plugins/mod_c2s.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 module:set_global();
  10
  11 local add_task = require "util.timer".add_task;
  12 local new_xmpp_stream = require "util.xmppstream".new;
  13 local nameprep = require "util.encodings".stringprep.nameprep;
  14 local portmanager = require "core.portmanager";
  15 local sessionmanager = require "core.sessionmanager";
  16 local st = require "util.stanza";
  17 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
  18 local uuid_generate = require "util.uuid".generate;
  19
  20 local xpcall, tostring, type = xpcall, tostring, type;
  21 local format = string.format;
  22 local traceback = debug.traceback;
  23
  24 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
  25
  26 local log = module._log;
  27
  28 local c2s_timeout = module:get_option_number("c2s_timeout");
  29 local opt_keepalives = module:get_option_boolean("tcp_keepalives", false);
  30
  31 local sessions = module:shared("sessions");
  32
  33 local stream_callbacks = { default_ns = "jabber:client", handlestanza = core_process_stanza };
  34 local listener = {};
  35
  36 --- Stream events handlers
  37 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  38 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
  39
  40 function stream_callbacks.streamopened(session, attr)
  41         local send = session.send;
  42         session.host = nameprep(attr.to);
  43         if not session.host then
  44                 session:close{ condition = "improper-addressing",
  45                         text = "A valid 'to' attribute is required on stream headers" };
  46                 return;
  47         end
  48         session.version = tonumber(attr.version) or 0;
  49         session.streamid = uuid_generate();
  50         (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
  51
  52         if not hosts[session.host] then
  53                 -- We don't serve this host...
  54                 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
  55                 return;
  56         end
  57
  58         send("<?xml version='1.0'?>");
  59         send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' version='1.0' xml:lang='en'>", session.streamid, session.host));
  60
  61         (session.log or log)("debug", "Sent reply <stream:stream> to client");
  62         session.notopen = nil;
  63
  64         -- If session.secure is *false* (not nil) then it means we /were/ encrypting
  65         -- since we now have a new stream header, session is secured
  66         if session.secure == false then
  67                 session.secure = true;
  68         end
  69
  70         local features = st.stanza("stream:features");
  71         hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
  72         module:fire_event("stream-features", session, features);
  73
  74         send(features);
  75 end
  76
  77 function stream_callbacks.streamclosed(session)
  78         session.log("debug", "Received </stream:stream>");
  79         session:close();
  80 end
  81
  82 function stream_callbacks.error(session, error, data)
  83         if error == "no-stream" then
  84                 session.log("debug", "Invalid opening stream header");
  85                 session:close("invalid-namespace");
  86         elseif error == "parse-error" then
  87                 (session.log or log)("debug", "Client XML parse error: %s", tostring(data));
  88                 session:close("not-well-formed");
  89         elseif error == "stream-error" then
  90                 local condition, text = "undefined-condition";
  91                 for child in data:children() do
  92                         if child.attr.xmlns == xmlns_xmpp_streams then
  93                                 if child.name ~= "text" then
  94                                         condition = child.name;
  95                                 else
  96                                         text = child:get_text();
  97                                 end
  98                                 if condition ~= "undefined-condition" and text then
  99                                         break;
 100                                 end
 101                         end
 102                 end
 103                 text = condition .. (text and (" ("..text..")") or "");
 104                 session.log("info", "Session closed by remote with error: %s", text);
 105                 session:close(nil, text);
 106         end
 107 end
 108
 109 local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), traceback()); end
 110 function stream_callbacks.handlestanza(session, stanza)
 111         stanza = session.filter("stanzas/in", stanza);
 112         if stanza then
 113                 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
 114         end
 115 end
 116
 117 --- Session methods
 118 local function session_close(session, reason)
 119         local log = session.log or log;
 120         if session.conn then
 121                 if session.notopen then
 122                         session.send("<?xml version='1.0'?>");
 123                         session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
 124                 end
 125                 if reason then
 126                         if type(reason) == "string" then -- assume stream error
 127                                 log("info", "Disconnecting client, <stream:error> is: %s", reason);
 128                                 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
 129                         elseif type(reason) == "table" then
 130                                 if reason.condition then
 131                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 132                                         if reason.text then
 133                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 134                                         end
 135                                         if reason.extra then
 136                                                 stanza:add_child(reason.extra);
 137                                         end
 138                                         log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
 139                                         session.send(stanza);
 140                                 elseif reason.name then -- a stanza
 141                                         log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
 142                                         session.send(reason);
 143                                 end
 144                         end
 145                 end
 146                 session.send("</stream:stream>");
 147                 session.conn:close();
 148                 listener.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
 149         end
 150 end
 151
 152 --- Port listener
 153 function listener.onconnect(conn)
 154         local session = sm_new_session(conn);
 155         sessions[conn] = session;
 156
 157         session.log("info", "Client connected");
 158
 159         -- Client is using legacy SSL (otherwise mod_tls sets this flag)
 160         if conn:ssl() then
 161                 session.secure = true;
 162         end
 163
 164         if opt_keepalives then
 165                 conn:setoption("keepalive", opt_keepalives);
 166         end
 167
 168         session.close = session_close;
 169
 170         local stream = new_xmpp_stream(session, stream_callbacks);
 171         session.stream = stream;
 172         session.notopen = true;
 173
 174         function session.reset_stream()
 175                 session.notopen = true;
 176                 session.stream:reset();
 177         end
 178
 179         local filter = session.filter;
 180         function session.data(data)
 181                 data = filter("bytes/in", data);
 182                 if data then
 183                         local ok, err = stream:feed(data);
 184                         if ok then return; end
 185                         log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
 186                         session:close("not-well-formed");
 187                 end
 188         end
 189
 190
 191         if c2s_timeout then
 192                 add_task(c2s_timeout, function ()
 193                         if session.type == "c2s_unauthed" then
 194                                 session:close("connection-timeout");
 195                         end
 196                 end);
 197         end
 198
 199         session.dispatch_stanza = stream_callbacks.handlestanza;
 200 end
 201
 202 function listener.onincoming(conn, data)
 203         local session = sessions[conn];
 204         if session then
 205                 session.data(data);
 206         end
 207 end
 208
 209 function listener.ondisconnect(conn, err)
 210         local session = sessions[conn];
 211         if session then
 212                 (session.log or log)("info", "Client disconnected: %s", err);
 213                 sm_destroy_session(session, err);
 214                 sessions[conn]  = nil;
 215                 session = nil;
 216         end
 217 end
 218
 219 function listener.associate_session(conn, session)
 220         sessions[conn] = session;
 221 end
 222
 223 module:add_item("net-provider", {
 224         name = "c2s";
 225         listener = listener;
 226         default_port = 5222;
 227         encryption = "starttls";
 228         multiplex = {
 229                 pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:client%1.*>";
 230         };
 231 });
 232
 233 module:add_item("net-provider", {
 234         name = "legacy_ssl";
 235         listener = listener;
 236         encryption = "ssl";
 237         multiplex = {
 238                 pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:client%1.*>";
 239         };
 240 });
 241
 242