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 c2s_starttls_handler(session, stanza)
  20         if session.conn.starttls then
  21                 session.send(st.stanza("proceed", { xmlns = xmlns_starttls }));
  22                 session:reset_stream();
  23                 local ssl_ctx = session.host and hosts[session.host].ssl_ctx_in or global_ssl_ctx;
  24                 session.conn:starttls(ssl_ctx);
  25                 session.log("info", "TLS negotiation started...");
  26                 session.secure = false;
  27         else
  28                 -- FIXME: What reply?
  29                 session.log("warn", "Attempt to start TLS, but TLS is not available on this connection");
  30         end
  31 end
  32
  33 function s2s_starttls_handler(session, stanza)
  34         if session.conn.starttls then
  35                 session.sends2s(st.stanza("proceed", { xmlns = xmlns_starttls }));
  36                 session:reset_stream();
  37                 local ssl_ctx = session.to_host and hosts[session.to_host].ssl_ctx_in or global_ssl_ctx;
  38                 session.conn:starttls(ssl_ctx);
  39                 session.log("info", "TLS negotiation started for incoming s2s...");
  40                 session.secure = false;
  41         else
  42                 -- FIXME: What reply?
  43                 session.log("warn", "Attempt to start TLS, but TLS is not available on this s2s connection");
  44         end
  45 end
  46
  47 module:add_handler("c2s_unauthed", "starttls", xmlns_starttls, c2s_starttls_handler);
  48 module:add_handler("s2sin_unauthed", "starttls", xmlns_starttls, s2s_starttls_handler);
  49
  50
  51 local starttls_attr = { xmlns = xmlns_starttls };
  52 module:add_event_hook("stream-features",
  53                 function (session, features)
  54                         if not session.username and session.conn.starttls then
  55                                 features:tag("starttls", starttls_attr);
  56                                 if secure_auth_only then
  57                                         features:tag("required"):up():up();
  58                                 else
  59                                         features:up();
  60                                 end
  61                         end
  62                 end);
  63
  64 module:hook("s2s-stream-features",
  65                 function (data)
  66                         local session, features = data.session, data.features;
  67                         if session.to_host and session.type ~= "s2sin" and session.conn.starttls then
  68                                 features:tag("starttls", starttls_attr):up();
  69                                 if secure_s2s_only then
  70                                         features:tag("required"):up():up();
  71                                 else
  72                                         features:up();
  73                                 end
  74                         end
  75                 end);
  76
  77 -- For s2sout connections, start TLS if we can
  78 module:hook_stanza(xmlns_stream, "features",
  79                 function (session, stanza)
  80                         module:log("debug", "Received features element");
  81                         if session.conn.starttls and stanza:child_with_ns(xmlns_starttls) then
  82                                 module:log("%s is offering TLS, taking up the offer...", session.to_host);
  83                                 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
  84                                 return true;
  85                         end
  86                 end, 500);
  87
  88 module:hook_stanza(xmlns_starttls, "proceed",
  89                 function (session, stanza)
  90                         module:log("debug", "Proceeding with TLS on s2sout...");
  91                         session:reset_stream();
  92                         local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;
  93                         session.conn:starttls(ssl_ctx, true);
  94                         session.secure = false;
  95                         return true;
  96                 end);