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 jid_split = require "util.jid".split;
  22 local sha1 = require "util.hashes".sha1;
  23 local st = require "util.stanza";
  24 local init_xmlhandlers = require "core.xmlhandlers";
  25
  26 local sessions = {};
  27
  28 local log = logger.init("componentlistener");
  29
  30 local component_listener = { default_port = 5347; default_mode = "*a"; default_interface = config.get("*", "core", "component_interface") or "127.0.0.1" };
  31
  32 local xmlns_component = 'jabber:component:accept';
  33
  34 --- Callbacks/data for xmlhandlers to handle streams for us ---
  35
  36 local stream_callbacks = { default_ns = xmlns_component };
  37
  38 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
  39
  40 function stream_callbacks.error(session, error, data, data2)
  41         if session.destroyed then return; end
  42         log("warn", "Error processing component stream: "..tostring(error));
  43         if error == "no-stream" then
  44                 session:close("invalid-namespace");
  45         elseif error == "parse-error" then
  46                 session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(data));
  47                 session:close("xml-not-well-formed");
  48         elseif error == "stream-error" then
  49                 local condition, text = "undefined-condition";
  50                 for child in data:children() do
  51                         if child.attr.xmlns == xmlns_xmpp_streams then
  52                                 if child.name ~= "text" then
  53                                         condition = child.name;
  54                                 else
  55                                         text = child:get_text();
  56                                 end
  57                                 if condition ~= "undefined-condition" and text then
  58                                         break;
  59                                 end
  60                         end
  61                 end
  62                 text = condition .. (text and (" ("..text..")") or "");
  63                 session.log("info", "Session closed by remote with error: %s", text);
  64                 session:close(nil, text);
  65         end
  66 end
  67
  68 function stream_callbacks.streamopened(session, attr)
  69         if config.get(attr.to, "core", "component_module") ~= "component" then
  70                 -- Trying to act as a component domain which
  71                 -- hasn't been configured
  72                 session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" };
  73                 return;
  74         end
  75
  76         -- Store the original host (this is used for config, etc.)
  77         session.user = attr.to;
  78         -- Set the host for future reference
  79         session.host = config.get(attr.to, "core", "component_address") or attr.to;
  80         -- Note that we don't create the internal component
  81         -- until after the external component auths successfully
  82
  83         session.streamid = uuid_gen();
  84         session.notopen = nil;
  85
  86         session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
  87                         ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());
  88
  89 end
  90
  91 function stream_callbacks.streamclosed(session)
  92         session.log("Received </stream:stream>");
  93         session:close();
  94 end
  95
  96 local core_process_stanza = core_process_stanza;
  97
  98 function stream_callbacks.handlestanza(session, stanza)
  99         -- Namespaces are icky.
 100         if not stanza.attr.xmlns and stanza.name == "handshake" then
 101                 stanza.attr.xmlns = xmlns_component;
 102         end
 103         if not stanza.attr.xmlns or stanza.attr.xmlns == "jabber:client" then
 104                 local from = stanza.attr.from;
 105                 if from then
 106                         if session.component_validate_from then
 107                                 local _, domain = jid_split(stanza.attr.from);
 108                                 if domain ~= session.host then
 109                                         -- Return error
 110                                         session.log("warn", "Component sent stanza with missing or invalid 'from' address");
 111                                         session:close{
 112                                                 condition = "invalid-from";
 113                                                 text = "Component tried to send from address <"..tostring(from)
 114                                                            .."> which is not in domain <"..tostring(session.host)..">";
 115                                         };
 116                                         return;
 117                                 end
 118                         end
 119                 else
 120                         stanza.attr.from = session.host;
 121                 end
 122                 if not stanza.attr.to then
 123                         session.log("warn", "Rejecting stanza with no 'to' address");
 124                         session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST specify a 'to' address on stanzas"));
 125                         return;
 126                 end
 127         end
 128         return core_process_stanza(session, stanza);
 129 end
 130
 131 --- Closing a component connection
 132 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
 133 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
 134 local function session_close(session, reason)
 135         if session.destroyed then return; end
 136         local log = session.log or log;
 137         if session.conn then
 138                 if session.notopen then
 139                         session.send("<?xml version='1.0'?>");
 140                         session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
 141                 end
 142                 if reason then
 143                         if type(reason) == "string" then -- assume stream error
 144                                 log("info", "Disconnecting component, <stream:error> is: %s", reason);
 145                                 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
 146                         elseif type(reason) == "table" then
 147                                 if reason.condition then
 148                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 149                                         if reason.text then
 150                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 151                                         end
 152                                         if reason.extra then
 153                                                 stanza:add_child(reason.extra);
 154                                         end
 155                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
 156                                         session.send(stanza);
 157                                 elseif reason.name then -- a stanza
 158                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
 159                                         session.send(reason);
 160                                 end
 161                         end
 162                 end
 163                 session.send("</stream:stream>");
 164                 session.conn:close();
 165                 component_listener.ondisconnect(session.conn, "stream error");
 166         end
 167 end
 168
 169 --- Component connlistener
 170 function component_listener.onincoming(conn, data)
 171         local session = sessions[conn];
 172         if not session then
 173                 local _send = conn.write;
 174                 session = { type = "component", conn = conn, send = function (data) return _send(conn, tostring(data)); end };
 175                 sessions[conn] = session;
 176
 177                 -- Logging functions --
 178
 179                 local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$");
 180                 session.log = logger.init(conn_name);
 181                 session.close = session_close;
 182
 183                 session.log("info", "Incoming Jabber component connection");
 184
 185                 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
 186                 session.parser = parser;
 187
 188                 session.notopen = true;
 189
 190                 function session.data(conn, data)
 191                         local ok, err = parser:parse(data);
 192                         if ok then return; end
 193                         log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
 194                         session:close("xml-not-well-formed");
 195                 end
 196
 197                 session.dispatch_stanza = stream_callbacks.handlestanza;
 198
 199         end
 200         if data then
 201                 session.data(conn, data);
 202         end
 203 end
 204
 205 function component_listener.ondisconnect(conn, err)
 206         local session = sessions[conn];
 207         if session then
 208                 (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
 209                 if session.host then
 210                         log("debug", "Deregistering component");
 211                         cm_deregister_component(session.host);
 212                         hosts[session.host].connected = nil;
 213                 end
 214                 sessions[conn]  = nil;
 215                 for k in pairs(session) do
 216                         if k ~= "log" and k ~= "close" then
 217                                 session[k] = nil;
 218                         end
 219                 end
 220                 session.destroyed = true;
 221                 session = nil;
 222         end
 223 end
 224
 225 connlisteners.register('xmppcomponent', component_listener);