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 #define KRB5_KEY_DATA_CAST      void
  35 #else /* MIT */
  36 #define KRB5_KEY_TYPE(k)        ((k)->enctype)
  37 #define KRB5_KEY_LENGTH(k)      ((k)->length)
  38 #define KRB5_KEY_DATA(k)        ((k)->contents)
  39 #define KRB5_KEY_DATA_CAST      krb5_octet
  40 #endif /* HAVE_KRB5_KEYBLOCK_KEYVALUE */
  41
  42 /**************************************************************
  43  Wrappers around kerberos string functions that convert from
  44  utf8 -> unix charset and vica versa.
  45 **************************************************************/
  46
  47 /**************************************************************
  48  krb5_parse_name that takes a UNIX charset.
  49 **************************************************************/
  50
  51  krb5_error_code smb_krb5_parse_name(krb5_context context,
  52                                 const char *name, /* in unix charset */
  53                                 krb5_principal *principal)
  54 {
  55         krb5_error_code ret;
  56         char *utf8_name;
  57         size_t converted_size;
  58
  59         if (!push_utf8_allocate(&utf8_name, name, &converted_size)) {
  60                 return ENOMEM;
  61         }
  62
  63         ret = krb5_parse_name(context, utf8_name, principal);
  64         SAFE_FREE(utf8_name);
  65         return ret;
  66 }
  67
  68 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
  69 /**************************************************************
  70  krb5_parse_name_norealm that takes a UNIX charset.
  71 **************************************************************/
  72
  73 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
  74                                 const char *name, /* in unix charset */
  75                                 krb5_principal *principal)
  76 {
  77         krb5_error_code ret;
  78         char *utf8_name;
  79         size_t converted_size;
  80
  81         *principal = NULL;
  82         if (!push_utf8_allocate(&utf8_name, name, &converted_size)) {
  83                 return ENOMEM;
  84         }
  85
  86         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  87         SAFE_FREE(utf8_name);
  88         return ret;
  89 }
  90 #endif
  91
  92 /**************************************************************
  93  krb5_parse_name that returns a UNIX charset name. Must
  94  be freed with normal free() call.
  95 **************************************************************/
  96
  97  krb5_error_code smb_krb5_unparse_name(krb5_context context,
  98                                         krb5_const_principal principal,
  99                                         char **unix_name)
 100 {
 101         krb5_error_code ret;
 102         char *utf8_name;
 103         size_t converted_size;
 104
 105         *unix_name = NULL;
 106         ret = krb5_unparse_name(context, principal, &utf8_name);
 107         if (ret) {
 108                 return ret;
 109         }
 110
 111         if (!pull_utf8_allocate(unix_name, utf8_name, &converted_size)) {
 112                 krb5_free_unparsed_name(context, utf8_name);
 113                 return ENOMEM;
 114         }
 115         krb5_free_unparsed_name(context, utf8_name);
 116         return 0;
 117 }
 118
 119 #ifndef HAVE_KRB5_SET_REAL_TIME
 120 /*
 121  * This function is not in the Heimdal mainline.
 122  */
 123  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 124 {
 125         krb5_error_code ret;
 126         int32_t sec, usec;
 127
 128         ret = krb5_us_timeofday(context, &sec, &usec);
 129         if (ret)
 130                 return ret;
 131
 132         context->kdc_sec_offset = seconds - sec;
 133         context->kdc_usec_offset = microseconds - usec;
 134
 135         return 0;
 136 }
 137 #endif
 138
 139 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 140
 141 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 142
 143 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 144  * to krb5_set_default_tgs_ktypes. See
 145  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 146  *
 147  * If the MIT libraries are not exporting internal symbols, we will end up in
 148  * this branch, which is correct. Otherwise we will continue to use the
 149  * internal symbol
 150  */
 151  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 152 {
 153     return krb5_set_default_tgs_enctypes(ctx, enc);
 154 }
 155
 156 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 157
 158 /* Heimdal */
 159  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 160 {
 161         return krb5_set_default_in_tkt_etypes(ctx, enc);
 162 }
 163
 164 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 165
 166 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 167
 168 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 169 /* HEIMDAL */
 170  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 171 {
 172         memset(pkaddr, '\0', sizeof(krb5_address));
 173 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 174         if (paddr->ss_family == AF_INET6) {
 175                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 176                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 177                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 178                 return true;
 179         }
 180 #endif
 181         if (paddr->ss_family == AF_INET) {
 182                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 183                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 184                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 185                 return true;
 186         }
 187         return false;
 188 }
 189 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 190 /* MIT */
 191  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 192 {
 193         memset(pkaddr, '\0', sizeof(krb5_address));
 194 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 195         if (paddr->ss_family == AF_INET6) {
 196                 pkaddr->addrtype = ADDRTYPE_INET6;
 197                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 198                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 199                 return true;
 200         }
 201 #endif
 202         if (paddr->ss_family == AF_INET) {
 203                 pkaddr->addrtype = ADDRTYPE_INET;
 204                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 205                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 206                 return true;
 207         }
 208         return false;
 209 }
 210 #else
 211 #error UNKNOWN_ADDRTYPE
 212 #endif
 213
 214 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 215 static int create_kerberos_key_from_string_direct(krb5_context context,
 216                                                   krb5_principal host_princ,
 217                                                   krb5_data *password,
 218                                                   krb5_keyblock *key,
 219                                                   krb5_enctype enctype)
 220 {
 221         int ret = 0;
 222         krb5_data salt;
 223         krb5_encrypt_block eblock;
 224
 225         ret = krb5_principal2salt(context, host_princ, &salt);
 226         if (ret) {
 227                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 228                 return ret;
 229         }
 230         krb5_use_enctype(context, &eblock, enctype);
 231         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 232         SAFE_FREE(salt.data);
 233
 234         return ret;
 235 }
 236 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 237 static int create_kerberos_key_from_string_direct(krb5_context context,
 238                                                   krb5_principal host_princ,
 239                                                   krb5_data *password,
 240                                                   krb5_keyblock *key,
 241                                                   krb5_enctype enctype)
 242 {
 243         int ret;
 244         krb5_salt salt;
 245
 246         ret = krb5_get_pw_salt(context, host_princ, &salt);
 247         if (ret) {
 248                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 249                 return ret;
 250         }
 251
 252         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 253         krb5_free_salt(context, salt);
 254
 255         return ret;
 256 }
 257 #else
 258 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 259 #endif
 260
 261  int create_kerberos_key_from_string(krb5_context context,
 262                                         krb5_principal host_princ,
 263                                         krb5_data *password,
 264                                         krb5_keyblock *key,
 265                                         krb5_enctype enctype,
 266                                         bool no_salt)
 267 {
 268         krb5_principal salt_princ = NULL;
 269         int ret;
 270         /*
 271          * Check if we've determined that the KDC is salting keys for this
 272          * principal/enctype in a non-obvious way.  If it is, try to match
 273          * its behavior.
