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/util/asn1.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
 117 /**********************************************************
 118  * WRAPPING FUNCTIONS
 119  **********************************************************/
 120
 121 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 122 /* HEIMDAL */
 123
 124 /**
 125  * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
 126  *
 127  * @param[in]  paddr    A pointer to a 'struct sockaddr_storage to extract the
 128  *                      address from.
 129  *
 130  * @param[out] pkaddr   A Kerberos address to store tha address in.
 131  *
 132  * @return True on success, false if an error occured.
 133  */
 134 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
 135                                 krb5_address *pkaddr)
 136 {
 137         memset(pkaddr, '\0', sizeof(krb5_address));
 138 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 139         if (paddr->ss_family == AF_INET6) {
 140                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 141                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 142                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 143                 return true;
 144         }
 145 #endif
 146         if (paddr->ss_family == AF_INET) {
 147                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 148                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 149                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 150                 return true;
 151         }
 152         return false;
 153 }
 154 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 155 /* MIT */
 156
 157 /**
 158  * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
 159  *
 160  * @param[in]  paddr    A pointer to a 'struct sockaddr_storage to extract the
 161  *                      address from.
 162  *
 163  * @param[in]  pkaddr A Kerberos address to store tha address in.
 164  *
 165  * @return True on success, false if an error occured.
 166  */
 167 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
 168                                 krb5_address *pkaddr)
 169 {
 170         memset(pkaddr, '\0', sizeof(krb5_address));
 171 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 172         if (paddr->ss_family == AF_INET6) {
 173                 pkaddr->addrtype = ADDRTYPE_INET6;
 174                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 175                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 176                 return true;
 177         }
 178 #endif
 179         if (paddr->ss_family == AF_INET) {
 180                 pkaddr->addrtype = ADDRTYPE_INET;
 181                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 182                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 183                 return true;
 184         }
 185         return false;
 186 }
 187 #else
 188 #error UNKNOWN_ADDRTYPE
 189 #endif
 190
 191 krb5_error_code smb_krb5_mk_error(krb5_context context,
 192                                   krb5_error_code error_code,
 193                                   const char *e_text,
 194                                   krb5_data *e_data,
 195                                   krb5_data *enc_err)
 196 {
 197         krb5_error_code code = EINVAL;
 198 #ifdef SAMBA4_USES_HEIMDAL
 199         code = krb5_mk_error(context,
 200                              error_code,
 201                              e_text,
 202                              e_data,
 203                              NULL, /* client */
 204                              NULL, /* server */
 205                              NULL, /* client_time */
 206                              NULL, /* client_usec */
 207                              enc_err);
 208 #else
 209         krb5_error dec_err = {
 210                 .error = error_code,
 211         };
 212
 213         if (e_text != NULL) {
 214                 dec_err.text.length = strlen(e_text);
 215                 dec_err.text.data = discard_const_p(char, e_text);
 216         }
 217         if (e_data != NULL) {
 218                 dec_err.e_data = *e_data;
 219         }
 220
 221         code = krb5_mk_error(context,
 222                              &dec_err,
 223                              enc_err);
 224 #endif
 225         return code;
 226 }
 227
 228 /**
 229 * @brief Create a keyblock based on input parameters
 230 *
 231 * @param context        The krb5_context
 232 * @param host_princ     The krb5_principal to use
 233 * @param salt           The optional salt, if omitted, salt is calculated with
 234 *                       the provided principal.
 235 * @param password       The krb5_data containing the password
 236 * @param enctype        The krb5_enctype to use for the keyblock generation
 237 * @param key            The returned krb5_keyblock, caller needs to free with
 238 *                       krb5_free_keyblock().
 239 *
 240 * @return krb5_error_code
 241 */
 242 int smb_krb5_create_key_from_string(krb5_context context,
 243                                     krb5_const_principal host_princ,
 244                                     krb5_data *salt,
 245                                     krb5_data *password,
 246                                     krb5_enctype enctype,
 247                                     krb5_keyblock *key)
 248 {
 249         int ret = 0;
 250
 251         if (host_princ == NULL && salt == NULL) {
 252                 return -1;
 253         }
 254
 255 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
 256 {/* MIT */
 257         krb5_data _salt;
 258
 259         if (salt == NULL) {
 260                 ret = krb5_principal2salt(context, host_princ, &_salt);
 261                 if (ret) {
 262                         DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 263                         return ret;
 264                 }
 265         } else {
 266                 _salt = *salt;
 267         }
 268         ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
 269         if (salt == NULL) {
 270                 SAFE_FREE(_salt.data);
 271         }
 272 }
 273 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 274 {/* Heimdal */
 275         krb5_salt _salt;
 276
 277         if (salt == NULL) {
 278                 ret = krb5_get_pw_salt(context, host_princ, &_salt);
 279                 if (ret) {
 280                         DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 281                         return ret;
 282                 }
 283         } else {
 284                 _salt.saltvalue = *salt;
 285                 _salt.salttype = KRB5_PW_SALT;
 286         }
 287
 288         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
 289         if (salt == NULL) {
 290                 krb5_free_salt(context, _salt);
 291         }
 292 }
 293 #else
 294 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 295 #endif
 296         return ret;
 297 }
 298
 299 /**
 300 * @brief Create a salt for a given principal
 301 *
 302 * @param context        The initialized krb5_context
 303 * @param host_princ     The krb5_principal to create the salt for
 304 * @param psalt          A pointer to a krb5_data struct
 305 *
 306 * caller has to free the contents of psalt with smb_krb5_free_data_contents
 307 * when function has succeeded
 308 *
 309 * @return krb5_error_code, returns 0 on success, error code otherwise
 310 */
 311
 312 int smb_krb5_get_pw_salt(krb5_context context,
 313                          krb5_const_principal host_princ,
 314                          krb5_data *psalt)
 315 #if defined(HAVE_KRB5_GET_PW_SALT)
 316 /* Heimdal */
 317 {
 318         int ret;
 319         krb5_salt salt;
 320
 321         ret = krb5_get_pw_salt(context, host_princ, &salt);
 322         if (ret) {
 323                 return ret;
 324         }
 325
 326         psalt->data = salt.saltvalue.data;
 327         psalt->length = salt.saltvalue.length;
 328
 329         return ret;
 330 }
 331 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
 332 /* MIT */
 333 {
 334         return krb5_principal2salt(context, host_princ, psalt);
 335 }
 336 #else
 337 #error UNKNOWN_SALT_FUNCTIONS
 338 #endif
 339
 340 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 341 /**
 342  * @brief Get a list of encryption types allowed for session keys
 343  *
 344  * @param[in]  context  The library context
 345  *
 346  * @param[in]  enctypes An allocated, zero-terminated list of encryption types
 347  *
 348  * This function returns an allocated list of encryption types allowed for
 349  * session keys.
 350  *
 351  * Use free() to free the enctypes when it is no longer needed.
 352  *
 353  * @retval 0 Success; otherwise - Kerberos error codes
 354  */
 355 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
 356                                             krb5_enctype **enctypes)
 357 {
 358         return krb5_get_permitted_enctypes(context, enctypes);
 359 }
 360 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 361 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
 362                                             krb5_enctype **enctypes)
 363 {
 364 #ifdef HAVE_KRB5_PDU_NONE_DECL
 365         return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
 366 #else
 367         return krb5_get_default_in_tkt_etypes(context, enctypes);
 368 #endif
 369 }
 370 #else
 371 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 372 #endif
 373
 374 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 375                            DATA_BLOB *edata,
 376                            DATA_BLOB *edata_out)
 377 {
 378         DATA_BLOB edata_contents;
 379         ASN1_DATA *data;
 380         int edata_type;
 381
 382         if (!edata->length) {
 383                 return false;
 384         }
 385
 386         data = asn1_init(mem_ctx);
 387         if (data == NULL) {
 388                 return false;
 389         }
 390
 391         if (!asn1_load(data, *edata)) goto err;
 392         if (!asn1_start_tag(data, ASN1_SEQUENCE(0))) goto err;
 393         if (!asn1_start_tag(data, ASN1_CONTEXT(1))) goto err;
 394         if (!asn1_read_Integer(data, &edata_type)) goto err;
 395
 396         if (edata_type != KRB5_PADATA_PW_SALT) {
 397                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 398                         KRB5_PADATA_PW_SALT, edata_type));
 399                 goto err;
 400         }
 401
 402         if (!asn1_start_tag(data, ASN1_CONTEXT(2))) goto err;
 403         if (!asn1_read_OctetString(data, talloc_tos(), &edata_contents)) goto err;
 404         if (!asn1_end_tag(data)) goto err;
 405         if (!asn1_end_tag(data)) goto err;
 406         if (!asn1_end_tag(data)) goto err;
 407         asn1_free(data);
 408
 409         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 410
 411         data_blob_free(&edata_contents);
 412
 413         return true;
 414
 415   err:
 416
 417         asn1_free(data);
 418         return false;
 419 }
 420
 421
 422 /**************************************************************
 423  krb5_parse_name that takes a UNIX charset.
 424 **************************************************************/
 425
 426 krb5_error_code smb_krb5_parse_name(krb5_context context,
 427                                 const char *name, /* in unix charset */
 428                                 krb5_principal *principal)
 429 {
 430         krb5_error_code ret;
 431         char *utf8_name;
 432         size_t converted_size;
 433         TALLOC_CTX *frame = talloc_stackframe();
 434
 435         if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
 436                 talloc_free(frame);
 437                 return ENOMEM;
 438         }
 439
 440         ret = krb5_parse_name(context, utf8_name, principal);
 441         TALLOC_FREE(frame);
 442         return ret;
 443 }
 444
 445 /**************************************************************
 446  krb5_parse_name that returns a UNIX charset name. Must
 447  be freed with talloc_free() call.
 448 **************************************************************/
 449
 450 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 451                                       krb5_context context,
 452                                       krb5_const_principal principal,
 453                                       char **unix_name)
 454 {
 455         krb5_error_code ret;
 456         char *utf8_name;
 457         size_t converted_size;
 458
 459         *unix_name = NULL;
 460         ret = krb5_unparse_name(context, principal, &utf8_name);
 461         if (ret) {
 462                 return ret;
 463         }
 464
 465         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 466                 krb5_free_unparsed_name(context, utf8_name);
 467                 return ENOMEM;
 468         }
 469         krb5_free_unparsed_name(context, utf8_name);
 470         return 0;
 471 }
 472
 473 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
 474                                             const char *name,
 475                                             krb5_principal *principal)
 476 {
 477         /* we are cheating here because parse_name will in fact set the realm.
 478          * We don't care as the only caller of smb_krb5_parse_name_norealm
 479          * ignores the realm anyway when calling
 480          * smb_krb5_principal_compare_any_realm later - Guenther */
 481
 482         return smb_krb5_parse_name(context, name, principal);
 483 }
 484
 485 bool smb_krb5_principal_compare_any_realm(krb5_context context,
 486                                           krb5_const_principal princ1,
 487                                           krb5_const_principal princ2)
 488 {
 489         return krb5_principal_compare_any_realm(context, princ1, princ2);
 490 }
 491
 492 /**
 493  * @brief Free the contents of a krb5_data structure and zero the data field.
 494  *
 495  * @param[in]  context  The krb5 context
 496  *
 497  * @param[in]  pdata    The data structure to free contents of
 498  *
 499  * This function frees the contents, not the structure itself.
