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
  26 #ifndef KRB5_AUTHDATA_WIN2K_PAC
  27 #define KRB5_AUTHDATA_WIN2K_PAC 128
  28 #endif
  29
  30 #ifndef KRB5_AUTHDATA_IF_RELEVANT
  31 #define KRB5_AUTHDATA_IF_RELEVANT 1
  32 #endif
  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, ("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, ("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, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 872                          error_message(retval)));
 873                 goto failed;
 874         }
 875
 876         retval = ads_krb5_mk_req(context, &auth_context,
 877                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 878                                 principal, ccdef, &packet,
 879                                 tgs_expire, impersonate_princ_s);
 880         if (retval) {
 881                 goto failed;
 882         }
 883
 884         get_krb5_smb_session_key(context, auth_context,
 885                                  session_key_krb5, False);
 886
 887         *ticket = data_blob(packet.data, packet.length);
 888
 889         kerberos_free_data_contents(context, &packet);
 890
 891 failed:
 892
 893         if (context) {
 894                 if (ccdef)
 895                         krb5_cc_close(context, ccdef);
 896                 if (auth_context)
 897                         krb5_auth_con_free(context, auth_context);
 898                 krb5_free_context(context);
 899         }
 900
 901         return retval;
 902 }
 903
 904  bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
 905  {
 906         krb5_keyblock *skey = NULL;
 907         krb5_error_code err = 0;
 908         bool ret = false;
 909
 910         if (remote) {
 911                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 912         } else {
 913                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 914         }
 915
 916         if (err || skey == NULL) {
 917                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 918                 goto done;
 919         }
 920
 921         DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
 922         *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 923         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 924
 925         ret = true;
 926
 927  done:
 928         if (skey) {
 929                 krb5_free_keyblock(context, skey);
 930         }
 931
 932         return ret;
 933  }
 934
 935
 936 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 937  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 938
 939  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 940 {
 941         static krb5_data kdata;
 942
 943         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 944         kdata.length = strlen((const char *)kdata.data);
 945         return &kdata;
 946 }
 947 #endif
 948
 949  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 950 {
 951 /* Try krb5_free_keytab_entry_contents first, since
 952  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 953  * krb5_kt_free_entry but only has a prototype for the first, while the
 954  * second is considered private.
 955  */
 956 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 957         return krb5_free_keytab_entry_contents(context, kt_entry);
 958 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
 959         return krb5_kt_free_entry(context, kt_entry);
 960 #else
 961 #error UNKNOWN_KT_FREE_FUNCTION
 962 #endif
 963 }
 964
 965  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 966                                      struct PAC_SIGNATURE_DATA *sig)
 967 {
 968 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 969         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 970         cksum->checksum.length  = sig->signature.length;
 971         cksum->checksum.data    = sig->signature.data;
 972 #else
 973         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 974         cksum->length           = sig->signature.length;
 975         cksum->contents         = sig->signature.data;
 976 #endif
 977 }
 978
 979  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 980                                           const krb5_keyblock *keyblock,
 981                                          krb5_keyusage usage,
 982                                          krb5_checksum *cksum,
 983                                          uint8 *data,
 984                                          size_t length)
 985 {
 986         krb5_error_code ret;
 987
 988         /* verify the checksum */
 989
 990         /* welcome to the wonderful world of samba's kerberos abstraction layer:
 991          *
 992          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
 993          * -----------------------------------------------------------------------------
 994          * krb5_c_verify_checksum       -                       works           works
 995          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
 996          */
 997
 998 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
 999         {
1000                 krb5_boolean checksum_valid = False;
1001                 krb5_data input;
1002
1003                 input.data = (char *)data;
1004                 input.length = length;
1005
1006                 ret = krb5_c_verify_checksum(context,
1007                                              keyblock,
1008                                              usage,
1009                                              &input,
1010                                              cksum,
1011                                              &checksum_valid);
1012                 if (ret) {
1013                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1014                                 error_message(ret)));
1015                         return ret;
1016                 }
1017
1018                 if (!checksum_valid)
1019                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1020         }
1021
1022 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1023
1024         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1025          * without enctype and it ignores any key_usage types - Guenther */
1026
1027         {
1028
1029                 krb5_crypto crypto;
1030                 ret = krb5_crypto_init(context,
1031                                        keyblock,
1032                                        0,
1033                                        &crypto);
1034                 if (ret) {
1035                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1036                                 error_message(ret)));
1037                         return ret;
1038                 }
1039
1040                 ret = krb5_verify_checksum(context,
1041                                            crypto,
1042                                            usage,
1043                                            data,
