source3/smbd/smb2_sesssetup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) Jeremy Allison 2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "../auth/gensec/gensec.h"
  27 #include "auth.h"
  28 #include "../lib/tsocket/tsocket.h"
  29 #include "../libcli/security/security.h"
  30 #include "../lib/util/tevent_ntstatus.h"
  31 #include "lib/crypto/sha512.h"
  32 #include "lib/crypto/aes.h"
  33 #include "lib/crypto/aes_ccm_128.h"
  34 #include "lib/crypto/aes_gcm_128.h"
  35
  36 static struct tevent_req *smbd_smb2_session_setup_wrap_send(TALLOC_CTX *mem_ctx,
  37                                         struct tevent_context *ev,
  38                                         struct smbd_smb2_request *smb2req,
  39                                         uint64_t in_session_id,
  40                                         uint8_t in_flags,
  41                                         uint8_t in_security_mode,
  42                                         uint64_t in_previous_session_id,
  43                                         DATA_BLOB in_security_buffer);
  44 static NTSTATUS smbd_smb2_session_setup_wrap_recv(struct tevent_req *req,
  45                                         uint16_t *out_session_flags,
  46                                         TALLOC_CTX *mem_ctx,
  47                                         DATA_BLOB *out_security_buffer,
  48                                         uint64_t *out_session_id);
  49
  50 static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq);
  51
  52 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
  53 {
  54         const uint8_t *inhdr;
  55         const uint8_t *inbody;
  56         uint64_t in_session_id;
  57         uint8_t in_flags;
  58         uint8_t in_security_mode;
  59         uint64_t in_previous_session_id;
  60         uint16_t in_security_offset;
  61         uint16_t in_security_length;
  62         DATA_BLOB in_security_buffer;
  63         NTSTATUS status;
  64         struct tevent_req *subreq;
  65
  66         status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
  67         if (!NT_STATUS_IS_OK(status)) {
  68                 return smbd_smb2_request_error(smb2req, status);
  69         }
  70         inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
  71         inbody = SMBD_SMB2_IN_BODY_PTR(smb2req);
  72
  73         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  74
  75         in_flags = CVAL(inbody, 0x02);
  76         in_security_mode = CVAL(inbody, 0x03);
  77         /* Capabilities = IVAL(inbody, 0x04) */
  78         /* Channel = IVAL(inbody, 0x08) */
  79         in_security_offset = SVAL(inbody, 0x0C);
  80         in_security_length = SVAL(inbody, 0x0E);
  81         in_previous_session_id = BVAL(inbody, 0x10);
  82
  83         if (in_security_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(smb2req))) {
  84                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  85         }
  86
  87         if (in_security_length > SMBD_SMB2_IN_DYN_LEN(smb2req)) {
  88                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  89         }
  90
  91         in_security_buffer.data = SMBD_SMB2_IN_DYN_PTR(smb2req);
  92         in_security_buffer.length = in_security_length;
  93
  94         subreq = smbd_smb2_session_setup_wrap_send(smb2req,
  95                                                    smb2req->sconn->ev_ctx,
  96                                                    smb2req,
  97                                                    in_session_id,
  98                                                    in_flags,
  99                                                    in_security_mode,
 100                                                    in_previous_session_id,
 101                                                    in_security_buffer);
 102         if (subreq == NULL) {
 103                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 104         }
 105         tevent_req_set_callback(subreq, smbd_smb2_request_sesssetup_done, smb2req);
 106
 107         return smbd_smb2_request_pending_queue(smb2req, subreq, 500);
 108 }
 109
 110 static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq)
 111 {
 112         struct smbd_smb2_request *smb2req =
 113                 tevent_req_callback_data(subreq,
 114                 struct smbd_smb2_request);
 115         uint8_t *outhdr;
 116         DATA_BLOB outbody;
 117         DATA_BLOB outdyn;
 118         uint16_t out_session_flags = 0;
 119         uint64_t out_session_id = 0;
 120         uint16_t out_security_offset;
 121         DATA_BLOB out_security_buffer = data_blob_null;
 122         NTSTATUS status;
 123         NTSTATUS error; /* transport error */
 124
 125         status = smbd_smb2_session_setup_wrap_recv(subreq,
 126                                                    &out_session_flags,
 127                                                    smb2req,
 128                                                    &out_security_buffer,
 129                                                    &out_session_id);
 130         TALLOC_FREE(subreq);
 131         if (!NT_STATUS_IS_OK(status) &&
 132             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 133                 status = nt_status_squash(status);
 134                 error = smbd_smb2_request_error(smb2req, status);
 135                 if (!NT_STATUS_IS_OK(error)) {
 136                         smbd_server_connection_terminate(smb2req->xconn,
 137                                                          nt_errstr(error));
 138                         return;
 139                 }
 140                 return;
 141         }
 142
 143         out_security_offset = SMB2_HDR_BODY + 0x08;
 144
 145         outhdr = SMBD_SMB2_OUT_HDR_PTR(smb2req);
 146
 147         outbody = smbd_smb2_generate_outbody(smb2req, 0x08);
 148         if (outbody.data == NULL) {
 149                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 150                 if (!NT_STATUS_IS_OK(error)) {
 151                         smbd_server_connection_terminate(smb2req->xconn,
 152                                                          nt_errstr(error));
 153                         return;
 154                 }
 155                 return;
 156         }
 157
 158         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 159
 160         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 161         SSVAL(outbody.data, 0x02,
 162               out_session_flags);               /* session flags */
 163         SSVAL(outbody.data, 0x04,
 164               out_security_offset);             /* security buffer offset */
 165         SSVAL(outbody.data, 0x06,
 166               out_security_buffer.length);      /* security buffer length */
 167
 168         outdyn = out_security_buffer;
 169
 170         error = smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 171                                            __location__);
 172         if (!NT_STATUS_IS_OK(error)) {
 173                 smbd_server_connection_terminate(smb2req->xconn,
 174                                                  nt_errstr(error));
 175                 return;
 176         }
 177 }
 178
 179 static NTSTATUS smbd_smb2_auth_generic_return(struct smbXsrv_session *session,
 180                                         struct smbXsrv_session_auth0 **_auth,
 181                                         struct smbd_smb2_request *smb2req,
 182                                         uint8_t in_security_mode,
 183                                         struct auth_session_info *session_info,
 184                                         uint16_t *out_session_flags,
 185                                         uint64_t *out_session_id)
 186 {
 187         NTSTATUS status;
 188         bool guest = false;
 189         uint8_t session_key[16];
 190         struct smbXsrv_session *x = session;
 191         struct smbXsrv_session_auth0 *auth = *_auth;
 192         struct smbXsrv_connection *xconn = smb2req->xconn;
 193         size_t i;
 194         struct _derivation {
 195                 DATA_BLOB label;
 196                 DATA_BLOB context;
