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 "krb5_samba.h"
  25 #include "librpc/gen_ndr/krb5pac.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 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
  59
  60 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
  61
  62 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
  63  * to krb5_set_default_tgs_ktypes. See
  64  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
  65  *
  66  * If the MIT libraries are not exporting internal symbols, we will end up in
  67  * this branch, which is correct. Otherwise we will continue to use the
  68  * internal symbol
  69  */
  70  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  71 {
  72     return krb5_set_default_tgs_enctypes(ctx, enc);
  73 }
  74
  75 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
  76
  77 /* Heimdal */
  78  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  79 {
  80         return krb5_set_default_in_tkt_etypes(ctx, enc);
  81 }
  82
  83 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
  84
  85 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
  86
  87 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
  88 /* HEIMDAL */
  89  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
  90 {
  91         memset(pkaddr, '\0', sizeof(krb5_address));
  92 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
  93         if (paddr->ss_family == AF_INET6) {
  94                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
  95                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
  96                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
  97                 return true;
  98         }
  99 #endif
 100         if (paddr->ss_family == AF_INET) {
 101                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 102                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 103                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 104                 return true;
 105         }
 106         return false;
 107 }
 108 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 109 /* MIT */
 110 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 111 {
 112         memset(pkaddr, '\0', sizeof(krb5_address));
 113 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 114         if (paddr->ss_family == AF_INET6) {
 115                 pkaddr->addrtype = ADDRTYPE_INET6;
 116                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 117                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 118                 return true;
 119         }
 120 #endif
 121         if (paddr->ss_family == AF_INET) {
 122                 pkaddr->addrtype = ADDRTYPE_INET;
 123                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 124                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 125                 return true;
 126         }
 127         return false;
 128 }
 129 #else
 130 #error UNKNOWN_ADDRTYPE
 131 #endif
 132
 133 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
 134 /* MIT */
 135 int create_kerberos_key_from_string_direct(krb5_context context,
 136                                                   krb5_principal host_princ,
 137                                                   krb5_data *password,
 138                                                   krb5_keyblock *key,
 139                                                   krb5_enctype enctype)
 140 {
 141         int ret = 0;
 142         krb5_data salt;
 143
 144         ret = krb5_principal2salt(context, host_princ, &salt);
 145         if (ret) {
 146                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 147                 return ret;
 148         }
 149         ret = krb5_c_string_to_key(context, enctype, password, &salt, key);
 150         SAFE_FREE(salt.data);
 151
 152         return ret;
 153 }
 154 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 155 /* Heimdal */
 156 int create_kerberos_key_from_string_direct(krb5_context context,
 157                                                   krb5_principal host_princ,
 158                                                   krb5_data *password,
 159                                                   krb5_keyblock *key,
 160                                                   krb5_enctype enctype)
 161 {
 162         int ret;
 163         krb5_salt salt;
 164
 165         ret = krb5_get_pw_salt(context, host_princ, &salt);
 166         if (ret) {
 167                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 168                 return ret;
 169         }
 170
 171         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 172         krb5_free_salt(context, salt);
 173
 174         return ret;
 175 }
 176 #else
 177 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 178 #endif
 179
 180 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 181  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 182                                             krb5_enctype **enctypes)
 183 {
 184         return krb5_get_permitted_enctypes(context, enctypes);
 185 }
 186 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 187  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 188                                             krb5_enctype **enctypes)
 189 {
 190 #ifdef HAVE_KRB5_PDU_NONE_DECL
 191         return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
 192 #else
 193         return krb5_get_default_in_tkt_etypes(context, enctypes);
 194 #endif
 195 }
 196 #else
 197 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 198 #endif
 199
 200 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 201  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 202                                         krb5_auth_context auth_context,
 203                                         krb5_keyblock *keyblock)
 204 {
 205         return krb5_auth_con_setkey(context, auth_context, keyblock);
 206 }
 207 #endif
 208
 209 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 210                            DATA_BLOB *edata,
 211                            DATA_BLOB *edata_out)
 212 {
 213         DATA_BLOB edata_contents;
 214         ASN1_DATA *data;
 215         int edata_type;
 216
 217         if (!edata->length) {
 218                 return false;
 219         }
 220
 221         data = asn1_init(mem_ctx);
 222         if (data == NULL) {
 223                 return false;
 224         }
 225
 226         asn1_load(data, *edata);
 227         asn1_start_tag(data, ASN1_SEQUENCE(0));
 228         asn1_start_tag(data, ASN1_CONTEXT(1));
 229         asn1_read_Integer(data, &edata_type);
 230
 231         if (edata_type != KRB5_PADATA_PW_SALT) {
 232                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 233                         KRB5_PADATA_PW_SALT, edata_type));
 234                 asn1_free(data);
 235                 return false;
 236         }
 237
 238         asn1_start_tag(data, ASN1_CONTEXT(2));
 239         asn1_read_OctetString(data, talloc_tos(), &edata_contents);
 240         asn1_end_tag(data);
 241         asn1_end_tag(data);
 242         asn1_end_tag(data);
 243         asn1_free(data);
 244
 245         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 246
 247         data_blob_free(&edata_contents);
 248
 249         return true;
 250 }
 251
 252
 253 static bool ads_cleanup_expired_creds(krb5_context context,
 254                                       krb5_ccache  ccache,
 255                                       krb5_creds  *credsp)
 256 {
 257         krb5_error_code retval;
 258         const char *cc_type = krb5_cc_get_type(context, ccache);
 259
 260         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 261                   cc_type, krb5_cc_get_name(context, ccache),
 262                   http_timestring(talloc_tos(), credsp->times.endtime)));
 263
 264         /* we will probably need new tickets if the current ones
 265            will expire within 10 seconds.
 266         */
 267         if (credsp->times.endtime >= (time(NULL) + 10))
 268                 return false;
 269
 270         /* heimdal won't remove creds from a file ccache, and
 271            perhaps we shouldn't anyway, since internally we
 272            use memory ccaches, and a FILE one probably means that
 273            we're using creds obtained outside of our exectuable
 274         */
 275         if (strequal(cc_type, "FILE")) {
 276                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 277                 return false;
 278         }
 279
 280         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 281         if (retval) {
 282                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 283                           error_message(retval)));
 284                 /* If we have an error in this, we want to display it,
 285                    but continue as though we deleted it */
 286         }
 287         return true;
 288 }
 289
 290 /* Allocate and setup the auth context into the state we need. */
 291
 292 static krb5_error_code setup_auth_context(krb5_context context,
 293                         krb5_auth_context *auth_context)
 294 {
 295         krb5_error_code retval;
 296
 297         retval = krb5_auth_con_init(context, auth_context );
 298         if (retval) {
 299                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 300                         error_message(retval)));
 301                 return retval;
 302         }
 303
 304         /* Ensure this is an addressless ticket. */
 305         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 306         if (retval) {
 307                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 308                         error_message(retval)));
 309         }
 310
 311         return retval;
 312 }
 313
 314 #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)
 315 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 316                                                 uint32_t gss_flags)
 317 {
 318         unsigned int orig_length = in_data->length;
 319         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 320         char *gss_cksum = NULL;
 321
 322         if (orig_length) {
 323                 /* Extra length field for delgated ticket. */
 324                 base_cksum_size += 4;
 325         }
 326
 327         if ((unsigned int)base_cksum_size + orig_length <
 328                         (unsigned int)base_cksum_size) {
 329                 return EINVAL;
 330         }
 331
 332         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 333         if (gss_cksum == NULL) {
 334                 return ENOMEM;
 335         }
 336
 337         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 338         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 339
 340         /*
 341          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 342          * This matches the behavior of heimdal and mit.
 343          *
 344          * And it is needed to work against some closed source
 345          * SMB servers.
