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 2005-2007
   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 #define KRB5_PRIVATE    1       /* this file uses PRIVATE interfaces! */
  24 #define KRB5_DEPRECATED 1       /* this file uses DEPRECATED interfaces! */
  25
  26 #include "includes.h"
  27
  28 #ifdef HAVE_KRB5
  29
  30 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  31 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  32 #define GSSAPI_CHECKSUM_SIZE (12+GSSAPI_BNDLENGTH)
  33
  34 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY)
  35 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
  36                                          krb5_auth_context *auth_context,
  37                                          krb5_creds *credsp,
  38                                          krb5_ccache ccache,
  39                                          krb5_data *authenticator);
  40 #endif
  41
  42 /**************************************************************
  43  Wrappers around kerberos string functions that convert from
  44  utf8 -> unix charset and vica versa.
  45 **************************************************************/
  46
  47 /**************************************************************
  48  krb5_parse_name that takes a UNIX charset.
  49 **************************************************************/
  50
  51  krb5_error_code smb_krb5_parse_name(krb5_context context,
  52                                 const char *name, /* in unix charset */
  53                                 krb5_principal *principal)
  54 {
  55         krb5_error_code ret;
  56         char *utf8_name;
  57         size_t converted_size;
  58
  59         if (!push_utf8_allocate(&utf8_name, name, &converted_size)) {
  60                 return ENOMEM;
  61         }
  62
  63         ret = krb5_parse_name(context, utf8_name, principal);
  64         SAFE_FREE(utf8_name);
  65         return ret;
  66 }
  67
  68 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
  69 /**************************************************************
  70  krb5_parse_name_norealm that takes a UNIX charset.
  71 **************************************************************/
  72
  73 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
  74                                 const char *name, /* in unix charset */
  75                                 krb5_principal *principal)
  76 {
  77         krb5_error_code ret;
  78         char *utf8_name;
  79         size_t converted_size;
  80
  81         *principal = NULL;
  82         if (!push_utf8_allocate(&utf8_name, name, &converted_size)) {
  83                 return ENOMEM;
  84         }
  85
  86         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  87         SAFE_FREE(utf8_name);
  88         return ret;
  89 }
  90 #endif
  91
  92 /**************************************************************
  93  krb5_parse_name that returns a UNIX charset name. Must
  94  be freed with normal free() call.
  95 **************************************************************/
  96
  97  krb5_error_code smb_krb5_unparse_name(krb5_context context,
  98                                         krb5_const_principal principal,
  99                                         char **unix_name)
 100 {
 101         krb5_error_code ret;
 102         char *utf8_name;
 103         size_t converted_size;
 104
 105         *unix_name = NULL;
 106         ret = krb5_unparse_name(context, principal, &utf8_name);
 107         if (ret) {
 108                 return ret;
 109         }
 110
 111         if (!pull_utf8_allocate(unix_name, utf8_name, &converted_size)) {
 112                 krb5_free_unparsed_name(context, utf8_name);
 113                 return ENOMEM;
 114         }
 115         krb5_free_unparsed_name(context, utf8_name);
 116         return 0;
 117 }
 118
 119 #ifndef HAVE_KRB5_SET_REAL_TIME
 120 /*
 121  * This function is not in the Heimdal mainline.
 122  */
 123  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 124 {
 125         krb5_error_code ret;
 126         int32_t sec, usec;
 127
 128         ret = krb5_us_timeofday(context, &sec, &usec);
 129         if (ret)
 130                 return ret;
 131
 132         context->kdc_sec_offset = seconds - sec;
 133         context->kdc_usec_offset = microseconds - usec;
 134
 135         return 0;
 136 }
 137 #endif
 138
 139 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 140
 141 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 142
 143 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 144  * to krb5_set_default_tgs_ktypes. See
 145  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 146  *
 147  * If the MIT libraries are not exporting internal symbols, we will end up in
 148  * this branch, which is correct. Otherwise we will continue to use the
 149  * internal symbol
 150  */
 151  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 152 {
 153     return krb5_set_default_tgs_enctypes(ctx, enc);
 154 }
 155
 156 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 157
 158 /* Heimdal */
 159  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 160 {
 161         return krb5_set_default_in_tkt_etypes(ctx, enc);
 162 }
 163
 164 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 165
 166 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 167
 168 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 169 /* HEIMDAL */
 170  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 171 {
 172         memset(pkaddr, '\0', sizeof(krb5_address));
 173 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 174         if (paddr->ss_family == AF_INET6) {
 175                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 176                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 177                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 178                 return true;
 179         }
 180 #endif
 181         if (paddr->ss_family == AF_INET) {
 182                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 183                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 184                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 185                 return true;
 186         }
 187         return false;
 188 }
 189 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 190 /* MIT */
 191  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 192 {
 193         memset(pkaddr, '\0', sizeof(krb5_address));
 194 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 195         if (paddr->ss_family == AF_INET6) {
 196                 pkaddr->addrtype = ADDRTYPE_INET6;
 197                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 198                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 199                 return true;
 200         }
 201 #endif
 202         if (paddr->ss_family == AF_INET) {
 203                 pkaddr->addrtype = ADDRTYPE_INET;
 204                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 205                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 206                 return true;
 207         }
 208         return false;
 209 }
 210 #else
 211 #error UNKNOWN_ADDRTYPE
 212 #endif
 213
 214 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 215 static int create_kerberos_key_from_string_direct(krb5_context context,
 216                                                   krb5_principal host_princ,
 217                                                   krb5_data *password,
 218                                                   krb5_keyblock *key,
 219                                                   krb5_enctype enctype)
 220 {
 221         int ret = 0;
 222         krb5_data salt;
 223         krb5_encrypt_block eblock;
 224
 225         ret = krb5_principal2salt(context, host_princ, &salt);
 226         if (ret) {
 227                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 228                 return ret;
 229         }
 230         krb5_use_enctype(context, &eblock, enctype);
 231         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 232         SAFE_FREE(salt.data);
 233
 234         return ret;
 235 }
 236 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 237 static int create_kerberos_key_from_string_direct(krb5_context context,
 238                                                   krb5_principal host_princ,
 239                                                   krb5_data *password,
 240                                                   krb5_keyblock *key,
 241                                                   krb5_enctype enctype)
 242 {
 243         int ret;
 244         krb5_salt salt;
 245
 246         ret = krb5_get_pw_salt(context, host_princ, &salt);
 247         if (ret) {
 248                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 249                 return ret;
 250         }
 251
 252         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 253         krb5_free_salt(context, salt);
 254
 255         return ret;
 256 }
 257 #else
 258 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 259 #endif
 260
 261  int create_kerberos_key_from_string(krb5_context context,
 262                                         krb5_principal host_princ,
 263                                         krb5_data *password,
 264                                         krb5_keyblock *key,
 265                                         krb5_enctype enctype,
 266                                         bool no_salt)
 267 {
 268         krb5_principal salt_princ = NULL;
 269         int ret;
 270         /*
 271          * Check if we've determined that the KDC is salting keys for this
 272          * principal/enctype in a non-obvious way.  If it is, try to match
 273          * its behavior.
