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         if (get_remote_arch() != RA_SAMBA) {
 262                 set_remote_arch(RA_VISTA);
 263         }
 264
 265         fstr_sprintf(remote_proto, "SMB%X_%02X",
 266                      (dialect >> 8) & 0xFF, dialect & 0xFF);
 267
 268         reload_services(req->sconn, conn_snum_used, true);
 269         DEBUG(3,("Selected protocol %s\n", remote_proto));
 270
 271         in_preauth = smb2_negotiate_context_find(&in_c,
 272                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES);
 273         if (protocol >= PROTOCOL_SMB3_10 && in_preauth == NULL) {
 274                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 275         }
 276         in_cipher = smb2_negotiate_context_find(&in_c,
 277                                         SMB2_ENCRYPTION_CAPABILITIES);
 278
 279         /* negprot_spnego() returns a the server guid in the first 16 bytes */
 280         negprot_spnego_blob = negprot_spnego(req, xconn);
 281         if (negprot_spnego_blob.data == NULL) {
 282                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 283         }
 284
 285         if (negprot_spnego_blob.length < 16) {
 286                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 287         }
 288
 289         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 290         if (lp_server_signing() == SMB_SIGNING_REQUIRED) {
 291                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 292         }
 293
 294         capabilities = 0;
 295         if (lp_host_msdfs()) {
 296                 capabilities |= SMB2_CAP_DFS;
 297         }
 298
 299         if (protocol >= PROTOCOL_SMB2_10 &&
 300             lp_smb2_leases() &&
 301             lp_oplocks(GLOBAL_SECTION_SNUM) &&
 302             !lp_kernel_oplocks(GLOBAL_SECTION_SNUM))
 303         {
 304                 capabilities |= SMB2_CAP_LEASING;
 305         }
 306
 307         if ((protocol >= PROTOCOL_SMB2_24) &&
 308             (lp_smb_encrypt(-1) != SMB_SIGNING_OFF) &&
 309             (in_capabilities & SMB2_CAP_ENCRYPTION)) {
 310                 capabilities |= SMB2_CAP_ENCRYPTION;
 311         }
 312
 313         /*
 314          * 0x10000 (65536) is the maximum allowed message size
 315          * for SMB 2.0
 316          */
 317         max_limit = 0x10000;
 318
 319         if (protocol >= PROTOCOL_SMB2_10) {
 320                 int p = 0;
 321
 322                 if (tsocket_address_is_inet(req->sconn->local_address, "ip")) {
 323                         p = tsocket_address_inet_port(req->sconn->local_address);
 324                 }
 325
 326                 /* largeMTU is not supported over NBT (tcp port 139) */
 327                 if (p != NBT_SMB_PORT) {
 328                         capabilities |= SMB2_CAP_LARGE_MTU;
 329                         xconn->smb2.credits.multicredit = true;
 330
 331                         /*
 332                          * We allow up to almost 16MB.
 333                          *
 334                          * The maximum PDU size is 0xFFFFFF (16776960)
 335                          * and we need some space for the header.
 336                          */
 337                         max_limit = 0xFFFF00;
 338                 }
 339         }
 340
 341         /*
 342          * the defaults are 8MB, but we'll limit this to max_limit based on
 343          * the dialect (64kb for SMB 2.0, 8MB for SMB >= 2.1 with LargeMTU)
 344          *
 345          * user configured values exceeding the limits will be overwritten,
 346          * only smaller values will be accepted
 347          */
 348
 349         max_trans = MIN(max_limit, lp_smb2_max_trans());
 350         max_read = MIN(max_limit, lp_smb2_max_read());
 351         max_write = MIN(max_limit, lp_smb2_max_write());
 352
 353         if (in_preauth != NULL) {
 354                 size_t needed = 4;
 355                 uint16_t hash_count;
 356                 uint16_t salt_length;
 357                 uint16_t selected_preauth = 0;
 358                 const uint8_t *p;
 359                 uint8_t buf[38];
 360                 DATA_BLOB b;
 361                 size_t i;
 362
 363                 if (in_preauth->data.length < needed) {
 364                         return smbd_smb2_request_error(req,
 365                                         NT_STATUS_INVALID_PARAMETER);
 366                 }
 367
 368                 hash_count = SVAL(in_preauth->data.data, 0);
 369                 salt_length = SVAL(in_preauth->data.data, 2);
 370
 371                 if (hash_count == 0) {
 372                         return smbd_smb2_request_error(req,
 373                                         NT_STATUS_INVALID_PARAMETER);
 374                 }
 375
 376                 p = in_preauth->data.data + needed;
 377                 needed += hash_count * 2;
 378                 needed += salt_length;
 379
 380                 if (in_preauth->data.length < needed) {
 381                         return smbd_smb2_request_error(req,
 382                                         NT_STATUS_INVALID_PARAMETER);
 383                 }
