source3/libsmb/clikrb5.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 "smb_krb5.h"
  25 #include "../librpc/gen_ndr/krb5pac.h"
  26 #include "../lib/util/asn1.h"
  27 #include "libsmb/nmblib.h"
  28
  29 #ifndef KRB5_AUTHDATA_WIN2K_PAC
  30 #define KRB5_AUTHDATA_WIN2K_PAC 128
  31 #endif
  32
  33 #ifndef KRB5_AUTHDATA_IF_RELEVANT
  34 #define KRB5_AUTHDATA_IF_RELEVANT 1
  35 #endif
  36
  37 #ifdef HAVE_KRB5
  38
  39 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  40 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  41 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
  42                                                         bind field, flags field. */
  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 #ifndef HAVE_KRB5_SET_REAL_TIME
  54 /*
  55  * This function is not in the Heimdal mainline.
  56  */
  57  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
  58 {
  59         krb5_error_code ret;
  60         int32_t sec, usec;
  61
  62         ret = krb5_us_timeofday(context, &sec, &usec);
  63         if (ret)
  64                 return ret;
  65
  66         context->kdc_sec_offset = seconds - sec;
  67         context->kdc_usec_offset = microseconds - usec;
  68
  69         return 0;
  70 }
  71 #endif
  72
  73 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
  74
  75 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
  76
  77 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
  78  * to krb5_set_default_tgs_ktypes. See
  79  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
  80  *
  81  * If the MIT libraries are not exporting internal symbols, we will end up in
  82  * this branch, which is correct. Otherwise we will continue to use the
  83  * internal symbol
  84  */
  85  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  86 {
  87     return krb5_set_default_tgs_enctypes(ctx, enc);
  88 }
  89
  90 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
  91
  92 /* Heimdal */
  93  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  94 {
  95         return krb5_set_default_in_tkt_etypes(ctx, enc);
  96 }
  97
  98 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
  99
 100 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 101
 102 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 103 /* HEIMDAL */
 104  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 105 {
 106         memset(pkaddr, '\0', sizeof(krb5_address));
 107 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 108         if (paddr->ss_family == AF_INET6) {
 109                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 110                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 111                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 112                 return true;
 113         }
 114 #endif
 115         if (paddr->ss_family == AF_INET) {
 116                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 117                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 118                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 119                 return true;
 120         }
 121         return false;
 122 }
 123 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 124 /* MIT */
 125  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 126 {
 127         memset(pkaddr, '\0', sizeof(krb5_address));
 128 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 129         if (paddr->ss_family == AF_INET6) {
 130                 pkaddr->addrtype = ADDRTYPE_INET6;
 131                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 132                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 133                 return true;
 134         }
 135 #endif
 136         if (paddr->ss_family == AF_INET) {
 137                 pkaddr->addrtype = ADDRTYPE_INET;
 138                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 139                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 140                 return true;
 141         }
 142         return false;
 143 }
 144 #else
 145 #error UNKNOWN_ADDRTYPE
 146 #endif
 147
 148  int create_kerberos_key_from_string(krb5_context context,
 149                                         krb5_principal host_princ,
 150                                         krb5_data *password,
 151                                         krb5_keyblock *key,
 152                                         krb5_enctype enctype,
 153                                         bool no_salt)
 154 {
 155         krb5_principal salt_princ = NULL;
 156         int ret;
 157         /*
 158          * Check if we've determined that the KDC is salting keys for this
 159          * principal/enctype in a non-obvious way.  If it is, try to match
 160          * its behavior.
 161          */
 162         if (no_salt) {
 163                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 164                 if (!KRB5_KEY_DATA(key)) {
 165                         return ENOMEM;
 166                 }
 167                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 168                 KRB5_KEY_LENGTH(key) = password->length;
 169                 KRB5_KEY_TYPE(key) = enctype;
 170                 return 0;
 171         }
 172         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 173         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 174         if (salt_princ) {
 175                 krb5_free_principal(context, salt_princ);
 176         }
 177         return ret;
 178 }
 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 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 254 {
 255         DATA_BLOB pac_contents;
 256         ASN1_DATA *data;
 257         int data_type;
 258
 259         if (!auth_data->length) {
 260                 return False;
 261         }
 262
 263         data = asn1_init(mem_ctx);
 264         if (data == NULL) {
 265                 return false;
 266         }
 267
 268         asn1_load(data, *auth_data);
 269         asn1_start_tag(data, ASN1_SEQUENCE(0));
 270         asn1_start_tag(data, ASN1_SEQUENCE(0));
 271         asn1_start_tag(data, ASN1_CONTEXT(0));
 272         asn1_read_Integer(data, &data_type);
 273
 274         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 275                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 276                 asn1_free(data);
 277                 return False;
 278         }
 279
 280         asn1_end_tag(data);
 281         asn1_start_tag(data, ASN1_CONTEXT(1));
 282         asn1_read_OctetString(data, talloc_tos(), &pac_contents);
 283         asn1_end_tag(data);
 284         asn1_end_tag(data);
 285         asn1_end_tag(data);
 286         asn1_free(data);
 287
 288         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 289
 290         data_blob_free(&pac_contents);
 291
 292         return True;
 293 }
 294
 295  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 296 {
 297         DATA_BLOB auth_data_wrapped;
 298         bool got_auth_data_pac = False;
 299         int i;
 300
 301 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 302         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 303             tkt->enc_part2->authorization_data[0] &&
 304             tkt->enc_part2->authorization_data[0]->length)
 305         {
 306                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 307
 308                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 309                             KRB5_AUTHDATA_IF_RELEVANT) {
 310                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 311                                         tkt->enc_part2->authorization_data[i]->ad_type));
 312                                 continue;
 313                         }
 314
 315                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 316                                                       tkt->enc_part2->authorization_data[i]->length);
 317
 318                         /* check if it is a PAC */
 319                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 320                         data_blob_free(&auth_data_wrapped);
 321
 322                         if (got_auth_data_pac) {
 323                                 return true;
 324                         }
 325                 }
 326
 327                 return got_auth_data_pac;
 328         }
 329
 330 #else
 331         if (tkt->ticket.authorization_data &&
 332             tkt->ticket.authorization_data->len)
 333         {
 334                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 335
 336                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 337                             KRB5_AUTHDATA_IF_RELEVANT) {
 338                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 339                                         tkt->ticket.authorization_data->val[i].ad_type));
 340                                 continue;
 341                         }
 342
 343                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 344                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 345
 346                         /* check if it is a PAC */
 347                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 348                         data_blob_free(&auth_data_wrapped);
 349
 350                         if (got_auth_data_pac) {
 351                                 return true;
 352                         }
 353                 }
 354
 355                 return got_auth_data_pac;
 356         }
 357 #endif
 358         return False;
 359 }
 360
 361  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 362 {
 363 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 364         return tkt->enc_part2->client;
 365 #else
 366         return tkt->client;
 367 #endif
 368 }
 369
 370 #if !defined(HAVE_KRB5_LOCATE_KDC)
 371
 372 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 373  * to a public interface for this functionality, so we have to be able to live
 374  * without it if the MIT libraries are hiding their internal symbols.
