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             lp_server_signing() == SMB_SIGNING_REQUIRED) {
 266                 x->global->signing_required = true;
 267         }
 268
 269         if ((lp_smb_encrypt(-1) >= SMB_SIGNING_DESIRED) &&
 270             (xconn->smb2.client.capabilities & SMB2_CAP_ENCRYPTION)) {
 271                 x->encryption_desired = true;
 272         }
 273
 274         if (lp_smb_encrypt(-1) == SMB_SIGNING_REQUIRED) {
 275                 x->encryption_desired = true;
 276                 x->global->encryption_required = true;
 277         }
 278
 279         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 280                 /* we map anonymous to guest internally */
 281                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 282                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 283                 /* force no signing */
 284                 x->global->signing_required = false;
 285                 guest = true;
 286         }
 287
 288         if (guest && x->global->encryption_required) {
 289                 DEBUG(1,("reject guest session as encryption is required\n"));
 290                 return NT_STATUS_ACCESS_DENIED;
 291         }
 292
 293         if (xconn->smb2.server.cipher == 0) {
 294                 if (x->global->encryption_required) {
 295                         DEBUG(1,("reject session with dialect[0x%04X] "
 296                                  "as encryption is required\n",
 297                                  xconn->smb2.server.dialect));
 298                         return NT_STATUS_ACCESS_DENIED;
 299                 }
 300         }
 301
 302         if (x->encryption_desired) {
 303                 *out_session_flags |= SMB2_SESSION_FLAG_ENCRYPT_DATA;
 304         }
 305
 306         ZERO_STRUCT(session_key);
 307         memcpy(session_key, session_info->session_key.data,
 308                MIN(session_info->session_key.length, sizeof(session_key)));
 309
 310         x->global->signing_key = data_blob_talloc(x->global,
 311                                                   session_key,
 312                                                   sizeof(session_key));
 313         if (x->global->signing_key.data == NULL) {
 314                 ZERO_STRUCT(session_key);
 315                 return NT_STATUS_NO_MEMORY;
 316         }
 317
 318         if (xconn->protocol >= PROTOCOL_SMB2_24) {
 319                 struct _derivation *d = &derivation.signing;
 320
 321                 smb2_key_derivation(session_key, sizeof(session_key),
 322                                     d->label.data, d->label.length,
 323                                     d->context.data, d->context.length,
 324                                     x->global->signing_key.data);
 325         }
 326
 327         if (xconn->protocol >= PROTOCOL_SMB2_24) {
 328                 struct _derivation *d = &derivation.decryption;
 329
 330                 x->global->decryption_key = data_blob_talloc(x->global,
 331                                                              session_key,
 332                                                              sizeof(session_key));
 333                 if (x->global->decryption_key.data == NULL) {
 334                         ZERO_STRUCT(session_key);
 335                         return NT_STATUS_NO_MEMORY;
 336                 }
 337
 338                 smb2_key_derivation(session_key, sizeof(session_key),
 339                                     d->label.data, d->label.length,
 340                                     d->context.data, d->context.length,
 341                                     x->global->decryption_key.data);
 342         }
 343
 344         if (xconn->protocol >= PROTOCOL_SMB2_24) {
 345                 struct _derivation *d = &derivation.encryption;
 346                 size_t nonce_size;
 347
 348                 x->global->encryption_key = data_blob_talloc(x->global,
 349                                                              session_key,
 350                                                              sizeof(session_key));
 351                 if (x->global->encryption_key.data == NULL) {
 352                         ZERO_STRUCT(session_key);
 353                         return NT_STATUS_NO_MEMORY;
 354                 }
 355
 356                 smb2_key_derivation(session_key, sizeof(session_key),
 357                                     d->label.data, d->label.length,
 358                                     d->context.data, d->context.length,
 359                                     x->global->encryption_key.data);
 360
 361                 /*
 362                  * CCM and GCM algorithms must never have their
 363                  * nonce wrap, or the security of the whole
 364                  * communication and the keys is destroyed.
