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 (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
  32                                                         bind field, flags field. */
  33
  34 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
  35    but still has the symbol */
  36 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
  37 krb5_error_code krb5_auth_con_set_req_cksumtype(
  38         krb5_context     context,
  39         krb5_auth_context      auth_context,
  40         krb5_cksumtype     cksumtype);
  41 #endif
  42
  43 /**************************************************************
  44  Wrappers around kerberos string functions that convert from
  45  utf8 -> unix charset and vica versa.
  46 **************************************************************/
  47
  48 /**************************************************************
  49  krb5_parse_name that takes a UNIX charset.
  50 **************************************************************/
  51
  52  krb5_error_code smb_krb5_parse_name(krb5_context context,
  53                                 const char *name, /* in unix charset */
  54                                 krb5_principal *principal)
  55 {
  56         krb5_error_code ret;
  57         char *utf8_name;
  58         size_t converted_size;
  59
  60         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  61                 return ENOMEM;
  62         }
  63
  64         ret = krb5_parse_name(context, utf8_name, principal);
  65         TALLOC_FREE(utf8_name);
  66         return ret;
  67 }
  68
  69 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
  70 /**************************************************************
  71  krb5_parse_name_norealm that takes a UNIX charset.
  72 **************************************************************/
  73
  74 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
  75                                 const char *name, /* in unix charset */
  76                                 krb5_principal *principal)
  77 {
  78         krb5_error_code ret;
  79         char *utf8_name;
  80         size_t converted_size;
  81
  82         *principal = NULL;
  83         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  84                 return ENOMEM;
  85         }
  86
  87         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  88         TALLOC_FREE(utf8_name);
  89         return ret;
  90 }
  91 #endif
  92
  93 /**************************************************************
  94  krb5_parse_name that returns a UNIX charset name. Must
  95  be freed with talloc_free() call.
  96 **************************************************************/
  97
  98 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
  99                                       krb5_context context,
 100                                       krb5_const_principal principal,
 101                                       char **unix_name)
 102 {
 103         krb5_error_code ret;
 104         char *utf8_name;
 105         size_t converted_size;
 106
 107         *unix_name = NULL;
 108         ret = krb5_unparse_name(context, principal, &utf8_name);
 109         if (ret) {
 110                 return ret;
 111         }
 112
 113         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 114                 krb5_free_unparsed_name(context, utf8_name);
 115                 return ENOMEM;
 116         }
 117         krb5_free_unparsed_name(context, utf8_name);
 118         return 0;
 119 }
 120
 121 #ifndef HAVE_KRB5_SET_REAL_TIME
 122 /*
 123  * This function is not in the Heimdal mainline.
 124  */
 125  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 126 {
 127         krb5_error_code ret;
 128         int32_t sec, usec;
 129
 130         ret = krb5_us_timeofday(context, &sec, &usec);
 131         if (ret)
 132                 return ret;
 133
 134         context->kdc_sec_offset = seconds - sec;
 135         context->kdc_usec_offset = microseconds - usec;
 136
 137         return 0;
 138 }
 139 #endif
 140
 141 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 142
 143 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 144
 145 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 146  * to krb5_set_default_tgs_ktypes. See
 147  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 148  *
 149  * If the MIT libraries are not exporting internal symbols, we will end up in
 150  * this branch, which is correct. Otherwise we will continue to use the
 151  * internal symbol
 152  */
 153  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 154 {
 155     return krb5_set_default_tgs_enctypes(ctx, enc);
 156 }
 157
 158 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 159
 160 /* Heimdal */
 161  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 162 {
 163         return krb5_set_default_in_tkt_etypes(ctx, enc);
 164 }
 165
 166 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 167
 168 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 169
 170 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 171 /* HEIMDAL */
 172  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 173 {
 174         memset(pkaddr, '\0', sizeof(krb5_address));
 175 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 176         if (paddr->ss_family == AF_INET6) {
 177                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 178                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 179                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 180                 return true;
 181         }
 182 #endif
 183         if (paddr->ss_family == AF_INET) {
 184                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 185                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 186                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 187                 return true;
 188         }
 189         return false;
 190 }
 191 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 192 /* MIT */
 193  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 194 {
 195         memset(pkaddr, '\0', sizeof(krb5_address));
 196 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 197         if (paddr->ss_family == AF_INET6) {
 198                 pkaddr->addrtype = ADDRTYPE_INET6;
 199                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 200                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 201                 return true;
 202         }
 203 #endif
 204         if (paddr->ss_family == AF_INET) {
 205                 pkaddr->addrtype = ADDRTYPE_INET;
 206                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 207                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 208                 return true;
 209         }
 210         return false;
 211 }
 212 #else
 213 #error UNKNOWN_ADDRTYPE
 214 #endif
 215
 216 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 217 static int create_kerberos_key_from_string_direct(krb5_context context,
 218                                                   krb5_principal host_princ,
 219                                                   krb5_data *password,
 220                                                   krb5_keyblock *key,
 221                                                   krb5_enctype enctype)
 222 {
 223         int ret = 0;
 224         krb5_data salt;
 225         krb5_encrypt_block eblock;
 226
 227         ret = krb5_principal2salt(context, host_princ, &salt);
 228         if (ret) {
 229                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 230                 return ret;
 231         }
 232         krb5_use_enctype(context, &eblock, enctype);
 233         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 234         SAFE_FREE(salt.data);
 235
 236         return ret;
 237 }
 238 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 239 static int create_kerberos_key_from_string_direct(krb5_context context,
 240                                                   krb5_principal host_princ,
 241                                                   krb5_data *password,
 242                                                   krb5_keyblock *key,
 243                                                   krb5_enctype enctype)
 244 {
 245         int ret;
 246         krb5_salt salt;
 247
 248         ret = krb5_get_pw_salt(context, host_princ, &salt);
 249         if (ret) {
 250                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 251                 return ret;
 252         }
 253
 254         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 255         krb5_free_salt(context, salt);
 256
 257         return ret;
 258 }
 259 #else
 260 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 261 #endif
 262
 263  int create_kerberos_key_from_string(krb5_context context,
 264                                         krb5_principal host_princ,
 265                                         krb5_data *password,
 266                                         krb5_keyblock *key,
 267                                         krb5_enctype enctype,
 268                                         bool no_salt)
 269 {
 270         krb5_principal salt_princ = NULL;
 271         int ret;
 272         /*
 273          * Check if we've determined that the KDC is salting keys for this
 274          * principal/enctype in a non-obvious way.  If it is, try to match
 275          * its behavior.
