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_data null_data;
 424         krb5_error_code ret;
 425
 426         ZERO_STRUCT(null_data);
 427
 428         /* The user account may be set not to want the PAC */
 429         if (logon_blob == NULL) {
 430                 return 0;
 431         }
 432
 433         ret = smb_krb5_copy_data_contents(&logon_data,
 434                                           logon_blob->data,
 435                                           logon_blob->length);
 436         if (ret != 0) {
 437                 return ret;
 438         }
 439
 440         ZERO_STRUCT(cred_data);
 441         if (cred_blob != NULL) {
 442                 ret = smb_krb5_copy_data_contents(&cred_data,
 443                                                   cred_blob->data,
 444                                                   cred_blob->length);
 445                 if (ret != 0) {
 446                         smb_krb5_free_data_contents(context, &logon_data);
 447                         return ret;
 448                 }
 449         }
 450
 451         ZERO_STRUCT(upn_data);
 452         if (upn_blob != NULL) {
 453                 ret = smb_krb5_copy_data_contents(&upn_data,
 454                                                   upn_blob->data,
 455                                                   upn_blob->length);
 456                 if (ret != 0) {
 457                         smb_krb5_free_data_contents(context, &logon_data);
 458                         smb_krb5_free_data_contents(context, &cred_data);
 459                         return ret;
 460                 }
 461         }
 462
 463         ZERO_STRUCT(deleg_data);
 464         if (deleg_blob != NULL) {
 465                 ret = smb_krb5_copy_data_contents(&deleg_data,
 466                                                   deleg_blob->data,
 467                                                   deleg_blob->length);
 468                 if (ret != 0) {
 469                         smb_krb5_free_data_contents(context, &logon_data);
 470                         smb_krb5_free_data_contents(context, &cred_data);
 471                         smb_krb5_free_data_contents(context, &upn_data);
 472                         return ret;
 473                 }
 474         }
 475
 476         ret = krb5_pac_init(context, pac);
 477         if (ret != 0) {
 478                 smb_krb5_free_data_contents(context, &logon_data);
 479                 smb_krb5_free_data_contents(context, &cred_data);
 480                 smb_krb5_free_data_contents(context, &upn_data);
 481                 smb_krb5_free_data_contents(context, &deleg_data);
 482                 return ret;
 483         }
 484
 485         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &logon_data);
 486         smb_krb5_free_data_contents(context, &logon_data);
 487         if (ret != 0) {
 488                 smb_krb5_free_data_contents(context, &upn_data);
 489                 smb_krb5_free_data_contents(context, &cred_data);
 490                 smb_krb5_free_data_contents(context, &deleg_data);
 491                 return ret;
 492         }
 493
 494         if (cred_blob != NULL) {
 495                 ret = krb5_pac_add_buffer(context, *pac,
 496                                           PAC_TYPE_CREDENTIAL_INFO,
 497                                           &cred_data);
 498                 smb_krb5_free_data_contents(context, &cred_data);
 499                 if (ret != 0) {
 500                         smb_krb5_free_data_contents(context, &upn_data);
 501                         smb_krb5_free_data_contents(context, &deleg_data);
 502                         return ret;
 503                 }
 504         }
 505
 506         /*
 507          * null_data will be filled by the generic KDC code in the caller
 508          * here we just add it in order to have it before
 509          * PAC_TYPE_UPN_DNS_INFO
 510          */
 511         ret = krb5_pac_add_buffer(context, *pac,
 512                                   PAC_TYPE_LOGON_NAME,
 513                                   &null_data);
 514         if (ret != 0) {
 515                 smb_krb5_free_data_contents(context, &upn_data);
 516                 smb_krb5_free_data_contents(context, &deleg_data);
 517                 return ret;
 518         }
 519
 520         if (upn_blob != NULL) {
 521                 ret = krb5_pac_add_buffer(context, *pac,
 522                                           PAC_TYPE_UPN_DNS_INFO,
 523                                           &upn_data);
 524                 smb_krb5_free_data_contents(context, &upn_data);
 525                 if (ret != 0) {
 526                         smb_krb5_free_data_contents(context, &deleg_data);
 527                         return ret;
 528                 }
 529         }
 530
 531         if (deleg_blob != NULL) {
 532                 ret = krb5_pac_add_buffer(context, *pac,
 533                                           PAC_TYPE_CONSTRAINED_DELEGATION,
 534                                           &deleg_data);
 535                 smb_krb5_free_data_contents(context, &deleg_data);
 536                 if (ret != 0) {
 537                         return ret;
