source/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 "lib/crypto/crypto.h"
  27
  28 #define CLI_SIGN "session key to client-to-server signing key magic constant"
  29 #define CLI_SEAL "session key to client-to-server sealing key magic constant"
  30 #define SRV_SIGN "session key to server-to-client signing key magic constant"
  31 #define SRV_SEAL "session key to server-to-client sealing key magic constant"
  32
  33 /**
  34  * Some notes on then NTLM2 code:
  35  *
  36  * NTLM2 is a AEAD system.  This means that the data encrypted is not
  37  * all the data that is signed.  In DCE-RPC case, the headers of the
  38  * DCE-RPC packets are also signed.  This prevents some of the
  39  * fun-and-games one might have by changing them.
  40  *
  41  */
  42
  43 static void calc_ntlmv2_key(TALLOC_CTX *mem_ctx,
  44                             DATA_BLOB *subkey,
  45                             DATA_BLOB session_key,
  46                             const char *constant)
  47 {
  48         struct MD5Context ctx3;
  49         *subkey = data_blob_talloc(mem_ctx, NULL, 16);
  50         MD5Init(&ctx3);
  51         MD5Update(&ctx3, session_key.data, session_key.length);
  52         MD5Update(&ctx3, constant, strlen(constant)+1);
  53         MD5Final(subkey->data, &ctx3);
  54 }
  55
  56 enum ntlmssp_direction {
  57         NTLMSSP_SEND,
  58         NTLMSSP_RECEIVE
  59 };
  60
  61 static NTSTATUS ntlmssp_make_packet_signature(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  62                                               TALLOC_CTX *sig_mem_ctx,
  63                                               const uint8_t *data, size_t length,
  64                                               const uint8_t *whole_pdu, size_t pdu_length,
  65                                               enum ntlmssp_direction direction,
  66                                               DATA_BLOB *sig, BOOL encrypt_sig)
  67 {
  68         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
  69
  70                 HMACMD5Context ctx;
  71                 uint8_t digest[16];
  72                 uint8_t seq_num[4];
  73
  74                 *sig = data_blob_talloc(sig_mem_ctx, NULL, NTLMSSP_SIG_SIZE);
  75                 if (!sig->data) {
  76                         return NT_STATUS_NO_MEMORY;
  77                 }
  78
  79                 switch (direction) {
  80                 case NTLMSSP_SEND:
  81                         SIVAL(seq_num, 0, gensec_ntlmssp_state->v.ntlm2.send_seq_num);
  82                         gensec_ntlmssp_state->v.ntlm2.send_seq_num++;
  83                         hmac_md5_init_limK_to_64(gensec_ntlmssp_state->v.ntlm2.send_sign_key.data,
  84                                                  gensec_ntlmssp_state->v.ntlm2.send_sign_key.length, &ctx);
  85                         break;
  86                 case NTLMSSP_RECEIVE:
  87                         SIVAL(seq_num, 0, gensec_ntlmssp_state->v.ntlm2.recv_seq_num);
  88                         gensec_ntlmssp_state->v.ntlm2.recv_seq_num++;
  89                         hmac_md5_init_limK_to_64(gensec_ntlmssp_state->v.ntlm2.recv_sign_key.data,
  90                                                  gensec_ntlmssp_state->v.ntlm2.recv_sign_key.length, &ctx);
  91                         break;
  92                 }
  93                 hmac_md5_update(seq_num, sizeof(seq_num), &ctx);
  94                 hmac_md5_update(whole_pdu, pdu_length, &ctx);
  95                 hmac_md5_final(digest, &ctx);
  96
  97                 if (encrypt_sig && gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
  98                         switch (direction) {
  99                         case NTLMSSP_SEND:
 100                                 arcfour_crypt_sbox(gensec_ntlmssp_state->v.ntlm2.send_seal_arcfour_state, digest, 8);
 101                                 break;
 102                         case NTLMSSP_RECEIVE:
 103                                 arcfour_crypt_sbox(gensec_ntlmssp_state->v.ntlm2.recv_seal_arcfour_state, digest, 8);
 104                                 break;
 105                         }
 106                 }
 107
 108                 SIVAL(sig->data, 0, NTLMSSP_SIGN_VERSION);
 109                 memcpy(sig->data + 4, digest, 8);
 110                 memcpy(sig->data + 12, seq_num, 4);
 111
 112         } else {
 113                 uint32_t crc;
