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_pac_attrs_blob(TALLOC_CTX *mem_ctx,
 118                                   const krb5_boolean *pac_request,
 119                                   DATA_BLOB *pac_attrs_data)
 120 {
 121         union PAC_INFO pac_attrs;
 122         enum ndr_err_code ndr_err;
 123         NTSTATUS nt_status;
 124
 125         ZERO_STRUCT(pac_attrs);
 126
 127         *pac_attrs_data = data_blob_null;
 128
 129         /* Set the length of the flags in bits. */
 130         pac_attrs.attributes_info.flags_length = 2;
 131
 132         if (pac_request == NULL) {
 133                 pac_attrs.attributes_info.flags
 134                         |= PAC_ATTRIBUTE_FLAG_PAC_WAS_GIVEN_IMPLICITLY;
 135         } else if (*pac_request) {
 136                 pac_attrs.attributes_info.flags
 137                         |= PAC_ATTRIBUTE_FLAG_PAC_WAS_REQUESTED;
 138         }
 139
 140         ndr_err = ndr_push_union_blob(pac_attrs_data, mem_ctx, &pac_attrs,
 141                                       PAC_TYPE_ATTRIBUTES_INFO,
 142                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
 143         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 144                 nt_status = ndr_map_error2ntstatus(ndr_err);
 145                 DEBUG(1, ("PAC ATTRIBUTES_INFO (presig) push failed: %s\n",
 146                           nt_errstr(nt_status)));
 147                 return nt_status;
 148         }
 149
 150         return NT_STATUS_OK;
 151 }
 152
 153 static
 154 NTSTATUS samba_get_cred_info_ndr_blob(TALLOC_CTX *mem_ctx,
 155                                       const struct ldb_message *msg,
 156                                       DATA_BLOB *cred_blob)
 157 {
 158         enum ndr_err_code ndr_err;
 159         NTSTATUS nt_status;
 160         struct samr_Password *lm_hash = NULL;
 161         struct samr_Password *nt_hash = NULL;
 162         struct PAC_CREDENTIAL_NTLM_SECPKG ntlm_secpkg = {
 163                 .version = 0,
 164         };
 165         DATA_BLOB ntlm_blob = data_blob_null;
 166         struct PAC_CREDENTIAL_SUPPLEMENTAL_SECPKG secpkgs[1] = {{
 167                 .credential_size = 0,
 168         }};
 169         struct PAC_CREDENTIAL_DATA cred_data = {
 170                 .credential_count = 0,
 171         };
 172         struct PAC_CREDENTIAL_DATA_NDR cred_ndr;
 173
 174         ZERO_STRUCT(cred_ndr);
 175
 176         *cred_blob = data_blob_null;
 177
 178         lm_hash = samdb_result_hash(mem_ctx, msg, "dBCSPwd");
 179         if (lm_hash != NULL) {
 180                 bool zero = all_zero(lm_hash->hash, 16);
 181                 if (zero) {
 182                         lm_hash = NULL;
 183                 }
 184         }
 185         if (lm_hash != NULL) {
 186                 DEBUG(5, ("Passing LM password hash through credentials set\n"));
 187                 ntlm_secpkg.flags |= PAC_CREDENTIAL_NTLM_HAS_LM_HASH;
 188                 ntlm_secpkg.lm_password = *lm_hash;
 189                 ZERO_STRUCTP(lm_hash);
 190                 TALLOC_FREE(lm_hash);
 191         }
 192
 193         nt_hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
 194         if (nt_hash != NULL) {
 195                 bool zero = all_zero(nt_hash->hash, 16);
 196                 if (zero) {
 197                         nt_hash = NULL;
 198                 }
 199         }
 200         if (nt_hash != NULL) {
 201                 DEBUG(5, ("Passing LM password hash through credentials set\n"));
 202                 ntlm_secpkg.flags |= PAC_CREDENTIAL_NTLM_HAS_NT_HASH;
 203                 ntlm_secpkg.nt_password = *nt_hash;
 204                 ZERO_STRUCTP(nt_hash);
 205                 TALLOC_FREE(nt_hash);
 206         }
 207
 208         if (ntlm_secpkg.flags == 0) {
 209                 return NT_STATUS_OK;
 210         }
 211
 212 #ifdef DEBUG_PASSWORD
 213         if (DEBUGLVL(11)) {
 214                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_NTLM_SECPKG, &ntlm_secpkg);
 215         }
 216 #endif
 217
 218         ndr_err = ndr_push_struct_blob(&ntlm_blob, mem_ctx, &ntlm_secpkg,
 219                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_NTLM_SECPKG);
 220         ZERO_STRUCT(ntlm_secpkg);
 221         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 222                 nt_status = ndr_map_error2ntstatus(ndr_err);
 223                 DEBUG(1, ("PAC_CREDENTIAL_NTLM_SECPKG (presig) push failed: %s\n",
 224                           nt_errstr(nt_status)));
 225                 return nt_status;
 226         }
 227
 228         DEBUG(10, ("NTLM credential BLOB (len %zu) for user\n",
 229                   ntlm_blob.length));
 230         dump_data_pw("PAC_CREDENTIAL_NTLM_SECPKG",
 231                      ntlm_blob.data, ntlm_blob.length);
 232
 233         secpkgs[0].package_name.string = discard_const_p(char, "NTLM");
 234         secpkgs[0].credential_size = ntlm_blob.length;
 235         secpkgs[0].credential = ntlm_blob.data;
 236
 237         cred_data.credential_count = ARRAY_SIZE(secpkgs);
 238         cred_data.credentials = secpkgs;
 239
 240 #ifdef DEBUG_PASSWORD
 241         if (DEBUGLVL(11)) {
 242                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_DATA, &cred_data);
 243         }
 244 #endif
 245
 246         cred_ndr.ctr.data = &cred_data;
 247
 248 #ifdef DEBUG_PASSWORD
 249         if (DEBUGLVL(11)) {
