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_autofree_context(), &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_autofree_context(), &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         /* Precalculated MD5sum of NULL channel bindings (20 bytes) */
 708         /* Channel bindings are: (all ints encoded as little endian)
 709
 710                 [4 bytes] initiator_addrtype (255 for null bindings)
 711                 [4 bytes] initiator_address length
 712                         [n bytes] .. initiator_address data - not present
 713                                      in null bindings.
 714                 [4 bytes] acceptor_addrtype (255 for null bindings)
 715                 [4 bytes] acceptor_address length
 716                         [n bytes] .. acceptor_address data - not present
 717                                      in null bindings.
 718                 [4 bytes] application_data length
 719                         [n bytes] .. application_ data - not present
 720                                      in null bindings.
 721                 MD5 of this is ""\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18"
 722         */
 723
 724         memcpy(&gss_cksum[4],
 725                 "\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18",
 726                 GSSAPI_BNDLENGTH);
 727
 728         SIVAL(gss_cksum, 20, gss_flags);
 729
 730         if (orig_length) {
 731                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 732                 SSVAL(gss_cksum, 26, orig_length);
 733                 /* Copy the kerberos KRB_CRED data */
 734                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 735                 free(in_data->data);
 736                 in_data->data = NULL;
 737                 in_data->length = 0;
 738         }
 739         in_data->data = gss_cksum;
 740         in_data->length = base_cksum_size + orig_length;
 741         return 0;
 742 }
 743
 744 /*
 745   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 746 */
 747 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 748                                        krb5_auth_context *auth_context,
 749                                        const krb5_flags ap_req_options,
 750                                        const char *principal,
 751                                        krb5_ccache ccache,
 752                                        krb5_data *outbuf,
 753                                        time_t *expire_time,
 754                                        const char *impersonate_princ_s)
 755 {
 756         krb5_error_code           retval;
 757         krb5_principal    server;
 758         krb5_principal impersonate_princ = NULL;
 759         krb5_creds              * credsp;
 760         krb5_creds                creds;
 761         krb5_data in_data;
 762         bool creds_ready = False;
 763         int i = 0, maxtries = 3;
 764         uint32_t gss_flags = 0;
 765
 766         ZERO_STRUCT(in_data);
 767
 768         retval = smb_krb5_parse_name(context, principal, &server);
 769         if (retval) {
 770                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 771                 return retval;
 772         }
 773
 774         if (impersonate_princ_s) {
 775                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 776                                              &impersonate_princ);
 777                 if (retval) {
 778                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 779                         goto cleanup_princ;
 780                 }
 781         }
 782
 783         /* obtain ticket & session key */
 784         ZERO_STRUCT(creds);
 785         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 786                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 787                          error_message(retval)));
 788                 goto cleanup_princ;
 789         }
 790
 791         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 792                 /* This can commonly fail on smbd startup with no ticket in the cache.
 793                  * Report at higher level than 1. */
 794                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 795                          error_message(retval)));
 796                 goto cleanup_creds;
 797         }
 798
 799         while (!creds_ready && (i < maxtries)) {
 800
 801                 if ((retval = smb_krb5_get_credentials(context, ccache,
 802                                                        creds.client,
 803                                                        creds.server,
 804                                                        impersonate_princ,
 805                                                        &credsp))) {
 806                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 807                                 principal, error_message(retval)));
 808                         goto cleanup_creds;
 809                 }
 810
 811                 /* cope with ticket being in the future due to clock skew */
 812                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 813                         time_t t = time(NULL);
 814                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 815                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 816                         krb5_set_real_time(context, t + time_offset + 1, 0);
 817                 }
 818
 819                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 820                         creds_ready = True;
 821                 }
 822
 823                 i++;
 824         }
 825
 826         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 827                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 828                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 829                   (unsigned)credsp->times.endtime));
 830
 831         if (expire_time) {
 832                 *expire_time = (time_t)credsp->times.endtime;
 833         }
 834
 835         /* Allocate the auth_context. */
 836         retval = setup_auth_context(context, auth_context);
 837         if (retval) {
 838                 DEBUG(1,("setup_auth_context failed (%s)\n",
 839                         error_message(retval)));
 840                 goto cleanup_creds;
 841         }
 842
 843 #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)
 844         if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 845                 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 846                  as part of the kerberos exchange. */
 847
 848                 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 849
 850                 retval = krb5_auth_con_setuseruserkey(context,
 851                                         *auth_context,
 852                                         &credsp->keyblock );
 853                 if (retval) {
 854                         DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 855                                 error_message(retval)));
 856                         goto cleanup_creds;
 857                 }
 858
 859                 /* Must use a subkey for forwarded tickets. */
 860                 retval = krb5_auth_con_setflags(context,
 861                                 *auth_context,
 862                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 863                 if (retval) {
 864                         DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 865                                 error_message(retval)));
 866                         goto cleanup_creds;
 867                 }
 868
 869                 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 870                                 *auth_context,  /* Authentication context [in] */
 871                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 872                                 credsp->client, /* Client principal for the tgt [in] */
 873                                 credsp->server, /* Server principal for the tgt [in] */
