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,
 905                               krb5_auth_context auth_context,
 906                               DATA_BLOB *session_key, bool remote)
 907 {
 908         krb5_keyblock *skey = NULL;
 909         krb5_error_code err = 0;
 910         bool ret = false;
 911
 912         if (remote) {
 913                 err = krb5_auth_con_getremotesubkey(context,
 914                                                     auth_context, &skey);
 915         } else {
 916                 err = krb5_auth_con_getlocalsubkey(context,
 917                                                    auth_context, &skey);
 918         }
 919
 920         if (err || skey == NULL) {
 921                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 922                 goto done;
 923         }
 924
 925         DEBUG(10, ("Got KRB5 session key of length %d\n",
 926                    (int)KRB5_KEY_LENGTH(skey)));
 927
 928         *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 929         dump_data_pw("KRB5 Session Key:\n",
 930                         session_key->data, session_key->length);
 931
 932         ret = true;
 933
 934 done:
 935         if (skey) {
 936                 krb5_free_keyblock(context, skey);
 937         }
 938
 939         return ret;
 940 }
 941
 942
 943 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 944  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 945
 946  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 947 {
 948         static krb5_data kdata;
 949
 950         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 951         kdata.length = strlen((const char *)kdata.data);
 952         return &kdata;
 953 }
 954 #endif
 955
 956  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 957 {
 958 /* Try krb5_free_keytab_entry_contents first, since
 959  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 960  * krb5_kt_free_entry but only has a prototype for the first, while the
 961  * second is considered private.
 962  */
 963 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 964         return krb5_free_keytab_entry_contents(context, kt_entry);
 965 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
 966         return krb5_kt_free_entry(context, kt_entry);
 967 #else
 968 #error UNKNOWN_KT_FREE_FUNCTION
 969 #endif
 970 }
 971
 972  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 973                                      struct PAC_SIGNATURE_DATA *sig)
 974 {
 975 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 976         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 977         cksum->checksum.length  = sig->signature.length;
 978         cksum->checksum.data    = sig->signature.data;
 979 #else
 980         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 981         cksum->length           = sig->signature.length;
 982         cksum->contents         = sig->signature.data;
 983 #endif
 984 }
 985
 986  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 987                                           const krb5_keyblock *keyblock,
 988                                          krb5_keyusage usage,
 989                                          krb5_checksum *cksum,
 990                                          uint8 *data,
 991                                          size_t length)
 992 {
 993         krb5_error_code ret;
 994
 995         /* verify the checksum */
 996
 997         /* welcome to the wonderful world of samba's kerberos abstraction layer:
 998          *
 999          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
1000          * -----------------------------------------------------------------------------
1001          * krb5_c_verify_checksum       -                       works           works
1002          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
1003          */
1004
1005 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1006         {
1007                 krb5_boolean checksum_valid = False;
1008                 krb5_data input;
1009
1010                 input.data = (char *)data;
1011                 input.length = length;
1012
1013                 ret = krb5_c_verify_checksum(context,
1014                                              keyblock,
1015                                              usage,
1016                                              &input,
1017                                              cksum,
1018                                              &checksum_valid);
1019                 if (ret) {
1020                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1021                                 error_message(ret)));
1022                         return ret;
1023                 }
1024
1025                 if (!checksum_valid)
1026                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1027         }
1028
1029 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1030
1031         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1032          * without enctype and it ignores any key_usage types - Guenther */
1033
1034         {
1035
1036                 krb5_crypto crypto;
1037                 ret = krb5_crypto_init(context,
1038                                        keyblock,
1039                                        0,
1040                                        &crypto);
1041                 if (ret) {
1042                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1043                                 error_message(ret)));
1044                         return ret;
1045                 }
1046
1047                 ret = krb5_verify_checksum(context,
1048                                            crypto,
1049                                            usage,
1050                                            data,
1051                                            length,
1052                                            cksum);
1053
1054                 krb5_crypto_destroy(context, crypto);
1055         }
1056
1057 #else
1058 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1059 #endif
1060
1061         return ret;
1062 }
1063
1064  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1065 {
1066 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1067         return tkt->enc_part2->times.authtime;
1068 #else
1069         return tkt->ticket.authtime;
1070 #endif
1071 }
1072
