source3/libsmb/clikrb5.c

   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 2005-2007
   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 #define KRB5_PRIVATE    1       /* this file uses PRIVATE interfaces! */
  24 #define KRB5_DEPRECATED 1       /* this file uses DEPRECATED interfaces! */
  25
  26 #include "includes.h"
  27
  28 #ifdef HAVE_KRB5
  29
  30 #ifdef HAVE_KRB5_KEYBLOCK_KEYVALUE /* Heimdal */
  31 #define KRB5_KEY_TYPE(k)        ((k)->keytype)
  32 #define KRB5_KEY_LENGTH(k)      ((k)->keyvalue.length)
  33 #define KRB5_KEY_DATA(k)        ((k)->keyvalue.data)
  34 #else /* MIT */
  35 #define KRB5_KEY_TYPE(k)        ((k)->enctype)
  36 #define KRB5_KEY_LENGTH(k)      ((k)->length)
  37 #define KRB5_KEY_DATA(k)        ((k)->contents)
  38 #endif /* HAVE_KRB5_KEYBLOCK_KEYVALUE */
  39
  40 /**************************************************************
  41  Wrappers around kerberos string functions that convert from
  42  utf8 -> unix charset and vica versa.
  43 **************************************************************/
  44
  45 /**************************************************************
  46  krb5_parse_name that takes a UNIX charset.
  47 **************************************************************/
  48
  49  krb5_error_code smb_krb5_parse_name(krb5_context context,
  50                                 const char *name, /* in unix charset */
  51                                 krb5_principal *principal)
  52 {
  53         krb5_error_code ret;
  54         char *utf8_name;
  55
  56         if (push_utf8_allocate(&utf8_name, name) == (size_t)-1) {
  57                 return ENOMEM;
  58         }
  59
  60         ret = krb5_parse_name(context, utf8_name, principal);
  61         SAFE_FREE(utf8_name);
  62         return ret;
  63 }
  64
  65 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
  66 /**************************************************************
  67  krb5_parse_name_norealm that takes a UNIX charset.
  68 **************************************************************/
  69
  70 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
  71                                 const char *name, /* in unix charset */
  72                                 krb5_principal *principal)
  73 {
  74         krb5_error_code ret;
  75         char *utf8_name;
  76
  77         *principal = NULL;
  78         if (push_utf8_allocate(&utf8_name, name) == (size_t)-1) {
  79                 return ENOMEM;
  80         }
  81
  82         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  83         SAFE_FREE(utf8_name);
  84         return ret;
  85 }
  86 #endif
  87
  88 /**************************************************************
  89  krb5_parse_name that returns a UNIX charset name. Must
  90  be freed with normal free() call.
  91 **************************************************************/
  92
  93  krb5_error_code smb_krb5_unparse_name(krb5_context context,
  94                                         krb5_const_principal principal,
  95                                         char **unix_name)
  96 {
  97         krb5_error_code ret;
  98         char *utf8_name;
  99
 100         *unix_name = NULL;
 101         ret = krb5_unparse_name(context, principal, &utf8_name);
 102         if (ret) {
 103                 return ret;
 104         }
 105
 106         if (pull_utf8_allocate(unix_name, utf8_name)==-1) {
 107                 krb5_free_unparsed_name(context, utf8_name);
 108                 return ENOMEM;
 109         }
 110         krb5_free_unparsed_name(context, utf8_name);
 111         return 0;
 112 }
 113
 114 #ifndef HAVE_KRB5_SET_REAL_TIME
 115 /*
 116  * This function is not in the Heimdal mainline.
 117  */
 118  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 119 {
 120         krb5_error_code ret;
 121         int32_t sec, usec;
 122
 123         ret = krb5_us_timeofday(context, &sec, &usec);
 124         if (ret)
 125                 return ret;
 126
 127         context->kdc_sec_offset = seconds - sec;
 128         context->kdc_usec_offset = microseconds - usec;
 129
 130         return 0;
 131 }
 132 #endif
 133
 134 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 135
 136 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 137
 138 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 139  * to krb5_set_default_tgs_ktypes. See
 140  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 141  *
 142  * If the MIT libraries are not exporting internal symbols, we will end up in
 143  * this branch, which is correct. Otherwise we will continue to use the
 144  * internal symbol
 145  */
 146  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 147 {
 148     return krb5_set_default_tgs_enctypes(ctx, enc);
 149 }
 150
 151 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 152
 153 /* Heimdal */
 154  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 155 {
 156         return krb5_set_default_in_tkt_etypes(ctx, enc);
 157 }
 158
 159 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 160
 161 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 162
 163 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 164 /* HEIMDAL */
 165  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 166 {
 167         memset(pkaddr, '\0', sizeof(krb5_address));
 168 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 169         if (paddr->ss_family == AF_INET6) {
 170                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 171                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 172                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 173                 return true;
 174         }
 175 #endif
 176         if (paddr->ss_family == AF_INET) {
 177                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 178                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 179                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 180                 return true;
 181         }
 182         return false;
 183 }
 184 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 185 /* MIT */
 186  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 187 {
 188         memset(pkaddr, '\0', sizeof(krb5_address));
 189 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 190         if (paddr->ss_family == AF_INET6) {
 191                 pkaddr->addrtype = ADDRTYPE_INET6;
 192                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 193                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 194                 return true;
 195         }
 196 #endif
 197         if (paddr->ss_family == AF_INET) {
 198                 pkaddr->addrtype = ADDRTYPE_INET;
 199                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 200                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 201                 return true;
 202         }
 203         return false;
 204 }
 205 #else
 206 #error UNKNOWN_ADDRTYPE
 207 #endif
 208
 209 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 210  int create_kerberos_key_from_string_direct(krb5_context context,
 211                                         krb5_principal host_princ,
 212                                         krb5_data *password,
 213                                         krb5_keyblock *key,
 214                                         krb5_enctype enctype)
 215 {
 216         int ret;
 217         krb5_data salt;
 218         krb5_encrypt_block eblock;
 219
 220         ret = krb5_principal2salt(context, host_princ, &salt);
 221         if (ret) {
 222                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 223                 return ret;
 224         }
 225         krb5_use_enctype(context, &eblock, enctype);
 226         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 227         SAFE_FREE(salt.data);
 228         return ret;
 229 }
 230 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 231  int create_kerberos_key_from_string_direct(krb5_context context,
 232                                         krb5_principal host_princ,
 233                                         krb5_data *password,
