source3/libsmb/clikrb5.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    simple kerberos5 routines for active directory
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Luke Howard 2002-2003
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   7    Copyright (C) Guenther Deschner 2005-2009
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "smb_krb5.h"
  25 #include "authdata.h"
  26
  27 #ifdef HAVE_KRB5
  28
  29 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  30 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  31 #define GSSAPI_CHECKSUM_SIZE (12+GSSAPI_BNDLENGTH)
  32
  33 #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)
  34 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
  35                                          krb5_auth_context *auth_context,
  36                                          krb5_creds *credsp,
  37                                          krb5_ccache ccache,
  38                                          krb5_data *authenticator);
  39 #endif
  40
  41 /**************************************************************
  42  Wrappers around kerberos string functions that convert from
  43  utf8 -> unix charset and vica versa.
  44 **************************************************************/
  45
  46 /**************************************************************
  47  krb5_parse_name that takes a UNIX charset.
  48 **************************************************************/
  49
  50  krb5_error_code smb_krb5_parse_name(krb5_context context,
  51                                 const char *name, /* in unix charset */
  52                                 krb5_principal *principal)
  53 {
  54         krb5_error_code ret;
  55         char *utf8_name;
  56         size_t converted_size;
  57
  58         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  59                 return ENOMEM;
  60         }
  61
  62         ret = krb5_parse_name(context, utf8_name, principal);
  63         TALLOC_FREE(utf8_name);
  64         return ret;
  65 }
  66
  67 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
  68 /**************************************************************
  69  krb5_parse_name_norealm that takes a UNIX charset.
  70 **************************************************************/
  71
  72 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
  73                                 const char *name, /* in unix charset */
  74                                 krb5_principal *principal)
  75 {
  76         krb5_error_code ret;
  77         char *utf8_name;
  78         size_t converted_size;
  79
  80         *principal = NULL;
  81         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  82                 return ENOMEM;
  83         }
  84
  85         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  86         TALLOC_FREE(utf8_name);
  87         return ret;
  88 }
  89 #endif
  90
  91 /**************************************************************
  92  krb5_parse_name that returns a UNIX charset name. Must
  93  be freed with talloc_free() call.
  94 **************************************************************/
  95
  96 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
  97                                       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_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 112                 krb5_free_unparsed_name(context, utf8_name);
 113                 return ENOMEM;
 114         }
 115         krb5_free_unparsed_name(context, utf8_name);
 116         return 0;
 117 }
 118
 119 #ifndef HAVE_KRB5_SET_REAL_TIME
 120 /*
 121  * This function is not in the Heimdal mainline.
 122  */
 123  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 124 {
 125         krb5_error_code ret;
 126         int32_t sec, usec;
 127
 128         ret = krb5_us_timeofday(context, &sec, &usec);
 129         if (ret)
 130                 return ret;
 131
 132         context->kdc_sec_offset = seconds - sec;
 133         context->kdc_usec_offset = microseconds - usec;
 134
 135         return 0;
 136 }
 137 #endif
 138
 139 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 140
 141 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 142
 143 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 144  * to krb5_set_default_tgs_ktypes. See
 145  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 146  *
 147  * If the MIT libraries are not exporting internal symbols, we will end up in
 148  * this branch, which is correct. Otherwise we will continue to use the
 149  * internal symbol
 150  */
 151  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 152 {
 153     return krb5_set_default_tgs_enctypes(ctx, enc);
 154 }
 155
 156 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 157
 158 /* Heimdal */
 159  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 160 {
 161         return krb5_set_default_in_tkt_etypes(ctx, enc);
 162 }
 163
 164 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 165
 166 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 167
 168 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 169 /* HEIMDAL */
 170  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 171 {
 172         memset(pkaddr, '\0', sizeof(krb5_address));
 173 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 174         if (paddr->ss_family == AF_INET6) {
 175                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 176                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 177                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 178                 return true;
 179         }
 180 #endif
 181         if (paddr->ss_family == AF_INET) {
 182                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 183                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 184                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 185                 return true;
 186         }
 187         return false;
 188 }
 189 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 190 /* MIT */
 191  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 192 {
 193         memset(pkaddr, '\0', sizeof(krb5_address));
 194 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 195         if (paddr->ss_family == AF_INET6) {
 196                 pkaddr->addrtype = ADDRTYPE_INET6;
 197                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 198                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 199                 return true;
 200         }
 201 #endif
 202         if (paddr->ss_family == AF_INET) {
 203                 pkaddr->addrtype = ADDRTYPE_INET;
 204                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 205                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 206                 return true;
 207         }
 208         return false;
 209 }
 210 #else
 211 #error UNKNOWN_ADDRTYPE
 212 #endif
 213
 214 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 215 static int create_kerberos_key_from_string_direct(krb5_context context,
 216                                                   krb5_principal host_princ,
 217                                                   krb5_data *password,
 218                                                   krb5_keyblock *key,
 219                                                   krb5_enctype enctype)
 220 {
 221         int ret = 0;
 222         krb5_data salt;
 223         krb5_encrypt_block eblock;
 224
 225         ret = krb5_principal2salt(context, host_princ, &salt);
 226         if (ret) {
 227                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 228                 return ret;
 229         }
 230         krb5_use_enctype(context, &eblock, enctype);
 231         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 232         SAFE_FREE(salt.data);
 233
 234         return ret;
 235 }
 236 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 237 static int create_kerberos_key_from_string_direct(krb5_context context,
 238                                                   krb5_principal host_princ,
 239                                                   krb5_data *password,
 240                                                   krb5_keyblock *key,
 241                                                   krb5_enctype enctype)
 242 {
 243         int ret;
 244         krb5_salt salt;
 245
 246         ret = krb5_get_pw_salt(context, host_princ, &salt);
 247         if (ret) {
 248                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 249                 return ret;
 250         }
 251
 252         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 253         krb5_free_salt(context, salt);
 254
 255         return ret;
 256 }
 257 #else
 258 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 259 #endif
 260
 261  int create_kerberos_key_from_string(krb5_context context,
 262                                         krb5_principal host_princ,
 263                                         krb5_data *password,
 264                                         krb5_keyblock *key,
 265                                         krb5_enctype enctype,
 266                                         bool no_salt)
 267 {
 268         krb5_principal salt_princ = NULL;
 269         int ret;
 270         /*
 271          * Check if we've determined that the KDC is salting keys for this
 272          * principal/enctype in a non-obvious way.  If it is, try to match
 273          * its behavior.
