monitor.c revision 1.127
1/* $OpenBSD: monitor.c,v 1.127 2013/07/19 07:37:48 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#include "authfd.h" 79 80#ifdef GSSAPI 81static Gssctxt *gsscontext = NULL; 82#endif 83 84/* Imports */ 85extern ServerOptions options; 86extern u_int utmp_len; 87extern Newkeys *current_keys[]; 88extern z_stream incoming_stream; 89extern z_stream outgoing_stream; 90extern u_char session_id[]; 91extern Buffer auth_debug; 92extern int auth_debug_init; 93extern Buffer loginmsg; 94 95/* State exported from the child */ 96 97struct { 98 z_stream incoming; 99 z_stream outgoing; 100 u_char *keyin; 101 u_int keyinlen; 102 u_char *keyout; 103 u_int keyoutlen; 104 u_char *ivin; 105 u_int ivinlen; 106 u_char *ivout; 107 u_int ivoutlen; 108 u_char *ssh1key; 109 u_int ssh1keylen; 110 int ssh1cipher; 111 int ssh1protoflags; 112 u_char *input; 113 u_int ilen; 114 u_char *output; 115 u_int olen; 116 u_int64_t sent_bytes; 117 u_int64_t recv_bytes; 118} child_state; 119 120/* Functions on the monitor that answer unprivileged requests */ 121 122int mm_answer_moduli(int, Buffer *); 123int mm_answer_sign(int, Buffer *); 124int mm_answer_pwnamallow(int, Buffer *); 125int mm_answer_auth2_read_banner(int, Buffer *); 126int mm_answer_authserv(int, Buffer *); 127int mm_answer_authpassword(int, Buffer *); 128int mm_answer_bsdauthquery(int, Buffer *); 129int mm_answer_bsdauthrespond(int, Buffer *); 130int mm_answer_skeyquery(int, Buffer *); 131int mm_answer_skeyrespond(int, Buffer *); 132int mm_answer_keyallowed(int, Buffer *); 133int mm_answer_keyverify(int, Buffer *); 134int mm_answer_pty(int, Buffer *); 135int mm_answer_pty_cleanup(int, Buffer *); 136int mm_answer_term(int, Buffer *); 137int mm_answer_rsa_keyallowed(int, Buffer *); 138int mm_answer_rsa_challenge(int, Buffer *); 139int mm_answer_rsa_response(int, Buffer *); 140int mm_answer_sesskey(int, Buffer *); 141int mm_answer_sessid(int, Buffer *); 142int mm_answer_jpake_get_pwdata(int, Buffer *); 143int mm_answer_jpake_step1(int, Buffer *); 144int mm_answer_jpake_step2(int, Buffer *); 145int mm_answer_jpake_key_confirm(int, Buffer *); 146int mm_answer_jpake_check_confirm(int, Buffer *); 147 148#ifdef GSSAPI 149int mm_answer_gss_setup_ctx(int, Buffer *); 150int mm_answer_gss_accept_ctx(int, Buffer *); 151int mm_answer_gss_userok(int, Buffer *); 152int mm_answer_gss_checkmic(int, Buffer *); 153#endif 154 155static int monitor_read_log(struct monitor *); 156 157static Authctxt *authctxt; 158static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ 159 160/* local state for key verify */ 161static u_char *key_blob = NULL; 162static u_int key_bloblen = 0; 163static int key_blobtype = MM_NOKEY; 164static char *hostbased_cuser = NULL; 165static char *hostbased_chost = NULL; 166static char *auth_method = "unknown"; 167static char *auth_submethod = NULL; 168static u_int session_id2_len = 0; 169static u_char *session_id2 = NULL; 170static pid_t monitor_child_pid; 171 172struct mon_table { 173 enum monitor_reqtype type; 174 int flags; 175 int (*f)(int, Buffer *); 176}; 177 178#define MON_ISAUTH 0x0004 /* Required for Authentication */ 179#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ 180#define MON_ONCE 0x0010 /* Disable after calling */ 181#define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ 182 183#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) 184 185#define MON_PERMIT 0x1000 /* Request is permitted */ 186 187struct mon_table mon_dispatch_proto20[] = { 188 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, 189 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, 190 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, 191 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, 192 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, 193 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 194 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 195 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, 196 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, 197 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, 198#ifdef GSSAPI 199 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, 200 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, 201 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, 202 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, 203#endif 204#ifdef JPAKE 205 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata}, 206 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1}, 207 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2}, 208 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm}, 209 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm}, 210#endif 211 {0, 0, NULL} 212}; 213 214struct mon_table mon_dispatch_postauth20[] = { 215 {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, 216 {MONITOR_REQ_SIGN, 0, mm_answer_sign}, 217 {MONITOR_REQ_PTY, 0, mm_answer_pty}, 218 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, 219 {MONITOR_REQ_TERM, 0, mm_answer_term}, 220 {0, 0, NULL} 221}; 222 223struct mon_table mon_dispatch_proto15[] = { 224 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, 225 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, 226 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, 227 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 228 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, 229 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, 230 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, 231 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, 232 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 233 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, 234 {0, 0, NULL} 235}; 236 237struct mon_table mon_dispatch_postauth15[] = { 238 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, 239 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, 240 {MONITOR_REQ_TERM, 0, mm_answer_term}, 241 {0, 0, NULL} 242}; 243 244struct mon_table *mon_dispatch; 245 246/* Specifies if a certain message is allowed at the moment */ 247 248static void 249monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) 250{ 251 while (ent->f != NULL) { 252 if (ent->type == type) { 253 ent->flags &= ~MON_PERMIT; 254 ent->flags |= permit ? MON_PERMIT : 0; 255 return; 256 } 257 ent++; 258 } 259} 260 261static void 262monitor_permit_authentications(int permit) 263{ 264 struct mon_table *ent = mon_dispatch; 265 266 while (ent->f != NULL) { 267 if (ent->flags & MON_AUTH) { 268 ent->flags &= ~MON_PERMIT; 269 ent->flags |= permit ? MON_PERMIT : 0; 270 } 271 ent++; 272 } 273} 274 275void 276monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) 277{ 278 struct mon_table *ent; 279 int authenticated = 0, partial = 0; 280 281 debug3("preauth child monitor started"); 282 283 close(pmonitor->m_recvfd); 284 close(pmonitor->m_log_sendfd); 285 pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1; 286 287 authctxt = _authctxt; 288 memset(authctxt, 0, sizeof(*authctxt)); 289 290 if (compat20) { 291 mon_dispatch = mon_dispatch_proto20; 292 293 /* Permit requests for moduli and signatures */ 294 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 295 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 296 } else { 297 mon_dispatch = mon_dispatch_proto15; 298 299 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); 300 } 301 302 /* The first few requests do not require asynchronous access */ 303 while (!authenticated) { 304 partial = 0; 305 auth_method = "unknown"; 306 auth_submethod = NULL; 307 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); 308 309 /* Special handling for multiple required authentications */ 310 if (options.num_auth_methods != 0) { 311 if (!compat20) 312 fatal("AuthenticationMethods is not supported" 313 "with SSH protocol 1"); 314 if (authenticated && 315 !auth2_update_methods_lists(authctxt, 316 auth_method, auth_submethod)) { 317 debug3("%s: method %s: partial", __func__, 318 auth_method); 319 authenticated = 0; 320 partial = 1; 321 } 322 } 323 324 if (authenticated) { 325 if (!(ent->flags & MON_AUTHDECIDE)) 326 fatal("%s: unexpected authentication from %d", 327 __func__, ent->type); 328 if (authctxt->pw->pw_uid == 0 && 329 !auth_root_allowed(auth_method)) 330 authenticated = 0; 331 } 332 if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { 333 auth_log(authctxt, authenticated, partial, 334 auth_method, auth_submethod); 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 368static void 369monitor_set_child_handler(pid_t pid) 370{ 371 monitor_child_pid = pid; 372} 373 374static void 375monitor_child_handler(int sig) 376{ 377 kill(monitor_child_pid, sig); 378} 379 380void 381monitor_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 411void 412monitor_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 420static int 421monitor_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 free(msg); 463 464 return 0; 465} 466 467int 468monitor_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 */ 539static int 540monitor_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 549static void 550monitor_reset_key_state(void) 551{ 552 /* reset state */ 553 free(key_blob); 554 free(hostbased_cuser); 555 free(hostbased_chost); 556 key_blob = NULL; 557 key_bloblen = 0; 558 key_blobtype = MM_NOKEY; 559 hostbased_cuser = NULL; 560 hostbased_chost = NULL; 561} 562 563int 564mm_answer_moduli(int sock, Buffer *m) 565{ 566 DH *dh; 567 int min, want, max; 568 569 min = buffer_get_int(m); 570 want = buffer_get_int(m); 571 max = buffer_get_int(m); 572 573 debug3("%s: got parameters: %d %d %d", 574 __func__, min, want, max); 575 /* We need to check here, too, in case the child got corrupted */ 576 if (max < min || want < min || max < want) 577 fatal("%s: bad parameters: %d %d %d", 578 __func__, min, want, max); 579 580 buffer_clear(m); 581 582 dh = choose_dh(min, want, max); 583 if (dh == NULL) { 584 buffer_put_char(m, 0); 585 return (0); 586 } else { 587 /* Send first bignum */ 588 buffer_put_char(m, 1); 589 buffer_put_bignum2(m, dh->p); 590 buffer_put_bignum2(m, dh->g); 591 592 DH_free(dh); 593 } 594 mm_request_send(sock, MONITOR_ANS_MODULI, m); 595 return (0); 596} 597 598extern AuthenticationConnection *auth_conn; 599 600int 601mm_answer_sign(int sock, Buffer *m) 602{ 603 Key *key; 604 u_char *p; 605 u_char *signature; 606 u_int siglen, datlen; 607 int keyid; 608 609 debug3("%s", __func__); 610 611 keyid = buffer_get_int(m); 612 p = buffer_get_string(m, &datlen); 613 614 /* 615 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes), 616 * SHA384 (48 bytes) and SHA512 (64 bytes). 617 */ 618 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) 619 fatal("%s: data length incorrect: %u", __func__, datlen); 620 621 /* save session id, it will be passed on the first call */ 622 if (session_id2_len == 0) { 623 session_id2_len = datlen; 624 session_id2 = xmalloc(session_id2_len); 625 memcpy(session_id2, p, session_id2_len); 626 } 627 628 if ((key = get_hostkey_by_index(keyid)) != NULL) { 629 if (key_sign(key, &signature, &siglen, p, datlen) < 0) 630 fatal("%s: key_sign failed", __func__); 631 } else if ((key = get_hostkey_public_by_index(keyid)) != NULL && 632 auth_conn != NULL) { 633 if (ssh_agent_sign(auth_conn, key, &signature, &siglen, p, 634 datlen) < 0) 635 fatal("%s: ssh_agent_sign failed", __func__); 636 } else 637 fatal("%s: no hostkey from index %d", __func__, keyid); 638 639 debug3("%s: signature %p(%u)", __func__, signature, siglen); 640 641 buffer_clear(m); 642 buffer_put_string(m, signature, siglen); 643 644 free(p); 645 free(signature); 646 647 mm_request_send(sock, MONITOR_ANS_SIGN, m); 648 649 /* Turn on permissions for getpwnam */ 650 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 651 652 return (0); 653} 654 655/* Retrieves the password entry and also checks if the user is permitted */ 656 657int 658mm_answer_pwnamallow(int sock, Buffer *m) 659{ 660 char *username; 661 struct passwd *pwent; 662 int allowed = 0; 663 u_int i; 664 665 debug3("%s", __func__); 666 667 if (authctxt->attempt++ != 0) 668 fatal("%s: multiple attempts for getpwnam", __func__); 669 670 username = buffer_get_string(m, NULL); 671 672 pwent = getpwnamallow(username); 673 674 authctxt->user = xstrdup(username); 675 setproctitle("%s [priv]", pwent ? username : "unknown"); 676 free(username); 677 678 buffer_clear(m); 679 680 if (pwent == NULL) { 681 buffer_put_char(m, 0); 682 authctxt->pw = fakepw(); 683 goto out; 684 } 685 686 allowed = 1; 687 authctxt->pw = pwent; 688 