File

mod_s2s_keysize_policy/mod_s2s_keysize_policy.lua @ 4282:281a864e7472

mod_pubsub_feeds: Don't skip publishing items after an existing one I encountered a feed which was backwards, such that older entries were considered first and then it would skip newer entries. This may however run into trouble if the feed contains more items than what's persisted in pubsub.
author Kim Alvefur <zash@zash.se>
date Mon, 30 Nov 2020 15:17:29 +0100
parent 2424:27ffa6521d4e
line wrap: on
line source

-- 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);