1/* 2 Unix SMB/CIFS implementation. 3 simple kerberos5 routines for active directory 4 Copyright (C) Andrew Tridgell 2001 5 Copyright (C) Luke Howard 2002-2003 6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005 7 Copyright (C) Guenther Deschner 2005-2009 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program. If not, see <http://www.gnu.org/licenses/>. 21*/ 22 23#include "includes.h" 24#include "smb_krb5.h" 25#include "authdata.h" 26 27#ifdef HAVE_KRB5 28 29#define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */ 30#define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */ 31#define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length, 32 bind field, flags field. */ 33 34/* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype, 35 but still has the symbol */ 36#if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE 37krb5_error_code krb5_auth_con_set_req_cksumtype( 38 krb5_context context, 39 krb5_auth_context auth_context, 40 krb5_cksumtype cksumtype); 41#endif 42 43/************************************************************** 44 Wrappers around kerberos string functions that convert from 45 utf8 -> unix charset and vica versa. 46**************************************************************/ 47 48/************************************************************** 49 krb5_parse_name that takes a UNIX charset. 50**************************************************************/ 51 52 krb5_error_code smb_krb5_parse_name(krb5_context context, 53 const char *name, /* in unix charset */ 54 krb5_principal *principal) 55{ 56 krb5_error_code ret; 57 char *utf8_name; 58 size_t converted_size; 59 60 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) { 61 return ENOMEM; 62 } 63 64 ret = krb5_parse_name(context, utf8_name, principal); 65 TALLOC_FREE(utf8_name); 66 return ret; 67} 68 69#ifdef HAVE_KRB5_PARSE_NAME_NOREALM 70/************************************************************** 71 krb5_parse_name_norealm that takes a UNIX charset. 72**************************************************************/ 73 74static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context, 75 const char *name, /* in unix charset */ 76 krb5_principal *principal) 77{ 78 krb5_error_code ret; 79 char *utf8_name; 80 size_t converted_size; 81 82 *principal = NULL; 83 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) { 84 return ENOMEM; 85 } 86 87 ret = krb5_parse_name_norealm(context, utf8_name, principal); 88 TALLOC_FREE(utf8_name); 89 return ret; 90} 91#endif 92 93/************************************************************** 94 krb5_parse_name that returns a UNIX charset name. Must 95 be freed with talloc_free() call. 96**************************************************************/ 97 98krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx, 99 krb5_context context, 100 krb5_const_principal principal, 101 char **unix_name) 102{ 103 krb5_error_code ret; 104 char *utf8_name; 105 size_t converted_size; 106 107 *unix_name = NULL; 108 ret = krb5_unparse_name(context, principal, &utf8_name); 109 if (ret) { 110 return ret; 111 } 112 113 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) { 114 krb5_free_unparsed_name(context, utf8_name); 115 return ENOMEM; 116 } 117 krb5_free_unparsed_name(context, utf8_name); 118 return 0; 119} 120 121#ifndef HAVE_KRB5_SET_REAL_TIME 122/* 123 * This function is not in the Heimdal mainline. 124 */ 125 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds) 126{ 127 krb5_error_code ret; 128 int32_t sec, usec; 129 130 ret = krb5_us_timeofday(context, &sec, &usec); 131 if (ret) 132 return ret; 133 134 context->kdc_sec_offset = seconds - sec; 135 context->kdc_usec_offset = microseconds - usec; 136 137 return 0; 138} 139#endif 140 141#if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES) 142 143#if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES) 144 145/* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference 146 * to krb5_set_default_tgs_ktypes. See 147 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html 148 * 149 * If the MIT libraries are not exporting internal symbols, we will end up in 150 * this branch, which is correct. Otherwise we will continue to use the 151 * internal symbol 152 */ 153 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc) 154{ 155 return krb5_set_default_tgs_enctypes(ctx, enc); 156} 157 158#elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES) 159 160/* Heimdal */ 161 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc) 162{ 163 return krb5_set_default_in_tkt_etypes(ctx, enc); 164} 165 166#endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */ 167 168#endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */ 169 170#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) 171/* HEIMDAL */ 172 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr) 173{ 174 memset(pkaddr, '\0', sizeof(krb5_address)); 175#if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6) 176 if (paddr->ss_family == AF_INET6) { 177 pkaddr->addr_type = KRB5_ADDRESS_INET6; 178 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr); 179 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr); 180 return true; 181 } 182#endif 183 if (paddr->ss_family == AF_INET) { 184 pkaddr->addr_type = KRB5_ADDRESS_INET; 185 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr); 186 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr); 187 return true; 188 } 189 return false; 190} 191#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) 192/* MIT */ 193 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr) 194{ 195 memset(pkaddr, '\0', sizeof(krb5_address)); 196#if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6) 197 if (paddr->ss_family == AF_INET6) { 198 pkaddr->addrtype = ADDRTYPE_INET6; 199 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr); 200 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr); 201 return true; 202 } 203#endif 204 if (paddr->ss_family == AF_INET) { 205 pkaddr->addrtype = ADDRTYPE_INET; 206 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr); 207 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr); 208 return true; 209 } 210 return false; 211} 212#else 213#error UNKNOWN_ADDRTYPE 214#endif 215 216#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK) 217static int create_kerberos_key_from_string_direct(krb5_context context, 218 krb5_principal host_princ, 219 krb5_data *password, 220 krb5_keyblock *key, 221 krb5_enctype enctype) 222{ 223 int ret = 0; 224 krb5_data salt; 225 krb5_encrypt_block eblock; 226 227 ret = krb5_principal2salt(context, host_princ, &salt); 228 if (ret) { 229 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret))); 230 return ret; 231 } 232 krb5_use_enctype(context, &eblock, enctype); 233 ret = krb5_string_to_key(context, &eblock, key, password, &salt); 234 SAFE_FREE(salt.data); 235 236 return ret; 237} 238#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT) 239static int create_kerberos_key_from_string_direct(krb5_context context, 240 krb5_principal host_princ, 241 krb5_data *password, 242 krb5_keyblock *key, 243 krb5_enctype enctype) 244{ 245 int ret; 246 krb5_salt salt; 247 248 ret = krb5_get_pw_salt(context, host_princ, &salt); 249 if (ret) { 250 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret))); 251 return ret; 252 } 253 254 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key); 255 krb5_free_salt(context, salt); 256 257 return ret; 258} 259#else 260#error UNKNOWN_CREATE_KEY_FUNCTIONS 261#endif 262 263 int create_kerberos_key_from_string(krb5_context context, 264 krb5_principal host_princ, 265 krb5_data *password, 266 krb5_keyblock *key, 267 krb5_enctype enctype, 268 bool no_salt) 269{ 270 krb5_principal salt_princ = NULL; 271 int ret; 272 /* 273 * Check if we've determined that the KDC is salting keys for this 274 * principal/enctype in a non-obvious way. If it is, try to match 275 * its behavior. 