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annotate mod_checkcerts/mod_checkcerts.lua @ 1879:18123e0f5d58

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mod_checkcerts: Improve logic for finding an ssl section with a certificate
author Kim Alvefur <zash@zash.se>
date Tue, 29 Sep 2015 14:53:16 +0200
parents d9fcf9d8e787
children a7c1f1b6ef05
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1 local ssl = require"ssl";
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2 local datetime_parse = require"util.datetime".parse;
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3 local load_cert = ssl.loadcertificate;
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4 local st = require"util.stanza"
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5
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6 -- These are in days.
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7 local nag_time = module:get_option_number("checkcerts_notify", 7) * 86400;
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8
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9 if not load_cert then
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10 module:log("error", "This version of LuaSec (%s) does not support certificate checking", ssl._VERSION);
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11 return
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12 end
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13
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14 local pat = "^([JFMAONSD][ceupao][glptbvyncr]) ?(%d%d?) (%d%d):(%d%d):(%d%d) (%d%d%d%d) GMT$";
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15 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};
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16 local function parse_x509_datetime(s)
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17 local month, day, hour, min, sec, year = s:match(pat); month = months[month];
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18 return datetime_parse(("%04d-%02d-%02dT%02d:%02d:%02dZ"):format(year, month, day, hour, min, sec));
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19 end
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21 local timeunits = {"minute",60,"hour",3600,"day",86400,"week",604800,"month",2629746,"year",31556952,};
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22 local function humantime(timediff)
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23 local ret = {};
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24 for i=#timeunits,2,-2 do
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25 if timeunits[i] < timediff then
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26 local n = math.floor(timediff / timeunits[i]);
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27 if n > 0 and #ret < 2 then
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28 ret[#ret+1] = ("%d %s%s"):format(n, timeunits[i-1], n ~= 1 and "s" or "");
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29 timediff = timediff - n*timeunits[i];
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30 end
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31 end
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32 end
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33 return table.concat(ret, " and ")
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34 end
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35
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36 local function check_certs_validity()
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37 local now = os.time();
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38
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39 -- First, let's find out what certificate this host uses.
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40 local ssl_config = config.rawget(module.host, "ssl");
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41 if not ssl_config or not ssl_config.certificate then
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42 ssl_config = config.get(module.host:match("%.(.*)"), "ssl");
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43 end
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44 if not ssl_config or not ssl_config.certificate then
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45 ssl_config = config.get("*", "ssl");
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46 end
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47 if not ssl_config or not ssl_config.certificate then
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48 log("warn", "Could not find a certificate to check");
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49 return;
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50 end
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51
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52 local certfile = ssl_config.certificate;
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53 local fh = io.open(certfile); -- Load the file.
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54 cert = fh and fh:read"*a";
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55 fh = fh and fh:close();
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56 local cert = cert and load_cert(cert); -- And parse
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57
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58 if not cert then
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59 module:log("warn", "No certificate configured for this host, please fix this and reload this module to check expiry");
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60 return
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61 end
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62 local expires_at = parse_x509_datetime(cert:notafter());
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63 local expires_in = os.difftime(expires_at, now);
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64 local fmt = "Certificate %s expires in %s"
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65 local nag_admin = expires_in < nag_time;
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66 local log_warn = expires_in < nag_time * 2;
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67 local timediff = expires_in;
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68 if expires_in < 0 then
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69 fmt = "Certificate %s expired %s ago";
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70 timediff = -timediff;
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71 end
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72 timediff = humantime(timediff);
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73 module:log(log_warn and "warn" or "info", fmt, certfile, timediff);
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74 if nag_admin then
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75 local body = fmt:format("for host ".. module.host, timediff);
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76 for _,admin in ipairs(module:get_option_array("admins", {})) do
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77 module:send(st.message({ from = module.host, to = admin, type = "chat" }, body));
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78 end
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79 end
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80 return math.max(86400, expires_in / 3);
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81 end
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82
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83 module:add_timer(1, check_certs_validity);