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 NTSTATUS 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 NT_STATUS_NO_MEMORY;
  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         return smbd_smb2_process_negprot(req->xconn, 0, smb2_inpdu, len);
  68 }
  69
  70 /*
  71  * this is the entry point if SMB2 is selected via
  72  * the SMB negprot and the "SMB 2.002" dialect.
  73  */
  74 NTSTATUS reply_smb2002(struct smb_request *req, uint16_t choice)
  75 {
  76         return reply_smb20xx(req, SMB2_DIALECT_REVISION_202);
  77 }
  78
  79 /*
  80  * this is the entry point if SMB2 is selected via
  81  * the SMB negprot and the "SMB 2.???" dialect.
  82  */
  83 NTSTATUS reply_smb20ff(struct smb_request *req, uint16_t choice)
  84 {
  85         struct smbXsrv_connection *xconn = req->xconn;
  86         xconn->smb2.allow_2ff = true;
  87         return reply_smb20xx(req, SMB2_DIALECT_REVISION_2FF);
  88 }
  89
  90 enum protocol_types smbd_smb2_protocol_dialect_match(const uint8_t *indyn,
  91                                 const int dialect_count,
  92                                 uint16_t *dialect)
  93 {
  94         struct {
  95                 enum protocol_types proto;
  96                 uint16_t dialect;
  97         } pd[] = {
  98                 { PROTOCOL_SMB3_11, SMB3_DIALECT_REVISION_311 },
  99                 { PROTOCOL_SMB3_02, SMB3_DIALECT_REVISION_302 },
 100                 { PROTOCOL_SMB3_00, SMB3_DIALECT_REVISION_300 },
 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                 int 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 struct smbd_smb2_request_process_negprot_state {
 128         struct smbd_smb2_request *req;
 129         DATA_BLOB outbody;
 130         DATA_BLOB outdyn;
 131 };
 132
 133 static void smbd_smb2_request_process_negprot_mc_done(struct tevent_req *subreq);
 134
 135 NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
 136 {
 137         struct smbd_smb2_request_process_negprot_state *state = NULL;
 138         struct smbXsrv_connection *xconn = req->xconn;
 139         struct tevent_req *subreq = NULL;
 140         NTSTATUS status;
 141         const uint8_t *inbody;
 142         const uint8_t *indyn = NULL;
 143         DATA_BLOB outbody;
 144         DATA_BLOB outdyn;
 145         DATA_BLOB negprot_spnego_blob;
 146         uint16_t security_offset;
 147         DATA_BLOB security_buffer;
 148         size_t expected_dyn_size = 0;
 149         size_t c;
 150         uint16_t security_mode;
 151         uint16_t dialect_count;
 152         uint16_t in_security_mode;
 153         uint32_t in_capabilities;
 154         DATA_BLOB in_guid_blob;
 155         struct GUID in_guid;
 156         struct smb2_negotiate_contexts in_c = { .num_contexts = 0, };
 157         struct smb2_negotiate_context *in_preauth = NULL;
 158         struct smb2_negotiate_context *in_cipher = NULL;
 159         struct smb2_negotiate_context *in_sign_algo = NULL;
 160         struct smb2_negotiate_contexts out_c = { .num_contexts = 0, };
 161         const struct smb311_capabilities default_smb3_capabilities =
 162                 smb311_capabilities_parse("server",
 163                         lp_server_smb3_signing_algorithms(),
 164                         lp_server_smb3_encryption_algorithms());
 165         DATA_BLOB out_negotiate_context_blob = data_blob_null;
 166         uint32_t out_negotiate_context_offset = 0;
 167         uint16_t out_negotiate_context_count = 0;
 168         uint16_t dialect = 0;
 169         uint32_t capabilities;
 170         DATA_BLOB out_guid_blob;
 171         struct GUID out_guid;
 172         enum protocol_types protocol = PROTOCOL_NONE;
 173         uint32_t max_limit;
 174         uint32_t max_trans = lp_smb2_max_trans();
 175         uint32_t max_read = lp_smb2_max_read();
 176         uint32_t max_write = lp_smb2_max_write();
 177         NTTIME now = timeval_to_nttime(&req->request_time);
 178         bool signing_required = true;
 179         bool ok;