 346          *
 347          * See bug #7883
 348          */
 349         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 350
 351         SIVAL(gss_cksum, 20, gss_flags);
 352
 353         if (orig_length) {
 354                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 355                 SSVAL(gss_cksum, 26, orig_length);
 356                 /* Copy the kerberos KRB_CRED data */
 357                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 358                 free(in_data->data);
 359                 in_data->data = NULL;
 360                 in_data->length = 0;
 361         }
 362         in_data->data = gss_cksum;
 363         in_data->length = base_cksum_size + orig_length;
 364         return 0;
 365 }
 366 #endif
 367
 368 /**************************************************************
 369  krb5_parse_name that takes a UNIX charset.
 370 **************************************************************/
 371
 372 krb5_error_code smb_krb5_parse_name(krb5_context context,
 373                                 const char *name, /* in unix charset */
 374                                 krb5_principal *principal)
 375 {
 376         krb5_error_code ret;
 377         char *utf8_name;
 378         size_t converted_size;
 379         TALLOC_CTX *frame = talloc_stackframe();
 380
 381         if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
 382                 talloc_free(frame);
 383                 return ENOMEM;
 384         }
 385
 386         ret = krb5_parse_name(context, utf8_name, principal);
 387         TALLOC_FREE(frame);
 388         return ret;
 389 }
 390
 391 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 392 void krb5_free_unparsed_name(krb5_context context, char *val)
 393 {
 394         SAFE_FREE(val);
 395 }
 396 #endif
 397
 398 /**************************************************************
 399  krb5_parse_name that returns a UNIX charset name. Must
 400  be freed with talloc_free() call.
 401 **************************************************************/
 402
 403 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 404                                       krb5_context context,
 405                                       krb5_const_principal principal,
 406                                       char **unix_name)
 407 {
 408         krb5_error_code ret;
 409         char *utf8_name;
 410         size_t converted_size;
 411
 412         *unix_name = NULL;
 413         ret = krb5_unparse_name(context, principal, &utf8_name);
 414         if (ret) {
 415                 return ret;
 416         }
 417
 418         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 419                 krb5_free_unparsed_name(context, utf8_name);
 420                 return ENOMEM;
 421         }
 422         krb5_free_unparsed_name(context, utf8_name);
 423         return 0;
 424 }
 425
 426 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
 427                                             const char *name,
 428                                             krb5_principal *principal)
 429 {
 430         /* we are cheating here because parse_name will in fact set the realm.
 431          * We don't care as the only caller of smb_krb5_parse_name_norealm
 432          * ignores the realm anyway when calling
 433          * smb_krb5_principal_compare_any_realm later - Guenther */
 434
 435         return smb_krb5_parse_name(context, name, principal);
 436 }
 437
 438 bool smb_krb5_principal_compare_any_realm(krb5_context context,
 439                                           krb5_const_principal princ1,
 440                                           krb5_const_principal princ2)
 441 {
 442         return krb5_principal_compare_any_realm(context, princ1, princ2);
 443 }
 444
 445 /*
 446   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 447 */
 448 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 449                                        krb5_auth_context *auth_context,
 450                                        const krb5_flags ap_req_options,
 451                                        const char *principal,
 452                                        krb5_ccache ccache,
 453                                        krb5_data *outbuf,
 454                                        time_t *expire_time,
 455                                        const char *impersonate_princ_s)
 456 {
 457         krb5_error_code           retval;
 458         krb5_principal    server;
 459         krb5_principal impersonate_princ = NULL;
 460         krb5_creds              * credsp;
 461         krb5_creds                creds;
 462         krb5_data in_data;
 463         bool creds_ready = false;
 464         int i = 0, maxtries = 3;
 465
 466         ZERO_STRUCT(in_data);
 467
 468         retval = smb_krb5_parse_name(context, principal, &server);
 469         if (retval) {
 470                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 471                 return retval;
 472         }
 473
 474         if (impersonate_princ_s) {
 475                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 476                                              &impersonate_princ);
 477                 if (retval) {
 478                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 479                         goto cleanup_princ;
 480                 }
 481         }
 482
 483         /* obtain ticket & session key */
 484         ZERO_STRUCT(creds);
 485         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 486                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 487                          error_message(retval)));
 488                 goto cleanup_princ;
 489         }
 490
 491         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 492                 /* This can commonly fail on smbd startup with no ticket in the cache.
 493                  * Report at higher level than 1. */
 494                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 495                          error_message(retval)));
 496                 goto cleanup_creds;
 497         }
 498
 499         while (!creds_ready && (i < maxtries)) {
 500
 501                 if ((retval = smb_krb5_get_credentials(context, ccache,
 502                                                        creds.client,
 503                                                        creds.server,
 504                                                        impersonate_princ,
 505                                                        &credsp))) {
 506                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 507                                 principal, error_message(retval)));
 508                         goto cleanup_creds;
 509                 }
 510
 511                 /* cope with ticket being in the future due to clock skew */
 512                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 513                         time_t t = time(NULL);
 514                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 515                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 516                         krb5_set_real_time(context, t + time_offset + 1, 0);
 517                 }
 518
 519                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 520                         creds_ready = true;
 521                 }
 522
 523                 i++;
 524         }
 525
 526         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 527                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 528                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 529                   (unsigned)credsp->times.endtime));
 530
 531         if (expire_time) {
 532                 *expire_time = (time_t)credsp->times.endtime;
 533         }
 534
 535         /* Allocate the auth_context. */
 536         retval = setup_auth_context(context, auth_context);
 537         if (retval) {
 538                 DEBUG(1,("setup_auth_context failed (%s)\n",
 539                         error_message(retval)));
 540                 goto cleanup_creds;
 541         }
 542
 543 #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)
 544         {
 545                 uint32_t gss_flags = 0;
 546
 547                 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 548                         /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 549                          as part of the kerberos exchange. */
 550
 551                         DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 552
 553                         retval = krb5_auth_con_setuseruserkey(context,
 554                                         *auth_context,
 555                                         &credsp->keyblock );
 556                         if (retval) {
 557                                 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 558                                         error_message(retval)));
 559                                 goto cleanup_creds;
 560                         }
 561
 562                         /* Must use a subkey for forwarded tickets. */
 563                         retval = krb5_auth_con_setflags(context,
 564                                 *auth_context,
 565                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 566                         if (retval) {
 567                                 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 568                                         error_message(retval)));
 569                                 goto cleanup_creds;
 570                         }
 571
 572                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 573                                 *auth_context,  /* Authentication context [in] */
 574                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 575                                 credsp->client, /* Client principal for the tgt [in] */
 576                                 credsp->server, /* Server principal for the tgt [in] */
 577                                 ccache,         /* Credential cache to use for storage [in] */
 578                                 1,              /* Turn on for "Forwardable ticket" [in] */
