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   get a kerberos5 ticket for the given service
 739 */
 740 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 741                         const char *principal, time_t time_offset,
 742                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 743                         uint32_t extra_ap_opts, const char *ccname,
 744                         time_t *tgs_expire,
 745                         const char *impersonate_princ_s)
 746
 747 {
 748         krb5_error_code retval;
 749         krb5_data packet;
 750         krb5_context context = NULL;
 751         krb5_ccache ccdef = NULL;
 752         krb5_auth_context auth_context = NULL;
 753         krb5_enctype enc_types[] = {
 754 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
 755                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
 756 #endif
 757 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
 758                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
 759 #endif
 760                 ENCTYPE_ARCFOUR_HMAC,
 761                 ENCTYPE_DES_CBC_MD5,
 762                 ENCTYPE_DES_CBC_CRC,
 763                 ENCTYPE_NULL};
 764
 765         initialize_krb5_error_table();
 766         retval = krb5_init_context(&context);
 767         if (retval) {
 768                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 769                          error_message(retval)));
 770                 goto failed;
 771         }
 772
 773         if (time_offset != 0) {
 774                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 775         }
 776
 777         if ((retval = krb5_cc_resolve(context, ccname ?
 778                         ccname : krb5_cc_default_name(context), &ccdef))) {
 779                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 780                          error_message(retval)));
 781                 goto failed;
 782         }
 783
 784         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 785                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 786                          error_message(retval)));
 787                 goto failed;
 788         }
 789
 790         retval = ads_krb5_mk_req(context, &auth_context,
 791                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 792                                 principal, ccdef, &packet,
 793                                 tgs_expire, impersonate_princ_s);
 794         if (retval) {
 795                 goto failed;
 796         }
 797
 798         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 799                                  session_key_krb5, false);
 800
 801         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 802
 803         kerberos_free_data_contents(context, &packet);
 804
 805 failed:
 806
 807         if (context) {
 808                 if (ccdef)
 809                         krb5_cc_close(context, ccdef);
 810                 if (auth_context)
 811                         krb5_auth_con_free(context, auth_context);
 812                 krb5_free_context(context);
 813         }
 814
 815         return retval;
 816 }
 817
 818 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 819                               krb5_context context,
 820                               krb5_auth_context auth_context,
 821                               DATA_BLOB *session_key, bool remote)
 822 {
 823         krb5_keyblock *skey = NULL;
 824         krb5_error_code err = 0;
 825         bool ret = false;
 826
 827         if (remote) {
 828                 err = krb5_auth_con_getremotesubkey(context,
 829                                                     auth_context, &skey);
 830         } else {
 831                 err = krb5_auth_con_getlocalsubkey(context,
 832                                                    auth_context, &skey);
 833         }
 834
 835         if (err || skey == NULL) {
 836                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 837                 goto done;
 838         }
 839
 840         DEBUG(10, ("Got KRB5 session key of length %d\n",
 841                    (int)KRB5_KEY_LENGTH(skey)));
 842
 843         *session_key = data_blob_talloc(mem_ctx,
 844                                          KRB5_KEY_DATA(skey),
 845                                          KRB5_KEY_LENGTH(skey));
 846         dump_data_pw("KRB5 Session Key:\n",
 847                      session_key->data,
 848                      session_key->length);
 849
 850         ret = true;
 851
 852 done:
 853         if (skey) {
 854                 krb5_free_keyblock(context, skey);
 855         }
 856
 857         return ret;
 858 }
 859
 860
 861 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 862  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 863
 864  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 865 {
 866         static krb5_data kdata;
 867
 868         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 869         kdata.length = strlen((const char *)kdata.data);
 870         return &kdata;
 871 }
 872 #endif
 873
 874 /* Prototypes */
 875
 876  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
 877                                        const char *client_string,       /* gd@BER.SUSE.DE */
 878                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
 879                                        time_t *expire_time)
 880 {
 881         krb5_error_code ret;
 882         krb5_context context = NULL;
 883         krb5_ccache ccache = NULL;
 884         krb5_principal client = NULL;
 885         krb5_creds creds, creds_in;
 886
 887         ZERO_STRUCT(creds);
 888         ZERO_STRUCT(creds_in);
 889
 890         initialize_krb5_error_table();
 891         ret = krb5_init_context(&context);
 892         if (ret) {
 893                 goto done;
 894         }
 895
 896         if (!ccache_string) {
 897                 ccache_string = krb5_cc_default_name(context);
 898         }
 899
 900         if (!ccache_string) {
 901                 ret = EINVAL;
 902                 goto done;
 903         }
 904
 905         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
 906
 907         /* FIXME: we should not fall back to defaults */
 908         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
 909         if (ret) {
 910                 goto done;
 911         }
 912
 913         if (client_string) {
 914                 ret = smb_krb5_parse_name(context, client_string, &client);
 915                 if (ret) {
 916                         goto done;
 917                 }
 918         } else {
 919                 ret = krb5_cc_get_principal(context, ccache, &client);
 920                 if (ret) {
 921                         goto done;
 922                 }
 923         }
 924
 925         ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
 926         if (ret) {
 927                 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
 928                 goto done;
 929         }
 930
 931         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
 932         ret = krb5_cc_initialize(context, ccache, client);
 933         if (ret) {
 934                 goto done;
 935         }
 936
 937         ret = krb5_cc_store_cred(context, ccache, &creds);
 938
 939         if (expire_time) {
 940                 *expire_time = (time_t) creds.times.endtime;
 941         }
 942
 943 done:
 944         krb5_free_cred_contents(context, &creds_in);
 945         krb5_free_cred_contents(context, &creds);
 946
 947         if (client) {
 948                 krb5_free_principal(context, client);
 949         }
 950         if (ccache) {
 951                 krb5_cc_close(context, ccache);
 952         }
 953         if (context) {
 954                 krb5_free_context(context);
 955         }
 956
 957         return ret;
 958 }
 959
 960  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
 961 {
 962         krb5_error_code ret = 0;
 963         if (addr == NULL) {
 964                 return ret;
 965         }
 966 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 967         krb5_free_addresses(context, addr->addrs);
 968 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 969         ret = krb5_free_addresses(context, addr->addrs);
 970         SAFE_FREE(addr->addrs);
 971 #endif
 972         SAFE_FREE(addr);
 973         addr = NULL;
 974         return ret;
 975 }
 976
 977 #define MAX_NETBIOSNAME_LEN 16
 978  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