 180
 181         status = smbd_smb2_request_verify_sizes(req, 0x24);
 182         if (!NT_STATUS_IS_OK(status)) {
 183                 return smbd_smb2_request_error(req, status);
 184         }
 185         inbody = SMBD_SMB2_IN_BODY_PTR(req);
 186
 187         dialect_count = SVAL(inbody, 0x02);
 188
 189         in_security_mode = SVAL(inbody, 0x04);
 190         in_capabilities = IVAL(inbody, 0x08);
 191         in_guid_blob = data_blob_const(inbody + 0x0C, 16);
 192
 193         if (dialect_count == 0) {
 194                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 195         }
 196
 197         status = GUID_from_ndr_blob(&in_guid_blob, &in_guid);
 198         if (!NT_STATUS_IS_OK(status)) {
 199                 return smbd_smb2_request_error(req, status);
 200         }
 201
 202         expected_dyn_size = dialect_count * 2;
 203         if (SMBD_SMB2_IN_DYN_LEN(req) < expected_dyn_size) {
 204                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 205         }
 206         indyn = SMBD_SMB2_IN_DYN_PTR(req);
 207
 208         protocol = smbd_smb2_protocol_dialect_match(indyn,
 209                                         dialect_count,
 210                                         &dialect);
 211
 212         for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) {
 213                 if (lp_server_max_protocol() < PROTOCOL_SMB2_10) {
 214                         break;
 215                 }
 216
 217                 dialect = SVAL(indyn, c*2);
 218                 if (dialect == SMB2_DIALECT_REVISION_2FF) {
 219                         if (xconn->smb2.allow_2ff) {
 220                                 xconn->smb2.allow_2ff = false;
 221                                 protocol = PROTOCOL_SMB2_10;
 222                                 break;
 223                         }
 224                 }
 225         }
 226
 227         if (protocol == PROTOCOL_NONE) {
 228                 return smbd_smb2_request_error(req, NT_STATUS_NOT_SUPPORTED);
 229         }
 230
 231         if (protocol >= PROTOCOL_SMB3_11) {
 232                 uint32_t in_negotiate_context_offset = 0;
 233                 uint16_t in_negotiate_context_count = 0;
 234                 DATA_BLOB in_negotiate_context_blob = data_blob_null;
 235                 size_t ofs;
 236
 237                 in_negotiate_context_offset = IVAL(inbody, 0x1C);
 238                 in_negotiate_context_count = SVAL(inbody, 0x20);
 239
 240                 ofs = SMB2_HDR_BODY;
 241                 ofs += SMBD_SMB2_IN_BODY_LEN(req);
 242                 ofs += expected_dyn_size;
 243                 if ((ofs % 8) != 0) {
 244                         ofs += 8 - (ofs % 8);
 245                 }
 246
 247                 if (in_negotiate_context_offset != ofs) {
 248                         return smbd_smb2_request_error(req,
 249                                         NT_STATUS_INVALID_PARAMETER);
 250                 }
 251
 252                 ofs -= SMB2_HDR_BODY;
 253                 ofs -= SMBD_SMB2_IN_BODY_LEN(req);
 254
 255                 if (SMBD_SMB2_IN_DYN_LEN(req) < ofs) {
 256                         return smbd_smb2_request_error(req,
 257                                         NT_STATUS_INVALID_PARAMETER);
 258                 }
 259
 260                 in_negotiate_context_blob = data_blob_const(indyn,
 261                                                 SMBD_SMB2_IN_DYN_LEN(req));
 262
 263                 in_negotiate_context_blob.data += ofs;
 264                 in_negotiate_context_blob.length -= ofs;
 265
 266                 status = smb2_negotiate_context_parse(req,
 267                                                       in_negotiate_context_blob,
 268                                                       in_negotiate_context_count,
 269                                                       &in_c);
 270                 if (!NT_STATUS_IS_OK(status)) {
 271                         return smbd_smb2_request_error(req, status);
 272                 }
