source4/smb_server/smb2/receive.c

   1 /*
   2    Unix SMB2 implementation.
   3
   4    Copyright (C) Andrew Tridgell        2005
   5    Copyright (C) Stefan Metzmacher      2005
   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 "system/time.h"
  23 #include "libcli/smb2/smb2.h"
  24 #include "libcli/smb2/smb2_calls.h"
  25 #include "smb_server/smb_server.h"
  26 #include "smb_server/smb2/smb2_server.h"
  27 #include "smbd/service_stream.h"
  28 #include "lib/stream/packet.h"
  29 #include "ntvfs/ntvfs.h"
  30 #include "param/param.h"
  31 #include "auth/auth.h"
  32
  33
  34 /* fill in the bufinfo */
  35 void smb2srv_setup_bufinfo(struct smb2srv_request *req)
  36 {
  37         req->in.bufinfo.mem_ctx    = req;
  38         req->in.bufinfo.flags      = BUFINFO_FLAG_UNICODE | BUFINFO_FLAG_SMB2;
  39         req->in.bufinfo.align_base = req->in.buffer;
  40         if (req->in.dynamic) {
  41                 req->in.bufinfo.data       = req->in.dynamic;
  42                 req->in.bufinfo.data_size  = req->in.body_size - req->in.body_fixed;
  43         } else {
  44                 req->in.bufinfo.data       = NULL;
  45                 req->in.bufinfo.data_size  = 0;
  46         }
  47 }
  48
  49 static int smb2srv_request_destructor(struct smb2srv_request *req)
  50 {
  51         DLIST_REMOVE(req->smb_conn->requests2.list, req);
  52         if (req->pending_id) {
  53                 idr_remove(req->smb_conn->requests2.idtree_req, req->pending_id);
  54         }
  55         return 0;
  56 }
  57
  58 static int smb2srv_request_deny_destructor(struct smb2srv_request *req)
  59 {
  60         return -1;
  61 }
  62
  63 struct smb2srv_request *smb2srv_init_request(struct smbsrv_connection *smb_conn)
  64 {
  65         struct smb2srv_request *req;
  66
  67         req = talloc_zero(smb_conn, struct smb2srv_request);
  68         if (!req) return NULL;
  69
  70         req->smb_conn = smb_conn;
  71
  72         req->chained_session_id = UINT64_MAX;
  73         req->chained_tree_id = UINT32_MAX;
  74
  75         talloc_set_destructor(req, smb2srv_request_destructor);
  76
  77         return req;
  78 }
  79
  80 NTSTATUS smb2srv_setup_reply(struct smb2srv_request *req, uint16_t body_fixed_size,
  81                              bool body_dynamic_present, uint32_t body_dynamic_size)
  82 {
  83         uint32_t flags = IVAL(req->in.hdr, SMB2_HDR_FLAGS);
  84         uint32_t pid = IVAL(req->in.hdr, SMB2_HDR_PID);
  85         uint32_t tid = IVAL(req->in.hdr, SMB2_HDR_TID);
  86         uint16_t credits = SVAL(req->in.hdr, SMB2_HDR_CREDIT);
  87
  88         if (credits == 0) {
  89                 credits = 1;
  90         }
  91
  92         flags |= SMB2_HDR_FLAG_REDIRECT;
  93
  94         if (req->pending_id) {
  95                 flags |= SMB2_HDR_FLAG_ASYNC;
  96                 pid = req->pending_id;
  97                 tid = 0;
  98                 credits = 0;
  99         }
 100
 101         if (body_dynamic_present) {
 102                 if (body_dynamic_size == 0) {
 103                         body_dynamic_size = 1;
 104                 }
 105         } else {
 106                 body_dynamic_size = 0;
 107         }
 108
 109         req->out.size           = SMB2_HDR_BODY+NBT_HDR_SIZE+body_fixed_size;
 110
 111         req->out.allocated      = req->out.size + body_dynamic_size;
 112         req->out.buffer         = talloc_array(req, uint8_t,
 113                                                req->out.allocated);
 114         NT_STATUS_HAVE_NO_MEMORY(req->out.buffer);
 115
 116         req->out.hdr            = req->out.buffer       + NBT_HDR_SIZE;
 117         req->out.body           = req->out.hdr          + SMB2_HDR_BODY;
 118         req->out.body_fixed     = body_fixed_size;
 119         req->out.body_size      = body_fixed_size;
 120         req->out.dynamic        = (body_dynamic_size ? req->out.body + body_fixed_size : NULL);
 121
 122         SIVAL(req->out.hdr, 0,                          SMB2_MAGIC);
 123         SSVAL(req->out.hdr, SMB2_HDR_LENGTH,            SMB2_HDR_BODY);