1044                                            length,
1045                                            cksum);
1046
1047                 krb5_crypto_destroy(context, crypto);
1048         }
1049
1050 #else
1051 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1052 #endif
1053
1054         return ret;
1055 }
1056
1057  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1058 {
1059 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1060         return tkt->enc_part2->times.authtime;
1061 #else
1062         return tkt->ticket.authtime;
1063 #endif
1064 }
1065
1066 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1067 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1068 {
1069 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1070         if (ap_req->ticket->enc_part.kvno)
1071                 return ap_req->ticket->enc_part.kvno;
1072 #else /* Heimdal */
1073         if (ap_req->ticket.enc_part.kvno)
1074                 return *ap_req->ticket.enc_part.kvno;
1075 #endif
1076         return 0;
1077 }
1078
1079 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1080 {
1081 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1082         return ap_req->ticket.enc_part.etype;
1083 #else /* MIT */
1084         return ap_req->ticket->enc_part.enctype;
1085 #endif
1086 }
1087 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1088
1089 static krb5_error_code
1090 get_key_from_keytab(krb5_context context,
1091                     krb5_const_principal server,
1092                     krb5_enctype enctype,
1093                     krb5_kvno kvno,
1094                     krb5_keyblock **out_key)
1095 {
1096         krb5_keytab_entry entry;
1097         krb5_error_code ret;
1098         krb5_keytab keytab;
1099         char *name = NULL;
1100         krb5_keyblock *keyp;
1101
1102         /* We have to open a new keytab handle here, as MIT does
1103            an implicit open/getnext/close on krb5_kt_get_entry. We
1104            may be in the middle of a keytab enumeration when this is
1105            called. JRA. */
1106
1107         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1108         if (ret) {
1109                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1110                 return ret;
1111         }
1112
1113         if ( DEBUGLEVEL >= 10 ) {
1114                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1115                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1116                                 kvno, enctype, name));
1117                         TALLOC_FREE(name);
1118                 }
1119         }
1120
1121         ret = krb5_kt_get_entry(context,
1122                                 keytab,
1123                                 server,
1124                                 kvno,
1125                                 enctype,
1126                                 &entry);
1127
1128         if (ret) {
1129                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1130                 goto out;
1131         }
1132
1133         keyp = KRB5_KT_KEY(&entry);
1134
1135         ret = krb5_copy_keyblock(context, keyp, out_key);
1136         if (ret) {
1137                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1138                 goto out;
1139         }
1140
1141         smb_krb5_kt_free_entry(context, &entry);
1142
1143 out:
1144         krb5_kt_close(context, keytab);
1145         return ret;
1146 }
1147
1148 /* Prototypes */
1149
1150  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1151                                                  const krb5_data *inbuf,
1152                                                  krb5_kvno *kvno,
1153                                                  krb5_enctype *enctype)
1154 {
1155 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1156         {
1157                 krb5_error_code ret;
1158                 krb5_ap_req ap_req;
1159
1160                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1161                 if (ret)
1162                         return ret;
1163
1164                 *kvno = get_kvno_from_ap_req(&ap_req);
1165                 *enctype = get_enctype_from_ap_req(&ap_req);
1166
1167                 free_AP_REQ(&ap_req);
1168                 return 0;
1169         }
1170 #endif
1171
1172         /* Possibly not an appropriate error code. */
1173         return KRB5KDC_ERR_BADOPTION;
1174 }
1175
1176  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1177                                                         krb5_auth_context *auth_context,
1178                                                         const krb5_data *inbuf,
1179                                                         krb5_const_principal server,
1180                                                         krb5_keytab keytab,
1181                                                         krb5_flags *ap_req_options,
1182                                                         krb5_ticket **ticket,
1183                                                         krb5_keyblock **keyblock)
1184 {
1185         krb5_error_code ret;
1186         krb5_kvno kvno;
1187         krb5_enctype enctype;
1188         krb5_keyblock *local_keyblock;
1189
1190         ret = krb5_rd_req(context,
1191                           auth_context,
1192                           inbuf,
1193                           server,
1194                           keytab,
1195                           ap_req_options,
1196                           ticket);
1197         if (ret) {
1198                 return ret;
1199         }
1200
1201 #ifdef KRB5_TICKET_HAS_KEYINFO
1202         enctype = (*ticket)->enc_part.enctype;
1203         kvno = (*ticket)->enc_part.kvno;
1204 #else
1205         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1206         if (ret) {
1207                 return ret;
1208         }
1209 #endif
1210
1211         ret = get_key_from_keytab(context,
1212                                   server,
1213                                   enctype,
1214                                   kvno,
1215                                   &local_keyblock);
1216         if (ret) {
1217                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1218                 goto out;
1219         }
1220
1221 out:
1222         if (ret && local_keyblock != NULL) {
1223                 krb5_free_keyblock(context, local_keyblock);
1224         } else {
1225                 *keyblock = local_keyblock;
1226         }
1227
1228         return ret;
1229 }
1230
1231  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1232                                             const char *name,
1233                                             krb5_principal *principal)
1234 {
1235 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1236         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1237 #endif
1238
1239         /* we are cheating here because parse_name will in fact set the realm.
