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->sconn->remote_address,
 408                                             &session->auth_ntlmssp_state);
 409                 if (!NT_STATUS_IS_OK(status)) {
 410                         goto out;
 411                 }
 412
 413                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 414                                              secblob_in,
 415                                              &chal_out);
 416         }
 417
 418         if (!NT_STATUS_IS_OK(status) &&
 419                         !NT_STATUS_EQUAL(status,
 420                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 421                 goto out;
 422         }
 423
 424         *out_security_buffer = spnego_gen_auth_response(smb2req,
 425                                                 &chal_out,
 426                                                 status,
 427                                                 OID_NTLMSSP);
 428         if (out_security_buffer->data == NULL) {
 429                 status = NT_STATUS_NO_MEMORY;
 430                 goto out;
 431         }
 432         *out_session_id = session->vuid;
 433
 434   out:
 435
 436         data_blob_free(&secblob_in);
 437         data_blob_free(&chal_out);
 438         TALLOC_FREE(kerb_mech);
 439         if (!NT_STATUS_IS_OK(status) &&
 440                         !NT_STATUS_EQUAL(status,
 441                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 442                 TALLOC_FREE(session->auth_ntlmssp_state);
 443                 TALLOC_FREE(session);
 444         }
 445         return status;
 446 }
 447
 448 static NTSTATUS smbd_smb2_common_ntlmssp_auth_return(struct smbd_smb2_session *session,
 449                                         struct smbd_smb2_request *smb2req,
 450                                         uint8_t in_security_mode,
 451                                         DATA_BLOB in_security_buffer,
 452                                         uint16_t *out_session_flags,
 453                                         uint64_t *out_session_id)
 454 {
 455         fstring tmp;
 456
 457         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 458             lp_server_signing() == Required) {
 459                 session->do_signing = true;
 460         }
 461
 462         if (session->session_info->guest) {
 463                 /* we map anonymous to guest internally */
 464                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 465                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 466                 /* force no signing */
 467                 session->do_signing = false;
 468         }
 469
 470         session->session_key = session->session_info->session_key;
 471
 472         session->compat_vuser = talloc_zero(session, user_struct);
 473         if (session->compat_vuser == NULL) {
 474                 TALLOC_FREE(session->auth_ntlmssp_state);
 475                 TALLOC_FREE(session);
 476                 return NT_STATUS_NO_MEMORY;
 477         }
 478         session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
 479         session->compat_vuser->homes_snum = -1;
 480         session->compat_vuser->session_info = session->session_info;
 481         session->compat_vuser->session_keystr = NULL;
 482         session->compat_vuser->vuid = session->vuid;
 483         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 484
 485         /* This is a potentially untrusted username */
 486         alpha_strcpy(tmp,
 487                      auth_ntlmssp_get_username(session->auth_ntlmssp_state),
 488                      ". _-$",
 489                      sizeof(tmp));
 490         session->session_info->sanitized_username = talloc_strdup(
 491                 session->session_info, tmp);
 492
 493         if (!session->compat_vuser->session_info->guest) {
 494                 session->compat_vuser->homes_snum =
 495                         register_homes_share(session->session_info->unix_name);
 496         }
 497
 498         if (!session_claim(session->sconn, session->compat_vuser)) {
 499                 DEBUG(1, ("smb2: Failed to claim session "
 500                         "for vuid=%d\n",
 501                         session->compat_vuser->vuid));
 502                 TALLOC_FREE(session->auth_ntlmssp_state);
 503                 TALLOC_FREE(session);
 504                 return NT_STATUS_LOGON_FAILURE;
 505         }
 506
 507
 508         session->status = NT_STATUS_OK;
 509
 510         /*
 511          * we attach the session to the request
 512          * so that the response can be signed
 513          */
 514         smb2req->session = session;
 515         if (session->do_signing) {
 516                 smb2req->do_signing = true;
 517         }
 518
 519         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 520
 521         *out_session_id = session->vuid;
 522
 523         return NT_STATUS_OK;
 524 }
 525
 526 static NTSTATUS smbd_smb2_spnego_auth(struct smbd_smb2_session *session,
 527                                         struct smbd_smb2_request *smb2req,
 528                                         uint8_t in_security_mode,
 529                                         DATA_BLOB in_security_buffer,
 530                                         uint16_t *out_session_flags,
 531                                         DATA_BLOB *out_security_buffer,
 532                                         uint64_t *out_session_id)