 124         SSVAL(req->out.hdr, SMB2_HDR_CREDIT_CHARGE,
 125               SVAL(req->in.hdr, SMB2_HDR_CREDIT_CHARGE));
 126         SIVAL(req->out.hdr, SMB2_HDR_STATUS,            NT_STATUS_V(req->status));
 127         SSVAL(req->out.hdr, SMB2_HDR_OPCODE,            SVAL(req->in.hdr, SMB2_HDR_OPCODE));
 128         SSVAL(req->out.hdr, SMB2_HDR_CREDIT,            credits);
 129         SIVAL(req->out.hdr, SMB2_HDR_FLAGS,             flags);
 130         SIVAL(req->out.hdr, SMB2_HDR_NEXT_COMMAND,      0);
 131         SBVAL(req->out.hdr, SMB2_HDR_MESSAGE_ID,        req->seqnum);
 132         SIVAL(req->out.hdr, SMB2_HDR_PID,               pid);
 133         SIVAL(req->out.hdr, SMB2_HDR_TID,               tid);
 134         SBVAL(req->out.hdr, SMB2_HDR_SESSION_ID,        BVAL(req->in.hdr, SMB2_HDR_SESSION_ID));
 135         memcpy(req->out.hdr+SMB2_HDR_SIGNATURE,
 136                req->in.hdr+SMB2_HDR_SIGNATURE, 16);
 137
 138         /* set the length of the fixed body part and +1 if there's a dynamic part also */
 139         SSVAL(req->out.body, 0, body_fixed_size + (body_dynamic_size?1:0));
 140
 141         /*
 142          * if we have a dynamic part, make sure the first byte
 143          * which is always be part of the packet is initialized
 144          */
 145         if (body_dynamic_size) {
 146                 req->out.size += 1;
 147                 SCVAL(req->out.dynamic, 0, 0);
 148         }
 149
 150         return NT_STATUS_OK;
 151 }
 152
 153 static NTSTATUS smb2srv_reply(struct smb2srv_request *req);
 154
 155 static void smb2srv_chain_reply(struct smb2srv_request *p_req)
 156 {
 157         NTSTATUS status;
 158         struct smb2srv_request *req;
 159         uint32_t chain_offset;
 160         uint32_t protocol_version;
 161         uint16_t buffer_code;
 162         uint32_t dynamic_size;
 163         uint32_t flags;
 164         uint32_t last_hdr_offset;
 165
 166         last_hdr_offset = p_req->in.hdr - p_req->in.buffer;
 167
 168         chain_offset = p_req->chain_offset;
 169         p_req->chain_offset = 0;
 170
 171         if (p_req->in.size < (last_hdr_offset + chain_offset + SMB2_MIN_SIZE_NO_BODY)) {
 172                 DEBUG(2,("Invalid SMB2 chained packet at offset 0x%X from last hdr 0x%X\n",
 173                         chain_offset, last_hdr_offset));
 174                 smbsrv_terminate_connection(p_req->smb_conn, "Invalid SMB2 chained packet");
 175                 return;
 176         }
 177
 178         protocol_version = IVAL(p_req->in.buffer, last_hdr_offset + chain_offset);
 179         if (protocol_version != SMB2_MAGIC) {
 180                 DEBUG(2,("Invalid SMB chained packet: protocol prefix: 0x%08X\n",
 181                          protocol_version));
 182                 smbsrv_terminate_connection(p_req->smb_conn, "NON-SMB2 chained packet");
 183                 return;
 184         }
 185
 186         req = smb2srv_init_request(p_req->smb_conn);
 187         if (!req) {
 188                 smbsrv_terminate_connection(p_req->smb_conn, "SMB2 chained packet - no memory");
 189                 return;
 190         }
 191
 192         req->in.buffer          = talloc_steal(req, p_req->in.buffer);
 193         req->in.size            = p_req->in.size;
 194         req->request_time       = p_req->request_time;
 195         req->in.allocated       = req->in.size;
 196
 197         req->in.hdr             = req->in.buffer+ last_hdr_offset + chain_offset;
 198         req->in.body            = req->in.hdr   + SMB2_HDR_BODY;
 199         req->in.body_size       = req->in.size  - (last_hdr_offset+ chain_offset + SMB2_HDR_BODY);
 200         req->in.dynamic         = NULL;
 201
 202         req->seqnum             = BVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID);
 203
 204         if (req->in.body_size < 2) {
 205                 /* error handling for this is different for negprot to
 206                    other packet types */
 207                 uint16_t opcode = SVAL(req->in.hdr, SMB2_HDR_OPCODE);
 208                 if (opcode == SMB2_OP_NEGPROT) {