276 */ 277 if (no_salt) { 278 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length); 279 if (!KRB5_KEY_DATA(key)) { 280 return ENOMEM; 281 } 282 memcpy(KRB5_KEY_DATA(key), password->data, password->length); 283 KRB5_KEY_LENGTH(key) = password->length; 284 KRB5_KEY_TYPE(key) = enctype; 285 return 0; 286 } 287 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype); 288 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype); 289 if (salt_princ) { 290 krb5_free_principal(context, salt_princ); 291 } 292 return ret; 293} 294 295#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES) 296 krb5_error_code get_kerberos_allowed_etypes(krb5_context context, 297 krb5_enctype **enctypes) 298{ 299 return krb5_get_permitted_enctypes(context, enctypes); 300} 301#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES) 302 krb5_error_code get_kerberos_allowed_etypes(krb5_context context, 303 krb5_enctype **enctypes) 304{ 305 return krb5_get_default_in_tkt_etypes(context, enctypes); 306} 307#else 308#error UNKNOWN_GET_ENCTYPES_FUNCTIONS 309#endif 310 311#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) 312 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context, 313 krb5_auth_context auth_context, 314 krb5_keyblock *keyblock) 315{ 316 return krb5_auth_con_setkey(context, auth_context, keyblock); 317} 318#endif 319 320bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx, 321 DATA_BLOB *edata, 322 DATA_BLOB *edata_out) 323{ 324 DATA_BLOB edata_contents; 325 ASN1_DATA *data; 326 int edata_type; 327 328 if (!edata->length) { 329 return False; 330 } 331 332 data = asn1_init(mem_ctx); 333 if (data == NULL) { 334 return false; 335 } 336 337 asn1_load(data, *edata); 338 asn1_start_tag(data, ASN1_SEQUENCE(0)); 339 asn1_start_tag(data, ASN1_CONTEXT(1)); 340 asn1_read_Integer(data, &edata_type); 341 342 if (edata_type != KRB5_PADATA_PW_SALT) { 343 DEBUG(0,("edata is not of required type %d but of type %d\n", 344 KRB5_PADATA_PW_SALT, edata_type)); 345 asn1_free(data); 346 return False; 347 } 348 349 asn1_start_tag(data, ASN1_CONTEXT(2)); 350 asn1_read_OctetString(data, talloc_autofree_context(), &edata_contents); 351 asn1_end_tag(data); 352 asn1_end_tag(data); 353 asn1_end_tag(data); 354 asn1_free(data); 355 356 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length); 357 358 data_blob_free(&edata_contents); 359 360 return True; 361} 362 363 364bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data) 365{ 366 DATA_BLOB pac_contents; 367 ASN1_DATA *data; 368 int data_type; 369 370 if (!auth_data->length) { 371 return False; 372 } 373 374 data = asn1_init(mem_ctx); 375 if (data == NULL) { 376 return false; 377 } 378 379 asn1_load(data, *auth_data); 380 asn1_start_tag(data, ASN1_SEQUENCE(0)); 381 asn1_start_tag(data, ASN1_SEQUENCE(0)); 382 asn1_start_tag(data, ASN1_CONTEXT(0)); 383 asn1_read_Integer(data, &data_type); 384 385 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) { 386 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type)); 387 asn1_free(data); 388 return False; 389 } 390 391 asn1_end_tag(data); 392 asn1_start_tag(data, ASN1_CONTEXT(1)); 393 asn1_read_OctetString(data, talloc_autofree_context(), &pac_contents); 394 asn1_end_tag(data); 395 asn1_end_tag(data); 396 asn1_end_tag(data); 397 asn1_free(data); 398 399 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length); 400 401 data_blob_free(&pac_contents); 402 403 return True; 404} 405 406 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt) 407{ 408 DATA_BLOB auth_data_wrapped; 409 bool got_auth_data_pac = False; 410 int i; 411 412#if defined(HAVE_KRB5_TKT_ENC_PART2) 413 if (tkt->enc_part2 && tkt->enc_part2->authorization_data && 414 tkt->enc_part2->authorization_data[0] && 415 tkt->enc_part2->authorization_data[0]->length) 416 { 417 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) { 418 419 if (tkt->enc_part2->authorization_data[i]->ad_type != 420 KRB5_AUTHDATA_IF_RELEVANT) { 421 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n", 422 tkt->enc_part2->authorization_data[i]->ad_type)); 423 continue; 424 } 425 426 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents, 427 tkt->enc_part2->authorization_data[i]->length); 428 429 /* check if it is a PAC */ 430 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data); 431 data_blob_free(&auth_data_wrapped); 432 433 if (got_auth_data_pac) { 434 return true; 435 } 436 } 437 438 return got_auth_data_pac; 439 } 440 441#else 442 if (tkt->ticket.authorization_data && 443 tkt->ticket.authorization_data->len) 444 { 445 for (i = 0; i < tkt->ticket.authorization_data->len; i++) { 446 447 if (tkt->ticket.authorization_data->val[i].ad_type != 448 KRB5_AUTHDATA_IF_RELEVANT) { 449 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n", 450 tkt->ticket.authorization_data->val[i].ad_type)); 451 continue; 452 } 453 454 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data, 455 tkt->ticket.authorization_data->val[i].ad_data.length); 456 457 /* check if it is a PAC */ 458 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data); 459 data_blob_free(&auth_data_wrapped); 460 461 if (got_auth_data_pac) { 462 return true; 463 } 464 } 465 466 return got_auth_data_pac; 467 } 468#endif 469 return False; 470} 471 472 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt) 473{ 474#if defined(HAVE_KRB5_TKT_ENC_PART2) 475 return tkt->enc_part2->client; 476#else 477 return tkt->client; 478#endif 479} 480 481#if !defined(HAVE_KRB5_LOCATE_KDC) 482 483/* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit 484 * to a public interface for this functionality, so we have to be able to live 485 * without it if the MIT libraries are hiding their internal symbols. 486 */ 487 488#if defined(KRB5_KRBHST_INIT) 489/* Heimdal */ 490 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters) 491{ 492 krb5_krbhst_handle hnd; 493 krb5_krbhst_info *hinfo; 494 krb5_error_code rc; 495 int num_kdcs, i; 496 struct sockaddr *sa; 497 struct addrinfo *ai; 498 499 *addr_pp = NULL; 500 *naddrs = 0; 501 502 rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd); 503 if (rc) { 504 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc))); 505 return rc; 506 } 507 508 for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++) 509 ; 510 511 krb5_krbhst_reset(ctx, hnd); 512 513 if (!num_kdcs) { 514 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n")); 515 krb5_krbhst_free(ctx, hnd); 516 return -1; 517 } 518 519 sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs ); 520 if (!sa) { 521 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n")); 522 krb5_krbhst_free(ctx, hnd); 523 naddrs = 0; 524 return -1; 525 } 526 527 memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs ); 528 529 for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) { 530 531#if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO) 532 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai); 533 if (rc) { 534 DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc))); 535 continue; 536 } 537#endif 538 if (hinfo->ai && hinfo->ai->ai_family == AF_INET) 539 memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr)); 540 } 541 542 krb5_krbhst_free(ctx, hnd); 543 544 *naddrs = num_kdcs; 545 *addr_pp = sa; 546 return 0; 547} 548 549#else /* ! defined(KRB5_KRBHST_INIT) */ 550 551 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, 552 struct sockaddr **addr_pp, int *naddrs, int