1 /* $NetBSD: monitor_wrap.c,v 1.19 2018/04/06 18:59:00 christos Exp $ */ 2 /* $OpenBSD: monitor_wrap.c,v 1.99 2018/03/03 03:15:51 djm Exp $ */ 3 /* 4 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 5 * Copyright 2002 Markus Friedl <markus@openbsd.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "includes.h" 30 __RCSID("$NetBSD: monitor_wrap.c,v 1.19 2018/04/06 18:59:00 christos Exp $"); 31 #include <sys/types.h> 32 #include <sys/uio.h> 33 #include <sys/queue.h> 34 35 #include <errno.h> 36 #include <pwd.h> 37 #include <signal.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 #ifdef WITH_OPENSSL 43 #include <openssl/bn.h> 44 #include <openssl/dh.h> 45 #endif 46 47 #include "xmalloc.h" 48 #include "ssh.h" 49 #ifdef WITH_OPENSSL 50 #include "dh.h" 51 #endif 52 #include "buffer.h" 53 #include "key.h" 54 #include "cipher.h" 55 #include "kex.h" 56 #include "hostfile.h" 57 #include "auth.h" 58 #include "auth-options.h" 59 #include "packet.h" 60 #include "mac.h" 61 #include "log.h" 62 #include <zlib.h> 63 #include "monitor.h" 64 #ifdef GSSAPI 65 #include "ssh-gss.h" 66 #endif 67 #include "monitor_wrap.h" 68 #include "atomicio.h" 69 #include "monitor_fdpass.h" 70 #ifdef USE_PAM 71 #include "misc.h" 72 #include "servconf.h" 73 #include <security/pam_appl.h> 74 #endif 75 #include "misc.h" 76 77 #include "channels.h" 78 #include "session.h" 79 #include "servconf.h" 80 81 #include "ssherr.h" 82 83 /* Imports */ 84 extern z_stream incoming_stream; 85 extern z_stream outgoing_stream; 86 extern struct monitor *pmonitor; 87 extern Buffer loginmsg; 88 extern ServerOptions options; 89 90 void 91 mm_log_handler(LogLevel level, const char *msg, void *ctx) 92 { 93 Buffer log_msg; 94 struct monitor *mon = (struct monitor *)ctx; 95 96 if (mon->m_log_sendfd == -1) 97 fatal("%s: no log channel", __func__); 98 99 buffer_init(&log_msg); 100 /* 101 * Placeholder for packet length. Will be filled in with the actual 102 * packet length once the packet has been constucted. This saves 103 * fragile math. 104 */ 105 buffer_put_int(&log_msg, 0); 106 107 buffer_put_int(&log_msg, level); 108 buffer_put_cstring(&log_msg, msg); 109 put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); 110 if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), 111 buffer_len(&log_msg)) != buffer_len(&log_msg)) 112 fatal("%s: write: %s", __func__, strerror(errno)); 113 buffer_free(&log_msg); 114 } 115 116 int 117 mm_is_monitor(void) 118 { 119 /* 120 * m_pid is only set in the privileged part, and 121 * points to the unprivileged child. 122 */ 123 return (pmonitor && pmonitor->m_pid > 0); 124 } 125 126 void 127 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) 128 { 129 u_int mlen = buffer_len(m); 130 u_char buf[5]; 131 132 debug3("%s entering: type %d", __func__, type); 133 134 put_u32(buf, mlen + 1); 135 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 136 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 137 fatal("%s: write: %s", __func__, strerror(errno)); 138 if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) 139 fatal("%s: write: %s", __func__, strerror(errno)); 140 } 141 142 void 143 mm_request_receive(int sock, Buffer *m) 144 { 145 u_char buf[4]; 146 u_int msg_len; 147 148 debug3("%s entering", __func__); 149 150 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 151 if (errno == EPIPE) 152 cleanup_exit(255); 153 fatal("%s: read: %s", __func__, strerror(errno)); 154 } 155 msg_len = get_u32(buf); 156 if (msg_len > 256 * 1024) 157 fatal("%s: read: bad msg_len %d", __func__, msg_len); 158 buffer_clear(m); 159 buffer_append_space(m, msg_len); 160 if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) 161 fatal("%s: read: %s", __func__, strerror(errno)); 162 } 163 164 void 165 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) 166 { 167 u_char rtype; 168 169 debug3("%s entering: type %d", __func__, type); 170 171 mm_request_receive(sock, m); 172 rtype = buffer_get_char(m); 173 if (rtype != type) 174 fatal("%s: read: rtype %d != type %d", __func__, 175 rtype, type); 176 } 177 178 #ifdef WITH_OPENSSL 179 DH * 180 mm_choose_dh(int min, int nbits, int max) 181 { 182 BIGNUM *p, *g; 183 int success = 0; 184 Buffer m; 185 186 buffer_init(&m); 187 buffer_put_int(&m, min); 188 buffer_put_int(&m, nbits); 189 buffer_put_int(&m, max); 190 191 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); 192 193 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 194 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); 195 196 success = buffer_get_char(&m); 197 if (success == 0) 198 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 199 200 if ((p = BN_new()) == NULL) 201 fatal("%s: BN_new failed", __func__); 202 if ((g = BN_new()) == NULL) 203 fatal("%s: BN_new failed", __func__); 204 buffer_get_bignum2(&m, p); 205 buffer_get_bignum2(&m, g); 206 207 debug3("%s: remaining %d", __func__, buffer_len(&m)); 208 buffer_free(&m); 209 210 return (dh_new_group(g, p)); 211 } 212 #endif 213 214 int 215 mm_key_sign(struct sshkey *key, u_char **sigp, u_int *lenp, 216 const u_char *data, u_int datalen, const char *hostkey_alg) 217 { 218 struct kex *kex = *pmonitor->m_pkex; 219 Buffer m; 220 221 debug3("%s entering", __func__); 222 223 buffer_init(&m); 224 buffer_put_int(&m, kex->host_key_index(key, 0, active_state)); 225 buffer_put_string(&m, data, datalen); 226 buffer_put_cstring(&m, hostkey_alg); 227 228 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); 229 230 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 231 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); 232 *sigp = buffer_get_string(&m, lenp); 233 buffer_free(&m); 234 235 return (0); 236 } 237 238 struct passwd * 239 mm_getpwnamallow(const char *username) 240 { 241 struct ssh *ssh = active_state; /* XXX */ 242 Buffer m; 243 struct passwd *pw; 244 u_int len, i; 245 ServerOptions *newopts; 246 247 debug3("%s entering", __func__); 248 249 buffer_init(&m); 250 buffer_put_cstring(&m, username); 251 252 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); 253 254 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 255 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); 256 257 if (buffer_get_char(&m) == 0) { 258 pw = NULL; 259 goto out; 260 } 261 pw = buffer_get_string(&m, &len); 262 if (len != sizeof(struct passwd)) 263 fatal("%s: struct passwd size mismatch", __func__); 264 pw->pw_name = buffer_get_string(&m, NULL); 265 pw->pw_passwd = buffer_get_string(&m, NULL); 266 pw->pw_gecos = buffer_get_string(&m, NULL); 267 pw->pw_class = buffer_get_string(&m, NULL); 268 pw->pw_dir = buffer_get_string(&m, NULL); 269 pw->pw_shell = buffer_get_string(&m, NULL); 270 271 out: 272 /* copy options block as a Match directive may have changed some */ 273 newopts = buffer_get_string(&m, &len); 274 if (len != sizeof(*newopts)) 275 fatal("%s: option block size mismatch", __func__); 276 277 #define M_CP_STROPT(x) do { \ 278 if (newopts->x != NULL) \ 279 newopts->x = buffer_get_string(&m, NULL); \ 280 } while (0) 281 #define M_CP_STRARRAYOPT(x, nx) do { \ 282 newopts->x = newopts->nx == 0 ? \ 283 NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \ 284 for (i = 0; i < newopts->nx; i++) \ 285 newopts->x[i] = buffer_get_string(&m, NULL); \ 286 } while (0) 287 /* See comment in servconf.h */ 288 COPY_MATCH_STRING_OPTS(); 289 #undef M_CP_STROPT 290 #undef M_CP_STRARRAYOPT 291 292 copy_set_server_options(&options, newopts, 1); 293 log_change_level(options.log_level); 294 process_permitopen(ssh, &options); 295 free(newopts); 296 297 buffer_free(&m); 298 299 return (pw); 300 } 301 302 char * 303 mm_auth2_read_banner(void) 304 { 305 Buffer m; 306 char *banner; 307 308 debug3("%s entering", __func__); 309 310 buffer_init(&m); 311 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); 312 buffer_clear(&m); 313 314 mm_request_receive_expect(pmonitor->m_recvfd, 315 MONITOR_ANS_AUTH2_READ_BANNER, &m); 316 banner = buffer_get_string(&m, NULL); 317 buffer_free(&m); 318 319 /* treat empty banner as missing banner */ 