lib/krb5_wrap/krb5_samba.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 "krb5_samba.h"
  25 #include "lib/util/asn1.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 #define GSS_C_DELEG_FLAG 1
  42
  43 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
  44    but still has the symbol */
  45 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
  46 krb5_error_code krb5_auth_con_set_req_cksumtype(
  47         krb5_context     context,
  48         krb5_auth_context      auth_context,
  49         krb5_cksumtype     cksumtype);
  50 #endif
  51
  52 #if !defined(SMB_MALLOC)
  53 #undef malloc
  54 #define SMB_MALLOC(s) malloc((s))
  55 #endif
  56
  57 #ifndef SMB_STRDUP
  58 #define SMB_STRDUP(s) strdup(s)
  59 #endif
  60
  61 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
  62
  63 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
  64
  65 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
  66  * to krb5_set_default_tgs_ktypes. See
  67  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
  68  *
  69  * If the MIT libraries are not exporting internal symbols, we will end up in
  70  * this branch, which is correct. Otherwise we will continue to use the
  71  * internal symbol
  72  */
  73  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  74 {
  75     return krb5_set_default_tgs_enctypes(ctx, enc);
  76 }
  77
  78 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
  79
  80 /* Heimdal */
  81  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  82 {
  83         return krb5_set_default_in_tkt_etypes(ctx, enc);
  84 }
  85
  86 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
  87
  88 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
  89
  90 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
  91 /* HEIMDAL */
  92  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
  93 {
  94         memset(pkaddr, '\0', sizeof(krb5_address));
  95 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
  96         if (paddr->ss_family == AF_INET6) {
  97                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
  98                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
  99                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 100                 return true;
 101         }
 102 #endif
 103         if (paddr->ss_family == AF_INET) {
 104                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 105                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 106                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 107                 return true;
 108         }
 109         return false;
 110 }
 111 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 112 /* MIT */
 113 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 114 {
 115         memset(pkaddr, '\0', sizeof(krb5_address));
 116 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 117         if (paddr->ss_family == AF_INET6) {
 118                 pkaddr->addrtype = ADDRTYPE_INET6;
 119                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 120                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 121                 return true;
 122         }
 123 #endif
 124         if (paddr->ss_family == AF_INET) {
 125                 pkaddr->addrtype = ADDRTYPE_INET;
 126                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 127                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 128                 return true;
 129         }
 130         return false;
 131 }
 132 #else
 133 #error UNKNOWN_ADDRTYPE
 134 #endif
 135
 136 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
 137 /* MIT */
 138 int create_kerberos_key_from_string_direct(krb5_context context,
 139                                                   krb5_principal host_princ,
 140                                                   krb5_data *password,
 141                                                   krb5_keyblock *key,
 142                                                   krb5_enctype enctype)
 143 {
 144         int ret = 0;
 145         krb5_data salt;
 146
 147         ret = krb5_principal2salt(context, host_princ, &salt);
 148         if (ret) {
 149                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 150                 return ret;
 151         }
 152         ret = krb5_c_string_to_key(context, enctype, password, &salt, key);
 153         SAFE_FREE(salt.data);
 154
 155         return ret;
 156 }
 157 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 158 /* Heimdal */
 159 int create_kerberos_key_from_string_direct(krb5_context context,
 160                                                   krb5_principal host_princ,
 161                                                   krb5_data *password,
 162                                                   krb5_keyblock *key,
 163                                                   krb5_enctype enctype)
 164 {
 165         int ret;
 166         krb5_salt salt;
 167
 168         ret = krb5_get_pw_salt(context, host_princ, &salt);
 169         if (ret) {
 170                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 171                 return ret;
 172         }
 173
 174         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 175         krb5_free_salt(context, salt);
 176
 177         return ret;
 178 }
 179 #else
 180 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 181 #endif
 182
 183 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 184  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 185                                             krb5_enctype **enctypes)
 186 {
 187         return krb5_get_permitted_enctypes(context, enctypes);
 188 }
 189 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 190  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 191                                             krb5_enctype **enctypes)
 192 {
 193 #ifdef HAVE_KRB5_PDU_NONE_DECL
 194         return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
 195 #else
 196         return krb5_get_default_in_tkt_etypes(context, enctypes);
 197 #endif
 198 }
 199 #else
 200 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 201 #endif
 202
 203 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 204  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 205                                         krb5_auth_context auth_context,
 206                                         krb5_keyblock *keyblock)
 207 {
 208         return krb5_auth_con_setkey(context, auth_context, keyblock);
 209 }
 210 #endif
 211
 212 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 213                            DATA_BLOB *edata,
 214                            DATA_BLOB *edata_out)
 215 {
 216         DATA_BLOB edata_contents;
 217         ASN1_DATA *data;
 218         int edata_type;
 219
 220         if (!edata->length) {
 221                 return false;
 222         }
 223
 224         data = asn1_init(mem_ctx);
 225         if (data == NULL) {
 226                 return false;
 227         }
 228
 229         asn1_load(data, *edata);
 230         asn1_start_tag(data, ASN1_SEQUENCE(0));
 231         asn1_start_tag(data, ASN1_CONTEXT(1));
 232         asn1_read_Integer(data, &edata_type);
 233
 234         if (edata_type != KRB5_PADATA_PW_SALT) {
 235                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 236                         KRB5_PADATA_PW_SALT, edata_type));
 237                 asn1_free(data);
 238                 return false;
 239         }
 240
 241         asn1_start_tag(data, ASN1_CONTEXT(2));
 242         asn1_read_OctetString(data, talloc_tos(), &edata_contents);
 243         asn1_end_tag(data);
 244         asn1_end_tag(data);
 245         asn1_end_tag(data);
 246         asn1_free(data);
 247
 248         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 249
 250         data_blob_free(&edata_contents);
 251
 252         return true;
 253 }
 254
 255
 256 static bool ads_cleanup_expired_creds(krb5_context context,
 257                                       krb5_ccache  ccache,
 258                                       krb5_creds  *credsp)
 259 {
 260         krb5_error_code retval;
 261         const char *cc_type = krb5_cc_get_type(context, ccache);
 262
 263         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 264                   cc_type, krb5_cc_get_name(context, ccache),
 265                   http_timestring(talloc_tos(), credsp->times.endtime)));
 266
 267         /* we will probably need new tickets if the current ones
 268            will expire within 10 seconds.
 269         */
 270         if (credsp->times.endtime >= (time(NULL) + 10))
 271                 return false;
 272
 273         /* heimdal won't remove creds from a file ccache, and
 274            perhaps we shouldn't anyway, since internally we
 275            use memory ccaches, and a FILE one probably means that
 276            we're using creds obtained outside of our exectuable
 277         */
 278         if (strequal(cc_type, "FILE")) {
 279                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 280                 return false;
 281         }
 282
 283         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 284         if (retval) {
 285                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 286                           error_message(retval)));
 287                 /* If we have an error in this, we want to display it,
 288                    but continue as though we deleted it */
 289         }
 290         return true;
 291 }
 292
 293 /* Allocate and setup the auth context into the state we need. */
 294
 295 static krb5_error_code setup_auth_context(krb5_context context,
 296                         krb5_auth_context *auth_context)
 297 {
 298         krb5_error_code retval;
 299
 300         retval = krb5_auth_con_init(context, auth_context );
 301         if (retval) {
 302                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 303                         error_message(retval)));
 304                 return retval;
 305         }
 306
 307         /* Ensure this is an addressless ticket. */
 308         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 309         if (retval) {
 310                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 311                         error_message(retval)));
 312         }
 313
 314         return retval;
 315 }
 316
 317 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 318 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 319                                                 uint32_t gss_flags)
 320 {
 321         unsigned int orig_length = in_data->length;
 322         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 323         char *gss_cksum = NULL;
 324
 325         if (orig_length) {
 326                 /* Extra length field for delgated ticket. */
 327                 base_cksum_size += 4;
 328         }
 329
 330         if ((unsigned int)base_cksum_size + orig_length <
 331                         (unsigned int)base_cksum_size) {
 332                 return EINVAL;
 333         }
 334
 335         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 336         if (gss_cksum == NULL) {
 337                 return ENOMEM;
 338         }
 339
 340         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 341         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 342
 343         /*
 344          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 345          * This matches the behavior of heimdal and mit.
 346          *
 347          * And it is needed to work against some closed source
 348          * SMB servers.
