source4/auth/ntlmssp/ntlmssp_sign.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Version 3.0
   4  *  NTLMSSP Signing routines
   5  *  Copyright (C) Luke Kenneth Casson Leighton 1996-2001
   6  *  Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003-2005
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software Foundation,
  20  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include "includes.h"
  24 #include "auth/auth.h"
  25 #include "auth/ntlmssp/ntlmssp.h"
  26 #include "auth/ntlmssp/msrpc_parse.h"
  27 #include "lib/crypto/crypto.h"
  28
  29 #define CLI_SIGN "session key to client-to-server signing key magic constant"
  30 #define CLI_SEAL "session key to client-to-server sealing key magic constant"
  31 #define SRV_SIGN "session key to server-to-client signing key magic constant"
  32 #define SRV_SEAL "session key to server-to-client sealing key magic constant"
  33
  34 /**
  35  * Some notes on then NTLM2 code:
  36  *
  37  * NTLM2 is a AEAD system.  This means that the data encrypted is not
  38  * all the data that is signed.  In DCE-RPC case, the headers of the
  39  * DCE-RPC packets are also signed.  This prevents some of the
  40  * fun-and-games one might have by changing them.
  41  *
  42  */
  43
  44 static void calc_ntlmv2_key(TALLOC_CTX *mem_ctx,
  45                             DATA_BLOB *subkey,
  46                             DATA_BLOB session_key,
  47                             const char *constant)
  48 {
  49         struct MD5Context ctx3;
  50         *subkey = data_blob_talloc(mem_ctx, NULL, 16);
  51         MD5Init(&ctx3);
  52         MD5Update(&ctx3, session_key.data, session_key.length);
  53         MD5Update(&ctx3, (const uint8_t *)constant, strlen(constant)+1);
  54         MD5Final(subkey->data, &ctx3);
  55 }
  56
  57 enum ntlmssp_direction {
  58         NTLMSSP_SEND,
  59         NTLMSSP_RECEIVE
  60 };
  61
  62 static NTSTATUS ntlmssp_make_packet_signature(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  63                                               TALLOC_CTX *sig_mem_ctx,
  64                                               const uint8_t *data, size_t length,
  65                                               const uint8_t *whole_pdu, size_t pdu_length,
  66                                               enum ntlmssp_direction direction,
  67                                               DATA_BLOB *sig, BOOL encrypt_sig)
  68 {
  69         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
  70
  71                 HMACMD5Context ctx;
  72                 uint8_t digest[16];
  73                 uint8_t seq_num[4];
  74
  75                 *sig = data_blob_talloc(sig_mem_ctx, NULL, NTLMSSP_SIG_SIZE);
  76                 if (!sig->data) {
  77                         return NT_STATUS_NO_MEMORY;
  78                 }
  79
  80                 switch (direction) {
  81                 case NTLMSSP_SEND:
  82                         SIVAL(seq_num, 0, gensec_ntlmssp_state->crypt.ntlm2.send_seq_num);
  83                         gensec_ntlmssp_state->crypt.ntlm2.send_seq_num++;
  84                         hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
  85                                                  gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length, &ctx);
  86                         break;
  87                 case NTLMSSP_RECEIVE:
  88                         SIVAL(seq_num, 0, gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num);
  89                         gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num++;
  90                         hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
  91                                                  gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length, &ctx);
  92                         break;
  93                 }
  94                 hmac_md5_update(seq_num, sizeof(seq_num), &ctx);
  95                 hmac_md5_update(whole_pdu, pdu_length, &ctx);
  96                 hmac_md5_final(digest, &ctx);
  97
  98                 if (encrypt_sig && gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
  99                         switch (direction) {
 100                         case NTLMSSP_SEND:
 101                                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, digest, 8);
 102                                 break;
 103                         case NTLMSSP_RECEIVE:
 104                                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, digest, 8);
