1 /* 2 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 3 * Copyright 2002 Markus Friedl <markus@openbsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "includes.h" 28 RCSID("$OpenBSD: monitor_wrap.c,v 1.24 2003/04/01 10:22:21 markus Exp $"); 29 RCSID("$FreeBSD$"); 30 31 #include <openssl/bn.h> 32 #include <openssl/dh.h> 33 34 #include "ssh.h" 35 #include "dh.h" 36 #include "kex.h" 37 #include "auth.h" 38 #include "auth-options.h" 39 #include "buffer.h" 40 #include "bufaux.h" 41 #include "packet.h" 42 #include "mac.h" 43 #include "log.h" 44 #include "zlib.h" 45 #include "monitor.h" 46 #include "monitor_wrap.h" 47 #include "xmalloc.h" 48 #include "atomicio.h" 49 #include "monitor_fdpass.h" 50 #include "getput.h" 51 52 #include "auth.h" 53 #include "channels.h" 54 #include "session.h" 55 56 /* Imports */ 57 extern int compat20; 58 extern Newkeys *newkeys[]; 59 extern z_stream incoming_stream; 60 extern z_stream outgoing_stream; 61 extern struct monitor *pmonitor; 62 extern Buffer input, output; 63 64 void 65 mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) 66 { 67 u_int mlen = buffer_len(m); 68 u_char buf[5]; 69 70 debug3("%s entering: type %d", __func__, type); 71 72 PUT_32BIT(buf, mlen + 1); 73 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 74 if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf)) 75 fatal("%s: write", __func__); 76 if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen) 77 fatal("%s: write", __func__); 78 } 79 80 void 81 mm_request_receive(int socket, Buffer *m) 82 { 83 u_char buf[4]; 84 u_int msg_len; 85 ssize_t res; 86 87 debug3("%s entering", __func__); 88 89 res = atomicio(read, socket, buf, sizeof(buf)); 90 if (res != sizeof(buf)) { 91 if (res == 0) 92 fatal_cleanup(); 93 fatal("%s: read: %ld", __func__, (long)res); 94 } 95 msg_len = GET_32BIT(buf); 96 if (msg_len > 256 * 1024) 97 fatal("%s: read: bad msg_len %d", __func__, msg_len); 98 buffer_clear(m); 99 buffer_append_space(m, msg_len); 100 res = atomicio(read, socket, buffer_ptr(m), msg_len); 101 if (res != msg_len) 102 fatal("%s: read: %ld != msg_len", __func__, (long)res); 103 } 104 105 void 106 mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m) 107 { 108 u_char rtype; 109 110 debug3("%s entering: type %d", __func__, type); 111 112 mm_request_receive(socket, m); 113 rtype = buffer_get_char(m); 114 if (rtype != type) 115 fatal("%s: read: rtype %d != type %d", __func__, 116 rtype, type); 117 } 118 119 DH * 120 mm_choose_dh(int min, int nbits, int max) 121 { 122 BIGNUM *p, *g; 123 int success = 0; 124 Buffer m; 125 126 buffer_init(&m); 127 buffer_put_int(&m, min); 128 buffer_put_int(&m, nbits); 129 buffer_put_int(&m, max); 130 131 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 132 133 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 134 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 135 136 success = buffer_get_char(&m); 137 if (success == 0) 138 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 139 140 if ((p = BN_new()) == NULL) 141 fatal("%s: BN_new failed", __func__); 142 if ((g = BN_new()) == NULL) 143 fatal("%s: BN_new failed", __func__); 144 buffer_get_bignum2(&m, p); 145 buffer_get_bignum2(&m, g); 146 147 debug3("%s: remaining %d", __func__, buffer_len(&m)); 148 buffer_free(&m); 149 150 return (dh_new_group(g, p)); 151 } 152 153 int 154 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 155 { 156 Kex *kex = *pmonitor->m_pkex; 157 Buffer m; 158 159 debug3("%s entering", __func__); 160 161 buffer_init(&m); 162 buffer_put_int(&m, kex->host_key_index(key)); 163 buffer_put_string(&m, data, datalen); 164 165 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 166 167 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 168 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 169 *sigp = buffer_get_string(&m, lenp); 170 buffer_free(&m); 171 172 return (0); 173 } 174 175 struct passwd * 176 mm_getpwnamallow(const