1 /* $NetBSD: monitor_wrap.c,v 1.16 2016/12/25 00:07:47 christos Exp $ */ 2 /* $OpenBSD: monitor_wrap.c,v 1.89 2016/08/13 17:47:41 markus Exp $ */ 3 4 /* 5 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 6 * Copyright 2002 Markus Friedl <markus@openbsd.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "includes.h" 31 __RCSID("$NetBSD: monitor_wrap.c,v 1.16 2016/12/25 00:07:47 christos Exp $"); 32 #include <sys/types.h> 33 #include <sys/uio.h> 34 #include <sys/queue.h> 35 36 #include <errno.h> 37 #include <pwd.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #ifdef WITH_OPENSSL 44 #include <openssl/bn.h> 45 #include <openssl/dh.h> 46 #endif 47 48 #include "xmalloc.h" 49 #include "ssh.h" 50 #ifdef WITH_OPENSSL 51 #include "dh.h" 52 #endif 53 #include "buffer.h" 54 #include "key.h" 55 #include "cipher.h" 56 #include "kex.h" 57 #include "hostfile.h" 58 #include "auth.h" 59 #include "auth-options.h" 60 #include "packet.h" 61 #include "mac.h" 62 #include "log.h" 63 #include <zlib.h> 64 #include "monitor.h" 65 #ifdef GSSAPI 66 #include "ssh-gss.h" 67 #endif 68 #include "monitor_wrap.h" 69 #include "atomicio.h" 70 #include "monitor_fdpass.h" 71 #ifdef USE_PAM 72 #include "misc.h" 73 #include "servconf.h" 74 #include <security/pam_appl.h> 75 #endif 76 #include "misc.h" 77 #include "uuencode.h" 78 79 #include "channels.h" 80 #include "session.h" 81 #include "servconf.h" 82 83 #include "ssherr.h" 84 85 /* Imports */ 86 extern z_stream incoming_stream; 87 extern z_stream outgoing_stream; 88 extern struct monitor *pmonitor; 89 extern Buffer loginmsg; 90 extern ServerOptions options; 91 92 void 93 mm_log_handler(LogLevel level, const char *msg, void *ctx) 94 { 95 Buffer log_msg; 96 struct monitor *mon = (struct monitor *)ctx; 97 98 if (mon->m_log_sendfd == -1) 99 fatal("%s: no log channel", __func__); 100 101 buffer_init(&log_msg); 102 /* 103 * Placeholder for packet length. Will be filled in with the actual 104 * packet length once the packet has been constucted. This saves 105 * fragile math. 106 */ 107 buffer_put_int(&log_msg, 0); 108 109 buffer_put_int(&log_msg, level); 110 buffer_put_cstring(&log_msg, msg); 111 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); 112 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), 113 buffer_len(&log_msg)) != buffer_len(&log_msg)) 114 fatal("%s: write: %s", __func__, strerror(errno)); 115 buffer_free(&log_msg); 116 } 117 118 int 119 mm_is_monitor(void) 120 { 121 /* 122 * m_pid is only set in the privileged part, and 123 * points to the unprivileged child. 124 */ 125 return (pmonitor && pmonitor->m_pid > 0); 126 } 127 128 void 129 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 130 { 131 u_int mlen = buffer_len(m); 132 u_char buf[5]; 133 134 debug3("%s entering: type %d", __func__, type); 135 136 put_u32(buf, mlen + 1); 137 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 138 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 139 fatal("%s: write: %s", __func__, strerror(errno)); 140 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 141 fatal("%s: write: %s", __func__, strerror(errno)); 142 } 143 144 void 145 mm_request_receive(int sock, Buffer *m) 146 { 147 u_char buf[4]; 148 u_int msg_len; 149 150 debug3("%s entering", __func__); 151 152 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 153 if (errno == EPIPE) 154 cleanup_exit(255); 155 fatal("%s: read: %s", __func__, strerror(errno)); 156 } 157 msg_len = get_u32(buf); 158 if (msg_len > 256 * 1024) 159 fatal("%s: read: bad msg_len %d", __func__, msg_len); 160 buffer_clear(m); 161 buffer_append_space(m, msg_len); 162 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 163 fatal("%s: read: %s", __func__, strerror(errno)); 164 } 165 166 void 167 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 168 { 169 u_char rtype; 170 171 debug3("%s entering: type %d", __func__, type); 