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 "ntlmssp_wrap.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
  34 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
  35                                         uint64_t in_session_id,
  36                                         uint8_t in_security_mode,
  37                                         DATA_BLOB in_security_buffer,
  38                                         uint16_t *out_session_flags,
  39                                         DATA_BLOB *out_security_buffer,
  40                                         uint64_t *out_session_id);
  41
  42 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
  43 {
  44         const uint8_t *inhdr;
  45         const uint8_t *inbody;
  46         int i = smb2req->current_idx;
  47         uint8_t *outhdr;
  48         DATA_BLOB outbody;
  49         DATA_BLOB outdyn;
  50         size_t expected_body_size = 0x19;
  51         size_t body_size;
  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;
  61         NTSTATUS status;
  62
  63         inhdr = (const uint8_t *)smb2req->in.vector[i+0].iov_base;
  64
  65         if (smb2req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  66                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  67         }
  68
  69         inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
  70
  71         body_size = SVAL(inbody, 0x00);
  72         if (body_size != expected_body_size) {
  73                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  74         }
  75
  76         in_security_offset = SVAL(inbody, 0x0C);
  77         in_security_length = SVAL(inbody, 0x0E);
  78
  79         if (in_security_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  80                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  81         }
  82
  83         if (in_security_length > smb2req->in.vector[i+2].iov_len) {
  84                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  85         }
  86
  87         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  88         in_security_mode = CVAL(inbody, 0x03);
  89         in_security_buffer.data = (uint8_t *)smb2req->in.vector[i+2].iov_base;
  90         in_security_buffer.length = in_security_length;
  91
  92         status = smbd_smb2_session_setup(smb2req,
  93                                          in_session_id,
  94                                          in_security_mode,
  95                                          in_security_buffer,
  96                                          &out_session_flags,
  97                                          &out_security_buffer,
  98                                          &out_session_id);
  99         if (!NT_STATUS_IS_OK(status) &&
 100             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 101                 status = nt_status_squash(status);
 102                 return smbd_smb2_request_error(smb2req, status);
 103         }
 104
 105         out_security_offset = SMB2_HDR_BODY + 0x08;
 106
 107         outhdr = (uint8_t *)smb2req->out.vector[i].iov_base;
 108
 109         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
 110         if (outbody.data == NULL) {
 111                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 112         }
 113
 114         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 115
 116         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 117         SSVAL(outbody.data, 0x02,
 118               out_session_flags);               /* session flags */
 119         SSVAL(outbody.data, 0x04,
 120               out_security_offset);             /* security buffer offset */
 121         SSVAL(outbody.data, 0x06,
 122               out_security_buffer.length);      /* security buffer length */
 123
 124         outdyn = out_security_buffer;
 125
 126         return smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 127                                          __location__);
 128 }
 129
 130 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
 131 {
 132         if (session->sconn == NULL) {
 133                 return 0;
 134         }
 135
 136         /* first free all tcons */
 137         while (session->tcons.list) {
 138                 talloc_free(session->tcons.list);
 139         }
 140
 141         idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
 142         DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
 143         invalidate_vuid(session->sconn, session->vuid);
 144
 145         session->vuid = 0;
 146         session->status = NT_STATUS_USER_SESSION_DELETED;
 147         session->sconn = NULL;
 148
 149         return 0;
 150 }
 151
 152 static NTSTATUS setup_ntlmssp_session_info(struct smbd_smb2_session *session,
 153                                 NTSTATUS status)
 154 {
 155         if (NT_STATUS_IS_OK(status)) {
 156                 status = auth_ntlmssp_steal_session_info(session,
 157                                 session->auth_ntlmssp_state,
 158                                 &session->session_info);
 159         } else {
 160                 /* Note that this session_info won't have a session
 161                  * key.  But for map to guest, that's exactly the right
 162                  * thing - we can't reasonably guess the key the
 163                  * client wants, as the password was wrong */
