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_upn_info_pac_blob(TALLOC_CTX *mem_ctx,
  82                                      const struct auth_user_info_dc *info,
  83                                      DATA_BLOB *upn_data)
  84 {
  85         union PAC_INFO pac_upn;
  86         enum ndr_err_code ndr_err;
  87         NTSTATUS nt_status;
  88
  89         ZERO_STRUCT(pac_upn);
  90
  91         *upn_data = data_blob_null;
  92
  93         pac_upn.upn_dns_info.upn_name = info->info->user_principal_name;
  94         pac_upn.upn_dns_info.dns_domain_name = strupper_talloc(mem_ctx,
  95                                                 info->info->dns_domain_name);
  96         if (pac_upn.upn_dns_info.dns_domain_name == NULL) {
  97                 return NT_STATUS_NO_MEMORY;
  98         }
  99         if (info->info->user_principal_constructed) {
 100                 pac_upn.upn_dns_info.flags |= PAC_UPN_DNS_FLAG_CONSTRUCTED;
 101         }
 102
 103         ndr_err = ndr_push_union_blob(upn_data, mem_ctx, &pac_upn,
 104                                       PAC_TYPE_UPN_DNS_INFO,
 105                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
 106         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 107                 nt_status = ndr_map_error2ntstatus(ndr_err);
 108                 DEBUG(1, ("PAC UPN_DNS_INFO (presig) push failed: %s\n",
 109                           nt_errstr(nt_status)));
 110                 return nt_status;
 111         }
 112
 113         return NT_STATUS_OK;
 114 }
 115
 116 static
 117 NTSTATUS samba_get_cred_info_ndr_blob(TALLOC_CTX *mem_ctx,
 118                                       const struct ldb_message *msg,
 119                                       DATA_BLOB *cred_blob)
 120 {
 121         enum ndr_err_code ndr_err;
 122         NTSTATUS nt_status;
 123         struct samr_Password *lm_hash = NULL;
 124         struct samr_Password *nt_hash = NULL;
 125         struct PAC_CREDENTIAL_NTLM_SECPKG ntlm_secpkg = {
 126                 .version = 0,
 127         };
 128         DATA_BLOB ntlm_blob = data_blob_null;
 129         struct PAC_CREDENTIAL_SUPPLEMENTAL_SECPKG secpkgs[1] = {{
 130                 .credential_size = 0,
 131         }};
 132         struct PAC_CREDENTIAL_DATA cred_data = {
 133                 .credential_count = 0,
 134         };
 135         struct PAC_CREDENTIAL_DATA_NDR cred_ndr;
 136
 137         ZERO_STRUCT(cred_ndr);
 138
 139         *cred_blob = data_blob_null;
 140
 141         lm_hash = samdb_result_hash(mem_ctx, msg, "dBCSPwd");
 142         if (lm_hash != NULL) {
 143                 bool zero = all_zero(lm_hash->hash, 16);
 144                 if (zero) {
 145                         lm_hash = NULL;
 146                 }
 147         }
 148         if (lm_hash != NULL) {
 149                 DEBUG(5, ("Passing LM password hash through credentials set\n"));
 150                 ntlm_secpkg.flags |= PAC_CREDENTIAL_NTLM_HAS_LM_HASH;
 151                 ntlm_secpkg.lm_password = *lm_hash;
 152                 ZERO_STRUCTP(lm_hash);
 153                 TALLOC_FREE(lm_hash);
 154         }
 155
 156         nt_hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 157         if (nt_hash != NULL) {
 158                 bool zero = all_zero(nt_hash->hash, 16);
 159                 if (zero) {
 160                         nt_hash = NULL;
 161                 }
 162         }
 163         if (nt_hash != NULL) {
 164                 DEBUG(5, ("Passing LM password hash through credentials set\n"));
 165                 ntlm_secpkg.flags |= PAC_CREDENTIAL_NTLM_HAS_NT_HASH;
 166                 ntlm_secpkg.nt_password = *nt_hash;
 167                 ZERO_STRUCTP(nt_hash);
 168                 TALLOC_FREE(nt_hash);
 169         }
 170
 171         if (ntlm_secpkg.flags == 0) {
 172                 return NT_STATUS_OK;
 173         }
 174
 175 #ifdef DEBUG_PASSWORD
 176         if (DEBUGLVL(11)) {
 177                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_NTLM_SECPKG, &ntlm_secpkg);
 178         }
 179 #endif
 180
 181         ndr_err = ndr_push_struct_blob(&ntlm_blob, mem_ctx, &ntlm_secpkg,
 182                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_NTLM_SECPKG);
