source3/smbd/smb2_negprot.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25 #include "../libcli/smb/smb2_negotiate_context.h"
  26 #include "../lib/tsocket/tsocket.h"
  27 #include "../librpc/ndr/libndr.h"
  28 #include "../libcli/smb/smb_signing.h"
  29
  30 extern fstring remote_proto;
  31
  32 /*
  33  * this is the entry point if SMB2 is selected via
  34  * the SMB negprot and the given dialect.
  35  */
  36 static void reply_smb20xx(struct smb_request *req, uint16_t dialect)
  37 {
  38         uint8_t *smb2_inpdu;
  39         uint8_t *smb2_hdr;
  40         uint8_t *smb2_body;
  41         uint8_t *smb2_dyn;
  42         size_t len = SMB2_HDR_BODY + 0x24 + 2;
  43
  44         smb2_inpdu = talloc_zero_array(talloc_tos(), uint8_t, len);
  45         if (smb2_inpdu == NULL) {
  46                 DEBUG(0, ("Could not push spnego blob\n"));
  47                 reply_nterror(req, NT_STATUS_NO_MEMORY);
  48                 return;
  49         }
  50         smb2_hdr = smb2_inpdu;
  51         smb2_body = smb2_hdr + SMB2_HDR_BODY;
  52         smb2_dyn = smb2_body + 0x24;
  53
  54         SIVAL(smb2_hdr, SMB2_HDR_PROTOCOL_ID,   SMB2_MAGIC);
  55         SIVAL(smb2_hdr, SMB2_HDR_LENGTH,        SMB2_HDR_BODY);
  56
  57         SSVAL(smb2_body, 0x00, 0x0024); /* struct size */
  58         SSVAL(smb2_body, 0x02, 0x0001); /* dialect count */
  59
  60         SSVAL(smb2_dyn,  0x00, dialect);
  61
  62         req->outbuf = NULL;
  63
  64         smbd_smb2_process_negprot(req->xconn, 0, smb2_inpdu, len);
  65         return;
  66 }
  67
  68 /*
  69  * this is the entry point if SMB2 is selected via
  70  * the SMB negprot and the "SMB 2.002" dialect.
  71  */
  72 void reply_smb2002(struct smb_request *req, uint16_t choice)
  73 {
  74         reply_smb20xx(req, SMB2_DIALECT_REVISION_202);
  75 }
  76
  77 /*
  78  * this is the entry point if SMB2 is selected via
  79  * the SMB negprot and the "SMB 2.???" dialect.
  80  */
  81 void reply_smb20ff(struct smb_request *req, uint16_t choice)
  82 {
  83         struct smbXsrv_connection *xconn = req->xconn;
  84         xconn->smb2.allow_2ff = true;
  85         reply_smb20xx(req, SMB2_DIALECT_REVISION_2FF);
  86 }
  87
  88 enum protocol_types smbd_smb2_protocol_dialect_match(const uint8_t *indyn,
  89                                 const int dialect_count,
  90                                 uint16_t *dialect)
  91 {
  92         struct {
  93                 enum protocol_types proto;
  94                 uint16_t dialect;
  95         } pd[] = {
  96                 { PROTOCOL_SMB3_11, SMB3_DIALECT_REVISION_311 },
  97                 { PROTOCOL_SMB3_10, SMB3_DIALECT_REVISION_310 },
  98                 { PROTOCOL_SMB3_02, SMB3_DIALECT_REVISION_302 },
  99                 { PROTOCOL_SMB3_00, SMB3_DIALECT_REVISION_300 },
 100                 { PROTOCOL_SMB2_24, SMB2_DIALECT_REVISION_224 },
 101                 { PROTOCOL_SMB2_22, SMB2_DIALECT_REVISION_222 },
 102                 { PROTOCOL_SMB2_10, SMB2_DIALECT_REVISION_210 },
 103                 { PROTOCOL_SMB2_02, SMB2_DIALECT_REVISION_202 },
 104         };
 105         size_t i;
 106
 107         for (i = 0; i < ARRAY_SIZE(pd); i ++) {
 108                 size_t c = 0;
 109
 110                 if (lp_server_max_protocol() < pd[i].proto) {
 111                         continue;
 112                 }
 113                 if (lp_server_min_protocol() > pd[i].proto) {
 114                         continue;
 115                 }
 116
 117                 for (c = 0; c < dialect_count; c++) {
 118                         *dialect = SVAL(indyn, c*2);
 119                         if (*dialect == pd[i].dialect) {
 120                                 return pd[i].proto;
 121                         }
 122                 }
 123         }
 124
 125         return PROTOCOL_NONE;
 126 }
 127
 128 NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
 129 {