 979                                                    const char *netbios_name)
 980 {
 981         krb5_error_code ret = 0;
 982         char buf[MAX_NETBIOSNAME_LEN];
 983         int len;
 984 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 985         krb5_address **addrs = NULL;
 986 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 987         krb5_addresses *addrs = NULL;
 988 #endif
 989
 990         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
 991         if (*kerb_addr == NULL) {
 992                 return ENOMEM;
 993         }
 994
 995         /* temporarily duplicate put_name() code here to avoid dependency
 996          * issues for a 5 lines function */
 997         len = strlen(netbios_name);
 998         memcpy(buf, netbios_name,
 999                 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
1000         if (len < MAX_NETBIOSNAME_LEN - 1) {
1001                 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
1002         }
1003         buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
1004
1005 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1006         {
1007                 int num_addr = 2;
1008
1009                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1010                 if (addrs == NULL) {
1011                         SAFE_FREE(*kerb_addr);
1012                         return ENOMEM;
1013                 }
1014
1015                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1016
1017                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1018                 if (addrs[0] == NULL) {
1019                         SAFE_FREE(addrs);
1020                         SAFE_FREE(*kerb_addr);
1021                         return ENOMEM;
1022                 }
1023
1024                 addrs[0]->magic = KV5M_ADDRESS;
1025                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1026                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1027                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1028                 if (addrs[0]->contents == NULL) {
1029                         SAFE_FREE(addrs[0]);
1030                         SAFE_FREE(addrs);
1031                         SAFE_FREE(*kerb_addr);
1032                         return ENOMEM;
1033                 }
1034
1035                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1036
1037                 addrs[1] = NULL;
1038         }
1039 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1040         {
1041                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1042                 if (addrs == NULL) {
1043                         SAFE_FREE(*kerb_addr);
1044                         return ENOMEM;
1045                 }
1046
1047                 memset(addrs, 0, sizeof(krb5_addresses));
1048
1049                 addrs->len = 1;
1050                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1051                 if (addrs->val == NULL) {
1052                         SAFE_FREE(addrs);
1053                         SAFE_FREE(kerb_addr);
1054                         return ENOMEM;
1055                 }
1056
1057                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1058                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1059                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1060                 if (addrs->val[0].address.data == NULL) {
1061                         SAFE_FREE(addrs->val);
1062                         SAFE_FREE(addrs);
1063                         SAFE_FREE(*kerb_addr);
1064                         return ENOMEM;
1065                 }
1066
1067                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1068         }
1069 #else
1070 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1071 #endif
1072         (*kerb_addr)->addrs = addrs;
1073
1074         return ret;
1075 }
1076
1077  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1078 {
1079 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1080         krb5_free_error_contents(context, krberror);
1081 #else /* MIT */
1082         krb5_free_error(context, krberror);
1083 #endif
1084 }
1085
1086  krb5_error_code handle_krberror_packet(krb5_context context,
1087                                         krb5_data *packet)
1088 {
1089         krb5_error_code ret;
1090         bool got_error_code = false;
1091
1092         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1093
1094 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1095         {
1096                 krb5_error krberror;
1097
1098                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1099                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1100                                 error_message(ret)));
1101                         return ret;
1102                 }
1103
1104                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1105                         ret = (krb5_error_code) krberror.error_code;
1106                         got_error_code = true;
1107                 }
1108
1109                 smb_krb5_free_error(context, &krberror);
1110         }
1111 #else /* MIT */
1112         {
1113                 krb5_error *krberror;
1114
1115                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1116                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1117                                 error_message(ret)));
1118                         return ret;
1119                 }
1120
1121                 if (krberror->e_data.data == NULL) {
1122 #if defined(ERROR_TABLE_BASE_krb5)
1123                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1124 #else
1125                         ret = (krb5_error_code)krberror->error;
1126 #endif
1127                         got_error_code = true;
1128                 }
1129                 smb_krb5_free_error(context, krberror);
1130         }
1131 #endif
1132         if (got_error_code) {
1133                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1134                         error_message(ret), ret));
1135         }
1136         return ret;
1137 }
1138
1139 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1140                                             krb5_get_init_creds_opt **opt)
1141 {
1142         /* Heimdal or modern MIT version */
1143         return krb5_get_init_creds_opt_alloc(context, opt);
1144 }
1145
1146 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1147                                 krb5_get_init_creds_opt *opt)
1148 {
1149         /* Modern MIT or Heimdal version */
1150         krb5_get_init_creds_opt_free(context, opt);
1151 }
1152
1153 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1154 {
1155         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1156 }
1157
1158 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1159                                         krb5_keytab_entry *kt_entry)
1160 {
1161 /* Try krb5_free_keytab_entry_contents first, since
1162  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1163  * krb5_kt_free_entry but only has a prototype for the first, while the
1164  * second is considered private.
1165  */
1166 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1167         return krb5_free_keytab_entry_contents(context, kt_entry);
1168 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1169         return krb5_kt_free_entry(context, kt_entry);
1170 #else
1171 #error UNKNOWN_KT_FREE_FUNCTION
1172 #endif
1173 }
1174
1175
1176 /* caller needs to free etype_s */
1177 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1178                                            krb5_enctype enctype,
1179                                            char **etype_s)
1180 {
1181 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1182         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1183 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1184         char buf[256];
1185         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1186         if (ret) {
1187                 return ret;
1188         }
1189         *etype_s = SMB_STRDUP(buf);
1190         if (!*etype_s) {
1191                 return ENOMEM;
1192         }
1193         return ret;
1194 #else
1195 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1196 #endif
1197 }
1198
1199 /**********************************************************************
1200  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1201  * allows to process non-default keytab names.
