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. */
  57         if(CVAL(inbuf,0)) {
  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         if (srv_trans_enc_ctx && enc_num == srv_enc_ctx()) {
  67                 return true;
  68         }
  69         return false;
  70 }
  71
  72 /******************************************************************************
  73  Create an auth_ntlmssp_state and ensure pointer copy is correct.
  74 ******************************************************************************/
  75
  76 static NTSTATUS make_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
  77 {
  78         NTSTATUS status = auth_ntlmssp_start(&ec->auth_ntlmssp_state);
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 return nt_status_squash(status);
  81         }
  82
  83         /*
  84          * We must remember to update the pointer copy for the common
  85          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
  86          */
  87         ec->es->s.ntlmssp_state = ec->auth_ntlmssp_state->ntlmssp_state;
  88         return status;
  89 }
  90
  91 /******************************************************************************
  92  Destroy an auth_ntlmssp_state and ensure pointer copy is correct.
  93 ******************************************************************************/
  94
  95 static void destroy_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
  96 {
  97         /*
  98          * We must remember to update the pointer copy for the common
  99          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
 100          */
 101
 102         if (ec->auth_ntlmssp_state) {
 103                 auth_ntlmssp_end(&ec->auth_ntlmssp_state);
 104                 /* The auth_ntlmssp_end killed this already. */
 105                 ec->es->s.ntlmssp_state = NULL;
 106         }
 107 }
 108
 109 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 110
 111 /******************************************************************************
 112  Import a name.
 113 ******************************************************************************/
 114
 115 static NTSTATUS get_srv_gss_creds(const char *service,
 116                                 const char *name,
 117                                 gss_cred_usage_t cred_type,
 118                                 gss_cred_id_t *p_srv_cred)
 119 {
 120         OM_uint32 ret;
 121         OM_uint32 min;
 122         gss_name_t srv_name;
 123         gss_buffer_desc input_name;
 124         char *host_princ_s = NULL;
 125         NTSTATUS status = NT_STATUS_OK;
 126
 127         gss_OID_desc nt_hostbased_service =
 128         {10, CONST_DISCARD(char *,"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
 129
 130         asprintf(&host_princ_s, "%s@%s", service, name);
 131         if (host_princ_s == NULL) {
 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         bool got_kerberos_mechanism = false;
 486
 487         blob = data_blob_const(*ppdata, *p_data_size);
 488
 489         status = parse_spnego_mechanisms(blob, &secblob, &got_kerberos_mechanism);
 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 defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 499         if (got_kerberos_mechanism && lp_use_kerberos_keytab() ) {
 500                 status = srv_enc_spnego_gss_negotiate(ppdata, p_data_size, secblob);
 501         } else
 502 #endif
 503         {
 504                 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, secblob, true);
 505         }
 506
 507         data_blob_free(&secblob);
 508
 509         if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 510                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 511                 return nt_status_squash(status);
 512         }
 513
 514         if (NT_STATUS_IS_OK(status)) {
 515                 /* Return the context we're using for this encryption state. */
 516                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 517                         return NT_STATUS_NO_MEMORY;
 518                 }
 519                 SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
 520                 *p_param_size = 2;
 521         }
 522
 523         return status;
 524 }
 525
 526 /******************************************************************************
 527  Complete a SPNEGO encryption negotiation. Parameters are in/out.
 528  We only get this for a NTLM auth second stage.
 529 ******************************************************************************/
 530
 531 static NTSTATUS srv_enc_spnego_ntlm_auth(connection_struct *conn,
 532                                         unsigned char **ppdata,
 533                                         size_t *p_data_size,
 534                                         unsigned char **pparam,
 535                                         size_t *p_param_size)
 536 {
 537         NTSTATUS status;
 538         DATA_BLOB blob = data_blob_null;
 539         DATA_BLOB auth = data_blob_null;
 540         DATA_BLOB auth_reply = data_blob_null;
 541         DATA_BLOB response = data_blob_null;
 542         struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
 543
 544         /* We must have a partial context here. */
 545
 546         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 547                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 548                 return NT_STATUS_INVALID_PARAMETER;
 549         }
 550
 551         blob = data_blob_const(*ppdata, *p_data_size);
 552         if (!spnego_parse_auth(blob, &auth)) {
 553                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 554                 return NT_STATUS_INVALID_PARAMETER;
 555         }
 556
 557         status = auth_ntlmssp_update(ec->auth_ntlmssp_state, auth, &auth_reply);
 558         data_blob_free(&auth);
 559
 560         response = spnego_gen_auth_response(&auth_reply, status, OID_NTLMSSP);
 561         data_blob_free(&auth_reply);
 562
 563         if (NT_STATUS_IS_OK(status)) {
 564                 /* Return the context we're using for this encryption state. */
 565                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 566                         return NT_STATUS_NO_MEMORY;
 567                 }
 568                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 569                 *p_param_size = 2;
 570         }
 571
 572         SAFE_FREE(*ppdata);
 573         *ppdata = response.data;
 574         *p_data_size = response.length;
 575         return status;
 576 }
 577
 578 /******************************************************************************