1073 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1074 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1075 {
1076 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1077         if (ap_req->ticket->enc_part.kvno)
1078                 return ap_req->ticket->enc_part.kvno;
1079 #else /* Heimdal */
1080         if (ap_req->ticket.enc_part.kvno)
1081                 return *ap_req->ticket.enc_part.kvno;
1082 #endif
1083         return 0;
1084 }
1085
1086 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1087 {
1088 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1089         return ap_req->ticket.enc_part.etype;
1090 #else /* MIT */
1091         return ap_req->ticket->enc_part.enctype;
1092 #endif
1093 }
1094 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1095
1096 static krb5_error_code
1097 get_key_from_keytab(krb5_context context,
1098                     krb5_const_principal server,
1099                     krb5_enctype enctype,
1100                     krb5_kvno kvno,
1101                     krb5_keyblock **out_key)
1102 {
1103         krb5_keytab_entry entry;
1104         krb5_error_code ret;
1105         krb5_keytab keytab;
1106         char *name = NULL;
1107         krb5_keyblock *keyp;
1108
1109         /* We have to open a new keytab handle here, as MIT does
1110            an implicit open/getnext/close on krb5_kt_get_entry. We
1111            may be in the middle of a keytab enumeration when this is
1112            called. JRA. */
1113
1114         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1115         if (ret) {
1116                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1117                 return ret;
1118         }
1119
1120         if ( DEBUGLEVEL >= 10 ) {
1121                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1122                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1123                                 kvno, enctype, name));
1124                         TALLOC_FREE(name);
1125                 }
1126         }
1127
1128         ret = krb5_kt_get_entry(context,
1129                                 keytab,
1130                                 server,
1131                                 kvno,
1132                                 enctype,
1133                                 &entry);
1134
1135         if (ret) {
1136                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1137                 goto out;
1138         }
1139
1140         keyp = KRB5_KT_KEY(&entry);
1141
1142         ret = krb5_copy_keyblock(context, keyp, out_key);
1143         if (ret) {
1144                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1145                 goto out;
1146         }
1147
1148         smb_krb5_kt_free_entry(context, &entry);
1149
1150 out:
1151         krb5_kt_close(context, keytab);
1152         return ret;
1153 }
1154
1155 /* Prototypes */
1156
1157  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1158                                                  const krb5_data *inbuf,
1159                                                  krb5_kvno *kvno,
1160                                                  krb5_enctype *enctype)
1161 {
1162 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1163         {
1164                 krb5_error_code ret;
1165                 krb5_ap_req ap_req;
1166
1167                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1168                 if (ret)
1169                         return ret;
1170
1171                 *kvno = get_kvno_from_ap_req(&ap_req);
1172                 *enctype = get_enctype_from_ap_req(&ap_req);
1173
1174                 free_AP_REQ(&ap_req);
1175                 return 0;
1176         }
1177 #endif
1178
1179         /* Possibly not an appropriate error code. */
1180         return KRB5KDC_ERR_BADOPTION;
1181 }
1182
1183  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1184                                                         krb5_auth_context *auth_context,
1185                                                         const krb5_data *inbuf,
1186                                                         krb5_const_principal server,
1187                                                         krb5_keytab keytab,
1188                                                         krb5_flags *ap_req_options,
1189                                                         krb5_ticket **ticket,
1190                                                         krb5_keyblock **keyblock)
1191 {
1192         krb5_error_code ret;
1193         krb5_kvno kvno;
1194         krb5_enctype enctype;
1195         krb5_keyblock *local_keyblock;
1196
1197         ret = krb5_rd_req(context,
1198                           auth_context,
1199                           inbuf,
1200                           server,
1201                           keytab,
1202                           ap_req_options,
1203                           ticket);
1204         if (ret) {
1205                 return ret;
1206         }
1207
1208 #ifdef KRB5_TICKET_HAS_KEYINFO
1209         enctype = (*ticket)->enc_part.enctype;
1210         kvno = (*ticket)->enc_part.kvno;
1211 #else
1212         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1213         if (ret) {
1214                 return ret;
1215         }
1216 #endif
1217
1218         ret = get_key_from_keytab(context,
1219                                   server,
1220                                   enctype,
1221                                   kvno,
1222                                   &local_keyblock);
1223         if (ret) {
1224                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1225                 goto out;
1226         }
1227
1228 out:
1229         if (ret && local_keyblock != NULL) {
1230                 krb5_free_keyblock(context, local_keyblock);
1231         } else {
1232                 *keyblock = local_keyblock;
1233         }
1234
1235         return ret;
1236 }
1237
1238  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1239                                             const char *name,
1240                                             krb5_principal *principal)
1241 {
1242 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1243         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1244 #endif
1245
1246         /* we are cheating here because parse_name will in fact set the realm.
