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 "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->crypt.ntlm2.send_seq_num);
  82                         gensec_ntlmssp_state->crypt.ntlm2.send_seq_num++;
  83                         hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
  84                                                  gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length, &ctx);
  85                         break;
  86                 case NTLMSSP_RECEIVE:
  87                         SIVAL(seq_num, 0, gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num);
  88                         gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num++;
  89                         hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
  90                                                  gensec_ntlmssp_state->crypt.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->crypt.ntlm2.send_seal_arcfour_state, digest, 8);
 101                                 break;
 102                         case NTLMSSP_RECEIVE:
 103                                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.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->crypt.ntlm.seq_num)) {
 116                         return NT_STATUS_NO_MEMORY;
 117                 }
 118                 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
 119
 120                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.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_security->want_features & GENSEC_FEATURE_SIGN)) {
 140                 DEBUG(3, ("GENSEC Signing not requested - cannot seal packet!\n"));
 141                 return NT_STATUS_INVALID_PARAMETER;
 142         }
 143
 144         if (!gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
 145                 DEBUG(3, ("NTLMSSP Signing not negotiated - cannot sign packet!\n"));
 146                 return NT_STATUS_INVALID_PARAMETER;
 147         }
 148
 149         return ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 150                                              data, length,
 151                                              whole_pdu, pdu_length,
 152                                              NTLMSSP_SEND, sig, True);
 153 }
 154
 155 /**
 156  * Check the signature of an incoming packet
 157  *
 158  */
 159
 160 NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security,
 161                                      TALLOC_CTX *sig_mem_ctx,
 162                                      const uint8_t *data, size_t length,
 163                                      const uint8_t *whole_pdu, size_t pdu_length,
 164                                      const DATA_BLOB *sig)
 165 {
 166         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 167
 168         DATA_BLOB local_sig;
 169         NTSTATUS nt_status;
 170
 171         if (!gensec_ntlmssp_state->session_key.length) {
 172                 DEBUG(3, ("NO session key, cannot check packet signature\n"));
 173                 return NT_STATUS_NO_USER_SESSION_KEY;
 174         }
 175
 176         if (!(gensec_security->want_features & (GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SIGN))) {
 177                 DEBUG(3, ("GENSEC Signing/Sealing not requested - cannot check packet!\n"));
 178                 return NT_STATUS_INVALID_PARAMETER;
 179         }
 180
 181         if (sig->length < 8) {
 182                 DEBUG(0, ("NTLMSSP packet check failed due to short signature (%lu bytes)!\n",
 183                           (unsigned long)sig->length));
 184         }
 185
 186         nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 187                                                   data, length,
 188                                                   whole_pdu, pdu_length,
 189                                                   NTLMSSP_RECEIVE, &local_sig, True);
 190
 191         if (!NT_STATUS_IS_OK(nt_status)) {
 192                 DEBUG(0, ("NTLMSSP packet check failed with %s\n", nt_errstr(nt_status)));
 193                 return nt_status;
 194         }
 195
 196         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 197                 if (local_sig.length != sig->length ||
 198                     memcmp(local_sig.data,
 199                            sig->data, sig->length) != 0) {
 200                         DEBUG(5, ("BAD SIG NTLM2: wanted signature of\n"));
 201                         dump_data(5, local_sig.data, local_sig.length);
 202
 203                         DEBUG(5, ("BAD SIG: got signature of\n"));
 204                         dump_data(5, sig->data, sig->length);
 205
 206                         DEBUG(0, ("NTLMSSP NTLM2 packet check failed due to invalid signature!\n"));
 207                         return NT_STATUS_ACCESS_DENIED;
 208                 }
 209         } else {
 210                 if (local_sig.length != sig->length ||
 211                     memcmp(local_sig.data + 8,
 212                            sig->data + 8, sig->length - 8) != 0) {
 213                         DEBUG(5, ("BAD SIG NTLM1: wanted signature of\n"));
 214                         dump_data(5, local_sig.data, local_sig.length);
 215
 216                         DEBUG(5, ("BAD SIG: got signature of\n"));
 217                         dump_data(5, sig->data, sig->length);
 218
 219                         DEBUG(0, ("NTLMSSP NTLM1 packet check failed due to invalid signature!\n"));
 220                         return NT_STATUS_ACCESS_DENIED;
 221                 }
 222         }
 223         dump_data_pw("checked ntlmssp signature\n", sig->data, sig->length);
 224
 225         return NT_STATUS_OK;
 226 }
 227
 228
 229 /**
 230  * Seal data with the NTLMSSP algorithm
 231  *
 232  */
 233
 234 NTSTATUS gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security,
 235                                     TALLOC_CTX *sig_mem_ctx,
 236                                     uint8_t *data, size_t length,
