source3/libsmb/clikrb5.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    simple kerberos5 routines for active directory
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Luke Howard 2002-2003
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   7    Copyright (C) Guenther Deschner 2005-2009
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "smb_krb5.h"
  25 #include "../librpc/gen_ndr/krb5pac.h"
  26
  27 #ifndef KRB5_AUTHDATA_WIN2K_PAC
  28 #define KRB5_AUTHDATA_WIN2K_PAC 128
  29 #endif
  30
  31 #ifndef KRB5_AUTHDATA_IF_RELEVANT
  32 #define KRB5_AUTHDATA_IF_RELEVANT 1
  33 #endif
  34
  35 #ifdef HAVE_KRB5
  36
  37 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  38 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  39 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
  40                                                         bind field, flags field. */
  41
  42 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
  43    but still has the symbol */
  44 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
  45 krb5_error_code krb5_auth_con_set_req_cksumtype(
  46         krb5_context     context,
  47         krb5_auth_context      auth_context,
  48         krb5_cksumtype     cksumtype);
  49 #endif
  50
  51 /**************************************************************
  52  Wrappers around kerberos string functions that convert from
  53  utf8 -> unix charset and vica versa.
  54 **************************************************************/
  55
  56 /**************************************************************
  57  krb5_parse_name that takes a UNIX charset.
  58 **************************************************************/
  59
  60  krb5_error_code smb_krb5_parse_name(krb5_context context,
  61                                 const char *name, /* in unix charset */
  62                                 krb5_principal *principal)
  63 {
  64         krb5_error_code ret;
  65         char *utf8_name;
  66         size_t converted_size;
  67
  68         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  69                 return ENOMEM;
  70         }
  71
  72         ret = krb5_parse_name(context, utf8_name, principal);
  73         TALLOC_FREE(utf8_name);
  74         return ret;
  75 }
  76
  77 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
  78 /**************************************************************
  79  krb5_parse_name_norealm that takes a UNIX charset.
  80 **************************************************************/
  81
  82 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
  83                                 const char *name, /* in unix charset */
  84                                 krb5_principal *principal)
  85 {
  86         krb5_error_code ret;
  87         char *utf8_name;
  88         size_t converted_size;
  89
  90         *principal = NULL;
  91         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  92                 return ENOMEM;
  93         }
  94
  95         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  96         TALLOC_FREE(utf8_name);
  97         return ret;
  98 }
  99 #endif
 100
 101 /**************************************************************
 102  krb5_parse_name that returns a UNIX charset name. Must
 103  be freed with talloc_free() call.
 104 **************************************************************/
 105
 106 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 107                                       krb5_context context,
 108                                       krb5_const_principal principal,
 109                                       char **unix_name)
 110 {
 111         krb5_error_code ret;
 112         char *utf8_name;
 113         size_t converted_size;
 114
 115         *unix_name = NULL;
 116         ret = krb5_unparse_name(context, principal, &utf8_name);
 117         if (ret) {
 118                 return ret;
 119         }
 120
 121         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 122                 krb5_free_unparsed_name(context, utf8_name);
 123                 return ENOMEM;
 124         }
 125         krb5_free_unparsed_name(context, utf8_name);
 126         return 0;
 127 }
 128
 129 #ifndef HAVE_KRB5_SET_REAL_TIME
 130 /*
 131  * This function is not in the Heimdal mainline.
 132  */
 133  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 134 {
 135         krb5_error_code ret;
 136         int32_t sec, usec;
 137
 138         ret = krb5_us_timeofday(context, &sec, &usec);
 139         if (ret)
 140                 return ret;
 141
 142         context->kdc_sec_offset = seconds - sec;
 143         context->kdc_usec_offset = microseconds - usec;
 144
 145         return 0;
 146 }
 147 #endif
 148
 149 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 150
 151 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 152
 153 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 154  * to krb5_set_default_tgs_ktypes. See
 155  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 156  *
 157  * If the MIT libraries are not exporting internal symbols, we will end up in
 158  * this branch, which is correct. Otherwise we will continue to use the
 159  * internal symbol
 160  */
 161  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 162 {
 163     return krb5_set_default_tgs_enctypes(ctx, enc);
 164 }
 165
 166 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 167
 168 /* Heimdal */
 169  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 170 {
 171         return krb5_set_default_in_tkt_etypes(ctx, enc);
 172 }
 173
 174 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 175
 176 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 177
 178 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 179 /* HEIMDAL */
 180  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 181 {
 182         memset(pkaddr, '\0', sizeof(krb5_address));
 183 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 184         if (paddr->ss_family == AF_INET6) {
 185                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 186                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 187                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 188                 return true;
 189         }
 190 #endif
 191         if (paddr->ss_family == AF_INET) {
 192                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 193                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 194                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 195                 return true;
 196         }
 197         return false;
 198 }
 199 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 200 /* MIT */
 201  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 202 {
 203         memset(pkaddr, '\0', sizeof(krb5_address));
 204 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 205         if (paddr->ss_family == AF_INET6) {
 206                 pkaddr->addrtype = ADDRTYPE_INET6;
 207                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 208                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 209                 return true;
 210         }
 211 #endif
 212         if (paddr->ss_family == AF_INET) {
 213                 pkaddr->addrtype = ADDRTYPE_INET;
 214                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 215                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 216                 return true;
 217         }
 218         return false;
 219 }
 220 #else
 221 #error UNKNOWN_ADDRTYPE
 222 #endif
 223
 224 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 225 static int create_kerberos_key_from_string_direct(krb5_context context,
 226                                                   krb5_principal host_princ,
 227                                                   krb5_data *password,
 228                                                   krb5_keyblock *key,
 229                                                   krb5_enctype enctype)
 230 {
 231         int ret = 0;
 232         krb5_data salt;
 233         krb5_encrypt_block eblock;
 234
 235         ret = krb5_principal2salt(context, host_princ, &salt);
 236         if (ret) {
 237                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 238                 return ret;
 239         }
 240         krb5_use_enctype(context, &eblock, enctype);
 241         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 242         SAFE_FREE(salt.data);
 243
 244         return ret;
 245 }
 246 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 247 static int create_kerberos_key_from_string_direct(krb5_context context,
 248                                                   krb5_principal host_princ,
 249                                                   krb5_data *password,
 250                                                   krb5_keyblock *key,
 251                                                   krb5_enctype enctype)
 252 {
 253         int ret;
 254         krb5_salt salt;
 255
 256         ret = krb5_get_pw_salt(context, host_princ, &salt);
 257         if (ret) {
 258                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 259                 return ret;
 260         }
 261
 262         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 263         krb5_free_salt(context, salt);
 264
 265         return ret;
 266 }
 267 #else
 268 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 269 #endif
 270
 271  int create_kerberos_key_from_string(krb5_context context,
 272                                         krb5_principal host_princ,
 273                                         krb5_data *password,
 274                                         krb5_keyblock *key,
 275                                         krb5_enctype enctype,
 276                                         bool no_salt)
 277 {
 278         krb5_principal salt_princ = NULL;
 279         int ret;
 280         /*
 281          * Check if we've determined that the KDC is salting keys for this
 282          * principal/enctype in a non-obvious way.  If it is, try to match
 283          * its behavior.