 197         };
 198         struct {
 199                 struct _derivation signing;
 200                 struct _derivation encryption;
 201                 struct _derivation decryption;
 202                 struct _derivation application;
 203         } derivation = { };
 204
 205         *_auth = NULL;
 206
 207         if (xconn->protocol >= PROTOCOL_SMB3_10) {
 208                 struct smbXsrv_preauth *preauth;
 209                 struct _derivation *d;
 210                 DATA_BLOB p;
 211                 struct hc_sha512state sctx;
 212
 213                 preauth = talloc_move(smb2req, &auth->preauth);
 214
 215                 samba_SHA512_Init(&sctx);
 216                 samba_SHA512_Update(&sctx, preauth->sha512_value,
 217                                     sizeof(preauth->sha512_value));
 218                 for (i = 1; i < smb2req->in.vector_count; i++) {
 219                         samba_SHA512_Update(&sctx,
 220                                             smb2req->in.vector[i].iov_base,
 221                                             smb2req->in.vector[i].iov_len);
 222                 }
 223                 samba_SHA512_Final(preauth->sha512_value, &sctx);
 224
 225                 p = data_blob_const(preauth->sha512_value,
 226                                     sizeof(preauth->sha512_value));
 227
 228                 d = &derivation.signing;
 229                 d->label = data_blob_string_const_null("SMBSigningKey");
 230                 d->context = p;
 231
 232                 d = &derivation.decryption;
 233                 d->label = data_blob_string_const_null("SMBC2SCipherKey");
 234                 d->context = p;
 235
 236                 d = &derivation.encryption;
 237                 d->label = data_blob_string_const_null("SMBS2CCipherKey");
 238                 d->context = p;
 239
 240                 d = &derivation.application;
 241                 d->label = data_blob_string_const_null("SMBAppKey");
 242                 d->context = p;
 243
 244         } else if (xconn->protocol >= PROTOCOL_SMB2_24) {
 245                 struct _derivation *d;
 246
 247                 d = &derivation.signing;
 248                 d->label = data_blob_string_const_null("SMB2AESCMAC");
 249                 d->context = data_blob_string_const_null("SmbSign");
 250
 251                 d = &derivation.decryption;
 252                 d->label = data_blob_string_const_null("SMB2AESCCM");
 253                 d->context = data_blob_string_const_null("ServerIn ");
 254
 255                 d = &derivation.encryption;
 256                 d->label = data_blob_string_const_null("SMB2AESCCM");
 257                 d->context = data_blob_string_const_null("ServerOut");
 258
 259                 d = &derivation.application;
 260                 d->label = data_blob_string_const_null("SMB2APP");
 261                 d->context = data_blob_string_const_null("SmbRpc");
 262         }
 263
 264         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 265             (xconn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED))
 266         {
 267                 x->global->signing_flags = SMBXSRV_SIGNING_REQUIRED;
 268         }
 269
 270         if ((lp_smb_encrypt(-1) >= SMB_SIGNING_DESIRED) &&
 271             (xconn->smb2.client.capabilities & SMB2_CAP_ENCRYPTION)) {
 272                 x->global->encryption_flags = SMBXSRV_ENCRYPTION_DESIRED;
 273         }
 274
 275         if (lp_smb_encrypt(-1) == SMB_SIGNING_REQUIRED) {
 276                 x->global->encryption_flags = SMBXSRV_ENCRYPTION_REQUIRED |
 277                         SMBXSRV_ENCRYPTION_DESIRED;
 278         }
 279
 280         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 281                 if (security_session_user_level(session_info, NULL) == SECURITY_GUEST) {
 282                         *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 283                 }
 284                 /* force no signing */
 285                 x->global->signing_flags &= ~SMBXSRV_SIGNING_REQUIRED;
 286                 /* we map anonymous to guest internally */
 287                 guest = true;
 288         }
 289
 290         if (guest && (x->global->encryption_flags & SMBXSRV_ENCRYPTION_REQUIRED)) {
 291                 DEBUG(1,("reject guest session as encryption is required\n"));
 292                 return NT_STATUS_ACCESS_DENIED;
 293         }
 294
 295         if (xconn->smb2.server.cipher == 0) {
 296                 if (x->global->encryption_flags & SMBXSRV_ENCRYPTION_REQUIRED) {
 297                         DEBUG(1,("reject session with dialect[0x%04X] "
 298                                  "as encryption is required\n",
 299                                  xconn->smb2.server.dialect));
 300                         return NT_STATUS_ACCESS_DENIED;
 301                 }
 302         } else {
 303                 x->global->channels[0].encryption_cipher = xconn->smb2.server.cipher;
 304         }
 305
 306         if (x->global->encryption_flags & SMBXSRV_ENCRYPTION_DESIRED) {
 307                 *out_session_flags |= SMB2_SESSION_FLAG_ENCRYPT_DATA;
 308         }
 309
 310         ZERO_STRUCT(session_key);
 311         memcpy(session_key, session_info->session_key.data,
 312                MIN(session_info->session_key.length, sizeof(session_key)));
 313
 314         x->global->signing_key = data_blob_talloc(x->global,
 315                                                   session_key,
 316                                                   sizeof(session_key));
 317         if (x->global->signing_key.data == NULL) {
 318                 ZERO_STRUCT(session_key);
 319                 return NT_STATUS_NO_MEMORY;
 320         }
 321
 322         if (xconn->protocol >= PROTOCOL_SMB2_24) {
 323                 struct _derivation *d = &derivation.signing;
 324
 325                 smb2_key_derivation(session_key, sizeof(session_key),
 326                                     d->label.data, d->label.length,
 327                                     d->context.data, d->context.length,
 328                                     x->global->signing_key.data);
 329         }
 330
 331         if (xconn->protocol >= PROTOCOL_SMB2_24) {
 332                 struct _derivation *d = &derivation.decryption;
 333
 334                 x->global->decryption_key = data_blob_talloc(x->global,
 335                                                              session_key,
 336                                                              sizeof(session_key));
 337                 if (x->global->decryption_key.data == NULL) {
 338                         ZERO_STRUCT(session_key);
 339                         return NT_STATUS_NO_MEMORY;
 340                 }
 341
 342                 smb2_key_derivation(session_key, sizeof(session_key),
 343                                     d->label.data, d->label.length,
 344                                     d->context.data, d->context.length,
 345                                     x->global->decryption_key.data);
 346         }
 347
 348         if (xconn->protocol >= PROTOCOL_SMB2_24) {
 349                 struct _derivation *d = &derivation.encryption;
 350                 size_t nonce_size;
 351
 352                 x->global->encryption_key = data_blob_talloc(x->global,
 353                                                              session_key,
 354                                                              sizeof(session_key));
 355                 if (x->global->encryption_key.data == NULL) {
 356                         ZERO_STRUCT(session_key);
 357                         return NT_STATUS_NO_MEMORY;
 358                 }
 359
 360                 smb2_key_derivation(session_key, sizeof(session_key),
 361                                     d->label.data, d->label.length,
 362                                     d->context.data, d->context.length,
 363                                     x->global->encryption_key.data);
 364
 365                 /*
 366                  * CCM and GCM algorithms must never have their
 367                  * nonce wrap, or the security of the whole
 368                  * communication and the keys is destroyed.