320 if (strlen(banner) == 0) { 321 free(banner); 322 banner = NULL; 323 } 324 return (banner); 325 } 326 327 /* Inform the privileged process about service and style */ 328 329 void 330 mm_inform_authserv(char *service, char *style) 331 { 332 Buffer m; 333 334 debug3("%s entering", __func__); 335 336 buffer_init(&m); 337 buffer_put_cstring(&m, service); 338 buffer_put_cstring(&m, style ? style : ""); 339 340 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); 341 342 buffer_free(&m); 343 } 344 345 /* Do the password authentication */ 346 int 347 mm_auth_password(struct ssh *ssh, const char *password) 348 { 349 Buffer m; 350 int authenticated = 0; 351 352 debug3("%s entering", __func__); 353 354 buffer_init(&m); 355 buffer_put_cstring(&m, password); 356 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); 357 358 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 359 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); 360 361 authenticated = buffer_get_int(&m); 362 363 buffer_free(&m); 364 365 debug3("%s: user %sauthenticated", 366 __func__, authenticated ? "" : "not "); 367 return (authenticated); 368 } 369 370 int 371 mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key, 372 int pubkey_auth_attempt, struct sshauthopt **authoptp) 373 { 374 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key, 375 pubkey_auth_attempt, authoptp)); 376 } 377 378 int 379 mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host, 380 struct sshkey *key) 381 { 382 return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL)); 383 } 384 385 int 386 mm_key_allowed(enum mm_keytype type, const char *user, const char *host, 387 struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp) 388 { 389 Buffer m; 390 u_char *blob; 391 u_int len; 392 int r, allowed = 0; 393 struct sshauthopt *opts = NULL; 394 395 debug3("%s entering", __func__); 396 397 if (authoptp != NULL) 398 *authoptp = NULL; 399 400 /* Convert the key to a blob and the pass it over */ 401 if (!key_to_blob(key, &blob, &len)) 402 return 0; 403 404 buffer_init(&m); 405 buffer_put_int(&m, type); 406 buffer_put_cstring(&m, user ? user : ""); 407 buffer_put_cstring(&m, host ? host : ""); 408 buffer_put_string(&m, blob, len); 409 buffer_put_int(&m, pubkey_auth_attempt); 410 free(blob); 411 412 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); 413 414 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 415 mm_request_receive_expect(pmonitor->m_recvfd, 416 MONITOR_ANS_KEYALLOWED, &m); 417 418 allowed = buffer_get_int(&m); 419 if (allowed && type == MM_USERKEY) { 420 if ((r = sshauthopt_deserialise(&m, &opts)) != 0) 421 fatal("%s: sshauthopt_deserialise: %s", 422 __func__, ssh_err(r)); 423 } 424 buffer_free(&m); 425 426 if (authoptp != NULL) { 427 *authoptp = opts; 428 opts = NULL; 429 } 430 sshauthopt_free(opts); 431 432 return allowed; 433 } 434 435 /* 436 * This key verify needs to send the key type along, because the 437 * privileged parent makes the decision if the key is allowed 438 * for authentication. 439 */ 440 441 int 442 mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen, 443 const u_char *data, size_t datalen, const char *sigalg, u_int compat) 444 { 445 Buffer m; 446 u_char *blob; 447 u_int len; 448 u_int encoded_ret = 0; 449 450 debug3("%s entering", __func__); 451 452 /* Convert the key to a blob and the pass it over */ 453 if (!key_to_blob(key, &blob, &len)) 454 return (0); 455 456 buffer_init(&m); 457 buffer_put_string(&m, blob, len); 458 buffer_put_string(&m, sig, siglen); 459 buffer_put_string(&m, data, datalen); 460 buffer_put_cstring(&m, sigalg == NULL ? "" : sigalg); 461 free(blob); 462 463 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); 464 465 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 466 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); 467 468 encoded_ret = buffer_get_int(&m); 469 470 buffer_free(&m); 471 472 if (encoded_ret != 0) 473 return SSH_ERR_SIGNATURE_INVALID; 474 return 0; 475 } 476 477 void 478 