libcli/auth/credentials.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    code to manipulate domain credentials
   5
   6    Copyright (C) Andrew Tridgell 1997-2003
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
   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    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "system/time.h"
  25 #include "../lib/crypto/crypto.h"
  26 #include "libcli/auth/libcli_auth.h"
  27 #include "../libcli/security/dom_sid.h"
  28
  29 static void netlogon_creds_step_crypt(struct netlogon_creds_CredentialState *creds,
  30                                       const struct netr_Credential *in,
  31                                       struct netr_Credential *out)
  32 {
  33         if (creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
  34                 AES_KEY key;
  35                 uint8_t iv[AES_BLOCK_SIZE];
  36
  37                 AES_set_encrypt_key(creds->session_key, 128, &key);
  38                 ZERO_STRUCT(iv);
  39
  40                 aes_cfb8_encrypt(in->data, out->data, 8, &key, iv, AES_ENCRYPT);
  41         } else {
  42                 des_crypt112(out->data, in->data, creds->session_key, 1);
  43         }
  44 }
  45
  46 /*
  47   initialise the credentials state for old-style 64 bit session keys
  48
  49   this call is made after the netr_ServerReqChallenge call
  50 */
  51 static void netlogon_creds_init_64bit(struct netlogon_creds_CredentialState *creds,
  52                                       const struct netr_Credential *client_challenge,
  53                                       const struct netr_Credential *server_challenge,
  54                                       const struct samr_Password *machine_password)
  55 {
  56         uint32_t sum[2];
  57         uint8_t sum2[8];
  58
  59         sum[0] = IVAL(client_challenge->data, 0) + IVAL(server_challenge->data, 0);
  60         sum[1] = IVAL(client_challenge->data, 4) + IVAL(server_challenge->data, 4);
  61
  62         SIVAL(sum2,0,sum[0]);
  63         SIVAL(sum2,4,sum[1]);
  64
  65         ZERO_STRUCT(creds->session_key);
  66
  67         des_crypt128(creds->session_key, sum2, machine_password->hash);
  68 }
  69
  70 /*
  71   initialise the credentials state for ADS-style 128 bit session keys
  72
  73   this call is made after the netr_ServerReqChallenge call
  74 */
  75 static void netlogon_creds_init_128bit(struct netlogon_creds_CredentialState *creds,
  76                                        const struct netr_Credential *client_challenge,
  77                                        const struct netr_Credential *server_challenge,
  78                                        const struct samr_Password *machine_password)
  79 {
  80         unsigned char zero[4], tmp[16];
  81         HMACMD5Context ctx;
  82         MD5_CTX md5;
  83
  84         ZERO_STRUCT(creds->session_key);
  85
  86         memset(zero, 0, sizeof(zero));
  87
  88         hmac_md5_init_rfc2104(machine_password->hash, sizeof(machine_password->hash), &ctx);
  89         MD5Init(&md5);
  90         MD5Update(&md5, zero, sizeof(zero));
  91         MD5Update(&md5, client_challenge->data, 8);
  92         MD5Update(&md5, server_challenge->data, 8);
  93         MD5Final(tmp, &md5);
  94         hmac_md5_update(tmp, sizeof(tmp), &ctx);
  95         hmac_md5_final(creds->session_key, &ctx);
  96 }
  97
  98 /*
  99   initialise the credentials state for AES/HMAC-SHA256-style 128 bit session keys
 100
 101   this call is made after the netr_ServerReqChallenge call
 102 */
 103 static void netlogon_creds_init_hmac_sha256(struct netlogon_creds_CredentialState *creds,
 104                                             const struct netr_Credential *client_challenge,
 105                                             const struct netr_Credential *server_challenge,
 106                                             const struct samr_Password *machine_password)
 107 {
 108         struct HMACSHA256Context ctx;
 109         uint8_t digest[SHA256_DIGEST_LENGTH];
 110
 111         ZERO_STRUCT(creds->session_key);
 112
 113         hmac_sha256_init(machine_password->hash,
 114                          sizeof(machine_password->hash),
 115                          &ctx);
