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-- 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>);
]]--
local jid_split, jid_join, jid_compare = require "util.jid".split, require "util.jid".join, require "util.jid".compare;
local st = require "util.stanza";
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, replies_cache = {}, {}, {};
local proxy_port = module:get_option("proxy65_port") or 5000;
local proxy_interface = module:get_option("proxy65_interface") or "*";
local proxy_address = module:get_option("proxy65_address") or (proxy_interface ~= "*" and proxy_interface) or host;
local proxy_acl = module:get_option("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
module:hook("iq-get/host/http://jabber.org/protocol/disco#info:query", function(event)
local origin, stanza = event.origin, event.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;
origin.send(reply);
return true;
end, -1);
module:hook("iq-get/host/http://jabber.org/protocol/disco#items:query", function(event)
local origin, stanza = event.origin, event.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;
origin.send(reply);
return true;
end, -1);
module:hook("iq-get/host/http://jabber.org/protocol/bytestreams:query", function(event)
local origin, stanza = event.origin, event.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 = stanza.attr.from;
if proxy_acl and #proxy_acl > 0 then
for _, acl in ipairs(proxy_acl) do
if jid_compare(jid, acl) then allow = true; 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));
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;
origin.send(reply);
return true;
end);
module.unload = function()
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
module:hook("iq-set/host/http://jabber.org/protocol/bytestreams:query", function(event)
local origin, stanza = event.origin, event.stanza;
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
return true;
else
module:log("error", "activation failed: sid: %s, initiator: %s, target: %s", tostring(sid), tostring(from), tostring(to));
end
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');
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