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 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                                 if session.host and hosts[session.host].ssl_ctx_in then
  23                                         session.conn.set_sslctx(hosts[session.host].ssl_ctx_in);
  24                                 end
  25                                 session.conn.starttls();
  26                                 session.log("info", "TLS negotiation started...");
  27                                 session.secure = false;
  28                         else
  29                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this connection");
  30                                 (session.sends2s or session.send)(st.stanza("failure", { xmlns = xmlns_starttls }));
  31                                 session:close();
  32                         end
  33                 end);
  34
  35 module:add_handler("s2sin_unauthed", "starttls", xmlns_starttls,
  36                 function (session, stanza)
  37                         if session.conn.starttls then
  38                                 session.sends2s(st.stanza("proceed", { xmlns = xmlns_starttls }));
  39                                 session:reset_stream();
  40                                 if session.to_host and hosts[session.to_host].ssl_ctx_in then
  41                                         session.conn.set_sslctx(hosts[session.to_host].ssl_ctx_in);
  42                                 end
  43                                 session.conn.starttls();
  44                                 session.log("info", "TLS negotiation started for incoming s2s...");
  45                                 session.secure = false;
  46                         else
  47                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this s2s connection");
  48                                 (session.sends2s or session.send)(st.stanza("failure", { xmlns = xmlns_starttls }));
  49                                 session:close();
  50                         end
  51                 end);
  52
  53
  54 local starttls_attr = { xmlns = xmlns_starttls };
  55 module:add_event_hook("stream-features",
  56                 function (session, features)
  57                         if session.conn.starttls then
  58                                 features:tag("starttls", starttls_attr);
  59                                 if secure_auth_only then
  60                                         features:tag("required"):up():up();
  61                                 else
  62                                         features:up();
  63                                 end
  64                         end
  65                 end);
  66
  67 module:hook("s2s-stream-features",
  68                 function (data)
  69                         local session, features = data.session, data.features;
  70                         if session.to_host and session.conn.starttls then
  71                                 features:tag("starttls", starttls_attr);
  72                                 if secure_s2s_only then
  73                                         features:tag("required"):up():up();
  74                                 else
  75                                         features:up();
  76                                 end
  77                         end
  78                 end);
  79
  80 -- For s2sout connections, start TLS if we can
  81 module:hook_stanza(xmlns_stream, "features",
  82                 function (session, stanza)
  83                         module:log("debug", "Received features element");
  84                         if session.conn.starttls and stanza:child_with_ns(xmlns_starttls) then
  85                                 module:log("%s is offering TLS, taking up the offer...", session.to_host);
  86                                 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
  87                                 return true;
  88                         end
  89                 end, 500);
  90
  91 module:hook_stanza(xmlns_starttls, "proceed",
  92                 function (session, stanza)
  93                         module:log("debug", "Proceeding with TLS on s2sout...");
  94                         local format, to_host, from_host = string.format, session.to_host, session.from_host;
  95                         session:reset_stream();
  96                         session.conn.starttls(true);
  97                         session.secure = false;
  98                         return true;
  99                 end);