1 /* $OpenBSD: monitor.c,v 1.125 2013/05/19 02:42:42 djm Exp $ */ 2 /* 3 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 4 * Copyright 2002 Markus Friedl <markus@openbsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <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, auth_submethod)) { 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 if (!authenticated) 335 authctxt->failures++; 336 } 337 #ifdef JPAKE 338 /* Cleanup JPAKE context after authentication */ 339 if (ent->flags & MON_AUTHDECIDE) { 340 if (authctxt->jpake_ctx != NULL) { 341 jpake_free(authctxt->jpake_ctx); 342 authctxt->jpake_ctx = NULL; 343 } 344 } 345 #endif 346 } 347 348 if (!authctxt->valid) 349 fatal("%s: authenticated invalid user", __func__); 350 if (strcmp(auth_method, "unknown") == 0) 351 fatal("%s: authentication method name unknown", __func__); 352 353 debug("%s: %s has been authenticated by privileged process", 354 __func__, authctxt->user); 355 356 mm_get_keystate(pmonitor); 357 358 /* Drain any buffered messages from the child */ 359 while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0) 360 ; 361 362 close(pmonitor->m_sendfd); 363 close(pmonitor->m_log_recvfd); 364 pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1; 365 } 366 367 static void 368 monitor_set_child_handler(pid_t pid) 369 { 370 monitor_child_pid = pid; 371 } 372 373 static void 374 monitor_child_handler(int sig) 375 { 376 kill(monitor_child_pid, sig); 377 } 378 379 void 380 monitor_child_postauth(struct monitor *pmonitor) 381 { 382 close(pmonitor->m_recvfd); 383 pmonitor->m_recvfd = -1; 384 385 monitor_set_child_handler(pmonitor->m_pid); 386 signal(SIGHUP, &monitor_child_handler); 387 signal(SIGTERM, &monitor_child_handler); 388 signal(SIGINT, &monitor_child_handler); 389 390 if (compat20) { 391 mon_dispatch = mon_dispatch_postauth20; 392 393 /* Permit requests for moduli and signatures */ 394 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 395 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 396 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 397 } else { 398 mon_dispatch = mon_dispatch_postauth15; 399 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 400 } 401 if (!no_pty_flag) { 402 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); 403 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); 404 } 405 406 for (;;) 407 monitor_read(pmonitor, mon_dispatch, NULL); 408 } 409 410 void 411 monitor_sync(struct monitor *pmonitor) 412 { 413 if (options.compression) { 414 /* The member allocation is not visible, so sync it */ 415 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); 416 } 417 } 418 419 static int 420 monitor_read_log(struct monitor *pmonitor) 421 { 422 Buffer logmsg; 423 u_int len, level; 424 char *msg; 425 426 buffer_init(&logmsg); 427 428 /* Read length */ 429 buffer_append_space(&logmsg, 4); 430 if (atomicio(read, pmonitor->m_log_recvfd, 431 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) { 432 if (errno == EPIPE) { 433 buffer_free(&logmsg); 434 debug("%s: child log fd closed", __func__); 435 close(pmonitor->m_log_recvfd); 436 pmonitor->m_log_recvfd = -1; 437 return -1; 438 } 439 fatal("%s: log fd read: %s", __func__, strerror(errno)); 440 } 441 len = buffer_get_int(&logmsg); 442 if (len <= 4 || len > 8192) 443 fatal("%s: invalid log message length %u", __func__, len); 444 445 /* Read severity, message */ 446 buffer_clear(&logmsg); 447 buffer_append_space(&logmsg, len); 448 if (atomicio(read, pmonitor->m_log_recvfd, 449 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) 450 fatal("%s: log fd read: %s", __func__, strerror(errno)); 451 452 /* Log it */ 453 level = buffer_get_int(&logmsg); 454 msg = buffer_get_string(&logmsg, NULL); 455 if (log_level_name(level) == NULL) 456 fatal("%s: invalid log level %u (corrupted message?)", 457 __func__, level); 458 do_log2(level, "%s [preauth]", msg); 459 460 buffer_free(&logmsg); 461 free(msg); 462 463 return 0; 464 } 465 466 int 467 monitor_read(struct monitor *pmonitor, struct mon_table *ent, 468 struct mon_table **pent) 469 { 470 Buffer m; 471 int ret; 472 u_char type; 473 struct pollfd pfd[2]; 474 475 for (;;) { 476 bzero(&pfd, sizeof(pfd)); 477 pfd[0].fd = pmonitor->m_sendfd; 478 pfd[0].events = POLLIN; 479 pfd[1].fd = pmonitor->m_log_recvfd; 480 pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN; 481 if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) { 482 if (errno == EINTR || errno == EAGAIN) 483 continue; 484 fatal("%s: poll: %s", __func__, strerror(errno)); 485 } 486 if (pfd[1].revents) { 487 /* 488 * Drain all log messages before processing next 489 * monitor request. 490 */ 491 monitor_read_log(pmonitor); 492 continue; 493 } 494 if (pfd[0].revents) 495 break; /* Continues below */ 496 } 497 498 buffer_init(&m); 499 500 mm_request_receive(pmonitor->m_sendfd, &m); 501 type = buffer_get_char(&m); 502 503 debug3("%s: checking request %d", __func__, type); 504 505 while (ent->f != NULL) { 506 if (ent->type == type) 507 break; 508 ent++; 509 } 510 511 if (ent->f != NULL) { 512 if (!