andersk Git - gssapi-openssh.git/blame_incremental - openssh/monitor.c andersk / gssapi-openssh.git / blame_incremental commit grep author committer pickaxe ? search: re summary | shortlog | log | commit | commitdiff | tree blob | blame (non-incremental) | history | HEAD fix compiler warnings: initialize pointer and change int to u_int [gssapi-openssh.git] / openssh / monitor.c This page requires JavaScript to run. Use this page instead. ... / ... Commit Line Data 1 /* 2 * Copyright 2002 Niels Provos
3 * Copyright 2002 Markus Friedl 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "includes.h" 28 RCSID("$OpenBSD: monitor.c,v 1.63 2005/03/10 22:01:05 deraadt Exp $"); 29 30 #include 31 32 #ifdef SKEY 33 #include 34 #endif 35 36 #include "ssh.h" 37 #include "auth.h" 38 #include "kex.h" 39 #include "dh.h" 40 #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ 41 #undef TARGET_OS_MAC 42 #include "zlib.h" 43 #define TARGET_OS_MAC 1 44 #else 45 #include "zlib.h" 46 #endif 47 #include "packet.h" 48 #include "auth-options.h" 49 #include "sshpty.h" 50 #include "channels.h" 51 #include "session.h" 52 #include "sshlogin.h" 53 #include "canohost.h" 54 #include "log.h" 55 #include "servconf.h" 56 #include "monitor.h" 57 #include "monitor_mm.h" 58 #include "monitor_wrap.h" 59 #include "monitor_fdpass.h" 60 #include "xmalloc.h" 61 #include "misc.h" 62 #include "buffer.h" 63 #include "bufaux.h" 64 #include "compat.h" 65 #include "ssh2.h" 66 67 #ifdef GSSAPI 68 #include "ssh-gss.h" 69 static Gssctxt *gsscontext = NULL; 70 #endif 71 72 /* Imports */ 73 extern ServerOptions options; 74 extern u_int utmp_len; 75 extern Newkeys *current_keys[]; 76 extern z_stream incoming_stream; 77 extern z_stream outgoing_stream; 78 extern u_char session_id[]; 79 extern Buffer input, output; 80 extern Buffer auth_debug; 81 extern int auth_debug_init; 82 extern Buffer loginmsg; 83 84 /* State exported from the child */ 85 86 struct { 87 z_stream incoming; 88 z_stream outgoing; 89 u_char *keyin; 90 u_int keyinlen; 91 u_char *keyout; 92 u_int keyoutlen; 93 u_char *ivin; 94 u_int ivinlen; 95 u_char *ivout; 96 u_int ivoutlen; 97 u_char *ssh1key; 98 u_int ssh1keylen; 99 int ssh1cipher; 100 int ssh1protoflags; 101 u_char *input; 102 u_int ilen; 103 u_char *output; 104 u_int olen; 105 } child_state; 106 107 /* Functions on the monitor that answer unprivileged requests */ 108 109 int mm_answer_moduli(int, Buffer *); 110 int mm_answer_sign(int, Buffer *); 111 int mm_answer_pwnamallow(int, Buffer *); 112 int mm_answer_auth2_read_banner(int, Buffer *); 113 int mm_answer_authserv(int, Buffer *); 114 int mm_answer_authpassword(int, Buffer *); 115 int mm_answer_bsdauthquery(int, Buffer *); 116 int mm_answer_bsdauthrespond(int, Buffer *); 117 int mm_answer_skeyquery(int, Buffer *); 118 int mm_answer_skeyrespond(int, Buffer *); 119 int mm_answer_keyallowed(int, Buffer *); 120 int mm_answer_keyverify(int, Buffer *); 121 int mm_answer_pty(int, Buffer *); 122 int mm_answer_pty_cleanup(int, Buffer *); 123 int mm_answer_term(int, Buffer *); 124 int mm_answer_rsa_keyallowed(int, Buffer *); 125 int mm_answer_rsa_challenge(int, Buffer *); 126 int mm_answer_rsa_response(int, Buffer *); 127 int mm_answer_sesskey(int, Buffer *); 128 int mm_answer_sessid(int, Buffer *); 129 130 #ifdef USE_PAM 131 int mm_answer_pam_start(int, Buffer *); 132 int mm_answer_pam_account(int, Buffer *); 133 int mm_answer_pam_init_ctx(int, Buffer *); 134 int mm_answer_pam_query(int, Buffer *); 135 int mm_answer_pam_respond(int, Buffer *); 136 int mm_answer_pam_free_ctx(int, Buffer *); 137 #endif 138 139 #ifdef GSSAPI 140 int mm_answer_gss_setup_ctx(int, Buffer *); 141 int mm_answer_gss_accept_ctx(int, Buffer *); 142 int mm_answer_gss_userok(int, Buffer *); 143 int mm_answer_gss_checkmic(int, Buffer *); 144 #endif 145 146 #ifdef GSSAPI 147 int mm_answer_gss_setup_ctx(int, Buffer *); 148 int mm_answer_gss_accept_ctx(int, Buffer *); 149 int mm_answer_gss_userok(int, Buffer *); 150 int mm_answer_gss_sign(int, Buffer *); 151 int mm_answer_gss_error(int, Buffer *); 152 int mm_answer_gss_indicate_mechs(int, Buffer *); 153 int mm_answer_gss_localname(int, Buffer *); 154 #endif 155 156 #ifdef SSH_AUDIT_EVENTS 157 int mm_answer_audit_event(int, Buffer *); 158 int mm_answer_audit_command(int, Buffer *); 159 #endif 160 161 static Authctxt *authctxt; 162 static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ 163 164 /* local state for key verify */ 165 static u_char *key_blob = NULL; 166 static u_int key_bloblen = 0; 167 static int key_blobtype = MM_NOKEY; 168 static char *hostbased_cuser = NULL; 169 static char *hostbased_chost = NULL; 170 static char *auth_method = "unknown"; 171 static u_int session_id2_len = 0; 172 static u_char *session_id2 = NULL; 173 static pid_t monitor_child_pid; 174 175 struct mon_table { 176 enum monitor_reqtype type; 177 int flags; 178 int (*f)(int, Buffer *); 179 }; 180 181 #define MON_ISAUTH 0x0004 /* Required for Authentication */ 182 #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ 183 #define MON_ONCE 0x0010 /* Disable after calling */ 184 185 #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) 186 187 #define MON_PERMIT 0x1000 /* Request is permitted */ 188 189 struct mon_table mon_dispatch_proto20[] = { 190 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, 191 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, 192 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow}, 193 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, 194 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, 195 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 196 #ifdef USE_PAM 197 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, 198 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, 199 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, 200 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, 201 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, 202 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, 203 #endif 204 #ifdef SSH_AUDIT_EVENTS 205 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, 206 #endif 207 #ifdef BSD_AUTH 208 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 209 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, 210 #endif 211 #ifdef SKEY 212 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, 213 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, 214 #endif 215 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, 216 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, 217 #ifdef GSSAPI 218 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, 219 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, 220 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, 221 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, 222 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error}, 223 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, 224 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname}, 225 {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, 226 #endif 227 {0, 