aboutsummaryrefslogtreecommitdiffstats
path: root/net/xmppcomponent_listener.lua
blob: a96a1cffd57eac0d948bb4f596d64a8635ebfc23 (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
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--


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 jid_split = require "util.jid".split;
local sha1 = require "util.hashes".sha1;
local st = require "util.stanza";
local init_xmlhandlers = require "core.xmlhandlers";

local sessions = {};

local log = logger.init("componentlistener");

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 = { default_ns = xmlns_component };

local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";

function stream_callbacks.error(session, error, data, data2)
	if session.destroyed then return; end
	log("warn", "Error processing component stream: "..tostring(error));
	if error == "no-stream" then
		session:close("invalid-namespace");
	elseif error == "parse-error" then
		session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(data));
		session:close("xml-not-well-formed");
	elseif error == "stream-error" then
		local condition, text = "undefined-condition";
		for child in data:children() do
			if child.attr.xmlns == xmlns_xmpp_streams then
				if child.name ~= "text" then
					condition = child.name;
				else
					text = child:get_text();
				end
				if condition ~= "undefined-condition" and text then
					break;
				end
			end
		end
		text = condition .. (text and (" ("..text..")") or "");
		session.log("info", "Session closed by remote with error: %s", text);
		session:close(nil, text);
	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
	
	-- Note that we don't create the internal component
	-- until after the external component auths successfully

	session.host = attr.to;
	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.log("debug", "Received </stream:stream>");
	session:close();
end

local core_process_stanza = core_process_stanza;

function stream_callbacks.handlestanza(session, stanza)
	-- Namespaces are icky.
	if not stanza.attr.xmlns and stanza.name == "handshake" then
		stanza.attr.xmlns = xmlns_component;
	end
	if not stanza.attr.xmlns or stanza.attr.xmlns == "jabber:client" then
		local from = stanza.attr.from;
		if from then
			if session.component_validate_from then
				local _, domain = jid_split(stanza.attr.from);
				if domain ~= session.host then
					-- Return error
					session.log("warn", "Component sent stanza with missing or invalid 'from' address");
					session:close{
						condition = "invalid-from";
						text = "Component tried to send from address <"..tostring(from)
							   .."> which is not in domain <"..tostring(session.host)..">";
					};
					return;
				end
			end
		else
			stanza.attr.from = session.host;
		end
		if not stanza.attr.to then
			session.log("warn", "Rejecting stanza with no 'to' address");
			session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST specify a 'to' address on stanzas"));
			return;
		end
	end
	return core_process_stanza(session, stanza);
end

--- Closing a component connection
local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
local function session_close(session, reason)
	if session.destroyed then return; end
	local log = session.log or log;
	if session.conn then
		if session.notopen then
			session.send("<?xml version='1.0'?>");
			session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
		end
		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.ondisconnect(session.conn, "stream error");
	end
end

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

		-- Logging functions --
		
		local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$");
		session.log = logger.init(conn_name);
		session.close = session_close;
		
		session.log("info", "Incoming Jabber component connection");
		
		local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
		session.parser = parser;
		
		session.notopen = true;
		
		function session.data(conn, data)
			local ok, err = parser:parse(data);
			if ok then return; end
			log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
			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.ondisconnect(conn, err)
	local session = sessions[conn];
	if session then
		(session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
		if hosts[session.host] then
			log("debug", "Deregistering component");
			cm_deregister_component(session.host);
			hosts[session.host].connected = nil;
		end
		sessions[conn]  = nil;
		for k in pairs(session) do
			if k ~= "log" and k ~= "close" then
				session[k] = nil;
			end
		end
		session.destroyed = true;
		session = nil;
	end
end

connlisteners.register('xmppcomponent', component_listener);