source3/libsmb/clikrb5.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    simple kerberos5 routines for active directory
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Luke Howard 2002-2003
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   7    Copyright (C) Guenther Deschner 2005-2009
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "smb_krb5.h"
  25
  26 #ifndef KRB5_AUTHDATA_WIN2K_PAC
  27 #define KRB5_AUTHDATA_WIN2K_PAC 128
  28 #endif
  29
  30 #ifndef KRB5_AUTHDATA_IF_RELEVANT
  31 #define KRB5_AUTHDATA_IF_RELEVANT 1
  32 #endif
  33
  34 #ifdef HAVE_KRB5
  35
  36 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  37 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  38 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
  39                                                         bind field, flags field. */
  40
  41 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
  42    but still has the symbol */
  43 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
  44 krb5_error_code krb5_auth_con_set_req_cksumtype(
  45         krb5_context     context,
  46         krb5_auth_context      auth_context,
  47         krb5_cksumtype     cksumtype);
  48 #endif
  49
  50 /**************************************************************
  51  Wrappers around kerberos string functions that convert from
  52  utf8 -> unix charset and vica versa.
  53 **************************************************************/
  54
  55 /**************************************************************
  56  krb5_parse_name that takes a UNIX charset.
  57 **************************************************************/
  58
  59  krb5_error_code smb_krb5_parse_name(krb5_context context,
  60                                 const char *name, /* in unix charset */
  61                                 krb5_principal *principal)
  62 {
  63         krb5_error_code ret;
  64         char *utf8_name;
  65         size_t converted_size;
  66
  67         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  68                 return ENOMEM;
  69         }
  70
  71         ret = krb5_parse_name(context, utf8_name, principal);
  72         TALLOC_FREE(utf8_name);
  73         return ret;
  74 }
  75
  76 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
  77 /**************************************************************
  78  krb5_parse_name_norealm that takes a UNIX charset.
  79 **************************************************************/
  80
  81 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
  82                                 const char *name, /* in unix charset */
  83                                 krb5_principal *principal)
  84 {
  85         krb5_error_code ret;
  86         char *utf8_name;
  87         size_t converted_size;
  88
  89         *principal = NULL;
  90         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  91                 return ENOMEM;
  92         }
  93
  94         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  95         TALLOC_FREE(utf8_name);
  96         return ret;
  97 }
  98 #endif
  99
 100 /**************************************************************
 101  krb5_parse_name that returns a UNIX charset name. Must
 102  be freed with talloc_free() call.
 103 **************************************************************/
 104
 105 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 106                                       krb5_context context,
 107                                       krb5_const_principal principal,
 108                                       char **unix_name)
 109 {
 110         krb5_error_code ret;
 111         char *utf8_name;
 112         size_t converted_size;
 113
 114         *unix_name = NULL;
 115         ret = krb5_unparse_name(context, principal, &utf8_name);
 116         if (ret) {
 117                 return ret;
 118         }
 119
 120         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 121                 krb5_free_unparsed_name(context, utf8_name);
 122                 return ENOMEM;
 123         }
 124         krb5_free_unparsed_name(context, utf8_name);
 125         return 0;
 126 }
 127
 128 #ifndef HAVE_KRB5_SET_REAL_TIME
 129 /*
 130  * This function is not in the Heimdal mainline.
 131  */
 132  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 133 {
 134         krb5_error_code ret;
 135         int32_t sec, usec;
 136
 137         ret = krb5_us_timeofday(context, &sec, &usec);
 138         if (ret)
 139                 return ret;
 140
 141         context->kdc_sec_offset = seconds - sec;
 142         context->kdc_usec_offset = microseconds - usec;
 143
 144         return 0;
 145 }
 146 #endif
 147
 148 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 149
 150 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 151
 152 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 153  * to krb5_set_default_tgs_ktypes. See
 154  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 155  *
 156  * If the MIT libraries are not exporting internal symbols, we will end up in
 157  * this branch, which is correct. Otherwise we will continue to use the
 158  * internal symbol
 159  */
 160  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 161 {
 162     return krb5_set_default_tgs_enctypes(ctx, enc);
 163 }
 164
 165 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 166
 167 /* Heimdal */
 168  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 169 {
 170         return krb5_set_default_in_tkt_etypes(ctx, enc);
 171 }
 172
 173 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 174
 175 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 176
 177 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 178 /* HEIMDAL */
 179  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 180 {
 181         memset(pkaddr, '\0', sizeof(krb5_address));
 182 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 183         if (paddr->ss_family == AF_INET6) {
 184                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 185                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 186                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 187                 return true;
 188         }
 189 #endif
 190         if (paddr->ss_family == AF_INET) {
 191                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 192                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 193                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 194                 return true;
 195         }
 196         return false;
 197 }
 198 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 199 /* MIT */
 200  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 201 {
 202         memset(pkaddr, '\0', sizeof(krb5_address));
 203 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 204         if (paddr->ss_family == AF_INET6) {
 205                 pkaddr->addrtype = ADDRTYPE_INET6;
 206                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 207                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 208                 return true;
 209         }
 210 #endif
 211         if (paddr->ss_family == AF_INET) {
 212                 pkaddr->addrtype = ADDRTYPE_INET;
 213                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 214                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 215                 return true;
 216         }
 217         return false;
 218 }
 219 #else
 220 #error UNKNOWN_ADDRTYPE
 221 #endif
 222
 223 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 224 static int create_kerberos_key_from_string_direct(krb5_context context,
 225                                                   krb5_principal host_princ,
 226                                                   krb5_data *password,
 227                                                   krb5_keyblock *key,
 228                                                   krb5_enctype enctype)
 229 {
 230         int ret = 0;
 231         krb5_data salt;
 232         krb5_encrypt_block eblock;
 233
 234         ret = krb5_principal2salt(context, host_princ, &salt);
 235         if (ret) {
 236                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 237                 return ret;
 238         }
 239         krb5_use_enctype(context, &eblock, enctype);
 240         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 241         SAFE_FREE(salt.data);
 242
 243         return ret;
 244 }
 245 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 246 static int create_kerberos_key_from_string_direct(krb5_context context,
 247                                                   krb5_principal host_princ,
 248                                                   krb5_data *password,
 249                                                   krb5_keyblock *key,
 250                                                   krb5_enctype enctype)
 251 {
 252         int ret;
 253         krb5_salt salt;
 254
 255         ret = krb5_get_pw_salt(context, host_princ, &salt);
 256         if (ret) {
 257                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 258                 return ret;
 259         }
 260
 261         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 262         krb5_free_salt(context, salt);
 263
 264         return ret;
 265 }
 266 #else
 267 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 268 #endif
 269
 270  int create_kerberos_key_from_string(krb5_context context,
 271                                         krb5_principal host_princ,
 272                                         krb5_data *password,
 273                                         krb5_keyblock *key,
 274                                         krb5_enctype enctype,
 275                                         bool no_salt)
 276 {
 277         krb5_principal salt_princ = NULL;
 278         int ret;
 279         /*
 280          * Check if we've determined that the KDC is salting keys for this
 281          * principal/enctype in a non-obvious way.  If it is, try to match
 282          * its behavior.