get_masters) 553{ 554 DEBUG(0, ("unable to explicitly locate the KDC on this platform\n")); 555 return KRB5_KDC_UNREACH; 556} 557 558#endif /* KRB5_KRBHST_INIT */ 559 560#else /* ! HAVE_KRB5_LOCATE_KDC */ 561 562 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, 563 struct sockaddr **addr_pp, int *naddrs, int get_masters) 564{ 565 return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters); 566} 567 568#endif /* HAVE_KRB5_LOCATE_KDC */ 569 570#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME) 571 void krb5_free_unparsed_name(krb5_context context, char *val) 572{ 573 SAFE_FREE(val); 574} 575#endif 576 577 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata) 578{ 579#if defined(HAVE_KRB5_FREE_DATA_CONTENTS) 580 if (pdata->data) { 581 krb5_free_data_contents(context, pdata); 582 } 583#else 584 SAFE_FREE(pdata->data); 585#endif 586} 587 588 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype) 589{ 590#if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS) 591 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype; 592#elif defined(HAVE_KRB5_SESSION_IN_CREDS) 593 KRB5_KEY_TYPE((&pcreds->session)) = enctype; 594#else 595#error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT 596#endif 597} 598 599 bool kerberos_compatible_enctypes(krb5_context context, 600 krb5_enctype enctype1, 601 krb5_enctype enctype2) 602{ 603#if defined(HAVE_KRB5_C_ENCTYPE_COMPARE) 604 krb5_boolean similar = 0; 605 606 krb5_c_enctype_compare(context, enctype1, enctype2, &similar); 607 return similar ? True : False; 608#elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS) 609 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False; 610#endif 611} 612 613static bool ads_cleanup_expired_creds(krb5_context context, 614 krb5_ccache ccache, 615 krb5_creds *credsp) 616{ 617 krb5_error_code retval; 618 const char *cc_type = krb5_cc_get_type(context, ccache); 619 620 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n", 621 cc_type, krb5_cc_get_name(context, ccache), 622 http_timestring(talloc_tos(), credsp->times.endtime))); 623 624 /* we will probably need new tickets if the current ones 625 will expire within 10 seconds. 626 */ 627 if (credsp->times.endtime >= (time(NULL) + 10)) 628 return False; 629 630 /* heimdal won't remove creds from a file ccache, and 631 perhaps we shouldn't anyway, since internally we 632 use memory ccaches, and a FILE one probably means that 633 we're using creds obtained outside of our exectuable 634 */ 635 if (strequal(cc_type, "FILE")) { 636 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type)); 637 return False; 638 } 639 640 retval = krb5_cc_remove_cred(context, ccache, 0, credsp); 641 if (retval) { 642 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n", 643 error_message(retval))); 644 /* If we have an error in this, we want to display it, 645 but continue as though we deleted it */ 646 } 647 return True; 648} 649 650/* Allocate and setup the auth context into the state we need. */ 651 652static krb5_error_code setup_auth_context(krb5_context context, 653 krb5_auth_context *auth_context) 654{ 655 krb5_error_code retval; 656 657 retval = krb5_auth_con_init(context, auth_context ); 658 if (retval) { 659 DEBUG(1,("krb5_auth_con_init failed (%s)\n", 660 error_message(retval))); 661 return retval; 662 } 663 664 /* Ensure this is an addressless ticket. */ 665 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL); 666 if (retval) { 667 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", 668 error_message(retval))); 669 } 670 671 return retval; 672} 673 674static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */ 675 uint32_t gss_flags) 676{ 677 unsigned int orig_length = in_data->length; 678 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE; 679 char *gss_cksum = NULL; 680 681 if (orig_length) { 682 /* Extra length field for delgated ticket. */ 683 base_cksum_size += 4; 684 } 685 686 if ((unsigned int)base_cksum_size + orig_length < 687 (unsigned int)base_cksum_size) { 688 return EINVAL; 689 } 690 691 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length); 692 if (gss_cksum == NULL) { 693 return ENOMEM; 694 } 695 696 memset(gss_cksum, '\0', base_cksum_size + orig_length); 697 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH); 698 699 /* 700 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes. 701 * This matches the behavior of heimdal and mit. 702 * 703 * And it is needed to work against some closed source 704 * SMB servers. 705 * 706 * See bug #7883 707 */ 708 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH); 709 710 SIVAL(gss_cksum, 20, gss_flags); 711 712 if (orig_length) { 713 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */ 714 SSVAL(gss_cksum, 26, orig_length); 715 /* Copy the kerberos KRB_CRED data */ 716 memcpy(gss_cksum + 28, in_data->data, orig_length); 717 free(in_data->data); 718 in_data->data = NULL; 719 in_data->length = 0; 720 } 721 in_data->data = gss_cksum; 722 in_data->length = base_cksum_size + orig_length; 723 return 0; 724} 725 726/* 727 we can't use krb5_mk_req because w2k wants the service to be in a particular format 728*/ 729static krb5_error_code ads_krb5_mk_req(krb5_context context, 730 krb5_auth_context *auth_context, 731 const krb5_flags ap_req_options, 732 const char *principal, 733 krb5_ccache ccache, 734 krb5_data *outbuf, 735 time_t *expire_time, 736 const char *impersonate_princ_s) 737{ 738 krb5_error_code retval; 739 krb5_principal server; 740 krb5_principal impersonate_princ = NULL; 741 krb5_creds * credsp; 742 krb5_creds creds; 743 krb5_data in_data; 744 bool creds_ready = False; 745 int i = 0, maxtries = 3; 746 uint32_t gss_flags = 0; 747 748 ZERO_STRUCT(in_data); 749 750 retval = smb_krb5_parse_name(context, principal, &server); 751 if (retval) { 752 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal)); 753 return retval; 754 } 755 756 if (impersonate_princ_s) { 757 retval = smb_krb5_parse_name(context, impersonate_princ_s, 758 &impersonate_princ); 759 if (retval) { 760 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s)); 761 goto cleanup_princ; 762 } 763 } 764 765 /* obtain ticket & session key */ 766 ZERO_STRUCT(creds); 767 if ((retval = krb5_copy_principal(context, server, &creds.server))) { 768 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n", 769 error_message(retval))); 770 goto cleanup_princ; 771 } 772 773 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) { 774 /* This can commonly fail on smbd startup with no ticket in the cache. 