 384
 385                 for (i=0; i < hash_count; i++) {
 386                         uint16_t v;
 387
 388                         v = SVAL(p, 0);
 389                         p += 2;
 390
 391                         if (v == SMB2_PREAUTH_INTEGRITY_SHA512) {
 392                                 selected_preauth = v;
 393                                 break;
 394                         }
 395                 }
 396
 397                 if (selected_preauth == 0) {
 398                         return smbd_smb2_request_error(req,
 399                                 NT_STATUS_SMB_NO_PREAUTH_INTEGRITY_HASH_OVERLAP);
 400                 }
 401
 402                 SSVAL(buf, 0,  1); /* HashAlgorithmCount */
 403                 SSVAL(buf, 2, 32); /* SaltLength */
 404                 SSVAL(buf, 4, selected_preauth);
 405                 generate_random_buffer(buf + 6, 32);
 406
 407                 b = data_blob_const(buf, sizeof(buf));
 408                 status = smb2_negotiate_context_add(req, &out_c,
 409                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES, b);
 410                 if (!NT_STATUS_IS_OK(status)) {
 411                         return smbd_smb2_request_error(req, status);
 412                 }
 413
 414                 req->preauth = &req->xconn->smb2.preauth;
 415         }
 416
 417         if (in_cipher != NULL) {
 418                 size_t needed = 2;
 419                 uint16_t cipher_count;
 420                 const uint8_t *p;
 421                 uint8_t buf[4];
 422                 DATA_BLOB b;
 423                 size_t i;
 424                 bool aes_128_ccm_supported = false;
 425                 bool aes_128_gcm_supported = false;
 426
 427                 capabilities &= ~SMB2_CAP_ENCRYPTION;
 428
 429                 if (in_cipher->data.length < needed) {
 430                         return smbd_smb2_request_error(req,
 431                                         NT_STATUS_INVALID_PARAMETER);
 432                 }
 433
 434                 cipher_count = SVAL(in_cipher->data.data, 0);
 435
 436                 if (cipher_count == 0) {
 437                         return smbd_smb2_request_error(req,
 438                                         NT_STATUS_INVALID_PARAMETER);
 439                 }
 440
 441                 p = in_cipher->data.data + needed;
 442                 needed += cipher_count * 2;
 443
 444                 if (in_cipher->data.length < needed) {
 445                         return smbd_smb2_request_error(req,
 446                                         NT_STATUS_INVALID_PARAMETER);
 447                 }
 448
 449                 for (i=0; i < cipher_count; i++) {
 450                         uint16_t v;
 451
 452                         v = SVAL(p, 0);
 453                         p += 2;
 454
 455                         if (v == SMB2_ENCRYPTION_AES128_GCM) {
 456                                 aes_128_gcm_supported = true;
 457                         }
 458                         if (v == SMB2_ENCRYPTION_AES128_CCM) {
 459                                 aes_128_ccm_supported = true;
 460                         }
 461                 }
 462
 463                 /*
 464                  * For now we preferr CCM because our implementation
 465                  * is faster than GCM, see bug #11451.
 466                  */
 467                 if (aes_128_ccm_supported) {
 468                         xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
 469                 } else if (aes_128_gcm_supported) {
 470                         xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_GCM;
 471                 }
 472
 473                 SSVAL(buf, 0, 1); /* ChiperCount */
 474                 SSVAL(buf, 2, xconn->smb2.server.cipher);
 475
 476                 b = data_blob_const(buf, sizeof(buf));
 477                 status = smb2_negotiate_context_add(req, &out_c,
 478                                         SMB2_ENCRYPTION_CAPABILITIES, b);
 479                 if (!NT_STATUS_IS_OK(status)) {
 480                         return smbd_smb2_request_error(req, status);
 481                 }
 482         }
 483
 484         if (capabilities & SMB2_CAP_ENCRYPTION) {
 485                 xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
 486         }
 487
 488         security_offset = SMB2_HDR_BODY + 0x40;
 489
 490 #if 1
 491         /* Try SPNEGO auth... */
 492         security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
 493                                           negprot_spnego_blob.length - 16);
 494 #else
 495         /* for now we want raw NTLMSSP */
 496         security_buffer = data_blob_const(NULL, 0);
 497 #endif
 498
 499         if (out_c.num_contexts != 0) {
 500                 status = smb2_negotiate_context_push(req,
 501                                                 &out_negotiate_context_blob,
 502                                                 out_c);
 503                 if (!NT_STATUS_IS_OK(status)) {
 504                         return smbd_smb2_request_error(req, status);
 505                 }
 506         }
 507
