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Status Not under consideration
Workspace z/OS
Categories RACF
Created by Guest
Created on May 8, 2019
Merged idea
This idea has been merged into another idea. To comment or vote on this idea, please visit ZOS-I-1253 Make &RACUID avail as RACF var (RACVARS) for any gen profile.

Usage of &RACUID in class FSACCESS Merged

In z/OS UNIX System Services all superusers (uid=0 or BPX.SUPERUSER) have permission to write in foreign HOME directories and this can not be prevented from doing so by RACF-class FSACCESS because &RACUID is not supported in class FSACCESS.


PERMIT <uss-home directory> GENERIC CLASS(FSACCESS) ID(&RACUID)
ACCESS (ALTER)

Idea priority Medium
  • Guest
    Reply
    |
    Dec 19, 2019

    We accept this as an uncommitted candidate. Thank you.

  • Guest
    Reply
    |
    Jul 1, 2019

    Please give us a general use case scenario that describes your requirement.
    -> Answer from my collegue:
    Userids with sufficient authority to change another user's private .ssh directory (e.g. via a UNIXPRIV privilege to SUPERUSER.FILESYS) could put their own private key in another user's authorized_key file and after that establish a ssh-session with this other user's userid.

  • Guest
    Reply
    |
    Jul 1, 2019

    Is it possible you are requesting a method to allow only the user who owns the filesystem directory to access it?
    -> yes, that's my request. Superuser should be prevented despite superuser authority to change home directories of other users

    We are guessing from your PERMIT example that you mount a separate filesystem for every user's home directory ??? Is that correct?
    -> yes, that's correct. Every user has his own sperate home directory.

    Please give us a general use case scenario that describes your requirement.
    -> I asked my colleague, who suggested protection via fsaccess, to provide detailed Information

    Kind regards, Dieter

  • Guest
    Reply
    |
    Jun 28, 2019

    .Thank you for submitting this requirement. After careful discussions with the development, we request additional information.

    Contrary to the statement made in the description, superusers do not have access by default to directories in filesystems protected by an FSACCESS class profile. If RACF supported &RACUID in the access list for the profile, then every user would have that access to the resource.

    Is it possible you are requesting a method to allow only the user who owns the filesystem directory to access it? We are guessing from your PERMIT example that you mount a separate filesystem for every user's home directory ??? Is that correct? Please give us a general use case scenario that describes your requirement.

    Thank you.