 284          */
 285         if (no_salt) {
 286                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 287                 if (!KRB5_KEY_DATA(key)) {
 288                         return ENOMEM;
 289                 }
 290                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 291                 KRB5_KEY_LENGTH(key) = password->length;
 292                 KRB5_KEY_TYPE(key) = enctype;
 293                 return 0;
 294         }
 295         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 296         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 297         if (salt_princ) {
 298                 krb5_free_principal(context, salt_princ);
 299         }
 300         return ret;
 301 }
 302
 303 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 304  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 305                                             krb5_enctype **enctypes)
 306 {
 307         return krb5_get_permitted_enctypes(context, enctypes);
 308 }
 309 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 310  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 311                                             krb5_enctype **enctypes)
 312 {
 313         return krb5_get_default_in_tkt_etypes(context, enctypes);
 314 }
 315 #else
 316 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 317 #endif
 318
 319 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 320  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 321                                         krb5_auth_context auth_context,
 322                                         krb5_keyblock *keyblock)
 323 {
 324         return krb5_auth_con_setkey(context, auth_context, keyblock);
 325 }
 326 #endif
 327
 328 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 329                            DATA_BLOB *edata,
 330                            DATA_BLOB *edata_out)
 331 {
 332         DATA_BLOB edata_contents;
 333         ASN1_DATA *data;
 334         int edata_type;
 335
 336         if (!edata->length) {
 337                 return False;
 338         }
 339
 340         data = asn1_init(mem_ctx);
 341         if (data == NULL) {
 342                 return false;
 343         }
 344
 345         asn1_load(data, *edata);
 346         asn1_start_tag(data, ASN1_SEQUENCE(0));
 347         asn1_start_tag(data, ASN1_CONTEXT(1));
 348         asn1_read_Integer(data, &edata_type);
 349
 350         if (edata_type != KRB5_PADATA_PW_SALT) {
 351                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 352                         KRB5_PADATA_PW_SALT, edata_type));
 353                 asn1_free(data);
 354                 return False;
 355         }
 356
 357         asn1_start_tag(data, ASN1_CONTEXT(2));
 358         asn1_read_OctetString(data, talloc_tos(), &edata_contents);
 359         asn1_end_tag(data);
 360         asn1_end_tag(data);
 361         asn1_end_tag(data);
 362         asn1_free(data);
 363
 364         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 365
 366         data_blob_free(&edata_contents);
 367
 368         return True;
 369 }
 370
 371
 372 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 373 {
 374         DATA_BLOB pac_contents;
 375         ASN1_DATA *data;
 376         int data_type;
 377
 378         if (!auth_data->length) {
 379                 return False;
 380         }
 381
 382         data = asn1_init(mem_ctx);
 383         if (data == NULL) {
 384                 return false;
 385         }
 386
 387         asn1_load(data, *auth_data);
 388         asn1_start_tag(data, ASN1_SEQUENCE(0));
 389         asn1_start_tag(data, ASN1_SEQUENCE(0));
 390         asn1_start_tag(data, ASN1_CONTEXT(0));
 391         asn1_read_Integer(data, &data_type);
 392
 393         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 394                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 395                 asn1_free(data);
 396                 return False;
 397         }
 398
 399         asn1_end_tag(data);
 400         asn1_start_tag(data, ASN1_CONTEXT(1));
 401         asn1_read_OctetString(data, talloc_tos(), &pac_contents);
 402         asn1_end_tag(data);
 403         asn1_end_tag(data);
 404         asn1_end_tag(data);
 405         asn1_free(data);
 406
 407         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 408
 409         data_blob_free(&pac_contents);
 410
 411         return True;
 412 }
 413
 414  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 415 {
 416         DATA_BLOB auth_data_wrapped;
 417         bool got_auth_data_pac = False;
 418         int i;
 419
 420 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 421         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 422             tkt->enc_part2->authorization_data[0] &&
 423             tkt->enc_part2->authorization_data[0]->length)
 424         {
 425                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 426
 427                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 428                             KRB5_AUTHDATA_IF_RELEVANT) {
 429                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 430                                         tkt->enc_part2->authorization_data[i]->ad_type));
 431                                 continue;
 432                         }
 433
 434                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 435                                                       tkt->enc_part2->authorization_data[i]->length);
 436
 437                         /* check if it is a PAC */
 438                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 439                         data_blob_free(&auth_data_wrapped);
 440
 441                         if (got_auth_data_pac) {
 442                                 return true;
 443                         }
 444                 }
 445
 446                 return got_auth_data_pac;
 447         }
 448
 449 #else
 450         if (tkt->ticket.authorization_data &&
 451             tkt->ticket.authorization_data->len)
 452         {
 453                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 454
 455                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 456                             KRB5_AUTHDATA_IF_RELEVANT) {
 457                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 458                                         tkt->ticket.authorization_data->val[i].ad_type));
 459                                 continue;
 460                         }
 461
 462                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 463                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 464
 465                         /* check if it is a PAC */
 466                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 467                         data_blob_free(&auth_data_wrapped);
 468
 469                         if (got_auth_data_pac) {
 470                                 return true;
 471                         }
 472                 }
 473
 474                 return got_auth_data_pac;
 475         }
 476 #endif
 477         return False;
 478 }
 479
 480  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 481 {
 482 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 483         return tkt->enc_part2->client;
 484 #else
 485         return tkt->client;
 486 #endif
 487 }
 488
 489 #if !defined(HAVE_KRB5_LOCATE_KDC)
 490
 491 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 492  * to a public interface for this functionality, so we have to be able to live
 493  * without it if the MIT libraries are hiding their internal symbols.
 494  */
 495
 496 #if defined(KRB5_KRBHST_INIT)
 497 /* Heimdal */
 498  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 499 {
 500         krb5_krbhst_handle hnd;
 501         krb5_krbhst_info *hinfo;
 502         krb5_error_code rc;
 503         int num_kdcs, i;
 504         struct sockaddr *sa;
 505         struct addrinfo *ai;
 506
 507         *addr_pp = NULL;
 508         *naddrs = 0;
 509
 510         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 511         if (rc) {
 512                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 513                 return rc;
 514         }
 515
 516         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 517                 ;
 518
 519         krb5_krbhst_reset(ctx, hnd);
 520
 521         if (!num_kdcs) {
 522                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 523                 krb5_krbhst_free(ctx, hnd);
 524                 return -1;
 525         }
 526
 527         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 528         if (!sa) {
 529                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 530                 krb5_krbhst_free(ctx, hnd);
 531                 naddrs = 0;
 532                 return -1;
 533         }
 534
 535         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 536
 537         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 538
 539 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 540                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 541                 if (rc) {
 542                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 543                         continue;
 544                 }
 545 #endif
 546                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 547                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 548         }
 549
 550         krb5_krbhst_free(ctx, hnd);
 551
 552         *naddrs = num_kdcs;
 553         *addr_pp = sa;
 554         return 0;
 555 }
 556
 557 #else /* ! defined(KRB5_KRBHST_INIT) */
 558
 559  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 560                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 561 {
 562         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 563         return KRB5_KDC_UNREACH;
 564 }
 565
 566 #endif /* KRB5_KRBHST_INIT */
 567
 568 #else /* ! HAVE_KRB5_LOCATE_KDC */
 569
 570  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 571                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 572 {
 573         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 574 }
 575
 576 #endif /* HAVE_KRB5_LOCATE_KDC */
 577
 578 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 579  void krb5_free_unparsed_name(krb5_context context, char *val)
 580 {
 581         SAFE_FREE(val);
 582 }
 583 #endif
 584
 585  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 586 {
 587 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 588         if (pdata->data) {
 589                 krb5_free_data_contents(context, pdata);
 590         }
 591 #else
 592         SAFE_FREE(pdata->data);
 593 #endif
 594 }
 595
 596  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 597 {
 598 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 599         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 600 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 601         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 602 #else
 603 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 604 #endif
 605 }
 606
 607  bool kerberos_compatible_enctypes(krb5_context context,
 608                                   krb5_enctype enctype1,
 609                                   krb5_enctype enctype2)
 610 {
 611 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 612         krb5_boolean similar = 0;
 613
 614         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 615         return similar ? True : False;
 616 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 617         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 618 #endif
 619 }
 620
 621 static bool ads_cleanup_expired_creds(krb5_context context,
 622                                       krb5_ccache  ccache,
 623                                       krb5_creds  *credsp)
 624 {
 625         krb5_error_code retval;
 626         const char *cc_type = krb5_cc_get_type(context, ccache);
 627
 628         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 629                   cc_type, krb5_cc_get_name(context, ccache),
 630                   http_timestring(talloc_tos(), credsp->times.endtime)));
 631
 632         /* we will probably need new tickets if the current ones
 633            will expire within 10 seconds.
