1 /* $OpenBSD: monitor_wrap.c,v 1.89 2016/08/13 17:47:41 markus Exp $ */ 2 /* 3 * Copyright 2002 Niels Provos <provos (at) citi.umich.edu> 4 * Copyright 2002 Markus Friedl <markus (at) 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(Key *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 Buffer m; 246 struct passwd *pw; 247 u_int len, i; 248 ServerOptions *newopts; 249 250 debug3("%s entering", __func__); 251 252 buffer_init(&m); 253 buffer_put_cstring(&m, username); 254 255 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 256 257 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 258 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 259 260 if (buffer_get_char(&m) == 0) { 261 pw = NULL; 262 goto out; 263 } 264 pw = buffer_get_string(&m, &len); 265 if (len != sizeof(struct passwd)) 266 fatal("%s: struct passwd size mismatch", __func__); 267 pw->pw_name = buffer_get_string(&m, NULL); 268 pw->pw_passwd = buffer_get_string(&m, NULL); 269 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 270 pw->pw_gecos = buffer_get_string(&m, NULL); 271 #endif 272 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 273 pw->pw_class = buffer_get_string(&m, NULL); 274 #endif 275 pw->pw_dir = buffer_get_string(&m, NULL); 276 pw->pw_shell = buffer_get_string(&m, NULL); 277 278 out: 279 /* copy options block as a Match directive may have changed some */ 280 newopts = buffer_get_string(&m, &len); 281 if (len != sizeof(*newopts)) 282 fatal("%s: option block size mismatch", __func__); 283 284 #define M_CP_STROPT(x) do { \ 285 if (newopts->x != NULL) \ 286 newopts->x = buffer_get_string(&m, NULL); \ 287 } while (0) 288 #define M_CP_STRARRAYOPT(x, nx) do { \ 289 for (i = 0; i < newopts->nx; i++) \ 290 newopts->x[i] = buffer_get_string(&m, NULL); \ 291 } while (0) 292 /* See comment in servconf.h */ 293 COPY_MATCH_STRING_OPTS(); 294 #undef M_CP_STROPT 295 #undef M_CP_STRARRAYOPT 296 297 copy_set_server_options(&options, newopts, 1); 298 free(newopts); 299 300 buffer_free(&m); 301 302 return (pw); 303 } 304 305 char * 306 mm_auth2_read_banner(void) 307 { 308 Buffer m; 309 char *banner; 310 311 debug3("%s entering", __func__); 312 313 buffer_init(&m); 314 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 315 buffer_clear(&m); 316 317 mm_request_receive_expect(pmonitor->m_recvfd, 318 MONITOR_ANS_AUTH2_READ_BANNER, &m); 319 banner = buffer_get_string(&m, NULL); 320 buffer_free(&m); 321 322 /* treat empty banner as missing banner */ 323 if (strlen(banner) == 0) { 324 free(banner); 325 banner = NULL; 326 } 327 return (banner); 328 } 329 330 /* Inform the privileged process about service and style */ 331 332 void 333 mm_inform_authserv(char *service, char *style) 334 { 335 Buffer m; 336 337 debug3("%s entering", __func__); 338 339 buffer_init(&m); 340 buffer_put_cstring(&m, service); 341 buffer_put_cstring(&m, style ? style : ""); 342 343 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 344 345 buffer_free(&m); 346 } 347 348 /* Do the password authentication */ 349 int 350 mm_auth_password(Authctxt *authctxt, char *password) 351 { 352 Buffer m; 353 int authenticated = 0; 354 355 debug3("%s entering", __func__); 356 357 buffer_init(&m); 358 buffer_put_cstring(&m, password); 359 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 360 361 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 362 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 363 364 authenticated = buffer_get_int(&m); 365 #ifdef USE_PAM 366 sshpam_set_maxtries_reached(buffer_get_int(&m)); 367 #endif 368 369 buffer_free(&m); 370 371 debug3("%s: user %sauthenticated", 372 __func__, authenticated ? "" : "not "); 373 return (authenticated); 374 } 375 376 int 377 mm_user_key_allowed(struct passwd *pw, Key *key, int pubkey_auth_attempt) 378 { 379 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key, 380 pubkey_auth_attempt)); 381 } 382 383 int 384 mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host, 385 Key *key) 386 { 387 return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0)); 388 } 389 390 int 391 mm_key_allowed(enum mm_keytype type, const char *user, const char *host, 392 Key *key, int pubkey_auth_attempt) 393 { 394 Buffer m; 395 u_char *blob; 396 u_int len; 397 int allowed = 0, have_forced = 0; 398 399 debug3("%s entering", __func__); 400 401 /* Convert the key to a blob and the pass it over */ 402 if (!key_to_blob(key, &blob, &len)) 403 return (0); 404 