Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 3571:f5ea0b886c7c

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mod_storage_xmlarchive: Limit search to smallest time range in case of inexact match This should improve performance in case the exact days in the 'start' and 'end' range are missing from the index.
author Kim Alvefur <zash@zash.se>
date Fri, 03 May 2019 18:59:38 +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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6412595e2046 mod_register_dnsbl: Use async support in trunk to actually block registration if a positive match is found in the DNSBL
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2 local async = require "util.async";
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84670bac7348 mod_register_dnsbl: Use util.net for IP address parsing
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3 local inet_pton = require "util.net".pton;
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bf9fc41bf7ad mod_register_dnsbl: Add support for IPv6 DNSBL
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4 local to_hex = require "util.hex".to;
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6412595e2046 mod_register_dnsbl: Use async support in trunk to actually block registration if a positive match is found in the DNSBL
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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);