1 -- Copyright (C) 2009 Thilo Cestonaro
3 -- This project is MIT/X11 licensed. Please see the
4 -- COPYING file in the source package for more information.
7 * to restart the proxy in the console: e.g.
8 module:unload("proxy65");
9 > server.removeserver(<proxy65_port>);
10 module:load("proxy65", <proxy65_jid>);
13 if module:get_host_type() ~= "component" then
14 error("proxy65 should be loaded as a component, please see http://prosody.im/doc/components", 0);
17 local jid_split, jid_join = require "util.jid".split, require "util.jid".join;
18 local st = require "util.stanza";
19 local componentmanager = require "core.componentmanager";
20 local config_get = require "core.configmanager".get;
21 local connlisteners = require "net.connlisteners";
22 local sha1 = require "util.hashes".sha1;
24 local host, name = module:get_host(), "SOCKS5 Bytestreams Service";
25 local sessions, transfers, component, replies_cache = {}, {}, nil, {};
27 local proxy_port = config_get(host, "core", "proxy65_port") or 5000;
28 local proxy_interface = config_get(host, "core", "proxy65_interface") or "*";
29 local proxy_address = config_get(host, "core", "proxy65_address") or (proxy_interface ~= "*" and proxy_interface) or host;
30 local proxy_acl = config_get(host, "core", "proxy65_acl");
32 local connlistener = { default_port = proxy_port, default_interface = proxy_interface, default_mode = "*a" };
34 function connlistener.onincoming(conn, data)
35 local session = sessions[conn] or {};
37 if session.setup == nil and data ~= nil and data:sub(1):byte() == 0x05 and data:len() > 2 then
38 local nmethods = data:sub(2):byte();
39 local methods = data:sub(3);
40 local supported = false;
41 for i=1, nmethods, 1 do
42 if(methods:sub(i):byte() == 0x00) then -- 0x00 == method: NO AUTH
48 module:log("debug", "new session found ... ")
50 sessions[conn] = session;
51 conn:write(string.char(5, 0));
56 if session.sha ~= nil and transfers[session.sha] ~= nil then
57 local sha = session.sha;
58 if transfers[sha].activated == true and transfers[sha].initiator == conn and transfers[sha].target ~= nil then
59 transfers[sha].target:write(data);
63 if data ~= nil and data:len() == 0x2F and -- 40 == length of SHA1 HASH, and 7 other bytes => 47 => 0x2F
64 data:sub(1):byte() == 0x05 and -- SOCKS5 has 5 in first byte
65 data:sub(2):byte() == 0x01 and -- CMD must be 1
66 data:sub(3):byte() == 0x00 and -- RSV must be 0
67 data:sub(4):byte() == 0x03 and -- ATYP must be 3
68 data:sub(5):byte() == 40 and -- SHA1 HASH length must be 40 (0x28)
69 data:sub(-2):byte() == 0x00 and -- PORT must be 0, size 2 byte
70 data:sub(-1):byte() == 0x00
72 local sha = data:sub(6, 45); -- second param is not count! it's the ending index (included!)
73 if transfers[sha] == nil then
75 transfers[sha].activated = false;
76 transfers[sha].target = conn;
78 module:log("debug", "target connected ... ");
79 elseif transfers[sha].target ~= nil then
80 transfers[sha].initiator = conn;
82 module:log("debug", "initiator connected ... ");
83 throttle_sending(conn, transfers[sha].target);
85 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)
87 module:log("warn", "Neither data transfer nor initial connect of a participator of a transfer.")
92 module:log("warn", "unknown connection with no authentication data -> closing it");
98 function connlistener.ondisconnect(conn, err)
99 local session = sessions[conn];
101 if session.sha and transfers[session.sha] then
102 local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target;
103 if initiator == conn and target ~= nil then
105 elseif target == conn and initiator ~= nil then
108 transfers[session.sha] = nil;
110 -- Clean up any session-related stuff here
111 sessions[conn] = nil;
115 local function get_disco_info(stanza)
116 local reply = replies_cache.disco_info;
118 reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#info")
119 :tag("identity", {category='proxy', type='bytestreams', name=name}):up()
120 :tag("feature", {var="http://jabber.org/protocol/bytestreams"});
121 replies_cache.disco_info = reply;
124 reply.attr.id = stanza.attr.id;
125 reply.attr.to = stanza.attr.from;
129 local function get_disco_items(stanza)
130 local reply = replies_cache.disco_items;
132 reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#items");
133 replies_cache.disco_items = reply;
136 reply.attr.id = stanza.attr.id;
137 reply.attr.to = stanza.attr.from;
141 local function get_stream_host(origin, stanza)
142 local reply = replies_cache.stream_host;
143 local err_reply = replies_cache.stream_host_err;
144 local sid = stanza.tags[1].attr.sid;
146 local jid_node, jid_host, jid_resource = jid_split(stanza.attr.from);
148 if stanza.attr.from == nil then
149 jid_node = origin.username;
150 jid_host = origin.host;
151 jid_resource = origin.resource;
154 if proxy_acl and #proxy_acl > 0 then
155 if host ~= nil then -- at least a domain is needed.
