net/xmppcomponent_listener.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10 local hosts = _G.hosts;
  11
  12 local t_concat = table.concat;
  13
  14 local lxp = require "lxp";
  15 local logger = require "util.logger";
  16 local config = require "core.configmanager";
  17 local connlisteners = require "net.connlisteners";
  18 local cm_register_component = require "core.componentmanager".register_component;
  19 local cm_deregister_component = require "core.componentmanager".deregister_component;
  20 local uuid_gen = require "util.uuid".generate;
  21 local sha1 = require "util.hashes".sha1;
  22 local st = require "util.stanza";
  23 local init_xmlhandlers = require "core.xmlhandlers";
  24
  25 local sessions = {};
  26
  27 local log = logger.init("componentlistener");
  28
  29 local component_listener = { default_port = 5347; default_mode = "*a"; default_interface = config.get("*", "core", "component_interface") or "127.0.0.1" };
  30
  31 local xmlns_component = 'jabber:component:accept';
  32
  33 --- Callbacks/data for xmlhandlers to handle streams for us ---
  34
  35 local stream_callbacks = { default_ns = xmlns_component };
  36
  37 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
  38
  39 function stream_callbacks.error(session, error, data, data2)
  40         if session.destroyed then return; end
  41         log("warn", "Error processing component stream: "..tostring(error));
  42         if error == "no-stream" then
  43                 session:close("invalid-namespace");
  44         elseif error == "parse-error" then
  45                 session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(data));
  46                 session:close("xml-not-well-formed");
  47         elseif error == "stream-error" then
  48                 local condition, text = "undefined-condition";
  49                 for child in data:children() do
  50                         if child.attr.xmlns == xmlns_xmpp_streams then
  51                                 if child.name ~= "text" then
  52                                         condition = child.name;
  53                                 else
  54                                         text = child:get_text();
  55                                 end
  56                                 if condition ~= "undefined-condition" and text then
  57                                         break;
  58                                 end
  59                         end
  60                 end
  61                 text = condition .. (text and (" ("..text..")") or "");
  62                 session.log("info", "Session closed by remote with error: %s", text);
  63                 session:close(nil, text);
  64         end
  65 end
  66
  67 function stream_callbacks.streamopened(session, attr)
  68         if config.get(attr.to, "core", "component_module") ~= "component" then
  69                 -- Trying to act as a component domain which
  70                 -- hasn't been configured
  71                 session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" };
  72                 return;
  73         end
  74
  75         -- Store the original host (this is used for config, etc.)
  76         session.user = attr.to;
  77         -- Set the host for future reference
  78         session.host = config.get(attr.to, "core", "component_address") or attr.to;
  79         -- Note that we don't create the internal component
  80         -- until after the external component auths successfully
  81
  82         session.streamid = uuid_gen();
  83         session.notopen = nil;
  84
  85         session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
  86                         ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());
  87
  88 end
  89
  90 function stream_callbacks.streamclosed(session)
  91         session.log("Received </stream:stream>");
  92         session:close();
  93 end
  94
  95 local core_process_stanza = core_process_stanza;
  96
  97 function stream_callbacks.handlestanza(session, stanza)
  98         -- Namespaces are icky.
  99         if not stanza.attr.xmlns and stanza.name == "handshake" then
 100                 stanza.attr.xmlns = xmlns_component;
 101         end
 102         return core_process_stanza(session, stanza);
 103 end
 104
 105 --- Closing a component connection
 106 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
 107 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
 108 local function session_close(session, reason)
 109         if session.destroyed then return; end
 110         local log = session.log or log;
 111         if session.conn then
 112                 if session.notopen then
 113                         session.send("<?xml version='1.0'?>");
 114                         session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
 115                 end
 116                 if reason then
 117                         if type(reason) == "string" then -- assume stream error
 118                                 log("info", "Disconnecting component, <stream:error> is: %s", reason);
 119                                 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
 120                         elseif type(reason) == "table" then
 121                                 if reason.condition then
 122                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 123                                         if reason.text then
 124                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 125                                         end
 126                                         if reason.extra then
 127                                                 stanza:add_child(reason.extra);
 128                                         end
 129                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
 130                                         session.send(stanza);
 131                                 elseif reason.name then -- a stanza
 132                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
 133                                         session.send(reason);
 134                                 end
 135                         end
 136                 end
 137                 session.send("</stream:stream>");
 138                 session.conn:close();
 139                 component_listener.ondisconnect(session.conn, "stream error");
 140         end
 141 end
 142
 143 --- Component connlistener
 144 function component_listener.onincoming(conn, data)
 145         local session = sessions[conn];
 146         if not session then
 147                 local _send = conn.write;
 148                 session = { type = "component", conn = conn, send = function (data) return _send(conn, tostring(data)); end };
 149                 sessions[conn] = session;
 150
 151                 -- Logging functions --
 152
 153                 local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$");
 154                 session.log = logger.init(conn_name);
 155                 session.close = session_close;
 156
 157                 session.log("info", "Incoming Jabber component connection");
 158
 159                 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
 160                 session.parser = parser;
 161
 162                 session.notopen = true;
 163
 164                 function session.data(conn, data)
 165                         local ok, err = parser:parse(data);
 166                         if ok then return; end
 167                         log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
 168                         session:close("xml-not-well-formed");
 169                 end
 170
 171                 session.dispatch_stanza = stream_callbacks.handlestanza;
 172
 173         end
 174         if data then
 175                 session.data(conn, data);
 176         end
 177 end
 178
 179 function component_listener.ondisconnect(conn, err)
 180         local session = sessions[conn];
 181         if session then
 182                 (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
 183                 if session.host then
 184                         log("debug", "Deregistering component");
 185                         cm_deregister_component(session.host);
 186                         hosts[session.host].connected = nil;
 187                 end
 188                 sessions[conn]  = nil;
 189                 for k in pairs(session) do
 190                         if k ~= "log" and k ~= "close" then
 191                                 session[k] = nil;
 192                         end
 193                 end
 194                 session.destroyed = true;
 195                 session = nil;
 196         end
 197 end
 198
 199 connlisteners.register('xmppcomponent', component_listener);