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Status Future consideration
Workspace AIX
Created by Guest
Created on Aug 16, 2022

RBAC Domain assignment for a file gets lost when cp is used.

When using Domain RBAC to implement access restrictions to files based on classifications. i.e. CONFIDENTIAL or SECRET as a domain name. However, when a domain SECRET is assigned to a file in directory /secret/ and someone with access to the file uses the cp command to copy the file to another directory, the domain assignment is lost and everyone can access the classified data.

The domain relation should be copied too. So that the access restrictions stay in place.

Idea priority High
  • Guest
    Mar 30, 2023
    Though RBAC domain may not help here but EFS (Encrypted File System) can be used to achieve very similar functionality.

    After enabling EFS, create a FS with efs enabled and mount the same.
    Encrypt the file using efsmgr -e encfile.
    Once encrypted, it can copied using cp command to other dir on the same FS (EFS is enabled) or another FS which is again enabled with EFS.
    In case of EFS, the file attributes which contains the extended attributes to store meta data for encryption/decryption will be copied as well.
    The default cp command copies with these extended attributes.
    This way the file on the other dir can?t be read in clear text without the user/owner keys. However the owner can provide access to other user with efsmgr -a /mnt/ec/encfile -u <user> command.
    The user can use his keys to decrypt the target file and open the file in clear text.