 369                  * We must drop the connection once we have
 370                  * transfered too much data.
 371                  *
 372                  * NOTE: We assume nonces greater than 8 bytes.
 373                  */
 374                 generate_random_buffer((uint8_t *)&x->nonce_high_random,
 375                                        sizeof(x->nonce_high_random));
 376                 switch (xconn->smb2.server.cipher) {
 377                 case SMB2_ENCRYPTION_AES128_CCM:
 378                         nonce_size = AES_CCM_128_NONCE_SIZE;
 379                         break;
 380                 case SMB2_ENCRYPTION_AES128_GCM:
 381                         nonce_size = AES_GCM_128_IV_SIZE;
 382                         break;
 383                 default:
 384                         nonce_size = 0;
 385                         break;
 386                 }
 387                 x->nonce_high_max = SMB2_NONCE_HIGH_MAX(nonce_size);
 388                 x->nonce_high = 0;
 389                 x->nonce_low = 0;
 390         }
 391
 392         x->global->application_key = data_blob_dup_talloc(x->global,
 393                                                 x->global->signing_key);
 394         if (x->global->application_key.data == NULL) {
 395                 ZERO_STRUCT(session_key);
 396                 return NT_STATUS_NO_MEMORY;
 397         }
 398
 399         if (xconn->protocol >= PROTOCOL_SMB2_24) {
 400                 struct _derivation *d = &derivation.application;
 401
 402                 smb2_key_derivation(session_key, sizeof(session_key),
 403                                     d->label.data, d->label.length,
 404                                     d->context.data, d->context.length,
 405                                     x->global->application_key.data);
 406         }
 407         ZERO_STRUCT(session_key);
 408
 409         x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
 410                                                 x->global->signing_key);
 411         if (x->global->channels[0].signing_key.data == NULL) {
 412                 return NT_STATUS_NO_MEMORY;
 413         }
 414
 415         data_blob_clear_free(&session_info->session_key);
 416         session_info->session_key = data_blob_dup_talloc(session_info,
 417                                                 x->global->application_key);
 418         if (session_info->session_key.data == NULL) {
 419                 return NT_STATUS_NO_MEMORY;
 420         }
 421
 422         session->compat = talloc_zero(session, struct user_struct);
 423         if (session->compat == NULL) {
 424                 return NT_STATUS_NO_MEMORY;
 425         }
 426         session->compat->session = session;
 427         session->compat->homes_snum = -1;
 428         session->compat->session_info = session_info;
 429         session->compat->session_keystr = NULL;
 430         session->compat->vuid = session->global->session_wire_id;
 431         DLIST_ADD(smb2req->sconn->users, session->compat);
 432         smb2req->sconn->num_users++;
 433
 434         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 435                 session->compat->homes_snum =
 436                         register_homes_share(session_info->unix_info->unix_name);
 437         }
 438
 439         set_current_user_info(session_info->unix_info->sanitized_username,
 440                               session_info->unix_info->unix_name,
 441                               session_info->info->domain_name);
 442
 443         reload_services(smb2req->sconn, conn_snum_used, true);
 444
 445         session->status = NT_STATUS_OK;
 446         session->global->auth_session_info = talloc_move(session->global,
 447                                                          &session_info);
 448         session->global->auth_session_info_seqnum += 1;
 449         for (i=0; i < session->global->num_channels; i++) {
 450                 struct smbXsrv_channel_global0 *_c =
 451                         &session->global->channels[i];
 452
 453                 _c->auth_session_info_seqnum =
 454                         session->global->auth_session_info_seqnum;
 455         }
 456         session->global->auth_time = timeval_to_nttime(&smb2req->request_time);
 457         session->global->expiration_time = gensec_expire_time(auth->gensec);
 458
 459         if (!session_claim(session)) {
 460                 DEBUG(1, ("smb2: Failed to claim session "
 461                         "for vuid=%llu\n",
 462                         (unsigned long long)session->compat->vuid));
 463                 return NT_STATUS_LOGON_FAILURE;
 464         }
 465
 466         TALLOC_FREE(auth);
 467         status = smbXsrv_session_update(session);
 468         if (!NT_STATUS_IS_OK(status)) {
 469                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 470                           (unsigned long long)session->compat->vuid,
 471                           nt_errstr(status)));
 472                 return NT_STATUS_LOGON_FAILURE;
 473         }
 474
 475         /*
 476          * we attach the session to the request
 477          * so that the response can be signed
 478          */
 479         if (!guest) {
 480                 smb2req->do_signing = true;
 481         }
 482
 483         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 484
 485         *out_session_id = session->global->session_wire_id;
 486
 487         return NT_STATUS_OK;
 488 }
 489
 490 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
 491                                         struct smbXsrv_session_auth0 **_auth,
 492                                         struct smbd_smb2_request *smb2req,
 493                                         struct auth_session_info *session_info,
 494                                         uint16_t *out_session_flags,
 495                                         uint64_t *out_session_id)
 496 {
 497         NTSTATUS status;
 498         struct smbXsrv_session *x = session;
 499         struct smbXsrv_session_auth0 *auth = *_auth;
 500         struct smbXsrv_connection *xconn = smb2req->xconn;
 501         size_t i;
 502
 503         *_auth = NULL;
 504
 505         data_blob_clear_free(&session_info->session_key);
 506         session_info->session_key = data_blob_dup_talloc(session_info,
 507                                                 x->global->application_key);
 508         if (session_info->session_key.data == NULL) {
 509                 return NT_STATUS_NO_MEMORY;
 510         }
 511
 512         session->compat->session_info = session_info;
 513         session->compat->vuid = session->global->session_wire_id;
 514
 515         session->compat->homes_snum =
 516                         register_homes_share(session_info->unix_info->unix_name);
 517
 518         set_current_user_info(session_info->unix_info->sanitized_username,
 519                               session_info->unix_info->unix_name,
 520                               session_info->info->domain_name);
 521
 522         reload_services(smb2req->sconn, conn_snum_used, true);
 523
 524         session->status = NT_STATUS_OK;
