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 #include "smbd/globals.h"
  22 #include "../libcli/auth/spnego.h"
  23 #include "../libcli/auth/ntlmssp.h"
  24 #include "ntlmssp_wrap.h"
  25
  26 /******************************************************************************
  27  Server side encryption.
  28 ******************************************************************************/
  29
  30 /******************************************************************************
  31  Global server state.
  32 ******************************************************************************/
  33
  34 struct smb_srv_trans_enc_ctx {
  35         struct smb_trans_enc_state *es;
  36         struct auth_ntlmssp_state *auth_ntlmssp_state; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
  37 };
  38
  39 /******************************************************************************
  40  Return global enc context - this must change if we ever do multiple contexts.
  41 ******************************************************************************/
  42
  43 uint16_t srv_enc_ctx(void)
  44 {
  45         return srv_trans_enc_ctx->es->enc_ctx_num;
  46 }
  47
  48 /******************************************************************************
  49  Is this an incoming encrypted packet ?
  50 ******************************************************************************/
  51
  52 bool is_encrypted_packet(const uint8_t *inbuf)
  53 {
  54         NTSTATUS status;
  55         uint16_t enc_num;
  56
  57         /* Ignore non-session messages or non 0xFF'E' messages. */
  58         if(CVAL(inbuf,0)
  59            || (smb_len(inbuf) < 8)
  60            || !(inbuf[4] == 0xFF && inbuf[5] == 'E')) {
  61                 return false;
  62         }
  63
  64         status = get_enc_ctx_num(inbuf, &enc_num);
  65         if (!NT_STATUS_IS_OK(status)) {
  66                 return false;
  67         }
  68
  69         /* Encrypted messages are 0xFF'E'<ctx> */
  70         if (srv_trans_enc_ctx && enc_num == srv_enc_ctx()) {
  71                 return true;
  72         }
  73         return false;
  74 }
  75
  76 /******************************************************************************
  77  Create an auth_ntlmssp_state and ensure pointer copy is correct.
  78 ******************************************************************************/
  79
  80 static NTSTATUS make_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
  81 {
  82         NTSTATUS status = auth_ntlmssp_start(&ec->auth_ntlmssp_state);
  83         if (!NT_STATUS_IS_OK(status)) {
  84                 return nt_status_squash(status);
  85         }
  86
  87         /*
  88          * We must remember to update the pointer copy for the common
  89          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
  90          */
  91         ec->es->s.ntlmssp_state = auth_ntlmssp_get_ntlmssp_state(ec->auth_ntlmssp_state);
  92         return status;
  93 }
  94
  95 /******************************************************************************
  96  Destroy an auth_ntlmssp_state and ensure pointer copy is correct.
  97 ******************************************************************************/
  98
  99 static void destroy_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
 100 {
 101         /*
 102          * We must remember to update the pointer copy for the common
 103          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
 104          */
 105
 106         if (ec->auth_ntlmssp_state) {
 107                 TALLOC_FREE(ec->auth_ntlmssp_state);
 108                 /* The auth_ntlmssp_end killed this already. */
 109                 ec->es->s.ntlmssp_state = NULL;
 110         }
 111 }
 112
 113 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 114
 115 /******************************************************************************
 116  Import a name.
 117 ******************************************************************************/
 118
 119 static NTSTATUS get_srv_gss_creds(const char *service,
 120                                 const char *name,
 121                                 gss_cred_usage_t cred_type,
 122                                 gss_cred_id_t *p_srv_cred)
 123 {
 124         OM_uint32 ret;
 125         OM_uint32 min;
 126         gss_name_t srv_name;
 127         gss_buffer_desc input_name;
 128         char *host_princ_s = NULL;
 129         NTSTATUS status = NT_STATUS_OK;
 130
 131         gss_OID_desc nt_hostbased_service =
 132         {10, CONST_DISCARD(char *,"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
 133
 134         if (asprintf(&host_princ_s, "%s@%s", service, name) == -1) {
 135                 return NT_STATUS_NO_MEMORY;
 136         }
 137
 138         input_name.value = host_princ_s;
 139         input_name.length = strlen(host_princ_s) + 1;
 140
 141         ret = gss_import_name(&min,
 142                                 &input_name,
 143                                 &nt_hostbased_service,
 144                                 &srv_name);
 145
 146         DEBUG(10,("get_srv_gss_creds: imported name %s\n",
 147                 host_princ_s ));
 148
 149         if (ret != GSS_S_COMPLETE) {
 150                 SAFE_FREE(host_princ_s);
 151                 return map_nt_error_from_gss(ret, min);
 152         }
 153
 154         /*
 155          * We're accessing the krb5.keytab file here.