 365                  * We must drop the connection once we have
 366                  * transfered too much data.
 367                  *
 368                  * NOTE: We assume nonces greater than 8 bytes.
 369                  */
 370                 generate_random_buffer((uint8_t *)&x->nonce_high_random,
 371                                        sizeof(x->nonce_high_random));
 372                 switch (xconn->smb2.server.cipher) {
 373                 case SMB2_ENCRYPTION_AES128_CCM:
 374                         nonce_size = AES_CCM_128_NONCE_SIZE;
 375                         break;
 376                 case SMB2_ENCRYPTION_AES128_GCM:
 377                         nonce_size = AES_GCM_128_IV_SIZE;
 378                         break;
 379                 default:
 380                         nonce_size = 0;
 381                         break;
 382                 }
 383                 x->nonce_high_max = SMB2_NONCE_HIGH_MAX(nonce_size);
 384                 x->nonce_high = 0;
 385                 x->nonce_low = 0;
 386         }
 387
 388         x->global->application_key = data_blob_dup_talloc(x->global,
 389                                                 x->global->signing_key);
 390         if (x->global->application_key.data == NULL) {
 391                 ZERO_STRUCT(session_key);
 392                 return NT_STATUS_NO_MEMORY;
 393         }
 394
 395         if (xconn->protocol >= PROTOCOL_SMB2_24) {
 396                 struct _derivation *d = &derivation.application;
 397
 398                 smb2_key_derivation(session_key, sizeof(session_key),
 399                                     d->label.data, d->label.length,
 400                                     d->context.data, d->context.length,
 401                                     x->global->application_key.data);
 402         }
 403         ZERO_STRUCT(session_key);
 404
 405         x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
 406                                                 x->global->signing_key);
 407         if (x->global->channels[0].signing_key.data == NULL) {
 408                 return NT_STATUS_NO_MEMORY;
 409         }
 410
 411         data_blob_clear_free(&session_info->session_key);
 412         session_info->session_key = data_blob_dup_talloc(session_info,
 413                                                 x->global->application_key);
 414         if (session_info->session_key.data == NULL) {
 415                 return NT_STATUS_NO_MEMORY;
 416         }
 417
 418         session->compat = talloc_zero(session, struct user_struct);
 419         if (session->compat == NULL) {
 420                 return NT_STATUS_NO_MEMORY;
 421         }
 422         session->compat->session = session;
 423         session->compat->homes_snum = -1;
 424         session->compat->session_info = session_info;
 425         session->compat->session_keystr = NULL;
 426         session->compat->vuid = session->global->session_wire_id;
 427         DLIST_ADD(smb2req->sconn->users, session->compat);
 428         smb2req->sconn->num_users++;
 429
 430         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 431                 session->compat->homes_snum =
 432                         register_homes_share(session_info->unix_info->unix_name);
 433         }
 434
 435         set_current_user_info(session_info->unix_info->sanitized_username,
 436                               session_info->unix_info->unix_name,
 437                               session_info->info->domain_name);
 438
 439         reload_services(smb2req->sconn, conn_snum_used, true);
 440
 441         session->status = NT_STATUS_OK;
 442         session->global->auth_session_info = talloc_move(session->global,
 443                                                          &session_info);
 444         session->global->auth_session_info_seqnum += 1;
 445         for (i=0; i < session->global->num_channels; i++) {
 446                 struct smbXsrv_channel_global0 *_c =
 447                         &session->global->channels[i];
 448
 449                 _c->auth_session_info_seqnum =
 450                         session->global->auth_session_info_seqnum;
 451         }
 452         session->global->auth_time = timeval_to_nttime(&smb2req->request_time);
 453         session->global->expiration_time = gensec_expire_time(auth->gensec);
 454
 455         if (!session_claim(session)) {
 456                 DEBUG(1, ("smb2: Failed to claim session "
 457                         "for vuid=%llu\n",
 458                         (unsigned long long)session->compat->vuid));
 459                 return NT_STATUS_LOGON_FAILURE;
 460         }
 461
 462         TALLOC_FREE(auth);
 463         status = smbXsrv_session_update(session);
 464         if (!NT_STATUS_IS_OK(status)) {
