1 /* $NetBSD: kerberos5.c,v 1.9 2023/06/19 21:41:41 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2007 Kungliga Tekniska Hgskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "kdc_locl.h" 37 38 #define MAX_TIME ((time_t)((1U << 31) - 1)) 39 40 void 41 _kdc_fix_time(time_t **t) 42 { 43 if(*t == NULL){ 44 ALLOC(*t); 45 **t = MAX_TIME; 46 } 47 if(**t == 0) **t = MAX_TIME; /* fix for old clients */ 48 } 49 50 static int 51 realloc_method_data(METHOD_DATA *md) 52 { 53 PA_DATA *pa; 54 pa = realloc(md->val, (md->len + 1) * sizeof(*md->val)); 55 if(pa == NULL) 56 return ENOMEM; 57 md->val = pa; 58 md->len++; 59 return 0; 60 } 61 62 static void 63 set_salt_padata(METHOD_DATA *md, Salt *salt) 64 { 65 if (salt) { 66 realloc_method_data(md); 67 md->val[md->len - 1].padata_type = salt->type; 68 der_copy_octet_string(&salt->salt, 69 &md->val[md->len - 1].padata_value); 70 } 71 } 72 73 const PA_DATA* 74 _kdc_find_padata(const KDC_REQ *req, int *start, int type) 75 { 76 if (req->padata == NULL) 77 return NULL; 78 79 while((size_t)*start < req->padata->len){ 80 (*start)++; 81 if(req->padata->val[*start - 1].padata_type == (unsigned)type) 82 return &req->padata->val[*start - 1]; 83 } 84 return NULL; 85 } 86 87 /* 88 * This is a hack to allow predefined weak services, like afs to 89 * still use weak types 90 */ 91 92 krb5_boolean 93 _kdc_is_weak_exception(krb5_principal principal, krb5_enctype etype) 94 { 95 if (principal->name.name_string.len > 0 && 96 strcmp(principal->name.name_string.val[0], "afs") == 0 && 97 (etype == (krb5_enctype)ETYPE_DES_CBC_CRC 98 || etype == (krb5_enctype)ETYPE_DES_CBC_MD4 99 || etype == (krb5_enctype)ETYPE_DES_CBC_MD5)) 100 return TRUE; 101 return FALSE; 102 } 103 104 105 /* 106 * Detect if `key' is the using the the precomputed `default_salt'. 107 */ 108 109 static krb5_boolean 110 is_default_salt_p(const krb5_salt *default_salt, const Key *key) 111 { 112 if (key->salt == NULL) 113 return TRUE; 114 if (default_salt->salttype != key->salt->type) 115 return FALSE; 116 if (krb5_data_cmp(&default_salt->saltvalue, &key->salt->salt)) 117 return FALSE; 118 return TRUE; 119 } 120 121 /* 122 * Detect if `key' is the using the the precomputed `default_salt' 123 * (for des-cbc-crc) or any salt otherwise. 124 * 125 * This is for avoiding Kerberos v4 (yes really) keys in AS-REQ as 126 * that salt is strange, and a buggy client will try to use the 127 * principal as the salt and not the returned value. 128 */ 129 130 static krb5_boolean 131 is_good_salt_p(const krb5_salt *default_salt, const Key *key) 132 { 133 if (key->key.keytype == KRB5_ENCTYPE_DES_CBC_CRC) 134 return is_default_salt_p(default_salt, key); 135 136 return TRUE; 137 } 138 139 krb5_boolean 140 _kdc_is_anon_request(const KDC_REQ *req) 141 { 142 const KDC_REQ_BODY *b = &req->req_body; 143 144 /* 145 * Versions of Heimdal from 0.9rc1 through 1.50 use bit 14 instead 146 * of 16 for request_anonymous, as indicated in the anonymous draft 147 * prior to version 11. Bit 14 is assigned to S4U2Proxy, but S4U2Proxy 148 * requests are only sent to the TGS and, in any case, would have an 149 * additional ticket present. 150 */ 151 return b->kdc_options.request_anonymous || 152 (b->kdc_options.cname_in_addl_tkt && !b->additional_tickets); 153 } 154 155 /* 156 * return the first appropriate key of `princ' in `ret_key'. Look for 157 * all the etypes in (`etypes', `len'), stopping as soon as we find 158 * one, but preferring one that has default salt. 159 */ 160 161 krb5_error_code 162 _kdc_find_etype(krb5_context context, krb5_boolean use_strongest_session_key, 163 krb5_boolean is_preauth, hdb_entry_ex *princ, 164 krb5_enctype *etypes, unsigned len, 165 krb5_enctype *ret_enctype, Key **ret_key) 166 { 167 krb5_error_code ret; 168 krb5_salt def_salt; 169 krb5_enctype enctype = (krb5_enctype)ETYPE_NULL; 170 const krb5_enctype *p; 171 Key *key = NULL; 172 int i, k; 173 174 /* We'll want to avoid keys with v4 salted keys in the pre-auth case... */ 175 ret = krb5_get_pw_salt(context, princ->entry.principal, &def_salt); 176 if (ret) 177 return ret; 178 179 ret = KRB5KDC_ERR_ETYPE_NOSUPP; 180 181 if (use_strongest_session_key) { 182 183 /* 184 * Pick the strongest key that the KDC, target service, and 185 * client all support, using the local cryptosystem enctype 186 * list in strongest-to-weakest order to drive the search. 187 * 188 * This is not what RFC4120 says to do, but it encourages 189 * adoption of stronger enctypes. This doesn't play well with 190 * clients that have multiple Kerberos client implementations 191 * available with different supported enctype lists. 192 */ 193 194 /* drive the search with local supported enctypes list */ 195 p = krb5_kerberos_enctypes(context); 196 for (i = 0; 197 p[i] != (krb5_enctype)ETYPE_NULL && enctype == (krb5_enctype)ETYPE_NULL; 198 i++) { 199 if (krb5_enctype_valid(context, p[i]) != 0 && 200 !_kdc_is_weak_exception(princ->entry.principal, p[i])) 201 continue; 202 203 /* check that the client supports it too */ 204 for (k = 0; k < len && enctype == (krb5_enctype)ETYPE_NULL; k++) { 205 206 if (p[i] != etypes[k]) 207 continue; 208 209 /* check target princ support */ 210 key = NULL; 211 while (hdb_next_enctype2key(context, &princ->entry, NULL, 212 p[i], &key) == 0) { 213 if (key->key.keyvalue.length == 0) { 214 ret = KRB5KDC_ERR_NULL_KEY; 215 continue; 216 } 217 enctype = p[i]; 218 ret = 0; 219 if (is_preauth && ret_key != NULL && 220 !is_good_salt_p(&def_salt, key)) 221 continue; 222 } 223 } 224 } 225 } else { 226 /* 227 * Pick the first key from the client's enctype list that is 228 * supported by the cryptosystem and by the given principal. 229 * 230 * RFC4120 says we SHOULD pick the first _strong_ key from the 231 * client's list... not the first key... If the admin disallows 232 * weak enctypes in krb5.conf and selects this key selection 233 * algorithm, then we get exactly what RFC4120 says. 234 */ 235 for(i = 0; ret != 0 && i < len; i++) { 236 237 if (krb5_enctype_valid(context, etypes[i]) != 0 && 238 !_kdc_is_weak_exception(princ->entry.principal, etypes[i])) 239 continue; 240 241 key = NULL; 242 while (ret != 0 && 243 hdb_next_enctype2key(context, &princ->entry, NULL, 244 etypes[i], &key) == 0) { 245 if (key->key.keyvalue.length == 0) { 246 ret = KRB5KDC_ERR_NULL_KEY; 247 continue; 248 } 249 enctype = etypes[i]; 250 ret = 0; 251 if (is_preauth && ret_key != NULL && 252 !is_good_salt_p(&def_salt, key)) 253 continue; 254 } 255 } 256 } 257 258 if (enctype == (krb5_enctype)ETYPE_NULL) { 259 /* 260 * if the service principal is one for which there is a known 1DES 261 * exception and no other enctype matches both the client request and 262 * the service key list, provide a DES-CBC-CRC key. 263 */ 264 if (ret_key == NULL && 265 _kdc_is_weak_exception(princ->entry.principal, ETYPE_DES_CBC_CRC)) { 266 ret = 0; 267 enctype = ETYPE_DES_CBC_CRC; 268 } else { 269 ret = KRB5KDC_ERR_ETYPE_NOSUPP; 270 } 271 } 272 273 if (ret == 0) { 274 if (ret_enctype != NULL) 275 *ret_enctype = enctype; 276 if (ret_key != NULL) 277 *ret_key = key; 278 } 279 280 krb5_free_salt (context, def_salt); 281 return ret; 282 } 283 284 krb5_error_code 285 _kdc_make_anonymous_principalname (PrincipalName *pn) 286 { 287 pn->name_type = KRB5_NT_WELLKNOWN; 288 pn->name_string.len = 2; 289 pn->name_string.val = calloc(2, sizeof(*pn->name_string.val)); 290 if (pn->name_string.val == NULL) 291 goto failed; 292 293 pn->name_string.val[0] = strdup(KRB5_WELLKNOWN_NAME); 294 if (pn->name_string.val[0] == NULL) 295 goto failed; 296 297 pn->name_string.val[1] = strdup(KRB5_ANON_NAME); 298 if (pn->name_string.val[1] == NULL) 299 goto failed; 300 301 return 0; 302 303 failed: 304 free_PrincipalName(pn); 305 306 pn->name_type = KRB5_NT_UNKNOWN; 307 pn->name_string.len = 0; 308 pn->name_string.val = NULL; 309 310 return ENOMEM; 311 } 312 313 static void 314 _kdc_r_log(kdc_request_t r, int level, const char *fmt, ...) 