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 "../libcli/auth/spnego.h"
  27 #include "../libcli/auth/ntlmssp.h"
  28 #include "../auth/gensec/gensec.h"
  29 #include "ntlmssp_wrap.h"
  30 #include "../librpc/gen_ndr/krb5pac.h"
  31 #include "libads/kerberos_proto.h"
  32 #include "../lib/util/asn1.h"
  33 #include "auth.h"
  34 #include "../lib/tsocket/tsocket.h"
  35 #include "../libcli/security/security.h"
  36
  37 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
  38                                         uint64_t in_session_id,
  39                                         uint8_t in_security_mode,
  40                                         DATA_BLOB in_security_buffer,
  41                                         uint16_t *out_session_flags,
  42                                         DATA_BLOB *out_security_buffer,
  43                                         uint64_t *out_session_id);
  44
  45 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
  46 {
  47         const uint8_t *inhdr;
  48         const uint8_t *inbody;
  49         int i = smb2req->current_idx;
  50         uint8_t *outhdr;
  51         DATA_BLOB outbody;
  52         DATA_BLOB outdyn;
  53         uint64_t in_session_id;
  54         uint8_t in_security_mode;
  55         uint16_t in_security_offset;
  56         uint16_t in_security_length;
  57         DATA_BLOB in_security_buffer;
  58         uint16_t out_session_flags;
  59         uint64_t out_session_id;
  60         uint16_t out_security_offset;
  61         DATA_BLOB out_security_buffer;
  62         NTSTATUS status;
  63
  64         status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
  65         if (!NT_STATUS_IS_OK(status)) {
  66                 return smbd_smb2_request_error(smb2req, status);
  67         }
  68         inhdr = (const uint8_t *)smb2req->in.vector[i+0].iov_base;
  69         inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
  70
  71         in_security_offset = SVAL(inbody, 0x0C);
  72         in_security_length = SVAL(inbody, 0x0E);
  73
  74         if (in_security_offset != (SMB2_HDR_BODY + smb2req->in.vector[i+1].iov_len)) {
  75                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  76         }
  77
  78         if (in_security_length > smb2req->in.vector[i+2].iov_len) {
  79                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  80         }
  81
  82         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  83         in_security_mode = CVAL(inbody, 0x03);
  84         in_security_buffer.data = (uint8_t *)smb2req->in.vector[i+2].iov_base;
  85         in_security_buffer.length = in_security_length;
  86
  87         status = smbd_smb2_session_setup(smb2req,
  88                                          in_session_id,
  89                                          in_security_mode,
  90                                          in_security_buffer,
  91                                          &out_session_flags,
  92                                          &out_security_buffer,
  93                                          &out_session_id);
  94         if (!NT_STATUS_IS_OK(status) &&
  95             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  96                 status = nt_status_squash(status);
  97                 return smbd_smb2_request_error(smb2req, status);
  98         }
  99
 100         out_security_offset = SMB2_HDR_BODY + 0x08;
 101
 102         outhdr = (uint8_t *)smb2req->out.vector[i].iov_base;
 103
 104         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
 105         if (outbody.data == NULL) {
 106                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 107         }
 108
 109         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 110
 111         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 112         SSVAL(outbody.data, 0x02,
 113               out_session_flags);               /* session flags */
 114         SSVAL(outbody.data, 0x04,
 115               out_security_offset);             /* security buffer offset */
 116         SSVAL(outbody.data, 0x06,
 117               out_security_buffer.length);      /* security buffer length */
 118
 119         outdyn = out_security_buffer;
 120
 121         return smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 122                                          __location__);
 123 }
 124
 125 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
 126 {
 127         if (session->sconn == NULL) {
 128                 return 0;
 129         }
 130
 131         /* first free all tcons */
 132         while (session->tcons.list) {
 133                 talloc_free(session->tcons.list);
 134         }
 135
 136         idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
 137         DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
 138         invalidate_vuid(session->sconn, session->vuid);
 139
