-- 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 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 "); 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(""); 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, 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.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 session.on_destroy then session:on_destroy(err); 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);