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(TALLOC_CTX *mem_ctx,
 832                         const char *principal, time_t time_offset,
 833                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 834                         uint32_t extra_ap_opts, const char *ccname,
 835                         time_t *tgs_expire,
 836                         const char *impersonate_princ_s)
 837
 838 {
 839         krb5_error_code retval;
 840         krb5_data packet;
 841         krb5_context context = NULL;
 842         krb5_ccache ccdef = NULL;
 843         krb5_auth_context auth_context = NULL;
 844         krb5_enctype enc_types[] = {
 845 #ifdef ENCTYPE_ARCFOUR_HMAC
 846                 ENCTYPE_ARCFOUR_HMAC,
 847 #endif
 848                 ENCTYPE_DES_CBC_MD5,
 849                 ENCTYPE_DES_CBC_CRC,
 850                 ENCTYPE_NULL};
 851
 852         initialize_krb5_error_table();
 853         retval = krb5_init_context(&context);
 854         if (retval) {
 855                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 856                          error_message(retval)));
 857                 goto failed;
 858         }
 859
 860         if (time_offset != 0) {
 861                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 862         }
 863
 864         if ((retval = krb5_cc_resolve(context, ccname ?
 865                         ccname : krb5_cc_default_name(context), &ccdef))) {
 866                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 867                          error_message(retval)));
 868                 goto failed;
 869         }
 870
 871         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 872                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 873                          error_message(retval)));
 874                 goto failed;
 875         }
 876
 877         retval = ads_krb5_mk_req(context, &auth_context,
 878                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 879                                 principal, ccdef, &packet,
 880                                 tgs_expire, impersonate_princ_s);
 881         if (retval) {
 882                 goto failed;
 883         }
 884
 885         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 886                                  session_key_krb5, false);
 887
 888         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 889
 890         kerberos_free_data_contents(context, &packet);
 891
 892 failed:
 893
 894         if (context) {
 895                 if (ccdef)
 896                         krb5_cc_close(context, ccdef);
 897                 if (auth_context)
 898                         krb5_auth_con_free(context, auth_context);
 899                 krb5_free_context(context);
 900         }
 901
 902         return retval;
 903 }
 904
 905 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 906                               krb5_context context,
 907                               krb5_auth_context auth_context,
 908                               DATA_BLOB *session_key, bool remote)
 909 {
 910         krb5_keyblock *skey = NULL;
 911         krb5_error_code err = 0;
 912         bool ret = false;
 913
 914         if (remote) {
 915                 err = krb5_auth_con_getremotesubkey(context,
 916                                                     auth_context, &skey);
 917         } else {
 918                 err = krb5_auth_con_getlocalsubkey(context,
 919                                                    auth_context, &skey);
 920         }
 921
 922         if (err || skey == NULL) {
 923                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 924                 goto done;
 925         }
 926
 927         DEBUG(10, ("Got KRB5 session key of length %d\n",
 928                    (int)KRB5_KEY_LENGTH(skey)));
 929
 930         *session_key = data_blob_talloc(mem_ctx,
 931                                          KRB5_KEY_DATA(skey),
 932                                          KRB5_KEY_LENGTH(skey));
 933         dump_data_pw("KRB5 Session Key:\n",
 934                      session_key->data,
 935                      session_key->length);
 936
 937         ret = true;
 938
 939 done:
 940         if (skey) {
 941                 krb5_free_keyblock(context, skey);
 942         }
 943
 944         return ret;
 945 }
 946
 947
 948 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 949  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 950
 951  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 952 {
 953         static krb5_data kdata;
 954
 955         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 956         kdata.length = strlen((const char *)kdata.data);
 957         return &kdata;
 958 }
 959 #endif
 960
 961  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 962 {
 963 /* Try krb5_free_keytab_entry_contents first, since
 964  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 965  * krb5_kt_free_entry but only has a prototype for the first, while the
 966  * second is considered private.
