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Re: Captured system calls that should be filtered out



Hi,

Try auid!=4294967295 instead of auid!=4294967296.

Regards,
Marcelo

On 01/20/2012 02:27 PM, Kaplan, Eric D (IS) wrote:
I am trying to implement STIG rules for our system. I modified Steve Grubbs' stig.rules for my audit.rules file. Included
was the rule
-a exit,always -F arch=b64 -S chmod -S fchmod -F auid>=500 -F auid!=4294967296 -k perm_mod which I understand should exempt root and unset processes from having these system calls captured. Yet
in our audit.logs there was a torrent of records of the sort
type=SYSCALL msg=audit(1326897520.970:2005250): arch=c000003e syscall=91 per=400000 success=yes exit=0 a0=1 a1=100 a2=0 a3=7fff21800870 items=1 ppid=3536 pid=20965 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="time_adjust.ksh" exe="/bin/ksh93" key="perm_mod" type=PATH msg=audit(1326897520.970:2005250): item=0 name=(null) inode=25631356 dev=00:05 mode=0140777 ouid=0 ogid=0 rdev=00:00
and
type=SYSCALL msg=audit(1326897480.144:2005238): arch=c000003e syscall=91 per=400000 success=yes exit=0 a0=5 a1=100 a2=0 a3=7fffa8f157d0 items=1 ppid=20707 pid=20726 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="find_client_sta" exe="/bin/ksh93" key="perm_mod" type=PATH msg=audit(1326897480.144:2005238): item=0 name=(null) inode=25630808 dev=00:05 mode=0140777 ouid=0 ogid=0 rdev=00:00 I need to get rid of them to make annalysis possible and to avoid soaking up disk space. find_client_status.ksh and time_adjust.ksh are both scripts that are spawned by a daemon running as root.
I attach my version of audit.rules.


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