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