source3/smbd/seal.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB Transport encryption (sealing) code - server code.
   4    Copyright (C) Jeremy Allison 2007.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 /******************************************************************************
  23  Server side encryption.
  24 ******************************************************************************/
  25
  26 /******************************************************************************
  27  Global server state.
  28 ******************************************************************************/
  29
  30 struct smb_srv_trans_enc_ctx {
  31         struct smb_trans_enc_state *es;
  32         AUTH_NTLMSSP_STATE *auth_ntlmssp_state; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
  33 };
  34
  35 static struct smb_srv_trans_enc_ctx *partial_srv_trans_enc_ctx;
  36 static struct smb_srv_trans_enc_ctx *srv_trans_enc_ctx;
  37
  38 /******************************************************************************
  39  Return global enc context - this must change if we ever do multiple contexts.
  40 ******************************************************************************/
  41
  42 uint16_t srv_enc_ctx(void)
  43 {
  44         return srv_trans_enc_ctx->es->enc_ctx_num;
  45 }
  46
  47 /******************************************************************************
  48  Is this an incoming encrypted packet ?
  49 ******************************************************************************/
  50
  51 bool is_encrypted_packet(const uint8_t *inbuf)
  52 {
  53         NTSTATUS status;
  54         uint16_t enc_num;
  55
  56         /* Ignore non-session messages or non 0xFF'E' messages. */
  57         if(CVAL(inbuf,0) || !(inbuf[4] == 0xFF && inbuf[5] == 'E')) {
  58                 return false;
  59         }
  60
  61         status = get_enc_ctx_num(inbuf, &enc_num);
  62         if (!NT_STATUS_IS_OK(status)) {
  63                 return false;
  64         }
  65
  66         /* Encrypted messages are 0xFF'E'<ctx> */
  67         if (srv_trans_enc_ctx && enc_num == srv_enc_ctx()) {
  68                 return true;
  69         }
  70         return false;
  71 }
  72
  73 /******************************************************************************
  74  Create an auth_ntlmssp_state and ensure pointer copy is correct.
  75 ******************************************************************************/
  76
  77 static NTSTATUS make_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
  78 {
  79         NTSTATUS status = auth_ntlmssp_start(&ec->auth_ntlmssp_state);
  80         if (!NT_STATUS_IS_OK(status)) {
  81                 return nt_status_squash(status);
  82         }
  83
  84         /*
  85          * We must remember to update the pointer copy for the common
  86          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
  87          */
  88         ec->es->s.ntlmssp_state = ec->auth_ntlmssp_state->ntlmssp_state;
  89         return status;
  90 }
  91
  92 /******************************************************************************
  93  Destroy an auth_ntlmssp_state and ensure pointer copy is correct.
  94 ******************************************************************************/
  95
  96 static void destroy_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
  97 {
  98         /*
  99          * We must remember to update the pointer copy for the common
 100          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
 101          */
 102
 103         if (ec->auth_ntlmssp_state) {
 104                 auth_ntlmssp_end(&ec->auth_ntlmssp_state);
 105                 /* The auth_ntlmssp_end killed this already. */
 106                 ec->es->s.ntlmssp_state = NULL;
 107         }
 108 }
 109
 110 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 111
 112 /******************************************************************************
 113  Import a name.
 114 ******************************************************************************/
 115
 116 static NTSTATUS get_srv_gss_creds(const char *service,
 117                                 const char *name,
 118                                 gss_cred_usage_t cred_type,
 119                                 gss_cred_id_t *p_srv_cred)
 120 {
 121         OM_uint32 ret;
 122         OM_uint32 min;
 123         gss_name_t srv_name;
 124         gss_buffer_desc input_name;
 125         char *host_princ_s = NULL;
 126         NTSTATUS status = NT_STATUS_OK;
 127
 128         gss_OID_desc nt_hostbased_service =
 129         {10, CONST_DISCARD(char *,"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
 130
 131         asprintf(&host_princ_s, "%s@%s", service, name);
 132         if (host_princ_s == NULL) {
 133                 return NT_STATUS_NO_MEMORY;
 134         }
 135
 136         input_name.value = host_princ_s;
 137         input_name.length = strlen(host_princ_s) + 1;
 138
 139         ret = gss_import_name(&min,
 140                                 &input_name,
 141                                 &nt_hostbased_service,
 142                                 &srv_name);
 143
 144         DEBUG(10,("get_srv_gss_creds: imported name %s\n",
 145                 host_princ_s ));
 146
 147         if (ret != GSS_S_COMPLETE) {
 148                 SAFE_FREE(host_princ_s);
 149                 return map_nt_error_from_gss(ret, min);
 150         }
 151
 152         /*
 153          * We're accessing the krb5.keytab file here.
