1 /* $OpenBSD: monitor_wrap.c,v 1.88 2016/03/07 19:02:43 djm Exp $ */ 2 /* 3 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 4 * Copyright 2002 Markus Friedl <markus@openbsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <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 #ifdef WITH_OPENSSL 40 #include <openssl/bn.h> 41 #include <openssl/dh.h> 42 #endif 43 44 #include "xmalloc.h" 45 #include "ssh.h" 46 #ifdef WITH_OPENSSL 47 #include "dh.h" 48 #endif 49 #include "buffer.h" 50 #include "key.h" 51 #include "cipher.h" 52 #include "kex.h" 53 #include "hostfile.h" 54 #include "auth.h" 55 #include "auth-options.h" 56 #include "packet.h" 57 #include "mac.h" 58 #include "log.h" 59 #include <zlib.h> 60 #include "monitor.h" 61 #ifdef GSSAPI 62 #include "ssh-gss.h" 63 #endif 64 #include "monitor_wrap.h" 65 #include "atomicio.h" 66 #include "monitor_fdpass.h" 67 #include "misc.h" 68 #include "uuencode.h" 69 70 #include "channels.h" 71 #include "session.h" 72 #include "servconf.h" 73 74 #include "ssherr.h" 75 76 /* Imports */ 77 extern int compat20; 78 extern z_stream incoming_stream; 79 extern z_stream outgoing_stream; 80 extern struct monitor *pmonitor; 81 extern Buffer loginmsg; 82 extern ServerOptions options; 83 84 void 85 mm_log_handler(LogLevel level, const char *msg, void *ctx) 86 { 87 Buffer log_msg; 88 struct monitor *mon = (struct monitor *)ctx; 89 90 if (mon->m_log_sendfd == -1) 91 fatal("%s: no log channel", __func__); 92 93 buffer_init(&log_msg); 94 /* 95 * Placeholder for packet length. Will be filled in with the actual 96 * packet length once the packet has been constucted. This saves 97 * fragile math. 98 */ 99 buffer_put_int(&log_msg, 0); 100 101 buffer_put_int(&log_msg, level); 102 buffer_put_cstring(&log_msg, msg); 103 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); 104 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), 105 buffer_len(&log_msg)) != buffer_len(&log_msg)) 106 fatal("%s: write: %s", __func__, strerror(errno)); 107 buffer_free(&log_msg); 108 } 109 110 int 111 mm_is_monitor(void) 112 { 113 /* 114 * m_pid is only set in the privileged part, and 115 * points to the unprivileged child. 116 */ 117 return (pmonitor && pmonitor->m_pid > 0); 118 } 119 120 void 121 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 122 { 123 u_int mlen = buffer_len(m); 124 u_char buf[5]; 125 126 debug3("%s entering: type %d", __func__, type); 127 128 put_u32(buf, mlen + 1); 129 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 130 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 131 fatal("%s: write: %s", __func__, strerror(errno)); 132 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 133 fatal("%s: write: %s", __func__, strerror(errno)); 134 } 135 136 void 137 mm_request_receive(int sock, Buffer *m) 138 { 139 u_char buf[4]; 140 u_int msg_len; 141 142 debug3("%s entering", __func__); 143 144 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 145 if (errno == EPIPE) 146 cleanup_exit(255); 147 fatal("%s: read: %s", __func__, strerror(errno)); 148 } 149 msg_len = get_u32(buf); 150 if (msg_len > 256 * 1024) 151 fatal("%s: read: bad msg_len %d", __func__, msg_len); 152 buffer_clear(m); 153 buffer_append_space(m, msg_len); 154 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 155 fatal("%s: read: %s", __func__, strerror(errno)); 156 } 157 158 void 159 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 160 { 161 u_char rtype; 162 163 debug3("%s entering: type %d", __func__, type); 164 165 mm_request_receive(sock, m); 166 rtype = buffer_get_char(m); 167 if (rtype != type) 168 fatal("%s: read: rtype %d != type %d", __func__, 169 rtype, type); 170 } 171 172 #ifdef WITH_OPENSSL 173 DH * 174 mm_choose_dh(int min, int nbits, int max) 175 { 176 BIGNUM *p, *g; 177 int success = 0; 178 Buffer m; 179 180 buffer_init(&m); 181 buffer_put_int(&m, min); 182 buffer_put_int(&m, nbits); 183 buffer_put_int(&m, max); 184 185 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 186 187 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 188 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 