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 3 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, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "includes.h"
  23 #include "auth/ntlmssp/ntlmssp.h"
  24 #include "../libcli/auth/libcli_auth.h"
  25 #include "../lib/crypto/crypto.h"
  26 #include "auth/gensec/gensec.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 the 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, (const uint8_t *)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                 DEBUG(10, ("NTLM2: created signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
 113                 dump_data(11, sig->data, sig->length);
 114
 115         } else {
 116                 uint32_t crc;
 117                 crc = crc32_calc_buffer(data, length);
 118                 if (!msrpc_gen(sig_mem_ctx,
 119                                sig, "dddd", NTLMSSP_SIGN_VERSION, 0, crc, gensec_ntlmssp_state->crypt.ntlm.seq_num)) {
 120                         return NT_STATUS_NO_MEMORY;
 121                 }
 122                 gensec_ntlmssp_state->crypt.ntlm.seq_num++;
 123
 124                 arcfour_crypt_sbox(gensec_ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
 125
 126                 DEBUG(10, ("NTLM1: created signature over %llu bytes of input:\n", (unsigned long long)length));
 127                 dump_data(11, sig->data, sig->length);
 128         }
 129         return NT_STATUS_OK;
 130 }
 131
 132 NTSTATUS ntlmssp_sign_packet(struct gensec_ntlmssp_state *ntlmssp_state,
 133                              TALLOC_CTX *sig_mem_ctx,
 134                              const uint8_t *data, size_t length,
 135                              const uint8_t *whole_pdu, size_t pdu_length,
 136                              DATA_BLOB *sig)
 137 {
 138         return ntlmssp_make_packet_signature(ntlmssp_state,
 139                                              sig_mem_ctx,
 140                                              data, length,
 141                                              whole_pdu, pdu_length,
 142                                              NTLMSSP_SEND, sig, true);
 143 }
 144
 145 /**
 146  * Check the signature of an incoming packet
 147  *
 148  */
 149
 150 NTSTATUS ntlmssp_check_packet(struct gensec_ntlmssp_state *ntlmssp_state,
 151                               TALLOC_CTX *sig_mem_ctx,
 152                               const uint8_t *data, size_t length,
 153                               const uint8_t *whole_pdu, size_t pdu_length,
 154                               const DATA_BLOB *sig)
 155 {
 156         DATA_BLOB local_sig;
 157         NTSTATUS nt_status;
 158
 159         if (!ntlmssp_state->session_key.length) {
 160                 DEBUG(3, ("NO session key, cannot check packet signature\n"));
 161                 return NT_STATUS_NO_USER_SESSION_KEY;
 162         }
 163
 164         nt_status = ntlmssp_make_packet_signature(ntlmssp_state, sig_mem_ctx,
 165                                                   data, length,
 166                                                   whole_pdu, pdu_length,
 167                                                   NTLMSSP_RECEIVE, &local_sig, true);
 168
 169         if (!NT_STATUS_IS_OK(nt_status)) {
 170                 DEBUG(0, ("NTLMSSP packet sig creation failed with %s\n", nt_errstr(nt_status)));
 171                 return nt_status;
 172         }
 173
 174         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 175                 if (local_sig.length != sig->length ||
 176                     memcmp(local_sig.data,
 177                            sig->data, sig->length) != 0) {
 178
 179                         DEBUG(10, ("BAD SIG NTLM2: wanted signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
 180                         dump_data(10, local_sig.data, local_sig.length);
 181
 182                         DEBUG(10, ("BAD SIG: got signature over %llu bytes of input:\n", (unsigned long long)pdu_length));
 183                         dump_data(10, sig->data, sig->length);
 184
 185                         data_blob_free(&local_sig);
 186                         return NT_STATUS_ACCESS_DENIED;
 187                 }
 188         } else {
 189                 if (local_sig.length != sig->length ||
 190                     memcmp(local_sig.data + 8,
 191                            sig->data + 8, sig->length - 8) != 0) {
 192                         DEBUG(10, ("BAD SIG NTLM1: wanted signature of %llu bytes of input:\n", (unsigned long long)length));
