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 #ifndef KRB5_AUTHDATA_WIN2K_PAC
  24 #define KRB5_AUTHDATA_WIN2K_PAC 128
  25 #endif
  26
  27 #ifndef KRB5_AUTHDATA_IF_RELEVANT
  28 #define KRB5_AUTHDATA_IF_RELEVANT 1
  29 #endif
  30
  31 #include "includes.h"
  32 #include "smb_krb5.h"
  33
  34 #ifdef HAVE_KRB5
  35
  36 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  37 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  38 #define GSSAPI_CHECKSUM_SIZE (12+GSSAPI_BNDLENGTH)
  39
  40 #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)
  41 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
  42                                          krb5_auth_context *auth_context,
  43                                          krb5_creds *credsp,
  44                                          krb5_ccache ccache,
  45                                          krb5_data *authenticator);
  46 #endif
  47
  48 /**************************************************************
  49  Wrappers around kerberos string functions that convert from
  50  utf8 -> unix charset and vica versa.
  51 **************************************************************/
  52
  53 /**************************************************************
  54  krb5_parse_name that takes a UNIX charset.
  55 **************************************************************/
  56
  57  krb5_error_code smb_krb5_parse_name(krb5_context context,
  58                                 const char *name, /* in unix charset */
  59                                 krb5_principal *principal)
  60 {
  61         krb5_error_code ret;
  62         char *utf8_name;
  63         size_t converted_size;
  64
  65         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  66                 return ENOMEM;
  67         }
  68
  69         ret = krb5_parse_name(context, utf8_name, principal);
  70         TALLOC_FREE(utf8_name);
  71         return ret;
  72 }
  73
  74 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
  75 /**************************************************************
  76  krb5_parse_name_norealm that takes a UNIX charset.
  77 **************************************************************/
  78
  79 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
  80                                 const char *name, /* in unix charset */
  81                                 krb5_principal *principal)
  82 {
  83         krb5_error_code ret;
  84         char *utf8_name;
  85         size_t converted_size;
  86
  87         *principal = NULL;
  88         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  89                 return ENOMEM;
  90         }
  91
  92         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  93         TALLOC_FREE(utf8_name);
  94         return ret;
  95 }
  96 #endif
  97
  98 /**************************************************************
  99  krb5_parse_name that returns a UNIX charset name. Must
 100  be freed with talloc_free() call.
 101 **************************************************************/
 102
 103 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 104                                       krb5_context context,
 105                                       krb5_const_principal principal,
 106                                       char **unix_name)
 107 {
 108         krb5_error_code ret;
 109         char *utf8_name;
 110         size_t converted_size;
 111
 112         *unix_name = NULL;
 113         ret = krb5_unparse_name(context, principal, &utf8_name);
 114         if (ret) {
 115                 return ret;
 116         }
 117
 118         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 119                 krb5_free_unparsed_name(context, utf8_name);
 120                 return ENOMEM;
 121         }
 122         krb5_free_unparsed_name(context, utf8_name);
 123         return 0;
 124 }
 125
 126 #ifndef HAVE_KRB5_SET_REAL_TIME
 127 /*
 128  * This function is not in the Heimdal mainline.
 129  */
 130  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 131 {
 132         krb5_error_code ret;
 133         int32_t sec, usec;
 134
 135         ret = krb5_us_timeofday(context, &sec, &usec);
 136         if (ret)
 137                 return ret;
 138
 139         context->kdc_sec_offset = seconds - sec;
 140         context->kdc_usec_offset = microseconds - usec;
 141
 142         return 0;
 143 }
 144 #endif
 145
 146 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 147
 148 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 149
 150 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 151  * to krb5_set_default_tgs_ktypes. See
 152  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 153  *
 154  * If the MIT libraries are not exporting internal symbols, we will end up in
 155  * this branch, which is correct. Otherwise we will continue to use the
 156  * internal symbol
 157  */
 158  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 159 {
 160     return krb5_set_default_tgs_enctypes(ctx, enc);
 161 }
 162
 163 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 164
 165 /* Heimdal */
 166  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 167 {
 168         return krb5_set_default_in_tkt_etypes(ctx, enc);
 169 }
 170
 171 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 172
 173 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 174
 175 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 176 /* HEIMDAL */
 177  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 178 {
 179         memset(pkaddr, '\0', sizeof(krb5_address));
 180 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 181         if (paddr->ss_family == AF_INET6) {
 182                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 183                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 184                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 185                 return true;
 186         }
 187 #endif
 188         if (paddr->ss_family == AF_INET) {
 189                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 190                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 191                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 192                 return true;
 193         }
 194         return false;
 195 }
 196 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 197 /* MIT */
 198  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 199 {
 200         memset(pkaddr, '\0', sizeof(krb5_address));
 201 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 202         if (paddr->ss_family == AF_INET6) {
 203                 pkaddr->addrtype = ADDRTYPE_INET6;
 204                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 205                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 206                 return true;
 207         }
 208 #endif
 209         if (paddr->ss_family == AF_INET) {
 210                 pkaddr->addrtype = ADDRTYPE_INET;
 211                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 212                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 213                 return true;
 214         }
 215         return false;
 216 }
 217 #else
 218 #error UNKNOWN_ADDRTYPE
 219 #endif
 220
 221 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 222 static int create_kerberos_key_from_string_direct(krb5_context context,
 223                                                   krb5_principal host_princ,
 224                                                   krb5_data *password,
 225                                                   krb5_keyblock *key,
 226                                                   krb5_enctype enctype)
 227 {
 228         int ret = 0;
 229         krb5_data salt;
 230         krb5_encrypt_block eblock;
 231
 232         ret = krb5_principal2salt(context, host_princ, &salt);
 233         if (ret) {
 234                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 235                 return ret;
 236         }
 237         krb5_use_enctype(context, &eblock, enctype);
 238         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 239         SAFE_FREE(salt.data);
 240
 241         return ret;
 242 }
 243 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 244 static int create_kerberos_key_from_string_direct(krb5_context context,
 245                                                   krb5_principal host_princ,
 246                                                   krb5_data *password,
 247                                                   krb5_keyblock *key,
 248                                                   krb5_enctype enctype)
 249 {
 250         int ret;
 251         krb5_salt salt;
 252
 253         ret = krb5_get_pw_salt(context, host_princ, &salt);
 254         if (ret) {
 255                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 256                 return ret;
 257         }
 258
 259         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 260         krb5_free_salt(context, salt);
 261
 262         return ret;
 263 }
 264 #else
 265 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 266 #endif
 267
 268  int create_kerberos_key_from_string(krb5_context context,
 269                                         krb5_principal host_princ,
 270                                         krb5_data *password,
 271                                         krb5_keyblock *key,
 272                                         krb5_enctype enctype,
 273                                         bool no_salt)
 274 {
 275         krb5_principal salt_princ = NULL;
 276         int ret;
 277         /*
 278          * Check if we've determined that the KDC is salting keys for this
 279          * principal/enctype in a non-obvious way.  If it is, try to match
 280          * its behavior.
