source4/auth/kerberos/kerberos_pac.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Create and parse the krb5 PAC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005,2008
   7    Copyright (C) Andrew Tridgell 2001
   8    Copyright (C) Luke Howard 2002-2003
   9    Copyright (C) Stefan Metzmacher 2004-2005
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "system/kerberos.h"
  28 #include "auth/auth.h"
  29 #include "auth/kerberos/kerberos.h"
  30 #include "librpc/gen_ndr/ndr_krb5pac.h"
  31 #include "lib/ldb/include/ldb.h"
  32 #include "auth/auth_sam_reply.h"
  33 #include "param/param.h"
  34
  35 static krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
  36                                           DATA_BLOB pac_data,
  37                                           struct PAC_SIGNATURE_DATA *sig,
  38                                           krb5_context context,
  39                                           const krb5_keyblock *keyblock)
  40 {
  41         krb5_error_code ret;
  42         krb5_crypto crypto;
  43         Checksum cksum;
  44
  45         cksum.cksumtype         = (CKSUMTYPE)sig->type;
  46         cksum.checksum.length   = sig->signature.length;
  47         cksum.checksum.data     = sig->signature.data;
  48
  49         ret = krb5_crypto_init(context,
  50                                keyblock,
  51                                0,
  52                                &crypto);
  53         if (ret) {
  54                 DEBUG(0,("krb5_crypto_init() failed: %s\n",
  55                           smb_get_krb5_error_message(context, ret, mem_ctx)));
  56                 return ret;
  57         }
  58         ret = krb5_verify_checksum(context,
  59                                    crypto,
  60                                    KRB5_KU_OTHER_CKSUM,
  61                                    pac_data.data,
  62                                    pac_data.length,
  63                                    &cksum);
  64         krb5_crypto_destroy(context, crypto);
  65
  66         return ret;
  67 }
  68
  69  NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx,
  70                               struct smb_iconv_convenience *iconv_convenience,
  71                               struct PAC_DATA **pac_data_out,
  72                               DATA_BLOB blob,
  73                               krb5_context context,
  74                               const krb5_keyblock *krbtgt_keyblock,
  75                               const krb5_keyblock *service_keyblock,
  76                               krb5_const_principal client_principal,
  77                               time_t tgs_authtime,
  78                               krb5_error_code *k5ret)
  79 {
  80         krb5_error_code ret;
  81         NTSTATUS status;
  82         enum ndr_err_code ndr_err;
  83         struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL;
  84         struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL;
  85         struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL;
  86         struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL;
  87         struct PAC_LOGON_INFO *logon_info = NULL;
  88         struct PAC_LOGON_NAME *logon_name = NULL;
  89         struct PAC_DATA *pac_data;
  90         struct PAC_DATA_RAW *pac_data_raw;
  91
  92         DATA_BLOB *srv_sig_blob = NULL;
  93         DATA_BLOB *kdc_sig_blob = NULL;
  94
  95         DATA_BLOB modified_pac_blob;
  96         NTTIME tgs_authtime_nttime;
  97         krb5_principal client_principal_pac;
  98         int i;
  99
 100         krb5_clear_error_string(context);
 101
 102         if (k5ret) {
 103                 *k5ret = KRB5_PARSE_MALFORMED;
 104         }
 105
 106         pac_data = talloc(mem_ctx, struct PAC_DATA);
 107         pac_data_raw = talloc(mem_ctx, struct PAC_DATA_RAW);
 108         kdc_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
 109         srv_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
 110         if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
 111                 if (k5ret) {
 112                         *k5ret = ENOMEM;
 113                 }
 114                 return NT_STATUS_NO_MEMORY;
 115         }
 116
 117         ndr_err = ndr_pull_struct_blob(&blob, pac_data,
 118                         iconv_convenience, pac_data,
 119                        (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