 579                                 &in_data );     /* Resulting response [out] */
 580
 581                         if (retval) {
 582                                 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 583                                            error_message( retval ) ) );
 584
 585                                 /*
 586                                  * This is not fatal. Delete the *auth_context and continue
 587                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
 588                                  */
 589
 590                                 if (in_data.data) {
 591                                         free( in_data.data );
 592                                         in_data.data = NULL;
 593                                         in_data.length = 0;
 594                                 }
 595                                 krb5_auth_con_free(context, *auth_context);
 596                                 *auth_context = NULL;
 597                                 retval = setup_auth_context(context, auth_context);
 598                                 if (retval) {
 599                                         DEBUG(1,("setup_auth_context failed (%s)\n",
 600                                                 error_message(retval)));
 601                                         goto cleanup_creds;
 602                                 }
 603                         } else {
 604                                 /* We got a delegated ticket. */
 605                                 gss_flags |= GSS_C_DELEG_FLAG;
 606                         }
 607                 }
 608
 609                 /* Frees and reallocates in_data into a GSS checksum blob. */
 610                 retval = create_gss_checksum(&in_data, gss_flags);
 611                 if (retval) {
 612                         goto cleanup_data;
 613                 }
 614
 615                 /* We always want GSS-checksum types. */
 616                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 617                 if (retval) {
 618                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 619                                 error_message(retval)));
 620                         goto cleanup_data;
 621                 }
 622         }
 623 #endif
 624
 625         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 626                                       &in_data, credsp, outbuf);
 627         if (retval) {
 628                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 629                          error_message(retval)));
 630         }
 631
 632 #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)
 633 cleanup_data:
 634 #endif
 635
 636         if (in_data.data) {
 637                 free( in_data.data );
 638                 in_data.length = 0;
 639         }
 640
 641         krb5_free_creds(context, credsp);
 642
 643 cleanup_creds:
 644         krb5_free_cred_contents(context, &creds);
 645
 646 cleanup_princ:
 647         krb5_free_principal(context, server);
 648         if (impersonate_princ) {
 649                 krb5_free_principal(context, impersonate_princ);
 650         }
 651
 652         return retval;
 653 }
 654
 655 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 656 {
 657 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 658         if (pdata->data) {
 659                 krb5_free_data_contents(context, pdata);
 660         }
 661 #elif defined(HAVE_KRB5_DATA_FREE)
 662         krb5_data_free(context, pdata);
 663 #else
 664         SAFE_FREE(pdata->data);
 665 #endif
 666 }
 667
 668 /*
 669   get a kerberos5 ticket for the given service
 670 */
 671 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 672                         const char *principal, time_t time_offset,
 673                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 674                         uint32_t extra_ap_opts, const char *ccname,
 675                         time_t *tgs_expire,
 676                         const char *impersonate_princ_s)
 677
 678 {
 679         krb5_error_code retval;
 680         krb5_data packet;
 681         krb5_context context = NULL;
 682         krb5_ccache ccdef = NULL;
 683         krb5_auth_context auth_context = NULL;
 684         krb5_enctype enc_types[] = {
 685                 ENCTYPE_ARCFOUR_HMAC,
 686                 ENCTYPE_DES_CBC_MD5,
 687                 ENCTYPE_DES_CBC_CRC,
 688                 ENCTYPE_NULL};
 689
 690         initialize_krb5_error_table();
 691         retval = krb5_init_context(&context);
 692         if (retval) {
 693                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 694                          error_message(retval)));
 695                 goto failed;
 696         }
 697
 698         if (time_offset != 0) {
 699                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 700         }
 701
 702         if ((retval = krb5_cc_resolve(context, ccname ?
 703                         ccname : krb5_cc_default_name(context), &ccdef))) {
 704                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 705                          error_message(retval)));
 706                 goto failed;
 707         }
 708
 709         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 710                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 711                          error_message(retval)));
 712                 goto failed;
 713         }
 714
 715         retval = ads_krb5_mk_req(context, &auth_context,
 716                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 717                                 principal, ccdef, &packet,
 718                                 tgs_expire, impersonate_princ_s);
 719         if (retval) {
 720                 goto failed;
 721         }
 722
 723         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 724                                  session_key_krb5, false);
 725
 726         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 727
 728         kerberos_free_data_contents(context, &packet);
 729
 730 failed:
 731
 732         if (context) {
 733                 if (ccdef)
 734                         krb5_cc_close(context, ccdef);
 735                 if (auth_context)
 736                         krb5_auth_con_free(context, auth_context);
 737                 krb5_free_context(context);
 738         }
 739
 740         return retval;
 741 }
 742
 743 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 744                               krb5_context context,
 745                               krb5_auth_context auth_context,
 746                               DATA_BLOB *session_key, bool remote)
 747 {
 748         krb5_keyblock *skey = NULL;
 749         krb5_error_code err = 0;
 750         bool ret = false;
 751
 752         if (remote) {
 753                 err = krb5_auth_con_getremotesubkey(context,
 754                                                     auth_context, &skey);
 755         } else {
 756                 err = krb5_auth_con_getlocalsubkey(context,
 757                                                    auth_context, &skey);
 758         }
 759
 760         if (err || skey == NULL) {
 761                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 762                 goto done;
 763         }
 764
 765         DEBUG(10, ("Got KRB5 session key of length %d\n",
 766                    (int)KRB5_KEY_LENGTH(skey)));
 767
 768         *session_key = data_blob_talloc(mem_ctx,
 769                                          KRB5_KEY_DATA(skey),
 770                                          KRB5_KEY_LENGTH(skey));
 771         dump_data_pw("KRB5 Session Key:\n",
 772                      session_key->data,
 773                      session_key->length);
 774
 775         ret = true;
 776
 777 done:
 778         if (skey) {
 779                 krb5_free_keyblock(context, skey);
 780         }
 781
 782         return ret;
 783 }
 784
 785
 786 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 787  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 788
 789  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 790 {
 791         static krb5_data kdata;
 792
 793         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 794         kdata.length = strlen((const char *)kdata.data);
 795         return &kdata;
 796 }
 797 #endif
 798
 799 /* Prototypes */
 800
 801  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
 802                                        const char *client_string,       /* gd@BER.SUSE.DE */
 803                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
 804                                        time_t *expire_time)
 805 {
 806         krb5_error_code ret;
 807         krb5_context context = NULL;
 808         krb5_ccache ccache = NULL;
 809         krb5_principal client = NULL;
 810         krb5_creds creds, creds_in, *creds_out = NULL;
 811
 812         ZERO_STRUCT(creds);
 813         ZERO_STRUCT(creds_in);
 814
 815         initialize_krb5_error_table();
 816         ret = krb5_init_context(&context);
 817         if (ret) {
 818                 goto done;
 819         }
 820
 821         if (!ccache_string) {
 822                 ccache_string = krb5_cc_default_name(context);
 823         }
 824
 825         if (!ccache_string) {
 826                 ret = EINVAL;
 827                 goto done;
 828         }
 829
 830         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
 831
 832         /* FIXME: we should not fall back to defaults */
 833         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
 834         if (ret) {
 835                 goto done;
 836         }
 837
 838         if (client_string) {
 839                 ret = smb_krb5_parse_name(context, client_string, &client);
 840                 if (ret) {
 841                         goto done;
 842                 }
 843         } else {
 844                 ret = krb5_cc_get_principal(context, ccache, &client);
 845                 if (ret) {
 846                         goto done;
 847                 }
 848         }
 849
 850         ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
 851         if (ret) {
 852                 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