1247          * We don't care as the only caller of smb_krb5_parse_name_norealm
1248          * ignores the realm anyway when calling
1249          * smb_krb5_principal_compare_any_realm later - Guenther */
1250
1251         return smb_krb5_parse_name(context, name, principal);
1252 }
1253
1254  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1255                                           krb5_const_principal princ1,
1256                                           krb5_const_principal princ2)
1257 {
1258 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1259
1260         return krb5_principal_compare_any_realm(context, princ1, princ2);
1261
1262 /* krb5_princ_size is a macro in MIT */
1263 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1264
1265         int i, len1, len2;
1266         const krb5_data *p1, *p2;
1267
1268         len1 = krb5_princ_size(context, princ1);
1269         len2 = krb5_princ_size(context, princ2);
1270
1271         if (len1 != len2)
1272                 return False;
1273
1274         for (i = 0; i < len1; i++) {
1275
1276                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1277                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1278
1279                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1280                         return False;
1281         }
1282
1283         return True;
1284 #else
1285 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1286 #endif
1287 }
1288
1289  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1290                                        const char *client_string,       /* gd@BER.SUSE.DE */
1291                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1292                                        time_t *expire_time)
1293 {
1294         krb5_error_code ret;
1295         krb5_context context = NULL;
1296         krb5_ccache ccache = NULL;
1297         krb5_principal client = NULL;
1298         krb5_creds creds, creds_in, *creds_out = NULL;
1299
1300         ZERO_STRUCT(creds);
1301         ZERO_STRUCT(creds_in);
1302
1303         initialize_krb5_error_table();
1304         ret = krb5_init_context(&context);
1305         if (ret) {
1306                 goto done;
1307         }
1308
1309         if (!ccache_string) {
1310                 ccache_string = krb5_cc_default_name(context);
1311         }
1312
1313         if (!ccache_string) {
1314                 ret = EINVAL;
1315                 goto done;
1316         }
1317
1318         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1319
1320         /* FIXME: we should not fall back to defaults */
1321         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1322         if (ret) {
1323                 goto done;
1324         }
1325
1326         if (client_string) {
1327                 ret = smb_krb5_parse_name(context, client_string, &client);
1328                 if (ret) {
1329                         goto done;
1330                 }
1331         } else {
1332                 ret = krb5_cc_get_principal(context, ccache, &client);
1333                 if (ret) {
1334                         goto done;
1335                 }
1336         }
1337
1338 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1339         {
1340                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1341                 if (ret) {
1342                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1343                         goto done;
1344                 }
1345         }
1346 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1347         {
1348                 krb5_kdc_flags flags;
1349                 krb5_realm *client_realm = NULL;
1350
1351                 ret = krb5_copy_principal(context, client, &creds_in.client);
1352                 if (ret) {
1353                         goto done;
1354                 }
1355
1356                 if (service_string) {
1357                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1358                         if (ret) {
1359                                 goto done;
1360                         }
1361                 } else {
1362                         /* build tgt service by default */
1363                         client_realm = krb5_princ_realm(context, creds_in.client);
1364                         if (!client_realm) {
1365                                 ret = ENOMEM;
1366                                 goto done;
1367                         }
1368                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1369                         if (ret) {
1370                                 goto done;
1371                         }
1372                 }
1373
1374                 flags.i = 0;
1375                 flags.b.renewable = flags.b.renew = True;
1376
1377                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1378                 if (ret) {
1379                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1380                         goto done;
1381                 }
1382
1383                 creds = *creds_out;
1384         }
1385 #else
1386 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1387 #endif
1388
1389         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1390         ret = krb5_cc_initialize(context, ccache, client);
1391         if (ret) {
1392                 goto done;
1393         }
1394
1395         ret = krb5_cc_store_cred(context, ccache, &creds);
1396
1397         if (expire_time) {
1398                 *expire_time = (time_t) creds.times.endtime;
1399         }
1400
1401 done:
1402         krb5_free_cred_contents(context, &creds_in);
1403
1404         if (creds_out) {
1405                 krb5_free_creds(context, creds_out);
1406         } else {
1407                 krb5_free_cred_contents(context, &creds);
1408         }
1409
1410         if (client) {
1411                 krb5_free_principal(context, client);
1412         }
1413         if (ccache) {
1414                 krb5_cc_close(context, ccache);
1415         }
1416         if (context) {
1417                 krb5_free_context(context);
1418         }
1419
1420         return ret;
1421 }
1422
1423  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1424 {
1425         krb5_error_code ret = 0;
1426         if (addr == NULL) {
1427                 return ret;
1428         }
1429 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1430         krb5_free_addresses(context, addr->addrs);
1431 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1432         ret = krb5_free_addresses(context, addr->addrs);
1433         SAFE_FREE(addr->addrs);
1434 #endif
1435         SAFE_FREE(addr);
1436         addr = NULL;
1437         return ret;
1438 }
1439
1440  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1441 {
1442         krb5_error_code ret = 0;
1443         nstring buf;
1444 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1445         krb5_address **addrs = NULL;
1446 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1447         krb5_addresses *addrs = NULL;
1448 #endif
1449
1450         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1451         if (*kerb_addr == NULL) {
1452                 return ENOMEM;
1453         }
1454
1455         put_name(buf, global_myname(), ' ', 0x20);
1456
1457 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1458         {
1459                 int num_addr = 2;
1460
1461                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1462                 if (addrs == NULL) {
1463                         SAFE_FREE(*kerb_addr);
1464                         return ENOMEM;
