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 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 475         krb5_boolean similar = 0;
 476
 477         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 478         return similar ? True : False;
 479 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 480         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 481 #endif
 482 }
 483
 484 static bool ads_cleanup_expired_creds(krb5_context context,
 485                                       krb5_ccache  ccache,
 486                                       krb5_creds  *credsp)
 487 {
 488         krb5_error_code retval;
 489         const char *cc_type = krb5_cc_get_type(context, ccache);
 490
 491         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 492                   cc_type, krb5_cc_get_name(context, ccache),
 493                   http_timestring(talloc_tos(), credsp->times.endtime)));
 494
 495         /* we will probably need new tickets if the current ones
 496            will expire within 10 seconds.
 497         */
 498         if (credsp->times.endtime >= (time(NULL) + 10))
 499                 return False;
 500
 501         /* heimdal won't remove creds from a file ccache, and
 502            perhaps we shouldn't anyway, since internally we
 503            use memory ccaches, and a FILE one probably means that
 504            we're using creds obtained outside of our exectuable
 505         */
 506         if (strequal(cc_type, "FILE")) {
 507                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 508                 return False;
 509         }
 510
 511         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 512         if (retval) {
 513                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 514                           error_message(retval)));
 515                 /* If we have an error in this, we want to display it,
 516                    but continue as though we deleted it */
 517         }
 518         return True;
 519 }
 520
 521 /* Allocate and setup the auth context into the state we need. */
 522
 523 static krb5_error_code setup_auth_context(krb5_context context,
 524                         krb5_auth_context *auth_context)
 525 {
 526         krb5_error_code retval;
 527
 528         retval = krb5_auth_con_init(context, auth_context );
 529         if (retval) {
 530                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 531                         error_message(retval)));
 532                 return retval;
 533         }
 534
 535         /* Ensure this is an addressless ticket. */
 536         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 537         if (retval) {
 538                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 539                         error_message(retval)));
 540         }
 541
 542         return retval;
 543 }
 544
 545 #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)
 546 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 547                                                 uint32_t gss_flags)
 548 {
 549         unsigned int orig_length = in_data->length;
 550         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 551         char *gss_cksum = NULL;
 552
 553         if (orig_length) {
 554                 /* Extra length field for delgated ticket. */
 555                 base_cksum_size += 4;
 556         }
 557
 558         if ((unsigned int)base_cksum_size + orig_length <
 559                         (unsigned int)base_cksum_size) {
 560                 return EINVAL;
 561         }
 562
 563         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 564         if (gss_cksum == NULL) {
 565                 return ENOMEM;
 566         }
 567
 568         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 569         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 570
 571         /*
 572          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 573          * This matches the behavior of heimdal and mit.
 574          *
 575          * And it is needed to work against some closed source
 576          * SMB servers.
 577          *
 578          * See bug #7883
 579          */
 580         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 581
 582         SIVAL(gss_cksum, 20, gss_flags);
 583
 584         if (orig_length) {
 585                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 586                 SSVAL(gss_cksum, 26, orig_length);
 587                 /* Copy the kerberos KRB_CRED data */
 588                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 589                 free(in_data->data);
 590                 in_data->data = NULL;
 591                 in_data->length = 0;
 592         }
 593         in_data->data = gss_cksum;
 594         in_data->length = base_cksum_size + orig_length;
 595         return 0;
 596 }
 597 #endif
 598
 599 /*
 600   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 601 */
 602 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 603                                        krb5_auth_context *auth_context,
 604                                        const krb5_flags ap_req_options,
 605                                        const char *principal,
 606                                        krb5_ccache ccache,
 607                                        krb5_data *outbuf,
 608                                        time_t *expire_time,
 609                                        const char *impersonate_princ_s)
 610 {
 611         krb5_error_code           retval;
 612         krb5_principal    server;
 613         krb5_principal impersonate_princ = NULL;
 614         krb5_creds              * credsp;
 615         krb5_creds                creds;
 616         krb5_data in_data;
 617         bool creds_ready = False;
 618         int i = 0, maxtries = 3;
 619
 620         ZERO_STRUCT(in_data);
 621
 622         retval = smb_krb5_parse_name(context, principal, &server);
 623         if (retval) {
 624                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 625                 return retval;
 626         }
 627
 628         if (impersonate_princ_s) {
 629                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 630                                              &impersonate_princ);
 631                 if (retval) {
 632                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 633                         goto cleanup_princ;
 634                 }
 635         }
 636
 637         /* obtain ticket & session key */
 638         ZERO_STRUCT(creds);
 639         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 640                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 641                          error_message(retval)));
 642                 goto cleanup_princ;
 643         }
 644
 645         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 646                 /* This can commonly fail on smbd startup with no ticket in the cache.