 853                 goto done;
 854         }
 855
 856         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
 857         ret = krb5_cc_initialize(context, ccache, client);
 858         if (ret) {
 859                 goto done;
 860         }
 861
 862         ret = krb5_cc_store_cred(context, ccache, &creds);
 863
 864         if (expire_time) {
 865                 *expire_time = (time_t) creds.times.endtime;
 866         }
 867
 868 done:
 869         krb5_free_cred_contents(context, &creds_in);
 870
 871         if (creds_out) {
 872                 krb5_free_creds(context, creds_out);
 873         } else {
 874                 krb5_free_cred_contents(context, &creds);
 875         }
 876
 877         if (client) {
 878                 krb5_free_principal(context, client);
 879         }
 880         if (ccache) {
 881                 krb5_cc_close(context, ccache);
 882         }
 883         if (context) {
 884                 krb5_free_context(context);
 885         }
 886
 887         return ret;
 888 }
 889
 890  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
 891 {
 892         krb5_error_code ret = 0;
 893         if (addr == NULL) {
 894                 return ret;
 895         }
 896 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 897         krb5_free_addresses(context, addr->addrs);
 898 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 899         ret = krb5_free_addresses(context, addr->addrs);
 900         SAFE_FREE(addr->addrs);
 901 #endif
 902         SAFE_FREE(addr);
 903         addr = NULL;
 904         return ret;
 905 }
 906
 907 #define MAX_NETBIOSNAME_LEN 16
 908  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
 909                                                    const char *netbios_name)
 910 {
 911         krb5_error_code ret = 0;
 912         char buf[MAX_NETBIOSNAME_LEN];
 913         int len;
 914 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 915         krb5_address **addrs = NULL;
 916 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 917         krb5_addresses *addrs = NULL;
 918 #endif
 919
 920         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
 921         if (*kerb_addr == NULL) {
 922                 return ENOMEM;
 923         }
 924
 925         /* temporarily duplicate put_name() code here to avoid dependency
 926          * issues for a 5 lines function */
 927         len = strlen(netbios_name);
 928         memcpy(buf, netbios_name,
 929                 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
 930         if (len < MAX_NETBIOSNAME_LEN - 1) {
 931                 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
 932         }
 933         buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
 934
 935 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 936         {
 937                 int num_addr = 2;
 938
 939                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
 940                 if (addrs == NULL) {
 941                         SAFE_FREE(*kerb_addr);
 942                         return ENOMEM;
 943                 }
 944
 945                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
 946
 947                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
 948                 if (addrs[0] == NULL) {
 949                         SAFE_FREE(addrs);
 950                         SAFE_FREE(*kerb_addr);
 951                         return ENOMEM;
 952                 }
 953
 954                 addrs[0]->magic = KV5M_ADDRESS;
 955                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
 956                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
 957                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
 958                 if (addrs[0]->contents == NULL) {
 959                         SAFE_FREE(addrs[0]);
 960                         SAFE_FREE(addrs);
 961                         SAFE_FREE(*kerb_addr);
 962                         return ENOMEM;
 963                 }
 964
 965                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
 966
 967                 addrs[1] = NULL;
 968         }
 969 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 970         {
 971                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
 972                 if (addrs == NULL) {
 973                         SAFE_FREE(*kerb_addr);
 974                         return ENOMEM;
 975                 }
 976
 977                 memset(addrs, 0, sizeof(krb5_addresses));
 978
 979                 addrs->len = 1;
 980                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
 981                 if (addrs->val == NULL) {
 982                         SAFE_FREE(addrs);
 983                         SAFE_FREE(kerb_addr);
 984                         return ENOMEM;
 985                 }
 986
 987                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
 988                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
 989                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
 990                 if (addrs->val[0].address.data == NULL) {
 991                         SAFE_FREE(addrs->val);
 992                         SAFE_FREE(addrs);
 993                         SAFE_FREE(*kerb_addr);
 994                         return ENOMEM;
 995                 }
 996
 997                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
 998         }
 999 #else
1000 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1001 #endif
1002         (*kerb_addr)->addrs = addrs;
1003
1004         return ret;
1005 }
1006
1007  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1008 {
1009 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1010         krb5_free_error_contents(context, krberror);
1011 #else /* MIT */
1012         krb5_free_error(context, krberror);
1013 #endif
1014 }
1015
1016  krb5_error_code handle_krberror_packet(krb5_context context,
1017                                         krb5_data *packet)
1018 {
1019         krb5_error_code ret;
1020         bool got_error_code = false;
1021
1022         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1023
1024 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1025         {
1026                 krb5_error krberror;
1027
1028                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1029                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1030                                 error_message(ret)));
1031                         return ret;
1032                 }
1033
1034                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1035                         ret = (krb5_error_code) krberror.error_code;
1036                         got_error_code = true;
1037                 }
1038
1039                 smb_krb5_free_error(context, &krberror);
1040         }
1041 #else /* MIT */
1042         {
1043                 krb5_error *krberror;
1044
1045                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1046                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1047                                 error_message(ret)));
1048                         return ret;
1049                 }
1050
1051                 if (krberror->e_data.data == NULL) {
1052 #if defined(ERROR_TABLE_BASE_krb5)
1053                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1054 #else
1055                         ret = (krb5_error_code)krberror->error;
1056 #endif
1057                         got_error_code = true;
1058                 }
1059                 smb_krb5_free_error(context, krberror);
1060         }
1061 #endif
1062         if (got_error_code) {
1063                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1064                         error_message(ret), ret));
1065         }
1066         return ret;
1067 }
1068
1069 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1070                                             krb5_get_init_creds_opt **opt)
1071 {
1072         /* Heimdal or modern MIT version */
1073         return krb5_get_init_creds_opt_alloc(context, opt);
1074 }
1075
1076 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1077                                 krb5_get_init_creds_opt *opt)
1078 {
1079         /* Modern MIT or Heimdal version */
1080         krb5_get_init_creds_opt_free(context, opt);
1081 }
1082
1083 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1084 {
1085         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1086 }
1087
1088 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1089                                         krb5_keytab_entry *kt_entry)
1090 {
1091 /* Try krb5_free_keytab_entry_contents first, since
1092  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1093  * krb5_kt_free_entry but only has a prototype for the first, while the
1094  * second is considered private.
1095  */
1096 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1097         return krb5_free_keytab_entry_contents(context, kt_entry);
1098 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1099         return krb5_kt_free_entry(context, kt_entry);
1100 #else
1101 #error UNKNOWN_KT_FREE_FUNCTION
1102 #endif
1103 }
1104
1105
1106 /* caller needs to free etype_s */
1107 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1108                                            krb5_enctype enctype,
1109                                            char **etype_s)
1110 {
1111 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1112         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1113 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1114         char buf[256];
1115         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1116         if (ret) {
1117                 return ret;
1118         }
1119         *etype_s = SMB_STRDUP(buf);
1120         if (!*etype_s) {
1121                 return ENOMEM;
1122         }
1123         return ret;
1124 #else
1125 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1126 #endif
1127 }
1128
1129 /**********************************************************************
1130  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1131  * allows to process non-default keytab names.