 120         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 121                 status = ndr_map_error2ntstatus(ndr_err);
 122                 DEBUG(0,("can't parse the PAC: %s\n",
 123                         nt_errstr(status)));
 124                 return status;
 125         }
 126
 127         if (pac_data->num_buffers < 4) {
 128                 /* we need logon_ingo, service_key and kdc_key */
 129                 DEBUG(0,("less than 4 PAC buffers\n"));
 130                 return NT_STATUS_INVALID_PARAMETER;
 131         }
 132
 133         ndr_err = ndr_pull_struct_blob(&blob, pac_data_raw,
 134                                        iconv_convenience, pac_data_raw,
 135                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW);
 136         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 137                 status = ndr_map_error2ntstatus(ndr_err);
 138                 DEBUG(0,("can't parse the PAC: %s\n",
 139                         nt_errstr(status)));
 140                 return status;
 141         }
 142
 143         if (pac_data_raw->num_buffers < 4) {
 144                 /* we need logon_ingo, service_key and kdc_key */
 145                 DEBUG(0,("less than 4 PAC buffers\n"));
 146                 return NT_STATUS_INVALID_PARAMETER;
 147         }
 148
 149         if (pac_data->num_buffers != pac_data_raw->num_buffers) {
 150                 /* we need logon_ingo, service_key and kdc_key */
 151                 DEBUG(0,("misparse!  PAC_DATA has %d buffers while PAC_DATA_RAW has %d\n",
 152                          pac_data->num_buffers, pac_data_raw->num_buffers));
 153                 return NT_STATUS_INVALID_PARAMETER;
 154         }
 155
 156         for (i=0; i < pac_data->num_buffers; i++) {
 157                 if (pac_data->buffers[i].type != pac_data_raw->buffers[i].type) {
 158                         DEBUG(0,("misparse!  PAC_DATA buffer %d has type %d while PAC_DATA_RAW has %d\n",
 159                                  i, pac_data->buffers[i].type, pac_data->buffers[i].type));
 160                         return NT_STATUS_INVALID_PARAMETER;
 161                 }
 162                 switch (pac_data->buffers[i].type) {
 163                         case PAC_TYPE_LOGON_INFO:
 164                                 if (!pac_data->buffers[i].info) {
 165                                         break;
 166                                 }
 167                                 logon_info = pac_data->buffers[i].info->logon_info.info;
 168                                 break;
 169                         case PAC_TYPE_SRV_CHECKSUM:
 170                                 if (!pac_data->buffers[i].info) {
 171                                         break;
 172                                 }
 173                                 srv_sig_ptr = &pac_data->buffers[i].info->srv_cksum;
 174                                 srv_sig_blob = &pac_data_raw->buffers[i].info->remaining;
 175                                 break;
 176                         case PAC_TYPE_KDC_CHECKSUM:
 177                                 if (!pac_data->buffers[i].info) {
 178                                         break;
 179                                 }
 180                                 kdc_sig_ptr = &pac_data->buffers[i].info->kdc_cksum;
 181                                 kdc_sig_blob = &pac_data_raw->buffers[i].info->remaining;
 182                                 break;
 183                         case PAC_TYPE_LOGON_NAME:
 184                                 logon_name = &pac_data->buffers[i].info->logon_name;
 185                                 break;
 186                         default:
 187                                 break;
 188                 }
 189         }
 190
 191         if (!logon_info) {
 192                 DEBUG(0,("PAC no logon_info\n"));
 193                 return NT_STATUS_INVALID_PARAMETER;
 194         }
 195
 196         if (!logon_name) {
 197                 DEBUG(0,("PAC no logon_name\n"));
 198                 return NT_STATUS_INVALID_PARAMETER;
 199         }
 200
 201         if (!srv_sig_ptr || !srv_sig_blob) {
 202                 DEBUG(0,("PAC no srv_key\n"));
 203                 return NT_STATUS_INVALID_PARAMETER;
 204         }
 205
 206         if (!kdc_sig_ptr || !kdc_sig_blob) {
 207                 DEBUG(0,("PAC no kdc_key\n"));
 208                 return NT_STATUS_INVALID_PARAMETER;
