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(talloc_tos(), 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(talloc_tos(), (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( 3, ("ads_krb5_get_fwd_ticket failed (%s)\n",
 753                                    error_message( retval ) ) );
 754
 755                         /*
 756                          * This is not fatal. Delete the *auth_context and continue
 757                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 758                          */
 759
 760                         if (in_data.data) {
 761                                 free( in_data.data );
 762                                 in_data.data = NULL;
 763                                 in_data.length = 0;
 764                         }
 765                         krb5_auth_con_free(context, *auth_context);
 766                         *auth_context = NULL;
 767                 }
 768         }
 769 #endif
 770
 771         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 772                                       &in_data, credsp, outbuf);
 773         if (retval) {
 774                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 775                          error_message(retval)));
 776         }
 777
 778         if (in_data.data) {
 779                 free( in_data.data );
 780                 in_data.length = 0;
 781         }
 782
 783         krb5_free_creds(context, credsp);
 784
 785 cleanup_creds:
 786         krb5_free_cred_contents(context, &creds);
 787
 788 cleanup_princ:
 789         krb5_free_principal(context, server);
 790
 791         return retval;
 792 }
 793
 794 /*
 795   get a kerberos5 ticket for the given service
 796 */
 797 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
 798                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 799                         uint32 extra_ap_opts, const char *ccname,
 800                         time_t *tgs_expire)
 801
 802 {
 803         krb5_error_code retval;
 804         krb5_data packet;
 805         krb5_context context = NULL;
 806         krb5_ccache ccdef = NULL;
 807         krb5_auth_context auth_context = NULL;
 808         krb5_enctype enc_types[] = {
 809 #ifdef ENCTYPE_ARCFOUR_HMAC
 810                 ENCTYPE_ARCFOUR_HMAC,
 811 #endif
 812                 ENCTYPE_DES_CBC_MD5,
 813                 ENCTYPE_DES_CBC_CRC,
 814                 ENCTYPE_NULL};
 815
 816         initialize_krb5_error_table();
 817         retval = krb5_init_context(&context);
 818         if (retval) {
 819                 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
 820                          error_message(retval)));
 821                 goto failed;
 822         }
 823
 824         if (time_offset != 0) {
 825                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 826         }
 827
 828         if ((retval = krb5_cc_resolve(context, ccname ?
 829                         ccname : krb5_cc_default_name(context), &ccdef))) {
 830                 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
 831                          error_message(retval)));
 832                 goto failed;
 833         }
 834
 835         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 836                 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
 837                          error_message(retval)));
 838                 goto failed;
 839         }
 840
 841         if ((retval = ads_krb5_mk_req(context,
 842                                         &auth_context,
 843                                         AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 844                                         principal,
 845                                         ccdef, &packet,
 846                                         tgs_expire))) {
 847                 goto failed;
 848         }
 849
 850         get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
 851
 852         *ticket = data_blob(packet.data, packet.length);
 853
 854         kerberos_free_data_contents(context, &packet);
 855
 856 failed:
 857
 858         if ( context ) {
 859                 if (ccdef)
 860                         krb5_cc_close(context, ccdef);
 861                 if (auth_context)
 862                         krb5_auth_con_free(context, auth_context);
 863                 krb5_free_context(context);
 864         }
 865
 866         return retval;
 867 }
 868
 869  bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
 870  {
 871         krb5_keyblock *skey;
 872         krb5_error_code err;
 873         bool ret = False;
 874
 875         if (remote)
 876                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 877         else
 878                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 879         if (err == 0 && skey != NULL) {
 880                 DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
 881                 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 882                 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 883
 884                 ret = True;
 885
 886                 krb5_free_keyblock(context, skey);
 887         } else {
 888                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 889         }
 890
 891         return ret;
 892  }
 893
 894
 895 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 896  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 897
 898  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 899 {