 874                                 ccache,         /* Credential cache to use for storage [in] */
 875                                 1,              /* Turn on for "Forwardable ticket" [in] */
 876                                 &in_data );     /* Resulting response [out] */
 877
 878                 if (retval) {
 879                         DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 880                                    error_message( retval ) ) );
 881
 882                         /*
 883                          * This is not fatal. Delete the *auth_context and continue
 884                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 885                          */
 886
 887                         if (in_data.data) {
 888                                 free( in_data.data );
 889                                 in_data.data = NULL;
 890                                 in_data.length = 0;
 891                         }
 892                         krb5_auth_con_free(context, *auth_context);
 893                         *auth_context = NULL;
 894                         retval = setup_auth_context(context, auth_context);
 895                         if (retval) {
 896                                 DEBUG(1,("setup_auth_context failed (%s)\n",
 897                                         error_message(retval)));
 898                                 goto cleanup_creds;
 899                         }
 900                 } else {
 901                         /* We got a delegated ticket. */
 902                         gss_flags |= GSS_C_DELEG_FLAG;
 903                 }
 904         }
 905
 906         /* Frees and reallocates in_data into a GSS checksum blob. */
 907         retval = create_gss_checksum(&in_data, gss_flags);
 908         if (retval) {
 909                 goto cleanup_data;
 910         }
 911
 912         /* We always want GSS-checksum types. */
 913         retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 914         if (retval) {
 915                 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 916                         error_message(retval)));
 917                 goto cleanup_data;
 918         }
 919 #endif
 920
 921         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 922                                       &in_data, credsp, outbuf);
 923         if (retval) {
 924                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 925                          error_message(retval)));
 926         }
 927
 928 cleanup_data:
 929         if (in_data.data) {
 930                 free( in_data.data );
 931                 in_data.length = 0;
 932         }
 933
 934         krb5_free_creds(context, credsp);
 935
 936 cleanup_creds:
 937         krb5_free_cred_contents(context, &creds);
 938
 939 cleanup_princ:
 940         krb5_free_principal(context, server);
 941         if (impersonate_princ) {
 942                 krb5_free_principal(context, impersonate_princ);
 943         }
 944
 945         return retval;
 946 }
 947
 948 /*
 949   get a kerberos5 ticket for the given service
 950 */
 951 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 952                         const char *principal, time_t time_offset,
 953                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 954                         uint32_t extra_ap_opts, const char *ccname,
 955                         time_t *tgs_expire,
 956                         const char *impersonate_princ_s)
 957
 958 {
 959         krb5_error_code retval;
 960         krb5_data packet;
 961         krb5_context context = NULL;
 962         krb5_ccache ccdef = NULL;
 963         krb5_auth_context auth_context = NULL;
 964         krb5_enctype enc_types[] = {
 965                 ENCTYPE_ARCFOUR_HMAC,
 966                 ENCTYPE_DES_CBC_MD5,
 967                 ENCTYPE_DES_CBC_CRC,
 968                 ENCTYPE_NULL};
 969
 970         initialize_krb5_error_table();
 971         retval = krb5_init_context(&context);
 972         if (retval) {
 973                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 974                          error_message(retval)));
 975                 goto failed;
 976         }
 977
 978         if (time_offset != 0) {
 979                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 980         }
 981
 982         if ((retval = krb5_cc_resolve(context, ccname ?
 983                         ccname : krb5_cc_default_name(context), &ccdef))) {
 984                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 985                          error_message(retval)));
 986                 goto failed;
 987         }
 988
 989         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 990                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 991                          error_message(retval)));
 992                 goto failed;
 993         }
 994
 995         retval = ads_krb5_mk_req(context, &auth_context,
 996                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 997                                 principal, ccdef, &packet,
 998                                 tgs_expire, impersonate_princ_s);
 999         if (retval) {
1000                 goto failed;
1001         }
1002
1003         get_krb5_smb_session_key(mem_ctx, context, auth_context,
1004                                  session_key_krb5, false);
1005
1006         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
1007
1008         kerberos_free_data_contents(context, &packet);
1009
1010 failed:
1011
1012         if (context) {
1013                 if (ccdef)
1014                         krb5_cc_close(context, ccdef);
1015                 if (auth_context)
1016                         krb5_auth_con_free(context, auth_context);
1017                 krb5_free_context(context);
1018         }
1019
1020         return retval;
1021 }
1022
1023 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
1024                               krb5_context context,
1025                               krb5_auth_context auth_context,
1026                               DATA_BLOB *session_key, bool remote)
1027 {
1028         krb5_keyblock *skey = NULL;
1029         krb5_error_code err = 0;
1030         bool ret = false;
1031
1032         if (remote) {
1033                 err = krb5_auth_con_getremotesubkey(context,
1034                                                     auth_context, &skey);
1035         } else {
1036                 err = krb5_auth_con_getlocalsubkey(context,
1037                                                    auth_context, &skey);
1038         }
1039
1040         if (err || skey == NULL) {
1041                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1042                 goto done;
1043         }
1044
1045         DEBUG(10, ("Got KRB5 session key of length %d\n",
1046                    (int)KRB5_KEY_LENGTH(skey)));
1047
1048         *session_key = data_blob_talloc(mem_ctx,
1049                                          KRB5_KEY_DATA(skey),
1050                                          KRB5_KEY_LENGTH(skey));
1051         dump_data_pw("KRB5 Session Key:\n",
1052                      session_key->data,
1053                      session_key->length);
1054
1055         ret = true;
1056
1057 done:
1058         if (skey) {
1059                 krb5_free_keyblock(context, skey);
1060         }
1061
1062         return ret;
1063 }
1064
1065
1066 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
1067  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
1068
1069  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
1070 {
1071         static krb5_data kdata;
1072
1073         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
1074         kdata.length = strlen((const char *)kdata.data);
1075         return &kdata;
1076 }
1077 #endif
1078
1079  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
1080 {
1081 /* Try krb5_free_keytab_entry_contents first, since
1082  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1083  * krb5_kt_free_entry but only has a prototype for the first, while the
1084  * second is considered private.