 274          */
 275         if (no_salt) {
 276                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 277                 if (!KRB5_KEY_DATA(key)) {
 278                         return ENOMEM;
 279                 }
 280                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 281                 KRB5_KEY_LENGTH(key) = password->length;
 282                 KRB5_KEY_TYPE(key) = enctype;
 283                 return 0;
 284         }
 285         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 286         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 287         if (salt_princ) {
 288                 krb5_free_principal(context, salt_princ);
 289         }
 290         return ret;
 291 }
 292
 293 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 294  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 295                                             krb5_enctype **enctypes)
 296 {
 297         return krb5_get_permitted_enctypes(context, enctypes);
 298 }
 299 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 300  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 301                                             krb5_enctype **enctypes)
 302 {
 303         return krb5_get_default_in_tkt_etypes(context, enctypes);
 304 }
 305 #else
 306 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 307 #endif
 308
 309 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 310  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 311                                         krb5_auth_context auth_context,
 312                                         krb5_keyblock *keyblock)
 313 {
 314         return krb5_auth_con_setkey(context, auth_context, keyblock);
 315 }
 316 #endif
 317
 318 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 319                            DATA_BLOB *edata,
 320                            DATA_BLOB *edata_out)
 321 {
 322         DATA_BLOB edata_contents;
 323         ASN1_DATA *data;
 324         int edata_type;
 325
 326         if (!edata->length) {
 327                 return False;
 328         }
 329
 330         data = asn1_init(mem_ctx);
 331         if (data == NULL) {
 332                 return false;
 333         }
 334
 335         asn1_load(data, *edata);
 336         asn1_start_tag(data, ASN1_SEQUENCE(0));
 337         asn1_start_tag(data, ASN1_CONTEXT(1));
 338         asn1_read_Integer(data, &edata_type);
 339
 340         if (edata_type != KRB5_PADATA_PW_SALT) {
 341                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 342                         KRB5_PADATA_PW_SALT, edata_type));
 343                 asn1_free(data);
 344                 return False;
 345         }
 346
 347         asn1_start_tag(data, ASN1_CONTEXT(2));
 348         asn1_read_OctetString(data, talloc_autofree_context(), &edata_contents);
 349         asn1_end_tag(data);
 350         asn1_end_tag(data);
 351         asn1_end_tag(data);
 352         asn1_free(data);
 353
 354         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 355
 356         data_blob_free(&edata_contents);
 357
 358         return True;
 359 }
 360
 361
 362 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 363 {
 364         DATA_BLOB pac_contents;
 365         ASN1_DATA *data;
 366         int data_type;
 367
 368         if (!auth_data->length) {
 369                 return False;
 370         }
 371
 372         data = asn1_init(mem_ctx);
 373         if (data == NULL) {
 374                 return false;
 375         }
 376
 377         asn1_load(data, *auth_data);
 378         asn1_start_tag(data, ASN1_SEQUENCE(0));
 379         asn1_start_tag(data, ASN1_SEQUENCE(0));
 380         asn1_start_tag(data, ASN1_CONTEXT(0));
 381         asn1_read_Integer(data, &data_type);
 382
 383         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 384                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 385                 asn1_free(data);
 386                 return False;
 387         }
 388
 389         asn1_end_tag(data);
 390         asn1_start_tag(data, ASN1_CONTEXT(1));
 391         asn1_read_OctetString(data, talloc_autofree_context(), &pac_contents);
 392         asn1_end_tag(data);
 393         asn1_end_tag(data);
 394         asn1_end_tag(data);
 395         asn1_free(data);
 396
 397         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 398
 399         data_blob_free(&pac_contents);
 400
 401         return True;
 402 }
 403
 404  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 405 {
 406         DATA_BLOB auth_data_wrapped;
 407         bool got_auth_data_pac = False;
 408         int i;
 409
 410 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 411         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 412             tkt->enc_part2->authorization_data[0] &&
 413             tkt->enc_part2->authorization_data[0]->length)
 414         {
 415                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 416
 417                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 418                             KRB5_AUTHDATA_IF_RELEVANT) {
 419                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 420                                         tkt->enc_part2->authorization_data[i]->ad_type));
 421                                 continue;
 422                         }
 423
 424                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 425                                                       tkt->enc_part2->authorization_data[i]->length);
 426
 427                         /* check if it is a PAC */
 428                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 429                         data_blob_free(&auth_data_wrapped);
 430
 431                         if (got_auth_data_pac) {
 432                                 return true;
 433                         }
 434                 }
 435
 436                 return got_auth_data_pac;
 437         }
 438
 439 #else
 440         if (tkt->ticket.authorization_data &&
 441             tkt->ticket.authorization_data->len)
 442         {
 443                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 444
 445                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 446                             KRB5_AUTHDATA_IF_RELEVANT) {
 447                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 448                                         tkt->ticket.authorization_data->val[i].ad_type));
 449                                 continue;
 450                         }
 451
 452                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 453                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 454
 455                         /* check if it is a PAC */
 456                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 457                         data_blob_free(&auth_data_wrapped);
 458
 459                         if (got_auth_data_pac) {
 460                                 return true;
 461                         }
 462                 }
 463
 464                 return got_auth_data_pac;
 465         }
 466 #endif
 467         return False;
 468 }
 469
 470  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 471 {
 472 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 473         return tkt->enc_part2->client;
 474 #else
 475         return tkt->client;
 476 #endif
 477 }
 478
 479 #if !defined(HAVE_KRB5_LOCATE_KDC)
 480
 481 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 482  * to a public interface for this functionality, so we have to be able to live
 483  * without it if the MIT libraries are hiding their internal symbols.
 484  */
 485
 486 #if defined(KRB5_KRBHST_INIT)
 487 /* Heimdal */
 488  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 489 {
 490         krb5_krbhst_handle hnd;
 491         krb5_krbhst_info *hinfo;
 492         krb5_error_code rc;
 493         int num_kdcs, i;
 494         struct sockaddr *sa;
 495         struct addrinfo *ai;
 496
 497         *addr_pp = NULL;
 498         *naddrs = 0;
 499
 500         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 501         if (rc) {
 502                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 503                 return rc;
 504         }
 505
 506         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 507                 ;
 508
 509         krb5_krbhst_reset(ctx, hnd);
 510
 511         if (!num_kdcs) {
 512                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 513                 krb5_krbhst_free(ctx, hnd);
 514                 return -1;
 515         }
 516
 517         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 518         if (!sa) {
 519                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 520                 krb5_krbhst_free(ctx, hnd);
 521                 naddrs = 0;
 522                 return -1;
 523         }
 524
 525         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 526
 527         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 528
 529 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 530                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 531                 if (rc) {
 532                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 533                         continue;
 534                 }
 535 #endif
 536                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 537                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 538         }
 539
 540         krb5_krbhst_free(ctx, hnd);
 541
 542         *naddrs = num_kdcs;
 543         *addr_pp = sa;
 544         return 0;
 545 }
 546
 547 #else /* ! defined(KRB5_KRBHST_INIT) */
 548
 549  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 550                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 551 {
 552         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 553         return KRB5_KDC_UNREACH;
 554 }
 555
 556 #endif /* KRB5_KRBHST_INIT */
 557
 558 #else /* ! HAVE_KRB5_LOCATE_KDC */
 559
 560  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 561                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 562 {
 563         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 564 }
 565
 566 #endif /* HAVE_KRB5_LOCATE_KDC */
 567
 568 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 569  void krb5_free_unparsed_name(krb5_context context, char *val)
 570 {
 571         SAFE_FREE(val);
 572 }
 573 #endif
 574
 575  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 576 {
 577 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 578         if (pdata->data) {
 579                 krb5_free_data_contents(context, pdata);
 580         }
 581 #else
 582         SAFE_FREE(pdata->data);
 583 #endif
 584 }
 585
 586  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 587 {
 588 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 589         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 590 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 591         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 592 #else
 593 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 594 #endif
 595 }
 596
 597  bool kerberos_compatible_enctypes(krb5_context context,
 598                                   krb5_enctype enctype1,
 599                                   krb5_enctype enctype2)
 600 {
 601 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 602         krb5_boolean similar = 0;
 603
 604         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 605         return similar ? True : False;
 606 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 607         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 608 #endif
 609 }
 610
 611 static bool ads_cleanup_expired_creds(krb5_context context,
 612                                       krb5_ccache  ccache,
 613                                       krb5_creds  *credsp)
 614 {
 615         krb5_error_code retval;
 616         const char *cc_type = krb5_cc_get_type(context, ccache);
 617
 618         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 619                   cc_type, krb5_cc_get_name(context, ccache),
 620                   http_timestring(talloc_tos(), credsp->times.endtime)));
 621
 622         /* we will probably need new tickets if the current ones
 623            will expire within 10 seconds.
