source4/kdc/pac-glue.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    PAC Glue between Samba and the KDC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
   7    Copyright (C) Simo Sorce <idra@samba.org> 2010
   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
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "../libds/common/flags.h"
  26 #include <ldb.h>
  27 #include "auth/auth.h"
  28 #include "auth/auth_sam_reply.h"
  29 #include "system/kerberos.h"
  30 #include "auth/kerberos/kerberos.h"
  31 #include "kdc/samba_kdc.h"
  32 #include "kdc/pac-glue.h"
  33 #include "param/param.h"
  34 #include "librpc/gen_ndr/ndr_krb5pac.h"
  35 #include "libcli/security/security.h"
  36 #include "dsdb/samdb/samdb.h"
  37 #include "auth/kerberos/pac_utils.h"
  38
  39 static
  40 NTSTATUS samba_get_logon_info_pac_blob(TALLOC_CTX *mem_ctx,
  41                                        const struct auth_user_info_dc *info,
  42                                        DATA_BLOB *pac_data)
  43 {
  44         struct netr_SamInfo3 *info3;
  45         union PAC_INFO pac_info;
  46         enum ndr_err_code ndr_err;
  47         NTSTATUS nt_status;
  48
  49         ZERO_STRUCT(pac_info);
  50
  51         *pac_data = data_blob_null;
  52
  53         nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx, info, &info3);
  54         if (!NT_STATUS_IS_OK(nt_status)) {
  55                 DEBUG(1, ("Getting Samba info failed: %s\n",
  56                           nt_errstr(nt_status)));
  57                 return nt_status;
  58         }
  59
  60         pac_info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
  61         if (!pac_info.logon_info.info) {
  62                 return NT_STATUS_NO_MEMORY;
  63         }
  64
  65         pac_info.logon_info.info->info3 = *info3;
  66
  67         ndr_err = ndr_push_union_blob(pac_data, mem_ctx, &pac_info,
  68                                       PAC_TYPE_LOGON_INFO,
  69                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
  70         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  71                 nt_status = ndr_map_error2ntstatus(ndr_err);
  72                 DEBUG(1, ("PAC_LOGON_INFO (presig) push failed: %s\n",
  73                           nt_errstr(nt_status)));
  74                 return nt_status;
  75         }
  76
  77         return NT_STATUS_OK;
  78 }
  79
  80 static
  81 NTSTATUS samba_get_cred_info_ndr_blob(TALLOC_CTX *mem_ctx,
  82                                       const struct ldb_message *msg,
  83                                       DATA_BLOB *cred_blob)
  84 {
  85         enum ndr_err_code ndr_err;
  86         NTSTATUS nt_status;
  87         int ret;
  88         static const struct samr_Password zero_hash;
  89         struct samr_Password *lm_hash = NULL;
  90         struct samr_Password *nt_hash = NULL;
  91         struct PAC_CREDENTIAL_NTLM_SECPKG ntlm_secpkg = {
  92                 .version = 0,
  93         };
  94         DATA_BLOB ntlm_blob = data_blob_null;
  95         struct PAC_CREDENTIAL_SUPPLEMENTAL_SECPKG secpkgs[1] = {{
  96                 .credential_size = 0,
  97         }};
  98         struct PAC_CREDENTIAL_DATA cred_data = {
  99                 .credential_count = 0,
 100         };
 101         struct PAC_CREDENTIAL_DATA_NDR cred_ndr;
 102
 103         ZERO_STRUCT(cred_ndr);
 104
 105         *cred_blob = data_blob_null;
 106
 107         lm_hash = samdb_result_hash(mem_ctx, msg, "dBCSPwd");
 108         if (lm_hash != NULL) {
 109                 ret = memcmp(lm_hash->hash, zero_hash.hash, 16);
 110                 if (ret == 0) {
 111                         lm_hash = NULL;
 112                 }
 113         }
 114         if (lm_hash != NULL) {
 115                 DEBUG(5, ("Passing LM password hash through credentials set\n"));
 116                 ntlm_secpkg.flags |= PAC_CREDENTIAL_NTLM_HAS_LM_HASH;
 117                 ntlm_secpkg.lm_password = *lm_hash;
 118                 ZERO_STRUCTP(lm_hash);
 119                 TALLOC_FREE(lm_hash);
 120         }
 121
 122         nt_hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 123         if (nt_hash != NULL) {