 500  */
 501 void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata)
 502 {
 503 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 504         if (pdata->data) {
 505                 krb5_free_data_contents(context, pdata);
 506         }
 507 #elif defined(HAVE_KRB5_DATA_FREE)
 508         krb5_data_free(context, pdata);
 509 #else
 510         SAFE_FREE(pdata->data);
 511 #endif
 512 }
 513
 514 /*
 515  * @brief copy a buffer into a krb5_data struct
 516  *
 517  * @param[in] p                 The krb5_data
 518  * @param[in] data              The data to copy
 519  * @param[in] length            The length of the data to copy
 520  * @return krb5_error_code
 521  *
 522  * Caller has to free krb5_data with smb_krb5_free_data_contents().
 523  */
 524 krb5_error_code smb_krb5_copy_data_contents(krb5_data *p,
 525                                             const void *data,
 526                                             size_t len)
 527 {
 528 #if defined(HAVE_KRB5_DATA_COPY)
 529         return krb5_data_copy(p, data, len);
 530 #else
 531         if (len) {
 532                 p->data = malloc(len);
 533                 if (p->data == NULL) {
 534                         return ENOMEM;
 535                 }
 536                 memmove(p->data, data, len);
 537         } else {
 538                 p->data = NULL;
 539         }
 540         p->length = len;
 541         p->magic = KV5M_DATA;
 542         return 0;
 543 #endif
 544 }
 545
 546 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 547                               krb5_context context,
 548                               krb5_auth_context auth_context,
 549                               DATA_BLOB *session_key, bool remote)
 550 {
 551         krb5_keyblock *skey = NULL;
 552         krb5_error_code err = 0;
 553         bool ret = false;
 554
 555         if (remote) {
 556 #ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
 557                 err = krb5_auth_con_getrecvsubkey(context,
 558                                                   auth_context,
 559                                                   &skey);
 560 #else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
 561                 err = krb5_auth_con_getremotesubkey(context,
 562                                                     auth_context, &skey);
 563 #endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
 564         } else {
 565 #ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
 566                 err = krb5_auth_con_getsendsubkey(context,
 567                                                   auth_context,
 568                                                   &skey);
 569 #else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
 570                 err = krb5_auth_con_getlocalsubkey(context,
 571                                                    auth_context, &skey);
 572 #endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
 573         }
 574
 575         if (err || skey == NULL) {
 576                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 577                 goto done;
 578         }
 579
 580         DEBUG(10, ("Got KRB5 session key of length %d\n",
 581                    (int)KRB5_KEY_LENGTH(skey)));
 582
 583         *session_key = data_blob_talloc(mem_ctx,
 584                                          KRB5_KEY_DATA(skey),
 585                                          KRB5_KEY_LENGTH(skey));
 586         dump_data_pw("KRB5 Session Key:\n",
 587                      session_key->data,
 588                      session_key->length);
 589
 590         ret = true;
 591
 592 done:
 593         if (skey) {
 594                 krb5_free_keyblock(context, skey);
 595         }
 596
 597         return ret;
 598 }
 599
 600
 601 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 602  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 603
 604  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 605 {
 606         static krb5_data kdata;
 607
 608         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 609         kdata.length = strlen((const char *)kdata.data);
 610         return &kdata;
 611 }
 612 #endif
 613
 614 /*
 615  * @brief Get talloced string component of a principal
 616  *
 617  * @param[in] mem_ctx           The TALLOC_CTX
 618  * @param[in] context           The krb5_context
 619  * @param[in] principal         The principal
 620  * @param[in] component         The component
 621  * @return string component
 622  *
 623  * Caller must talloc_free if the return value is not NULL.
 624  *
 625  */
 626
 627 /* caller has to free returned string with talloc_free() */
 628 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
 629                                          krb5_context context,
 630                                          krb5_const_principal principal,
 631                                          unsigned int component)
 632 {
 633 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
 634         return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
 635 #else
 636         krb5_data *data;
 637
 638         if (component >= krb5_princ_size(context, principal)) {
 639                 return NULL;
 640         }
 641
 642         data = krb5_princ_component(context, principal, component);
 643         if (data == NULL) {
 644                 return NULL;
 645         }
 646
 647         return talloc_strndup(mem_ctx, data->data, data->length);
 648 #endif
 649 }
 650
 651 /* Prototypes */
 652
 653  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
 654                                        const char *client_string,       /* gd@BER.SUSE.DE */
 655                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
 656                                        time_t *expire_time)
 657 {
 658         krb5_error_code ret;
 659         krb5_context context = NULL;
 660         krb5_ccache ccache = NULL;
 661         krb5_principal client = NULL;
 662         krb5_creds creds, creds_in;
 663
 664         ZERO_STRUCT(creds);
 665         ZERO_STRUCT(creds_in);
 666
 667         initialize_krb5_error_table();
 668         ret = krb5_init_context(&context);
 669         if (ret) {
 670                 goto done;
 671         }
 672
 673         if (!ccache_string) {
 674                 ccache_string = krb5_cc_default_name(context);
 675         }
 676
 677         if (!ccache_string) {
 678                 ret = EINVAL;
 679                 goto done;
 680         }
 681
 682         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
 683
 684         /* FIXME: we should not fall back to defaults */
 685         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
 686         if (ret) {
 687                 goto done;
 688         }
 689
 690         if (client_string) {
 691                 ret = smb_krb5_parse_name(context, client_string, &client);
 692                 if (ret) {
 693                         goto done;
 694                 }
 695         } else {
 696                 ret = krb5_cc_get_principal(context, ccache, &client);
 697                 if (ret) {
 698                         goto done;
 699                 }
 700         }
 701
 702         ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
 703         if (ret) {
 704                 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
 705                 goto done;
 706         }
 707
 708         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
 709         ret = krb5_cc_initialize(context, ccache, client);
 710         if (ret) {
 711                 goto done;
 712         }
 713
 714         ret = krb5_cc_store_cred(context, ccache, &creds);
 715
 716         if (expire_time) {
 717                 *expire_time = (time_t) creds.times.endtime;
 718         }
 719
 720 done:
 721         krb5_free_cred_contents(context, &creds_in);
 722         krb5_free_cred_contents(context, &creds);
 723
 724         if (client) {
 725                 krb5_free_principal(context, client);
 726         }
 727         if (ccache) {
 728                 krb5_cc_close(context, ccache);
 729         }
 730         if (context) {
 731                 krb5_free_context(context);
 732         }
 733
 734         return ret;
 735 }
 736
 737  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
 738 {
 739         krb5_error_code ret = 0;
 740         if (addr == NULL) {
 741                 return ret;
 742         }
 743 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 744         krb5_free_addresses(context, addr->addrs);
 745 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 746         ret = krb5_free_addresses(context, addr->addrs);
 747         SAFE_FREE(addr->addrs);
 748 #endif
 749         SAFE_FREE(addr);
 750         addr = NULL;
 751         return ret;
 752 }
 753
 754 #define MAX_NETBIOSNAME_LEN 16
 755  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
 756                                                    const char *netbios_name)
 757 {
 758         krb5_error_code ret = 0;
 759         char buf[MAX_NETBIOSNAME_LEN];
 760         int len;
 761 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 762         krb5_address **addrs = NULL;
 763 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 764         krb5_addresses *addrs = NULL;
 765 #endif
 766
 767         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
 768         if (*kerb_addr == NULL) {
 769                 return ENOMEM;
 770         }
 771
 772         /* temporarily duplicate put_name() code here to avoid dependency
 773          * issues for a 5 lines function */
 774         len = strlen(netbios_name);
 775         memcpy(buf, netbios_name,
 776                 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
 777         if (len < MAX_NETBIOSNAME_LEN - 1) {
 778                 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
 779         }
 780         buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
 781
 782 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 783         {
 784                 int num_addr = 2;
 785
 786                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
 787                 if (addrs == NULL) {
 788                         SAFE_FREE(*kerb_addr);
 789                         return ENOMEM;
 790                 }
 791
 792                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
 793
 794                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
 795                 if (addrs[0] == NULL) {
 796                         SAFE_FREE(addrs);
 797                         SAFE_FREE(*kerb_addr);
 798                         return ENOMEM;
 799                 }
 800
 801                 addrs[0]->magic = KV5M_ADDRESS;
 802                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
 803                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
 804                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
 805                 if (addrs[0]->contents == NULL) {
 806                         SAFE_FREE(addrs[0]);
 807                         SAFE_FREE(addrs);
 808                         SAFE_FREE(*kerb_addr);
 809                         return ENOMEM;
 810                 }
 811
 812                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
 813
 814                 addrs[1] = NULL;
 815         }
 816 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 817         {
 818                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
 819                 if (addrs == NULL) {
 820                         SAFE_FREE(*kerb_addr);
 821                         return ENOMEM;
 822                 }
 823
 824                 memset(addrs, 0, sizeof(krb5_addresses));
 825
 826                 addrs->len = 1;
 827                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
 828                 if (addrs->val == NULL) {
 829                         SAFE_FREE(addrs);
 830                         SAFE_FREE(kerb_addr);
 831                         return ENOMEM;
 832                 }
 833
 834                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
 835                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
 836                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
 837                 if (addrs->val[0].address.data == NULL) {
 838                         SAFE_FREE(addrs->val);
 839                         SAFE_FREE(addrs);
 840                         SAFE_FREE(*kerb_addr);
 841                         return ENOMEM;
 842                 }
 843
 844                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
 845         }
 846 #else
 847 #error UNKNOWN_KRB5_ADDRESS_FORMAT
 848 #endif
 849         (*kerb_addr)->addrs = addrs;
 850
 851         return ret;
 852 }
 853
 854  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
 855 {
 856 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
 857         krb5_free_error_contents(context, krberror);
 858 #else /* MIT */
 859         krb5_free_error(context, krberror);
 860 #endif
 861 }
 862
 863  krb5_error_code handle_krberror_packet(krb5_context context,
 864                                         krb5_data *packet)
 865 {
 866         krb5_error_code ret;
 867         bool got_error_code = false;
 868
 869         DEBUG(10,("handle_krberror_packet: got error packet\n"));
 870
 871 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
 872         {
 873                 krb5_error krberror;
 874
 875                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
 876                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
 877                                 error_message(ret)));
 878                         return ret;
 879                 }
 880
 881                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
 882                         ret = (krb5_error_code) krberror.error_code;
 883                         got_error_code = true;
 884                 }
 885
 886                 smb_krb5_free_error(context, &krberror);
 887         }
 888 #else /* MIT */
 889         {
 890                 krb5_error *krberror;
 891
 892                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
 893                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
 894                                 error_message(ret)));
 895                         return ret;
 896                 }
 897
 898                 if (krberror->e_data.data == NULL) {
 899 #if defined(ERROR_TABLE_BASE_krb5)
 900                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
 901 #else
 902                         ret = (krb5_error_code)krberror->error;
 903 #endif
 904                         got_error_code = true;
 905                 }
 906                 smb_krb5_free_error(context, krberror);
 907         }
 908 #endif
 909         if (got_error_code) {
 910                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
 911                         error_message(ret), ret));
 912         }
 913         return ret;
 914 }
 915
 916 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
 917                                             krb5_get_init_creds_opt **opt)
 918 {
 919         /* Heimdal or modern MIT version */
 920         return krb5_get_init_creds_opt_alloc(context, opt);
 921 }
 922
 923 void smb_krb5_get_init_creds_opt_free(krb5_context context,
 924                                 krb5_get_init_creds_opt *opt)
 925 {
 926         /* Modern MIT or Heimdal version */
 927         krb5_get_init_creds_opt_free(context, opt);
 928 }
 929
 930 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
 931 {
 932         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
 933 }
 934
 935 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
 936                                         krb5_keytab_entry *kt_entry)
 937 {
 938 /* Try krb5_free_keytab_entry_contents first, since
 939  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 940  * krb5_kt_free_entry but only has a prototype for the first, while the
 941  * second is considered private.