authctxt->valid = 1; 689 690 buffer_put_char(m, 1); 691 buffer_put_string(m, pwent, sizeof(struct passwd)); 692 buffer_put_cstring(m, pwent->pw_name); 693 buffer_put_cstring(m, "*"); 694 buffer_put_cstring(m, pwent->pw_gecos); 695 buffer_put_cstring(m, pwent->pw_class); 696 buffer_put_cstring(m, pwent->pw_dir); 697 buffer_put_cstring(m, pwent->pw_shell); 698 699 out: 700 buffer_put_string(m, &options, sizeof(options)); 701 702#define M_CP_STROPT(x) do { \ 703 if (options.x != NULL) \ 704 buffer_put_cstring(m, options.x); \ 705 } while (0) 706#define M_CP_STRARRAYOPT(x, nx) do { \ 707 for (i = 0; i < options.nx; i++) \ 708 buffer_put_cstring(m, options.x[i]); \ 709 } while (0) 710 /* See comment in servconf.h */ 711 COPY_MATCH_STRING_OPTS(); 712#undef M_CP_STROPT 713#undef M_CP_STRARRAYOPT 714 715 /* Create valid auth method lists */ 716 if (compat20 && auth2_setup_methods_lists(authctxt) != 0) { 717 /* 718 * The monitor will continue long enough to let the child 719 * run to it's packet_disconnect(), but it must not allow any 720 * authentication to succeed. 721 */ 722 debug("%s: no valid authentication method lists", __func__); 723 } 724 725 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); 726 mm_request_send(sock, MONITOR_ANS_PWNAM, m); 727 728 /* For SSHv1 allow authentication now */ 729 if (!compat20) 730 monitor_permit_authentications(1); 731 else { 732 /* Allow service/style information on the auth context */ 733 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); 734 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); 735 } 736 737 return (0); 738} 739 740int mm_answer_auth2_read_banner(int sock, Buffer *m) 741{ 742 char *banner; 743 744 buffer_clear(m); 745 banner = auth2_read_banner(); 746 buffer_put_cstring(m, banner != NULL ? banner : ""); 747 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); 748 free(banner); 749 750 return (0); 751} 752 753int 754mm_answer_authserv(int sock, Buffer *m) 755{ 756 monitor_permit_authentications(1); 757 758 authctxt->service = buffer_get_string(m, NULL); 759 authctxt->style = buffer_get_string(m, NULL); 760 debug3("%s: service=%s, style=%s", 761 __func__, authctxt->service, authctxt->style); 762 763 if (strlen(authctxt->style) == 0) { 764 free(authctxt->style); 765 authctxt->style = NULL; 766 } 767 768 return (0); 769} 770 771int 772mm_answer_authpassword(int sock, Buffer *m) 773{ 774 static int call_count; 775 char *passwd; 776 int authenticated; 777 u_int plen; 778 779 passwd = buffer_get_string(m, &plen); 780 /* Only authenticate if the context is valid */ 781 authenticated = options.password_authentication && 782 auth_password(authctxt, passwd); 783 memset(passwd, 0, strlen(passwd)); 784 free(passwd); 785 786 buffer_clear(m); 787 buffer_put_int(m, authenticated); 788 789 debug3("%s: sending result %d", __func__, authenticated); 790 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); 791 792 call_count++; 793 if (plen == 0 && call_count == 1) 794 auth_method = "none"; 795 else 796 auth_method = "password"; 797 798 /* Causes monitor loop to terminate if authenticated */ 799 return (authenticated); 800} 801 802int 803mm_answer_bsdauthquery(int sock, Buffer *m) 804{ 805 char *name, *infotxt; 806 u_int numprompts; 807 u_int *echo_on; 808 char **prompts; 809 u_int success; 810 811 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, 812 &prompts, &echo_on) < 0 ? 0 : 1; 813 814 buffer_clear(m); 815 buffer_put_int(m, success); 816 if (success) 817 buffer_put_cstring(m, prompts[0]); 818 819 debug3("%s: sending challenge success: %u", __func__, success); 820 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); 821 822 if (success) { 823 free(name); 824 free(infotxt); 825 free(prompts); 826 free(echo_on); 827 } 828 829 return (0); 830} 831 832int 833mm_answer_bsdauthrespond(int sock, Buffer *m) 834{ 835 char *response; 836 int authok; 837 838 if (authctxt->as == 0) 839 fatal("%s: no bsd auth session", __func__); 840 841 response = buffer_get_string(m, NULL); 842 authok = options.challenge_response_authentication && 843 auth_userresponse(authctxt->as, response, 0); 844 authctxt->as = NULL; 845 debug3("%s: <%s> = <%d>", __func__, response, authok); 846 free(response); 847 848 buffer_clear(m); 849 buffer_put_int(m, authok); 850 851 debug3("%s: sending authenticated: %d", __func__, authok); 852 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); 853 854 if (compat20) { 855 auth_method = "keyboard-interactive"; 856 auth_submethod = "bsdauth"; 857 } else 858 auth_method = "bsdauth"; 859 860 return (authok != 0); 861} 862 863int 864mm_answer_keyallowed(int sock, Buffer *m) 865{ 866 Key *key; 867 char *cuser, *chost; 868 u_char *blob; 869 u_int bloblen; 870 enum mm_keytype type = 0; 871 int allowed = 0; 872 873 debug3("%s entering", __func__); 874 875 type = buffer_get_int(m); 876 cuser = buffer_get_string(m, NULL); 877 chost = buffer_get_string(m, NULL); 878 blob = buffer_get_string(m, &bloblen); 879 880 key = key_from_blob(blob, bloblen); 881 882 if ((compat20 && type == MM_RSAHOSTKEY) || 883 (!compat20 && type != MM_RSAHOSTKEY)) 884 fatal("%s: key type and protocol mismatch", __func__); 885 886 debug3("%s: key_from_blob: %p", __func__, key); 887 888 if (key != NULL && authctxt->valid) { 889 switch (type) { 890 case MM_USERKEY: 891 allowed = options.pubkey_authentication && 892 user_key_allowed(authctxt->pw, key); 893 pubkey_auth_info(authctxt, key, NULL); 894 auth_method = "publickey"; 895 if (options.pubkey_authentication && allowed != 1) 896 auth_clear_options(); 897 break; 898 case MM_HOSTKEY: 899 allowed = options.hostbased_authentication && 900 hostbased_key_allowed(authctxt->pw, 901 cuser, chost, key); 902 pubkey_auth_info(authctxt, key, 903 "client user \"%.100s\", client host \"%.100s\"", 904 cuser, chost); 905 auth_method = "hostbased"; 906 break; 907 case MM_RSAHOSTKEY: 908 key->type = KEY_RSA1; /* XXX */ 909 allowed = options.rhosts_rsa_authentication && 910 auth_rhosts_rsa_key_allowed(authctxt->pw, 911 cuser, chost, key); 912 if (options.rhosts_rsa_authentication && allowed != 1) 913 auth_clear_options(); 914 auth_method = "rsa"; 915 break; 916 default: 917 fatal("%s: unknown key type %d", __func__, type); 918 break; 919 } 920 } 921 if (key != NULL) 