 283          */
 284         if (no_salt) {
 285                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 286                 if (!KRB5_KEY_DATA(key)) {
 287                         return ENOMEM;
 288                 }
 289                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 290                 KRB5_KEY_LENGTH(key) = password->length;
 291                 KRB5_KEY_TYPE(key) = enctype;
 292                 return 0;
 293         }
 294         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 295         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 296         if (salt_princ) {
 297                 krb5_free_principal(context, salt_princ);
 298         }
 299         return ret;
 300 }
 301
 302 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 303  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 304                                             krb5_enctype **enctypes)
 305 {
 306         return krb5_get_permitted_enctypes(context, enctypes);
 307 }
 308 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 309  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 310                                             krb5_enctype **enctypes)
 311 {
 312         return krb5_get_default_in_tkt_etypes(context, enctypes);
 313 }
 314 #else
 315 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 316 #endif
 317
 318 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 319  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 320                                         krb5_auth_context auth_context,
 321                                         krb5_keyblock *keyblock)
 322 {
 323         return krb5_auth_con_setkey(context, auth_context, keyblock);
 324 }
 325 #endif
 326
 327 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 328                            DATA_BLOB *edata,
 329                            DATA_BLOB *edata_out)
 330 {
 331         DATA_BLOB edata_contents;
 332         ASN1_DATA *data;
 333         int edata_type;
 334
 335         if (!edata->length) {
 336                 return False;
 337         }
 338
 339         data = asn1_init(mem_ctx);
 340         if (data == NULL) {
 341                 return false;
 342         }
 343
 344         asn1_load(data, *edata);
 345         asn1_start_tag(data, ASN1_SEQUENCE(0));
 346         asn1_start_tag(data, ASN1_CONTEXT(1));
 347         asn1_read_Integer(data, &edata_type);
 348
 349         if (edata_type != KRB5_PADATA_PW_SALT) {
 350                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 351                         KRB5_PADATA_PW_SALT, edata_type));
 352                 asn1_free(data);
 353                 return False;
 354         }
 355
 356         asn1_start_tag(data, ASN1_CONTEXT(2));
 357         asn1_read_OctetString(data, talloc_autofree_context(), &edata_contents);
 358         asn1_end_tag(data);
 359         asn1_end_tag(data);
 360         asn1_end_tag(data);
 361         asn1_free(data);
 362
 363         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 364
 365         data_blob_free(&edata_contents);
 366
 367         return True;
 368 }
 369
 370
 371 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 372 {
 373         DATA_BLOB pac_contents;
 374         ASN1_DATA *data;
 375         int data_type;
 376
 377         if (!auth_data->length) {
 378                 return False;
 379         }
 380
 381         data = asn1_init(mem_ctx);
 382         if (data == NULL) {
 383                 return false;
 384         }
 385
 386         asn1_load(data, *auth_data);
 387         asn1_start_tag(data, ASN1_SEQUENCE(0));
 388         asn1_start_tag(data, ASN1_SEQUENCE(0));
 389         asn1_start_tag(data, ASN1_CONTEXT(0));
 390         asn1_read_Integer(data, &data_type);
 391
 392         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 393                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 394                 asn1_free(data);
 395                 return False;
 396         }
 397
 398         asn1_end_tag(data);
 399         asn1_start_tag(data, ASN1_CONTEXT(1));
 400         asn1_read_OctetString(data, talloc_autofree_context(), &pac_contents);
 401         asn1_end_tag(data);
 402         asn1_end_tag(data);
 403         asn1_end_tag(data);
 404         asn1_free(data);
 405
 406         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 407
 408         data_blob_free(&pac_contents);
 409
 410         return True;
 411 }
 412
 413  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 414 {
 415         DATA_BLOB auth_data_wrapped;
 416         bool got_auth_data_pac = False;
 417         int i;
 418
 419 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 420         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 421             tkt->enc_part2->authorization_data[0] &&
 422             tkt->enc_part2->authorization_data[0]->length)
 423         {
 424                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 425
 426                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 427                             KRB5_AUTHDATA_IF_RELEVANT) {
 428                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 429                                         tkt->enc_part2->authorization_data[i]->ad_type));
 430                                 continue;
 431                         }
 432
 433                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 434                                                       tkt->enc_part2->authorization_data[i]->length);
 435
 436                         /* check if it is a PAC */
 437                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 438                         data_blob_free(&auth_data_wrapped);
 439
 440                         if (got_auth_data_pac) {
 441                                 return true;
 442                         }
 443                 }
 444
 445                 return got_auth_data_pac;
 446         }
 447
 448 #else
 449         if (tkt->ticket.authorization_data &&
 450             tkt->ticket.authorization_data->len)
 451         {
 452                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 453
 454                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 455                             KRB5_AUTHDATA_IF_RELEVANT) {
 456                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 457                                         tkt->ticket.authorization_data->val[i].ad_type));
 458                                 continue;
 459                         }
 460
 461                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 462                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 463
 464                         /* check if it is a PAC */
 465                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 466                         data_blob_free(&auth_data_wrapped);
 467
 468                         if (got_auth_data_pac) {
 469                                 return true;
 470                         }
 471                 }
 472
 473                 return got_auth_data_pac;
 474         }
 475 #endif
 476         return False;
 477 }
 478
 479  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 480 {
 481 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 482         return tkt->enc_part2->client;
 483 #else
 484         return tkt->client;
 485 #endif
 486 }
 487
 488 #if !defined(HAVE_KRB5_LOCATE_KDC)
 489
 490 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 491  * to a public interface for this functionality, so we have to be able to live
 492  * without it if the MIT libraries are hiding their internal symbols.
 493  */
 494
 495 #if defined(KRB5_KRBHST_INIT)
 496 /* Heimdal */
 497  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 498 {
 499         krb5_krbhst_handle hnd;
 500         krb5_krbhst_info *hinfo;
 501         krb5_error_code rc;
 502         int num_kdcs, i;
 503         struct sockaddr *sa;
 504         struct addrinfo *ai;
 505
 506         *addr_pp = NULL;
 507         *naddrs = 0;
 508
 509         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 510         if (rc) {
 511                 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 512                 return rc;
 513         }
 514
 515         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 516                 ;
 517
 518         krb5_krbhst_reset(ctx, hnd);
 519
 520         if (!num_kdcs) {
 521                 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
 522                 krb5_krbhst_free(ctx, hnd);
 523                 return -1;
 524         }
 525
 526         sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
 527         if (!sa) {
 528                 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
 529                 krb5_krbhst_free(ctx, hnd);
 530                 naddrs = 0;
 531                 return -1;
 532         }
 533
 534         memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
 535
 536         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 537
 538 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 539                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
 540                 if (rc) {
 541                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 542                         continue;
 543                 }
 544 #endif
 545                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 546                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 547         }
 548
 549         krb5_krbhst_free(ctx, hnd);
 550
 551         *naddrs = num_kdcs;
 552         *addr_pp = sa;
 553         return 0;
 554 }
 555
 556 #else /* ! defined(KRB5_KRBHST_INIT) */
 557
 558  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 559                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 560 {
 561         DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
 562         return KRB5_KDC_UNREACH;
 563 }
 564
 565 #endif /* KRB5_KRBHST_INIT */
 566
 567 #else /* ! HAVE_KRB5_LOCATE_KDC */
 568
 569  krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
 570                 struct sockaddr **addr_pp, int *naddrs, int get_masters)
 571 {
 572         return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
 573 }
 574
 575 #endif /* HAVE_KRB5_LOCATE_KDC */
 576
 577 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 578  void krb5_free_unparsed_name(krb5_context context, char *val)
 579 {
 580         SAFE_FREE(val);
 581 }
 582 #endif
 583
 584  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 585 {
 586 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 587         if (pdata->data) {
 588                 krb5_free_data_contents(context, pdata);
 589         }
 590 #else
 591         SAFE_FREE(pdata->data);
 592 #endif
 593 }
 594
 595  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 596 {
 597 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 598         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 599 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 600         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 601 #else
 602 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 603 #endif
 604 }
 605
 606  bool kerberos_compatible_enctypes(krb5_context context,
 607                                   krb5_enctype enctype1,
 608                                   krb5_enctype enctype2)
 609 {
 610 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 611         krb5_boolean similar = 0;
 612
 613         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 614         return similar ? True : False;
 615 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 616         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 617 #endif
 618 }
 619
 620 static bool ads_cleanup_expired_creds(krb5_context context,
 621                                       krb5_ccache  ccache,
 622                                       krb5_creds  *credsp)
 623 {
 624         krb5_error_code retval;
 625         const char *cc_type = krb5_cc_get_type(context, ccache);
 626
 627         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 628                   cc_type, krb5_cc_get_name(context, ccache),
 629                   http_timestring(talloc_tos(), credsp->times.endtime)));
 630
 631         /* we will probably need new tickets if the current ones
 632            will expire within 10 seconds.