 140         session->vuid = 0;
 141         session->status = NT_STATUS_USER_SESSION_DELETED;
 142         session->sconn = NULL;
 143
 144         return 0;
 145 }
 146
 147 #ifdef HAVE_KRB5
 148 static NTSTATUS smbd_smb2_session_setup_krb5(struct smbd_smb2_session *session,
 149                                         struct smbd_smb2_request *smb2req,
 150                                         uint8_t in_security_mode,
 151                                         const DATA_BLOB *secblob,
 152                                         const char *mechOID,
 153                                         uint16_t *out_session_flags,
 154                                         DATA_BLOB *out_security_buffer,
 155                                         uint64_t *out_session_id)
 156 {
 157         DATA_BLOB ap_rep = data_blob_null;
 158         DATA_BLOB ap_rep_wrapped = data_blob_null;
 159         DATA_BLOB ticket = data_blob_null;
 160         DATA_BLOB session_key = data_blob_null;
 161         DATA_BLOB secblob_out = data_blob_null;
 162         uint8 tok_id[2];
 163         struct PAC_LOGON_INFO *logon_info = NULL;
 164         char *principal = NULL;
 165         char *user = NULL;
 166         char *domain = NULL;
 167         struct passwd *pw = NULL;
 168         NTSTATUS status;
 169         char *real_username;
 170         bool username_was_mapped = false;
 171         bool map_domainuser_to_guest = false;
 172
 173         if (!spnego_parse_krb5_wrap(talloc_tos(), *secblob, &ticket, tok_id)) {
 174                 status = NT_STATUS_LOGON_FAILURE;
 175                 goto fail;
 176         }
 177
 178         status = ads_verify_ticket(smb2req, lp_realm(), 0, &ticket,
 179                                    &principal, &logon_info, &ap_rep,
 180                                    &session_key, true);
 181
 182         if (!NT_STATUS_IS_OK(status)) {
 183                 DEBUG(1,("smb2: Failed to verify incoming ticket with error %s!\n",
 184                         nt_errstr(status)));
 185                 if (!NT_STATUS_EQUAL(status, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 186                         status = NT_STATUS_LOGON_FAILURE;
 187                 }
 188                 goto fail;
 189         }
 190
 191         status = get_user_from_kerberos_info(talloc_tos(),
 192                                              session->sconn->remote_hostname,
 193                                              principal, logon_info,
 194                                              &username_was_mapped,
 195                                              &map_domainuser_to_guest,
 196                                              &user, &domain,
 197                                              &real_username, &pw);
 198         if (!NT_STATUS_IS_OK(status)) {
 199                 goto fail;
 200         }
 201
 202         /* save the PAC data if we have it */
 203         if (logon_info) {
 204                 netsamlogon_cache_store(user, &logon_info->info3);
 205         }
 206
 207         /* setup the string used by %U */
 208         sub_set_smb_name(real_username);
 209
 210         /* reload services so that the new %U is taken into account */
 211         reload_services(smb2req->sconn->msg_ctx, smb2req->sconn->sock, true);
 212
 213         status = make_session_info_krb5(session,
 214                                         user, domain, real_username, pw,
 215                                         logon_info, map_domainuser_to_guest,
 216                                         username_was_mapped,
 217                                         &session_key,
 218                                         &session->session_info);
 219         if (!NT_STATUS_IS_OK(status)) {
 220                 DEBUG(1, ("smb2: make_server_info_krb5 failed\n"));
 221                 goto fail;
 222         }
 223
 224         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 225              lp_server_signing() == Required) {
 226                 session->do_signing = true;
 227         }
 228
 229         if (security_session_user_level(session->session_info, NULL) < SECURITY_USER) {
 230                 /* we map anonymous to guest internally */
 231                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 232                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 233                 /* force no signing */
 234                 session->do_signing = false;
 235         }
 236
 237         session->session_key = session->session_info->session_key;
 238
 239         session->compat_vuser = talloc_zero(session, user_struct);
 240         if (session->compat_vuser == NULL) {
 241                 status = NT_STATUS_NO_MEMORY;
 242                 goto fail;
 243         }
 244         session->compat_vuser->auth_ntlmssp_state = NULL;
 245         session->compat_vuser->homes_snum = -1;
