On 24/04/12 18:37, Daniel J Walsh wrote:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 04/24/2012 01:16 PM, Tim Sheppard wrote:
Hi,
I am looking to use SELinux to secure a process that is made up of a number
of discrete, sequential stages. One stage communicates to the next by
writing results to a file and then an external process modifies the SELinux
context of the file to allow the next stage to read the file and so on
until the final stage is reached and the processing stops.
The problem I have is that the number of stages is variable and can change
with each invocation of the process, i.e. when I create the process I know
the number of stages that will be required in it, but the number of stages
could change with each invocation. I think therefore, that I need a means
of creating new contexts on the fly and assigning them to the processes. Is
it possible with SELinux to create a new security context (domain for the
output file, and user/role for the stage process) on the fly and execute a
process within that context such that it could poll a directory for input
files and, if it is permitted to read the file perform its operation?
Many Thanks,
Tim Sheppard
If each process is going to require the same approximate access. I would use
MCS labeling for separation.
Basically define a sandbox type for your processes to run within and then have
your controlling app pick an MCS label for the process and the content.
chcon -t confined_file_t -l s0:c1 passing.file
runcon -t confined_proc_t -l s0:c1 proc1
When done
chcon -l s0:c2 passing.file
runcon -t confined_proc_t -l s0:c2 proc2
...
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
iEYEARECAAYFAk+W5O4ACgkQrlYvE4MpobNfcgCdHfJl2HRNfsi3YsAou1lA4MY9
gfIAoNzG8u5W3o9f7LUAixBSxvaLyXyE
=iHPC
-----END PGP SIGNATURE-----
Daniel,
Many Thanks, I'll look into MCS a bit more then. The other requirement I
have to to be able to do this all programatically with C/C++ rather than
via bash. I assume that as there is a bash command there are comparable
function calls?
Cheers,
Tim
This email and any attachments to it may be confidential and are
intended solely for the use of the individual to whom it is addressed.
If you are not the intended recipient of this email, you must neither
take any action based upon its contents, nor copy or show it to anyone.
Please contact the sender if you believe you have received this email in
error. QinetiQ may monitor email traffic data and also the content of
email for the purposes of security. QinetiQ Limited (Registered in
England & Wales: Company Number: 3796233) Registered office: Cody Technology
Park, Ively Road, Farnborough, Hampshire, GU14 0LX http://www.qinetiq.com.
--
selinux mailing list
selinux@xxxxxxxxxxxxxxxxxxxxxxx
https://admin.fedoraproject.org/mailman/listinfo/selinux