 105                                 break;
 106                         }
 107                 }
 108
 109                 SIVAL(sig->data, 0, NTLMSSP_SIGN_VERSION);
 110                 memcpy(sig->data + 4, digest, 8);
 111                 memcpy(sig->data + 12, seq_num, 4);
 112
 113         } else {
 114                 uint32_t crc;
 115                 crc = crc32_calc_buffer(data, length);
 116                 if (!msrpc_gen(sig_mem_ctx, sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
 117                         return NT_STATUS_NO_MEMORY;
 118                 }
 119                 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
 120
 121                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
 122         }
 123         dump_data_pw("calculated ntlmssp signature\n", sig->data, sig->length);
 124         return NT_STATUS_OK;
 125 }
 126
 127 /* TODO: make this non-public */
 128 _PUBLIC_ NTSTATUS gensec_ntlmssp_sign_packet(struct gensec_security *gensec_security,
 129                                     TALLOC_CTX *sig_mem_ctx,
 130                                     const uint8_t *data, size_t length,
 131                                     const uint8_t *whole_pdu, size_t pdu_length,
 132                                     DATA_BLOB *sig)
 133 {
 134         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 135
 136         return ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 137                                              data, length,
 138                                              whole_pdu, pdu_length,
 139                                              NTLMSSP_SEND, sig, True);
 140 }
 141
 142 /**
 143  * Check the signature of an incoming packet
 144  *
 145  */
 146
 147 NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security,
 148                                      TALLOC_CTX *sig_mem_ctx,
 149                                      const uint8_t *data, size_t length,
 150                                      const uint8_t *whole_pdu, size_t pdu_length,
 151                                      const DATA_BLOB *sig)
 152 {
 153         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 154
 155         DATA_BLOB local_sig;
 156         NTSTATUS nt_status;
 157
 158         if (!gensec_ntlmssp_state->session_key.length) {
 159                 DEBUG(3, ("NO session key, cannot check packet signature\n"));
 160                 return NT_STATUS_NO_USER_SESSION_KEY;
 161         }
 162
 163         if (sig->length < 8) {
 164                 DEBUG(0, ("NTLMSSP packet check failed due to short signature (%lu bytes)!\n",
 165                           (unsigned long)sig->length));
 166         }
 167
 168         nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 169                                                   data, length,
 170                                                   whole_pdu, pdu_length,
 171                                                   NTLMSSP_RECEIVE, &local_sig, True);
 172
 173         if (!NT_STATUS_IS_OK(nt_status)) {
 174                 DEBUG(0, ("NTLMSSP packet check failed with %s\n", nt_errstr(nt_status)));
 175                 return nt_status;
 176         }
 177
 178         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 179                 if (local_sig.length != sig->length ||
 180                     memcmp(local_sig.data,
 181                            sig->data, sig->length) != 0) {
 182                         DEBUG(5, ("BAD SIG NTLM2: wanted signature of\n"));
 183                         dump_data(5, local_sig.data, local_sig.length);
 184
 185                         DEBUG(5, ("BAD SIG: got signature of\n"));
 186                         dump_data(5, sig->data, sig->length);
 187
 188                         DEBUG(0, ("NTLMSSP NTLM2 packet check failed due to invalid signature!\n"));
 189                         return NT_STATUS_ACCESS_DENIED;
 190                 }
 191         } else {
 192                 if (local_sig.length != sig->length ||
 193                     memcmp(local_sig.data + 8,
 194                            sig->data + 8, sig->length - 8) != 0) {
 195                         DEBUG(5, ("BAD SIG NTLM1: wanted signature of\n"));
 196                         dump_data(5, local_sig.data, local_sig.length);
 197
 198                         DEBUG(5, ("BAD SIG: got signature of\n"));
 199                         dump_data(5, sig->data, sig->length);
 200
 201                         DEBUG(0, ("NTLMSSP NTLM1 packet check failed due to invalid signature!\n"));