 274          */
 275         if (no_salt) {
 276                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 277                 if (!KRB5_KEY_DATA(key)) {
 278                         return ENOMEM;
 279                 }
 280                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 281                 KRB5_KEY_LENGTH(key) = password->length;
 282                 KRB5_KEY_TYPE(key) = enctype;
 283                 return 0;
 284         }
 285         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 286         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 287         if (salt_princ) {
 288                 krb5_free_principal(context, salt_princ);
 289         }
 290         return ret;
 291 }
 292
 293 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 294  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 295                                             krb5_enctype **enctypes)
 296 {
 297         return krb5_get_permitted_enctypes(context, enctypes);
 298 }
 299 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 300  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 301                                             krb5_enctype **enctypes)
 302 {
 303         return krb5_get_default_in_tkt_etypes(context, enctypes);
 304 }
 305 #else
 306 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 307 #endif
 308
 309 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 310  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 311                                         krb5_auth_context auth_context,
 312                                         krb5_keyblock *keyblock)
 313 {
 314         return krb5_auth_con_setkey(context, auth_context, keyblock);
 315 }
 316 #endif
 317
 318 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 319                            DATA_BLOB *edata,
 320                            DATA_BLOB *edata_out)
 321 {
 322         DATA_BLOB edata_contents;
 323         ASN1_DATA *data;
 324         int edata_type;
 325
 326         if (!edata->length) {
 327                 return False;
 328         }
 329
 330         data = asn1_init(mem_ctx);
 331         if (data == NULL) {
 332                 return false;
 333         }
 334
 335         asn1_load(data, *edata);
 336         asn1_start_tag(data, ASN1_SEQUENCE(0));
 337         asn1_start_tag(data, ASN1_CONTEXT(1));
 338         asn1_read_Integer(data, &edata_type);
 339
 340         if (edata_type != KRB5_PADATA_PW_SALT) {
 341                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 342                         KRB5_PADATA_PW_SALT, edata_type));
 343                 asn1_free(data);
 344                 return False;
 345         }
 346
 347         asn1_start_tag(data, ASN1_CONTEXT(2));
 348         asn1_read_OctetString(data, NULL, &edata_contents);
 349         asn1_end_tag(data);
 350         asn1_end_tag(data);
 351         asn1_end_tag(data);
 352         asn1_free(data);
 353
 354         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 355
 356         data_blob_free(&edata_contents);
 357
 358         return True;
 359 }
 360
 361
 362 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 363 {
 364         DATA_BLOB pac_contents;
 365         ASN1_DATA *data;
 366         int data_type;
 367
 368         if (!auth_data->length) {
 369                 return False;
 370         }
 371
 372         data = asn1_init(mem_ctx);
 373         if (data == NULL) {
 374                 return false;
 375         }
 376
 377         asn1_load(data, *auth_data);
 378         asn1_start_tag(data, ASN1_SEQUENCE(0));
 379         asn1_start_tag(data, ASN1_SEQUENCE(0));
 380         asn1_start_tag(data, ASN1_CONTEXT(0));
 381         asn1_read_Integer(data, &data_type);
 382
 383         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 384                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 385                 asn1_free(data);
 386                 return False;
 387         }
 388
 389         asn1_end_tag(data);
 390         asn1_start_tag(data, ASN1_CONTEXT(1));
 391         asn1_read_OctetString(data, NULL, &pac_contents);
 392         asn1_end_tag(data);
 393         asn1_end_tag(data);
 394         asn1_end_tag(data);
 395         asn1_free(data);
 396
 397         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 398
 399         data_blob_free(&pac_contents);
 400
 401         return True;
 402 }
 403
 404  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 405 {
 406         DATA_BLOB auth_data_wrapped;
 407         bool got_auth_data_pac = False;
 408         int i;
 409
 410 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 411         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 412             tkt->enc_part2->authorization_data[0] &&
 413             tkt->enc_part2->authorization_data[0]->length)
 414         {
 415                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 416
 417                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 418                             KRB5_AUTHDATA_IF_RELEVANT) {
 419                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 420                                         tkt->enc_part2->authorization_data[i]->ad_type));
 421                                 continue;
 422                         }
 423
 424                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 425                                                       tkt->enc_part2->authorization_data[i]->length);
 426
 427                         /* check if it is a PAC */
 428                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 429                         data_blob_free(&auth_data_wrapped);
 430
 431                         if (got_auth_data_pac) {
 432                                 return true;
 433                         }
 434                 }
 435
 436                 return got_auth_data_pac;
 437         }
 438
 439 #else
 440         if (tkt->ticket.authorization_data &&
 441             tkt->ticket.authorization_data->len)
 442         {
 443                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 444
 445                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 446                             KRB5_AUTHDATA_IF_RELEVANT) {
 447                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 448                                         tkt->ticket.authorization_data->val[i].ad_type));
 449                                 continue;
 450                         }
 451
 452                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 453                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 454
 455                         /* check if it is a PAC */
 456                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 457                         data_blob_free(&auth_data_wrapped);
 458
 459                         if (got_auth_data_pac) {
 460                                 return true;
 461                         }
 462                 }
 463
 464                 return got_auth_data_pac;
 465         }
 466 #endif
 467         return False;
 468 }
 469
 470  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 471 {
 472 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 473         return tkt->enc_part2->client;
 474 #else
 475         return tkt->client;
 476 #endif
 477 }
 478
 479 #if !defined(HAVE_KRB5_LOCATE_KDC)
 480
 481 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 482  * to a public interface for this functionality, so we have to be able to live
 483  * without it if the MIT libraries are hiding their internal symbols.
