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)
 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 #endif
 906
 907         /* Frees and reallocates in_data into a GSS checksum blob. */
 908         retval = create_gss_checksum(&in_data, gss_flags);
 909         if (retval) {
 910                 goto cleanup_data;
 911         }
 912
 913 #if defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 914         /* We always want GSS-checksum types. */
 915         retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 916         if (retval) {
 917                 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 918                         error_message(retval)));
 919                 goto cleanup_data;
 920         }
 921 #endif
 922
 923         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 924                                       &in_data, credsp, outbuf);
 925         if (retval) {
 926                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 927                          error_message(retval)));
 928         }
 929
 930 cleanup_data:
 931         if (in_data.data) {
 932                 free( in_data.data );
 933                 in_data.length = 0;
 934         }
 935
 936         krb5_free_creds(context, credsp);
 937
 938 cleanup_creds:
 939         krb5_free_cred_contents(context, &creds);
 940
 941 cleanup_princ:
 942         krb5_free_principal(context, server);
 943         if (impersonate_princ) {
 944                 krb5_free_principal(context, impersonate_princ);
 945         }
 946
 947         return retval;
 948 }
 949
 950 /*
 951   get a kerberos5 ticket for the given service
 952 */
 953 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 954                         const char *principal, time_t time_offset,
 955                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 956                         uint32_t extra_ap_opts, const char *ccname,
 957                         time_t *tgs_expire,
 958                         const char *impersonate_princ_s)
 959
 960 {
 961         krb5_error_code retval;
 962         krb5_data packet;
 963         krb5_context context = NULL;
 964         krb5_ccache ccdef = NULL;
 965         krb5_auth_context auth_context = NULL;
 966         krb5_enctype enc_types[] = {
 967 #ifdef ENCTYPE_ARCFOUR_HMAC
 968                 ENCTYPE_ARCFOUR_HMAC,
 969 #endif
 970                 ENCTYPE_DES_CBC_MD5,
 971                 ENCTYPE_DES_CBC_CRC,
 972                 ENCTYPE_NULL};
 973
 974         initialize_krb5_error_table();
 975         retval = krb5_init_context(&context);
 976         if (retval) {
 977                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 978                          error_message(retval)));
 979                 goto failed;
 980         }
 981
 982         if (time_offset != 0) {
 983                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 984         }
 985
 986         if ((retval = krb5_cc_resolve(context, ccname ?
 987                         ccname : krb5_cc_default_name(context), &ccdef))) {
 988                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 989                          error_message(retval)));
 990                 goto failed;
 991         }
 992
 993         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 994                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 995                          error_message(retval)));
 996                 goto failed;
 997         }
 998
 999         retval = ads_krb5_mk_req(context, &auth_context,
1000                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
1001                                 principal, ccdef, &packet,
1002                                 tgs_expire, impersonate_princ_s);
1003         if (retval) {
1004                 goto failed;
1005         }
1006
1007         get_krb5_smb_session_key(mem_ctx, context, auth_context,
1008                                  session_key_krb5, false);
1009
1010         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
1011
1012         kerberos_free_data_contents(context, &packet);
1013
1014 failed:
1015
1016         if (context) {
1017                 if (ccdef)
1018                         krb5_cc_close(context, ccdef);
1019                 if (auth_context)
1020                         krb5_auth_con_free(context, auth_context);
1021                 krb5_free_context(context);
1022         }
1023
1024         return retval;
1025 }
1026
1027 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
1028                               krb5_context context,
1029                               krb5_auth_context auth_context,
1030                               DATA_BLOB *session_key, bool remote)
1031 {
1032         krb5_keyblock *skey = NULL;
1033         krb5_error_code err = 0;
1034         bool ret = false;
1035
1036         if (remote) {
1037                 err = krb5_auth_con_getremotesubkey(context,
1038                                                     auth_context, &skey);
1039         } else {
1040                 err = krb5_auth_con_getlocalsubkey(context,
1041                                                    auth_context, &skey);
1042         }
1043
1044         if (err || skey == NULL) {
1045                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1046                 goto done;
1047         }
1048
1049         DEBUG(10, ("Got KRB5 session key of length %d\n",
1050                    (int)KRB5_KEY_LENGTH(skey)));
1051
1052         *session_key = data_blob_talloc(mem_ctx,
1053                                          KRB5_KEY_DATA(skey),
1054                                          KRB5_KEY_LENGTH(skey));
1055         dump_data_pw("KRB5 Session Key:\n",
1056                      session_key->data,
1057                      session_key->length);
1058
1059         ret = true;
1060
1061 done:
1062         if (skey) {
1063                 krb5_free_keyblock(context, skey);
1064         }
1065
1066         return ret;
1067 }
1068
1069
1070 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
1071  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
1072
1073  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
1074 {
1075         static krb5_data kdata;
1076
1077         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
1078         kdata.length = strlen((const char *)kdata.data);
1079         return &kdata;
1080 }
1081 #endif
1082
1083  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
1084 {
1085 /* Try krb5_free_keytab_entry_contents first, since
1086  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1087  * krb5_kt_free_entry but only has a prototype for the first, while the
1088  * second is considered private.
