core/s2smanager.lua

   1
   2 local hosts = hosts;
   3 local sessions = sessions;
   4 local socket = require "socket";
   5 local format = string.format;
   6 local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber
   7     = tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber;
   8
   9 local connlisteners_get = require "net.connlisteners".get;
  10 local wraptlsclient = require "net.server".wraptlsclient;
  11 local modulemanager = require "core.modulemanager";
  12
  13 local uuid_gen = require "util.uuid".generate;
  14
  15 local logger_init = require "util.logger".init;
  16
  17 local log = logger_init("s2smanager");
  18
  19 local md5_hash = require "util.hashes".md5;
  20
  21 local dialback_secret = "This is very secret!!! Ha!";
  22
  23 local srvmap = { ["gmail.com"] = "talk.google.com", ["identi.ca"] = "longlance.controlezvous.ca" };
  24
  25 module "s2smanager"
  26
  27 function connect_host(from_host, to_host)
  28 end
  29
  30 function send_to_host(from_host, to_host, data)
  31         if hosts[to_host] then
  32                 -- Write to connection
  33                 hosts[to_host].send(data);
  34                 log("debug", "stanza sent over s2s");
  35         else
  36                 log("debug", "opening a new outgoing connection for this stanza");
  37                 local host_session = new_outgoing(from_host, to_host);
  38                 -- Store in buffer
  39                 host_session.sendq = { data };
  40         end
  41 end
  42
  43 function disconnect_host(host)
  44
  45 end
  46
  47 local open_sessions = 0;
  48
  49 function new_incoming(conn)
  50         local session = { conn = conn,  priority = 0, type = "s2sin_unauthed", direction = "incoming" };
  51         if true then
  52                 session.trace = newproxy(true);
  53                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("s2s session got collected, now "..open_sessions.." s2s sessions are allocated") end;
  54         end
  55         open_sessions = open_sessions + 1;
  56         local w = conn.write;
  57         session.send = function (t) w(tostring(t)); end
  58         return session;
  59 end
  60
  61 function new_outgoing(from_host, to_host)
  62                 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
  63                 hosts[to_host] = host_session;
  64
  65                 local cl = connlisteners_get("xmppserver");
  66
  67                 local conn, handler = socket.tcp()
  68                 --FIXME: Below parameters (ports/ip) are incorrect (use SRV)
  69                 to_host = srvmap[to_host] or to_host;
  70                 conn:connect(to_host, 5269);
  71                 conn = wraptlsclient(cl, conn, to_host, 5269, 0, 1, hosts[from_host].ssl_ctx );
  72                 host_session.conn = conn;
  73
  74                 -- Register this outgoing connection so that xmppserver_listener knows about it
  75                 -- otherwise it will assume it is a new incoming connection
  76                 cl.register_outgoing(conn, host_session);
  77
  78                 do
  79                         local conn_name = "s2sout"..tostring(conn):match("[a-f0-9]*$");
  80                         host_session.log = logger_init(conn_name);
  81                 end
  82
  83                 local w = conn.write;
  84                 host_session.send = function (t) w(tostring(t)); end
  85
  86                 conn.write(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0'>]], from_host, to_host));
  87
  88                 return host_session;
  89 end
  90
  91 function streamopened(session, attr)
  92         session.log("debug", "s2s stream opened");
  93         local send = session.send;
  94
  95         session.version = tonumber(attr.version) or 0;
  96         if session.version >= 1.0 and not (attr.to and attr.from) then
  97                 print("to: "..tostring(attr.to).." from: "..tostring(attr.from));
  98                 --error(session.to_host.." failed to specify 'to' or 'from' hostname as per RFC");
  99                 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC");
 100         end
 101
 102         if session.direction == "incoming" then
 103                 -- Send a reply stream header
 104
 105                 for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end
 106
 107                 session.to_host = attr.to;
 108                 session.from_host = attr.from;
 109
 110                 session.streamid = uuid_gen();
 111                 print(session, session.from_host, "incoming s2s stream opened");
 112                 send("<?xml version='1.0'?>");
 113                 send(format("<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s'>", session.streamid, session.to_host));
 114         elseif session.direction == "outgoing" then
 115                 -- If we are just using the connection for verifying dialback keys, we won't try and auth it
 116                 if not session.dialback_verifying then
 117                         -- generate dialback key
 118                         if not attr.id then error("stream response did not give us a streamid!!!"); end
 119                         session.streamid = attr.id;
 120                         session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
 121                         session.send(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key));
 122                         session.log("info", "sent dialback key on outgoing s2s stream");
 123                 else
 124                         mark_connected(session);
 125                 end
 126         end
 127         --[[
 128         local features = {};
 129         modulemanager.fire_event("stream-features-s2s", session, features);
 130
 131         send("<stream:features>");
 132
 133         for _, feature in ipairs(features) do
 134                 send(tostring(feature));
 135         end
 136
 137         send("</stream:features>");]]
 138         log("info", "s2s stream opened successfully");
 139         session.notopen = nil;
 140 end
 141
 142 function generate_dialback(id, to, from)
 143         return md5_hash(id..to..from..dialback_secret); -- FIXME: See XEP-185 and XEP-220
 144 end
 145
 146 function verify_dialback(id, to, from, key)
 147         return key == generate_dialback(id, to, from);
 148 end
 149
 150 function make_authenticated(session)
 151         if session.type == "s2sout_unauthed" then
 152                 session.type = "s2sout";
 153         elseif session.type == "s2sin_unauthed" then
 154                 session.type = "s2sin";
 155         else
 156                 return false;
 157         end
 158         session.log("info", "connection is now authenticated");
 159
 160         mark_connected(session);
 161
 162         return true;
 163 end
 164
 165 function mark_connected(session)
 166         local sendq, send = session.sendq, session.send;
 167         if sendq then
 168                 session.log("debug", "sending queued stanzas across new connection");
 169                 for i, data in ipairs(sendq) do
 170                         send(data);
 171                         sendq[i] = nil;
 172                 end
 173                 session.sendq = nil;
 174         end
 175 end
 176
 177 function destroy_session(session)
 178         (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host));
 179         if session.direction == "outgoing" then
 180                 hosts[session.to_host] = nil;
 181         end
 182         session.conn = nil;
 183         session.disconnect = nil;
 184         for k in pairs(session) do
 185                 if k ~= "trace" then
 186                         session[k] = nil;
 187                 end
 188         end
 189 end
 190
 191 return _M;