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 #ifndef KRB5_AUTHDATA_WIN2K_PAC
  29 #define KRB5_AUTHDATA_WIN2K_PAC 128
  30 #endif
  31
  32 #ifndef KRB5_AUTHDATA_IF_RELEVANT
  33 #define KRB5_AUTHDATA_IF_RELEVANT 1
  34 #endif
  35
  36 #ifdef HAVE_KRB5
  37
  38 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  39 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  40 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
  41                                                         bind field, flags field. */
  42 #define GSS_C_DELEG_FLAG 1
  43
  44 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
  45    but still has the symbol */
  46 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
  47 krb5_error_code krb5_auth_con_set_req_cksumtype(
  48         krb5_context     context,
  49         krb5_auth_context      auth_context,
  50         krb5_cksumtype     cksumtype);
  51 #endif
  52
  53 #if !defined(SMB_MALLOC)
  54 #undef malloc
  55 #define SMB_MALLOC(s) malloc((s))
  56 #endif
  57
  58 #ifndef SMB_STRDUP
  59 #define SMB_STRDUP(s) strdup(s)
  60 #endif
  61
  62 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
  63
  64 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
  65
  66 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
  67  * to krb5_set_default_tgs_ktypes. See
  68  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
  69  *
  70  * If the MIT libraries are not exporting internal symbols, we will end up in
  71  * this branch, which is correct. Otherwise we will continue to use the
  72  * internal symbol
  73  */
  74  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  75 {
  76     return krb5_set_default_tgs_enctypes(ctx, enc);
  77 }
  78
  79 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
  80
  81 /* Heimdal */
  82  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  83 {
  84         return krb5_set_default_in_tkt_etypes(ctx, enc);
  85 }
  86
  87 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
  88
  89 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
  90
  91 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
  92 /* HEIMDAL */
  93  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
  94 {
  95         memset(pkaddr, '\0', sizeof(krb5_address));
  96 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
  97         if (paddr->ss_family == AF_INET6) {
  98                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
  99                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 100                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 101                 return true;
 102         }
 103 #endif
 104         if (paddr->ss_family == AF_INET) {
 105                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 106                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 107                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 108                 return true;
 109         }
 110         return false;
 111 }
 112 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 113 /* MIT */
 114 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 115 {
 116         memset(pkaddr, '\0', sizeof(krb5_address));
 117 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 118         if (paddr->ss_family == AF_INET6) {
 119                 pkaddr->addrtype = ADDRTYPE_INET6;
 120                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 121                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 122                 return true;
 123         }
 124 #endif
 125         if (paddr->ss_family == AF_INET) {
 126                 pkaddr->addrtype = ADDRTYPE_INET;
 127                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 128                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 129                 return true;
 130         }
 131         return false;
 132 }
 133 #else
 134 #error UNKNOWN_ADDRTYPE
 135 #endif
 136
 137 /**
 138 * @brief Create a keyblock based on input parameters
 139 *
 140 * @param context        The krb5_context
 141 * @param host_princ     The krb5_principal to use
 142 * @param salt           The optional salt, if ommitted, salt is calculated with
 143 *                       the provided principal.
 144 * @param password       The krb5_data containing the password
 145 * @param enctype        The krb5_enctype to use for the keyblock generation
 146 * @param key            The returned krb5_keyblock, caller needs to free with
 147 *                       krb5_free_keyblock().
 148 *
 149 * @return krb5_error_code
 150 */
 151 int smb_krb5_create_key_from_string(krb5_context context,
 152                                     krb5_principal *host_princ,
 153                                     krb5_data *salt,
 154                                     krb5_data *password,
 155                                     krb5_enctype enctype,
 156                                     krb5_keyblock *key)
 157 {
 158         int ret = 0;
 159
 160         if (host_princ == NULL && salt == NULL) {
 161                 return -1;
 162         }
 163
 164 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
 165 {/* MIT */
 166         krb5_data _salt;
 167
 168         if (salt == NULL) {
 169                 ret = krb5_principal2salt(context, *host_princ, &_salt);
 170                 if (ret) {
 171                         DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 172                         return ret;
 173                 }
 174         } else {
 175                 _salt = *salt;
 176         }
 177         ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
 178         if (salt == NULL) {
 179                 SAFE_FREE(_salt.data);
 180         }
 181 }
 182 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 183 {/* Heimdal */
 184         krb5_salt _salt;
 185
 186         if (salt == NULL) {
 187                 ret = krb5_get_pw_salt(context, *host_princ, &_salt);
 188                 if (ret) {
 189                         DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 190                         return ret;
 191                 }
 192         } else {
 193                 _salt.saltvalue = *salt;
 194                 _salt.salttype = KRB5_PW_SALT;
 195         }
 196
 197         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
 198         if (salt == NULL) {
 199                 krb5_free_salt(context, _salt);
 200         }
 201 }
 202 #else
 203 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 204 #endif
 205         return ret;
 206 }
 207
 208 /**
 209 * @brief Create a salt for a given principal
 210 *
 211 * @param context        The initialized krb5_context
 212 * @param host_princ     The krb5_principal to create the salt for
 213 * @param psalt          A pointer to a krb5_data struct
 214 *
 215 * caller has to free the contents of psalt with kerberos_free_data_contents
 216 * when function has succeeded
 217 *
 218 * @return krb5_error_code, returns 0 on success, error code otherwise
 219 */
 220
 221 int smb_krb5_get_pw_salt(krb5_context context,
 222                          krb5_principal host_princ,
 223                          krb5_data *psalt)
 224 #if defined(HAVE_KRB5_GET_PW_SALT)
 225 /* Heimdal */
 226 {
 227         int ret;
 228         krb5_salt salt;
 229
 230         ret = krb5_get_pw_salt(context, host_princ, &salt);
 231         if (ret) {
 232                 return ret;
 233         }
 234
 235         psalt->data = salt.saltvalue.data;
 236         psalt->length = salt.saltvalue.length;
 237
 238         return ret;
 239 }
 240 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
 241 /* MIT */
 242 {
 243         return krb5_principal2salt(context, host_princ, psalt);
 244 }
 245 #else
 246 #error UNKNOWN_SALT_FUNCTIONS
 247 #endif
 248
 249 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 250  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 251                                             krb5_enctype **enctypes)
 252 {
 253         return krb5_get_permitted_enctypes(context, enctypes);
 254 }
 255 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 256  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 257                                             krb5_enctype **enctypes)
 258 {
 259 #ifdef HAVE_KRB5_PDU_NONE_DECL
 260         return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
 261 #else
 262         return krb5_get_default_in_tkt_etypes(context, enctypes);
 263 #endif
 264 }
 265 #else
 266 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 267 #endif
 268
 269 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 270  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 271                                         krb5_auth_context auth_context,
 272                                         krb5_keyblock *keyblock)
 273 {
 274         return krb5_auth_con_setkey(context, auth_context, keyblock);
 275 }
 276 #endif
 277
 278 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 279                            DATA_BLOB *edata,
 280                            DATA_BLOB *edata_out)
 281 {
 282         DATA_BLOB edata_contents;
 283         ASN1_DATA *data;
 284         int edata_type;
 285
 286         if (!edata->length) {
 287                 return false;
 288         }
 289
 290         data = asn1_init(mem_ctx);
 291         if (data == NULL) {
 292                 return false;
 293         }
 294
 295         asn1_load(data, *edata);
 296         asn1_start_tag(data, ASN1_SEQUENCE(0));
 297         asn1_start_tag(data, ASN1_CONTEXT(1));
 298         asn1_read_Integer(data, &edata_type);
 299
 300         if (edata_type != KRB5_PADATA_PW_SALT) {
 301                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 302                         KRB5_PADATA_PW_SALT, edata_type));
 303                 asn1_free(data);
 304                 return false;
 305         }
 306
 307         asn1_start_tag(data, ASN1_CONTEXT(2));
 308         asn1_read_OctetString(data, talloc_tos(), &edata_contents);
 309         asn1_end_tag(data);
 310         asn1_end_tag(data);
 311         asn1_end_tag(data);
 312         asn1_free(data);
 313
 314         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 315
 316         data_blob_free(&edata_contents);
 317
 318         return true;
 319 }
 320
 321
 322 static bool ads_cleanup_expired_creds(krb5_context context,
 323                                       krb5_ccache  ccache,
 324                                       krb5_creds  *credsp)
 325 {
 326         krb5_error_code retval;
 327         const char *cc_type = krb5_cc_get_type(context, ccache);
 328
 329         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 330                   cc_type, krb5_cc_get_name(context, ccache),
 331                   http_timestring(talloc_tos(), credsp->times.endtime)));
 332
 333         /* we will probably need new tickets if the current ones
 334            will expire within 10 seconds.