1089  */
1090 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1091         return krb5_free_keytab_entry_contents(context, kt_entry);
1092 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1093         return krb5_kt_free_entry(context, kt_entry);
1094 #else
1095 #error UNKNOWN_KT_FREE_FUNCTION
1096 #endif
1097 }
1098
1099  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1100                                      struct PAC_SIGNATURE_DATA *sig)
1101 {
1102 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1103         cksum->cksumtype        = (krb5_cksumtype)sig->type;
1104         cksum->checksum.length  = sig->signature.length;
1105         cksum->checksum.data    = sig->signature.data;
1106 #else
1107         cksum->checksum_type    = (krb5_cksumtype)sig->type;
1108         cksum->length           = sig->signature.length;
1109         cksum->contents         = sig->signature.data;
1110 #endif
1111 }
1112
1113  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1114                                           const krb5_keyblock *keyblock,
1115                                          krb5_keyusage usage,
1116                                          krb5_checksum *cksum,
1117                                          uint8 *data,
1118                                          size_t length)
1119 {
1120         krb5_error_code ret;
1121
1122         /* verify the checksum */
1123
1124         /* welcome to the wonderful world of samba's kerberos abstraction layer:
1125          *
1126          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
1127          * -----------------------------------------------------------------------------
1128          * krb5_c_verify_checksum       -                       works           works
1129          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
1130          */
1131
1132 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1133         {
1134                 krb5_boolean checksum_valid = False;
1135                 krb5_data input;
1136
1137                 input.data = (char *)data;
1138                 input.length = length;
1139
1140                 ret = krb5_c_verify_checksum(context,
1141                                              keyblock,
1142                                              usage,
1143                                              &input,
1144                                              cksum,
1145                                              &checksum_valid);
1146                 if (ret) {
1147                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1148                                 error_message(ret)));
1149                         return ret;
1150                 }
1151
1152                 if (!checksum_valid)
1153                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1154         }
1155
1156 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1157
1158         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1159          * without enctype and it ignores any key_usage types - Guenther */
1160
1161         {
1162
1163                 krb5_crypto crypto;
1164                 ret = krb5_crypto_init(context,
1165                                        keyblock,
1166                                        0,
1167                                        &crypto);
1168                 if (ret) {
1169                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1170                                 error_message(ret)));
1171                         return ret;
1172                 }
1173
1174                 ret = krb5_verify_checksum(context,
1175                                            crypto,
1176                                            usage,
1177                                            data,
1178                                            length,
1179                                            cksum);
1180
1181                 krb5_crypto_destroy(context, crypto);
1182         }
1183
1184 #else
1185 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1186 #endif
1187
1188         return ret;
1189 }
1190
1191  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1192 {
1193 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1194         return tkt->enc_part2->times.authtime;
1195 #else
1196         return tkt->ticket.authtime;
1197 #endif
1198 }
1199
1200 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1201 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1202 {
1203 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1204         if (ap_req->ticket->enc_part.kvno)
1205                 return ap_req->ticket->enc_part.kvno;
1206 #else /* Heimdal */
1207         if (ap_req->ticket.enc_part.kvno)
1208                 return *ap_req->ticket.enc_part.kvno;
1209 #endif
1210         return 0;
1211 }
1212
1213 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1214 {
1215 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1216         return ap_req->ticket.enc_part.etype;
1217 #else /* MIT */
1218         return ap_req->ticket->enc_part.enctype;
1219 #endif
1220 }
1221 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1222
1223 static krb5_error_code
1224 get_key_from_keytab(krb5_context context,
1225                     krb5_const_principal server,
1226                     krb5_enctype enctype,
1227                     krb5_kvno kvno,