1465                 }
1466
1467                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1468
1469                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1470                 if (addrs[0] == NULL) {
1471                         SAFE_FREE(addrs);
1472                         SAFE_FREE(*kerb_addr);
1473                         return ENOMEM;
1474                 }
1475
1476                 addrs[0]->magic = KV5M_ADDRESS;
1477                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1478                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1479                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1480                 if (addrs[0]->contents == NULL) {
1481                         SAFE_FREE(addrs[0]);
1482                         SAFE_FREE(addrs);
1483                         SAFE_FREE(*kerb_addr);
1484                         return ENOMEM;
1485                 }
1486
1487                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1488
1489                 addrs[1] = NULL;
1490         }
1491 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1492         {
1493                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1494                 if (addrs == NULL) {
1495                         SAFE_FREE(*kerb_addr);
1496                         return ENOMEM;
1497                 }
1498
1499                 memset(addrs, 0, sizeof(krb5_addresses));
1500
1501                 addrs->len = 1;
1502                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1503                 if (addrs->val == NULL) {
1504                         SAFE_FREE(addrs);
1505                         SAFE_FREE(kerb_addr);
1506                         return ENOMEM;
1507                 }
1508
1509                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1510                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1511                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1512                 if (addrs->val[0].address.data == NULL) {
1513                         SAFE_FREE(addrs->val);
1514                         SAFE_FREE(addrs);
1515                         SAFE_FREE(*kerb_addr);
1516                         return ENOMEM;
1517                 }
1518
1519                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1520         }
1521 #else
1522 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1523 #endif
1524         (*kerb_addr)->addrs = addrs;
1525
1526         return ret;
1527 }
1528
1529  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1530 {
1531 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1532         krb5_free_error_contents(context, krberror);
1533 #else /* MIT */
1534         krb5_free_error(context, krberror);
1535 #endif
1536 }
1537
1538  krb5_error_code handle_krberror_packet(krb5_context context,
1539                                         krb5_data *packet)
1540 {
1541         krb5_error_code ret;
1542         bool got_error_code = False;
1543
1544         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1545
1546 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1547         {
1548                 krb5_error krberror;
1549
1550                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1551                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1552                                 error_message(ret)));
1553                         return ret;
1554                 }
1555
1556                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1557                         ret = (krb5_error_code) krberror.error_code;
1558                         got_error_code = True;
1559                 }
1560
1561                 smb_krb5_free_error(context, &krberror);
1562         }
1563 #else /* MIT */
1564         {
1565                 krb5_error *krberror;
1566
1567                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1568                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1569                                 error_message(ret)));
1570                         return ret;
1571                 }
1572
1573                 if (krberror->e_data.data == NULL) {
1574 #if defined(ERROR_TABLE_BASE_krb5)
1575                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1576 #else
1577                         ret = (krb5_error_code)krberror->error;
1578 #endif
1579                         got_error_code = True;
1580                 }
1581                 smb_krb5_free_error(context, krberror);
1582         }
1583 #endif
1584         if (got_error_code) {
1585                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1586                         error_message(ret), ret));
1587         }
1588         return ret;
1589 }
1590
1591  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1592                                             krb5_get_init_creds_opt **opt)
1593 {
1594 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1595         /* Heimdal or modern MIT version */
1596         return krb5_get_init_creds_opt_alloc(context, opt);
1597 #else
1598         /* Historical MIT version */
1599         krb5_get_init_creds_opt *my_opt;
1600
1601         *opt = NULL;
1602
1603         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1604                 return ENOMEM;
1605         }
1606
1607         krb5_get_init_creds_opt_init(my_opt);
1608
1609         *opt =  my_opt;
1610         return 0;
1611 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1612 }
1613
1614  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1615                                 krb5_get_init_creds_opt *opt)
1616 {
1617 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1618
1619 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1620         /* Modern MIT or Heimdal version */
1621         krb5_get_init_creds_opt_free(context, opt);
1622 #else
1623         /* Heimdal version */
1624         krb5_get_init_creds_opt_free(opt);
1625 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1626
1627 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1628         /* Historical MIT version */
1629         SAFE_FREE(opt);
1630         opt = NULL;
1631 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1632 }
1633
1634  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1635 {
1636         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1637 }
1638
1639
1640 /* caller needs to free etype_s */
1641  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1642                                             krb5_enctype enctype,
1643                                             char **etype_s)
1644 {
1645 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1646         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1647 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1648         char buf[256];
1649         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1650         if (ret) {
1651                 return ret;
1652         }
1653         *etype_s = SMB_STRDUP(buf);
1654         if (!*etype_s) {
1655                 return ENOMEM;
1656         }
1657         return ret;
1658 #else
1659 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1660 #endif
1661 }
1662
1663  krb5_error_code smb_krb5_mk_error(krb5_context context,
1664                                 krb5_error_code error_code,
1665                                 const krb5_principal server,
1666                                 krb5_data *reply)
1667 {
1668 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1669         /*
1670          * The MIT interface is *terrible*.