 209                         smbsrv_terminate_connection(req->smb_conn, "Bad body size in SMB2 negprot");
 210                 } else {
 211                         smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER);
 212                 }
 213         }
 214
 215         buffer_code             = SVAL(req->in.body, 0);
 216         req->in.body_fixed      = (buffer_code & ~1);
 217         dynamic_size            = req->in.body_size - req->in.body_fixed;
 218
 219         if (dynamic_size != 0 && (buffer_code & 1)) {
 220                 req->in.dynamic = req->in.body + req->in.body_fixed;
 221                 if (smb2_oob(&req->in, req->in.dynamic, dynamic_size)) {
 222                         DEBUG(1,("SMB2 chained request invalid dynamic size 0x%x\n",
 223                                  dynamic_size));
 224                         smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER);
 225                         return;
 226                 }
 227         }
 228
 229         smb2srv_setup_bufinfo(req);
 230
 231         flags = IVAL(req->in.hdr, SMB2_HDR_FLAGS);
 232         if (flags & SMB2_HDR_FLAG_CHAINED) {
 233                 if (p_req->chained_file_handle) {
 234                         memcpy(req->_chained_file_handle,
 235                                p_req->_chained_file_handle,
 236                                sizeof(req->_chained_file_handle));
 237                         req->chained_file_handle = req->_chained_file_handle;
 238                 }
 239                 req->chained_session_id = p_req->chained_session_id;
 240                 req->chained_tree_id = p_req->chained_tree_id;
 241                 req->chain_status = p_req->chain_status;
 242         }
 243
 244         /*
 245          * TODO: - make sure the length field is 64
 246          *       - make sure it's a request
 247          */
 248
 249         status = smb2srv_reply(req);
 250         if (!NT_STATUS_IS_OK(status)) {
 251                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 252                 talloc_free(req);
 253                 return;
 254         }
 255 }
 256
 257 void smb2srv_send_reply(struct smb2srv_request *req)
 258 {
 259         DATA_BLOB blob;
 260         NTSTATUS status;
 261
 262         if (req->smb_conn->connection->event.fde == NULL) {
 263                 /* the socket has been destroyed - no point trying to send a reply! */
 264                 talloc_free(req);
 265                 return;
 266         }
 267
 268         if (req->out.size > NBT_HDR_SIZE) {
 269                 _smb_setlen_tcp(req->out.buffer, req->out.size - NBT_HDR_SIZE);
 270         }
 271
 272         /* if signing is active on the session then sign the packet */
 273         if (req->is_signed) {
 274                 status = smb2_sign_message(&req->out,
 275                                            req->session->session_info->session_key);
 276                 if (!NT_STATUS_IS_OK(status)) {
 277                         smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 278                         return;
 279                 }
 280         }
 281
 282
 283         blob = data_blob_const(req->out.buffer, req->out.size);
 284         status = packet_send(req->smb_conn->packet, blob);
 285         if (!NT_STATUS_IS_OK(status)) {
 286                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 287         }
 288         if (req->chain_offset) {
 289                 smb2srv_chain_reply(req);
 290                 return;
 291         }
 292         talloc_free(req);
 293 }
 294
 295 void smb2srv_send_error(struct smb2srv_request *req, NTSTATUS error)
 296 {
 297         NTSTATUS status;
 298
 299         if (req->smb_conn->connection->event.fde == NULL) {
 300                 /* the socket has been destroyed - no point trying to send an error! */
 301                 talloc_free(req);
 302                 return;
 303         }
 304
 305         status = smb2srv_setup_reply(req, 8, true, 0);
 306         if (!NT_STATUS_IS_OK(status)) {