 130         struct smbXsrv_connection *xconn = req->xconn;
 131         NTSTATUS status;
 132         const uint8_t *inbody;
 133         const uint8_t *indyn = NULL;
 134         DATA_BLOB outbody;
 135         DATA_BLOB outdyn;
 136         DATA_BLOB negprot_spnego_blob;
 137         uint16_t security_offset;
 138         DATA_BLOB security_buffer;
 139         size_t expected_dyn_size = 0;
 140         size_t c;
 141         uint16_t security_mode;
 142         uint16_t dialect_count;
 143         uint16_t in_security_mode;
 144         uint32_t in_capabilities;
 145         DATA_BLOB in_guid_blob;
 146         struct GUID in_guid;
 147         struct smb2_negotiate_contexts in_c = { .num_contexts = 0, };
 148         struct smb2_negotiate_context *in_preauth = NULL;
 149         struct smb2_negotiate_context *in_cipher = NULL;
 150         struct smb2_negotiate_contexts out_c = { .num_contexts = 0, };
 151         DATA_BLOB out_negotiate_context_blob = data_blob_null;
 152         uint32_t out_negotiate_context_offset = 0;
 153         uint16_t out_negotiate_context_count = 0;
 154         uint16_t dialect = 0;
 155         uint32_t capabilities;
 156         DATA_BLOB out_guid_blob;
 157         struct GUID out_guid;
 158         enum protocol_types protocol = PROTOCOL_NONE;
 159         uint32_t max_limit;
 160         uint32_t max_trans = lp_smb2_max_trans();
 161         uint32_t max_read = lp_smb2_max_read();
 162         uint32_t max_write = lp_smb2_max_write();
 163         NTTIME now = timeval_to_nttime(&req->request_time);
 164         bool signing_required = true;
 165         bool ok;
 166
 167         status = smbd_smb2_request_verify_sizes(req, 0x24);
 168         if (!NT_STATUS_IS_OK(status)) {
 169                 return smbd_smb2_request_error(req, status);
 170         }
 171         inbody = SMBD_SMB2_IN_BODY_PTR(req);
 172
 173         dialect_count = SVAL(inbody, 0x02);
 174
 175         in_security_mode = SVAL(inbody, 0x04);
 176         in_capabilities = IVAL(inbody, 0x08);
 177         in_guid_blob = data_blob_const(inbody + 0x0C, 16);
 178
 179         if (dialect_count == 0) {
 180                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 181         }
 182
 183         status = GUID_from_ndr_blob(&in_guid_blob, &in_guid);
 184         if (!NT_STATUS_IS_OK(status)) {
 185                 return smbd_smb2_request_error(req, status);
 186         }
 187
 188         expected_dyn_size = dialect_count * 2;
 189         if (SMBD_SMB2_IN_DYN_LEN(req) < expected_dyn_size) {
 190                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 191         }
 192         indyn = SMBD_SMB2_IN_DYN_PTR(req);
 193
 194         protocol = smbd_smb2_protocol_dialect_match(indyn,
 195                                         dialect_count,
 196                                         &dialect);
 197
 198         for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) {
 199                 if (lp_server_max_protocol() < PROTOCOL_SMB2_10) {
 200                         break;
 201                 }
 202
 203                 dialect = SVAL(indyn, c*2);
 204                 if (dialect == SMB2_DIALECT_REVISION_2FF) {
 205                         if (xconn->smb2.allow_2ff) {
 206                                 xconn->smb2.allow_2ff = false;
 207                                 protocol = PROTOCOL_SMB2_10;
 208                                 break;
 209                         }
 210                 }
 211         }
 212
 213         if (protocol == PROTOCOL_NONE) {
 214                 return smbd_smb2_request_error(req, NT_STATUS_NOT_SUPPORTED);
 215         }
 216
 217         if (protocol >= PROTOCOL_SMB3_10) {
 218                 uint32_t in_negotiate_context_offset = 0;
 219                 uint16_t in_negotiate_context_count = 0;
 220                 DATA_BLOB in_negotiate_context_blob = data_blob_null;
 221                 size_t ofs;
 222