1202  * @param context krb5_context
1203  * @param keytab_name_req string
1204  * @param write_access bool if writable keytab is required
1205  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1206  * @return krb5_error_code
1207 **********************************************************************/
1208
1209 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1210 #ifndef MAX_KEYTAB_NAME_LEN
1211 #define MAX_KEYTAB_NAME_LEN 1100
1212 #endif
1213
1214 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1215                                      const char *keytab_name_req,
1216                                      bool write_access,
1217                                      krb5_keytab *keytab)
1218 {
1219         krb5_error_code ret = 0;
1220         TALLOC_CTX *mem_ctx;
1221         char keytab_string[MAX_KEYTAB_NAME_LEN];
1222         char *kt_str = NULL;
1223         bool found_valid_name = false;
1224         const char *pragma = "FILE";
1225         const char *tmp = NULL;
1226
1227         if (!write_access && !keytab_name_req) {
1228                 /* caller just wants to read the default keytab readonly, so be it */
1229                 return krb5_kt_default(context, keytab);
1230         }
1231
1232         mem_ctx = talloc_init("smb_krb5_open_keytab");
1233         if (!mem_ctx) {
1234                 return ENOMEM;
1235         }
1236
1237 #ifdef HAVE_WRFILE_KEYTAB
1238         if (write_access) {
1239                 pragma = "WRFILE";
1240         }
1241 #endif
1242
1243         if (keytab_name_req) {
1244
1245                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1246                         ret = KRB5_CONFIG_NOTENUFSPACE;
1247                         goto out;
1248                 }
1249
1250                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1251                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1252                         tmp = keytab_name_req;
1253                         goto resolve;
1254                 }
1255
1256                 if (keytab_name_req[0] != '/') {
1257                         ret = KRB5_KT_BADNAME;
1258                         goto out;
1259                 }
1260
1261                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1262                 if (!tmp) {
1263                         ret = ENOMEM;
1264                         goto out;
1265                 }
1266
1267                 goto resolve;
1268         }
1269
1270         /* we need to handle more complex keytab_strings, like:
1271          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1272
1273         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1274         if (ret) {
1275                 goto out;
1276         }
1277
1278         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1279
1280         tmp = talloc_strdup(mem_ctx, keytab_string);
1281         if (!tmp) {
1282                 ret = ENOMEM;
1283                 goto out;
1284         }
1285
1286         if (strncmp(tmp, "ANY:", 4) == 0) {
1287                 tmp += 4;
1288         }
1289
1290         memset(&keytab_string, '\0', sizeof(keytab_string));
1291
1292         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1293                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1294                         found_valid_name = true;
1295                         tmp = kt_str;
1296                         tmp += 7;
1297                 }
1298
1299                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1300                         found_valid_name = true;
1301                         tmp = kt_str;
1302                         tmp += 5;
1303                 }
1304
1305                 if (tmp[0] == '/') {
1306                         /* Treat as a FILE: keytab definition. */
1307                         found_valid_name = true;
1308                 }
1309
1310                 if (found_valid_name) {
1311                         if (tmp[0] != '/') {
1312                                 ret = KRB5_KT_BADNAME;
1313                                 goto out;
1314                         }
1315
1316                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1317                         if (!tmp) {
1318                                 ret = ENOMEM;
1319                                 goto out;
1320                         }
1321                         break;
1322                 }
1323         }
1324
1325         if (!found_valid_name) {
1326                 ret = KRB5_KT_UNKNOWN_TYPE;
1327                 goto out;
1328         }
1329
1330  resolve:
1331         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1332         ret = krb5_kt_resolve(context, tmp, keytab);
1333
1334  out:
1335         TALLOC_FREE(mem_ctx);
1336         return ret;
1337 }
1338
1339 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1340                                      krb5_context context,
1341                                      krb5_keytab keytab,
1342                                      const char **keytab_name)
1343 {
1344         char keytab_string[MAX_KEYTAB_NAME_LEN];
1345         krb5_error_code ret = 0;
1346
1347         ret = krb5_kt_get_name(context, keytab,
1348                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1349         if (ret) {
1350                 return ret;
1351         }
1352
1353         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1354         if (!*keytab_name) {
1355                 return ENOMEM;
1356         }
1357
1358         return ret;
1359 }
1360
1361 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1362     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1363     defined(HAVE_KRB5_GET_CREDS)
1364 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1365                                                              krb5_ccache ccache,
1366                                                              krb5_principal me,
1367                                                              krb5_principal server,
1368                                                              krb5_principal impersonate_princ,
1369                                                              krb5_creds **out_creds)
1370 {
1371         krb5_error_code ret;
1372         krb5_get_creds_opt opt;
1373
1374         ret = krb5_get_creds_opt_alloc(context, &opt);
1375         if (ret) {
1376                 goto done;
1377         }
1378         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1379
1380         if (impersonate_princ) {
1381                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1382                                                          impersonate_princ);
1383                 if (ret) {
1384                         goto done;
1385                 }
1386         }
1387
1388         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1389         if (ret) {
1390                 goto done;
1391         }
1392
1393  done:
1394         if (opt) {
1395                 krb5_get_creds_opt_free(context, opt);
1396         }
1397         return ret;
1398 }
1399 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1400
1401 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1402
1403 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1404 krb5_error_code KRB5_CALLCONV
1405 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1406                               krb5_ccache ccache, krb5_creds *in_creds,
1407                               krb5_data *subject_cert,
1408                               krb5_creds **out_creds);
1409 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1410
1411 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1412                                                          krb5_ccache ccache,
1413                                                          krb5_principal me,
1414                                                          krb5_principal server,
1415                                                          krb5_principal impersonate_princ,
1416                                                          krb5_creds **out_creds)
1417 {
1418         krb5_error_code ret;
1419         krb5_creds in_creds;
1420
1421         ZERO_STRUCT(in_creds);
1422
1423         if (impersonate_princ) {
1424
1425                 in_creds.server = me;
1426                 in_creds.client = impersonate_princ;
1427
1428                 ret = krb5_get_credentials_for_user(context,
1429                                                     0, /* krb5_flags options */
1430                                                     ccache,
1431                                                     &in_creds,