 114                 crc = crc32_calc_buffer(data, length);
 115                 if (!msrpc_gen(sig_mem_ctx, sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->v.ntlm.seq_num)) {
 116                         return NT_STATUS_NO_MEMORY;
 117                 }
 118                 gensec_ntlmssp_state->v.ntlm.seq_num++;
 119
 120                 arcfour_crypt_sbox(gensec_ntlmssp_state->v.ntlm.arcfour_state, sig->data+4, sig->length-4);
 121         }
 122         dump_data_pw("calculated ntlmssp signature\n", sig->data, sig->length);
 123         return NT_STATUS_OK;
 124 }
 125
 126 NTSTATUS gensec_ntlmssp_sign_packet(struct gensec_security *gensec_security,
 127                                     TALLOC_CTX *sig_mem_ctx,
 128                                     const uint8_t *data, size_t length,
 129                                     const uint8_t *whole_pdu, size_t pdu_length,
 130                                     DATA_BLOB *sig)
 131 {
 132         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 133
 134         if (!gensec_ntlmssp_state->session_key.length) {
 135                 DEBUG(3, ("NO session key, cannot check sign packet\n"));
 136                 return NT_STATUS_NO_USER_SESSION_KEY;
 137         }
 138
 139         if (!gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
 140                 DEBUG(3, ("NTLMSSP Signing not negotiated - cannot sign packet!\n"));
 141                 return NT_STATUS_INVALID_PARAMETER;
 142         }
 143
 144         return ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 145                                              data, length,
 146                                              whole_pdu, pdu_length,
 147                                              NTLMSSP_SEND, sig, True);
 148 }
 149
 150 /**
 151  * Check the signature of an incoming packet
 152  *
 153  */
 154
 155 NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security,
 156                                      TALLOC_CTX *sig_mem_ctx,
 157                                      const uint8_t *data, size_t length,
 158                                      const uint8_t *whole_pdu, size_t pdu_length,
 159                                      const DATA_BLOB *sig)
 160 {
 161         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 162
 163         DATA_BLOB local_sig;
 164         NTSTATUS nt_status;
 165
 166         if (!gensec_ntlmssp_state->session_key.length) {
 167                 DEBUG(3, ("NO session key, cannot check packet signature\n"));
 168                 return NT_STATUS_NO_USER_SESSION_KEY;
 169         }
 170
 171         if (sig->length < 8) {
 172                 DEBUG(0, ("NTLMSSP packet check failed due to short signature (%lu bytes)!\n",
 173                           (unsigned long)sig->length));
 174         }
 175
 176         nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 177                                                   data, length,
 178                                                   whole_pdu, pdu_length,
 179                                                   NTLMSSP_RECEIVE, &local_sig, True);
 180
 181         if (!NT_STATUS_IS_OK(nt_status)) {
 182                 DEBUG(0, ("NTLMSSP packet check failed with %s\n", nt_errstr(nt_status)));
 183                 return nt_status;
 184         }
 185
 186         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 187                 if (local_sig.length != sig->length ||
 188                     memcmp(local_sig.data,
 189                            sig->data, sig->length) != 0) {
 190                         DEBUG(5, ("BAD SIG NTLM2: wanted signature of\n"));
 191                         dump_data(5, local_sig.data, local_sig.length);
 192
 193                         DEBUG(5, ("BAD SIG: got signature of\n"));
 194                         dump_data(5, sig->data, sig->length);
 195
 196                         DEBUG(0, ("NTLMSSP NTLM2 packet check failed due to invalid signature!\n"));
 197                         return NT_STATUS_ACCESS_DENIED;
 198                 }
 199         } else {
 200                 if (local_sig.length != sig->length ||
 201                     memcmp(local_sig.data + 8,
 202                            sig->data + 8, sig->length - 8) != 0) {
 203                         DEBUG(5, ("BAD SIG NTLM1: wanted signature of\n"));
 204                         dump_data(5, local_sig.data, local_sig.length);