 154          * ensure we have permissions to do so.
 155          */
 156         become_root();
 157
 158         ret = gss_acquire_cred(&min,
 159                                 srv_name,
 160                                 GSS_C_INDEFINITE,
 161                                 GSS_C_NULL_OID_SET,
 162                                 cred_type,
 163                                 p_srv_cred,
 164                                 NULL,
 165                                 NULL);
 166         unbecome_root();
 167
 168         if (ret != GSS_S_COMPLETE) {
 169                 ADS_STATUS adss = ADS_ERROR_GSS(ret, min);
 170                 DEBUG(10,("get_srv_gss_creds: gss_acquire_cred failed with %s\n",
 171                         ads_errstr(adss)));
 172                 status = map_nt_error_from_gss(ret, min);
 173         }
 174
 175         SAFE_FREE(host_princ_s);
 176         gss_release_name(&min, &srv_name);
 177         return status;
 178 }
 179
 180 /******************************************************************************
 181  Create a gss state.
 182  Try and get the cifs/server@realm principal first, then fall back to
 183  host/server@realm.
 184 ******************************************************************************/
 185
 186 static NTSTATUS make_auth_gss(struct smb_srv_trans_enc_ctx *ec)
 187 {
 188         NTSTATUS status;
 189         gss_cred_id_t srv_cred;
 190         fstring fqdn;
 191
 192         name_to_fqdn(fqdn, global_myname());
 193         strlower_m(fqdn);
 194
 195         status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
 196         if (!NT_STATUS_IS_OK(status)) {
 197                 status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred);
 198                 if (!NT_STATUS_IS_OK(status)) {
 199                         return nt_status_squash(status);
 200                 }
 201         }
 202
 203         ec->es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss);
 204         if (!ec->es->s.gss_state) {
 205                 OM_uint32 min;
 206                 gss_release_cred(&min, &srv_cred);
 207                 return NT_STATUS_NO_MEMORY;
 208         }
 209         ZERO_STRUCTP(ec->es->s.gss_state);
 210         ec->es->s.gss_state->creds = srv_cred;
 211
 212         /* No context yet. */
 213         ec->es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT;
 214
 215         return NT_STATUS_OK;
 216 }
 217 #endif
 218
 219 /******************************************************************************
 220  Shutdown a server encryption context.
 221 ******************************************************************************/
 222
 223 static void srv_free_encryption_context(struct smb_srv_trans_enc_ctx **pp_ec)
 224 {
 225         struct smb_srv_trans_enc_ctx *ec = *pp_ec;
 226
 227         if (!ec) {
 228                 return;
 229         }
 230
 231         if (ec->es) {
 232                 switch (ec->es->smb_enc_type) {
 233                         case SMB_TRANS_ENC_NTLM:
 234                                 destroy_auth_ntlmssp(ec);
 235                                 break;
 236 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 237                         case SMB_TRANS_ENC_GSS:
 238                                 break;
 239 #endif
 240                 }
 241                 common_free_encryption_state(&ec->es);
 242         }
 243
 244         SAFE_FREE(ec);
 245         *pp_ec = NULL;
 246 }
 247
 248 /******************************************************************************