1671          * We have to construct this ourselves...
1672          */
1673         krb5_error e;
1674
1675         memset(&e, 0, sizeof(e));
1676         krb5_us_timeofday(context, &e.stime, &e.susec);
1677         e.server = server;
1678 #if defined(krb5_err_base)
1679         e.error = error_code - krb5_err_base;
1680 #elif defined(ERROR_TABLE_BASE_krb5)
1681         e.error = error_code - ERROR_TABLE_BASE_krb5;
1682 #else
1683         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1684 #endif
1685
1686         return krb5_mk_error(context, &e, reply);
1687 #else /* Heimdal. */
1688         return krb5_mk_error(context,
1689                                 error_code,
1690                                 NULL,
1691                                 NULL, /* e_data */
1692                                 NULL,
1693                                 server,
1694                                 NULL,
1695                                 NULL,
1696                                 reply);
1697 #endif
1698 }
1699
1700 /**********************************************************************
1701  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1702  * allows to process non-default keytab names.
1703  * @param context krb5_context
1704  * @param keytab_name_req string
1705  * @param write_access bool if writable keytab is required
1706  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1707  * @return krb5_error_code
1708 **********************************************************************/
1709
1710 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1711 #ifndef MAX_KEYTAB_NAME_LEN
1712 #define MAX_KEYTAB_NAME_LEN 1100
1713 #endif
1714
1715  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1716                                       const char *keytab_name_req,
1717                                       bool write_access,
1718                                       krb5_keytab *keytab)
1719 {
1720         krb5_error_code ret = 0;
1721         TALLOC_CTX *mem_ctx;
1722         char keytab_string[MAX_KEYTAB_NAME_LEN];
1723         char *kt_str = NULL;
1724         bool found_valid_name = False;
1725         const char *pragma = "FILE";
1726         const char *tmp = NULL;
1727
1728         if (!write_access && !keytab_name_req) {
1729                 /* caller just wants to read the default keytab readonly, so be it */
1730                 return krb5_kt_default(context, keytab);
1731         }
1732
1733         mem_ctx = talloc_init("smb_krb5_open_keytab");
1734         if (!mem_ctx) {
1735                 return ENOMEM;
1736         }
1737
1738 #ifdef HAVE_WRFILE_KEYTAB
1739         if (write_access) {
1740                 pragma = "WRFILE";
1741         }
1742 #endif
1743
1744         if (keytab_name_req) {
1745
1746                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1747                         ret = KRB5_CONFIG_NOTENUFSPACE;
1748                         goto out;
1749                 }
1750
1751                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1752                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1753                         tmp = keytab_name_req;
1754                         goto resolve;
1755                 }
1756
1757                 if (keytab_name_req[0] != '/') {
1758                         ret = KRB5_KT_BADNAME;
1759                         goto out;
1760                 }
1761
1762                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1763                 if (!tmp) {
1764                         ret = ENOMEM;
1765                         goto out;
1766                 }
1767
1768                 goto resolve;
1769         }
1770
1771         /* we need to handle more complex keytab_strings, like:
1772          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1773
1774         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1775         if (ret) {
1776                 goto out;
1777         }
1778
1779         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1780
1781         tmp = talloc_strdup(mem_ctx, keytab_string);
1782         if (!tmp) {
1783                 ret = ENOMEM;
1784                 goto out;
1785         }
1786
1787         if (strncmp(tmp, "ANY:", 4) == 0) {
1788                 tmp += 4;
1789         }
1790
1791         memset(&keytab_string, '\0', sizeof(keytab_string));
1792
1793         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1794                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1795                         found_valid_name = True;
1796                         tmp = kt_str;
1797                         tmp += 7;
1798                 }
1799
1800                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1801                         found_valid_name = True;
1802                         tmp = kt_str;
1803                         tmp += 5;
1804                 }
1805
1806                 if (tmp[0] == '/') {
1807                         /* Treat as a FILE: keytab definition. */
1808                         found_valid_name = true;
1809                 }
1810