 276          */
 277         if (no_salt) {
 278                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 279                 if (!KRB5_KEY_DATA(key)) {
 280                         return ENOMEM;
 281                 }
 282                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 283                 KRB5_KEY_LENGTH(key) = password->length;
 284                 KRB5_KEY_TYPE(key) = enctype;
 285                 return 0;
 286         }
 287         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 288         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 289         if (salt_princ) {
 290                 krb5_free_principal(context, salt_princ);
 291         }
 292         return ret;
 293 }
 294
 295 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 296  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 297                                             krb5_enctype **enctypes)
 298 {
 299         return krb5_get_permitted_enctypes(context, enctypes);
 300 }
 301 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 302  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 303                                             krb5_enctype **enctypes)
 304 {
 305         return krb5_get_default_in_tkt_etypes(context, enctypes);
 306 }
 307 #else
 308 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 309 #endif
 310
 311 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 312  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 313                                         krb5_auth_context auth_context,
 314                                         krb5_keyblock *keyblock)
 315 {
 316         return krb5_auth_con_setkey(context, auth_context, keyblock);
 317 }
 318 #endif
 319
 320 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 321                            DATA_BLOB *edata,
 322                            DATA_BLOB *edata_out)
 323 {
 324         DATA_BLOB edata_contents;
 325         ASN1_DATA *data;
 326         int edata_type;
 327
 328         if (!edata->length) {
 329                 return False;
 330         }
 331
 332         data = asn1_init(mem_ctx);
 333         if (data == NULL) {
 334                 return false;
 335         }
 336
 337         asn1_load(data, *edata);
 338         asn1_start_tag(data, ASN1_SEQUENCE(0));
 339         asn1_start_tag(data, ASN1_CONTEXT(1));
 340         asn1_read_Integer(data, &edata_type);
 341
 342         if (edata_type != KRB5_PADATA_PW_SALT) {
 343                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 344                         KRB5_PADATA_PW_SALT, edata_type));
 345                 asn1_free(data);
 346                 return False;
 347         }
 348
 349         asn1_start_tag(data, ASN1_CONTEXT(2));
 350         asn1_read_OctetString(data, talloc_autofree_context(), &edata_contents);
 351         asn1_end_tag(data);
 352         asn1_end_tag(data);
 353         asn1_end_tag(data);
 354         asn1_free(data);
 355
 356         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 357
 358         data_blob_free(&edata_contents);
 359
 360         return True;
 361 }
 362
 363
 364 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 365 {
 366         DATA_BLOB pac_contents;
 367         ASN1_DATA *data;
 368         int data_type;
 369
 370         if (!auth_data->length) {
 371                 return False;
 372         }
 373
 374         data = asn1_init(mem_ctx);
 375         if (data == NULL) {
 376                 return false;
 377         }
 378
 379         asn1_load(data, *auth_data);
 380         asn1_start_tag(data, ASN1_SEQUENCE(0));
 381         asn1_start_tag(data, ASN1_SEQUENCE(0));
 382         asn1_start_tag(data, ASN1_CONTEXT(0));
 383         asn1_read_Integer(data, &data_type);
 384
 385         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 386                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 387                 asn1_free(data);
 388                 return False;
 389         }
 390
 391         asn1_end_tag(data);
 392         asn1_start_tag(data, ASN1_CONTEXT(1));
 393         asn1_read_OctetString(data, talloc_autofree_context(), &pac_contents);
 394         asn1_end_tag(data);
 395         asn1_end_tag(data);
 396         asn1_end_tag(data);
 397         asn1_free(data);
 398
 399         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 400
 401         data_blob_free(&pac_contents);
 402
 403         return True;
 404 }
 405
 406  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 407 {
 408         DATA_BLOB auth_data_wrapped;
 409         bool got_auth_data_pac = False;
 410         int i;
 411
 412 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 413         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 414             tkt->enc_part2->authorization_data[0] &&
 415             tkt->enc_part2->authorization_data[0]->length)
 416         {
 417                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 418
 419                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 420                             KRB5_AUTHDATA_IF_RELEVANT) {
 421                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 422                                         tkt->enc_part2->authorization_data[i]->ad_type));
 423                                 continue;
 424                         }
 425
 426                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 427                                                       tkt->enc_part2->authorization_data[i]->length);
 428
 429                         /* check if it is a PAC */
 430                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 431                         data_blob_free(&auth_data_wrapped);
 432
 433                         if (got_auth_data_pac) {
 434                                 return true;
 435                         }
 436                 }
 437
 438                 return got_auth_data_pac;
 439         }
 440
 441 #else
 442         if (tkt->ticket.authorization_data &&
 443             tkt->ticket.authorization_data->len)
 444         {
 445                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 446
 447                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 448                             KRB5_AUTHDATA_IF_RELEVANT) {
 449                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 450                                         tkt->ticket.authorization_data->val[i].ad_type));
 451                                 continue;
 452                         }
 453
 454                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 455                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 456
 457                         /* check if it is a PAC */
 458                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 459                         data_blob_free(&auth_data_wrapped);
 460
 461                         if (got_auth_data_pac) {
 462                                 return true;
 463                         }
 464                 }
 465
 466                 return got_auth_data_pac;
 467         }
 468 #endif
 469         return False;
 470 }
 471
 472  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 473 {
 474 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 475         return tkt->enc_part2->client;
 476 #else
 477         return tkt->client;
 478 #endif
 479 }
 480
 481 #if !defined(HAVE_KRB5_LOCATE_KDC)
 482
 483 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 484  * to a public interface for this functionality, so we have to be able to live
 485  * without it if the MIT libraries are hiding their internal symbols.
 486  */
 487
 488 #if defined(KRB5_KRBHST_INIT)
 489 /* Heimdal */
 490  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 491 {
 492         krb5_krbhst_handle hnd;
 493         krb5_krbhst_info *hinfo;
 494         krb5_error_code rc;
 495         int num_kdcs, i;
 496         struct sockaddr *sa;
 497         struct addrinfo *ai;
 498
 499         *addr_pp = NULL;
 500         *naddrs = 0;
 501
 502         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 503         if (rc) {
 504                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 505                 return rc;
 506         }
 507
 508         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 509                 ;
 510
 511         krb5_krbhst_reset(ctx, hnd);
 512
 513         if (!num_kdcs) {
 514                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 515                 krb5_krbhst_free(ctx, hnd);
 516                 return -1;
 517         }
 518
 519         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 520         if (!sa) {
 521                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 522                 krb5_krbhst_free(ctx, hnd);
 523                 naddrs = 0;
 524                 return -1;
 525         }
 526
 527         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 528
 529         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 530
 531 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 532                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 533                 if (rc) {
 534                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 535                         continue;
 536                 }
 537 #endif
 538                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 539                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 540         }
 541
 542         krb5_krbhst_free(ctx, hnd);
 543
 544         *naddrs = num_kdcs;
 545         *addr_pp = sa;
 546         return 0;
 547 }
 548
 549 #else /* ! defined(KRB5_KRBHST_INIT) */
 550
 551  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 552                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 553 {
 554         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 555         return KRB5_KDC_UNREACH;
 556 }
 557
 558 #endif /* KRB5_KRBHST_INIT */
 559
 560 #else /* ! HAVE_KRB5_LOCATE_KDC */
 561
 562  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 563                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 564 {
 565         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 566 }
 567
 568 #endif /* HAVE_KRB5_LOCATE_KDC */
 569
 570 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 571  void krb5_free_unparsed_name(krb5_context context, char *val)
 572 {
 573         SAFE_FREE(val);
 574 }
 575 #endif
 576
 577  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 578 {
 579 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 580         if (pdata->data) {
 581                 krb5_free_data_contents(context, pdata);
 582         }
 583 #else
 584         SAFE_FREE(pdata->data);
 585 #endif
 586 }
 587
 588  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 589 {
 590 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 591         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 592 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 593         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 594 #else
 595 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 596 #endif
 597 }
 598
 599  bool kerberos_compatible_enctypes(krb5_context context,
 600                                   krb5_enctype enctype1,
 601                                   krb5_enctype enctype2)
 602 {
 603 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 604         krb5_boolean similar = 0;
 605
 606         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 607         return similar ? True : False;
 608 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 609         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 610 #endif
 611 }
 612
 613 static bool ads_cleanup_expired_creds(krb5_context context,
 614                                       krb5_ccache  ccache,
 615                                       krb5_creds  *credsp)
 616 {
 617         krb5_error_code retval;
 618         const char *cc_type = krb5_cc_get_type(context, ccache);
 619
 620         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 621                   cc_type, krb5_cc_get_name(context, ccache),
 622                   http_timestring(talloc_tos(), credsp->times.endtime)));
 623
 624         /* we will probably need new tickets if the current ones
 625            will expire within 10 seconds.