1432                                                     NULL, /* krb5_data *subject_cert */
1433                                                     out_creds);
1434         } else {
1435                 in_creds.client = me;
1436                 in_creds.server = server;
1437
1438                 ret = krb5_get_credentials(context, 0, ccache,
1439                                            &in_creds, out_creds);
1440         }
1441
1442         return ret;
1443 }
1444 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1445
1446 /*
1447  * smb_krb5_get_credentials
1448  *
1449  * @brief Get krb5 credentials for a server
1450  *
1451  * @param[in] context           An initialized krb5_context
1452  * @param[in] ccache            An initialized krb5_ccache
1453  * @param[in] me                The krb5_principal of the caller
1454  * @param[in] server            The krb5_principal of the requested service
1455  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1456  * @param[out] out_creds        The returned krb5_creds structure
1457  * @return krb5_error_code
1458  *
1459  */
1460 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1461                                          krb5_ccache ccache,
1462                                          krb5_principal me,
1463                                          krb5_principal server,
1464                                          krb5_principal impersonate_princ,
1465                                          krb5_creds **out_creds)
1466 {
1467         krb5_error_code ret;
1468         krb5_creds *creds = NULL;
1469
1470         if (out_creds != NULL) {
1471                 *out_creds = NULL;
1472         }
1473
1474         if (impersonate_princ) {
1475 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1476                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1477 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1478                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1479 #else
1480                 ret = ENOTSUP;
1481 #endif
1482         } else {
1483                 krb5_creds in_creds;
1484
1485                 ZERO_STRUCT(in_creds);
1486
1487                 in_creds.client = me;
1488                 in_creds.server = server;
1489
1490                 ret = krb5_get_credentials(context, 0, ccache,
1491                                            &in_creds, &creds);
1492         }
1493         if (ret) {
1494                 goto done;
1495         }
1496
1497         if (out_creds) {
1498                 *out_creds = creds;
1499         }
1500
1501  done:
1502         if (creds && ret) {
1503                 krb5_free_creds(context, creds);
1504         }
1505
1506         return ret;
1507 }
1508
1509 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1510                                                 krb5_enctype enctype,
1511                                                 const void *data,
1512                                                 size_t length,
1513                                                 krb5_keyblock *key)
1514 {
1515 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1516         return krb5_keyblock_init(context, enctype, data, length, key);
1517 #else
1518         memset(key, 0, sizeof(krb5_keyblock));
1519         KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1520         if (NULL == KRB5_KEY_DATA(key)) {
1521                 return ENOMEM;
1522         }
1523         memcpy(KRB5_KEY_DATA(key), data, length);
1524         KRB5_KEY_LENGTH(key) = length;
1525         KRB5_KEY_TYPE(key) = enctype;
1526         return 0;
1527 #endif
1528 }
1529
1530 /*
1531   simulate a kinit, putting the tgt in the given credentials cache.
1532   Orignally by remus@snapserver.com
1533
1534   This version is built to use a keyblock, rather than needing the
1535   original password.
1536
1537   The impersonate_principal is the principal if NULL, or the principal
1538   to impersonate
1539
1540   The target_service defaults to the krbtgt if NULL, but could be
1541    kpasswd/realm or the local service (if we are doing s4u2self)
1542 */
1543 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1544                                            krb5_principal principal,
1545                                            krb5_keyblock *keyblock,
1546                                            const char *target_service,
1547                                            krb5_get_init_creds_opt *krb_options,
1548                                            time_t *expire_time,
1549                                            time_t *kdc_time)
1550 {
1551         krb5_error_code code = 0;
1552         krb5_creds my_creds;
1553
1554 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1555         code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1556                                             keyblock, 0, target_service,
1557                                             krb_options);
1558 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1559 {
1560 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1561         char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1562         krb5_keytab_entry entry;
1563         krb5_keytab keytab;
1564         mode_t mask;
1565
1566         memset(&entry, 0, sizeof(entry));
1567         entry.principal = principal;
1568         *(KRB5_KT_KEY(&entry)) = *keyblock;
1569
1570         memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1571         mask = umask(S_IRWXO | S_IRWXG);
1572         mktemp(tmp_name);
1573         umask(mask);
1574         if (tmp_name[0] == 0) {
1575                 return KRB5_KT_BADNAME;
1576         }
1577         code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1578         if (code) {
1579                 return code;
1580         }
1581
1582         code = krb5_kt_add_entry(ctx, keytab, &entry);
1583         if (code) {
1584                 (void)krb5_kt_close(ctx, keytab);
1585                 goto done;
1586         }
1587
1588         code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1589                                           keytab, 0, target_service,
1590                                           krb_options);
1591         (void)krb5_kt_close(ctx, keytab);
1592 }
1593 #else
1594 #error krb5_get_init_creds_keyblock not available!
1595 #endif
1596         if (code) {
1597                 return code;
1598         }
1599
1600         code = krb5_cc_initialize(ctx, cc, principal);
1601         if (code) {
1602                 goto done;
1603         }
1604
1605         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1606         if (code) {
1607                 goto done;
1608         }
1609
1610         if (expire_time) {
1611                 *expire_time = (time_t) my_creds.times.endtime;
1612         }
1613
1614         if (kdc_time) {
1615                 *kdc_time = (time_t) my_creds.times.starttime;
1616         }
1617
1618         code = 0;
1619 done:
1620         krb5_free_cred_contents(ctx, &my_creds);
1621         return code;
1622 }
1623
1624 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
1625                                            krb5_principal principal,
1626                                            const char *password,
1627                                            const char *target_service,
1628                                            krb5_get_init_creds_opt *krb_options,
1629                                            time_t *expire_time,
1630                                            time_t *kdc_time)
1631 {
1632         krb5_error_code code = 0;
1633         krb5_creds my_creds;
1634
1635         code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1636                                             password, NULL, NULL, 0,
1637                                             target_service, krb_options);
1638         if (code) {
1639                 return code;
1640         }
1641
1642         code = krb5_cc_initialize(ctx, cc, principal);
1643         if (code) {
1644                 goto done;
1645         }
1646
1647         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1648         if (code) {
1649                 goto done;
1650         }
1651
1652         if (expire_time) {
1653                 *expire_time = (time_t) my_creds.times.endtime;
1654         }
1655
1656         if (kdc_time) {
1657                 *kdc_time = (time_t) my_creds.times.starttime;
1658         }
1659
1660         code = 0;
1661 done:
1662         krb5_free_cred_contents(ctx, &my_creds);
1663         return code;
1664 }
1665
1666 #ifdef SAMBA4_USES_HEIMDAL
1667 /*
1668   simulate a kinit, putting the tgt in the given credentials cache.