 281          */
 282         if (no_salt) {
 283                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 284                 if (!KRB5_KEY_DATA(key)) {
 285                         return ENOMEM;
 286                 }
 287                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 288                 KRB5_KEY_LENGTH(key) = password->length;
 289                 KRB5_KEY_TYPE(key) = enctype;
 290                 return 0;
 291         }
 292         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 293         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 294         if (salt_princ) {
 295                 krb5_free_principal(context, salt_princ);
 296         }
 297         return ret;
 298 }
 299
 300 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 301  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 302                                             krb5_enctype **enctypes)
 303 {
 304         return krb5_get_permitted_enctypes(context, enctypes);
 305 }
 306 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 307  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 308                                             krb5_enctype **enctypes)
 309 {
 310         return krb5_get_default_in_tkt_etypes(context, enctypes);
 311 }
 312 #else
 313 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 314 #endif
 315
 316 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 317  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 318                                         krb5_auth_context auth_context,
 319                                         krb5_keyblock *keyblock)
 320 {
 321         return krb5_auth_con_setkey(context, auth_context, keyblock);
 322 }
 323 #endif
 324
 325 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 326                            DATA_BLOB *edata,
 327                            DATA_BLOB *edata_out)
 328 {
 329         DATA_BLOB edata_contents;
 330         ASN1_DATA *data;
 331         int edata_type;
 332
 333         if (!edata->length) {
 334                 return False;
 335         }
 336
 337         data = asn1_init(mem_ctx);
 338         if (data == NULL) {
 339                 return false;
 340         }
 341
 342         asn1_load(data, *edata);
 343         asn1_start_tag(data, ASN1_SEQUENCE(0));
 344         asn1_start_tag(data, ASN1_CONTEXT(1));
 345         asn1_read_Integer(data, &edata_type);
 346
 347         if (edata_type != KRB5_PADATA_PW_SALT) {
 348                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 349                         KRB5_PADATA_PW_SALT, edata_type));
 350                 asn1_free(data);
 351                 return False;
 352         }
 353
 354         asn1_start_tag(data, ASN1_CONTEXT(2));
 355         asn1_read_OctetString(data, talloc_autofree_context(), &edata_contents);
 356         asn1_end_tag(data);
 357         asn1_end_tag(data);
 358         asn1_end_tag(data);
 359         asn1_free(data);
 360
 361         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 362
 363         data_blob_free(&edata_contents);
 364
 365         return True;
 366 }
 367
 368
 369 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 370 {
 371         DATA_BLOB pac_contents;
 372         ASN1_DATA *data;
 373         int data_type;
 374
 375         if (!auth_data->length) {
 376                 return False;
 377         }
 378
 379         data = asn1_init(mem_ctx);
 380         if (data == NULL) {
 381                 return false;
 382         }
 383
 384         asn1_load(data, *auth_data);
 385         asn1_start_tag(data, ASN1_SEQUENCE(0));
 386         asn1_start_tag(data, ASN1_SEQUENCE(0));
 387         asn1_start_tag(data, ASN1_CONTEXT(0));
 388         asn1_read_Integer(data, &data_type);
 389
 390         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 391                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 392                 asn1_free(data);
 393                 return False;
 394         }
 395
 396         asn1_end_tag(data);
 397         asn1_start_tag(data, ASN1_CONTEXT(1));
 398         asn1_read_OctetString(data, talloc_autofree_context(), &pac_contents);
 399         asn1_end_tag(data);
 400         asn1_end_tag(data);
 401         asn1_end_tag(data);
 402         asn1_free(data);
 403
 404         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 405
 406         data_blob_free(&pac_contents);
 407
 408         return True;
 409 }
 410
 411  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 412 {
 413         DATA_BLOB auth_data_wrapped;
 414         bool got_auth_data_pac = False;
 415         int i;
 416
 417 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 418         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 419             tkt->enc_part2->authorization_data[0] &&
 420             tkt->enc_part2->authorization_data[0]->length)
 421         {
 422                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 423
 424                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 425                             KRB5_AUTHDATA_IF_RELEVANT) {
 426                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 427                                         tkt->enc_part2->authorization_data[i]->ad_type));
 428                                 continue;
 429                         }
 430
 431                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 432                                                       tkt->enc_part2->authorization_data[i]->length);
 433
 434                         /* check if it is a PAC */
 435                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 436                         data_blob_free(&auth_data_wrapped);
 437
 438                         if (got_auth_data_pac) {
 439                                 return true;
 440                         }
 441                 }
 442
 443                 return got_auth_data_pac;
 444         }
 445
 446 #else
 447         if (tkt->ticket.authorization_data &&
 448             tkt->ticket.authorization_data->len)
 449         {
 450                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 451
 452                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 453                             KRB5_AUTHDATA_IF_RELEVANT) {
 454                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 455                                         tkt->ticket.authorization_data->val[i].ad_type));
 456                                 continue;
 457                         }
 458
 459                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 460                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 461
 462                         /* check if it is a PAC */
 463                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 464                         data_blob_free(&auth_data_wrapped);
 465
 466                         if (got_auth_data_pac) {
 467                                 return true;
 468                         }
 469                 }
 470
 471                 return got_auth_data_pac;
 472         }
 473 #endif
 474         return False;
 475 }
 476
 477  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 478 {
 479 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 480         return tkt->enc_part2->client;
 481 #else
 482         return tkt->client;
 483 #endif
 484 }
 485
 486 #if !defined(HAVE_KRB5_LOCATE_KDC)
 487
 488 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 489  * to a public interface for this functionality, so we have to be able to live
 490  * without it if the MIT libraries are hiding their internal symbols.
 491  */
 492
 493 #if defined(KRB5_KRBHST_INIT)
 494 /* Heimdal */
 495  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 496 {
 497         krb5_krbhst_handle hnd;
 498         krb5_krbhst_info *hinfo;
 499         krb5_error_code rc;
 500         int num_kdcs, i;
 501         struct sockaddr *sa;
 502         struct addrinfo *ai;
 503
 504         *addr_pp = NULL;
 505         *naddrs = 0;
 506
 507         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 508         if (rc) {
 509                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 510                 return rc;
 511         }
 512
 513         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 514                 ;
 515
 516         krb5_krbhst_reset(ctx, hnd);
 517
 518         if (!num_kdcs) {
 519                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 520                 krb5_krbhst_free(ctx, hnd);
 521                 return -1;
 522         }
 523
 524         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 525         if (!sa) {
 526                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 527                 krb5_krbhst_free(ctx, hnd);
 528                 naddrs = 0;
 529                 return -1;
 530         }
 531
 532         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 533
 534         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 535
 536 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 537                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 538                 if (rc) {
 539                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 540                         continue;
 541                 }
 542 #endif
 543                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 544                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 545         }
 546
 547         krb5_krbhst_free(ctx, hnd);
 548
 549         *naddrs = num_kdcs;
 550         *addr_pp = sa;
 551         return 0;
 552 }
 553
 554 #else /* ! defined(KRB5_KRBHST_INIT) */
 555
 556  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 557                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 558 {
 559         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 560         return KRB5_KDC_UNREACH;
 561 }
 562
 563 #endif /* KRB5_KRBHST_INIT */
 564
 565 #else /* ! HAVE_KRB5_LOCATE_KDC */
 566
 567  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 568                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 569 {
 570         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 571 }
 572
 573 #endif /* HAVE_KRB5_LOCATE_KDC */
 574
 575 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 576  void krb5_free_unparsed_name(krb5_context context, char *val)
 577 {
 578         SAFE_FREE(val);
 579 }
 580 #endif
 581
 582  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 583 {
 584 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 585         if (pdata->data) {
 586                 krb5_free_data_contents(context, pdata);
 587         }
 588 #else
 589         SAFE_FREE(pdata->data);
 590 #endif
 591 }
 592
 593  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 594 {
 595 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 596         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 597 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 598         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 599 #else
 600 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 601 #endif
 602 }
 603
 604  bool kerberos_compatible_enctypes(krb5_context context,
 605                                   krb5_enctype enctype1,
 606                                   krb5_enctype enctype2)
 607 {
 608 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 609         krb5_boolean similar = 0;
 610
 611         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 612         return similar ? True : False;
 613 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 614         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 615 #endif
 616 }
 617
 618 static bool ads_cleanup_expired_creds(krb5_context context,
 619                                       krb5_ccache  ccache,
 620                                       krb5_creds  *credsp)
 621 {
 622         krb5_error_code retval;
 623         const char *cc_type = krb5_cc_get_type(context, ccache);
 624
 625         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 626                   cc_type, krb5_cc_get_name(context, ccache),
 627                   http_timestring(talloc_tos(), credsp->times.endtime)));
 628
 629         /* we will probably need new tickets if the current ones
 630            will expire within 10 seconds.
