1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (C) 1990 by the Massachusetts Institute of Technology 36 * 37 * Export of this software from the United States of America may 38 * require a specific license from the United States Government. 39 * It is the responsibility of any person or organization contemplating 40 * export to obtain such a license before exporting. 41 * 42 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 43 * distribute this software and its documentation for any purpose and 44 * without fee is hereby granted, provided that the above copyright 45 * notice appear in all copies and that both that copyright notice and 46 * this permission notice appear in supporting documentation, and that 47 * the name of M.I.T. not be used in advertising or publicity pertaining 48 * to distribution of the software without specific, written prior 49 * permission. M.I.T. makes no representations about the suitability of 50 * this software for any purpose. It is provided "as is" without express 51 * or implied warranty. 52 */ 53 54 #include <config.h> 55 56 RCSID("$Id: kerberos5.c,v 1.51 2002/09/02 15:33:20 joda Exp $"); 57 58 #ifdef KRB5 59 60 #include <arpa/telnet.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 #include <netdb.h> 66 #include <ctype.h> 67 #include <pwd.h> 68 #define Authenticator k5_Authenticator 69 #include <krb5.h> 70 #undef Authenticator 71 #include <roken.h> 72 #ifdef SOCKS 73 #include <socks.h> 74 #endif 75 76 77 #include "encrypt.h" 78 #include "auth.h" 79 #include "misc.h" 80 81 #if defined(DCE) 82 int dfsk5ok = 0; 83 int dfspag = 0; 84 int dfsfwd = 0; 85 #endif 86 87 int forward_flags = 0; /* Flags get set in telnet/main.c on -f and -F */ 88 89 int forward(int); 90 int forwardable(int); 91 92 /* These values need to be the same as those defined in telnet/main.c. */ 93 /* Either define them in both places, or put in some common header file. */ 94 #define OPTS_FORWARD_CREDS 0x00000002 95 #define OPTS_FORWARDABLE_CREDS 0x00000001 96 97 98 void kerberos5_forward (Authenticator *); 99 100 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0, 101 AUTHTYPE_KERBEROS_V5, }; 102 103 #define KRB_AUTH 0 /* Authentication data follows */ 104 #define KRB_REJECT 1 /* Rejected (reason might follow) */ 105 #define KRB_ACCEPT 2 /* Accepted */ 106 #define KRB_RESPONSE 3 /* Response for mutual auth. */ 107 108 #define KRB_FORWARD 4 /* Forwarded credentials follow */ 109 #define KRB_FORWARD_ACCEPT 5 /* Forwarded credentials accepted */ 110 #define KRB_FORWARD_REJECT 6 /* Forwarded credentials rejected */ 111 112 static krb5_data auth; 113 static krb5_ticket *ticket; 114 115 static krb5_context context; 116 static krb5_auth_context auth_context; 117 118 static int 119 Data(Authenticator *ap, int type, void *d, int c) 120 { 121 unsigned char *p = str_data + 4; 122 unsigned char *cd = (unsigned char *)d; 123 124 if (c == -1) 125 c = strlen((char*)cd); 126 127 if (auth_debug_mode) { 128 printf("%s:%d: [%d] (%d)", 129 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY", 130 str_data[3], 131 type, c); 132 printd(d, c); 133 printf("\r\n"); 134 } 135 *p++ = ap->type; 136 *p++ = ap->way; 137 *p++ = type; 138 while (c-- > 0) { 139 if ((*p++ = *cd++) == IAC) 140 *p++ = IAC; 141 } 142 *p++ = IAC; 143 *p++ = SE; 144 if (str_data[3] == TELQUAL_IS) 145 printsub('>', &str_data[2], p - &str_data[2]); 