 349          *
 350          * See bug #7883
 351          */
 352         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 353
 354         SIVAL(gss_cksum, 20, gss_flags);
 355
 356         if (orig_length) {
 357                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 358                 SSVAL(gss_cksum, 26, orig_length);
 359                 /* Copy the kerberos KRB_CRED data */
 360                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 361                 free(in_data->data);
 362                 in_data->data = NULL;
 363                 in_data->length = 0;
 364         }
 365         in_data->data = gss_cksum;
 366         in_data->length = base_cksum_size + orig_length;
 367         return 0;
 368 }
 369 #endif
 370
 371 /**************************************************************
 372  krb5_parse_name that takes a UNIX charset.
 373 **************************************************************/
 374
 375 krb5_error_code smb_krb5_parse_name(krb5_context context,
 376                                 const char *name, /* in unix charset */
 377                                 krb5_principal *principal)
 378 {
 379         krb5_error_code ret;
 380         char *utf8_name;
 381         size_t converted_size;
 382         TALLOC_CTX *frame = talloc_stackframe();
 383
 384         if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
 385                 talloc_free(frame);
 386                 return ENOMEM;
 387         }
 388
 389         ret = krb5_parse_name(context, utf8_name, principal);
 390         TALLOC_FREE(frame);
 391         return ret;
 392 }
 393
 394 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 395 void krb5_free_unparsed_name(krb5_context context, char *val)
 396 {
 397         SAFE_FREE(val);
 398 }
 399 #endif
 400
 401 /**************************************************************
 402  krb5_parse_name that returns a UNIX charset name. Must
 403  be freed with talloc_free() call.
 404 **************************************************************/
 405
 406 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 407                                       krb5_context context,
 408                                       krb5_const_principal principal,
 409                                       char **unix_name)
 410 {
 411         krb5_error_code ret;
 412         char *utf8_name;
 413         size_t converted_size;
 414
 415         *unix_name = NULL;
 416         ret = krb5_unparse_name(context, principal, &utf8_name);
 417         if (ret) {
 418                 return ret;
 419         }
 420
 421         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 422                 krb5_free_unparsed_name(context, utf8_name);
 423                 return ENOMEM;
 424         }
 425         krb5_free_unparsed_name(context, utf8_name);
 426         return 0;
 427 }
 428
 429 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
 430                                             const char *name,
 431                                             krb5_principal *principal)
 432 {
 433         /* we are cheating here because parse_name will in fact set the realm.
 434          * We don't care as the only caller of smb_krb5_parse_name_norealm
 435          * ignores the realm anyway when calling
 436          * smb_krb5_principal_compare_any_realm later - Guenther */
 437
 438         return smb_krb5_parse_name(context, name, principal);
 439 }
 440
 441 bool smb_krb5_principal_compare_any_realm(krb5_context context,
 442                                           krb5_const_principal princ1,
 443                                           krb5_const_principal princ2)
 444 {
 445         return krb5_principal_compare_any_realm(context, princ1, princ2);
 446 }
 447
 448 /*
 449   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 450 */
 451 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 452                                        krb5_auth_context *auth_context,
 453                                        const krb5_flags ap_req_options,
 454                                        const char *principal,
 455                                        krb5_ccache ccache,
 456                                        krb5_data *outbuf,
 457                                        time_t *expire_time,
 458                                        const char *impersonate_princ_s)
 459 {
 460         krb5_error_code           retval;
 461         krb5_principal    server;
 462         krb5_principal impersonate_princ = NULL;
 463         krb5_creds              * credsp;
 464         krb5_creds                creds;
 465         krb5_data in_data;
 466         bool creds_ready = false;
 467         int i = 0, maxtries = 3;
 468
 469         ZERO_STRUCT(in_data);
 470
 471         retval = smb_krb5_parse_name(context, principal, &server);
 472         if (retval) {
 473                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 474                 return retval;
 475         }
 476
 477         if (impersonate_princ_s) {
 478                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 479                                              &impersonate_princ);
 480                 if (retval) {
 481                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 482                         goto cleanup_princ;
 483                 }
 484         }
 485
 486         /* obtain ticket & session key */
 487         ZERO_STRUCT(creds);
 488         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 489                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 490                          error_message(retval)));
 491                 goto cleanup_princ;
 492         }
 493
 494         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 495                 /* This can commonly fail on smbd startup with no ticket in the cache.
 496                  * Report at higher level than 1. */
 497                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 498                          error_message(retval)));
 499                 goto cleanup_creds;
 500         }
 501
 502         while (!creds_ready && (i < maxtries)) {
 503
 504                 if ((retval = smb_krb5_get_credentials(context, ccache,
 505                                                        creds.client,
 506                                                        creds.server,
 507                                                        impersonate_princ,
 508                                                        &credsp))) {
 509                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 510                                 principal, error_message(retval)));
 511                         goto cleanup_creds;
 512                 }
 513
 514                 /* cope with ticket being in the future due to clock skew */
 515                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 516                         time_t t = time(NULL);
 517                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 518                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 519                         krb5_set_real_time(context, t + time_offset + 1, 0);
 520                 }
 521
 522                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 523                         creds_ready = true;
 524                 }
 525
 526                 i++;
 527         }
 528
 529         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 530                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 531                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 532                   (unsigned)credsp->times.endtime));
 533
 534         if (expire_time) {
 535                 *expire_time = (time_t)credsp->times.endtime;
 536         }
 537
 538         /* Allocate the auth_context. */
 539         retval = setup_auth_context(context, auth_context);
 540         if (retval) {
 541                 DEBUG(1,("setup_auth_context failed (%s)\n",
 542                         error_message(retval)));
 543                 goto cleanup_creds;
 544         }
 545
 546 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 547         {
 548                 uint32_t gss_flags = 0;
 549
 550                 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 551                         /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 552                          as part of the kerberos exchange. */
 553
 554                         DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 555
 556                         retval = krb5_auth_con_setuseruserkey(context,
 557                                         *auth_context,
 558                                         &credsp->keyblock );
 559                         if (retval) {
 560                                 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 561                                         error_message(retval)));
 562                                 goto cleanup_creds;
 563                         }
 564
 565                         /* Must use a subkey for forwarded tickets. */
 566                         retval = krb5_auth_con_setflags(context,
 567                                 *auth_context,
 568                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 569                         if (retval) {
 570                                 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 571                                         error_message(retval)));
 572                                 goto cleanup_creds;
 573                         }
 574
 575                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 576                                 *auth_context,  /* Authentication context [in] */
 577                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 578                                 credsp->client, /* Client principal for the tgt [in] */
 579                                 credsp->server, /* Server principal for the tgt [in] */
 580                                 ccache,         /* Credential cache to use for storage [in] */
 581                                 1,              /* Turn on for "Forwardable ticket" [in] */
 582                                 &in_data );     /* Resulting response [out] */
 583
 584                         if (retval) {
 585                                 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 586                                            error_message( retval ) ) );
 587
 588                                 /*
 589                                  * This is not fatal. Delete the *auth_context and continue
 590                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
 591                                  */
 592
 593                                 if (in_data.data) {
 594                                         free( in_data.data );
 595                                         in_data.data = NULL;
 596                                         in_data.length = 0;
 597                                 }
 598                                 krb5_auth_con_free(context, *auth_context);
 599                                 *auth_context = NULL;
 600                                 retval = setup_auth_context(context, auth_context);
 601                                 if (retval) {
 602                                         DEBUG(1,("setup_auth_context failed (%s)\n",
 603                                                 error_message(retval)));
 604                                         goto cleanup_creds;
 605                                 }
 606                         } else {
 607                                 /* We got a delegated ticket. */
 608                                 gss_flags |= GSS_C_DELEG_FLAG;
 609                         }
 610                 }
 611
 612                 /* Frees and reallocates in_data into a GSS checksum blob. */
 613                 retval = create_gss_checksum(&in_data, gss_flags);
 614                 if (retval) {
 615                         goto cleanup_data;
 616                 }
 617
 618                 /* We always want GSS-checksum types. */
 619                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 620                 if (retval) {
 621                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 622                                 error_message(retval)));
 623                         goto cleanup_data;
 624                 }
 625         }
 626 #endif
 627
 628         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 629                                       &in_data, credsp, outbuf);
 630         if (retval) {
 631                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 632                          error_message(retval)));
 633         }
 634
 635 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 636 cleanup_data:
 637 #endif
 638
 639         if (in_data.data) {
 640                 free( in_data.data );
 641                 in_data.length = 0;
 642         }
 643
 644         krb5_free_creds(context, credsp);
 645
 646 cleanup_creds:
 647         krb5_free_cred_contents(context, &creds);
 648
 649 cleanup_princ:
 650         krb5_free_principal(context, server);
 651         if (impersonate_princ) {
 652                 krb5_free_principal(context, impersonate_princ);
 653         }
 654
 655         return retval;
 656 }
 657
 658 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 659 {
 660 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 661         if (pdata->data) {
 662                 krb5_free_data_contents(context, pdata);
 663         }
 664 #elif defined(HAVE_KRB5_DATA_FREE)
 665         krb5_data_free(context, pdata);
 666 #else
 667         SAFE_FREE(pdata->data);
 668 #endif
 669 }
 670
 671 /*
 672   get a kerberos5 ticket for the given service
 673 */
 674 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 675                         const char *principal, time_t time_offset,
 676                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 677                         uint32_t extra_ap_opts, const char *ccname,
 678                         time_t *tgs_expire,
 679                         const char *impersonate_princ_s)
 680
 681 {
 682         krb5_error_code retval;
 683         krb5_data packet;
 684         krb5_context context = NULL;
 685         krb5_ccache ccdef = NULL;
 686         krb5_auth_context auth_context = NULL;
 687         krb5_enctype enc_types[] = {
 688                 ENCTYPE_ARCFOUR_HMAC,
 689                 ENCTYPE_DES_CBC_MD5,
 690                 ENCTYPE_DES_CBC_CRC,
 691                 ENCTYPE_NULL};
 692
 693         initialize_krb5_error_table();
 694         retval = krb5_init_context(&context);
 695         if (retval) {
 696                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 697                          error_message(retval)));
 698                 goto failed;
 699         }
 700
 701         if (time_offset != 0) {
 702                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 703         }
 704
 705         if ((retval = krb5_cc_resolve(context, ccname ?