 942  */
 943 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 944         return krb5_free_keytab_entry_contents(context, kt_entry);
 945 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
 946         return krb5_kt_free_entry(context, kt_entry);
 947 #else
 948 #error UNKNOWN_KT_FREE_FUNCTION
 949 #endif
 950 }
 951
 952
 953 /* caller needs to free etype_s */
 954 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
 955                                            krb5_enctype enctype,
 956                                            char **etype_s)
 957 {
 958 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
 959         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
 960 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
 961         char buf[256];
 962         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
 963         if (ret) {
 964                 return ret;
 965         }
 966         *etype_s = SMB_STRDUP(buf);
 967         if (!*etype_s) {
 968                 return ENOMEM;
 969         }
 970         return ret;
 971 #else
 972 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
 973 #endif
 974 }
 975
 976 /**********************************************************************
 977  * Open a krb5 keytab with flags, handles readonly or readwrite access and
 978  * allows one to process non-default keytab names.
 979  * @param context krb5_context
 980  * @param keytab_name_req string
 981  * @param write_access bool if writable keytab is required
 982  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
 983  * @return krb5_error_code
 984 **********************************************************************/
 985
 986 /* This MAX_NAME_LEN is a constant defined in krb5.h */
 987 #ifndef MAX_KEYTAB_NAME_LEN
 988 #define MAX_KEYTAB_NAME_LEN 1100
 989 #endif
 990
 991 krb5_error_code smb_krb5_open_keytab_relative(krb5_context context,
 992                                               const char *keytab_name_req,
 993                                               bool write_access,
 994                                               krb5_keytab *keytab)
 995 {
 996         krb5_error_code ret = 0;
 997         TALLOC_CTX *mem_ctx;
 998         char keytab_string[MAX_KEYTAB_NAME_LEN];
 999         char *kt_str = NULL;
1000         bool found_valid_name = false;
1001         const char *pragma = "FILE";
1002         const char *tmp = NULL;
1003
1004         if (!write_access && !keytab_name_req) {
1005                 /* caller just wants to read the default keytab readonly, so be it */
1006                 return krb5_kt_default(context, keytab);
1007         }
1008
1009         mem_ctx = talloc_init("smb_krb5_open_keytab");
1010         if (!mem_ctx) {
1011                 return ENOMEM;
1012         }
1013
1014 #ifdef HAVE_WRFILE_KEYTAB
1015         if (write_access) {
1016                 pragma = "WRFILE";
1017         }
1018 #endif
1019
1020         if (keytab_name_req) {
1021
1022                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1023                         ret = KRB5_CONFIG_NOTENUFSPACE;
1024                         goto out;
1025                 }
1026
1027                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1028                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1029                         tmp = keytab_name_req;
1030                         goto resolve;
1031                 }
1032
1033                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1034                 if (!tmp) {
1035                         ret = ENOMEM;
1036                         goto out;
1037                 }
1038
1039                 goto resolve;
1040         }
1041
1042         /* we need to handle more complex keytab_strings, like:
1043          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1044
1045         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1046         if (ret) {
1047                 goto out;
1048         }
1049
1050         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1051
1052         tmp = talloc_strdup(mem_ctx, keytab_string);
1053         if (!tmp) {
1054                 ret = ENOMEM;
1055                 goto out;
1056         }
1057
1058         if (strncmp(tmp, "ANY:", 4) == 0) {
1059                 tmp += 4;
1060         }
1061
1062         memset(&keytab_string, '\0', sizeof(keytab_string));
1063
1064         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1065                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1066                         found_valid_name = true;
1067                         tmp = kt_str;
1068                         tmp += 7;
1069                 }
1070
1071                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1072                         found_valid_name = true;
1073                         tmp = kt_str;
1074                         tmp += 5;
1075                 }
1076
1077                 if (tmp[0] == '/') {
1078                         /* Treat as a FILE: keytab definition. */
1079                         found_valid_name = true;
1080                 }
1081
1082                 if (found_valid_name) {
1083                         if (tmp[0] != '/') {
1084                                 ret = KRB5_KT_BADNAME;
1085                                 goto out;
1086                         }
1087
1088                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1089                         if (!tmp) {
1090                                 ret = ENOMEM;
1091                                 goto out;
1092                         }
1093                         break;
1094                 }
1095         }
1096
1097         if (!found_valid_name) {
1098                 ret = KRB5_KT_UNKNOWN_TYPE;
1099                 goto out;
1100         }
1101
1102  resolve:
1103         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1104         ret = krb5_kt_resolve(context, tmp, keytab);
1105
1106  out:
1107         TALLOC_FREE(mem_ctx);
1108         return ret;
1109 }
1110
1111 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1112                                      const char *keytab_name_req,
1113                                      bool write_access,
1114                                      krb5_keytab *keytab)
1115 {
1116         if (keytab_name_req != NULL) {
1117                 if (keytab_name_req[0] != '/') {
1118                         return KRB5_KT_BADNAME;
1119                 }
1120         }
1121
1122         return smb_krb5_open_keytab_relative(context,
1123                                              keytab_name_req,
1124                                              write_access,
1125                                              keytab);
1126 }
1127
1128 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1129                                      krb5_context context,
1130                                      krb5_keytab keytab,
1131                                      const char **keytab_name)
1132 {
1133         char keytab_string[MAX_KEYTAB_NAME_LEN];
1134         krb5_error_code ret = 0;
1135
1136         ret = krb5_kt_get_name(context, keytab,
1137                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1138         if (ret) {
1139                 return ret;
1140         }
1141
1142         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1143         if (!*keytab_name) {
1144                 return ENOMEM;
1145         }
1146
1147         return ret;
1148 }
1149
1150 /**
1151  * @brief Seek and delete old entries in a keytab based on the passed
1152  *        principal.
1153  *
1154  * @param[in]  context       The KRB5 context to use.
1155  *
1156  * @param[in]  keytab        The keytab to operate on.
1157  *
1158  * @param[in]  kvno          The kvnco to use.
1159  *
1160  * @param[in]  princ_s       The principal as a string to search for.
1161  *
1162  * @param[in]  princ         The principal as a krb5_principal to search for.
1163  *
1164  * @param[in]  flush         Weather to flush the complete keytab.
1165  *
1166  * @param[in]  keep_old_entries Keep the entry with the previous kvno.
1167  *
1168  * @retval 0 on Sucess
1169  *
1170  * @return An appropriate KRB5 error code.
1171  */
1172 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1173                                                         krb5_keytab keytab,
1174                                                         krb5_kvno kvno,
1175                                                         krb5_enctype enctype,
1176                                                         const char *princ_s,
1177                                                         krb5_principal princ,
1178                                                         bool flush,
1179                                                         bool keep_old_entries)
1180 {
1181         krb5_error_code ret;
1182         krb5_kt_cursor cursor;
1183         krb5_kt_cursor zero_csr;
1184         krb5_keytab_entry kt_entry;
1185         krb5_keytab_entry zero_kt_entry;
1186         char *ktprinc = NULL;
1187         krb5_kvno old_kvno = kvno - 1;
1188         TALLOC_CTX *tmp_ctx;
1189
1190         ZERO_STRUCT(cursor);
1191         ZERO_STRUCT(zero_csr);
1192         ZERO_STRUCT(kt_entry);
1193         ZERO_STRUCT(zero_kt_entry);
1194
1195         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1196         if (ret == KRB5_KT_END || ret == ENOENT ) {
1197                 /* no entries */
1198                 return 0;
1199         }
1200
1201         tmp_ctx = talloc_new(NULL);
1202         if (tmp_ctx == NULL) {
1203                 return ENOMEM;
1204         }
1205
1206         DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1207         while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1208                 bool name_ok = false;
1209                 krb5_enctype kt_entry_enctype =
1210                         smb_get_enctype_from_kt_entry(&kt_entry);
1211
1212                 if (!flush && (princ_s != NULL)) {
1213                         ret = smb_krb5_unparse_name(tmp_ctx, context,
1214                                                     kt_entry.principal,
1215                                                     &ktprinc);
1216                         if (ret) {
1217                                 DEBUG(1, (__location__
1218                                           ": smb_krb5_unparse_name failed "
1219                                           "(%s)\n", error_message(ret)));
1220                                 goto out;
1221                         }
1222
1223 #ifdef HAVE_KRB5_KT_COMPARE
1224                         name_ok = krb5_kt_compare(context, &kt_entry,
1225                                                   princ, 0, 0);
1226 #else
1227                         name_ok = (strcmp(ktprinc, princ_s) == 0);
1228 #endif
1229
1230                         if (!name_ok) {
1231                                 DEBUG(10, (__location__ ": ignoring keytab "
1232                                            "entry principal %s, kvno = %d\n",
1233                                            ktprinc, kt_entry.vno));
1234
1235                                 /* Not a match,
1236                                  * just free this entry and continue. */
1237                                 ret = smb_krb5_kt_free_entry(context,
1238                                                              &kt_entry);
1239                                 ZERO_STRUCT(kt_entry);
1240                                 if (ret) {
1241                                         DEBUG(1, (__location__
1242                                                   ": smb_krb5_kt_free_entry "
1243                                                   "failed (%s)\n",
1244                                                   error_message(ret)));
1245                                         goto out;
1246                                 }
1247
1248                                 TALLOC_FREE(ktprinc);
1249                                 continue;
1250                         }
1251
1252                         TALLOC_FREE(ktprinc);
1253                 }
1254
1255                 /*------------------------------------------------------------
1256                  * Save the entries with kvno - 1. This is what microsoft does
1257                  * to allow people with existing sessions that have kvno - 1
1258                  * to still work. Otherwise, when the password for the machine
1259                  * changes, all kerberizied sessions will 'break' until either
1260                  * the client reboots or the client's session key expires and
1261                  * they get a new session ticket with the new kvno.
1262                  * Some keytab files only store the kvno in 8bits, limit
1263                  * the compare accordingly.
