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