 706                         ccname : krb5_cc_default_name(context), &ccdef))) {
 707                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 708                          error_message(retval)));
 709                 goto failed;
 710         }
 711
 712         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 713                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 714                          error_message(retval)));
 715                 goto failed;
 716         }
 717
 718         retval = ads_krb5_mk_req(context, &auth_context,
 719                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 720                                 principal, ccdef, &packet,
 721                                 tgs_expire, impersonate_princ_s);
 722         if (retval) {
 723                 goto failed;
 724         }
 725
 726         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 727                                  session_key_krb5, false);
 728
 729         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 730
 731         kerberos_free_data_contents(context, &packet);
 732
 733 failed:
 734
 735         if (context) {
 736                 if (ccdef)
 737                         krb5_cc_close(context, ccdef);
 738                 if (auth_context)
 739                         krb5_auth_con_free(context, auth_context);
 740                 krb5_free_context(context);
 741         }
 742
 743         return retval;
 744 }
 745
 746 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 747                               krb5_context context,
 748                               krb5_auth_context auth_context,
 749                               DATA_BLOB *session_key, bool remote)
 750 {
 751         krb5_keyblock *skey = NULL;
 752         krb5_error_code err = 0;
 753         bool ret = false;
 754
 755         if (remote) {
 756                 err = krb5_auth_con_getremotesubkey(context,
 757                                                     auth_context, &skey);
 758         } else {
 759                 err = krb5_auth_con_getlocalsubkey(context,
 760                                                    auth_context, &skey);
 761         }
 762
 763         if (err || skey == NULL) {
 764                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 765                 goto done;
 766         }
 767
 768         DEBUG(10, ("Got KRB5 session key of length %d\n",
 769                    (int)KRB5_KEY_LENGTH(skey)));
 770
 771         *session_key = data_blob_talloc(mem_ctx,
 772                                          KRB5_KEY_DATA(skey),
 773                                          KRB5_KEY_LENGTH(skey));
 774         dump_data_pw("KRB5 Session Key:\n",
 775                      session_key->data,
 776                      session_key->length);
 777
 778         ret = true;
 779
 780 done:
 781         if (skey) {
 782                 krb5_free_keyblock(context, skey);
 783         }
 784
 785         return ret;
 786 }
 787
 788
 789 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 790  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 791
 792  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 793 {
 794         static krb5_data kdata;
 795
 796         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 797         kdata.length = strlen((const char *)kdata.data);
 798         return &kdata;
 799 }
 800 #endif
 801
 802 /* Prototypes */
 803
 804  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
 805                                        const char *client_string,       /* gd@BER.SUSE.DE */
 806                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
 807                                        time_t *expire_time)
 808 {
 809         krb5_error_code ret;
 810         krb5_context context = NULL;
 811         krb5_ccache ccache = NULL;
 812         krb5_principal client = NULL;
 813         krb5_creds creds, creds_in, *creds_out = NULL;
 814
 815         ZERO_STRUCT(creds);
 816         ZERO_STRUCT(creds_in);
 817
 818         initialize_krb5_error_table();
 819         ret = krb5_init_context(&context);
 820         if (ret) {
 821                 goto done;
 822         }
 823
 824         if (!ccache_string) {
 825                 ccache_string = krb5_cc_default_name(context);
 826         }
 827
 828         if (!ccache_string) {
 829                 ret = EINVAL;
 830                 goto done;
 831         }
 832
 833         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
 834
 835         /* FIXME: we should not fall back to defaults */
 836         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
 837         if (ret) {
 838                 goto done;
 839         }
 840
 841         if (client_string) {
 842                 ret = smb_krb5_parse_name(context, client_string, &client);
 843                 if (ret) {
 844                         goto done;
 845                 }
 846         } else {
 847                 ret = krb5_cc_get_principal(context, ccache, &client);
 848                 if (ret) {
 849                         goto done;
 850                 }
 851         }
 852
 853         ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
 854         if (ret) {
 855                 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
 856                 goto done;
 857         }
 858
 859         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
 860         ret = krb5_cc_initialize(context, ccache, client);
 861         if (ret) {
 862                 goto done;
 863         }
 864
 865         ret = krb5_cc_store_cred(context, ccache, &creds);
 866
 867         if (expire_time) {
 868                 *expire_time = (time_t) creds.times.endtime;
 869         }
 870
 871 done:
 872         krb5_free_cred_contents(context, &creds_in);
 873
 874         if (creds_out) {
 875                 krb5_free_creds(context, creds_out);
 876         } else {
 877                 krb5_free_cred_contents(context, &creds);
 878         }
 879
 880         if (client) {
 881                 krb5_free_principal(context, client);
 882         }
 883         if (ccache) {
 884                 krb5_cc_close(context, ccache);
 885         }
 886         if (context) {
 887                 krb5_free_context(context);
 888         }
 889
 890         return ret;
 891 }
 892
 893  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
 894 {
 895         krb5_error_code ret = 0;
 896         if (addr == NULL) {
 897                 return ret;
 898         }
 899 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 900         krb5_free_addresses(context, addr->addrs);
 901 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 902         ret = krb5_free_addresses(context, addr->addrs);
 903         SAFE_FREE(addr->addrs);
 904 #endif
 905         SAFE_FREE(addr);
 906         addr = NULL;
 907         return ret;
 908 }
 909
 910 #define MAX_NETBIOSNAME_LEN 16
 911  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
 912                                                    const char *netbios_name)
 913 {
 914         krb5_error_code ret = 0;
 915         char buf[MAX_NETBIOSNAME_LEN];
 916         int len;
 917 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 918         krb5_address **addrs = NULL;
 919 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 920         krb5_addresses *addrs = NULL;
 921 #endif
 922
 923         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
 924         if (*kerb_addr == NULL) {
 925                 return ENOMEM;
 926         }
 927
 928         /* temporarily duplicate put_name() code here to avoid dependency
 929          * issues for a 5 lines function */
 930         len = strlen(netbios_name);
 931         memcpy(buf, netbios_name,
 932                 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
 933         if (len < MAX_NETBIOSNAME_LEN - 1) {
 934                 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
 935         }
 936         buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
 937
 938 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
 939         {
 940                 int num_addr = 2;
 941
 942                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
 943                 if (addrs == NULL) {
 944                         SAFE_FREE(*kerb_addr);
 945                         return ENOMEM;
 946                 }
 947
 948                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
 949
 950                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
 951                 if (addrs[0] == NULL) {
 952                         SAFE_FREE(addrs);
 953                         SAFE_FREE(*kerb_addr);
 954                         return ENOMEM;
 955                 }
 956
 957                 addrs[0]->magic = KV5M_ADDRESS;
 958                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
 959                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
 960                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
 961                 if (addrs[0]->contents == NULL) {
 962                         SAFE_FREE(addrs[0]);
 963                         SAFE_FREE(addrs);
 964                         SAFE_FREE(*kerb_addr);
 965                         return ENOMEM;
 966                 }
 967
 968                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
 969
 970                 addrs[1] = NULL;
 971         }
 972 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
 973         {
 974                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
 975                 if (addrs == NULL) {
 976                         SAFE_FREE(*kerb_addr);
 977                         return ENOMEM;
 978                 }
 979
 980                 memset(addrs, 0, sizeof(krb5_addresses));
 981
 982                 addrs->len = 1;
 983                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
 984                 if (addrs->val == NULL) {
 985                         SAFE_FREE(addrs);
 986                         SAFE_FREE(kerb_addr);
 987                         return ENOMEM;
 988                 }
 989
 990                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
 991                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
 992                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
 993                 if (addrs->val[0].address.data == NULL) {
 994                         SAFE_FREE(addrs->val);
 995                         SAFE_FREE(addrs);
 996                         SAFE_FREE(*kerb_addr);
 997                         return ENOMEM;
 998                 }
 999
1000                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1001         }
1002 #else
1003 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1004 #endif
1005         (*kerb_addr)->addrs = addrs;
1006