1228                     krb5_keyblock **out_key)
1229 {
1230         krb5_keytab_entry entry;
1231         krb5_error_code ret;
1232         krb5_keytab keytab;
1233         char *name = NULL;
1234         krb5_keyblock *keyp;
1235
1236         /* We have to open a new keytab handle here, as MIT does
1237            an implicit open/getnext/close on krb5_kt_get_entry. We
1238            may be in the middle of a keytab enumeration when this is
1239            called. JRA. */
1240
1241         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1242         if (ret) {
1243                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1244                 return ret;
1245         }
1246
1247         if ( DEBUGLEVEL >= 10 ) {
1248                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1249                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1250                                 kvno, enctype, name));
1251                         TALLOC_FREE(name);
1252                 }
1253         }
1254
1255         ret = krb5_kt_get_entry(context,
1256                                 keytab,
1257                                 server,
1258                                 kvno,
1259                                 enctype,
1260                                 &entry);
1261
1262         if (ret) {
1263                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1264                 goto out;
1265         }
1266
1267         keyp = KRB5_KT_KEY(&entry);
1268
1269         ret = krb5_copy_keyblock(context, keyp, out_key);
1270         if (ret) {
1271                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1272                 goto out;
1273         }
1274
1275         smb_krb5_kt_free_entry(context, &entry);
1276
1277 out:
1278         krb5_kt_close(context, keytab);
1279         return ret;
1280 }
1281
1282 /* Prototypes */
1283
1284  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1285                                                  const krb5_data *inbuf,
1286                                                  krb5_kvno *kvno,
1287                                                  krb5_enctype *enctype)
1288 {
1289 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1290         {
1291                 krb5_error_code ret;
1292                 krb5_ap_req ap_req;
1293
1294                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1295                 if (ret)
1296                         return ret;
1297
1298                 *kvno = get_kvno_from_ap_req(&ap_req);
1299                 *enctype = get_enctype_from_ap_req(&ap_req);
1300
1301                 free_AP_REQ(&ap_req);
1302                 return 0;
1303         }
1304 #endif
1305
1306         /* Possibly not an appropriate error code. */
1307         return KRB5KDC_ERR_BADOPTION;
1308 }
1309
1310  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1311                                                         krb5_auth_context *auth_context,
1312                                                         const krb5_data *inbuf,
1313                                                         krb5_const_principal server,
1314                                                         krb5_keytab keytab,
1315                                                         krb5_flags *ap_req_options,
1316                                                         krb5_ticket **ticket,
1317                                                         krb5_keyblock **keyblock)
1318 {
1319         krb5_error_code ret;
1320         krb5_kvno kvno;
1321         krb5_enctype enctype;
1322         krb5_keyblock *local_keyblock;
1323
1324         ret = krb5_rd_req(context,
1325                           auth_context,
1326                           inbuf,
1327                           server,
1328                           keytab,
1329                           ap_req_options,
1330                           ticket);
1331         if (ret) {
1332                 return ret;
1333         }
1334
1335 #ifdef KRB5_TICKET_HAS_KEYINFO
1336         enctype = (*ticket)->enc_part.enctype;
1337         kvno = (*ticket)->enc_part.kvno;
1338 #else
1339         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1340         if (ret) {
1341                 return ret;
1342         }
1343 #endif
1344
1345         ret = get_key_from_keytab(context,
1346                                   server,
1347                                   enctype,
1348                                   kvno,
1349                                   &local_keyblock);
1350         if (ret) {
1351                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1352                 goto out;
1353         }
1354
1355 out:
1356         if (ret && local_keyblock != NULL) {
1357                 krb5_free_keyblock(context, local_keyblock);
1358         } else {
1359                 *keyblock = local_keyblock;
1360         }
1361
1362         return ret;
1363 }
1364
1365  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1366                                             const char *name,
1367                                             krb5_principal *principal)
1368 {
1369 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1370         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1371 #endif
1372
1373         /* we are cheating here because parse_name will in fact set the realm.