 273         }
 274
 275         if ((dialect != SMB2_DIALECT_REVISION_2FF) &&
 276             (protocol >= PROTOCOL_SMB2_10) &&
 277             !GUID_all_zero(&in_guid))
 278         {
 279                 ok = remote_arch_cache_update(&in_guid);
 280                 if (!ok) {
 281                         return smbd_smb2_request_error(
 282                                 req, NT_STATUS_UNSUCCESSFUL);
 283                 }
 284         }
 285
 286         switch (get_remote_arch()) {
 287         case RA_VISTA:
 288         case RA_SAMBA:
 289         case RA_CIFSFS:
 290         case RA_OSX:
 291                 break;
 292         default:
 293                 set_remote_arch(RA_VISTA);
 294                 break;
 295         }
 296
 297         fstr_sprintf(remote_proto, "SMB%X_%02X",
 298                      (dialect >> 8) & 0xFF, dialect & 0xFF);
 299
 300         reload_services(req->sconn, conn_snum_used, true);
 301         DEBUG(3,("Selected protocol %s\n", remote_proto));
 302
 303         in_preauth = smb2_negotiate_context_find(&in_c,
 304                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES);
 305         if (protocol >= PROTOCOL_SMB3_11 && in_preauth == NULL) {
 306                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 307         }
 308         in_cipher = smb2_negotiate_context_find(&in_c,
 309                                         SMB2_ENCRYPTION_CAPABILITIES);
 310         in_sign_algo = smb2_negotiate_context_find(&in_c,
 311                                         SMB2_SIGNING_CAPABILITIES);
 312
 313         /* negprot_spnego() returns a the server guid in the first 16 bytes */
 314         negprot_spnego_blob = negprot_spnego(req, xconn);
 315         if (negprot_spnego_blob.data == NULL) {
 316                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 317         }
 318
 319         if (negprot_spnego_blob.length < 16) {
 320                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 321         }
 322
 323         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 324         /*
 325          * We use xconn->smb1.signing_state as that's already present
 326          * and used lpcfg_server_signing_allowed() to get the correct
 327          * defaults, e.g. signing_required for an ad_dc.
 328          */
 329         signing_required = smb_signing_is_mandatory(xconn->smb1.signing_state);
 330         if (signing_required) {
 331                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 332         }
 333
 334         capabilities = 0;
 335         if (lp_host_msdfs()) {
 336                 capabilities |= SMB2_CAP_DFS;
 337         }
 338
 339         if (protocol >= PROTOCOL_SMB2_10 &&
 340             lp_smb2_leases() &&
 341             lp_oplocks(GLOBAL_SECTION_SNUM) &&
 342             !lp_kernel_oplocks(GLOBAL_SECTION_SNUM))
 343         {
 344                 capabilities |= SMB2_CAP_LEASING;
 345         }
 346
 347         if ((protocol >= PROTOCOL_SMB3_00) &&
 348             (lp_server_smb_encrypt(-1) != SMB_ENCRYPTION_OFF) &&
 349             (in_capabilities & SMB2_CAP_ENCRYPTION)) {
 350                 capabilities |= SMB2_CAP_ENCRYPTION;
 351         }
 352
 353         /*
 354          * 0x10000 (65536) is the maximum allowed message size
 355          * for SMB 2.0
 356          */
 357         max_limit = 0x10000;
 358
 359         if (protocol >= PROTOCOL_SMB2_10) {
 360                 int p = 0;
 361
 362                 if (tsocket_address_is_inet(req->sconn->local_address, "ip")) {
 363                         p = tsocket_address_inet_port(req->sconn->local_address);
 364                 }
 365
 366                 /* largeMTU is not supported over NBT (tcp port 139) */
 367                 if (p != NBT_SMB_PORT) {
 368                         capabilities |= SMB2_CAP_LARGE_MTU;
 369                         xconn->smb2.credits.multicredit = true;
 370
 371                         /*
 372                          * We allow up to almost 16MB.