 631         */
 632         if (credsp->times.endtime >= (time(NULL) + 10))
 633                 return False;
 634
 635         /* heimdal won't remove creds from a file ccache, and
 636            perhaps we shouldn't anyway, since internally we
 637            use memory ccaches, and a FILE one probably means that
 638            we're using creds obtained outside of our exectuable
 639         */
 640         if (strequal(cc_type, "FILE")) {
 641                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 642                 return False;
 643         }
 644
 645         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 646         if (retval) {
 647                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 648                           error_message(retval)));
 649                 /* If we have an error in this, we want to display it,
 650                    but continue as though we deleted it */
 651         }
 652         return True;
 653 }
 654
 655 /*
 656   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 657 */
 658 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 659                                        krb5_auth_context *auth_context,
 660                                        const krb5_flags ap_req_options,
 661                                        const char *principal,
 662                                        krb5_ccache ccache,
 663                                        krb5_data *outbuf,
 664                                        time_t *expire_time,
 665                                        const char *impersonate_princ_s)
 666 {
 667         krb5_error_code           retval;
 668         krb5_principal    server;
 669         krb5_principal impersonate_princ = NULL;
 670         krb5_creds              * credsp;
 671         krb5_creds                creds;
 672         krb5_data in_data;
 673         bool creds_ready = False;
 674         int i = 0, maxtries = 3;
 675
 676         ZERO_STRUCT(in_data);
 677
 678         retval = smb_krb5_parse_name(context, principal, &server);
 679         if (retval) {
 680                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 681                 return retval;
 682         }
 683
 684         if (impersonate_princ_s) {
 685                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 686                                              &impersonate_princ);
 687                 if (retval) {
 688                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 689                         goto cleanup_princ;
 690                 }
 691         }
 692
 693         /* obtain ticket & session key */
 694         ZERO_STRUCT(creds);
 695         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 696                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 697                          error_message(retval)));
 698                 goto cleanup_princ;
 699         }
 700
 701         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 702                 /* This can commonly fail on smbd startup with no ticket in the cache.
 703                  * Report at higher level than 1. */
 704                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 705                          error_message(retval)));
 706                 goto cleanup_creds;
 707         }
 708
 709         while (!creds_ready && (i < maxtries)) {
 710
 711                 if ((retval = smb_krb5_get_credentials(context, ccache,
 712                                                        creds.client,
 713                                                        creds.server,
 714                                                        impersonate_princ,
 715                                                        &credsp))) {
 716                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 717                                 principal, error_message(retval)));
 718                         goto cleanup_creds;
 719                 }
 720
 721                 /* cope with ticket being in the future due to clock skew */
 722                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 723                         time_t t = time(NULL);
 724                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 725                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 726                         krb5_set_real_time(context, t + time_offset + 1, 0);
 727                 }
 728
 729                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 730                         creds_ready = True;
 731                 }
 732
 733                 i++;
 734         }
 735
 736         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 737                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 738                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 739                   (unsigned)credsp->times.endtime));
 740
 741         if (expire_time) {
 742                 *expire_time = (time_t)credsp->times.endtime;
 743         }
 744
 745 #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)
 746         if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 747                 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 748                  as part of the kerberos exchange. */
 749
 750                 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 751
 752                 if( *auth_context == NULL ) {
 753                         /* Allocate if it has not yet been allocated. */
 754                         retval = krb5_auth_con_init( context, auth_context );
 755                         if (retval) {
 756                                 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n",
 757                                         error_message(retval)));
 758                                 goto cleanup_creds;
 759                         }
 760                 }
 761
 762                 retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock );
 763                 if (retval) {
 764                         DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setuseruserkey failed (%s)\n",
 765                                 error_message(retval)));
 766                         goto cleanup_creds;
 767                 }
 768
 769                 /* Must use a subkey for forwarded tickets. */
 770                 retval = krb5_auth_con_setflags( context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY);
 771                 if (retval) {
 772                         DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n",
 773                                 error_message(retval)));
 774                         goto cleanup_creds;
 775                 }
 776
 777                 retval = ads_krb5_get_fwd_ticket( context,
 778                                                 auth_context,
 779                                                 credsp,
 780                                                 ccache,
 781                                                 &in_data );
 782                 if (retval) {
 783                         DEBUG( 3, ("ads_krb5_get_fwd_ticket failed (%s)\n",
 784                                    error_message( retval ) ) );
 785
 786                         /*
 787                          * This is not fatal. Delete the *auth_context and continue
 788                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 789                          */
 790
 791                         if (in_data.data) {
 792                                 free( in_data.data );
 793                                 in_data.data = NULL;
 794                                 in_data.length = 0;
 795                         }
 796                         krb5_auth_con_free(context, *auth_context);
 797                         *auth_context = NULL;
 798                 }
 799         }
 800 #endif
 801
 802         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 803                                       &in_data, credsp, outbuf);
 804         if (retval) {
 805                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 806                          error_message(retval)));
 807         }
 808
 809         if (in_data.data) {
 810                 free( in_data.data );
 811                 in_data.length = 0;
 812         }
 813
 814         krb5_free_creds(context, credsp);
 815
 816 cleanup_creds:
 817         krb5_free_cred_contents(context, &creds);
 818
 819 cleanup_princ:
 820         krb5_free_principal(context, server);
 821         if (impersonate_princ) {
 822                 krb5_free_principal(context, impersonate_princ);
 823         }
 824
 825         return retval;
 826 }
 827
 828 /*
 829   get a kerberos5 ticket for the given service
 830 */
 831 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
 832                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 833                         uint32 extra_ap_opts, const char *ccname,
 834                         time_t *tgs_expire,
 835                         const char *impersonate_princ_s)
 836
 837 {
 838         krb5_error_code retval;
 839         krb5_data packet;
 840         krb5_context context = NULL;
 841         krb5_ccache ccdef = NULL;
 842         krb5_auth_context auth_context = NULL;
 843         krb5_enctype enc_types[] = {
 844 #ifdef ENCTYPE_ARCFOUR_HMAC
 845                 ENCTYPE_ARCFOUR_HMAC,
 846 #endif
 847                 ENCTYPE_DES_CBC_MD5,
 848                 ENCTYPE_DES_CBC_CRC,
 849                 ENCTYPE_NULL};
 850
 851         initialize_krb5_error_table();
 852         retval = krb5_init_context(&context);
 853         if (retval) {
 854                 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
 855                          error_message(retval)));
 856                 goto failed;
 857         }
 858
 859         if (time_offset != 0) {
 860                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 861         }
 862
 863         if ((retval = krb5_cc_resolve(context, ccname ?
