1 /* $OpenBSD: monitor.c,v 1.117 2012/06/22 12:30:26 dtucker 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 <sys/types.h> 29 #include <sys/wait.h> 30 #include <sys/socket.h> 31 #include <sys/tree.h> 32 #include <sys/param.h> 33 #include <sys/queue.h> 34 35 #include <openssl/dh.h> 36 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <paths.h> 40 #include <poll.h> 41 #include <pwd.h> 42 #include <signal.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "atomicio.h" 47 #include "xmalloc.h" 48 #include "ssh.h" 49 #include "key.h" 50 #include "buffer.h" 51 #include "hostfile.h" 52 #include "auth.h" 53 #include "cipher.h" 54 #include "kex.h" 55 #include "dh.h" 56 #include <zlib.h> 57 #include "packet.h" 58 #include "auth-options.h" 59 #include "sshpty.h" 60 #include "channels.h" 61 #include "session.h" 62 #include "sshlogin.h" 63 #include "canohost.h" 64 #include "log.h" 65 #include "servconf.h" 66 #include "monitor.h" 67 #include "monitor_mm.h" 68 #ifdef GSSAPI 69 #include "ssh-gss.h" 70 #endif 71 #include "monitor_wrap.h" 72 #include "monitor_fdpass.h" 73 #include "misc.h" 74 #include "compat.h" 75 #include "ssh2.h" 76 #include "jpake.h" 77 #include "roaming.h" 78 79 #ifdef GSSAPI 80 static Gssctxt *gsscontext = NULL; 81 #endif 82 83 /* Imports */ 84 extern ServerOptions options; 85 extern u_int utmp_len; 86 extern Newkeys *current_keys[]; 87 extern z_stream incoming_stream; 88 extern z_stream outgoing_stream; 89 extern u_char session_id[]; 90 extern Buffer auth_debug; 91 extern int auth_debug_init; 92 extern Buffer loginmsg; 93 94 /* State exported from the child */ 95 96 struct { 97 z_stream incoming; 98 z_stream outgoing; 99 u_char *keyin; 100 u_int keyinlen; 101 u_char *keyout; 102 u_int keyoutlen; 103 u_char *ivin; 104 u_int ivinlen; 105 u_char *ivout; 106 u_int ivoutlen; 107 u_char *ssh1key; 108 u_int ssh1keylen; 109 int ssh1cipher; 110 int ssh1protoflags; 111 u_char *input; 112 u_int ilen; 113 u_char *output; 114 u_int olen; 115 u_int64_t sent_bytes; 116 u_int64_t recv_bytes; 117 } child_state; 118 119 /* Functions on the monitor that answer unprivileged requests */ 120 121 int mm_answer_moduli(int, Buffer *); 122 int mm_answer_sign(int, Buffer *); 123 int mm_answer_pwnamallow(int, Buffer *); 124 int mm_answer_auth2_read_banner(int, Buffer *); 125 int mm_answer_authserv(int, Buffer *); 126 int mm_answer_authpassword(int, Buffer *); 127 int mm_answer_bsdauthquery(int, Buffer *); 128 int mm_answer_bsdauthrespond(int, Buffer *); 129 int mm_answer_skeyquery(int, Buffer *); 130 int mm_answer_skeyrespond(int, Buffer *); 131 int mm_answer_keyallowed(int, Buffer *); 132 int mm_answer_keyverify(int, Buffer *); 133 int mm_answer_pty(int, Buffer *); 134 int mm_answer_pty_cleanup(int, Buffer *); 135 int mm_answer_term(int, Buffer *); 136 int mm_answer_rsa_keyallowed(int, Buffer *); 137 int mm_answer_rsa_challenge(int, Buffer *); 138 int mm_answer_rsa_response(int, Buffer *); 139 int mm_answer_sesskey(int, Buffer *); 140 int mm_answer_sessid(int, Buffer *); 141 int mm_answer_jpake_get_pwdata(int, Buffer *); 142 int mm_answer_jpake_step1(int, Buffer *); 143 int mm_answer_jpake_step2(int, Buffer *); 144 int mm_answer_jpake_key_confirm(int, Buffer *); 145 int mm_answer_jpake_check_confirm(int, Buffer *); 146 147 #ifdef GSSAPI 148 int mm_answer_gss_setup_ctx(int, Buffer *); 149 int mm_answer_gss_accept_ctx(int, Buffer *); 150 int mm_answer_gss_userok(int, Buffer *); 151 int mm_answer_gss_checkmic(int, Buffer *); 152 #endif 153 154 static int monitor_read_log(struct monitor *); 155 156 static Authctxt *authctxt; 157 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ 158 159 /* local state for key verify */ 160 static u_char *key_blob = NULL; 161 static u_int key_bloblen = 0; 162 static int key_blobtype = MM_NOKEY; 163 static char *hostbased_cuser = NULL; 164 static char *hostbased_chost = NULL; 165 static char *auth_method = "unknown"; 166 static u_int session_id2_len = 0; 167 static u_char *session_id2 = NULL; 168 static pid_t monitor_child_pid; 169 170 struct mon_table { 171 enum monitor_reqtype type; 172 int flags; 173 int (*f)(int, Buffer *); 174 }; 175 176 #define MON_ISAUTH 0x0004 /* Required for Authentication */ 177 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ 178 #define MON_ONCE 0x0010 /* Disable after calling */ 179 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ 180 181 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) 182 183 #define MON_PERMIT 0x1000 /* Request is permitted */ 184 185 struct mon_table mon_dispatch_proto20[] = { 186 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, 187 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, 188 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, 189 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, 190 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, 191 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 192 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 193 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, 194 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, 195 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, 196 #ifdef GSSAPI 197 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, 198 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, 199 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, 200 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, 201 #endif 202 #ifdef JPAKE 203 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata}, 204 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1}, 205 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2}, 206 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm}, 207 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm}, 208 #endif 209 {0, 0, NULL} 210 }; 211 212 struct mon_table mon_dispatch_postauth20[] = { 213 {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, 214 {MONITOR_REQ_SIGN, 0, mm_answer_sign}, 215 {MONITOR_REQ_PTY, 0, mm_answer_pty}, 216 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, 217 {MONITOR_REQ_TERM, 0, mm_answer_term}, 218 {0, 0, NULL} 219 }; 220 221 struct mon_table mon_dispatch_proto15[] = { 222 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, 223 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, 224 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, 225 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 226 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, 227 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, 228 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, 229 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, 230 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 231 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, 232 {0, 0, NULL} 233 }; 234 235 struct mon_table