 205
 206                         DEBUG(5, ("BAD SIG: got signature of\n"));
 207                         dump_data(5, sig->data, sig->length);
 208
 209                         DEBUG(0, ("NTLMSSP NTLM1 packet check failed due to invalid signature!\n"));
 210                         return NT_STATUS_ACCESS_DENIED;
 211                 }
 212         }
 213         dump_data_pw("checked ntlmssp signature\n", sig->data, sig->length);
 214
 215         return NT_STATUS_OK;
 216 }
 217
 218
 219 /**
 220  * Seal data with the NTLMSSP algorithm
 221  *
 222  */
 223
 224 NTSTATUS gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security,
 225                                     TALLOC_CTX *sig_mem_ctx,
 226                                     uint8_t *data, size_t length,
 227                                     const uint8_t *whole_pdu, size_t pdu_length,
 228                                     DATA_BLOB *sig)
 229 {
 230         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 231         NTSTATUS nt_status;
 232         if (!gensec_ntlmssp_state->session_key.length) {
 233                 DEBUG(3, ("NO session key, cannot seal packet\n"));
 234                 return NT_STATUS_NO_USER_SESSION_KEY;
 235         }
 236
 237         if (!gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
 238                 DEBUG(3, ("NTLMSSP Sealing not negotiated - cannot seal packet!\n"));
 239                 return NT_STATUS_INVALID_PARAMETER;
 240         }
 241
 242         DEBUG(10,("ntlmssp_seal_data: seal\n"));
 243         dump_data_pw("ntlmssp clear data\n", data, length);
 244         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 245                 /* The order of these two operations matters - we must first seal the packet,
 246                    then seal the sequence number - this is becouse the send_seal_hash is not
 247                    constant, but is is rather updated with each iteration */
 248                 nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 249                                                           data, length,
 250                                                           whole_pdu, pdu_length,
 251                                                           NTLMSSP_SEND, sig, False);
 252                 arcfour_crypt_sbox(gensec_ntlmssp_state->v.ntlm2.send_seal_arcfour_state, data, length);
 253                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 254                         arcfour_crypt_sbox(gensec_ntlmssp_state->v.ntlm2.send_seal_arcfour_state, sig->data+4, 8);
 255                 }
 256         } else {
 257                 uint32_t crc;
 258                 crc = crc32_calc_buffer(data, length);
 259                 if (!msrpc_gen(sig_mem_ctx, sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->v.ntlm.seq_num)) {
 260                         return NT_STATUS_NO_MEMORY;
 261                 }
 262
 263                 /* The order of these two operations matters - we must
 264                    first seal the packet, then seal the sequence
 265                    number - this is becouse the ntlmssp_hash is not
 266                    constant, but is is rather updated with each
 267                    iteration */
 268
 269                 arcfour_crypt_sbox(gensec_ntlmssp_state->v.ntlm.arcfour_state, data, length);
 270                 arcfour_crypt_sbox(gensec_ntlmssp_state->v.ntlm.arcfour_state, sig->data+4, sig->length-4);
 271                 /* increment counter on send */
 272                 gensec_ntlmssp_state->v.ntlm.seq_num++;
 273                 nt_status = NT_STATUS_OK;
 274         }
 275         dump_data_pw("ntlmssp signature\n", sig->data, sig->length);
 276         dump_data_pw("ntlmssp sealed data\n", data, length);
 277
 278
 279         return nt_status;
 280 }
 281
 282 /**
 283  * Unseal data with the NTLMSSP algorithm
 284  *
 285  */
 286
 287 /*
 288   wrappers for the ntlmssp_*() functions
 289 */
 290 NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security,
 291                                       TALLOC_CTX *sig_mem_ctx,
 292                                       uint8_t *data, size_t length,
 293                                       const uint8_t *whole_pdu, size_t pdu_length,
 294                                       const DATA_BLOB *sig)
 295 {
 296         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 297         DATA_BLOB local_sig;
