1 /* $OpenBSD: monitor.c,v 1.120 2012/12/11 22:16:21 markus 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 char *auth_submethod = NULL; 167 static u_int session_id2_len = 0; 168 static u_char *session_id2 = NULL; 169 static pid_t monitor_child_pid; 170 171 struct mon_table { 172 enum monitor_reqtype type; 173 int flags; 174 int (*f)(int, Buffer *); 175 }; 176 177 #define MON_ISAUTH 0x0004 /* Required for Authentication */ 178 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ 179 #define MON_ONCE 0x0010 /* Disable after calling */ 180 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ 181 182 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) 183 184 #define MON_PERMIT 0x1000 /* Request is permitted */ 185 186 struct mon_table mon_dispatch_proto20[] = { 187 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, 188 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, 189 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, 190 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, 191 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, 192 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 193 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 194 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, 195 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, 196 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, 197 #ifdef GSSAPI 198 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, 199 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, 200 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, 201 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, 202 #endif 203 #ifdef JPAKE 204 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata}, 205 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1}, 206 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2}, 207 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm}, 208 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm}, 209 #endif 210 {0, 0, NULL} 211 }; 212 213 struct mon_table mon_dispatch_postauth20[] = { 214 {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, 215 {MONITOR_REQ_SIGN, 0, mm_answer_sign}, 216 {MONITOR_REQ_PTY, 0, mm_answer_pty}, 217 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, 218 {MONITOR_REQ_TERM, 0, mm_answer_term}, 219 {0, 0, NULL} 220 }; 221 222 struct mon_table mon_dispatch_proto15[] = { 223 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, 224 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, 225 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, 226 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 227 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, 228 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, 229 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, 230 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, 231 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 232 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, 233 {0, 0, NULL} 234 }; 235 236 struct mon_table mon_dispatch_postauth15[] = { 237 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, 238 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, 239 {MONITOR_REQ_TERM, 0, mm_answer_term}, 240 {0, 0, NULL} 241 }; 242 243 struct mon_table *mon_dispatch; 244 245 /* Specifies if a certain message is allowed at the moment */ 246 247 static void 248 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) 249 { 250 while (ent->f != NULL) { 251 if (ent->type == type) { 252 ent->flags &= ~MON_PERMIT; 253 ent->flags |= permit ? MON_PERMIT : 0; 254 return; 255 } 256 ent++; 257 } 258 } 259 260 static void 261 monitor_permit_authentications(int permit) 262 { 263 struct mon_table *ent = mon_dispatch; 264 265 while (ent->f != NULL) { 266 if (ent->flags & MON_AUTH) { 267 ent->flags &= ~MON_PERMIT; 268 ent->flags |= permit ? MON_PERMIT : 0; 269 } 270 ent++; 271 } 272 } 273 274 void 275 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) 276 { 277 struct mon_table *ent; 278 int authenticated = 0, partial = 0; 279 280 debug3("preauth child monitor started"); 281 282 close(pmonitor->m_recvfd); 283 close(pmonitor->m_log_sendfd); 284 pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1; 285 286 authctxt = _authctxt; 287 memset(authctxt, 0, sizeof(*authctxt)); 288 289 if (compat20) { 290 mon_dispatch = mon_dispatch_proto20; 291 292 /* Permit requests for moduli and signatures */ 293 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 294 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 295 } else { 296 mon_dispatch = mon_dispatch_proto15; 297 298 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); 299 } 300 301 /* The first few requests do not require asynchronous access */ 302 while (!authenticated) { 303 partial = 0; 304 auth_method = "unknown"; 305 auth_submethod = NULL; 306 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); 307 308 /* Special handling for multiple required authentications */ 309 if (options.num_auth_methods != 0) { 310 if (!compat20) 311 fatal("AuthenticationMethods is not supported" 312 "with SSH protocol 1"); 313 if (authenticated && 314 !auth2_update_methods_lists(authctxt, 315 auth_method)) { 316 debug3("%s: method %s: partial", __func__, 317 auth_method); 318 authenticated = 0; 319 partial = 1; 320 } 321 } 322 323 if (authenticated) { 324 if (!(ent->flags & MON_AUTHDECIDE)) 325 fatal("%s: unexpected authentication from %d", 326 __func__, ent->type); 327 if (authctxt->pw->pw_uid == 0 && 328 !auth_root_allowed(auth_method)) 329 authenticated = 0; 330 } 331 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { 332 auth_log(authctxt, authenticated, partial, 333 auth_method, auth_submethod, 334 compat20 ? " ssh2" : ""); 335 if (!authenticated) 336 authctxt->failures++; 337 } 338 #ifdef JPAKE 339 /* Cleanup JPAKE context after authentication */ 340 if (ent->flags & MON_AUTHDECIDE) { 341 if (authctxt->jpake_ctx != NULL) { 342 jpake_free(authctxt->jpake_ctx); 343 authctxt->jpake_ctx = NULL; 344 } 345 } 346 #endif 347 } 348 349 if (!authctxt->valid) 350 fatal("%s: authenticated invalid user", __func__); 351 if (strcmp(auth_method, "unknown") == 0) 352 fatal("%s: authentication method name unknown", __func__); 353 354 debug("%s: %s has been authenticated by privileged process", 355 __func__, authctxt->user); 356 357 mm_get_keystate(pmonitor); 358 359 /* Drain any buffered messages from the child */ 360 while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0) 