 624         */
 625         if (credsp->times.endtime >= (time(NULL) + 10))
 626                 return False;
 627
 628         /* heimdal won't remove creds from a file ccache, and
 629            perhaps we shouldn't anyway, since internally we
 630            use memory ccaches, and a FILE one probably means that
 631            we're using creds obtained outside of our exectuable
 632         */
 633         if (strequal(cc_type, "FILE")) {
 634                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 635                 return False;
 636         }
 637
 638         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 639         if (retval) {
 640                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 641                           error_message(retval)));
 642                 /* If we have an error in this, we want to display it,
 643                    but continue as though we deleted it */
 644         }
 645         return True;
 646 }
 647
 648 /*
 649   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 650 */
 651 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 652                                        krb5_auth_context *auth_context,
 653                                        const krb5_flags ap_req_options,
 654                                        const char *principal,
 655                                        krb5_ccache ccache,
 656                                        krb5_data *outbuf,
 657                                        time_t *expire_time,
 658                                        const char *impersonate_princ_s)
 659 {
 660         krb5_error_code           retval;
 661         krb5_principal    server;
 662         krb5_principal impersonate_princ = NULL;
 663         krb5_creds              * credsp;
 664         krb5_creds                creds;
 665         krb5_data in_data;
 666         bool creds_ready = False;
 667         int i = 0, maxtries = 3;
 668
 669         ZERO_STRUCT(in_data);
 670
 671         retval = smb_krb5_parse_name(context, principal, &server);
 672         if (retval) {
 673                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 674                 return retval;
 675         }
 676
 677         if (impersonate_princ_s) {
 678                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 679                                              &impersonate_princ);
 680                 if (retval) {
 681                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 682                         goto cleanup_princ;
 683                 }
 684         }
 685
 686         /* obtain ticket & session key */
 687         ZERO_STRUCT(creds);
 688         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 689                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 690                          error_message(retval)));
 691                 goto cleanup_princ;
 692         }
 693
 694         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 695                 /* This can commonly fail on smbd startup with no ticket in the cache.
 696                  * Report at higher level than 1. */
 697                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 698                          error_message(retval)));
 699                 goto cleanup_creds;
 700         }
 701
 702         while (!creds_ready && (i < maxtries)) {
 703
 704                 if ((retval = smb_krb5_get_credentials(context, ccache,
 705                                                        creds.client,
 706                                                        creds.server,
 707                                                        impersonate_princ,
 708                                                        &credsp))) {
 709                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 710                                 principal, error_message(retval)));
 711                         goto cleanup_creds;
 712                 }
 713
 714                 /* cope with ticket being in the future due to clock skew */
 715                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 716                         time_t t = time(NULL);
 717                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 718                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 719                         krb5_set_real_time(context, t + time_offset + 1, 0);
 720                 }
 721
 722                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 723                         creds_ready = True;
 724                 }
 725
 726                 i++;
 727         }
 728
 729         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 730                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 731                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 732                   (unsigned)credsp->times.endtime));
 733
 734         if (expire_time) {
 735                 *expire_time = (time_t)credsp->times.endtime;
 736         }
 737
 738 #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)
 739         if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 740                 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 741                  as part of the kerberos exchange. */
 742
 743                 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 744
 745                 if( *auth_context == NULL ) {
 746                         /* Allocate if it has not yet been allocated. */
 747                         retval = krb5_auth_con_init( context, auth_context );
 748                         if (retval) {
 749                                 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n",
 750                                         error_message(retval)));
 751                                 goto cleanup_creds;
 752                         }
 753                 }
 754
 755                 retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock );
 756                 if (retval) {
 757                         DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setuseruserkey failed (%s)\n",
 758                                 error_message(retval)));
 759                         goto cleanup_creds;
 760                 }
 761
 762                 /* Must use a subkey for forwarded tickets. */
 763                 retval = krb5_auth_con_setflags( context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY);
 764                 if (retval) {
 765                         DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n",
 766                                 error_message(retval)));
 767                         goto cleanup_creds;
 768                 }
 769
 770                 retval = ads_krb5_get_fwd_ticket( context,
 771                                                 auth_context,
 772                                                 credsp,
 773                                                 ccache,
 774                                                 &in_data );
 775                 if (retval) {
 776                         DEBUG( 3, ("ads_krb5_get_fwd_ticket failed (%s)\n",
 777                                    error_message( retval ) ) );
 778
 779                         /*
 780                          * This is not fatal. Delete the *auth_context and continue
 781                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 782                          */
 783
 784                         if (in_data.data) {
 785                                 free( in_data.data );
 786                                 in_data.data = NULL;
 787                                 in_data.length = 0;
 788                         }
 789                         krb5_auth_con_free(context, *auth_context);
 790                         *auth_context = NULL;
 791                 }
 792         }
 793 #endif
 794
 795         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 796                                       &in_data, credsp, outbuf);
 797         if (retval) {
 798                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 799                          error_message(retval)));
 800         }
 801
 802         if (in_data.data) {
 803                 free( in_data.data );
 804                 in_data.length = 0;
 805         }
 806
 807         krb5_free_creds(context, credsp);
 808
 809 cleanup_creds:
 810         krb5_free_cred_contents(context, &creds);
 811
 812 cleanup_princ:
 813         krb5_free_principal(context, server);
 814         if (impersonate_princ) {
 815                 krb5_free_principal(context, impersonate_princ);
 816         }
 817
 818         return retval;
 819 }
 820
 821 /*
 822   get a kerberos5 ticket for the given service
 823 */
 824 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
 825                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 826                         uint32 extra_ap_opts, const char *ccname,
 827                         time_t *tgs_expire,
 828                         const char *impersonate_princ_s)
 829
 830 {
 831         krb5_error_code retval;
 832         krb5_data packet;
 833         krb5_context context = NULL;
 834         krb5_ccache ccdef = NULL;
 835         krb5_auth_context auth_context = NULL;
 836         krb5_enctype enc_types[] = {
 837 #ifdef ENCTYPE_ARCFOUR_HMAC
 838                 ENCTYPE_ARCFOUR_HMAC,
 839 #endif
 840                 ENCTYPE_DES_CBC_MD5,
 841                 ENCTYPE_DES_CBC_CRC,
 842                 ENCTYPE_NULL};
 843
 844         initialize_krb5_error_table();
 845         retval = krb5_init_context(&context);
 846         if (retval) {
 847                 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
 848                          error_message(retval)));
 849                 goto failed;
 850         }
 851
 852         if (time_offset != 0) {
 853                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 854         }
 855
 856         if ((retval = krb5_cc_resolve(context, ccname ?
