-- Copyright (C) 2009 Thilo Cestonaro -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- --[[ * to restart the proxy in the console: e.g. module:unload("proxy65"); > server.removeserver(<proxy65_port>); module:load("proxy65", <proxy65_jid>); ]]-- 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, jid_join = require "util.jid".split, require "util.jid".join; local st = require "util.stanza"; local componentmanager = require "core.componentmanager"; local config_get = require "core.configmanager".get; local connlisteners = require "net.connlisteners"; local sha1 = require "util.hashes".sha1; local server = require "net.server"; 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 host; local proxy_acl = config_get(host, "core", "proxy65_acl"); local max_buffer_size = 4096; local connlistener = { default_port = proxy_port, default_interface = proxy_interface, default_mode = "*a" }; function connlistener.onincoming(conn, data) local session = sessions[conn] or {}; if session.setup == nil 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].target ~= nil then if transfers[sha].initiator == conn then transfers[sha].target:write(data); else transfers[sha].initiator:write(data); end 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 40 (0x28) 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 ... "); server.link(conn, transfers[sha].target, max_buffer_size); server.link(transfers[sha].target, conn, max_buffer_size); 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) conn:lock_read(true) else module:log("warn", "Neither data transfer nor initial connect of a participator of a transfer.") conn:close(); end else if data ~= nil then module:log("warn", "unknown connection with no authentication data -> closing it"); conn:close(); end end end function connlistener.ondisconnect(conn, err) local session = sessions[conn]; if session then if session.sha and transfers[session.sha] then local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target; if initiator == conn and target ~= nil then target:close(); elseif target == conn and initiator ~= nil then initiator:close(); end transfers[session.sha] = nil; end -- 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_items = reply; end reply.attr.id = stanza.attr.id; reply.attr.to = stanza.attr.from; return reply; end local function get_stream_host(origin, stanza) local reply = replies_cache.stream_host; local err_reply = replies_cache.stream_host_err; local sid = stanza.tags[1].attr.sid; local allow = false; local jid_node, jid_host, jid_resource = jid_split(stanza.attr.from); if stanza.attr.from == nil then jid_node = origin.username; jid_host = origin.host; jid_resource = origin.resource; end if proxy_acl and #proxy_acl > 0 then if host ~= nil then -- at least a domain is needed. for _, acl in ipairs(proxy_acl) do local acl_node, acl_host, acl_resource = jid_split(acl); if ((acl_node ~= nil and acl_node == jid_node) or acl_node == nil) and ((acl_host ~= nil and acl_host == jid_host) or acl_host == nil) and ((acl_resource ~= nil and acl_resource == jid_resource) or acl_resource == nil) then allow = true; end end end else allow = true; end if allow == true then 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}); replies_cache.stream_host = reply; end else module:log("warn", "Denying use of proxy for %s", tostring(jid_join(jid_node, jid_host, jid_resource))); if err_reply == nil then err_reply = st.iq({type="error", from=host}) :query("http://jabber.org/protocol/bytestreams") :tag("error", {code='403', type='auth'}) :tag("forbidden", {xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'}); replies_cache.stream_host_err = err_reply; end reply = err_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(module.host .. ':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, to=from}); 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(origin, stanza)); return true; else origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); return true; end elseif stanza.name == "iq" and type == "set" then module:log("debug", "Received activation request from %s", stanza.attr.from); 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; transfers[sha].target:lock_read(false); transfers[sha].initiator:lock_read(false); else module:log("debug", "Both parties were not yet connected"); local message = "Neither party is connected to the proxy"; if transfers[sha].initiator then message = "The recipient is not connected to the proxy"; elseif transfers[sha].target then message = "The sender (you) is not connected to the proxy"; end origin.send(st.error_reply(stanza, "cancel", "not-allowed", message)); end else module:log("error", "activation failed: sid: %s, initiator: %s, target: %s", tostring(sid), tostring(from), tostring(to)); end end end return; end if not connlisteners.register(module.host .. ':proxy65', connlistener) then module:log("error", "mod_proxy65: Could not establish a connection listener. Check your configuration please."); module:log("error", "Possibly two proxy65 components are configured to share the same port."); end connlisteners.start(module.host .. ':proxy65'); component = componentmanager.register_component(host, handle_to_domain);