(ent->flags & MON_PERMIT)) 513 fatal("%s: unpermitted request %d", __func__, 514 type); 515 ret = (*ent->f)(pmonitor->m_sendfd, &m); 516 buffer_free(&m); 517 518 /* The child may use this request only once, disable it */ 519 if (ent->flags & MON_ONCE) { 520 debug2("%s: %d used once, disabling now", __func__, 521 type); 522 ent->flags &= ~MON_PERMIT; 523 } 524 525 if (pent != NULL) 526 *pent = ent; 527 528 return ret; 529 } 530 531 fatal("%s: unsupported request: %d", __func__, type); 532 533 /* NOTREACHED */ 534 return (-1); 535 } 536 537 /* allowed key state */ 538 static int 539 monitor_allowed_key(u_char *blob, u_int bloblen) 540 { 541 /* make sure key is allowed */ 542 if (key_blob == NULL || key_bloblen != bloblen || 543 timingsafe_bcmp(key_blob, blob, key_bloblen)) 544 return (0); 545 return (1); 546 } 547 548 static void 549 monitor_reset_key_state(void) 550 { 551 /* reset state */ 552 free(key_blob); 553 free(hostbased_cuser); 554 free(hostbased_chost); 555 key_blob = NULL; 556 key_bloblen = 0; 557 key_blobtype = MM_NOKEY; 558 hostbased_cuser = NULL; 559 hostbased_chost = NULL; 560 } 561 562 int 563 mm_answer_moduli(int sock, Buffer *m) 564 { 565 DH *dh; 566 int min, want, max; 567 568 min = buffer_get_int(m); 569 want = buffer_get_int(m); 570 max = buffer_get_int(m); 571 572 debug3("%s: got parameters: %d %d %d", 573 __func__, min, want, max); 574 /* We need to check here, too, in case the child got corrupted */ 575 if (max < min || want < min || max < want) 576 fatal("%s: bad parameters: %d %d %d", 577 __func__, min, want, max); 578 579 buffer_clear(m); 580 581 dh = choose_dh(min, want, max); 582 if (dh == NULL) { 583 buffer_put_char(m, 0); 584 return (0); 585 } else { 586 /* Send first bignum */ 587 buffer_put_char(m, 1); 588 buffer_put_bignum2(m, dh->p); 589 buffer_put_bignum2(m, dh->g); 590 591 DH_free(dh); 592 } 593 mm_request_send(sock, MONITOR_ANS_MODULI, m); 594 return (0); 595 } 596 597 int 598 mm_answer_sign(int sock, Buffer *m) 599 { 600 Key *key; 601 u_char *p; 602 u_char *signature; 603 u_int siglen, datlen; 604 int keyid; 605 606 debug3("%s", __func__); 607 608 keyid = buffer_get_int(m); 609 p = buffer_get_string(m, &datlen); 610 611 /* 612 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes), 613 * SHA384 (48 bytes) and SHA512 (64 bytes). 614 */ 615 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) 616 fatal("%s: data length incorrect: %u", __func__, datlen); 617 618 /* save session id, it will be passed on the first call */ 619 if (session_id2_len == 0) { 620 session_id2_len = datlen; 621 session_id2 = xmalloc(session_id2_len); 622 memcpy(session_id2, p, session_id2_len); 623 } 624 625 if ((key = get_hostkey_by_index(keyid)) == NULL) 626 fatal("%s: no hostkey from index %d", __func__, keyid); 627 if (key_sign(key, &signature, &siglen, p, datlen) < 0) 628 fatal("%s: key_sign failed", __func__); 629 630 debug3("%s: signature %p(%u)", __func__, signature, siglen); 631 632 buffer_clear(m); 633 buffer_put_string(m, signature, siglen); 634 635 free(p); 636 free(signature); 637 638 mm_request_send(sock, MONITOR_ANS_SIGN, m); 639 640 /* Turn on permissions for getpwnam */ 641 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 642 643 return (0); 644 } 645 646 /* Retrieves the password entry and also checks if the user is permitted */ 647 648 int 649 mm_answer_pwnamallow(int sock, Buffer *m) 650 { 651 char *username; 652 struct passwd *pwent; 653 int allowed = 0; 654 u_int i; 655 656 debug3("%s", __func__); 657 658 if (authctxt->attempt++ != 0) 659 fatal("%s: multiple attempts for getpwnam", __func__); 660 661 username = buffer_get_string(m, NULL); 662 663 pwent = getpwnamallow(username); 664 665 authctxt->user = xstrdup(username); 666 setproctitle("%s [priv]", pwent ? username : "unknown"); 667 free(username); 668 669 buffer_clear(m); 670 671 if (pwent == NULL) { 672 buffer_put_char(m, 0); 673 authctxt->pw = fakepw(); 674 goto out; 675 } 676 677 allowed = 1; 678 authctxt->pw = pwent; 679 authctxt->valid = 1; 680 681 buffer_put_char(m, 1); 682 buffer_put_string(m, pwent, sizeof(struct passwd)); 683 buffer_put_cstring(m, pwent->pw_name); 684 buffer_put_cstring(m, "*"); 685 buffer_put_cstring(m, pwent->pw_gecos); 686 buffer_put_cstring(m, pwent->pw_class); 687 buffer_put_cstring(m, pwent->pw_dir); 688 buffer_put_cstring(m, pwent->pw_shell); 689 690 out: 691 buffer_put_string(m, &options, sizeof(options)); 692 693 #define M_CP_STROPT(x) do { \ 694 if (options.x != NULL) \ 695 buffer_put_cstring(m, options.x); \ 696 } while (0) 697 #define M_CP_STRARRAYOPT(x, nx) do { \ 698 for (i = 0; i < options.nx; i++) \ 699 buffer_put_cstring(m, options.x[i]); \ 700 } while (0) 701 /* See comment in servconf.h */ 702 COPY_MATCH_STRING_OPTS(); 703 #undef M_CP_STROPT 704 #undef M_CP_STRARRAYOPT 705 706 /* Create valid auth method lists */ 707 if (compat20 && auth2_setup_methods_lists(authctxt) != 0) { 708 /* 709 * The monitor will continue long enough to let the child 710 * run to it's packet_disconnect(), but it must not allow any 711 * authentication to succeed. 712 */ 713 debug("%s: no valid authentication method lists", __func__); 714 } 715 716 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); 717 mm_request_send(sock, MONITOR_ANS_PWNAM, m); 718 719 /* For SSHv1 allow authentication now */ 720 if (!compat20) 721 monitor_permit_authentications(1); 722 else { 723 /* Allow service/style information on the auth context */ 724 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); 725 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); 726 } 727 728 return (0); 729 } 730 731 int mm_answer_auth2_read_banner(int sock, Buffer *m) 732 { 733 char *banner; 734 735 buffer_clear(m); 736 banner = auth2_read_banner(); 737 buffer_put_cstring(m, banner != NULL ? banner : ""); 738 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); 739 free(banner); 740 741 return (0); 742 } 743 744 int 745 mm_answer_authserv(int sock, Buffer *m) 746 { 747 monitor_permit_authentications(1); 748 749 authctxt->service = buffer_get_string(m, NULL); 750 authctxt->style = buffer_get_string(m, NULL); 751 debug3("%s: service=%s, style=%s", 752 __func__, authctxt->service, authctxt->style); 753 754 if (strlen(authctxt->style) == 0) { 755 free(authctxt->style); 756 authctxt->style = NULL; 757 } 758 759 return (0); 760 } 761 762 int 763 mm_answer_authpassword(int sock, Buffer *m) 764 { 765 static int call_count; 766 char *passwd; 767 int authenticated; 768 u_int plen; 769 770 passwd = buffer_get_string(m, &plen); 771 /* Only authenticate if the context is valid */ 772 authenticated = options.password_authentication && 773 auth_password(authctxt, passwd); 774 memset(passwd, 0, strlen(passwd)); 775 free(passwd); 776 777 buffer_clear(m); 778 buffer_put_int(m, authenticated); 779 780 debug3("%s: sending result %d", __func__, authenticated); 781 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); 782 783 call_count++; 784 if (plen == 0 && call_count == 1) 785 auth_method = "none"; 786 else 787 auth_method = "password"; 788 789 /* Causes monitor loop to terminate if authenticated */ 790 return (authenticated); 791 } 792 793 int 794 mm_answer_bsdauthquery(int sock, Buffer *m) 795 { 796 char *name, *infotxt; 797 u_int numprompts; 798 u_int *echo_on; 799 char **prompts; 800 u_int success; 801 802 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, 803 &prompts, &echo_on) < 0 ? 