annotate mod_checkcerts/mod_checkcerts.lua @ 941:a6c2345bcf87

mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
author Kim Alvefur <zash@zash.se>
date Thu, 28 Mar 2013 03:38:02 +0100
parents 1983d4d51e1a
children a8203db13ca2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
1 local ssl = require"ssl";
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
2 local load_cert = ssl.x509 and ssl.x509.load
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
3 or ssl.cert_from_pem; -- COMPAT mw/luasec-hg
941
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
4 local st = require"util.stanza"
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
5
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
6 if not load_cert then
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
7 module:log("error", "This version of LuaSec (%s) does not support certificate checking", ssl._VERSION);
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
8 return
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
9 end
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
10
941
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
11 local last_check = 0;
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
12
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
13 local function check_certs_validity()
941
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
14 local now = os.time();
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
15
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
16 if last_check > now - 21600 then
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
17 return
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
18 else
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
19 last_check = now;
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
20 end
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
21 -- First, let's find out what certificate this host uses.
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
22 local ssl_config = config.rawget(module.host, "core", "ssl");
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
23 if not ssl_config then
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
24 local base_host = module.host:match("%.(.*)");
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
25 ssl_config = config.get(base_host, "core", "ssl");
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
26 end
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
27
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
28 if ssl_config.certificate then
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
29 local certfile = ssl_config.certificate;
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
30 local cert;
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
31
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
32 local fh = io.open(certfile); -- Load the file.
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
33 cert = fh and fh:read"*a";
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
34 fh:close();
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
35 cert = cert and load_cert(cert); -- And parse
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
36 if not cert then return end
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
37 -- No error reporting, certmanager should complain already
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
38
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
39 local valid_at = cert.valid_at or cert.validat;
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
40 if not valid_at then return end -- Broken or uncommon LuaSec version?
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
41
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
42 -- This might be wrong if the certificate has NotBefore in the future.
941
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
43 -- However this is unlikely to happen with CA-issued certs in the wild.
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
44 if not valid_at(cert, now) then
941
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
45 module:log("error", "The certificate %s has expired", certfile);
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
46 module:send(st.message({from=module.host,to=admin,type="chat"},("Certificate for host %s has expired!"):format(module.host)));
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
47 elseif not valid_at(cert, now+86400*7) then
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
48 module:log("warn", "The certificate %s will expire this week", certfile);
941
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
49 for _,admin in ipairs(module:get_option_array("admins", {})) do
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
50 module:send(st.message({from=module.host,to=admin,type="chat"},("Certificate for host %s is about to expire!"):format(module.host)));
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
51 end
855
1983d4d51e1a mod_checkcerts: Improve, add comments, add forward compatibility.
Kim Alvefur <zash@zash.se>
parents: 667
diff changeset
52 elseif not valid_at(cert, now+86400*30) then
941
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
53 module:log("warn", "The certificate %s will expire later this month", certfile);
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
54 else
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
55 module:log("info", "The certificate %s is valid until %s", certfile, cert.notafter and cert:notafter() or "later");
667
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
56 end
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
57 end
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
58 end
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
59
ea9941812721 mod_checkcerts: New module that logs a warning when your cert is about to expire.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
60 module:hook_global("config-reloaded", check_certs_validity);
941
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
61 module:add_timer(1, function()
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
62 check_certs_validity();
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
63 return math.random(14400, 86400);
a6c2345bcf87 mod_checkcerts: Nag admins about certs that have, or are about to expire. Often.
Kim Alvefur <zash@zash.se>
parents: 855
diff changeset
64 end);