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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 /******************************************************************************
  24  Server side encryption.
  25 ******************************************************************************/
  26
  27 /******************************************************************************
  28  Global server state.
  29 ******************************************************************************/
  30
  31 struct smb_srv_trans_enc_ctx {
  32         struct smb_trans_enc_state *es;
  33         AUTH_NTLMSSP_STATE *auth_ntlmssp_state; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
  34 };
  35
  36 static struct smb_srv_trans_enc_ctx *partial_srv_trans_enc_ctx;
  37 static struct smb_srv_trans_enc_ctx *srv_trans_enc_ctx;
  38
  39 /******************************************************************************
  40  Is server encryption on ?
  41 ******************************************************************************/
  42
  43 BOOL srv_encryption_on(void)
  44 {
  45         if (srv_trans_enc_ctx) {
  46                 return common_encryption_on(srv_trans_enc_ctx->es);
  47         }
  48         return False;
  49 }
  50
  51 /******************************************************************************
  52  Create an auth_ntlmssp_state and ensure pointer copy is correct.
  53 ******************************************************************************/
  54
  55 static NTSTATUS make_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
  56 {
  57         NTSTATUS status = auth_ntlmssp_start(&ec->auth_ntlmssp_state);
  58         if (!NT_STATUS_IS_OK(status)) {
  59                 return nt_status_squash(status);
  60         }
  61
  62         /*
  63          * We must remember to update the pointer copy for the common
  64          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
  65          */
  66         ec->es->s.ntlmssp_state = ec->auth_ntlmssp_state->ntlmssp_state;
  67         return status;
  68 }
  69
  70 /******************************************************************************
  71  Destroy an auth_ntlmssp_state and ensure pointer copy is correct.
  72 ******************************************************************************/
  73
  74 static void destroy_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
  75 {
  76         /*
  77          * We must remember to update the pointer copy for the common
  78          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
  79          */
  80
  81         if (ec->auth_ntlmssp_state) {
  82                 auth_ntlmssp_end(&ec->auth_ntlmssp_state);
  83                 /* The auth_ntlmssp_end killed this already. */
  84                 ec->es->s.ntlmssp_state = NULL;
  85         }
  86 }
  87
  88 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
  89
  90 /******************************************************************************
  91  Import a name.
  92 ******************************************************************************/
  93
  94 static NTSTATUS get_srv_gss_creds(const char *service,
  95                                 const char *name,
  96                                 gss_cred_usage_t cred_type,
  97                                 gss_cred_id_t *p_srv_cred)
  98 {
  99         OM_uint32 ret;
 100         OM_uint32 min;
 101         gss_name_t srv_name;
 102         gss_buffer_desc input_name;
 103         char *host_princ_s = NULL;
 104         NTSTATUS status = NT_STATUS_OK;
 105
 106         gss_OID_desc nt_hostbased_service =
 107         {10, CONST_DISCARD(char *,"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
 108
 109         asprintf(&host_princ_s, "%s@%s", service, name);
 110         if (host_princ_s == NULL) {
 111                 return NT_STATUS_NO_MEMORY;
 112         }
 113
 114         input_name.value = host_princ_s;
 115         input_name.length = strlen(host_princ_s) + 1;
 116
 117         ret = gss_import_name(&min,
 118                                 &input_name,
 119                                 &nt_hostbased_service,
 120                                 &srv_name);
 121
 122         if (ret != GSS_S_COMPLETE) {
 123                 SAFE_FREE(host_princ_s);
 124                 return map_nt_error_from_gss(ret, min);
 125         }
 126
 127         ret = gss_acquire_cred(&min,
 128                                 &srv_name,
 129                                 GSS_C_INDEFINITE,
 130                                 GSS_C_NULL_OID_SET,
 131                                 cred_type,
 132                                 p_srv_cred,
 133                                 NULL,
 134                                 NULL);
 135
 136         if (ret != GSS_S_COMPLETE) {
 137                 status = map_nt_error_from_gss(ret, min);
 138         }
 139
 140         SAFE_FREE(host_princ_s);
 141         gss_release_name(&min, &srv_name);
 142         return status;
 143 }
 144
 145 /******************************************************************************
 146  Create a gss state.
 147  Try and get the cifs/server@realm principal first, then fall back to
 148  host/server@realm.