1669   Orignally by remus@snapserver.com
1670
1671   The impersonate_principal is the principal
1672
1673   The self_service, should be the local service (for S4U2Self if
1674   impersonate_principal is given).
1675
1676   The target_service defaults to the krbtgt if NULL, but could be
1677   kpasswd/realm or a remote service (for S4U2Proxy)
1678
1679 */
1680 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
1681                                         krb5_ccache store_cc,
1682                                         krb5_principal init_principal,
1683                                         const char *init_password,
1684                                         krb5_principal impersonate_principal,
1685                                         const char *self_service,
1686                                         const char *target_service,
1687                                         krb5_get_init_creds_opt *krb_options,
1688                                         time_t *expire_time,
1689                                         time_t *kdc_time)
1690 {
1691         krb5_error_code code = 0;
1692         krb5_get_creds_opt options;
1693         krb5_principal store_principal;
1694         krb5_creds store_creds;
1695         krb5_creds *s4u2self_creds;
1696         Ticket s4u2self_ticket;
1697         size_t s4u2self_ticketlen;
1698         krb5_creds *s4u2proxy_creds;
1699         krb5_principal self_princ;
1700         bool s4u2proxy;
1701         krb5_principal target_princ;
1702         krb5_ccache tmp_cc;
1703         const char *self_realm;
1704         krb5_principal blacklist_principal = NULL;
1705         krb5_principal whitelist_principal = NULL;
1706
1707         code = krb5_get_init_creds_password(ctx, &store_creds,
1708                                             init_principal,
1709                                             init_password,
1710                                             NULL, NULL,
1711                                             0,
1712                                             NULL,
1713                                             krb_options);
1714         if (code != 0) {
1715                 return code;
1716         }
1717
1718         store_principal = init_principal;
1719
1720         /*
1721          * We are trying S4U2Self now:
1722          *
1723          * As we do not want to expose our TGT in the
1724          * krb5_ccache, which is also holds the impersonated creds.
1725          *
1726          * Some low level krb5/gssapi function might use the TGT
1727          * identity and let the client act as our machine account.
1728          *
1729          * We need to avoid that and use a temporary krb5_ccache
1730          * in order to pass our TGT to the krb5_get_creds() function.
1731          */
1732         code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1733         if (code != 0) {
1734                 krb5_free_cred_contents(ctx, &store_creds);
1735                 return code;
1736         }
1737
1738         code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1739         if (code != 0) {
1740                 krb5_cc_destroy(ctx, tmp_cc);
1741                 krb5_free_cred_contents(ctx, &store_creds);
1742                 return code;
1743         }
1744
1745         code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1746         if (code != 0) {
1747                 krb5_free_cred_contents(ctx, &store_creds);
1748                 krb5_cc_destroy(ctx, tmp_cc);
1749                 return code;
1750         }
1751
1752         /*
1753          * we need to remember the client principal of our
1754          * TGT and make sure the KDC does not return this
1755          * in the impersonated tickets. This can happen
1756          * if the KDC does not support S4U2Self and S4U2Proxy.
1757          */
1758         blacklist_principal = store_creds.client;
1759         store_creds.client = NULL;
1760         krb5_free_cred_contents(ctx, &store_creds);
1761
1762         /*
1763          * Check if we also need S4U2Proxy or if S4U2Self is
1764          * enough in order to get a ticket for the target.
1765          */
1766         if (target_service == NULL) {
1767                 s4u2proxy = false;
1768         } else if (strcmp(target_service, self_service) == 0) {
1769                 s4u2proxy = false;
1770         } else {
1771                 s4u2proxy = true;
1772         }
1773
1774         /*
1775          * For S4U2Self we need our own service principal,
1776          * which belongs to our own realm (available on
1777          * our client principal).
1778          */
1779         self_realm = krb5_principal_get_realm(ctx, init_principal);
1780
1781         code = krb5_parse_name(ctx, self_service, &self_princ);
1782         if (code != 0) {
1783                 krb5_free_principal(ctx, blacklist_principal);
1784                 krb5_cc_destroy(ctx, tmp_cc);
1785                 return code;
1786         }
1787
1788         code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1789         if (code != 0) {
1790                 krb5_free_principal(ctx, blacklist_principal);
1791                 krb5_free_principal(ctx, self_princ);
1792                 krb5_cc_destroy(ctx, tmp_cc);
1793                 return code;
1794         }
1795
1796         code = krb5_get_creds_opt_alloc(ctx, &options);
1797         if (code != 0) {
1798                 krb5_free_principal(ctx, blacklist_principal);
1799                 krb5_free_principal(ctx, self_princ);
1800                 krb5_cc_destroy(ctx, tmp_cc);
1801                 return code;
1802         }
1803
1804         if (s4u2proxy) {
1805                 /*
1806                  * If we want S4U2Proxy, we need the forwardable flag
1807                  * on the S4U2Self ticket.
1808                  */
1809                 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1810         }
1811
1812         code = krb5_get_creds_opt_set_impersonate(ctx, options,
1813                                                   impersonate_principal);
1814         if (code != 0) {
1815                 krb5_get_creds_opt_free(ctx, options);
1816                 krb5_free_principal(ctx, blacklist_principal);
1817                 krb5_free_principal(ctx, self_princ);
1818                 krb5_cc_destroy(ctx, tmp_cc);
1819                 return code;
1820         }
1821
1822         code = krb5_get_creds(ctx, options, tmp_cc,
1823                               self_princ, &s4u2self_creds);
1824         krb5_get_creds_opt_free(ctx, options);
1825         krb5_free_principal(ctx, self_princ);
1826         if (code != 0) {
1827                 krb5_free_principal(ctx, blacklist_principal);
1828                 krb5_cc_destroy(ctx, tmp_cc);
1829                 return code;
1830         }
1831
1832         if (!s4u2proxy) {
1833                 krb5_cc_destroy(ctx, tmp_cc);
1834
1835                 /*
1836                  * Now make sure we store the impersonated principal
1837                  * and creds instead of the TGT related stuff
1838                  * in the krb5_ccache of the caller.