 234                                         krb5_keyblock *key,
 235                                         krb5_enctype enctype)
 236 {
 237         int ret;
 238         krb5_salt salt;
 239
 240         ret = krb5_get_pw_salt(context, host_princ, &salt);
 241         if (ret) {
 242                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 243                 return ret;
 244         }
 245
 246         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 247         krb5_free_salt(context, salt);
 248         return ret;
 249 }
 250 #else
 251 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 252 #endif
 253
 254  int create_kerberos_key_from_string(krb5_context context,
 255                                         krb5_principal host_princ,
 256                                         krb5_data *password,
 257                                         krb5_keyblock *key,
 258                                         krb5_enctype enctype)
 259 {
 260         krb5_principal salt_princ = NULL;
 261         int ret;
 262         /*
 263          * Check if we've determined that the KDC is salting keys for this
 264          * principal/enctype in a non-obvious way.  If it is, try to match
 265          * its behavior.
 266          */
 267         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 268         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 269         if (salt_princ) {
 270                 krb5_free_principal(context, salt_princ);
 271         }
 272         return ret;
 273 }
 274
 275 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 276  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 277                                             krb5_enctype **enctypes)
 278 {
 279         return krb5_get_permitted_enctypes(context, enctypes);
 280 }
 281 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 282  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 283                                             krb5_enctype **enctypes)
 284 {
 285         return krb5_get_default_in_tkt_etypes(context, enctypes);
 286 }
 287 #else
 288 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 289 #endif
 290
 291 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 292  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 293                                         krb5_auth_context auth_context,
 294                                         krb5_keyblock *keyblock)
 295 {
 296         return krb5_auth_con_setkey(context, auth_context, keyblock);
 297 }
 298 #endif
 299
 300 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 301                            DATA_BLOB *edata,
 302                            DATA_BLOB *edata_out)
 303 {
 304         DATA_BLOB edata_contents;
 305         ASN1_DATA data;
 306         int edata_type;
 307
 308         if (!edata->length) {
 309                 return False;
 310         }
 311
 312         asn1_load(&data, *edata);
 313         asn1_start_tag(&data, ASN1_SEQUENCE(0));
 314         asn1_start_tag(&data, ASN1_CONTEXT(1));
 315         asn1_read_Integer(&data, &edata_type);
 316
 317         if (edata_type != KRB5_PADATA_PW_SALT) {
 318                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 319                         KRB5_PADATA_PW_SALT, edata_type));
 320                 asn1_free(&data);
 321                 return False;
 322         }
 323
 324         asn1_start_tag(&data, ASN1_CONTEXT(2));
 325         asn1_read_OctetString(&data, &edata_contents);
 326         asn1_end_tag(&data);
 327         asn1_end_tag(&data);
 328         asn1_end_tag(&data);
 329         asn1_free(&data);
 330
 331         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 332
 333         data_blob_free(&edata_contents);
 334
 335         return True;
 336 }
 337
 338
 339 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 340 {
 341         DATA_BLOB pac_contents;
 342         ASN1_DATA data;
 343         int data_type;
 344
 345         if (!auth_data->length) {
 346                 return False;
 347         }
 348
 349         asn1_load(&data, *auth_data);
 350         asn1_start_tag(&data, ASN1_SEQUENCE(0));
 351         asn1_start_tag(&data, ASN1_SEQUENCE(0));
 352         asn1_start_tag(&data, ASN1_CONTEXT(0));
 353         asn1_read_Integer(&data, &data_type);
 354
 355         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 356                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 357                 asn1_free(&data);
 358                 return False;
 359         }
 360
 361         asn1_end_tag(&data);
 362         asn1_start_tag(&data, ASN1_CONTEXT(1));
 363         asn1_read_OctetString(&data, &pac_contents);
 364         asn1_end_tag(&data);
 365         asn1_end_tag(&data);
 366         asn1_end_tag(&data);
 367         asn1_free(&data);
 368
 369         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 370
 371         data_blob_free(&pac_contents);
 372
 373         return True;
 374 }
 375
 376  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 377 {
 378         DATA_BLOB auth_data_wrapped;
 379         bool got_auth_data_pac = False;
 380         int i;
 381
 382 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 383         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 384             tkt->enc_part2->authorization_data[0] &&
 385             tkt->enc_part2->authorization_data[0]->length)
 386         {
 387                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 388
 389                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 390                             KRB5_AUTHDATA_IF_RELEVANT) {
 391                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 392                                         tkt->enc_part2->authorization_data[i]->ad_type));
 393                                 continue;
 394                         }
 395
 396                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 397                                                       tkt->enc_part2->authorization_data[i]->length);
 398
 399                         /* check if it is a PAC */
 400                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 401                         data_blob_free(&auth_data_wrapped);
 402
 403                         if (got_auth_data_pac) {
 404                                 return true;
 405                         }
 406                 }
 407
 408                 return got_auth_data_pac;
 409         }
 410
 411 #else
 412         if (tkt->ticket.authorization_data &&
 413             tkt->ticket.authorization_data->len)
 414         {
 415                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 416
 417                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 418                             KRB5_AUTHDATA_IF_RELEVANT) {
 419                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 420                                         tkt->ticket.authorization_data->val[i].ad_type));
 421                                 continue;
 422                         }
 423
 424                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 425                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 426
 427                         /* check if it is a PAC */
 428                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 429                         data_blob_free(&auth_data_wrapped);
 430
 431                         if (got_auth_data_pac) {
 432                                 return true;
 433                         }
 434                 }
 435
 436                 return got_auth_data_pac;
 437         }
 438 #endif
 439         return False;
 440 }
 441
 442  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 443 {
 444 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 445         return tkt->enc_part2->client;
 446 #else
 447         return tkt->client;
 448 #endif
 449 }
 450
 451 #if !defined(HAVE_KRB5_LOCATE_KDC)
 452
 453 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 454  * to a public interface for this functionality, so we have to be able to live
 455  * without it if the MIT libraries are hiding their internal symbols.