315 { 316 va_list ap; 317 char *s; 318 va_start(ap, fmt); 319 s = kdc_log_msg_va(r->context, r->config, level, fmt, ap); 320 if(s) free(s); 321 va_end(ap); 322 } 323 324 static void 325 _kdc_set_e_text(kdc_request_t r, const char *e_text) 326 { 327 r->e_text = e_text; 328 kdc_log(r->context, r->config, 0, "%s", e_text); 329 } 330 331 void 332 _kdc_log_timestamp(krb5_context context, 333 krb5_kdc_configuration *config, 334 const char *type, 335 KerberosTime authtime, KerberosTime *starttime, 336 KerberosTime endtime, KerberosTime *renew_till) 337 { 338 char authtime_str[100], starttime_str[100], 339 endtime_str[100], renewtime_str[100]; 340 341 krb5_format_time(context, authtime, 342 authtime_str, sizeof(authtime_str), TRUE); 343 if (starttime) 344 krb5_format_time(context, *starttime, 345 starttime_str, sizeof(starttime_str), TRUE); 346 else 347 strlcpy(starttime_str, "unset", sizeof(starttime_str)); 348 krb5_format_time(context, endtime, 349 endtime_str, sizeof(endtime_str), TRUE); 350 if (renew_till) 351 krb5_format_time(context, *renew_till, 352 renewtime_str, sizeof(renewtime_str), TRUE); 353 else 354 strlcpy(renewtime_str, "unset", sizeof(renewtime_str)); 355 356 kdc_log(context, config, 5, 357 "%s authtime: %s starttime: %s endtime: %s renew till: %s", 358 type, authtime_str, starttime_str, endtime_str, renewtime_str); 359 } 360 361 /* 362 * 363 */ 364 365 #ifdef PKINIT 366 367 static krb5_error_code 368 pa_pkinit_validate(kdc_request_t r, const PA_DATA *pa) 369 { 370 pk_client_params *pkp = NULL; 371 char *client_cert = NULL; 372 krb5_error_code ret; 373 374 ret = _kdc_pk_rd_padata(r->context, r->config, &r->req, pa, r->client, &pkp); 375 if (ret || pkp == NULL) { 376 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 377 _kdc_r_log(r, 5, "Failed to decode PKINIT PA-DATA -- %s", 378 r->client_name); 379 goto out; 380 } 381 382 ret = _kdc_pk_check_client(r->context, 383 r->config, 384 r->clientdb, 385 r->client, 386 pkp, 387 &client_cert); 388 if (ret) { 389 _kdc_set_e_text(r, "PKINIT certificate not allowed to " 390 "impersonate principal"); 391 goto out; 392 } 393 394 _kdc_r_log(r, 0, "PKINIT pre-authentication succeeded -- %s using %s", 395 r->client_name, client_cert); 396 free(client_cert); 397 398 ret = _kdc_pk_mk_pa_reply(r->context, r->config, pkp, r->client, 399 r->sessionetype, &r->req, &r->request, 400 &r->reply_key, &r->session_key, &r->outpadata); 401 if (ret) { 402 _kdc_set_e_text(r, "Failed to build PK-INIT reply"); 403 goto out; 404 } 405 #if 0 406 ret = _kdc_add_inital_verified_cas(r->context, r->config, 407 pkp, &r->et); 408 #endif 409 out: 410 if (pkp) 411 _kdc_pk_free_client_param(r->context, pkp); 412 413 return ret; 414 } 415 416 #endif /* PKINIT */ 417 418 /* 419 * 420 */ 421 422 static krb5_error_code 423 make_pa_enc_challange(krb5_context context, METHOD_DATA *md, 424 krb5_crypto crypto) 425 { 426 PA_ENC_TS_ENC p; 427 unsigned char *buf; 428 size_t buf_size; 429 size_t len; 430 EncryptedData encdata; 431 krb5_error_code ret; 432 int32_t usec; 433 int usec2; 434 435 krb5_us_timeofday (context, &p.patimestamp, &usec); 436 usec2 = usec; 437 p.pausec = &usec2; 438 439 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret); 440 if (ret) 441 return ret; 442 if(buf_size != len) 443 krb5_abortx(context, "internal error in ASN.1 encoder"); 444 445 ret = krb5_encrypt_EncryptedData(context, 446 crypto, 447 KRB5_KU_ENC_CHALLENGE_KDC, 448 buf, 449 len, 450 0, 451 &encdata); 452 free(buf); 453 if (ret) 454 return ret; 455 456 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret); 457 free_EncryptedData(&encdata); 458 if (ret) 459 return ret; 460 if(buf_size != len) 461 krb5_abortx(context, "internal error in ASN.1 encoder"); 462 463 ret = krb5_padata_add(context, md, KRB5_PADATA_ENCRYPTED_CHALLENGE, buf, len); 464 if (ret) 465 free(buf); 466 return ret; 467 } 468 469 static krb5_error_code 470 pa_enc_chal_validate(kdc_request_t r, const PA_DATA *pa) 471 { 472 krb5_data pepper1, pepper2, ts_data; 473 int invalidPassword = 0; 474 EncryptedData enc_data; 475 krb5_enctype aenctype; 476 krb5_error_code ret; 477 struct Key *k; 478 size_t size; 479 int i; 480 481 heim_assert(r->armor_crypto != NULL, "ENC-CHAL called for non FAST"); 482 483 if (_kdc_is_anon_request(&r->req)) { 484 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 485 kdc_log(r->context, r->config, 0, "ENC-CHALL doesn't support anon"); 486 return ret; 487 } 488 489 ret = decode_EncryptedData(pa->padata_value.data, 490 pa->padata_value.length, 491 &enc_data, 492 &size); 493 if (ret) { 494 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 495 _kdc_r_log(r, 5, "Failed to decode PA-DATA -- %s", 496 r->client_name); 497 return ret; 498 } 499 500 pepper1.data = "clientchallengearmor"; 501 pepper1.length = strlen(pepper1.data); 502 pepper2.data = "challengelongterm"; 503 pepper2.length = strlen(pepper2.data); 504 505 krb5_crypto_getenctype(r->context, r->armor_crypto, &aenctype); 506 507 for (i = 0; i < r->client->entry.keys.len; i++) { 508 krb5_crypto challangecrypto, longtermcrypto; 509 krb5_keyblock challangekey; 510 PA_ENC_TS_ENC p; 511 512 k = &r->client->entry.keys.val[i]; 513 514 ret = krb5_crypto_init(r->context, &k->key, 0, &longtermcrypto); 515 if (ret) 516 continue; 517 518 ret = krb5_crypto_fx_cf2(r->context, r->armor_crypto, longtermcrypto, 519 &pepper1, &pepper2, aenctype, 520 &challangekey); 521 krb5_crypto_destroy(r->context, longtermcrypto); 522 if (ret) 523 continue; 524 525 ret = krb5_crypto_init(r->context, &challangekey, 0, 526 &challangecrypto); 527 if (ret) 528 continue; 529 530 ret = krb5_decrypt_EncryptedData(r->context, challangecrypto, 531 KRB5_KU_ENC_CHALLENGE_CLIENT, 532 &enc_data, 533 &ts_data); 534 if (ret) { 535 const char *msg = krb5_get_error_message(r->context, ret); 536 krb5_error_code ret2; 537 char *str = NULL; 538 539 invalidPassword = 1; 540 541 ret2 = krb5_enctype_to_string(r->context, k->key.keytype, &str); 542 if (ret2) 543 str = NULL; 544 _kdc_r_log(r, 5, "Failed to decrypt ENC-CHAL -- %s " 545 "(enctype %s) error %s", 546 r->client_name, str ? str : "unknown enctype", msg); 547 krb5_free_error_message(r->context, msg); 548 free(str); 549 550 continue; 551 } 552 553 ret = decode_PA_ENC_TS_ENC(ts_data.data, 554 ts_data.length, 555 &p, 556 &size); 557 krb5_data_free(&ts_data); 558 if(ret){ 559 krb5_crypto_destroy(r->context, challangecrypto); 560 ret = KRB5KDC_ERR_PREAUTH_FAILED; 561 _kdc_r_log(r, 5, "Failed to decode PA-ENC-TS_ENC -- %s", 562 r->client_name); 563 continue; 564 } 565 566 if (labs(kdc_time - p.patimestamp) > r->context->max_skew) { 567 char client_time[100]; 568 569 krb5_crypto_destroy(r->context, challangecrypto); 570 571 krb5_format_time(r->context, p.patimestamp, 572 client_time, sizeof(client_time), TRUE); 573 574 ret = KRB5KRB_AP_ERR_SKEW; 575 _kdc_r_log(r, 0, "Too large time skew, " 576 "client time %s is out by %u > %u seconds -- %s", 577 client_time, 578 (unsigned)labs(kdc_time - p.patimestamp), 579 r->context->max_skew, 580 r->client_name); 581 582 free_PA_ENC_TS_ENC(&p); 583 goto out; 584 } 585 586 free_PA_ENC_TS_ENC(&p); 587 588 ret = make_pa_enc_challange(r->context, &r->outpadata, 589 challangecrypto); 590 krb5_crypto_destroy(r->context, challangecrypto); 591 if (ret) 592 goto out; 593 594 set_salt_padata(&r->outpadata, k->salt); 595 krb5_free_keyblock_contents(r->context, &r->reply_key); 596 ret = krb5_copy_keyblock_contents(r->context, &k->key, &r->reply_key); 597 if (ret) 598 goto out; 599 600 /* 601 * Success 602 */ 603 if (r->clientdb->hdb_auth_status) 604 r->clientdb->hdb_auth_status(r->context, r->clientdb, r->client, 605 HDB_AUTH_SUCCESS); 606 goto out; 607 } 608 609 if (invalidPassword && r->clientdb->hdb_auth_status) { 610 r->clientdb->hdb_auth_status(r->context, r->clientdb, r->client, 611 HDB_AUTH_WRONG_PASSWORD); 612 ret = KRB5KDC_ERR_PREAUTH_FAILED; 613 } 614 out: 615 free_EncryptedData(&enc_data); 616 617 return ret; 618 } 619 620 static krb5_error_code 621 pa_enc_ts_validate(kdc_request_t r, const PA_DATA *pa) 622 { 623 EncryptedData enc_data; 624 krb5_error_code ret; 625 krb5_crypto crypto; 626 krb5_data ts_data; 627 PA_ENC_TS_ENC p; 628 size_t len; 629 Key *pa_key; 630 char *str; 631 632 ret = decode_EncryptedData(pa->padata_value.data, 633 pa->padata_value.length, 634 &enc_data, 635 &len); 636 if (ret) { 637 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 638 _kdc_r_log(r, 5, "Failed to decode PA-DATA -- %s", 639 r->client_name); 640 goto out; 