mod_tls: Fixed traceback during S2S TLS (nil global access).
[prosody.git] / 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 secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
12 local secure_s2s_only = module:get_option("s2s_require_encryption");
13
14 local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
15 local starttls_attr = { xmlns = xmlns_starttls };
16 local starttls_proceed = st.stanza("proceed", starttls_attr);
17 local starttls_failure = st.stanza("failure", starttls_attr);
18 local c2s_feature = st.stanza("starttls", starttls_attr);
19 local s2s_feature = st.stanza("starttls", starttls_attr);
20 if secure_auth_only then c2s_feature:tag("required"):up(); end
21 if secure_s2s_only then s2s_feature:tag("required"):up(); end
22
23 local global_ssl_ctx = prosody.global_ssl_ctx;
24
25 local host = hosts[module.host];
26
27 local function can_do_tls(session)
28         if session.type == "c2s_unauthed" then
29                 return session.username and session.conn.starttls and host.ssl_ctx_in;
30         elseif session.type == "s2sin_unauthed" then
31                 return session.to_host and session.conn.starttls and host.ssl_ctx_in;
32         end
33         return false;
34 end
35
36 -- Hook <starttls/>
37 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
38         local origin = event.origin;
39         if can_do_tls(origin) then
40                 (origin.sends2s or origin.send)(starttls_proceed);
41                 origin:reset_stream();
42                 local host = origin.to_host or origin.host;
43                 local ssl_ctx = host and hosts[host].ssl_ctx_in or global_ssl_ctx;
44                 origin.conn:starttls(ssl_ctx);
45                 origin.log("info", "TLS negotiation started for %s...", origin.type);
46                 origin.secure = false;
47         else
48                 origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);
49                 (origin.sends2s or origin.send)(starttls_failure);
50                 origin:close();
51         end
52         return true;
53 end);
54
55 -- Advertize stream feature
56 module:hook("stream-features", function(event)
57         local origin, features = event.origin, event.features;
58         if can_do_tls(origin) then
59                 features:add_child(c2s_feature);
60         end
61 end);
62 module:hook("s2s-stream-features", function(event)
63         local origin, features = event.origin, event.features;
64         if can_do_tls(origin) then
65                 features:add_child(s2s_feature);
66         end
67 end);
68
69 -- For s2sout connections, start TLS if we can
70 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
71         module:log("debug", "Received features element");
72         if session.conn.starttls and stanza:child_with_ns(xmlns_starttls) then
73                 module:log("%s is offering TLS, taking up the offer...", session.to_host);
74                 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
75                 return true;
76         end
77 end, 500);
78
79 module:hook_stanza(xmlns_starttls, "proceed", function (session, stanza)
80         module:log("debug", "Proceeding with TLS on s2sout...");
81         session:reset_stream();
82         local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;
83         session.conn:starttls(ssl_ctx, true);
84         session.secure = false;
85         return true;
86 end);