 209         }
 210
 211         /* Find and zero out the signatures, as required by the signing algorithm */
 212
 213         /* We find the data blobs above, now we parse them to get at the exact portion we should zero */
 214         ndr_err = ndr_pull_struct_blob(kdc_sig_blob, kdc_sig_wipe,
 215                                        iconv_convenience, kdc_sig_wipe,
 216                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
 217         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 218                 status = ndr_map_error2ntstatus(ndr_err);
 219                 DEBUG(0,("can't parse the KDC signature: %s\n",
 220                         nt_errstr(status)));
 221                 return status;
 222         }
 223
 224         ndr_err = ndr_pull_struct_blob(srv_sig_blob, srv_sig_wipe,
 225                                        iconv_convenience, srv_sig_wipe,
 226                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
 227         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 228                 status = ndr_map_error2ntstatus(ndr_err);
 229                 DEBUG(0,("can't parse the SRV signature: %s\n",
 230                         nt_errstr(status)));
 231                 return status;
 232         }
 233
 234         /* Now zero the decoded structure */
 235         memset(kdc_sig_wipe->signature.data, '\0', kdc_sig_wipe->signature.length);
 236         memset(srv_sig_wipe->signature.data, '\0', srv_sig_wipe->signature.length);
 237
 238         /* and reencode, back into the same place it came from */
 239         ndr_err = ndr_push_struct_blob(kdc_sig_blob, pac_data_raw,
 240                                        iconv_convenience,
 241                                        kdc_sig_wipe,
 242                                        (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
 243         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 244                 status = ndr_map_error2ntstatus(ndr_err);
 245                 DEBUG(0,("can't repack the KDC signature: %s\n",
 246                         nt_errstr(status)));
 247                 return status;
 248         }
 249         ndr_err = ndr_push_struct_blob(srv_sig_blob, pac_data_raw,
 250                                        iconv_convenience,
 251                                        srv_sig_wipe,
 252                                        (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
 253         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 254                 status = ndr_map_error2ntstatus(ndr_err);
 255                 DEBUG(0,("can't repack the SRV signature: %s\n",
 256                         nt_errstr(status)));
 257                 return status;
 258         }
 259
 260         /* push out the whole structure, but now with zero'ed signatures */
 261         ndr_err = ndr_push_struct_blob(&modified_pac_blob, pac_data_raw,
 262                                        iconv_convenience,
 263                                        pac_data_raw,
 264                                        (ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW);
 265         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 266                 status = ndr_map_error2ntstatus(ndr_err);
 267                 DEBUG(0,("can't repack the RAW PAC: %s\n",
 268                         nt_errstr(status)));
 269                 return status;
 270         }
 271
 272         /* verify by service_key */
 273         ret = check_pac_checksum(mem_ctx,
 274                                  modified_pac_blob, srv_sig_ptr,
 275                                  context,
 276                                  service_keyblock);
 277         if (ret) {
 278                 DEBUG(1, ("PAC Decode: Failed to verify the service signature: %s\n",
 279                           smb_get_krb5_error_message(context, ret, mem_ctx)));
 280                 if (k5ret) {
 281                         *k5ret = ret;
 282                 }
 283                 return NT_STATUS_ACCESS_DENIED;
 284         }
 285
 286         if (krbtgt_keyblock) {
 287                 ret = check_pac_checksum(mem_ctx,
 288                                             srv_sig_ptr->signature, kdc_sig_ptr,
 289                                             context, krbtgt_keyblock);
 290                 if (ret) {
 291                         DEBUG(1, ("PAC Decode: Failed to verify the KDC signature: %s\n",
