-- Copyright (C) 2009 Thilo Cestonaro -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- if module:get_host_type() ~= "component" then error("proxy65 should be loaded as a component, please see http://prosody.im/doc/components", 0); end local jid_split = require "util.jid".split; local st = require "util.stanza"; local componentmanager = require "core.componentmanager"; local config_get = require "core.configmanager".get; local connlisteners = require "net.connlisteners"; local adns, dns = require "net.adns", require "net.dns"; local add_task = require "util.timer".add_task; local max_dns_depth = config.get("*", "core", "dns_max_depth") or 3; local dns_timeout = config.get("*", "core", "dns_timeout") or 60; local sha1 = require "util.hashes".sha1; local host, name = module:get_host(), "SOCKS5 Bytestreams Service"; local sessions, transfers, component, replies_cache = {}, {}, nil, {}; local proxy_port = config_get(host, "core", "proxy65_port") or 5000; local proxy_interface = config_get(host, "core", "proxy65_interface") or "*"; local proxy_address = config_get(host, "core", "proxy65_address") or (proxy_interface ~= "*" and proxy_interface) or module.host; local connlistener = { default_port = proxy_port, default_interface = proxy_interface, default_mode = "*a" }; function connlistener.listener(conn, data) local session = sessions[conn] or {}; if session.setup == false and data ~= nil and data:sub(1):byte() == 0x05 and data:len() > 2 then local nmethods = data:sub(2):byte(); local methods = data:sub(3); local supported = false; for i=1, nmethods, 1 do if(methods:sub(i):byte() == 0x00) then -- 0x00 == method: NO AUTH supported = true; break; end end if(supported) then module:log("debug", "new session found ... ") session.setup = true; sessions[conn] = session; conn.write(string.char(5, 0)); end return; end if session.setup then if session.sha ~= nil and transfers[session.sha] ~= nil then local sha = session.sha; if transfers[sha].activated == true and transfers[sha].initiator == conn and transfers[sha].target ~= nil then transfers[sha].target.write(data); return; end end if data ~= nil and data:len() == 0x2F and -- 40 == length of SHA1 HASH, and 7 other bytes => 47 => 0x2F data:sub(1):byte() == 0x05 and -- SOCKS5 has 5 in first byte data:sub(2):byte() == 0x01 and -- CMD must be 1 data:sub(3):byte() == 0x00 and -- RSV must be 0 data:sub(4):byte() == 0x03 and -- ATYP must be 3 data:sub(5):byte() == 40 and -- SHA1 HASH length must be 64 (0x40) data:sub(-2):byte() == 0x00 and -- PORT must be 0, size 2 byte data:sub(-1):byte() == 0x00 then local sha = data:sub(6, 45); -- second param is not count! it's the ending index (included!) if transfers[sha] == nil then transfers[sha] = {}; transfers[sha].activated = false; transfers[sha].target = conn; session.sha = sha; module:log("debug", "target connected ... "); elseif transfers[sha].target ~= nil then transfers[sha].initiator = conn; session.sha = sha; module:log("debug", "initiator connected ... "); end conn.write(string.char(5, 0, 0, 3, sha:len()) .. sha .. string.char(0, 0)); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte) end end end function connlistener.disconnect(conn, err) if sessions[conn] then -- Clean up any session-related stuff here sessions[conn] = nil; end end local function get_disco_info(stanza) local reply = replies_cache.disco_info; if reply == nil then reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#info") :tag("identity", {category='proxy', type='bytestreams', name=name}):up() :tag("feature", {var="http://jabber.org/protocol/bytestreams"}); replies_cache.disco_info = reply; end reply.attr.id = stanza.attr.id; reply.attr.to = stanza.attr.from; return reply; end local function get_disco_items(stanza) local reply = replies_cache.disco_items; if reply == nil then reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#items"); replies_cache.disco_info = reply; end reply.attr.id = stanza.attr.id; reply.attr.to = stanza.attr.from; return reply; end local function get_stream_host(stanza) local reply = replies_cache.stream_host; local sid = stanza.tags[1].attr.sid; if reply == nil then reply = st.iq({type="result", from=host}) :query("http://jabber.org/protocol/bytestreams") :tag("streamhost", {jid=host, host=proxy_address, port=proxy_port}); -- TODO get the correct data replies_cache.stream_host = reply; end reply.attr.id = stanza.attr.id; reply.attr.to = stanza.attr.from; reply.tags[1].attr.sid = sid; return reply; end module.unload = function() componentmanager.deregister_component(host); connlisteners.deregister("proxy65"); end local function set_activation(stanza) local from, to, sid, reply = nil; from = stanza.attr.from; if stanza.tags[1] ~= nil and tostring(stanza.tags[1].name) == "query" then if stanza.tags[1].attr ~= nil then sid = stanza.tags[1].attr.sid; end if stanza.tags[1].tags[1] ~= nil and tostring(stanza.tags[1].tags[1].name) == "activate" then to = stanza.tags[1].tags[1][1]; end end if from ~= nil and to ~= nil and sid ~= nil then reply = st.iq({type="result", from=host}); reply.attr.id = stanza.attr.id; end return reply, from, to, sid; end function handle_to_domain(origin, stanza) local to_node, to_host, to_resource = jid_split(stanza.attr.to); if to_node == nil then local type = stanza.attr.type; if type == "error" or type == "result" then return; end if stanza.name == "iq" and type == "get" then local xmlns = stanza.tags[1].attr.xmlns if xmlns == "http://jabber.org/protocol/disco#info" then origin.send(get_disco_info(stanza)); return true; elseif xmlns == "http://jabber.org/protocol/disco#items" then origin.send(get_disco_items(stanza)); return true; elseif xmlns == "http://jabber.org/protocol/bytestreams" then origin.send(get_stream_host(stanza)); return true; end elseif stanza.name == "iq" and type == "set" then local reply, from, to, sid = set_activation(stanza); if reply ~= nil and from ~= nil and to ~= nil and sid ~= nil then local sha = sha1(sid .. from .. to, true); if transfers[sha] == nil then module:log("error", "transfers[sha]: nil"); elseif(transfers[sha] ~= nil and transfers[sha].initiator ~= nil and transfers[sha].target ~= nil) then origin.send(reply); transfers[sha].activated = true; end end end end return; end if not connlisteners.register(module.host .. ':proxy65', connlistener) then error("mod_proxy65: Could not establish a connection listener. Check your configuration please."); error(" one possible cause for this would be that two proxy65 components share the same port."); end connlisteners.start('proxy65'); component = componentmanager.register_component(host, handle_to_domain);