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 secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
  12 local secure_s2s_only = module:get_option("s2s_require_encryption");
  13
  14 local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
  15 local starttls_attr = { xmlns = xmlns_starttls };
  16 local starttls_proceed = st.stanza("proceed", starttls_attr);
  17 local starttls_failure = st.stanza("failure", starttls_attr);
  18 local c2s_feature = st.stanza("starttls", starttls_attr);
  19 local s2s_feature = st.stanza("starttls", starttls_attr);
  20 if secure_auth_only then c2s_feature:tag("required"):up(); end
  21 if secure_s2s_only then s2s_feature:tag("required"):up(); end
  22
  23 local global_ssl_ctx = prosody.global_ssl_ctx;
  24
  25 local host = hosts[module.host];
  26
  27 local function can_do_tls(session)
  28         if session.type == "c2s_unauthed" then
  29                 return session.conn.starttls and host.ssl_ctx_in;
  30         elseif session.type == "s2sin_unauthed" then
  31                 return session.conn.starttls and host.ssl_ctx_in;
  32         elseif session.direction == "outgoing" then
  33                 return session.conn.starttls and host.ssl_ctx;
  34         end
  35         return false;
  36 end
  37
  38 -- Hook <starttls/>
  39 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
  40         local origin = event.origin;
  41         if can_do_tls(origin) then
  42                 (origin.sends2s or origin.send)(starttls_proceed);
  43                 origin:reset_stream();
  44                 local host = origin.to_host or origin.host;
  45                 local ssl_ctx = host and hosts[host].ssl_ctx_in or global_ssl_ctx;
  46                 origin.conn:starttls(ssl_ctx);
  47                 origin.log("info", "TLS negotiation started for %s...", origin.type);
  48                 origin.secure = false;
  49         else
  50                 origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);
  51                 (origin.sends2s or origin.send)(starttls_failure);
  52                 origin:close();
  53         end
  54         return true;
  55 end);
  56
  57 -- Advertize stream feature
  58 module:hook("stream-features", function(event)
  59         local origin, features = event.origin, event.features;
  60         if can_do_tls(origin) then
  61                 features:add_child(c2s_feature);
  62         end
  63 end);
  64 module:hook("s2s-stream-features", function(event)
  65         local origin, features = event.origin, event.features;
  66         if can_do_tls(origin) then
  67                 features:add_child(s2s_feature);
  68         end
  69 end);
  70
  71 -- For s2sout connections, start TLS if we can
  72 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
  73         module:log("debug", "Received features element");
  74         if can_do_tls(session) and stanza:child_with_ns(xmlns_starttls) then
  75                 module:log("%s is offering TLS, taking up the offer...", session.to_host);
  76                 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
  77                 return true;
  78         end
  79 end, 500);
  80
  81 module:hook_stanza(xmlns_starttls, "proceed", function (session, stanza)
  82         module:log("debug", "Proceeding with TLS on s2sout...");
  83         session:reset_stream();
  84         local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;
  85         session.conn:starttls(ssl_ctx, true);
  86         session.secure = false;
  87         return true;
  88 end);