0 : 1; 804 805 buffer_clear(m); 806 buffer_put_int(m, success); 807 if (success) 808 buffer_put_cstring(m, prompts[0]); 809 810 debug3("%s: sending challenge success: %u", __func__, success); 811 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); 812 813 if (success) { 814 free(name); 815 free(infotxt); 816 free(prompts); 817 free(echo_on); 818 } 819 820 return (0); 821 } 822 823 int 824 mm_answer_bsdauthrespond(int sock, Buffer *m) 825 { 826 char *response; 827 int authok; 828 829 if (authctxt->as == 0) 830 fatal("%s: no bsd auth session", __func__); 831 832 response = buffer_get_string(m, NULL); 833 authok = options.challenge_response_authentication && 834 auth_userresponse(authctxt->as, response, 0); 835 authctxt->as = NULL; 836 debug3("%s: <%s> = <%d>", __func__, response, authok); 837 free(response); 838 839 buffer_clear(m); 840 buffer_put_int(m, authok); 841 842 debug3("%s: sending authenticated: %d", __func__, authok); 843 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); 844 845 if (compat20) { 846 auth_method = "keyboard-interactive"; 847 auth_submethod = "bsdauth"; 848 } else 849 auth_method = "bsdauth"; 850 851 return (authok != 0); 852 } 853 854 int 855 mm_answer_keyallowed(int sock, Buffer *m) 856 { 857 Key *key; 858 char *cuser, *chost; 859 u_char *blob; 860 u_int bloblen; 861 enum mm_keytype type = 0; 862 int allowed = 0; 863 864 debug3("%s entering", __func__); 865 866 type = buffer_get_int(m); 867 cuser = buffer_get_string(m, NULL); 868 chost = buffer_get_string(m, NULL); 869 blob = buffer_get_string(m, &bloblen); 870 871 key = key_from_blob(blob, bloblen); 872 873 if ((compat20 && type == MM_RSAHOSTKEY) || 874 (!compat20 && type != MM_RSAHOSTKEY)) 875 fatal("%s: key type and protocol mismatch", __func__); 876 877 debug3("%s: key_from_blob: %p", __func__, key); 878 879 if (key != NULL && authctxt->valid) { 880 switch (type) { 881 case MM_USERKEY: 882 allowed = options.pubkey_authentication && 883 user_key_allowed(authctxt->pw, key); 884 pubkey_auth_info(authctxt, key); 885 auth_method = "publickey"; 886 if (options.pubkey_authentication && allowed != 1) 887 auth_clear_options(); 888 break; 889 case MM_HOSTKEY: 890 allowed = options.hostbased_authentication && 891 hostbased_key_allowed(authctxt->pw, 892 cuser, chost, key); 893 auth_method = "hostbased"; 894 break; 895 case MM_RSAHOSTKEY: 896 key->type = KEY_RSA1; /* XXX */ 897 allowed = options.rhosts_rsa_authentication && 898 auth_rhosts_rsa_key_allowed(authctxt->pw, 899 cuser, chost, key); 900 if (options.rhosts_rsa_authentication && allowed != 1) 901 auth_clear_options(); 902 auth_method = "rsa"; 903 break; 904 default: 905 fatal("%s: unknown key type %d", __func__, type); 906 break; 907 } 908 } 909 if (key != NULL) 910 key_free(key); 911 912 /* clear temporarily storage (used by verify) */ 913 monitor_reset_key_state(); 914 915 if (allowed) { 916 /* Save temporarily for comparison in verify */ 917 key_blob = blob; 918 key_bloblen = bloblen; 919 key_blobtype = type; 920 hostbased_cuser = cuser; 921 hostbased_chost = chost; 922 } else { 923 /* Log failed attempt */ 924 auth_log(authctxt, 0, 0, auth_method, NULL); 925 free(blob); 926 free(cuser); 927 free(chost); 928 } 929 930 debug3("%s: key %p is %s", 931 __func__, key, allowed ? "allowed" : "not allowed"); 932 933 buffer_clear(m); 934 buffer_put_int(m, allowed); 935 buffer_put_int(m, forced_command != NULL); 936 937 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); 938 939 if (type == MM_RSAHOSTKEY) 940 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 941 942 return (0); 943 } 944 945 static int 946 monitor_valid_userblob(u_char *data, u_int datalen) 947 { 948 Buffer b; 949 char *p, *userstyle; 950 u_int len; 951 int fail = 0; 952 953 buffer_init(&b); 954 buffer_append(&b, data, datalen); 955 956 if (datafellows & SSH_OLD_SESSIONID) { 957 p = buffer_ptr(&b); 958 len = buffer_len(&b); 959 if ((session_id2 == NULL) || 960 (len < session_id2_len) || 961 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 962 fail++; 963 buffer_consume(&b, session_id2_len); 964 } else { 965 p = buffer_get_string(&b, &len); 966 if ((session_id2 == NULL) || 967 (len != session_id2_len) || 968 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 969 fail++; 970 free(p); 971 } 972 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 973 fail++; 974 p = buffer_get_cstring(&b, NULL); 975 xasprintf(&userstyle, "%s%s%s", authctxt->user, 976 authctxt->style ? ":" : "", 977 authctxt->style ? authctxt->style : ""); 978 if (strcmp(userstyle, p) != 0) { 979 logit("wrong user name passed to monitor: expected %s != %.100s", 980 userstyle, p); 981 fail++; 982 } 983 free(userstyle); 984 free(p); 985 buffer_skip_string(&b); 986 if (datafellows & SSH_BUG_PKAUTH) { 987 if (!buffer_get_char(&b)) 988 fail++; 989 } else { 990 p = buffer_get_cstring(&b, NULL); 991 if (strcmp("publickey", p) != 0) 992 fail++; 993 free(p); 994 if (!buffer_get_char(&b)) 995 fail++; 996 buffer_skip_string(&b); 