 223                 in_negotiate_context_offset = IVAL(inbody, 0x1C);
 224                 in_negotiate_context_count = SVAL(inbody, 0x20);
 225
 226                 ofs = SMB2_HDR_BODY;
 227                 ofs += SMBD_SMB2_IN_BODY_LEN(req);
 228                 ofs += expected_dyn_size;
 229                 if ((ofs % 8) != 0) {
 230                         ofs += 8 - (ofs % 8);
 231                 }
 232
 233                 if (in_negotiate_context_offset != ofs) {
 234                         return smbd_smb2_request_error(req,
 235                                         NT_STATUS_INVALID_PARAMETER);
 236                 }
 237
 238                 ofs -= SMB2_HDR_BODY;
 239                 ofs -= SMBD_SMB2_IN_BODY_LEN(req);
 240
 241                 if (SMBD_SMB2_IN_DYN_LEN(req) < ofs) {
 242                         return smbd_smb2_request_error(req,
 243                                         NT_STATUS_INVALID_PARAMETER);
 244                 }
 245
 246                 in_negotiate_context_blob = data_blob_const(indyn,
 247                                                 SMBD_SMB2_IN_DYN_LEN(req));
 248
 249                 in_negotiate_context_blob.data += ofs;
 250                 in_negotiate_context_blob.length -= ofs;
 251
 252                 status = smb2_negotiate_context_parse(req,
 253                                         in_negotiate_context_blob, &in_c);
 254                 if (!NT_STATUS_IS_OK(status)) {
 255                         return smbd_smb2_request_error(req, status);
 256                 }
 257
 258                 if (in_negotiate_context_count != in_c.num_contexts) {
 259                         return smbd_smb2_request_error(req,
 260                                         NT_STATUS_INVALID_PARAMETER);
 261                 }
 262         }
 263
 264         if ((dialect != SMB2_DIALECT_REVISION_2FF) &&
 265             (protocol >= PROTOCOL_SMB2_10) &&
 266             !GUID_all_zero(&in_guid))
 267         {
 268                 ok = remote_arch_cache_update(&in_guid);
 269                 if (!ok) {
 270                         return smbd_smb2_request_error(
 271                                 req, NT_STATUS_UNSUCCESSFUL);
 272                 }
 273         }
 274
 275         switch (get_remote_arch()) {
 276         case RA_VISTA:
 277         case RA_SAMBA:
 278         case RA_CIFSFS:
 279         case RA_OSX:
 280                 break;
 281         default:
 282                 set_remote_arch(RA_VISTA);
 283                 break;
 284         }
 285
 286         fstr_sprintf(remote_proto, "SMB%X_%02X",
 287                      (dialect >> 8) & 0xFF, dialect & 0xFF);
 288
 289         reload_services(req->sconn, conn_snum_used, true);
 290         DEBUG(3,("Selected protocol %s\n", remote_proto));
 291
 292         in_preauth = smb2_negotiate_context_find(&in_c,
 293                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES);
 294         if (protocol >= PROTOCOL_SMB3_10 && in_preauth == NULL) {
 295                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 296         }
 297         in_cipher = smb2_negotiate_context_find(&in_c,
 298                                         SMB2_ENCRYPTION_CAPABILITIES);
 299
 300         /* negprot_spnego() returns a the server guid in the first 16 bytes */
 301         negprot_spnego_blob = negprot_spnego(req, xconn);
 302         if (negprot_spnego_blob.data == NULL) {
 303                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 304         }
 305
 306         if (negprot_spnego_blob.length < 16) {
 307                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 308         }
 309
 310         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 311         /*
 312          * We use xconn->smb1.signing_state as that's already present
 313          * and used lpcfg_server_signing_allowed() to get the correct
 314          * defaults, e.g. signing_required for an ad_dc.