1240          * We don't care as the only caller of smb_krb5_parse_name_norealm
1241          * ignores the realm anyway when calling
1242          * smb_krb5_principal_compare_any_realm later - Guenther */
1243
1244         return smb_krb5_parse_name(context, name, principal);
1245 }
1246
1247  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1248                                           krb5_const_principal princ1,
1249                                           krb5_const_principal princ2)
1250 {
1251 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1252
1253         return krb5_principal_compare_any_realm(context, princ1, princ2);
1254
1255 /* krb5_princ_size is a macro in MIT */
1256 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1257
1258         int i, len1, len2;
1259         const krb5_data *p1, *p2;
1260
1261         len1 = krb5_princ_size(context, princ1);
1262         len2 = krb5_princ_size(context, princ2);
1263
1264         if (len1 != len2)
1265                 return False;
1266
1267         for (i = 0; i < len1; i++) {
1268
1269                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1270                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1271
1272                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1273                         return False;
1274         }
1275
1276         return True;
1277 #else
1278 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1279 #endif
1280 }
1281
1282  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1283                                        const char *client_string,       /* gd@BER.SUSE.DE */
1284                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1285                                        time_t *expire_time)
1286 {
1287         krb5_error_code ret;
1288         krb5_context context = NULL;
1289         krb5_ccache ccache = NULL;
1290         krb5_principal client = NULL;
1291         krb5_creds creds, creds_in, *creds_out = NULL;
1292
1293         ZERO_STRUCT(creds);
1294         ZERO_STRUCT(creds_in);
1295
1296         initialize_krb5_error_table();
1297         ret = krb5_init_context(&context);
1298         if (ret) {
1299                 goto done;
1300         }
1301
1302         if (!ccache_string) {
1303                 ccache_string = krb5_cc_default_name(context);
1304         }
1305
1306         if (!ccache_string) {
1307                 ret = EINVAL;
1308                 goto done;
1309         }
1310
1311         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1312
1313         /* FIXME: we should not fall back to defaults */
1314         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1315         if (ret) {
1316                 goto done;
1317         }
1318
1319         if (client_string) {
1320                 ret = smb_krb5_parse_name(context, client_string, &client);
1321                 if (ret) {
1322                         goto done;
1323                 }
1324         } else {
1325                 ret = krb5_cc_get_principal(context, ccache, &client);
1326                 if (ret) {
1327                         goto done;
1328                 }
1329         }
1330
1331 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1332         {
1333                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1334                 if (ret) {
1335                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1336                         goto done;
1337                 }
1338         }
1339 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1340         {
1341                 krb5_kdc_flags flags;
1342                 krb5_realm *client_realm = NULL;
1343
1344                 ret = krb5_copy_principal(context, client, &creds_in.client);
1345                 if (ret) {
1346                         goto done;
1347                 }
1348
1349                 if (service_string) {
1350                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1351                         if (ret) {
1352                                 goto done;
1353                         }
1354                 } else {
1355                         /* build tgt service by default */
1356                         client_realm = krb5_princ_realm(context, creds_in.client);
1357                         if (!client_realm) {
1358                                 ret = ENOMEM;
1359                                 goto done;
1360                         }
1361                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1362                         if (ret) {
1363                                 goto done;
1364                         }
1365                 }
1366
1367                 flags.i = 0;
1368                 flags.b.renewable = flags.b.renew = True;
1369
1370                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1371                 if (ret) {
1372                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1373                         goto done;
1374                 }
1375
1376                 creds = *creds_out;
1377         }
1378 #else
1379 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1380 #endif
1381
1382         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1383         ret = krb5_cc_initialize(context, ccache, client);
1384         if (ret) {
1385                 goto done;
1386         }
1387
1388         ret = krb5_cc_store_cred(context, ccache, &creds);
1389
1390         if (expire_time) {
1391                 *expire_time = (time_t) creds.times.endtime;
1392         }
1393
1394 done:
1395         krb5_free_cred_contents(context, &creds_in);
1396
1397         if (creds_out) {
1398                 krb5_free_creds(context, creds_out);
1399         } else {
1400                 krb5_free_cred_contents(context, &creds);
1401         }
1402
1403         if (client) {
1404                 krb5_free_principal(context, client);
1405         }
1406         if (ccache) {
1407                 krb5_cc_close(context, ccache);
1408         }
1409         if (context) {
1410                 krb5_free_context(context);
1411         }
1412
1413         return ret;
1414 }
1415
1416  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1417 {
1418         krb5_error_code ret = 0;
1419         if (addr == NULL) {
1420                 return ret;
1421         }
1422 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1423         krb5_free_addresses(context, addr->addrs);
1424 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1425         ret = krb5_free_addresses(context, addr->addrs);
1426         SAFE_FREE(addr->addrs);
1427 #endif
1428         SAFE_FREE(addr);
1429         addr = NULL;
1430         return ret;
1431 }
1432
1433  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1434 {
1435         krb5_error_code ret = 0;
1436         nstring buf;
1437 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1438         krb5_address **addrs = NULL;
1439 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1440         krb5_addresses *addrs = NULL;
1441 #endif
1442
1443         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1444         if (*kerb_addr == NULL) {
1445                 return ENOMEM;
1446         }
1447
1448         put_name(buf, global_myname(), ' ', 0x20);
1449
1450 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1451         {
1452                 int num_addr = 2;
1453
1454                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1455                 if (addrs == NULL) {
1456                         SAFE_FREE(*kerb_addr);
1457                         return ENOMEM;