 124                 ret = memcmp(nt_hash->hash, zero_hash.hash, 16);
 125                 if (ret == 0) {
 126                         nt_hash = NULL;
 127                 }
 128         }
 129         if (nt_hash != NULL) {
 130                 DEBUG(5, ("Passing LM password hash through credentials set\n"));
 131                 ntlm_secpkg.flags |= PAC_CREDENTIAL_NTLM_HAS_NT_HASH;
 132                 ntlm_secpkg.nt_password = *nt_hash;
 133                 ZERO_STRUCTP(nt_hash);
 134                 TALLOC_FREE(nt_hash);
 135         }
 136
 137         if (ntlm_secpkg.flags == 0) {
 138                 return NT_STATUS_OK;
 139         }
 140
 141 #ifdef DEBUG_PASSWORD
 142         if (DEBUGLVL(11)) {
 143                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_NTLM_SECPKG, &ntlm_secpkg);
 144         }
 145 #endif
 146
 147         ndr_err = ndr_push_struct_blob(&ntlm_blob, mem_ctx, &ntlm_secpkg,
 148                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_NTLM_SECPKG);
 149         ZERO_STRUCT(ntlm_secpkg);
 150         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 151                 nt_status = ndr_map_error2ntstatus(ndr_err);
 152                 DEBUG(1, ("PAC_CREDENTIAL_NTLM_SECPKG (presig) push failed: %s\n",
 153                           nt_errstr(nt_status)));
 154                 return nt_status;
 155         }
 156
 157         DEBUG(10, ("NTLM credential BLOB (len %zu) for user\n",
 158                   ntlm_blob.length));
 159         dump_data_pw("PAC_CREDENTIAL_NTLM_SECPKG",
 160                      ntlm_blob.data, ntlm_blob.length);
 161
 162         secpkgs[0].package_name.string = discard_const_p(char, "NTLM");
 163         secpkgs[0].credential_size = ntlm_blob.length;
 164         secpkgs[0].credential = ntlm_blob.data;
 165
 166         cred_data.credential_count = ARRAY_SIZE(secpkgs);
 167         cred_data.credentials = secpkgs;
 168
 169 #ifdef DEBUG_PASSWORD
 170         if (DEBUGLVL(11)) {
 171                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_DATA, &cred_data);
 172         }
 173 #endif
 174
 175         cred_ndr.ctr.data = &cred_data;
 176
 177 #ifdef DEBUG_PASSWORD
 178         if (DEBUGLVL(11)) {
 179                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_DATA_NDR, &cred_ndr);
 180         }
 181 #endif
 182
 183         ndr_err = ndr_push_struct_blob(cred_blob, mem_ctx, &cred_ndr,
 184                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_DATA_NDR);
 185         data_blob_clear(&ntlm_blob);
 186         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 187                 nt_status = ndr_map_error2ntstatus(ndr_err);
 188                 DEBUG(1, ("PAC_CREDENTIAL_DATA_NDR (presig) push failed: %s\n",
 189                           nt_errstr(nt_status)));
 190                 return nt_status;
 191         }
 192
 193         DEBUG(10, ("Created credential BLOB (len %zu) for user\n",
 194                   cred_blob->length));
 195         dump_data_pw("PAC_CREDENTIAL_DATA_NDR",
 196                      cred_blob->data, cred_blob->length);
 197
 198         return NT_STATUS_OK;
 199 }
 200
 201 krb5_error_code samba_kdc_encrypt_pac_credentials(krb5_context context,
 202                                                   const krb5_keyblock *pkreplykey,
 203                                                   const DATA_BLOB *cred_ndr_blob,
 204                                                   TALLOC_CTX *mem_ctx,
 205                                                   DATA_BLOB *cred_info_blob)
 206 {
 207         krb5_crypto cred_crypto;
 208         krb5_enctype cred_enctype;
 209         krb5_data cred_ndr_crypt;
 210         struct PAC_CREDENTIAL_INFO pac_cred_info = { .version = 0, };
 211         krb5_error_code ret;
 212         const char *krb5err;
 213         enum ndr_err_code ndr_err;
 214         NTSTATUS nt_status;
 215
 216         *cred_info_blob = data_blob_null;
 217
 218         ret = krb5_crypto_init(context, pkreplykey, ETYPE_NULL,
 219                                &cred_crypto);
 220         if (ret != 0) {
 221                 krb5err = krb5_get_error_message(context, ret);