 249  Create a server encryption context.
 250 ******************************************************************************/
 251
 252 static NTSTATUS make_srv_encryption_context(enum smb_trans_enc_type smb_enc_type, struct smb_srv_trans_enc_ctx **pp_ec)
 253 {
 254         struct smb_srv_trans_enc_ctx *ec;
 255
 256         *pp_ec = NULL;
 257
 258         ec = SMB_MALLOC_P(struct smb_srv_trans_enc_ctx);
 259         if (!ec) {
 260                 return NT_STATUS_NO_MEMORY;
 261         }
 262         ZERO_STRUCTP(partial_srv_trans_enc_ctx);
 263         ec->es = SMB_MALLOC_P(struct smb_trans_enc_state);
 264         if (!ec->es) {
 265                 SAFE_FREE(ec);
 266                 return NT_STATUS_NO_MEMORY;
 267         }
 268         ZERO_STRUCTP(ec->es);
 269         ec->es->smb_enc_type = smb_enc_type;
 270         switch (smb_enc_type) {
 271                 case SMB_TRANS_ENC_NTLM:
 272                         {
 273                                 NTSTATUS status = make_auth_ntlmssp(ec);
 274                                 if (!NT_STATUS_IS_OK(status)) {
 275                                         srv_free_encryption_context(&ec);
 276                                         return status;
 277                                 }
 278                         }
 279                         break;
 280
 281 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 282                 case SMB_TRANS_ENC_GSS:
 283                         /* Acquire our credentials by calling gss_acquire_cred here. */
 284                         {
 285                                 NTSTATUS status = make_auth_gss(ec);
 286                                 if (!NT_STATUS_IS_OK(status)) {
 287                                         srv_free_encryption_context(&ec);
 288                                         return status;
 289                                 }
 290                         }
 291                         break;
 292 #endif
 293                 default:
 294                         srv_free_encryption_context(&ec);
 295                         return NT_STATUS_INVALID_PARAMETER;
 296         }
 297         *pp_ec = ec;
 298         return NT_STATUS_OK;
 299 }
 300
 301 /******************************************************************************
 302  Free an encryption-allocated buffer.
 303 ******************************************************************************/
 304
 305 void srv_free_enc_buffer(char *buf)
 306 {
 307         /* We know this is an smb buffer, and we
 308          * didn't malloc, only copy, for a keepalive,
 309          * so ignore non-session messages. */
 310
 311         if(CVAL(buf,0)) {
 312                 return;
 313         }
 314
 315         if (srv_trans_enc_ctx) {
 316                 common_free_enc_buffer(srv_trans_enc_ctx->es, buf);
 317         }
 318 }
 319
 320 /******************************************************************************
 321  Decrypt an incoming buffer.
 322 ******************************************************************************/
 323
 324 NTSTATUS srv_decrypt_buffer(char *buf)
 325 {
 326         /* Ignore non-session messages. */
 327         if(CVAL(buf,0)) {
 328                 return NT_STATUS_OK;
 329         }
 330
 331         if (srv_trans_enc_ctx) {
 332                 return common_decrypt_buffer(srv_trans_enc_ctx->es, buf);
 333         }
 334
 335         return NT_STATUS_OK;
 336 }
 337
 338 /******************************************************************************
 339  Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
 340 ******************************************************************************/
 341
 342 NTSTATUS srv_encrypt_buffer(char *buf, char **buf_out)
 343 {
 344         *buf_out = buf;
 345
 346         /* Ignore non-session messages. */
 347         if(CVAL(buf,0)) {
 348                 return NT_STATUS_OK;
 349         }
 350
 351         if (srv_trans_enc_ctx) {
 352                 return common_encrypt_buffer(srv_trans_enc_ctx->es, buf, buf_out);
 353         }
 354         /* Not encrypting. */
 355         return NT_STATUS_OK;
 356 }
 357
 358 /******************************************************************************
