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 1.19 2002/09/26 11:38:43 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 "buffer.h" 39 #include "bufaux.h" 40 #include "packet.h" 41 #include "mac.h" 42 #include "log.h" 43 #include "zlib.h" 44 #include "monitor.h" 45 #include "monitor_wrap.h" 46 #include "xmalloc.h" 47 #include "atomicio.h" 48 #include "monitor_fdpass.h" 49 #include "getput.h" 50 51 #include "auth.h" 52 #include "channels.h" 53 #include "session.h" 54 55 /* Imports */ 56 extern int compat20; 57 extern Newkeys *newkeys[]; 58 extern z_stream incoming_stream; 59 extern z_stream outgoing_stream; 60 extern struct monitor *pmonitor; 61 extern Buffer input, output; 62 63 void 64 mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) 65 { 66 u_int mlen = buffer_len(m); 67 u_char buf[5]; 68 69 debug3("%s entering: type %d", __func__, type); 70 71 PUT_32BIT(buf, mlen + 1); 72 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 73 if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf)) 74 fatal("%s: write", __func__); 75 if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen) 76 fatal("%s: write", __func__); 77 } 78 79 void 80 mm_request_receive(int socket, Buffer *m) 81 { 82 u_char buf[4]; 83 u_int msg_len; 84 ssize_t res; 85 86 debug3("%s entering", __func__); 87 88 res = atomicio(read, socket, buf, sizeof(buf)); 89 if (res != sizeof(buf)) { 90 if (res == 0) 91 fatal_cleanup(); 92 fatal("%s: read: %ld", __func__, (long)res); 93 } 94 msg_len = GET_32BIT(buf); 95 if (msg_len > 256 * 1024) 96 fatal("%s: read: bad msg_len %d", __func__, msg_len); 97 buffer_clear(m); 98 buffer_append_space(m, msg_len); 99 res = atomicio(read, socket, buffer_ptr(m), msg_len); 100 if (res != msg_len) 101 fatal("%s: read: %ld != msg_len", __func__, (long)res); 102 } 103 104 void 105 mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m) 106 { 107 u_char rtype; 108 109 debug3("%s entering: type %d", __func__, type); 110 111 mm_request_receive(socket, m); 112 rtype = buffer_get_char(m); 113 if (rtype != type) 114 fatal("%s: read: rtype %d != type %d", __func__, 115 rtype, type); 116 } 117 118 DH * 119 mm_choose_dh(int min, int nbits, int max) 120 { 121 BIGNUM *p, *g; 122 int success = 0; 123 Buffer m; 124 125 buffer_init(&m); 126 buffer_put_int(&m, min); 127 buffer_put_int(&m, nbits); 128 buffer_put_int(&m, max); 129 130 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 131 132 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 133 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 134 135 success = buffer_get_char(&m); 136 if (success == 0) 137 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 138 139 if ((p = BN_new()) == NULL) 140 fatal("%s: BN_new failed", __func__); 141 if ((g = BN_new()) == NULL) 142 fatal("%s: BN_new failed", __func__); 143 buffer_get_bignum2(&m, p); 144 buffer_get_bignum2(&m, g); 145 146 debug3("%s: remaining %d", __func__, buffer_len(&m)); 147 buffer_free(&m); 148 149 return (dh_new_group(g, p)); 150 } 151 152 int 153 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) 154 { 155 Kex *kex = *pmonitor->m_pkex; 156 Buffer m; 157 158 debug3("%s entering", __func__); 159 160 buffer_init(&m); 161 buffer_put_int(&m, kex->host_key_index(key)); 162 buffer_put_string(&m, data, datalen); 163 164 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 165 166 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 167 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 168 *sigp = buffer_get_string(&m, lenp); 169 buffer_free(&m); 170 171 return (0); 172 } 173 174 struct passwd * 175 mm_getpwnamallow(const char *login) 176 { 177 Buffer m; 178 struct passwd *pw; 179 u_int pwlen; 180 181 debug3("%s entering", __func__); 182 183 buffer_init(&m); 184 buffer_put_cstring(&m, login); 185 186 