 633         */
 634         if (credsp->times.endtime >= (time(NULL) + 10))
 635                 return False;
 636
 637         /* heimdal won't remove creds from a file ccache, and
 638            perhaps we shouldn't anyway, since internally we
 639            use memory ccaches, and a FILE one probably means that
 640            we're using creds obtained outside of our exectuable
 641         */
 642         if (strequal(cc_type, "FILE")) {
 643                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 644                 return False;
 645         }
 646
 647         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 648         if (retval) {
 649                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 650                           error_message(retval)));
 651                 /* If we have an error in this, we want to display it,
 652                    but continue as though we deleted it */
 653         }
 654         return True;
 655 }
 656
 657 /* Allocate and setup the auth context into the state we need. */
 658
 659 static krb5_error_code setup_auth_context(krb5_context context,
 660                         krb5_auth_context *auth_context)
 661 {
 662         krb5_error_code retval;
 663
 664         retval = krb5_auth_con_init(context, auth_context );
 665         if (retval) {
 666                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 667                         error_message(retval)));
 668                 return retval;
 669         }
 670
 671         /* Ensure this is an addressless ticket. */
 672         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 673         if (retval) {
 674                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 675                         error_message(retval)));
 676         }
 677
 678         return retval;
 679 }
 680
 681 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 682                                                 uint32_t gss_flags)
 683 {
 684         unsigned int orig_length = in_data->length;
 685         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 686         char *gss_cksum = NULL;
 687
 688         if (orig_length) {
 689                 /* Extra length field for delgated ticket. */
 690                 base_cksum_size += 4;
 691         }
 692
 693         if ((unsigned int)base_cksum_size + orig_length <
 694                         (unsigned int)base_cksum_size) {
 695                 return EINVAL;
 696         }
 697
 698         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 699         if (gss_cksum == NULL) {
 700                 return ENOMEM;
 701         }
 702
 703         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 704         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 705
 706         /* Precalculated MD5sum of NULL channel bindings (20 bytes) */
 707         /* Channel bindings are: (all ints encoded as little endian)
 708
 709                 [4 bytes] initiator_addrtype (255 for null bindings)
 710                 [4 bytes] initiator_address length
 711                         [n bytes] .. initiator_address data - not present
 712                                      in null bindings.
 713                 [4 bytes] acceptor_addrtype (255 for null bindings)
 714                 [4 bytes] acceptor_address length
 715                         [n bytes] .. acceptor_address data - not present
 716                                      in null bindings.
 717                 [4 bytes] application_data length
 718                         [n bytes] .. application_ data - not present
 719                                      in null bindings.
 720                 MD5 of this is ""\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18"
 721         */
 722
 723         memcpy(&gss_cksum[4],
 724                 "\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18",
 725                 GSSAPI_BNDLENGTH);
 726
 727         SIVAL(gss_cksum, 20, gss_flags);
 728
 729         if (orig_length) {
 730                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 731                 SSVAL(gss_cksum, 26, orig_length);
 732                 /* Copy the kerberos KRB_CRED data */
 733                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 734                 free(in_data->data);
 735                 in_data->data = NULL;
 736                 in_data->length = 0;
 737         }
 738         in_data->data = gss_cksum;
 739         in_data->length = base_cksum_size + orig_length;
 740         return 0;
 741 }
 742
 743 /*
 744   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 745 */
 746 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 747                                        krb5_auth_context *auth_context,
 748                                        const krb5_flags ap_req_options,
 749                                        const char *principal,
 750                                        krb5_ccache ccache,
 751                                        krb5_data *outbuf,
 752                                        time_t *expire_time,
 753                                        const char *impersonate_princ_s)
 754 {
 755         krb5_error_code           retval;
 756         krb5_principal    server;
 757         krb5_principal impersonate_princ = NULL;
 758         krb5_creds              * credsp;
 759         krb5_creds                creds;
 760         krb5_data in_data;
 761         bool creds_ready = False;
 762         int i = 0, maxtries = 3;
 763         uint32_t gss_flags = 0;
 764
 765         ZERO_STRUCT(in_data);
 766
 767         retval = smb_krb5_parse_name(context, principal, &server);
 768         if (retval) {
 769                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 770                 return retval;
 771         }
 772
 773         if (impersonate_princ_s) {
 774                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 775                                              &impersonate_princ);
 776                 if (retval) {
 777                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 778                         goto cleanup_princ;
 779                 }
 780         }
 781
 782         /* obtain ticket & session key */
 783         ZERO_STRUCT(creds);
 784         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 785                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 786                          error_message(retval)));
 787                 goto cleanup_princ;
 788         }
 789
 790         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 791                 /* This can commonly fail on smbd startup with no ticket in the cache.
