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_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  60                 return ENOMEM;
  61         }
  62
  63         ret = krb5_parse_name(context, utf8_name, principal);
  64         TALLOC_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_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  83                 return ENOMEM;
  84         }
  85
  86         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  87         TALLOC_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 talloc_free() call.
  95 **************************************************************/
  96
  97 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
  98                                       krb5_context context,
  99                                       krb5_const_principal principal,
 100                                       char **unix_name)
 101 {
 102         krb5_error_code ret;
 103         char *utf8_name;
 104         size_t converted_size;
 105
 106         *unix_name = NULL;
 107         ret = krb5_unparse_name(context, principal, &utf8_name);
 108         if (ret) {
 109                 return ret;
 110         }
 111
 112         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 113                 krb5_free_unparsed_name(context, utf8_name);
 114                 return ENOMEM;
 115         }
 116         krb5_free_unparsed_name(context, utf8_name);
 117         return 0;
 118 }
 119
 120 #ifndef HAVE_KRB5_SET_REAL_TIME
 121 /*
 122  * This function is not in the Heimdal mainline.
 123  */
 124  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 125 {
 126         krb5_error_code ret;
 127         int32_t sec, usec;
 128
 129         ret = krb5_us_timeofday(context, &sec, &usec);
 130         if (ret)
 131                 return ret;
 132
 133         context->kdc_sec_offset = seconds - sec;
 134         context->kdc_usec_offset = microseconds - usec;
 135
 136         return 0;
 137 }
 138 #endif
 139
 140 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 141
 142 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 143
 144 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 145  * to krb5_set_default_tgs_ktypes. See
 146  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 147  *
 148  * If the MIT libraries are not exporting internal symbols, we will end up in
 149  * this branch, which is correct. Otherwise we will continue to use the
 150  * internal symbol
 151  */
 152  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 153 {
 154     return krb5_set_default_tgs_enctypes(ctx, enc);
 155 }
 156
 157 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 158
 159 /* Heimdal */
 160  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 161 {
 162         return krb5_set_default_in_tkt_etypes(ctx, enc);
 163 }
 164
 165 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 166
 167 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 168
 169 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 170 /* HEIMDAL */
 171  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 172 {
 173         memset(pkaddr, '\0', sizeof(krb5_address));
 174 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 175         if (paddr->ss_family == AF_INET6) {
 176                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 177                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 178                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 179                 return true;
 180         }
 181 #endif
 182         if (paddr->ss_family == AF_INET) {
 183                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 184                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 185                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 186                 return true;
 187         }
 188         return false;
 189 }
 190 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 191 /* MIT */
 192  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 193 {
 194         memset(pkaddr, '\0', sizeof(krb5_address));
 195 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 196         if (paddr->ss_family == AF_INET6) {
 197                 pkaddr->addrtype = ADDRTYPE_INET6;
 198                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 199                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 200                 return true;
 201         }
 202 #endif
 203         if (paddr->ss_family == AF_INET) {
 204                 pkaddr->addrtype = ADDRTYPE_INET;
 205                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 206                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 207                 return true;
 208         }
 209         return false;
 210 }
 211 #else
 212 #error UNKNOWN_ADDRTYPE
 213 #endif
 214
 215 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 216 static int create_kerberos_key_from_string_direct(krb5_context context,
 217                                                   krb5_principal host_princ,
 218                                                   krb5_data *password,
 219                                                   krb5_keyblock *key,
 220                                                   krb5_enctype enctype)
 221 {
 222         int ret = 0;
 223         krb5_data salt;
 224         krb5_encrypt_block eblock;
 225
 226         ret = krb5_principal2salt(context, host_princ, &salt);
 227         if (ret) {
 228                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 229                 return ret;
 230         }
 231         krb5_use_enctype(context, &eblock, enctype);
 232         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 233         SAFE_FREE(salt.data);
 234
 235         return ret;
 236 }
 237 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 238 static int create_kerberos_key_from_string_direct(krb5_context context,
 239                                                   krb5_principal host_princ,
 240                                                   krb5_data *password,
 241                                                   krb5_keyblock *key,
 242                                                   krb5_enctype enctype)
 243 {
 244         int ret;
 245         krb5_salt salt;
 246
 247         ret = krb5_get_pw_salt(context, host_princ, &salt);
 248         if (ret) {
 249                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 250                 return ret;
 251         }
 252
 253         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 254         krb5_free_salt(context, salt);
 255
 256         return ret;
 257 }
 258 #else
 259 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 260 #endif
 261
 262  int create_kerberos_key_from_string(krb5_context context,
 263                                         krb5_principal host_princ,
 264                                         krb5_data *password,
 265                                         krb5_keyblock *key,
 266                                         krb5_enctype enctype,
 267                                         bool no_salt)
 268 {
 269         krb5_principal salt_princ = NULL;
 270         int ret;
 271         /*
 272          * Check if we've determined that the KDC is salting keys for this
 273          * principal/enctype in a non-obvious way.  If it is, try to match
 274          * its behavior.
