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Re: Apparmor pain

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On Fri 29 Jan 2021 at 14:21:07 +0000, Tony van der Hoff wrote:

> 
> 
> On 29/01/2021 13:27, Reco wrote:
> > 	Hi.
> > 
> > On Fri, Jan 29, 2021 at 12:49:42PM +0000, Tony van der Hoff wrote:
> > > This is a simplified scenario: Say I have 2 machines, both running Debian 10.7. Each machine has 3 users: A, B and C. Each machine has an identical (mantained
> > > by Unison) directoery: /home/C/pictures, with permissions ugo:rwx owned by C. Each file therein has permissions ugo:r
> > ...
> > > I don't understand why my two machines are behaving so differently.
> > 
> > uid difference between hosts A and B, most probably.
> > Along the other things, thunderbird's apparmor policy contains this:
> > 
> >      owner @{HOME}/** r,
> > 
> > I.e. it's allowed to read any file at /home as long as the file is owned
> > by thunderbird's uid.
> > 
> > 
> > > I don't think I really want apparmor running at all,
> > 
> > Add apparmor=0 to kernel's cmdline. Building a kernel without apparmor
> > helps with that too, but that's straying too far from Debian's defaults.
> > 
> > 
> > > The debian wiki gives me a way to disable apparmor by patching grub,
> > > but that seems like overkill.
> > 
> > You probably got it wrong. Modifying a kernel cmdline and rebuilding
> > grub with custom patches are different, and they should suggest former
> > at Debian's wiki.
> > 
> > 
> > > Does anyone pease have any suggestions on how to enable an application
> > > without major surgery? any help appreciated. Thanks
> > 
> > Disabling a problematic apparmor profile altogether is done by:
> > 
> > /usr/sbin/aa-disable /usr/bin/thunderbird
> > 
> > Disabling a problematic apparmor profile but keeping audit records
> > generation is done by
> > 
> > /usr/sbin/aa-complain /usr/bin/thunderbird
> > 
> > You'll want the first one, probably.
> > 
> > Reco
> > 
> 
> Thanks, Reco, that was just the information I needed. I had to install
> apparmor-utils, but otherwise aa-disable did the job.

Debian's default provision of apparmor is something I can take or
leave. Generally, I leave it by purging it from the system rather
than installing another unneeded package.

-- 
Brian.

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Thread

Apparmor pain Tony van der Hoff <lists@vanderhoff.org> - 2021-01-29 14:10 +0100
  Re: Apparmor pain Reco <recoverym4n@enotuniq.net> - 2021-01-29 14:30 +0100
    Re: Apparmor pain Tony van der Hoff <lists@vanderhoff.org> - 2021-01-29 15:30 +0100
      Re: Apparmor pain Brian <ad44@cityscape.co.uk> - 2021-01-29 16:50 +0100
      Re: Apparmor pain David Wright <deblis@lionunicorn.co.uk> - 2021-01-29 18:00 +0100

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