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 #include "auth/credentials/credentials.h"
  29 #include "auth/gensec/gensec.h"
  30
  31 #define CLI_SIGN "session key to client-to-server signing key magic constant"
  32 #define CLI_SEAL "session key to client-to-server sealing key magic constant"
  33 #define SRV_SIGN "session key to server-to-client signing key magic constant"
  34 #define SRV_SEAL "session key to server-to-client sealing key magic constant"
  35
  36 /**
  37  * Some notes on the NTLM2 code:
  38  *
  39  * NTLM2 is a AEAD system.  This means that the data encrypted is not
  40  * all the data that is signed.  In DCE-RPC case, the headers of the
  41  * DCE-RPC packets are also signed.  This prevents some of the
  42  * fun-and-games one might have by changing them.
  43  *
  44  */
  45
  46 static void calc_ntlmv2_key(TALLOC_CTX *mem_ctx,
  47                             DATA_BLOB *subkey,
  48                             DATA_BLOB session_key,
  49                             const char *constant)
  50 {
  51         struct MD5Context ctx3;
  52         *subkey = data_blob_talloc(mem_ctx, NULL, 16);
  53         MD5Init(&ctx3);
  54         MD5Update(&ctx3, session_key.data, session_key.length);
  55         MD5Update(&ctx3, (const uint8_t *)constant, strlen(constant)+1);
  56         MD5Final(subkey->data, &ctx3);
  57 }
  58
  59 enum ntlmssp_direction {
  60         NTLMSSP_SEND,
  61         NTLMSSP_RECEIVE
  62 };
  63
  64 static NTSTATUS ntlmssp_make_packet_signature(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  65                                               TALLOC_CTX *sig_mem_ctx,
  66                                               const uint8_t *data, size_t length,
  67                                               const uint8_t *whole_pdu, size_t pdu_length,
  68                                               enum ntlmssp_direction direction,
  69                                               DATA_BLOB *sig, BOOL encrypt_sig)
  70 {
  71         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
  72
  73                 HMACMD5Context ctx;
  74                 uint8_t digest[16];
  75                 uint8_t seq_num[4];
  76
  77                 *sig = data_blob_talloc(sig_mem_ctx, NULL, NTLMSSP_SIG_SIZE);
  78                 if (!sig->data) {
  79                         return NT_STATUS_NO_MEMORY;
  80                 }
  81
  82                 switch (direction) {
  83                 case NTLMSSP_SEND:
  84                         SIVAL(seq_num, 0, gensec_ntlmssp_state->crypt.ntlm2.send_seq_num);
  85                         gensec_ntlmssp_state->crypt.ntlm2.send_seq_num++;
  86                         hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
  87                                                  gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length, &ctx);
  88                         break;
  89                 case NTLMSSP_RECEIVE:
  90                         SIVAL(seq_num, 0, gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num);
  91                         gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num++;
  92                         hmac_md5_init_limK_to_64(gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
  93                                                  gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length, &ctx);
  94                         break;
  95                 }
  96                 hmac_md5_update(seq_num, sizeof(seq_num), &ctx);
  97                 hmac_md5_update(whole_pdu, pdu_length, &ctx);
  98                 hmac_md5_final(digest, &ctx);
  99
 100                 if (encrypt_sig && gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 101                         switch (direction) {
 102                         case NTLMSSP_SEND:
 103                                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, digest, 8);
 104                                 break;
 105                         case NTLMSSP_RECEIVE:
 106                                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, digest, 8);
 107                                 break;
 108                         }
 109                 }
 110
 111                 SIVAL(sig->data, 0, NTLMSSP_SIGN_VERSION);
 112                 memcpy(sig->data + 4, digest, 8);
 113                 memcpy(sig->data + 12, seq_num, 4);
 114
 115                 DEBUG(10, ("NTLM2: created signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
 116                 dump_data(11, sig->data, sig->length);
 117
 118         } else {