 864                         ccname : krb5_cc_default_name(context), &ccdef))) {
 865                 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
 866                          error_message(retval)));
 867                 goto failed;
 868         }
 869
 870         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 871                 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
 872                          error_message(retval)));
 873                 goto failed;
 874         }
 875
 876         if ((retval = ads_krb5_mk_req(context,
 877                                         &auth_context,
 878                                         AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 879                                         principal,
 880                                         ccdef, &packet,
 881                                         tgs_expire,
 882                                         impersonate_princ_s))) {
 883                 goto failed;
 884         }
 885
 886         get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
 887
 888         *ticket = data_blob(packet.data, packet.length);
 889
 890         kerberos_free_data_contents(context, &packet);
 891
 892 failed:
 893
 894         if ( context ) {
 895                 if (ccdef)
 896                         krb5_cc_close(context, ccdef);
 897                 if (auth_context)
 898                         krb5_auth_con_free(context, auth_context);
 899                 krb5_free_context(context);
 900         }
 901
 902         return retval;
 903 }
 904
 905  bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
 906  {
 907         krb5_keyblock *skey = NULL;
 908         krb5_error_code err = 0;
 909         bool ret = false;
 910
 911         if (remote) {
 912                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 913         } else {
 914                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 915         }
 916
 917         if (err || skey == NULL) {
 918                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 919                 goto done;
 920         }
 921
 922         DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
 923         *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 924         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 925
 926         ret = true;
 927
 928  done:
 929         if (skey) {
 930                 krb5_free_keyblock(context, skey);
 931         }
 932
 933         return ret;
 934  }
 935
 936
 937 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 938  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 939
 940  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 941 {
 942         static krb5_data kdata;
 943
 944         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 945         kdata.length = strlen((const char *)kdata.data);
 946         return &kdata;
 947 }
 948 #endif
 949
 950  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 951 {
 952 /* Try krb5_free_keytab_entry_contents first, since
 953  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 954  * krb5_kt_free_entry but only has a prototype for the first, while the
 955  * second is considered private.
 956  */
 957 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 958         return krb5_free_keytab_entry_contents(context, kt_entry);
 959 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
 960         return krb5_kt_free_entry(context, kt_entry);
 961 #else
 962 #error UNKNOWN_KT_FREE_FUNCTION
 963 #endif
 964 }
 965
 966  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 967                                      struct PAC_SIGNATURE_DATA *sig)
 968 {
 969 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 970         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 971         cksum->checksum.length  = sig->signature.length;
 972         cksum->checksum.data    = sig->signature.data;
 973 #else
 974         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 975         cksum->length           = sig->signature.length;
 976         cksum->contents         = sig->signature.data;
 977 #endif
 978 }
 979
 980  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 981                                           const krb5_keyblock *keyblock,
 982                                          krb5_keyusage usage,
 983                                          krb5_checksum *cksum,
 984                                          uint8 *data,
 985                                          size_t length)
 986 {
 987         krb5_error_code ret;
 988
 989         /* verify the checksum */
 990
 991         /* welcome to the wonderful world of samba's kerberos abstraction layer:
 992          *
 993          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
 994          * -----------------------------------------------------------------------------
 995          * krb5_c_verify_checksum       -                       works           works
 996          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
 997          */
 998
 999 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1000         {
1001                 krb5_boolean checksum_valid = False;
1002                 krb5_data input;
1003
1004                 input.data = (char *)data;
1005                 input.length = length;
1006
1007                 ret = krb5_c_verify_checksum(context,
1008                                              keyblock,
1009                                              usage,
1010                                              &input,
1011                                              cksum,
1012                                              &checksum_valid);
1013                 if (ret) {
1014                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1015                                 error_message(ret)));
1016                         return ret;
1017                 }
1018
1019                 if (!checksum_valid)
1020                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1021         }
1022
1023 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1024
1025         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1026          * without enctype and it ignores any key_usage types - Guenther */
1027
1028         {
1029
1030                 krb5_crypto crypto;
1031                 ret = krb5_crypto_init(context,
1032                                        keyblock,
1033                                        0,
1034                                        &crypto);
1035                 if (ret) {
1036                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1037                                 error_message(ret)));
1038                         return ret;
1039                 }
1040
1041                 ret = krb5_verify_checksum(context,
1042                                            crypto,
1043                                            usage,
1044                                            data,
1045                                            length,
1046                                            cksum);
1047
1048                 krb5_crypto_destroy(context, crypto);
1049         }
1050
1051 #else
1052 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1053 #endif
1054
1055         return ret;
1056 }
1057
1058  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1059 {
1060 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1061         return tkt->enc_part2->times.authtime;
1062 #else
1063         return tkt->ticket.authtime;
1064 #endif
1065 }
1066
1067 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1068 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1069 {
1070 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1071         if (ap_req->ticket->enc_part.kvno)
1072                 return ap_req->ticket->enc_part.kvno;
1073 #else /* Heimdal */
1074         if (ap_req->ticket.enc_part.kvno)
1075                 return *ap_req->ticket.enc_part.kvno;
1076 #endif
1077         return 0;
1078 }
1079
1080 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1081 {
1082 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1083         return ap_req->ticket.enc_part.etype;
1084 #else /* MIT */
1085         return ap_req->ticket->enc_part.enctype;
1086 #endif
1087 }
1088 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1089
1090 static krb5_error_code
1091 get_key_from_keytab(krb5_context context,
1092                     krb5_const_principal server,
1093                     krb5_enctype enctype,
1094                     krb5_kvno kvno,
1095                     krb5_keyblock **out_key)
1096 {
1097         krb5_keytab_entry entry;
1098         krb5_error_code ret;
1099         krb5_keytab keytab;
1100         char *name = NULL;
1101         krb5_keyblock *keyp;
1102
1103         /* We have to open a new keytab handle here, as MIT does
1104            an implicit open/getnext/close on krb5_kt_get_entry. We
1105            may be in the middle of a keytab enumeration when this is
1106            called. JRA. */
1107
1108         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1109         if (ret) {
1110                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1111                 return ret;
1112         }
1113
1114         if ( DEBUGLEVEL >= 10 ) {
1115                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1116                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1117                                 kvno, enctype, name));
1118                         TALLOC_FREE(name);
1119                 }
1120         }
1121
1122         ret = krb5_kt_get_entry(context,
1123                                 keytab,
1124                                 server,
1125                                 kvno,
1126                                 enctype,
1127                                 &entry);
1128
1129         if (ret) {
1130                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1131                 goto out;
1132         }
1133
1134         keyp = KRB5_KT_KEY(&entry);
1135
1136         ret = krb5_copy_keyblock(context, keyp, out_key);
1137         if (ret) {
1138                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1139                 goto out;
1140         }
1141
1142         smb_krb5_kt_free_entry(context, &entry);
1143
1144 out:
1145         krb5_kt_close(context, keytab);
1146         return ret;
1147 }
1148
1149 /* Prototypes */
1150
1151  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1152                                                  const krb5_data *inbuf,
1153                                                  krb5_kvno *kvno,
1154                                                  krb5_enctype *enctype)
1155 {
1156 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1157         {
1158                 krb5_error_code ret;
1159                 krb5_ap_req ap_req;
1160
1161                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1162                 if (ret)
1163                         return ret;
1164
1165                 *kvno = get_kvno_from_ap_req(&ap_req);
1166                 *enctype = get_enctype_from_ap_req(&ap_req);
1167
1168                 free_AP_REQ(&ap_req);
1169                 return 0;
1170         }
1171 #endif
1172
1173         /* Possibly not an appropriate error code. */
1174         return KRB5KDC_ERR_BADOPTION;
1175 }
1176
1177  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1178                                                         krb5_auth_context *auth_context,
1179                                                         const krb5_data *inbuf,
1180                                                         krb5_const_principal server,
1181                                                         krb5_keytab keytab,
1182                                                         krb5_flags *ap_req_options,
1183                                                         krb5_ticket **ticket,
1184                                                         krb5_keyblock **keyblock)
1185 {
1186         krb5_error_code ret;
1187         krb5_kvno kvno;
1188         krb5_enctype enctype;
1189         krb5_keyblock *local_keyblock;
1190
1191         ret = krb5_rd_req(context,
1192                           auth_context,
1193                           inbuf,
1194                           server,
1195                           keytab,
1196                           ap_req_options,
1197                           ticket);
1198         if (ret) {
1199                 return ret;
1200         }
1201
1202 #ifdef KRB5_TICKET_HAS_KEYINFO
1203         enctype = (*ticket)->enc_part.enctype;
1204         kvno = (*ticket)->enc_part.kvno;
1205 #else
1206         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1207         if (ret) {
1208                 return ret;
1209         }
1210 #endif
1211
1212         ret = get_key_from_keytab(context,
1213                                   server,
1214                                   enctype,
1215                                   kvno,
1216                                   &local_keyblock);
1217         if (ret) {
1218                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1219                 goto out;
1220         }
1221
1222 out:
1223         if (ret && local_keyblock != NULL) {
1224                 krb5_free_keyblock(context, local_keyblock);
1225         } else {
1226                 *keyblock = local_keyblock;
1227         }
1228
1229         return ret;
1230 }
1231
1232  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1233                                             const char *name,
1234                                             krb5_principal *principal)
1235 {
1236 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1237         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1238 #endif
1239
1240         /* we are cheating here because parse_name will in fact set the realm.
