[PATCH] backup(.pl): Replace OpenVPN DH parameter with ffdhe4096

["Peter Müller" <peter.mueller@ipfire.org>]

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This ensures restoring a backup won't silently bring back an insecure
Diffie-Hellman parameter (which could also not be inspected through the
web interface anymore).

Reported-by: Michael Tremer <michael.tremer(a)ipfire.org>
Signed-off-by: Peter Müller <peter.mueller(a)ipfire.org>
---
 config/backup/backup.pl | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/config/backup/backup.pl b/config/backup/backup.pl
index 6fd9e45bb..520d9315d 100644
--- a/config/backup/backup.pl
+++ b/config/backup/backup.pl
@@ -187,6 +187,15 @@ restore_backup() {
 	# Update OpenVPN CRL
 	/etc/fcron.daily/openvpn-crl-updater
 
+	# Replace previously used OpenVPN Diffie-Hellman parameter by ffdhe4096
+	if [ -f /var/ipfire/ovpn/server.conf ]; then
+		sed -i 's|/var/ipfire/ovpn/ca/dh1024.pem|/etc/ssl/ffdhe4096.pem|' /var/ipfire/ovpn/server.conf
+	fi
+
+	if [ -f "/var/ipfire/ovpn/n2nconf/*/*.conf" ]; then
+		sed -i 's|/var/ipfire/ovpn/ca/dh1024.pem|/etc/ssl/ffdhe4096.pem|' /var/ipfire/ovpn/n2nconf/*/*.conf
+	fi
+
 	return 0
 }
 
-- 
2.35.3