641 } 642 643 ret = hdb_enctype2key(r->context, &r->client->entry, NULL, 644 enc_data.etype, &pa_key); 645 if(ret){ 646 char *estr; 647 _kdc_set_e_text(r, "No key matching entype"); 648 ret = KRB5KDC_ERR_ETYPE_NOSUPP; 649 if(krb5_enctype_to_string(r->context, enc_data.etype, &estr)) 650 estr = NULL; 651 if(estr == NULL) 652 _kdc_r_log(r, 5, 653 "No client key matching pa-data (%d) -- %s", 654 enc_data.etype, r->client_name); 655 else 656 _kdc_r_log(r, 5, 657 "No client key matching pa-data (%s) -- %s", 658 estr, r->client_name); 659 free(estr); 660 free_EncryptedData(&enc_data); 661 goto out; 662 } 663 664 try_next_key: 665 ret = krb5_crypto_init(r->context, &pa_key->key, 0, &crypto); 666 if (ret) { 667 const char *msg = krb5_get_error_message(r->context, ret); 668 _kdc_r_log(r, 0, "krb5_crypto_init failed: %s", msg); 669 krb5_free_error_message(r->context, msg); 670 free_EncryptedData(&enc_data); 671 goto out; 672 } 673 674 ret = krb5_decrypt_EncryptedData (r->context, 675 crypto, 676 KRB5_KU_PA_ENC_TIMESTAMP, 677 &enc_data, 678 &ts_data); 679 krb5_crypto_destroy(r->context, crypto); 680 /* 681 * Since the user might have several keys with the same 682 * enctype but with diffrent salting, we need to try all 683 * the keys with the same enctype. 684 */ 685 if(ret){ 686 krb5_error_code ret2; 687 const char *msg = krb5_get_error_message(r->context, ret); 688 689 ret2 = krb5_enctype_to_string(r->context, 690 pa_key->key.keytype, &str); 691 if (ret2) 692 str = NULL; 693 _kdc_r_log(r, 5, "Failed to decrypt PA-DATA -- %s " 694 "(enctype %s) error %s", 695 r->client_name, str ? str : "unknown enctype", msg); 696 krb5_free_error_message(r->context, msg); 697 free(str); 698 699 if(hdb_next_enctype2key(r->context, &r->client->entry, NULL, 700 enc_data.etype, &pa_key) == 0) 701 goto try_next_key; 702 703 free_EncryptedData(&enc_data); 704 705 if (r->clientdb->hdb_auth_status) 706 r->clientdb->hdb_auth_status(r->context, r->clientdb, r->client, 707 HDB_AUTH_WRONG_PASSWORD); 708 709 ret = KRB5KDC_ERR_PREAUTH_FAILED; 710 goto out; 711 } 712 free_EncryptedData(&enc_data); 713 ret = decode_PA_ENC_TS_ENC(ts_data.data, 714 ts_data.length, 715 &p, 716 &len); 717 krb5_data_free(&ts_data); 718 if(ret){ 719 ret = KRB5KDC_ERR_PREAUTH_FAILED; 720 _kdc_r_log(r, 5, "Failed to decode PA-ENC-TS_ENC -- %s", 721 r->client_name); 722 goto out; 723 } 724 if (labs(kdc_time - p.patimestamp) > r->context->max_skew) { 725 char client_time[100]; 726 727 krb5_format_time(r->context, p.patimestamp, 728 client_time, sizeof(client_time), TRUE); 729 730 ret = KRB5KRB_AP_ERR_SKEW; 731 _kdc_r_log(r, 0, "Too large time skew, " 732 "client time %s is out by %u > %u seconds -- %s", 733 client_time, 734 (unsigned)labs(kdc_time - p.patimestamp), 735 r->context->max_skew, 736 r->client_name); 737 738 /* 739 * The following is needed to make windows clients to 740 * retry using the timestamp in the error message, if 741 * there is a e_text, they become unhappy. 742 */ 743 r->e_text = NULL; 744 free_PA_ENC_TS_ENC(&p); 745 goto out; 746 } 747 free_PA_ENC_TS_ENC(&p); 748 749 set_salt_padata(&r->outpadata, pa_key->salt); 750 751 ret = krb5_copy_keyblock_contents(r->context, &pa_key->key, &r->reply_key); 752 if (ret) 753 return ret; 754 755 ret = krb5_enctype_to_string(r->context, pa_key->key.keytype, &str); 756 if (ret) 757 str = NULL; 758 _kdc_r_log(r, 2, "ENC-TS Pre-authentication succeeded -- %s using %s", 759 r->client_name, str ? str : "unknown enctype"); 760 free(str); 761 762 ret = 0; 763 764 out: 765 766 return ret; 767 } 768 769 struct kdc_patypes { 770 int type; 771 char *name; 772 unsigned int flags; 773 #define PA_ANNOUNCE 1 774 #define PA_REQ_FAST 2 /* only use inside fast */ 775 krb5_error_code (*validate)(kdc_request_t, const PA_DATA *pa); 776 }; 777 778 static const struct kdc_patypes pat[] = { 779 #ifdef PKINIT 780 { 781 KRB5_PADATA_PK_AS_REQ, "PK-INIT(ietf)", PA_ANNOUNCE, 782 pa_pkinit_validate 783 }, 784 { 785 KRB5_PADATA_PK_AS_REQ_WIN, "PK-INIT(win2k)", PA_ANNOUNCE, 786 pa_pkinit_validate 787 }, 788 { 789 KRB5_PADATA_PKINIT_KX, "Anonymous PK-INIT", PA_ANNOUNCE, 790 NULL 791 }, 792 #else 793 { KRB5_PADATA_PK_AS_REQ, "PK-INIT(ietf)", 0, NULL }, 794 { KRB5_PADATA_PK_AS_REQ_WIN, "PK-INIT(win2k)", 0, NULL }, 795 { KRB5_PADATA_PKINIT_KX, "Anonymous PK-INIT", 0, NULL }, 796 #endif 797 { KRB5_PADATA_PA_PK_OCSP_RESPONSE , "OCSP", 0, NULL }, 798 { 799 KRB5_PADATA_ENC_TIMESTAMP , "ENC-TS", 800 PA_ANNOUNCE, 801 pa_enc_ts_validate 802 }, 803 { 804 KRB5_PADATA_ENCRYPTED_CHALLENGE , "ENC-CHAL", 805 PA_ANNOUNCE | PA_REQ_FAST, 806 pa_enc_chal_validate 807 }, 808 { KRB5_PADATA_REQ_ENC_PA_REP , "REQ-ENC-PA-REP", 0, NULL }, 809 { KRB5_PADATA_FX_FAST, "FX-FAST", PA_ANNOUNCE, NULL }, 810 { KRB5_PADATA_FX_ERROR, "FX-ERROR", 0, NULL }, 811 { KRB5_PADATA_FX_COOKIE, "FX-COOKIE", 0, NULL } 812 }; 813 814 static void 815 log_patypes(krb5_context context, 816 krb5_kdc_configuration *config, 817 METHOD_DATA *padata) 818 { 819 struct rk_strpool *p = NULL; 820 char *str; 821 size_t n, m; 822 823 for (n = 0; n < padata->len; n++) { 824 for (m = 0; m < sizeof(pat) / sizeof(pat[0]); m++) { 825 if (padata->val[n].padata_type == pat[m].type) { 826 p = rk_strpoolprintf(p, "%s", pat[m].name); 827 break; 828 } 829 } 830 if (m == sizeof(pat) / sizeof(pat[0])) 831 p = rk_strpoolprintf(p, "%d", padata->val[n].padata_type); 832 if (p && n + 1 < padata->len) 833 p = rk_strpoolprintf(p, ", "); 834 if (p == NULL) { 835 kdc_log(context, config, 0, "out of memory"); 836 return; 837 } 838 } 839 if (p == NULL) 840 p = rk_strpoolprintf(p, "none"); 841 842 str = rk_strpoolcollect(p); 843 kdc_log(context, config, 0, "Client sent patypes: %s", str); 844 free(str); 845 } 846 847 /* 848 * 849 */ 850 851 krb5_error_code 852 _kdc_encode_reply(krb5_context context, 853 krb5_kdc_configuration *config, 854 krb5_crypto armor_crypto, uint32_t nonce, 855 KDC_REP *rep, EncTicketPart *et, EncKDCRepPart *ek, 856 krb5_enctype etype, 857 int skvno, const EncryptionKey *skey, 858 int ckvno, const EncryptionKey *reply_key, 859 int rk_is_subkey, 860 const char **e_text, 861 krb5_data *reply) 862 { 863 unsigned char *buf; 864 size_t buf_size; 865 size_t len = 0; 866 krb5_error_code ret; 867 krb5_crypto crypto; 868 869 ASN1_MALLOC_ENCODE(EncTicketPart, buf, buf_size, et, &len, ret); 870 if(ret) { 871 const char *msg = krb5_get_error_message(context, ret); 872 kdc_log(context, config, 0, "Failed to encode ticket: %s", msg); 873 krb5_free_error_message(context, msg); 874 return ret; 875 } 876 if(buf_size != len) 877 krb5_abortx(context, "Internal error in ASN.1 encoder"); 878 879 ret = krb5_crypto_init(context, skey, etype, &crypto); 880 if (ret) { 881 const char *msg = krb5_get_error_message(context, ret); 882 kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg); 883 krb5_free_error_message(context, msg); 884 free(buf); 885 return ret; 886 } 887 888 ret = krb5_encrypt_EncryptedData(context, 889 crypto, 890 KRB5_KU_TICKET, 891 buf, 892 len, 893 skvno, 894 &rep->ticket.enc_part); 895 free(buf); 896 krb5_crypto_destroy(context, crypto); 897 if(ret) { 898 const char *msg = krb5_get_error_message(context, ret); 899 kdc_log(context, config, 0, "Failed to encrypt data: %s", msg); 900 krb5_free_error_message(context, msg); 901 return ret; 902 } 903 904 if (armor_crypto) { 905 krb5_data data; 906 krb5_keyblock *strengthen_key = NULL; 907 KrbFastFinished finished; 908 909 kdc_log(context, config, 0, "FAST armor protection"); 910 911 memset(&finished, 0, sizeof(finished)); 912 krb5_data_zero(&data); 913 914 finished.timestamp = kdc_time; 915 finished.usec = 0; 916 finished.crealm = et->crealm; 917 finished.cname = et->cname; 918 919 ASN1_MALLOC_ENCODE(Ticket, data.data, data.length, 920 &rep->ticket, &len, ret); 921 if (ret) 922 return ret; 923 if (data.length != len) 924 krb5_abortx(context, "internal asn.1 error"); 925 926 ret = krb5_create_checksum(context, armor_crypto, 927 KRB5_KU_FAST_FINISHED, 0, 928 data.data, data.length, 929 &finished.ticket_checksum); 930 krb5_data_free(&data); 931 if (ret) 932 return ret; 933 934 ret = _kdc_fast_mk_response(context, armor_crypto, 935 rep->padata, strengthen_key, &finished, 936 nonce, &data); 937 