1 /* $OpenBSD: monitor_wrap.c,v 1.99 2018/03/03 03:15:51 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 80 #include "channels.h" 81 #include "session.h" 82 #include "servconf.h" 83 84 #include "ssherr.h" 85 86 /* Imports */ 87 extern z_stream incoming_stream; 88 extern z_stream outgoing_stream; 89 extern struct monitor *pmonitor; 90 extern Buffer loginmsg; 91 extern ServerOptions options; 92 93 void 94 mm_log_handler(LogLevel level, const char *msg, void *ctx) 95 { 96 Buffer log_msg; 97 struct monitor *mon = (struct monitor *)ctx; 98 99 if (mon->m_log_sendfd == -1) 100 fatal("%s: no log channel", __func__); 101 102 buffer_init(&log_msg); 103 /* 104 * Placeholder for packet length. Will be filled in with the actual 105 * packet length once the packet has been constucted. This saves 106 * fragile math. 107 */ 108 buffer_put_int(&log_msg, 0); 109 110 buffer_put_int(&log_msg, level); 111 buffer_put_cstring(&log_msg, msg); 112 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); 113 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), 114 buffer_len(&log_msg)) != buffer_len(&log_msg)) 115 fatal("%s: write: %s", __func__, strerror(errno)); 116 buffer_free(&log_msg); 117 } 118 119 int 120 mm_is_monitor(void) 121 { 122 /* 123 * m_pid is only set in the privileged part, and 124 * points to the unprivileged child. 125 */ 126 return (pmonitor && pmonitor->m_pid > 0); 127 } 128 129 void 130 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 131 { 132 u_int mlen = buffer_len(m); 133 u_char buf[5]; 134 135 debug3("%s entering: type %d", __func__, type); 136 137 put_u32(buf, mlen + 1); 138 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 139 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 140 fatal("%s: write: %s", __func__, strerror(errno)); 141 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 142 fatal("%s: write: %s", __func__, strerror(errno)); 143 } 144 145 void 146 mm_request_receive(int sock, Buffer *m) 147 { 148 u_char buf[4]; 149 u_int msg_len; 150 151 debug3("%s entering", __func__); 152 153 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 154 if (errno == EPIPE) 155 cleanup_exit(255); 156 fatal("%s: read: %s", __func__, strerror(errno)); 157 } 158 msg_len = get_u32(buf); 159 if (msg_len > 256 * 1024) 160 fatal("%s: read: bad msg_len %d", __func__, msg_len); 161 buffer_clear(m); 162 buffer_append_space(m, msg_len); 163 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 164 fatal("%s: read: %s", __func__, strerror(errno)); 165 } 166 167 void 168 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 169 { 170 u_char rtype; 171 172 debug3("%s entering: type %d", __func__, type); 173 174 mm_request_receive(sock, m); 175 rtype = buffer_get_char(m); 176 if (rtype != type) 177 fatal("%s: read: rtype %d != type %d", __func__, 178 rtype, type); 179 } 180 181 #ifdef WITH_OPENSSL 182 DH * 183 mm_choose_dh(int min, int nbits, int max) 184 { 185 BIGNUM *p, *g; 186 int success = 0; 187 Buffer m; 188 189 buffer_init(&m); 190 buffer_put_int(&m, min); 191 buffer_put_int(&m, nbits); 192 buffer_put_int(&m, max); 193 194 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 195 196 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 197 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 198 199 success = buffer_get_char(&m); 200 if (success == 0) 201 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 202 203 if ((p = BN_new()) == NULL) 204 fatal("%s: BN_new failed", __func__); 205 if ((g = BN_new()) == NULL) 206 fatal("%s: BN_new failed", __func__); 207 buffer_get_bignum2(&m, p); 208 buffer_get_bignum2(&m, g); 209 210 debug3("%s: remaining %d", __func__, buffer_len(&m)); 211 buffer_free(&m); 212 213 return (dh_new_group(g, p)); 214 } 215 #endif 216 217 int 218 mm_key_sign(struct sshkey *key, u_char **sigp, u_int *lenp, 219 const u_char *data, u_int datalen, const char *hostkey_alg) 220 { 221 struct kex *kex = *pmonitor->m_pkex; 222 Buffer m; 223 224 debug3("%s entering", __func__); 225 226 buffer_init(&m); 227 buffer_put_int(&m, kex->host_key_index(key, 0, active_state)); 228 buffer_put_string(&m, data, datalen); 229 buffer_put_cstring(&m, hostkey_alg); 230 231 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 232 233 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 