 647                  * Report at higher level than 1. */
 648                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 649                          error_message(retval)));
 650                 goto cleanup_creds;
 651         }
 652
 653         while (!creds_ready && (i < maxtries)) {
 654
 655                 if ((retval = smb_krb5_get_credentials(context, ccache,
 656                                                        creds.client,
 657                                                        creds.server,
 658                                                        impersonate_princ,
 659                                                        &credsp))) {
 660                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 661                                 principal, error_message(retval)));
 662                         goto cleanup_creds;
 663                 }
 664
 665                 /* cope with ticket being in the future due to clock skew */
 666                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 667                         time_t t = time(NULL);
 668                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 669                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 670                         krb5_set_real_time(context, t + time_offset + 1, 0);
 671                 }
 672
 673                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 674                         creds_ready = True;
 675                 }
 676
 677                 i++;
 678         }
 679
 680         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 681                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 682                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 683                   (unsigned)credsp->times.endtime));
 684
 685         if (expire_time) {
 686                 *expire_time = (time_t)credsp->times.endtime;
 687         }
 688
 689         /* Allocate the auth_context. */
 690         retval = setup_auth_context(context, auth_context);
 691         if (retval) {
 692                 DEBUG(1,("setup_auth_context failed (%s)\n",
 693                         error_message(retval)));
 694                 goto cleanup_creds;
 695         }
 696
 697 #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)
 698         {
 699                 uint32_t gss_flags = 0;
 700
 701                 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 702                         /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 703                          as part of the kerberos exchange. */
 704
 705                         DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 706
 707                         retval = krb5_auth_con_setuseruserkey(context,
 708                                         *auth_context,
 709                                         &credsp->keyblock );
 710                         if (retval) {
 711                                 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 712                                         error_message(retval)));
 713                                 goto cleanup_creds;
 714                         }
 715
 716                         /* Must use a subkey for forwarded tickets. */
 717                         retval = krb5_auth_con_setflags(context,
 718                                 *auth_context,
 719                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 720                         if (retval) {
 721                                 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 722                                         error_message(retval)));
 723                                 goto cleanup_creds;
 724                         }
 725
 726                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 727                                 *auth_context,  /* Authentication context [in] */
 728                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 729                                 credsp->client, /* Client principal for the tgt [in] */
 730                                 credsp->server, /* Server principal for the tgt [in] */
 731                                 ccache,         /* Credential cache to use for storage [in] */
 732                                 1,              /* Turn on for "Forwardable ticket" [in] */
 733                                 &in_data );     /* Resulting response [out] */
 734
 735                         if (retval) {
 736                                 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 737                                            error_message( retval ) ) );
 738
 739                                 /*
 740                                  * This is not fatal. Delete the *auth_context and continue
 741                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
 742                                  */
 743
 744                                 if (in_data.data) {
 745                                         free( in_data.data );
 746                                         in_data.data = NULL;
 747                                         in_data.length = 0;
 748                                 }
 749                                 krb5_auth_con_free(context, *auth_context);
 750                                 *auth_context = NULL;
 751                                 retval = setup_auth_context(context, auth_context);
 752                                 if (retval) {
 753                                         DEBUG(1,("setup_auth_context failed (%s)\n",
 754                                                 error_message(retval)));
 755                                         goto cleanup_creds;
 756                                 }
 757                         } else {
 758                                 /* We got a delegated ticket. */
 759                                 gss_flags |= GSS_C_DELEG_FLAG;
 760                         }
 761                 }
 762
 763                 /* Frees and reallocates in_data into a GSS checksum blob. */
 764                 retval = create_gss_checksum(&in_data, gss_flags);
 765                 if (retval) {
 766                         goto cleanup_data;
 767                 }
 768
 769                 /* We always want GSS-checksum types. */
 770                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 771                 if (retval) {
 772                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 773                                 error_message(retval)));
 774                         goto cleanup_data;
 775                 }
 776         }
 777 #endif
 778
 779         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 780                                       &in_data, credsp, outbuf);
 781         if (retval) {
 782                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 783                          error_message(retval)));
 784         }
 785
 786 #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)
 787 cleanup_data:
 788 #endif
 789
 790         if (in_data.data) {
 791                 free( in_data.data );
 792                 in_data.length = 0;
 793         }
 794
 795         krb5_free_creds(context, credsp);
 796
 797 cleanup_creds:
 798         krb5_free_cred_contents(context, &creds);
 799
 800 cleanup_princ:
 801         krb5_free_principal(context, server);
 802         if (impersonate_princ) {
 803                 krb5_free_principal(context, impersonate_princ);
 804         }
 805
 806         return retval;
 807 }
 808
 809 /*
 810   get a kerberos5 ticket for the given service
 811 */
 812 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 813                         const char *principal, time_t time_offset,
 814                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 815                         uint32_t extra_ap_opts, const char *ccname,
 816                         time_t *tgs_expire,
 817                         const char *impersonate_princ_s)
 818
 819 {
 820         krb5_error_code retval;
 821         krb5_data packet;
 822         krb5_context context = NULL;
 823         krb5_ccache ccdef = NULL;
 824         krb5_auth_context auth_context = NULL;
 825         krb5_enctype enc_types[] = {
 826                 ENCTYPE_ARCFOUR_HMAC,
 827                 ENCTYPE_DES_CBC_MD5,
 828                 ENCTYPE_DES_CBC_CRC,
 829                 ENCTYPE_NULL};
 830
 831         initialize_krb5_error_table();
 832         retval = krb5_init_context(&context);
 833         if (retval) {
 834                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 835                          error_message(retval)));
 836                 goto failed;
 837         }
 838
 839         if (time_offset != 0) {
 840                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 841         }
 842
 843         if ((retval = krb5_cc_resolve(context, ccname ?