 967  */
 968 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 969         return krb5_free_keytab_entry_contents(context, kt_entry);
 970 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
 971         return krb5_kt_free_entry(context, kt_entry);
 972 #else
 973 #error UNKNOWN_KT_FREE_FUNCTION
 974 #endif
 975 }
 976
 977  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
 978                                      struct PAC_SIGNATURE_DATA *sig)
 979 {
 980 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
 981         cksum->cksumtype        = (krb5_cksumtype)sig->type;
 982         cksum->checksum.length  = sig->signature.length;
 983         cksum->checksum.data    = sig->signature.data;
 984 #else
 985         cksum->checksum_type    = (krb5_cksumtype)sig->type;
 986         cksum->length           = sig->signature.length;
 987         cksum->contents         = sig->signature.data;
 988 #endif
 989 }
 990
 991  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
 992                                           const krb5_keyblock *keyblock,
 993                                          krb5_keyusage usage,
 994                                          krb5_checksum *cksum,
 995                                          uint8 *data,
 996                                          size_t length)
 997 {
 998         krb5_error_code ret;
 999
1000         /* verify the checksum */
1001
1002         /* welcome to the wonderful world of samba's kerberos abstraction layer:
1003          *
1004          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
1005          * -----------------------------------------------------------------------------
1006          * krb5_c_verify_checksum       -                       works           works
1007          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
1008          */
1009
1010 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1011         {
1012                 krb5_boolean checksum_valid = False;
1013                 krb5_data input;
1014
1015                 input.data = (char *)data;
1016                 input.length = length;
1017
1018                 ret = krb5_c_verify_checksum(context,
1019                                              keyblock,
1020                                              usage,
1021                                              &input,
1022                                              cksum,
1023                                              &checksum_valid);
1024                 if (ret) {
1025                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1026                                 error_message(ret)));
1027                         return ret;
1028                 }
1029
1030                 if (!checksum_valid)
1031                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1032         }
1033
1034 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1035
1036         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1037          * without enctype and it ignores any key_usage types - Guenther */
1038
1039         {
1040
1041                 krb5_crypto crypto;
1042                 ret = krb5_crypto_init(context,
1043                                        keyblock,
1044                                        0,
1045                                        &crypto);
1046                 if (ret) {
1047                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1048                                 error_message(ret)));
1049                         return ret;
1050                 }
1051
1052                 ret = krb5_verify_checksum(context,
1053                                            crypto,
1054                                            usage,
1055                                            data,
1056                                            length,
1057                                            cksum);
1058
1059                 krb5_crypto_destroy(context, crypto);
1060         }
1061
1062 #else
1063 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1064 #endif
1065
1066         return ret;
1067 }
1068
1069  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1070 {
1071 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1072         return tkt->enc_part2->times.authtime;
1073 #else
1074         return tkt->ticket.authtime;
1075 #endif
1076 }
1077
1078 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1079 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1080 {
1081 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1082         if (ap_req->ticket->enc_part.kvno)
1083                 return ap_req->ticket->enc_part.kvno;
1084 #else /* Heimdal */
1085         if (ap_req->ticket.enc_part.kvno)
1086                 return *ap_req->ticket.enc_part.kvno;
1087 #endif
1088         return 0;
1089 }
1090
1091 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1092 {
1093 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1094         return ap_req->ticket.enc_part.etype;
1095 #else /* MIT */
1096         return ap_req->ticket->enc_part.enctype;
1097 #endif
1098 }
1099 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1100
1101 static krb5_error_code
1102 get_key_from_keytab(krb5_context context,
1103                     krb5_const_principal server,
1104                     krb5_enctype enctype,
1105                     krb5_kvno kvno,
1106                     krb5_keyblock **out_key)
1107 {
1108         krb5_keytab_entry entry;
1109         krb5_error_code ret;
1110         krb5_keytab keytab;
1111         char *name = NULL;
1112         krb5_keyblock *keyp;
1113
1114         /* We have to open a new keytab handle here, as MIT does
1115            an implicit open/getnext/close on krb5_kt_get_entry. We
1116            may be in the middle of a keytab enumeration when this is
1117            called. JRA. */
1118
1119         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1120         if (ret) {
1121                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1122                 return ret;
1123         }
1124
1125         if ( DEBUGLEVEL >= 10 ) {
1126                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1127                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1128                                 kvno, enctype, name));
1129                         TALLOC_FREE(name);
1130                 }
1131         }
1132
1133         ret = krb5_kt_get_entry(context,
1134                                 keytab,
1135                                 server,
1136                                 kvno,
1137                                 enctype,
1138                                 &entry);
1139
1140         if (ret) {
1141                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1142                 goto out;
1143         }
1144
1145         keyp = KRB5_KT_KEY(&entry);
1146
1147         ret = krb5_copy_keyblock(context, keyp, out_key);
1148         if (ret) {
1149                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1150                 goto out;
1151         }
1152
1153         smb_krb5_kt_free_entry(context, &entry);
1154
1155 out:
1156         krb5_kt_close(context, keytab);
1157         return ret;
1158 }
1159