 156          * ensure we have permissions to do so.
 157          */
 158         become_root();
 159
 160         ret = gss_acquire_cred(&min,
 161                                 srv_name,
 162                                 GSS_C_INDEFINITE,
 163                                 GSS_C_NULL_OID_SET,
 164                                 cred_type,
 165                                 p_srv_cred,
 166                                 NULL,
 167                                 NULL);
 168         unbecome_root();
 169
 170         if (ret != GSS_S_COMPLETE) {
 171                 ADS_STATUS adss = ADS_ERROR_GSS(ret, min);
 172                 DEBUG(10,("get_srv_gss_creds: gss_acquire_cred failed with %s\n",
 173                         ads_errstr(adss)));
 174                 status = map_nt_error_from_gss(ret, min);
 175         }
 176
 177         SAFE_FREE(host_princ_s);
 178         gss_release_name(&min, &srv_name);
 179         return status;
 180 }
 181
 182 /******************************************************************************
 183  Create a gss state.
 184  Try and get the cifs/server@realm principal first, then fall back to
 185  host/server@realm.
 186 ******************************************************************************/
 187
 188 static NTSTATUS make_auth_gss(struct smb_srv_trans_enc_ctx *ec)
 189 {
 190         NTSTATUS status;
 191         gss_cred_id_t srv_cred;
 192         fstring fqdn;
 193
 194         name_to_fqdn(fqdn, global_myname());
 195         strlower_m(fqdn);
 196
 197         status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
 198         if (!NT_STATUS_IS_OK(status)) {
 199                 status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred);
 200                 if (!NT_STATUS_IS_OK(status)) {
 201                         return nt_status_squash(status);
 202                 }
 203         }
 204
 205         ec->es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss);
 206         if (!ec->es->s.gss_state) {
 207                 OM_uint32 min;
 208                 gss_release_cred(&min, &srv_cred);
 209                 return NT_STATUS_NO_MEMORY;
 210         }
 211         ZERO_STRUCTP(ec->es->s.gss_state);
 212         ec->es->s.gss_state->creds = srv_cred;
 213
 214         /* No context yet. */
 215         ec->es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT;
 216
 217         return NT_STATUS_OK;
 218 }
 219 #endif
 220
 221 /******************************************************************************
 222  Shutdown a server encryption context.
 223 ******************************************************************************/
 224
 225 static void srv_free_encryption_context(struct smb_srv_trans_enc_ctx **pp_ec)
 226 {
 227         struct smb_srv_trans_enc_ctx *ec = *pp_ec;
 228
 229         if (!ec) {
 230                 return;
 231         }
 232
 233         if (ec->es) {
 234                 switch (ec->es->smb_enc_type) {
 235                         case SMB_TRANS_ENC_NTLM:
 236                                 destroy_auth_ntlmssp(ec);
 237                                 break;
 238 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 239                         case SMB_TRANS_ENC_GSS:
 240                                 break;
 241 #endif
 242                 }
 243                 common_free_encryption_state(&ec->es);
 244         }
 245
 246         SAFE_FREE(ec);
 247         *pp_ec = NULL;
 248 }
 249
 250 /******************************************************************************