 634         */
 635         if (credsp->times.endtime >= (time(NULL) + 10))
 636                 return False;
 637
 638         /* heimdal won't remove creds from a file ccache, and
 639            perhaps we shouldn't anyway, since internally we
 640            use memory ccaches, and a FILE one probably means that
 641            we're using creds obtained outside of our exectuable
 642         */
 643         if (strequal(cc_type, "FILE")) {
 644                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 645                 return False;
 646         }
 647
 648         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 649         if (retval) {
 650                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 651                           error_message(retval)));
 652                 /* If we have an error in this, we want to display it,
 653                    but continue as though we deleted it */
 654         }
 655         return True;
 656 }
 657
 658 /* Allocate and setup the auth context into the state we need. */
 659
 660 static krb5_error_code setup_auth_context(krb5_context context,
 661                         krb5_auth_context *auth_context)
 662 {
 663         krb5_error_code retval;
 664
 665         retval = krb5_auth_con_init(context, auth_context );
 666         if (retval) {
 667                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 668                         error_message(retval)));
 669                 return retval;
 670         }
 671
 672         /* Ensure this is an addressless ticket. */
 673         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 674         if (retval) {
 675                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 676                         error_message(retval)));
 677         }
 678
 679         return retval;
 680 }
 681
 682 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 683                                                 uint32_t gss_flags)
 684 {
 685         unsigned int orig_length = in_data->length;
 686         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 687         char *gss_cksum = NULL;
 688
 689         if (orig_length) {
 690                 /* Extra length field for delgated ticket. */
 691                 base_cksum_size += 4;
 692         }
 693
 694         if ((unsigned int)base_cksum_size + orig_length <
 695                         (unsigned int)base_cksum_size) {
 696                 return EINVAL;
 697         }
 698
 699         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 700         if (gss_cksum == NULL) {
 701                 return ENOMEM;
 702         }
 703
 704         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 705         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 706
 707         /*
 708          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 709          * This matches the behavior of heimdal and mit.
 710          *
 711          * And it is needed to work against some closed source
 712          * SMB servers.
 713          *
 714          * See bug #7883
 715          */
 716         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 717
 718         SIVAL(gss_cksum, 20, gss_flags);
 719
 720         if (orig_length) {
 721                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 722                 SSVAL(gss_cksum, 26, orig_length);
 723                 /* Copy the kerberos KRB_CRED data */
 724                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 725                 free(in_data->data);
 726                 in_data->data = NULL;
 727                 in_data->length = 0;
 728         }
 729         in_data->data = gss_cksum;
 730         in_data->length = base_cksum_size + orig_length;
 731         return 0;
 732 }
 733
 734 /*
 735   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 736 */
 737 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 738                                        krb5_auth_context *auth_context,
 739                                        const krb5_flags ap_req_options,
 740                                        const char *principal,
 741                                        krb5_ccache ccache,
 742                                        krb5_data *outbuf,
 743                                        time_t *expire_time,
 744                                        const char *impersonate_princ_s)
 745 {
 746         krb5_error_code           retval;
 747         krb5_principal    server;
 748         krb5_principal impersonate_princ = NULL;
 749         krb5_creds              * credsp;
 750         krb5_creds                creds;
 751         krb5_data in_data;
 752         bool creds_ready = False;
 753         int i = 0, maxtries = 3;
 754         uint32_t gss_flags = 0;
 755
 756         ZERO_STRUCT(in_data);
 757
 758         retval = smb_krb5_parse_name(context, principal, &server);
 759         if (retval) {
 760                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 761                 return retval;
 762         }
 763
 764         if (impersonate_princ_s) {
 765                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 766                                              &impersonate_princ);
 767                 if (retval) {
 768                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 769                         goto cleanup_princ;
 770                 }
 771         }
 772
 773         /* obtain ticket & session key */
 774         ZERO_STRUCT(creds);
 775         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 776                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 777                          error_message(retval)));
 778                 goto cleanup_princ;
 779         }
 780
 781         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 782                 /* This can commonly fail on smbd startup with no ticket in the cache.
 783                  * Report at higher level than 1. */
 784                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 785                          error_message(retval)));
 786                 goto cleanup_creds;
 787         }
 788
 789         while (!creds_ready && (i < maxtries)) {
 790
 791                 if ((retval = smb_krb5_get_credentials(context, ccache,
 792                                                        creds.client,
 793                                                        creds.server,
 794                                                        impersonate_princ,
 795                                                        &credsp))) {
 796                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 797                                 principal, error_message(retval)));
 798                         goto cleanup_creds;
 799                 }
 800
 801                 /* cope with ticket being in the future due to clock skew */
 802                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 803                         time_t t = time(NULL);
 804                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 805                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 806                         krb5_set_real_time(context, t + time_offset + 1, 0);
 807                 }
 808
 809                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 810                         creds_ready = True;
 811                 }
 812
 813                 i++;
 814         }
 815
 816         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 817                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 818                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 819                   (unsigned)credsp->times.endtime));
 820
 821         if (expire_time) {
 822                 *expire_time = (time_t)credsp->times.endtime;
 823         }
 824
 825         /* Allocate the auth_context. */
 826         retval = setup_auth_context(context, auth_context);
 827         if (retval) {
 828                 DEBUG(1,("setup_auth_context failed (%s)\n",
 829                         error_message(retval)));
 830                 goto cleanup_creds;
 831         }
 832
 833 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 834         if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 835                 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 836                  as part of the kerberos exchange. */
 837
 838                 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 839
 840                 retval = krb5_auth_con_setuseruserkey(context,
 841                                         *auth_context,
 842                                         &credsp->keyblock );
 843                 if (retval) {
 844                         DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 845                                 error_message(retval)));
 846                         goto cleanup_creds;
 847                 }
 848