 626         */
 627         if (credsp->times.endtime >= (time(NULL) + 10))
 628                 return False;
 629
 630         /* heimdal won't remove creds from a file ccache, and
 631            perhaps we shouldn't anyway, since internally we
 632            use memory ccaches, and a FILE one probably means that
 633            we're using creds obtained outside of our exectuable
 634         */
 635         if (strequal(cc_type, "FILE")) {
 636                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 637                 return False;
 638         }
 639
 640         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 641         if (retval) {
 642                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 643                           error_message(retval)));
 644                 /* If we have an error in this, we want to display it,
 645                    but continue as though we deleted it */
 646         }
 647         return True;
 648 }
 649
 650 /* Allocate and setup the auth context into the state we need. */
 651
 652 static krb5_error_code setup_auth_context(krb5_context context,
 653                         krb5_auth_context *auth_context)
 654 {
 655         krb5_error_code retval;
 656
 657         retval = krb5_auth_con_init(context, auth_context );
 658         if (retval) {
 659                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 660                         error_message(retval)));
 661                 return retval;
 662         }
 663
 664         /* Ensure this is an addressless ticket. */
 665         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 666         if (retval) {
 667                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 668                         error_message(retval)));
 669         }
 670
 671         return retval;
 672 }
 673
 674 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 675                                                 uint32_t gss_flags)
 676 {
 677         unsigned int orig_length = in_data->length;
 678         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 679         char *gss_cksum = NULL;
 680
 681         if (orig_length) {
 682                 /* Extra length field for delgated ticket. */
 683                 base_cksum_size += 4;
 684         }
 685
 686         if ((unsigned int)base_cksum_size + orig_length <
 687                         (unsigned int)base_cksum_size) {
 688                 return EINVAL;
 689         }
 690
 691         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 692         if (gss_cksum == NULL) {
 693                 return ENOMEM;
 694         }
 695
 696         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 697         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 698
 699         /*
 700          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 701          * This matches the behavior of heimdal and mit.
 702          *
 703          * And it is needed to work against some closed source
 704          * SMB servers.
 705          *
 706          * See bug #7883
 707          */
 708         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 709
 710         SIVAL(gss_cksum, 20, gss_flags);
 711
 712         if (orig_length) {
 713                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 714                 SSVAL(gss_cksum, 26, orig_length);
 715                 /* Copy the kerberos KRB_CRED data */
 716                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 717                 free(in_data->data);
 718                 in_data->data = NULL;
 719                 in_data->length = 0;
 720         }
 721         in_data->data = gss_cksum;
 722         in_data->length = base_cksum_size + orig_length;
 723         return 0;
 724 }
 725
 726 /*
 727   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 728 */
 729 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 730                                        krb5_auth_context *auth_context,
 731                                        const krb5_flags ap_req_options,
 732                                        const char *principal,
 733                                        krb5_ccache ccache,
 734                                        krb5_data *outbuf,
 735                                        time_t *expire_time,
 736                                        const char *impersonate_princ_s)
 737 {
 738         krb5_error_code           retval;
 739         krb5_principal    server;
 740         krb5_principal impersonate_princ = NULL;
 741         krb5_creds              * credsp;
 742         krb5_creds                creds;
 743         krb5_data in_data;
 744         bool creds_ready = False;
 745         int i = 0, maxtries = 3;
 746         uint32_t gss_flags = 0;
 747
 748         ZERO_STRUCT(in_data);
 749
 750         retval = smb_krb5_parse_name(context, principal, &server);
 751         if (retval) {
 752                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 753                 return retval;
 754         }
 755
 756         if (impersonate_princ_s) {
 757                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 758                                              &impersonate_princ);
 759                 if (retval) {
 760                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 761                         goto cleanup_princ;
 762                 }
 763         }
 764
 765         /* obtain ticket & session key */
 766         ZERO_STRUCT(creds);
 767         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 768                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 769                          error_message(retval)));
 770                 goto cleanup_princ;
 771         }
 772
 773         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 774                 /* This can commonly fail on smbd startup with no ticket in the cache.
 775                  * Report at higher level than 1. */
 776                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 777                          error_message(retval)));
 778                 goto cleanup_creds;
 779         }
 780
 781         while (!creds_ready && (i < maxtries)) {
 782
 783                 if ((retval = smb_krb5_get_credentials(context, ccache,
 784                                                        creds.client,
 785                                                        creds.server,
 786                                                        impersonate_princ,
 787                                                        &credsp))) {
 788                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 789                                 principal, error_message(retval)));
 790                         goto cleanup_creds;
 791                 }
 792
 793                 /* cope with ticket being in the future due to clock skew */
 794                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 795                         time_t t = time(NULL);
 796                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 797                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 798                         krb5_set_real_time(context, t + time_offset + 1, 0);
 799                 }
 800
 801                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 802                         creds_ready = True;
 803                 }
 804
 805                 i++;
 806         }
 807
 808         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 809                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 810                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 811                   (unsigned)credsp->times.endtime));
 812
 813         if (expire_time) {
 814                 *expire_time = (time_t)credsp->times.endtime;
 815         }
 816
 817         /* Allocate the auth_context. */
 818         retval = setup_auth_context(context, auth_context);
 819         if (retval) {
 820                 DEBUG(1,("setup_auth_context failed (%s)\n",
 821                         error_message(retval)));
 822                 goto cleanup_creds;
 823         }
 824
 825 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 826         if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 827                 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 828                  as part of the kerberos exchange. */
 829
 830                 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 831
 832                 retval = krb5_auth_con_setuseruserkey(context,
 833                                         *auth_context,
 834                                         &credsp->keyblock );
 835                 if (retval) {