mon_dispatch_postauth15[] = { 236 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, 237 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, 238 {MONITOR_REQ_TERM, 0, mm_answer_term}, 239 {0, 0, NULL} 240 }; 241 242 struct mon_table *mon_dispatch; 243 244 /* Specifies if a certain message is allowed at the moment */ 245 246 static void 247 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) 248 { 249 while (ent->f != NULL) { 250 if (ent->type == type) { 251 ent->flags &= ~MON_PERMIT; 252 ent->flags |= permit ? MON_PERMIT : 0; 253 return; 254 } 255 ent++; 256 } 257 } 258 259 static void 260 monitor_permit_authentications(int permit) 261 { 262 struct mon_table *ent = mon_dispatch; 263 264 while (ent->f != NULL) { 265 if (ent->flags & MON_AUTH) { 266 ent->flags &= ~MON_PERMIT; 267 ent->flags |= permit ? MON_PERMIT : 0; 268 } 269 ent++; 270 } 271 } 272 273 void 274 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) 275 { 276 struct mon_table *ent; 277 int authenticated = 0; 278 279 debug3("preauth child monitor started"); 280 281 close(pmonitor->m_recvfd); 282 close(pmonitor->m_log_sendfd); 283 pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1; 284 285 authctxt = _authctxt; 286 memset(authctxt, 0, sizeof(*authctxt)); 287 288 if (compat20) { 289 mon_dispatch = mon_dispatch_proto20; 290 291 /* Permit requests for moduli and signatures */ 292 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 293 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 294 } else { 295 mon_dispatch = mon_dispatch_proto15; 296 297 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); 298 } 299 300 /* The first few requests do not require asynchronous access */ 301 while (!authenticated) { 302 auth_method = "unknown"; 303 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); 304 if (authenticated) { 305 if (!(ent->flags & MON_AUTHDECIDE)) 306 fatal("%s: unexpected authentication from %d", 307 __func__, ent->type); 308 if (authctxt->pw->pw_uid == 0 && 309 !auth_root_allowed(auth_method)) 310 authenticated = 0; 311 } 312 313 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { 314 auth_log(authctxt, authenticated, auth_method, 315 compat20 ? " ssh2" : ""); 316 if (!authenticated) 317 authctxt->failures++; 318 } 319 #ifdef JPAKE 320 /* Cleanup JPAKE context after authentication */ 321 if (ent->flags & MON_AUTHDECIDE) { 322 if (authctxt->jpake_ctx != NULL) { 323 jpake_free(authctxt->jpake_ctx); 324 authctxt->jpake_ctx = NULL; 325 } 326 } 327 #endif 328 } 329 330 /* Drain any buffered messages from the child */ 331 while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0) 332 ; 333 334 if (!authctxt->valid) 335 fatal("%s: authenticated invalid user", __func__); 336 if (strcmp(auth_method, "unknown") == 0) 337 fatal("%s: authentication method name unknown", __func__); 338 339 debug("%s: %s has been authenticated by privileged process", 340 __func__, authctxt->user); 341 342 mm_get_keystate(pmonitor); 343 344 close(pmonitor->m_sendfd); 345 close(pmonitor->m_log_recvfd); 346 pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1; 347 } 348 349 static void 350 monitor_set_child_handler(pid_t pid) 351 { 352 monitor_child_pid = pid; 353 } 354 355 static void 356 monitor_child_handler(int sig) 357 { 358 kill(monitor_child_pid, sig); 359 } 360 361 void 362 monitor_child_postauth(struct monitor *pmonitor) 363 { 364 close(pmonitor->m_recvfd); 365 pmonitor->m_recvfd = -1; 366 367 monitor_set_child_handler(pmonitor->m_pid); 368 signal(SIGHUP, &monitor_child_handler); 369 signal(SIGTERM, &monitor_child_handler); 370 signal(SIGINT, &monitor_child_handler); 371 372 if (compat20) { 373 mon_dispatch = mon_dispatch_postauth20; 374 375 /* Permit requests for moduli and signatures */ 376 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 377 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 378 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 379 } else { 380 mon_dispatch = mon_dispatch_postauth15; 381 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 382 } 383 if (!no_pty_flag) { 384 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); 385 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); 386 } 387 388 for (;;) 389 monitor_read(pmonitor, mon_dispatch, NULL); 390 } 391 392 void 393 monitor_sync(struct monitor *pmonitor) 394 { 395 if (options.compression) { 396 /* The member allocation is not visible, so sync it */ 397 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); 398 } 399 } 400 401 static int 402 monitor_read_log(struct monitor *pmonitor) 403 { 404 Buffer logmsg; 405 u_int len, level; 406 char *msg; 407 408 buffer_init(&logmsg); 409 410 /* Read length */ 411 buffer_append_space(&logmsg, 4); 412 if (atomicio(read, pmonitor->m_log_recvfd, 413 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) { 414 if (errno == EPIPE) { 415 buffer_free(&logmsg); 416 debug("%s: child log fd closed", __func__); 417 close(pmonitor->m_log_recvfd); 418 pmonitor->m_log_recvfd = -1; 419 return -1; 420 } 421 fatal("%s: log fd read: %s", __func__, strerror(errno)); 422 } 423 len = buffer_get_int(&logmsg); 424 if (len <= 4 || len > 8192) 425 fatal("%s: invalid log message length %u", __func__, len); 426 427 /* Read severity, message */ 428 buffer_clear(&logmsg); 429 buffer_append_space(&logmsg, len); 430 if (atomicio(read, pmonitor->m_log_recvfd, 431 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) 432 fatal("%s: log fd read: %s", __func__, strerror(errno)); 433 434 /* Log it */ 435 level = buffer_get_int(&logmsg); 436 msg = buffer_get_string(&logmsg, NULL); 437 if (log_level_name(level) == NULL) 438 fatal("%s: invalid log level %u (corrupted message?)", 439 __func__, level); 440 do_log2(level, "%s [preauth]", msg); 441 442 buffer_free(&logmsg); 443 xfree(msg); 444 445 return 0; 446 } 447 448 int 449 monitor_read(struct monitor *pmonitor, struct mon_table *ent, 450 struct mon_table **pent) 451 { 452 Buffer m; 453 int ret; 454 u_char type; 455 struct pollfd pfd[2]; 456 457 for (;;) { 458 bzero(&pfd, sizeof(pfd)); 459 pfd[0].fd = pmonitor->m_sendfd; 460 pfd[0].events = POLLIN; 461 pfd[1].fd = pmonitor->m_log_recvfd; 462 pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN; 463 if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) { 464 if (errno == EINTR || errno == EAGAIN) 465 continue; 466 fatal("%s: poll: %s", __func__, strerror(errno)); 467 } 468 if (pfd[1].revents) { 469 /* 470 * Drain all log messages before processing next 471 * monitor request. 472 */ 473 monitor_read_log(pmonitor); 474 continue; 475 } 476 if (pfd[0].revents) 477 break; /* Continues below */ 478 } 479 480 buffer_init(&m); 481 482 mm_request_receive(pmonitor->m_sendfd, &m); 483 type = buffer_get_char(&m); 484 485 debug3("%s: checking request %d", __func__, type); 486 487 while (ent->f != NULL) { 488 if (ent->type == type) 489 break; 490 ent++; 491 } 492 493 if (ent->f != NULL) { 494 if (!