 275          */
 276         if (no_salt) {
 277                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 278                 if (!KRB5_KEY_DATA(key)) {
 279                         return ENOMEM;
 280                 }
 281                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 282                 KRB5_KEY_LENGTH(key) = password->length;
 283                 KRB5_KEY_TYPE(key) = enctype;
 284                 return 0;
 285         }
 286         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 287         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 288         if (salt_princ) {
 289                 krb5_free_principal(context, salt_princ);
 290         }
 291         return ret;
 292 }
 293
 294 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 295  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 296                                             krb5_enctype **enctypes)
 297 {
 298         return krb5_get_permitted_enctypes(context, enctypes);
 299 }
 300 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 301  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 302                                             krb5_enctype **enctypes)
 303 {
 304         return krb5_get_default_in_tkt_etypes(context, enctypes);
 305 }
 306 #else
 307 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 308 #endif
 309
 310 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 311  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 312                                         krb5_auth_context auth_context,
 313                                         krb5_keyblock *keyblock)
 314 {
 315         return krb5_auth_con_setkey(context, auth_context, keyblock);
 316 }
 317 #endif
 318
 319 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 320                            DATA_BLOB *edata,
 321                            DATA_BLOB *edata_out)
 322 {
 323         DATA_BLOB edata_contents;
 324         ASN1_DATA *data;
 325         int edata_type;
 326
 327         if (!edata->length) {
 328                 return False;
 329         }
 330
 331         data = asn1_init(mem_ctx);
 332         if (data == NULL) {
 333                 return false;
 334         }
 335
 336         asn1_load(data, *edata);
 337         asn1_start_tag(data, ASN1_SEQUENCE(0));
 338         asn1_start_tag(data, ASN1_CONTEXT(1));
 339         asn1_read_Integer(data, &edata_type);
 340
 341         if (edata_type != KRB5_PADATA_PW_SALT) {
 342                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 343                         KRB5_PADATA_PW_SALT, edata_type));
 344                 asn1_free(data);
 345                 return False;
 346         }
 347
 348         asn1_start_tag(data, ASN1_CONTEXT(2));
 349         asn1_read_OctetString(data, talloc_autofree_context(), &edata_contents);
 350         asn1_end_tag(data);
 351         asn1_end_tag(data);
 352         asn1_end_tag(data);
 353         asn1_free(data);
 354
 355         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 356
 357         data_blob_free(&edata_contents);
 358
 359         return True;
 360 }
 361
 362
 363 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 364 {
 365         DATA_BLOB pac_contents;
 366         ASN1_DATA *data;
 367         int data_type;
 368
 369         if (!auth_data->length) {
 370                 return False;
 371         }
 372
 373         data = asn1_init(mem_ctx);
 374         if (data == NULL) {
 375                 return false;
 376         }
 377
 378         asn1_load(data, *auth_data);
 379         asn1_start_tag(data, ASN1_SEQUENCE(0));
 380         asn1_start_tag(data, ASN1_SEQUENCE(0));
 381         asn1_start_tag(data, ASN1_CONTEXT(0));
 382         asn1_read_Integer(data, &data_type);
 383
 384         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 385                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 386                 asn1_free(data);
 387                 return False;
 388         }
 389
 390         asn1_end_tag(data);
 391         asn1_start_tag(data, ASN1_CONTEXT(1));
 392         asn1_read_OctetString(data, talloc_autofree_context(), &pac_contents);
 393         asn1_end_tag(data);
 394         asn1_end_tag(data);
 395         asn1_end_tag(data);
 396         asn1_free(data);
 397
 398         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 399
 400         data_blob_free(&pac_contents);
 401
 402         return True;
 403 }
 404
 405  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 406 {
 407         DATA_BLOB auth_data_wrapped;
 408         bool got_auth_data_pac = False;
 409         int i;
 410
 411 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 412         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 413             tkt->enc_part2->authorization_data[0] &&
 414             tkt->enc_part2->authorization_data[0]->length)
 415         {
 416                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 417
 418                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 419                             KRB5_AUTHDATA_IF_RELEVANT) {
 420                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 421                                         tkt->enc_part2->authorization_data[i]->ad_type));
 422                                 continue;
 423                         }
 424
 425                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 426                                                       tkt->enc_part2->authorization_data[i]->length);
 427
 428                         /* check if it is a PAC */
 429                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 430                         data_blob_free(&auth_data_wrapped);
 431
 432                         if (got_auth_data_pac) {
 433                                 return true;
 434                         }
 435                 }
 436
 437                 return got_auth_data_pac;
 438         }
 439
 440 #else
 441         if (tkt->ticket.authorization_data &&
 442             tkt->ticket.authorization_data->len)
 443         {
 444                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 445
 446                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 447                             KRB5_AUTHDATA_IF_RELEVANT) {
 448                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 449                                         tkt->ticket.authorization_data->val[i].ad_type));
 450                                 continue;
 451                         }
 452
 453                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 454                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 455
 456                         /* check if it is a PAC */
 457                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 458                         data_blob_free(&auth_data_wrapped);
 459
 460                         if (got_auth_data_pac) {
 461                                 return true;
 462                         }
 463                 }
 464
 465                 return got_auth_data_pac;
 466         }
 467 #endif
 468         return False;
 469 }
 470
 471  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 472 {
 473 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 474         return tkt->enc_part2->client;
 475 #else
 476         return tkt->client;
 477 #endif
 478 }
 479
 480 #if !defined(HAVE_KRB5_LOCATE_KDC)
 481
 482 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 483  * to a public interface for this functionality, so we have to be able to live
 484  * without it if the MIT libraries are hiding their internal symbols.
 485  */
 486
 487 #if defined(KRB5_KRBHST_INIT)
 488 /* Heimdal */
 489  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 490 {
 491         krb5_krbhst_handle hnd;
 492         krb5_krbhst_info *hinfo;
 493         krb5_error_code rc;
 494         int num_kdcs, i;
 495         struct sockaddr *sa;
 496         struct addrinfo *ai;
 497
 498         *addr_pp = NULL;
 499         *naddrs = 0;
 500
 501         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 502         if (rc) {
 503                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 504                 return rc;
 505         }
 506
 507         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 508                 ;
 509
 510         krb5_krbhst_reset(ctx, hnd);
 511
 512         if (!num_kdcs) {
 513                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 514                 krb5_krbhst_free(ctx, hnd);
 515                 return -1;
 516         }
 517
 518         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 519         if (!sa) {
 520                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 521                 krb5_krbhst_free(ctx, hnd);
 522                 naddrs = 0;
 523                 return -1;
 524         }
 525
 526         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 527
 528         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 529
 530 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 531                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 532                 if (rc) {
 533                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 534                         continue;
 535                 }
 536 #endif
 537                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 538                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 539         }
 540
 541         krb5_krbhst_free(ctx, hnd);
 542
 543         *naddrs = num_kdcs;
 544         *addr_pp = sa;
 545         return 0;
 546 }
 547
 548 #else /* ! defined(KRB5_KRBHST_INIT) */
 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         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 554         return KRB5_KDC_UNREACH;
 555 }
 556
 557 #endif /* KRB5_KRBHST_INIT */
 558
 559 #else /* ! HAVE_KRB5_LOCATE_KDC */
 560
 561  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 562                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 563 {
 564         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 565 }
 566
 567 #endif /* HAVE_KRB5_LOCATE_KDC */
 568
 569 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 570  void krb5_free_unparsed_name(krb5_context context, char *val)
 571 {
 572         SAFE_FREE(val);
 573 }
 574 #endif
 575
 576  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 577 {
 578 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 579         if (pdata->data) {
 580                 krb5_free_data_contents(context, pdata);
 581         }
 582 #else
 583         SAFE_FREE(pdata->data);
 584 #endif
 585 }
 586
 587  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 588 {
 589 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 590         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 591 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 592         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 593 #else
 594 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 595 #endif
 596 }
 597
 598  bool kerberos_compatible_enctypes(krb5_context context,
 599                                   krb5_enctype enctype1,
 600                                   krb5_enctype enctype2)
 601 {
 602 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 603         krb5_boolean similar = 0;
 604
 605         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 606         return similar ? True : False;
 607 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 608         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 609 #endif
 610 }
 611
 612 static bool ads_cleanup_expired_creds(krb5_context context,
 613                                       krb5_ccache  ccache,
 614                                       krb5_creds  *credsp)
 615 {
 616         krb5_error_code retval;
 617         const char *cc_type = krb5_cc_get_type(context, ccache);
 618
 619         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 620                   cc_type, krb5_cc_get_name(context, ccache),
 621                   http_timestring(talloc_tos(), credsp->times.endtime)));
 622
 623         /* we will probably need new tickets if the current ones
 624            will expire within 10 seconds.