 149 ******************************************************************************/
 150
 151 static NTSTATUS make_auth_gss(struct smb_srv_trans_enc_ctx *ec)
 152 {
 153         NTSTATUS status;
 154         gss_cred_id_t srv_cred;
 155         fstring fqdn;
 156
 157         name_to_fqdn(fqdn, global_myname());
 158         strlower_m(fqdn);
 159
 160         status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
 161         if (!NT_STATUS_IS_OK(status)) {
 162                 status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred);
 163                 if (!NT_STATUS_IS_OK(status)) {
 164                         return nt_status_squash(status);
 165                 }
 166         }
 167
 168         ec->es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss);
 169         if (!ec->es->s.gss_state) {
 170                 OM_uint32 min;
 171                 gss_release_cred(&min, &srv_cred);
 172                 return NT_STATUS_NO_MEMORY;
 173         }
 174         ZERO_STRUCTP(ec->es->s.gss_state);
 175         ec->es->s.gss_state->creds = srv_cred;
 176
 177         /* No context yet. */
 178         ec->es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT;
 179
 180         return NT_STATUS_OK;
 181 }
 182 #endif
 183
 184 /******************************************************************************
 185  Shutdown a server encryption context.
 186 ******************************************************************************/
 187
 188 static void srv_free_encryption_context(struct smb_srv_trans_enc_ctx **pp_ec)
 189 {
 190         struct smb_srv_trans_enc_ctx *ec = *pp_ec;
 191
 192         if (!ec) {
 193                 return;
 194         }
 195
 196         if (ec->es) {
 197                 switch (ec->es->smb_enc_type) {
 198                         case SMB_TRANS_ENC_NTLM:
 199                                 destroy_auth_ntlmssp(ec);
 200                                 break;
 201 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 202                         case SMB_TRANS_ENC_GSS:
 203                                 break;
 204 #endif
 205                 }
 206                 common_free_encryption_state(&ec->es);
 207         }
 208
 209         SAFE_FREE(ec);
 210         *pp_ec = NULL;
 211 }
 212
 213 /******************************************************************************
 214  Create a server encryption context.
 215 ******************************************************************************/
 216
 217 static NTSTATUS make_srv_encryption_context(enum smb_trans_enc_type smb_enc_type, struct smb_srv_trans_enc_ctx **pp_ec)
 218 {
 219         struct smb_srv_trans_enc_ctx *ec;
 220
 221         *pp_ec = NULL;
 222
 223         ec = SMB_MALLOC_P(struct smb_srv_trans_enc_ctx);
 224         if (!ec) {
 225                 return NT_STATUS_NO_MEMORY;
 226         }
 227         ZERO_STRUCTP(partial_srv_trans_enc_ctx);
 228         ec->es = SMB_MALLOC_P(struct smb_trans_enc_state);
 229         if (!ec->es) {
 230                 SAFE_FREE(ec);
 231                 return NT_STATUS_NO_MEMORY;
 232         }
 233         ZERO_STRUCTP(ec->es);
 234         ec->es->smb_enc_type = smb_enc_type;
 235         switch (smb_enc_type) {
 236                 case SMB_TRANS_ENC_NTLM:
 237                         {
 238                                 NTSTATUS status = make_auth_ntlmssp(ec);
 239                                 if (!NT_STATUS_IS_OK(status)) {
 240                                         srv_free_encryption_context(&ec);
 241                                         return status;
 242                                 }
 243                         }
 244                         break;
 245
 246 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 247                 case SMB_TRANS_ENC_GSS:
 248                         /* Acquire our credentials by calling gss_acquire_cred here. */
 249                         {
 250                                 NTSTATUS status = make_auth_gss(ec);
 251                                 if (!NT_STATUS_IS_OK(status)) {
 252                                         srv_free_encryption_context(&ec);
 253                                         return status;
 254                                 }
 255                         }
 256                         break;
 257 #endif
 258                 default:
 259                         srv_free_encryption_context(&ec);
 260                         return NT_STATUS_INVALID_PARAMETER;
 261         }
 262         *pp_ec = ec;
 263         return NT_STATUS_OK;
 264 }
 265
 266 /******************************************************************************
