1 /* $OpenBSD: monitor_wrap.c,v 1.94 2017/10/02 19:33:20 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 "includes.h" 29 30 #include <sys/types.h> 31 #include <sys/uio.h> 32 33 #include <errno.h> 34 #include <pwd.h> 35 #include <signal.h> 36 #include <stdarg.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 #ifdef WITH_OPENSSL 42 #include <openssl/bn.h> 43 #include <openssl/dh.h> 44 #include <openssl/evp.h> 45 #endif 46 47 #include "openbsd-compat/sys-queue.h" 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 "auth-pam.h" 64 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ 65 #undef TARGET_OS_MAC 66 #include "zlib.h" 67 #define TARGET_OS_MAC 1 68 #else 69 #include "zlib.h" 70 #endif 71 #include "monitor.h" 72 #ifdef GSSAPI 73 #include "ssh-gss.h" 74 #endif 75 #include "monitor_wrap.h" 76 #include "atomicio.h" 77 #include "monitor_fdpass.h" 78 #include "misc.h" 79 #include "uuencode.h" 80 81 #include "channels.h" 82 #include "session.h" 83 #include "servconf.h" 84 85 #include "ssherr.h" 86 87 /* Imports */ 88 extern z_stream incoming_stream; 89 extern z_stream outgoing_stream; 90 extern struct monitor *pmonitor; 91 extern Buffer loginmsg; 92 extern ServerOptions options; 93 94 void 95 mm_log_handler(LogLevel level, const char *msg, void *ctx) 96 { 97 Buffer log_msg; 98 struct monitor *mon = (struct monitor *)ctx; 99 100 if (mon->m_log_sendfd == -1) 101 fatal("%s: no log channel", __func__); 102 103 buffer_init(&log_msg); 104 /* 105 * Placeholder for packet length. Will be filled in with the actual 106 * packet length once the packet has been constucted. This saves 107 * fragile math. 108 */ 109 buffer_put_int(&log_msg, 0); 110 111 buffer_put_int(&log_msg, level); 112 buffer_put_cstring(&log_msg, msg); 113 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); 114 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), 115 buffer_len(&log_msg)) != buffer_len(&log_msg)) 116 fatal("%s: write: %s", __func__, strerror(errno)); 117 buffer_free(&log_msg); 118 } 119 120 int 121 mm_is_monitor(void) 122 { 123 /* 124 * m_pid is only set in the privileged part, and 125 * points to the unprivileged child. 126 */ 127 return (pmonitor && pmonitor->m_pid > 0); 128 } 129 130 void 131 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 132 { 133 u_int mlen = buffer_len(m); 134 u_char buf[5]; 135 136 debug3("%s entering: type %d", __func__, type); 137 138 put_u32(buf, mlen + 1); 139 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 140 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 141 fatal("%s: write: %s", __func__, strerror(errno)); 142 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 143 fatal("%s: write: %s", __func__, strerror(errno)); 144 } 145 146 void 147 mm_request_receive(int sock, Buffer *m) 148 { 149 u_char buf[4]; 150 u_int msg_len; 151 152 debug3("%s entering", __func__); 153 154 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 155 if (errno == EPIPE) 156 cleanup_exit(255); 157 fatal("%s: read: %s", __func__, strerror(errno)); 158 } 159 msg_len = get_u32(buf); 160 if (msg_len > 256 * 1024) 161 fatal("%s: read: bad msg_len %d", __func__, msg_len); 162 buffer_clear(m); 163 buffer_append_space(m, msg_len); 164 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 165 fatal("%s: read: %s", __func__, strerror(errno)); 166 } 167 168 void 169 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 170 { 171 u_char rtype; 172 173 debug3("%s entering: type %d", __func__, type); 174 175 mm_request_receive(sock, m); 176 rtype = buffer_get_char(m); 177 if (rtype != type) 178 fatal("%s: read: rtype %d != type %d", __func__, 179 rtype, type); 180 } 181 182 #ifdef WITH_OPENSSL 183 DH * 184 mm_choose_dh(int min, int nbits, int max) 185 { 186 BIGNUM *p, *g; 187 int success = 0; 188 Buffer m; 189 190 buffer_init(&m); 191 buffer_put_int(&m, min); 192 buffer_put_int(&m, nbits); 193 