146 return(telnet_net_write(str_data, p - str_data)); 147 } 148 149 int 150 kerberos5_init(Authenticator *ap, int server) 151 { 152 krb5_error_code ret; 153 154 ret = krb5_init_context(&context); 155 if (ret) 156 return 0; 157 if (server) { 158 krb5_keytab kt; 159 krb5_kt_cursor cursor; 160 161 ret = krb5_kt_default(context, &kt); 162 if (ret) 163 return 0; 164 165 ret = krb5_kt_start_seq_get (context, kt, &cursor); 166 if (ret) { 167 krb5_kt_close (context, kt); 168 return 0; 169 } 170 krb5_kt_end_seq_get (context, kt, &cursor); 171 krb5_kt_close (context, kt); 172 173 str_data[3] = TELQUAL_REPLY; 174 } else 175 str_data[3] = TELQUAL_IS; 176 return(1); 177 } 178 179 extern int net; 180 static int 181 kerberos5_send(char *name, Authenticator *ap) 182 { 183 krb5_error_code ret; 184 krb5_ccache ccache; 185 int ap_opts; 186 krb5_data cksum_data; 187 char foo[2]; 188 189 if (!UserNameRequested) { 190 if (auth_debug_mode) { 191 printf("Kerberos V5: no user name supplied\r\n"); 192 } 193 return(0); 194 } 195 196 ret = krb5_cc_default(context, &ccache); 197 if (ret) { 198 if (auth_debug_mode) { 199 printf("Kerberos V5: could not get default ccache: %s\r\n", 200 krb5_get_err_text (context, ret)); 201 } 202 return 0; 203 } 204 205 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) 206 ap_opts = AP_OPTS_MUTUAL_REQUIRED; 207 else 208 ap_opts = 0; 209 210 ap_opts |= AP_OPTS_USE_SUBKEY; 211 212 ret = krb5_auth_con_init (context, &auth_context); 213 if (ret) { 214 if (auth_debug_mode) { 215 printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n", 216 krb5_get_err_text(context, ret)); 217 } 218 return(0); 219 } 220 221 ret = krb5_auth_con_setaddrs_from_fd (context, 222 auth_context, 223 &net); 224 if (ret) { 225 if (auth_debug_mode) { 226 printf ("Kerberos V5:" 227 " krb5_auth_con_setaddrs_from_fd failed (%s)\r\n", 228 krb5_get_err_text(context, ret)); 229 } 230 return(0); 231 } 232 233 krb5_auth_con_setkeytype (context, auth_context, KEYTYPE_DES); 234 235 foo[0] = ap->type; 236 foo[1] = ap->way; 237 238 cksum_data.length = sizeof(foo); 239 cksum_data.data = foo; 240 241 242 { 243 krb5_principal service; 244 char sname[128]; 245 246 247 ret = krb5_sname_to_principal (context, 248 RemoteHostName, 249 NULL, 250 KRB5_NT_SRV_HST, 251 &service); 252 if(ret) { 253 if (auth_debug_mode) { 254 printf ("Kerberos V5:" 255 " krb5_sname_to_principal(%s) failed (%s)\r\n", 256 RemoteHostName, krb5_get_err_text(context, ret)); 257 } 258 return 0; 259 } 260 ret = krb5_unparse_name_fixed(context, service, sname, sizeof(sname)); 261 if(ret) { 262 if (auth_debug_mode) { 263 printf ("Kerberos V5:" 264 " krb5_unparse_name_fixed failed (%s)\r\n", 265 krb5_get_err_text(context, ret)); 266 } 267 return 0; 268 } 269 printf("[ Trying %s (%s)... ]\r\n", name, sname); 270 ret = krb5_mk_req_exact(context, &auth_context, ap_opts, 271 service, 272 &cksum_data, ccache, &auth); 273 krb5_free_principal (context, service); 274 275 } 276 if (ret) { 277 if (1 || auth_debug_mode) { 278 printf("Kerberos V5: mk_req failed (%s)\r\n", 279 krb5_get_err_text(context, ret)); 280 } 281 return(0); 282 } 283 284 if (!auth_sendname((unsigned char *)UserNameRequested, 285 strlen(UserNameRequested))) { 286 if (auth_debug_mode) 287 printf("Not enough room for user name\r\n"); 288 return(0); 289 } 290 if (!Data(ap, KRB_AUTH, auth.data, auth.length)) { 291 if (auth_debug_mode) 