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-- Prosody IM
-- Copyright (C) 2008-2011 Matthew Wild
-- Copyright (C) 2008-2011 Waqas Hussain
-- Copyright (C) 2009 Thilo Cestonaro
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
module:set_global();
local jid_compare, jid_prep = require "util.jid".compare, require "util.jid".prep;
local st = require "util.stanza";
local sha1 = require "util.hashes".sha1;
local b64 = require "util.encodings".base64.encode;
local server = require "net.server";
local sessions, transfers = module:shared("sessions", "transfers");
local max_buffer_size = 4096;
local listener = {};
function listener.onincoming(conn, data)
local session = sessions[conn] or {};
local transfer = transfers[session.sha];
if transfer and transfer.activated then -- copy data between initiator and target
local initiator, target = transfer.initiator, transfer.target;
(conn == initiator and target or initiator):write(data);
return;
end -- FIXME server.link should be doing this?
if not session.greeting_done then
local nmethods = data:byte(2) or 0;
if data:byte(1) == 0x05 and nmethods > 0 and #data == 2 + nmethods then -- check if we have all the data
if data:find("%z") then -- 0x00 = 'No authentication' is supported
session.greeting_done = true;
sessions[conn] = session;
conn:write("\5\0"); -- send (SOCKS version 5, No authentication)
module:log("debug", "SOCKS5 greeting complete");
return;
end
end -- else error, unexpected input
conn:write("\5\255"); -- send (SOCKS version 5, no acceptable method)
conn:close();
module:log("debug", "Invalid SOCKS5 greeting recieved: '%s'", b64(data));
else -- connection request
--local head = string.char( 0x05, 0x01, 0x00, 0x03, 40 ); -- ( VER=5=SOCKS5, CMD=1=CONNECT, RSV=0=RESERVED, ATYP=3=DOMAIMNAME, SHA-1 size )
if #data == 47 and data:sub(1,5) == "\5\1\0\3\40" and data:sub(-2) == "\0\0" then
local sha = data:sub(6, 45);
conn:pause();
conn:write("\5\0\0\3\40" .. sha .. "\0\0"); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
if not transfers[sha] then
transfers[sha] = {};
transfers[sha].target = conn;
session.sha = sha;
module:log("debug", "SOCKS5 target connected for session %s", sha);
else -- transfers[sha].target ~= nil
transfers[sha].initiator = conn;
session.sha = sha;
module:log("debug", "SOCKS5 initiator connected for session %s", sha);
server.link(conn, transfers[sha].target, max_buffer_size);
server.link(transfers[sha].target, conn, max_buffer_size);
end
else -- error, unexpected input
conn:write("\5\1\0\3\0\0\0"); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
conn:close();
module:log("debug", "Invalid SOCKS5 negotiation recieved: '%s'", b64(data));
end
end
end
function listener.ondisconnect(conn, err)
local session = sessions[conn];
if session then
if 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
function module.add_host(module)
local host, name = module:get_host(), module:get_option_string("name", "SOCKS5 Bytestreams Service");
local proxy_address = module:get_option("proxy65_address", host);
local proxy_port = module:get_option_number("proxy65_port", next(portmanager.get_active_services():search("proxy65", nil)[1]));
local proxy_acl = module:get_option("proxy65_acl");
module:add_identity("proxy", "bytestreams", name);
module:add_feature("http://jabber.org/protocol/bytestreams");
module:hook("iq-get/host/http://jabber.org/protocol/disco#info:query", function(event)
local origin, stanza = event.origin, event.stanza;
origin.send(st.reply(stanza):query("http://jabber.org/protocol/disco#info")
:tag("identity", {category='proxy', type='bytestreams', name=name}):up()
:tag("feature", {var="http://jabber.org/protocol/bytestreams"}) );
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;
origin.send(st.reply(stanza):query("http://jabber.org/protocol/disco#items"));
return true;
end, -1);
module:hook("iq-get/host/http://jabber.org/protocol/bytestreams:query", function(event)
local origin, stanza = event.origin, event.stanza;
-- check ACL
while proxy_acl and #proxy_acl > 0 do -- using 'while' instead of 'if' so we can break out of it
local jid = stanza.attr.from;
for _, acl in ipairs(proxy_acl) do
if jid_compare(jid, acl) then break; end
end
module:log("warn", "Denying use of proxy for %s", tostring(stanza.attr.from));
origin.send(st.error_reply(stanza, "auth", "forbidden"));
return true;
end
local sid = stanza.tags[1].attr.sid;
origin.send(st.reply(stanza):tag("query", {xmlns="http://jabber.org/protocol/bytestreams", sid=sid})
:tag("streamhost", {jid=host, host=proxy_address, port=proxy_port}));
return true;
end);
module:hook("iq-set/host/http://jabber.org/protocol/bytestreams:query", function(event)
local origin, stanza = event.origin, event.stanza;
local query = stanza.tags[1];
local sid = query.attr.sid;
local from = stanza.attr.from;
local to = query:get_child_text("activate");
local prepped_to = jid_prep(to);
local info = "sid: "..tostring(sid)..", initiator: "..tostring(from)..", target: "..tostring(prepped_to or to);
if prepped_to and sid then
local sha = sha1(sid .. from .. prepped_to, true);
if not transfers[sha] then
module:log("debug", "Activation request has unknown session id; activation failed (%s)", info);
origin.send(st.error_reply(stanza, "modify", "item-not-found"));
elseif not transfers[sha].initiator then
module:log("debug", "The sender was not connected to the proxy; activation failed (%s)", info);
origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The sender (you) is not connected to the proxy"));
--elseif not transfers[sha].target then -- can't happen, as target is set when a transfer object is created
-- module:log("debug", "The recipient was not connected to the proxy; activation failed (%s)", info);
-- origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The recipient is not connected to the proxy"));
else -- if transfers[sha].initiator ~= nil and transfers[sha].target ~= nil then
module:log("debug", "Transfer activated (%s)", info);
transfers[sha].activated = true;
transfers[sha].target:resume();
transfers[sha].initiator:resume();
origin.send(st.reply(stanza));
end
elseif to and sid then
module:log("debug", "Malformed activation jid; activation failed (%s)", info);
origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
else
module:log("debug", "Bad request; activation failed (%s)", info);
origin.send(st.error_reply(stanza, "modify", "bad-request"));
end
return true;
end);
end
module:provides("net", {
default_port = 5000;
listener = listener;
});
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