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 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_SMB2
  32
  33 extern fstring remote_proto;
  34
  35 /*
  36  * this is the entry point if SMB2 is selected via
  37  * the SMB negprot and the given dialect.
  38  */
  39 static void reply_smb20xx(struct smb_request *req, uint16_t dialect)
  40 {
  41         uint8_t *smb2_inpdu;
  42         uint8_t *smb2_hdr;
  43         uint8_t *smb2_body;
  44         uint8_t *smb2_dyn;
  45         size_t len = SMB2_HDR_BODY + 0x24 + 2;
  46
  47         smb2_inpdu = talloc_zero_array(talloc_tos(), uint8_t, len);
  48         if (smb2_inpdu == NULL) {
  49                 DEBUG(0, ("Could not push spnego blob\n"));
  50                 reply_nterror(req, NT_STATUS_NO_MEMORY);
  51                 return;
  52         }
  53         smb2_hdr = smb2_inpdu;
  54         smb2_body = smb2_hdr + SMB2_HDR_BODY;
  55         smb2_dyn = smb2_body + 0x24;
  56
  57         SIVAL(smb2_hdr, SMB2_HDR_PROTOCOL_ID,   SMB2_MAGIC);
  58         SIVAL(smb2_hdr, SMB2_HDR_LENGTH,        SMB2_HDR_BODY);
  59
  60         SSVAL(smb2_body, 0x00, 0x0024); /* struct size */
  61         SSVAL(smb2_body, 0x02, 0x0001); /* dialect count */
  62
  63         SSVAL(smb2_dyn,  0x00, dialect);
  64
  65         req->outbuf = NULL;
  66
  67         smbd_smb2_process_negprot(req->xconn, 0, smb2_inpdu, len);
  68         return;
  69 }
  70
  71 /*
  72  * this is the entry point if SMB2 is selected via
  73  * the SMB negprot and the "SMB 2.002" dialect.
  74  */
  75 void reply_smb2002(struct smb_request *req, uint16_t choice)
  76 {
  77         reply_smb20xx(req, SMB2_DIALECT_REVISION_202);
  78 }
  79
  80 /*
  81  * this is the entry point if SMB2 is selected via
  82  * the SMB negprot and the "SMB 2.???" dialect.
  83  */
  84 void reply_smb20ff(struct smb_request *req, uint16_t choice)
  85 {
  86         struct smbXsrv_connection *xconn = req->xconn;
  87         xconn->smb2.allow_2ff = true;
  88         reply_smb20xx(req, SMB2_DIALECT_REVISION_2FF);
  89 }
  90
  91 enum protocol_types smbd_smb2_protocol_dialect_match(const uint8_t *indyn,
  92                                 const int dialect_count,
  93                                 uint16_t *dialect)
  94 {
  95         struct {
  96                 enum protocol_types proto;
  97                 uint16_t dialect;
  98         } pd[] = {
  99                 { PROTOCOL_SMB3_11, SMB3_DIALECT_REVISION_311 },
 100                 { PROTOCOL_SMB3_10, SMB3_DIALECT_REVISION_310 },
 101                 { PROTOCOL_SMB3_02, SMB3_DIALECT_REVISION_302 },
 102                 { PROTOCOL_SMB3_00, SMB3_DIALECT_REVISION_300 },
 103                 { PROTOCOL_SMB2_24, SMB2_DIALECT_REVISION_224 },
 104                 { PROTOCOL_SMB2_22, SMB2_DIALECT_REVISION_222 },
 105                 { PROTOCOL_SMB2_10, SMB2_DIALECT_REVISION_210 },
 106                 { PROTOCOL_SMB2_02, SMB2_DIALECT_REVISION_202 },
 107         };
 108         size_t i;
 109
 110         for (i = 0; i < ARRAY_SIZE(pd); i ++) {
 111                 size_t c = 0;
 112
 113                 if (lp_server_max_protocol() < pd[i].proto) {
 114                         continue;
 115                 }
 116                 if (lp_server_min_protocol() > pd[i].proto) {
 117                         continue;
 118                 }
 119
 120                 for (c = 0; c < dialect_count; c++) {
 121                         *dialect = SVAL(indyn, c*2);
 122                         if (*dialect == pd[i].dialect) {
 123                                 return pd[i].proto;
 124                         }
 125                 }
 126         }
 127
 128         return PROTOCOL_NONE;
 129 }
 130
 131 NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
 132 {
 133         struct smbXsrv_connection *xconn = req->xconn;
 134         struct smbXsrv_client_global0 *global0 = NULL;