 508         if (out_negotiate_context_blob.length != 0) {
 509                 static const uint8_t zeros[8];
 510                 size_t pad = 0;
 511                 size_t ofs;
 512                 bool ok;
 513
 514                 outdyn = data_blob_dup_talloc(req, security_buffer);
 515                 if (outdyn.length != security_buffer.length) {
 516                         return smbd_smb2_request_error(req,
 517                                                 NT_STATUS_NO_MEMORY);
 518                 }
 519
 520                 ofs = security_offset + security_buffer.length;
 521                 if ((ofs % 8) != 0) {
 522                         pad = 8 - (ofs % 8);
 523                 }
 524                 ofs += pad;
 525
 526                 ok = data_blob_append(req, &outdyn, zeros, pad);
 527                 if (!ok) {
 528                         return smbd_smb2_request_error(req,
 529                                                 NT_STATUS_NO_MEMORY);
 530                 }
 531
 532                 ok = data_blob_append(req, &outdyn,
 533                                       out_negotiate_context_blob.data,
 534                                       out_negotiate_context_blob.length);
 535                 if (!ok) {
 536                         return smbd_smb2_request_error(req,
 537                                                 NT_STATUS_NO_MEMORY);
 538                 }
 539
 540                 out_negotiate_context_offset = ofs;
 541                 out_negotiate_context_count = out_c.num_contexts;
 542         } else {
 543                 outdyn = security_buffer;
 544         }
 545
 546         out_guid_blob = data_blob_const(negprot_spnego_blob.data, 16);
 547         status = GUID_from_ndr_blob(&out_guid_blob, &out_guid);
 548         if (!NT_STATUS_IS_OK(status)) {
 549                 return smbd_smb2_request_error(req, status);
 550         }
 551
 552         outbody = smbd_smb2_generate_outbody(req, 0x40);
 553         if (outbody.data == NULL) {
 554                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 555         }
 556
 557         SSVAL(outbody.data, 0x00, 0x40 + 1);    /* struct size */
 558         SSVAL(outbody.data, 0x02,
 559               security_mode);                   /* security mode */
 560         SSVAL(outbody.data, 0x04, dialect);     /* dialect revision */
 561         SSVAL(outbody.data, 0x06,
 562               out_negotiate_context_count);     /* reserved/NegotiateContextCount */
 563         memcpy(outbody.data + 0x08,
 564                out_guid_blob.data, 16); /* server guid */
 565         SIVAL(outbody.data, 0x18,
 566               capabilities);                    /* capabilities */
 567         SIVAL(outbody.data, 0x1C, max_trans);   /* max transact size */
 568         SIVAL(outbody.data, 0x20, max_read);    /* max read size */
 569         SIVAL(outbody.data, 0x24, max_write);   /* max write size */
 570         SBVAL(outbody.data, 0x28, now);         /* system time */
 571         SBVAL(outbody.data, 0x30, 0);           /* server start time */
 572         SSVAL(outbody.data, 0x38,
 573               security_offset);                 /* security buffer offset */
 574         SSVAL(outbody.data, 0x3A,
 575               security_buffer.length);          /* security buffer length */
 576         SIVAL(outbody.data, 0x3C,
 577               out_negotiate_context_offset);    /* reserved/NegotiateContextOffset */
 578
 579         req->sconn->using_smb2 = true;
 580
 581         if (dialect != SMB2_DIALECT_REVISION_2FF) {
 582                 status = smbXsrv_connection_init_tables(xconn, protocol);
 583                 if (!NT_STATUS_IS_OK(status)) {
 584                         return smbd_smb2_request_error(req, status);
 585                 }
 586
 587                 xconn->smb2.client.capabilities = in_capabilities;
 588                 xconn->smb2.client.security_mode = in_security_mode;
 589                 xconn->smb2.client.guid = in_guid;
 590                 xconn->smb2.client.num_dialects = dialect_count;
 591                 xconn->smb2.client.dialects = talloc_array(xconn,
 592                                                            uint16_t,
 593                                                            dialect_count);
 594                 if (xconn->smb2.client.dialects == NULL) {
 595                         return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 596                 }
 597                 for (c=0; c < dialect_count; c++) {
 598                         xconn->smb2.client.dialects[c] = SVAL(indyn, c*2);
 599                 }
 600
 601                 xconn->smb2.server.capabilities = capabilities;
 602                 xconn->smb2.server.security_mode = security_mode;
 603                 xconn->smb2.server.guid = out_guid;
 604                 xconn->smb2.server.dialect = dialect;
 605                 xconn->smb2.server.max_trans = max_trans;
 606                 xconn->smb2.server.max_read  = max_read;
 607                 xconn->smb2.server.max_write = max_write;
 608         }
 609
 610         return smbd_smb2_request_done(req, outbody, &outdyn);
 611 }