 844                         ccname : krb5_cc_default_name(context), &ccdef))) {
 845                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 846                          error_message(retval)));
 847                 goto failed;
 848         }
 849
 850         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 851                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 852                          error_message(retval)));
 853                 goto failed;
 854         }
 855
 856         retval = ads_krb5_mk_req(context, &auth_context,
 857                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 858                                 principal, ccdef, &packet,
 859                                 tgs_expire, impersonate_princ_s);
 860         if (retval) {
 861                 goto failed;
 862         }
 863
 864         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 865                                  session_key_krb5, false);
 866
 867         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 868
 869         kerberos_free_data_contents(context, &packet);
 870
 871 failed:
 872
 873         if (context) {
 874                 if (ccdef)
 875                         krb5_cc_close(context, ccdef);
 876                 if (auth_context)
 877                         krb5_auth_con_free(context, auth_context);
 878                 krb5_free_context(context);
 879         }
 880
 881         return retval;
 882 }
 883
 884 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 885                               krb5_context context,
 886                               krb5_auth_context auth_context,
 887                               DATA_BLOB *session_key, bool remote)
 888 {
 889         krb5_keyblock *skey = NULL;
 890         krb5_error_code err = 0;
 891         bool ret = false;
 892
 893         if (remote) {
 894                 err = krb5_auth_con_getremotesubkey(context,
 895                                                     auth_context, &skey);
 896         } else {
 897                 err = krb5_auth_con_getlocalsubkey(context,
 898                                                    auth_context, &skey);
 899         }
 900
 901         if (err || skey == NULL) {
 902                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 903                 goto done;
 904         }
 905
 906         DEBUG(10, ("Got KRB5 session key of length %d\n",
 907                    (int)KRB5_KEY_LENGTH(skey)));
 908
 909         *session_key = data_blob_talloc(mem_ctx,
 910                                          KRB5_KEY_DATA(skey),
 911                                          KRB5_KEY_LENGTH(skey));
 912         dump_data_pw("KRB5 Session Key:\n",
 913                      session_key->data,
 914                      session_key->length);
 915
 916         ret = true;
 917
 918 done:
 919         if (skey) {
 920                 krb5_free_keyblock(context, skey);
 921         }
 922
 923         return ret;
 924 }
 925
 926
 927 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 928  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 929
 930  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 931 {
 932         static krb5_data kdata;
 933
 934         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 935         kdata.length = strlen((const char *)kdata.data);
 936         return &kdata;
 937 }
 938 #endif
 939
 940  time_t get_authtime_from_tkt(krb5_ticket *tkt)
 941 {
 942 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 943         return tkt->enc_part2->times.authtime;
 944 #else
 945         return tkt->ticket.authtime;
 946 #endif
 947 }
 948
 949 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
 950 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
 951 {
 952 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
 953         if (ap_req->ticket->enc_part.kvno)
 954                 return ap_req->ticket->enc_part.kvno;
 955 #else /* Heimdal */
 956         if (ap_req->ticket.enc_part.kvno)
 957                 return *ap_req->ticket.enc_part.kvno;
 958 #endif
 959         return 0;
 960 }
 961
 962 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
 963 {
 964 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
 965         return ap_req->ticket.enc_part.etype;
 966 #else /* MIT */
 967         return ap_req->ticket->enc_part.enctype;
 968 #endif
 969 }
 970 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
 971
 972 static krb5_error_code
 973 get_key_from_keytab(krb5_context context,
 974                     krb5_const_principal server,
 975                     krb5_enctype enctype,
 976                     krb5_kvno kvno,
 977                     krb5_keyblock **out_key)
 978 {
 979         krb5_keytab_entry entry;
 980         krb5_error_code ret;
 981         krb5_keytab keytab;
 982         char *name = NULL;
 983         krb5_keyblock *keyp;
 984
 985         /* We have to open a new keytab handle here, as MIT does
 986            an implicit open/getnext/close on krb5_kt_get_entry. We
 987            may be in the middle of a keytab enumeration when this is
 988            called. JRA. */
 989
 990         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
 991         if (ret) {
 992                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 993                 return ret;
 994         }
 995
 996         if ( DEBUGLEVEL >= 10 ) {
 997                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
 998                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
 999                                 kvno, enctype, name));
1000                         TALLOC_FREE(name);
1001                 }
1002         }
1003
1004         ret = krb5_kt_get_entry(context,
1005                                 keytab,
1006                                 server,
1007                                 kvno,
1008                                 enctype,
1009                                 &entry);
1010
1011         if (ret) {
1012                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1013                 goto out;
1014         }
1015
1016         keyp = KRB5_KT_KEY(&entry);
1017
1018         ret = krb5_copy_keyblock(context, keyp, out_key);
1019         if (ret) {
1020                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1021                 goto out;
1022         }
1023
1024         smb_krb5_kt_free_entry(context, &entry);
1025
1026 out:
1027         krb5_kt_close(context, keytab);
1028         return ret;
1029 }
1030
1031 /* Prototypes */
1032
1033  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1034                                                  const krb5_data *inbuf,
1035                                                  krb5_kvno *kvno,
1036                                                  krb5_enctype *enctype)
1037 {
1038 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1039         {
1040                 krb5_error_code ret;
1041                 krb5_ap_req ap_req;
1042
1043                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1044                 if (ret)
1045                         return ret;
1046
1047                 *kvno = get_kvno_from_ap_req(&ap_req);
1048                 *enctype = get_enctype_from_ap_req(&ap_req);
1049
1050                 free_AP_REQ(&ap_req);
1051                 return 0;
1052         }
1053 #endif
1054
1055         /* Possibly not an appropriate error code. */
1056         return KRB5KDC_ERR_BADOPTION;
1057 }
1058
1059  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1060                                                         krb5_auth_context *auth_context,
1061                                                         const krb5_data *inbuf,