 625         */
 626         if (credsp->times.endtime >= (time(NULL) + 10))
 627                 return False;
 628
 629         /* heimdal won't remove creds from a file ccache, and
 630            perhaps we shouldn't anyway, since internally we
 631            use memory ccaches, and a FILE one probably means that
 632            we're using creds obtained outside of our exectuable
 633         */
 634         if (strequal(cc_type, "FILE")) {
 635                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 636                 return False;
 637         }
 638
 639         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 640         if (retval) {
 641                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 642                           error_message(retval)));
 643                 /* If we have an error in this, we want to display it,
 644                    but continue as though we deleted it */
 645         }
 646         return True;
 647 }
 648
 649 /*
 650   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 651 */
 652 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 653                                        krb5_auth_context *auth_context,
 654                                        const krb5_flags ap_req_options,
 655                                        const char *principal,
 656                                        krb5_ccache ccache,
 657                                        krb5_data *outbuf,
 658                                        time_t *expire_time)
 659 {
 660         krb5_error_code           retval;
 661         krb5_principal    server;
 662         krb5_creds              * credsp;
 663         krb5_creds                creds;
 664         krb5_data in_data;
 665         bool creds_ready = False;
 666         int i = 0, maxtries = 3;
 667
 668         ZERO_STRUCT(in_data);
 669
 670         retval = smb_krb5_parse_name(context, principal, &server);
 671         if (retval) {
 672                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 673                 return retval;
 674         }
 675
 676         /* obtain ticket & session key */
 677         ZERO_STRUCT(creds);
 678         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 679                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 680                          error_message(retval)));
 681                 goto cleanup_princ;
 682         }
 683
 684         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 685                 /* This can commonly fail on smbd startup with no ticket in the cache.
 686                  * Report at higher level than 1. */
 687                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 688                          error_message(retval)));
 689                 goto cleanup_creds;
 690         }
 691
 692         while (!creds_ready && (i < maxtries)) {
 693
 694                 if ((retval = krb5_get_credentials(context, 0, ccache,
 695                                                    &creds, &credsp))) {
 696                         DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
 697                                  principal, error_message(retval)));
 698                         goto cleanup_creds;
 699                 }
 700
 701                 /* cope with ticket being in the future due to clock skew */
 702                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 703                         time_t t = time(NULL);
 704                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 705                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 706                         krb5_set_real_time(context, t + time_offset + 1, 0);
 707                 }
 708
 709                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 710                         creds_ready = True;
 711                 }
 712
 713                 i++;
 714         }
 715
 716         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 717                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 718                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 719                   (unsigned)credsp->times.endtime));
 720
 721         if (expire_time) {
 722                 *expire_time = (time_t)credsp->times.endtime;
 723         }
 724
 725 #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)
 726         if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 727                 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 728                  as part of the kerberos exchange. */
 729
 730                 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 731
 732                 if( *auth_context == NULL ) {
 733                         /* Allocate if it has not yet been allocated. */
 734                         retval = krb5_auth_con_init( context, auth_context );
 735                         if (retval) {
 736                                 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n",
 737                                         error_message(retval)));
 738                                 goto cleanup_creds;
 739                         }
 740                 }
 741
 742                 retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock );
 743                 if (retval) {
 744                         DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setuseruserkey failed (%s)\n",
 745                                 error_message(retval)));
 746                         goto cleanup_creds;
 747                 }
 748
 749                 /* Must use a subkey for forwarded tickets. */
 750                 retval = krb5_auth_con_setflags( context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY);
 751                 if (retval) {
 752                         DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n",
 753                                 error_message(retval)));
 754                         goto cleanup_creds;
 755                 }
 756
 757                 retval = ads_krb5_get_fwd_ticket( context,
 758                                                 auth_context,
 759                                                 credsp,
 760                                                 ccache,
 761                                                 &in_data );
 762                 if (retval) {
 763                         DEBUG( 3, ("ads_krb5_get_fwd_ticket failed (%s)\n",
 764                                    error_message( retval ) ) );
 765
 766                         /*
 767                          * This is not fatal. Delete the *auth_context and continue
 768                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 769                          */
 770
 771                         if (in_data.data) {
 772                                 free( in_data.data );
 773                                 in_data.data = NULL;
 774                                 in_data.length = 0;
 775                         }
 776                         krb5_auth_con_free(context, *auth_context);
 777                         *auth_context = NULL;
 778                 }
 779         }
 780 #endif
 781
 782         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 783                                       &in_data, credsp, outbuf);
 784         if (retval) {
 785                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 786                          error_message(retval)));
 787         }
 788
 789         if (in_data.data) {
 790                 free( in_data.data );
 791                 in_data.length = 0;
 792         }
 793
 794         krb5_free_creds(context, credsp);
 795
 796 cleanup_creds:
 797         krb5_free_cred_contents(context, &creds);
 798
 799 cleanup_princ:
 800         krb5_free_principal(context, server);
 801
 802         return retval;
 803 }
 804
 805 /*
 806   get a kerberos5 ticket for the given service
 807 */
 808 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
 809                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 810                         uint32 extra_ap_opts, const char *ccname,
 811                         time_t *tgs_expire)
 812
 813 {
 814         krb5_error_code retval;
 815         krb5_data packet;
 816         krb5_context context = NULL;
 817         krb5_ccache ccdef = NULL;
 818         krb5_auth_context auth_context = NULL;
 819         krb5_enctype enc_types[] = {
 820 #ifdef ENCTYPE_ARCFOUR_HMAC
 821                 ENCTYPE_ARCFOUR_HMAC,
 822 #endif
 823                 ENCTYPE_DES_CBC_MD5,
 824                 ENCTYPE_DES_CBC_CRC,
 825                 ENCTYPE_NULL};
 826
 827         initialize_krb5_error_table();
 828         retval = krb5_init_context(&context);
 829         if (retval) {
 830                 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
 831                          error_message(retval)));
 832                 goto failed;
 833         }
 834
 835         if (time_offset != 0) {
 836                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 837         }
 838
 839         if ((retval = krb5_cc_resolve(context, ccname ?