 250                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_DATA_NDR, &cred_ndr);
 251         }
 252 #endif
 253
 254         ndr_err = ndr_push_struct_blob(cred_blob, mem_ctx, &cred_ndr,
 255                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_DATA_NDR);
 256         data_blob_clear(&ntlm_blob);
 257         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 258                 nt_status = ndr_map_error2ntstatus(ndr_err);
 259                 DEBUG(1, ("PAC_CREDENTIAL_DATA_NDR (presig) push failed: %s\n",
 260                           nt_errstr(nt_status)));
 261                 return nt_status;
 262         }
 263
 264         DEBUG(10, ("Created credential BLOB (len %zu) for user\n",
 265                   cred_blob->length));
 266         dump_data_pw("PAC_CREDENTIAL_DATA_NDR",
 267                      cred_blob->data, cred_blob->length);
 268
 269         return NT_STATUS_OK;
 270 }
 271
 272 #ifdef SAMBA4_USES_HEIMDAL
 273 krb5_error_code samba_kdc_encrypt_pac_credentials(krb5_context context,
 274                                                   const krb5_keyblock *pkreplykey,
 275                                                   const DATA_BLOB *cred_ndr_blob,
 276                                                   TALLOC_CTX *mem_ctx,
 277                                                   DATA_BLOB *cred_info_blob)
 278 {
 279         krb5_crypto cred_crypto;
 280         krb5_enctype cred_enctype;
 281         krb5_data cred_ndr_crypt;
 282         struct PAC_CREDENTIAL_INFO pac_cred_info = { .version = 0, };
 283         krb5_error_code ret;
 284         const char *krb5err;
 285         enum ndr_err_code ndr_err;
 286         NTSTATUS nt_status;
 287
 288         *cred_info_blob = data_blob_null;
 289
 290         ret = krb5_crypto_init(context, pkreplykey, ETYPE_NULL,
 291                                &cred_crypto);
 292         if (ret != 0) {
 293                 krb5err = krb5_get_error_message(context, ret);
 294                 DEBUG(1, ("Failed initializing cred data crypto: %s\n", krb5err));
 295                 krb5_free_error_message(context, krb5err);
 296                 return ret;
 297         }
 298
 299         ret = krb5_crypto_getenctype(context, cred_crypto, &cred_enctype);
 300         if (ret != 0) {
 301                 DEBUG(1, ("Failed getting crypto type for key\n"));
 302                 krb5_crypto_destroy(context, cred_crypto);
 303                 return ret;
 304         }
 305
 306         DEBUG(10, ("Plain cred_ndr_blob (len %zu)\n",
 307                   cred_ndr_blob->length));
 308         dump_data_pw("PAC_CREDENTIAL_DATA_NDR",
 309                      cred_ndr_blob->data, cred_ndr_blob->length);
 310
 311         ret = krb5_encrypt(context, cred_crypto,
 312                            KRB5_KU_OTHER_ENCRYPTED,
 313                            cred_ndr_blob->data, cred_ndr_blob->length,
 314                            &cred_ndr_crypt);
 315         krb5_crypto_destroy(context, cred_crypto);
 316         if (ret != 0) {
 317                 krb5err = krb5_get_error_message(context, ret);
 318                 DEBUG(1, ("Failed crypt of cred data: %s\n", krb5err));
 319                 krb5_free_error_message(context, krb5err);
 320                 return ret;
 321         }
 322
 323         pac_cred_info.encryption_type = cred_enctype;
 324         pac_cred_info.encrypted_data.length = cred_ndr_crypt.length;
 325         pac_cred_info.encrypted_data.data = (uint8_t *)cred_ndr_crypt.data;
 326
 327         if (DEBUGLVL(10)) {
 328                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_INFO, &pac_cred_info);
 329         }
 330
 331         ndr_err = ndr_push_struct_blob(cred_info_blob, mem_ctx, &pac_cred_info,
 332                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_INFO);
 333         krb5_data_free(&cred_ndr_crypt);
 334         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 335                 nt_status = ndr_map_error2ntstatus(ndr_err);
 336                 DEBUG(1, ("PAC_CREDENTIAL_INFO (presig) push failed: %s\n",
 337                           nt_errstr(nt_status)));
 338                 return KRB5KDC_ERR_SVC_UNAVAILABLE;
 339         }
 340
 341         DEBUG(10, ("Encrypted credential BLOB (len %zu) with alg %d\n",
 342                   cred_info_blob->length, (int)pac_cred_info.encryption_type));
 343         dump_data_pw("PAC_CREDENTIAL_INFO",
 344                       cred_info_blob->data, cred_info_blob->length);
 345
 346         return 0;
 347 }
 348 #else /* SAMBA4_USES_HEIMDAL */
 349 krb5_error_code samba_kdc_encrypt_pac_credentials(krb5_context context,
 350                                                   const krb5_keyblock *pkreplykey,
 351                                                   const DATA_BLOB *cred_ndr_blob,
 352                                                   TALLOC_CTX *mem_ctx,
 353                                                   DATA_BLOB *cred_info_blob)
 354 {
 355         krb5_key cred_key;
 356         krb5_enctype cred_enctype;
 357         struct PAC_CREDENTIAL_INFO pac_cred_info = { .version = 0, };
 358         krb5_error_code code;
 359         const char *krb5err;
 360         enum ndr_err_code ndr_err;
 361         NTSTATUS nt_status;
 362         krb5_data cred_ndr_data;
 363         krb5_enc_data cred_ndr_crypt;
 364         size_t enc_len = 0;
 365
 366         *cred_info_blob = data_blob_null;