 335         */
 336         if (credsp->times.endtime >= (time(NULL) + 10))
 337                 return false;
 338
 339         /* heimdal won't remove creds from a file ccache, and
 340            perhaps we shouldn't anyway, since internally we
 341            use memory ccaches, and a FILE one probably means that
 342            we're using creds obtained outside of our exectuable
 343         */
 344         if (strequal(cc_type, "FILE")) {
 345                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 346                 return false;
 347         }
 348
 349         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 350         if (retval) {
 351                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 352                           error_message(retval)));
 353                 /* If we have an error in this, we want to display it,
 354                    but continue as though we deleted it */
 355         }
 356         return true;
 357 }
 358
 359 /* Allocate and setup the auth context into the state we need. */
 360
 361 static krb5_error_code setup_auth_context(krb5_context context,
 362                         krb5_auth_context *auth_context)
 363 {
 364         krb5_error_code retval;
 365
 366         retval = krb5_auth_con_init(context, auth_context );
 367         if (retval) {
 368                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 369                         error_message(retval)));
 370                 return retval;
 371         }
 372
 373         /* Ensure this is an addressless ticket. */
 374         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 375         if (retval) {
 376                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 377                         error_message(retval)));
 378         }
 379
 380         return retval;
 381 }
 382
 383 #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)
 384 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 385                                                 uint32_t gss_flags)
 386 {
 387         unsigned int orig_length = in_data->length;
 388         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 389         char *gss_cksum = NULL;
 390
 391         if (orig_length) {
 392                 /* Extra length field for delgated ticket. */
 393                 base_cksum_size += 4;
 394         }
 395
 396         if ((unsigned int)base_cksum_size + orig_length <
 397                         (unsigned int)base_cksum_size) {
 398                 return EINVAL;
 399         }
 400
 401         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 402         if (gss_cksum == NULL) {
 403                 return ENOMEM;
 404         }
 405
 406         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 407         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 408
 409         /*
 410          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 411          * This matches the behavior of heimdal and mit.
 412          *
 413          * And it is needed to work against some closed source
 414          * SMB servers.
 415          *
 416          * See bug #7883
 417          */
 418         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 419
 420         SIVAL(gss_cksum, 20, gss_flags);
 421
 422         if (orig_length) {
 423                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 424                 SSVAL(gss_cksum, 26, orig_length);
 425                 /* Copy the kerberos KRB_CRED data */
 426                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 427                 free(in_data->data);
 428                 in_data->data = NULL;
 429                 in_data->length = 0;
 430         }
 431         in_data->data = gss_cksum;
 432         in_data->length = base_cksum_size + orig_length;
 433         return 0;
 434 }
 435 #endif
 436
 437 /**************************************************************
 438  krb5_parse_name that takes a UNIX charset.
 439 **************************************************************/
 440
 441 krb5_error_code smb_krb5_parse_name(krb5_context context,
 442                                 const char *name, /* in unix charset */
 443                                 krb5_principal *principal)
 444 {
 445         krb5_error_code ret;
 446         char *utf8_name;
 447         size_t converted_size;
 448         TALLOC_CTX *frame = talloc_stackframe();
 449
 450         if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
 451                 talloc_free(frame);
 452                 return ENOMEM;
 453         }
 454
 455         ret = krb5_parse_name(context, utf8_name, principal);
 456         TALLOC_FREE(frame);
 457         return ret;
 458 }
 459
 460 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 461 void krb5_free_unparsed_name(krb5_context context, char *val)
 462 {
 463         SAFE_FREE(val);
 464 }
 465 #endif
 466
 467 /**************************************************************
 468  krb5_parse_name that returns a UNIX charset name. Must
 469  be freed with talloc_free() call.
 470 **************************************************************/
 471
 472 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 473                                       krb5_context context,
 474                                       krb5_const_principal principal,
 475                                       char **unix_name)
 476 {
 477         krb5_error_code ret;
 478         char *utf8_name;
 479         size_t converted_size;
 480
 481         *unix_name = NULL;
 482         ret = krb5_unparse_name(context, principal, &utf8_name);
 483         if (ret) {
 484                 return ret;
 485         }
 486
 487         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 488                 krb5_free_unparsed_name(context, utf8_name);
 489                 return ENOMEM;
 490         }
 491         krb5_free_unparsed_name(context, utf8_name);
 492         return 0;
 493 }
 494
 495 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
 496                                             const char *name,
 497                                             krb5_principal *principal)
 498 {
 499         /* we are cheating here because parse_name will in fact set the realm.
 500          * We don't care as the only caller of smb_krb5_parse_name_norealm
 501          * ignores the realm anyway when calling
 502          * smb_krb5_principal_compare_any_realm later - Guenther */
 503
 504         return smb_krb5_parse_name(context, name, principal);
 505 }
 506
 507 bool smb_krb5_principal_compare_any_realm(krb5_context context,
 508                                           krb5_const_principal princ1,
 509                                           krb5_const_principal princ2)
 510 {
 511         return krb5_principal_compare_any_realm(context, princ1, princ2);
 512 }
 513
 514 /*
 515   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 516 */
 517 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 518                                        krb5_auth_context *auth_context,
 519                                        const krb5_flags ap_req_options,
 520                                        const char *principal,
 521                                        krb5_ccache ccache,
 522                                        krb5_data *outbuf,
 523                                        time_t *expire_time,
 524                                        const char *impersonate_princ_s)
 525 {
 526         krb5_error_code           retval;
 527         krb5_principal    server;
 528         krb5_principal impersonate_princ = NULL;
 529         krb5_creds              * credsp;
 530         krb5_creds                creds;
 531         krb5_data in_data;
 532         bool creds_ready = false;
 533         int i = 0, maxtries = 3;
 534
 535         ZERO_STRUCT(in_data);
 536
 537         retval = smb_krb5_parse_name(context, principal, &server);
 538         if (retval) {
 539                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 540                 return retval;
 541         }
 542
 543         if (impersonate_princ_s) {
 544                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 545                                              &impersonate_princ);
 546                 if (retval) {
 547                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 548                         goto cleanup_princ;
 549                 }
 550         }
 551
 552         /* obtain ticket & session key */
 553         ZERO_STRUCT(creds);
 554         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 555                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 556                          error_message(retval)));
 557                 goto cleanup_princ;
 558         }
 559
 560         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 561                 /* This can commonly fail on smbd startup with no ticket in the cache.
 562                  * Report at higher level than 1. */
 563                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 564                          error_message(retval)));
 565                 goto cleanup_creds;
 566         }
 567
 568         while (!creds_ready && (i < maxtries)) {
 569
 570                 if ((retval = smb_krb5_get_credentials(context, ccache,
 571                                                        creds.client,
 572                                                        creds.server,
 573                                                        impersonate_princ,
 574                                                        &credsp))) {
 575                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 576                                 principal, error_message(retval)));
 577                         goto cleanup_creds;
 578                 }
 579
 580                 /* cope with ticket being in the future due to clock skew */
 581                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 582                         time_t t = time(NULL);
 583                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 584                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 585                         krb5_set_real_time(context, t + time_offset + 1, 0);
 586                 }
 587
 588                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 589                         creds_ready = true;
 590                 }
 591
 592                 i++;
 593         }
 594
 595         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 596                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 597                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 598                   (unsigned)credsp->times.endtime));
 599
 600         if (expire_time) {
 601                 *expire_time = (time_t)credsp->times.endtime;
 602         }
 603
 604         /* Allocate the auth_context. */
 605         retval = setup_auth_context(context, auth_context);
 606         if (retval) {
 607                 DEBUG(1,("setup_auth_context failed (%s)\n",
 608                         error_message(retval)));
 609                 goto cleanup_creds;
 610         }
 611
 612 #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)
 613         {
 614                 uint32_t gss_flags = 0;
 615
 616                 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 617                         /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 618                          as part of the kerberos exchange. */
 619
 620                         DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 621
 622                         retval = krb5_auth_con_setuseruserkey(context,
 623                                         *auth_context,
 624                                         &credsp->keyblock );
 625                         if (retval) {
 626                                 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 627                                         error_message(retval)));
 628                                 goto cleanup_creds;
 629                         }
 630
 631                         /* Must use a subkey for forwarded tickets. */
 632                         retval = krb5_auth_con_setflags(context,
 633                                 *auth_context,
 634                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 635                         if (retval) {
 636                                 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 637                                         error_message(retval)));
 638                                 goto cleanup_creds;
 639                         }
 640
 641                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 642                                 *auth_context,  /* Authentication context [in] */
 643                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 644                                 credsp->client, /* Client principal for the tgt [in] */
 645                                 credsp->server, /* Server principal for the tgt [in] */
 646                                 ccache,         /* Credential cache to use for storage [in] */
 647                                 1,              /* Turn on for "Forwardable ticket" [in] */
 648                                 &in_data );     /* Resulting response [out] */
 649
 650                         if (retval) {
 651                                 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 652                                            error_message( retval ) ) );
 653
 654                                 /*
 655                                  * This is not fatal. Delete the *auth_context and continue
 656                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
 657                                  */
 658
 659                                 if (in_data.data) {
 660                                         free( in_data.data );
 661                                         in_data.data = NULL;
 662                                         in_data.length = 0;
 663                                 }
 664                                 krb5_auth_con_free(context, *auth_context);
 665                                 *auth_context = NULL;
 666                                 retval = setup_auth_context(context, auth_context);
 667                                 if (retval) {
 668                                         DEBUG(1,("setup_auth_context failed (%s)\n",
 669                                                 error_message(retval)));
 670                                         goto cleanup_creds;
 671                                 }
 672                         } else {
 673                                 /* We got a delegated ticket. */
 674                                 gss_flags |= GSS_C_DELEG_FLAG;
 675                         }
 676                 }
 677
 678                 /* Frees and reallocates in_data into a GSS checksum blob. */
 679                 retval = create_gss_checksum(&in_data, gss_flags);
 680                 if (retval) {
 681                         goto cleanup_data;
 682                 }
 683
 684                 /* We always want GSS-checksum types. */
 685                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 686                 if (retval) {
 687                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 688                                 error_message(retval)));
 689                         goto cleanup_data;
 690                 }
 691         }
 692 #endif
 693
 694         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 695                                       &in_data, credsp, outbuf);
 696         if (retval) {
 697                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 698                          error_message(retval)));
 699         }
 700
 701 #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)
 702 cleanup_data:
 703 #endif
 704
 705         if (in_data.data) {
 706                 free( in_data.data );
 707                 in_data.length = 0;
 708         }
 709
 710         krb5_free_creds(context, credsp);
 711
 712 cleanup_creds:
 713         krb5_free_cred_contents(context, &creds);
 714
 715 cleanup_princ:
 716         krb5_free_principal(context, server);
 717         if (impersonate_princ) {
 718                 krb5_free_principal(context, impersonate_princ);
 719         }
 720
 721         return retval;
 722 }
 723
 724 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 725 {
 726 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 727         if (pdata->data) {
 728                 krb5_free_data_contents(context, pdata);
 729         }
 730 #elif defined(HAVE_KRB5_DATA_FREE)
 731         krb5_data_free(context, pdata);
 732 #else
 733         SAFE_FREE(pdata->data);
 734 #endif
 735 }
 736
 737 /*
 738  * @brief copy a buffer into a krb5_data struct
 739  *
 740  * @param[in] p                 The krb5_data
 741  * @param[in] data              The data to copy
 742  * @param[in] length            The length of the data to copy
 743  * @return krb5_error_code
 744  *
 745  * Caller has to free krb5_data with kerberos_free_data_contents().