free_Checksum(&finished.ticket_checksum); 938 if (ret) 939 return ret; 940 941 if (rep->padata) { 942 free_METHOD_DATA(rep->padata); 943 } else { 944 rep->padata = calloc(1, sizeof(*(rep->padata))); 945 if (rep->padata == NULL) { 946 krb5_data_free(&data); 947 return ENOMEM; 948 } 949 } 950 951 ret = krb5_padata_add(context, rep->padata, 952 KRB5_PADATA_FX_FAST, 953 data.data, data.length); 954 if (ret) 955 return ret; 956 957 /* 958 * Hide client name of privacy reasons 959 */ 960 if (1 /* r->fast_options.hide_client_names */) { 961 rep->crealm[0] = '\0'; 962 free_PrincipalName(&rep->cname); 963 rep->cname.name_type = 0; 964 } 965 } 966 967 if(rep->msg_type == krb_as_rep && !config->encode_as_rep_as_tgs_rep) 968 ASN1_MALLOC_ENCODE(EncASRepPart, buf, buf_size, ek, &len, ret); 969 else 970 ASN1_MALLOC_ENCODE(EncTGSRepPart, buf, buf_size, ek, &len, ret); 971 if(ret) { 972 const char *msg = krb5_get_error_message(context, ret); 973 kdc_log(context, config, 0, "Failed to encode KDC-REP: %s", msg); 974 krb5_free_error_message(context, msg); 975 return ret; 976 } 977 if(buf_size != len) { 978 free(buf); 979 kdc_log(context, config, 0, "Internal error in ASN.1 encoder"); 980 *e_text = "KDC internal error"; 981 return KRB5KRB_ERR_GENERIC; 982 } 983 ret = krb5_crypto_init(context, reply_key, 0, &crypto); 984 if (ret) { 985 const char *msg = krb5_get_error_message(context, ret); 986 free(buf); 987 kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg); 988 krb5_free_error_message(context, msg); 989 return ret; 990 } 991 if(rep->msg_type == krb_as_rep) { 992 krb5_encrypt_EncryptedData(context, 993 crypto, 994 KRB5_KU_AS_REP_ENC_PART, 995 buf, 996 len, 997 ckvno, 998 &rep->enc_part); 999 free(buf); 1000 ASN1_MALLOC_ENCODE(AS_REP, buf, buf_size, rep, &len, ret); 1001 } else { 1002 krb5_encrypt_EncryptedData(context, 1003 crypto, 1004 rk_is_subkey ? KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : KRB5_KU_TGS_REP_ENC_PART_SESSION, 1005 buf, 1006 len, 1007 ckvno, 1008 &rep->enc_part); 1009 free(buf); 1010 ASN1_MALLOC_ENCODE(TGS_REP, buf, buf_size, rep, &len, ret); 1011 } 1012 krb5_crypto_destroy(context, crypto); 1013 if(ret) { 1014 const char *msg = krb5_get_error_message(context, ret); 1015 kdc_log(context, config, 0, "Failed to encode KDC-REP: %s", msg); 1016 krb5_free_error_message(context, msg); 1017 return ret; 1018 } 1019 if(buf_size != len) { 1020 free(buf); 1021 kdc_log(context, config, 0, "Internal error in ASN.1 encoder"); 1022 *e_text = "KDC internal error"; 1023 return KRB5KRB_ERR_GENERIC; 1024 } 1025 reply->data = buf; 1026 reply->length = buf_size; 1027 return 0; 1028 } 1029 1030 /* 1031 * Return 1 if the client have only older enctypes, this is for 1032 * determining if the server should send ETYPE_INFO2 or not. 1033 */ 1034 1035 static int 1036 older_enctype(krb5_enctype enctype) 1037 { 1038 switch (enctype) { 1039 case ETYPE_DES_CBC_CRC: 1040 case ETYPE_DES_CBC_MD4: 1041 case ETYPE_DES_CBC_MD5: 1042 case ETYPE_DES3_CBC_SHA1: 1043 case ETYPE_ARCFOUR_HMAC_MD5: 1044 case ETYPE_ARCFOUR_HMAC_MD5_56: 1045 /* 1046 * The following three is "old" windows enctypes and is needed for 1047 * windows 2000 hosts. 1048 */ 1049 case ETYPE_ARCFOUR_MD4: 1050 case ETYPE_ARCFOUR_HMAC_OLD: 1051 case ETYPE_ARCFOUR_HMAC_OLD_EXP: 1052 return 1; 1053 default: 1054 return 0; 1055 } 1056 } 1057 1058 /* 1059 * 1060 */ 1061 1062 static krb5_error_code 1063 make_etype_info_entry(krb5_context context, ETYPE_INFO_ENTRY *ent, Key *key) 1064 { 1065 ent->etype = key->key.keytype; 1066 if(key->salt){ 1067 #if 0 1068 ALLOC(ent->salttype); 1069 1070 if(key->salt->type == hdb_pw_salt) 1071 *ent->salttype = 0; /* or 1? or NULL? */ 1072 else if(key->salt->type == hdb_afs3_salt) 1073 *ent->salttype = 2; 1074 else { 1075 kdc_log(context, config, 0, "unknown salt-type: %d", 1076 key->salt->type); 1077 return KRB5KRB_ERR_GENERIC; 1078 } 1079 /* according to `the specs', we can't send a salt if 1080 we have AFS3 salted key, but that requires that you 1081 *know* what cell you are using (e.g by assuming 1082 that the cell is the same as the realm in lower 1083 case) */ 1084 #elif 0 1085 ALLOC(ent->salttype); 1086 *ent->salttype = key->salt->type; 1087 #else 1088 /* 1089 * We shouldn't sent salttype since it is incompatible with the 1090 * specification and it breaks windows clients. The afs 1091 * salting problem is solved by using KRB5-PADATA-AFS3-SALT 1092 * implemented in Heimdal 0.7 and later. 1093 */ 1094 ent->salttype = NULL; 1095 #endif 1096 krb5_copy_data(context, &key->salt->salt, 1097 &ent->salt); 1098 } else { 1099 /* we return no salt type at all, as that should indicate 1100 * the default salt type and make everybody happy. some 1101 * systems (like w2k) dislike being told the salt type 1102 * here. */ 1103 1104 ent->salttype = NULL; 1105 ent->salt = NULL; 1106 } 1107 return 0; 1108 } 1109 1110 static krb5_error_code 1111 get_pa_etype_info(krb5_context context, 1112 krb5_kdc_configuration *config, 1113 METHOD_DATA *md, Key *ckey) 1114 { 1115 krb5_error_code ret = 0; 1116 ETYPE_INFO pa; 1117 unsigned char *buf; 1118 size_t len; 1119 1120 1121 pa.len = 1; 1122 pa.val = calloc(1, sizeof(pa.val[0])); 1123 if(pa.val == NULL) 1124 return ENOMEM; 1125 1126 ret = make_etype_info_entry(context, &pa.val[0], ckey); 1127 if (ret) { 1128 free_ETYPE_INFO(&pa); 1129 return ret; 1130 } 1131 1132 ASN1_MALLOC_ENCODE(ETYPE_INFO, buf, len, &pa, &len, ret); 1133 free_ETYPE_INFO(&pa); 1134 if(ret) 1135 return ret; 1136 ret = realloc_method_data(md); 1137 if(ret) { 1138 free(buf); 1139 return ret; 1140 } 1141 md->val[md->len - 1].padata_type = KRB5_PADATA_ETYPE_INFO; 1142 md->val[md->len - 1].padata_value.length = len; 1143 md->val[md->len - 1].padata_value.data = buf; 1144 return 0; 1145 } 1146 1147 /* 1148 * 1149 */ 1150 1151 extern int _krb5_AES_SHA1_string_to_default_iterator; 1152 extern int _krb5_AES_SHA2_string_to_default_iterator; 1153 1154 static krb5_error_code 1155 make_s2kparams(int value, size_t len, krb5_data **ps2kparams) 1156 { 1157 krb5_data *s2kparams; 1158 krb5_error_code ret; 1159 1160 ALLOC(s2kparams); 1161 if (s2kparams == NULL) 1162 return ENOMEM; 1163 ret = krb5_data_alloc(s2kparams, len); 1164 if (ret) { 1165 free(s2kparams); 1166 return ret; 1167 } 1168 _krb5_put_int(s2kparams->data, value, len); 1169 *ps2kparams = s2kparams; 1170 return 0; 1171 } 1172 1173 static krb5_error_code 1174 make_etype_info2_entry(ETYPE_INFO2_ENTRY *ent, Key *key) 1175 { 1176 krb5_error_code ret; 1177 1178 ent->etype = key->key.keytype; 1179 if(key->salt) { 1180 ALLOC(ent->salt); 1181 if (ent->salt == NULL) 1182 return ENOMEM; 1183 *ent->salt = malloc(key->salt->salt.length + 1); 1184 if (*ent->salt == NULL) { 1185 free(ent->salt); 1186 ent->salt = NULL; 1187 return ENOMEM; 1188 } 1189 memcpy(*ent->salt, key->salt->salt.data, key->salt->salt.length); 1190 (*ent->salt)[key->salt->salt.length] = '\0'; 1191 } else 1192 ent->salt = NULL; 1193 1194 ent->s2kparams = NULL; 1195 1196 switch (key->key.keytype) { 1197 case ETYPE_AES128_CTS_HMAC_SHA1_96: 1198 case ETYPE_AES256_CTS_HMAC_SHA1_96: 1199 ret = make_s2kparams(_krb5_AES_SHA1_string_to_default_iterator, 1200 4, &ent->s2kparams); 1201 break; 1202 case KRB5_ENCTYPE_AES128_CTS_HMAC_SHA256_128: 1203 case KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192: 1204 ret = make_s2kparams(_krb5_AES_SHA2_string_to_default_iterator, 1205 4, &ent->s2kparams); 1206 break; 1207 case ETYPE_DES_CBC_CRC: 1208 case ETYPE_DES_CBC_MD4: 1209 case ETYPE_DES_CBC_MD5: 1210 /* Check if this was a AFS3 salted key */ 1211 if(key->salt && key->salt->type == hdb_afs3_salt) 1212 ret = make_s2kparams(1, 1, &ent->s2kparams); 1213 else 1214 ret = 0; 1215 break; 1216 default: 1217 ret = 0; 1218 break; 1219 } 1220 return ret; 1221 } 1222 1223 /* 1224 * Return an ETYPE-INFO2. Enctypes are storted the same way as in the 1225 * database (client supported enctypes first, then the unsupported 1226 * enctypes). 