 119                 uint32_t crc;
 120                 crc = crc32_calc_buffer(data, length);
 121                 if (!msrpc_gen(sig_mem_ctx, sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
 122                         return NT_STATUS_NO_MEMORY;
 123                 }
 124                 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
 125
 126                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
 127
 128                 DEBUG(10, ("NTLM1: created signature over %llu bytes of input:\n", (unsigned long long)length));
 129                 dump_data(11, sig->data, sig->length);
 130         }
 131         return NT_STATUS_OK;
 132 }
 133
 134 /* TODO: make this non-public */
 135 _PUBLIC_ NTSTATUS gensec_ntlmssp_sign_packet(struct gensec_security *gensec_security,
 136                                     TALLOC_CTX *sig_mem_ctx,
 137                                     const uint8_t *data, size_t length,
 138                                     const uint8_t *whole_pdu, size_t pdu_length,
 139                                     DATA_BLOB *sig)
 140 {
 141         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 142
 143         return ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 144                                              data, length,
 145                                              whole_pdu, pdu_length,
 146                                              NTLMSSP_SEND, sig, True);
 147 }
 148
 149 /**
 150  * Check the signature of an incoming packet
 151  *
 152  */
 153
 154 NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security,
 155                                      TALLOC_CTX *sig_mem_ctx,
 156                                      const uint8_t *data, size_t length,
 157                                      const uint8_t *whole_pdu, size_t pdu_length,
 158                                      const DATA_BLOB *sig)
 159 {
 160         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 161
 162         DATA_BLOB local_sig;
 163         NTSTATUS nt_status;
 164
 165         if (!gensec_ntlmssp_state->session_key.length) {
 166                 DEBUG(3, ("NO session key, cannot check packet signature\n"));
 167                 return NT_STATUS_NO_USER_SESSION_KEY;
 168         }
 169
 170         if (sig->length < 8) {
 171                 DEBUG(1, ("NTLMSSP packet check failed due to short signature (%lu bytes)!\n",
 172                           (unsigned long)sig->length));
 173         }
 174
 175         nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 176                                                   data, length,
 177                                                   whole_pdu, pdu_length,
 178                                                   NTLMSSP_RECEIVE, &local_sig, True);
 179
 180         if (!NT_STATUS_IS_OK(nt_status)) {
 181                 DEBUG(0, ("NTLMSSP packet check failed with %s\n", nt_errstr(nt_status)));
 182                 return nt_status;
 183         }
 184
 185         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 186                 if (local_sig.length != sig->length ||
 187                     memcmp(local_sig.data,
 188                            sig->data, sig->length) != 0) {
 189                         DEBUG(5, ("BAD SIG NTLM2: wanted signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
 190                         dump_data(5, local_sig.data, local_sig.length);
 191
 192                         DEBUG(5, ("BAD SIG: got signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
 193                         dump_data(5, sig->data, sig->length);
 194
 195                         DEBUG(1, ("NTLMSSP NTLM2 packet check failed due to invalid signature on %llu bytes of input!\n", (unsigned long long)pdu_length));
 196                         return NT_STATUS_ACCESS_DENIED;
 197                 }
 198         } else {
 199                 if (local_sig.length != sig->length ||
 200                     memcmp(local_sig.data + 8,
 201                            sig->data + 8, sig->length - 8) != 0) {
 202                         DEBUG(5, ("BAD SIG NTLM1: wanted signature of %llu bytes of input:\n", (unsigned long long)length));
 203                         dump_data(5, local_sig.data, local_sig.length);
 204
 205                         DEBUG(5, ("BAD SIG: got signature of %llu bytes of input:\n", (unsigned long long)length));
 206                         dump_data(5, sig->data, sig->length);
 207
 208                         DEBUG(1, ("NTLMSSP NTLM1 packet check failed due to invalid signature on %llu bytes of input:\n", (unsigned long long)length));
