Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 4066:07ae583bc565

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mod_rest: Add support for form-encoded output This roughtly matches the input capabilities when given an form-encoded payload.
author Kim Alvefur <zash@zash.se>
date Mon, 20 Jul 2020 21:42:11 +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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39 done();
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40 end, rbl_ip);
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41 wait();
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42 end);