1132  * @param context krb5_context
1133  * @param keytab_name_req string
1134  * @param write_access bool if writable keytab is required
1135  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1136  * @return krb5_error_code
1137 **********************************************************************/
1138
1139 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1140 #ifndef MAX_KEYTAB_NAME_LEN
1141 #define MAX_KEYTAB_NAME_LEN 1100
1142 #endif
1143
1144 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1145                                      const char *keytab_name_req,
1146                                      bool write_access,
1147                                      krb5_keytab *keytab)
1148 {
1149         krb5_error_code ret = 0;
1150         TALLOC_CTX *mem_ctx;
1151         char keytab_string[MAX_KEYTAB_NAME_LEN];
1152         char *kt_str = NULL;
1153         bool found_valid_name = false;
1154         const char *pragma = "FILE";
1155         const char *tmp = NULL;
1156
1157         if (!write_access && !keytab_name_req) {
1158                 /* caller just wants to read the default keytab readonly, so be it */
1159                 return krb5_kt_default(context, keytab);
1160         }
1161
1162         mem_ctx = talloc_init("smb_krb5_open_keytab");
1163         if (!mem_ctx) {
1164                 return ENOMEM;
1165         }
1166
1167 #ifdef HAVE_WRFILE_KEYTAB
1168         if (write_access) {
1169                 pragma = "WRFILE";
1170         }
1171 #endif
1172
1173         if (keytab_name_req) {
1174
1175                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1176                         ret = KRB5_CONFIG_NOTENUFSPACE;
1177                         goto out;
1178                 }
1179
1180                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1181                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1182                         tmp = keytab_name_req;
1183                         goto resolve;
1184                 }
1185
1186                 if (keytab_name_req[0] != '/') {
1187                         ret = KRB5_KT_BADNAME;
1188                         goto out;
1189                 }
1190
1191                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1192                 if (!tmp) {
1193                         ret = ENOMEM;
1194                         goto out;
1195                 }
1196
1197                 goto resolve;
1198         }
1199
1200         /* we need to handle more complex keytab_strings, like:
1201          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1202
1203         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1204         if (ret) {
1205                 goto out;
1206         }
1207
1208         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1209
1210         tmp = talloc_strdup(mem_ctx, keytab_string);
1211         if (!tmp) {
1212                 ret = ENOMEM;
1213                 goto out;
1214         }
1215
1216         if (strncmp(tmp, "ANY:", 4) == 0) {
1217                 tmp += 4;
1218         }
1219
1220         memset(&keytab_string, '\0', sizeof(keytab_string));
1221
1222         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1223                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1224                         found_valid_name = true;
1225                         tmp = kt_str;
1226                         tmp += 7;
1227                 }
1228
1229                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1230                         found_valid_name = true;
1231                         tmp = kt_str;
1232                         tmp += 5;
1233                 }
1234
1235                 if (tmp[0] == '/') {
1236                         /* Treat as a FILE: keytab definition. */
1237                         found_valid_name = true;
1238                 }
1239
1240                 if (found_valid_name) {
1241                         if (tmp[0] != '/') {
1242                                 ret = KRB5_KT_BADNAME;
1243                                 goto out;
1244                         }
1245
1246                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1247                         if (!tmp) {
1248                                 ret = ENOMEM;
1249                                 goto out;
1250                         }
1251                         break;
1252                 }
1253         }
1254
1255         if (!found_valid_name) {
1256                 ret = KRB5_KT_UNKNOWN_TYPE;
1257                 goto out;
1258         }
1259
1260  resolve:
1261         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1262         ret = krb5_kt_resolve(context, tmp, keytab);
1263
1264  out:
1265         TALLOC_FREE(mem_ctx);
1266         return ret;
1267 }
1268
1269 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1270                                      krb5_context context,
1271                                      krb5_keytab keytab,
1272                                      const char **keytab_name)
1273 {
1274         char keytab_string[MAX_KEYTAB_NAME_LEN];
1275         krb5_error_code ret = 0;
1276
1277         ret = krb5_kt_get_name(context, keytab,
1278                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1279         if (ret) {
1280                 return ret;
1281         }
1282
1283         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1284         if (!*keytab_name) {
1285                 return ENOMEM;
1286         }
1287
1288         return ret;
1289 }
1290
1291 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1292     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1293     defined(HAVE_KRB5_GET_CREDS)
1294 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1295                                                              krb5_ccache ccache,
1296                                                              krb5_principal me,
1297                                                              krb5_principal server,
1298                                                              krb5_principal impersonate_princ,
1299                                                              krb5_creds **out_creds)
1300 {
1301         krb5_error_code ret;
1302         krb5_get_creds_opt opt;
1303
1304         ret = krb5_get_creds_opt_alloc(context, &opt);
1305         if (ret) {
1306                 goto done;
1307         }
1308         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1309
1310         if (impersonate_princ) {
1311                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1312                                                          impersonate_princ);
1313                 if (ret) {
1314                         goto done;
1315                 }
1316         }
1317
1318         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1319         if (ret) {
1320                 goto done;
1321         }
1322
1323  done:
1324         if (opt) {
1325                 krb5_get_creds_opt_free(context, opt);
1326         }
1327         return ret;
1328 }
1329 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1330
1331 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1332 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1333                                                          krb5_ccache ccache,
1334                                                          krb5_principal me,
1335                                                          krb5_principal server,
1336                                                          krb5_principal impersonate_princ,
1337                                                          krb5_creds **out_creds)
1338 {
1339         krb5_error_code ret;
1340         krb5_creds in_creds;
1341
1342 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1343 krb5_error_code KRB5_CALLCONV
1344 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1345                               krb5_ccache ccache, krb5_creds *in_creds,
1346                               krb5_data *subject_cert,
1347                               krb5_creds **out_creds);
1348 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1349
1350         ZERO_STRUCT(in_creds);
1351
1352         if (impersonate_princ) {
1353
1354                 in_creds.server = me;
1355                 in_creds.client = impersonate_princ;
1356
1357                 ret = krb5_get_credentials_for_user(context,
1358                                                     0, /* krb5_flags options */
1359                                                     ccache,
1360                                                     &in_creds,
1361                                                     NULL, /* krb5_data *subject_cert */
1362                                                     out_creds);
1363         } else {
1364                 in_creds.client = me;
1365                 in_creds.server = server;
1366
1367                 ret = krb5_get_credentials(context, 0, ccache,
1368                                            &in_creds, out_creds);
1369         }
1370
1371         return ret;
1372 }
1373 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1374
1375 /*
1376  * smb_krb5_get_credentials
1377  *
1378  * @brief Get krb5 credentials for a server
1379  *
1380  * @param[in] context           An initialized krb5_context
1381  * @param[in] ccache            An initialized krb5_ccache
1382  * @param[in] me                The krb5_principal of the caller
1383  * @param[in] server            The krb5_principal of the requested service
1384  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1385  * @param[out] out_creds        The returned krb5_creds structure
1386  * @return krb5_error_code
1387  *
1388  */
1389 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1390                                          krb5_ccache ccache,
1391                                          krb5_principal me,
1392                                          krb5_principal server,
1393                                          krb5_principal impersonate_princ,
1394                                          krb5_creds **out_creds)
1395 {
1396         krb5_error_code ret;
1397         krb5_creds *creds = NULL;
1398
1399         *out_creds = NULL;
1400
1401         if (impersonate_princ) {
1402 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1403                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1404 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1405                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1406 #else
1407                 ret = ENOTSUP;
1408 #endif
1409         } else {
1410                 krb5_creds in_creds;
1411
1412                 ZERO_STRUCT(in_creds);
1413
1414                 in_creds.client = me;
1415                 in_creds.server = server;
1416
1417                 ret = krb5_get_credentials(context, 0, ccache,
1418                                            &in_creds, &creds);
1419         }
1420         if (ret) {
1421                 goto done;
1422         }
1423
1424         if (out_creds) {
1425                 *out_creds = creds;
1426         }
1427
1428  done:
1429         if (creds && ret) {
1430                 krb5_free_creds(context, creds);
1431         }
1432
1433         return ret;
1434 }
1435
1436 /*
1437  * smb_krb5_get_creds
1438  *
1439  * @brief Get krb5 credentials for a server
1440  *
1441  * @param[in] server_s          The string name of the service
1442  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
1443  * @param[in] cc                The krb5 credential cache string name (optional)
1444  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
1445  * @param[out] creds_p          The returned krb5_creds structure
1446  * @return krb5_error_code
1447  *
1448  */
1449 krb5_error_code smb_krb5_get_creds(const char *server_s,
1450                                    time_t time_offset,
1451                                    const char *cc,
1452                                    const char *impersonate_princ_s,
1453                                    krb5_creds **creds_p)
1454 {
1455         krb5_error_code ret;
1456         krb5_context context = NULL;
1457         krb5_principal me = NULL;
1458         krb5_principal server = NULL;
1459         krb5_principal impersonate_princ = NULL;
1460         krb5_creds *creds = NULL;
1461         krb5_ccache ccache = NULL;
1462
1463         *creds_p = NULL;
1464
1465         initialize_krb5_error_table();
1466         ret = krb5_init_context(&context);
1467         if (ret) {
1468                 goto done;
1469         }
1470
1471         if (time_offset != 0) {
1472                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
1473         }
1474
1475         ret = krb5_cc_resolve(context, cc ? cc :
1476                 krb5_cc_default_name(context), &ccache);
1477         if (ret) {
1478                 goto done;
1479         }
1480
1481         ret = krb5_cc_get_principal(context, ccache, &me);
1482         if (ret) {
1483                 goto done;
1484         }
1485
1486         ret = smb_krb5_parse_name(context, server_s, &server);
1487         if (ret) {
1488                 goto done;
1489         }
1490
1491         if (impersonate_princ_s) {
1492                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
1493                                           &impersonate_princ);
1494                 if (ret) {
1495                         goto done;
1496                 }
1497         }
1498
1499         ret = smb_krb5_get_credentials(context, ccache,
1500                                        me, server, impersonate_princ,
1501                                        &creds);
1502         if (ret) {
1503                 goto done;
1504         }
1505
1506         ret = krb5_cc_store_cred(context, ccache, creds);
1507         if (ret) {
1508                 goto done;
1509         }
1510
1511         if (creds_p) {
1512                 *creds_p = creds;
1513         }
1514
1515         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
1516                 server_s));
1517
1518         if (impersonate_princ_s) {
1519                 char *client = NULL;
1520
1521                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
1522                 if (ret) {
1523                         goto done;
1524                 }
1525                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
1526                         client));
1527                 TALLOC_FREE(client);
1528         }
1529
1530  done:
1531         if (!context) {
1532                 return ret;
1533         }
1534
1535         if (creds && ret) {
1536                 krb5_free_creds(context, creds);
1537         }
1538         if (server) {
1539                 krb5_free_principal(context, server);
1540         }
1541         if (me) {
1542                 krb5_free_principal(context, me);
1543         }
1544         if (impersonate_princ) {
1545                 krb5_free_principal(context, impersonate_princ);
1546         }
1547         if (ccache) {
1548                 krb5_cc_close(context, ccache);
1549         }
1550         krb5_free_context(context);
1551
1552         return ret;
1553 }
1554
1555 /*
1556   simulate a kinit, putting the tgt in the given credentials cache.
