1 /* $OpenBSD: monitor.c,v 1.122 2013/03/07 19:27:25 markus Exp $ */ 2 /* 3 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 4 * Copyright 2002 Markus Friedl <markus@openbsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/types.h> 29 #include <sys/wait.h> 30 #include <sys/socket.h> 31 #include <sys/tree.h> 32 #include <sys/param.h> 33 #include <sys/queue.h> 34 35 #include <openssl/dh.h> 36 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <paths.h> 40 #include <poll.h> 41 #include <pwd.h> 42 #include <signal.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "atomicio.h" 47 #include "xmalloc.h" 48 #include "ssh.h" 49 #include "key.h" 50 #include "buffer.h" 51 #include "hostfile.h" 52 #include "auth.h" 53 #include "cipher.h" 54 #include "kex.h" 55 #include "dh.h" 56 #include <zlib.h> 57 #include "packet.h" 58 #include "auth-options.h" 59 #include "sshpty.h" 60 #include "channels.h" 61 #include "session.h" 62 #include "sshlogin.h" 63 #include "canohost.h" 64 #include "log.h" 65 #include "servconf.h" 66 #include "monitor.h" 67 #include "monitor_mm.h" 68 #ifdef GSSAPI 69 #include "ssh-gss.h" 70 #endif 71 #include "monitor_wrap.h" 72 #include "monitor_fdpass.h" 73 #include "misc.h" 74 #include "compat.h" 75 #include "ssh2.h" 76 #include "jpake.h" 77 #include "roaming.h" 78 79 #ifdef GSSAPI 80 static Gssctxt *gsscontext = NULL; 81 #endif 82 83 /* Imports */ 84 extern ServerOptions options; 85 extern u_int utmp_len; 86 extern Newkeys *current_keys[]; 87 extern z_stream incoming_stream; 88 extern z_stream outgoing_stream; 89 extern u_char session_id[]; 90 extern Buffer auth_debug; 91 extern int auth_debug_init; 92 extern Buffer loginmsg; 93 94 /* State exported from the child */ 95 96 struct { 97 z_stream incoming; 98 z_stream outgoing; 99 u_char *keyin; 100 u_int keyinlen; 101 u_char *keyout; 102 u_int keyoutlen; 103 u_char *ivin; 104 u_int ivinlen; 105 u_char *ivout; 106 u_int ivoutlen; 107 u_char *ssh1key; 108 u_int ssh1keylen; 109 int ssh1cipher; 110 int ssh1protoflags; 111 u_char *input; 112 u_int ilen; 113 u_char *output; 114 u_int olen; 115 u_int64_t sent_bytes; 116 u_int64_t recv_bytes; 117 } child_state; 118 119 /* Functions on the monitor that answer unprivileged requests */ 120 121 int mm_answer_moduli(int, Buffer *); 122 int mm_answer_sign(int, Buffer *); 123 int mm_answer_pwnamallow(int, Buffer *); 124 int mm_answer_auth2_read_banner(int, Buffer *); 125 int mm_answer_authserv(int, Buffer *); 126 int mm_answer_authpassword(int, Buffer *); 127 int mm_answer_bsdauthquery(int, Buffer *); 128 int mm_answer_bsdauthrespond(int, Buffer *); 129 int mm_answer_skeyquery(int, Buffer *); 130 int mm_answer_skeyrespond(int, Buffer *); 131 int mm_answer_keyallowed(int, Buffer *); 132 int mm_answer_keyverify(int, Buffer *); 133 int mm_answer_pty(int, Buffer *); 134 int mm_answer_pty_cleanup(int, Buffer *); 135 int mm_answer_term(int, Buffer *); 136 int mm_answer_rsa_keyallowed(int, Buffer *); 137 int mm_answer_rsa_challenge(int, Buffer *); 138 int mm_answer_rsa_response(int, Buffer *); 139 int mm_answer_sesskey(int, Buffer *); 140 int mm_answer_sessid(int, Buffer *); 141 int mm_answer_jpake_get_pwdata(int, Buffer *); 142 int mm_answer_jpake_step1(int, Buffer *); 143 int mm_answer_jpake_step2(int, Buffer *); 144 int mm_answer_jpake_key_confirm(int, Buffer *); 145 int mm_answer_jpake_check_confirm(int, Buffer *); 146 147 #ifdef GSSAPI 148 int mm_answer_gss_setup_ctx(int, Buffer *); 149 int mm_answer_gss_accept_ctx(int, Buffer *); 150 int mm_answer_gss_userok(int, Buffer *); 151 int mm_answer_gss_checkmic(int, Buffer *); 152 #endif 153 154 static int monitor_read_log(struct monitor *); 155 156 static Authctxt *authctxt; 157 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ 158 159 /* local state for key verify */ 160 static u_char *key_blob = NULL; 161 static u_int key_bloblen = 0; 162 static int key_blobtype = MM_NOKEY; 163 static char *hostbased_cuser = NULL; 164 static char *hostbased_chost = NULL; 165 static char *auth_method = "unknown"; 166 static char *auth_submethod = NULL; 167 static u_int session_id2_len = 0; 168 static u_char *session_id2 = NULL; 169 static pid_t monitor_child_pid; 170 171 struct mon_table { 172 enum monitor_reqtype type; 173 int flags; 174 int (*f)(int, Buffer *); 175 }; 176 177 #define MON_ISAUTH 0x0004 /* Required for Authentication */ 178 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ 179 #define MON_ONCE 0x0010 /* Disable after calling */ 180 #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ 181 182 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) 183 184 #define MON_PERMIT 0x1000 /* Request is permitted */ 185 186 struct mon_table mon_dispatch_proto20[] = { 187 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, 188 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, 189 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, 190 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, 191 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, 192 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 193 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 194 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, 195 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, 196 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, 197 #ifdef GSSAPI 198 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, 199 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, 200 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, 201 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, 202 #endif 203 #ifdef JPAKE 204 {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata}, 205 {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1}, 206 {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2}, 207 {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm}, 208 {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm}, 209 #endif 210 {0, 0, NULL} 211 }; 212 213 struct mon_table mon_dispatch_postauth20[] = { 214 {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, 215 {MONITOR_REQ_SIGN, 0, mm_answer_sign}, 216 {MONITOR_REQ_PTY, 0, mm_answer_pty}, 217 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, 218 {MONITOR_REQ_TERM, 0, mm_answer_term}, 219 {0, 0, NULL} 220 }; 221 222 struct mon_table mon_dispatch_proto15[] = { 223 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, 224 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, 225 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, 226 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 227 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, 228 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, 229 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, 230 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, 231 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 232 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, 233 {0, 0, NULL} 234 }; 235 236 struct