 792                  * Report at higher level than 1. */
 793                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 794                          error_message(retval)));
 795                 goto cleanup_creds;
 796         }
 797
 798         while (!creds_ready && (i < maxtries)) {
 799
 800                 if ((retval = smb_krb5_get_credentials(context, ccache,
 801                                                        creds.client,
 802                                                        creds.server,
 803                                                        impersonate_princ,
 804                                                        &credsp))) {
 805                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 806                                 principal, error_message(retval)));
 807                         goto cleanup_creds;
 808                 }
 809
 810                 /* cope with ticket being in the future due to clock skew */
 811                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 812                         time_t t = time(NULL);
 813                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 814                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 815                         krb5_set_real_time(context, t + time_offset + 1, 0);
 816                 }
 817
 818                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 819                         creds_ready = True;
 820                 }
 821
 822                 i++;
 823         }
 824
 825         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 826                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 827                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 828                   (unsigned)credsp->times.endtime));
 829
 830         if (expire_time) {
 831                 *expire_time = (time_t)credsp->times.endtime;
 832         }
 833
 834         /* Allocate the auth_context. */
 835         retval = setup_auth_context(context, auth_context);
 836         if (retval) {
 837                 DEBUG(1,("setup_auth_context failed (%s)\n",
 838                         error_message(retval)));
 839                 goto cleanup_creds;
 840         }
 841
 842 #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)
 843         if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 844                 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 845                  as part of the kerberos exchange. */
 846
 847                 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 848
 849                 retval = krb5_auth_con_setuseruserkey(context,
 850                                         *auth_context,
 851                                         &credsp->keyblock );
 852                 if (retval) {
 853                         DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 854                                 error_message(retval)));
 855                         goto cleanup_creds;
 856                 }
 857
 858                 /* Must use a subkey for forwarded tickets. */
 859                 retval = krb5_auth_con_setflags(context,
 860                                 *auth_context,
 861                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 862                 if (retval) {
 863                         DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 864                                 error_message(retval)));
 865                         goto cleanup_creds;
 866                 }
 867
 868                 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 869                                 *auth_context,  /* Authentication context [in] */
 870                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 871                                 credsp->client, /* Client principal for the tgt [in] */
 872                                 credsp->server, /* Server principal for the tgt [in] */
 873                                 ccache,         /* Credential cache to use for storage [in] */
 874                                 1,              /* Turn on for "Forwardable ticket" [in] */
 875                                 &in_data );     /* Resulting response [out] */
 876
 877                 if (retval) {
 878                         DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 879                                    error_message( retval ) ) );
 880
 881                         /*
 882                          * This is not fatal. Delete the *auth_context and continue
 883                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 884                          */
 885
 886                         if (in_data.data) {
 887                                 free( in_data.data );
 888                                 in_data.data = NULL;
 889                                 in_data.length = 0;
 890                         }
 891                         krb5_auth_con_free(context, *auth_context);
 892                         *auth_context = NULL;
 893                         retval = setup_auth_context(context, auth_context);
 894                         if (retval) {
 895                                 DEBUG(1,("setup_auth_context failed (%s)\n",
 896                                         error_message(retval)));
 897                                 goto cleanup_creds;
 898                         }
 899                 } else {
 900                         /* We got a delegated ticket. */
 901                         gss_flags |= GSS_C_DELEG_FLAG;
 902                 }
 903         }
 904 #endif
 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 #if defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 913         /* We always want GSS-checksum types. */
 914         retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 915         if (retval) {
 916                 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 917                         error_message(retval)));
 918                 goto cleanup_data;
 919         }
 920 #endif
 921
 922         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 923                                       &in_data, credsp, outbuf);
 924         if (retval) {
 925                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 926                          error_message(retval)));
 927         }
 928
 929 cleanup_data:
 930         if (in_data.data) {
 931                 free( in_data.data );
 932                 in_data.length = 0;
 933         }
 934
 935         krb5_free_creds(context, credsp);
 936
 937 cleanup_creds:
 938         krb5_free_cred_contents(context, &creds);
 939
 940 cleanup_princ:
 941         krb5_free_principal(context, server);
 942         if (impersonate_princ) {
 943                 krb5_free_principal(context, impersonate_princ);
 944         }
 945
 946         return retval;
 947 }
 948
 949 /*
 950   get a kerberos5 ticket for the given service
 951 */
 952 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 953                         const char *principal, time_t time_offset,
 954                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 955                         uint32_t extra_ap_opts, const char *ccname,
 956                         time_t *tgs_expire,
 957                         const char *impersonate_princ_s)
 958
 959 {
 960         krb5_error_code retval;
 961         krb5_data packet;
 962         krb5_context context = NULL;
 963         krb5_ccache ccdef = NULL;
 964         krb5_auth_context auth_context = NULL;
 965         krb5_enctype enc_types[] = {
 966 #ifdef ENCTYPE_ARCFOUR_HMAC
 967                 ENCTYPE_ARCFOUR_HMAC,
 968 #endif
 969                 ENCTYPE_DES_CBC_MD5,
 970                 ENCTYPE_DES_CBC_CRC,
 971                 ENCTYPE_NULL};
 972
 973         initialize_krb5_error_table();
 974         retval = krb5_init_context(&context);
 975         if (retval) {
 976                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 977                          error_message(retval)));
 978                 goto failed;
 979         }
 980
 981         if (time_offset != 0) {
 982                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 983         }
 984
 985         if ((retval = krb5_cc_resolve(context, ccname ?
 986                         ccname : krb5_cc_default_name(context), &ccdef))) {
 987                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 988                          error_message(retval)));
 989                 goto failed;
 990         }
 991
 992         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 993                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 994                          error_message(retval)));
 995                 goto failed;
 996         }
 997
 998         retval = ads_krb5_mk_req(context, &auth_context,
 999                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
1000                                 principal, ccdef, &packet,
1001                                 tgs_expire, impersonate_princ_s);
1002         if (retval) {
1003                 goto failed;
1004         }
1005
1006         get_krb5_smb_session_key(mem_ctx, context, auth_context,
1007                                  session_key_krb5, false);
1008
1009         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
1010
1011         kerberos_free_data_contents(context, &packet);
1012
1013 failed:
1014
1015         if (context) {
1016                 if (ccdef)
1017                         krb5_cc_close(context, ccdef);
1018                 if (auth_context)
1019                         krb5_auth_con_free(context, auth_context);
1020                 krb5_free_context(context);
1021         }
1022
1023         return retval;
1024 }
1025
1026 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
1027                               krb5_context context,
1028                               krb5_auth_context auth_context,
1029                               DATA_BLOB *session_key, bool remote)
1030 {
1031         krb5_keyblock *skey = NULL;
1032         krb5_error_code err = 0;
1033         bool ret = false;
1034
1035         if (remote) {
1036                 err = krb5_auth_con_getremotesubkey(context,
1037                                                     auth_context, &skey);
1038         } else {
1039                 err = krb5_auth_con_getlocalsubkey(context,
1040                                                    auth_context, &skey);
1041         }
1042
1043         if (err || skey == NULL) {
1044                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1045                 goto done;
1046         }
1047
1048         DEBUG(10, ("Got KRB5 session key of length %d\n",
1049                    (int)KRB5_KEY_LENGTH(skey)));
1050
1051         *session_key = data_blob_talloc(mem_ctx,
1052                                          KRB5_KEY_DATA(skey),
1053                                          KRB5_KEY_LENGTH(skey));
1054         dump_data_pw("KRB5 Session Key:\n",
1055                      session_key->data,
1056                      session_key->length);
1057
1058         ret = true;
1059
1060 done:
1061         if (skey) {
1062                 krb5_free_keyblock(context, skey);
1063         }
1064
1065         return ret;
1066 }
1067
1068
1069 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
1070  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
1071
1072  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
1073 {
1074         static krb5_data kdata;
1075
1076         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
1077         kdata.length = strlen((const char *)kdata.data);
1078         return &kdata;
1079 }
1080 #endif
1081
1082  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
1083 {
1084 /* Try krb5_free_keytab_entry_contents first, since
1085  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1086  * krb5_kt_free_entry but only has a prototype for the first, while the
1087  * second is considered private.