 746  */
 747
 748 krb5_error_code krb5_copy_data_contents(krb5_data *p,
 749                                         const void *data,
 750                                         size_t len)
 751 {
 752 #if defined(HAVE_KRB5_DATA_COPY)
 753         return krb5_data_copy(p, data, len);
 754 #else
 755         if (len) {
 756                 p->data = malloc(len);
 757                 if (p->data == NULL) {
 758                         return ENOMEM;
 759                 }
 760                 memmove(p->data, data, len);
 761         } else {
 762                 p->data = NULL;
 763         }
 764         p->length = len;
 765         p->magic = KV5M_DATA;
 766         return 0;
 767 #endif
 768 }
 769
 770 /*
 771   get a kerberos5 ticket for the given service
 772 */
 773 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 774                         const char *principal, time_t time_offset,
 775                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 776                         uint32_t extra_ap_opts, const char *ccname,
 777                         time_t *tgs_expire,
 778                         const char *impersonate_princ_s)
 779
 780 {
 781         krb5_error_code retval;
 782         krb5_data packet;
 783         krb5_context context = NULL;
 784         krb5_ccache ccdef = NULL;
 785         krb5_auth_context auth_context = NULL;
 786         krb5_enctype enc_types[] = {
 787 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
 788                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
 789 #endif
 790 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
 791                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
 792 #endif
 793                 ENCTYPE_ARCFOUR_HMAC,
 794                 ENCTYPE_DES_CBC_MD5,
 795                 ENCTYPE_DES_CBC_CRC,
 796                 ENCTYPE_NULL};
 797
 798         initialize_krb5_error_table();
 799         retval = krb5_init_context(&context);
 800         if (retval) {
 801                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 802                          error_message(retval)));
 803                 goto failed;
 804         }
 805
 806         if (time_offset != 0) {
 807                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 808         }
 809
 810         if ((retval = krb5_cc_resolve(context, ccname ?
 811                         ccname : krb5_cc_default_name(context), &ccdef))) {
 812                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 813                          error_message(retval)));
 814                 goto failed;
 815         }
 816
 817         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 818                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 819                          error_message(retval)));
 820                 goto failed;
 821         }
 822
 823         retval = ads_krb5_mk_req(context, &auth_context,
 824                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 825                                 principal, ccdef, &packet,
 826                                 tgs_expire, impersonate_princ_s);
 827         if (retval) {
 828                 goto failed;
 829         }
 830
 831         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 832                                  session_key_krb5, false);
 833
 834         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 835
 836         kerberos_free_data_contents(context, &packet);
 837
 838 failed:
 839
 840         if (context) {
 841                 if (ccdef)
 842                         krb5_cc_close(context, ccdef);
 843                 if (auth_context)
 844                         krb5_auth_con_free(context, auth_context);
 845                 krb5_free_context(context);
 846         }
 847
 848         return retval;
 849 }
 850
 851 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 852                               krb5_context context,
 853                               krb5_auth_context auth_context,
 854                               DATA_BLOB *session_key, bool remote)
 855 {
 856         krb5_keyblock *skey = NULL;
 857         krb5_error_code err = 0;
 858         bool ret = false;
 859
 860         if (remote) {
 861                 err = krb5_auth_con_getremotesubkey(context,
 862                                                     auth_context, &skey);
 863         } else {
 864                 err = krb5_auth_con_getlocalsubkey(context,
 865                                                    auth_context, &skey);
 866         }
 867
 868         if (err || skey == NULL) {
 869                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 870                 goto done;
 871         }
 872
 873         DEBUG(10, ("Got KRB5 session key of length %d\n",
 874                    (int)KRB5_KEY_LENGTH(skey)));
 875
 876         *session_key = data_blob_talloc(mem_ctx,
 877                                          KRB5_KEY_DATA(skey),
 878                                          KRB5_KEY_LENGTH(skey));
 879         dump_data_pw("KRB5 Session Key:\n",
 880                      session_key->data,
 881                      session_key->length);
 882
 883         ret = true;
 884
 885 done:
 886         if (skey) {
 887                 krb5_free_keyblock(context, skey);
 888         }
 889
 890         return ret;
 891 }
 892
 893
 894 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 895  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 896
 897  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 898 {
 899         static krb5_data kdata;
 900
 901         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 902         kdata.length = strlen((const char *)kdata.data);
 903         return &kdata;
 904 }
 905 #endif
 906
 907 /*
 908  * @brief Get talloced string component of a principal
 909  *
 910  * @param[in] mem_ctx           The TALLOC_CTX
 911  * @param[in] context           The krb5_context
 912  * @param[in] principal         The principal
 913  * @param[in] component         The component
 914  * @return string component
 915  *
 916  * Caller must talloc_free if the return value is not NULL.