292 printf("Not enough room for authentication data\r\n"); 293 return(0); 294 } 295 if (auth_debug_mode) { 296 printf("Sent Kerberos V5 credentials to server\r\n"); 297 } 298 return(1); 299 } 300 301 int 302 kerberos5_send_mutual(Authenticator *ap) 303 { 304 return kerberos5_send("mutual KERBEROS5", ap); 305 } 306 307 int 308 kerberos5_send_oneway(Authenticator *ap) 309 { 310 return kerberos5_send("KERBEROS5", ap); 311 } 312 313 void 314 kerberos5_is(Authenticator *ap, unsigned char *data, int cnt) 315 { 316 krb5_error_code ret; 317 krb5_data outbuf; 318 krb5_keyblock *key_block; 319 char *name; 320 krb5_principal server; 321 int zero = 0; 322 323 if (cnt-- < 1) 324 return; 325 switch (*data++) { 326 case KRB_AUTH: 327 auth.data = (char *)data; 328 auth.length = cnt; 329 330 auth_context = NULL; 331 332 ret = krb5_auth_con_init (context, &auth_context); 333 if (ret) { 334 Data(ap, KRB_REJECT, "krb5_auth_con_init failed", -1); 335 auth_finished(ap, AUTH_REJECT); 336 if (auth_debug_mode) 337 printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n", 338 krb5_get_err_text(context, ret)); 339 return; 340 } 341 342 ret = krb5_auth_con_setaddrs_from_fd (context, 343 auth_context, 344 &zero); 345 if (ret) { 346 Data(ap, KRB_REJECT, "krb5_auth_con_setaddrs_from_fd failed", -1); 347 auth_finished(ap, AUTH_REJECT); 348 if (auth_debug_mode) 349 printf("Kerberos V5: " 350 "krb5_auth_con_setaddrs_from_fd failed (%s)\r\n", 351 krb5_get_err_text(context, ret)); 352 return; 353 } 354 355 ret = krb5_sock_to_principal (context, 356 0, 357 "host", 358 KRB5_NT_SRV_HST, 359 &server); 360 if (ret) { 361 Data(ap, KRB_REJECT, "krb5_sock_to_principal failed", -1); 362 auth_finished(ap, AUTH_REJECT); 363 if (auth_debug_mode) 364 printf("Kerberos V5: " 365 "krb5_sock_to_principal failed (%s)\r\n", 366 krb5_get_err_text(context, ret)); 367 return; 368 } 369 370 ret = krb5_rd_req(context, 371 &auth_context, 372 &auth, 373 server, 374 NULL, 375 NULL, 376 &ticket); 377 378 krb5_free_principal (context, server); 379 if (ret) { 380 char *errbuf; 381 382 asprintf(&errbuf, 383 "Read req failed: %s", 384 krb5_get_err_text(context, ret)); 385 Data(ap, KRB_REJECT, errbuf, -1); 386 if (auth_debug_mode) 387 printf("%s\r\n", errbuf); 388 free (errbuf); 389 return; 390 } 391 392 { 393 char foo[2]; 394 395 foo[0] = ap->type; 396 foo[1] = ap->way; 397 398 ret = krb5_verify_authenticator_checksum(context, 399 auth_context, 400 foo, 401 sizeof(foo)); 402 403 if (ret) { 404 char *errbuf; 405 asprintf(&errbuf, "Bad checksum: %s", 406 krb5_get_err_text(context, ret)); 407 Data(ap, KRB_REJECT, errbuf, -1); 408 if (auth_debug_mode) 409 printf ("%s\r\n", errbuf); 410 free(errbuf); 411 return; 412 } 413 } 414 ret = krb5_auth_con_getremotesubkey (context, 415 auth_context, 416 &key_block); 417 418 if (ret) { 419 Data(ap, KRB_REJECT, "krb5_auth_con_getremotesubkey failed", -1); 420 auth_finished(ap, AUTH_REJECT); 421 if (auth_debug_mode) 422 printf("Kerberos V5: " 423 "krb5_auth_con_getremotesubkey failed (%s)\r\n", 424 krb5_get_err_text(context, ret)); 425 return; 426 } 427 428 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) { 429 ret = krb5_mk_rep(context, auth_context, &outbuf); 430 if (ret) { 431 Data(ap, KRB_REJECT, 432 "krb5_mk_rep failed", -1); 433 auth_finished(ap, AUTH_REJECT); 434 if (auth_debug_mode) 435 printf("Kerberos V5: " 436 "krb5_mk_rep