 193                         dump_data(5, local_sig.data, local_sig.length);
 194
 195                         DEBUG(10, ("BAD SIG: got signature of %llu bytes of input:\n", (unsigned long long)length));
 196                         dump_data(10, sig->data, sig->length);
 197
 198                         data_blob_free(&local_sig);
 199                         return NT_STATUS_ACCESS_DENIED;
 200                 }
 201         }
 202         dump_data_pw("checked ntlmssp signature\n", sig->data, sig->length);
 203
 204         data_blob_free(&local_sig);
 205         return NT_STATUS_OK;
 206 }
 207
 208
 209 /**
 210  * Seal data with the NTLMSSP algorithm
 211  *
 212  */
 213
 214 NTSTATUS ntlmssp_seal_packet(struct gensec_ntlmssp_state *ntlmssp_state,
 215                              TALLOC_CTX *sig_mem_ctx,
 216                              uint8_t *data, size_t length,
 217                              const uint8_t *whole_pdu, size_t pdu_length,
 218                              DATA_BLOB *sig)
 219 {
 220         NTSTATUS nt_status;
 221
 222         if (!ntlmssp_state->session_key.length) {
 223                 DEBUG(3, ("NO session key, cannot seal packet\n"));
 224                 return NT_STATUS_NO_USER_SESSION_KEY;
 225         }
 226
 227         DEBUG(10,("ntlmssp_seal_data: seal\n"));
 228         dump_data_pw("ntlmssp clear data\n", data, length);
 229         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 230                 /* The order of these two operations matters - we must first seal the packet,
 231                    then seal the sequence number - this is because the send_seal_hash is not
 232                    constant, but is is rather updated with each iteration */
 233                 nt_status = ntlmssp_make_packet_signature(ntlmssp_state, sig_mem_ctx,
 234                                                           data, length,
 235                                                           whole_pdu, pdu_length,
 236                                                           NTLMSSP_SEND, sig, false);
 237                 arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, data, length);
 238                 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 239                         arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state, sig->data+4, 8);
 240                 }
 241         } else {
 242                 uint32_t crc;
 243                 crc = crc32_calc_buffer(data, length);
 244                 if (!msrpc_gen(sig_mem_ctx,
 245                                sig, "dddd", NTLMSSP_SIGN_VERSION, 0,
 246                                crc, 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 because the ntlmssp_hash is not
 253                    constant, but is is rather updated with each
 254                    iteration */
 255
 256                 arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
 257                 arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm.arcfour_state, sig->data+4, sig->length-4);
 258                 /* increment counter on send */
 259                 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 NTSTATUS ntlmssp_unseal_packet(struct gensec_ntlmssp_state *ntlmssp_state,
 275                                TALLOC_CTX *sig_mem_ctx,
 276                                uint8_t *data, size_t length,
 277                                const uint8_t *whole_pdu, size_t pdu_length,
 278                                const DATA_BLOB *sig)
 279 {
 280         NTSTATUS status;
 281
 282         if (!ntlmssp_state->session_key.length) {
 283                 DEBUG(3, ("NO session key, cannot unseal packet\n"));
 284                 return NT_STATUS_NO_USER_SESSION_KEY;
 285         }
 286
 287         dump_data_pw("ntlmssp sealed data\n", data, length);
 288         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 289                 arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state, data, length);
 290         } else {
 291                 arcfour_crypt_sbox(ntlmssp_state->crypt.ntlm.arcfour_state, data, length);
 292         }
 293         dump_data_pw("ntlmssp clear data\n", data, length);
 294         status = ntlmssp_check_packet(ntlmssp_state, sig_mem_ctx, data, length, whole_pdu, pdu_length, sig);
 295
 296         if (!NT_STATUS_IS_OK(status)) {
 297                 DEBUG(1, ("NTLMSSP packet check for unseal failed due to invalid signature on %llu bytes of input:\n", (unsigned long long)length));
 298         }
 299         return status;
