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view mod_s2s_keysize_policy/mod_s2s_keysize_policy.lua @ 5616:59d5fc50f602

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mod_http_oauth2: Implement refresh token rotation Makes refresh tokens one-time-use, handing out a new refresh token with each access token. Thus if a refresh token is stolen and used by an attacker, the next time the legitimate client tries to use the previous refresh token, it will not work and the attack will be noticed. If the attacker does not use the refresh token, it becomes invalid after the legitimate client uses it. This behavior is recommended by draft-ietf-oauth-security-topics
author Kim Alvefur <zash@zash.se>
date Sun, 23 Jul 2023 02:56:08 +0200
parents 27ffa6521d4e
children
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-- mod_s2s_keysize_policy.lua
-- Requires LuaSec with this patch: https://github.com/brunoos/luasec/pull/12

module:set_global();

local datetime_parse = require"util.datetime".parse;
local pat = "^([JFMAONSD][ceupao][glptbvyncr])  ?(%d%d?) (%d%d):(%d%d):(%d%d) (%d%d%d%d) GMT$";
local months = {Jan=1,Feb=2,Mar=3,Apr=4,May=5,Jun=6,Jul=7,Aug=8,Sep=9,Oct=10,Nov=11,Dec=12};
local function parse_x509_datetime(s)
	local month, day, hour, min, sec, year = s:match(pat); month = months[month];
	return datetime_parse(("%04d-%02d-%02dT%02d:%02d:%02dZ"):format(year, month, day, hour, min, sec));
end

local weak_key_cutoff = datetime_parse("2014-01-01T00:00:00Z");

-- From RFC 4492
local weak_key_size = {
	RSA = 2048,
	DSA = 2048,
	DH  = 2048,
	EC  =  233,
}

module:hook("s2s-check-certificate", function(event)
	local host, session, cert = event.host, event.session, event.cert;
	if cert and cert.pubkey then
		local _, key_type, key_size = cert:pubkey();
		if key_size < ( weak_key_size[key_type] or 0 ) then
			local issued = parse_x509_datetime(cert:notbefore());
			if issued > weak_key_cutoff then
				session.log("warn", "%s has a %s-bit %s key issued after 31 December 2013, invalidating trust!", host, key_size, key_type);
				session.cert_chain_status = "invalid";
				session.cert_identity_status = "invalid";
			else
				session.log("warn", "%s has a %s-bit %s key", host, key_size, key_type);
			end
		else
			session.log("info", "%s has a %s-bit %s key", host, key_size, key_type);
		end
	end
end);