 267  Free an encryption-allocated buffer.
 268 ******************************************************************************/
 269
 270 void srv_free_enc_buffer(char *buf)
 271 {
 272         /* We know this is an smb buffer, and we
 273          * didn't malloc, only copy, for a keepalive,
 274          * so ignore session keepalives. */
 275
 276         if(CVAL(buf,0) == SMBkeepalive) {
 277                 return;
 278         }
 279
 280         if (srv_trans_enc_ctx) {
 281                 common_free_enc_buffer(srv_trans_enc_ctx->es, buf);
 282         }
 283 }
 284
 285 /******************************************************************************
 286  Decrypt an incoming buffer.
 287 ******************************************************************************/
 288
 289 NTSTATUS srv_decrypt_buffer(char *buf)
 290 {
 291         /* Ignore session keepalives. */
 292         if(CVAL(buf,0) == SMBkeepalive) {
 293                 return NT_STATUS_OK;
 294         }
 295
 296         if (srv_trans_enc_ctx) {
 297                 return common_decrypt_buffer(srv_trans_enc_ctx->es, buf);
 298         }
 299
 300         return NT_STATUS_OK;
 301 }
 302
 303 /******************************************************************************
 304  Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
 305 ******************************************************************************/
 306
 307 NTSTATUS srv_encrypt_buffer(char *buf, char **buf_out)
 308 {
 309         *buf_out = buf;
 310
 311         /* Ignore session keepalives. */
 312         if(CVAL(buf,0) == SMBkeepalive) {
 313                 return NT_STATUS_OK;
 314         }
 315
 316         if (srv_trans_enc_ctx) {
 317                 return common_encrypt_buffer(srv_trans_enc_ctx->es, buf, buf_out);
 318         }
 319         /* Not encrypting. */
 320         return NT_STATUS_OK;
 321 }
 322
 323 /******************************************************************************
 324  Do the gss encryption negotiation. Parameters are in/out.
 325  Until success we do everything on the partial enc ctx.
 326 ******************************************************************************/
 327
 328 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 329 static NTSTATUS srv_enc_spnego_gss_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob)
 330 {
 331         OM_uint32 ret;
 332         OM_uint32 min;
 333         OM_uint32 flags = 0;
 334         gss_buffer_desc in_buf, out_buf;
 335         struct smb_tran_enc_state_gss *gss_state;
 336         DATA_BLOB auth_reply = data_blob(NULL,0);
 337         DATA_BLOB response = data_blob(NULL,0);
 338         NTSTATUS status;
 339
 340         if (!partial_srv_trans_enc_ctx) {
 341                 status = make_srv_encryption_context(SMB_TRANS_ENC_GSS, &partial_srv_trans_enc_ctx);
 342                 if (!NT_STATUS_IS_OK(status)) {
 343                         return status;
 344                 }
 345         }
 346
 347         gss_state = partial_srv_trans_enc_ctx->es->s.gss_state;
 348
 349         in_buf.value = secblob.data;
 350         in_buf.length = secblob.length;
 351
 352         out_buf.value = NULL;
 353         out_buf.length = 0;
 354
 355         ret = gss_accept_sec_context(&min,
 356                                 &gss_state->gss_ctx,
 357                                 gss_state->creds,
 358                                 &in_buf,
 359                                 GSS_C_NO_CHANNEL_BINDINGS,
 360                                 NULL,
 361                                 NULL,           /* Ignore oids. */
 362                                 &out_buf,       /* To return. */
 363                                 &flags,
 364                                 NULL,           /* Ingore time. */
 365                                 NULL);          /* Ignore delegated creds. */
 366
 367         status = gss_err_to_ntstatus(ret, min);
 368         if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
 369                 return status;
 370         }
 371
 372         /* Ensure we've got sign+seal available. */
 373         if (ret == GSS_S_COMPLETE) {
 374                 if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) !=
 375                                 (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) {
 376                         DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough "
 377                                 "for SMB sealing.\n"));