172 173 mm_request_receive(sock, m); 174 rtype = buffer_get_char(m); 175 if (rtype != type) 176 fatal("%s: read: rtype %d != type %d", __func__, 177 rtype, type); 178 } 179 180 #ifdef WITH_OPENSSL 181 DH * 182 mm_choose_dh(int min, int nbits, int max) 183 { 184 BIGNUM *p, *g; 185 int success = 0; 186 Buffer m; 187 188 buffer_init(&m); 189 buffer_put_int(&m, min); 190 buffer_put_int(&m, nbits); 191 buffer_put_int(&m, max); 192 193 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 194 195 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 196 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 197 198 success = buffer_get_char(&m); 199 if (success == 0) 200 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 201 202 if ((p = BN_new()) == NULL) 203 fatal("%s: BN_new failed", __func__); 204 if ((g = BN_new()) == NULL) 205 fatal("%s: BN_new failed", __func__); 206 buffer_get_bignum2(&m, p); 207 buffer_get_bignum2(&m, g); 208 209 debug3("%s: remaining %d", __func__, buffer_len(&m)); 210 buffer_free(&m); 211 212 return (dh_new_group(g, p)); 213 } 214 #endif 215 216 int 217 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, 218 const u_char *data, u_int datalen, const char *hostkey_alg) 219 { 220 struct kex *kex = *pmonitor->m_pkex; 221 Buffer m; 222 223 debug3("%s entering", __func__); 224 225 buffer_init(&m); 226 buffer_put_int(&m, kex->host_key_index(key, 0, active_state)); 227 buffer_put_string(&m, data, datalen); 228 buffer_put_cstring(&m, hostkey_alg); 229 230 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 231 232 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 233 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 234 *sigp = buffer_get_string(&m, lenp); 235 buffer_free(&m); 236 237 return (0); 238 } 239 240 struct passwd * 241 mm_getpwnamallow(const char *username) 242 { 243 Buffer m; 244 struct passwd *pw; 245 u_int len, i; 246 ServerOptions *newopts; 247 248 debug3("%s entering", __func__); 249 250 buffer_init(&m); 251 buffer_put_cstring(&m, username); 252 253 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 254 255 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 256 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 257 258 if (buffer_get_char(&m) == 0) { 259 pw = NULL; 260 goto out; 261 } 262 pw = buffer_get_string(&m, &len); 263 if (len != sizeof(struct passwd)) 264 fatal("%s: struct passwd size mismatch", __func__); 265 pw->pw_name = buffer_get_string(&m, NULL); 266 pw->pw_passwd = buffer_get_string(&m, NULL); 267 pw->pw_gecos = buffer_get_string(&m, NULL); 268 pw->pw_class = buffer_get_string(&m, NULL); 269 pw->pw_dir = buffer_get_string(&m, NULL); 270 pw->pw_shell = buffer_get_string(&m, NULL); 271 272 out: 273 /* copy options block as a Match directive may have changed some */ 274 newopts = buffer_get_string(&m, &len); 275 if (len != sizeof(*newopts)) 276 fatal("%s: option block size mismatch", __func__); 277 278 #define M_CP_STROPT(x) do { \ 279 if (newopts->x != NULL) \ 280 newopts->x = buffer_get_string(&m, NULL); \ 281 } while (0) 282 #define M_CP_STRARRAYOPT(x, nx) do { \ 283 for (i = 0; i < newopts->nx; i++) \ 284 newopts->x[i] = buffer_get_string(&m, NULL); \ 285 } while (0) 286 /* See comment in servconf.h */ 287 COPY_MATCH_STRING_OPTS(); 288 #undef M_CP_STROPT 289 #undef M_CP_STRARRAYOPT 290 291 copy_set_server_options(&options, newopts, 1); 292 free(newopts); 293 294 buffer_free(&m); 295 296 return (pw); 297 } 298 299 char * 300 mm_auth2_read_banner(void) 301 { 302 Buffer m; 303 char *banner; 304 305 debug3("%s entering", __func__); 306 307 buffer_init(&m); 308 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 309 buffer_clear(&m); 310 311 mm_request_receive_expect(pmonitor->m_recvfd, 312 MONITOR_ANS_AUTH2_READ_BANNER, &m); 313 banner = buffer_get_string(&m, NULL); 314 buffer_free(&m); 315 316 /* treat empty