 135         NTSTATUS status;
 136         const uint8_t *inbody;
 137         const uint8_t *indyn = NULL;
 138         DATA_BLOB outbody;
 139         DATA_BLOB outdyn;
 140         DATA_BLOB negprot_spnego_blob;
 141         uint16_t security_offset;
 142         DATA_BLOB security_buffer;
 143         size_t expected_dyn_size = 0;
 144         size_t c;
 145         uint16_t security_mode;
 146         uint16_t dialect_count;
 147         uint16_t in_security_mode;
 148         uint32_t in_capabilities;
 149         DATA_BLOB in_guid_blob;
 150         struct GUID in_guid;
 151         struct smb2_negotiate_contexts in_c = { .num_contexts = 0, };
 152         struct smb2_negotiate_context *in_preauth = NULL;
 153         struct smb2_negotiate_context *in_cipher = NULL;
 154         struct smb2_negotiate_contexts out_c = { .num_contexts = 0, };
 155         DATA_BLOB out_negotiate_context_blob = data_blob_null;
 156         uint32_t out_negotiate_context_offset = 0;
 157         uint16_t out_negotiate_context_count = 0;
 158         uint16_t dialect = 0;
 159         uint32_t capabilities;
 160         DATA_BLOB out_guid_blob;
 161         struct GUID out_guid;
 162         enum protocol_types protocol = PROTOCOL_NONE;
 163         uint32_t max_limit;
 164         uint32_t max_trans = lp_smb2_max_trans();
 165         uint32_t max_read = lp_smb2_max_read();
 166         uint32_t max_write = lp_smb2_max_write();
 167         NTTIME now = timeval_to_nttime(&req->request_time);
 168         bool signing_required = true;
 169         bool ok;
 170
 171         status = smbd_smb2_request_verify_sizes(req, 0x24);
 172         if (!NT_STATUS_IS_OK(status)) {
 173                 return smbd_smb2_request_error(req, status);
 174         }
 175         inbody = SMBD_SMB2_IN_BODY_PTR(req);
 176
 177         dialect_count = SVAL(inbody, 0x02);
 178
 179         in_security_mode = SVAL(inbody, 0x04);
 180         in_capabilities = IVAL(inbody, 0x08);
 181         in_guid_blob = data_blob_const(inbody + 0x0C, 16);
 182
 183         if (dialect_count == 0) {
 184                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 185         }
 186
 187         status = GUID_from_ndr_blob(&in_guid_blob, &in_guid);
 188         if (!NT_STATUS_IS_OK(status)) {
 189                 return smbd_smb2_request_error(req, status);
 190         }
 191
 192         expected_dyn_size = dialect_count * 2;
 193         if (SMBD_SMB2_IN_DYN_LEN(req) < expected_dyn_size) {
 194                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 195         }
 196         indyn = SMBD_SMB2_IN_DYN_PTR(req);
 197
 198         protocol = smbd_smb2_protocol_dialect_match(indyn,
 199                                         dialect_count,
 200                                         &dialect);
 201
 202         for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) {
 203                 if (lp_server_max_protocol() < PROTOCOL_SMB2_10) {
 204                         break;
 205                 }
 206
 207                 dialect = SVAL(indyn, c*2);
 208                 if (dialect == SMB2_DIALECT_REVISION_2FF) {
 209                         if (xconn->smb2.allow_2ff) {
 210                                 xconn->smb2.allow_2ff = false;
 211                                 protocol = PROTOCOL_SMB2_10;
 212                                 break;
 213                         }
 214                 }
 215         }
 216
 217         if (protocol == PROTOCOL_NONE) {
 218                 return smbd_smb2_request_error(req, NT_STATUS_NOT_SUPPORTED);
 219         }
 220
 221         if (protocol >= PROTOCOL_SMB3_10) {
 222                 uint32_t in_negotiate_context_offset = 0;
 223                 uint16_t in_negotiate_context_count = 0;
 224                 DATA_BLOB in_negotiate_context_blob = data_blob_null;
 225                 size_t ofs;
 226
 227                 in_negotiate_context_offset = IVAL(inbody, 0x1C);