1241          * We don't care as the only caller of smb_krb5_parse_name_norealm
1242          * ignores the realm anyway when calling
1243          * smb_krb5_principal_compare_any_realm later - Guenther */
1244
1245         return smb_krb5_parse_name(context, name, principal);
1246 }
1247
1248  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1249                                           krb5_const_principal princ1,
1250                                           krb5_const_principal princ2)
1251 {
1252 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1253
1254         return krb5_principal_compare_any_realm(context, princ1, princ2);
1255
1256 /* krb5_princ_size is a macro in MIT */
1257 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1258
1259         int i, len1, len2;
1260         const krb5_data *p1, *p2;
1261
1262         len1 = krb5_princ_size(context, princ1);
1263         len2 = krb5_princ_size(context, princ2);
1264
1265         if (len1 != len2)
1266                 return False;
1267
1268         for (i = 0; i < len1; i++) {
1269
1270                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1271                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1272
1273                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1274                         return False;
1275         }
1276
1277         return True;
1278 #else
1279 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1280 #endif
1281 }
1282
1283  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1284                                        const char *client_string,       /* gd@BER.SUSE.DE */
1285                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1286                                        time_t *expire_time)
1287 {
1288         krb5_error_code ret;
1289         krb5_context context = NULL;
1290         krb5_ccache ccache = NULL;
1291         krb5_principal client = NULL;
1292         krb5_creds creds, creds_in, *creds_out = NULL;
1293
1294         ZERO_STRUCT(creds);
1295         ZERO_STRUCT(creds_in);
1296
1297         initialize_krb5_error_table();
1298         ret = krb5_init_context(&context);
1299         if (ret) {
1300                 goto done;
1301         }
1302
1303         if (!ccache_string) {
1304                 ccache_string = krb5_cc_default_name(context);
1305         }
1306
1307         if (!ccache_string) {
1308                 ret = EINVAL;
1309                 goto done;
1310         }
1311
1312         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1313
1314         /* FIXME: we should not fall back to defaults */
1315         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1316         if (ret) {
1317                 goto done;
1318         }
1319
1320         if (client_string) {
1321                 ret = smb_krb5_parse_name(context, client_string, &client);
1322                 if (ret) {
1323                         goto done;
1324                 }
1325         } else {
1326                 ret = krb5_cc_get_principal(context, ccache, &client);
1327                 if (ret) {
1328                         goto done;
1329                 }
1330         }
1331
1332 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1333         {
1334                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1335                 if (ret) {
1336                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1337                         goto done;
1338                 }
1339         }
1340 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1341         {
1342                 krb5_kdc_flags flags;
1343                 krb5_realm *client_realm = NULL;
1344
1345                 ret = krb5_copy_principal(context, client, &creds_in.client);
1346                 if (ret) {
1347                         goto done;
1348                 }
1349
1350                 if (service_string) {
1351                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1352                         if (ret) {
1353                                 goto done;
1354                         }
1355                 } else {
1356                         /* build tgt service by default */
1357                         client_realm = krb5_princ_realm(context, creds_in.client);
1358                         if (!client_realm) {
1359                                 ret = ENOMEM;
1360                                 goto done;
1361                         }
1362                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1363                         if (ret) {
1364                                 goto done;
1365                         }
1366                 }
1367
1368                 flags.i = 0;
1369                 flags.b.renewable = flags.b.renew = True;
1370
1371                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1372                 if (ret) {
1373                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1374                         goto done;
1375                 }
1376
1377                 creds = *creds_out;
1378         }
1379 #else
1380 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1381 #endif
1382
1383         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1384         ret = krb5_cc_initialize(context, ccache, client);
1385         if (ret) {
1386                 goto done;
1387         }
1388
1389         ret = krb5_cc_store_cred(context, ccache, &creds);
1390
1391         if (expire_time) {
1392                 *expire_time = (time_t) creds.times.endtime;
1393         }
1394
1395 done:
1396         krb5_free_cred_contents(context, &creds_in);
1397
1398         if (creds_out) {
1399                 krb5_free_creds(context, creds_out);
1400         } else {
1401                 krb5_free_cred_contents(context, &creds);
1402         }
1403
1404         if (client) {
1405                 krb5_free_principal(context, client);
1406         }
1407         if (ccache) {
1408                 krb5_cc_close(context, ccache);
1409         }
1410         if (context) {
1411                 krb5_free_context(context);
1412         }
1413
1414         return ret;
1415 }
1416
1417  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1418 {
1419         krb5_error_code ret = 0;
1420         if (addr == NULL) {
1421                 return ret;
1422         }
1423 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1424         krb5_free_addresses(context, addr->addrs);
1425 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1426         ret = krb5_free_addresses(context, addr->addrs);
1427         SAFE_FREE(addr->addrs);
1428 #endif
1429         SAFE_FREE(addr);
1430         addr = NULL;
1431         return ret;
1432 }
1433
1434  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1435 {
1436         krb5_error_code ret = 0;
1437         nstring buf;
1438 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1439         krb5_address **addrs = NULL;
1440 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1441         krb5_addresses *addrs = NULL;
1442 #endif
1443
1444         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1445         if (*kerb_addr == NULL) {
1446                 return ENOMEM;
1447         }
1448
1449         put_name(buf, global_myname(), ' ', 0x20);
1450
1451 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1452         {
1453                 int num_addr = 2;
1454
1455                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1456                 if (addrs == NULL) {
1457                         SAFE_FREE(*kerb_addr);
1458                         return ENOMEM;
1459                 }
1460
1461                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1462
1463                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1464                 if (addrs[0] == NULL) {
1465                         SAFE_FREE(addrs);
1466                         SAFE_FREE(*kerb_addr);
1467                         return ENOMEM;
1468                 }
1469
1470                 addrs[0]->magic = KV5M_ADDRESS;
1471                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1472                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1473                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1474                 if (addrs[0]->contents == NULL) {
