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Where to store the password: in RAM or another user's home folder (Linux)

Linux is designed to protect user2's files from user1, not user1's memory from itself. If an attacker is able to run arbitrary code on user1, he will be able to fairly easily gain access to the memory ...
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Linux access control policies sudoers

Whether it's overkill or not depends on your use cases and your risk assessment. It sounds like you're describing Role-based Access Control (RBAC). RBAC is a popular method to help enable ...
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