361 ; 362 363 close(pmonitor->m_sendfd); 364 close(pmonitor->m_log_recvfd); 365 pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1; 366 } 367 368 static void 369 monitor_set_child_handler(pid_t pid) 370 { 371 monitor_child_pid = pid; 372 } 373 374 static void 375 monitor_child_handler(int sig) 376 { 377 kill(monitor_child_pid, sig); 378 } 379 380 void 381 monitor_child_postauth(struct monitor *pmonitor) 382 { 383 close(pmonitor->m_recvfd); 384 pmonitor->m_recvfd = -1; 385 386 monitor_set_child_handler(pmonitor->m_pid); 387 signal(SIGHUP, &monitor_child_handler); 388 signal(SIGTERM, &monitor_child_handler); 389 signal(SIGINT, &monitor_child_handler); 390 391 if (compat20) { 392 mon_dispatch = mon_dispatch_postauth20; 393 394 /* Permit requests for moduli and signatures */ 395 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 396 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 397 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 398 } else { 399 mon_dispatch = mon_dispatch_postauth15; 400 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 401 } 402 if (!no_pty_flag) { 403 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); 404 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); 405 } 406 407 for (;;) 408 monitor_read(pmonitor, mon_dispatch, NULL); 409 } 410 411 void 412 monitor_sync(struct monitor *pmonitor) 413 { 414 if (options.compression) { 415 /* The member allocation is not visible, so sync it */ 416 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); 417 } 418 } 419 420 static int 421 monitor_read_log(struct monitor *pmonitor) 422 { 423 Buffer logmsg; 424 u_int len, level; 425 char *msg; 426 427 buffer_init(&logmsg); 428 429 /* Read length */ 430 buffer_append_space(&logmsg, 4); 431 if (atomicio(read, pmonitor->m_log_recvfd, 432 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) { 433 if (errno == EPIPE) { 434 buffer_free(&logmsg); 435 debug("%s: child log fd closed", __func__); 436 close(pmonitor->m_log_recvfd); 437 pmonitor->m_log_recvfd = -1; 438 return -1; 439 } 440 fatal("%s: log fd read: %s", __func__, strerror(errno)); 441 } 442 len = buffer_get_int(&logmsg); 443 if (len <= 4 || len > 8192) 444 fatal("%s: invalid log message length %u", __func__, len); 445 446 /* Read severity, message */ 447 buffer_clear(&logmsg); 448 buffer_append_space(&logmsg, len); 449 if (atomicio(read, pmonitor->m_log_recvfd, 450 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) 451 fatal("%s: log fd read: %s", __func__, strerror(errno)); 452 453 /* Log it */ 454 level = buffer_get_int(&logmsg); 455 msg = buffer_get_string(&logmsg, NULL); 456 if (log_level_name(level) == NULL) 457 fatal("%s: invalid log level %u (corrupted message?)", 458 __func__, level); 459 do_log2(level, "%s [preauth]", msg); 460 461 buffer_free(&logmsg); 462 xfree(msg); 463 464 return 0; 465 } 466 467 int 468 monitor_read(struct monitor *pmonitor, struct mon_table *ent, 469 struct mon_table **pent) 470 { 471 Buffer m; 472 int ret; 473 u_char type; 474 struct pollfd pfd[2]; 475 476 for (;;) { 477 bzero(&pfd, sizeof(pfd)); 478 pfd[0].fd = pmonitor->m_sendfd; 479 pfd[0].events = POLLIN; 480 pfd[1].fd = pmonitor->m_log_recvfd; 481 pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN; 482 if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) { 483 if (errno == EINTR || errno == EAGAIN) 484 continue; 485 fatal("%s: poll: %s", __func__, strerror(errno)); 486 } 487 if (pfd[1].revents) { 488 /* 489 * Drain all log messages before processing next 490 * monitor request. 491 */ 492 monitor_read_log(pmonitor); 493 continue; 494 } 495 if (pfd[0].revents) 496 break; /* Continues below */ 497 } 498 499 buffer_init(&m); 500 501 mm_request_receive(pmonitor->m_sendfd, &m); 502 type = buffer_get_char(&m); 503 504 debug3("%s: checking request %d", __func__, type); 505 506 while (ent->f != NULL) { 507 if (ent->type == type) 508 break; 509 ent++; 510 } 511 512 if (ent->f != NULL) { 513 if (!(ent->flags & MON_PERMIT)) 514 fatal("%s: unpermitted request %d", __func__, 515 type); 516 ret = (*ent->f)(pmonitor->m_sendfd, &m); 517 buffer_free(&m); 518 519 /* The child may use this request only once, disable it */ 520 if (ent->flags & MON_ONCE) { 521 debug2("%s: %d used once, disabling now", __func__, 522 type); 523 ent->flags &= ~MON_PERMIT; 524 } 525 526 if (pent != NULL) 527 *pent = ent; 528 529 return ret; 530 } 531 532 fatal("%s: unsupported request: %d", __func__, type); 533 534 /* NOTREACHED */ 535 return (-1); 536 } 537 538 /* allowed key state */ 539 static int 540 monitor_allowed_key(u_char *blob, u_int bloblen) 541 { 542 /* make sure key is allowed */ 543 if (key_blob == NULL || key_bloblen != bloblen || 544 timingsafe_bcmp(key_blob, blob, key_bloblen)) 545 return (0); 546 return (1); 547 } 548 549 static void 550 monitor_reset_key_state(void) 551 { 552 /* reset state */ 553 if (key_blob != NULL) 554 xfree(key_blob); 555 if (hostbased_cuser != NULL) 556 xfree(hostbased_cuser); 557 if (hostbased_chost != NULL) 558 xfree(hostbased_chost); 559 key_blob = NULL; 560 key_bloblen = 0; 561 key_blobtype = MM_NOKEY; 562 hostbased_cuser = NULL; 563 hostbased_chost = NULL; 564 } 565 566 int 567 mm_answer_moduli(int sock, Buffer *m) 568 { 569 DH *dh; 570 int min, want, max; 571 572 min = buffer_get_int(m); 573 want = buffer_get_int(m); 574 max = buffer_get_int(m); 575 576 debug3("%s: got parameters: %d %d %d", 577 __func__, min, want, max); 578 /* We need to check here, too, in case the child got corrupted */ 579 if (max < min || want < min || max < want) 580 fatal("%s: bad parameters: %d %d %d", 581 __func__, min, want, max); 582 583 buffer_clear(m); 584 585 dh = choose_dh(min, want, max); 586 if (dh == NULL) { 587 buffer_put_char(m, 0); 588 return (0); 589 } else { 590 /* Send first bignum */ 591 buffer_put_char(m, 1); 592 buffer_put_bignum2(m, dh->p); 593 buffer_put_bignum2(m, dh->g); 594 595 DH_free(dh); 596 } 597 mm_request_send(sock, MONITOR_ANS_MODULI, m); 598 return (0); 599 } 600 601 int 602 mm_answer_sign(int sock, Buffer *m) 603 { 604 Key *key; 605 u_char *p; 606 u_char *signature; 607 u_int siglen, datlen; 608 int keyid; 609 610 debug3("%s", __func__); 611 612 keyid = buffer_get_int(m); 613 p = buffer_get_string(m, &datlen); 614 615 /* 616 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes), 617 * SHA384 (48 bytes) and SHA512 (64 bytes). 