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 host = hosts[module.host];
  18
  19 module:add_handler("c2s_unauthed", "starttls", xmlns_starttls,
  20                 function (session, stanza)
  21                         if session.conn.starttls and host.ssl_ctx_in then
  22                                 session.send(st.stanza("proceed", { xmlns = xmlns_starttls }));
  23                                 session:reset_stream();
  24                                 if session.host and hosts[session.host].ssl_ctx_in then
  25                                         session.conn.set_sslctx(hosts[session.host].ssl_ctx_in);
  26                                 end
  27                                 session.conn.starttls();
  28                                 session.log("info", "TLS negotiation started...");
  29                                 session.secure = false;
  30                         else
  31                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this connection");
  32                                 (session.sends2s or session.send)(st.stanza("failure", { xmlns = xmlns_starttls }));
  33                                 session:close();
  34                         end
  35                 end);
  36
  37 module:add_handler("s2sin_unauthed", "starttls", xmlns_starttls,
  38                 function (session, stanza)
  39                         if session.conn.starttls and host.ssl_ctx_in then
  40                                 session.sends2s(st.stanza("proceed", { xmlns = xmlns_starttls }));
  41                                 session:reset_stream();
  42                                 if session.to_host and hosts[session.to_host].ssl_ctx_in then
  43                                         session.conn.set_sslctx(hosts[session.to_host].ssl_ctx_in);
  44                                 end
  45                                 session.conn.starttls();
  46                                 session.log("info", "TLS negotiation started for incoming s2s...");
  47                                 session.secure = false;
  48                         else
  49                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this s2s connection");
  50                                 (session.sends2s or session.send)(st.stanza("failure", { xmlns = xmlns_starttls }));
  51                                 session:close();
  52                         end
  53                 end);
  54
  55
  56 local starttls_attr = { xmlns = xmlns_starttls };
  57 module:add_event_hook("stream-features",
  58                 function (session, features)
  59                         if session.conn.starttls then
  60                                 features:tag("starttls", starttls_attr);
  61                                 if secure_auth_only then
  62                                         features:tag("required"):up():up();
  63                                 else
  64                                         features:up();
  65                                 end
  66                         end
  67                 end);
  68
  69 module:hook("s2s-stream-features",
  70                 function (data)
  71                         local session, features = data.session, data.features;
  72                         if session.to_host and session.conn.starttls then
  73                                 features:tag("starttls", starttls_attr);
  74                                 if secure_s2s_only then
  75                                         features:tag("required"):up():up();
  76                                 else
  77                                         features:up();
  78                                 end
  79                         end
  80                 end);
  81
  82 -- For s2sout connections, start TLS if we can
  83 module:hook_stanza(xmlns_stream, "features",
  84                 function (session, stanza)
  85                         module:log("debug", "Received features element");
  86                         if session.conn.starttls and stanza:child_with_ns(xmlns_starttls) then
  87                                 module:log("%s is offering TLS, taking up the offer...", session.to_host);
  88                                 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
  89                                 return true;
  90                         end
  91                 end, 500);
  92
  93 module:hook_stanza(xmlns_starttls, "proceed",
  94                 function (session, stanza)
  95                         module:log("debug", "Proceeding with TLS on s2sout...");
  96                         local format, to_host, from_host = string.format, session.to_host, session.from_host;
  97                         local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;
  98                         session.conn.set_sslctx(ssl_ctx);
  99                         session:reset_stream();
 100                         session.conn.starttls(true);
 101                         session.secure = false;
 102                         return true;
 103                 end);