189 190 success = buffer_get_char(&m); 191 if (success == 0) 192 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 193 194 if ((p = BN_new()) == NULL) 195 fatal("%s: BN_new failed", __func__); 196 if ((g = BN_new()) == NULL) 197 fatal("%s: BN_new failed", __func__); 198 buffer_get_bignum2(&m, p); 199 buffer_get_bignum2(&m, g); 200 201 debug3("%s: remaining %d", __func__, buffer_len(&m)); 202 buffer_free(&m); 203 204 return (dh_new_group(g, p)); 205 } 206 #endif 207 208 int 209 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, 210 const u_char *data, u_int datalen, const char *hostkey_alg) 211 { 212 struct kex *kex = *pmonitor->m_pkex; 213 Buffer m; 214 215 debug3("%s entering", __func__); 216 217 buffer_init(&m); 218 buffer_put_int(&m, kex->host_key_index(key, 0, active_state)); 219 buffer_put_string(&m, data, datalen); 220 buffer_put_cstring(&m, hostkey_alg); 221 222 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 223 224 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 225 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 226 *sigp = buffer_get_string(&m, lenp); 227 buffer_free(&m); 228 229 return (0); 230 } 231 232 struct passwd * 233 mm_getpwnamallow(const char *username) 234 { 235 Buffer m; 236 struct passwd *pw; 237 u_int len, i; 238 ServerOptions *newopts; 239 240 debug3("%s entering", __func__); 241 242 buffer_init(&m); 243 buffer_put_cstring(&m, username); 244 245 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 246 247 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 248 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 249 250 if (buffer_get_char(&m) == 0) { 251 pw = NULL; 252 goto out; 253 } 254 pw = buffer_get_string(&m, &len); 255 if (len != sizeof(struct passwd)) 256 fatal("%s: struct passwd size mismatch", __func__); 257 pw->pw_name = buffer_get_string(&m, NULL); 258 pw->pw_passwd = buffer_get_string(&m, NULL); 259 pw->pw_gecos = buffer_get_string(&m, NULL); 260 pw->pw_class = buffer_get_string(&m, NULL); 261 pw->pw_dir = buffer_get_string(&m, NULL); 262 pw->pw_shell = buffer_get_string(&m, NULL); 263 264 out: 265 /* copy options block as a Match directive may have changed some */ 266 newopts = buffer_get_string(&m, &len); 267 if (len != sizeof(*newopts)) 268 fatal("%s: option block size mismatch", __func__); 269 270 #define M_CP_STROPT(x) do { \ 271 if (newopts->x != NULL) \ 272 newopts->x = buffer_get_string(&m, NULL); \ 273 } while (0) 274 #define M_CP_STRARRAYOPT(x, nx) do { \ 275 for (i = 0; i < newopts->nx; i++) \ 276 newopts->x[i] = buffer_get_string(&m, NULL); \ 277 } while (0) 278 /* See comment in servconf.h */ 279 COPY_MATCH_STRING_OPTS(); 280 #undef M_CP_STROPT 281 #undef M_CP_STRARRAYOPT 282 283 copy_set_server_options(&options, newopts, 1); 284 free(newopts); 285 286 buffer_free(&m); 287 288 return (pw); 289 } 290 291 char * 292 mm_auth2_read_banner(void) 293 { 294 Buffer m; 295 char *banner; 296 297 debug3("%s entering", __func__); 298 299 buffer_init(&m); 300 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 301 buffer_clear(&m); 302 303 mm_request_receive_expect(pmonitor->m_recvfd, 304 MONITOR_ANS_AUTH2_READ_BANNER, &m); 305 banner = buffer_get_string(&m, NULL); 306 buffer_free(&m); 307 308 /* treat empty banner as missing banner */ 309 if (strlen(banner) == 0) { 310 free(banner); 311 banner = NULL; 312 } 313 return (banner); 314 } 315 316 /* Inform the privileged process about service and style */ 317 318 void 319 mm_inform_authserv(char *service, char *style) 320 { 321 Buffer m; 322 323 debug3("%s entering", __func__); 324 325 buffer_init(&m); 326 buffer_put_cstring(&m, service); 327 buffer_put_cstring(&m, style ? style : ""); 328 329 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 330 331 buffer_free(&m); 332 } 333 334 /* Do the password authentication */ 335 int 336 mm_auth_password(Authctxt *authctxt, char *password) 337 { 338 Buffer m; 339 int authenticated = 0; 340 341 debug3("%s entering", __func__); 342 343 buffer_init(&m); 344 buffer_put_cstring(&m, password); 345 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 