 298         NTSTATUS nt_status;
 299         if (!gensec_ntlmssp_state->session_key.length) {
 300                 DEBUG(3, ("NO session key, cannot unseal packet\n"));
 301                 return NT_STATUS_NO_USER_SESSION_KEY;
 302         }
 303
 304         dump_data_pw("ntlmssp sealed data\n", data, length);
 305         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 306                 arcfour_crypt_sbox(gensec_ntlmssp_state->v.ntlm2.recv_seal_arcfour_state, data, length);
 307
 308                 nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 309                                                           data, length,
 310                                                           whole_pdu, pdu_length,
 311                                                           NTLMSSP_RECEIVE, &local_sig, True);
 312                 if (!NT_STATUS_IS_OK(nt_status)) {
 313                         return nt_status;
 314                 }
 315
 316                 if (local_sig.length != sig->length ||
 317                     memcmp(local_sig.data,
 318                            sig->data, sig->length) != 0) {
 319                         DEBUG(5, ("BAD SIG NTLM2: wanted signature of\n"));
 320                         dump_data(5, local_sig.data, local_sig.length);
 321
 322                         DEBUG(5, ("BAD SIG: got signature of\n"));
 323                         dump_data(5, sig->data, sig->length);
 324
 325                         DEBUG(0, ("NTLMSSP NTLM2 packet check failed due to invalid signature!\n"));
 326                         return NT_STATUS_ACCESS_DENIED;
 327                 }
 328
 329                 dump_data_pw("ntlmssp clear data\n", data, length);
 330                 return NT_STATUS_OK;
 331         } else {
 332                 arcfour_crypt_sbox(gensec_ntlmssp_state->v.ntlm.arcfour_state, data, length);
 333                 dump_data_pw("ntlmssp clear data\n", data, length);
 334                 return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx, data, length, whole_pdu, pdu_length, sig);
 335         }
 336 }
 337
 338 /**
 339    Initialise the state for NTLMSSP signing.
 340 */
 341 NTSTATUS ntlmssp_sign_init(struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 342 {
 343         uint8_t p24[24];
 344         ZERO_STRUCT(p24);
 345
 346         DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
 347         debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
 348
 349         if (!gensec_ntlmssp_state->session_key.length) {
 350                 DEBUG(3, ("NO session key, cannot intialise signing\n"));
 351                 return NT_STATUS_NO_USER_SESSION_KEY;
 352         }
 353
 354         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
 355         {
 356                 DATA_BLOB weak_session_key = gensec_ntlmssp_state->session_key;
 357                 const char *send_sign_const;
 358                 const char *send_seal_const;
 359                 const char *recv_sign_const;
 360                 const char *recv_seal_const;
 361
 362                 DATA_BLOB send_seal_key;
 363                 DATA_BLOB recv_seal_key;
 364
 365                 switch (gensec_ntlmssp_state->role) {
 366                 case NTLMSSP_CLIENT:
 367                         send_sign_const = CLI_SIGN;
 368                         send_seal_const = CLI_SEAL;
 369                         recv_sign_const = SRV_SIGN;
 370                         recv_seal_const = SRV_SEAL;
 371                         break;
 372                 case NTLMSSP_SERVER:
 373                         send_sign_const = SRV_SIGN;
 374                         send_seal_const = SRV_SEAL;
 375                         recv_sign_const = CLI_SIGN;
 376                         recv_seal_const = CLI_SEAL;
 377                         break;
 378                 default:
 379                         return NT_STATUS_INTERNAL_ERROR;
 380                 }
 381
 382                 gensec_ntlmssp_state->v.ntlm2.send_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 383                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->v.ntlm2.send_seal_arcfour_state);
 384                 gensec_ntlmssp_state->v.ntlm2.recv_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 385                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->v.ntlm2.send_seal_arcfour_state);