1374          * We don't care as the only caller of smb_krb5_parse_name_norealm
1375          * ignores the realm anyway when calling
1376          * smb_krb5_principal_compare_any_realm later - Guenther */
1377
1378         return smb_krb5_parse_name(context, name, principal);
1379 }
1380
1381  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1382                                           krb5_const_principal princ1,
1383                                           krb5_const_principal princ2)
1384 {
1385 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1386
1387         return krb5_principal_compare_any_realm(context, princ1, princ2);
1388
1389 /* krb5_princ_size is a macro in MIT */
1390 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1391
1392         int i, len1, len2;
1393         const krb5_data *p1, *p2;
1394
1395         len1 = krb5_princ_size(context, princ1);
1396         len2 = krb5_princ_size(context, princ2);
1397
1398         if (len1 != len2)
1399                 return False;
1400
1401         for (i = 0; i < len1; i++) {
1402
1403                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1404                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1405
1406                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1407                         return False;
1408         }
1409
1410         return True;
1411 #else
1412 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1413 #endif
1414 }
1415
1416  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1417                                        const char *client_string,       /* gd@BER.SUSE.DE */
1418                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1419                                        time_t *expire_time)
1420 {
1421         krb5_error_code ret;
1422         krb5_context context = NULL;
1423         krb5_ccache ccache = NULL;
1424         krb5_principal client = NULL;
1425         krb5_creds creds, creds_in, *creds_out = NULL;
1426
1427         ZERO_STRUCT(creds);
1428         ZERO_STRUCT(creds_in);
1429
1430         initialize_krb5_error_table();
1431         ret = krb5_init_context(&context);
1432         if (ret) {
1433                 goto done;
1434         }
1435
1436         if (!ccache_string) {
1437                 ccache_string = krb5_cc_default_name(context);
1438         }
1439
1440         if (!ccache_string) {
1441                 ret = EINVAL;
1442                 goto done;
1443         }
1444
1445         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1446
1447         /* FIXME: we should not fall back to defaults */
1448         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1449         if (ret) {
1450                 goto done;
1451         }
1452
1453         if (client_string) {
1454                 ret = smb_krb5_parse_name(context, client_string, &client);
1455                 if (ret) {
1456                         goto done;
1457                 }
1458         } else {
1459                 ret = krb5_cc_get_principal(context, ccache, &client);
1460                 if (ret) {
1461                         goto done;
1462                 }
1463         }
1464
1465 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1466         {
1467                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1468                 if (ret) {
1469                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1470                         goto done;
1471                 }
1472         }
1473 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1474         {
1475                 krb5_kdc_flags flags;
1476                 krb5_realm *client_realm = NULL;
1477
1478                 ret = krb5_copy_principal(context, client, &creds_in.client);
1479                 if (ret) {
1480                         goto done;
1481                 }
1482
1483                 if (service_string) {
1484                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1485                         if (ret) {
1486                                 goto done;
1487                         }
1488                 } else {
1489                         /* build tgt service by default */
1490                         client_realm = krb5_princ_realm(context, creds_in.client);
1491                         if (!client_realm) {
1492                                 ret = ENOMEM;
1493                                 goto done;
1494                         }
1495                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1496                         if (ret) {
1497                                 goto done;
1498                         }
1499                 }
1500
1501                 flags.i = 0;
1502                 flags.b.renewable = flags.b.renew = True;
1503
1504                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1505                 if (ret) {
1506                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1507                         goto done;
1508                 }
1509
1510                 creds = *creds_out;
1511         }
1512 #else
1513 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1514 #endif
1515
1516         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1517         ret = krb5_cc_initialize(context, ccache, client);
1518         if (ret) {
1519                 goto done;
1520         }
1521
1522         ret = krb5_cc_store_cred(context, ccache, &creds);
1523
1524         if (expire_time) {
1525                 *expire_time = (time_t) creds.times.endtime;
1526         }
1527
1528 done:
1529         krb5_free_cred_contents(context, &creds_in);
1530
1531         if (creds_out) {
1532                 krb5_free_creds(context, creds_out);
1533         } else {
1534                 krb5_free_cred_contents(context, &creds);
1535         }
1536
1537         if (client) {
1538                 krb5_free_principal(context, client);
1539         }
1540         if (ccache) {
1541                 krb5_cc_close(context, ccache);
1542         }
1543         if (context) {
1544                 krb5_free_context(context);
1545         }
1546
1547         return ret;
1548 }
1549
1550  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1551 {
1552         krb5_error_code ret = 0;
1553         if (addr == NULL) {
1554                 return ret;
1555         }
1556 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1557         krb5_free_addresses(context, addr->addrs);
1558 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1559         ret = krb5_free_addresses(context, addr->addrs);
1560         SAFE_FREE(addr->addrs);
1561 #endif
1562         SAFE_FREE(addr);
1563         addr = NULL;
1564         return ret;
1565 }
1566
1567  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1568 {
1569         krb5_error_code ret = 0;
1570         nstring buf;
1571 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1572         krb5_address **addrs = NULL;
1573 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1574         krb5_addresses *addrs = NULL;
1575 #endif
1576
1577         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1578         if (*kerb_addr == NULL) {
1579                 return ENOMEM;
1580         }
1581
1582         put_name(buf, global_myname(), ' ', 0x20);
1583
1584 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1585         {
1586                 int num_addr = 2;
1587
1588                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1589                 if (addrs == NULL) {
1590                         SAFE_FREE(*kerb_addr);
1591                         return ENOMEM;