 849                 /* Must use a subkey for forwarded tickets. */
 850                 retval = krb5_auth_con_setflags(context,
 851                                 *auth_context,
 852                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 853                 if (retval) {
 854                         DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 855                                 error_message(retval)));
 856                         goto cleanup_creds;
 857                 }
 858
 859                 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 860                                 *auth_context,  /* Authentication context [in] */
 861                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 862                                 credsp->client, /* Client principal for the tgt [in] */
 863                                 credsp->server, /* Server principal for the tgt [in] */
 864                                 ccache,         /* Credential cache to use for storage [in] */
 865                                 1,              /* Turn on for "Forwardable ticket" [in] */
 866                                 &in_data );     /* Resulting response [out] */
 867
 868                 if (retval) {
 869                         DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 870                                    error_message( retval ) ) );
 871
 872                         /*
 873                          * This is not fatal. Delete the *auth_context and continue
 874                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 875                          */
 876
 877                         if (in_data.data) {
 878                                 free( in_data.data );
 879                                 in_data.data = NULL;
 880                                 in_data.length = 0;
 881                         }
 882                         krb5_auth_con_free(context, *auth_context);
 883                         *auth_context = NULL;
 884                         retval = setup_auth_context(context, auth_context);
 885                         if (retval) {
 886                                 DEBUG(1,("setup_auth_context failed (%s)\n",
 887                                         error_message(retval)));
 888                                 goto cleanup_creds;
 889                         }
 890                 } else {
 891                         /* We got a delegated ticket. */
 892                         gss_flags |= GSS_C_DELEG_FLAG;
 893                 }
 894         }
 895
 896         /* Frees and reallocates in_data into a GSS checksum blob. */
 897         retval = create_gss_checksum(&in_data, gss_flags);
 898         if (retval) {
 899                 goto cleanup_data;
 900         }
 901
 902         /* We always want GSS-checksum types. */
 903         retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 904         if (retval) {
 905                 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 906                         error_message(retval)));
 907                 goto cleanup_data;
 908         }
 909 #endif
 910
 911         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 912                                       &in_data, credsp, outbuf);
 913         if (retval) {
 914                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 915                          error_message(retval)));
 916         }
 917
 918 cleanup_data:
 919         if (in_data.data) {
 920                 free( in_data.data );
 921                 in_data.length = 0;
 922         }
 923
 924         krb5_free_creds(context, credsp);
 925
 926 cleanup_creds:
 927         krb5_free_cred_contents(context, &creds);
 928
 929 cleanup_princ:
 930         krb5_free_principal(context, server);
 931         if (impersonate_princ) {
 932                 krb5_free_principal(context, impersonate_princ);
 933         }
 934
 935         return retval;
 936 }
 937
 938 /*
 939   get a kerberos5 ticket for the given service
 940 */
 941 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 942                         const char *principal, time_t time_offset,
 943                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 944                         uint32_t extra_ap_opts, const char *ccname,
 945                         time_t *tgs_expire,
 946                         const char *impersonate_princ_s)
 947
 948 {
 949         krb5_error_code retval;
 950         krb5_data packet;
 951         krb5_context context = NULL;
 952         krb5_ccache ccdef = NULL;
 953         krb5_auth_context auth_context = NULL;
 954         krb5_enctype enc_types[] = {
 955                 ENCTYPE_ARCFOUR_HMAC,
 956                 ENCTYPE_DES_CBC_MD5,
 957                 ENCTYPE_DES_CBC_CRC,
 958                 ENCTYPE_NULL};
 959
 960         initialize_krb5_error_table();
 961         retval = krb5_init_context(&context);
 962         if (retval) {
 963                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 964                          error_message(retval)));
 965                 goto failed;
 966         }
 967
 968         if (time_offset != 0) {
 969                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 970         }
 971
 972         if ((retval = krb5_cc_resolve(context, ccname ?
 973                         ccname : krb5_cc_default_name(context), &ccdef))) {
 974                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 975                          error_message(retval)));
 976                 goto failed;
 977         }
 978
 979         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 980                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 981                          error_message(retval)));
 982                 goto failed;
 983         }
 984
 985         retval = ads_krb5_mk_req(context, &auth_context,
 986                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 987                                 principal, ccdef, &packet,
 988                                 tgs_expire, impersonate_princ_s);
 989         if (retval) {
 990                 goto failed;
 991         }
 992
 993         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 994                                  session_key_krb5, false);
 995
 996         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 997
 998         kerberos_free_data_contents(context, &packet);
 999
1000 failed:
1001
1002         if (context) {
1003                 if (ccdef)
1004                         krb5_cc_close(context, ccdef);
1005                 if (auth_context)
1006                         krb5_auth_con_free(context, auth_context);
1007                 krb5_free_context(context);
1008         }
1009
1010         return retval;
1011 }
1012
1013 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
1014                               krb5_context context,
1015                               krb5_auth_context auth_context,
1016                               DATA_BLOB *session_key, bool remote)
1017 {
1018         krb5_keyblock *skey = NULL;
1019         krb5_error_code err = 0;
1020         bool ret = false;
1021
1022         if (remote) {
1023                 err = krb5_auth_con_getremotesubkey(context,
1024                                                     auth_context, &skey);
1025         } else {
1026                 err = krb5_auth_con_getlocalsubkey(context,
1027                                                    auth_context, &skey);
1028         }
1029
1030         if (err || skey == NULL) {
1031                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1032                 goto done;
1033         }
1034
1035         DEBUG(10, ("Got KRB5 session key of length %d\n",
1036                    (int)KRB5_KEY_LENGTH(skey)));
1037
1038         *session_key = data_blob_talloc(mem_ctx,
1039                                          KRB5_KEY_DATA(skey),
1040                                          KRB5_KEY_LENGTH(skey));
1041         dump_data_pw("KRB5 Session Key:\n",
1042                      session_key->data,
1043                      session_key->length);
1044
1045         ret = true;
1046
1047 done:
1048         if (skey) {
1049                 krb5_free_keyblock(context, skey);
1050         }
1051
1052         return ret;
1053 }
1054
1055
1056 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
1057  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
1058
1059  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
1060 {
1061         static krb5_data kdata;
1062
1063         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
1064         kdata.length = strlen((const char *)kdata.data);
1065         return &kdata;
1066 }
1067 #endif
1068
1069  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
1070 {
1071 /* Try krb5_free_keytab_entry_contents first, since
1072  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1073  * krb5_kt_free_entry but only has a prototype for the first, while the
1074  * second is considered private.