 525         TALLOC_FREE(session->global->auth_session_info);
 526         session->global->auth_session_info = talloc_move(session->global,
 527                                                          &session_info);
 528         session->global->auth_session_info_seqnum += 1;
 529         for (i=0; i < session->global->num_channels; i++) {
 530                 struct smbXsrv_channel_global0 *_c =
 531                         &session->global->channels[i];
 532
 533                 _c->auth_session_info_seqnum =
 534                         session->global->auth_session_info_seqnum;
 535         }
 536         session->global->auth_time = timeval_to_nttime(&smb2req->request_time);
 537         session->global->expiration_time = gensec_expire_time(auth->gensec);
 538
 539         TALLOC_FREE(auth);
 540         status = smbXsrv_session_update(session);
 541         if (!NT_STATUS_IS_OK(status)) {
 542                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 543                           (unsigned long long)session->compat->vuid,
 544                           nt_errstr(status)));
 545                 return NT_STATUS_LOGON_FAILURE;
 546         }
 547
 548         conn_clear_vuid_caches(xconn->client->sconn, session->compat->vuid);
 549
 550         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 551                 smb2req->do_signing = true;
 552         }
 553
 554         *out_session_id = session->global->session_wire_id;
 555
 556         return NT_STATUS_OK;
 557 }
 558
 559 static NTSTATUS smbd_smb2_bind_auth_return(struct smbXsrv_session *session,
 560                                            struct smbXsrv_session_auth0 **_auth,
 561                                            struct smbd_smb2_request *smb2req,
 562                                            struct auth_session_info *session_info,
 563                                            uint16_t *out_session_flags,
 564                                            uint64_t *out_session_id)
 565 {
 566         NTSTATUS status;
 567         struct smbXsrv_session *x = session;
 568         struct smbXsrv_session_auth0 *auth = *_auth;
 569         struct smbXsrv_connection *xconn = smb2req->xconn;
 570         struct smbXsrv_channel_global0 *c = NULL;
 571         uint8_t session_key[16];
 572         size_t i;
 573         struct _derivation {
 574                 DATA_BLOB label;
 575                 DATA_BLOB context;
 576         };
 577         struct {
 578                 struct _derivation signing;
 579         } derivation = { };
 580         bool ok;
 581
 582         *_auth = NULL;
 583
 584         if (xconn->protocol >= PROTOCOL_SMB3_10) {
 585                 struct smbXsrv_preauth *preauth;
 586                 struct _derivation *d;
 587                 DATA_BLOB p;
 588                 struct hc_sha512state sctx;
 589
 590                 preauth = talloc_move(smb2req, &auth->preauth);
 591
 592                 samba_SHA512_Init(&sctx);
 593                 samba_SHA512_Update(&sctx, preauth->sha512_value,
 594                                     sizeof(preauth->sha512_value));
 595                 for (i = 1; i < smb2req->in.vector_count; i++) {
 596                         samba_SHA512_Update(&sctx,
 597                                             smb2req->in.vector[i].iov_base,
 598                                             smb2req->in.vector[i].iov_len);
 599                 }
 600                 samba_SHA512_Final(preauth->sha512_value, &sctx);
 601
 602                 p = data_blob_const(preauth->sha512_value,
 603                                     sizeof(preauth->sha512_value));
 604
 605                 d = &derivation.signing;
 606                 d->label = data_blob_string_const_null("SMBSigningKey");
 607                 d->context = p;
 608
 609         } else if (xconn->protocol >= PROTOCOL_SMB2_24) {
 610                 struct _derivation *d;
 611
 612                 d = &derivation.signing;
 613                 d->label = data_blob_string_const_null("SMB2AESCMAC");
 614                 d->context = data_blob_string_const_null("SmbSign");
 615         }
 616
 617         status = smbXsrv_session_find_channel(session, xconn, &c);
 618         if (!NT_STATUS_IS_OK(status)) {
 619                 return status;
 620         }
 621
 622         ok = security_token_is_sid(session_info->security_token,
 623                         &x->global->auth_session_info->security_token->sids[0]);
 624         if (!ok) {
 625                 return NT_STATUS_NOT_SUPPORTED;
 626         }
 627
 628         if (session_info->session_key.length == 0) {
 629                 /* See [MS-SMB2] 3.3.5.2.4 for the return code. */
 630                 return NT_STATUS_NOT_SUPPORTED;
 631         }
 632
 633         ZERO_STRUCT(session_key);
 634         memcpy(session_key, session_info->session_key.data,
 635                MIN(session_info->session_key.length, sizeof(session_key)));
 636
 637         c->signing_key = data_blob_talloc(x->global,
 638                                           session_key,
 639                                           sizeof(session_key));
 640         if (c->signing_key.data == NULL) {
 641                 ZERO_STRUCT(session_key);
 642                 return NT_STATUS_NO_MEMORY;
 643         }
 644
 645         if (xconn->protocol >= PROTOCOL_SMB2_24) {
 646                 struct _derivation *d = &derivation.signing;
 647
 648                 smb2_key_derivation(session_key, sizeof(session_key),
 649                                     d->label.data, d->label.length,
 650                                     d->context.data, d->context.length,
 651                                     c->signing_key.data);
 652         }
 653         ZERO_STRUCT(session_key);
 654
 655         TALLOC_FREE(auth);
 656         status = smbXsrv_session_update(session);
 657         if (!NT_STATUS_IS_OK(status)) {
 658                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 659                           (unsigned long long)session->compat->vuid,
 660                           nt_errstr(status)));
 661                 return NT_STATUS_LOGON_FAILURE;
 662         }
 663
 664         *out_session_id = session->global->session_wire_id;
 665
 666         return NT_STATUS_OK;
 667 }
 668
 669 struct smbd_smb2_session_setup_state {
 670         struct tevent_context *ev;
 671         struct smbd_smb2_request *smb2req;
 672         uint64_t in_session_id;
 673         uint8_t in_flags;
 674         uint8_t in_security_mode;
 675         uint64_t in_previous_session_id;
 676         DATA_BLOB in_security_buffer;
 677         struct smbXsrv_session *session;
 678         struct smbXsrv_session_auth0 *auth;
 679         struct auth_session_info *session_info;
 680         uint16_t out_session_flags;
 681         DATA_BLOB out_security_buffer;
 682         uint64_t out_session_id;
 683 };
 684
 685 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 686 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 687 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req);
 688