405 buffer_init(&m); 406 buffer_put_int(&m, type); 407 buffer_put_cstring(&m, user ? user : ""); 408 buffer_put_cstring(&m, host ? host : ""); 409 buffer_put_string(&m, blob, len); 410 buffer_put_int(&m, pubkey_auth_attempt); 411 free(blob); 412 413 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 414 415 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 416 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); 417 418 allowed = buffer_get_int(&m); 419 420 /* fake forced command */ 421 auth_clear_options(); 422 have_forced = buffer_get_int(&m); 423 forced_command = have_forced ? xstrdup("true") : NULL; 424 425 buffer_free(&m); 426 427 return (allowed); 428 } 429 430 /* 431 * This key verify needs to send the key type along, because the 432 * privileged parent makes the decision if the key is allowed 433 * for authentication. 434 */ 435 436 int 437 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) 438 { 439 Buffer m; 440 u_char *blob; 441 u_int len; 442 int verified = 0; 443 444 debug3("%s entering", __func__); 445 446 /* Convert the key to a blob and the pass it over */ 447 if (!key_to_blob(key, &blob, &len)) 448 return (0); 449 450 buffer_init(&m); 451 buffer_put_string(&m, blob, len); 452 buffer_put_string(&m, sig, siglen); 453 buffer_put_string(&m, data, datalen); 454 free(blob); 455 456 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 457 458 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 459 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 460 461 verified = buffer_get_int(&m); 462 463 buffer_free(&m); 464 465 return (verified); 466 } 467 468 void 469 mm_send_keystate(struct monitor *monitor) 470 { 471 struct ssh *ssh = active_state; /* XXX */ 472 struct sshbuf *m; 473 int r; 474 475 if ((m = sshbuf_new()) == NULL) 476 fatal("%s: sshbuf_new failed", __func__); 477 if ((r = ssh_packet_get_state(ssh, m)) != 0) 478 fatal("%s: get_state failed: %s", 479 __func__, ssh_err(r)); 480 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m); 481 debug3("%s: Finished sending state", __func__); 482 sshbuf_free(m); 483 } 484 485 int 486 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 487 { 488 Buffer m; 489 char *p, *msg; 490 int success = 0, tmp1 = -1, tmp2 = -1; 491 492 /* Kludge: ensure there are fds free to receive the pty/tty */ 493 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 494 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 495 error("%s: cannot allocate fds for pty", __func__); 496 if (tmp1 > 0) 497 close(tmp1); 498 if (tmp2 > 0) 499 close(tmp2); 500 return 0; 501 } 502 close(tmp1); 503 close(tmp2); 504 505 buffer_init(&m); 506 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 507 508 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 509 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 510 511 success = buffer_get_int(&m); 512 if (success == 0) { 513 debug3("%s: pty alloc failed", __func__); 514 buffer_free(&m); 515 return (0); 516 } 517 p = buffer_get_string(&m, NULL); 518 msg = buffer_get_string(&m, NULL); 519 buffer_free(&m); 520 521 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 522 free(p); 523 524 buffer_append(&loginmsg, msg, strlen(msg)); 525 free(msg); 526 527 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 528 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 529 fatal("%s: receive fds failed", __func__); 530 531 /* Success */ 532 return (1); 533 } 534 535 void 536 mm_session_pty_cleanup2(Session *s) 537 { 538 Buffer m; 539 540 if (s->ttyfd == -1) 541 return; 542 buffer_init(&m); 543 buffer_put_cstring(&m, s->tty); 544 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 545 buffer_free(&m); 546 547 /* closed dup'ed master */ 548 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 549 error("close(s->ptymaster/%d): %s", 550 s->ptymaster, strerror(errno)); 551 552 /* unlink pty from session */ 553 s->ttyfd = -1; 554 } 555 556 #ifdef USE_PAM 557 void 558 mm_start_pam(Authctxt *authctxt) 559 { 560 Buffer m; 561 562 debug3("%s entering", __func__); 563 if (!options.use_pam) 564 fatal("UsePAM=no, but ended up in %s anyway", __func__); 565 566 buffer_init(&m); 567 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 568 569 buffer_free(&m); 570 } 571 572 u_int 573 mm_do_pam_account(void) 574 { 575 Buffer m; 576 u_int ret; 577 char *msg; 578 579 debug3("%s entering", __func__); 580 if (!options.use_pam) 581 fatal("UsePAM=no, but ended up in %s