 375  */
 376
 377 #if defined(KRB5_KRBHST_INIT)
 378 /* Heimdal */
 379  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 380 {
 381         krb5_krbhst_handle hnd;
 382         krb5_krbhst_info *hinfo;
 383         krb5_error_code rc;
 384         int num_kdcs, i;
 385         struct sockaddr *sa;
 386         struct addrinfo *ai;
 387
 388         *addr_pp = NULL;
 389         *naddrs = 0;
 390
 391         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 392         if (rc) {
 393                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 394                 return rc;
 395         }
 396
 397         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 398                 ;
 399
 400         krb5_krbhst_reset(ctx, hnd);
 401
 402         if (!num_kdcs) {
 403                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 404                 krb5_krbhst_free(ctx, hnd);
 405                 return -1;
 406         }
 407
 408         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 409         if (!sa) {
 410                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 411                 krb5_krbhst_free(ctx, hnd);
 412                 naddrs = 0;
 413                 return -1;
 414         }
 415
 416         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 417
 418         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 419
 420 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 421                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 422                 if (rc) {
 423                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 424                         continue;
 425                 }
 426 #endif
 427                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 428                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 429         }
 430
 431         krb5_krbhst_free(ctx, hnd);
 432
 433         *naddrs = num_kdcs;
 434         *addr_pp = sa;
 435         return 0;
 436 }
 437
 438 #else /* ! defined(KRB5_KRBHST_INIT) */
 439
 440  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 441                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 442 {
 443         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 444         return KRB5_KDC_UNREACH;
 445 }
 446
 447 #endif /* KRB5_KRBHST_INIT */
 448
 449 #else /* ! HAVE_KRB5_LOCATE_KDC */
 450
 451  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 452                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 453 {
 454         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 455 }
 456
 457 #endif /* HAVE_KRB5_LOCATE_KDC */
 458
 459  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 460 {
 461 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 462         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 463 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 464         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 465 #else
 466 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 467 #endif
 468 }
 469
 470  bool kerberos_compatible_enctypes(krb5_context context,
 471                                   krb5_enctype enctype1,
 472                                   krb5_enctype enctype2)
 473 {
 474         krb5_boolean similar = 0;
 475
 476         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 477         return similar ? True : False;
 478 }
 479
 480 static bool ads_cleanup_expired_creds(krb5_context context,
 481                                       krb5_ccache  ccache,
 482                                       krb5_creds  *credsp)
 483 {
 484         krb5_error_code retval;
 485         const char *cc_type = krb5_cc_get_type(context, ccache);
 486
 487         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 488                   cc_type, krb5_cc_get_name(context, ccache),
 489                   http_timestring(talloc_tos(), credsp->times.endtime)));
 490
 491         /* we will probably need new tickets if the current ones
 492            will expire within 10 seconds.
 493         */
 494         if (credsp->times.endtime >= (time(NULL) + 10))
 495                 return False;
 496
 497         /* heimdal won't remove creds from a file ccache, and
 498            perhaps we shouldn't anyway, since internally we
 499            use memory ccaches, and a FILE one probably means that
 500            we're using creds obtained outside of our exectuable
 501         */
 502         if (strequal(cc_type, "FILE")) {
 503                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 504                 return False;
 505         }
 506
 507         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 508         if (retval) {
 509                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 510                           error_message(retval)));
 511                 /* If we have an error in this, we want to display it,
 512                    but continue as though we deleted it */
 513         }
 514         return True;
 515 }
 516
 517 /* Allocate and setup the auth context into the state we need. */
 518
 519 static krb5_error_code setup_auth_context(krb5_context context,
 520                         krb5_auth_context *auth_context)
 521 {
 522         krb5_error_code retval;
 523
 524         retval = krb5_auth_con_init(context, auth_context );
 525         if (retval) {
 526                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 527                         error_message(retval)));
 528                 return retval;
 529         }
 530
 531         /* Ensure this is an addressless ticket. */
 532         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 533         if (retval) {
 534                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 535                         error_message(retval)));
 536         }
 537
 538         return retval;
 539 }
 540
 541 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 542 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 543                                                 uint32_t gss_flags)
 544 {
 545         unsigned int orig_length = in_data->length;
 546         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 547         char *gss_cksum = NULL;
 548
 549         if (orig_length) {
 550                 /* Extra length field for delgated ticket. */
 551                 base_cksum_size += 4;
 552         }
 553
 554         if ((unsigned int)base_cksum_size + orig_length <
 555                         (unsigned int)base_cksum_size) {
 556                 return EINVAL;
 557         }
 558
 559         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 560         if (gss_cksum == NULL) {
 561                 return ENOMEM;
 562         }
 563
 564         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 565         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 566
 567         /*
 568          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 569          * This matches the behavior of heimdal and mit.
 570          *
 571          * And it is needed to work against some closed source
 572          * SMB servers.