 292                                   smb_get_krb5_error_message(context, ret, mem_ctx)));
 293                         if (k5ret) {
 294                                 *k5ret = ret;
 295                         }
 296                         return NT_STATUS_ACCESS_DENIED;
 297                 }
 298         }
 299
 300         /* Convert to NT time, so as not to loose accuracy in comparison */
 301         unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
 302
 303         if (tgs_authtime_nttime != logon_name->logon_time) {
 304                 DEBUG(2, ("PAC Decode: Logon time mismatch between ticket and PAC!\n"));
 305                 DEBUG(2, ("PAC Decode: PAC: %s\n", nt_time_string(mem_ctx, logon_name->logon_time)));
 306                 DEBUG(2, ("PAC Decode: Ticket: %s\n", nt_time_string(mem_ctx, tgs_authtime_nttime)));
 307                 return NT_STATUS_ACCESS_DENIED;
 308         }
 309
 310         ret = krb5_parse_name_flags(context, logon_name->account_name, KRB5_PRINCIPAL_PARSE_NO_REALM,
 311                                     &client_principal_pac);
 312         if (ret) {
 313                 DEBUG(2, ("Could not parse name from incoming PAC: [%s]: %s\n",
 314                           logon_name->account_name,
 315                           smb_get_krb5_error_message(context, ret, mem_ctx)));
 316                 if (k5ret) {
 317                         *k5ret = ret;
 318                 }
 319                 return NT_STATUS_INVALID_PARAMETER;
 320         }
 321
 322         if (!krb5_principal_compare_any_realm(context, client_principal, client_principal_pac)) {
 323                 DEBUG(2, ("Name in PAC [%s] does not match principal name in ticket\n",
 324                           logon_name->account_name));
 325                 return NT_STATUS_ACCESS_DENIED;
 326         }
 327
 328 #if 0
 329         if (strcasecmp(logon_info->info3.base.account_name.string,
 330                        "Administrator")== 0) {
 331                 file_save("tmp_pac_data-admin.dat",blob.data,blob.length);
 332         }
 333 #endif
 334
 335         DEBUG(3,("Found account name from PAC: %s [%s]\n",
 336                  logon_info->info3.base.account_name.string,
 337                  logon_info->info3.base.full_name.string));
 338         *pac_data_out = pac_data;
 339
 340         return NT_STATUS_OK;
 341 }
 342
 343 _PUBLIC_  NTSTATUS kerberos_pac_logon_info(TALLOC_CTX *mem_ctx,
 344                                   struct smb_iconv_convenience *iconv_convenience,
 345                                   struct PAC_LOGON_INFO **logon_info,
 346                                   DATA_BLOB blob,
 347                                   krb5_context context,
 348                                   const krb5_keyblock *krbtgt_keyblock,
 349                                   const krb5_keyblock *service_keyblock,
 350                                   krb5_const_principal client_principal,
 351                                   time_t tgs_authtime,
 352                                   krb5_error_code *k5ret)
 353 {
 354         NTSTATUS nt_status;
 355         struct PAC_DATA *pac_data;
 356         int i;
 357         nt_status = kerberos_decode_pac(mem_ctx,
 358                                         iconv_convenience,
 359                                         &pac_data,
 360                                         blob,
 361                                         context,
 362                                         krbtgt_keyblock,
 363                                         service_keyblock,
 364                                         client_principal,
 365                                         tgs_authtime,
 366                                         k5ret);
 367         if (!NT_STATUS_IS_OK(nt_status)) {
 368                 return nt_status;
 369         }
 370
 371         *logon_info = NULL;
 372         for (i=0; i < pac_data->num_buffers; i++) {
 373                 if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
 374                         continue;
 375                 }
 376                 *logon_info = pac_data->buffers[i].info->logon_info.info;
 377         }
 378         if (!*logon_info) {
 379                 return NT_STATUS_INVALID_PARAMETER;
 380         }
 381         return NT_STATUS_OK;
 382 }
 383
 384 static krb5_error_code make_pac_checksum(TALLOC_CTX *mem_ctx,