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 187 188 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 189 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 190 191 if (buffer_get_char(&m) == 0) { 192 buffer_free(&m); 193 return (NULL); 194 } 195 pw = buffer_get_string(&m, &pwlen); 196 if (pwlen != sizeof(struct passwd)) 197 fatal("%s: struct passwd size mismatch", __func__); 198 pw->pw_name = buffer_get_string(&m, NULL); 199 pw->pw_passwd = buffer_get_string(&m, NULL); 200 pw->pw_gecos = buffer_get_string(&m, NULL); 201 #ifdef HAVE_PW_CLASS_IN_PASSWD 202 pw->pw_class = buffer_get_string(&m, NULL); 203 #endif 204 pw->pw_dir = buffer_get_string(&m, NULL); 205 pw->pw_shell = buffer_get_string(&m, NULL); 206 buffer_free(&m); 207 208 return (pw); 209 } 210 211 char *mm_auth2_read_banner(void) 212 { 213 Buffer m; 214 char *banner; 215 216 debug3("%s entering", __func__); 217 218 buffer_init(&m); 219 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 220 buffer_clear(&m); 221 222 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m); 223 banner = buffer_get_string(&m, NULL); 224 buffer_free(&m); 225 226 return (banner); 227 } 228 229 /* Inform the privileged process about service and style */ 230 231 void 232 mm_inform_authserv(char *service, char *style) 233 { 234 Buffer m; 235 236 debug3("%s entering", __func__); 237 238 buffer_init(&m); 239 buffer_put_cstring(&m, service); 240 buffer_put_cstring(&m, style ? style : ""); 241 242 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 243 244 buffer_free(&m); 245 } 246 247 /* Do the password authentication */ 248 int 249 mm_auth_password(Authctxt *authctxt, char *password) 250 { 251 Buffer m; 252 int authenticated = 0; 253 254 debug3("%s entering", __func__); 255 256 buffer_init(&m); 257 buffer_put_cstring(&m, password); 258 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 259 260 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 261 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 262 263 authenticated = buffer_get_int(&m); 264 265 buffer_free(&m); 266 267 debug3("%s: user %sauthenticated", 268 __func__, authenticated ? "" : "not "); 269 return (authenticated); 270 } 271 272 int 273 mm_user_key_allowed(struct passwd *pw, Key *key) 274 { 275 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); 276 } 277 278 int 279 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, 280 Key *key) 281 { 282 return (mm_key_allowed(MM_HOSTKEY, user, host, key)); 283 } 284 285 int 286 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, 287 char *host, Key *key) 288 { 289 int ret; 290 291 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 292 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); 293 key->type = KEY_RSA1; 294 return (ret); 295 } 296 297 static void 298 mm_send_debug(Buffer *m) 299 { 300 char *msg; 301 302 while (buffer_len(m)) { 303 msg = buffer_get_string(m, NULL); 304 debug3("%s: Sending debug: %s", __func__, msg); 305 packet_send_debug("%s", msg); 306 xfree(msg); 307 } 308 } 309 310 int 311 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) 312 { 313 Buffer m; 314 u_char *blob; 315 u_int len; 316 int allowed = 0; 317 318 debug3("%s entering", __func__); 319 320 /* Convert the key to a blob and the pass it over */ 321 if (!key_to_blob(key, &blob, &len)) 322 return (0); 323 324 buffer_init(&m); 325 buffer_put_int(&m, type); 326 buffer_put_cstring(&m, user ? user : ""); 327 buffer_put_cstring(&m, host ? host : ""); 328 buffer_put_string(&m, blob, len); 329 xfree(blob); 330 331 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 332 333 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 334 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 335 336 allowed = buffer_get_int(&m); 337 338 /* Send potential debug messages */ 339 mm_send_debug(&m); 340 341 buffer_free(&m); 342 343 return (allowed); 344 } 345 346 /* 347 * This key verify needs to send the key type along, because the 348 * privileged parent makes the decision if the key is allowed 349 * for authentication. 