1160 /* Prototypes */
1161
1162  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1163                                                  const krb5_data *inbuf,
1164                                                  krb5_kvno *kvno,
1165                                                  krb5_enctype *enctype)
1166 {
1167 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1168         {
1169                 krb5_error_code ret;
1170                 krb5_ap_req ap_req;
1171
1172                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1173                 if (ret)
1174                         return ret;
1175
1176                 *kvno = get_kvno_from_ap_req(&ap_req);
1177                 *enctype = get_enctype_from_ap_req(&ap_req);
1178
1179                 free_AP_REQ(&ap_req);
1180                 return 0;
1181         }
1182 #endif
1183
1184         /* Possibly not an appropriate error code. */
1185         return KRB5KDC_ERR_BADOPTION;
1186 }
1187
1188  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1189                                                         krb5_auth_context *auth_context,
1190                                                         const krb5_data *inbuf,
1191                                                         krb5_const_principal server,
1192                                                         krb5_keytab keytab,
1193                                                         krb5_flags *ap_req_options,
1194                                                         krb5_ticket **ticket,
1195                                                         krb5_keyblock **keyblock)
1196 {
1197         krb5_error_code ret;
1198         krb5_kvno kvno;
1199         krb5_enctype enctype;
1200         krb5_keyblock *local_keyblock;
1201
1202         ret = krb5_rd_req(context,
1203                           auth_context,
1204                           inbuf,
1205                           server,
1206                           keytab,
1207                           ap_req_options,
1208                           ticket);
1209         if (ret) {
1210                 return ret;
1211         }
1212
1213 #ifdef KRB5_TICKET_HAS_KEYINFO
1214         enctype = (*ticket)->enc_part.enctype;
1215         kvno = (*ticket)->enc_part.kvno;
1216 #else
1217         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1218         if (ret) {
1219                 return ret;
1220         }
1221 #endif
1222
1223         ret = get_key_from_keytab(context,
1224                                   server,
1225                                   enctype,
1226                                   kvno,
1227                                   &local_keyblock);
1228         if (ret) {
1229                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1230                 goto out;
1231         }
1232
1233 out:
1234         if (ret && local_keyblock != NULL) {
1235                 krb5_free_keyblock(context, local_keyblock);
1236         } else {
1237                 *keyblock = local_keyblock;
1238         }
1239
1240         return ret;
1241 }
1242
1243  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1244                                             const char *name,
1245                                             krb5_principal *principal)
1246 {
1247 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1248         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1249 #endif
1250
1251         /* we are cheating here because parse_name will in fact set the realm.
1252          * We don't care as the only caller of smb_krb5_parse_name_norealm
1253          * ignores the realm anyway when calling
1254          * smb_krb5_principal_compare_any_realm later - Guenther */
1255
1256         return smb_krb5_parse_name(context, name, principal);
1257 }
1258
1259  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1260                                           krb5_const_principal princ1,
1261                                           krb5_const_principal princ2)
1262 {
1263 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1264
1265         return krb5_principal_compare_any_realm(context, princ1, princ2);
1266
1267 /* krb5_princ_size is a macro in MIT */
1268 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1269
1270         int i, len1, len2;
1271         const krb5_data *p1, *p2;
1272
1273         len1 = krb5_princ_size(context, princ1);
1274         len2 = krb5_princ_size(context, princ2);
1275
1276         if (len1 != len2)
1277                 return False;
1278
1279         for (i = 0; i < len1; i++) {
1280
1281                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1282                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1283
1284                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1285                         return False;
1286         }
1287
1288         return True;
1289 #else
1290 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1291 #endif
1292 }
1293
1294  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1295                                        const char *client_string,       /* gd@BER.SUSE.DE */
1296                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1297                                        time_t *expire_time)
1298 {
1299         krb5_error_code ret;
1300         krb5_context context = NULL;
1301         krb5_ccache ccache = NULL;
1302         krb5_principal client = NULL;
1303         krb5_creds creds, creds_in, *creds_out = NULL;
1304
1305         ZERO_STRUCT(creds);
1306         ZERO_STRUCT(creds_in);
1307
1308         initialize_krb5_error_table();
1309         ret = krb5_init_context(&context);
1310         if (ret) {
1311                 goto done;
1312         }
1313
1314         if (!ccache_string) {
1315                 ccache_string = krb5_cc_default_name(context);
1316         }
1317
1318         if (!ccache_string) {
1319                 ret = EINVAL;
1320                 goto done;
1321         }
1322
1323         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1324
1325         /* FIXME: we should not fall back to defaults */
1326         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1327         if (ret) {
1328                 goto done;
1329         }
1330
1331         if (client_string) {
1332                 ret = smb_krb5_parse_name(context, client_string, &client);
1333                 if (ret) {
1334                         goto done;
1335                 }
1336         } else {
1337                 ret = krb5_cc_get_principal(context, ccache, &client);
1338                 if (ret) {
1339                         goto done;
1340                 }
1341         }
1342
1343 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1344         {
1345                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1346                 if (ret) {
1347                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1348                         goto done;
1349                 }
1350         }
1351 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1352         {
1353                 krb5_kdc_flags flags;
1354                 krb5_realm *client_realm = NULL;
1355