1811                 if (found_valid_name) {
1812                         if (tmp[0] != '/') {
1813                                 ret = KRB5_KT_BADNAME;
1814                                 goto out;
1815                         }
1816
1817                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1818                         if (!tmp) {
1819                                 ret = ENOMEM;
1820                                 goto out;
1821                         }
1822                         break;
1823                 }
1824         }
1825
1826         if (!found_valid_name) {
1827                 ret = KRB5_KT_UNKNOWN_TYPE;
1828                 goto out;
1829         }
1830
1831  resolve:
1832         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1833         ret = krb5_kt_resolve(context, tmp, keytab);
1834
1835  out:
1836         TALLOC_FREE(mem_ctx);
1837         return ret;
1838 }
1839
1840 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1841                                      krb5_context context,
1842                                      krb5_keytab keytab,
1843                                      const char **keytab_name)
1844 {
1845         char keytab_string[MAX_KEYTAB_NAME_LEN];
1846         krb5_error_code ret = 0;
1847
1848         ret = krb5_kt_get_name(context, keytab,
1849                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1850         if (ret) {
1851                 return ret;
1852         }
1853
1854         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1855         if (!*keytab_name) {
1856                 return ENOMEM;
1857         }
1858
1859         return ret;
1860 }
1861
1862 #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)
1863 /**************************************************************
1864 Routine: ads_krb5_get_fwd_ticket
1865  Description:
1866     When a service ticket is flagged as trusted
1867     for delegation we should provide a forwardable
1868     ticket so that the remote host can act on our
1869     behalf.  This is done by taking the 2nd forwardable
1870     TGT and storing it in the GSS-API authenticator
1871     "checksum".  This routine will populate
1872     the krb5_data authenticator with this TGT.
1873  Parameters:
1874     krb5_context context: The kerberos context for this authentication.
1875     krb5_auth_context:    The authentication context.
1876     krb5_creds *credsp:   The ticket credentials (AS-REP).
1877     krb5_ccache ccache:   The credentials cache.
1878     krb5_data &authenticator: The checksum field that will store the TGT, and
1879      authenticator.data must be freed by the caller.
1880
1881  Returns:
1882     krb5_error_code: 0 if no errors, otherwise set.
1883 **************************************************************/
1884
1885 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1886                                          krb5_auth_context *auth_context,
1887                                          krb5_creds *credsp,
1888                                          krb5_ccache ccache,
1889                                          krb5_data *authenticator)
1890 {
1891         krb5_data fwdData;
1892         krb5_error_code retval = 0;
1893         char *pChksum = NULL;
1894         char *p = NULL;
1895
1896 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
1897    but still has the symbol */
1898 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
1899 krb5_error_code krb5_auth_con_set_req_cksumtype(
1900         krb5_context     context,
1901         krb5_auth_context      auth_context,
1902         krb5_cksumtype     cksumtype);
1903 #endif
1904
1905         ZERO_STRUCT(fwdData);
1906         ZERO_STRUCTP(authenticator);
1907
1908         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1909                                 *auth_context,  /* Authentication context [in] */
1910                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
1911                                 credsp->client, /* Client principal for the tgt [in] */
1912                                 credsp->server, /* Server principal for the tgt [in] */
1913                                 ccache,         /* Credential cache to use for storage [in] */
1914                                 1,              /* Turn on for "Forwardable ticket" [in] */
1915                                 &fwdData );     /* Resulting response [out] */
1916
1917
1918         if (retval) {
1919                 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1920                         error_message(retval)));
1921                 goto out;
1922         }
1923
1924         if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1925                 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1926                 retval = EINVAL;
1927                 goto out;
1928         }
1929
1930         /* We're going to allocate a gssChecksum structure with a little
1931            extra data the length of the kerberos credentials length
1932            (APPLICATION 22) so that we can pack it on the end of the structure.