1085  */
1086 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1087         return krb5_free_keytab_entry_contents(context, kt_entry);
1088 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1089         return krb5_kt_free_entry(context, kt_entry);
1090 #else
1091 #error UNKNOWN_KT_FREE_FUNCTION
1092 #endif
1093 }
1094
1095  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1096                                      struct PAC_SIGNATURE_DATA *sig)
1097 {
1098 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1099         cksum->cksumtype        = (krb5_cksumtype)sig->type;
1100         cksum->checksum.length  = sig->signature.length;
1101         cksum->checksum.data    = sig->signature.data;
1102 #else
1103         cksum->checksum_type    = (krb5_cksumtype)sig->type;
1104         cksum->length           = sig->signature.length;
1105         cksum->contents         = sig->signature.data;
1106 #endif
1107 }
1108
1109  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1110                                           const krb5_keyblock *keyblock,
1111                                          krb5_keyusage usage,
1112                                          krb5_checksum *cksum,
1113                                          uint8 *data,
1114                                          size_t length)
1115 {
1116         krb5_error_code ret;
1117
1118         /* verify the checksum */
1119
1120         /* welcome to the wonderful world of samba's kerberos abstraction layer:
1121          *
1122          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
1123          * -----------------------------------------------------------------------------
1124          * krb5_c_verify_checksum       -                       works           works
1125          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
1126          */
1127
1128 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1129         {
1130                 krb5_boolean checksum_valid = False;
1131                 krb5_data input;
1132
1133                 input.data = (char *)data;
1134                 input.length = length;
1135
1136                 ret = krb5_c_verify_checksum(context,
1137                                              keyblock,
1138                                              usage,
1139                                              &input,
1140                                              cksum,
1141                                              &checksum_valid);
1142                 if (ret) {
1143                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1144                                 error_message(ret)));
1145                         return ret;
1146                 }
1147
1148                 if (!checksum_valid)
1149                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1150         }
1151
1152 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1153
1154         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1155          * without enctype and it ignores any key_usage types - Guenther */
1156
1157         {
1158
1159                 krb5_crypto crypto;
1160                 ret = krb5_crypto_init(context,
1161                                        keyblock,
1162                                        0,
1163                                        &crypto);
1164                 if (ret) {
1165                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1166                                 error_message(ret)));
1167                         return ret;
1168                 }
1169
1170                 ret = krb5_verify_checksum(context,
1171                                            crypto,
1172                                            usage,
1173                                            data,
1174                                            length,
1175                                            cksum);
1176
1177                 krb5_crypto_destroy(context, crypto);
1178         }
1179
1180 #else
1181 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1182 #endif
1183
1184         return ret;
1185 }
1186
1187  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1188 {
1189 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1190         return tkt->enc_part2->times.authtime;
1191 #else
1192         return tkt->ticket.authtime;
1193 #endif
1194 }
1195
1196 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1197 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1198 {
1199 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1200         if (ap_req->ticket->enc_part.kvno)
1201                 return ap_req->ticket->enc_part.kvno;
1202 #else /* Heimdal */
1203         if (ap_req->ticket.enc_part.kvno)
1204                 return *ap_req->ticket.enc_part.kvno;
1205 #endif
1206         return 0;
1207 }
1208
1209 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1210 {
1211 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1212         return ap_req->ticket.enc_part.etype;
1213 #else /* MIT */
1214         return ap_req->ticket->enc_part.enctype;
1215 #endif
1216 }
1217 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1218
1219 static krb5_error_code
1220 get_key_from_keytab(krb5_context context,
1221                     krb5_const_principal server,
1222                     krb5_enctype enctype,
1223                     krb5_kvno kvno,
1224                     krb5_keyblock **out_key)
1225 {
1226         krb5_keytab_entry entry;
1227         krb5_error_code ret;
1228         krb5_keytab keytab;
1229         char *name = NULL;
1230         krb5_keyblock *keyp;
1231
1232         /* We have to open a new keytab handle here, as MIT does
1233            an implicit open/getnext/close on krb5_kt_get_entry. We
1234            may be in the middle of a keytab enumeration when this is
1235            called. JRA. */
1236
1237         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1238         if (ret) {
1239                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1240                 return ret;
1241         }
1242
1243         if ( DEBUGLEVEL >= 10 ) {
1244                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1245                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1246                                 kvno, enctype, name));
1247                         TALLOC_FREE(name);
1248                 }
1249         }
1250
1251         ret = krb5_kt_get_entry(context,
1252                                 keytab,
1253                                 server,
1254                                 kvno,
1255                                 enctype,
1256                                 &entry);
1257
1258         if (ret) {
1259                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1260                 goto out;
1261         }
1262
1263         keyp = KRB5_KT_KEY(&entry);
1264
1265         ret = krb5_copy_keyblock(context, keyp, out_key);
1266         if (ret) {
1267                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1268                 goto out;
1269         }
1270
1271         smb_krb5_kt_free_entry(context, &entry);
1272
1273 out:
1274         krb5_kt_close(context, keytab);
1275         return ret;
1276 }
1277
1278 /* Prototypes */
1279
1280  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1281                                                  const krb5_data *inbuf,