mon_table mon_dispatch_postauth15[] = { 237 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, 238 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, 239 {MONITOR_REQ_TERM, 0, mm_answer_term}, 240 {0, 0, NULL} 241 }; 242 243 struct mon_table *mon_dispatch; 244 245 /* Specifies if a certain message is allowed at the moment */ 246 247 static void 248 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) 249 { 250 while (ent->f != NULL) { 251 if (ent->type == type) { 252 ent->flags &= ~MON_PERMIT; 253 ent->flags |= permit ? MON_PERMIT : 0; 254 return; 255 } 256 ent++; 257 } 258 } 259 260 static void 261 monitor_permit_authentications(int permit) 262 { 263 struct mon_table *ent = mon_dispatch; 264 265 while (ent->f != NULL) { 266 if (ent->flags & MON_AUTH) { 267 ent->flags &= ~MON_PERMIT; 268 ent->flags |= permit ? MON_PERMIT : 0; 269 } 270 ent++; 271 } 272 } 273 274 void 275 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) 276 { 277 struct mon_table *ent; 278 int authenticated = 0, partial = 0; 279 280 debug3("preauth child monitor started"); 281 282 close(pmonitor->m_recvfd); 283 close(pmonitor->m_log_sendfd); 284 pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1; 285 286 authctxt = _authctxt; 287 memset(authctxt, 0, sizeof(*authctxt)); 288 289 if (compat20) { 290 mon_dispatch = mon_dispatch_proto20; 291 292 /* Permit requests for moduli and signatures */ 293 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 294 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 295 } else { 296 mon_dispatch = mon_dispatch_proto15; 297 298 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); 299 } 300 301 /* The first few requests do not require asynchronous access */ 302 while (!authenticated) { 303 partial = 0; 304 auth_method = "unknown"; 305 auth_submethod = NULL; 306 authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); 307 308 /* Special handling for multiple required authentications */ 309 if (options.num_auth_methods != 0) { 310 if (!compat20) 311 fatal("AuthenticationMethods is not supported" 312 "with SSH protocol 1"); 313 if (authenticated && 314 !auth2_update_methods_lists(authctxt, 315 auth_method, 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 compat20 ? " ssh2" : ""); 335 if (!authenticated) 336 authctxt->failures++; 337 } 338 #ifdef JPAKE 339 /* Cleanup JPAKE context after authentication */ 340 if (ent->flags & MON_AUTHDECIDE) { 341 if (authctxt->jpake_ctx != NULL) { 342 jpake_free(authctxt->jpake_ctx); 343 authctxt->jpake_ctx = NULL; 344 } 345 } 346 #endif 347 } 348 349 if (!authctxt->valid) 350 fatal("%s: authenticated invalid user", __func__); 351 if (strcmp(auth_method, "unknown") == 0) 352 fatal("%s: authentication method name unknown", __func__); 353 354 debug("%s: %s has been authenticated by privileged process", 355 __func__, authctxt->user); 356 357 mm_get_keystate(pmonitor); 358 359 /* Drain any buffered messages from the child */ 360 while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0) 361 ; 362 363 close(pmonitor->m_sendfd); 364 close(pmonitor->m_log_recvfd); 365 pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1; 366 } 367 368 static void 369 monitor_set_child_handler(pid_t pid) 370 { 371 monitor_child_pid = pid; 372 } 373 374 static void 375 monitor_child_handler(int sig) 376 { 377 kill(monitor_child_pid, sig); 378 } 379 380 void 381 monitor_child_postauth(struct monitor *pmonitor) 382 { 383 close(pmonitor->m_recvfd); 384 pmonitor->m_recvfd = -1; 385 386 monitor_set_child_handler(pmonitor->m_pid); 387 signal(SIGHUP, &monitor_child_handler); 388 signal(SIGTERM, &monitor_child_handler); 389 signal(SIGINT, &monitor_child_handler); 390 391 if (compat20) { 392 mon_dispatch = mon_dispatch_postauth20; 393 394 /* Permit requests for moduli and signatures */ 395 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 396 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 397 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 398 } else { 399 mon_dispatch = mon_dispatch_postauth15; 400 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 401 } 402 if (!no_pty_flag) { 403 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); 404 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); 405 } 406 407 for (;;) 408 monitor_read(pmonitor, mon_dispatch, NULL); 409 } 410 411 void 412 monitor_sync(struct monitor *pmonitor) 413 { 414 if (options.compression) { 415 /* The member allocation is not visible, so sync it */ 416 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); 417 } 418 } 419 420 static int 421 monitor_read_log(struct monitor *pmonitor) 422 { 423 Buffer logmsg; 424 u_int len, level; 425 char *msg; 426 427 buffer_init(&logmsg); 428 429 /* Read length */ 430 buffer_append_space(&logmsg, 4); 431 if (atomicio(read, pmonitor->m_log_recvfd, 432 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) { 433 if (errno == EPIPE) { 434 buffer_free(&logmsg); 435 debug("%s: child log fd closed", __func__); 436 close(pmonitor->m_log_recvfd); 437 pmonitor->m_log_recvfd = -1; 438 return -1; 439 } 440 fatal("%s: log fd read: %s", __func__, strerror(errno)); 441 } 442 len = buffer_get_int(&logmsg); 443 if (len <= 4 || len > 8192) 444 fatal("%s: invalid log message length %u", __func__, len); 445 446 /* Read severity, message */ 447 buffer_clear(&logmsg); 448 buffer_append_space(&logmsg, len); 449 if (atomicio(read, pmonitor->m_log_recvfd, 450 buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) 451 fatal("%s: log fd read: %s", __func__, strerror(errno)); 452 453 /* Log it */ 454 level = buffer_get_int(&logmsg); 455 msg = buffer_get_string(&logmsg, NULL); 456 if (log_level_name(level) == NULL) 457 fatal("%s: invalid log level %u (corrupted message?)", 458 __func__, level); 459 do_log2(level, "%s [preauth]", msg); 460 461 buffer_free(&logmsg); 462 xfree(msg); 463 464 return 0; 465 } 466 467 int 468 monitor_read(struct monitor *pmonitor, struct mon_table *ent, 469 struct mon_table **pent) 470 { 471 Buffer m; 472 int ret; 473 u_char type; 474 struct pollfd pfd[2]; 475 476 for (;;) { 477 bzero(&pfd, sizeof(pfd)); 478 pfd[0].fd = pmonitor->m_sendfd; 479 pfd[0].events = POLLIN; 480 pfd[1].fd = pmonitor->m_log_recvfd; 481 pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN; 482 if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) { 483 if (errno == EINTR || errno == EAGAIN) 484 continue; 485 fatal("%s: poll: %s", __func__, strerror(errno)); 486 } 487 if (pfd[1].revents) { 488 /* 489 * Drain all log messages before processing next 490 * monitor request. 491 */ 492 monitor_read_log(pmonitor); 493 continue; 494 } 495 if (pfd[0].revents) 496 break; /* Continues below */ 497 } 498 499 buffer_init(&m); 500 501 mm_request_receive(pmonitor->m_sendfd, &m); 502 type = buffer_get_char(&m); 503 504 debug3("%s: checking request %d", __func__, type); 505 506 while (ent->f != NULL) { 507 if (ent->type == type) 508 break; 509 ent++; 510 } 511 512 if (ent->f != NULL) { 513 if (!