 228                 in_negotiate_context_count = SVAL(inbody, 0x20);
 229
 230                 ofs = SMB2_HDR_BODY;
 231                 ofs += SMBD_SMB2_IN_BODY_LEN(req);
 232                 ofs += expected_dyn_size;
 233                 if ((ofs % 8) != 0) {
 234                         ofs += 8 - (ofs % 8);
 235                 }
 236
 237                 if (in_negotiate_context_offset != ofs) {
 238                         return smbd_smb2_request_error(req,
 239                                         NT_STATUS_INVALID_PARAMETER);
 240                 }
 241
 242                 ofs -= SMB2_HDR_BODY;
 243                 ofs -= SMBD_SMB2_IN_BODY_LEN(req);
 244
 245                 if (SMBD_SMB2_IN_DYN_LEN(req) < ofs) {
 246                         return smbd_smb2_request_error(req,
 247                                         NT_STATUS_INVALID_PARAMETER);
 248                 }
 249
 250                 in_negotiate_context_blob = data_blob_const(indyn,
 251                                                 SMBD_SMB2_IN_DYN_LEN(req));
 252
 253                 in_negotiate_context_blob.data += ofs;
 254                 in_negotiate_context_blob.length -= ofs;
 255
 256                 status = smb2_negotiate_context_parse(req,
 257                                         in_negotiate_context_blob, &in_c);
 258                 if (!NT_STATUS_IS_OK(status)) {
 259                         return smbd_smb2_request_error(req, status);
 260                 }
 261
 262                 if (in_negotiate_context_count != in_c.num_contexts) {
 263                         return smbd_smb2_request_error(req,
 264                                         NT_STATUS_INVALID_PARAMETER);
 265                 }
 266         }
 267
 268         if ((dialect != SMB2_DIALECT_REVISION_2FF) &&
 269             (protocol >= PROTOCOL_SMB2_10) &&
 270             !GUID_all_zero(&in_guid))
 271         {
 272                 ok = remote_arch_cache_update(&in_guid);
 273                 if (!ok) {
 274                         return smbd_smb2_request_error(
 275                                 req, NT_STATUS_UNSUCCESSFUL);
 276                 }
 277         }
 278
 279         switch (get_remote_arch()) {
 280         case RA_VISTA:
 281         case RA_SAMBA:
 282         case RA_CIFSFS:
 283         case RA_OSX:
 284                 break;
 285         default:
 286                 set_remote_arch(RA_VISTA);
 287                 break;
 288         }
 289
 290         fstr_sprintf(remote_proto, "SMB%X_%02X",
 291                      (dialect >> 8) & 0xFF, dialect & 0xFF);
 292
 293         reload_services(req->sconn, conn_snum_used, true);
 294         DEBUG(3,("Selected protocol %s\n", remote_proto));
 295
 296         in_preauth = smb2_negotiate_context_find(&in_c,
 297                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES);
 298         if (protocol >= PROTOCOL_SMB3_10 && in_preauth == NULL) {
 299                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 300         }
 301         in_cipher = smb2_negotiate_context_find(&in_c,
 302                                         SMB2_ENCRYPTION_CAPABILITIES);
 303
 304         /* negprot_spnego() returns a the server guid in the first 16 bytes */
 305         negprot_spnego_blob = negprot_spnego(req, xconn);
 306         if (negprot_spnego_blob.data == NULL) {
 307                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 308         }
 309
 310         if (negprot_spnego_blob.length < 16) {
 311                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 312         }
 313
 314         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 315         /*
 316          * We use xconn->smb1.signing_state as that's already present
 317          * and used lpcfg_server_signing_allowed() to get the correct
 318          * defaults, e.g. signing_required for an ad_dc.