 359  Do the gss encryption negotiation. Parameters are in/out.
 360  Until success we do everything on the partial enc ctx.
 361 ******************************************************************************/
 362
 363 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 364 static NTSTATUS srv_enc_spnego_gss_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob)
 365 {
 366         OM_uint32 ret;
 367         OM_uint32 min;
 368         OM_uint32 flags = 0;
 369         gss_buffer_desc in_buf, out_buf;
 370         struct smb_tran_enc_state_gss *gss_state;
 371         DATA_BLOB auth_reply = data_blob_null;
 372         DATA_BLOB response = data_blob_null;
 373         NTSTATUS status;
 374
 375         if (!partial_srv_trans_enc_ctx) {
 376                 status = make_srv_encryption_context(SMB_TRANS_ENC_GSS, &partial_srv_trans_enc_ctx);
 377                 if (!NT_STATUS_IS_OK(status)) {
 378                         return status;
 379                 }
 380         }
 381
 382         gss_state = partial_srv_trans_enc_ctx->es->s.gss_state;
 383
 384         in_buf.value = secblob.data;
 385         in_buf.length = secblob.length;
 386
 387         out_buf.value = NULL;
 388         out_buf.length = 0;
 389
 390         become_root();
 391
 392         ret = gss_accept_sec_context(&min,
 393                                 &gss_state->gss_ctx,
 394                                 gss_state->creds,
 395                                 &in_buf,
 396                                 GSS_C_NO_CHANNEL_BINDINGS,
 397                                 NULL,
 398                                 NULL,           /* Ignore oids. */
 399                                 &out_buf,       /* To return. */
 400                                 &flags,
 401                                 NULL,           /* Ingore time. */
 402                                 NULL);          /* Ignore delegated creds. */
 403         unbecome_root();
 404
 405         status = gss_err_to_ntstatus(ret, min);
 406         if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
 407                 return status;
 408         }
 409
 410         /* Ensure we've got sign+seal available. */
 411         if (ret == GSS_S_COMPLETE) {
 412                 if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) !=
 413                                 (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) {
 414                         DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough "
 415                                 "for SMB sealing.\n"));
 416                         gss_release_buffer(&min, &out_buf);
 417                         return NT_STATUS_ACCESS_DENIED;
 418                 }
 419         }
 420
 421         auth_reply = data_blob(out_buf.value, out_buf.length);
 422         gss_release_buffer(&min, &out_buf);
 423
 424         /* Wrap in SPNEGO. */
 425         response = spnego_gen_auth_response(&auth_reply, status, OID_KERBEROS5);
 426         data_blob_free(&auth_reply);
 427
 428         SAFE_FREE(*ppdata);
 429         *ppdata = response.data;
 430         *p_data_size = response.length;
 431
 432         return status;
 433 }
 434 #endif
 435
 436 /******************************************************************************
 437  Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out.
 438  Until success we do everything on the partial enc ctx.
 439 ******************************************************************************/
 440
 441 static NTSTATUS srv_enc_ntlm_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob, bool spnego_wrap)
 442 {
 443         NTSTATUS status;
 444         DATA_BLOB chal = data_blob_null;
 445         DATA_BLOB response = data_blob_null;
 446
 447         status = make_srv_encryption_context(SMB_TRANS_ENC_NTLM, &partial_srv_trans_enc_ctx);
 448         if (!NT_STATUS_IS_OK(status)) {
 449                 return status;
 450         }
 451
 452         status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, secblob, &chal);
 453
 454         /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
 455          * for success ... */
 456
 457         if (spnego_wrap) {
 458                 response = spnego_gen_auth_response(&chal, status, OID_NTLMSSP);
 459                 data_blob_free(&chal);
 460         } else {
 461                 /* Return the raw blob. */
 462                 response = chal;
 463         }
 464
 465         SAFE_FREE(*ppdata);
 466         *ppdata = response.data;
 467         *p_data_size = response.length;
 468         return status;
 469 }
 470
 471 /******************************************************************************