banner as missing banner */ 317 if (strlen(banner) == 0) { 318 free(banner); 319 banner = NULL; 320 } 321 return (banner); 322 } 323 324 /* Inform the privileged process about service and style */ 325 326 void 327 mm_inform_authserv(char *service, char *style) 328 { 329 Buffer m; 330 331 debug3("%s entering", __func__); 332 333 buffer_init(&m); 334 buffer_put_cstring(&m, service); 335 buffer_put_cstring(&m, style ? style : ""); 336 337 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 338 339 buffer_free(&m); 340 } 341 342 /* Do the password authentication */ 343 int 344 mm_auth_password(Authctxt *authctxt, const char *password) 345 { 346 Buffer m; 347 int authenticated = 0; 348 349 debug3("%s entering", __func__); 350 351 buffer_init(&m); 352 buffer_put_cstring(&m, password); 353 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 354 355 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 356 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 357 358 authenticated = buffer_get_int(&m); 359 360 buffer_free(&m); 361 362 debug3("%s: user %sauthenticated", 363 __func__, authenticated ? "" : "not "); 364 return (authenticated); 365 } 366 367 int 368 mm_user_key_allowed(struct passwd *pw, Key *key, int pubkey_auth_attempt) 369 { 370 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key, 371 pubkey_auth_attempt)); 372 } 373 374 int 375 mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host, 376 Key *key) 377 { 378 return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0)); 379 } 380 381 int 382 mm_key_allowed(enum mm_keytype type, const char *user, const char *host, 383 Key *key, int pubkey_auth_attempt) 384 { 385 Buffer m; 386 u_char *blob; 387 u_int len; 388 int allowed = 0, have_forced = 0; 389 390 debug3("%s entering", __func__); 391 392 /* Convert the key to a blob and the pass it over */ 393 if (!key_to_blob(key, &blob, &len)) 394 return (0); 395 396 buffer_init(&m); 397 buffer_put_int(&m, type); 398 buffer_put_cstring(&m, user ? user : ""); 399 buffer_put_cstring(&m, host ? host : ""); 400 buffer_put_string(&m, blob, len); 401 buffer_put_int(&m, pubkey_auth_attempt); 402 free(blob); 403 404 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 405 406 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 407 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 408 409 allowed = buffer_get_int(&m); 410 411 /* fake forced command */ 412 auth_clear_options(); 413 have_forced = buffer_get_int(&m); 414 forced_command = have_forced ? xstrdup("true") : NULL; 415 416 buffer_free(&m); 417 418 return (allowed); 419 } 420 421 /* 422 * This key verify needs to send the key type along, because the 423 * privileged parent makes the decision if the key is allowed 424 * for authentication. 425 */ 426 427 int 428 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 429 { 430 Buffer m; 431 u_char *blob; 432 u_int len; 433 int verified = 0; 434 435 debug3("%s entering", __func__); 436 437 /* Convert the key to a blob and the pass it over */ 438 if (!key_to_blob(key, &blob, &len)) 439 return (0); 440 441 buffer_init(&m); 442 buffer_put_string(&m, blob, len); 443 buffer_put_string(&m, sig, siglen); 444 buffer_put_string(&m, data, datalen); 445 free(blob); 446 447 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 448 449 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 450 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 451 452 verified = buffer_get_int(&m); 453 454 buffer_free(&m); 455 456 return (verified); 457 } 458 459 void 460 mm_send_keystate(struct monitor *monitor) 461 { 462 struct ssh *ssh = active_state; /* XXX */ 463 struct sshbuf *m; 464 int r; 465 466 if ((m = sshbuf_new()) == NULL) 467 fatal("%s: sshbuf_new failed", __func__); 468 if ((r = ssh_packet_get_state(ssh, m)) != 0) 469 fatal("%s: get_state failed: %s", 470 __func__, ssh_err(r)); 471 