 456  */
 457
 458 #if defined(KRB5_KRBHST_INIT)
 459 /* Heimdal */
 460  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 461 {
 462         krb5_krbhst_handle hnd;
 463         krb5_krbhst_info *hinfo;
 464         krb5_error_code rc;
 465         int num_kdcs, i;
 466         struct sockaddr *sa;
 467         struct addrinfo *ai;
 468
 469         *addr_pp = NULL;
 470         *naddrs = 0;
 471
 472         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 473         if (rc) {
 474                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 475                 return rc;
 476         }
 477
 478         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 479                 ;
 480
 481         krb5_krbhst_reset(ctx, hnd);
 482
 483         if (!num_kdcs) {
 484                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 485                 krb5_krbhst_free(ctx, hnd);
 486                 return -1;
 487         }
 488
 489         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 490         if (!sa) {
 491                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 492                 krb5_krbhst_free(ctx, hnd);
 493                 naddrs = 0;
 494                 return -1;
 495         }
 496
 497         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 498
 499         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 500
 501 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 502                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 503                 if (rc) {
 504                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 505                         continue;
 506                 }
 507 #endif
 508                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 509                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 510         }
 511
 512         krb5_krbhst_free(ctx, hnd);
 513
 514         *naddrs = num_kdcs;
 515         *addr_pp = sa;
 516         return 0;
 517 }
 518
 519 #else /* ! defined(KRB5_KRBHST_INIT) */
 520
 521  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 522                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 523 {
 524         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 525         return KRB5_KDC_UNREACH;
 526 }
 527
 528 #endif /* KRB5_KRBHST_INIT */
 529
 530 #else /* ! HAVE_KRB5_LOCATE_KDC */
 531
 532  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 533                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 534 {
 535         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 536 }
 537
 538 #endif /* HAVE_KRB5_LOCATE_KDC */
 539
 540 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 541  void krb5_free_unparsed_name(krb5_context context, char *val)
 542 {
 543         SAFE_FREE(val);
 544 }
 545 #endif
 546
 547  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 548 {
 549 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 550         if (pdata->data) {
 551                 krb5_free_data_contents(context, pdata);
 552         }
 553 #else
 554         SAFE_FREE(pdata->data);
 555 #endif
 556 }
 557
 558  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 559 {
 560 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 561         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 562 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 563         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 564 #else
 565 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 566 #endif
 567 }
 568
 569  bool kerberos_compatible_enctypes(krb5_context context,
 570                                   krb5_enctype enctype1,
 571                                   krb5_enctype enctype2)
 572 {
 573 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 574         krb5_boolean similar = 0;
 575
 576         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 577         return similar ? True : False;
 578 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 579         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 580 #endif
 581 }
 582
 583 static bool ads_cleanup_expired_creds(krb5_context context,
 584                                       krb5_ccache  ccache,
 585                                       krb5_creds  *credsp)
 586 {
 587         krb5_error_code retval;
 588         const char *cc_type = krb5_cc_get_type(context, ccache);
 589
 590         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 591                   cc_type, krb5_cc_get_name(context, ccache),
 592                   http_timestring(credsp->times.endtime)));
 593
 594         /* we will probably need new tickets if the current ones
 595            will expire within 10 seconds.
 596         */
 597         if (credsp->times.endtime >= (time(NULL) + 10))
 598                 return False;
 599
 600         /* heimdal won't remove creds from a file ccache, and
 601            perhaps we shouldn't anyway, since internally we
 602            use memory ccaches, and a FILE one probably means that
 603            we're using creds obtained outside of our exectuable
 604         */
 605         if (strequal(cc_type, "FILE")) {
 606                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 607                 return False;
 608         }
 609
 610         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 611         if (retval) {
 612                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 613                           error_message(retval)));
 614                 /* If we have an error in this, we want to display it,
 615                    but continue as though we deleted it */
 616         }
 617         return True;
 618 }
 619
 620 /*
 621   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 622 */
 623 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 624                                        krb5_auth_context *auth_context,
 625                                        const krb5_flags ap_req_options,
 626                                        const char *principal,
 627                                        krb5_ccache ccache,
 628                                        krb5_data *outbuf,
 629                                        time_t *expire_time)
 630 {
 631         krb5_error_code           retval;
 632         krb5_principal    server;
 633         krb5_creds              * credsp;
 634         krb5_creds                creds;
 635         krb5_data in_data;
 636         bool creds_ready = False;
 637         int i = 0, maxtries = 3;
 638
 639         retval = smb_krb5_parse_name(context, principal, &server);
 640         if (retval) {
 641                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 642                 return retval;
 643         }
 644
 645         /* obtain ticket & session key */
 646         ZERO_STRUCT(creds);
 647         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 648                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 649                          error_message(retval)));
 650                 goto cleanup_princ;
 651         }
 652
 653         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 654                 /* This can commonly fail on smbd startup with no ticket in the cache.