 385                                          DATA_BLOB *pac_data,
 386                                          struct PAC_SIGNATURE_DATA *sig,
 387                                          krb5_context context,
 388                                          const krb5_keyblock *keyblock)
 389 {
 390         krb5_error_code ret;
 391         krb5_crypto crypto;
 392         Checksum cksum;
 393
 394
 395         ret = krb5_crypto_init(context,
 396                                keyblock,
 397                                0,
 398                                &crypto);
 399         if (ret) {
 400                 DEBUG(0,("krb5_crypto_init() failed: %s\n",
 401                           smb_get_krb5_error_message(context, ret, mem_ctx)));
 402                 return ret;
 403         }
 404         ret = krb5_create_checksum(context,
 405                                    crypto,
 406                                    KRB5_KU_OTHER_CKSUM,
 407                                    0,
 408                                    pac_data->data,
 409                                    pac_data->length,
 410                                    &cksum);
 411         if (ret) {
 412                 DEBUG(2, ("PAC Verification failed: %s\n",
 413                           smb_get_krb5_error_message(context, ret, mem_ctx)));
 414         }
 415
 416         krb5_crypto_destroy(context, crypto);
 417
 418         if (ret) {
 419                 return ret;
 420         }
 421
 422         sig->type = cksum.cksumtype;
 423         sig->signature = data_blob_talloc(mem_ctx, cksum.checksum.data, cksum.checksum.length);
 424         free_Checksum(&cksum);
 425
 426         return 0;
 427 }
 428
 429  krb5_error_code kerberos_encode_pac(TALLOC_CTX *mem_ctx,
 430                                      struct smb_iconv_convenience *iconv_convenience,
 431                                     struct PAC_DATA *pac_data,
 432                                     krb5_context context,
 433                                     const krb5_keyblock *krbtgt_keyblock,
 434                                     const krb5_keyblock *service_keyblock,
 435                                     DATA_BLOB *pac)
 436 {
 437         NTSTATUS nt_status;
 438         krb5_error_code ret;
 439         enum ndr_err_code ndr_err;
 440         DATA_BLOB zero_blob = data_blob(NULL, 0);
 441         DATA_BLOB tmp_blob = data_blob(NULL, 0);
 442         struct PAC_SIGNATURE_DATA *kdc_checksum = NULL;
 443         struct PAC_SIGNATURE_DATA *srv_checksum = NULL;
 444         int i;
 445
 446         /* First, just get the keytypes filled in (and lengths right, eventually) */
 447         for (i=0; i < pac_data->num_buffers; i++) {
 448                 if (pac_data->buffers[i].type != PAC_TYPE_KDC_CHECKSUM) {
 449                         continue;
 450                 }
 451                 kdc_checksum = &pac_data->buffers[i].info->kdc_cksum,
 452                 ret = make_pac_checksum(mem_ctx, &zero_blob,
 453                                         kdc_checksum,
 454                                         context, krbtgt_keyblock);
 455                 if (ret) {
 456                         DEBUG(2, ("making krbtgt PAC checksum failed: %s\n",
 457                                   smb_get_krb5_error_message(context, ret, mem_ctx)));
 458                         talloc_free(pac_data);
 459                         return ret;
 460                 }
 461         }
 462
 463         for (i=0; i < pac_data->num_buffers; i++) {
 464                 if (pac_data->buffers[i].type != PAC_TYPE_SRV_CHECKSUM) {
 465                         continue;
 466                 }
 467                 srv_checksum = &pac_data->buffers[i].info->srv_cksum;
 468                 ret = make_pac_checksum(mem_ctx, &zero_blob,
 469                                         srv_checksum,
 470                                         context, service_keyblock);
 471                 if (ret) {
 472                         DEBUG(2, ("making service PAC checksum failed: %s\n",
 473                                   smb_get_krb5_error_message(context, ret, mem_ctx)));
 474                         talloc_free(pac_data);
 475                         return ret;
 476                 }
 477         }
 478
 479         if (!kdc_checksum) {
 480                 DEBUG(2, ("Invalid PAC constructed for signing, no KDC checksum present!"));
 481                 return EINVAL;
 482         }
