Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 4362:116c88c28532

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mod_http_admin_api: restructure group-related info in API - Return the members of the group right in the get_group_by_id call. This is an O(1) of extra work. - Remove the groups attribute from get_user_by_name as that is O(n) of work and rarely immediately needed. The replacement for the group membership information in the user is for now to use the group API and iterate; future work may fix that.
author Jonas Schäfer <jonas@wielicki.name>
date Wed, 20 Jan 2021 15:30:29 +0100
parents 82482e7e92cb
children
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rev   line source
2112
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
Kim Alvefur <zash@zash.se>
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
Kim Alvefur <zash@zash.se>
parents: 2890
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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
Kim Alvefur <zash@zash.se>
parents: 2891
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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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parents: 2891
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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>
parents: 2203
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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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parents: 2892
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21 local log = (session and session.log) or module._log;
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parents: 2203
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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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parents: 2203
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26 local rbl_ip, err = reverse(ip, rbl);
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parents: 2203
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27 if not rbl_ip then
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parents: 2892
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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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parents: 2892
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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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parents: 2203
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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
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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);