1088  */
1089 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1090         return krb5_free_keytab_entry_contents(context, kt_entry);
1091 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1092         return krb5_kt_free_entry(context, kt_entry);
1093 #else
1094 #error UNKNOWN_KT_FREE_FUNCTION
1095 #endif
1096 }
1097
1098  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1099                                      struct PAC_SIGNATURE_DATA *sig)
1100 {
1101 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1102         cksum->cksumtype        = (krb5_cksumtype)sig->type;
1103         cksum->checksum.length  = sig->signature.length;
1104         cksum->checksum.data    = sig->signature.data;
1105 #else
1106         cksum->checksum_type    = (krb5_cksumtype)sig->type;
1107         cksum->length           = sig->signature.length;
1108         cksum->contents         = sig->signature.data;
1109 #endif
1110 }
1111
1112  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1113                                           const krb5_keyblock *keyblock,
1114                                          krb5_keyusage usage,
1115                                          krb5_checksum *cksum,
1116                                          uint8 *data,
1117                                          size_t length)
1118 {
1119         krb5_error_code ret;
1120
1121         /* verify the checksum */
1122
1123         /* welcome to the wonderful world of samba's kerberos abstraction layer:
1124          *
1125          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
1126          * -----------------------------------------------------------------------------
1127          * krb5_c_verify_checksum       -                       works           works
1128          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
1129          */
1130
1131 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1132         {
1133                 krb5_boolean checksum_valid = False;
1134                 krb5_data input;
1135
1136                 input.data = (char *)data;
1137                 input.length = length;
1138
1139                 ret = krb5_c_verify_checksum(context,
1140                                              keyblock,
1141                                              usage,
1142                                              &input,
1143                                              cksum,
1144                                              &checksum_valid);
1145                 if (ret) {
1146                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1147                                 error_message(ret)));
1148                         return ret;
1149                 }
1150
1151                 if (!checksum_valid)
1152                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1153         }
1154
1155 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1156
1157         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1158          * without enctype and it ignores any key_usage types - Guenther */
1159
1160         {
1161
1162                 krb5_crypto crypto;
1163                 ret = krb5_crypto_init(context,
1164                                        keyblock,
1165                                        0,
1166                                        &crypto);
1167                 if (ret) {
1168                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1169                                 error_message(ret)));
1170                         return ret;
1171                 }
1172
1173                 ret = krb5_verify_checksum(context,
1174                                            crypto,
1175                                            usage,
1176                                            data,
1177                                            length,
1178                                            cksum);
1179
1180                 krb5_crypto_destroy(context, crypto);
1181         }
1182
1183 #else
1184 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1185 #endif
1186
1187         return ret;
1188 }
1189
1190  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1191 {
1192 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1193         return tkt->enc_part2->times.authtime;
1194 #else
1195         return tkt->ticket.authtime;
1196 #endif
1197 }
1198
1199 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1200 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1201 {
1202 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1203         if (ap_req->ticket->enc_part.kvno)
1204                 return ap_req->ticket->enc_part.kvno;
1205 #else /* Heimdal */
1206         if (ap_req->ticket.enc_part.kvno)
1207                 return *ap_req->ticket.enc_part.kvno;
1208 #endif
1209         return 0;
1210 }
1211
1212 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1213 {
1214 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1215         return ap_req->ticket.enc_part.etype;
1216 #else /* MIT */
1217         return ap_req->ticket->enc_part.enctype;
1218 #endif
1219 }
1220 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1221
1222 static krb5_error_code
1223 get_key_from_keytab(krb5_context context,
1224                     krb5_const_principal server,
1225                     krb5_enctype enctype,
1226                     krb5_kvno kvno,
1227                     krb5_keyblock **out_key)
1228 {
1229         krb5_keytab_entry entry;
1230         krb5_error_code ret;
1231         krb5_keytab keytab;
1232         char *name = NULL;
1233         krb5_keyblock *keyp;
1234
1235         /* We have to open a new keytab handle here, as MIT does
1236            an implicit open/getnext/close on krb5_kt_get_entry. We
1237            may be in the middle of a keytab enumeration when this is
1238            called. JRA. */
1239
1240         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1241         if (ret) {
1242                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1243                 return ret;
1244         }
1245
1246         if ( DEBUGLEVEL >= 10 ) {
1247                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1248                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1249                                 kvno, enctype, name));
1250                         TALLOC_FREE(name);
1251                 }
1252         }
1253
1254         ret = krb5_kt_get_entry(context,
1255                                 keytab,
1256                                 server,
1257                                 kvno,
1258                                 enctype,
1259                                 &entry);
1260
1261         if (ret) {
1262                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1263                 goto out;
1264         }
1265
1266         keyp = KRB5_KT_KEY(&entry);
1267
1268         ret = krb5_copy_keyblock(context, keyp, out_key);
1269         if (ret) {
1270                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1271                 goto out;
1272         }
1273
1274         smb_krb5_kt_free_entry(context, &entry);
1275
1276 out:
1277         krb5_kt_close(context, keytab);
1278         return ret;
1279 }
1280
1281 /* Prototypes */
1282
1283  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1284                                                  const krb5_data *inbuf,
1285                                                  krb5_kvno *kvno,
1286                                                  krb5_enctype *enctype)
1287 {
1288 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1289         {
1290                 krb5_error_code ret;
1291                 krb5_ap_req ap_req;
1292
1293                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1294                 if (ret)
1295                         return ret;
1296
1297                 *kvno = get_kvno_from_ap_req(&ap_req);
1298                 *enctype = get_enctype_from_ap_req(&ap_req);
1299
1300                 free_AP_REQ(&ap_req);
1301                 return 0;
1302         }
1303 #endif
1304
1305         /* Possibly not an appropriate error code. */
1306         return KRB5KDC_ERR_BADOPTION;
1307 }
1308
1309  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1310                                                         krb5_auth_context *auth_context,
1311                                                         const krb5_data *inbuf,
1312                                                         krb5_const_principal server,
1313                                                         krb5_keytab keytab,
1314                                                         krb5_flags *ap_req_options,
1315                                                         krb5_ticket **ticket,
1316                                                         krb5_keyblock **keyblock)
1317 {
1318         krb5_error_code ret;
1319         krb5_kvno kvno;
1320         krb5_enctype enctype;
1321         krb5_keyblock *local_keyblock;
1322
1323         ret = krb5_rd_req(context,
1324                           auth_context,
1325                           inbuf,
1326                           server,
1327                           keytab,
1328                           ap_req_options,
1329                           ticket);
1330         if (ret) {
1331                 return ret;
1332         }
1333
1334 #ifdef KRB5_TICKET_HAS_KEYINFO
1335         enctype = (*ticket)->enc_part.enctype;
1336         kvno = (*ticket)->enc_part.kvno;
1337 #else
1338         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1339         if (ret) {
1340                 return ret;
1341         }
1342 #endif
1343
1344         ret = get_key_from_keytab(context,
1345                                   server,
1346                                   enctype,
1347                                   kvno,
1348                                   &local_keyblock);
1349         if (ret) {
1350                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1351                 goto out;
1352         }
1353
1354 out:
1355         if (ret && local_keyblock != NULL) {
1356                 krb5_free_keyblock(context, local_keyblock);
1357         } else {
1358                 *keyblock = local_keyblock;
1359         }
1360
1361         return ret;
1362 }
1363
1364  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1365                                             const char *name,
1366                                             krb5_principal *principal)
1367 {
1368 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1369         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1370 #endif
1371
1372         /* we are cheating here because parse_name will in fact set the realm.