1282                                                  krb5_kvno *kvno,
1283                                                  krb5_enctype *enctype)
1284 {
1285 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1286         {
1287                 krb5_error_code ret;
1288                 krb5_ap_req ap_req;
1289
1290                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1291                 if (ret)
1292                         return ret;
1293
1294                 *kvno = get_kvno_from_ap_req(&ap_req);
1295                 *enctype = get_enctype_from_ap_req(&ap_req);
1296
1297                 free_AP_REQ(&ap_req);
1298                 return 0;
1299         }
1300 #endif
1301
1302         /* Possibly not an appropriate error code. */
1303         return KRB5KDC_ERR_BADOPTION;
1304 }
1305
1306  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1307                                                         krb5_auth_context *auth_context,
1308                                                         const krb5_data *inbuf,
1309                                                         krb5_const_principal server,
1310                                                         krb5_keytab keytab,
1311                                                         krb5_flags *ap_req_options,
1312                                                         krb5_ticket **ticket,
1313                                                         krb5_keyblock **keyblock)
1314 {
1315         krb5_error_code ret;
1316         krb5_kvno kvno;
1317         krb5_enctype enctype;
1318         krb5_keyblock *local_keyblock;
1319
1320         ret = krb5_rd_req(context,
1321                           auth_context,
1322                           inbuf,
1323                           server,
1324                           keytab,
1325                           ap_req_options,
1326                           ticket);
1327         if (ret) {
1328                 return ret;
1329         }
1330
1331 #ifdef KRB5_TICKET_HAS_KEYINFO
1332         enctype = (*ticket)->enc_part.enctype;
1333         kvno = (*ticket)->enc_part.kvno;
1334 #else
1335         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1336         if (ret) {
1337                 return ret;
1338         }
1339 #endif
1340
1341         ret = get_key_from_keytab(context,
1342                                   server,
1343                                   enctype,
1344                                   kvno,
1345                                   &local_keyblock);
1346         if (ret) {
1347                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1348                 goto out;
1349         }
1350
1351 out:
1352         if (ret && local_keyblock != NULL) {
1353                 krb5_free_keyblock(context, local_keyblock);
1354         } else {
1355                 *keyblock = local_keyblock;
1356         }
1357
1358         return ret;
1359 }
1360
1361  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1362                                             const char *name,
1363                                             krb5_principal *principal)
1364 {
1365 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1366         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1367 #endif
1368
1369         /* we are cheating here because parse_name will in fact set the realm.
1370          * We don't care as the only caller of smb_krb5_parse_name_norealm
1371          * ignores the realm anyway when calling
1372          * smb_krb5_principal_compare_any_realm later - Guenther */
1373
1374         return smb_krb5_parse_name(context, name, principal);
1375 }
1376
1377  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1378                                           krb5_const_principal princ1,
1379                                           krb5_const_principal princ2)
1380 {
1381 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1382
1383         return krb5_principal_compare_any_realm(context, princ1, princ2);
1384
1385 /* krb5_princ_size is a macro in MIT */
1386 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1387
1388         int i, len1, len2;
1389         const krb5_data *p1, *p2;
1390
1391         len1 = krb5_princ_size(context, princ1);
1392         len2 = krb5_princ_size(context, princ2);
1393
1394         if (len1 != len2)
1395                 return False;
1396
1397         for (i = 0; i < len1; i++) {
1398
1399                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1400                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1401
1402                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1403                         return False;
1404         }
1405
1406         return True;
1407 #else
1408 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1409 #endif
1410 }
1411
1412  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1413                                        const char *client_string,       /* gd@BER.SUSE.DE */
1414                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1415                                        time_t *expire_time)
1416 {
1417         krb5_error_code ret;
1418         krb5_context context = NULL;
1419         krb5_ccache ccache = NULL;
1420         krb5_principal client = NULL;
1421         krb5_creds creds, creds_in, *creds_out = NULL;
1422
1423         ZERO_STRUCT(creds);
1424         ZERO_STRUCT(creds_in);
1425
1426         initialize_krb5_error_table();
1427         ret = krb5_init_context(&context);
1428         if (ret) {
1429                 goto done;
1430         }
1431
1432         if (!ccache_string) {
1433                 ccache_string = krb5_cc_default_name(context);
1434         }
1435
1436         if (!ccache_string) {
1437                 ret = EINVAL;
1438                 goto done;
1439         }
1440
1441         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1442
1443         /* FIXME: we should not fall back to defaults */
1444         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1445         if (ret) {
1446                 goto done;
1447         }
1448
1449         if (client_string) {
1450                 ret = smb_krb5_parse_name(context, client_string, &client);
1451                 if (ret) {
1452                         goto done;
1453                 }
1454         } else {
1455                 ret = krb5_cc_get_principal(context, ccache, &client);
1456                 if (ret) {
1457                         goto done;
1458                 }
1459         }
1460
1461 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1462         {
1463                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1464                 if (ret) {
1465                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1466                         goto done;
1467                 }
1468         }
1469 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1470         {
1471                 krb5_kdc_flags flags;
1472                 krb5_realm *client_realm = NULL;
1473
1474                 ret = krb5_copy_principal(context, client, &creds_in.client);
1475                 if (ret) {
1476                         goto done;
1477                 }
1478
1479                 if (service_string) {