char *login) 177 { 178 Buffer m; 179 struct passwd *pw; 180 u_int pwlen; 181 182 debug3("%s entering", __func__); 183 184 buffer_init(&m); 185 buffer_put_cstring(&m, login); 186 187 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 188 189 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 190 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 191 192 if (buffer_get_char(&m) == 0) { 193 buffer_free(&m); 194 return (NULL); 195 } 196 pw = buffer_get_string(&m, &pwlen); 197 if (pwlen != sizeof(struct passwd)) 198 fatal("%s: struct passwd size mismatch", __func__); 199 pw->pw_name = buffer_get_string(&m, NULL); 200 pw->pw_passwd = buffer_get_string(&m, NULL); 201 pw->pw_gecos = buffer_get_string(&m, NULL); 202 #ifdef HAVE_PW_CLASS_IN_PASSWD 203 pw->pw_class = buffer_get_string(&m, NULL); 204 #endif 205 pw->pw_dir = buffer_get_string(&m, NULL); 206 pw->pw_shell = buffer_get_string(&m, NULL); 207 buffer_free(&m); 208 209 return (pw); 210 } 211 212 char *mm_auth2_read_banner(void) 213 { 214 Buffer m; 215 char *banner; 216 217 debug3("%s entering", __func__); 218 219 buffer_init(&m); 220 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 221 buffer_clear(&m); 222 223 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m); 224 banner = buffer_get_string(&m, NULL); 225 buffer_free(&m); 226 227 return (banner); 228 } 229 230 /* Inform the privileged process about service and style */ 231 232 void 233 mm_inform_authserv(char *service, char *style) 234 { 235 Buffer m; 236 237 debug3("%s entering", __func__); 238 239 buffer_init(&m); 240 buffer_put_cstring(&m, service); 241 buffer_put_cstring(&m, style ? style : ""); 242 243 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 244 245 buffer_free(&m); 246 } 247 248 /* Do the password authentication */ 249 int 250 mm_auth_password(Authctxt *authctxt, char *password) 251 { 252 Buffer m; 253 int authenticated = 0; 254 255 debug3("%s entering", __func__); 256 257 buffer_init(&m); 258 buffer_put_cstring(&m, password); 259 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 260 261 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 262 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 263 264 authenticated = buffer_get_int(&m); 265 266 buffer_free(&m); 267 268 debug3("%s: user %sauthenticated", 269 __func__, authenticated ? "" : "not "); 270 return (authenticated); 271 } 272 273 int 274 mm_user_key_allowed(struct passwd *pw, Key *key) 275 { 276 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 277 } 278 279 int 280 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 281 Key *key) 282 { 283 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 284 } 285 286 int 287 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 288 char *host, Key *key) 289 { 290 int ret; 291 292 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 293 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 294 key->type = KEY_RSA1; 295 return (ret); 296 } 297 298 static void 299 mm_send_debug(Buffer *m) 300 { 301 char *msg; 302 303 while (buffer_len(m)) { 304 msg = buffer_get_string(m, NULL); 305 debug3("%s: Sending debug: %s", __func__, msg); 306 packet_send_debug("%s", msg); 307 xfree(msg); 308 } 309 } 310 311 int 312 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 313 { 314 Buffer m; 315 u_char *blob; 316 u_int len; 317 int allowed = 0, have_forced = 0; 318 319 debug3("%s entering", __func__); 320 321 /* Convert the key to a blob and the pass it over */ 322 if (!key_to_blob(key, &blob, &len)) 323 return (0); 324 325 buffer_init(&m); 326 buffer_put_int(&m, type); 327 buffer_put_cstring(&m, user ? user : ""); 328 buffer_put_cstring(&m, host ? host : ""); 329 buffer_put_string(&m, blob, len); 330 xfree(blob); 331 332 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 333 334 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 335 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 336 337 allowed = buffer_get_int(&m); 338 339 /* fake forced command */ 340 auth_clear_options(); 341 have_forced = buffer_get_int(&m); 342 forced_command = have_forced ? xstrdup("true") : NULL; 343 344 /* Send potential debug messages */ 345 mm_send_debug(&m); 346 347 buffer_free(&m); 348 349 return (allowed); 350 } 351 352 /* 353 * This key verify needs to send the key type along, because the 354 * privileged parent makes the decision if the key is allowed 355 * for authentication. 