 300 }
 301
 302 /**
 303    Initialise the state for NTLMSSP signing.
 304 */
 305 /* TODO: make this non-public */
 306 NTSTATUS ntlmssp_sign_init(struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 307 {
 308         TALLOC_CTX *mem_ctx = talloc_new(gensec_ntlmssp_state);
 309
 310         if (!mem_ctx) {
 311                 return NT_STATUS_NO_MEMORY;
 312         }
 313
 314         DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
 315         debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
 316
 317         if (gensec_ntlmssp_state->session_key.length < 8) {
 318                 talloc_free(mem_ctx);
 319                 DEBUG(3, ("NO session key, cannot intialise signing\n"));
 320                 return NT_STATUS_NO_USER_SESSION_KEY;
 321         }
 322
 323         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
 324         {
 325                 DATA_BLOB weak_session_key = gensec_ntlmssp_state->session_key;
 326                 const char *send_sign_const;
 327                 const char *send_seal_const;
 328                 const char *recv_sign_const;
 329                 const char *recv_seal_const;
 330
 331                 DATA_BLOB send_seal_key;
 332                 DATA_BLOB recv_seal_key;
 333
 334                 switch (gensec_ntlmssp_state->role) {
 335                 case NTLMSSP_CLIENT:
 336                         send_sign_const = CLI_SIGN;
 337                         send_seal_const = CLI_SEAL;
 338                         recv_sign_const = SRV_SIGN;
 339                         recv_seal_const = SRV_SEAL;
 340                         break;
 341                 case NTLMSSP_SERVER:
 342                         send_sign_const = SRV_SIGN;
 343                         send_seal_const = SRV_SEAL;
 344                         recv_sign_const = CLI_SIGN;
 345                         recv_seal_const = CLI_SEAL;
 346                         break;
 347                 default:
 348                         talloc_free(mem_ctx);
 349                         return NT_STATUS_INTERNAL_ERROR;
 350                 }
 351
 352                 gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 353                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
 354                 gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 355                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state);
 356
 357                 /**
 358                    Weaken NTLMSSP keys to cope with down-level
 359                    clients, servers and export restrictions.
 360
 361                    We probably should have some parameters to control
 362                    this, once we get NTLM2 working.
 363                 */
 364
 365                 /* Key weakening was not performed on the master key
 366                  * for NTLM2 (in ntlmssp_weaken_keys()), but must be
 367                  * done on the encryption subkeys only.  That is why
 368                  * we don't have this code for the ntlmv1 case.
 369                  */
 370
 371                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
 372
 373                 } else if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 374                         weak_session_key.length = 7;
 375                 } else { /* forty bits */
 376                         weak_session_key.length = 5;
 377                 }
 378                 dump_data_pw("NTLMSSP weakend master key:\n",
 379                              weak_session_key.data,
 380                              weak_session_key.length);
 381
 382                 /* SEND: sign key */
 383                 calc_ntlmv2_key(gensec_ntlmssp_state,
 384                                 &gensec_ntlmssp_state->crypt.ntlm2.send_sign_key,
 385                                 gensec_ntlmssp_state->session_key, send_sign_const);
 386                 dump_data_pw("NTLMSSP send sign key:\n",
 387                              gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.data,
 388                              gensec_ntlmssp_state->crypt.ntlm2.send_sign_key.length);
 389
 390                 /* SEND: seal ARCFOUR pad */
 391                 calc_ntlmv2_key(mem_ctx,
 392                                 &send_seal_key,
 393                                 weak_session_key, send_seal_const);
 394                 dump_data_pw("NTLMSSP send seal key:\n",
 395                              send_seal_key.data,
 396                              send_seal_key.length);
 397                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state,
 398                              &send_seal_key);
 399                 dump_data_pw("NTLMSSP send sesl hash:\n",
 400                              gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox,