 900         static krb5_data kdata;
 901
 902         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 903         kdata.length = strlen((const char *)kdata.data);
 904         return &kdata;
 905 }
 906 #endif
 907
 908  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 909 {
 910 #if defined(HAVE_KRB5_KT_FREE_ENTRY)
 911         return krb5_kt_free_entry(context, kt_entry);
 912 #elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 913         return krb5_free_keytab_entry_contents(context, kt_entry);
 914 #else
 915 #error UNKNOWN_KT_FREE_FUNCTION
 916 #endif
 917 }
 918
 919  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 920                                      struct PAC_SIGNATURE_DATA *sig)
 921 {
 922 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 923         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 924         cksum->checksum.length  = sig->signature.length;
 925         cksum->checksum.data    = sig->signature.data;
 926 #else
 927         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 928         cksum->length           = sig->signature.length;
 929         cksum->contents         = sig->signature.data;
 930 #endif
 931 }
 932
 933  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 934                                           const krb5_keyblock *keyblock,
 935                                          krb5_keyusage usage,
 936                                          krb5_checksum *cksum,
 937                                          uint8 *data,
 938                                          size_t length)
 939 {
 940         krb5_error_code ret;
 941
 942         /* verify the checksum */
 943
 944         /* welcome to the wonderful world of samba's kerberos abstraction layer:
 945          *
 946          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
 947          * -----------------------------------------------------------------------------
 948          * krb5_c_verify_checksum       -                       works           works
 949          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
 950          */
 951
 952 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
 953         {
 954                 krb5_boolean checksum_valid = False;
 955                 krb5_data input;
 956
 957                 input.data = (char *)data;
 958                 input.length = length;
 959
 960                 ret = krb5_c_verify_checksum(context,
 961                                              keyblock,
 962                                              usage,
 963                                              &input,
 964                                              cksum,
 965                                              &checksum_valid);
 966                 if (ret) {
 967                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
 968                                 error_message(ret)));
 969                         return ret;
 970                 }
 971
 972                 if (!checksum_valid)
 973                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
 974         }
 975
 976 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
 977
 978         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
 979          * without enctype and it ignores any key_usage types - Guenther */
 980
 981         {
 982
 983                 krb5_crypto crypto;
 984                 ret = krb5_crypto_init(context,
 985                                        keyblock,
 986                                        0,
 987                                        &crypto);
 988                 if (ret) {
 989                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
 990                                 error_message(ret)));
 991                         return ret;
 992                 }
 993
 994                 ret = krb5_verify_checksum(context,
 995                                            crypto,
 996                                            usage,
 997                                            data,
 998                                            length,
 999                                            cksum);
1000
1001                 krb5_crypto_destroy(context, crypto);
1002         }
1003
1004 #else
1005 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1006 #endif
1007
1008         return ret;
1009 }
1010
1011  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1012 {
1013 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1014         return tkt->enc_part2->times.authtime;
1015 #else
1016         return tkt->ticket.authtime;
1017 #endif
1018 }
1019
1020 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1021 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1022 {
1023 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1024         if (ap_req->ticket->enc_part.kvno)
1025                 return ap_req->ticket->enc_part.kvno;
1026 #else /* Heimdal */
1027         if (ap_req->ticket.enc_part.kvno)
1028                 return *ap_req->ticket.enc_part.kvno;
1029 #endif
1030         return 0;
1031 }
1032
1033 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1034 {
1035 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1036         return ap_req->ticket.enc_part.etype;
1037 #else /* MIT */
1038         return ap_req->ticket->enc_part.enctype;
1039 #endif
1040 }
1041 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1042
1043 static krb5_error_code
1044 get_key_from_keytab(krb5_context context,