1373          * We don't care as the only caller of smb_krb5_parse_name_norealm
1374          * ignores the realm anyway when calling
1375          * smb_krb5_principal_compare_any_realm later - Guenther */
1376
1377         return smb_krb5_parse_name(context, name, principal);
1378 }
1379
1380  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1381                                           krb5_const_principal princ1,
1382                                           krb5_const_principal princ2)
1383 {
1384 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1385
1386         return krb5_principal_compare_any_realm(context, princ1, princ2);
1387
1388 /* krb5_princ_size is a macro in MIT */
1389 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1390
1391         int i, len1, len2;
1392         const krb5_data *p1, *p2;
1393
1394         len1 = krb5_princ_size(context, princ1);
1395         len2 = krb5_princ_size(context, princ2);
1396
1397         if (len1 != len2)
1398                 return False;
1399
1400         for (i = 0; i < len1; i++) {
1401
1402                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1403                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1404
1405                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1406                         return False;
1407         }
1408
1409         return True;
1410 #else
1411 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1412 #endif
1413 }
1414
1415  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1416                                        const char *client_string,       /* gd@BER.SUSE.DE */
1417                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1418                                        time_t *expire_time)
1419 {
1420         krb5_error_code ret;
1421         krb5_context context = NULL;
1422         krb5_ccache ccache = NULL;
1423         krb5_principal client = NULL;
1424         krb5_creds creds, creds_in, *creds_out = NULL;
1425
1426         ZERO_STRUCT(creds);
1427         ZERO_STRUCT(creds_in);
1428
1429         initialize_krb5_error_table();
1430         ret = krb5_init_context(&context);
1431         if (ret) {
1432                 goto done;
1433         }
1434
1435         if (!ccache_string) {
1436                 ccache_string = krb5_cc_default_name(context);
1437         }
1438
1439         if (!ccache_string) {
1440                 ret = EINVAL;
1441                 goto done;
1442         }
1443
1444         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1445
1446         /* FIXME: we should not fall back to defaults */
1447         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1448         if (ret) {
1449                 goto done;
1450         }
1451
1452         if (client_string) {
1453                 ret = smb_krb5_parse_name(context, client_string, &client);
1454                 if (ret) {
1455                         goto done;
1456                 }
1457         } else {
1458                 ret = krb5_cc_get_principal(context, ccache, &client);
1459                 if (ret) {
1460                         goto done;
1461                 }
1462         }
1463
1464 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1465         {
1466                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1467                 if (ret) {
1468                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1469                         goto done;
1470                 }
1471         }
1472 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1473         {
1474                 krb5_kdc_flags flags;
1475                 krb5_realm *client_realm = NULL;
1476
1477                 ret = krb5_copy_principal(context, client, &creds_in.client);
1478                 if (ret) {
1479                         goto done;
1480                 }
1481
1482                 if (service_string) {
1483                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1484                         if (ret) {
1485                                 goto done;
1486                         }
1487                 } else {
1488                         /* build tgt service by default */
1489                         client_realm = krb5_princ_realm(context, creds_in.client);
1490                         if (!client_realm) {
1491                                 ret = ENOMEM;
1492                                 goto done;
1493                         }
1494                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1495                         if (ret) {
1496                                 goto done;
1497                         }
1498                 }
1499
1500                 flags.i = 0;
1501                 flags.b.renewable = flags.b.renew = True;
1502
1503                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1504                 if (ret) {
1505                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1506                         goto done;
1507                 }
1508
1509                 creds = *creds_out;
1510         }
1511 #else
1512 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1513 #endif
1514
1515         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1516         ret = krb5_cc_initialize(context, ccache, client);
1517         if (ret) {
1518                 goto done;
1519         }
1520
1521         ret = krb5_cc_store_cred(context, ccache, &creds);
1522
1523         if (expire_time) {
1524                 *expire_time = (time_t) creds.times.endtime;
1525         }
1526
1527 done:
1528         krb5_free_cred_contents(context, &creds_in);
1529
1530         if (creds_out) {
1531                 krb5_free_creds(context, creds_out);
1532         } else {
1533                 krb5_free_cred_contents(context, &creds);
1534         }
1535
1536         if (client) {
1537                 krb5_free_principal(context, client);
1538         }
1539         if (ccache) {
1540                 krb5_cc_close(context, ccache);
1541         }
1542         if (context) {
1543                 krb5_free_context(context);
1544         }
1545
1546         return ret;
1547 }
1548
1549  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1550 {
1551         krb5_error_code ret = 0;
1552         if (addr == NULL) {
1553                 return ret;
1554         }
1555 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1556         krb5_free_addresses(context, addr->addrs);
1557 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1558         ret = krb5_free_addresses(context, addr->addrs);
1559         SAFE_FREE(addr->addrs);
1560 #endif
1561         SAFE_FREE(addr);
1562         addr = NULL;
1563         return ret;
1564 }
1565
1566  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1567 {
1568         krb5_error_code ret = 0;
1569         nstring buf;
1570 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1571         krb5_address **addrs = NULL;
1572 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1573         krb5_addresses *addrs = NULL;
1574 #endif
1575
1576         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1577         if (*kerb_addr == NULL) {
1578                 return ENOMEM;
1579         }
1580
1581         put_name(buf, global_myname(), ' ', 0x20);
1582
1583 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1584         {
1585                 int num_addr = 2;
1586
1587                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1588                 if (addrs == NULL) {
1589                         SAFE_FREE(*kerb_addr);
1590                         return ENOMEM;
1591                 }
1592
1593                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1594
1595                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1596                 if (addrs[0] == NULL) {
1597                         SAFE_FREE(addrs);
1598                         SAFE_FREE(*kerb_addr);
1599                         return ENOMEM;
1600                 }
1601
1602                 addrs[0]->magic = KV5M_ADDRESS;
1603                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1604                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1605                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1606                 if (addrs[0]->contents == NULL) {
1607                         SAFE_FREE(addrs[0]);
1608                         SAFE_FREE(addrs);
1609                         SAFE_FREE(*kerb_addr);
1610                         return ENOMEM;
1611                 }
1612
1613                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1614
1615                 addrs[1] = NULL;
1616         }
1617 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1618         {
1619                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1620                 if (addrs == NULL) {
1621                         SAFE_FREE(*kerb_addr);
1622                         return ENOMEM;
1623                 }
1624
1625                 memset(addrs, 0, sizeof(krb5_addresses));
1626
1627                 addrs->len = 1;
1628                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1629                 if (addrs->val == NULL) {
1630                         SAFE_FREE(addrs);
1631                         SAFE_FREE(kerb_addr);
1632                         return ENOMEM;
1633                 }
1634
1635                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1636                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1637                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1638                 if (addrs->val[0].address.data == NULL) {
1639                         SAFE_FREE(addrs->val);
1640                         SAFE_FREE(addrs);
1641                         SAFE_FREE(*kerb_addr);
1642                         return ENOMEM;
1643                 }
1644
1645                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1646         }
1647 #else
1648 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1649 #endif
1650         (*kerb_addr)->addrs = addrs;
1651
1652         return ret;
1653 }
1654
1655  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1656 {
1657 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1658         krb5_free_error_contents(context, krberror);
1659 #else /* MIT */
1660         krb5_free_error(context, krberror);
1661 #endif
1662 }
1663
1664  krb5_error_code handle_krberror_packet(krb5_context context,
1665                                         krb5_data *packet)
1666 {
1667         krb5_error_code ret;
1668         bool got_error_code = False;
1669
1670         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1671
1672 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1673         {
1674                 krb5_error krberror;
1675
1676                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1677                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1678                                 error_message(ret)));
1679                         return ret;
1680                 }
1681
1682                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1683                         ret = (krb5_error_code) krberror.error_code;
1684                         got_error_code = True;
1685                 }
1686
1687                 smb_krb5_free_error(context, &krberror);
1688         }
1689 #else /* MIT */
1690         {
1691                 krb5_error *krberror;
1692
1693                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1694                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1695                                 error_message(ret)));
1696                         return ret;
1697                 }
1698
1699                 if (krberror->e_data.data == NULL) {
1700 #if defined(ERROR_TABLE_BASE_krb5)
1701                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1702 #else
1703                         ret = (krb5_error_code)krberror->error;
1704 #endif
1705                         got_error_code = True;
1706                 }
1707                 smb_krb5_free_error(context, krberror);
1708         }
1709 #endif
1710         if (got_error_code) {
1711                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1712                         error_message(ret), ret));
1713         }
1714         return ret;
1715 }
1716
1717  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1718                                             krb5_get_init_creds_opt **opt)
1719 {
1720 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1721         /* Heimdal or modern MIT version */
1722         return krb5_get_init_creds_opt_alloc(context, opt);
1723 #else
1724         /* Historical MIT version */
1725         krb5_get_init_creds_opt *my_opt;
1726
1727         *opt = NULL;
1728
1729         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1730                 return ENOMEM;
1731         }
1732
1733         krb5_get_init_creds_opt_init(my_opt);
1734
1735         *opt =  my_opt;
1736         return 0;
1737 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1738 }
1739
1740  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1741                                 krb5_get_init_creds_opt *opt)
1742 {
1743 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1744
1745 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1746         /* Modern MIT or Heimdal version */
1747         krb5_get_init_creds_opt_free(context, opt);
1748 #else
1749         /* Heimdal version */
1750         krb5_get_init_creds_opt_free(opt);
1751 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1752
1753 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1754         /* Historical MIT version */
1755         SAFE_FREE(opt);
1756         opt = NULL;
1757 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1758 }
1759
1760  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1761 {
1762         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1763 }
1764
1765
1766 /* caller needs to free etype_s */
1767  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1768                                             krb5_enctype enctype,
1769                                             char **etype_s)
1770 {
1771 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1772         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1773 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1774         char buf[256];
1775         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1776         if (ret) {
1777                 return ret;
1778         }
1779         *etype_s = SMB_STRDUP(buf);
1780         if (!*etype_s) {
1781                 return ENOMEM;
1782         }
1783         return ret;
1784 #else
1785 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1786 #endif
1787 }
1788
1789  krb5_error_code smb_krb5_mk_error(krb5_context context,
1790                                 krb5_error_code error_code,
1791                                 const krb5_principal server,
1792                                 krb5_data *reply)
1793 {
1794 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1795         /*
1796          * The MIT interface is *terrible*.