 465                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 466                           (unsigned long long)session->compat->vuid,
 467                           nt_errstr(status)));
 468                 return NT_STATUS_LOGON_FAILURE;
 469         }
 470
 471         /*
 472          * we attach the session to the request
 473          * so that the response can be signed
 474          */
 475         if (!guest) {
 476                 smb2req->do_signing = true;
 477         }
 478
 479         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 480
 481         *out_session_id = session->global->session_wire_id;
 482
 483         return NT_STATUS_OK;
 484 }
 485
 486 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
 487                                         struct smbXsrv_session_auth0 **_auth,
 488                                         struct smbd_smb2_request *smb2req,
 489                                         struct auth_session_info *session_info,
 490                                         uint16_t *out_session_flags,
 491                                         uint64_t *out_session_id)
 492 {
 493         NTSTATUS status;
 494         struct smbXsrv_session *x = session;
 495         struct smbXsrv_session_auth0 *auth = *_auth;
 496         size_t i;
 497
 498         *_auth = NULL;
 499
 500         data_blob_clear_free(&session_info->session_key);
 501         session_info->session_key = data_blob_dup_talloc(session_info,
 502                                                 x->global->application_key);
 503         if (session_info->session_key.data == NULL) {
 504                 return NT_STATUS_NO_MEMORY;
 505         }
 506
 507         session->compat->session_info = session_info;
 508         session->compat->vuid = session->global->session_wire_id;
 509
 510         session->compat->homes_snum =
 511                         register_homes_share(session_info->unix_info->unix_name);
 512
 513         set_current_user_info(session_info->unix_info->sanitized_username,
 514                               session_info->unix_info->unix_name,
 515                               session_info->info->domain_name);
 516
 517         reload_services(smb2req->sconn, conn_snum_used, true);
 518
 519         session->status = NT_STATUS_OK;
 520         TALLOC_FREE(session->global->auth_session_info);
 521         session->global->auth_session_info = talloc_move(session->global,
 522                                                          &session_info);
 523         session->global->auth_session_info_seqnum += 1;
 524         for (i=0; i < session->global->num_channels; i++) {
 525                 struct smbXsrv_channel_global0 *_c =
 526                         &session->global->channels[i];
 527
 528                 _c->auth_session_info_seqnum =
 529                         session->global->auth_session_info_seqnum;
 530         }
 531         session->global->auth_time = timeval_to_nttime(&smb2req->request_time);
 532         session->global->expiration_time = gensec_expire_time(auth->gensec);
 533
 534         TALLOC_FREE(auth);
 535         status = smbXsrv_session_update(session);
 536         if (!NT_STATUS_IS_OK(status)) {
 537                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 538                           (unsigned long long)session->compat->vuid,
 539                           nt_errstr(status)));
 540                 return NT_STATUS_LOGON_FAILURE;
 541         }
 542
 543         conn_clear_vuid_caches(smb2req->sconn, session->compat->vuid);
 544
 545         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 546                 smb2req->do_signing = true;
 547         }
 548
 549         *out_session_id = session->global->session_wire_id;
 550
 551         return NT_STATUS_OK;
 552 }
 553
 554 struct smbd_smb2_session_setup_state {
 555         struct tevent_context *ev;
 556         struct smbd_smb2_request *smb2req;
 557         uint64_t in_session_id;
 558         uint8_t in_flags;
 559         uint8_t in_security_mode;
 560         uint64_t in_previous_session_id;
 561         DATA_BLOB in_security_buffer;
 562         struct smbXsrv_session *session;
 563         struct smbXsrv_session_auth0 *auth;
 564         struct auth_session_info *session_info;
 565         uint16_t out_session_flags;
 566         DATA_BLOB out_security_buffer;
 567         uint64_t out_session_id;
 568 };
 569
 570 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 571 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 572 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req);
 573
 574 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 575                                         struct tevent_context *ev,
 576                                         struct smbd_smb2_request *smb2req,
 577                                         uint64_t in_session_id,