922 key_free(key); 923 924 /* clear temporarily storage (used by verify) */ 925 monitor_reset_key_state(); 926 927 if (allowed) { 928 /* Save temporarily for comparison in verify */ 929 key_blob = blob; 930 key_bloblen = bloblen; 931 key_blobtype = type; 932 hostbased_cuser = cuser; 933 hostbased_chost = chost; 934 } else { 935 /* Log failed attempt */ 936 auth_log(authctxt, 0, 0, auth_method, NULL); 937 free(blob); 938 free(cuser); 939 free(chost); 940 } 941 942 debug3("%s: key %p is %s", 943 __func__, key, allowed ? "allowed" : "not allowed"); 944 945 buffer_clear(m); 946 buffer_put_int(m, allowed); 947 buffer_put_int(m, forced_command != NULL); 948 949 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); 950 951 if (type == MM_RSAHOSTKEY) 952 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 953 954 return (0); 955} 956 957static int 958monitor_valid_userblob(u_char *data, u_int datalen) 959{ 960 Buffer b; 961 char *p, *userstyle; 962 u_int len; 963 int fail = 0; 964 965 buffer_init(&b); 966 buffer_append(&b, data, datalen); 967 968 if (datafellows & SSH_OLD_SESSIONID) { 969 p = buffer_ptr(&b); 970 len = buffer_len(&b); 971 if ((session_id2 == NULL) || 972 (len < session_id2_len) || 973 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 974 fail++; 975 buffer_consume(&b, session_id2_len); 976 } else { 977 p = buffer_get_string(&b, &len); 978 if ((session_id2 == NULL) || 979 (len != session_id2_len) || 980 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 981 fail++; 982 free(p); 983 } 984 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 985 fail++; 986 p = buffer_get_cstring(&b, NULL); 987 xasprintf(&userstyle, "%s%s%s", authctxt->user, 988 authctxt->style ? ":" : "", 989 authctxt->style ? authctxt->style : ""); 990 if (strcmp(userstyle, p) != 0) { 991 logit("wrong user name passed to monitor: expected %s != %.100s", 992 userstyle, p); 993 fail++; 994 } 995 free(userstyle); 996 free(p); 997 buffer_skip_string(&b); 998 if (datafellows & SSH_BUG_PKAUTH) { 999 if (!buffer_get_char(&b)) 1000 fail++; 1001 } else { 1002 p = buffer_get_cstring(&b, NULL); 1003 if (strcmp("publickey", p) != 0) 1004 fail++; 1005 free(p); 1006 if (!buffer_get_char(&b)) 1007 fail++; 1008 buffer_skip_string(&b); 1009 } 1010 buffer_skip_string(&b); 1011 if (buffer_len(&b) != 0) 1012 fail++; 1013 buffer_free(&b); 1014 return (fail == 0); 1015} 1016 1017static int 1018monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, 1019 char *chost) 1020{ 1021 Buffer b; 1022 char *p, *userstyle; 1023 u_int len; 1024 int fail = 0; 1025 1026 buffer_init(&b); 1027 buffer_append(&b, data, datalen); 1028 1029 p = buffer_get_string(&b, &len); 1030 if ((session_id2 == NULL) || 1031 (len != session_id2_len) || 1032 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 1033 fail++; 1034 free(p); 1035 1036 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 1037 fail++; 1038 p = buffer_get_cstring(&b, NULL); 1039 xasprintf(&userstyle, "%s%s%s", authctxt->user, 1040 authctxt->style ? ":" : "", 1041 authctxt->style ? authctxt->style : ""); 1042 if (strcmp(userstyle, p) != 0) { 1043 logit("wrong user name passed to monitor: expected %s != %.100s", 1044 userstyle, p); 1045 fail++; 1046 } 1047 free(userstyle); 1048 free(p); 1049 buffer_skip_string(&b); /* service */ 1050 p = buffer_get_cstring(&b, NULL); 1051 if (strcmp(p, "hostbased") != 0) 1052 fail++; 1053 free(p); 1054 buffer_skip_string(&b); /* pkalg */ 1055 buffer_skip_string(&b); /* pkblob */ 1056 1057 /* verify client host, strip trailing dot if necessary */ 1058 p = buffer_get_string(&b, NULL); 1059 if (((len = strlen(p)) > 0) && p[len - 1] == '.') 1060 p[len - 1] = '\0'; 1061 if (strcmp(p, chost) != 0) 1062 fail++; 1063 free(p); 1064 1065 /* verify client user */ 1066 p = buffer_get_string(&b, NULL); 1067 if (strcmp(p, cuser) != 0) 1068 fail++; 1069 free(p); 1070 1071 if (buffer_len(&b) != 0) 1072 fail++; 1073 buffer_free(&b); 1074 return (fail == 0); 1075} 1076 1077int 1078mm_answer_keyverify(int sock, Buffer *m) 1079{ 1080 Key *key; 1081 u_char *signature, *data, *blob; 1082 u_int signaturelen, datalen, bloblen; 1083 int verified = 0; 1084 int valid_data = 0; 1085 1086 blob = buffer_get_string(m, &bloblen); 1087 signature = buffer_get_string(m, &signaturelen); 1088 data = buffer_get_string(m, &datalen); 1089 1090 if (hostbased_cuser == NULL || hostbased_chost == NULL || 1091 !monitor_allowed_key(blob, bloblen)) 1092 fatal("%s: bad key, not previously allowed", __func__); 1093 1094 key = key_from_blob(blob, bloblen); 1095 if (key == NULL) 1096 fatal("%s: bad public key blob", __func__); 1097 1098 switch (key_blobtype) { 1099 case MM_USERKEY: 1100 valid_data = monitor_valid_userblob(data, datalen); 1101 break; 1102 case MM_HOSTKEY: 1103 valid_data = monitor_valid_hostbasedblob(data, datalen, 1104 hostbased_cuser, hostbased_chost); 1105 break; 1106 default: 1107 valid_data = 0; 1108 break; 1109 } 1110 if (!valid_data) 1111 fatal("%s: bad signature data blob", __func__); 1112 1113 verified = key_verify(key, signature, signaturelen, data, datalen); 1114 debug3("%s: key %p signature %s", 1115 __func__, key, (verified == 1) ? "verified" : "unverified"); 1116 1117 key_free(key); 1118 free(blob); 1119 free(signature); 1120 free(data); 1121 1122 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; 1123 1124 monitor_reset_key_state(); 1125 1126 buffer_clear(m); 1127 buffer_put_int(m, verified); 1128 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); 1129 1130 return (verified == 1); 1131} 1132 1133static void 1134mm_record_login(Session *s, struct passwd *pw) 1135{ 1136 socklen_t fromlen; 1137 struct sockaddr_storage from; 1138 1139 /* 1140 * Get IP address of client. If the connection is not a socket, let 1141 * the address be 0.0.0.0. 