 246         session->compat_vuser->session_info = session->session_info;
 247         session->compat_vuser->session_keystr = NULL;
 248         session->compat_vuser->vuid = session->vuid;
 249         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 250
 251         if (security_session_user_level(session->session_info, NULL) >= SECURITY_USER) {
 252                 session->compat_vuser->homes_snum =
 253                         register_homes_share(session->session_info->unix_info->unix_name);
 254         }
 255
 256         if (!session_claim(session->sconn, session->compat_vuser)) {
 257                 DEBUG(1, ("smb2: Failed to claim session "
 258                         "for vuid=%d\n",
 259                         session->compat_vuser->vuid));
 260                 goto fail;
 261         }
 262
 263         session->status = NT_STATUS_OK;
 264
 265         /*
 266          * we attach the session to the request
 267          * so that the response can be signed
 268          */
 269         smb2req->session = session;
 270         if (session->do_signing) {
 271                 smb2req->do_signing = true;
 272         }
 273
 274         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 275         status = NT_STATUS_OK;
 276
 277         /* wrap that up in a nice GSS-API wrapping */
 278         ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
 279                                 TOK_ID_KRB_AP_REP);
 280
 281         secblob_out = spnego_gen_auth_response(
 282                                         talloc_tos(),
 283                                         &ap_rep_wrapped,
 284                                         status,
 285                                         mechOID);
 286
 287         *out_security_buffer = data_blob_talloc(smb2req,
 288                                                 secblob_out.data,
 289                                                 secblob_out.length);
 290         if (secblob_out.data && out_security_buffer->data == NULL) {
 291                 status = NT_STATUS_NO_MEMORY;
 292                 goto fail;
 293         }
 294
 295         data_blob_free(&ap_rep);
 296         data_blob_free(&ap_rep_wrapped);
 297         data_blob_free(&ticket);
 298         data_blob_free(&session_key);
 299         data_blob_free(&secblob_out);
 300
 301         *out_session_id = session->vuid;
 302
 303         return NT_STATUS_OK;
 304
 305   fail:
 306
 307         data_blob_free(&ap_rep);
 308         data_blob_free(&ap_rep_wrapped);
 309         data_blob_free(&ticket);
 310         data_blob_free(&session_key);
 311         data_blob_free(&secblob_out);
 312
 313         ap_rep_wrapped = data_blob_null;
 314         secblob_out = spnego_gen_auth_response(
 315                                         talloc_tos(),
 316                                         &ap_rep_wrapped,
 317                                         status,
 318                                         mechOID);
 319
 320         *out_security_buffer = data_blob_talloc(smb2req,
 321                                                 secblob_out.data,
 322                                                 secblob_out.length);
 323         data_blob_free(&secblob_out);
 324         return status;
 325 }
 326 #endif
 327
 328 static NTSTATUS smbd_smb2_spnego_negotiate(struct smbd_smb2_session *session,
 329                                         struct smbd_smb2_request *smb2req,
 330                                         uint8_t in_security_mode,
 331                                         DATA_BLOB in_security_buffer,
 332                                         uint16_t *out_session_flags,
 333                                         DATA_BLOB *out_security_buffer,
 334                                         uint64_t *out_session_id)
 335 {
 336         DATA_BLOB secblob_in = data_blob_null;
 337         DATA_BLOB chal_out = data_blob_null;
 338         char *kerb_mech = NULL;
 339         NTSTATUS status;
 340
 341         /* Ensure we have no old NTLM state around. */
 342         TALLOC_FREE(session->auth_ntlmssp_state);
 343
 344         status = parse_spnego_mechanisms(talloc_tos(), in_security_buffer,
 345                         &secblob_in, &kerb_mech);
 346         if (!NT_STATUS_IS_OK(status)) {
 347                 goto out;
 348         }
 349
 350 #ifdef HAVE_KRB5
 351         if (kerb_mech && ((lp_security()==SEC_ADS) ||
 352                                 USE_KERBEROS_KEYTAB) ) {
 353                 status = smbd_smb2_session_setup_krb5(session,
 354                                 smb2req,
 355                                 in_security_mode,
 356                                 &secblob_in,
 357                                 kerb_mech,
 358                                 out_session_flags,
 359                                 out_security_buffer,
 360                                 out_session_id);
 361
 362                 goto out;