 538                 }
 539         }
 540
 541         return ret;
 542 }
 543
 544 bool samba_princ_needs_pac(struct samba_kdc_entry *skdc_entry)
 545 {
 546
 547         uint32_t userAccountControl;
 548
 549         /* The service account may be set not to want the PAC */
 550         userAccountControl = ldb_msg_find_attr_as_uint(skdc_entry->msg, "userAccountControl", 0);
 551         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 552                 return false;
 553         }
 554
 555         return true;
 556 }
 557
 558 /* Was the krbtgt in this DB (ie, should we check the incoming signature) and was it an RODC */
 559 int samba_krbtgt_is_in_db(struct samba_kdc_entry *p,
 560                           bool *is_in_db,
 561                           bool *is_untrusted)
 562 {
 563         NTSTATUS status;
 564         int rodc_krbtgt_number, trust_direction;
 565         uint32_t rid;
 566
 567         TALLOC_CTX *mem_ctx = talloc_new(NULL);
 568         if (!mem_ctx) {
 569                 return ENOMEM;
 570         }
 571
 572         trust_direction = ldb_msg_find_attr_as_int(p->msg, "trustDirection", 0);
 573
 574         if (trust_direction != 0) {
 575                 /* Domain trust - we cannot check the sig, but we trust it for a correct PAC
 576
 577                    This is exactly where we should flag for SID
 578                    validation when we do inter-foreest trusts
 579                  */
 580                 talloc_free(mem_ctx);
 581                 *is_untrusted = false;
 582                 *is_in_db = false;
 583                 return 0;
 584         }
 585
 586         /* The lack of password controls etc applies to krbtgt by
 587          * virtue of being that particular RID */
 588         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, p->msg, "objectSid"), NULL, &rid);
 589
 590         if (!NT_STATUS_IS_OK(status)) {
 591                 talloc_free(mem_ctx);
 592                 return EINVAL;
 593         }
 594
 595         rodc_krbtgt_number = ldb_msg_find_attr_as_int(p->msg, "msDS-SecondaryKrbTgtNumber", -1);
 596
 597         if (p->kdc_db_ctx->my_krbtgt_number == 0) {
 598                 if (rid == DOMAIN_RID_KRBTGT) {
 599                         *is_untrusted = false;
 600                         *is_in_db = true;
 601                         talloc_free(mem_ctx);
 602                         return 0;
 603                 } else if (rodc_krbtgt_number != -1) {
 604                         *is_in_db = true;
 605                         *is_untrusted = true;
 606                         talloc_free(mem_ctx);
 607                         return 0;
 608                 }
 609         } else if ((rid != DOMAIN_RID_KRBTGT) && (rodc_krbtgt_number == p->kdc_db_ctx->my_krbtgt_number)) {
 610                 talloc_free(mem_ctx);
 611                 *is_untrusted = false;
 612                 *is_in_db = true;
 613                 return 0;
 614         } else if (rid == DOMAIN_RID_KRBTGT) {
 615                 /* krbtgt viewed from an RODC */
 616                 talloc_free(mem_ctx);
 617                 *is_untrusted = false;
 618                 *is_in_db = false;
 619                 return 0;
 620         }
 621
 622         /* Another RODC */
 623         talloc_free(mem_ctx);
 624         *is_untrusted = true;
 625         *is_in_db = false;
 626         return 0;
 627 }
 628
 629 NTSTATUS samba_kdc_get_pac_blobs(TALLOC_CTX *mem_ctx,
 630                                  struct samba_kdc_entry *p,
 631                                  DATA_BLOB **_logon_info_blob,
 632                                  DATA_BLOB **_cred_ndr_blob,
 633                                  DATA_BLOB **_upn_info_blob)
 634 {
 635         struct auth_user_info_dc *user_info_dc;
 636         DATA_BLOB *logon_blob = NULL;
 637         DATA_BLOB *cred_blob = NULL;
 638         DATA_BLOB *upn_blob = NULL;
 639         NTSTATUS nt_status;
 640
 641         *_logon_info_blob = NULL;
 642         if (_cred_ndr_blob != NULL) {
 643                 *_cred_ndr_blob = NULL;
 644         }
 645         *_upn_info_blob = NULL;
 646
 647         /* The user account may be set not to want the PAC */
 648         if ( ! samba_princ_needs_pac(p)) {
 649                 return NT_STATUS_OK;
 650         }
 651
 652         logon_blob = talloc_zero(mem_ctx, DATA_BLOB);
 653         if (logon_blob == NULL) {
 654                 return NT_STATUS_NO_MEMORY;
 655         }
 656
 657         if (_cred_ndr_blob != NULL) {
 658                 cred_blob = talloc_zero(mem_ctx, DATA_BLOB);
 659                 if (cred_blob == NULL) {
 660                         return NT_STATUS_NO_MEMORY;
 661                 }
 662         }
 663
 664         upn_blob = talloc_zero(mem_ctx, DATA_BLOB);
 665         if (upn_blob == NULL) {
 666                 return NT_STATUS_NO_MEMORY;
 667         }
 668
 669         nt_status = authsam_make_user_info_dc(mem_ctx, p->kdc_db_ctx->samdb,
 670                                              lpcfg_netbios_name(p->kdc_db_ctx->lp_ctx),
 671                                              lpcfg_sam_name(p->kdc_db_ctx->lp_ctx),
 672                                              lpcfg_sam_dnsname(p->kdc_db_ctx->lp_ctx),