 655                  * Report at higher level than 1. */
 656                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 657                          error_message(retval)));
 658                 goto cleanup_creds;
 659         }
 660
 661         while (!creds_ready && (i < maxtries)) {
 662
 663                 if ((retval = krb5_get_credentials(context, 0, ccache,
 664                                                    &creds, &credsp))) {
 665                         DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
 666                                  principal, error_message(retval)));
 667                         goto cleanup_creds;
 668                 }
 669
 670                 /* cope with ticket being in the future due to clock skew */
 671                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 672                         time_t t = time(NULL);
 673                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 674                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 675                         krb5_set_real_time(context, t + time_offset + 1, 0);
 676                 }
 677
 678                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 679                         creds_ready = True;
 680                 }
 681
 682                 i++;
 683         }
 684
 685         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 686                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 687                   http_timestring((unsigned)credsp->times.endtime),
 688                   (unsigned)credsp->times.endtime));
 689
 690         if (expire_time) {
 691                 *expire_time = (time_t)credsp->times.endtime;
 692         }
 693
 694         in_data.length = 0;
 695         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 696                                       &in_data, credsp, outbuf);
 697         if (retval) {
 698                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 699                          error_message(retval)));
 700         }
 701
 702         krb5_free_creds(context, credsp);
 703
 704 cleanup_creds:
 705         krb5_free_cred_contents(context, &creds);
 706
 707 cleanup_princ:
 708         krb5_free_principal(context, server);
 709
 710         return retval;
 711 }
 712
 713 /*
 714   get a kerberos5 ticket for the given service
 715 */
 716 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
 717                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 718                         uint32 extra_ap_opts, const char *ccname,
 719                         time_t *tgs_expire)
 720
 721 {
 722         krb5_error_code retval;
 723         krb5_data packet;
 724         krb5_context context = NULL;
 725         krb5_ccache ccdef = NULL;
 726         krb5_auth_context auth_context = NULL;
 727         krb5_enctype enc_types[] = {
 728 #ifdef ENCTYPE_ARCFOUR_HMAC
 729                 ENCTYPE_ARCFOUR_HMAC,
 730 #endif
 731                 ENCTYPE_DES_CBC_MD5,
 732                 ENCTYPE_DES_CBC_CRC,
 733                 ENCTYPE_NULL};
 734
 735         initialize_krb5_error_table();
 736         retval = krb5_init_context(&context);
 737         if (retval) {
 738                 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
 739                          error_message(retval)));
 740                 goto failed;
 741         }
 742
 743         if (time_offset != 0) {
 744                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 745         }
 746
 747         if ((retval = krb5_cc_resolve(context, ccname ?
 748                         ccname : krb5_cc_default_name(context), &ccdef))) {
 749                 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
 750                          error_message(retval)));
 751                 goto failed;
 752         }
 753
 754         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 755                 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
 756                          error_message(retval)));
 757                 goto failed;
 758         }
 759
 760         if ((retval = ads_krb5_mk_req(context,
 761                                         &auth_context,
 762                                         AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 763                                         principal,
 764                                         ccdef, &packet,
 765                                         tgs_expire))) {
 766                 goto failed;
 767         }
 768
 769         get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
 770
 771         *ticket = data_blob(packet.data, packet.length);
 772
 773         kerberos_free_data_contents(context, &packet);
 774
 775 failed:
 776
 777         if ( context ) {
 778                 if (ccdef)
 779                         krb5_cc_close(context, ccdef);
 780                 if (auth_context)
 781                         krb5_auth_con_free(context, auth_context);
 782                 krb5_free_context(context);
 783         }
 784
 785         return retval;
 786 }
 787
 788  bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
 789  {
 790         krb5_keyblock *skey;
 791         krb5_error_code err;
 792         bool ret = False;
 793
 794         if (remote)
 795                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 796         else
 797                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 798         if (err == 0 && skey != NULL) {
 799                 DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
 800                 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 801                 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 802
 803                 ret = True;
 804
 805                 krb5_free_keyblock(context, skey);
 806         } else {
 807                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 808         }
 809
 810         return ret;
 811  }
 812
 813
 814 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 815  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 816
 817  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 818 {
 819         static krb5_data kdata;
 820
 821         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 822         kdata.length = strlen((const char *)kdata.data);
 823         return &kdata;
 824 }
 825 #endif
 826
 827  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 828 {
 829 #if defined(HAVE_KRB5_KT_FREE_ENTRY)
 830         return krb5_kt_free_entry(context, kt_entry);
 831 #elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 832         return krb5_free_keytab_entry_contents(context, kt_entry);
 833 #else
 834 #error UNKNOWN_KT_FREE_FUNCTION
 835 #endif
 836 }
 837
 838  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 839                                      struct PAC_SIGNATURE_DATA *sig)
 840 {
 841 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 842         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 843         cksum->checksum.length  = sig->signature.length;
 844         cksum->checksum.data    = sig->signature.data;
 845 #else
 846         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 847         cksum->length           = sig->signature.length;
 848         cksum->contents         = sig->signature.data;
 849 #endif
 850 }
 851
 852  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 853                                           const krb5_keyblock *keyblock,
 854                                          krb5_keyusage usage,
 855                                          krb5_checksum *cksum,
 856                                          uint8 *data,
 857                                          size_t length)
 858 {
 859         krb5_error_code ret;
 860
 861         /* verify the checksum */
 862
 863         /* welcome to the wonderful world of samba's kerberos abstraction layer:
 864          *
 865          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
 866          * -----------------------------------------------------------------------------
 867          * krb5_c_verify_checksum       -                       works           works
 868          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
 869          */
 870
 871 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
 872         {
 873                 krb5_boolean checksum_valid = False;
 874                 krb5_data input;
 875
 876                 input.data = (char *)data;
 877                 input.length = length;
 878
 879                 ret = krb5_c_verify_checksum(context,
 880                                              keyblock,
