280 lines
9.1 KiB
C
280 lines
9.1 KiB
C
/* packet-fortinet-sso.c
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* Routines for Fortinet Single Sign-On
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* Copyright 2020, Alexis La Goutte <alexis.lagoutte at gmail dot com>
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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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* No spec/doc is available based on reverse/analysis of protocol...
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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/addr_resolv.h>
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#define UDP_FSSO 8002
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void proto_register_fortinet_sso(void);
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void proto_reg_handoff_fortinet_sso(void);
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static int proto_fortinet_sso = -1;
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static gint ett_fortinet_sso = -1;
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static int hf_fsso_length = -1;
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static int hf_fsso_timestamp = -1;
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static int hf_fsso_client_ip = -1;
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static int hf_fsso_payload_length = -1;
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static int hf_fsso_string = -1;
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static int hf_fsso_domain = -1;
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static int hf_fsso_user = -1;
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static int hf_fsso_host = -1;
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static int hf_fsso_version = -1;
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static int hf_fsso_tsagent_number_port_range = -1;
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static int hf_fsso_tsagent_port_range_min = -1;
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static int hf_fsso_tsagent_port_range_max = -1;
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static int hf_fsso_unknown = -1;
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static int hf_fsso_unknown_ipv4 = -1;
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static dissector_handle_t fortinet_sso_handle;
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static int
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dissect_fortinet_sso(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *ti;
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proto_tree *fsso_tree;
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guint32 payload_length, client_ip;
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gint string_length = -1;
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const gchar *string;
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gint32 len;
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int offset = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "FSSO");
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col_clear(pinfo->cinfo, COL_INFO);
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col_add_fstr(pinfo->cinfo, COL_INFO, "Fortinet Single Sign-On");
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ti = proto_tree_add_item(tree, proto_fortinet_sso, tvb, 0, -1, ENC_NA);
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fsso_tree = proto_item_add_subtree(ti, ett_fortinet_sso);
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proto_tree_add_item(fsso_tree, hf_fsso_length, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(fsso_tree, hf_fsso_timestamp, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(fsso_tree, hf_fsso_client_ip, tvb, offset, 4, ENC_BIG_ENDIAN);
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client_ip = tvb_get_ipv4(tvb, offset);
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offset += 4;
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proto_tree_add_item_ret_uint(fsso_tree, hf_fsso_payload_length, tvb, offset, 2, ENC_BIG_ENDIAN, &payload_length);
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offset += 2;
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string = tvb_get_stringz_enc(pinfo->pool, tvb, offset, &string_length, ENC_ASCII);
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proto_tree_add_item(fsso_tree, hf_fsso_string, tvb, offset, string_length, ENC_ASCII|ENC_NA);
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col_set_str(pinfo->cinfo, COL_INFO, string);
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if(client_ip == 0xFFFFFFFF) { //if client_ip equal 255.255.255.255 (0xFFFFFFFF) is KeepAlive packet
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/* Domain / KeepAlive (User) / Version */
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len = tvb_find_guint8(tvb, offset, string_length, '/') - offset;
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proto_tree_add_item(fsso_tree, hf_fsso_domain, tvb, offset, len, ENC_ASCII|ENC_NA);
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offset += (len + 1);
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string_length -= (len + 1);
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len = tvb_find_guint8(tvb, offset, string_length, '/') - offset;
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proto_tree_add_item(fsso_tree, hf_fsso_user, tvb, offset, len, ENC_ASCII|ENC_NA);
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offset += (len + 1);
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string_length -= (len + 1);
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proto_tree_add_item(fsso_tree, hf_fsso_version, tvb, offset, string_length, ENC_ASCII|ENC_NA);
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offset += (string_length);
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} else {
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/* Host / Domain / User */
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len = tvb_find_guint8(tvb, offset, string_length, '/') - offset;
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proto_tree_add_item(fsso_tree, hf_fsso_host, tvb, offset, len, ENC_ASCII|ENC_NA);
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offset += (len + 1);
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string_length -= (len + 1);
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len = tvb_find_guint8(tvb, offset, string_length, '/') - offset;
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proto_tree_add_item(fsso_tree, hf_fsso_domain, tvb, offset, len, ENC_ASCII|ENC_NA);
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offset += (len + 1);
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string_length -= (len + 1);
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proto_tree_add_item(fsso_tree, hf_fsso_user, tvb, offset, string_length, ENC_ASCII|ENC_NA);
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offset += (string_length);
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}
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if(tvb_reported_length_remaining(tvb, offset)) {
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guint16 value;
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guint32 number_port_range;
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value = tvb_get_ntohs(tvb, offset);
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if(value == 0x2002) { /* Not a TS Agent additionnal Data */
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proto_tree_add_item(fsso_tree, hf_fsso_unknown, tvb, offset, 2, ENC_NA);
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offset += 2;
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proto_tree_add_item(fsso_tree, hf_fsso_unknown_ipv4, tvb, offset, 4, ENC_NA);
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offset += 4;
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proto_tree_add_item(fsso_tree, hf_fsso_unknown, tvb, offset, 6, ENC_NA);