1062                                                         krb5_const_principal server,
1063                                                         krb5_keytab keytab,
1064                                                         krb5_flags *ap_req_options,
1065                                                         krb5_ticket **ticket,
1066                                                         krb5_keyblock **keyblock)
1067 {
1068         krb5_error_code ret;
1069         krb5_kvno kvno;
1070         krb5_enctype enctype;
1071         krb5_keyblock *local_keyblock;
1072
1073         ret = krb5_rd_req(context,
1074                           auth_context,
1075                           inbuf,
1076                           server,
1077                           keytab,
1078                           ap_req_options,
1079                           ticket);
1080         if (ret) {
1081                 return ret;
1082         }
1083
1084 #ifdef KRB5_TICKET_HAS_KEYINFO
1085         enctype = (*ticket)->enc_part.enctype;
1086         kvno = (*ticket)->enc_part.kvno;
1087 #else
1088         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1089         if (ret) {
1090                 return ret;
1091         }
1092 #endif
1093
1094         ret = get_key_from_keytab(context,
1095                                   server,
1096                                   enctype,
1097                                   kvno,
1098                                   &local_keyblock);
1099         if (ret) {
1100                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1101                 goto out;
1102         }
1103
1104 out:
1105         if (ret && local_keyblock != NULL) {
1106                 krb5_free_keyblock(context, local_keyblock);
1107         } else {
1108                 *keyblock = local_keyblock;
1109         }
1110
1111         return ret;
1112 }
1113
1114  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1115                                        const char *client_string,       /* gd@BER.SUSE.DE */
1116                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1117                                        time_t *expire_time)
1118 {
1119         krb5_error_code ret;
1120         krb5_context context = NULL;
1121         krb5_ccache ccache = NULL;
1122         krb5_principal client = NULL;
1123         krb5_creds creds, creds_in, *creds_out = NULL;
1124
1125         ZERO_STRUCT(creds);
1126         ZERO_STRUCT(creds_in);
1127
1128         initialize_krb5_error_table();
1129         ret = krb5_init_context(&context);
1130         if (ret) {
1131                 goto done;
1132         }
1133
1134         if (!ccache_string) {
1135                 ccache_string = krb5_cc_default_name(context);
1136         }
1137
1138         if (!ccache_string) {
1139                 ret = EINVAL;
1140                 goto done;
1141         }
1142
1143         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1144
1145         /* FIXME: we should not fall back to defaults */
1146         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
1147         if (ret) {
1148                 goto done;
1149         }
1150
1151         if (client_string) {
1152                 ret = smb_krb5_parse_name(context, client_string, &client);
1153                 if (ret) {
1154                         goto done;
1155                 }
1156         } else {
1157                 ret = krb5_cc_get_principal(context, ccache, &client);
1158                 if (ret) {
1159                         goto done;
1160                 }
1161         }
1162
1163 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1164         {
1165                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
1166                 if (ret) {
1167                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1168                         goto done;
1169                 }
1170         }
1171 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1172         {
1173                 krb5_kdc_flags flags;
1174                 krb5_realm *client_realm = NULL;
1175
1176                 ret = krb5_copy_principal(context, client, &creds_in.client);
1177                 if (ret) {
1178                         goto done;
1179                 }
1180
1181                 if (service_string) {
1182                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1183                         if (ret) {
1184                                 goto done;
1185                         }
1186                 } else {
1187                         /* build tgt service by default */
1188                         client_realm = krb5_princ_realm(context, creds_in.client);
1189                         if (!client_realm) {
1190                                 ret = ENOMEM;
1191                                 goto done;
1192                         }
1193                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1194                         if (ret) {
1195                                 goto done;
1196                         }
1197                 }
1198
1199                 flags.i = 0;
1200                 flags.b.renewable = flags.b.renew = True;
1201
1202                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1203                 if (ret) {
1204                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1205                         goto done;
1206                 }
1207
1208                 creds = *creds_out;
1209         }
1210 #else
1211 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1212 #endif
1213
1214         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1215         ret = krb5_cc_initialize(context, ccache, client);
1216         if (ret) {
1217                 goto done;
1218         }
1219
1220         ret = krb5_cc_store_cred(context, ccache, &creds);
1221
1222         if (expire_time) {
1223                 *expire_time = (time_t) creds.times.endtime;
1224         }
1225
1226 done:
1227         krb5_free_cred_contents(context, &creds_in);
1228
1229         if (creds_out) {
1230                 krb5_free_creds(context, creds_out);
1231         } else {
1232                 krb5_free_cred_contents(context, &creds);
1233         }
1234
1235         if (client) {
1236                 krb5_free_principal(context, client);
1237         }
1238         if (ccache) {
1239                 krb5_cc_close(context, ccache);
1240         }
1241         if (context) {
1242                 krb5_free_context(context);
1243         }
1244
1245         return ret;
1246 }
1247
1248  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1249 {
1250         krb5_error_code ret = 0;
1251         if (addr == NULL) {
1252                 return ret;
1253         }
1254 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1255         krb5_free_addresses(context, addr->addrs);
1256 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1257         ret = krb5_free_addresses(context, addr->addrs);
1258         SAFE_FREE(addr->addrs);
1259 #endif
1260         SAFE_FREE(addr);
1261         addr = NULL;
1262         return ret;
1263 }
1264
1265  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1266 {
1267         krb5_error_code ret = 0;
1268         nstring buf;
1269 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1270         krb5_address **addrs = NULL;
1271 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1272         krb5_addresses *addrs = NULL;
1273 #endif
1274
1275         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1276         if (*kerb_addr == NULL) {
1277                 return ENOMEM;
1278         }
1279
1280         put_name(buf, lp_netbios_name(), ' ', 0x20);
1281
1282 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1283         {
1284                 int num_addr = 2;
1285
