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);
|
