[v18] Tighten kinit file permissions#63941
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The Kerberos kinit client for database access temporarily writes a certificate (and its key and corresponding CA) to a temporary directory with world-reabable (and writable) permissions. The permissions on the parent directory are correctly restricted to the current user only, so there is no exploit possible, this change just adds defense in depth by restricting the file permissions as well.
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Backport #63916 to branch/v18