 533 {
 534         DATA_BLOB auth = data_blob_null;
 535         DATA_BLOB auth_out = data_blob_null;
 536         NTSTATUS status;
 537
 538         if (!spnego_parse_auth(talloc_tos(), in_security_buffer, &auth)) {
 539                 TALLOC_FREE(session);
 540                 return NT_STATUS_LOGON_FAILURE;
 541         }
 542
 543         if (auth.data[0] == ASN1_APPLICATION(0)) {
 544                 /* Might be a second negTokenTarg packet */
 545                 DATA_BLOB secblob_in = data_blob_null;
 546                 char *kerb_mech = NULL;
 547
 548                 status = parse_spnego_mechanisms(talloc_tos(),
 549                                 in_security_buffer,
 550                                 &secblob_in, &kerb_mech);
 551                 if (!NT_STATUS_IS_OK(status)) {
 552                         TALLOC_FREE(session);
 553                         return status;
 554                 }
 555
 556 #ifdef HAVE_KRB5
 557                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 558                                         USE_KERBEROS_KEYTAB) ) {
 559                         status = smbd_smb2_session_setup_krb5(session,
 560                                         smb2req,
 561                                         in_security_mode,
 562                                         &secblob_in,
 563                                         kerb_mech,
 564                                         out_session_flags,
 565                                         out_security_buffer,
 566                                         out_session_id);
 567
 568                         data_blob_free(&secblob_in);
 569                         TALLOC_FREE(kerb_mech);
 570                         if (!NT_STATUS_IS_OK(status)) {
 571                                 TALLOC_FREE(session);
 572                         }
 573                         return status;
 574                 }
 575 #endif
 576
 577                 /* Can't blunder into NTLMSSP auth if we have
 578                  * a krb5 ticket. */
 579
 580                 if (kerb_mech) {
 581                         DEBUG(3,("smb2: network "
 582                                 "misconfiguration, client sent us a "
 583                                 "krb5 ticket and kerberos security "
 584                                 "not enabled\n"));
 585                         TALLOC_FREE(session);
 586                         data_blob_free(&secblob_in);
 587                         TALLOC_FREE(kerb_mech);
 588                         return NT_STATUS_LOGON_FAILURE;
 589                 }
 590
 591                 data_blob_free(&secblob_in);
 592         }
 593
 594         if (session->auth_ntlmssp_state == NULL) {
 595                 status = auth_ntlmssp_start(session->sconn->remote_address,
 596                                             &session->auth_ntlmssp_state);
 597                 if (!NT_STATUS_IS_OK(status)) {
 598                         data_blob_free(&auth);
 599                         TALLOC_FREE(session);
 600                         return status;
 601                 }
 602         }
 603
 604         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 605                                      auth,
 606                                      &auth_out);
 607         /* We need to call setup_ntlmssp_session_info() if status==NT_STATUS_OK,
 608            or if status is anything except NT_STATUS_MORE_PROCESSING_REQUIRED,
 609            as this can trigger map to guest. */
 610         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 611                 status = setup_ntlmssp_session_info(session, status);
 612         }
 613
 614         if (!NT_STATUS_IS_OK(status) &&
 615                         !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 616                 TALLOC_FREE(session->auth_ntlmssp_state);
 617                 data_blob_free(&auth);
 618                 TALLOC_FREE(session);
 619                 return status;
 620         }
 621
 622         data_blob_free(&auth);
 623
 624         *out_security_buffer = spnego_gen_auth_response(smb2req,
 625                                 &auth_out, status, NULL);
 626
 627         if (out_security_buffer->data == NULL) {
 628                 TALLOC_FREE(session->auth_ntlmssp_state);
 629                 TALLOC_FREE(session);
 630                 return NT_STATUS_NO_MEMORY;
 631         }
 632
 633         *out_session_id = session->vuid;
 634
 635         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 636                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 637         }
 638
 639         /* We're done - claim the session. */
 640         return smbd_smb2_common_ntlmssp_auth_return(session,
 641                                                 smb2req,
 642                                                 in_security_mode,
 643                                                 in_security_buffer,
 644                                                 out_session_flags,
 645                                                 out_session_id);
 646 }
 647
 648 static NTSTATUS smbd_smb2_raw_ntlmssp_auth(struct smbd_smb2_session *session,
 649                                         struct smbd_smb2_request *smb2req,
 650                                         uint8_t in_security_mode,
 651                                         DATA_BLOB in_security_buffer,
 652                                         uint16_t *out_session_flags,