 164                 status = do_map_to_guest(status,
 165                         &session->session_info,
 166                         auth_ntlmssp_get_username(session->auth_ntlmssp_state),
 167                         auth_ntlmssp_get_domain(session->auth_ntlmssp_state));
 168         }
 169         return status;
 170 }
 171
 172 #ifdef HAVE_KRB5
 173 static NTSTATUS smbd_smb2_session_setup_krb5(struct smbd_smb2_session *session,
 174                                         struct smbd_smb2_request *smb2req,
 175                                         uint8_t in_security_mode,
 176                                         const DATA_BLOB *secblob,
 177                                         const char *mechOID,
 178                                         uint16_t *out_session_flags,
 179                                         DATA_BLOB *out_security_buffer,
 180                                         uint64_t *out_session_id)
 181 {
 182         DATA_BLOB ap_rep = data_blob_null;
 183         DATA_BLOB ap_rep_wrapped = data_blob_null;
 184         DATA_BLOB ticket = data_blob_null;
 185         DATA_BLOB session_key = data_blob_null;
 186         DATA_BLOB secblob_out = data_blob_null;
 187         uint8 tok_id[2];
 188         struct PAC_LOGON_INFO *logon_info = NULL;
 189         char *principal = NULL;
 190         char *user = NULL;
 191         char *domain = NULL;
 192         struct passwd *pw = NULL;
 193         NTSTATUS status;
 194         char *real_username;
 195         fstring tmp;
 196         bool username_was_mapped = false;
 197         bool map_domainuser_to_guest = false;
 198
 199         if (!spnego_parse_krb5_wrap(talloc_tos(), *secblob, &ticket, tok_id)) {
 200                 status = NT_STATUS_LOGON_FAILURE;
 201                 goto fail;
 202         }
 203
 204         status = ads_verify_ticket(smb2req, lp_realm(), 0, &ticket,
 205                                    &principal, &logon_info, &ap_rep,
 206                                    &session_key, true);
 207
 208         if (!NT_STATUS_IS_OK(status)) {
 209                 DEBUG(1,("smb2: Failed to verify incoming ticket with error %s!\n",
 210                         nt_errstr(status)));
 211                 if (!NT_STATUS_EQUAL(status, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 212                         status = NT_STATUS_LOGON_FAILURE;
 213                 }
 214                 goto fail;
 215         }
 216
 217         status = get_user_from_kerberos_info(talloc_tos(),
 218                                              smb2req->sconn->client_id.name,
 219                                              principal, logon_info,
 220                                              &username_was_mapped,
 221                                              &map_domainuser_to_guest,
 222                                              &user, &domain,
 223                                              &real_username, &pw);
 224         if (!NT_STATUS_IS_OK(status)) {
 225                 goto fail;
 226         }
 227
 228         /* save the PAC data if we have it */
 229         if (logon_info) {
 230                 netsamlogon_cache_store(user, &logon_info->info3);
 231         }
 232
 233         /* setup the string used by %U */
 234         sub_set_smb_name(real_username);
 235
 236         /* reload services so that the new %U is taken into account */
 237         reload_services(smb2req->sconn->msg_ctx, smb2req->sconn->sock, true);
 238
 239         status = make_session_info_krb5(session,
 240                                         user, domain, real_username, pw,
 241                                         logon_info, map_domainuser_to_guest,
 242                                         username_was_mapped,
 243                                         &session_key,
 244                                         &session->session_info);
 245         if (!NT_STATUS_IS_OK(status)) {
 246                 DEBUG(1, ("smb2: make_server_info_krb5 failed\n"));
 247                 goto fail;
 248         }
 249
 250         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 251              lp_server_signing() == Required) {
 252                 session->do_signing = true;
 253         }
 254
 255         if (session->session_info->guest) {
 256                 /* we map anonymous to guest internally */
 257                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 258                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 259                 /* force no signing */
 260                 session->do_signing = false;
 261         }
 262
 263         session->session_key = session->session_info->session_key;
 264
 265         session->compat_vuser = talloc_zero(session, user_struct);
 266         if (session->compat_vuser == NULL) {
 267                 status = NT_STATUS_NO_MEMORY;
 268                 goto fail;
 269         }
 270         session->compat_vuser->auth_ntlmssp_state = NULL;
 271         session->compat_vuser->homes_snum = -1;
 272         session->compat_vuser->session_info = session->session_info;
 273         session->compat_vuser->session_keystr = NULL;
 274         session->compat_vuser->vuid = session->vuid;
 275         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 276
 277         /* This is a potentially untrusted username */
 278         alpha_strcpy(tmp, user, ". _-$", sizeof(tmp));