 222                 DEBUG(1, ("Failed initializing cred data crypto: %s\n", krb5err));
 223                 krb5_free_error_message(context, krb5err);
 224                 return ret;
 225         }
 226
 227         ret = krb5_crypto_getenctype(context, cred_crypto, &cred_enctype);
 228         if (ret != 0) {
 229                 DEBUG(1, ("Failed getting crypto type for key\n"));
 230                 krb5_crypto_destroy(context, cred_crypto);
 231                 return ret;
 232         }
 233
 234         DEBUG(10, ("Plain cred_ndr_blob (len %zu)\n",
 235                   cred_ndr_blob->length));
 236         dump_data_pw("PAC_CREDENTIAL_DATA_NDR",
 237                      cred_ndr_blob->data, cred_ndr_blob->length);
 238
 239         ret = krb5_encrypt(context, cred_crypto,
 240                            KRB5_KU_OTHER_ENCRYPTED,
 241                            cred_ndr_blob->data, cred_ndr_blob->length,
 242                            &cred_ndr_crypt);
 243         krb5_crypto_destroy(context, cred_crypto);
 244         if (ret != 0) {
 245                 krb5err = krb5_get_error_message(context, ret);
 246                 DEBUG(1, ("Failed crypt of cred data: %s\n", krb5err));
 247                 krb5_free_error_message(context, krb5err);
 248                 return ret;
 249         }
 250
 251         pac_cred_info.encryption_type = cred_enctype;
 252         pac_cred_info.encrypted_data.length = cred_ndr_crypt.length;
 253         pac_cred_info.encrypted_data.data = (uint8_t *)cred_ndr_crypt.data;
 254
 255         if (DEBUGLVL(10)) {
 256                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_INFO, &pac_cred_info);
 257         }
 258
 259         ndr_err = ndr_push_struct_blob(cred_info_blob, mem_ctx, &pac_cred_info,
 260                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_INFO);
 261         krb5_data_free(&cred_ndr_crypt);
 262         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 263                 nt_status = ndr_map_error2ntstatus(ndr_err);
 264                 DEBUG(1, ("PAC_CREDENTIAL_INFO (presig) push failed: %s\n",
 265                           nt_errstr(nt_status)));
 266                 return KRB5KDC_ERR_SVC_UNAVAILABLE;
 267         }
 268
 269         DEBUG(10, ("Encrypted credential BLOB (len %zu) with alg %d\n",
 270                   cred_info_blob->length, (int)pac_cred_info.encryption_type));
 271         dump_data_pw("PAC_CREDENTIAL_INFO",
 272                       cred_info_blob->data, cred_info_blob->length);
 273
 274         return 0;
 275 }
 276
 277 krb5_error_code samba_make_krb5_pac(krb5_context context,
 278                                     const DATA_BLOB *logon_blob,
 279                                     const DATA_BLOB *cred_blob,
 280                                     const DATA_BLOB *deleg_blob,
 281                                     krb5_pac *pac)
 282 {
 283         krb5_data logon_data;
 284         krb5_data cred_data;
 285         krb5_data deleg_data;
 286         krb5_data null_data;
 287         krb5_error_code ret;
 288
 289         ZERO_STRUCT(null_data);
 290
 291         /* The user account may be set not to want the PAC */
 292         if (logon_blob == NULL) {
 293                 return 0;
 294         }
 295
 296         ret = krb5_copy_data_contents(&logon_data,
 297                                       logon_blob->data,
 298                                       logon_blob->length);
 299         if (ret != 0) {
 300                 return ret;
 301         }
 302
 303         ZERO_STRUCT(cred_data);
 304         if (cred_blob != NULL) {
 305                 ret = krb5_copy_data_contents(&cred_data,
 306                                               cred_blob->data,
 307                                               cred_blob->length);
 308                 if (ret != 0) {
 309                         kerberos_free_data_contents(context, &logon_data);
 310                         return ret;
 311                 }
 312         }
 313
 314         ZERO_STRUCT(deleg_data);
 315         if (deleg_blob != NULL) {
 316                 ret = krb5_copy_data_contents(&deleg_data,
