lib/krb5_wrap/krb5_samba.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 2005-2009
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "system/filesys.h"
  25 #include "krb5_samba.h"
  26 #include "lib/crypto/crypto.h"
  27
  28 #ifdef HAVE_COM_ERR_H
  29 #include <com_err.h>
  30 #endif /* HAVE_COM_ERR_H */
  31
  32 #ifndef KRB5_AUTHDATA_WIN2K_PAC
  33 #define KRB5_AUTHDATA_WIN2K_PAC 128
  34 #endif
  35
  36 #ifndef KRB5_AUTHDATA_IF_RELEVANT
  37 #define KRB5_AUTHDATA_IF_RELEVANT 1
  38 #endif
  39
  40 #ifdef HAVE_KRB5
  41
  42 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  43 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  44 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
  45                                                         bind field, flags field. */
  46 #define GSS_C_DELEG_FLAG 1
  47
  48 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
  49    but still has the symbol */
  50 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
  51 krb5_error_code krb5_auth_con_set_req_cksumtype(
  52         krb5_context     context,
  53         krb5_auth_context      auth_context,
  54         krb5_cksumtype     cksumtype);
  55 #endif
  56
  57 #if !defined(SMB_MALLOC)
  58 #undef malloc
  59 #define SMB_MALLOC(s) malloc((s))
  60 #endif
  61
  62 #ifndef SMB_STRDUP
  63 #define SMB_STRDUP(s) strdup(s)
  64 #endif
  65
  66 /**********************************************************
  67  * MISSING FUNCTIONS
  68  **********************************************************/
  69
  70 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
  71
  72 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
  73
  74 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
  75  * to krb5_set_default_tgs_ktypes. See
  76  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
  77  *
  78  * If the MIT libraries are not exporting internal symbols, we will end up in
  79  * this branch, which is correct. Otherwise we will continue to use the
  80  * internal symbol
  81  */
  82  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  83 {
  84     return krb5_set_default_tgs_enctypes(ctx, enc);
  85 }
  86
  87 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
  88
  89 /* Heimdal */
  90  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  91 {
  92         return krb5_set_default_in_tkt_etypes(ctx, enc);
  93 }
  94
  95 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
  96
  97 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
  98
  99
 100 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 101 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 102                                              krb5_auth_context auth_context,
 103                                              krb5_keyblock *keyblock)
 104 {
 105         return krb5_auth_con_setkey(context, auth_context, keyblock);
 106 }
 107 #endif
 108
 109 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 110 void krb5_free_unparsed_name(krb5_context context, char *val)
 111 {
 112         SAFE_FREE(val);
 113 }
 114 #endif
 115
 116 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 117 const krb5_data *krb5_princ_component(krb5_context context,
 118                                       krb5_principal principal, int i);
 119
 120 const krb5_data *krb5_princ_component(krb5_context context,
 121                                       krb5_principal principal, int i)
 122 {
 123         static krb5_data kdata;
 124
 125         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 126         kdata.length = strlen((const char *)kdata.data);
 127         return &kdata;
 128 }
 129 #endif
 130
 131
 132 /**********************************************************
 133  * WRAPPING FUNCTIONS
 134  **********************************************************/
 135
 136 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 137 /* HEIMDAL */
 138
 139 /**
 140  * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
 141  *
 142  * @param[in]  paddr    A pointer to a 'struct sockaddr_storage to extract the
 143  *                      address from.
 144  *
 145  * @param[out] pkaddr   A Kerberos address to store tha address in.
 146  *
 147  * @return True on success, false if an error occurred.
 148  */
 149 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
 150                                 krb5_address *pkaddr)
 151 {
 152         memset(pkaddr, '\0', sizeof(krb5_address));
 153 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 154         if (paddr->ss_family == AF_INET6) {
 155                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 156                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 157                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 158                 return true;
 159         }
 160 #endif
 161         if (paddr->ss_family == AF_INET) {
 162                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 163                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 164                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 165                 return true;
 166         }
 167         return false;
 168 }
 169 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 170 /* MIT */
 171
 172 /**
 173  * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
 174  *
 175  * @param[in]  paddr    A pointer to a 'struct sockaddr_storage to extract the
 176  *                      address from.
 177  *
 178  * @param[in]  pkaddr A Kerberos address to store tha address in.
 179  *
 180  * @return True on success, false if an error occurred.
 181  */
 182 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
 183                                 krb5_address *pkaddr)
 184 {
 185         memset(pkaddr, '\0', sizeof(krb5_address));
 186 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 187         if (paddr->ss_family == AF_INET6) {
 188                 pkaddr->addrtype = ADDRTYPE_INET6;
 189                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 190                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 191                 return true;
 192         }
 193 #endif
 194         if (paddr->ss_family == AF_INET) {
 195                 pkaddr->addrtype = ADDRTYPE_INET;
 196                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 197                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 198                 return true;
 199         }
 200         return false;
 201 }
 202 #else
 203 #error UNKNOWN_ADDRTYPE
 204 #endif
 205
 206 krb5_error_code smb_krb5_mk_error(krb5_context context,
 207                                   krb5_error_code error_code,
 208                                   const char *e_text,
 209                                   krb5_data *e_data,
 210                                   const krb5_principal client,
 211                                   const krb5_principal server,
 212                                   krb5_data *enc_err)
 213 {
 214         krb5_error_code code = EINVAL;
 215 #ifdef SAMBA4_USES_HEIMDAL
 216         code = krb5_mk_error(context,
 217                              error_code,
 218                              e_text,
 219                              e_data,
 220                              client,
 221                              server,
 222                              NULL, /* client_time */
 223                              NULL, /* client_usec */
 224                              enc_err);
 225 #else
 226         krb5_principal unspec_server = NULL;
 227         krb5_error errpkt;
 228
 229         errpkt.ctime = 0;
 230         errpkt.cusec = 0;
 231
 232         code = krb5_us_timeofday(context,
 233                                  &errpkt.stime,
 234                                  &errpkt.susec);
 235         if (code != 0) {
 236                 return code;
 237         }
 238
 239         errpkt.error = error_code;
 240
 241         errpkt.text.length = 0;
 242         if (e_text != NULL) {
 243                 errpkt.text.length = strlen(e_text);
 244                 errpkt.text.data = discard_const_p(char, e_text);
 245         }
 246
 247         errpkt.e_data.magic = KV5M_DATA;
 248         errpkt.e_data.length = 0;
 249         errpkt.e_data.data = NULL;
 250         if (e_data != NULL) {
 251                 errpkt.e_data = *e_data;
 252         }
 253
 254         errpkt.client = client;
 255
 256         if (server != NULL) {
 257                 errpkt.server = server;
 258         } else {
 259                 code = smb_krb5_make_principal(context,
 260                                                &unspec_server,
 261                                                "<unspecified realm>",
 262                                                NULL);
 263                 if (code != 0) {
 264                         return code;
 265                 }
 266                 errpkt.server = unspec_server;
 267         }
 268
 269         code = krb5_mk_error(context,
 270                              &errpkt,
 271                              enc_err);
 272         krb5_free_principal(context, unspec_server);
 273 #endif
 274         return code;
 275 }
 276
 277 /**
 278 * @brief Create a keyblock based on input parameters
 279 *
 280 * @param context        The krb5_context
 281 * @param host_princ     The krb5_principal to use
 282 * @param salt           The optional salt, if omitted, salt is calculated with
 283 *                       the provided principal.
 284 * @param password       The krb5_data containing the password
 285 * @param enctype        The krb5_enctype to use for the keyblock generation
 286 * @param key            The returned krb5_keyblock, caller needs to free with
 287 *                       krb5_free_keyblock().
 288 *
 289 * @return krb5_error_code
 290 */
 291 int smb_krb5_create_key_from_string(krb5_context context,
 292                                     krb5_const_principal host_princ,
 293                                     krb5_data *salt,
 294                                     krb5_data *password,
 295                                     krb5_enctype enctype,
 296                                     krb5_keyblock *key)
 297 {
 298         int ret = 0;
 299
 300         if (host_princ == NULL && salt == NULL) {
 301                 return -1;
 302         }
 303
 304         if ((int)enctype == (int)ENCTYPE_ARCFOUR_HMAC) {
 305                 TALLOC_CTX *frame = talloc_stackframe();
 306                 uint8_t *utf16 = NULL;
 307                 size_t utf16_size = 0;
 308                 uint8_t nt_hash[16];
 309                 bool ok;
 310
 311                 ok = convert_string_talloc(frame, CH_UNIX, CH_UTF16LE,
 312                                            password->data, password->length,
 313                                            (void **)&utf16, &utf16_size);
 314                 if (!ok) {
 315                         if (errno == 0) {
 316                                 errno = EINVAL;
 317                         }
 318                         ret = errno;
 319                         TALLOC_FREE(frame);
 320                         return ret;
 321                 }
 322
 323                 mdfour(nt_hash, utf16, utf16_size);
 324                 memset(utf16, 0, utf16_size);
 325                 ret = smb_krb5_keyblock_init_contents(context,
 326                                                       ENCTYPE_ARCFOUR_HMAC,
 327                                                       nt_hash,
 328                                                       sizeof(nt_hash),
 329                                                       key);
 330                 ZERO_STRUCT(nt_hash);
 331                 if (ret != 0) {
 332                         TALLOC_FREE(frame);
 333                         return ret;
 334                 }
 335
 336                 TALLOC_FREE(frame);
 337                 return 0;
 338         }
 339
 340 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
 341 {/* MIT */
 342         krb5_data _salt;
 343
 344         if (salt == NULL) {
 345                 ret = krb5_principal2salt(context, host_princ, &_salt);
 346                 if (ret) {
 347                         DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 348                         return ret;
 349                 }
 350         } else {
 351                 _salt = *salt;
 352         }
 353         ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
 354         if (salt == NULL) {
 355                 SAFE_FREE(_salt.data);
 356         }
 357 }
 358 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 359 {/* Heimdal */
 360         krb5_salt _salt;
 361
 362         if (salt == NULL) {
 363                 ret = krb5_get_pw_salt(context, host_princ, &_salt);
 364                 if (ret) {
 365                         DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 366                         return ret;
 367                 }
 368         } else {
 369                 _salt.saltvalue = *salt;
 370                 _salt.salttype = KRB5_PW_SALT;
 371         }
 372
 373         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
 374         if (salt == NULL) {
 375                 krb5_free_salt(context, _salt);
 376         }
 377 }
 378 #else
 379 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 380 #endif
 381         return ret;
 382 }
 383
 384 /**
 385 * @brief Create a salt for a given principal
 386 *
 387 * @param context        The initialized krb5_context
 388 * @param host_princ     The krb5_principal to create the salt for
 389 * @param psalt          A pointer to a krb5_data struct
 390 *
 391 * caller has to free the contents of psalt with smb_krb5_free_data_contents
 392 * when function has succeeded
 393 *
 394 * @return krb5_error_code, returns 0 on success, error code otherwise
 395 */
 396
 397 int smb_krb5_get_pw_salt(krb5_context context,
 398                          krb5_const_principal host_princ,
 399                          krb5_data *psalt)
 400 #if defined(HAVE_KRB5_GET_PW_SALT)
 401 /* Heimdal */
 402 {
 403         int ret;
 404         krb5_salt salt;
 405
 406         ret = krb5_get_pw_salt(context, host_princ, &salt);
 407         if (ret) {
 408                 return ret;
 409         }
 410
 411         psalt->data = salt.saltvalue.data;
 412         psalt->length = salt.saltvalue.length;
 413
 414         return ret;
 415 }
 416 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
 417 /* MIT */
 418 {
 419         return krb5_principal2salt(context, host_princ, psalt);
 420 }
 421 #else
 422 #error UNKNOWN_SALT_FUNCTIONS
 423 #endif
 424
 425 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 426 /**
 427  * @brief Get a list of encryption types allowed for session keys
 428  *
 429  * @param[in]  context  The library context
 430  *
 431  * @param[in]  enctypes An allocated, zero-terminated list of encryption types
 432  *
 433  * This function returns an allocated list of encryption types allowed for
 434  * session keys.
 435  *
 436  * Use free() to free the enctypes when it is no longer needed.
 437  *
 438  * @retval 0 Success; otherwise - Kerberos error codes
 439  */
 440 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
 441                                             krb5_enctype **enctypes)
 442 {
 443         return krb5_get_permitted_enctypes(context, enctypes);
 444 }
 445 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 446 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
 447                                             krb5_enctype **enctypes)
 448 {
 449 #ifdef HAVE_KRB5_PDU_NONE_DECL
 450         return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
 451 #else
 452         return krb5_get_default_in_tkt_etypes(context, enctypes);
 453 #endif
 454 }
 455 #else
 456 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 457 #endif
 458
 459
 460 /**
 461  * @brief Convert a string principal name to a Kerberos principal.
 462  *
 463  * @param[in]  context  The library context
 464  *
 465  * @param[in]  name     The principal as a unix charset string.
 466  *
 467  * @param[out] principal The newly allocated principal.