 367
 368         code = krb5_k_create_key(context,
 369                                  pkreplykey,
 370                                  &cred_key);
 371         if (code != 0) {
 372                 krb5err = krb5_get_error_message(context, code);
 373                 DEBUG(1, ("Failed initializing cred data crypto: %s\n", krb5err));
 374                 krb5_free_error_message(context, krb5err);
 375                 return code;
 376         }
 377
 378         cred_enctype = krb5_k_key_enctype(context, cred_key);
 379
 380         DEBUG(10, ("Plain cred_ndr_blob (len %zu)\n",
 381                   cred_ndr_blob->length));
 382         dump_data_pw("PAC_CREDENTIAL_DATA_NDR",
 383                      cred_ndr_blob->data, cred_ndr_blob->length);
 384
 385         pac_cred_info.encryption_type = cred_enctype;
 386
 387         cred_ndr_data.magic = 0;
 388         cred_ndr_data.data = (char *)cred_ndr_blob->data;
 389         cred_ndr_data.length = cred_ndr_blob->length;
 390
 391         code = krb5_c_encrypt_length(context,
 392                                      cred_enctype,
 393                                      cred_ndr_data.length,
 394                                      &enc_len);
 395         if (code != 0) {
 396                 krb5err = krb5_get_error_message(context, code);
 397                 DEBUG(1, ("Failed initializing cred data crypto: %s\n", krb5err));
 398                 krb5_free_error_message(context, krb5err);
 399                 return code;
 400         }
 401
 402         pac_cred_info.encrypted_data = data_blob_talloc_zero(mem_ctx, enc_len);
 403         if (pac_cred_info.encrypted_data.data == NULL) {
 404                 DBG_ERR("Out of memory\n");
 405                 return ENOMEM;
 406         }
 407
 408         cred_ndr_crypt.ciphertext.length = enc_len;
 409         cred_ndr_crypt.ciphertext.data = (char *)pac_cred_info.encrypted_data.data;
 410
 411         code = krb5_k_encrypt(context,
 412                               cred_key,
 413                               KRB5_KU_OTHER_ENCRYPTED,
 414                               NULL,
 415                               &cred_ndr_data,
 416                               &cred_ndr_crypt);
 417         krb5_k_free_key(context, cred_key);
 418         if (code != 0) {
 419                 krb5err = krb5_get_error_message(context, code);
 420                 DEBUG(1, ("Failed crypt of cred data: %s\n", krb5err));
 421                 krb5_free_error_message(context, krb5err);
 422                 return code;
 423         }
 424
 425         if (DEBUGLVL(10)) {
 426                 NDR_PRINT_DEBUG(PAC_CREDENTIAL_INFO, &pac_cred_info);
 427         }
 428
 429         ndr_err = ndr_push_struct_blob(cred_info_blob, mem_ctx, &pac_cred_info,
 430                         (ndr_push_flags_fn_t)ndr_push_PAC_CREDENTIAL_INFO);
 431         TALLOC_FREE(pac_cred_info.encrypted_data.data);
 432         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 433                 nt_status = ndr_map_error2ntstatus(ndr_err);
 434                 DEBUG(1, ("PAC_CREDENTIAL_INFO (presig) push failed: %s\n",
 435                           nt_errstr(nt_status)));
 436                 return KRB5KDC_ERR_SVC_UNAVAILABLE;
 437         }
 438
 439         DEBUG(10, ("Encrypted credential BLOB (len %zu) with alg %d\n",
 440                   cred_info_blob->length, (int)pac_cred_info.encryption_type));
 441         dump_data_pw("PAC_CREDENTIAL_INFO",
 442                       cred_info_blob->data, cred_info_blob->length);
 443
 444         return 0;
 445 }
 446 #endif /* SAMBA4_USES_HEIMDAL */
 447
 448
 449 krb5_error_code samba_make_krb5_pac(krb5_context context,
 450                                     const DATA_BLOB *logon_blob,
 451                                     const DATA_BLOB *cred_blob,
 452                                     const DATA_BLOB *upn_blob,
 453                                     const DATA_BLOB *pac_attrs_blob,
 454                                     const DATA_BLOB *deleg_blob,
 455                                     krb5_pac *pac)
 456 {
 457         krb5_data logon_data;
 458         krb5_data cred_data;
 459         krb5_data upn_data;
 460         krb5_data pac_attrs_data;
 461         krb5_data deleg_data;
 462         krb5_error_code ret;
 463 #ifdef SAMBA4_USES_HEIMDAL
 464         krb5_data null_data = {
 465                 .length = 0,
 466                 .data = NULL,
 467         };
 468 #endif
 469
 470         /* The user account may be set not to want the PAC */
 471         if (logon_blob == NULL) {
 472                 return 0;
 473         }
 474
 475         ret = smb_krb5_copy_data_contents(&logon_data,
 476                                           logon_blob->data,
 477                                           logon_blob->length);
 478         if (ret != 0) {
 479                 return ret;
 480         }
 481
 482         ZERO_STRUCT(cred_data);
 483         if (cred_blob != NULL) {
 484                 ret = smb_krb5_copy_data_contents(&cred_data,
 485                                                   cred_blob->data,
 486                                                   cred_blob->length);
 487                 if (ret != 0) {
 488                         smb_krb5_free_data_contents(context, &logon_data);
 489                         return ret;
 490                 }
 491         }
 492
 493         ZERO_STRUCT(upn_data);