 573          *
 574          * See bug #7883
 575          */
 576         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 577
 578         SIVAL(gss_cksum, 20, gss_flags);
 579
 580         if (orig_length) {
 581                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 582                 SSVAL(gss_cksum, 26, orig_length);
 583                 /* Copy the kerberos KRB_CRED data */
 584                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 585                 free(in_data->data);
 586                 in_data->data = NULL;
 587                 in_data->length = 0;
 588         }
 589         in_data->data = gss_cksum;
 590         in_data->length = base_cksum_size + orig_length;
 591         return 0;
 592 }
 593 #endif
 594
 595 /*
 596   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 597 */
 598 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 599                                        krb5_auth_context *auth_context,
 600                                        const krb5_flags ap_req_options,
 601                                        const char *principal,
 602                                        krb5_ccache ccache,
 603                                        krb5_data *outbuf,
 604                                        time_t *expire_time,
 605                                        const char *impersonate_princ_s)
 606 {
 607         krb5_error_code           retval;
 608         krb5_principal    server;
 609         krb5_principal impersonate_princ = NULL;
 610         krb5_creds              * credsp;
 611         krb5_creds                creds;
 612         krb5_data in_data;
 613         bool creds_ready = False;
 614         int i = 0, maxtries = 3;
 615
 616         ZERO_STRUCT(in_data);
 617
 618         retval = smb_krb5_parse_name(context, principal, &server);
 619         if (retval) {
 620                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 621                 return retval;
 622         }
 623
 624         if (impersonate_princ_s) {
 625                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 626                                              &impersonate_princ);
 627                 if (retval) {
 628                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 629                         goto cleanup_princ;
 630                 }
 631         }
 632
 633         /* obtain ticket & session key */
 634         ZERO_STRUCT(creds);
 635         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 636                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 637                          error_message(retval)));
 638                 goto cleanup_princ;
 639         }
 640
 641         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 642                 /* This can commonly fail on smbd startup with no ticket in the cache.
 643                  * Report at higher level than 1. */
 644                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 645                          error_message(retval)));
 646                 goto cleanup_creds;
 647         }
 648
 649         while (!creds_ready && (i < maxtries)) {
 650
 651                 if ((retval = smb_krb5_get_credentials(context, ccache,
 652                                                        creds.client,
 653                                                        creds.server,
 654                                                        impersonate_princ,
 655                                                        &credsp))) {
 656                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 657                                 principal, error_message(retval)));
 658                         goto cleanup_creds;
 659                 }
 660
 661                 /* cope with ticket being in the future due to clock skew */
 662                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 663                         time_t t = time(NULL);
 664                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 665                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 666                         krb5_set_real_time(context, t + time_offset + 1, 0);
 667                 }
 668
 669                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 670                         creds_ready = True;
 671                 }
 672
 673                 i++;
 674         }
 675
 676         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 677                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 678                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 679                   (unsigned)credsp->times.endtime));
 680
 681         if (expire_time) {
 682                 *expire_time = (time_t)credsp->times.endtime;
 683         }
 684
 685         /* Allocate the auth_context. */
 686         retval = setup_auth_context(context, auth_context);
 687         if (retval) {
 688                 DEBUG(1,("setup_auth_context failed (%s)\n",
 689                         error_message(retval)));
 690                 goto cleanup_creds;
 691         }
 692
 693 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 694         {
 695                 uint32_t gss_flags = 0;
 696
 697                 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 698                         /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 699                          as part of the kerberos exchange. */
 700
 701                         DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 702
 703                         retval = krb5_auth_con_setuseruserkey(context,
 704                                         *auth_context,
 705                                         &credsp->keyblock );
 706                         if (retval) {
 707                                 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 708                                         error_message(retval)));
 709                                 goto cleanup_creds;
 710                         }
 711
 712                         /* Must use a subkey for forwarded tickets. */
 713                         retval = krb5_auth_con_setflags(context,
 714                                 *auth_context,
 715                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 716                         if (retval) {
 717                                 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 718                                         error_message(retval)));
 719                                 goto cleanup_creds;
 720                         }
 721
 722                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 723                                 *auth_context,  /* Authentication context [in] */
 724                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 725                                 credsp->client, /* Client principal for the tgt [in] */
 726                                 credsp->server, /* Server principal for the tgt [in] */
 727                                 ccache,         /* Credential cache to use for storage [in] */
 728                                 1,              /* Turn on for "Forwardable ticket" [in] */
 729                                 &in_data );     /* Resulting response [out] */
 730
 731                         if (retval) {
 732                                 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 733                                            error_message( retval ) ) );
 734
 735                                 /*
 736                                  * This is not fatal. Delete the *auth_context and continue
 737                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
 738                                  */
 739
 740                                 if (in_data.data) {
 741                                         free( in_data.data );
 742                                         in_data.data = NULL;
 743                                         in_data.length = 0;
 744                                 }
 745                                 krb5_auth_con_free(context, *auth_context);
 746                                 *auth_context = NULL;
 747                                 retval = setup_auth_context(context, auth_context);
 748                                 if (retval) {
 749                                         DEBUG(1,("setup_auth_context failed (%s)\n",
 750                                                 error_message(retval)));
 751                                         goto cleanup_creds;
 752                                 }
 753                         } else {
 754                                 /* We got a delegated ticket. */
 755                                 gss_flags |= GSS_C_DELEG_FLAG;
 756                         }
 757                 }
 758
 759                 /* Frees and reallocates in_data into a GSS checksum blob. */
 760                 retval = create_gss_checksum(&in_data, gss_flags);
 761                 if (retval) {
 762                         goto cleanup_data;
 763                 }
 764
 765                 /* We always want GSS-checksum types. */
 766                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 767                 if (retval) {
 768                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 769                                 error_message(retval)));
 770                         goto cleanup_data;
 771                 }
 772         }
 773 #endif
 774
 775         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 776                                       &in_data, credsp, outbuf);
 777         if (retval) {
 778                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 779                          error_message(retval)));
 780         }
 781
 782 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 783 cleanup_data:
 784 #endif
 785
 786         if (in_data.data) {
 787                 free( in_data.data );
 788                 in_data.length = 0;
 789         }
 790
 791         krb5_free_creds(context, credsp);
 792
 793 cleanup_creds:
 794         krb5_free_cred_contents(context, &creds);
 795
 796 cleanup_princ:
 797         krb5_free_principal(context, server);
 798         if (impersonate_princ) {
 799                 krb5_free_principal(context, impersonate_princ);
 800         }
 801
 802         return retval;
 803 }
 804
 805 /*
 806   get a kerberos5 ticket for the given service
 807 */
 808 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 809                         const char *principal, time_t time_offset,
 810                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 811                         uint32_t extra_ap_opts, const char *ccname,
 812                         time_t *tgs_expire,
 813                         const char *impersonate_princ_s)
 814
 815 {
 816         krb5_error_code retval;
 817         krb5_data packet;
 818         krb5_context context = NULL;
 819         krb5_ccache ccdef = NULL;
 820         krb5_auth_context auth_context = NULL;
 821         krb5_enctype enc_types[] = {
 822                 ENCTYPE_ARCFOUR_HMAC,
 823                 ENCTYPE_DES_CBC_MD5,
 824                 ENCTYPE_DES_CBC_CRC,
 825                 ENCTYPE_NULL};
 826
 827         initialize_krb5_error_table();
 828         retval = krb5_init_context(&context);
 829         if (retval) {
 830                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 831                          error_message(retval)));
 832                 goto failed;
 833         }
 834
 835         if (time_offset != 0) {
 836                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 837         }
 838
 839         if ((retval = krb5_cc_resolve(context, ccname ?