 274          */
 275         if (no_salt) {
 276                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 277                 if (!KRB5_KEY_DATA(key)) {
 278                         return ENOMEM;
 279                 }
 280                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 281                 KRB5_KEY_LENGTH(key) = password->length;
 282                 KRB5_KEY_TYPE(key) = enctype;
 283                 return 0;
 284         }
 285         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 286         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 287         if (salt_princ) {
 288                 krb5_free_principal(context, salt_princ);
 289         }
 290         return ret;
 291 }
 292
 293 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 294  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 295                                             krb5_enctype **enctypes)
 296 {
 297         return krb5_get_permitted_enctypes(context, enctypes);
 298 }
 299 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 300  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 301                                             krb5_enctype **enctypes)
 302 {
 303         return krb5_get_default_in_tkt_etypes(context, enctypes);
 304 }
 305 #else
 306 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 307 #endif
 308
 309 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 310  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 311                                         krb5_auth_context auth_context,
 312                                         krb5_keyblock *keyblock)
 313 {
 314         return krb5_auth_con_setkey(context, auth_context, keyblock);
 315 }
 316 #endif
 317
 318 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 319                            DATA_BLOB *edata,
 320                            DATA_BLOB *edata_out)
 321 {
 322         DATA_BLOB edata_contents;
 323         ASN1_DATA data;
 324         int edata_type;
 325
 326         if (!edata->length) {
 327                 return False;
 328         }
 329
 330         asn1_load(&data, *edata);
 331         asn1_start_tag(&data, ASN1_SEQUENCE(0));
 332         asn1_start_tag(&data, ASN1_CONTEXT(1));
 333         asn1_read_Integer(&data, &edata_type);
 334
 335         if (edata_type != KRB5_PADATA_PW_SALT) {
 336                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 337                         KRB5_PADATA_PW_SALT, edata_type));
 338                 asn1_free(&data);
 339                 return False;
 340         }
 341
 342         asn1_start_tag(&data, ASN1_CONTEXT(2));
 343         asn1_read_OctetString(&data, &edata_contents);
 344         asn1_end_tag(&data);
 345         asn1_end_tag(&data);
 346         asn1_end_tag(&data);
 347         asn1_free(&data);
 348
 349         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 350
 351         data_blob_free(&edata_contents);
 352
 353         return True;
 354 }
 355
 356
 357 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 358 {
 359         DATA_BLOB pac_contents;
 360         ASN1_DATA data;
 361         int data_type;
 362
 363         if (!auth_data->length) {
 364                 return False;
 365         }
 366
 367         asn1_load(&data, *auth_data);
 368         asn1_start_tag(&data, ASN1_SEQUENCE(0));
 369         asn1_start_tag(&data, ASN1_SEQUENCE(0));
 370         asn1_start_tag(&data, ASN1_CONTEXT(0));
 371         asn1_read_Integer(&data, &data_type);
 372
 373         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 374                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 375                 asn1_free(&data);
 376                 return False;
 377         }
 378
 379         asn1_end_tag(&data);
 380         asn1_start_tag(&data, ASN1_CONTEXT(1));
 381         asn1_read_OctetString(&data, &pac_contents);
 382         asn1_end_tag(&data);
 383         asn1_end_tag(&data);
 384         asn1_end_tag(&data);
 385         asn1_free(&data);
 386
 387         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 388
 389         data_blob_free(&pac_contents);
 390
 391         return True;
 392 }
 393
 394  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 395 {
 396         DATA_BLOB auth_data_wrapped;
 397         bool got_auth_data_pac = False;
 398         int i;
 399
 400 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 401         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 402             tkt->enc_part2->authorization_data[0] &&
 403             tkt->enc_part2->authorization_data[0]->length)
 404         {
 405                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 406
 407                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 408                             KRB5_AUTHDATA_IF_RELEVANT) {
 409                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 410                                         tkt->enc_part2->authorization_data[i]->ad_type));
 411                                 continue;
 412                         }
 413
 414                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 415                                                       tkt->enc_part2->authorization_data[i]->length);
 416
 417                         /* check if it is a PAC */
 418                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 419                         data_blob_free(&auth_data_wrapped);
 420
 421                         if (got_auth_data_pac) {
 422                                 return true;
 423                         }
 424                 }
 425
 426                 return got_auth_data_pac;
 427         }
 428
 429 #else
 430         if (tkt->ticket.authorization_data &&
 431             tkt->ticket.authorization_data->len)
 432         {
 433                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 434
 435                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 436                             KRB5_AUTHDATA_IF_RELEVANT) {
 437                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 438                                         tkt->ticket.authorization_data->val[i].ad_type));
 439                                 continue;
 440                         }
 441
 442                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 443                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 444
 445                         /* check if it is a PAC */
 446                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 447                         data_blob_free(&auth_data_wrapped);
 448
 449                         if (got_auth_data_pac) {
 450                                 return true;
 451                         }
 452                 }
 453
 454                 return got_auth_data_pac;
 455         }
 456 #endif
 457         return False;
 458 }
 459
 460  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 461 {
 462 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 463         return tkt->enc_part2->client;
 464 #else
 465         return tkt->client;
 466 #endif
 467 }
 468
 469 #if !defined(HAVE_KRB5_LOCATE_KDC)
 470
 471 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 472  * to a public interface for this functionality, so we have to be able to live
 473  * without it if the MIT libraries are hiding their internal symbols.