 472  Do the SPNEGO encryption negotiation. Parameters are in/out.
 473  Based off code in smbd/sesssionsetup.c
 474  Until success we do everything on the partial enc ctx.
 475 ******************************************************************************/
 476
 477 static NTSTATUS srv_enc_spnego_negotiate(connection_struct *conn,
 478                                         unsigned char **ppdata,
 479                                         size_t *p_data_size,
 480                                         unsigned char **pparam,
 481                                         size_t *p_param_size)
 482 {
 483         NTSTATUS status;
 484         DATA_BLOB blob = data_blob_null;
 485         DATA_BLOB secblob = data_blob_null;
 486         char *kerb_mech = NULL;
 487
 488         blob = data_blob_const(*ppdata, *p_data_size);
 489
 490         status = parse_spnego_mechanisms(blob, &secblob, &kerb_mech);
 491         if (!NT_STATUS_IS_OK(status)) {
 492                 return nt_status_squash(status);
 493         }
 494
 495         /* We should have no partial context at this point. */
 496
 497         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 498
 499         if (kerb_mech) {
 500                 SAFE_FREE(kerb_mech);
 501
 502 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 503                 status = srv_enc_spnego_gss_negotiate(ppdata, p_data_size, secblob);
 504 #else
 505                 /* Currently we don't SPNEGO negotiate
 506                  * back to NTLMSSP as we do in sessionsetupX. We should... */
 507                 return NT_STATUS_LOGON_FAILURE;
 508 #endif
 509         } else {
 510                 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, secblob, true);
 511         }
 512
 513         data_blob_free(&secblob);
 514
 515         if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 516                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 517                 return nt_status_squash(status);
 518         }
 519
 520         if (NT_STATUS_IS_OK(status)) {
 521                 /* Return the context we're using for this encryption state. */
 522                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 523                         return NT_STATUS_NO_MEMORY;
 524                 }
 525                 SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
 526                 *p_param_size = 2;
 527         }
 528
 529         return status;
 530 }
 531
 532 /******************************************************************************
 533  Complete a SPNEGO encryption negotiation. Parameters are in/out.
 534  We only get this for a NTLM auth second stage.
 535 ******************************************************************************/
 536
 537 static NTSTATUS srv_enc_spnego_ntlm_auth(connection_struct *conn,
 538                                         unsigned char **ppdata,
 539                                         size_t *p_data_size,
 540                                         unsigned char **pparam,
 541                                         size_t *p_param_size)
 542 {
 543         NTSTATUS status;
 544         DATA_BLOB blob = data_blob_null;
 545         DATA_BLOB auth = data_blob_null;
 546         DATA_BLOB auth_reply = data_blob_null;
 547         DATA_BLOB response = data_blob_null;
 548         struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
 549
 550         /* We must have a partial context here. */
 551
 552         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 553                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 554                 return NT_STATUS_INVALID_PARAMETER;
 555         }
 556
 557         blob = data_blob_const(*ppdata, *p_data_size);
 558         if (!spnego_parse_auth(blob, &auth)) {
 559                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 560                 return NT_STATUS_INVALID_PARAMETER;
 561         }
 562
 563         status = auth_ntlmssp_update(ec->auth_ntlmssp_state, auth, &auth_reply);
 564         data_blob_free(&auth);
 565
 566         /* From RFC4178.
 567          *
 568          *    supportedMech
 569          *
 570          *          This field SHALL only be present in the first reply from the
 571          *                target.
 572          * So set mechOID to NULL here.
 573          */
 574
 575         response = spnego_gen_auth_response(&auth_reply, status, NULL);
 576         data_blob_free(&auth_reply);
 577
 578         if (NT_STATUS_IS_OK(status)) {
 579                 /* Return the context we're using for this encryption state. */
 580                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 581                         return NT_STATUS_NO_MEMORY;
 582                 }
 583                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 584                 *p_param_size = 2;
 585         }
 586
 587         SAFE_FREE(*ppdata);
 588         *ppdata = response.data;
 589         *p_data_size = response.length;
 590         return status;
 591 }
 592
 593 /******************************************************************************