 840                         ccname : krb5_cc_default_name(context), &ccdef))) {
 841                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 842                          error_message(retval)));
 843                 goto failed;
 844         }
 845
 846         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 847                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 848                          error_message(retval)));
 849                 goto failed;
 850         }
 851
 852         retval = ads_krb5_mk_req(context, &auth_context,
 853                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 854                                 principal, ccdef, &packet,
 855                                 tgs_expire, impersonate_princ_s);
 856         if (retval) {
 857                 goto failed;
 858         }
 859
 860         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 861                                  session_key_krb5, false);
 862
 863         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 864
 865         kerberos_free_data_contents(context, &packet);
 866
 867 failed:
 868
 869         if (context) {
 870                 if (ccdef)
 871                         krb5_cc_close(context, ccdef);
 872                 if (auth_context)
 873                         krb5_auth_con_free(context, auth_context);
 874                 krb5_free_context(context);
 875         }
 876
 877         return retval;
 878 }
 879
 880 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 881                               krb5_context context,
 882                               krb5_auth_context auth_context,
 883                               DATA_BLOB *session_key, bool remote)
 884 {
 885         krb5_keyblock *skey = NULL;
 886         krb5_error_code err = 0;
 887         bool ret = false;
 888
 889         if (remote) {
 890                 err = krb5_auth_con_getremotesubkey(context,
 891                                                     auth_context, &skey);
 892         } else {
 893                 err = krb5_auth_con_getlocalsubkey(context,
 894                                                    auth_context, &skey);
 895         }
 896
 897         if (err || skey == NULL) {
 898                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 899                 goto done;
 900         }
 901
 902         DEBUG(10, ("Got KRB5 session key of length %d\n",
 903                    (int)KRB5_KEY_LENGTH(skey)));
 904
 905         *session_key = data_blob_talloc(mem_ctx,
 906                                          KRB5_KEY_DATA(skey),
 907                                          KRB5_KEY_LENGTH(skey));
 908         dump_data_pw("KRB5 Session Key:\n",
 909                      session_key->data,
 910                      session_key->length);
 911
 912         ret = true;
 913
 914 done:
 915         if (skey) {
 916                 krb5_free_keyblock(context, skey);
 917         }
 918
 919         return ret;
 920 }
 921
 922
 923 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 924  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 925
 926  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 927 {
 928         static krb5_data kdata;
 929
 930         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 931         kdata.length = strlen((const char *)kdata.data);
 932         return &kdata;
 933 }
 934 #endif
 935
 936  time_t get_authtime_from_tkt(krb5_ticket *tkt)
 937 {
 938 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 939         return tkt->enc_part2->times.authtime;
 940 #else
 941         return tkt->ticket.authtime;
 942 #endif
 943 }
 944
 945 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
 946 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
 947 {
 948 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
 949         if (ap_req->ticket->enc_part.kvno)
 950                 return ap_req->ticket->enc_part.kvno;
 951 #else /* Heimdal */
 952         if (ap_req->ticket.enc_part.kvno)
 953                 return *ap_req->ticket.enc_part.kvno;
 954 #endif
 955         return 0;
 956 }
 957
 958 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
 959 {
 960 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
 961         return ap_req->ticket.enc_part.etype;
 962 #else /* MIT */
 963         return ap_req->ticket->enc_part.enctype;
 964 #endif
 965 }
 966 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
 967
 968 static krb5_error_code
 969 get_key_from_keytab(krb5_context context,
 970                     krb5_const_principal server,
 971                     krb5_enctype enctype,
 972                     krb5_kvno kvno,
 973                     krb5_keyblock **out_key)
 974 {
 975         krb5_keytab_entry entry;
 976         krb5_error_code ret;
 977         krb5_keytab keytab;
 978         char *name = NULL;
 979         krb5_keyblock *keyp;
 980
 981         /* We have to open a new keytab handle here, as MIT does
 982            an implicit open/getnext/close on krb5_kt_get_entry. We
 983            may be in the middle of a keytab enumeration when this is
 984            called. JRA. */
 985
 986         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
 987         if (ret) {
 988                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 989                 return ret;
 990         }
 991
 992         if ( DEBUGLEVEL >= 10 ) {
 993                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
 994                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
 995                                 kvno, enctype, name));
 996                         TALLOC_FREE(name);
 997                 }
 998         }
 999
1000         ret = krb5_kt_get_entry(context,
1001                                 keytab,
1002                                 server,
1003                                 kvno,
1004                                 enctype,
1005                                 &entry);
1006
1007         if (ret) {
1008                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1009                 goto out;
1010         }
1011
1012         keyp = KRB5_KT_KEY(&entry);
1013
1014         ret = krb5_copy_keyblock(context, keyp, out_key);
1015         if (ret) {
1016                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1017                 goto out;
1018         }
1019
1020         smb_krb5_kt_free_entry(context, &entry);
1021
1022 out:
1023         krb5_kt_close(context, keytab);
1024         return ret;
1025 }
1026
1027 /* Prototypes */
1028
1029  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1030                                                  const krb5_data *inbuf,
1031                                                  krb5_kvno *kvno,
1032                                                  krb5_enctype *enctype)
1033 {
1034 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1035         {
1036                 krb5_error_code ret;
1037                 krb5_ap_req ap_req;
1038
1039                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1040                 if (ret)
1041                         return ret;
1042
1043                 *kvno = get_kvno_from_ap_req(&ap_req);
1044                 *enctype = get_enctype_from_ap_req(&ap_req);
1045
1046                 free_AP_REQ(&ap_req);
1047                 return 0;
1048         }
1049 #endif
1050
1051         /* Possibly not an appropriate error code. */
1052         return KRB5KDC_ERR_BADOPTION;
1053 }
1054
1055  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1056                                                         krb5_auth_context *auth_context,
1057                                                         const krb5_data *inbuf,
1058                                                         krb5_const_principal server,
1059                                                         krb5_keytab keytab,
1060                                                         krb5_flags *ap_req_options,
1061                                                         krb5_ticket **ticket,
1062                                                         krb5_keyblock **keyblock)
1063 {