1933         */
1934
1935         pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1936         if (!pChksum) {
1937                 retval = ENOMEM;
1938                 goto out;
1939         }
1940
1941         p = pChksum;
1942
1943         SIVAL(p, 0, GSSAPI_BNDLENGTH);
1944         p += 4;
1945
1946         /* Zero out the bindings fields */
1947         memset(p, '\0', GSSAPI_BNDLENGTH );
1948         p += GSSAPI_BNDLENGTH;
1949
1950         SIVAL(p, 0, GSS_C_DELEG_FLAG );
1951         p += 4;
1952         SSVAL(p, 0, 1 );
1953         p += 2;
1954         SSVAL(p, 0, fwdData.length );
1955         p += 2;
1956
1957         /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1958         memcpy(p, fwdData.data, fwdData.length );
1959         p += fwdData.length;
1960
1961         /* We need to do this in order to allow our GSS-API  */
1962         retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1963         if (retval) {
1964                 goto out;
1965         }
1966
1967         /* We now have a service ticket, now turn it into an AP-REQ. */
1968         authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1969
1970         /* Caller should call free() when they're done with this. */
1971         authenticator->data = (char *)pChksum;
1972
1973   out:
1974
1975         /* Remove that input data, we never needed it anyway. */
1976         if (fwdData.length > 0) {
1977                 krb5_free_data_contents( context, &fwdData );
1978         }
1979
1980         return retval;
1981 }
1982 #endif
1983
1984 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1985     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1986     defined(HAVE_KRB5_GET_CREDS)
1987 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1988                                                              krb5_ccache ccache,
1989                                                              krb5_principal me,
1990                                                              krb5_principal server,
1991                                                              krb5_principal impersonate_princ,
1992                                                              krb5_creds **out_creds)
1993 {
1994         krb5_error_code ret;
1995         krb5_get_creds_opt opt;
1996
1997         ret = krb5_get_creds_opt_alloc(context, &opt);
1998         if (ret) {
1999                 goto done;
2000         }
2001         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
2002
2003         if (impersonate_princ) {
2004                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
2005                                                          impersonate_princ);
2006                 if (ret) {
2007                         goto done;
2008                 }
2009         }
2010
2011         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2012         if (ret) {
2013                 goto done;
2014         }
2015
2016  done:
2017         if (opt) {
2018                 krb5_get_creds_opt_free(context, opt);
2019         }
2020         return ret;
2021 }
2022 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2023
2024 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2025 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2026                                                          krb5_ccache ccache,
2027                                                          krb5_principal me,
2028                                                          krb5_principal server,
2029                                                          krb5_principal impersonate_princ,
2030                                                          krb5_creds **out_creds)
2031 {
2032         krb5_error_code ret;
2033         krb5_creds in_creds;
2034
2035 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2036 krb5_error_code KRB5_CALLCONV
2037 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2038                               krb5_ccache ccache, krb5_creds *in_creds,
2039                               krb5_data *subject_cert,
2040                               krb5_creds **out_creds);
2041 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2042
2043         ZERO_STRUCT(in_creds);
2044
2045         if (impersonate_princ) {
2046
2047                 in_creds.server = me;
2048                 in_creds.client = impersonate_princ;
2049
2050                 ret = krb5_get_credentials_for_user(context,
2051                                                     0, /* krb5_flags options */
2052                                                     ccache,
2053                                                     &in_creds,
2054                                                     NULL, /* krb5_data *subject_cert */
2055                                                     out_creds);
2056         } else {
2057                 in_creds.client = me;
2058                 in_creds.server = server;
2059
2060                 ret = krb5_get_credentials(context, 0, ccache,
2061                                            &in_creds, out_creds);
2062         }
2063
2064         return ret;
2065 }
2066 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2067
2068 /*
2069  * smb_krb5_get_credentials
2070  *
2071  * @brief Get krb5 credentials for a server
2072  *
2073  * @param[in] context           An initialized krb5_context
2074  * @param[in] ccache            An initialized krb5_ccache
2075  * @param[in] me                The krb5_principal of the caller
2076  * @param[in] server            The krb5_principal of the requested service
2077  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2078  * @param[out] out_creds        The returned krb5_creds structure
2079  * @return krb5_error_code
2080  *
2081  */
2082 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2083                                          krb5_ccache ccache,
2084                                          krb5_principal me,
2085                                          krb5_principal server,
2086                                          krb5_principal impersonate_princ,
2087                                          krb5_creds **out_creds)
2088 {
2089         krb5_error_code ret;
2090         krb5_creds *creds = NULL;
2091
2092         *out_creds = NULL;
2093
2094         if (impersonate_princ) {