 307                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 308                 talloc_free(req);
 309                 return;
 310         }
 311
 312         SIVAL(req->out.hdr, SMB2_HDR_STATUS, NT_STATUS_V(error));
 313
 314         SSVAL(req->out.body, 0x02, 0);
 315         SIVAL(req->out.body, 0x04, 0);
 316
 317         req->chain_status = NT_STATUS_INVALID_PARAMETER;
 318
 319         smb2srv_send_reply(req);
 320 }
 321
 322 static NTSTATUS smb2srv_reply(struct smb2srv_request *req)
 323 {
 324         uint16_t opcode;
 325         uint32_t tid;
 326         uint64_t uid;
 327         uint32_t flags;
 328
 329         if (SVAL(req->in.hdr, SMB2_HDR_LENGTH) != SMB2_HDR_BODY) {
 330                 smbsrv_terminate_connection(req->smb_conn, "Invalid SMB2 header length");
 331                 return NT_STATUS_INVALID_PARAMETER;
 332         }
 333         opcode                  = SVAL(req->in.hdr, SMB2_HDR_OPCODE);
 334         req->chain_offset       = IVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND);
 335         req->seqnum             = BVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID);
 336         tid                     = IVAL(req->in.hdr, SMB2_HDR_TID);
 337         uid                     = BVAL(req->in.hdr, SMB2_HDR_SESSION_ID);
 338         flags                   = IVAL(req->in.hdr, SMB2_HDR_FLAGS);
 339
 340         if (opcode != SMB2_OP_CANCEL &&
 341             req->smb_conn->highest_smb2_seqnum != 0 &&
 342             req->seqnum <= req->smb_conn->highest_smb2_seqnum) {
 343                 smbsrv_terminate_connection(req->smb_conn, "Invalid SMB2 sequence number");
 344                 return NT_STATUS_INVALID_PARAMETER;
 345         }
 346         if (opcode != SMB2_OP_CANCEL) {
 347                 req->smb_conn->highest_smb2_seqnum = req->seqnum;
 348         }
 349
 350         if (flags & SMB2_HDR_FLAG_CHAINED) {
 351                 uid = req->chained_session_id;
 352                 tid = req->chained_tree_id;
 353         }
 354
 355         req->session    = smbsrv_session_find(req->smb_conn, uid, req->request_time);
 356         req->tcon       = smbsrv_smb2_tcon_find(req->session, tid, req->request_time);
 357
 358         req->chained_session_id = uid;
 359         req->chained_tree_id = tid;
 360
 361         errno = 0;
 362
 363         /* supporting signing is mandatory in SMB2, and is per-packet. So we
 364            should check the signature on any incoming packet that is signed, and
 365            should give a signed reply to any signed request */
 366         if (flags & SMB2_HDR_FLAG_SIGNED) {
 367                 NTSTATUS status;
 368
 369                 if (!req->session) goto nosession;
 370
 371                 req->is_signed = true;
 372                 status = smb2_check_signature(&req->in,
 373                                               req->session->session_info->session_key);
 374                 if (!NT_STATUS_IS_OK(status)) {
 375                         smb2srv_send_error(req, status);
 376                         return NT_STATUS_OK;
 377                 }
 378         } else if (req->session && req->session->smb2_signing.active) {
 379                 /* we require signing and this request was not signed */
 380                 smb2srv_send_error(req, NT_STATUS_ACCESS_DENIED);
 381                 return NT_STATUS_OK;
 382         }
 383
 384         if (!NT_STATUS_IS_OK(req->chain_status)) {
 385                 smb2srv_send_error(req, req->chain_status);
 386                 return NT_STATUS_OK;
 387         }
 388
 389         switch (opcode) {
 390         case SMB2_OP_NEGPROT:
 391                 smb2srv_negprot_recv(req);
 392                 return NT_STATUS_OK;
 393         case SMB2_OP_SESSSETUP:
 394                 smb2srv_sesssetup_recv(req);
 395                 return NT_STATUS_OK;
 396         case SMB2_OP_LOGOFF:
 397                 if (!req->session) goto nosession;
 398                 smb2srv_logoff_recv(req);
 399                 return NT_STATUS_OK;
 400         case SMB2_OP_TCON:
 401                 if (!req->session) goto nosession;
