Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 5608:1893ae742f66

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mod_http_oauth2: Show errors on device flow user code entry page If the user enters the code incorrectly, having to click back to try again is no fun. Instead, show the error and the code entry form again.
author Kim Alvefur <zash@zash.se>
date Wed, 19 Jul 2023 13:05:47 +0200
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>
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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
0890c4860f14 mod_register_dnsbl: Initial commit of module to check users registering against an DNS block list
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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
bf9fc41bf7ad mod_register_dnsbl: Add support for IPv6 DNSBL
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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
Kim Alvefur <zash@zash.se>
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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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Matthew Wild <mwild1@gmail.com>
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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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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
6412595e2046 mod_register_dnsbl: Use async support in trunk to actually block registration if a positive match is found in the DNSBL
Kim Alvefur <zash@zash.se>
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);