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 local tostring = tostring;
  14 local type = type;
  15 local pairs = pairs;
  16
  17 local lxp = require "lxp";
  18 local logger = require "util.logger";
  19 local config = require "core.configmanager";
  20 local connlisteners = require "net.connlisteners";
  21 local uuid_gen = require "util.uuid".generate;
  22 local jid_split = require "util.jid".split;
  23 local sha1 = require "util.hashes".sha1;
  24 local st = require "util.stanza";
  25 local new_xmpp_stream = require "util.xmppstream".new;
  26
  27 local sessions = {};
  28
  29 local log = logger.init("componentlistener");
  30
  31 local component_listener = { default_port = 5347; default_mode = "*a"; default_interface = config.get("*", "core", "component_interface") or "127.0.0.1" };
  32
  33 local xmlns_component = 'jabber:component:accept';
  34
  35 --- Callbacks/data for xmppstream to handle streams for us ---
  36
  37 local stream_callbacks = { default_ns = xmlns_component };
  38
  39 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
  40
  41 function stream_callbacks.error(session, error, data, data2)
  42         if session.destroyed then return; end
  43         log("warn", "Error processing component stream: "..tostring(error));
  44         if error == "no-stream" then
  45                 session:close("invalid-namespace");
  46         elseif error == "parse-error" then
  47                 session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(data));
  48                 session:close("not-well-formed");
  49         elseif error == "stream-error" then
  50                 local condition, text = "undefined-condition";
  51                 for child in data:children() do
  52                         if child.attr.xmlns == xmlns_xmpp_streams then
  53                                 if child.name ~= "text" then
  54                                         condition = child.name;
  55                                 else
  56                                         text = child:get_text();
  57                                 end
  58                                 if condition ~= "undefined-condition" and text then
  59                                         break;
  60                                 end
  61                         end
  62                 end
  63                 text = condition .. (text and (" ("..text..")") or "");
  64                 session.log("info", "Session closed by remote with error: %s", text);
  65                 session:close(nil, text);
  66         end
  67 end
  68
  69 function stream_callbacks.streamopened(session, attr)
  70         if config.get(attr.to, "core", "component_module") ~= "component" then
  71                 -- Trying to act as a component domain which
  72                 -- hasn't been configured
  73                 session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" };
  74                 return;
  75         end
  76
  77         -- Note that we don't create the internal component
  78         -- until after the external component auths successfully
  79
  80         session.host = attr.to;
  81         session.streamid = uuid_gen();
  82         session.notopen = nil;
  83
  84         session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
  85                         ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());
  86
  87 end
  88
  89 function stream_callbacks.streamclosed(session)
  90         session.log("debug", "Received </stream:stream>");
  91         session:close();
  92 end
  93
  94 local core_process_stanza = core_process_stanza;
  95
  96 function stream_callbacks.handlestanza(session, stanza)
  97         -- Namespaces are icky.
  98         if not stanza.attr.xmlns and stanza.name == "handshake" then
  99                 stanza.attr.xmlns = xmlns_component;
 100         end
 101         if not stanza.attr.xmlns or stanza.attr.xmlns == "jabber:client" then
 102                 local from = stanza.attr.from;
 103                 if from then
 104                         if session.component_validate_from then
 105                                 local _, domain = jid_split(stanza.attr.from);
 106                                 if domain ~= session.host then
 107                                         -- Return error
 108                                         session.log("warn", "Component sent stanza with missing or invalid 'from' address");
 109                                         session:close{
 110                                                 condition = "invalid-from";
 111                                                 text = "Component tried to send from address <"..tostring(from)
 112                                                            .."> which is not in domain <"..tostring(session.host)..">";
 113                                         };
 114                                         return;
 115                                 end
 116                         end
 117                 else
 118                         stanza.attr.from = session.host;
 119                 end
 120                 if not stanza.attr.to then
 121                         session.log("warn", "Rejecting stanza with no 'to' address");
 122                         session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST specify a 'to' address on stanzas"));
 123                         return;
 124                 end
 125         end
 126         return core_process_stanza(session, stanza);
 127 end
 128
 129 --- Closing a component connection
 130 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
 131 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
 132 local function session_close(session, reason)
 133         if session.destroyed then return; end
 134         local log = session.log or log;
 135         if session.conn then
 136                 if session.notopen then
 137                         session.send("<?xml version='1.0'?>");
 138                         session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
 139                 end
 140                 if reason then
 141                         if type(reason) == "string" then -- assume stream error
 142                                 log("info", "Disconnecting component, <stream:error> is: %s", reason);
 143                                 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
 144                         elseif type(reason) == "table" then
 145                                 if reason.condition then
 146                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 147                                         if reason.text then
 148                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 149                                         end
 150                                         if reason.extra then
 151                                                 stanza:add_child(reason.extra);
 152                                         end
 153                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
 154                                         session.send(stanza);
 155                                 elseif reason.name then -- a stanza
 156                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
 157                                         session.send(reason);
 158                                 end
 159                         end
 160                 end
 161                 session.send("</stream:stream>");
 162                 session.conn:close();
 163                 component_listener.ondisconnect(session.conn, "stream error");
 164         end
 165 end
 166
 167 --- Component connlistener
 168 function component_listener.onconnect(conn)
 169         local _send = conn.write;
 170         local session = { type = "component", conn = conn, send = function (data) return _send(conn, tostring(data)); end };
 171
 172         -- Logging functions --
 173         local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$");
 174         session.log = logger.init(conn_name);
 175         session.close = session_close;
 176
 177         session.log("info", "Incoming Jabber component connection");
 178
 179         local stream = new_xmpp_stream(session, stream_callbacks);
 180         session.stream = stream;
 181
 182         session.notopen = true;
 183
 184         function session.reset_stream()
 185                 session.notopen = true;
 186                 session.stream:reset();
 187         end
 188
 189         function session.data(conn, data)
 190                 local ok, err = stream:feed(data);
 191                 if ok then return; end
 192                 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
 193                 session:close("not-well-formed");
 194         end
 195
 196         session.dispatch_stanza = stream_callbacks.handlestanza;
 197
 198         sessions[conn] = session;
 199 end
 200 function component_listener.onincoming(conn, data)
 201         local session = sessions[conn];
 202         session.data(conn, data);
 203 end
 204 function component_listener.ondisconnect(conn, err)
 205         local session = sessions[conn];
 206         if session then
 207                 (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
 208                 if session.on_destroy then session:on_destroy(err); end
 209                 sessions[conn] = nil;
 210                 for k in pairs(session) do
 211                         if k ~= "log" and k ~= "close" then
 212                                 session[k] = nil;
 213                         end
 214                 end
 215                 session.destroyed = true;
 216                 session = nil;
 217         end
 218 end
 219
 220 connlisteners.register('xmppcomponent', component_listener);