1475                         SAFE_FREE(addrs[0]);
1476                         SAFE_FREE(addrs);
1477                         SAFE_FREE(*kerb_addr);
1478                         return ENOMEM;
1479                 }
1480
1481                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1482
1483                 addrs[1] = NULL;
1484         }
1485 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1486         {
1487                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1488                 if (addrs == NULL) {
1489                         SAFE_FREE(*kerb_addr);
1490                         return ENOMEM;
1491                 }
1492
1493                 memset(addrs, 0, sizeof(krb5_addresses));
1494
1495                 addrs->len = 1;
1496                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1497                 if (addrs->val == NULL) {
1498                         SAFE_FREE(addrs);
1499                         SAFE_FREE(kerb_addr);
1500                         return ENOMEM;
1501                 }
1502
1503                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1504                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1505                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1506                 if (addrs->val[0].address.data == NULL) {
1507                         SAFE_FREE(addrs->val);
1508                         SAFE_FREE(addrs);
1509                         SAFE_FREE(*kerb_addr);
1510                         return ENOMEM;
1511                 }
1512
1513                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1514         }
1515 #else
1516 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1517 #endif
1518         (*kerb_addr)->addrs = addrs;
1519
1520         return ret;
1521 }
1522
1523  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1524 {
1525 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1526         krb5_free_error_contents(context, krberror);
1527 #else /* MIT */
1528         krb5_free_error(context, krberror);
1529 #endif
1530 }
1531
1532  krb5_error_code handle_krberror_packet(krb5_context context,
1533                                         krb5_data *packet)
1534 {
1535         krb5_error_code ret;
1536         bool got_error_code = False;
1537
1538         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1539
1540 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1541         {
1542                 krb5_error krberror;
1543
1544                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1545                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1546                                 error_message(ret)));
1547                         return ret;
1548                 }
1549
1550                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1551                         ret = (krb5_error_code) krberror.error_code;
1552                         got_error_code = True;
1553                 }
1554
1555                 smb_krb5_free_error(context, &krberror);
1556         }
1557 #else /* MIT */
1558         {
1559                 krb5_error *krberror;
1560
1561                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1562                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1563                                 error_message(ret)));
1564                         return ret;
1565                 }
1566
1567                 if (krberror->e_data.data == NULL) {
1568 #if defined(ERROR_TABLE_BASE_krb5)
1569                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1570 #else
1571                         ret = (krb5_error_code)krberror->error;
1572 #endif
1573                         got_error_code = True;
1574                 }
1575                 smb_krb5_free_error(context, krberror);
1576         }
1577 #endif
1578         if (got_error_code) {
1579                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1580                         error_message(ret), ret));
1581         }
1582         return ret;
1583 }
1584
1585  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1586                                             krb5_get_init_creds_opt **opt)
1587 {
1588 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1589         /* Heimdal or modern MIT version */
1590         return krb5_get_init_creds_opt_alloc(context, opt);
1591 #else
1592         /* Historical MIT version */
1593         krb5_get_init_creds_opt *my_opt;
1594
1595         *opt = NULL;
1596
1597         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1598                 return ENOMEM;
1599         }
1600
1601         krb5_get_init_creds_opt_init(my_opt);
1602
1603         *opt =  my_opt;
1604         return 0;
1605 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1606 }
1607
1608  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1609                                 krb5_get_init_creds_opt *opt)
1610 {
1611 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1612
1613 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1614         /* Modern MIT or Heimdal version */
1615         krb5_get_init_creds_opt_free(context, opt);
1616 #else
1617         /* Heimdal version */
1618         krb5_get_init_creds_opt_free(opt);
1619 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1620
1621 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1622         /* Historical MIT version */
1623         SAFE_FREE(opt);
1624         opt = NULL;
1625 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1626 }
1627
1628  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1629 {
1630         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1631 }
1632
1633
1634 /* caller needs to free etype_s */
1635  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1636                                             krb5_enctype enctype,
1637                                             char **etype_s)
1638 {
1639 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1640         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1641 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1642         char buf[256];
1643         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1644         if (ret) {
1645                 return ret;
1646         }
1647         *etype_s = SMB_STRDUP(buf);
1648         if (!*etype_s) {
1649                 return ENOMEM;
1650         }
1651         return ret;
1652 #else
1653 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1654 #endif
1655 }
1656
1657  krb5_error_code smb_krb5_mk_error(krb5_context context,
1658                                 krb5_error_code error_code,
1659                                 const krb5_principal server,
1660                                 krb5_data *reply)
1661 {
1662 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1663         /*
1664          * The MIT interface is *terrible*.
1665          * We have to construct this ourselves...
1666          */
1667         krb5_error e;
1668
1669         memset(&e, 0, sizeof(e));
1670         krb5_us_timeofday(context, &e.stime, &e.susec);
1671         e.server = server;
1672 #if defined(krb5_err_base)
1673         e.error = error_code - krb5_err_base;
1674 #elif defined(ERROR_TABLE_BASE_krb5)
1675         e.error = error_code - ERROR_TABLE_BASE_krb5;
1676 #else
1677         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1678 #endif
1679
1680         return krb5_mk_error(context, &e, reply);
1681 #else /* Heimdal. */
1682         return krb5_mk_error(context,
1683                                 error_code,
1684                                 NULL,
1685                                 NULL, /* e_data */
1686                                 NULL,
1687                                 server,
1688                                 NULL,
1689                                 NULL,
1690                                 reply);
1691 #endif
1692 }
1693
1694 /**********************************************************************
1695  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1696  * allows to process non-default keytab names.
