forked from osmocom/wireshark
259 lines
7.4 KiB
C
259 lines
7.4 KiB
C
/* packet-rdpudp.c
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* Routines for RDP multi transport packet dissection
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* Copyright 2021, David Fort
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/conversation.h>
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#include "packet-rdp.h"
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#include "packet-rdpudp.h"
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#define PNAME "Remote Desktop Protocol Multi-transport"
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#define PSNAME "RDPMT"
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#define PFNAME "rdpmt"
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void proto_register_rdpmt(void);
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void proto_reg_handoff_rdpmt(void);
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static dissector_handle_t rdpmt_handle;
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static int proto_rdpmt = -1;
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static int pf_mt_action = -1;
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static int pf_mt_flags = -1;
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static int pf_mt_payload_len = -1;
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static int pf_mt_header_len = -1;
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static int pf_mt_subheader_len = -1;
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static int pf_mt_subheader_type = -1;
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static int pf_mt_createreq_reqId = -1;
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static int pf_mt_createreq_reserved = -1;
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static int pf_mt_createreq_cookie = -1;
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static int pf_mt_createresp_hrResponse = -1;
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static int ett_rdpmt = -1;
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static int ett_rdpudp_subheaders = -1;
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static int ett_rdpmt_create_req = -1;
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static int ett_rdpmt_create_resp = -1;
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static int ett_rdpmt_data = -1;
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static dissector_handle_t drdynvcDissector;
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static const value_string rdpmt_action_vals[] = {
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{ 0x00, "CreateRequest"},
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{ 0x01, "CreateResponse"},
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{ 0x02, "Data"},
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{ 0x00, NULL}
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};
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static const value_string rdpmt_subheader_type_vals[] = {
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{ 0x0, "auto detect request" },
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{ 0x1, "auto detect response" },
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{ 0x0, NULL}
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};
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enum {
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RDPMT_TUNNEL_CREATE_REQ = 0,
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RDPMT_TUNNEL_CREATE_RESP = 1,
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RDPMT_TUNNEL_DATA = 2,
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};
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static int
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dissect_rdpmt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_)
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{
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proto_item *item;
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proto_tree *tree, *subtree;
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guint8 action, subheader_len;
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guint16 payload_len;
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int offset = 0;
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item = proto_tree_add_item(parent_tree, proto_rdpmt, tvb, 0, -1, ENC_NA);
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tree = proto_item_add_subtree(item, ett_rdpmt);
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action = tvb_get_guint8(tvb, offset) & 0x0f;
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proto_tree_add_item(tree, pf_mt_action, tvb, offset, 1, ENC_NA);
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proto_tree_add_item(tree, pf_mt_flags, tvb, offset, 1, ENC_NA);
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offset++;
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payload_len = tvb_get_guint16(tvb, offset, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(tree, pf_mt_payload_len, tvb, offset, 2, ENC_LITTLE_ENDIAN);
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offset += 2;
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subheader_len = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, pf_mt_header_len, tvb, offset, 1, ENC_NA);
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offset += 1;
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if (subheader_len > 4) {
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tvbuff_t *subheaders = tvb_new_subset_length(tvb, offset, subheader_len-4);
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proto_tree *subheaders_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rdpudp_subheaders, NULL, "SubHeaders");
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dissect_rdp_bandwidth_req(subheaders, 0, pinfo, subheaders_tree, !!rdp_isServerAddressTarget(pinfo));
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}
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offset += subheader_len - 4;
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switch (action) {
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case RDPMT_TUNNEL_CREATE_REQ: {
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guint8 cookie[16];
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guint32 reqId;
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conversation_t *conv = find_or_create_conversation(pinfo);
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col_set_str(pinfo->cinfo, COL_INFO, "TunnelCreateRequest");
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subtree = proto_tree_add_subtree(tree, tvb, offset, payload_len, ett_rdpmt_create_req, NULL, "TunnelCreateRequest");
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proto_tree_add_item(subtree, pf_mt_createreq_reqId, tvb, offset, 4, ENC_LITTLE_ENDIAN);
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reqId = tvb_get_guint32(tvb, offset, ENC_LITTLE_ENDIAN);
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offset += 4;
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proto_tree_add_item(subtree, pf_mt_createreq_reserved, tvb, offset, 4, ENC_LITTLE_ENDIAN);
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offset += 4;
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proto_tree_add_item(subtree, pf_mt_createreq_cookie, tvb, offset, 16, ENC_NA);
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tvb_memcpy(tvb, cookie, offset, 16);
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offset += 4;
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rdp_transport_set_udp_conversation(&pinfo->dst, pinfo->destport, rdpudp_is_reliable_transport(pinfo), reqId, cookie, conv);
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break;
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}
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case RDPMT_TUNNEL_CREATE_RESP:
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col_set_str(pinfo->cinfo, COL_INFO, "TunnelCreateResponse");
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subtree = proto_tree_add_subtree(tree, tvb, offset, payload_len, ett_rdpmt_create_resp, NULL, "TunnelCreateResponse");