0, NULL} 228 }; 229 230 struct mon_table mon_dispatch_postauth20[] = { 231 #ifdef GSSAPI 232 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx}, 233 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx}, 234 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign}, 235 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error}, 236 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs}, 237 #endif 238 {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, 239 {MONITOR_REQ_SIGN, 0, mm_answer_sign}, 240 {MONITOR_REQ_PTY, 0, mm_answer_pty}, 241 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, 242 {MONITOR_REQ_TERM, 0, mm_answer_term}, 243 #ifdef SSH_AUDIT_EVENTS 244 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, 245 {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, 246 #endif 247 {0, 0, NULL} 248 }; 249 250 struct mon_table mon_dispatch_proto15[] = { 251 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, 252 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, 253 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, 254 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, 255 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, 256 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, 257 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, 258 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, 259 #ifdef BSD_AUTH 260 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, 261 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, 262 #endif 263 #ifdef SKEY 264 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, 265 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, 266 #endif 267 #ifdef GSSAPI 268 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, 269 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, 270 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, 271 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, 272 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, 273 #endif 274 #ifdef USE_PAM 275 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, 276 {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, 277 {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, 278 {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, 279 {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, 280 {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, 281 #endif 282 #ifdef SSH_AUDIT_EVENTS 283 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, 284 #endif 285 {0, 0, NULL} 286 }; 287 288 struct mon_table mon_dispatch_postauth15[] = { 289 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, 290 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, 291 {MONITOR_REQ_TERM, 0, mm_answer_term}, 292 #ifdef SSH_AUDIT_EVENTS 293 {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, 294 {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, 295 #endif 296 {0, 0, NULL} 297 }; 298 299 struct mon_table *mon_dispatch; 300 301 /* Specifies if a certain message is allowed at the moment */ 302 303 static void 304 monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) 305 { 306 while (ent->f != NULL) { 307 if (ent->type == type) { 308 ent->flags &= ~MON_PERMIT; 309 ent->flags |= permit ? MON_PERMIT : 0; 310 return; 311 } 312 ent++; 313 } 314 } 315 316 static void 317 monitor_permit_authentications(int permit) 318 { 319 struct mon_table *ent = mon_dispatch; 320 321 while (ent->f != NULL) { 322 if (ent->flags & MON_AUTH) { 323 ent->flags &= ~MON_PERMIT; 324 ent->flags |= permit ? MON_PERMIT : 0; 325 } 326 ent++; 327 } 328 } 329 330 void 331 monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) 332 { 333 struct mon_table *ent; 334 int authenticated = 0; 335 336 debug3("preauth child monitor started"); 337 338 authctxt = _authctxt; 339 memset(authctxt, 0, sizeof(*authctxt)); 340 341 authctxt->loginmsg = &loginmsg; 342 343 if (compat20) { 344 mon_dispatch = mon_dispatch_proto20; 345 346 /* Permit requests for moduli and signatures */ 347 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 348 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 349 #ifdef GSSAPI 350 /* and for the GSSAPI key exchange */ 351 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1); 352 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); 353 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1); 354 #endif 355 } else { 356 mon_dispatch = mon_dispatch_proto15; 357 358 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); 359 } 360 361 /* The first few requests do not require asynchronous access */ 362 while (!authenticated) { 363 authenticated = monitor_read(pmonitor, mon_dispatch, &ent); 364 if (authenticated) { 365 if (!(ent->flags & MON_AUTHDECIDE)) 366 fatal("%s: unexpected authentication from %d", 367 __func__, ent->type); 368 if (authctxt->pw->pw_uid == 0 && 369 !auth_root_allowed(auth_method)) 370 authenticated = 0; 371 #ifdef USE_PAM 372 /* PAM needs to perform account checks after auth */ 373 if (options.use_pam && authenticated) { 374 Buffer m; 375 376 buffer_init(&m); 377 mm_request_receive_expect(pmonitor->m_sendfd, 378 MONITOR_REQ_PAM_ACCOUNT, &m); 379 authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); 380 buffer_free(&m); 381 } 382 #endif 383 } 384 385 if (ent->flags & MON_AUTHDECIDE) { 386 auth_log(authctxt, authenticated, auth_method, 387 compat20 ? " ssh2" : ""); 388 if (!authenticated) 389 authctxt->failures++; 390 } 391 } 392 393 if (!authctxt->valid) 394 fatal("%s: authenticated invalid user", __func__); 395 396 debug("%s: %s has been authenticated by privileged process", 397 __func__, authctxt->user); 398 399 mm_get_keystate(pmonitor); 400 } 401 402 static void 403 monitor_set_child_handler(pid_t pid) 404 { 405 monitor_child_pid = pid; 406 } 407 408 static void 409 monitor_child_handler(int sig) 410 { 411 kill(monitor_child_pid, sig); 412 } 413 414 void 415 monitor_child_postauth(struct monitor *pmonitor) 416 { 417 monitor_set_child_handler(pmonitor->m_pid); 418 signal(SIGHUP, &monitor_child_handler); 419 signal(SIGTERM, &monitor_child_handler); 420 421 if (compat20) { 422 mon_dispatch = mon_dispatch_postauth20; 423 424 /* Permit requests for moduli and signatures */ 425 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); 426 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); 427 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 428 429 #ifdef GSSAPI 430 /* and for the GSSAPI key exchange */ 431 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1); 432 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1); 433 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1); 434 #endif 435 436 } else { 437 mon_dispatch = mon_dispatch_postauth15; 438 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); 439 } 440 #ifdef GSSAPI 441 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); 442 #endif 443 if (!no_pty_flag) { 444 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); 445 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); 446 } 447 448 for (;;) 449 monitor_read(pmonitor, mon_dispatch, NULL); 450 } 451 452 void 453 monitor_sync(struct monitor *pmonitor) 454 { 455 if (options.compression) { 456 /* The member allocation is not visible, so sync it */ 457 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); 458 } 459 } 460 461 int 462 monitor_read(struct monitor *pmonitor, struct mon_table *ent, 463 struct mon_table **pent) 464 { 465 Buffer m; 466 int ret; 467 u_char type; 468 469 buffer_init(&m); 470 471 mm_request_receive(pmonitor->m_sendfd, &m); 472 type = buffer_get_char(&m); 473 474 debug3("%s: checking request %d", __func__, type); 475 476 while (ent->f != NULL) { 477 if (ent->type == type) 478 break; 479 ent++; 480 } 481 482 if (ent->f != NULL) { 483 if (!