 689 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 690                                         struct tevent_context *ev,
 691                                         struct smbd_smb2_request *smb2req,
 692                                         uint64_t in_session_id,
 693                                         uint8_t in_flags,
 694                                         uint8_t in_security_mode,
 695                                         uint64_t in_previous_session_id,
 696                                         DATA_BLOB in_security_buffer)
 697 {
 698         struct tevent_req *req;
 699         struct smbd_smb2_session_setup_state *state;
 700         NTSTATUS status;
 701         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 702         struct tevent_req *subreq;
 703         struct smbXsrv_channel_global0 *c = NULL;
 704         enum security_user_level seclvl;
 705
 706         req = tevent_req_create(mem_ctx, &state,
 707                                 struct smbd_smb2_session_setup_state);
 708         if (req == NULL) {
 709                 return NULL;
 710         }
 711         state->ev = ev;
 712         state->smb2req = smb2req;
 713         state->in_session_id = in_session_id;
 714         state->in_flags = in_flags;
 715         state->in_security_mode = in_security_mode;
 716         state->in_previous_session_id = in_previous_session_id;
 717         state->in_security_buffer = in_security_buffer;
 718
 719         if (in_flags & SMB2_SESSION_FLAG_BINDING) {
 720                 if (smb2req->xconn->protocol < PROTOCOL_SMB2_22) {
 721                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 722                         return tevent_req_post(req, ev);
 723                 }
 724
 725                 if (!smb2req->xconn->client->server_multi_channel_enabled) {
 726                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 727                         return tevent_req_post(req, ev);
 728                 }
 729
 730                 if (in_session_id == 0) {
 731                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 732                         return tevent_req_post(req, ev);
 733                 }
 734
 735                 if (smb2req->session == NULL) {
 736                         tevent_req_nterror(req, NT_STATUS_USER_SESSION_DELETED);
 737                         return tevent_req_post(req, ev);
 738                 }
 739
 740                 if (!smb2req->do_signing) {
 741                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 742                         return tevent_req_post(req, ev);
 743                 }
 744
 745                 status = smbXsrv_session_find_channel(smb2req->session,
 746                                                       smb2req->xconn,
 747                                                       &c);
 748                 if (NT_STATUS_IS_OK(status)) {
 749                         if (c->signing_key.length == 0) {
 750                                 goto auth;
 751                         }
 752                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 753                         return tevent_req_post(req, ev);
 754                 }
 755
 756                 /*
 757                  * OLD: 3.00 NEW 3.02 => INVALID_PARAMETER
 758                  * OLD: 3.02 NEW 3.00 => INVALID_PARAMETER
 759                  * OLD: 2.10 NEW 3.02 => ACCESS_DENIED
 760                  * OLD: 3.02 NEW 2.10 => ACCESS_DENIED
 761                  */
 762                 if (smb2req->session->global->connection_dialect
 763                     < SMB2_DIALECT_REVISION_222)
 764                 {
 765                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 766                         return tevent_req_post(req, ev);
 767                 }
 768                 if (smb2req->xconn->smb2.server.dialect
 769                     < SMB2_DIALECT_REVISION_222)
 770                 {
 771                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 772                         return tevent_req_post(req, ev);
 773                 }
 774                 if (smb2req->session->global->connection_dialect
 775                     != smb2req->xconn->smb2.server.dialect)
 776                 {
 777                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 778                         return tevent_req_post(req, ev);
 779                 }
 780
 781                 seclvl = security_session_user_level(
 782                                 smb2req->session->global->auth_session_info,
 783                                 NULL);
 784                 if (seclvl < SECURITY_USER) {
 785                         tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 786                         return tevent_req_post(req, ev);
 787                 }
 788
 789                 status = smbXsrv_session_add_channel(smb2req->session,
 790                                                      smb2req->xconn,
 791                                                      &c);
 792                 if (!NT_STATUS_IS_OK(status)) {
 793                         tevent_req_nterror(req, status);
 794                         return tevent_req_post(req, ev);
 795                 }
 796
 797                 status = smbXsrv_session_update(smb2req->session);
 798                 if (!NT_STATUS_IS_OK(status)) {
 799                         tevent_req_nterror(req, status);
 800                         return tevent_req_post(req, ev);
 801                 }
 802         }
 803
 804 auth:
 805
 806         if (state->in_session_id == 0) {
 807                 /* create a new session */
 808                 status = smbXsrv_session_create(state->smb2req->xconn,
 809                                                 now, &state->session);
 810                 if (tevent_req_nterror(req, status)) {
 811                         return tevent_req_post(req, ev);
 812                 }
 813                 smb2req->session = state->session;
 814         } else {
 815                 if (smb2req->session == NULL) {
 816                         tevent_req_nterror(req, NT_STATUS_USER_SESSION_DELETED);
 817                         return tevent_req_post(req, ev);
 818                 }
 819
 820                 state->session = smb2req->session;
 821                 status = state->session->status;
 822                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 823                         status = NT_STATUS_OK;
 824                 }
 825                 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 826                         status = NT_STATUS_OK;
 827                 }
 828                 if (tevent_req_nterror(req, status)) {
 829                         return tevent_req_post(req, ev);
 830                 }
 831                 if (!(in_flags & SMB2_SESSION_FLAG_BINDING)) {
 832                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 833                 }
 834         }
 835
 836         status = smbXsrv_session_find_channel(smb2req->session,
 837                                               smb2req->xconn, &c);
 838         if (!NT_STATUS_IS_OK(status)) {
