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