1592                 }
1593
1594                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1595
1596                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1597                 if (addrs[0] == NULL) {
1598                         SAFE_FREE(addrs);
1599                         SAFE_FREE(*kerb_addr);
1600                         return ENOMEM;
1601                 }
1602
1603                 addrs[0]->magic = KV5M_ADDRESS;
1604                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1605                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1606                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1607                 if (addrs[0]->contents == NULL) {
1608                         SAFE_FREE(addrs[0]);
1609                         SAFE_FREE(addrs);
1610                         SAFE_FREE(*kerb_addr);
1611                         return ENOMEM;
1612                 }
1613
1614                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1615
1616                 addrs[1] = NULL;
1617         }
1618 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1619         {
1620                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1621                 if (addrs == NULL) {
1622                         SAFE_FREE(*kerb_addr);
1623                         return ENOMEM;
1624                 }
1625
1626                 memset(addrs, 0, sizeof(krb5_addresses));
1627
1628                 addrs->len = 1;
1629                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1630                 if (addrs->val == NULL) {
1631                         SAFE_FREE(addrs);
1632                         SAFE_FREE(kerb_addr);
1633                         return ENOMEM;
1634                 }
1635
1636                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1637                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1638                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1639                 if (addrs->val[0].address.data == NULL) {
1640                         SAFE_FREE(addrs->val);
1641                         SAFE_FREE(addrs);
1642                         SAFE_FREE(*kerb_addr);
1643                         return ENOMEM;
1644                 }
1645
1646                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1647         }
1648 #else
1649 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1650 #endif
1651         (*kerb_addr)->addrs = addrs;
1652
1653         return ret;
1654 }
1655
1656  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1657 {
1658 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1659         krb5_free_error_contents(context, krberror);
1660 #else /* MIT */
1661         krb5_free_error(context, krberror);
1662 #endif
1663 }
1664
1665  krb5_error_code handle_krberror_packet(krb5_context context,
1666                                         krb5_data *packet)
1667 {
1668         krb5_error_code ret;
1669         bool got_error_code = False;
1670
1671         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1672
1673 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1674         {
1675                 krb5_error krberror;
1676
1677                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1678                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1679                                 error_message(ret)));
1680                         return ret;
1681                 }
1682
1683                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1684                         ret = (krb5_error_code) krberror.error_code;
1685                         got_error_code = True;
1686                 }
1687
1688                 smb_krb5_free_error(context, &krberror);
1689         }
1690 #else /* MIT */
1691         {
1692                 krb5_error *krberror;
1693
1694                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1695                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1696                                 error_message(ret)));
1697                         return ret;
1698                 }
1699
1700                 if (krberror->e_data.data == NULL) {
1701 #if defined(ERROR_TABLE_BASE_krb5)
1702                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1703 #else
1704                         ret = (krb5_error_code)krberror->error;
1705 #endif
1706                         got_error_code = True;
1707                 }
1708                 smb_krb5_free_error(context, krberror);
1709         }
1710 #endif
1711         if (got_error_code) {
1712                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1713                         error_message(ret), ret));
1714         }
1715         return ret;
1716 }
1717
1718  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1719                                             krb5_get_init_creds_opt **opt)
1720 {
1721 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1722         /* Heimdal or modern MIT version */
1723         return krb5_get_init_creds_opt_alloc(context, opt);
1724 #else
1725         /* Historical MIT version */
1726         krb5_get_init_creds_opt *my_opt;
1727
1728         *opt = NULL;
1729
1730         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1731                 return ENOMEM;
1732         }
1733
1734         krb5_get_init_creds_opt_init(my_opt);
1735
1736         *opt =  my_opt;
1737         return 0;
1738 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1739 }
1740
1741  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1742                                 krb5_get_init_creds_opt *opt)
1743 {
1744 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1745
1746 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1747         /* Modern MIT or Heimdal version */
1748         krb5_get_init_creds_opt_free(context, opt);
1749 #else
1750         /* Heimdal version */
1751         krb5_get_init_creds_opt_free(opt);
1752 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1753
1754 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1755         /* Historical MIT version */
1756         SAFE_FREE(opt);
1757         opt = NULL;
1758 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1759 }
1760
1761  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1762 {
1763         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1764 }
1765
1766
1767 /* caller needs to free etype_s */
1768  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1769                                             krb5_enctype enctype,
1770                                             char **etype_s)
1771 {
1772 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1773         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1774 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1775         char buf[256];
1776         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1777         if (ret) {
1778                 return ret;
1779         }
1780         *etype_s = SMB_STRDUP(buf);
1781         if (!*etype_s) {
1782                 return ENOMEM;
1783         }
1784         return ret;
1785 #else
1786 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1787 #endif
1788 }
1789
1790  krb5_error_code smb_krb5_mk_error(krb5_context context,
1791                                 krb5_error_code error_code,
1792                                 const krb5_principal server,
1793                                 krb5_data *reply)
1794 {
1795 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1796         /*
1797          * The MIT interface is *terrible*.