234 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 235 *sigp = buffer_get_string(&m, lenp); 236 buffer_free(&m); 237 238 return (0); 239 } 240 241 struct passwd * 242 mm_getpwnamallow(const char *username) 243 { 244 struct ssh *ssh = active_state; /* XXX */ 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 newopts->x = newopts->nx == 0 ? \ 290 NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \ 291 for (i = 0; i < newopts->nx; i++) \ 292 newopts->x[i] = buffer_get_string(&m, NULL); \ 293 } while (0) 294 /* See comment in servconf.h */ 295 COPY_MATCH_STRING_OPTS(); 296 #undef M_CP_STROPT 297 #undef M_CP_STRARRAYOPT 298 299 copy_set_server_options(&options, newopts, 1); 300 log_change_level(options.log_level); 301 process_permitopen(ssh, &options); 302 free(newopts); 303 304 buffer_free(&m); 305 306 return (pw); 307 } 308 309 char * 310 mm_auth2_read_banner(void) 311 { 312 Buffer m; 313 char *banner; 314 315 debug3("%s entering", __func__); 316 317 buffer_init(&m); 318 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 319 buffer_clear(&m); 320 321 mm_request_receive_expect(pmonitor->m_recvfd, 322 MONITOR_ANS_AUTH2_READ_BANNER, &m); 323 banner = buffer_get_string(&m, NULL); 324 buffer_free(&m); 325 326 /* treat empty banner as missing banner */ 327 if (strlen(banner) == 0) { 328 free(banner); 329 banner = NULL; 330 } 331 return (banner); 332 } 333 334 /* Inform the privileged process about service and style */ 335 336 void 337 mm_inform_authserv(char *service, char *style) 338 { 339 Buffer m; 340 341 debug3("%s entering", __func__); 342 343 buffer_init(&m); 344 buffer_put_cstring(&m, service); 345 buffer_put_cstring(&m, style ? style : ""); 346 347 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 348 349 buffer_free(&m); 350 } 351 352 /* Do the password authentication */ 353 int 354 mm_auth_password(struct ssh *ssh, char *password) 355 { 356 Buffer m; 357 int authenticated = 0; 358 359 debug3("%s entering", __func__); 360 361 buffer_init(&m); 362 buffer_put_cstring(&m, password); 363 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 364 365 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 366 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 367 368 authenticated = buffer_get_int(&m); 369 #ifdef USE_PAM 370 sshpam_set_maxtries_reached(buffer_get_int(&m)); 371 #endif 372 373 buffer_free(&m); 374 375 debug3("%s: user %sauthenticated", 376 __func__, authenticated ? "" : "not "); 377 return (authenticated); 378 } 379 380 int 381 mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key, 382 int pubkey_auth_attempt, struct sshauthopt **authoptp) 383 { 384 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key, 385 pubkey_auth_attempt, authoptp)); 386 } 387 388 int 389 mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host, 390 struct sshkey *key) 391 { 392 return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL)); 393 } 394 395 int 396 mm_key_allowed(enum mm_keytype type, const char *user, const char *host, 397 struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp) 398 { 399 Buffer m; 400 u_char *blob; 401 u_int len; 402 int r, allowed = 0; 403 struct sshauthopt *opts = NULL; 404 405 debug3("%s entering", __func__); 406 407 if (authoptp != NULL) 408 *authoptp = NULL; 409 410 /* Convert the key to a blob and the pass it over */ 411 if (!key_to_blob(key, &blob, &len)) 412 return 0; 413 414 buffer_init(&m); 415 buffer_put_int(&m, type); 416 buffer_put_cstring(&m, user ? user : ""); 417 buffer_put_cstring(&m, host ? host : ""); 418 buffer_put_string(&m, blob, len); 419 buffer_put_int(&m, pubkey_auth_attempt); 420 free(blob); 421 422 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 423 424 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 425 mm_request_receive_expect(pmonitor->m_recvfd, 426 MONITOR_ANS_KEYALLOWED, &m); 427 428 allowed = buffer_get_int(&m); 429 if (allowed && type == MM_USERKEY) { 430 if ((r = sshauthopt_deserialise(&m, &opts)) != 0) 431 fatal("%s: sshauthopt_deserialise: %s", 432 __func__, ssh_err(r)); 433 } 434 buffer_free(&m); 435 436 if (authoptp != NULL) { 437 *authoptp = opts; 438 opts = NULL; 439 } 440 sshauthopt_free(opts); 441 442 return allowed; 443 } 444 445 /* 446 * This key verify needs to send the key type along, because the 447 * privileged parent makes the decision if the key is allowed 448 * for authentication. 