350 */ 351 352 int 353 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 354 { 355 Buffer m; 356 u_char *blob; 357 u_int len; 358 int verified = 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_string(&m, blob, len); 368 buffer_put_string(&m, sig, siglen); 369 buffer_put_string(&m, data, datalen); 370 xfree(blob); 371 372 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 373 374 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 375 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 376 377 verified = buffer_get_int(&m); 378 379 buffer_free(&m); 380 381 return (verified); 382 } 383 384 /* Export key state after authentication */ 385 Newkeys * 386 mm_newkeys_from_blob(u_char *blob, int blen) 387 { 388 Buffer b; 389 u_int len; 390 Newkeys *newkey = NULL; 391 Enc *enc; 392 Mac *mac; 393 Comp *comp; 394 395 debug3("%s: %p(%d)", __func__, blob, blen); 396 #ifdef DEBUG_PK 397 dump_base64(stderr, blob, blen); 398 #endif 399 buffer_init(&b); 400 buffer_append(&b, blob, blen); 401 402 newkey = xmalloc(sizeof(*newkey)); 403 enc = &newkey->enc; 404 mac = &newkey->mac; 405 comp = &newkey->comp; 406 407 /* Enc structure */ 408 enc->name = buffer_get_string(&b, NULL); 409 buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); 410 enc->enabled = buffer_get_int(&b); 411 enc->block_size = buffer_get_int(&b); 412 enc->key = buffer_get_string(&b, &enc->key_len); 413 enc->iv = buffer_get_string(&b, &len); 414 if (len != enc->block_size) 415 fatal("%s: bad ivlen: expected %u != %u", __func__, 416 enc->block_size, len); 417 418 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) 419 fatal("%s: bad cipher name %s or pointer %p", __func__, 420 enc->name, enc->cipher); 421 422 /* Mac structure */ 423 mac->name = buffer_get_string(&b, NULL); 424 if (mac->name == NULL || mac_init(mac, mac->name) == -1) 425 fatal("%s: can not init mac %s", __func__, mac->name); 426 mac->enabled = buffer_get_int(&b); 427 mac->key = buffer_get_string(&b, &len); 428 if (len > mac->key_len) 429 fatal("%s: bad mac key length: %u > %d", __func__, len, 430 mac->key_len); 431 mac->key_len = len; 432 433 /* Comp structure */ 434 comp->type = buffer_get_int(&b); 435 comp->enabled = buffer_get_int(&b); 436 comp->name = buffer_get_string(&b, NULL); 437 438 len = buffer_len(&b); 439 if (len != 0) 440 error("newkeys_from_blob: remaining bytes in blob %u", len); 441 buffer_free(&b); 442 return (newkey); 443 } 444 445 int 446 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) 447 { 448 Buffer b; 449 int len; 450 Enc *enc; 451 Mac *mac; 452 Comp *comp; 453 Newkeys *newkey = newkeys[mode]; 454 455 debug3("%s: converting %p", __func__, newkey); 456 457 if (newkey == NULL) { 458 error("%s: newkey == NULL", __func__); 459 return 0; 460 } 461 enc = &newkey->enc; 462 mac = &newkey->mac; 463 comp = &newkey->comp; 464 465 buffer_init(&b); 466 /* Enc structure */ 467 buffer_put_cstring(&b, enc->name); 468 /* The cipher struct is constant and shared, you export pointer */ 469 buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); 470 buffer_put_int(&b, enc->enabled); 471 buffer_put_int(&b, enc->block_size); 472 buffer_put_string(&b, enc->key, enc->key_len); 473 packet_get_keyiv(mode, enc->iv, enc->block_size); 474 buffer_put_string(&b, enc->iv, enc->block_size); 475 476 /* Mac structure */ 477 buffer_put_cstring(&b, mac->name); 478 buffer_put_int(&b, mac->enabled); 479 buffer_put_string(&b, mac->key, mac->key_len); 480 481 /* Comp structure */ 482 buffer_put_int(&b, comp->type); 483 buffer_put_int(&b, comp->enabled); 484 