1458                 }
1459
1460                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1461
1462                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1463                 if (addrs[0] == NULL) {
1464                         SAFE_FREE(addrs);
1465                         SAFE_FREE(*kerb_addr);
1466                         return ENOMEM;
1467                 }
1468
1469                 addrs[0]->magic = KV5M_ADDRESS;
1470                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1471                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1472                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1473                 if (addrs[0]->contents == NULL) {
1474                         SAFE_FREE(addrs[0]);
1475                         SAFE_FREE(addrs);
1476                         SAFE_FREE(*kerb_addr);
1477                         return ENOMEM;
1478                 }
1479
1480                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1481
1482                 addrs[1] = NULL;
1483         }
1484 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1485         {
1486                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1487                 if (addrs == NULL) {
1488                         SAFE_FREE(*kerb_addr);
1489                         return ENOMEM;
1490                 }
1491
1492                 memset(addrs, 0, sizeof(krb5_addresses));
1493
1494                 addrs->len = 1;
1495                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1496                 if (addrs->val == NULL) {
1497                         SAFE_FREE(addrs);
1498                         SAFE_FREE(kerb_addr);
1499                         return ENOMEM;
1500                 }
1501
1502                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1503                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1504                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1505                 if (addrs->val[0].address.data == NULL) {
1506                         SAFE_FREE(addrs->val);
1507                         SAFE_FREE(addrs);
1508                         SAFE_FREE(*kerb_addr);
1509                         return ENOMEM;
1510                 }
1511
1512                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1513         }
1514 #else
1515 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1516 #endif
1517         (*kerb_addr)->addrs = addrs;
1518
1519         return ret;
1520 }
1521
1522  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1523 {
1524 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1525         krb5_free_error_contents(context, krberror);
1526 #else /* MIT */
1527         krb5_free_error(context, krberror);
1528 #endif
1529 }
1530
1531  krb5_error_code handle_krberror_packet(krb5_context context,
1532                                         krb5_data *packet)
1533 {
1534         krb5_error_code ret;
1535         bool got_error_code = False;
1536
1537         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1538
1539 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1540         {
1541                 krb5_error krberror;
1542
1543                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1544                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1545                                 error_message(ret)));
1546                         return ret;
1547                 }
1548
1549                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1550                         ret = (krb5_error_code) krberror.error_code;
1551                         got_error_code = True;
1552                 }
1553
1554                 smb_krb5_free_error(context, &krberror);
1555         }
1556 #else /* MIT */
1557         {
1558                 krb5_error *krberror;
1559
1560                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1561                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1562                                 error_message(ret)));
1563                         return ret;
1564                 }
1565
1566                 if (krberror->e_data.data == NULL) {
1567 #if defined(ERROR_TABLE_BASE_krb5)
1568                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1569 #else
1570                         ret = (krb5_error_code)krberror->error;
1571 #endif
1572                         got_error_code = True;
1573                 }
1574                 smb_krb5_free_error(context, krberror);
1575         }
1576 #endif
1577         if (got_error_code) {
1578                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1579                         error_message(ret), ret));
1580         }
1581         return ret;
1582 }
1583
1584  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1585                                             krb5_get_init_creds_opt **opt)
1586 {
1587 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1588         /* Heimdal or modern MIT version */
1589         return krb5_get_init_creds_opt_alloc(context, opt);
1590 #else
1591         /* Historical MIT version */
1592         krb5_get_init_creds_opt *my_opt;
1593
1594         *opt = NULL;
1595
1596         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1597                 return ENOMEM;
1598         }
1599
1600         krb5_get_init_creds_opt_init(my_opt);
1601
1602         *opt =  my_opt;
1603         return 0;
1604 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1605 }
1606
1607  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1608                                 krb5_get_init_creds_opt *opt)
1609 {
1610 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1611
1612 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1613         /* Modern MIT or Heimdal version */
1614         krb5_get_init_creds_opt_free(context, opt);
1615 #else
1616         /* Heimdal version */
1617         krb5_get_init_creds_opt_free(opt);
1618 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1619
1620 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1621         /* Historical MIT version */
1622         SAFE_FREE(opt);
1623         opt = NULL;
1624 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1625 }
1626
1627  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1628 {
1629         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1630 }
1631
1632
1633 /* caller needs to free etype_s */
1634  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1635                                             krb5_enctype enctype,
1636                                             char **etype_s)
1637 {
1638 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1639         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1640 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1641         char buf[256];
1642         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1643         if (ret) {
1644                 return ret;
1645         }
1646         *etype_s = SMB_STRDUP(buf);
1647         if (!*etype_s) {
1648                 return ENOMEM;
1649         }
1650         return ret;
1651 #else
1652 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1653 #endif
1654 }
1655
1656  krb5_error_code smb_krb5_mk_error(krb5_context context,
1657                                 krb5_error_code error_code,
1658                                 const krb5_principal server,
1659                                 krb5_data *reply)
1660 {
1661 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1662         /*
1663          * The MIT interface is *terrible*.