failed (%s)\r\n", 437 krb5_get_err_text(context, ret)); 438 return; 439 } 440 Data(ap, KRB_RESPONSE, outbuf.data, outbuf.length); 441 } 442 if (krb5_unparse_name(context, ticket->client, &name)) 443 name = 0; 444 445 if(UserNameRequested && krb5_kuserok(context, 446 ticket->client, 447 UserNameRequested)) { 448 Data(ap, KRB_ACCEPT, name, name ? -1 : 0); 449 if (auth_debug_mode) { 450 printf("Kerberos5 identifies him as ``%s''\r\n", 451 name ? name : ""); 452 } 453 454 if(key_block->keytype == ETYPE_DES_CBC_MD5 || 455 key_block->keytype == ETYPE_DES_CBC_MD4 || 456 key_block->keytype == ETYPE_DES_CBC_CRC) { 457 Session_Key skey; 458 459 skey.type = SK_DES; 460 skey.length = 8; 461 skey.data = key_block->keyvalue.data; 462 encrypt_session_key(&skey, 0); 463 } 464 465 } else { 466 char *msg; 467 468 asprintf (&msg, "user `%s' is not authorized to " 469 "login as `%s'", 470 name ? name : "<unknown>", 471 UserNameRequested ? UserNameRequested : "<nobody>"); 472 if (msg == NULL) 473 Data(ap, KRB_REJECT, NULL, 0); 474 else { 475 Data(ap, KRB_REJECT, (void *)msg, -1); 476 free(msg); 477 } 478 auth_finished (ap, AUTH_REJECT); 479 krb5_free_keyblock_contents(context, key_block); 480 break; 481 } 482 auth_finished(ap, AUTH_USER); 483 krb5_free_keyblock_contents(context, key_block); 484 485 break; 486 case KRB_FORWARD: { 487 struct passwd *pwd; 488 char ccname[1024]; /* XXX */ 489 krb5_data inbuf; 490 krb5_ccache ccache; 491 inbuf.data = (char *)data; 492 inbuf.length = cnt; 493 494 pwd = getpwnam (UserNameRequested); 495 if (pwd == NULL) 496 break; 497 498 snprintf (ccname, sizeof(ccname), 499 "FILE:/tmp/krb5cc_%u", pwd->pw_uid); 500 501 ret = krb5_cc_resolve (context, ccname, &ccache); 502 if (ret) { 503 if (auth_debug_mode) 504 printf ("Kerberos V5: could not get ccache: %s\r\n", 505 krb5_get_err_text(context, ret)); 506 break; 507 } 508 509 ret = krb5_cc_initialize (context, 510 ccache, 511 ticket->client); 512 if (ret) { 513 if (auth_debug_mode) 514 printf ("Kerberos V5: could not init ccache: %s\r\n", 515 krb5_get_err_text(context, ret)); 516 break; 517 } 518 519 #if defined(DCE) 520 esetenv("KRB5CCNAME", ccname, 1); 521 #endif 522 ret = krb5_rd_cred2 (context, 523 auth_context, 524 ccache, 525 &inbuf); 526 if(ret) { 527 char *errbuf; 528 529 asprintf (&errbuf, 530 "Read forwarded creds failed: %s", 531 krb5_get_err_text (context, ret)); 532 if(errbuf == NULL) 533 Data(ap, KRB_FORWARD_REJECT, NULL, 0); 534 else 535 Data(ap, KRB_FORWARD_REJECT, errbuf, -1); 536 if (auth_debug_mode) 537 printf("Could not read forwarded credentials: %s\r\n", 538 errbuf); 539 free (errbuf); 540 } else { 541 Data(ap, KRB_FORWARD_ACCEPT, 0, 0); 542 #if defined(DCE) 543 dfsfwd = 1; 544 #endif 545 } 546 chown (ccname + 5, pwd->pw_uid, -1); 547 if (auth_debug_mode) 548 printf("Forwarded credentials obtained\r\n"); 549 break; 550 } 551 default: 552 if (auth_debug_mode) 553 printf("Unknown Kerberos option %d\r\n", data[-1]); 554 Data(ap, KRB_REJECT, 0, 0); 555 break; 556 } 557 } 558 559 void 560 kerberos5_reply(Authenticator *ap, unsigned char *data, int cnt) 561 { 562 static int mutual_complete = 0; 563 564 if (cnt-- < 1) 565 return; 566 switch (*data++) { 567 case KRB_REJECT: 568 if (cnt > 0) { 569 printf("[ Kerberos V5 refuses authentication because %.