 202                         return NT_STATUS_ACCESS_DENIED;
 203                 }
 204         }
 205         dump_data_pw("checked ntlmssp signature\n", sig->data, sig->length);
 206
 207         return NT_STATUS_OK;
 208 }
 209
 210
 211 /**
 212  * Seal data with the NTLMSSP algorithm
 213  *
 214  */
 215
 216 NTSTATUS gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security,
 217                                     TALLOC_CTX *sig_mem_ctx,
 218                                     uint8_t *data, size_t length,
 219                                     const uint8_t *whole_pdu, size_t pdu_length,
 220                                     DATA_BLOB *sig)
 221 {
 222         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 223         NTSTATUS nt_status;
 224         if (!gensec_ntlmssp_state->session_key.length) {
 225                 DEBUG(3, ("NO session key, cannot seal packet\n"));
 226                 return NT_STATUS_NO_USER_SESSION_KEY;
 227         }
 228
 229         DEBUG(10,("ntlmssp_seal_data: seal\n"));
 230         dump_data_pw("ntlmssp clear data\n", data, length);
 231         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 232                 /* The order of these two operations matters - we must first seal the packet,
 233                    then seal the sequence number - this is becouse the send_seal_hash is not
 234                    constant, but is is rather updated with each iteration */
 235                 nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 236                                                           data, length,
 237                                                           whole_pdu, pdu_length,
 238                                                           NTLMSSP_SEND, sig, False);
 239                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, data, length);
 240                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 241                         arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, sig->data+4, 8);
 242                 }
 243         } else {
 244                 uint32_t crc;
 245                 crc = crc32_calc_buffer(data, length);
 246                 if (!msrpc_gen(sig_mem_ctx, sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
 247                         return NT_STATUS_NO_MEMORY;
 248                 }
 249
 250                 /* The order of these two operations matters - we must
 251                    first seal the packet, then seal the sequence
 252                    number - this is becouse the ntlmssp_hash is not
 253                    constant, but is is rather updated with each
 254                    iteration */
 255
 256                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
 257                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
 258                 /* increment counter on send */
 259                 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
 260                 nt_status = NT_STATUS_OK;
 261         }
 262         dump_data_pw("ntlmssp signature\n", sig->data, sig->length);
 263         dump_data_pw("ntlmssp sealed data\n", data, length);
 264
 265
 266         return nt_status;
 267 }
 268
 269 /**
 270  * Unseal data with the NTLMSSP algorithm
 271  *
 272  */
 273
 274 /*
 275   wrappers for the ntlmssp_*() functions
 276 */
 277 NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security,
 278                                       TALLOC_CTX *sig_mem_ctx,
 279                                       uint8_t *data, size_t length,
 280                                       const uint8_t *whole_pdu, size_t pdu_length,
 281                                       const DATA_BLOB *sig)
 282 {
 283         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 284         if (!gensec_ntlmssp_state->session_key.length) {
 285                 DEBUG(3, ("NO session key, cannot unseal packet\n"));
 286                 return NT_STATUS_NO_USER_SESSION_KEY;
 287         }
 288
 289         dump_data_pw("ntlmssp sealed data\n", data, length);
 290         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 291                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, data, length);
 292         } else {
 293                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
 294         }
 295         dump_data_pw("ntlmssp clear data\n", data, length);
 296         return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx, data, length, whole_pdu, pdu_length, sig);
