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Add checks for other shadow and passwd/group files into os-02 and os-03 rules #162

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@cmhe cmhe commented Oct 25, 2021

This adds the checks for the other shadow and passwd files into the existing rules os-02 and os-03.

An alternative solution would be to create additional rule ids, in order to prevent changing the existing ones. However it does make sense to me to handle all similar files in one rule, instead of creating additional one.

It should lessen the maintenance overhead.

If changing existing rules it not possible, then I would be willing to create additional rules for those other files.

Closes: #161

@cmhe cmhe force-pushed the ISSUE-161 branch 2 times, most recently from 0bd9bca to 81489d9 Compare October 25, 2021 08:14
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cmhe commented Oct 25, 2021

I shorted the control documentation in order to pass the Metrics/BlockLength: Block has too many lines. [36/35] style check.

Not sure how much good such an arbitrary check will do :/

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Currently only `/etc/shadow` is checked to have the right permissions,
but there are other files that can/could contain password hashes as
well, which are not checked yet:

 - /etc/shadow- (a backup file for /etc/shadow)
 - /etc/gshadow (contains group password hashes)
 - /etc/gshadow- (a backup file for /etc/gshadow-)

While the control requires `/etc/shadow` and `/etc/gshadow` to exist,
the rules for their backup counterparts are a bit more relaxed. The
checks will be skipped, if those files do not exist.

Signed-off-by: Claudius Heine <[email protected]>
Currently only `/etc/passwd` is checked to have the right permissions,
but there are other files that contain unix account related configuration:

 - /etc/passwd- (a backup file for /etc/passwd)
 - /etc/group (contains group configuration and membership)
 - /etc/group- (a backup file for /etc/group-)

While the control requires `/etc/passwd` and `/etc/group` to exist,
the rules for their backup counterparts are a bit more relaxed. The
checks will be skipped, if those files do not exist.

Signed-off-by: Claudius Heine <[email protected]>
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schurzi commented Nov 7, 2021

I shorted the control documentation in order to pass the Metrics/BlockLength: Block has too many lines. [36/35] style check.

Not sure how much good such an arbitrary check will do :/

We already had a discussion on this. https://github.com/orgs/dev-sec/teams/contributors/discussions/3
I think I will have some time to update our linting to cookstyle in the coming week. Currently we have a kind of arbitrary/default rubocop style set, that is not entirely optimal.

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Add file system checks for other shadow and passwd/group files
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