 474  */
 475
 476 #if defined(KRB5_KRBHST_INIT)
 477 /* Heimdal */
 478  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 479 {
 480         krb5_krbhst_handle hnd;
 481         krb5_krbhst_info *hinfo;
 482         krb5_error_code rc;
 483         int num_kdcs, i;
 484         struct sockaddr *sa;
 485         struct addrinfo *ai;
 486
 487         *addr_pp = NULL;
 488         *naddrs = 0;
 489
 490         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 491         if (rc) {
 492                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 493                 return rc;
 494         }
 495
 496         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 497                 ;
 498
 499         krb5_krbhst_reset(ctx, hnd);
 500
 501         if (!num_kdcs) {
 502                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 503                 krb5_krbhst_free(ctx, hnd);
 504                 return -1;
 505         }
 506
 507         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 508         if (!sa) {
 509                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 510                 krb5_krbhst_free(ctx, hnd);
 511                 naddrs = 0;
 512                 return -1;
 513         }
 514
 515         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 516
 517         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 518
 519 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 520                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 521                 if (rc) {
 522                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 523                         continue;
 524                 }
 525 #endif
 526                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 527                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 528         }
 529
 530         krb5_krbhst_free(ctx, hnd);
 531
 532         *naddrs = num_kdcs;
 533         *addr_pp = sa;
 534         return 0;
 535 }
 536
 537 #else /* ! defined(KRB5_KRBHST_INIT) */
 538
 539  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 540                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 541 {
 542         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 543         return KRB5_KDC_UNREACH;
 544 }
 545
 546 #endif /* KRB5_KRBHST_INIT */
 547
 548 #else /* ! HAVE_KRB5_LOCATE_KDC */
 549
 550  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 551                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 552 {
 553         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 554 }
 555
 556 #endif /* HAVE_KRB5_LOCATE_KDC */
 557
 558 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 559  void krb5_free_unparsed_name(krb5_context context, char *val)
 560 {
 561         SAFE_FREE(val);
 562 }
 563 #endif
 564
 565  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 566 {
 567 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 568         if (pdata->data) {
 569                 krb5_free_data_contents(context, pdata);
 570         }
 571 #else
 572         SAFE_FREE(pdata->data);
 573 #endif
 574 }
 575
 576  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 577 {
 578 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 579         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 580 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 581         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 582 #else
 583 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 584 #endif
 585 }
 586
 587  bool kerberos_compatible_enctypes(krb5_context context,
 588                                   krb5_enctype enctype1,
 589                                   krb5_enctype enctype2)
 590 {
 591 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 592         krb5_boolean similar = 0;
 593
 594         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 595         return similar ? True : False;
 596 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 597         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 598 #endif
 599 }
 600
 601 static bool ads_cleanup_expired_creds(krb5_context context,
 602                                       krb5_ccache  ccache,
 603                                       krb5_creds  *credsp)
 604 {
 605         krb5_error_code retval;
 606         const char *cc_type = krb5_cc_get_type(context, ccache);
 607
 608         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 609                   cc_type, krb5_cc_get_name(context, ccache),
 610                   http_timestring(credsp->times.endtime)));
 611
 612         /* we will probably need new tickets if the current ones
 613            will expire within 10 seconds.
 614         */
 615         if (credsp->times.endtime >= (time(NULL) + 10))
 616                 return False;
 617
 618         /* heimdal won't remove creds from a file ccache, and
 619            perhaps we shouldn't anyway, since internally we
 620            use memory ccaches, and a FILE one probably means that
 621            we're using creds obtained outside of our exectuable
 622         */
 623         if (strequal(cc_type, "FILE")) {
 624                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 625                 return False;
 626         }
 627
 628         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 629         if (retval) {
 630                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 631                           error_message(retval)));
 632                 /* If we have an error in this, we want to display it,
 633                    but continue as though we deleted it */
 634         }
 635         return True;
 636 }
 637
 638 /*
 639   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 640 */
 641 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 642                                        krb5_auth_context *auth_context,
 643                                        const krb5_flags ap_req_options,
 644                                        const char *principal,
 645                                        krb5_ccache ccache,
 646                                        krb5_data *outbuf,
 647                                        time_t *expire_time)
 648 {
 649         krb5_error_code           retval;
 650         krb5_principal    server;
 651         krb5_creds              * credsp;
 652         krb5_creds                creds;
 653         krb5_data in_data;
 654         bool creds_ready = False;
 655         int i = 0, maxtries = 3;
 656
 657         retval = smb_krb5_parse_name(context, principal, &server);
 658         if (retval) {
 659                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 660                 return retval;
 661         }
 662
 663         /* obtain ticket & session key */
 664         ZERO_STRUCT(creds);
 665         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 666                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 667                          error_message(retval)));
 668                 goto cleanup_princ;
 669         }
 670
 671         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 672                 /* This can commonly fail on smbd startup with no ticket in the cache.