 251  Create a server encryption context.
 252 ******************************************************************************/
 253
 254 static NTSTATUS make_srv_encryption_context(enum smb_trans_enc_type smb_enc_type, struct smb_srv_trans_enc_ctx **pp_ec)
 255 {
 256         struct smb_srv_trans_enc_ctx *ec;
 257
 258         *pp_ec = NULL;
 259
 260         ec = SMB_MALLOC_P(struct smb_srv_trans_enc_ctx);
 261         if (!ec) {
 262                 return NT_STATUS_NO_MEMORY;
 263         }
 264         ZERO_STRUCTP(partial_srv_trans_enc_ctx);
 265         ec->es = SMB_MALLOC_P(struct smb_trans_enc_state);
 266         if (!ec->es) {
 267                 SAFE_FREE(ec);
 268                 return NT_STATUS_NO_MEMORY;
 269         }
 270         ZERO_STRUCTP(ec->es);
 271         ec->es->smb_enc_type = smb_enc_type;
 272         switch (smb_enc_type) {
 273                 case SMB_TRANS_ENC_NTLM:
 274                         {
 275                                 NTSTATUS status = make_auth_ntlmssp(ec);
 276                                 if (!NT_STATUS_IS_OK(status)) {
 277                                         srv_free_encryption_context(&ec);
 278                                         return status;
 279                                 }
 280                         }
 281                         break;
 282
 283 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 284                 case SMB_TRANS_ENC_GSS:
 285                         /* Acquire our credentials by calling gss_acquire_cred here. */
 286                         {
 287                                 NTSTATUS status = make_auth_gss(ec);
 288                                 if (!NT_STATUS_IS_OK(status)) {
 289                                         srv_free_encryption_context(&ec);
 290                                         return status;
 291                                 }
 292                         }
 293                         break;
 294 #endif
 295                 default:
 296                         srv_free_encryption_context(&ec);
 297                         return NT_STATUS_INVALID_PARAMETER;
 298         }
 299         *pp_ec = ec;
 300         return NT_STATUS_OK;
 301 }
 302
 303 /******************************************************************************
 304  Free an encryption-allocated buffer.
 305 ******************************************************************************/
 306
 307 void srv_free_enc_buffer(char *buf)
 308 {
 309         /* We know this is an smb buffer, and we
 310          * didn't malloc, only copy, for a keepalive,
 311          * so ignore non-session messages. */
 312
 313         if(CVAL(buf,0)) {
 314                 return;
 315         }
 316
 317         if (srv_trans_enc_ctx) {
 318                 common_free_enc_buffer(srv_trans_enc_ctx->es, buf);
 319         }
 320 }
 321
 322 /******************************************************************************
 323  Decrypt an incoming buffer.
 324 ******************************************************************************/
 325
 326 NTSTATUS srv_decrypt_buffer(char *buf)
 327 {
 328         /* Ignore non-session messages. */
 329         if(CVAL(buf,0)) {
 330                 return NT_STATUS_OK;
 331         }
 332
 333         if (srv_trans_enc_ctx) {
 334                 return common_decrypt_buffer(srv_trans_enc_ctx->es, buf);
 335         }
 336
 337         return NT_STATUS_OK;
 338 }
 339
 340 /******************************************************************************
 341  Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
 342 ******************************************************************************/
 343
 344 NTSTATUS srv_encrypt_buffer(char *buf, char **buf_out)
 345 {
 346         *buf_out = buf;
 347
 348         /* Ignore non-session messages. */
 349         if(CVAL(buf,0)) {
 350                 return NT_STATUS_OK;
 351         }
 352
 353         if (srv_trans_enc_ctx) {
 354                 return common_encrypt_buffer(srv_trans_enc_ctx->es, buf, buf_out);
 355         }
 356         /* Not encrypting. */
 357         return NT_STATUS_OK;
 358 }
 359
 360 /******************************************************************************