 917  *
 918  */
 919
 920 /* caller has to free returned string with free() */
 921 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
 922                                          krb5_context context,
 923                                          krb5_const_principal principal,
 924                                          unsigned int component)
 925 {
 926 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
 927         return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
 928 #else
 929         krb5_data *data;
 930
 931         if (component >= krb5_princ_size(context, principal)) {
 932                 return NULL;
 933         }
 934
 935         data = krb5_princ_component(context, principal, component);
 936         if (data == NULL) {
 937                 return NULL;
 938         }
 939
 940         return talloc_strndup(mem_ctx, data->data, data->length);
 941 #endif
 942 }
 943
 944 /* Prototypes */
 945
 946  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
 947                                        const char *client_string,       /* gd@BER.SUSE.DE */
 948                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
 949                                        time_t *expire_time)
 950 {
 951         krb5_error_code ret;
 952         krb5_context context = NULL;
 953         krb5_ccache ccache = NULL;
 954         krb5_principal client = NULL;
 955         krb5_creds creds, creds_in;
 956
 957         ZERO_STRUCT(creds);
 958         ZERO_STRUCT(creds_in);
 959
 960         initialize_krb5_error_table();
 961         ret = krb5_init_context(&context);
 962         if (ret) {
 963                 goto done;
 964         }
 965
 966         if (!ccache_string) {
 967                 ccache_string = krb5_cc_default_name(context);
 968         }
 969
 970         if (!ccache_string) {
 971                 ret = EINVAL;
 972                 goto done;
 973         }
 974
 975         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
 976
 977         /* FIXME: we should not fall back to defaults */
 978         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
 979         if (ret) {
 980                 goto done;
 981         }
 982
 983         if (client_string) {
 984                 ret = smb_krb5_parse_name(context, client_string, &client);
 985                 if (ret) {
 986                         goto done;
 987                 }
 988         } else {
 989                 ret = krb5_cc_get_principal(context, ccache, &client);
 990                 if (ret) {
 991                         goto done;
 992                 }
 993         }
 994
 995         ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
 996         if (ret) {
 997                 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
 998                 goto done;
 999         }
1000
1001         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1002         ret = krb5_cc_initialize(context, ccache, client);
1003         if (ret) {
1004                 goto done;
1005         }
1006
1007         ret = krb5_cc_store_cred(context, ccache, &creds);
1008
1009         if (expire_time) {
1010                 *expire_time = (time_t) creds.times.endtime;
1011         }
1012
1013 done:
1014         krb5_free_cred_contents(context, &creds_in);
1015         krb5_free_cred_contents(context, &creds);
1016
1017         if (client) {
1018                 krb5_free_principal(context, client);
1019         }
1020         if (ccache) {
1021                 krb5_cc_close(context, ccache);
1022         }
1023         if (context) {
1024                 krb5_free_context(context);
1025         }
1026
1027         return ret;
1028 }
1029
1030  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1031 {
1032         krb5_error_code ret = 0;
1033         if (addr == NULL) {
1034                 return ret;
1035         }
1036 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1037         krb5_free_addresses(context, addr->addrs);
1038 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1039         ret = krb5_free_addresses(context, addr->addrs);
1040         SAFE_FREE(addr->addrs);
1041 #endif
1042         SAFE_FREE(addr);
1043         addr = NULL;
1044         return ret;
1045 }
1046
1047 #define MAX_NETBIOSNAME_LEN 16
1048  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
1049                                                    const char *netbios_name)
1050 {
1051         krb5_error_code ret = 0;
1052         char buf[MAX_NETBIOSNAME_LEN];
1053         int len;
1054 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1055         krb5_address **addrs = NULL;
1056 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1057         krb5_addresses *addrs = NULL;
1058 #endif
1059
1060         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1061         if (*kerb_addr == NULL) {
1062                 return ENOMEM;
1063         }
1064
1065         /* temporarily duplicate put_name() code here to avoid dependency
1066          * issues for a 5 lines function */
1067         len = strlen(netbios_name);
1068         memcpy(buf, netbios_name,
1069                 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
1070         if (len < MAX_NETBIOSNAME_LEN - 1) {
1071                 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
1072         }
1073         buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
1074
1075 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1076         {
1077                 int num_addr = 2;
1078
1079                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1080                 if (addrs == NULL) {
1081                         SAFE_FREE(*kerb_addr);
1082                         return ENOMEM;
1083                 }
1084
1085                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1086
1087                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1088                 if (addrs[0] == NULL) {
1089                         SAFE_FREE(addrs);
1090                         SAFE_FREE(*kerb_addr);
1091                         return ENOMEM;
1092                 }
1093
1094                 addrs[0]->magic = KV5M_ADDRESS;
1095                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1096                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1097                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1098                 if (addrs[0]->contents == NULL) {
1099                         SAFE_FREE(addrs[0]);
1100                         SAFE_FREE(addrs);
1101                         SAFE_FREE(*kerb_addr);
1102                         return ENOMEM;
1103                 }
1104
1105                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1106
1107                 addrs[1] = NULL;
1108         }
1109 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1110         {
1111                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1112                 if (addrs == NULL) {
1113                         SAFE_FREE(*kerb_addr);
1114                         return ENOMEM;
1115                 }
1116
1117                 memset(addrs, 0, sizeof(krb5_addresses));
1118
1119                 addrs->len = 1;
1120                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1121                 if (addrs->val == NULL) {
1122                         SAFE_FREE(addrs);
1123                         SAFE_FREE(kerb_addr);
1124                         return ENOMEM;
1125                 }
1126
1127                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1128                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1129                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1130                 if (addrs->val[0].address.data == NULL) {
1131                         SAFE_FREE(addrs->val);
1132                         SAFE_FREE(addrs);
1133                         SAFE_FREE(*kerb_addr);
1134                         return ENOMEM;
1135                 }
1136
1137                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1138         }
1139 #else
1140 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1141 #endif
1142         (*kerb_addr)->addrs = addrs;
1143
1144         return ret;
1145 }
1146
1147  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1148 {
1149 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1150         krb5_free_error_contents(context, krberror);
1151 #else /* MIT */
1152         krb5_free_error(context, krberror);
1153 #endif
1154 }
1155
1156  krb5_error_code handle_krberror_packet(krb5_context context,
1157                                         krb5_data *packet)
1158 {
1159         krb5_error_code ret;
1160         bool got_error_code = false;
1161
1162         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1163
1164 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1165         {
1166                 krb5_error krberror;
1167
1168                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1169                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1170                                 error_message(ret)));
1171                         return ret;
1172                 }
1173
1174                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1175                         ret = (krb5_error_code) krberror.error_code;
1176                         got_error_code = true;
1177                 }
1178
1179                 smb_krb5_free_error(context, &krberror);
1180         }
1181 #else /* MIT */
1182         {
1183                 krb5_error *krberror;
1184
1185                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1186                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1187                                 error_message(ret)));
1188                         return ret;
1189                 }
1190
1191                 if (krberror->e_data.data == NULL) {
1192 #if defined(ERROR_TABLE_BASE_krb5)
1193                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1194 #else
1195                         ret = (krb5_error_code)krberror->error;
1196 #endif
1197                         got_error_code = true;
1198                 }
1199                 smb_krb5_free_error(context, krberror);
1200         }
1201 #endif
1202         if (got_error_code) {
1203                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1204                         error_message(ret), ret));
1205         }
1206         return ret;
1207 }
1208
1209 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1210                                             krb5_get_init_creds_opt **opt)
1211 {
1212         /* Heimdal or modern MIT version */
1213         return krb5_get_init_creds_opt_alloc(context, opt);
1214 }
1215
1216 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1217                                 krb5_get_init_creds_opt *opt)
1218 {
1219         /* Modern MIT or Heimdal version */
1220         krb5_get_init_creds_opt_free(context, opt);
1221 }
1222
1223 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1224 {
1225         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1226 }
1227
1228 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1229                                         krb5_keytab_entry *kt_entry)
1230 {
1231 /* Try krb5_free_keytab_entry_contents first, since
1232  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1233  * krb5_kt_free_entry but only has a prototype for the first, while the
1234  * second is considered private.
1235  */
1236 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1237         return krb5_free_keytab_entry_contents(context, kt_entry);
1238 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1239         return krb5_kt_free_entry(context, kt_entry);
1240 #else
1241 #error UNKNOWN_KT_FREE_FUNCTION
1242 #endif
1243 }
1244
1245
1246 /* caller needs to free etype_s */
1247 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1248                                            krb5_enctype enctype,
1249                                            char **etype_s)
1250 {
1251 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1252         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1253 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1254         char buf[256];
1255         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1256         if (ret) {
1257                 return ret;
1258         }
1259         *etype_s = SMB_STRDUP(buf);
1260         if (!*etype_s) {
1261                 return ENOMEM;
1262         }
1263         return ret;
1264 #else
1265 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1266 #endif
1267 }
1268
1269 /**********************************************************************
1270  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1271  * allows to process non-default keytab names.
1272  * @param context krb5_context
1273  * @param keytab_name_req string
1274  * @param write_access bool if writable keytab is required
1275  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1276  * @return krb5_error_code
1277 **********************************************************************/
1278
1279 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1280 #ifndef MAX_KEYTAB_NAME_LEN
1281 #define MAX_KEYTAB_NAME_LEN 1100
1282 #endif
1283
1284 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1285                                      const char *keytab_name_req,
1286                                      bool write_access,
1287                                      krb5_keytab *keytab)
1288 {
1289         krb5_error_code ret = 0;
1290         TALLOC_CTX *mem_ctx;
1291         char keytab_string[MAX_KEYTAB_NAME_LEN];
1292         char *kt_str = NULL;
1293         bool found_valid_name = false;
1294         const char *pragma = "FILE";
1295         const char *tmp = NULL;
1296
1297         if (!write_access && !keytab_name_req) {
1298                 /* caller just wants to read the default keytab readonly, so be it */
1299                 return krb5_kt_default(context, keytab);
1300         }
1301
1302         mem_ctx = talloc_init("smb_krb5_open_keytab");
1303         if (!mem_ctx) {
1304                 return ENOMEM;
1305         }
1306
1307 #ifdef HAVE_WRFILE_KEYTAB
1308         if (write_access) {
1309                 pragma = "WRFILE";
1310         }
1311 #endif
1312
1313         if (keytab_name_req) {
1314
1315                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1316                         ret = KRB5_CONFIG_NOTENUFSPACE;
1317                         goto out;
1318                 }
1319
1320                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1321                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1322                         tmp = keytab_name_req;
1323                         goto resolve;
1324                 }
1325
1326                 if (keytab_name_req[0] != '/') {
1327                         ret = KRB5_KT_BADNAME;
1328                         goto out;
1329                 }
1330