(ent->flags & MON_PERMIT)) 484 fatal("%s: unpermitted request %d", __func__, 485 type); 486 ret = (*ent->f)(pmonitor->m_sendfd, &m); 487 buffer_free(&m); 488 489 /* The child may use this request only once, disable it */ 490 if (ent->flags & MON_ONCE) { 491 debug2("%s: %d used once, disabling now", __func__, 492 type); 493 ent->flags &= ~MON_PERMIT; 494 } 495 496 if (pent != NULL) 497 *pent = ent; 498 499 return ret; 500 } 501 502 fatal("%s: unsupported request: %d", __func__, type); 503 504 /* NOTREACHED */ 505 return (-1); 506 } 507 508 /* allowed key state */ 509 static int 510 monitor_allowed_key(u_char *blob, u_int bloblen) 511 { 512 /* make sure key is allowed */ 513 if (key_blob == NULL || key_bloblen != bloblen || 514 memcmp(key_blob, blob, key_bloblen)) 515 return (0); 516 return (1); 517 } 518 519 static void 520 monitor_reset_key_state(void) 521 { 522 /* reset state */ 523 if (key_blob != NULL) 524 xfree(key_blob); 525 if (hostbased_cuser != NULL) 526 xfree(hostbased_cuser); 527 if (hostbased_chost != NULL) 528 xfree(hostbased_chost); 529 key_blob = NULL; 530 key_bloblen = 0; 531 key_blobtype = MM_NOKEY; 532 hostbased_cuser = NULL; 533 hostbased_chost = NULL; 534 } 535 536 int 537 mm_answer_moduli(int sock, Buffer *m) 538 { 539 DH *dh; 540 int min, want, max; 541 542 min = buffer_get_int(m); 543 want = buffer_get_int(m); 544 max = buffer_get_int(m); 545 546 debug3("%s: got parameters: %d %d %d", 547 __func__, min, want, max); 548 /* We need to check here, too, in case the child got corrupted */ 549 if (max < min || want < min || max < want) 550 fatal("%s: bad parameters: %d %d %d", 551 __func__, min, want, max); 552 553 buffer_clear(m); 554 555 dh = choose_dh(min, want, max); 556 if (dh == NULL) { 557 buffer_put_char(m, 0); 558 return (0); 559 } else { 560 /* Send first bignum */ 561 buffer_put_char(m, 1); 562 buffer_put_bignum2(m, dh->p); 563 buffer_put_bignum2(m, dh->g); 564 565 DH_free(dh); 566 } 567 mm_request_send(sock, MONITOR_ANS_MODULI, m); 568 return (0); 569 } 570 571 int 572 mm_answer_sign(int sock, Buffer *m) 573 { 574 Key *key; 575 u_char *p; 576 u_char *signature; 577 u_int siglen, datlen; 578 int keyid; 579 580 debug3("%s", __func__); 581 582 keyid = buffer_get_int(m); 583 p = buffer_get_string(m, &datlen); 584 585 if (datlen != 20) 586 fatal("%s: data length incorrect: %u", __func__, datlen); 587 588 /* save session id, it will be passed on the first call */ 589 if (session_id2_len == 0) { 590 session_id2_len = datlen; 591 session_id2 = xmalloc(session_id2_len); 592 memcpy(session_id2, p, session_id2_len); 593 } 594 595 if ((key = get_hostkey_by_index(keyid)) == NULL) 596 fatal("%s: no hostkey from index %d", __func__, keyid); 597 if (key_sign(key, &signature, &siglen, p, datlen) < 0) 598 fatal("%s: key_sign failed", __func__); 599 600 debug3("%s: signature %p(%u)", __func__, signature, siglen); 601 602 buffer_clear(m); 603 buffer_put_string(m, signature, siglen); 604 605 xfree(p); 606 xfree(signature); 607 608 mm_request_send(sock, MONITOR_ANS_SIGN, m); 609 610 /* Turn on permissions for getpwnam */ 611 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 612 613 return (0); 614 } 615 616 /* Retrieves the password entry and also checks if the user is permitted */ 617 618 int 619 mm_answer_pwnamallow(int sock, Buffer *m) 620 { 621 char *username; 622 struct passwd *pwent; 623 int allowed = 0; 624 625 debug3("%s", __func__); 626 627 username = buffer_get_string(m, NULL); 628 629 pwent = getpwnamallow(username); 630 631 if (authctxt->user) xfree(authctxt->user); 632 authctxt->user = xstrdup(username); 633 setproctitle("%s [priv]", pwent ? username : "unknown"); 634 xfree(username); 635 636 buffer_clear(m); 637 638 if (pwent == NULL) { 639 buffer_put_char(m, 0); 640 authctxt->pw = fakepw(); 641 goto out; 642 } 643 644 allowed = 1; 645 authctxt->pw = pwent; 646 authctxt->valid = 1; 647 648 buffer_put_char(m, 1); 649 buffer_put_string(m, pwent, sizeof(struct passwd)); 650 buffer_put_cstring(m, pwent->pw_name); 651 buffer_put_cstring(m, "*"); 652 buffer_put_cstring(m, pwent->pw_gecos); 653 #ifdef HAVE_PW_CLASS_IN_PASSWD 654 buffer_put_cstring(m, pwent->pw_class); 655 #endif 656 buffer_put_cstring(m, pwent->pw_dir); 657 buffer_put_cstring(m, pwent->pw_shell); 658 659 out: 660 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); 661 mm_request_send(sock, MONITOR_ANS_PWNAM, m); 662 663 /* For SSHv1 allow authentication now */ 664 if (!compat20) 665 monitor_permit_authentications(1); 666 else { 667 /* Allow service/style information on the auth context */ 668 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); 669 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); 670 } 671 672 #ifdef USE_PAM 673 if (options.use_pam) 674 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); 675 #endif 676 #ifdef SSH_AUDIT_EVENTS 677 monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); 678 #endif 679 680 return (0); 681 } 682 683 int mm_answer_auth2_read_banner(int sock, Buffer *m) 684 { 685 char *banner; 686 687 buffer_clear(m); 688 banner = auth2_read_banner(); 689 buffer_put_cstring(m, banner != NULL ? banner : ""); 690 mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); 691 692 if (banner != NULL) 693 xfree(banner); 694 695 return (0); 696 } 697 698 int 699 mm_answer_authserv(int sock, Buffer *m) 700 { 701 monitor_permit_authentications(1); 702 703 authctxt->service = buffer_get_string(m, NULL); 704 authctxt->style = buffer_get_string(m, NULL); 705 debug3("%s: service=%s, style=%s", 706 __func__, authctxt->service, authctxt->style); 707 708 if (strlen(authctxt->style) == 0) { 709 xfree(authctxt->style); 710 authctxt->style = NULL; 711 } 712 713 return (0); 714 } 715 716 int 717 mm_answer_authpassword(int sock, Buffer *m) 718 { 719 static int call_count; 720 char *passwd; 721 int authenticated; 722 u_int plen; 723 724 passwd = buffer_get_string(m, &plen); 725 /* Only authenticate if the context is valid */ 726 authenticated = options.password_authentication && 727 auth_password(authctxt, passwd); 728 memset(passwd, 0, strlen(passwd)); 729 xfree(passwd); 730 731 buffer_clear(m); 732 buffer_put_int(m, authenticated); 733 734 debug3("%s: sending result %d", __func__, authenticated); 735 mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); 736 737 call_count++; 738 if (plen == 0 && call_count == 1) 739 auth_method = "none"; 740 else 741 auth_method = "password"; 742 743 /* Causes monitor loop to terminate if authenticated */ 744 return (authenticated); 745 } 746 747 #ifdef BSD_AUTH 748 int 749 mm_answer_bsdauthquery(int sock, Buffer *m) 750 { 751 char *name, *infotxt; 752 u_int numprompts; 753 u_int *echo_on; 754 char **prompts; 755 u_int success; 756 757 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, 758 &prompts, &echo_on) < 0 ? 