346 347 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 348 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 349 350 authenticated = buffer_get_int(&m); 351 352 buffer_free(&m); 353 354 debug3("%s: user %sauthenticated", 355 __func__, authenticated ? "" : "not "); 356 return (authenticated); 357 } 358 359 int 360 mm_user_key_allowed(struct passwd *pw, Key *key, int pubkey_auth_attempt) 361 { 362 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key, 363 pubkey_auth_attempt)); 364 } 365 366 int 367 mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host, 368 Key *key) 369 { 370 return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0)); 371 } 372 373 int 374 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, const char *user, 375 const char *host, Key *key) 376 { 377 int ret; 378 379 key->type = KEY_RSA; /* XXX hack for key_to_blob */ 380 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key, 0); 381 key->type = KEY_RSA1; 382 return (ret); 383 } 384 385 int 386 mm_key_allowed(enum mm_keytype type, const char *user, const char *host, 387 Key *key, int pubkey_auth_attempt) 388 { 389 Buffer m; 390 u_char *blob; 391 u_int len; 392 int allowed = 0, have_forced = 0; 393 394 debug3("%s entering", __func__); 395 396 /* Convert the key to a blob and the pass it over */ 397 if (!key_to_blob(key, &blob, &len)) 398 return (0); 399 400 buffer_init(&m); 401 buffer_put_int(&m, type); 402 buffer_put_cstring(&m, user ? user : ""); 403 buffer_put_cstring(&m, host ? host : ""); 404 buffer_put_string(&m, blob, len); 405 buffer_put_int(&m, pubkey_auth_attempt); 406 free(blob); 407 408 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 409 410 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 411 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 412 413 allowed = buffer_get_int(&m); 414 415 /* fake forced command */ 416 auth_clear_options(); 417 have_forced = buffer_get_int(&m); 418 forced_command = have_forced ? xstrdup("true") : NULL; 419 420 buffer_free(&m); 421 422 return (allowed); 423 } 424 425 /* 426 * This key verify needs to send the key type along, because the 427 * privileged parent makes the decision if the key is allowed 428 * for authentication. 429 */ 430 431 int 432 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 433 { 434 Buffer m; 435 u_char *blob; 436 u_int len; 437 int verified = 0; 438 439 debug3("%s entering", __func__); 440 441 /* Convert the key to a blob and the pass it over */ 442 if (!key_to_blob(key, &blob, &len)) 443 return (0); 444 445 buffer_init(&m); 446 buffer_put_string(&m, blob, len); 447 buffer_put_string(&m, sig, siglen); 448 buffer_put_string(&m, data, datalen); 449 free(blob); 450 451 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 452 453 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 454 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 455 456 verified = buffer_get_int(&m); 457 458 buffer_free(&m); 459 460 return (verified); 461 } 462 463 void 464 mm_send_keystate(struct monitor *monitor) 465 { 466 struct ssh *ssh = active_state; /* XXX */ 467 struct sshbuf *m; 468 int r; 469 470 if ((m = sshbuf_new()) == NULL) 471 fatal("%s: sshbuf_new failed", __func__); 472 if ((r = ssh_packet_get_state(ssh, m)) != 0) 473 fatal("%s: get_state failed: %s", 474 __func__, ssh_err(r)); 475 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m); 476 debug3("%s: Finished sending state", __func__); 477 sshbuf_free(m); 478 } 479 480 int 481 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 482 { 483 Buffer m; 484 char *p, *msg; 485 int success = 0, tmp1 = -1, tmp2 = -1; 486 487 /* Kludge: ensure there are fds free to receive the pty/tty */ 488 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 489 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 490 error("%s: cannot allocate fds for pty", __func__); 491 if (tmp1 > 0) 492 close(tmp1); 493 if (tmp2 > 0) 494 close(tmp2); 495 return 0; 496 } 497 close(tmp1); 498 close(tmp2); 499 500 buffer_init(&m); 501 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 502 503 