Sudo access of rm to non-root user


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# 1  
Sudo access of rm to non-root user

Hello,
It is Solaris-10. There is a file as /opt/vpp/dom1.2/pdd/today_23. It is always generated by root, so owned by root only.
This file has to be deleted as part of application restart always and that is done by app_user and SA is always involved to do rm on that file.
Is it possible to give rm access to app_user, only to that file, via sudoers ? So that, he can delete only that file, not any other path or file or folder.

Regards

Last edited by solaris_1977; 08-23-2017 at 11:17 PM..
# 2  
Why do you not change the app running as root to chmod/chown permissions required to allow the correct user to delete the file? Or have the app run by the user to start with?
# 3  
This application should not run as root.
If application team needs to restart their application, they are required to remove file /opt/vpp/dom1.2/pdd/today_23 or else application will not start clean. And this file is owned by root always. app_user should be eligible so restart this application, so I have already given start/stop sudo access to app_user, but not sure how should I give rm access only for that specific file.
# 4  
Quote:
Originally Posted by solaris_1977
This application should not run as root.
If application team needs to restart their application, they are required to remove file /opt/vpp/dom1.2/pdd/today_23 or else application will not start clean. And this file is owned by root always. app_user should be eligible so restart this application, so I have already given start/stop sudo access to app_user, but not sure how should I give rm access only for that specific file.
You're missing the point.

We understand that your application should not run as root. What Jim suggested is that the other application that is creating a file owned by root should change the owner of the file that you want your application to remove to be app_user; not root. If a user needs to be able to remove a file, that user needs to have appropriate permissions to remove that file. If a user named app_user needs to be able to remove a file, there is no reason why a user named root needs to own that file.
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# 5  
I got the point. It may be nature of application, the way it is creating file with root ownership. I can check with application owner, if this nature can be changed.

But, is it possible at all, to give sudo access to app_user to remove that root owned file ? I just want to have my statement correct, before jumping into discussion with them.
# 6  
I agree that the process that creates the file needs to be looked at first.
  • What can you tell us about it?
  • Does it write anything useful to the file or is it created empty?
  • Why can the application account not create it?

Do you have write access to the directory that this file is in? If so, can you not remove the file anyway? (or is the sticky bit set?)
If the file has to be removed, your application must be able to create a replacement else


There are certainly several ways to grant a remove privilege, but that's probably not the best way to do it.
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# 7  
Quote:
Originally Posted by solaris_1977
I got the point. It may be nature of application, the way it is creating file with root ownership. I can check with application owner, if this nature can be changed.

But, is it possible at all, to give sudo access to app_user to remove that root owned file ? I just want to have my statement correct, before jumping into discussion with them.
Probably the worst approach to fixing a problem is writing more code to paper over the symptom of the problem instead of just fixing the actual problem.

Your problem here is a file has ownership/permissions that prevent processing per your system's requirements.

Instead of fixing that problem, your proposed solution is to write even more code and/or create something new in order to change the symptom.

So instead of a fixed problem, you now have a problem, a patch that hides that problem, an entire set of undocumented dependencies for working around that problem, and a requirement to spend future resources keeping that patch working.

Ever wonder how computer systems get unreliable?

That's exactly how.

Do you want reliable systems?

FIX the actual problems, never ADD extras to patch over and hide them.
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