156 for _, acl in ipairs(proxy_acl) do
157 local acl_node, acl_host, acl_resource = jid_split(acl);
158 if ((acl_node ~= nil and acl_node == jid_node) or acl_node == nil) and
159 ((acl_host ~= nil and acl_host == jid_host) or acl_host == nil) and
160 ((acl_resource ~= nil and acl_resource == jid_resource) or acl_resource == nil) then
168 if allow == true then
170 reply = st.iq({type="result", from=host})
171 :query("http://jabber.org/protocol/bytestreams")
172 :tag("streamhost", {jid=host, host=proxy_address, port=proxy_port});
173 replies_cache.stream_host = reply;
176 module:log("warn", "Denying use of proxy for %s", tostring(jid_join(jid_node, jid_host, jid_resource)));
177 if err_reply == nil then
178 err_reply = st.iq({type="error", from=host})
179 :query("http://jabber.org/protocol/bytestreams")
180 :tag("error", {code='403', type='auth'})
181 :tag("forbidden", {xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'});
182 replies_cache.stream_host_err = err_reply;
186 reply.attr.id = stanza.attr.id;
187 reply.attr.to = stanza.attr.from;
188 reply.tags[1].attr.sid = sid;
192 module.unload = function()
193 componentmanager.deregister_component(host);
194 connlisteners.deregister(module.host .. ':proxy65');
197 local function set_activation(stanza)
198 local from, to, sid, reply = nil;
199 from = stanza.attr.from;
200 if stanza.tags[1] ~= nil and tostring(stanza.tags[1].name) == "query" then
201 if stanza.tags[1].attr ~= nil then
202 sid = stanza.tags[1].attr.sid;
204 if stanza.tags[1].tags[1] ~= nil and tostring(stanza.tags[1].tags[1].name) == "activate" then
205 to = stanza.tags[1].tags[1][1];
208 if from ~= nil and to ~= nil and sid ~= nil then
209 reply = st.iq({type="result", from=host, to=from});
210 reply.attr.id = stanza.attr.id;
212 return reply, from, to, sid;
215 function handle_to_domain(origin, stanza)
216 local to_node, to_host, to_resource = jid_split(stanza.attr.to);
217 if to_node == nil then
218 local type = stanza.attr.type;
219 if type == "error" or type == "result" then return; end
220 if stanza.name == "iq" and type == "get" then
221 local xmlns = stanza.tags[1].attr.xmlns
222 if xmlns == "http://jabber.org/protocol/disco#info" then
223 origin.send(get_disco_info(stanza));
225 elseif xmlns == "http://jabber.org/protocol/disco#items" then
226 origin.send(get_disco_items(stanza));
228 elseif xmlns == "http://jabber.org/protocol/bytestreams" then
229 origin.send(get_stream_host(origin, stanza));
232 elseif stanza.name == "iq" and type == "set" then
233 local reply, from, to, sid = set_activation(stanza);
234 if reply ~= nil and from ~= nil and to ~= nil and sid ~= nil then
235 local sha = sha1(sid .. from .. to, true);
236 if transfers[sha] == nil then
237 module:log("error", "transfers[sha]: nil");
238 elseif(transfers[sha] ~= nil and transfers[sha].initiator ~= nil and transfers[sha].target ~= nil) then
240 transfers[sha].activated = true;
243 module:log("error", "activation failed: sid: %s, initiator: %s, target: %s", tostring(sid), tostring(from), tostring(to));
250 if not connlisteners.register(module.host .. ':proxy65', connlistener) then
251 module:log("error", "mod_proxy65: Could not establish a connection listener. Check your configuration please.");
252 module:log("error", "Possibly two proxy65 components are configured to share the same port.");
255 connlisteners.start(module.host .. ':proxy65');
256 component = componentmanager.register_component(host, handle_to_domain);
257 local sender_lock_threshold = 4096;
258 function throttle_sending(sender, receiver)
259 sender:pattern(sender_lock_threshold);
261 local _sendbuffer = receiver.sendbuffer;
262 function receiver.sendbuffer()
264 if sender_locked and receiver.bufferlen() < sender_lock_threshold then
265 sender:lock_read(false); -- Unlock now
270 local _readbuffer = sender.readbuffer;
271 function sender.readbuffer()
273 if not sender_locked and receiver.bufferlen() >= sender_lock_threshold then
274 sender_locked = true;
275 sender:lock_read(true);