 578                                         uint8_t in_flags,
 579                                         uint8_t in_security_mode,
 580                                         uint64_t in_previous_session_id,
 581                                         DATA_BLOB in_security_buffer)
 582 {
 583         struct tevent_req *req;
 584         struct smbd_smb2_session_setup_state *state;
 585         NTSTATUS status;
 586         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 587         struct tevent_req *subreq;
 588         struct smbXsrv_channel_global0 *c = NULL;
 589
 590         req = tevent_req_create(mem_ctx, &state,
 591                                 struct smbd_smb2_session_setup_state);
 592         if (req == NULL) {
 593                 return NULL;
 594         }
 595         state->ev = ev;
 596         state->smb2req = smb2req;
 597         state->in_session_id = in_session_id;
 598         state->in_flags = in_flags;
 599         state->in_security_mode = in_security_mode;
 600         state->in_previous_session_id = in_previous_session_id;
 601         state->in_security_buffer = in_security_buffer;
 602
 603         if (in_flags & SMB2_SESSION_FLAG_BINDING) {
 604                 if (smb2req->xconn->protocol < PROTOCOL_SMB2_22) {
 605                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 606                         return tevent_req_post(req, ev);
 607                 }
 608
 609                 /*
 610                  * We do not support multi channel.
 611                  */
 612                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 613                 return tevent_req_post(req, ev);
 614         }
 615
 616         if (state->in_session_id == 0) {
 617                 /* create a new session */
 618                 status = smbXsrv_session_create(state->smb2req->xconn,
 619                                                 now, &state->session);
 620                 if (tevent_req_nterror(req, status)) {
 621                         return tevent_req_post(req, ev);
 622                 }
 623                 smb2req->session = state->session;
 624         } else {
 625                 if (smb2req->session == NULL) {
 626                         tevent_req_nterror(req, NT_STATUS_USER_SESSION_DELETED);
 627                         return tevent_req_post(req, ev);
 628                 }
 629
 630                 state->session = smb2req->session;
 631                 status = state->session->status;
 632                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 633                         status = NT_STATUS_OK;
 634                 }
 635                 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 636                         status = NT_STATUS_OK;
 637                 }
 638                 if (tevent_req_nterror(req, status)) {
 639                         return tevent_req_post(req, ev);
 640                 }
 641                 if (!(in_flags & SMB2_SESSION_FLAG_BINDING)) {
 642                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 643                 }
 644         }
 645
 646         status = smbXsrv_session_find_channel(smb2req->session,
 647                                               smb2req->xconn, &c);
 648         if (!NT_STATUS_IS_OK(status)) {
 649                 tevent_req_nterror(req, status);
 650                 return tevent_req_post(req, ev);
 651         }
 652
 653         status = smbXsrv_session_find_auth(state->session, smb2req->xconn,
 654                                            now, &state->auth);
 655         if (!NT_STATUS_IS_OK(status)) {
 656                 status = smbXsrv_session_create_auth(state->session,
 657                                                      smb2req->xconn, now,
 658                                                      in_flags, in_security_mode,
 659                                                      &state->auth);
 660                 if (tevent_req_nterror(req, status)) {
 661                         return tevent_req_post(req, ev);
 662                 }
 663         }
 664
 665         if (state->auth->gensec == NULL) {
 666                 status = auth_generic_prepare(state->auth,
 667                                               state->smb2req->xconn->remote_address,
 668                                               &state->auth->gensec);
 669                 if (tevent_req_nterror(req, status)) {
 670                         return tevent_req_post(req, ev);
 671                 }
 672
 673                 gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_SESSION_KEY);
 674                 gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 675
 676                 status = gensec_start_mech_by_oid(state->auth->gensec,
 677                                                   GENSEC_OID_SPNEGO);
