view mod_tls_policy/mod_tls_policy.lua @ 5296:0f5657db1cfc

mod_isolate_host: handle server-generated stanzas The hook for setting the no_host_isolation is only called for c2s sessions. This does not work for stanzas generated by the server, such as PEP notifications or presence probe answers. To handle that, we do per-stanza checks for the case that the origin is local.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 01 Apr 2023 12:03:08 +0200
parents 1b701f208b1b
children
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assert(require"ssl.core".info, "Incompatible LuaSec version");

local function hook(event_name, typ, policy)
	if not policy then return end
	if policy == "FS" then
		policy = { cipher = "^E?C?DHE%-" };
	elseif type(policy) == "string" then
		policy = { cipher = policy };
	end

	module:hook(event_name, function (event)
		local origin = event.origin;
		if origin.conn and origin.conn:ssl() then
			local info = origin.conn:socket():info();
			for key, what in pairs(policy) do
				module:log("debug", "Does info[%q] = %s match %s ?", key, tostring(info[key]), tostring(what));
				if (type(what) == "number" and what < info[key] ) or (type(what) == "string" and not info[key]:match(what)) then
					origin:close({ condition = "policy-violation", text = ("TLS %s '%s' not acceptable"):format(key, tostring(info[key])) });
					return false;
				end
				module:log("debug", "Seems so");
			end
			module:log("debug", "Policy matches");
		end
	end, 1000);
end

local policy = module:get_option(module.name, {});

if type(policy) == "string" then
	policy = { c2s = policy, s2s = policy };
end

hook("stream-features", "c2s", policy.c2s);
hook("s2s-stream-features", "s2sin", policy.s2sin or policy.s2s);
hook("stanza/http://etherx.jabber.org/streams:features", "s2sout", policy.s2sout or policy.s2s);