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m); 472 debug3("%s: Finished sending state", __func__); 473 sshbuf_free(m); 474 } 475 476 int 477 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 478 { 479 Buffer m; 480 char *p, *msg; 481 int success = 0, tmp1 = -1, tmp2 = -1; 482 483 /* Kludge: ensure there are fds free to receive the pty/tty */ 484 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 485 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 486 error("%s: cannot allocate fds for pty", __func__); 487 if (tmp1 > 0) 488 close(tmp1); 489 if (tmp2 > 0) 490 close(tmp2); 491 return 0; 492 } 493 close(tmp1); 494 close(tmp2); 495 496 buffer_init(&m); 497 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 498 499 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 500 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 501 502 success = buffer_get_int(&m); 503 if (success == 0) { 504 debug3("%s: pty alloc failed", __func__); 505 buffer_free(&m); 506 return (0); 507 } 508 p = buffer_get_string(&m, NULL); 509 msg = buffer_get_string(&m, NULL); 510 buffer_free(&m); 511 512 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 513 free(p); 514 515 buffer_append(&loginmsg, msg, strlen(msg)); 516 free(msg); 517 518 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 519 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 520 fatal("%s: receive fds failed", __func__); 521 522 /* Success */ 523 return (1); 524 } 525 526 void 527 mm_session_pty_cleanup2(Session *s) 528 { 529 Buffer m; 530 531 if (s->ttyfd == -1) 532 return; 533 buffer_init(&m); 534 buffer_put_cstring(&m, s->tty); 535 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 536 buffer_free(&m); 537 538 /* closed dup'ed master */ 539 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 540 error("close(s->ptymaster/%d): %s", 541 s->ptymaster, strerror(errno)); 542 543 /* unlink pty from session */ 544 s->ttyfd = -1; 545 } 546 547 #ifdef USE_PAM 548 void 549 mm_start_pam(Authctxt *authctxt) 550 { 551 Buffer m; 552 553 debug3("%s entering", __func__); 554 if (!options.use_pam) 555 fatal("UsePAM=no, but ended up in %s anyway", __func__); 556 557 buffer_init(&m); 558 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 559 560 buffer_free(&m); 561 } 562 563 u_int 564 mm_do_pam_account(void) 565 { 566 Buffer m; 567 u_int ret; 568 char *msg; 569 570 debug3("%s entering", __func__); 571 if (!options.use_pam) 572 fatal("UsePAM=no, but ended up in %s anyway", __func__); 573 574 buffer_init(&m); 575 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 576 577 mm_request_receive_expect(pmonitor->m_recvfd, 578 MONITOR_ANS_PAM_ACCOUNT, &m); 579 ret = buffer_get_int(&m); 580 msg = buffer_get_string(&m, NULL); 581 buffer_append(&loginmsg, msg, strlen(msg)); 582 free(msg); 583 584 buffer_free(&m); 585 586 debug3("%s returning %d", __func__, ret); 587 588 return (ret); 589 } 590 591 void * 592 mm_sshpam_init_ctx(Authctxt *authctxt) 593 { 594 Buffer m; 595 int success; 596 597 debug3("%s", __func__); 598 buffer_init(&m); 599 buffer_put_cstring(&m, authctxt->user); 600 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 601 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 602 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 603 success = buffer_get_int(&m); 604 if (success == 0) { 605 debug3("%s: pam_init_ctx failed", __func__); 606 buffer_free(&m); 607 return (NULL); 608 } 609 buffer_free(&m); 610 return (authctxt); 611 } 612 613 int 614 mm_sshpam_query(void *ctx, char **name, char **info, 615 u_int *num, char ***prompts, u_int **echo_on) 616 { 617 Buffer m; 618 u_int i; 619 int ret; 620 621 debug3("%s", __func__); 622 buffer_init(&m); 623 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 624 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 625 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 626 ret = buffer_get_int(&m); 627 debug3("%s: pam_query returned %d", __func__, ret); 628 *name = buffer_get_string(&m, NULL); 629 *info = buffer_get_string(&m, NULL); 630 *num = buffer_get_int(&m); 631 if (*num > PAM_MAX_NUM_MSG) 632 fatal("%s: received %u PAM messages, expected <= %u", 633 __func__, *num, PAM_MAX_NUM_MSG); 634 *prompts = xcalloc((*num + 1), sizeof(char *)); 635 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 636 for (i = 0; i < *num; ++i) { 637 (*prompts)[i] = buffer_get_string(&m, NULL); 638 (*echo_on)[i] = buffer_get_int(&m); 639 } 640 buffer_free(&m); 641 return (ret); 642 } 643 644 int 645 mm_sshpam_respond(void *ctx, u_int num, char **resp) 646 { 647 Buffer m; 648 u_int i; 649 int ret; 650 651 debug3("%s", __func__); 652 buffer_init(&m); 653 buffer_put_int(&m, num); 654 for (i = 0; i < num; ++i) 655 buffer_put_cstring(&m, resp[i]); 656 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 657 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 658 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 659 ret = buffer_get_int(&m); 660 debug3("%s: pam_respond returned %d", __func__, ret); 661 buffer_free(&m); 662 return (ret); 663 } 664 665 void 666 mm_sshpam_free_ctx(void *ctxtp) 667 { 668 Buffer m; 669 670 debug3("%s", __func__); 671 buffer_init(&m); 672 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 673 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 674 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 675 buffer_free(&m); 676 } 677 #endif /* USE_PAM */ 678 679 /* Request process termination */ 680 681 void 682 mm_terminate(void) 683 { 684 Buffer m; 685 686 buffer_init(&m); 687 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 688 buffer_free(&m); 689 } 690 691 #if defined(BSD_AUTH) || defined(SKEY) 692 static void 693 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 694 char ***prompts, u_int **echo_on) 695 { 696 *name = xstrdup(""); 697 *infotxt = xstrdup(""); 698 *numprompts = 1; 699 *prompts = xcalloc(*numprompts, sizeof(char *)); 700 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 701 (*echo_on)[0] = 0; 702 } 703 704 #ifdef BSD_AUTH 705 int 706 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 707 u_int *numprompts, char ***prompts, u_int **echo_on) 708 { 709 Buffer m; 710 u_int success; 711 char *challenge; 712 713 debug3("%s: entering", __func__); 714 715 buffer_init(&m); 716 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 717 718 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 719 &m); 720 success = buffer_get_int(&m); 721 if (success == 0) { 722 debug3("%s: no challenge", __func__); 723 buffer_free(&m); 724 return (-1); 725 } 726 727 /* Get the challenge, and format the response */ 728 challenge = buffer_get_string(&m, NULL); 729 buffer_free(&m); 730 731 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 732 (*prompts)[0] = challenge; 733 734 debug3("%s: received challenge: %s", __func__, challenge); 735 736 return (0); 737 } 738 739 int 740 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 741 { 742 Buffer m; 743 int authok; 744 745 debug3("%s: entering", __func__); 746 if (numresponses != 1) 747 return (-1); 748 749 buffer_init(&m); 750 buffer_put_cstring(&m, responses[0]); 751 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 752 753 mm_request_receive_expect(pmonitor->m_recvfd, 754 MONITOR_ANS_BSDAUTHRESPOND, &m); 755 756 authok = buffer_get_int(&m); 757 buffer_free(&m); 758 759 return ((authok == 0) ? -1 : 0); 760 } 761 #endif 762 763 #ifdef SKEY 764 int 765 mm_skey_query(void *ctx, char **name, char **infotxt, 766 u_int *numprompts, char ***prompts, u_int **echo_on) 767 { 768 Buffer m; 769 u_int success; 770 char *challenge; 771 772 debug3("%s: entering", __func__); 773 774 buffer_init(&m); 775 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 776 777 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 