 183         ZERO_STRUCT(ntlm_secpkg);
 184         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 185                 nt_status = ndr_map_error2ntstatus(ndr_err);
 186                 DEBUG(1, ("PAC_CREDENTIAL_NTLM_SECPKG (presig) push failed: %s\n",
 187                           nt_errstr(nt_status)));
 188                 return nt_status;
 189         }
 190
 191         DEBUG(10, ("NTLM credential BLOB (len %zu) for user\n",
 192                   ntlm_blob.length));
 193         dump_data_pw("PAC_CREDENTIAL_NTLM_SECPKG",
 194                      ntlm_blob.data, ntlm_blob.length);
 195
 196         secpkgs[0].package_name.string = discard_const_p(char, "NTLM");
 197         secpkgs[0].credential_size = ntlm_blob.length;
 198         secpkgs[0].credential = ntlm_blob.data;
 199
 200         cred_data.credential_count = ARRAY_SIZE(secpkgs);
 201         cred_data.credentials = secpkgs;
 202
 203 #ifdef DEBUG_PASSWORD
 204         if (DEBUGLVL(11)) {
 205                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_DATA, &cred_data);
 206         }
 207 #endif
 208
 209         cred_ndr.ctr.data = &cred_data;
 210
 211 #ifdef DEBUG_PASSWORD
 212         if (DEBUGLVL(11)) {
 213                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_DATA_NDR, &cred_ndr);
 214         }
 215 #endif
 216
 217         ndr_err = ndr_push_struct_blob(cred_blob, mem_ctx, &cred_ndr,
 218                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_DATA_NDR);
 219         data_blob_clear(&ntlm_blob);
 220         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 221                 nt_status = ndr_map_error2ntstatus(ndr_err);
 222                 DEBUG(1, ("PAC_CREDENTIAL_DATA_NDR (presig) push failed: %s\n",
 223                           nt_errstr(nt_status)));
 224                 return nt_status;
 225         }
 226
 227         DEBUG(10, ("Created credential BLOB (len %zu) for user\n",
 228                   cred_blob->length));
 229         dump_data_pw("PAC_CREDENTIAL_DATA_NDR",
 230                      cred_blob->data, cred_blob->length);
 231
 232         return NT_STATUS_OK;
 233 }
 234
 235 #ifdef SAMBA4_USES_HEIMDAL
 236 krb5_error_code samba_kdc_encrypt_pac_credentials(krb5_context context,
 237                                                   const krb5_keyblock *pkreplykey,
 238                                                   const DATA_BLOB *cred_ndr_blob,
 239                                                   TALLOC_CTX *mem_ctx,
 240                                                   DATA_BLOB *cred_info_blob)
 241 {
 242         krb5_crypto cred_crypto;
 243         krb5_enctype cred_enctype;
 244         krb5_data cred_ndr_crypt;
 245         struct PAC_CREDENTIAL_INFO pac_cred_info = { .version = 0, };
 246         krb5_error_code ret;
 247         const char *krb5err;
 248         enum ndr_err_code ndr_err;
 249         NTSTATUS nt_status;
 250
 251         *cred_info_blob = data_blob_null;
 252
 253         ret = krb5_crypto_init(context, pkreplykey, ETYPE_NULL,
 254                                &cred_crypto);
 255         if (ret != 0) {
 256                 krb5err = krb5_get_error_message(context, ret);
 257                 DEBUG(1, ("Failed initializing cred data crypto: %s\n", krb5err));
 258                 krb5_free_error_message(context, krb5err);
 259                 return ret;
 260         }
 261
 262         ret = krb5_crypto_getenctype(context, cred_crypto, &cred_enctype);
 263         if (ret != 0) {
 264                 DEBUG(1, ("Failed getting crypto type for key\n"));
 265                 krb5_crypto_destroy(context, cred_crypto);
 266                 return ret;
 267         }
 268
 269         DEBUG(10, ("Plain cred_ndr_blob (len %zu)\n",
 270                   cred_ndr_blob->length));
 271         dump_data_pw("PAC_CREDENTIAL_DATA_NDR",
 272                      cred_ndr_blob->data, cred_ndr_blob->length);
 273
 274         ret = krb5_encrypt(context, cred_crypto,
 275                            KRB5_KU_OTHER_ENCRYPTED,
 276                            cred_ndr_blob->data, cred_ndr_blob->length,
 277                            &cred_ndr_crypt);
 278         krb5_crypto_destroy(context, cred_crypto);