618 */ 619 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) 620 fatal("%s: data length incorrect: %u", __func__, datlen); 621 622 /* save session id, it will be passed on the first call */ 623 if (session_id2_len == 0) { 624 session_id2_len = datlen; 625 session_id2 = xmalloc(session_id2_len); 626 memcpy(session_id2, p, session_id2_len); 627 } 628 629 if ((key = get_hostkey_by_index(keyid)) == NULL) 630 fatal("%s: no hostkey from index %d", __func__, keyid); 631 if (key_sign(key, &signature, &siglen, p, datlen) < 0) 632 fatal("%s: key_sign failed", __func__); 633 634 debug3("%s: signature %p(%u)", __func__, signature, siglen); 635 636 buffer_clear(m); 637 buffer_put_string(m, signature, siglen); 638 639 xfree(p); 640 xfree(signature); 641 642 mm_request_send(sock, MONITOR_ANS_SIGN, m); 643 644 /* Turn on permissions for getpwnam */ 645 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 646 647 return (0); 648 } 649 650 /* Retrieves the password entry and also checks if the user is permitted */ 651 652 int 653 mm_answer_pwnamallow(int sock, Buffer *m) 654 { 655 char *username; 656 struct passwd *pwent; 657 int allowed = 0; 658 u_int i; 659 660 debug3("%s", __func__); 661 662 if (authctxt->attempt++ != 0) 663 fatal("%s: multiple attempts for getpwnam", __func__); 664 665 username = buffer_get_string(m, NULL); 666 667 pwent = getpwnamallow(username); 668 669 authctxt->user = xstrdup(username); 670 setproctitle("%s [priv]", pwent ? username : "unknown"); 671 xfree(username); 672 673 buffer_clear(m); 674 675 if (pwent == NULL) { 676 buffer_put_char(m, 0); 677 authctxt->pw = fakepw(); 678 goto out; 679 } 680 681 allowed = 1; 682 authctxt->pw = pwent; 683 authctxt->valid = 1; 684 685 buffer_put_char(m, 1); 686 buffer_put_string(m, pwent, sizeof(struct passwd)); 687 buffer_put_cstring(m, pwent->pw_name); 688 buffer_put_cstring(m, "*"); 689 buffer_put_cstring(m, pwent->pw_gecos); 690 buffer_put_cstring(m, pwent->pw_class); 691 buffer_put_cstring(m, pwent->pw_dir); 692 buffer_put_cstring(m, pwent->pw_shell); 693 694 out: 695 buffer_put_string(m, &options, sizeof(options)); 696 697 #define M_CP_STROPT(x) do { \ 698 if (options.x != NULL) \ 699 buffer_put_cstring(m, options.x); \ 700 } while (0) 701 #define M_CP_STRARRAYOPT(x, nx) do { \ 702 for (i = 0; i < options.nx; i++) \ 703 buffer_put_cstring(m, options.x[i]); \ 704 } while (0) 705 /* See comment in servconf.h */ 706 COPY_MATCH_STRING_OPTS(); 707 #undef M_CP_STROPT 708 #undef M_CP_STRARRAYOPT 709 710 /* Create valid auth method lists */ 711 if (compat20 && auth2_setup_methods_lists(authctxt) != 0) { 712 /* 713 * The monitor will continue long enough to let the child 714 * run to it's packet_disconnect(), but it must not allow any 715 * authentication to succeed. 716 */ 717 debug("%s: no valid authentication method lists", __func__); 718 } 719 720 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); 721 mm_request_send(sock, MONITOR_ANS_PWNAM, m); 722 723 /* For SSHv1 allow authentication now */ 724 if (!compat20) 725 monitor_permit_authentications(1); 726 else { 727 /* Allow service/style information on the auth context */ 728 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); 729 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); 730 } 731 732 return (0); 733 } 734 735 int mm_answer_auth2_read_banner(int sock, Buffer *m) 736 { 737 char *banner; 738 739 buffer_clear(m); 740 banner = auth2_read_banner(); 741 buffer_put_cstring(m, banner != NULL ? banner : ""); 742 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); 743 744 if (banner != NULL) 745 xfree(banner); 746 747 return (0); 748 } 749 750 int 751 mm_answer_authserv(int sock, Buffer *m) 752 { 753 monitor_permit_authentications(1); 754 755 authctxt->service = buffer_get_string(m, NULL); 756 authctxt->style = buffer_get_string(m, NULL); 757 debug3("%s: service=%s, style=%s", 758 __func__, authctxt->service, authctxt->style); 759 760 if (strlen(authctxt->style) == 0) { 761 xfree(authctxt->style); 762 authctxt->style = NULL; 763 } 764 765 return (0); 766 } 767 768 int 769 mm_answer_authpassword(int sock, Buffer *m) 770 { 771 static int call_count; 772 char *passwd; 773 int authenticated; 774 u_int plen; 775 776 passwd = buffer_get_string(m, &plen); 777 /* Only authenticate if the context is valid */ 778 authenticated = options.password_authentication && 779 auth_password(authctxt, passwd); 780 memset(passwd, 0, strlen(passwd)); 781 xfree(passwd); 782 783 buffer_clear(m); 784 buffer_put_int(m, authenticated); 785 786 debug3("%s: sending result %d", __func__, authenticated); 787 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); 788 789 call_count++; 790 if (plen == 0 && call_count == 1) 791 auth_method = "none"; 792 else 793 auth_method = "password"; 794 795 /* Causes monitor loop to terminate if authenticated */ 796 return (authenticated); 797 } 798 799 int 800 mm_answer_bsdauthquery(int sock, Buffer *m) 801 { 802 char *name, *infotxt; 803 u_int numprompts; 804 u_int *echo_on; 805 char **prompts; 806 u_int success; 807 808 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, 809 &prompts, &echo_on) < 0 ? 0 : 1; 810 811 buffer_clear(m); 812 buffer_put_int(m, success); 813 if (success) 814 buffer_put_cstring(m, prompts[0]); 815 816 debug3("%s: sending challenge success: %u", __func__, success); 817 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); 818 819 if (success) { 820 xfree(name); 821 xfree(infotxt); 822 xfree(prompts); 823 xfree(echo_on); 824 } 825 826 return (0); 827 } 828 829 int 830 mm_answer_bsdauthrespond(int sock, Buffer *m) 831 { 832 char *response; 833 int authok; 834 835 if (authctxt->as == 0) 836 fatal("%s: no bsd auth session", __func__); 837 838 response = buffer_get_string(m, NULL); 839 authok = options.challenge_response_authentication && 840 auth_userresponse(authctxt->as, response, 0); 841 authctxt->as = NULL; 842 debug3("%s: <%s> = <%d>", __func__, response, authok); 843 xfree(response); 844 845 buffer_clear(m); 846 buffer_put_int(m, authok); 847 848 debug3("%s: sending authenticated: %d", __func__, authok); 849 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); 850 851 if (compat20) 852 auth_method = "keyboard-interactive"; /* XXX auth_submethod */ 853 else 854 auth_method = "bsdauth"; 855 856 return (authok != 0); 857 } 858 859 int 860 mm_answer_keyallowed(int sock, Buffer *m) 861 { 862 Key *key; 863 char *cuser, *chost; 864 u_char *blob; 865 u_int bloblen; 866 enum mm_keytype type = 0; 867 int allowed = 0; 868 869 debug3("%s entering", __func__); 