1064         krb5_error_code ret;
1065         krb5_kvno kvno;
1066         krb5_enctype enctype;
1067         krb5_keyblock *local_keyblock;
1068
1069         ret = krb5_rd_req(context,
1070                           auth_context,
1071                           inbuf,
1072                           server,
1073                           keytab,
1074                           ap_req_options,
1075                           ticket);
1076         if (ret) {
1077                 return ret;
1078         }
1079
1080 #ifdef KRB5_TICKET_HAS_KEYINFO
1081         enctype = (*ticket)->enc_part.enctype;
1082         kvno = (*ticket)->enc_part.kvno;
1083 #else
1084         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1085         if (ret) {
1086                 return ret;
1087         }
1088 #endif
1089
1090         ret = get_key_from_keytab(context,
1091                                   server,
1092                                   enctype,
1093                                   kvno,
1094                                   &local_keyblock);
1095         if (ret) {
1096                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1097                 goto out;
1098         }
1099
1100 out:
1101         if (ret && local_keyblock != NULL) {
1102                 krb5_free_keyblock(context, local_keyblock);
1103         } else {
1104                 *keyblock = local_keyblock;
1105         }
1106
1107         return ret;
1108 }
1109
1110  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1111                                        const char *client_string,       /* gd@BER.SUSE.DE */
1112                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1113                                        time_t *expire_time)
1114 {
1115         krb5_error_code ret;
1116         krb5_context context = NULL;
1117         krb5_ccache ccache = NULL;
1118         krb5_principal client = NULL;
1119         krb5_creds creds, creds_in, *creds_out = NULL;
1120
1121         ZERO_STRUCT(creds);
1122         ZERO_STRUCT(creds_in);
1123
1124         initialize_krb5_error_table();
1125         ret = krb5_init_context(&context);
1126         if (ret) {
1127                 goto done;
1128         }
1129
1130         if (!ccache_string) {
1131                 ccache_string = krb5_cc_default_name(context);
1132         }
1133
1134         if (!ccache_string) {
1135                 ret = EINVAL;
1136                 goto done;
1137         }
1138
1139         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1140
1141         /* FIXME: we should not fall back to defaults */
1142         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
1143         if (ret) {
1144                 goto done;
1145         }
1146
1147         if (client_string) {
1148                 ret = smb_krb5_parse_name(context, client_string, &client);
1149                 if (ret) {
1150                         goto done;
1151                 }
1152         } else {
1153                 ret = krb5_cc_get_principal(context, ccache, &client);
1154                 if (ret) {
1155                         goto done;
1156                 }
1157         }
1158
1159 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1160         {
1161                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
1162                 if (ret) {
1163                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1164                         goto done;
1165                 }
1166         }
1167 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1168         {
1169                 krb5_kdc_flags flags;
1170                 krb5_realm *client_realm = NULL;
1171
1172                 ret = krb5_copy_principal(context, client, &creds_in.client);
1173                 if (ret) {
1174                         goto done;
1175                 }
1176
1177                 if (service_string) {
1178                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1179                         if (ret) {
1180                                 goto done;
1181                         }
1182                 } else {
1183                         /* build tgt service by default */
1184                         client_realm = krb5_princ_realm(context, creds_in.client);
1185                         if (!client_realm) {
1186                                 ret = ENOMEM;
1187                                 goto done;
1188                         }
1189                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1190                         if (ret) {
1191                                 goto done;
1192                         }
1193                 }
1194
1195                 flags.i = 0;
1196                 flags.b.renewable = flags.b.renew = True;
1197
1198                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1199                 if (ret) {
1200                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1201                         goto done;
1202                 }
1203
1204                 creds = *creds_out;
1205         }
1206 #else
1207 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1208 #endif
1209
1210         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1211         ret = krb5_cc_initialize(context, ccache, client);
1212         if (ret) {
1213                 goto done;
1214         }
1215
1216         ret = krb5_cc_store_cred(context, ccache, &creds);
1217
1218         if (expire_time) {
1219                 *expire_time = (time_t) creds.times.endtime;
1220         }
1221
1222 done:
1223         krb5_free_cred_contents(context, &creds_in);
1224
1225         if (creds_out) {
1226                 krb5_free_creds(context, creds_out);
1227         } else {
1228                 krb5_free_cred_contents(context, &creds);
1229         }
1230
1231         if (client) {
1232                 krb5_free_principal(context, client);
1233         }
1234         if (ccache) {
1235                 krb5_cc_close(context, ccache);
1236         }
1237         if (context) {
1238                 krb5_free_context(context);
1239         }
1240
1241         return ret;
1242 }
1243
1244  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1245 {
1246         krb5_error_code ret = 0;
1247         if (addr == NULL) {
1248                 return ret;
1249         }
1250 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1251         krb5_free_addresses(context, addr->addrs);
1252 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1253         ret = krb5_free_addresses(context, addr->addrs);
1254         SAFE_FREE(addr->addrs);
1255 #endif
1256         SAFE_FREE(addr);
1257         addr = NULL;
1258         return ret;
1259 }
1260
1261  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1262 {
1263         krb5_error_code ret = 0;
1264         nstring buf;
1265 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1266         krb5_address **addrs = NULL;
1267 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1268         krb5_addresses *addrs = NULL;
1269 #endif
1270
1271         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1272         if (*kerb_addr == NULL) {
1273                 return ENOMEM;
1274         }
1275
1276         put_name(buf, lp_netbios_name(), ' ', 0x20);
1277
1278 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1279         {
1280                 int num_addr = 2;
1281
1282                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1283                 if (addrs == NULL) {
1284                         SAFE_FREE(*kerb_addr);
1285                         return ENOMEM;
1286                 }
1287
1288                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1289
1290                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1291                 if (addrs[0] == NULL) {
1292                         SAFE_FREE(addrs);
1293                         SAFE_FREE(*kerb_addr);
1294                         return ENOMEM;
1295                 }
1296
1297                 addrs[0]->magic = KV5M_ADDRESS;
1298                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1299                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1300                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1301                 if (addrs[0]->contents == NULL) {