 116         hmac_sha256_update(client_challenge->data, 8, &ctx);
 117         hmac_sha256_update(server_challenge->data, 8, &ctx);
 118         hmac_sha256_final(digest, &ctx);
 119
 120         memcpy(creds->session_key, digest, sizeof(creds->session_key));
 121
 122         ZERO_STRUCT(digest);
 123         ZERO_STRUCT(ctx);
 124 }
 125
 126 static void netlogon_creds_first_step(struct netlogon_creds_CredentialState *creds,
 127                                       const struct netr_Credential *client_challenge,
 128                                       const struct netr_Credential *server_challenge)
 129 {
 130         netlogon_creds_step_crypt(creds, client_challenge, &creds->client);
 131
 132         netlogon_creds_step_crypt(creds, server_challenge, &creds->server);
 133
 134         creds->seed = creds->client;
 135 }
 136
 137 /*
 138   step the credentials to the next element in the chain, updating the
 139   current client and server credentials and the seed
 140 */
 141 static void netlogon_creds_step(struct netlogon_creds_CredentialState *creds)
 142 {
 143         struct netr_Credential time_cred;
 144
 145         DEBUG(5,("\tseed        %08x:%08x\n",
 146                  IVAL(creds->seed.data, 0), IVAL(creds->seed.data, 4)));
 147
 148         SIVAL(time_cred.data, 0, IVAL(creds->seed.data, 0) + creds->sequence);
 149         SIVAL(time_cred.data, 4, IVAL(creds->seed.data, 4));
 150
 151         DEBUG(5,("\tseed+time   %08x:%08x\n", IVAL(time_cred.data, 0), IVAL(time_cred.data, 4)));
 152
 153         netlogon_creds_step_crypt(creds, &time_cred, &creds->client);
 154
 155         DEBUG(5,("\tCLIENT      %08x:%08x\n",
 156                  IVAL(creds->client.data, 0), IVAL(creds->client.data, 4)));
 157
 158         SIVAL(time_cred.data, 0, IVAL(creds->seed.data, 0) + creds->sequence + 1);
 159         SIVAL(time_cred.data, 4, IVAL(creds->seed.data, 4));
 160
 161         DEBUG(5,("\tseed+time+1 %08x:%08x\n",
 162                  IVAL(time_cred.data, 0), IVAL(time_cred.data, 4)));
 163
 164         netlogon_creds_step_crypt(creds, &time_cred, &creds->server);
 165
 166         DEBUG(5,("\tSERVER      %08x:%08x\n",
 167                  IVAL(creds->server.data, 0), IVAL(creds->server.data, 4)));
 168
 169         creds->seed = time_cred;
 170 }
 171
 172
 173 /*
 174   DES encrypt a 8 byte LMSessionKey buffer using the Netlogon session key
 175 */
 176 void netlogon_creds_des_encrypt_LMKey(struct netlogon_creds_CredentialState *creds, struct netr_LMSessionKey *key)
 177 {
 178         struct netr_LMSessionKey tmp;
 179         des_crypt56(tmp.key, key->key, creds->session_key, 1);
 180         *key = tmp;
 181 }
 182
 183 /*
 184   DES decrypt a 8 byte LMSessionKey buffer using the Netlogon session key
 185 */
 186 void netlogon_creds_des_decrypt_LMKey(struct netlogon_creds_CredentialState *creds, struct netr_LMSessionKey *key)
 187 {
 188         struct netr_LMSessionKey tmp;
 189         des_crypt56(tmp.key, key->key, creds->session_key, 0);
 190         *key = tmp;
 191 }
 192
 193 /*
 194   DES encrypt a 16 byte password buffer using the session key
 195 */
 196 void netlogon_creds_des_encrypt(struct netlogon_creds_CredentialState *creds, struct samr_Password *pass)
 197 {
 198         struct samr_Password tmp;
 199         des_crypt112_16(tmp.hash, pass->hash, creds->session_key, 1);
 200         *pass = tmp;
 201 }
 202
 203 /*
 204   DES decrypt a 16 byte password buffer using the session key
 205 */
 206 void netlogon_creds_des_decrypt(struct netlogon_creds_CredentialState *creds, struct samr_Password *pass)
 207 {
 208         struct samr_Password tmp;
 209         des_crypt112_16(tmp.hash, pass->hash, creds->session_key, 0);
 210         *pass = tmp;
 211 }
 212
 213 /*
 214   ARCFOUR encrypt/decrypt a password buffer using the session key
 215 */
 216 void netlogon_creds_arcfour_crypt(struct netlogon_creds_CredentialState *creds, uint8_t *data, size_t len)
 217 {
 218         DATA_BLOB session_key = data_blob(creds->session_key, 16);
 219
 220         arcfour_crypt_blob(data, len, &session_key);
 221
 222         data_blob_free(&session_key);
 223 }
 224
 225 /*
 226   AES encrypt a password buffer using the session key
 227 */
 228 void netlogon_creds_aes_encrypt(struct netlogon_creds_CredentialState *creds, uint8_t *data, size_t len)