 373                          *
 374                          * The maximum PDU size is 0xFFFFFF (16776960)
 375                          * and we need some space for the header.
 376                          */
 377                         max_limit = 0xFFFF00;
 378                 }
 379         }
 380
 381         /*
 382          * the defaults are 8MB, but we'll limit this to max_limit based on
 383          * the dialect (64kb for SMB 2.0, 8MB for SMB >= 2.1 with LargeMTU)
 384          *
 385          * user configured values exceeding the limits will be overwritten,
 386          * only smaller values will be accepted
 387          */
 388
 389         max_trans = MIN(max_limit, lp_smb2_max_trans());
 390         max_read = MIN(max_limit, lp_smb2_max_read());
 391         max_write = MIN(max_limit, lp_smb2_max_write());
 392
 393         if (in_preauth != NULL) {
 394                 size_t needed = 4;
 395                 uint16_t hash_count;
 396                 uint16_t salt_length;
 397                 uint16_t selected_preauth = 0;
 398                 const uint8_t *p;
 399                 uint8_t buf[38];
 400                 size_t i;
 401
 402                 if (in_preauth->data.length < needed) {
 403                         return smbd_smb2_request_error(req,
 404                                         NT_STATUS_INVALID_PARAMETER);
 405                 }
 406
 407                 hash_count = SVAL(in_preauth->data.data, 0);
 408                 salt_length = SVAL(in_preauth->data.data, 2);
 409
 410                 if (hash_count == 0) {
 411                         return smbd_smb2_request_error(req,
 412                                         NT_STATUS_INVALID_PARAMETER);
 413                 }
 414
 415                 p = in_preauth->data.data + needed;
 416                 needed += hash_count * 2;
 417                 needed += salt_length;
 418
 419                 if (in_preauth->data.length < needed) {
 420                         return smbd_smb2_request_error(req,
 421                                         NT_STATUS_INVALID_PARAMETER);
 422                 }
 423
 424                 for (i=0; i < hash_count; i++) {
 425                         uint16_t v;
 426
 427                         v = SVAL(p, 0);
 428                         p += 2;
 429
 430                         if (v == SMB2_PREAUTH_INTEGRITY_SHA512) {
 431                                 selected_preauth = v;
 432                                 break;
 433                         }
 434                 }
 435
 436                 if (selected_preauth == 0) {
 437                         return smbd_smb2_request_error(req,
 438                                 NT_STATUS_SMB_NO_PREAUTH_INTEGRITY_HASH_OVERLAP);
 439                 }
 440
 441                 SSVAL(buf, 0,  1); /* HashAlgorithmCount */
 442                 SSVAL(buf, 2, 32); /* SaltLength */
 443                 SSVAL(buf, 4, selected_preauth);
 444                 generate_random_buffer(buf + 6, 32);
 445
 446                 status = smb2_negotiate_context_add(
 447                         req,
 448                         &out_c,
 449                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES,
 450                         buf,
 451                         sizeof(buf));
 452                 if (!NT_STATUS_IS_OK(status)) {
 453                         return smbd_smb2_request_error(req, status);
 454                 }
 455
 456                 req->preauth = &req->xconn->smb2.preauth;
 457         }
 458
 459         if (protocol >= PROTOCOL_SMB3_00) {
 460                 xconn->smb2.server.sign_algo = SMB2_SIGNING_AES128_CMAC;
 461         } else {
 462                 xconn->smb2.server.sign_algo = SMB2_SIGNING_HMAC_SHA256;
 463         }
 464
 465         if ((capabilities & SMB2_CAP_ENCRYPTION) && (in_cipher != NULL)) {
 466                 const struct smb3_encryption_capabilities *srv_ciphers =
 467                         &default_smb3_capabilities.encryption;
 468                 uint16_t srv_preferred_idx = UINT16_MAX;
 469                 size_t needed = 2;
 470                 uint16_t cipher_count;
 471                 const uint8_t *p;
 472                 uint8_t buf[4];
 473                 size_t i;
 474
 475                 capabilities &= ~SMB2_CAP_ENCRYPTION;
 476
 477                 if (in_cipher->data.length < needed) {
 478                         return smbd_smb2_request_error(req,
 479                                         NT_STATUS_INVALID_PARAMETER);
