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