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Re: buffer space



Unfortunately your 'test version' rules are being used in the production version releases of SECSCN.  As I mentioned before, those rules came from SECSCN version 4.3. Version 4.4 is now available but I strongly suspect that the rules are the same in both versions.  Even more unfortunate, many C&A reps demand 'compliance' with SECSCN recommendations and insist that those rules are implemented exactly as written.  My colleagues and I spend a lot of time, effort and (taxpayer) dollars trying to convince certifiers and accreditors that the rules as written are not appropriate for operational systems and must be modified to avoid adversely impacting functionality.

The law of unintended consequences demands that no good deed goes unpunished.  I appreciate whatever work you contributed to developing SECSCN I just wish there was some documentation, from an authoritative source, that instructed compliance personnel about the importance and necessity of customized configurations.

-Mike Nixon, CISSP
LTC Engineering Associates, Inc.

On Sun, Aug 23, 2009 at 12:32 AM, David Muran-de Assereto <dmuran tuad org> wrote:

On Aug 17, 2009, at 12:58 , Mike Nixon wrote:

Attached are is the audit.rules file from SECSCN 4.3.  There is a v4.4 now
available but I don't have it handy.  Also attached are two docs which
explain SECSCN's auditd configuration expectations.

-Mike


Yeah, the audit.rules that you have there is the test version that I hacked together more than two years ago as a "first cut".
It includes a lot of stuff which might or might have not been installed or needed, just on the off chance. The intent there was to discuss the rules requirements with your certifier, not to take them as gospel.
That stuff should have been reviewed some time ago. I will be glad to refer specific concerns or recommended fixes to the current development team.

Lenny, you should have dropped me a line about this thread. I only casually monitor this list, and happened upon it by chance.

Dave Muran-de Assereto


On Mon, Aug 17, 2009 at 11:34 AM, Norman Mark St. Laurent <
mstlaurent conceras com> wrote:

Hi David,

I too would like to know what version of SECSCAN you are using for the
"required watches".  I run the STIGS, SECSCAN, and a myriad of vulnerability
analysis tools (outside looking in -->  inside looking around) on systems
that I ISSE and provision.  I do not recall "required watches" that need to
be set with this tool, but I maybe off a version and I may need to visit
another sight to pick up the latest and greatest....

I know SECSCAN would like the System to be configured to HALT on audit
failure using the disk_ful_action_setting in /etc/audit/auditd.conf.  It
would also like the system to be configured to halt on audit disk error as
well as the audit data to be synchronously flushed to disk to avoid data
loss.  To do this (respectfully) I have set in my KickStarts and Satellite:

perl -npe 's/disk_full_action = SUSPEND/disk_full_action = HALT/' -i
/etc/audit/auditd.conf
perl -npe 's/disk_error_action = SUSPEND/disk_error_action = HALT/' -i
/etc/audit/auditd.conf
perl -npe 's/flush = INCREMENTAL/flush = SYNC/' -i /etc/audit/auditd.conf

Currently I set the /var/log/audit logs to rotate daily for 90 days...  in
/etc/logrotate.d/audit  and the capp.rules ; nispom.rules in
/usr/share/doc/audit* all work great and provide nice examples to comply
with Security Policy.

Because of the logrotation and the way aureport works, I have written a
wrapper script to be able to search and report all the log files.  Something
of this type would help the Security Officers look threw the log files.  The
script also keeps a pristine copy of the log files for investigation with
digital sigs to watch the tampering  (as well as aide) for investigation if
need be --> this keeps processing the files (MAC Times) and a pristine copy
separated.

I am very interested in finding our more about these set watches that are
required in SECSCAN.

Best regards,


Norman Mark St. Laurent
Conceras | Chief Technology Officer and ISSE



David Flatley wrote:


Thanks Steve!
If I were to move all the rotated logs to another directory, say
/home/logs. So instead of doing "ausearch -i" to capture all the information
in the rotated logs in
/var/log/audit directory. I would do "ausearch -i -f /home/logs" ,
correct?

Backlog is set to 12288 right now.


The SECSCAN requires many -w (watches) and a fair amount of syscalls. I
modified the syscalls to add your recommendation for using "arch=b32" and
"arch=b64".
Because I was getting errors restarting the auditd on some of their
recommendations one of which was mount?

Another setting I believe was doing me in was the log size is 20 megs and
I allow 8 rotated logs. But I had admin_disk_full set to 160 and the action
was suspend.
So this could have been tripping me up also.

I would like to be able to do the audit log extractions (ausearch and
aureport) when I get say 8 - 20 megs logs. I see I can do an exec on a
script in max_log_file_action.
So if I set the max_log_file to 160, I can then run a script to move the
rotated logs and process them, thus not stopping auditd and keeping things
working? I would set the
max rotated logs to 10 to allow the new rotated log space then move the
logs as you suggest.

Thanks.

David Flatley CISSP




Inactive hide details for Steve Grubb ---08/13/2009 02:29:34 PM---On
Thursday 13 August 2009 10:56:50 am David Flatley wrote: > Steve Grubb
---08/13/2009 02:29:34 PM---On Thursday 13 August 2009 10:56:50 am David
Flatley wrote: > Red Hat 5.3 running audit 1.7.7-6


From:

Steve Grubb <sgrubb redhat com>

To:
linux-audit redhat com

Cc:
David Flatley/Burlington/IBM IBMUS

Date:
08/13/2009 02:29 PM

Subject:
Re: buffer space




On Thursday 13 August 2009 10:56:50 am David Flatley wrote:
 Red Hat 5.3 running audit 1.7.7-6
Rotating logs at 20 megs and allowing 8 logs
Rules have watches and syscalls from the SECSCAN recommendations, and
have
added some of Steve Grubb's recommendations.

I would be curious what the SECSCAN recommendations are. Never heard of
it...


When we extract and archive the audit logs we get "Error receiving audit
netlink packet (No buffer space available) an "error sending signal info
request"
Our extract is: stop auditd then create a file and run ausearch -i >
file
then run an aureport -i > file then once that is done we delete all the
logs and restart auditd.

I think this is your problem. If you have audit rules loaded and stop
auditd,
then audit events are going to pile up in the queue waiting for auditd to
download them. At some point the kernel will decide auditd doesn't exist
and
will dump all events to syslog. This probably is not what you want either.

I would recommend calling "service auditd rotate" and then grab logs
audit.log.1 -> audit.logs.7 and move them away to another directory for
post  processing the contents.

You may also want to check you backlog size settings too.


If I run this manually it works fine but if I have it running it in a
cron
we get Kernel panics, lockups and log data loss plus the buffer
messages.

Shouldn't really make a difference.

-Steve


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David Muran-de Assereto
dmuran tuad org

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