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annotate mod_sasl_ssdp/mod_sasl_ssdp.lua @ 5897:896e7c7bf87f

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Merge
author Stephen Paul Weber <singpolyma@singpolyma.net>
date Tue, 30 Apr 2024 15:07:06 -0500
parents bb51cf204dd4
children
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3a7349aa95c7 mod_sasl_ssdp: New module implementing XEP-0474 SASL SCRAM Downgrade Protection
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1 local array = require "util.array";
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2 local hashes = require "util.hashes";
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3 local it = require "util.iterators";
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4 local base64_enc = require "util.encodings".base64.encode;
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6 local hash_functions = {
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7 ["SCRAM-SHA-1"] = hashes.sha1;
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8 ["SCRAM-SHA-1-PLUS"] = hashes.sha1;
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9 ["SCRAM-SHA-256"] = hashes.sha256;
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10 ["SCRAM-SHA-256-PLUS"] = hashes.sha256;
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11 };
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13 function add_ssdp_info(event)
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14 local sasl_handler = event.session.sasl_handler;
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15 local hash = hash_functions[sasl_handler.selected];
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16 if not hash then
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17 module:log("debug", "Not enabling SSDP for unsupported mechanism: %s", sasl_handler.selected);
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18 return;
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19 end
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20 local mechanism_list = array.collect(it.keys(sasl_handler:mechanisms())):sort();
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21 local cb = sasl_handler.profile.cb;
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22 local cb_list = cb and array.collect(it.keys(cb)):sort();
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23 local ssdp_string;
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24 if cb_list then
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25 ssdp_string = mechanism_list:concat(",").."|"..cb_list:concat(",");
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26 else
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27 ssdp_string = mechanism_list:concat(",");
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28 end
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29 module:log("debug", "Calculated SSDP string: %s", ssdp_string);
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30 event.message = event.message..",d="..base64_enc(hash(ssdp_string));
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31 sasl_handler.state.server_first_message = event.message;
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32 end
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34 module:hook("sasl/c2s/challenge", add_ssdp_info, 1);
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35 module:hook("sasl2/c2s/challenge", add_ssdp_info, 1);
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