Re: audit watch rules and docker containers
Hi Richard,
Thanks for reviewing the email and my apologies for the formatting issue. This response
corrects that.
I looked at Steve's response (with the embedded link) and have also followed your
presentation on youtube however I am not clear on the proposed change(s) which will allow
the mnt space to be shared between the host and the privileged container. Is this use case
even being considered?
Thanks,
Rakesh
________________________________
From: Richard Guy Briggs <rgb(a)redhat.com>
To: Rakesh <raksac(a)yahoo.com>
Cc: "linux-audit(a)redhat.com" <linux-audit(a)redhat.com>
Sent: Sunday, March 4, 2018 11:14 PM
Subject: Re: audit watch rules and docker containers
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@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@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(a)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