1045                     krb5_const_principal server,
1046                     krb5_enctype enctype,
1047                     krb5_kvno kvno,
1048                     krb5_keyblock **out_key)
1049 {
1050         krb5_keytab_entry entry;
1051         krb5_error_code ret;
1052         krb5_keytab keytab;
1053         char *name = NULL;
1054         krb5_keyblock *keyp;
1055
1056         /* We have to open a new keytab handle here, as MIT does
1057            an implicit open/getnext/close on krb5_kt_get_entry. We
1058            may be in the middle of a keytab enumeration when this is
1059            called. JRA. */
1060
1061         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1062         if (ret) {
1063                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1064                 return ret;
1065         }
1066
1067         if ( DEBUGLEVEL >= 10 ) {
1068                 if (smb_krb5_unparse_name(context, server, &name) == 0) {
1069                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1070                                 kvno, enctype, name));
1071                         SAFE_FREE(name);
1072                 }
1073         }
1074
1075         ret = krb5_kt_get_entry(context,
1076                                 keytab,
1077                                 server,
1078                                 kvno,
1079                                 enctype,
1080                                 &entry);
1081
1082         if (ret) {
1083                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1084                 goto out;
1085         }
1086
1087         keyp = KRB5_KT_KEY(&entry);
1088
1089         ret = krb5_copy_keyblock(context, keyp, out_key);
1090         if (ret) {
1091                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1092                 goto out;
1093         }
1094
1095         smb_krb5_kt_free_entry(context, &entry);
1096
1097 out:
1098         krb5_kt_close(context, keytab);
1099         return ret;
1100 }
1101
1102 /* Prototypes */
1103
1104  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1105                                                  const krb5_data *inbuf,
1106                                                  krb5_kvno *kvno,
1107                                                  krb5_enctype *enctype)
1108 {
1109 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1110         {
1111                 krb5_error_code ret;
1112                 krb5_ap_req ap_req;
1113
1114                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1115                 if (ret)
1116                         return ret;
1117
1118                 *kvno = get_kvno_from_ap_req(&ap_req);
1119                 *enctype = get_enctype_from_ap_req(&ap_req);
1120
1121                 free_AP_REQ(&ap_req);
1122                 return 0;
1123         }
1124 #endif
1125
1126         /* Possibly not an appropriate error code. */
1127         return KRB5KDC_ERR_BADOPTION;
1128 }
1129
1130  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1131                                                         krb5_auth_context *auth_context,
1132                                                         const krb5_data *inbuf,
1133                                                         krb5_const_principal server,
1134                                                         krb5_keytab keytab,
1135                                                         krb5_flags *ap_req_options,
1136                                                         krb5_ticket **ticket,
1137                                                         krb5_keyblock **keyblock)
1138 {
1139         krb5_error_code ret;
1140         krb5_kvno kvno;
1141         krb5_enctype enctype;
1142         krb5_keyblock *local_keyblock;
1143
1144         ret = krb5_rd_req(context,
1145                           auth_context,
1146                           inbuf,
1147                           server,
1148                           keytab,
1149                           ap_req_options,
1150                           ticket);
1151         if (ret) {
1152                 return ret;
1153         }
1154
1155 #ifdef KRB5_TICKET_HAS_KEYINFO
1156         enctype = (*ticket)->enc_part.enctype;
1157         kvno = (*ticket)->enc_part.kvno;
1158 #else
1159         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1160         if (ret) {
1161                 return ret;
1162         }
1163 #endif
1164
1165         ret = get_key_from_keytab(context,
1166                                   server,
1167                                   enctype,
1168                                   kvno,
1169                                   &local_keyblock);
1170         if (ret) {
1171                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1172                 goto out;
1173         }
1174
1175 out:
1176         if (ret && local_keyblock != NULL) {
1177                 krb5_free_keyblock(context, local_keyblock);
1178         } else {
1179                 *keyblock = local_keyblock;
1180         }
1181
1182         return ret;
1183 }
1184
1185  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1186                                             const char *name,
1187                                             krb5_principal *principal)
1188 {
1189 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1190         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1191 #endif
1192
1193         /* we are cheating here because parse_name will in fact set the realm.