 678                 if (tevent_req_nterror(req, status)) {
 679                         return tevent_req_post(req, ev);
 680                 }
 681         }
 682
 683         status = smbXsrv_session_update(state->session);
 684         if (tevent_req_nterror(req, status)) {
 685                 return tevent_req_post(req, ev);
 686         }
 687
 688         become_root();
 689         subreq = gensec_update_send(state, state->ev,
 690                                     state->auth->gensec,
 691                                     state->in_security_buffer);
 692         unbecome_root();
 693         if (tevent_req_nomem(subreq, req)) {
 694                 return tevent_req_post(req, ev);
 695         }
 696         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 697
 698         return req;
 699 }
 700
 701 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 702 {
 703         struct tevent_req *req =
 704                 tevent_req_callback_data(subreq,
 705                 struct tevent_req);
 706         struct smbd_smb2_session_setup_state *state =
 707                 tevent_req_data(req,
 708                 struct smbd_smb2_session_setup_state);
 709         NTSTATUS status;
 710
 711         become_root();
 712         status = gensec_update_recv(subreq, state,
 713                                     &state->out_security_buffer);
 714         unbecome_root();
 715         TALLOC_FREE(subreq);
 716         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 717             !NT_STATUS_IS_OK(status)) {
 718                 tevent_req_nterror(req, status);
 719                 return;
 720         }
 721
 722         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 723                 state->out_session_id = state->session->global->session_wire_id;
 724                 state->smb2req->preauth = state->auth->preauth;
 725                 tevent_req_nterror(req, status);
 726                 return;
 727         }
 728
 729         status = gensec_session_info(state->auth->gensec,
 730                                      state,
 731                                      &state->session_info);
 732         if (tevent_req_nterror(req, status)) {
 733                 return;
 734         }
 735
 736         if ((state->in_previous_session_id != 0) &&
 737              (state->session->global->session_wire_id !=
 738               state->in_previous_session_id))
 739         {
 740                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 741                                                 state->smb2req->xconn,
 742                                                 state->session_info,
 743                                                 state->in_previous_session_id,
 744                                                 state->session->global->session_wire_id);
 745                 if (tevent_req_nomem(subreq, req)) {
 746                         return;
 747                 }
 748                 tevent_req_set_callback(subreq,
 749                                         smbd_smb2_session_setup_previous_done,
 750                                         req);
 751                 return;
 752         }
 753
 754         smbd_smb2_session_setup_auth_return(req);
 755 }
 756
 757 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 758 {
 759         struct tevent_req *req =
 760                 tevent_req_callback_data(subreq,
 761                 struct tevent_req);
 762         NTSTATUS status;
 763
 764         status = smb2srv_session_close_previous_recv(subreq);
 765         TALLOC_FREE(subreq);
 766         if (tevent_req_nterror(req, status)) {
 767                 return;
 768         }
 769
 770         smbd_smb2_session_setup_auth_return(req);
 771 }
 772
 773 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req)
 774 {
 775         struct smbd_smb2_session_setup_state *state =
 776                 tevent_req_data(req,
 777                 struct smbd_smb2_session_setup_state);
 778         NTSTATUS status;
 779
 780         if (state->session->global->auth_session_info != NULL) {
 781                 status = smbd_smb2_reauth_generic_return(state->session,
 782                                                          &state->auth,
 783                                                          state->smb2req,
 784                                                          state->session_info,
 785                                                          &state->out_session_flags,
 786                                                          &state->out_session_id);
 787                 if (tevent_req_nterror(req, status)) {
 788                         return;
 789                 }
 790                 tevent_req_done(req);
 791                 return;
 792         }
 793
 794         status = smbd_smb2_auth_generic_return(state->session,