*s ]\r\n", 570 cnt, data); 571 } else 572 printf("[ Kerberos V5 refuses authentication ]\r\n"); 573 auth_send_retry(); 574 return; 575 case KRB_ACCEPT: { 576 krb5_error_code ret; 577 Session_Key skey; 578 krb5_keyblock *keyblock; 579 580 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL && 581 !mutual_complete) { 582 printf("[ Kerberos V5 accepted you, but didn't provide mutual authentication! ]\r\n"); 583 auth_send_retry(); 584 return; 585 } 586 if (cnt) 587 printf("[ Kerberos V5 accepts you as ``%.*s'' ]\r\n", cnt, data); 588 else 589 printf("[ Kerberos V5 accepts you ]\r\n"); 590 591 ret = krb5_auth_con_getlocalsubkey (context, 592 auth_context, 593 &keyblock); 594 if (ret) 595 ret = krb5_auth_con_getkey (context, 596 auth_context, 597 &keyblock); 598 if(ret) { 599 printf("[ krb5_auth_con_getkey: %s ]\r\n", 600 krb5_get_err_text(context, ret)); 601 auth_send_retry(); 602 return; 603 } 604 605 skey.type = SK_DES; 606 skey.length = 8; 607 skey.data = keyblock->keyvalue.data; 608 encrypt_session_key(&skey, 0); 609 krb5_free_keyblock_contents (context, keyblock); 610 auth_finished(ap, AUTH_USER); 611 if (forward_flags & OPTS_FORWARD_CREDS) 612 kerberos5_forward(ap); 613 break; 614 } 615 case KRB_RESPONSE: 616 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) { 617 /* the rest of the reply should contain a krb_ap_rep */ 618 krb5_ap_rep_enc_part *reply; 619 krb5_data inbuf; 620 krb5_error_code ret; 621 622 inbuf.length = cnt; 623 inbuf.data = (char *)data; 624 625 ret = krb5_rd_rep(context, auth_context, &inbuf, &reply); 626 if (ret) { 627 printf("[ Mutual authentication failed: %s ]\r\n", 628 krb5_get_err_text (context, ret)); 629 auth_send_retry(); 630 return; 631 } 632 krb5_free_ap_rep_enc_part(context, reply); 633 mutual_complete = 1; 634 } 635 return; 636 case KRB_FORWARD_ACCEPT: 637 printf("[ Kerberos V5 accepted forwarded credentials ]\r\n"); 638 return; 639 case KRB_FORWARD_REJECT: 640 printf("[ Kerberos V5 refuses forwarded credentials because %.*s ]\r\n", 641 cnt, data); 642 return; 643 default: 644 if (auth_debug_mode) 645 printf("Unknown Kerberos option %d\r\n", data[-1]); 646 return; 647 } 648 } 649 650 int 651 kerberos5_status(Authenticator *ap, char *name, size_t name_sz, int level) 652 { 653 if (level < AUTH_USER) 654 return(level); 655 656 if (UserNameRequested && 657 krb5_kuserok(context, 658 ticket->client, 659 UserNameRequested)) 660 { 661 strlcpy(name, UserNameRequested, name_sz); 662 #if defined(DCE) 663 dfsk5ok = 1; 664 #endif 665 return(AUTH_VALID); 666 } else 667 return(AUTH_USER); 668 } 669 670 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);} 671 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);} 672 673 void 674 kerberos5_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen) 675 { 676 int i; 677 678 buf[buflen-1] = '\0'; /* make sure its NULL terminated */ 679 buflen -= 1; 680 681 switch(data[3]) { 682 case KRB_REJECT: /* Rejected (reason might follow) */ 683 strlcpy((char *)buf, " REJECT ", buflen); 684 goto common; 685 686 case KRB_ACCEPT: /* Accepted (name might follow) */ 687 strlcpy((char *)buf, " ACCEPT ", buflen); 688 common: 689 BUMP(buf, buflen); 690 if (cnt <= 4) 691 break; 692 ADDC(buf, buflen, '"'); 693 for (i = 4; i < cnt; i++) 694 ADDC(buf, buflen, data[i]); 695 ADDC(buf, buflen, '"'); 696 ADDC(buf, buflen, '\0'); 697 break; 698 699 700 case KRB_AUTH: /* Authentication data follows */ 701 strlcpy((char *)buf, " AUTH", buflen); 702 