1007         return ret;
1008 }
1009
1010  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1011 {
1012 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1013         krb5_free_error_contents(context, krberror);
1014 #else /* MIT */
1015         krb5_free_error(context, krberror);
1016 #endif
1017 }
1018
1019  krb5_error_code handle_krberror_packet(krb5_context context,
1020                                         krb5_data *packet)
1021 {
1022         krb5_error_code ret;
1023         bool got_error_code = false;
1024
1025         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1026
1027 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1028         {
1029                 krb5_error krberror;
1030
1031                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1032                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1033                                 error_message(ret)));
1034                         return ret;
1035                 }
1036
1037                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1038                         ret = (krb5_error_code) krberror.error_code;
1039                         got_error_code = true;
1040                 }
1041
1042                 smb_krb5_free_error(context, &krberror);
1043         }
1044 #else /* MIT */
1045         {
1046                 krb5_error *krberror;
1047
1048                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1049                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1050                                 error_message(ret)));
1051                         return ret;
1052                 }
1053
1054                 if (krberror->e_data.data == NULL) {
1055 #if defined(ERROR_TABLE_BASE_krb5)
1056                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1057 #else
1058                         ret = (krb5_error_code)krberror->error;
1059 #endif
1060                         got_error_code = true;
1061                 }
1062                 smb_krb5_free_error(context, krberror);
1063         }
1064 #endif
1065         if (got_error_code) {
1066                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1067                         error_message(ret), ret));
1068         }
1069         return ret;
1070 }
1071
1072 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1073                                             krb5_get_init_creds_opt **opt)
1074 {
1075         /* Heimdal or modern MIT version */
1076         return krb5_get_init_creds_opt_alloc(context, opt);
1077 }
1078
1079 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1080                                 krb5_get_init_creds_opt *opt)
1081 {
1082         /* Modern MIT or Heimdal version */
1083         krb5_get_init_creds_opt_free(context, opt);
1084 }
1085
1086 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1087 {
1088         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1089 }
1090
1091 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1092                                         krb5_keytab_entry *kt_entry)
1093 {
1094 /* Try krb5_free_keytab_entry_contents first, since
1095  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1096  * krb5_kt_free_entry but only has a prototype for the first, while the
1097  * second is considered private.
1098  */
1099 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1100         return krb5_free_keytab_entry_contents(context, kt_entry);
1101 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1102         return krb5_kt_free_entry(context, kt_entry);
1103 #else
1104 #error UNKNOWN_KT_FREE_FUNCTION
1105 #endif
1106 }
1107
1108
1109 /* caller needs to free etype_s */
1110 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1111                                            krb5_enctype enctype,
1112                                            char **etype_s)
1113 {
1114 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1115         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1116 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1117         char buf[256];
1118         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1119         if (ret) {
1120                 return ret;
1121         }
1122         *etype_s = SMB_STRDUP(buf);
1123         if (!*etype_s) {
1124                 return ENOMEM;
1125         }
1126         return ret;
1127 #else
1128 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1129 #endif
1130 }
1131
1132 /**********************************************************************
1133  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1134  * allows to process non-default keytab names.
1135  * @param context krb5_context
1136  * @param keytab_name_req string
1137  * @param write_access bool if writable keytab is required
1138  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1139  * @return krb5_error_code
1140 **********************************************************************/
1141
1142 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1143 #ifndef MAX_KEYTAB_NAME_LEN
1144 #define MAX_KEYTAB_NAME_LEN 1100
1145 #endif
1146
1147 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1148                                      const char *keytab_name_req,
1149                                      bool write_access,
1150                                      krb5_keytab *keytab)
1151 {
1152         krb5_error_code ret = 0;
1153         TALLOC_CTX *mem_ctx;
1154         char keytab_string[MAX_KEYTAB_NAME_LEN];
1155         char *kt_str = NULL;
1156         bool found_valid_name = false;
1157         const char *pragma = "FILE";
1158         const char *tmp = NULL;
1159
1160         if (!write_access && !keytab_name_req) {
1161                 /* caller just wants to read the default keytab readonly, so be it */
1162                 return krb5_kt_default(context, keytab);
1163         }
1164
1165         mem_ctx = talloc_init("smb_krb5_open_keytab");
1166         if (!mem_ctx) {
1167                 return ENOMEM;
1168         }
1169
1170 #ifdef HAVE_WRFILE_KEYTAB
1171         if (write_access) {
1172                 pragma = "WRFILE";
1173         }
1174 #endif
1175
1176         if (keytab_name_req) {
1177
1178                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1179                         ret = KRB5_CONFIG_NOTENUFSPACE;
1180                         goto out;
1181                 }
1182
1183                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1184                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1185                         tmp = keytab_name_req;
1186                         goto resolve;
1187                 }
1188
1189                 if (keytab_name_req[0] != '/') {
1190                         ret = KRB5_KT_BADNAME;
1191                         goto out;
1192                 }
1193
1194                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1195                 if (!tmp) {
1196                         ret = ENOMEM;
1197                         goto out;
1198                 }
1199
1200                 goto resolve;
1201         }
1202
1203         /* we need to handle more complex keytab_strings, like:
1204          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1205
1206         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1207         if (ret) {
1208                 goto out;
1209         }
1210
1211         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1212
1213         tmp = talloc_strdup(mem_ctx, keytab_string);
1214         if (!tmp) {
1215                 ret = ENOMEM;
1216                 goto out;
1217         }
1218
1219         if (strncmp(tmp, "ANY:", 4) == 0) {
1220                 tmp += 4;
1221         }
1222
1223         memset(&keytab_string, '\0', sizeof(keytab_string));
1224
1225         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1226                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1227                         found_valid_name = true;
1228                         tmp = kt_str;
1229                         tmp += 7;
1230                 }
1231
1232                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1233                         found_valid_name = true;
1234                         tmp = kt_str;
1235                         tmp += 5;
1236                 }
1237
1238                 if (tmp[0] == '/') {
1239                         /* Treat as a FILE: keytab definition. */
1240                         found_valid_name = true;
1241                 }
1242
1243                 if (found_valid_name) {
1244                         if (tmp[0] != '/') {
1245                                 ret = KRB5_KT_BADNAME;
1246                                 goto out;
1247                         }
1248
1249                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1250                         if (!tmp) {
1251                                 ret = ENOMEM;
1252                                 goto out;
1253                         }
1254                         break;
1255                 }
1256         }
1257
1258         if (!found_valid_name) {
1259                 ret = KRB5_KT_UNKNOWN_TYPE;
1260                 goto out;
1261         }
1262
1263  resolve:
1264         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1265         ret = krb5_kt_resolve(context, tmp, keytab);
1266
1267  out:
1268         TALLOC_FREE(mem_ctx);
1269         return ret;
1270 }
1271
1272 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1273                                      krb5_context context,
1274                                      krb5_keytab keytab,
1275                                      const char **keytab_name)
1276 {
1277         char keytab_string[MAX_KEYTAB_NAME_LEN];
1278         krb5_error_code ret = 0;
1279
1280         ret = krb5_kt_get_name(context, keytab,
1281                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1282         if (ret) {
1283                 return ret;
1284         }
1285
1286         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1287         if (!*keytab_name) {
1288                 return ENOMEM;
1289         }
1290
1291         return ret;
1292 }
1293
1294 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1295     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1296     defined(HAVE_KRB5_GET_CREDS)
1297 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1298                                                              krb5_ccache ccache,
1299                                                              krb5_principal me,
1300                                                              krb5_principal server,
1301                                                              krb5_principal impersonate_princ,
1302                                                              krb5_creds **out_creds)
1303 {
1304         krb5_error_code ret;