 279         if (ret != 0) {
 280                 krb5err = krb5_get_error_message(context, ret);
 281                 DEBUG(1, ("Failed crypt of cred data: %s\n", krb5err));
 282                 krb5_free_error_message(context, krb5err);
 283                 return ret;
 284         }
 285
 286         pac_cred_info.encryption_type = cred_enctype;
 287         pac_cred_info.encrypted_data.length = cred_ndr_crypt.length;
 288         pac_cred_info.encrypted_data.data = (uint8_t *)cred_ndr_crypt.data;
 289
 290         if (DEBUGLVL(10)) {
 291                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_INFO, &pac_cred_info);
 292         }
 293
 294         ndr_err = ndr_push_struct_blob(cred_info_blob, mem_ctx, &pac_cred_info,
 295                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_INFO);
 296         krb5_data_free(&cred_ndr_crypt);
 297         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 298                 nt_status = ndr_map_error2ntstatus(ndr_err);
 299                 DEBUG(1, ("PAC_CREDENTIAL_INFO (presig) push failed: %s\n",
 300                           nt_errstr(nt_status)));
 301                 return KRB5KDC_ERR_SVC_UNAVAILABLE;
 302         }
 303
 304         DEBUG(10, ("Encrypted credential BLOB (len %zu) with alg %d\n",
 305                   cred_info_blob->length, (int)pac_cred_info.encryption_type));
 306         dump_data_pw("PAC_CREDENTIAL_INFO",
 307                       cred_info_blob->data, cred_info_blob->length);
 308
 309         return 0;
 310 }
 311 #else /* SAMBA4_USES_HEIMDAL */
 312 krb5_error_code samba_kdc_encrypt_pac_credentials(krb5_context context,
 313                                                   const krb5_keyblock *pkreplykey,
 314                                                   const DATA_BLOB *cred_ndr_blob,
 315                                                   TALLOC_CTX *mem_ctx,
 316                                                   DATA_BLOB *cred_info_blob)
 317 {
 318         krb5_key cred_key;
 319         krb5_enctype cred_enctype;
 320         struct PAC_CREDENTIAL_INFO pac_cred_info = { .version = 0, };
 321         krb5_error_code code;
 322         const char *krb5err;
 323         enum ndr_err_code ndr_err;
 324         NTSTATUS nt_status;
 325         krb5_data cred_ndr_data;
 326         krb5_enc_data cred_ndr_crypt;
 327         size_t enc_len = 0;
 328
 329         *cred_info_blob = data_blob_null;
 330
 331         code = krb5_k_create_key(context,
 332                                  pkreplykey,
 333                                  &cred_key);
 334         if (code != 0) {
 335                 krb5err = krb5_get_error_message(context, code);
 336                 DEBUG(1, ("Failed initializing cred data crypto: %s\n", krb5err));
 337                 krb5_free_error_message(context, krb5err);
 338                 return code;
 339         }
 340
 341         cred_enctype = krb5_k_key_enctype(context, cred_key);
 342
 343         DEBUG(10, ("Plain cred_ndr_blob (len %zu)\n",
 344                   cred_ndr_blob->length));
 345         dump_data_pw("PAC_CREDENTIAL_DATA_NDR",
 346                      cred_ndr_blob->data, cred_ndr_blob->length);
 347
 348         pac_cred_info.encryption_type = cred_enctype;
 349
 350         cred_ndr_data.magic = 0;
 351         cred_ndr_data.data = (char *)cred_ndr_blob->data;
 352         cred_ndr_data.length = cred_ndr_blob->length;
 353
 354         code = krb5_c_encrypt_length(context,
 355                                      cred_enctype,
 356                                      cred_ndr_data.length,
 357                                      &enc_len);
 358         if (code != 0) {
 359                 krb5err = krb5_get_error_message(context, code);
 360                 DEBUG(1, ("Failed initializing cred data crypto: %s\n", krb5err));
 361                 krb5_free_error_message(context, krb5err);
 362                 return code;
 363         }
 364
 365         pac_cred_info.encrypted_data = data_blob_talloc_zero(mem_ctx, enc_len);
 366         if (pac_cred_info.encrypted_data.data == NULL) {
 367                 DBG_ERR("Out of memory\n");
 368                 return ENOMEM;
 369         }
 370
 371         cred_ndr_crypt.ciphertext.length = enc_len;