 673                                              p->realm_dn,
 674                                              p->msg,
 675                                              data_blob(NULL, 0),
 676                                              data_blob(NULL, 0),
 677                                              &user_info_dc);
 678         if (!NT_STATUS_IS_OK(nt_status)) {
 679                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 680                           nt_errstr(nt_status)));
 681                 return nt_status;
 682         }
 683
 684         nt_status = samba_get_logon_info_pac_blob(logon_blob,
 685                                                   user_info_dc,
 686                                                   logon_blob);
 687         if (!NT_STATUS_IS_OK(nt_status)) {
 688                 DEBUG(0, ("Building PAC LOGON INFO failed: %s\n",
 689                           nt_errstr(nt_status)));
 690                 return nt_status;
 691         }
 692
 693         if (cred_blob != NULL) {
 694                 nt_status = samba_get_cred_info_ndr_blob(cred_blob,
 695                                                          p->msg,
 696                                                          cred_blob);
 697                 if (!NT_STATUS_IS_OK(nt_status)) {
 698                         DEBUG(0, ("Building PAC CRED INFO failed: %s\n",
 699                                   nt_errstr(nt_status)));
 700                         return nt_status;
 701                 }
 702         }
 703
 704         nt_status = samba_get_upn_info_pac_blob(upn_blob,
 705                                                 user_info_dc,
 706                                                 upn_blob);
 707         if (!NT_STATUS_IS_OK(nt_status)) {
 708                 DEBUG(0, ("Building PAC UPN INFO failed: %s\n",
 709                           nt_errstr(nt_status)));
 710                 return nt_status;
 711         }
 712
 713         TALLOC_FREE(user_info_dc);
 714         *_logon_info_blob = logon_blob;
 715         if (_cred_ndr_blob != NULL) {
 716                 *_cred_ndr_blob = cred_blob;
 717         }
 718         *_upn_info_blob = upn_blob;
 719         return NT_STATUS_OK;
 720 }
 721
 722 NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
 723                                 struct samba_kdc_entry *p,
 724                                 DATA_BLOB **_logon_info_blob)
 725 {
 726         NTSTATUS nt_status;
 727         DATA_BLOB *upn_blob = NULL;
 728
 729         nt_status = samba_kdc_get_pac_blobs(mem_ctx, p,
 730                                             _logon_info_blob,
 731                                             NULL, /* cred_blob */
 732                                             &upn_blob);
 733         if (!NT_STATUS_IS_OK(nt_status)) {
 734                 return nt_status;
 735         }
 736
 737         TALLOC_FREE(upn_blob);
 738         return NT_STATUS_OK;
 739 }
 740
 741 NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
 742                                    krb5_context context,
 743                                    const krb5_pac pac, DATA_BLOB *pac_blob,
 744                                    struct PAC_SIGNATURE_DATA *pac_srv_sig,
 745                                    struct PAC_SIGNATURE_DATA *pac_kdc_sig)
 746 {
 747         struct auth_user_info_dc *user_info_dc;
 748         krb5_error_code ret;
 749         NTSTATUS nt_status;
 750
 751         ret = kerberos_pac_to_user_info_dc(mem_ctx, pac,
 752                                            context, &user_info_dc, pac_srv_sig, pac_kdc_sig);
 753         if (ret) {
 754                 return NT_STATUS_UNSUCCESSFUL;
 755         }
 756
 757         nt_status = samba_get_logon_info_pac_blob(mem_ctx,
 758                                                   user_info_dc, pac_blob);
 759
 760         return nt_status;
 761 }
 762
 763 NTSTATUS samba_kdc_update_delegation_info_blob(TALLOC_CTX *mem_ctx,
 764                                 krb5_context context,
 765                                 const krb5_pac pac,
 766                                 const krb5_principal server_principal,
 767                                 const krb5_principal proxy_principal,
 768                                 DATA_BLOB *new_blob)
 769 {
 770         krb5_data old_data;
 771         DATA_BLOB old_blob;
 772         krb5_error_code ret;
 773         NTSTATUS nt_status;
 774         enum ndr_err_code ndr_err;
 775         union PAC_INFO info;
 776         struct PAC_CONSTRAINED_DELEGATION _d;
 777         struct PAC_CONSTRAINED_DELEGATION *d = NULL;
 778         char *server = NULL;
 779         char *proxy = NULL;
 780         uint32_t i;
 781         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 782
 783         if (tmp_ctx == NULL) {
 784                 return NT_STATUS_NO_MEMORY;
 785         }
 786
 787         ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_CONSTRAINED_DELEGATION, &old_data);
 788         if (ret == ENOENT) {
 789                 ZERO_STRUCT(old_data);
 790         } else if (ret) {
 791                 talloc_free(tmp_ctx);