 836                         DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 837                                 error_message(retval)));
 838                         goto cleanup_creds;
 839                 }
 840
 841                 /* Must use a subkey for forwarded tickets. */
 842                 retval = krb5_auth_con_setflags(context,
 843                                 *auth_context,
 844                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 845                 if (retval) {
 846                         DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 847                                 error_message(retval)));
 848                         goto cleanup_creds;
 849                 }
 850
 851                 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 852                                 *auth_context,  /* Authentication context [in] */
 853                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 854                                 credsp->client, /* Client principal for the tgt [in] */
 855                                 credsp->server, /* Server principal for the tgt [in] */
 856                                 ccache,         /* Credential cache to use for storage [in] */
 857                                 1,              /* Turn on for "Forwardable ticket" [in] */
 858                                 &in_data );     /* Resulting response [out] */
 859
 860                 if (retval) {
 861                         DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 862                                    error_message( retval ) ) );
 863
 864                         /*
 865                          * This is not fatal. Delete the *auth_context and continue
 866                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 867                          */
 868
 869                         if (in_data.data) {
 870                                 free( in_data.data );
 871                                 in_data.data = NULL;
 872                                 in_data.length = 0;
 873                         }
 874                         krb5_auth_con_free(context, *auth_context);
 875                         *auth_context = NULL;
 876                         retval = setup_auth_context(context, auth_context);
 877                         if (retval) {
 878                                 DEBUG(1,("setup_auth_context failed (%s)\n",
 879                                         error_message(retval)));
 880                                 goto cleanup_creds;
 881                         }
 882                 } else {
 883                         /* We got a delegated ticket. */
 884                         gss_flags |= GSS_C_DELEG_FLAG;
 885                 }
 886         }
 887
 888         /* Frees and reallocates in_data into a GSS checksum blob. */
 889         retval = create_gss_checksum(&in_data, gss_flags);
 890         if (retval) {
 891                 goto cleanup_data;
 892         }
 893
 894         /* We always want GSS-checksum types. */
 895         retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 896         if (retval) {
 897                 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 898                         error_message(retval)));
 899                 goto cleanup_data;
 900         }
 901 #endif
 902
 903         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 904                                       &in_data, credsp, outbuf);
 905         if (retval) {
 906                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 907                          error_message(retval)));
 908         }
 909
 910 cleanup_data:
 911         if (in_data.data) {
 912                 free( in_data.data );
 913                 in_data.length = 0;
 914         }
 915
 916         krb5_free_creds(context, credsp);
 917
 918 cleanup_creds:
 919         krb5_free_cred_contents(context, &creds);
 920
 921 cleanup_princ:
 922         krb5_free_principal(context, server);
 923         if (impersonate_princ) {
 924                 krb5_free_principal(context, impersonate_princ);
 925         }
 926
 927         return retval;
 928 }
 929
 930 /*
 931   get a kerberos5 ticket for the given service
 932 */
 933 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
 934                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 935                         uint32 extra_ap_opts, const char *ccname,
 936                         time_t *tgs_expire,
 937                         const char *impersonate_princ_s)
 938
 939 {
 940         krb5_error_code retval;
 941         krb5_data packet;
 942         krb5_context context = NULL;
 943         krb5_ccache ccdef = NULL;
 944         krb5_auth_context auth_context = NULL;
 945         krb5_enctype enc_types[] = {
 946 #ifdef ENCTYPE_ARCFOUR_HMAC
 947                 ENCTYPE_ARCFOUR_HMAC,
 948 #endif
 949                 ENCTYPE_DES_CBC_MD5,
 950                 ENCTYPE_DES_CBC_CRC,
 951                 ENCTYPE_NULL};
 952
 953         initialize_krb5_error_table();
 954         retval = krb5_init_context(&context);
 955         if (retval) {
 956                 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
 957                          error_message(retval)));
 958                 goto failed;
 959         }
 960
 961         if (time_offset != 0) {
 962                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 963         }
 964
 965         if ((retval = krb5_cc_resolve(context, ccname ?
 966                         ccname : krb5_cc_default_name(context), &ccdef))) {
 967                 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
 968                          error_message(retval)));
 969                 goto failed;
 970         }
 971
 972         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 973                 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
 974                          error_message(retval)));
 975                 goto failed;
 976         }
 977
 978         if ((retval = ads_krb5_mk_req(context,
 979                                         &auth_context,
 980                                         AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 981                                         principal,
 982                                         ccdef, &packet,
 983                                         tgs_expire,
 984                                         impersonate_princ_s))) {
 985                 goto failed;
 986         }
 987
 988         get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
 989
 990         *ticket = data_blob(packet.data, packet.length);
 991
 992         kerberos_free_data_contents(context, &packet);
 993
 994 failed:
 995
 996         if ( context ) {
 997                 if (ccdef)
 998                         krb5_cc_close(context, ccdef);
 999                 if (auth_context)
1000                         krb5_auth_con_free(context, auth_context);
1001                 krb5_free_context(context);
1002         }
1003
1004         return retval;
1005 }
1006
1007  bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
1008  {
1009         krb5_keyblock *skey = NULL;
1010         krb5_error_code err = 0;
1011         bool ret = false;
1012
1013         if (remote) {
1014                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
1015         } else {
1016                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
1017         }
1018
1019         if (err || skey == NULL) {
1020                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1021                 goto done;
1022         }
1023
1024         DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
1025         *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
1026         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1027
1028         ret = true;
1029
1030  done:
1031         if (skey) {
1032                 krb5_free_keyblock(context, skey);
1033         }
1034
1035         return ret;
1036  }
1037
1038
1039 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
1040  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
1041
1042  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
1043 {
1044         static krb5_data kdata;
1045
1046         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
1047         kdata.length = strlen((const char *)kdata.data);
1048         return &kdata;
1049 }
1050 #endif
1051
1052  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
1053 {
1054 /* Try krb5_free_keytab_entry_contents first, since
1055  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1056  * krb5_kt_free_entry but only has a prototype for the first, while the
1057  * second is considered private.