1264                  */
1265
1266                 if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1267                         DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1268                                   "entry for principal: %s.\n",
1269                                   old_kvno, princ_s));
1270                         continue;
1271                 }
1272
1273                 if (keep_old_entries) {
1274                         DEBUG(5, (__location__ ": Saving old (kvno %d) "
1275                                   "entry for principal: %s.\n",
1276                                   kvno, princ_s));
1277                         continue;
1278                 }
1279
1280                 if (!flush &&
1281                     (kt_entry.vno == kvno) &&
1282                     (kt_entry_enctype != enctype))
1283                 {
1284                         DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
1285                                   "enctype [%d] for principal: %s.\n",
1286                                   kvno, kt_entry_enctype, princ_s));
1287                         continue;
1288                 }
1289
1290                 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1291                           "(kvno %d) - trying to remove it.\n",
1292                           princ_s, kt_entry.vno));
1293
1294                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1295                 ZERO_STRUCT(cursor);
1296                 if (ret) {
1297                         DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1298                                   "failed (%s)\n", error_message(ret)));
1299                         goto out;
1300                 }
1301                 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1302                 if (ret) {
1303                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1304                                   "failed (%s)\n", error_message(ret)));
1305                         goto out;
1306                 }
1307
1308                 DEBUG(5, (__location__ ": removed old entry for principal: "
1309                           "%s (kvno %d).\n", princ_s, kt_entry.vno));
1310
1311                 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1312                 if (ret) {
1313                         DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1314                                   "(%s)\n", error_message(ret)));
1315                         goto out;
1316                 }
1317                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1318                 ZERO_STRUCT(kt_entry);
1319                 if (ret) {
1320                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1321                                   "failed (%s)\n", error_message(ret)));
1322                         goto out;
1323                 }
1324         }
1325
1326 out:
1327         talloc_free(tmp_ctx);
1328         if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
1329                 smb_krb5_kt_free_entry(context, &kt_entry);
1330         }
1331         if (memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) {
1332                 krb5_kt_end_seq_get(context, keytab, &cursor);
1333         }
1334         return ret;
1335 }
1336
1337 /**
1338  * @brief Add a keytab entry for the given principal
1339  *
1340  * @param[in]  context       The krb5 context to use.
1341  *
1342  * @param[in]  keytab        The keytab to add the entry to.
1343  *
1344  * @param[in]  kvno          The kvno to use.
1345  *
1346  * @param[in]  princ_s       The principal as a string.
1347  *
1348  * @param[in]  salt_principal The salt principal to salt the password with.
1349  *                            Only needed for keys which support salting.
1350  *                            If no salt is used set no_salt to false and
1351  *                            pass NULL here.
1352  *
1353  * @param[in]  enctype        The encryption type of the keytab entry.
1354  *
1355  * @param[in]  password       The password of the keytab entry.
1356  *
1357  * @param[in]  no_salt        If the password should not be salted. Normally
1358  *                            this is only set to false for encryption types
1359  *                            which do not support salting like RC4.
1360  *
1361  * @param[in]  keep_old_entries Wether to keep or delte old keytab entries.
1362  *
1363  * @retval 0 on Success
1364  *
1365  * @return A corresponding KRB5 error code.
1366  *
1367  * @see smb_krb5_open_keytab()
1368  */
1369 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1370                                       krb5_keytab keytab,
1371                                       krb5_kvno kvno,
1372                                       const char *princ_s,
1373                                       const char *salt_principal,
1374                                       krb5_enctype enctype,
1375                                       krb5_data *password,
1376                                       bool no_salt,
1377                                       bool keep_old_entries)
1378 {
1379         krb5_error_code ret;
1380         krb5_keytab_entry kt_entry;
1381         krb5_principal princ = NULL;
1382         krb5_keyblock *keyp;
1383
1384         ZERO_STRUCT(kt_entry);
1385
1386         ret = smb_krb5_parse_name(context, princ_s, &princ);
1387         if (ret) {
1388                 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1389                           "failed (%s)\n", princ_s, error_message(ret)));
1390                 goto out;
1391         }
1392
1393         /* Seek and delete old keytab entries */
1394         ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1395                                                       keytab,
1396                                                       kvno,
1397                                                       enctype,
1398                                                       princ_s,
1399                                                       princ,
1400                                                       false,
1401                                                       keep_old_entries);
1402         if (ret) {
1403                 goto out;
1404         }
1405
1406         /* If we get here, we have deleted all the old entries with kvno's
1407          * not equal to the current kvno-1. */
1408
1409         keyp = KRB5_KT_KEY(&kt_entry);
1410
1411         if (no_salt) {
1412                 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1413                 if (KRB5_KEY_DATA(keyp) == NULL) {
1414                         ret = ENOMEM;
1415                         goto out;
1416                 }
1417                 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1418                 KRB5_KEY_LENGTH(keyp) = password->length;
1419                 KRB5_KEY_TYPE(keyp) = enctype;
1420         } else {
1421                 krb5_principal salt_princ = NULL;
1422
1423                 /* Now add keytab entries for all encryption types */
1424                 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1425                 if (ret) {
1426                         DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1427                                     salt_principal, error_message(ret));
1428                         goto out;
1429                 }
1430
1431                 ret = smb_krb5_create_key_from_string(context,
1432                                                       salt_princ,
1433                                                       NULL,
1434                                                       password,
1435                                                       enctype,
1436                                                       keyp);
1437                 krb5_free_principal(context, salt_princ);
1438                 if (ret != 0) {
1439                         goto out;
1440                 }
1441         }
1442
1443         kt_entry.principal = princ;
1444         kt_entry.vno       = kvno;
1445
1446         DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1447                   "encryption type (%d) and version (%d)\n",
1448                   princ_s, enctype, kt_entry.vno));
1449         ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1450         krb5_free_keyblock_contents(context, keyp);
1451         ZERO_STRUCT(kt_entry);
1452         if (ret) {
1453                 DEBUG(1, (__location__ ": adding entry to keytab "
1454                           "failed (%s)\n", error_message(ret)));
1455                 goto out;
1456         }
1457
1458 out:
1459         if (princ) {
1460                 krb5_free_principal(context, princ);
1461         }
1462
1463         return ret;
1464 }
1465
1466 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1467     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1468     defined(HAVE_KRB5_GET_CREDS)
1469 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1470                                                              krb5_ccache ccache,
1471                                                              krb5_principal me,
1472                                                              krb5_principal server,
1473                                                              krb5_principal impersonate_princ,
1474                                                              krb5_creds **out_creds)
1475 {
1476         krb5_error_code ret;
1477         krb5_get_creds_opt opt;
1478
1479         ret = krb5_get_creds_opt_alloc(context, &opt);
1480         if (ret) {
1481                 goto done;
1482         }
1483         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1484
1485         if (impersonate_princ) {
1486                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1487                                                          impersonate_princ);
1488                 if (ret) {
1489                         goto done;
1490                 }
1491         }
1492
1493         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1494         if (ret) {
1495                 goto done;
1496         }
1497
1498  done:
1499         if (opt) {
1500                 krb5_get_creds_opt_free(context, opt);
1501         }
1502         return ret;
1503 }
1504 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1505
1506 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1507
1508 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1509 krb5_error_code KRB5_CALLCONV
1510 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1511                               krb5_ccache ccache, krb5_creds *in_creds,
1512                               krb5_data *subject_cert,
1513                               krb5_creds **out_creds);
1514 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1515
1516 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1517                                                          krb5_ccache ccache,
1518                                                          krb5_principal me,
1519                                                          krb5_principal server,
1520                                                          krb5_principal impersonate_princ,
1521                                                          krb5_creds **out_creds)
1522 {
1523         krb5_error_code ret;
1524         krb5_creds in_creds;
1525
1526         ZERO_STRUCT(in_creds);
1527
1528         if (impersonate_princ) {
1529
1530                 in_creds.server = me;
1531                 in_creds.client = impersonate_princ;
1532
1533                 ret = krb5_get_credentials_for_user(context,
1534                                                     0, /* krb5_flags options */
1535                                                     ccache,
1536                                                     &in_creds,
1537                                                     NULL, /* krb5_data *subject_cert */
1538                                                     out_creds);
1539         } else {
1540                 in_creds.client = me;
1541                 in_creds.server = server;
1542
1543                 ret = krb5_get_credentials(context, 0, ccache,
1544                                            &in_creds, out_creds);
1545         }
1546
1547         return ret;
1548 }
1549 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1550
1551 /*
1552  * smb_krb5_get_credentials
1553  *
1554  * @brief Get krb5 credentials for a server
1555  *
1556  * @param[in] context           An initialized krb5_context
1557  * @param[in] ccache            An initialized krb5_ccache
1558  * @param[in] me                The krb5_principal of the caller
1559  * @param[in] server            The krb5_principal of the requested service
1560  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1561  * @param[out] out_creds        The returned krb5_creds structure
1562  * @return krb5_error_code
1563  *
1564  */
1565 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1566                                          krb5_ccache ccache,
1567                                          krb5_principal me,
1568                                          krb5_principal server,
1569                                          krb5_principal impersonate_princ,
1570                                          krb5_creds **out_creds)
1571 {
1572         krb5_error_code ret;
1573         krb5_creds *creds = NULL;
1574
1575         if (out_creds != NULL) {
1576                 *out_creds = NULL;
1577         }
1578
1579         if (impersonate_princ) {
1580 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1581                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1582 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1583                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1584 #else
1585                 ret = ENOTSUP;
1586 #endif
1587         } else {
1588                 krb5_creds in_creds;
1589
1590                 ZERO_STRUCT(in_creds);
1591
1592                 in_creds.client = me;
1593                 in_creds.server = server;
1594
1595                 ret = krb5_get_credentials(context, 0, ccache,
1596                                            &in_creds, &creds);
1597         }
1598         if (ret) {
1599                 goto done;
1600         }
1601
1602         if (out_creds) {
1603                 *out_creds = creds;
1604         }
1605
1606  done:
1607         if (creds && ret) {
1608                 krb5_free_creds(context, creds);
1609         }
1610
1611         return ret;
1612 }
1613
1614 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1615                                                 krb5_enctype enctype,
1616                                                 const void *data,
1617                                                 size_t length,
1618                                                 krb5_keyblock *key)
1619 {
1620 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1621         return krb5_keyblock_init(context, enctype, data, length, key);
1622 #else
1623         memset(key, 0, sizeof(krb5_keyblock));
1624         KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1625         if (NULL == KRB5_KEY_DATA(key)) {
1626                 return ENOMEM;
1627         }
1628         memcpy(KRB5_KEY_DATA(key), data, length);
1629         KRB5_KEY_LENGTH(key) = length;
1630         KRB5_KEY_TYPE(key) = enctype;
1631         return 0;
1632 #endif
1633 }
1634
1635 /*
1636   simulate a kinit, putting the tgt in the given credentials cache.
1637   Orignally by remus@snapserver.com
1638
1639   This version is built to use a keyblock, rather than needing the
1640   original password.
1641
1642   The impersonate_principal is the principal if NULL, or the principal
1643   to impersonate
1644
1645   The target_service defaults to the krbtgt if NULL, but could be
1646    kpasswd/realm or the local service (if we are doing s4u2self)
1647 */
1648 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1649                                            krb5_principal principal,
1650                                            krb5_keyblock *keyblock,
1651                                            const char *target_service,
1652                                            krb5_get_init_creds_opt *krb_options,
1653                                            time_t *expire_time,
1654                                            time_t *kdc_time)
1655 {
1656         krb5_error_code code = 0;
1657         krb5_creds my_creds;
1658
1659 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1660         code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1661                                             keyblock, 0, target_service,
1662                                             krb_options);
1663 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1664 {
1665 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1666         char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1667         krb5_keytab_entry entry;
1668         krb5_keytab keytab;
1669         mode_t mask;
1670
1671         memset(&entry, 0, sizeof(entry));
1672         entry.principal = principal;
1673         *(KRB5_KT_KEY(&entry)) = *keyblock;
1674
1675         memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1676         mask = umask(S_IRWXO | S_IRWXG);
1677         mktemp(tmp_name);
1678         umask(mask);
1679         if (tmp_name[0] == 0) {
1680                 return KRB5_KT_BADNAME;
1681         }
1682         code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1683         if (code) {
1684                 return code;
1685         }
1686
1687         code = krb5_kt_add_entry(ctx, keytab, &entry);
1688         if (code) {
1689                 (void)krb5_kt_close(ctx, keytab);
1690                 goto done;
1691         }
1692
1693         code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1694                                           keytab, 0, target_service,
1695                                           krb_options);
1696         (void)krb5_kt_close(ctx, keytab);
1697 }
1698 #else
1699 #error krb5_get_init_creds_keyblock not available!
