getuid() vs. geteuid() in auditctl
Peter Moody
pmoody at google.com
Wed Mar 21 16:38:06 UTC 2012
On Tue, Mar 20, 2012 at 11:07 AM, Steve Grubb <sgrubb at redhat.com> wrote:
> On Friday, March 16, 2012 05:50:56 PM Peter Moody wrote:
>> line 1162 in auditctl.c has this:
>>
>> #ifndef DEBUG
>> /* Make sure we are root */
>> if (getuid() != 0) {
>> fprintf(stderr, "You must be root to run this program.\n");
>> return 4;
>> }
>> #endif
>>
>> Is there any particular reason to use getuid() there as opposed to
>> geteuid()?
>
> I suppose it doesn't matter. I never envisioned having a helper application, so
> that why its the way it is. Since we are optionally linking in libcap-ng, I
> suppose we could even check the capability rather than the euid.
Just the CAP_AUDIT_CONTROL capability?
> Also note that
> for certification purposes the file permissions are restricted.
The permissions of the auditctl binary?
> -Steve
>
>> In my particular case, we have a setuid helper that allows
>> a normal user to run 'auditctl -l' (with a clean environment), and
>> this prevents the setuid helper from working.
--
Peter Moody Google 1.650.253.7306
Security Engineer pgp:0xC3410038
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