 363         }
 364 #endif
 365
 366         if (kerb_mech) {
 367                 /* The mechtoken is a krb5 ticket, but
 368                  * we need to fall back to NTLM. */
 369
 370                 DEBUG(3,("smb2: Got krb5 ticket in SPNEGO "
 371                         "but set to downgrade to NTLMSSP\n"));
 372
 373                 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 374         } else {
 375                 /* Fall back to NTLMSSP. */
 376                 status = auth_ntlmssp_prepare(session->sconn->remote_address,
 377                                             &session->auth_ntlmssp_state);
 378                 if (!NT_STATUS_IS_OK(status)) {
 379                         goto out;
 380                 }
 381
 382                 auth_ntlmssp_want_feature(session->auth_ntlmssp_state, NTLMSSP_FEATURE_SESSION_KEY);
 383
 384                 status = auth_ntlmssp_start(session->auth_ntlmssp_state);
 385                 if (!NT_STATUS_IS_OK(status)) {
 386                         goto out;
 387                 }
 388
 389                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 390                                              talloc_tos(),
 391                                              secblob_in,
 392                                              &chal_out);
 393         }
 394
 395         if (!NT_STATUS_IS_OK(status) &&
 396                         !NT_STATUS_EQUAL(status,
 397                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 398                 goto out;
 399         }
 400
 401         *out_security_buffer = spnego_gen_auth_response(smb2req,
 402                                                 &chal_out,
 403                                                 status,
 404                                                 OID_NTLMSSP);
 405         if (out_security_buffer->data == NULL) {
 406                 status = NT_STATUS_NO_MEMORY;
 407                 goto out;
 408         }
 409         *out_session_id = session->vuid;
 410
 411   out:
 412
 413         data_blob_free(&secblob_in);
 414         data_blob_free(&chal_out);
 415         TALLOC_FREE(kerb_mech);
 416         if (!NT_STATUS_IS_OK(status) &&
 417                         !NT_STATUS_EQUAL(status,
 418                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 419                 TALLOC_FREE(session->auth_ntlmssp_state);
 420                 TALLOC_FREE(session);
 421         }
 422         return status;
 423 }
 424
 425 static NTSTATUS smbd_smb2_common_ntlmssp_auth_return(struct smbd_smb2_session *session,
 426                                         struct smbd_smb2_request *smb2req,
 427                                         uint8_t in_security_mode,
 428                                         DATA_BLOB in_security_buffer,
 429                                         uint16_t *out_session_flags,
 430                                         uint64_t *out_session_id)
 431 {
 432         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 433             lp_server_signing() == Required) {
 434                 session->do_signing = true;
 435         }
 436
 437         if (security_session_user_level(session->session_info, NULL) < SECURITY_USER) {
 438                 /* we map anonymous to guest internally */
 439                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 440                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 441                 /* force no signing */
 442                 session->do_signing = false;
 443         }
 444
 445         session->session_key = session->session_info->session_key;
 446
 447         session->compat_vuser = talloc_zero(session, user_struct);
 448         if (session->compat_vuser == NULL) {
 449                 TALLOC_FREE(session->auth_ntlmssp_state);
 450                 TALLOC_FREE(session);
 451                 return NT_STATUS_NO_MEMORY;
 452         }
 453         session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
 454         session->compat_vuser->homes_snum = -1;
 455         session->compat_vuser->session_info = session->session_info;
 456         session->compat_vuser->session_keystr = NULL;
 457         session->compat_vuser->vuid = session->vuid;
 458         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 459
 460         if (security_session_user_level(session->session_info, NULL) >= SECURITY_USER) {
 461                 session->compat_vuser->homes_snum =
 462                         register_homes_share(session->session_info->unix_info->unix_name);
 463         }
 464
 465         if (!session_claim(session->sconn, session->compat_vuser)) {
 466                 DEBUG(1, ("smb2: Failed to claim session "
 467                         "for vuid=%d\n",
 468                         session->compat_vuser->vuid));
 469                 TALLOC_FREE(session->auth_ntlmssp_state);
 470                 TALLOC_FREE(session);