 317                                               deleg_blob->data,
 318                                               deleg_blob->length);
 319                 if (ret != 0) {
 320                         kerberos_free_data_contents(context, &logon_data);
 321                         kerberos_free_data_contents(context, &cred_data);
 322                         return ret;
 323                 }
 324         }
 325
 326         ret = krb5_pac_init(context, pac);
 327         if (ret != 0) {
 328                 kerberos_free_data_contents(context, &logon_data);
 329                 kerberos_free_data_contents(context, &cred_data);
 330                 kerberos_free_data_contents(context, &deleg_data);
 331                 return ret;
 332         }
 333
 334         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &logon_data);
 335         kerberos_free_data_contents(context, &logon_data);
 336         if (ret != 0) {
 337                 kerberos_free_data_contents(context, &cred_data);
 338                 kerberos_free_data_contents(context, &deleg_data);
 339                 return ret;
 340         }
 341
 342         if (cred_blob != NULL) {
 343                 ret = krb5_pac_add_buffer(context, *pac,
 344                                           PAC_TYPE_CREDENTIAL_INFO,
 345                                           &cred_data);
 346                 kerberos_free_data_contents(context, &cred_data);
 347                 if (ret != 0) {
 348                         kerberos_free_data_contents(context, &deleg_data);
 349                         return ret;
 350                 }
 351         }
 352
 353         if (deleg_blob != NULL) {
 354                 ret = krb5_pac_add_buffer(context, *pac,
 355                                           PAC_TYPE_CONSTRAINED_DELEGATION,
 356                                           &deleg_data);
 357                 kerberos_free_data_contents(context, &deleg_data);
 358                 if (ret != 0) {
 359                         return ret;
 360                 }
 361         }
 362
 363         return ret;
 364 }
 365
 366 bool samba_princ_needs_pac(struct samba_kdc_entry *skdc_entry)
 367 {
 368
 369         uint32_t userAccountControl;
 370
 371         /* The service account may be set not to want the PAC */
 372         userAccountControl = ldb_msg_find_attr_as_uint(skdc_entry->msg, "userAccountControl", 0);
 373         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 374                 return false;
 375         }
 376
 377         return true;
 378 }
 379
 380 /* Was the krbtgt in this DB (ie, should we check the incoming signature) and was it an RODC */
 381 int samba_krbtgt_is_in_db(struct samba_kdc_entry *p,
 382                           bool *is_in_db,
 383                           bool *is_untrusted)
 384 {
 385         NTSTATUS status;
 386         int rodc_krbtgt_number, trust_direction;
 387         uint32_t rid;
 388
 389         TALLOC_CTX *mem_ctx = talloc_new(NULL);
 390         if (!mem_ctx) {
 391                 return ENOMEM;
 392         }
 393
 394         trust_direction = ldb_msg_find_attr_as_int(p->msg, "trustDirection", 0);
 395
 396         if (trust_direction != 0) {
 397                 /* Domain trust - we cannot check the sig, but we trust it for a correct PAC
 398
 399                    This is exactly where we should flag for SID
 400                    validation when we do inter-foreest trusts
 401                  */
 402                 talloc_free(mem_ctx);
 403                 *is_untrusted = false;
 404                 *is_in_db = false;
 405                 return 0;
 406         }
 407
 408         /* The lack of password controls etc applies to krbtgt by
 409          * virtue of being that particular RID */
 410         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, p->msg, "objectSid"), NULL, &rid);
 411
 412         if (!NT_STATUS_IS_OK(status)) {
 413                 talloc_free(mem_ctx);
 414                 return EINVAL;
 415         }
 416
 417         rodc_krbtgt_number = ldb_msg_find_attr_as_int(p->msg, "msDS-SecondaryKrbTgtNumber", -1);
 418
 419         if (p->kdc_db_ctx->my_krbtgt_number == 0) {