0 : 1; 759 760 buffer_clear(m); 761 buffer_put_int(m, success); 762 if (success) 763 buffer_put_cstring(m, prompts[0]); 764 765 debug3("%s: sending challenge success: %u", __func__, success); 766 mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); 767 768 if (success) { 769 xfree(name); 770 xfree(infotxt); 771 xfree(prompts); 772 xfree(echo_on); 773 } 774 775 return (0); 776 } 777 778 int 779 mm_answer_bsdauthrespond(int sock, Buffer *m) 780 { 781 char *response; 782 int authok; 783 784 if (authctxt->as == 0) 785 fatal("%s: no bsd auth session", __func__); 786 787 response = buffer_get_string(m, NULL); 788 authok = options.challenge_response_authentication && 789 auth_userresponse(authctxt->as, response, 0); 790 authctxt->as = NULL; 791 debug3("%s: <%s> = <%d>", __func__, response, authok); 792 xfree(response); 793 794 buffer_clear(m); 795 buffer_put_int(m, authok); 796 797 debug3("%s: sending authenticated: %d", __func__, authok); 798 mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); 799 800 auth_method = "bsdauth"; 801 802 return (authok != 0); 803 } 804 #endif 805 806 #ifdef SKEY 807 int 808 mm_answer_skeyquery(int sock, Buffer *m) 809 { 810 struct skey skey; 811 char challenge[1024]; 812 u_int success; 813 814 success = _compat_skeychallenge(&skey, authctxt->user, challenge, 815 sizeof(challenge)) < 0 ? 0 : 1; 816 817 buffer_clear(m); 818 buffer_put_int(m, success); 819 if (success) 820 buffer_put_cstring(m, challenge); 821 822 debug3("%s: sending challenge success: %u", __func__, success); 823 mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); 824 825 return (0); 826 } 827 828 int 829 mm_answer_skeyrespond(int sock, Buffer *m) 830 { 831 char *response; 832 int authok; 833 834 response = buffer_get_string(m, NULL); 835 836 authok = (options.challenge_response_authentication && 837 authctxt->valid && 838 skey_haskey(authctxt->pw->pw_name) == 0 && 839 skey_passcheck(authctxt->pw->pw_name, response) != -1); 840 841 xfree(response); 842 843 buffer_clear(m); 844 buffer_put_int(m, authok); 845 846 debug3("%s: sending authenticated: %d", __func__, authok); 847 mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); 848 849 auth_method = "skey"; 850 851 return (authok != 0); 852 } 853 #endif 854 855 #ifdef USE_PAM 856 int 857 mm_answer_pam_start(int sock, Buffer *m) 858 { 859 if (!options.use_pam) 860 fatal("UsePAM not set, but ended up in %s anyway", __func__); 861 862 start_pam(authctxt); 863 864 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); 865 866 return (0); 867 } 868 869 int 870 mm_answer_pam_account(int sock, Buffer *m) 871 { 872 u_int ret; 873 874 if (!options.use_pam) 875 fatal("UsePAM not set, but ended up in %s anyway", __func__); 876 877 ret = do_pam_account(); 878 879 buffer_put_int(m, ret); 880 buffer_append(&loginmsg, "\0", 1); 881 buffer_put_cstring(m, buffer_ptr(&loginmsg)); 882 buffer_clear(&loginmsg); 883 884 mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); 885 886 return (ret); 887 } 888 889 static void *sshpam_ctxt, *sshpam_authok; 890 extern KbdintDevice sshpam_device; 891 892 int 893 mm_answer_pam_init_ctx(int sock, Buffer *m) 894 { 895 896 debug3("%s", __func__); 897 authctxt->user = buffer_get_string(m, NULL); 898 sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); 899 sshpam_authok = NULL; 900 buffer_clear(m); 901 if (sshpam_ctxt != NULL) { 902 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); 903 buffer_put_int(m, 1); 904 } else { 905 buffer_put_int(m, 0); 906 } 907 mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); 908 return (0); 909 } 910 911 int 912 mm_answer_pam_query(int sock, Buffer *m) 913 { 914 char *name, *info, **prompts; 915 u_int i, num, *echo_on; 916 int ret; 917 918 debug3("%s", __func__); 919 sshpam_authok = NULL; 920 ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); 921 if (ret == 0 && num == 0) 922 sshpam_authok = sshpam_ctxt; 923 if (num > 1 || name == NULL || info == NULL) 924 ret = -1; 925 buffer_clear(m); 926 buffer_put_int(m, ret); 927 buffer_put_cstring(m, name); 928 xfree(name); 929 buffer_put_cstring(m, info); 930 xfree(info); 931 buffer_put_int(m, num); 932 for (i = 0; i < num; ++i) { 933 buffer_put_cstring(m, prompts[i]); 934 xfree(prompts[i]); 935 buffer_put_int(m, echo_on[i]); 936 } 937 if (prompts != NULL) 938 xfree(prompts); 939 if (echo_on != NULL) 940 xfree(echo_on); 941 mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); 942 return (0); 943 } 944 945 int 946 mm_answer_pam_respond(int sock, Buffer *m) 947 { 948 char **resp; 949 u_int i, num; 950 int ret; 951 952 debug3("%s", __func__); 953 sshpam_authok = NULL; 954 num = buffer_get_int(m); 955 if (num > 0) { 956 resp = xmalloc(num * sizeof(char *)); 957 for (i = 0; i < num; ++i) 958 resp[i] = buffer_get_string(m, NULL); 959 ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); 960 for (i = 0; i < num; ++i) 961 xfree(resp[i]); 962 xfree(resp); 963 } else { 964 ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); 965 } 966 buffer_clear(m); 967 buffer_put_int(m, ret); 968 mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); 969 auth_method = "keyboard-interactive/pam"; 970 if (ret == 0) 971 sshpam_authok = sshpam_ctxt; 972 return (0); 973 } 974 975 int 976 mm_answer_pam_free_ctx(int sock, Buffer *m) 977 { 978 979 debug3("%s", __func__); 980 (sshpam_device.free_ctx)(sshpam_ctxt); 981 buffer_clear(m); 982 mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); 983 return (sshpam_authok == sshpam_ctxt); 984 } 985 #endif 986 987 static void 988 mm_append_debug(Buffer *m) 989 { 990 if (auth_debug_init && buffer_len(&auth_debug)) { 991 debug3("%s: Appending debug messages for child", __func__); 992 buffer_append(m, buffer_ptr(&auth_debug), 993 buffer_len(&auth_debug)); 994 buffer_clear(&auth_debug); 995 } 996 } 997 998 int 999 mm_answer_keyallowed(int sock, Buffer *m) 1000 { 1001 Key *key; 1002 char *cuser, *chost; 1003 u_char *blob; 1004 u_int bloblen; 1005 enum mm_keytype type = 0; 1006 int allowed = 0; 1007 1008 debug3("%s entering", __func__); 1009 1010 type = buffer_get_int(m); 1011 cuser = buffer_get_string(m, NULL); 1012 chost = buffer_get_string(m, NULL); 1013 blob = buffer_get_string(m, &bloblen); 1014 1015 key = key_from_blob(blob, bloblen); 1016 1017 if ((compat20 && type == MM_RSAHOSTKEY) || 1018 (!compat20 && type != MM_RSAHOSTKEY)) 1019 fatal("%s: key type and protocol mismatch", __func__); 1020 1021 debug3("%s: key_from_blob: %p", __func__, key); 1022 1023 if (key != NULL && authctxt->valid) { 1024 switch (type) { 1025 case MM_USERKEY: 1026 allowed = options.pubkey_authentication && 1027 