 315          */
 316         signing_required = smb_signing_is_mandatory(xconn->smb1.signing_state);
 317         if (signing_required) {
 318                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 319         }
 320
 321         capabilities = 0;
 322         if (lp_host_msdfs()) {
 323                 capabilities |= SMB2_CAP_DFS;
 324         }
 325
 326         if (protocol >= PROTOCOL_SMB2_10 &&
 327             lp_smb2_leases() &&
 328             lp_oplocks(GLOBAL_SECTION_SNUM) &&
 329             !lp_kernel_oplocks(GLOBAL_SECTION_SNUM))
 330         {
 331                 capabilities |= SMB2_CAP_LEASING;
 332         }
 333
 334         if ((protocol >= PROTOCOL_SMB2_24) &&
 335             (lp_smb_encrypt(-1) != SMB_SIGNING_OFF) &&
 336             (in_capabilities & SMB2_CAP_ENCRYPTION)) {
 337                 capabilities |= SMB2_CAP_ENCRYPTION;
 338         }
 339
 340         /*
 341          * 0x10000 (65536) is the maximum allowed message size
 342          * for SMB 2.0
 343          */
 344         max_limit = 0x10000;
 345
 346         if (protocol >= PROTOCOL_SMB2_10) {
 347                 int p = 0;
 348
 349                 if (tsocket_address_is_inet(req->sconn->local_address, "ip")) {
 350                         p = tsocket_address_inet_port(req->sconn->local_address);
 351                 }
 352
 353                 /* largeMTU is not supported over NBT (tcp port 139) */
 354                 if (p != NBT_SMB_PORT) {
 355                         capabilities |= SMB2_CAP_LARGE_MTU;
 356                         xconn->smb2.credits.multicredit = true;
 357
 358                         /*
 359                          * We allow up to almost 16MB.
 360                          *
 361                          * The maximum PDU size is 0xFFFFFF (16776960)
 362                          * and we need some space for the header.
 363                          */
 364                         max_limit = 0xFFFF00;
 365                 }
 366         }
 367
 368         /*
 369          * the defaults are 8MB, but we'll limit this to max_limit based on
 370          * the dialect (64kb for SMB 2.0, 8MB for SMB >= 2.1 with LargeMTU)
 371          *
 372          * user configured values exceeding the limits will be overwritten,
 373          * only smaller values will be accepted
 374          */
 375
 376         max_trans = MIN(max_limit, lp_smb2_max_trans());
 377         max_read = MIN(max_limit, lp_smb2_max_read());
 378         max_write = MIN(max_limit, lp_smb2_max_write());
 379
 380         if (in_preauth != NULL) {
 381                 size_t needed = 4;
 382                 uint16_t hash_count;
 383                 uint16_t salt_length;
 384                 uint16_t selected_preauth = 0;
 385                 const uint8_t *p;
 386                 uint8_t buf[38];
 387                 DATA_BLOB b;
 388                 size_t i;
 389
 390                 if (in_preauth->data.length < needed) {
 391                         return smbd_smb2_request_error(req,
 392                                         NT_STATUS_INVALID_PARAMETER);
 393                 }
 394
 395                 hash_count = SVAL(in_preauth->data.data, 0);
 396                 salt_length = SVAL(in_preauth->data.data, 2);
 397
 398                 if (hash_count == 0) {
 399                         return smbd_smb2_request_error(req,
 400                                         NT_STATUS_INVALID_PARAMETER);
 401                 }
 402
 403                 p = in_preauth->data.data + needed;
 404                 needed += hash_count * 2;
 405                 needed += salt_length;
