prosody
c5d87a3316f8
plugins/mod_proxy65.lua

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plugins/mod_proxy65.lua @ 2137:c5d87a3316f8

mod_proxy65: Import from prosody-modules, thanks Ephraim :)
author Matthew Wild <mwild1@gmail.com>
date Sun, 22 Nov 2009 14:58:09 +0000
child 2138:8bb1a2d82896
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2136:23c687039652 2137:c5d87a3316f8
1 -- Copyright (C) 2009 Thilo Cestonaro
2 --
3 -- This project is MIT/X11 licensed. Please see the
4 -- COPYING file in the source package for more information.
5 --
6 --[[
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>);
11 ]]--
12
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);
15 end
16
17 local jid_split = require "util.jid".split;
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;
23
24 local host, name = module:get_host(), "SOCKS5 Bytestreams Service";
25 local sessions, transfers, component, replies_cache = {}, {}, nil, {};
26
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");
31
32 local connlistener = { default_port = proxy_port, default_interface = proxy_interface, default_mode = "*a" };
33
34 function connlistener.listener(conn, data)
35 local session = sessions[conn] or {};
36
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
43 supported = true;
44 break;
45 end
46 end
47 if(supported) then
48 module:log("debug", "new session found ... ")
49 session.setup = true;
50 sessions[conn] = session;
51 conn.write(string.char(5, 0));
52 end
53 return;
54 end
55 if session.setup then
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);
60 return;
61 end
62 end
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
71 then
72 local sha = data:sub(6, 45); -- second param is not count! it's the ending index (included!)
73 if transfers[sha] == nil then
74 transfers[sha] = {};
75 transfers[sha].activated = false;
76 transfers[sha].target = conn;
77 session.sha = sha;
78 module:log("debug", "target connected ... ");
79 elseif transfers[sha].target ~= nil then
80 transfers[sha].initiator = conn;
81 session.sha = sha;
82 module:log("debug", "initiator connected ... ");
83 end
84 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)
85 else
86 log:module("warn", "Neither data transfer nor initial connect of a participator of a transfer.")
87 conn.close();
88 end
89 else
90 if data ~= nil then
91 module:log("warn", "unknown connection with no authentication data -> closing it");
92 conn.close();
93 end
94 end
95 end
96
97 function connlistener.disconnect(conn, err)
98 local session = sessions[conn];
99 if session then
100 if session.sha and transfers[session.sha] then
101 local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target;
102 if initiator == conn and target ~= nil then
103 target.close();
104 elseif target == conn and initiator ~= nil then
105 initiator.close();
106 end
107 transfers[session.sha] = nil;
108 end
109 -- Clean up any session-related stuff here
110 sessions[conn] = nil;
111 end
112 end
113
114 local function get_disco_info(stanza)
115 local reply = replies_cache.disco_info;
116 if reply == nil then
117 reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#info")
118 :tag("identity", {category='proxy', type='bytestreams', name=name}):up()
119 :tag("feature", {var="http://jabber.org/protocol/bytestreams"});
120 replies_cache.disco_info = reply;
121 end
122
123 reply.attr.id = stanza.attr.id;
124 reply.attr.to = stanza.attr.from;
125 return reply;
126 end
127
128 local function get_disco_items(stanza)
129 local reply = replies_cache.disco_items;
130 if reply == nil then
131 reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#items");
132 replies_cache.disco_items = reply;
133 end
134
135 reply.attr.id = stanza.attr.id;
136 reply.attr.to = stanza.attr.from;
137 return reply;
138 end
139
140 local function _jid_join(node, host, resource)
141 local ret = host;
142 if ret then
143 if node then
144 ret = node .. "@" .. ret;
145 end
146 if resource then
147 ret = ret .. "/" .. resource;
148 end
149 end
150 return ret;
151 end
152
153 local function get_stream_host(origin, stanza)
154 local reply = replies_cache.stream_host;
155 local err_reply = replies_cache.stream_host_err;
156 local sid = stanza.tags[1].attr.sid;
157 local allow = false;
158 local jid_node, jid_host, jid_resource = jid_split(stanza.attr.from);
159
160 if stanza.attr.from == nil then
161 jid_node = origin.username;
162 jid_host = origin.host;
163 jid_resource = origin.resource;
164 end
165
166 if proxy_acl and #proxy_acl > 0 then
167 if host ~= nil then -- at least a domain is needed.