 468  *
 469  * Use krb5_free_principal() to free a principal when it is no longer needed.
 470  *
 471  * @return 0 on success, a Kerberos error code otherwise.
 472  */
 473 krb5_error_code smb_krb5_parse_name(krb5_context context,
 474                                     const char *name,
 475                                     krb5_principal *principal)
 476 {
 477         krb5_error_code ret;
 478         char *utf8_name;
 479         size_t converted_size;
 480         TALLOC_CTX *frame = talloc_stackframe();
 481
 482         if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
 483                 talloc_free(frame);
 484                 return ENOMEM;
 485         }
 486
 487         ret = krb5_parse_name(context, utf8_name, principal);
 488         TALLOC_FREE(frame);
 489         return ret;
 490 }
 491
 492 /**
 493  * @brief Convert a Kerberos principal structure to a string representation.
 494  *
 495  * The resulting string representation will be a unix charset name and is
 496  * talloc'ed.
 497  *
 498  * @param[in]  mem_ctx  The talloc context to allocate memory on.
 499  *
 500  * @param[in]  context  The library context.
 501  *
 502  * @param[in]  principal The principal.
 503  *
 504  * @param[out] unix_name A string representation of the princpial name as with
 505  *                       unix charset.
 506  *
 507  * Use talloc_free() to free the string representation if it is no longer
 508  * needed.
 509  *
 510  * @return 0 on success, a Kerberos error code otherwise.
 511  */
 512 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 513                                       krb5_context context,
 514                                       krb5_const_principal principal,
 515                                       char **unix_name)
 516 {
 517         krb5_error_code ret;
 518         char *utf8_name;
 519         size_t converted_size;
 520
 521         *unix_name = NULL;
 522         ret = krb5_unparse_name(context, principal, &utf8_name);
 523         if (ret) {
 524                 return ret;
 525         }
 526
 527         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 528                 krb5_free_unparsed_name(context, utf8_name);
 529                 return ENOMEM;
 530         }
 531         krb5_free_unparsed_name(context, utf8_name);
 532         return 0;
 533 }
 534
 535 /**
 536  * @brief Free the contents of a krb5_data structure and zero the data field.
 537  *
 538  * @param[in]  context  The krb5 context
 539  *
 540  * @param[in]  pdata    The data structure to free contents of
 541  *
 542  * This function frees the contents, not the structure itself.
 543  */
 544 void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata)
 545 {
 546 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 547         if (pdata->data) {
 548                 krb5_free_data_contents(context, pdata);
 549         }
 550 #elif defined(HAVE_KRB5_DATA_FREE)
 551         krb5_data_free(context, pdata);
 552 #else
 553         SAFE_FREE(pdata->data);
 554 #endif
 555 }
 556
 557 /*
 558  * @brief copy a buffer into a krb5_data struct
 559  *
 560  * @param[in] p                 The krb5_data
 561  * @param[in] data              The data to copy
 562  * @param[in] length            The length of the data to copy
 563  * @return krb5_error_code
 564  *
 565  * Caller has to free krb5_data with smb_krb5_free_data_contents().
 566  */
 567 krb5_error_code smb_krb5_copy_data_contents(krb5_data *p,
 568                                             const void *data,
 569                                             size_t len)
 570 {
 571 #if defined(HAVE_KRB5_DATA_COPY)
 572         return krb5_data_copy(p, data, len);
 573 #else
 574         if (len) {
 575                 p->data = malloc(len);
 576                 if (p->data == NULL) {
 577                         return ENOMEM;
 578                 }
 579                 memmove(p->data, data, len);
 580         } else {
 581                 p->data = NULL;
 582         }
 583         p->length = len;
 584         p->magic = KV5M_DATA;
 585         return 0;
 586 #endif
 587 }
 588
 589 bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx,
 590                                   krb5_context context,
 591                                   krb5_auth_context auth_context,
 592                                   DATA_BLOB *session_key,
 593                                   bool remote)
 594 {
 595         krb5_keyblock *skey = NULL;
 596         krb5_error_code err = 0;
 597         bool ret = false;
 598
 599         if (remote) {
 600 #ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
 601                 err = krb5_auth_con_getrecvsubkey(context,
 602                                                   auth_context,
 603                                                   &skey);
 604 #else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
 605                 err = krb5_auth_con_getremotesubkey(context,
 606                                                     auth_context, &skey);
 607 #endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
 608         } else {
 609 #ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
 610                 err = krb5_auth_con_getsendsubkey(context,
 611                                                   auth_context,
 612                                                   &skey);
 613 #else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
 614                 err = krb5_auth_con_getlocalsubkey(context,
 615                                                    auth_context, &skey);
 616 #endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
 617         }
 618
 619         if (err || skey == NULL) {
 620                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 621                 goto done;
 622         }
 623
 624         DEBUG(10, ("Got KRB5 session key of length %d\n",
 625                    (int)KRB5_KEY_LENGTH(skey)));
 626
 627         *session_key = data_blob_talloc(mem_ctx,
 628                                          KRB5_KEY_DATA(skey),
 629                                          KRB5_KEY_LENGTH(skey));
 630         dump_data_pw("KRB5 Session Key:\n",
 631                      session_key->data,
 632                      session_key->length);
 633
 634         ret = true;
 635
 636 done:
 637         if (skey) {
 638                 krb5_free_keyblock(context, skey);
 639         }
 640
 641         return ret;
 642 }
 643
 644
 645 /**
 646  * @brief Get talloced string component of a principal
 647  *
 648  * @param[in] mem_ctx           The TALLOC_CTX
 649  * @param[in] context           The krb5_context
 650  * @param[in] principal         The principal
 651  * @param[in] component         The component
 652  * @return string component
 653  *
 654  * Caller must talloc_free if the return value is not NULL.
 655  *
 656  */
 657 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
 658                                          krb5_context context,
 659                                          krb5_const_principal principal,
 660                                          unsigned int component)
 661 {
 662 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
 663         return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
 664 #else
 665         krb5_data *data;
 666
 667         if (component >= krb5_princ_size(context, principal)) {
 668                 return NULL;
 669         }
 670
 671         data = krb5_princ_component(context, principal, component);
 672         if (data == NULL) {
 673                 return NULL;
 674         }
 675
 676         return talloc_strndup(mem_ctx, data->data, data->length);
 677 #endif
 678 }
 679
 680 /**
 681  * @brief
 682  *
 683  * @param[in]  ccache_string A string pointing to the cache to renew the ticket
 684  *                           (e.g. FILE:/tmp/krb5cc_0) or NULL. If the principal
 685  *                           ccache has not been specified, the default ccache
 686  *                           will be used.
 687  *
 688  * @param[in]  client_string The client principal string (e.g. user@SAMBA.SITE)
 689  *                           or NULL. If the principal string has not been
 690  *                           specified, the principal from the ccache will be
 691  *                           retrieved.
 692  *
 693  * @param[in]  service_string The service ticket string
 694  *                            (e.g. krbtgt/SAMBA.SITE@SAMBA.SITE) or NULL. If
 695  *                            the sevice ticket is specified, it is parsed (
 696  *                            with the realm part ignored) and used as the
 697  *                            server principal of the credential. Otherwise
 698  *                            the ticket-granting service is used.
 699  *
 700  * @param[in]  expire_time    A pointer to store the credentials end time or
 701  *                            NULL.
 702  *
 703  * @return 0 on Succes, a Kerberos error code otherwise.
 704  */
 705 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,
 706                                       const char *client_string,
 707                                       const char *service_string,
 708                                       time_t *expire_time)
 709 {
 710         krb5_error_code ret;
 711         krb5_context context = NULL;
 712         krb5_ccache ccache = NULL;
 713         krb5_principal client = NULL;
 714         krb5_creds creds, creds_in;
 715
 716         ZERO_STRUCT(creds);
 717         ZERO_STRUCT(creds_in);
 718
 719         initialize_krb5_error_table();
 720         ret = krb5_init_context(&context);
 721         if (ret) {
 722                 goto done;
 723         }
 724
 725         if (!ccache_string) {
 726                 ccache_string = krb5_cc_default_name(context);
 727         }
 728
 729         if (!ccache_string) {
 730                 ret = EINVAL;
 731                 goto done;
 732         }
 733
 734         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
 735
 736         /* FIXME: we should not fall back to defaults */
 737         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
 738         if (ret) {
 739                 goto done;
 740         }
 741
 742         if (client_string) {
 743                 ret = smb_krb5_parse_name(context, client_string, &client);
 744                 if (ret) {
 745                         goto done;
 746                 }
 747         } else {
 748                 ret = krb5_cc_get_principal(context, ccache, &client);
 749                 if (ret) {
 750                         goto done;
 751                 }
 752         }
 753
 754         ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
 755         if (ret) {
 756                 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
 757                 goto done;
 758         }
 759
 760         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
 761         ret = krb5_cc_initialize(context, ccache, client);
 762         if (ret) {
 763                 goto done;
 764         }
 765
 766         ret = krb5_cc_store_cred(context, ccache, &creds);
 767
 768         if (expire_time) {
 769                 *expire_time = (time_t) creds.times.endtime;
 770         }
 771
 772 done:
 773         krb5_free_cred_contents(context, &creds_in);
 774         krb5_free_cred_contents(context, &creds);
 775
 776         if (client) {
 777                 krb5_free_principal(context, client);
 778         }
 779         if (ccache) {
 780                 krb5_cc_close(context, ccache);
 781         }
 782         if (context) {
 783                 krb5_free_context(context);
 784         }
 785
 786         return ret;
 787 }
 788
 789 /**
 790  * @brief Free the data stored in an smb_krb5_addresses structure.
 791  *
 792  * @param[in]  context  The library context
 793  *
 794  * @param[in]  addr     The address structure to free.
 795  *
 796  * @return 0 on success, a Kerberos error code otherwise.
 797  */
 798 krb5_error_code smb_krb5_free_addresses(krb5_context context,
 799                                         smb_krb5_addresses *addr)
 800 {
 801         krb5_error_code ret = 0;
 802         if (addr == NULL) {
 803                 return ret;
 804         }
 805 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 806         krb5_free_addresses(context, addr->addrs);
 807 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 808         ret = krb5_free_addresses(context, addr->addrs);
 809         SAFE_FREE(addr->addrs);
 810 #endif
 811         SAFE_FREE(addr);
 812         addr = NULL;
 813         return ret;
 814 }
 815
 816 #define MAX_NETBIOSNAME_LEN 16
 817
 818 /**
 819  * @brief Add a netbios name to the array of addresses
 820  *
 821  * @param[in]  kerb_addr A pointer to the smb_krb5_addresses to add the
 822  *                       netbios name to.
 823  *
 824  * @param[in]  netbios_name The netbios name to add.
 825  *
 826  * @return 0 on success, a Kerberos error code otherwise.
 827  */
 828 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
 829                                                    const char *netbios_name)
 830 {
 831         krb5_error_code ret = 0;
 832         char buf[MAX_NETBIOSNAME_LEN];
 833         int len;
 834 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 835         krb5_address **addrs = NULL;
 836 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 837         krb5_addresses *addrs = NULL;
 838 #endif
 839
 840         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
 841         if (*kerb_addr == NULL) {
 842                 return ENOMEM;
 843         }
 844
 845         /* temporarily duplicate put_name() code here to avoid dependency
 846          * issues for a 5 lines function */
 847         len = strlen(netbios_name);
 848         memcpy(buf, netbios_name,
 849                 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
 850         if (len < MAX_NETBIOSNAME_LEN - 1) {
 851                 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
 852         }
 853         buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
 854
 855 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 856         {
 857                 int num_addr = 2;
 858
 859                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
 860                 if (addrs == NULL) {
 861                         SAFE_FREE(*kerb_addr);
 862                         return ENOMEM;
 863                 }
 864
 865                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
 866
 867                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
 868                 if (addrs[0] == NULL) {
 869                         SAFE_FREE(addrs);
 870                         SAFE_FREE(*kerb_addr);
 871                         return ENOMEM;
 872                 }
 873
 874                 addrs[0]->magic = KV5M_ADDRESS;
 875                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
 876                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
 877                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
 878                 if (addrs[0]->contents == NULL) {
 879                         SAFE_FREE(addrs[0]);
 880                         SAFE_FREE(addrs);
 881                         SAFE_FREE(*kerb_addr);
 882                         return ENOMEM;
 883                 }
 884
 885                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
 886
 887                 addrs[1] = NULL;
 888         }
 889 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 890         {
 891                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
 892                 if (addrs == NULL) {
 893                         SAFE_FREE(*kerb_addr);
 894                         return ENOMEM;
 895                 }
 896
 897                 memset(addrs, 0, sizeof(krb5_addresses));
 898
 899                 addrs->len = 1;
 900                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
 901                 if (addrs->val == NULL) {
 902                         SAFE_FREE(addrs);
 903                         SAFE_FREE(kerb_addr);
 904                         return ENOMEM;
 905                 }
 906
 907                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
 908                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
 909                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
 910                 if (addrs->val[0].address.data == NULL) {
 911                         SAFE_FREE(addrs->val);
 912                         SAFE_FREE(addrs);
 913                         SAFE_FREE(*kerb_addr);
 914                         return ENOMEM;
 915                 }
 916
 917                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
 918         }
 919 #else
 920 #error UNKNOWN_KRB5_ADDRESS_FORMAT
 921 #endif
 922         (*kerb_addr)->addrs = addrs;
 923
 924         return ret;
 925 }
 926
 927 /**
 928  * @brief Get the enctype from a key table entry
 929  *
 930  * @param[in]  kt_entry Key table entry to get the enctype from.