1331                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1332                 if (!tmp) {
1333                         ret = ENOMEM;
1334                         goto out;
1335                 }
1336
1337                 goto resolve;
1338         }
1339
1340         /* we need to handle more complex keytab_strings, like:
1341          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1342
1343         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1344         if (ret) {
1345                 goto out;
1346         }
1347
1348         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1349
1350         tmp = talloc_strdup(mem_ctx, keytab_string);
1351         if (!tmp) {
1352                 ret = ENOMEM;
1353                 goto out;
1354         }
1355
1356         if (strncmp(tmp, "ANY:", 4) == 0) {
1357                 tmp += 4;
1358         }
1359
1360         memset(&keytab_string, '\0', sizeof(keytab_string));
1361
1362         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1363                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1364                         found_valid_name = true;
1365                         tmp = kt_str;
1366                         tmp += 7;
1367                 }
1368
1369                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1370                         found_valid_name = true;
1371                         tmp = kt_str;
1372                         tmp += 5;
1373                 }
1374
1375                 if (tmp[0] == '/') {
1376                         /* Treat as a FILE: keytab definition. */
1377                         found_valid_name = true;
1378                 }
1379
1380                 if (found_valid_name) {
1381                         if (tmp[0] != '/') {
1382                                 ret = KRB5_KT_BADNAME;
1383                                 goto out;
1384                         }
1385
1386                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1387                         if (!tmp) {
1388                                 ret = ENOMEM;
1389                                 goto out;
1390                         }
1391                         break;
1392                 }
1393         }
1394
1395         if (!found_valid_name) {
1396                 ret = KRB5_KT_UNKNOWN_TYPE;
1397                 goto out;
1398         }
1399
1400  resolve:
1401         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1402         ret = krb5_kt_resolve(context, tmp, keytab);
1403
1404  out:
1405         TALLOC_FREE(mem_ctx);
1406         return ret;
1407 }
1408
1409 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1410                                      krb5_context context,
1411                                      krb5_keytab keytab,
1412                                      const char **keytab_name)
1413 {
1414         char keytab_string[MAX_KEYTAB_NAME_LEN];
1415         krb5_error_code ret = 0;
1416
1417         ret = krb5_kt_get_name(context, keytab,
1418                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1419         if (ret) {
1420                 return ret;
1421         }
1422
1423         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1424         if (!*keytab_name) {
1425                 return ENOMEM;
1426         }
1427
1428         return ret;
1429 }
1430
1431 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1432     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1433     defined(HAVE_KRB5_GET_CREDS)
1434 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1435                                                              krb5_ccache ccache,
1436                                                              krb5_principal me,
1437                                                              krb5_principal server,
1438                                                              krb5_principal impersonate_princ,
1439                                                              krb5_creds **out_creds)
1440 {
1441         krb5_error_code ret;
1442         krb5_get_creds_opt opt;
1443
1444         ret = krb5_get_creds_opt_alloc(context, &opt);
1445         if (ret) {
1446                 goto done;
1447         }
1448         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1449
1450         if (impersonate_princ) {
1451                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1452                                                          impersonate_princ);
1453                 if (ret) {
1454                         goto done;
1455                 }
1456         }
1457
1458         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1459         if (ret) {
1460                 goto done;
1461         }
1462
1463  done:
1464         if (opt) {
1465                 krb5_get_creds_opt_free(context, opt);
1466         }
1467         return ret;
1468 }
1469 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1470
1471 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1472
1473 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1474 krb5_error_code KRB5_CALLCONV
1475 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1476                               krb5_ccache ccache, krb5_creds *in_creds,
1477                               krb5_data *subject_cert,
1478                               krb5_creds **out_creds);
1479 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1480
1481 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1482                                                          krb5_ccache ccache,
1483                                                          krb5_principal me,
1484                                                          krb5_principal server,
1485                                                          krb5_principal impersonate_princ,
1486                                                          krb5_creds **out_creds)
1487 {
1488         krb5_error_code ret;
1489         krb5_creds in_creds;
1490
1491         ZERO_STRUCT(in_creds);
1492
1493         if (impersonate_princ) {
1494
1495                 in_creds.server = me;
1496                 in_creds.client = impersonate_princ;
1497
1498                 ret = krb5_get_credentials_for_user(context,
1499                                                     0, /* krb5_flags options */
1500                                                     ccache,
1501                                                     &in_creds,
1502                                                     NULL, /* krb5_data *subject_cert */
1503                                                     out_creds);
1504         } else {
1505                 in_creds.client = me;
1506                 in_creds.server = server;
1507
1508                 ret = krb5_get_credentials(context, 0, ccache,
1509                                            &in_creds, out_creds);
1510         }
1511
1512         return ret;
1513 }
1514 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1515
1516 /*
1517  * smb_krb5_get_credentials
1518  *
1519  * @brief Get krb5 credentials for a server
1520  *
1521  * @param[in] context           An initialized krb5_context
1522  * @param[in] ccache            An initialized krb5_ccache
1523  * @param[in] me                The krb5_principal of the caller
1524  * @param[in] server            The krb5_principal of the requested service
1525  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1526  * @param[out] out_creds        The returned krb5_creds structure
1527  * @return krb5_error_code
1528  *
1529  */
1530 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1531                                          krb5_ccache ccache,
1532                                          krb5_principal me,
1533                                          krb5_principal server,
1534                                          krb5_principal impersonate_princ,
1535                                          krb5_creds **out_creds)
1536 {
1537         krb5_error_code ret;
1538         krb5_creds *creds = NULL;
1539
1540         if (out_creds != NULL) {
1541                 *out_creds = NULL;
1542         }
1543
1544         if (impersonate_princ) {
1545 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1546                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1547 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1548                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1549 #else
1550                 ret = ENOTSUP;
1551 #endif
1552         } else {
1553                 krb5_creds in_creds;
1554
1555                 ZERO_STRUCT(in_creds);
1556
1557                 in_creds.client = me;
1558                 in_creds.server = server;
1559
1560                 ret = krb5_get_credentials(context, 0, ccache,
1561                                            &in_creds, &creds);
1562         }
1563         if (ret) {
1564                 goto done;
1565         }
1566
1567         if (out_creds) {
1568                 *out_creds = creds;
1569         }
1570
1571  done:
1572         if (creds && ret) {
1573                 krb5_free_creds(context, creds);
1574         }
1575
1576         return ret;
1577 }
1578
1579 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1580                                                 krb5_enctype enctype,
1581                                                 const void *data,
1582                                                 size_t length,
1583                                                 krb5_keyblock *key)
1584 {
1585 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1586         return krb5_keyblock_init(context, enctype, data, length, key);
1587 #else
1588         memset(key, 0, sizeof(krb5_keyblock));
1589         KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1590         if (NULL == KRB5_KEY_DATA(key)) {
1591                 return ENOMEM;
1592         }
1593         memcpy(KRB5_KEY_DATA(key), data, length);
1594         KRB5_KEY_LENGTH(key) = length;
1595         KRB5_KEY_TYPE(key) = enctype;
1596         return 0;
1597 #endif
1598 }
1599
1600 /*
1601   simulate a kinit, putting the tgt in the given credentials cache.
1602   Orignally by remus@snapserver.com
1603
1604   This version is built to use a keyblock, rather than needing the
1605   original password.
1606
1607   The impersonate_principal is the principal if NULL, or the principal
1608   to impersonate
1609
1610   The target_service defaults to the krbtgt if NULL, but could be
1611    kpasswd/realm or the local service (if we are doing s4u2self)
1612 */
1613 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1614                                            krb5_principal principal,
1615                                            krb5_keyblock *keyblock,
1616                                            const char *target_service,
1617                                            krb5_get_init_creds_opt *krb_options,
1618                                            time_t *expire_time,
1619                                            time_t *kdc_time)
1620 {
1621         krb5_error_code code = 0;
1622         krb5_creds my_creds;
1623
1624 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1625         code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1626                                             keyblock, 0, target_service,
1627                                             krb_options);
1628 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1629 {
1630 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1631         char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1632         krb5_keytab_entry entry;
1633         krb5_keytab keytab;
1634         mode_t mask;
1635
1636         memset(&entry, 0, sizeof(entry));
1637         entry.principal = principal;
1638         *(KRB5_KT_KEY(&entry)) = *keyblock;
1639
1640         memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1641         mask = umask(S_IRWXO | S_IRWXG);
1642         mktemp(tmp_name);
1643         umask(mask);
1644         if (tmp_name[0] == 0) {
1645                 return KRB5_KT_BADNAME;
1646         }
1647         code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1648         if (code) {
1649                 return code;
1650         }
1651
1652         code = krb5_kt_add_entry(ctx, keytab, &entry);
1653         if (code) {
1654                 (void)krb5_kt_close(ctx, keytab);
1655                 goto done;
1656         }
1657
1658         code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1659                                           keytab, 0, target_service,
1660                                           krb_options);
1661         (void)krb5_kt_close(ctx, keytab);
1662 }
1663 #else
1664 #error krb5_get_init_creds_keyblock not available!
1665 #endif
1666         if (code) {
1667                 return code;
1668         }
1669
1670         code = krb5_cc_initialize(ctx, cc, principal);
1671         if (code) {
1672                 goto done;
1673         }
1674
1675         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1676         if (code) {
1677                 goto done;
1678         }
1679
1680         if (expire_time) {
1681                 *expire_time = (time_t) my_creds.times.endtime;
1682         }
1683
1684         if (kdc_time) {
1685                 *kdc_time = (time_t) my_creds.times.starttime;
1686         }
1687
1688         code = 0;
1689 done:
1690         krb5_free_cred_contents(ctx, &my_creds);
1691         return code;
1692 }
1693
1694 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
1695                                            krb5_principal principal,
1696                                            const char *password,
1697                                            const char *target_service,
1698                                            krb5_get_init_creds_opt *krb_options,
1699                                            time_t *expire_time,
1700                                            time_t *kdc_time)
1701 {
1702         krb5_error_code code = 0;
1703         krb5_creds my_creds;
1704
1705         code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1706                                             password, NULL, NULL, 0,
1707                                             target_service, krb_options);
1708         if (code) {
1709                 return code;
1710         }
1711
1712         code = krb5_cc_initialize(ctx, cc, principal);
1713         if (code) {
1714                 goto done;
1715         }
1716
1717         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1718         if (code) {
1719                 goto done;
1720         }
1721
1722         if (expire_time) {
1723                 *expire_time = (time_t) my_creds.times.endtime;
1724         }
1725
1726         if (kdc_time) {
1727                 *kdc_time = (time_t) my_creds.times.starttime;
1728         }
1729
1730         code = 0;
1731 done:
1732         krb5_free_cred_contents(ctx, &my_creds);
1733         return code;
1734 }
1735
1736 #ifdef SAMBA4_USES_HEIMDAL
1737 /*
1738   simulate a kinit, putting the tgt in the given credentials cache.