buffer_put_int(&m, max); 194 195 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 196 197 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 198 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 199 200 success = buffer_get_char(&m); 201 if (success == 0) 202 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 203 204 if ((p = BN_new()) == NULL) 205 fatal("%s: BN_new failed", __func__); 206 if ((g = BN_new()) == NULL) 207 fatal("%s: BN_new failed", __func__); 208 buffer_get_bignum2(&m, p); 209 buffer_get_bignum2(&m, g); 210 211 debug3("%s: remaining %d", __func__, buffer_len(&m)); 212 buffer_free(&m); 213 214 return (dh_new_group(g, p)); 215 } 216 #endif 217 218 int 219 mm_key_sign(struct sshkey *key, u_char **sigp, u_int *lenp, 220 const u_char *data, u_int datalen, const char *hostkey_alg) 221 { 222 struct kex *kex = *pmonitor->m_pkex; 223 Buffer m; 224 225 debug3("%s entering", __func__); 226 227 buffer_init(&m); 228 buffer_put_int(&m, kex->host_key_index(key, 0, active_state)); 229 buffer_put_string(&m, data, datalen); 230 buffer_put_cstring(&m, hostkey_alg); 231 232 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 233 234 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 235 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 236 *sigp = buffer_get_string(&m, lenp); 237 buffer_free(&m); 238 239 return (0); 240 } 241 242 struct passwd * 243 mm_getpwnamallow(const char *username) 244 { 245 struct ssh *ssh = active_state; /* XXX */ 246 Buffer m; 247 struct passwd *pw; 248 u_int len, i; 249 ServerOptions *newopts; 250 251 debug3("%s entering", __func__); 252 253 buffer_init(&m); 254 buffer_put_cstring(&m, username); 255 256 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 257 258 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 259 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 260 261 if (buffer_get_char(&m) == 0) { 262 pw = NULL; 263 goto out; 264 } 265 pw = buffer_get_string(&m, &len); 266 if (len != sizeof(struct passwd)) 267 fatal("%s: struct passwd size mismatch", __func__); 268 pw->pw_name = buffer_get_string(&m, NULL); 269 pw->pw_passwd = buffer_get_string(&m, NULL); 270 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 271 pw->pw_gecos = buffer_get_string(&m, NULL); 272 #endif 273 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 274 pw->pw_class = buffer_get_string(&m, NULL); 275 #endif 276 pw->pw_dir = buffer_get_string(&m, NULL); 277 pw->pw_shell = buffer_get_string(&m, NULL); 278 279 out: 280 /* copy options block as a Match directive may have changed some */ 281 newopts = buffer_get_string(&m, &len); 282 if (len != sizeof(*newopts)) 283 fatal("%s: option block size mismatch", __func__); 284 285 #define M_CP_STROPT(x) do { \ 286 if (newopts->x != NULL) \ 287 newopts->x = buffer_get_string(&m, NULL); \ 288 } while (0) 289 #define M_CP_STRARRAYOPT(x, nx) do { \ 290 for (i = 0; i < newopts->nx; i++) \ 291 newopts->x[i] = buffer_get_string(&m, NULL); \ 292 } while (0) 293 #define M_CP_STRARRAYOPT_ALLOC(x, nx) do { \ 294 newopts->x = newopts->nx == 0 ? \ 295 NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \ 296 M_CP_STRARRAYOPT(x, nx); \ 297 } while (0) 298 /* See comment in servconf.h */ 299 COPY_MATCH_STRING_OPTS(); 300 #undef M_CP_STROPT 301 #undef M_CP_STRARRAYOPT 302 #undef M_CP_STRARRAYOPT_ALLOC 303 304 copy_set_server_options(&options, newopts, 1); 305 log_change_level(options.log_level); 306 process_permitopen(ssh, &options); 307 free(newopts); 308 309 buffer_free(&m); 310 311 return (pw); 312 } 313 314 char * 315 mm_auth2_read_banner(void) 316 { 317 Buffer m; 318 char *banner; 319 320 debug3("%s entering", __func__); 321 322 buffer_init(&m); 323 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 324 buffer_clear(&m); 325 326 mm_request_receive_expect(pmonitor->m_recvfd, 327 MONITOR_ANS_AUTH2_READ_BANNER, &m); 328 banner = buffer_get_string(&m, NULL); 329 buffer_free(&m); 330 331 /* treat empty banner as missing banner */ 332 if (strlen(banner) == 0) { 333 free(banner); 334 banner = NULL; 335 } 336 return (banner); 337 } 338 339 /* Inform the privileged process about service and style */ 340 341 void 342 mm_inform_authserv(char *service, char *style) 343 { 344 Buffer m; 345 346 debug3("%s entering", __func__); 347 348 buffer_init(&m); 349 buffer_put_cstring(&m, service); 350 buffer_put_cstring(&m, style ? style : ""); 351 352 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 353 354 buffer_free(&m); 355 } 356 357 /* Do the password authentication */ 358 int 359 mm_auth_password(Authctxt *authctxt, char *password) 360 { 361 Buffer m; 362 int authenticated = 0; 363 364 debug3("%s entering", __func__); 365 366 buffer_init(&m); 367 buffer_put_cstring(&m, password); 368 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 369 370 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 371 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 372 373 authenticated = buffer_get_int(&m); 374 #ifdef USE_PAM 375 sshpam_set_maxtries_reached(buffer_get_int(&m)); 376 #endif 377 378 buffer_free(&m); 379 380 debug3("%s: user %sauthenticated", 381 __func__, authenticated ? "" : "not "); 382 return (authenticated); 383 } 384 385 int 386 mm_user_key_allowed(struct passwd *pw, struct sshkey *key, 387 int pubkey_auth_attempt) 388 { 389 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key, 390 pubkey_auth_attempt)); 391 } 392 393 int 394 mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host, 395 struct sshkey *key) 396 { 397 return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0)); 398 } 399 400 int 401 mm_key_allowed(enum mm_keytype type, const char *user, const char *host, 402 struct sshkey *key, int pubkey_auth_attempt) 403 { 404 Buffer m; 405 u_char *blob; 406 u_int len; 407 int allowed = 0, have_forced = 0; 408 409 debug3("%s entering", __func__); 410 411 /* Convert the key to a blob and the pass it over */ 412 if (!key_to_blob(key, &blob, &len)) 413 return (0); 414 415 buffer_init(&m); 416 buffer_put_int(&m, type); 417 buffer_put_cstring(&m, user ? user : ""); 418 buffer_put_cstring(&m, host ? host : ""); 419 buffer_put_string(&m, blob, len); 420 buffer_put_int(&m, pubkey_auth_attempt); 421 free(blob); 422 423 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 424 425 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 426 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 427 428 allowed = buffer_get_int(&m); 429 430 /* fake forced command */ 431 auth_clear_options(); 432 have_forced = buffer_get_int(&m); 433 forced_command = have_forced ? xstrdup("true") : NULL; 434 435 buffer_free(&m); 436 437 return (allowed); 438 } 439 440 /* 441 * This key verify needs to send the key type along, because the 442 * privileged parent makes the decision if the key is allowed 443 * for authentication. 444 */ 445 446 int 447 mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen, 448 const u_char *data, size_t datalen, u_int compat) 449 { 450 Buffer m; 451 u_char *blob; 452 u_int len; 453 u_int encoded_ret = 0; 454 455 debug3("%s entering", __func__); 456 457 /* Convert the key to a blob and the pass it over */ 458 if (!key_to_blob(key, &blob, &len)) 459 return (0); 460 461 buffer_init(&m); 462 buffer_put_string(&m, blob, len); 463 buffer_put_string(&m, sig, siglen); 464 buffer_put_string(&m, data, datalen); 465 free(blob); 466 467 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 468 469 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 470 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 471 472 encoded_ret = buffer_get_int(&m); 473 474 buffer_free(&m); 475 476 if (encoded_ret != 0) 477 return SSH_ERR_SIGNATURE_INVALID; 478 return 0; 479 } 480 481 void 482 mm_send_keystate(struct monitor *monitor) 483 { 484 