1797          * We have to construct this ourselves...
1798          */
1799         krb5_error e;
1800
1801         memset(&e, 0, sizeof(e));
1802         krb5_us_timeofday(context, &e.stime, &e.susec);
1803         e.server = server;
1804 #if defined(krb5_err_base)
1805         e.error = error_code - krb5_err_base;
1806 #elif defined(ERROR_TABLE_BASE_krb5)
1807         e.error = error_code - ERROR_TABLE_BASE_krb5;
1808 #else
1809         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1810 #endif
1811
1812         return krb5_mk_error(context, &e, reply);
1813 #else /* Heimdal. */
1814         return krb5_mk_error(context,
1815                                 error_code,
1816                                 NULL,
1817                                 NULL, /* e_data */
1818                                 NULL,
1819                                 server,
1820                                 NULL,
1821                                 NULL,
1822                                 reply);
1823 #endif
1824 }
1825
1826 /**********************************************************************
1827  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1828  * allows to process non-default keytab names.
1829  * @param context krb5_context
1830  * @param keytab_name_req string
1831  * @param write_access bool if writable keytab is required
1832  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1833  * @return krb5_error_code
1834 **********************************************************************/
1835
1836 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1837 #ifndef MAX_KEYTAB_NAME_LEN
1838 #define MAX_KEYTAB_NAME_LEN 1100
1839 #endif
1840
1841  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1842                                       const char *keytab_name_req,
1843                                       bool write_access,
1844                                       krb5_keytab *keytab)
1845 {
1846         krb5_error_code ret = 0;
1847         TALLOC_CTX *mem_ctx;
1848         char keytab_string[MAX_KEYTAB_NAME_LEN];
1849         char *kt_str = NULL;
1850         bool found_valid_name = False;
1851         const char *pragma = "FILE";
1852         const char *tmp = NULL;
1853
1854         if (!write_access && !keytab_name_req) {
1855                 /* caller just wants to read the default keytab readonly, so be it */
1856                 return krb5_kt_default(context, keytab);
1857         }
1858
1859         mem_ctx = talloc_init("smb_krb5_open_keytab");
1860         if (!mem_ctx) {
1861                 return ENOMEM;
1862         }
1863
1864 #ifdef HAVE_WRFILE_KEYTAB
1865         if (write_access) {
1866                 pragma = "WRFILE";
1867         }
1868 #endif
1869
1870         if (keytab_name_req) {
1871
1872                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1873                         ret = KRB5_CONFIG_NOTENUFSPACE;
1874                         goto out;
1875                 }
1876
1877                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1878                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1879                         tmp = keytab_name_req;
1880                         goto resolve;
1881                 }
1882
1883                 if (keytab_name_req[0] != '/') {
1884                         ret = KRB5_KT_BADNAME;
1885                         goto out;
1886                 }
1887
1888                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1889                 if (!tmp) {
1890                         ret = ENOMEM;
1891                         goto out;
1892                 }
1893
1894                 goto resolve;
1895         }
1896
1897         /* we need to handle more complex keytab_strings, like:
1898          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1899
1900         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1901         if (ret) {
1902                 goto out;
1903         }
1904
1905         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1906
1907         tmp = talloc_strdup(mem_ctx, keytab_string);
1908         if (!tmp) {
1909                 ret = ENOMEM;
1910                 goto out;
1911         }
1912
1913         if (strncmp(tmp, "ANY:", 4) == 0) {
1914                 tmp += 4;
1915         }
1916
1917         memset(&keytab_string, '\0', sizeof(keytab_string));
1918
1919         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1920                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1921                         found_valid_name = True;
1922                         tmp = kt_str;
1923                         tmp += 7;
1924                 }
1925
1926                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1927                         found_valid_name = True;
1928                         tmp = kt_str;
1929                         tmp += 5;
1930                 }
1931
1932                 if (tmp[0] == '/') {
1933                         /* Treat as a FILE: keytab definition. */
1934                         found_valid_name = true;
1935                 }
1936
1937                 if (found_valid_name) {
1938                         if (tmp[0] != '/') {
1939                                 ret = KRB5_KT_BADNAME;
1940                                 goto out;
1941                         }
1942
1943                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1944                         if (!tmp) {
1945                                 ret = ENOMEM;
1946                                 goto out;
1947                         }
1948                         break;
1949                 }
1950         }
1951
1952         if (!found_valid_name) {
1953                 ret = KRB5_KT_UNKNOWN_TYPE;
1954                 goto out;
1955         }
1956
1957  resolve:
1958         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1959         ret = krb5_kt_resolve(context, tmp, keytab);
1960
1961  out:
1962         TALLOC_FREE(mem_ctx);
1963         return ret;
1964 }
1965
1966 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1967                                      krb5_context context,
1968                                      krb5_keytab keytab,
1969                                      const char **keytab_name)
1970 {
1971         char keytab_string[MAX_KEYTAB_NAME_LEN];
1972         krb5_error_code ret = 0;
1973
1974         ret = krb5_kt_get_name(context, keytab,
1975                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1976         if (ret) {
1977                 return ret;
1978         }
1979
1980         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1981         if (!*keytab_name) {
1982                 return ENOMEM;
1983         }
1984
1985         return ret;
1986 }
1987
1988 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1989     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1990     defined(HAVE_KRB5_GET_CREDS)
1991 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1992                                                              krb5_ccache ccache,
1993                                                              krb5_principal me,
1994                                                              krb5_principal server,
1995                                                              krb5_principal impersonate_princ,
1996                                                              krb5_creds **out_creds)
1997 {
1998         krb5_error_code ret;
1999         krb5_get_creds_opt opt;
2000
2001         ret = krb5_get_creds_opt_alloc(context, &opt);
2002         if (ret) {
2003                 goto done;
2004         }
2005         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
2006
2007         if (impersonate_princ) {
2008                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
2009                                                          impersonate_princ);
2010                 if (ret) {
2011                         goto done;
2012                 }
2013         }
2014
2015         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2016         if (ret) {
2017                 goto done;
2018         }
2019
2020  done:
2021         if (opt) {
2022                 krb5_get_creds_opt_free(context, opt);
2023         }
2024         return ret;
2025 }
2026 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2027
2028 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2029 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2030                                                          krb5_ccache ccache,
2031                                                          krb5_principal me,
2032                                                          krb5_principal server,
2033                                                          krb5_principal impersonate_princ,
2034                                                          krb5_creds **out_creds)
2035 {
2036         krb5_error_code ret;