1075  */
1076 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1077         return krb5_free_keytab_entry_contents(context, kt_entry);
1078 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1079         return krb5_kt_free_entry(context, kt_entry);
1080 #else
1081 #error UNKNOWN_KT_FREE_FUNCTION
1082 #endif
1083 }
1084
1085  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1086                                      struct PAC_SIGNATURE_DATA *sig)
1087 {
1088 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1089         cksum->cksumtype        = (krb5_cksumtype)sig->type;
1090         cksum->checksum.length  = sig->signature.length;
1091         cksum->checksum.data    = sig->signature.data;
1092 #else
1093         cksum->checksum_type    = (krb5_cksumtype)sig->type;
1094         cksum->length           = sig->signature.length;
1095         cksum->contents         = sig->signature.data;
1096 #endif
1097 }
1098
1099  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1100                                           const krb5_keyblock *keyblock,
1101                                          krb5_keyusage usage,
1102                                          krb5_checksum *cksum,
1103                                          uint8 *data,
1104                                          size_t length)
1105 {
1106         krb5_error_code ret;
1107
1108         /* verify the checksum */
1109
1110         /* welcome to the wonderful world of samba's kerberos abstraction layer:
1111          *
1112          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
1113          * -----------------------------------------------------------------------------
1114          * krb5_c_verify_checksum       -                       works           works
1115          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
1116          */
1117
1118 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1119         {
1120                 krb5_boolean checksum_valid = False;
1121                 krb5_data input;
1122
1123                 input.data = (char *)data;
1124                 input.length = length;
1125
1126                 ret = krb5_c_verify_checksum(context,
1127                                              keyblock,
1128                                              usage,
1129                                              &input,
1130                                              cksum,
1131                                              &checksum_valid);
1132                 if (ret) {
1133                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1134                                 error_message(ret)));
1135                         return ret;
1136                 }
1137
1138                 if (!checksum_valid)
1139                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1140         }
1141
1142 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1143
1144         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1145          * without enctype and it ignores any key_usage types - Guenther */
1146
1147         {
1148
1149                 krb5_crypto crypto;
1150                 ret = krb5_crypto_init(context,
1151                                        keyblock,
1152                                        0,
1153                                        &crypto);
1154                 if (ret) {
1155                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1156                                 error_message(ret)));
1157                         return ret;
1158                 }
1159
1160                 ret = krb5_verify_checksum(context,
1161                                            crypto,
1162                                            usage,
1163                                            data,
1164                                            length,
1165                                            cksum);
1166
1167                 krb5_crypto_destroy(context, crypto);
1168         }
1169
1170 #else
1171 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1172 #endif
1173
1174         return ret;
1175 }
1176
1177  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1178 {
1179 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1180         return tkt->enc_part2->times.authtime;
1181 #else
1182         return tkt->ticket.authtime;
1183 #endif
1184 }
1185
1186 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1187 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1188 {
1189 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1190         if (ap_req->ticket->enc_part.kvno)
1191                 return ap_req->ticket->enc_part.kvno;
1192 #else /* Heimdal */
1193         if (ap_req->ticket.enc_part.kvno)
1194                 return *ap_req->ticket.enc_part.kvno;
1195 #endif
1196         return 0;
1197 }
1198
1199 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1200 {
1201 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1202         return ap_req->ticket.enc_part.etype;
1203 #else /* MIT */
1204         return ap_req->ticket->enc_part.enctype;
1205 #endif
1206 }
1207 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1208
1209 static krb5_error_code
1210 get_key_from_keytab(krb5_context context,
1211                     krb5_const_principal server,
1212                     krb5_enctype enctype,
1213                     krb5_kvno kvno,
1214                     krb5_keyblock **out_key)
1215 {
1216         krb5_keytab_entry entry;
1217         krb5_error_code ret;
1218         krb5_keytab keytab;
1219         char *name = NULL;
1220         krb5_keyblock *keyp;
1221
1222         /* We have to open a new keytab handle here, as MIT does
1223            an implicit open/getnext/close on krb5_kt_get_entry. We
1224            may be in the middle of a keytab enumeration when this is
1225            called. JRA. */
1226
1227         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1228         if (ret) {
1229                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1230                 return ret;
1231         }
1232
1233         if ( DEBUGLEVEL >= 10 ) {
1234                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1235                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1236                                 kvno, enctype, name));
1237                         TALLOC_FREE(name);
1238                 }
1239         }
1240
1241         ret = krb5_kt_get_entry(context,
1242                                 keytab,
1243                                 server,
1244                                 kvno,
1245                                 enctype,
1246                                 &entry);
1247
1248         if (ret) {
1249                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1250                 goto out;
1251         }
1252
1253         keyp = KRB5_KT_KEY(&entry);
1254
1255         ret = krb5_copy_keyblock(context, keyp, out_key);
1256         if (ret) {
1257                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1258                 goto out;
1259         }
1260
1261         smb_krb5_kt_free_entry(context, &entry);
1262
1263 out:
1264         krb5_kt_close(context, keytab);
1265         return ret;
1266 }
1267
1268 /* Prototypes */
1269
1270  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1271                                                  const krb5_data *inbuf,
1272                                                  krb5_kvno *kvno,
1273                                                  krb5_enctype *enctype)
1274 {
1275 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1276         {
1277                 krb5_error_code ret;
1278                 krb5_ap_req ap_req;
1279
1280                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1281                 if (ret)
1282                         return ret;
1283
1284                 *kvno = get_kvno_from_ap_req(&ap_req);
1285                 *enctype = get_enctype_from_ap_req(&ap_req);
1286
1287                 free_AP_REQ(&ap_req);
1288                 return 0;
1289         }
1290 #endif
1291
1292         /* Possibly not an appropriate error code. */
1293         return KRB5KDC_ERR_BADOPTION;
1294 }
1295
1296  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1297                                                         krb5_auth_context *auth_context,
1298                                                         const krb5_data *inbuf,
1299                                                         krb5_const_principal server,
1300                                                         krb5_keytab keytab,
1301                                                         krb5_flags *ap_req_options,
1302                                                         krb5_ticket **ticket,
1303                                                         krb5_keyblock **keyblock)
1304 {
1305         krb5_error_code ret;
1306         krb5_kvno kvno;
1307         krb5_enctype enctype;
1308         krb5_keyblock *local_keyblock;
1309
1310         ret = krb5_rd_req(context,
1311                           auth_context,
1312                           inbuf,
1313                           server,
1314                           keytab,
1315                           ap_req_options,
1316                           ticket);
1317         if (ret) {
1318                 return ret;
1319         }
1320
1321 #ifdef KRB5_TICKET_HAS_KEYINFO
1322         enctype = (*ticket)->enc_part.enctype;
1323         kvno = (*ticket)->enc_part.kvno;
1324 #else
1325         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1326         if (ret) {
1327                 return ret;
1328         }
1329 #endif
1330
1331         ret = get_key_from_keytab(context,
1332                                   server,
1333                                   enctype,
1334                                   kvno,
1335                                   &local_keyblock);
1336         if (ret) {
1337                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1338                 goto out;
1339         }
1340
1341 out:
1342         if (ret && local_keyblock != NULL) {
1343                 krb5_free_keyblock(context, local_keyblock);
1344         } else {
1345                 *keyblock = local_keyblock;
1346         }
1347
1348         return ret;
1349 }
1350
1351  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1352                                             const char *name,
1353                                             krb5_principal *principal)
1354 {
1355 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1356         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1357 #endif
1358
1359         /* we are cheating here because parse_name will in fact set the realm.