(ent->flags & MON_PERMIT)) 495 fatal("%s: unpermitted request %d", __func__, 496 type); 497 ret = (*ent->f)(pmonitor->m_sendfd, &m); 498 buffer_free(&m); 499 500 /* The child may use this request only once, disable it */ 501 if (ent->flags & MON_ONCE) { 502 debug2("%s: %d used once, disabling now", __func__, 503 type); 504 ent->flags &= ~MON_PERMIT; 505 } 506 507 if (pent != NULL) 508 *pent = ent; 509 510 return ret; 511 } 512 513 fatal("%s: unsupported request: %d", __func__, type); 514 515 /* NOTREACHED */ 516 return (-1); 517 } 518 519 /* allowed key state */ 520 static int 521 monitor_allowed_key(u_char *blob, u_int bloblen) 522 { 523 /* make sure key is allowed */ 524 if (key_blob == NULL || key_bloblen != bloblen || 525 timingsafe_bcmp(key_blob, blob, key_bloblen)) 526 return (0); 527 return (1); 528 } 529 530 static void 531 monitor_reset_key_state(void) 532 { 533 /* reset state */ 534 if (key_blob != NULL) 535 xfree(key_blob); 536 if (hostbased_cuser != NULL) 537 xfree(hostbased_cuser); 538 if (hostbased_chost != NULL) 539 xfree(hostbased_chost); 540 key_blob = NULL; 541 key_bloblen = 0; 542 key_blobtype = MM_NOKEY; 543 hostbased_cuser = NULL; 544 hostbased_chost = NULL; 545 } 546 547 int 548 mm_answer_moduli(int sock, Buffer *m) 549 { 550 DH *dh; 551 int min, want, max; 552 553 min = buffer_get_int(m); 554 want = buffer_get_int(m); 555 max = buffer_get_int(m); 556 557 debug3("%s: got parameters: %d %d %d", 558 __func__, min, want, max); 559 /* We need to check here, too, in case the child got corrupted */ 560 if (max < min || want < min || max < want) 561 fatal("%s: bad parameters: %d %d %d", 562 __func__, min, want, max); 563 564 buffer_clear(m); 565 566 dh = choose_dh(min, want, max); 567 if (dh == NULL) { 568 buffer_put_char(m, 0); 569 return (0); 570 } else { 571 /* Send first bignum */ 572 buffer_put_char(m, 1); 573 buffer_put_bignum2(m, dh->p); 574 buffer_put_bignum2(m, dh->g); 575 576 DH_free(dh); 577 } 578 mm_request_send(sock, MONITOR_ANS_MODULI, m); 579 return (0); 580 } 581 582 int 583 mm_answer_sign(int sock, Buffer *m) 584 { 585 Key *key; 586 u_char *p; 587 u_char *signature; 588 u_int siglen, datlen; 589 int keyid; 590 591 debug3("%s", __func__); 592 593 keyid = buffer_get_int(m); 594 p = buffer_get_string(m, &datlen); 595 596 /* 597 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes), 598 * SHA384 (48 bytes) and SHA512 (64 bytes). 599 */ 600 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) 601 fatal("%s: data length incorrect: %u", __func__, datlen); 602 603 /* save session id, it will be passed on the first call */ 604 if (session_id2_len == 0) { 605 session_id2_len = datlen; 606 session_id2 = xmalloc(session_id2_len); 607 memcpy(session_id2, p, session_id2_len); 608 } 609 610 if ((key = get_hostkey_by_index(keyid)) == NULL) 611 fatal("%s: no hostkey from index %d", __func__, keyid); 612 if (key_sign(key, &signature, &siglen, p, datlen) < 0) 613 fatal("%s: key_sign failed", __func__); 614 615 debug3("%s: signature %p(%u)", __func__, signature, siglen); 616 617 buffer_clear(m); 618 buffer_put_string(m, signature, siglen); 619 620 xfree(p); 621 xfree(signature); 622 623 mm_request_send(sock, MONITOR_ANS_SIGN, m); 624 625 /* Turn on permissions for getpwnam */ 626 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 627 628 return (0); 629 } 630 631 /* Retrieves the password entry and also checks if the user is permitted */ 632 633 int 634 mm_answer_pwnamallow(int sock, Buffer *m) 635 { 636 char *username; 637 struct passwd *pwent; 638 int allowed = 0; 639 u_int i; 640 641 debug3("%s", __func__); 642 643 if (authctxt->attempt++ != 0) 644 fatal("%s: multiple attempts for getpwnam", __func__); 645 646 username = buffer_get_string(m, NULL); 647 648 pwent = getpwnamallow(username); 649 650 authctxt->user = xstrdup(username); 651 setproctitle("%s [priv]", pwent ? username : "unknown"); 652 xfree(username); 653 654 buffer_clear(m); 655 656 if (pwent == NULL) { 657 buffer_put_char(m, 0); 658 authctxt->pw = fakepw(); 659 goto out; 660 } 661 662 allowed = 1; 663 authctxt->pw = pwent; 664 authctxt->valid = 1; 665 666 buffer_put_char(m, 1); 667 buffer_put_string(m, pwent, sizeof(struct passwd)); 668 buffer_put_cstring(m, pwent->pw_name); 669 buffer_put_cstring(m, "*"); 670 buffer_put_cstring(m, pwent->pw_gecos); 671 buffer_put_cstring(m, pwent->pw_class); 672 buffer_put_cstring(m, pwent->pw_dir); 673 buffer_put_cstring(m, pwent->pw_shell); 674 675 out: 676 buffer_put_string(m, &options, sizeof(options)); 677 678 #define M_CP_STROPT(x) do { \ 679 if (options.x != NULL) \ 680 buffer_put_cstring(m, options.x); \ 681 } while (0) 682 #define M_CP_STRARRAYOPT(x, nx) do { \ 683 for (i = 0; i < options.nx; i++) \ 684 buffer_put_cstring(m, options.x[i]); \ 685 } while (0) 686 /* See comment in servconf.h */ 687 COPY_MATCH_STRING_OPTS(); 688 #undef M_CP_STROPT 689 #undef M_CP_STRARRAYOPT 690 691 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); 692 mm_request_send(sock, MONITOR_ANS_PWNAM, m); 693 694 /* For SSHv1 allow authentication now */ 695 if (!compat20) 696 monitor_permit_authentications(1); 697 else { 698 /* Allow service/style information on the auth context */ 699 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); 700 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); 701 } 702 703 return (0); 704 } 705 706 int mm_answer_auth2_read_banner(int sock, Buffer *m) 707 { 708 char *banner; 709 710 buffer_clear(m); 711 banner = auth2_read_banner(); 712 buffer_put_cstring(m, banner != NULL ? banner : ""); 713 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); 714 715 if (banner != NULL) 716 xfree(banner); 717 718 return (0); 719 } 720 721 int 722 mm_answer_authserv(int sock, Buffer *m) 723 { 724 monitor_permit_authentications(1); 725 726 authctxt->service = buffer_get_string(m, NULL); 727 authctxt->style = buffer_get_string(m, NULL); 728 debug3("%s: service=%s, style=%s", 729 __func__, authctxt->service, authctxt->style); 730 731 if (strlen(authctxt->style) == 0) { 732 xfree(authctxt->style); 733 authctxt->style = NULL; 734 } 735 736 return (0); 737 } 738 739 int 740 mm_answer_authpassword(int sock, Buffer *m) 741 { 742 static int call_count; 743 char *passwd; 744 int authenticated; 745 u_int plen; 746 747 passwd = buffer_get_string(m, &plen); 748 /* Only authenticate if the context is valid */ 749 authenticated = options.password_authentication && 750 auth_password(authctxt, passwd); 751 memset(passwd, 0, strlen(passwd)); 752 xfree(passwd); 753 754 buffer_clear(m); 755 buffer_put_int(m, authenticated); 756 757 debug3("%s: sending result %d", __func__, authenticated); 758 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); 759 760 call_count++; 761 if (plen == 0 && call_count == 1) 762 auth_method = "none"; 763 else 764 auth_method = "password"; 765 766 /* Causes monitor loop to terminate if authenticated */ 767 return (authenticated); 768 } 769 770 int 771 mm_answer_bsdauthquery(int sock, Buffer *m) 772 { 773 char *name, *infotxt; 774 u_int numprompts; 775 u_int *echo_on; 776 char **prompts; 777 u_int success; 778 779 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, 780 &prompts, &echo_on) < 0 ? 