1798          * We have to construct this ourselves...
1799          */
1800         krb5_error e;
1801
1802         memset(&e, 0, sizeof(e));
1803         krb5_us_timeofday(context, &e.stime, &e.susec);
1804         e.server = server;
1805 #if defined(krb5_err_base)
1806         e.error = error_code - krb5_err_base;
1807 #elif defined(ERROR_TABLE_BASE_krb5)
1808         e.error = error_code - ERROR_TABLE_BASE_krb5;
1809 #else
1810         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1811 #endif
1812
1813         return krb5_mk_error(context, &e, reply);
1814 #else /* Heimdal. */
1815         return krb5_mk_error(context,
1816                                 error_code,
1817                                 NULL,
1818                                 NULL, /* e_data */
1819                                 NULL,
1820                                 server,
1821                                 NULL,
1822                                 NULL,
1823                                 reply);
1824 #endif
1825 }
1826
1827 /**********************************************************************
1828  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1829  * allows to process non-default keytab names.
1830  * @param context krb5_context
1831  * @param keytab_name_req string
1832  * @param write_access bool if writable keytab is required
1833  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1834  * @return krb5_error_code
1835 **********************************************************************/
1836
1837 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1838 #ifndef MAX_KEYTAB_NAME_LEN
1839 #define MAX_KEYTAB_NAME_LEN 1100
1840 #endif
1841
1842  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1843                                       const char *keytab_name_req,
1844                                       bool write_access,
1845                                       krb5_keytab *keytab)
1846 {
1847         krb5_error_code ret = 0;
1848         TALLOC_CTX *mem_ctx;
1849         char keytab_string[MAX_KEYTAB_NAME_LEN];
1850         char *kt_str = NULL;
1851         bool found_valid_name = False;
1852         const char *pragma = "FILE";
1853         const char *tmp = NULL;
1854
1855         if (!write_access && !keytab_name_req) {
1856                 /* caller just wants to read the default keytab readonly, so be it */
1857                 return krb5_kt_default(context, keytab);
1858         }
1859
1860         mem_ctx = talloc_init("smb_krb5_open_keytab");
1861         if (!mem_ctx) {
1862                 return ENOMEM;
1863         }
1864
1865 #ifdef HAVE_WRFILE_KEYTAB
1866         if (write_access) {
1867                 pragma = "WRFILE";
1868         }
1869 #endif
1870
1871         if (keytab_name_req) {
1872
1873                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1874                         ret = KRB5_CONFIG_NOTENUFSPACE;
1875                         goto out;
1876                 }
1877
1878                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1879                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1880                         tmp = keytab_name_req;
1881                         goto resolve;
1882                 }
1883
1884                 if (keytab_name_req[0] != '/') {
1885                         ret = KRB5_KT_BADNAME;
1886                         goto out;
1887                 }
1888
1889                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1890                 if (!tmp) {
1891                         ret = ENOMEM;
1892                         goto out;
1893                 }
1894
1895                 goto resolve;
1896         }
1897
1898         /* we need to handle more complex keytab_strings, like:
1899          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1900
1901         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1902         if (ret) {
1903                 goto out;
1904         }
1905
1906         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1907
1908         tmp = talloc_strdup(mem_ctx, keytab_string);
1909         if (!tmp) {
1910                 ret = ENOMEM;
1911                 goto out;
1912         }
1913
1914         if (strncmp(tmp, "ANY:", 4) == 0) {
1915                 tmp += 4;
1916         }
1917
1918         memset(&keytab_string, '\0', sizeof(keytab_string));
1919
1920         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1921                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1922                         found_valid_name = True;
1923                         tmp = kt_str;
1924                         tmp += 7;
1925                 }
1926
1927                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1928                         found_valid_name = True;
1929                         tmp = kt_str;
1930                         tmp += 5;
1931                 }
1932
1933                 if (tmp[0] == '/') {
1934                         /* Treat as a FILE: keytab definition. */
1935                         found_valid_name = true;
1936                 }
1937
1938                 if (found_valid_name) {
1939                         if (tmp[0] != '/') {
1940                                 ret = KRB5_KT_BADNAME;
1941                                 goto out;
1942                         }
1943
1944                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1945                         if (!tmp) {
1946                                 ret = ENOMEM;
1947                                 goto out;
1948                         }
1949                         break;
1950                 }
1951         }
1952
1953         if (!found_valid_name) {
1954                 ret = KRB5_KT_UNKNOWN_TYPE;
1955                 goto out;
1956         }
1957
1958  resolve:
1959         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1960         ret = krb5_kt_resolve(context, tmp, keytab);
1961
1962  out:
1963         TALLOC_FREE(mem_ctx);