775 * Report at higher level than 1. */ 776 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n", 777 error_message(retval))); 778 goto cleanup_creds; 779 } 780 781 while (!creds_ready && (i < maxtries)) { 782 783 if ((retval = smb_krb5_get_credentials(context, ccache, 784 creds.client, 785 creds.server, 786 impersonate_princ, 787 &credsp))) { 788 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n", 789 principal, error_message(retval))); 790 goto cleanup_creds; 791 } 792 793 /* cope with ticket being in the future due to clock skew */ 794 if ((unsigned)credsp->times.starttime > time(NULL)) { 795 time_t t = time(NULL); 796 int time_offset =(int)((unsigned)credsp->times.starttime-t); 797 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset)); 798 krb5_set_real_time(context, t + time_offset + 1, 0); 799 } 800 801 if (!ads_cleanup_expired_creds(context, ccache, credsp)) { 802 creds_ready = True; 803 } 804 805 i++; 806 } 807 808 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n", 809 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache), 810 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime), 811 (unsigned)credsp->times.endtime)); 812 813 if (expire_time) { 814 *expire_time = (time_t)credsp->times.endtime; 815 } 816 817 /* Allocate the auth_context. */ 818 retval = setup_auth_context(context, auth_context); 819 if (retval) { 820 DEBUG(1,("setup_auth_context failed (%s)\n", 821 error_message(retval))); 822 goto cleanup_creds; 823 } 824 825#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) 826 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) { 827 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket 828 as part of the kerberos exchange. */ 829 830 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") ); 831 832 retval = krb5_auth_con_setuseruserkey(context, 833 *auth_context, 834 &credsp->keyblock ); 835 if (retval) { 836 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n", 837 error_message(retval))); 838 goto cleanup_creds; 839 } 840 841 /* Must use a subkey for forwarded tickets. */ 842 retval = krb5_auth_con_setflags(context, 843 *auth_context, 844 KRB5_AUTH_CONTEXT_USE_SUBKEY); 845 if (retval) { 846 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n", 847 error_message(retval))); 848 goto cleanup_creds; 849 } 850 851 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */ 852 *auth_context, /* Authentication context [in] */ 853 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */ 854 credsp->client, /* Client principal for the tgt [in] */ 855 credsp->server, /* Server principal for the tgt [in] */ 856 ccache, /* Credential cache to use for storage [in] */ 857 1, /* Turn on for "Forwardable ticket" [in] */ 858 &in_data ); /* Resulting response [out] */ 859 860 if (retval) { 861 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n", 862 error_message( retval ) ) ); 863 864 /* 865 * This is not fatal. Delete the *auth_context and continue 866 * with krb5_mk_req_extended to get a non-forwardable ticket. 867 */ 868 869 if (in_data.data) { 870 free( in_data.data ); 871 in_data.data = NULL; 872 in_data.length = 0; 873 } 874 krb5_auth_con_free(context, *auth_context); 875 *auth_context = NULL; 876 retval = setup_auth_context(context, auth_context); 877 if (retval) { 878 DEBUG(1,("setup_auth_context failed (%s)\n", 879 error_message(retval))); 880 goto cleanup_creds; 881 } 882 } else { 883 /* We got a delegated ticket. */ 884 gss_flags |= GSS_C_DELEG_FLAG; 885 } 886 } 887 888 /* Frees and reallocates in_data into a GSS checksum blob. */ 889 retval = create_gss_checksum(&in_data, gss_flags); 890 if (retval) { 891 goto cleanup_data; 892 } 893 894 /* We always want GSS-checksum types. */ 895 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM ); 896 if (retval) { 897 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n", 898 error_message(retval))); 899 goto cleanup_data; 900 } 901#endif 902 903 retval = krb5_mk_req_extended(context, auth_context, ap_req_options, 904 &in_data, credsp, outbuf); 905 if (retval) { 906 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n", 907 error_message(retval))); 908 } 909 910cleanup_data: 911 if (in_data.data) { 912 free( in_data.data ); 913 in_data.length = 0; 914 } 915 916 krb5_free_creds(context, credsp); 917 918cleanup_creds: 919 krb5_free_cred_contents(context, &creds); 920 921cleanup_princ: 922 krb5_free_principal(context, server); 923 if (impersonate_princ) { 924 krb5_free_principal(context, impersonate_princ); 925 } 926 927 return retval; 928} 929 930/* 931 get a kerberos5 ticket for the given service 932*/ 933int cli_krb5_get_ticket(const char *principal, time_t time_offset, 934 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, 935 uint32 extra_ap_opts, const char *ccname, 936 time_t *tgs_expire, 937 const char *impersonate_princ_s) 938 939{ 940 krb5_error_code retval; 941 krb5_data packet; 942 krb5_context context = NULL; 943 krb5_ccache ccdef = NULL; 944 krb5_auth_context auth_context = NULL; 945 krb5_enctype enc_types[] = { 946#ifdef ENCTYPE_ARCFOUR_HMAC 947 ENCTYPE_ARCFOUR_HMAC, 948#endif 949 ENCTYPE_DES_CBC_MD5, 950 ENCTYPE_DES_CBC_CRC, 951 ENCTYPE_NULL}; 952 953 initialize_krb5_error_table(); 954 retval = krb5_init_context(&context); 955 if (retval) { 956 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n", 957 error_message(retval))); 958 goto failed; 959 } 960 961 if (time_offset != 0) { 962 krb5_set_real_time(context, time(NULL) + time_offset, 0); 963 } 964 965 if ((retval = krb5_cc_resolve(context, ccname ? 966 ccname : krb5_cc_default_name(context), &ccdef))) { 967 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n", 968 error_message(retval))); 969 goto failed; 970 } 971 972 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) { 973 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n", 974 error_message(retval))); 975 goto failed; 976 } 977 978 if ((retval = ads_krb5_mk_req(context, 979 &auth_context, 980 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts, 981 principal, 982 ccdef, &packet, 983 tgs_expire, 984 impersonate_princ_s))) { 985 goto failed; 986 } 987 988 get_krb5_smb_session_key(context, auth_context, session_key_krb5, False); 989 990 *ticket = data_blob(packet.data, packet.length); 991 992 kerberos_free_data_contents(context, &packet); 993 994failed: 995 996 if ( context ) { 997 if (ccdef) 998 krb5_cc_close(context, ccdef); 999 if (auth_context) 1000 krb5_auth_con_free(context, auth_context); 1001 krb5_free_context(context); 1002 } 1003 1004 return retval; 1005} 1006 1007 bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote) 1008 { 1009 krb5_keyblock *skey = NULL; 1010 krb5_error_code err = 0; 1011 bool ret = false; 1012 1013 if (remote) { 1014 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey); 1015 } else { 1016 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey); 1017 } 1018 1019 if (err || skey == NULL) { 1020 DEBUG(10, ("KRB5 error getting session key %d\n", err)); 1021 goto done; 1022 } 1023 1024 DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey))); 1025 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey)); 1026 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length); 1027 1028 ret = true; 1029 1030 done: 1031 if (skey) { 1032 krb5_free_keyblock(context, skey); 1033 } 1034 1035 return ret; 1036 } 1037 1038 1039#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT) 1040 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i ); 1041 1042 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i ) 1043{ 1044 static krb5_data kdata; 1045 1046 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i); 1047 kdata.length = strlen((const char *)kdata.data); 1048 return &kdata; 1049} 1050#endif 1051 1052 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry) 1053{ 1054/* Try krb5_free_keytab_entry_contents first, since 1055 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and 1056 * krb5_kt_free_entry but only has a prototype for the first, while the 1057 * second is considered private. 