 673                  * Report at higher level than 1. */
 674                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 675                          error_message(retval)));
 676                 goto cleanup_creds;
 677         }
 678
 679         while (!creds_ready && (i < maxtries)) {
 680
 681                 if ((retval = krb5_get_credentials(context, 0, ccache,
 682                                                    &creds, &credsp))) {
 683                         DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
 684                                  principal, error_message(retval)));
 685                         goto cleanup_creds;
 686                 }
 687
 688                 /* cope with ticket being in the future due to clock skew */
 689                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 690                         time_t t = time(NULL);
 691                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 692                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 693                         krb5_set_real_time(context, t + time_offset + 1, 0);
 694                 }
 695
 696                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 697                         creds_ready = True;
 698                 }
 699
 700                 i++;
 701         }
 702
 703         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 704                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 705                   http_timestring((unsigned)credsp->times.endtime),
 706                   (unsigned)credsp->times.endtime));
 707
 708         if (expire_time) {
 709                 *expire_time = (time_t)credsp->times.endtime;
 710         }
 711
 712         in_data.length = 0;
 713         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 714                                       &in_data, credsp, outbuf);
 715         if (retval) {
 716                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 717                          error_message(retval)));
 718         }
 719
 720         krb5_free_creds(context, credsp);
 721
 722 cleanup_creds:
 723         krb5_free_cred_contents(context, &creds);
 724
 725 cleanup_princ:
 726         krb5_free_principal(context, server);
 727
 728         return retval;
 729 }
 730
 731 /*
 732   get a kerberos5 ticket for the given service
 733 */
 734 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
 735                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 736                         uint32 extra_ap_opts, const char *ccname,
 737                         time_t *tgs_expire)
 738
 739 {
 740         krb5_error_code retval;
 741         krb5_data packet;
 742         krb5_context context = NULL;
 743         krb5_ccache ccdef = NULL;
 744         krb5_auth_context auth_context = NULL;
 745         krb5_enctype enc_types[] = {
 746 #ifdef ENCTYPE_ARCFOUR_HMAC
 747                 ENCTYPE_ARCFOUR_HMAC,
 748 #endif
 749                 ENCTYPE_DES_CBC_MD5,
 750                 ENCTYPE_DES_CBC_CRC,
 751                 ENCTYPE_NULL};
 752
 753         initialize_krb5_error_table();
 754         retval = krb5_init_context(&context);
 755         if (retval) {
 756                 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
 757                          error_message(retval)));
 758                 goto failed;
 759         }
 760
 761         if (time_offset != 0) {
 762                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 763         }
 764
 765         if ((retval = krb5_cc_resolve(context, ccname ?
 766                         ccname : krb5_cc_default_name(context), &ccdef))) {
 767                 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
 768                          error_message(retval)));
 769                 goto failed;
 770         }
 771
 772         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 773                 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
 774                          error_message(retval)));
 775                 goto failed;
 776         }
 777
 778         if ((retval = ads_krb5_mk_req(context,
 779                                         &auth_context,
 780                                         AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 781                                         principal,
 782                                         ccdef, &packet,
 783                                         tgs_expire))) {
 784                 goto failed;
 785         }
 786
 787         get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
 788
 789         *ticket = data_blob(packet.data, packet.length);
 790
 791         kerberos_free_data_contents(context, &packet);
 792
 793 failed:
 794
 795         if ( context ) {
 796                 if (ccdef)
 797                         krb5_cc_close(context, ccdef);
 798                 if (auth_context)
 799                         krb5_auth_con_free(context, auth_context);
 800                 krb5_free_context(context);
 801         }
 802
 803         return retval;
 804 }
 805
 806  bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
 807  {
 808         krb5_keyblock *skey;
 809         krb5_error_code err;
 810         bool ret = False;
 811
 812         if (remote)
 813                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 814         else
 815                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 816         if (err == 0 && skey != NULL) {
 817                 DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
 818                 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 819                 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 820
 821                 ret = True;
 822
 823                 krb5_free_keyblock(context, skey);
 824         } else {
 825                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 826         }
 827
 828         return ret;
 829  }
 830
 831
 832 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 833  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 834
 835  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 836 {
 837         static krb5_data kdata;
 838
 839         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 840         kdata.length = strlen((const char *)kdata.data);
 841         return &kdata;
 842 }
 843 #endif
 844
 845  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 846 {
 847 #if defined(HAVE_KRB5_KT_FREE_ENTRY)
 848         return krb5_kt_free_entry(context, kt_entry);
 849 #elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 850         return krb5_free_keytab_entry_contents(context, kt_entry);
 851 #else
 852 #error UNKNOWN_KT_FREE_FUNCTION
 853 #endif
 854 }
 855
 856  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 857                                      struct PAC_SIGNATURE_DATA *sig)
 858 {
 859 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 860         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 861         cksum->checksum.length  = sig->signature.length;
 862         cksum->checksum.data    = sig->signature.data;
 863 #else
 864         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 865         cksum->length           = sig->signature.length;
 866         cksum->contents         = sig->signature.data;
 867 #endif
 868 }
 869
 870  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 871                                           const krb5_keyblock *keyblock,
 872                                          krb5_keyusage usage,
 873                                          krb5_checksum *cksum,
 874                                          uint8 *data,
 875                                          size_t length)
 876 {
 877         krb5_error_code ret;
 878
 879         /* verify the checksum */
 880
 881         /* welcome to the wonderful world of samba's kerberos abstraction layer:
 882          *
 883          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
 884          * -----------------------------------------------------------------------------
 885          * krb5_c_verify_checksum       -                       works           works
 886          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
 887          */
 888
 889 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
 890         {
 891                 krb5_boolean checksum_valid = False;
 892                 krb5_data input;
 893
 894                 input.data = (char *)data;
 895                 input.length = length;
 896
 897                 ret = krb5_c_verify_checksum(context,
 898                                              keyblock,