 792                 return NT_STATUS_UNSUCCESSFUL;
 793         }
 794
 795         old_blob.length = old_data.length;
 796         old_blob.data = (uint8_t *)old_data.data;
 797
 798         ZERO_STRUCT(info);
 799         if (old_blob.length > 0) {
 800                 ndr_err = ndr_pull_union_blob(&old_blob, mem_ctx,
 801                                 &info, PAC_TYPE_CONSTRAINED_DELEGATION,
 802                                 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
 803                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 804                         smb_krb5_free_data_contents(context, &old_data);
 805                         nt_status = ndr_map_error2ntstatus(ndr_err);
 806                         DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 807                         talloc_free(tmp_ctx);
 808                         return nt_status;
 809                 }
 810         } else {
 811                 ZERO_STRUCT(_d);
 812                 info.constrained_delegation.info = &_d;
 813         }
 814         smb_krb5_free_data_contents(context, &old_data);
 815
 816         ret = krb5_unparse_name(context, server_principal, &server);
 817         if (ret) {
 818                 talloc_free(tmp_ctx);
 819                 return NT_STATUS_INTERNAL_ERROR;
 820         }
 821
 822         ret = krb5_unparse_name_flags(context, proxy_principal,
 823                                       KRB5_PRINCIPAL_UNPARSE_NO_REALM, &proxy);
 824         if (ret) {
 825                 SAFE_FREE(server);
 826                 talloc_free(tmp_ctx);
 827                 return NT_STATUS_INTERNAL_ERROR;
 828         }
 829
 830         d = info.constrained_delegation.info;
 831         i = d->num_transited_services;
 832         d->proxy_target.string = server;
 833         d->transited_services = talloc_realloc(mem_ctx, d->transited_services,
 834                                                struct lsa_String, i + 1);
 835         d->transited_services[i].string = proxy;
 836         d->num_transited_services = i + 1;
 837
 838         ndr_err = ndr_push_union_blob(new_blob, mem_ctx,
 839                                 &info, PAC_TYPE_CONSTRAINED_DELEGATION,
 840                                 (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
 841         SAFE_FREE(server);
 842         SAFE_FREE(proxy);
 843         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 844                 smb_krb5_free_data_contents(context, &old_data);
 845                 nt_status = ndr_map_error2ntstatus(ndr_err);
 846                 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 847                 talloc_free(tmp_ctx);
 848                 return nt_status;
 849         }
 850
 851         talloc_free(tmp_ctx);
 852         return NT_STATUS_OK;
 853 }
 854
 855 /* function to map policy errors */
 856 krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
 857 {
 858         krb5_error_code ret;
 859
 860         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 861                 ret = KRB5KDC_ERR_KEY_EXP;
 862         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 863                 ret = KRB5KDC_ERR_KEY_EXP;
 864         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 865                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 866         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 867                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 868         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 869                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 870         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 871                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 872         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 873                 ret = KRB5KDC_ERR_POLICY;
 874         else
 875                 ret = KRB5KDC_ERR_POLICY;
 876
 877         return ret;
 878 }
 879
 880 /* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
 881  * for consistency */
 882 NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
 883                                        const char *client_name,
 884                                        const char *workstation,
 885                                        bool password_change)
 886 {
 887         TALLOC_CTX *tmp_ctx;
 888         NTSTATUS nt_status;
 889
 890         tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
 891         if (!tmp_ctx) {
 892                 return NT_STATUS_NO_MEMORY;
 893         }
 894
 895         /* we allow all kinds of trusts here */
 896         nt_status = authsam_account_ok(tmp_ctx,
 897                                        kdc_entry->kdc_db_ctx->samdb,
 898                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 899                                        MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 900                                        kdc_entry->realm_dn, kdc_entry->msg,
 901                                        workstation, client_name,
 902                                        true, password_change);
 903
 904         talloc_free(tmp_ctx);
 905         return nt_status;
 906 }