0 : 1; 781 782 buffer_clear(m); 783 buffer_put_int(m, success); 784 if (success) 785 buffer_put_cstring(m, prompts[0]); 786 787 debug3("%s: sending challenge success: %u", __func__, success); 788 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); 789 790 if (success) { 791 xfree(name); 792 xfree(infotxt); 793 xfree(prompts); 794 xfree(echo_on); 795 } 796 797 return (0); 798 } 799 800 int 801 mm_answer_bsdauthrespond(int sock, Buffer *m) 802 { 803 char *response; 804 int authok; 805 806 if (authctxt->as == 0) 807 fatal("%s: no bsd auth session", __func__); 808 809 response = buffer_get_string(m, NULL); 810 authok = options.challenge_response_authentication && 811 auth_userresponse(authctxt->as, response, 0); 812 authctxt->as = NULL; 813 debug3("%s: <%s> = <%d>", __func__, response, authok); 814 xfree(response); 815 816 buffer_clear(m); 817 buffer_put_int(m, authok); 818 819 debug3("%s: sending authenticated: %d", __func__, authok); 820 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); 821 822 auth_method = "bsdauth"; 823 824 return (authok != 0); 825 } 826 827 int 828 mm_answer_keyallowed(int sock, Buffer *m) 829 { 830 Key *key; 831 char *cuser, *chost; 832 u_char *blob; 833 u_int bloblen; 834 enum mm_keytype type = 0; 835 int allowed = 0; 836 837 debug3("%s entering", __func__); 838 839 type = buffer_get_int(m); 840 cuser = buffer_get_string(m, NULL); 841 chost = buffer_get_string(m, NULL); 842 blob = buffer_get_string(m, &bloblen); 843 844 key = key_from_blob(blob, bloblen); 845 846 if ((compat20 && type == MM_RSAHOSTKEY) || 847 (!compat20 && type != MM_RSAHOSTKEY)) 848 fatal("%s: key type and protocol mismatch", __func__); 849 850 debug3("%s: key_from_blob: %p", __func__, key); 851 852 if (key != NULL && authctxt->valid) { 853 switch (type) { 854 case MM_USERKEY: 855 allowed = options.pubkey_authentication && 856 user_key_allowed(authctxt->pw, key); 857 auth_method = "publickey"; 858 if (options.pubkey_authentication && allowed != 1) 859 auth_clear_options(); 860 break; 861 case MM_HOSTKEY: 862 allowed = options.hostbased_authentication && 863 hostbased_key_allowed(authctxt->pw, 864 cuser, chost, key); 865 auth_method = "hostbased"; 866 break; 867 case MM_RSAHOSTKEY: 868 key->type = KEY_RSA1; /* XXX */ 869 allowed = options.rhosts_rsa_authentication && 870 auth_rhosts_rsa_key_allowed(authctxt->pw, 871 cuser, chost, key); 872 if (options.rhosts_rsa_authentication && allowed != 1) 873 auth_clear_options(); 874 auth_method = "rsa"; 875 break; 876 default: 877 fatal("%s: unknown key type %d", __func__, type); 878 break; 879 } 880 } 881 if (key != NULL) 882 key_free(key); 883 884 /* clear temporarily storage (used by verify) */ 885 monitor_reset_key_state(); 886 887 if (allowed) { 888 /* Save temporarily for comparison in verify */ 889 key_blob = blob; 890 key_bloblen = bloblen; 891 key_blobtype = type; 892 hostbased_cuser = cuser; 893 hostbased_chost = chost; 894 } else { 895 /* Log failed attempt */ 896 auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); 897 xfree(blob); 898 xfree(cuser); 899 xfree(chost); 900 } 901 902 debug3("%s: key %p is %s", 903 __func__, key, allowed ? "allowed" : "not allowed"); 904 905 buffer_clear(m); 906 buffer_put_int(m, allowed); 907 buffer_put_int(m, forced_command != NULL); 908 909 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); 910 911 if (type == MM_RSAHOSTKEY) 912 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 913 914 return (0); 915 } 916 917 static int 918 monitor_valid_userblob(u_char *data, u_int datalen) 919 { 920 Buffer b; 921 char *p; 922 u_int len; 923 int fail = 0; 924 925 buffer_init(&b); 926 buffer_append(&b, data, datalen); 927 928 if (datafellows & SSH_OLD_SESSIONID) { 929 p = buffer_ptr(&b); 930 len = buffer_len(&b); 931 if ((session_id2 == NULL) || 932 (len < session_id2_len) || 933 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 934 fail++; 935 buffer_consume(&b, session_id2_len); 936 } else { 937 p = buffer_get_string(&b, &len); 938 if ((session_id2 == NULL) || 939 (len != session_id2_len) || 940 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 941 fail++; 942 xfree(p); 943 } 944 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 945 fail++; 946 p = buffer_get_string(&b, NULL); 947 if (strcmp(authctxt->user, p) != 0) { 948 logit("wrong user name passed to monitor: expected %s != %.100s", 949 authctxt->user, p); 950 fail++; 951 } 952 xfree(p); 953 buffer_skip_string(&b); 954 if (datafellows & SSH_BUG_PKAUTH) { 955 if (!buffer_get_char(&b)) 956 fail++; 957 } else { 958 p = buffer_get_string(&b, NULL); 959 if (strcmp("publickey", p) != 0) 960 fail++; 961 xfree(p); 962 if (!buffer_get_char(&b)) 963 fail++; 964 buffer_skip_string(&b); 965 } 966 buffer_skip_string(&b); 967 if (buffer_len(&b) != 0) 968 fail++; 969 buffer_free(&b); 970 return (fail == 0); 971 } 972 973 static int 974 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, 975 char *chost) 976 { 977 Buffer b; 978 char *p; 979 u_int len; 980 int fail = 0; 981 982 buffer_init(&b); 983 buffer_append(&b, data, datalen); 984 985 p = buffer_get_string(&b, &len); 986 if ((session_id2 == NULL) || 987 (len != session_id2_len) || 988 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 989 fail++; 990 xfree(p); 991 992 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 993 fail++; 994 p = buffer_get_string(&b, NULL); 995 if (strcmp(authctxt->user, p) != 0) { 996 logit("wrong user name passed to monitor: expected %s != %.100s", 997 authctxt->user, p); 998 fail++; 999 } 1000 xfree(p); 1001 buffer_skip_string(&b); /* service */ 1002 p = buffer_get_string(&b, NULL); 1003 if (strcmp(p, "hostbased") != 0) 1004 fail++; 1005 xfree(p); 1006 buffer_skip_string(&b); /* pkalg */ 1007 buffer_skip_string(&b); /* pkblob */ 1008 1009 /* verify client host, strip trailing dot if necessary */ 1010 p = buffer_get_string(&b, NULL); 1011 if (((len = strlen(p)) > 0) && p[len - 1] == '.') 