 319          */
 320         signing_required = smb_signing_is_mandatory(xconn->smb1.signing_state);
 321         if (signing_required) {
 322                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 323         }
 324
 325         capabilities = 0;
 326         if (lp_host_msdfs()) {
 327                 capabilities |= SMB2_CAP_DFS;
 328         }
 329
 330         if (protocol >= PROTOCOL_SMB2_10 &&
 331             lp_smb2_leases() &&
 332             lp_oplocks(GLOBAL_SECTION_SNUM) &&
 333             !lp_kernel_oplocks(GLOBAL_SECTION_SNUM))
 334         {
 335                 capabilities |= SMB2_CAP_LEASING;
 336         }
 337
 338         if ((protocol >= PROTOCOL_SMB2_24) &&
 339             (lp_smb_encrypt(-1) != SMB_SIGNING_OFF) &&
 340             (in_capabilities & SMB2_CAP_ENCRYPTION)) {
 341                 capabilities |= SMB2_CAP_ENCRYPTION;
 342         }
 343
 344         /*
 345          * 0x10000 (65536) is the maximum allowed message size
 346          * for SMB 2.0
 347          */
 348         max_limit = 0x10000;
 349
 350         if (protocol >= PROTOCOL_SMB2_10) {
 351                 int p = 0;
 352
 353                 if (tsocket_address_is_inet(req->sconn->local_address, "ip")) {
 354                         p = tsocket_address_inet_port(req->sconn->local_address);
 355                 }
 356
 357                 /* largeMTU is not supported over NBT (tcp port 139) */
 358                 if (p != NBT_SMB_PORT) {
 359                         capabilities |= SMB2_CAP_LARGE_MTU;
 360                         xconn->smb2.credits.multicredit = true;
 361
 362                         /*
 363                          * We allow up to almost 16MB.
 364                          *
 365                          * The maximum PDU size is 0xFFFFFF (16776960)
 366                          * and we need some space for the header.
 367                          */
 368                         max_limit = 0xFFFF00;
 369                 }
 370         }
 371
 372         /*
 373          * the defaults are 8MB, but we'll limit this to max_limit based on
 374          * the dialect (64kb for SMB 2.0, 8MB for SMB >= 2.1 with LargeMTU)
 375          *
 376          * user configured values exceeding the limits will be overwritten,
 377          * only smaller values will be accepted
 378          */
 379
 380         max_trans = MIN(max_limit, lp_smb2_max_trans());
 381         max_read = MIN(max_limit, lp_smb2_max_read());
 382         max_write = MIN(max_limit, lp_smb2_max_write());
 383
 384         if (in_preauth != NULL) {
 385                 size_t needed = 4;
 386                 uint16_t hash_count;
 387                 uint16_t salt_length;
 388                 uint16_t selected_preauth = 0;
 389                 const uint8_t *p;
 390                 uint8_t buf[38];
 391                 DATA_BLOB b;
 392                 size_t i;
 393
 394                 if (in_preauth->data.length < needed) {
 395                         return smbd_smb2_request_error(req,
 396                                         NT_STATUS_INVALID_PARAMETER);
 397                 }
 398
 399                 hash_count = SVAL(in_preauth->data.data, 0);
 400                 salt_length = SVAL(in_preauth->data.data, 2);
 401
 402                 if (hash_count == 0) {
 403                         return smbd_smb2_request_error(req,
 404                                         NT_STATUS_INVALID_PARAMETER);
 405                 }
 406
 407                 p = in_preauth->data.data + needed;
 408                 needed += hash_count * 2;
 409                 needed += salt_length;