449 */ 450 451 int 452 mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen, 453 const u_char *data, size_t datalen, const char *sigalg, u_int compat) 454 { 455 Buffer m; 456 u_char *blob; 457 u_int len; 458 u_int encoded_ret = 0; 459 460 debug3("%s entering", __func__); 461 462 /* Convert the key to a blob and the pass it over */ 463 if (!key_to_blob(key, &blob, &len)) 464 return (0); 465 466 buffer_init(&m); 467 buffer_put_string(&m, blob, len); 468 buffer_put_string(&m, sig, siglen); 469 buffer_put_string(&m, data, datalen); 470 buffer_put_cstring(&m, sigalg == NULL ? "" : sigalg); 471 free(blob); 472 473 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 474 475 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 476 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 477 478 encoded_ret = buffer_get_int(&m); 479 480 buffer_free(&m); 481 482 if (encoded_ret != 0) 483 return SSH_ERR_SIGNATURE_INVALID; 484 return 0; 485 } 486 487 void 488 mm_send_keystate(struct monitor *monitor) 489 { 490 struct ssh *ssh = active_state; /* XXX */ 491 struct sshbuf *m; 492 int r; 493 494 if ((m = sshbuf_new()) == NULL) 495 fatal("%s: sshbuf_new failed", __func__); 496 if ((r = ssh_packet_get_state(ssh, m)) != 0) 497 fatal("%s: get_state failed: %s", 498 __func__, ssh_err(r)); 499 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m); 500 debug3("%s: Finished sending state", __func__); 501 sshbuf_free(m); 502 } 503 504 int 505 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 506 { 507 Buffer m; 508 char *p, *msg; 509 int success = 0, tmp1 = -1, tmp2 = -1; 510 511 /* Kludge: ensure there are fds free to receive the pty/tty */ 512 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 513 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 514 error("%s: cannot allocate fds for pty", __func__); 515 if (tmp1 > 0) 516 close(tmp1); 517 if (tmp2 > 0) 518 close(tmp2); 519 return 0; 520 } 521 close(tmp1); 522 close(tmp2); 523 524 buffer_init(&m); 525 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 526 527 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 528 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 529 530 success = buffer_get_int(&m); 531 if (success == 0) { 532 debug3("%s: pty alloc failed", __func__); 533 buffer_free(&m); 534 return (0); 535 } 536 p = buffer_get_string(&m, NULL); 537 msg = buffer_get_string(&m, NULL); 538 buffer_free(&m); 539 540 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 541 free(p); 542 543 buffer_append(&loginmsg, msg, strlen(msg)); 544 free(msg); 545 546 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 547 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 548 fatal("%s: receive fds failed", __func__); 549 550 /* Success */ 551 return (1); 552 } 553 554 void 555 mm_session_pty_cleanup2(Session *s) 556 { 557 Buffer m; 558 559 if (s->ttyfd == -1) 560 return; 561 buffer_init(&m); 562 buffer_put_cstring(&m, s->tty); 563 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 564 buffer_free(&m); 565 566 /* closed dup'ed master */ 567 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 568 error("close(s->ptymaster/%d): %s", 569 s->ptymaster, strerror(errno)); 570 571 /* unlink pty from session */ 572 s->ttyfd = -1; 573 } 574 575 #ifdef USE_PAM 576 void 577 mm_start_pam(Authctxt *authctxt) 578 { 579 Buffer m; 580 581 debug3("%s entering", __func__); 582 if (!options.use_pam) 583 fatal("UsePAM=no, but ended up in %s anyway", __func__); 584 585 buffer_init(&m); 586 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 587 588 buffer_free(&m); 589 } 590 591 u_int 592 mm_do_pam_account(void) 593 { 594 Buffer m; 595 u_int ret; 596 char *msg; 597 598 debug3("%s entering", __func__); 599 if (!options.use_pam) 600 fatal("UsePAM=no, but ended up in %s anyway", __func__); 601 602 buffer_init(&m); 603 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 604 605 mm_request_receive_expect(pmonitor->m_recvfd, 606 MONITOR_ANS_PAM_ACCOUNT, &m); 607 ret = buffer_get_int(&m); 608 msg = buffer_get_string(&m, NULL); 609 buffer_append(&loginmsg, msg, strlen(msg)); 610 free(msg); 611 612 buffer_free(&m); 