 297 }
 298
 299 /**
 300    Initialise the state for NTLMSSP signing.
 301 */
 302 /* TODO: make this non-public */
 303 _PUBLIC_ NTSTATUS ntlmssp_sign_init(struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 304 {
 305         TALLOC_CTX *mem_ctx = talloc_new(gensec_ntlmssp_state);
 306
 307         if (!mem_ctx) {
 308                 return NT_STATUS_NO_MEMORY;
 309         }
 310
 311         DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
 312         debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
 313
 314         if (gensec_ntlmssp_state->session_key.length < 8) {
 315                 talloc_free(mem_ctx);
 316                 DEBUG(3, ("NO session key, cannot intialise signing\n"));
 317                 return NT_STATUS_NO_USER_SESSION_KEY;
 318         }
 319
 320         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
 321         {
 322                 DATA_BLOB weak_session_key = gensec_ntlmssp_state->session_key;
 323                 const char *send_sign_const;
 324                 const char *send_seal_const;
 325                 const char *recv_sign_const;
 326                 const char *recv_seal_const;
 327
 328                 DATA_BLOB send_seal_key;
 329                 DATA_BLOB recv_seal_key;
 330
 331                 switch (gensec_ntlmssp_state->role) {
 332                 case NTLMSSP_CLIENT:
 333                         send_sign_const = CLI_SIGN;
 334                         send_seal_const = CLI_SEAL;
 335                         recv_sign_const = SRV_SIGN;
 336                         recv_seal_const = SRV_SEAL;
 337                         break;
 338                 case NTLMSSP_SERVER:
 339                         send_sign_const = SRV_SIGN;
 340                         send_seal_const = SRV_SEAL;
 341                         recv_sign_const = CLI_SIGN;
 342                         recv_seal_const = CLI_SEAL;
 343                         break;
 344                 default:
 345                         talloc_free(mem_ctx);
 346                         return NT_STATUS_INTERNAL_ERROR;
 347                 }
 348
 349                 gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 350                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
 351                 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 352                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
 353
 354                 /**
 355                    Weaken NTLMSSP keys to cope with down-level
 356                    clients, servers and export restrictions.
 357
 358                    We probably should have some parameters to control
 359                    this, once we get NTLM2 working.
 360                 */
 361
 362                 /* Key weakening was not performed on the master key
 363                  * for NTLM2 (in ntlmssp_weaken_keys()), but must be
 364                  * done on the encryption subkeys only.  That is why
 365                  * we don't have this code for the ntlmv1 case.
 366                  */
 367
 368                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
 369
 370                 } else if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 371                         weak_session_key.length = 7;
 372                 } else { /* forty bits */
 373                         weak_session_key.length = 5;
 374                 }
 375                 dump_data_pw("NTLMSSP weakend master key:\n",
 376                              weak_session_key.data,
 377                              weak_session_key.length);
 378
 379                 /* SEND: sign key */
 380                 calc_ntlmv2_key(gensec_ntlmssp_state,
 381                                 &gensec_ntlmssp_state->crypt.ntlm2.send_sign_key,
 382                                 gensec_ntlmssp_state->session_key, send_sign_const);
 383                 dump_data_pw("NTLMSSP send sign key:\n",
 384                              gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
 385                              gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length);
 386
 387                 /* SEND: seal ARCFOUR pad */
 388                 calc_ntlmv2_key(mem_ctx,
 389                                 &send_seal_key,
 390                                 weak_session_key, send_seal_const);
 391                 dump_data_pw("NTLMSSP send seal key:\n",
 392                              send_seal_key.data,
 393                              send_seal_key.length);
 394                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state,
 395                              &send_seal_key);
 396                 dump_data_pw("NTLMSSP send sesl hash:\n",
 397                              gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox,
 398                              sizeof(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox));
 399
 400                 /* RECV: sign key */
 401                 calc_ntlmv2_key(gensec_ntlmssp_state,
 402                                 &gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key,
 403                                 gensec_ntlmssp_state->session_key, recv_sign_const);
 404                 dump_data_pw("NTLMSSP recv sign key:\n",
 405                              gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
 406                              gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length);
 407
 408                 /* RECV: seal ARCFOUR pad */
 409                 calc_ntlmv2_key(mem_ctx,
 410                                 &recv_seal_key,
 411                                 weak_session_key, recv_seal_const);
 412                 dump_data_pw("NTLMSSP recv seal key:\n",
 413                              recv_seal_key.data,