1227 */ 1228 1229 static krb5_error_code 1230 get_pa_etype_info2(krb5_context context, 1231 krb5_kdc_configuration *config, 1232 METHOD_DATA *md, Key *ckey) 1233 { 1234 krb5_error_code ret = 0; 1235 ETYPE_INFO2 pa; 1236 unsigned char *buf; 1237 size_t len; 1238 1239 pa.len = 1; 1240 pa.val = calloc(1, sizeof(pa.val[0])); 1241 if(pa.val == NULL) 1242 return ENOMEM; 1243 1244 ret = make_etype_info2_entry(&pa.val[0], ckey); 1245 if (ret) { 1246 free_ETYPE_INFO2(&pa); 1247 return ret; 1248 } 1249 1250 ASN1_MALLOC_ENCODE(ETYPE_INFO2, buf, len, &pa, &len, ret); 1251 free_ETYPE_INFO2(&pa); 1252 if(ret) 1253 return ret; 1254 ret = realloc_method_data(md); 1255 if(ret) { 1256 free(buf); 1257 return ret; 1258 } 1259 md->val[md->len - 1].padata_type = KRB5_PADATA_ETYPE_INFO2; 1260 md->val[md->len - 1].padata_value.length = len; 1261 md->val[md->len - 1].padata_value.data = buf; 1262 return 0; 1263 } 1264 1265 /* 1266 * 1267 */ 1268 1269 static void 1270 log_as_req(krb5_context context, 1271 krb5_kdc_configuration *config, 1272 krb5_enctype cetype, 1273 krb5_enctype setype, 1274 const KDC_REQ_BODY *b) 1275 { 1276 krb5_error_code ret; 1277 struct rk_strpool *p; 1278 char *str; 1279 size_t i; 1280 1281 p = rk_strpoolprintf(NULL, "%s", "Client supported enctypes: "); 1282 1283 for (i = 0; i < b->etype.len; i++) { 1284 ret = krb5_enctype_to_string(context, b->etype.val[i], &str); 1285 if (ret == 0) { 1286 p = rk_strpoolprintf(p, "%s", str); 1287 free(str); 1288 } else 1289 p = rk_strpoolprintf(p, "%d", b->etype.val[i]); 1290 if (p && i + 1 < b->etype.len) 1291 p = rk_strpoolprintf(p, ", "); 1292 if (p == NULL) { 1293 kdc_log(context, config, 0, "out of memory"); 1294 return; 1295 } 1296 } 1297 if (p == NULL) 1298 p = rk_strpoolprintf(p, "no encryption types"); 1299 1300 { 1301 char *cet; 1302 char *set; 1303 1304 ret = krb5_enctype_to_string(context, cetype, &cet); 1305 if(ret == 0) { 1306 ret = krb5_enctype_to_string(context, setype, &set); 1307 if (ret == 0) { 1308 p = rk_strpoolprintf(p, ", using %s/%s", cet, set); 1309 free(set); 1310 } 1311 free(cet); 1312 } 1313 if (ret != 0) 1314 p = rk_strpoolprintf(p, ", using enctypes %d/%d", 1315 cetype, setype); 1316 } 1317 1318 str = rk_strpoolcollect(p); 1319 kdc_log(context, config, 0, "%s", str); 1320 free(str); 1321 1322 { 1323 char fixedstr[128]; 1324 unparse_flags(KDCOptions2int(b->kdc_options), asn1_KDCOptions_units(), 1325 fixedstr, sizeof(fixedstr)); 1326 if(*fixedstr) 1327 kdc_log(context, config, 0, "Requested flags: %s", fixedstr); 1328 } 1329 } 1330 1331 /* 1332 * verify the flags on `client' and `server', returning 0 1333 * if they are OK and generating an error messages and returning 1334 * and error code otherwise. 1335 */ 1336 1337 krb5_error_code 1338 kdc_check_flags(krb5_context context, 1339 krb5_kdc_configuration *config, 1340 hdb_entry_ex *client_ex, const char *client_name, 1341 hdb_entry_ex *server_ex, const char *server_name, 1342 krb5_boolean is_as_req) 1343 { 1344 if(client_ex != NULL) { 1345 hdb_entry *client = &client_ex->entry; 1346 1347 /* check client */ 1348 if (client->flags.locked_out) { 1349 kdc_log(context, config, 0, 1350 "Client (%s) is locked out", client_name); 1351 return KRB5KDC_ERR_POLICY; 1352 } 1353 1354 if (client->flags.invalid) { 1355 kdc_log(context, config, 0, 1356 "Client (%s) has invalid bit set", client_name); 1357 return KRB5KDC_ERR_POLICY; 1358 } 1359 1360 if(!client->flags.client){ 1361 kdc_log(context, config, 0, 1362 "Principal may not act as client -- %s", client_name); 1363 return KRB5KDC_ERR_POLICY; 1364 } 1365 1366 if (client->valid_start && *client->valid_start > kdc_time) { 1367 char starttime_str[100]; 1368 krb5_format_time(context, *client->valid_start, 1369 starttime_str, sizeof(starttime_str), TRUE); 1370 kdc_log(context, config, 0, 1371 "Client not yet valid until %s -- %s", 1372 starttime_str, client_name); 1373 return KRB5KDC_ERR_CLIENT_NOTYET; 1374 } 1375 1376 if (client->valid_end && *client->valid_end < kdc_time) { 1377 char endtime_str[100]; 1378 krb5_format_time(context, *client->valid_end, 1379 endtime_str, sizeof(endtime_str), TRUE); 1380 kdc_log(context, config, 0, 1381 "Client expired at %s -- %s", 1382 endtime_str, client_name); 1383 return KRB5KDC_ERR_NAME_EXP; 1384 } 1385 1386 if (client->flags.require_pwchange && 1387 (server_ex == NULL || !server_ex->entry.flags.change_pw)) { 1388 kdc_log(context, config, 0, 1389 "Client's key must be changed -- %s", client_name); 1390 return KRB5KDC_ERR_KEY_EXPIRED; 1391 } 1392 1393 if (client->pw_end && *client->pw_end < kdc_time 1394 && (server_ex == NULL || !server_ex->entry.flags.change_pw)) { 1395 char pwend_str[100]; 1396 krb5_format_time(context, *client->pw_end, 1397 pwend_str, sizeof(pwend_str), TRUE); 1398 kdc_log(context, config, 0, 1399 "Client's key has expired at %s -- %s", 1400 pwend_str, client_name); 1401 return KRB5KDC_ERR_KEY_EXPIRED; 1402 } 1403 } 1404 1405 /* check server */ 1406 1407 if (server_ex != NULL) { 1408 hdb_entry *server = &server_ex->entry; 1409 1410 if (server->flags.locked_out) { 1411 kdc_log(context, config, 0, 1412 "Client server locked out -- %s", server_name); 1413 return KRB5KDC_ERR_POLICY; 1414 } 1415 if (server->flags.invalid) { 1416 kdc_log(context, config, 0, 1417 "Server has invalid flag set -- %s", server_name); 1418 return KRB5KDC_ERR_POLICY; 1419 } 1420 1421 if(!server->flags.server){ 1422 kdc_log(context, config, 0, 1423 "Principal may not act as server -- %s", server_name); 1424 return KRB5KDC_ERR_POLICY; 1425 } 1426 1427 if(!is_as_req && server->flags.initial) { 1428 kdc_log(context, config, 0, 1429 "AS-REQ is required for server -- %s", server_name); 1430 return KRB5KDC_ERR_POLICY; 1431 } 1432 1433 if (server->valid_start && *server->valid_start > kdc_time) { 1434 char starttime_str[100]; 1435 krb5_format_time(context, *server->valid_start, 1436 starttime_str, sizeof(starttime_str), TRUE); 1437 kdc_log(context, config, 0, 1438 "Server not yet valid until %s -- %s", 1439 starttime_str, server_name); 1440 return KRB5KDC_ERR_SERVICE_NOTYET; 1441 } 1442 1443 if (server->valid_end && *server->valid_end < kdc_time) { 1444 char endtime_str[100]; 1445 krb5_format_time(context, *server->valid_end, 1446 endtime_str, sizeof(endtime_str), TRUE); 1447 kdc_log(context, config, 0, 1448 "Server expired at %s -- %s", 1449 endtime_str, server_name); 1450 return KRB5KDC_ERR_SERVICE_EXP; 1451 } 1452 1453 if (server->pw_end && *server->pw_end < kdc_time) { 1454 char pwend_str[100]; 1455 krb5_format_time(context, *server->pw_end, 1456 pwend_str, sizeof(pwend_str), TRUE); 1457 kdc_log(context, config, 0, 1458 "Server's key has expired at -- %s", 1459 pwend_str, server_name); 1460 return KRB5KDC_ERR_KEY_EXPIRED; 1461 } 1462 } 1463 return 0; 1464 } 1465 1466 /* 1467 * Return TRUE if `from' is part of `addresses' taking into consideration 1468 * the configuration variables that tells us how strict we should be about 1469 * these checks 1470 */ 1471 1472 krb5_boolean 1473 _kdc_check_addresses(krb5_context context, 1474 krb5_kdc_configuration *config, 1475 HostAddresses *addresses, const struct sockaddr *from) 1476 { 1477 krb5_error_code ret; 1478 krb5_address addr; 1479 krb5_boolean result; 1480 krb5_boolean only_netbios = TRUE; 1481 size_t i; 1482 1483 if(config->check_ticket_addresses == 0) 1484 return TRUE; 1485 1486 if(addresses == NULL) 1487 return config->allow_null_ticket_addresses; 1488 1489 for (i = 0; i < addresses->len; ++i) { 1490 if (addresses->val[i].addr_type != KRB5_ADDRESS_NETBIOS) { 1491 only_netbios = FALSE; 1492 } 1493 } 1494 1495 /* Windows sends it's netbios name, which I can only assume is 1496 * used for the 'allowed workstations' check. This is painful, 1497 * but we still want to check IP addresses if they happen to be 1498 * present. 