1356                 ret = krb5_copy_principal(context, client, &creds_in.client);
1357                 if (ret) {
1358                         goto done;
1359                 }
1360
1361                 if (service_string) {
1362                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1363                         if (ret) {
1364                                 goto done;
1365                         }
1366                 } else {
1367                         /* build tgt service by default */
1368                         client_realm = krb5_princ_realm(context, creds_in.client);
1369                         if (!client_realm) {
1370                                 ret = ENOMEM;
1371                                 goto done;
1372                         }
1373                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1374                         if (ret) {
1375                                 goto done;
1376                         }
1377                 }
1378
1379                 flags.i = 0;
1380                 flags.b.renewable = flags.b.renew = True;
1381
1382                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1383                 if (ret) {
1384                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1385                         goto done;
1386                 }
1387
1388                 creds = *creds_out;
1389         }
1390 #else
1391 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1392 #endif
1393
1394         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1395         ret = krb5_cc_initialize(context, ccache, client);
1396         if (ret) {
1397                 goto done;
1398         }
1399
1400         ret = krb5_cc_store_cred(context, ccache, &creds);
1401
1402         if (expire_time) {
1403                 *expire_time = (time_t) creds.times.endtime;
1404         }
1405
1406 done:
1407         krb5_free_cred_contents(context, &creds_in);
1408
1409         if (creds_out) {
1410                 krb5_free_creds(context, creds_out);
1411         } else {
1412                 krb5_free_cred_contents(context, &creds);
1413         }
1414
1415         if (client) {
1416                 krb5_free_principal(context, client);
1417         }
1418         if (ccache) {
1419                 krb5_cc_close(context, ccache);
1420         }
1421         if (context) {
1422                 krb5_free_context(context);
1423         }
1424
1425         return ret;
1426 }
1427
1428  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1429 {
1430         krb5_error_code ret = 0;
1431         if (addr == NULL) {
1432                 return ret;
1433         }
1434 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1435         krb5_free_addresses(context, addr->addrs);
1436 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1437         ret = krb5_free_addresses(context, addr->addrs);
1438         SAFE_FREE(addr->addrs);
1439 #endif
1440         SAFE_FREE(addr);
1441         addr = NULL;
1442         return ret;
1443 }
1444
1445  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1446 {
1447         krb5_error_code ret = 0;
1448         nstring buf;
1449 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1450         krb5_address **addrs = NULL;
1451 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1452         krb5_addresses *addrs = NULL;
1453 #endif
1454
1455         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1456         if (*kerb_addr == NULL) {
1457                 return ENOMEM;
1458         }
1459
1460         put_name(buf, global_myname(), ' ', 0x20);
1461
1462 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1463         {
1464                 int num_addr = 2;
1465
1466                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1467                 if (addrs == NULL) {
1468                         SAFE_FREE(*kerb_addr);
1469                         return ENOMEM;
1470                 }
1471
1472                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1473
1474                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1475                 if (addrs[0] == NULL) {
1476                         SAFE_FREE(addrs);
1477                         SAFE_FREE(*kerb_addr);
1478                         return ENOMEM;
1479                 }
1480
1481                 addrs[0]->magic = KV5M_ADDRESS;
1482                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1483                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1484                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1485                 if (addrs[0]->contents == NULL) {
1486                         SAFE_FREE(addrs[0]);
1487                         SAFE_FREE(addrs);
1488                         SAFE_FREE(*kerb_addr);
1489                         return ENOMEM;
1490                 }
1491
1492                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1493
1494                 addrs[1] = NULL;
1495         }
1496 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1497         {
1498                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1499                 if (addrs == NULL) {
1500                         SAFE_FREE(*kerb_addr);
1501                         return ENOMEM;
1502                 }
1503
1504                 memset(addrs, 0, sizeof(krb5_addresses));
1505
1506                 addrs->len = 1;
1507                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1508                 if (addrs->val == NULL) {
1509                         SAFE_FREE(addrs);
1510                         SAFE_FREE(kerb_addr);
1511                         return ENOMEM;
1512                 }
1513
1514                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1515                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1516                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1517                 if (addrs->val[0].address.data == NULL) {
1518                         SAFE_FREE(addrs->val);
1519                         SAFE_FREE(addrs);
1520                         SAFE_FREE(*kerb_addr);
1521                         return ENOMEM;
1522                 }
1523
1524                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1525         }
1526 #else
1527 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1528 #endif
1529         (*kerb_addr)->addrs = addrs;
1530
1531         return ret;
1532 }
1533
1534  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1535 {
1536 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1537         krb5_free_error_contents(context, krberror);
1538 #else /* MIT */
1539         krb5_free_error(context, krberror);
1540 #endif
1541 }
1542
1543  krb5_error_code handle_krberror_packet(krb5_context context,
1544                                         krb5_data *packet)
1545 {
1546         krb5_error_code ret;
1547         bool got_error_code = False;
1548
1549         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1550
1551 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1552         {
1553                 krb5_error krberror;
1554
1555                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1556                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1557                                 error_message(ret)));