 372         cred_ndr_crypt.ciphertext.data = (char *)pac_cred_info.encrypted_data.data;
 373
 374         code = krb5_k_encrypt(context,
 375                               cred_key,
 376                               KRB5_KU_OTHER_ENCRYPTED,
 377                               NULL,
 378                               &cred_ndr_data,
 379                               &cred_ndr_crypt);
 380         krb5_k_free_key(context, cred_key);
 381         if (code != 0) {
 382                 krb5err = krb5_get_error_message(context, code);
 383                 DEBUG(1, ("Failed crypt of cred data: %s\n", krb5err));
 384                 krb5_free_error_message(context, krb5err);
 385                 return code;
 386         }
 387
 388         if (DEBUGLVL(10)) {
 389                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_INFO, &pac_cred_info);
 390         }
 391
 392         ndr_err = ndr_push_struct_blob(cred_info_blob, mem_ctx, &pac_cred_info,
 393                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_INFO);
 394         TALLOC_FREE(pac_cred_info.encrypted_data.data);
 395         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 396                 nt_status = ndr_map_error2ntstatus(ndr_err);
 397                 DEBUG(1, ("PAC_CREDENTIAL_INFO (presig) push failed: %s\n",
 398                           nt_errstr(nt_status)));
 399                 return KRB5KDC_ERR_SVC_UNAVAILABLE;
 400         }
 401
 402         DEBUG(10, ("Encrypted credential BLOB (len %zu) with alg %d\n",
 403                   cred_info_blob->length, (int)pac_cred_info.encryption_type));
 404         dump_data_pw("PAC_CREDENTIAL_INFO",
 405                       cred_info_blob->data, cred_info_blob->length);
 406
 407         return 0;
 408 }
 409 #endif /* SAMBA4_USES_HEIMDAL */
 410
 411
 412 krb5_error_code samba_make_krb5_pac(krb5_context context,
 413                                     const DATA_BLOB *logon_blob,
 414                                     const DATA_BLOB *cred_blob,
 415                                     const DATA_BLOB *upn_blob,
 416                                     const DATA_BLOB *deleg_blob,
 417                                     krb5_pac *pac)
 418 {
 419         krb5_data logon_data;
 420         krb5_data cred_data;
 421         krb5_data upn_data;
 422         krb5_data deleg_data;
 423         krb5_error_code ret;
 424 #ifdef SAMBA4_USES_HEIMDAL
 425         krb5_data null_data = {
 426                 .length = 0,
 427                 .data = NULL,
 428         };
 429 #endif
 430
 431         /* The user account may be set not to want the PAC */
 432         if (logon_blob == NULL) {
 433                 return 0;
 434         }
 435
 436         ret = smb_krb5_copy_data_contents(&logon_data,
 437                                           logon_blob->data,
 438                                           logon_blob->length);
 439         if (ret != 0) {
 440                 return ret;
 441         }
 442
 443         ZERO_STRUCT(cred_data);
 444         if (cred_blob != NULL) {
 445                 ret = smb_krb5_copy_data_contents(&cred_data,
 446                                                   cred_blob->data,
 447                                                   cred_blob->length);
 448                 if (ret != 0) {
 449                         smb_krb5_free_data_contents(context, &logon_data);
 450                         return ret;
 451                 }
 452         }
 453
 454         ZERO_STRUCT(upn_data);
 455         if (upn_blob != NULL) {
 456                 ret = smb_krb5_copy_data_contents(&upn_data,
 457                                                   upn_blob->data,
 458                                                   upn_blob->length);
 459                 if (ret != 0) {
 460                         smb_krb5_free_data_contents(context, &logon_data);
 461                         smb_krb5_free_data_contents(context, &cred_data);
 462                         return ret;
 463                 }
 464         }
 465
 466         ZERO_STRUCT(deleg_data);
 467         if (deleg_blob != NULL) {
 468                 ret = smb_krb5_copy_data_contents(&deleg_data,
 469                                                   deleg_blob->data,