buffer_put_cstring(&b, comp->name); 485 486 len = buffer_len(&b); 487 if (lenp != NULL) 488 *lenp = len; 489 if (blobp != NULL) { 490 *blobp = xmalloc(len); 491 memcpy(*blobp, buffer_ptr(&b), len); 492 } 493 memset(buffer_ptr(&b), 0, len); 494 buffer_free(&b); 495 return len; 496 } 497 498 static void 499 mm_send_kex(Buffer *m, Kex *kex) 500 { 501 buffer_put_string(m, kex->session_id, kex->session_id_len); 502 buffer_put_int(m, kex->we_need); 503 buffer_put_int(m, kex->hostkey_type); 504 buffer_put_int(m, kex->kex_type); 505 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); 506 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); 507 buffer_put_int(m, kex->flags); 508 buffer_put_cstring(m, kex->client_version_string); 509 buffer_put_cstring(m, kex->server_version_string); 510 } 511 512 void 513 mm_send_keystate(struct monitor *pmonitor) 514 { 515 Buffer m; 516 u_char *blob, *p; 517 u_int bloblen, plen; 518 519 buffer_init(&m); 520 521 if (!compat20) { 522 u_char iv[24]; 523 u_char *key; 524 u_int ivlen, keylen; 525 526 buffer_put_int(&m, packet_get_protocol_flags()); 527 528 buffer_put_int(&m, packet_get_ssh1_cipher()); 529 530 debug3("%s: Sending ssh1 KEY+IV", __func__); 531 keylen = packet_get_encryption_key(NULL); 532 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ 533 keylen = packet_get_encryption_key(key); 534 buffer_put_string(&m, key, keylen); 535 memset(key, 0, keylen); 536 xfree(key); 537 538 ivlen = packet_get_keyiv_len(MODE_OUT); 539 packet_get_keyiv(MODE_OUT, iv, ivlen); 540 buffer_put_string(&m, iv, ivlen); 541 ivlen = packet_get_keyiv_len(MODE_OUT); 542 packet_get_keyiv(MODE_IN, iv, ivlen); 543 buffer_put_string(&m, iv, ivlen); 544 goto skip; 545 } else { 546 /* Kex for rekeying */ 547 mm_send_kex(&m, *pmonitor->m_pkex); 548 } 549 550 debug3("%s: Sending new keys: %p %p", 551 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); 552 553 /* Keys from Kex */ 554 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) 555 fatal("%s: conversion of newkeys failed", __func__); 556 557 buffer_put_string(&m, blob, bloblen); 558 xfree(blob); 559 560 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) 561 fatal("%s: conversion of newkeys failed", __func__); 562 563 buffer_put_string(&m, blob, bloblen); 564 xfree(blob); 565 566 buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); 567 buffer_put_int(&m, packet_get_seqnr(MODE_IN)); 568 569 debug3("%s: New keys have been sent", __func__); 570 skip: 571 /* More key context */ 572 plen = packet_get_keycontext(MODE_OUT, NULL); 573 p = xmalloc(plen+1); 574 packet_get_keycontext(MODE_OUT, p); 575 buffer_put_string(&m, p, plen); 576 xfree(p); 577 578 plen = packet_get_keycontext(MODE_IN, NULL); 579 p = xmalloc(plen+1); 580 packet_get_keycontext(MODE_IN, p); 581 buffer_put_string(&m, p, plen); 582 xfree(p); 583 584 /* Compression state */ 585 debug3("%s: Sending compression state", __func__); 586 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); 587 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); 588 589 /* Network I/O buffers */ 590 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); 591 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); 592 593 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); 594 debug3("%s: Finished sending state", __func__); 595 596 buffer_free(&m); 597 } 598 599 int 600 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) 601 { 602 Buffer m; 603 char *p; 604 int success = 0; 605 606 buffer_init(&m); 607 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 608 609 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 610 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 611 612 success = buffer_get_int(&m); 613 if (success == 0) { 614 debug3("%s: pty alloc failed", __func__); 615 buffer_free(&m); 616 return (0); 617 } 