 839                 tevent_req_nterror(req, status);
 840                 return tevent_req_post(req, ev);
 841         }
 842
 843         status = smbXsrv_session_find_auth(state->session, smb2req->xconn,
 844                                            now, &state->auth);
 845         if (!NT_STATUS_IS_OK(status)) {
 846                 status = smbXsrv_session_create_auth(state->session,
 847                                                      smb2req->xconn, now,
 848                                                      in_flags, in_security_mode,
 849                                                      &state->auth);
 850                 if (tevent_req_nterror(req, status)) {
 851                         return tevent_req_post(req, ev);
 852                 }
 853         }
 854
 855         if (state->auth->gensec == NULL) {
 856                 status = auth_generic_prepare(state->auth,
 857                                               state->smb2req->xconn->remote_address,
 858                                               &state->auth->gensec);
 859                 if (tevent_req_nterror(req, status)) {
 860                         return tevent_req_post(req, ev);
 861                 }
 862
 863                 gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_SESSION_KEY);
 864                 gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 865
 866                 status = gensec_start_mech_by_oid(state->auth->gensec,
 867                                                   GENSEC_OID_SPNEGO);
 868                 if (tevent_req_nterror(req, status)) {
 869                         return tevent_req_post(req, ev);
 870                 }
 871         }
 872
 873         status = smbXsrv_session_update(state->session);
 874         if (tevent_req_nterror(req, status)) {
 875                 return tevent_req_post(req, ev);
 876         }
 877
 878         become_root();
 879         subreq = gensec_update_send(state, state->ev,
 880                                     state->auth->gensec,
 881                                     state->in_security_buffer);
 882         unbecome_root();
 883         if (tevent_req_nomem(subreq, req)) {
 884                 return tevent_req_post(req, ev);
 885         }
 886         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 887
 888         return req;
 889 }
 890
 891 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 892 {
 893         struct tevent_req *req =
 894                 tevent_req_callback_data(subreq,
 895                 struct tevent_req);
 896         struct smbd_smb2_session_setup_state *state =
 897                 tevent_req_data(req,
 898                 struct smbd_smb2_session_setup_state);
 899         NTSTATUS status;
 900
 901         become_root();
 902         status = gensec_update_recv(subreq, state,
 903                                     &state->out_security_buffer);
 904         unbecome_root();
 905         TALLOC_FREE(subreq);
 906         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 907             !NT_STATUS_IS_OK(status)) {
 908                 tevent_req_nterror(req, status);
 909                 return;
 910         }
 911
 912         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 913                 state->out_session_id = state->session->global->session_wire_id;
 914                 state->smb2req->preauth = state->auth->preauth;
 915                 tevent_req_nterror(req, status);
 916                 return;
 917         }
 918
 919         status = gensec_session_info(state->auth->gensec,
 920                                      state,
 921                                      &state->session_info);
 922         if (tevent_req_nterror(req, status)) {
 923                 return;
 924         }
 925
 926         if ((state->in_previous_session_id != 0) &&
 927              (state->session->global->session_wire_id !=
 928               state->in_previous_session_id))
 929         {
 930                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 931                                                 state->smb2req->xconn,
 932                                                 state->session_info,
 933                                                 state->in_previous_session_id,
 934                                                 state->session->global->session_wire_id);
 935                 if (tevent_req_nomem(subreq, req)) {
 936                         return;
 937                 }
 938                 tevent_req_set_callback(subreq,
 939                                         smbd_smb2_session_setup_previous_done,
 940                                         req);
 941                 return;
 942         }
 943
 944         smbd_smb2_session_setup_auth_return(req);
 945 }
 946
 947 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 948 {
 949         struct tevent_req *req =
 950                 tevent_req_callback_data(subreq,
 951                 struct tevent_req);
 952         NTSTATUS status;
 953
 954         status = smb2srv_session_close_previous_recv(subreq);
 955         TALLOC_FREE(subreq);
 956         if (tevent_req_nterror(req, status)) {
 957                 return;
 958         }
 959
 960         smbd_smb2_session_setup_auth_return(req);
 961 }
 962
 963 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req)
 964 {
 965         struct smbd_smb2_session_setup_state *state =
 966                 tevent_req_data(req,
 967                 struct smbd_smb2_session_setup_state);
 968         NTSTATUS status;
 969
 970         if (state->in_flags & SMB2_SESSION_FLAG_BINDING) {
 971                 status = smbd_smb2_bind_auth_return(state->session,
 972                                                     &state->auth,
 973                                                     state->smb2req,
 974                                                     state->session_info,
 975                                                     &state->out_session_flags,
 976                                                     &state->out_session_id);
 977                 if (tevent_req_nterror(req, status)) {
 978                         return;
 979                 }
 980                 tevent_req_done(req);
 981                 return;
 982         }
 983
 984         if (state->session->global->auth_session_info != NULL) {
 985                 status = smbd_smb2_reauth_generic_return(state->session,
 986                                                          &state->auth,
 987                                                          state->smb2req,
 988                                                          state->session_info,
 989                                                          &state->out_session_flags,
 990                                                          &state->out_session_id);
 991                 if (tevent_req_nterror(req, status)) {
 992                         return;
 993                 }
 994                 tevent_req_done(req);
 995                 return;
 996         }
 997
 998         status = smbd_smb2_auth_generic_return(state->session,