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proto_tree_add_item(subtree, pf_mt_createresp_hrResponse, tvb, offset, 4, ENC_LITTLE_ENDIAN);
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break;
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case RDPMT_TUNNEL_DATA:
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if (payload_len) {
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tvbuff_t *payload = tvb_new_subset_length(tvb, offset, payload_len);
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subtree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_rdpmt_data, NULL, "Data");
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call_dissector(drdynvcDissector, payload, pinfo, subtree);
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}
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break;
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}
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return offset;
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}
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void
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proto_register_rdpmt(void) {
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/* List of fields */
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static hf_register_info hf[] = {
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{ &pf_mt_action,
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{"Action", "rdpmt.action", FT_UINT8, BASE_HEX, VALS(rdpmt_action_vals), 0x0F, NULL, HFILL}
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},
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{&pf_mt_flags,
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{"Flags", "rdpmt.flags", FT_UINT8, BASE_HEX, NULL, 0xF0, NULL, HFILL}
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},
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{&pf_mt_payload_len,
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{"Payload length", "rdpmt.payloadlen", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL}
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},
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{&pf_mt_header_len,
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{"Header length", "rdpmt.headerlen", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL}
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},
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{&pf_mt_subheader_len,
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{"Sub header length", "rdpmt.subheaderlen", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL}
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},
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{&pf_mt_subheader_type,
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{"Sub header type", "rdpmt.subheadertype", FT_UINT8, BASE_HEX, VALS(rdpmt_subheader_type_vals), 0, NULL, HFILL}
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},
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{&pf_mt_createreq_reqId,
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{"RequestID", "rdpmt.createrequest.requestid", FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL}
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},
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{&pf_mt_createreq_reserved,
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{"Reserved", "rdpmt.createrequest.reserved", FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL}
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},
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{&pf_mt_createreq_cookie,
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{"Security cookie", "rdpmt.createrequest.cookie", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL}
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},
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{&pf_mt_createresp_hrResponse,
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{"hrResponse", "rdpmt.createresponse.hrresponse", FT_INT32, BASE_DEC, NULL, 0, NULL, HFILL}
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}
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};
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/* List of subtrees */
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static gint *ett[] = {
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&ett_rdpmt,
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&ett_rdpudp_subheaders,
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&ett_rdpmt_create_req,
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&ett_rdpmt_create_resp,
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&ett_rdpmt_data
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};
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/* Register protocol */
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proto_rdpmt = proto_register_protocol(PNAME, PSNAME, PFNAME);
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/* Register fields and subtrees */
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proto_register_field_array(proto_rdpmt, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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rdpmt_handle = register_dissector("rdpmt", dissect_rdpmt, proto_rdpmt);
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}
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static gboolean
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rdpmt_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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{
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guint8 action, header_len;
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guint16 payload_len;
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if (tvb_reported_length(tvb) <= 4)
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return FALSE;
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action = tvb_get_guint8(tvb, 0);
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if (action > 2)
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return FALSE;
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payload_len = tvb_get_guint16(tvb, 1, ENC_LITTLE_ENDIAN);
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header_len = tvb_get_guint8(tvb, 3);
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if ((header_len < 4UL) || (tvb_reported_length_remaining(tvb, header_len) < payload_len))
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return FALSE;
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if (header_len > 4) {
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guint8 subheader_len, subheader_type;
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if(header_len < 6)
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return FALSE;
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subheader_len = tvb_get_guint8(tvb, 4);
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if ((subheader_len < 2) || (subheader_len > header_len-4))
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return FALSE;
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subheader_type = tvb_get_guint8(tvb, 5);
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if (subheader_type > 1) /* AUTODETECT_REQUEST or AUTODETECT_RESPONSE */
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return FALSE;
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}
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return dissect_rdpmt(tvb, pinfo, tree, data) > 0;
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}
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void
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proto_reg_handoff_rdpmt(void)
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{
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drdynvcDissector = find_dissector("rdp_drdynvc");
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heur_dissector_add("tls", rdpmt_heur, "RDP MultiTransport", "rdpmt_tls_", proto_rdpmt, TRUE);
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heur_dissector_add("dtls", rdpmt_heur, "RDP MultiTransport", "rdpmt_dtls", proto_rdpmt, TRUE);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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