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