 594  Raw NTLM encryption negotiation. Parameters are in/out.
 595  This function does both steps.
 596 ******************************************************************************/
 597
 598 static NTSTATUS srv_enc_raw_ntlm_auth(connection_struct *conn,
 599                                         unsigned char **ppdata,
 600                                         size_t *p_data_size,
 601                                         unsigned char **pparam,
 602                                         size_t *p_param_size)
 603 {
 604         NTSTATUS status;
 605         DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
 606         DATA_BLOB response = data_blob_null;
 607         struct smb_srv_trans_enc_ctx *ec;
 608
 609         if (!partial_srv_trans_enc_ctx) {
 610                 /* This is the initial step. */
 611                 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, blob, false);
 612                 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 613                         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 614                         return nt_status_squash(status);
 615                 }
 616                 return status;
 617         }
 618
 619         ec = partial_srv_trans_enc_ctx;
 620         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 621                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 622                 return NT_STATUS_INVALID_PARAMETER;
 623         }
 624
 625         /* Second step. */
 626         status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, blob, &response);
 627
 628         if (NT_STATUS_IS_OK(status)) {
 629                 /* Return the context we're using for this encryption state. */
 630                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 631                         return NT_STATUS_NO_MEMORY;
 632                 }
 633                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 634                 *p_param_size = 2;
 635         }
 636
 637         /* Return the raw blob. */
 638         SAFE_FREE(*ppdata);
 639         *ppdata = response.data;
 640         *p_data_size = response.length;
 641         return status;
 642 }
 643
 644 /******************************************************************************
 645  Do the SPNEGO encryption negotiation. Parameters are in/out.
 646 ******************************************************************************/
 647
 648 NTSTATUS srv_request_encryption_setup(connection_struct *conn,
 649                                         unsigned char **ppdata,
 650                                         size_t *p_data_size,
 651                                         unsigned char **pparam,
 652                                         size_t *p_param_size)
 653 {
 654         unsigned char *pdata = *ppdata;
 655
 656         SAFE_FREE(*pparam);
 657         *p_param_size = 0;
 658
 659         if (*p_data_size < 1) {
 660                 return NT_STATUS_INVALID_PARAMETER;
 661         }
 662
 663         if (pdata[0] == ASN1_APPLICATION(0)) {
 664                 /* its a negTokenTarg packet */
 665                 return srv_enc_spnego_negotiate(conn, ppdata, p_data_size, pparam, p_param_size);
 666         }
 667
 668         if (pdata[0] == ASN1_CONTEXT(1)) {
 669                 /* It's an auth packet */
 670                 return srv_enc_spnego_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 671         }
 672
 673         /* Maybe it's a raw unwrapped auth ? */
 674         if (*p_data_size < 7) {
 675                 return NT_STATUS_INVALID_PARAMETER;
 676         }
 677
 678         if (strncmp((char *)pdata, "NTLMSSP", 7) == 0) {
 679                 return srv_enc_raw_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 680         }
 681
 682         DEBUG(1,("srv_request_encryption_setup: Unknown packet\n"));
 683
 684         return NT_STATUS_LOGON_FAILURE;
 685 }
 686
 687 /******************************************************************************
 688  Negotiation was successful - turn on server-side encryption.
 689 ******************************************************************************/
 690
 691 static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
 692 {
 693         if (!ec || !ec->es) {
 694                 return NT_STATUS_LOGON_FAILURE;
 695         }
 696
 697         if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
 698                 if ((ec->es->s.ntlmssp_state->neg_flags & (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) !=
 699                                 (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) {
 700                         return NT_STATUS_INVALID_PARAMETER;
 701                 }
 702         }
 703         /* Todo - check gssapi case. */
 704
 705         return NT_STATUS_OK;
 706 }
 707
 708 /******************************************************************************
 709  Negotiation was successful - turn on server-side encryption.
 710 ******************************************************************************/
 711
 712 NTSTATUS srv_encryption_start(connection_struct *conn)
 713 {
 714         NTSTATUS status;
 715
 716         /* Check that we are really doing sign+seal. */
 717         status = check_enc_good(partial_srv_trans_enc_ctx);
 718         if (!NT_STATUS_IS_OK(status)) {
 719                 return status;
 720         }
 721         /* Throw away the context we're using currently (if any). */
 722         srv_free_encryption_context(&srv_trans_enc_ctx);
 723
 724         /* Steal the partial pointer. Deliberate shallow copy. */
 725         srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
 726         srv_trans_enc_ctx->es->enc_on = true;
 727
 728         partial_srv_trans_enc_ctx = NULL;
 729
 730         DEBUG(1,("srv_encryption_start: context negotiated\n"));
 731         return NT_STATUS_OK;
 732 }
 733
 734 /******************************************************************************
 735  Shutdown all server contexts.
 736 ******************************************************************************/
 737
 738 void server_encryption_shutdown(void)
 739 {
 740         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 741         srv_free_encryption_context(&srv_trans_enc_ctx);
 742 }