1058 */ 1059#if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS) 1060 return krb5_free_keytab_entry_contents(context, kt_entry); 1061#elif defined(HAVE_KRB5_KT_FREE_ENTRY) 1062 return krb5_kt_free_entry(context, kt_entry); 1063#else 1064#error UNKNOWN_KT_FREE_FUNCTION 1065#endif 1066} 1067 1068 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum, 1069 struct PAC_SIGNATURE_DATA *sig) 1070{ 1071#ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM 1072 cksum->cksumtype = (krb5_cksumtype)sig->type; 1073 cksum->checksum.length = sig->signature.length; 1074 cksum->checksum.data = sig->signature.data; 1075#else 1076 cksum->checksum_type = (krb5_cksumtype)sig->type; 1077 cksum->length = sig->signature.length; 1078 cksum->contents = sig->signature.data; 1079#endif 1080} 1081 1082 krb5_error_code smb_krb5_verify_checksum(krb5_context context, 1083 const krb5_keyblock *keyblock, 1084 krb5_keyusage usage, 1085 krb5_checksum *cksum, 1086 uint8 *data, 1087 size_t length) 1088{ 1089 krb5_error_code ret; 1090 1091 /* verify the checksum */ 1092 1093 /* welcome to the wonderful world of samba's kerberos abstraction layer: 1094 * 1095 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2 1096 * ----------------------------------------------------------------------------- 1097 * krb5_c_verify_checksum - works works 1098 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args) 1099 */ 1100 1101#if defined(HAVE_KRB5_C_VERIFY_CHECKSUM) 1102 { 1103 krb5_boolean checksum_valid = False; 1104 krb5_data input; 1105 1106 input.data = (char *)data; 1107 input.length = length; 1108 1109 ret = krb5_c_verify_checksum(context, 1110 keyblock, 1111 usage, 1112 &input, 1113 cksum, 1114 &checksum_valid); 1115 if (ret) { 1116 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n", 1117 error_message(ret))); 1118 return ret; 1119 } 1120 1121 if (!checksum_valid) 1122 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 1123 } 1124 1125#elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY) 1126 1127 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key 1128 * without enctype and it ignores any key_usage types - Guenther */ 1129 1130 { 1131 1132 krb5_crypto crypto; 1133 ret = krb5_crypto_init(context, 1134 keyblock, 1135 0, 1136 &crypto); 1137 if (ret) { 1138 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n", 1139 error_message(ret))); 1140 return ret; 1141 } 1142 1143 ret = krb5_verify_checksum(context, 1144 crypto, 1145 usage, 1146 data, 1147 length, 1148 cksum); 1149 1150 krb5_crypto_destroy(context, crypto); 1151 } 1152 1153#else 1154#error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION 1155#endif 1156 1157 return ret; 1158} 1159 1160 time_t get_authtime_from_tkt(krb5_ticket *tkt) 1161{ 1162#if defined(HAVE_KRB5_TKT_ENC_PART2) 1163 return tkt->enc_part2->times.authtime; 1164#else 1165 return tkt->ticket.authtime; 1166#endif 1167} 1168 1169#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */ 1170static int get_kvno_from_ap_req(krb5_ap_req *ap_req) 1171{ 1172#ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */ 1173 if (ap_req->ticket->enc_part.kvno) 1174 return ap_req->ticket->enc_part.kvno; 1175#else /* Heimdal */ 1176 if (ap_req->ticket.enc_part.kvno) 1177 return *ap_req->ticket.enc_part.kvno; 1178#endif 1179 return 0; 1180} 1181 1182static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req) 1183{ 1184#ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */ 1185 return ap_req->ticket.enc_part.etype; 1186#else /* MIT */ 1187 return ap_req->ticket->enc_part.enctype; 1188#endif 1189} 1190#endif /* HAVE_KRB5_DECODE_AP_REQ */ 1191 1192static krb5_error_code 1193get_key_from_keytab(krb5_context context, 1194 krb5_const_principal server, 1195 krb5_enctype enctype, 1196 krb5_kvno kvno, 1197 krb5_keyblock **out_key) 1198{ 1199 krb5_keytab_entry entry; 1200 krb5_error_code ret; 1201 krb5_keytab keytab; 1202 char *name = NULL; 1203 krb5_keyblock *keyp; 1204 1205 /* We have to open a new keytab handle here, as MIT does 1206 an implicit open/getnext/close on krb5_kt_get_entry. We 1207 may be in the middle of a keytab enumeration when this is 1208 called. JRA. */ 1209 1210 ret = smb_krb5_open_keytab(context, NULL, False, &keytab); 1211 if (ret) { 1212 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret))); 1213 return ret; 1214 } 1215 1216 if ( DEBUGLEVEL >= 10 ) { 1217 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) { 1218 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n", 1219 kvno, enctype, name)); 1220 TALLOC_FREE(name); 1221 } 1222 } 1223 1224 ret = krb5_kt_get_entry(context, 1225 keytab, 1226 server, 1227 kvno, 1228 enctype, 1229 &entry); 1230 1231 if (ret) { 1232 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret))); 1233 goto out; 1234 } 1235 1236 keyp = KRB5_KT_KEY(&entry); 1237 1238 ret = krb5_copy_keyblock(context, keyp, out_key); 1239 if (ret) { 1240 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret))); 1241 goto out; 1242 } 1243 1244 smb_krb5_kt_free_entry(context, &entry); 1245 1246out: 1247 krb5_kt_close(context, keytab); 1248 return ret; 1249} 1250 1251/* Prototypes */ 1252 1253 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context, 1254 const krb5_data *inbuf, 1255 krb5_kvno *kvno, 1256 krb5_enctype *enctype) 1257{ 1258#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */ 1259 { 1260 krb5_error_code ret; 1261 krb5_ap_req ap_req; 1262 1263 ret = krb5_decode_ap_req(context, inbuf, &ap_req); 1264 if (ret) 1265 return ret; 1266 1267 *kvno = get_kvno_from_ap_req(&ap_req); 1268 *enctype = get_enctype_from_ap_req(&ap_req); 1269 1270 free_AP_REQ(&ap_req); 1271 return 0; 1272 } 1273#endif 1274 1275 /* Possibly not an appropriate error code. */ 1276 return KRB5KDC_ERR_BADOPTION; 1277} 1278 1279 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context, 1280 krb5_auth_context *auth_context, 1281 const krb5_data *inbuf, 1282 krb5_const_principal server, 1283 krb5_keytab keytab, 1284 krb5_flags *ap_req_options, 1285 krb5_ticket **ticket, 1286 krb5_keyblock **keyblock) 1287{ 1288 krb5_error_code ret; 1289 krb5_kvno kvno; 1290 krb5_enctype enctype; 1291 krb5_keyblock *local_keyblock; 1292 1293 ret = krb5_rd_req(context, 1294 auth_context, 1295 inbuf, 1296 server, 1297 keytab, 1298 ap_req_options, 1299 ticket); 1300 if (ret) { 1301 return ret; 1302 } 1303 1304#ifdef KRB5_TICKET_HAS_KEYINFO 1305 enctype = (*ticket)->enc_part.enctype; 1306 kvno = (*ticket)->enc_part.kvno; 1307#else 1308 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype); 1309 if (ret) { 1310 return ret; 1311 } 1312#endif 1313 1314 ret = get_key_from_keytab(context, 1315 server, 1316 enctype, 1317 kvno, 1318 &local_keyblock); 1319 if (ret) { 1320 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n")); 1321 goto out; 1322 } 1323 1324out: 1325 if (ret && local_keyblock != NULL) { 1326 krb5_free_keyblock(context, local_keyblock); 1327 } else { 1328 *keyblock = local_keyblock; 1329 } 1330 1331 return ret; 1332} 1333 1334 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context, 1335 const char *name, 1336 krb5_principal *principal) 1337{ 1338#ifdef HAVE_KRB5_PARSE_NAME_NOREALM 1339 return smb_krb5_parse_name_norealm_conv(context, name, principal); 1340#endif 1341 1342 /* we are cheating here because parse_name will in fact set the realm. 