 471                 return NT_STATUS_LOGON_FAILURE;
 472         }
 473
 474
 475         session->status = NT_STATUS_OK;
 476
 477         /*
 478          * we attach the session to the request
 479          * so that the response can be signed
 480          */
 481         smb2req->session = session;
 482         if (session->do_signing) {
 483                 smb2req->do_signing = true;
 484         }
 485
 486         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 487
 488         *out_session_id = session->vuid;
 489
 490         return NT_STATUS_OK;
 491 }
 492
 493 static NTSTATUS smbd_smb2_spnego_auth(struct smbd_smb2_session *session,
 494                                         struct smbd_smb2_request *smb2req,
 495                                         uint8_t in_security_mode,
 496                                         DATA_BLOB in_security_buffer,
 497                                         uint16_t *out_session_flags,
 498                                         DATA_BLOB *out_security_buffer,
 499                                         uint64_t *out_session_id)
 500 {
 501         DATA_BLOB auth = data_blob_null;
 502         DATA_BLOB auth_out = data_blob_null;
 503         NTSTATUS status;
 504
 505         if (!spnego_parse_auth(talloc_tos(), in_security_buffer, &auth)) {
 506                 TALLOC_FREE(session);
 507                 return NT_STATUS_LOGON_FAILURE;
 508         }
 509
 510         if (auth.data[0] == ASN1_APPLICATION(0)) {
 511                 /* Might be a second negTokenTarg packet */
 512                 DATA_BLOB secblob_in = data_blob_null;
 513                 char *kerb_mech = NULL;
 514
 515                 status = parse_spnego_mechanisms(talloc_tos(),
 516                                 in_security_buffer,
 517                                 &secblob_in, &kerb_mech);
 518                 if (!NT_STATUS_IS_OK(status)) {
 519                         TALLOC_FREE(session);
 520                         return status;
 521                 }
 522
 523 #ifdef HAVE_KRB5
 524                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 525                                         USE_KERBEROS_KEYTAB) ) {
 526                         status = smbd_smb2_session_setup_krb5(session,
 527                                         smb2req,
 528                                         in_security_mode,
 529                                         &secblob_in,
 530                                         kerb_mech,
 531                                         out_session_flags,
 532                                         out_security_buffer,
 533                                         out_session_id);
 534
 535                         data_blob_free(&secblob_in);
 536                         TALLOC_FREE(kerb_mech);
 537                         if (!NT_STATUS_IS_OK(status)) {
 538                                 TALLOC_FREE(session);
 539                         }
 540                         return status;
 541                 }
 542 #endif
 543
 544                 /* Can't blunder into NTLMSSP auth if we have
 545                  * a krb5 ticket. */
 546
 547                 if (kerb_mech) {
 548                         DEBUG(3,("smb2: network "
 549                                 "misconfiguration, client sent us a "
 550                                 "krb5 ticket and kerberos security "
 551                                 "not enabled\n"));
 552                         TALLOC_FREE(session);
 553                         data_blob_free(&secblob_in);
 554                         TALLOC_FREE(kerb_mech);
 555                         return NT_STATUS_LOGON_FAILURE;
 556                 }
 557
 558                 data_blob_free(&secblob_in);
 559         }
 560
 561         if (session->auth_ntlmssp_state == NULL) {
 562                 status = auth_ntlmssp_prepare(session->sconn->remote_address,
 563                                             &session->auth_ntlmssp_state);
 564                 if (!NT_STATUS_IS_OK(status)) {
 565                         data_blob_free(&auth);
 566                         TALLOC_FREE(session);
 567                         return status;
 568                 }
 569
 570                 auth_ntlmssp_want_feature(session->auth_ntlmssp_state, NTLMSSP_FEATURE_SESSION_KEY);
 571
 572                 status = auth_ntlmssp_start(session->auth_ntlmssp_state);
 573                 if (!NT_STATUS_IS_OK(status)) {
 574                         data_blob_free(&auth);
 575                         TALLOC_FREE(session);
 576                         return status;
 577                 }
 578         }
 579
 580         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 581                                      talloc_tos(), auth,
 582                                      &auth_out);
 583         /* If status is NT_STATUS_OK then we need to get the token.