 470                                                   deleg_blob->length);
 471                 if (ret != 0) {
 472                         smb_krb5_free_data_contents(context, &logon_data);
 473                         smb_krb5_free_data_contents(context, &cred_data);
 474                         smb_krb5_free_data_contents(context, &upn_data);
 475                         return ret;
 476                 }
 477         }
 478
 479         ret = krb5_pac_init(context, pac);
 480         if (ret != 0) {
 481                 smb_krb5_free_data_contents(context, &logon_data);
 482                 smb_krb5_free_data_contents(context, &cred_data);
 483                 smb_krb5_free_data_contents(context, &upn_data);
 484                 smb_krb5_free_data_contents(context, &deleg_data);
 485                 return ret;
 486         }
 487
 488         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &logon_data);
 489         smb_krb5_free_data_contents(context, &logon_data);
 490         if (ret != 0) {
 491                 smb_krb5_free_data_contents(context, &upn_data);
 492                 smb_krb5_free_data_contents(context, &cred_data);
 493                 smb_krb5_free_data_contents(context, &deleg_data);
 494                 return ret;
 495         }
 496
 497         if (cred_blob != NULL) {
 498                 ret = krb5_pac_add_buffer(context, *pac,
 499                                           PAC_TYPE_CREDENTIAL_INFO,
 500                                           &cred_data);
 501                 smb_krb5_free_data_contents(context, &cred_data);
 502                 if (ret != 0) {
 503                         smb_krb5_free_data_contents(context, &upn_data);
 504                         smb_krb5_free_data_contents(context, &deleg_data);
 505                         return ret;
 506                 }
 507         }
 508
 509 #ifdef SAMBA4_USES_HEIMDAL
 510         /*
 511          * null_data will be filled by the generic KDC code in the caller
 512          * here we just add it in order to have it before
 513          * PAC_TYPE_UPN_DNS_INFO
 514          *
 515          * Not needed with MIT Kerberos - asn
 516          */
 517         ret = krb5_pac_add_buffer(context, *pac,
 518                                   PAC_TYPE_LOGON_NAME,
 519                                   &null_data);
 520         if (ret != 0) {
 521                 smb_krb5_free_data_contents(context, &upn_data);
 522                 smb_krb5_free_data_contents(context, &deleg_data);
 523                 return ret;
 524         }
 525 #endif
 526
 527         if (upn_blob != NULL) {
 528                 ret = krb5_pac_add_buffer(context, *pac,
 529                                           PAC_TYPE_UPN_DNS_INFO,
 530                                           &upn_data);
 531                 smb_krb5_free_data_contents(context, &upn_data);
 532                 if (ret != 0) {
 533                         smb_krb5_free_data_contents(context, &deleg_data);
 534                         return ret;
 535                 }
 536         }
 537
 538         if (deleg_blob != NULL) {
 539                 ret = krb5_pac_add_buffer(context, *pac,
 540                                           PAC_TYPE_CONSTRAINED_DELEGATION,
 541                                           &deleg_data);
 542                 smb_krb5_free_data_contents(context, &deleg_data);
 543                 if (ret != 0) {
 544                         return ret;
 545                 }
 546         }
 547
 548         return ret;
 549 }
 550
 551 bool samba_princ_needs_pac(struct samba_kdc_entry *skdc_entry)
 552 {
 553
 554         uint32_t userAccountControl;
 555
 556         /* The service account may be set not to want the PAC */
 557         userAccountControl = ldb_msg_find_attr_as_uint(skdc_entry->msg, "userAccountControl", 0);
 558         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 559                 return false;
 560         }
 561
 562         return true;
 563 }
 564
 565 /* Was the krbtgt in this DB (ie, should we check the incoming signature) and was it an RODC */
 566 int samba_krbtgt_is_in_db(struct samba_kdc_entry *p,
 567                           bool *is_in_db,
