Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 4151:fa79d19d0fdd

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mod_cloud_notify: fix comment text
author tmolitor <thilo@eightysoft.de>
date Wed, 23 Sep 2020 19:55:46 +0200
parents 82482e7e92cb
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0890c4860f14 mod_register_dnsbl: Initial commit of module to check users registering against an DNS block list
Kim Alvefur <zash@zash.se>
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1 local adns = require "net.adns";
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2 local async = require "util.async";
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3 local inet_pton = require "util.net".pton;
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4 local to_hex = require "util.hex".to;
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5
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6 local rbl = module:get_option_string("registration_rbl");
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7
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8 local function reverse(ip, suffix)
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9 local n, err = inet_pton(ip);
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10 if not n then return n, err end
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11 if #n == 4 then
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12 local a,b,c,d = n:byte(1,4);
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13 return ("%d.%d.%d.%d.%s"):format(d,c,b,a, suffix);
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14 elseif #n == 16 then
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15 return to_hex(n):reverse():gsub("%x", "%1.") .. suffix;
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16 end
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17 end
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18
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19 module:hook("user-registering", function (event)
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20 local session, ip = event.session, event.ip;
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21 local log = (session and session.log) or module._log;
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22 if not ip then
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23 log("debug", "Unable to check DNSBL when IP is unknown");
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24 return;
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25 end
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26 local rbl_ip, err = reverse(ip, rbl);
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27 if not rbl_ip then
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28 log("debug", "Unable to check DNSBL for ip %s: %s", ip, err);
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29 return;
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30 end
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31
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32 local wait, done = async.waiter();
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33 adns.lookup(function (reply)
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34 if reply and reply[1] and reply[1].a then
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35 log("debug", "DNSBL response: %s IN A %s", rbl_ip, reply[1].a);
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36 log("info", "Blocking %s from registering %s (dnsbl hit)", ip, event.username);
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37 event.allowed = false;
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38 event.reason = "Blocked by DNSBL";
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39 end
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40 done();
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41 end, rbl_ip);
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42 wait();
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43 end);