1697  * @param context krb5_context
1698  * @param keytab_name_req string
1699  * @param write_access bool if writable keytab is required
1700  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1701  * @return krb5_error_code
1702 **********************************************************************/
1703
1704 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1705 #ifndef MAX_KEYTAB_NAME_LEN
1706 #define MAX_KEYTAB_NAME_LEN 1100
1707 #endif
1708
1709  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1710                                       const char *keytab_name_req,
1711                                       bool write_access,
1712                                       krb5_keytab *keytab)
1713 {
1714         krb5_error_code ret = 0;
1715         TALLOC_CTX *mem_ctx;
1716         char keytab_string[MAX_KEYTAB_NAME_LEN];
1717         char *kt_str = NULL;
1718         bool found_valid_name = False;
1719         const char *pragma = "FILE";
1720         const char *tmp = NULL;
1721
1722         if (!write_access && !keytab_name_req) {
1723                 /* caller just wants to read the default keytab readonly, so be it */
1724                 return krb5_kt_default(context, keytab);
1725         }
1726
1727         mem_ctx = talloc_init("smb_krb5_open_keytab");
1728         if (!mem_ctx) {
1729                 return ENOMEM;
1730         }
1731
1732 #ifdef HAVE_WRFILE_KEYTAB
1733         if (write_access) {
1734                 pragma = "WRFILE";
1735         }
1736 #endif
1737
1738         if (keytab_name_req) {
1739
1740                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1741                         ret = KRB5_CONFIG_NOTENUFSPACE;
1742                         goto out;
1743                 }
1744
1745                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1746                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1747                         tmp = keytab_name_req;
1748                         goto resolve;
1749                 }
1750
1751                 if (keytab_name_req[0] != '/') {
1752                         ret = KRB5_KT_BADNAME;
1753                         goto out;
1754                 }
1755
1756                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1757                 if (!tmp) {
1758                         ret = ENOMEM;
1759                         goto out;
1760                 }
1761
1762                 goto resolve;
1763         }
1764
1765         /* we need to handle more complex keytab_strings, like:
1766          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1767
1768         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1769         if (ret) {
1770                 goto out;
1771         }
1772
1773         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1774
1775         tmp = talloc_strdup(mem_ctx, keytab_string);
1776         if (!tmp) {
1777                 ret = ENOMEM;
1778                 goto out;
1779         }
1780
1781         if (strncmp(tmp, "ANY:", 4) == 0) {
1782                 tmp += 4;
1783         }
1784
1785         memset(&keytab_string, '\0', sizeof(keytab_string));
1786
1787         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1788                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1789                         found_valid_name = True;
1790                         tmp = kt_str;
1791                         tmp += 7;
1792                 }
1793
1794                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1795                         found_valid_name = True;
1796                         tmp = kt_str;
1797                         tmp += 5;
1798                 }
1799
1800                 if (tmp[0] == '/') {
1801                         /* Treat as a FILE: keytab definition. */
1802                         found_valid_name = true;
1803                 }
1804
1805                 if (found_valid_name) {
1806                         if (tmp[0] != '/') {
1807                                 ret = KRB5_KT_BADNAME;
1808                                 goto out;
1809                         }
1810
1811                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1812                         if (!tmp) {
1813                                 ret = ENOMEM;
1814                                 goto out;
1815                         }
1816                         break;
1817                 }
1818         }
1819
1820         if (!found_valid_name) {
1821                 ret = KRB5_KT_UNKNOWN_TYPE;
1822                 goto out;
1823         }
1824
1825  resolve:
1826         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1827         ret = krb5_kt_resolve(context, tmp, keytab);
1828
1829  out:
1830         TALLOC_FREE(mem_ctx);
1831         return ret;
1832 }
1833
1834 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1835                                      krb5_context context,
1836                                      krb5_keytab keytab,
1837                                      const char **keytab_name)
1838 {
1839         char keytab_string[MAX_KEYTAB_NAME_LEN];
1840         krb5_error_code ret = 0;
1841
1842         ret = krb5_kt_get_name(context, keytab,
1843                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1844         if (ret) {
1845                 return ret;
1846         }
1847
1848         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1849         if (!*keytab_name) {
1850                 return ENOMEM;
1851         }
1852
1853         return ret;
1854 }
1855
1856 #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)
1857 /**************************************************************
1858 Routine: ads_krb5_get_fwd_ticket
1859  Description:
1860     When a service ticket is flagged as trusted
1861     for delegation we should provide a forwardable
1862     ticket so that the remote host can act on our
1863     behalf.  This is done by taking the 2nd forwardable
1864     TGT and storing it in the GSS-API authenticator
1865     "checksum".  This routine will populate
1866     the krb5_data authenticator with this TGT.
1867  Parameters:
1868     krb5_context context: The kerberos context for this authentication.
1869     krb5_auth_context:    The authentication context.
1870     krb5_creds *credsp:   The ticket credentials (AS-REP).
1871     krb5_ccache ccache:   The credentials cache.
1872     krb5_data &authenticator: The checksum field that will store the TGT, and
1873      authenticator.data must be freed by the caller.
1874
1875  Returns:
1876     krb5_error_code: 0 if no errors, otherwise set.
1877 **************************************************************/
1878
1879 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1880                                          krb5_auth_context *auth_context,
1881                                          krb5_creds *credsp,
1882                                          krb5_ccache ccache,
1883                                          krb5_data *authenticator)
1884 {
1885         krb5_data fwdData;
1886         krb5_error_code retval = 0;
1887         char *pChksum = NULL;
1888         char *p = NULL;
1889
1890 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
1891    but still has the symbol */
1892 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
1893 krb5_error_code krb5_auth_con_set_req_cksumtype(
1894         krb5_context     context,
1895         krb5_auth_context      auth_context,
1896         krb5_cksumtype     cksumtype);
1897 #endif
1898
1899         ZERO_STRUCT(fwdData);
1900         ZERO_STRUCTP(authenticator);
1901
1902         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1903                                 *auth_context,  /* Authentication context [in] */
1904                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
1905                                 credsp->client, /* Client principal for the tgt [in] */
1906                                 credsp->server, /* Server principal for the tgt [in] */
1907                                 ccache,         /* Credential cache to use for storage [in] */
1908                                 1,              /* Turn on for "Forwardable ticket" [in] */
1909                                 &fwdData );     /* Resulting response [out] */
1910
1911
1912         if (retval) {
1913                 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1914                         error_message(retval)));
1915                 goto out;
1916         }
1917
1918         if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1919                 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1920                 retval = EINVAL;
1921                 goto out;
1922         }
1923
1924         /* We're going to allocate a gssChecksum structure with a little
1925            extra data the length of the kerberos credentials length
1926            (APPLICATION 22) so that we can pack it on the end of the structure.