1012 p[len - 1] = '\0'; 1013 if (strcmp(p, chost) != 0) 1014 fail++; 1015 xfree(p); 1016 1017 /* verify client user */ 1018 p = buffer_get_string(&b, NULL); 1019 if (strcmp(p, cuser) != 0) 1020 fail++; 1021 xfree(p); 1022 1023 if (buffer_len(&b) != 0) 1024 fail++; 1025 buffer_free(&b); 1026 return (fail == 0); 1027 } 1028 1029 int 1030 mm_answer_keyverify(int sock, Buffer *m) 1031 { 1032 Key *key; 1033 u_char *signature, *data, *blob; 1034 u_int signaturelen, datalen, bloblen; 1035 int verified = 0; 1036 int valid_data = 0; 1037 1038 blob = buffer_get_string(m, &bloblen); 1039 signature = buffer_get_string(m, &signaturelen); 1040 data = buffer_get_string(m, &datalen); 1041 1042 if (hostbased_cuser == NULL || hostbased_chost == NULL || 1043 !monitor_allowed_key(blob, bloblen)) 1044 fatal("%s: bad key, not previously allowed", __func__); 1045 1046 key = key_from_blob(blob, bloblen); 1047 if (key == NULL) 1048 fatal("%s: bad public key blob", __func__); 1049 1050 switch (key_blobtype) { 1051 case MM_USERKEY: 1052 valid_data = monitor_valid_userblob(data, datalen); 1053 break; 1054 case MM_HOSTKEY: 1055 valid_data = monitor_valid_hostbasedblob(data, datalen, 1056 hostbased_cuser, hostbased_chost); 1057 break; 1058 default: 1059 valid_data = 0; 1060 break; 1061 } 1062 if (!valid_data) 1063 fatal("%s: bad signature data blob", __func__); 1064 1065 verified = key_verify(key, signature, signaturelen, data, datalen); 1066 debug3("%s: key %p signature %s", 1067 __func__, key, (verified == 1) ? "verified" : "unverified"); 1068 1069 key_free(key); 1070 xfree(blob); 1071 xfree(signature); 1072 xfree(data); 1073 1074 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; 1075 1076 monitor_reset_key_state(); 1077 1078 buffer_clear(m); 1079 buffer_put_int(m, verified); 1080 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); 1081 1082 return (verified == 1); 1083 } 1084 1085 static void 1086 mm_record_login(Session *s, struct passwd *pw) 1087 { 1088 socklen_t fromlen; 1089 struct sockaddr_storage from; 1090 1091 /* 1092 * Get IP address of client. If the connection is not a socket, let 1093 * the address be 0.0.0.0. 1094 */ 1095 memset(&from, 0, sizeof(from)); 1096 fromlen = sizeof(from); 1097 if (packet_connection_is_on_socket()) { 1098 if (getpeername(packet_get_connection_in(), 1099 (struct sockaddr *)&from, &fromlen) < 0) { 1100 debug("getpeername: %.100s", strerror(errno)); 1101 cleanup_exit(255); 1102 } 1103 } 1104 /* Record that there was a login on that tty from the remote host. */ 1105 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, 1106 get_remote_name_or_ip(utmp_len, options.use_dns), 1107 (struct sockaddr *)&from, fromlen); 1108 } 1109 1110 static void 1111 mm_session_close(Session *s) 1112 { 1113 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); 1114 if (s->ttyfd != -1) { 1115 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); 1116 session_pty_cleanup2(s); 1117 } 1118 session_unused(s->self); 1119 } 1120 1121 int 1122 mm_answer_pty(int sock, Buffer *m) 1123 { 1124 extern struct monitor *pmonitor; 1125 Session *s; 1126 int res, fd0; 1127 1128 debug3("%s entering", __func__); 1129 1130 buffer_clear(m); 1131 s = session_new(); 1132 if (s == NULL) 1133 goto error; 1134 s->authctxt = authctxt; 1135 s->pw = authctxt->pw; 1136 s->pid = pmonitor->m_pid; 1137 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); 1138 if (res == 0) 1139 goto error; 1140 pty_setowner(authctxt->pw, s->tty); 1141 1142 buffer_put_int(m, 1); 1143 buffer_put_cstring(m, s->tty); 1144 1145 /* We need to trick ttyslot */ 1146 if (dup2(s->ttyfd, 0) == -1) 1147 fatal("%s: dup2", __func__); 1148 1149 mm_record_login(s, authctxt->pw); 1150 1151 /* Now we can close the file descriptor again */ 1152 close(0); 1153 1154 /* send messages generated by record_login */ 1155 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); 1156 buffer_clear(&loginmsg); 1157 1158 mm_request_send(sock, MONITOR_ANS_PTY, m); 1159 1160 if (mm_send_fd(sock, s->ptyfd) == -1 || 1161 mm_send_fd(sock, s->ttyfd) == -1) 1162 fatal("%s: send fds failed", __func__); 1163 1164 /* make sure nothing uses fd 0 */ 1165 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) 1166 fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); 1167 if (fd0 != 0) 1168 error("%s: fd0 %d != 0", __func__, fd0); 1169 1170 /* slave is not needed */ 1171 close(s->ttyfd); 1172 s->ttyfd = s->ptyfd; 1173 /* no need to dup() because nobody closes ptyfd */ 1174 s->ptymaster = s->ptyfd; 1175 1176 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); 1177 1178 return (0); 1179 1180 error: 1181 if (s != NULL) 1182 mm_session_close(s); 1183 buffer_put_int(m, 0); 1184 mm_request_send(sock, MONITOR_ANS_PTY, m); 1185 return (0); 1186 } 1187 1188 int 1189 mm_answer_pty_cleanup(int sock, Buffer *m) 1190 { 1191 Session *s; 1192 char *tty; 1193 1194 debug3("%s entering", __func__); 1195 1196 tty = buffer_get_string(m, NULL); 1197 if ((s = session_by_tty(tty)) != NULL) 1198 mm_session_close(s); 1199 buffer_clear(m); 1200 xfree(tty); 1201 return (0); 1202 } 1203 1204 int 1205 mm_answer_sesskey(int sock, Buffer *m) 1206 { 1207 BIGNUM *p; 1208 int rsafail; 1209 1210 /* Turn off permissions */ 1211 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); 1212 1213 if ((p = BN_new()) == NULL) 1214 fatal("%s: BN_new", __func__); 1215 1216 buffer_get_bignum2(m, p); 1217 1218 rsafail = ssh1_session_key(p); 1219 1220 buffer_clear(m); 1221 buffer_put_int(m, rsafail); 1222 buffer_put_bignum2(m, p); 1223 1224 BN_clear_free(p); 1225 1226 mm_request_send(sock, MONITOR_ANS_SESSKEY, m); 1227 1228 /* Turn on permissions for sessid passing */ 1229 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); 1230 1231 return (0); 1232 } 1233 1234 int 1235 mm_answer_sessid(int sock, Buffer *m) 1236 { 1237 int i; 1238 1239 debug3("%s entering", __func__); 1240 1241 if (buffer_len(m) != 16) 1242 fatal("%s: bad ssh1 session id", __func__); 1243 for (i = 0; i < 16; i++) 1244 session_id[i] = buffer_get_char(m); 1245 1246 /* Turn on permissions for getpwnam */ 1247 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 1248 1249 return (0); 1250 } 1251 1252 int 1253 mm_answer_rsa_keyallowed(int sock, Buffer *m) 1254 { 1255 BIGNUM *client_n; 1256 Key *key = NULL; 1257 u_char *blob = NULL; 1258 u_int blen = 0; 1259 int allowed = 0; 1260 1261 debug3("%s entering", __func__); 1262 1263 auth_method = "rsa"; 1264 if (options.rsa_authentication && authctxt->valid) { 1265 if ((client_n = BN_new()) == NULL) 1266 fatal("%s: BN_new", __func__); 1267 buffer_get_bignum2(m, client_n); 1268 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); 1269 BN_clear_free(client_n); 1270 } 1271 buffer_clear(m); 1272 buffer_put_int(m, allowed); 1273 buffer_put_int(m, forced_command != NULL); 1274 1275 /* clear temporarily storage (used by generate challenge) */ 1276 monitor_reset_key_state(); 1277 1278 if (allowed && key != NULL) { 1279 key->type = KEY_RSA; /* cheat for key_to_blob */ 1280 if (key_to_blob(key, &blob, &blen) == 0) 1281 fatal("%s: key_to_blob failed", __func__); 1282 buffer_put_string(m, blob, blen); 1283 1284 /* Save temporarily for comparison in verify */ 1285 