k, 1144 u_char **confirm_hash, u_int *confirm_hash_len) 1145 { 1146 Buffer m; 1147 1148 debug3("%s entering", __func__); 1149 1150 buffer_init(&m); 1151 /* monitor already has all bignums except step2_val */ 1152 buffer_put_bignum2(&m, step2_val); 1153 /* monitor already knows all the ids */ 1154 buffer_put_string(&m, theirpriv2_s_proof, theirpriv2_s_proof_len); 1155 1156 mm_request_send(pmonitor->m_recvfd, 1157 MONITOR_REQ_JPAKE_KEY_CONFIRM, &m); 1158 1159 debug3("%s: waiting for MONITOR_ANS_JPAKE_KEY_CONFIRM", __func__); 1160 mm_request_receive_expect(pmonitor->m_recvfd, 1161 MONITOR_ANS_JPAKE_KEY_CONFIRM, &m); 1162 1163 /* 'k' is sensitive and stays in the monitor */ 1164 *confirm_hash = buffer_get_string(&m, confirm_hash_len); 1165 1166 buffer_free(&m); 1167 } 1168 1169 int 1170 mm_jpake_check_confirm(const BIGNUM *k, 1171 const u_char *peer_id, u_int peer_id_len, 1172 const u_char *sess_id, u_int sess_id_len, 1173 const u_char *peer_confirm_hash, u_int peer_confirm_hash_len) 1174 { 1175 Buffer m; 1176 int success = 0; 1177 1178 debug3("%s entering", __func__); 1179 1180 buffer_init(&m); 1181 /* k is dummy in slave, ignored */ 1182 /* monitor knows all the ids */ 1183 buffer_put_string(&m, peer_confirm_hash, peer_confirm_hash_len); 1184 mm_request_send(pmonitor->m_recvfd, 1185 MONITOR_REQ_JPAKE_CHECK_CONFIRM, &m); 1186 1187 debug3("%s: waiting for MONITOR_ANS_JPAKE_CHECK_CONFIRM", __func__); 1188 mm_request_receive_expect(pmonitor->m_recvfd, 1189 MONITOR_ANS_JPAKE_CHECK_CONFIRM, &m); 1190 1191 success = buffer_get_int(&m); 1192 buffer_free(&m); 1193 1194 debug3("%s: success = %d", __func__, success); 1195 return success; 1196 } 1197 #endif /* JPAKE */ 1198