 881                                              usage,
 882                                              &input,
 883                                              cksum,
 884                                              &checksum_valid);
 885                 if (ret) {
 886                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
 887                                 error_message(ret)));
 888                         return ret;
 889                 }
 890
 891                 if (!checksum_valid)
 892                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
 893         }
 894
 895 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
 896
 897         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
 898          * without enctype and it ignores any key_usage types - Guenther */
 899
 900         {
 901
 902                 krb5_crypto crypto;
 903                 ret = krb5_crypto_init(context,
 904                                        keyblock,
 905                                        0,
 906                                        &crypto);
 907                 if (ret) {
 908                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
 909                                 error_message(ret)));
 910                         return ret;
 911                 }
 912
 913                 ret = krb5_verify_checksum(context,
 914                                            crypto,
 915                                            usage,
 916                                            data,
 917                                            length,
 918                                            cksum);
 919
 920                 krb5_crypto_destroy(context, crypto);
 921         }
 922
 923 #else
 924 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
 925 #endif
 926
 927         return ret;
 928 }
 929
 930  time_t get_authtime_from_tkt(krb5_ticket *tkt)
 931 {
 932 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 933         return tkt->enc_part2->times.authtime;
 934 #else
 935         return tkt->ticket.authtime;
 936 #endif
 937 }
 938
 939 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
 940 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
 941 {
 942 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
 943         if (ap_req->ticket->enc_part.kvno)
 944                 return ap_req->ticket->enc_part.kvno;
 945 #else /* Heimdal */
 946         if (ap_req->ticket.enc_part.kvno)
 947                 return *ap_req->ticket.enc_part.kvno;
 948 #endif
 949         return 0;
 950 }
 951
 952 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
 953 {
 954 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
 955         return ap_req->ticket.enc_part.etype;
 956 #else /* MIT */
 957         return ap_req->ticket->enc_part.enctype;
 958 #endif
 959 }
 960 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
 961
 962 static krb5_error_code
 963 get_key_from_keytab(krb5_context context,
 964                     krb5_const_principal server,
 965                     krb5_enctype enctype,
 966                     krb5_kvno kvno,
 967                     krb5_keyblock **out_key)
 968 {
 969         krb5_keytab_entry entry;
 970         krb5_error_code ret;
 971         krb5_keytab keytab;
 972         char *name = NULL;
 973
 974         /* We have to open a new keytab handle here, as MIT does
 975            an implicit open/getnext/close on krb5_kt_get_entry. We
 976            may be in the middle of a keytab enumeration when this is
 977            called. JRA. */
 978
 979         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
 980         if (ret) {
 981                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 982                 return ret;
 983         }
 984
 985         if ( DEBUGLEVEL >= 10 ) {
 986                 if (smb_krb5_unparse_name(context, server, &name) == 0) {
 987                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
 988                                 kvno, enctype, name));
 989                         SAFE_FREE(name);
 990                 }
 991         }
 992
 993         ret = krb5_kt_get_entry(context,
 994                                 keytab,
 995                                 server,
 996                                 kvno,
 997                                 enctype,
 998                                 &entry);
 999
1000         if (ret) {
1001                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1002                 goto out;
1003         }
1004
1005 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */
1006         ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
1007 #elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) /* MIT */
1008         ret = krb5_copy_keyblock(context, &entry.key, out_key);
1009 #else
1010 #error UNKNOWN_KRB5_KEYTAB_ENTRY_FORMAT
1011 #endif
1012
1013         if (ret) {
1014                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1015                 goto out;
1016         }
1017
1018         smb_krb5_kt_free_entry(context, &entry);
1019
1020 out:
1021         krb5_kt_close(context, keytab);
1022         return ret;
1023 }
1024
1025 /* Prototypes */
1026
1027  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1028                                                  const krb5_data *inbuf,
1029                                                  krb5_kvno *kvno,
1030                                                  krb5_enctype *enctype)
1031 {
1032 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1033         {
1034                 krb5_error_code ret;
1035                 krb5_ap_req ap_req;
1036
1037                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1038                 if (ret)
1039                         return ret;
1040
1041                 *kvno = get_kvno_from_ap_req(&ap_req);
1042                 *enctype = get_enctype_from_ap_req(&ap_req);
1043
1044                 free_AP_REQ(&ap_req);
1045                 return 0;
1046         }
1047 #endif
1048
1049         /* Possibly not an appropriate error code. */
1050         return KRB5KDC_ERR_BADOPTION;
1051 }
1052
1053  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1054                                                         krb5_auth_context *auth_context,
1055                                                         const krb5_data *inbuf,
1056                                                         krb5_const_principal server,
1057                                                         krb5_keytab keytab,
1058                                                         krb5_flags *ap_req_options,
1059                                                         krb5_ticket **ticket,
1060                                                         krb5_keyblock **keyblock)
1061 {
1062         krb5_error_code ret;
1063         krb5_kvno kvno;
1064         krb5_enctype enctype;
1065         krb5_keyblock *local_keyblock;
1066
1067         ret = krb5_rd_req(context,
1068                           auth_context,
1069                           inbuf,
1070                           server,
1071                           keytab,
1072                           ap_req_options,
1073                           ticket);
1074         if (ret) {
1075                 return ret;
1076         }
1077
1078 #ifdef KRB5_TICKET_HAS_KEYINFO
1079         enctype = (*ticket)->enc_part.enctype;
1080         kvno = (*ticket)->enc_part.kvno;
1081 #else
1082         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1083         if (ret) {
1084                 return ret;
1085         }
1086 #endif
1087
1088         ret = get_key_from_keytab(context,
1089                                   server,
1090                                   enctype,
1091                                   kvno,
1092                                   &local_keyblock);
1093         if (ret) {
1094                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1095                 goto out;
1096         }
1097
1098 out:
1099         if (ret && local_keyblock != NULL) {
1100                 krb5_free_keyblock(context, local_keyblock);
1101         } else {
1102                 *keyblock = local_keyblock;
1103         }
1104
1105         return ret;
1106 }
1107
1108  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1109                                             const char *name,
1110                                             krb5_principal *principal)
1111 {
1112 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1113         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1114 #endif
1115
1116         /* we are cheating here because parse_name will in fact set the realm.