356 */ 357 358 int 359 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 360 { 361 Buffer m; 362 u_char *blob; 363 u_int len; 364 int verified = 0; 365 366 debug3("%s entering", __func__); 367 368 /* Convert the key to a blob and the pass it over */ 369 if (!key_to_blob(key, &blob, &len)) 370 return (0); 371 372 buffer_init(&m); 373 buffer_put_string(&m, blob, len); 374 buffer_put_string(&m, sig, siglen); 375 buffer_put_string(&m, data, datalen); 376 xfree(blob); 377 378 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 379 380 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 381 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 382 383 verified = buffer_get_int(&m); 384 385 buffer_free(&m); 386 387 return (verified); 388 } 389 390 /* Export key state after authentication */ 391 Newkeys * 392 mm_newkeys_from_blob(u_char *blob, int blen) 393 { 394 Buffer b; 395 u_int len; 396 Newkeys *newkey = NULL; 397 Enc *enc; 398 Mac *mac; 399 Comp *comp; 400 401 debug3("%s: %p(%d)", __func__, blob, blen); 402 #ifdef DEBUG_PK 403 dump_base64(stderr, blob, blen); 404 #endif 405 buffer_init(&b); 406 buffer_append(&b, blob, blen); 407 408 newkey = xmalloc(sizeof(*newkey)); 409 enc = &newkey->enc; 410 mac = &newkey->mac; 411 comp = &newkey->comp; 412 413 /* Enc structure */ 414 enc->name = buffer_get_string(&b, NULL); 415 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 416 enc->enabled = buffer_get_int(&b); 417 enc->block_size = buffer_get_int(&b); 418 enc->key = buffer_get_string(&b, &enc->key_len); 419 enc->iv = buffer_get_string(&b, &len); 420 if (len != enc->block_size) 421 fatal("%s: bad ivlen: expected %u != %u", __func__, 422 enc->block_size, len); 423 424 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 425 fatal("%s: bad cipher name %s or pointer %p", __func__, 426 enc->name, enc->cipher); 427 428 /* Mac structure */ 429 mac->name = buffer_get_string(&b, NULL); 430 if (mac->name == NULL || mac_init(mac, mac->name) == -1) 431 fatal("%s: can not init mac %s", __func__, mac->name); 432 mac->enabled = buffer_get_int(&b); 433 mac->key = buffer_get_string(&b, &len); 434 if (len > mac->key_len) 435 fatal("%s: bad mac key length: %u > %d", __func__, len, 436 mac->key_len); 437 mac->key_len = len; 438 439 /* Comp structure */ 440 comp->type = buffer_get_int(&b); 441 comp->enabled = buffer_get_int(&b); 442 comp->name = buffer_get_string(&b, NULL); 443 444 len = buffer_len(&b); 445 if (len != 0) 446 error("newkeys_from_blob: remaining bytes in blob %u", len); 447 buffer_free(&b); 448 return (newkey); 449 } 450 451 int 452 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 453 { 454 Buffer b; 455 int len; 456 Enc *enc; 457 Mac *mac; 458 Comp *comp; 459 Newkeys *newkey = newkeys[mode]; 460 461 debug3("%s: converting %p", __func__, newkey); 462 463 if (newkey == NULL) { 464 error("%s: newkey == NULL", __func__); 465 return 0; 466 } 467 enc = &newkey->enc; 468 mac = &newkey->mac; 469 comp = &newkey->comp; 470 471 buffer_init(&b); 472 /* Enc structure */ 473 buffer_put_cstring(&b, enc->name); 474 /* The cipher struct is constant and shared, you export pointer */ 475 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 476 buffer_put_int(&b, enc->enabled); 477 buffer_put_int(&b, enc->block_size); 478 buffer_put_string(&b, enc->key, enc->key_len); 479 packet_get_keyiv(mode, enc->iv, enc->block_size); 480 buffer_put_string(&b, enc->iv, enc->block_size); 481 482 /* Mac structure */ 483 buffer_put_cstring(&b, mac->name); 484 buffer_put_int(&b, mac->enabled); 485 buffer_put_string(&b, mac->key, mac->key_len); 486 487 /* Comp structure */ 488 buffer_put_int(&b, comp->type); 489 buffer_put_int(&b, comp->enabled); 490 buffer_put_cstring(&b, comp->name); 491 492 len = buffer_len(&b); 493 if (lenp != NULL) 494 *lenp = len; 495 if (blobp != NULL) { 496 *blobp = xmalloc(len); 497 memcpy(*blobp, buffer_ptr(&b), len); 498 } 499 memset(buffer_ptr(&b), 0, len); 500 buffer_free(&b); 501 return len; 502 } 503 504 static void 505 mm_send_kex(Buffer *m, Kex *kex) 506 { 507 buffer_put_string(m, kex->session_id, kex->session_id_len); 508 buffer_put_int(m, kex->we_need); 509 buffer_put_int(m, kex->hostkey_type); 510 buffer_put_int(m, kex->kex_type); 511 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 512 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 513 buffer_put_int(m, kex->flags); 514 buffer_put_cstring(m, kex->client_version_string); 515 buffer_put_cstring(m, kex->server_version_string); 516 } 517 518 void 519 mm_send_keystate(struct monitor *pmonitor) 520 { 521 Buffer m; 522 u_char *blob, *p; 523 u_int bloblen, plen; 524 525 buffer_init(&m); 526 527 if (!compat20) { 528 u_char iv[24]; 529 u_char *key; 530 u_int ivlen, keylen; 531 532 buffer_put_int(&m, packet_get_protocol_flags()); 533 534 buffer_put_int(&m, packet_get_ssh1_cipher()); 535 536 debug3("%s: Sending ssh1 KEY+IV", __func__); 537 keylen = packet_get_encryption_key(NULL); 538 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 539 keylen = packet_get_encryption_key(key); 540 buffer_put_string(&m, key, keylen); 541 memset(key, 0, keylen); 542 xfree(key); 543 544 ivlen = packet_get_keyiv_len(MODE_OUT); 545 packet_get_keyiv(MODE_OUT, iv, ivlen); 546 buffer_put_string(&m, iv, ivlen); 547 ivlen = packet_get_keyiv_len(MODE_OUT); 548 packet_get_keyiv(MODE_IN, iv, ivlen); 549 buffer_put_string(&m, iv, ivlen); 550 goto skip; 551 } else { 552 /* Kex for rekeying */ 553 mm_send_kex(&m, *pmonitor->m_pkex); 554 } 555 556 debug3("%s: Sending new keys: %p %p", 557 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 558 559 /* Keys from Kex */ 560 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 561 fatal("%s: conversion of newkeys failed", __func__); 562 563 buffer_put_string(&m, blob, bloblen); 564 xfree(blob); 565 566 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 567 fatal("%s: conversion of newkeys failed", __func__); 568 569 buffer_put_string(&m, blob, bloblen); 570 xfree(blob); 571 572 buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); 573 buffer_put_int(&m, packet_get_seqnr(MODE_IN)); 574 575 debug3("%s: New keys have been sent", __func__); 576 skip: 577 /* More key context */ 578 plen = packet_get_keycontext(MODE_OUT, NULL); 579 p = xmalloc(plen+1); 580 packet_get_keycontext(MODE_OUT, p); 581 buffer_put_string(&m, p, plen); 582 xfree(p); 583 584 plen = packet_get_keycontext(MODE_IN, NULL); 585 p = xmalloc(plen+1); 586 packet_get_keycontext(MODE_IN, p); 587 buffer_put_string(&m, p, plen); 588 xfree(p); 589 590 /* Compression state */ 591 debug3("%s: Sending compression state", __func__); 592 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 593 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 594 595 /* Network I/O buffers */ 596 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 597 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 598 599 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 600 debug3("%s: Finished sending state", __func__); 601 602 buffer_free(&m); 603 } 604 605 int 606 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) 607 { 608 Buffer m; 609 char *p; 610 int success = 0; 611 612 buffer_init(&m); 613 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 614 615 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 616 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 617 618 success = buffer_get_int(&m); 619 if (success == 0) { 620 debug3("%s: pty alloc failed", __func__); 621 buffer_free(&m); 622 return (0); 623 } 624 p = buffer_get_string(&m, NULL); 625 buffer_free(&m); 626 627 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 628 xfree(p); 629 630 *ptyfd = mm_receive_fd(pmonitor->m_recvfd); 631 *ttyfd = mm_receive_fd(pmonitor->m_recvfd); 632 633 /* Success */ 634 return (1); 635 } 636 637 void 638 mm_session_pty_cleanup2(void *session) 639 { 640 Session *s = session; 641 Buffer m; 642 643 if (s->ttyfd == -1) 644 return; 645 buffer_init(&m); 646 buffer_put_cstring(&m, s->tty); 647 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 648 buffer_free(&m); 649 650 /* closed dup'ed master */ 651 if (close(s->ptymaster) < 0) 652 error("close(s->ptymaster): %s", strerror(errno)); 653 654 /* unlink pty from session */ 655 s->ttyfd = -1; 656 } 657 658 #ifdef USE_PAM 659 void 660 mm_start_pam(char *user) 661 { 662 Buffer m; 663 664 debug3("%s entering", __func__); 665 666 buffer_init(&m); 667 buffer_put_cstring(&m, user); 668 669 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 670 671 buffer_free(&m); 672 } 673 674 void * 675 mm_pam_init_ctx(Authctxt *authctxt) 676 { 677 Buffer m; 678 int success; 679 680 debug3("%s", __func__); 681 buffer_init(&m); 682 buffer_put_cstring(&m, authctxt->user); 683 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 684 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 685 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 686 success = buffer_get_int(&m); 687 if (success == 0) { 688 debug3("%s: pam_init_ctx failed", __func__); 689 buffer_free(&m); 690 return (NULL); 691 } 692 buffer_free(&m); 693 return (authctxt); 694 } 695 696 int 697 mm_pam_query(void *ctx, char **name, char **info, 698 u_int *num, char ***prompts, u_int **echo_on) 699 { 700 Buffer m; 701 int i, ret; 702 703 debug3("%s", __func__); 704 buffer_init(&m); 705 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 706 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 707 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 708 ret = buffer_get_int(&m); 709 debug3("%s: pam_query returned %d", __func__, ret); 710 *name = buffer_get_string(&m, NULL); 711 *info = buffer_get_string(&m, NULL); 712 *num = buffer_get_int(&m); 713 *prompts = xmalloc((*num + 1) * sizeof(char *)); 714 *echo_on = xmalloc((*num + 1) * sizeof(u_int)); 715 for (i = 0; i < *num; ++i) { 716 (*prompts)[i] = buffer_get_string(&m, NULL); 717 (*echo_on)[i] = buffer_get_int(&m); 718 } 719 buffer_free(&m); 720 return (ret); 721 } 722 723 int 724 mm_pam_respond(void *ctx, u_int num, char **resp) 725 { 726 Buffer m; 727 int i, ret; 728 729 debug3("%s", __func__); 730 buffer_init(&m); 731 buffer_put_int(&m, num); 732 for (i = 0; i < num; ++i) 733 buffer_put_cstring(&m, resp[i]); 734 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 735 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 736 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 737 ret = buffer_get_int(&m); 738 debug3("%s: pam_respond returned %d", __func__, ret); 739 buffer_free(&m); 740 return (ret); 741 } 742 743 void 744 mm_pam_free_ctx(void *ctxtp) 745 { 746 Buffer m; 747 748 debug3("%s", __func__); 749 buffer_init(&m); 750 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 751 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 752 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 753 buffer_free(&m); 754 } 755 #endif /* USE_PAM */ 756 757 /* Request process termination */ 758 759 void 760 mm_terminate(void) 761 { 762 Buffer m; 763 764 buffer_init(&m); 765 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 766 buffer_free(&m); 767 } 768 769 int 770 mm_ssh1_session_key(BIGNUM *num) 771 { 772 int rsafail; 773 Buffer m; 774 775 buffer_init(&m); 776 buffer_put_bignum2(&m, num); 777 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 778 779 