870 871 type = buffer_get_int(m); 872 cuser = buffer_get_string(m, NULL); 873 chost = buffer_get_string(m, NULL); 874 blob = buffer_get_string(m, &bloblen); 875 876 key = key_from_blob(blob, bloblen); 877 878 if ((compat20 && type == MM_RSAHOSTKEY) || 879 (!compat20 && type != MM_RSAHOSTKEY)) 880 fatal("%s: key type and protocol mismatch", __func__); 881 882 debug3("%s: key_from_blob: %p", __func__, key); 883 884 if (key != NULL && authctxt->valid) { 885 switch (type) { 886 case MM_USERKEY: 887 allowed = options.pubkey_authentication && 888 user_key_allowed(authctxt->pw, key); 889 auth_method = "publickey"; 890 if (options.pubkey_authentication && allowed != 1) 891 auth_clear_options(); 892 break; 893 case MM_HOSTKEY: 894 allowed = options.hostbased_authentication && 895 hostbased_key_allowed(authctxt->pw, 896 cuser, chost, key); 897 auth_method = "hostbased"; 898 break; 899 case MM_RSAHOSTKEY: 900 key->type = KEY_RSA1; /* XXX */ 901 allowed = options.rhosts_rsa_authentication && 902 auth_rhosts_rsa_key_allowed(authctxt->pw, 903 cuser, chost, key); 904 if (options.rhosts_rsa_authentication && allowed != 1) 905 auth_clear_options(); 906 auth_method = "rsa"; 907 break; 908 default: 909 fatal("%s: unknown key type %d", __func__, type); 910 break; 911 } 912 } 913 if (key != NULL) 914 key_free(key); 915 916 /* clear temporarily storage (used by verify) */ 917 monitor_reset_key_state(); 918 919 if (allowed) { 920 /* Save temporarily for comparison in verify */ 921 key_blob = blob; 922 key_bloblen = bloblen; 923 key_blobtype = type; 924 hostbased_cuser = cuser; 925 hostbased_chost = chost; 926 } else { 927 /* Log failed attempt */ 928 auth_log(authctxt, 0, 0, auth_method, NULL, 929 compat20 ? " ssh2" : ""); 930 xfree(blob); 931 xfree(cuser); 932 xfree(chost); 933 } 934 935 debug3("%s: key %p is %s", 936 __func__, key, allowed ? "allowed" : "not allowed"); 937 938 buffer_clear(m); 939 buffer_put_int(m, allowed); 940 buffer_put_int(m, forced_command != NULL); 941 942 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); 943 944 if (type == MM_RSAHOSTKEY) 945 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 946 947 return (0); 948 } 949 950 static int 951 monitor_valid_userblob(u_char *data, u_int datalen) 952 { 953 Buffer b; 954 char *p; 955 u_int len; 956 int fail = 0; 957 958 buffer_init(&b); 959 buffer_append(&b, data, datalen); 960 961 if (datafellows & SSH_OLD_SESSIONID) { 962 p = buffer_ptr(&b); 963 len = buffer_len(&b); 964 if ((session_id2 == NULL) || 965 (len < session_id2_len) || 966 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 967 fail++; 968 buffer_consume(&b, session_id2_len); 969 } else { 970 p = buffer_get_string(&b, &len); 971 if ((session_id2 == NULL) || 972 (len != session_id2_len) || 973 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 974 fail++; 975 xfree(p); 976 } 977 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 978 fail++; 979 p = buffer_get_string(&b, NULL); 980 if (strcmp(authctxt->user, p) != 0) { 981 logit("wrong user name passed to monitor: expected %s != %.100s", 982 authctxt->user, p); 983 fail++; 984 } 985 xfree(p); 986 buffer_skip_string(&b); 987 if (datafellows & SSH_BUG_PKAUTH) { 988 if (!buffer_get_char(&b)) 989 fail++; 990 } else { 991 p = buffer_get_string(&b, NULL); 992 if (strcmp("publickey", p) != 0) 993 fail++; 994 xfree(p); 995 if (!buffer_get_char(&b)) 996 fail++; 997 buffer_skip_string(&b); 998 } 999 buffer_skip_string(&b); 1000 if (buffer_len(&b) != 0) 1001 fail++; 1002 buffer_free(&b); 1003 return (fail == 0); 1004 } 1005 1006 static int 1007 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, 1008 char *chost) 1009 { 1010 Buffer b; 1011 char *p; 1012 u_int len; 1013 int fail = 0; 1014 1015 buffer_init(&b); 1016 buffer_append(&b, data, datalen); 1017 1018 p = buffer_get_string(&b, &len); 1019 if ((session_id2 == NULL) || 1020 (len != session_id2_len) || 1021 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 1022 fail++; 1023 xfree(p); 1024 1025 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 1026 fail++; 1027 p = buffer_get_string(&b, NULL); 1028 if (strcmp(authctxt->user, p) != 0) { 1029 logit("wrong user name passed to monitor: expected %s != %.100s", 1030 authctxt->user, p); 1031 fail++; 1032 } 1033 xfree(p); 1034 buffer_skip_string(&b); /* service */ 1035 p = buffer_get_string(&b, NULL); 1036 if (strcmp(p, "hostbased") != 0) 1037 fail++; 1038 xfree(p); 1039 buffer_skip_string(&b); /* pkalg */ 1040 buffer_skip_string(&b); /* pkblob */ 1041 1042 /* verify client host, strip trailing dot if necessary */ 1043 p = buffer_get_string(&b, NULL); 1044 if (((len = strlen(p)) > 0) && p[len - 1] == '.') 1045 p[len - 1] = '\0'; 1046 if (strcmp(p, chost) != 0) 1047 fail++; 1048 xfree(p); 1049 1050 /* verify client user */ 1051 p = buffer_get_string(&b, NULL); 1052 if (strcmp(p, cuser) != 0) 1053 fail++; 1054 xfree(p); 1055 1056 if (buffer_len(&b) != 0) 1057 fail++; 1058 buffer_free(&b); 1059 return (fail == 0); 1060 } 1061 1062 int 1063 mm_answer_keyverify(int sock, Buffer *m) 1064 { 1065 Key *key; 1066 u_char *signature, *data, *blob; 1067 u_int signaturelen, datalen, bloblen; 1068 int verified = 0; 1069 int valid_data = 0; 1070 1071 blob = buffer_get_string(m, &bloblen); 1072 signature = buffer_get_string(m, &signaturelen); 1073 data = buffer_get_string(m, &datalen); 1074 1075 if (hostbased_cuser == NULL || hostbased_chost == NULL || 1076 !monitor_allowed_key(blob, bloblen)) 1077 fatal("%s: bad key, not previously allowed", __func__); 1078 1079 key = key_from_blob(blob, bloblen); 1080 if (key == NULL) 1081 fatal("%s: bad public key blob", __func__); 1082 1083 switch (key_blobtype) { 1084 case MM_USERKEY: 1085 valid_data = monitor_valid_userblob(data, datalen); 1086 break; 1087 case MM_HOSTKEY: 1088 valid_data = monitor_valid_hostbasedblob(data, datalen, 1089 hostbased_cuser, hostbased_chost); 1090 break; 1091 default: 1092 valid_data = 0; 1093 break; 1094 } 1095 if (!valid_data) 1096 fatal("%s: bad signature data blob", __func__); 1097 1098 verified = key_verify(key, signature, signaturelen, data, datalen); 1099 debug3("%s: key %p signature %s", 1100 __func__, key, (verified == 1) ? "verified" : "unverified"); 1101 1102 key_free(key); 1103 xfree(blob); 1104 xfree(signature); 1105 xfree(data); 1106 1107 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; 1108 1109 monitor_reset_key_state(); 1110 1111 buffer_clear(m); 1112 buffer_put_int(m, verified); 1113 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); 1114 1115 return (verified == 1); 1116 } 1117 1118 static void 1119 mm_record_login(Session *s, struct passwd *pw) 1120 { 1121 socklen_t fromlen; 1122 struct sockaddr_storage from; 1123 1124 /* 1125 * Get IP address of client. If the connection is not a socket, let 1126 * the address be 0.0.0.0. 