key_blob = blob; 1286 key_bloblen = blen; 1287 key_blobtype = MM_RSAUSERKEY; 1288 } 1289 if (key != NULL) 1290 key_free(key); 1291 1292 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); 1293 1294 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 1295 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); 1296 return (0); 1297 } 1298 1299 int 1300 mm_answer_rsa_challenge(int sock, Buffer *m) 1301 { 1302 Key *key = NULL; 1303 u_char *blob; 1304 u_int blen; 1305 1306 debug3("%s entering", __func__); 1307 1308 if (!authctxt->valid) 1309 fatal("%s: authctxt not valid", __func__); 1310 blob = buffer_get_string(m, &blen); 1311 if (!monitor_allowed_key(blob, blen)) 1312 fatal("%s: bad key, not previously allowed", __func__); 1313 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1314 fatal("%s: key type mismatch", __func__); 1315 if ((key = key_from_blob(blob, blen)) == NULL) 1316 fatal("%s: received bad key", __func__); 1317 if (key->type != KEY_RSA) 1318 fatal("%s: received bad key type %d", __func__, key->type); 1319 key->type = KEY_RSA1; 1320 if (ssh1_challenge) 1321 BN_clear_free(ssh1_challenge); 1322 ssh1_challenge = auth_rsa_generate_challenge(key); 1323 1324 buffer_clear(m); 1325 buffer_put_bignum2(m, ssh1_challenge); 1326 1327 debug3("%s sending reply", __func__); 1328 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); 1329 1330 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); 1331 1332 xfree(blob); 1333 key_free(key); 1334 return (0); 1335 } 1336 1337 int 1338 mm_answer_rsa_response(int sock, Buffer *m) 1339 { 1340 Key *key = NULL; 1341 u_char *blob, *response; 1342 u_int blen, len; 1343 int success; 1344 1345 debug3("%s entering", __func__); 1346 1347 if (!authctxt->valid) 1348 fatal("%s: authctxt not valid", __func__); 1349 if (ssh1_challenge == NULL) 1350 fatal("%s: no ssh1_challenge", __func__); 1351 1352 blob = buffer_get_string(m, &blen); 1353 if (!monitor_allowed_key(blob, blen)) 1354 fatal("%s: bad key, not previously allowed", __func__); 1355 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1356 fatal("%s: key type mismatch: %d", __func__, key_blobtype); 1357 if ((key = key_from_blob(blob, blen)) == NULL) 1358 fatal("%s: received bad key", __func__); 1359 response = buffer_get_string(m, &len); 1360 if (len != 16) 1361 fatal("%s: received bad response to challenge", __func__); 1362 success = auth_rsa_verify_response(key, ssh1_challenge, response); 1363 1364 xfree(blob); 1365 key_free(key); 1366 xfree(response); 1367 1368 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; 1369 1370 /* reset state */ 1371 BN_clear_free(ssh1_challenge); 1372 ssh1_challenge = NULL; 1373 monitor_reset_key_state(); 1374 1375 buffer_clear(m); 1376 buffer_put_int(m, success); 1377 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); 1378 1379 return (success); 1380 } 1381 1382 int 1383 mm_answer_term(int sock, Buffer *req) 1384 { 1385 extern struct monitor *pmonitor; 1386 int res, status; 1387 1388 debug3("%s: tearing down sessions", __func__); 1389 1390 /* The child is terminating */ 1391 session_destroy_all(&mm_session_close); 1392 1393 while (waitpid(pmonitor->m_pid, &status, 0) == -1) 1394 if (errno != EINTR) 1395 exit(1); 1396 1397 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; 1398 1399 /* Terminate process */ 1400 exit(res); 1401 } 1402 1403 void 1404 monitor_apply_keystate(struct monitor *pmonitor) 1405 { 1406 if (compat20) { 1407 set_newkeys(MODE_IN); 1408 set_newkeys(MODE_OUT); 1409 } else { 1410 packet_set_protocol_flags(child_state.ssh1protoflags); 1411 packet_set_encryption_key(child_state.ssh1key, 1412 child_state.ssh1keylen, child_state.ssh1cipher); 1413 xfree(child_state.ssh1key); 1414 } 1415 1416 /* for rc4 and other stateful ciphers */ 1417 packet_set_keycontext(MODE_OUT, child_state.keyout); 1418 xfree(child_state.keyout); 1419 packet_set_keycontext(MODE_IN, child_state.keyin); 1420 xfree(child_state.keyin); 1421 1422 if (!compat20) { 1423 packet_set_iv(MODE_OUT, child_state.ivout); 1424 xfree(child_state.ivout); 1425 packet_set_iv(MODE_IN, child_state.ivin); 1426 xfree(child_state.ivin); 1427 } 1428 1429 memcpy(&incoming_stream, &child_state.incoming, 1430 sizeof(incoming_stream)); 1431 memcpy(&outgoing_stream, &child_state.outgoing, 1432 sizeof(outgoing_stream)); 1433 1434 /* Update with new address */ 1435 if (options.compression) 1436 mm_init_compression(pmonitor->m_zlib); 1437 1438 /* Network I/O buffers */ 1439 /* XXX inefficient for large buffers, need: buffer_init_from_string */ 1440 buffer_clear(packet_get_input()); 1441 buffer_append(packet_get_input(), child_state.input, child_state.ilen); 1442 memset(child_state.input, 0, child_state.ilen); 1443 xfree(child_state.input); 1444 1445 buffer_clear(packet_get_output()); 1446 buffer_append(packet_get_output(), child_state.output, 1447 child_state.olen); 1448 memset(child_state.output, 0, child_state.olen); 1449 xfree(child_state.output); 1450 1451 /* Roaming */ 1452 if (compat20) 1453 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes); 1454 } 1455 1456 static Kex * 1457 mm_get_kex(Buffer *m) 1458 { 1459 Kex *kex; 1460 void *blob; 1461 u_int bloblen; 1462 1463 kex = xcalloc(1, sizeof(*kex)); 1464 kex->session_id = buffer_get_string(m, &kex->session_id_len); 1465 if (session_id2 == NULL || 1466 kex->session_id_len != session_id2_len || 1467 timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0) 1468 fatal("mm_get_get: internal error: bad session id"); 1469 kex->we_need = buffer_get_int(m); 1470 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; 1471 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; 1472 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; 1473 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; 1474 kex->kex[KEX_ECDH_SHA2] = kexecdh_server; 1475 kex->server = 1; 1476 kex->hostkey_type = buffer_get_int(m); 1477 kex->kex_type = buffer_get_int(m); 1478 blob = buffer_get_string(m, &bloblen); 1479 buffer_init(&kex->my); 1480 buffer_append(&kex->my, blob, bloblen); 1481 xfree(blob); 1482 blob = buffer_get_string(m, &bloblen); 1483 buffer_init(&kex->peer); 1484 buffer_append(&kex->peer, blob, bloblen); 1485 xfree(blob); 1486 kex->done = 1; 1487 kex->flags = buffer_get_int(m); 1488 kex->client_version_string = buffer_get_string(m, NULL); 1489 kex->server_version_string = buffer_get_string(m, NULL); 1490 kex->load_host_public_key=&get_hostkey_public_by_type; 1491 kex->load_host_private_key=&get_hostkey_private_by_type; 1492 kex->host_key_index=&get_hostkey_index; 1493 1494 return (kex); 1495 } 1496 1497 /* This function requries careful sanity checking */ 1498 1499 void 1500 mm_get_keystate(struct monitor *pmonitor) 1501 { 1502 Buffer m; 1503 u_char *blob, *p; 1504 u_int bloblen, plen; 1505 u_int32_t seqnr, packets; 1506 