1302                         SAFE_FREE(addrs[0]);
1303                         SAFE_FREE(addrs);
1304                         SAFE_FREE(*kerb_addr);
1305                         return ENOMEM;
1306                 }
1307
1308                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1309
1310                 addrs[1] = NULL;
1311         }
1312 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1313         {
1314                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1315                 if (addrs == NULL) {
1316                         SAFE_FREE(*kerb_addr);
1317                         return ENOMEM;
1318                 }
1319
1320                 memset(addrs, 0, sizeof(krb5_addresses));
1321
1322                 addrs->len = 1;
1323                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1324                 if (addrs->val == NULL) {
1325                         SAFE_FREE(addrs);
1326                         SAFE_FREE(kerb_addr);
1327                         return ENOMEM;
1328                 }
1329
1330                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1331                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1332                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1333                 if (addrs->val[0].address.data == NULL) {
1334                         SAFE_FREE(addrs->val);
1335                         SAFE_FREE(addrs);
1336                         SAFE_FREE(*kerb_addr);
1337                         return ENOMEM;
1338                 }
1339
1340                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1341         }
1342 #else
1343 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1344 #endif
1345         (*kerb_addr)->addrs = addrs;
1346
1347         return ret;
1348 }
1349
1350  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1351 {
1352 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1353         krb5_free_error_contents(context, krberror);
1354 #else /* MIT */
1355         krb5_free_error(context, krberror);
1356 #endif
1357 }
1358
1359  krb5_error_code handle_krberror_packet(krb5_context context,
1360                                         krb5_data *packet)
1361 {
1362         krb5_error_code ret;
1363         bool got_error_code = False;
1364
1365         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1366
1367 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1368         {
1369                 krb5_error krberror;
1370
1371                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1372                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1373                                 error_message(ret)));
1374                         return ret;
1375                 }
1376
1377                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1378                         ret = (krb5_error_code) krberror.error_code;
1379                         got_error_code = True;
1380                 }
1381
1382                 smb_krb5_free_error(context, &krberror);
1383         }
1384 #else /* MIT */
1385         {
1386                 krb5_error *krberror;
1387
1388                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1389                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1390                                 error_message(ret)));
1391                         return ret;
1392                 }
1393
1394                 if (krberror->e_data.data == NULL) {
1395 #if defined(ERROR_TABLE_BASE_krb5)
1396                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1397 #else
1398                         ret = (krb5_error_code)krberror->error;
1399 #endif
1400                         got_error_code = True;
1401                 }
1402                 smb_krb5_free_error(context, krberror);
1403         }
1404 #endif
1405         if (got_error_code) {
1406                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1407                         error_message(ret), ret));
1408         }
1409         return ret;
1410 }
1411
1412  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1413                                             krb5_get_init_creds_opt **opt)
1414 {
1415 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1416         /* Heimdal or modern MIT version */
1417         return krb5_get_init_creds_opt_alloc(context, opt);
1418 #else
1419         /* Historical MIT version */
1420         krb5_get_init_creds_opt *my_opt;
1421
1422         *opt = NULL;
1423
1424         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1425                 return ENOMEM;
1426         }
1427
1428         krb5_get_init_creds_opt_init(my_opt);
1429
1430         *opt =  my_opt;
1431         return 0;
1432 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1433 }
1434
1435  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1436                                 krb5_get_init_creds_opt *opt)
1437 {
1438 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1439
1440 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1441         /* Modern MIT or Heimdal version */
1442         krb5_get_init_creds_opt_free(context, opt);
1443 #else
1444         /* Heimdal version */
1445         krb5_get_init_creds_opt_free(opt);
1446 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1447
1448 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1449         /* Historical MIT version */
1450         SAFE_FREE(opt);
1451         opt = NULL;
1452 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1453 }
1454
1455  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1456 {
1457         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1458 }
1459
1460
1461 /* caller needs to free etype_s */
1462  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1463                                             krb5_enctype enctype,
1464                                             char **etype_s)
1465 {
1466 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1467         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1468 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1469         char buf[256];
1470         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1471         if (ret) {
1472                 return ret;
1473         }
1474         *etype_s = SMB_STRDUP(buf);
1475         if (!*etype_s) {
1476                 return ENOMEM;
1477         }
1478         return ret;
1479 #else
1480 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1481 #endif
1482 }
1483
1484  krb5_error_code smb_krb5_mk_error(krb5_context context,
1485                                 krb5_error_code error_code,
1486                                 const krb5_principal server,
1487                                 krb5_data *reply)
1488 {
1489 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1490         /*
1491          * The MIT interface is *terrible*.
1492          * We have to construct this ourselves...
1493          */
1494         krb5_error e;
1495
1496         memset(&e, 0, sizeof(e));
1497         krb5_us_timeofday(context, &e.stime, &e.susec);
1498         e.server = server;
1499 #if defined(krb5_err_base)
1500         e.error = error_code - krb5_err_base;
1501 #elif defined(ERROR_TABLE_BASE_krb5)
1502         e.error = error_code - ERROR_TABLE_BASE_krb5;
1503 #else
1504         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1505 #endif
1506
1507         return krb5_mk_error(context, &e, reply);
1508 #else /* Heimdal. */
1509         return krb5_mk_error(context,
1510                                 error_code,
1511                                 NULL,
1512                                 NULL, /* e_data */
1513                                 NULL,
1514                                 server,
1515                                 NULL,
1516                                 NULL,
1517                                 reply);
1518 #endif
1519 }
1520
1521 /**********************************************************************
1522  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1523  * allows to process non-default keytab names.