1664          * We have to construct this ourselves...
1665          */
1666         krb5_error e;
1667
1668         memset(&e, 0, sizeof(e));
1669         krb5_us_timeofday(context, &e.stime, &e.susec);
1670         e.server = server;
1671 #if defined(krb5_err_base)
1672         e.error = error_code - krb5_err_base;
1673 #elif defined(ERROR_TABLE_BASE_krb5)
1674         e.error = error_code - ERROR_TABLE_BASE_krb5;
1675 #else
1676         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1677 #endif
1678
1679         return krb5_mk_error(context, &e, reply);
1680 #else /* Heimdal. */
1681         return krb5_mk_error(context,
1682                                 error_code,
1683                                 NULL,
1684                                 NULL, /* e_data */
1685                                 NULL,
1686                                 server,
1687                                 NULL,
1688                                 NULL,
1689                                 reply);
1690 #endif
1691 }
1692
1693 /**********************************************************************
1694  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1695  * allows to process non-default keytab names.
1696  * @param context krb5_context
1697  * @param keytab_name_req string
1698  * @param write_access bool if writable keytab is required
1699  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1700  * @return krb5_error_code
1701 **********************************************************************/
1702
1703 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1704 #ifndef MAX_KEYTAB_NAME_LEN
1705 #define MAX_KEYTAB_NAME_LEN 1100
1706 #endif
1707
1708  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1709                                       const char *keytab_name_req,
1710                                       bool write_access,
1711                                       krb5_keytab *keytab)
1712 {
1713         krb5_error_code ret = 0;
1714         TALLOC_CTX *mem_ctx;
1715         char keytab_string[MAX_KEYTAB_NAME_LEN];
1716         char *kt_str = NULL;
1717         bool found_valid_name = False;
1718         const char *pragma = "FILE";
1719         const char *tmp = NULL;
1720
1721         if (!write_access && !keytab_name_req) {
1722                 /* caller just wants to read the default keytab readonly, so be it */
1723                 return krb5_kt_default(context, keytab);
1724         }
1725
1726         mem_ctx = talloc_init("smb_krb5_open_keytab");
1727         if (!mem_ctx) {
1728                 return ENOMEM;
1729         }
1730
1731 #ifdef HAVE_WRFILE_KEYTAB
1732         if (write_access) {
1733                 pragma = "WRFILE";
1734         }
1735 #endif
1736
1737         if (keytab_name_req) {
1738
1739                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1740                         ret = KRB5_CONFIG_NOTENUFSPACE;
1741                         goto out;
1742                 }
1743
1744                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1745                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1746                         tmp = keytab_name_req;
1747                         goto resolve;
1748                 }
1749
1750                 if (keytab_name_req[0] != '/') {
1751                         ret = KRB5_KT_BADNAME;
1752                         goto out;
1753                 }
1754
1755                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1756                 if (!tmp) {
1757                         ret = ENOMEM;
1758                         goto out;
1759                 }
1760
1761                 goto resolve;
1762         }
1763
1764         /* we need to handle more complex keytab_strings, like:
1765          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1766
1767         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1768         if (ret) {
1769                 goto out;
1770         }
1771
1772         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1773
1774         tmp = talloc_strdup(mem_ctx, keytab_string);
1775         if (!tmp) {
1776                 ret = ENOMEM;
1777                 goto out;
1778         }
1779
1780         if (strncmp(tmp, "ANY:", 4) == 0) {
1781                 tmp += 4;
1782         }
1783
1784         memset(&keytab_string, '\0', sizeof(keytab_string));
1785
1786         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1787                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1788                         found_valid_name = True;
1789                         tmp = kt_str;
1790                         tmp += 7;
1791                 }
1792
1793                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1794                         found_valid_name = True;
1795                         tmp = kt_str;
1796                         tmp += 5;
1797                 }
1798
1799                 if (tmp[0] == '/') {
1800                         /* Treat as a FILE: keytab definition. */
1801                         found_valid_name = true;
1802                 }
1803