 402                 smb2srv_tcon_recv(req);
 403                 return NT_STATUS_OK;
 404         case SMB2_OP_TDIS:
 405                 if (!req->session) goto nosession;
 406                 if (!req->tcon) goto notcon;
 407                 smb2srv_tdis_recv(req);
 408                 return NT_STATUS_OK;
 409         case SMB2_OP_CREATE:
 410                 if (!req->session) goto nosession;
 411                 if (!req->tcon) goto notcon;
 412                 smb2srv_create_recv(req);
 413                 return NT_STATUS_OK;
 414         case SMB2_OP_CLOSE:
 415                 if (!req->session) goto nosession;
 416                 if (!req->tcon) goto notcon;
 417                 smb2srv_close_recv(req);
 418                 return NT_STATUS_OK;
 419         case SMB2_OP_FLUSH:
 420                 if (!req->session) goto nosession;
 421                 if (!req->tcon) goto notcon;
 422                 smb2srv_flush_recv(req);
 423                 return NT_STATUS_OK;
 424         case SMB2_OP_READ:
 425                 if (!req->session) goto nosession;
 426                 if (!req->tcon) goto notcon;
 427                 smb2srv_read_recv(req);
 428                 return NT_STATUS_OK;
 429         case SMB2_OP_WRITE:
 430                 if (!req->session) goto nosession;
 431                 if (!req->tcon) goto notcon;
 432                 smb2srv_write_recv(req);
 433                 return NT_STATUS_OK;
 434         case SMB2_OP_LOCK:
 435                 if (!req->session) goto nosession;
 436                 if (!req->tcon) goto notcon;
 437                 smb2srv_lock_recv(req);
 438                 return NT_STATUS_OK;
 439         case SMB2_OP_IOCTL:
 440                 if (!req->session) goto nosession;
 441                 if (!req->tcon) goto notcon;
 442                 smb2srv_ioctl_recv(req);
 443                 return NT_STATUS_OK;
 444         case SMB2_OP_CANCEL:
 445                 smb2srv_cancel_recv(req);
 446                 return NT_STATUS_OK;
 447         case SMB2_OP_KEEPALIVE:
 448                 smb2srv_keepalive_recv(req);
 449                 return NT_STATUS_OK;
 450         case SMB2_OP_FIND:
 451                 if (!req->session) goto nosession;
 452                 if (!req->tcon) goto notcon;
 453                 smb2srv_find_recv(req);
 454                 return NT_STATUS_OK;
 455         case SMB2_OP_NOTIFY:
 456                 if (!req->session) goto nosession;
 457                 if (!req->tcon) goto notcon;
 458                 smb2srv_notify_recv(req);
 459                 return NT_STATUS_OK;
 460         case SMB2_OP_GETINFO:
 461                 if (!req->session) goto nosession;
 462                 if (!req->tcon) goto notcon;
 463                 smb2srv_getinfo_recv(req);
 464                 return NT_STATUS_OK;
 465         case SMB2_OP_SETINFO:
 466                 if (!req->session) goto nosession;
 467                 if (!req->tcon) goto notcon;
 468                 smb2srv_setinfo_recv(req);
 469                 return NT_STATUS_OK;
 470         case SMB2_OP_BREAK:
 471                 if (!req->session) goto nosession;
 472                 if (!req->tcon) goto notcon;
 473                 smb2srv_break_recv(req);
 474                 return NT_STATUS_OK;
 475         }
 476
 477         DEBUG(1,("Invalid SMB2 opcode: 0x%04X\n", opcode));
 478         smbsrv_terminate_connection(req->smb_conn, "Invalid SMB2 opcode");
 479         return NT_STATUS_OK;
 480
 481 nosession:
 482         smb2srv_send_error(req, NT_STATUS_USER_SESSION_DELETED);
 483         return NT_STATUS_OK;
 484 notcon:
 485         smb2srv_send_error(req, NT_STATUS_NETWORK_NAME_DELETED);
 486         return NT_STATUS_OK;
 487 }
 488
 489 NTSTATUS smbsrv_recv_smb2_request(void *private_data, DATA_BLOB blob)
 490 {
 491         struct smbsrv_connection *smb_conn = talloc_get_type(private_data, struct smbsrv_connection);
 492         struct smb2srv_request *req;
 493         struct timeval cur_time = timeval_current();
 494         uint32_t protocol_version;
 495         uint16_t buffer_code;