1194          * We don't care as the only caller of smb_krb5_parse_name_norealm
1195          * ignores the realm anyway when calling
1196          * smb_krb5_principal_compare_any_realm later - Guenther */
1197
1198         return smb_krb5_parse_name(context, name, principal);
1199 }
1200
1201  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1202                                           krb5_const_principal princ1,
1203                                           krb5_const_principal princ2)
1204 {
1205 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1206
1207         return krb5_principal_compare_any_realm(context, princ1, princ2);
1208
1209 /* krb5_princ_size is a macro in MIT */
1210 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1211
1212         int i, len1, len2;
1213         const krb5_data *p1, *p2;
1214
1215         len1 = krb5_princ_size(context, princ1);
1216         len2 = krb5_princ_size(context, princ2);
1217
1218         if (len1 != len2)
1219                 return False;
1220
1221         for (i = 0; i < len1; i++) {
1222
1223                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1224                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1225
1226                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1227                         return False;
1228         }
1229
1230         return True;
1231 #else
1232 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1233 #endif
1234 }
1235
1236  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1237                                        const char *client_string,       /* gd@BER.SUSE.DE */
1238                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1239                                        time_t *expire_time)
1240 {
1241         krb5_error_code ret;
1242         krb5_context context = NULL;
1243         krb5_ccache ccache = NULL;
1244         krb5_principal client = NULL;
1245         krb5_creds creds, creds_in, *creds_out = NULL;
1246
1247         ZERO_STRUCT(creds);
1248         ZERO_STRUCT(creds_in);
1249
1250         initialize_krb5_error_table();
1251         ret = krb5_init_context(&context);
1252         if (ret) {
1253                 goto done;
1254         }
1255
1256         if (!ccache_string) {
1257                 ccache_string = krb5_cc_default_name(context);
1258         }
1259
1260         if (!ccache_string) {
1261                 ret = EINVAL;
1262                 goto done;
1263         }
1264
1265         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1266
1267         /* FIXME: we should not fall back to defaults */
1268         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1269         if (ret) {
1270                 goto done;
1271         }
1272
1273         if (client_string) {
1274                 ret = smb_krb5_parse_name(context, client_string, &client);
1275                 if (ret) {
1276                         goto done;
1277                 }
1278         } else {
1279                 ret = krb5_cc_get_principal(context, ccache, &client);
1280                 if (ret) {
1281                         goto done;
1282                 }
1283         }
1284
1285 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1286         {
1287                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1288                 if (ret) {
1289                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1290                         goto done;
1291                 }
1292         }
1293 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1294         {
1295                 krb5_kdc_flags flags;
1296                 krb5_realm *client_realm = NULL;
1297
1298                 ret = krb5_copy_principal(context, client, &creds_in.client);
1299                 if (ret) {
1300                         goto done;
1301                 }
1302
1303                 if (service_string) {
1304                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1305                         if (ret) {
1306                                 goto done;
1307                         }
1308                 } else {
1309                         /* build tgt service by default */
1310                         client_realm = krb5_princ_realm(context, creds_in.client);
1311                         if (!client_realm) {
1312                                 ret = ENOMEM;
1313                                 goto done;
1314                         }
1315                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1316                         if (ret) {
1317                                 goto done;
1318                         }
1319                 }
1320
1321                 flags.i = 0;
1322                 flags.b.renewable = flags.b.renew = True;
1323
1324                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1325                 if (ret) {
1326                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1327                         goto done;
1328                 }
1329
1330                 creds = *creds_out;
1331         }
1332 #else
1333 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1334 #endif
1335
1336         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1337         ret = krb5_cc_initialize(context, ccache, client);
1338         if (ret) {
1339                 goto done;
1340         }
1341
1342         ret = krb5_cc_store_cred(context, ccache, &creds);
1343