1739   Orignally by remus@snapserver.com
1740
1741   The impersonate_principal is the principal
1742
1743   The self_service, should be the local service (for S4U2Self if
1744   impersonate_principal is given).
1745
1746   The target_service defaults to the krbtgt if NULL, but could be
1747   kpasswd/realm or a remote service (for S4U2Proxy)
1748
1749 */
1750 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
1751                                         krb5_ccache store_cc,
1752                                         krb5_principal init_principal,
1753                                         const char *init_password,
1754                                         krb5_principal impersonate_principal,
1755                                         const char *self_service,
1756                                         const char *target_service,
1757                                         krb5_get_init_creds_opt *krb_options,
1758                                         time_t *expire_time,
1759                                         time_t *kdc_time)
1760 {
1761         krb5_error_code code = 0;
1762         krb5_get_creds_opt options;
1763         krb5_principal store_principal;
1764         krb5_creds store_creds;
1765         krb5_creds *s4u2self_creds;
1766         Ticket s4u2self_ticket;
1767         size_t s4u2self_ticketlen;
1768         krb5_creds *s4u2proxy_creds;
1769         krb5_principal self_princ;
1770         bool s4u2proxy;
1771         krb5_principal target_princ;
1772         krb5_ccache tmp_cc;
1773         const char *self_realm;
1774         krb5_principal blacklist_principal = NULL;
1775         krb5_principal whitelist_principal = NULL;
1776
1777         code = krb5_get_init_creds_password(ctx, &store_creds,
1778                                             init_principal,
1779                                             init_password,
1780                                             NULL, NULL,
1781                                             0,
1782                                             NULL,
1783                                             krb_options);
1784         if (code != 0) {
1785                 return code;
1786         }
1787
1788         store_principal = init_principal;
1789
1790         /*
1791          * We are trying S4U2Self now:
1792          *
1793          * As we do not want to expose our TGT in the
1794          * krb5_ccache, which is also holds the impersonated creds.
1795          *
1796          * Some low level krb5/gssapi function might use the TGT
1797          * identity and let the client act as our machine account.
1798          *
1799          * We need to avoid that and use a temporary krb5_ccache
1800          * in order to pass our TGT to the krb5_get_creds() function.
1801          */
1802         code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1803         if (code != 0) {
1804                 krb5_free_cred_contents(ctx, &store_creds);
1805                 return code;
1806         }
1807
1808         code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1809         if (code != 0) {
1810                 krb5_cc_destroy(ctx, tmp_cc);
1811                 krb5_free_cred_contents(ctx, &store_creds);
1812                 return code;
1813         }
1814
1815         code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1816         if (code != 0) {
1817                 krb5_free_cred_contents(ctx, &store_creds);
1818                 krb5_cc_destroy(ctx, tmp_cc);
1819                 return code;
1820         }
1821
1822         /*
1823          * we need to remember the client principal of our
1824          * TGT and make sure the KDC does not return this
1825          * in the impersonated tickets. This can happen
1826          * if the KDC does not support S4U2Self and S4U2Proxy.
1827          */
1828         blacklist_principal = store_creds.client;
1829         store_creds.client = NULL;
1830         krb5_free_cred_contents(ctx, &store_creds);
1831
1832         /*
1833          * Check if we also need S4U2Proxy or if S4U2Self is
1834          * enough in order to get a ticket for the target.
1835          */
1836         if (target_service == NULL) {
1837                 s4u2proxy = false;
1838         } else if (strcmp(target_service, self_service) == 0) {
1839                 s4u2proxy = false;
1840         } else {
1841                 s4u2proxy = true;
1842         }
1843
1844         /*
1845          * For S4U2Self we need our own service principal,
1846          * which belongs to our own realm (available on
1847          * our client principal).
1848          */
1849         self_realm = krb5_principal_get_realm(ctx, init_principal);
1850
1851         code = krb5_parse_name(ctx, self_service, &self_princ);
1852         if (code != 0) {
1853                 krb5_free_principal(ctx, blacklist_principal);
1854                 krb5_cc_destroy(ctx, tmp_cc);
1855                 return code;
1856         }
1857
1858         code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1859         if (code != 0) {
1860                 krb5_free_principal(ctx, blacklist_principal);
1861                 krb5_free_principal(ctx, self_princ);
1862                 krb5_cc_destroy(ctx, tmp_cc);
1863                 return code;
1864         }
1865
1866         code = krb5_get_creds_opt_alloc(ctx, &options);
1867         if (code != 0) {
1868                 krb5_free_principal(ctx, blacklist_principal);
1869                 krb5_free_principal(ctx, self_princ);
1870                 krb5_cc_destroy(ctx, tmp_cc);
1871                 return code;
1872         }
1873
1874         if (s4u2proxy) {
1875                 /*
1876                  * If we want S4U2Proxy, we need the forwardable flag
1877                  * on the S4U2Self ticket.
1878                  */
1879                 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1880         }
1881
1882         code = krb5_get_creds_opt_set_impersonate(ctx, options,
1883                                                   impersonate_principal);
1884         if (code != 0) {
1885                 krb5_get_creds_opt_free(ctx, options);
1886                 krb5_free_principal(ctx, blacklist_principal);
1887                 krb5_free_principal(ctx, self_princ);
1888                 krb5_cc_destroy(ctx, tmp_cc);
1889                 return code;
1890         }
1891
1892         code = krb5_get_creds(ctx, options, tmp_cc,
1893                               self_princ, &s4u2self_creds);
1894         krb5_get_creds_opt_free(ctx, options);
1895         krb5_free_principal(ctx, self_princ);
1896         if (code != 0) {
1897                 krb5_free_principal(ctx, blacklist_principal);
1898                 krb5_cc_destroy(ctx, tmp_cc);
1899                 return code;
1900         }
1901
1902         if (!s4u2proxy) {
1903                 krb5_cc_destroy(ctx, tmp_cc);
1904
1905                 /*
1906                  * Now make sure we store the impersonated principal
1907                  * and creds instead of the TGT related stuff
1908                  * in the krb5_ccache of the caller.
1909                  */
1910                 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1911                                                 &store_creds);
1912                 krb5_free_creds(ctx, s4u2self_creds);
1913                 if (code != 0) {
1914                         return code;
1915                 }
1916
1917                 /*
1918                  * It's important to store the principal the KDC
1919                  * returned, as otherwise the caller would not find
1920                  * the S4U2Self ticket in the krb5_ccache lookup.
1921                  */
1922                 store_principal = store_creds.client;
1923                 goto store;
1924         }
1925
1926         /*
1927          * We are trying S4U2Proxy:
1928          *
1929          * We need the ticket from the S4U2Self step
1930          * and our TGT in order to get the delegated ticket.
1931          */
1932         code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1933                              s4u2self_creds->ticket.length,
1934                              &s4u2self_ticket,
1935                              &s4u2self_ticketlen);
1936         if (code != 0) {
1937                 krb5_free_creds(ctx, s4u2self_creds);
1938                 krb5_free_principal(ctx, blacklist_principal);
1939                 krb5_cc_destroy(ctx, tmp_cc);
1940                 return code;
1941         }
1942
1943         /*
1944          * we need to remember the client principal of the
1945          * S4U2Self stage and as it needs to match the one we
1946          * will get for the S4U2Proxy stage. We need this
1947          * in order to detect KDCs which does not support S4U2Proxy.
1948          */
1949         whitelist_principal = s4u2self_creds->client;
1950         s4u2self_creds->client = NULL;
1951         krb5_free_creds(ctx, s4u2self_creds);
1952
1953         /*
1954          * For S4U2Proxy we also got a target service principal,
1955          * which also belongs to our own realm (available on
1956          * our client principal).