 401                              sizeof(gensec_ntlmssp_state->crypt.ntlm2.send_seal_arcfour_state->sbox));
 402
 403                 /* RECV: sign key */
 404                 calc_ntlmv2_key(gensec_ntlmssp_state,
 405                                 &gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key,
 406                                 gensec_ntlmssp_state->session_key, recv_sign_const);
 407                 dump_data_pw("NTLMSSP recv sign key:\n",
 408                              gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
 409                              gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.length);
 410
 411                 /* RECV: seal ARCFOUR pad */
 412                 calc_ntlmv2_key(mem_ctx,
 413                                 &recv_seal_key,
 414                                 weak_session_key, recv_seal_const);
 415                 dump_data_pw("NTLMSSP recv seal key:\n",
 416                              recv_seal_key.data,
 417                              recv_seal_key.length);
 418                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state,
 419                              &recv_seal_key);
 420                 dump_data_pw("NTLMSSP receive seal hash:\n",
 421                              gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox,
 422                              sizeof(gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state->sbox));
 423
 424                 gensec_ntlmssp_state->crypt.ntlm2.send_seq_num = 0;
 425                 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = 0;
 426
 427         } else {
 428                 DATA_BLOB weak_session_key = ntlmssp_weakend_key(gensec_ntlmssp_state, mem_ctx);
 429                 DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
 430
 431                 gensec_ntlmssp_state->crypt.ntlm.arcfour_state = talloc(gensec_ntlmssp_state, struct arcfour_state);
 432                 NT_STATUS_HAVE_NO_MEMORY(gensec_ntlmssp_state->crypt.ntlm.arcfour_state);
 433
 434                 arcfour_init(gensec_ntlmssp_state->crypt.ntlm.arcfour_state,
 435                              &weak_session_key);
 436                 dump_data_pw("NTLMSSP hash:\n", gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox,
 437                              sizeof(gensec_ntlmssp_state->crypt.ntlm.arcfour_state->sbox));
 438
 439                 gensec_ntlmssp_state->crypt.ntlm.seq_num = 0;
 440         }
 441
 442         talloc_free(mem_ctx);
 443         return NT_STATUS_OK;
 444 }
 445
 446 NTSTATUS gensec_ntlmssp_sign_packet(struct gensec_security *gensec_security,
 447                                     TALLOC_CTX *sig_mem_ctx,
 448                                     const uint8_t *data, size_t length,
 449                                     const uint8_t *whole_pdu, size_t pdu_length,
 450                                     DATA_BLOB *sig)
 451 {
 452         struct gensec_ntlmssp_context *gensec_ntlmssp =
 453                 talloc_get_type_abort(gensec_security->private_data,
 454                                       struct gensec_ntlmssp_context);
 455         NTSTATUS nt_status;
 456
 457         nt_status = ntlmssp_sign_packet(gensec_ntlmssp->ntlmssp_state,
 458                                         sig_mem_ctx,
 459                                         data, length,
 460                                         whole_pdu, pdu_length,
 461                                         sig);
 462
 463         return nt_status;
 464 }
 465
 466 NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security,
 467                                      TALLOC_CTX *sig_mem_ctx,
 468                                      const uint8_t *data, size_t length,
 469                                      const uint8_t *whole_pdu, size_t pdu_length,
 470                                      const DATA_BLOB *sig)
 471 {
 472         struct gensec_ntlmssp_context *gensec_ntlmssp =
 473                 talloc_get_type_abort(gensec_security->private_data,
 474                                       struct gensec_ntlmssp_context);
 475         NTSTATUS nt_status;
 476
 477         nt_status = ntlmssp_check_packet(gensec_ntlmssp->ntlmssp_state,
 478                                          sig_mem_ctx,
 479                                          data, length,
 480                                          whole_pdu, pdu_length,
 481                                          sig);
 482
 483         return nt_status;
 484 }
 485
 486 NTSTATUS gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security,
 487                                     TALLOC_CTX *sig_mem_ctx,
 488                                     uint8_t *data, size_t length,
 489                                     const uint8_t *whole_pdu, size_t pdu_length,
 490                                     DATA_BLOB *sig)
 491 {