1480                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1481                         if (ret) {
1482                                 goto done;
1483                         }
1484                 } else {
1485                         /* build tgt service by default */
1486                         client_realm = krb5_princ_realm(context, creds_in.client);
1487                         if (!client_realm) {
1488                                 ret = ENOMEM;
1489                                 goto done;
1490                         }
1491                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1492                         if (ret) {
1493                                 goto done;
1494                         }
1495                 }
1496
1497                 flags.i = 0;
1498                 flags.b.renewable = flags.b.renew = True;
1499
1500                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1501                 if (ret) {
1502                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1503                         goto done;
1504                 }
1505
1506                 creds = *creds_out;
1507         }
1508 #else
1509 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1510 #endif
1511
1512         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1513         ret = krb5_cc_initialize(context, ccache, client);
1514         if (ret) {
1515                 goto done;
1516         }
1517
1518         ret = krb5_cc_store_cred(context, ccache, &creds);
1519
1520         if (expire_time) {
1521                 *expire_time = (time_t) creds.times.endtime;
1522         }
1523
1524 done:
1525         krb5_free_cred_contents(context, &creds_in);
1526
1527         if (creds_out) {
1528                 krb5_free_creds(context, creds_out);
1529         } else {
1530                 krb5_free_cred_contents(context, &creds);
1531         }
1532
1533         if (client) {
1534                 krb5_free_principal(context, client);
1535         }
1536         if (ccache) {
1537                 krb5_cc_close(context, ccache);
1538         }
1539         if (context) {
1540                 krb5_free_context(context);
1541         }
1542
1543         return ret;
1544 }
1545
1546  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1547 {
1548         krb5_error_code ret = 0;
1549         if (addr == NULL) {
1550                 return ret;
1551         }
1552 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1553         krb5_free_addresses(context, addr->addrs);
1554 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1555         ret = krb5_free_addresses(context, addr->addrs);
1556         SAFE_FREE(addr->addrs);
1557 #endif
1558         SAFE_FREE(addr);
1559         addr = NULL;
1560         return ret;
1561 }
1562
1563  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1564 {
1565         krb5_error_code ret = 0;
1566         nstring buf;
1567 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1568         krb5_address **addrs = NULL;
1569 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1570         krb5_addresses *addrs = NULL;
1571 #endif
1572
1573         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1574         if (*kerb_addr == NULL) {
1575                 return ENOMEM;
1576         }
1577
1578         put_name(buf, global_myname(), ' ', 0x20);
1579
1580 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1581         {
1582                 int num_addr = 2;
1583
1584                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1585                 if (addrs == NULL) {
1586                         SAFE_FREE(*kerb_addr);
1587                         return ENOMEM;
1588                 }
1589
1590                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1591
1592                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1593                 if (addrs[0] == NULL) {
1594                         SAFE_FREE(addrs);
1595                         SAFE_FREE(*kerb_addr);
1596                         return ENOMEM;
1597                 }
1598
1599                 addrs[0]->magic = KV5M_ADDRESS;
1600                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1601                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1602                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1603                 if (addrs[0]->contents == NULL) {
1604                         SAFE_FREE(addrs[0]);
1605                         SAFE_FREE(addrs);
1606                         SAFE_FREE(*kerb_addr);
1607                         return ENOMEM;
1608                 }
1609
1610                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1611
1612                 addrs[1] = NULL;
1613         }
1614 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1615         {
1616                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1617                 if (addrs == NULL) {
1618                         SAFE_FREE(*kerb_addr);
1619                         return ENOMEM;
1620                 }
1621
1622                 memset(addrs, 0, sizeof(krb5_addresses));
1623
1624                 addrs->len = 1;
1625                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1626                 if (addrs->val == NULL) {
1627                         SAFE_FREE(addrs);
1628                         SAFE_FREE(kerb_addr);
1629                         return ENOMEM;
1630                 }
1631
1632                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1633                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1634                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1635                 if (addrs->val[0].address.data == NULL) {
1636                         SAFE_FREE(addrs->val);
1637                         SAFE_FREE(addrs);
1638                         SAFE_FREE(*kerb_addr);
1639                         return ENOMEM;
1640                 }
1641
1642                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1643         }
1644 #else
1645 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1646 #endif
1647         (*kerb_addr)->addrs = addrs;
1648
1649         return ret;
1650 }
1651
1652  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1653 {
1654 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1655         krb5_free_error_contents(context, krberror);
1656 #else /* MIT */
1657         krb5_free_error(context, krberror);
1658 #endif
1659 }
1660
1661  krb5_error_code handle_krberror_packet(krb5_context context,
1662                                         krb5_data *packet)
1663 {
1664         krb5_error_code ret;
1665         bool got_error_code = False;
1666
1667         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1668
1669 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1670         {
1671                 krb5_error krberror;
1672
1673                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1674                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1675                                 error_message(ret)));
1676                         return ret;
1677                 }
1678
1679                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1680                         ret = (krb5_error_code) krberror.error_code;
1681                         got_error_code = True;