 480                 }
 481
 482                 cipher_count = SVAL(in_cipher->data.data, 0);
 483                 if (cipher_count == 0) {
 484                         return smbd_smb2_request_error(req,
 485                                         NT_STATUS_INVALID_PARAMETER);
 486                 }
 487
 488                 p = in_cipher->data.data + needed;
 489                 needed += cipher_count * 2;
 490
 491                 if (in_cipher->data.length < needed) {
 492                         return smbd_smb2_request_error(req,
 493                                         NT_STATUS_INVALID_PARAMETER);
 494                 }
 495
 496                 for (i=0; i < cipher_count; i++) {
 497                         uint16_t si;
 498                         uint16_t v;
 499
 500                         v = SVAL(p, 0);
 501                         p += 2;
 502
 503                         for (si = 0; si < srv_ciphers->num_algos; si++) {
 504                                 if (srv_ciphers->algos[si] != v) {
 505                                         continue;
 506                                 }
 507
 508                                 /*
 509                                  * The server ciphers are listed
 510                                  * with the lowest idx being preferred.
 511                                  */
 512                                 if (si < srv_preferred_idx) {
 513                                         srv_preferred_idx = si;
 514                                 }
 515                                 break;
 516                         }
 517                 }
 518
 519                 if (srv_preferred_idx != UINT16_MAX) {
 520                         xconn->smb2.server.cipher =
 521                                 srv_ciphers->algos[srv_preferred_idx];
 522                 }
 523
 524                 SSVAL(buf, 0, 1); /* ChiperCount */
 525                 SSVAL(buf, 2, xconn->smb2.server.cipher);
 526
 527                 status = smb2_negotiate_context_add(
 528                         req,
 529                         &out_c,
 530                         SMB2_ENCRYPTION_CAPABILITIES,
 531                         buf,
 532                         sizeof(buf));
 533                 if (!NT_STATUS_IS_OK(status)) {
 534                         return smbd_smb2_request_error(req, status);
 535                 }
 536         }
 537
 538         if (capabilities & SMB2_CAP_ENCRYPTION) {
 539                 xconn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
 540         }
 541
 542         if (in_sign_algo != NULL) {
 543                 const struct smb3_signing_capabilities *srv_sign_algos =
 544                         &default_smb3_capabilities.signing;
 545                 uint16_t srv_preferred_idx = UINT16_MAX;
 546                 size_t needed = 2;
 547                 uint16_t sign_algo_count;
 548                 const uint8_t *p;
 549                 size_t i;
 550
 551                 if (in_sign_algo->data.length < needed) {
 552                         return smbd_smb2_request_error(req,
 553                                         NT_STATUS_INVALID_PARAMETER);
 554                 }
 555
 556                 sign_algo_count = SVAL(in_sign_algo->data.data, 0);
 557                 if (sign_algo_count == 0) {
 558                         return smbd_smb2_request_error(req,
 559                                         NT_STATUS_INVALID_PARAMETER);
 560                 }
 561
 562                 p = in_sign_algo->data.data + needed;
 563                 needed += sign_algo_count * 2;
 564
 565                 if (in_sign_algo->data.length < needed) {
 566                         return smbd_smb2_request_error(req,
 567                                         NT_STATUS_INVALID_PARAMETER);
 568                 }
 569
 570                 for (i=0; i < sign_algo_count; i++) {
 571                         uint16_t si;
 572                         uint16_t v;
 573
 574                         v = SVAL(p, 0);
 575                         p += 2;
 576
 577                         for (si = 0; si < srv_sign_algos->num_algos; si++) {
 578                                 if (srv_sign_algos->algos[si] != v) {
 579                                         continue;
 580                                 }
 581
 582                                 /*
 583                                  * The server sign_algos are listed
 584                                  * with the lowest idx being preferred.