 494         if (upn_blob != NULL) {
 495                 ret = smb_krb5_copy_data_contents(&upn_data,
 496                                                   upn_blob->data,
 497                                                   upn_blob->length);
 498                 if (ret != 0) {
 499                         smb_krb5_free_data_contents(context, &logon_data);
 500                         smb_krb5_free_data_contents(context, &cred_data);
 501                         return ret;
 502                 }
 503         }
 504
 505         ZERO_STRUCT(pac_attrs_data);
 506         if (pac_attrs_blob != NULL) {
 507                 ret = smb_krb5_copy_data_contents(&pac_attrs_data,
 508                                                   pac_attrs_blob->data,
 509                                                   pac_attrs_blob->length);
 510                 if (ret != 0) {
 511                         smb_krb5_free_data_contents(context, &logon_data);
 512                         smb_krb5_free_data_contents(context, &cred_data);
 513                         smb_krb5_free_data_contents(context, &upn_data);
 514                         return ret;
 515                 }
 516         }
 517
 518         ZERO_STRUCT(deleg_data);
 519         if (deleg_blob != NULL) {
 520                 ret = smb_krb5_copy_data_contents(&deleg_data,
 521                                                   deleg_blob->data,
 522                                                   deleg_blob->length);
 523                 if (ret != 0) {
 524                         smb_krb5_free_data_contents(context, &logon_data);
 525                         smb_krb5_free_data_contents(context, &cred_data);
 526                         smb_krb5_free_data_contents(context, &upn_data);
 527                         smb_krb5_free_data_contents(context, &pac_attrs_data);
 528                         return ret;
 529                 }
 530         }
 531
 532         ret = krb5_pac_init(context, pac);
 533         if (ret != 0) {
 534                 smb_krb5_free_data_contents(context, &logon_data);
 535                 smb_krb5_free_data_contents(context, &cred_data);
 536                 smb_krb5_free_data_contents(context, &upn_data);
 537                 smb_krb5_free_data_contents(context, &pac_attrs_data);
 538                 smb_krb5_free_data_contents(context, &deleg_data);
 539                 return ret;
 540         }
 541
 542         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &logon_data);
 543         smb_krb5_free_data_contents(context, &logon_data);
 544         if (ret != 0) {
 545                 smb_krb5_free_data_contents(context, &cred_data);
 546                 smb_krb5_free_data_contents(context, &upn_data);
 547                 smb_krb5_free_data_contents(context, &pac_attrs_data);
 548                 smb_krb5_free_data_contents(context, &deleg_data);
 549                 return ret;
 550         }
 551
 552         if (cred_blob != NULL) {
 553                 ret = krb5_pac_add_buffer(context, *pac,
 554                                           PAC_TYPE_CREDENTIAL_INFO,
 555                                           &cred_data);
 556                 smb_krb5_free_data_contents(context, &cred_data);
 557                 if (ret != 0) {
 558                         smb_krb5_free_data_contents(context, &upn_data);
 559                         smb_krb5_free_data_contents(context, &pac_attrs_data);
 560                         smb_krb5_free_data_contents(context, &deleg_data);
 561                         return ret;
 562                 }
 563         }
 564
 565 #ifdef SAMBA4_USES_HEIMDAL
 566         /*
 567          * null_data will be filled by the generic KDC code in the caller
 568          * here we just add it in order to have it before
 569          * PAC_TYPE_UPN_DNS_INFO
 570          *
 571          * Not needed with MIT Kerberos - asn
 572          */
 573         ret = krb5_pac_add_buffer(context, *pac,
 574                                   PAC_TYPE_LOGON_NAME,
 575                                   &null_data);
 576         if (ret != 0) {
 577                 smb_krb5_free_data_contents(context, &upn_data);
 578                 smb_krb5_free_data_contents(context, &pac_attrs_data);
 579                 smb_krb5_free_data_contents(context, &deleg_data);
 580                 return ret;
 581         }
 582 #endif
 583
 584         if (upn_blob != NULL) {
 585                 ret = krb5_pac_add_buffer(context, *pac,
 586                                           PAC_TYPE_UPN_DNS_INFO,
 587                                           &upn_data);
 588                 smb_krb5_free_data_contents(context, &upn_data);
 589                 if (ret != 0) {
 590                         smb_krb5_free_data_contents(context, &pac_attrs_data);
 591                         smb_krb5_free_data_contents(context, &deleg_data);
 592                         return ret;
 593                 }
 594         }
 595
 596         if (pac_attrs_blob != NULL) {
 597                 ret = krb5_pac_add_buffer(context, *pac,
 598                                           PAC_TYPE_ATTRIBUTES_INFO,
 599                                           &pac_attrs_data);
 600                 smb_krb5_free_data_contents(context, &pac_attrs_data);
 601                 if (ret != 0) {
 602                         smb_krb5_free_data_contents(context, &deleg_data);
 603                         return ret;