 386
 387                 /**
 388                    Weaken NTLMSSP keys to cope with down-level clients, servers and export restrictions.
 389
 390                    We probably should have some parameters to control this, once we get NTLM2 working.
 391                 */
 392
 393
 394                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
 395
 396                 } else if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 397                         weak_session_key.length = 6;
 398                 } else { /* forty bits */
 399                         weak_session_key.length = 5;
 400                 }
 401                 dump_data_pw("NTLMSSP weakend master key:\n",
 402                              weak_session_key.data,
 403                              weak_session_key.length);
 404
 405                 /* SEND */
 406                 calc_ntlmv2_key(gensec_ntlmssp_state,
 407                                 &gensec_ntlmssp_state->v.ntlm2.send_sign_key,
 408                                 gensec_ntlmssp_state->session_key, send_sign_const);
 409                 dump_data_pw("NTLMSSP send sign key:\n",
 410                              gensec_ntlmssp_state->v.ntlm2.send_sign_key.data,
 411                              gensec_ntlmssp_state->v.ntlm2.send_sign_key.length);
 412
 413                 calc_ntlmv2_key(gensec_ntlmssp_state,
 414                                 &send_seal_key,
 415                                 weak_session_key, send_seal_const);
 416                 dump_data_pw("NTLMSSP send seal key:\n",
 417                              send_seal_key.data,
 418                              send_seal_key.length);
 419
 420                 arcfour_init(gensec_ntlmssp_state->v.ntlm2.send_seal_arcfour_state,
 421                              &send_seal_key);
 422
 423                 dump_data_pw("NTLMSSP send sesl hash:\n",
 424                              gensec_ntlmssp_state->v.ntlm2.send_seal_arcfour_state->sbox,
 425                              sizeof(gensec_ntlmssp_state->v.ntlm2.send_seal_arcfour_state->sbox));
 426
 427                 /* RECV */
 428                 calc_ntlmv2_key(gensec_ntlmssp_state,
 429                                 &gensec_ntlmssp_state->v.ntlm2.recv_sign_key,
 430                                 gensec_ntlmssp_state->session_key, recv_sign_const);
 431                 dump_data_pw("NTLMSSP recv sign key:\n",
 432                              gensec_ntlmssp_state->v.ntlm2.recv_sign_key.data,
 433                              gensec_ntlmssp_state->v.ntlm2.recv_sign_key.length);
 434
 435                 calc_ntlmv2_key(gensec_ntlmssp_state,
 436                                 &recv_seal_key,
 437                                 weak_session_key, recv_seal_const);
 438                 dump_data_pw("NTLMSSP recv seal key:\n",
 439                              recv_seal_key.data,
 440                              recv_seal_key.length);
 441                 arcfour_init(gensec_ntlmssp_state->v.ntlm2.recv_seal_arcfour_state,
 442                              &recv_seal_key);
 443
 444                 dump_data_pw("NTLMSSP receive seal hash:\n",
 445                              gensec_ntlmssp_state->v.ntlm2.recv_seal_arcfour_state->sbox,
 446                              sizeof(gensec_ntlmssp_state->v.ntlm2.recv_seal_arcfour_state->sbox));
 447
 448                 gensec_ntlmssp_state->v.ntlm2.send_seq_num = 0;
 449                 gensec_ntlmssp_state->v.ntlm2.recv_seq_num = 0;
 450
 451         } else {
 452                 DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
 453
 454                 gensec_ntlmssp_state->v.ntlm.arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 455                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->v.ntlm.arcfour_state);
 456
 457                 arcfour_init(gensec_ntlmssp_state->v.ntlm.arcfour_state,
 458                              &gensec_ntlmssp_state->session_key);
 459                 dump_data_pw("NTLMSSP hash:\n", gensec_ntlmssp_state->v.ntlm.arcfour_state->sbox,
 460                              sizeof(gensec_ntlmssp_state->v.ntlm.arcfour_state->sbox));
 461
 462                 gensec_ntlmssp_state->v.ntlm.seq_num = 0;
 463         }
 464
 465         return NT_STATUS_OK;
 466 }
 467
 468 size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security)
 469 {
