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