(ent->flags & MON_PERMIT)) 514 fatal("%s: unpermitted request %d", __func__, 515 type); 516 ret = (*ent->f)(pmonitor->m_sendfd, &m); 517 buffer_free(&m); 518 519 /* The child may use this request only once, disable it */ 520 if (ent->flags & MON_ONCE) { 521 debug2("%s: %d used once, disabling now", __func__, 522 type); 523 ent->flags &= ~MON_PERMIT; 524 } 525 526 if (pent != NULL) 527 *pent = ent; 528 529 return ret; 530 } 531 532 fatal("%s: unsupported request: %d", __func__, type); 533 534 /* NOTREACHED */ 535 return (-1); 536 } 537 538 /* allowed key state */ 539 static int 540 monitor_allowed_key(u_char *blob, u_int bloblen) 541 { 542 /* make sure key is allowed */ 543 if (key_blob == NULL || key_bloblen != bloblen || 544 timingsafe_bcmp(key_blob, blob, key_bloblen)) 545 return (0); 546 return (1); 547 } 548 549 static void 550 monitor_reset_key_state(void) 551 { 552 /* reset state */ 553 if (key_blob != NULL) 554 xfree(key_blob); 555 if (hostbased_cuser != NULL) 556 xfree(hostbased_cuser); 557 if (hostbased_chost != NULL) 558 xfree(hostbased_chost); 559 key_blob = NULL; 560 key_bloblen = 0; 561 key_blobtype = MM_NOKEY; 562 hostbased_cuser = NULL; 563 hostbased_chost = NULL; 564 } 565 566 int 567 mm_answer_moduli(int sock, Buffer *m) 568 { 569 DH *dh; 570 int min, want, max; 571 572 min = buffer_get_int(m); 573 want = buffer_get_int(m); 574 max = buffer_get_int(m); 575 576 debug3("%s: got parameters: %d %d %d", 577 __func__, min, want, max); 578 /* We need to check here, too, in case the child got corrupted */ 579 if (max < min || want < min || max < want) 580 fatal("%s: bad parameters: %d %d %d", 581 __func__, min, want, max); 582 583 buffer_clear(m); 584 585 dh = choose_dh(min, want, max); 586 if (dh == NULL) { 587 buffer_put_char(m, 0); 588 return (0); 589 } else { 590 /* Send first bignum */ 591 buffer_put_char(m, 1); 592 buffer_put_bignum2(m, dh->p); 593 buffer_put_bignum2(m, dh->g); 594 595 DH_free(dh); 596 } 597 mm_request_send(sock, MONITOR_ANS_MODULI, m); 598 return (0); 599 } 600 601 int 602 mm_answer_sign(int sock, Buffer *m) 603 { 604 Key *key; 605 u_char *p; 606 u_char *signature; 607 u_int siglen, datlen; 608 int keyid; 609 610 debug3("%s", __func__); 611 612 keyid = buffer_get_int(m); 613 p = buffer_get_string(m, &datlen); 614 615 /* 616 * Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes), 617 * SHA384 (48 bytes) and SHA512 (64 bytes). 618 */ 619 if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64) 620 fatal("%s: data length incorrect: %u", __func__, datlen); 621 622 /* save session id, it will be passed on the first call */ 623 if (session_id2_len == 0) { 624 session_id2_len = datlen; 625 session_id2 = xmalloc(session_id2_len); 626 memcpy(session_id2, p, session_id2_len); 627 } 628 629 if ((key = get_hostkey_by_index(keyid)) == NULL) 630 fatal("%s: no hostkey from index %d", __func__, keyid); 631 if (key_sign(key, &signature, &siglen, p, datlen) < 0) 632 fatal("%s: key_sign failed", __func__); 633 634 debug3("%s: signature %p(%u)", __func__, signature, siglen); 635 636 buffer_clear(m); 637 buffer_put_string(m, signature, siglen); 638 639 xfree(p); 640 xfree(signature); 641 642 mm_request_send(sock, MONITOR_ANS_SIGN, m); 643 644 /* Turn on permissions for getpwnam */ 645 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 646 647 return (0); 648 } 649 650 /* Retrieves the password entry and also checks if the user is permitted */ 651 652 int 653 mm_answer_pwnamallow(int sock, Buffer *m) 654 { 655 char *username; 656 struct passwd *pwent; 657 int allowed = 0; 658 u_int i; 659 660 debug3("%s", __func__); 661 662 if (authctxt->attempt++ != 0) 663 fatal("%s: multiple attempts for getpwnam", __func__); 664 665 username = buffer_get_string(m, NULL); 666 667 pwent = getpwnamallow(username); 668 669 authctxt->user = xstrdup(username); 670 setproctitle("%s [priv]", pwent ? username : "unknown"); 671 xfree(username); 672 673 buffer_clear(m); 674 675 if (pwent == NULL) { 676 buffer_put_char(m, 0); 677 authctxt->pw = fakepw(); 678 goto out; 679 } 680 681 allowed = 1; 682 authctxt->pw = pwent; 683 authctxt->valid = 1; 684 685 buffer_put_char(m, 1); 686 buffer_put_string(m, pwent, sizeof(struct passwd)); 687 buffer_put_cstring(m, pwent->pw_name); 688 buffer_put_cstring(m, "*"); 689 buffer_put_cstring(m, pwent->pw_gecos); 690 buffer_put_cstring(m, pwent->pw_class); 691 buffer_put_cstring(m, pwent->pw_dir); 692 buffer_put_cstring(m, pwent->pw_shell); 693 694 out: 695 buffer_put_string(m, &options, sizeof(options)); 696 697 #define M_CP_STROPT(x) do { \ 698 if (options.x != NULL) \ 699 buffer_put_cstring(m, options.x); \ 700 } while (0) 701 #define M_CP_STRARRAYOPT(x, nx) do { \ 702 for (i = 0; i < options.nx; i++) \ 703 buffer_put_cstring(m, options.x[i]); \ 704 } while (0) 705 /* See comment in servconf.h */ 706 COPY_MATCH_STRING_OPTS(); 707 #undef M_CP_STROPT 708 #undef M_CP_STRARRAYOPT 709 710 /* Create valid auth method lists */ 711 if (compat20 && auth2_setup_methods_lists(authctxt) != 0) { 712 /* 713 * The monitor will continue long enough to let the child 714 * run to it's packet_disconnect(), but it must not allow any 715 * authentication to succeed. 716 */ 717 debug("%s: no valid authentication method lists", __func__); 718 } 719 720 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); 721 mm_request_send(sock, MONITOR_ANS_PWNAM, m); 722 723 /* For SSHv1 allow authentication now */ 724 if (!compat20) 725 monitor_permit_authentications(1); 726 else { 727 /* Allow service/style information on the auth context */ 728 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); 729 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); 730 } 731 732 return (0); 733 } 734 735 int mm_answer_auth2_read_banner(int sock, Buffer *m) 736 { 737 char *banner; 738 739 buffer_clear(m); 740 banner = auth2_read_banner(); 741 buffer_put_cstring(m, banner != NULL ? banner : ""); 742 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); 743 744 if (banner != NULL) 745 xfree(banner); 746 747 return (0); 748 } 749 750 int 751 mm_answer_authserv(int sock, Buffer *m) 752 { 753 monitor_permit_authentications(1); 754 755 authctxt->service = buffer_get_string(m, NULL); 756 authctxt->style = buffer_get_string(m, NULL); 757 debug3("%s: service=%s, style=%s", 758 __func__, authctxt->service, authctxt->style); 759 760 if (strlen(authctxt->style) == 0) { 761 xfree(authctxt->style); 762 authctxt->style = NULL; 763 } 764 765 return (0); 766 } 767 768 int 769 mm_answer_authpassword(int sock, Buffer *m) 770 { 771 static int call_count; 772 char *passwd; 773 int authenticated; 774 u_int plen; 775 776 passwd = buffer_get_string(m, &plen); 777 /* Only authenticate if the context is valid */ 778 authenticated = options.password_authentication && 779 auth_password(authctxt, passwd); 780 memset(passwd, 0, strlen(passwd)); 781 xfree(passwd); 782 783 buffer_clear(m); 784 buffer_put_int(m, authenticated); 785 786 debug3("%s: sending result %d", __func__, authenticated); 787 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); 788 789 call_count++; 790 if (plen == 0 && call_count == 1) 791 auth_method = "none"; 792 else 793 auth_method = "password"; 794 795 /* Causes monitor loop to terminate if authenticated */ 796 return (authenticated); 797 } 798 799 int 800 mm_answer_bsdauthquery(int sock, Buffer *m) 801 { 802 char *name, *infotxt; 803 u_int numprompts; 804 u_int *echo_on; 805 char **prompts; 806 u_int success; 807 808 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, 809 &prompts, &echo_on) < 0 ? 