 484  */
 485
 486 #if defined(KRB5_KRBHST_INIT)
 487 /* Heimdal */
 488  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 489 {
 490         krb5_krbhst_handle hnd;
 491         krb5_krbhst_info *hinfo;
 492         krb5_error_code rc;
 493         int num_kdcs, i;
 494         struct sockaddr *sa;
 495         struct addrinfo *ai;
 496
 497         *addr_pp = NULL;
 498         *naddrs = 0;
 499
 500         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 501         if (rc) {
 502                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 503                 return rc;
 504         }
 505
 506         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 507                 ;
 508
 509         krb5_krbhst_reset(ctx, hnd);
 510
 511         if (!num_kdcs) {
 512                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 513                 krb5_krbhst_free(ctx, hnd);
 514                 return -1;
 515         }
 516
 517         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 518         if (!sa) {
 519                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 520                 krb5_krbhst_free(ctx, hnd);
 521                 naddrs = 0;
 522                 return -1;
 523         }
 524
 525         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 526
 527         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 528
 529 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 530                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 531                 if (rc) {
 532                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 533                         continue;
 534                 }
 535 #endif
 536                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 537                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 538         }
 539
 540         krb5_krbhst_free(ctx, hnd);
 541
 542         *naddrs = num_kdcs;
 543         *addr_pp = sa;
 544         return 0;
 545 }
 546
 547 #else /* ! defined(KRB5_KRBHST_INIT) */
 548
 549  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 550                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 551 {
 552         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 553         return KRB5_KDC_UNREACH;
 554 }
 555
 556 #endif /* KRB5_KRBHST_INIT */
 557
 558 #else /* ! HAVE_KRB5_LOCATE_KDC */
 559
 560  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 561                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 562 {
 563         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 564 }
 565
 566 #endif /* HAVE_KRB5_LOCATE_KDC */
 567
 568 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 569  void krb5_free_unparsed_name(krb5_context context, char *val)
 570 {
 571         SAFE_FREE(val);
 572 }
 573 #endif
 574
 575  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 576 {
 577 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 578         if (pdata->data) {
 579                 krb5_free_data_contents(context, pdata);
 580         }
 581 #else
 582         SAFE_FREE(pdata->data);
 583 #endif
 584 }
 585
 586  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 587 {
 588 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 589         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 590 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 591         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 592 #else
 593 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 594 #endif
 595 }
 596
 597  bool kerberos_compatible_enctypes(krb5_context context,
 598                                   krb5_enctype enctype1,
 599                                   krb5_enctype enctype2)
 600 {
 601 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 602         krb5_boolean similar = 0;
 603
 604         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 605         return similar ? True : False;
 606 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 607         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 608 #endif
 609 }
 610
 611 static bool ads_cleanup_expired_creds(krb5_context context,
 612                                       krb5_ccache  ccache,
 613                                       krb5_creds  *credsp)
 614 {
 615         krb5_error_code retval;
 616         const char *cc_type = krb5_cc_get_type(context, ccache);
 617
 618         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 619                   cc_type, krb5_cc_get_name(context, ccache),
 620                   http_timestring(talloc_tos(), credsp->times.endtime)));
 621
 622         /* we will probably need new tickets if the current ones
 623            will expire within 10 seconds.
 624         */
 625         if (credsp->times.endtime >= (time(NULL) + 10))
 626                 return False;
 627
 628         /* heimdal won't remove creds from a file ccache, and
 629            perhaps we shouldn't anyway, since internally we
 630            use memory ccaches, and a FILE one probably means that
 631            we're using creds obtained outside of our exectuable
 632         */
 633         if (strequal(cc_type, "FILE")) {
 634                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 635                 return False;
 636         }
 637
 638         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 639         if (retval) {
 640                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 641                           error_message(retval)));
 642                 /* If we have an error in this, we want to display it,
 643                    but continue as though we deleted it */
 644         }
 645         return True;
 646 }
 647
 648 /*
 649   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 650 */
 651 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 652                                        krb5_auth_context *auth_context,
 653                                        const krb5_flags ap_req_options,
 654                                        const char *principal,
 655                                        krb5_ccache ccache,
 656                                        krb5_data *outbuf,
 657                                        time_t *expire_time)
 658 {
 659         krb5_error_code           retval;
 660         krb5_principal    server;
 661         krb5_creds              * credsp;
 662         krb5_creds                creds;
 663         krb5_data in_data;
 664         bool creds_ready = False;
 665         int i = 0, maxtries = 3;
 666
 667         ZERO_STRUCT(in_data);
 668
 669         retval = smb_krb5_parse_name(context, principal, &server);
 670         if (retval) {
 671                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 672                 return retval;
 673         }
 674
 675         /* obtain ticket & session key */
 676         ZERO_STRUCT(creds);
 677         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 678                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 679                          error_message(retval)));
 680                 goto cleanup_princ;
 681         }
 682
 683         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 684                 /* This can commonly fail on smbd startup with no ticket in the cache.