1558                         return ret;
1559                 }
1560
1561                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1562                         ret = (krb5_error_code) krberror.error_code;
1563                         got_error_code = True;
1564                 }
1565
1566                 smb_krb5_free_error(context, &krberror);
1567         }
1568 #else /* MIT */
1569         {
1570                 krb5_error *krberror;
1571
1572                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1573                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1574                                 error_message(ret)));
1575                         return ret;
1576                 }
1577
1578                 if (krberror->e_data.data == NULL) {
1579 #if defined(ERROR_TABLE_BASE_krb5)
1580                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1581 #else
1582                         ret = (krb5_error_code)krberror->error;
1583 #endif
1584                         got_error_code = True;
1585                 }
1586                 smb_krb5_free_error(context, krberror);
1587         }
1588 #endif
1589         if (got_error_code) {
1590                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1591                         error_message(ret), ret));
1592         }
1593         return ret;
1594 }
1595
1596  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1597                                             krb5_get_init_creds_opt **opt)
1598 {
1599 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1600         /* Heimdal or modern MIT version */
1601         return krb5_get_init_creds_opt_alloc(context, opt);
1602 #else
1603         /* Historical MIT version */
1604         krb5_get_init_creds_opt *my_opt;
1605
1606         *opt = NULL;
1607
1608         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1609                 return ENOMEM;
1610         }
1611
1612         krb5_get_init_creds_opt_init(my_opt);
1613
1614         *opt =  my_opt;
1615         return 0;
1616 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1617 }
1618
1619  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1620                                 krb5_get_init_creds_opt *opt)
1621 {
1622 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1623
1624 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1625         /* Modern MIT or Heimdal version */
1626         krb5_get_init_creds_opt_free(context, opt);
1627 #else
1628         /* Heimdal version */
1629         krb5_get_init_creds_opt_free(opt);
1630 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1631
1632 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1633         /* Historical MIT version */
1634         SAFE_FREE(opt);
1635         opt = NULL;
1636 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1637 }
1638
1639  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1640 {
1641         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1642 }
1643
1644
1645 /* caller needs to free etype_s */
1646  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1647                                             krb5_enctype enctype,
1648                                             char **etype_s)
1649 {
1650 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1651         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1652 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1653         char buf[256];
1654         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1655         if (ret) {
1656                 return ret;
1657         }
1658         *etype_s = SMB_STRDUP(buf);
1659         if (!*etype_s) {
1660                 return ENOMEM;
1661         }
1662         return ret;
1663 #else
1664 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1665 #endif
1666 }
1667
1668  krb5_error_code smb_krb5_mk_error(krb5_context context,
1669                                 krb5_error_code error_code,
1670                                 const krb5_principal server,
1671                                 krb5_data *reply)
1672 {
1673 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1674         /*
1675          * The MIT interface is *terrible*.
1676          * We have to construct this ourselves...
1677          */
1678         krb5_error e;
1679
1680         memset(&e, 0, sizeof(e));
1681         krb5_us_timeofday(context, &e.stime, &e.susec);
1682         e.server = server;
1683 #if defined(krb5_err_base)
1684         e.error = error_code - krb5_err_base;
1685 #elif defined(ERROR_TABLE_BASE_krb5)
1686         e.error = error_code - ERROR_TABLE_BASE_krb5;
1687 #else
1688         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1689 #endif
1690
1691         return krb5_mk_error(context, &e, reply);
1692 #else /* Heimdal. */
1693         return krb5_mk_error(context,
1694                                 error_code,
1695                                 NULL,
1696                                 NULL, /* e_data */
1697                                 NULL,
1698                                 server,
1699                                 NULL,
1700                                 NULL,
1701                                 reply);
1702 #endif
1703 }
1704
1705 /**********************************************************************
1706  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1707  * allows to process non-default keytab names.
1708  * @param context krb5_context
1709  * @param keytab_name_req string
1710  * @param write_access bool if writable keytab is required
1711  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1712  * @return krb5_error_code
1713 **********************************************************************/
1714
1715 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1716 #ifndef MAX_KEYTAB_NAME_LEN
1717 #define MAX_KEYTAB_NAME_LEN 1100
1718 #endif
1719
1720  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1721                                       const char *keytab_name_req,
1722                                       bool write_access,
1723                                       krb5_keytab *keytab)
1724 {
1725         krb5_error_code ret = 0;
1726         TALLOC_CTX *mem_ctx;
1727         char keytab_string[MAX_KEYTAB_NAME_LEN];
1728         char *kt_str = NULL;
1729         bool found_valid_name = False;
1730         const char *pragma = "FILE";
1731         const char *tmp = NULL;
1732
1733         if (!write_access && !keytab_name_req) {
1734                 /* caller just wants to read the default keytab readonly, so be it */
1735                 return krb5_kt_default(context, keytab);
1736         }
1737
1738         mem_ctx = talloc_init("smb_krb5_open_keytab");
1739         if (!mem_ctx) {
1740                 return ENOMEM;
1741         }
1742
1743 #ifdef HAVE_WRFILE_KEYTAB
1744         if (write_access) {
1745                 pragma = "WRFILE";
1746         }
1747 #endif
1748
1749         if (keytab_name_req) {
1750
1751                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1752                         ret = KRB5_CONFIG_NOTENUFSPACE;
1753                         goto out;
1754                 }