1804                 if (found_valid_name) {
1805                         if (tmp[0] != '/') {
1806                                 ret = KRB5_KT_BADNAME;
1807                                 goto out;
1808                         }
1809
1810                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1811                         if (!tmp) {
1812                                 ret = ENOMEM;
1813                                 goto out;
1814                         }
1815                         break;
1816                 }
1817         }
1818
1819         if (!found_valid_name) {
1820                 ret = KRB5_KT_UNKNOWN_TYPE;
1821                 goto out;
1822         }
1823
1824  resolve:
1825         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1826         ret = krb5_kt_resolve(context, tmp, keytab);
1827
1828  out:
1829         TALLOC_FREE(mem_ctx);
1830         return ret;
1831 }
1832
1833 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1834                                      krb5_context context,
1835                                      krb5_keytab keytab,
1836                                      const char **keytab_name)
1837 {
1838         char keytab_string[MAX_KEYTAB_NAME_LEN];
1839         krb5_error_code ret = 0;
1840
1841         ret = krb5_kt_get_name(context, keytab,
1842                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1843         if (ret) {
1844                 return ret;
1845         }
1846
1847         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1848         if (!*keytab_name) {
1849                 return ENOMEM;
1850         }
1851
1852         return ret;
1853 }
1854
1855 #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)
1856 /**************************************************************
1857 Routine: ads_krb5_get_fwd_ticket
1858  Description:
1859     When a service ticket is flagged as trusted
1860     for delegation we should provide a forwardable
1861     ticket so that the remote host can act on our
1862     behalf.  This is done by taking the 2nd forwardable
1863     TGT and storing it in the GSS-API authenticator
1864     "checksum".  This routine will populate
1865     the krb5_data authenticator with this TGT.
1866  Parameters:
1867     krb5_context context: The kerberos context for this authentication.
1868     krb5_auth_context:    The authentication context.
1869     krb5_creds *credsp:   The ticket credentials (AS-REP).
1870     krb5_ccache ccache:   The credentials cache.
1871     krb5_data &authenticator: The checksum field that will store the TGT, and
1872      authenticator.data must be freed by the caller.
1873
1874  Returns:
1875     krb5_error_code: 0 if no errors, otherwise set.
1876 **************************************************************/
1877
1878 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1879                                          krb5_auth_context *auth_context,
1880                                          krb5_creds *credsp,
1881                                          krb5_ccache ccache,
1882                                          krb5_data *authenticator)
1883 {
1884         krb5_data fwdData;
1885         krb5_error_code retval = 0;
1886         char *pChksum = NULL;
1887         char *p = NULL;
1888
1889 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
1890    but still has the symbol */
1891 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
1892 krb5_error_code krb5_auth_con_set_req_cksumtype(
1893         krb5_context     context,
1894         krb5_auth_context      auth_context,
1895         krb5_cksumtype     cksumtype);
1896 #endif
1897
1898         ZERO_STRUCT(fwdData);
1899         ZERO_STRUCTP(authenticator);
1900
1901         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1902                                 *auth_context,  /* Authentication context [in] */
1903                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
1904                                 credsp->client, /* Client principal for the tgt [in] */
1905                                 credsp->server, /* Server principal for the tgt [in] */
1906                                 ccache,         /* Credential cache to use for storage [in] */
1907                                 1,              /* Turn on for "Forwardable ticket" [in] */
1908                                 &fwdData );     /* Resulting response [out] */
1909
1910
1911         if (retval) {
1912                 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1913                         error_message(retval)));
1914                 goto out;
1915         }
1916
1917         if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1918                 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1919                 retval = EINVAL;
1920                 goto out;
1921         }
1922
1923         /* We're going to allocate a gssChecksum structure with a little
1924            extra data the length of the kerberos credentials length
1925            (APPLICATION 22) so that we can pack it on the end of the structure.