1117          * We don't care as the only caller of smb_krb5_parse_name_norealm
1118          * ignores the realm anyway when calling
1119          * smb_krb5_principal_compare_any_realm later - Guenther */
1120
1121         return smb_krb5_parse_name(context, name, principal);
1122 }
1123
1124  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1125                                           krb5_const_principal princ1,
1126                                           krb5_const_principal princ2)
1127 {
1128 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1129
1130         return krb5_principal_compare_any_realm(context, princ1, princ2);
1131
1132 /* krb5_princ_size is a macro in MIT */
1133 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1134
1135         int i, len1, len2;
1136         const krb5_data *p1, *p2;
1137
1138         len1 = krb5_princ_size(context, princ1);
1139         len2 = krb5_princ_size(context, princ2);
1140
1141         if (len1 != len2)
1142                 return False;
1143
1144         for (i = 0; i < len1; i++) {
1145
1146                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1147                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1148
1149                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1150                         return False;
1151         }
1152
1153         return True;
1154 #else
1155 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1156 #endif
1157 }
1158
1159  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1160                                        const char *client_string,       /* gd@BER.SUSE.DE */
1161                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1162                                        time_t *expire_time)
1163 {
1164         krb5_error_code ret;
1165         krb5_context context = NULL;
1166         krb5_ccache ccache = NULL;
1167         krb5_principal client = NULL;
1168         krb5_creds creds, creds_in, *creds_out = NULL;
1169
1170         ZERO_STRUCT(creds);
1171         ZERO_STRUCT(creds_in);
1172
1173         initialize_krb5_error_table();
1174         ret = krb5_init_context(&context);
1175         if (ret) {
1176                 goto done;
1177         }
1178
1179         if (!ccache_string) {
1180                 ccache_string = krb5_cc_default_name(context);
1181         }
1182
1183         if (!ccache_string) {
1184                 ret = EINVAL;
1185                 goto done;
1186         }
1187
1188         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1189
1190         /* FIXME: we should not fall back to defaults */
1191         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1192         if (ret) {
1193                 goto done;
1194         }
1195
1196         if (client_string) {
1197                 ret = smb_krb5_parse_name(context, client_string, &client);
1198                 if (ret) {
1199                         goto done;
1200                 }
1201         } else {
1202                 ret = krb5_cc_get_principal(context, ccache, &client);
1203                 if (ret) {
1204                         goto done;
1205                 }
1206         }
1207
1208 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1209         {
1210                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1211                 if (ret) {
1212                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1213                         goto done;
1214                 }
1215         }
1216 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1217         {
1218                 krb5_kdc_flags flags;
1219                 krb5_realm *client_realm = NULL;
1220
1221                 ret = krb5_copy_principal(context, client, &creds_in.client);
1222                 if (ret) {
1223                         goto done;
1224                 }
1225
1226                 if (service_string) {
1227                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1228                         if (ret) {
1229                                 goto done;
1230                         }
1231                 } else {
1232                         /* build tgt service by default */
1233                         client_realm = krb5_princ_realm(context, creds_in.client);
1234                         if (!client_realm) {
1235                                 ret = ENOMEM;
1236                                 goto done;
1237                         }
1238                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1239                         if (ret) {
1240                                 goto done;
1241                         }
1242                 }
1243
1244                 flags.i = 0;
1245                 flags.b.renewable = flags.b.renew = True;
1246
1247                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1248                 if (ret) {
1249                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1250                         goto done;
1251                 }
1252
1253                 creds = *creds_out;
1254         }
1255 #else
1256 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1257 #endif
1258
1259         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1260         ret = krb5_cc_initialize(context, ccache, client);
1261         if (ret) {
1262                 goto done;
1263         }
1264
1265         ret = krb5_cc_store_cred(context, ccache, &creds);
1266
1267         if (expire_time) {
1268                 *expire_time = (time_t) creds.times.endtime;
1269         }
1270
1271 done:
1272         krb5_free_cred_contents(context, &creds_in);
1273
1274         if (creds_out) {
1275                 krb5_free_creds(context, creds_out);
1276         } else {
1277                 krb5_free_cred_contents(context, &creds);
1278         }
1279
1280         if (client) {
1281                 krb5_free_principal(context, client);
1282         }
1283         if (ccache) {
1284                 krb5_cc_close(context, ccache);
1285         }
1286         if (context) {
1287                 krb5_free_context(context);
1288         }
1289
1290         return ret;
1291 }
1292
1293  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1294 {
1295         krb5_error_code ret = 0;
1296         if (addr == NULL) {
1297                 return ret;
1298         }
1299 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1300         krb5_free_addresses(context, addr->addrs);
1301 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1302         ret = krb5_free_addresses(context, addr->addrs);
1303         SAFE_FREE(addr->addrs);
1304 #endif
1305         SAFE_FREE(addr);
1306         addr = NULL;
1307         return ret;
1308 }
1309
1310  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1311 {
1312         krb5_error_code ret = 0;
1313         nstring buf;
1314 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1315         krb5_address **addrs = NULL;
1316 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1317         krb5_addresses *addrs = NULL;
1318 #endif
1319
1320         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1321         if (*kerb_addr == NULL) {
1322                 return ENOMEM;
1323         }
1324
1325         put_name(buf, global_myname(), ' ', 0x20);
1326
1327 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1328         {
1329                 int num_addr = 2;
1330
1331                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1332                 if (addrs == NULL) {
1333                         SAFE_FREE(kerb_addr);
1334                         return ENOMEM;
1335                 }
1336
1337                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1338