 653                                         DATA_BLOB *out_security_buffer,
 654                                         uint64_t *out_session_id)
 655 {
 656         NTSTATUS status;
 657         DATA_BLOB secblob_out = data_blob_null;
 658
 659         if (session->auth_ntlmssp_state == NULL) {
 660                 status = auth_ntlmssp_start(session->sconn->remote_address,
 661                                             &session->auth_ntlmssp_state);
 662                 if (!NT_STATUS_IS_OK(status)) {
 663                         TALLOC_FREE(session);
 664                         return status;
 665                 }
 666         }
 667
 668         /* RAW NTLMSSP */
 669         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 670                                      in_security_buffer,
 671                                      &secblob_out);
 672
 673         if (NT_STATUS_IS_OK(status) ||
 674                         NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 675                 *out_security_buffer = data_blob_talloc(smb2req,
 676                                                 secblob_out.data,
 677                                                 secblob_out.length);
 678                 if (secblob_out.data && out_security_buffer->data == NULL) {
 679                         TALLOC_FREE(session->auth_ntlmssp_state);
 680                         TALLOC_FREE(session);
 681                         return NT_STATUS_NO_MEMORY;
 682                 }
 683         }
 684
 685         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 686                 *out_session_id = session->vuid;
 687                 return status;
 688         }
 689
 690         status = setup_ntlmssp_session_info(session, status);
 691
 692         if (!NT_STATUS_IS_OK(status)) {
 693                 TALLOC_FREE(session->auth_ntlmssp_state);
 694                 TALLOC_FREE(session);
 695                 return status;
 696         }
 697         *out_session_id = session->vuid;
 698
 699         return smbd_smb2_common_ntlmssp_auth_return(session,
 700                                                 smb2req,
 701                                                 in_security_mode,
 702                                                 in_security_buffer,
 703                                                 out_session_flags,
 704                                                 out_session_id);
 705 }
 706
 707 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
 708                                         uint64_t in_session_id,
 709                                         uint8_t in_security_mode,
 710                                         DATA_BLOB in_security_buffer,
 711                                         uint16_t *out_session_flags,
 712                                         DATA_BLOB *out_security_buffer,
 713                                         uint64_t *out_session_id)
 714 {
 715         struct smbd_smb2_session *session;
 716
 717         *out_session_flags = 0;
 718         *out_session_id = 0;
 719
 720         if (in_session_id == 0) {
 721                 int id;
 722
 723                 /* create a new session */
 724                 session = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
 725                 if (session == NULL) {
 726                         return NT_STATUS_NO_MEMORY;
 727                 }
 728                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 729                 id = idr_get_new_random(smb2req->sconn->smb2.sessions.idtree,
 730                                         session,
 731                                         smb2req->sconn->smb2.sessions.limit);
 732                 if (id == -1) {
 733                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 734                 }
 735                 session->vuid = id;
 736
 737                 session->tcons.idtree = idr_init(session);
 738                 if (session->tcons.idtree == NULL) {
 739                         return NT_STATUS_NO_MEMORY;
 740                 }
 741                 session->tcons.limit = 0x0000FFFE;
 742                 session->tcons.list = NULL;
 743
 744                 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, session,
 745                               struct smbd_smb2_session *);
 746                 session->sconn = smb2req->sconn;
 747                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 748         } else {
 749                 void *p;
 750
 751                 /* lookup an existing session */
 752                 p = idr_find(smb2req->sconn->smb2.sessions.idtree, in_session_id);
 753                 if (p == NULL) {
 754                         return NT_STATUS_USER_SESSION_DELETED;
 755                 }
 756                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 757         }
 758
 759         if (NT_STATUS_IS_OK(session->status)) {
 760                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 761         }
 762
 763         if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
 764                 return smbd_smb2_spnego_negotiate(session,
 765                                                 smb2req,
 766                                                 in_security_mode,
 767                                                 in_security_buffer,
 768                                                 out_session_flags,
 769                                                 out_security_buffer,
 770                                                 out_session_id);