 496         uint32_t dynamic_size;
 497         uint32_t flags;
 498
 499         smb_conn->statistics.last_request_time = cur_time;
 500
 501         /* see if its a special NBT packet */
 502         if (CVAL(blob.data,0) != 0) {
 503                 DEBUG(2,("Special NBT packet on SMB2 connection"));
 504                 smbsrv_terminate_connection(smb_conn, "Special NBT packet on SMB2 connection");
 505                 return NT_STATUS_OK;
 506         }
 507
 508         if (blob.length < (NBT_HDR_SIZE + SMB2_MIN_SIZE_NO_BODY)) {
 509                 DEBUG(2,("Invalid SMB2 packet length count %ld\n", (long)blob.length));
 510                 smbsrv_terminate_connection(smb_conn, "Invalid SMB2 packet");
 511                 return NT_STATUS_OK;
 512         }
 513
 514         protocol_version = IVAL(blob.data, NBT_HDR_SIZE);
 515         if (protocol_version != SMB2_MAGIC) {
 516                 DEBUG(2,("Invalid SMB packet: protocol prefix: 0x%08X\n",
 517                          protocol_version));
 518                 smbsrv_terminate_connection(smb_conn, "NON-SMB2 packet");
 519                 return NT_STATUS_OK;
 520         }
 521
 522         req = smb2srv_init_request(smb_conn);
 523         NT_STATUS_HAVE_NO_MEMORY(req);
 524
 525         req->in.buffer          = talloc_steal(req, blob.data);
 526         req->in.size            = blob.length;
 527         req->request_time       = cur_time;
 528         req->in.allocated       = req->in.size;
 529
 530         req->in.hdr             = req->in.buffer+ NBT_HDR_SIZE;
 531         req->in.body            = req->in.hdr   + SMB2_HDR_BODY;
 532         req->in.body_size       = req->in.size  - (SMB2_HDR_BODY+NBT_HDR_SIZE);
 533         req->in.dynamic         = NULL;
 534
 535         req->seqnum             = BVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID);
 536
 537         if (req->in.body_size < 2) {
 538                 /* error handling for this is different for negprot to
 539                    other packet types */
 540                 uint16_t opcode = SVAL(req->in.hdr, SMB2_HDR_OPCODE);
 541                 if (opcode == SMB2_OP_NEGPROT) {
 542                         smbsrv_terminate_connection(req->smb_conn, "Bad body size in SMB2 negprot");
 543                         return NT_STATUS_OK;
 544                 } else {
 545                         smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER);
 546                         return NT_STATUS_OK;
 547                 }
 548         }
 549
 550         buffer_code             = SVAL(req->in.body, 0);
 551         req->in.body_fixed      = (buffer_code & ~1);
 552         dynamic_size            = req->in.body_size - req->in.body_fixed;
 553
 554         if (dynamic_size != 0 && (buffer_code & 1)) {
 555                 req->in.dynamic = req->in.body + req->in.body_fixed;
 556                 if (smb2_oob(&req->in, req->in.dynamic, dynamic_size)) {
 557                         DEBUG(1,("SMB2 request invalid dynamic size 0x%x\n",
 558                                  dynamic_size));
 559                         smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER);
 560                         return NT_STATUS_OK;
 561                 }
 562         }
 563
 564         smb2srv_setup_bufinfo(req);
 565
 566         /*
 567          * TODO: - make sure the length field is 64
 568          *       - make sure it's a request
 569          */
 570
 571         flags = IVAL(req->in.hdr, SMB2_HDR_FLAGS);
 572         /* the first request should never have the related flag set */
 573         if (flags & SMB2_HDR_FLAG_CHAINED) {
 574                 req->chain_status = NT_STATUS_INVALID_PARAMETER;
 575         }
 576
 577         return smb2srv_reply(req);
 578 }
 579
 580 static NTSTATUS smb2srv_init_pending(struct smbsrv_connection *smb_conn)
 581 {
 582         smb_conn->requests2.idtree_req = idr_init(smb_conn);
 583         NT_STATUS_HAVE_NO_MEMORY(smb_conn->requests2.idtree_req);
 584         smb_conn->requests2.idtree_limit        = 0x00FFFFFF & (UINT32_MAX - 1);