 483         if (!srv_checksum) {
 484                 DEBUG(2, ("Invalid PAC constructed for signing, no SRV checksum present!"));
 485                 return EINVAL;
 486         }
 487
 488         /* But wipe out the actual signatures */
 489         memset(kdc_checksum->signature.data, '\0', kdc_checksum->signature.length);
 490         memset(srv_checksum->signature.data, '\0', srv_checksum->signature.length);
 491
 492         ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
 493                                        iconv_convenience,
 494                                        pac_data,
 495                                        (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
 496         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 497                 nt_status = ndr_map_error2ntstatus(ndr_err);
 498                 DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
 499                 talloc_free(pac_data);
 500                 return EINVAL;
 501         }
 502
 503         /* Then sign the result of the previous push, where the sig was zero'ed out */
 504         ret = make_pac_checksum(mem_ctx, &tmp_blob, srv_checksum,
 505                                 context, service_keyblock);
 506
 507         /* Then sign Server checksum */
 508         ret = make_pac_checksum(mem_ctx, &srv_checksum->signature, kdc_checksum, context, krbtgt_keyblock);
 509         if (ret) {
 510                 DEBUG(2, ("making krbtgt PAC checksum failed: %s\n",
 511                           smb_get_krb5_error_message(context, ret, mem_ctx)));
 512                 talloc_free(pac_data);
 513                 return ret;
 514         }
 515
 516         /* And push it out again, this time to the world.  This relies on determanistic pointer values */
 517         ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
 518                                        iconv_convenience,
 519                                        pac_data,
 520                                        (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
 521         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 522                 nt_status = ndr_map_error2ntstatus(ndr_err);
 523                 DEBUG(1, ("PAC (final) push failed: %s\n", nt_errstr(nt_status)));
 524                 talloc_free(pac_data);
 525                 return EINVAL;
 526         }
 527
 528         *pac = tmp_blob;
 529
 530         return ret;
 531 }
 532
 533
 534  krb5_error_code kerberos_create_pac(TALLOC_CTX *mem_ctx,
 535                                      struct smb_iconv_convenience *iconv_convenience,
 536                                      struct auth_serversupplied_info *server_info,
 537                                      krb5_context context,
 538                                      const krb5_keyblock *krbtgt_keyblock,
 539                                      const krb5_keyblock *service_keyblock,
 540                                      krb5_principal client_principal,
 541                                      time_t tgs_authtime,
 542                                      DATA_BLOB *pac)
 543 {
 544         NTSTATUS nt_status;
 545         krb5_error_code ret;
 546         struct PAC_DATA *pac_data = talloc(mem_ctx, struct PAC_DATA);
 547         struct netr_SamInfo3 *sam3;
 548         union PAC_INFO *u_LOGON_INFO;
 549         struct PAC_LOGON_INFO *LOGON_INFO;
 550         union PAC_INFO *u_LOGON_NAME;
 551         struct PAC_LOGON_NAME *LOGON_NAME;
 552         union PAC_INFO *u_KDC_CHECKSUM;
 553         union PAC_INFO *u_SRV_CHECKSUM;
 554
 555         char *name;
 556
 557         enum {
 558                 PAC_BUF_LOGON_INFO = 0,
 559                 PAC_BUF_LOGON_NAME = 1,
 560                 PAC_BUF_SRV_CHECKSUM = 2,
 561                 PAC_BUF_KDC_CHECKSUM = 3,
 562                 PAC_BUF_NUM_BUFFERS = 4
 563         };
 564
 565         if (!pac_data) {
 566                 return ENOMEM;
 567         }
 568
 569         pac_data->num_buffers = PAC_BUF_NUM_BUFFERS;
 570         pac_data->version = 0;
 571
 572         pac_data->buffers = talloc_array(pac_data,
 573                                          struct PAC_BUFFER,
 574                                          pac_data->num_buffers);
 575         if (!pac_data->buffers) {
 576                 talloc_free(pac_data);
 577                 return ENOMEM;
 578         }
 579
 580         /* LOGON_INFO */