 279         session->session_info->sanitized_username =
 280                                 talloc_strdup(session->session_info, tmp);
 281
 282         if (!session->session_info->guest) {
 283                 session->compat_vuser->homes_snum =
 284                         register_homes_share(session->session_info->unix_name);
 285         }
 286
 287         if (!session_claim(session->sconn, session->compat_vuser)) {
 288                 DEBUG(1, ("smb2: Failed to claim session "
 289                         "for vuid=%d\n",
 290                         session->compat_vuser->vuid));
 291                 goto fail;
 292         }
 293
 294         session->status = NT_STATUS_OK;
 295
 296         /*
 297          * we attach the session to the request
 298          * so that the response can be signed
 299          */
 300         smb2req->session = session;
 301         if (session->do_signing) {
 302                 smb2req->do_signing = true;
 303         }
 304
 305         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 306         status = NT_STATUS_OK;
 307
 308         /* wrap that up in a nice GSS-API wrapping */
 309         ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
 310                                 TOK_ID_KRB_AP_REP);
 311
 312         secblob_out = spnego_gen_auth_response(
 313                                         talloc_tos(),
 314                                         &ap_rep_wrapped,
 315                                         status,
 316                                         mechOID);
 317
 318         *out_security_buffer = data_blob_talloc(smb2req,
 319                                                 secblob_out.data,
 320                                                 secblob_out.length);
 321         if (secblob_out.data && out_security_buffer->data == NULL) {
 322                 status = NT_STATUS_NO_MEMORY;
 323                 goto fail;
 324         }
 325
 326         data_blob_free(&ap_rep);
 327         data_blob_free(&ap_rep_wrapped);
 328         data_blob_free(&ticket);
 329         data_blob_free(&session_key);
 330         data_blob_free(&secblob_out);
 331
 332         *out_session_id = session->vuid;
 333
 334         return NT_STATUS_OK;
 335
 336   fail:
 337
 338         data_blob_free(&ap_rep);
 339         data_blob_free(&ap_rep_wrapped);
 340         data_blob_free(&ticket);
 341         data_blob_free(&session_key);
 342         data_blob_free(&secblob_out);
 343
 344         ap_rep_wrapped = data_blob_null;
 345         secblob_out = spnego_gen_auth_response(
 346                                         talloc_tos(),
 347                                         &ap_rep_wrapped,
 348                                         status,
 349                                         mechOID);
 350
 351         *out_security_buffer = data_blob_talloc(smb2req,
 352                                                 secblob_out.data,
 353                                                 secblob_out.length);
 354         data_blob_free(&secblob_out);
 355         return status;
 356 }
 357 #endif
 358
 359 static NTSTATUS smbd_smb2_spnego_negotiate(struct smbd_smb2_session *session,
 360                                         struct smbd_smb2_request *smb2req,
 361                                         uint8_t in_security_mode,
 362                                         DATA_BLOB in_security_buffer,
 363                                         uint16_t *out_session_flags,
 364                                         DATA_BLOB *out_security_buffer,
 365                                         uint64_t *out_session_id)
 366 {
 367         DATA_BLOB secblob_in = data_blob_null;
 368         DATA_BLOB chal_out = data_blob_null;
 369         char *kerb_mech = NULL;
 370         NTSTATUS status;
 371
 372         /* Ensure we have no old NTLM state around. */
 373         TALLOC_FREE(session->auth_ntlmssp_state);
 374
 375         status = parse_spnego_mechanisms(talloc_tos(), in_security_buffer,
 376                         &secblob_in, &kerb_mech);
 377         if (!NT_STATUS_IS_OK(status)) {
 378                 goto out;
 379         }
 380
 381 #ifdef HAVE_KRB5
 382         if (kerb_mech && ((lp_security()==SEC_ADS) ||
 383                                 USE_KERBEROS_KEYTAB) ) {
 384                 status = smbd_smb2_session_setup_krb5(session,
 385                                 smb2req,
 386                                 in_security_mode,
 387                                 &secblob_in,
 388                                 kerb_mech,
 389                                 out_session_flags,
 390                                 out_security_buffer,
 391                                 out_session_id);
 392
 393                 goto out;
 394         }
 395 #endif
 396
 397         if (kerb_mech) {
 398                 /* The mechtoken is a krb5 ticket, but
 399                  * we need to fall back to NTLM. */
 400
 401                 DEBUG(3,("smb2: Got krb5 ticket in SPNEGO "
 402                         "but set to downgrade to NTLMSSP\n"));
 403
 404                 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 405         } else {
 406                 /* Fall back to NTLMSSP. */
 407                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 408                 if (!NT_STATUS_IS_OK(status)) {
 409                         goto out;