1344         if (expire_time) {
1345                 *expire_time = (time_t) creds.times.endtime;
1346         }
1347
1348 done:
1349         krb5_free_cred_contents(context, &creds_in);
1350
1351         if (creds_out) {
1352                 krb5_free_creds(context, creds_out);
1353         } else {
1354                 krb5_free_cred_contents(context, &creds);
1355         }
1356
1357         if (client) {
1358                 krb5_free_principal(context, client);
1359         }
1360         if (ccache) {
1361                 krb5_cc_close(context, ccache);
1362         }
1363         if (context) {
1364                 krb5_free_context(context);
1365         }
1366
1367         return ret;
1368 }
1369
1370  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1371 {
1372         krb5_error_code ret = 0;
1373         if (addr == NULL) {
1374                 return ret;
1375         }
1376 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1377         krb5_free_addresses(context, addr->addrs);
1378 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1379         ret = krb5_free_addresses(context, addr->addrs);
1380         SAFE_FREE(addr->addrs);
1381 #endif
1382         SAFE_FREE(addr);
1383         addr = NULL;
1384         return ret;
1385 }
1386
1387  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1388 {
1389         krb5_error_code ret = 0;
1390         nstring buf;
1391 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1392         krb5_address **addrs = NULL;
1393 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1394         krb5_addresses *addrs = NULL;
1395 #endif
1396
1397         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1398         if (*kerb_addr == NULL) {
1399                 return ENOMEM;
1400         }
1401
1402         put_name(buf, global_myname(), ' ', 0x20);
1403
1404 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1405         {
1406                 int num_addr = 2;
1407
1408                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1409                 if (addrs == NULL) {
1410                         SAFE_FREE(kerb_addr);
1411                         return ENOMEM;
1412                 }
1413
1414                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1415
1416                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1417                 if (addrs[0] == NULL) {
1418                         SAFE_FREE(addrs);
1419                         SAFE_FREE(kerb_addr);
1420                         return ENOMEM;
1421                 }
1422
1423                 addrs[0]->magic = KV5M_ADDRESS;
1424                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1425                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1426                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1427                 if (addrs[0]->contents == NULL) {
1428                         SAFE_FREE(addrs[0]);
1429                         SAFE_FREE(addrs);
1430                         SAFE_FREE(kerb_addr);
1431                         return ENOMEM;
1432                 }
1433
1434                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1435
1436                 addrs[1] = NULL;
1437         }
1438 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1439         {
1440                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1441                 if (addrs == NULL) {
1442                         SAFE_FREE(kerb_addr);
1443                         return ENOMEM;
1444                 }
1445
1446                 memset(addrs, 0, sizeof(krb5_addresses));
1447
1448                 addrs->len = 1;
1449                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1450                 if (addrs->val == NULL) {
1451                         SAFE_FREE(addrs);
1452                         SAFE_FREE(kerb_addr);
1453                         return ENOMEM;
1454                 }
1455
1456                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1457                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1458                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1459                 if (addrs->val[0].address.data == NULL) {
1460                         SAFE_FREE(addrs->val);
1461                         SAFE_FREE(addrs);
1462                         SAFE_FREE(kerb_addr);
1463                         return ENOMEM;
1464                 }
1465
1466                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1467         }
1468 #else
1469 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1470 #endif
1471         (*kerb_addr)->addrs = addrs;
1472
1473         return ret;
1474 }
1475
1476  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1477 {
1478 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1479         krb5_free_error_contents(context, krberror);
1480 #else /* MIT */
1481         krb5_free_error(context, krberror);
1482 #endif
1483 }
1484
1485  krb5_error_code handle_krberror_packet(krb5_context context,
1486                                         krb5_data *packet)
1487 {
1488         krb5_error_code ret;
1489         bool got_error_code = False;
1490
1491         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1492
1493 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1494         {
1495                 krb5_error krberror;
1496