 584          * Map to guest is now internal to auth_ntlmssp */
 585         if (NT_STATUS_IS_OK(status)) {
 586                 status = auth_ntlmssp_session_info(session,
 587                                                    session->auth_ntlmssp_state,
 588                                                    &session->session_info);
 589         }
 590
 591         if (!NT_STATUS_IS_OK(status) &&
 592                         !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 593                 TALLOC_FREE(session->auth_ntlmssp_state);
 594                 data_blob_free(&auth);
 595                 TALLOC_FREE(session);
 596                 return status;
 597         }
 598
 599         data_blob_free(&auth);
 600
 601         *out_security_buffer = spnego_gen_auth_response(smb2req,
 602                                 &auth_out, status, NULL);
 603
 604         if (out_security_buffer->data == NULL) {
 605                 TALLOC_FREE(session->auth_ntlmssp_state);
 606                 TALLOC_FREE(session);
 607                 return NT_STATUS_NO_MEMORY;
 608         }
 609
 610         *out_session_id = session->vuid;
 611
 612         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 613                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 614         }
 615
 616         /* We're done - claim the session. */
 617         return smbd_smb2_common_ntlmssp_auth_return(session,
 618                                                 smb2req,
 619                                                 in_security_mode,
 620                                                 in_security_buffer,
 621                                                 out_session_flags,
 622                                                 out_session_id);
 623 }
 624
 625 static NTSTATUS smbd_smb2_raw_ntlmssp_auth(struct smbd_smb2_session *session,
 626                                         struct smbd_smb2_request *smb2req,
 627                                         uint8_t in_security_mode,
 628                                         DATA_BLOB in_security_buffer,
 629                                         uint16_t *out_session_flags,
 630                                         DATA_BLOB *out_security_buffer,
 631                                         uint64_t *out_session_id)
 632 {
 633         NTSTATUS status;
 634
 635         if (session->auth_ntlmssp_state == NULL) {
 636                 status = auth_ntlmssp_prepare(session->sconn->remote_address,
 637                                             &session->auth_ntlmssp_state);
 638                 if (!NT_STATUS_IS_OK(status)) {
 639                         TALLOC_FREE(session);
 640                         return status;
 641                 }
 642
 643                 auth_ntlmssp_want_feature(session->auth_ntlmssp_state, NTLMSSP_FEATURE_SESSION_KEY);
 644
 645                 if (session->sconn->use_gensec_hook) {
 646                         status = auth_generic_start(session->auth_ntlmssp_state, GENSEC_OID_SPNEGO);
 647                 } else {
 648                         status = auth_ntlmssp_start(session->auth_ntlmssp_state);
 649                 }
 650                 if (!NT_STATUS_IS_OK(status)) {
 651                         TALLOC_FREE(session);
 652                         return status;
 653                 }
 654         }
 655
 656         /* RAW NTLMSSP */
 657         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 658                                      smb2req,
 659                                      in_security_buffer,
 660                                      out_security_buffer);
 661
 662         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 663                 *out_session_id = session->vuid;
 664                 return status;
 665         }
 666
 667         status = auth_ntlmssp_session_info(session,
 668                                            session->auth_ntlmssp_state,
 669                                            &session->session_info);
 670
 671         if (!NT_STATUS_IS_OK(status)) {
 672                 TALLOC_FREE(session->auth_ntlmssp_state);
 673                 TALLOC_FREE(session);
 674                 return status;
 675         }
 676         *out_session_id = session->vuid;
 677
 678         return smbd_smb2_common_ntlmssp_auth_return(session,
 679                                                 smb2req,
 680                                                 in_security_mode,
 681                                                 in_security_buffer,
 682                                                 out_session_flags,
 683                                                 out_session_id);
 684 }
 685
 686 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
 687                                         uint64_t in_session_id,
 688                                         uint8_t in_security_mode,
 689                                         DATA_BLOB in_security_buffer,
 690                                         uint16_t *out_session_flags,
 691                                         DATA_BLOB *out_security_buffer,
 692                                         uint64_t *out_session_id)
 693 {
 694         struct smbd_smb2_session *session;
 695
 696         *out_session_flags = 0;
 697         *out_session_id = 0;
 698
 699         if (in_session_id == 0) {
 700                 int id;
 701