1927         */
1928
1929         pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1930         if (!pChksum) {
1931                 retval = ENOMEM;
1932                 goto out;
1933         }
1934
1935         p = pChksum;
1936
1937         SIVAL(p, 0, GSSAPI_BNDLENGTH);
1938         p += 4;
1939
1940         /* Zero out the bindings fields */
1941         memset(p, '\0', GSSAPI_BNDLENGTH );
1942         p += GSSAPI_BNDLENGTH;
1943
1944         SIVAL(p, 0, GSS_C_DELEG_FLAG );
1945         p += 4;
1946         SSVAL(p, 0, 1 );
1947         p += 2;
1948         SSVAL(p, 0, fwdData.length );
1949         p += 2;
1950
1951         /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1952         memcpy(p, fwdData.data, fwdData.length );
1953         p += fwdData.length;
1954
1955         /* We need to do this in order to allow our GSS-API  */
1956         retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1957         if (retval) {
1958                 goto out;
1959         }
1960
1961         /* We now have a service ticket, now turn it into an AP-REQ. */
1962         authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1963
1964         /* Caller should call free() when they're done with this. */
1965         authenticator->data = (char *)pChksum;
1966
1967   out:
1968
1969         /* Remove that input data, we never needed it anyway. */
1970         if (fwdData.length > 0) {
1971                 krb5_free_data_contents( context, &fwdData );
1972         }
1973
1974         return retval;
1975 }
1976 #endif
1977
1978 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1979     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1980     defined(HAVE_KRB5_GET_CREDS)
1981 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1982                                                              krb5_ccache ccache,
1983                                                              krb5_principal me,
1984                                                              krb5_principal server,
1985                                                              krb5_principal impersonate_princ,
1986                                                              krb5_creds **out_creds)
1987 {
1988         krb5_error_code ret;
1989         krb5_get_creds_opt opt;
1990
1991         ret = krb5_get_creds_opt_alloc(context, &opt);
1992         if (ret) {
1993                 goto done;
1994         }
1995         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1996
1997         if (impersonate_princ) {
1998                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1999                                                          impersonate_princ);
2000                 if (ret) {
2001                         goto done;
2002                 }
2003         }
2004
2005         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2006         if (ret) {
2007                 goto done;
2008         }
2009
2010  done:
2011         if (opt) {
2012                 krb5_get_creds_opt_free(context, opt);
2013         }
2014         return ret;
2015 }
2016 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2017
2018 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2019 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2020                                                          krb5_ccache ccache,
2021                                                          krb5_principal me,
2022                                                          krb5_principal server,
2023                                                          krb5_principal impersonate_princ,
2024                                                          krb5_creds **out_creds)
2025 {
2026         krb5_error_code ret;
2027         krb5_creds in_creds;
2028
2029 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2030 krb5_error_code KRB5_CALLCONV
2031 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2032                               krb5_ccache ccache, krb5_creds *in_creds,
2033                               krb5_data *subject_cert,
2034                               krb5_creds **out_creds);
2035 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2036
2037         ZERO_STRUCT(in_creds);
2038
2039         if (impersonate_princ) {
2040
2041                 in_creds.server = me;
2042                 in_creds.client = impersonate_princ;
2043
2044                 ret = krb5_get_credentials_for_user(context,
2045                                                     0, /* krb5_flags options */
2046                                                     ccache,
2047                                                     &in_creds,
2048                                                     NULL, /* krb5_data *subject_cert */
2049                                                     out_creds);
2050         } else {
2051                 in_creds.client = me;
2052                 in_creds.server = server;
2053
2054                 ret = krb5_get_credentials(context, 0, ccache,
2055                                            &in_creds, out_creds);
2056         }
2057
2058         return ret;
2059 }
2060 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2061
2062 /*
2063  * smb_krb5_get_credentials
2064  *
2065  * @brief Get krb5 credentials for a server
2066  *
2067  * @param[in] context           An initialized krb5_context
2068  * @param[in] ccache            An initialized krb5_ccache
2069  * @param[in] me                The krb5_principal of the caller
2070  * @param[in] server            The krb5_principal of the requested service
2071  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2072  * @param[out] out_creds        The returned krb5_creds structure
2073  * @return krb5_error_code
2074  *
2075  */
2076 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2077                                          krb5_ccache ccache,
2078                                          krb5_principal me,
2079                                          krb5_principal server,
2080                                          krb5_principal impersonate_princ,
2081                                          krb5_creds **out_creds)
2082 {
2083         krb5_error_code ret;
2084         krb5_creds *creds = NULL;
2085
2086         *out_creds = NULL;
2087
2088         if (impersonate_princ) {
2089 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2090                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2091 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2092                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2093 #else
2094                 ret = ENOTSUP;
2095 #endif
2096         } else {
2097                 krb5_creds in_creds;
2098
2099                 ZERO_STRUCT(in_creds);
2100
2101                 in_creds.client = me;
2102                 in_creds.server = server;
2103
2104                 ret = krb5_get_credentials(context, 0, ccache,
2105                                            &in_creds, &creds);
2106         }
2107         if (ret) {
2108                 goto done;
2109         }
2110
2111         ret = krb5_cc_store_cred(context, ccache, creds);
2112         if (ret) {
2113                 goto done;
2114         }
2115
2116         if (out_creds) {
2117                 *out_creds = creds;
2118         }
2119
2120  done:
2121         if (creds && ret) {
2122                 krb5_free_creds(context, creds);
2123         }
2124
2125         return ret;
2126 }
2127
2128 /*
2129  * smb_krb5_get_creds
2130  *
2131  * @brief Get krb5 credentials for a server
2132  *
2133  * @param[in] server_s          The string name of the service
2134  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2135  * @param[in] cc                The krb5 credential cache string name (optional)
2136  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2137  * @param[out] creds_p          The returned krb5_creds structure
2138  * @return krb5_error_code
2139  *
2140  */
2141 krb5_error_code smb_krb5_get_creds(const char *server_s,
2142                                    time_t time_offset,
2143                                    const char *cc,
2144                                    const char *impersonate_princ_s,
2145                                    krb5_creds **creds_p)
2146 {
2147         krb5_error_code ret;
2148         krb5_context context = NULL;
2149         krb5_principal me = NULL;
2150         krb5_principal server = NULL;
2151         krb5_principal impersonate_princ = NULL;
2152         krb5_creds *creds = NULL;
2153         krb5_ccache ccache = NULL;
2154
2155         *creds_p = NULL;
2156
2157         initialize_krb5_error_table();
2158         ret = krb5_init_context(&context);
2159         if (ret) {
2160                 goto done;
2161         }
2162
2163         if (time_offset != 0) {
2164                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2165         }
2166
2167         ret = krb5_cc_resolve(context, cc ? cc :
2168                 krb5_cc_default_name(context), &ccache);
2169         if (ret) {
2170                 goto done;
2171         }
2172
2173         ret = krb5_cc_get_principal(context, ccache, &me);
2174         if (ret) {
2175                 goto done;
2176         }
2177
2178         ret = smb_krb5_parse_name(context, server_s, &server);
2179         if (ret) {
2180                 goto done;
2181         }
2182
2183         if (impersonate_princ_s) {
2184                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2185                                           &impersonate_princ);
2186                 if (ret) {
2187                         goto done;
2188                 }
2189         }
2190
2191         ret = smb_krb5_get_credentials(context, ccache,
2192                                        me, server, impersonate_princ,
2193                                        &creds);
2194         if (ret) {
2195                 goto done;
2196         }
2197
2198         ret = krb5_cc_store_cred(context, ccache, creds);
2199         if (ret) {
2200                 goto done;
2201         }
2202
2203         if (creds_p) {
2204                 *creds_p = creds;
2205         }
2206
2207         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2208                 server_s));
2209
2210         if (impersonate_princ_s) {
2211                 char *client = NULL;
2212
2213                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2214                 if (ret) {
2215                         goto done;
2216                 }
2217                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2218                         client));
2219                 TALLOC_FREE(client);
2220         }
2221
2222  done:
2223         if (!context) {
2224                 return ret;
2225         }
2226
2227         if (creds && ret) {
2228                 krb5_free_creds(context, creds);
2229         }
2230         if (server) {
2231                 krb5_free_principal(context, server);
2232         }
2233         if (me) {
2234                 krb5_free_principal(context, me);
2235         }
2236         if (impersonate_princ) {
2237                 krb5_free_principal(context, impersonate_princ);
2238         }
2239         if (ccache) {
2240                 krb5_cc_close(context, ccache);
2241         }
2242         krb5_free_context(context);
2243
2244         return ret;
2245 }
2246
2247 /*
2248  * smb_krb5_principal_get_realm
2249  *
2250  * @brief Get realm of a principal
2251  *
2252  * @param[in] context           The krb5_context
2253  * @param[in] principal         The principal
2254  * @return pointer to the realm
2255  *
2256  */
2257
2258 char *smb_krb5_principal_get_realm(krb5_context context,
2259                                    krb5_principal principal)
2260 {
2261 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2262         return krb5_principal_get_realm(context, principal);
2263 #elif defined(krb5_princ_realm) /* MIT */
2264         krb5_data *realm;
2265         realm = krb5_princ_realm(context, principal);
2266         return (char *)realm->data;
2267 #else
2268         return NULL;
2269 #endif
2270 }
2271
2272 #else /* HAVE_KRB5 */
2273  /* this saves a few linking headaches */
2274  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
2275                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
2276                         const char *ccname, time_t *tgs_expire,
2277                         const char *impersonate_princ_s)
2278 {
2279          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2280          return 1;
2281 }
2282
2283 #endif