997 } 998 buffer_skip_string(&b); 999 if (buffer_len(&b) != 0) 1000 fail++; 1001 buffer_free(&b); 1002 return (fail == 0); 1003 } 1004 1005 static int 1006 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, 1007 char *chost) 1008 { 1009 Buffer b; 1010 char *p, *userstyle; 1011 u_int len; 1012 int fail = 0; 1013 1014 buffer_init(&b); 1015 buffer_append(&b, data, datalen); 1016 1017 p = buffer_get_string(&b, &len); 1018 if ((session_id2 == NULL) || 1019 (len != session_id2_len) || 1020 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 1021 fail++; 1022 free(p); 1023 1024 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 1025 fail++; 1026 p = buffer_get_cstring(&b, NULL); 1027 xasprintf(&userstyle, "%s%s%s", authctxt->user, 1028 authctxt->style ? ":" : "", 1029 authctxt->style ? authctxt->style : ""); 1030 if (strcmp(userstyle, p) != 0) { 1031 logit("wrong user name passed to monitor: expected %s != %.100s", 1032 userstyle, p); 1033 fail++; 1034 } 1035 free(userstyle); 1036 free(p); 1037 buffer_skip_string(&b); /* service */ 1038 p = buffer_get_cstring(&b, NULL); 1039 if (strcmp(p, "hostbased") != 0) 1040 fail++; 1041 free(p); 1042 buffer_skip_string(&b); /* pkalg */ 1043 buffer_skip_string(&b); /* pkblob */ 1044 1045 /* verify client host, strip trailing dot if necessary */ 1046 p = buffer_get_string(&b, NULL); 1047 if (((len = strlen(p)) > 0) && p[len - 1] == '.') 1048 p[len - 1] = '\0'; 1049 if (strcmp(p, chost) != 0) 1050 fail++; 1051 free(p); 1052 1053 /* verify client user */ 1054 p = buffer_get_string(&b, NULL); 1055 if (strcmp(p, cuser) != 0) 1056 fail++; 1057 free(p); 1058 1059 if (buffer_len(&b) != 0) 1060 fail++; 1061 buffer_free(&b); 1062 return (fail == 0); 1063 } 1064 1065 int 1066 mm_answer_keyverify(int sock, Buffer *m) 1067 { 1068 Key *key; 1069 u_char *signature, *data, *blob; 1070 u_int signaturelen, datalen, bloblen; 1071 int verified = 0; 1072 int valid_data = 0; 1073 1074 blob = buffer_get_string(m, &bloblen); 1075 signature = buffer_get_string(m, &signaturelen); 1076 data = buffer_get_string(m, &datalen); 1077 1078 if (hostbased_cuser == NULL || hostbased_chost == NULL || 1079 !monitor_allowed_key(blob, bloblen)) 1080 fatal("%s: bad key, not previously allowed", __func__); 1081 1082 key = key_from_blob(blob, bloblen); 1083 if (key == NULL) 1084 fatal("%s: bad public key blob", __func__); 1085 1086 switch (key_blobtype) { 1087 case MM_USERKEY: 1088 valid_data = monitor_valid_userblob(data, datalen); 1089 break; 1090 case MM_HOSTKEY: 1091 valid_data = monitor_valid_hostbasedblob(data, datalen, 1092 hostbased_cuser, hostbased_chost); 1093 break; 1094 default: 1095 valid_data = 0; 1096 break; 1097 } 1098 if (!valid_data) 1099 fatal("%s: bad signature data blob", __func__); 1100 1101 verified = key_verify(key, signature, signaturelen, data, datalen); 1102 debug3("%s: key %p signature %s", 1103 __func__, key, (verified == 1) ? "verified" : "unverified"); 1104 1105 key_free(key); 1106 free(blob); 1107 free(signature); 1108 free(data); 1109 1110 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; 1111 1112 monitor_reset_key_state(); 1113 1114 buffer_clear(m); 1115 buffer_put_int(m, verified); 1116 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); 1117 1118 return (verified == 1); 1119 } 1120 1121 static void 1122 mm_record_login(Session *s, struct passwd *pw) 1123 { 1124 socklen_t fromlen; 1125 struct sockaddr_storage from; 1126 1127 /* 1128 * Get IP address of client. If the connection is not a socket, let 1129 * the address be 0.0.0.0. 1130 */ 1131 memset(&from, 0, sizeof(from)); 1132 fromlen = sizeof(from); 1133 if (packet_connection_is_on_socket()) { 1134 if (getpeername(packet_get_connection_in(), 1135 (struct sockaddr *)&from, &fromlen) < 0) { 1136 debug("getpeername: %.100s", strerror(errno)); 1137 cleanup_exit(255); 1138 } 1139 } 1140 /* Record that there was a login on that tty from the remote host. */ 1141 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, 1142 get_remote_name_or_ip(utmp_len, options.use_dns), 1143 (struct sockaddr *)&from, fromlen); 1144 } 1145 1146 static void 1147 mm_session_close(Session *s) 1148 { 1149 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); 1150 if (s->ttyfd != -1) { 1151 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); 1152 session_pty_cleanup2(s); 1153 } 1154 session_unused(s->self); 1155 } 1156 1157 int 1158 mm_answer_pty(int sock, Buffer *m) 1159 { 1160 extern struct monitor *pmonitor; 1161 Session *s; 1162 int res, fd0; 1163 1164 debug3("%s entering", __func__); 1165 1166 buffer_clear(m); 1167 s = session_new(); 1168 if (s == NULL) 1169 goto error; 1170 s->authctxt = authctxt; 1171 s->pw = authctxt->pw; 1172 s->pid = pmonitor->m_pid; 1173 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); 1174 if (res == 0) 1175 goto error; 1176 pty_setowner(authctxt->pw, s->tty); 1177 1178 buffer_put_int(m, 1); 1179 buffer_put_cstring(m, s->tty); 1180 1181 /* We need to trick ttyslot */ 1182 if (dup2(s->ttyfd, 0) == -1) 1183 fatal("%s: dup2", __func__); 1184 1185 mm_record_login(s, authctxt->pw); 1186 1187 /* Now we can close the file descriptor again */ 1188 close(0); 1189 1190 /* send messages generated by record_login */ 1191 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); 1192 buffer_clear(&loginmsg); 1193 1194 mm_request_send(sock, MONITOR_ANS_PTY, m); 1195 1196 if (mm_send_fd(sock, s->ptyfd) == -1 || 1197 mm_send_fd(sock, s->ttyfd) == -1) 1198 fatal("%s: send fds failed", __func__); 1199 1200 /* make sure nothing uses fd 0 */ 1201 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) 1202 fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); 1203 if (fd0 != 0) 1204 error("%s: fd0 %d != 0", __func__, fd0); 1205 1206 /* slave is not needed */ 1207 close(s->ttyfd); 1208 s->ttyfd = s->ptyfd; 1209 /* no