 771         } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
 772                 return smbd_smb2_spnego_auth(session,
 773                                                 smb2req,
 774                                                 in_security_mode,
 775                                                 in_security_buffer,
 776                                                 out_session_flags,
 777                                                 out_security_buffer,
 778                                                 out_session_id);
 779         } else if (strncmp((char *)(in_security_buffer.data), "NTLMSSP", 7) == 0) {
 780                 return smbd_smb2_raw_ntlmssp_auth(session,
 781                                                 smb2req,
 782                                                 in_security_mode,
 783                                                 in_security_buffer,
 784                                                 out_session_flags,
 785                                                 out_security_buffer,
 786                                                 out_session_id);
 787         }
 788
 789         /* Unknown packet type. */
 790         DEBUG(1,("Unknown packet type %u in smb2 sessionsetup\n",
 791                 (unsigned int)in_security_buffer.data[0] ));
 792         TALLOC_FREE(session->auth_ntlmssp_state);
 793         TALLOC_FREE(session);
 794         return NT_STATUS_LOGON_FAILURE;
 795 }
 796
 797 NTSTATUS smbd_smb2_request_check_session(struct smbd_smb2_request *req)
 798 {
 799         const uint8_t *inhdr;
 800         const uint8_t *outhdr;
 801         int i = req->current_idx;
 802         uint64_t in_session_id;
 803         void *p;
 804         struct smbd_smb2_session *session;
 805         bool chained_fixup = false;
 806
 807         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 808
 809         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
 810
 811         if (in_session_id == (0xFFFFFFFFFFFFFFFFLL)) {
 812                 if (req->async) {
 813                         /*
 814                          * async request - fill in session_id from
 815                          * already setup request out.vector[].iov_base.
 816                          */
 817                         outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 818                         in_session_id = BVAL(outhdr, SMB2_HDR_SESSION_ID);
 819                 } else if (i > 2) {
 820                         /*
 821                          * Chained request - fill in session_id from
 822                          * the previous request out.vector[].iov_base.
 823                          */
 824                         outhdr = (const uint8_t *)req->out.vector[i-3].iov_base;
 825                         in_session_id = BVAL(outhdr, SMB2_HDR_SESSION_ID);
 826                         chained_fixup = true;
 827                 }
 828         }
 829
 830         /* lookup an existing session */
 831         p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
 832         if (p == NULL) {
 833                 return NT_STATUS_USER_SESSION_DELETED;
 834         }
 835         session = talloc_get_type_abort(p, struct smbd_smb2_session);
 836
 837         if (!NT_STATUS_IS_OK(session->status)) {
 838                 return NT_STATUS_ACCESS_DENIED;
 839         }
 840
 841         set_current_user_info(session->session_info->sanitized_username,
 842                               session->session_info->unix_name,
 843                               session->session_info->info3->base.domain.string);
 844
 845         req->session = session;
 846
 847         if (chained_fixup) {
 848                 /* Fix up our own outhdr. */
 849                 outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 850                 SBVAL(discard_const_p(uint8_t, outhdr), SMB2_HDR_SESSION_ID, in_session_id);
 851         }
 852         return NT_STATUS_OK;
 853 }
 854
 855 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 856 {
 857         const uint8_t *inbody;
 858         int i = req->current_idx;
 859         DATA_BLOB outbody;
 860         size_t expected_body_size = 0x04;
 861         size_t body_size;
 862
 863         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 864                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 865         }
 866
 867         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 868
 869         body_size = SVAL(inbody, 0x00);
 870         if (body_size != expected_body_size) {
 871                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 872         }
 873
 874         /*
 875          * TODO: cancel all outstanding requests on the session
 876          *       and delete all tree connections.
 877          */
 878         smbd_smb2_session_destructor(req->session);
 879         /*
 880          * we may need to sign the response, so we need to keep
 881          * the session until the response is sent to the wire.
 882          */
 883         talloc_steal(req, req->session);
 884
 885         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 886         if (outbody.data == NULL) {
 887                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 888         }
 889
 890         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 891         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 892
 893         return smbd_smb2_request_done(req, outbody, NULL);
 894 }