1926         */
1927
1928         pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1929         if (!pChksum) {
1930                 retval = ENOMEM;
1931                 goto out;
1932         }
1933
1934         p = pChksum;
1935
1936         SIVAL(p, 0, GSSAPI_BNDLENGTH);
1937         p += 4;
1938
1939         /* Zero out the bindings fields */
1940         memset(p, '\0', GSSAPI_BNDLENGTH );
1941         p += GSSAPI_BNDLENGTH;
1942
1943         SIVAL(p, 0, GSS_C_DELEG_FLAG );
1944         p += 4;
1945         SSVAL(p, 0, 1 );
1946         p += 2;
1947         SSVAL(p, 0, fwdData.length );
1948         p += 2;
1949
1950         /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1951         memcpy(p, fwdData.data, fwdData.length );
1952         p += fwdData.length;
1953
1954         /* We need to do this in order to allow our GSS-API  */
1955         retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1956         if (retval) {
1957                 goto out;
1958         }
1959
1960         /* We now have a service ticket, now turn it into an AP-REQ. */
1961         authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1962
1963         /* Caller should call free() when they're done with this. */
1964         authenticator->data = (char *)pChksum;
1965
1966   out:
1967
1968         /* Remove that input data, we never needed it anyway. */
1969         if (fwdData.length > 0) {
1970                 krb5_free_data_contents( context, &fwdData );
1971         }
1972
1973         return retval;
1974 }
1975 #endif
1976
1977 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1978     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1979     defined(HAVE_KRB5_GET_CREDS)
1980 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1981                                                              krb5_ccache ccache,
1982                                                              krb5_principal me,
1983                                                              krb5_principal server,
1984                                                              krb5_principal impersonate_princ,
1985                                                              krb5_creds **out_creds)
1986 {
1987         krb5_error_code ret;
1988         krb5_get_creds_opt opt;
1989
1990         ret = krb5_get_creds_opt_alloc(context, &opt);
1991         if (ret) {
1992                 goto done;
1993         }
1994         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1995
1996         if (impersonate_princ) {
1997                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1998                                                          impersonate_princ);
1999                 if (ret) {
2000                         goto done;
2001                 }
2002         }
2003
2004         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2005         if (ret) {
2006                 goto done;
2007         }
2008
2009  done:
2010         if (opt) {
2011                 krb5_get_creds_opt_free(context, opt);
2012         }
2013         return ret;
2014 }
2015 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2016
2017 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2018 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2019                                                          krb5_ccache ccache,
2020                                                          krb5_principal me,
2021                                                          krb5_principal server,
2022                                                          krb5_principal impersonate_princ,
2023                                                          krb5_creds **out_creds)
2024 {
2025         krb5_error_code ret;
2026         krb5_creds in_creds;
2027
2028 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2029 krb5_error_code KRB5_CALLCONV
2030 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2031                               krb5_ccache ccache, krb5_creds *in_creds,
2032                               krb5_data *subject_cert,
2033                               krb5_creds **out_creds);
2034 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2035
2036         ZERO_STRUCT(in_creds);
2037
2038         if (impersonate_princ) {
2039
2040                 in_creds.server = me;
2041                 in_creds.client = impersonate_princ;
2042
2043                 ret = krb5_get_credentials_for_user(context,
2044                                                     0, /* krb5_flags options */
2045                                                     ccache,
2046                                                     &in_creds,
2047                                                     NULL, /* krb5_data *subject_cert */
2048                                                     out_creds);
2049         } else {
2050                 in_creds.client = me;
2051                 in_creds.server = server;
2052
2053                 ret = krb5_get_credentials(context, 0, ccache,
2054                                            &in_creds, out_creds);
2055         }
2056
2057         return ret;
2058 }
2059 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2060
2061 /*
2062  * smb_krb5_get_credentials
2063  *
2064  * @brief Get krb5 credentials for a server
2065  *
2066  * @param[in] context           An initialized krb5_context
2067  * @param[in] ccache            An initialized krb5_ccache
2068  * @param[in] me                The krb5_principal of the caller
2069  * @param[in] server            The krb5_principal of the requested service
2070  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2071  * @param[out] out_creds        The returned krb5_creds structure
2072  * @return krb5_error_code
2073  *
2074  */
2075 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2076                                          krb5_ccache ccache,
2077                                          krb5_principal me,
2078                                          krb5_principal server,
2079                                          krb5_principal impersonate_princ,
2080                                          krb5_creds **out_creds)
2081 {
2082         krb5_error_code ret;
2083         krb5_creds *creds = NULL;
2084
2085         *out_creds = NULL;
2086