 581         u_LOGON_INFO = talloc_zero(pac_data->buffers, union PAC_INFO);
 582         if (!u_LOGON_INFO) {
 583                 talloc_free(pac_data);
 584                 return ENOMEM;
 585         }
 586         pac_data->buffers[PAC_BUF_LOGON_INFO].type = PAC_TYPE_LOGON_INFO;
 587         pac_data->buffers[PAC_BUF_LOGON_INFO].info = u_LOGON_INFO;
 588
 589         /* LOGON_NAME */
 590         u_LOGON_NAME = talloc_zero(pac_data->buffers, union PAC_INFO);
 591         if (!u_LOGON_NAME) {
 592                 talloc_free(pac_data);
 593                 return ENOMEM;
 594         }
 595         pac_data->buffers[PAC_BUF_LOGON_NAME].type = PAC_TYPE_LOGON_NAME;
 596         pac_data->buffers[PAC_BUF_LOGON_NAME].info = u_LOGON_NAME;
 597         LOGON_NAME = &u_LOGON_NAME->logon_name;
 598
 599         /* SRV_CHECKSUM */
 600         u_SRV_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
 601         if (!u_SRV_CHECKSUM) {
 602                 talloc_free(pac_data);
 603                 return ENOMEM;
 604         }
 605         pac_data->buffers[PAC_BUF_SRV_CHECKSUM].type = PAC_TYPE_SRV_CHECKSUM;
 606         pac_data->buffers[PAC_BUF_SRV_CHECKSUM].info = u_SRV_CHECKSUM;
 607
 608         /* KDC_CHECKSUM */
 609         u_KDC_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
 610         if (!u_KDC_CHECKSUM) {
 611                 talloc_free(pac_data);
 612                 return ENOMEM;
 613         }
 614         pac_data->buffers[PAC_BUF_KDC_CHECKSUM].type = PAC_TYPE_KDC_CHECKSUM;
 615         pac_data->buffers[PAC_BUF_KDC_CHECKSUM].info = u_KDC_CHECKSUM;
 616
 617         /* now the real work begins... */
 618
 619         LOGON_INFO = talloc_zero(u_LOGON_INFO, struct PAC_LOGON_INFO);
 620         if (!LOGON_INFO) {
 621                 talloc_free(pac_data);
 622                 return ENOMEM;
 623         }
 624         nt_status = auth_convert_server_info_saminfo3(LOGON_INFO, server_info, &sam3);
 625         if (!NT_STATUS_IS_OK(nt_status)) {
 626                 DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
 627                 talloc_free(pac_data);
 628                 return EINVAL;
 629         }
 630
 631         u_LOGON_INFO->logon_info.info           = LOGON_INFO;
 632         LOGON_INFO->info3 = *sam3;
 633
 634         ret = krb5_unparse_name_flags(context, client_principal,
 635                                       KRB5_PRINCIPAL_UNPARSE_NO_REALM, &name);
 636         if (ret) {
 637                 return ret;
 638         }
 639         LOGON_NAME->account_name        = talloc_strdup(LOGON_NAME, name);
 640         free(name);
 641         /*
 642           this logon_time field is absolutely critical. This is what
 643           caused all our PAC troubles :-)
 644         */
 645         unix_to_nt_time(&LOGON_NAME->logon_time, tgs_authtime);
 646
 647         ret = kerberos_encode_pac(mem_ctx,
 648                                   iconv_convenience,
 649                                   pac_data,
 650                                   context,
 651                                   krbtgt_keyblock,
 652                                   service_keyblock,
 653                                   pac);
 654         talloc_free(pac_data);
 655         return ret;
 656 }
 657
 658 krb5_error_code kerberos_pac_to_server_info(TALLOC_CTX *mem_ctx,
 659                                                 struct smb_iconv_convenience *iconv_convenience,
 660                                                 krb5_pac pac,
 661                                                 krb5_context context,
 662                                                 struct auth_serversupplied_info **server_info)
 663 {
 664         NTSTATUS nt_status;
 665         enum ndr_err_code ndr_err;
 666         krb5_error_code ret;
 667
 668         DATA_BLOB pac_logon_info_in, pac_srv_checksum_in, pac_kdc_checksum_in;
 669         krb5_data k5pac_logon_info_in, k5pac_srv_checksum_in, k5pac_kdc_checksum_in;
 670
 671         union PAC_INFO info;
 672         union netr_Validation validation;
 673         struct auth_serversupplied_info *server_info_out;
 674
 675         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 676
 677         if (!tmp_ctx) {
 678                 return ENOMEM;
 679         }
 680
 681         ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_LOGON_INFO, &k5pac_logon_info_in);
 682         if (ret != 0) {
 683                 talloc_free(tmp_ctx);