1524  * @param context krb5_context
1525  * @param keytab_name_req string
1526  * @param write_access bool if writable keytab is required
1527  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1528  * @return krb5_error_code
1529 **********************************************************************/
1530
1531 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1532 #ifndef MAX_KEYTAB_NAME_LEN
1533 #define MAX_KEYTAB_NAME_LEN 1100
1534 #endif
1535
1536  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1537                                       const char *keytab_name_req,
1538                                       bool write_access,
1539                                       krb5_keytab *keytab)
1540 {
1541         krb5_error_code ret = 0;
1542         TALLOC_CTX *mem_ctx;
1543         char keytab_string[MAX_KEYTAB_NAME_LEN];
1544         char *kt_str = NULL;
1545         bool found_valid_name = False;
1546         const char *pragma = "FILE";
1547         const char *tmp = NULL;
1548
1549         if (!write_access && !keytab_name_req) {
1550                 /* caller just wants to read the default keytab readonly, so be it */
1551                 return krb5_kt_default(context, keytab);
1552         }
1553
1554         mem_ctx = talloc_init("smb_krb5_open_keytab");
1555         if (!mem_ctx) {
1556                 return ENOMEM;
1557         }
1558
1559 #ifdef HAVE_WRFILE_KEYTAB
1560         if (write_access) {
1561                 pragma = "WRFILE";
1562         }
1563 #endif
1564
1565         if (keytab_name_req) {
1566
1567                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1568                         ret = KRB5_CONFIG_NOTENUFSPACE;
1569                         goto out;
1570                 }
1571
1572                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1573                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1574                         tmp = keytab_name_req;
1575                         goto resolve;
1576                 }
1577
1578                 if (keytab_name_req[0] != '/') {
1579                         ret = KRB5_KT_BADNAME;
1580                         goto out;
1581                 }
1582
1583                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1584                 if (!tmp) {
1585                         ret = ENOMEM;
1586                         goto out;
1587                 }
1588
1589                 goto resolve;
1590         }
1591
1592         /* we need to handle more complex keytab_strings, like:
1593          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1594
1595         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1596         if (ret) {
1597                 goto out;
1598         }
1599
1600         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1601
1602         tmp = talloc_strdup(mem_ctx, keytab_string);
1603         if (!tmp) {
1604                 ret = ENOMEM;
1605                 goto out;
1606         }
1607
1608         if (strncmp(tmp, "ANY:", 4) == 0) {
1609                 tmp += 4;
1610         }
1611
1612         memset(&keytab_string, '\0', sizeof(keytab_string));
1613
1614         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1615                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1616                         found_valid_name = True;
1617                         tmp = kt_str;
1618                         tmp += 7;
1619                 }
1620
1621                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1622                         found_valid_name = True;
1623                         tmp = kt_str;
1624                         tmp += 5;
1625                 }
1626
1627                 if (tmp[0] == '/') {
1628                         /* Treat as a FILE: keytab definition. */
1629                         found_valid_name = true;
1630                 }
1631
1632                 if (found_valid_name) {
1633                         if (tmp[0] != '/') {
1634                                 ret = KRB5_KT_BADNAME;
1635                                 goto out;
1636                         }
1637
1638                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1639                         if (!tmp) {
1640                                 ret = ENOMEM;
1641                                 goto out;
1642                         }
1643                         break;
1644                 }
1645         }
1646
1647         if (!found_valid_name) {
1648                 ret = KRB5_KT_UNKNOWN_TYPE;
1649                 goto out;
1650         }
1651
1652  resolve:
1653         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1654         ret = krb5_kt_resolve(context, tmp, keytab);
1655
1656  out:
1657         TALLOC_FREE(mem_ctx);
1658         return ret;
1659 }
1660
1661 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1662                                      krb5_context context,
1663                                      krb5_keytab keytab,
1664                                      const char **keytab_name)
1665 {
1666         char keytab_string[MAX_KEYTAB_NAME_LEN];
1667         krb5_error_code ret = 0;
1668
1669         ret = krb5_kt_get_name(context, keytab,
1670                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1671         if (ret) {
1672                 return ret;
1673         }
1674
1675         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1676         if (!*keytab_name) {
1677                 return ENOMEM;
1678         }
1679
1680         return ret;
1681 }
1682
1683 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1684     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1685     defined(HAVE_KRB5_GET_CREDS)
1686 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1687                                                              krb5_ccache ccache,
1688                                                              krb5_principal me,
1689                                                              krb5_principal server,
1690                                                              krb5_principal impersonate_princ,
1691                                                              krb5_creds **out_creds)
1692 {
1693         krb5_error_code ret;
1694         krb5_get_creds_opt opt;
1695
1696         ret = krb5_get_creds_opt_alloc(context, &opt);
1697         if (ret) {
1698                 goto done;
1699         }
1700         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1701
1702         if (impersonate_princ) {
1703                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1704                                                          impersonate_princ);
1705                 if (ret) {
1706                         goto done;
1707                 }
1708         }
1709
1710         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1711         if (ret) {
1712                 goto done;
1713         }
1714
1715  done:
1716         if (opt) {
1717                 krb5_get_creds_opt_free(context, opt);
1718         }
1719         return ret;
1720 }
1721 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1722
1723 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1724 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1725                                                          krb5_ccache ccache,
1726                                                          krb5_principal me,
1727                                                          krb5_principal server,
1728                                                          krb5_principal impersonate_princ,
1729                                                          krb5_creds **out_creds)
1730 {
1731         krb5_error_code ret;
1732         krb5_creds in_creds;
1733
1734 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1735 krb5_error_code KRB5_CALLCONV
1736 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1737                               krb5_ccache ccache, krb5_creds *in_creds,
1738                               krb5_data *subject_cert,
1739                               krb5_creds **out_creds);
1740 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1741
1742         ZERO_STRUCT(in_creds);
1743
1744         if (impersonate_princ) {
1745
1746                 in_creds.server = me;
1747                 in_creds.client = impersonate_princ;
1748