mm_send_keystate(struct monitor *monitor) 479 { 480 struct ssh *ssh = active_state; /* XXX */ 481 struct sshbuf *m; 482 int r; 483 484 if ((m = sshbuf_new()) == NULL) 485 fatal("%s: sshbuf_new failed", __func__); 486 if ((r = ssh_packet_get_state(ssh, m)) != 0) 487 fatal("%s: get_state failed: %s", 488 __func__, ssh_err(r)); 489 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m); 490 debug3("%s: Finished sending state", __func__); 491 sshbuf_free(m); 492 } 493 494 int 495 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 496 { 497 Buffer m; 498 char *p, *msg; 499 int success = 0, tmp1 = -1, tmp2 = -1; 500 501 /* Kludge: ensure there are fds free to receive the pty/tty */ 502 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 503 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 504 error("%s: cannot allocate fds for pty", __func__); 505 if (tmp1 > 0) 506 close(tmp1); 507 if (tmp2 > 0) 508 close(tmp2); 509 return 0; 510 } 511 close(tmp1); 512 close(tmp2); 513 514 buffer_init(&m); 515 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); 516 517 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 518 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); 519 520 success = buffer_get_int(&m); 521 if (success == 0) { 522 debug3("%s: pty alloc failed", __func__); 523 buffer_free(&m); 524 return (0); 525 } 526 p = buffer_get_string(&m, NULL); 527 msg = buffer_get_string(&m, NULL); 528 buffer_free(&m); 529 530 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 531 free(p); 532 533 buffer_append(&loginmsg, msg, strlen(msg)); 534 free(msg); 535 536 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 537 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 538 fatal("%s: receive fds failed", __func__); 539 540 /* Success */ 541 return (1); 542 } 543 544 void 545 mm_session_pty_cleanup2(Session *s) 546 { 547 Buffer m; 548 549 if (s->ttyfd == -1) 550 return; 551 buffer_init(&m); 552 buffer_put_cstring(&m, s->tty); 553 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); 554 buffer_free(&m); 555 556 /* closed dup'ed master */ 557 if (s->ptymaster != -1 && close(s->ptymaster) < 0) 558 error("close(s->ptymaster/%d): %s", 559 s->ptymaster, strerror(errno)); 560 561 /* unlink pty from session */ 562 s->ttyfd = -1; 563 } 564 565 #ifdef USE_PAM 566 void 567 mm_start_pam(Authctxt *authctxt) 568 { 569 Buffer m; 570 571 debug3("%s entering", __func__); 572 if (!options.use_pam) 573 fatal("UsePAM=no, but ended up in %s anyway", __func__); 574 575 buffer_init(&m); 576 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); 577 578 buffer_free(&m); 579 } 580 581 u_int 582 mm_do_pam_account(void) 583 { 584 Buffer m; 585 u_int ret; 586 char *msg; 587 588 debug3("%s entering", __func__); 589 if (!options.use_pam) 590 fatal("UsePAM=no, but ended up in %s anyway", __func__); 591 592 buffer_init(&m); 593 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); 594 595 mm_request_receive_expect(pmonitor->m_recvfd, 596 MONITOR_ANS_PAM_ACCOUNT, &m); 597 ret = buffer_get_int(&m); 598 msg = buffer_get_string(&m, NULL); 599 buffer_append(&loginmsg, msg, strlen(msg)); 600 free(msg); 601 602 buffer_free(&m); 603 604 debug3("%s returning %d", __func__, ret); 605 606 return (ret); 607 } 608 609 void * 610 mm_sshpam_init_ctx(Authctxt *authctxt) 611 { 612 Buffer m; 613 int success; 614 615 debug3("%s", __func__); 616 buffer_init(&m); 617 buffer_put_cstring(&m, authctxt->user); 618 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); 619 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); 620 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); 621 success = buffer_get_int(&m); 622 if (success == 0) { 623 debug3("%s: pam_init_ctx failed", __func__); 624 buffer_free(&m); 625 return (NULL); 626 } 627 buffer_free(&m); 628 return (authctxt); 629 } 630 631 int 632 mm_sshpam_query(void *ctx, char **name, char **info, 633 u_int *num, char ***prompts, u_int **echo_on) 634 { 635 Buffer m; 636 u_int i; 637 int ret; 638 639 debug3("%s", __func__); 