 685                  * Report at higher level than 1. */
 686                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 687                          error_message(retval)));
 688                 goto cleanup_creds;
 689         }
 690
 691         while (!creds_ready && (i < maxtries)) {
 692
 693                 if ((retval = krb5_get_credentials(context, 0, ccache,
 694                                                    &creds, &credsp))) {
 695                         DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
 696                                  principal, error_message(retval)));
 697                         goto cleanup_creds;
 698                 }
 699
 700                 /* cope with ticket being in the future due to clock skew */
 701                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 702                         time_t t = time(NULL);
 703                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 704                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 705                         krb5_set_real_time(context, t + time_offset + 1, 0);
 706                 }
 707
 708                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 709                         creds_ready = True;
 710                 }
 711
 712                 i++;
 713         }
 714
 715         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 716                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 717                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 718                   (unsigned)credsp->times.endtime));
 719
 720         if (expire_time) {
 721                 *expire_time = (time_t)credsp->times.endtime;
 722         }
 723
 724 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY)
 725         if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 726                 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 727                  as part of the kerberos exchange. */
 728
 729                 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 730
 731                 if( *auth_context == NULL ) {
 732                         /* Allocate if it has not yet been allocated. */
 733                         retval = krb5_auth_con_init( context, auth_context );
 734                         if (retval) {
 735                                 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n",
 736                                         error_message(retval)));
 737                                 goto cleanup_creds;
 738                         }
 739                 }
 740
 741                 retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock );
 742                 if (retval) {
 743                         DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setuseruserkey failed (%s)\n",
 744                                 error_message(retval)));
 745                         goto cleanup_creds;
 746                 }
 747
 748                 /* Must use a subkey for forwarded tickets. */
 749                 retval = krb5_auth_con_setflags( context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY);
 750                 if (retval) {
 751                         DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n",
 752                                 error_message(retval)));
 753                         goto cleanup_creds;
 754                 }
 755
 756                 retval = ads_krb5_get_fwd_ticket( context,
 757                                                 auth_context,
 758                                                 credsp,
 759                                                 ccache,
 760                                                 &in_data );
 761                 if (retval) {
 762                         DEBUG( 3, ("ads_krb5_get_fwd_ticket failed (%s)\n",
 763                                    error_message( retval ) ) );
 764
 765                         /*
 766                          * This is not fatal. Delete the *auth_context and continue
 767                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 768                          */
 769
 770                         if (in_data.data) {
 771                                 free( in_data.data );
 772                                 in_data.data = NULL;
 773                                 in_data.length = 0;
 774                         }
 775                         krb5_auth_con_free(context, *auth_context);
 776                         *auth_context = NULL;
 777                 }
 778         }
 779 #endif
 780
 781         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 782                                       &in_data, credsp, outbuf);
 783         if (retval) {
 784                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 785                          error_message(retval)));
 786         }
 787
 788         if (in_data.data) {
 789                 free( in_data.data );
 790                 in_data.length = 0;
 791         }
 792
 793         krb5_free_creds(context, credsp);
 794
 795 cleanup_creds:
 796         krb5_free_cred_contents(context, &creds);
 797
 798 cleanup_princ:
 799         krb5_free_principal(context, server);
 800
 801         return retval;
 802 }
 803
 804 /*
 805   get a kerberos5 ticket for the given service
 806 */
 807 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
 808                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 809                         uint32 extra_ap_opts, const char *ccname,
 810                         time_t *tgs_expire)
 811
 812 {
 813         krb5_error_code retval;
 814         krb5_data packet;
 815         krb5_context context = NULL;
 816         krb5_ccache ccdef = NULL;
 817         krb5_auth_context auth_context = NULL;
 818         krb5_enctype enc_types[] = {
 819 #ifdef ENCTYPE_ARCFOUR_HMAC
 820                 ENCTYPE_ARCFOUR_HMAC,
 821 #endif
 822                 ENCTYPE_DES_CBC_MD5,
 823                 ENCTYPE_DES_CBC_CRC,
 824                 ENCTYPE_NULL};
 825
 826         initialize_krb5_error_table();
 827         retval = krb5_init_context(&context);
 828         if (retval) {
 829                 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
 830                          error_message(retval)));
 831                 goto failed;
 832         }
 833
 834         if (time_offset != 0) {
 835                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 836         }
 837
 838         if ((retval = krb5_cc_resolve(context, ccname ?
 839                         ccname : krb5_cc_default_name(context), &ccdef))) {
 840                 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
 841                          error_message(retval)));
 842                 goto failed;
 843         }
 844
 845         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 846                 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
 847                          error_message(retval)));
 848                 goto failed;
 849         }
 850
 851         if ((retval = ads_krb5_mk_req(context,
 852                                         &auth_context,
 853                                         AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 854                                         principal,
 855                                         ccdef, &packet,
 856                                         tgs_expire))) {
 857                 goto failed;
 858         }
 859
 860         get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
 861
 862         *ticket = data_blob(packet.data, packet.length);
 863
 864         kerberos_free_data_contents(context, &packet);
 865
 866 failed:
 867
 868         if ( context ) {
 869                 if (ccdef)
 870                         krb5_cc_close(context, ccdef);
 871                 if (auth_context)
 872                         krb5_auth_con_free(context, auth_context);
 873                 krb5_free_context(context);
 874         }
 875
 876         return retval;
 877 }
 878
 879  bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
 880  {
 881         krb5_keyblock *skey = NULL;
 882         krb5_error_code err = 0;
 883         bool ret = false;
 884
 885         if (remote) {
 886                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 887         } else {
 888                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 889         }
 890
 891         if (err || skey == NULL) {
 892                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 893                 goto done;
 894         }
 895
 896         DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
 897         *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 898         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 899
 900         ret = true;
 901
 902  done:
 903         if (skey) {
 904                 krb5_free_keyblock(context, skey);
 905         }
 906
 907         return ret;
 908  }
 909
 910
 911 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 912  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 913
 914  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 915 {
 916         static krb5_data kdata;
 917
 918         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 919         kdata.length = strlen((const char *)kdata.data);
 920         return &kdata;
 921 }
 922 #endif
 923
 924  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 925 {
 926 #if defined(HAVE_KRB5_KT_FREE_ENTRY)
 927         return krb5_kt_free_entry(context, kt_entry);
 928 #elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 929         return krb5_free_keytab_entry_contents(context, kt_entry);
 930 #else
 931 #error UNKNOWN_KT_FREE_FUNCTION
 932 #endif
 933 }
 934
 935  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 936                                      struct PAC_SIGNATURE_DATA *sig)
 937 {
 938 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 939         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 940         cksum->checksum.length  = sig->signature.length;