1700 #endif
1701         if (code) {
1702                 return code;
1703         }
1704
1705 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1706         /*
1707          * We need to store the principal as returned from the KDC to the
1708          * credentials cache. If we don't do that the KRB5 library is not
1709          * able to find the tickets it is looking for
1710          */
1711         principal = my_creds.client;
1712 #endif
1713         code = krb5_cc_initialize(ctx, cc, principal);
1714         if (code) {
1715                 goto done;
1716         }
1717
1718         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1719         if (code) {
1720                 goto done;
1721         }
1722
1723         if (expire_time) {
1724                 *expire_time = (time_t) my_creds.times.endtime;
1725         }
1726
1727         if (kdc_time) {
1728                 *kdc_time = (time_t) my_creds.times.starttime;
1729         }
1730
1731         code = 0;
1732 done:
1733         krb5_free_cred_contents(ctx, &my_creds);
1734         return code;
1735 }
1736
1737 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
1738                                            krb5_principal principal,
1739                                            const char *password,
1740                                            const char *target_service,
1741                                            krb5_get_init_creds_opt *krb_options,
1742                                            time_t *expire_time,
1743                                            time_t *kdc_time)
1744 {
1745         krb5_error_code code = 0;
1746         krb5_creds my_creds;
1747
1748         code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1749                                             password, NULL, NULL, 0,
1750                                             target_service, krb_options);
1751         if (code) {
1752                 return code;
1753         }
1754
1755 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1756         /*
1757          * We need to store the principal as returned from the KDC to the
1758          * credentials cache. If we don't do that the KRB5 library is not
1759          * able to find the tickets it is looking for
1760          */
1761         principal = my_creds.client;
1762 #endif
1763         code = krb5_cc_initialize(ctx, cc, principal);
1764         if (code) {
1765                 goto done;
1766         }
1767
1768         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1769         if (code) {
1770                 goto done;
1771         }
1772
1773         if (expire_time) {
1774                 *expire_time = (time_t) my_creds.times.endtime;
1775         }
1776
1777         if (kdc_time) {
1778                 *kdc_time = (time_t) my_creds.times.starttime;
1779         }
1780
1781         code = 0;
1782 done:
1783         krb5_free_cred_contents(ctx, &my_creds);
1784         return code;
1785 }
1786
1787 #ifdef SAMBA4_USES_HEIMDAL
1788 /*
1789   simulate a kinit, putting the tgt in the given credentials cache.
1790   Orignally by remus@snapserver.com
1791
1792   The impersonate_principal is the principal
1793
1794   The self_service, should be the local service (for S4U2Self if
1795   impersonate_principal is given).
1796
1797   The target_service defaults to the krbtgt if NULL, but could be
1798   kpasswd/realm or a remote service (for S4U2Proxy)
1799
1800 */
1801 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
1802                                         krb5_ccache store_cc,
1803                                         krb5_principal init_principal,
1804                                         const char *init_password,
1805                                         krb5_principal impersonate_principal,
1806                                         const char *self_service,
1807                                         const char *target_service,
1808                                         krb5_get_init_creds_opt *krb_options,
1809                                         time_t *expire_time,
1810                                         time_t *kdc_time)
1811 {
1812         krb5_error_code code = 0;
1813         krb5_get_creds_opt options;
1814         krb5_principal store_principal;
1815         krb5_creds store_creds;
1816         krb5_creds *s4u2self_creds;
1817         Ticket s4u2self_ticket;
1818         size_t s4u2self_ticketlen;
1819         krb5_creds *s4u2proxy_creds;
1820         krb5_principal self_princ;
1821         bool s4u2proxy;
1822         krb5_principal target_princ;
1823         krb5_ccache tmp_cc;
1824         const char *self_realm;
1825         krb5_principal blacklist_principal = NULL;
1826         krb5_principal whitelist_principal = NULL;
1827
1828         code = krb5_get_init_creds_password(ctx, &store_creds,
1829                                             init_principal,
1830                                             init_password,
1831                                             NULL, NULL,
1832                                             0,
1833                                             NULL,
1834                                             krb_options);
1835         if (code != 0) {
1836                 return code;
1837         }
1838
1839         store_principal = init_principal;
1840
1841         /*
1842          * We are trying S4U2Self now:
1843          *
1844          * As we do not want to expose our TGT in the
1845          * krb5_ccache, which is also holds the impersonated creds.
1846          *
1847          * Some low level krb5/gssapi function might use the TGT
1848          * identity and let the client act as our machine account.
1849          *
1850          * We need to avoid that and use a temporary krb5_ccache
1851          * in order to pass our TGT to the krb5_get_creds() function.
1852          */
1853         code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1854         if (code != 0) {
1855                 krb5_free_cred_contents(ctx, &store_creds);
1856                 return code;
1857         }
1858
1859         code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1860         if (code != 0) {
1861                 krb5_cc_destroy(ctx, tmp_cc);
1862                 krb5_free_cred_contents(ctx, &store_creds);
1863                 return code;
1864         }
1865
1866         code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1867         if (code != 0) {
1868                 krb5_free_cred_contents(ctx, &store_creds);
1869                 krb5_cc_destroy(ctx, tmp_cc);
1870                 return code;
1871         }
1872
1873         /*
1874          * we need to remember the client principal of our
1875          * TGT and make sure the KDC does not return this
1876          * in the impersonated tickets. This can happen
1877          * if the KDC does not support S4U2Self and S4U2Proxy.
1878          */
1879         blacklist_principal = store_creds.client;
1880         store_creds.client = NULL;
1881         krb5_free_cred_contents(ctx, &store_creds);
1882
1883         /*
1884          * Check if we also need S4U2Proxy or if S4U2Self is
1885          * enough in order to get a ticket for the target.
1886          */
1887         if (target_service == NULL) {
1888                 s4u2proxy = false;
1889         } else if (strcmp(target_service, self_service) == 0) {
1890                 s4u2proxy = false;
1891         } else {
1892                 s4u2proxy = true;
1893         }
1894
1895         /*
1896          * For S4U2Self we need our own service principal,
1897          * which belongs to our own realm (available on
1898          * our client principal).
1899          */
1900         self_realm = krb5_principal_get_realm(ctx, init_principal);
1901
1902         code = krb5_parse_name(ctx, self_service, &self_princ);
1903         if (code != 0) {
1904                 krb5_free_principal(ctx, blacklist_principal);
1905                 krb5_cc_destroy(ctx, tmp_cc);
1906                 return code;
1907         }
1908
1909         code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1910         if (code != 0) {
1911                 krb5_free_principal(ctx, blacklist_principal);
1912                 krb5_free_principal(ctx, self_princ);
1913                 krb5_cc_destroy(ctx, tmp_cc);
1914                 return code;
1915         }
1916
1917         code = krb5_get_creds_opt_alloc(ctx, &options);
1918         if (code != 0) {
1919                 krb5_free_principal(ctx, blacklist_principal);
1920                 krb5_free_principal(ctx, self_princ);
1921                 krb5_cc_destroy(ctx, tmp_cc);
1922                 return code;
1923         }
1924
1925         if (s4u2proxy) {
1926                 /*
1927                  * If we want S4U2Proxy, we need the forwardable flag
1928                  * on the S4U2Self ticket.
1929                  */
1930                 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1931         }
1932
1933         code = krb5_get_creds_opt_set_impersonate(ctx, options,
1934                                                   impersonate_principal);
1935         if (code != 0) {
1936                 krb5_get_creds_opt_free(ctx, options);
1937                 krb5_free_principal(ctx, blacklist_principal);
1938                 krb5_free_principal(ctx, self_princ);
1939                 krb5_cc_destroy(ctx, tmp_cc);
1940                 return code;
1941         }
1942
1943         code = krb5_get_creds(ctx, options, tmp_cc,
1944                               self_princ, &s4u2self_creds);
1945         krb5_get_creds_opt_free(ctx, options);
1946         krb5_free_principal(ctx, self_princ);
1947         if (code != 0) {
1948                 krb5_free_principal(ctx, blacklist_principal);
1949                 krb5_cc_destroy(ctx, tmp_cc);
1950                 return code;
1951         }
1952
1953         if (!s4u2proxy) {
1954                 krb5_cc_destroy(ctx, tmp_cc);
1955
1956                 /*
1957                  * Now make sure we store the impersonated principal
1958                  * and creds instead of the TGT related stuff
1959                  * in the krb5_ccache of the caller.
1960                  */
1961                 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1962                                                 &store_creds);
1963                 krb5_free_creds(ctx, s4u2self_creds);
1964                 if (code != 0) {
1965                         return code;
1966                 }
1967
1968                 /*
1969                  * It's important to store the principal the KDC
1970                  * returned, as otherwise the caller would not find
1971                  * the S4U2Self ticket in the krb5_ccache lookup.
1972                  */
1973                 store_principal = store_creds.client;
1974                 goto store;
1975         }
1976
1977         /*
1978          * We are trying S4U2Proxy:
1979          *
1980          * We need the ticket from the S4U2Self step
1981          * and our TGT in order to get the delegated ticket.
1982          */
1983         code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1984                              s4u2self_creds->ticket.length,
1985                              &s4u2self_ticket,
1986                              &s4u2self_ticketlen);
1987         if (code != 0) {
1988                 krb5_free_creds(ctx, s4u2self_creds);
1989                 krb5_free_principal(ctx, blacklist_principal);
1990                 krb5_cc_destroy(ctx, tmp_cc);
1991                 return code;
1992         }
1993
1994         /*
1995          * we need to remember the client principal of the
1996          * S4U2Self stage and as it needs to match the one we
1997          * will get for the S4U2Proxy stage. We need this
1998          * in order to detect KDCs which does not support S4U2Proxy.
1999          */
2000         whitelist_principal = s4u2self_creds->client;
2001         s4u2self_creds->client = NULL;
2002         krb5_free_creds(ctx, s4u2self_creds);
2003
2004         /*
2005          * For S4U2Proxy we also got a target service principal,
2006          * which also belongs to our own realm (available on
2007          * our client principal).