 899                                              usage,
 900                                              &input,
 901                                              cksum,
 902                                              &checksum_valid);
 903                 if (ret) {
 904                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
 905                                 error_message(ret)));
 906                         return ret;
 907                 }
 908
 909                 if (!checksum_valid)
 910                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
 911         }
 912
 913 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
 914
 915         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
 916          * without enctype and it ignores any key_usage types - Guenther */
 917
 918         {
 919
 920                 krb5_crypto crypto;
 921                 ret = krb5_crypto_init(context,
 922                                        keyblock,
 923                                        0,
 924                                        &crypto);
 925                 if (ret) {
 926                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
 927                                 error_message(ret)));
 928                         return ret;
 929                 }
 930
 931                 ret = krb5_verify_checksum(context,
 932                                            crypto,
 933                                            usage,
 934                                            data,
 935                                            length,
 936                                            cksum);
 937
 938                 krb5_crypto_destroy(context, crypto);
 939         }
 940
 941 #else
 942 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
 943 #endif
 944
 945         return ret;
 946 }
 947
 948  time_t get_authtime_from_tkt(krb5_ticket *tkt)
 949 {
 950 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 951         return tkt->enc_part2->times.authtime;
 952 #else
 953         return tkt->ticket.authtime;
 954 #endif
 955 }
 956
 957 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
 958 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
 959 {
 960 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
 961         if (ap_req->ticket->enc_part.kvno)
 962                 return ap_req->ticket->enc_part.kvno;
 963 #else /* Heimdal */
 964         if (ap_req->ticket.enc_part.kvno)
 965                 return *ap_req->ticket.enc_part.kvno;
 966 #endif
 967         return 0;
 968 }
 969
 970 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
 971 {
 972 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
 973         return ap_req->ticket.enc_part.etype;
 974 #else /* MIT */
 975         return ap_req->ticket->enc_part.enctype;
 976 #endif
 977 }
 978 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
 979
 980 static krb5_error_code
 981 get_key_from_keytab(krb5_context context,
 982                     krb5_const_principal server,
 983                     krb5_enctype enctype,
 984                     krb5_kvno kvno,
 985                     krb5_keyblock **out_key)
 986 {
 987         krb5_keytab_entry entry;
 988         krb5_error_code ret;
 989         krb5_keytab keytab;
 990         char *name = NULL;
 991
 992         /* We have to open a new keytab handle here, as MIT does
 993            an implicit open/getnext/close on krb5_kt_get_entry. We
 994            may be in the middle of a keytab enumeration when this is
 995            called. JRA. */
 996
 997         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
 998         if (ret) {
 999                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1000                 return ret;
1001         }
1002
1003         if ( DEBUGLEVEL >= 10 ) {
1004                 if (smb_krb5_unparse_name(context, server, &name) == 0) {
1005                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1006                                 kvno, enctype, name));
1007                         SAFE_FREE(name);
1008                 }
1009         }
1010
1011         ret = krb5_kt_get_entry(context,
1012                                 keytab,
1013                                 server,
1014                                 kvno,
1015                                 enctype,
1016                                 &entry);
1017
1018         if (ret) {
1019                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1020                 goto out;
1021         }
1022
1023 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */
1024         ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
1025 #elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) /* MIT */
1026         ret = krb5_copy_keyblock(context, &entry.key, out_key);
1027 #else
1028 #error UNKNOWN_KRB5_KEYTAB_ENTRY_FORMAT
1029 #endif
1030
1031         if (ret) {
1032                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1033                 goto out;
1034         }
1035
1036         smb_krb5_kt_free_entry(context, &entry);
1037
1038 out:
1039         krb5_kt_close(context, keytab);
1040         return ret;
1041 }
1042
1043 /* Prototypes */
1044
1045  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1046                                                  const krb5_data *inbuf,
1047                                                  krb5_kvno *kvno,
1048                                                  krb5_enctype *enctype)
1049 {
1050 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1051         {
1052                 krb5_error_code ret;
1053                 krb5_ap_req ap_req;
1054
1055                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1056                 if (ret)
1057                         return ret;
1058
1059                 *kvno = get_kvno_from_ap_req(&ap_req);
1060                 *enctype = get_enctype_from_ap_req(&ap_req);
1061
1062                 free_AP_REQ(&ap_req);
1063                 return 0;
1064         }
1065 #endif
1066
1067         /* Possibly not an appropriate error code. */
1068         return KRB5KDC_ERR_BADOPTION;
1069 }
1070
1071  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1072                                                         krb5_auth_context *auth_context,
1073                                                         const krb5_data *inbuf,
1074                                                         krb5_const_principal server,
1075                                                         krb5_keytab keytab,
1076                                                         krb5_flags *ap_req_options,
1077                                                         krb5_ticket **ticket,
1078                                                         krb5_keyblock **keyblock)
1079 {
1080         krb5_error_code ret;
1081         krb5_kvno kvno;
1082         krb5_enctype enctype;
1083         krb5_keyblock *local_keyblock;
1084
1085         ret = krb5_rd_req(context,
1086                           auth_context,
1087                           inbuf,
1088                           server,
1089                           keytab,
1090                           ap_req_options,
1091                           ticket);
1092         if (ret) {
1093                 return ret;
1094         }
1095
1096 #ifdef KRB5_TICKET_HAS_KEYINFO
1097         enctype = (*ticket)->enc_part.enctype;
1098         kvno = (*ticket)->enc_part.kvno;
1099 #else
1100         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1101         if (ret) {
1102                 return ret;
1103         }
1104 #endif
1105
1106         ret = get_key_from_keytab(context,
1107                                   server,
1108                                   enctype,
1109                                   kvno,
1110                                   &local_keyblock);
1111         if (ret) {
1112                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1113                 goto out;
1114         }
1115
1116 out:
1117         if (ret && local_keyblock != NULL) {
1118                 krb5_free_keyblock(context, local_keyblock);
1119         } else {
1120                 *keyblock = local_keyblock;
1121         }
1122
1123         return ret;
1124 }
1125
1126  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1127                                             const char *name,
1128                                             krb5_principal *principal)
1129 {
1130 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1131         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1132 #endif
1133
1134         /* we are cheating here because parse_name will in fact set the realm.
