From ccc5a207100831df07c2dc9733837e731de86938 Mon Sep 17 00:00:00 2001 From: Ivan Nardi <12729895+IvanNardi@users.noreply.github.com> Date: Tue, 17 Jan 2023 21:55:38 +0100 Subject: Add detection of Tailscale (#1857) Extend the example of wireguard traffic --- src/lib/protocols/tailscale.c | 59 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 src/lib/protocols/tailscale.c (limited to 'src/lib/protocols') diff --git a/src/lib/protocols/tailscale.c b/src/lib/protocols/tailscale.c new file mode 100644 index 000000000..ac6669ccc --- /dev/null +++ b/src/lib/protocols/tailscale.c @@ -0,0 +1,59 @@ +/* + * tailscale.c + * + * Copyright (C) 2022 - ntop.org + * + * nDPI is free software: you can zmqtribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * nDPI is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with nDPI. If not, see . + * + */ +#include "ndpi_protocol_ids.h" + +#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_TAILSCALE + +#include "ndpi_api.h" + +/* https://github.com/tailscale/tailscale/blob/main/disco/disco.go + * https://tailscale.com/kb/1082/firewall-ports/ + */ + +static void ndpi_search_tailscale(struct ndpi_detection_module_struct *ndpi_struct, + struct ndpi_flow_struct *flow) +{ + struct ndpi_packet_struct *packet = &ndpi_struct->packet; + unsigned char magic[6] = { 0x54, 0x53, 0xf0, 0x9f, 0x92, 0xac }; + unsigned short port = 41641; + + NDPI_LOG_DBG(ndpi_struct, "search Tailscale\n"); + + if(packet->payload_packet_len > sizeof(magic) && + (ntohs(flow->c_port) == port || ntohs(flow->s_port) == port) && + memcmp(packet->payload, magic, sizeof(magic)) == 0) { + NDPI_LOG_INFO(ndpi_struct, "found Tailscale\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_TAILSCALE, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI); + return; + } + + NDPI_EXCLUDE_PROTO(ndpi_struct, flow); +} + +void init_tailscale_dissector(struct ndpi_detection_module_struct *ndpi_struct, + u_int32_t *id) { + ndpi_set_bitmask_protocol_detection("Tailscale", ndpi_struct, *id, + NDPI_PROTOCOL_TAILSCALE, + ndpi_search_tailscale, + NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD, + SAVE_DETECTION_BITMASK_AS_UNKNOWN, + ADD_TO_DETECTION_BITMASK); + *id += 1; +} -- cgit v1.2.3