1305         krb5_get_creds_opt opt;
1306
1307         ret = krb5_get_creds_opt_alloc(context, &opt);
1308         if (ret) {
1309                 goto done;
1310         }
1311         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1312
1313         if (impersonate_princ) {
1314                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1315                                                          impersonate_princ);
1316                 if (ret) {
1317                         goto done;
1318                 }
1319         }
1320
1321         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1322         if (ret) {
1323                 goto done;
1324         }
1325
1326  done:
1327         if (opt) {
1328                 krb5_get_creds_opt_free(context, opt);
1329         }
1330         return ret;
1331 }
1332 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1333
1334 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1335 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1336                                                          krb5_ccache ccache,
1337                                                          krb5_principal me,
1338                                                          krb5_principal server,
1339                                                          krb5_principal impersonate_princ,
1340                                                          krb5_creds **out_creds)
1341 {
1342         krb5_error_code ret;
1343         krb5_creds in_creds;
1344
1345 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1346 krb5_error_code KRB5_CALLCONV
1347 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1348                               krb5_ccache ccache, krb5_creds *in_creds,
1349                               krb5_data *subject_cert,
1350                               krb5_creds **out_creds);
1351 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1352
1353         ZERO_STRUCT(in_creds);
1354
1355         if (impersonate_princ) {
1356
1357                 in_creds.server = me;
1358                 in_creds.client = impersonate_princ;
1359
1360                 ret = krb5_get_credentials_for_user(context,
1361                                                     0, /* krb5_flags options */
1362                                                     ccache,
1363                                                     &in_creds,
1364                                                     NULL, /* krb5_data *subject_cert */
1365                                                     out_creds);
1366         } else {
1367                 in_creds.client = me;
1368                 in_creds.server = server;
1369
1370                 ret = krb5_get_credentials(context, 0, ccache,
1371                                            &in_creds, out_creds);
1372         }
1373
1374         return ret;
1375 }
1376 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1377
1378 /*
1379  * smb_krb5_get_credentials
1380  *
1381  * @brief Get krb5 credentials for a server
1382  *
1383  * @param[in] context           An initialized krb5_context
1384  * @param[in] ccache            An initialized krb5_ccache
1385  * @param[in] me                The krb5_principal of the caller
1386  * @param[in] server            The krb5_principal of the requested service
1387  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1388  * @param[out] out_creds        The returned krb5_creds structure
1389  * @return krb5_error_code
1390  *
1391  */
1392 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1393                                          krb5_ccache ccache,
1394                                          krb5_principal me,
1395                                          krb5_principal server,
1396                                          krb5_principal impersonate_princ,
1397                                          krb5_creds **out_creds)
1398 {
1399         krb5_error_code ret;
1400         krb5_creds *creds = NULL;
1401
1402         *out_creds = NULL;
1403
1404         if (impersonate_princ) {
1405 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1406                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1407 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1408                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1409 #else
1410                 ret = ENOTSUP;
1411 #endif
1412         } else {
1413                 krb5_creds in_creds;
1414
1415                 ZERO_STRUCT(in_creds);
1416
1417                 in_creds.client = me;
1418                 in_creds.server = server;
1419
1420                 ret = krb5_get_credentials(context, 0, ccache,
1421                                            &in_creds, &creds);
1422         }
1423         if (ret) {
1424                 goto done;
1425         }
1426
1427         if (out_creds) {
1428                 *out_creds = creds;
1429         }
1430
1431  done:
1432         if (creds && ret) {
1433                 krb5_free_creds(context, creds);
1434         }
1435
1436         return ret;
1437 }
1438
1439 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1440                                                 krb5_enctype enctype,
1441                                                 const void *data,
1442                                                 size_t length,
1443                                                 krb5_keyblock *key)
1444 {
1445 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1446         return krb5_keyblock_init(context, enctype, data, length, key);
1447 #else
1448         memset(key, 0, sizeof(krb5_keyblock));
1449         KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1450         if (NULL == KRB5_KEY_DATA(key)) {
1451                 return ENOMEM;
1452         }
1453         memcpy(KRB5_KEY_DATA(key), data, length);
1454         KRB5_KEY_LENGTH(key) = length;
1455         KRB5_KEY_TYPE(key) = enctype;
1456         return 0;
1457 #endif
1458 }
1459
1460 /*
1461   simulate a kinit, putting the tgt in the given credentials cache.
1462   Orignally by remus@snapserver.com
1463
1464   This version is built to use a keyblock, rather than needing the
1465   original password.
1466
1467   The impersonate_principal is the principal if NULL, or the principal
1468   to impersonate
1469
1470   The target_service defaults to the krbtgt if NULL, but could be
1471    kpasswd/realm or the local service (if we are doing s4u2self)
1472 */
1473 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1474                                            krb5_principal principal,
1475                                            krb5_keyblock *keyblock,
1476                                            const char *target_service,
1477                                            krb5_get_init_creds_opt *krb_options,
1478                                            time_t *expire_time,
1479                                            time_t *kdc_time)
1480 {
1481         krb5_error_code code = 0;
1482         krb5_creds my_creds;
1483
1484 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1485         code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1486                                             keyblock, 0, target_service,
1487                                             krb_options);
1488 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1489 {
1490 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1491         char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1492         krb5_keytab_entry entry;
1493         krb5_keytab keytab;
1494
1495         memset(&entry, 0, sizeof(entry));
1496         entry.principal = principal;
1497         *(KRB5_KT_KEY(&entry)) = *keyblock;
1498
1499         memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1500         mktemp(tmp_name);
1501         if (tmp_name[0] == 0) {
1502                 return KRB5_KT_BADNAME;
1503         }
1504         code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1505         if (code) {
1506                 return code;
1507         }
1508
1509         code = krb5_kt_add_entry(ctx, keytab, &entry);
1510         if (code) {
1511                 (void)krb5_kt_close(ctx, keytab);
1512                 goto done;
1513         }
1514
1515         code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1516                                           keytab, 0, target_service,
1517                                           krb_options);
1518         (void)krb5_kt_close(ctx, keytab);
1519 }
1520 #else
1521 #error krb5_get_init_creds_keyblock not available!
1522 #endif
1523         if (code) {
1524                 return code;
1525         }
1526
1527         code = krb5_cc_initialize(ctx, cc, principal);
1528         if (code) {
1529                 goto done;
1530         }
1531
1532         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1533         if (code) {
1534                 goto done;
1535         }
1536
1537         if (expire_time) {
1538                 *expire_time = (time_t) my_creds.times.endtime;
1539         }
1540
1541         if (kdc_time) {
1542                 *kdc_time = (time_t) my_creds.times.starttime;
1543         }
1544
1545         code = 0;
1546 done:
1547         krb5_free_cred_contents(ctx, &my_creds);
1548         return code;
1549 }
1550
1551 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
1552                                            krb5_principal principal,
1553                                            const char *password,
1554                                            const char *target_service,
1555                                            krb5_get_init_creds_opt *krb_options,
1556                                            time_t *expire_time,
1557                                            time_t *kdc_time)
1558 {
1559         krb5_error_code code = 0;
1560         krb5_creds my_creds;
1561
1562         code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1563                                             password, NULL, NULL, 0,
1564                                             target_service, krb_options);
1565         if (code) {
1566                 return code;
1567         }
1568
1569         code = krb5_cc_initialize(ctx, cc, principal);
1570         if (code) {
1571                 goto done;
1572         }
1573
1574         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1575         if (code) {
1576                 goto done;
1577         }
1578
1579         if (expire_time) {
1580                 *expire_time = (time_t) my_creds.times.endtime;
1581         }
1582
1583         if (kdc_time) {
1584                 *kdc_time = (time_t) my_creds.times.starttime;
1585         }
1586
1587         code = 0;
1588 done:
1589         krb5_free_cred_contents(ctx, &my_creds);
1590         return code;
1591 }
1592
1593 #ifdef SAMBA4_USES_HEIMDAL
1594 /*
1595   simulate a kinit, putting the tgt in the given credentials cache.