need to dup() because nobody closes ptyfd */ 1210 s->ptymaster = s->ptyfd; 1211 1212 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); 1213 1214 return (0); 1215 1216 error: 1217 if (s != NULL) 1218 mm_session_close(s); 1219 buffer_put_int(m, 0); 1220 mm_request_send(sock, MONITOR_ANS_PTY, m); 1221 return (0); 1222 } 1223 1224 int 1225 mm_answer_pty_cleanup(int sock, Buffer *m) 1226 { 1227 Session *s; 1228 char *tty; 1229 1230 debug3("%s entering", __func__); 1231 1232 tty = buffer_get_string(m, NULL); 1233 if ((s = session_by_tty(tty)) != NULL) 1234 mm_session_close(s); 1235 buffer_clear(m); 1236 free(tty); 1237 return (0); 1238 } 1239 1240 int 1241 mm_answer_sesskey(int sock, Buffer *m) 1242 { 1243 BIGNUM *p; 1244 int rsafail; 1245 1246 /* Turn off permissions */ 1247 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); 1248 1249 if ((p = BN_new()) == NULL) 1250 fatal("%s: BN_new", __func__); 1251 1252 buffer_get_bignum2(m, p); 1253 1254 rsafail = ssh1_session_key(p); 1255 1256 buffer_clear(m); 1257 buffer_put_int(m, rsafail); 1258 buffer_put_bignum2(m, p); 1259 1260 BN_clear_free(p); 1261 1262 mm_request_send(sock, MONITOR_ANS_SESSKEY, m); 1263 1264 /* Turn on permissions for sessid passing */ 1265 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); 1266 1267 return (0); 1268 } 1269 1270 int 1271 mm_answer_sessid(int sock, Buffer *m) 1272 { 1273 int i; 1274 1275 debug3("%s entering", __func__); 1276 1277 if (buffer_len(m) != 16) 1278 fatal("%s: bad ssh1 session id", __func__); 1279 for (i = 0; i < 16; i++) 1280 session_id[i] = buffer_get_char(m); 1281 1282 /* Turn on permissions for getpwnam */ 1283 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 1284 1285 return (0); 1286 } 1287 1288 int 1289 mm_answer_rsa_keyallowed(int sock, Buffer *m) 1290 { 1291 BIGNUM *client_n; 1292 Key *key = NULL; 1293 u_char *blob = NULL; 1294 u_int blen = 0; 1295 int allowed = 0; 1296 1297 debug3("%s entering", __func__); 1298 1299 auth_method = "rsa"; 1300 if (options.rsa_authentication && authctxt->valid) { 1301 if ((client_n = BN_new()) == NULL) 1302 fatal("%s: BN_new", __func__); 1303 buffer_get_bignum2(m, client_n); 1304 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); 1305 BN_clear_free(client_n); 1306 } 1307 buffer_clear(m); 1308 buffer_put_int(m, allowed); 1309 buffer_put_int(m, forced_command != NULL); 1310 1311 /* clear temporarily storage (used by generate challenge) */ 1312 monitor_reset_key_state(); 1313 1314 if (allowed && key != NULL) { 1315 key->type = KEY_RSA; /* cheat for key_to_blob */ 1316 if (key_to_blob(key, &blob, &blen) == 0) 1317 fatal("%s: key_to_blob failed", __func__); 1318 buffer_put_string(m, blob, blen); 1319 1320 /* Save temporarily for comparison in verify */ 1321 key_blob = blob; 1322 key_bloblen = blen; 1323 key_blobtype = MM_RSAUSERKEY; 1324 } 1325 if (key != NULL) 1326 key_free(key); 1327 1328 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); 1329 1330 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 1331 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); 1332 return (0); 1333 } 1334 1335 int 1336 mm_answer_rsa_challenge(int sock, Buffer *m) 1337 { 1338 Key *key = NULL; 1339 u_char *blob; 1340 u_int blen; 1341 1342 debug3("%s entering", __func__); 1343 1344 if (!authctxt->valid) 1345 fatal("%s: authctxt not valid", __func__); 1346 blob = buffer_get_string(m, &blen); 1347 if (!monitor_allowed_key(blob, blen)) 1348 fatal("%s: bad key, not previously allowed", __func__); 1349 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1350 fatal("%s: key type mismatch", __func__); 1351 if ((key = key_from_blob(blob, blen)) == NULL) 1352 fatal("%s: received bad key", __func__); 1353 if (key->type != KEY_RSA) 1354 fatal("%s: received bad key type %d", __func__, key->type); 1355 key->type = KEY_RSA1; 1356 if (ssh1_challenge) 1357 BN_clear_free(ssh1_challenge); 1358 ssh1_challenge = auth_rsa_generate_challenge(key); 1359 1360 buffer_clear(m); 1361 buffer_put_bignum2(m, ssh1_challenge); 1362 1363 debug3("%s sending reply", __func__); 1364 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); 1365 1366 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); 1367 1368 free(blob); 1369 key_free(key); 1370 return (0); 1371 } 1372 1373 int 1374 mm_answer_rsa_response(int sock, Buffer *m) 1375 { 1376 Key *key = NULL; 1377 u_char *blob, *response; 1378 u_int blen, len; 1379 int success; 1380 1381 debug3("%s entering", __func__); 1382 1383 if (!authctxt->valid) 1384 fatal("%s: authctxt not valid", __func__); 1385 if (ssh1_challenge == NULL) 1386 fatal("%s: no ssh1_challenge", __func__); 1387 1388 blob = buffer_get_string(m, &blen); 1389 if (!monitor_allowed_key(blob, blen)) 1390 fatal("%s: bad key, not previously allowed", __func__); 1391 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1392 fatal("%s: key type mismatch: %d", __func__, key_blobtype); 1393 if ((key = key_from_blob(blob, blen)) == NULL) 1394 fatal("%s: received bad key", __func__); 1395 response = buffer_get_string(m, &len); 1396 if (len != 16) 1397 fatal("%s: received bad response to challenge", __func__); 1398 success = auth_rsa_verify_response(key, ssh1_challenge, response); 1399 1400 free(blob); 1401 key_free(key); 1402 free(response); 1403 1404 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; 1405 1406 /* reset state */ 1407 BN_clear_free(ssh1_challenge); 1408 ssh1_challenge = NULL; 1409 monitor_reset_key_state(); 1410 1411 buffer_clear(m); 1412 buffer_put_int(m, success); 1413 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); 1414 1415 return (success); 1416 } 1417 1418 int 1419 mm_answer_term(int sock, Buffer *req) 1420 { 1421 extern struct monitor *pmonitor; 1422 int res, status; 1423 1424 debug3("%s: tearing down sessions", __func__); 1425 1426 /* The child is terminating */ 