1957          */
1958         code = krb5_parse_name(ctx, target_service, &target_princ);
1959         if (code != 0) {
1960                 free_Ticket(&s4u2self_ticket);
1961                 krb5_free_principal(ctx, whitelist_principal);
1962                 krb5_free_principal(ctx, blacklist_principal);
1963                 krb5_cc_destroy(ctx, tmp_cc);
1964                 return code;
1965         }
1966
1967         code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1968         if (code != 0) {
1969                 free_Ticket(&s4u2self_ticket);
1970                 krb5_free_principal(ctx, target_princ);
1971                 krb5_free_principal(ctx, whitelist_principal);
1972                 krb5_free_principal(ctx, blacklist_principal);
1973                 krb5_cc_destroy(ctx, tmp_cc);
1974                 return code;
1975         }
1976
1977         code = krb5_get_creds_opt_alloc(ctx, &options);
1978         if (code != 0) {
1979                 free_Ticket(&s4u2self_ticket);
1980                 krb5_free_principal(ctx, target_princ);
1981                 krb5_free_principal(ctx, whitelist_principal);
1982                 krb5_free_principal(ctx, blacklist_principal);
1983                 krb5_cc_destroy(ctx, tmp_cc);
1984                 return code;
1985         }
1986
1987         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1988         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1989
1990         code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1991         free_Ticket(&s4u2self_ticket);
1992         if (code != 0) {
1993                 krb5_get_creds_opt_free(ctx, options);
1994                 krb5_free_principal(ctx, target_princ);
1995                 krb5_free_principal(ctx, whitelist_principal);
1996                 krb5_free_principal(ctx, blacklist_principal);
1997                 krb5_cc_destroy(ctx, tmp_cc);
1998                 return code;
1999         }
2000
2001         code = krb5_get_creds(ctx, options, tmp_cc,
2002                               target_princ, &s4u2proxy_creds);
2003         krb5_get_creds_opt_free(ctx, options);
2004         krb5_free_principal(ctx, target_princ);
2005         krb5_cc_destroy(ctx, tmp_cc);
2006         if (code != 0) {
2007                 krb5_free_principal(ctx, whitelist_principal);
2008                 krb5_free_principal(ctx, blacklist_principal);
2009                 return code;
2010         }
2011
2012         /*
2013          * Now make sure we store the impersonated principal
2014          * and creds instead of the TGT related stuff
2015          * in the krb5_ccache of the caller.
2016          */
2017         code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2018                                         &store_creds);
2019         krb5_free_creds(ctx, s4u2proxy_creds);
2020         if (code != 0) {
2021                 krb5_free_principal(ctx, whitelist_principal);
2022                 krb5_free_principal(ctx, blacklist_principal);
2023                 return code;
2024         }
2025
2026         /*
2027          * It's important to store the principal the KDC
2028          * returned, as otherwise the caller would not find
2029          * the S4U2Self ticket in the krb5_ccache lookup.
2030          */
2031         store_principal = store_creds.client;
2032
2033  store:
2034         if (blacklist_principal &&
2035             krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2036                 char *sp = NULL;
2037                 char *ip = NULL;
2038
2039                 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2040                 if (code != 0) {
2041                         sp = NULL;
2042                 }
2043                 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2044                 if (code != 0) {
2045                         ip = NULL;
2046                 }
2047                 DEBUG(1, ("kerberos_kinit_password_cc: "
2048                           "KDC returned self principal[%s] while impersonating [%s]\n",
2049                           sp?sp:"<no memory>",
2050                           ip?ip:"<no memory>"));
2051
2052                 SAFE_FREE(sp);
2053                 SAFE_FREE(ip);
2054
2055                 krb5_free_principal(ctx, whitelist_principal);
2056                 krb5_free_principal(ctx, blacklist_principal);
2057                 krb5_free_cred_contents(ctx, &store_creds);
2058                 return KRB5_FWD_BAD_PRINCIPAL;
2059         }
2060         if (blacklist_principal) {
2061                 krb5_free_principal(ctx, blacklist_principal);
2062         }
2063
2064         if (whitelist_principal &&
2065             !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2066                 char *sp = NULL;
2067                 char *ep = NULL;
2068
2069                 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2070                 if (code != 0) {
2071                         sp = NULL;
2072                 }
2073                 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2074                 if (code != 0) {
2075                         ep = NULL;
2076                 }
2077                 DEBUG(1, ("kerberos_kinit_password_cc: "
2078                           "KDC returned wrong principal[%s] we expected [%s]\n",
2079                           sp?sp:"<no memory>",
2080                           ep?ep:"<no memory>"));
2081
2082                 SAFE_FREE(sp);
2083                 SAFE_FREE(ep);
2084
2085                 krb5_free_principal(ctx, whitelist_principal);
2086                 krb5_free_cred_contents(ctx, &store_creds);
2087                 return KRB5_FWD_BAD_PRINCIPAL;
2088         }
2089         if (whitelist_principal) {
2090                 krb5_free_principal(ctx, whitelist_principal);
2091         }
2092
2093         code = krb5_cc_initialize(ctx, store_cc, store_principal);
2094         if (code != 0) {
2095                 krb5_free_cred_contents(ctx, &store_creds);
2096                 return code;
2097         }
2098
2099         code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2100         if (code != 0) {
2101                 krb5_free_cred_contents(ctx, &store_creds);
2102                 return code;
2103         }
2104
2105         if (expire_time) {
2106                 *expire_time = (time_t) store_creds.times.endtime;
2107         }
2108
2109         if (kdc_time) {
2110                 *kdc_time = (time_t) store_creds.times.starttime;
2111         }
2112
2113         krb5_free_cred_contents(ctx, &store_creds);
2114
2115         return 0;
2116 }
2117 #endif
2118
2119 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2120 krb5_error_code smb_krb5_make_principal(krb5_context context,
2121                                         krb5_principal *principal,
2122                                         const char *_realm, ...)
2123 {
2124         krb5_error_code code;
2125         bool free_realm;
2126         char *realm;
2127         va_list ap;
2128
2129         if (_realm) {
2130                 realm = _realm;
2131                 free_realm = false;
2132         } else {
2133                 code = krb5_get_default_realm(context, &realm);
2134                 if (code) {
2135                         return code;
2136                 }
2137                 free_realm = true;
2138         }
2139
2140         va_start(ap, _realm);
2141         code = krb5_build_principal_alloc_va(context, principal,
2142                                              strlen(realm), realm,
2143                                              ap);
2144         va_end(ap);
2145
2146         if (free_realm) {
2147                 krb5_free_default_realm(context, realm);
2148         }
2149
2150         return code;
2151 }
2152 #endif
2153
2154 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2155 /**
2156  * @brief Get the lifetime of the initial ticket in the cache.
2157  *
2158  * @param[in]  context  The kerberos context.
2159  *
2160  * @param[in]  id       The credential cache to get the ticket lifetime.
2161  *
2162  * @param[out] t        A pointer to a time value to store the lifetime.
2163  *
2164  * @return              0 on success, a krb5_error_code on error.
2165  */
2166 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2167                                          krb5_ccache id,
2168                                          time_t *t)
2169 {
2170         krb5_cc_cursor cursor;
2171         krb5_error_code kerr;
2172         krb5_creds cred;
2173         krb5_timestamp now;
2174
2175         *t = 0;
2176
2177         kerr = krb5_timeofday(context, &now);
2178         if (kerr) {
2179                 return kerr;
2180         }
2181
2182         kerr = krb5_cc_start_seq_get(context, id, &cursor);
2183         if (kerr) {
2184                 return kerr;
2185         }
2186
2187         while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2188 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2189                 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2190 #else
2191                 if (cred.flags.b.initial) {
2192 #endif
2193                         if (now < cred.times.endtime) {
2194                                 *t = (time_t) (cred.times.endtime - now);
2195                         }
2196                         krb5_free_cred_contents(context, &cred);
2197                         break;
2198                 }
2199                 krb5_free_cred_contents(context, &cred);
2200         }
2201
2202         krb5_cc_end_seq_get(context, id, &cursor);
2203
2204         return kerr;
2205 }
2206 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2207
2208 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2209 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2210 {
2211         free_Checksum(cksum);
2212 }
2213 #endif
2214
2215 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2216                                            DATA_BLOB *pac_data,
2217                                            krb5_context context,
2218                                            const krb5_keyblock *keyblock,
2219                                            uint32_t *sig_type,
2220                                            DATA_BLOB *sig_blob)
2221 {
2222         krb5_error_code ret;
2223         krb5_checksum cksum;
2224 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2225         krb5_crypto crypto;
2226
2227
2228         ret = krb5_crypto_init(context,
2229                                keyblock,
2230                                0,
2231                                &crypto);
2232         if (ret) {
2233                 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2234                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2235                 return ret;
2236         }
2237         ret = krb5_create_checksum(context,
2238                                    crypto,
2239                                    KRB5_KU_OTHER_CKSUM,
2240                                    0,
2241                                    pac_data->data,
2242                                    pac_data->length,
2243                                    &cksum);
2244         if (ret) {
2245                 DEBUG(2, ("PAC Verification failed: %s\n",
2246                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2247         }
2248
2249         krb5_crypto_destroy(context, crypto);
2250
2251         if (ret) {
2252                 return ret;
2253         }
2254
2255         *sig_type = cksum.cksumtype;
2256         *sig_blob = data_blob_talloc(mem_ctx,
2257                                         cksum.checksum.data,
2258                                         cksum.checksum.length);
2259 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2260         krb5_data input;
2261
2262         input.data = (char *)pac_data->data;
2263         input.length = pac_data->length;
2264
2265         ret = krb5_c_make_checksum(context,
2266                                    0,
2267                                    keyblock,
2268                                    KRB5_KEYUSAGE_APP_DATA_CKSUM,
2269                                    &input,
2270                                    &cksum);
2271         if (ret) {
2272                 DEBUG(2, ("PAC Verification failed: %s\n",
2273                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2274                 return ret;
2275         }
2276
2277         *sig_type = cksum.checksum_type;
2278         *sig_blob = data_blob_talloc(mem_ctx,
2279                                         cksum.contents,
2280                                         cksum.length);
2281
2282 #else
2283 #error krb5_create_checksum or krb5_c_make_checksum not available
2284 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2285         smb_krb5_free_checksum_contents(context, &cksum);
2286
2287         return 0;
2288 }
2289
2290
2291 /*
2292  * smb_krb5_principal_get_realm
2293  *
2294  * @brief Get realm of a principal
2295  *
2296  * @param[in] context           The krb5_context
2297  * @param[in] principal         The principal
2298  * @return pointer to the realm
2299  *
2300  */
2301
2302 char *smb_krb5_principal_get_realm(krb5_context context,
2303                                    krb5_const_principal principal)
2304 {
2305 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2306         return discard_const_p(char, krb5_principal_get_realm(context, principal));
2307 #elif defined(krb5_princ_realm) /* MIT */
2308         krb5_data *realm;
2309         realm = krb5_princ_realm(context, principal);
2310         return discard_const_p(char, realm->data);
2311 #else
2312         return NULL;
2313 #endif
2314 }
2315
2316 /*
2317  * smb_krb5_principal_set_realm
2318  *
2319  * @brief Get realm of a principal
2320  *
2321  * @param[in] context           The krb5_context
2322  * @param[in] principal         The principal
2323  * @param[in] realm             The realm
2324  * @return                      0 on success, a krb5_error_code on error.