 931  *
 932  * @return The enctype from the entry.
 933  */
 934 krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry)
 935 {
 936         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
 937 }
 938
 939 /**
 940  * @brief Free the contents of a key table entry.
 941  *
 942  * @param[in]  context The library context.
 943  *
 944  * @param[in]  kt_entry The key table entry to free the contents of.
 945  *
 946  * @return 0 on success, a Kerberos error code otherwise.
 947  *
 948  * The pointer itself is not freed.
 949  */
 950 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
 951                                         krb5_keytab_entry *kt_entry)
 952 {
 953 /* Try krb5_free_keytab_entry_contents first, since
 954  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 955  * krb5_kt_free_entry but only has a prototype for the first, while the
 956  * second is considered private.
 957  */
 958 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 959         return krb5_free_keytab_entry_contents(context, kt_entry);
 960 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
 961         return krb5_kt_free_entry(context, kt_entry);
 962 #else
 963 #error UNKNOWN_KT_FREE_FUNCTION
 964 #endif
 965 }
 966
 967
 968 /**
 969  * @brief Convert an encryption type to a string.
 970  *
 971  * @param[in]  context The library context.
 972  *
 973  * @param[in]  enctype The encryption type.
 974  *
 975  * @param[in]  etype_s A pointer to store the allocated encryption type as a
 976  *                     string.
 977  *
 978  * @return 0 on success, a Kerberos error code otherwise.
 979  *
 980  * The caller needs to free the allocated string etype_s.
 981  */
 982 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
 983                                            krb5_enctype enctype,
 984                                            char **etype_s)
 985 {
 986 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
 987         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
 988 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
 989         char buf[256];
 990         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
 991         if (ret) {
 992                 return ret;
 993         }
 994         *etype_s = SMB_STRDUP(buf);
 995         if (!*etype_s) {
 996                 return ENOMEM;
 997         }
 998         return ret;
 999 #else
1000 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1001 #endif
1002 }
1003
1004 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1005 #ifndef MAX_KEYTAB_NAME_LEN
1006 #define MAX_KEYTAB_NAME_LEN 1100
1007 #endif
1008
1009 /**
1010  * @brief Open a key table readonly or with readwrite access.
1011  *
1012  * Allows to use a different keytab than the default one using a relative
1013  * path to the keytab.
1014  *
1015  * @param[in]  context  The library context
1016  *
1017  * @param[in]  keytab_name_req The path to the key table.
1018  *
1019  * @param[in]  write_access Open with readwrite access.
1020  *
1021  * @param[in]  keytab A pointer o the opended key table.
1022  *
1023  * The keytab pointer should be freed using krb5_kt_close().
1024  *
1025  * @return 0 on success, a Kerberos error code otherwise.
1026  */
1027 krb5_error_code smb_krb5_kt_open_relative(krb5_context context,
1028                                           const char *keytab_name_req,
1029                                           bool write_access,
1030                                           krb5_keytab *keytab)
1031 {
1032         krb5_error_code ret = 0;
1033         TALLOC_CTX *mem_ctx;
1034         char keytab_string[MAX_KEYTAB_NAME_LEN];
1035         char *kt_str = NULL;
1036         bool found_valid_name = false;
1037         const char *pragma = "FILE";
1038         const char *tmp = NULL;
1039
1040         if (!write_access && !keytab_name_req) {
1041                 /* caller just wants to read the default keytab readonly, so be it */
1042                 return krb5_kt_default(context, keytab);
1043         }
1044
1045         mem_ctx = talloc_init("smb_krb5_open_keytab");
1046         if (!mem_ctx) {
1047                 return ENOMEM;
1048         }
1049
1050 #ifdef HAVE_WRFILE_KEYTAB
1051         if (write_access) {
1052                 pragma = "WRFILE";
1053         }
1054 #endif
1055
1056         if (keytab_name_req) {
1057
1058                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1059                         ret = KRB5_CONFIG_NOTENUFSPACE;
1060                         goto out;
1061                 }
1062
1063                 if ((strncmp(keytab_name_req, "WRFILE:", 7) == 0) ||
1064                     (strncmp(keytab_name_req, "FILE:", 5) == 0)) {
1065                         tmp = keytab_name_req;
1066                         goto resolve;
1067                 }
1068
1069                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1070                 if (!tmp) {
1071                         ret = ENOMEM;
1072                         goto out;
1073                 }
1074
1075                 goto resolve;
1076         }
1077
1078         /* we need to handle more complex keytab_strings, like:
1079          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1080
1081         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1082         if (ret) {
1083                 goto out;
1084         }
1085
1086         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1087
1088         tmp = talloc_strdup(mem_ctx, keytab_string);
1089         if (!tmp) {
1090                 ret = ENOMEM;
1091                 goto out;
1092         }
1093
1094         if (strncmp(tmp, "ANY:", 4) == 0) {
1095                 tmp += 4;
1096         }
1097
1098         memset(&keytab_string, '\0', sizeof(keytab_string));
1099
1100         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1101                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1102                         found_valid_name = true;
1103                         tmp = kt_str;
1104                         tmp += 7;
1105                 }
1106
1107                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1108                         found_valid_name = true;
1109                         tmp = kt_str;
1110                         tmp += 5;
1111                 }
1112
1113                 if (tmp[0] == '/') {
1114                         /* Treat as a FILE: keytab definition. */
1115                         found_valid_name = true;
1116                 }
1117
1118                 if (found_valid_name) {
1119                         if (tmp[0] != '/') {
1120                                 ret = KRB5_KT_BADNAME;
1121                                 goto out;
1122                         }
1123
1124                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1125                         if (!tmp) {
1126                                 ret = ENOMEM;
1127                                 goto out;
1128                         }
1129                         break;
1130                 }
1131         }
1132
1133         if (!found_valid_name) {
1134                 ret = KRB5_KT_UNKNOWN_TYPE;
1135                 goto out;
1136         }
1137
1138 resolve:
1139         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1140         ret = krb5_kt_resolve(context, tmp, keytab);
1141
1142 out:
1143         TALLOC_FREE(mem_ctx);
1144         return ret;
1145 }
1146
1147 /**
1148  * @brief Open a key table readonly or with readwrite access.
1149  *
1150  * Allows to use a different keytab than the default one. The path needs to be
1151  * an absolute path or an error will be returned.
1152  *
1153  * @param[in]  context  The library context
1154  *
1155  * @param[in]  keytab_name_req The path to the key table.
1156  *
1157  * @param[in]  write_access Open with readwrite access.
1158  *
1159  * @param[in]  keytab A pointer o the opended key table.
1160  *
1161  * The keytab pointer should be freed using krb5_kt_close().
1162  *
1163  * @return 0 on success, a Kerberos error code otherwise.
1164  */
1165 krb5_error_code smb_krb5_kt_open(krb5_context context,
1166                                  const char *keytab_name_req,
1167                                  bool write_access,
1168                                  krb5_keytab *keytab)
1169 {
1170         int cmp;
1171
1172         if (keytab_name_req == NULL) {
1173                 return KRB5_KT_BADNAME;
1174         }
1175
1176         if (keytab_name_req[0] == '/') {
1177                 goto open_keytab;
1178         }
1179
1180         cmp = strncmp(keytab_name_req, "FILE:/", 6);
1181         if (cmp == 0) {
1182                 goto open_keytab;
1183         }
1184
1185         cmp = strncmp(keytab_name_req, "WRFILE:/", 8);
1186         if (cmp == 0) {
1187                 goto open_keytab;
1188         }
1189
1190         return KRB5_KT_BADNAME;
1191
1192 open_keytab:
1193         return smb_krb5_kt_open_relative(context,
1194                                          keytab_name_req,
1195                                          write_access,
1196                                          keytab);
1197 }
1198
1199 /**
1200  * @brief Get a key table name.
1201  *
1202  * @param[in]  mem_ctx The talloc context to use for allocation.
1203  *
1204  * @param[in]  context The library context.
1205  *
1206  * @param[in]  keytab The key table to get the name from.
1207  *
1208  * @param[in]  keytab_name A talloc'ed string of the key table name.
1209  *
1210  * The talloc'ed name string needs to be freed with talloc_free().
1211  *
1212  * @return 0 on success, a Kerberos error code otherwise.
1213  */
1214 krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx,
1215                                      krb5_context context,
1216                                      krb5_keytab keytab,
1217                                      const char **keytab_name)
1218 {
1219         char keytab_string[MAX_KEYTAB_NAME_LEN];
1220         krb5_error_code ret = 0;
1221
1222         ret = krb5_kt_get_name(context, keytab,
1223                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1224         if (ret) {
1225                 return ret;
1226         }
1227
1228         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1229         if (!*keytab_name) {
1230                 return ENOMEM;
1231         }
1232
1233         return ret;
1234 }
1235
1236 /**
1237  * @brief Seek and delete old entries in a keytab based on the passed
1238  *        principal.
1239  *
1240  * @param[in]  context       The KRB5 context to use.
1241  *
1242  * @param[in]  keytab        The keytab to operate on.
1243  *
1244  * @param[in]  kvno          The kvnco to use.
1245  *
1246  * @param[in]  princ_s       The principal as a string to search for.
1247  *
1248  * @param[in]  princ         The principal as a krb5_principal to search for.
1249  *
1250  * @param[in]  flush         Weather to flush the complete keytab.
1251  *
1252  * @param[in]  keep_old_entries Keep the entry with the previous kvno.
1253  *
1254  * @retval 0 on Sucess
1255  *
1256  * @return An appropriate KRB5 error code.
1257  */
1258 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1259                                                         krb5_keytab keytab,
1260                                                         krb5_kvno kvno,
1261                                                         krb5_enctype enctype,
1262                                                         const char *princ_s,
1263                                                         krb5_principal princ,
1264                                                         bool flush,
1265                                                         bool keep_old_entries)
1266 {
1267         krb5_error_code ret;
1268         krb5_kt_cursor cursor;
1269         krb5_keytab_entry kt_entry;
1270         char *ktprinc = NULL;
1271         krb5_kvno old_kvno = kvno - 1;
1272         TALLOC_CTX *tmp_ctx;
1273
1274         ZERO_STRUCT(cursor);
1275         ZERO_STRUCT(kt_entry);
1276
1277         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1278         if (ret == KRB5_KT_END || ret == ENOENT ) {
1279                 /* no entries */
1280                 return 0;
1281         }
1282
1283         tmp_ctx = talloc_new(NULL);
1284         if (tmp_ctx == NULL) {
1285                 return ENOMEM;
1286         }
1287
1288         DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1289         while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1290                 bool name_ok = false;
1291                 krb5_enctype kt_entry_enctype =
1292                         smb_krb5_kt_get_enctype_from_entry(&kt_entry);
1293
1294                 if (!flush && (princ_s != NULL)) {
1295                         ret = smb_krb5_unparse_name(tmp_ctx, context,
1296                                                     kt_entry.principal,
1297                                                     &ktprinc);
1298                         if (ret) {
1299                                 DEBUG(1, (__location__
1300                                           ": smb_krb5_unparse_name failed "
1301                                           "(%s)\n", error_message(ret)));
1302                                 goto out;
1303                         }
1304
1305 #ifdef HAVE_KRB5_KT_COMPARE
1306                         name_ok = krb5_kt_compare(context, &kt_entry,
1307                                                   princ, 0, 0);
1308 #else
1309                         name_ok = (strcmp(ktprinc, princ_s) == 0);
1310 #endif
1311
1312                         if (!name_ok) {
1313                                 DEBUG(10, (__location__ ": ignoring keytab "
1314                                            "entry principal %s, kvno = %d\n",
1315                                            ktprinc, kt_entry.vno));
1316
1317                                 /* Not a match,
1318                                  * just free this entry and continue. */
1319                                 ret = smb_krb5_kt_free_entry(context,
1320                                                              &kt_entry);
1321                                 ZERO_STRUCT(kt_entry);
1322                                 if (ret) {
1323                                         DEBUG(1, (__location__
1324                                                   ": smb_krb5_kt_free_entry "
1325                                                   "failed (%s)\n",
1326                                                   error_message(ret)));
1327                                         goto out;
1328                                 }
1329
1330                                 TALLOC_FREE(ktprinc);
1331                                 continue;
1332                         }
1333
1334                         TALLOC_FREE(ktprinc);
1335                 }
1336
1337                 /*------------------------------------------------------------
1338                  * Save the entries with kvno - 1. This is what microsoft does
1339                  * to allow people with existing sessions that have kvno - 1
1340                  * to still work. Otherwise, when the password for the machine
1341                  * changes, all kerberizied sessions will 'break' until either
1342                  * the client reboots or the client's session key expires and
1343                  * they get a new session ticket with the new kvno.
