[rsbac] Capabilities

Amon Ott ao at rsbac.org
Tue May 4 16:25:21 CEST 2004

On Dienstag, 4. Mai 2004 16:08, Rob See wrote:
> 	I'm working on getting the backup script to run as a different user 
> and I wanted to do it by assigning CAP_DAC_READ_SEARCH to whichever 
> binaries need it to  run correctly. I've tried assigning it in min caps 
> for the script and the binaries and It still can't read all files and 
> directories. Am I understanding the way capabilities work? It is true 
> that by assigning minimum caps, they are assigned to the process even 
> if it wouldn't normally have them ? Also, how does inheritance work 

You must assign them directly to the program that does the access, e.g. 
attr_set_file_dir. The easiest way here is to assign min_caps to the user, 
not the programs. It does work this way and with an ls here.

> with capabilities ? Do they need to be assigned to each binary, or will 
> assigning them to the parent process cause them to flow down ? Is there 

There is no inheritance for CAP settings yet.

> any way to see what capabilities a process is running with ? Has 

No, I have not (yet) implemented such a way.

> anybody else seen them work right with 2.6.5 ? Also, I've noticed that 
> there is a capabilities LSM module. Does that need to be compiled for 
> them to work correctly?

If you enabled LSM, you also need to select the capabilities, without LSM 
they are compiled in as fixed code. The last time I checked, you could not 
register an LSM module after the capabilities, because that code did not 
support stacking.

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