 941         cksum->checksum.data    = sig->signature.data;
 942 #else
 943         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 944         cksum->length           = sig->signature.length;
 945         cksum->contents         = sig->signature.data;
 946 #endif
 947 }
 948
 949  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 950                                           const krb5_keyblock *keyblock,
 951                                          krb5_keyusage usage,
 952                                          krb5_checksum *cksum,
 953                                          uint8 *data,
 954                                          size_t length)
 955 {
 956         krb5_error_code ret;
 957
 958         /* verify the checksum */
 959
 960         /* welcome to the wonderful world of samba's kerberos abstraction layer:
 961          *
 962          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
 963          * -----------------------------------------------------------------------------
 964          * krb5_c_verify_checksum       -                       works           works
 965          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
 966          */
 967
 968 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
 969         {
 970                 krb5_boolean checksum_valid = False;
 971                 krb5_data input;
 972
 973                 input.data = (char *)data;
 974                 input.length = length;
 975
 976                 ret = krb5_c_verify_checksum(context,
 977                                              keyblock,
 978                                              usage,
 979                                              &input,
 980                                              cksum,
 981                                              &checksum_valid);
 982                 if (ret) {
 983                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
 984                                 error_message(ret)));
 985                         return ret;
 986                 }
 987
 988                 if (!checksum_valid)
 989                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
 990         }
 991
 992 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
 993
 994         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
 995          * without enctype and it ignores any key_usage types - Guenther */
 996
 997         {
 998
 999                 krb5_crypto crypto;
1000                 ret = krb5_crypto_init(context,
1001                                        keyblock,
1002                                        0,
1003                                        &crypto);
1004                 if (ret) {
1005                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1006                                 error_message(ret)));
1007                         return ret;
1008                 }
1009
1010                 ret = krb5_verify_checksum(context,
1011                                            crypto,
1012                                            usage,
1013                                            data,
1014                                            length,
1015                                            cksum);
1016
1017                 krb5_crypto_destroy(context, crypto);
1018         }
1019
1020 #else
1021 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1022 #endif
1023
1024         return ret;
1025 }
1026
1027  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1028 {
1029 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1030         return tkt->enc_part2->times.authtime;
1031 #else
1032         return tkt->ticket.authtime;
1033 #endif
1034 }
1035
1036 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1037 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1038 {
1039 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1040         if (ap_req->ticket->enc_part.kvno)
1041                 return ap_req->ticket->enc_part.kvno;
1042 #else /* Heimdal */
1043         if (ap_req->ticket.enc_part.kvno)
1044                 return *ap_req->ticket.enc_part.kvno;
1045 #endif
1046         return 0;
1047 }
1048
1049 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1050 {
1051 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1052         return ap_req->ticket.enc_part.etype;
1053 #else /* MIT */
1054         return ap_req->ticket->enc_part.enctype;
1055 #endif
1056 }
1057 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1058
1059 static krb5_error_code
1060 get_key_from_keytab(krb5_context context,
1061                     krb5_const_principal server,
1062                     krb5_enctype enctype,
1063                     krb5_kvno kvno,
1064                     krb5_keyblock **out_key)
1065 {
1066         krb5_keytab_entry entry;
1067         krb5_error_code ret;
1068         krb5_keytab keytab;
1069         char *name = NULL;
1070         krb5_keyblock *keyp;
1071
1072         /* We have to open a new keytab handle here, as MIT does
1073            an implicit open/getnext/close on krb5_kt_get_entry. We
1074            may be in the middle of a keytab enumeration when this is
1075            called. JRA. */
1076
1077         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1078         if (ret) {
1079                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1080                 return ret;
1081         }
1082
1083         if ( DEBUGLEVEL >= 10 ) {
1084                 if (smb_krb5_unparse_name(context, server, &name) == 0) {
1085                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1086                                 kvno, enctype, name));
1087                         SAFE_FREE(name);
1088                 }
1089         }
1090
1091         ret = krb5_kt_get_entry(context,
1092                                 keytab,
1093                                 server,
1094                                 kvno,
1095                                 enctype,
1096                                 &entry);
1097
1098         if (ret) {
1099                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1100                 goto out;
1101         }
1102
1103         keyp = KRB5_KT_KEY(&entry);
1104
1105         ret = krb5_copy_keyblock(context, keyp, out_key);
1106         if (ret) {
1107                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1108                 goto out;
1109         }
1110
1111         smb_krb5_kt_free_entry(context, &entry);
1112
1113 out:
1114         krb5_kt_close(context, keytab);
1115         return ret;
1116 }
1117
1118 /* Prototypes */
1119
1120  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1121                                                  const krb5_data *inbuf,
1122                                                  krb5_kvno *kvno,
1123                                                  krb5_enctype *enctype)
1124 {
1125 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1126         {
1127                 krb5_error_code ret;
1128                 krb5_ap_req ap_req;
1129
1130                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1131                 if (ret)
1132                         return ret;
1133
1134                 *kvno = get_kvno_from_ap_req(&ap_req);
1135                 *enctype = get_enctype_from_ap_req(&ap_req);
1136
1137                 free_AP_REQ(&ap_req);
1138                 return 0;
1139         }
1140 #endif
1141
1142         /* Possibly not an appropriate error code. */
1143         return KRB5KDC_ERR_BADOPTION;
1144 }
1145
1146  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1147                                                         krb5_auth_context *auth_context,
1148                                                         const krb5_data *inbuf,
1149                                                         krb5_const_principal server,
1150                                                         krb5_keytab keytab,
1151                                                         krb5_flags *ap_req_options,
1152                                                         krb5_ticket **ticket,
1153                                                         krb5_keyblock **keyblock)
1154 {
1155         krb5_error_code ret;
1156         krb5_kvno kvno;
1157         krb5_enctype enctype;
1158         krb5_keyblock *local_keyblock;
1159
1160         ret = krb5_rd_req(context,
1161                           auth_context,
1162                           inbuf,
1163                           server,
1164                           keytab,
1165                           ap_req_options,
1166                           ticket);
1167         if (ret) {
1168                 return ret;
1169         }
1170
1171 #ifdef KRB5_TICKET_HAS_KEYINFO
1172         enctype = (*ticket)->enc_part.enctype;
1173         kvno = (*ticket)->enc_part.kvno;
1174 #else
1175         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1176         if (ret) {
1177                 return ret;
1178         }
1179 #endif
1180
1181         ret = get_key_from_keytab(context,
1182                                   server,
1183                                   enctype,
1184                                   kvno,
1185                                   &local_keyblock);
1186         if (ret) {
1187                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1188                 goto out;
1189         }
1190
1191 out:
1192         if (ret && local_keyblock != NULL) {
1193                 krb5_free_keyblock(context, local_keyblock);
1194         } else {
1195                 *keyblock = local_keyblock;
1196         }
1197
1198         return ret;
1199 }
1200
1201  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1202                                             const char *name,
1203                                             krb5_principal *principal)
1204 {
1205 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1206         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1207 #endif
1208
1209         /* we are cheating here because parse_name will in fact set the realm.