1286                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1287                 if (addrs == NULL) {
1288                         SAFE_FREE(*kerb_addr);
1289                         return ENOMEM;
1290                 }
1291
1292                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1293
1294                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1295                 if (addrs[0] == NULL) {
1296                         SAFE_FREE(addrs);
1297                         SAFE_FREE(*kerb_addr);
1298                         return ENOMEM;
1299                 }
1300
1301                 addrs[0]->magic = KV5M_ADDRESS;
1302                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1303                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1304                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1305                 if (addrs[0]->contents == NULL) {
1306                         SAFE_FREE(addrs[0]);
1307                         SAFE_FREE(addrs);
1308                         SAFE_FREE(*kerb_addr);
1309                         return ENOMEM;
1310                 }
1311
1312                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1313
1314                 addrs[1] = NULL;
1315         }
1316 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1317         {
1318                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1319                 if (addrs == NULL) {
1320                         SAFE_FREE(*kerb_addr);
1321                         return ENOMEM;
1322                 }
1323
1324                 memset(addrs, 0, sizeof(krb5_addresses));
1325
1326                 addrs->len = 1;
1327                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1328                 if (addrs->val == NULL) {
1329                         SAFE_FREE(addrs);
1330                         SAFE_FREE(kerb_addr);
1331                         return ENOMEM;
1332                 }
1333
1334                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1335                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1336                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1337                 if (addrs->val[0].address.data == NULL) {
1338                         SAFE_FREE(addrs->val);
1339                         SAFE_FREE(addrs);
1340                         SAFE_FREE(*kerb_addr);
1341                         return ENOMEM;
1342                 }
1343
1344                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1345         }
1346 #else
1347 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1348 #endif
1349         (*kerb_addr)->addrs = addrs;
1350
1351         return ret;
1352 }
1353
1354  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1355 {
1356 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1357         krb5_free_error_contents(context, krberror);
1358 #else /* MIT */
1359         krb5_free_error(context, krberror);
1360 #endif
1361 }
1362
1363  krb5_error_code handle_krberror_packet(krb5_context context,
1364                                         krb5_data *packet)
1365 {
1366         krb5_error_code ret;
1367         bool got_error_code = False;
1368
1369         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1370
1371 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1372         {
1373                 krb5_error krberror;
1374
1375                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1376                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1377                                 error_message(ret)));
1378                         return ret;
1379                 }
1380
1381                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1382                         ret = (krb5_error_code) krberror.error_code;
1383                         got_error_code = True;
1384                 }
1385
1386                 smb_krb5_free_error(context, &krberror);
1387         }
1388 #else /* MIT */
1389         {
1390                 krb5_error *krberror;
1391
1392                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1393                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1394                                 error_message(ret)));
1395                         return ret;
1396                 }
1397
1398                 if (krberror->e_data.data == NULL) {
1399 #if defined(ERROR_TABLE_BASE_krb5)
1400                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1401 #else
1402                         ret = (krb5_error_code)krberror->error;
1403 #endif
1404                         got_error_code = True;
1405                 }
1406                 smb_krb5_free_error(context, krberror);
1407         }
1408 #endif
1409         if (got_error_code) {
1410                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1411                         error_message(ret), ret));
1412         }
1413         return ret;
1414 }
1415
1416  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1417                                             krb5_get_init_creds_opt **opt)
1418 {
1419 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1420         /* Heimdal or modern MIT version */
1421         return krb5_get_init_creds_opt_alloc(context, opt);
1422 #else
1423         /* Historical MIT version */
1424         krb5_get_init_creds_opt *my_opt;
1425
1426         *opt = NULL;
1427
1428         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1429                 return ENOMEM;
1430         }
1431
1432         krb5_get_init_creds_opt_init(my_opt);
1433
1434         *opt =  my_opt;
1435         return 0;
1436 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1437 }
1438
1439  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1440                                 krb5_get_init_creds_opt *opt)
1441 {
1442 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1443
1444 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1445         /* Modern MIT or Heimdal version */
1446         krb5_get_init_creds_opt_free(context, opt);
1447 #else
1448         /* Heimdal version */
1449         krb5_get_init_creds_opt_free(opt);
1450 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1451
1452 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1453         /* Historical MIT version */
1454         SAFE_FREE(opt);
1455         opt = NULL;
1456 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1457 }
1458
1459  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1460 {
1461         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1462 }
1463
1464
1465 /* caller needs to free etype_s */
1466  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1467                                             krb5_enctype enctype,
1468                                             char **etype_s)
1469 {
1470 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1471         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1472 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1473         char buf[256];
1474         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1475         if (ret) {
1476                 return ret;
1477         }
1478         *etype_s = SMB_STRDUP(buf);
1479         if (!*etype_s) {
1480                 return ENOMEM;
1481         }
1482         return ret;
1483 #else
1484 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1485 #endif
1486 }
1487
1488  krb5_error_code smb_krb5_mk_error(krb5_context context,
1489                                 krb5_error_code error_code,
1490                                 const krb5_principal server,
1491                                 krb5_data *reply)
1492 {
1493 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1494         /*
1495          * The MIT interface is *terrible*.
