audit watch rules and docker containers

[Richard Guy Briggs]

On 2018-03-03 08:52, Rakesh wrote:
> Hello Auditd'ers,

Hi Rakesh,
(I see, with difficulty, that your output is well-formatted in the HTML
attachment, but that isn't useful.  Please shut off HTML message
formatting and ensure that it looks right in plain text.  Also, please
use "ls -l" so it sorts in a meaningful order for comparison.)

> I am running a privileged container with pid, net, uts space shared with the host. The need is to be able to set file watch rules from the container say 
> -k /etc -p rw -k containter_rule
> and then look for read/write access to files/directories in /var/log/audit/*.
> What I am finding is there are no watch events being logged
> If I set the same audit watch rule from the host (and not being in the privileged container) I am able to get audit events
> Using nsenter to switch namespace (nsenter -t 1 auditctl -k /etc -p rw -k containter_rule) does not help either
> I suspect the mnt namespace is different which is causing this oddity in behavior
> looking at container process namespace -
> test at ubuntu-16:~/audit$ sudo ls -latr  /proc/26050/ns[sudo] password for test:total 0dr-xr-xr-x 9 root root 0 Mar  2 16:58 ..dr-x--x--x 2 root root 0 Mar  2 17:46 .lrwxrwxrwx 1 root root 0 Mar  2 17:46 uts -> uts:[4026531838]lrwxrwxrwx 1 root root 0 Mar  2 17:46 user -> user:[4026531837]lrwxrwxrwx 1 root root 0 Mar  2 17:46 pid -> pid:[4026531836]lrwxrwxrwx 1 root root 0 Mar  2 17:46 net -> net:[4026531957]lrwxrwxrwx 1 root root 0 Mar  2 17:46 mnt -> mnt:[4026532517]lrwxrwxrwx 1 root root 0 Mar  2 17:46 ipc -> ipc:[4026532518]lrwxrwxrwx 1 root root 0 Mar  2 17:46 cgroup -> cgroup:[4026531835]
> looking at init process namespace -
> 
> test at ubuntu-16:~/audit$ sudo ls -latr  /proc/1/nstotal 0dr-xr-xr-x 9 root root 0 Mar  2 10:37 ..lrwxrwxrwx 1 root root 0 Mar  2 10:38 mnt -> mnt:[4026531840]dr-x--x--x 2 root root 0 Mar  2 10:38 .lrwxrwxrwx 1 root root 0 Mar  2 16:47 uts -> uts:[4026531838]lrwxrwxrwx 1 root root 0 Mar  2 16:47 user -> user:[4026531837]lrwxrwxrwx 1 root root 0 Mar  2 16:47 pid -> pid:[4026531836]lrwxrwxrwx 1 root root 0 Mar  2 16:47 net -> net:[4026531957]lrwxrwxrwx 1 root root 0 Mar  2 16:47 ipc -> ipc:[4026531839]lrwxrwxrwx 1 root root 0 Mar  2 16:47 cgroup -> cgroup:[4026531835]

After decoding your jumbled mess of output due to HTML and ls options
choices, the mount namespaces are different, which would completely
explain the problem.

> Can someone please suggest with some thoughts on how to make this work.

The pending container support mentioned by Steve is not yet complete and
some more of the coming changes may help with your issue, but start by
understanding that you are examining different filesystems with your
rules above.

> Thanks,Rakesh   

- RGB

--
Richard Guy Briggs <rgb at redhat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635