 492         struct gensec_ntlmssp_context *gensec_ntlmssp =
 493                 talloc_get_type_abort(gensec_security->private_data,
 494                                       struct gensec_ntlmssp_context);
 495         NTSTATUS nt_status;
 496
 497         nt_status = ntlmssp_seal_packet(gensec_ntlmssp->ntlmssp_state,
 498                                         sig_mem_ctx,
 499                                         data, length,
 500                                         whole_pdu, pdu_length,
 501                                         sig);
 502
 503         return nt_status;
 504 }
 505
 506 /*
 507   wrappers for the ntlmssp_*() functions
 508 */
 509 NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security,
 510                                       TALLOC_CTX *sig_mem_ctx,
 511                                       uint8_t *data, size_t length,
 512                                       const uint8_t *whole_pdu, size_t pdu_length,
 513                                       const DATA_BLOB *sig)
 514 {
 515         struct gensec_ntlmssp_context *gensec_ntlmssp =
 516                 talloc_get_type_abort(gensec_security->private_data,
 517                                       struct gensec_ntlmssp_context);
 518         NTSTATUS nt_status;
 519
 520         nt_status = ntlmssp_unseal_packet(gensec_ntlmssp->ntlmssp_state,
 521                                           sig_mem_ctx,
 522                                           data, length,
 523                                           whole_pdu, pdu_length,
 524                                           sig);
 525
 526         return nt_status;
 527 }
 528
 529 size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security, size_t data_size)
 530 {
 531         return NTLMSSP_SIG_SIZE;
 532 }
 533
 534 NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security,
 535                              TALLOC_CTX *sig_mem_ctx,
 536                              const DATA_BLOB *in,
 537                              DATA_BLOB *out)
 538 {
 539         DATA_BLOB sig;
 540         NTSTATUS nt_status;
 541
 542         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 543
 544                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 545                 if (!out->data) {
 546                         return NT_STATUS_NO_MEMORY;
 547                 }
 548                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 549
 550                 nt_status = gensec_ntlmssp_seal_packet(gensec_security, sig_mem_ctx,
 551                                                        out->data + NTLMSSP_SIG_SIZE,
 552                                                        out->length - NTLMSSP_SIG_SIZE,
 553                                                        out->data + NTLMSSP_SIG_SIZE,
 554                                                        out->length - NTLMSSP_SIG_SIZE,
 555                                                        &sig);
 556
 557                 if (NT_STATUS_IS_OK(nt_status)) {
 558                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 559                 }
 560                 return nt_status;
 561
 562         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 563
 564                 *out = data_blob_talloc(sig_mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
 565                 if (!out->data) {
 566                         return NT_STATUS_NO_MEMORY;
 567                 }
 568                 memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
 569
 570                 nt_status = gensec_ntlmssp_sign_packet(gensec_security, sig_mem_ctx,
 571                                                        out->data + NTLMSSP_SIG_SIZE,
 572                                                        out->length - NTLMSSP_SIG_SIZE,
 573                                                        out->data + NTLMSSP_SIG_SIZE,
 574                                                        out->length - NTLMSSP_SIG_SIZE,
 575                                                        &sig);
 576
 577                 if (NT_STATUS_IS_OK(nt_status)) {
 578                         memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
 579                 }
 580                 return nt_status;
 581
 582         } else {
 583                 *out = *in;
 584                 return NT_STATUS_OK;
 585         }
 586 }
 587
 588
 589 NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security,
 590                                TALLOC_CTX *sig_mem_ctx,
 591                                const DATA_BLOB *in,
 592                                DATA_BLOB *out)
 593 {
 594         struct gensec_ntlmssp_context *gensec_ntlmssp =
 595                 talloc_get_type_abort(gensec_security->private_data,
 596                                       struct gensec_ntlmssp_context);