1755
1756                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1757                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1758                         tmp = keytab_name_req;
1759                         goto resolve;
1760                 }
1761
1762                 if (keytab_name_req[0] != '/') {
1763                         ret = KRB5_KT_BADNAME;
1764                         goto out;
1765                 }
1766
1767                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1768                 if (!tmp) {
1769                         ret = ENOMEM;
1770                         goto out;
1771                 }
1772
1773                 goto resolve;
1774         }
1775
1776         /* we need to handle more complex keytab_strings, like:
1777          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1778
1779         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1780         if (ret) {
1781                 goto out;
1782         }
1783
1784         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1785
1786         tmp = talloc_strdup(mem_ctx, keytab_string);
1787         if (!tmp) {
1788                 ret = ENOMEM;
1789                 goto out;
1790         }
1791
1792         if (strncmp(tmp, "ANY:", 4) == 0) {
1793                 tmp += 4;
1794         }
1795
1796         memset(&keytab_string, '\0', sizeof(keytab_string));
1797
1798         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1799                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1800                         found_valid_name = True;
1801                         tmp = kt_str;
1802                         tmp += 7;
1803                 }
1804
1805                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1806                         found_valid_name = True;
1807                         tmp = kt_str;
1808                         tmp += 5;
1809                 }
1810
1811                 if (tmp[0] == '/') {
1812                         /* Treat as a FILE: keytab definition. */
1813                         found_valid_name = true;
1814                 }
1815
1816                 if (found_valid_name) {
1817                         if (tmp[0] != '/') {
1818                                 ret = KRB5_KT_BADNAME;
1819                                 goto out;
1820                         }
1821
1822                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1823                         if (!tmp) {
1824                                 ret = ENOMEM;
1825                                 goto out;
1826                         }
1827                         break;
1828                 }
1829         }
1830
1831         if (!found_valid_name) {
1832                 ret = KRB5_KT_UNKNOWN_TYPE;
1833                 goto out;
1834         }
1835
1836  resolve:
1837         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1838         ret = krb5_kt_resolve(context, tmp, keytab);
1839
1840  out:
1841         TALLOC_FREE(mem_ctx);
1842         return ret;
1843 }
1844
1845 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1846                                      krb5_context context,
1847                                      krb5_keytab keytab,
1848                                      const char **keytab_name)
1849 {
1850         char keytab_string[MAX_KEYTAB_NAME_LEN];
1851         krb5_error_code ret = 0;
1852
1853         ret = krb5_kt_get_name(context, keytab,
1854                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1855         if (ret) {
1856                 return ret;
1857         }
1858
1859         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1860         if (!*keytab_name) {
1861                 return ENOMEM;
1862         }
1863
1864         return ret;
1865 }
1866
1867 #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)
1868 /**************************************************************
1869 Routine: ads_krb5_get_fwd_ticket
1870  Description:
1871     When a service ticket is flagged as trusted
1872     for delegation we should provide a forwardable
1873     ticket so that the remote host can act on our
1874     behalf.  This is done by taking the 2nd forwardable
1875     TGT and storing it in the GSS-API authenticator
1876     "checksum".  This routine will populate
1877     the krb5_data authenticator with this TGT.
1878  Parameters:
1879     krb5_context context: The kerberos context for this authentication.
1880     krb5_auth_context:    The authentication context.
1881     krb5_creds *credsp:   The ticket credentials (AS-REP).
1882     krb5_ccache ccache:   The credentials cache.
1883     krb5_data &authenticator: The checksum field that will store the TGT, and
1884      authenticator.data must be freed by the caller.
1885
1886  Returns:
1887     krb5_error_code: 0 if no errors, otherwise set.
1888 **************************************************************/
1889
1890 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1891                                          krb5_auth_context *auth_context,
1892                                          krb5_creds *credsp,
1893                                          krb5_ccache ccache,
1894                                          krb5_data *authenticator)
1895 {
1896         krb5_data fwdData;
1897         krb5_error_code retval = 0;
1898         char *pChksum = NULL;
1899         char *p = NULL;
1900
1901 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
1902    but still has the symbol */
1903 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
1904 krb5_error_code krb5_auth_con_set_req_cksumtype(
1905         krb5_context     context,
1906         krb5_auth_context      auth_context,
1907         krb5_cksumtype     cksumtype);
1908 #endif
1909
1910         ZERO_STRUCT(fwdData);
1911         ZERO_STRUCTP(authenticator);
1912
1913         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1914                                 *auth_context,  /* Authentication context [in] */
1915                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
1916                                 credsp->client, /* Client principal for the tgt [in] */
1917                                 credsp->server, /* Server principal for the tgt [in] */
1918                                 ccache,         /* Credential cache to use for storage [in] */
1919                                 1,              /* Turn on for "Forwardable ticket" [in] */
1920                                 &fwdData );     /* Resulting response [out] */
1921
1922
1923         if (retval) {
1924                 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1925                         error_message(retval)));
1926                 goto out;
1927         }
1928
1929         if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1930                 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1931                 retval = EINVAL;
1932                 goto out;
1933         }
1934
1935         /* We're going to allocate a gssChecksum structure with a little
1936            extra data the length of the kerberos credentials length
1937            (APPLICATION 22) so that we can pack it on the end of the structure.