 585                                  */
 586                                 if (si < srv_preferred_idx) {
 587                                         srv_preferred_idx = si;
 588                                 }
 589                                 break;
 590                         }
 591                 }
 592
 593                 /*
 594                  * If we found a match announce it
 595                  * otherwise we'll keep the default
 596                  * of SMB2_SIGNING_AES128_CMAC
 597                  */
 598                 if (srv_preferred_idx != UINT16_MAX) {
 599                         uint8_t buf[4];
 600
 601                         xconn->smb2.server.sign_algo =
 602                                 srv_sign_algos->algos[srv_preferred_idx];
 603
 604                         SSVAL(buf, 0, 1); /* SigningAlgorithmCount */
 605                         SSVAL(buf, 2, xconn->smb2.server.sign_algo);
 606
 607                         status = smb2_negotiate_context_add(
 608                                 req,
 609                                 &out_c,
 610                                 SMB2_SIGNING_CAPABILITIES,
 611                                 buf,
 612                                 sizeof(buf));
 613                         if (!NT_STATUS_IS_OK(status)) {
 614                                 return smbd_smb2_request_error(req, status);
 615                         }
 616                 }
 617         }
 618
 619         status = smb311_capabilities_check(&default_smb3_capabilities,
 620                                            "smb2srv_negprot",
 621                                            DBGLVL_NOTICE,
 622                                            NT_STATUS_INVALID_PARAMETER,
 623                                            "server",
 624                                            protocol,
 625                                            xconn->smb2.server.sign_algo,
 626                                            xconn->smb2.server.cipher);
 627         if (!NT_STATUS_IS_OK(status)) {
 628                 return smbd_smb2_request_error(req, status);
 629         }
 630
 631         if (protocol >= PROTOCOL_SMB3_00 &&
 632             xconn->client->server_multi_channel_enabled)
 633         {
 634                 if (in_capabilities & SMB2_CAP_MULTI_CHANNEL) {
 635                         capabilities |= SMB2_CAP_MULTI_CHANNEL;
 636                 }
 637         }
 638
 639         security_offset = SMB2_HDR_BODY + 0x40;
 640
 641 #if 1
 642         /* Try SPNEGO auth... */
 643         security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
 644                                           negprot_spnego_blob.length - 16);
 645 #else
 646         /* for now we want raw NTLMSSP */
 647         security_buffer = data_blob_const(NULL, 0);
 648 #endif
 649
 650         if (out_c.num_contexts != 0) {
 651                 status = smb2_negotiate_context_push(req,
 652                                                 &out_negotiate_context_blob,
 653                                                 out_c);
 654                 if (!NT_STATUS_IS_OK(status)) {
 655                         return smbd_smb2_request_error(req, status);
 656                 }
 657         }
 658
 659         if (out_negotiate_context_blob.length != 0) {
 660                 static const uint8_t zeros[8];
 661                 size_t pad = 0;
 662                 size_t ofs;
 663
 664                 outdyn = data_blob_dup_talloc(req, security_buffer);
 665                 if (outdyn.length != security_buffer.length) {
 666                         return smbd_smb2_request_error(req,
 667                                                 NT_STATUS_NO_MEMORY);
 668                 }
 669
 670                 ofs = security_offset + security_buffer.length;
 671                 if ((ofs % 8) != 0) {
 672                         pad = 8 - (ofs % 8);
 673                 }
 674                 ofs += pad;
 675
 676                 ok = data_blob_append(req, &outdyn, zeros, pad);
 677                 if (!ok) {
 678                         return smbd_smb2_request_error(req,
 679                                                 NT_STATUS_NO_MEMORY);
 680                 }
 681
 682                 ok = data_blob_append(req, &outdyn,
