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| -rw-r--r-- | plugins/mod_component.lua | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/plugins/mod_component.lua b/plugins/mod_component.lua new file mode 100644 index 00000000..57679ca9 --- /dev/null +++ b/plugins/mod_component.lua @@ -0,0 +1,217 @@ +-- 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); |