user_key_allowed(authctxt->pw, key); 1028 break; 1029 case MM_HOSTKEY: 1030 allowed = options.hostbased_authentication && 1031 hostbased_key_allowed(authctxt->pw, 1032 cuser, chost, key); 1033 break; 1034 case MM_RSAHOSTKEY: 1035 key->type = KEY_RSA1; /* XXX */ 1036 allowed = options.rhosts_rsa_authentication && 1037 auth_rhosts_rsa_key_allowed(authctxt->pw, 1038 cuser, chost, key); 1039 break; 1040 default: 1041 fatal("%s: unknown key type %d", __func__, type); 1042 break; 1043 } 1044 } 1045 if (key != NULL) 1046 key_free(key); 1047 1048 /* clear temporarily storage (used by verify) */ 1049 monitor_reset_key_state(); 1050 1051 if (allowed) { 1052 /* Save temporarily for comparison in verify */ 1053 key_blob = blob; 1054 key_bloblen = bloblen; 1055 key_blobtype = type; 1056 hostbased_cuser = cuser; 1057 hostbased_chost = chost; 1058 } 1059 1060 debug3("%s: key %p is %s", 1061 __func__, key, allowed ? "allowed" : "disallowed"); 1062 1063 buffer_clear(m); 1064 buffer_put_int(m, allowed); 1065 buffer_put_int(m, forced_command != NULL); 1066 1067 mm_append_debug(m); 1068 1069 mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); 1070 1071 if (type == MM_RSAHOSTKEY) 1072 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 1073 1074 return (0); 1075 } 1076 1077 static int 1078 monitor_valid_userblob(u_char *data, u_int datalen) 1079 { 1080 Buffer b; 1081 char *p; 1082 u_int len; 1083 int fail = 0; 1084 1085 buffer_init(&b); 1086 buffer_append(&b, data, datalen); 1087 1088 if (datafellows & SSH_OLD_SESSIONID) { 1089 p = buffer_ptr(&b); 1090 len = buffer_len(&b); 1091 if ((session_id2 == NULL) || 1092 (len < session_id2_len) || 1093 (memcmp(p, session_id2, session_id2_len) != 0)) 1094 fail++; 1095 buffer_consume(&b, session_id2_len); 1096 } else { 1097 p = buffer_get_string(&b, &len); 1098 if ((session_id2 == NULL) || 1099 (len != session_id2_len) || 1100 (memcmp(p, session_id2, session_id2_len) != 0)) 1101 fail++; 1102 xfree(p); 1103 } 1104 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 1105 fail++; 1106 p = buffer_get_string(&b, NULL); 1107 if (strcmp(authctxt->user, p) != 0) { 1108 logit("wrong user name passed to monitor: expected %s != %.100s", 1109 authctxt->user, p); 1110 fail++; 1111 } 1112 xfree(p); 1113 buffer_skip_string(&b); 1114 if (datafellows & SSH_BUG_PKAUTH) { 1115 if (!buffer_get_char(&b)) 1116 fail++; 1117 } else { 1118 p = buffer_get_string(&b, NULL); 1119 if (strcmp("publickey", p) != 0) 1120 fail++; 1121 xfree(p); 1122 if (!buffer_get_char(&b)) 1123 fail++; 1124 buffer_skip_string(&b); 1125 } 1126 buffer_skip_string(&b); 1127 if (buffer_len(&b) != 0) 1128 fail++; 1129 buffer_free(&b); 1130 return (fail == 0); 1131 } 1132 1133 static int 1134 monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, 1135 char *chost) 1136 { 1137 Buffer b; 1138 char *p; 1139 u_int len; 1140 int fail = 0; 1141 1142 buffer_init(&b); 1143 buffer_append(&b, data, datalen); 1144 1145 p = buffer_get_string(&b, &len); 1146 if ((session_id2 == NULL) || 1147 (len != session_id2_len) || 1148 (memcmp(p, session_id2, session_id2_len) != 0)) 1149 fail++; 1150 xfree(p); 1151 1152 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) 1153 fail++; 1154 p = buffer_get_string(&b, NULL); 1155 if (strcmp(authctxt->user, p) != 0) { 1156 logit("wrong user name passed to monitor: expected %s != %.100s", 1157 authctxt->user, p); 1158 fail++; 1159 } 1160 xfree(p); 1161 buffer_skip_string(&b); /* service */ 1162 p = buffer_get_string(&b, NULL); 1163 if (strcmp(p, "hostbased") != 0) 1164 fail++; 1165 xfree(p); 1166 buffer_skip_string(&b); /* pkalg */ 1167 buffer_skip_string(&b); /* pkblob */ 1168 1169 /* verify client host, strip trailing dot if necessary */ 1170 p = buffer_get_string(&b, NULL); 1171 if (((len = strlen(p)) > 0) && p[len - 1] == '.') 1172 p[len - 1] = '\0'; 1173 if (strcmp(p, chost) != 0) 1174 fail++; 1175 xfree(p); 1176 1177 /* verify client user */ 1178 p = buffer_get_string(&b, NULL); 1179 if (strcmp(p, cuser) != 0) 1180 fail++; 1181 xfree(p); 1182 1183 if (buffer_len(&b) != 0) 1184 fail++; 1185 buffer_free(&b); 1186 return (fail == 0); 1187 } 1188 1189 int 1190 mm_answer_keyverify(int sock, Buffer *m) 1191 { 1192 Key *key; 1193 u_char *signature, *data, *blob; 1194 u_int signaturelen, datalen, bloblen; 1195 int verified = 0; 1196 int valid_data = 0; 1197 1198 blob = buffer_get_string(m, &bloblen); 1199 signature = buffer_get_string(m, &signaturelen); 1200 data = buffer_get_string(m, &datalen); 1201 1202 if (hostbased_cuser == NULL || hostbased_chost == NULL || 1203 !monitor_allowed_key(blob, bloblen)) 1204 fatal("%s: bad key, not previously allowed", __func__); 1205 1206 key = key_from_blob(blob, bloblen); 1207 if (key == NULL) 1208 fatal("%s: bad public key blob", __func__); 1209 1210 switch (key_blobtype) { 1211 case MM_USERKEY: 1212 valid_data = monitor_valid_userblob(data, datalen); 1213 break; 1214 case MM_HOSTKEY: 1215 valid_data = monitor_valid_hostbasedblob(data, datalen, 1216 hostbased_cuser, hostbased_chost); 1217 break; 1218 default: 1219 valid_data = 0; 1220 break; 1221 } 1222 if (!valid_data) 1223 fatal("%s: bad signature data blob", __func__); 1224 1225 verified = key_verify(key, signature, signaturelen, data, datalen); 1226 debug3("%s: key %p signature %s", 1227 __func__, key, verified ? "verified" : "unverified"); 1228 1229 key_free(key); 1230 xfree(blob); 1231 xfree(signature); 1232 xfree(data); 1233 1234 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; 1235 1236 monitor_reset_key_state(); 1237 1238 buffer_clear(m); 1239 buffer_put_int(m, verified); 1240 mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); 1241 1242 return (verified); 1243 } 1244 1245 static void 1246 mm_record_login(Session *s, struct passwd *pw) 1247 { 1248 socklen_t fromlen; 1249 struct sockaddr_storage from; 1250 1251 /* 1252 * Get IP address of client. If the connection is not a socket, let 1253 * the address be 0.0.0.0. 1254 */ 1255 memset(&from, 0, sizeof(from)); 1256 fromlen = sizeof(from); 1257 if (packet_connection_is_on_socket()) { 1258 if (getpeername(packet_get_connection_in(), 1259 (struct sockaddr *) & from, &fromlen) < 0) { 1260 debug("getpeername: %.100s", strerror(errno)); 1261 cleanup_exit(255); 1262 } 1263 } 1264 /* Record that there was a login on that tty from the remote host. */ 1265 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, 1266 get_remote_name_or_ip(utmp_len, options.use_dns), 1267 (struct sockaddr *)&from, fromlen); 1268 } 1269 1270 static void 1271 mm_session_close(Session *s) 1272 { 1273 debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); 1274 if (s->ttyfd != -1) { 1275 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); 1276 session_pty_cleanup2(s); 1277 } 1278 s->used = 0; 1279 } 1280 1281 int 1282 mm_answer_pty(int sock, Buffer *m) 1283 { 1284 extern struct monitor *pmonitor; 1285 Session *s; 1286 int res, fd0; 1287 1288 debug3("%s entering", __func__); 1289 1290 buffer_clear(m); 1291 s = session_new(); 1292 if (s == NULL) 1293 goto error; 1294 