aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_component.lua
blob: e5ea47a28a7eba4e87be6af2817c3f839e575be6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
-- Prosody IM v0.4
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

if module:get_host_type() ~= "component" then
	error("Don't load mod_component manually, it should be for a component, please see http://prosody.im/doc/components", 0);
end

local hosts = _G.hosts;

local t_concat = table.concat;

local lxp = require "lxp";
local logger = require "util.logger";
local config = require "core.configmanager";
local connlisteners = require "net.connlisteners";
local cm_register_component = require "core.componentmanager".register_component;
local cm_deregister_component = require "core.componentmanager".deregister_component;
local uuid_gen = require "util.uuid".generate;
local sha1 = require "util.hashes".sha1;
local st = require "util.stanza";
local init_xmlhandlers = require "core.xmlhandlers";

local sessions = {};

local log = module._log;

local component_listener = { default_port = 5347; default_mode = "*a"; default_interface = config.get("*", "core", "component_interface") or "127.0.0.1" };

local xmlns_component = 'jabber:component:accept';

--- Callbacks/data for xmlhandlers to handle streams for us ---

local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams|stream", default_ns = xmlns_component };

function stream_callbacks.error(session, error, data, data2)
	log("warn", "Error processing component stream: "..tostring(error));
	if error == "no-stream" then
		session:close("invalid-namespace");
	elseif error == "xml-parse-error" and data == "unexpected-element-close" then
		session.log("debug", "Unexpected close of '%s' tag", data2);
		session:close("xml-not-well-formed");
	else
		session.log("debug", "External component %s XML parse error: %s", tostring(session.host), tostring(error));
		print(data, debug.traceback())
		session:close("xml-not-well-formed");
	end
end

function stream_callbacks.streamopened(session, attr)
	if config.get(attr.to, "core", "component_module") ~= "component" then
		-- Trying to act as a component domain which 
		-- hasn't been configured
		session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" };
		return;
	end
	
	-- Store the original host (this is used for config, etc.)
	session.user = attr.to;
	-- Set the host for future reference
	session.host = config.get(attr.to, "core", "component_address") or attr.to;
	-- Note that we don't create the internal component 
	-- until after the external component auths successfully

	session.streamid = uuid_gen();
	session.notopen = nil;
	
	session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
			["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());

end

function stream_callbacks.streamclosed(session)
	session.send("</stream:stream>");
	session.notopen = true;
end

local core_process_stanza = core_process_stanza;

function stream_callbacks.handlestanza(session, stanza)
	-- Namespaces are icky.
	log("warn", "Handing stanza with name %s", stanza.name);
	if stanza.name ~= "handshake" then
		return core_process_stanza(session, stanza);
	else
		handle_component_auth(session, stanza);
	end
end

--- Handle authentication attempts by components
function handle_component_auth(session, stanza)
	if (not session.host) or #stanza.tags > 0 then
		session:close("not-authorized");
		return;
	end
	
	local secret = config.get(session.user, "core", "component_secret");
	if not secret then
		log("warn", "Component attempted to identify as %s, but component_password is not set", session.user);
		session:close("not-authorized");
		return;
	end
	
	local supplied_token = t_concat(stanza);
	local calculated_token = sha1(session.streamid..secret, true);
	if supplied_token:lower() ~= calculated_token:lower() then
		session:close{ condition = "not-authorized", text = "Given token does not match calculated token" };
		return;
	end
	
	
	-- Authenticated now
	
	-- If component not already created for this host, create one now
	if not hosts[session.host].connected then
		local send = session.send;
		session.component_session = cm_register_component(session.host, function (_, data) return send(data); end);
		hosts[session.host].connected = true;
	else
		log("error", "Multiple components bound to the same address, first one wins (TODO: Implement stanza distribution)");
	end
	
	-- Signal successful authentication
	session.send(st.stanza("handshake"));
end

module:add_handler("component", "handshake", xmlns_component, handle_component_auth);

--- Closing a component connection
local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
local function session_close(session, reason)
	local log = session.log or log;
	if session.conn then
		if reason then
			if type(reason) == "string" then -- assume stream error
				log("info", "Disconnecting component, <stream:error> is: %s", reason);
				session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
			elseif type(reason) == "table" then
				if reason.condition then
					local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
					if reason.text then
						stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
					end
					if reason.extra then
						stanza:add_child(reason.extra);
					end
					log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
					session.send(stanza);
				elseif reason.name then -- a stanza
					log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
					session.send(reason);
				end
			end
		end
		session.send("</stream:stream>");
		session.conn.close();
		component_listener.disconnect(session.conn, "stream error");
	end
end

--- Component connlistener
function component_listener.listener(conn, data)
	local session = sessions[conn];
	if not session then
		local _send = conn.write;
		session = { type = "component", conn = conn, send = function (data) return _send(tostring(data)); end };
		sessions[conn] = session;

		-- Logging functions --
		
		local conn_name = "xep114-"..tostring(conn):match("[a-f0-9]+$");
		session.log = logger.init(conn_name);
		session.close = session_close;
		
		session.log("info", "Incoming XEP-0114 connection");
		
		local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "|");
		session.parser = parser;
		
		session.notopen = true;
		
		function session.data(conn, data)
			local ok, err = parser:parse(data);
			if ok then return; end
			session:close("xml-not-well-formed");
		end
		
		session.dispatch_stanza = stream_callbacks.handlestanza;
		
	end
	if data then
		session.data(conn, data);
	end
end
	
function component_listener.disconnect(conn, err)
	local session = sessions[conn];
	if session then
		(session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
		if session.host then
			log("debug", "deregistering component");
			cm_deregister_component(session.host);
			hosts[session.host].connected = nil;
		end
		sessions[conn]  = nil;
		session = nil;
		collectgarbage("collect");
	end
end

connlisteners.register('component', component_listener);

module:add_event_hook("server-started", 
	function ()
		if _G.net_activate_ports then
			_G.net_activate_ports("component", "component", {5437}, "tcp");
		else
			error("No net_activate_ports: Using an incompatible version of Prosody?");
		end
	end);