2008          */
2009         code = krb5_parse_name(ctx, target_service, &target_princ);
2010         if (code != 0) {
2011                 free_Ticket(&s4u2self_ticket);
2012                 krb5_free_principal(ctx, whitelist_principal);
2013                 krb5_free_principal(ctx, blacklist_principal);
2014                 krb5_cc_destroy(ctx, tmp_cc);
2015                 return code;
2016         }
2017
2018         code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2019         if (code != 0) {
2020                 free_Ticket(&s4u2self_ticket);
2021                 krb5_free_principal(ctx, target_princ);
2022                 krb5_free_principal(ctx, whitelist_principal);
2023                 krb5_free_principal(ctx, blacklist_principal);
2024                 krb5_cc_destroy(ctx, tmp_cc);
2025                 return code;
2026         }
2027
2028         code = krb5_get_creds_opt_alloc(ctx, &options);
2029         if (code != 0) {
2030                 free_Ticket(&s4u2self_ticket);
2031                 krb5_free_principal(ctx, target_princ);
2032                 krb5_free_principal(ctx, whitelist_principal);
2033                 krb5_free_principal(ctx, blacklist_principal);
2034                 krb5_cc_destroy(ctx, tmp_cc);
2035                 return code;
2036         }
2037
2038         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2039         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2040
2041         code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2042         free_Ticket(&s4u2self_ticket);
2043         if (code != 0) {
2044                 krb5_get_creds_opt_free(ctx, options);
2045                 krb5_free_principal(ctx, target_princ);
2046                 krb5_free_principal(ctx, whitelist_principal);
2047                 krb5_free_principal(ctx, blacklist_principal);
2048                 krb5_cc_destroy(ctx, tmp_cc);
2049                 return code;
2050         }
2051
2052         code = krb5_get_creds(ctx, options, tmp_cc,
2053                               target_princ, &s4u2proxy_creds);
2054         krb5_get_creds_opt_free(ctx, options);
2055         krb5_free_principal(ctx, target_princ);
2056         krb5_cc_destroy(ctx, tmp_cc);
2057         if (code != 0) {
2058                 krb5_free_principal(ctx, whitelist_principal);
2059                 krb5_free_principal(ctx, blacklist_principal);
2060                 return code;
2061         }
2062
2063         /*
2064          * Now make sure we store the impersonated principal
2065          * and creds instead of the TGT related stuff
2066          * in the krb5_ccache of the caller.
2067          */
2068         code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2069                                         &store_creds);
2070         krb5_free_creds(ctx, s4u2proxy_creds);
2071         if (code != 0) {
2072                 krb5_free_principal(ctx, whitelist_principal);
2073                 krb5_free_principal(ctx, blacklist_principal);
2074                 return code;
2075         }
2076
2077         /*
2078          * It's important to store the principal the KDC
2079          * returned, as otherwise the caller would not find
2080          * the S4U2Self ticket in the krb5_ccache lookup.
2081          */
2082         store_principal = store_creds.client;
2083
2084  store:
2085         if (blacklist_principal &&
2086             krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2087                 char *sp = NULL;
2088                 char *ip = NULL;
2089
2090                 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2091                 if (code != 0) {
2092                         sp = NULL;
2093                 }
2094                 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2095                 if (code != 0) {
2096                         ip = NULL;
2097                 }
2098                 DEBUG(1, ("kerberos_kinit_password_cc: "
2099                           "KDC returned self principal[%s] while impersonating [%s]\n",
2100                           sp?sp:"<no memory>",
2101                           ip?ip:"<no memory>"));
2102
2103                 SAFE_FREE(sp);
2104                 SAFE_FREE(ip);
2105
2106                 krb5_free_principal(ctx, whitelist_principal);
2107                 krb5_free_principal(ctx, blacklist_principal);
2108                 krb5_free_cred_contents(ctx, &store_creds);
2109                 return KRB5_FWD_BAD_PRINCIPAL;
2110         }
2111         if (blacklist_principal) {
2112                 krb5_free_principal(ctx, blacklist_principal);
2113         }
2114
2115         if (whitelist_principal &&
2116             !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2117                 char *sp = NULL;
2118                 char *ep = NULL;
2119
2120                 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2121                 if (code != 0) {
2122                         sp = NULL;
2123                 }
2124                 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2125                 if (code != 0) {
2126                         ep = NULL;
2127                 }
2128                 DEBUG(1, ("kerberos_kinit_password_cc: "
2129                           "KDC returned wrong principal[%s] we expected [%s]\n",
2130                           sp?sp:"<no memory>",
2131                           ep?ep:"<no memory>"));
2132
2133                 SAFE_FREE(sp);
2134                 SAFE_FREE(ep);
2135
2136                 krb5_free_principal(ctx, whitelist_principal);
2137                 krb5_free_cred_contents(ctx, &store_creds);
2138                 return KRB5_FWD_BAD_PRINCIPAL;
2139         }
2140         if (whitelist_principal) {
2141                 krb5_free_principal(ctx, whitelist_principal);
2142         }
2143
2144         code = krb5_cc_initialize(ctx, store_cc, store_principal);
2145         if (code != 0) {
2146                 krb5_free_cred_contents(ctx, &store_creds);
2147                 return code;
2148         }
2149
2150         code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2151         if (code != 0) {
2152                 krb5_free_cred_contents(ctx, &store_creds);
2153                 return code;
2154         }
2155
2156         if (expire_time) {
2157                 *expire_time = (time_t) store_creds.times.endtime;
2158         }
2159
2160         if (kdc_time) {
2161                 *kdc_time = (time_t) store_creds.times.starttime;
2162         }
2163
2164         krb5_free_cred_contents(ctx, &store_creds);
2165
2166         return 0;
2167 }
2168 #endif
2169
2170 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2171 krb5_error_code smb_krb5_make_principal(krb5_context context,
2172                                         krb5_principal *principal,
2173                                         const char *_realm, ...)
2174 {
2175         krb5_error_code code;
2176         bool free_realm;
2177         char *realm;
2178         va_list ap;
2179
2180         if (_realm) {
2181                 realm = discard_const_p(char, _realm);
2182                 free_realm = false;
2183         } else {
2184                 code = krb5_get_default_realm(context, &realm);
2185                 if (code) {
2186                         return code;
2187                 }
2188                 free_realm = true;
2189         }
2190
2191         va_start(ap, _realm);
2192         code = krb5_build_principal_alloc_va(context, principal,
2193                                              strlen(realm), realm,
2194                                              ap);
2195         va_end(ap);
2196
2197         if (free_realm) {
2198                 krb5_free_default_realm(context, realm);
2199         }
2200
2201         return code;
2202 }
2203 #endif
2204
2205 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2206 /**
2207  * @brief Get the lifetime of the initial ticket in the cache.
2208  *
2209  * @param[in]  context  The kerberos context.
2210  *
2211  * @param[in]  id       The credential cache to get the ticket lifetime.
2212  *
2213  * @param[out] t        A pointer to a time value to store the lifetime.
2214  *
2215  * @return              0 on success, a krb5_error_code on error.
2216  */
2217 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2218                                          krb5_ccache id,
2219                                          time_t *t)
2220 {
2221         krb5_cc_cursor cursor;
2222         krb5_error_code kerr;
2223         krb5_creds cred;
2224         krb5_timestamp now;
2225
2226         *t = 0;
2227
2228         kerr = krb5_timeofday(context, &now);
2229         if (kerr) {
2230                 return kerr;
2231         }
2232
2233         kerr = krb5_cc_start_seq_get(context, id, &cursor);
2234         if (kerr) {
2235                 return kerr;
2236         }
2237
2238         while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2239 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2240                 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2241 #else
2242                 if (cred.flags.b.initial) {
2243 #endif
2244                         if (now < cred.times.endtime) {
2245                                 *t = (time_t) (cred.times.endtime - now);
2246                         }
2247                         krb5_free_cred_contents(context, &cred);
2248                         break;
2249                 }
2250                 krb5_free_cred_contents(context, &cred);
2251         }
2252
2253         krb5_cc_end_seq_get(context, id, &cursor);
2254
2255         return kerr;
2256 }
2257 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2258
2259 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2260 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2261 {
2262         free_Checksum(cksum);
2263 }
2264 #endif
2265
2266 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2267                                            DATA_BLOB *pac_data,
2268                                            krb5_context context,
2269                                            const krb5_keyblock *keyblock,
2270                                            uint32_t *sig_type,
2271                                            DATA_BLOB *sig_blob)
2272 {
2273         krb5_error_code ret;
2274         krb5_checksum cksum;
2275 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2276         krb5_crypto crypto;
2277
2278
2279         ret = krb5_crypto_init(context,
2280                                keyblock,
2281                                0,
2282                                &crypto);
2283         if (ret) {
2284                 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2285                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2286                 return ret;
2287         }
2288         ret = krb5_create_checksum(context,
2289                                    crypto,
2290                                    KRB5_KU_OTHER_CKSUM,
2291                                    0,
2292                                    pac_data->data,
2293                                    pac_data->length,
2294                                    &cksum);
2295         if (ret) {
2296                 DEBUG(2, ("PAC Verification failed: %s\n",
2297                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2298         }
2299
2300         krb5_crypto_destroy(context, crypto);
2301
2302         if (ret) {
2303                 return ret;
2304         }
2305
2306         *sig_type = cksum.cksumtype;
2307         *sig_blob = data_blob_talloc(mem_ctx,
2308                                         cksum.checksum.data,
2309                                         cksum.checksum.length);
2310 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2311         krb5_data input;
2312
2313         input.data = (char *)pac_data->data;
2314         input.length = pac_data->length;
2315
2316         ret = krb5_c_make_checksum(context,
2317                                    0,
2318                                    keyblock,
2319                                    KRB5_KEYUSAGE_APP_DATA_CKSUM,
2320                                    &input,
2321                                    &cksum);
2322         if (ret) {
2323                 DEBUG(2, ("PAC Verification failed: %s\n",
2324                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2325                 return ret;
2326         }
2327
2328         *sig_type = cksum.checksum_type;
2329         *sig_blob = data_blob_talloc(mem_ctx,
2330                                         cksum.contents,
2331                                         cksum.length);
2332
2333 #else
2334 #error krb5_create_checksum or krb5_c_make_checksum not available
2335 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2336         smb_krb5_free_checksum_contents(context, &cksum);
2337
2338         return 0;
2339 }
2340
2341
2342 /*
2343  * smb_krb5_principal_get_realm
2344  *
2345  * @brief Get realm of a principal
2346  *
2347  * @param[in] context           The krb5_context
2348  * @param[in] principal         The principal
2349  * @return pointer to the realm
2350  *
2351  * Caller must free if the return value is not NULL.
2352  *
2353  */
2354
2355 char *smb_krb5_principal_get_realm(krb5_context context,
2356                                    krb5_const_principal principal)
2357 {
2358 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2359         return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
2360 #elif defined(krb5_princ_realm) /* MIT */
2361         krb5_data *realm;
2362         realm = discard_const_p(krb5_data,
2363                                 krb5_princ_realm(context, principal));
2364         return strndup(realm->data, realm->length);
2365 #else
2366 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2367 #endif
2368 }
2369
2370 /*
2371  * smb_krb5_principal_set_realm
2372  *
2373  * @brief Get realm of a principal
2374  *
2375  * @param[in] context           The krb5_context
2376  * @param[in] principal         The principal
2377  * @param[in] realm             The realm
2378  * @return                      0 on success, a krb5_error_code on error.