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 504 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 505 506 success = buffer_get_int(&m); 507 if (success == 0) { 508 debug3("%s: pty alloc failed", __func__); 509 buffer_free(&m); 510 return (0); 511 } 512 p = buffer_get_string(&m, NULL); 513 msg = buffer_get_string(&m, NULL); 514 buffer_free(&m); 515 516 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 517 free(p); 518 519 buffer_append(&loginmsg, msg, strlen(msg)); 520 free(msg); 521 522 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 523 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 524 fatal("%s: receive fds failed", __func__); 525 526 /* Success */ 527 return (1); 528 } 529 530 void 531 mm_session_pty_cleanup2(Session *s) 532 { 533 Buffer m; 534 535 if (s->ttyfd == -1) 536 return; 537 buffer_init(&m); 538 buffer_put_cstring(&m, s->tty); 539 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 540 buffer_free(&m); 541 542 /* closed dup'ed master */ 543 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 544 error("close(s->ptymaster/%d): %s", 545 s->ptymaster, strerror(errno)); 546 547 /* unlink pty from session */ 548 s->ttyfd = -1; 549 } 550 551 /* Request process termination */ 552 553 void 554 mm_terminate(void) 555 { 556 Buffer m; 557 558 buffer_init(&m); 559 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 560 buffer_free(&m); 561 } 562 563 #ifdef WITH_SSH1 564 int 565 mm_ssh1_session_key(BIGNUM *num) 566 { 567 int rsafail; 568 Buffer m; 569 570 buffer_init(&m); 571 buffer_put_bignum2(&m, num); 572 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); 573 574 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); 575 576 rsafail = buffer_get_int(&m); 577 buffer_get_bignum2(&m, num); 578 579 buffer_free(&m); 580 581 return (rsafail); 582 } 583 #endif 584 585 static void 586 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 587 char ***prompts, u_int **echo_on) 588 { 589 *name = xstrdup(""); 590 *infotxt = xstrdup(""); 591 *numprompts = 1; 592 *prompts = xcalloc(*numprompts, sizeof(char *)); 593 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 594 (*echo_on)[0] = 0; 595 } 596 597 int 598 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 599 u_int *numprompts, char ***prompts, u_int **echo_on) 600 { 601 Buffer m; 602 u_int success; 603 char *challenge; 604 605 debug3("%s: entering", __func__); 606 607 buffer_init(&m); 608 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 609 610 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 611 &m); 612 success = buffer_get_int(&m); 613 if (success == 0) { 614 debug3("%s: no challenge", __func__); 615 buffer_free(&m); 616 return (-1); 617 } 618 619 /* Get the challenge, and format the response */ 620 challenge = buffer_get_string(&m, NULL); 621 buffer_free(&m); 622 623 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 624 (*prompts)[0] = challenge; 625 626 debug3("%s: received challenge: %s", __func__, challenge); 627 628 return (0); 629 } 630 631 int 632 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 633 { 634 Buffer m; 635 int authok; 636 637 debug3("%s: entering", __func__); 638 if (numresponses != 1) 639 return (-1); 640 641 buffer_init(&m); 642 buffer_put_cstring(&m, responses[0]); 643 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 644 645 mm_request_receive_expect(pmonitor->m_recvfd, 646 MONITOR_ANS_BSDAUTHRESPOND, &m); 647 648 authok = buffer_get_int(&m); 649 buffer_free(&m); 650 651 return ((authok == 0) ? -1 : 0); 652 } 653 654 655 void 656 mm_ssh1_session_id(u_char session_id[16]) 657 { 658 Buffer m; 659 int i; 660 661 debug3("%s entering", __func__); 662 663 buffer_init(&m); 664 for (i = 0; i < 16; i++) 665 buffer_put_char(&m, session_id[i]); 666 667 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); 668 buffer_free(&m); 669 } 670 671 #ifdef WITH_SSH1 672 int 673 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) 674 { 675 Buffer m; 676 Key *key; 677 u_char *blob; 678 u_int blen; 679 int allowed = 0, have_forced = 0; 680 681 debug3("%s entering", __func__); 682 683 buffer_init(&m); 