 999                                                &state->auth,
1000                                                state->smb2req,
1001                                                state->in_security_mode,
1002                                                state->session_info,
1003                                                &state->out_session_flags,
1004                                                &state->out_session_id);
1005         if (tevent_req_nterror(req, status)) {
1006                 return;
1007         }
1008
1009         tevent_req_done(req);
1010         return;
1011 }
1012
1013 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
1014                                         uint16_t *out_session_flags,
1015                                         TALLOC_CTX *mem_ctx,
1016                                         DATA_BLOB *out_security_buffer,
1017                                         uint64_t *out_session_id)
1018 {
1019         struct smbd_smb2_session_setup_state *state =
1020                 tevent_req_data(req,
1021                 struct smbd_smb2_session_setup_state);
1022         NTSTATUS status;
1023
1024         if (tevent_req_is_nterror(req, &status)) {
1025                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1026                         tevent_req_received(req);
1027                         return nt_status_squash(status);
1028                 }
1029         } else {
1030                 status = NT_STATUS_OK;
1031         }
1032
1033         *out_session_flags = state->out_session_flags;
1034         *out_security_buffer = state->out_security_buffer;
1035         *out_session_id = state->out_session_id;
1036
1037         talloc_steal(mem_ctx, out_security_buffer->data);
1038         tevent_req_received(req);
1039         return status;
1040 }
1041
1042 struct smbd_smb2_session_setup_wrap_state {
1043         struct tevent_context *ev;
1044         struct smbd_smb2_request *smb2req;
1045         uint64_t in_session_id;
1046         uint8_t in_flags;
1047         uint8_t in_security_mode;
1048         uint64_t in_previous_session_id;
1049         DATA_BLOB in_security_buffer;
1050         uint16_t out_session_flags;
1051         DATA_BLOB out_security_buffer;
1052         uint64_t out_session_id;
1053         NTSTATUS error;
1054 };
1055
1056 static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq);
1057 static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq);
1058
1059 static struct tevent_req *smbd_smb2_session_setup_wrap_send(TALLOC_CTX *mem_ctx,
1060                                         struct tevent_context *ev,
1061                                         struct smbd_smb2_request *smb2req,
1062                                         uint64_t in_session_id,
1063                                         uint8_t in_flags,
1064                                         uint8_t in_security_mode,
1065                                         uint64_t in_previous_session_id,
1066                                         DATA_BLOB in_security_buffer)
1067 {
1068         struct tevent_req *req;
1069         struct smbd_smb2_session_setup_wrap_state *state;
1070         struct tevent_req *subreq;
1071
1072         req = tevent_req_create(mem_ctx, &state,
1073                                 struct smbd_smb2_session_setup_wrap_state);
1074         if (req == NULL) {
1075                 return NULL;
1076         }
1077         state->ev = ev;
1078         state->smb2req = smb2req;
1079         state->in_session_id = in_session_id;
1080         state->in_flags = in_flags;
1081         state->in_security_mode = in_security_mode;
1082         state->in_previous_session_id = in_previous_session_id;
1083         state->in_security_buffer = in_security_buffer;
1084
1085         subreq = smbd_smb2_session_setup_send(state, state->ev,
1086                                               state->smb2req,
1087                                               state->in_session_id,
1088                                               state->in_flags,
1089                                               state->in_security_mode,
1090                                               state->in_previous_session_id,
1091                                               state->in_security_buffer);
1092         if (tevent_req_nomem(subreq, req)) {
1093                 return tevent_req_post(req, ev);
1094         }
1095         tevent_req_set_callback(subreq,
1096                                 smbd_smb2_session_setup_wrap_setup_done, req);
1097
1098         return req;
1099 }
1100
1101 static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq)
1102 {
1103         struct tevent_req *req =
1104                 tevent_req_callback_data(subreq,
1105                 struct tevent_req);
1106         struct smbd_smb2_session_setup_wrap_state *state =
1107                 tevent_req_data(req,
1108                 struct smbd_smb2_session_setup_wrap_state);
1109         NTSTATUS status;
1110
1111         status = smbd_smb2_session_setup_recv(subreq,
1112                                               &state->out_session_flags,
1113                                               state,
1114                                               &state->out_security_buffer,
1115                                               &state->out_session_id);
1116         TALLOC_FREE(subreq);
1117         if (NT_STATUS_IS_OK(status)) {
1118                 tevent_req_done(req);
1119                 return;
1120         }
1121         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1122                 tevent_req_nterror(req, status);
1123                 return;
1124         }
1125
1126         if (state->smb2req->session == NULL) {
1127                 tevent_req_nterror(req, status);
1128                 return;
1129         }
1130
1131         state->error = status;
1132
1133         subreq = smb2srv_session_shutdown_send(state, state->ev,
1134                                                state->smb2req->session,
1135                                                state->smb2req);
1136         if (tevent_req_nomem(subreq, req)) {
1137                 return;
1138         }
1139         tevent_req_set_callback(subreq,
1140                                 smbd_smb2_session_setup_wrap_shutdown_done,
1141                                 req);
1142 }
1143
1144 static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq)
1145 {
1146         struct tevent_req *req =
1147                 tevent_req_callback_data(subreq,
1148                 struct tevent_req);
1149         struct smbd_smb2_session_setup_wrap_state *state =
1150                 tevent_req_data(req,
1151                 struct smbd_smb2_session_setup_wrap_state);
1152         NTSTATUS status;
1153
1154         status = smb2srv_session_shutdown_recv(subreq);
1155         TALLOC_FREE(subreq);
1156         if (tevent_req_nterror(req, status)) {
1157                 return;
1158         }
1159
1160         /*
1161          * we may need to sign the response, so we need to keep
1162          * the session until the response is sent to the wire.