613 614 debug3("%s returning %d", __func__, ret); 615 616 return (ret); 617 } 618 619 void * 620 mm_sshpam_init_ctx(Authctxt *authctxt) 621 { 622 Buffer m; 623 int success; 624 625 debug3("%s", __func__); 626 buffer_init(&m); 627 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 628 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 629 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 630 success = buffer_get_int(&m); 631 if (success == 0) { 632 debug3("%s: pam_init_ctx failed", __func__); 633 buffer_free(&m); 634 return (NULL); 635 } 636 buffer_free(&m); 637 return (authctxt); 638 } 639 640 int 641 mm_sshpam_query(void *ctx, char **name, char **info, 642 u_int *num, char ***prompts, u_int **echo_on) 643 { 644 Buffer m; 645 u_int i; 646 int ret; 647 648 debug3("%s", __func__); 649 buffer_init(&m); 650 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 651 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 652 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 653 ret = buffer_get_int(&m); 654 debug3("%s: pam_query returned %d", __func__, ret); 655 *name = buffer_get_string(&m, NULL); 656 *info = buffer_get_string(&m, NULL); 657 sshpam_set_maxtries_reached(buffer_get_int(&m)); 658 *num = buffer_get_int(&m); 659 if (*num > PAM_MAX_NUM_MSG) 660 fatal("%s: recieved %u PAM messages, expected <= %u", 661 __func__, *num, PAM_MAX_NUM_MSG); 662 *prompts = xcalloc((*num + 1), sizeof(char *)); 663 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 664 for (i = 0; i < *num; ++i) { 665 (*prompts)[i] = buffer_get_string(&m, NULL); 666 (*echo_on)[i] = buffer_get_int(&m); 667 } 668 buffer_free(&m); 669 return (ret); 670 } 671 672 int 673 mm_sshpam_respond(void *ctx, u_int num, char **resp) 674 { 675 Buffer m; 676 u_int i; 677 int ret; 678 679 debug3("%s", __func__); 680 buffer_init(&m); 681 buffer_put_int(&m, num); 682 for (i = 0; i < num; ++i) 683 buffer_put_cstring(&m, resp[i]); 684 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 685 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 686 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 687 ret = buffer_get_int(&m); 688 debug3("%s: pam_respond returned %d", __func__, ret); 689 buffer_free(&m); 690 return (ret); 691 } 692 693 void 694 mm_sshpam_free_ctx(void *ctxtp) 695 { 696 Buffer m; 697 698 debug3("%s", __func__); 699 buffer_init(&m); 700 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 701 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 702 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 703 buffer_free(&m); 704 } 705 #endif /* USE_PAM */ 706 707 /* Request process termination */ 708 709 void 710 mm_terminate(void) 711 { 712 Buffer m; 713 714 buffer_init(&m); 715 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 716 buffer_free(&m); 717 } 718 719 static void 720 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 721 char ***prompts, u_int **echo_on) 722 { 723 *name = xstrdup(""); 724 *infotxt = xstrdup(""); 725 *numprompts = 1; 726 *prompts = xcalloc(*numprompts, sizeof(char *)); 727 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 728 (*echo_on)[0] = 0; 729 } 730 731 int 732 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 733 u_int *numprompts, char ***prompts, u_int **echo_on) 734 { 735 Buffer m; 736 u_int success; 737 char *challenge; 738 739 debug3("%s: entering", __func__); 740 741 buffer_init(&m); 742 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 743 744 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 745 &m); 746 success = buffer_get_int(&m); 747 if (success == 0) { 748 debug3("%s: no challenge", __func__); 749 buffer_free(&m); 750 return (-1); 751 } 752 753 /* Get the challenge, and format the response */ 754 challenge = buffer_get_string(&m, NULL); 755 buffer_free(&m); 756 757 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 758 (*prompts)[0] = challenge; 759 760 debug3("%s: received challenge: %s", __func__, challenge); 761 762 return (0); 763 } 764 765 int 766 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 767 { 768 Buffer m; 769 int authok; 770 771 debug3("%s: entering", __func__); 772 if (numresponses != 1) 773 return (-1); 774 775 buffer_init(&m); 776 buffer_put_cstring(&m, responses[0]); 777 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 