goto common2; 703 704 case KRB_RESPONSE: 705 strlcpy((char *)buf, " RESPONSE", buflen); 706 goto common2; 707 708 case KRB_FORWARD: /* Forwarded credentials follow */ 709 strlcpy((char *)buf, " FORWARD", buflen); 710 goto common2; 711 712 case KRB_FORWARD_ACCEPT: /* Forwarded credentials accepted */ 713 strlcpy((char *)buf, " FORWARD_ACCEPT", buflen); 714 goto common2; 715 716 case KRB_FORWARD_REJECT: /* Forwarded credentials rejected */ 717 /* (reason might follow) */ 718 strlcpy((char *)buf, " FORWARD_REJECT", buflen); 719 goto common2; 720 721 default: 722 snprintf((char*)buf, buflen, " %d (unknown)", data[3]); 723 common2: 724 BUMP(buf, buflen); 725 for (i = 4; i < cnt; i++) { 726 snprintf((char*)buf, buflen, " %d", data[i]); 727 BUMP(buf, buflen); 728 } 729 break; 730 } 731 } 732 733 void 734 kerberos5_forward(Authenticator *ap) 735 { 736 krb5_error_code ret; 737 krb5_ccache ccache; 738 krb5_creds creds; 739 krb5_kdc_flags flags; 740 krb5_data out_data; 741 krb5_principal principal; 742 743 ret = krb5_cc_default (context, &ccache); 744 if (ret) { 745 if (auth_debug_mode) 746 printf ("KerberosV5: could not get default ccache: %s\r\n", 747 krb5_get_err_text (context, ret)); 748 return; 749 } 750 751 ret = krb5_cc_get_principal (context, ccache, &principal); 752 if (ret) { 753 if (auth_debug_mode) 754 printf ("KerberosV5: could not get principal: %s\r\n", 755 krb5_get_err_text (context, ret)); 756 return; 757 } 758 759 memset (&creds, 0, sizeof(creds)); 760 761 creds.client = principal; 762 763 ret = krb5_build_principal (context, 764 &creds.server, 765 strlen(principal->realm), 766 principal->realm, 767 "krbtgt", 768 principal->realm, 769 NULL); 770 771 if (ret) { 772 if (auth_debug_mode) 773 printf ("KerberosV5: could not get principal: %s\r\n", 774 krb5_get_err_text (context, ret)); 775 return; 776 } 777 778 creds.times.endtime = 0; 779 780 flags.i = 0; 781 flags.b.forwarded = 1; 782 if (forward_flags & OPTS_FORWARDABLE_CREDS) 783 flags.b.forwardable = 1; 784 785 ret = krb5_get_forwarded_creds (context, 786 auth_context, 787 ccache, 788 flags.i, 789 RemoteHostName, 790 &creds, 791 &out_data); 792 if (ret) { 793 if (auth_debug_mode) 794 printf ("Kerberos V5: error getting forwarded creds: %s\r\n", 795 krb5_get_err_text (context, ret)); 796 return; 797 } 798 799 if(!Data(ap, KRB_FORWARD, out_data.data, out_data.length)) { 800 if (auth_debug_mode) 801 printf("Not enough room for authentication data\r\n"); 802 } else { 803 if (auth_debug_mode) 804 printf("Forwarded local Kerberos V5 credentials to server\r\n"); 805 } 806 } 807 808 #if defined(DCE) 809 /* if this was a K5 authentication try and join a PAG for the user. */ 810 void 811 kerberos5_dfspag(void) 812 { 813 if (dfsk5ok) { 814 dfspag = krb5_dfs_pag(context, dfsfwd, ticket->client, 815 UserNameRequested); 816 } 817 } 818 #endif 819 820 int 821 kerberos5_set_forward(int on) 822 { 823 if(on == 0) 824 forward_flags &= ~OPTS_FORWARD_CREDS; 825 if(on == 1) 826 forward_flags |= OPTS_FORWARD_CREDS; 827 if(on == -1) 828 forward_flags ^= OPTS_FORWARD_CREDS; 829 return 0; 830 } 831 832 int 833 kerberos5_set_forwardable(int on) 834 { 835 if(on == 0) 836 forward_flags &= ~OPTS_FORWARDABLE_CREDS; 837 if(on == 1) 838 forward_flags |= OPTS_FORWARDABLE_CREDS; 839 if(on == -1) 840 forward_flags ^= OPTS_FORWARDABLE_CREDS; 841 return 0; 842 } 843 844 #endif /* KRB5 */ 845