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