1360          * We don't care as the only caller of smb_krb5_parse_name_norealm
1361          * ignores the realm anyway when calling
1362          * smb_krb5_principal_compare_any_realm later - Guenther */
1363
1364         return smb_krb5_parse_name(context, name, principal);
1365 }
1366
1367  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1368                                           krb5_const_principal princ1,
1369                                           krb5_const_principal princ2)
1370 {
1371 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1372
1373         return krb5_principal_compare_any_realm(context, princ1, princ2);
1374
1375 /* krb5_princ_size is a macro in MIT */
1376 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1377
1378         int i, len1, len2;
1379         const krb5_data *p1, *p2;
1380
1381         len1 = krb5_princ_size(context, princ1);
1382         len2 = krb5_princ_size(context, princ2);
1383
1384         if (len1 != len2)
1385                 return False;
1386
1387         for (i = 0; i < len1; i++) {
1388
1389                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1390                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1391
1392                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1393                         return False;
1394         }
1395
1396         return True;
1397 #else
1398 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1399 #endif
1400 }
1401
1402  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1403                                        const char *client_string,       /* gd@BER.SUSE.DE */
1404                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1405                                        time_t *expire_time)
1406 {
1407         krb5_error_code ret;
1408         krb5_context context = NULL;
1409         krb5_ccache ccache = NULL;
1410         krb5_principal client = NULL;
1411         krb5_creds creds, creds_in, *creds_out = NULL;
1412
1413         ZERO_STRUCT(creds);
1414         ZERO_STRUCT(creds_in);
1415
1416         initialize_krb5_error_table();
1417         ret = krb5_init_context(&context);
1418         if (ret) {
1419                 goto done;
1420         }
1421
1422         if (!ccache_string) {
1423                 ccache_string = krb5_cc_default_name(context);
1424         }
1425
1426         if (!ccache_string) {
1427                 ret = EINVAL;
1428                 goto done;
1429         }
1430
1431         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1432
1433         /* FIXME: we should not fall back to defaults */
1434         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1435         if (ret) {
1436                 goto done;
1437         }
1438
1439         if (client_string) {
1440                 ret = smb_krb5_parse_name(context, client_string, &client);
1441                 if (ret) {
1442                         goto done;
1443                 }
1444         } else {
1445                 ret = krb5_cc_get_principal(context, ccache, &client);
1446                 if (ret) {
1447                         goto done;
1448                 }
1449         }
1450
1451 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1452         {
1453                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1454                 if (ret) {
1455                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1456                         goto done;
1457                 }
1458         }
1459 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1460         {
1461                 krb5_kdc_flags flags;
1462                 krb5_realm *client_realm = NULL;
1463
1464                 ret = krb5_copy_principal(context, client, &creds_in.client);
1465                 if (ret) {
1466                         goto done;
1467                 }
1468
1469                 if (service_string) {
1470                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1471                         if (ret) {
1472                                 goto done;
1473                         }
1474                 } else {
1475                         /* build tgt service by default */
1476                         client_realm = krb5_princ_realm(context, creds_in.client);
1477                         if (!client_realm) {
1478                                 ret = ENOMEM;
1479                                 goto done;
1480                         }
1481                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1482                         if (ret) {
1483                                 goto done;
1484                         }
1485                 }
1486
1487                 flags.i = 0;
1488                 flags.b.renewable = flags.b.renew = True;
1489
1490                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1491                 if (ret) {
1492                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1493                         goto done;
1494                 }
1495
1496                 creds = *creds_out;
1497         }
1498 #else
1499 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1500 #endif
1501
1502         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1503         ret = krb5_cc_initialize(context, ccache, client);
1504         if (ret) {
1505                 goto done;
1506         }
1507
1508         ret = krb5_cc_store_cred(context, ccache, &creds);
1509
1510         if (expire_time) {
1511                 *expire_time = (time_t) creds.times.endtime;
1512         }
1513
1514 done:
1515         krb5_free_cred_contents(context, &creds_in);
1516
1517         if (creds_out) {
1518                 krb5_free_creds(context, creds_out);
1519         } else {
1520                 krb5_free_cred_contents(context, &creds);
1521         }
1522
1523         if (client) {
1524                 krb5_free_principal(context, client);
1525         }
1526         if (ccache) {
1527                 krb5_cc_close(context, ccache);
1528         }
1529         if (context) {
1530                 krb5_free_context(context);
1531         }
1532
1533         return ret;
1534 }
1535
1536  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1537 {
1538         krb5_error_code ret = 0;
1539         if (addr == NULL) {
1540                 return ret;
1541         }
1542 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1543         krb5_free_addresses(context, addr->addrs);
1544 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1545         ret = krb5_free_addresses(context, addr->addrs);
1546         SAFE_FREE(addr->addrs);
1547 #endif
1548         SAFE_FREE(addr);
1549         addr = NULL;
1550         return ret;
1551 }
1552
1553  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1554 {
1555         krb5_error_code ret = 0;
1556         nstring buf;
1557 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1558         krb5_address **addrs = NULL;
1559 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1560         krb5_addresses *addrs = NULL;
1561 #endif
1562
1563         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1564         if (*kerb_addr == NULL) {
1565                 return ENOMEM;
1566         }
1567
1568         put_name(buf, global_myname(), ' ', 0x20);
1569
1570 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1571         {
1572                 int num_addr = 2;
1573
1574                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1575                 if (addrs == NULL) {
1576                         SAFE_FREE(*kerb_addr);
1577                         return ENOMEM;
1578                 }
1579
1580                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1581
1582                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1583                 if (addrs[0] == NULL) {
1584                         SAFE_FREE(addrs);
1585                         SAFE_FREE(*kerb_addr);
1586                         return ENOMEM;
1587                 }
1588
1589                 addrs[0]->magic = KV5M_ADDRESS;
1590                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1591                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1592                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1593                 if (addrs[0]->contents == NULL) {
1594                         SAFE_FREE(addrs[0]);
1595                         SAFE_FREE(addrs);
1596                         SAFE_FREE(*kerb_addr);
1597                         return ENOMEM;
1598                 }
1599
1600                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1601
1602                 addrs[1] = NULL;
1603         }
1604 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1605         {
1606                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1607                 if (addrs == NULL) {
1608                         SAFE_FREE(*kerb_addr);
1609                         return ENOMEM;
1610                 }
1611
1612                 memset(addrs, 0, sizeof(krb5_addresses));
1613
1614                 addrs->len = 1;
1615                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1616                 if (addrs->val == NULL) {
1617                         SAFE_FREE(addrs);
1618                         SAFE_FREE(kerb_addr);
1619                         return ENOMEM;
1620                 }
1621
1622                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1623                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1624                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1625                 if (addrs->val[0].address.data == NULL) {
1626                         SAFE_FREE(addrs->val);
1627                         SAFE_FREE(addrs);
1628                         SAFE_FREE(*kerb_addr);
1629                         return ENOMEM;
1630                 }
1631
1632                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1633         }
1634 #else
1635 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1636 #endif
1637         (*kerb_addr)->addrs = addrs;
1638
1639         return ret;
1640 }
1641
1642  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1643 {
1644 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1645         krb5_free_error_contents(context, krberror);
1646 #else /* MIT */
1647         krb5_free_error(context, krberror);
1648 #endif
1649 }
1650
1651  krb5_error_code handle_krberror_packet(krb5_context context,
1652                                         krb5_data *packet)
1653 {
1654         krb5_error_code ret;
1655         bool got_error_code = False;
1656
1657         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1658
1659 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1660         {
1661                 krb5_error krberror;
1662
1663                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1664                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1665                                 error_message(ret)));
1666                         return ret;
1667                 }
1668
1669                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1670                         ret = (krb5_error_code) krberror.error_code;
1671                         got_error_code = True;
1672                 }
1673
1674                 smb_krb5_free_error(context, &krberror);
1675         }
1676 #else /* MIT */
1677         {
1678                 krb5_error *krberror;
1679
1680                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1681                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1682                                 error_message(ret)));
1683                         return ret;
1684                 }
1685
1686                 if (krberror->e_data.data == NULL) {
1687 #if defined(ERROR_TABLE_BASE_krb5)
1688                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1689 #else
1690                         ret = (krb5_error_code)krberror->error;
1691 #endif
1692                         got_error_code = True;
1693                 }
1694                 smb_krb5_free_error(context, krberror);
1695         }
1696 #endif
1697         if (got_error_code) {
1698                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1699                         error_message(ret), ret));
1700         }
1701         return ret;
1702 }
1703
1704  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1705                                             krb5_get_init_creds_opt **opt)
1706 {
1707 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1708         /* Heimdal or modern MIT version */
1709         return krb5_get_init_creds_opt_alloc(context, opt);
1710 #else
1711         /* Historical MIT version */
1712         krb5_get_init_creds_opt *my_opt;
1713
1714         *opt = NULL;
1715
1716         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1717                 return ENOMEM;
1718         }
1719
1720         krb5_get_init_creds_opt_init(my_opt);
1721
1722         *opt =  my_opt;
1723         return 0;
1724 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1725 }
1726
1727  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1728                                 krb5_get_init_creds_opt *opt)
1729 {
1730 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1731
1732 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1733         /* Modern MIT or Heimdal version */
1734         krb5_get_init_creds_opt_free(context, opt);
1735 #else
1736         /* Heimdal version */
1737         krb5_get_init_creds_opt_free(opt);
1738 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1739
1740 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1741         /* Historical MIT version */
1742         SAFE_FREE(opt);
1743         opt = NULL;
1744 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1745 }
1746
1747  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1748 {
1749         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1750 }
1751
1752
1753 /* caller needs to free etype_s */
1754  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1755                                             krb5_enctype enctype,
1756                                             char **etype_s)
1757 {
1758 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1759         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1760 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1761         char buf[256];
1762         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1763         if (ret) {
1764                 return ret;
1765         }
1766         *etype_s = SMB_STRDUP(buf);
1767         if (!*etype_s) {
1768                 return ENOMEM;
1769         }
1770         return ret;
1771 #else
1772 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1773 #endif
1774 }
1775
1776  krb5_error_code smb_krb5_mk_error(krb5_context context,
1777                                 krb5_error_code error_code,
1778                                 const krb5_principal server,
1779                                 krb5_data *reply)
1780 {
1781 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1782         /*
1783          * The MIT interface is *terrible*.