1058  */
1059 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1060         return krb5_free_keytab_entry_contents(context, kt_entry);
1061 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1062         return krb5_kt_free_entry(context, kt_entry);
1063 #else
1064 #error UNKNOWN_KT_FREE_FUNCTION
1065 #endif
1066 }
1067
1068  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1069                                      struct PAC_SIGNATURE_DATA *sig)
1070 {
1071 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1072         cksum->cksumtype        = (krb5_cksumtype)sig->type;
1073         cksum->checksum.length  = sig->signature.length;
1074         cksum->checksum.data    = sig->signature.data;
1075 #else
1076         cksum->checksum_type    = (krb5_cksumtype)sig->type;
1077         cksum->length           = sig->signature.length;
1078         cksum->contents         = sig->signature.data;
1079 #endif
1080 }
1081
1082  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1083                                           const krb5_keyblock *keyblock,
1084                                          krb5_keyusage usage,
1085                                          krb5_checksum *cksum,
1086                                          uint8 *data,
1087                                          size_t length)
1088 {
1089         krb5_error_code ret;
1090
1091         /* verify the checksum */
1092
1093         /* welcome to the wonderful world of samba's kerberos abstraction layer:
1094          *
1095          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
1096          * -----------------------------------------------------------------------------
1097          * krb5_c_verify_checksum       -                       works           works
1098          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
1099          */
1100
1101 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1102         {
1103                 krb5_boolean checksum_valid = False;
1104                 krb5_data input;
1105
1106                 input.data = (char *)data;
1107                 input.length = length;
1108
1109                 ret = krb5_c_verify_checksum(context,
1110                                              keyblock,
1111                                              usage,
1112                                              &input,
1113                                              cksum,
1114                                              &checksum_valid);
1115                 if (ret) {
1116                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1117                                 error_message(ret)));
1118                         return ret;
1119                 }
1120
1121                 if (!checksum_valid)
1122                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1123         }
1124
1125 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1126
1127         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1128          * without enctype and it ignores any key_usage types - Guenther */
1129
1130         {
1131
1132                 krb5_crypto crypto;
1133                 ret = krb5_crypto_init(context,
1134                                        keyblock,
1135                                        0,
1136                                        &crypto);
1137                 if (ret) {
1138                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1139                                 error_message(ret)));
1140                         return ret;
1141                 }
1142
1143                 ret = krb5_verify_checksum(context,
1144                                            crypto,
1145                                            usage,
1146                                            data,
1147                                            length,
1148                                            cksum);
1149
1150                 krb5_crypto_destroy(context, crypto);
1151         }
1152
1153 #else
1154 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1155 #endif
1156
1157         return ret;
1158 }
1159
1160  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1161 {
1162 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1163         return tkt->enc_part2->times.authtime;
1164 #else
1165         return tkt->ticket.authtime;
1166 #endif
1167 }
1168
1169 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1170 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1171 {
1172 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1173         if (ap_req->ticket->enc_part.kvno)
1174                 return ap_req->ticket->enc_part.kvno;
1175 #else /* Heimdal */
1176         if (ap_req->ticket.enc_part.kvno)
1177                 return *ap_req->ticket.enc_part.kvno;
1178 #endif
1179         return 0;
1180 }
1181
1182 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1183 {
1184 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1185         return ap_req->ticket.enc_part.etype;
1186 #else /* MIT */
1187         return ap_req->ticket->enc_part.enctype;
1188 #endif
1189 }
1190 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1191
1192 static krb5_error_code
1193 get_key_from_keytab(krb5_context context,
1194                     krb5_const_principal server,
1195                     krb5_enctype enctype,
1196                     krb5_kvno kvno,
1197                     krb5_keyblock **out_key)
1198 {
1199         krb5_keytab_entry entry;
1200         krb5_error_code ret;
1201         krb5_keytab keytab;
1202         char *name = NULL;
1203         krb5_keyblock *keyp;
1204
1205         /* We have to open a new keytab handle here, as MIT does
1206            an implicit open/getnext/close on krb5_kt_get_entry. We
1207            may be in the middle of a keytab enumeration when this is
1208            called. JRA. */
1209
1210         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1211         if (ret) {
1212                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1213                 return ret;
1214         }
1215
1216         if ( DEBUGLEVEL >= 10 ) {
1217                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1218                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1219                                 kvno, enctype, name));
1220                         TALLOC_FREE(name);
1221                 }
1222         }
1223
1224         ret = krb5_kt_get_entry(context,
1225                                 keytab,
1226                                 server,
1227                                 kvno,
1228                                 enctype,
1229                                 &entry);
1230
1231         if (ret) {
1232                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1233                 goto out;
1234         }
1235
1236         keyp = KRB5_KT_KEY(&entry);
1237
1238         ret = krb5_copy_keyblock(context, keyp, out_key);
1239         if (ret) {
1240                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1241                 goto out;
1242         }
1243
1244         smb_krb5_kt_free_entry(context, &entry);
1245
1246 out:
1247         krb5_kt_close(context, keytab);
1248         return ret;
1249 }
1250
1251 /* Prototypes */
1252
1253  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1254                                                  const krb5_data *inbuf,
1255                                                  krb5_kvno *kvno,
1256                                                  krb5_enctype *enctype)
1257 {
1258 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1259         {
1260                 krb5_error_code ret;
1261                 krb5_ap_req ap_req;
1262
1263                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1264                 if (ret)
1265                         return ret;
1266
1267                 *kvno = get_kvno_from_ap_req(&ap_req);
1268                 *enctype = get_enctype_from_ap_req(&ap_req);
1269
1270                 free_AP_REQ(&ap_req);
1271                 return 0;
1272         }
1273 #endif
1274
1275         /* Possibly not an appropriate error code. */
1276         return KRB5KDC_ERR_BADOPTION;
1277 }
1278
1279  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1280                                                         krb5_auth_context *auth_context,
1281                                                         const krb5_data *inbuf,
1282                                                         krb5_const_principal server,
1283                                                         krb5_keytab keytab,
1284                                                         krb5_flags *ap_req_options,
1285                                                         krb5_ticket **ticket,
1286                                                         krb5_keyblock **keyblock)
1287 {
1288         krb5_error_code ret;
1289         krb5_kvno kvno;
1290         krb5_enctype enctype;
1291         krb5_keyblock *local_keyblock;
1292
1293         ret = krb5_rd_req(context,
1294                           auth_context,
1295                           inbuf,
1296                           server,
1297                           keytab,
1298                           ap_req_options,
1299                           ticket);
1300         if (ret) {
1301                 return ret;
1302         }
1303
1304 #ifdef KRB5_TICKET_HAS_KEYINFO
1305         enctype = (*ticket)->enc_part.enctype;
1306         kvno = (*ticket)->enc_part.kvno;
1307 #else
1308         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1309         if (ret) {
1310                 return ret;
1311         }
1312 #endif
1313
1314         ret = get_key_from_keytab(context,
1315                                   server,
1316                                   enctype,
1317                                   kvno,
1318                                   &local_keyblock);
1319         if (ret) {
1320                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1321                 goto out;
1322         }
1323
1324 out:
1325         if (ret && local_keyblock != NULL) {
1326                 krb5_free_keyblock(context, local_keyblock);
1327         } else {
1328                 *keyblock = local_keyblock;
1329         }
1330
1331         return ret;
1332 }
1333
1334  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1335                                             const char *name,
1336                                             krb5_principal *principal)
1337 {
1338 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1339         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1340 #endif
1341
1342         /* we are cheating here because parse_name will in fact set the realm.