 840                         ccname : krb5_cc_default_name(context), &ccdef))) {
 841                 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
 842                          error_message(retval)));
 843                 goto failed;
 844         }
 845
 846         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 847                 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
 848                          error_message(retval)));
 849                 goto failed;
 850         }
 851
 852         if ((retval = ads_krb5_mk_req(context,
 853                                         &auth_context,
 854                                         AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 855                                         principal,
 856                                         ccdef, &packet,
 857                                         tgs_expire))) {
 858                 goto failed;
 859         }
 860
 861         get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
 862
 863         *ticket = data_blob(packet.data, packet.length);
 864
 865         kerberos_free_data_contents(context, &packet);
 866
 867 failed:
 868
 869         if ( context ) {
 870                 if (ccdef)
 871                         krb5_cc_close(context, ccdef);
 872                 if (auth_context)
 873                         krb5_auth_con_free(context, auth_context);
 874                 krb5_free_context(context);
 875         }
 876
 877         return retval;
 878 }
 879
 880  bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
 881  {
 882         krb5_keyblock *skey = NULL;
 883         krb5_error_code err = 0;
 884         bool ret = false;
 885
 886         if (remote) {
 887                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 888         } else {
 889                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 890         }
 891
 892         if (err || skey == NULL) {
 893                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 894                 goto done;
 895         }
 896
 897         DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
 898         *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 899         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 900
 901         ret = true;
 902
 903  done:
 904         if (skey) {
 905                 krb5_free_keyblock(context, skey);
 906         }
 907
 908         return ret;
 909  }
 910
 911
 912 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 913  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 914
 915  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 916 {
 917         static krb5_data kdata;
 918
 919         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 920         kdata.length = strlen((const char *)kdata.data);
 921         return &kdata;
 922 }
 923 #endif
 924
 925  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 926 {
 927 /* Try krb5_free_keytab_entry_contents first, since
 928  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 929  * krb5_kt_free_entry but only has a prototype for the first, while the
 930  * second is considered private.
 931  */
 932 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 933         return krb5_free_keytab_entry_contents(context, kt_entry);
 934 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
 935         return krb5_kt_free_entry(context, kt_entry);
 936 #else
 937 #error UNKNOWN_KT_FREE_FUNCTION
 938 #endif
 939 }
 940
 941  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 942                                      struct PAC_SIGNATURE_DATA *sig)
 943 {
 944 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 945         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 946         cksum->checksum.length  = sig->signature.length;
 947         cksum->checksum.data    = sig->signature.data;
 948 #else
 949         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 950         cksum->length           = sig->signature.length;
 951         cksum->contents         = sig->signature.data;
 952 #endif
 953 }
 954
 955  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 956                                           const krb5_keyblock *keyblock,
 957                                          krb5_keyusage usage,
 958                                          krb5_checksum *cksum,
 959                                          uint8 *data,
 960                                          size_t length)
 961 {
 962         krb5_error_code ret;
 963
 964         /* verify the checksum */
 965
 966         /* welcome to the wonderful world of samba's kerberos abstraction layer:
 967          *
 968          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
 969          * -----------------------------------------------------------------------------
 970          * krb5_c_verify_checksum       -                       works           works
 971          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
 972          */
 973
 974 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
 975         {
 976                 krb5_boolean checksum_valid = False;
 977                 krb5_data input;
 978
 979                 input.data = (char *)data;
 980                 input.length = length;
 981
 982                 ret = krb5_c_verify_checksum(context,
 983                                              keyblock,
 984                                              usage,
 985                                              &input,
 986                                              cksum,
 987                                              &checksum_valid);
 988                 if (ret) {
 989                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
 990                                 error_message(ret)));
 991                         return ret;
 992                 }
 993
 994                 if (!checksum_valid)
 995                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
 996         }
 997
 998 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
 999
1000         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1001          * without enctype and it ignores any key_usage types - Guenther */
1002
1003         {
1004
1005                 krb5_crypto crypto;
1006                 ret = krb5_crypto_init(context,
1007                                        keyblock,
1008                                        0,
1009                                        &crypto);
1010                 if (ret) {
1011                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1012                                 error_message(ret)));
1013                         return ret;
1014                 }
1015
1016                 ret = krb5_verify_checksum(context,
1017                                            crypto,
1018                                            usage,
1019                                            data,