 229 {
 230         AES_KEY key;
 231         uint8_t iv[AES_BLOCK_SIZE];
 232
 233         AES_set_encrypt_key(creds->session_key, 128, &key);
 234         ZERO_STRUCT(iv);
 235
 236         aes_cfb8_encrypt(data, data, len, &key, iv, AES_ENCRYPT);
 237 }
 238
 239 /*
 240   AES decrypt a password buffer using the session key
 241 */
 242 void netlogon_creds_aes_decrypt(struct netlogon_creds_CredentialState *creds, uint8_t *data, size_t len)
 243 {
 244         AES_KEY key;
 245         uint8_t iv[AES_BLOCK_SIZE];
 246
 247         AES_set_encrypt_key(creds->session_key, 128, &key);
 248         ZERO_STRUCT(iv);
 249
 250         aes_cfb8_encrypt(data, data, len, &key, iv, AES_DECRYPT);
 251 }
 252
 253 /*****************************************************************
 254 The above functions are common to the client and server interface
 255 next comes the client specific functions
 256 ******************************************************************/
 257
 258 /*
 259   initialise the credentials chain and return the first client
 260   credentials
 261 */
 262
 263 struct netlogon_creds_CredentialState *netlogon_creds_client_init(TALLOC_CTX *mem_ctx,
 264                                                                   const char *client_account,
 265                                                                   const char *client_computer_name,
 266                                                                   uint16_t secure_channel_type,
 267                                                                   const struct netr_Credential *client_challenge,
 268                                                                   const struct netr_Credential *server_challenge,
 269                                                                   const struct samr_Password *machine_password,
 270                                                                   struct netr_Credential *initial_credential,
 271                                                                   uint32_t negotiate_flags)
 272 {
 273         struct netlogon_creds_CredentialState *creds = talloc_zero(mem_ctx, struct netlogon_creds_CredentialState);
 274
 275         if (!creds) {
 276                 return NULL;
 277         }
 278
 279         creds->sequence = time(NULL);
 280         creds->negotiate_flags = negotiate_flags;
 281         creds->secure_channel_type = secure_channel_type;
 282
 283         creds->computer_name = talloc_strdup(creds, client_computer_name);
 284         if (!creds->computer_name) {
 285                 talloc_free(creds);
 286                 return NULL;
 287         }
 288         creds->account_name = talloc_strdup(creds, client_account);
 289         if (!creds->account_name) {
 290                 talloc_free(creds);
 291                 return NULL;
 292         }
 293
 294         dump_data_pw("Client chall", client_challenge->data, sizeof(client_challenge->data));
 295         dump_data_pw("Server chall", server_challenge->data, sizeof(server_challenge->data));
 296         dump_data_pw("Machine Pass", machine_password->hash, sizeof(machine_password->hash));
 297
 298         if (negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
 299                 netlogon_creds_init_hmac_sha256(creds,
 300                                                 client_challenge,
 301                                                 server_challenge,
 302                                                 machine_password);
 303         } else if (negotiate_flags & NETLOGON_NEG_STRONG_KEYS) {
 304                 netlogon_creds_init_128bit(creds, client_challenge, server_challenge, machine_password);
 305         } else {
 306                 netlogon_creds_init_64bit(creds, client_challenge, server_challenge, machine_password);
 307         }
 308
 309         netlogon_creds_first_step(creds, client_challenge, server_challenge);
 310
 311         dump_data_pw("Session key", creds->session_key, 16);
 312         dump_data_pw("Credential ", creds->client.data, 8);
 313
 314         *initial_credential = creds->client;
 315         return creds;
 316 }
 317
 318 /*
 319   initialise the credentials structure with only a session key.  The caller better know what they are doing!