1343          * We don't care as the only caller of smb_krb5_parse_name_norealm
1344          * ignores the realm anyway when calling
1345          * smb_krb5_principal_compare_any_realm later - Guenther */
1346
1347         return smb_krb5_parse_name(context, name, principal);
1348 }
1349
1350  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1351                                           krb5_const_principal princ1,
1352                                           krb5_const_principal princ2)
1353 {
1354 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1355
1356         return krb5_principal_compare_any_realm(context, princ1, princ2);
1357
1358 /* krb5_princ_size is a macro in MIT */
1359 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1360
1361         int i, len1, len2;
1362         const krb5_data *p1, *p2;
1363
1364         len1 = krb5_princ_size(context, princ1);
1365         len2 = krb5_princ_size(context, princ2);
1366
1367         if (len1 != len2)
1368                 return False;
1369
1370         for (i = 0; i < len1; i++) {
1371
1372                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1373                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1374
1375                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1376                         return False;
1377         }
1378
1379         return True;
1380 #else
1381 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1382 #endif
1383 }
1384
1385  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1386                                        const char *client_string,       /* gd@BER.SUSE.DE */
1387                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1388                                        time_t *expire_time)
1389 {
1390         krb5_error_code ret;
1391         krb5_context context = NULL;
1392         krb5_ccache ccache = NULL;
1393         krb5_principal client = NULL;
1394         krb5_creds creds, creds_in, *creds_out = NULL;
1395
1396         ZERO_STRUCT(creds);
1397         ZERO_STRUCT(creds_in);
1398
1399         initialize_krb5_error_table();
1400         ret = krb5_init_context(&context);
1401         if (ret) {
1402                 goto done;
1403         }
1404
1405         if (!ccache_string) {
1406                 ccache_string = krb5_cc_default_name(context);
1407         }
1408
1409         if (!ccache_string) {
1410                 ret = EINVAL;
1411                 goto done;
1412         }
1413
1414         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1415
1416         /* FIXME: we should not fall back to defaults */
1417         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1418         if (ret) {
1419                 goto done;
1420         }
1421
1422         if (client_string) {
1423                 ret = smb_krb5_parse_name(context, client_string, &client);
1424                 if (ret) {
1425                         goto done;
1426                 }
1427         } else {
1428                 ret = krb5_cc_get_principal(context, ccache, &client);
1429                 if (ret) {
1430                         goto done;
1431                 }
1432         }
1433
1434 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1435         {
1436                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1437                 if (ret) {
1438                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1439                         goto done;
1440                 }
1441         }
1442 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1443         {
1444                 krb5_kdc_flags flags;
1445                 krb5_realm *client_realm = NULL;
1446
1447                 ret = krb5_copy_principal(context, client, &creds_in.client);
1448                 if (ret) {
1449                         goto done;
1450                 }
1451
1452                 if (service_string) {
1453                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1454                         if (ret) {
1455                                 goto done;
1456                         }
1457                 } else {
1458                         /* build tgt service by default */
1459                         client_realm = krb5_princ_realm(context, creds_in.client);
1460                         if (!client_realm) {
1461                                 ret = ENOMEM;
1462                                 goto done;
1463                         }
1464                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1465                         if (ret) {
1466                                 goto done;
1467                         }
1468                 }
1469
1470                 flags.i = 0;
1471                 flags.b.renewable = flags.b.renew = True;
1472
1473                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1474                 if (ret) {
1475                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1476                         goto done;
1477                 }
1478
1479                 creds = *creds_out;
1480         }
1481 #else
1482 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1483 #endif
1484
1485         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1486         ret = krb5_cc_initialize(context, ccache, client);
1487         if (ret) {
1488                 goto done;
1489         }
1490
1491         ret = krb5_cc_store_cred(context, ccache, &creds);
1492
1493         if (expire_time) {
1494                 *expire_time = (time_t) creds.times.endtime;
1495         }
1496
1497 done:
1498         krb5_free_cred_contents(context, &creds_in);
1499
1500         if (creds_out) {
1501                 krb5_free_creds(context, creds_out);
1502         } else {
1503                 krb5_free_cred_contents(context, &creds);
1504         }
1505
1506         if (client) {
1507                 krb5_free_principal(context, client);
1508         }
1509         if (ccache) {
1510                 krb5_cc_close(context, ccache);
1511         }
1512         if (context) {
1513                 krb5_free_context(context);
1514         }
1515
1516         return ret;
1517 }
1518
1519  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1520 {
1521         krb5_error_code ret = 0;
1522         if (addr == NULL) {
1523                 return ret;
1524         }
1525 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1526         krb5_free_addresses(context, addr->addrs);
1527 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1528         ret = krb5_free_addresses(context, addr->addrs);
1529         SAFE_FREE(addr->addrs);
1530 #endif
1531         SAFE_FREE(addr);
1532         addr = NULL;
1533         return ret;
1534 }
1535
1536  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1537 {
1538         krb5_error_code ret = 0;
1539         nstring buf;
1540 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1541         krb5_address **addrs = NULL;
1542 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1543         krb5_addresses *addrs = NULL;
1544 #endif
1545
1546         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1547         if (*kerb_addr == NULL) {
1548                 return ENOMEM;
1549         }
1550
1551         put_name(buf, global_myname(), ' ', 0x20);
1552
1553 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1554         {
1555                 int num_addr = 2;
1556
1557                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1558                 if (addrs == NULL) {
1559                         SAFE_FREE(*kerb_addr);
1560                         return ENOMEM;
1561                 }
1562
1563                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1564
1565                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1566                 if (addrs[0] == NULL) {
1567                         SAFE_FREE(addrs);
1568                         SAFE_FREE(*kerb_addr);
1569                         return ENOMEM;
1570                 }
1571
1572                 addrs[0]->magic = KV5M_ADDRESS;
1573                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1574                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1575                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1576                 if (addrs[0]->contents == NULL) {
1577                         SAFE_FREE(addrs[0]);
1578                         SAFE_FREE(addrs);
1579                         SAFE_FREE(*kerb_addr);
1580                         return ENOMEM;
1581                 }
1582
1583                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1584
1585                 addrs[1] = NULL;
1586         }
1587 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1588         {
1589                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1590                 if (addrs == NULL) {
1591                         SAFE_FREE(*kerb_addr);
1592                         return ENOMEM;
1593                 }
1594
1595                 memset(addrs, 0, sizeof(krb5_addresses));
1596
1597                 addrs->len = 1;
1598                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1599                 if (addrs->val == NULL) {
1600                         SAFE_FREE(addrs);
1601                         SAFE_FREE(kerb_addr);
1602                         return ENOMEM;
1603                 }
1604
1605                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1606                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1607                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1608                 if (addrs->val[0].address.data == NULL) {
1609                         SAFE_FREE(addrs->val);
1610                         SAFE_FREE(addrs);
1611                         SAFE_FREE(*kerb_addr);
1612                         return ENOMEM;
1613                 }
1614
1615                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1616         }
1617 #else
1618 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1619 #endif
1620         (*kerb_addr)->addrs = addrs;
1621
1622         return ret;
1623 }
1624
1625  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1626 {
1627 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1628         krb5_free_error_contents(context, krberror);
1629 #else /* MIT */
1630         krb5_free_error(context, krberror);
1631 #endif
1632 }
1633
1634  krb5_error_code handle_krberror_packet(krb5_context context,
1635                                         krb5_data *packet)
1636 {
1637         krb5_error_code ret;
1638         bool got_error_code = False;
1639
1640         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1641
1642 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1643         {
1644                 krb5_error krberror;
1645
1646                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1647                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1648                                 error_message(ret)));
1649                         return ret;
1650                 }
1651
1652                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1653                         ret = (krb5_error_code) krberror.error_code;
1654                         got_error_code = True;
1655                 }
1656
1657                 smb_krb5_free_error(context, &krberror);
1658         }
1659 #else /* MIT */
1660         {
1661                 krb5_error *krberror;
1662
1663                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1664                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1665                                 error_message(ret)));
1666                         return ret;
1667                 }
1668
1669                 if (krberror->e_data.data == NULL) {
1670 #if defined(ERROR_TABLE_BASE_krb5)
1671                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1672 #else
1673                         ret = (krb5_error_code)krberror->error;
1674 #endif
1675                         got_error_code = True;
1676                 }
1677                 smb_krb5_free_error(context, krberror);
1678         }
1679 #endif
1680         if (got_error_code) {
1681                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1682                         error_message(ret), ret));
1683         }
1684         return ret;
1685 }
1686
1687  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1688                                             krb5_get_init_creds_opt **opt)
1689 {
1690 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1691         /* Heimdal or modern MIT version */
1692         return krb5_get_init_creds_opt_alloc(context, opt);
1693 #else
1694         /* Historical MIT version */
1695         krb5_get_init_creds_opt *my_opt;
1696
1697         *opt = NULL;
1698
1699         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1700                 return ENOMEM;
1701         }
1702
1703         krb5_get_init_creds_opt_init(my_opt);
1704
1705         *opt =  my_opt;
1706         return 0;
1707 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1708 }
1709
1710  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1711                                 krb5_get_init_creds_opt *opt)
1712 {
1713 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1714
1715 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1716         /* Modern MIT or Heimdal version */
1717         krb5_get_init_creds_opt_free(context, opt);
1718 #else
1719         /* Heimdal version */
1720         krb5_get_init_creds_opt_free(opt);
1721 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1722
1723 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1724         /* Historical MIT version */
1725         SAFE_FREE(opt);
1726         opt = NULL;
1727 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1728 }
1729
1730  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1731 {
1732         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1733 }
1734
1735
1736 /* caller needs to free etype_s */
1737  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1738                                             krb5_enctype enctype,
1739                                             char **etype_s)
1740 {
1741 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1742         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1743 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1744         char buf[256];
1745         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1746         if (ret) {
1747                 return ret;
1748         }
1749         *etype_s = SMB_STRDUP(buf);
1750         if (!*etype_s) {
1751                 return ENOMEM;
1752         }
1753         return ret;
1754 #else
1755 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1756 #endif
1757 }
1758
1759  krb5_error_code smb_krb5_mk_error(krb5_context context,
1760                                 krb5_error_code error_code,
1761                                 const krb5_principal server,
1762                                 krb5_data *reply)
1763 {
1764 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1765         /*
1766          * The MIT interface is *terrible*.