1344                  * Some keytab files only store the kvno in 8bits, limit
1345                  * the compare accordingly.
1346                  */
1347
1348                 if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1349                         DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1350                                   "entry for principal: %s.\n",
1351                                   old_kvno, princ_s));
1352                         continue;
1353                 }
1354
1355                 if (keep_old_entries) {
1356                         DEBUG(5, (__location__ ": Saving old (kvno %d) "
1357                                   "entry for principal: %s.\n",
1358                                   kvno, princ_s));
1359                         continue;
1360                 }
1361
1362                 if (!flush &&
1363                     (kt_entry.vno == kvno) &&
1364                     (kt_entry_enctype != enctype))
1365                 {
1366                         DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
1367                                   "enctype [%d] for principal: %s.\n",
1368                                   kvno, kt_entry_enctype, princ_s));
1369                         continue;
1370                 }
1371
1372                 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1373                           "(kvno %d) - trying to remove it.\n",
1374                           princ_s, kt_entry.vno));
1375
1376                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1377                 ZERO_STRUCT(cursor);
1378                 if (ret) {
1379                         DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1380                                   "failed (%s)\n", error_message(ret)));
1381                         goto out;
1382                 }
1383                 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1384                 if (ret) {
1385                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1386                                   "failed (%s)\n", error_message(ret)));
1387                         goto out;
1388                 }
1389
1390                 DEBUG(5, (__location__ ": removed old entry for principal: "
1391                           "%s (kvno %d).\n", princ_s, kt_entry.vno));
1392
1393                 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1394                 if (ret) {
1395                         DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1396                                   "(%s)\n", error_message(ret)));
1397                         goto out;
1398                 }
1399                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1400                 ZERO_STRUCT(kt_entry);
1401                 if (ret) {
1402                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1403                                   "failed (%s)\n", error_message(ret)));
1404                         goto out;
1405                 }
1406         }
1407
1408 out:
1409         talloc_free(tmp_ctx);
1410         if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
1411                 smb_krb5_kt_free_entry(context, &kt_entry);
1412         }
1413         if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) {
1414                 krb5_kt_end_seq_get(context, keytab, &cursor);
1415         }
1416         return ret;
1417 }
1418
1419 /**
1420  * @brief Add a keytab entry for the given principal
1421  *
1422  * @param[in]  context       The krb5 context to use.
1423  *
1424  * @param[in]  keytab        The keytab to add the entry to.
1425  *
1426  * @param[in]  kvno          The kvno to use.
1427  *
1428  * @param[in]  princ_s       The principal as a string.
1429  *
1430  * @param[in]  salt_principal The salt principal to salt the password with.
1431  *                            Only needed for keys which support salting.
1432  *                            If no salt is used set no_salt to false and
1433  *                            pass NULL here.
1434  *
1435  * @param[in]  enctype        The encryption type of the keytab entry.
1436  *
1437  * @param[in]  password       The password of the keytab entry.
1438  *
1439  * @param[in]  no_salt        If the password should not be salted. Normally
1440  *                            this is only set to false for encryption types
1441  *                            which do not support salting like RC4.
1442  *
1443  * @param[in]  keep_old_entries Wether to keep or delte old keytab entries.
1444  *
1445  * @retval 0 on Success
1446  *
1447  * @return A corresponding KRB5 error code.
1448  *
1449  * @see smb_krb5_kt_open()
1450  */
1451 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1452                                       krb5_keytab keytab,
1453                                       krb5_kvno kvno,
1454                                       const char *princ_s,
1455                                       const char *salt_principal,
1456                                       krb5_enctype enctype,
1457                                       krb5_data *password,
1458                                       bool no_salt,
1459                                       bool keep_old_entries)
1460 {
1461         krb5_error_code ret;
1462         krb5_keytab_entry kt_entry;
1463         krb5_principal princ = NULL;
1464         krb5_keyblock *keyp;
1465
1466         ZERO_STRUCT(kt_entry);
1467
1468         ret = smb_krb5_parse_name(context, princ_s, &princ);
1469         if (ret) {
1470                 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1471                           "failed (%s)\n", princ_s, error_message(ret)));
1472                 goto out;
1473         }
1474
1475         /* Seek and delete old keytab entries */
1476         ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1477                                                       keytab,
1478                                                       kvno,
1479                                                       enctype,
1480                                                       princ_s,
1481                                                       princ,
1482                                                       false,
1483                                                       keep_old_entries);
1484         if (ret) {
1485                 goto out;
1486         }
1487
1488         /* If we get here, we have deleted all the old entries with kvno's
1489          * not equal to the current kvno-1. */
1490
1491         keyp = KRB5_KT_KEY(&kt_entry);
1492
1493         if (no_salt) {
1494                 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1495                 if (KRB5_KEY_DATA(keyp) == NULL) {
1496                         ret = ENOMEM;
1497                         goto out;
1498                 }
1499                 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1500                 KRB5_KEY_LENGTH(keyp) = password->length;
1501                 KRB5_KEY_TYPE(keyp) = enctype;
1502         } else {
1503                 krb5_principal salt_princ = NULL;
1504
1505                 /* Now add keytab entries for all encryption types */
1506                 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1507                 if (ret) {
1508                         DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1509                                     salt_principal, error_message(ret));
1510                         goto out;
1511                 }
1512
1513                 ret = smb_krb5_create_key_from_string(context,
1514                                                       salt_princ,
1515                                                       NULL,
1516                                                       password,
1517                                                       enctype,
1518                                                       keyp);
1519                 krb5_free_principal(context, salt_princ);
1520                 if (ret != 0) {
1521                         goto out;
1522                 }
1523         }
1524
1525         kt_entry.principal = princ;
1526         kt_entry.vno       = kvno;
1527
1528         DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1529                   "encryption type (%d) and version (%d)\n",
1530                   princ_s, enctype, kt_entry.vno));
1531         ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1532         krb5_free_keyblock_contents(context, keyp);
1533         ZERO_STRUCT(kt_entry);
1534         if (ret) {
1535                 DEBUG(1, (__location__ ": adding entry to keytab "
1536                           "failed (%s)\n", error_message(ret)));
1537                 goto out;
1538         }
1539
1540 out:
1541         if (princ) {
1542                 krb5_free_principal(context, princ);
1543         }
1544
1545         return ret;
1546 }
1547
1548 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1549     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1550     defined(HAVE_KRB5_GET_CREDS)
1551 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1552                                                              krb5_ccache ccache,
1553                                                              krb5_principal me,
1554                                                              krb5_principal server,
1555                                                              krb5_principal impersonate_princ,
1556                                                              krb5_creds **out_creds)
1557 {
1558         krb5_error_code ret;
1559         krb5_get_creds_opt opt;
1560
1561         ret = krb5_get_creds_opt_alloc(context, &opt);
1562         if (ret) {
1563                 goto done;
1564         }
1565         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1566
1567         if (impersonate_princ) {
1568                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1569                                                          impersonate_princ);
1570                 if (ret) {
1571                         goto done;
1572                 }
1573         }
1574
1575         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1576         if (ret) {
1577                 goto done;
1578         }
1579
1580  done:
1581         if (opt) {
1582                 krb5_get_creds_opt_free(context, opt);
1583         }
1584         return ret;
1585 }
1586 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1587
1588 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1589
1590 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1591 krb5_error_code KRB5_CALLCONV
1592 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1593                               krb5_ccache ccache, krb5_creds *in_creds,
1594                               krb5_data *subject_cert,
1595                               krb5_creds **out_creds);
1596 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1597
1598 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1599                                                          krb5_ccache ccache,
1600                                                          krb5_principal me,
1601                                                          krb5_principal server,
1602                                                          krb5_principal impersonate_princ,
1603                                                          krb5_creds **out_creds)
1604 {
1605         krb5_error_code ret;
1606         krb5_creds in_creds;
1607
1608         ZERO_STRUCT(in_creds);
1609
1610         if (impersonate_princ) {
1611
1612                 in_creds.server = me;
1613                 in_creds.client = impersonate_princ;
1614
1615                 ret = krb5_get_credentials_for_user(context,
1616                                                     0, /* krb5_flags options */
1617                                                     ccache,
1618                                                     &in_creds,
1619                                                     NULL, /* krb5_data *subject_cert */
1620                                                     out_creds);
1621         } else {
1622                 in_creds.client = me;
1623                 in_creds.server = server;
1624
1625                 ret = krb5_get_credentials(context, 0, ccache,
1626                                            &in_creds, out_creds);
1627         }
1628
1629         return ret;
1630 }
1631 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1632
1633 /*
1634  * smb_krb5_get_credentials
1635  *
1636  * @brief Get krb5 credentials for a server
1637  *
1638  * @param[in] context           An initialized krb5_context
1639  * @param[in] ccache            An initialized krb5_ccache
1640  * @param[in] me                The krb5_principal of the caller
1641  * @param[in] server            The krb5_principal of the requested service
1642  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1643  * @param[out] out_creds        The returned krb5_creds structure
1644  * @return krb5_error_code
1645  *
1646  */
1647 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1648                                          krb5_ccache ccache,
1649                                          krb5_principal me,
1650                                          krb5_principal server,
1651                                          krb5_principal impersonate_princ,
1652                                          krb5_creds **out_creds)
1653 {
1654         krb5_error_code ret;
1655         krb5_creds *creds = NULL;
1656
1657         if (out_creds != NULL) {
1658                 *out_creds = NULL;
1659         }
1660
1661         if (impersonate_princ) {
1662 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1663                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1664 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1665                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1666 #else
1667                 ret = ENOTSUP;
1668 #endif
1669         } else {
1670                 krb5_creds in_creds;
1671
1672                 ZERO_STRUCT(in_creds);
1673
1674                 in_creds.client = me;
1675                 in_creds.server = server;
1676
1677                 ret = krb5_get_credentials(context, 0, ccache,
1678                                            &in_creds, &creds);
1679         }
1680         if (ret) {
1681                 goto done;
1682         }
1683
1684         if (out_creds) {
1685                 *out_creds = creds;
1686         }
1687
1688  done:
1689         if (creds && ret) {
1690                 krb5_free_creds(context, creds);
1691         }
1692
1693         return ret;
1694 }
1695
1696 /**
1697  * @brief Initialize a krb5_keyblock with the given data.
1698  *
1699  * Initialized a new keyblock, allocates the contents fo the key and
1700  * copies the data into the keyblock.
1701  *
1702  * @param[in]  context  The library context
1703  *
1704  * @param[in]  enctype  The encryption type.
1705  *
1706  * @param[in]  data     The date to initialize the keyblock with.
1707  *
1708  * @param[in]  length   The length of the keyblock.
1709  *
1710  * @param[in]  key      Newly allocated keyblock structure.
1711  *
1712  * The key date must be freed using krb5_free_keyblock_contents() when it is
1713  * no longer needed.
1714  *
1715  * @return 0 on success, a Kerberos error code otherwise.
1716  */
1717 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1718                                                 krb5_enctype enctype,
1719                                                 const void *data,
1720                                                 size_t length,
1721                                                 krb5_keyblock *key)
1722 {
1723 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1724         return krb5_keyblock_init(context, enctype, data, length, key);
1725 #else
1726         memset(key, 0, sizeof(krb5_keyblock));
1727         KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1728         if (NULL == KRB5_KEY_DATA(key)) {
1729                 return ENOMEM;
1730         }
1731         memcpy(KRB5_KEY_DATA(key), data, length);
1732         KRB5_KEY_LENGTH(key) = length;
1733         KRB5_KEY_TYPE(key) = enctype;
1734         return 0;
1735 #endif
1736 }
1737
1738 /**
1739  * @brief Simulate a kinit by putting the tgt in the given credential cache.
1740  *
1741  * This function uses a keyblock rather than needingthe original password.
1742  *
1743  * @param[in]  ctx      The library context
1744  *
1745  * @param[in]  cc       The credential cache to put the tgt in.
1746  *
1747  * @param[in]  principal The client princial
1748  *
1749  * @param[in]  keyblock  The keyblock to use.
1750  *
1751  * @param[in]  target_service The service name of the initial credentials (or NULL).
1752  *
1753  * @param[in]  krb_options Initial credential options.
1754  *
1755  * @param[in]  expire_time    A pointer to store the experation time of the
1756  *                            credentials (or NULL).
1757  *
1758  * @param[in]  kdc_time       A pointer to store the time when the ticket becomes
1759  *                            valid (or NULL).
1760  *
1761  * @return 0 on success, a Kerberos error code otherwise.
