// Check if the file is owned by current user and has 0600 permissions.
// If it doesn't, it's a fake file, possibly meant as a DoS attack, and
// so we refuse to touch it:
// Check if the file is owned by current user and has 0600 permissions.
// If it doesn't, it's a fake file, possibly meant as a DoS attack, and
// so we refuse to touch it: