File

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−local array = require "util.array";
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−local hashes = require "util.hashes";
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−local it = require "util.iterators";
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−local base64_enc = require "util.encodings".base64.encode;
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−
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−local hash_functions = {
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−	["SCRAM-SHA-1"] = hashes.sha1;
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−	["SCRAM-SHA-1-PLUS"] = hashes.sha1;
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−	["SCRAM-SHA-256"] = hashes.sha256;
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−	["SCRAM-SHA-256-PLUS"] = hashes.sha256;
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−};
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−
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−function add_ssdp_info(event)
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−	local sasl_handler = event.session.sasl_handler;
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−	local hash = hash_functions[sasl_handler.selected];
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−	if not hash then
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−		module:log("debug", "Not enabling SSDP for unsupported mechanism: %s", sasl_handler.selected);
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−		return;
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−	end
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−	local mechanism_list = array.collect(it.keys(sasl_handler:mechanisms())):sort();
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−	local cb = sasl_handler.profile.cb;
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−	local cb_list = cb and array.collect(it.keys(cb)):sort();
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−	local ssdp_string;
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−	if cb_list then
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−		ssdp_string = mechanism_list:concat(",").."|"..cb_list:concat(",");
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−	else
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−		ssdp_string = mechanism_list:concat(",");
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−	end
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−	module:log("debug", "Calculated SSDP string: %s", ssdp_string);
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−	event.message = event.message..",d="..base64_enc(hash(ssdp_string));
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−	sasl_handler.state.server_first_message = event.message;
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−end
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−
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−module:hook("sasl/c2s/challenge", add_ssdp_info, 1);
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−module:hook("sasl2/c2s/challenge", add_ssdp_info, 1);
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−