1210          * We don't care as the only caller of smb_krb5_parse_name_norealm
1211          * ignores the realm anyway when calling
1212          * smb_krb5_principal_compare_any_realm later - Guenther */
1213
1214         return smb_krb5_parse_name(context, name, principal);
1215 }
1216
1217  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1218                                           krb5_const_principal princ1,
1219                                           krb5_const_principal princ2)
1220 {
1221 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1222
1223         return krb5_principal_compare_any_realm(context, princ1, princ2);
1224
1225 /* krb5_princ_size is a macro in MIT */
1226 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1227
1228         int i, len1, len2;
1229         const krb5_data *p1, *p2;
1230
1231         len1 = krb5_princ_size(context, princ1);
1232         len2 = krb5_princ_size(context, princ2);
1233
1234         if (len1 != len2)
1235                 return False;
1236
1237         for (i = 0; i < len1; i++) {
1238
1239                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1240                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1241
1242                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1243                         return False;
1244         }
1245
1246         return True;
1247 #else
1248 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1249 #endif
1250 }
1251
1252  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1253                                        const char *client_string,       /* gd@BER.SUSE.DE */
1254                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1255                                        time_t *expire_time)
1256 {
1257         krb5_error_code ret;
1258         krb5_context context = NULL;
1259         krb5_ccache ccache = NULL;
1260         krb5_principal client = NULL;
1261         krb5_creds creds, creds_in, *creds_out = NULL;
1262
1263         ZERO_STRUCT(creds);
1264         ZERO_STRUCT(creds_in);
1265
1266         initialize_krb5_error_table();
1267         ret = krb5_init_context(&context);
1268         if (ret) {
1269                 goto done;
1270         }
1271
1272         if (!ccache_string) {
1273                 ccache_string = krb5_cc_default_name(context);
1274         }
1275
1276         if (!ccache_string) {
1277                 ret = EINVAL;
1278                 goto done;
1279         }
1280
1281         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1282
1283         /* FIXME: we should not fall back to defaults */
1284         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1285         if (ret) {
1286                 goto done;
1287         }
1288
1289         if (client_string) {
1290                 ret = smb_krb5_parse_name(context, client_string, &client);
1291                 if (ret) {
1292                         goto done;
1293                 }
1294         } else {
1295                 ret = krb5_cc_get_principal(context, ccache, &client);
1296                 if (ret) {
1297                         goto done;
1298                 }
1299         }
1300
1301 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1302         {
1303                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1304                 if (ret) {
1305                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1306                         goto done;
1307                 }
1308         }
1309 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1310         {
1311                 krb5_kdc_flags flags;
1312                 krb5_realm *client_realm = NULL;
1313
1314                 ret = krb5_copy_principal(context, client, &creds_in.client);
1315                 if (ret) {
1316                         goto done;
1317                 }
1318
1319                 if (service_string) {
1320                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1321                         if (ret) {
1322                                 goto done;
1323                         }
1324                 } else {
1325                         /* build tgt service by default */
1326                         client_realm = krb5_princ_realm(context, creds_in.client);
1327                         if (!client_realm) {
1328                                 ret = ENOMEM;
1329                                 goto done;
1330                         }
1331                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1332                         if (ret) {
1333                                 goto done;
1334                         }
1335                 }
1336
1337                 flags.i = 0;
1338                 flags.b.renewable = flags.b.renew = True;
1339
1340                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1341                 if (ret) {
1342                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1343                         goto done;
1344                 }
1345
1346                 creds = *creds_out;
1347         }
1348 #else
1349 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1350 #endif
1351
1352         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1353         ret = krb5_cc_initialize(context, ccache, client);
1354         if (ret) {
1355                 goto done;
1356         }
1357
1358         ret = krb5_cc_store_cred(context, ccache, &creds);
1359
1360         if (expire_time) {
1361                 *expire_time = (time_t) creds.times.endtime;
1362         }
1363
1364 done:
1365         krb5_free_cred_contents(context, &creds_in);
1366
1367         if (creds_out) {
1368                 krb5_free_creds(context, creds_out);
1369         } else {
1370                 krb5_free_cred_contents(context, &creds);
1371         }
1372
1373         if (client) {
1374                 krb5_free_principal(context, client);
1375         }
1376         if (ccache) {
1377                 krb5_cc_close(context, ccache);
1378         }
1379         if (context) {
1380                 krb5_free_context(context);
1381         }
1382
1383         return ret;
1384 }
1385
1386  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1387 {
1388         krb5_error_code ret = 0;
1389         if (addr == NULL) {
1390                 return ret;
1391         }
1392 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1393         krb5_free_addresses(context, addr->addrs);
1394 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1395         ret = krb5_free_addresses(context, addr->addrs);
1396         SAFE_FREE(addr->addrs);
1397 #endif
1398         SAFE_FREE(addr);
1399         addr = NULL;
1400         return ret;
1401 }
1402
1403  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1404 {
1405         krb5_error_code ret = 0;
1406         nstring buf;
1407 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1408         krb5_address **addrs = NULL;
1409 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1410         krb5_addresses *addrs = NULL;
1411 #endif
1412
1413         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1414         if (*kerb_addr == NULL) {
1415                 return ENOMEM;
1416         }
1417
1418         put_name(buf, global_myname(), ' ', 0x20);
1419
1420 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1421         {
1422                 int num_addr = 2;
1423
1424                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1425                 if (addrs == NULL) {
1426                         SAFE_FREE(*kerb_addr);
1427                         return ENOMEM;
1428                 }
1429
1430                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1431
1432                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1433                 if (addrs[0] == NULL) {
1434                         SAFE_FREE(addrs);
1435                         SAFE_FREE(*kerb_addr);
1436                         return ENOMEM;
1437                 }
1438
1439                 addrs[0]->magic = KV5M_ADDRESS;