1127 */ 1128 memset(&from, 0, sizeof(from)); 1129 fromlen = sizeof(from); 1130 if (packet_connection_is_on_socket()) { 1131 if (getpeername(packet_get_connection_in(), 1132 (struct sockaddr *)&from, &fromlen) < 0) { 1133 debug("getpeername: %.100s", strerror(errno)); 1134 cleanup_exit(255); 1135 } 1136 } 1137 /* Record that there was a login on that tty from the remote host. */ 1138 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, 1139 get_remote_name_or_ip(utmp_len, options.use_dns), 1140 (struct sockaddr *)&from, fromlen); 1141 } 1142 1143 static void 1144 mm_session_close(Session *s) 1145 { 1146 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); 1147 if (s->ttyfd != -1) { 1148 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); 1149 session_pty_cleanup2(s); 1150 } 1151 session_unused(s->self); 1152 } 1153 1154 int 1155 mm_answer_pty(int sock, Buffer *m) 1156 { 1157 extern struct monitor *pmonitor; 1158 Session *s; 1159 int res, fd0; 1160 1161 debug3("%s entering", __func__); 1162 1163 buffer_clear(m); 1164 s = session_new(); 1165 if (s == NULL) 1166 goto error; 1167 s->authctxt = authctxt; 1168 s->pw = authctxt->pw; 1169 s->pid = pmonitor->m_pid; 1170 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); 1171 if (res == 0) 1172 goto error; 1173 pty_setowner(authctxt->pw, s->tty); 1174 1175 buffer_put_int(m, 1); 1176 buffer_put_cstring(m, s->tty); 1177 1178 /* We need to trick ttyslot */ 1179 if (dup2(s->ttyfd, 0) == -1) 1180 fatal("%s: dup2", __func__); 1181 1182 mm_record_login(s, authctxt->pw); 1183 1184 /* Now we can close the file descriptor again */ 1185 close(0); 1186 1187 /* send messages generated by record_login */ 1188 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); 1189 buffer_clear(&loginmsg); 1190 1191 mm_request_send(sock, MONITOR_ANS_PTY, m); 1192 1193 if (mm_send_fd(sock, s->ptyfd) == -1 || 1194 mm_send_fd(sock, s->ttyfd) == -1) 1195 fatal("%s: send fds failed", __func__); 1196 1197 /* make sure nothing uses fd 0 */ 1198 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) 1199 fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); 1200 if (fd0 != 0) 1201 error("%s: fd0 %d != 0", __func__, fd0); 1202 1203 /* slave is not needed */ 1204 close(s->ttyfd); 1205 s->ttyfd = s->ptyfd; 1206 /* no need to dup() because nobody closes ptyfd */ 1207 s->ptymaster = s->ptyfd; 1208 1209 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); 1210 1211 return (0); 1212 1213 error: 1214 if (s != NULL) 1215 mm_session_close(s); 1216 buffer_put_int(m, 0); 1217 mm_request_send(sock, MONITOR_ANS_PTY, m); 1218 return (0); 1219 } 1220 1221 int 1222 mm_answer_pty_cleanup(int sock, Buffer *m) 1223 { 1224 Session *s; 1225 char *tty; 1226 1227 debug3("%s entering", __func__); 1228 1229 tty = buffer_get_string(m, NULL); 1230 if ((s = session_by_tty(tty)) != NULL) 1231 mm_session_close(s); 1232 buffer_clear(m); 1233 xfree(tty); 1234 return (0); 1235 } 1236 1237 int 1238 mm_answer_sesskey(int sock, Buffer *m) 1239 { 1240 BIGNUM *p; 1241 int rsafail; 1242 1243 /* Turn off permissions */ 1244 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); 1245 1246 if ((p = BN_new()) == NULL) 1247 fatal("%s: BN_new", __func__); 1248 1249 buffer_get_bignum2(m, p); 1250 1251 rsafail = ssh1_session_key(p); 1252 1253 buffer_clear(m); 1254 buffer_put_int(m, rsafail); 1255 buffer_put_bignum2(m, p); 1256 1257 BN_clear_free(p); 1258 1259 mm_request_send(sock, MONITOR_ANS_SESSKEY, m); 1260 1261 /* Turn on permissions for sessid passing */ 1262 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); 1263 1264 return (0); 1265 } 1266 1267 int 1268 mm_answer_sessid(int sock, Buffer *m) 1269 { 1270 int i; 1271 1272 debug3("%s entering", __func__); 1273 1274 if (buffer_len(m) != 16) 1275 fatal("%s: bad ssh1 session id", __func__); 1276 for (i = 0; i < 16; i++) 1277 session_id[i] = buffer_get_char(m); 1278 1279 /* Turn on permissions for getpwnam */ 1280 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 1281 1282 return (0); 1283 } 1284 1285 int 1286 mm_answer_rsa_keyallowed(int sock, Buffer *m) 1287 { 1288 BIGNUM *client_n; 1289 Key *key = NULL; 1290 u_char *blob = NULL; 1291 u_int blen = 0; 1292 int allowed = 0; 1293 1294 debug3("%s entering", __func__); 1295 1296 auth_method = "rsa"; 1297 if (options.rsa_authentication && authctxt->valid) { 1298 if ((client_n = BN_new()) == NULL) 1299 fatal("%s: BN_new", __func__); 1300 buffer_get_bignum2(m, client_n); 1301 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); 1302 BN_clear_free(client_n); 1303 } 1304 buffer_clear(m); 1305 buffer_put_int(m, allowed); 1306 buffer_put_int(m, forced_command != NULL); 1307 1308 /* clear temporarily storage (used by generate challenge) */ 1309 monitor_reset_key_state(); 1310 1311 if (allowed && key != NULL) { 1312 key->type = KEY_RSA; /* cheat for key_to_blob */ 1313 if (key_to_blob(key, &blob, &blen) == 0) 1314 fatal("%s: key_to_blob failed", __func__); 1315 buffer_put_string(m, blob, blen); 1316 1317 /* Save temporarily for comparison in verify */ 1318 key_blob = blob; 1319 key_bloblen = blen; 1320 key_blobtype = MM_RSAUSERKEY; 1321 } 1322 if (key != NULL) 1323 key_free(key); 1324 1325 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); 1326 1327 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 1328 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); 1329 return (0); 1330 } 1331 1332 int 1333 mm_answer_rsa_challenge(int sock, Buffer *m) 1334 { 1335 Key *key = NULL; 1336 u_char *blob; 1337 u_int blen; 1338 1339 debug3("%s entering", __func__); 1340 1341 if (!authctxt->valid) 1342 fatal("%s: authctxt not valid", __func__); 1343 blob = buffer_get_string(m, &blen); 1344 if (!monitor_allowed_key(blob, blen)) 1345 fatal("%s: bad key, not previously allowed", __func__); 1346 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1347 fatal("%s: key type mismatch", __func__); 1348 if ((key = key_from_blob(blob, blen)) == NULL) 1349 fatal("%s: received bad key", __func__); 1350 if (key->type != KEY_RSA) 1351 fatal("%s: received bad key type %d", __func__, key->type); 1352 