1682                 }
1683
1684                 smb_krb5_free_error(context, &krberror);
1685         }
1686 #else /* MIT */
1687         {
1688                 krb5_error *krberror;
1689
1690                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1691                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1692                                 error_message(ret)));
1693                         return ret;
1694                 }
1695
1696                 if (krberror->e_data.data == NULL) {
1697 #if defined(ERROR_TABLE_BASE_krb5)
1698                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1699 #else
1700                         ret = (krb5_error_code)krberror->error;
1701 #endif
1702                         got_error_code = True;
1703                 }
1704                 smb_krb5_free_error(context, krberror);
1705         }
1706 #endif
1707         if (got_error_code) {
1708                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1709                         error_message(ret), ret));
1710         }
1711         return ret;
1712 }
1713
1714  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1715                                             krb5_get_init_creds_opt **opt)
1716 {
1717 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1718         /* Heimdal or modern MIT version */
1719         return krb5_get_init_creds_opt_alloc(context, opt);
1720 #else
1721         /* Historical MIT version */
1722         krb5_get_init_creds_opt *my_opt;
1723
1724         *opt = NULL;
1725
1726         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1727                 return ENOMEM;
1728         }
1729
1730         krb5_get_init_creds_opt_init(my_opt);
1731
1732         *opt =  my_opt;
1733         return 0;
1734 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1735 }
1736
1737  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1738                                 krb5_get_init_creds_opt *opt)
1739 {
1740 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1741
1742 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1743         /* Modern MIT or Heimdal version */
1744         krb5_get_init_creds_opt_free(context, opt);
1745 #else
1746         /* Heimdal version */
1747         krb5_get_init_creds_opt_free(opt);
1748 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1749
1750 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1751         /* Historical MIT version */
1752         SAFE_FREE(opt);
1753         opt = NULL;
1754 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1755 }
1756
1757  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1758 {
1759         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1760 }
1761
1762
1763 /* caller needs to free etype_s */
1764  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1765                                             krb5_enctype enctype,
1766                                             char **etype_s)
1767 {
1768 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1769         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1770 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1771         char buf[256];
1772         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1773         if (ret) {
1774                 return ret;
1775         }
1776         *etype_s = SMB_STRDUP(buf);
1777         if (!*etype_s) {
1778                 return ENOMEM;
1779         }
1780         return ret;
1781 #else
1782 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1783 #endif
1784 }
1785
1786  krb5_error_code smb_krb5_mk_error(krb5_context context,
1787                                 krb5_error_code error_code,
1788                                 const krb5_principal server,
1789                                 krb5_data *reply)
1790 {
1791 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1792         /*
1793          * The MIT interface is *terrible*.
1794          * We have to construct this ourselves...
1795          */
1796         krb5_error e;
1797
1798         memset(&e, 0, sizeof(e));
1799         krb5_us_timeofday(context, &e.stime, &e.susec);
1800         e.server = server;
1801 #if defined(krb5_err_base)
1802         e.error = error_code - krb5_err_base;
1803 #elif defined(ERROR_TABLE_BASE_krb5)
1804         e.error = error_code - ERROR_TABLE_BASE_krb5;
1805 #else
1806         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1807 #endif
1808
1809         return krb5_mk_error(context, &e, reply);
1810 #else /* Heimdal. */
1811         return krb5_mk_error(context,
1812                                 error_code,
1813                                 NULL,
1814                                 NULL, /* e_data */
1815                                 NULL,
1816                                 server,
1817                                 NULL,
1818                                 NULL,
1819                                 reply);
1820 #endif
1821 }
1822
1823 /**********************************************************************
1824  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1825  * allows to process non-default keytab names.
1826  * @param context krb5_context
1827  * @param keytab_name_req string
1828  * @param write_access bool if writable keytab is required
1829  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1830  * @return krb5_error_code
1831 **********************************************************************/
1832
1833 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1834 #ifndef MAX_KEYTAB_NAME_LEN
1835 #define MAX_KEYTAB_NAME_LEN 1100
1836 #endif
1837
1838  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1839                                       const char *keytab_name_req,
1840                                       bool write_access,
1841                                       krb5_keytab *keytab)
1842 {
1843         krb5_error_code ret = 0;
1844         TALLOC_CTX *mem_ctx;
1845         char keytab_string[MAX_KEYTAB_NAME_LEN];
1846         char *kt_str = NULL;
1847         bool found_valid_name = False;
1848         const char *pragma = "FILE";
1849         const char *tmp = NULL;
1850
1851         if (!write_access && !keytab_name_req) {
1852                 /* caller just wants to read the default keytab readonly, so be it */
1853                 return krb5_kt_default(context, keytab);
1854         }
1855
1856         mem_ctx = talloc_init("smb_krb5_open_keytab");
1857         if (!mem_ctx) {
1858                 return ENOMEM;
1859         }
1860
1861 #ifdef HAVE_WRFILE_KEYTAB
1862         if (write_access) {
1863                 pragma = "WRFILE";
1864         }
1865 #endif
1866
1867         if (keytab_name_req) {
1868
1869                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1870                         ret = KRB5_CONFIG_NOTENUFSPACE;
1871                         goto out;
1872                 }
1873
1874                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1875                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1876                         tmp = keytab_name_req;
1877                         goto resolve;
1878                 }
1879
1880                 if (keytab_name_req[0] != '/') {
1881                         ret = KRB5_KT_BADNAME;
1882                         goto out;
1883                 }
1884
