ticket: properly verify exactly 5min old tickets

to fix an issue where valid tickets could be rejected 5 minutes after a
key rotation, where the minimum age is exactly 0 seconds.

thanks Dominik for triaging!

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

diff --git a/PVE/AccessControl.pm b/PVE/AccessControl.pm
index 5de060dfced07b7d370ee451e5388a7de68bbe99..fff2df2d7ebec40b0e04779e53ec6d4f2250d43d 100644 (file)
--- a/PVE/AccessControl.pm
+++ b/PVE/AccessControl.pm
@@ -283,7 +283,7 @@ sub verify_ticket {
        return undef if !$rsa_pub;
 
        my ($min, $max) = $get_ticket_age_range->($now, $rsa_mtime, $old);
-       return undef if !$min;
+       return undef if !defined($min);
 
        return PVE::Ticket::verify_rsa_ticket(
            $rsa_pub, 'PVE', $ticket, undef, $min, $max, 1);