Filtering Connect syscalls for af_inet only

[F Rafi]

Correction. Both filetype=socket and !=socket result in just saddr=0100..
events. Seems like this is not the way to go.

Farhan

On Tue, Feb 3, 2015 at 6:24 PM, F Rafi <farhanible at gmail.com> wrote:

> Sorry, I should have mentioned that I already tried that. That results in
> no logs being generated for that rule.
>
> Thanks,
> Farhan
>
> On Tue, Feb 3, 2015 at 6:21 PM, Peter Moody <pmoody at google.com> wrote:
>
>>
>> On Tue, Feb 03 2015 at 14:57, F Rafi wrote:
>> > Hi folks,
>> >
>> > <n00b alert>
>> >
>> > I have auditing for outbound connect requests working using the Connect
>> > (sys_connect) syscall on a server running *Ubuntu precise 12.04 LTS*.
>> >
>> > The rule I'm using is:
>> >
>> > -a exit,always -F arch=b64 -S connect -k network_outbound
>> >
>> >
>> >
>> > I'm getting a substantial amount of saddr=0100.... logs, which I
>> understand
>> > are not  connections to a remote host but rather a local AF_UNIX socket
>> > pointing to a file. Example log message is:
>> >
>> >
>> >
>> > type=SYSCALL msg=audit(1423002916.796:24545371): arch=c000003e
>> syscall=42
>> >> success=no exit=-2 a0=294 a1=7fff97f62680 a2=6e a3=7fff97f62860 items=0
>> >> ppid=20546 pid=21439 auid=4294967295 uid=33 gid=33 euid=33 suid=33
>> fsuid=33
>> >> egid=33 sgid=33 fsgid=33 tty=(none) ses=4294967295 comm="apache2"
>> >> exe="/usr/lib/apache2/mpm-prefork/apache2" key="network_outbound"
>> >
>> > type=SOCKADDR msg=audit(1423002916.796:24545371):
>> *saddr=0100*<truncated to
>> >> remove the hex-encoded file path>
>> >
>> >
>> > Is there an easy way to filter these out so that we only have
>> saddr=0200...
>> > messages left?
>> >
>> > I'm exporting the log to an external syslog server and it would help
>> > considerably if I could eliminate this from all of our servers.
>> >
>> > I see that auditctl has a *filetype* filter which can be set to filter
>> > *socket* or *file* types. Is that the right way to filter these
>> messages?
>> >
>> > -a exit,always -F arch=b64 -F filetype=socket -S connect -k
>> network_outbound
>>
>> does -F filetype!=socket work?
>>
>> > The above rule filters out everything but the af_unix connect syscalls,
>> > which is the opposite of what I'm looking for.
>> >
>> > Any help would be appreciated.
>> >
>> > Thanks,
>> > Farhan
>> > --
>> > Linux-audit mailing list
>> > Linux-audit at redhat.com
>> > https://www.redhat.com/mailman/listinfo/linux-audit
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/linux-audit/attachments/20150203/d339322e/attachment.htm>