1343 * We don't care as the only caller of smb_krb5_parse_name_norealm 1344 * ignores the realm anyway when calling 1345 * smb_krb5_principal_compare_any_realm later - Guenther */ 1346 1347 return smb_krb5_parse_name(context, name, principal); 1348} 1349 1350 bool smb_krb5_principal_compare_any_realm(krb5_context context, 1351 krb5_const_principal princ1, 1352 krb5_const_principal princ2) 1353{ 1354#ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM 1355 1356 return krb5_principal_compare_any_realm(context, princ1, princ2); 1357 1358/* krb5_princ_size is a macro in MIT */ 1359#elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size) 1360 1361 int i, len1, len2; 1362 const krb5_data *p1, *p2; 1363 1364 len1 = krb5_princ_size(context, princ1); 1365 len2 = krb5_princ_size(context, princ2); 1366 1367 if (len1 != len2) 1368 return False; 1369 1370 for (i = 0; i < len1; i++) { 1371 1372 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i); 1373 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i); 1374 1375 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length)) 1376 return False; 1377 } 1378 1379 return True; 1380#else 1381#error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION 1382#endif 1383} 1384 1385 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */ 1386 const char *client_string, /* gd@BER.SUSE.DE */ 1387 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */ 1388 time_t *expire_time) 1389{ 1390 krb5_error_code ret; 1391 krb5_context context = NULL; 1392 krb5_ccache ccache = NULL; 1393 krb5_principal client = NULL; 1394 krb5_creds creds, creds_in, *creds_out = NULL; 1395 1396 ZERO_STRUCT(creds); 1397 ZERO_STRUCT(creds_in); 1398 1399 initialize_krb5_error_table(); 1400 ret = krb5_init_context(&context); 1401 if (ret) { 1402 goto done; 1403 } 1404 1405 if (!ccache_string) { 1406 ccache_string = krb5_cc_default_name(context); 1407 } 1408 1409 if (!ccache_string) { 1410 ret = EINVAL; 1411 goto done; 1412 } 1413 1414 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string)); 1415 1416 /* FIXME: we should not fall back to defaults */ 1417 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache); 1418 if (ret) { 1419 goto done; 1420 } 1421 1422 if (client_string) { 1423 ret = smb_krb5_parse_name(context, client_string, &client); 1424 if (ret) { 1425 goto done; 1426 } 1427 } else { 1428 ret = krb5_cc_get_principal(context, ccache, &client); 1429 if (ret) { 1430 goto done; 1431 } 1432 } 1433 1434#ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */ 1435 { 1436 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string)); 1437 if (ret) { 1438 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret))); 1439 goto done; 1440 } 1441 } 1442#elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */ 1443 { 1444 krb5_kdc_flags flags; 1445 krb5_realm *client_realm = NULL; 1446 1447 ret = krb5_copy_principal(context, client, &creds_in.client); 1448 if (ret) { 1449 goto done; 1450 } 1451 1452 if (service_string) { 1453 ret = smb_krb5_parse_name(context, service_string, &creds_in.server); 1454 if (ret) { 1455 goto done; 1456 } 1457 } else { 1458 /* build tgt service by default */ 1459 client_realm = krb5_princ_realm(context, creds_in.client); 1460 if (!client_realm) { 1461 ret = ENOMEM; 1462 goto done; 1463 } 1464 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL); 1465 if (ret) { 1466 goto done; 1467 } 1468 } 1469 1470 flags.i = 0; 1471 flags.b.renewable = flags.b.renew = True; 1472 1473 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out); 1474 if (ret) { 1475 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret))); 1476 goto done; 1477 } 1478 1479 creds = *creds_out; 1480 } 1481#else 1482#error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE 1483#endif 1484 1485 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */ 1486 ret = krb5_cc_initialize(context, ccache, client); 1487 if (ret) { 1488 goto done; 1489 } 1490 1491 ret = krb5_cc_store_cred(context, ccache, &creds); 1492 1493 if (expire_time) { 1494 *expire_time = (time_t) creds.times.endtime; 1495 } 1496 1497done: 1498 krb5_free_cred_contents(context, &creds_in); 1499 1500 if (creds_out) { 1501 krb5_free_creds(context, creds_out); 1502 } else { 1503 krb5_free_cred_contents(context, &creds); 1504 } 1505 1506 if (client) { 1507 krb5_free_principal(context, client); 1508 } 1509 if (ccache) { 1510 krb5_cc_close(context, ccache); 1511 } 1512 if (context) { 1513 krb5_free_context(context); 1514 } 1515 1516 return ret; 1517} 1518 1519 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr) 1520{ 1521 krb5_error_code ret = 0; 1522 if (addr == NULL) { 1523 return ret; 1524 } 1525#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ 1526 krb5_free_addresses(context, addr->addrs); 1527#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */ 1528 ret = krb5_free_addresses(context, addr->addrs); 1529 SAFE_FREE(addr->addrs); 1530#endif 1531 SAFE_FREE(addr); 1532 addr = NULL; 1533 return ret; 1534} 1535 1536 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr) 1537{ 1538 krb5_error_code ret = 0; 1539 nstring buf; 1540#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ 1541 krb5_address **addrs = NULL; 1542#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */ 1543 krb5_addresses *addrs = NULL; 1544#endif 1545 1546 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses)); 1547 if (*kerb_addr == NULL) { 1548 return ENOMEM; 1549 } 1550 1551 put_name(buf, global_myname(), ' ', 0x20); 1552 1553#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ 1554 { 1555 int num_addr = 2; 1556 1557 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr); 1558 if (addrs == NULL) { 1559 SAFE_FREE(*kerb_addr); 1560 return ENOMEM; 1561 } 1562 1563 memset(addrs, 0, sizeof(krb5_address *) * num_addr); 1564 1565 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address)); 1566 if (addrs[0] == NULL) { 1567 SAFE_FREE(addrs); 1568 SAFE_FREE(*kerb_addr); 1569 return ENOMEM; 1570 } 1571 1572 addrs[0]->magic = KV5M_ADDRESS; 1573 addrs[0]->addrtype = KRB5_ADDR_NETBIOS; 1574 addrs[0]->length = MAX_NETBIOSNAME_LEN; 1575 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length); 1576 if (addrs[0]->contents == NULL) { 1577 SAFE_FREE(addrs[0]); 1578 SAFE_FREE(addrs); 1579 SAFE_FREE(*kerb_addr); 1580 return ENOMEM; 1581 } 1582 1583 memcpy(addrs[0]->contents, buf, addrs[0]->length); 1584 1585 addrs[1] = NULL; 1586 } 1587#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */ 1588 { 1589 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses)); 1590 if (addrs == NULL) { 1591 SAFE_FREE(*kerb_addr); 1592 return ENOMEM; 1593 } 1594 1595 memset(addrs, 0, sizeof(krb5_addresses)); 1596 1597 addrs->len = 1; 1598 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address)); 1599 if (addrs->val == NULL) { 1600 SAFE_FREE(addrs); 1601 SAFE_FREE(kerb_addr); 1602 return ENOMEM; 1603 } 1604 1605 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS; 1606 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN; 1607 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length); 1608 if (addrs->val[0].address.data == NULL) { 1609 SAFE_FREE(addrs->val); 1610 SAFE_FREE(addrs); 1611 SAFE_FREE(*kerb_addr); 1612 return ENOMEM; 1613 } 1614 1615 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length); 1616 } 1617#else 1618#error UNKNOWN_KRB5_ADDRESS_FORMAT 1619#endif 1620 (*kerb_addr)->addrs = addrs; 1621 1622 return ret; 1623} 1624 1625 void smb_krb5_free_error(krb5_context context, krb5_error *krberror) 1626{ 1627#ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */ 1628 krb5_free_error_contents(context, krberror); 1629#else /* MIT */ 1630 krb5_free_error(context, krberror); 1631#endif 1632} 1633 1634 krb5_error_code handle_krberror_packet(krb5_context context, 1635 krb5_data *packet) 1636{ 1637 krb5_error_code ret; 1638 bool got_error_code = False; 1639 1640 DEBUG(10,("handle_krberror_packet: got error packet\n")); 1641 1642#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */ 1643 { 1644 krb5_error krberror; 1645 1646 if ((ret = krb5_rd_error(context, packet, &krberror))) { 1647 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n", 1648 error_message(ret))); 1649 return ret; 1650 } 1651 1652 if (krberror.e_data == NULL || krberror.e_data->data == NULL) { 1653 ret = (krb5_error_code) krberror.error_code; 1654 got_error_code = True; 1655 } 1656 1657 smb_krb5_free_error(context, &krberror); 1658 } 1659#else /* MIT */ 1660 { 1661 krb5_error *krberror; 1662 1663 if ((ret = krb5_rd_error(context, packet, &krberror))) { 1664 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n", 1665 error_message(ret))); 1666 return ret; 1667 } 1668 1669 if (krberror->e_data.data == NULL) { 1670#if defined(ERROR_TABLE_BASE_krb5) 1671 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error; 