 410                 }
 411
 412                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 413                                              secblob_in,
 414                                              &chal_out);
 415         }
 416
 417         if (!NT_STATUS_IS_OK(status) &&
 418                         !NT_STATUS_EQUAL(status,
 419                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 420                 goto out;
 421         }
 422
 423         *out_security_buffer = spnego_gen_auth_response(smb2req,
 424                                                 &chal_out,
 425                                                 status,
 426                                                 OID_NTLMSSP);
 427         if (out_security_buffer->data == NULL) {
 428                 status = NT_STATUS_NO_MEMORY;
 429                 goto out;
 430         }
 431         *out_session_id = session->vuid;
 432
 433   out:
 434
 435         data_blob_free(&secblob_in);
 436         data_blob_free(&chal_out);
 437         TALLOC_FREE(kerb_mech);
 438         if (!NT_STATUS_IS_OK(status) &&
 439                         !NT_STATUS_EQUAL(status,
 440                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 441                 TALLOC_FREE(session->auth_ntlmssp_state);
 442                 TALLOC_FREE(session);
 443         }
 444         return status;
 445 }
 446
 447 static NTSTATUS smbd_smb2_common_ntlmssp_auth_return(struct smbd_smb2_session *session,
 448                                         struct smbd_smb2_request *smb2req,
 449                                         uint8_t in_security_mode,
 450                                         DATA_BLOB in_security_buffer,
 451                                         uint16_t *out_session_flags,
 452                                         uint64_t *out_session_id)
 453 {
 454         fstring tmp;
 455
 456         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 457             lp_server_signing() == Required) {
 458                 session->do_signing = true;
 459         }
 460
 461         if (session->session_info->guest) {
 462                 /* we map anonymous to guest internally */
 463                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 464                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 465                 /* force no signing */
 466                 session->do_signing = false;
 467         }
 468
 469         session->session_key = session->session_info->session_key;
 470
 471         session->compat_vuser = talloc_zero(session, user_struct);
 472         if (session->compat_vuser == NULL) {
 473                 TALLOC_FREE(session->auth_ntlmssp_state);
 474                 TALLOC_FREE(session);
 475                 return NT_STATUS_NO_MEMORY;
 476         }
 477         session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
 478         session->compat_vuser->homes_snum = -1;
 479         session->compat_vuser->session_info = session->session_info;
 480         session->compat_vuser->session_keystr = NULL;
 481         session->compat_vuser->vuid = session->vuid;
 482         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 483
 484         /* This is a potentially untrusted username */
 485         alpha_strcpy(tmp,
 486                      auth_ntlmssp_get_username(session->auth_ntlmssp_state),
 487                      ". _-$",
 488                      sizeof(tmp));
 489         session->session_info->sanitized_username = talloc_strdup(
 490                 session->session_info, tmp);
 491
 492         if (!session->compat_vuser->session_info->guest) {
 493                 session->compat_vuser->homes_snum =
 494                         register_homes_share(session->session_info->unix_name);
 495         }
 496
 497         if (!session_claim(session->sconn, session->compat_vuser)) {
 498                 DEBUG(1, ("smb2: Failed to claim session "
 499                         "for vuid=%d\n",
 500                         session->compat_vuser->vuid));
 501                 TALLOC_FREE(session->auth_ntlmssp_state);
 502                 TALLOC_FREE(session);
 503                 return NT_STATUS_LOGON_FAILURE;
 504         }
 505
 506
 507         session->status = NT_STATUS_OK;
 508
 509         /*
 510          * we attach the session to the request
 511          * so that the response can be signed
 512          */
 513         smb2req->session = session;
 514         if (session->do_signing) {
 515                 smb2req->do_signing = true;
 516         }
 517
 518         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 519
 520         *out_session_id = session->vuid;
 521
 522         return NT_STATUS_OK;
 523 }
 524
 525 static NTSTATUS smbd_smb2_spnego_auth(struct smbd_smb2_session *session,
 526                                         struct smbd_smb2_request *smb2req,
 527                                         uint8_t in_security_mode,
 528                                         DATA_BLOB in_security_buffer,
 529                                         uint16_t *out_session_flags,
 530                                         DATA_BLOB *out_security_buffer,
 531                                         uint64_t *out_session_id)
 532 {
 533         DATA_BLOB auth = data_blob_null;
 534         DATA_BLOB auth_out = data_blob_null;
 535         NTSTATUS status;
