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|
-- 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 t_concat = table.concat;
local connlisteners = require "net.connlisteners";
local cm_register_component = require "core.componentmanager".register_component;
local uuid_gen = require "util.uuid".generate;
local sha1 = require "util.hashes".sha1;
local st = stanza;
local init_xmlhandlers = require "core.xmlhandlers";
local sessions = {};
local log = module._log;
local component_listener = { default_port = 5347; default_mode = "*a"; };
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)
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);
--[[
-- Helper function to deal with errors processing component stanzas
local function handleerr(err) log("error", "Traceback[component]: %s: %s", tostring(err), debug.traceback()); end
function stream_callbacks.handlestanza(a, b)
xpcall(function () core_process_stanza(a, b) end, handleerr);
end
]]
--- 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
if session.component then
deregister_component(session.host);
end
end
sessions[conn] = nil;
session = nil;
collectgarbage("collect");
end
end
connlisteners.register('component', component_listener);
module:add_event_hook("server-starting", function () connlisteners.start("component"); end);
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