 237                                     const uint8_t *whole_pdu, size_t pdu_length,
 238                                     DATA_BLOB *sig)
 239 {
 240         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 241         NTSTATUS nt_status;
 242         if (!gensec_ntlmssp_state->session_key.length) {
 243                 DEBUG(3, ("NO session key, cannot seal packet\n"));
 244                 return NT_STATUS_NO_USER_SESSION_KEY;
 245         }
 246
 247         if (!(gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 248                 DEBUG(3, ("GENSEC Sealing not requested - cannot seal packet!\n"));
 249                 return NT_STATUS_INVALID_PARAMETER;
 250         }
 251
 252         if (!gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
 253                 DEBUG(3, ("NTLMSSP Sealing not negotiated - cannot seal packet!\n"));
 254                 return NT_STATUS_INVALID_PARAMETER;
 255         }
 256
 257
 258         DEBUG(10,("ntlmssp_seal_data: seal\n"));
 259         dump_data_pw("ntlmssp clear data\n", data, length);
 260         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 261                 /* The order of these two operations matters - we must first seal the packet,
 262                    then seal the sequence number - this is becouse the send_seal_hash is not
 263                    constant, but is is rather updated with each iteration */
 264                 nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 265                                                           data, length,
 266                                                           whole_pdu, pdu_length,
 267                                                           NTLMSSP_SEND, sig, False);
 268                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, data, length);
 269                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 270                         arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, sig->data+4, 8);
 271                 }
 272         } else {
 273                 uint32_t crc;
 274                 crc = crc32_calc_buffer(data, length);
 275                 if (!msrpc_gen(sig_mem_ctx, sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
 276                         return NT_STATUS_NO_MEMORY;
 277                 }
 278
 279                 /* The order of these two operations matters - we must
 280                    first seal the packet, then seal the sequence
 281                    number - this is becouse the ntlmssp_hash is not
 282                    constant, but is is rather updated with each
 283                    iteration */
 284
 285                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
 286                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
 287                 /* increment counter on send */
 288                 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
 289                 nt_status = NT_STATUS_OK;
 290         }
 291         dump_data_pw("ntlmssp signature\n", sig->data, sig->length);
 292         dump_data_pw("ntlmssp sealed data\n", data, length);
 293
 294
 295         return nt_status;
 296 }
 297
 298 /**
 299  * Unseal data with the NTLMSSP algorithm
 300  *
 301  */
 302
 303 /*
 304   wrappers for the ntlmssp_*() functions
 305 */
 306 NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security,
 307                                       TALLOC_CTX *sig_mem_ctx,
 308                                       uint8_t *data, size_t length,
 309                                       const uint8_t *whole_pdu, size_t pdu_length,
 310                                       const DATA_BLOB *sig)
 311 {
 312         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 313         DATA_BLOB local_sig;
 314         NTSTATUS nt_status;
 315         if (!gensec_ntlmssp_state->session_key.length) {
 316                 DEBUG(3, ("NO session key, cannot unseal packet\n"));
 317                 return NT_STATUS_NO_USER_SESSION_KEY;
 318         }
 319
 320         if (!(gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 321                 DEBUG(3, ("GENSEC Sealing not requested - cannot unseal packet!\n"));
 322                 return NT_STATUS_INVALID_PARAMETER;
 323         }
 324
 325         dump_data_pw("ntlmssp sealed data\n", data, length);
 326         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 327                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, data, length);
 328
 329                 nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 330                                                           data, length,
 331                                                           whole_pdu, pdu_length,
 332                                                           NTLMSSP_RECEIVE, &local_sig, True);
 333                 if (!NT_STATUS_IS_OK(nt_status)) {
 334                         return nt_status;
 335                 }
 336
 337                 if (local_sig.length != sig->length ||
 338                     memcmp(local_sig.data,
 339                            sig->data, sig->length) != 0) {
 340                         DEBUG(5, ("BAD SIG NTLM2: wanted signature of\n"));
 341                         dump_data(5, local_sig.data, local_sig.length);
 342
 343                         DEBUG(5, ("BAD SIG: got signature of\n"));
 344                         dump_data(5, sig->data, sig->length);
 345
 346                         DEBUG(0, ("NTLMSSP NTLM2 packet check failed due to invalid signature!\n"));
 347                         return NT_STATUS_ACCESS_DENIED;
 348                 }
 349
 350                 dump_data_pw("ntlmssp clear data\n", data, length);
 351                 return NT_STATUS_OK;
 352         } else {
 353                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
 354                 dump_data_pw("ntlmssp clear data\n", data, length);
 355                 return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx, data, length, whole_pdu, pdu_length, sig);