s->authctxt = authctxt; 1295 s->pw = authctxt->pw; 1296 s->pid = pmonitor->m_pid; 1297 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); 1298 if (res == 0) 1299 goto error; 1300 pty_setowner(authctxt->pw, s->tty); 1301 1302 buffer_put_int(m, 1); 1303 buffer_put_cstring(m, s->tty); 1304 1305 /* We need to trick ttyslot */ 1306 if (dup2(s->ttyfd, 0) == -1) 1307 fatal("%s: dup2", __func__); 1308 1309 mm_record_login(s, authctxt->pw); 1310 1311 /* Now we can close the file descriptor again */ 1312 close(0); 1313 1314 /* send messages generated by record_login */ 1315 buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); 1316 buffer_clear(&loginmsg); 1317 1318 mm_request_send(sock, MONITOR_ANS_PTY, m); 1319 1320 mm_send_fd(sock, s->ptyfd); 1321 mm_send_fd(sock, s->ttyfd); 1322 1323 /* make sure nothing uses fd 0 */ 1324 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) 1325 fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); 1326 if (fd0 != 0) 1327 error("%s: fd0 %d != 0", __func__, fd0); 1328 1329 /* slave is not needed */ 1330 close(s->ttyfd); 1331 s->ttyfd = s->ptyfd; 1332 /* no need to dup() because nobody closes ptyfd */ 1333 s->ptymaster = s->ptyfd; 1334 1335 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); 1336 1337 return (0); 1338 1339 error: 1340 if (s != NULL) 1341 mm_session_close(s); 1342 buffer_put_int(m, 0); 1343 mm_request_send(sock, MONITOR_ANS_PTY, m); 1344 return (0); 1345 } 1346 1347 int 1348 mm_answer_pty_cleanup(int sock, Buffer *m) 1349 { 1350 Session *s; 1351 char *tty; 1352 1353 debug3("%s entering", __func__); 1354 1355 tty = buffer_get_string(m, NULL); 1356 if ((s = session_by_tty(tty)) != NULL) 1357 mm_session_close(s); 1358 buffer_clear(m); 1359 xfree(tty); 1360 return (0); 1361 } 1362 1363 int 1364 mm_answer_sesskey(int sock, Buffer *m) 1365 { 1366 BIGNUM *p; 1367 int rsafail; 1368 1369 /* Turn off permissions */ 1370 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); 1371 1372 if ((p = BN_new()) == NULL) 1373 fatal("%s: BN_new", __func__); 1374 1375 buffer_get_bignum2(m, p); 1376 1377 rsafail = ssh1_session_key(p); 1378 1379 buffer_clear(m); 1380 buffer_put_int(m, rsafail); 1381 buffer_put_bignum2(m, p); 1382 1383 BN_clear_free(p); 1384 1385 mm_request_send(sock, MONITOR_ANS_SESSKEY, m); 1386 1387 /* Turn on permissions for sessid passing */ 1388 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); 1389 1390 return (0); 1391 } 1392 1393 int 1394 mm_answer_sessid(int sock, Buffer *m) 1395 { 1396 int i; 1397 1398 debug3("%s entering", __func__); 1399 1400 if (buffer_len(m) != 16) 1401 fatal("%s: bad ssh1 session id", __func__); 1402 for (i = 0; i < 16; i++) 1403 session_id[i] = buffer_get_char(m); 1404 1405 /* Turn on permissions for getpwnam */ 1406 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 1407 1408 return (0); 1409 } 1410 1411 int 1412 mm_answer_rsa_keyallowed(int sock, Buffer *m) 1413 { 1414 BIGNUM *client_n; 1415 Key *key = NULL; 1416 u_char *blob = NULL; 1417 u_int blen = 0; 1418 int allowed = 0; 1419 1420 debug3("%s entering", __func__); 1421 1422 if (options.rsa_authentication && authctxt->valid) { 1423 if ((client_n = BN_new()) == NULL) 1424 fatal("%s: BN_new", __func__); 1425 buffer_get_bignum2(m, client_n); 1426 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); 1427 BN_clear_free(client_n); 1428 } 1429 buffer_clear(m); 1430 buffer_put_int(m, allowed); 1431 buffer_put_int(m, forced_command != NULL); 1432 1433 /* clear temporarily storage (used by generate challenge) */ 1434 monitor_reset_key_state(); 1435 1436 if (allowed && key != NULL) { 1437 key->type = KEY_RSA; /* cheat for key_to_blob */ 1438 if (key_to_blob(key, &blob, &blen) == 0) 1439 fatal("%s: key_to_blob failed", __func__); 1440 buffer_put_string(m, blob, blen); 1441 1442 /* Save temporarily for comparison in verify */ 1443 key_blob = blob; 1444 key_bloblen = blen; 1445 key_blobtype = MM_RSAUSERKEY; 1446 } 1447 if (key != NULL) 1448 key_free(key); 1449 1450 mm_append_debug(m); 1451 1452 mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); 1453 1454 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); 1455 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); 1456 return (0); 1457 } 1458 1459 int 1460 mm_answer_rsa_challenge(int sock, Buffer *m) 1461 { 1462 Key *key = NULL; 1463 u_char *blob; 1464 u_int blen; 1465 1466 debug3("%s entering", __func__); 1467 1468 if (!authctxt->valid) 1469 fatal("%s: authctxt not valid", __func__); 1470 blob = buffer_get_string(m, &blen); 1471 if (!monitor_allowed_key(blob, blen)) 1472 fatal("%s: bad key, not previously allowed", __func__); 1473 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1474 fatal("%s: key type mismatch", __func__); 1475 if ((key = key_from_blob(blob, blen)) == NULL) 1476 fatal("%s: received bad key", __func__); 1477 1478 if (ssh1_challenge) 1479 BN_clear_free(ssh1_challenge); 1480 ssh1_challenge = auth_rsa_generate_challenge(key); 1481 1482 buffer_clear(m); 1483 buffer_put_bignum2(m, ssh1_challenge); 1484 1485 debug3("%s sending reply", __func__); 1486 mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); 1487 1488 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); 1489 1490 xfree(blob); 1491 key_free(key); 1492 return (0); 1493 } 1494 1495 int 1496 mm_answer_rsa_response(int sock, Buffer *m) 1497 { 1498 Key *key = NULL; 1499 u_char *blob, *response; 1500 u_int blen, len; 1501 int success; 1502 1503 debug3("%s entering", __func__); 1504 1505 if (!authctxt->valid) 1506 fatal("%s: authctxt not valid", __func__); 1507 if (ssh1_challenge == NULL) 1508 fatal("%s: no ssh1_challenge", __func__); 1509 1510 blob = buffer_get_string(m, &blen); 1511 if (!monitor_allowed_key(blob, blen)) 1512 fatal("%s: bad key, not previously allowed", __func__); 1513 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) 1514 fatal("%s: key type mismatch: %d", __func__, key_blobtype); 1515 if ((key = key_from_blob(blob, blen)) == NULL) 1516 fatal("%s: received bad key", __func__); 1517 response = buffer_get_string(m, &len); 1518 if (len != 16) 1519 fatal("%s: received bad response to challenge", __func__); 1520 success = auth_rsa_verify_response(key, ssh1_challenge, response); 1521 1522 xfree(blob); 1523 key_free(key); 1524 xfree(response); 1525 1526 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; 1527 1528 /* reset state */ 1529 BN_clear_free(ssh1_challenge); 1530 ssh1_challenge = NULL; 1531 monitor_reset_key_state(); 1532 1533 buffer_clear(m); 1534 buffer_put_int(m, success); 1535 mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); 1536 1537 return (success); 1538 } 1539 1540 int 1541 mm_answer_term(int sock, Buffer *req) 1542 { 1543 extern struct monitor *pmonitor; 1544 int res, status; 1545 1546 debug3("%s: tearing down sessions", __func__); 1547 1548 /* The child is terminating */ 1549 session_destroy_all(&mm_session_close); 1550 1551 while (waitpid(pmonitor->m_pid, &status, 0) == -1) 1552 if (errno != EINTR) 1553 exit(1); 1554 1555 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; 1556 