key->type = KEY_RSA1; 1353 if (ssh1_challenge) 1354 BN_clear_free(ssh1_challenge); 1355 ssh1_challenge = auth_rsa_generate_challenge(key); 1356 1357 buffer_clear(m); 1358 buffer_put_bignum2(m, ssh1_challenge); 1359 1360 debug3("%s sending reply", __func__); 1361 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); 1362 1363 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); 1364 1365 xfree(blob); 1366 key_free(key); 1367 return (0); 1368 } 1369 1370 int 1371 mm_answer_rsa_response(int sock, Buffer *m) 1372 { 1373 Key *key = NULL; 1374 u_char *blob, *response; 1375 u_int blen, len; 1376 int success; 1377 1378 debug3("%s entering", __func__); 1379 1380 if (!authctxt->valid) 1381 fatal("%s: authctxt not valid", __func__); 1382 if (ssh1_challenge == NULL) 1383 fatal("%s: no ssh1_challenge", __func__); 1384 1385 blob = buffer_get_string(m, &blen); 1386 if (!monitor_allowed_key(blob, blen)) 1387 fatal("%s: bad key, not previously allowed", __func__); 1388 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1389 fatal("%s: key type mismatch: %d", __func__, key_blobtype); 1390 if ((key = key_from_blob(blob, blen)) == NULL) 1391 fatal("%s: received bad key", __func__); 1392 response = buffer_get_string(m, &len); 1393 if (len != 16) 1394 fatal("%s: received bad response to challenge", __func__); 1395 success = auth_rsa_verify_response(key, ssh1_challenge, response); 1396 1397 xfree(blob); 1398 key_free(key); 1399 xfree(response); 1400 1401 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; 1402 1403 /* reset state */ 1404 BN_clear_free(ssh1_challenge); 1405 ssh1_challenge = NULL; 1406 monitor_reset_key_state(); 1407 1408 buffer_clear(m); 1409 buffer_put_int(m, success); 1410 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); 1411 1412 return (success); 1413 } 1414 1415 int 1416 mm_answer_term(int sock, Buffer *req) 1417 { 1418 extern struct monitor *pmonitor; 1419 int res, status; 1420 1421 debug3("%s: tearing down sessions", __func__); 1422 1423 /* The child is terminating */ 1424 session_destroy_all(&mm_session_close); 1425 1426 while (waitpid(pmonitor->m_pid, &status, 0) == -1) 1427 if (errno != EINTR) 1428 exit(1); 1429 1430 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; 1431 1432 /* Terminate process */ 1433 exit(res); 1434 } 1435 1436 void 1437 monitor_apply_keystate(struct monitor *pmonitor) 1438 { 1439 if (compat20) { 1440 set_newkeys(MODE_IN); 1441 set_newkeys(MODE_OUT); 1442 } else { 1443 packet_set_protocol_flags(child_state.ssh1protoflags); 1444 packet_set_encryption_key(child_state.ssh1key, 1445 child_state.ssh1keylen, child_state.ssh1cipher); 1446 xfree(child_state.ssh1key); 1447 } 1448 1449 /* for rc4 and other stateful ciphers */ 1450 packet_set_keycontext(MODE_OUT, child_state.keyout); 1451 xfree(child_state.keyout); 1452 packet_set_keycontext(MODE_IN, child_state.keyin); 1453 xfree(child_state.keyin); 1454 1455 if (!compat20) { 1456 packet_set_iv(MODE_OUT, child_state.ivout); 1457 xfree(child_state.ivout); 1458 packet_set_iv(MODE_IN, child_state.ivin); 1459 xfree(child_state.ivin); 1460 } 1461 1462 memcpy(&incoming_stream, &child_state.incoming, 1463 sizeof(incoming_stream)); 1464 memcpy(&outgoing_stream, &child_state.outgoing, 1465 sizeof(outgoing_stream)); 1466 1467 /* Update with new address */ 1468 if (options.compression) 1469 mm_init_compression(pmonitor->m_zlib); 1470 1471 /* Network I/O buffers */ 1472 /* XXX inefficient for large buffers, need: buffer_init_from_string */ 1473 buffer_clear(packet_get_input()); 1474 buffer_append(packet_get_input(), child_state.input, child_state.ilen); 1475 memset(child_state.input, 0, child_state.ilen); 1476 xfree(child_state.input); 1477 1478 buffer_clear(packet_get_output()); 1479 buffer_append(packet_get_output(), child_state.output, 1480 child_state.olen); 1481 memset(child_state.output, 0, child_state.olen); 1482 xfree(child_state.output); 1483 1484 /* Roaming */ 1485 if (compat20) 1486 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes); 1487 } 1488 1489 static Kex * 1490 mm_get_kex(Buffer *m) 1491 { 1492 Kex *kex; 1493 void *blob; 1494 u_int bloblen; 1495 1496 kex = xcalloc(1, sizeof(*kex)); 1497 kex->session_id = buffer_get_string(m, &kex->session_id_len); 1498 if (session_id2 == NULL || 1499 kex->session_id_len != session_id2_len || 1500 timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0) 1501 fatal("mm_get_get: internal error: bad session id"); 1502 kex->we_need = buffer_get_int(m); 1503 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; 1504 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; 1505 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; 1506 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; 1507 kex->kex[KEX_ECDH_SHA2] = kexecdh_server; 1508 kex->server = 1; 1509 kex->hostkey_type = buffer_get_int(m); 1510 kex->kex_type = buffer_get_int(m); 1511 blob = buffer_get_string(m, &bloblen); 1512 buffer_init(&kex->my); 1513 buffer_append(&kex->my, blob, bloblen); 1514 xfree(blob); 1515 blob = buffer_get_string(m, &bloblen); 1516 buffer_init(&kex->peer); 1517 buffer_append(&kex->peer, blob, bloblen); 1518 xfree(blob); 1519 kex->done = 1; 1520 kex->flags = buffer_get_int(m); 1521 kex->client_version_string = buffer_get_string(m, NULL); 1522 kex->server_version_string = buffer_get_string(m, NULL); 1523 kex->load_host_public_key=&get_hostkey_public_by_type; 1524 kex->load_host_private_key=&get_hostkey_private_by_type; 1525 kex->host_key_index=&get_hostkey_index; 1526 1527 return (kex); 1528 } 1529 1530 /* This function requries careful sanity checking */ 1531 1532 void 1533 mm_get_keystate(struct monitor *pmonitor) 1534 { 1535 Buffer m; 1536 u_char *blob, *p; 1537 u_int bloblen, plen; 1538 u_int32_t seqnr, packets; 1539 u_int64_t blocks, bytes; 1540 1541 debug3("%s: Waiting for new keys", __func__); 1542 1543 buffer_init(&m); 1544 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); 1545 if (!compat20) { 1546 child_state.ssh1protoflags = buffer_get_int(&m); 1547 child_state.ssh1cipher = buffer_get_int(&m); 1548 child_state.ssh1key = buffer_get_string(&m, 1549 &child_state.ssh1keylen); 1550 child_state.ivout = buffer_get_string(&m, 1551 &child_state.ivoutlen); 1552 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); 1553 goto skip; 1554 } else { 1555 /* Get the Kex for rekeying */ 1556 *pmonitor->m_pkex = mm_get_kex(&m); 1557 } 1558 1559 blob = buffer_get_string(&m, &bloblen); 1560 