 410
 411                 if (in_preauth->data.length < needed) {
 412                         return smbd_smb2_request_error(req,
 413                                         NT_STATUS_INVALID_PARAMETER);
 414                 }
 415
 416                 for (i=0; i < hash_count; i++) {
 417                         uint16_t v;
 418
 419                         v = SVAL(p, 0);
 420                         p += 2;
 421
 422                         if (v == SMB2_PREAUTH_INTEGRITY_SHA512) {
 423                                 selected_preauth = v;
 424                                 break;
 425                         }
 426                 }
 427
 428                 if (selected_preauth == 0) {
 429                         return smbd_smb2_request_error(req,
 430                                 NT_STATUS_SMB_NO_PREAUTH_INTEGRITY_HASH_OVERLAP);
 431                 }
 432
 433                 SSVAL(buf, 0,  1); /* HashAlgorithmCount */
 434                 SSVAL(buf, 2, 32); /* SaltLength */
 435                 SSVAL(buf, 4, selected_preauth);
 436                 generate_random_buffer(buf + 6, 32);
 437
 438                 b = data_blob_const(buf, sizeof(buf));
 439                 status = smb2_negotiate_context_add(req, &out_c,
 440                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES, b);
 441                 if (!NT_STATUS_IS_OK(status)) {
 442                         return smbd_smb2_request_error(req, status);
 443                 }
 444
 445                 req->preauth = &req->xconn->smb2.preauth;
 446         }
 447
 448         if ((capabilities & SMB2_CAP_ENCRYPTION) && (in_cipher != NULL)) {
 449                 size_t needed = 2;
 450                 uint16_t cipher_count;
 451                 const uint8_t *p;
 452                 uint8_t buf[4];
 453                 DATA_BLOB b;
 454                 size_t i;
 455                 bool aes_128_ccm_supported = false;
 456                 bool aes_128_gcm_supported = false;
 457
 458                 capabilities &= ~SMB2_CAP_ENCRYPTION;
 459
 460                 if (in_cipher->data.length < needed) {
 461                         return smbd_smb2_request_error(req,
 462                                         NT_STATUS_INVALID_PARAMETER);
 463                 }
 464
 465                 cipher_count = SVAL(in_cipher->data.data, 0);
 466
 467                 if (cipher_count == 0) {
 468                         return smbd_smb2_request_error(req,
 469                                         NT_STATUS_INVALID_PARAMETER);
 470                 }
 471
 472                 p = in_cipher->data.data + needed;
 473                 needed += cipher_count * 2;
 474
 475                 if (in_cipher->data.length < needed) {
 476                         return smbd_smb2_request_error(req,
 477                                         NT_STATUS_INVALID_PARAMETER);
 478                 }
 479
 480                 for (i=0; i < cipher_count; i++) {
 481                         uint16_t v;
 482
 483                         v = SVAL(p, 0);
 484                         p += 2;
 485
 486                         if (v == SMB2_ENCRYPTION_AES128_GCM) {
 487                                 aes_128_gcm_supported = true;
 488                         }
 489                         if (v == SMB2_ENCRYPTION_AES128_CCM) {
 490                                 aes_128_ccm_supported = true;
 491                         }
 492                 }
 493
 494                 /*
 495                  * For now we preferr CCM because our implementation
 496                  * is faster than GCM, see bug #11451.