1596   Orignally by remus@snapserver.com
1597
1598   The impersonate_principal is the principal
1599
1600   The self_service, should be the local service (for S4U2Self if
1601   impersonate_principal is given).
1602
1603   The target_service defaults to the krbtgt if NULL, but could be
1604   kpasswd/realm or a remote service (for S4U2Proxy)
1605
1606 */
1607 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
1608                                         krb5_ccache store_cc,
1609                                         krb5_principal init_principal,
1610                                         const char *init_password,
1611                                         krb5_principal impersonate_principal,
1612                                         const char *self_service,
1613                                         const char *target_service,
1614                                         krb5_get_init_creds_opt *krb_options,
1615                                         time_t *expire_time,
1616                                         time_t *kdc_time)
1617 {
1618         krb5_error_code code = 0;
1619         krb5_get_creds_opt options;
1620         krb5_principal store_principal;
1621         krb5_creds store_creds;
1622         krb5_creds *s4u2self_creds;
1623         Ticket s4u2self_ticket;
1624         size_t s4u2self_ticketlen;
1625         krb5_creds *s4u2proxy_creds;
1626         krb5_principal self_princ;
1627         bool s4u2proxy;
1628         krb5_principal target_princ;
1629         krb5_ccache tmp_cc;
1630         const char *self_realm;
1631         krb5_principal blacklist_principal = NULL;
1632         krb5_principal whitelist_principal = NULL;
1633
1634         code = krb5_get_init_creds_password(ctx, &store_creds,
1635                                             init_principal,
1636                                             init_password,
1637                                             NULL, NULL,
1638                                             0,
1639                                             NULL,
1640                                             krb_options);
1641         if (code != 0) {
1642                 return code;
1643         }
1644
1645         store_principal = init_principal;
1646
1647         /*
1648          * We are trying S4U2Self now:
1649          *
1650          * As we do not want to expose our TGT in the
1651          * krb5_ccache, which is also holds the impersonated creds.
1652          *
1653          * Some low level krb5/gssapi function might use the TGT
1654          * identity and let the client act as our machine account.
1655          *
1656          * We need to avoid that and use a temporary krb5_ccache
1657          * in order to pass our TGT to the krb5_get_creds() function.
1658          */
1659         code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1660         if (code != 0) {
1661                 krb5_free_cred_contents(ctx, &store_creds);
1662                 return code;
1663         }
1664
1665         code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1666         if (code != 0) {
1667                 krb5_cc_destroy(ctx, tmp_cc);
1668                 krb5_free_cred_contents(ctx, &store_creds);
1669                 return code;
1670         }
1671
1672         code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1673         if (code != 0) {
1674                 krb5_free_cred_contents(ctx, &store_creds);
1675                 krb5_cc_destroy(ctx, tmp_cc);
1676                 return code;
1677         }
1678
1679         /*
1680          * we need to remember the client principal of our
1681          * TGT and make sure the KDC does not return this
1682          * in the impersonated tickets. This can happen
1683          * if the KDC does not support S4U2Self and S4U2Proxy.
1684          */
1685         blacklist_principal = store_creds.client;
1686         store_creds.client = NULL;
1687         krb5_free_cred_contents(ctx, &store_creds);
1688
1689         /*
1690          * Check if we also need S4U2Proxy or if S4U2Self is
1691          * enough in order to get a ticket for the target.
1692          */
1693         if (target_service == NULL) {
1694                 s4u2proxy = false;
1695         } else if (strcmp(target_service, self_service) == 0) {
1696                 s4u2proxy = false;
1697         } else {
1698                 s4u2proxy = true;
1699         }
1700
1701         /*
1702          * For S4U2Self we need our own service principal,
1703          * which belongs to our own realm (available on
1704          * our client principal).
1705          */
1706         self_realm = krb5_principal_get_realm(ctx, init_principal);
1707
1708         code = krb5_parse_name(ctx, self_service, &self_princ);
1709         if (code != 0) {
1710                 krb5_free_principal(ctx, blacklist_principal);
1711                 krb5_cc_destroy(ctx, tmp_cc);
1712                 return code;
1713         }
1714
1715         code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1716         if (code != 0) {
1717                 krb5_free_principal(ctx, blacklist_principal);
1718                 krb5_free_principal(ctx, self_princ);
1719                 krb5_cc_destroy(ctx, tmp_cc);
1720                 return code;
1721         }
1722
1723         code = krb5_get_creds_opt_alloc(ctx, &options);
1724         if (code != 0) {
1725                 krb5_free_principal(ctx, blacklist_principal);
1726                 krb5_free_principal(ctx, self_princ);
1727                 krb5_cc_destroy(ctx, tmp_cc);
1728                 return code;
1729         }
1730
1731         if (s4u2proxy) {
1732                 /*
1733                  * If we want S4U2Proxy, we need the forwardable flag
1734                  * on the S4U2Self ticket.
1735                  */
1736                 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1737         }
1738
1739         code = krb5_get_creds_opt_set_impersonate(ctx, options,
1740                                                   impersonate_principal);
1741         if (code != 0) {
1742                 krb5_get_creds_opt_free(ctx, options);
1743                 krb5_free_principal(ctx, blacklist_principal);
1744                 krb5_free_principal(ctx, self_princ);
1745                 krb5_cc_destroy(ctx, tmp_cc);
1746                 return code;
1747         }
1748
1749         code = krb5_get_creds(ctx, options, tmp_cc,
1750                               self_princ, &s4u2self_creds);
1751         krb5_get_creds_opt_free(ctx, options);
1752         krb5_free_principal(ctx, self_princ);
1753         if (code != 0) {
1754                 krb5_free_principal(ctx, blacklist_principal);
1755                 krb5_cc_destroy(ctx, tmp_cc);
1756                 return code;
1757         }
1758
1759         if (!s4u2proxy) {
1760                 krb5_cc_destroy(ctx, tmp_cc);
1761
1762                 /*
1763                  * Now make sure we store the impersonated principal
1764                  * and creds instead of the TGT related stuff
1765                  * in the krb5_ccache of the caller.
1766                  */
1767                 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1768                                                 &store_creds);
1769                 krb5_free_creds(ctx, s4u2self_creds);
1770                 if (code != 0) {
1771                         return code;
1772                 }
1773
1774                 /*
1775                  * It's important to store the principal the KDC
1776                  * returned, as otherwise the caller would not find
1777                  * the S4U2Self ticket in the krb5_ccache lookup.
1778                  */
1779                 store_principal = store_creds.client;
1780                 goto store;
1781         }
1782
1783         /*
1784          * We are trying S4U2Proxy:
1785          *
1786          * We need the ticket from the S4U2Self step
1787          * and our TGT in order to get the delegated ticket.
1788          */
1789         code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1790                              s4u2self_creds->ticket.length,
1791                              &s4u2self_ticket,
1792                              &s4u2self_ticketlen);
1793         if (code != 0) {
1794                 krb5_free_creds(ctx, s4u2self_creds);
1795                 krb5_free_principal(ctx, blacklist_principal);
1796                 krb5_cc_destroy(ctx, tmp_cc);
1797                 return code;
1798         }
1799
1800         /*
1801          * we need to remember the client principal of the
1802          * S4U2Self stage and as it needs to match the one we
1803          * will get for the S4U2Proxy stage. We need this
1804          * in order to detect KDCs which does not support S4U2Proxy.
1805          */
1806         whitelist_principal = s4u2self_creds->client;
1807         s4u2self_creds->client = NULL;
1808         krb5_free_creds(ctx, s4u2self_creds);
1809
1810         /*
1811          * For S4U2Proxy we also got a target service principal,
1812          * which also belongs to our own realm (available on
1813          * our client principal).