1839                  */
1840                 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1841                                                 &store_creds);
1842                 krb5_free_creds(ctx, s4u2self_creds);
1843                 if (code != 0) {
1844                         return code;
1845                 }
1846
1847                 /*
1848                  * It's important to store the principal the KDC
1849                  * returned, as otherwise the caller would not find
1850                  * the S4U2Self ticket in the krb5_ccache lookup.
1851                  */
1852                 store_principal = store_creds.client;
1853                 goto store;
1854         }
1855
1856         /*
1857          * We are trying S4U2Proxy:
1858          *
1859          * We need the ticket from the S4U2Self step
1860          * and our TGT in order to get the delegated ticket.
1861          */
1862         code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1863                              s4u2self_creds->ticket.length,
1864                              &s4u2self_ticket,
1865                              &s4u2self_ticketlen);
1866         if (code != 0) {
1867                 krb5_free_creds(ctx, s4u2self_creds);
1868                 krb5_free_principal(ctx, blacklist_principal);
1869                 krb5_cc_destroy(ctx, tmp_cc);
1870                 return code;
1871         }
1872
1873         /*
1874          * we need to remember the client principal of the
1875          * S4U2Self stage and as it needs to match the one we
1876          * will get for the S4U2Proxy stage. We need this
1877          * in order to detect KDCs which does not support S4U2Proxy.
1878          */
1879         whitelist_principal = s4u2self_creds->client;
1880         s4u2self_creds->client = NULL;
1881         krb5_free_creds(ctx, s4u2self_creds);
1882
1883         /*
1884          * For S4U2Proxy we also got a target service principal,
1885          * which also belongs to our own realm (available on
1886          * our client principal).
1887          */
1888         code = krb5_parse_name(ctx, target_service, &target_princ);
1889         if (code != 0) {
1890                 free_Ticket(&s4u2self_ticket);
1891                 krb5_free_principal(ctx, whitelist_principal);
1892                 krb5_free_principal(ctx, blacklist_principal);
1893                 krb5_cc_destroy(ctx, tmp_cc);
1894                 return code;
1895         }
1896
1897         code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1898         if (code != 0) {
1899                 free_Ticket(&s4u2self_ticket);
1900                 krb5_free_principal(ctx, target_princ);
1901                 krb5_free_principal(ctx, whitelist_principal);
1902                 krb5_free_principal(ctx, blacklist_principal);
1903                 krb5_cc_destroy(ctx, tmp_cc);
1904                 return code;
1905         }
1906
1907         code = krb5_get_creds_opt_alloc(ctx, &options);
1908         if (code != 0) {
1909                 free_Ticket(&s4u2self_ticket);
1910                 krb5_free_principal(ctx, target_princ);
1911                 krb5_free_principal(ctx, whitelist_principal);
1912                 krb5_free_principal(ctx, blacklist_principal);
1913                 krb5_cc_destroy(ctx, tmp_cc);
1914                 return code;
1915         }
1916
1917         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1918         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1919
1920         code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1921         free_Ticket(&s4u2self_ticket);
1922         if (code != 0) {
1923                 krb5_get_creds_opt_free(ctx, options);
1924                 krb5_free_principal(ctx, target_princ);
1925                 krb5_free_principal(ctx, whitelist_principal);
1926                 krb5_free_principal(ctx, blacklist_principal);
1927                 krb5_cc_destroy(ctx, tmp_cc);
1928                 return code;
1929         }
1930
1931         code = krb5_get_creds(ctx, options, tmp_cc,
1932                               target_princ, &s4u2proxy_creds);
1933         krb5_get_creds_opt_free(ctx, options);
1934         krb5_free_principal(ctx, target_princ);
1935         krb5_cc_destroy(ctx, tmp_cc);
1936         if (code != 0) {
1937                 krb5_free_principal(ctx, whitelist_principal);
1938                 krb5_free_principal(ctx, blacklist_principal);
1939                 return code;
1940         }
1941
1942         /*
1943          * Now make sure we store the impersonated principal
1944          * and creds instead of the TGT related stuff
1945          * in the krb5_ccache of the caller.
1946          */
1947         code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
1948                                         &store_creds);
1949         krb5_free_creds(ctx, s4u2proxy_creds);
1950         if (code != 0) {
1951                 krb5_free_principal(ctx, whitelist_principal);
1952                 krb5_free_principal(ctx, blacklist_principal);
1953                 return code;
1954         }
1955
1956         /*
1957          * It's important to store the principal the KDC
1958          * returned, as otherwise the caller would not find
1959          * the S4U2Self ticket in the krb5_ccache lookup.