 361  Do the gss encryption negotiation. Parameters are in/out.
 362  Until success we do everything on the partial enc ctx.
 363 ******************************************************************************/
 364
 365 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 366 static NTSTATUS srv_enc_spnego_gss_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob)
 367 {
 368         OM_uint32 ret;
 369         OM_uint32 min;
 370         OM_uint32 flags = 0;
 371         gss_buffer_desc in_buf, out_buf;
 372         struct smb_tran_enc_state_gss *gss_state;
 373         DATA_BLOB auth_reply = data_blob_null;
 374         DATA_BLOB response = data_blob_null;
 375         NTSTATUS status;
 376
 377         if (!partial_srv_trans_enc_ctx) {
 378                 status = make_srv_encryption_context(SMB_TRANS_ENC_GSS, &partial_srv_trans_enc_ctx);
 379                 if (!NT_STATUS_IS_OK(status)) {
 380                         return status;
 381                 }
 382         }
 383
 384         gss_state = partial_srv_trans_enc_ctx->es->s.gss_state;
 385
 386         in_buf.value = secblob.data;
 387         in_buf.length = secblob.length;
 388
 389         out_buf.value = NULL;
 390         out_buf.length = 0;
 391
 392         become_root();
 393
 394         ret = gss_accept_sec_context(&min,
 395                                 &gss_state->gss_ctx,
 396                                 gss_state->creds,
 397                                 &in_buf,
 398                                 GSS_C_NO_CHANNEL_BINDINGS,
 399                                 NULL,
 400                                 NULL,           /* Ignore oids. */
 401                                 &out_buf,       /* To return. */
 402                                 &flags,
 403                                 NULL,           /* Ingore time. */
 404                                 NULL);          /* Ignore delegated creds. */
 405         unbecome_root();
 406
 407         status = gss_err_to_ntstatus(ret, min);
 408         if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
 409                 return status;
 410         }
 411
 412         /* Ensure we've got sign+seal available. */
 413         if (ret == GSS_S_COMPLETE) {
 414                 if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) !=
 415                                 (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) {
 416                         DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough "
 417                                 "for SMB sealing.\n"));
 418                         gss_release_buffer(&min, &out_buf);
 419                         return NT_STATUS_ACCESS_DENIED;
 420                 }
 421         }
 422
 423         auth_reply = data_blob(out_buf.value, out_buf.length);
 424         gss_release_buffer(&min, &out_buf);
 425
 426         /* Wrap in SPNEGO. */
 427         response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, OID_KERBEROS5);
 428         data_blob_free(&auth_reply);
 429
 430         SAFE_FREE(*ppdata);
 431         *ppdata = (unsigned char *)memdup(response.data, response.length);
 432         if ((*ppdata) == NULL && response.length > 0) {
 433                 status = NT_STATUS_NO_MEMORY;
 434         }
 435         *p_data_size = response.length;
 436
 437         data_blob_free(&response);
 438
 439         return status;
 440 }
 441 #endif
 442
 443 /******************************************************************************
 444  Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out.
 445  Until success we do everything on the partial enc ctx.
 446 ******************************************************************************/
 447
 448 static NTSTATUS srv_enc_ntlm_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob, bool spnego_wrap)
 449 {
 450         NTSTATUS status;
 451         DATA_BLOB chal = data_blob_null;
 452         DATA_BLOB response = data_blob_null;
 453
 454         status = make_srv_encryption_context(SMB_TRANS_ENC_NTLM, &partial_srv_trans_enc_ctx);
 455         if (!NT_STATUS_IS_OK(status)) {
 456                 return status;
 457         }
 458
 459         status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, secblob, &chal);
 460
 461         /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
 462          * for success ... */
 463
 464         if (spnego_wrap) {
 465                 response = spnego_gen_auth_response(talloc_tos(), &chal, status, OID_NTLMSSP);
 466                 data_blob_free(&chal);
 467         } else {
 468                 /* Return the raw blob. */
 469                 response = chal;
 470         }
 471
 472         SAFE_FREE(*ppdata);
 473         *ppdata = (unsigned char *)memdup(response.data, response.length);
 474         if ((*ppdata) == NULL && response.length > 0) {
 475                 status = NT_STATUS_NO_MEMORY;
 476         }
 477         *p_data_size = response.length;
 478         data_blob_free(&response);
 479
 480         return status;
 481 }
 482
 483 /******************************************************************************