1964         return ret;
1965 }
1966
1967 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1968                                      krb5_context context,
1969                                      krb5_keytab keytab,
1970                                      const char **keytab_name)
1971 {
1972         char keytab_string[MAX_KEYTAB_NAME_LEN];
1973         krb5_error_code ret = 0;
1974
1975         ret = krb5_kt_get_name(context, keytab,
1976                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1977         if (ret) {
1978                 return ret;
1979         }
1980
1981         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1982         if (!*keytab_name) {
1983                 return ENOMEM;
1984         }
1985
1986         return ret;
1987 }
1988
1989 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1990     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1991     defined(HAVE_KRB5_GET_CREDS)
1992 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1993                                                              krb5_ccache ccache,
1994                                                              krb5_principal me,
1995                                                              krb5_principal server,
1996                                                              krb5_principal impersonate_princ,
1997                                                              krb5_creds **out_creds)
1998 {
1999         krb5_error_code ret;
2000         krb5_get_creds_opt opt;
2001
2002         ret = krb5_get_creds_opt_alloc(context, &opt);
2003         if (ret) {
2004                 goto done;
2005         }
2006         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
2007
2008         if (impersonate_princ) {
2009                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
2010                                                          impersonate_princ);
2011                 if (ret) {
2012                         goto done;
2013                 }
2014         }
2015
2016         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2017         if (ret) {
2018                 goto done;
2019         }
2020
2021  done:
2022         if (opt) {
2023                 krb5_get_creds_opt_free(context, opt);
2024         }
2025         return ret;
2026 }
2027 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2028
2029 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2030 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2031                                                          krb5_ccache ccache,
2032                                                          krb5_principal me,
2033                                                          krb5_principal server,
2034                                                          krb5_principal impersonate_princ,
2035                                                          krb5_creds **out_creds)
2036 {
2037         krb5_error_code ret;
2038         krb5_creds in_creds;
2039
2040 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2041 krb5_error_code KRB5_CALLCONV
2042 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2043                               krb5_ccache ccache, krb5_creds *in_creds,
2044                               krb5_data *subject_cert,
2045                               krb5_creds **out_creds);
2046 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2047
2048         ZERO_STRUCT(in_creds);
2049
2050         if (impersonate_princ) {
2051
2052                 in_creds.server = me;
2053                 in_creds.client = impersonate_princ;
2054
2055                 ret = krb5_get_credentials_for_user(context,
2056                                                     0, /* krb5_flags options */
2057                                                     ccache,
2058                                                     &in_creds,
2059                                                     NULL, /* krb5_data *subject_cert */
2060                                                     out_creds);
2061         } else {
2062                 in_creds.client = me;
2063                 in_creds.server = server;
2064
2065                 ret = krb5_get_credentials(context, 0, ccache,
2066                                            &in_creds, out_creds);
2067         }
2068
2069         return ret;
2070 }
2071 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2072
2073 /*
2074  * smb_krb5_get_credentials
2075  *
2076  * @brief Get krb5 credentials for a server
2077  *
2078  * @param[in] context           An initialized krb5_context
2079  * @param[in] ccache            An initialized krb5_ccache
2080  * @param[in] me                The krb5_principal of the caller
2081  * @param[in] server            The krb5_principal of the requested service
2082  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2083  * @param[out] out_creds        The returned krb5_creds structure
2084  * @return krb5_error_code
2085  *
2086  */
2087 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2088                                          krb5_ccache ccache,
2089                                          krb5_principal me,
2090                                          krb5_principal server,
2091                                          krb5_principal impersonate_princ,
2092                                          krb5_creds **out_creds)
2093 {
2094         krb5_error_code ret;
2095         krb5_creds *creds = NULL;
2096
2097         *out_creds = NULL;
2098
2099         if (impersonate_princ) {
2100 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2101                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2102 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2103                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2104 #else
2105                 ret = ENOTSUP;
2106 #endif
2107         } else {
2108                 krb5_creds in_creds;
2109
2110                 ZERO_STRUCT(in_creds);