1020                                            length,
1021                                            cksum);
1022
1023                 krb5_crypto_destroy(context, crypto);
1024         }
1025
1026 #else
1027 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1028 #endif
1029
1030         return ret;
1031 }
1032
1033  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1034 {
1035 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1036         return tkt->enc_part2->times.authtime;
1037 #else
1038         return tkt->ticket.authtime;
1039 #endif
1040 }
1041
1042 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1043 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1044 {
1045 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1046         if (ap_req->ticket->enc_part.kvno)
1047                 return ap_req->ticket->enc_part.kvno;
1048 #else /* Heimdal */
1049         if (ap_req->ticket.enc_part.kvno)
1050                 return *ap_req->ticket.enc_part.kvno;
1051 #endif
1052         return 0;
1053 }
1054
1055 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1056 {
1057 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1058         return ap_req->ticket.enc_part.etype;
1059 #else /* MIT */
1060         return ap_req->ticket->enc_part.enctype;
1061 #endif
1062 }
1063 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1064
1065 static krb5_error_code
1066 get_key_from_keytab(krb5_context context,
1067                     krb5_const_principal server,
1068                     krb5_enctype enctype,
1069                     krb5_kvno kvno,
1070                     krb5_keyblock **out_key)
1071 {
1072         krb5_keytab_entry entry;
1073         krb5_error_code ret;
1074         krb5_keytab keytab;
1075         char *name = NULL;
1076         krb5_keyblock *keyp;
1077
1078         /* We have to open a new keytab handle here, as MIT does
1079            an implicit open/getnext/close on krb5_kt_get_entry. We
1080            may be in the middle of a keytab enumeration when this is
1081            called. JRA. */
1082
1083         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1084         if (ret) {
1085                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1086                 return ret;
1087         }
1088
1089         if ( DEBUGLEVEL >= 10 ) {
1090                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1091                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1092                                 kvno, enctype, name));
1093                         TALLOC_FREE(name);
1094                 }
1095         }
1096
1097         ret = krb5_kt_get_entry(context,
1098                                 keytab,
1099                                 server,
1100                                 kvno,
1101                                 enctype,
1102                                 &entry);
1103
1104         if (ret) {
1105                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1106                 goto out;
1107         }
1108
1109         keyp = KRB5_KT_KEY(&entry);
1110
1111         ret = krb5_copy_keyblock(context, keyp, out_key);
1112         if (ret) {
1113                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1114                 goto out;
1115         }
1116
1117         smb_krb5_kt_free_entry(context, &entry);
1118
1119 out:
1120         krb5_kt_close(context, keytab);
1121         return ret;
1122 }
1123
1124 /* Prototypes */
1125
1126  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1127                                                  const krb5_data *inbuf,
1128                                                  krb5_kvno *kvno,
1129                                                  krb5_enctype *enctype)
1130 {
1131 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1132         {
1133                 krb5_error_code ret;
1134                 krb5_ap_req ap_req;
1135
1136                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1137                 if (ret)
1138                         return ret;
1139
1140                 *kvno = get_kvno_from_ap_req(&ap_req);
1141                 *enctype = get_enctype_from_ap_req(&ap_req);
1142
1143                 free_AP_REQ(&ap_req);
1144                 return 0;
1145         }
1146 #endif
1147
1148         /* Possibly not an appropriate error code. */
1149         return KRB5KDC_ERR_BADOPTION;
1150 }
1151
1152  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1153                                                         krb5_auth_context *auth_context,
1154                                                         const krb5_data *inbuf,
1155                                                         krb5_const_principal server,
1156                                                         krb5_keytab keytab,
1157                                                         krb5_flags *ap_req_options,
1158                                                         krb5_ticket **ticket,
1159                                                         krb5_keyblock **keyblock)
1160 {
1161         krb5_error_code ret;
1162         krb5_kvno kvno;
1163         krb5_enctype enctype;
1164         krb5_keyblock *local_keyblock;
1165
1166         ret = krb5_rd_req(context,
1167                           auth_context,
1168                           inbuf,
1169                           server,
1170                           keytab,
1171                           ap_req_options,
1172                           ticket);
1173         if (ret) {
1174                 return ret;
1175         }
1176
1177 #ifdef KRB5_TICKET_HAS_KEYINFO
1178         enctype = (*ticket)->enc_part.enctype;
1179         kvno = (*ticket)->enc_part.kvno;
1180 #else
1181         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1182         if (ret) {
1183                 return ret;
1184         }
1185 #endif
1186
1187         ret = get_key_from_keytab(context,
1188                                   server,
1189                                   enctype,
1190                                   kvno,
1191                                   &local_keyblock);
1192         if (ret) {
1193                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1194                 goto out;
1195         }
1196
1197 out:
1198         if (ret && local_keyblock != NULL) {
1199                 krb5_free_keyblock(context, local_keyblock);
1200         } else {
1201                 *keyblock = local_keyblock;
1202         }
1203
1204         return ret;
1205 }
1206
1207  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1208                                             const char *name,
1209                                             krb5_principal *principal)
1210 {
1211 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1212         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1213 #endif
1214
1215         /* we are cheating here because parse_name will in fact set the realm.