1499 */ 1500 1501 if(only_netbios) 1502 return config->allow_null_ticket_addresses; 1503 1504 ret = krb5_sockaddr2address (context, from, &addr); 1505 if(ret) 1506 return FALSE; 1507 1508 result = krb5_address_search(context, &addr, addresses); 1509 krb5_free_address (context, &addr); 1510 return result; 1511 } 1512 1513 /* 1514 * 1515 */ 1516 krb5_error_code 1517 _kdc_check_anon_policy (krb5_context context, 1518 krb5_kdc_configuration *config, 1519 hdb_entry_ex *client, 1520 hdb_entry_ex *server) 1521 { 1522 if (!config->allow_anonymous){ 1523 kdc_log(context, config, 0, 1524 "Request for anonymous ticket denied by local policy"); 1525 return KRB5KDC_ERR_POLICY; 1526 } 1527 1528 return 0; 1529 } 1530 1531 /* 1532 * 1533 */ 1534 1535 static krb5_boolean 1536 send_pac_p(krb5_context context, KDC_REQ *req) 1537 { 1538 krb5_error_code ret; 1539 PA_PAC_REQUEST pacreq; 1540 const PA_DATA *pa; 1541 int i = 0; 1542 1543 pa = _kdc_find_padata(req, &i, KRB5_PADATA_PA_PAC_REQUEST); 1544 if (pa == NULL) 1545 return TRUE; 1546 1547 ret = decode_PA_PAC_REQUEST(pa->padata_value.data, 1548 pa->padata_value.length, 1549 &pacreq, 1550 NULL); 1551 if (ret) 1552 return TRUE; 1553 i = pacreq.include_pac; 1554 free_PA_PAC_REQUEST(&pacreq); 1555 if (i == 0) 1556 return FALSE; 1557 return TRUE; 1558 } 1559 1560 /* 1561 * 1562 */ 1563 1564 static krb5_error_code 1565 generate_pac(kdc_request_t r, Key *skey) 1566 { 1567 krb5_error_code ret; 1568 krb5_pac p = NULL; 1569 krb5_data data; 1570 1571 ret = _kdc_pac_generate(r->context, r->client, &p); 1572 if (ret) { 1573 _kdc_r_log(r, 0, "PAC generation failed for -- %s", 1574 r->client_name); 1575 return ret; 1576 } 1577 if (p == NULL) 1578 return 0; 1579 1580 ret = _krb5_pac_sign(r->context, p, r->et.authtime, 1581 r->client->entry.principal, 1582 &skey->key, /* Server key */ 1583 &skey->key, /* FIXME: should be krbtgt key */ 1584 &data); 1585 krb5_pac_free(r->context, p); 1586 if (ret) { 1587 _kdc_r_log(r, 0, "PAC signing failed for -- %s", 1588 r->client_name); 1589 return ret; 1590 } 1591 1592 ret = _kdc_tkt_add_if_relevant_ad(r->context, &r->et, 1593 KRB5_AUTHDATA_WIN2K_PAC, 1594 &data); 1595 krb5_data_free(&data); 1596 1597 return ret; 1598 } 1599 1600 /* 1601 * 1602 */ 1603 1604 krb5_boolean 1605 _kdc_is_anonymous(krb5_context context, krb5_const_principal principal) 1606 { 1607 return krb5_principal_is_anonymous(context, principal, KRB5_ANON_MATCH_ANY); 1608 } 1609 1610 static int 1611 require_preauth_p(kdc_request_t r) 1612 { 1613 return r->config->require_preauth 1614 || r->client->entry.flags.require_preauth 1615 || r->server->entry.flags.require_preauth; 1616 } 1617 1618 1619 /* 1620 * 1621 */ 1622 1623 static krb5_error_code 1624 add_enc_pa_rep(kdc_request_t r) 1625 { 1626 krb5_error_code ret; 1627 krb5_crypto crypto; 1628 Checksum checksum; 1629 krb5_data cdata; 1630 size_t len; 1631 1632 ret = krb5_crypto_init(r->context, &r->reply_key, 0, &crypto); 1633 if (ret) 1634 return ret; 1635 1636 ret = krb5_create_checksum(r->context, crypto, 1637 KRB5_KU_AS_REQ, 0, 1638 r->request.data, r->request.length, 1639 &checksum); 1640 krb5_crypto_destroy(r->context, crypto); 1641 if (ret) 1642 return ret; 1643 1644 ASN1_MALLOC_ENCODE(Checksum, cdata.data, cdata.length, 1645 &checksum, &len, ret); 1646 free_Checksum(&checksum); 1647 if (ret) 1648 return ret; 1649 heim_assert(cdata.length == len, "ASN.1 internal error"); 1650 1651 if (r->ek.encrypted_pa_data == NULL) { 1652 ALLOC(r->ek.encrypted_pa_data); 1653 if (r->ek.encrypted_pa_data == NULL) 1654 return ENOMEM; 1655 } 1656 ret = krb5_padata_add(r->context, r->ek.encrypted_pa_data, 1657 KRB5_PADATA_REQ_ENC_PA_REP, cdata.data, cdata.length); 1658 if (ret) 1659 return ret; 1660 1661 return krb5_padata_add(r->context, r->ek.encrypted_pa_data, 1662 KRB5_PADATA_FX_FAST, NULL, 0); 1663 } 1664 1665 /* 1666 * 1667 */ 1668 1669 krb5_error_code 1670 _kdc_as_rep(kdc_request_t r, 1671 krb5_data *reply, 1672 const char *from, 1673 struct sockaddr *from_addr, 1674 int datagram_reply) 1675 { 1676 krb5_context context = r->context; 1677 krb5_kdc_configuration *config = r->config; 1678 KDC_REQ *req = &r->req; 1679 KDC_REQ_BODY *b = NULL; 1680 AS_REP rep; 1681 KDCOptions f; 1682 krb5_enctype setype; 1683 krb5_error_code ret = 0; 1684 Key *skey; 1685 int found_pa = 0; 1686 int i, flags = HDB_F_FOR_AS_REQ; 1687 METHOD_DATA error_method; 1688 const PA_DATA *pa; 1689 1690 memset(&rep, 0, sizeof(rep)); 1691 error_method.len = 0; 1692 error_method.val = NULL; 1693 1694 /* 1695 * Look for FAST armor and unwrap 1696 */ 1697 ret = _kdc_fast_unwrap_request(r); 1698 if (ret) { 1699 _kdc_r_log(r, 0, "FAST unwrap request from %s failed: %d", from, ret); 1700 goto out; 1701 } 1702 1703 b = &req->req_body; 1704 f = b->kdc_options; 1705 1706 if (f.canonicalize) 1707 flags |= HDB_F_CANON; 1708 1709 if(b->sname == NULL){ 1710 ret = KRB5KRB_ERR_GENERIC; 1711 _kdc_set_e_text(r, "No server in request"); 1712 } else{ 1713 ret = _krb5_principalname2krb5_principal (context, 1714 &r->server_princ, 1715 *(b->sname), 1716 b->realm); 1717 if (ret == 0) 1718 ret = krb5_unparse_name(context, r->server_princ, &r->server_name); 1719 } 1720 if (ret) { 1721 kdc_log(context, config, 0, 1722 "AS-REQ malformed server name from %s", from); 1723 goto out; 1724 } 1725 if(b->cname == NULL){ 1726 ret = KRB5KRB_ERR_GENERIC; 1727 _kdc_set_e_text(r, "No client in request"); 1728 } else { 1729 ret = _krb5_principalname2krb5_principal (context, 1730 &r->client_princ, 1731 *(b->cname), 1732 b->realm); 1733 if (ret) 1734 goto out; 1735 1736 ret = krb5_unparse_name(context, r->client_princ, &r->client_name); 1737 } 1738 if (ret) { 1739 kdc_log(context, config, 0, 1740 "AS-REQ malformed client name from %s", from); 1741 goto out; 1742 } 1743 1744 kdc_log(context, config, 0, "AS-REQ %s from %s for %s", 1745 r->client_name, from, r->server_name); 1746 1747 /* 1748 * 1749 */ 1750 1751 if (_kdc_is_anonymous(context, r->client_princ) && 1752 !_kdc_is_anon_request(&r->req)) { 1753 kdc_log(context, config, 0, "Anonymous client w/o anonymous flag"); 1754 ret = KRB5KDC_ERR_BADOPTION; 1755 goto out; 1756 } 1757 1758 /* 1759 * 1760 */ 1761 1762 ret = _kdc_db_fetch(context, config, r->client_princ, 1763 HDB_F_GET_CLIENT | flags, NULL, 1764 &r->clientdb, &r->client); 1765 if(ret == HDB_ERR_NOT_FOUND_HERE) { 1766 kdc_log(context, config, 5, "client %s does not have secrets at this KDC, need to proxy", 1767 r->client_name); 1768 goto out; 1769 } else if (ret == HDB_ERR_WRONG_REALM) { 1770 char *fixed_client_name = NULL; 1771 1772 ret = krb5_unparse_name(context, r->client->entry.principal, 1773 &fixed_client_name); 1774 if (ret) { 1775 goto out; 1776 } 1777 1778 kdc_log(context, config, 0, "WRONG_REALM - %s -> %s", 1779 r->client_name, fixed_client_name); 1780 free(fixed_client_name); 1781 1782 ret = _kdc_fast_mk_error(context, r, 1783 &error_method, 1784 r->armor_crypto, 1785 &req->req_body, 1786 KRB5_KDC_ERR_WRONG_REALM, 1787 NULL, 1788 r->server_princ, 1789 NULL, 1790 &r->client->entry.principal->realm, 1791 NULL, NULL, 1792 reply); 1793 goto out; 1794 } else if(ret){ 1795 const char *msg = krb5_get_error_message(context, ret); 1796 kdc_log(context, config, 0, "UNKNOWN -- %s: %s", r->client_name, msg); 1797 krb5_free_error_message(context, msg); 1798 ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN; 1799 goto out; 1800 } 1801 ret = _kdc_db_fetch(context, config, r->server_princ, 1802 HDB_F_GET_SERVER|HDB_F_GET_KRBTGT | flags, 1803 NULL, NULL, &r->server); 1804 if(ret == HDB_ERR_NOT_FOUND_HERE) { 1805 kdc_log(context, config, 5, "target %s does not have secrets at this KDC, need to proxy", 1806 r->server_name); 1807 goto out; 1808 } else if(ret){ 1809 const char *msg = krb5_get_error_message(context, ret); 1810 kdc_log(context, config, 0, "UNKNOWN -- %s: %s", r->server_name, msg); 1811 krb5_free_error_message(context, msg); 1812 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN; 1813 goto out; 1814 } 1815 1816 /* 1817 * Select a session enctype from the list of the crypto system 1818 * supported enctypes that is supported by the client and is one of 1819 * the enctype of the enctype of the service (likely krbtgt). 1820 * 1821 * The latter is used as a hint of what enctypes all KDC support, 1822 * to make sure a newer version of KDC won't generate a session 1823 * enctype that an older version of a KDC in the same realm can't 1824 * decrypt. 1825 */ 1826 1827 ret = _kdc_find_etype(context, 1828 krb5_principal_is_krbtgt(context, r->server_princ) ? 