0 : 1; 810 811 buffer_clear(m); 812 buffer_put_int(m, success); 813 if (success) 814 buffer_put_cstring(m, prompts[0]); 815 816 debug3("%s: sending challenge success: %u", __func__, success); 817 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); 818 819 if (success) { 820 xfree(name); 821 xfree(infotxt); 822 xfree(prompts); 823 xfree(echo_on); 824 } 825 826 return (0); 827 } 828 829 int 830 mm_answer_bsdauthrespond(int sock, Buffer *m) 831 { 832 char *response; 833 int authok; 834 835 if (authctxt->as == 0) 836 fatal("%s: no bsd auth session", __func__); 837 838 response = buffer_get_string(m, NULL); 839 authok = options.challenge_response_authentication && 840 auth_userresponse(authctxt->as, response, 0); 841 authctxt->as = NULL; 842 debug3("%s: <%s> = <%d>", __func__, response, authok); 843 xfree(response); 844 845 buffer_clear(m); 846 buffer_put_int(m, authok); 847 848 debug3("%s: sending authenticated: %d", __func__, authok); 849 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); 850 851 if (compat20) { 852 auth_method = "keyboard-interactive"; 853 auth_submethod = "bsdauth"; 854 } else 855 auth_method = "bsdauth"; 856 857 return (authok != 0); 858 } 859 860 int 861 mm_answer_keyallowed(int sock, Buffer *m) 862 { 863 Key *key; 864 char *cuser, *chost; 865 u_char *blob; 866 u_int bloblen; 867 enum mm_keytype type = 0; 868 int allowed = 0; 869 870 debug3("%s entering", __func__); 871 872 type = buffer_get_int(m); 873 cuser = buffer_get_string(m, NULL); 874 chost = buffer_get_string(m, NULL); 875 blob = buffer_get_string(m, &bloblen); 876 877 key = key_from_blob(blob, bloblen); 878 879 if ((compat20 && type == MM_RSAHOSTKEY) || 880 (!compat20 && type != MM_RSAHOSTKEY)) 881 fatal("%s: key type and protocol mismatch", __func__); 882 883 debug3("%s: key_from_blob: %p", __func__, key); 884 885 if (key != NULL && authctxt->valid) { 886 switch (type) { 887 case MM_USERKEY: 888 allowed = options.pubkey_authentication && 889 user_key_allowed(authctxt->pw, key); 890 auth_method = "publickey"; 891 if (options.pubkey_authentication && allowed != 1) 892 auth_clear_options(); 893 break; 894 case MM_HOSTKEY: 895 allowed = options.hostbased_authentication && 896 hostbased_key_allowed(authctxt->pw, 897 cuser, chost, key); 898 auth_method = "hostbased"; 899 break; 900 case MM_RSAHOSTKEY: 901 key->type = KEY_RSA1; /* XXX */ 902 allowed = options.rhosts_rsa_authentication && 903 auth_rhosts_rsa_key_allowed(authctxt->pw, 904 cuser, chost, key); 905 if (options.rhosts_rsa_authentication && allowed != 1) 906 auth_clear_options(); 907 auth_method = "rsa"; 908 break; 909 default: 910 fatal("%s: unknown key type %d", __func__, type); 911 break; 912 } 913 } 914 if (key != NULL) 915 key_free(key); 916 917 /* clear temporarily storage (used by verify) */ 918 monitor_reset_key_state(); 919 920 if (allowed) { 921 /* Save temporarily for comparison in verify */ 922 key_blob = blob; 923 key_bloblen = bloblen; 924 key_blobtype = type; 925 hostbased_cuser = cuser; 926 hostbased_chost = chost; 927 } else { 928 /* Log failed attempt */ 929 auth_log(authctxt, 0, 0, auth_method, NULL, 930 compat20 ? " ssh2" : ""); 931 xfree(blob); 932 xfree(cuser); 933 xfree(chost); 934 } 935 936 debug3("%s: key %p is %s", 937 __func__, key, allowed ? "allowed" : "not allowed"); 938 939 buffer_clear(m); 940 buffer_put_int(m, allowed); 941 buffer_put_int(m, forced_command != NULL); 942 943 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); 944 945 if (type == MM_RSAHOSTKEY) 946 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 947 948 return (0); 949 } 950 951 static int 952 monitor_valid_userblob(u_char *data, u_int datalen) 953 { 954 Buffer b; 955 char *p, *userstyle; 956 u_int len; 957 int fail = 0; 958 959 buffer_init(&b); 960 buffer_append(&b, data, datalen); 961 962 if (datafellows & SSH_OLD_SESSIONID) { 963 p = buffer_ptr(&b); 964 len = buffer_len(&b); 965 if ((session_id2 == NULL) || 966 (len < session_id2_len) || 967 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 968 fail++; 969 buffer_consume(&b, session_id2_len); 970 } else { 971 p = buffer_get_string(&b, &len); 972 if ((session_id2 == NULL) || 973 (len != session_id2_len) || 974 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 975 fail++; 976 xfree(p); 977 } 978 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 979 fail++; 980 p = buffer_get_cstring(&b, NULL); 981 xasprintf(&userstyle, "%s%s%s", authctxt->user, 982 authctxt->style ? ":" : "", 983 authctxt->style ? authctxt->style : ""); 984 if (strcmp(userstyle, p) != 0) { 985 logit("wrong user name passed to monitor: expected %s != %.100s", 986 userstyle, p); 987 fail++; 988 } 989 xfree(userstyle); 990 xfree(p); 991 buffer_skip_string(&b); 992 if (datafellows & SSH_BUG_PKAUTH) { 993 if (!buffer_get_char(&b)) 994 fail++; 995 } else { 996 p = buffer_get_cstring(&b, NULL); 997 if (strcmp("publickey", p) != 0) 998 fail++; 999 xfree(p); 1000 if (!buffer_get_char(&b)) 1001 fail++; 1002 buffer_skip_string(&b); 1003 } 1004 buffer_skip_string(&b); 1005 if (buffer_len(&b) != 0) 1006 fail++; 1007 buffer_free(&b); 1008 return (fail == 0); 1009 } 1010 1011 static int 1012 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, 1013 char *chost) 1014 { 1015 Buffer b; 1016 char *p, *userstyle; 1017 u_int len; 1018 int fail = 0; 1019 1020 buffer_init(&b); 1021 buffer_append(&b, data, datalen); 1022 1023 p = buffer_get_string(&b, &len); 1024 if ((session_id2 == NULL) || 1025 (len != session_id2_len) || 1026 (timingsafe_bcmp(p, session_id2, session_id2_len) != 0)) 1027 fail++; 1028 xfree(p); 1029 1030 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 1031 fail++; 1032 p = buffer_get_cstring(&b, NULL); 1033 xasprintf(&userstyle, "%s%s%s", authctxt->user, 1034 authctxt->style ? ":" : "", 1035 authctxt->style ? authctxt->style : ""); 1036 if (strcmp(userstyle, p) != 0) { 1037 logit("wrong user name passed to monitor: expected %s != %.100s", 1038 userstyle, p); 1039 fail++; 1040 } 1041 free(userstyle); 1042 xfree(p); 1043 buffer_skip_string(&b); /* service */ 1044 p = buffer_get_cstring(&b, NULL); 1045 if (strcmp(p, "hostbased") != 0) 1046 fail++; 1047 xfree(p); 1048 buffer_skip_string(&b); /* pkalg */ 1049 buffer_skip_string(&b); /* pkblob */ 1050 1051 /* verify client host, strip trailing dot if necessary */ 1052 p = buffer_get_string(&b, NULL); 1053 if (((len = strlen(p)) > 0) && p[len - 1] == '.') 