From 0d47952611198ef6b1163f366dc03922d20b1475 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 09:42:04 +0200 Subject: Adding upstream version 7.94+git20230807.3be01efb1+dfsg. Signed-off-by: Daniel Baumann --- scripts/tor-consensus-checker.nse | 135 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 135 insertions(+) create mode 100644 scripts/tor-consensus-checker.nse (limited to 'scripts/tor-consensus-checker.nse') diff --git a/scripts/tor-consensus-checker.nse b/scripts/tor-consensus-checker.nse new file mode 100644 index 0000000..e8f5737 --- /dev/null +++ b/scripts/tor-consensus-checker.nse @@ -0,0 +1,135 @@ +local http = require "http" +local ipOps = require "ipOps" +local stdnse = require "stdnse" +local string = require "string" +local nmap = require "nmap" + +description = [[ +Checks if a target is a known Tor node. + +The script works by querying the Tor directory authorities. Initially, +the script stores all IPs of Tor nodes in a lookup table to reduce the +number of requests and make lookups quicker. +]] + +--- +-- @usage +-- nmap --script=tor-consensus-checker +-- +-- @output +-- Host script results: +-- | tor-consensus-checker: +-- |_ 127.0.0.1 is a Tor node +--- + +author = "Jiayi Ye" +license = "Same as Nmap--See https://nmap.org/book/man-legal.html" +categories = {"external", "safe"} + +-- from Tor 0.2.9 auth_dirs.inc +local dir_authorities = { + { ip = "128.31.0.39", port = 9131}, + { ip = "86.59.21.38", port = 80 }, + { ip = "45.66.33.45", port = 80 }, + { ip = "66.111.2.131", port = 9030 }, + { ip = "131.188.40.189", port = 80 }, + { ip = "193.23.244.244", port = 80 }, + { ip = "171.25.193.9", port = 443 }, + { ip = "154.35.175.225", port = 80 }, + { ip = "199.58.81.140", port = 80 }, + { ip = "204.13.164.118", port = 80 }, +} + +hostrule = function(host) + if nmap.registry.tornode and not(nmap.registry.tornode.connect) then + return false + end + return not ipOps.isPrivate(host.ip) +end + +function get_consensus(server) + local response = http.get(server.ip, server.port, "/tor/status-vote/current/consensus", + { + -- consensus files were 2.3 MiB as of February 2020 + -- https://metrics.torproject.org/collector/recent/relay-descriptors/consensuses/ + no_cache = true, + max_body_size=3*1024*1024 + }) + + if not response.status then + stdnse.print_debug(2, "failed to connect to " .. server.ip) + elseif response.status ~= 200 then + stdnse.print_debug(2, "%s http error %s", server.ip, response.status) + else + stdnse.print_debug(2, "consensus retrieved from %s", server.ip) + return response.body + end + + -- no valid server found + return nil +end + +function script_init() + -- Data and flags shared between threads. + -- @name tornode + -- @class table + -- @field cache A table for cached tor nodes + -- @field connect A flag which prevents threads from looking up when failed to connnect to directory authorities + nmap.registry.tornode = {} + nmap.registry.tornode.cache = {} + + local isConnected = false + local regexp = "r [%S]+ [%S]+ [%S]+ [%d-]+ [%d:]+ ([%d.]+) ([%d]+) [%d]*" + for _, server in ipairs(dir_authorities) do + local consensus = get_consensus(server) + if consensus then + -- parse the consensus + for line in string.gmatch(consensus,"[^\n]+") do + local _, _, ip, port = string.find(line,regexp) + if ip then + isConnected = true + nmap.registry.tornode.cache[ip] = true + end + end + end + if isConnected then + break + end + end + if not(isConnected) then + stdnse.verbose1("failed to connect to directory authorities") + end + nmap.registry.tornode.connect = isConnected +end + +function check_tornode_cache(ip) + if not next( nmap.registry.tornode.cache ) then return false end + if type( ip ) ~= "string" or ip == "" then return false end + return nmap.registry.tornode.cache[ip] +end + +action = function(host) + local mutex = nmap.mutex("tornode") + mutex "lock" + --initialize nmap.registry.tornode + if not nmap.registry.tornode then + script_init() + end + mutex "done" + + if not(nmap.registry.tornode.connect) then + if nmap.verbosity() > 2 then + return "Couln't connect to Tor dir authorities" + else + return nil + end + end + + local output_tab = stdnse.output_table() + if check_tornode_cache(host.ip) then + output_tab.tor_nodes = host.ip + return output_tab, host.ip .. " is a Tor node" + else + return output_tab, host.ip .. " not found in Tor consensus" + end +end -- cgit v1.2.3