2379  *
2380  */
2381
2382 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2383                                              krb5_principal principal,
2384                                              const char *realm)
2385 {
2386 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2387         return krb5_principal_set_realm(context, principal, realm);
2388 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2389         krb5_error_code ret;
2390         krb5_data data;
2391         krb5_data *old_data;
2392
2393         old_data = krb5_princ_realm(context, principal);
2394
2395         ret = smb_krb5_copy_data_contents(&data,
2396                                           realm,
2397                                           strlen(realm));
2398         if (ret) {
2399                 return ret;
2400         }
2401
2402         /* free realm before setting */
2403         free(old_data->data);
2404
2405         krb5_princ_set_realm(context, principal, &data);
2406
2407         return ret;
2408 #else
2409 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2410 #endif
2411 }
2412
2413
2414 /************************************************************************
2415  Routine to get the default realm from the kerberos credentials cache.
2416  Caller must free if the return value is not NULL.
2417 ************************************************************************/
2418
2419 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2420 {
2421         char *realm = NULL;
2422         krb5_context ctx = NULL;
2423         krb5_ccache cc = NULL;
2424         krb5_principal princ = NULL;
2425
2426         initialize_krb5_error_table();
2427         if (krb5_init_context(&ctx)) {
2428                 return NULL;
2429         }
2430
2431         DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2432                 "Trying to read krb5 cache: %s\n",
2433                 krb5_cc_default_name(ctx)));
2434         if (krb5_cc_default(ctx, &cc)) {
2435                 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2436                         "failed to read default cache\n"));
2437                 goto out;
2438         }
2439         if (krb5_cc_get_principal(ctx, cc, &princ)) {
2440                 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2441                         "failed to get default principal\n"));
2442                 goto out;
2443         }
2444
2445 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2446         realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2447 #elif defined(HAVE_KRB5_PRINC_REALM)
2448         {
2449                 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2450                 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2451         }
2452 #endif
2453
2454   out:
2455
2456         if (ctx) {
2457                 if (princ) {
2458                         krb5_free_principal(ctx, princ);
2459                 }
2460                 if (cc) {
2461                         krb5_cc_close(ctx, cc);
2462                 }
2463                 krb5_free_context(ctx);
2464         }
2465
2466         return realm;
2467 }
2468
2469 /************************************************************************
2470  Routine to get the realm from a given DNS name.
2471 ************************************************************************/
2472
2473 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2474                                                 const char *hostname)
2475 {
2476 #if defined(HAVE_KRB5_REALM_TYPE)
2477         /* Heimdal. */
2478         krb5_realm *realm_list = NULL;
2479 #else
2480         /* MIT */
2481         char **realm_list = NULL;
2482 #endif
2483         char *realm = NULL;
2484         krb5_error_code kerr;
2485         krb5_context ctx = NULL;
2486
2487         initialize_krb5_error_table();
2488         if (krb5_init_context(&ctx)) {
2489                 return NULL;
2490         }
2491
2492         kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2493         if (kerr != 0) {
2494                 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2495                         "failed %s\n",
2496                         hostname ? hostname : "(NULL)",
2497                         error_message(kerr) ));
2498                 goto out;
2499         }
2500
2501         if (realm_list && realm_list[0]) {
2502                 realm = talloc_strdup(mem_ctx, realm_list[0]);
2503         }
2504
2505   out:
2506
2507         if (ctx) {
2508                 if (realm_list) {
2509                         krb5_free_host_realm(ctx, realm_list);
2510                         realm_list = NULL;
2511                 }
2512                 krb5_free_context(ctx);
2513                 ctx = NULL;
2514         }
2515         return realm;
2516 }
2517
2518 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2519                                                    const char *service,
2520                                                    const char *remote_name,
2521                                                    const char *default_realm)
2522 {
2523         char *realm = NULL;
2524         char *host = NULL;
2525         char *principal;
2526         host = strchr_m(remote_name, '.');
2527         if (host) {
2528                 /* DNS name. */
2529                 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2530                                                          remote_name);
2531         } else {
2532                 /* NetBIOS name - use our realm. */
2533                 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2534         }
2535
2536         if (realm == NULL || *realm == '\0') {
2537                 realm = talloc_strdup(talloc_tos(), default_realm);
2538                 if (!realm) {
2539                         return NULL;
2540                 }
2541                 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2542                          "cannot get realm from, "
2543                          "desthost %s or default ccache. Using default "
2544                          "smb.conf realm %s\n",
2545                          remote_name,
2546                          realm));
2547         }
2548
2549         principal = talloc_asprintf(mem_ctx,
2550                                     "%s/%s@%s",
2551                                     service, remote_name,
2552                                     realm);
2553         TALLOC_FREE(realm);
2554         return principal;
2555 }
2556
2557 char *smb_get_krb5_error_message(krb5_context context,
2558                                  krb5_error_code code,
2559                                  TALLOC_CTX *mem_ctx)
2560 {
2561         char *ret;
2562
2563 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2564         const char *context_error = krb5_get_error_message(context, code);
2565         if (context_error) {
2566                 ret = talloc_asprintf(mem_ctx, "%s: %s",
2567                                         error_message(code), context_error);
2568                 krb5_free_error_message(context, context_error);
2569                 return ret;
2570         }
2571 #endif
2572         ret = talloc_strdup(mem_ctx, error_message(code));
2573         return ret;
2574 }
2575
2576
2577 /**
2578 * @brief Return the kerberos library setting for "libdefaults:allow_weak_crypto"
2579 *
2580 * @param context        The krb5_context
2581 *
2582 * @return krb5_boolean
2583 *
2584 * Function returns true if weak crypto is allowd, false if not
2585 */
2586
2587 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2588 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2589 {
2590         return krb5_config_get_bool_default(context,
2591                                             NULL,
2592                                             FALSE,
2593                                             "libdefaults",
2594                                             "allow_weak_crypto",
2595                                             NULL);
2596 }
2597 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2598 {
2599 #include <profile.h>
2600         krb5_error_code ret;
2601         krb5_boolean ret_default = false;
2602         profile_t profile;
2603         int ret_profile;
2604
2605         ret = krb5_get_profile(context,
2606                                &profile);
2607         if (ret) {
2608                 return ret_default;
2609         }
2610
2611         ret = profile_get_boolean(profile,
2612                                   "libdefaults",
2613                                   "allow_weak_crypto",
2614                                   NULL, /* subsubname */
2615                                   ret_default, /* def_val */
2616                                   &ret_profile /* *ret_default */);
2617         if (ret) {
2618                 return ret_default;
2619         }
2620
2621         profile_release(profile);
2622
2623         return ret_profile;
2624 }
2625 #else
2626 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2627 #endif
2628
2629 /**
2630 * @brief Return the type of a krb5_principal
2631 *
2632 * @param context        The krb5_context
2633 * @param principal      The const krb5_principal
2634 *
2635 * @return integer type of the principal
2636 */
2637 int smb_krb5_principal_get_type(krb5_context context,
2638                                 krb5_const_principal principal)
2639 {
2640 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2641         return krb5_principal_get_type(context, principal);
2642 #elif defined(krb5_princ_type) /* MIT */
2643         return krb5_princ_type(context, principal);
2644 #else
2645 #error  UNKNOWN_PRINC_GET_TYPE_FUNCTION
2646 #endif
2647 }
2648
2649 /**
2650 * @brief Set the type of a krb5_principal
2651 *
2652 * @param context        The krb5_context
2653 * @param principal      The const krb5_principal
2654 * @param type           The principal type
2655 *
2656 */
2657 void smb_krb5_principal_set_type(krb5_context context,
2658                                  krb5_principal principal,
2659                                  int type)
2660 {
2661 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
2662         krb5_principal_set_type(context, principal, type);
2663 #elif defined(krb5_princ_type) /* MIT */
2664         krb5_princ_type(context, principal) = type;
2665 #else
2666 #error  UNKNOWN_PRINC_SET_TYPE_FUNCTION
2667 #endif
2668 }
2669
2670 /**
2671 * @brief Generate a krb5 warning, forwarding to com_err
2672 *
2673 * @param context        The krb5_context
2674 * @param fmt            The message format
2675 * @param ...            The message arguments
2676 *
2677 * @return
2678 */
2679 #if !defined(HAVE_KRB5_WARNX)
2680 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
2681 {
2682         va_list args;
2683
2684         va_start(args, fmt);
2685         com_err_va("kdb_samba", errno, fmt, args);
2686         va_end(args);
2687
2688         return 0;
2689 }
2690 #endif
2691
2692 krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
2693                                        krb5_ccache incc, krb5_ccache outcc)
2694 {
2695 #ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
2696         return krb5_cc_copy_cache(context, incc, outcc);
2697 #elif defined(HAVE_KRB5_CC_COPY_CREDS)
2698         return krb5_cc_copy_creds(context, incc, outcc);
2699 #else
2700 #error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
2701 #endif
2702 }
2703
2704 /**********************************************************
2705  * ADS KRB5 CALLS
2706  **********************************************************/
2707
2708 static bool ads_cleanup_expired_creds(krb5_context context,
2709                                       krb5_ccache  ccache,
2710                                       krb5_creds  *credsp)
2711 {
2712         krb5_error_code retval;
2713         const char *cc_type = krb5_cc_get_type(context, ccache);
2714
2715         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
2716                   cc_type, krb5_cc_get_name(context, ccache),
2717                   http_timestring(talloc_tos(), credsp->times.endtime)));
2718
2719         /* we will probably need new tickets if the current ones
2720            will expire within 10 seconds.
2721         */
2722         if (credsp->times.endtime >= (time(NULL) + 10))
2723                 return false;
2724
2725         /* heimdal won't remove creds from a file ccache, and
2726            perhaps we shouldn't anyway, since internally we
2727            use memory ccaches, and a FILE one probably means that
2728            we're using creds obtained outside of our exectuable
2729         */
2730         if (strequal(cc_type, "FILE")) {
2731                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
2732                 return false;
2733         }
2734
2735         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
2736         if (retval) {
2737                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
2738                           error_message(retval)));
2739                 /* If we have an error in this, we want to display it,
2740                    but continue as though we deleted it */
2741         }
2742         return true;
2743 }
2744
2745 /* Allocate and setup the auth context into the state we need. */
2746
2747 static krb5_error_code ads_setup_auth_context(krb5_context context,
2748                                               krb5_auth_context *auth_context)
2749 {
2750         krb5_error_code retval;
2751
2752         retval = krb5_auth_con_init(context, auth_context );
2753         if (retval) {
2754                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
2755                         error_message(retval)));
2756                 return retval;
2757         }
2758
2759         /* Ensure this is an addressless ticket. */
2760         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
2761         if (retval) {
2762                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
2763                         error_message(retval)));
2764         }
2765
2766         return retval;
2767 }
2768
2769 #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)
2770 static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
2771                                                uint32_t gss_flags)
2772 {
2773         unsigned int orig_length = in_data->length;
2774         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
2775         char *gss_cksum = NULL;
2776
2777         if (orig_length) {
2778                 /* Extra length field for delgated ticket. */
2779                 base_cksum_size += 4;
2780         }
2781
2782         if ((unsigned int)base_cksum_size + orig_length <
2783                         (unsigned int)base_cksum_size) {
2784                 return EINVAL;
2785         }
2786
2787         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
2788         if (gss_cksum == NULL) {
2789                 return ENOMEM;
2790         }
2791
2792         memset(gss_cksum, '\0', base_cksum_size + orig_length);
2793         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
2794
2795         /*
2796          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
2797          * This matches the behavior of heimdal and mit.
2798          *
2799          * And it is needed to work against some closed source
2800          * SMB servers.