1938         */
1939
1940         pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1941         if (!pChksum) {
1942                 retval = ENOMEM;
1943                 goto out;
1944         }
1945
1946         p = pChksum;
1947
1948         SIVAL(p, 0, GSSAPI_BNDLENGTH);
1949         p += 4;
1950
1951         /* Zero out the bindings fields */
1952         memset(p, '\0', GSSAPI_BNDLENGTH );
1953         p += GSSAPI_BNDLENGTH;
1954
1955         SIVAL(p, 0, GSS_C_DELEG_FLAG );
1956         p += 4;
1957         SSVAL(p, 0, 1 );
1958         p += 2;
1959         SSVAL(p, 0, fwdData.length );
1960         p += 2;
1961
1962         /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1963         memcpy(p, fwdData.data, fwdData.length );
1964         p += fwdData.length;
1965
1966         /* We need to do this in order to allow our GSS-API  */
1967         retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1968         if (retval) {
1969                 goto out;
1970         }
1971
1972         /* We now have a service ticket, now turn it into an AP-REQ. */
1973         authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1974
1975         /* Caller should call free() when they're done with this. */
1976         authenticator->data = (char *)pChksum;
1977
1978   out:
1979
1980         /* Remove that input data, we never needed it anyway. */
1981         if (fwdData.length > 0) {
1982                 krb5_free_data_contents( context, &fwdData );
1983         }
1984
1985         return retval;
1986 }
1987 #endif
1988
1989 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1990     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1991     defined(HAVE_KRB5_GET_CREDS)
1992 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1993                                                              krb5_ccache ccache,
1994                                                              krb5_principal me,
1995                                                              krb5_principal server,
1996                                                              krb5_principal impersonate_princ,
1997                                                              krb5_creds **out_creds)
1998 {
1999         krb5_error_code ret;
2000         krb5_get_creds_opt opt;
2001
2002         ret = krb5_get_creds_opt_alloc(context, &opt);
2003         if (ret) {
2004                 goto done;
2005         }
2006         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
2007
2008         if (impersonate_princ) {
2009                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
2010                                                          impersonate_princ);
2011                 if (ret) {
2012                         goto done;
2013                 }
2014         }
2015
2016         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2017         if (ret) {
2018                 goto done;
2019         }
2020
2021  done:
2022         if (opt) {
2023                 krb5_get_creds_opt_free(context, opt);
2024         }
2025         return ret;
2026 }
2027 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2028
2029 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2030 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2031                                                          krb5_ccache ccache,
2032                                                          krb5_principal me,
2033                                                          krb5_principal server,
2034                                                          krb5_principal impersonate_princ,
2035                                                          krb5_creds **out_creds)
2036 {
2037         krb5_error_code ret;
2038         krb5_creds in_creds;
2039
2040 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2041 krb5_error_code KRB5_CALLCONV
2042 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2043                               krb5_ccache ccache, krb5_creds *in_creds,
2044                               krb5_data *subject_cert,
2045                               krb5_creds **out_creds);
2046 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2047
2048         ZERO_STRUCT(in_creds);
2049
2050         if (impersonate_princ) {
2051
2052                 in_creds.server = me;
2053                 in_creds.client = impersonate_princ;
2054
2055                 ret = krb5_get_credentials_for_user(context,
2056                                                     0, /* krb5_flags options */
2057                                                     ccache,
2058                                                     &in_creds,
2059                                                     NULL, /* krb5_data *subject_cert */
2060                                                     out_creds);
2061         } else {
2062                 in_creds.client = me;
2063                 in_creds.server = server;
2064
2065                 ret = krb5_get_credentials(context, 0, ccache,
2066                                            &in_creds, out_creds);
2067         }
2068
2069         return ret;
2070 }
2071 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2072
2073 /*
2074  * smb_krb5_get_credentials
2075  *
2076  * @brief Get krb5 credentials for a server
2077  *
2078  * @param[in] context           An initialized krb5_context
2079  * @param[in] ccache            An initialized krb5_ccache
2080  * @param[in] me                The krb5_principal of the caller
2081  * @param[in] server            The krb5_principal of the requested service
2082  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2083  * @param[out] out_creds        The returned krb5_creds structure
2084  * @return krb5_error_code
2085  *
2086  */
2087 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2088                                          krb5_ccache ccache,
2089                                          krb5_principal me,
2090                                          krb5_principal server,
2091                                          krb5_principal impersonate_princ,
2092                                          krb5_creds **out_creds)
2093 {
2094         krb5_error_code ret;
2095         krb5_creds *creds = NULL;
2096
2097         *out_creds = NULL;
2098
2099         if (impersonate_princ) {