1557   Orignally by remus@snapserver.com
1558
1559   This version is built to use a keyblock, rather than needing the
1560   original password.
1561
1562   The impersonate_principal is the principal if NULL, or the principal
1563   to impersonate
1564
1565   The target_service defaults to the krbtgt if NULL, but could be
1566    kpasswd/realm or the local service (if we are doing s4u2self)
1567 */
1568 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1569                                            krb5_principal principal,
1570                                            krb5_keyblock *keyblock,
1571                                            const char *target_service,
1572                                            krb5_get_init_creds_opt *krb_options,
1573                                            time_t *expire_time,
1574                                            time_t *kdc_time)
1575 {
1576         krb5_error_code code = 0;
1577         krb5_creds my_creds;
1578
1579 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1580         code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1581                                             keyblock, 0, target_service,
1582                                             krb_options);
1583 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1584 {
1585 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1586         char *tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1587         krb5_keytab_entry entry;
1588         krb5_keytab keytab;
1589
1590         memset(entry, 0, sizeof(entry));
1591         entry.principal = principal;
1592         entry.key = keyblock;
1593
1594         memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB))
1595         mktemp(tmp_name);
1596         if (tmp_name[0] == 0) {
1597                 return KRB5_KT_BADNAME;
1598         }
1599         code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1600         if (code) {
1601                 return code;
1602         }
1603
1604         code = krb5_kt_add_entry(ctx, keytab, &entry);
1605         if (code) {
1606                 (void)krb5_kt_close(ctx, keytab);
1607                 goto done;
1608         }
1609
1610         code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1611                                           keytab, 0, target_service,
1612                                           krb_options);
1613         (void)krb5_kt_close(ctx, keytab);
1614 }
1615 #else
1616 #error krb5_get_init_creds_keyblock not available!
1617 #endif
1618         if (code) {
1619                 return code;
1620         }
1621
1622         code = krb5_cc_initialize(ctx, cc, principal);
1623         if (code) {
1624                 goto done;
1625         }
1626
1627         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1628         if (code) {
1629                 goto done;
1630         }
1631
1632         if (expire_time) {
1633                 *expire_time = (time_t) my_creds.times.endtime;
1634         }
1635
1636         if (kdc_time) {
1637                 *kdc_time = (time_t) my_creds.times.starttime;
1638         }
1639
1640         code = 0;
1641 done:
1642         krb5_free_cred_contents(ctx, &my_creds);
1643         return code;
1644 }
1645
1646 /*
1647   simulate a kinit, putting the tgt in the given credentials cache.
1648   Orignally by remus@snapserver.com
1649
1650   The impersonate_principal is the principal if NULL, or the principal to
1651   impersonate
1652
1653   The self_service, should be the local service (for S4U2Self if
1654   impersonate_principal is given).
1655
1656   The target_service defaults to the krbtgt if NULL, but could be
1657   kpasswd/realm or a remote service (for S4U2Proxy)
1658
1659 */
1660 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx,
1661                                            krb5_ccache store_cc,
1662                                            krb5_principal init_principal,
1663                                            const char *init_password,
1664                                            krb5_principal impersonate_principal,
1665                                            const char *self_service,
1666                                            const char *target_service,
1667                                            krb5_get_init_creds_opt *krb_options,
1668                                            time_t *expire_time,
1669                                            time_t *kdc_time)
1670 {
1671         krb5_error_code code = 0;
1672         krb5_get_creds_opt options;
1673         krb5_principal store_principal;
1674         krb5_creds store_creds;
1675         krb5_creds *s4u2self_creds;
1676         Ticket s4u2self_ticket;
1677         size_t s4u2self_ticketlen;
1678         krb5_creds *s4u2proxy_creds;
1679         krb5_principal self_princ;
1680         bool s4u2proxy;
1681         krb5_principal target_princ;
1682         krb5_ccache tmp_cc;
1683         const char *self_realm;
1684         krb5_principal blacklist_principal = NULL;
1685         krb5_principal whitelist_principal = NULL;
1686
1687         if (impersonate_principal && self_service == NULL) {
1688                 return EINVAL;
1689         }
1690
1691         /*
1692          * If we are not impersonating, then get this ticket for the
1693          * target service, otherwise a krbtgt, and get the next ticket
1694          * for the target
1695          */
1696         code = krb5_get_init_creds_password(ctx, &store_creds,
1697                                             init_principal,
1698                                             init_password,
1699                                             NULL, NULL,
1700                                             0,
1701                                             impersonate_principal ? NULL : target_service,
1702                                             krb_options);
1703         if (code != 0) {
1704                 return code;
1705         }
1706
1707         store_principal = init_principal;
1708
1709         if (impersonate_principal == NULL) {
1710                 goto store;
1711         }
1712
1713         /*
1714          * We are trying S4U2Self now:
1715          *
1716          * As we do not want to expose our TGT in the
1717          * krb5_ccache, which is also holds the impersonated creds.
1718          *
1719          * Some low level krb5/gssapi function might use the TGT
1720          * identity and let the client act as our machine account.
1721          *
1722          * We need to avoid that and use a temporary krb5_ccache
1723          * in order to pass our TGT to the krb5_get_creds() function.
1724          */
1725         code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1726         if (code != 0) {
1727                 krb5_free_cred_contents(ctx, &store_creds);
1728                 return code;
1729         }
1730
1731         code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1732         if (code != 0) {
1733                 krb5_cc_destroy(ctx, tmp_cc);
1734                 krb5_free_cred_contents(ctx, &store_creds);
1735                 return code;
1736         }
1737
1738         code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1739         if (code != 0) {
1740                 krb5_free_cred_contents(ctx, &store_creds);
1741                 krb5_cc_destroy(ctx, tmp_cc);
1742                 return code;
1743         }
1744
1745         /*
1746          * we need to remember the client principal of our
1747          * TGT and make sure the KDC does not return this
1748          * in the impersonated tickets. This can happen
1749          * if the KDC does not support S4U2Self and S4U2Proxy.
1750          */
1751         blacklist_principal = store_creds.client;
1752         store_creds.client = NULL;
1753         krb5_free_cred_contents(ctx, &store_creds);
1754
1755         /*
1756          * Check if we also need S4U2Proxy or if S4U2Self is
1757          * enough in order to get a ticket for the target.
1758          */
1759         if (target_service == NULL) {
1760                 s4u2proxy = false;
1761         } else if (strcmp(target_service, self_service) == 0) {
1762                 s4u2proxy = false;
1763         } else {
1764                 s4u2proxy = true;
1765         }
1766
1767         /*
1768          * For S4U2Self we need our own service principal,
1769          * which belongs to our own realm (available on
1770          * our client principal).