 795                                                &state->auth,
 796                                                state->smb2req,
 797                                                state->in_security_mode,
 798                                                state->session_info,
 799                                                &state->out_session_flags,
 800                                                &state->out_session_id);
 801         if (tevent_req_nterror(req, status)) {
 802                 return;
 803         }
 804
 805         tevent_req_done(req);
 806         return;
 807 }
 808
 809 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 810                                         uint16_t *out_session_flags,
 811                                         TALLOC_CTX *mem_ctx,
 812                                         DATA_BLOB *out_security_buffer,
 813                                         uint64_t *out_session_id)
 814 {
 815         struct smbd_smb2_session_setup_state *state =
 816                 tevent_req_data(req,
 817                 struct smbd_smb2_session_setup_state);
 818         NTSTATUS status;
 819
 820         if (tevent_req_is_nterror(req, &status)) {
 821                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 822                         tevent_req_received(req);
 823                         return nt_status_squash(status);
 824                 }
 825         } else {
 826                 status = NT_STATUS_OK;
 827         }
 828
 829         *out_session_flags = state->out_session_flags;
 830         *out_security_buffer = state->out_security_buffer;
 831         *out_session_id = state->out_session_id;
 832
 833         talloc_steal(mem_ctx, out_security_buffer->data);
 834         tevent_req_received(req);
 835         return status;
 836 }
 837
 838 struct smbd_smb2_session_setup_wrap_state {
 839         struct tevent_context *ev;
 840         struct smbd_smb2_request *smb2req;
 841         uint64_t in_session_id;
 842         uint8_t in_flags;
 843         uint8_t in_security_mode;
 844         uint64_t in_previous_session_id;
 845         DATA_BLOB in_security_buffer;
 846         uint16_t out_session_flags;
 847         DATA_BLOB out_security_buffer;
 848         uint64_t out_session_id;
 849         NTSTATUS error;
 850 };
 851
 852 static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq);
 853 static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq);
 854
 855 static struct tevent_req *smbd_smb2_session_setup_wrap_send(TALLOC_CTX *mem_ctx,
 856                                         struct tevent_context *ev,
 857                                         struct smbd_smb2_request *smb2req,
 858                                         uint64_t in_session_id,
 859                                         uint8_t in_flags,
 860                                         uint8_t in_security_mode,
 861                                         uint64_t in_previous_session_id,
 862                                         DATA_BLOB in_security_buffer)
 863 {
 864         struct tevent_req *req;
 865         struct smbd_smb2_session_setup_wrap_state *state;
 866         struct tevent_req *subreq;
 867
 868         req = tevent_req_create(mem_ctx, &state,
 869                                 struct smbd_smb2_session_setup_wrap_state);
 870         if (req == NULL) {
 871                 return NULL;
 872         }
 873         state->ev = ev;
 874         state->smb2req = smb2req;
 875         state->in_session_id = in_session_id;
 876         state->in_flags = in_flags;
 877         state->in_security_mode = in_security_mode;
 878         state->in_previous_session_id = in_previous_session_id;
 879         state->in_security_buffer = in_security_buffer;
 880
 881         subreq = smbd_smb2_session_setup_send(state, state->ev,
 882                                               state->smb2req,
 883                                               state->in_session_id,
 884                                               state->in_flags,
 885                                               state->in_security_mode,
 886                                               state->in_previous_session_id,
 887                                               state->in_security_buffer);
 888         if (tevent_req_nomem(subreq, req)) {
 889                 return tevent_req_post(req, ev);
 890         }
 891         tevent_req_set_callback(subreq,
 892                                 smbd_smb2_session_setup_wrap_setup_done, req);
 893
 894         return req;
 895 }
 896
 897 static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq)
 898 {
 899         struct tevent_req *req =
 900                 tevent_req_callback_data(subreq,
 901                 struct tevent_req);
 902         struct smbd_smb2_session_setup_wrap_state *state =