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); 1561 xfree(blob); 1562 1563 debug3("%s: Waiting for second key", __func__); 1564 blob = buffer_get_string(&m, &bloblen); 1565 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); 1566 xfree(blob); 1567 1568 /* Now get sequence numbers for the packets */ 1569 seqnr = buffer_get_int(&m); 1570 blocks = buffer_get_int64(&m); 1571 packets = buffer_get_int(&m); 1572 bytes = buffer_get_int64(&m); 1573 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes); 1574 seqnr = buffer_get_int(&m); 1575 blocks = buffer_get_int64(&m); 1576 packets = buffer_get_int(&m); 1577 bytes = buffer_get_int64(&m); 1578 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes); 1579 1580 skip: 1581 /* Get the key context */ 1582 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); 1583 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); 1584 1585 debug3("%s: Getting compression state", __func__); 1586 /* Get compression state */ 1587 p = buffer_get_string(&m, &plen); 1588 if (plen != sizeof(child_state.outgoing)) 1589 fatal("%s: bad request size", __func__); 1590 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); 1591 xfree(p); 1592 1593 p = buffer_get_string(&m, &plen); 1594 if (plen != sizeof(child_state.incoming)) 1595 fatal("%s: bad request size", __func__); 1596 memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); 1597 xfree(p); 1598 1599 /* Network I/O buffers */ 1600 debug3("%s: Getting Network I/O buffers", __func__); 1601 child_state.input = buffer_get_string(&m, &child_state.ilen); 1602 child_state.output = buffer_get_string(&m, &child_state.olen); 1603 1604 /* Roaming */ 1605 if (compat20) { 1606 child_state.sent_bytes = buffer_get_int64(&m); 1607 child_state.recv_bytes = buffer_get_int64(&m); 1608 } 1609 1610 buffer_free(&m); 1611 } 1612 1613 1614 /* Allocation functions for zlib */ 1615 void * 1616 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) 1617 { 1618 size_t len = (size_t) size * ncount; 1619 void *address; 1620 1621 if (len == 0 || ncount > SIZE_T_MAX / size) 1622 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); 1623 1624 address = mm_malloc(mm, len); 1625 1626 return (address); 1627 } 1628 1629 void 1630 mm_zfree(struct mm_master *mm, void *address) 1631 { 1632 mm_free(mm, address); 1633 } 1634 1635 void 1636 mm_init_compression(struct mm_master *mm) 1637 { 1638 outgoing_stream.zalloc = (alloc_func)mm_zalloc; 1639 outgoing_stream.zfree = (free_func)mm_zfree; 1640 outgoing_stream.opaque = mm; 1641 1642 incoming_stream.zalloc = (alloc_func)mm_zalloc; 1643 incoming_stream.zfree = (free_func)mm_zfree; 1644 incoming_stream.opaque = mm; 1645 } 1646 1647 /* XXX */ 1648 1649 #define FD_CLOSEONEXEC(x) do { \ 1650 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \ 1651 fatal("fcntl(%d, F_SETFD)", x); \ 1652 } while (0) 1653 1654 static void 1655 monitor_openfds(struct monitor *mon, int do_logfds) 1656 { 1657 int pair[2]; 1658 1659 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) 1660 fatal("%s: socketpair: %s", __func__, strerror(errno)); 1661 FD_CLOSEONEXEC(pair[0]); 1662 FD_CLOSEONEXEC(pair[1]); 1663 mon->m_recvfd = pair[0]; 1664 mon->m_sendfd = pair[1]; 1665 1666 if (do_logfds) { 1667 if (pipe(pair) == -1) 1668 fatal("%s: pipe: %s", __func__, strerror(errno)); 1669 FD_CLOSEONEXEC(pair[0]); 1670 FD_CLOSEONEXEC(pair[1]); 1671 mon->m_log_recvfd = pair[0]; 1672 mon->m_log_sendfd = pair[1]; 1673 } else 1674 mon->m_log_recvfd = mon->m_log_sendfd = -1; 1675 } 1676 1677 #define MM_MEMSIZE 65536 1678 1679 struct monitor * 1680 monitor_init(void) 1681 { 1682 struct monitor *mon; 1683 1684 mon = xcalloc(1, sizeof(*mon)); 1685 1686 monitor_openfds(mon, 1); 1687 1688 /* Used to share zlib space across processes */ 1689 if (options.compression) { 1690 mon->m_zback = mm_create(NULL, MM_MEMSIZE); 1691 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); 1692 1693 /* Compression needs to share state across borders */ 1694 mm_init_compression(mon->m_zlib); 1695 } 1696 1697 return mon; 1698 } 1699 1700 void 1701 monitor_reinit(struct monitor *mon) 1702 { 1703 monitor_openfds(mon, 0); 1704 } 1705 1706 #ifdef GSSAPI 1707 int 1708 mm_answer_gss_setup_ctx(int sock, Buffer *m) 1709 { 1710 gss_OID_desc goid; 1711 OM_uint32 major; 1712 u_int len; 1713 1714 goid.elements = buffer_get_string(m, &len); 1715 goid.length = len; 1716 1717 major = ssh_gssapi_server_ctx(&gsscontext, &goid); 1718 1719 xfree(goid.elements); 1720 1721 buffer_clear(m); 1722 buffer_put_int(m, major); 1723 1724 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); 1725 1726 /* Now we have a context, enable the step */ 1727 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); 1728 1729 return (0); 1730 } 1731 1732 int 1733 mm_answer_gss_accept_ctx(int sock, Buffer *m) 1734 { 1735 gss_buffer_desc in; 1736 gss_buffer_desc out = GSS_C_EMPTY_BUFFER; 1737 OM_uint32 major, minor; 1738 OM_uint32 flags = 0; /* GSI needs this */ 1739 u_int len; 1740 1741 in.value = buffer_get_string(m, &len); 1742 in.length = len; 1743 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); 1744 xfree(in.value); 1745 1746 buffer_clear(m); 1747 buffer_put_int(m, major); 1748 buffer_put_string(m, out.value, out.length); 1749 buffer_put_int(m, flags); 1750 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); 1751 1752 gss_release_buffer(&minor, &out); 1753 1754 if (major == GSS_S_COMPLETE) { 1755 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); 1756 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1757 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); 1758 } 1759 return (0); 1760 } 1761 1762 int 1763 mm_answer_gss_checkmic(int sock, Buffer *m) 1764 { 1765 gss_buffer_desc gssbuf, mic; 1766 OM_uint32 ret; 1767 u_int len; 1768 1769 gssbuf.value = buffer_get_string(m, &len); 1770 gssbuf.length = len; 1771 mic.value = buffer_get_string(m, &len); 1772 mic.length = len; 1773 1774 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); 1775 1776 xfree(gssbuf.value); 1777 xfree(mic.value); 1778 1779 buffer_clear(m); 1780 buffer_put_int(m, ret); 1781 1782 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); 1783 1784 if (!GSS_ERROR(ret)) 1785 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1786 1787 return (0); 1788 } 1789 1790 int 1791 mm_answer_gss_userok(int sock, Buffer *m) 1792 { 1793 int authenticated; 1794 1795 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); 1796 1797 buffer_clear(m); 1798 