1216          * We don't care as the only caller of smb_krb5_parse_name_norealm
1217          * ignores the realm anyway when calling
1218          * smb_krb5_principal_compare_any_realm later - Guenther */
1219
1220         return smb_krb5_parse_name(context, name, principal);
1221 }
1222
1223  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1224                                           krb5_const_principal princ1,
1225                                           krb5_const_principal princ2)
1226 {
1227 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1228
1229         return krb5_principal_compare_any_realm(context, princ1, princ2);
1230
1231 /* krb5_princ_size is a macro in MIT */
1232 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1233
1234         int i, len1, len2;
1235         const krb5_data *p1, *p2;
1236
1237         len1 = krb5_princ_size(context, princ1);
1238         len2 = krb5_princ_size(context, princ2);
1239
1240         if (len1 != len2)
1241                 return False;
1242
1243         for (i = 0; i < len1; i++) {
1244
1245                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1246                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1247
1248                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1249                         return False;
1250         }
1251
1252         return True;
1253 #else
1254 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1255 #endif
1256 }
1257
1258  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1259                                        const char *client_string,       /* gd@BER.SUSE.DE */
1260                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1261                                        time_t *expire_time)
1262 {
1263         krb5_error_code ret;
1264         krb5_context context = NULL;
1265         krb5_ccache ccache = NULL;
1266         krb5_principal client = NULL;
1267         krb5_creds creds, creds_in, *creds_out = NULL;
1268
1269         ZERO_STRUCT(creds);
1270         ZERO_STRUCT(creds_in);
1271
1272         initialize_krb5_error_table();
1273         ret = krb5_init_context(&context);
1274         if (ret) {
1275                 goto done;
1276         }
1277
1278         if (!ccache_string) {
1279                 ccache_string = krb5_cc_default_name(context);
1280         }
1281
1282         if (!ccache_string) {
1283                 ret = EINVAL;
1284                 goto done;
1285         }
1286
1287         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1288
1289         /* FIXME: we should not fall back to defaults */
1290         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1291         if (ret) {
1292                 goto done;
1293         }
1294
1295         if (client_string) {
1296                 ret = smb_krb5_parse_name(context, client_string, &client);
1297                 if (ret) {
1298                         goto done;
1299                 }
1300         } else {
1301                 ret = krb5_cc_get_principal(context, ccache, &client);
1302                 if (ret) {
1303                         goto done;
1304                 }
1305         }
1306
1307 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1308         {
1309                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1310                 if (ret) {
1311                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1312                         goto done;
1313                 }
1314         }
1315 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1316         {
1317                 krb5_kdc_flags flags;
1318                 krb5_realm *client_realm = NULL;
1319
1320                 ret = krb5_copy_principal(context, client, &creds_in.client);
1321                 if (ret) {
1322                         goto done;
1323                 }
1324
1325                 if (service_string) {
1326                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1327                         if (ret) {
1328                                 goto done;
1329                         }
1330                 } else {
1331                         /* build tgt service by default */
1332                         client_realm = krb5_princ_realm(context, creds_in.client);
1333                         if (!client_realm) {
1334                                 ret = ENOMEM;
1335                                 goto done;
1336                         }
1337                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1338                         if (ret) {
1339                                 goto done;
1340                         }
1341                 }
1342
1343                 flags.i = 0;
1344                 flags.b.renewable = flags.b.renew = True;
1345
1346                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1347                 if (ret) {
1348                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1349                         goto done;
1350                 }
1351
1352                 creds = *creds_out;
1353         }
1354 #else
1355 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1356 #endif
1357
1358         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1359         ret = krb5_cc_initialize(context, ccache, client);
1360         if (ret) {
1361                 goto done;
1362         }
1363
1364         ret = krb5_cc_store_cred(context, ccache, &creds);
1365
1366         if (expire_time) {
1367                 *expire_time = (time_t) creds.times.endtime;
1368         }
1369
1370 done:
1371         krb5_free_cred_contents(context, &creds_in);
1372
1373         if (creds_out) {
1374                 krb5_free_creds(context, creds_out);
1375         } else {
1376                 krb5_free_cred_contents(context, &creds);
1377         }
1378
1379         if (client) {
1380                 krb5_free_principal(context, client);
1381         }
1382         if (ccache) {
1383                 krb5_cc_close(context, ccache);
1384         }
1385         if (context) {
1386                 krb5_free_context(context);
1387         }
1388
1389         return ret;
1390 }
1391
1392  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1393 {
1394         krb5_error_code ret = 0;
1395         if (addr == NULL) {
1396                 return ret;
1397         }
1398 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1399         krb5_free_addresses(context, addr->addrs);
1400 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1401         ret = krb5_free_addresses(context, addr->addrs);
1402         SAFE_FREE(addr->addrs);
1403 #endif
1404         SAFE_FREE(addr);
1405         addr = NULL;
1406         return ret;
1407 }
1408
1409  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1410 {
1411         krb5_error_code ret = 0;
1412         nstring buf;
1413 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1414         krb5_address **addrs = NULL;
1415 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1416         krb5_addresses *addrs = NULL;
1417 #endif
1418
1419         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1420         if (*kerb_addr == NULL) {
1421                 return ENOMEM;
1422         }
1423
1424         put_name(buf, global_myname(), ' ', 0x20);
1425
1426 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1427         {
1428                 int num_addr = 2;
1429
1430                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1431                 if (addrs == NULL) {
1432                         SAFE_FREE(*kerb_addr);
1433                         return ENOMEM;
1434                 }
1435
1436                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1437
1438                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1439                 if (addrs[0] == NULL) {
1440                         SAFE_FREE(addrs);
1441                         SAFE_FREE(*kerb_addr);
1442                         return ENOMEM;
1443                 }
1444
1445                 addrs[0]->magic = KV5M_ADDRESS;
1446                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1447                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1448                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1449                 if (addrs[0]->contents == NULL) {
1450                         SAFE_FREE(addrs[0]);
1451                         SAFE_FREE(addrs);
1452                         SAFE_FREE(*kerb_addr);
1453                         return ENOMEM;
1454                 }
1455
1456                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1457
1458                 addrs[1] = NULL;
1459         }
1460 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1461         {
1462                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1463                 if (addrs == NULL) {
1464                         SAFE_FREE(*kerb_addr);
1465                         return ENOMEM;