1339                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1340                 if (addrs[0] == NULL) {
1341                         SAFE_FREE(addrs);
1342                         SAFE_FREE(kerb_addr);
1343                         return ENOMEM;
1344                 }
1345
1346                 addrs[0]->magic = KV5M_ADDRESS;
1347                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1348                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1349                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1350                 if (addrs[0]->contents == NULL) {
1351                         SAFE_FREE(addrs[0]);
1352                         SAFE_FREE(addrs);
1353                         SAFE_FREE(kerb_addr);
1354                         return ENOMEM;
1355                 }
1356
1357                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1358
1359                 addrs[1] = NULL;
1360         }
1361 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1362         {
1363                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1364                 if (addrs == NULL) {
1365                         SAFE_FREE(kerb_addr);
1366                         return ENOMEM;
1367                 }
1368
1369                 memset(addrs, 0, sizeof(krb5_addresses));
1370
1371                 addrs->len = 1;
1372                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1373                 if (addrs->val == NULL) {
1374                         SAFE_FREE(addrs);
1375                         SAFE_FREE(kerb_addr);
1376                         return ENOMEM;
1377                 }
1378
1379                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1380                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1381                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1382                 if (addrs->val[0].address.data == NULL) {
1383                         SAFE_FREE(addrs->val);
1384                         SAFE_FREE(addrs);
1385                         SAFE_FREE(kerb_addr);
1386                         return ENOMEM;
1387                 }
1388
1389                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1390         }
1391 #else
1392 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1393 #endif
1394         (*kerb_addr)->addrs = addrs;
1395
1396         return ret;
1397 }
1398
1399  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1400 {
1401 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1402         krb5_free_error_contents(context, krberror);
1403 #else /* MIT */
1404         krb5_free_error(context, krberror);
1405 #endif
1406 }
1407
1408  krb5_error_code handle_krberror_packet(krb5_context context,
1409                                         krb5_data *packet)
1410 {
1411         krb5_error_code ret;
1412         bool got_error_code = False;
1413
1414         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1415
1416 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1417         {
1418                 krb5_error krberror;
1419
1420                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1421                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1422                                 error_message(ret)));
1423                         return ret;
1424                 }
1425
1426                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1427                         ret = (krb5_error_code) krberror.error_code;
1428                         got_error_code = True;
1429                 }
1430
1431                 smb_krb5_free_error(context, &krberror);
1432         }
1433 #else /* MIT */
1434         {
1435                 krb5_error *krberror;
1436
1437                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1438                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1439                                 error_message(ret)));
1440                         return ret;
1441                 }
1442
1443                 if (krberror->e_data.data == NULL) {
1444                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1445                         got_error_code = True;
1446                 }
1447                 smb_krb5_free_error(context, krberror);
1448         }
1449 #endif
1450         if (got_error_code) {
1451                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1452                         error_message(ret), ret));
1453         }
1454         return ret;
1455 }
1456
1457  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1458                                             krb5_get_init_creds_opt **opt)
1459 {
1460 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1461         /* Heimdal or modern MIT version */
1462         return krb5_get_init_creds_opt_alloc(context, opt);
1463 #else
1464         /* Historical MIT version */
1465         krb5_get_init_creds_opt *my_opt;
1466
1467         *opt = NULL;
1468
1469         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1470                 return ENOMEM;
1471         }
1472
1473         krb5_get_init_creds_opt_init(my_opt);
1474
1475         *opt =  my_opt;
1476         return 0;
1477 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1478 }
1479
1480  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1481                                 krb5_get_init_creds_opt *opt)
1482 {
1483 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1484
1485 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1486         /* Modern MIT or Heimdal version */
1487         krb5_get_init_creds_opt_free(context, opt);
1488 #else
1489         /* Heimdal version */
1490         krb5_get_init_creds_opt_free(opt);
1491 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1492
1493 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1494         /* Historical MIT version */
1495         SAFE_FREE(opt);
1496         opt = NULL;
1497 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1498 }
1499
1500  krb5_enctype smb_get_enctype_from_kt_entry(const krb5_keytab_entry *kt_entry)
1501 {
1502 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY               /* MIT */
1503         return kt_entry->key.enctype;
1504 #elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK)  /* Heimdal */
1505         return kt_entry->keyblock.keytype;
1506 #else
1507 #error UNKNOWN_KRB5_KEYTAB_ENTRY_KEYBLOCK_FORMAT
1508 #endif
1509 }
1510
1511
1512 /* caller needs to free etype_s */
1513  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1514                                             krb5_enctype enctype,
1515                                             char **etype_s)
1516 {
1517 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1518         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1519 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1520         char buf[256];
1521         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1522         if (ret) {
1523                 return ret;
1524         }
1525         *etype_s = SMB_STRDUP(buf);
1526         if (!*etype_s) {
1527                 return ENOMEM;
1528         }
1529         return ret;
1530 #else
1531 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1532 #endif
1533 }
1534
1535  krb5_error_code smb_krb5_mk_error(krb5_context context,
1536                                 krb5_error_code error_code,
1537                                 const krb5_principal server,
1538                                 krb5_data *reply)
1539 {
1540 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1541         /*
1542          * The MIT interface is *terrible*.