1427 session_destroy_all(&mm_session_close); 1428 1429 while (waitpid(pmonitor->m_pid, &status, 0) == -1) 1430 if (errno != EINTR) 1431 exit(1); 1432 1433 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; 1434 1435 /* Terminate process */ 1436 exit(res); 1437 } 1438 1439 void 1440 monitor_apply_keystate(struct monitor *pmonitor) 1441 { 1442 if (compat20) { 1443 set_newkeys(MODE_IN); 1444 set_newkeys(MODE_OUT); 1445 } else { 1446 packet_set_protocol_flags(child_state.ssh1protoflags); 1447 packet_set_encryption_key(child_state.ssh1key, 1448 child_state.ssh1keylen, child_state.ssh1cipher); 1449 free(child_state.ssh1key); 1450 } 1451 1452 /* for rc4 and other stateful ciphers */ 1453 packet_set_keycontext(MODE_OUT, child_state.keyout); 1454 free(child_state.keyout); 1455 packet_set_keycontext(MODE_IN, child_state.keyin); 1456 free(child_state.keyin); 1457 1458 if (!compat20) { 1459 packet_set_iv(MODE_OUT, child_state.ivout); 1460 free(child_state.ivout); 1461 packet_set_iv(MODE_IN, child_state.ivin); 1462 free(child_state.ivin); 1463 } 1464 1465 memcpy(&incoming_stream, &child_state.incoming, 1466 sizeof(incoming_stream)); 1467 memcpy(&outgoing_stream, &child_state.outgoing, 1468 sizeof(outgoing_stream)); 1469 1470 /* Update with new address */ 1471 if (options.compression) 1472 mm_init_compression(pmonitor->m_zlib); 1473 1474 if (options.rekey_limit || options.rekey_interval) 1475 packet_set_rekey_limits((u_int32_t)options.rekey_limit, 1476 (time_t)options.rekey_interval); 1477 1478 /* Network I/O buffers */ 1479 /* XXX inefficient for large buffers, need: buffer_init_from_string */ 1480 buffer_clear(packet_get_input()); 1481 buffer_append(packet_get_input(), child_state.input, child_state.ilen); 1482 memset(child_state.input, 0, child_state.ilen); 1483 free(child_state.input); 1484 1485 buffer_clear(packet_get_output()); 1486 buffer_append(packet_get_output(), child_state.output, 1487 child_state.olen); 1488 memset(child_state.output, 0, child_state.olen); 1489 free(child_state.output); 1490 1491 /* Roaming */ 1492 if (compat20) 1493 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes); 1494 } 1495 1496 static Kex * 1497 mm_get_kex(Buffer *m) 1498 { 1499 Kex *kex; 1500 void *blob; 1501 u_int bloblen; 1502 1503 kex = xcalloc(1, sizeof(*kex)); 1504 kex->session_id = buffer_get_string(m, &kex->session_id_len); 1505 if (session_id2 == NULL || 1506 kex->session_id_len != session_id2_len || 1507 timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0) 1508 fatal("mm_get_get: internal error: bad session id"); 1509 kex->we_need = buffer_get_int(m); 1510 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; 1511 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; 1512 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; 1513 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; 1514 kex->kex[KEX_ECDH_SHA2] = kexecdh_server; 1515 kex->server = 1; 1516 kex->hostkey_type = buffer_get_int(m); 1517 kex->kex_type = buffer_get_int(m); 1518 blob = buffer_get_string(m, &bloblen); 1519 buffer_init(&kex->my); 1520 buffer_append(&kex->my, blob, bloblen); 1521 free(blob); 1522 blob = buffer_get_string(m, &bloblen); 1523 buffer_init(&kex->peer); 1524 buffer_append(&kex->peer, blob, bloblen); 1525 free(blob); 1526 kex->done = 1; 1527 kex->flags = buffer_get_int(m); 1528 kex->client_version_string = buffer_get_string(m, NULL); 1529 kex->server_version_string = buffer_get_string(m, NULL); 1530 kex->load_host_public_key=&get_hostkey_public_by_type; 1531 kex->load_host_private_key=&get_hostkey_private_by_type; 1532 kex->host_key_index=&get_hostkey_index; 1533 1534 return (kex); 1535 } 1536 1537 /* This function requries careful sanity checking */ 1538 1539 void 1540 mm_get_keystate(struct monitor *pmonitor) 1541 { 1542 Buffer m; 1543 u_char *blob, *p; 1544 u_int bloblen, plen; 1545 u_int32_t seqnr, packets; 1546 u_int64_t blocks, bytes; 1547 1548 debug3("%s: Waiting for new keys", __func__); 1549 1550 buffer_init(&m); 1551 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); 1552 if (!compat20) { 1553 child_state.ssh1protoflags = buffer_get_int(&m); 1554 child_state.ssh1cipher = buffer_get_int(&m); 1555 child_state.ssh1key = buffer_get_string(&m, 1556 &child_state.ssh1keylen); 1557 child_state.ivout = buffer_get_string(&m, 1558 &child_state.ivoutlen); 1559 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); 1560 goto skip; 1561 } else { 1562 /* Get the Kex for rekeying */ 1563 *pmonitor->m_pkex = mm_get_kex(&m); 1564 } 1565 1566 blob = buffer_get_string(&m, &bloblen); 1567 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); 1568 free(blob); 1569 1570 debug3("%s: Waiting for second key", __func__); 1571 blob = buffer_get_string(&m, &bloblen); 1572 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); 1573 free(blob); 1574 1575 /* Now get sequence numbers for the packets */ 1576 seqnr = buffer_get_int(&m); 1577 blocks = buffer_get_int64(&m); 1578 packets = buffer_get_int(&m); 1579 bytes = buffer_get_int64(&m); 1580 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes); 1581 seqnr = buffer_get_int(&m); 1582 blocks = buffer_get_int64(&m); 1583 packets = buffer_get_int(&m); 1584 bytes = buffer_get_int64(&m); 1585 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes); 1586 1587 skip: 1588 /* Get the key context */ 1589 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); 1590 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); 1591 1592 debug3("%s: Getting compression state", __func__); 1593 /* Get compression state */ 1594 p = buffer_get_string(&m, &plen); 1595 if (plen != sizeof(child_state.outgoing)) 1596 fatal("%s: bad request size", __func__); 1597 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); 1598 free(p); 1599 1600 p = buffer_get_string(&m, &plen); 1601 if (plen != sizeof(child_state.incoming)) 1602 fatal("%s: bad request size", __func__); 1603 memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); 1604 free(p); 1605 1606 /* Network I/O buffers */ 1607 debug3("%s: Getting Network I/O buffers", __func__); 1608 child_state.input = buffer_get_string(&m, &child_state.ilen); 1609 child_state.output = buffer_get_string(&m, &child_state.olen); 1610 1611 /* Roaming */ 1612 if (compat20) { 1613 child_state.sent_bytes = buffer_get_int64(&m); 1614 child_state.recv_bytes = buffer_get_int64(&m); 1615 } 1616 1617 buffer_free(&m); 1618 } 1619 1620 1621 /* Allocation functions for zlib */ 1622 void * 1623 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) 1624 { 1625 size_t len = (size_t) size * ncount; 1626 void *address; 1627 1628 if (len == 0 || ncount > SIZE_T_MAX / size) 1629 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); 1630 1631 address = mm_malloc(mm, len); 1632 1633 return (address); 1634 } 1635 1636 void 1637 mm_zfree(struct mm_master *mm, void *address) 1638 { 1639 mm_free(mm, address); 1640 } 1641 1642 void 1643 mm_init_compression(struct mm_master *mm) 1644 { 1645 outgoing_stream.zalloc = (alloc_func)mm_zalloc; 1646 outgoing_stream.zfree = (free_func)mm_zfree; 1647 outgoing_stream.opaque = mm; 1648 1649 incoming_stream.zalloc = (alloc_func)mm_zalloc; 1650 incoming_stream.zfree = (free_func)mm_zfree; 1651 incoming_stream.opaque = mm; 1652 } 1653 1654 /* XXX */ 1655 1656 #define FD_CLOSEONEXEC(x) do { \ 1657 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \ 1658 fatal("fcntl(%d, F_SETFD)", x); \ 1659 } while (0) 1660 1661 static void 1662 monitor_openfds(struct monitor *mon, int do_logfds) 1663 { 1664 int pair[2]; 1665 1666 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) 1667 fatal("%s: socketpair: %s", __func__, strerror(errno)); 1668 FD_CLOSEONEXEC(pair[0]); 1669 FD_CLOSEONEXEC(pair[1]); 1670 mon->m_recvfd = pair[0]; 1671 mon->m_sendfd = pair[1]; 1672 1673 if (do_logfds) { 1674 if (pipe(pair) == -1) 1675 fatal("%s: pipe: %s", __func__, strerror(errno)); 1676 FD_CLOSEONEXEC(pair[0]); 1677 FD_CLOSEONEXEC(pair[1]); 1678 mon->m_log_recvfd = pair[0]; 1679 mon->m_log_sendfd = pair[1]; 1680 } else 1681 mon->m_log_recvfd = mon->m_log_sendfd = -1; 1682 } 1683 1684 #define MM_MEMSIZE 65536 1685 1686 struct monitor * 1687 monitor_init(void) 1688 { 1689 struct monitor *mon; 1690 1691 mon = xcalloc(1, sizeof(*mon)); 1692 1693 monitor_openfds(mon, 1); 1694 1695 /* Used to share zlib space across processes */ 1696 if (options.compression) { 1697 mon->m_zback = mm_create(NULL, MM_MEMSIZE); 1698 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); 1699 1700 /* Compression needs to share state across borders */ 1701 mm_init_compression(mon->m_zlib); 1702 } 1703 1704 return mon; 1705 } 1706 1707 void 1708 monitor_reinit(struct monitor *mon) 1709 { 1710 monitor_openfds(mon, 0); 1711 } 1712 1713 #ifdef GSSAPI 1714 int 1715 mm_answer_gss_setup_ctx(int sock, Buffer *m) 1716 { 1717 gss_OID_desc goid; 1718 OM_uint32 major; 1719 u_int len; 1720 1721 goid.elements = buffer_get_string(m, &len); 1722 goid.length = len; 1723 1724 major = ssh_gssapi_server_ctx(&gsscontext, &goid); 1725 1726 free(goid.elements); 1727 1728 buffer_clear(m); 1729 buffer_put_int(m, major); 1730 1731 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); 1732 1733 /* Now we have a context, enable the step */ 1734 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); 1735 1736 return (0); 1737 } 1738 1739 int 1740 mm_answer_gss_accept_ctx(int sock, Buffer *m) 1741 { 1742 gss_buffer_desc in; 1743 gss_buffer_desc out = GSS_C_EMPTY_BUFFER; 1744 OM_uint32 major, minor; 1745 OM_uint32 flags = 0; /* GSI needs this */ 1746 u_int len; 1747 1748 in.value = buffer_get_string(m, &len); 1749 in.length = len; 1750 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); 1751 free(in.value); 1752 1753 buffer_clear(m); 1754 buffer_put_int(m, major); 1755 buffer_put_string(m, out.value, out.length); 1756 buffer_put_int(m, flags); 1757 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); 1758 1759 gss_release_buffer(&minor, &out); 1760 1761 if (major == GSS_S_COMPLETE) { 1762 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); 1763 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1764 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); 1765 } 1766 return (0); 1767 } 1768 1769 int 1770 mm_answer_gss_checkmic(int sock, Buffer *m) 1771 { 1772 gss_buffer_desc gssbuf, mic; 1773 OM_uint32 ret; 1774 u_int len; 1775 1776 gssbuf.value = buffer_get_string(m, &len); 1777 gssbuf.length = len; 1778 mic.value = buffer_get_string(m, &len); 1779 mic.length = len; 1780 1781 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); 1782 1783 free(gssbuf.value); 1784 free(mic.value); 1785 1786 buffer_clear(m); 1787 buffer_put_int(m, ret); 1788 1789 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); 1790 1791 if (!GSS_ERROR(ret)) 1792 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1793 1794 return (0); 1795 } 1796 1797 int 1798 mm_answer_gss_userok(int sock, Buffer *m) 1799 { 1800 int authenticated; 1801 1802 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); 1803 1804 buffer_clear(m); 1805 buffer_put_int(m, authenticated); 1806 1807 debug3("%s: sending result %d", __func__, authenticated); 1808 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); 1809 1810 auth_method = "gssapi-with-mic"; 1811 1812 /* Monitor loop will terminate if authenticated */ 1813 return (authenticated); 1814 } 1815 #endif /* GSSAPI */ 1816 1817 #ifdef JPAKE 1818 int 1819 mm_answer_jpake_step1(int sock, Buffer *m) 1820 { 1821 struct jpake_ctx *pctx; 1822 u_char *x3_proof, *x4_proof; 1823 u_int x3_proof_len, x4_proof_len; 1824 1825 if (!options.zero_knowledge_password_authentication) 1826 fatal("zero_knowledge_password_authentication