 378                         gss_release_buffer(&min, &out_buf);
 379                         return NT_STATUS_ACCESS_DENIED;
 380                 }
 381         }
 382
 383         auth_reply = data_blob(out_buf.value, out_buf.length);
 384         gss_release_buffer(&min, &out_buf);
 385
 386         /* Wrap in SPNEGO. */
 387         response = spnego_gen_auth_response(&auth_reply, status, OID_KERBEROS5);
 388         data_blob_free(&auth_reply);
 389
 390         SAFE_FREE(*ppdata);
 391         *ppdata = response.data;
 392         *p_data_size = response.length;
 393
 394         return status;
 395 }
 396 #endif
 397
 398 /******************************************************************************
 399  Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out.
 400  Until success we do everything on the partial enc ctx.
 401 ******************************************************************************/
 402
 403 static NTSTATUS srv_enc_ntlm_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob, BOOL spnego_wrap)
 404 {
 405         NTSTATUS status;
 406         DATA_BLOB chal = data_blob(NULL, 0);
 407         DATA_BLOB response = data_blob(NULL, 0);
 408
 409         status = make_srv_encryption_context(SMB_TRANS_ENC_NTLM, &partial_srv_trans_enc_ctx);
 410         if (!NT_STATUS_IS_OK(status)) {
 411                 return status;
 412         }
 413
 414         status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, secblob, &chal);
 415
 416         /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
 417          * for success ... */
 418
 419         if (spnego_wrap) {
 420                 response = spnego_gen_auth_response(&chal, status, OID_NTLMSSP);
 421                 data_blob_free(&chal);
 422         } else {
 423                 /* Return the raw blob. */
 424                 response = chal;
 425         }
 426
 427         SAFE_FREE(*ppdata);
 428         *ppdata = response.data;
 429         *p_data_size = response.length;
 430         return status;
 431 }
 432
 433 /******************************************************************************
 434  Do the SPNEGO encryption negotiation. Parameters are in/out.
 435  Based off code in smbd/sesssionsetup.c
 436  Until success we do everything on the partial enc ctx.
 437 ******************************************************************************/
 438
 439 static NTSTATUS srv_enc_spnego_negotiate(connection_struct *conn,
 440                                         unsigned char **ppdata,
 441                                         size_t *p_data_size,
 442                                         unsigned char **pparam,
 443                                         size_t *p_param_size)
 444 {
 445         NTSTATUS status;
 446         DATA_BLOB blob = data_blob(NULL,0);
 447         DATA_BLOB secblob = data_blob(NULL, 0);
 448         BOOL got_kerberos_mechanism = False;
 449
 450         blob = data_blob_const(*ppdata, *p_data_size);
 451
 452         status = parse_spnego_mechanisms(blob, &secblob, &got_kerberos_mechanism);
 453         if (!NT_STATUS_IS_OK(status)) {
 454                 return nt_status_squash(status);
 455         }
 456
 457         /* We should have no partial context at this point. */
 458
 459         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 460
 461 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 462         if (got_kerberos_mechanism && lp_use_kerberos_keytab() ) {
 463                 status = srv_enc_spnego_gss_negotiate(ppdata, p_data_size, secblob);
 464         } else
 465 #endif
 466         {
 467                 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, secblob, True);
 468         }
 469
 470         data_blob_free(&secblob);
 471
 472         if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 473                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 474                 return nt_status_squash(status);
 475         }
 476
 477         if (NT_STATUS_IS_OK(status)) {
 478                 /* Return the context we're using for this encryption state. */
 479                 *pparam = SMB_MALLOC(2);
 480                 if (!*pparam) {
 481                         return NT_STATUS_NO_MEMORY;
 482                 }
 483                 SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
 484                 *p_param_size = 2;
 485         }
 486
 487         return status;
 488 }
 489
 490 /******************************************************************************