1749                 ret = krb5_get_credentials_for_user(context,
1750                                                     0, /* krb5_flags options */
1751                                                     ccache,
1752                                                     &in_creds,
1753                                                     NULL, /* krb5_data *subject_cert */
1754                                                     out_creds);
1755         } else {
1756                 in_creds.client = me;
1757                 in_creds.server = server;
1758
1759                 ret = krb5_get_credentials(context, 0, ccache,
1760                                            &in_creds, out_creds);
1761         }
1762
1763         return ret;
1764 }
1765 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1766
1767 /*
1768  * smb_krb5_get_credentials
1769  *
1770  * @brief Get krb5 credentials for a server
1771  *
1772  * @param[in] context           An initialized krb5_context
1773  * @param[in] ccache            An initialized krb5_ccache
1774  * @param[in] me                The krb5_principal of the caller
1775  * @param[in] server            The krb5_principal of the requested service
1776  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1777  * @param[out] out_creds        The returned krb5_creds structure
1778  * @return krb5_error_code
1779  *
1780  */
1781 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1782                                          krb5_ccache ccache,
1783                                          krb5_principal me,
1784                                          krb5_principal server,
1785                                          krb5_principal impersonate_princ,
1786                                          krb5_creds **out_creds)
1787 {
1788         krb5_error_code ret;
1789         krb5_creds *creds = NULL;
1790
1791         *out_creds = NULL;
1792
1793         if (impersonate_princ) {
1794 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1795                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1796 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1797                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1798 #else
1799                 ret = ENOTSUP;
1800 #endif
1801         } else {
1802                 krb5_creds in_creds;
1803
1804                 ZERO_STRUCT(in_creds);
1805
1806                 in_creds.client = me;
1807                 in_creds.server = server;
1808
1809                 ret = krb5_get_credentials(context, 0, ccache,
1810                                            &in_creds, &creds);
1811         }
1812         if (ret) {
1813                 goto done;
1814         }
1815
1816         if (out_creds) {
1817                 *out_creds = creds;
1818         }
1819
1820  done:
1821         if (creds && ret) {
1822                 krb5_free_creds(context, creds);
1823         }
1824
1825         return ret;
1826 }
1827
1828 /*
1829  * smb_krb5_get_creds
1830  *
1831  * @brief Get krb5 credentials for a server
1832  *
1833  * @param[in] server_s          The string name of the service
1834  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
1835  * @param[in] cc                The krb5 credential cache string name (optional)
1836  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
1837  * @param[out] creds_p          The returned krb5_creds structure
1838  * @return krb5_error_code
1839  *
1840  */
1841 krb5_error_code smb_krb5_get_creds(const char *server_s,
1842                                    time_t time_offset,
1843                                    const char *cc,
1844                                    const char *impersonate_princ_s,
1845                                    krb5_creds **creds_p)
1846 {
1847         krb5_error_code ret;
1848         krb5_context context = NULL;
1849         krb5_principal me = NULL;
1850         krb5_principal server = NULL;
1851         krb5_principal impersonate_princ = NULL;
1852         krb5_creds *creds = NULL;
1853         krb5_ccache ccache = NULL;
1854
1855         *creds_p = NULL;
1856
1857         initialize_krb5_error_table();
1858         ret = krb5_init_context(&context);
1859         if (ret) {
1860                 goto done;
1861         }
1862
1863         if (time_offset != 0) {
1864                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
1865         }
1866
1867         ret = krb5_cc_resolve(context, cc ? cc :
1868                 krb5_cc_default_name(context), &ccache);
1869         if (ret) {
1870                 goto done;
1871         }
1872
1873         ret = krb5_cc_get_principal(context, ccache, &me);
1874         if (ret) {
1875                 goto done;
1876         }
1877
1878         ret = smb_krb5_parse_name(context, server_s, &server);
1879         if (ret) {
1880                 goto done;
1881         }
1882
1883         if (impersonate_princ_s) {
1884                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
1885                                           &impersonate_princ);
1886                 if (ret) {
1887                         goto done;
1888                 }
1889         }
1890
1891         ret = smb_krb5_get_credentials(context, ccache,
1892                                        me, server, impersonate_princ,
1893                                        &creds);
1894         if (ret) {
1895                 goto done;
1896         }
1897
1898         ret = krb5_cc_store_cred(context, ccache, creds);
1899         if (ret) {
1900                 goto done;
1901         }
1902
1903         if (creds_p) {
1904                 *creds_p = creds;
1905         }
1906
1907         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
1908                 server_s));
1909
1910         if (impersonate_princ_s) {
1911                 char *client = NULL;
1912
1913                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
1914                 if (ret) {
1915                         goto done;
1916                 }
1917                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
1918                         client));
1919                 TALLOC_FREE(client);
1920         }
1921
1922  done:
1923         if (!context) {
1924                 return ret;
1925         }
1926
1927         if (creds && ret) {
1928                 krb5_free_creds(context, creds);
1929         }
1930         if (server) {
1931                 krb5_free_principal(context, server);
1932         }
1933         if (me) {
1934                 krb5_free_principal(context, me);
1935         }
1936         if (impersonate_princ) {
1937                 krb5_free_principal(context, impersonate_princ);
1938         }
1939         if (ccache) {
1940                 krb5_cc_close(context, ccache);
1941         }
1942         krb5_free_context(context);
1943
1944         return ret;
1945 }
1946
1947 /*
1948  * smb_krb5_principal_get_realm
1949  *
1950  * @brief Get realm of a principal
1951  *
1952  * @param[in] context           The krb5_context
1953  * @param[in] principal         The principal
1954  * @return pointer to the realm
1955  *
1956  */
1957
1958 char *smb_krb5_principal_get_realm(krb5_context context,
1959                                    krb5_principal principal)
1960 {
1961 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
1962         return discard_const_p(char, krb5_principal_get_realm(context, principal));
1963 #elif defined(krb5_princ_realm) /* MIT */
1964         krb5_data *realm;
1965         realm = krb5_princ_realm(context, principal);
1966         return discard_const_p(char, realm->data);
1967 #else
1968         return NULL;
1969 #endif
1970 }
1971
1972 #else /* HAVE_KRB5 */
1973  /* this saves a few linking headaches */
1974  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
1975                         const char *principal, time_t time_offset,
1976                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
1977                         uint32_t extra_ap_opts,
1978                         const char *ccname, time_t *tgs_expire,
1979                         const char *impersonate_princ_s)
1980 {
1981          DEBUG(0,("NO KERBEROS SUPPORT\n"));
1982          return 1;
1983 }
1984
1985 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
1986 {
1987         DEBUG(0,("NO KERBEROS SUPPORT\n"));
1988         return false;
1989 }
1990
1991 #endif /* HAVE_KRB5 */