Question - Rule Syntax

[Bryan Jacobs]

Trevor,

Thank you for the information.  I have not had a chance to test it out yet
but this is what I ended up doing from your adviceŠ.

**** BEGIN SNIP RULES ****
## Ignore the Varonis account (to reduce audit noise)
-a always,exit -F path=/opt/varonis1.6.0106/bin/ls -F perm=x -F auid!=505
-F auid!=4294967295 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/bin/stat -F perm=x -F
auid!=505 -F auid!=4294967295 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/utils/vrns_all_accounts -F
perm=x -F auid!=505 -F auid!=4294967295 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/utils/vrns_diag.sh -F perm=x
-F auid!=505 -F auid!=4294967295 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/utils/vrns_local_accounts -F
perm=x -F auid!=505 -F auid!=4294967295 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/utils/vrns_stat -F perm=x -F
auid!=505 -F auid!=4294967295 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/vrns_mond -F perm=x -F
auid!=505 -F auid!=4294967295 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/vrns_statd -F perm=x -F
auid!=505 -F auid!=4294967295 -k privileged
## Apply the Varonis rules to everyone else with UID 500 and above
-a always,exit -F path=/opt/varonis1.6.0106/bin/ls -F perm=x -F auid>=500
-F auid!=4294967295 -F auid!=505 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/bin/stat -F perm=x -F
auid>=500 -F auid!=4294967295 -F auid!=505 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/utils/vrns_all_accounts -F
perm=x -F auid>=500 -F auid!=4294967295 -F auid!=505 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/utils/vrns_diag.sh -F perm=x
-F auid>=500 -F auid!=4294967295 -F auid!=505 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/utils/vrns_local_accounts -F
perm=x -F auid>=500 -F auid!=4294967295 -F auid!=505 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/utils/vrns_stat -F perm=x -F
auid>=500 -F auid!=4294967295 -F auid!=505 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/vrns_mond -F perm=x -F
auid>=500 -F auid!=4294967295 -F auid!=505 -k privileged
-a always,exit -F path=/opt/varonis1.6.0106/vrns_statd -F perm=x -F
auid>=500 -F auid!=4294967295 -F auid!=505 -k privileged
**** END SNIP RULES ****

Hope this works.



On 12/29/11 9:10 AM, "Trevor Vaughan" <peiriannydd at gmail.com> wrote:

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>I'm hoping to be told otherwise, but the cleanest and most maintainable
>way that I've seen to do this is to make two rules.
>
>First Rule: Ignore user 505
>Second Rule: Audit everyone
>
>Auditd should stop at the first rule matched. It does add more rules but
>seems to be the most stable across auditd versions.
>
>Also, that auid!=42... should probably be near the top of your rules
>since it will get hit the most and I'm assuming that you don't ever want
>to audit
>anonymous accesses to most items.
>
>Trevor
>
>On 12/22/2011 04:19 PM, Bryan Jacobs wrote:
>> All,
>> 
>> New auditd list member here.  I just started playing around with
>>auditd. I was wondering if someone might be kind enough to answer a
>>question I have.
>> I am attempting to create a rule that will audit privileged commands
>>for UID's greater than 500 but ignore one particular user that falls
>>under this
>> rule.  The user I am trying to ignore is the only user that should be
>>touching the file.
>> 
>> Below is the rule.
>> 
>> #### BEGIN RULE SNIP ####
>> 
>> ## Ensure auditd Collects Information on the Use of Privileged Commands
>> 
>> -a always,exit -F path=/opt/varonis1.6.0106/bin/ls -F perm=x -F
>> auid>=500 -F auid!=4294967295 -F auid!=505 -k privileged
>> 
>> #### END RULE SNIP ####
>> 
>> Is the rule syntax above correct?  If not how would I audit all users
>>with UID above 500 but still ignore one particular user?
>> 
>> 
>> Thank you and happy holidays,
>> 
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