Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 3715:f03a023cd523

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mod_http_muc_log: Compose page title from room data More flexible than composing the title from name and date in the controller. Also opens the door to using other room data fields.
author Kim Alvefur <zash@zash.se>
date Sun, 13 Oct 2019 16:16:14 +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);