1054 p[len - 1] = '\0'; 1055 if (strcmp(p, chost) != 0) 1056 fail++; 1057 xfree(p); 1058 1059 /* verify client user */ 1060 p = buffer_get_string(&b, NULL); 1061 if (strcmp(p, cuser) != 0) 1062 fail++; 1063 xfree(p); 1064 1065 if (buffer_len(&b) != 0) 1066 fail++; 1067 buffer_free(&b); 1068 return (fail == 0); 1069 } 1070 1071 int 1072 mm_answer_keyverify(int sock, Buffer *m) 1073 { 1074 Key *key; 1075 u_char *signature, *data, *blob; 1076 u_int signaturelen, datalen, bloblen; 1077 int verified = 0; 1078 int valid_data = 0; 1079 1080 blob = buffer_get_string(m, &bloblen); 1081 signature = buffer_get_string(m, &signaturelen); 1082 data = buffer_get_string(m, &datalen); 1083 1084 if (hostbased_cuser == NULL || hostbased_chost == NULL || 1085 !monitor_allowed_key(blob, bloblen)) 1086 fatal("%s: bad key, not previously allowed", __func__); 1087 1088 key = key_from_blob(blob, bloblen); 1089 if (key == NULL) 1090 fatal("%s: bad public key blob", __func__); 1091 1092 switch (key_blobtype) { 1093 case MM_USERKEY: 1094 valid_data = monitor_valid_userblob(data, datalen); 1095 break; 1096 case MM_HOSTKEY: 1097 valid_data = monitor_valid_hostbasedblob(data, datalen, 1098 hostbased_cuser, hostbased_chost); 1099 break; 1100 default: 1101 valid_data = 0; 1102 break; 1103 } 1104 if (!valid_data) 1105 fatal("%s: bad signature data blob", __func__); 1106 1107 verified = key_verify(key, signature, signaturelen, data, datalen); 1108 debug3("%s: key %p signature %s", 1109 __func__, key, (verified == 1) ? "verified" : "unverified"); 1110 1111 key_free(key); 1112 xfree(blob); 1113 xfree(signature); 1114 xfree(data); 1115 1116 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; 1117 1118 monitor_reset_key_state(); 1119 1120 buffer_clear(m); 1121 buffer_put_int(m, verified); 1122 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); 1123 1124 return (verified == 1); 1125 } 1126 1127 static void 1128 mm_record_login(Session *s, struct passwd *pw) 1129 { 1130 socklen_t fromlen; 1131 struct sockaddr_storage from; 1132 1133 /* 1134 * Get IP address of client. If the connection is not a socket, let 1135 * the address be 0.0.0.0. 1136 */ 1137 memset(&from, 0, sizeof(from)); 1138 fromlen = sizeof(from); 1139 if (packet_connection_is_on_socket()) { 1140 if (getpeername(packet_get_connection_in(), 1141 (struct sockaddr *)&from, &fromlen) < 0) { 1142 debug("getpeername: %.100s", strerror(errno)); 1143 cleanup_exit(255); 1144 } 1145 } 1146 /* Record that there was a login on that tty from the remote host. */ 1147 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, 1148 get_remote_name_or_ip(utmp_len, options.use_dns), 1149 (struct sockaddr *)&from, fromlen); 1150 } 1151 1152 static void 1153 mm_session_close(Session *s) 1154 { 1155 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); 1156 if (s->ttyfd != -1) { 1157 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); 1158 session_pty_cleanup2(s); 1159 } 1160 session_unused(s->self); 1161 } 1162 1163 int 1164 mm_answer_pty(int sock, Buffer *m) 1165 { 1166 extern struct monitor *pmonitor; 1167 Session *s; 1168 int res, fd0; 1169 1170 debug3("%s entering", __func__); 1171 1172 buffer_clear(m); 1173 s = session_new(); 1174 if (s == NULL) 1175 goto error; 1176 s->authctxt = authctxt; 1177 s->pw = authctxt->pw; 1178 s->pid = pmonitor->m_pid; 1179 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); 1180 if (res == 0) 1181 goto error; 1182 pty_setowner(authctxt->pw, s->tty); 1183 1184 buffer_put_int(m, 1); 1185 buffer_put_cstring(m, s->tty); 1186 1187 /* We need to trick ttyslot */ 1188 if (dup2(s->ttyfd, 0) == -1) 1189 fatal("%s: dup2", __func__); 1190 1191 mm_record_login(s, authctxt->pw); 1192 1193 /* Now we can close the file descriptor again */ 1194 close(0); 1195 1196 /* send messages generated by record_login */ 1197 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); 1198 buffer_clear(&loginmsg); 1199 1200 mm_request_send(sock, MONITOR_ANS_PTY, m); 1201 1202 if (mm_send_fd(sock, s->ptyfd) == -1 || 1203 mm_send_fd(sock, s->ttyfd) == -1) 1204 fatal("%s: send fds failed", __func__); 1205 1206 /* make sure nothing uses fd 0 */ 1207 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) 1208 fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); 1209 if (fd0 != 0) 1210 error("%s: fd0 %d != 0", __func__, fd0); 1211 1212 /* slave is not needed */ 1213 close(s->ttyfd); 1214 s->ttyfd = s->ptyfd; 1215 /* no need to dup() because nobody closes ptyfd */ 1216 s->ptymaster = s->ptyfd; 1217 1218 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); 1219 1220 return (0); 1221 1222 error: 1223 if (s != NULL) 1224 mm_session_close(s); 1225 buffer_put_int(m, 0); 1226 mm_request_send(sock, MONITOR_ANS_PTY, m); 1227 return (0); 1228 } 1229 1230 int 1231 mm_answer_pty_cleanup(int sock, Buffer *m) 1232 { 1233 Session *s; 1234 char *tty; 1235 1236 debug3("%s entering", __func__); 1237 1238 tty = buffer_get_string(m, NULL); 1239 if ((s = session_by_tty(tty)) != NULL) 1240 mm_session_close(s); 1241 buffer_clear(m); 1242 xfree(tty); 1243 return (0); 1244 } 1245 1246 int 1247 mm_answer_sesskey(int sock, Buffer *m) 1248 { 1249 BIGNUM *p; 1250 int rsafail; 1251 1252 /* Turn off permissions */ 1253 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); 1254 1255 if ((p = BN_new()) == NULL) 1256 fatal("%s: BN_new", __func__); 1257 1258 buffer_get_bignum2(m, p); 1259 1260 rsafail = ssh1_session_key(p); 1261 1262 buffer_clear(m); 1263 buffer_put_int(m, rsafail); 1264 buffer_put_bignum2(m, p); 1265 1266 BN_clear_free(p); 1267 1268 mm_request_send(sock, MONITOR_ANS_SESSKEY, m); 1269 1270 /* Turn on permissions for sessid passing */ 1271 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); 1272 1273 return (0); 1274 } 1275 1276 int 1277 mm_answer_sessid(int sock, Buffer *m) 1278 { 1279 int i; 1280 1281 debug3("%s entering", __func__); 1282 1283 if (buffer_len(m) != 16) 1284 fatal("%s: bad ssh1 session id", __func__); 1285 for (i = 0; i < 16; i++) 1286 session_id[i] = buffer_get_char(m); 1287 1288 /* Turn on permissions for getpwnam */ 1289 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 1290 1291 return (0); 1292 } 1293 1294 int 1295 mm_answer_rsa_keyallowed(int sock, Buffer *m) 1296 { 1297 BIGNUM *client_n; 1298 Key *key = NULL; 1299 u_char *blob = NULL; 1300 u_int blen = 0; 1301 int allowed = 0; 1302 1303 debug3("%s entering", __func__); 1304 1305 auth_method = "rsa"; 1306 if (options.rsa_authentication && authctxt->valid) { 1307 if ((client_n = BN_new()) == NULL) 1308 fatal("%s: BN_new", __func__); 1309 buffer_get_bignum2(m, client_n); 1310 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); 1311 BN_clear_free(client_n); 1312 } 1313 buffer_clear(m); 1314 buffer_put_int(m, allowed); 1315 buffer_put_int(m, forced_command != NULL); 1316 1317 /* clear