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 780 781 rsafail = buffer_get_int(&m); 782 buffer_get_bignum2(&m, num); 783 784 buffer_free(&m); 785 786 return (rsafail); 787 } 788 789 static void 790 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 791 char ***prompts, u_int **echo_on) 792 { 793 *name = xstrdup(""); 794 *infotxt = xstrdup(""); 795 *numprompts = 1; 796 *prompts = xmalloc(*numprompts * sizeof(char *)); 797 *echo_on = xmalloc(*numprompts * sizeof(u_int)); 798 (*echo_on)[0] = 0; 799 } 800 801 int 802 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 803 u_int *numprompts, char ***prompts, u_int **echo_on) 804 { 805 Buffer m; 806 u_int success; 807 char *challenge; 808 809 debug3("%s: entering", __func__); 810 811 buffer_init(&m); 812 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 813 814 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 815 &m); 816 success = buffer_get_int(&m); 817 if (success == 0) { 818 debug3("%s: no challenge", __func__); 819 buffer_free(&m); 820 return (-1); 821 } 822 823 /* Get the challenge, and format the response */ 824 challenge = buffer_get_string(&m, NULL); 825 buffer_free(&m); 826 827 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 828 (*prompts)[0] = challenge; 829 830 debug3("%s: received challenge: %s", __func__, challenge); 831 832 return (0); 833 } 834 835 int 836 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 837 { 838 Buffer m; 839 int authok; 840 841 debug3("%s: entering", __func__); 842 if (numresponses != 1) 843 return (-1); 844 845 buffer_init(&m); 846 buffer_put_cstring(&m, responses[0]); 847 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 848 849 mm_request_receive_expect(pmonitor->m_recvfd, 850 MONITOR_ANS_BSDAUTHRESPOND, &m); 851 852 authok = buffer_get_int(&m); 853 buffer_free(&m); 854 855 return ((authok == 0) ? -1 : 0); 856 } 857 858 #ifdef SKEY 859 int 860 mm_skey_query(void *ctx, char **name, char **infotxt, 861 u_int *numprompts, char ***prompts, u_int **echo_on) 862 { 863 Buffer m; 864 int len; 865 u_int success; 866 char *p, *challenge; 867 868 debug3("%s: entering", __func__); 869 870 buffer_init(&m); 871 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 872 873 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 874 &m); 875 success = buffer_get_int(&m); 876 if (success == 0) { 877 debug3("%s: no challenge", __func__); 878 buffer_free(&m); 879 return (-1); 880 } 881 882 /* Get the challenge, and format the response */ 883 challenge = buffer_get_string(&m, NULL); 884 buffer_free(&m); 885 886 debug3("%s: received challenge: %s", __func__, challenge); 887 888 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 889 890 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; 891 p = xmalloc(len); 892 strlcpy(p, challenge, len); 893 strlcat(p, SKEY_PROMPT, len); 894 (*prompts)[0] = p; 895 xfree(challenge); 896 897 return (0); 898 } 899 900 int 901 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 902 { 903 Buffer m; 904 int authok; 905 906 debug3("%s: entering", __func__); 907 if (numresponses != 1) 908 return (-1); 909 910 buffer_init(&m); 911 buffer_put_cstring(&m, responses[0]); 912 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 913 914 mm_request_receive_expect(pmonitor->m_recvfd, 915 MONITOR_ANS_SKEYRESPOND, &m); 916 917 authok = buffer_get_int(&m); 918 buffer_free(&m); 919 920 return ((authok == 0) ? -1 : 0); 921 } 922 #endif 923 924 void 925 mm_ssh1_session_id(u_char session_id[16]) 926 { 927 Buffer m; 928 int i; 929 930 debug3("%s entering", __func__); 931 932 buffer_init(&m); 933 for (i = 0; i < 16; i++) 934 buffer_put_char(&m, session_id[i]); 935 936 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 937 buffer_free(&m); 938 } 939 940 int 941 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 942 { 943 Buffer m; 944 Key *key; 945 u_char *blob; 946 u_int blen; 947 int allowed = 0, have_forced = 0; 948 949 debug3("%s