1784          * We have to construct this ourselves...
1785          */
1786         krb5_error e;
1787
1788         memset(&e, 0, sizeof(e));
1789         krb5_us_timeofday(context, &e.stime, &e.susec);
1790         e.server = server;
1791 #if defined(krb5_err_base)
1792         e.error = error_code - krb5_err_base;
1793 #elif defined(ERROR_TABLE_BASE_krb5)
1794         e.error = error_code - ERROR_TABLE_BASE_krb5;
1795 #else
1796         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1797 #endif
1798
1799         return krb5_mk_error(context, &e, reply);
1800 #else /* Heimdal. */
1801         return krb5_mk_error(context,
1802                                 error_code,
1803                                 NULL,
1804                                 NULL, /* e_data */
1805                                 NULL,
1806                                 server,
1807                                 NULL,
1808                                 NULL,
1809                                 reply);
1810 #endif
1811 }
1812
1813 /**********************************************************************
1814  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1815  * allows to process non-default keytab names.
1816  * @param context krb5_context
1817  * @param keytab_name_req string
1818  * @param write_access bool if writable keytab is required
1819  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1820  * @return krb5_error_code
1821 **********************************************************************/
1822
1823 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1824 #ifndef MAX_KEYTAB_NAME_LEN
1825 #define MAX_KEYTAB_NAME_LEN 1100
1826 #endif
1827
1828  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1829                                       const char *keytab_name_req,
1830                                       bool write_access,
1831                                       krb5_keytab *keytab)
1832 {
1833         krb5_error_code ret = 0;
1834         TALLOC_CTX *mem_ctx;
1835         char keytab_string[MAX_KEYTAB_NAME_LEN];
1836         char *kt_str = NULL;
1837         bool found_valid_name = False;
1838         const char *pragma = "FILE";
1839         const char *tmp = NULL;
1840
1841         if (!write_access && !keytab_name_req) {
1842                 /* caller just wants to read the default keytab readonly, so be it */
1843                 return krb5_kt_default(context, keytab);
1844         }
1845
1846         mem_ctx = talloc_init("smb_krb5_open_keytab");
1847         if (!mem_ctx) {
1848                 return ENOMEM;
1849         }
1850
1851 #ifdef HAVE_WRFILE_KEYTAB
1852         if (write_access) {
1853                 pragma = "WRFILE";
1854         }
1855 #endif
1856
1857         if (keytab_name_req) {
1858
1859                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1860                         ret = KRB5_CONFIG_NOTENUFSPACE;
1861                         goto out;
1862                 }
1863
1864                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1865                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1866                         tmp = keytab_name_req;
1867                         goto resolve;
1868                 }
1869
1870                 if (keytab_name_req[0] != '/') {
1871                         ret = KRB5_KT_BADNAME;
1872                         goto out;
1873                 }
1874
1875                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1876                 if (!tmp) {
1877                         ret = ENOMEM;
1878                         goto out;
1879                 }
1880
1881                 goto resolve;
1882         }
1883
1884         /* we need to handle more complex keytab_strings, like:
1885          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1886
1887         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1888         if (ret) {
1889                 goto out;
1890         }
1891
1892         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1893
1894         tmp = talloc_strdup(mem_ctx, keytab_string);
1895         if (!tmp) {
1896                 ret = ENOMEM;
1897                 goto out;
1898         }
1899
1900         if (strncmp(tmp, "ANY:", 4) == 0) {
1901                 tmp += 4;
1902         }
1903
1904         memset(&keytab_string, '\0', sizeof(keytab_string));
1905
1906         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1907                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1908                         found_valid_name = True;
1909                         tmp = kt_str;
1910                         tmp += 7;
1911                 }
1912
1913                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1914                         found_valid_name = True;
1915                         tmp = kt_str;
1916                         tmp += 5;
1917                 }
1918
1919                 if (tmp[0] == '/') {
1920                         /* Treat as a FILE: keytab definition. */
1921                         found_valid_name = true;
1922                 }
1923
1924                 if (found_valid_name) {
1925                         if (tmp[0] != '/') {
1926                                 ret = KRB5_KT_BADNAME;
1927                                 goto out;
1928                         }
1929
1930                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1931                         if (!tmp) {
1932                                 ret = ENOMEM;
1933                                 goto out;
1934                         }
1935                         break;
1936                 }
1937         }
1938
1939         if (!found_valid_name) {
1940                 ret = KRB5_KT_UNKNOWN_TYPE;
1941                 goto out;
1942         }
1943
1944  resolve:
1945         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1946         ret = krb5_kt_resolve(context, tmp, keytab);
1947
1948  out:
1949         TALLOC_FREE(mem_ctx);
1950         return ret;
1951 }
1952
1953 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1954                                      krb5_context context,
1955                                      krb5_keytab keytab,
1956                                      const char **keytab_name)
1957 {
1958         char keytab_string[MAX_KEYTAB_NAME_LEN];
1959         krb5_error_code ret = 0;
1960
1961         ret = krb5_kt_get_name(context, keytab,
1962                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1963         if (ret) {
1964                 return ret;
1965         }
1966
1967         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1968         if (!*keytab_name) {
1969                 return ENOMEM;
1970         }
1971
1972         return ret;
1973 }
1974
1975 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1976     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1977     defined(HAVE_KRB5_GET_CREDS)
1978 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1979                                                              krb5_ccache ccache,
1980                                                              krb5_principal me,
1981                                                              krb5_principal server,
1982                                                              krb5_principal impersonate_princ,
1983                                                              krb5_creds **out_creds)
1984 {
1985         krb5_error_code ret;
1986         krb5_get_creds_opt opt;
1987
1988         ret = krb5_get_creds_opt_alloc(context, &opt);
1989         if (ret) {
1990                 goto done;
1991         }
1992         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1993
1994         if (impersonate_princ) {
1995                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1996                                                          impersonate_princ);
1997                 if (ret) {
1998                         goto done;
1999                 }
2000         }
2001
2002         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2003         if (ret) {
2004                 goto done;
2005         }
2006
2007  done:
2008         if (opt) {
2009                 krb5_get_creds_opt_free(context, opt);
2010         }
2011         return ret;
2012 }
2013 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2014
2015 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2016 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2017                                                          krb5_ccache ccache,
2018                                                          krb5_principal me,
2019                                                          krb5_principal server,
2020                                                          krb5_principal impersonate_princ,
2021                                                          krb5_creds **out_creds)
2022 {
2023         krb5_error_code ret;
2024         krb5_creds in_creds;
2025
2026 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2027 krb5_error_code KRB5_CALLCONV