1466                 }
1467
1468                 memset(addrs, 0, sizeof(krb5_addresses));
1469
1470                 addrs->len = 1;
1471                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1472                 if (addrs->val == NULL) {
1473                         SAFE_FREE(addrs);
1474                         SAFE_FREE(kerb_addr);
1475                         return ENOMEM;
1476                 }
1477
1478                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1479                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1480                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1481                 if (addrs->val[0].address.data == NULL) {
1482                         SAFE_FREE(addrs->val);
1483                         SAFE_FREE(addrs);
1484                         SAFE_FREE(*kerb_addr);
1485                         return ENOMEM;
1486                 }
1487
1488                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1489         }
1490 #else
1491 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1492 #endif
1493         (*kerb_addr)->addrs = addrs;
1494
1495         return ret;
1496 }
1497
1498  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1499 {
1500 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1501         krb5_free_error_contents(context, krberror);
1502 #else /* MIT */
1503         krb5_free_error(context, krberror);
1504 #endif
1505 }
1506
1507  krb5_error_code handle_krberror_packet(krb5_context context,
1508                                         krb5_data *packet)
1509 {
1510         krb5_error_code ret;
1511         bool got_error_code = False;
1512
1513         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1514
1515 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1516         {
1517                 krb5_error krberror;
1518
1519                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1520                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1521                                 error_message(ret)));
1522                         return ret;
1523                 }
1524
1525                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1526                         ret = (krb5_error_code) krberror.error_code;
1527                         got_error_code = True;
1528                 }
1529
1530                 smb_krb5_free_error(context, &krberror);
1531         }
1532 #else /* MIT */
1533         {
1534                 krb5_error *krberror;
1535
1536                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1537                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1538                                 error_message(ret)));
1539                         return ret;
1540                 }
1541
1542                 if (krberror->e_data.data == NULL) {
1543                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1544                         got_error_code = True;
1545                 }
1546                 smb_krb5_free_error(context, krberror);
1547         }
1548 #endif
1549         if (got_error_code) {
1550                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1551                         error_message(ret), ret));
1552         }
1553         return ret;
1554 }
1555
1556  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1557                                             krb5_get_init_creds_opt **opt)
1558 {
1559 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1560         /* Heimdal or modern MIT version */
1561         return krb5_get_init_creds_opt_alloc(context, opt);
1562 #else
1563         /* Historical MIT version */
1564         krb5_get_init_creds_opt *my_opt;
1565
1566         *opt = NULL;
1567
1568         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1569                 return ENOMEM;
1570         }
1571
1572         krb5_get_init_creds_opt_init(my_opt);
1573
1574         *opt =  my_opt;
1575         return 0;
1576 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1577 }
1578
1579  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1580                                 krb5_get_init_creds_opt *opt)
1581 {
1582 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1583
1584 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1585         /* Modern MIT or Heimdal version */
1586         krb5_get_init_creds_opt_free(context, opt);
1587 #else
1588         /* Heimdal version */
1589         krb5_get_init_creds_opt_free(opt);
1590 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1591
1592 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1593         /* Historical MIT version */
1594         SAFE_FREE(opt);
1595         opt = NULL;
1596 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1597 }
1598
1599  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1600 {
1601         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1602 }
1603
1604
1605 /* caller needs to free etype_s */
1606  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1607                                             krb5_enctype enctype,
1608                                             char **etype_s)
1609 {
1610 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1611         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1612 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1613         char buf[256];
1614         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1615         if (ret) {
1616                 return ret;
1617         }
1618         *etype_s = SMB_STRDUP(buf);
1619         if (!*etype_s) {
1620                 return ENOMEM;
1621         }
1622         return ret;
1623 #else
1624 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1625 #endif
1626 }
1627
1628  krb5_error_code smb_krb5_mk_error(krb5_context context,
1629                                 krb5_error_code error_code,
1630                                 const krb5_principal server,
1631                                 krb5_data *reply)
1632 {
1633 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1634         /*
1635          * The MIT interface is *terrible*.
1636          * We have to construct this ourselves...
1637          */
1638         krb5_error e;
1639
1640         memset(&e, 0, sizeof(e));
1641         krb5_us_timeofday(context, &e.stime, &e.susec);
1642         e.server = server;
1643 #if defined(krb5_err_base)
1644         e.error = error_code - krb5_err_base;
1645 #elif defined(ERROR_TABLE_BASE_krb5)
1646         e.error = error_code - ERROR_TABLE_BASE_krb5;
1647 #else
1648         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1649 #endif
1650
1651         return krb5_mk_error(context, &e, reply);
1652 #else /* Heimdal. */
1653         return krb5_mk_error(context,
1654                                 error_code,
1655                                 NULL,
1656                                 NULL, /* e_data */
1657                                 NULL,
1658                                 server,
1659                                 NULL,
1660                                 NULL,
1661                                 reply);
1662 #endif
1663 }
1664
1665 /**********************************************************************
1666  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1667  * allows to process non-default keytab names.
1668  * @param context krb5_context
1669  * @param keytab_name_req string
1670  * @param write_access bool if writable keytab is required
1671  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1672  * @return krb5_error_code
1673 **********************************************************************/
1674
1675 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1676 #ifndef MAX_KEYTAB_NAME_LEN
1677 #define MAX_KEYTAB_NAME_LEN 1100
1678 #endif
1679
1680  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1681                                       const char *keytab_name_req,
1682                                       bool write_access,
1683                                       krb5_keytab *keytab)
1684 {
1685         krb5_error_code ret = 0;
1686         TALLOC_CTX *mem_ctx;
1687         char keytab_string[MAX_KEYTAB_NAME_LEN];
1688         char *kt_str = NULL;
1689         bool found_valid_name = False;
1690         const char *pragma = "FILE";
1691         const char *tmp = NULL;
1692
1693         if (!write_access && !keytab_name_req) {
1694                 /* caller just wants to read the default keytab readonly, so be it */
1695                 return krb5_kt_default(context, keytab);
1696         }
1697
1698         mem_ctx = talloc_init("smb_krb5_open_keytab");
1699         if (!mem_ctx) {
1700                 return ENOMEM;
1701         }
1702
1703 #ifdef HAVE_WRFILE_KEYTAB
1704         if (write_access) {
1705                 pragma = "WRFILE";
1706         }
1707 #endif
1708
1709         if (keytab_name_req) {
1710