1672#else 1673 ret = (krb5_error_code)krberror->error; 1674#endif 1675 got_error_code = True; 1676 } 1677 smb_krb5_free_error(context, krberror); 1678 } 1679#endif 1680 if (got_error_code) { 1681 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n", 1682 error_message(ret), ret)); 1683 } 1684 return ret; 1685} 1686 1687 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context, 1688 krb5_get_init_creds_opt **opt) 1689{ 1690#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC 1691 /* Heimdal or modern MIT version */ 1692 return krb5_get_init_creds_opt_alloc(context, opt); 1693#else 1694 /* Historical MIT version */ 1695 krb5_get_init_creds_opt *my_opt; 1696 1697 *opt = NULL; 1698 1699 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) { 1700 return ENOMEM; 1701 } 1702 1703 krb5_get_init_creds_opt_init(my_opt); 1704 1705 *opt = my_opt; 1706 return 0; 1707#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */ 1708} 1709 1710 void smb_krb5_get_init_creds_opt_free(krb5_context context, 1711 krb5_get_init_creds_opt *opt) 1712{ 1713#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE 1714 1715#ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT 1716 /* Modern MIT or Heimdal version */ 1717 krb5_get_init_creds_opt_free(context, opt); 1718#else 1719 /* Heimdal version */ 1720 krb5_get_init_creds_opt_free(opt); 1721#endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */ 1722 1723#else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */ 1724 /* Historical MIT version */ 1725 SAFE_FREE(opt); 1726 opt = NULL; 1727#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */ 1728} 1729 1730 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry) 1731{ 1732 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry)); 1733} 1734 1735 1736/* caller needs to free etype_s */ 1737 krb5_error_code smb_krb5_enctype_to_string(krb5_context context, 1738 krb5_enctype enctype, 1739 char **etype_s) 1740{ 1741#ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG 1742 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */ 1743#elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG) 1744 char buf[256]; 1745 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */ 1746 if (ret) { 1747 return ret; 1748 } 1749 *etype_s = SMB_STRDUP(buf); 1750 if (!*etype_s) { 1751 return ENOMEM; 1752 } 1753 return ret; 1754#else 1755#error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION 1756#endif 1757} 1758 1759 krb5_error_code smb_krb5_mk_error(krb5_context context, 1760 krb5_error_code error_code, 1761 const krb5_principal server, 1762 krb5_data *reply) 1763{ 1764#ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */ 1765 /* 1766 * The MIT interface is *terrible*. 1767 * We have to construct this ourselves... 1768 */ 1769 krb5_error e; 1770 1771 memset(&e, 0, sizeof(e)); 1772 krb5_us_timeofday(context, &e.stime, &e.susec); 1773 e.server = server; 1774#if defined(krb5_err_base) 1775 e.error = error_code - krb5_err_base; 1776#elif defined(ERROR_TABLE_BASE_krb5) 1777 e.error = error_code - ERROR_TABLE_BASE_krb5; 1778#else 1779 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */ 1780#endif 1781 1782 return krb5_mk_error(context, &e, reply); 1783#else /* Heimdal. */ 1784 return krb5_mk_error(context, 1785 error_code, 1786 NULL, 1787 NULL, /* e_data */ 1788 NULL, 1789 server, 1790 NULL, 1791 NULL, 1792 reply); 1793#endif 1794} 1795 1796/********************************************************************** 1797 * Open a krb5 keytab with flags, handles readonly or readwrite access and 1798 * allows to process non-default keytab names. 1799 * @param context krb5_context 1800 * @param keytab_name_req string 1801 * @param write_access bool if writable keytab is required 1802 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close()) 1803 * @return krb5_error_code 1804**********************************************************************/ 1805 1806/* This MAX_NAME_LEN is a constant defined in krb5.h */ 1807#ifndef MAX_KEYTAB_NAME_LEN 1808#define MAX_KEYTAB_NAME_LEN 1100 1809#endif 1810 1811 krb5_error_code smb_krb5_open_keytab(krb5_context context, 1812 const char *keytab_name_req, 1813 bool write_access, 1814 krb5_keytab *keytab) 1815{ 1816 krb5_error_code ret = 0; 1817 TALLOC_CTX *mem_ctx; 1818 char keytab_string[MAX_KEYTAB_NAME_LEN]; 1819 char *kt_str = NULL; 1820 bool found_valid_name = False; 1821 const char *pragma = "FILE"; 1822 const char *tmp = NULL; 1823 1824 if (!write_access && !keytab_name_req) { 1825 /* caller just wants to read the default keytab readonly, so be it */ 1826 return krb5_kt_default(context, keytab); 1827 } 1828 1829 mem_ctx = talloc_init("smb_krb5_open_keytab"); 1830 if (!mem_ctx) { 1831 return ENOMEM; 1832 } 1833 1834#ifdef HAVE_WRFILE_KEYTAB 1835 if (write_access) { 1836 pragma = "WRFILE"; 1837 } 1838#endif 1839 1840 if (keytab_name_req) { 1841 1842 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) { 1843 ret = KRB5_CONFIG_NOTENUFSPACE; 1844 goto out; 1845 } 1846 1847 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) || 1848 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) { 1849 tmp = keytab_name_req; 1850 goto resolve; 1851 } 1852 1853 if (keytab_name_req[0] != '/') { 1854 ret = KRB5_KT_BADNAME; 1855 goto out; 1856 } 1857 1858 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req); 1859 if (!tmp) { 1860 ret = ENOMEM; 1861 goto out; 1862 } 1863 1864 goto resolve; 1865 } 1866 1867 /* we need to handle more complex keytab_strings, like: 1868 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */ 1869 1870 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2); 1871 if (ret) { 1872 goto out; 1873 } 1874 1875 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string)); 1876 1877 tmp = talloc_strdup(mem_ctx, keytab_string); 1878 if (!tmp) { 1879 ret = ENOMEM; 1880 goto out; 1881 } 1882 1883 if (strncmp(tmp, "ANY:", 4) == 0) { 1884 tmp += 4; 1885 } 1886 1887 memset(&keytab_string, '\0', sizeof(keytab_string)); 1888 1889 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) { 1890 if (strncmp(kt_str, "WRFILE:", 7) == 0) { 1891 found_valid_name = True; 1892 tmp = kt_str; 1893 tmp += 7; 1894 } 1895 1896 if (strncmp(kt_str, "FILE:", 5) == 0) { 1897 found_valid_name = True; 1898 tmp = kt_str; 1899 tmp += 5; 1900 } 1901 1902 if (tmp[0] == '/') { 1903 /* Treat as a FILE: keytab definition. */ 1904 found_valid_name = true; 1905 } 1906 1907 if (found_valid_name) { 1908 if (tmp[0] != '/') { 1909 ret = KRB5_KT_BADNAME; 1910 goto out; 1911 } 1912 1913 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp); 1914 if (!tmp) { 1915 ret = ENOMEM; 1916 goto out; 1917 } 1918 break; 1919 } 1920 } 1921 1922 if (!found_valid_name) { 1923 ret = KRB5_KT_UNKNOWN_TYPE; 1924 goto out; 1925 } 1926 1927 resolve: 1928 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp)); 1929 ret = krb5_kt_resolve(context, tmp, keytab); 1930 1931 out: 1932 TALLOC_FREE(mem_ctx); 1933 return ret; 1934} 1935 1936krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx, 1937 krb5_context context, 1938 krb5_keytab keytab, 1939 const char **keytab_name) 1940{ 1941 char keytab_string[MAX_KEYTAB_NAME_LEN]; 1942 krb5_error_code ret = 0; 1943 1944 ret = krb5_kt_get_name(context, keytab, 1945 keytab_string, MAX_KEYTAB_NAME_LEN - 2); 1946 if (ret) { 1947 return ret; 1948 } 1949 1950 *keytab_name = talloc_strdup(mem_ctx, keytab_string); 1951 if (!