1762  */
1763 krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx,
1764                                                krb5_ccache cc,
1765                                                krb5_principal principal,
1766                                                krb5_keyblock *keyblock,
1767                                                const char *target_service,
1768                                                krb5_get_init_creds_opt *krb_options,
1769                                                time_t *expire_time,
1770                                                time_t *kdc_time)
1771 {
1772         krb5_error_code code = 0;
1773         krb5_creds my_creds;
1774
1775 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1776         code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1777                                             keyblock, 0, target_service,
1778                                             krb_options);
1779 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1780 {
1781 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1782         char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1783         krb5_keytab_entry entry;
1784         krb5_keytab keytab;
1785         mode_t mask;
1786
1787         memset(&entry, 0, sizeof(entry));
1788         entry.principal = principal;
1789         *(KRB5_KT_KEY(&entry)) = *keyblock;
1790
1791         memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1792         mask = umask(S_IRWXO | S_IRWXG);
1793         mktemp(tmp_name);
1794         umask(mask);
1795         if (tmp_name[0] == 0) {
1796                 return KRB5_KT_BADNAME;
1797         }
1798         code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1799         if (code) {
1800                 return code;
1801         }
1802
1803         code = krb5_kt_add_entry(ctx, keytab, &entry);
1804         if (code) {
1805                 (void)krb5_kt_close(ctx, keytab);
1806                 goto done;
1807         }
1808
1809         code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1810                                           keytab, 0, target_service,
1811                                           krb_options);
1812         (void)krb5_kt_close(ctx, keytab);
1813 }
1814 #else
1815 #error krb5_get_init_creds_keyblock not available!
1816 #endif
1817         if (code) {
1818                 return code;
1819         }
1820
1821 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1822         /*
1823          * We need to store the principal as returned from the KDC to the
1824          * credentials cache. If we don't do that the KRB5 library is not
1825          * able to find the tickets it is looking for
1826          */
1827         principal = my_creds.client;
1828 #endif
1829         code = krb5_cc_initialize(ctx, cc, principal);
1830         if (code) {
1831                 goto done;
1832         }
1833
1834         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1835         if (code) {
1836                 goto done;
1837         }
1838
1839         if (expire_time) {
1840                 *expire_time = (time_t) my_creds.times.endtime;
1841         }
1842
1843         if (kdc_time) {
1844                 *kdc_time = (time_t) my_creds.times.starttime;
1845         }
1846
1847         code = 0;
1848 done:
1849         krb5_free_cred_contents(ctx, &my_creds);
1850         return code;
1851 }
1852
1853 /**
1854  * @brief Simulate a kinit by putting the tgt in the given credential cache.
1855  *
1856  * @param[in]  ctx      The library context
1857  *
1858  * @param[in]  cc       The credential cache to put the tgt in.
1859  *
1860  * @param[in]  principal The client princial
1861  *
1862  * @param[in]  password  The password (or NULL).
1863  *
1864  * @param[in]  target_service The service name of the initial credentials (or NULL).
1865  *
1866  * @param[in]  krb_options Initial credential options.
1867  *
1868  * @param[in]  expire_time    A pointer to store the experation time of the
1869  *                            credentials (or NULL).
1870  *
1871  * @param[in]  kdc_time       A pointer to store the time when the ticket becomes
1872  *                            valid (or NULL).
1873  *
1874  * @return 0 on success, a Kerberos error code otherwise.
1875  */
1876 krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx,
1877                                                krb5_ccache cc,
1878                                                krb5_principal principal,
1879                                                const char *password,
1880                                                const char *target_service,
1881                                                krb5_get_init_creds_opt *krb_options,
1882                                                time_t *expire_time,
1883                                                time_t *kdc_time)
1884 {
1885         krb5_error_code code = 0;
1886         krb5_creds my_creds;
1887
1888         code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1889                                             password, NULL, NULL, 0,
1890                                             target_service, krb_options);
1891         if (code) {
1892                 return code;
1893         }
1894
1895 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1896         /*
1897          * We need to store the principal as returned from the KDC to the
1898          * credentials cache. If we don't do that the KRB5 library is not
1899          * able to find the tickets it is looking for
1900          */
1901         principal = my_creds.client;
1902 #endif
1903         code = krb5_cc_initialize(ctx, cc, principal);
1904         if (code) {
1905                 goto done;
1906         }
1907
1908         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1909         if (code) {
1910                 goto done;
1911         }
1912
1913         if (expire_time) {
1914                 *expire_time = (time_t) my_creds.times.endtime;
1915         }
1916
1917         if (kdc_time) {
1918                 *kdc_time = (time_t) my_creds.times.starttime;
1919         }
1920
1921         code = 0;
1922 done:
1923         krb5_free_cred_contents(ctx, &my_creds);
1924         return code;
1925 }
1926
1927 #ifdef SAMBA4_USES_HEIMDAL
1928 /**
1929  * @brief Simulate a kinit by putting the tgt in the given credential cache.
1930  *
1931  * @param[in]  ctx      The library context
1932  *
1933  * @param[in]  cc       The credential cache to store the tgt in.
1934  *
1935  * @param[in]  principal The initial client princial.
1936  *
1937  * @param[in]  password  The password (or NULL).
1938  *
1939  * @param[in]  impersonate_principal The impersonatiion principal (or NULL).
1940  *
1941  * @param[in]  self_service The local service for S4U2Self if
1942  *                          impersonate_principal is specified).
1943  *
1944  * @param[in]  target_service The service name of the initial credentials
1945  *                            (kpasswd/REALM or a remote service). It defaults
1946  *                            to the krbtgt if NULL.
1947  *
1948  * @param[in]  krb_options Initial credential options.
1949  *
1950  * @param[in]  expire_time    A pointer to store the experation time of the
1951  *                            credentials (or NULL).
1952  *
1953  * @param[in]  kdc_time       A pointer to store the time when the ticket becomes
1954  *                            valid (or NULL).
1955  *
1956  * @return 0 on success, a Kerberos error code otherwise.
1957  */
1958 krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
1959                                            krb5_ccache store_cc,
1960                                            krb5_principal init_principal,
1961                                            const char *init_password,
1962                                            krb5_principal impersonate_principal,
1963                                            const char *self_service,
1964                                            const char *target_service,
1965                                            krb5_get_init_creds_opt *krb_options,
1966                                            time_t *expire_time,
1967                                            time_t *kdc_time)
1968 {
1969         krb5_error_code code = 0;
1970         krb5_get_creds_opt options;
1971         krb5_principal store_principal;
1972         krb5_creds store_creds;
1973         krb5_creds *s4u2self_creds;
1974         Ticket s4u2self_ticket;
1975         size_t s4u2self_ticketlen;
1976         krb5_creds *s4u2proxy_creds;
1977         krb5_principal self_princ;
1978         bool s4u2proxy;
1979         krb5_principal target_princ;
1980         krb5_ccache tmp_cc;
1981         const char *self_realm;
1982         const char *client_realm = NULL;
1983         krb5_principal blacklist_principal = NULL;
1984         krb5_principal whitelist_principal = NULL;
1985
1986         code = krb5_get_init_creds_password(ctx, &store_creds,
1987                                             init_principal,
1988                                             init_password,
1989                                             NULL, NULL,
1990                                             0,
1991                                             NULL,
1992                                             krb_options);
1993         if (code != 0) {
1994                 return code;
1995         }
1996
1997         store_principal = init_principal;
1998
1999         /*
2000          * We are trying S4U2Self now:
2001          *
2002          * As we do not want to expose our TGT in the
2003          * krb5_ccache, which is also holds the impersonated creds.
2004          *
2005          * Some low level krb5/gssapi function might use the TGT
2006          * identity and let the client act as our machine account.
2007          *
2008          * We need to avoid that and use a temporary krb5_ccache
2009          * in order to pass our TGT to the krb5_get_creds() function.
2010          */
2011         code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
2012         if (code != 0) {
2013                 krb5_free_cred_contents(ctx, &store_creds);
2014                 return code;
2015         }
2016
2017         code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
2018         if (code != 0) {
2019                 krb5_cc_destroy(ctx, tmp_cc);
2020                 krb5_free_cred_contents(ctx, &store_creds);
2021                 return code;
2022         }
2023
2024         code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
2025         if (code != 0) {
2026                 krb5_free_cred_contents(ctx, &store_creds);
2027                 krb5_cc_destroy(ctx, tmp_cc);
2028                 return code;
2029         }
2030
2031         /*
2032          * we need to remember the client principal of our
2033          * TGT and make sure the KDC does not return this
2034          * in the impersonated tickets. This can happen
2035          * if the KDC does not support S4U2Self and S4U2Proxy.
2036          */
2037         blacklist_principal = store_creds.client;
2038         store_creds.client = NULL;
2039         krb5_free_cred_contents(ctx, &store_creds);
2040
2041         /*
2042          * Check if we also need S4U2Proxy or if S4U2Self is
2043          * enough in order to get a ticket for the target.
2044          */
2045         if (target_service == NULL) {
2046                 s4u2proxy = false;
2047         } else if (strcmp(target_service, self_service) == 0) {
2048                 s4u2proxy = false;
2049         } else {
2050                 s4u2proxy = true;
2051         }
2052
2053         /*
2054          * For S4U2Self we need our own service principal,
2055          * which belongs to our own realm (available on
2056          * our client principal).
2057          */
2058         self_realm = krb5_principal_get_realm(ctx, init_principal);
2059
2060         code = krb5_parse_name(ctx, self_service, &self_princ);
2061         if (code != 0) {
2062                 krb5_free_principal(ctx, blacklist_principal);
2063                 krb5_cc_destroy(ctx, tmp_cc);
2064                 return code;
2065         }
2066
2067         code = krb5_principal_set_realm(ctx, self_princ, self_realm);
2068         if (code != 0) {
2069                 krb5_free_principal(ctx, blacklist_principal);
2070                 krb5_free_principal(ctx, self_princ);
2071                 krb5_cc_destroy(ctx, tmp_cc);
2072                 return code;
2073         }
2074
2075         code = krb5_get_creds_opt_alloc(ctx, &options);
2076         if (code != 0) {
2077                 krb5_free_principal(ctx, blacklist_principal);
2078                 krb5_free_principal(ctx, self_princ);
2079                 krb5_cc_destroy(ctx, tmp_cc);
2080                 return code;
2081         }
2082
2083         if (s4u2proxy) {
2084                 /*
2085                  * If we want S4U2Proxy, we need the forwardable flag
2086                  * on the S4U2Self ticket.
2087                  */
2088                 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2089         }
2090
2091         code = krb5_get_creds_opt_set_impersonate(ctx, options,
2092                                                   impersonate_principal);
2093         if (code != 0) {
2094                 krb5_get_creds_opt_free(ctx, options);
2095                 krb5_free_principal(ctx, blacklist_principal);
2096                 krb5_free_principal(ctx, self_princ);
2097                 krb5_cc_destroy(ctx, tmp_cc);
2098                 return code;
2099         }
2100
2101         code = krb5_get_creds(ctx, options, tmp_cc,
2102                               self_princ, &s4u2self_creds);
2103         krb5_get_creds_opt_free(ctx, options);
2104         krb5_free_principal(ctx, self_princ);
2105         if (code != 0) {
2106                 krb5_free_principal(ctx, blacklist_principal);
2107                 krb5_cc_destroy(ctx, tmp_cc);
2108                 return code;
2109         }
2110
2111         if (!s4u2proxy) {
2112                 krb5_cc_destroy(ctx, tmp_cc);
2113
2114                 /*
2115                  * Now make sure we store the impersonated principal
2116                  * and creds instead of the TGT related stuff
2117                  * in the krb5_ccache of the caller.
2118                  */
2119                 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
2120                                                 &store_creds);
2121                 krb5_free_creds(ctx, s4u2self_creds);
2122                 if (code != 0) {
2123                         return code;
2124                 }
2125
2126                 /*
2127                  * It's important to store the principal the KDC
2128                  * returned, as otherwise the caller would not find
2129                  * the S4U2Self ticket in the krb5_ccache lookup.
2130                  */
2131                 store_principal = store_creds.client;
2132                 goto store;
2133         }
2134
2135         /*
2136          * We are trying S4U2Proxy:
2137          *
2138          * We need the ticket from the S4U2Self step
2139          * and our TGT in order to get the delegated ticket.
2140          */
2141         code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
2142                              s4u2self_creds->ticket.length,
2143                              &s4u2self_ticket,
2144                              &s4u2self_ticketlen);
2145         if (code != 0) {
2146                 krb5_free_creds(ctx, s4u2self_creds);
2147                 krb5_free_principal(ctx, blacklist_principal);
2148                 krb5_cc_destroy(ctx, tmp_cc);
2149                 return code;
2150         }
2151
2152         /*
2153          * we need to remember the client principal of the
2154          * S4U2Self stage and as it needs to match the one we
2155          * will get for the S4U2Proxy stage. We need this
2156          * in order to detect KDCs which does not support S4U2Proxy.
2157          */
2158         whitelist_principal = s4u2self_creds->client;
2159         s4u2self_creds->client = NULL;
2160         krb5_free_creds(ctx, s4u2self_creds);
2161
2162         /*
2163          * For S4U2Proxy we also got a target service principal,
2164          * which also belongs to our own realm (available on
2165          * our client principal).