1960          */
1961         store_principal = store_creds.client;
1962
1963  store:
1964         if (blacklist_principal &&
1965             krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
1966                 char *sp = NULL;
1967                 char *ip = NULL;
1968
1969                 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
1970                 if (code != 0) {
1971                         sp = NULL;
1972                 }
1973                 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
1974                 if (code != 0) {
1975                         ip = NULL;
1976                 }
1977                 DEBUG(1, ("kerberos_kinit_password_cc: "
1978                           "KDC returned self principal[%s] while impersonating [%s]\n",
1979                           sp?sp:"<no memory>",
1980                           ip?ip:"<no memory>"));
1981
1982                 SAFE_FREE(sp);
1983                 SAFE_FREE(ip);
1984
1985                 krb5_free_principal(ctx, whitelist_principal);
1986                 krb5_free_principal(ctx, blacklist_principal);
1987                 krb5_free_cred_contents(ctx, &store_creds);
1988                 return KRB5_FWD_BAD_PRINCIPAL;
1989         }
1990         if (blacklist_principal) {
1991                 krb5_free_principal(ctx, blacklist_principal);
1992         }
1993
1994         if (whitelist_principal &&
1995             !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
1996                 char *sp = NULL;
1997                 char *ep = NULL;
1998
1999                 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2000                 if (code != 0) {
2001                         sp = NULL;
2002                 }
2003                 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2004                 if (code != 0) {
2005                         ep = NULL;
2006                 }
2007                 DEBUG(1, ("kerberos_kinit_password_cc: "
2008                           "KDC returned wrong principal[%s] we expected [%s]\n",
2009                           sp?sp:"<no memory>",
2010                           ep?ep:"<no memory>"));
2011
2012                 SAFE_FREE(sp);
2013                 SAFE_FREE(ep);
2014
2015                 krb5_free_principal(ctx, whitelist_principal);
2016                 krb5_free_cred_contents(ctx, &store_creds);
2017                 return KRB5_FWD_BAD_PRINCIPAL;
2018         }
2019         if (whitelist_principal) {
2020                 krb5_free_principal(ctx, whitelist_principal);
2021         }
2022
2023         code = krb5_cc_initialize(ctx, store_cc, store_principal);
2024         if (code != 0) {
2025                 krb5_free_cred_contents(ctx, &store_creds);
2026                 return code;
2027         }
2028
2029         code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2030         if (code != 0) {
2031                 krb5_free_cred_contents(ctx, &store_creds);
2032                 return code;
2033         }
2034
2035         if (expire_time) {
2036                 *expire_time = (time_t) store_creds.times.endtime;
2037         }
2038
2039         if (kdc_time) {
2040                 *kdc_time = (time_t) store_creds.times.starttime;
2041         }
2042
2043         krb5_free_cred_contents(ctx, &store_creds);
2044
2045         return 0;
2046 }
2047 #endif
2048
2049 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2050 krb5_error_code smb_krb5_make_principal(krb5_context context,
2051                                         krb5_principal *principal,
2052                                         const char *_realm, ...)
2053 {
2054         krb5_error_code code;
2055         bool free_realm;
2056         char *realm;
2057         va_list ap;
2058
2059         if (_realm) {
2060                 realm = _realm;
2061                 free_realm = false;
2062         } else {
2063                 code = krb5_get_default_realm(context, &realm);
2064                 if (code) {
2065                         return code;
2066                 }
2067                 free_realm = true;
2068         }
2069
2070         va_start(ap, _realm);
2071         code = krb5_build_principal_alloc_va(context, principal,
2072                                              strlen(realm), realm,
2073                                              ap);
2074         va_end(ap);
2075
2076         if (free_realm) {
2077                 krb5_free_default_realm(context, realm);
2078         }
2079
2080         return code;
2081 }
2082 #endif
2083
2084 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2085 /**
2086  * @brief Get the lifetime of the initial ticket in the cache.
2087  *
2088  * @param[in]  context  The kerberos context.
2089  *
2090  * @param[in]  id       The credential cache to get the ticket lifetime.
2091  *
2092  * @param[out] t        A pointer to a time value to store the lifetime.
2093  *
2094  * @return              0 on success, a krb5_error_code on error.
2095  */
2096 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2097                                          krb5_ccache id,
2098                                          time_t *t)
2099 {
2100         krb5_cc_cursor cursor;
2101         krb5_error_code kerr;
2102         krb5_creds cred;
2103         krb5_timestamp now;
2104
2105         *t = 0;
2106
2107         kerr = krb5_timeofday(context, &now);
2108         if (kerr) {
2109                 return kerr;
2110         }
2111
2112         kerr = krb5_cc_start_seq_get(context, id, &cursor);
2113         if (kerr) {
2114                 return kerr;
2115         }
2116
2117         while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2118 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2119                 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2120 #else
2121                 if (cred.flags.b.initial) {
2122 #endif
2123                         if (now < cred.times.endtime) {
2124                                 *t = (time_t) (cred.times.endtime - now);
2125                         }
2126                         krb5_free_cred_contents(context, &cred);
2127                         break;
2128                 }
2129                 krb5_free_cred_contents(context, &cred);
2130         }
2131
2132         krb5_cc_end_seq_get(context, id, &cursor);
2133
2134         return kerr;
2135 }
2136 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2137
2138 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2139 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2140 {
2141         free_Checksum(cksum);
2142 }
2143 #endif
2144
2145 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2146                                            DATA_BLOB *pac_data,
2147                                            krb5_context context,
2148                                            const krb5_keyblock *keyblock,
2149                                            uint32_t *sig_type,
2150                                            DATA_BLOB *sig_blob)
2151 {
2152         krb5_error_code ret;
2153         krb5_checksum cksum;
2154 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2155         krb5_crypto crypto;
2156
2157
2158         ret = krb5_crypto_init(context,
2159                                keyblock,
2160                                0,
2161                                &crypto);
2162         if (ret) {
2163                 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2164                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2165                 return ret;
2166         }
2167         ret = krb5_create_checksum(context,
2168                                    crypto,
2169                                    KRB5_KU_OTHER_CKSUM,
2170                                    0,
2171                                    pac_data->data,
2172                                    pac_data->length,
2173                                    &cksum);
2174         if (ret) {
2175                 DEBUG(2, ("PAC Verification failed: %s\n",
2176                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2177         }
2178
2179         krb5_crypto_destroy(context, crypto);
2180
2181         if (ret) {
2182                 return ret;
2183         }
2184
2185         *sig_type = cksum.cksumtype;
2186         *sig_blob = data_blob_talloc(mem_ctx,
2187                                         cksum.checksum.data,
2188                                         cksum.checksum.length);
2189 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2190         krb5_data input;
2191
2192         input.data = (char *)pac_data->data;
2193         input.length = pac_data->length;
2194
2195         ret = krb5_c_make_checksum(context,
2196                                    0,
2197                                    keyblock,
2198                                    KRB5_KEYUSAGE_APP_DATA_CKSUM,
2199                                    &input,
2200                                    &cksum);
2201         if (ret) {
2202                 DEBUG(2, ("PAC Verification failed: %s\n",
2203                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2204                 return ret;
2205         }
2206
2207         *sig_type = cksum.checksum_type;
2208         *sig_blob = data_blob_talloc(mem_ctx,
2209                                         cksum.contents,
2210                                         cksum.length);
2211
2212 #else
2213 #error krb5_create_checksum or krb5_c_make_checksum not available
2214 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2215         smb_krb5_free_checksum_contents(context, &cksum);
2216
2217         return 0;
2218 }
2219
2220
2221 /*
2222  * smb_krb5_principal_get_realm
2223  *
2224  * @brief Get realm of a principal
2225  *
2226  * @param[in] context           The krb5_context
2227  * @param[in] principal         The principal
2228  * @return pointer to the realm
2229  *
2230  */
2231
2232 char *smb_krb5_principal_get_realm(krb5_context context,
2233                                    krb5_principal principal)
2234 {
2235 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2236         return discard_const_p(char, krb5_principal_get_realm(context, principal));
2237 #elif defined(krb5_princ_realm) /* MIT */
2238         krb5_data *realm;
2239         realm = krb5_princ_realm(context, principal);
2240         return discard_const_p(char, realm->data);
2241 #else
2242         return NULL;