 420                 if (rid == DOMAIN_RID_KRBTGT) {
 421                         *is_untrusted = false;
 422                         *is_in_db = true;
 423                         talloc_free(mem_ctx);
 424                         return 0;
 425                 } else if (rodc_krbtgt_number != -1) {
 426                         *is_in_db = true;
 427                         *is_untrusted = true;
 428                         talloc_free(mem_ctx);
 429                         return 0;
 430                 }
 431         } else if ((rid != DOMAIN_RID_KRBTGT) && (rodc_krbtgt_number == p->kdc_db_ctx->my_krbtgt_number)) {
 432                 talloc_free(mem_ctx);
 433                 *is_untrusted = false;
 434                 *is_in_db = true;
 435                 return 0;
 436         } else if (rid == DOMAIN_RID_KRBTGT) {
 437                 /* krbtgt viewed from an RODC */
 438                 talloc_free(mem_ctx);
 439                 *is_untrusted = false;
 440                 *is_in_db = false;
 441                 return 0;
 442         }
 443
 444         /* Another RODC */
 445         talloc_free(mem_ctx);
 446         *is_untrusted = true;
 447         *is_in_db = false;
 448         return 0;
 449 }
 450
 451 NTSTATUS samba_kdc_get_pac_blobs(TALLOC_CTX *mem_ctx,
 452                                  struct samba_kdc_entry *p,
 453                                  DATA_BLOB **_logon_info_blob,
 454                                  DATA_BLOB **_cred_ndr_blob)
 455 {
 456         struct auth_user_info_dc *user_info_dc;
 457         DATA_BLOB *logon_blob = NULL;
 458         DATA_BLOB *cred_blob = NULL;
 459         NTSTATUS nt_status;
 460
 461         *_logon_info_blob = NULL;
 462         if (_cred_ndr_blob != NULL) {
 463                 *_cred_ndr_blob = NULL;
 464         }
 465
 466         /* The user account may be set not to want the PAC */
 467         if ( ! samba_princ_needs_pac(p)) {
 468                 return NT_STATUS_OK;
 469         }
 470
 471         logon_blob = talloc_zero(mem_ctx, DATA_BLOB);
 472         if (logon_blob == NULL) {
 473                 return NT_STATUS_NO_MEMORY;
 474         }
 475
 476         if (_cred_ndr_blob != NULL) {
 477                 cred_blob = talloc_zero(mem_ctx, DATA_BLOB);
 478                 if (cred_blob == NULL) {
 479                         return NT_STATUS_NO_MEMORY;
 480                 }
 481         }
 482
 483         nt_status = authsam_make_user_info_dc(mem_ctx, p->kdc_db_ctx->samdb,
 484                                              lpcfg_netbios_name(p->kdc_db_ctx->lp_ctx),
 485                                              lpcfg_sam_name(p->kdc_db_ctx->lp_ctx),
 486                                              lpcfg_sam_dnsname(p->kdc_db_ctx->lp_ctx),
 487                                              p->realm_dn,
 488                                              p->msg,
 489                                              data_blob(NULL, 0),
 490                                              data_blob(NULL, 0),
 491                                              &user_info_dc);
 492         if (!NT_STATUS_IS_OK(nt_status)) {
 493                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 494                           nt_errstr(nt_status)));
 495                 return nt_status;
 496         }
 497
 498         nt_status = samba_get_logon_info_pac_blob(logon_blob,
 499                                                   user_info_dc,
 500                                                   logon_blob);
 501         if (!NT_STATUS_IS_OK(nt_status)) {
 502                 DEBUG(0, ("Building PAC LOGON INFO failed: %s\n",
 503                           nt_errstr(nt_status)));
 504                 return nt_status;
 505         }
 506
 507         if (cred_blob != NULL) {
 508                 nt_status = samba_get_cred_info_ndr_blob(cred_blob,
 509                                                          p->msg,
 510                                                          cred_blob);
 511                 if (!NT_STATUS_IS_OK(nt_status)) {
 512                         DEBUG(0, ("Building PAC CRED INFO failed: %s\n",