2166          */
2167         code = krb5_parse_name(ctx, target_service, &target_princ);
2168         if (code != 0) {
2169                 free_Ticket(&s4u2self_ticket);
2170                 krb5_free_principal(ctx, whitelist_principal);
2171                 krb5_free_principal(ctx, blacklist_principal);
2172                 krb5_cc_destroy(ctx, tmp_cc);
2173                 return code;
2174         }
2175
2176         code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2177         if (code != 0) {
2178                 free_Ticket(&s4u2self_ticket);
2179                 krb5_free_principal(ctx, target_princ);
2180                 krb5_free_principal(ctx, whitelist_principal);
2181                 krb5_free_principal(ctx, blacklist_principal);
2182                 krb5_cc_destroy(ctx, tmp_cc);
2183                 return code;
2184         }
2185
2186         code = krb5_get_creds_opt_alloc(ctx, &options);
2187         if (code != 0) {
2188                 free_Ticket(&s4u2self_ticket);
2189                 krb5_free_principal(ctx, target_princ);
2190                 krb5_free_principal(ctx, whitelist_principal);
2191                 krb5_free_principal(ctx, blacklist_principal);
2192                 krb5_cc_destroy(ctx, tmp_cc);
2193                 return code;
2194         }
2195
2196         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2197         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2198
2199         code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2200         free_Ticket(&s4u2self_ticket);
2201         if (code != 0) {
2202                 krb5_get_creds_opt_free(ctx, options);
2203                 krb5_free_principal(ctx, target_princ);
2204                 krb5_free_principal(ctx, whitelist_principal);
2205                 krb5_free_principal(ctx, blacklist_principal);
2206                 krb5_cc_destroy(ctx, tmp_cc);
2207                 return code;
2208         }
2209
2210         code = krb5_get_creds(ctx, options, tmp_cc,
2211                               target_princ, &s4u2proxy_creds);
2212         krb5_get_creds_opt_free(ctx, options);
2213         krb5_free_principal(ctx, target_princ);
2214         krb5_cc_destroy(ctx, tmp_cc);
2215         if (code != 0) {
2216                 krb5_free_principal(ctx, whitelist_principal);
2217                 krb5_free_principal(ctx, blacklist_principal);
2218                 return code;
2219         }
2220
2221         /*
2222          * Now make sure we store the impersonated principal
2223          * and creds instead of the TGT related stuff
2224          * in the krb5_ccache of the caller.
2225          */
2226         code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2227                                         &store_creds);
2228         krb5_free_creds(ctx, s4u2proxy_creds);
2229         if (code != 0) {
2230                 krb5_free_principal(ctx, whitelist_principal);
2231                 krb5_free_principal(ctx, blacklist_principal);
2232                 return code;
2233         }
2234
2235         /*
2236          * It's important to store the principal the KDC
2237          * returned, as otherwise the caller would not find
2238          * the S4U2Self ticket in the krb5_ccache lookup.
2239          */
2240         store_principal = store_creds.client;
2241
2242  store:
2243         if (blacklist_principal &&
2244             krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2245                 char *sp = NULL;
2246                 char *ip = NULL;
2247
2248                 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2249                 if (code != 0) {
2250                         sp = NULL;
2251                 }
2252                 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2253                 if (code != 0) {
2254                         ip = NULL;
2255                 }
2256                 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2257                           "KDC returned self principal[%s] while impersonating [%s]\n",
2258                           sp?sp:"<no memory>",
2259                           ip?ip:"<no memory>"));
2260
2261                 SAFE_FREE(sp);
2262                 SAFE_FREE(ip);
2263
2264                 krb5_free_principal(ctx, whitelist_principal);
2265                 krb5_free_principal(ctx, blacklist_principal);
2266                 krb5_free_cred_contents(ctx, &store_creds);
2267                 return KRB5_FWD_BAD_PRINCIPAL;
2268         }
2269         if (blacklist_principal) {
2270                 krb5_free_principal(ctx, blacklist_principal);
2271         }
2272
2273         if (whitelist_principal &&
2274             !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2275                 char *sp = NULL;
2276                 char *ep = NULL;
2277
2278                 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2279                 if (code != 0) {
2280                         sp = NULL;
2281                 }
2282                 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2283                 if (code != 0) {
2284                         ep = NULL;
2285                 }
2286                 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2287                           "KDC returned wrong principal[%s] we expected [%s]\n",
2288                           sp?sp:"<no memory>",
2289                           ep?ep:"<no memory>"));
2290
2291                 SAFE_FREE(sp);
2292                 SAFE_FREE(ep);
2293
2294                 krb5_free_principal(ctx, whitelist_principal);
2295                 krb5_free_cred_contents(ctx, &store_creds);
2296                 return KRB5_FWD_BAD_PRINCIPAL;
2297         }
2298         if (whitelist_principal) {
2299                 krb5_free_principal(ctx, whitelist_principal);
2300         }
2301
2302         code = krb5_cc_initialize(ctx, store_cc, store_principal);
2303         if (code != 0) {
2304                 krb5_free_cred_contents(ctx, &store_creds);
2305                 return code;
2306         }
2307
2308         code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2309         if (code != 0) {
2310                 krb5_free_cred_contents(ctx, &store_creds);
2311                 return code;
2312         }
2313
2314         client_realm = krb5_principal_get_realm(ctx, store_creds.client);
2315         if (client_realm != NULL) {
2316                 /*
2317                  * Because the CANON flag doesn't have any impact
2318                  * on the impersonate_principal => store_creds.client
2319                  * realm mapping. We need to store the credentials twice,
2320                  * once with the returned realm and once with the
2321                  * realm of impersonate_principal.
2322                  */
2323                 code = krb5_principal_set_realm(ctx, store_creds.server,
2324                                                 client_realm);
2325                 if (code != 0) {
2326                         krb5_free_cred_contents(ctx, &store_creds);
2327                         return code;
2328                 }
2329
2330                 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2331                 if (code != 0) {
2332                         krb5_free_cred_contents(ctx, &store_creds);
2333                         return code;
2334                 }
2335         }
2336
2337         if (expire_time) {
2338                 *expire_time = (time_t) store_creds.times.endtime;
2339         }
2340
2341         if (kdc_time) {
2342                 *kdc_time = (time_t) store_creds.times.starttime;
2343         }
2344
2345         krb5_free_cred_contents(ctx, &store_creds);
2346
2347         return 0;
2348 }
2349 #endif
2350
2351 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2352 /**
2353  * @brief Create a principal name using a variable argument list.
2354  *
2355  * @param[in]  context  The library context.
2356  *
2357  * @param[inout]  principal A pointer to the principal structure.
2358  *
2359  * @param[in]  _realm    The realm to use. If NULL then the function will
2360  *                       get the default realm name.
2361  *
2362  * @param[in]  ...       A list of 'char *' components, ending with NULL.
2363  *
2364  * Use krb5_free_principal() to free the principal when it is no longer needed.
2365  *
2366  * @return 0 on success, a Kerberos error code otherwise.
2367  */
2368 krb5_error_code smb_krb5_make_principal(krb5_context context,
2369                                         krb5_principal *principal,
2370                                         const char *_realm, ...)
2371 {
2372         krb5_error_code code;
2373         bool free_realm;
2374         char *realm;
2375         va_list ap;
2376
2377         if (_realm) {
2378                 realm = discard_const_p(char, _realm);
2379                 free_realm = false;
2380         } else {
2381                 code = krb5_get_default_realm(context, &realm);
2382                 if (code) {
2383                         return code;
2384                 }
2385                 free_realm = true;
2386         }
2387
2388         va_start(ap, _realm);
2389         code = krb5_build_principal_alloc_va(context, principal,
2390                                              strlen(realm), realm,
2391                                              ap);
2392         va_end(ap);
2393
2394         if (free_realm) {
2395                 krb5_free_default_realm(context, realm);
2396         }
2397
2398         return code;
2399 }
2400 #endif
2401
2402 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2403 /**
2404  * @brief Get the lifetime of the initial ticket in the cache.
2405  *
2406  * @param[in]  context  The kerberos context.
2407  *
2408  * @param[in]  id       The credential cache to get the ticket lifetime.
2409  *
2410  * @param[out] t        A pointer to a time value to store the lifetime.
2411  *
2412  * @return              0 on success, a krb5_error_code on error.
2413  */
2414 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2415                                          krb5_ccache id,
2416                                          time_t *t)
2417 {
2418         krb5_cc_cursor cursor;
2419         krb5_error_code kerr;
2420         krb5_creds cred;
2421         krb5_timestamp now;
2422
2423         *t = 0;
2424
2425         kerr = krb5_timeofday(context, &now);
2426         if (kerr) {
2427                 return kerr;
2428         }
2429
2430         kerr = krb5_cc_start_seq_get(context, id, &cursor);
2431         if (kerr) {
2432                 return kerr;
2433         }
2434
2435         while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2436 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2437                 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2438 #else
2439                 if (cred.flags.b.initial) {
2440 #endif
2441                         if (now < cred.times.endtime) {
2442                                 *t = (time_t) (cred.times.endtime - now);
2443                         }
2444                         krb5_free_cred_contents(context, &cred);
2445                         break;
2446                 }
2447                 krb5_free_cred_contents(context, &cred);
2448         }
2449
2450         krb5_cc_end_seq_get(context, id, &cursor);
2451
2452         return kerr;
2453 }
2454 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2455
2456 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2457 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2458 {
2459         free_Checksum(cksum);
2460 }
2461 #endif
2462
2463 /**
2464  * @brief Compute a checksum operating on a keyblock.
2465  *
2466  * This function computes a checksum over a PAC using the keyblock for a keyed
2467  * checksum.
2468  *
2469  * @param[in]  mem_ctx A talloc context to alocate the signature on.
2470  *
2471  * @param[in]  pac_data The PAC as input.
2472  *
2473  * @param[in]  context  The library context.
2474  *
2475  * @param[in]  keyblock Encryption key for a keyed checksum.
2476  *
2477  * @param[out] sig_type The checksum type
2478  *
2479  * @param[out] sig_blob The talloc'ed checksum
2480  *
2481  * The caller must free the sig_blob with talloc_free() when it is not needed
2482  * anymore.
2483  *
2484  * @return 0 on success, a Kerberos error code otherwise.
2485  */
2486 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2487                                            DATA_BLOB *pac_data,
2488                                            krb5_context context,
2489                                            const krb5_keyblock *keyblock,
2490                                            uint32_t *sig_type,
2491                                            DATA_BLOB *sig_blob)
2492 {
2493         krb5_error_code ret;
2494         krb5_checksum cksum;
2495 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2496         krb5_crypto crypto;
2497
2498
2499         ret = krb5_crypto_init(context,
2500                                keyblock,
2501                                0,
2502                                &crypto);
2503         if (ret) {
2504                 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2505                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2506                 return ret;
2507         }
2508         ret = krb5_create_checksum(context,
2509                                    crypto,
2510                                    KRB5_KU_OTHER_CKSUM,
2511                                    0,
2512                                    pac_data->data,
2513                                    pac_data->length,
2514                                    &cksum);
2515         if (ret) {
2516                 DEBUG(2, ("PAC Verification failed: %s\n",
2517                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2518         }
2519
2520         krb5_crypto_destroy(context, crypto);
2521
2522         if (ret) {
2523                 return ret;
2524         }
2525
2526         *sig_type = cksum.cksumtype;
2527         *sig_blob = data_blob_talloc(mem_ctx,
2528                                         cksum.checksum.data,
2529                                         cksum.checksum.length);
2530 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2531         krb5_data input;
2532
2533         input.data = (char *)pac_data->data;
2534         input.length = pac_data->length;
2535
2536         ret = krb5_c_make_checksum(context,
2537                                    0,
2538                                    keyblock,
2539                                    KRB5_KEYUSAGE_APP_DATA_CKSUM,
2540                                    &input,
2541                                    &cksum);
2542         if (ret) {
2543                 DEBUG(2, ("PAC Verification failed: %s\n",
2544                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2545                 return ret;
2546         }
2547
2548         *sig_type = cksum.checksum_type;
2549         *sig_blob = data_blob_talloc(mem_ctx,
2550                                         cksum.contents,
2551                                         cksum.length);
2552
2553 #else
2554 #error krb5_create_checksum or krb5_c_make_checksum not available
2555 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2556         smb_krb5_free_checksum_contents(context, &cksum);
2557
2558         return 0;
2559 }
2560
2561
2562 /**
2563  * @brief Get realm of a principal
2564  *
2565  * @param[in] context   The library context
2566  *
2567  * @param[in] principal The principal to get the realm from.
2568  *
2569  * @return An allocated string with the realm or NULL if an error occurred.
2570  *
2571  * The caller must free the realm string with free() if not needed anymore.