1142 */ 1143 memset(&from, 0, sizeof(from)); 1144 fromlen = sizeof(from); 1145 if (packet_connection_is_on_socket()) { 1146 if (getpeername(packet_get_connection_in(), 1147 (struct sockaddr *)&from, &fromlen) < 0) { 1148 debug("getpeername: %.100s", strerror(errno)); 1149 cleanup_exit(255); 1150 } 1151 } 1152 /* Record that there was a login on that tty from the remote host. */ 1153 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, 1154 get_remote_name_or_ip(utmp_len, options.use_dns), 1155 (struct sockaddr *)&from, fromlen); 1156} 1157 1158static void 1159mm_session_close(Session *s) 1160{ 1161 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); 1162 if (s->ttyfd != -1) { 1163 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); 1164 session_pty_cleanup2(s); 1165 } 1166 session_unused(s->self); 1167} 1168 1169int 1170mm_answer_pty(int sock, Buffer *m) 1171{ 1172 extern struct monitor *pmonitor; 1173 Session *s; 1174 int res, fd0; 1175 1176 debug3("%s entering", __func__); 1177 1178 buffer_clear(m); 1179 s = session_new(); 1180 if (s == NULL) 1181 goto error; 1182 s->authctxt = authctxt; 1183 s->pw = authctxt->pw; 1184 s->pid = pmonitor->m_pid; 1185 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); 1186 if (res == 0) 1187 goto error; 1188 pty_setowner(authctxt->pw, s->tty); 1189 1190 buffer_put_int(m, 1); 1191 buffer_put_cstring(m, s->tty); 1192 1193 /* We need to trick ttyslot */ 1194 if (dup2(s->ttyfd, 0) == -1) 1195 fatal("%s: dup2", __func__); 1196 1197 mm_record_login(s, authctxt->pw); 1198 1199 /* Now we can close the file descriptor again */ 1200 close(0); 1201 1202 /* send messages generated by record_login */ 1203 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); 1204 buffer_clear(&loginmsg); 1205 1206 mm_request_send(sock, MONITOR_ANS_PTY, m); 1207 1208 if (mm_send_fd(sock, s->ptyfd) == -1 || 1209 mm_send_fd(sock, s->ttyfd) == -1) 1210 fatal("%s: send fds failed", __func__); 1211 1212 /* make sure nothing uses fd 0 */ 1213 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) 1214 fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); 1215 if (fd0 != 0) 1216 error("%s: fd0 %d != 0", __func__, fd0); 1217 1218 /* slave is not needed */ 1219 close(s->ttyfd); 1220 s->ttyfd = s->ptyfd; 1221 /* no need to dup() because nobody closes ptyfd */ 1222 s->ptymaster = s->ptyfd; 1223 1224 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); 1225 1226 return (0); 1227 1228 error: 1229 if (s != NULL) 1230 mm_session_close(s); 1231 buffer_put_int(m, 0); 1232 mm_request_send(sock, MONITOR_ANS_PTY, m); 1233 return (0); 1234} 1235 1236int 1237mm_answer_pty_cleanup(int sock, Buffer *m) 1238{ 1239 Session *s; 1240 char *tty; 1241 1242 debug3("%s entering", __func__); 1243 1244 tty = buffer_get_string(m, NULL); 1245 if ((s = session_by_tty(tty)) != NULL) 1246 mm_session_close(s); 1247 buffer_clear(m); 1248 free(tty); 1249 return (0); 1250} 1251 1252int 1253mm_answer_sesskey(int sock, Buffer *m) 1254{ 1255 BIGNUM *p; 1256 int rsafail; 1257 1258 /* Turn off permissions */ 1259 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); 1260 1261 if ((p = BN_new()) == NULL) 1262 fatal("%s: BN_new", __func__); 1263 1264 buffer_get_bignum2(m, p); 1265 1266 rsafail = ssh1_session_key(p); 1267 1268 buffer_clear(m); 1269 buffer_put_int(m, rsafail); 1270 buffer_put_bignum2(m, p); 1271 1272 BN_clear_free(p); 1273 1274 mm_request_send(sock, MONITOR_ANS_SESSKEY, m); 1275 1276 /* Turn on permissions for sessid passing */ 1277 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); 1278 1279 return (0); 1280} 1281 1282int 1283mm_answer_sessid(int sock, Buffer *m) 1284{ 1285 int i; 1286 1287 debug3("%s entering", __func__); 1288 1289 if (buffer_len(m) != 16) 1290 fatal("%s: bad ssh1 session id", __func__); 1291 for (i = 0; i < 16; i++) 1292 session_id[i] = buffer_get_char(m); 1293 1294 /* Turn on permissions for getpwnam */ 1295 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 1296 1297 return (0); 1298} 1299 1300int 1301mm_answer_rsa_keyallowed(int sock, Buffer *m) 1302{ 1303 BIGNUM *client_n; 1304 Key *key = NULL; 1305 u_char *blob = NULL; 1306 u_int blen = 0; 1307 int allowed = 0; 1308 1309 debug3("%s entering", __func__); 1310 1311 auth_method = "rsa"; 1312 if (options.rsa_authentication && authctxt->valid) { 1313 if ((client_n = BN_new()) == NULL) 1314 fatal("%s: BN_new", __func__); 1315 buffer_get_bignum2(m, client_n); 1316 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); 1317 BN_clear_free(client_n); 1318 } 1319 buffer_clear(m); 1320 buffer_put_int(m, allowed); 1321 buffer_put_int(m, forced_command != NULL); 1322 1323 /* clear temporarily storage (used by generate challenge) */ 1324 monitor_reset_key_state(); 1325 1326 if (allowed && key != NULL) { 1327 key->type = KEY_RSA; /* cheat for key_to_blob */ 1328 if (key_to_blob(key, &blob, &blen) == 0) 1329 fatal("%s: key_to_blob failed", __func__); 1330 buffer_put_string(m, blob, blen); 1331 1332 /* Save temporarily for comparison in verify */ 1333 key_blob = blob; 1334 key_bloblen = blen; 1335 key_blobtype = MM_RSAUSERKEY; 1336 } 1337 if (key != NULL) 1338 key_free(key); 1339 1340 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); 1341 1342 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 1343 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); 1344 return (0); 1345} 1346 1347int 1348mm_answer_rsa_challenge(int sock, Buffer *m) 1349{ 1350 Key *key = NULL; 1351 u_char *blob; 1352 u_int blen; 1353 1354 debug3("%s entering", __func__); 1355 1356 if (!authctxt->valid) 1357 fatal("%s: authctxt not valid", __func__); 1358 blob = buffer_get_string(m, &blen); 1359 if (!monitor_allowed_key(blob, blen)) 1360 fatal("%s: bad key, not previously allowed", __func__); 1361 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1362 fatal("%s: key type mismatch", __func__); 1363 if ((key = key_from_blob(blob, blen)) == NULL) 1364 fatal("%s: received bad key", __func__); 1365 if (key->type != KEY_RSA) 1366 fatal("%s: received bad key type %d", __func__, key->type); 1367 key->type = KEY_RSA1; 1368 if (ssh1_challenge) 1369 BN_clear_free(ssh1_challenge); 1370 ssh1_challenge = auth_rsa_generate_challenge(key); 1371 1372 buffer_clear(m); 1373 buffer_put_bignum2(m, ssh1_challenge); 1374 1375 debug3("%s sending reply", __func__); 1376 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); 1377 1378 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); 1379 1380 free(blob); 1381 key_free(key); 1382 return (0); 1383} 1384 1385int 1386mm_answer_rsa_response(int sock, Buffer *m) 1387{ 1388 Key *key = NULL; 1389 u_char *blob, *response; 1390 u_int blen, len; 1391 int success; 1392 1393 debug3("%s entering", __func__); 1394 1395 if (!authctxt->valid) 1396 fatal("%s: authctxt not valid", __func__); 1397 if (ssh1_challenge == NULL) 1398 fatal("%s: no ssh1_challenge", __func__); 1399 1400 blob = buffer_get_string(m, &blen); 1401 if (!monitor_allowed_key(blob, blen)) 1402 fatal("%s: bad key, not previously allowed", __func__); 1403 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1404 fatal("%s: key type mismatch: %d", __func__, key_blobtype); 1405 if ((key = key_from_blob(blob, blen)) == NULL) 1406 fatal("%s: received bad key", __func__); 1407 response = buffer_get_string(m, &len); 1408 if (len != 16) 1409 fatal("%s: received bad response to challenge", __func__); 1410 success = auth_rsa_verify_response(key, ssh1_challenge, response); 1411 1412 free(blob); 1413 key_free(key); 1414 free(response); 1415 1416 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; 1417 1418 /* reset state */ 1419 BN_clear_free(ssh1_challenge); 1420 ssh1_challenge = NULL; 1421 monitor_reset_key_state(); 1422 1423 buffer_clear(m); 1424 buffer_put_int(m, success); 1425 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); 1426 1427 return (success); 1428} 1429 1430int 1431mm_answer_term(int sock, Buffer *req) 1432{ 1433 extern struct monitor *pmonitor; 1434 int res, status; 1435 1436 debug3("%s: tearing down sessions", __func__); 1437 1438 /* The child is terminating */ 1439 session_destroy_all(&mm_session_close); 1440 1441 while (waitpid(pmonitor->m_pid, &status, 0) == -1) 1442 if (errno != EINTR) 1443 exit(1); 1444 1445 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; 1446 1447 /* Terminate process */ 1448 exit(res); 1449} 1450 1451void 1452monitor_apply_keystate(struct monitor *pmonitor) 1453{ 1454 if (compat20) { 1455 set_newkeys(MODE_IN); 1456 set_newkeys(MODE_OUT); 1457 } else { 1458 packet_set_protocol_flags(child_state.ssh1protoflags); 1459 packet_set_encryption_key(child_state.ssh1key, 1460 child_state.ssh1keylen, child_state.ssh1cipher); 1461 free(child_state.ssh1key); 1462 } 1463 1464 /* for rc4 and other stateful ciphers */ 1465 packet_set_keycontext(MODE_OUT, child_state.keyout); 1466 free(child_state.keyout); 1467 packet_set_keycontext(MODE_IN, child_state.keyin); 1468 free(child_state.keyin); 1469 1470 if (!compat20) { 1471 packet_set_iv(MODE_OUT, child_state.ivout); 1472 free(child_state.ivout); 1473 packet_set_iv(MODE_IN, child_state.ivin); 1474 free(child_state.ivin); 1475 } 1476 1477 memcpy(&incoming_stream, &child_state.incoming, 1478 sizeof(incoming_stream)); 1479 memcpy(&outgoing_stream, &child_state.outgoing, 1480 sizeof(outgoing_stream)); 1481 1482 /* Update with new address */ 1483 if (options.compression) 1484 mm_init_compression(pmonitor->m_zlib); 1485 1486 if (options.rekey_limit || options.rekey_interval) 1487 packet_set_rekey_limits((u_int32_t)options.rekey_limit, 1488 (time_t)options.rekey_interval); 1489 1490 /* Network I/O buffers */ 1491 /* XXX inefficient for large buffers, need: buffer_init_from_string */ 1492 buffer_clear(packet_get_input()); 1493 buffer_append(packet_get_input(), child_state.input, child_state.ilen); 1494 memset(child_state.input, 0, child_state.ilen); 1495 free(child_state.input); 1496 1497 buffer_clear(packet_get_output()); 1498 buffer_append(packet_get_output(), child_state.output, 1499 child_state.olen); 1500 memset(child_state.output, 0, child_state.olen); 1501 free(child_state.output); 1502 1503 /* Roaming */ 1504 if (compat20) 1505 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes); 1506} 1507 1508static Kex * 1509mm_get_kex(Buffer *m) 1510{ 1511 Kex *kex; 1512 void *blob; 1513 u_int bloblen; 1514 1515 kex = xcalloc(1, sizeof(*kex)); 1516 kex->session_id = buffer_get_string(m, &kex->session_id_len); 1517 if (session_id2 == NULL || 1518 kex->session_id_len != session_id2_len || 1519 timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0) 1520 fatal("mm_get_get: internal error: bad session id"); 1521 kex->we_need = buffer_get_int(m); 1522 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; 1523 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; 1524 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; 1525 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; 1526 kex->kex[KEX_ECDH_SHA2] = kexecdh_server; 1527 kex->server = 1; 1528 kex->hostkey_type = buffer_get_int(m); 1529 kex->kex_type = buffer_get_int(m); 1530 blob = buffer_get_string(m, &bloblen); 1531 buffer_init(&kex->my); 1532 buffer_append(&kex->my, blob, bloblen); 1533 free(blob); 1534 blob = buffer_get_string(m, &bloblen); 1535 buffer_init(&kex->peer); 1536 buffer_append(&kex->peer, blob, bloblen); 1537 free(blob); 1538 kex->done = 1; 1539 kex->flags = buffer_get_int(m); 1540 kex->client_version_string = buffer_get_string(m, NULL); 1541 kex->server_version_string = buffer_get_string(m, NULL); 1542 kex->load_host_public_key=&get_hostkey_public_by_type; 1543 kex->load_host_private_key=&get_hostkey_private_by_type; 1544 kex->host_key_index=&get_hostkey_index; 1545 kex->sign = sshd_hostkey_sign; 1546 1547 return (kex); 1548} 1549 1550/* This function requries careful sanity checking */ 1551 1552void 1553mm_get_keystate(struct monitor *pmonitor) 1554{ 1555 Buffer m; 1556 u_char *blob, *p; 1557 u_int bloblen, plen; 1558 u_int32_t seqnr, packets; 1559 u_int64_t blocks, bytes; 1560 1561 debug3("%s: Waiting for new keys", __func__); 1562 1563 buffer_init(&m); 1564 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); 1565 if (!compat20) { 1566 child_state.ssh1protoflags = buffer_get_int(&m); 1567 child_state.ssh1cipher = buffer_get_int(&m); 1568 child_state.ssh1key = buffer_get_string(&m, 1569 &child_state.ssh1keylen); 1570 child_state.ivout = buffer_get_string(&m, 1571 &child_state.ivoutlen); 1572 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); 1573 goto skip; 1574 } else { 1575 /* Get the Kex for rekeying */ 1576 *pmonitor->m_pkex = mm_get_kex(&m); 1577 } 1578 1579 blob = buffer_get_string(&m, &bloblen); 1580 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); 1581 free(blob); 1582 1583 debug3("%s: Waiting for second key", __func__); 1584 blob = buffer_get_string(&m, &bloblen); 1585 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); 1586 free(blob); 1587 1588 /* Now get sequence numbers for the packets */ 1589 seqnr = buffer_get_int(&m); 1590 blocks = buffer_get_int64(&m); 1591 packets = buffer_get_int(&m); 1592 bytes = buffer_get_int64(&m); 1593 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes); 1594 seqnr = buffer_get_int(&m); 1595 blocks = buffer_get_int64(&m); 1596 packets = buffer_get_int(&m); 1597 bytes = buffer_get_int64(&m); 1598 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes); 1599 1600 skip: 1601 /* Get the key context */ 1602 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); 1603 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); 1604 1605 debug3("%s: Getting compression state", __func__); 1606 /* Get compression state */ 1607 p = buffer_get_string(&m, &plen); 1608 if (plen != sizeof(child_state.outgoing)) 1609 fatal("%s: bad request size", __func__); 1610 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); 1611 free(p); 1612 1613 p = buffer_get_string(&m, &plen); 1614 if (plen != sizeof(child_state.incoming)) 1615 fatal("%s: bad request size", __func__); 1616 memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); 1617 free(p); 1618 1619 /* Network I/O buffers */ 1620 debug3("%s: Getting Network I/O buffers", __func__); 1621 child_state.input = buffer_get_string(&m, &child_state.ilen); 1622 child_state.output = buffer_get_string(&m, &child_state.olen); 1623 1624 /* Roaming */ 1625 if (compat20) { 1626 child_state.sent_bytes = buffer_get_int64(&m); 1627 child_state.recv_bytes = buffer_get_int64(&m); 1628 } 1629 1630 buffer_free(&m); 1631} 1632 1633 1634/* Allocation functions for zlib */ 1635void * 1636mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) 1637{ 1638 size_t len = (size_t) size * ncount; 1639 void *address; 1640 1641 if (len == 0 || ncount > SIZE_T_MAX / size) 1642 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); 1643 1644 address = mm_malloc(mm, len); 1645 1646 return (address); 1647} 1648 1649void 1650mm_zfree(struct mm_master *mm, void *address) 1651{ 1652 mm_free(mm, address); 1653} 1654 1655void 1656mm_init_compression(struct mm_master *mm) 1657{ 1658 outgoing_stream.zalloc = (alloc_func)mm_zalloc; 1659 outgoing_stream.zfree = (free_func)mm_zfree; 1660 outgoing_stream.opaque = mm; 1661 1662 incoming_stream.zalloc = (alloc_func)mm_zalloc; 1663 incoming_stream.zfree = (free_func)mm_zfree; 1664 incoming_stream.opaque = mm; 1665} 1666 1667/* XXX */ 1668 1669#define FD_CLOSEONEXEC(x) do { \ 1670 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \ 1671 fatal("fcntl(%d, F_SETFD)", x); \ 1672} while (0) 1673 1674static void 1675monitor_openfds(struct monitor *mon, int do_logfds) 1676{ 1677 int pair[2]; 1678 1679 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) 1680 fatal("%s: socketpair: %s", __func__, strerror(errno)); 1681 FD_CLOSEONEXEC(pair[0]); 1682 FD_CLOSEONEXEC(pair[1]); 1683 mon->m_recvfd = pair[0]; 1684 mon->m_sendfd = pair[1]; 1685 1686 if (do_logfds) { 1687 if (pipe(pair) == -1) 1688 fatal("%s: pipe: %s", __func__, strerror(errno)); 1689 FD_CLOSEONEXEC(pair[0]); 1690 FD_CLOSEONEXEC(pair[1]); 1691 mon->m_log_recvfd = pair[0]; 1692 mon->m_log_sendfd = pair[1]; 1693 } else 1694 mon->m_log_recvfd = mon->m_log_sendfd = -1; 1695} 1696 1697#define MM_MEMSIZE 65536 1698 1699struct monitor * 1700monitor_init(void) 1701{ 1702 struct monitor *mon; 1703 1704 mon = xcalloc(1, sizeof(*mon)); 1705 1706 monitor_openfds(mon, 1); 1707 1708 /* Used to share zlib space across processes */ 1709 if (options.compression) { 1710 mon->m_zback = mm_create(NULL, MM_MEMSIZE); 1711 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); 1712 1713 /* Compression needs to share state across borders */ 1714 mm_init_compression(mon->m_zlib); 1715 } 1716 1717 return mon; 1718} 1719 1720void 1721monitor_reinit(struct monitor *mon) 1722{ 1723 monitor_openfds(mon, 0); 1724} 1725 1726#ifdef GSSAPI 1727int 1728mm_answer_gss_setup_ctx(int sock, Buffer *m) 1729{ 1730 gss_OID_desc goid; 1731 OM_uint32 major; 1732 u_int len; 1733 1734 goid.elements = buffer_get_string(m, &len); 1735 goid.length = len; 1736 1737 major = ssh_gssapi_server_ctx(&gsscontext, &goid); 1738 1739 free(goid.elements); 1740 1741 buffer_clear(m); 1742 buffer_put_int(m, major); 1743 1744 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); 1745 1746 /* Now we have a context, enable the step */ 1747 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); 1748 1749 return (0); 1750} 1751 1752int 1753mm_answer_gss_accept_ctx(int sock, Buffer *m) 1754{ 1755 gss_buffer_desc in; 1756 gss_buffer_desc out = GSS_C_EMPTY_BUFFER; 1757 OM_uint32 major, minor; 1758 OM_uint32 flags = 0; /* GSI needs this */ 1759 u_int len; 1760 1761 in.value = buffer_get_string(m, &len); 1762 in.length = len; 1763 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); 1764 free(in.value); 1765 1766 buffer_clear(m); 1767 buffer_put_int(m, major); 1768 buffer_put_string(m, out.value, out.length); 1769 buffer_put_int(m, flags); 1770 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); 1771 1772 gss_release_buffer(&minor, &out); 1773 1774 if (major == GSS_S_COMPLETE) { 1775 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); 1776 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1777 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); 1778 } 1779 return (0); 1780} 1781 1782int 1783mm_answer_gss_checkmic(int sock, Buffer *m) 1784{ 1785 gss_buffer_desc gssbuf, mic; 1786 OM_uint32 ret; 1787 u_int len; 1788 1789 gssbuf.value = buffer_get_string(m, &len); 1790 gssbuf.length = len; 1791 mic.value = buffer_get_string(m, &len); 1792 mic.length = len; 1793 1794 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); 1795 1796 free(gssbuf.value); 1797 free(mic.value); 1798 1799 buffer_clear(m); 1800 buffer_put_int(m, ret); 1801 1802 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); 1803 1804 if (!GSS_ERROR(ret)) 1805 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1806 1807 return (0); 1808} 1809 1810int 1811mm_answer_gss_userok(int sock, Buffer *m) 1812{ 1813 int authenticated; 1814 1815 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); 1816 1817 buffer_clear(m); 1818 buffer_put_int(m, authenticated); 1819 1820 debug3("%s: sending result %d", __func__, authenticated); 1821 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); 1822 