 568                           bool *is_untrusted)
 569 {
 570         NTSTATUS status;
 571         int rodc_krbtgt_number, trust_direction;
 572         uint32_t rid;
 573
 574         TALLOC_CTX *mem_ctx = talloc_new(NULL);
 575         if (!mem_ctx) {
 576                 return ENOMEM;
 577         }
 578
 579         trust_direction = ldb_msg_find_attr_as_int(p->msg, "trustDirection", 0);
 580
 581         if (trust_direction != 0) {
 582                 /* Domain trust - we cannot check the sig, but we trust it for a correct PAC
 583
 584                    This is exactly where we should flag for SID
 585                    validation when we do inter-foreest trusts
 586                  */
 587                 talloc_free(mem_ctx);
 588                 *is_untrusted = false;
 589                 *is_in_db = false;
 590                 return 0;
 591         }
 592
 593         /* The lack of password controls etc applies to krbtgt by
 594          * virtue of being that particular RID */
 595         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, p->msg, "objectSid"), NULL, &rid);
 596
 597         if (!NT_STATUS_IS_OK(status)) {
 598                 talloc_free(mem_ctx);
 599                 return EINVAL;
 600         }
 601
 602         rodc_krbtgt_number = ldb_msg_find_attr_as_int(p->msg, "msDS-SecondaryKrbTgtNumber", -1);
 603
 604         if (p->kdc_db_ctx->my_krbtgt_number == 0) {
 605                 if (rid == DOMAIN_RID_KRBTGT) {
 606                         *is_untrusted = false;
 607                         *is_in_db = true;
 608                         talloc_free(mem_ctx);
 609                         return 0;
 610                 } else if (rodc_krbtgt_number != -1) {
 611                         *is_in_db = true;
 612                         *is_untrusted = true;
 613                         talloc_free(mem_ctx);
 614                         return 0;
 615                 }
 616         } else if ((rid != DOMAIN_RID_KRBTGT) && (rodc_krbtgt_number == p->kdc_db_ctx->my_krbtgt_number)) {
 617                 talloc_free(mem_ctx);
 618                 *is_untrusted = false;
 619                 *is_in_db = true;
 620                 return 0;
 621         } else if (rid == DOMAIN_RID_KRBTGT) {
 622                 /* krbtgt viewed from an RODC */
 623                 talloc_free(mem_ctx);
 624                 *is_untrusted = false;
 625                 *is_in_db = false;
 626                 return 0;
 627         }
 628
 629         /* Another RODC */
 630         talloc_free(mem_ctx);
 631         *is_untrusted = true;
 632         *is_in_db = false;
 633         return 0;
 634 }
 635
 636 NTSTATUS samba_kdc_get_pac_blobs(TALLOC_CTX *mem_ctx,
 637                                  struct samba_kdc_entry *p,
 638                                  DATA_BLOB **_logon_info_blob,
 639                                  DATA_BLOB **_cred_ndr_blob,
 640                                  DATA_BLOB **_upn_info_blob)
 641 {
 642         struct auth_user_info_dc *user_info_dc;
 643         DATA_BLOB *logon_blob = NULL;
 644         DATA_BLOB *cred_blob = NULL;
 645         DATA_BLOB *upn_blob = NULL;
 646         NTSTATUS nt_status;
 647
 648         *_logon_info_blob = NULL;
 649         if (_cred_ndr_blob != NULL) {
 650                 *_cred_ndr_blob = NULL;
 651         }
 652         *_upn_info_blob = NULL;
 653
 654         /* The user account may be set not to want the PAC */
 655         if ( ! samba_princ_needs_pac(p)) {
 656                 return NT_STATUS_OK;
 657         }
 658
 659         logon_blob = talloc_zero(mem_ctx, DATA_BLOB);
 660         if (logon_blob == NULL) {
 661                 return NT_STATUS_NO_MEMORY;
 662         }
 663
 664         if (_cred_ndr_blob != NULL) {
 665                 cred_blob = talloc_zero(mem_ctx, DATA_BLOB);
 666                 if (cred_blob == NULL) {
 667                         return NT_STATUS_NO_MEMORY;
 668                 }
 669         }
 670
 671         upn_blob = talloc_zero(mem_ctx, DATA_BLOB);
 672         if (upn_blob == NULL) {
 673                 return NT_STATUS_NO_MEMORY;
 674         }
 675
 676         nt_status = authsam_make_user_info_dc(mem_ctx, p->kdc_db_ctx->samdb,
