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annotate mod_checkcerts/mod_checkcerts.lua @ 941:a6c2345bcf87

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