778 &m); 779 success = buffer_get_int(&m); 780 if (success == 0) { 781 debug3("%s: no challenge", __func__); 782 buffer_free(&m); 783 return (-1); 784 } 785 786 /* Get the challenge, and format the response */ 787 challenge = buffer_get_string(&m, NULL); 788 buffer_free(&m); 789 790 debug3("%s: received challenge: %s", __func__, challenge); 791 792 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 793 794 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); 795 free(challenge); 796 797 return (0); 798 } 799 800 int 801 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 802 { 803 Buffer m; 804 int authok; 805 806 debug3("%s: entering", __func__); 807 if (numresponses != 1) 808 return (-1); 809 810 buffer_init(&m); 811 buffer_put_cstring(&m, responses[0]); 812 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 813 814 mm_request_receive_expect(pmonitor->m_recvfd, 815 MONITOR_ANS_SKEYRESPOND, &m); 816 817 authok = buffer_get_int(&m); 818 buffer_free(&m); 819 820 return ((authok == 0) ? -1 : 0); 821 } 822 #endif /* SKEY */ 823 #endif /* BSDAUTH || SKEY */ 824 825 #ifdef GSSAPI 826 OM_uint32 827 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 828 { 829 Buffer m; 830 OM_uint32 major; 831 832 /* Client doesn't get to see the context */ 833 *ctx = NULL; 834 835 buffer_init(&m); 836 buffer_put_string(&m, goid->elements, goid->length); 837 838 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 839 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 840 841 major = buffer_get_int(&m); 842 843 buffer_free(&m); 844 return (major); 845 } 846 847 OM_uint32 848 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 849 gss_buffer_desc *out, OM_uint32 *flags) 850 { 851 Buffer m; 852 OM_uint32 major; 853 u_int len; 854 855 buffer_init(&m); 856 buffer_put_string(&m, in->value, in->length); 857 858 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 859 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 860 861 major = buffer_get_int(&m); 862 out->value = buffer_get_string(&m, &len); 863 out->length = len; 864 if (flags) 865 *flags = buffer_get_int(&m); 866 867 buffer_free(&m); 868 869 return (major); 870 } 871 872 OM_uint32 873 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 874 { 875 Buffer m; 876 OM_uint32 major; 877 878 buffer_init(&m); 879 buffer_put_string(&m, gssbuf->value, gssbuf->length); 880 buffer_put_string(&m, gssmic->value, gssmic->length); 881 882 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 883 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 884 &m); 885 886 major = buffer_get_int(&m); 887 buffer_free(&m); 888 return(major); 889 } 890 891 int 892 mm_ssh_gssapi_userok(char *user) 893 { 894 Buffer m; 895 int authenticated = 0; 896 897 buffer_init(&m); 898 899 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 900 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 901 &m); 902 903 authenticated = buffer_get_int(&m); 904 905 buffer_free(&m); 906 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 907 return (authenticated); 908 } 909 #endif /* GSSAPI */ 910 911 #ifdef KRB5 912 int 913 mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp) 914 { 915 krb5_data *tkt, *reply; 916 Buffer m; 917 int success; 918 919 debug3("%s entering", __func__); 920 tkt = (krb5_data *) argp; 921 reply = (krb5_data *) resp; 922 923 buffer_init(&m); 924 buffer_put_string(&m, tkt->data, tkt->length); 925 926 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m); 927 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m); 928 929 success = buffer_get_int(&m); 930 if (success) { 931 u_int len; 932 933 *userp = buffer_get_string(&m, NULL); 934 reply->data = buffer_get_string(&m, &len); 935 reply->length = len; 936 } else { 937 memset(reply, 0, sizeof(*reply)); 938 *userp = NULL; 939 } 940 941 buffer_free(&m); 942 return (success); 943 } 944 #endif 945