 677                                              lpcfg_netbios_name(p->kdc_db_ctx->lp_ctx),
 678                                              lpcfg_sam_name(p->kdc_db_ctx->lp_ctx),
 679                                              lpcfg_sam_dnsname(p->kdc_db_ctx->lp_ctx),
 680                                              p->realm_dn,
 681                                              p->msg,
 682                                              data_blob(NULL, 0),
 683                                              data_blob(NULL, 0),
 684                                              &user_info_dc);
 685         if (!NT_STATUS_IS_OK(nt_status)) {
 686                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 687                           nt_errstr(nt_status)));
 688                 return nt_status;
 689         }
 690
 691         nt_status = samba_get_logon_info_pac_blob(logon_blob,
 692                                                   user_info_dc,
 693                                                   logon_blob);
 694         if (!NT_STATUS_IS_OK(nt_status)) {
 695                 DEBUG(0, ("Building PAC LOGON INFO failed: %s\n",
 696                           nt_errstr(nt_status)));
 697                 return nt_status;
 698         }
 699
 700         if (cred_blob != NULL) {
 701                 nt_status = samba_get_cred_info_ndr_blob(cred_blob,
 702                                                          p->msg,
 703                                                          cred_blob);
 704                 if (!NT_STATUS_IS_OK(nt_status)) {
 705                         DEBUG(0, ("Building PAC CRED INFO failed: %s\n",
 706                                   nt_errstr(nt_status)));
 707                         return nt_status;
 708                 }
 709         }
 710
 711         nt_status = samba_get_upn_info_pac_blob(upn_blob,
 712                                                 user_info_dc,
 713                                                 upn_blob);
 714         if (!NT_STATUS_IS_OK(nt_status)) {
 715                 DEBUG(0, ("Building PAC UPN INFO failed: %s\n",
 716                           nt_errstr(nt_status)));
 717                 return nt_status;
 718         }
 719
 720         TALLOC_FREE(user_info_dc);
 721         *_logon_info_blob = logon_blob;
 722         if (_cred_ndr_blob != NULL) {
 723                 *_cred_ndr_blob = cred_blob;
 724         }
 725         *_upn_info_blob = upn_blob;
 726         return NT_STATUS_OK;
 727 }
 728
 729 NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
 730                                 struct samba_kdc_entry *p,
 731                                 DATA_BLOB **_logon_info_blob)
 732 {
 733         NTSTATUS nt_status;
 734         DATA_BLOB *upn_blob = NULL;
 735
 736         nt_status = samba_kdc_get_pac_blobs(mem_ctx, p,
 737                                             _logon_info_blob,
 738                                             NULL, /* cred_blob */
 739                                             &upn_blob);
 740         if (!NT_STATUS_IS_OK(nt_status)) {
 741                 return nt_status;
 742         }
 743
 744         TALLOC_FREE(upn_blob);
 745         return NT_STATUS_OK;
 746 }
 747
 748 NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
 749                                    krb5_context context,
 750                                    struct samba_kdc_entry *krbtgt,
 751                                    struct samba_kdc_entry *server,
 752                                    const krb5_pac pac, DATA_BLOB *pac_blob,
 753                                    struct PAC_SIGNATURE_DATA *pac_srv_sig,
 754                                    struct PAC_SIGNATURE_DATA *pac_kdc_sig)
 755 {
 756         struct auth_user_info_dc *user_info_dc;
 757         krb5_error_code ret;
 758         NTSTATUS nt_status;
 759
 760         ret = kerberos_pac_to_user_info_dc(mem_ctx, pac,
 761                                            context, &user_info_dc, pac_srv_sig, pac_kdc_sig);
 762         if (ret) {
 763                 return NT_STATUS_UNSUCCESSFUL;
 764         }
 765
 766         /*
 767          * We need to expand group memberships within our local domain,
 768          * as the token might be generated by a trusted domain.