1829 config->tgt_use_strongest_session_key : 1830 config->svc_use_strongest_session_key, FALSE, 1831 r->client, b->etype.val, b->etype.len, &r->sessionetype, 1832 NULL); 1833 if (ret) { 1834 kdc_log(context, config, 0, 1835 "Client (%s) from %s has no common enctypes with KDC " 1836 "to use for the session key", 1837 r->client_name, from); 1838 goto out; 1839 } 1840 1841 /* 1842 * Pre-auth processing 1843 */ 1844 1845 if(req->padata){ 1846 unsigned int n; 1847 1848 log_patypes(context, config, req->padata); 1849 1850 /* Check if preauth matching */ 1851 1852 for (n = 0; !found_pa && n < sizeof(pat) / sizeof(pat[0]); n++) { 1853 if (pat[n].validate == NULL) 1854 continue; 1855 if (r->armor_crypto == NULL && (pat[n].flags & PA_REQ_FAST)) 1856 continue; 1857 1858 kdc_log(context, config, 5, 1859 "Looking for %s pa-data -- %s", pat[n].name, r->client_name); 1860 i = 0; 1861 pa = _kdc_find_padata(req, &i, pat[n].type); 1862 if (pa) { 1863 ret = pat[n].validate(r, pa); 1864 if (ret != 0) { 1865 goto out; 1866 } 1867 kdc_log(context, config, 0, 1868 "%s pre-authentication succeeded -- %s", 1869 pat[n].name, r->client_name); 1870 found_pa = 1; 1871 r->et.flags.pre_authent = 1; 1872 } 1873 } 1874 } 1875 1876 if (found_pa == 0) { 1877 Key *ckey = NULL; 1878 size_t n; 1879 1880 for (n = 0; n < sizeof(pat) / sizeof(pat[0]); n++) { 1881 if ((pat[n].flags & PA_ANNOUNCE) == 0) 1882 continue; 1883 ret = krb5_padata_add(context, &error_method, 1884 pat[n].type, NULL, 0); 1885 if (ret) 1886 goto out; 1887 } 1888 1889 /* 1890 * If there is a client key, send ETYPE_INFO{,2} 1891 */ 1892 ret = _kdc_find_etype(context, 1893 config->preauth_use_strongest_session_key, TRUE, 1894 r->client, b->etype.val, b->etype.len, NULL, &ckey); 1895 if (ret == 0) { 1896 1897 /* 1898 * RFC4120 requires: 1899 * - If the client only knows about old enctypes, then send 1900 * both info replies (we send 'info' first in the list). 1901 * - If the client is 'modern', because it knows about 'new' 1902 * enctype types, then only send the 'info2' reply. 1903 * 1904 * Before we send the full list of etype-info data, we pick 1905 * the client key we would have used anyway below, just pick 1906 * that instead. 1907 */ 1908 1909 if (older_enctype(ckey->key.keytype)) { 1910 ret = get_pa_etype_info(context, config, 1911 &error_method, ckey); 1912 if (ret) 1913 goto out; 1914 } 1915 ret = get_pa_etype_info2(context, config, 1916 &error_method, ckey); 1917 if (ret) 1918 goto out; 1919 } 1920 1921 /* 1922 * send requre preauth is its required or anon is requested, 1923 * anon is today only allowed via preauth mechanisms. 1924 */ 1925 if (require_preauth_p(r) || _kdc_is_anon_request(&r->req)) { 1926 ret = KRB5KDC_ERR_PREAUTH_REQUIRED; 1927 _kdc_set_e_text(r, "Need to use PA-ENC-TIMESTAMP/PA-PK-AS-REQ"); 1928 goto out; 1929 } 1930 1931 if (ckey == NULL) { 1932 ret = KRB5KDC_ERR_CLIENT_NOTYET; 1933 _kdc_set_e_text(r, "Doesn't have a client key available"); 1934 goto out; 1935 } 1936 krb5_free_keyblock_contents(r->context, &r->reply_key); 1937 ret = krb5_copy_keyblock_contents(r->context, &ckey->key, &r->reply_key); 1938 if (ret) 1939 goto out; 1940 } 1941 1942 if (r->clientdb->hdb_auth_status) { 1943 r->clientdb->hdb_auth_status(context, r->clientdb, r->client, 1944 HDB_AUTH_SUCCESS); 1945 } 1946 1947 /* 1948 * Verify flags after the user been required to prove its identity 1949 * with in a preauth mech. 1950 */ 1951 1952 ret = _kdc_check_access(context, config, r->client, r->client_name, 1953 r->server, r->server_name, 1954 req, &error_method); 1955 if(ret) 1956 goto out; 1957 1958 if (_kdc_is_anon_request(&r->req)) { 1959 ret = _kdc_check_anon_policy(context, config, r->client, r->server); 1960 if (ret) { 1961 _kdc_set_e_text(r, "Anonymous ticket requests are disabled"); 1962 goto out; 1963 } 1964 1965 r->et.flags.anonymous = 1; 1966 } 1967 1968 /* 1969 * Select the best encryption type for the KDC with out regard to 1970 * the client since the client never needs to read that data. 1971 */ 1972 1973 ret = _kdc_get_preferred_key(context, config, 1974 r->server, r->server_name, 1975 &setype, &skey); 1976 if(ret) 1977 goto out; 1978 1979 if(f.renew || f.validate || f.proxy || f.forwarded || f.enc_tkt_in_skey) { 1980 ret = KRB5KDC_ERR_BADOPTION; 1981 _kdc_set_e_text(r, "Bad KDC options"); 1982 goto out; 1983 } 1984 1985 /* 1986 * Build reply 1987 */ 1988 1989 rep.pvno = 5; 1990 rep.msg_type = krb_as_rep; 1991 1992 if (!config->historical_anon_realm && 1993 _kdc_is_anonymous(context, r->client_princ)) { 1994 Realm anon_realm = KRB5_ANON_REALM; 1995 ret = copy_Realm(&anon_realm, &rep.crealm); 1996 } else 1997 ret = copy_Realm(&r->client->entry.principal->realm, &rep.crealm); 1998 if (ret) 1999 goto out; 2000 if (r->et.flags.anonymous) 2001 ret = _kdc_make_anonymous_principalname(&rep.cname); 2002 else 2003 ret = _krb5_principal2principalname(&rep.cname, r->client->entry.principal); 2004 if (ret) 2005 goto out; 2006 2007 rep.ticket.tkt_vno = 5; 2008 ret = copy_Realm(&r->server->entry.principal->realm, &rep.ticket.realm); 2009 if (ret) 2010 goto out; 2011 _krb5_principal2principalname(&rep.ticket.sname, 2012 r->server->entry.principal); 2013 /* java 1.6 expects the name to be the same type, lets allow that 2014 * uncomplicated name-types. */ 2015 #define CNT(sp,t) (((sp)->sname->name_type) == KRB5_NT_##t) 2016 if (CNT(b, UNKNOWN) || CNT(b, PRINCIPAL) || CNT(b, SRV_INST) || CNT(b, SRV_HST) || CNT(b, SRV_XHST)) 2017 rep.ticket.sname.name_type = b->sname->name_type; 2018 #undef CNT 2019 2020 r->et.flags.initial = 1; 2021 if(r->client->entry.flags.forwardable && r->server->entry.flags.forwardable) 2022 r->et.flags.forwardable = f.forwardable; 2023 else if (f.forwardable) { 2024 _kdc_set_e_text(r, "Ticket may not be forwardable"); 2025 ret = KRB5KDC_ERR_POLICY; 2026 goto out; 2027 } 2028 if(r->client->entry.flags.proxiable && r->server->entry.flags.proxiable) 2029 r->et.flags.proxiable = f.proxiable; 2030 else if (f.proxiable) { 2031 _kdc_set_e_text(r, "Ticket may not be proxiable"); 2032 ret = KRB5KDC_ERR_POLICY; 2033 goto out; 2034 } 2035 if(r->client->entry.flags.postdate && r->server->entry.flags.postdate) 2036 r->et.flags.may_postdate = f.allow_postdate; 2037 else if (f.allow_postdate){ 2038 _kdc_set_e_text(r, "Ticket may not be postdate"); 2039 ret = KRB5KDC_ERR_POLICY; 2040 goto out; 2041 } 2042 2043 /* check for valid set of addresses */ 2044 if(!_kdc_check_addresses(context, config, b->addresses, from_addr)) { 2045 _kdc_set_e_text(r, "Bad address list in requested"); 2046 ret = KRB5KRB_AP_ERR_BADADDR; 2047 goto out; 2048 } 2049 2050 ret = copy_PrincipalName(&rep.cname, &r->et.cname); 2051 if (ret) 2052 goto out; 2053 ret = copy_Realm(&rep.crealm, &r->et.crealm); 2054 if (ret) 2055 goto out; 2056 2057 { 2058 time_t start; 2059 time_t t; 2060 2061 start = r->et.authtime = kdc_time; 2062 2063 if(f.postdated && req->req_body.from){ 2064 ALLOC(r->et.starttime); 2065 start = *r->et.starttime = *req->req_body.from; 2066 r->et.flags.invalid = 1; 2067 r->et.flags.postdated = 1; /* XXX ??? */ 2068 } 2069 _kdc_fix_time(&b->till); 2070 t = *b->till; 2071 2072 /* be careful not overflowing */ 2073 2074 if(r->client->entry.max_life) 2075 t = start + min(t - start, *r->client->entry.max_life); 2076 if(r->server->entry.max_life) 2077 t = start + min(t - start, *r->server->entry.max_life); 2078 #if 0 2079 t = min(t, start + realm->max_life); 2080 #endif 2081 r->et.endtime = t; 2082 if(f.renewable_ok && r->et.endtime < *b->till){ 2083 f.renewable = 1; 2084 if(b->rtime == NULL){ 2085 ALLOC(b->rtime); 2086 *b->rtime = 0; 2087 } 2088 if(*b->rtime < *b->till) 2089 *b->rtime = *b->till; 2090 } 2091 if(f.renewable && b->rtime){ 2092 t = *b->rtime; 2093 if(t == 0) 2094 t = MAX_TIME; 2095 if(r->client->entry.max_renew) 2096 t = start + min(t - start, *r->client->entry.max_renew); 2097 if(r->server->entry.max_renew) 2098 t = start + min(t - start, *r->server->entry.max_renew); 2099 #if 0 2100 t = min(t, start + realm->max_renew); 2101 #endif 2102 ALLOC(r->et.renew_till); 2103 *r->et.renew_till = t; 2104 r->et.flags.renewable = 1; 2105 } 2106 } 2107 2108 if(b->addresses){ 2109 ALLOC(r->et.caddr); 2110 copy_HostAddresses(b->addresses, r->et.caddr); 2111 } 2112 2113 r->et.transited.tr_type = DOMAIN_X500_COMPRESS; 2114 krb5_data_zero(&r->et.transited.contents); 2115 2116 /* The MIT ASN.1 library (obviously) doesn't tell lengths encoded 2117 * as 0 and as 0x80 (meaning indefinite length) apart, and is thus 2118 * incapable of correctly decoding SEQUENCE OF's of zero length. 