 903                 tevent_req_data(req,
 904                 struct smbd_smb2_session_setup_wrap_state);
 905         NTSTATUS status;
 906
 907         status = smbd_smb2_session_setup_recv(subreq,
 908                                               &state->out_session_flags,
 909                                               state,
 910                                               &state->out_security_buffer,
 911                                               &state->out_session_id);
 912         TALLOC_FREE(subreq);
 913         if (NT_STATUS_IS_OK(status)) {
 914                 tevent_req_done(req);
 915                 return;
 916         }
 917         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 918                 tevent_req_nterror(req, status);
 919                 return;
 920         }
 921
 922         if (state->smb2req->session == NULL) {
 923                 tevent_req_nterror(req, status);
 924                 return;
 925         }
 926
 927         state->error = status;
 928
 929         subreq = smb2srv_session_shutdown_send(state, state->ev,
 930                                                state->smb2req->session,
 931                                                state->smb2req);
 932         if (tevent_req_nomem(subreq, req)) {
 933                 return;
 934         }
 935         tevent_req_set_callback(subreq,
 936                                 smbd_smb2_session_setup_wrap_shutdown_done,
 937                                 req);
 938 }
 939
 940 static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq)
 941 {
 942         struct tevent_req *req =
 943                 tevent_req_callback_data(subreq,
 944                 struct tevent_req);
 945         struct smbd_smb2_session_setup_wrap_state *state =
 946                 tevent_req_data(req,
 947                 struct smbd_smb2_session_setup_wrap_state);
 948         NTSTATUS status;
 949
 950         status = smb2srv_session_shutdown_recv(subreq);
 951         TALLOC_FREE(subreq);
 952         if (tevent_req_nterror(req, status)) {
 953                 return;
 954         }
 955
 956         /*
 957          * we may need to sign the response, so we need to keep
 958          * the session until the response is sent to the wire.
 959          */
 960         talloc_steal(state->smb2req, state->smb2req->session);
 961
 962         tevent_req_nterror(req, state->error);
 963 }
 964
 965 static NTSTATUS smbd_smb2_session_setup_wrap_recv(struct tevent_req *req,
 966                                         uint16_t *out_session_flags,
 967                                         TALLOC_CTX *mem_ctx,
 968                                         DATA_BLOB *out_security_buffer,
 969                                         uint64_t *out_session_id)
 970 {
 971         struct smbd_smb2_session_setup_wrap_state *state =
 972                 tevent_req_data(req,
 973                 struct smbd_smb2_session_setup_wrap_state);
 974         NTSTATUS status;
 975
 976         if (tevent_req_is_nterror(req, &status)) {
 977                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 978                         tevent_req_received(req);
 979                         return nt_status_squash(status);
 980                 }
 981         } else {
 982                 status = NT_STATUS_OK;
 983         }
 984
 985         *out_session_flags = state->out_session_flags;
 986         *out_security_buffer = state->out_security_buffer;
 987         *out_session_id = state->out_session_id;
 988
 989         talloc_steal(mem_ctx, out_security_buffer->data);
 990         tevent_req_received(req);
 991         return status;
 992 }
 993
 994 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 995                                         struct tevent_context *ev,
 996                                         struct smbd_smb2_request *smb2req);
 997 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req);
 998 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq);
 999
1000 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
1001 {
1002         NTSTATUS status;
1003         struct tevent_req *subreq = NULL;
1004
1005         status = smbd_smb2_request_verify_sizes(req, 0x04);
1006         if (!NT_STATUS_IS_OK(status)) {
1007                 return smbd_smb2_request_error(req, status);
1008         }
1009
1010         subreq = smbd_smb2_logoff_send(req, req->sconn->ev_ctx, req);
1011         if (subreq == NULL) {
1012                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
1013         }
1014         tevent_req_set_callback(subreq, smbd_smb2_request_logoff_done, req);
1015
1016         /*
1017          * Wait a long time before going async on this to allow
1018          * requests we're waiting on to finish. Set timeout to 10 secs.