 769          */
 770         nt_status = authsam_update_user_info_dc(mem_ctx,
 771                                                 krbtgt->kdc_db_ctx->samdb,
 772                                                 user_info_dc);
 773         if (!NT_STATUS_IS_OK(nt_status)) {
 774                 return nt_status;
 775         }
 776
 777         nt_status = samba_get_logon_info_pac_blob(mem_ctx,
 778                                                   user_info_dc, pac_blob);
 779
 780         return nt_status;
 781 }
 782
 783 NTSTATUS samba_kdc_update_delegation_info_blob(TALLOC_CTX *mem_ctx,
 784                                 krb5_context context,
 785                                 const krb5_pac pac,
 786                                 const krb5_principal server_principal,
 787                                 const krb5_principal proxy_principal,
 788                                 DATA_BLOB *new_blob)
 789 {
 790         krb5_data old_data;
 791         DATA_BLOB old_blob;
 792         krb5_error_code ret;
 793         NTSTATUS nt_status;
 794         enum ndr_err_code ndr_err;
 795         union PAC_INFO info;
 796         struct PAC_CONSTRAINED_DELEGATION _d;
 797         struct PAC_CONSTRAINED_DELEGATION *d = NULL;
 798         char *server = NULL;
 799         char *proxy = NULL;
 800         uint32_t i;
 801         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 802
 803         if (tmp_ctx == NULL) {
 804                 return NT_STATUS_NO_MEMORY;
 805         }
 806
 807         ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_CONSTRAINED_DELEGATION, &old_data);
 808         if (ret == ENOENT) {
 809                 ZERO_STRUCT(old_data);
 810         } else if (ret) {
 811                 talloc_free(tmp_ctx);
 812                 return NT_STATUS_UNSUCCESSFUL;
 813         }
 814
 815         old_blob.length = old_data.length;
 816         old_blob.data = (uint8_t *)old_data.data;
 817
 818         ZERO_STRUCT(info);
 819         if (old_blob.length > 0) {
 820                 ndr_err = ndr_pull_union_blob(&old_blob, mem_ctx,
 821                                 &info, PAC_TYPE_CONSTRAINED_DELEGATION,
 822                                 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
 823                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 824                         smb_krb5_free_data_contents(context, &old_data);
 825                         nt_status = ndr_map_error2ntstatus(ndr_err);
 826                         DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 827                         talloc_free(tmp_ctx);
 828                         return nt_status;
 829                 }
 830         } else {
 831                 ZERO_STRUCT(_d);
 832                 info.constrained_delegation.info = &_d;
 833         }
 834         smb_krb5_free_data_contents(context, &old_data);
 835
 836         ret = krb5_unparse_name_flags(context, server_principal,
 837                                       KRB5_PRINCIPAL_UNPARSE_NO_REALM, &server);
 838         if (ret) {
 839                 talloc_free(tmp_ctx);
 840                 return NT_STATUS_INTERNAL_ERROR;
 841         }
 842
 843         ret = krb5_unparse_name(context, proxy_principal, &proxy);
 844         if (ret) {
 845                 SAFE_FREE(server);
 846                 talloc_free(tmp_ctx);
 847                 return NT_STATUS_INTERNAL_ERROR;
 848         }
 849
 850         d = info.constrained_delegation.info;
 851         i = d->num_transited_services;
 852         d->proxy_target.string = server;
 853         d->transited_services = talloc_realloc(mem_ctx, d->transited_services,
 854                                                struct lsa_String, i + 1);
 855         d->transited_services[i].string = proxy;
 856         d->num_transited_services = i + 1;
 857
 858         ndr_err = ndr_push_union_blob(new_blob, mem_ctx,
 859                                 &info, PAC_TYPE_CONSTRAINED_DELEGATION,
 860                                 (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
 861         SAFE_FREE(server);
 862         SAFE_FREE(proxy);
 863         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 864                 smb_krb5_free_data_contents(context, &old_data);
 865                 nt_status = ndr_map_error2ntstatus(ndr_err);
 866                 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 867                 talloc_free(tmp_ctx);
 868                 return nt_status;
 869         }
 870
 871         talloc_free(tmp_ctx);
 872         return NT_STATUS_OK;
 873 }
 874
 875 /* function to map policy errors */
 876 krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
 877 {
 878         krb5_error_code ret;
 879
 880         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 881                 ret = KRB5KDC_ERR_KEY_EXP;
 882         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 883                 ret = KRB5KDC_ERR_KEY_EXP;
 884         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 885                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 886         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 887                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 888         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 889                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 890         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 891                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 892         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 893                 ret = KRB5KDC_ERR_POLICY;
 894         else
 895                 ret = KRB5KDC_ERR_POLICY;
 896
 897         return ret;
 898 }
 899
 900 /* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
 901  * for consistency */
 902 NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
 903                                        const char *client_name,
 904                                        const char *workstation,
 905                                        bool password_change)
 906 {
 907         TALLOC_CTX *tmp_ctx;
 908         NTSTATUS nt_status;
 909
 910         tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
 911         if (!tmp_ctx) {
 912                 return NT_STATUS_NO_MEMORY;
 913         }
 914
 915         /* we allow all kinds of trusts here */
 916         nt_status = authsam_account_ok(tmp_ctx,
 917                                        kdc_entry->kdc_db_ctx->samdb,
 918                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 919                                        MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 920                                        kdc_entry->realm_dn, kdc_entry->msg,
 921                                        workstation, client_name,
 922                                        true, password_change);
 923
 924         talloc_free(tmp_ctx);
 925         return nt_status;
 926 }