1135          * We don't care as the only caller of smb_krb5_parse_name_norealm
1136          * ignores the realm anyway when calling
1137          * smb_krb5_principal_compare_any_realm later - Guenther */
1138
1139         return smb_krb5_parse_name(context, name, principal);
1140 }
1141
1142  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1143                                           krb5_const_principal princ1,
1144                                           krb5_const_principal princ2)
1145 {
1146 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1147
1148         return krb5_principal_compare_any_realm(context, princ1, princ2);
1149
1150 /* krb5_princ_size is a macro in MIT */
1151 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1152
1153         int i, len1, len2;
1154         const krb5_data *p1, *p2;
1155
1156         len1 = krb5_princ_size(context, princ1);
1157         len2 = krb5_princ_size(context, princ2);
1158
1159         if (len1 != len2)
1160                 return False;
1161
1162         for (i = 0; i < len1; i++) {
1163
1164                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1165                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1166
1167                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1168                         return False;
1169         }
1170
1171         return True;
1172 #else
1173 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1174 #endif
1175 }
1176
1177  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1178                                        const char *client_string,       /* gd@BER.SUSE.DE */
1179                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1180                                        time_t *expire_time)
1181 {
1182         krb5_error_code ret;
1183         krb5_context context = NULL;
1184         krb5_ccache ccache = NULL;
1185         krb5_principal client = NULL;
1186         krb5_creds creds, creds_in, *creds_out = NULL;
1187
1188         ZERO_STRUCT(creds);
1189         ZERO_STRUCT(creds_in);
1190
1191         initialize_krb5_error_table();
1192         ret = krb5_init_context(&context);
1193         if (ret) {
1194                 goto done;
1195         }
1196
1197         if (!ccache_string) {
1198                 ccache_string = krb5_cc_default_name(context);
1199         }
1200
1201         if (!ccache_string) {
1202                 ret = EINVAL;
1203                 goto done;
1204         }
1205
1206         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1207
1208         /* FIXME: we should not fall back to defaults */
1209         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1210         if (ret) {
1211                 goto done;
1212         }
1213
1214         if (client_string) {
1215                 ret = smb_krb5_parse_name(context, client_string, &client);
1216                 if (ret) {
1217                         goto done;
1218                 }
1219         } else {
1220                 ret = krb5_cc_get_principal(context, ccache, &client);
1221                 if (ret) {
1222                         goto done;
1223                 }
1224         }
1225
1226 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1227         {
1228                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1229                 if (ret) {
1230                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1231                         goto done;
1232                 }
1233         }
1234 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1235         {
1236                 krb5_kdc_flags flags;
1237                 krb5_realm *client_realm = NULL;
1238
1239                 ret = krb5_copy_principal(context, client, &creds_in.client);
1240                 if (ret) {
1241                         goto done;
1242                 }
1243
1244                 if (service_string) {
1245                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1246                         if (ret) {
1247                                 goto done;
1248                         }
1249                 } else {
1250                         /* build tgt service by default */
1251                         client_realm = krb5_princ_realm(context, creds_in.client);
1252                         if (!client_realm) {
1253                                 ret = ENOMEM;
1254                                 goto done;
1255                         }
1256                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1257                         if (ret) {
1258                                 goto done;
1259                         }
1260                 }
1261
1262                 flags.i = 0;
1263                 flags.b.renewable = flags.b.renew = True;
1264
1265                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1266                 if (ret) {
1267                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1268                         goto done;
1269                 }
1270
1271                 creds = *creds_out;
1272         }
1273 #else
1274 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1275 #endif
1276
1277         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1278         ret = krb5_cc_initialize(context, ccache, client);
1279         if (ret) {
1280                 goto done;
1281         }
1282
1283         ret = krb5_cc_store_cred(context, ccache, &creds);
1284
1285         if (expire_time) {
1286                 *expire_time = (time_t) creds.times.endtime;
1287         }
1288
1289 done:
1290         krb5_free_cred_contents(context, &creds_in);
1291
1292         if (creds_out) {
1293                 krb5_free_creds(context, creds_out);
1294         } else {
1295                 krb5_free_cred_contents(context, &creds);
1296         }
1297
1298         if (client) {
1299                 krb5_free_principal(context, client);
1300         }
1301         if (ccache) {
1302                 krb5_cc_close(context, ccache);
1303         }
1304         if (context) {
1305                 krb5_free_context(context);
1306         }
1307
1308         return ret;
1309 }
1310
1311  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1312 {
1313         krb5_error_code ret = 0;
1314         if (addr == NULL) {
1315                 return ret;
1316         }
1317 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1318         krb5_free_addresses(context, addr->addrs);
1319 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1320         ret = krb5_free_addresses(context, addr->addrs);
1321         SAFE_FREE(addr->addrs);
1322 #endif
1323         SAFE_FREE(addr);
1324         addr = NULL;
1325         return ret;
1326 }
1327
1328  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1329 {
1330         krb5_error_code ret = 0;
1331         nstring buf;
1332 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1333         krb5_address **addrs = NULL;
1334 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1335         krb5_addresses *addrs = NULL;
1336 #endif
1337
1338         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1339         if (*kerb_addr == NULL) {
1340                 return ENOMEM;
1341         }
1342
1343         put_name(buf, global_myname(), ' ', 0x20);
1344
1345 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1346         {
1347                 int num_addr = 2;
1348
1349                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1350                 if (addrs == NULL) {
1351                         SAFE_FREE(kerb_addr);
1352                         return ENOMEM;
1353                 }
1354
1355                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1356