 491  Complete a SPNEGO encryption negotiation. Parameters are in/out.
 492  We only get this for a NTLM auth second stage.
 493 ******************************************************************************/
 494
 495 static NTSTATUS srv_enc_spnego_ntlm_auth(connection_struct *conn,
 496                                         unsigned char **ppdata,
 497                                         size_t *p_data_size,
 498                                         unsigned char **pparam,
 499                                         size_t *p_param_size)
 500 {
 501         NTSTATUS status;
 502         DATA_BLOB blob = data_blob(NULL,0);
 503         DATA_BLOB auth = data_blob(NULL,0);
 504         DATA_BLOB auth_reply = data_blob(NULL,0);
 505         DATA_BLOB response = data_blob(NULL,0);
 506         struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
 507
 508         /* We must have a partial context here. */
 509
 510         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 511                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 512                 return NT_STATUS_INVALID_PARAMETER;
 513         }
 514
 515         blob = data_blob_const(*ppdata, *p_data_size);
 516         if (!spnego_parse_auth(blob, &auth)) {
 517                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 518                 return NT_STATUS_INVALID_PARAMETER;
 519         }
 520
 521         status = auth_ntlmssp_update(ec->auth_ntlmssp_state, auth, &auth_reply);
 522         data_blob_free(&auth);
 523
 524         response = spnego_gen_auth_response(&auth_reply, status, OID_NTLMSSP);
 525         data_blob_free(&auth_reply);
 526
 527         if (NT_STATUS_IS_OK(status)) {
 528                 /* Return the context we're using for this encryption state. */
 529                 *pparam = SMB_MALLOC(2);
 530                 if (!*pparam) {
 531                         return NT_STATUS_NO_MEMORY;
 532                 }
 533                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 534                 *p_param_size = 2;
 535         }
 536
 537         SAFE_FREE(*ppdata);
 538         *ppdata = response.data;
 539         *p_data_size = response.length;
 540         return status;
 541 }
 542
 543 /******************************************************************************
 544  Raw NTLM encryption negotiation. Parameters are in/out.
 545  This function does both steps.
 546 ******************************************************************************/
 547
 548 static NTSTATUS srv_enc_raw_ntlm_auth(connection_struct *conn,
 549                                         unsigned char **ppdata,
 550                                         size_t *p_data_size,
 551                                         unsigned char **pparam,
 552                                         size_t *p_param_size)
 553 {
 554         NTSTATUS status;
 555         DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
 556         DATA_BLOB response = data_blob(NULL,0);
 557         struct smb_srv_trans_enc_ctx *ec;
 558
 559         if (!partial_srv_trans_enc_ctx) {
 560                 /* This is the initial step. */
 561                 status = srv_enc_ntlm_negotiate(ppdata, p_data_size, blob, False);
 562                 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 563                         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 564                         return nt_status_squash(status);
 565                 }
 566                 return status;
 567         }
 568
 569         ec = partial_srv_trans_enc_ctx;
 570         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 571                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 572                 return NT_STATUS_INVALID_PARAMETER;
 573         }
 574
 575         /* Second step. */
 576         status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, blob, &response);
 577
 578         if (NT_STATUS_IS_OK(status)) {
 579                 /* Return the context we're using for this encryption state. */
 580                 *pparam = SMB_MALLOC(2);
 581                 if (!*pparam) {
 582                         return NT_STATUS_NO_MEMORY;
 583                 }
 584                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 585                 *p_param_size = 2;
 586         }
 587
 588         /* Return the raw blob. */
 589         SAFE_FREE(*ppdata);
 590         *ppdata = response.data;
 591         *p_data_size = response.length;
 592         return status;
 593 }
 594
 595 /******************************************************************************
