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Unix file protection ACLs

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Fixed-structure, discretionary ACL

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Each file system object has an ACL

  • Binding 3 rights to 3 subjects.

  • Only the owner can update the ACL.

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Rights: R W X

  • Read (file data)/List directory.

  • Write (file data)/create or remove files or subdirectories.

  • Execute/use as process’ current working directory.

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Subjects

  • An UID (owner).

  • A GID.

  • Others.

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