-- 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"; 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) 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, 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, is: %s", tostring(stanza)); session.send(stanza); elseif reason.name then -- a stanza log("info", "Disconnecting component, is: %s", tostring(reason)); session.send(reason); end end end session.send(""); 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-started", function () if net_activate_ports then net_activate_ports("component_ports", "component", {5437}, "tcp"); else error("No net_activate_ports: Using an incompatible version of Prosody?"); end end);