1767          * We have to construct this ourselves...
1768          */
1769         krb5_error e;
1770
1771         memset(&e, 0, sizeof(e));
1772         krb5_us_timeofday(context, &e.stime, &e.susec);
1773         e.server = server;
1774 #if defined(krb5_err_base)
1775         e.error = error_code - krb5_err_base;
1776 #elif defined(ERROR_TABLE_BASE_krb5)
1777         e.error = error_code - ERROR_TABLE_BASE_krb5;
1778 #else
1779         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1780 #endif
1781
1782         return krb5_mk_error(context, &e, reply);
1783 #else /* Heimdal. */
1784         return krb5_mk_error(context,
1785                                 error_code,
1786                                 NULL,
1787                                 NULL, /* e_data */
1788                                 NULL,
1789                                 server,
1790                                 NULL,
1791                                 NULL,
1792                                 reply);
1793 #endif
1794 }
1795
1796 /**********************************************************************
1797  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1798  * allows to process non-default keytab names.
1799  * @param context krb5_context
1800  * @param keytab_name_req string
1801  * @param write_access bool if writable keytab is required
1802  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1803  * @return krb5_error_code
1804 **********************************************************************/
1805
1806 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1807 #ifndef MAX_KEYTAB_NAME_LEN
1808 #define MAX_KEYTAB_NAME_LEN 1100
1809 #endif
1810
1811  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1812                                       const char *keytab_name_req,
1813                                       bool write_access,
1814                                       krb5_keytab *keytab)
1815 {
1816         krb5_error_code ret = 0;
1817         TALLOC_CTX *mem_ctx;
1818         char keytab_string[MAX_KEYTAB_NAME_LEN];
1819         char *kt_str = NULL;
1820         bool found_valid_name = False;
1821         const char *pragma = "FILE";
1822         const char *tmp = NULL;
1823
1824         if (!write_access && !keytab_name_req) {
1825                 /* caller just wants to read the default keytab readonly, so be it */
1826                 return krb5_kt_default(context, keytab);
1827         }
1828
1829         mem_ctx = talloc_init("smb_krb5_open_keytab");
1830         if (!mem_ctx) {
1831                 return ENOMEM;
1832         }
1833
1834 #ifdef HAVE_WRFILE_KEYTAB
1835         if (write_access) {
1836                 pragma = "WRFILE";
1837         }
1838 #endif
1839
1840         if (keytab_name_req) {
1841
1842                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1843                         ret = KRB5_CONFIG_NOTENUFSPACE;
1844                         goto out;
1845                 }
1846
1847                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1848                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1849                         tmp = keytab_name_req;
1850                         goto resolve;
1851                 }
1852
1853                 if (keytab_name_req[0] != '/') {
1854                         ret = KRB5_KT_BADNAME;
1855                         goto out;
1856                 }
1857
1858                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1859                 if (!tmp) {
1860                         ret = ENOMEM;
1861                         goto out;
1862                 }
1863
1864                 goto resolve;
1865         }
1866
1867         /* we need to handle more complex keytab_strings, like:
1868          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1869
1870         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1871         if (ret) {
1872                 goto out;
1873         }
1874
1875         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1876
1877         tmp = talloc_strdup(mem_ctx, keytab_string);
1878         if (!tmp) {
1879                 ret = ENOMEM;
1880                 goto out;
1881         }
1882
1883         if (strncmp(tmp, "ANY:", 4) == 0) {
1884                 tmp += 4;
1885         }
1886
1887         memset(&keytab_string, '\0', sizeof(keytab_string));
1888
1889         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1890                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1891                         found_valid_name = True;
1892                         tmp = kt_str;
1893                         tmp += 7;
1894                 }
1895
1896                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1897                         found_valid_name = True;
1898                         tmp = kt_str;
1899                         tmp += 5;
1900                 }
1901
1902                 if (tmp[0] == '/') {
1903                         /* Treat as a FILE: keytab definition. */
1904                         found_valid_name = true;
1905                 }
1906
1907                 if (found_valid_name) {
1908                         if (tmp[0] != '/') {
1909                                 ret = KRB5_KT_BADNAME;
1910                                 goto out;
1911                         }
1912
1913                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1914                         if (!tmp) {
1915                                 ret = ENOMEM;
1916                                 goto out;
1917                         }
1918                         break;
1919                 }
1920         }
1921
1922         if (!found_valid_name) {
1923                 ret = KRB5_KT_UNKNOWN_TYPE;
1924                 goto out;
1925         }
1926
1927  resolve:
1928         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1929         ret = krb5_kt_resolve(context, tmp, keytab);
1930
1931  out:
1932         TALLOC_FREE(mem_ctx);
1933         return ret;
1934 }
1935
1936 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1937                                      krb5_context context,
1938                                      krb5_keytab keytab,
1939                                      const char **keytab_name)
1940 {
1941         char keytab_string[MAX_KEYTAB_NAME_LEN];
1942         krb5_error_code ret = 0;
1943
1944         ret = krb5_kt_get_name(context, keytab,
1945                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1946         if (ret) {
1947                 return ret;
1948         }
1949
1950         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1951         if (!*keytab_name) {
1952                 return ENOMEM;
1953         }
1954
1955         return ret;
1956 }
1957
1958 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1959     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1960     defined(HAVE_KRB5_GET_CREDS)
1961 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1962                                                              krb5_ccache ccache,
1963                                                              krb5_principal me,
1964                                                              krb5_principal server,
1965                                                              krb5_principal impersonate_princ,
1966                                                              krb5_creds **out_creds)
1967 {
1968         krb5_error_code ret;
1969         krb5_get_creds_opt opt;
1970
1971         ret = krb5_get_creds_opt_alloc(context, &opt);
1972         if (ret) {
1973                 goto done;
1974         }
1975         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1976
1977         if (impersonate_princ) {
1978                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1979                                                          impersonate_princ);
1980                 if (ret) {
1981                         goto done;
1982                 }
1983         }
1984
1985         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1986         if (ret) {
1987                 goto done;
1988         }
1989
1990  done:
1991         if (opt) {
1992                 krb5_get_creds_opt_free(context, opt);
1993         }
1994         return ret;
1995 }
1996 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1997
1998 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1999 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2000                                                          krb5_ccache ccache,
2001                                                          krb5_principal me,
2002                                                          krb5_principal server,
2003                                                          krb5_principal impersonate_princ,