 209                         return NT_STATUS_ACCESS_DENIED;
 210                 }
 211         }
 212         dump_data_pw("checked ntlmssp signature\n", sig->data, sig->length);
 213
 214         return NT_STATUS_OK;
 215 }
 216
 217
 218 /**
 219  * Seal data with the NTLMSSP algorithm
 220  *
 221  */
 222
 223 NTSTATUS gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security,
 224                                     TALLOC_CTX *sig_mem_ctx,
 225                                     uint8_t *data, size_t length,
 226                                     const uint8_t *whole_pdu, size_t pdu_length,
 227                                     DATA_BLOB *sig)
 228 {
 229         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 230         NTSTATUS nt_status;
 231         if (!gensec_ntlmssp_state->session_key.length) {
 232                 DEBUG(3, ("NO session key, cannot seal packet\n"));
 233                 return NT_STATUS_NO_USER_SESSION_KEY;
 234         }
 235
 236         DEBUG(10,("ntlmssp_seal_data: seal\n"));
 237         dump_data_pw("ntlmssp clear data\n", data, length);
 238         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 239                 /* The order of these two operations matters - we must first seal the packet,
 240                    then seal the sequence number - this is becouse the send_seal_hash is not
 241                    constant, but is is rather updated with each iteration */
 242                 nt_status = ntlmssp_make_packet_signature(gensec_ntlmssp_state, sig_mem_ctx,
 243                                                           data, length,
 244                                                           whole_pdu, pdu_length,
 245                                                           NTLMSSP_SEND, sig, False);
 246                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, data, length);
 247                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 248                         arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, sig->data+4, 8);
 249                 }
 250         } else {
 251                 uint32_t crc;
 252                 crc = crc32_calc_buffer(data, length);
 253                 if (!msrpc_gen(sig_mem_ctx, sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
 254                         return NT_STATUS_NO_MEMORY;
 255                 }
 256
 257                 /* The order of these two operations matters - we must
 258                    first seal the packet, then seal the sequence
 259                    number - this is becouse the ntlmssp_hash is not
 260                    constant, but is is rather updated with each
 261                    iteration */
 262
 263                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
 264                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
 265                 /* increment counter on send */
 266                 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
 267                 nt_status = NT_STATUS_OK;
 268         }
 269         dump_data_pw("ntlmssp signature\n", sig->data, sig->length);
 270         dump_data_pw("ntlmssp sealed data\n", data, length);
 271
 272
 273         return nt_status;
 274 }
 275
 276 /**
 277  * Unseal data with the NTLMSSP algorithm
 278  *
 279  */
 280
 281 /*
 282   wrappers for the ntlmssp_*() functions
 283 */
 284 NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security,
 285                                       TALLOC_CTX *sig_mem_ctx,
 286                                       uint8_t *data, size_t length,
 287                                       const uint8_t *whole_pdu, size_t pdu_length,
 288                                       const DATA_BLOB *sig)
 289 {
 290         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 291         if (!gensec_ntlmssp_state->session_key.length) {
 292                 DEBUG(3, ("NO session key, cannot unseal packet\n"));
 293                 return NT_STATUS_NO_USER_SESSION_KEY;
 294         }
 295
 296         dump_data_pw("ntlmssp sealed data\n", data, length);
 297         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 298                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, data, length);
 299         } else {
 300                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
 301         }
 302         dump_data_pw("ntlmssp clear data\n", data, length);
 303         return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx, data, length, whole_pdu, pdu_length, sig);