 320  */
 321
 322 struct netlogon_creds_CredentialState *netlogon_creds_client_init_session_key(TALLOC_CTX *mem_ctx,
 323                                                                               const uint8_t session_key[16])
 324 {
 325         struct netlogon_creds_CredentialState *creds;
 326
 327         creds = talloc_zero(mem_ctx, struct netlogon_creds_CredentialState);
 328         if (!creds) {
 329                 return NULL;
 330         }
 331
 332         memcpy(creds->session_key, session_key, 16);
 333
 334         return creds;
 335 }
 336
 337 /*
 338   step the credentials to the next element in the chain, updating the
 339   current client and server credentials and the seed
 340
 341   produce the next authenticator in the sequence ready to send to
 342   the server
 343 */
 344 void netlogon_creds_client_authenticator(struct netlogon_creds_CredentialState *creds,
 345                                 struct netr_Authenticator *next)
 346 {
 347         creds->sequence += 2;
 348         netlogon_creds_step(creds);
 349
 350         next->cred = creds->client;
 351         next->timestamp = creds->sequence;
 352 }
 353
 354 /*
 355   check that a credentials reply from a server is correct
 356 */
 357 bool netlogon_creds_client_check(struct netlogon_creds_CredentialState *creds,
 358                         const struct netr_Credential *received_credentials)
 359 {
 360         if (!received_credentials ||
 361             memcmp(received_credentials->data, creds->server.data, 8) != 0) {
 362                 DEBUG(2,("credentials check failed\n"));
 363                 return false;
 364         }
 365         return true;
 366 }
 367
 368
 369 /*****************************************************************
 370 The above functions are common to the client and server interface
 371 next comes the server specific functions
 372 ******************************************************************/
 373
 374 /*
 375   check that a credentials reply from a server is correct
 376 */
 377 static bool netlogon_creds_server_check_internal(const struct netlogon_creds_CredentialState *creds,
 378                                                  const struct netr_Credential *received_credentials)
 379 {
 380         if (memcmp(received_credentials->data, creds->client.data, 8) != 0) {
 381                 DEBUG(2,("credentials check failed\n"));
 382                 dump_data_pw("client creds", creds->client.data, 8);
 383                 dump_data_pw("calc   creds", received_credentials->data, 8);
 384                 return false;
 385         }
 386         return true;
 387 }
 388
 389 /*
 390   initialise the credentials chain and return the first server
 391   credentials
 392 */
 393 struct netlogon_creds_CredentialState *netlogon_creds_server_init(TALLOC_CTX *mem_ctx,
 394                                                                   const char *client_account,
 395                                                                   const char *client_computer_name,
 396                                                                   uint16_t secure_channel_type,
 397                                                                   const struct netr_Credential *client_challenge,
 398                                                                   const struct netr_Credential *server_challenge,
 399                                                                   const struct samr_Password *machine_password,
 400                                                                   struct netr_Credential *credentials_in,
 401                                                                   struct netr_Credential *credentials_out,
 402                                                                   uint32_t negotiate_flags)
 403 {
 404
 405         struct netlogon_creds_CredentialState *creds = talloc_zero(mem_ctx, struct netlogon_creds_CredentialState);
 406
 407         if (!creds) {
 408                 return NULL;
 409         }
 410
 411         creds->negotiate_flags = negotiate_flags;
 412         creds->secure_channel_type = secure_channel_type;
 413
 414         dump_data_pw("Client chall", client_challenge->data, sizeof(client_challenge->data));
 415         dump_data_pw("Server chall", server_challenge->data, sizeof(server_challenge->data));
 416         dump_data_pw("Machine Pass", machine_password->hash, sizeof(machine_password->hash));
 417
 418         creds->computer_name = talloc_strdup(creds, client_computer_name);
 419         if (!creds->computer_name) {
 420                 talloc_free(creds);
 421                 return NULL;
 422         }
 423         creds->account_name = talloc_strdup(creds, client_account);
 424         if (!creds->account_name) {
 425                 talloc_free(creds);
 426                 return NULL;
 427         }
 428
 429         if (negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
 430                 netlogon_creds_init_hmac_sha256(creds,