1497                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1498                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1499                                 error_message(ret)));
1500                         return ret;
1501                 }
1502
1503                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1504                         ret = (krb5_error_code) krberror.error_code;
1505                         got_error_code = True;
1506                 }
1507
1508                 smb_krb5_free_error(context, &krberror);
1509         }
1510 #else /* MIT */
1511         {
1512                 krb5_error *krberror;
1513
1514                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1515                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1516                                 error_message(ret)));
1517                         return ret;
1518                 }
1519
1520                 if (krberror->e_data.data == NULL) {
1521                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1522                         got_error_code = True;
1523                 }
1524                 smb_krb5_free_error(context, krberror);
1525         }
1526 #endif
1527         if (got_error_code) {
1528                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1529                         error_message(ret), ret));
1530         }
1531         return ret;
1532 }
1533
1534  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1535                                             krb5_get_init_creds_opt **opt)
1536 {
1537 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1538         /* Heimdal or modern MIT version */
1539         return krb5_get_init_creds_opt_alloc(context, opt);
1540 #else
1541         /* Historical MIT version */
1542         krb5_get_init_creds_opt *my_opt;
1543
1544         *opt = NULL;
1545
1546         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1547                 return ENOMEM;
1548         }
1549
1550         krb5_get_init_creds_opt_init(my_opt);
1551
1552         *opt =  my_opt;
1553         return 0;
1554 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1555 }
1556
1557  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1558                                 krb5_get_init_creds_opt *opt)
1559 {
1560 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1561
1562 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1563         /* Modern MIT or Heimdal version */
1564         krb5_get_init_creds_opt_free(context, opt);
1565 #else
1566         /* Heimdal version */
1567         krb5_get_init_creds_opt_free(opt);
1568 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1569
1570 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1571         /* Historical MIT version */
1572         SAFE_FREE(opt);
1573         opt = NULL;
1574 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1575 }
1576
1577  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1578 {
1579         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1580 }
1581
1582
1583 /* caller needs to free etype_s */
1584  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1585                                             krb5_enctype enctype,
1586                                             char **etype_s)
1587 {
1588 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1589         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1590 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1591         char buf[256];
1592         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1593         if (ret) {
1594                 return ret;
1595         }
1596         *etype_s = SMB_STRDUP(buf);
1597         if (!*etype_s) {
1598                 return ENOMEM;
1599         }
1600         return ret;
1601 #else
1602 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1603 #endif
1604 }
1605
1606  krb5_error_code smb_krb5_mk_error(krb5_context context,
1607                                 krb5_error_code error_code,
1608                                 const krb5_principal server,
1609                                 krb5_data *reply)
1610 {
1611 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1612         /*
1613          * The MIT interface is *terrible*.
1614          * We have to construct this ourselves...
1615          */
1616         krb5_error e;
1617
1618         memset(&e, 0, sizeof(e));
1619         krb5_us_timeofday(context, &e.stime, &e.susec);
1620         e.server = server;
1621 #if defined(krb5_err_base)
1622         e.error = error_code - krb5_err_base;
1623 #elif defined(ERROR_TABLE_BASE_krb5)
1624         e.error = error_code - ERROR_TABLE_BASE_krb5;
1625 #else
1626         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1627 #endif
1628
1629         return krb5_mk_error(context, &e, reply);
1630 #else /* Heimdal. */
1631         return krb5_mk_error(context,
1632                                 error_code,
1633                                 NULL,
1634                                 NULL, /* e_data */
1635                                 NULL,
1636                                 server,
1637                                 NULL,
1638                                 NULL,
1639                                 reply);
1640 #endif
1641 }
1642
1643 /**********************************************************************
1644  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1645  * allows to process non-default keytab names.