1823 auth_method = "gssapi-with-mic"; 1824 1825 /* Monitor loop will terminate if authenticated */ 1826 return (authenticated); 1827} 1828#endif /* GSSAPI */ 1829 1830#ifdef JPAKE 1831int 1832mm_answer_jpake_step1(int sock, Buffer *m) 1833{ 1834 struct jpake_ctx *pctx; 1835 u_char *x3_proof, *x4_proof; 1836 u_int x3_proof_len, x4_proof_len; 1837 1838 if (!options.zero_knowledge_password_authentication) 1839 fatal("zero_knowledge_password_authentication disabled"); 1840 1841 if (authctxt->jpake_ctx != NULL) 1842 fatal("%s: authctxt->jpake_ctx already set (%p)", 1843 __func__, authctxt->jpake_ctx); 1844 authctxt->jpake_ctx = pctx = jpake_new(); 1845 1846 jpake_step1(pctx->grp, 1847 &pctx->server_id, &pctx->server_id_len, 1848 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4, 1849 &x3_proof, &x3_proof_len, 1850 &x4_proof, &x4_proof_len); 1851 1852 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__)); 1853 1854 buffer_clear(m); 1855 1856 buffer_put_string(m, pctx->server_id, pctx->server_id_len); 1857 buffer_put_bignum2(m, pctx->g_x3); 1858 buffer_put_bignum2(m, pctx->g_x4); 1859 buffer_put_string(m, x3_proof, x3_proof_len); 1860 buffer_put_string(m, x4_proof, x4_proof_len); 1861 1862 debug3("%s: sending step1", __func__); 1863 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m); 1864 1865 bzero(x3_proof, x3_proof_len); 1866 bzero(x4_proof, x4_proof_len); 1867 free(x3_proof); 1868 free(x4_proof); 1869 1870 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1); 1871 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0); 1872 1873 return 0; 1874} 1875 1876int 1877mm_answer_jpake_get_pwdata(int sock, Buffer *m) 1878{ 1879 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1880 char *hash_scheme, *salt; 1881 1882 if (pctx == NULL) 1883 fatal("%s: pctx == NULL", __func__); 1884 1885 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt); 1886 1887 buffer_clear(m); 1888 /* pctx->s is sensitive, not returned to slave */ 1889 buffer_put_cstring(m, hash_scheme); 1890 buffer_put_cstring(m, salt); 1891 1892 debug3("%s: sending pwdata", __func__); 1893 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m); 1894 1895 bzero(hash_scheme, strlen(hash_scheme)); 1896 bzero(salt, strlen(salt)); 1897 free(hash_scheme); 1898 free(salt); 1899 1900 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1); 1901 1902 return 0; 1903} 1904 1905int 1906mm_answer_jpake_step2(int sock, Buffer *m) 1907{ 1908 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1909 u_char *x1_proof, *x2_proof, *x4_s_proof; 1910 u_int x1_proof_len, x2_proof_len, x4_s_proof_len; 1911 1912 if (pctx == NULL) 1913 fatal("%s: pctx == NULL", __func__); 1914 1915 if ((pctx->g_x1 = BN_new()) == NULL || 1916 (pctx->g_x2 = BN_new()) == NULL) 1917 fatal("%s: BN_new", __func__); 1918 buffer_get_bignum2(m, pctx->g_x1); 1919 buffer_get_bignum2(m, pctx->g_x2); 1920 pctx->client_id = buffer_get_string(m, &pctx->client_id_len); 1921 x1_proof = buffer_get_string(m, &x1_proof_len); 1922 x2_proof = buffer_get_string(m, &x2_proof_len); 1923 1924 jpake_step2(pctx->grp, pctx->s, pctx->g_x3, 1925 pctx->g_x1, pctx->g_x2, pctx->x4, 1926 pctx->client_id, pctx->client_id_len, 1927 pctx->server_id, pctx->server_id_len, 1928 x1_proof, x1_proof_len, 1929 x2_proof, x2_proof_len, 1930 &pctx->b, 1931 &x4_s_proof, &x4_s_proof_len); 1932 1933 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__)); 1934 1935 bzero(x1_proof, x1_proof_len); 1936 bzero(x2_proof, x2_proof_len); 1937 free(x1_proof); 1938 free(x2_proof); 1939 1940 buffer_clear(m); 1941 1942 buffer_put_bignum2(m, pctx->b); 1943 buffer_put_string(m, x4_s_proof, x4_s_proof_len); 1944 1945 debug3("%s: sending step2", __func__); 1946 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m); 1947 1948 bzero(x4_s_proof, x4_s_proof_len); 1949 free(x4_s_proof); 1950 1951 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1); 1952 1953 return 0; 1954} 1955 1956int 1957mm_answer_jpake_key_confirm(int sock, Buffer *m) 1958{ 1959 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1960 u_char *x2_s_proof; 1961 u_int x2_s_proof_len; 1962 1963 if (pctx == NULL) 1964 fatal("%s: pctx == NULL", __func__); 1965 1966 if ((pctx->a = BN_new()) == NULL) 1967 fatal("%s: BN_new", __func__); 1968 buffer_get_bignum2(m, pctx->a); 1969 x2_s_proof = buffer_get_string(m, &x2_s_proof_len); 1970 1971 jpake_key_confirm(pctx->grp, pctx->s, pctx->a, 1972 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2, 1973 pctx->server_id, pctx->server_id_len, 1974 pctx->client_id, pctx->client_id_len, 1975 session_id2, session_id2_len, 1976 x2_s_proof, x2_s_proof_len, 1977 &pctx->k, 1978 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len); 1979 1980 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__)); 1981 1982 bzero(x2_s_proof, x2_s_proof_len); 1983 buffer_clear(m); 1984 1985 /* pctx->k is sensitive, not sent */ 1986 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len); 1987 1988 debug3("%s: sending confirmation hash", __func__); 1989 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m); 1990 1991 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1); 1992 1993 return 0; 1994} 1995 1996int 1997mm_answer_jpake_check_confirm(int sock, Buffer *m) 1998{ 1999 int authenticated = 0; 2000 u_char *peer_confirm_hash; 2001 u_int peer_confirm_hash_len; 2002 struct jpake_ctx *pctx = authctxt->jpake_ctx; 2003 2004 if (pctx == NULL) 2005 fatal("%s: pctx == NULL", __func__); 2006 2007 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len); 2008 2009 authenticated = jpake_check_confirm(pctx->k, 2010 pctx->client_id, pctx->client_id_len, 2011 session_id2, session_id2_len, 2012 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid; 2013 2014 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__)); 2015 2016 bzero(peer_confirm_hash, peer_confirm_hash_len); 2017 free(peer_confirm_hash); 2018 2019 buffer_clear(m); 2020 buffer_put_int(m, authenticated); 2021 2022 debug3("%s: sending result %d", __func__, authenticated); 2023 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m); 2024 2025 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1); 2026 2027 auth_method = "jpake-01@openssh.com"; 2028 return authenticated; 2029} 2030 2031#endif /* JPAKE */ 2032