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