618 p = buffer_get_string(&m, NULL); 619 buffer_free(&m); 620 621 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 622 xfree(p); 623 624 *ptyfd = mm_receive_fd(pmonitor->m_recvfd); 625 *ttyfd = mm_receive_fd(pmonitor->m_recvfd); 626 627 /* Success */ 628 return (1); 629 } 630 631 void 632 mm_session_pty_cleanup2(void *session) 633 { 634 Session *s = session; 635 Buffer m; 636 637 if (s->ttyfd == -1) 638 return; 639 buffer_init(&m); 640 buffer_put_cstring(&m, s->tty); 641 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 642 buffer_free(&m); 643 644 /* closed dup'ed master */ 645 if (close(s->ptymaster) < 0) 646 error("close(s->ptymaster): %s", strerror(errno)); 647 648 /* unlink pty from session */ 649 s->ttyfd = -1; 650 } 651 652 #ifdef USE_PAM 653 void 654 mm_start_pam(char *user) 655 { 656 Buffer m; 657 658 debug3("%s entering", __func__); 659 660 buffer_init(&m); 661 buffer_put_cstring(&m, user); 662 663 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 664 665 buffer_free(&m); 666 } 667 668 void * 669 mm_pam_init_ctx(Authctxt *authctxt) 670 { 671 Buffer m; 672 int success; 673 674 debug3("%s", __func__); 675 buffer_init(&m); 676 buffer_put_cstring(&m, authctxt->user); 677 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 678 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 679 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 680 success = buffer_get_int(&m); 681 if (success == 0) { 682 debug3("%s: pam_init_ctx failed", __func__); 683 buffer_free(&m); 684 return (NULL); 685 } 686 buffer_free(&m); 687 return (authctxt); 688 } 689 690 int 691 mm_pam_query(void *ctx, char **name, char **info, 692 u_int *num, char ***prompts, u_int **echo_on) 693 { 694 Buffer m; 695 int i, ret; 696 697 debug3("%s", __func__); 698 buffer_init(&m); 699 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 700 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 701 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 702 ret = buffer_get_int(&m); 703 debug3("%s: pam_query returned %d", __func__, ret); 704 *name = buffer_get_string(&m, NULL); 705 *info = buffer_get_string(&m, NULL); 706 *num = buffer_get_int(&m); 707 *prompts = xmalloc((*num + 1) * sizeof(char *)); 708 *echo_on = xmalloc((*num + 1) * sizeof(u_int)); 709 for (i = 0; i < *num; ++i) { 710 (*prompts)[i] = buffer_get_string(&m, NULL); 711 (*echo_on)[i] = buffer_get_int(&m); 712 } 713 buffer_free(&m); 714 return (ret); 715 } 716 717 int 718 mm_pam_respond(void *ctx, u_int num, char **resp) 719 { 720 Buffer m; 721 int i, ret; 722 723 debug3("%s", __func__); 724 buffer_init(&m); 725 buffer_put_int(&m, num); 726 for (i = 0; i < num; ++i) 727 buffer_put_cstring(&m, resp[i]); 728 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 729 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 730 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 731 ret = buffer_get_int(&m); 732 debug3("%s: pam_respond returned %d", __func__, ret); 733 buffer_free(&m); 734 return (ret); 735 } 736 737 void 738 mm_pam_free_ctx(void *ctxtp) 739 { 740 Buffer m; 741 742 debug3("%s", __func__); 743 buffer_init(&m); 744 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 745 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 746 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 747 buffer_free(&m); 748 } 749 #endif /* USE_PAM */ 750 751 /* Request process termination */ 752 753 void 754 mm_terminate(void) 755 { 756 Buffer m; 757 758 buffer_init(&m); 759 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 760 buffer_free(&m); 761 } 762 763 int 764 mm_ssh1_session_key(BIGNUM *num) 765 { 766 int rsafail; 767 Buffer m; 768 769 buffer_init(&m); 770 buffer_put_bignum2(&m, num); 771 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 772 773 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 