 683                                       out_negotiate_context_blob.data,
 684                                       out_negotiate_context_blob.length);
 685                 if (!ok) {
 686                         return smbd_smb2_request_error(req,
 687                                                 NT_STATUS_NO_MEMORY);
 688                 }
 689
 690                 out_negotiate_context_offset = ofs;
 691                 out_negotiate_context_count = out_c.num_contexts;
 692         } else {
 693                 outdyn = security_buffer;
 694         }
 695
 696         out_guid_blob = data_blob_const(negprot_spnego_blob.data, 16);
 697         status = GUID_from_ndr_blob(&out_guid_blob, &out_guid);
 698         if (!NT_STATUS_IS_OK(status)) {
 699                 return smbd_smb2_request_error(req, status);
 700         }
 701
 702         outbody = smbd_smb2_generate_outbody(req, 0x40);
 703         if (outbody.data == NULL) {
 704                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 705         }
 706
 707         SSVAL(outbody.data, 0x00, 0x40 + 1);    /* struct size */
 708         SSVAL(outbody.data, 0x02,
 709               security_mode);                   /* security mode */
 710         SSVAL(outbody.data, 0x04, dialect);     /* dialect revision */
 711         SSVAL(outbody.data, 0x06,
 712               out_negotiate_context_count);     /* reserved/NegotiateContextCount */
 713         memcpy(outbody.data + 0x08,
 714                out_guid_blob.data, 16); /* server guid */
 715         SIVAL(outbody.data, 0x18,
 716               capabilities);                    /* capabilities */
 717         SIVAL(outbody.data, 0x1C, max_trans);   /* max transact size */
 718         SIVAL(outbody.data, 0x20, max_read);    /* max read size */
 719         SIVAL(outbody.data, 0x24, max_write);   /* max write size */
 720         SBVAL(outbody.data, 0x28, now);         /* system time */
 721         SBVAL(outbody.data, 0x30, 0);           /* server start time */
 722         SSVAL(outbody.data, 0x38,
 723               security_offset);                 /* security buffer offset */
 724         SSVAL(outbody.data, 0x3A,
 725               security_buffer.length);          /* security buffer length */
 726         SIVAL(outbody.data, 0x3C,
 727               out_negotiate_context_offset);    /* reserved/NegotiateContextOffset */
 728
 729         req->sconn->using_smb2 = true;
 730
 731         if (dialect == SMB2_DIALECT_REVISION_2FF) {
 732                 return smbd_smb2_request_done(req, outbody, &outdyn);
 733         }
 734
 735         status = smbXsrv_connection_init_tables(xconn, protocol);
 736         if (!NT_STATUS_IS_OK(status)) {
 737                 return smbd_smb2_request_error(req, status);
 738         }
 739
 740         xconn->smb2.client.capabilities = in_capabilities;
 741         xconn->smb2.client.security_mode = in_security_mode;
 742         xconn->smb2.client.guid = in_guid;
 743         xconn->smb2.client.num_dialects = dialect_count;
 744         xconn->smb2.client.dialects = talloc_array(xconn,
 745                                                    uint16_t,
 746                                                    dialect_count);
 747         if (xconn->smb2.client.dialects == NULL) {
 748                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 749         }
 750         for (c=0; c < dialect_count; c++) {
 751                 xconn->smb2.client.dialects[c] = SVAL(indyn, c*2);
 752         }
 753
 754         xconn->smb2.server.capabilities = capabilities;
 755         xconn->smb2.server.security_mode = security_mode;
 756         xconn->smb2.server.guid = out_guid;
 757         xconn->smb2.server.dialect = dialect;
 758         xconn->smb2.server.max_trans = max_trans;
 759         xconn->smb2.server.max_read  = max_read;
 760         xconn->smb2.server.max_write = max_write;
 761
 762         if (xconn->protocol < PROTOCOL_SMB2_10) {
 763                 /*
 764                  * SMB2_02 doesn't support client guids
 765                  */
 766                 return smbd_smb2_request_done(req, outbody, &outdyn);
 767         }
 768
 769         if (!xconn->client->server_multi_channel_enabled) {
 770                 /*
 771                  * Only deal with the client guid database
 772                  * if multi-channel is enabled.