778 779 mm_request_receive_expect(pmonitor->m_recvfd, 780 MONITOR_ANS_BSDAUTHRESPOND, &m); 781 782 authok = buffer_get_int(&m); 783 buffer_free(&m); 784 785 return ((authok == 0) ? -1 : 0); 786 } 787 788 #ifdef SKEY 789 int 790 mm_skey_query(void *ctx, char **name, char **infotxt, 791 u_int *numprompts, char ***prompts, u_int **echo_on) 792 { 793 Buffer m; 794 u_int success; 795 char *challenge; 796 797 debug3("%s: entering", __func__); 798 799 buffer_init(&m); 800 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 801 802 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 803 &m); 804 success = buffer_get_int(&m); 805 if (success == 0) { 806 debug3("%s: no challenge", __func__); 807 buffer_free(&m); 808 return (-1); 809 } 810 811 /* Get the challenge, and format the response */ 812 challenge = buffer_get_string(&m, NULL); 813 buffer_free(&m); 814 815 debug3("%s: received challenge: %s", __func__, challenge); 816 817 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 818 819 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); 820 free(challenge); 821 822 return (0); 823 } 824 825 int 826 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 827 { 828 Buffer m; 829 int authok; 830 831 debug3("%s: entering", __func__); 832 if (numresponses != 1) 833 return (-1); 834 835 buffer_init(&m); 836 buffer_put_cstring(&m, responses[0]); 837 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 838 839 mm_request_receive_expect(pmonitor->m_recvfd, 840 MONITOR_ANS_SKEYRESPOND, &m); 841 842 authok = buffer_get_int(&m); 843 buffer_free(&m); 844 845 return ((authok == 0) ? -1 : 0); 846 } 847 #endif /* SKEY */ 848 849 #ifdef SSH_AUDIT_EVENTS 850 void 851 mm_audit_event(ssh_audit_event_t event) 852 { 853 Buffer m; 854 855 debug3("%s entering", __func__); 856 857 buffer_init(&m); 858 buffer_put_int(&m, event); 859 860 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); 861 buffer_free(&m); 862 } 863 864 void 865 mm_audit_run_command(const char *command) 866 { 867 Buffer m; 868 869 debug3("%s entering command %s", __func__, command); 870 871 buffer_init(&m); 872 buffer_put_cstring(&m, command); 873 874 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); 875 buffer_free(&m); 876 } 877 #endif /* SSH_AUDIT_EVENTS */ 878 879 #ifdef GSSAPI 880 OM_uint32 881 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 882 { 883 Buffer m; 884 OM_uint32 major; 885 886 /* Client doesn't get to see the context */ 887 *ctx = NULL; 888 889 buffer_init(&m); 890 buffer_put_string(&m, goid->elements, goid->length); 891 892 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 893 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 894 895 major = buffer_get_int(&m); 896 897 buffer_free(&m); 898 return (major); 899 } 900 901 OM_uint32 902 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 903 gss_buffer_desc *out, OM_uint32 *flags) 904 { 905 Buffer m; 906 OM_uint32 major; 907 u_int len; 908 909 buffer_init(&m); 910 buffer_put_string(&m, in->value, in->length); 911 912 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 913 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 914 915 major = buffer_get_int(&m); 916 out->value = buffer_get_string(&m, &len); 917 out->length = len; 918 if (flags) 919 *flags = buffer_get_int(&m); 920 921 buffer_free(&m); 922 923 return (major); 924 } 925 926 OM_uint32 927 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 928 { 929 Buffer m; 930 OM_uint32 major; 931 932 buffer_init(&m); 933 buffer_put_string(&m, gssbuf->value, gssbuf->length); 934 buffer_put_string(&m, gssmic->value, gssmic->length); 935 936 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 937 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 938 &m); 939 940 major = buffer_get_int(&m); 941 buffer_free(&m); 942 return(major); 943 } 944 945 int 946 mm_ssh_gssapi_userok(char *user) 947 { 948 Buffer m; 949 int authenticated = 0; 950 951 buffer_init(&m); 952 953 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 954 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 955 &m); 956 957 authenticated = buffer_get_int(&m); 958 959 buffer_free(&m); 960 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 961 return (authenticated); 962 } 963 #endif /* GSSAPI */ 964 965