2111
2112                 in_creds.client = me;
2113                 in_creds.server = server;
2114
2115                 ret = krb5_get_credentials(context, 0, ccache,
2116                                            &in_creds, &creds);
2117         }
2118         if (ret) {
2119                 goto done;
2120         }
2121
2122         ret = krb5_cc_store_cred(context, ccache, creds);
2123         if (ret) {
2124                 goto done;
2125         }
2126
2127         if (out_creds) {
2128                 *out_creds = creds;
2129         }
2130
2131  done:
2132         if (creds && ret) {
2133                 krb5_free_creds(context, creds);
2134         }
2135
2136         return ret;
2137 }
2138
2139 /*
2140  * smb_krb5_get_creds
2141  *
2142  * @brief Get krb5 credentials for a server
2143  *
2144  * @param[in] server_s          The string name of the service
2145  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2146  * @param[in] cc                The krb5 credential cache string name (optional)
2147  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2148  * @param[out] creds_p          The returned krb5_creds structure
2149  * @return krb5_error_code
2150  *
2151  */
2152 krb5_error_code smb_krb5_get_creds(const char *server_s,
2153                                    time_t time_offset,
2154                                    const char *cc,
2155                                    const char *impersonate_princ_s,
2156                                    krb5_creds **creds_p)
2157 {
2158         krb5_error_code ret;
2159         krb5_context context = NULL;
2160         krb5_principal me = NULL;
2161         krb5_principal server = NULL;
2162         krb5_principal impersonate_princ = NULL;
2163         krb5_creds *creds = NULL;
2164         krb5_ccache ccache = NULL;
2165
2166         *creds_p = NULL;
2167
2168         initialize_krb5_error_table();
2169         ret = krb5_init_context(&context);
2170         if (ret) {
2171                 goto done;
2172         }
2173
2174         if (time_offset != 0) {
2175                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2176         }
2177
2178         ret = krb5_cc_resolve(context, cc ? cc :
2179                 krb5_cc_default_name(context), &ccache);
2180         if (ret) {
2181                 goto done;
2182         }
2183
2184         ret = krb5_cc_get_principal(context, ccache, &me);
2185         if (ret) {
2186                 goto done;
2187         }
2188
2189         ret = smb_krb5_parse_name(context, server_s, &server);
2190         if (ret) {
2191                 goto done;
2192         }
2193
2194         if (impersonate_princ_s) {
2195                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2196                                           &impersonate_princ);
2197                 if (ret) {
2198                         goto done;
2199                 }
2200         }
2201
2202         ret = smb_krb5_get_credentials(context, ccache,
2203                                        me, server, impersonate_princ,
2204                                        &creds);
2205         if (ret) {
2206                 goto done;
2207         }
2208
2209         ret = krb5_cc_store_cred(context, ccache, creds);
2210         if (ret) {
2211                 goto done;
2212         }
2213
2214         if (creds_p) {
2215                 *creds_p = creds;
2216         }
2217
2218         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2219                 server_s));
2220
2221         if (impersonate_princ_s) {
2222                 char *client = NULL;
2223
2224                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2225                 if (ret) {
2226                         goto done;
2227                 }
2228                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2229                         client));
2230                 TALLOC_FREE(client);
2231         }
2232
2233  done:
2234         if (!context) {
2235                 return ret;
2236         }
2237
2238         if (creds && ret) {
2239                 krb5_free_creds(context, creds);
2240         }
2241         if (server) {
2242                 krb5_free_principal(context, server);
2243         }
2244         if (me) {
2245                 krb5_free_principal(context, me);
2246         }
2247         if (impersonate_princ) {
2248                 krb5_free_principal(context, impersonate_princ);
2249         }
2250         if (ccache) {
2251                 krb5_cc_close(context, ccache);
2252         }
2253         krb5_free_context(context);
2254
2255         return ret;
2256 }
2257
2258 /*
2259  * smb_krb5_principal_get_realm
2260  *
2261  * @brief Get realm of a principal
2262  *
2263  * @param[in] context           The krb5_context
2264  * @param[in] principal         The principal
2265  * @return pointer to the realm
2266  *
2267  */
2268
2269 char *smb_krb5_principal_get_realm(krb5_context context,
2270                                    krb5_principal principal)
2271 {
2272 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2273         return krb5_principal_get_realm(context, principal);
2274 #elif defined(krb5_princ_realm) /* MIT */
2275         krb5_data *realm;
2276         realm = krb5_princ_realm(context, principal);
2277         return (char *)realm->data;
2278 #else
2279         return NULL;
2280 #endif
2281 }
2282
2283 #else /* HAVE_KRB5 */
2284  /* this saves a few linking headaches */
2285  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2286                         const char *principal, time_t time_offset,
2287                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2288                         uint32_t extra_ap_opts,
2289                         const char *ccname, time_t *tgs_expire,
2290                         const char *impersonate_princ_s)
2291 {
2292          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2293          return 1;
2294 }
2295
2296 #endif