640 buffer_init(&m); 641 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); 642 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); 643 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); 644 ret = buffer_get_int(&m); 645 debug3("%s: pam_query returned %d", __func__, ret); 646 *name = buffer_get_string(&m, NULL); 647 *info = buffer_get_string(&m, NULL); 648 *num = buffer_get_int(&m); 649 if (*num > PAM_MAX_NUM_MSG) 650 fatal("%s: received %u PAM messages, expected <= %u", 651 __func__, *num, PAM_MAX_NUM_MSG); 652 *prompts = xcalloc((*num + 1), sizeof(char *)); 653 *echo_on = xcalloc((*num + 1), sizeof(u_int)); 654 for (i = 0; i < *num; ++i) { 655 (*prompts)[i] = buffer_get_string(&m, NULL); 656 (*echo_on)[i] = buffer_get_int(&m); 657 } 658 buffer_free(&m); 659 return (ret); 660 } 661 662 int 663 mm_sshpam_respond(void *ctx, u_int num, char **resp) 664 { 665 Buffer m; 666 u_int i; 667 int ret; 668 669 debug3("%s", __func__); 670 buffer_init(&m); 671 buffer_put_int(&m, num); 672 for (i = 0; i < num; ++i) 673 buffer_put_cstring(&m, resp[i]); 674 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); 675 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); 676 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); 677 ret = buffer_get_int(&m); 678 debug3("%s: pam_respond returned %d", __func__, ret); 679 buffer_free(&m); 680 return (ret); 681 } 682 683 void 684 mm_sshpam_free_ctx(void *ctxtp) 685 { 686 Buffer m; 687 688 debug3("%s", __func__); 689 buffer_init(&m); 690 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); 691 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); 692 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); 693 buffer_free(&m); 694 } 695 #endif /* USE_PAM */ 696 697 /* Request process termination */ 698 699 void 700 mm_terminate(void) 701 { 702 Buffer m; 703 704 buffer_init(&m); 705 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); 706 buffer_free(&m); 707 } 708 709 #if defined(BSD_AUTH) || defined(SKEY) 710 static void 711 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 712 char ***prompts, u_int **echo_on) 713 { 714 *name = xstrdup(""); 715 *infotxt = xstrdup(""); 716 *numprompts = 1; 717 *prompts = xcalloc(*numprompts, sizeof(char *)); 718 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 719 (*echo_on)[0] = 0; 720 } 721 722 #ifdef BSD_AUTH 723 int 724 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 725 u_int *numprompts, char ***prompts, u_int **echo_on) 726 { 727 Buffer m; 728 u_int success; 729 char *challenge; 730 731 debug3("%s: entering", __func__); 732 733 buffer_init(&m); 734 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); 735 736 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, 737 &m); 738 success = buffer_get_int(&m); 739 if (success == 0) { 740 debug3("%s: no challenge", __func__); 741 buffer_free(&m); 742 return (-1); 743 } 744 745 /* Get the challenge, and format the response */ 746 challenge = buffer_get_string(&m, NULL); 747 buffer_free(&m); 748 749 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 750 (*prompts)[0] = challenge; 751 752 debug3("%s: received challenge: %s", __func__, challenge); 753 754 return (0); 755 } 756 757 int 758 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 759 { 760 Buffer m; 761 int authok; 762 763 debug3("%s: entering", __func__); 764 if (numresponses != 1) 765 return (-1); 766 767 buffer_init(&m); 768 buffer_put_cstring(&m, responses[0]); 769 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); 770 771 mm_request_receive_expect(pmonitor->m_recvfd, 772 MONITOR_ANS_BSDAUTHRESPOND, &m); 773 774 authok = buffer_get_int(&m); 775 buffer_free(&m); 776 777 return ((authok == 0) ? -1 : 0); 778 } 779 #endif 780 781 #ifdef SKEY 782 int 783 mm_skey_query(void *ctx, char **name, char **infotxt, 784 u_int *numprompts, char ***prompts, u_int **echo_on) 785 { 786 Buffer m; 787 u_int success; 788 char *challenge; 789 790 debug3("%s: entering", __func__); 791 792 buffer_init(&m); 793 