buffer_put_int(m, authenticated); 1799 1800 debug3("%s: sending result %d", __func__, authenticated); 1801 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); 1802 1803 auth_method = "gssapi-with-mic"; 1804 1805 /* Monitor loop will terminate if authenticated */ 1806 return (authenticated); 1807 } 1808 #endif /* GSSAPI */ 1809 1810 #ifdef JPAKE 1811 int 1812 mm_answer_jpake_step1(int sock, Buffer *m) 1813 { 1814 struct jpake_ctx *pctx; 1815 u_char *x3_proof, *x4_proof; 1816 u_int x3_proof_len, x4_proof_len; 1817 1818 if (!options.zero_knowledge_password_authentication) 1819 fatal("zero_knowledge_password_authentication disabled"); 1820 1821 if (authctxt->jpake_ctx != NULL) 1822 fatal("%s: authctxt->jpake_ctx already set (%p)", 1823 __func__, authctxt->jpake_ctx); 1824 authctxt->jpake_ctx = pctx = jpake_new(); 1825 1826 jpake_step1(pctx->grp, 1827 &pctx->server_id, &pctx->server_id_len, 1828 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4, 1829 &x3_proof, &x3_proof_len, 1830 &x4_proof, &x4_proof_len); 1831 1832 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__)); 1833 1834 buffer_clear(m); 1835 1836 buffer_put_string(m, pctx->server_id, pctx->server_id_len); 1837 buffer_put_bignum2(m, pctx->g_x3); 1838 buffer_put_bignum2(m, pctx->g_x4); 1839 buffer_put_string(m, x3_proof, x3_proof_len); 1840 buffer_put_string(m, x4_proof, x4_proof_len); 1841 1842 debug3("%s: sending step1", __func__); 1843 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m); 1844 1845 bzero(x3_proof, x3_proof_len); 1846 bzero(x4_proof, x4_proof_len); 1847 xfree(x3_proof); 1848 xfree(x4_proof); 1849 1850 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1); 1851 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0); 1852 1853 return 0; 1854 } 1855 1856 int 1857 mm_answer_jpake_get_pwdata(int sock, Buffer *m) 1858 { 1859 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1860 char *hash_scheme, *salt; 1861 1862 if (pctx == NULL) 1863 fatal("%s: pctx == NULL", __func__); 1864 1865 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt); 1866 1867 buffer_clear(m); 1868 /* pctx->s is sensitive, not returned to slave */ 1869 buffer_put_cstring(m, hash_scheme); 1870 buffer_put_cstring(m, salt); 1871 1872 debug3("%s: sending pwdata", __func__); 1873 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m); 1874 1875 bzero(hash_scheme, strlen(hash_scheme)); 1876 bzero(salt, strlen(salt)); 1877 xfree(hash_scheme); 1878 xfree(salt); 1879 1880 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1); 1881 1882 return 0; 1883 } 1884 1885 int 1886 mm_answer_jpake_step2(int sock, Buffer *m) 1887 { 1888 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1889 u_char *x1_proof, *x2_proof, *x4_s_proof; 1890 u_int x1_proof_len, x2_proof_len, x4_s_proof_len; 1891 1892 if (pctx == NULL) 1893 fatal("%s: pctx == NULL", __func__); 1894 1895 if ((pctx->g_x1 = BN_new()) == NULL || 1896 (pctx->g_x2 = BN_new()) == NULL) 1897 fatal("%s: BN_new", __func__); 1898 buffer_get_bignum2(m, pctx->g_x1); 1899 buffer_get_bignum2(m, pctx->g_x2); 1900 pctx->client_id = buffer_get_string(m, &pctx->client_id_len); 1901 x1_proof = buffer_get_string(m, &x1_proof_len); 1902 x2_proof = buffer_get_string(m, &x2_proof_len); 1903 1904 jpake_step2(pctx->grp, pctx->s, pctx->g_x3, 1905 pctx->g_x1, pctx->g_x2, pctx->x4, 1906 pctx->client_id, pctx->client_id_len, 1907 pctx->server_id, pctx->server_id_len, 1908 x1_proof, x1_proof_len, 1909 x2_proof, x2_proof_len, 1910 &pctx->b, 1911 &x4_s_proof, &x4_s_proof_len); 1912 1913 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__)); 1914 1915 bzero(x1_proof, x1_proof_len); 1916 bzero(x2_proof, x2_proof_len); 1917 xfree(x1_proof); 1918 xfree(x2_proof); 1919 1920 buffer_clear(m); 1921 1922 buffer_put_bignum2(m, pctx->b); 1923 buffer_put_string(m, x4_s_proof, x4_s_proof_len); 1924 1925 debug3("%s: sending step2", __func__); 1926 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m); 1927 1928 bzero(x4_s_proof, x4_s_proof_len); 1929 xfree(x4_s_proof); 1930 1931 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1); 1932 1933 return 0; 1934 } 1935 1936 int 1937 mm_answer_jpake_key_confirm(int sock, Buffer *m) 1938 { 1939 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1940 u_char *x2_s_proof; 1941 u_int x2_s_proof_len; 1942 1943 if (pctx == NULL) 1944 fatal("%s: pctx == NULL", __func__); 1945 1946 if ((pctx->a = BN_new()) == NULL) 1947 fatal("%s: BN_new", __func__); 1948 buffer_get_bignum2(m, pctx->a); 1949 x2_s_proof = buffer_get_string(m, &x2_s_proof_len); 1950 1951 jpake_key_confirm(pctx->grp, pctx->s, pctx->a, 1952 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2, 1953 pctx->server_id, pctx->server_id_len, 1954 pctx->client_id, pctx->client_id_len, 1955 session_id2, session_id2_len, 1956 x2_s_proof, x2_s_proof_len, 1957 &pctx->k, 1958 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len); 1959 1960 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__)); 1961 1962 bzero(x2_s_proof, x2_s_proof_len); 1963 buffer_clear(m); 1964 1965 /* pctx->k is sensitive, not sent */ 1966 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len); 1967 1968 debug3("%s: sending confirmation hash", __func__); 1969 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m); 1970 1971 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1); 1972 1973 return 0; 1974 } 1975 1976 int 1977 mm_answer_jpake_check_confirm(int sock, Buffer *m) 1978 { 1979 int authenticated = 0; 1980 u_char *peer_confirm_hash; 1981 u_int peer_confirm_hash_len; 1982 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1983 1984 if (pctx == NULL) 1985 fatal("%s: pctx == NULL", __func__); 1986 1987 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len); 1988 1989 authenticated = jpake_check_confirm(pctx->k, 1990 pctx->client_id, pctx->client_id_len, 1991 session_id2, session_id2_len, 1992 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid; 1993 1994 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__)); 1995 1996 bzero(peer_confirm_hash, peer_confirm_hash_len); 1997 xfree(peer_confirm_hash); 1998 1999 buffer_clear(m); 2000 buffer_put_int(m, authenticated); 2001 2002 debug3("%s: sending result %d", __func__, authenticated); 2003 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m); 2004 2005 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1); 2006 2007 auth_method = "jpake-01@openssh.com"; 2008 return authenticated; 2009 } 2010 2011 #endif /* JPAKE */ 2012