entering", __func__); 950 951 buffer_init(&m); 952 buffer_put_bignum2(&m, client_n); 953 954 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 955 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 956 957 allowed = buffer_get_int(&m); 958 959 /* fake forced command */ 960 auth_clear_options(); 961 have_forced = buffer_get_int(&m); 962 forced_command = have_forced ? xstrdup("true") : NULL; 963 964 if (allowed && rkey != NULL) { 965 blob = buffer_get_string(&m, &blen); 966 if ((key = key_from_blob(blob, blen)) == NULL) 967 fatal("%s: key_from_blob failed", __func__); 968 *rkey = key; 969 xfree(blob); 970 } 971 mm_send_debug(&m); 972 buffer_free(&m); 973 974 return (allowed); 975 } 976 977 BIGNUM * 978 mm_auth_rsa_generate_challenge(Key *key) 979 { 980 Buffer m; 981 BIGNUM *challenge; 982 u_char *blob; 983 u_int blen; 984 985 debug3("%s entering", __func__); 986 987 if ((challenge = BN_new()) == NULL) 988 fatal("%s: BN_new failed", __func__); 989 990 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 991 if (key_to_blob(key, &blob, &blen) == 0) 992 fatal("%s: key_to_blob failed", __func__); 993 key->type = KEY_RSA1; 994 995 buffer_init(&m); 996 buffer_put_string(&m, blob, blen); 997 xfree(blob); 998 999 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 1000 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 1001 1002 buffer_get_bignum2(&m, challenge); 1003 buffer_free(&m); 1004 1005 return (challenge); 1006 } 1007 1008 int 1009 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 1010 { 1011 Buffer m; 1012 u_char *blob; 1013 u_int blen; 1014 int success = 0; 1015 1016 debug3("%s entering", __func__); 1017 1018 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1019 if (key_to_blob(key, &blob, &blen) == 0) 1020 fatal("%s: key_to_blob failed", __func__); 1021 key->type = KEY_RSA1; 1022 1023 buffer_init(&m); 1024 buffer_put_string(&m, blob, blen); 1025 buffer_put_string(&m, response, 16); 1026 xfree(blob); 1027 1028 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 1029 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 1030 1031 success = buffer_get_int(&m); 1032 buffer_free(&m); 1033 1034 return (success); 1035 } 1036 1037 #ifdef KRB4 1038 int 1039 mm_auth_krb4(Authctxt *authctxt, void *_auth, char **client, void *_reply) 1040 { 1041 KTEXT auth, reply; 1042 Buffer m; 1043 u_int rlen; 1044 int success = 0; 1045 char *p; 1046 1047 debug3("%s entering", __func__); 1048 auth = _auth; 1049 reply = _reply; 1050 1051 buffer_init(&m); 1052 buffer_put_string(&m, auth->dat, auth->length); 1053 1054 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB4, &m); 1055 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB4, &m); 1056 1057 success = buffer_get_int(&m); 1058 if (success) { 1059 *client = buffer_get_string(&m, NULL); 1060 p = buffer_get_string(&m, &rlen); 1061 if (rlen >= MAX_KTXT_LEN) 1062 fatal("%s: reply from monitor too large", __func__); 1063 reply->length = rlen; 1064 memcpy(reply->dat, p, rlen); 1065 memset(p, 0, rlen); 1066 xfree(p); 1067 } 1068 buffer_free(&m); 1069 return (success); 1070 } 1071 #endif 1072 1073 #ifdef KRB5 1074 int 1075 mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp) 1076 { 1077 krb5_data *tkt, *reply; 1078 Buffer m; 1079 int success; 1080 1081 debug3("%s entering", __func__); 1082 tkt = (krb5_data *) argp; 1083 reply = (krb5_data *) resp; 1084 1085 buffer_init(&m); 1086 buffer_put_string(&m, tkt->data, tkt->length); 1087 1088 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m); 1089 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m); 1090 1091 success = buffer_get_int(&m); 1092 if (success) { 1093 u_int len; 1094 1095 *userp = buffer_get_string(&m, NULL); 1096 reply->data = buffer_get_string(&m, &len); 1097 reply->length = len; 1098 } else { 1099 memset(reply, 0, sizeof(*reply)); 1100 *userp = NULL; 1101 } 1102 1103 buffer_free(&m); 1104 return (success); 1105 } 1106 #endif 1107