aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_s2s_auth_certs.lua
blob: f917b1168964a93d85095ee1ca2c49fc23e7dca7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
module:set_global();

local cert_verify_identity = require "util.x509".verify_identity;
local NULL = {};
local log = module._log;

local measure_cert_statuses = module:metric("counter", "checked", "", "Certificate validation results",
	{ "chain"; "identity" })

module:hook("s2s-check-certificate", function(event)
	local session, host, cert = event.session, event.host, event.cert;
	local conn = session.conn;
	local log = session.log or log;

	local secure_hostname = conn.extra and conn.extra.secure_hostname;

	if not cert then
		log("warn", "No certificate provided by %s", host or "unknown host");
		return;
	end

	local chain_valid, errors;
	if conn.ssl_peerverification then
		chain_valid, errors = conn:ssl_peerverification();
	else
		chain_valid, errors = false, { { "Chain verification not supported by this version of LuaSec" } };
	end
	-- Is there any interest in printing out all/the number of errors here?
	if not chain_valid then
		log("debug", "certificate chain validation result: invalid");
		for depth, t in pairs(errors or NULL) do
			log("debug", "certificate error(s) at depth %d: %s", depth-1, table.concat(t, ", "))
		end
		session.cert_chain_status = "invalid";
		session.cert_chain_errors = errors;
	else
		log("debug", "certificate chain validation result: valid");
		session.cert_chain_status = "valid";

		-- We'll go ahead and verify the asserted identity if the
		-- connecting server specified one.
		if host then
			if cert_verify_identity(host, "xmpp-server", cert) then
				session.cert_identity_status = "valid"
			else
				session.cert_identity_status = "invalid"
			end
			log("debug", "certificate identity validation result: %s", session.cert_identity_status);
		end

		-- Check for DNSSEC-signed SRV hostname
		if secure_hostname and session.cert_identity_status ~= "valid" then
			if cert_verify_identity(secure_hostname, "xmpp-server", cert) then
				module:log("info", "Secure SRV name delegation %q -> %q", secure_hostname, host);
				session.cert_identity_status = "valid"
			end
		end
	end
	measure_cert_statuses:with_labels(session.cert_chain_status or "unknown", session.cert_identity_status or "unknown"):add(1);
end, 509);