684 buffer_put_bignum2(&m, client_n); 685 686 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); 687 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); 688 689 allowed = buffer_get_int(&m); 690 691 /* fake forced command */ 692 auth_clear_options(); 693 have_forced = buffer_get_int(&m); 694 forced_command = have_forced ? xstrdup("true") : NULL; 695 696 if (allowed && rkey != NULL) { 697 blob = buffer_get_string(&m, &blen); 698 if ((key = key_from_blob(blob, blen)) == NULL) 699 fatal("%s: key_from_blob failed", __func__); 700 *rkey = key; 701 free(blob); 702 } 703 buffer_free(&m); 704 705 return (allowed); 706 } 707 708 BIGNUM * 709 mm_auth_rsa_generate_challenge(Key *key) 710 { 711 Buffer m; 712 BIGNUM *challenge; 713 u_char *blob; 714 u_int blen; 715 716 debug3("%s entering", __func__); 717 718 if ((challenge = BN_new()) == NULL) 719 fatal("%s: BN_new failed", __func__); 720 721 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 722 if (key_to_blob(key, &blob, &blen) == 0) 723 fatal("%s: key_to_blob failed", __func__); 724 key->type = KEY_RSA1; 725 726 buffer_init(&m); 727 buffer_put_string(&m, blob, blen); 728 free(blob); 729 730 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); 731 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); 732 733 buffer_get_bignum2(&m, challenge); 734 buffer_free(&m); 735 736 return (challenge); 737 } 738 739 int 740 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) 741 { 742 Buffer m; 743 u_char *blob; 744 u_int blen; 745 int success = 0; 746 747 debug3("%s entering", __func__); 748 749 key->type = KEY_RSA; /* XXX cheat for key_to_blob */ 750 if (key_to_blob(key, &blob, &blen) == 0) 751 fatal("%s: key_to_blob failed", __func__); 752 key->type = KEY_RSA1; 753 754 buffer_init(&m); 755 buffer_put_string(&m, blob, blen); 756 buffer_put_string(&m, response, 16); 757 free(blob); 758 759 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); 760 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); 761 762 success = buffer_get_int(&m); 763 buffer_free(&m); 764 765 return (success); 766 } 767 #endif 768 769 #ifdef GSSAPI 770 OM_uint32 771 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 772 { 773 Buffer m; 774 OM_uint32 major; 775 776 /* Client doesn't get to see the context */ 777 *ctx = NULL; 778 779 buffer_init(&m); 780 buffer_put_string(&m, goid->elements, goid->length); 781 782 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 783 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 784 785 major = buffer_get_int(&m); 786 787 buffer_free(&m); 788 return (major); 789 } 790 791 OM_uint32 792 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 793 gss_buffer_desc *out, OM_uint32 *flags) 794 { 795 Buffer m; 796 OM_uint32 major; 797 u_int len; 798 799 buffer_init(&m); 800 buffer_put_string(&m, in->value, in->length); 801 802 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 803 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 804 805 major = buffer_get_int(&m); 806 out->value = buffer_get_string(&m, &len); 807 out->length = len; 808 if (flags) 809 *flags = buffer_get_int(&m); 810 811 buffer_free(&m); 812 813 return (major); 814 } 815 816 OM_uint32 817 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 818 { 819 Buffer m; 820 OM_uint32 major; 821 822 buffer_init(&m); 823 buffer_put_string(&m, gssbuf->value, gssbuf->length); 824 buffer_put_string(&m, gssmic->value, gssmic->length); 825 826 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 827 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 828 &m); 829 830 major = buffer_get_int(&m); 831 buffer_free(&m); 832 return(major); 833 } 834 835 int 836 mm_ssh_gssapi_userok(char *user) 837 { 838 Buffer m; 839 int authenticated = 0; 840 841 buffer_init(&m); 842 843 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 844 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 845 &m); 846 847 authenticated = buffer_get_int(&m); 848 849 buffer_free(&m); 850 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 851 return (authenticated); 852 } 853 #endif /* GSSAPI */ 854 855