2028 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2029                               krb5_ccache ccache, krb5_creds *in_creds,
2030                               krb5_data *subject_cert,
2031                               krb5_creds **out_creds);
2032 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2033
2034         ZERO_STRUCT(in_creds);
2035
2036         if (impersonate_princ) {
2037
2038                 in_creds.server = me;
2039                 in_creds.client = impersonate_princ;
2040
2041                 ret = krb5_get_credentials_for_user(context,
2042                                                     0, /* krb5_flags options */
2043                                                     ccache,
2044                                                     &in_creds,
2045                                                     NULL, /* krb5_data *subject_cert */
2046                                                     out_creds);
2047         } else {
2048                 in_creds.client = me;
2049                 in_creds.server = server;
2050
2051                 ret = krb5_get_credentials(context, 0, ccache,
2052                                            &in_creds, out_creds);
2053         }
2054
2055         return ret;
2056 }
2057 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2058
2059 /*
2060  * smb_krb5_get_credentials
2061  *
2062  * @brief Get krb5 credentials for a server
2063  *
2064  * @param[in] context           An initialized krb5_context
2065  * @param[in] ccache            An initialized krb5_ccache
2066  * @param[in] me                The krb5_principal of the caller
2067  * @param[in] server            The krb5_principal of the requested service
2068  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2069  * @param[out] out_creds        The returned krb5_creds structure
2070  * @return krb5_error_code
2071  *
2072  */
2073 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2074                                          krb5_ccache ccache,
2075                                          krb5_principal me,
2076                                          krb5_principal server,
2077                                          krb5_principal impersonate_princ,
2078                                          krb5_creds **out_creds)
2079 {
2080         krb5_error_code ret;
2081         krb5_creds *creds = NULL;
2082
2083         *out_creds = NULL;
2084
2085         if (impersonate_princ) {
2086 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2087                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2088 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2089                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2090 #else
2091                 ret = ENOTSUP;
2092 #endif
2093         } else {
2094                 krb5_creds in_creds;
2095
2096                 ZERO_STRUCT(in_creds);
2097
2098                 in_creds.client = me;
2099                 in_creds.server = server;
2100
2101                 ret = krb5_get_credentials(context, 0, ccache,
2102                                            &in_creds, &creds);
2103         }
2104         if (ret) {
2105                 goto done;
2106         }
2107
2108         ret = krb5_cc_store_cred(context, ccache, creds);
2109         if (ret) {
2110                 goto done;
2111         }
2112
2113         if (out_creds) {
2114                 *out_creds = creds;
2115         }
2116
2117  done:
2118         if (creds && ret) {
2119                 krb5_free_creds(context, creds);
2120         }
2121
2122         return ret;
2123 }
2124
2125 /*
2126  * smb_krb5_get_creds
2127  *
2128  * @brief Get krb5 credentials for a server
2129  *
2130  * @param[in] server_s          The string name of the service
2131  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2132  * @param[in] cc                The krb5 credential cache string name (optional)
2133  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2134  * @param[out] creds_p          The returned krb5_creds structure
2135  * @return krb5_error_code
2136  *
2137  */
2138 krb5_error_code smb_krb5_get_creds(const char *server_s,
2139                                    time_t time_offset,
2140                                    const char *cc,
2141                                    const char *impersonate_princ_s,
2142                                    krb5_creds **creds_p)
2143 {
2144         krb5_error_code ret;
2145         krb5_context context = NULL;
2146         krb5_principal me = NULL;
2147         krb5_principal server = NULL;
2148         krb5_principal impersonate_princ = NULL;
2149         krb5_creds *creds = NULL;
2150         krb5_ccache ccache = NULL;
2151
2152         *creds_p = NULL;
2153
2154         initialize_krb5_error_table();
2155         ret = krb5_init_context(&context);
2156         if (ret) {
2157                 goto done;
2158         }
2159
2160         if (time_offset != 0) {
2161                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2162         }
2163
2164         ret = krb5_cc_resolve(context, cc ? cc :
2165                 krb5_cc_default_name(context), &ccache);
2166         if (ret) {
2167                 goto done;
2168         }
2169
2170         ret = krb5_cc_get_principal(context, ccache, &me);
2171         if (ret) {
2172                 goto done;
2173         }
2174
2175         ret = smb_krb5_parse_name(context, server_s, &server);
2176         if (ret) {
2177                 goto done;
2178         }
2179
2180         if (impersonate_princ_s) {
2181                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2182                                           &impersonate_princ);
2183                 if (ret) {
2184                         goto done;
2185                 }
2186         }
2187
2188         ret = smb_krb5_get_credentials(context, ccache,
2189                                        me, server, impersonate_princ,
2190                                        &creds);
2191         if (ret) {
2192                 goto done;
2193         }
2194
2195         ret = krb5_cc_store_cred(context, ccache, creds);
2196         if (ret) {
2197                 goto done;
2198         }
2199
2200         if (creds_p) {
2201                 *creds_p = creds;
2202         }
2203
2204         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2205                 server_s));
2206
2207         if (impersonate_princ_s) {
2208                 char *client = NULL;
2209
2210                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2211                 if (ret) {
2212                         goto done;
2213                 }
2214                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2215                         client));
2216                 TALLOC_FREE(client);
2217         }
2218
2219  done:
2220         if (!context) {
2221                 return ret;
2222         }
2223
2224         if (creds && ret) {
2225                 krb5_free_creds(context, creds);
2226         }
2227         if (server) {
2228                 krb5_free_principal(context, server);
2229         }
2230         if (me) {
2231                 krb5_free_principal(context, me);
2232         }
2233         if (impersonate_princ) {
2234                 krb5_free_principal(context, impersonate_princ);
2235         }
2236         if (ccache) {
2237                 krb5_cc_close(context, ccache);
2238         }
2239         krb5_free_context(context);
2240
2241         return ret;
2242 }
2243
2244 /*
2245  * smb_krb5_principal_get_realm
2246  *
2247  * @brief Get realm of a principal
2248  *
2249  * @param[in] context           The krb5_context
2250  * @param[in] principal         The principal
2251  * @return pointer to the realm
2252  *
2253  */
2254
2255 char *smb_krb5_principal_get_realm(krb5_context context,
2256                                    krb5_principal principal)
2257 {
2258 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2259         return krb5_principal_get_realm(context, principal);
2260 #elif defined(krb5_princ_realm) /* MIT */
2261         krb5_data *realm;
2262         realm = krb5_princ_realm(context, principal);
2263         return (char *)realm->data;
2264 #else
2265         return NULL;
2266 #endif
2267 }
2268
2269 #else /* HAVE_KRB5 */
2270  /* this saves a few linking headaches */
2271  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2272                         const char *principal, time_t time_offset,
2273                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2274                         uint32_t extra_ap_opts,
2275                         const char *ccname, time_t *tgs_expire,
2276                         const char *impersonate_princ_s)
2277 {
2278          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2279          return 1;
2280 }
2281
2282 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
2283 {
2284         DEBUG(0,("NO KERBEROS SUPPORT\n"));
2285         return false;
2286 }
2287
2288 #endif /* HAVE_KRB5 */