 356         }
 357 }
 358
 359 /**
 360    Initialise the state for NTLMSSP signing.
 361 */
 362 NTSTATUS ntlmssp_sign_init(struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 363 {
 364         uint8_t p24[24];
 365         ZERO_STRUCT(p24);
 366
 367         DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
 368         debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
 369
 370         if (!gensec_ntlmssp_state->session_key.length) {
 371                 DEBUG(3, ("NO session key, cannot intialise signing\n"));
 372                 return NT_STATUS_NO_USER_SESSION_KEY;
 373         }
 374
 375         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
 376         {
 377                 DATA_BLOB weak_session_key = gensec_ntlmssp_state->session_key;
 378                 const char *send_sign_const;
 379                 const char *send_seal_const;
 380                 const char *recv_sign_const;
 381                 const char *recv_seal_const;
 382
 383                 DATA_BLOB send_seal_key;
 384                 DATA_BLOB recv_seal_key;
 385
 386                 switch (gensec_ntlmssp_state->role) {
 387                 case NTLMSSP_CLIENT:
 388                         send_sign_const = CLI_SIGN;
 389                         send_seal_const = CLI_SEAL;
 390                         recv_sign_const = SRV_SIGN;
 391                         recv_seal_const = SRV_SEAL;
 392                         break;
 393                 case NTLMSSP_SERVER:
 394                         send_sign_const = SRV_SIGN;
 395                         send_seal_const = SRV_SEAL;
 396                         recv_sign_const = CLI_SIGN;
 397                         recv_seal_const = CLI_SEAL;
 398                         break;
 399                 default:
 400                         return NT_STATUS_INTERNAL_ERROR;
 401                 }
 402
 403                 gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 404                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
 405                 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 406                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
 407
 408                 /**
 409                    Weaken NTLMSSP keys to cope with down-level clients, servers and export restrictions.
 410
 411                    We probably should have some parameters to control this, once we get NTLM2 working.
 412                 */
 413
 414
 415                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
 416
 417                 } else if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 418                         weak_session_key.length = 6;
 419                 } else { /* forty bits */
 420                         weak_session_key.length = 5;
 421                 }
 422                 dump_data_pw("NTLMSSP weakend master key:\n",
 423                              weak_session_key.data,
 424                              weak_session_key.length);
 425
 426                 /* SEND */
 427                 calc_ntlmv2_key(gensec_ntlmssp_state,
 428                                 &gensec_ntlmssp_state->crypt.ntlm2.send_sign_key,
 429                                 gensec_ntlmssp_state->session_key, send_sign_const);
 430                 dump_data_pw("NTLMSSP send sign key:\n",
 431                              gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
 432                              gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length);
 433
 434                 calc_ntlmv2_key(gensec_ntlmssp_state,
 435                                 &send_seal_key,
 436                                 weak_session_key, send_seal_const);
 437                 dump_data_pw("NTLMSSP send seal key:\n",
 438                              send_seal_key.data,
 439                              send_seal_key.length);
 440
 441                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state,
 442                              &send_seal_key);
 443
 444                 dump_data_pw("NTLMSSP send sesl hash:\n",
 445                              gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox,
 446                              sizeof(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox));
 447
 448                 /* RECV */
 449                 calc_ntlmv2_key(gensec_ntlmssp_state,
 450                                 &gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key,
 451                                 gensec_ntlmssp_state->session_key, recv_sign_const);
 452                 dump_data_pw("NTLMSSP recv sign key:\n",
 453                              gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
 454                              gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length);
 455
 456                 calc_ntlmv2_key(gensec_ntlmssp_state,
 457                                 &recv_seal_key,
 458                                 weak_session_key, recv_seal_const);
 459                 dump_data_pw("NTLMSSP recv seal key:\n",
 460                              recv_seal_key.data,
 461                              recv_seal_key.length);
 462                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state,
 463                              &recv_seal_key);
 464
 465                 dump_data_pw("NTLMSSP receive seal hash:\n",
 466                              gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox,
 467                              sizeof(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox));
