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-rw-r--r--plugins/mod_component.lua217
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);