 513                                   nt_errstr(nt_status)));
 514                         return nt_status;
 515                 }
 516         }
 517
 518         TALLOC_FREE(user_info_dc);
 519         *_logon_info_blob = logon_blob;
 520         if (_cred_ndr_blob != NULL) {
 521                 *_cred_ndr_blob = cred_blob;
 522         }
 523         return NT_STATUS_OK;
 524 }
 525
 526 NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
 527                                 struct samba_kdc_entry *p,
 528                                 DATA_BLOB **_logon_info_blob)
 529 {
 530         NTSTATUS nt_status;
 531
 532         nt_status = samba_kdc_get_pac_blobs(mem_ctx, p,
 533                                             _logon_info_blob,
 534                                             NULL);
 535         if (!NT_STATUS_IS_OK(nt_status)) {
 536                 return nt_status;
 537         }
 538
 539         return NT_STATUS_OK;
 540 }
 541
 542 NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
 543                                    krb5_context context,
 544                                    const krb5_pac pac, DATA_BLOB *pac_blob,
 545                                    struct PAC_SIGNATURE_DATA *pac_srv_sig,
 546                                    struct PAC_SIGNATURE_DATA *pac_kdc_sig)
 547 {
 548         struct auth_user_info_dc *user_info_dc;
 549         krb5_error_code ret;
 550         NTSTATUS nt_status;
 551
 552         ret = kerberos_pac_to_user_info_dc(mem_ctx, pac,
 553                                            context, &user_info_dc, pac_srv_sig, pac_kdc_sig);
 554         if (ret) {
 555                 return NT_STATUS_UNSUCCESSFUL;
 556         }
 557
 558         nt_status = samba_get_logon_info_pac_blob(mem_ctx,
 559                                                   user_info_dc, pac_blob);
 560
 561         return nt_status;
 562 }
 563
 564 NTSTATUS samba_kdc_update_delegation_info_blob(TALLOC_CTX *mem_ctx,
 565                                 krb5_context context,
 566                                 const krb5_pac pac,
 567                                 const krb5_principal server_principal,
 568                                 const krb5_principal proxy_principal,
 569                                 DATA_BLOB *new_blob)
 570 {
 571         krb5_data old_data;
 572         DATA_BLOB old_blob;
 573         krb5_error_code ret;
 574         NTSTATUS nt_status;
 575         enum ndr_err_code ndr_err;
 576         union PAC_INFO info;
 577         struct PAC_CONSTRAINED_DELEGATION _d;
 578         struct PAC_CONSTRAINED_DELEGATION *d = NULL;
 579         char *server = NULL;
 580         char *proxy = NULL;
 581         uint32_t i;
 582         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 583
 584         if (tmp_ctx == NULL) {
 585                 return NT_STATUS_NO_MEMORY;
 586         }
 587
 588         ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_CONSTRAINED_DELEGATION, &old_data);
 589         if (ret == ENOENT) {
 590                 ZERO_STRUCT(old_data);
 591         } else if (ret) {
 592                 talloc_free(tmp_ctx);
 593                 return NT_STATUS_UNSUCCESSFUL;
 594         }
 595
 596         old_blob.length = old_data.length;
 597         old_blob.data = (uint8_t *)old_data.data;
 598
 599         ZERO_STRUCT(info);
 600         if (old_blob.length > 0) {
 601                 ndr_err = ndr_pull_union_blob(&old_blob, mem_ctx,
 602                                 &info, PAC_TYPE_CONSTRAINED_DELEGATION,
 603                                 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
 604                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 605                         kerberos_free_data_contents(context, &old_data);
 606                         nt_status = ndr_map_error2ntstatus(ndr_err);
 607                         DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 608                         talloc_free(tmp_ctx);
 609                         return nt_status;
 610                 }
 611         } else {
 612                 ZERO_STRUCT(_d);
 613                 info.constrained_delegation.info = &_d;