 304 }
 305
 306 /**
 307    Initialise the state for NTLMSSP signing.
 308 */
 309 /* TODO: make this non-public */
 310 _PUBLIC_ NTSTATUS ntlmssp_sign_init(struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 311 {
 312         TALLOC_CTX *mem_ctx = talloc_new(gensec_ntlmssp_state);
 313
 314         if (!mem_ctx) {
 315                 return NT_STATUS_NO_MEMORY;
 316         }
 317
 318         DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
 319         debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
 320
 321         if (gensec_ntlmssp_state->session_key.length < 8) {
 322                 talloc_free(mem_ctx);
 323                 DEBUG(3, ("NO session key, cannot intialise signing\n"));
 324                 return NT_STATUS_NO_USER_SESSION_KEY;
 325         }
 326
 327         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
 328         {
 329                 DATA_BLOB weak_session_key = gensec_ntlmssp_state->session_key;
 330                 const char *send_sign_const;
 331                 const char *send_seal_const;
 332                 const char *recv_sign_const;
 333                 const char *recv_seal_const;
 334
 335                 DATA_BLOB send_seal_key;
 336                 DATA_BLOB recv_seal_key;
 337
 338                 switch (gensec_ntlmssp_state->role) {
 339                 case NTLMSSP_CLIENT:
 340                         send_sign_const = CLI_SIGN;
 341                         send_seal_const = CLI_SEAL;
 342                         recv_sign_const = SRV_SIGN;
 343                         recv_seal_const = SRV_SEAL;
 344                         break;
 345                 case NTLMSSP_SERVER:
 346                         send_sign_const = SRV_SIGN;
 347                         send_seal_const = SRV_SEAL;
 348                         recv_sign_const = CLI_SIGN;
 349                         recv_seal_const = CLI_SEAL;
 350                         break;
 351                 default:
 352                         talloc_free(mem_ctx);
 353                         return NT_STATUS_INTERNAL_ERROR;
 354                 }
 355
 356                 gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 357                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
 358                 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 359                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
 360
 361                 /**
 362                    Weaken NTLMSSP keys to cope with down-level
 363                    clients, servers and export restrictions.
 364
 365                    We probably should have some parameters to control
 366                    this, once we get NTLM2 working.
 367                 */
 368
 369                 /* Key weakening was not performed on the master key
 370                  * for NTLM2 (in ntlmssp_weaken_keys()), but must be
 371                  * done on the encryption subkeys only.  That is why
 372                  * we don't have this code for the ntlmv1 case.
 373                  */
 374
 375                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
 376
 377                 } else if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 378                         weak_session_key.length = 7;
 379                 } else { /* forty bits */
 380                         weak_session_key.length = 5;
 381                 }
 382                 dump_data_pw("NTLMSSP weakend master key:\n",
 383                              weak_session_key.data,
 384                              weak_session_key.length);
 385
 386                 /* SEND: sign key */
 387                 calc_ntlmv2_key(gensec_ntlmssp_state,
 388                                 &gensec_ntlmssp_state->crypt.ntlm2.send_sign_key,
 389                                 gensec_ntlmssp_state->session_key, send_sign_const);
 390                 dump_data_pw("NTLMSSP send sign key:\n",
 391                              gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
 392                              gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length);
 393
 394                 /* SEND: seal ARCFOUR pad */
 395                 calc_ntlmv2_key(mem_ctx,
 396                                 &send_seal_key,
 397                                 weak_session_key, send_seal_const);
 398                 dump_data_pw("NTLMSSP send seal key:\n",
 399                              send_seal_key.data,
 400                              send_seal_key.length);
 401                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state,
 402                              &send_seal_key);
 403                 dump_data_pw("NTLMSSP send sesl hash:\n",
 404                              gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox,
 405                              sizeof(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox));
 406
 407                 /* RECV: sign key */
 408                 calc_ntlmv2_key(gensec_ntlmssp_state,
 409                                 &gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key,
 410                                 gensec_ntlmssp_state->session_key, recv_sign_const);
 411                 dump_data_pw("NTLMSSP recv sign key:\n",
 412                              gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
 413                              gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length);
 414
 415                 /* RECV: seal ARCFOUR pad */
 416                 calc_ntlmv2_key(mem_ctx,
 417                                 &recv_seal_key,
 418                                 weak_session_key, recv_seal_const);
 419                 dump_data_pw("NTLMSSP recv seal key:\n",
 420                              recv_seal_key.data,
 421                              recv_seal_key.length);
 422                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state,