2801          *
2802          * See bug #7883
2803          */
2804         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
2805
2806         SIVAL(gss_cksum, 20, gss_flags);
2807
2808         if (orig_length) {
2809                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
2810                 SSVAL(gss_cksum, 26, orig_length);
2811                 /* Copy the kerberos KRB_CRED data */
2812                 memcpy(gss_cksum + 28, in_data->data, orig_length);
2813                 free(in_data->data);
2814                 in_data->data = NULL;
2815                 in_data->length = 0;
2816         }
2817         in_data->data = gss_cksum;
2818         in_data->length = base_cksum_size + orig_length;
2819         return 0;
2820 }
2821 #endif
2822
2823 /*
2824  * We can't use krb5_mk_req because w2k wants the service to be in a particular
2825  * format.
2826  */
2827 static krb5_error_code ads_krb5_mk_req(krb5_context context,
2828                                        krb5_auth_context *auth_context,
2829                                        const krb5_flags ap_req_options,
2830                                        const char *principal,
2831                                        krb5_ccache ccache,
2832                                        krb5_data *outbuf,
2833                                        time_t *expire_time,
2834                                        const char *impersonate_princ_s)
2835 {
2836         krb5_error_code retval;
2837         krb5_principal server;
2838         krb5_principal impersonate_princ = NULL;
2839         krb5_creds *credsp;
2840         krb5_creds creds;
2841         krb5_data in_data;
2842         bool creds_ready = false;
2843         int i = 0, maxtries = 3;
2844         bool ok;
2845
2846         ZERO_STRUCT(in_data);
2847
2848         retval = smb_krb5_parse_name(context, principal, &server);
2849         if (retval != 0) {
2850                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
2851                 return retval;
2852         }
2853
2854         if (impersonate_princ_s) {
2855                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
2856                                              &impersonate_princ);
2857                 if (retval) {
2858                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
2859                         goto cleanup_princ;
2860                 }
2861         }
2862
2863         /* obtain ticket & session key */
2864         ZERO_STRUCT(creds);
2865         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
2866                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
2867                          error_message(retval)));
2868                 goto cleanup_princ;
2869         }
2870
2871         retval = krb5_cc_get_principal(context, ccache, &creds.client);
2872         if (retval != 0) {
2873                 /* This can commonly fail on smbd startup with no ticket in the cache.
2874                  * Report at higher level than 1. */
2875                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
2876                          error_message(retval)));
2877                 goto cleanup_creds;
2878         }
2879
2880         while (!creds_ready && (i < maxtries)) {
2881
2882                 retval = smb_krb5_get_credentials(context,
2883                                                   ccache,
2884                                                   creds.client,
2885                                                   creds.server,
2886                                                   impersonate_princ,
2887                                                   &credsp);
2888                 if (retval != 0) {
2889                         DBG_WARNING("smb_krb5_get_credentials failed for %s "
2890                                     "(%s)\n",
2891                                     principal,
2892                                     error_message(retval));
2893                         goto cleanup_creds;
2894                 }
2895
2896                 /* cope with ticket being in the future due to clock skew */
2897                 if ((unsigned)credsp->times.starttime > time(NULL)) {
2898                         time_t t = time(NULL);
2899                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
2900                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
2901                         krb5_set_real_time(context, t + time_offset + 1, 0);
2902                 }
2903
2904                 ok = ads_cleanup_expired_creds(context, ccache, credsp);
2905                 if (!ok) {
2906                         creds_ready = true;
2907                 }
2908
2909                 i++;
2910         }
2911
2912         DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
2913                   principal,
2914                   krb5_cc_get_type(context, ccache),
2915                   krb5_cc_get_name(context, ccache),
2916                   http_timestring(talloc_tos(),
2917                                   (unsigned)credsp->times.endtime),
2918                   (unsigned)credsp->times.endtime);
2919
2920         if (expire_time) {
2921                 *expire_time = (time_t)credsp->times.endtime;
2922         }
2923
2924         /* Allocate the auth_context. */
2925         retval = ads_setup_auth_context(context, auth_context);
2926         if (retval != 0) {
2927                 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
2928                             error_message(retval));
2929                 goto cleanup_creds;
2930         }
2931
2932 #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)
2933         {
2934                 uint32_t gss_flags = 0;
2935
2936                 if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
2937                         /*
2938                          * Fetch a forwarded TGT from the KDC so that we can
2939                          * hand off a 2nd ticket as part of the kerberos
2940                          * exchange.
2941                          */
2942
2943                         DBG_INFO("Server marked as OK to delegate to, building "
2944                                  "forwardable TGT\n");
2945
2946                         retval = krb5_auth_con_setuseruserkey(context,
2947                                         *auth_context,
2948                                         &credsp->keyblock );
2949                         if (retval != 0) {
2950                                 DBG_WARNING("krb5_auth_con_setuseruserkey "
2951                                             "failed (%s)\n",
2952                                             error_message(retval)));
2953                                 goto cleanup_creds;
2954                         }
2955
2956                         /* Must use a subkey for forwarded tickets. */
2957                         retval = krb5_auth_con_setflags(context,
2958                                                         *auth_context,
2959                                                         KRB5_AUTH_CONTEXT_USE_SUBKEY);
2960                         if (retval != 0) {
2961                                 DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
2962                                             error_message(retval)));
2963                                 goto cleanup_creds;
2964                         }
2965
2966                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
2967                                 *auth_context,  /* Authentication context [in] */
2968                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
2969                                 credsp->client, /* Client principal for the tgt [in] */
2970                                 credsp->server, /* Server principal for the tgt [in] */
2971                                 ccache,         /* Credential cache to use for storage [in] */
2972                                 1,              /* Turn on for "Forwardable ticket" [in] */
2973                                 &in_data );     /* Resulting response [out] */
2974
2975                         if (retval) {
2976                                 DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
2977                                          error_message(retval));
2978
2979                                 /*
2980                                  * This is not fatal. Delete the *auth_context and continue
2981                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
2982                                  */
2983
2984                                 if (in_data.data) {
2985                                         free( in_data.data );
2986                                         in_data.data = NULL;
2987                                         in_data.length = 0;
2988                                 }
2989                                 krb5_auth_con_free(context, *auth_context);
2990                                 *auth_context = NULL;
2991                                 retval = ads_setup_auth_context(context, auth_context);
2992                                 if (retval != 0) {
2993                                         DBG_WARNING("ads_setup_auth_context failed (%s)\n",
2994                                                     error_message(retval)));
2995                                         goto cleanup_creds;
2996                                 }
2997                         } else {
2998                                 /* We got a delegated ticket. */
2999                                 gss_flags |= GSS_C_DELEG_FLAG;
3000                         }
3001                 }
3002
3003                 /* Frees and reallocates in_data into a GSS checksum blob. */
3004                 retval = ads_create_gss_checksum(&in_data, gss_flags);
3005                 if (retval != 0) {
3006                         goto cleanup_data;
3007                 }
3008
3009                 /* We always want GSS-checksum types. */
3010                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
3011                 if (retval != 0) {
3012                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
3013                                 error_message(retval)));
3014                         goto cleanup_data;
3015                 }
3016         }
3017 #endif
3018
3019         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
3020                                       &in_data, credsp, outbuf);
3021         if (retval != 0) {
3022                 DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
3023                             error_message(retval));
3024         }
3025
3026 #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)
3027 cleanup_data:
3028 #endif
3029
3030         if (in_data.data) {
3031                 free( in_data.data );
3032                 in_data.length = 0;
3033         }
3034
3035         krb5_free_creds(context, credsp);
3036
3037 cleanup_creds:
3038         krb5_free_cred_contents(context, &creds);
3039
3040 cleanup_princ:
3041         krb5_free_principal(context, server);
3042         if (impersonate_princ) {
3043                 krb5_free_principal(context, impersonate_princ);
3044         }
3045
3046         return retval;
3047 }
3048
3049 /*
3050   get a kerberos5 ticket for the given service
3051 */
3052 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3053                             const char *principal,
3054                             time_t time_offset,
3055                             DATA_BLOB *ticket,
3056                             DATA_BLOB *session_key_krb5,
3057                             uint32_t extra_ap_opts, const char *ccname,
3058                             time_t *tgs_expire,
3059                             const char *impersonate_princ_s)
3060 {
3061         krb5_error_code retval;
3062         krb5_data packet;
3063         krb5_context context = NULL;
3064         krb5_ccache ccdef = NULL;
3065         krb5_auth_context auth_context = NULL;
3066         krb5_enctype enc_types[] = {
3067 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
3068                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
3069 #endif
3070 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
3071                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
3072 #endif
3073                 ENCTYPE_ARCFOUR_HMAC,
3074                 ENCTYPE_DES_CBC_MD5,
3075                 ENCTYPE_DES_CBC_CRC,
3076                 ENCTYPE_NULL};
3077         bool ok;
3078
3079         initialize_krb5_error_table();
3080         retval = krb5_init_context(&context);
3081         if (retval != 0) {
3082                 DBG_WARNING("krb5_init_context failed (%s)\n",
3083                             error_message(retval));
3084                 goto failed;
3085         }
3086
3087         if (time_offset != 0) {
3088                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
3089         }
3090
3091         retval = krb5_cc_resolve(context,
3092                                  ccname ? ccname : krb5_cc_default_name(context),
3093                                  &ccdef);
3094         if (retval != 0) {
3095                 DBG_WARNING("krb5_cc_default failed (%s)\n",
3096                             error_message(retval));
3097                 goto failed;
3098         }
3099
3100         retval = krb5_set_default_tgs_ktypes(context, enc_types);
3101         if (retval != 0) {
3102                 DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
3103                             error_message(retval));
3104                 goto failed;
3105         }
3106
3107         retval = ads_krb5_mk_req(context,
3108                                  &auth_context,
3109                                  AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
3110                                  principal,
3111                                  ccdef,
3112                                  &packet,
3113                                  tgs_expire,
3114                                  impersonate_princ_s);
3115         if (retval != 0) {
3116                 goto failed;
3117         }
3118
3119         ok = get_krb5_smb_session_key(mem_ctx,
3120                                       context,
3121                                       auth_context,
3122                                       session_key_krb5,
3123                                       false);
3124         if (!ok) {
3125                 retval = ENOMEM;
3126                 goto failed;
3127         }
3128
3129         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
3130
3131         smb_krb5_free_data_contents(context, &packet);
3132
3133 failed:
3134
3135         if (context) {
3136                 if (ccdef) {
3137                         krb5_cc_close(context, ccdef);
3138                 }
3139                 if (auth_context) {
3140                         krb5_auth_con_free(context, auth_context);
3141                 }
3142                 krb5_free_context(context);
3143         }
3144
3145         return retval;
3146 }
3147
3148 #else /* HAVE_KRB5 */
3149 /* This saves a few linking headaches */
3150 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3151                             const char *principal,
3152                             time_t time_offset,
3153                             DATA_BLOB *ticket,
3154                             DATA_BLOB *session_key_krb5,
3155                             uint32_t extra_ap_opts, const char *ccname,
3156                             time_t *tgs_expire,
3157                             const char *impersonate_princ_s)
3158 {
3159          DEBUG(0,("NO KERBEROS SUPPORT\n"));
3160          return 1;
3161 }
3162
3163 #endif /* HAVE_KRB5 */