1357                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1358                 if (addrs[0] == NULL) {
1359                         SAFE_FREE(addrs);
1360                         SAFE_FREE(kerb_addr);
1361                         return ENOMEM;
1362                 }
1363
1364                 addrs[0]->magic = KV5M_ADDRESS;
1365                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1366                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1367                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1368                 if (addrs[0]->contents == NULL) {
1369                         SAFE_FREE(addrs[0]);
1370                         SAFE_FREE(addrs);
1371                         SAFE_FREE(kerb_addr);
1372                         return ENOMEM;
1373                 }
1374
1375                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1376
1377                 addrs[1] = NULL;
1378         }
1379 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1380         {
1381                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1382                 if (addrs == NULL) {
1383                         SAFE_FREE(kerb_addr);
1384                         return ENOMEM;
1385                 }
1386
1387                 memset(addrs, 0, sizeof(krb5_addresses));
1388
1389                 addrs->len = 1;
1390                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1391                 if (addrs->val == NULL) {
1392                         SAFE_FREE(addrs);
1393                         SAFE_FREE(kerb_addr);
1394                         return ENOMEM;
1395                 }
1396
1397                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1398                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1399                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1400                 if (addrs->val[0].address.data == NULL) {
1401                         SAFE_FREE(addrs->val);
1402                         SAFE_FREE(addrs);
1403                         SAFE_FREE(kerb_addr);
1404                         return ENOMEM;
1405                 }
1406
1407                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1408         }
1409 #else
1410 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1411 #endif
1412         (*kerb_addr)->addrs = addrs;
1413
1414         return ret;
1415 }
1416
1417  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1418 {
1419 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1420         krb5_free_error_contents(context, krberror);
1421 #else /* MIT */
1422         krb5_free_error(context, krberror);
1423 #endif
1424 }
1425
1426  krb5_error_code handle_krberror_packet(krb5_context context,
1427                                         krb5_data *packet)
1428 {
1429         krb5_error_code ret;
1430         bool got_error_code = False;
1431
1432         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1433
1434 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1435         {
1436                 krb5_error krberror;
1437
1438                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1439                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1440                                 error_message(ret)));
1441                         return ret;
1442                 }
1443
1444                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1445                         ret = (krb5_error_code) krberror.error_code;
1446                         got_error_code = True;
1447                 }
1448
1449                 smb_krb5_free_error(context, &krberror);
1450         }
1451 #else /* MIT */
1452         {
1453                 krb5_error *krberror;
1454
1455                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1456                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1457                                 error_message(ret)));
1458                         return ret;
1459                 }
1460
1461                 if (krberror->e_data.data == NULL) {
1462                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1463                         got_error_code = True;
1464                 }
1465                 smb_krb5_free_error(context, krberror);
1466         }
1467 #endif
1468         if (got_error_code) {
1469                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1470                         error_message(ret), ret));
1471         }
1472         return ret;
1473 }
1474
1475  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1476                                             krb5_get_init_creds_opt **opt)
1477 {
1478 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1479         /* Heimdal or modern MIT version */
1480         return krb5_get_init_creds_opt_alloc(context, opt);
1481 #else
1482         /* Historical MIT version */
1483         krb5_get_init_creds_opt *my_opt;
1484
1485         *opt = NULL;
1486
1487         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1488                 return ENOMEM;
1489         }
1490
1491         krb5_get_init_creds_opt_init(my_opt);
1492
1493         *opt =  my_opt;
1494         return 0;
1495 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1496 }
1497
1498  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1499                                 krb5_get_init_creds_opt *opt)
1500 {
1501 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1502
1503 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1504         /* Modern MIT or Heimdal version */
1505         krb5_get_init_creds_opt_free(context, opt);
1506 #else
1507         /* Heimdal version */
1508         krb5_get_init_creds_opt_free(opt);
1509 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1510
1511 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1512         /* Historical MIT version */
1513         SAFE_FREE(opt);
1514         opt = NULL;
1515 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1516 }
1517
1518  krb5_enctype smb_get_enctype_from_kt_entry(const krb5_keytab_entry *kt_entry)
1519 {
1520 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY               /* MIT */
1521         return kt_entry->key.enctype;
1522 #elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK)  /* Heimdal */
1523         return kt_entry->keyblock.keytype;
1524 #else
1525 #error UNKNOWN_KRB5_KEYTAB_ENTRY_KEYBLOCK_FORMAT
1526 #endif
1527 }
1528
1529
1530 /* caller needs to free etype_s */
1531  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1532                                             krb5_enctype enctype,
1533                                             char **etype_s)
1534 {
1535 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1536         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1537 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1538         char buf[256];
1539         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1540         if (ret) {
1541                 return ret;
1542         }
1543         *etype_s = SMB_STRDUP(buf);
1544         if (!*etype_s) {
1545                 return ENOMEM;
1546         }
1547         return ret;
1548 #else
1549 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1550 #endif
1551 }
1552
1553  krb5_error_code smb_krb5_mk_error(krb5_context context,
1554                                 krb5_error_code error_code,
1555                                 const krb5_principal server,
1556                                 krb5_data *reply)
1557 {
1558 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1559         /*
1560          * The MIT interface is *terrible*.
