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 t_concat = table.concat;
  11 local tostring = tostring;
  12 local type = type;
  13 local pairs = pairs;
  14
  15 local lxp = require "lxp";
  16 local logger = require "util.logger";
  17 local config = require "core.configmanager";
  18 local connlisteners = require "net.connlisteners";
  19 local uuid_gen = require "util.uuid".generate;
  20 local jid_split = require "util.jid".split;
  21 local sha1 = require "util.hashes".sha1;
  22 local st = require "util.stanza";
  23 local new_xmpp_stream = require "util.xmppstream".new;
  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 xmppstream 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("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         -- Note that we don't create the internal component
  76         -- until after the external component auths successfully
  77
  78         session.host = attr.to;
  79         session.streamid = uuid_gen();
  80         session.notopen = nil;
  81
  82         session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
  83                         ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());
  84
  85 end
  86
  87 function stream_callbacks.streamclosed(session)
  88         session.log("debug", "Received </stream:stream>");
  89         session:close();
  90 end
  91
  92 local core_process_stanza = core_process_stanza;
  93
  94 function stream_callbacks.handlestanza(session, stanza)
  95         -- Namespaces are icky.
  96         if not stanza.attr.xmlns and stanza.name == "handshake" then
  97                 stanza.attr.xmlns = xmlns_component;
  98         end
  99         if not stanza.attr.xmlns or stanza.attr.xmlns == "jabber:client" then
 100                 local from = stanza.attr.from;
 101                 if from then
 102                         if session.component_validate_from then
 103                                 local _, domain = jid_split(stanza.attr.from);
 104                                 if domain ~= session.host then
 105                                         -- Return error
 106                                         session.log("warn", "Component sent stanza with missing or invalid 'from' address");
 107                                         session:close{
 108                                                 condition = "invalid-from";
 109                                                 text = "Component tried to send from address <"..tostring(from)
 110                                                            .."> which is not in domain <"..tostring(session.host)..">";
 111                                         };
 112                                         return;
 113                                 end
 114                         end
 115                 else
 116                         stanza.attr.from = session.host;
 117                 end
 118                 if not stanza.attr.to then
 119                         session.log("warn", "Rejecting stanza with no 'to' address");
 120                         session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST specify a 'to' address on stanzas"));
 121                         return;
 122                 end
 123         end
 124         return core_process_stanza(session, stanza);
 125 end
 126
 127 --- Closing a component connection
 128 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
 129 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
 130 local function session_close(session, reason)
 131         if session.destroyed then return; end
 132         local log = session.log or log;
 133         if session.conn then
 134                 if session.notopen then
 135                         session.send("<?xml version='1.0'?>");
 136                         session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
 137                 end
 138                 if reason then
 139                         if type(reason) == "string" then -- assume stream error
 140                                 log("info", "Disconnecting component, <stream:error> is: %s", reason);
 141                                 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
 142                         elseif type(reason) == "table" then
 143                                 if reason.condition then
 144                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 145                                         if reason.text then
 146                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 147                                         end
 148                                         if reason.extra then
 149                                                 stanza:add_child(reason.extra);
 150                                         end
 151                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
 152                                         session.send(stanza);
 153                                 elseif reason.name then -- a stanza
 154                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
 155                                         session.send(reason);
 156                                 end
 157                         end
 158                 end
 159                 session.send("</stream:stream>");
 160                 session.conn:close();
 161                 component_listener.ondisconnect(session.conn, "stream error");
 162         end
 163 end
 164
 165 --- Component connlistener
 166 function component_listener.onconnect(conn)
 167         local _send = conn.write;
 168         local session = { type = "component", conn = conn, send = function (data) return _send(conn, tostring(data)); end };
 169
 170         -- Logging functions --
 171         local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$");
 172         session.log = logger.init(conn_name);
 173         session.close = session_close;
 174
 175         session.log("info", "Incoming Jabber component connection");
 176
 177         local stream = new_xmpp_stream(session, stream_callbacks);
 178         session.stream = stream;
 179
 180         session.notopen = true;
 181
 182         function session.reset_stream()
 183                 session.notopen = true;
 184                 session.stream:reset();
 185         end
 186
 187         function session.data(conn, data)
 188                 local ok, err = stream:feed(data);
 189                 if ok then return; end
 190                 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
 191                 session:close("not-well-formed");
 192         end
 193
 194         session.dispatch_stanza = stream_callbacks.handlestanza;
 195
 196         sessions[conn] = session;
 197 end
 198 function component_listener.onincoming(conn, data)
 199         local session = sessions[conn];
 200         session.data(conn, data);
 201 end
 202 function component_listener.ondisconnect(conn, err)
 203         local session = sessions[conn];
 204         if session then
 205                 (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
 206                 if session.on_destroy then session:on_destroy(err); end
 207                 sessions[conn] = nil;
 208                 for k in pairs(session) do
 209                         if k ~= "log" and k ~= "close" then
 210                                 session[k] = nil;
 211                         end
 212                 end
 213                 session.destroyed = true;
 214                 session = nil;
 215         end
 216 end
 217
 218 connlisteners.register('xmppcomponent', component_listener);