2572  */
2573 char *smb_krb5_principal_get_realm(krb5_context context,
2574                                    krb5_const_principal principal)
2575 {
2576 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2577         return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
2578 #elif defined(krb5_princ_realm) /* MIT */
2579         krb5_data *realm;
2580         realm = discard_const_p(krb5_data,
2581                                 krb5_princ_realm(context, principal));
2582         return strndup(realm->data, realm->length);
2583 #else
2584 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2585 #endif
2586 }
2587
2588 /**
2589  * @brief Get realm of a principal
2590  *
2591  * @param[in] context   The library context
2592  *
2593  * @param[in] principal The principal to set the realm
2594  *
2595  * @param[in] realm     The realm as a string to set.
2596  *
2597  * @retur 0 on success, a Kerberos error code otherwise.
2598  */
2599 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2600                                              krb5_principal principal,
2601                                              const char *realm)
2602 {
2603 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2604         return krb5_principal_set_realm(context, principal, realm);
2605 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2606         krb5_error_code ret;
2607         krb5_data data;
2608         krb5_data *old_data;
2609
2610         old_data = krb5_princ_realm(context, principal);
2611
2612         ret = smb_krb5_copy_data_contents(&data,
2613                                           realm,
2614                                           strlen(realm));
2615         if (ret) {
2616                 return ret;
2617         }
2618
2619         /* free realm before setting */
2620         free(old_data->data);
2621
2622         krb5_princ_set_realm(context, principal, &data);
2623
2624         return ret;
2625 #else
2626 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2627 #endif
2628 }
2629
2630
2631 /************************************************************************
2632  Routine to get the default realm from the kerberos credentials cache.
2633  Caller must free if the return value is not NULL.
2634 ************************************************************************/
2635
2636 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2637 {
2638         char *realm = NULL;
2639         krb5_context ctx = NULL;
2640         krb5_ccache cc = NULL;
2641         krb5_principal princ = NULL;
2642
2643         initialize_krb5_error_table();
2644         if (krb5_init_context(&ctx)) {
2645                 return NULL;
2646         }
2647
2648         DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2649                 "Trying to read krb5 cache: %s\n",
2650                 krb5_cc_default_name(ctx)));
2651         if (krb5_cc_default(ctx, &cc)) {
2652                 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2653                         "failed to read default cache\n"));
2654                 goto out;
2655         }
2656         if (krb5_cc_get_principal(ctx, cc, &princ)) {
2657                 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2658                         "failed to get default principal\n"));
2659                 goto out;
2660         }
2661
2662 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2663         realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2664 #elif defined(HAVE_KRB5_PRINC_REALM)
2665         {
2666                 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2667                 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2668         }
2669 #endif
2670
2671   out:
2672
2673         if (ctx) {
2674                 if (princ) {
2675                         krb5_free_principal(ctx, princ);
2676                 }
2677                 if (cc) {
2678                         krb5_cc_close(ctx, cc);
2679                 }
2680                 krb5_free_context(ctx);
2681         }
2682
2683         return realm;
2684 }
2685
2686 /************************************************************************
2687  Routine to get the realm from a given DNS name.
2688 ************************************************************************/
2689
2690 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2691                                                 const char *hostname,
2692                                                 const char *client_realm)
2693 {
2694 #if defined(HAVE_KRB5_REALM_TYPE)
2695         /* Heimdal. */
2696         krb5_realm *realm_list = NULL;
2697 #else
2698         /* MIT */
2699         char **realm_list = NULL;
2700 #endif
2701         char *realm = NULL;
2702         krb5_error_code kerr;
2703         krb5_context ctx = NULL;
2704
2705         initialize_krb5_error_table();
2706         if (krb5_init_context(&ctx)) {
2707                 return NULL;
2708         }
2709
2710         kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2711         if (kerr != 0) {
2712                 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2713                         "failed %s\n",
2714                         hostname ? hostname : "(NULL)",
2715                         error_message(kerr) ));
2716                 goto out;
2717         }
2718
2719         if (realm_list != NULL &&
2720             realm_list[0] != NULL &&
2721             realm_list[0][0] != '\0') {
2722                 realm = talloc_strdup(mem_ctx, realm_list[0]);
2723                 if (realm == NULL) {
2724                         goto out;
2725                 }
2726         } else {
2727                 const char *p = NULL;
2728
2729                 /*
2730                  * "dc6.samba2003.example.com"
2731                  * returns a realm of "SAMBA2003.EXAMPLE.COM"
2732                  *
2733                  * "dc6." returns realm as NULL
2734                  */
2735                 p = strchr_m(hostname, '.');
2736                 if (p != NULL && p[1] != '\0') {
2737                         realm = talloc_strdup_upper(mem_ctx, p + 1);
2738                         if (realm == NULL) {
2739                                 goto out;
2740                         }
2741                 }
2742         }
2743
2744         if (realm == NULL) {
2745                 realm = talloc_strdup(mem_ctx, client_realm);
2746         }
2747
2748   out:
2749
2750         if (ctx) {
2751                 if (realm_list) {
2752                         krb5_free_host_realm(ctx, realm_list);
2753                         realm_list = NULL;
2754                 }
2755                 krb5_free_context(ctx);
2756                 ctx = NULL;
2757         }
2758         return realm;
2759 }
2760
2761 /**
2762  * @brief Get the principal as a string from the service hostname.
2763  *
2764  * @param[in]  mem_ctx  The talloc context
2765  *
2766  * @param[in]  service  The service name
2767  *
2768  * @param[in]  remote_name The remote name
2769  *
2770  * @param[in]  default_realm The default_realm if we cannot get it from the
2771  *                           hostname or netbios name.
2772  *
2773  * @return A talloc'ed principal string or NULL if an error occurred.
2774  *
2775  * The caller needs to free the principal with talloc_free() if it isn't needed
2776  * anymore.
2777  */
2778 char *smb_krb5_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2779                                                    const char *service,
2780                                                    const char *remote_name,
2781                                                    const char *default_realm)
2782 {
2783         char *realm = NULL;
2784         char *host = NULL;
2785         char *principal;
2786         host = strchr_m(remote_name, '.');
2787         if (host) {
2788                 /* DNS name. */
2789                 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2790                                                          remote_name,
2791                                                          default_realm);
2792         } else {
2793                 /* NetBIOS name - use our realm. */
2794                 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2795         }
2796
2797         if (realm == NULL || *realm == '\0') {
2798                 realm = talloc_strdup(talloc_tos(), default_realm);
2799                 if (!realm) {
2800                         return NULL;
2801                 }
2802                 DEBUG(3,("Cannot get realm from, "
2803                          "desthost %s or default ccache. Using default "
2804                          "smb.conf realm %s\n",
2805                          remote_name,
2806                          realm));
2807         }
2808
2809         principal = talloc_asprintf(mem_ctx,
2810                                     "%s/%s@%s",
2811                                     service, remote_name,
2812                                     realm);
2813         TALLOC_FREE(realm);
2814         return principal;
2815 }
2816
2817 /**
2818  * @brief Get an error string from a Kerberos error code.
2819  *
2820  * @param[in]  context  The library context.
2821  *
2822  * @param[in]  code     The Kerberos error code.
2823  *
2824  * @param[in]  mem_ctx  The talloc context to allocate the error string on.
2825  *
2826  * @return A talloc'ed error string or NULL if an error occurred.
2827  *
2828  * The caller must free the returned error string with talloc_free() if not
2829  * needed anymore
2830  */
2831 char *smb_get_krb5_error_message(krb5_context context,
2832                                  krb5_error_code code,
2833                                  TALLOC_CTX *mem_ctx)
2834 {
2835         char *ret;
2836
2837 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2838         const char *context_error = krb5_get_error_message(context, code);
2839         if (context_error) {
2840                 ret = talloc_asprintf(mem_ctx, "%s: %s",
2841                                         error_message(code), context_error);
2842                 krb5_free_error_message(context, context_error);
2843                 return ret;
2844         }
2845 #endif
2846         ret = talloc_strdup(mem_ctx, error_message(code));
2847         return ret;
2848 }
2849
2850
2851 /**
2852  * @brief Return the kerberos library setting for: libdefaults:allow_weak_crypto
2853  *
2854  * @param[in]  context  The library context
2855  *
2856  * @return True if weak crypto is allowed, false if not.
2857  */
2858 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2859 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2860 {
2861         return krb5_config_get_bool_default(context,
2862                                             NULL,
2863                                             FALSE,
2864                                             "libdefaults",
2865                                             "allow_weak_crypto",
2866                                             NULL);
2867 }
2868 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2869 {
2870 #include <profile.h>
2871         krb5_error_code ret;
2872         krb5_boolean ret_default = false;
2873         profile_t profile;
2874         int ret_profile;
2875
2876         ret = krb5_get_profile(context,
2877                                &profile);
2878         if (ret) {
2879                 return ret_default;
2880         }
2881
2882         ret = profile_get_boolean(profile,
2883                                   "libdefaults",
2884                                   "allow_weak_crypto",
2885                                   NULL, /* subsubname */
2886                                   ret_default, /* def_val */
2887                                   &ret_profile /* *ret_default */);
2888         if (ret) {
2889                 return ret_default;
2890         }
2891
2892         profile_release(profile);
2893
2894         return ret_profile;
2895 }
2896 #else
2897 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2898 #endif
2899
2900 /**
2901  * @brief Return the type of a krb5_principal
2902  *
2903  * @param[in]  context  The library context.
2904  *
2905  * @param[in]  principal The principal to get the type from.
2906  *
2907  * @return The integer type of the principal.
2908  */
2909 int smb_krb5_principal_get_type(krb5_context context,
2910                                 krb5_const_principal principal)
2911 {
2912 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2913         return krb5_principal_get_type(context, principal);
2914 #elif defined(krb5_princ_type) /* MIT */
2915         return krb5_princ_type(context, principal);
2916 #else
2917 #error  UNKNOWN_PRINC_GET_TYPE_FUNCTION
2918 #endif
2919 }
2920
2921 /**
2922  * @brief Set the type of a principal
2923  *
2924  * @param[in]  context  The library context
2925  *
2926  * @param[inout] principal The principal to set the type for.
2927  *
2928  * @param[in]  type     The principal type to set.
2929  */
2930 void smb_krb5_principal_set_type(krb5_context context,
2931                                  krb5_principal principal,
2932                                  int type)
2933 {
2934 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
2935         krb5_principal_set_type(context, principal, type);
2936 #elif defined(krb5_princ_type) /* MIT */
2937         krb5_princ_type(context, principal) = type;
2938 #else
2939 #error  UNKNOWN_PRINC_SET_TYPE_FUNCTION
2940 #endif
2941 }
2942
2943 #if !defined(HAVE_KRB5_WARNX)
2944 /**
2945  * @brief Log a Kerberos message
2946  *
2947  * It sends the message to com_err.
2948  *
2949  * @param[in]  context  The library context
2950  *
2951  * @param[in]  fmt      The message format
2952  *
2953  * @param[in]  ...      The message arguments
2954  *
2955  * @return 0 on success.
2956  */
2957 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
2958 {
2959         va_list args;
2960
2961         va_start(args, fmt);
2962         com_err_va("samba-kdc", errno, fmt, args);
2963         va_end(args);
2964
2965         return 0;
2966 }
2967 #endif
2968
2969 /**
2970  * @brief Copy a credential cache.
2971  *
2972  * @param[in]  context  The library context.
2973  *
2974  * @param[in]  incc     Credential cache to be copied.
2975  *
2976  * @param[inout] outcc  Copy of credential cache to be filled in.
2977  *
2978  * @return 0 on success, a Kerberos error code otherwise.
2979  */
2980 krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
2981                                        krb5_ccache incc, krb5_ccache outcc)
2982 {
2983 #ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
2984         return krb5_cc_copy_cache(context, incc, outcc);
2985 #elif defined(HAVE_KRB5_CC_COPY_CREDS)
2986         krb5_error_code ret;
2987         krb5_principal princ = NULL;
2988
2989         ret = krb5_cc_get_principal(context, incc, &princ);
2990         if (ret != 0) {
2991                 return ret;
2992         }
2993         ret = krb5_cc_initialize(context, outcc, princ);
2994         krb5_free_principal(context, princ);
2995         if (ret != 0) {
2996                 return ret;
2997         }
2998         return krb5_cc_copy_creds(context, incc, outcc);
2999 #else
3000 #error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
3001 #endif
3002 }
3003
3004 /**********************************************************
3005  * ADS KRB5 CALLS
3006  **********************************************************/
3007
3008 static bool ads_cleanup_expired_creds(krb5_context context,
3009                                       krb5_ccache  ccache,
3010                                       krb5_creds  *credsp)
3011 {
3012         krb5_error_code retval;
3013         const char *cc_type = krb5_cc_get_type(context, ccache);
3014
3015         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
3016                   cc_type, krb5_cc_get_name(context, ccache),
3017                   http_timestring(talloc_tos(), credsp->times.endtime)));
3018
3019         /* we will probably need new tickets if the current ones
3020            will expire within 10 seconds.