 604                 }
 605         }
 606
 607         if (deleg_blob != NULL) {
 608                 ret = krb5_pac_add_buffer(context, *pac,
 609                                           PAC_TYPE_CONSTRAINED_DELEGATION,
 610                                           &deleg_data);
 611                 smb_krb5_free_data_contents(context, &deleg_data);
 612                 if (ret != 0) {
 613                         return ret;
 614                 }
 615         }
 616
 617         return ret;
 618 }
 619
 620 bool samba_princ_needs_pac(struct samba_kdc_entry *skdc_entry)
 621 {
 622
 623         uint32_t userAccountControl;
 624
 625         /* The service account may be set not to want the PAC */
 626         userAccountControl = ldb_msg_find_attr_as_uint(skdc_entry->msg, "userAccountControl", 0);
 627         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 628                 return false;
 629         }
 630
 631         return true;
 632 }
 633
 634 int samba_client_requested_pac(krb5_context context,
 635                                krb5_pac *pac,
 636                                TALLOC_CTX *mem_ctx,
 637                                bool *requested_pac)
 638 {
 639         enum ndr_err_code ndr_err;
 640         krb5_data k5pac_attrs_in;
 641         DATA_BLOB pac_attrs_in;
 642         union PAC_INFO pac_attrs;
 643         int ret;
 644
 645         *requested_pac = true;
 646
 647         ret = krb5_pac_get_buffer(context, *pac, PAC_TYPE_ATTRIBUTES_INFO,
 648                                   &k5pac_attrs_in);
 649         if (ret != 0) {
 650                 return ret == ENOENT ? 0 : ret;
 651         }
 652
 653         pac_attrs_in = data_blob_const(k5pac_attrs_in.data,
 654                                        k5pac_attrs_in.length);
 655
 656         ndr_err = ndr_pull_union_blob(&pac_attrs_in, mem_ctx, &pac_attrs,
 657                                       PAC_TYPE_ATTRIBUTES_INFO,
 658                                       (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
 659         smb_krb5_free_data_contents(context, &k5pac_attrs_in);
 660         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 661                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
 662                 DEBUG(0,("can't parse the PAC ATTRIBUTES_INFO: %s\n", nt_errstr(nt_status)));
 663                 return EINVAL;
 664         }
 665
 666         if (pac_attrs.attributes_info.flags & (PAC_ATTRIBUTE_FLAG_PAC_WAS_GIVEN_IMPLICITLY
 667                                                | PAC_ATTRIBUTE_FLAG_PAC_WAS_REQUESTED)) {
 668                 *requested_pac = true;
 669         } else {
 670                 *requested_pac = false;
 671         }
 672
 673         return 0;
 674 }
 675
 676 /* Was the krbtgt in this DB (ie, should we check the incoming signature) and was it an RODC */
 677 int samba_krbtgt_is_in_db(struct samba_kdc_entry *p,
 678                           bool *is_in_db,
 679                           bool *is_untrusted)
 680 {
 681         NTSTATUS status;
 682         int rodc_krbtgt_number, trust_direction;
 683         uint32_t rid;
 684
 685         TALLOC_CTX *mem_ctx = talloc_new(NULL);
 686         if (!mem_ctx) {
 687                 return ENOMEM;
 688         }
 689
 690         trust_direction = ldb_msg_find_attr_as_int(p->msg, "trustDirection", 0);
 691
 692         if (trust_direction != 0) {
 693                 /* Domain trust - we cannot check the sig, but we trust it for a correct PAC
 694
 695                    This is exactly where we should flag for SID
 696                    validation when we do inter-foreest trusts
 697                  */
 698                 talloc_free(mem_ctx);
 699                 *is_untrusted = false;
 700                 *is_in_db = false;
 701                 return 0;
 702         }
 703
 704         /* The lack of password controls etc applies to krbtgt by
 705          * virtue of being that particular RID */
 706         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, p->msg, "objectSid"), NULL, &rid);
 707
 708         if (!NT_STATUS_IS_OK(status)) {
 709                 talloc_free(mem_ctx);
 710                 return EINVAL;
 711         }
 712
 713         rodc_krbtgt_number = ldb_msg_find_attr_as_int(p->msg, "msDS-SecondaryKrbTgtNumber", -1);
 714
 715         if (p->kdc_db_ctx->my_krbtgt_number == 0) {
 716                 if (rid == DOMAIN_RID_KRBTGT) {
 717                         *is_untrusted = false;
 718                         *is_in_db = true;
 719                         talloc_free(mem_ctx);
 720                         return 0;
 721                 } else if (rodc_krbtgt_number != -1) {
 722                         *is_in_db = true;
 723                         *is_untrusted = true;
 724                         talloc_free(mem_ctx);
 725                         return 0;
 726                 }
 727         } else if ((rid != DOMAIN_RID_KRBTGT) && (rodc_krbtgt_number == p->kdc_db_ctx->my_krbtgt_number)) {
 728                 talloc_free(mem_ctx);
 729                 *is_untrusted = false;
 730                 *is_in_db = true;
 731                 return 0;
 732         } else if (rid == DOMAIN_RID_KRBTGT) {
 733                 /* krbtgt viewed from an RODC */
 734                 talloc_free(mem_ctx);
 735                 *is_untrusted = false;
 736                 *is_in_db = false;
 737                 return 0;