 484  Do the SPNEGO encryption negotiation. Parameters are in/out.
 485  Based off code in smbd/sesssionsetup.c
 486  Until success we do everything on the partial enc ctx.
 487 ******************************************************************************/
 488
 489 static NTSTATUS srv_enc_spnego_negotiate(connection_struct *conn,
 490                                         unsigned char **ppdata,
 491                                         size_t *p_data_size,
 492                                         unsigned char **pparam,
 493                                         size_t *p_param_size)
 494 {
 495         NTSTATUS status;
 496         DATA_BLOB blob = data_blob_null;
 497         DATA_BLOB secblob = data_blob_null;
 498         char *kerb_mech = NULL;
 499
 500         blob = data_blob_const(*ppdata, *p_data_size);
 501
 502         status = parse_spnego_mechanisms(talloc_tos(), blob, &secblob, &kerb_mech);
 503         if (!NT_STATUS_IS_OK(status)) {
 504                 return nt_status_squash(status);
 505         }
 506
 507         /* We should have no partial context at this point. */
 508
 509         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 510
 511         if (kerb_mech) {
 512                 TALLOC_FREE(kerb_mech);
 513
 514 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 515                 status = srv_enc_spnego_gss_negotiate(ppdata, p_data_size, secblob);
 516 #else
 517                 /* Currently we don't SPNEGO negotiate
 518                  * back to NTLMSSP as we do in sessionsetupX. We should... */
 519                 return NT_STATUS_LOGON_FAILURE;
 520 #endif
 521         } else {
 522                 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, secblob, true);
 523         }
 524
 525         data_blob_free(&secblob);
 526
 527         if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 528                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 529                 return nt_status_squash(status);
 530         }
 531
 532         if (NT_STATUS_IS_OK(status)) {
 533                 /* Return the context we're using for this encryption state. */
 534                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 535                         return NT_STATUS_NO_MEMORY;
 536                 }
 537                 SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
 538                 *p_param_size = 2;
 539         }
 540
 541         return status;
 542 }
 543
 544 /******************************************************************************
 545  Complete a SPNEGO encryption negotiation. Parameters are in/out.
 546  We only get this for a NTLM auth second stage.
 547 ******************************************************************************/
 548
 549 static NTSTATUS srv_enc_spnego_ntlm_auth(connection_struct *conn,
 550                                         unsigned char **ppdata,
 551                                         size_t *p_data_size,
 552                                         unsigned char **pparam,
 553                                         size_t *p_param_size)
 554 {
 555         NTSTATUS status;
 556         DATA_BLOB blob = data_blob_null;
 557         DATA_BLOB auth = data_blob_null;
 558         DATA_BLOB auth_reply = data_blob_null;
 559         DATA_BLOB response = data_blob_null;
 560         struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
 561
 562         /* We must have a partial context here. */
 563
 564         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 565                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 566                 return NT_STATUS_INVALID_PARAMETER;
 567         }
 568
 569         blob = data_blob_const(*ppdata, *p_data_size);
 570         if (!spnego_parse_auth(talloc_tos(), blob, &auth)) {
 571                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 572                 return NT_STATUS_INVALID_PARAMETER;
 573         }
 574
 575         status = auth_ntlmssp_update(ec->auth_ntlmssp_state, auth, &auth_reply);
 576         data_blob_free(&auth);
 577
 578         /* From RFC4178.
 579          *
 580          *    supportedMech
 581          *
 582          *          This field SHALL only be present in the first reply from the
 583          *                target.
 584          * So set mechOID to NULL here.
 585          */
 586
 587         response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, NULL);
 588         data_blob_free(&auth_reply);
 589
 590         if (NT_STATUS_IS_OK(status)) {
 591                 /* Return the context we're using for this encryption state. */
 592                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 593                         return NT_STATUS_NO_MEMORY;
 594                 }
 595                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 596                 *p_param_size = 2;
 597         }
 598
 599         SAFE_FREE(*ppdata);
 600         *ppdata = (unsigned char *)memdup(response.data, response.length);
 601         if ((*ppdata) == NULL && response.length > 0)
 602                 return NT_STATUS_NO_MEMORY;
 603         *p_data_size = response.length;
 604         data_blob_free(&response);
 605         return status;
 606 }
 607
 608 /******************************************************************************
 609  Raw NTLM encryption negotiation. Parameters are in/out.
 610  This function does both steps.
 611 ******************************************************************************/
 612
 613 static NTSTATUS srv_enc_raw_ntlm_auth(connection_struct *conn,
 614                                         unsigned char **ppdata,
 615                                         size_t *p_data_size,
 616                                         unsigned char **pparam,
 617                                         size_t *p_param_size)
 618 {
 619         NTSTATUS status;
 620         DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
 621         DATA_BLOB response = data_blob_null;
 622         struct smb_srv_trans_enc_ctx *ec;
 623
 624         if (!partial_srv_trans_enc_ctx) {
 625                 /* This is the initial step. */
 626                 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, blob, false);
 627                 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 628                         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 629                         return nt_status_squash(status);
 630                 }
 631                 return status;
 632         }
 633
 634         ec = partial_srv_trans_enc_ctx;
 635         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 636                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 637                 return NT_STATUS_INVALID_PARAMETER;
 638         }
 639
 640         /* Second step. */
 641         status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, blob, &response);
 642
 643         if (NT_STATUS_IS_OK(status)) {
 644                 /* Return the context we're using for this encryption state. */
 645                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 646                         return NT_STATUS_NO_MEMORY;
 647                 }
 648                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 649                 *p_param_size = 2;
 650         }
 651
 652         /* Return the raw blob. */
 653         SAFE_FREE(*ppdata);
 654         *ppdata = (unsigned char *)memdup(response.data, response.length);
 655         if ((*ppdata) == NULL && response.length > 0)
 656                 return NT_STATUS_NO_MEMORY;
 657         *p_data_size = response.length;
 658         data_blob_free(&response);
 659         return status;
 660 }
 661
 662 /******************************************************************************