3021         */
3022         if (credsp->times.endtime >= (time(NULL) + 10))
3023                 return false;
3024
3025         /* heimdal won't remove creds from a file ccache, and
3026            perhaps we shouldn't anyway, since internally we
3027            use memory ccaches, and a FILE one probably means that
3028            we're using creds obtained outside of our exectuable
3029         */
3030         if (strequal(cc_type, "FILE")) {
3031                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
3032                 return false;
3033         }
3034
3035         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
3036         if (retval) {
3037                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
3038                           error_message(retval)));
3039                 /* If we have an error in this, we want to display it,
3040                    but continue as though we deleted it */
3041         }
3042         return true;
3043 }
3044
3045 /* Allocate and setup the auth context into the state we need. */
3046
3047 static krb5_error_code ads_setup_auth_context(krb5_context context,
3048                                               krb5_auth_context *auth_context)
3049 {
3050         krb5_error_code retval;
3051
3052         retval = krb5_auth_con_init(context, auth_context );
3053         if (retval) {
3054                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
3055                         error_message(retval)));
3056                 return retval;
3057         }
3058
3059         /* Ensure this is an addressless ticket. */
3060         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
3061         if (retval) {
3062                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
3063                         error_message(retval)));
3064         }
3065
3066         return retval;
3067 }
3068
3069 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
3070 static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
3071                                                uint32_t gss_flags)
3072 {
3073         unsigned int orig_length = in_data->length;
3074         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
3075         char *gss_cksum = NULL;
3076
3077         if (orig_length) {
3078                 /* Extra length field for delgated ticket. */
3079                 base_cksum_size += 4;
3080         }
3081
3082         if ((unsigned int)base_cksum_size + orig_length <
3083                         (unsigned int)base_cksum_size) {
3084                 return EINVAL;
3085         }
3086
3087         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
3088         if (gss_cksum == NULL) {
3089                 return ENOMEM;
3090         }
3091
3092         memset(gss_cksum, '\0', base_cksum_size + orig_length);
3093         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
3094
3095         /*
3096          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
3097          * This matches the behavior of heimdal and mit.
3098          *
3099          * And it is needed to work against some closed source
3100          * SMB servers.
3101          *
3102          * See bug #7883
3103          */
3104         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
3105
3106         SIVAL(gss_cksum, 20, gss_flags);
3107
3108         if (orig_length) {
3109                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
3110                 SSVAL(gss_cksum, 26, orig_length);
3111                 /* Copy the kerberos KRB_CRED data */
3112                 memcpy(gss_cksum + 28, in_data->data, orig_length);
3113                 free(in_data->data);
3114                 in_data->data = NULL;
3115                 in_data->length = 0;
3116         }
3117         in_data->data = gss_cksum;
3118         in_data->length = base_cksum_size + orig_length;
3119         return 0;
3120 }
3121 #endif
3122
3123 /*
3124  * We can't use krb5_mk_req because w2k wants the service to be in a particular
3125  * format.
3126  */
3127 static krb5_error_code ads_krb5_mk_req(krb5_context context,
3128                                        krb5_auth_context *auth_context,
3129                                        const krb5_flags ap_req_options,
3130                                        const char *principal,
3131                                        krb5_ccache ccache,
3132                                        krb5_data *outbuf,
3133                                        time_t *expire_time,
3134                                        const char *impersonate_princ_s)
3135 {
3136         krb5_error_code retval;
3137         krb5_principal server;
3138         krb5_principal impersonate_princ = NULL;
3139         krb5_creds *credsp;
3140         krb5_creds creds;
3141         krb5_data in_data;
3142         bool creds_ready = false;
3143         int i = 0, maxtries = 3;
3144         bool ok;
3145
3146         ZERO_STRUCT(in_data);
3147
3148         retval = smb_krb5_parse_name(context, principal, &server);
3149         if (retval != 0) {
3150                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
3151                 return retval;
3152         }
3153
3154         if (impersonate_princ_s) {
3155                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
3156                                              &impersonate_princ);
3157                 if (retval) {
3158                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
3159                         goto cleanup_princ;
3160                 }
3161         }
3162
3163         /* obtain ticket & session key */
3164         ZERO_STRUCT(creds);
3165         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
3166                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
3167                          error_message(retval)));
3168                 goto cleanup_princ;
3169         }
3170
3171         retval = krb5_cc_get_principal(context, ccache, &creds.client);
3172         if (retval != 0) {
3173                 /* This can commonly fail on smbd startup with no ticket in the cache.
3174                  * Report at higher level than 1. */
3175                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
3176                          error_message(retval)));
3177                 goto cleanup_creds;
3178         }
3179
3180         while (!creds_ready && (i < maxtries)) {
3181
3182                 retval = smb_krb5_get_credentials(context,
3183                                                   ccache,
3184                                                   creds.client,
3185                                                   creds.server,
3186                                                   impersonate_princ,
3187                                                   &credsp);
3188                 if (retval != 0) {
3189                         DBG_WARNING("smb_krb5_get_credentials failed for %s "
3190                                     "(%s)\n",
3191                                     principal,
3192                                     error_message(retval));
3193                         goto cleanup_creds;
3194                 }
3195
3196                 /* cope with ticket being in the future due to clock skew */
3197                 if ((unsigned)credsp->times.starttime > time(NULL)) {
3198                         time_t t = time(NULL);
3199                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
3200                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
3201                         krb5_set_real_time(context, t + time_offset + 1, 0);
3202                 }
3203
3204                 ok = ads_cleanup_expired_creds(context, ccache, credsp);
3205                 if (!ok) {
3206                         creds_ready = true;
3207                 }
3208
3209                 i++;
3210         }
3211
3212         DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
3213                   principal,
3214                   krb5_cc_get_type(context, ccache),
3215                   krb5_cc_get_name(context, ccache),
3216                   http_timestring(talloc_tos(),
3217                                   (unsigned)credsp->times.endtime),
3218                   (unsigned)credsp->times.endtime);
3219
3220         if (expire_time) {
3221                 *expire_time = (time_t)credsp->times.endtime;
3222         }
3223
3224         /* Allocate the auth_context. */
3225         retval = ads_setup_auth_context(context, auth_context);
3226         if (retval != 0) {
3227                 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3228                             error_message(retval));
3229                 goto cleanup_creds;
3230         }
3231
3232 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
3233         {
3234                 uint32_t gss_flags = 0;
3235
3236                 if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
3237                         /*
3238                          * Fetch a forwarded TGT from the KDC so that we can
3239                          * hand off a 2nd ticket as part of the kerberos
3240                          * exchange.
3241                          */
3242
3243                         DBG_INFO("Server marked as OK to delegate to, building "
3244                                  "forwardable TGT\n");
3245
3246                         retval = krb5_auth_con_setuseruserkey(context,
3247                                         *auth_context,
3248                                         &credsp->keyblock );
3249                         if (retval != 0) {
3250                                 DBG_WARNING("krb5_auth_con_setuseruserkey "
3251                                             "failed (%s)\n",
3252                                             error_message(retval));
3253                                 goto cleanup_creds;
3254                         }
3255
3256                         /* Must use a subkey for forwarded tickets. */
3257                         retval = krb5_auth_con_setflags(context,
3258                                                         *auth_context,
3259                                                         KRB5_AUTH_CONTEXT_USE_SUBKEY);
3260                         if (retval != 0) {
3261                                 DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
3262                                             error_message(retval));
3263                                 goto cleanup_creds;
3264                         }
3265
3266                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
3267                                 *auth_context,  /* Authentication context [in] */
3268                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
3269                                 credsp->client, /* Client principal for the tgt [in] */
3270                                 credsp->server, /* Server principal for the tgt [in] */
3271                                 ccache,         /* Credential cache to use for storage [in] */
3272                                 1,              /* Turn on for "Forwardable ticket" [in] */
3273                                 &in_data );     /* Resulting response [out] */
3274
3275                         if (retval) {
3276                                 DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
3277                                          error_message(retval));
3278
3279                                 /*
3280                                  * This is not fatal. Delete the *auth_context and continue
3281                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
3282                                  */
3283
3284                                 if (in_data.data) {
3285                                         free( in_data.data );
3286                                         in_data.data = NULL;
3287                                         in_data.length = 0;
3288                                 }
3289                                 krb5_auth_con_free(context, *auth_context);
3290                                 *auth_context = NULL;
3291                                 retval = ads_setup_auth_context(context, auth_context);
3292                                 if (retval != 0) {
3293                                         DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3294                                                     error_message(retval));
3295                                         goto cleanup_creds;
3296                                 }
3297                         } else {
3298                                 /* We got a delegated ticket. */
3299                                 gss_flags |= GSS_C_DELEG_FLAG;
3300                         }
3301                 }
3302
3303                 /* Frees and reallocates in_data into a GSS checksum blob. */
3304                 retval = ads_create_gss_checksum(&in_data, gss_flags);
3305                 if (retval != 0) {
3306                         goto cleanup_data;
3307                 }
3308
3309                 /* We always want GSS-checksum types. */
3310                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
3311                 if (retval != 0) {
3312                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
3313                                 error_message(retval)));
3314                         goto cleanup_data;
3315                 }
3316         }
3317 #endif
3318
3319         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
3320                                       &in_data, credsp, outbuf);
3321         if (retval != 0) {
3322                 DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
3323                             error_message(retval));
3324         }
3325
3326 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
3327 cleanup_data:
3328 #endif
3329
3330         if (in_data.data) {
3331                 free( in_data.data );
3332                 in_data.length = 0;
3333         }
3334
3335         krb5_free_creds(context, credsp);
3336
3337 cleanup_creds:
3338         krb5_free_cred_contents(context, &creds);
3339
3340 cleanup_princ:
3341         krb5_free_principal(context, server);
3342         if (impersonate_princ) {
3343                 krb5_free_principal(context, impersonate_princ);
3344         }
3345
3346         return retval;
3347 }
3348
3349 /*
3350   get a kerberos5 ticket for the given service
3351 */
3352 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3353                             const char *principal,
3354                             time_t time_offset,
3355                             DATA_BLOB *ticket,
3356                             DATA_BLOB *session_key_krb5,
3357                             uint32_t extra_ap_opts, const char *ccname,
3358                             time_t *tgs_expire,
3359                             const char *impersonate_princ_s)
3360 {
3361         krb5_error_code retval;
3362         krb5_data packet;
3363         krb5_context context = NULL;
3364         krb5_ccache ccdef = NULL;
3365         krb5_auth_context auth_context = NULL;
3366         krb5_enctype enc_types[] = {
3367 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
3368                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
3369 #endif
3370 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
3371                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
3372 #endif
3373                 ENCTYPE_ARCFOUR_HMAC,
3374                 ENCTYPE_DES_CBC_MD5,
3375                 ENCTYPE_DES_CBC_CRC,
3376                 ENCTYPE_NULL};
3377         bool ok;
3378
3379         initialize_krb5_error_table();
3380         retval = krb5_init_context(&context);
3381         if (retval != 0) {
3382                 DBG_WARNING("krb5_init_context failed (%s)\n",
3383                             error_message(retval));
3384                 goto failed;
3385         }
3386
3387         if (time_offset != 0) {
3388                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
3389         }
3390
3391         retval = krb5_cc_resolve(context,
3392                                  ccname ? ccname : krb5_cc_default_name(context),
3393                                  &ccdef);
3394         if (retval != 0) {
3395                 DBG_WARNING("krb5_cc_default failed (%s)\n",
3396                             error_message(retval));
3397                 goto failed;
3398         }
3399
3400         retval = krb5_set_default_tgs_ktypes(context, enc_types);
3401         if (retval != 0) {
3402                 DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
3403                             error_message(retval));
3404                 goto failed;
3405         }
3406
3407         retval = ads_krb5_mk_req(context,
3408                                  &auth_context,
3409                                  AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
3410                                  principal,
3411                                  ccdef,
3412                                  &packet,
3413                                  tgs_expire,
3414                                  impersonate_princ_s);
3415         if (retval != 0) {
3416                 goto failed;
3417         }
3418
3419         ok = smb_krb5_get_smb_session_key(mem_ctx,
3420                                           context,
3421                                           auth_context,
3422                                           session_key_krb5,
3423                                           false);
3424         if (!ok) {
3425                 retval = ENOMEM;
3426                 goto failed;
3427         }
3428
3429         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
3430
3431         smb_krb5_free_data_contents(context, &packet);
3432
3433 failed:
3434
3435         if (context) {
3436                 if (ccdef) {
3437                         krb5_cc_close(context, ccdef);
3438                 }
3439                 if (auth_context) {
3440                         krb5_auth_con_free(context, auth_context);
3441                 }
3442                 krb5_free_context(context);
3443         }
3444
3445         return retval;
3446 }
3447
3448 #else /* HAVE_KRB5 */
3449 /* This saves a few linking headaches */
3450 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3451                             const char *principal,
3452                             time_t time_offset,
3453                             DATA_BLOB *ticket,
3454                             DATA_BLOB *session_key_krb5,
3455                             uint32_t extra_ap_opts, const char *ccname,
3456                             time_t *tgs_expire,
3457                             const char *impersonate_princ_s)
3458 {
3459          DEBUG(0,("NO KERBEROS SUPPORT\n"));
3460          return 1;
3461 }
3462
3463 #endif /* HAVE_KRB5 */