1646  * @param context krb5_context
1647  * @param keytab_name_req string
1648  * @param write_access bool if writable keytab is required
1649  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1650  * @return krb5_error_code
1651 **********************************************************************/
1652
1653 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1654 #ifndef MAX_KEYTAB_NAME_LEN
1655 #define MAX_KEYTAB_NAME_LEN 1100
1656 #endif
1657
1658  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1659                                       const char *keytab_name_req,
1660                                       bool write_access,
1661                                       krb5_keytab *keytab)
1662 {
1663         krb5_error_code ret = 0;
1664         TALLOC_CTX *mem_ctx;
1665         char keytab_string[MAX_KEYTAB_NAME_LEN];
1666         char *kt_str = NULL;
1667         bool found_valid_name = False;
1668         const char *pragma = "FILE";
1669         const char *tmp = NULL;
1670
1671         if (!write_access && !keytab_name_req) {
1672                 /* caller just wants to read the default keytab readonly, so be it */
1673                 return krb5_kt_default(context, keytab);
1674         }
1675
1676         mem_ctx = talloc_init("smb_krb5_open_keytab");
1677         if (!mem_ctx) {
1678                 return ENOMEM;
1679         }
1680
1681 #ifdef HAVE_WRFILE_KEYTAB
1682         if (write_access) {
1683                 pragma = "WRFILE";
1684         }
1685 #endif
1686
1687         if (keytab_name_req) {
1688
1689                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1690                         ret = KRB5_CONFIG_NOTENUFSPACE;
1691                         goto out;
1692                 }
1693
1694                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1695                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1696                         tmp = keytab_name_req;
1697                         goto resolve;
1698                 }
1699
1700                 if (keytab_name_req[0] != '/') {
1701                         ret = KRB5_KT_BADNAME;
1702                         goto out;
1703                 }
1704
1705                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1706                 if (!tmp) {
1707                         ret = ENOMEM;
1708                         goto out;
1709                 }
1710
1711                 goto resolve;
1712         }
1713
1714         /* we need to handle more complex keytab_strings, like:
1715          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1716
1717         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1718         if (ret) {
1719                 goto out;
1720         }
1721
1722         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1723
1724         tmp = talloc_strdup(mem_ctx, keytab_string);
1725         if (!tmp) {
1726                 ret = ENOMEM;
1727                 goto out;
1728         }
1729
1730         if (strncmp(tmp, "ANY:", 4) == 0) {
1731                 tmp += 4;
1732         }
1733
1734         memset(&keytab_string, '\0', sizeof(keytab_string));
1735
1736         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1737                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1738                         found_valid_name = True;
1739                         tmp = kt_str;
1740                         tmp += 7;
1741                 }
1742
1743                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1744                         found_valid_name = True;
1745                         tmp = kt_str;
1746                         tmp += 5;
1747                 }
1748
1749                 if (found_valid_name) {
1750                         if (tmp[0] != '/') {
1751                                 ret = KRB5_KT_BADNAME;
1752                                 goto out;
1753                         }
1754
1755                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1756                         if (!tmp) {
1757                                 ret = ENOMEM;
1758                                 goto out;
1759                         }
1760                         break;
1761                 }
1762         }
1763
1764         if (!found_valid_name) {
1765                 ret = KRB5_KT_UNKNOWN_TYPE;
1766                 goto out;
1767         }
1768
1769  resolve:
1770         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1771         ret = krb5_kt_resolve(context, tmp, keytab);
1772
1773  out:
1774         TALLOC_FREE(mem_ctx);
1775         return ret;
1776 }
1777
1778 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1779                                      krb5_context context,
1780                                      krb5_keytab keytab,
1781                                      const char **keytab_name)
1782 {
1783         char keytab_string[MAX_KEYTAB_NAME_LEN];
1784         krb5_error_code ret = 0;
1785
1786         ret = krb5_kt_get_name(context, keytab,
1787                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1788         if (ret) {
1789                 return ret;
1790         }
1791
1792         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1793         if (!*keytab_name) {
1794                 return ENOMEM;
1795         }
1796
1797         return ret;
1798 }
1799
1800 #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)
1801 /**************************************************************
1802 Routine: ads_krb5_get_fwd_ticket
1803  Description:
1804     When a service ticket is flagged as trusted
1805     for delegation we should provide a forwardable
1806     ticket so that the remote host can act on our
1807     behalf.  This is done by taking the 2nd forwardable
1808     TGT and storing it in the GSS-API authenticator
1809     "checksum".  This routine will populate
1810     the krb5_data authenticator with this TGT.