1440                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1441                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1442                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1443                 if (addrs[0]->contents == NULL) {
1444                         SAFE_FREE(addrs[0]);
1445                         SAFE_FREE(addrs);
1446                         SAFE_FREE(*kerb_addr);
1447                         return ENOMEM;
1448                 }
1449
1450                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1451
1452                 addrs[1] = NULL;
1453         }
1454 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1455         {
1456                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1457                 if (addrs == NULL) {
1458                         SAFE_FREE(*kerb_addr);
1459                         return ENOMEM;
1460                 }
1461
1462                 memset(addrs, 0, sizeof(krb5_addresses));
1463
1464                 addrs->len = 1;
1465                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1466                 if (addrs->val == NULL) {
1467                         SAFE_FREE(addrs);
1468                         SAFE_FREE(kerb_addr);
1469                         return ENOMEM;
1470                 }
1471
1472                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1473                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1474                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1475                 if (addrs->val[0].address.data == NULL) {
1476                         SAFE_FREE(addrs->val);
1477                         SAFE_FREE(addrs);
1478                         SAFE_FREE(*kerb_addr);
1479                         return ENOMEM;
1480                 }
1481
1482                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1483         }
1484 #else
1485 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1486 #endif
1487         (*kerb_addr)->addrs = addrs;
1488
1489         return ret;
1490 }
1491
1492  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1493 {
1494 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1495         krb5_free_error_contents(context, krberror);
1496 #else /* MIT */
1497         krb5_free_error(context, krberror);
1498 #endif
1499 }
1500
1501  krb5_error_code handle_krberror_packet(krb5_context context,
1502                                         krb5_data *packet)
1503 {
1504         krb5_error_code ret;
1505         bool got_error_code = False;
1506
1507         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1508
1509 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1510         {
1511                 krb5_error krberror;
1512
1513                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1514                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1515                                 error_message(ret)));
1516                         return ret;
1517                 }
1518
1519                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1520                         ret = (krb5_error_code) krberror.error_code;
1521                         got_error_code = True;
1522                 }
1523
1524                 smb_krb5_free_error(context, &krberror);
1525         }
1526 #else /* MIT */
1527         {
1528                 krb5_error *krberror;
1529
1530                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1531                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1532                                 error_message(ret)));
1533                         return ret;
1534                 }
1535
1536                 if (krberror->e_data.data == NULL) {
1537                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1538                         got_error_code = True;
1539                 }
1540                 smb_krb5_free_error(context, krberror);
1541         }
1542 #endif
1543         if (got_error_code) {
1544                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1545                         error_message(ret), ret));
1546         }
1547         return ret;
1548 }
1549
1550  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1551                                             krb5_get_init_creds_opt **opt)
1552 {
1553 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1554         /* Heimdal or modern MIT version */
1555         return krb5_get_init_creds_opt_alloc(context, opt);
1556 #else
1557         /* Historical MIT version */
1558         krb5_get_init_creds_opt *my_opt;
1559
1560         *opt = NULL;
1561
1562         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1563                 return ENOMEM;
1564         }
1565
1566         krb5_get_init_creds_opt_init(my_opt);
1567
1568         *opt =  my_opt;
1569         return 0;
1570 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1571 }
1572
1573  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1574                                 krb5_get_init_creds_opt *opt)
1575 {
1576 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1577
1578 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1579         /* Modern MIT or Heimdal version */
1580         krb5_get_init_creds_opt_free(context, opt);
1581 #else
1582         /* Heimdal version */
1583         krb5_get_init_creds_opt_free(opt);
1584 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1585
1586 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1587         /* Historical MIT version */
1588         SAFE_FREE(opt);
1589         opt = NULL;
1590 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1591 }
1592
1593  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1594 {
1595         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1596 }
1597
1598
1599 /* caller needs to free etype_s */
1600  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1601                                             krb5_enctype enctype,
1602                                             char **etype_s)
1603 {
1604 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1605         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1606 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1607         char buf[256];
1608         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1609         if (ret) {
1610                 return ret;
1611         }
1612         *etype_s = SMB_STRDUP(buf);
1613         if (!*etype_s) {
1614                 return ENOMEM;
1615         }
1616         return ret;
1617 #else
1618 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1619 #endif
1620 }
1621
1622  krb5_error_code smb_krb5_mk_error(krb5_context context,
1623                                 krb5_error_code error_code,
1624                                 const krb5_principal server,
1625                                 krb5_data *reply)
1626 {
1627 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1628         /*
1629          * The MIT interface is *terrible*.
1630          * We have to construct this ourselves...
1631          */
1632         krb5_error e;
1633
1634         memset(&e, 0, sizeof(e));
1635         krb5_us_timeofday(context, &e.stime, &e.susec);
1636         e.server = server;
1637 #if defined(krb5_err_base)
1638         e.error = error_code - krb5_err_base;
1639 #elif defined(ERROR_TABLE_BASE_krb5)
1640         e.error = error_code - ERROR_TABLE_BASE_krb5;
1641 #else
1642         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1643 #endif
1644
1645         return krb5_mk_error(context, &e, reply);
1646 #else /* Heimdal. */
1647         return krb5_mk_error(context,
1648                                 error_code,
1649                                 NULL,
1650                                 NULL, /* e_data */
1651                                 NULL,
1652                                 server,
1653                                 NULL,
1654                                 NULL,
1655                                 reply);
1656 #endif
1657 }
1658
1659 /**********************************************************************
1660  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1661  * allows to process non-default keytab names.