 738         }
 739
 740         /* Another RODC */
 741         talloc_free(mem_ctx);
 742         *is_untrusted = true;
 743         *is_in_db = false;
 744         return 0;
 745 }
 746
 747 NTSTATUS samba_kdc_get_pac_blobs(TALLOC_CTX *mem_ctx,
 748                                  struct samba_kdc_entry *p,
 749                                  DATA_BLOB **_logon_info_blob,
 750                                  DATA_BLOB **_cred_ndr_blob,
 751                                  DATA_BLOB **_upn_info_blob,
 752                                  DATA_BLOB **_pac_attrs_blob,
 753                                  const krb5_boolean *pac_request)
 754 {
 755         struct auth_user_info_dc *user_info_dc;
 756         DATA_BLOB *logon_blob = NULL;
 757         DATA_BLOB *cred_blob = NULL;
 758         DATA_BLOB *upn_blob = NULL;
 759         DATA_BLOB *pac_attrs_blob = NULL;
 760         NTSTATUS nt_status;
 761
 762         *_logon_info_blob = NULL;
 763         if (_cred_ndr_blob != NULL) {
 764                 *_cred_ndr_blob = NULL;
 765         }
 766         *_upn_info_blob = NULL;
 767         if (_pac_attrs_blob != NULL) {
 768                 *_pac_attrs_blob = NULL;
 769         }
 770
 771         logon_blob = talloc_zero(mem_ctx, DATA_BLOB);
 772         if (logon_blob == NULL) {
 773                 return NT_STATUS_NO_MEMORY;
 774         }
 775
 776         if (_cred_ndr_blob != NULL) {
 777                 cred_blob = talloc_zero(mem_ctx, DATA_BLOB);
 778                 if (cred_blob == NULL) {
 779                         return NT_STATUS_NO_MEMORY;
 780                 }
 781         }
 782
 783         upn_blob = talloc_zero(mem_ctx, DATA_BLOB);
 784         if (upn_blob == NULL) {
 785                 return NT_STATUS_NO_MEMORY;
 786         }
 787
 788         if (_pac_attrs_blob != NULL) {
 789                 pac_attrs_blob = talloc_zero(mem_ctx, DATA_BLOB);
 790                 if (pac_attrs_blob == NULL) {
 791                         return NT_STATUS_NO_MEMORY;
 792                 }
 793         }
 794
 795         nt_status = authsam_make_user_info_dc(mem_ctx, p->kdc_db_ctx->samdb,
 796                                              lpcfg_netbios_name(p->kdc_db_ctx->lp_ctx),
 797                                              lpcfg_sam_name(p->kdc_db_ctx->lp_ctx),
 798                                              lpcfg_sam_dnsname(p->kdc_db_ctx->lp_ctx),
 799                                              p->realm_dn,
 800                                              p->msg,
 801                                              data_blob(NULL, 0),
 802                                              data_blob(NULL, 0),
 803                                              &user_info_dc);
 804         if (!NT_STATUS_IS_OK(nt_status)) {
 805                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 806                           nt_errstr(nt_status)));
 807                 return nt_status;
 808         }
 809
 810         nt_status = samba_get_logon_info_pac_blob(logon_blob,
 811                                                   user_info_dc,
 812                                                   logon_blob);
 813         if (!NT_STATUS_IS_OK(nt_status)) {
 814                 DEBUG(0, ("Building PAC LOGON INFO failed: %s\n",
 815                           nt_errstr(nt_status)));
 816                 return nt_status;
 817         }
 818
 819         if (cred_blob != NULL) {
 820                 nt_status = samba_get_cred_info_ndr_blob(cred_blob,
 821                                                          p->msg,
 822                                                          cred_blob);
 823                 if (!NT_STATUS_IS_OK(nt_status)) {
 824                         DEBUG(0, ("Building PAC CRED INFO failed: %s\n",
 825                                   nt_errstr(nt_status)));
 826                         return nt_status;
 827                 }
 828         }
 829
 830         nt_status = samba_get_upn_info_pac_blob(upn_blob,
 831                                                 user_info_dc,
 832                                                 upn_blob);
 833         if (!NT_STATUS_IS_OK(nt_status)) {
 834                 DEBUG(0, ("Building PAC UPN INFO failed: %s\n",
 835                           nt_errstr(nt_status)));
 836                 return nt_status;
 837         }
 838
 839         if (pac_attrs_blob != NULL) {
 840                 nt_status = samba_get_pac_attrs_blob(pac_attrs_blob,
 841                                                      pac_request,
 842                                                      pac_attrs_blob);
 843
 844                 if (!NT_STATUS_IS_OK(nt_status)) {
 845                         DEBUG(0, ("Building PAC ATTRIBUTES failed: %s\n",
 846                                   nt_errstr(nt_status)));
 847                         return nt_status;
 848                 }
 849         }
 850
 851         TALLOC_FREE(user_info_dc);
 852         *_logon_info_blob = logon_blob;
 853         if (_cred_ndr_blob != NULL) {
 854                 *_cred_ndr_blob = cred_blob;
 855         }
 856         *_upn_info_blob = upn_blob;
 857         if (_pac_attrs_blob != NULL) {
 858                 *_pac_attrs_blob = pac_attrs_blob;
 859         }
 860         return NT_STATUS_OK;
 861 }
 862
 863 NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
 864                                 struct samba_kdc_entry *p,
