plugins/mod_tls.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 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 local st = require "util.stanza";
  10
  11 local xmlns_stream = 'http://etherx.jabber.org/streams';
  12 local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
  13
  14 local secure_auth_only = module:get_option("require_encryption");
  15
  16 module:add_handler("c2s_unauthed", "starttls", xmlns_starttls,
  17                 function (session, stanza)
  18                         if session.conn.starttls then
  19                                 session.send(st.stanza("proceed", { xmlns = xmlns_starttls }));
  20                                 session:reset_stream();
  21                                 session.conn.starttls();
  22                                 session.log("info", "TLS negotiation started...");
  23                                 session.secure = false;
  24                         else
  25                                 -- FIXME: What reply?
  26                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this connection");
  27                         end
  28                 end);
  29
  30 module:add_handler("s2sin_unauthed", "starttls", xmlns_starttls,
  31                 function (session, stanza)
  32                         if session.conn.starttls then
  33                                 session.sends2s(st.stanza("proceed", { xmlns = xmlns_starttls }));
  34                                 session:reset_stream();
  35                                 session.conn.starttls();
  36                                 session.log("info", "TLS negotiation started for incoming s2s...");
  37                         else
  38                                 -- FIXME: What reply?
  39                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this s2s connection");
  40                         end
  41                 end);
  42
  43
  44 local starttls_attr = { xmlns = xmlns_starttls };
  45 module:add_event_hook("stream-features",
  46                 function (session, features)
  47                         if session.conn.starttls then
  48                                 features:tag("starttls", starttls_attr);
  49                                 if secure_auth_only then
  50                                         features:tag("required"):up():up();
  51                                 else
  52                                         features:up();
  53                                 end
  54                         end
  55                 end);
  56
  57 module:add_event_hook("s2s-stream-features",
  58                 function (session, features)
  59                         -- This hook is possibly called once per host (at least if the
  60                         -- remote server does not specify a to/from.
  61                         if session.conn.starttls and not features:child_with_ns(xmlns_starttls) then
  62                                 features:tag("starttls", starttls_attr);
  63                                 -- TODO: Make this optional :P
  64                                 --features:tag("required"):up():up();
  65                         end
  66                 end);
  67
  68 -- For s2sout connections, start TLS if we can
  69 module:hook_stanza(xmlns_stream, "features",
  70                 function (session, stanza)
  71                         module:log("debug", "Received features element");
  72                         if stanza:child_with_ns(xmlns_starttls) then
  73                                 module:log("%s is offering TLS, taking up the offer...", session.to_host);
  74                                 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
  75                                 return true;
  76                         end
  77                 end, 500);
  78
  79 module:hook_stanza(xmlns_starttls, "proceed",
  80                 function (session, stanza)
  81                         module:log("debug", "Proceeding with TLS on s2sout...");
  82                         local format, to_host, from_host = string.format, session.to_host, session.from_host;
  83                         session:reset_stream();
  84                         session.conn.starttls(true);
  85                         return true;
  86                 end);