1557 /* Terminate process */ 1558 exit(res); 1559 } 1560 1561 #ifdef SSH_AUDIT_EVENTS 1562 /* Report that an audit event occurred */ 1563 int 1564 mm_answer_audit_event(int socket, Buffer *m) 1565 { 1566 ssh_audit_event_t event; 1567 1568 debug3("%s entering", __func__); 1569 1570 event = buffer_get_int(m); 1571 switch(event) { 1572 case SSH_AUTH_FAIL_PUBKEY: 1573 case SSH_AUTH_FAIL_HOSTBASED: 1574 case SSH_AUTH_FAIL_GSSAPI: 1575 case SSH_LOGIN_EXCEED_MAXTRIES: 1576 case SSH_LOGIN_ROOT_DENIED: 1577 case SSH_CONNECTION_CLOSE: 1578 case SSH_INVALID_USER: 1579 audit_event(event); 1580 break; 1581 default: 1582 fatal("Audit event type %d not permitted", event); 1583 } 1584 1585 return (0); 1586 } 1587 1588 int 1589 mm_answer_audit_command(int socket, Buffer *m) 1590 { 1591 u_int len; 1592 char *cmd; 1593 1594 debug3("%s entering", __func__); 1595 cmd = buffer_get_string(m, &len); 1596 /* sanity check command, if so how? */ 1597 audit_run_command(cmd); 1598 xfree(cmd); 1599 return (0); 1600 } 1601 #endif /* SSH_AUDIT_EVENTS */ 1602 1603 void 1604 monitor_apply_keystate(struct monitor *pmonitor) 1605 { 1606 if (compat20) { 1607 set_newkeys(MODE_IN); 1608 set_newkeys(MODE_OUT); 1609 } else { 1610 packet_set_protocol_flags(child_state.ssh1protoflags); 1611 packet_set_encryption_key(child_state.ssh1key, 1612 child_state.ssh1keylen, child_state.ssh1cipher); 1613 xfree(child_state.ssh1key); 1614 } 1615 1616 /* for rc4 and other stateful ciphers */ 1617 packet_set_keycontext(MODE_OUT, child_state.keyout); 1618 xfree(child_state.keyout); 1619 packet_set_keycontext(MODE_IN, child_state.keyin); 1620 xfree(child_state.keyin); 1621 1622 if (!compat20) { 1623 packet_set_iv(MODE_OUT, child_state.ivout); 1624 xfree(child_state.ivout); 1625 packet_set_iv(MODE_IN, child_state.ivin); 1626 xfree(child_state.ivin); 1627 } 1628 1629 memcpy(&incoming_stream, &child_state.incoming, 1630 sizeof(incoming_stream)); 1631 memcpy(&outgoing_stream, &child_state.outgoing, 1632 sizeof(outgoing_stream)); 1633 1634 /* Update with new address */ 1635 if (options.compression) 1636 mm_init_compression(pmonitor->m_zlib); 1637 1638 /* Network I/O buffers */ 1639 /* XXX inefficient for large buffers, need: buffer_init_from_string */ 1640 buffer_clear(&input); 1641 buffer_append(&input, child_state.input, child_state.ilen); 1642 memset(child_state.input, 0, child_state.ilen); 1643 xfree(child_state.input); 1644 1645 buffer_clear(&output); 1646 buffer_append(&output, child_state.output, child_state.olen); 1647 memset(child_state.output, 0, child_state.olen); 1648 xfree(child_state.output); 1649 } 1650 1651 static Kex * 1652 mm_get_kex(Buffer *m) 1653 { 1654 Kex *kex; 1655 void *blob; 1656 u_int bloblen; 1657 1658 kex = xmalloc(sizeof(*kex)); 1659 memset(kex, 0, sizeof(*kex)); 1660 kex->session_id = buffer_get_string(m, &kex->session_id_len); 1661 if ((session_id2 == NULL) || 1662 (kex->session_id_len != session_id2_len) || 1663 (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) 1664 fatal("mm_get_get: internal error: bad session id"); 1665 kex->we_need = buffer_get_int(m); 1666 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; 1667 kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; 1668 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; 1669 #ifdef GSSAPI 1670 kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server; 1671 #endif 1672 kex->server = 1; 1673 kex->hostkey_type = buffer_get_int(m); 1674 kex->kex_type = buffer_get_int(m); 1675 blob = buffer_get_string(m, &bloblen); 1676 buffer_init(&kex->my); 1677 buffer_append(&kex->my, blob, bloblen); 1678 xfree(blob); 1679 blob = buffer_get_string(m, &bloblen); 1680 buffer_init(&kex->peer); 1681 buffer_append(&kex->peer, blob, bloblen); 1682 xfree(blob); 1683 kex->done = 1; 1684 kex->flags = buffer_get_int(m); 1685 kex->client_version_string = buffer_get_string(m, NULL); 1686 kex->server_version_string = buffer_get_string(m, NULL); 1687 kex->load_host_key=&get_hostkey_by_type; 1688 kex->host_key_index=&get_hostkey_index; 1689 1690 return (kex); 1691 } 1692 1693 /* This function requries careful sanity checking */ 1694 1695 void 1696 mm_get_keystate(struct monitor *pmonitor) 1697 { 1698 Buffer m; 1699 u_char *blob, *p; 1700 u_int bloblen, plen; 1701 u_int32_t seqnr, packets; 1702 u_int64_t blocks; 1703 1704 debug3("%s: Waiting for new keys", __func__); 1705 1706 buffer_init(&m); 1707 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); 1708 if (!compat20) { 1709 child_state.ssh1protoflags = buffer_get_int(&m); 1710 child_state.ssh1cipher = buffer_get_int(&m); 1711 child_state.ssh1key = buffer_get_string(&m, 1712 &child_state.ssh1keylen); 1713 child_state.ivout = buffer_get_string(&m, 1714 &child_state.ivoutlen); 1715 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); 1716 goto skip; 1717 } else { 1718 /* Get the Kex for rekeying */ 1719 *pmonitor->m_pkex = mm_get_kex(&m); 1720 } 1721 1722 blob = buffer_get_string(&m, &bloblen); 1723 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); 1724 xfree(blob); 1725 1726 debug3("%s: Waiting for second key", __func__); 1727 blob = buffer_get_string(&m, &bloblen); 1728 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); 1729 xfree(blob); 1730 1731 /* Now get sequence numbers for the packets */ 1732 seqnr = buffer_get_int(&m); 1733 blocks = buffer_get_int64(&m); 1734 packets = buffer_get_int(&m); 1735 packet_set_state(MODE_OUT, seqnr, blocks, packets); 1736 seqnr = buffer_get_int(&m); 1737 blocks = buffer_get_int64(&m); 1738 packets = buffer_get_int(&m); 1739 packet_set_state(MODE_IN, seqnr, blocks, packets); 1740 1741 skip: 1742 /* Get the key context */ 1743 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); 1744 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); 1745 1746 debug3("%s: Getting compression state", __func__); 1747 /* Get compression state */ 1748 p = buffer_get_string(&m, &plen); 1749 if (plen != sizeof(child_state.outgoing)) 1750 fatal("%s: bad request size", __func__); 1751 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); 1752 xfree(p); 1753 1754 p = buffer_get_string(&m, &plen); 1755 if (plen != sizeof(child_state.incoming)) 1756 fatal("%s: bad request size", __func__); 1757 memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); 1758 xfree(p); 1759 1760 /* Network I/O buffers */ 1761 debug3("%s: Getting Network I/O buffers", __func__); 1762 child_state.input = buffer_get_string(&m, &child_state.ilen); 1763 child_state.output = buffer_get_string(&m, &child_state.olen); 1764 1765 buffer_free(&m); 1766 } 1767 1768 1769 /* Allocation functions for zlib */ 1770 void * 1771 mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) 1772 { 1773 size_t len = (size_t) size * ncount; 1774 void *address; 1775 1776 if (len == 0 || ncount > SIZE_T_MAX / size) 1777 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); 1778 1779 address = mm_malloc(mm, len); 1780 1781 return (address); 1782 } 1783 1784 void 1785 mm_zfree(struct mm_master *mm, void *address) 1786 { 1787 mm_free(mm, address); 1788 } 1789 