 414                              recv_seal_key.length);
 415                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state,
 416                              &recv_seal_key);
 417                 dump_data_pw("NTLMSSP receive seal hash:\n",
 418                              gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox,
 419                              sizeof(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox));
 420
 421                 gensec_ntlmssp_state->crypt.ntlm2.send_seq_num = 0;
 422                 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = 0;
 423
 424         } else {
 425                 DATA_BLOB weak_session_key = ntlmssp_weakend_key(gensec_ntlmssp_state, mem_ctx);
 426                 DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
 427
 428                 gensec_ntlmssp_state->crypt.ntlm.arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 429                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm.arcfour_state);
 430
 431                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm.arcfour_state,
 432                              &weak_session_key);
 433                 dump_data_pw("NTLMSSP hash:\n", gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox,
 434                              sizeof(gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox));
 435
 436                 gensec_ntlmssp_state->crypt.ntlm.seq_num = 0;
 437         }
 438
 439         talloc_free(mem_ctx);
 440         return NT_STATUS_OK;
 441 }
 442
 443 size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security, size_t data_size)
 444 {
 445         return NTLMSSP_SIG_SIZE;
 446 }
 447
 448 NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security,
 449                              TALLOC_CTX *sig_mem_ctx,
 450                              const DATA_BLOB *in,
 451                              DATA_BLOB *out)
 452 {
 453         DATA_BLOB sig;
 454         NTSTATUS nt_status;
 455
 456         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 457
 458                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 459                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 460
 461                 nt_status = gensec_ntlmssp_seal_packet(gensec_security, sig_mem_ctx,
 462                                                        out->data + NTLMSSP_SIG_SIZE,
 463                                                        out->length - NTLMSSP_SIG_SIZE,
 464                                                        out->data + NTLMSSP_SIG_SIZE,
 465                                                        out->length - NTLMSSP_SIG_SIZE,
 466                                                        &sig);
 467
 468                 if (NT_STATUS_IS_OK(nt_status)) {
 469                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 470                 }
 471                 return nt_status;
 472
 473         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 474
 475                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 476                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 477
 478                 nt_status = gensec_ntlmssp_sign_packet(gensec_security, sig_mem_ctx,
 479                                                        out->data + NTLMSSP_SIG_SIZE,
 480                                                        out->length - NTLMSSP_SIG_SIZE,
 481                                                        out->data + NTLMSSP_SIG_SIZE,
 482                                                        out->length - NTLMSSP_SIG_SIZE,
 483                                                        &sig);
 484
 485                 if (NT_STATUS_IS_OK(nt_status)) {
 486                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 487                 }
 488                 return nt_status;
 489
 490         } else {
 491                 *out = *in;
 492                 return NT_STATUS_OK;
 493         }
 494 }
 495
 496
 497 NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security,
 498                                TALLOC_CTX *sig_mem_ctx,
 499                                const DATA_BLOB *in,
 500                                DATA_BLOB *out)
 501 {
 502         DATA_BLOB sig;
 503
 504         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 505                 if (in->length < NTLMSSP_SIG_SIZE) {
 506                         return NT_STATUS_INVALID_PARAMETER;
 507                 }
 508                 sig.data = in->data;
 509                 sig.length = NTLMSSP_SIG_SIZE;
 510
 511                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 512
 513                 return gensec_ntlmssp_unseal_packet(gensec_security, sig_mem_ctx,
 514                                                     out->data, out->length,
 515                                                     out->data, out->length,
 516                                                     &sig);
 517
 518         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 519                 if (in->length < NTLMSSP_SIG_SIZE) {
 520                         return NT_STATUS_INVALID_PARAMETER;
 521                 }
 522                 sig.data = in->data;
 523                 sig.length = NTLMSSP_SIG_SIZE;
 524
 525                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 526
 527                 return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx,
 528                                                    out->data, out->length,
 529                                                    out->data, out->length,
 530                                                    &sig);
 531         } else {
 532                 *out = *in;
 533                 return NT_STATUS_OK;
 534         }
 535 }
 536