 702                 /* create a new session */
 703                 session = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
 704                 if (session == NULL) {
 705                         return NT_STATUS_NO_MEMORY;
 706                 }
 707                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 708                 id = idr_get_new_random(smb2req->sconn->smb2.sessions.idtree,
 709                                         session,
 710                                         smb2req->sconn->smb2.sessions.limit);
 711                 if (id == -1) {
 712                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 713                 }
 714                 session->vuid = id;
 715
 716                 session->tcons.idtree = idr_init(session);
 717                 if (session->tcons.idtree == NULL) {
 718                         return NT_STATUS_NO_MEMORY;
 719                 }
 720                 session->tcons.limit = 0x0000FFFE;
 721                 session->tcons.list = NULL;
 722
 723                 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, session,
 724                               struct smbd_smb2_session *);
 725                 session->sconn = smb2req->sconn;
 726                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 727         } else {
 728                 void *p;
 729
 730                 /* lookup an existing session */
 731                 p = idr_find(smb2req->sconn->smb2.sessions.idtree, in_session_id);
 732                 if (p == NULL) {
 733                         return NT_STATUS_USER_SESSION_DELETED;
 734                 }
 735                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 736         }
 737
 738         if (NT_STATUS_IS_OK(session->status)) {
 739                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 740         }
 741
 742         /* Handle either raw NTLMSSP or hand off the whole blob to
 743          * GENSEC.  The processing at this layer is essentially
 744          * identical regardless.  In particular, both rely only on the
 745          * status code (not the contents of the packet) and do not
 746          * wrap the result */
 747         if (session->sconn->use_gensec_hook
 748             || ntlmssp_blob_matches_magic(&in_security_buffer)) {
 749                 return smbd_smb2_raw_ntlmssp_auth(session,
 750                                                 smb2req,
 751                                                 in_security_mode,
 752                                                 in_security_buffer,
 753                                                 out_session_flags,
 754                                                 out_security_buffer,
 755                                                 out_session_id);
 756         } else if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
 757                 return smbd_smb2_spnego_negotiate(session,
 758                                                 smb2req,
 759                                                 in_security_mode,
 760                                                 in_security_buffer,
 761                                                 out_session_flags,
 762                                                 out_security_buffer,
 763                                                 out_session_id);
 764         } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
 765                 return smbd_smb2_spnego_auth(session,
 766                                                 smb2req,
 767                                                 in_security_mode,
 768                                                 in_security_buffer,
 769                                                 out_session_flags,
 770                                                 out_security_buffer,
 771                                                 out_session_id);
 772         }
 773
 774         /* Unknown packet type. */
 775         DEBUG(1,("Unknown packet type %u in smb2 sessionsetup\n",
 776                 (unsigned int)in_security_buffer.data[0] ));
 777         TALLOC_FREE(session->auth_ntlmssp_state);
 778         TALLOC_FREE(session);
 779         return NT_STATUS_LOGON_FAILURE;
 780 }
 781
 782 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 783 {
 784         NTSTATUS status;
 785         DATA_BLOB outbody;
 786
 787         status = smbd_smb2_request_verify_sizes(req, 0x04);
 788         if (!NT_STATUS_IS_OK(status)) {
 789                 return smbd_smb2_request_error(req, status);
 790         }
 791
 792         /*
 793          * TODO: cancel all outstanding requests on the session
 794          *       and delete all tree connections.
 795          */
 796         smbd_smb2_session_destructor(req->session);
 797         /*
 798          * we may need to sign the response, so we need to keep
 799          * the session until the response is sent to the wire.
 800          */
 801         talloc_steal(req, req->session);
 802
 803         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 804         if (outbody.data == NULL) {
 805                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 806         }
 807
 808         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 809         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 810
 811         return smbd_smb2_request_done(req, outbody, NULL);
 812 }