 773                  *
 774                  * But we still need to setup
 775                  * xconn->client->global->client_guid to
 776                  * the correct value.
 777                  */
 778                 xconn->client->global->client_guid =
 779                         xconn->smb2.client.guid;
 780                 return smbd_smb2_request_done(req, outbody, &outdyn);
 781         }
 782
 783         if (xconn->smb2.client.guid_verified) {
 784                 /*
 785                  * The connection was passed from another
 786                  * smbd process.
 787                  */
 788                 return smbd_smb2_request_done(req, outbody, &outdyn);
 789         }
 790
 791         state = talloc_zero(req, struct smbd_smb2_request_process_negprot_state);
 792         if (state == NULL) {
 793                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 794         }
 795         *state = (struct smbd_smb2_request_process_negprot_state) {
 796                 .req = req,
 797                 .outbody = outbody,
 798                 .outdyn = outdyn,
 799         };
 800
 801         subreq = smb2srv_client_mc_negprot_send(state,
 802                                                 req->xconn->client->raw_ev_ctx,
 803                                                 req);
 804         if (subreq == NULL) {
 805                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 806         }
 807         tevent_req_set_callback(subreq,
 808                                 smbd_smb2_request_process_negprot_mc_done,
 809                                 state);
 810         return NT_STATUS_OK;
 811 }
 812
 813 static void smbd_smb2_request_process_negprot_mc_done(struct tevent_req *subreq)
 814 {
 815         struct smbd_smb2_request_process_negprot_state *state =
 816                 tevent_req_callback_data(subreq,
 817                 struct smbd_smb2_request_process_negprot_state);
 818         struct smbd_smb2_request *req = state->req;
 819         struct smbXsrv_connection *xconn = req->xconn;
 820         NTSTATUS status;
 821
 822         status = smb2srv_client_mc_negprot_recv(subreq);
 823         TALLOC_FREE(subreq);
 824         if (NT_STATUS_EQUAL(status, NT_STATUS_MESSAGE_RETRIEVED)) {
 825                 /*
 826                  * The connection was passed to another process
 827                  */
 828                 smbd_server_connection_terminate(xconn,
 829                                                  "passed connection");
 830                 /*
 831                  * smbd_server_connection_terminate() should not return!
 832                  */
 833                 smb_panic(__location__);
 834                 return;
 835         }
 836         if (!NT_STATUS_IS_OK(status)) {
 837                 status = smbd_smb2_request_error(req, status);
 838                 if (NT_STATUS_IS_OK(status)) {
 839                         return;
 840                 }
 841
 842                 /*
 843                  * The connection was passed to another process
 844                  */
 845                 smbd_server_connection_terminate(xconn, nt_errstr(status));
 846                 /*
 847                  * smbd_server_connection_terminate() should not return!
 848                  */
 849                 smb_panic(__location__);
 850                 return;
 851         }
 852
 853         /*
 854          * We're the first connection...
 855          */
 856         status = smbd_smb2_request_done(req, state->outbody, &state->outdyn);
 857         if (NT_STATUS_IS_OK(status)) {
 858                 return;
 859         }
 860
 861         /*
 862          * The connection was passed to another process
 863          */
 864         smbd_server_connection_terminate(xconn, nt_errstr(status));
 865         /*
 866          * smbd_server_connection_terminate() should not return!
 867          */
 868         smb_panic(__location__);
 869         return;
 870 }