 406
 407                 if (in_preauth->data.length < needed) {
 408                         return smbd_smb2_request_error(req,
 409                                         NT_STATUS_INVALID_PARAMETER);
 410                 }
 411
 412                 for (i=0; i < hash_count; i++) {
 413                         uint16_t v;
 414
 415                         v = SVAL(p, 0);
 416                         p += 2;
 417
 418                         if (v == SMB2_PREAUTH_INTEGRITY_SHA512) {
 419                                 selected_preauth = v;
 420                                 break;
 421                         }
 422                 }
 423
 424                 if (selected_preauth == 0) {
 425                         return smbd_smb2_request_error(req,
 426                                 NT_STATUS_SMB_NO_PREAUTH_INTEGRITY_HASH_OVERLAP);
 427                 }
 428
 429                 SSVAL(buf, 0,  1); /* HashAlgorithmCount */
 430                 SSVAL(buf, 2, 32); /* SaltLength */
 431                 SSVAL(buf, 4, selected_preauth);
 432                 generate_random_buffer(buf + 6, 32);
 433
 434                 b = data_blob_const(buf, sizeof(buf));
 435                 status = smb2_negotiate_context_add(req, &out_c,
 436                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES, b);
 437                 if (!NT_STATUS_IS_OK(status)) {
 438                         return smbd_smb2_request_error(req, status);
 439                 }
 440
 441                 req->preauth = &req->xconn->smb2.preauth;
 442         }
 443
 444         if ((capabilities & SMB2_CAP_ENCRYPTION) && (in_cipher != NULL)) {
 445                 size_t needed = 2;
 446                 uint16_t cipher_count;
 447                 const uint8_t *p;
 448                 uint8_t buf[4];
 449                 DATA_BLOB b;
 450                 size_t i;
 451                 bool aes_128_ccm_supported = false;
 452                 bool aes_128_gcm_supported = false;
 453
 454                 capabilities &= ~SMB2_CAP_ENCRYPTION;
 455
 456                 if (in_cipher->data.length < needed) {
 457                         return smbd_smb2_request_error(req,
 458                                         NT_STATUS_INVALID_PARAMETER);
 459                 }
 460
 461                 cipher_count = SVAL(in_cipher->data.data, 0);
 462
 463                 if (cipher_count == 0) {
 464                         return smbd_smb2_request_error(req,
 465                                         NT_STATUS_INVALID_PARAMETER);
 466                 }
 467
 468                 p = in_cipher->data.data + needed;
 469                 needed += cipher_count * 2;
 470
 471                 if (in_cipher->data.length < needed) {
 472                         return smbd_smb2_request_error(req,
 473                                         NT_STATUS_INVALID_PARAMETER);
 474                 }
 475
 476                 for (i=0; i < cipher_count; i++) {
 477                         uint16_t v;
 478
 479                         v = SVAL(p, 0);
 480                         p += 2;
 481
 482                         if (v == SMB2_ENCRYPTION_AES128_GCM) {
 483                                 aes_128_gcm_supported = true;
 484                         }
 485                         if (v == SMB2_ENCRYPTION_AES128_CCM) {
 486                                 aes_128_ccm_supported = true;
 487                         }
 488                 }
 489
 490                 /*
 491                  * For now we preferr CCM because our implementation
 492                  * is faster than GCM, see bug #11451.
