plugins/mod_tls.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 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 local starttls_attr = { xmlns = xmlns_starttls };
  20
  21 --- Client-to-server TLS handling
  22 module:add_handler("c2s_unauthed", "starttls", xmlns_starttls,
  23                 function (session, stanza)
  24                         if session.conn.starttls and host.ssl_ctx_in then
  25                                 session.send(st.stanza("proceed", starttls_attr));
  26                                 session:reset_stream();
  27                                 if session.host and hosts[session.host].ssl_ctx_in then
  28                                         session.conn.set_sslctx(hosts[session.host].ssl_ctx_in);
  29                                 end
  30                                 session.conn.starttls();
  31                                 session.log("info", "TLS negotiation started...");
  32                                 session.secure = false;
  33                         else
  34                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this connection");
  35                                 (session.sends2s or session.send)(st.stanza("failure", starttls_attr));
  36                                 session:close();
  37                         end
  38                 end);
  39
  40 module:add_event_hook("stream-features",
  41                 function (session, features)
  42                         if session.conn.starttls then
  43                                 features:tag("starttls", starttls_attr);
  44                                 if secure_auth_only then
  45                                         features:tag("required"):up():up();
  46                                 else
  47                                         features:up();
  48                                 end
  49                         end
  50                 end);
  51 ---
  52
  53 -- Stop here if the user doesn't want to allow s2s encryption
  54 if module:get_option("s2s_allow_encryption") == false then
  55         return;
  56 end
  57
  58 --- Server-to-server TLS handling
  59 module:add_handler("s2sin_unauthed", "starttls", xmlns_starttls,
  60                 function (session, stanza)
  61                         if session.conn.starttls and host.ssl_ctx_in then
  62                                 session.sends2s(st.stanza("proceed", starttls_attr));
  63                                 session:reset_stream();
  64                                 if session.to_host and hosts[session.to_host].ssl_ctx_in then
  65                                         session.conn.set_sslctx(hosts[session.to_host].ssl_ctx_in);
  66                                 end
  67                                 session.conn.starttls();
  68                                 session.log("info", "TLS negotiation started for incoming s2s...");
  69                                 session.secure = false;
  70                         else
  71                                 session.log("warn", "Attempt to start TLS, but TLS is not available on this s2s connection");
  72                                 (session.sends2s or session.send)(st.stanza("failure", starttls_attr));
  73                                 session:close();
  74                         end
  75                 end);
  76
  77
  78 module:hook("s2s-stream-features",
  79                 function (data)
  80                         local session, features = data.session, data.features;
  81                         if session.to_host and session.conn.starttls then
  82                                 features:tag("starttls", starttls_attr);
  83                                 if secure_s2s_only then
  84                                         features:tag("required"):up():up();
  85                                 else
  86                                         features:up();
  87                                 end
  88                         end
  89                 end);
  90
  91 -- For s2sout connections, start TLS if we can
  92 module:hook_stanza(xmlns_stream, "features",
  93                 function (session, stanza)
  94                         module:log("debug", "Received features element");
  95                         if session.conn.starttls and stanza:child_with_ns(xmlns_starttls) then
  96                                 module:log("%s is offering TLS, taking up the offer...", session.to_host);
  97                                 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
  98                                 return true;
  99                         end
 100                 end, 500);
 101
 102 module:hook_stanza(xmlns_starttls, "proceed",
 103                 function (session, stanza)
 104                         module:log("debug", "Proceeding with TLS on s2sout...");
 105                         local format, to_host, from_host = string.format, session.to_host, session.from_host;
 106                         local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;
 107                         session.conn.set_sslctx(ssl_ctx);
 108                         session:reset_stream();
 109                         session.conn.starttls(true);
 110                         session.secure = false;
 111                         return true;
 112                 end);