1496          * We have to construct this ourselves...
1497          */
1498         krb5_error e;
1499
1500         memset(&e, 0, sizeof(e));
1501         krb5_us_timeofday(context, &e.stime, &e.susec);
1502         e.server = server;
1503 #if defined(krb5_err_base)
1504         e.error = error_code - krb5_err_base;
1505 #elif defined(ERROR_TABLE_BASE_krb5)
1506         e.error = error_code - ERROR_TABLE_BASE_krb5;
1507 #else
1508         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1509 #endif
1510
1511         return krb5_mk_error(context, &e, reply);
1512 #else /* Heimdal. */
1513         return krb5_mk_error(context,
1514                                 error_code,
1515                                 NULL,
1516                                 NULL, /* e_data */
1517                                 NULL,
1518                                 server,
1519                                 NULL,
1520                                 NULL,
1521                                 reply);
1522 #endif
1523 }
1524
1525 /**********************************************************************
1526  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1527  * allows to process non-default keytab names.
1528  * @param context krb5_context
1529  * @param keytab_name_req string
1530  * @param write_access bool if writable keytab is required
1531  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1532  * @return krb5_error_code
1533 **********************************************************************/
1534
1535 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1536 #ifndef MAX_KEYTAB_NAME_LEN
1537 #define MAX_KEYTAB_NAME_LEN 1100
1538 #endif
1539
1540  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1541                                       const char *keytab_name_req,
1542                                       bool write_access,
1543                                       krb5_keytab *keytab)
1544 {
1545         krb5_error_code ret = 0;
1546         TALLOC_CTX *mem_ctx;
1547         char keytab_string[MAX_KEYTAB_NAME_LEN];
1548         char *kt_str = NULL;
1549         bool found_valid_name = False;
1550         const char *pragma = "FILE";
1551         const char *tmp = NULL;
1552
1553         if (!write_access && !keytab_name_req) {
1554                 /* caller just wants to read the default keytab readonly, so be it */
1555                 return krb5_kt_default(context, keytab);
1556         }
1557
1558         mem_ctx = talloc_init("smb_krb5_open_keytab");
1559         if (!mem_ctx) {
1560                 return ENOMEM;
1561         }
1562
1563 #ifdef HAVE_WRFILE_KEYTAB
1564         if (write_access) {
1565                 pragma = "WRFILE";
1566         }
1567 #endif
1568
1569         if (keytab_name_req) {
1570
1571                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1572                         ret = KRB5_CONFIG_NOTENUFSPACE;
1573                         goto out;
1574                 }
1575
1576                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1577                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1578                         tmp = keytab_name_req;
1579                         goto resolve;
1580                 }
1581
1582                 if (keytab_name_req[0] != '/') {
1583                         ret = KRB5_KT_BADNAME;
1584                         goto out;
1585                 }
1586
1587                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1588                 if (!tmp) {
1589                         ret = ENOMEM;
1590                         goto out;
1591                 }
1592
1593                 goto resolve;
1594         }
1595
1596         /* we need to handle more complex keytab_strings, like:
1597          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1598
1599         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1600         if (ret) {
1601                 goto out;
1602         }
1603
1604         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1605
1606         tmp = talloc_strdup(mem_ctx, keytab_string);
1607         if (!tmp) {
1608                 ret = ENOMEM;
1609                 goto out;
1610         }
1611
1612         if (strncmp(tmp, "ANY:", 4) == 0) {
1613                 tmp += 4;
1614         }
1615
1616         memset(&keytab_string, '\0', sizeof(keytab_string));
1617
1618         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1619                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1620                         found_valid_name = True;
1621                         tmp = kt_str;
1622                         tmp += 7;
1623                 }
1624
1625                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1626                         found_valid_name = True;
1627                         tmp = kt_str;
1628                         tmp += 5;
1629                 }
1630
1631                 if (tmp[0] == '/') {
1632                         /* Treat as a FILE: keytab definition. */
1633                         found_valid_name = true;
1634                 }
1635
1636                 if (found_valid_name) {
1637                         if (tmp[0] != '/') {
1638                                 ret = KRB5_KT_BADNAME;
1639                                 goto out;
1640                         }
1641
1642                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1643                         if (!tmp) {
1644                                 ret = ENOMEM;
1645                                 goto out;
1646                         }
1647                         break;
1648                 }
1649         }
1650
1651         if (!found_valid_name) {
1652                 ret = KRB5_KT_UNKNOWN_TYPE;
1653                 goto out;
1654         }
1655
1656  resolve:
1657         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1658         ret = krb5_kt_resolve(context, tmp, keytab);
1659
1660  out:
1661         TALLOC_FREE(mem_ctx);
1662         return ret;
1663 }
1664
