Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 5265:f845c218e52c

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mod_http_oauth2: Allow revoking a token without OAuth client credentials If you have a valid token, and you're not supposed to have it, revoking it seems the most responsible thing to do with it, so it should be allowed, while if you are supposed to have it, you should also be allowed to revoke it.
author Kim Alvefur <zash@zash.se>
date Tue, 21 Mar 2023 22:02:38 +0100
parents 82482e7e92cb
children
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rev   line source
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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>
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1 local adns = require "net.adns";
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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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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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82482e7e92cb mod_register_dnsbl: Handle missing session in user-registering event (thanks meaz)
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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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parents: 2203
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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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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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42 wait();
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43 end);