2325  *
2326  */
2327
2328 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2329                                              krb5_principal principal,
2330                                              const char *realm)
2331 {
2332 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2333         return krb5_principal_set_realm(context, principal, realm);
2334 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2335         krb5_error_code ret;
2336         krb5_data data;
2337         krb5_data *old_data;
2338
2339         old_data = krb5_princ_realm(context, principal);
2340
2341         ret = krb5_copy_data_contents(&data,
2342                                       realm,
2343                                       strlen(realm));
2344         if (ret) {
2345                 return ret;
2346         }
2347
2348         /* free realm before setting */
2349         free(old_data->data);
2350
2351         krb5_princ_set_realm(context, principal, &data);
2352
2353         return ret;
2354 #else
2355 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2356 #endif
2357 }
2358
2359
2360 /************************************************************************
2361  Routine to get the default realm from the kerberos credentials cache.
2362  Caller must free if the return value is not NULL.
2363 ************************************************************************/
2364
2365 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2366 {
2367         char *realm = NULL;
2368         krb5_context ctx = NULL;
2369         krb5_ccache cc = NULL;
2370         krb5_principal princ = NULL;
2371
2372         initialize_krb5_error_table();
2373         if (krb5_init_context(&ctx)) {
2374                 return NULL;
2375         }
2376
2377         DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2378                 "Trying to read krb5 cache: %s\n",
2379                 krb5_cc_default_name(ctx)));
2380         if (krb5_cc_default(ctx, &cc)) {
2381                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2382                         "failed to read default cache\n"));
2383                 goto out;
2384         }
2385         if (krb5_cc_get_principal(ctx, cc, &princ)) {
2386                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2387                         "failed to get default principal\n"));
2388                 goto out;
2389         }
2390
2391 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2392         realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2393 #elif defined(HAVE_KRB5_PRINC_REALM)
2394         {
2395                 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2396                 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2397         }
2398 #endif
2399
2400   out:
2401
2402         if (ctx) {
2403                 if (princ) {
2404                         krb5_free_principal(ctx, princ);
2405                 }
2406                 if (cc) {
2407                         krb5_cc_close(ctx, cc);
2408                 }
2409                 krb5_free_context(ctx);
2410         }
2411
2412         return realm;
2413 }
2414
2415 /************************************************************************
2416  Routine to get the realm from a given DNS name.
2417 ************************************************************************/
2418
2419 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2420                                                 const char *hostname)
2421 {
2422 #if defined(HAVE_KRB5_REALM_TYPE)
2423         /* Heimdal. */
2424         krb5_realm *realm_list = NULL;
2425 #else
2426         /* MIT */
2427         char **realm_list = NULL;
2428 #endif
2429         char *realm = NULL;
2430         krb5_error_code kerr;
2431         krb5_context ctx = NULL;
2432
2433         initialize_krb5_error_table();
2434         if (krb5_init_context(&ctx)) {
2435                 return NULL;
2436         }
2437
2438         kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2439         if (kerr != 0) {
2440                 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2441                         "failed %s\n",
2442                         hostname ? hostname : "(NULL)",
2443                         error_message(kerr) ));
2444                 goto out;
2445         }
2446
2447         if (realm_list && realm_list[0]) {
2448                 realm = talloc_strdup(mem_ctx, realm_list[0]);
2449         }
2450
2451   out:
2452
2453         if (ctx) {
2454                 if (realm_list) {
2455                         krb5_free_host_realm(ctx, realm_list);
2456                         realm_list = NULL;
2457                 }
2458                 krb5_free_context(ctx);
2459                 ctx = NULL;
2460         }
2461         return realm;
2462 }
2463
2464 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2465                                                    const char *service,
2466                                                    const char *remote_name,
2467                                                    const char *default_realm)
2468 {
2469         char *realm = NULL;
2470         char *host = NULL;
2471         char *principal;
2472         host = strchr_m(remote_name, '.');
2473         if (host) {
2474                 /* DNS name. */
2475                 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2476                                                          remote_name);
2477         } else {
2478                 /* NetBIOS name - use our realm. */
2479                 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2480         }
2481
2482         if (realm == NULL || *realm == '\0') {
2483                 realm = talloc_strdup(talloc_tos(), default_realm);
2484                 if (!realm) {
2485                         return NULL;
2486                 }
2487                 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2488                          "cannot get realm from, "
2489                          "desthost %s or default ccache. Using default "
2490                          "smb.conf realm %s\n",
2491                          remote_name,
2492                          realm));
2493         }
2494
2495         principal = talloc_asprintf(mem_ctx,
2496                                     "%s/%s@%s",
2497                                     service, remote_name,
2498                                     realm);
2499         TALLOC_FREE(realm);
2500         return principal;
2501 }
2502
2503 char *smb_get_krb5_error_message(krb5_context context,
2504                                  krb5_error_code code,
2505                                  TALLOC_CTX *mem_ctx)
2506 {
2507         char *ret;
2508
2509 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2510         const char *context_error = krb5_get_error_message(context, code);
2511         if (context_error) {
2512                 ret = talloc_asprintf(mem_ctx, "%s: %s",
2513                                         error_message(code), context_error);
2514                 krb5_free_error_message(context, context_error);
2515                 return ret;
2516         }
2517 #endif
2518         ret = talloc_strdup(mem_ctx, error_message(code));
2519         return ret;
2520 }
2521
2522
2523 /**
2524 * @brief Return the kerberos library setting for "libdefaults:allow_weak_crypto"
2525 *
2526 * @param context        The krb5_context
2527 *
2528 * @return krb5_boolean
2529 *
2530 * Function returns true if weak crypto is allowd, false if not
2531 */
2532
2533 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2534 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2535 {
2536         return krb5_config_get_bool_default(context,
2537                                             NULL,
2538                                             FALSE,
2539                                             "libdefaults",
2540                                             "allow_weak_crypto",
2541                                             NULL);
2542 }
2543 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2544 {
2545 #include <profile.h>
2546         krb5_error_code ret;
2547         krb5_boolean ret_default = false;
2548         profile_t profile;
2549         int ret_profile;
2550
2551         ret = krb5_get_profile(context,
2552                                &profile);
2553         if (ret) {
2554                 return ret_default;
2555         }
2556
2557         ret = profile_get_boolean(profile,
2558                                   "libdefaults",
2559                                   "allow_weak_crypto",
2560                                   NULL, /* subsubname */
2561                                   ret_default, /* def_val */
2562                                   &ret_profile /* *ret_default */);
2563         if (ret) {
2564                 return ret_default;
2565         }
2566
2567         profile_release(profile);
2568
2569         return ret_profile;
2570 }
2571 #else
2572 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2573 #endif
2574
2575 /**
2576 * @brief Return the type of a krb5_principal
2577 *
2578 * @param context        The krb5_context
2579 * @param principal      The const krb5_principal
2580 *
2581 * @return integer type of the principal
2582 */
2583 int smb_krb5_principal_get_type(krb5_context context,
2584                                 krb5_const_principal principal)
2585 {
2586 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2587         return krb5_principal_get_type(context, principal);
2588 #elif defined(krb5_princ_type) /* MIT */
2589         return krb5_princ_type(context, principal);
2590 #else
2591 #error  UNKNOWN_PRINC_GET_TYPE_FUNCTION
2592 #endif
2593 }
2594
2595 #else /* HAVE_KRB5 */
2596  /* this saves a few linking headaches */
2597  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2598                         const char *principal, time_t time_offset,
2599                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2600                         uint32_t extra_ap_opts,
2601                         const char *ccname, time_t *tgs_expire,
2602                         const char *impersonate_princ_s)
2603 {
2604          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2605          return 1;
2606 }
2607
2608 #endif /* HAVE_KRB5 */