 596  Do the SPNEGO encryption negotiation. Parameters are in/out.
 597 ******************************************************************************/
 598
 599 NTSTATUS srv_request_encryption_setup(connection_struct *conn,
 600                                         unsigned char **ppdata,
 601                                         size_t *p_data_size,
 602                                         unsigned char **pparam,
 603                                         size_t *p_param_size)
 604 {
 605         unsigned char *pdata = *ppdata;
 606
 607         SAFE_FREE(*pparam);
 608         *p_param_size = 0;
 609
 610         if (*p_data_size < 1) {
 611                 return NT_STATUS_INVALID_PARAMETER;
 612         }
 613
 614         if (pdata[0] == ASN1_APPLICATION(0)) {
 615                 /* its a negTokenTarg packet */
 616                 return srv_enc_spnego_negotiate(conn, ppdata, p_data_size, pparam, p_param_size);
 617         }
 618
 619         if (pdata[0] == ASN1_CONTEXT(1)) {
 620                 /* It's an auth packet */
 621                 return srv_enc_spnego_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 622         }
 623
 624         /* Maybe it's a raw unwrapped auth ? */
 625         if (*p_data_size < 7) {
 626                 return NT_STATUS_INVALID_PARAMETER;
 627         }
 628
 629         if (strncmp((char *)pdata, "NTLMSSP", 7) == 0) {
 630                 return srv_enc_raw_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 631         }
 632
 633         DEBUG(1,("srv_request_encryption_setup: Unknown packet\n"));
 634
 635         return NT_STATUS_LOGON_FAILURE;
 636 }
 637
 638 /******************************************************************************
 639  Negotiation was successful - turn on server-side encryption.
 640 ******************************************************************************/
 641
 642 static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
 643 {
 644         if (!ec || !ec->es) {
 645                 return NT_STATUS_LOGON_FAILURE;
 646         }
 647
 648         if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
 649                 if ((ec->es->s.ntlmssp_state->neg_flags & (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) !=
 650                                 (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) {
 651                         return NT_STATUS_INVALID_PARAMETER;
 652                 }
 653         }
 654         /* Todo - check gssapi case. */
 655
 656         return NT_STATUS_OK;
 657 }
 658
 659 /******************************************************************************
 660  Negotiation was successful - turn on server-side encryption.
 661 ******************************************************************************/
 662
 663 NTSTATUS srv_encryption_start(connection_struct *conn)
 664 {
 665         NTSTATUS status;
 666
 667         /* Check that we are really doing sign+seal. */
 668         status = check_enc_good(partial_srv_trans_enc_ctx);
 669         if (!NT_STATUS_IS_OK(status)) {
 670                 return status;
 671         }
 672         /* Throw away the context we're using currently (if any). */
 673         srv_free_encryption_context(&srv_trans_enc_ctx);
 674
 675         /* Steal the partial pointer. Deliberate shallow copy. */
 676         srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
 677         srv_trans_enc_ctx->es->enc_on = True;
 678
 679         partial_srv_trans_enc_ctx = NULL;
 680         return NT_STATUS_OK;
 681 }
 682
 683 /******************************************************************************
 684  Shutdown all server contexts.
 685 ******************************************************************************/
 686
 687 void server_encryption_shutdown(void)
 688 {
 689         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 690         srv_free_encryption_context(&srv_trans_enc_ctx);
 691 }