1665 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1666                                      krb5_context context,
1667                                      krb5_keytab keytab,
1668                                      const char **keytab_name)
1669 {
1670         char keytab_string[MAX_KEYTAB_NAME_LEN];
1671         krb5_error_code ret = 0;
1672
1673         ret = krb5_kt_get_name(context, keytab,
1674                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1675         if (ret) {
1676                 return ret;
1677         }
1678
1679         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1680         if (!*keytab_name) {
1681                 return ENOMEM;
1682         }
1683
1684         return ret;
1685 }
1686
1687 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1688     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1689     defined(HAVE_KRB5_GET_CREDS)
1690 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1691                                                              krb5_ccache ccache,
1692                                                              krb5_principal me,
1693                                                              krb5_principal server,
1694                                                              krb5_principal impersonate_princ,
1695                                                              krb5_creds **out_creds)
1696 {
1697         krb5_error_code ret;
1698         krb5_get_creds_opt opt;
1699
1700         ret = krb5_get_creds_opt_alloc(context, &opt);
1701         if (ret) {
1702                 goto done;
1703         }
1704         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1705
1706         if (impersonate_princ) {
1707                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1708                                                          impersonate_princ);
1709                 if (ret) {
1710                         goto done;
1711                 }
1712         }
1713
1714         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1715         if (ret) {
1716                 goto done;
1717         }
1718
1719  done:
1720         if (opt) {
1721                 krb5_get_creds_opt_free(context, opt);
1722         }
1723         return ret;
1724 }
1725 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1726
1727 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1728 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1729                                                          krb5_ccache ccache,
1730                                                          krb5_principal me,
1731                                                          krb5_principal server,
1732                                                          krb5_principal impersonate_princ,
1733                                                          krb5_creds **out_creds)
1734 {
1735         krb5_error_code ret;
1736         krb5_creds in_creds;
1737
1738 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1739 krb5_error_code KRB5_CALLCONV
1740 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1741                               krb5_ccache ccache, krb5_creds *in_creds,
1742                               krb5_data *subject_cert,
1743                               krb5_creds **out_creds);
1744 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1745
1746         ZERO_STRUCT(in_creds);
1747
1748         if (impersonate_princ) {
1749
1750                 in_creds.server = me;
1751                 in_creds.client = impersonate_princ;
1752
1753                 ret = krb5_get_credentials_for_user(context,
1754                                                     0, /* krb5_flags options */
1755                                                     ccache,
1756                                                     &in_creds,
1757                                                     NULL, /* krb5_data *subject_cert */
1758                                                     out_creds);
1759         } else {
1760                 in_creds.client = me;
1761                 in_creds.server = server;
1762
1763                 ret = krb5_get_credentials(context, 0, ccache,
1764                                            &in_creds, out_creds);
1765         }
1766
1767         return ret;
1768 }
1769 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1770
1771 /*
1772  * smb_krb5_get_credentials
1773  *
1774  * @brief Get krb5 credentials for a server
1775  *
1776  * @param[in] context           An initialized krb5_context
1777  * @param[in] ccache            An initialized krb5_ccache
1778  * @param[in] me                The krb5_principal of the caller
1779  * @param[in] server            The krb5_principal of the requested service
1780  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1781  * @param[out] out_creds        The returned krb5_creds structure
1782  * @return krb5_error_code
1783  *
1784  */
1785 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1786                                          krb5_ccache ccache,
1787                                          krb5_principal me,
1788                                          krb5_principal server,
1789                                          krb5_principal impersonate_princ,
1790                                          krb5_creds **out_creds)
1791 {
1792         krb5_error_code ret;
1793         krb5_creds *creds = NULL;
1794
1795         *out_creds = NULL;
1796
1797         if (impersonate_princ) {
1798 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1799                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1800 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1801                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1802 #else
1803                 ret = ENOTSUP;
1804 #endif
1805         } else {
1806                 krb5_creds in_creds;
1807
1808                 ZERO_STRUCT(in_creds);
1809
1810                 in_creds.client = me;
1811                 in_creds.server = server;
1812
