Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 4049:78f1de5301fc

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mod_adhoc_dataforms_demo: Fix duplicate field prevention It's supposed to only include each type of form field once per form at most but it didn't note which fields it had added already. No idea what the probability was anyways, probably pretty low.
author Kim Alvefur <zash@zash.se>
date Tue, 23 Jun 2020 19:40:55 +0200
parents bf9fc41bf7ad
children 82482e7e92cb
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0890c4860f14 mod_register_dnsbl: Initial commit of module to check users registering against an DNS block list
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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 if not ip then
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22 session.log("debug", "Unable to check DNSBL when IP is unknown");
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23 return;
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24 end
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25 local rbl_ip, err = reverse(ip, rbl);
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26 if not rbl_ip then
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27 session.log("debug", "Unable to check DNSBL for ip %s: %s", ip, err);
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28 return;
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29 end
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30
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31 local wait, done = async.waiter();
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32 adns.lookup(function (reply)
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33 if reply and reply[1] and reply[1].a then
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34 session.log("debug", "DNSBL response: %s IN A %s", rbl_ip, reply[1].a);
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35 session.log("info", "Blocking %s from registering %s (dnsbl hit)", ip, event.username);
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36 event.allowed = false;
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37 event.reason = "Blocked by DNSBL";
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38 end
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parents: 2203
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39 done();
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40 end, rbl_ip);
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41 wait();
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42 end);