1561          * We have to construct this ourselves...
1562          */
1563         krb5_error e;
1564
1565         memset(&e, 0, sizeof(e));
1566         krb5_us_timeofday(context, &e.stime, &e.susec);
1567         e.server = server;
1568 #if defined(krb5_err_base)
1569         e.error = error_code - krb5_err_base;
1570 #elif defined(ERROR_TABLE_BASE_krb5)
1571         e.error = error_code - ERROR_TABLE_BASE_krb5;
1572 #else
1573         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1574 #endif
1575
1576         return krb5_mk_error(context, &e, reply);
1577 #else /* Heimdal. */
1578         return krb5_mk_error(context,
1579                                 error_code,
1580                                 NULL,
1581                                 NULL, /* e_data */
1582                                 NULL,
1583                                 server,
1584                                 NULL,
1585                                 NULL,
1586                                 reply);
1587 #endif
1588 }
1589
1590 /**********************************************************************
1591  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1592  * allows to process non-default keytab names.
1593  * @param context krb5_context
1594  * @param keytab_name_req string
1595  * @param write_access bool if writable keytab is required
1596  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1597  * @return krb5_error_code
1598 **********************************************************************/
1599
1600 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1601 #ifndef MAX_KEYTAB_NAME_LEN
1602 #define MAX_KEYTAB_NAME_LEN 1100
1603 #endif
1604
1605  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1606                                       const char *keytab_name_req,
1607                                       bool write_access,
1608                                       krb5_keytab *keytab)
1609 {
1610         krb5_error_code ret = 0;
1611         TALLOC_CTX *mem_ctx;
1612         char keytab_string[MAX_KEYTAB_NAME_LEN];
1613         char *kt_str = NULL;
1614         bool found_valid_name = False;
1615         const char *pragma = "FILE";
1616         const char *tmp = NULL;
1617
1618         if (!write_access && !keytab_name_req) {
1619                 /* caller just wants to read the default keytab readonly, so be it */
1620                 return krb5_kt_default(context, keytab);
1621         }
1622
1623         mem_ctx = talloc_init("smb_krb5_open_keytab");
1624         if (!mem_ctx) {
1625                 return ENOMEM;
1626         }
1627
1628 #ifdef HAVE_WRFILE_KEYTAB
1629         if (write_access) {
1630                 pragma = "WRFILE";
1631         }
1632 #endif
1633
1634         if (keytab_name_req) {
1635
1636                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1637                         ret = KRB5_CONFIG_NOTENUFSPACE;
1638                         goto out;
1639                 }
1640
1641                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1642                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1643                         tmp = keytab_name_req;
1644                         goto resolve;
1645                 }
1646
1647                 if (keytab_name_req[0] != '/') {
1648                         ret = KRB5_KT_BADNAME;
1649                         goto out;
1650                 }
1651
1652                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1653                 if (!tmp) {
1654                         ret = ENOMEM;
1655                         goto out;
1656                 }
1657
1658                 goto resolve;
1659         }
1660
1661         /* we need to handle more complex keytab_strings, like:
1662          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1663
1664         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1665         if (ret) {
1666                 goto out;
1667         }
1668
1669         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1670
1671         tmp = talloc_strdup(mem_ctx, keytab_string);
1672         if (!tmp) {
1673                 ret = ENOMEM;
1674                 goto out;
1675         }
1676
1677         if (strncmp(tmp, "ANY:", 4) == 0) {
1678                 tmp += 4;
1679         }
1680
1681         memset(&keytab_string, '\0', sizeof(keytab_string));
1682
1683         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1684                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1685                         found_valid_name = True;
1686                         tmp = kt_str;
1687                         tmp += 7;
1688                 }
1689
1690                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1691                         found_valid_name = True;
1692                         tmp = kt_str;
1693                         tmp += 5;
1694                 }
1695
1696                 if (found_valid_name) {
1697                         if (tmp[0] != '/') {
1698                                 ret = KRB5_KT_BADNAME;
1699                                 goto out;
1700                         }
1701
1702                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1703                         if (!tmp) {
1704                                 ret = ENOMEM;
1705                                 goto out;
1706                         }
1707                         break;
1708                 }
1709         }
1710
1711         if (!found_valid_name) {
1712                 ret = KRB5_KT_UNKNOWN_TYPE;
1713                 goto out;
1714         }
1715
1716  resolve:
1717         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1718         ret = krb5_kt_resolve(context, tmp, keytab);
1719
1720  out:
1721         TALLOC_FREE(mem_ctx);
1722         return ret;
1723 }
1724
1725 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1726                                      krb5_context context,
1727                                      krb5_keytab keytab,
1728                                      const char **keytab_name)
1729 {
1730         char keytab_string[MAX_KEYTAB_NAME_LEN];
1731         krb5_error_code ret = 0;
1732
1733         ret = krb5_kt_get_name(context, keytab,
1734                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1735         if (ret) {
1736                 return ret;
1737         }
1738
1739         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1740         if (!*keytab_name) {
1741                 return ENOMEM;
1742         }
1743
1744         return ret;
1745 }
1746
1747 #else /* HAVE_KRB5 */
1748  /* this saves a few linking headaches */
1749  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1750                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1751                         const char *ccname, time_t *tgs_expire)
1752 {
1753          DEBUG(0,("NO KERBEROS SUPPORT\n"));
1754          return 1;
1755 }
1756
1757 #endif