 536
 537         if (!spnego_parse_auth(talloc_tos(), in_security_buffer, &auth)) {
 538                 TALLOC_FREE(session);
 539                 return NT_STATUS_LOGON_FAILURE;
 540         }
 541
 542         if (auth.data[0] == ASN1_APPLICATION(0)) {
 543                 /* Might be a second negTokenTarg packet */
 544                 DATA_BLOB secblob_in = data_blob_null;
 545                 char *kerb_mech = NULL;
 546
 547                 status = parse_spnego_mechanisms(talloc_tos(),
 548                                 in_security_buffer,
 549                                 &secblob_in, &kerb_mech);
 550                 if (!NT_STATUS_IS_OK(status)) {
 551                         TALLOC_FREE(session);
 552                         return status;
 553                 }
 554
 555 #ifdef HAVE_KRB5
 556                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 557                                         USE_KERBEROS_KEYTAB) ) {
 558                         status = smbd_smb2_session_setup_krb5(session,
 559                                         smb2req,
 560                                         in_security_mode,
 561                                         &secblob_in,
 562                                         kerb_mech,
 563                                         out_session_flags,
 564                                         out_security_buffer,
 565                                         out_session_id);
 566
 567                         data_blob_free(&secblob_in);
 568                         TALLOC_FREE(kerb_mech);
 569                         if (!NT_STATUS_IS_OK(status)) {
 570                                 TALLOC_FREE(session);
 571                         }
 572                         return status;
 573                 }
 574 #endif
 575
 576                 /* Can't blunder into NTLMSSP auth if we have
 577                  * a krb5 ticket. */
 578
 579                 if (kerb_mech) {
 580                         DEBUG(3,("smb2: network "
 581                                 "misconfiguration, client sent us a "
 582                                 "krb5 ticket and kerberos security "
 583                                 "not enabled\n"));
 584                         TALLOC_FREE(session);
 585                         data_blob_free(&secblob_in);
 586                         TALLOC_FREE(kerb_mech);
 587                         return NT_STATUS_LOGON_FAILURE;
 588                 }
 589
 590                 data_blob_free(&secblob_in);
 591         }
 592
 593         if (session->auth_ntlmssp_state == NULL) {
 594                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 595                 if (!NT_STATUS_IS_OK(status)) {
 596                         data_blob_free(&auth);
 597                         TALLOC_FREE(session);
 598                         return status;
 599                 }
 600         }
 601
 602         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 603                                      auth,
 604                                      &auth_out);
 605         /* We need to call setup_ntlmssp_session_info() if status==NT_STATUS_OK,
 606            or if status is anything except NT_STATUS_MORE_PROCESSING_REQUIRED,
 607            as this can trigger map to guest. */
 608         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 609                 status = setup_ntlmssp_session_info(session, status);
 610         }
 611
 612         if (!NT_STATUS_IS_OK(status) &&
 613                         !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 614                 TALLOC_FREE(session->auth_ntlmssp_state);
 615                 data_blob_free(&auth);
 616                 TALLOC_FREE(session);
 617                 return status;
 618         }
 619
 620         data_blob_free(&auth);
 621
 622         *out_security_buffer = spnego_gen_auth_response(smb2req,
 623                                 &auth_out, status, NULL);
 624
 625         if (out_security_buffer->data == NULL) {
 626                 TALLOC_FREE(session->auth_ntlmssp_state);
 627                 TALLOC_FREE(session);
 628                 return NT_STATUS_NO_MEMORY;
 629         }
 630
 631         *out_session_id = session->vuid;
 632
 633         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 634                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 635         }
 636
 637         /* We're done - claim the session. */
 638         return smbd_smb2_common_ntlmssp_auth_return(session,
 639                                                 smb2req,
 640                                                 in_security_mode,
 641                                                 in_security_buffer,
 642                                                 out_session_flags,
 643                                                 out_session_id);
 644 }
 645
 646 static NTSTATUS smbd_smb2_raw_ntlmssp_auth(struct smbd_smb2_session *session,
 647                                         struct smbd_smb2_request *smb2req,
 648                                         uint8_t in_security_mode,
 649                                         DATA_BLOB in_security_buffer,
 650                                         uint16_t *out_session_flags,
 651                                         DATA_BLOB *out_security_buffer,
 652                                         uint64_t *out_session_id)