1771          */
1772         self_realm = krb5_principal_get_realm(ctx, init_principal);
1773
1774         code = krb5_parse_name(ctx, self_service, &self_princ);
1775         if (code != 0) {
1776                 krb5_free_principal(ctx, blacklist_principal);
1777                 krb5_cc_destroy(ctx, tmp_cc);
1778                 return code;
1779         }
1780
1781         code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1782         if (code != 0) {
1783                 krb5_free_principal(ctx, blacklist_principal);
1784                 krb5_free_principal(ctx, self_princ);
1785                 krb5_cc_destroy(ctx, tmp_cc);
1786                 return code;
1787         }
1788
1789         code = krb5_get_creds_opt_alloc(ctx, &options);
1790         if (code != 0) {
1791                 krb5_free_principal(ctx, blacklist_principal);
1792                 krb5_free_principal(ctx, self_princ);
1793                 krb5_cc_destroy(ctx, tmp_cc);
1794                 return code;
1795         }
1796
1797         if (s4u2proxy) {
1798                 /*
1799                  * If we want S4U2Proxy, we need the forwardable flag
1800                  * on the S4U2Self ticket.
1801                  */
1802                 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1803         }
1804
1805         code = krb5_get_creds_opt_set_impersonate(ctx, options,
1806                                                   impersonate_principal);
1807         if (code != 0) {
1808                 krb5_get_creds_opt_free(ctx, options);
1809                 krb5_free_principal(ctx, blacklist_principal);
1810                 krb5_free_principal(ctx, self_princ);
1811                 krb5_cc_destroy(ctx, tmp_cc);
1812                 return code;
1813         }
1814
1815         code = krb5_get_creds(ctx, options, tmp_cc,
1816                               self_princ, &s4u2self_creds);
1817         krb5_get_creds_opt_free(ctx, options);
1818         krb5_free_principal(ctx, self_princ);
1819         if (code != 0) {
1820                 krb5_free_principal(ctx, blacklist_principal);
1821                 krb5_cc_destroy(ctx, tmp_cc);
1822                 return code;
1823         }
1824
1825         if (!s4u2proxy) {
1826                 krb5_cc_destroy(ctx, tmp_cc);
1827
1828                 /*
1829                  * Now make sure we store the impersonated principal
1830                  * and creds instead of the TGT related stuff
1831                  * in the krb5_ccache of the caller.
1832                  */
1833                 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1834                                                 &store_creds);
1835                 krb5_free_creds(ctx, s4u2self_creds);
1836                 if (code != 0) {
1837                         return code;
1838                 }
1839
1840                 /*
1841                  * It's important to store the principal the KDC
1842                  * returned, as otherwise the caller would not find
1843                  * the S4U2Self ticket in the krb5_ccache lookup.
1844                  */
1845                 store_principal = store_creds.client;
1846                 goto store;
1847         }
1848
1849         /*
1850          * We are trying S4U2Proxy:
1851          *
1852          * We need the ticket from the S4U2Self step
1853          * and our TGT in order to get the delegated ticket.
1854          */
1855         code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1856                              s4u2self_creds->ticket.length,
1857                              &s4u2self_ticket,
1858                              &s4u2self_ticketlen);
1859         if (code != 0) {
1860                 krb5_free_creds(ctx, s4u2self_creds);
1861                 krb5_free_principal(ctx, blacklist_principal);
1862                 krb5_cc_destroy(ctx, tmp_cc);
1863                 return code;
1864         }
1865
1866         /*
1867          * we need to remember the client principal of the
1868          * S4U2Self stage and as it needs to match the one we
1869          * will get for the S4U2Proxy stage. We need this
1870          * in order to detect KDCs which does not support S4U2Proxy.
1871          */
1872         whitelist_principal = s4u2self_creds->client;
1873         s4u2self_creds->client = NULL;
1874         krb5_free_creds(ctx, s4u2self_creds);
1875
1876         /*
1877          * For S4U2Proxy we also got a target service principal,
1878          * which also belongs to our own realm (available on
1879          * our client principal).
1880          */
1881         code = krb5_parse_name(ctx, target_service, &target_princ);
1882         if (code != 0) {
1883                 free_Ticket(&s4u2self_ticket);
1884                 krb5_free_principal(ctx, whitelist_principal);
1885                 krb5_free_principal(ctx, blacklist_principal);
1886                 krb5_cc_destroy(ctx, tmp_cc);
1887                 return code;
1888         }
1889
1890         code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1891         if (code != 0) {
1892                 free_Ticket(&s4u2self_ticket);
1893                 krb5_free_principal(ctx, target_princ);
1894                 krb5_free_principal(ctx, whitelist_principal);
1895                 krb5_free_principal(ctx, blacklist_principal);
1896                 krb5_cc_destroy(ctx, tmp_cc);
1897                 return code;
1898         }
1899
1900         code = krb5_get_creds_opt_alloc(ctx, &options);
1901         if (code != 0) {
1902                 free_Ticket(&s4u2self_ticket);
1903                 krb5_free_principal(ctx, target_princ);
1904                 krb5_free_principal(ctx, whitelist_principal);
1905                 krb5_free_principal(ctx, blacklist_principal);
1906                 krb5_cc_destroy(ctx, tmp_cc);
1907                 return code;
1908         }
1909
1910         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1911         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1912
1913         code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1914         free_Ticket(&s4u2self_ticket);
1915         if (code != 0) {
1916                 krb5_get_creds_opt_free(ctx, options);
1917                 krb5_free_principal(ctx, target_princ);
1918                 krb5_free_principal(ctx, whitelist_principal);
1919                 krb5_free_principal(ctx, blacklist_principal);
1920                 krb5_cc_destroy(ctx, tmp_cc);
1921                 return code;
1922         }
1923
1924         code = krb5_get_creds(ctx, options, tmp_cc,
1925                               target_princ, &s4u2proxy_creds);
1926         krb5_get_creds_opt_free(ctx, options);
1927         krb5_free_principal(ctx, target_princ);
1928         krb5_cc_destroy(ctx, tmp_cc);
1929         if (code != 0) {
1930                 krb5_free_principal(ctx, whitelist_principal);
1931                 krb5_free_principal(ctx, blacklist_principal);
1932                 return code;
1933         }
1934
1935         /*
1936          * Now make sure we store the impersonated principal
1937          * and creds instead of the TGT related stuff
1938          * in the krb5_ccache of the caller.
1939          */
1940         code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
1941                                         &store_creds);
1942         krb5_free_creds(ctx, s4u2proxy_creds);
1943         if (code != 0) {
1944                 krb5_free_principal(ctx, whitelist_principal);
1945                 krb5_free_principal(ctx, blacklist_principal);
1946                 return code;
1947         }
1948
1949         /*
1950          * It's important to store the principal the KDC
1951          * returned, as otherwise the caller would not find
1952          * the S4U2Self ticket in the krb5_ccache lookup.