1885                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1886                 if (!tmp) {
1887                         ret = ENOMEM;
1888                         goto out;
1889                 }
1890
1891                 goto resolve;
1892         }
1893
1894         /* we need to handle more complex keytab_strings, like:
1895          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1896
1897         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1898         if (ret) {
1899                 goto out;
1900         }
1901
1902         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1903
1904         tmp = talloc_strdup(mem_ctx, keytab_string);
1905         if (!tmp) {
1906                 ret = ENOMEM;
1907                 goto out;
1908         }
1909
1910         if (strncmp(tmp, "ANY:", 4) == 0) {
1911                 tmp += 4;
1912         }
1913
1914         memset(&keytab_string, '\0', sizeof(keytab_string));
1915
1916         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1917                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1918                         found_valid_name = True;
1919                         tmp = kt_str;
1920                         tmp += 7;
1921                 }
1922
1923                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1924                         found_valid_name = True;
1925                         tmp = kt_str;
1926                         tmp += 5;
1927                 }
1928
1929                 if (tmp[0] == '/') {
1930                         /* Treat as a FILE: keytab definition. */
1931                         found_valid_name = true;
1932                 }
1933
1934                 if (found_valid_name) {
1935                         if (tmp[0] != '/') {
1936                                 ret = KRB5_KT_BADNAME;
1937                                 goto out;
1938                         }
1939
1940                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1941                         if (!tmp) {
1942                                 ret = ENOMEM;
1943                                 goto out;
1944                         }
1945                         break;
1946                 }
1947         }
1948
1949         if (!found_valid_name) {
1950                 ret = KRB5_KT_UNKNOWN_TYPE;
1951                 goto out;
1952         }
1953
1954  resolve:
1955         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1956         ret = krb5_kt_resolve(context, tmp, keytab);
1957
1958  out:
1959         TALLOC_FREE(mem_ctx);
1960         return ret;
1961 }
1962
1963 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1964                                      krb5_context context,
1965                                      krb5_keytab keytab,
1966                                      const char **keytab_name)
1967 {
1968         char keytab_string[MAX_KEYTAB_NAME_LEN];
1969         krb5_error_code ret = 0;
1970
1971         ret = krb5_kt_get_name(context, keytab,
1972                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1973         if (ret) {
1974                 return ret;
1975         }
1976
1977         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1978         if (!*keytab_name) {
1979                 return ENOMEM;
1980         }
1981
1982         return ret;
1983 }
1984
1985 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1986     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1987     defined(HAVE_KRB5_GET_CREDS)
1988 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1989                                                              krb5_ccache ccache,
1990                                                              krb5_principal me,
1991                                                              krb5_principal server,
1992                                                              krb5_principal impersonate_princ,
1993                                                              krb5_creds **out_creds)
1994 {
1995         krb5_error_code ret;
1996         krb5_get_creds_opt opt;
1997
1998         ret = krb5_get_creds_opt_alloc(context, &opt);
1999         if (ret) {
2000                 goto done;
2001         }
2002         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
2003
2004         if (impersonate_princ) {
2005                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
2006                                                          impersonate_princ);
2007                 if (ret) {
2008                         goto done;
2009                 }
2010         }
2011
2012         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2013         if (ret) {
2014                 goto done;
2015         }
2016
2017  done:
2018         if (opt) {
2019                 krb5_get_creds_opt_free(context, opt);
2020         }
2021         return ret;
2022 }
2023 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2024
2025 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2026 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2027                                                          krb5_ccache ccache,
2028                                                          krb5_principal me,
2029                                                          krb5_principal server,
2030                                                          krb5_principal impersonate_princ,
2031                                                          krb5_creds **out_creds)
2032 {
2033         krb5_error_code ret;
2034         krb5_creds in_creds;
2035
2036 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2037 krb5_error_code KRB5_CALLCONV
2038 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2039                               krb5_ccache ccache, krb5_creds *in_creds,
2040                               krb5_data *subject_cert,
2041                               krb5_creds **out_creds);
2042 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2043
2044         ZERO_STRUCT(in_creds);
2045
2046         if (impersonate_princ) {
2047
2048                 in_creds.server = me;
2049                 in_creds.client = impersonate_princ;
2050
2051                 ret = krb5_get_credentials_for_user(context,
2052                                                     0, /* krb5_flags options */
2053                                                     ccache,
2054                                                     &in_creds,
2055                                                     NULL, /* krb5_data *subject_cert */
2056                                                     out_creds);
2057         } else {
2058                 in_creds.client = me;
2059                 in_creds.server = server;
2060
2061                 ret = krb5_get_credentials(context, 0, ccache,
2062                                            &in_creds, out_creds);
2063         }
2064
2065         return ret;
2066 }
2067 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2068
2069 /*
2070  * smb_krb5_get_credentials
2071  *
2072  * @brief Get krb5 credentials for a server
2073  *
2074  * @param[in] context           An initialized krb5_context
2075  * @param[in] ccache            An initialized krb5_ccache
2076  * @param[in] me                The krb5_principal of the caller
2077  * @param[in] server            The krb5_principal of the requested service