1711                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1712                         ret = KRB5_CONFIG_NOTENUFSPACE;
1713                         goto out;
1714                 }
1715
1716                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1717                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1718                         tmp = keytab_name_req;
1719                         goto resolve;
1720                 }
1721
1722                 if (keytab_name_req[0] != '/') {
1723                         ret = KRB5_KT_BADNAME;
1724                         goto out;
1725                 }
1726
1727                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1728                 if (!tmp) {
1729                         ret = ENOMEM;
1730                         goto out;
1731                 }
1732
1733                 goto resolve;
1734         }
1735
1736         /* we need to handle more complex keytab_strings, like:
1737          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1738
1739         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1740         if (ret) {
1741                 goto out;
1742         }
1743
1744         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1745
1746         tmp = talloc_strdup(mem_ctx, keytab_string);
1747         if (!tmp) {
1748                 ret = ENOMEM;
1749                 goto out;
1750         }
1751
1752         if (strncmp(tmp, "ANY:", 4) == 0) {
1753                 tmp += 4;
1754         }
1755
1756         memset(&keytab_string, '\0', sizeof(keytab_string));
1757
1758         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1759                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1760                         found_valid_name = True;
1761                         tmp = kt_str;
1762                         tmp += 7;
1763                 }
1764
1765                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1766                         found_valid_name = True;
1767                         tmp = kt_str;
1768                         tmp += 5;
1769                 }
1770
1771                 if (tmp[0] == '/') {
1772                         /* Treat as a FILE: keytab definition. */
1773                         found_valid_name = true;
1774                 }
1775
1776                 if (found_valid_name) {
1777                         if (tmp[0] != '/') {
1778                                 ret = KRB5_KT_BADNAME;
1779                                 goto out;
1780                         }
1781
1782                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1783                         if (!tmp) {
1784                                 ret = ENOMEM;
1785                                 goto out;
1786                         }
1787                         break;
1788                 }
1789         }
1790
1791         if (!found_valid_name) {
1792                 ret = KRB5_KT_UNKNOWN_TYPE;
1793                 goto out;
1794         }
1795
1796  resolve:
1797         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1798         ret = krb5_kt_resolve(context, tmp, keytab);
1799
1800  out:
1801         TALLOC_FREE(mem_ctx);
1802         return ret;
1803 }
1804
1805 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1806                                      krb5_context context,
1807                                      krb5_keytab keytab,
1808                                      const char **keytab_name)
1809 {
1810         char keytab_string[MAX_KEYTAB_NAME_LEN];
1811         krb5_error_code ret = 0;
1812
1813         ret = krb5_kt_get_name(context, keytab,
1814                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1815         if (ret) {
1816                 return ret;
1817         }
1818
1819         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1820         if (!*keytab_name) {
1821                 return ENOMEM;
1822         }
1823
1824         return ret;
1825 }
1826
1827 #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)
1828 /**************************************************************
1829 Routine: ads_krb5_get_fwd_ticket
1830  Description:
1831     When a service ticket is flagged as trusted
1832     for delegation we should provide a forwardable
1833     ticket so that the remote host can act on our
1834     behalf.  This is done by taking the 2nd forwardable
1835     TGT and storing it in the GSS-API authenticator
1836     "checksum".  This routine will populate
1837     the krb5_data authenticator with this TGT.
1838  Parameters:
1839     krb5_context context: The kerberos context for this authentication.
1840     krb5_auth_context:    The authentication context.
1841     krb5_creds *credsp:   The ticket credentials (AS-REP).
1842     krb5_ccache ccache:   The credentials cache.
1843     krb5_data &authenticator: The checksum field that will store the TGT, and
1844      authenticator.data must be freed by the caller.
1845
1846  Returns:
1847     krb5_error_code: 0 if no errors, otherwise set.
1848 **************************************************************/
1849
1850 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1851                                          krb5_auth_context *auth_context,
1852                                          krb5_creds *credsp,
1853                                          krb5_ccache ccache,
1854                                          krb5_data *authenticator)
1855 {
1856         krb5_data fwdData;
1857         krb5_error_code retval = 0;
1858         char *pChksum = NULL;
1859         char *p = NULL;
1860
1861         ZERO_STRUCT(fwdData);
1862         ZERO_STRUCTP(authenticator);
1863
1864         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1865                                 *auth_context,  /* Authentication context [in] */
1866                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
1867                                 credsp->client, /* Client principal for the tgt [in] */
1868                                 credsp->server, /* Server principal for the tgt [in] */
1869                                 ccache,         /* Credential cache to use for storage [in] */
1870                                 1,              /* Turn on for "Forwardable ticket" [in] */
1871                                 &fwdData );     /* Resulting response [out] */
1872
1873
1874         if (retval) {
1875                 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1876                         error_message(retval)));
1877                 goto out;
1878         }
1879
1880         if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1881                 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1882                 retval = EINVAL;
1883                 goto out;
1884         }
1885
1886         /* We're going to allocate a gssChecksum structure with a little
1887            extra data the length of the kerberos credentials length
1888            (APPLICATION 22) so that we can pack it on the end of the structure.
1889         */
1890
1891         pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1892         if (!pChksum) {
1893                 retval = ENOMEM;
1894                 goto out;
1895         }
1896
1897         p = pChksum;
1898
1899         SIVAL(p, 0, GSSAPI_BNDLENGTH);
1900         p += 4;
1901
1902         /* Zero out the bindings fields */
1903         memset(p, '\0', GSSAPI_BNDLENGTH );
1904         p += GSSAPI_BNDLENGTH;
1905
1906         SIVAL(p, 0, GSS_C_DELEG_FLAG );
1907         p += 4;
1908         SSVAL(p, 0, 1 );
1909         p += 2;
1910         SSVAL(p, 0, fwdData.length );
1911         p += 2;
1912
1913         /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1914         memcpy(p, fwdData.data, fwdData.length );
1915         p += fwdData.length;
1916
1917         /* We need to do this in order to allow our GSS-API  */
1918         retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1919         if (retval) {
1920                 goto out;
1921         }
1922
1923         /* We now have a service ticket, now turn it into an AP-REQ. */
1924         authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1925
1926         /* Caller should call free() when they're done with this. */
1927         authenticator->data = (char *)pChksum;
1928
1929   out:
1930
1931         /* Remove that input data, we never needed it anyway. */
1932         if (fwdData.length > 0) {
1933                 krb5_free_data_contents( context, &fwdData );
1934         }
1935
1936         return retval;
1937 }
1938 #endif
1939
1940 #else /* HAVE_KRB5 */
1941  /* this saves a few linking headaches */
1942  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1943                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1944                         const char *ccname, time_t *tgs_expire)
1945 {
1946          DEBUG(0,("NO KERBEROS SUPPORT\n"));
1947          return 1;
1948 }
1949
1950 #endif