*keytab_name) { 1952 return ENOMEM; 1953 } 1954 1955 return ret; 1956} 1957 1958#if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \ 1959 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \ 1960 defined(HAVE_KRB5_GET_CREDS) 1961static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context, 1962 krb5_ccache ccache, 1963 krb5_principal me, 1964 krb5_principal server, 1965 krb5_principal impersonate_princ, 1966 krb5_creds **out_creds) 1967{ 1968 krb5_error_code ret; 1969 krb5_get_creds_opt opt; 1970 1971 ret = krb5_get_creds_opt_alloc(context, &opt); 1972 if (ret) { 1973 goto done; 1974 } 1975 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE); 1976 1977 if (impersonate_princ) { 1978 ret = krb5_get_creds_opt_set_impersonate(context, opt, 1979 impersonate_princ); 1980 if (ret) { 1981 goto done; 1982 } 1983 } 1984 1985 ret = krb5_get_creds(context, opt, ccache, server, out_creds); 1986 if (ret) { 1987 goto done; 1988 } 1989 1990 done: 1991 if (opt) { 1992 krb5_get_creds_opt_free(context, opt); 1993 } 1994 return ret; 1995} 1996#endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */ 1997 1998#ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER 1999static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context, 2000 krb5_ccache ccache, 2001 krb5_principal me, 2002 krb5_principal server, 2003 krb5_principal impersonate_princ, 2004 krb5_creds **out_creds) 2005{ 2006 krb5_error_code ret; 2007 krb5_creds in_creds; 2008 2009#if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER 2010krb5_error_code KRB5_CALLCONV 2011krb5_get_credentials_for_user(krb5_context context, krb5_flags options, 2012 krb5_ccache ccache, krb5_creds *in_creds, 2013 krb5_data *subject_cert, 2014 krb5_creds **out_creds); 2015#endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */ 2016 2017 ZERO_STRUCT(in_creds); 2018 2019 if (impersonate_princ) { 2020 2021 in_creds.server = me; 2022 in_creds.client = impersonate_princ; 2023 2024 ret = krb5_get_credentials_for_user(context, 2025 0, /* krb5_flags options */ 2026 ccache, 2027 &in_creds, 2028 NULL, /* krb5_data *subject_cert */ 2029 out_creds); 2030 } else { 2031 in_creds.client = me; 2032 in_creds.server = server; 2033 2034 ret = krb5_get_credentials(context, 0, ccache, 2035 &in_creds, out_creds); 2036 } 2037 2038 return ret; 2039} 2040#endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */ 2041 2042/* 2043 * smb_krb5_get_credentials 2044 * 2045 * @brief Get krb5 credentials for a server 2046 * 2047 * @param[in] context An initialized krb5_context 2048 * @param[in] ccache An initialized krb5_ccache 2049 * @param[in] me The krb5_principal of the caller 2050 * @param[in] server The krb5_principal of the requested service 2051 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional) 2052 * @param[out] out_creds The returned krb5_creds structure 2053 * @return krb5_error_code 2054 * 2055 */ 2056krb5_error_code smb_krb5_get_credentials(krb5_context context, 2057 krb5_ccache ccache, 2058 krb5_principal me, 2059 krb5_principal server, 2060 krb5_principal impersonate_princ, 2061 krb5_creds **out_creds) 2062{ 2063 krb5_error_code ret; 2064 krb5_creds *creds = NULL; 2065 2066 *out_creds = NULL; 2067 2068 if (impersonate_princ) { 2069#ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */ 2070 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds); 2071#elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */ 2072 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds); 2073#else 2074 ret = ENOTSUP; 2075#endif 2076 } else { 2077 krb5_creds in_creds; 2078 2079 ZERO_STRUCT(in_creds); 2080 2081 in_creds.client = me; 2082 in_creds.server = server; 2083 2084 ret = krb5_get_credentials(context, 0, ccache, 2085 &in_creds, &creds); 2086 } 2087 if (ret) { 2088 goto done; 2089 } 2090 2091 ret = krb5_cc_store_cred(context, ccache, creds); 2092 if (ret) { 2093 goto done; 2094 } 2095 2096 if (out_creds) { 2097 *out_creds = creds; 2098 } 2099 2100 done: 2101 if (creds && ret) { 2102 krb5_free_creds(context, creds); 2103 } 2104 2105 return ret; 2106} 2107 2108/* 2109 * smb_krb5_get_creds 2110 * 2111 * @brief Get krb5 credentials for a server 2112 * 2113 * @param[in] server_s The string name of the service 2114 * @param[in] time_offset The offset to the KDCs time in seconds (optional) 2115 * @param[in] cc The krb5 credential cache string name (optional) 2116 * @param[in] impersonate_princ_s The string principal name to impersonate (optional) 2117 * @param[out] creds_p The returned krb5_creds structure 2118 * @return krb5_error_code 2119 * 2120 */ 2121krb5_error_code smb_krb5_get_creds(const char *server_s, 2122 time_t time_offset, 2123 const char *cc, 2124 const char *impersonate_princ_s, 2125 krb5_creds **creds_p) 2126{ 2127 krb5_error_code ret; 2128 krb5_context context = NULL; 2129 krb5_principal me = NULL; 2130 krb5_principal server = NULL; 2131 krb5_principal impersonate_princ = NULL; 2132 krb5_creds *creds = NULL; 2133 krb5_ccache ccache = NULL; 2134 2135 *creds_p = NULL; 2136 2137 initialize_krb5_error_table(); 2138 ret = krb5_init_context(&context); 2139 if (ret) { 2140 goto done; 2141 } 2142 2143 if (time_offset != 0) { 2144 krb5_set_real_time(context, time(NULL) + time_offset, 0); 2145 } 2146 2147 ret = krb5_cc_resolve(context, cc ? cc : 2148 krb5_cc_default_name(context), &ccache); 2149 if (ret) { 2150 goto done; 2151 } 2152 2153 ret = krb5_cc_get_principal(context, ccache, &me); 2154 if (ret) { 2155 goto done; 2156 } 2157 2158 ret = smb_krb5_parse_name(context, server_s, &server); 2159 if (ret) { 2160 goto done; 2161 } 2162 2163 if (impersonate_princ_s) { 2164 ret = smb_krb5_parse_name(context, impersonate_princ_s, 2165 &impersonate_princ); 2166 if (ret) { 2167 goto done; 2168 } 2169 } 2170 2171 ret = smb_krb5_get_credentials(context, ccache, 2172 me, server, impersonate_princ, 2173 &creds); 2174 if (ret) { 2175 goto done; 2176 } 2177 2178 ret = krb5_cc_store_cred(context, ccache, creds); 2179 if (ret) { 2180 goto done; 2181 } 2182 2183 if (creds_p) { 2184 *creds_p = creds; 2185 } 2186 2187 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n", 2188 server_s)); 2189 2190 if (impersonate_princ_s) { 2191 char *client = NULL; 2192 2193 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client); 2194 if (ret) { 2195 goto done; 2196 } 2197 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n", 2198 client)); 2199 TALLOC_FREE(client); 2200 } 2201 2202 done: 2203 if (!context) { 2204 return ret; 2205 } 2206 2207 if (creds && ret) { 2208 krb5_free_creds(context, creds); 2209 } 2210 if (server) { 2211 krb5_free_principal(context, server); 2212 } 2213 if (me) { 2214 krb5_free_principal(context, me); 2215 } 2216 if (impersonate_princ) { 2217 krb5_free_principal(context, impersonate_princ); 2218 } 2219 if (ccache) { 2220 krb5_cc_close(context, ccache); 2221 } 2222 krb5_free_context(context); 2223 2224 return ret; 2225} 2226 2227/* 2228 * smb_krb5_principal_get_realm 2229 * 2230 * @brief Get realm of a principal 2231 * 2232 * @param[in] context The krb5_context 2233 * @param[in] principal The principal 2234 * @return pointer to the realm 2235 * 2236 */ 2237 2238char *smb_krb5_principal_get_realm(krb5_context context, 2239 krb5_principal principal) 2240{ 2241#ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */ 2242 return krb5_principal_get_realm(context, principal); 2243#elif defined(krb5_princ_realm) /* MIT */ 2244 krb5_data *realm; 2245 realm = krb5_princ_realm(context, principal); 2246 return (char *)realm->data; 2247#else 2248 return NULL; 2249#endif 2250} 2251 2252#else /* HAVE_KRB5 */ 2253 /* this saves a few linking headaches */ 2254 int cli_krb5_get_ticket(const char *principal, time_t time_offset, 2255 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts, 2256 const char *ccname, time_t *tgs_expire, 2257 const char *impersonate_princ_s) 2258{ 2259 DEBUG(0,("NO KERBEROS SUPPORT\n")); 2260 return 1; 2261} 2262 2263#endif 2264