 865                                 DATA_BLOB **_logon_info_blob)
 866 {
 867         NTSTATUS nt_status;
 868         DATA_BLOB *upn_blob = NULL;
 869
 870         nt_status = samba_kdc_get_pac_blobs(mem_ctx, p,
 871                                             _logon_info_blob,
 872                                             NULL, /* cred_blob */
 873                                             &upn_blob,
 874                                             NULL,
 875                                             NULL);
 876         if (!NT_STATUS_IS_OK(nt_status)) {
 877                 return nt_status;
 878         }
 879
 880         TALLOC_FREE(upn_blob);
 881         return NT_STATUS_OK;
 882 }
 883
 884 NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
 885                                    krb5_context context,
 886                                    struct ldb_context *samdb,
 887                                    const krb5_pac pac, DATA_BLOB *pac_blob,
 888                                    struct PAC_SIGNATURE_DATA *pac_srv_sig,
 889                                    struct PAC_SIGNATURE_DATA *pac_kdc_sig)
 890 {
 891         struct auth_user_info_dc *user_info_dc;
 892         krb5_error_code ret;
 893         NTSTATUS nt_status;
 894
 895         ret = kerberos_pac_to_user_info_dc(mem_ctx, pac,
 896                                            context, &user_info_dc, pac_srv_sig, pac_kdc_sig);
 897         if (ret) {
 898                 return NT_STATUS_UNSUCCESSFUL;
 899         }
 900
 901         /*
 902          * We need to expand group memberships within our local domain,
 903          * as the token might be generated by a trusted domain.
 904          */
 905         nt_status = authsam_update_user_info_dc(mem_ctx,
 906                                                 samdb,
 907                                                 user_info_dc);
 908         if (!NT_STATUS_IS_OK(nt_status)) {
 909                 return nt_status;
 910         }
 911
 912         nt_status = samba_get_logon_info_pac_blob(mem_ctx,
 913                                                   user_info_dc, pac_blob);
 914
 915         return nt_status;
 916 }
 917
 918 NTSTATUS samba_kdc_update_delegation_info_blob(TALLOC_CTX *mem_ctx,
 919                                 krb5_context context,
 920                                 const krb5_pac pac,
 921                                 const krb5_principal server_principal,
 922                                 const krb5_principal proxy_principal,
 923                                 DATA_BLOB *new_blob)
 924 {
 925         krb5_data old_data;
 926         DATA_BLOB old_blob;
 927         krb5_error_code ret;
 928         NTSTATUS nt_status;
 929         enum ndr_err_code ndr_err;
 930         union PAC_INFO info;
 931         struct PAC_CONSTRAINED_DELEGATION _d;
 932         struct PAC_CONSTRAINED_DELEGATION *d = NULL;
 933         char *server = NULL;
 934         char *proxy = NULL;
 935         uint32_t i;
 936         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 937
 938         if (tmp_ctx == NULL) {
 939                 return NT_STATUS_NO_MEMORY;
 940         }
 941
 942         ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_CONSTRAINED_DELEGATION, &old_data);
 943         if (ret == ENOENT) {
 944                 ZERO_STRUCT(old_data);
 945         } else if (ret) {
 946                 talloc_free(tmp_ctx);
 947                 return NT_STATUS_UNSUCCESSFUL;
 948         }
 949
 950         old_blob.length = old_data.length;
 951         old_blob.data = (uint8_t *)old_data.data;
 952
 953         ZERO_STRUCT(info);
 954         if (old_blob.length > 0) {
 955                 ndr_err = ndr_pull_union_blob(&old_blob, mem_ctx,
 956                                 &info, PAC_TYPE_CONSTRAINED_DELEGATION,
 957                                 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
 958                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 959                         smb_krb5_free_data_contents(context, &old_data);
 960                         nt_status = ndr_map_error2ntstatus(ndr_err);
 961                         DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 962                         talloc_free(tmp_ctx);
 963                         return nt_status;
 964                 }
 965         } else {
 966                 ZERO_STRUCT(_d);
 967                 info.constrained_delegation.info = &_d;
 968         }
 969         smb_krb5_free_data_contents(context, &old_data);
 970
 971         ret = krb5_unparse_name_flags(context, server_principal,
 972                                       KRB5_PRINCIPAL_UNPARSE_NO_REALM, &server);
 973         if (ret) {
 974                 talloc_free(tmp_ctx);
 975                 return NT_STATUS_INTERNAL_ERROR;
 976         }
 977
 978         ret = krb5_unparse_name(context, proxy_principal, &proxy);
 979         if (ret) {
 980                 SAFE_FREE(server);
 981                 talloc_free(tmp_ctx);
 982                 return NT_STATUS_INTERNAL_ERROR;
 983         }
 984
 985         d = info.constrained_delegation.info;
 986         i = d->num_transited_services;
 987         d->proxy_target.string = server;
 988         d->transited_services = talloc_realloc(mem_ctx, d->transited_services,
 989                                                struct lsa_String, i + 1);
 990         d->transited_services[i].string = proxy;