struct ssh *ssh = active_state; /* XXX */ 485 struct sshbuf *m; 486 int r; 487 488 if ((m = sshbuf_new()) == NULL) 489 fatal("%s: sshbuf_new failed", __func__); 490 if ((r = ssh_packet_get_state(ssh, m)) != 0) 491 fatal("%s: get_state failed: %s", 492 __func__, ssh_err(r)); 493 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m); 494 debug3("%s: Finished sending state", __func__); 495 sshbuf_free(m); 496 } 497 498 int 499 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 500 { 501 Buffer m; 502 char *p, *msg; 503 int success = 0, tmp1 = -1, tmp2 = -1; 504 505 /* Kludge: ensure there are fds free to receive the pty/tty */ 506 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 507 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 508 error("%s: cannot allocate fds for pty", __func__); 509 if (tmp1 > 0) 510 close(tmp1); 511 if (tmp2 > 0) 512 close(tmp2); 513 return 0; 514 } 515 close(tmp1); 516 close(tmp2); 517 518 buffer_init(&m); 519 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 520 521 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 522 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 523 524 success = buffer_get_int(&m); 525 if (success == 0) { 526 debug3("%s: pty alloc failed", __func__); 527 buffer_free(&m); 528 return (0); 529 } 530 p = buffer_get_string(&m, NULL); 531 msg = buffer_get_string(&m, NULL); 532 buffer_free(&m); 533 534 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 535 free(p); 536 537 buffer_append(&loginmsg, msg, strlen(msg)); 538 free(msg); 539 540 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 541 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 542 fatal("%s: receive fds failed", __func__); 543 544 /* Success */ 545 return (1); 546 } 547 548 void 549 mm_session_pty_cleanup2(Session *s) 550 { 551 Buffer m; 552 553 if (s->ttyfd == -1) 554 return; 555 buffer_init(&m); 556 buffer_put_cstring(&m, s->tty); 557 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 558 buffer_free(&m); 559 560 /* closed dup'ed master */ 561 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 562 error("close(s->ptymaster/%d): %s", 563 s->ptymaster, strerror(errno)); 564 565 /* unlink pty from session */ 566 s->ttyfd = -1; 567 } 568 569 #ifdef USE_PAM 570 void 571 mm_start_pam(Authctxt *authctxt) 572 { 573 Buffer m; 574 575 debug3("%s entering", __func__); 576 if (!options.use_pam) 577 fatal("UsePAM=no, but ended up in %s anyway", __func__); 578 579 buffer_init(&m); 580 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 581 582 buffer_free(&m); 583 } 584 585 u_int 586 mm_do_pam_account(void) 587 { 588 Buffer m; 589 u_int ret; 590 char *msg; 591 592 debug3("%s entering", __func__); 593 if (!options.use_pam) 594 fatal("UsePAM=no, but ended up in %s anyway", __func__); 595 596 buffer_init(&m); 597 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 598 599 mm_request_receive_expect(pmonitor->m_recvfd, 600 MONITOR_ANS_PAM_ACCOUNT, &m); 601 ret = buffer_get_int(&m); 602 msg = buffer_get_string(&m, NULL); 603 buffer_append(&loginmsg, msg, strlen(msg)); 604 free(msg); 605 606 buffer_free(&m); 607 608 debug3("%s returning %d", __func__, ret); 609 610 return (ret); 611 } 612 613 void * 614 mm_sshpam_init_ctx(Authctxt *authctxt) 615 { 616 Buffer m; 617 int success; 618 619 debug3("%s", __func__); 620 buffer_init(&m); 621 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 622 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 623 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 624 success = buffer_get_int(&m); 625 if (success == 0) { 626 debug3("%s: pam_init_ctx failed", __func__); 627 buffer_free(&m); 628 return (NULL); 629 } 630 buffer_free(&m); 631 return (authctxt); 632 } 633 634 int 635 mm_sshpam_query(void *ctx, char **name, char **info, 636 u_int *num, char ***prompts, u_int **echo_on) 637 { 638 Buffer m; 639 u_int i; 640 int ret; 641 