 684                 return EINVAL;
 685         }
 686
 687         pac_logon_info_in = data_blob_const(k5pac_logon_info_in.data, k5pac_logon_info_in.length);
 688
 689         ndr_err = ndr_pull_union_blob(&pac_logon_info_in, tmp_ctx, iconv_convenience, &info,
 690                                       PAC_TYPE_LOGON_INFO,
 691                                       (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
 692         krb5_data_free(&k5pac_logon_info_in);
 693         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err) || !info.logon_info.info) {
 694                 nt_status = ndr_map_error2ntstatus(ndr_err);
 695                 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 696                 talloc_free(tmp_ctx);
 697                 return EINVAL;
 698         }
 699
 700         /* Pull this right into the normal auth sysstem structures */
 701         validation.sam3 = &info.logon_info.info->info3;
 702         nt_status = make_server_info_netlogon_validation(mem_ctx,
 703                                                          "",
 704                                                          3, &validation,
 705                                                          &server_info_out);
 706         if (!NT_STATUS_IS_OK(nt_status)) {
 707                 talloc_free(tmp_ctx);
 708                 return EINVAL;
 709         }
 710
 711         ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_SRV_CHECKSUM, &k5pac_srv_checksum_in);
 712         if (ret != 0) {
 713                 talloc_free(tmp_ctx);
 714                 return ret;
 715         }
 716
 717         pac_srv_checksum_in = data_blob_const(k5pac_srv_checksum_in.data, k5pac_srv_checksum_in.length);
 718
 719         ndr_err = ndr_pull_struct_blob(&pac_srv_checksum_in, server_info_out,
 720                                        iconv_convenience, &server_info_out->pac_srv_sig,
 721                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
 722         krb5_data_free(&k5pac_srv_checksum_in);
 723         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 724                 nt_status = ndr_map_error2ntstatus(ndr_err);
 725                 DEBUG(0,("can't parse the KDC signature: %s\n",
 726                         nt_errstr(nt_status)));
 727                 return EINVAL;
 728         }
 729
 730         ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_KDC_CHECKSUM, &k5pac_kdc_checksum_in);
 731         if (ret != 0) {
 732                 talloc_free(tmp_ctx);
 733                 return ret;
 734         }
 735
 736         pac_kdc_checksum_in = data_blob_const(k5pac_kdc_checksum_in.data, k5pac_kdc_checksum_in.length);
 737
 738         ndr_err = ndr_pull_struct_blob(&pac_kdc_checksum_in, server_info_out,
 739                                        iconv_convenience, &server_info_out->pac_kdc_sig,
 740                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
 741         krb5_data_free(&k5pac_kdc_checksum_in);
 742         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 743                 nt_status = ndr_map_error2ntstatus(ndr_err);
 744                 DEBUG(0,("can't parse the KDC signature: %s\n",
 745                         nt_errstr(nt_status)));
 746                 return EINVAL;
 747         }
 748
 749         *server_info = server_info_out;
 750
 751         return 0;
 752 }
 753
 754
 755 NTSTATUS kerberos_pac_blob_to_server_info(TALLOC_CTX *mem_ctx,
 756                                                      struct smb_iconv_convenience *iconv_convenience,
 757                                                      DATA_BLOB pac_blob,
 758                                                      krb5_context context,
 759                                                      struct auth_serversupplied_info **server_info)
 760 {
 761         krb5_error_code ret;
 762         krb5_pac pac;
 763         ret = krb5_pac_parse(context,
 764                              pac_blob.data, pac_blob.length,
 765                              &pac);
 766         if (ret) {
 767                 return map_nt_error_from_unix(ret);
 768         }
 769
 770
 771         ret = kerberos_pac_to_server_info(mem_ctx, iconv_convenience, pac, context, server_info);
 772         krb5_pac_free(context, pac);
 773         if (ret) {
 774                 return map_nt_error_from_unix(ret);
 775         }
 776         return NT_STATUS_OK;
 777 }