u_int64_t blocks, bytes; 1507 1508 debug3("%s: Waiting for new keys", __func__); 1509 1510 buffer_init(&m); 1511 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); 1512 if (!compat20) { 1513 child_state.ssh1protoflags = buffer_get_int(&m); 1514 child_state.ssh1cipher = buffer_get_int(&m); 1515 child_state.ssh1key = buffer_get_string(&m, 1516 &child_state.ssh1keylen); 1517 child_state.ivout = buffer_get_string(&m, 1518 &child_state.ivoutlen); 1519 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); 1520 goto skip; 1521 } else { 1522 /* Get the Kex for rekeying */ 1523 *pmonitor->m_pkex = mm_get_kex(&m); 1524 } 1525 1526 blob = buffer_get_string(&m, &bloblen); 1527 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); 1528 xfree(blob); 1529 1530 debug3("%s: Waiting for second key", __func__); 1531 blob = buffer_get_string(&m, &bloblen); 1532 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); 1533 xfree(blob); 1534 1535 /* Now get sequence numbers for the packets */ 1536 seqnr = buffer_get_int(&m); 1537 blocks = buffer_get_int64(&m); 1538 packets = buffer_get_int(&m); 1539 bytes = buffer_get_int64(&m); 1540 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes); 1541 seqnr = buffer_get_int(&m); 1542 blocks = buffer_get_int64(&m); 1543 packets = buffer_get_int(&m); 1544 bytes = buffer_get_int64(&m); 1545 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes); 1546 1547 skip: 1548 /* Get the key context */ 1549 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); 1550 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); 1551 1552 debug3("%s: Getting compression state", __func__); 1553 /* Get compression state */ 1554 p = buffer_get_string(&m, &plen); 1555 if (plen != sizeof(child_state.outgoing)) 1556 fatal("%s: bad request size", __func__); 1557 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); 1558 xfree(p); 1559 1560 p = buffer_get_string(&m, &plen); 1561 if (plen != sizeof(child_state.incoming)) 1562 fatal("%s: bad request size", __func__); 1563 memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); 1564 xfree(p); 1565 1566 /* Network I/O buffers */ 1567 debug3("%s: Getting Network I/O buffers", __func__); 1568 child_state.input = buffer_get_string(&m, &child_state.ilen); 1569 child_state.output = buffer_get_string(&m, &child_state.olen); 1570 1571 /* Roaming */ 1572 if (compat20) { 1573 child_state.sent_bytes = buffer_get_int64(&m); 1574 child_state.recv_bytes = buffer_get_int64(&m); 1575 } 1576 1577 buffer_free(&m); 1578 } 1579 1580 1581 /* Allocation functions for zlib */ 1582 void * 1583 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) 1584 { 1585 size_t len = (size_t) size * ncount; 1586 void *address; 1587 1588 if (len == 0 || ncount > SIZE_T_MAX / size) 1589 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); 1590 1591 address = mm_malloc(mm, len); 1592 1593 return (address); 1594 } 1595 1596 void 1597 mm_zfree(struct mm_master *mm, void *address) 1598 { 1599 mm_free(mm, address); 1600 } 1601 1602 void 1603 mm_init_compression(struct mm_master *mm) 1604 { 1605 outgoing_stream.zalloc = (alloc_func)mm_zalloc; 1606 outgoing_stream.zfree = (free_func)mm_zfree; 1607 outgoing_stream.opaque = mm; 1608 1609 incoming_stream.zalloc = (alloc_func)mm_zalloc; 1610 incoming_stream.zfree = (free_func)mm_zfree; 1611 incoming_stream.opaque = mm; 1612 } 1613 1614 /* XXX */ 1615 1616 #define FD_CLOSEONEXEC(x) do { \ 1617 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \ 1618 fatal("fcntl(%d, F_SETFD)", x); \ 1619 } while (0) 1620 1621 static void 1622 monitor_openfds(struct monitor *mon, int do_logfds) 1623 { 1624 int pair[2]; 1625 1626 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) 1627 fatal("%s: socketpair: %s", __func__, strerror(errno)); 1628 FD_CLOSEONEXEC(pair[0]); 1629 FD_CLOSEONEXEC(pair[1]); 1630 mon->m_recvfd = pair[0]; 1631 mon->m_sendfd = pair[1]; 1632 1633 if (do_logfds) { 1634 if (pipe(pair) == -1) 1635 fatal("%s: pipe: %s", __func__, strerror(errno)); 1636 FD_CLOSEONEXEC(pair[0]); 1637 FD_CLOSEONEXEC(pair[1]); 1638 mon->m_log_recvfd = pair[0]; 1639 mon->m_log_sendfd = pair[1]; 1640 } else 1641 mon->m_log_recvfd = mon->m_log_sendfd = -1; 1642 } 1643 1644 #define MM_MEMSIZE 65536 1645 1646 struct monitor * 1647 monitor_init(void) 1648 { 1649 struct monitor *mon; 1650 1651 mon = xcalloc(1, sizeof(*mon)); 1652 1653 monitor_openfds(mon, 1); 1654 1655 /* Used to share zlib space across processes */ 1656 if (options.compression) { 1657 mon->m_zback = mm_create(NULL, MM_MEMSIZE); 1658 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); 1659 1660 /* Compression needs to share state across borders */ 1661 mm_init_compression(mon->m_zlib); 1662 } 1663 1664 return mon; 1665 } 1666 1667 void 1668 monitor_reinit(struct monitor *mon) 1669 { 1670 monitor_openfds(mon, 0); 1671 } 1672 1673 #ifdef GSSAPI 1674 int 1675 mm_answer_gss_setup_ctx(int sock, Buffer *m) 1676 { 1677 gss_OID_desc goid; 1678 OM_uint32 major; 1679 u_int len; 1680 1681 goid.elements = buffer_get_string(m, &len); 1682 goid.length = len; 1683 1684 major = ssh_gssapi_server_ctx(&gsscontext, &goid); 1685 1686 xfree(goid.elements); 1687 1688 buffer_clear(m); 1689 buffer_put_int(m, major); 1690 1691 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); 1692 1693 /* Now we have a context, enable the step */ 1694 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); 1695 1696 return (0); 1697 } 1698 1699 int 1700 mm_answer_gss_accept_ctx(int sock, Buffer *m) 1701 { 1702 gss_buffer_desc in; 1703 gss_buffer_desc out = GSS_C_EMPTY_BUFFER; 1704 OM_uint32 major, minor; 1705 OM_uint32 flags = 0; /* GSI needs this */ 1706 u_int len; 1707 1708 in.value = buffer_get_string(m, &len); 1709 in.length = len; 1710 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); 1711 xfree(in.value); 1712 1713 buffer_clear(m); 1714 buffer_put_int(m, major); 1715 buffer_put_string(m, out.value, out.length); 1716 buffer_put_int(m, flags); 1717 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); 1718 1719 gss_release_buffer(&minor, &out); 1720 1721 if (major == GSS_S_COMPLETE) { 1722 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); 1723 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1724 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); 1725 } 1726 return (0); 1727 } 1728 1729 int 1730 mm_answer_gss_checkmic(int sock, Buffer *m) 1731 { 1732 gss_buffer_desc gssbuf, mic; 1733 OM_uint32 ret; 1734 u_int len; 1735 1736 gssbuf.value = buffer_get_string(m, &len); 1737 gssbuf.length = len; 1738 mic.value = buffer_get_string(m, &len); 1739 mic.length = len; 1740 1741 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); 1742 1743 xfree(gssbuf.value); 1744 xfree(mic.value); 1745 1746 buffer_clear(m); 1747 buffer_put_int(m, ret); 1748 1749 