disabled"); 1827 1828 if (authctxt->jpake_ctx != NULL) 1829 fatal("%s: authctxt->jpake_ctx already set (%p)", 1830 __func__, authctxt->jpake_ctx); 1831 authctxt->jpake_ctx = pctx = jpake_new(); 1832 1833 jpake_step1(pctx->grp, 1834 &pctx->server_id, &pctx->server_id_len, 1835 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4, 1836 &x3_proof, &x3_proof_len, 1837 &x4_proof, &x4_proof_len); 1838 1839 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__)); 1840 1841 buffer_clear(m); 1842 1843 buffer_put_string(m, pctx->server_id, pctx->server_id_len); 1844 buffer_put_bignum2(m, pctx->g_x3); 1845 buffer_put_bignum2(m, pctx->g_x4); 1846 buffer_put_string(m, x3_proof, x3_proof_len); 1847 buffer_put_string(m, x4_proof, x4_proof_len); 1848 1849 debug3("%s: sending step1", __func__); 1850 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m); 1851 1852 bzero(x3_proof, x3_proof_len); 1853 bzero(x4_proof, x4_proof_len); 1854 free(x3_proof); 1855 free(x4_proof); 1856 1857 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1); 1858 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0); 1859 1860 return 0; 1861 } 1862 1863 int 1864 mm_answer_jpake_get_pwdata(int sock, Buffer *m) 1865 { 1866 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1867 char *hash_scheme, *salt; 1868 1869 if (pctx == NULL) 1870 fatal("%s: pctx == NULL", __func__); 1871 1872 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt); 1873 1874 buffer_clear(m); 1875 /* pctx->s is sensitive, not returned to slave */ 1876 buffer_put_cstring(m, hash_scheme); 1877 buffer_put_cstring(m, salt); 1878 1879 debug3("%s: sending pwdata", __func__); 1880 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m); 1881 1882 bzero(hash_scheme, strlen(hash_scheme)); 1883 bzero(salt, strlen(salt)); 1884 free(hash_scheme); 1885 free(salt); 1886 1887 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1); 1888 1889 return 0; 1890 } 1891 1892 int 1893 mm_answer_jpake_step2(int sock, Buffer *m) 1894 { 1895 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1896 u_char *x1_proof, *x2_proof, *x4_s_proof; 1897 u_int x1_proof_len, x2_proof_len, x4_s_proof_len; 1898 1899 if (pctx == NULL) 1900 fatal("%s: pctx == NULL", __func__); 1901 1902 if ((pctx->g_x1 = BN_new()) == NULL || 1903 (pctx->g_x2 = BN_new()) == NULL) 1904 fatal("%s: BN_new", __func__); 1905 buffer_get_bignum2(m, pctx->g_x1); 1906 buffer_get_bignum2(m, pctx->g_x2); 1907 pctx->client_id = buffer_get_string(m, &pctx->client_id_len); 1908 x1_proof = buffer_get_string(m, &x1_proof_len); 1909 x2_proof = buffer_get_string(m, &x2_proof_len); 1910 1911 jpake_step2(pctx->grp, pctx->s, pctx->g_x3, 1912 pctx->g_x1, pctx->g_x2, pctx->x4, 1913 pctx->client_id, pctx->client_id_len, 1914 pctx->server_id, pctx->server_id_len, 1915 x1_proof, x1_proof_len, 1916 x2_proof, x2_proof_len, 1917 &pctx->b, 1918 &x4_s_proof, &x4_s_proof_len); 1919 1920 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__)); 1921 1922 bzero(x1_proof, x1_proof_len); 1923 bzero(x2_proof, x2_proof_len); 1924 free(x1_proof); 1925 free(x2_proof); 1926 1927 buffer_clear(m); 1928 1929 buffer_put_bignum2(m, pctx->b); 1930 buffer_put_string(m, x4_s_proof, x4_s_proof_len); 1931 1932 debug3("%s: sending step2", __func__); 1933 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m); 1934 1935 bzero(x4_s_proof, x4_s_proof_len); 1936 free(x4_s_proof); 1937 1938 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1); 1939 1940 return 0; 1941 } 1942 1943 int 1944 mm_answer_jpake_key_confirm(int sock, Buffer *m) 1945 { 1946 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1947 u_char *x2_s_proof; 1948 u_int x2_s_proof_len; 1949 1950 if (pctx == NULL) 1951 fatal("%s: pctx == NULL", __func__); 1952 1953 if ((pctx->a = BN_new()) == NULL) 1954 fatal("%s: BN_new", __func__); 1955 buffer_get_bignum2(m, pctx->a); 1956 x2_s_proof = buffer_get_string(m, &x2_s_proof_len); 1957 1958 jpake_key_confirm(pctx->grp, pctx->s, pctx->a, 1959 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2, 1960 pctx->server_id, pctx->server_id_len, 1961 pctx->client_id, pctx->client_id_len, 1962 session_id2, session_id2_len, 1963 x2_s_proof, x2_s_proof_len, 1964 &pctx->k, 1965 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len); 1966 1967 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__)); 1968 1969 bzero(x2_s_proof, x2_s_proof_len); 1970 buffer_clear(m); 1971 1972 /* pctx->k is sensitive, not sent */ 1973 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len); 1974 1975 debug3("%s: sending confirmation hash", __func__); 1976 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m); 1977 1978 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1); 1979 1980 return 0; 1981 } 1982 1983 int 1984 mm_answer_jpake_check_confirm(int sock, Buffer *m) 1985 { 1986 int authenticated = 0; 1987 u_char *peer_confirm_hash; 1988 u_int peer_confirm_hash_len; 1989 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1990 1991 if (pctx == NULL) 1992 fatal("%s: pctx == NULL", __func__); 1993 1994 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len); 1995 1996 authenticated = jpake_check_confirm(pctx->k, 1997 pctx->client_id, pctx->client_id_len, 1998 session_id2, session_id2_len, 1999 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid; 2000 2001 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__)); 2002 2003 bzero(peer_confirm_hash, peer_confirm_hash_len); 2004 free(peer_confirm_hash); 2005 2006 buffer_clear(m); 2007 buffer_put_int(m, authenticated); 2008 2009 debug3("%s: sending result %d", __func__, authenticated); 2010 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m); 2011 2012 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1); 2013 2014 auth_method = "jpake-01@openssh.com"; 2015 return authenticated; 2016 } 2017 2018 #endif /* JPAKE */ 2019