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annotate mod_checkcerts/mod_checkcerts.lua @ 2493:a6486881fe42

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mod_s2s_auth_dane/README: Mention the race condition in the absence of util.async
author Kim Alvefur <zash@zash.se>
date Sun, 12 Feb 2017 17:05:44 +0100
parents a7c1f1b6ef05
children ec7f9c8f2a5f
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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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20
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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, ferr = io.open(certfile); -- Load the file.
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54 if not fh then
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55 log("warn", "Could not open certificate %s", ferr);
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56 return;
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57 end
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58 local cert, lerr = load_cert(fh:read("*a")); -- And parse
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59 fh:close();
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60 if not cert then
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61 log("warn", "Could not parse certificate %s: %s", certfile, lerr or "");
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62 return;
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63 end
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64
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65 local expires_at = parse_x509_datetime(cert:notafter());
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66 local expires_in = os.difftime(expires_at, now);
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67 local fmt = "Certificate %s expires in %s"
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68 local nag_admin = expires_in < nag_time;
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69 local log_warn = expires_in < nag_time * 2;
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70 local timediff = expires_in;
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71 if expires_in < 0 then
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72 fmt = "Certificate %s expired %s ago";
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73 timediff = -timediff;
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74 end
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75 timediff = humantime(timediff);
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76 module:log(log_warn and "warn" or "info", fmt, certfile, timediff);
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77 if nag_admin then
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78 local body = fmt:format("for host ".. module.host, timediff);
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79 for _,admin in ipairs(module:get_option_array("admins", {})) do
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80 module:send(st.message({ from = module.host, to = admin, type = "chat" }, body));
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81 end
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82 end
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83 return math.max(86400, expires_in / 3);
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84 end
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85
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86 module:add_timer(1, check_certs_validity);