comparison mod_s2s_keysize_policy/mod_s2s_keysize_policy.lua @ 1203:5294c8c1861c

mod_s2s_keysize_policy: Don't trust keys weaker than 2048 bit RSA after 31 December 2013
author Kim Alvefur <zash@zash.se>
date Sun, 29 Sep 2013 19:10:39 +0200
parents
children fc42f8484451
comparison
equal deleted inserted replaced
1202:2cce28fe806b 1203:5294c8c1861c
1 -- mod_s2s_keysize_policy.lua
2
3 module:set_global();
4
5 local datetime_parse = require"util.datetime".parse;
6 local pat = "^([JFMAONSD][ceupao][glptbvyncr]) ?(%d%d?) (%d%d):(%d%d):(%d%d) (%d%d%d%d) GMT$";
7 local months = {Jan=1,Feb=2,Mar=3,Apr=4,May=5,Jun=6,Jul=7,Aug=8,Sep=9,Oct=10,Nov=11,Dec=12};
8 local function parse_x509_datetime(s)
9 local month, day, hour, min, sec, year = s:match(pat); month = months[month];
10 return datetime_parse(("%04d-%02d-%02dT%02d:%02d:%02dZ"):format(year, month, day, hour, min, sec));
11 end
12
13 local weak_key_cutoff = datetime_parse("2014-01-01T00:00:00Z");
14
15 -- From RFC 4492
16 local weak_key_size = {
17 RSA = 2048,
18 DSA = 2048,
19 DH = 2048,
20 EC = 233,
21 }
22
23 module:hook("s2s-check-certificate", function(event)
24 local host, session, cert = event.host, event.session, event.cert;
25 if cert and cert.pubkey then
26 local _, key_type, key_size = cert:pubkey();
27 if key_size < ( weak_key_size[key_type] or 0 ) then
28 local issued = parse_x509_datetime(cert:notbefore());
29 if issued > weak_key_cutoff then
30 session.log("error", "%s has a %s-bit %s key issued after 31 December 2013, invalidating trust!", host, key_size, key_type);
31 session.cert_chain_status = "invalid";
32 session.cert_identity_status = "invalid";
33 else
34 session.log("warn", "%s has a %s-bit %s key", host, key_size, key_type);
35 end
36 else
37 session.log("info", "%s has a %s-bit %s key", host, key_size, key_type);
38 end
39 end
40 end);