2087         if (impersonate_princ) {
2088 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2089                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2090 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2091                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2092 #else
2093                 ret = ENOTSUP;
2094 #endif
2095         } else {
2096                 krb5_creds in_creds;
2097
2098                 ZERO_STRUCT(in_creds);
2099
2100                 in_creds.client = me;
2101                 in_creds.server = server;
2102
2103                 ret = krb5_get_credentials(context, 0, ccache,
2104                                            &in_creds, &creds);
2105         }
2106         if (ret) {
2107                 goto done;
2108         }
2109
2110         ret = krb5_cc_store_cred(context, ccache, creds);
2111         if (ret) {
2112                 goto done;
2113         }
2114
2115         if (out_creds) {
2116                 *out_creds = creds;
2117         }
2118
2119  done:
2120         if (creds && ret) {
2121                 krb5_free_creds(context, creds);
2122         }
2123
2124         return ret;
2125 }
2126
2127 /*
2128  * smb_krb5_get_creds
2129  *
2130  * @brief Get krb5 credentials for a server
2131  *
2132  * @param[in] server_s          The string name of the service
2133  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2134  * @param[in] cc                The krb5 credential cache string name (optional)
2135  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2136  * @param[out] creds_p          The returned krb5_creds structure
2137  * @return krb5_error_code
2138  *
2139  */
2140 krb5_error_code smb_krb5_get_creds(const char *server_s,
2141                                    time_t time_offset,
2142                                    const char *cc,
2143                                    const char *impersonate_princ_s,
2144                                    krb5_creds **creds_p)
2145 {
2146         krb5_error_code ret;
2147         krb5_context context = NULL;
2148         krb5_principal me = NULL;
2149         krb5_principal server = NULL;
2150         krb5_principal impersonate_princ = NULL;
2151         krb5_creds *creds = NULL;
2152         krb5_ccache ccache = NULL;
2153
2154         *creds_p = NULL;
2155
2156         initialize_krb5_error_table();
2157         ret = krb5_init_context(&context);
2158         if (ret) {
2159                 goto done;
2160         }
2161
2162         if (time_offset != 0) {
2163                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2164         }
2165
2166         ret = krb5_cc_resolve(context, cc ? cc :
2167                 krb5_cc_default_name(context), &ccache);
2168         if (ret) {
2169                 goto done;
2170         }
2171
2172         ret = krb5_cc_get_principal(context, ccache, &me);
2173         if (ret) {
2174                 goto done;
2175         }
2176
2177         ret = smb_krb5_parse_name(context, server_s, &server);
2178         if (ret) {
2179                 goto done;
2180         }
2181
2182         if (impersonate_princ_s) {
2183                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2184                                           &impersonate_princ);
2185                 if (ret) {
2186                         goto done;
2187                 }
2188         }
2189
2190         ret = smb_krb5_get_credentials(context, ccache,
2191                                        me, server, impersonate_princ,
2192                                        &creds);
2193         if (ret) {
2194                 goto done;
2195         }
2196
2197         ret = krb5_cc_store_cred(context, ccache, creds);
2198         if (ret) {
2199                 goto done;
2200         }
2201
2202         if (creds_p) {
2203                 *creds_p = creds;
2204         }
2205
2206         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2207                 server_s));
2208
2209         if (impersonate_princ_s) {
2210                 char *client = NULL;
2211
2212                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2213                 if (ret) {
2214                         goto done;
2215                 }
2216                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2217                         client));
2218                 TALLOC_FREE(client);
2219         }
2220
2221  done:
2222         if (!context) {
2223                 return ret;
2224         }
2225
2226         if (creds && ret) {
2227                 krb5_free_creds(context, creds);
2228         }
2229         if (server) {
2230                 krb5_free_principal(context, server);
2231         }
2232         if (me) {
2233                 krb5_free_principal(context, me);
2234         }
2235         if (impersonate_princ) {
2236                 krb5_free_principal(context, impersonate_princ);
2237         }
2238         if (ccache) {
2239                 krb5_cc_close(context, ccache);
2240         }
2241         krb5_free_context(context);
2242
2243         return ret;
2244 }
2245
2246 /*
2247  * smb_krb5_principal_get_realm
2248  *
2249  * @brief Get realm of a principal
2250  *
2251  * @param[in] context           The krb5_context
2252  * @param[in] principal         The principal
2253  * @return pointer to the realm
2254  *
2255  */
2256
2257 char *smb_krb5_principal_get_realm(krb5_context context,
2258                                    krb5_principal principal)
2259 {
2260 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2261         return krb5_principal_get_realm(context, principal);
2262 #elif defined(krb5_princ_realm) /* MIT */
2263         krb5_data *realm;
2264         realm = krb5_princ_realm(context, principal);
2265         return (char *)realm->data;
2266 #else
2267         return NULL;
2268 #endif
2269 }
2270
2271 #else /* HAVE_KRB5 */
2272  /* this saves a few linking headaches */
2273  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
2274                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
2275                         const char *ccname, time_t *tgs_expire,
2276                         const char *impersonate_princ_s)
2277 {
2278          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2279          return 1;
2280 }
2281
2282 #endif