 653 {
 654         NTSTATUS status;
 655         DATA_BLOB secblob_out = data_blob_null;
 656
 657         if (session->auth_ntlmssp_state == NULL) {
 658                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 659                 if (!NT_STATUS_IS_OK(status)) {
 660                         TALLOC_FREE(session);
 661                         return status;
 662                 }
 663         }
 664
 665         /* RAW NTLMSSP */
 666         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 667                                      in_security_buffer,
 668                                      &secblob_out);
 669
 670         if (NT_STATUS_IS_OK(status) ||
 671                         NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 672                 *out_security_buffer = data_blob_talloc(smb2req,
 673                                                 secblob_out.data,
 674                                                 secblob_out.length);
 675                 if (secblob_out.data && out_security_buffer->data == NULL) {
 676                         TALLOC_FREE(session->auth_ntlmssp_state);
 677                         TALLOC_FREE(session);
 678                         return NT_STATUS_NO_MEMORY;
 679                 }
 680         }
 681
 682         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 683                 *out_session_id = session->vuid;
 684                 return status;
 685         }
 686
 687         status = setup_ntlmssp_session_info(session, status);
 688
 689         if (!NT_STATUS_IS_OK(status)) {
 690                 TALLOC_FREE(session->auth_ntlmssp_state);
 691                 TALLOC_FREE(session);
 692                 return status;
 693         }
 694         *out_session_id = session->vuid;
 695
 696         return smbd_smb2_common_ntlmssp_auth_return(session,
 697                                                 smb2req,
 698                                                 in_security_mode,
 699                                                 in_security_buffer,
 700                                                 out_session_flags,
 701                                                 out_session_id);
 702 }
 703
 704 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
 705                                         uint64_t in_session_id,
 706                                         uint8_t in_security_mode,
 707                                         DATA_BLOB in_security_buffer,
 708                                         uint16_t *out_session_flags,
 709                                         DATA_BLOB *out_security_buffer,
 710                                         uint64_t *out_session_id)
 711 {
 712         struct smbd_smb2_session *session;
 713
 714         *out_session_flags = 0;
 715         *out_session_id = 0;
 716
 717         if (in_session_id == 0) {
 718                 int id;
 719
 720                 /* create a new session */
 721                 session = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
 722                 if (session == NULL) {
 723                         return NT_STATUS_NO_MEMORY;
 724                 }
 725                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 726                 id = idr_get_new_random(smb2req->sconn->smb2.sessions.idtree,
 727                                         session,
 728                                         smb2req->sconn->smb2.sessions.limit);
 729                 if (id == -1) {
 730                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 731                 }
 732                 session->vuid = id;
 733
 734                 session->tcons.idtree = idr_init(session);
 735                 if (session->tcons.idtree == NULL) {
 736                         return NT_STATUS_NO_MEMORY;
 737                 }
 738                 session->tcons.limit = 0x0000FFFE;
 739                 session->tcons.list = NULL;
 740
 741                 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, session,
 742                               struct smbd_smb2_session *);
 743                 session->sconn = smb2req->sconn;
 744                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 745         } else {
 746                 void *p;
 747
 748                 /* lookup an existing session */
 749                 p = idr_find(smb2req->sconn->smb2.sessions.idtree, in_session_id);
 750                 if (p == NULL) {
 751                         return NT_STATUS_USER_SESSION_DELETED;
 752                 }
 753                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 754         }
 755
 756         if (NT_STATUS_IS_OK(session->status)) {
 757                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 758         }
 759
 760         if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
 761                 return smbd_smb2_spnego_negotiate(session,
 762                                                 smb2req,
 763                                                 in_security_mode,
 764                                                 in_security_buffer,
 765                                                 out_session_flags,
 766                                                 out_security_buffer,
 767                                                 out_session_id);
 768         } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