1814          */
1815         code = krb5_parse_name(ctx, target_service, &target_princ);
1816         if (code != 0) {
1817                 free_Ticket(&s4u2self_ticket);
1818                 krb5_free_principal(ctx, whitelist_principal);
1819                 krb5_free_principal(ctx, blacklist_principal);
1820                 krb5_cc_destroy(ctx, tmp_cc);
1821                 return code;
1822         }
1823
1824         code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1825         if (code != 0) {
1826                 free_Ticket(&s4u2self_ticket);
1827                 krb5_free_principal(ctx, target_princ);
1828                 krb5_free_principal(ctx, whitelist_principal);
1829                 krb5_free_principal(ctx, blacklist_principal);
1830                 krb5_cc_destroy(ctx, tmp_cc);
1831                 return code;
1832         }
1833
1834         code = krb5_get_creds_opt_alloc(ctx, &options);
1835         if (code != 0) {
1836                 free_Ticket(&s4u2self_ticket);
1837                 krb5_free_principal(ctx, target_princ);
1838                 krb5_free_principal(ctx, whitelist_principal);
1839                 krb5_free_principal(ctx, blacklist_principal);
1840                 krb5_cc_destroy(ctx, tmp_cc);
1841                 return code;
1842         }
1843
1844         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1845         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1846
1847         code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1848         free_Ticket(&s4u2self_ticket);
1849         if (code != 0) {
1850                 krb5_get_creds_opt_free(ctx, options);
1851                 krb5_free_principal(ctx, target_princ);
1852                 krb5_free_principal(ctx, whitelist_principal);
1853                 krb5_free_principal(ctx, blacklist_principal);
1854                 krb5_cc_destroy(ctx, tmp_cc);
1855                 return code;
1856         }
1857
1858         code = krb5_get_creds(ctx, options, tmp_cc,
1859                               target_princ, &s4u2proxy_creds);
1860         krb5_get_creds_opt_free(ctx, options);
1861         krb5_free_principal(ctx, target_princ);
1862         krb5_cc_destroy(ctx, tmp_cc);
1863         if (code != 0) {
1864                 krb5_free_principal(ctx, whitelist_principal);
1865                 krb5_free_principal(ctx, blacklist_principal);
1866                 return code;
1867         }
1868
1869         /*
1870          * Now make sure we store the impersonated principal
1871          * and creds instead of the TGT related stuff
1872          * in the krb5_ccache of the caller.
1873          */
1874         code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
1875                                         &store_creds);
1876         krb5_free_creds(ctx, s4u2proxy_creds);
1877         if (code != 0) {
1878                 krb5_free_principal(ctx, whitelist_principal);
1879                 krb5_free_principal(ctx, blacklist_principal);
1880                 return code;
1881         }
1882
1883         /*
1884          * It's important to store the principal the KDC
1885          * returned, as otherwise the caller would not find
1886          * the S4U2Self ticket in the krb5_ccache lookup.
1887          */
1888         store_principal = store_creds.client;
1889
1890  store:
1891         if (blacklist_principal &&
1892             krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
1893                 char *sp = NULL;
1894                 char *ip = NULL;
1895
1896                 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
1897                 if (code != 0) {
1898                         sp = NULL;
1899                 }
1900                 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
1901                 if (code != 0) {
1902                         ip = NULL;
1903                 }
1904                 DEBUG(1, ("kerberos_kinit_password_cc: "
1905                           "KDC returned self principal[%s] while impersonating [%s]\n",
1906                           sp?sp:"<no memory>",
1907                           ip?ip:"<no memory>"));
1908
1909                 SAFE_FREE(sp);
1910                 SAFE_FREE(ip);
1911
1912                 krb5_free_principal(ctx, whitelist_principal);
1913                 krb5_free_principal(ctx, blacklist_principal);
1914                 krb5_free_cred_contents(ctx, &store_creds);
1915                 return KRB5_FWD_BAD_PRINCIPAL;
1916         }
1917         if (blacklist_principal) {
1918                 krb5_free_principal(ctx, blacklist_principal);
1919         }
1920
1921         if (whitelist_principal &&
1922             !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
1923                 char *sp = NULL;
1924                 char *ep = NULL;
1925
1926                 code = krb5_unparse_name(ctx, store_creds.client, &sp);
1927                 if (code != 0) {
1928                         sp = NULL;
1929                 }
1930                 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
1931                 if (code != 0) {
1932                         ep = NULL;
1933                 }
1934                 DEBUG(1, ("kerberos_kinit_password_cc: "
1935                           "KDC returned wrong principal[%s] we expected [%s]\n",
1936                           sp?sp:"<no memory>",
1937                           ep?ep:"<no memory>"));
1938
1939                 SAFE_FREE(sp);
1940                 SAFE_FREE(ep);
1941
1942                 krb5_free_principal(ctx, whitelist_principal);
1943                 krb5_free_cred_contents(ctx, &store_creds);
1944                 return KRB5_FWD_BAD_PRINCIPAL;
1945         }
1946         if (whitelist_principal) {
1947                 krb5_free_principal(ctx, whitelist_principal);
1948         }
1949
1950         code = krb5_cc_initialize(ctx, store_cc, store_principal);
1951         if (code != 0) {
1952                 krb5_free_cred_contents(ctx, &store_creds);
1953                 return code;
1954         }
1955
1956         code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
1957         if (code != 0) {
1958                 krb5_free_cred_contents(ctx, &store_creds);
1959                 return code;
1960         }
1961
1962         if (expire_time) {
1963                 *expire_time = (time_t) store_creds.times.endtime;
1964         }
1965
1966         if (kdc_time) {
1967                 *kdc_time = (time_t) store_creds.times.starttime;
1968         }
1969
1970         krb5_free_cred_contents(ctx, &store_creds);
1971
1972         return 0;
1973 }
1974 #endif
1975
1976 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
1977 krb5_error_code smb_krb5_make_principal(krb5_context context,
1978                                         krb5_principal *principal,
1979                                         const char *_realm, ...)
1980 {
1981         krb5_error_code code;
1982         bool free_realm;
1983         char *realm;
1984         va_list ap;
1985
1986         if (_realm) {
1987                 realm = _realm;
1988                 free_realm = false;
1989         } else {
1990                 code = krb5_get_default_realm(context, &realm);
1991                 if (code) {
1992                         return code;
1993                 }
1994                 free_realm = true;
1995         }
1996
1997         va_start(ap, _realm);
1998         code = krb5_build_principal_alloc_va(context, principal,
1999                                              strlen(realm), realm,
2000                                              ap);
2001         va_end(ap);
2002
2003         if (free_realm) {
2004                 krb5_free_default_realm(context, &realm);
2005         }
2006
2007         return code;
2008 }
2009 #endif
2010
2011 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2012 /**
2013  * @brief Get the lifetime of the initial ticket in the cache.
2014  *
2015  * @param[in]  context  The kerberos context.
2016  *
2017  * @param[in]  id       The credential cache to get the ticket lifetime.
2018  *
2019  * @param[out] t        A pointer to a time value to store the lifetime.
2020  *
2021  * @return              0 on success, a krb5_error_code on error.