774 775 rsafail = buffer_get_int(&m); 776 buffer_get_bignum2(&m, num); 777 778 buffer_free(&m); 779 780 return (rsafail); 781 } 782 783 static void 784 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 785 char ***prompts, u_int **echo_on) 786 { 787 *name = xstrdup(""); 788 *infotxt = xstrdup(""); 789 *numprompts = 1; 790 *prompts = xmalloc(*numprompts * sizeof(char *)); 791 *echo_on = xmalloc(*numprompts * sizeof(u_int)); 792 (*echo_on)[0] = 0; 793 } 794 795 int 796 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 797 u_int *numprompts, char ***prompts, u_int **echo_on) 798 { 799 Buffer m; 800 int res; 801 char *challenge; 802 803 debug3("%s: entering", __func__); 804 805 buffer_init(&m); 806 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 807 808 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 809 &m); 810 res = buffer_get_int(&m); 811 if (res == -1) { 812 debug3("%s: no challenge", __func__); 813 buffer_free(&m); 814 return (-1); 815 } 816 817 /* Get the challenge, and format the response */ 818 challenge = buffer_get_string(&m, NULL); 819 buffer_free(&m); 820 821 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 822 (*prompts)[0] = challenge; 823 824 debug3("%s: received challenge: %s", __func__, challenge); 825 826 return (0); 827 } 828 829 int 830 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 831 { 832 Buffer m; 833 int authok; 834 835 debug3("%s: entering", __func__); 836 if (numresponses != 1) 837 return (-1); 838 839 buffer_init(&m); 840 buffer_put_cstring(&m, responses[0]); 841 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 842 843 mm_request_receive_expect(pmonitor->m_recvfd, 844 MONITOR_ANS_BSDAUTHRESPOND, &m); 845 846 authok = buffer_get_int(&m); 847 buffer_free(&m); 848 849 return ((authok == 0) ? -1 : 0); 850 } 851 852 #ifdef SKEY 853 int 854 mm_skey_query(void *ctx, char **name, char **infotxt, 855 u_int *numprompts, char ***prompts, u_int **echo_on) 856 { 857 Buffer m; 858 int len, res; 859 char *p, *challenge; 860 861 debug3("%s: entering", __func__); 862 863 buffer_init(&m); 864 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 865 866 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 867 &m); 868 res = buffer_get_int(&m); 869 if (res == -1) { 870 debug3("%s: no challenge", __func__); 871 buffer_free(&m); 872 return (-1); 873 } 874 875 /* Get the challenge, and format the response */ 876 challenge = buffer_get_string(&m, NULL); 877 buffer_free(&m); 878 879 debug3("%s: received challenge: %s", __func__, challenge); 880 881 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 882 883 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1; 884 p = xmalloc(len); 885 strlcpy(p, challenge, len); 886 strlcat(p, SKEY_PROMPT, len); 887 (*prompts)[0] = p; 888 xfree(challenge); 889 890 return (0); 891 } 892 893 int 894 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 895 { 896 Buffer m; 897 int authok; 898 899 debug3("%s: entering", __func__); 900 if (numresponses != 1) 901 return (-1); 902 903 buffer_init(&m); 904 buffer_put_cstring(&m, responses[0]); 905 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 906 907 mm_request_receive_expect(pmonitor->m_recvfd, 908 MONITOR_ANS_SKEYRESPOND, &m); 909 910 authok = buffer_get_int(&m); 911 buffer_free(&m); 912 913 return ((authok == 0) ? -1 : 0); 914 } 915 #endif 916 917 void 918 mm_ssh1_session_id(u_char session_id[16]) 919 { 920 Buffer m; 921 int i; 922 923 debug3("%s entering", __func__); 924 925 buffer_init(&m); 926 for (i = 0; i < 16; i++) 927 buffer_put_char(&m, session_id[i]); 928 929 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 930 buffer_free(&m); 931 } 932 933 int 934 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 935 { 936 Buffer m; 937 Key *key; 938 u_char *blob; 939 u_int