 497                  */
 498                 if (aes_128_ccm_supported) {
 499                         xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
 500                 } else if (aes_128_gcm_supported) {
 501                         xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_GCM;
 502                 }
 503
 504                 SSVAL(buf, 0, 1); /* ChiperCount */
 505                 SSVAL(buf, 2, xconn->smb2.server.cipher);
 506
 507                 b = data_blob_const(buf, sizeof(buf));
 508                 status = smb2_negotiate_context_add(req, &out_c,
 509                                         SMB2_ENCRYPTION_CAPABILITIES, b);
 510                 if (!NT_STATUS_IS_OK(status)) {
 511                         return smbd_smb2_request_error(req, status);
 512                 }
 513         }
 514
 515         if (capabilities & SMB2_CAP_ENCRYPTION) {
 516                 xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
 517         }
 518
 519         if (protocol >= PROTOCOL_SMB2_22 &&
 520             xconn->client->server_multi_channel_enabled)
 521         {
 522                 if (in_capabilities & SMB2_CAP_MULTI_CHANNEL) {
 523                         capabilities |= SMB2_CAP_MULTI_CHANNEL;
 524                 }
 525         }
 526
 527         security_offset = SMB2_HDR_BODY + 0x40;
 528
 529 #if 1
 530         /* Try SPNEGO auth... */
 531         security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
 532                                           negprot_spnego_blob.length - 16);
 533 #else
 534         /* for now we want raw NTLMSSP */
 535         security_buffer = data_blob_const(NULL, 0);
 536 #endif
 537
 538         if (out_c.num_contexts != 0) {
 539                 status = smb2_negotiate_context_push(req,
 540                                                 &out_negotiate_context_blob,
 541                                                 out_c);
 542                 if (!NT_STATUS_IS_OK(status)) {
 543                         return smbd_smb2_request_error(req, status);
 544                 }
 545         }
 546
 547         if (out_negotiate_context_blob.length != 0) {
 548                 static const uint8_t zeros[8];
 549                 size_t pad = 0;
 550                 size_t ofs;
 551
 552                 outdyn = data_blob_dup_talloc(req, security_buffer);
 553                 if (outdyn.length != security_buffer.length) {
 554                         return smbd_smb2_request_error(req,
 555                                                 NT_STATUS_NO_MEMORY);
 556                 }
 557
 558                 ofs = security_offset + security_buffer.length;
 559                 if ((ofs % 8) != 0) {
 560                         pad = 8 - (ofs % 8);
 561                 }
 562                 ofs += pad;
 563
 564                 ok = data_blob_append(req, &outdyn, zeros, pad);
 565                 if (!ok) {
 566                         return smbd_smb2_request_error(req,
 567                                                 NT_STATUS_NO_MEMORY);
 568                 }
 569
 570                 ok = data_blob_append(req, &outdyn,
 571                                       out_negotiate_context_blob.data,
 572                                       out_negotiate_context_blob.length);
 573                 if (!ok) {
 574                         return smbd_smb2_request_error(req,
 575                                                 NT_STATUS_NO_MEMORY);
 576                 }
 577
 578                 out_negotiate_context_offset = ofs;
 579                 out_negotiate_context_count = out_c.num_contexts;
 580         } else {
 581                 outdyn = security_buffer;
 582         }
 583
 584         out_guid_blob = data_blob_const(negprot_spnego_blob.data, 16);
 585         status = GUID_from_ndr_blob(&out_guid_blob, &out_guid);
 586         if (!NT_STATUS_IS_OK(status)) {
 587                 return smbd_smb2_request_error(req, status);
 588         }
 589
 590         outbody = smbd_smb2_generate_outbody(req, 0x40);
 591         if (outbody.data == NULL) {
 592                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 593         }
 594
 595         SSVAL(outbody.data, 0x00, 0x40 + 1);    /* struct size */
 596         SSVAL(outbody.data, 0x02,
 597               security_mode);                   /* security mode */
 598         SSVAL(outbody.data, 0x04, dialect);     /* dialect revision */
 599         SSVAL(outbody.data, 0x06,
 600               out_negotiate_context_count);     /* reserved/NegotiateContextCount */
 601         memcpy(outbody.data + 0x08,
 602                out_guid_blob.data, 16); /* server guid */
 603         SIVAL(outbody.data, 0x18,
 604               capabilities);                    /* capabilities */
