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