 585         smb_conn->requests2.list                = NULL;
 586
 587         return NT_STATUS_OK;
 588 }
 589
 590 NTSTATUS smb2srv_queue_pending(struct smb2srv_request *req)
 591 {
 592         NTSTATUS status;
 593         bool signing_used = false;
 594         int id;
 595         uint16_t credits = SVAL(req->in.hdr, SMB2_HDR_CREDIT);
 596
 597         if (credits == 0) {
 598                 credits = 1;
 599         }
 600
 601         if (req->pending_id) {
 602                 return NT_STATUS_INTERNAL_ERROR;
 603         }
 604
 605         if (req->smb_conn->connection->event.fde == NULL) {
 606                 /* the socket has been destroyed - no point trying to send an error! */
 607                 return NT_STATUS_REMOTE_DISCONNECT;
 608         }
 609
 610         id = idr_get_new_above(req->smb_conn->requests2.idtree_req, req,
 611                                1, req->smb_conn->requests2.idtree_limit);
 612         if (id == -1) {
 613                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 614         }
 615
 616         DLIST_ADD_END(req->smb_conn->requests2.list, req, struct smb2srv_request *);
 617         req->pending_id = id;
 618
 619         talloc_set_destructor(req, smb2srv_request_deny_destructor);
 620
 621         status = smb2srv_setup_reply(req, 8, true, 0);
 622         if (!NT_STATUS_IS_OK(status)) {
 623                 return status;
 624         }
 625
 626         SIVAL(req->out.hdr, SMB2_HDR_STATUS, NT_STATUS_V(STATUS_PENDING));
 627         SSVAL(req->out.hdr, SMB2_HDR_CREDIT, credits);
 628
 629         SSVAL(req->out.body, 0x02, 0);
 630         SIVAL(req->out.body, 0x04, 0);
 631
 632         /* if the real reply will be signed set the signed flags, but don't sign */
 633         if (req->is_signed) {
 634                 SIVAL(req->out.hdr, SMB2_HDR_FLAGS, IVAL(req->out.hdr, SMB2_HDR_FLAGS) | SMB2_HDR_FLAG_SIGNED);
 635                 signing_used = req->is_signed;
 636                 req->is_signed = false;
 637         }
 638
 639         smb2srv_send_reply(req);
 640
 641         req->is_signed = signing_used;
 642
 643         talloc_set_destructor(req, smb2srv_request_destructor);
 644         return NT_STATUS_OK;
 645 }
 646
 647 void smb2srv_cancel_recv(struct smb2srv_request *req)
 648 {
 649         uint32_t pending_id;
 650         uint32_t flags;
 651         void *p;
 652         struct smb2srv_request *r;
 653
 654         if (!req->session) goto done;
 655
 656         flags           = IVAL(req->in.hdr, SMB2_HDR_FLAGS);
 657         pending_id      = IVAL(req->in.hdr, SMB2_HDR_PID);
 658
 659         if (!(flags & SMB2_HDR_FLAG_ASYNC)) {
 660                 /* TODO: what to do here? */
 661                 goto done;
 662         }
 663
 664         p = idr_find(req->smb_conn->requests2.idtree_req, pending_id);
 665         if (!p) goto done;
 666
 667         r = talloc_get_type(p, struct smb2srv_request);
 668         if (!r) goto done;
 669
 670         if (!r->ntvfs) goto done;
 671
 672         ntvfs_cancel(r->ntvfs);
 673
 674 done:
 675         /* we never generate a reply for a SMB2 Cancel */
 676         talloc_free(req);
 677 }
 678
 679 /*
 680  * init the SMB2 protocol related stuff
 681  */
 682 NTSTATUS smbsrv_init_smb2_connection(struct smbsrv_connection *smb_conn)
 683 {
 684         NTSTATUS status;
 685
 686         /* now initialise a few default values associated with this smb socket */
 687         smb_conn->negotiate.max_send = 0xFFFF;
 688
 689         /* this is the size that w2k uses, and it appears to be important for
 690            good performance */
 691         smb_conn->negotiate.max_recv = lpcfg_max_xmit(smb_conn->lp_ctx);
 692
 693         smb_conn->negotiate.zone_offset = get_time_zone(time(NULL));
 694
 695         smb_conn->config.nt_status_support = true;
 696
 697         status = smbsrv_init_sessions(smb_conn, UINT64_MAX);
 698         NT_STATUS_NOT_OK_RETURN(status);
 699
 700         status = smb2srv_init_pending(smb_conn);
 701         NT_STATUS_NOT_OK_RETURN(status);
 702
 703         return NT_STATUS_OK;
 704
 705 }