2119 * 2120 * To fix this, always send at least one no-op last_req 2121 * 2122 * If there's a pw_end or valid_end we will use that, 2123 * otherwise just a dummy lr. 2124 */ 2125 r->ek.last_req.val = malloc(2 * sizeof(*r->ek.last_req.val)); 2126 if (r->ek.last_req.val == NULL) { 2127 ret = ENOMEM; 2128 goto out; 2129 } 2130 r->ek.last_req.len = 0; 2131 if (r->client->entry.pw_end 2132 && (config->kdc_warn_pwexpire == 0 2133 || kdc_time + config->kdc_warn_pwexpire >= *r->client->entry.pw_end)) { 2134 r->ek.last_req.val[r->ek.last_req.len].lr_type = LR_PW_EXPTIME; 2135 r->ek.last_req.val[r->ek.last_req.len].lr_value = *r->client->entry.pw_end; 2136 ++r->ek.last_req.len; 2137 } 2138 if (r->client->entry.valid_end) { 2139 r->ek.last_req.val[r->ek.last_req.len].lr_type = LR_ACCT_EXPTIME; 2140 r->ek.last_req.val[r->ek.last_req.len].lr_value = *r->client->entry.valid_end; 2141 ++r->ek.last_req.len; 2142 } 2143 if (r->ek.last_req.len == 0) { 2144 r->ek.last_req.val[r->ek.last_req.len].lr_type = LR_NONE; 2145 r->ek.last_req.val[r->ek.last_req.len].lr_value = 0; 2146 ++r->ek.last_req.len; 2147 } 2148 r->ek.nonce = b->nonce; 2149 if (r->client->entry.valid_end || r->client->entry.pw_end) { 2150 ALLOC(r->ek.key_expiration); 2151 if (r->client->entry.valid_end) { 2152 if (r->client->entry.pw_end) 2153 *r->ek.key_expiration = min(*r->client->entry.valid_end, 2154 *r->client->entry.pw_end); 2155 else 2156 *r->ek.key_expiration = *r->client->entry.valid_end; 2157 } else 2158 *r->ek.key_expiration = *r->client->entry.pw_end; 2159 } else 2160 r->ek.key_expiration = NULL; 2161 r->ek.flags = r->et.flags; 2162 r->ek.authtime = r->et.authtime; 2163 if (r->et.starttime) { 2164 ALLOC(r->ek.starttime); 2165 *r->ek.starttime = *r->et.starttime; 2166 } 2167 r->ek.endtime = r->et.endtime; 2168 if (r->et.renew_till) { 2169 ALLOC(r->ek.renew_till); 2170 *r->ek.renew_till = *r->et.renew_till; 2171 } 2172 ret = copy_Realm(&rep.ticket.realm, &r->ek.srealm); 2173 if (ret) 2174 goto out; 2175 ret = copy_PrincipalName(&rep.ticket.sname, &r->ek.sname); 2176 if (ret) 2177 goto out; 2178 if(r->et.caddr){ 2179 ALLOC(r->ek.caddr); 2180 copy_HostAddresses(r->et.caddr, r->ek.caddr); 2181 } 2182 2183 /* 2184 * Check and session and reply keys 2185 */ 2186 2187 if (r->session_key.keytype == ETYPE_NULL) { 2188 ret = krb5_generate_random_keyblock(context, r->sessionetype, &r->session_key); 2189 if (ret) 2190 goto out; 2191 } 2192 2193 if (r->reply_key.keytype == ETYPE_NULL) { 2194 _kdc_set_e_text(r, "Client have no reply key"); 2195 ret = KRB5KDC_ERR_CLIENT_NOTYET; 2196 goto out; 2197 } 2198 2199 ret = copy_EncryptionKey(&r->session_key, &r->et.key); 2200 if (ret) 2201 goto out; 2202 2203 ret = copy_EncryptionKey(&r->session_key, &r->ek.key); 2204 if (ret) 2205 goto out; 2206 2207 if (r->outpadata.len) { 2208 2209 ALLOC(rep.padata); 2210 if (rep.padata == NULL) { 2211 ret = ENOMEM; 2212 goto out; 2213 } 2214 ret = copy_METHOD_DATA(&r->outpadata, rep.padata); 2215 if (ret) 2216 goto out; 2217 } 2218 2219 /* Add the PAC */ 2220 if (send_pac_p(context, req) && !r->et.flags.anonymous) { 2221 generate_pac(r, skey); 2222 } 2223 2224 _kdc_log_timestamp(context, config, "AS-REQ", r->et.authtime, r->et.starttime, 2225 r->et.endtime, r->et.renew_till); 2226 2227 { 2228 krb5_principal client_principal; 2229 2230 ret = _krb5_principalname2krb5_principal(context, &client_principal, 2231 rep.cname, rep.crealm); 2232 if (ret) 2233 goto out; 2234 2235 /* do this as the last thing since this signs the EncTicketPart */ 2236 ret = _kdc_add_KRB5SignedPath(context, 2237 config, 2238 r->server, 2239 setype, 2240 client_principal, 2241 NULL, 2242 NULL, 2243 &r->et); 2244 krb5_free_principal(context, client_principal); 2245 if (ret) 2246 goto out; 2247 } 2248 2249 log_as_req(context, config, r->reply_key.keytype, setype, b); 2250 2251 /* 2252 * We always say we support FAST/enc-pa-rep 2253 */ 2254 2255 r->et.flags.enc_pa_rep = r->ek.flags.enc_pa_rep = 1; 2256 2257 /* 2258 * Add REQ_ENC_PA_REP if client supports it 2259 */ 2260 2261 i = 0; 2262 pa = _kdc_find_padata(req, &i, KRB5_PADATA_REQ_ENC_PA_REP); 2263 if (pa) { 2264 2265 ret = add_enc_pa_rep(r); 2266 if (ret) { 2267 const char *msg = krb5_get_error_message(r->context, ret); 2268 _kdc_r_log(r, 0, "add_enc_pa_rep failed: %s: %d", msg, ret); 2269 krb5_free_error_message(r->context, msg); 2270 goto out; 2271 } 2272 } 2273 2274 /* 2275 * 2276 */ 2277 2278 ret = _kdc_encode_reply(context, config, 2279 r->armor_crypto, req->req_body.nonce, 2280 &rep, &r->et, &r->ek, setype, r->server->entry.kvno, 2281 &skey->key, r->client->entry.kvno, 2282 &r->reply_key, 0, &r->e_text, reply); 2283 if (ret) 2284 goto out; 2285 2286 /* 2287 * Check if message too large 2288 */ 2289 if (datagram_reply && reply->length > config->max_datagram_reply_length) { 2290 krb5_data_free(reply); 2291 ret = KRB5KRB_ERR_RESPONSE_TOO_BIG; 2292 _kdc_set_e_text(r, "Reply packet too large"); 2293 } 2294 2295 out: 2296 free_AS_REP(&rep); 2297 2298 /* 2299 * In case of a non proxy error, build an error message. 2300 */ 2301 if (ret != 0 && ret != HDB_ERR_NOT_FOUND_HERE && reply->length == 0) { 2302 ret = _kdc_fast_mk_error(context, r, 2303 &error_method, 2304 r->armor_crypto, 2305 &req->req_body, 2306 ret, r->e_text, 2307 r->server_princ, 2308 r->client_princ ? 2309 &r->client_princ->name : NULL, 2310 r->client_princ ? 2311 &r->client_princ->realm : NULL, 2312 NULL, NULL, 2313 reply); 2314 if (ret) 2315 goto out2; 2316 } 2317 out2: 2318 free_EncTicketPart(&r->et); 2319 free_EncKDCRepPart(&r->ek); 2320 free_KDCFastState(&r->fast); 2321 2322 if (error_method.len) 2323 free_METHOD_DATA(&error_method); 2324 if (r->outpadata.len) 2325 free_METHOD_DATA(&r->outpadata); 2326 if (r->client_princ) { 2327 krb5_free_principal(context, r->client_princ); 2328 r->client_princ = NULL; 2329 } 2330 if (r->client_name) { 2331 free(r->client_name); 2332 r->client_name = NULL; 2333 } 2334 if (r->server_princ){ 2335 krb5_free_principal(context, r->server_princ); 2336 r->server_princ = NULL; 2337 } 2338 if (r->server_name) { 2339 free(r->server_name); 2340 r->server_name = NULL; 2341 } 2342 if (r->client) 2343 _kdc_free_ent(context, r->client); 2344 if (r->server) 2345 _kdc_free_ent(context, r->server); 2346 if (r->armor_crypto) { 2347 krb5_crypto_destroy(r->context, r->armor_crypto); 2348 r->armor_crypto = NULL; 2349 } 2350 krb5_free_keyblock_contents(r->context, &r->reply_key); 2351 krb5_free_keyblock_contents(r->context, &r->session_key); 2352 return ret; 2353 } 2354 2355 /* 2356 * Add the AuthorizationData `data of `type to the last element in 2357 * the sequence of authorization_data in `tkt wrapped in an IF_RELEVANT 2358 */ 2359 2360 krb5_error_code 2361 _kdc_tkt_add_if_relevant_ad(krb5_context context, 2362 EncTicketPart *tkt, 2363 int type, 2364 const krb5_data *data) 2365 { 2366 krb5_error_code ret; 2367 size_t size = 0; 2368 2369 if (tkt->authorization_data == NULL) { 2370 tkt->authorization_data = calloc(1, sizeof(*tkt->authorization_data)); 2371 if (tkt->authorization_data == NULL) { 2372 krb5_set_error_message(context, ENOMEM, "out of memory"); 2373 return ENOMEM; 2374 } 2375 } 2376 2377 /* add the entry to the last element */ 2378 { 2379 AuthorizationData ad = { 0, NULL }; 2380 AuthorizationDataElement ade; 2381 2382 ade.ad_type = type; 2383 ade.ad_data = *data; 2384 2385 ret = add_AuthorizationData(&ad, &ade); 2386 if (ret) { 2387 krb5_set_error_message(context, ret, "add AuthorizationData failed"); 2388 return ret; 2389 } 2390 2391 ade.ad_type = KRB5_AUTHDATA_IF_RELEVANT; 2392 2393 ASN1_MALLOC_ENCODE(AuthorizationData, 2394 ade.ad_data.data, ade.ad_data.length, 2395 &ad, &size, ret); 2396 free_AuthorizationData(&ad); 2397 if (ret) { 2398 krb5_set_error_message(context, ret, "ASN.1 encode of " 2399 "AuthorizationData failed"); 2400 return ret; 2401 } 2402 if (ade.ad_data.length != size) 2403 krb5_abortx(context, "internal asn.1 encoder error"); 2404 2405 ret = add_AuthorizationData(tkt->authorization_data, &ade); 2406 der_free_octet_string(&ade.ad_data); 2407 if (ret) { 2408 krb5_set_error_message(context, ret, "add AuthorizationData failed"); 2409 return ret; 2410 } 2411 } 2412 2413 return 0; 2414 } 2415
Indexes created Sat Feb 28 05:31:39 UTC 2026