 423                              &recv_seal_key);
 424                 dump_data_pw("NTLMSSP receive seal hash:\n",
 425                              gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox,
 426                              sizeof(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox));
 427
 428                 gensec_ntlmssp_state->crypt.ntlm2.send_seq_num = 0;
 429                 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = 0;
 430
 431         } else {
 432                 DATA_BLOB weak_session_key = ntlmssp_weakend_key(gensec_ntlmssp_state, mem_ctx);
 433                 DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
 434
 435                 gensec_ntlmssp_state->crypt.ntlm.arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 436                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm.arcfour_state);
 437
 438                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm.arcfour_state,
 439                              &weak_session_key);
 440                 dump_data_pw("NTLMSSP hash:\n", gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox,
 441                              sizeof(gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox));
 442
 443                 gensec_ntlmssp_state->crypt.ntlm.seq_num = 0;
 444         }
 445
 446         talloc_free(mem_ctx);
 447         return NT_STATUS_OK;
 448 }
 449
 450 size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security, size_t data_size)
 451 {
 452         return NTLMSSP_SIG_SIZE;
 453 }
 454
 455 NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security,
 456                              TALLOC_CTX *sig_mem_ctx,
 457                              const DATA_BLOB *in,
 458                              DATA_BLOB *out)
 459 {
 460         DATA_BLOB sig;
 461         NTSTATUS nt_status;
 462
 463         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 464
 465                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 466                 if (!out->data) {
 467                         return NT_STATUS_NO_MEMORY;
 468                 }
 469                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 470
 471                 nt_status = gensec_ntlmssp_seal_packet(gensec_security, sig_mem_ctx,
 472                                                        out->data + NTLMSSP_SIG_SIZE,
 473                                                        out->length - NTLMSSP_SIG_SIZE,
 474                                                        out->data + NTLMSSP_SIG_SIZE,
 475                                                        out->length - NTLMSSP_SIG_SIZE,
 476                                                        &sig);
 477
 478                 if (NT_STATUS_IS_OK(nt_status)) {
 479                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 480                 }
 481                 return nt_status;
 482
 483         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 484
 485                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 486                 if (!out->data) {
 487                         return NT_STATUS_NO_MEMORY;
 488                 }
 489                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 490
 491                 nt_status = gensec_ntlmssp_sign_packet(gensec_security, sig_mem_ctx,
 492                                                        out->data + NTLMSSP_SIG_SIZE,
 493                                                        out->length - NTLMSSP_SIG_SIZE,
 494                                                        out->data + NTLMSSP_SIG_SIZE,
 495                                                        out->length - NTLMSSP_SIG_SIZE,
 496                                                        &sig);
 497
 498                 if (NT_STATUS_IS_OK(nt_status)) {
 499                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 500                 }
 501                 return nt_status;
 502
 503         } else {
 504                 *out = *in;
 505                 return NT_STATUS_OK;
 506         }
 507 }
 508
 509
 510 NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security,
 511                                TALLOC_CTX *sig_mem_ctx,
 512                                const DATA_BLOB *in,
 513                                DATA_BLOB *out)
 514 {
 515         DATA_BLOB sig;
 516
 517         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 518                 if (in->length < NTLMSSP_SIG_SIZE) {
 519                         return NT_STATUS_INVALID_PARAMETER;
 520                 }
 521                 sig.data = in->data;
 522                 sig.length = NTLMSSP_SIG_SIZE;
 523
 524                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 525
 526                 return gensec_ntlmssp_unseal_packet(gensec_security, sig_mem_ctx,
 527                                                     out->data, out->length,
 528                                                     out->data, out->length,
 529                                                     &sig);
 530
 531         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 532                 if (in->length < NTLMSSP_SIG_SIZE) {
 533                         return NT_STATUS_INVALID_PARAMETER;
 534                 }
 535                 sig.data = in->data;
 536                 sig.length = NTLMSSP_SIG_SIZE;
 537
 538                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 539
 540                 return gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx,
 541                                                    out->data, out->length,
 542                                                    out->data, out->length,
 543                                                    &sig);
 544         } else {
 545                 *out = *in;
 546                 return NT_STATUS_OK;
 547         }
 548 }
 549