1790 void 1791 mm_init_compression(struct mm_master *mm) 1792 { 1793 outgoing_stream.zalloc = (alloc_func)mm_zalloc; 1794 outgoing_stream.zfree = (free_func)mm_zfree; 1795 outgoing_stream.opaque = mm; 1796 1797 incoming_stream.zalloc = (alloc_func)mm_zalloc; 1798 incoming_stream.zfree = (free_func)mm_zfree; 1799 incoming_stream.opaque = mm; 1800 } 1801 1802 /* XXX */ 1803 1804 #define FD_CLOSEONEXEC(x) do { \ 1805 if (fcntl(x, F_SETFD, 1) == -1) \ 1806 fatal("fcntl(%d, F_SETFD)", x); \ 1807 } while (0) 1808 1809 static void 1810 monitor_socketpair(int *pair) 1811 { 1812 #ifdef HAVE_SOCKETPAIR 1813 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) 1814 fatal("%s: socketpair", __func__); 1815 #else 1816 fatal("%s: UsePrivilegeSeparation=yes not supported", 1817 __func__); 1818 #endif 1819 FD_CLOSEONEXEC(pair[0]); 1820 FD_CLOSEONEXEC(pair[1]); 1821 } 1822 1823 #define MM_MEMSIZE 65536 1824 1825 struct monitor * 1826 monitor_init(void) 1827 { 1828 struct monitor *mon; 1829 int pair[2]; 1830 1831 mon = xmalloc(sizeof(*mon)); 1832 1833 mon->m_pid = 0; 1834 monitor_socketpair(pair); 1835 1836 mon->m_recvfd = pair[0]; 1837 mon->m_sendfd = pair[1]; 1838 1839 /* Used to share zlib space across processes */ 1840 if (options.compression) { 1841 mon->m_zback = mm_create(NULL, MM_MEMSIZE); 1842 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); 1843 1844 /* Compression needs to share state across borders */ 1845 mm_init_compression(mon->m_zlib); 1846 } 1847 1848 return mon; 1849 } 1850 1851 void 1852 monitor_reinit(struct monitor *mon) 1853 { 1854 int pair[2]; 1855 1856 monitor_socketpair(pair); 1857 1858 mon->m_recvfd = pair[0]; 1859 mon->m_sendfd = pair[1]; 1860 } 1861 1862 #ifdef GSSAPI 1863 int 1864 mm_answer_gss_setup_ctx(int sock, Buffer *m) 1865 { 1866 gss_OID_desc goid; 1867 OM_uint32 major; 1868 u_int len; 1869 1870 goid.elements = buffer_get_string(m, &len); 1871 goid.length = len; 1872 1873 major = ssh_gssapi_server_ctx(&gsscontext, &goid); 1874 1875 xfree(goid.elements); 1876 1877 buffer_clear(m); 1878 buffer_put_int(m, major); 1879 1880 mm_request_send(sock,MONITOR_ANS_GSSSETUP, m); 1881 1882 /* Now we have a context, enable the step */ 1883 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); 1884 1885 return (0); 1886 } 1887 1888 int 1889 mm_answer_gss_accept_ctx(int sock, Buffer *m) 1890 { 1891 gss_buffer_desc in; 1892 gss_buffer_desc out = GSS_C_EMPTY_BUFFER; 1893 OM_uint32 major,minor; 1894 OM_uint32 flags = 0; /* GSI needs this */ 1895 u_int len; 1896 1897 in.value = buffer_get_string(m, &len); 1898 in.length = len; 1899 major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); 1900 xfree(in.value); 1901 1902 buffer_clear(m); 1903 buffer_put_int(m, major); 1904 buffer_put_string(m, out.value, out.length); 1905 buffer_put_int(m, flags); 1906 mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); 1907 1908 gss_release_buffer(&minor, &out); 1909 1910 if (major==GSS_S_COMPLETE) { 1911 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); 1912 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1913 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1); 1914 monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); 1915 } 1916 return (0); 1917 } 1918 1919 int 1920 mm_answer_gss_checkmic(int sock, Buffer *m) 1921 { 1922 gss_buffer_desc gssbuf, mic; 1923 OM_uint32 ret; 1924 u_int len; 1925 1926 gssbuf.value = buffer_get_string(m, &len); 1927 gssbuf.length = len; 1928 mic.value = buffer_get_string(m, &len); 1929 mic.length = len; 1930 1931 ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); 1932 1933 xfree(gssbuf.value); 1934 xfree(mic.value); 1935 1936 buffer_clear(m); 1937 buffer_put_int(m, ret); 1938 1939 mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); 1940 1941 if (!GSS_ERROR(ret)) 1942 monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); 1943 1944 return (0); 1945 } 1946 1947 int 1948 mm_answer_gss_userok(int sock, Buffer *m) 1949 { 1950 int authenticated; 1951 1952 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); 1953 1954 buffer_clear(m); 1955 buffer_put_int(m, authenticated); 1956 1957 debug3("%s: sending result %d", __func__, authenticated); 1958 mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); 1959 1960 auth_method="gssapi-with-mic"; 1961 1962 /* Monitor loop will terminate if authenticated */ 1963 return (authenticated); 1964 } 1965 1966 int 1967 mm_answer_gss_sign(int socket, Buffer *m) { 1968 gss_buffer_desc data,hash; 1969 OM_uint32 major,minor; 1970 u_int len; 1971 1972 data.value = buffer_get_string(m, &len); 1973 data.length = len; 1974 if (data.length != 20) 1975 fatal("%s: data length incorrect: %d", __func__, 1976 (int)data.length); 1977 1978 /* Save the session ID - only first time round */ 1979 if (session_id2_len == 0) { 1980 session_id2_len=data.length; 1981 session_id2 = xmalloc(session_id2_len); 1982 memcpy(session_id2, data.value, session_id2_len); 1983 } 1984 major=ssh_gssapi_sign(gsscontext, &data, &hash); 1985 1986 xfree(data.value); 1987 1988 buffer_clear(m); 1989 buffer_put_int(m, major); 1990 buffer_put_string(m, hash.value, hash.length); 1991 1992 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m); 1993 1994 gss_release_buffer(&minor,&hash); 1995 1996 /* Turn on permissions for getpwnam */ 1997 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); 1998 1999 return(0); 2000 } 2001 2002 int 2003 mm_answer_gss_error(int socket, Buffer *m) { 2004 OM_uint32 major,minor; 2005 char *msg; 2006 2007 msg=ssh_gssapi_last_error(gsscontext,&major,&minor); 2008 buffer_clear(m); 2009 buffer_put_int(m,major); 2010 buffer_put_int(m,minor); 2011 buffer_put_cstring(m,msg); 2012 2013 mm_request_send(socket,MONITOR_ANS_GSSERR,m); 2014 2015 xfree(msg); 2016 2017 return(0); 2018 } 2019 2020 int 2021 mm_answer_gss_indicate_mechs(int socket, Buffer *m) { 2022 OM_uint32 major,minor; 2023 gss_OID_set mech_set; 2024 int i; 2025 2026 major=gss_indicate_mechs(&minor, &mech_set); 2027 2028 buffer_clear(m); 2029 buffer_put_int(m, major); 2030 buffer_put_int(m, mech_set->count); 2031 for (i=0; i < mech_set->count; i++) { 2032 buffer_put_string(m, mech_set->elements[i].elements, 2033 mech_set->elements[i].length); 2034 } 2035 2036 #if !defined(MECHGLUE) /* mechglue memory management bug ??? */ 2037 gss_release_oid_set(&minor,&mech_set); 2038 #endif 2039 2040 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m); 2041 2042 return(0); 2043 } 2044 2045 int 2046 mm_answer_gss_localname(int socket, Buffer *m) { 2047 char *name; 2048 2049 ssh_gssapi_localname(&name); 2050 2051 buffer_clear(m); 2052 if (name) { 2053 buffer_put_cstring(m, name); 2054 debug3("%s: sending result %s", __func__, name); 2055 xfree(name); 2056 } else { 2057 buffer_put_cstring(m, ""); 2058 debug3("%s: sending result \"\"", __func__); 2059 } 2060 2061 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m); 2062 2063 return(0); 2064 } 2065 #endif /* GSSAPI */ git-cvsimport mirror of GSI OpenSSH RSS Atom This page took 0.061268 seconds and 5 git commands to generate.