 663  Do the SPNEGO encryption negotiation. Parameters are in/out.
 664 ******************************************************************************/
 665
 666 NTSTATUS srv_request_encryption_setup(connection_struct *conn,
 667                                         unsigned char **ppdata,
 668                                         size_t *p_data_size,
 669                                         unsigned char **pparam,
 670                                         size_t *p_param_size)
 671 {
 672         unsigned char *pdata = *ppdata;
 673
 674         SAFE_FREE(*pparam);
 675         *p_param_size = 0;
 676
 677         if (*p_data_size < 1) {
 678                 return NT_STATUS_INVALID_PARAMETER;
 679         }
 680
 681         if (pdata[0] == ASN1_APPLICATION(0)) {
 682                 /* its a negTokenTarg packet */
 683                 return srv_enc_spnego_negotiate(conn, ppdata, p_data_size, pparam, p_param_size);
 684         }
 685
 686         if (pdata[0] == ASN1_CONTEXT(1)) {
 687                 /* It's an auth packet */
 688                 return srv_enc_spnego_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 689         }
 690
 691         /* Maybe it's a raw unwrapped auth ? */
 692         if (*p_data_size < 7) {
 693                 return NT_STATUS_INVALID_PARAMETER;
 694         }
 695
 696         if (strncmp((char *)pdata, "NTLMSSP", 7) == 0) {
 697                 return srv_enc_raw_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 698         }
 699
 700         DEBUG(1,("srv_request_encryption_setup: Unknown packet\n"));
 701
 702         return NT_STATUS_LOGON_FAILURE;
 703 }
 704
 705 /******************************************************************************
 706  Negotiation was successful - turn on server-side encryption.
 707 ******************************************************************************/
 708
 709 static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
 710 {
 711         if (!ec || !ec->es) {
 712                 return NT_STATUS_LOGON_FAILURE;
 713         }
 714
 715         if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
 716                 if (!auth_ntlmssp_negotiated_sign((ec->auth_ntlmssp_state))) {
 717                         return NT_STATUS_INVALID_PARAMETER;
 718                 }
 719
 720                 if (!auth_ntlmssp_negotiated_seal((ec->auth_ntlmssp_state))) {
 721                         return NT_STATUS_INVALID_PARAMETER;
 722                 }
 723         }
 724         /* Todo - check gssapi case. */
 725
 726         return NT_STATUS_OK;
 727 }
 728
 729 /******************************************************************************
 730  Negotiation was successful - turn on server-side encryption.
 731 ******************************************************************************/
 732
 733 NTSTATUS srv_encryption_start(connection_struct *conn)
 734 {
 735         NTSTATUS status;
 736
 737         /* Check that we are really doing sign+seal. */
 738         status = check_enc_good(partial_srv_trans_enc_ctx);
 739         if (!NT_STATUS_IS_OK(status)) {
 740                 return status;
 741         }
 742         /* Throw away the context we're using currently (if any). */
 743         srv_free_encryption_context(&srv_trans_enc_ctx);
 744
 745         /* Steal the partial pointer. Deliberate shallow copy. */
 746         srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
 747         srv_trans_enc_ctx->es->enc_on = true;
 748
 749         partial_srv_trans_enc_ctx = NULL;
 750
 751         DEBUG(1,("srv_encryption_start: context negotiated\n"));
 752         return NT_STATUS_OK;
 753 }
 754
 755 /******************************************************************************
 756  Shutdown all server contexts.
 757 ******************************************************************************/
 758
 759 void server_encryption_shutdown(void)
 760 {
 761         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 762         srv_free_encryption_context(&srv_trans_enc_ctx);
 763 }