blen; 940 int allowed = 0; 941 942 debug3("%s entering", __func__); 943 944 buffer_init(&m); 945 buffer_put_bignum2(&m, client_n); 946 947 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 948 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 949 950 allowed = buffer_get_int(&m); 951 952 if (allowed && rkey != NULL) { 953 blob = buffer_get_string(&m, &blen); 954 if ((key = key_from_blob(blob, blen)) == NULL) 955 fatal("%s: key_from_blob failed", __func__); 956 *rkey = key; 957 xfree(blob); 958 } 959 mm_send_debug(&m); 960 buffer_free(&m); 961 962 return (allowed); 963 } 964 965 BIGNUM * 966 mm_auth_rsa_generate_challenge(Key *key) 967 { 968 Buffer m; 969 BIGNUM *challenge; 970 u_char *blob; 971 u_int blen; 972 973 debug3("%s entering", __func__); 974 975 if ((challenge = BN_new()) == NULL) 976 fatal("%s: BN_new failed", __func__); 977 978 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 979 if (key_to_blob(key, &blob, &blen) == 0) 980 fatal("%s: key_to_blob failed", __func__); 981 key->type = KEY_RSA1; 982 983 buffer_init(&m); 984 buffer_put_string(&m, blob, blen); 985 xfree(blob); 986 987 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 988 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 989 990 buffer_get_bignum2(&m, challenge); 991 buffer_free(&m); 992 993 return (challenge); 994 } 995 996 int 997 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 998 { 999 Buffer m; 1000 u_char *blob; 1001 u_int blen; 1002 int success = 0; 1003 1004 debug3("%s entering", __func__); 1005 1006 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 1007 if (key_to_blob(key, &blob, &blen) == 0) 1008 fatal("%s: key_to_blob failed", __func__); 1009 key->type = KEY_RSA1; 1010 1011 buffer_init(&m); 1012 buffer_put_string(&m, blob, blen); 1013 buffer_put_string(&m, response, 16); 1014 xfree(blob); 1015 1016 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 1017 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 1018 1019 success = buffer_get_int(&m); 1020 buffer_free(&m); 1021 1022 return (success); 1023 } 1024 1025 #ifdef KRB4 1026 int 1027 mm_auth_krb4(Authctxt *authctxt, void *_auth, char **client, void *_reply) 1028 { 1029 KTEXT auth, reply; 1030 Buffer m; 1031 u_int rlen; 1032 int success = 0; 1033 char *p; 1034 1035 debug3("%s entering", __func__); 1036 auth = _auth; 1037 reply = _reply; 1038 1039 buffer_init(&m); 1040 buffer_put_string(&m, auth->dat, auth->length); 1041 1042 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB4, &m); 1043 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB4, &m); 1044 1045 success = buffer_get_int(&m); 1046 if (success) { 1047 *client = buffer_get_string(&m, NULL); 1048 p = buffer_get_string(&m, &rlen); 1049 if (rlen >= MAX_KTXT_LEN) 1050 fatal("%s: reply from monitor too large", __func__); 1051 reply->length = rlen; 1052 memcpy(reply->dat, p, rlen); 1053 memset(p, 0, rlen); 1054 xfree(p); 1055 } 1056 buffer_free(&m); 1057 return (success); 1058 } 1059 #endif 1060 1061 #ifdef KRB5 1062 int 1063 mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp) 1064 { 1065 krb5_data *tkt, *reply; 1066 Buffer m; 1067 int success; 1068 1069 debug3("%s entering", __func__); 1070 tkt = (krb5_data *) argp; 1071 reply = (krb5_data *) resp; 1072 1073 buffer_init(&m); 1074 buffer_put_string(&m, tkt->data, tkt->length); 1075 1076 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m); 1077 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m); 1078 1079 success = buffer_get_int(&m); 1080 if (success) { 1081 u_int len; 1082 1083 *userp = buffer_get_string(&m, NULL); 1084 reply->data = buffer_get_string(&m, &len); 1085 reply->length = len; 1086 } else { 1087 memset(reply, 0, sizeof(*reply)); 1088 *userp = NULL; 1089 } 1090 1091 buffer_free(&m); 1092 return (success); 1093 } 1094 #endif 1095