 605         SIVAL(outbody.data, 0x1C, max_trans);   /* max transact size */
 606         SIVAL(outbody.data, 0x20, max_read);    /* max read size */
 607         SIVAL(outbody.data, 0x24, max_write);   /* max write size */
 608         SBVAL(outbody.data, 0x28, now);         /* system time */
 609         SBVAL(outbody.data, 0x30, 0);           /* server start time */
 610         SSVAL(outbody.data, 0x38,
 611               security_offset);                 /* security buffer offset */
 612         SSVAL(outbody.data, 0x3A,
 613               security_buffer.length);          /* security buffer length */
 614         SIVAL(outbody.data, 0x3C,
 615               out_negotiate_context_offset);    /* reserved/NegotiateContextOffset */
 616
 617         req->sconn->using_smb2 = true;
 618
 619         if (dialect == SMB2_DIALECT_REVISION_2FF) {
 620                 return smbd_smb2_request_done(req, outbody, &outdyn);
 621         }
 622
 623         status = smbXsrv_connection_init_tables(xconn, protocol);
 624         if (!NT_STATUS_IS_OK(status)) {
 625                 return smbd_smb2_request_error(req, status);
 626         }
 627
 628         xconn->smb2.client.capabilities = in_capabilities;
 629         xconn->smb2.client.security_mode = in_security_mode;
 630         xconn->smb2.client.guid = in_guid;
 631         xconn->smb2.client.num_dialects = dialect_count;
 632         xconn->smb2.client.dialects = talloc_array(xconn,
 633                                                    uint16_t,
 634                                                    dialect_count);
 635         if (xconn->smb2.client.dialects == NULL) {
 636                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 637         }
 638         for (c=0; c < dialect_count; c++) {
 639                 xconn->smb2.client.dialects[c] = SVAL(indyn, c*2);
 640         }
 641
 642         xconn->smb2.server.capabilities = capabilities;
 643         xconn->smb2.server.security_mode = security_mode;
 644         xconn->smb2.server.guid = out_guid;
 645         xconn->smb2.server.dialect = dialect;
 646         xconn->smb2.server.max_trans = max_trans;
 647         xconn->smb2.server.max_read  = max_read;
 648         xconn->smb2.server.max_write = max_write;
 649
 650         if (xconn->protocol < PROTOCOL_SMB2_10) {
 651                 /*
 652                  * SMB2_02 doesn't support client guids
 653                  */
 654                 return smbd_smb2_request_done(req, outbody, &outdyn);
 655         }
 656
 657         if (!xconn->client->server_multi_channel_enabled) {
 658                 /*
 659                  * Only deal with the client guid database
 660                  * if multi-channel is enabled.
 661                  */
 662                 return smbd_smb2_request_done(req, outbody, &outdyn);
 663         }
 664
 665         if (xconn->smb2.client.guid_verified) {
 666                 /*
 667                  * The connection was passed from another
 668                  * smbd process.
 669                  */
 670                 return smbd_smb2_request_done(req, outbody, &outdyn);
 671         }
 672
 673         status = smb2srv_client_lookup_global(xconn->client,
 674                                               xconn->smb2.client.guid,
 675                                               req, &global0);
 676         /*
 677          * TODO: check for races...
 678          */
 679         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECTID_NOT_FOUND)) {
 680                 /*
 681                  * This stores the new client information in
 682                  * smbXsrv_client_global.tdb
 683                  */
 684                 xconn->client->global->client_guid =
 685                         xconn->smb2.client.guid;
 686                 status = smbXsrv_client_update(xconn->client);
 687                 if (!NT_STATUS_IS_OK(status)) {
 688                         return status;
 689                 }
 690
 691                 xconn->smb2.client.guid_verified = true;
 692         } else if (NT_STATUS_IS_OK(status)) {
 693                 status = smb2srv_client_connection_pass(req,
 694                                                         global0);
 695                 if (!NT_STATUS_IS_OK(status)) {
 696                         return smbd_smb2_request_error(req, status);
 697                 }
 698
 699                 smbd_server_connection_terminate(xconn,
 700                                                  "passed connection");
 701                 return NT_STATUS_OBJECTID_EXISTS;
 702         } else {
 703                 return smbd_smb2_request_error(req, status);
 704         }
 705
 706         return smbd_smb2_request_done(req, outbody, &outdyn);
 707 }