 857                         ccname : krb5_cc_default_name(context), &ccdef))) {
 858                 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
 859                          error_message(retval)));
 860                 goto failed;
 861         }
 862
 863         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 864                 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
 865                          error_message(retval)));
 866                 goto failed;
 867         }
 868
 869         if ((retval = ads_krb5_mk_req(context,
 870                                         &auth_context,
 871                                         AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 872                                         principal,
 873                                         ccdef, &packet,
 874                                         tgs_expire,
 875                                         impersonate_princ_s))) {
 876                 goto failed;
 877         }
 878
 879         get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
 880
 881         *ticket = data_blob(packet.data, packet.length);
 882
 883         kerberos_free_data_contents(context, &packet);
 884
 885 failed:
 886
 887         if ( context ) {
 888                 if (ccdef)
 889                         krb5_cc_close(context, ccdef);
 890                 if (auth_context)
 891                         krb5_auth_con_free(context, auth_context);
 892                 krb5_free_context(context);
 893         }
 894
 895         return retval;
 896 }
 897
 898  bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
 899  {
 900         krb5_keyblock *skey = NULL;
 901         krb5_error_code err = 0;
 902         bool ret = false;
 903
 904         if (remote) {
 905                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 906         } else {
 907                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 908         }
 909
 910         if (err || skey == NULL) {
 911                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 912                 goto done;
 913         }
 914
 915         DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
 916         *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 917         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 918
 919         ret = true;
 920
 921  done:
 922         if (skey) {
 923                 krb5_free_keyblock(context, skey);
 924         }
 925
 926         return ret;
 927  }
 928
 929
 930 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 931  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 932
 933  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 934 {
 935         static krb5_data kdata;
 936
 937         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 938         kdata.length = strlen((const char *)kdata.data);
 939         return &kdata;
 940 }
 941 #endif
 942
 943  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 944 {
 945 /* Try krb5_free_keytab_entry_contents first, since
 946  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 947  * krb5_kt_free_entry but only has a prototype for the first, while the
 948  * second is considered private.
 949  */
 950 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 951         return krb5_free_keytab_entry_contents(context, kt_entry);
 952 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
 953         return krb5_kt_free_entry(context, kt_entry);
 954 #else
 955 #error UNKNOWN_KT_FREE_FUNCTION
 956 #endif
 957 }
 958
 959  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 960                                      struct PAC_SIGNATURE_DATA *sig)
 961 {
 962 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 963         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 964         cksum->checksum.length  = sig->signature.length;
 965         cksum->checksum.data    = sig->signature.data;
 966 #else
 967         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 968         cksum->length           = sig->signature.length;
 969         cksum->contents         = sig->signature.data;
 970 #endif
 971 }
 972
 973  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 974                                           const krb5_keyblock *keyblock,
 975                                          krb5_keyusage usage,
 976                                          krb5_checksum *cksum,
 977                                          uint8 *data,
 978                                          size_t length)
 979 {
 980         krb5_error_code ret;
 981
 982         /* verify the checksum */
 983
 984         /* welcome to the wonderful world of samba's kerberos abstraction layer:
 985          *
 986          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
 987          * -----------------------------------------------------------------------------
 988          * krb5_c_verify_checksum       -                       works           works
 989          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
 990          */
 991
 992 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
 993         {
 994                 krb5_boolean checksum_valid = False;
 995                 krb5_data input;
 996
 997                 input.data = (char *)data;
 998                 input.length = length;
 999
1000                 ret = krb5_c_verify_checksum(context,
1001                                              keyblock,
1002                                              usage,
1003                                              &input,
1004                                              cksum,
1005                                              &checksum_valid);
1006                 if (ret) {
1007                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1008                                 error_message(ret)));
1009                         return ret;
1010                 }
1011
1012                 if (!checksum_valid)
1013                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1014         }
1015
1016 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1017
1018         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1019          * without enctype and it ignores any key_usage types - Guenther */
1020
1021         {
1022
1023                 krb5_crypto crypto;
1024                 ret = krb5_crypto_init(context,
1025                                        keyblock,
1026                                        0,
1027                                        &crypto);
1028                 if (ret) {
1029                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1030                                 error_message(ret)));
1031                         return ret;
1032                 }
1033
1034                 ret = krb5_verify_checksum(context,
1035                                            crypto,
1036                                            usage,
1037                                            data,
1038                                            length,
1039                                            cksum);
1040
1041                 krb5_crypto_destroy(context, crypto);
1042         }
1043
1044 #else
1045 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1046 #endif
1047
1048         return ret;
1049 }
1050
1051  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1052 {
1053 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1054         return tkt->enc_part2->times.authtime;
1055 #else
1056         return tkt->ticket.authtime;
1057 #endif
1058 }
1059
1060 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1061 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1062 {
1063 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1064         if (ap_req->ticket->enc_part.kvno)
1065                 return ap_req->ticket->enc_part.kvno;
1066 #else /* Heimdal */
1067         if (ap_req->ticket.enc_part.kvno)
1068                 return *ap_req->ticket.enc_part.kvno;
1069 #endif
1070         return 0;
1071 }
1072
1073 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1074 {
1075 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1076         return ap_req->ticket.enc_part.etype;
1077 #else /* MIT */
1078         return ap_req->ticket->enc_part.enctype;
1079 #endif
1080 }
1081 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1082
1083 static krb5_error_code
1084 get_key_from_keytab(krb5_context context,
1085                     krb5_const_principal server,
1086                     krb5_enctype enctype,
1087                     krb5_kvno kvno,
1088                     krb5_keyblock **out_key)
1089 {
1090         krb5_keytab_entry entry;
1091         krb5_error_code ret;
1092         krb5_keytab keytab;
1093         char *name = NULL;
1094         krb5_keyblock *keyp;
1095
1096         /* We have to open a new keytab handle here, as MIT does
1097            an implicit open/getnext/close on krb5_kt_get_entry. We
1098            may be in the middle of a keytab enumeration when this is
1099            called. JRA. */
1100
1101         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1102         if (ret) {
1103                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1104                 return ret;
1105         }
1106
1107         if ( DEBUGLEVEL >= 10 ) {
1108                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1109                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1110                                 kvno, enctype, name));
1111                         TALLOC_FREE(name);
1112                 }
1113         }
1114
1115         ret = krb5_kt_get_entry(context,
1116                                 keytab,
1117                                 server,
1118                                 kvno,
1119                                 enctype,
1120                                 &entry);
1121
1122         if (ret) {
1123                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1124                 goto out;
1125         }
1126
1127         keyp = KRB5_KT_KEY(&entry);
1128
1129         ret = krb5_copy_keyblock(context, keyp, out_key);
1130         if (ret) {
1131                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1132                 goto out;
1133         }
1134
1135         smb_krb5_kt_free_entry(context, &entry);
1136
1137 out:
1138         krb5_kt_close(context, keytab);
1139         return ret;
1140 }
1141
1142 /* Prototypes */
1143
1144  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1145                                                  const krb5_data *inbuf,
1146                                                  krb5_kvno *kvno,
1147                                                  krb5_enctype *enctype)
1148 {
1149 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1150         {
1151                 krb5_error_code ret;
1152                 krb5_ap_req ap_req;
1153
1154                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1155                 if (ret)
1156                         return ret;
1157
1158                 *kvno = get_kvno_from_ap_req(&ap_req);
1159                 *enctype = get_enctype_from_ap_req(&ap_req);
1160
1161                 free_AP_REQ(&ap_req);
1162                 return 0;
1163         }
1164 #endif
1165
1166         /* Possibly not an appropriate error code. */
1167         return KRB5KDC_ERR_BADOPTION;
1168 }
1169
1170  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1171                                                         krb5_auth_context *auth_context,
1172                                                         const krb5_data *inbuf,
1173                                                         krb5_const_principal server,
1174                                                         krb5_keytab keytab,
1175                                                         krb5_flags *ap_req_options,
1176                                                         krb5_ticket **ticket,
1177                                                         krb5_keyblock **keyblock)
1178 {
1179         krb5_error_code ret;
1180         krb5_kvno kvno;
1181         krb5_enctype enctype;
1182         krb5_keyblock *local_keyblock;
1183
1184         ret = krb5_rd_req(context,
1185                           auth_context,
1186                           inbuf,
1187                           server,
1188                           keytab,
1189                           ap_req_options,
1190                           ticket);
1191         if (ret) {
1192                 return ret;
1193         }
1194
1195 #ifdef KRB5_TICKET_HAS_KEYINFO
1196         enctype = (*ticket)->enc_part.enctype;
1197         kvno = (*ticket)->enc_part.kvno;
1198 #else
1199         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1200         if (ret) {
1201                 return ret;
1202         }
1203 #endif
1204
1205         ret = get_key_from_keytab(context,
1206                                   server,
1207                                   enctype,
1208                                   kvno,
1209                                   &local_keyblock);
1210         if (ret) {
1211                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1212                 goto out;
1213         }
1214
1215 out:
1216         if (ret && local_keyblock != NULL) {
1217                 krb5_free_keyblock(context, local_keyblock);
1218         } else {
1219                 *keyblock = local_keyblock;
1220         }
1221
1222         return ret;
1223 }
1224
1225  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1226                                             const char *name,
1227                                             krb5_principal *principal)
1228 {
1229 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1230         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1231 #endif
1232
1233         /* we are cheating here because parse_name will in fact set the realm.