1811  Parameters:
1812     krb5_context context: The kerberos context for this authentication.
1813     krb5_auth_context:    The authentication context.
1814     krb5_creds *credsp:   The ticket credentials (AS-REP).
1815     krb5_ccache ccache:   The credentials cache.
1816     krb5_data &authenticator: The checksum field that will store the TGT, and
1817      authenticator.data must be freed by the caller.
1818
1819  Returns:
1820     krb5_error_code: 0 if no errors, otherwise set.
1821 **************************************************************/
1822
1823 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1824                                          krb5_auth_context *auth_context,
1825                                          krb5_creds *credsp,
1826                                          krb5_ccache ccache,
1827                                          krb5_data *authenticator)
1828 {
1829         krb5_data fwdData;
1830         krb5_error_code retval = 0;
1831         char *pChksum = NULL;
1832         char *p = NULL;
1833
1834         ZERO_STRUCT(fwdData);
1835         ZERO_STRUCTP(authenticator);
1836
1837         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1838                                 *auth_context,  /* Authentication context [in] */
1839                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
1840                                 credsp->client, /* Client principal for the tgt [in] */
1841                                 credsp->server, /* Server principal for the tgt [in] */
1842                                 ccache,         /* Credential cache to use for storage [in] */
1843                                 1,              /* Turn on for "Forwardable ticket" [in] */
1844                                 &fwdData );     /* Resulting response [out] */
1845
1846
1847         if (retval) {
1848                 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1849                         error_message(retval)));
1850                 goto out;
1851         }
1852
1853         if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1854                 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1855                 retval = EINVAL;
1856                 goto out;
1857         }
1858
1859         /* We're going to allocate a gssChecksum structure with a little
1860            extra data the length of the kerberos credentials length
1861            (APPLICATION 22) so that we can pack it on the end of the structure.
1862         */
1863
1864         pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1865         if (!pChksum) {
1866                 retval = ENOMEM;
1867                 goto out;
1868         }
1869
1870         p = pChksum;
1871
1872         SIVAL(p, 0, GSSAPI_BNDLENGTH);
1873         p += 4;
1874
1875         /* Zero out the bindings fields */
1876         memset(p, '\0', GSSAPI_BNDLENGTH );
1877         p += GSSAPI_BNDLENGTH;
1878
1879         SIVAL(p, 0, GSS_C_DELEG_FLAG );
1880         p += 4;
1881         SSVAL(p, 0, 1 );
1882         p += 2;
1883         SSVAL(p, 0, fwdData.length );
1884         p += 2;
1885
1886         /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1887         memcpy(p, fwdData.data, fwdData.length );
1888         p += fwdData.length;
1889
1890         /* We need to do this in order to allow our GSS-API  */
1891         retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1892         if (retval) {
1893                 goto out;
1894         }
1895
1896         /* We now have a service ticket, now turn it into an AP-REQ. */
1897         authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1898
1899         /* Caller should call free() when they're done with this. */
1900         authenticator->data = (char *)pChksum;
1901
1902   out:
1903
1904         /* Remove that input data, we never needed it anyway. */
1905         if (fwdData.length > 0) {
1906                 krb5_free_data_contents( context, &fwdData );
1907         }
1908
1909         return retval;
1910 }
1911 #endif
1912
1913 #else /* HAVE_KRB5 */
1914  /* this saves a few linking headaches */
1915  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1916                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1917                         const char *ccname, time_t *tgs_expire)
1918 {
1919          DEBUG(0,("NO KERBEROS SUPPORT\n"));
1920          return 1;
1921 }
1922
1923 #endif