2022  */
2023 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2024                                          krb5_ccache id,
2025                                          time_t *t)
2026 {
2027         krb5_cc_cursor cursor;
2028         krb5_error_code kerr;
2029         krb5_creds cred;
2030         krb5_timestamp now;
2031
2032         *t = 0;
2033
2034         kerr = krb5_timeofday(context, &now);
2035         if (kerr) {
2036                 return kerr;
2037         }
2038
2039         kerr = krb5_cc_start_seq_get(context, id, &cursor);
2040         if (kerr) {
2041                 return kerr;
2042         }
2043
2044         while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2045 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2046                 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2047 #else
2048                 if (cred.flags.b.initial) {
2049 #endif
2050                         if (now < cred.times.endtime) {
2051                                 *t = (time_t) (cred.times.endtime - now);
2052                         }
2053                         krb5_free_cred_contents(context, &cred);
2054                         break;
2055                 }
2056                 krb5_free_cred_contents(context, &cred);
2057         }
2058
2059         krb5_cc_end_seq_get(context, id, &cursor);
2060
2061         return kerr;
2062 }
2063 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2064
2065 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2066 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2067 {
2068         free_Checksum(cksum);
2069 }
2070 #endif
2071
2072 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2073                                            DATA_BLOB *pac_data,
2074                                            krb5_context context,
2075                                            const krb5_keyblock *keyblock,
2076                                            uint32_t *sig_type,
2077                                            DATA_BLOB *sig_blob)
2078 {
2079         krb5_error_code ret;
2080         krb5_checksum cksum;
2081 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2082         krb5_crypto crypto;
2083
2084
2085         ret = krb5_crypto_init(context,
2086                                keyblock,
2087                                0,
2088                                &crypto);
2089         if (ret) {
2090                 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2091                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2092                 return ret;
2093         }
2094         ret = krb5_create_checksum(context,
2095                                    crypto,
2096                                    KRB5_KU_OTHER_CKSUM,
2097                                    0,
2098                                    pac_data->data,
2099                                    pac_data->length,
2100                                    &cksum);
2101         if (ret) {
2102                 DEBUG(2, ("PAC Verification failed: %s\n",
2103                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2104         }
2105
2106         krb5_crypto_destroy(context, crypto);
2107
2108         if (ret) {
2109                 return ret;
2110         }
2111
2112         *sig_type = cksum.cksumtype;
2113         *sig_blob = data_blob_talloc(mem_ctx,
2114                                         cksum.checksum.data,
2115                                         cksum.checksum.length);
2116 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2117         krb5_data input;
2118
2119         input.data = (char *)pac_data->data;
2120         input.length = pac_data->length;
2121
2122         ret = krb5_c_make_checksum(context,
2123                                    0,
2124                                    keyblock,
2125                                    KRB5_KEYUSAGE_APP_DATA_CKSUM,
2126                                    &input,
2127                                    &cksum);
2128         if (ret) {
2129                 DEBUG(2, ("PAC Verification failed: %s\n",
2130                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2131                 return ret;
2132         }
2133
2134         *sig_type = cksum.checksum_type;
2135         *sig_blob = data_blob_talloc(mem_ctx,
2136                                         cksum.contents,
2137                                         cksum.length);
2138
2139 #else
2140 #error krb5_create_checksum or krb5_c_make_checksum not available
2141 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2142         smb_krb5_free_checksum_contents(context, &cksum);
2143
2144         return 0;
2145 }
2146
2147
2148 /*
2149  * smb_krb5_principal_get_realm
2150  *
2151  * @brief Get realm of a principal
2152  *
2153  * @param[in] context           The krb5_context
2154  * @param[in] principal         The principal
2155  * @return pointer to the realm
2156  *
2157  */
2158
2159 char *smb_krb5_principal_get_realm(krb5_context context,
2160                                    krb5_principal principal)
2161 {
2162 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2163         return discard_const_p(char, krb5_principal_get_realm(context, principal));
2164 #elif defined(krb5_princ_realm) /* MIT */
2165         krb5_data *realm;
2166         realm = krb5_princ_realm(context, principal);
2167         return discard_const_p(char, realm->data);
2168 #else
2169         return NULL;
2170 #endif
2171 }
2172
2173 /************************************************************************
2174  Routine to get the default realm from the kerberos credentials cache.
2175  Caller must free if the return value is not NULL.
2176 ************************************************************************/
2177
2178 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2179 {
2180         char *realm = NULL;
2181         krb5_context ctx = NULL;
2182         krb5_ccache cc = NULL;
2183         krb5_principal princ = NULL;
2184
2185         initialize_krb5_error_table();
2186         if (krb5_init_context(&ctx)) {
2187                 return NULL;
2188         }
2189
2190         DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2191                 "Trying to read krb5 cache: %s\n",
2192                 krb5_cc_default_name(ctx)));
2193         if (krb5_cc_default(ctx, &cc)) {
2194                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2195                         "failed to read default cache\n"));
2196                 goto out;
2197         }
2198         if (krb5_cc_get_principal(ctx, cc, &princ)) {
2199                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2200                         "failed to get default principal\n"));
2201                 goto out;
2202         }
2203
2204 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2205         realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2206 #elif defined(HAVE_KRB5_PRINC_REALM)
2207         {
2208                 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2209                 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2210         }
2211 #endif
2212
2213   out:
2214
2215         if (ctx) {
2216                 if (princ) {
2217                         krb5_free_principal(ctx, princ);
2218                 }
2219                 if (cc) {
2220                         krb5_cc_close(ctx, cc);
2221                 }
2222                 krb5_free_context(ctx);
2223         }
2224
2225         return realm;
2226 }
2227
2228 /************************************************************************
2229  Routine to get the realm from a given DNS name.
2230 ************************************************************************/
2231
2232 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2233                                                 const char *hostname)
2234 {
2235 #if defined(HAVE_KRB5_REALM_TYPE)
2236         /* Heimdal. */
2237         krb5_realm *realm_list = NULL;
2238 #else
2239         /* MIT */
2240         char **realm_list = NULL;
2241 #endif
2242         char *realm = NULL;
2243         krb5_error_code kerr;
2244         krb5_context ctx = NULL;
2245
2246         initialize_krb5_error_table();
2247         if (krb5_init_context(&ctx)) {
2248                 return NULL;
2249         }
2250
2251         kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2252         if (kerr != 0) {
2253                 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2254                         "failed %s\n",
2255                         hostname ? hostname : "(NULL)",
2256                         error_message(kerr) ));
2257                 goto out;
2258         }
2259
2260         if (realm_list && realm_list[0]) {
2261                 realm = talloc_strdup(mem_ctx, realm_list[0]);
2262         }
2263
2264   out:
2265
2266         if (ctx) {
2267                 if (realm_list) {
2268                         krb5_free_host_realm(ctx, realm_list);
2269                         realm_list = NULL;
2270                 }
2271                 krb5_free_context(ctx);
2272                 ctx = NULL;
2273         }
2274         return realm;
2275 }
2276
2277 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2278                                                    const char *service,
2279                                                    const char *remote_name,
2280                                                    const char *default_realm)
2281 {
2282         char *realm = NULL;
2283         char *host = NULL;
2284         char *principal;
2285         host = strchr_m(remote_name, '.');
2286         if (host) {
2287                 /* DNS name. */
2288                 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2289                                                          remote_name);
2290         } else {
2291                 /* NetBIOS name - use our realm. */
2292                 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2293         }
2294
2295         if (realm == NULL || *realm == '\0') {
2296                 realm = talloc_strdup(talloc_tos(), default_realm);
2297                 if (!realm) {
2298                         return NULL;
2299                 }
2300                 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2301                          "cannot get realm from, "
2302                          "desthost %s or default ccache. Using default "
2303                          "smb.conf realm %s\n",
2304                          remote_name,
2305                          realm));
2306         }
2307
2308         principal = talloc_asprintf(mem_ctx,
2309                                     "%s/%s@%s",
2310                                     service, remote_name,
2311                                     realm);
2312         TALLOC_FREE(realm);
2313         return principal;
2314 }
2315
2316 char *smb_get_krb5_error_message(krb5_context context,
2317                                  krb5_error_code code,
2318                                  TALLOC_CTX *mem_ctx)
2319 {
2320         char *ret;
2321
2322 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2323         const char *context_error = krb5_get_error_message(context, code);
2324         if (context_error) {
2325                 ret = talloc_asprintf(mem_ctx, "%s: %s",
2326                                         error_message(code), context_error);
2327                 krb5_free_error_message(context, context_error);
2328                 return ret;
2329         }
2330 #endif
2331         ret = talloc_strdup(mem_ctx, error_message(code));
2332         return ret;
2333 }
2334
2335 const krb5_enctype *samba_all_enctypes(void)
2336 {
2337         /* TODO: Find a way not to have to use a fixed list */
2338         static const krb5_enctype enctypes[] = {
2339                 KRB5_ENCTYPE_DES_CBC_CRC,
2340                 KRB5_ENCTYPE_DES_CBC_MD5,
2341                 KRB5_ENCTYPE_AES128_CTS_HMAC_SHA1_96,
2342                 KRB5_ENCTYPE_AES256_CTS_HMAC_SHA1_96,
2343                 KRB5_ENCTYPE_ARCFOUR_HMAC_MD5,
2344                 0
2345         };
2346         return enctypes;
2347 };
2348
2349 #else /* HAVE_KRB5 */
2350  /* this saves a few linking headaches */
2351  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2352                         const char *principal, time_t time_offset,
2353                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2354                         uint32_t extra_ap_opts,
2355                         const char *ccname, time_t *tgs_expire,
2356                         const char *impersonate_princ_s)
2357 {
2358          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2359          return 1;
2360 }
2361
2362 #endif /* HAVE_KRB5 */