1234          * We don't care as the only caller of smb_krb5_parse_name_norealm
1235          * ignores the realm anyway when calling
1236          * smb_krb5_principal_compare_any_realm later - Guenther */
1237
1238         return smb_krb5_parse_name(context, name, principal);
1239 }
1240
1241  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1242                                           krb5_const_principal princ1,
1243                                           krb5_const_principal princ2)
1244 {
1245 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1246
1247         return krb5_principal_compare_any_realm(context, princ1, princ2);
1248
1249 /* krb5_princ_size is a macro in MIT */
1250 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1251
1252         int i, len1, len2;
1253         const krb5_data *p1, *p2;
1254
1255         len1 = krb5_princ_size(context, princ1);
1256         len2 = krb5_princ_size(context, princ2);
1257
1258         if (len1 != len2)
1259                 return False;
1260
1261         for (i = 0; i < len1; i++) {
1262
1263                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1264                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1265
1266                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1267                         return False;
1268         }
1269
1270         return True;
1271 #else
1272 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1273 #endif
1274 }
1275
1276  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1277                                        const char *client_string,       /* gd@BER.SUSE.DE */
1278                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1279                                        time_t *expire_time)
1280 {
1281         krb5_error_code ret;
1282         krb5_context context = NULL;
1283         krb5_ccache ccache = NULL;
1284         krb5_principal client = NULL;
1285         krb5_creds creds, creds_in, *creds_out = NULL;
1286
1287         ZERO_STRUCT(creds);
1288         ZERO_STRUCT(creds_in);
1289
1290         initialize_krb5_error_table();
1291         ret = krb5_init_context(&context);
1292         if (ret) {
1293                 goto done;
1294         }
1295
1296         if (!ccache_string) {
1297                 ccache_string = krb5_cc_default_name(context);
1298         }
1299
1300         if (!ccache_string) {
1301                 ret = EINVAL;
1302                 goto done;
1303         }
1304
1305         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1306
1307         /* FIXME: we should not fall back to defaults */
1308         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1309         if (ret) {
1310                 goto done;
1311         }
1312
1313         if (client_string) {
1314                 ret = smb_krb5_parse_name(context, client_string, &client);
1315                 if (ret) {
1316                         goto done;
1317                 }
1318         } else {
1319                 ret = krb5_cc_get_principal(context, ccache, &client);
1320                 if (ret) {
1321                         goto done;
1322                 }
1323         }
1324
1325 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1326         {
1327                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1328                 if (ret) {
1329                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1330                         goto done;
1331                 }
1332         }
1333 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1334         {
1335                 krb5_kdc_flags flags;
1336                 krb5_realm *client_realm = NULL;
1337
1338                 ret = krb5_copy_principal(context, client, &creds_in.client);
1339                 if (ret) {
1340                         goto done;
1341                 }
1342
1343                 if (service_string) {
1344                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1345                         if (ret) {
1346                                 goto done;
1347                         }
1348                 } else {
1349                         /* build tgt service by default */
1350                         client_realm = krb5_princ_realm(context, creds_in.client);
1351                         if (!client_realm) {
1352                                 ret = ENOMEM;
1353                                 goto done;
1354                         }
1355                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1356                         if (ret) {
1357                                 goto done;
1358                         }
1359                 }
1360
1361                 flags.i = 0;
1362                 flags.b.renewable = flags.b.renew = True;
1363
1364                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1365                 if (ret) {
1366                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1367                         goto done;
1368                 }
1369
1370                 creds = *creds_out;
1371         }
1372 #else
1373 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1374 #endif
1375
1376         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1377         ret = krb5_cc_initialize(context, ccache, client);
1378         if (ret) {
1379                 goto done;
1380         }
1381
1382         ret = krb5_cc_store_cred(context, ccache, &creds);
1383
1384         if (expire_time) {
1385                 *expire_time = (time_t) creds.times.endtime;
1386         }
1387
1388 done:
1389         krb5_free_cred_contents(context, &creds_in);
1390
1391         if (creds_out) {
1392                 krb5_free_creds(context, creds_out);
1393         } else {
1394                 krb5_free_cred_contents(context, &creds);
1395         }
1396
1397         if (client) {
1398                 krb5_free_principal(context, client);
1399         }
1400         if (ccache) {
1401                 krb5_cc_close(context, ccache);
1402         }
1403         if (context) {
1404                 krb5_free_context(context);
1405         }
1406
1407         return ret;
1408 }
1409
1410  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1411 {
1412         krb5_error_code ret = 0;
1413         if (addr == NULL) {
1414                 return ret;
1415         }
1416 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1417         krb5_free_addresses(context, addr->addrs);
1418 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1419         ret = krb5_free_addresses(context, addr->addrs);
1420         SAFE_FREE(addr->addrs);
1421 #endif
1422         SAFE_FREE(addr);
1423         addr = NULL;
1424         return ret;
1425 }
1426
1427  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1428 {
1429         krb5_error_code ret = 0;
1430         nstring buf;
1431 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1432         krb5_address **addrs = NULL;
1433 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1434         krb5_addresses *addrs = NULL;
1435 #endif
1436
1437         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1438         if (*kerb_addr == NULL) {
1439                 return ENOMEM;
1440         }
1441
1442         put_name(buf, global_myname(), ' ', 0x20);
1443
1444 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1445         {
1446                 int num_addr = 2;
1447
1448                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1449                 if (addrs == NULL) {
1450                         SAFE_FREE(*kerb_addr);
1451                         return ENOMEM;
1452                 }
1453
1454                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1455
1456                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1457                 if (addrs[0] == NULL) {
1458                         SAFE_FREE(addrs);
1459                         SAFE_FREE(*kerb_addr);
1460                         return ENOMEM;
1461                 }
1462
1463                 addrs[0]->magic = KV5M_ADDRESS;
1464                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1465                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1466                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1467                 if (addrs[0]->contents == NULL) {