 468
 469                 gensec_ntlmssp_state->crypt.ntlm2.send_seq_num = 0;
 470                 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = 0;
 471
 472         } else {
 473                 DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
 474
 475                 gensec_ntlmssp_state->crypt.ntlm.arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 476                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm.arcfour_state);
 477
 478                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm.arcfour_state,
 479                              &gensec_ntlmssp_state->session_key);
 480                 dump_data_pw("NTLMSSP hash:\n", gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox,
 481                              sizeof(gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox));
 482
 483                 gensec_ntlmssp_state->crypt.ntlm.seq_num = 0;
 484         }
 485
 486         return NT_STATUS_OK;
 487 }
 488
 489 size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security)
 490 {
 491         return NTLMSSP_SIG_SIZE;
 492 }
 493
 494 NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security,
 495                              TALLOC_CTX *sig_mem_ctx,
 496                              const DATA_BLOB *in,
 497                              DATA_BLOB *out)
 498 {
 499         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 500         DATA_BLOB sig;
 501         NTSTATUS nt_status;
 502
 503         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
 504
 505                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 506                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 507
 508                 nt_status = gensec_ntlmssp_seal_packet(gensec_security, sig_mem_ctx,
 509                                                        out->data + NTLMSSP_SIG_SIZE,
 510                                                        out->length - NTLMSSP_SIG_SIZE,
 511                                                        out->data + NTLMSSP_SIG_SIZE,
 512                                                        out->length - NTLMSSP_SIG_SIZE,
 513                                                        &sig);
 514
 515                 if (NT_STATUS_IS_OK(nt_status)) {
 516                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 517                 }
 518                 return nt_status;
 519
 520         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN)
 521                    || (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
 522
 523                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 524                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 525
 526                 nt_status = gensec_ntlmssp_sign_packet(gensec_security, sig_mem_ctx,
 527                                                 out->data + NTLMSSP_SIG_SIZE,
 528                                                 out->length - NTLMSSP_SIG_SIZE,
 529                                                 out->data + NTLMSSP_SIG_SIZE,
 530                                                 out->length - NTLMSSP_SIG_SIZE,
 531                                                 &sig);
 532
 533                 if (NT_STATUS_IS_OK(nt_status)) {
 534                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 535                 }
 536                 return nt_status;
 537
 538         } else {
 539                 *out = *in;
 540                 return NT_STATUS_OK;
 541         }
 542 }
 543
 544
 545 NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security,
 546                                TALLOC_CTX *sig_mem_ctx,
 547                                const DATA_BLOB *in,
 548                                DATA_BLOB *out)
 549 {
 550         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 551         DATA_BLOB sig;
 552
 553         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
 554                 if (in->length < NTLMSSP_SIG_SIZE) {
 555                         return NT_STATUS_INVALID_PARAMETER;
 556                 }
 557                 sig.data = in->data;
 558                 sig.length = NTLMSSP_SIG_SIZE;
 559
 560                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 561
 562                 return gensec_ntlmssp_unseal_packet(gensec_security, sig_mem_ctx,
 563                                                     out->data, out->length,
 564                                                     out->data, out->length,
 565                                                     &sig);
 566
 567         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN)
 568                    || (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
 569                 if (in->length < NTLMSSP_SIG_SIZE) {
 570                         return NT_STATUS_INVALID_PARAMETER;
 571                 }
 572                 sig.data = in->data;
 573                 sig.length = NTLMSSP_SIG_SIZE;
 574
 575                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 576
 577                 return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx,
 578                                             out->data, out->length,
 579                                             out->data, out->length,
 580                                             &sig);
 581         } else {
 582                 *out = *in;
 583                 return NT_STATUS_OK;
 584         }
 585 }
 586