2100 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2101                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2102 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2103                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2104 #else
2105                 ret = ENOTSUP;
2106 #endif
2107         } else {
2108                 krb5_creds in_creds;
2109
2110                 ZERO_STRUCT(in_creds);
2111
2112                 in_creds.client = me;
2113                 in_creds.server = server;
2114
2115                 ret = krb5_get_credentials(context, 0, ccache,
2116                                            &in_creds, &creds);
2117         }
2118         if (ret) {
2119                 goto done;
2120         }
2121
2122         ret = krb5_cc_store_cred(context, ccache, creds);
2123         if (ret) {
2124                 goto done;
2125         }
2126
2127         if (out_creds) {
2128                 *out_creds = creds;
2129         }
2130
2131  done:
2132         if (creds && ret) {
2133                 krb5_free_creds(context, creds);
2134         }
2135
2136         return ret;
2137 }
2138
2139 /*
2140  * smb_krb5_get_creds
2141  *
2142  * @brief Get krb5 credentials for a server
2143  *
2144  * @param[in] server_s          The string name of the service
2145  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2146  * @param[in] cc                The krb5 credential cache string name (optional)
2147  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2148  * @param[out] creds_p          The returned krb5_creds structure
2149  * @return krb5_error_code
2150  *
2151  */
2152 krb5_error_code smb_krb5_get_creds(const char *server_s,
2153                                    time_t time_offset,
2154                                    const char *cc,
2155                                    const char *impersonate_princ_s,
2156                                    krb5_creds **creds_p)
2157 {
2158         krb5_error_code ret;
2159         krb5_context context = NULL;
2160         krb5_principal me = NULL;
2161         krb5_principal server = NULL;
2162         krb5_principal impersonate_princ = NULL;
2163         krb5_creds *creds = NULL;
2164         krb5_ccache ccache = NULL;
2165
2166         *creds_p = NULL;
2167
2168         initialize_krb5_error_table();
2169         ret = krb5_init_context(&context);
2170         if (ret) {
2171                 goto done;
2172         }
2173
2174         if (time_offset != 0) {
2175                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2176         }
2177
2178         ret = krb5_cc_resolve(context, cc ? cc :
2179                 krb5_cc_default_name(context), &ccache);
2180         if (ret) {
2181                 goto done;
2182         }
2183
2184         ret = krb5_cc_get_principal(context, ccache, &me);
2185         if (ret) {
2186                 goto done;
2187         }
2188
2189         ret = smb_krb5_parse_name(context, server_s, &server);
2190         if (ret) {
2191                 goto done;
2192         }
2193
2194         if (impersonate_princ_s) {
2195                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2196                                           &impersonate_princ);
2197                 if (ret) {
2198                         goto done;
2199                 }
2200         }
2201
2202         ret = smb_krb5_get_credentials(context, ccache,
2203                                        me, server, impersonate_princ,
2204                                        &creds);
2205         if (ret) {
2206                 goto done;
2207         }
2208
2209         ret = krb5_cc_store_cred(context, ccache, creds);
2210         if (ret) {
2211                 goto done;
2212         }
2213
2214         if (creds_p) {
2215                 *creds_p = creds;
2216         }
2217
2218         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2219                 server_s));
2220
2221         if (impersonate_princ_s) {
2222                 char *client = NULL;
2223
2224                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2225                 if (ret) {
2226                         goto done;
2227                 }
2228                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2229                         client));
2230                 TALLOC_FREE(client);
2231         }
2232
2233  done:
2234         if (!context) {
2235                 return ret;
2236         }
2237
2238         if (creds && ret) {
2239                 krb5_free_creds(context, creds);
2240         }
2241         if (server) {
2242                 krb5_free_principal(context, server);
2243         }
2244         if (me) {
2245                 krb5_free_principal(context, me);
2246         }
2247         if (impersonate_princ) {
2248                 krb5_free_principal(context, impersonate_princ);
2249         }
2250         if (ccache) {
2251                 krb5_cc_close(context, ccache);
2252         }
2253         krb5_free_context(context);
2254
2255         return ret;
2256 }
2257
2258 /*
2259  * smb_krb5_principal_get_realm
2260  *
2261  * @brief Get realm of a principal
2262  *
2263  * @param[in] context           The krb5_context
2264  * @param[in] principal         The principal
2265  * @return pointer to the realm
2266  *
2267  */
2268
2269 char *smb_krb5_principal_get_realm(krb5_context context,
2270                                    krb5_principal principal)
2271 {
2272 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2273         return krb5_principal_get_realm(context, principal);
2274 #elif defined(krb5_princ_realm) /* MIT */
2275         krb5_data *realm;
2276         realm = krb5_princ_realm(context, principal);
2277         return (char *)realm->data;
2278 #else
2279         return NULL;
2280 #endif
2281 }
2282
2283 #else /* HAVE_KRB5 */
2284  /* this saves a few linking headaches */
2285  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2286                         const char *principal, time_t time_offset,
2287                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2288                         uint32_t extra_ap_opts,
2289                         const char *ccname, time_t *tgs_expire,
2290                         const char *impersonate_princ_s)
2291 {
2292          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2293          return 1;
2294 }
2295
2296 #endif