1019          */
1020         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
1021 }
1022
1023 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq)
1024 {
1025         struct smbd_smb2_request *smb2req =
1026                 tevent_req_callback_data(subreq,
1027                 struct smbd_smb2_request);
1028         DATA_BLOB outbody;
1029         NTSTATUS status;
1030         NTSTATUS error;
1031
1032         status = smbd_smb2_logoff_recv(subreq);
1033         TALLOC_FREE(subreq);
1034         if (!NT_STATUS_IS_OK(status)) {
1035                 error = smbd_smb2_request_error(smb2req, status);
1036                 if (!NT_STATUS_IS_OK(error)) {
1037                         smbd_server_connection_terminate(smb2req->xconn,
1038                                                         nt_errstr(error));
1039                         return;
1040                 }
1041                 return;
1042         }
1043
1044         outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
1045         if (outbody.data == NULL) {
1046                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
1047                 if (!NT_STATUS_IS_OK(error)) {
1048                         smbd_server_connection_terminate(smb2req->xconn,
1049                                                         nt_errstr(error));
1050                         return;
1051                 }
1052                 return;
1053         }
1054
1055         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
1056         SSVAL(outbody.data, 0x02, 0);           /* reserved */
1057
1058         error = smbd_smb2_request_done(smb2req, outbody, NULL);
1059         if (!NT_STATUS_IS_OK(error)) {
1060                 smbd_server_connection_terminate(smb2req->xconn,
1061                                                 nt_errstr(error));
1062                 return;
1063         }
1064 }
1065
1066 struct smbd_smb2_logoff_state {
1067         struct smbd_smb2_request *smb2req;
1068 };
1069
1070 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq);
1071
1072 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
1073                                         struct tevent_context *ev,
1074                                         struct smbd_smb2_request *smb2req)
1075 {
1076         struct tevent_req *req;
1077         struct smbd_smb2_logoff_state *state;
1078         struct tevent_req *subreq;
1079
1080         req = tevent_req_create(mem_ctx, &state,
1081                         struct smbd_smb2_logoff_state);
1082         if (req == NULL) {
1083                 return NULL;
1084         }
1085         state->smb2req = smb2req;
1086
1087         subreq = smb2srv_session_shutdown_send(state, ev,
1088                                                smb2req->session,
1089                                                smb2req);
1090         if (tevent_req_nomem(subreq, req)) {
1091                 return tevent_req_post(req, ev);
1092         }
1093         tevent_req_set_callback(subreq, smbd_smb2_logoff_shutdown_done, req);
1094
1095         return req;
1096 }
1097
1098 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq)
1099 {
1100         struct tevent_req *req = tevent_req_callback_data(
1101                 subreq, struct tevent_req);
1102         struct smbd_smb2_logoff_state *state = tevent_req_data(
1103                 req, struct smbd_smb2_logoff_state);
1104         NTSTATUS status;
1105
1106         status = smb2srv_session_shutdown_recv(subreq);
1107         if (tevent_req_nterror(req, status)) {
1108                 return;
1109         }
1110         TALLOC_FREE(subreq);
1111
1112         /*
1113          * As we've been awoken, we may have changed
1114          * uid in the meantime. Ensure we're still
1115          * root (SMB2_OP_LOGOFF has .as_root = true).
1116          */
1117         change_to_root_user();
1118
1119         status = smbXsrv_session_logoff(state->smb2req->session);
1120         if (tevent_req_nterror(req, status)) {
1121                 return;
1122         }
1123
1124         /*
1125          * we may need to sign the response, so we need to keep
1126          * the session until the response is sent to the wire.
1127          */
1128         talloc_steal(state->smb2req, state->smb2req->session);
1129
1130         tevent_req_done(req);
1131 }
1132
1133 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req)
1134 {
1135         return tevent_req_simple_recv_ntstatus(req);
1136 }