 769                 return smbd_smb2_spnego_auth(session,
 770                                                 smb2req,
 771                                                 in_security_mode,
 772                                                 in_security_buffer,
 773                                                 out_session_flags,
 774                                                 out_security_buffer,
 775                                                 out_session_id);
 776         } else if (strncmp((char *)(in_security_buffer.data), "NTLMSSP", 7) == 0) {
 777                 return smbd_smb2_raw_ntlmssp_auth(session,
 778                                                 smb2req,
 779                                                 in_security_mode,
 780                                                 in_security_buffer,
 781                                                 out_session_flags,
 782                                                 out_security_buffer,
 783                                                 out_session_id);
 784         }
 785
 786         /* Unknown packet type. */
 787         DEBUG(1,("Unknown packet type %u in smb2 sessionsetup\n",
 788                 (unsigned int)in_security_buffer.data[0] ));
 789         TALLOC_FREE(session->auth_ntlmssp_state);
 790         TALLOC_FREE(session);
 791         return NT_STATUS_LOGON_FAILURE;
 792 }
 793
 794 NTSTATUS smbd_smb2_request_check_session(struct smbd_smb2_request *req)
 795 {
 796         const uint8_t *inhdr;
 797         const uint8_t *outhdr;
 798         int i = req->current_idx;
 799         uint64_t in_session_id;
 800         void *p;
 801         struct smbd_smb2_session *session;
 802         bool chained_fixup = false;
 803
 804         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 805
 806         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
 807
 808         if (in_session_id == (0xFFFFFFFFFFFFFFFFLL)) {
 809                 if (req->async) {
 810                         /*
 811                          * async request - fill in session_id from
 812                          * already setup request out.vector[].iov_base.
 813                          */
 814                         outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 815                         in_session_id = BVAL(outhdr, SMB2_HDR_SESSION_ID);
 816                 } else if (i > 2) {
 817                         /*
 818                          * Chained request - fill in session_id from
 819                          * the previous request out.vector[].iov_base.
 820                          */
 821                         outhdr = (const uint8_t *)req->out.vector[i-3].iov_base;
 822                         in_session_id = BVAL(outhdr, SMB2_HDR_SESSION_ID);
 823                         chained_fixup = true;
 824                 }
 825         }
 826
 827         /* lookup an existing session */
 828         p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
 829         if (p == NULL) {
 830                 return NT_STATUS_USER_SESSION_DELETED;
 831         }
 832         session = talloc_get_type_abort(p, struct smbd_smb2_session);
 833
 834         if (!NT_STATUS_IS_OK(session->status)) {
 835                 return NT_STATUS_ACCESS_DENIED;
 836         }
 837
 838         set_current_user_info(session->session_info->sanitized_username,
 839                               session->session_info->unix_name,
 840                               session->session_info->info3->base.domain.string);
 841
 842         req->session = session;
 843
 844         if (chained_fixup) {
 845                 /* Fix up our own outhdr. */
 846                 outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 847                 SBVAL(discard_const_p(uint8_t, outhdr), SMB2_HDR_SESSION_ID, in_session_id);
 848         }
 849         return NT_STATUS_OK;
 850 }
 851
 852 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 853 {
 854         const uint8_t *inbody;
 855         int i = req->current_idx;
 856         DATA_BLOB outbody;
 857         size_t expected_body_size = 0x04;
 858         size_t body_size;
 859
 860         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 861                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 862         }
 863
 864         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 865
 866         body_size = SVAL(inbody, 0x00);
 867         if (body_size != expected_body_size) {
 868                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 869         }
 870
 871         /*
 872          * TODO: cancel all outstanding requests on the session
 873          *       and delete all tree connections.
 874          */
 875         smbd_smb2_session_destructor(req->session);
 876         /*
 877          * we may need to sign the response, so we need to keep
 878          * the session until the response is sent to the wire.
 879          */
 880         talloc_steal(req, req->session);
 881
 882         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 883         if (outbody.data == NULL) {
 884                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 885         }
 886
 887         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 888         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 889
 890         return smbd_smb2_request_done(req, outbody, NULL);
 891 }