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); 794 795 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, 796 &m); 797 success = buffer_get_int(&m); 798 if (success == 0) { 799 debug3("%s: no challenge", __func__); 800 buffer_free(&m); 801 return (-1); 802 } 803 804 /* Get the challenge, and format the response */ 805 challenge = buffer_get_string(&m, NULL); 806 buffer_free(&m); 807 808 debug3("%s: received challenge: %s", __func__, challenge); 809 810 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 811 812 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); 813 free(challenge); 814 815 return (0); 816 } 817 818 int 819 mm_skey_respond(void *ctx, u_int numresponses, char **responses) 820 { 821 Buffer m; 822 int authok; 823 824 debug3("%s: entering", __func__); 825 if (numresponses != 1) 826 return (-1); 827 828 buffer_init(&m); 829 buffer_put_cstring(&m, responses[0]); 830 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); 831 832 mm_request_receive_expect(pmonitor->m_recvfd, 833 MONITOR_ANS_SKEYRESPOND, &m); 834 835 authok = buffer_get_int(&m); 836 buffer_free(&m); 837 838 return ((authok == 0) ? -1 : 0); 839 } 840 #endif /* SKEY */ 841 #endif /* BSDAUTH || SKEY */ 842 843 #ifdef GSSAPI 844 OM_uint32 845 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 846 { 847 Buffer m; 848 OM_uint32 major; 849 850 /* Client doesn't get to see the context */ 851 *ctx = NULL; 852 853 buffer_init(&m); 854 buffer_put_string(&m, goid->elements, goid->length); 855 856 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); 857 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); 858 859 major = buffer_get_int(&m); 860 861 buffer_free(&m); 862 return (major); 863 } 864 865 OM_uint32 866 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 867 gss_buffer_desc *out, OM_uint32 *flags) 868 { 869 Buffer m; 870 OM_uint32 major; 871 u_int len; 872 873 buffer_init(&m); 874 buffer_put_string(&m, in->value, in->length); 875 876 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); 877 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); 878 879 major = buffer_get_int(&m); 880 out->value = buffer_get_string(&m, &len); 881 out->length = len; 882 if (flags) 883 *flags = buffer_get_int(&m); 884 885 buffer_free(&m); 886 887 return (major); 888 } 889 890 OM_uint32 891 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 892 { 893 Buffer m; 894 OM_uint32 major; 895 896 buffer_init(&m); 897 buffer_put_string(&m, gssbuf->value, gssbuf->length); 898 buffer_put_string(&m, gssmic->value, gssmic->length); 899 900 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); 901 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, 902 &m); 903 904 major = buffer_get_int(&m); 905 buffer_free(&m); 906 return(major); 907 } 908 909 int 910 mm_ssh_gssapi_userok(char *user) 911 { 912 Buffer m; 913 int authenticated = 0; 914 915 buffer_init(&m); 916 917 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); 918 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, 919 &m); 920 921 authenticated = buffer_get_int(&m); 922 923 buffer_free(&m); 924 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 925 return (authenticated); 926 } 927 #endif /* GSSAPI */ 928 929 #ifdef KRB5 930 int 931 mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp) 932 { 933 krb5_data *tkt, *reply; 934 Buffer m; 935 int success; 936 937 debug3("%s entering", __func__); 938 tkt = (krb5_data *) argp; 939 reply = (krb5_data *) resp; 940 941 buffer_init(&m); 942 buffer_put_string(&m, tkt->data, tkt->length); 943 944 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m); 945 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m); 946 947 success = buffer_get_int(&m); 948 if (success) { 949 u_int len; 950 951 *userp = buffer_get_string(&m, NULL); 952 reply->data = buffer_get_string(&m, &len); 953 reply->length = len; 954 } else { 955 memset(reply, 0, sizeof(*reply)); 956 *userp = NULL; 957 } 958 959 buffer_free(&m); 960 return (success); 961 } 962 #endif 963