 579  Raw NTLM encryption negotiation. Parameters are in/out.
 580  This function does both steps.
 581 ******************************************************************************/
 582
 583 static NTSTATUS srv_enc_raw_ntlm_auth(connection_struct *conn,
 584                                         unsigned char **ppdata,
 585                                         size_t *p_data_size,
 586                                         unsigned char **pparam,
 587                                         size_t *p_param_size)
 588 {
 589         NTSTATUS status;
 590         DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
 591         DATA_BLOB response = data_blob_null;
 592         struct smb_srv_trans_enc_ctx *ec;
 593
 594         if (!partial_srv_trans_enc_ctx) {
 595                 /* This is the initial step. */
 596                 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, blob, false);
 597                 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 598                         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 599                         return nt_status_squash(status);
 600                 }
 601                 return status;
 602         }
 603
 604         ec = partial_srv_trans_enc_ctx;
 605         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 606                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 607                 return NT_STATUS_INVALID_PARAMETER;
 608         }
 609
 610         /* Second step. */
 611         status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, blob, &response);
 612
 613         if (NT_STATUS_IS_OK(status)) {
 614                 /* Return the context we're using for this encryption state. */
 615                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 616                         return NT_STATUS_NO_MEMORY;
 617                 }
 618                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 619                 *p_param_size = 2;
 620         }
 621
 622         /* Return the raw blob. */
 623         SAFE_FREE(*ppdata);
 624         *ppdata = response.data;
 625         *p_data_size = response.length;
 626         return status;
 627 }
 628
 629 /******************************************************************************
 630  Do the SPNEGO encryption negotiation. Parameters are in/out.
 631 ******************************************************************************/
 632
 633 NTSTATUS srv_request_encryption_setup(connection_struct *conn,
 634                                         unsigned char **ppdata,
 635                                         size_t *p_data_size,
 636                                         unsigned char **pparam,
 637                                         size_t *p_param_size)
 638 {
 639         unsigned char *pdata = *ppdata;
 640
 641         SAFE_FREE(*pparam);
 642         *p_param_size = 0;
 643
 644         if (*p_data_size < 1) {
 645                 return NT_STATUS_INVALID_PARAMETER;
 646         }
 647
 648         if (pdata[0] == ASN1_APPLICATION(0)) {
 649                 /* its a negTokenTarg packet */
 650                 return srv_enc_spnego_negotiate(conn, ppdata, p_data_size, pparam, p_param_size);
 651         }
 652
 653         if (pdata[0] == ASN1_CONTEXT(1)) {
 654                 /* It's an auth packet */
 655                 return srv_enc_spnego_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 656         }
 657
 658         /* Maybe it's a raw unwrapped auth ? */
 659         if (*p_data_size < 7) {
 660                 return NT_STATUS_INVALID_PARAMETER;
 661         }
 662
 663         if (strncmp((char *)pdata, "NTLMSSP", 7) == 0) {
 664                 return srv_enc_raw_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 665         }
 666
 667         DEBUG(1,("srv_request_encryption_setup: Unknown packet\n"));
 668
 669         return NT_STATUS_LOGON_FAILURE;
 670 }
 671
 672 /******************************************************************************
 673  Negotiation was successful - turn on server-side encryption.
 674 ******************************************************************************/
 675
 676 static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
 677 {
 678         if (!ec || !ec->es) {
 679                 return NT_STATUS_LOGON_FAILURE;
 680         }
 681
 682         if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
 683                 if ((ec->es->s.ntlmssp_state->neg_flags & (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) !=
 684                                 (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) {
 685                         return NT_STATUS_INVALID_PARAMETER;
 686                 }
 687         }
 688         /* Todo - check gssapi case. */
 689
 690         return NT_STATUS_OK;
 691 }
 692
 693 /******************************************************************************
 694  Negotiation was successful - turn on server-side encryption.
 695 ******************************************************************************/
 696
 697 NTSTATUS srv_encryption_start(connection_struct *conn)
 698 {
 699         NTSTATUS status;
 700
 701         /* Check that we are really doing sign+seal. */
 702         status = check_enc_good(partial_srv_trans_enc_ctx);
 703         if (!NT_STATUS_IS_OK(status)) {
 704                 return status;
 705         }
 706         /* Throw away the context we're using currently (if any). */
 707         srv_free_encryption_context(&srv_trans_enc_ctx);
 708
 709         /* Steal the partial pointer. Deliberate shallow copy. */
 710         srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
 711         srv_trans_enc_ctx->es->enc_on = true;
 712
 713         partial_srv_trans_enc_ctx = NULL;
 714
 715         return NT_STATUS_OK;
 716 }
 717
 718 /******************************************************************************
 719  Shutdown all server contexts.
 720 ******************************************************************************/
 721
 722 void server_encryption_shutdown(void)
 723 {
 724         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 725         srv_free_encryption_context(&srv_trans_enc_ctx);
 726 }