1468                         SAFE_FREE(addrs[0]);
1469                         SAFE_FREE(addrs);
1470                         SAFE_FREE(*kerb_addr);
1471                         return ENOMEM;
1472                 }
1473
1474                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1475
1476                 addrs[1] = NULL;
1477         }
1478 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1479         {
1480                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1481                 if (addrs == NULL) {
1482                         SAFE_FREE(*kerb_addr);
1483                         return ENOMEM;
1484                 }
1485
1486                 memset(addrs, 0, sizeof(krb5_addresses));
1487
1488                 addrs->len = 1;
1489                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1490                 if (addrs->val == NULL) {
1491                         SAFE_FREE(addrs);
1492                         SAFE_FREE(kerb_addr);
1493                         return ENOMEM;
1494                 }
1495
1496                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1497                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1498                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1499                 if (addrs->val[0].address.data == NULL) {
1500                         SAFE_FREE(addrs->val);
1501                         SAFE_FREE(addrs);
1502                         SAFE_FREE(*kerb_addr);
1503                         return ENOMEM;
1504                 }
1505
1506                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1507         }
1508 #else
1509 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1510 #endif
1511         (*kerb_addr)->addrs = addrs;
1512
1513         return ret;
1514 }
1515
1516  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1517 {
1518 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1519         krb5_free_error_contents(context, krberror);
1520 #else /* MIT */
1521         krb5_free_error(context, krberror);
1522 #endif
1523 }
1524
1525  krb5_error_code handle_krberror_packet(krb5_context context,
1526                                         krb5_data *packet)
1527 {
1528         krb5_error_code ret;
1529         bool got_error_code = False;
1530
1531         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1532
1533 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1534         {
1535                 krb5_error krberror;
1536
1537                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1538                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1539                                 error_message(ret)));
1540                         return ret;
1541                 }
1542
1543                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1544                         ret = (krb5_error_code) krberror.error_code;
1545                         got_error_code = True;
1546                 }
1547
1548                 smb_krb5_free_error(context, &krberror);
1549         }
1550 #else /* MIT */
1551         {
1552                 krb5_error *krberror;
1553
1554                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1555                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1556                                 error_message(ret)));
1557                         return ret;
1558                 }
1559
1560                 if (krberror->e_data.data == NULL) {
1561 #if defined(ERROR_TABLE_BASE_krb5)
1562                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1563 #else
1564                         ret = (krb5_error_code)krberror->error;
1565 #endif
1566                         got_error_code = True;
1567                 }
1568                 smb_krb5_free_error(context, krberror);
1569         }
1570 #endif
1571         if (got_error_code) {
1572                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1573                         error_message(ret), ret));
1574         }
1575         return ret;
1576 }
1577
1578  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1579                                             krb5_get_init_creds_opt **opt)
1580 {
1581 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1582         /* Heimdal or modern MIT version */
1583         return krb5_get_init_creds_opt_alloc(context, opt);
1584 #else
1585         /* Historical MIT version */
1586         krb5_get_init_creds_opt *my_opt;
1587
1588         *opt = NULL;
1589
1590         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1591                 return ENOMEM;
1592         }
1593
1594         krb5_get_init_creds_opt_init(my_opt);
1595
1596         *opt =  my_opt;
1597         return 0;
1598 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1599 }
1600
1601  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1602                                 krb5_get_init_creds_opt *opt)
1603 {
1604 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1605
1606 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1607         /* Modern MIT or Heimdal version */
1608         krb5_get_init_creds_opt_free(context, opt);
1609 #else
1610         /* Heimdal version */
1611         krb5_get_init_creds_opt_free(opt);
1612 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1613
1614 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1615         /* Historical MIT version */
1616         SAFE_FREE(opt);
1617         opt = NULL;
1618 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1619 }
1620
1621  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1622 {
1623         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1624 }
1625
1626
1627 /* caller needs to free etype_s */
1628  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1629                                             krb5_enctype enctype,
1630                                             char **etype_s)
1631 {
1632 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1633         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1634 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1635         char buf[256];
1636         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1637         if (ret) {
1638                 return ret;
1639         }
1640         *etype_s = SMB_STRDUP(buf);
1641         if (!*etype_s) {
1642                 return ENOMEM;
1643         }
1644         return ret;
1645 #else
1646 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1647 #endif
1648 }
1649
1650  krb5_error_code smb_krb5_mk_error(krb5_context context,
1651                                 krb5_error_code error_code,
1652                                 const krb5_principal server,
1653                                 krb5_data *reply)
1654 {
1655 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1656         /*
1657          * The MIT interface is *terrible*.
1658          * We have to construct this ourselves...
1659          */
1660         krb5_error e;
1661
1662         memset(&e, 0, sizeof(e));
1663         krb5_us_timeofday(context, &e.stime, &e.susec);
1664         e.server = server;
1665 #if defined(krb5_err_base)
1666         e.error = error_code - krb5_err_base;
1667 #elif defined(ERROR_TABLE_BASE_krb5)
1668         e.error = error_code - ERROR_TABLE_BASE_krb5;
1669 #else
1670         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1671 #endif
1672
1673         return krb5_mk_error(context, &e, reply);
1674 #else /* Heimdal. */
1675         return krb5_mk_error(context,
1676                                 error_code,
1677                                 NULL,
1678                                 NULL, /* e_data */
1679                                 NULL,
1680                                 server,
1681                                 NULL,
1682                                 NULL,
1683                                 reply);
1684 #endif
1685 }
1686
1687 /**********************************************************************
1688  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1689  * allows to process non-default keytab names.