temporarily storage (used by generate challenge) */ 1318 monitor_reset_key_state(); 1319 1320 if (allowed && key != NULL) { 1321 key->type = KEY_RSA; /* cheat for key_to_blob */ 1322 if (key_to_blob(key, &blob, &blen) == 0) 1323 fatal("%s: key_to_blob failed", __func__); 1324 buffer_put_string(m, blob, blen); 1325 1326 /* Save temporarily for comparison in verify */ 1327 key_blob = blob; 1328 key_bloblen = blen; 1329 key_blobtype = MM_RSAUSERKEY; 1330 } 1331 if (key != NULL) 1332 key_free(key); 1333 1334 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); 1335 1336 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 1337 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); 1338 return (0); 1339 } 1340 1341 int 1342 mm_answer_rsa_challenge(int sock, Buffer *m) 1343 { 1344 Key *key = NULL; 1345 u_char *blob; 1346 u_int blen; 1347 1348 debug3("%s entering", __func__); 1349 1350 if (!authctxt->valid) 1351 fatal("%s: authctxt not valid", __func__); 1352 blob = buffer_get_string(m, &blen); 1353 if (!monitor_allowed_key(blob, blen)) 1354 fatal("%s: bad key, not previously allowed", __func__); 1355 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1356 fatal("%s: key type mismatch", __func__); 1357 if ((key = key_from_blob(blob, blen)) == NULL) 1358 fatal("%s: received bad key", __func__); 1359 if (key->type != KEY_RSA) 1360 fatal("%s: received bad key type %d", __func__, key->type); 1361 key->type = KEY_RSA1; 1362 if (ssh1_challenge) 1363 BN_clear_free(ssh1_challenge); 1364 ssh1_challenge = auth_rsa_generate_challenge(key); 1365 1366 buffer_clear(m); 1367 buffer_put_bignum2(m, ssh1_challenge); 1368 1369 debug3("%s sending reply", __func__); 1370 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); 1371 1372 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); 1373 1374 xfree(blob); 1375 key_free(key); 1376 return (0); 1377 } 1378 1379 int 1380 mm_answer_rsa_response(int sock, Buffer *m) 1381 { 1382 Key *key = NULL; 1383 u_char *blob, *response; 1384 u_int blen, len; 1385 int success; 1386 1387 debug3("%s entering", __func__); 1388 1389 if (!authctxt->valid) 1390 fatal("%s: authctxt not valid", __func__); 1391 if (ssh1_challenge == NULL) 1392 fatal("%s: no ssh1_challenge", __func__); 1393 1394 blob = buffer_get_string(m, &blen); 1395 if (!monitor_allowed_key(blob, blen)) 1396 fatal("%s: bad key, not previously allowed", __func__); 1397 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1398 fatal("%s: key type mismatch: %d", __func__, key_blobtype); 1399 if ((key = key_from_blob(blob, blen)) == NULL) 1400 fatal("%s: received bad key", __func__); 1401 response = buffer_get_string(m, &len); 1402 if (len != 16) 1403 fatal("%s: received bad response to challenge", __func__); 1404 success = auth_rsa_verify_response(key, ssh1_challenge, response); 1405 1406 xfree(blob); 1407 key_free(key); 1408 xfree(response); 1409 1410 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; 1411 1412 /* reset state */ 1413 BN_clear_free(ssh1_challenge); 1414 ssh1_challenge = NULL; 1415 monitor_reset_key_state(); 1416 1417 buffer_clear(m); 1418 buffer_put_int(m, success); 1419 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); 1420 1421 return (success); 1422 } 1423 1424 int 1425 mm_answer_term(int sock, Buffer *req) 1426 { 1427 extern struct monitor *pmonitor; 1428 int res, status; 1429 1430 debug3("%s: tearing down sessions", __func__); 1431 1432 /* The child is terminating */ 1433 session_destroy_all(&mm_session_close); 1434 1435 while (waitpid(pmonitor->m_pid, &status, 0) == -1) 1436 if (errno != EINTR) 1437 exit(1); 1438 1439 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; 1440 1441 /* Terminate process */ 1442 exit(res); 1443 } 1444 1445 void 1446 monitor_apply_keystate(struct monitor *pmonitor) 1447 { 1448 if (compat20) { 1449 set_newkeys(MODE_IN); 1450 set_newkeys(MODE_OUT); 1451 } else { 1452 packet_set_protocol_flags(child_state.ssh1protoflags); 1453 packet_set_encryption_key(child_state.ssh1key, 1454 child_state.ssh1keylen, child_state.ssh1cipher); 1455 xfree(child_state.ssh1key); 1456 } 1457 1458 /* for rc4 and other stateful ciphers */ 1459 packet_set_keycontext(MODE_OUT, child_state.keyout); 1460 xfree(child_state.keyout); 1461 packet_set_keycontext(MODE_IN, child_state.keyin); 1462 xfree(child_state.keyin); 1463 1464 if (!compat20) { 1465 packet_set_iv(MODE_OUT, child_state.ivout); 1466 xfree(child_state.ivout); 1467 packet_set_iv(MODE_IN, child_state.ivin); 1468 xfree(child_state.ivin); 1469 } 1470 1471 memcpy(&incoming_stream, &child_state.incoming, 1472 sizeof(incoming_stream)); 1473 memcpy(&outgoing_stream, &child_state.outgoing, 1474 sizeof(outgoing_stream)); 1475 1476 /* Update with new address */ 1477 if (options.compression) 1478 mm_init_compression(pmonitor->m_zlib); 1479 1480 /* Network I/O buffers */ 1481 /* XXX inefficient for large buffers, need: buffer_init_from_string */ 1482 buffer_clear(packet_get_input()); 1483 buffer_append(packet_get_input(), child_state.input, child_state.ilen); 1484 memset(child_state.input, 0, child_state.ilen); 1485 xfree(child_state.input); 1486 1487 buffer_clear(packet_get_output()); 1488 buffer_append(packet_get_output(), child_state.output, 1489 child_state.olen); 1490 memset(child_state.output, 0, child_state.olen); 1491 xfree(child_state.output); 1492 1493 /* Roaming */ 1494 if (compat20) 1495 roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes); 1496 } 1497 1498 static Kex * 1499 mm_get_kex(Buffer *m) 1500 { 1501 Kex *kex; 1502 void *blob; 1503 u_int bloblen; 1504 1505 kex = xcalloc(1, sizeof(*kex)); 1506 kex->session_id = buffer_get_string(m, &kex->session_id_len); 1507 if (session_id2 == NULL || 1508 kex->session_id_len != session_id2_len || 1509 timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0) 1510 fatal("mm_get_get: internal error: bad session id"); 1511 kex->we_need = buffer_get_int(m); 1512 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; 1513 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; 1514 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; 1515 kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; 1516 kex->kex[KEX_ECDH_SHA2] = kexecdh_server; 1517 kex->server = 1; 1518 kex->hostkey_type = buffer_get_int(m); 1519 kex->kex_type = buffer_get_int(m); 1520 blob = buffer_get_string(m, &bloblen); 1521 buffer_init(&kex->my); 1522 buffer_append(&kex->my, blob, bloblen); 1523 xfree(blob); 1524 blob = buffer_get_string(m, &bloblen); 1525 buffer_init(&kex->peer); 1526 buffer_append(&kex->peer, blob, bloblen); 1527 xfree(blob); 1528 kex->done = 1; 1529 kex->flags = buffer_get_int(m); 1530 kex->client_version_string = buffer_get_string(m, NULL); 1531 kex->server_version_string = buffer_get_string(m, NULL); 1532 kex->load_host_public_key=&get_hostkey_public_by_type; 1533 kex->load_host_private_key=&get_hostkey_private_by_type; 1534 kex->host_key_index=&get_hostkey_index; 1535 1536 return (kex); 