 493                  */
 494                 if (aes_128_ccm_supported) {
 495                         xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
 496                 } else if (aes_128_gcm_supported) {
 497                         xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_GCM;
 498                 }
 499
 500                 SSVAL(buf, 0, 1); /* ChiperCount */
 501                 SSVAL(buf, 2, xconn->smb2.server.cipher);
 502
 503                 b = data_blob_const(buf, sizeof(buf));
 504                 status = smb2_negotiate_context_add(req, &out_c,
 505                                         SMB2_ENCRYPTION_CAPABILITIES, b);
 506                 if (!NT_STATUS_IS_OK(status)) {
 507                         return smbd_smb2_request_error(req, status);
 508                 }
 509         }
 510
 511         if (capabilities & SMB2_CAP_ENCRYPTION) {
 512                 xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
 513         }
 514
 515         if (protocol >= PROTOCOL_SMB2_22 &&
 516             xconn->client->server_multi_channel_enabled)
 517         {
 518                 if (in_capabilities & SMB2_CAP_MULTI_CHANNEL) {
 519                         capabilities |= SMB2_CAP_MULTI_CHANNEL;
 520                 }
 521         }
 522
 523         security_offset = SMB2_HDR_BODY + 0x40;
 524
 525 #if 1
 526         /* Try SPNEGO auth... */
 527         security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
 528                                           negprot_spnego_blob.length - 16);
 529 #else
 530         /* for now we want raw NTLMSSP */
 531         security_buffer = data_blob_const(NULL, 0);
 532 #endif
 533
 534         if (out_c.num_contexts != 0) {
 535                 status = smb2_negotiate_context_push(req,
 536                                                 &out_negotiate_context_blob,
 537                                                 out_c);
 538                 if (!NT_STATUS_IS_OK(status)) {
 539                         return smbd_smb2_request_error(req, status);
 540                 }
 541         }
 542
 543         if (out_negotiate_context_blob.length != 0) {
 544                 static const uint8_t zeros[8];
 545                 size_t pad = 0;
 546                 size_t ofs;
 547
 548                 outdyn = data_blob_dup_talloc(req, security_buffer);
 549                 if (outdyn.length != security_buffer.length) {
 550                         return smbd_smb2_request_error(req,
 551                                                 NT_STATUS_NO_MEMORY);
 552                 }
 553
 554                 ofs = security_offset + security_buffer.length;
 555                 if ((ofs % 8) != 0) {
 556                         pad = 8 - (ofs % 8);
 557                 }
 558                 ofs += pad;
 559
 560                 ok = data_blob_append(req, &outdyn, zeros, pad);
 561                 if (!ok) {
 562                         return smbd_smb2_request_error(req,
 563                                                 NT_STATUS_NO_MEMORY);
 564                 }
 565
 566                 ok = data_blob_append(req, &outdyn,
 567                                       out_negotiate_context_blob.data,
 568                                       out_negotiate_context_blob.length);
 569                 if (!ok) {
 570                         return smbd_smb2_request_error(req,
 571                                                 NT_STATUS_NO_MEMORY);
 572                 }
 573
 574                 out_negotiate_context_offset = ofs;
 575                 out_negotiate_context_count = out_c.num_contexts;
 576         } else {
 577                 outdyn = security_buffer;
 578         }
 579
 580         out_guid_blob = data_blob_const(negprot_spnego_blob.data, 16);
 581         status = GUID_from_ndr_blob(&out_guid_blob, &out_guid);
 582         if (!NT_STATUS_IS_OK(status)) {
 583                 return smbd_smb2_request_error(req, status);
 584         }
 585
 586         outbody = smbd_smb2_generate_outbody(req, 0x40);
 587         if (outbody.data == NULL) {
 588                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 589         }
 590
 591         SSVAL(outbody.data, 0x00, 0x40 + 1);    /* struct size */
 592         SSVAL(outbody.data, 0x02,
 593               security_mode);                   /* security mode */
 594         SSVAL(outbody.data, 0x04, dialect);     /* dialect revision */
 595         SSVAL(outbody.data, 0x06,
 596               out_negotiate_context_count);     /* reserved/NegotiateContextCount */
 597         memcpy(outbody.data + 0x08,
 598                out_guid_blob.data, 16); /* server guid */
 599         SIVAL(outbody.data, 0x18,
 600               capabilities);                    /* capabilities */
 601         SIVAL(outbody.data, 0x1C, max_trans);   /* max transact size */
 602         SIVAL(outbody.data, 0x20, max_read);    /* max read size */
 603         SIVAL(outbody.data, 0x24, max_write);   /* max write size */
 604         SBVAL(outbody.data, 0x28, now);         /* system time */