 614         }
 615         kerberos_free_data_contents(context, &old_data);
 616
 617         ret = krb5_unparse_name(context, server_principal, &server);
 618         if (ret) {
 619                 talloc_free(tmp_ctx);
 620                 return NT_STATUS_INTERNAL_ERROR;
 621         }
 622
 623         ret = krb5_unparse_name_flags(context, proxy_principal,
 624                                       KRB5_PRINCIPAL_UNPARSE_NO_REALM, &proxy);
 625         if (ret) {
 626                 SAFE_FREE(server);
 627                 talloc_free(tmp_ctx);
 628                 return NT_STATUS_INTERNAL_ERROR;
 629         }
 630
 631         d = info.constrained_delegation.info;
 632         i = d->num_transited_services;
 633         d->proxy_target.string = server;
 634         d->transited_services = talloc_realloc(mem_ctx, d->transited_services,
 635                                                struct lsa_String, i + 1);
 636         d->transited_services[i].string = proxy;
 637         d->num_transited_services = i + 1;
 638
 639         ndr_err = ndr_push_union_blob(new_blob, mem_ctx,
 640                                 &info, PAC_TYPE_CONSTRAINED_DELEGATION,
 641                                 (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
 642         SAFE_FREE(server);
 643         SAFE_FREE(proxy);
 644         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 645                 kerberos_free_data_contents(context, &old_data);
 646                 nt_status = ndr_map_error2ntstatus(ndr_err);
 647                 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 648                 talloc_free(tmp_ctx);
 649                 return nt_status;
 650         }
 651
 652         talloc_free(tmp_ctx);
 653         return NT_STATUS_OK;
 654 }
 655
 656 /* function to map policy errors */
 657 krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
 658 {
 659         krb5_error_code ret;
 660
 661         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 662                 ret = KRB5KDC_ERR_KEY_EXP;
 663         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 664                 ret = KRB5KDC_ERR_KEY_EXP;
 665         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 666                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 667         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 668                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 669         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 670                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 671         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 672                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 673         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 674                 ret = KRB5KDC_ERR_POLICY;
 675         else
 676                 ret = KRB5KDC_ERR_POLICY;
 677
 678         return ret;
 679 }
 680
 681 /* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
 682  * for consistency */
 683 NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
 684                                        const char *client_name,
 685                                        const char *workstation,
 686                                        bool password_change)
 687 {
 688         TALLOC_CTX *tmp_ctx;
 689         NTSTATUS nt_status;
 690
 691         tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
 692         if (!tmp_ctx) {
 693                 return NT_STATUS_NO_MEMORY;
 694         }
 695
 696         /* we allow all kinds of trusts here */
 697         nt_status = authsam_account_ok(tmp_ctx,
 698                                        kdc_entry->kdc_db_ctx->samdb,
 699                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 700                                        MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 701                                        kdc_entry->realm_dn, kdc_entry->msg,
 702                                        workstation, client_name,
 703                                        true, password_change);
 704
 705         talloc_free(tmp_ctx);
 706         return nt_status;
 707 }