1537 } 1538 1539 /* This function requries careful sanity checking */ 1540 1541 void 1542 mm_get_keystate(struct monitor *pmonitor) 1543 { 1544 Buffer m; 1545 u_char *blob, *p; 1546 u_int bloblen, plen; 1547 u_int32_t seqnr, packets; 1548 u_int64_t blocks, bytes; 1549 1550 debug3("%s: Waiting for new keys", __func__); 1551 1552 buffer_init(&m); 1553 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); 1554 if (!compat20) { 1555 child_state.ssh1protoflags = buffer_get_int(&m); 1556 child_state.ssh1cipher = buffer_get_int(&m); 1557 child_state.ssh1key = buffer_get_string(&m, 1558 &child_state.ssh1keylen); 1559 child_state.ivout = buffer_get_string(&m, 1560 &child_state.ivoutlen); 1561 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); 1562 goto skip; 1563 } else { 1564 /* Get the Kex for rekeying */ 1565 *pmonitor->m_pkex = mm_get_kex(&m); 1566 } 1567 1568 blob = buffer_get_string(&m, &bloblen); 1569 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); 1570 xfree(blob); 1571 1572 debug3("%s: Waiting for second key", __func__); 1573 blob = buffer_get_string(&m, &bloblen); 1574 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); 1575 xfree(blob); 1576 1577 /* Now get sequence numbers for the packets */ 1578 seqnr = buffer_get_int(&m); 1579 blocks = buffer_get_int64(&m); 1580 packets = buffer_get_int(&m); 1581 bytes = buffer_get_int64(&m); 1582 packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes); 1583 seqnr = buffer_get_int(&m); 1584 blocks = buffer_get_int64(&m); 1585 packets = buffer_get_int(&m); 1586 bytes = buffer_get_int64(&m); 1587 packet_set_state(MODE_IN, seqnr, blocks, packets, bytes); 1588 1589 skip: 1590 /* Get the key context */ 1591 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); 1592 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); 1593 1594 debug3("%s: Getting compression state", __func__); 1595 /* Get compression state */ 1596 p = buffer_get_string(&m, &plen); 1597 if (plen != sizeof(child_state.outgoing)) 1598 fatal("%s: bad request size", __func__); 1599 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); 1600 xfree(p); 1601 1602 p = buffer_get_string(&m, &plen); 1603 if (plen != sizeof(child_state.incoming)) 1604 fatal("%s: bad request size", __func__); 1605 memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); 1606 xfree(p); 1607 1608 /* Network I/O buffers */ 1609 debug3("%s: Getting Network I/O buffers", __func__); 1610 child_state.input = buffer_get_string(&m, &child_state.ilen); 1611 child_state.output = buffer_get_string(&m, &child_state.olen); 1612 1613 /* Roaming */ 1614 if (compat20) { 1615 child_state.sent_bytes = buffer_get_int64(&m); 1616 child_state.recv_bytes = buffer_get_int64(&m); 1617 } 1618 1619 buffer_free(&m); 1620 } 1621 1622 1623 /* Allocation functions for zlib */ 1624 void * 1625 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) 1626 { 1627 size_t len = (size_t) size * ncount; 1628 void *address; 1629 1630 if (len == 0 || ncount > SIZE_T_MAX / size) 1631 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); 1632 1633 address = mm_malloc(mm, len); 1634 1635 return (address); 1636 } 1637 1638 void 1639 mm_zfree(struct mm_master *mm, void *address) 1640 { 1641 mm_free(mm, address); 1642 } 1643 1644 void 1645 mm_init_compression(struct mm_master *mm) 1646 { 1647 outgoing_stream.zalloc = (alloc_func)mm_zalloc; 1648 outgoing_stream.zfree = (free_func)mm_zfree; 1649 outgoing_stream.opaque = mm; 1650 1651 incoming_stream.zalloc = (alloc_func)mm_zalloc; 1652 incoming_stream.zfree = (free_func)mm_zfree; 1653 incoming_stream.opaque = mm; 1654 } 1655 1656 /* XXX */ 1657 1658 #define FD_CLOSEONEXEC(x) do { \ 1659 if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \ 1660 fatal("fcntl(%d, F_SETFD)", x); \ 1661 } while (0) 1662 1663 static void 1664 monitor_openfds(struct monitor *mon, int do_logfds) 1665 { 1666 int pair[2]; 1667 1668 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) 1669 fatal("%s: socketpair: %s", __func__, strerror(errno)); 1670 FD_CLOSEONEXEC(pair[0]); 1671 FD_CLOSEONEXEC(pair[1]); 1672 mon->m_recvfd = pair[0]; 1673 mon->m_sendfd = pair[1]; 1674 1675 if (do_logfds) { 1676 if (pipe(pair) == -1) 1677 fatal("%s: pipe: %s", __func__, strerror(errno)); 1678 FD_CLOSEONEXEC(pair[0]); 1679 FD_CLOSEONEXEC(pair[1]); 1680 mon->m_log_recvfd = pair[0]; 1681 mon->m_log_sendfd = pair[1]; 1682 } else 1683 mon->m_log_recvfd = mon->m_log_sendfd = -1; 1684 } 1685 1686 #define MM_MEMSIZE 65536 1687 1688 struct monitor * 1689 monitor_init(void) 1690 { 1691 struct monitor *mon; 1692 1693 mon = xcalloc(1, sizeof(*mon)); 1694 1695 monitor_openfds(mon, 1); 1696 1697 /* Used to share zlib space across processes */ 1698 if (options.compression) { 1699 mon->m_zback = mm_create(NULL, MM_MEMSIZE); 1700 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); 1701 1702 /* Compression needs to share state across borders */ 1703 mm_init_compression(mon->m_zlib); 1704 } 1705 1706 return mon; 1707 } 1708 1709 void 1710 monitor_reinit(struct monitor *mon) 1711 { 1712 monitor_openfds(mon, 0); 1713 } 1714 1715 #ifdef GSSAPI 1716 int 1717 mm_answer_gss_setup_ctx(int sock, Buffer *m) 1718 { 1719 gss_OID_desc goid; 1720 OM_uint32 major; 1721 u_int len; 1722 1723 goid.elements = buffer_get_string(m, &len); 1724 goid.length = len; 1725 1726 major = ssh_gssapi_server_ctx(&gsscontext, &goid); 1727 1728 xfree(goid.elements); 1729 1730 buffer_clear(m); 1731 buffer_put_int(m, major); 1732 1733 mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); 1734 1735 /* Now we have a context, enable the step */ 1736 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); 1737 1738 return (0); 1739 } 1740 1741 int 1742 mm_answer_gss_accept_ctx(int sock, Buffer *m) 1743 { 1744 gss_buffer_desc in; 1745 gss_buffer_desc out = GSS_C_EMPTY_BUFFER; 1746 OM_uint32 major, minor; 1747 OM_uint32 flags = 0; /* GSI needs this */ 1748 u_int len; 1749 1750 in.value = buffer_get_string(m, &len); 1751 in.length = len; 1752 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); 1753 xfree(in.value); 1754 1755 buffer_clear(m); 1756 buffer_put_int(m, major); 1757 buffer_put_string(m, out.value, out.length); 1758 buffer_put_int(m, flags); 1759 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); 1760 1761 gss_release_buffer(&minor, &out); 1762 1763 if (major == GSS_S_COMPLETE) { 1764 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); 1765 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1766 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); 1767 } 1768 return (0); 1769 } 1770 1771 int 1772 mm_answer_gss_checkmic(int sock, Buffer *m) 1773 { 1774 gss_buffer_desc gssbuf, mic; 1775 OM_uint32 ret; 1776 u_int len; 1777 1778 gssbuf.value = buffer_get_string(m, &len); 1779 gssbuf.length = len; 1780 mic.value = buffer_get_string(m, &len); 1781 mic.length = len; 1782 1783 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); 1784 1785 xfree(gssbuf.value); 