1953          */
1954         store_principal = store_creds.client;
1955
1956  store:
1957         if (blacklist_principal &&
1958             krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
1959                 char *sp = NULL;
1960                 char *ip = NULL;
1961
1962                 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
1963                 if (code != 0) {
1964                         sp = NULL;
1965                 }
1966                 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
1967                 if (code != 0) {
1968                         ip = NULL;
1969                 }
1970                 DEBUG(1, ("kerberos_kinit_password_cc: "
1971                           "KDC returned self principal[%s] while impersonating [%s]\n",
1972                           sp?sp:"<no memory>",
1973                           ip?ip:"<no memory>"));
1974
1975                 SAFE_FREE(sp);
1976                 SAFE_FREE(ip);
1977
1978                 krb5_free_principal(ctx, whitelist_principal);
1979                 krb5_free_principal(ctx, blacklist_principal);
1980                 krb5_free_cred_contents(ctx, &store_creds);
1981                 return KRB5_FWD_BAD_PRINCIPAL;
1982         }
1983         if (blacklist_principal) {
1984                 krb5_free_principal(ctx, blacklist_principal);
1985         }
1986
1987         if (whitelist_principal &&
1988             !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
1989                 char *sp = NULL;
1990                 char *ep = NULL;
1991
1992                 code = krb5_unparse_name(ctx, store_creds.client, &sp);
1993                 if (code != 0) {
1994                         sp = NULL;
1995                 }
1996                 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
1997                 if (code != 0) {
1998                         ep = NULL;
1999                 }
2000                 DEBUG(1, ("kerberos_kinit_password_cc: "
2001                           "KDC returned wrong principal[%s] we expected [%s]\n",
2002                           sp?sp:"<no memory>",
2003                           ep?ep:"<no memory>"));
2004
2005                 SAFE_FREE(sp);
2006                 SAFE_FREE(ep);
2007
2008                 krb5_free_principal(ctx, whitelist_principal);
2009                 krb5_free_cred_contents(ctx, &store_creds);
2010                 return KRB5_FWD_BAD_PRINCIPAL;
2011         }
2012         if (whitelist_principal) {
2013                 krb5_free_principal(ctx, whitelist_principal);
2014         }
2015
2016         code = krb5_cc_initialize(ctx, store_cc, store_principal);
2017         if (code != 0) {
2018                 krb5_free_cred_contents(ctx, &store_creds);
2019                 return code;
2020         }
2021
2022         code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2023         if (code != 0) {
2024                 krb5_free_cred_contents(ctx, &store_creds);
2025                 return code;
2026         }
2027
2028         if (expire_time) {
2029                 *expire_time = (time_t) store_creds.times.endtime;
2030         }
2031
2032         if (kdc_time) {
2033                 *kdc_time = (time_t) store_creds.times.starttime;
2034         }
2035
2036         krb5_free_cred_contents(ctx, &store_creds);
2037
2038         return 0;
2039 }
2040
2041 /*
2042  * smb_krb5_principal_get_realm
2043  *
2044  * @brief Get realm of a principal
2045  *
2046  * @param[in] context           The krb5_context
2047  * @param[in] principal         The principal
2048  * @return pointer to the realm
2049  *
2050  */
2051
2052 char *smb_krb5_principal_get_realm(krb5_context context,
2053                                    krb5_principal principal)
2054 {
2055 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2056         return discard_const_p(char, krb5_principal_get_realm(context, principal));
2057 #elif defined(krb5_princ_realm) /* MIT */
2058         krb5_data *realm;
2059         realm = krb5_princ_realm(context, principal);
2060         return discard_const_p(char, realm->data);
2061 #else
2062         return NULL;
2063 #endif
2064 }
2065
2066 /************************************************************************
2067  Routine to get the default realm from the kerberos credentials cache.
2068  Caller must free if the return value is not NULL.
2069 ************************************************************************/
2070
2071 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2072 {
2073         char *realm = NULL;
2074         krb5_context ctx = NULL;
2075         krb5_ccache cc = NULL;
2076         krb5_principal princ = NULL;
2077
2078         initialize_krb5_error_table();
2079         if (krb5_init_context(&ctx)) {
2080                 return NULL;
2081         }
2082
2083         DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2084                 "Trying to read krb5 cache: %s\n",
2085                 krb5_cc_default_name(ctx)));
2086         if (krb5_cc_default(ctx, &cc)) {
2087                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2088                         "failed to read default cache\n"));
2089                 goto out;
2090         }
2091         if (krb5_cc_get_principal(ctx, cc, &princ)) {
2092                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2093                         "failed to get default principal\n"));
2094                 goto out;
2095         }
2096
2097 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2098         realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2099 #elif defined(HAVE_KRB5_PRINC_REALM)
2100         {
2101                 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2102                 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2103         }
2104 #endif
2105
2106   out:
2107
2108         if (ctx) {
2109                 if (princ) {
2110                         krb5_free_principal(ctx, princ);
2111                 }
2112                 if (cc) {
2113                         krb5_cc_close(ctx, cc);
2114                 }
2115                 krb5_free_context(ctx);
2116         }
2117
2118         return realm;
2119 }
2120
2121 /************************************************************************
2122  Routine to get the realm from a given DNS name.
2123 ************************************************************************/
2124
2125 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2126                                                 const char *hostname)
2127 {
2128 #if defined(HAVE_KRB5_REALM_TYPE)
2129         /* Heimdal. */
2130         krb5_realm *realm_list = NULL;
2131 #else
2132         /* MIT */
2133         char **realm_list = NULL;
2134 #endif
2135         char *realm = NULL;
2136         krb5_error_code kerr;
2137         krb5_context ctx = NULL;
2138
2139         initialize_krb5_error_table();
2140         if (krb5_init_context(&ctx)) {
2141                 return NULL;
2142         }
2143
2144         kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2145         if (kerr != 0) {
2146                 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2147                         "failed %s\n",
2148                         hostname ? hostname : "(NULL)",
2149                         error_message(kerr) ));
2150                 goto out;
2151         }
2152
2153         if (realm_list && realm_list[0]) {
2154                 realm = talloc_strdup(mem_ctx, realm_list[0]);
2155         }
2156
2157   out:
2158
2159         if (ctx) {
2160                 if (realm_list) {
2161                         krb5_free_host_realm(ctx, realm_list);
2162                         realm_list = NULL;
2163                 }
2164                 krb5_free_context(ctx);
2165                 ctx = NULL;
2166         }
2167         return realm;
2168 }
2169
2170 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2171                                                    const char *service,
2172                                                    const char *remote_name,
2173                                                    const char *default_realm)
2174 {
2175         char *realm = NULL;
2176         char *host = NULL;
2177         char *principal;
2178         host = strchr_m(remote_name, '.');
2179         if (host) {
2180                 /* DNS name. */
2181                 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2182                                                          remote_name);
2183         } else {
2184                 /* NetBIOS name - use our realm. */
2185                 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2186         }
2187
2188         if (realm == NULL || *realm == '\0') {
2189                 realm = talloc_strdup(talloc_tos(), default_realm);
2190                 if (!realm) {
2191                         return NULL;
2192                 }
2193                 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2194                          "cannot get realm from, "
2195                          "desthost %s or default ccache. Using default "
2196                          "smb.conf realm %s\n",
2197                          remote_name,
2198                          realm));
2199         }
2200
2201         principal = talloc_asprintf(mem_ctx,
2202                                     "%s/%s@%s",
2203                                     service, remote_name,
2204                                     realm);
2205         TALLOC_FREE(realm);
2206         return principal;
2207 }
2208
2209 char *smb_get_krb5_error_message(krb5_context context,
2210                                  krb5_error_code code,
2211                                  TALLOC_CTX *mem_ctx)
2212 {
2213         char *ret;
2214
2215 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2216         const char *context_error = krb5_get_error_message(context, code);
2217         if (context_error) {
2218                 ret = talloc_asprintf(mem_ctx, "%s: %s",
2219                                         error_message(code), context_error);
2220                 krb5_free_error_message(context, context_error);
2221                 return ret;
2222         }
2223 #endif
2224         ret = talloc_strdup(mem_ctx, error_message(code));
2225         return ret;
2226 }
2227
2228 #else /* HAVE_KRB5 */
2229  /* this saves a few linking headaches */
2230  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2231                         const char *principal, time_t time_offset,
2232                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2233                         uint32_t extra_ap_opts,
2234                         const char *ccname, time_t *tgs_expire,
2235                         const char *impersonate_princ_s)
2236 {
2237          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2238          return 1;
2239 }
2240
2241 #endif /* HAVE_KRB5 */