2037         krb5_creds in_creds;
2038
2039 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2040 krb5_error_code KRB5_CALLCONV
2041 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2042                               krb5_ccache ccache, krb5_creds *in_creds,
2043                               krb5_data *subject_cert,
2044                               krb5_creds **out_creds);
2045 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2046
2047         ZERO_STRUCT(in_creds);
2048
2049         if (impersonate_princ) {
2050
2051                 in_creds.server = me;
2052                 in_creds.client = impersonate_princ;
2053
2054                 ret = krb5_get_credentials_for_user(context,
2055                                                     0, /* krb5_flags options */
2056                                                     ccache,
2057                                                     &in_creds,
2058                                                     NULL, /* krb5_data *subject_cert */
2059                                                     out_creds);
2060         } else {
2061                 in_creds.client = me;
2062                 in_creds.server = server;
2063
2064                 ret = krb5_get_credentials(context, 0, ccache,
2065                                            &in_creds, out_creds);
2066         }
2067
2068         return ret;
2069 }
2070 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2071
2072 /*
2073  * smb_krb5_get_credentials
2074  *
2075  * @brief Get krb5 credentials for a server
2076  *
2077  * @param[in] context           An initialized krb5_context
2078  * @param[in] ccache            An initialized krb5_ccache
2079  * @param[in] me                The krb5_principal of the caller
2080  * @param[in] server            The krb5_principal of the requested service
2081  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2082  * @param[out] out_creds        The returned krb5_creds structure
2083  * @return krb5_error_code
2084  *
2085  */
2086 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2087                                          krb5_ccache ccache,
2088                                          krb5_principal me,
2089                                          krb5_principal server,
2090                                          krb5_principal impersonate_princ,
2091                                          krb5_creds **out_creds)
2092 {
2093         krb5_error_code ret;
2094         krb5_creds *creds = NULL;
2095
2096         *out_creds = NULL;
2097
2098         if (impersonate_princ) {
2099 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2100                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2101 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2102                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2103 #else
2104                 ret = ENOTSUP;
2105 #endif
2106         } else {
2107                 krb5_creds in_creds;
2108
2109                 ZERO_STRUCT(in_creds);
2110
2111                 in_creds.client = me;
2112                 in_creds.server = server;
2113
2114                 ret = krb5_get_credentials(context, 0, ccache,
2115                                            &in_creds, &creds);
2116         }
2117         if (ret) {
2118                 goto done;
2119         }
2120
2121         ret = krb5_cc_store_cred(context, ccache, creds);
2122         if (ret) {
2123                 goto done;
2124         }
2125
2126         if (out_creds) {
2127                 *out_creds = creds;
2128         }
2129
2130  done:
2131         if (creds && ret) {
2132                 krb5_free_creds(context, creds);
2133         }
2134
2135         return ret;
2136 }
2137
2138 /*
2139  * smb_krb5_get_creds
2140  *
2141  * @brief Get krb5 credentials for a server
2142  *
2143  * @param[in] server_s          The string name of the service
2144  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2145  * @param[in] cc                The krb5 credential cache string name (optional)
2146  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2147  * @param[out] creds_p          The returned krb5_creds structure
2148  * @return krb5_error_code
2149  *
2150  */
2151 krb5_error_code smb_krb5_get_creds(const char *server_s,
2152                                    time_t time_offset,
2153                                    const char *cc,
2154                                    const char *impersonate_princ_s,
2155                                    krb5_creds **creds_p)
2156 {
2157         krb5_error_code ret;
2158         krb5_context context = NULL;
2159         krb5_principal me = NULL;
2160         krb5_principal server = NULL;
2161         krb5_principal impersonate_princ = NULL;
2162         krb5_creds *creds = NULL;
2163         krb5_ccache ccache = NULL;
2164
2165         *creds_p = NULL;
2166
2167         initialize_krb5_error_table();
2168         ret = krb5_init_context(&context);
2169         if (ret) {
2170                 goto done;
2171         }
2172
2173         if (time_offset != 0) {
2174                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2175         }
2176
2177         ret = krb5_cc_resolve(context, cc ? cc :
2178                 krb5_cc_default_name(context), &ccache);
2179         if (ret) {
2180                 goto done;
2181         }
2182
2183         ret = krb5_cc_get_principal(context, ccache, &me);
2184         if (ret) {
2185                 goto done;
2186         }
2187
2188         ret = smb_krb5_parse_name(context, server_s, &server);
2189         if (ret) {
2190                 goto done;
2191         }
2192
2193         if (impersonate_princ_s) {
2194                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2195                                           &impersonate_princ);
2196                 if (ret) {
2197                         goto done;
2198                 }
2199         }
2200
2201         ret = smb_krb5_get_credentials(context, ccache,
2202                                        me, server, impersonate_princ,
2203                                        &creds);
2204         if (ret) {
2205                 goto done;
2206         }
2207
2208         ret = krb5_cc_store_cred(context, ccache, creds);
2209         if (ret) {
2210                 goto done;
2211         }
2212
2213         if (creds_p) {
2214                 *creds_p = creds;
2215         }
2216
2217         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2218                 server_s));
2219
2220         if (impersonate_princ_s) {
2221                 char *client = NULL;
2222
2223                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2224                 if (ret) {
2225                         goto done;
2226                 }
2227                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2228                         client));
2229                 TALLOC_FREE(client);
2230         }
2231
2232  done:
2233         if (!context) {
2234                 return ret;
2235         }
2236
2237         if (creds && ret) {
2238                 krb5_free_creds(context, creds);
2239         }
2240         if (server) {
2241                 krb5_free_principal(context, server);
2242         }
2243         if (me) {
2244                 krb5_free_principal(context, me);
2245         }
2246         if (impersonate_princ) {
2247                 krb5_free_principal(context, impersonate_princ);
2248         }
2249         if (ccache) {
2250                 krb5_cc_close(context, ccache);
2251         }
2252         krb5_free_context(context);
2253
2254         return ret;
2255 }
2256
2257 /*
2258  * smb_krb5_principal_get_realm
2259  *
2260  * @brief Get realm of a principal
2261  *
2262  * @param[in] context           The krb5_context
2263  * @param[in] principal         The principal
2264  * @return pointer to the realm
2265  *
2266  */
2267
2268 char *smb_krb5_principal_get_realm(krb5_context context,
2269                                    krb5_principal principal)
2270 {
2271 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2272         return krb5_principal_get_realm(context, principal);
2273 #elif defined(krb5_princ_realm) /* MIT */
2274         krb5_data *realm;
2275         realm = krb5_princ_realm(context, principal);
2276         return (char *)realm->data;
2277 #else
2278         return NULL;
2279 #endif
2280 }
2281
2282 #else /* HAVE_KRB5 */
2283  /* this saves a few linking headaches */
2284  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2285                         const char *principal, time_t time_offset,
2286                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2287                         uint32_t extra_ap_opts,
2288                         const char *ccname, time_t *tgs_expire,
2289                         const char *impersonate_princ_s)
2290 {
2291          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2292          return 1;
2293 }
2294
2295 #endif