1786 xfree(mic.value); 1787 1788 buffer_clear(m); 1789 buffer_put_int(m, ret); 1790 1791 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); 1792 1793 if (!GSS_ERROR(ret)) 1794 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1795 1796 return (0); 1797 } 1798 1799 int 1800 mm_answer_gss_userok(int sock, Buffer *m) 1801 { 1802 int authenticated; 1803 1804 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); 1805 1806 buffer_clear(m); 1807 buffer_put_int(m, authenticated); 1808 1809 debug3("%s: sending result %d", __func__, authenticated); 1810 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); 1811 1812 auth_method = "gssapi-with-mic"; 1813 1814 /* Monitor loop will terminate if authenticated */ 1815 return (authenticated); 1816 } 1817 #endif /* GSSAPI */ 1818 1819 #ifdef JPAKE 1820 int 1821 mm_answer_jpake_step1(int sock, Buffer *m) 1822 { 1823 struct jpake_ctx *pctx; 1824 u_char *x3_proof, *x4_proof; 1825 u_int x3_proof_len, x4_proof_len; 1826 1827 if (!options.zero_knowledge_password_authentication) 1828 fatal("zero_knowledge_password_authentication disabled"); 1829 1830 if (authctxt->jpake_ctx != NULL) 1831 fatal("%s: authctxt->jpake_ctx already set (%p)", 1832 __func__, authctxt->jpake_ctx); 1833 authctxt->jpake_ctx = pctx = jpake_new(); 1834 1835 jpake_step1(pctx->grp, 1836 &pctx->server_id, &pctx->server_id_len, 1837 &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4, 1838 &x3_proof, &x3_proof_len, 1839 &x4_proof, &x4_proof_len); 1840 1841 JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__)); 1842 1843 buffer_clear(m); 1844 1845 buffer_put_string(m, pctx->server_id, pctx->server_id_len); 1846 buffer_put_bignum2(m, pctx->g_x3); 1847 buffer_put_bignum2(m, pctx->g_x4); 1848 buffer_put_string(m, x3_proof, x3_proof_len); 1849 buffer_put_string(m, x4_proof, x4_proof_len); 1850 1851 debug3("%s: sending step1", __func__); 1852 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m); 1853 1854 bzero(x3_proof, x3_proof_len); 1855 bzero(x4_proof, x4_proof_len); 1856 xfree(x3_proof); 1857 xfree(x4_proof); 1858 1859 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1); 1860 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0); 1861 1862 return 0; 1863 } 1864 1865 int 1866 mm_answer_jpake_get_pwdata(int sock, Buffer *m) 1867 { 1868 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1869 char *hash_scheme, *salt; 1870 1871 if (pctx == NULL) 1872 fatal("%s: pctx == NULL", __func__); 1873 1874 auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt); 1875 1876 buffer_clear(m); 1877 /* pctx->s is sensitive, not returned to slave */ 1878 buffer_put_cstring(m, hash_scheme); 1879 buffer_put_cstring(m, salt); 1880 1881 debug3("%s: sending pwdata", __func__); 1882 mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m); 1883 1884 bzero(hash_scheme, strlen(hash_scheme)); 1885 bzero(salt, strlen(salt)); 1886 xfree(hash_scheme); 1887 xfree(salt); 1888 1889 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1); 1890 1891 return 0; 1892 } 1893 1894 int 1895 mm_answer_jpake_step2(int sock, Buffer *m) 1896 { 1897 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1898 u_char *x1_proof, *x2_proof, *x4_s_proof; 1899 u_int x1_proof_len, x2_proof_len, x4_s_proof_len; 1900 1901 if (pctx == NULL) 1902 fatal("%s: pctx == NULL", __func__); 1903 1904 if ((pctx->g_x1 = BN_new()) == NULL || 1905 (pctx->g_x2 = BN_new()) == NULL) 1906 fatal("%s: BN_new", __func__); 1907 buffer_get_bignum2(m, pctx->g_x1); 1908 buffer_get_bignum2(m, pctx->g_x2); 1909 pctx->client_id = buffer_get_string(m, &pctx->client_id_len); 1910 x1_proof = buffer_get_string(m, &x1_proof_len); 1911 x2_proof = buffer_get_string(m, &x2_proof_len); 1912 1913 jpake_step2(pctx->grp, pctx->s, pctx->g_x3, 1914 pctx->g_x1, pctx->g_x2, pctx->x4, 1915 pctx->client_id, pctx->client_id_len, 1916 pctx->server_id, pctx->server_id_len, 1917 x1_proof, x1_proof_len, 1918 x2_proof, x2_proof_len, 1919 &pctx->b, 1920 &x4_s_proof, &x4_s_proof_len); 1921 1922 JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__)); 1923 1924 bzero(x1_proof, x1_proof_len); 1925 bzero(x2_proof, x2_proof_len); 1926 xfree(x1_proof); 1927 xfree(x2_proof); 1928 1929 buffer_clear(m); 1930 1931 buffer_put_bignum2(m, pctx->b); 1932 buffer_put_string(m, x4_s_proof, x4_s_proof_len); 1933 1934 debug3("%s: sending step2", __func__); 1935 mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m); 1936 1937 bzero(x4_s_proof, x4_s_proof_len); 1938 xfree(x4_s_proof); 1939 1940 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1); 1941 1942 return 0; 1943 } 1944 1945 int 1946 mm_answer_jpake_key_confirm(int sock, Buffer *m) 1947 { 1948 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1949 u_char *x2_s_proof; 1950 u_int x2_s_proof_len; 1951 1952 if (pctx == NULL) 1953 fatal("%s: pctx == NULL", __func__); 1954 1955 if ((pctx->a = BN_new()) == NULL) 1956 fatal("%s: BN_new", __func__); 1957 buffer_get_bignum2(m, pctx->a); 1958 x2_s_proof = buffer_get_string(m, &x2_s_proof_len); 1959 1960 jpake_key_confirm(pctx->grp, pctx->s, pctx->a, 1961 pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2, 1962 pctx->server_id, pctx->server_id_len, 1963 pctx->client_id, pctx->client_id_len, 1964 session_id2, session_id2_len, 1965 x2_s_proof, x2_s_proof_len, 1966 &pctx->k, 1967 &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len); 1968 1969 JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__)); 1970 1971 bzero(x2_s_proof, x2_s_proof_len); 1972 buffer_clear(m); 1973 1974 /* pctx->k is sensitive, not sent */ 1975 buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len); 1976 1977 debug3("%s: sending confirmation hash", __func__); 1978 mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m); 1979 1980 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1); 1981 1982 return 0; 1983 } 1984 1985 int 1986 mm_answer_jpake_check_confirm(int sock, Buffer *m) 1987 { 1988 int authenticated = 0; 1989 u_char *peer_confirm_hash; 1990 u_int peer_confirm_hash_len; 1991 struct jpake_ctx *pctx = authctxt->jpake_ctx; 1992 1993 if (pctx == NULL) 1994 fatal("%s: pctx == NULL", __func__); 1995 1996 peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len); 1997 1998 authenticated = jpake_check_confirm(pctx->k, 1999 pctx->client_id, pctx->client_id_len, 2000 session_id2, session_id2_len, 2001 peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid; 2002 2003 JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__)); 2004 2005 bzero(peer_confirm_hash, peer_confirm_hash_len); 2006 xfree(peer_confirm_hash); 2007 2008 buffer_clear(m); 2009 buffer_put_int(m, authenticated); 2010 2011 debug3("%s: sending result %d", __func__, authenticated); 2012 mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m); 2013 2014 monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1); 2015 2016 auth_method = "jpake-01@openssh.com"; 2017 return authenticated; 2018 } 2019 2020 #endif /* JPAKE */ 2021