2095 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2096                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2097 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2098                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2099 #else
2100                 ret = ENOTSUP;
2101 #endif
2102         } else {
2103                 krb5_creds in_creds;
2104
2105                 ZERO_STRUCT(in_creds);
2106
2107                 in_creds.client = me;
2108                 in_creds.server = server;
2109
2110                 ret = krb5_get_credentials(context, 0, ccache,
2111                                            &in_creds, &creds);
2112         }
2113         if (ret) {
2114                 goto done;
2115         }
2116
2117         ret = krb5_cc_store_cred(context, ccache, creds);
2118         if (ret) {
2119                 goto done;
2120         }
2121
2122         if (out_creds) {
2123                 *out_creds = creds;
2124         }
2125
2126  done:
2127         if (creds && ret) {
2128                 krb5_free_creds(context, creds);
2129         }
2130
2131         return ret;
2132 }
2133
2134 /*
2135  * smb_krb5_get_creds
2136  *
2137  * @brief Get krb5 credentials for a server
2138  *
2139  * @param[in] server_s          The string name of the service
2140  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2141  * @param[in] cc                The krb5 credential cache string name (optional)
2142  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2143  * @param[out] creds_p          The returned krb5_creds structure
2144  * @return krb5_error_code
2145  *
2146  */
2147 krb5_error_code smb_krb5_get_creds(const char *server_s,
2148                                    time_t time_offset,
2149                                    const char *cc,
2150                                    const char *impersonate_princ_s,
2151                                    krb5_creds **creds_p)
2152 {
2153         krb5_error_code ret;
2154         krb5_context context = NULL;
2155         krb5_principal me = NULL;
2156         krb5_principal server = NULL;
2157         krb5_principal impersonate_princ = NULL;
2158         krb5_creds *creds = NULL;
2159         krb5_ccache ccache = NULL;
2160
2161         *creds_p = NULL;
2162
2163         initialize_krb5_error_table();
2164         ret = krb5_init_context(&context);
2165         if (ret) {
2166                 goto done;
2167         }
2168
2169         if (time_offset != 0) {
2170                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2171         }
2172
2173         ret = krb5_cc_resolve(context, cc ? cc :
2174                 krb5_cc_default_name(context), &ccache);
2175         if (ret) {
2176                 goto done;
2177         }
2178
2179         ret = krb5_cc_get_principal(context, ccache, &me);
2180         if (ret) {
2181                 goto done;
2182         }
2183
2184         ret = smb_krb5_parse_name(context, server_s, &server);
2185         if (ret) {
2186                 goto done;
2187         }
2188
2189         if (impersonate_princ_s) {
2190                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2191                                           &impersonate_princ);
2192                 if (ret) {
2193                         goto done;
2194                 }
2195         }
2196
2197         ret = smb_krb5_get_credentials(context, ccache,
2198                                        me, server, impersonate_princ,
2199                                        &creds);
2200         if (ret) {
2201                 goto done;
2202         }
2203
2204         ret = krb5_cc_store_cred(context, ccache, creds);
2205         if (ret) {
2206                 goto done;
2207         }
2208
2209         if (creds_p) {
2210                 *creds_p = creds;
2211         }
2212
2213         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2214                 server_s));
2215
2216         if (impersonate_princ_s) {
2217                 char *client = NULL;
2218
2219                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2220                 if (ret) {
2221                         goto done;
2222                 }
2223                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2224                         client));
2225                 TALLOC_FREE(client);
2226         }
2227
2228  done:
2229         if (!context) {
2230                 return ret;
2231         }
2232
2233         if (creds && ret) {
2234                 krb5_free_creds(context, creds);
2235         }
2236         if (server) {
2237                 krb5_free_principal(context, server);
2238         }
2239         if (me) {
2240                 krb5_free_principal(context, me);
2241         }
2242         if (impersonate_princ) {
2243                 krb5_free_principal(context, impersonate_princ);
2244         }
2245         if (ccache) {
2246                 krb5_cc_close(context, ccache);
2247         }
2248         krb5_free_context(context);
2249
2250         return ret;
2251 }
2252
2253 /*
2254  * smb_krb5_principal_get_realm
2255  *
2256  * @brief Get realm of a principal
2257  *
2258  * @param[in] context           The krb5_context
2259  * @param[in] principal         The principal
2260  * @return pointer to the realm
2261  *
2262  */
2263
2264 char *smb_krb5_principal_get_realm(krb5_context context,
2265                                    krb5_principal principal)
2266 {
2267 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2268         return krb5_principal_get_realm(context, principal);
2269 #elif defined(krb5_princ_realm) /* MIT */
2270         krb5_data *realm;
2271         realm = krb5_princ_realm(context, principal);
2272         return (char *)realm->data;
2273 #else
2274         return NULL;
2275 #endif
2276 }
2277
2278 #else /* HAVE_KRB5 */
2279  /* this saves a few linking headaches */
2280  int cli_krb5_get_ticket(const char *principal, time_t time_offset,
2281                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
2282                         const char *ccname, time_t *tgs_expire,
2283                         const char *impersonate_princ_s)
2284 {
2285          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2286          return 1;
2287 }
2288
2289 #endif