 431                                                 client_challenge,
 432                                                 server_challenge,
 433                                                 machine_password);
 434         } else if (negotiate_flags & NETLOGON_NEG_STRONG_KEYS) {
 435                 netlogon_creds_init_128bit(creds, client_challenge, server_challenge,
 436                                            machine_password);
 437         } else {
 438                 netlogon_creds_init_64bit(creds, client_challenge, server_challenge,
 439                                           machine_password);
 440         }
 441
 442         netlogon_creds_first_step(creds, client_challenge, server_challenge);
 443
 444         dump_data_pw("Session key", creds->session_key, 16);
 445         dump_data_pw("Client Credential ", creds->client.data, 8);
 446         dump_data_pw("Server Credential ", creds->server.data, 8);
 447
 448         dump_data_pw("Credentials in", credentials_in->data, sizeof(credentials_in->data));
 449
 450         /* And before we leak information about the machine account
 451          * password, check that they got the first go right */
 452         if (!netlogon_creds_server_check_internal(creds, credentials_in)) {
 453                 talloc_free(creds);
 454                 return NULL;
 455         }
 456
 457         *credentials_out = creds->server;
 458
 459         dump_data_pw("Credentials out", credentials_out->data, sizeof(credentials_out->data));
 460
 461         return creds;
 462 }
 463
 464 NTSTATUS netlogon_creds_server_step_check(struct netlogon_creds_CredentialState *creds,
 465                                  struct netr_Authenticator *received_authenticator,
 466                                  struct netr_Authenticator *return_authenticator)
 467 {
 468         if (!received_authenticator || !return_authenticator) {
 469                 return NT_STATUS_INVALID_PARAMETER;
 470         }
 471
 472         if (!creds) {
 473                 return NT_STATUS_ACCESS_DENIED;
 474         }
 475
 476         /* TODO: this may allow the a replay attack on a non-signed
 477            connection. Should we check that this is increasing? */
 478         creds->sequence = received_authenticator->timestamp;
 479         netlogon_creds_step(creds);
 480         if (netlogon_creds_server_check_internal(creds, &received_authenticator->cred)) {
 481                 return_authenticator->cred = creds->server;
 482                 return_authenticator->timestamp = creds->sequence;
 483                 return NT_STATUS_OK;
 484         } else {
 485                 ZERO_STRUCTP(return_authenticator);
 486                 return NT_STATUS_ACCESS_DENIED;
 487         }
 488 }
 489
 490 static void netlogon_creds_crypt_samlogon_validation(struct netlogon_creds_CredentialState *creds,
 491                                                      uint16_t validation_level,
 492                                                      union netr_Validation *validation,
 493                                                      bool encrypt)
 494 {
 495         static const char zeros[16];
 496
 497         struct netr_SamBaseInfo *base = NULL;
 498         switch (validation_level) {
 499         case 2:
 500                 if (validation->sam2) {
 501                         base = &validation->sam2->base;
 502                 }
 503                 break;
 504         case 3:
 505                 if (validation->sam3) {
 506                         base = &validation->sam3->base;
 507                 }
 508                 break;
 509         case 6:
 510                 if (validation->sam6) {
 511                         base = &validation->sam6->base;
 512                 }
 513                 break;
 514         default:
 515                 /* If we can't find it, we can't very well decrypt it */
 516                 return;
 517         }
 518
 519         if (!base) {
 520                 return;
 521         }
 522
 523         /* find and decyrpt the session keys, return in parameters above */
 524         if (validation_level == 6) {
 525                 /* they aren't encrypted! */
 526         } else if (creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
 527                 /* Don't crypt an all-zero key, it would give away the NETLOGON pipe session key */
 528                 if (memcmp(base->key.key, zeros,
 529                            sizeof(base->key.key)) != 0) {
 530                         if (encrypt) {
 531                                 netlogon_creds_aes_encrypt(creds,
 532                                             base->key.key,
 533                                             sizeof(base->key.key));
 534                         } else {
 535                                 netlogon_creds_aes_decrypt(creds,
 536                                             base->key.key,
 537                                             sizeof(base->key.key));
 538                         }
 539                 }