1543          * We have to construct this ourselves...
1544          */
1545         krb5_error e;
1546
1547         memset(&e, 0, sizeof(e));
1548         krb5_us_timeofday(context, &e.stime, &e.susec);
1549         e.server = server;
1550 #if defined(krb5_err_base)
1551         e.error = error_code - krb5_err_base;
1552 #elif defined(ERROR_TABLE_BASE_krb5)
1553         e.error = error_code - ERROR_TABLE_BASE_krb5;
1554 #else
1555         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1556 #endif
1557
1558         return krb5_mk_error(context, &e, reply);
1559 #else /* Heimdal. */
1560         return krb5_mk_error(context,
1561                                 error_code,
1562                                 NULL,
1563                                 NULL, /* e_data */
1564                                 NULL,
1565                                 server,
1566                                 NULL,
1567                                 NULL,
1568                                 reply);
1569 #endif
1570 }
1571
1572 /**********************************************************************
1573  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1574  * allows to process non-default keytab names.
1575  * @param context krb5_context
1576  * @param keytab_name_req string
1577  * @param write_access bool if writable keytab is required
1578  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1579  * @return krb5_error_code
1580 **********************************************************************/
1581
1582 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1583 #ifndef MAX_KEYTAB_NAME_LEN
1584 #define MAX_KEYTAB_NAME_LEN 1100
1585 #endif
1586
1587  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1588                                       const char *keytab_name_req,
1589                                       bool write_access,
1590                                       krb5_keytab *keytab)
1591 {
1592         krb5_error_code ret = 0;
1593         TALLOC_CTX *mem_ctx;
1594         char keytab_string[MAX_KEYTAB_NAME_LEN];
1595         char *kt_str = NULL;
1596         bool found_valid_name = False;
1597         const char *pragma = "FILE";
1598         const char *tmp = NULL;
1599
1600         if (!write_access && !keytab_name_req) {
1601                 /* caller just wants to read the default keytab readonly, so be it */
1602                 return krb5_kt_default(context, keytab);
1603         }
1604
1605         mem_ctx = talloc_init("smb_krb5_open_keytab");
1606         if (!mem_ctx) {
1607                 return ENOMEM;
1608         }
1609
1610 #ifdef HAVE_WRFILE_KEYTAB
1611         if (write_access) {
1612                 pragma = "WRFILE";
1613         }
1614 #endif
1615
1616         if (keytab_name_req) {
1617
1618                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1619                         ret = KRB5_CONFIG_NOTENUFSPACE;
1620                         goto out;
1621                 }
1622
1623                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1624                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1625                         tmp = keytab_name_req;
1626                         goto resolve;
1627                 }
1628
1629                 if (keytab_name_req[0] != '/') {
1630                         ret = KRB5_KT_BADNAME;
1631                         goto out;
1632                 }
1633
1634                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1635                 if (!tmp) {
1636                         ret = ENOMEM;
1637                         goto out;
1638                 }
1639
1640                 goto resolve;
1641         }
1642
1643         /* we need to handle more complex keytab_strings, like:
1644          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1645
1646         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1647         if (ret) {
1648                 goto out;
1649         }
1650
1651         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1652
1653         tmp = talloc_strdup(mem_ctx, keytab_string);
1654         if (!tmp) {
1655                 ret = ENOMEM;
1656                 goto out;
1657         }
1658
1659         if (strncmp(tmp, "ANY:", 4) == 0) {
1660                 tmp += 4;
1661         }
1662
1663         memset(&keytab_string, '\0', sizeof(keytab_string));
1664
1665         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1666                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1667                         found_valid_name = True;
1668                         tmp = kt_str;
1669                         tmp += 7;
1670                 }
1671
1672                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1673                         found_valid_name = True;
1674                         tmp = kt_str;
1675                         tmp += 5;
1676                 }
1677
1678                 if (found_valid_name) {
1679                         if (tmp[0] != '/') {
1680                                 ret = KRB5_KT_BADNAME;
1681                                 goto out;
1682                         }
1683
1684                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1685                         if (!tmp) {
1686                                 ret = ENOMEM;
1687                                 goto out;
1688                         }
1689                         break;
1690                 }
1691         }
1692
1693         if (!found_valid_name) {
1694                 ret = KRB5_KT_UNKNOWN_TYPE;
1695                 goto out;
1696         }
1697
1698  resolve:
1699         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1700         ret = krb5_kt_resolve(context, tmp, keytab);
1701
1702  out:
1703         TALLOC_FREE(mem_ctx);
1704         return ret;
1705 }
1706
1707 #else /* HAVE_KRB5 */
1708  /* this saves a few linking headaches */
1709  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1710                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1711                         const char *ccname, time_t *tgs_expire)
1712 {
1713          DEBUG(0,("NO KERBEROS SUPPORT\n"));
1714          return 1;
1715 }
1716
1717 #endif