642 debug3("%s", __func__); 643 buffer_init(&m); 644 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 645 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 646 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 647 ret = buffer_get_int(&m); 648 debug3("%s: pam_query returned %d", __func__, ret); 649 *name = buffer_get_string(&m, NULL); 650 *info = buffer_get_string(&m, NULL); 651 sshpam_set_maxtries_reached(buffer_get_int(&m)); 652 *num = buffer_get_int(&m); 653 if (*num > PAM_MAX_NUM_MSG) 654 fatal("%s: recieved %u PAM messages, expected <= %u", 655 __func__, *num, PAM_MAX_NUM_MSG); 656 *prompts = xcalloc((*num + 1), sizeof(char *)); 657 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 658 for (i = 0; i < *num; ++i) { 659 (*prompts)[i] = buffer_get_string(&m, NULL); 660 (*echo_on)[i] = buffer_get_int(&m); 661 } 662 buffer_free(&m); 663 return (ret); 664 } 665 666 int 667 mm_sshpam_respond(void *ctx, u_int num, char **resp) 668 { 669 Buffer m; 670 u_int i; 671 int ret; 672 673 debug3("%s", __func__); 674 buffer_init(&m); 675 buffer_put_int(&m, num); 676 for (i = 0; i < num; ++i) 677 buffer_put_cstring(&m, resp[i]); 678 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 679 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 680 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 681 ret = buffer_get_int(&m); 682 debug3("%s: pam_respond returned %d", __func__, ret); 683 buffer_free(&m); 684 return (ret); 685 } 686 687 void 688 mm_sshpam_free_ctx(void *ctxtp) 689 { 690 Buffer m; 691 692 debug3("%s", __func__); 693 buffer_init(&m); 694 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 695 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 696 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 697 buffer_free(&m); 698 } 699 #endif /* USE_PAM */ 700 701 /* Request process termination */ 702 703 void 704 mm_terminate(void) 705 { 706 Buffer m; 707 708 buffer_init(&m); 709 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 710 buffer_free(&m); 711 } 712 713 static void 714 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 715 char ***prompts, u_int **echo_on) 716 { 717 *name = xstrdup(""); 718 *infotxt = xstrdup(""); 719 *numprompts = 1; 720 *prompts = xcalloc(*numprompts, sizeof(char *)); 721 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 722 (*echo_on)[0] = 0; 723 } 724 725 int 726 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 727 u_int *numprompts, char ***prompts, u_int **echo_on) 728 { 729 Buffer m; 730 u_int success; 731 char *challenge; 732 733 debug3("%s: entering", __func__); 734 735 buffer_init(&m); 736 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 737 738 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 739 &m); 740 success = buffer_get_int(&m); 741 if (success == 0) { 742 debug3("%s: no challenge", __func__); 743 buffer_free(&m); 744 return (-1); 745 } 746 747 /* Get the challenge, and format the response */ 748 challenge = buffer_get_string(&m, NULL); 749 buffer_free(&m); 750 751 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 752 (*prompts)[0] = challenge; 753 754 debug3("%s: received challenge: %s", __func__, challenge); 755 756 return (0); 757 } 758 759 int 760 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 761 { 762 Buffer m; 763 int authok; 764 765 debug3("%s: entering", __func__); 766 if (numresponses != 1) 767 return (-1); 768 769 buffer_init(&m); 770 buffer_put_cstring(&m, responses[0]); 771 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 772 773 mm_request_receive_expect(pmonitor->m_recvfd, 774 MONITOR_ANS_BSDAUTHRESPOND, &m); 775 776 authok = buffer_get_int(&m); 777 buffer_free(&m); 778 779 return ((authok == 0) ? -1 : 0); 780 } 781 782 #ifdef SKEY 783 int 784 mm_skey_query(void *ctx, char **name, char **infotxt, 785 u_int *numprompts, char ***prompts, u_int **echo_on) 786 { 787 Buffer m; 788 u_int