2243 #endif
2244 }
2245
2246 /************************************************************************
2247  Routine to get the default realm from the kerberos credentials cache.
2248  Caller must free if the return value is not NULL.
2249 ************************************************************************/
2250
2251 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2252 {
2253         char *realm = NULL;
2254         krb5_context ctx = NULL;
2255         krb5_ccache cc = NULL;
2256         krb5_principal princ = NULL;
2257
2258         initialize_krb5_error_table();
2259         if (krb5_init_context(&ctx)) {
2260                 return NULL;
2261         }
2262
2263         DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2264                 "Trying to read krb5 cache: %s\n",
2265                 krb5_cc_default_name(ctx)));
2266         if (krb5_cc_default(ctx, &cc)) {
2267                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2268                         "failed to read default cache\n"));
2269                 goto out;
2270         }
2271         if (krb5_cc_get_principal(ctx, cc, &princ)) {
2272                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2273                         "failed to get default principal\n"));
2274                 goto out;
2275         }
2276
2277 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2278         realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2279 #elif defined(HAVE_KRB5_PRINC_REALM)
2280         {
2281                 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2282                 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2283         }
2284 #endif
2285
2286   out:
2287
2288         if (ctx) {
2289                 if (princ) {
2290                         krb5_free_principal(ctx, princ);
2291                 }
2292                 if (cc) {
2293                         krb5_cc_close(ctx, cc);
2294                 }
2295                 krb5_free_context(ctx);
2296         }
2297
2298         return realm;
2299 }
2300
2301 /************************************************************************
2302  Routine to get the realm from a given DNS name.
2303 ************************************************************************/
2304
2305 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2306                                                 const char *hostname)
2307 {
2308 #if defined(HAVE_KRB5_REALM_TYPE)
2309         /* Heimdal. */
2310         krb5_realm *realm_list = NULL;
2311 #else
2312         /* MIT */
2313         char **realm_list = NULL;
2314 #endif
2315         char *realm = NULL;
2316         krb5_error_code kerr;
2317         krb5_context ctx = NULL;
2318
2319         initialize_krb5_error_table();
2320         if (krb5_init_context(&ctx)) {
2321                 return NULL;
2322         }
2323
2324         kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2325         if (kerr != 0) {
2326                 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2327                         "failed %s\n",
2328                         hostname ? hostname : "(NULL)",
2329                         error_message(kerr) ));
2330                 goto out;
2331         }
2332
2333         if (realm_list && realm_list[0]) {
2334                 realm = talloc_strdup(mem_ctx, realm_list[0]);
2335         }
2336
2337   out:
2338
2339         if (ctx) {
2340                 if (realm_list) {
2341                         krb5_free_host_realm(ctx, realm_list);
2342                         realm_list = NULL;
2343                 }
2344                 krb5_free_context(ctx);
2345                 ctx = NULL;
2346         }
2347         return realm;
2348 }
2349
2350 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2351                                                    const char *service,
2352                                                    const char *remote_name,
2353                                                    const char *default_realm)
2354 {
2355         char *realm = NULL;
2356         char *host = NULL;
2357         char *principal;
2358         host = strchr_m(remote_name, '.');
2359         if (host) {
2360                 /* DNS name. */
2361                 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2362                                                          remote_name);
2363         } else {
2364                 /* NetBIOS name - use our realm. */
2365                 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2366         }
2367
2368         if (realm == NULL || *realm == '\0') {
2369                 realm = talloc_strdup(talloc_tos(), default_realm);
2370                 if (!realm) {
2371                         return NULL;
2372                 }
2373                 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2374                          "cannot get realm from, "
2375                          "desthost %s or default ccache. Using default "
2376                          "smb.conf realm %s\n",
2377                          remote_name,
2378                          realm));
2379         }
2380
2381         principal = talloc_asprintf(mem_ctx,
2382                                     "%s/%s@%s",
2383                                     service, remote_name,
2384                                     realm);
2385         TALLOC_FREE(realm);
2386         return principal;
2387 }
2388
2389 char *smb_get_krb5_error_message(krb5_context context,
2390                                  krb5_error_code code,
2391                                  TALLOC_CTX *mem_ctx)
2392 {
2393         char *ret;
2394
2395 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2396         const char *context_error = krb5_get_error_message(context, code);
2397         if (context_error) {
2398                 ret = talloc_asprintf(mem_ctx, "%s: %s",
2399                                         error_message(code), context_error);
2400                 krb5_free_error_message(context, context_error);
2401                 return ret;
2402         }
2403 #endif
2404         ret = talloc_strdup(mem_ctx, error_message(code));
2405         return ret;
2406 }
2407
2408 #else /* HAVE_KRB5 */
2409  /* this saves a few linking headaches */
2410  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2411                         const char *principal, time_t time_offset,
2412                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2413                         uint32_t extra_ap_opts,
2414                         const char *ccname, time_t *tgs_expire,
2415                         const char *impersonate_princ_s)
2416 {
2417          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2418          return 1;
2419 }
2420
2421 #endif /* HAVE_KRB5 */