 605         SBVAL(outbody.data, 0x30, 0);           /* server start time */
 606         SSVAL(outbody.data, 0x38,
 607               security_offset);                 /* security buffer offset */
 608         SSVAL(outbody.data, 0x3A,
 609               security_buffer.length);          /* security buffer length */
 610         SIVAL(outbody.data, 0x3C,
 611               out_negotiate_context_offset);    /* reserved/NegotiateContextOffset */
 612
 613         req->sconn->using_smb2 = true;
 614
 615         if (dialect != SMB2_DIALECT_REVISION_2FF) {
 616                 struct smbXsrv_client_global0 *global0 = NULL;
 617
 618                 status = smbXsrv_connection_init_tables(xconn, protocol);
 619                 if (!NT_STATUS_IS_OK(status)) {
 620                         return smbd_smb2_request_error(req, status);
 621                 }
 622
 623                 xconn->smb2.client.capabilities = in_capabilities;
 624                 xconn->smb2.client.security_mode = in_security_mode;
 625                 xconn->smb2.client.guid = in_guid;
 626                 xconn->smb2.client.num_dialects = dialect_count;
 627                 xconn->smb2.client.dialects = talloc_array(xconn,
 628                                                            uint16_t,
 629                                                            dialect_count);
 630                 if (xconn->smb2.client.dialects == NULL) {
 631                         return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 632                 }
 633                 for (c=0; c < dialect_count; c++) {
 634                         xconn->smb2.client.dialects[c] = SVAL(indyn, c*2);
 635                 }
 636
 637                 xconn->smb2.server.capabilities = capabilities;
 638                 xconn->smb2.server.security_mode = security_mode;
 639                 xconn->smb2.server.guid = out_guid;
 640                 xconn->smb2.server.dialect = dialect;
 641                 xconn->smb2.server.max_trans = max_trans;
 642                 xconn->smb2.server.max_read  = max_read;
 643                 xconn->smb2.server.max_write = max_write;
 644
 645                 if (xconn->protocol < PROTOCOL_SMB2_10) {
 646                         /*
 647                          * SMB2_02 doesn't support client guids
 648                          */
 649                         return smbd_smb2_request_done(req, outbody, &outdyn);
 650                 }
 651
 652                 if (!xconn->client->server_multi_channel_enabled) {
 653                         /*
 654                          * Only deal with the client guid database
 655                          * if multi-channel is enabled.
 656                          */
 657                         return smbd_smb2_request_done(req, outbody, &outdyn);
 658                 }
 659
 660                 if (xconn->smb2.client.guid_verified) {
 661                         /*
 662                          * The connection was passed from another
 663                          * smbd process.
 664                          */
 665                         return smbd_smb2_request_done(req, outbody, &outdyn);
 666                 }
 667
 668                 status = smb2srv_client_lookup_global(xconn->client,
 669                                                 xconn->smb2.client.guid,
 670                                                 req, &global0);
 671                 /*
 672                  * TODO: check for races...
 673                  */
 674                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECTID_NOT_FOUND)) {
 675                         /*
 676                          * This stores the new client information in
 677                          * smbXsrv_client_global.tdb
 678                          */
 679                         xconn->client->global->client_guid =
 680                                                 xconn->smb2.client.guid;
 681                         status = smbXsrv_client_update(xconn->client);
 682                         if (!NT_STATUS_IS_OK(status)) {
 683                                 return status;
 684                         }
 685
 686                         xconn->smb2.client.guid_verified = true;
 687                 } else if (NT_STATUS_IS_OK(status)) {
 688                         status = smb2srv_client_connection_pass(req,
 689                                                                 global0);
 690                         if (!NT_STATUS_IS_OK(status)) {
 691                                 return smbd_smb2_request_error(req, status);
 692                         }
 693
 694                         smbd_server_connection_terminate(xconn,
 695                                                          "passed connection");
 696                         return NT_STATUS_OBJECTID_EXISTS;
 697                 } else {
 698                         return smbd_smb2_request_error(req, status);
 699                 }
 700         }
 701
 702         return smbd_smb2_request_done(req, outbody, &outdyn);
 703 }