1690  * @param context krb5_context
1691  * @param keytab_name_req string
1692  * @param write_access bool if writable keytab is required
1693  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1694  * @return krb5_error_code
1695 **********************************************************************/
1696
1697 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1698 #ifndef MAX_KEYTAB_NAME_LEN
1699 #define MAX_KEYTAB_NAME_LEN 1100
1700 #endif
1701
1702  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1703                                       const char *keytab_name_req,
1704                                       bool write_access,
1705                                       krb5_keytab *keytab)
1706 {
1707         krb5_error_code ret = 0;
1708         TALLOC_CTX *mem_ctx;
1709         char keytab_string[MAX_KEYTAB_NAME_LEN];
1710         char *kt_str = NULL;
1711         bool found_valid_name = False;
1712         const char *pragma = "FILE";
1713         const char *tmp = NULL;
1714
1715         if (!write_access && !keytab_name_req) {
1716                 /* caller just wants to read the default keytab readonly, so be it */
1717                 return krb5_kt_default(context, keytab);
1718         }
1719
1720         mem_ctx = talloc_init("smb_krb5_open_keytab");
1721         if (!mem_ctx) {
1722                 return ENOMEM;
1723         }
1724
1725 #ifdef HAVE_WRFILE_KEYTAB
1726         if (write_access) {
1727                 pragma = "WRFILE";
1728         }
1729 #endif
1730
1731         if (keytab_name_req) {
1732
1733                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1734                         ret = KRB5_CONFIG_NOTENUFSPACE;
1735                         goto out;
1736                 }
1737
1738                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1739                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1740                         tmp = keytab_name_req;
1741                         goto resolve;
1742                 }
1743
1744                 if (keytab_name_req[0] != '/') {
1745                         ret = KRB5_KT_BADNAME;
1746                         goto out;
1747                 }
1748
1749                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1750                 if (!tmp) {
1751                         ret = ENOMEM;
1752                         goto out;
1753                 }
1754
1755                 goto resolve;
1756         }
1757
1758         /* we need to handle more complex keytab_strings, like:
1759          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1760
1761         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1762         if (ret) {
1763                 goto out;
1764         }
1765
1766         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1767
1768         tmp = talloc_strdup(mem_ctx, keytab_string);
1769         if (!tmp) {
1770                 ret = ENOMEM;
1771                 goto out;
1772         }
1773
1774         if (strncmp(tmp, "ANY:", 4) == 0) {
1775                 tmp += 4;
1776         }
1777
1778         memset(&keytab_string, '\0', sizeof(keytab_string));
1779
1780         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1781                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1782                         found_valid_name = True;
1783                         tmp = kt_str;
1784                         tmp += 7;
1785                 }
1786
1787                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1788                         found_valid_name = True;
1789                         tmp = kt_str;
1790                         tmp += 5;
1791                 }
1792
1793                 if (tmp[0] == '/') {
1794                         /* Treat as a FILE: keytab definition. */
1795                         found_valid_name = true;
1796                 }
1797
1798                 if (found_valid_name) {
1799                         if (tmp[0] != '/') {
1800                                 ret = KRB5_KT_BADNAME;
1801                                 goto out;
1802                         }
1803
1804                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1805                         if (!tmp) {
1806                                 ret = ENOMEM;
1807                                 goto out;
1808                         }
1809                         break;
1810                 }
1811         }
1812
1813         if (!found_valid_name) {
1814                 ret = KRB5_KT_UNKNOWN_TYPE;
1815                 goto out;
1816         }
1817
1818  resolve:
1819         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1820         ret = krb5_kt_resolve(context, tmp, keytab);
1821
1822  out:
1823         TALLOC_FREE(mem_ctx);
1824         return ret;
1825 }
1826
1827 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1828                                      krb5_context context,
1829                                      krb5_keytab keytab,
1830                                      const char **keytab_name)
1831 {
1832         char keytab_string[MAX_KEYTAB_NAME_LEN];
1833         krb5_error_code ret = 0;
1834
1835         ret = krb5_kt_get_name(context, keytab,
1836                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1837         if (ret) {
1838                 return ret;
1839         }
1840
1841         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1842         if (!*keytab_name) {
1843                 return ENOMEM;
1844         }
1845
1846         return ret;
1847 }
1848
1849 #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)
1850 /**************************************************************
1851 Routine: ads_krb5_get_fwd_ticket
1852  Description:
1853     When a service ticket is flagged as trusted
1854     for delegation we should provide a forwardable
1855     ticket so that the remote host can act on our
1856     behalf.  This is done by taking the 2nd forwardable
1857     TGT and storing it in the GSS-API authenticator
1858     "checksum".  This routine will populate
1859     the krb5_data authenticator with this TGT.
1860  Parameters:
1861     krb5_context context: The kerberos context for this authentication.
1862     krb5_auth_context:    The authentication context.
1863     krb5_creds *credsp:   The ticket credentials (AS-REP).
1864     krb5_ccache ccache:   The credentials cache.
1865     krb5_data &authenticator: The checksum field that will store the TGT, and
1866      authenticator.data must be freed by the caller.
1867
1868  Returns:
1869     krb5_error_code: 0 if no errors, otherwise set.
1870 **************************************************************/
1871
1872 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1873                                          krb5_auth_context *auth_context,
1874                                          krb5_creds *credsp,
1875                                          krb5_ccache ccache,
1876                                          krb5_data *authenticator)
1877 {
1878         krb5_data fwdData;
1879         krb5_error_code retval = 0;
1880         char *pChksum = NULL;
1881         char *p = NULL;
1882
1883 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
1884    but still has the symbol */
1885 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
1886 krb5_error_code krb5_auth_con_set_req_cksumtype(
1887         krb5_context     context,
1888         krb5_auth_context      auth_context,
1889         krb5_cksumtype     cksumtype);
1890 #endif
1891
1892         ZERO_STRUCT(fwdData);
1893         ZERO_STRUCTP(authenticator);
1894
1895         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1896                                 *auth_context,  /* Authentication context [in] */
1897                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
1898                                 credsp->client, /* Client principal for the tgt [in] */
1899                                 credsp->server, /* Server principal for the tgt [in] */
1900                                 ccache,         /* Credential cache to use for storage [in] */
1901                                 1,              /* Turn on for "Forwardable ticket" [in] */
1902                                 &fwdData );     /* Resulting response [out] */
1903
1904
1905         if (retval) {
1906                 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1907                         error_message(retval)));
1908                 goto out;
1909         }
1910
1911         if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1912                 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1913                 retval = EINVAL;
1914                 goto out;
1915         }
1916
1917         /* We're going to allocate a gssChecksum structure with a little
1918            extra data the length of the kerberos credentials length
1919            (APPLICATION 22) so that we can pack it on the end of the structure.
1920         */
1921
1922         pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1923         if (!pChksum) {
1924                 retval = ENOMEM;
1925                 goto out;
1926         }
1927
1928         p = pChksum;
1929
1930         SIVAL(p, 0, GSSAPI_BNDLENGTH);
1931         p += 4;
1932
1933         /* Zero out the bindings fields */
1934         memset(p, '\0', GSSAPI_BNDLENGTH );
1935         p += GSSAPI_BNDLENGTH;
1936
1937         SIVAL(p, 0, GSS_C_DELEG_FLAG );
1938         p += 4;
1939         SSVAL(p, 0, 1 );
1940         p += 2;
1941         SSVAL(p, 0, fwdData.length );
1942         p += 2;
1943
1944         /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1945         memcpy(p, fwdData.data, fwdData.length );
1946         p += fwdData.length;
1947
1948         /* We need to do this in order to allow our GSS-API  */
1949         retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1950         if (retval) {
1951                 goto out;
1952         }
1953
1954         /* We now have a service ticket, now turn it into an AP-REQ. */
1955         authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1956
1957         /* Caller should call free() when they're done with this. */
1958         authenticator->data = (char *)pChksum;
1959
1960   out:
1961
1962         /* Remove that input data, we never needed it anyway. */
1963         if (fwdData.length > 0) {
1964                 krb5_free_data_contents( context, &fwdData );
1965         }
1966
1967         return retval;
1968 }
1969 #endif
1970
1971 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1972     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1973     defined(HAVE_KRB5_GET_CREDS)
1974 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1975                                                              krb5_ccache ccache,
1976                                                              krb5_principal me,
1977                                                              krb5_principal server,
1978                                                              krb5_principal impersonate_princ,
1979                                                              krb5_creds **out_creds)
1980 {
1981         krb5_error_code ret;
1982         krb5_get_creds_opt opt;
1983
1984         ret = krb5_get_creds_opt_alloc(context, &opt);
1985         if (ret) {
1986                 goto done;
1987         }
1988         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1989
1990         if (impersonate_princ) {
1991                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1992                                                          impersonate_princ);
1993                 if (ret) {
1994                         goto done;
1995                 }
1996         }
1997
1998         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1999         if (ret) {
2000                 goto done;
2001         }
2002
2003  done:
2004         if (opt) {
2005                 krb5_get_creds_opt_free(context, opt);
2006         }
2007         return ret;
2008 }
2009 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2010
2011 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2012 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2013                                                          krb5_ccache ccache,
2014                                                          krb5_principal me,
2015                                                          krb5_principal server,
2016                                                          krb5_principal impersonate_princ,
2017                                                          krb5_creds **out_creds)
2018 {
2019         krb5_error_code ret;
2020         krb5_creds in_creds;
2021
2022 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2023 krb5_error_code KRB5_CALLCONV
2024 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2025                               krb5_ccache ccache, krb5_creds *in_creds,
2026                               krb5_data *subject_cert,
2027                               krb5_creds **out_creds);
2028 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2029
2030         ZERO_STRUCT(in_creds);
2031
2032         if (impersonate_princ) {
2033
2034                 in_creds.server = me;
2035                 in_creds.client = impersonate_princ;
2036
2037                 ret = krb5_get_credentials_for_user(context,
2038                                                     0, /* krb5_flags options */
2039                                                     ccache,
2040                                                     &in_creds,
2041                                                     NULL, /* krb5_data *subject_cert */
2042                                                     out_creds);
2043         } else {
2044                 in_creds.client = me;
2045                 in_creds.server = server;
2046
2047                 ret = krb5_get_credentials(context, 0, ccache,
2048                                            &in_creds, out_creds);
2049         }
2050
2051         return ret;
2052 }
2053 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2054
2055 /*
2056  * smb_krb5_get_credentials
2057  *
2058  * @brief Get krb5 credentials for a server
2059  *
2060  * @param[in] context           An initialized krb5_context
2061  * @param[in] ccache            An initialized krb5_ccache
2062  * @param[in] me                The krb5_principal of the caller
2063  * @param[in] server            The krb5_principal of the requested service
2064  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2065  * @param[out] out_creds        The returned krb5_creds structure
2066  * @return krb5_error_code
2067  *
2068  */
2069 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2070                                          krb5_ccache ccache,
2071                                          krb5_principal me,
2072                                          krb5_principal server,
2073                                          krb5_principal impersonate_princ,
2074                                          krb5_creds **out_creds)
2075 {
2076         krb5_error_code ret;
2077         krb5_creds *creds = NULL;
2078
2079         *out_creds = NULL;
2080
2081         if (impersonate_princ) {
2082 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2083                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2084 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2085                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2086 #else
2087                 ret = ENOTSUP;
2088 #endif
2089         } else {
2090                 krb5_creds in_creds;
2091
2092                 ZERO_STRUCT(in_creds);
2093
2094                 in_creds.client = me;
2095                 in_creds.server = server;
2096
2097                 ret = krb5_get_credentials(context, 0, ccache,
2098                                            &in_creds, &creds);
2099         }
2100         if (ret) {
2101                 goto done;
2102         }
2103
2104         ret = krb5_cc_store_cred(context, ccache, creds);
2105         if (ret) {
2106                 goto done;
2107         }
2108
2109         if (out_creds) {
2110                 *out_creds = creds;
2111         }
2112
2113  done:
2114         if (creds && ret) {
2115                 krb5_free_creds(context, creds);
2116         }
2117
2118         return ret;
2119 }
2120
2121 /*
2122  * smb_krb5_get_creds
2123  *
2124  * @brief Get krb5 credentials for a server
2125  *
2126  * @param[in] server_s          The string name of the service
2127  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2128  * @param[in] cc                The krb5 credential cache string name (optional)
2129  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2130  * @param[out] creds_p          The returned krb5_creds structure
2131  * @return krb5_error_code
2132  *
2133  */
2134 krb5_error_code smb_krb5_get_creds(const char *server_s,
2135                                    time_t time_offset,
2136                                    const char *cc,
2137                                    const char *impersonate_princ_s,
2138                                    krb5_creds **creds_p)
2139 {
2140         krb5_error_code ret;
2141         krb5_context context = NULL;
2142         krb5_principal me = NULL;
2143         krb5_principal server = NULL;
2144         krb5_principal impersonate_princ = NULL;
2145         krb5_creds *creds = NULL;
2146         krb5_ccache ccache = NULL;
2147
2148         *creds_p = NULL;
2149
2150         initialize_krb5_error_table();
2151         ret = krb5_init_context(&context);
2152         if (ret) {
2153                 goto done;
2154         }
2155
2156         if (time_offset != 0) {
2157                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2158         }
2159
2160         ret = krb5_cc_resolve(context, cc ? cc :
2161                 krb5_cc_default_name(context), &ccache);
2162         if (ret) {
2163                 goto done;
2164         }
2165
2166         ret = krb5_cc_get_principal(context, ccache, &me);
2167         if (ret) {
2168                 goto done;
2169         }
2170
2171         ret = smb_krb5_parse_name(context, server_s, &server);
2172         if (ret) {
2173                 goto done;
2174         }
2175
2176         if (impersonate_princ_s) {
2177                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2178                                           &impersonate_princ);
2179                 if (ret) {
2180                         goto done;
2181                 }
2182         }
2183
2184         ret = smb_krb5_get_credentials(context, ccache,
2185                                        me, server, impersonate_princ,
2186                                        &creds);
2187         if (ret) {
2188                 goto done;
2189         }
2190
2191         ret = krb5_cc_store_cred(context, ccache, creds);
2192         if (ret) {
2193                 goto done;
2194         }
2195
2196         if (creds_p) {
2197                 *creds_p = creds;
2198         }
2199
2200         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2201                 server_s));
2202
2203         if (impersonate_princ_s) {
2204                 char *client = NULL;
2205
2206                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2207                 if (ret) {
2208                         goto done;
2209                 }
2210                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2211                         client));
2212                 TALLOC_FREE(client);
2213         }
2214
2215  done:
2216         if (!context) {
2217                 return ret;
2218         }
2219
2220         if (creds && ret) {
2221                 krb5_free_creds(context, creds);
2222         }
2223         if (server) {
2224                 krb5_free_principal(context, server);
2225         }
2226         if (me) {
2227                 krb5_free_principal(context, me);
2228         }
2229         if (impersonate_princ) {
2230                 krb5_free_principal(context, impersonate_princ);
2231         }
2232         if (ccache) {
2233                 krb5_cc_close(context, ccache);
2234         }
2235         krb5_free_context(context);
2236
2237         return ret;
2238 }
2239
2240 /*
2241  * smb_krb5_principal_get_realm
2242  *
2243  * @brief Get realm of a principal
2244  *
2245  * @param[in] context           The krb5_context
2246  * @param[in] principal         The principal
2247  * @return pointer to the realm
2248  *
2249  */
2250
2251 char *smb_krb5_principal_get_realm(krb5_context context,
2252                                    krb5_principal principal)
2253 {
2254 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2255         return krb5_principal_get_realm(context, principal);
2256 #elif defined(krb5_princ_realm) /* MIT */
2257         krb5_data *realm;
2258         realm = krb5_princ_realm(context, principal);
2259         return (char *)realm->data;
2260 #else
2261         return NULL;
2262 #endif
2263 }
2264
2265 #else /* HAVE_KRB5 */
2266  /* this saves a few linking headaches */
2267  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
2268                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
2269                         const char *ccname, time_t *tgs_expire,
2270                         const char *impersonate_princ_s)
2271 {
2272          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2273          return 1;
2274 }
2275
2276 #endif