core/s2smanager.lua

   1
   2 local hosts = hosts;
   3 local sessions = sessions;
   4 local socket = require "socket";
   5 local format = string.format;
   6 local t_insert = table.insert;
   7 local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber
   8     = tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber;
   9
  10 local connlisteners_get = require "net.connlisteners".get;
  11 local wraptlsclient = require "net.server".wraptlsclient;
  12 local modulemanager = require "core.modulemanager";
  13
  14 local uuid_gen = require "util.uuid".generate;
  15
  16 local logger_init = require "util.logger".init;
  17
  18 local log = logger_init("s2smanager");
  19
  20 local md5_hash = require "util.hashes".md5;
  21
  22 local dialback_secret = "This is very secret!!! Ha!";
  23
  24 local srvmap = { ["gmail.com"] = "talk.google.com", ["identi.ca"] = "longlance.controlezvous.ca", ["cdr.se"] = "jabber.cdr.se" };
  25
  26 module "s2smanager"
  27
  28 function connect_host(from_host, to_host)
  29 end
  30
  31 function send_to_host(from_host, to_host, data)
  32         local host = hosts[to_host];
  33         if host then
  34                 -- Write to connection
  35                 if host.type == "s2sout_unauthed" and not host.notopen and not host.dialback_key then
  36                         log("debug", "trying to send over unauthed s2sout to "..to_host..", authing it now...");
  37                         initiate_dialback(host);
  38                         if not host.sendq then host.sendq = { data };
  39                         else t_insert(host.sendq, data); end
  40                 else
  41                         log("debug", "going to send stanza to "..to_host.." from "..from_host);
  42                         -- FIXME
  43                         if hosts[to_host].from_host ~= from_host then log("error", "WARNING! This might, possibly, be a bug, but it might not..."); end
  44                         hosts[to_host].sends2s(data);
  45                         log("debug", "stanza sent over "..hosts[to_host].type);
  46                 end
  47         else
  48                 log("debug", "opening a new outgoing connection for this stanza");
  49                 local host_session = new_outgoing(from_host, to_host);
  50                 -- Store in buffer
  51                 host_session.sendq = { data };
  52         end
  53 end
  54
  55 function disconnect_host(host)
  56
  57 end
  58
  59 local open_sessions = 0;
  60
  61 function new_incoming(conn)
  62         local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming" };
  63         if true then
  64                 session.trace = newproxy(true);
  65                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("s2s session got collected, now "..open_sessions.." s2s sessions are allocated") end;
  66         end
  67         open_sessions = open_sessions + 1;
  68         local w = conn.write;
  69         session.sends2s = function (t) w(tostring(t)); end
  70         return session;
  71 end
  72
  73 function new_outgoing(from_host, to_host)
  74                 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
  75                 hosts[to_host] = host_session;
  76                 local cl = connlisteners_get("xmppserver");
  77
  78                 local conn, handler = socket.tcp()
  79
  80
  81                 -- Register this outgoing connection so that xmppserver_listener knows about it
  82                 -- otherwise it will assume it is a new incoming connection
  83                 cl.register_outgoing(conn, host_session);
  84
  85                 --FIXME: Below parameters (ports/ip) are incorrect (use SRV)
  86                 to_host = srvmap[to_host] or to_host;
  87                 conn:settimeout(0.1);
  88                 conn:connect(to_host, 5269);
  89                 conn = wraptlsclient(cl, conn, to_host, 5269, 0, 1, hosts[from_host].ssl_ctx );
  90                 host_session.conn = conn;
  91
  92                 do
  93                         local conn_name = "s2sout"..tostring(conn):match("[a-f0-9]*$");
  94                         host_session.log = logger_init(conn_name);
  95                 end
  96
  97                 local w = conn.write;
  98                 host_session.sends2s = function (t) w(tostring(t)); end
  99
 100                 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));
 101
 102                 return host_session;
 103 end
 104
 105 function streamopened(session, attr)
 106         session.log("debug", "s2s stream opened");
 107         local send = session.sends2s;
 108
 109         session.version = tonumber(attr.version) or 0;
 110         if session.version >= 1.0 and not (attr.to and attr.from) then
 111                 print("to: "..tostring(attr.to).." from: "..tostring(attr.from));
 112                 --error(session.to_host.." failed to specify 'to' or 'from' hostname as per RFC");
 113                 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC");
 114         end
 115
 116         if session.direction == "incoming" then
 117                 -- Send a reply stream header
 118
 119                 for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end
 120
 121                 session.to_host = attr.to;
 122                 session.from_host = attr.from;
 123
 124                 session.streamid = uuid_gen();
 125                 print(session, session.from_host, "incoming s2s stream opened");
 126                 send("<?xml version='1.0'?>");
 127                 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));
 128         elseif session.direction == "outgoing" then
 129                 -- If we are just using the connection for verifying dialback keys, we won't try and auth it
 130                 if not attr.id then error("stream response did not give us a streamid!!!"); end
 131                 session.streamid = attr.id;
 132
 133                 if not session.dialback_verifying then
 134                         initiate_dialback(session);
 135                 else
 136                         mark_connected(session);
 137                 end
 138         end
 139         --[[
 140         local features = {};
 141         modulemanager.fire_event("stream-features-s2s", session, features);
 142
 143         send("<stream:features>");
 144
 145         for _, feature in ipairs(features) do
 146                 send(tostring(feature));
 147         end
 148
 149         send("</stream:features>");]]
 150         log("info", "s2s stream opened successfully");
 151         session.notopen = nil;
 152 end
 153
 154 function initiate_dialback(session)
 155         -- generate dialback key
 156         session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
 157         session.sends2s(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key));
 158         session.log("info", "sent dialback key on outgoing s2s stream");
 159 end
 160
 161 function generate_dialback(id, to, from)
 162         return md5_hash(id..to..from..dialback_secret); -- FIXME: See XEP-185 and XEP-220
 163 end
 164
 165 function verify_dialback(id, to, from, key)
 166         return key == generate_dialback(id, to, from);
 167 end
 168
 169 function make_authenticated(session)
 170         if session.type == "s2sout_unauthed" then
 171                 session.type = "s2sout";
 172         elseif session.type == "s2sin_unauthed" then
 173                 session.type = "s2sin";
 174         else
 175                 return false;
 176         end
 177         session.log("info", "connection is now authenticated");
 178
 179         mark_connected(session);
 180
 181         return true;
 182 end
 183
 184 function mark_connected(session)
 185         local sendq, send = session.sendq, session.sends2s;
 186
 187         local from, to = session.from_host, session.to_host;
 188
 189         session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete");
 190
 191         local send_to_host = send_to_host;
 192         function session.send(data) send_to_host(to, from, data); end
 193
 194
 195         if session.direction == "outgoing" then
 196                 if sendq then
 197                         session.log("debug", "sending queued stanzas across new outgoing connection to "..session.to_host);
 198                         for i, data in ipairs(sendq) do
 199                                 send(data);
 200                                 sendq[i] = nil;
 201                         end
 202                         session.sendq = nil;
 203                 end
 204         end
 205 end
 206
 207 function destroy_session(session)
 208         (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host));
 209         if session.direction == "outgoing" then
 210                 hosts[session.to_host] = nil;
 211         end
 212         session.conn = nil;
 213         session.disconnect = nil;
 214         for k in pairs(session) do
 215                 if k ~= "trace" then
 216                         session[k] = nil;
 217                 end
 218         end
 219 end
 220
 221 return _M;