 540
 541                 if (memcmp(base->LMSessKey.key, zeros,
 542                            sizeof(base->LMSessKey.key)) != 0) {
 543                         if (encrypt) {
 544                                 netlogon_creds_aes_encrypt(creds,
 545                                             base->LMSessKey.key,
 546                                             sizeof(base->LMSessKey.key));
 547
 548                         } else {
 549                                 netlogon_creds_aes_decrypt(creds,
 550                                             base->LMSessKey.key,
 551                                             sizeof(base->LMSessKey.key));
 552                         }
 553                 }
 554         } else if (creds->negotiate_flags & NETLOGON_NEG_ARCFOUR) {
 555                 /* Don't crypt an all-zero key, it would give away the NETLOGON pipe session key */
 556                 if (memcmp(base->key.key, zeros,
 557                            sizeof(base->key.key)) != 0) {
 558                         netlogon_creds_arcfour_crypt(creds,
 559                                             base->key.key,
 560                                             sizeof(base->key.key));
 561                 }
 562
 563                 if (memcmp(base->LMSessKey.key, zeros,
 564                            sizeof(base->LMSessKey.key)) != 0) {
 565                         netlogon_creds_arcfour_crypt(creds,
 566                                             base->LMSessKey.key,
 567                                             sizeof(base->LMSessKey.key));
 568                 }
 569         } else {
 570                 /* Don't crypt an all-zero key, it would give away the NETLOGON pipe session key */
 571                 if (memcmp(base->LMSessKey.key, zeros,
 572                            sizeof(base->LMSessKey.key)) != 0) {
 573                         if (encrypt) {
 574                                 netlogon_creds_des_encrypt_LMKey(creds,
 575                                                 &base->LMSessKey);
 576                         } else {
 577                                 netlogon_creds_des_decrypt_LMKey(creds,
 578                                                 &base->LMSessKey);
 579                         }
 580                 }
 581         }
 582 }
 583
 584 void netlogon_creds_decrypt_samlogon_validation(struct netlogon_creds_CredentialState *creds,
 585                                                 uint16_t validation_level,
 586                                                 union netr_Validation *validation)
 587 {
 588         netlogon_creds_crypt_samlogon_validation(creds, validation_level,
 589                                                         validation, false);
 590 }
 591
 592 void netlogon_creds_encrypt_samlogon_validation(struct netlogon_creds_CredentialState *creds,
 593                                                 uint16_t validation_level,
 594                                                 union netr_Validation *validation)
 595 {
 596         netlogon_creds_crypt_samlogon_validation(creds, validation_level,
 597                                                         validation, true);
 598 }
 599
 600 /*
 601   copy a netlogon_creds_CredentialState struct
 602 */
 603
 604 struct netlogon_creds_CredentialState *netlogon_creds_copy(TALLOC_CTX *mem_ctx,
 605                                                            struct netlogon_creds_CredentialState *creds_in)
 606 {
 607         struct netlogon_creds_CredentialState *creds = talloc_zero(mem_ctx, struct netlogon_creds_CredentialState);
 608
 609         if (!creds) {
 610                 return NULL;
 611         }
 612
 613         creds->sequence                 = creds_in->sequence;
 614         creds->negotiate_flags          = creds_in->negotiate_flags;
 615         creds->secure_channel_type      = creds_in->secure_channel_type;
 616
 617         creds->computer_name = talloc_strdup(creds, creds_in->computer_name);
 618         if (!creds->computer_name) {
 619                 talloc_free(creds);
 620                 return NULL;
 621         }
 622         creds->account_name = talloc_strdup(creds, creds_in->account_name);
 623         if (!creds->account_name) {
 624                 talloc_free(creds);
 625                 return NULL;
 626         }
 627
 628         if (creds_in->sid) {
 629                 creds->sid = dom_sid_dup(creds, creds_in->sid);
 630                 if (!creds->sid) {
 631                         talloc_free(creds);
 632                         return NULL;
 633                 }
 634         }
 635
 636         memcpy(creds->session_key, creds_in->session_key, sizeof(creds->session_key));
 637         memcpy(creds->seed.data, creds_in->seed.data, sizeof(creds->seed.data));
 638         memcpy(creds->client.data, creds_in->client.data, sizeof(creds->client.data));
 639         memcpy(creds->server.data, creds_in->server.data, sizeof(creds->server.data));
 640
 641         return creds;
 642 }