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("s2s_require_encryption");
  16
  17 local global_ssl_ctx = prosody.global_ssl_ctx;
  18
  19 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
  20         local origin = event.origin;
  21         if origin.conn.starttls and origin.type == "c2s_unauthed" or origin.type == "s2sin_unauthed" then
  22                 (origin.sends2s or origin.send)(st.stanza("proceed", { xmlns = xmlns_starttls }));
  23                 origin:reset_stream();
  24                 local host = origin.to_host or origin.host;
  25                 local ssl_ctx = host and hosts[host].ssl_ctx_in or global_ssl_ctx;
  26                 origin.conn:starttls(ssl_ctx);
  27                 origin.log("info", "TLS negotiation started for %s...", origin.type);
  28                 origin.secure = false;
  29         else
  30                 -- FIXME: What reply?
  31                 origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);
  32         end
  33         return true;
  34 end);
  35
  36
  37 local starttls_attr = { xmlns = xmlns_starttls };
  38 module:add_event_hook("stream-features",
  39                 function (session, features)
  40                         if not session.username and session.conn.starttls then
  41                                 features:tag("starttls", starttls_attr);
  42                                 if secure_auth_only then
  43                                         features:tag("required"):up():up();
  44                                 else
  45                                         features:up();
  46                                 end
  47                         end
  48                 end);
  49
  50 module:hook("s2s-stream-features",
  51                 function (data)
  52                         local session, features = data.session, data.features;
  53                         if session.to_host and session.type ~= "s2sin" and session.conn.starttls then
  54                                 features:tag("starttls", starttls_attr):up();
  55                                 if secure_s2s_only then
  56                                         features:tag("required"):up():up();
  57                                 else
  58                                         features:up();
  59                                 end
  60                         end
  61                 end);
  62
  63 -- For s2sout connections, start TLS if we can
  64 module:hook_stanza(xmlns_stream, "features",
  65                 function (session, stanza)
  66                         module:log("debug", "Received features element");
  67                         if session.conn.starttls and stanza:child_with_ns(xmlns_starttls) then
  68                                 module:log("%s is offering TLS, taking up the offer...", session.to_host);
  69                                 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
  70                                 return true;
  71                         end
  72                 end, 500);
  73
  74 module:hook_stanza(xmlns_starttls, "proceed",
  75                 function (session, stanza)
  76                         module:log("debug", "Proceeding with TLS on s2sout...");
  77                         session:reset_stream();
  78                         local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;
  79                         session.conn:starttls(ssl_ctx, true);
  80                         session.secure = false;
  81                         return true;
  82                 end);