Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 4210:a0937b5cfdcb

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mod_invites_page: Remove preauth URI button This button is incompatible with the majority of XMPP clients around, yet based on feedback from users, many are drawn to click it when they have any XMPP client installed already. In the case where the user already has software installed, we would prefer them to select it from the software list so they can follow the setup process suited to their specific client (we already track which software supports preauth URIs). If their client is not listed, they can still use the manual registration link instead.
author Matthew Wild <mwild1@gmail.com>
date Fri, 16 Oct 2020 11:03:38 +0100
parents 82482e7e92cb
children
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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>
parents:
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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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parents: 2203
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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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parents: 2203
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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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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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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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parents: 2203
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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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parents: 2203
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37 event.allowed = false;
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38 event.reason = "Blocked by DNSBL";
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parents: 2203
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39 end
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parents: 2203
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40 done();
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parents: 2203
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41 end, rbl_ip);
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parents: 2203
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42 wait();
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43 end);