 991         d->num_transited_services = i + 1;
 992
 993         ndr_err = ndr_push_union_blob(new_blob, mem_ctx,
 994                                 &info, PAC_TYPE_CONSTRAINED_DELEGATION,
 995                                 (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
 996         SAFE_FREE(server);
 997         SAFE_FREE(proxy);
 998         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 999                 smb_krb5_free_data_contents(context, &old_data);
1000                 nt_status = ndr_map_error2ntstatus(ndr_err);
1001                 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
1002                 talloc_free(tmp_ctx);
1003                 return nt_status;
1004         }
1005
1006         talloc_free(tmp_ctx);
1007         return NT_STATUS_OK;
1008 }
1009
1010 /* function to map policy errors */
1011 krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
1012 {
1013         krb5_error_code ret;
1014
1015         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
1016                 ret = KRB5KDC_ERR_KEY_EXP;
1017         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
1018                 ret = KRB5KDC_ERR_KEY_EXP;
1019         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
1020                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
1021         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
1022                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
1023         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
1024                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
1025         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
1026                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
1027         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
1028                 ret = KRB5KDC_ERR_POLICY;
1029         else
1030                 ret = KRB5KDC_ERR_POLICY;
1031
1032         return ret;
1033 }
1034
1035 /* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
1036  * for consistency */
1037 NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
1038                                        const char *client_name,
1039                                        const char *workstation,
1040                                        bool password_change)
1041 {
1042         TALLOC_CTX *tmp_ctx;
1043         NTSTATUS nt_status;
1044
1045         tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
1046         if (!tmp_ctx) {
1047                 return NT_STATUS_NO_MEMORY;
1048         }
1049
1050         /* we allow all kinds of trusts here */
1051         nt_status = authsam_account_ok(tmp_ctx,
1052                                        kdc_entry->kdc_db_ctx->samdb,
1053                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
1054                                        MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
1055                                        kdc_entry->realm_dn, kdc_entry->msg,
1056                                        workstation, client_name,
1057                                        true, password_change);
1058
1059         talloc_free(tmp_ctx);
1060         return nt_status;
1061 }
1062
1063 /* Does a parse and SID check, but no crypto. */
1064 krb5_error_code samba_kdc_validate_pac_blob(
1065                 krb5_context context,
1066                 struct samba_kdc_entry *client_skdc_entry,
1067                 const krb5_pac pac)
1068 {
1069         TALLOC_CTX *frame = talloc_stackframe();
1070         struct auth_user_info_dc *pac_user_info = NULL;
1071         struct dom_sid *client_sid = NULL;
1072         struct dom_sid pac_sid;
1073         krb5_error_code code;
1074         bool ok;
1075
1076         code = kerberos_pac_to_user_info_dc(frame,
1077                                             pac,
1078                                             context,
1079                                             &pac_user_info,
1080                                             NULL,
1081                                             NULL);
1082         if (code != 0) {
1083                 goto out;
1084         }
1085
1086         if (pac_user_info->num_sids == 0) {
1087                 code = EINVAL;
1088                 goto out;
1089         }
1090
1091         pac_sid = pac_user_info->sids[0];
1092         client_sid = samdb_result_dom_sid(frame,
1093                                           client_skdc_entry->msg,
1094                                           "objectSid");
1095
1096         ok = dom_sid_equal(&pac_sid, client_sid);
1097         if (!ok) {
1098                 struct dom_sid_buf buf1;
1099                 struct dom_sid_buf buf2;
1100
1101                 DBG_ERR("SID mismatch between PAC and looked up client: "
1102                         "PAC[%s] != CLI[%s]\n",
1103                         dom_sid_str_buf(&pac_sid, &buf1),
1104                         dom_sid_str_buf(client_sid, &buf2));
1105 #if defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
1106                         code = KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
1107 #else /* Heimdal (where this is an enum) */
1108                         code = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1109 #endif
1110                 goto out;
1111         }
1112
1113         code = 0;
1114 out:
1115         TALLOC_FREE(frame);
1116         return code;
1117 }