2004                                                          krb5_creds **out_creds)
2005 {
2006         krb5_error_code ret;
2007         krb5_creds in_creds;
2008
2009 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2010 krb5_error_code KRB5_CALLCONV
2011 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2012                               krb5_ccache ccache, krb5_creds *in_creds,
2013                               krb5_data *subject_cert,
2014                               krb5_creds **out_creds);
2015 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2016
2017         ZERO_STRUCT(in_creds);
2018
2019         if (impersonate_princ) {
2020
2021                 in_creds.server = me;
2022                 in_creds.client = impersonate_princ;
2023
2024                 ret = krb5_get_credentials_for_user(context,
2025                                                     0, /* krb5_flags options */
2026                                                     ccache,
2027                                                     &in_creds,
2028                                                     NULL, /* krb5_data *subject_cert */
2029                                                     out_creds);
2030         } else {
2031                 in_creds.client = me;
2032                 in_creds.server = server;
2033
2034                 ret = krb5_get_credentials(context, 0, ccache,
2035                                            &in_creds, out_creds);
2036         }
2037
2038         return ret;
2039 }
2040 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2041
2042 /*
2043  * smb_krb5_get_credentials
2044  *
2045  * @brief Get krb5 credentials for a server
2046  *
2047  * @param[in] context           An initialized krb5_context
2048  * @param[in] ccache            An initialized krb5_ccache
2049  * @param[in] me                The krb5_principal of the caller
2050  * @param[in] server            The krb5_principal of the requested service
2051  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2052  * @param[out] out_creds        The returned krb5_creds structure
2053  * @return krb5_error_code
2054  *
2055  */
2056 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2057                                          krb5_ccache ccache,
2058                                          krb5_principal me,
2059                                          krb5_principal server,
2060                                          krb5_principal impersonate_princ,
2061                                          krb5_creds **out_creds)
2062 {
2063         krb5_error_code ret;
2064         krb5_creds *creds = NULL;
2065
2066         *out_creds = NULL;
2067
2068         if (impersonate_princ) {
2069 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2070                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2071 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2072                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2073 #else
2074                 ret = ENOTSUP;
2075 #endif
2076         } else {
2077                 krb5_creds in_creds;
2078
2079                 ZERO_STRUCT(in_creds);
2080
2081                 in_creds.client = me;
2082                 in_creds.server = server;
2083
2084                 ret = krb5_get_credentials(context, 0, ccache,
2085                                            &in_creds, &creds);
2086         }
2087         if (ret) {
2088                 goto done;
2089         }
2090
2091         if (out_creds) {
2092                 *out_creds = creds;
2093         }
2094
2095  done:
2096         if (creds && ret) {
2097                 krb5_free_creds(context, creds);
2098         }
2099
2100         return ret;
2101 }
2102
2103 /*
2104  * smb_krb5_get_creds
2105  *
2106  * @brief Get krb5 credentials for a server
2107  *
2108  * @param[in] server_s          The string name of the service
2109  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2110  * @param[in] cc                The krb5 credential cache string name (optional)
2111  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2112  * @param[out] creds_p          The returned krb5_creds structure
2113  * @return krb5_error_code
2114  *
2115  */
2116 krb5_error_code smb_krb5_get_creds(const char *server_s,
2117                                    time_t time_offset,
2118                                    const char *cc,
2119                                    const char *impersonate_princ_s,
2120                                    krb5_creds **creds_p)
2121 {
2122         krb5_error_code ret;
2123         krb5_context context = NULL;
2124         krb5_principal me = NULL;
2125         krb5_principal server = NULL;
2126         krb5_principal impersonate_princ = NULL;
2127         krb5_creds *creds = NULL;
2128         krb5_ccache ccache = NULL;
2129
2130         *creds_p = NULL;
2131
2132         initialize_krb5_error_table();
2133         ret = krb5_init_context(&context);
2134         if (ret) {
2135                 goto done;
2136         }
2137
2138         if (time_offset != 0) {
2139                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2140         }
2141
2142         ret = krb5_cc_resolve(context, cc ? cc :
2143                 krb5_cc_default_name(context), &ccache);
2144         if (ret) {
2145                 goto done;
2146         }
2147
2148         ret = krb5_cc_get_principal(context, ccache, &me);
2149         if (ret) {
2150                 goto done;
2151         }
2152
2153         ret = smb_krb5_parse_name(context, server_s, &server);
2154         if (ret) {
2155                 goto done;
2156         }
2157
2158         if (impersonate_princ_s) {
2159                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2160                                           &impersonate_princ);
2161                 if (ret) {
2162                         goto done;
2163                 }
2164         }
2165
2166         ret = smb_krb5_get_credentials(context, ccache,
2167                                        me, server, impersonate_princ,
2168                                        &creds);
2169         if (ret) {
2170                 goto done;
2171         }
2172
2173         ret = krb5_cc_store_cred(context, ccache, creds);
2174         if (ret) {
2175                 goto done;
2176         }
2177
2178         if (creds_p) {
2179                 *creds_p = creds;
2180         }
2181
2182         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2183                 server_s));
2184
2185         if (impersonate_princ_s) {
2186                 char *client = NULL;
2187
2188                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2189                 if (ret) {
2190                         goto done;
2191                 }
2192                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2193                         client));
2194                 TALLOC_FREE(client);
2195         }
2196
2197  done:
2198         if (!context) {
2199                 return ret;
2200         }
2201
2202         if (creds && ret) {
2203                 krb5_free_creds(context, creds);
2204         }
2205         if (server) {
2206                 krb5_free_principal(context, server);
2207         }
2208         if (me) {
2209                 krb5_free_principal(context, me);
2210         }
2211         if (impersonate_princ) {
2212                 krb5_free_principal(context, impersonate_princ);
2213         }
2214         if (ccache) {
2215                 krb5_cc_close(context, ccache);
2216         }
2217         krb5_free_context(context);
2218
2219         return ret;
2220 }
2221
2222 /*
2223  * smb_krb5_principal_get_realm
2224  *
2225  * @brief Get realm of a principal
2226  *
2227  * @param[in] context           The krb5_context
2228  * @param[in] principal         The principal
2229  * @return pointer to the realm
2230  *
2231  */
2232
2233 char *smb_krb5_principal_get_realm(krb5_context context,
2234                                    krb5_principal principal)
2235 {
2236 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2237         return krb5_principal_get_realm(context, principal);
2238 #elif defined(krb5_princ_realm) /* MIT */
2239         krb5_data *realm;
2240         realm = krb5_princ_realm(context, principal);
2241         return (char *)realm->data;
2242 #else
2243         return NULL;
2244 #endif
2245 }
2246
2247 #else /* HAVE_KRB5 */
2248  /* this saves a few linking headaches */
2249  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
2250                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
2251                         const char *ccname, time_t *tgs_expire,
2252                         const char *impersonate_princ_s)
2253 {
2254          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2255          return 1;
2256 }
2257
2258 #endif