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); 1750 1751 if (!GSS_ERROR(ret)) 1752 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1753 1754 return (0); 1755 } 1756 1757 int 1758 mm_answer_gss_userok(int sock, Buffer *m) 1759 { 1760 int authenticated; 1761 1762 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); 1763 1764 buffer_clear(m); 1765 buffer_put_int(m, authenticated); 1766 1767 debug3("%s: sending result %d", __func__, authenticated); 1768 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); 1769 1770 auth_method = "gssapi-with-mic"; 1771 1772 /* Monitor loop will terminate if authenticated */ 1773 return (authenticated); 1774 } 1775 #endif /* GSSAPI */ 1776 1777 #ifdef JPAKE 1778 int 1779 mm_answer_jpake_step1(int sock, Buffer *m) 1780 { 1781 struct jpake_ctx *pctx; 1782 u_char *x3_proof, *x4_proof; 1783 u_int x3_proof_len, x4_proof_len; 1784 1785 if (!options.zero_knowledge_password_authentication) 1786 fatal("zero_knowledge_password_authentication disabled"); 1787 1788 if (authctxt->jpake_ctx != NULL) 1789 fatal("%s: authctxt->jpake_ctx already set (%p)", 1790 __func__, authctxt->jpake_ctx); 1791 authctxt->jpake_ctx = pctx = jpake_new(); 1792 1793 jpake_step1(pctx->grp, 1794 &pctx->server_id, &pctx->server_id_len, 1795 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4, 1796 &x3_proof, &x3_proof_len, 1797 &x4_proof, &x4_proof_len); 1798 1799 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__)); 1800 1801 buffer_clear(m); 1802 1803 buffer_put_string(m, pctx->server_id, pctx->server_id_len); 1804 buffer_put_bignum2(m, pctx->g_x3); 1805 buffer_put_bignum2(m, pctx->g_x4); 1806 buffer_put_string(m, x3_proof, x3_proof_len); 1807 buffer_put_string(m, x4_proof, x4_proof_len); 1808 1809 debug3("%s: sending step1", __func__); 1810 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m); 1811 1812 bzero(x3_proof, x3_proof_len); 1813 bzero(x4_proof, x4_proof_len); 1814 xfree(x3_proof); 1815 xfree(x4_proof); 1816 1817 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1); 1818 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0); 1819 1820 return 0; 1821 } 1822 1823 int 1824 mm_answer_jpake_get_pwdata(int sock, Buffer *m) 1825 { 1826 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1827 char *hash_scheme, *salt; 1828 1829 if (pctx == NULL) 1830 fatal("%s: pctx == NULL", __func__); 1831 1832 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt); 1833 1834 buffer_clear(m); 1835 /* pctx->s is sensitive, not returned to slave */ 1836 buffer_put_cstring(m, hash_scheme); 1837 buffer_put_cstring(m, salt); 1838 1839 debug3("%s: sending pwdata", __func__); 1840 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m); 1841 1842 bzero(hash_scheme, strlen(hash_scheme)); 1843 bzero(salt, strlen(salt)); 1844 xfree(hash_scheme); 1845 xfree(salt); 1846 1847 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1); 1848 1849 return 0; 1850 } 1851 1852 int 1853 mm_answer_jpake_step2(int sock, Buffer *m) 1854 { 1855 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1856 u_char *x1_proof, *x2_proof, *x4_s_proof; 1857 u_int x1_proof_len, x2_proof_len, x4_s_proof_len; 1858 1859 if (pctx == NULL) 1860 fatal("%s: pctx == NULL", __func__); 1861 1862 if ((pctx->g_x1 = BN_new()) == NULL || 1863 (pctx->g_x2 = BN_new()) == NULL) 1864 fatal("%s: BN_new", __func__); 1865 buffer_get_bignum2(m, pctx->g_x1); 1866 buffer_get_bignum2(m, pctx->g_x2); 1867 pctx->client_id = buffer_get_string(m, &pctx->client_id_len); 1868 x1_proof = buffer_get_string(m, &x1_proof_len); 1869 x2_proof = buffer_get_string(m, &x2_proof_len); 1870 1871 jpake_step2(pctx->grp, pctx->s, pctx->g_x3, 1872 pctx->g_x1, pctx->g_x2, pctx->x4, 1873 pctx->client_id, pctx->client_id_len, 1874 pctx->server_id, pctx->server_id_len, 1875 x1_proof, x1_proof_len, 1876 x2_proof, x2_proof_len, 1877 &pctx->b, 1878 &x4_s_proof, &x4_s_proof_len); 1879 1880 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__)); 1881 1882 bzero(x1_proof, x1_proof_len); 1883 bzero(x2_proof, x2_proof_len); 1884 xfree(x1_proof); 1885 xfree(x2_proof); 1886 1887 buffer_clear(m); 1888 1889 buffer_put_bignum2(m, pctx->b); 1890 buffer_put_string(m, x4_s_proof, x4_s_proof_len); 1891 1892 debug3("%s: sending step2", __func__); 1893 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m); 1894 1895 bzero(x4_s_proof, x4_s_proof_len); 1896 xfree(x4_s_proof); 1897 1898 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1); 1899 1900 return 0; 1901 } 1902 1903 int 1904 mm_answer_jpake_key_confirm(int sock, Buffer *m) 1905 { 1906 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1907 u_char *x2_s_proof; 1908 u_int x2_s_proof_len; 1909 1910 if (pctx == NULL) 1911 fatal("%s: pctx == NULL", __func__); 1912 1913 if ((pctx->a = BN_new()) == NULL) 1914 fatal("%s: BN_new", __func__); 1915 buffer_get_bignum2(m, pctx->a); 1916 x2_s_proof = buffer_get_string(m, &x2_s_proof_len); 1917 1918 jpake_key_confirm(pctx->grp, pctx->s, pctx->a, 1919 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2, 1920 pctx->server_id, pctx->server_id_len, 1921 pctx->client_id, pctx->client_id_len, 1922 session_id2, session_id2_len, 1923 x2_s_proof, x2_s_proof_len, 1924 &pctx->k, 1925 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len); 1926 1927 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__)); 1928 1929 bzero(x2_s_proof, x2_s_proof_len); 1930 buffer_clear(m); 1931 1932 /* pctx->k is sensitive, not sent */ 1933 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len); 1934 1935 debug3("%s: sending confirmation hash", __func__); 1936 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m); 1937 1938 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1); 1939 1940 return 0; 1941 } 1942 1943 int 1944 mm_answer_jpake_check_confirm(int sock, Buffer *m) 1945 { 1946 int authenticated = 0; 1947 u_char *peer_confirm_hash; 1948 u_int peer_confirm_hash_len; 1949 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1950 1951 if (pctx == NULL) 1952 fatal("%s: pctx == NULL", __func__); 1953 1954 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len); 1955 1956 authenticated = jpake_check_confirm(pctx->k, 1957 pctx->client_id, pctx->client_id_len, 1958 session_id2, session_id2_len, 1959 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid; 1960 1961 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__)); 1962 1963 bzero(peer_confirm_hash, peer_confirm_hash_len); 1964 xfree(peer_confirm_hash); 1965 1966 buffer_clear(m); 1967 buffer_put_int(m, authenticated); 1968 1969 debug3("%s: sending result %d", __func__, authenticated); 1970 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m); 1971 1972 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1); 1973 1974 auth_method = "jpake-01@openssh.com"; 1975 return authenticated; 1976 } 1977 1978 #endif /* JPAKE */ 1979