2078  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2079  * @param[out] out_creds        The returned krb5_creds structure
2080  * @return krb5_error_code
2081  *
2082  */
2083 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2084                                          krb5_ccache ccache,
2085                                          krb5_principal me,
2086                                          krb5_principal server,
2087                                          krb5_principal impersonate_princ,
2088                                          krb5_creds **out_creds)
2089 {
2090         krb5_error_code ret;
2091         krb5_creds *creds = NULL;
2092
2093         *out_creds = NULL;
2094
2095         if (impersonate_princ) {
2096 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2097                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2098 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2099                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2100 #else
2101                 ret = ENOTSUP;
2102 #endif
2103         } else {
2104                 krb5_creds in_creds;
2105
2106                 ZERO_STRUCT(in_creds);
2107
2108                 in_creds.client = me;
2109                 in_creds.server = server;
2110
2111                 ret = krb5_get_credentials(context, 0, ccache,
2112                                            &in_creds, &creds);
2113         }
2114         if (ret) {
2115                 goto done;
2116         }
2117
2118         ret = krb5_cc_store_cred(context, ccache, creds);
2119         if (ret) {
2120                 goto done;
2121         }
2122
2123         if (out_creds) {
2124                 *out_creds = creds;
2125         }
2126
2127  done:
2128         if (creds && ret) {
2129                 krb5_free_creds(context, creds);
2130         }
2131
2132         return ret;
2133 }
2134
2135 /*
2136  * smb_krb5_get_creds
2137  *
2138  * @brief Get krb5 credentials for a server
2139  *
2140  * @param[in] server_s          The string name of the service
2141  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2142  * @param[in] cc                The krb5 credential cache string name (optional)
2143  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2144  * @param[out] creds_p          The returned krb5_creds structure
2145  * @return krb5_error_code
2146  *
2147  */
2148 krb5_error_code smb_krb5_get_creds(const char *server_s,
2149                                    time_t time_offset,
2150                                    const char *cc,
2151                                    const char *impersonate_princ_s,
2152                                    krb5_creds **creds_p)
2153 {
2154         krb5_error_code ret;
2155         krb5_context context = NULL;
2156         krb5_principal me = NULL;
2157         krb5_principal server = NULL;
2158         krb5_principal impersonate_princ = NULL;
2159         krb5_creds *creds = NULL;
2160         krb5_ccache ccache = NULL;
2161
2162         *creds_p = NULL;
2163
2164         initialize_krb5_error_table();
2165         ret = krb5_init_context(&context);
2166         if (ret) {
2167                 goto done;
2168         }
2169
2170         if (time_offset != 0) {
2171                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2172         }
2173
2174         ret = krb5_cc_resolve(context, cc ? cc :
2175                 krb5_cc_default_name(context), &ccache);
2176         if (ret) {
2177                 goto done;
2178         }
2179
2180         ret = krb5_cc_get_principal(context, ccache, &me);
2181         if (ret) {
2182                 goto done;
2183         }
2184
2185         ret = smb_krb5_parse_name(context, server_s, &server);
2186         if (ret) {
2187                 goto done;
2188         }
2189
2190         if (impersonate_princ_s) {
2191                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2192                                           &impersonate_princ);
2193                 if (ret) {
2194                         goto done;
2195                 }
2196         }
2197
2198         ret = smb_krb5_get_credentials(context, ccache,
2199                                        me, server, impersonate_princ,
2200                                        &creds);
2201         if (ret) {
2202                 goto done;
2203         }
2204
2205         ret = krb5_cc_store_cred(context, ccache, creds);
2206         if (ret) {
2207                 goto done;
2208         }
2209
2210         if (creds_p) {
2211                 *creds_p = creds;
2212         }
2213
2214         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2215                 server_s));
2216
2217         if (impersonate_princ_s) {
2218                 char *client = NULL;
2219
2220                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2221                 if (ret) {
2222                         goto done;
2223                 }
2224                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2225                         client));
2226                 TALLOC_FREE(client);
2227         }
2228
2229  done:
2230         if (!context) {
2231                 return ret;
2232         }
2233
2234         if (creds && ret) {
2235                 krb5_free_creds(context, creds);
2236         }
2237         if (server) {
2238                 krb5_free_principal(context, server);
2239         }
2240         if (me) {
2241                 krb5_free_principal(context, me);
2242         }
2243         if (impersonate_princ) {
2244                 krb5_free_principal(context, impersonate_princ);
2245         }
2246         if (ccache) {
2247                 krb5_cc_close(context, ccache);
2248         }
2249         krb5_free_context(context);
2250
2251         return ret;
2252 }
2253
2254 /*
2255  * smb_krb5_principal_get_realm
2256  *
2257  * @brief Get realm of a principal
2258  *
2259  * @param[in] context           The krb5_context
2260  * @param[in] principal         The principal
2261  * @return pointer to the realm
2262  *
2263  */
2264
2265 char *smb_krb5_principal_get_realm(krb5_context context,
2266                                    krb5_principal principal)
2267 {
2268 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2269         return krb5_principal_get_realm(context, principal);
2270 #elif defined(krb5_princ_realm) /* MIT */
2271         krb5_data *realm;
2272         realm = krb5_princ_realm(context, principal);
2273         return (char *)realm->data;
2274 #else
2275         return NULL;
2276 #endif
2277 }
2278
2279 #else /* HAVE_KRB5 */
2280  /* this saves a few linking headaches */
2281  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2282                         const char *principal, time_t time_offset,
2283                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2284                         uint32_t extra_ap_opts,
2285                         const char *ccname, time_t *tgs_expire,
2286                         const char *impersonate_princ_s)
2287 {
2288          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2289          return 1;
2290 }
2291
2292 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
2293 {
2294         DEBUG(0,("NO KERBEROS SUPPORT\n"));
2295         return false;
2296 }
2297
2298 #endif /* HAVE_KRB5 */