success; 789 char *challenge; 790 791 debug3("%s: entering", __func__); 792 793 buffer_init(&m); 794 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 795 796 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 797 &m); 798 success = buffer_get_int(&m); 799 if (success == 0) { 800 debug3("%s: no challenge", __func__); 801 buffer_free(&m); 802 return (-1); 803 } 804 805 /* Get the challenge, and format the response */ 806 challenge = buffer_get_string(&m, NULL); 807 buffer_free(&m); 808 809 debug3("%s: received challenge: %s", __func__, challenge); 810 811 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 812 813 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); 814 free(challenge); 815 816 return (0); 817 } 818 819 int 820 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 821 { 822 Buffer m; 823 int authok; 824 825 debug3("%s: entering", __func__); 826 if (numresponses != 1) 827 return (-1); 828 829 buffer_init(&m); 830 buffer_put_cstring(&m, responses[0]); 831 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 832 833 mm_request_receive_expect(pmonitor->m_recvfd, 834 MONITOR_ANS_SKEYRESPOND, &m); 835 836 authok = buffer_get_int(&m); 837 buffer_free(&m); 838 839 return ((authok == 0) ? -1 : 0); 840 } 841 #endif /* SKEY */ 842 843 #ifdef SSH_AUDIT_EVENTS 844 void 845 mm_audit_event(ssh_audit_event_t event) 846 { 847 Buffer m; 848 849 debug3("%s entering", __func__); 850 851 buffer_init(&m); 852 buffer_put_int(&m, event); 853 854 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); 855 buffer_free(&m); 856 } 857 858 void 859 mm_audit_run_command(const char *command) 860 { 861 Buffer m; 862 863 debug3("%s entering command %s", __func__, command); 864 865 buffer_init(&m); 866 buffer_put_cstring(&m, command); 867 868 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); 869 buffer_free(&m); 870 } 871 #endif /* SSH_AUDIT_EVENTS */ 872 873 #ifdef GSSAPI 874 OM_uint32 875 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 876 { 877 Buffer m; 878 OM_uint32 major; 879 880 /* Client doesn't get to see the context */ 881 *ctx = NULL; 882 883 buffer_init(&m); 884 buffer_put_string(&m, goid->elements, goid->length); 885 886 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 887 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 888 889 major = buffer_get_int(&m); 890 891 buffer_free(&m); 892 return (major); 893 } 894 895 OM_uint32 896 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 897 gss_buffer_desc *out, OM_uint32 *flags) 898 { 899 Buffer m; 900 OM_uint32 major; 901 u_int len; 902 903 buffer_init(&m); 904 buffer_put_string(&m, in->value, in->length); 905 906 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 907 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 908 909 major = buffer_get_int(&m); 910 out->value = buffer_get_string(&m, &len); 911 out->length = len; 912 if (flags) 913 *flags = buffer_get_int(&m); 914 915 buffer_free(&m); 916 917 return (major); 918 } 919 920 OM_uint32 921 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 922 { 923 Buffer m; 924 OM_uint32 major; 925 926 buffer_init(&m); 927 buffer_put_string(&m, gssbuf->value, gssbuf->length); 928 buffer_put_string(&m, gssmic->value, gssmic->length); 929 930 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 931 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 932 &m); 933 934 major = buffer_get_int(&m); 935 buffer_free(&m); 936 return(major); 937 } 938 939 int 940 mm_ssh_gssapi_userok(char *user) 941 { 942 Buffer m; 943 int authenticated = 0; 944 945 buffer_init(&m); 946 947 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 948 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 949 &m); 950 951 authenticated = buffer_get_int(&m); 952 953 buffer_free(&m); 954 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 955 return (authenticated); 956 } 957 #endif /* GSSAPI */ 958 959