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offset += 6;
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proto_tree_add_item(fsso_tree, hf_fsso_unknown_ipv4, tvb, offset, 4, ENC_NA);
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offset += 4;
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proto_tree_add_item(fsso_tree, hf_fsso_unknown, tvb, offset, 1, ENC_NA);
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offset += 1;
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} else {
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proto_tree_add_item(fsso_tree, hf_fsso_unknown, tvb, offset, 15, ENC_NA);
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offset += 15;
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proto_tree_add_item(fsso_tree, hf_fsso_unknown, tvb, offset, 5, ENC_NA);
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offset += 5;
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proto_tree_add_item(fsso_tree, hf_fsso_unknown, tvb, offset, 6, ENC_NA);
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offset += 6;
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/* Port Range assigned to user for TS Agent (RDP/Citrix) */
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proto_tree_add_item_ret_uint(fsso_tree, hf_fsso_tsagent_number_port_range, tvb, offset, 2, ENC_BIG_ENDIAN, &number_port_range);
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offset += 2;
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while (number_port_range) {
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proto_tree_add_item(fsso_tree, hf_fsso_tsagent_port_range_min, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(fsso_tree, hf_fsso_tsagent_port_range_max, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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number_port_range --;
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}
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}
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}
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return offset;
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}
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static gboolean
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dissect_fortinet_fsso_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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{
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guint32 length_remaining, length;
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if (tvb_captured_length(tvb) < 2) {
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return FALSE;
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}
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length_remaining = tvb_reported_length_remaining(tvb, 0);
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//first bytes is the length of payload
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length = tvb_get_ntohs(tvb, 0);
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if(length_remaining != length)
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{
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return FALSE;
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}
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//always send with UDP Destination Port 80002
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if(pinfo->destport != UDP_FSSO)
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{
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return FALSE;
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}
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dissect_fortinet_sso(tvb, pinfo, tree, data);
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return TRUE;
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}
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void
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proto_register_fortinet_sso(void)
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{
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static hf_register_info hf[] = {
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{ &hf_fsso_length,
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{ "Length", "fortinet_sso.length", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_timestamp,
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{ "Timestamp", "fortinet_sso.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_client_ip,
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{ "Client IP", "fortinet_sso.client_ip", FT_IPv4, BASE_NONE, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_payload_length,
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{ "Payload Length", "fortinet_sso.payload_length", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_string,
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{ "String", "fortinet_sso.string", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_user,
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{ "User", "fortinet_sso.user", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_domain,
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{ "Domain", "fortinet_sso.domain", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_host,
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{ "Host", "fortinet_sso.host", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_version,
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{ "Version", "fortinet_sso.version", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_tsagent_number_port_range,
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{ "Number of Port Range", "fortinet_sso.tsagent.port_range.number", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_tsagent_port_range_min,
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{ "Port Range (Min)", "fortinet_sso.tsagent.port_range.min", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_tsagent_port_range_max,
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{ "Port Range (Max)", "fortinet_sso.tsagent.port_range.max", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL}},
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{ &hf_fsso_unknown,
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{ "Unknown", "fortinet_sso.unknown", FT_BYTES, BASE_NONE, NULL, 0x0,
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"Unknown Data...", HFILL}},
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{ &hf_fsso_unknown_ipv4,
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{ "Unknown IPv4", "fortinet_sso.unknown.ipv4", FT_IPv4, BASE_NONE, NULL, 0x0,
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"Unknown Data...", HFILL}},
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};
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static gint *ett[] = {
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&ett_fortinet_sso,
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};
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proto_fortinet_sso = proto_register_protocol("Fortinet Single Sign On", "fortinet_sso", "fortinet_sso");
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fortinet_sso_handle = register_dissector("fortinet_sso", dissect_fortinet_sso, proto_fortinet_sso);
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proto_register_field_array(proto_fortinet_sso, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_fortinet_sso(void)
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{
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dissector_add_uint_with_preference("udp.port", 0, fortinet_sso_handle);
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heur_dissector_add("udp", dissect_fortinet_fsso_heur, "fortinet_sso", "fortinet_sso", proto_fortinet_sso, HEURISTIC_ENABLE);
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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: 4
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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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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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