 470         return NTLMSSP_SIG_SIZE;
 471 }
 472
 473 NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security,
 474                              TALLOC_CTX *sig_mem_ctx,
 475                              const DATA_BLOB *in,
 476                              DATA_BLOB *out)
 477 {
 478         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 479         DATA_BLOB sig;
 480         NTSTATUS nt_status;
 481
 482         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
 483
 484                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 485                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 486
 487                 nt_status = gensec_ntlmssp_seal_packet(gensec_security, sig_mem_ctx,
 488                                                        out->data + NTLMSSP_SIG_SIZE,
 489                                                        out->length - NTLMSSP_SIG_SIZE,
 490                                                        out->data + NTLMSSP_SIG_SIZE,
 491                                                        out->length - NTLMSSP_SIG_SIZE,
 492                                                        &sig);
 493
 494                 if (NT_STATUS_IS_OK(nt_status)) {
 495                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 496                 }
 497                 return nt_status;
 498
 499         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN)
 500                    || (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
 501
 502                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 503                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 504
 505                 nt_status = gensec_ntlmssp_sign_packet(gensec_security, sig_mem_ctx,
 506                                                 out->data + NTLMSSP_SIG_SIZE,
 507                                                 out->length - NTLMSSP_SIG_SIZE,
 508                                                 out->data + NTLMSSP_SIG_SIZE,
 509                                                 out->length - NTLMSSP_SIG_SIZE,
 510                                                 &sig);
 511
 512                 if (NT_STATUS_IS_OK(nt_status)) {
 513                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 514                 }
 515                 return nt_status;
 516
 517         } else {
 518                 *out = *in;
 519                 return NT_STATUS_OK;
 520         }
 521 }
 522
 523
 524 NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security,
 525                                TALLOC_CTX *sig_mem_ctx,
 526                                const DATA_BLOB *in,
 527                                DATA_BLOB *out)
 528 {
 529         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 530         DATA_BLOB sig;
 531
 532         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
 533                 if (in->length < NTLMSSP_SIG_SIZE) {
 534                         return NT_STATUS_INVALID_PARAMETER;
 535                 }
 536                 sig.data = in->data;
 537                 sig.length = NTLMSSP_SIG_SIZE;
 538
 539                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 540
 541                 return gensec_ntlmssp_unseal_packet(gensec_security, sig_mem_ctx,
 542                                                     out->data, out->length,
 543                                                     out->data, out->length,
 544                                                     &sig);
 545
 546         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN)
 547                    || (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
 548                 if (in->length < NTLMSSP_SIG_SIZE) {
 549                         return NT_STATUS_INVALID_PARAMETER;
 550                 }
 551                 sig.data = in->data;
 552                 sig.length = NTLMSSP_SIG_SIZE;
 553
 554                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 555
 556                 return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx,
 557                                             out->data, out->length,
 558                                             out->data, out->length,
 559                                             &sig);
 560         } else {
 561                 *out = *in;
 562                 return NT_STATUS_OK;
 563         }
 564 }
 565