1813                 ret = krb5_get_credentials(context, 0, ccache,
1814                                            &in_creds, &creds);
1815         }
1816         if (ret) {
1817                 goto done;
1818         }
1819
1820         ret = krb5_cc_store_cred(context, ccache, creds);
1821         if (ret) {
1822                 goto done;
1823         }
1824
1825         if (out_creds) {
1826                 *out_creds = creds;
1827         }
1828
1829  done:
1830         if (creds && ret) {
1831                 krb5_free_creds(context, creds);
1832         }
1833
1834         return ret;
1835 }
1836
1837 /*
1838  * smb_krb5_get_creds
1839  *
1840  * @brief Get krb5 credentials for a server
1841  *
1842  * @param[in] server_s          The string name of the service
1843  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
1844  * @param[in] cc                The krb5 credential cache string name (optional)
1845  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
1846  * @param[out] creds_p          The returned krb5_creds structure
1847  * @return krb5_error_code
1848  *
1849  */
1850 krb5_error_code smb_krb5_get_creds(const char *server_s,
1851                                    time_t time_offset,
1852                                    const char *cc,
1853                                    const char *impersonate_princ_s,
1854                                    krb5_creds **creds_p)
1855 {
1856         krb5_error_code ret;
1857         krb5_context context = NULL;
1858         krb5_principal me = NULL;
1859         krb5_principal server = NULL;
1860         krb5_principal impersonate_princ = NULL;
1861         krb5_creds *creds = NULL;
1862         krb5_ccache ccache = NULL;
1863
1864         *creds_p = NULL;
1865
1866         initialize_krb5_error_table();
1867         ret = krb5_init_context(&context);
1868         if (ret) {
1869                 goto done;
1870         }
1871
1872         if (time_offset != 0) {
1873                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
1874         }
1875
1876         ret = krb5_cc_resolve(context, cc ? cc :
1877                 krb5_cc_default_name(context), &ccache);
1878         if (ret) {
1879                 goto done;
1880         }
1881
1882         ret = krb5_cc_get_principal(context, ccache, &me);
1883         if (ret) {
1884                 goto done;
1885         }
1886
1887         ret = smb_krb5_parse_name(context, server_s, &server);
1888         if (ret) {
1889                 goto done;
1890         }
1891
1892         if (impersonate_princ_s) {
1893                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
1894                                           &impersonate_princ);
1895                 if (ret) {
1896                         goto done;
1897                 }
1898         }
1899
1900         ret = smb_krb5_get_credentials(context, ccache,
1901                                        me, server, impersonate_princ,
1902                                        &creds);
1903         if (ret) {
1904                 goto done;
1905         }
1906
1907         ret = krb5_cc_store_cred(context, ccache, creds);
1908         if (ret) {
1909                 goto done;
1910         }
1911
1912         if (creds_p) {
1913                 *creds_p = creds;
1914         }
1915
1916         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
1917                 server_s));
1918
1919         if (impersonate_princ_s) {
1920                 char *client = NULL;
1921
1922                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
1923                 if (ret) {
1924                         goto done;
1925                 }
1926                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
1927                         client));
1928                 TALLOC_FREE(client);
1929         }
1930
1931  done:
1932         if (!context) {
1933                 return ret;
1934         }
1935
1936         if (creds && ret) {
1937                 krb5_free_creds(context, creds);
1938         }
1939         if (server) {
1940                 krb5_free_principal(context, server);
1941         }
1942         if (me) {
1943                 krb5_free_principal(context, me);
1944         }
1945         if (impersonate_princ) {
1946                 krb5_free_principal(context, impersonate_princ);
1947         }
1948         if (ccache) {
1949                 krb5_cc_close(context, ccache);
1950         }
1951         krb5_free_context(context);
1952
1953         return ret;
1954 }
1955
1956 /*
1957  * smb_krb5_principal_get_realm
1958  *
1959  * @brief Get realm of a principal
1960  *
1961  * @param[in] context           The krb5_context
1962  * @param[in] principal         The principal
1963  * @return pointer to the realm
1964  *
1965  */
1966
1967 char *smb_krb5_principal_get_realm(krb5_context context,
1968                                    krb5_principal principal)
1969 {
1970 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
1971         return discard_const_p(char, krb5_principal_get_realm(context, principal));
1972 #elif defined(krb5_princ_realm) /* MIT */
1973         krb5_data *realm;
1974         realm = krb5_princ_realm(context, principal);
1975         return discard_const_p(char, realm->data);
1976 #else
1977         return NULL;
1978 #endif
1979 }
1980
1981 #else /* HAVE_KRB5 */
1982  /* this saves a few linking headaches */
1983  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
1984                         const char *principal, time_t time_offset,
1985                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
1986                         uint32_t extra_ap_opts,
1987                         const char *ccname, time_t *tgs_expire,
1988                         const char *impersonate_princ_s)
1989 {
1990          DEBUG(0,("NO KERBEROS SUPPORT\n"));
1991          return 1;
1992 }
1993
1994 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
1995 {
1996         DEBUG(0,("NO KERBEROS SUPPORT\n"));
1997         return false;
1998 }
1999
2000 #endif /* HAVE_KRB5 */