1662  * @param context krb5_context
1663  * @param keytab_name_req string
1664  * @param write_access bool if writable keytab is required
1665  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1666  * @return krb5_error_code
1667 **********************************************************************/
1668
1669 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1670 #ifndef MAX_KEYTAB_NAME_LEN
1671 #define MAX_KEYTAB_NAME_LEN 1100
1672 #endif
1673
1674  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1675                                       const char *keytab_name_req,
1676                                       bool write_access,
1677                                       krb5_keytab *keytab)
1678 {
1679         krb5_error_code ret = 0;
1680         TALLOC_CTX *mem_ctx;
1681         char keytab_string[MAX_KEYTAB_NAME_LEN];
1682         char *kt_str = NULL;
1683         bool found_valid_name = False;
1684         const char *pragma = "FILE";
1685         const char *tmp = NULL;
1686
1687         if (!write_access && !keytab_name_req) {
1688                 /* caller just wants to read the default keytab readonly, so be it */
1689                 return krb5_kt_default(context, keytab);
1690         }
1691
1692         mem_ctx = talloc_init("smb_krb5_open_keytab");
1693         if (!mem_ctx) {
1694                 return ENOMEM;
1695         }
1696
1697 #ifdef HAVE_WRFILE_KEYTAB
1698         if (write_access) {
1699                 pragma = "WRFILE";
1700         }
1701 #endif
1702
1703         if (keytab_name_req) {
1704
1705                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1706                         ret = KRB5_CONFIG_NOTENUFSPACE;
1707                         goto out;
1708                 }
1709
1710                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1711                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1712                         tmp = keytab_name_req;
1713                         goto resolve;
1714                 }
1715
1716                 if (keytab_name_req[0] != '/') {
1717                         ret = KRB5_KT_BADNAME;
1718                         goto out;
1719                 }
1720
1721                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1722                 if (!tmp) {
1723                         ret = ENOMEM;
1724                         goto out;
1725                 }
1726
1727                 goto resolve;
1728         }
1729
1730         /* we need to handle more complex keytab_strings, like:
1731          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1732
1733         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1734         if (ret) {
1735                 goto out;
1736         }
1737
1738         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1739
1740         tmp = talloc_strdup(mem_ctx, keytab_string);
1741         if (!tmp) {
1742                 ret = ENOMEM;
1743                 goto out;
1744         }
1745
1746         if (strncmp(tmp, "ANY:", 4) == 0) {
1747                 tmp += 4;
1748         }
1749
1750         memset(&keytab_string, '\0', sizeof(keytab_string));
1751
1752         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1753                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1754                         found_valid_name = True;
1755                         tmp = kt_str;
1756                         tmp += 7;
1757                 }
1758
1759                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1760                         found_valid_name = True;
1761                         tmp = kt_str;
1762                         tmp += 5;
1763                 }
1764
1765                 if (tmp[0] == '/') {
1766                         /* Treat as a FILE: keytab definition. */
1767                         found_valid_name = true;
1768                 }
1769
1770                 if (found_valid_name) {
1771                         if (tmp[0] != '/') {
1772                                 ret = KRB5_KT_BADNAME;
1773                                 goto out;
1774                         }
1775
1776                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1777                         if (!tmp) {
1778                                 ret = ENOMEM;
1779                                 goto out;
1780                         }
1781                         break;
1782                 }
1783         }
1784
1785         if (!found_valid_name) {
1786                 ret = KRB5_KT_UNKNOWN_TYPE;
1787                 goto out;
1788         }
1789
1790  resolve:
1791         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1792         ret = krb5_kt_resolve(context, tmp, keytab);
1793
1794  out:
1795         TALLOC_FREE(mem_ctx);
1796         return ret;
1797 }
1798
1799 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1800                                      krb5_context context,
1801                                      krb5_keytab keytab,
1802                                      const char **keytab_name)
1803 {
1804         char keytab_string[MAX_KEYTAB_NAME_LEN];
1805         krb5_error_code ret = 0;
1806
1807         ret = krb5_kt_get_name(context, keytab,
1808                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1809         if (ret) {
1810                 return ret;
1811         }
1812
1813         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1814         if (!*keytab_name) {
1815                 return ENOMEM;
1816         }
1817
1818         return ret;
1819 }
1820
1821 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY)
1822 /**************************************************************
1823 Routine: ads_krb5_get_fwd_ticket
1824  Description:
1825     When a service ticket is flagged as trusted
1826     for delegation we should provide a forwardable
1827     ticket so that the remote host can act on our
1828     behalf.  This is done by taking the 2nd forwardable
1829     TGT and storing it in the GSS-API authenticator
1830     "checksum".  This routine will populate
1831     the krb5_data authenticator with this TGT.
1832  Parameters:
1833     krb5_context context: The kerberos context for this authentication.
1834     krb5_auth_context:    The authentication context.
1835     krb5_creds *credsp:   The ticket credentials (AS-REP).
1836     krb5_ccache ccache:   The credentials cache.
1837     krb5_data &authenticator: The checksum field that will store the TGT, and
1838      authenticator.data must be freed by the caller.
1839
1840  Returns:
1841     krb5_error_code: 0 if no errors, otherwise set.
1842 **************************************************************/
1843
1844 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1845                                          krb5_auth_context *auth_context,
1846                                          krb5_creds *credsp,
1847                                          krb5_ccache ccache,
1848                                          krb5_data *authenticator)
1849 {
1850         krb5_data fwdData;
1851         krb5_error_code retval = 0;
1852         char *pChksum = NULL;
1853         char *p = NULL;
1854
1855         ZERO_STRUCT(fwdData);
1856         ZERO_STRUCTP(authenticator);
1857
1858         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1859                                 *auth_context,  /* Authentication context [in] */
1860                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
1861                                 credsp->client, /* Client principal for the tgt [in] */
1862                                 credsp->server, /* Server principal for the tgt [in] */
1863                                 ccache,         /* Credential cache to use for storage [in] */
1864                                 1,              /* Turn on for "Forwardable ticket" [in] */
1865                                 &fwdData );     /* Resulting response [out] */
1866
1867
1868         if (retval) {
1869                 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1870                         error_message(retval)));
1871                 goto out;
1872         }
1873
1874         if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1875                 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1876                 retval = EINVAL;
1877                 goto out;
1878         }
1879
1880         /* We're going to allocate a gssChecksum structure with a little
1881            extra data the length of the kerberos credentials length
1882            (APPLICATION 22) so that we can pack it on the end of the structure.
1883         */
1884
1885         pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1886         if (!pChksum) {
1887                 retval = ENOMEM;
1888                 goto out;
1889         }
1890
1891         p = pChksum;
1892
1893         SIVAL(p, 0, GSSAPI_BNDLENGTH);
1894         p += 4;
1895
1896         /* Zero out the bindings fields */
1897         memset(p, '\0', GSSAPI_BNDLENGTH );
1898         p += GSSAPI_BNDLENGTH;
1899
1900         SIVAL(p, 0, GSS_C_DELEG_FLAG );
1901         p += 4;
1902         SSVAL(p, 0, 1 );
1903         p += 2;
1904         SSVAL(p, 0, fwdData.length );
1905         p += 2;
1906
1907         /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1908         memcpy(p, fwdData.data, fwdData.length );
1909         p += fwdData.length;
1910
1911         /* We need to do this in order to allow our GSS-API  */
1912         retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1913         if (retval) {
1914                 goto out;
1915         }
1916
1917         /* We now have a service ticket, now turn it into an AP-REQ. */
1918         authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1919
1920         /* Caller should call free() when they're done with this. */
1921         authenticator->data = (char *)pChksum;
1922
1923   out:
1924
1925         /* Remove that input data, we never needed it anyway. */
1926         if (fwdData.length > 0) {
1927                 krb5_free_data_contents( context, &fwdData );
1928         }
1929
1930         return retval;
1931 }
1932 #endif
1933
1934 #else /* HAVE_KRB5 */
1935  /* this saves a few linking headaches */
1936  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1937                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1938                         const char *ccname, time_t *tgs_expire)
1939 {
1940          DEBUG(0,("NO KERBEROS SUPPORT\n"));
1941          return 1;
1942 }
1943
1944 #endif