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("c2s_require_encryption") or module:get_option("require_encryption");
  15 local secure_s2s_only = module:get_option("require_s2s_encryption");
  16
  17 module:add_handler("c2s_unauthed", "starttls", xmlns_starttls,
  18                 function (session, stanza)
  19                         if session.conn.starttls then
  20                                 session.send(st.stanza("proceed", { xmlns = xmlns_starttls }));
  21                                 session:reset_stream();
  22                                 session.conn.starttls();
  23                                 session.log("info", "TLS negotiation started...");
  24                                 session.secure = false;
  25                         else
  26                                 -- FIXME: What reply?
  27                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this connection");
  28                         end
  29                 end);
  30
  31 module:add_handler("s2sin_unauthed", "starttls", xmlns_starttls,
  32                 function (session, stanza)
  33                         if session.conn.starttls then
  34                                 session.sends2s(st.stanza("proceed", { xmlns = xmlns_starttls }));
  35                                 session:reset_stream();
  36                                 session.conn.starttls();
  37                                 session.log("info", "TLS negotiation started for incoming s2s...");
  38                                 session.secure = false;
  39                         else
  40                                 -- FIXME: What reply?
  41                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this s2s connection");
  42                         end
  43                 end);
  44
  45
  46 local starttls_attr = { xmlns = xmlns_starttls };
  47 module:add_event_hook("stream-features",
  48                 function (session, features)
  49                         if session.conn.starttls then
  50                                 features:tag("starttls", starttls_attr);
  51                                 if secure_auth_only then
  52                                         features:tag("required"):up():up();
  53                                 else
  54                                         features:up();
  55                                 end
  56                         end
  57                 end);
  58
  59 module:add_event_hook("s2s-stream-features",
  60                 function (session, features)
  61                         -- This hook is possibly called once per host (at least if the
  62                         -- remote server does not specify a to/from.
  63                         if session.to_host and session.conn.starttls and not features:child_with_ns(xmlns_starttls) then
  64                                 features:tag("starttls", starttls_attr):up();
  65                                 if secure_s2s_only then
  66                                         features:tag("required"):up():up();
  67                                 else
  68                                         features:up();
  69                                 end
  70                         end
  71                 end);
  72
  73 -- For s2sout connections, start TLS if we can
  74 module:hook_stanza(xmlns_stream, "features",
  75                 function (session, stanza)
  76                         module:log("debug", "Received features element");
  77                         if stanza:child_with_ns(xmlns_starttls) then
  78                                 module:log("%s is offering TLS, taking up the offer...", session.to_host);
  79                                 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
  80                                 return true;
  81                         end
  82                 end, 500);
  83
  84 module:hook_stanza(xmlns_starttls, "proceed",
  85                 function (session, stanza)
  86                         module:log("debug", "Proceeding with TLS on s2sout...");
  87                         local format, to_host, from_host = string.format, session.to_host, session.from_host;
  88                         session:reset_stream();
  89                         session.conn.starttls(true);
  90                         return true;
  91                 end);