168 for _, acl in ipairs(proxy_acl) do
169 local acl_node, acl_host, acl_resource = jid_split(acl);
170 if ((acl_node ~= nil and acl_node == jid_node) or acl_node == nil) and
171 ((acl_host ~= nil and acl_host == jid_host) or acl_host == nil) and
172 ((acl_resource ~= nil and acl_resource == jid_resource) or acl_resource == nil) then
173 allow = true;
174 end
175 end
176 end
177 else
178 allow = true;
179 end
180 if allow == true then
181 if reply == nil then
182 reply = st.iq({type="result", from=host})
183 :query("http://jabber.org/protocol/bytestreams")
184 :tag("streamhost", {jid=host, host=proxy_address, port=proxy_port});
185 replies_cache.stream_host = reply;
186 end
187 else
188 module:log("warn", "Denying use of proxy for %s", tostring(_jid_join(jid_node, jid_host, jid_resource)));
189 if err_reply == nil then
190 err_reply = st.iq({type="error", from=host})
191 :query("http://jabber.org/protocol/bytestreams")
192 :tag("error", {code='403', type='auth'})
193 :tag("forbidden", {xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'});
194 replies_cache.stream_host_err = err_reply;
195 end
196 reply = err_reply;
197 end
198 reply.attr.id = stanza.attr.id;
199 reply.attr.to = stanza.attr.from;
200 reply.tags[1].attr.sid = sid;
201 return reply;
202 end
203
204 module.unload = function()
205 componentmanager.deregister_component(host);
206 connlisteners.deregister(module.host .. ':proxy65');
207 end
208
209 local function set_activation(stanza)
210 local from, to, sid, reply = nil;
211 from = stanza.attr.from;
212 if stanza.tags[1] ~= nil and tostring(stanza.tags[1].name) == "query" then
213 if stanza.tags[1].attr ~= nil then
214 sid = stanza.tags[1].attr.sid;
215 end
216 if stanza.tags[1].tags[1] ~= nil and tostring(stanza.tags[1].tags[1].name) == "activate" then
217 to = stanza.tags[1].tags[1][1];
218 end
219 end
220 if from ~= nil and to ~= nil and sid ~= nil then
221 reply = st.iq({type="result", from=host, to=from});
222 reply.attr.id = stanza.attr.id;
223 end
224 return reply, from, to, sid;
225 end
226
227 function handle_to_domain(origin, stanza)
228 local to_node, to_host, to_resource = jid_split(stanza.attr.to);
229 if to_node == nil then
230 local type = stanza.attr.type;
231 if type == "error" or type == "result" then return; end
232 if stanza.name == "iq" and type == "get" then
233 local xmlns = stanza.tags[1].attr.xmlns
234 if xmlns == "http://jabber.org/protocol/disco#info" then
235 origin.send(get_disco_info(stanza));
236 return true;
237 elseif xmlns == "http://jabber.org/protocol/disco#items" then
238 origin.send(get_disco_items(stanza));
239 return true;
240 elseif xmlns == "http://jabber.org/protocol/bytestreams" then
241 origin.send(get_stream_host(origin, stanza));
242 return true;
243 end
244 elseif stanza.name == "iq" and type == "set" then
245 local reply, from, to, sid = set_activation(stanza);
246 if reply ~= nil and from ~= nil and to ~= nil and sid ~= nil then
247 local sha = sha1(sid .. from .. to, true);
248 if transfers[sha] == nil then
249 module:log("error", "transfers[sha]: nil");
250 elseif(transfers[sha] ~= nil and transfers[sha].initiator ~= nil and transfers[sha].target ~= nil) then
251 origin.send(reply);
252 transfers[sha].activated = true;
253 end
254 else
255 module:log("error", "activation failed: sid: %s, initiator: %s, target: %s", tostring(sid), tostring(from), tostring(to));
256 end
257 end
258 end
259 return;
260 end
261
262 if not connlisteners.register(module.host .. ':proxy65', connlistener) then
263 error("mod_proxy65: Could not establish a connection listener. Check your configuration please.");
264 error(" one possible cause for this would be that two proxy65 components share the same port.");
265 end
266
267 connlisteners.start(module.host .. ':proxy65');
268 component = componentmanager.register_component(host, handle_to_domain);