 597         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 598         DATA_BLOB sig;
 599
 600         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 601                 if (in->length < NTLMSSP_SIG_SIZE) {
 602                         return NT_STATUS_INVALID_PARAMETER;
 603                 }
 604                 sig.data = in->data;
 605                 sig.length = NTLMSSP_SIG_SIZE;
 606
 607                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 608
 609                 return gensec_ntlmssp_unseal_packet(gensec_security, sig_mem_ctx,
 610                                                     out->data, out->length,
 611                                                     out->data, out->length,
 612                                                     &sig);
 613
 614         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 615                 NTSTATUS status;
 616                 uint32_t ntlm_seqnum;
 617                 struct arcfour_state ntlm_state;
 618                 uint32_t ntlm2_seqnum_r;
 619                 uint8_t ntlm2_key_r[16];
 620                 struct arcfour_state ntlm2_state_r;
 621
 622                 if (in->length < NTLMSSP_SIG_SIZE) {
 623                         return NT_STATUS_INVALID_PARAMETER;
 624                 }
 625                 sig.data = in->data;
 626                 sig.length = NTLMSSP_SIG_SIZE;
 627                 *out = data_blob_talloc(sig_mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
 628
 629                 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 630                         ntlm2_seqnum_r = gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num;
 631                         ntlm2_state_r = *gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state;
 632                         memcpy(ntlm2_key_r,
 633                                gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
 634                                16);
 635                 } else {
 636                         ntlm_seqnum = gensec_ntlmssp_state->crypt.ntlm.seq_num;
 637                         ntlm_state = *gensec_ntlmssp_state->crypt.ntlm.arcfour_state;
 638                 }
 639
 640                 status = gensec_ntlmssp_check_packet(gensec_security, sig_mem_ctx,
 641                                                      out->data, out->length,
 642                                                      out->data, out->length,
 643                                                      &sig);
 644                 if (!NT_STATUS_IS_OK(status)) {
 645                         NTSTATUS check_status = status;
 646                         /*
 647                          * The Windows LDAP libraries seems to have a bug
 648                          * and always use sealing even if only signing was
 649                          * negotiated. So we need to fallback.
 650                          */
 651
 652                         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 653                                 gensec_ntlmssp_state->crypt.ntlm2.recv_seq_num = ntlm2_seqnum_r;
 654                                 *gensec_ntlmssp_state->crypt.ntlm2.recv_seal_arcfour_state = ntlm2_state_r;
 655                                 memcpy(gensec_ntlmssp_state->crypt.ntlm2.recv_sign_key.data,
 656                                        ntlm2_key_r, 16);
 657                         } else {
 658                                 gensec_ntlmssp_state->crypt.ntlm.seq_num = ntlm_seqnum;
 659                                 *gensec_ntlmssp_state->crypt.ntlm.arcfour_state = ntlm_state;
 660                         }
 661
 662                         status = gensec_ntlmssp_unseal_packet(gensec_security,
 663                                                               sig_mem_ctx,
 664                                                               out->data,
 665                                                               out->length,
 666                                                               out->data,
 667                                                               out->length,
 668                                                               &sig);
 669                         if (NT_STATUS_IS_OK(status)) {
 670                                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 671                         } else {
 672                                 status = check_status;
 673                         }
 674                 }
 675
 676                 if (!NT_STATUS_IS_OK(status)) {
 677                         DEBUG(1, ("NTLMSSP packet check for unwrap failed due to invalid signature\n"));
 678                 }
 679                 return status;
 680         } else {
 681                 *out = *in;
 682                 return NT_STATUS_OK;
 683         }
 684 }
 685