anyway", __func__); 582 583 buffer_init(&m); 584 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 585 586 mm_request_receive_expect(pmonitor->m_recvfd, 587 MONITOR_ANS_PAM_ACCOUNT, &m); 588 ret = buffer_get_int(&m); 589 msg = buffer_get_string(&m, NULL); 590 buffer_append(&loginmsg, msg, strlen(msg)); 591 free(msg); 592 593 buffer_free(&m); 594 595 debug3("%s returning %d", __func__, ret); 596 597 return (ret); 598 } 599 600 void * 601 mm_sshpam_init_ctx(Authctxt *authctxt) 602 { 603 Buffer m; 604 int success; 605 606 debug3("%s", __func__); 607 buffer_init(&m); 608 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 609 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 610 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 611 success = buffer_get_int(&m); 612 if (success == 0) { 613 debug3("%s: pam_init_ctx failed", __func__); 614 buffer_free(&m); 615 return (NULL); 616 } 617 buffer_free(&m); 618 return (authctxt); 619 } 620 621 int 622 mm_sshpam_query(void *ctx, char **name, char **info, 623 u_int *num, char ***prompts, u_int **echo_on) 624 { 625 Buffer m; 626 u_int i; 627 int ret; 628 629 debug3("%s", __func__); 630 buffer_init(&m); 631 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 632 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 633 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 634 ret = buffer_get_int(&m); 635 debug3("%s: pam_query returned %d", __func__, ret); 636 *name = buffer_get_string(&m, NULL); 637 *info = buffer_get_string(&m, NULL); 638 sshpam_set_maxtries_reached(buffer_get_int(&m)); 639 *num = buffer_get_int(&m); 640 if (*num > PAM_MAX_NUM_MSG) 641 fatal("%s: recieved %u PAM messages, expected <= %u", 642 __func__, *num, PAM_MAX_NUM_MSG); 643 *prompts = xcalloc((*num + 1), sizeof(char *)); 644 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 645 for (i = 0; i < *num; ++i) { 646 (*prompts)[i] = buffer_get_string(&m, NULL); 647 (*echo_on)[i] = buffer_get_int(&m); 648 } 649 buffer_free(&m); 650 return (ret); 651 } 652 653 int 654 mm_sshpam_respond(void *ctx, u_int num, char **resp) 655 { 656 Buffer m; 657 u_int i; 658 int ret; 659 660 debug3("%s", __func__); 661 buffer_init(&m); 662 buffer_put_int(&m, num); 663 for (i = 0; i < num; ++i) 664 buffer_put_cstring(&m, resp[i]); 665 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 666 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 667 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 668 ret = buffer_get_int(&m); 669 debug3("%s: pam_respond returned %d", __func__, ret); 670 buffer_free(&m); 671 return (ret); 672 } 673 674 void 675 mm_sshpam_free_ctx(void *ctxtp) 676 { 677 Buffer m; 678 679 debug3("%s", __func__); 680 buffer_init(&m); 681 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 682 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 683 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 684 buffer_free(&m); 685 } 686 #endif /* USE_PAM */ 687 688 /* Request process termination */ 689 690 void 691 mm_terminate(void) 692 { 693 Buffer m; 694 695 buffer_init(&m); 696 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 697 buffer_free(&m); 698 } 699 700 static void 701 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 702 char ***prompts, u_int **echo_on) 703 { 704 *name = xstrdup(""); 705 *infotxt = xstrdup(""); 706 *numprompts = 1; 707 *prompts = xcalloc(*numprompts, sizeof(char *)); 708 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 709 (*echo_on)[0] = 0; 710 } 711 712 int 713 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 714 u_int *numprompts, char ***prompts, u_int **echo_on) 715 { 716 Buffer m; 717 u_int success; 718 char *challenge; 719 720 debug3("%s: entering", __func__); 721 722 buffer_init(&m); 723 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 724 725 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 726 &m); 727 success = buffer_get_int(&m); 728 if (success == 0) { 729 debug3("%s: no challenge", __func__); 730 buffer_free(&m); 731 return (-1); 732 } 733 734 /* Get the challenge, and format the response */ 735 challenge = buffer_get_string(&m, NULL); 736 buffer_free(&m); 737 738 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 739 (*prompts)[0] = challenge; 740 741 debug3("%s: received challenge: %s", __func__, challenge); 742 743 return (0); 744 } 745 746 int 747 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 748 { 749 Buffer m; 750 int authok; 751 752 debug3("%s: entering", __func__); 753 if (numresponses != 1) 754 return (-1); 755 756 buffer_init(&m); 757 buffer_put_cstring(&m, responses[0]); 758 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 759 760 mm_request_receive_expect(pmonitor->m_recvfd, 761 MONITOR_ANS_BSDAUTHRESPOND, &m); 762 763 authok = buffer_get_int(&m); 764 buffer_free(&m); 765 766 return ((authok == 0) ? -1 : 0); 767 } 768 769 #ifdef SKEY 770 int 771 mm_skey_query(void *ctx, char **name, char **infotxt, 772 u_int *numprompts, char ***prompts, u_int **echo_on) 773 { 774 Buffer m; 775 u_int success; 776 char *challenge; 777 778 debug3("%s: entering", __func__); 779 780 buffer_init(&m); 781 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 782 783 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 784 &m); 785 success = buffer_get_int(&m); 786 if (success == 0) { 787 debug3("%s: no challenge", __func__); 788 buffer_free(&m); 789 return (-1); 790 } 791 792 /* Get the challenge, and format the response */ 793 challenge = buffer_get_string(&m, NULL); 794 buffer_free(&m); 795 796 debug3("%s: received challenge: %s", __func__, challenge); 797 798 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 799 800 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); 801 free(challenge); 802 803 return (0); 804 } 805 806 int 807 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 808 { 809 Buffer m; 810 int authok; 811 812 debug3("%s: entering", __func__); 813 if (numresponses != 1) 814 return (-1); 815 816 buffer_init(&m); 817 buffer_put_cstring(&m, responses[0]); 818 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 819 820 mm_request_receive_expect(pmonitor->m_recvfd, 821 MONITOR_ANS_SKEYRESPOND, &m); 822 823 authok = buffer_get_int(&m); 824 buffer_free(&m); 825 826 return ((authok == 0) ? -1 : 0); 827 } 828 #endif /* SKEY */ 829 830 #ifdef SSH_AUDIT_EVENTS 831 void 832 mm_audit_event(ssh_audit_event_t event) 833 { 834 Buffer m; 835 836 debug3("%s entering", __func__); 837 838 buffer_init(&m); 839 buffer_put_int(&m, event); 840 841 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); 842 buffer_free(&m); 843 } 844 845 void 846 mm_audit_run_command(const char *command) 847 { 848 Buffer m; 849 850 debug3("%s entering command %s", __func__, command); 851 852 buffer_init(&m); 853 buffer_put_cstring(&m, command); 854 855 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); 856 buffer_free(&m); 857 } 858 #endif /* SSH_AUDIT_EVENTS */ 859 860 #ifdef GSSAPI 861 OM_uint32 862 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 863 { 864 Buffer m; 865 OM_uint32 major; 866 867 /* Client doesn't get to see the context */ 868 *ctx = NULL; 869 870 buffer_init(&m); 871 buffer_put_string(&m, goid->elements, goid->length); 872 873 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 874 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 875 876 major = buffer_get_int(&m); 877 878 buffer_free(&m); 879 return (major); 880 } 881 882 OM_uint32 883 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 884 gss_buffer_desc *out, OM_uint32 *flags) 885 { 886 Buffer m; 887 OM_uint32 major; 888 u_int len; 889 890 buffer_init(&m); 891 buffer_put_string(&m, in->value, in->length); 892 893 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 894 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 895 896 major = buffer_get_int(&m); 897 out->value = buffer_get_string(&m, &len); 898 out->length = len; 899 if (flags) 900 *flags = buffer_get_int(&m); 901 902 buffer_free(&m); 903 904 return (major); 905 } 906 907 OM_uint32 908 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 909 { 910 Buffer m; 911 OM_uint32 major; 912 913 buffer_init(&m); 914 buffer_put_string(&m, gssbuf->value, gssbuf->length); 915 buffer_put_string(&m, gssmic->value, gssmic->length); 916 917 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 918 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 919 &m); 920 921 major = buffer_get_int(&m); 922 buffer_free(&m); 923 return(major); 924 } 925 926 int 927 mm_ssh_gssapi_userok(char *user) 928 { 929 Buffer m; 930 int authenticated = 0; 931 932 buffer_init(&m); 933 934 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 935 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 936 &m); 937 938 authenticated = buffer_get_int(&m); 939 940 buffer_free(&m); 941 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 942 return (authenticated); 943 } 944 #endif /* GSSAPI */ 945 946