1163          */
1164         talloc_steal(state->smb2req, state->smb2req->session);
1165
1166         tevent_req_nterror(req, state->error);
1167 }
1168
1169 static NTSTATUS smbd_smb2_session_setup_wrap_recv(struct tevent_req *req,
1170                                         uint16_t *out_session_flags,
1171                                         TALLOC_CTX *mem_ctx,
1172                                         DATA_BLOB *out_security_buffer,
1173                                         uint64_t *out_session_id)
1174 {
1175         struct smbd_smb2_session_setup_wrap_state *state =
1176                 tevent_req_data(req,
1177                 struct smbd_smb2_session_setup_wrap_state);
1178         NTSTATUS status;
1179
1180         if (tevent_req_is_nterror(req, &status)) {
1181                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1182                         tevent_req_received(req);
1183                         return nt_status_squash(status);
1184                 }
1185         } else {
1186                 status = NT_STATUS_OK;
1187         }
1188
1189         *out_session_flags = state->out_session_flags;
1190         *out_security_buffer = state->out_security_buffer;
1191         *out_session_id = state->out_session_id;
1192
1193         talloc_steal(mem_ctx, out_security_buffer->data);
1194         tevent_req_received(req);
1195         return status;
1196 }
1197
1198 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
1199                                         struct tevent_context *ev,
1200                                         struct smbd_smb2_request *smb2req);
1201 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req);
1202 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq);
1203
1204 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
1205 {
1206         NTSTATUS status;
1207         struct tevent_req *subreq = NULL;
1208
1209         status = smbd_smb2_request_verify_sizes(req, 0x04);
1210         if (!NT_STATUS_IS_OK(status)) {
1211                 return smbd_smb2_request_error(req, status);
1212         }
1213
1214         subreq = smbd_smb2_logoff_send(req, req->sconn->ev_ctx, req);
1215         if (subreq == NULL) {
1216                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
1217         }
1218         tevent_req_set_callback(subreq, smbd_smb2_request_logoff_done, req);
1219
1220         /*
1221          * Wait a long time before going async on this to allow
1222          * requests we're waiting on to finish. Set timeout to 10 secs.
1223          */
1224         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
1225 }
1226
1227 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq)
1228 {
1229         struct smbd_smb2_request *smb2req =
1230                 tevent_req_callback_data(subreq,
1231                 struct smbd_smb2_request);
1232         DATA_BLOB outbody;
1233         NTSTATUS status;
1234         NTSTATUS error;
1235
1236         status = smbd_smb2_logoff_recv(subreq);
1237         TALLOC_FREE(subreq);
1238         if (!NT_STATUS_IS_OK(status)) {
1239                 error = smbd_smb2_request_error(smb2req, status);
1240                 if (!NT_STATUS_IS_OK(error)) {
1241                         smbd_server_connection_terminate(smb2req->xconn,
1242                                                         nt_errstr(error));
1243                         return;
1244                 }
1245                 return;
1246         }
1247
1248         outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
1249         if (outbody.data == NULL) {
1250                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
1251                 if (!NT_STATUS_IS_OK(error)) {
1252                         smbd_server_connection_terminate(smb2req->xconn,
1253                                                         nt_errstr(error));
1254                         return;
1255                 }
1256                 return;
1257         }
1258
1259         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
1260         SSVAL(outbody.data, 0x02, 0);           /* reserved */
1261
1262         error = smbd_smb2_request_done(smb2req, outbody, NULL);
1263         if (!NT_STATUS_IS_OK(error)) {
1264                 smbd_server_connection_terminate(smb2req->xconn,
1265                                                 nt_errstr(error));
1266                 return;
1267         }
1268 }
1269
1270 struct smbd_smb2_logoff_state {
1271         struct smbd_smb2_request *smb2req;
1272 };
1273
1274 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq);
1275
1276 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
1277                                         struct tevent_context *ev,
1278                                         struct smbd_smb2_request *smb2req)
1279 {
1280         struct tevent_req *req;
1281         struct smbd_smb2_logoff_state *state;
1282         struct tevent_req *subreq;
1283
1284         req = tevent_req_create(mem_ctx, &state,
1285                         struct smbd_smb2_logoff_state);
1286         if (req == NULL) {
1287                 return NULL;
1288         }
1289         state->smb2req = smb2req;
1290
1291         subreq = smb2srv_session_shutdown_send(state, ev,
1292                                                smb2req->session,
1293                                                smb2req);
1294         if (tevent_req_nomem(subreq, req)) {
1295                 return tevent_req_post(req, ev);
1296         }
1297         tevent_req_set_callback(subreq, smbd_smb2_logoff_shutdown_done, req);
1298
1299         return req;
1300 }
1301
1302 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq)
1303 {
1304         struct tevent_req *req = tevent_req_callback_data(
1305                 subreq, struct tevent_req);
1306         struct smbd_smb2_logoff_state *state = tevent_req_data(
1307                 req, struct smbd_smb2_logoff_state);
1308         NTSTATUS status;
1309         bool ok;
1310         const struct GUID *client_guid =
1311                 &state->smb2req->session->client->connections->smb2.client.guid;
1312
1313         status = smb2srv_session_shutdown_recv(subreq);
1314         if (tevent_req_nterror(req, status)) {
1315                 return;
1316         }
1317         TALLOC_FREE(subreq);
1318
1319         if (!GUID_all_zero(client_guid)) {
1320                 ok = remote_arch_cache_delete(client_guid);
1321                 if (!ok) {
1322                         /* Most likely not an error, but not in cache */
1323                         DBG_DEBUG("Deletion from remote arch cache failed\n");
1324                 }
1325         }
1326
1327         /*
1328          * As we've been awoken, we may have changed
1329          * uid in the meantime. Ensure we're still
1330          * root (SMB2_OP_LOGOFF has .as_root = true).
1331          */
1332         change_to_root_user();
1333
1334         status = smbXsrv_session_logoff(state->smb2req->session);
1335         if (tevent_req_nterror(req, status)) {
1336                 return;
1337         }
1338
1339         /*
1340          * we may need to sign the response, so we need to keep
1341          * the session until the response is sent to the wire.
1342          */
1343         talloc_steal(state->smb2req, state->smb2req->session);
1344
1345         tevent_req_done(req);
1346 }
1347
1348 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req)
1349 {
1350         return tevent_req_simple_recv_ntstatus(req);
1351 }