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Bug 1993826 - content_rule_audit_basic_configuration enforces using default buffer size (8192) for audit, which isn't always suitable on busy systems
Summary: content_rule_audit_basic_configuration enforces using default buffer size (81...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: scap-security-guide
Version: 8.4
Hardware: All
OS: Linux
low
low
Target Milestone: rc
: ---
Assignee: Vojtech Polasek
QA Contact: Milan Lysonek
Khushbu Borole
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-08-16 08:08 UTC by Renaud Métrich
Modified: 2022-05-10 14:42 UTC (History)
7 users (show)

Fixed In Version: scap-security-guide-0.1.60-1.el8
Doc Type: Enhancement
Doc Text:
.SCAP rules now have a warning message to configure Audit log buffer for large systems The SCAP rule `xccdf_org.ssgproject.content_rule_audit_basic_configuration` now displays a performance warning that suggests users of large systems where the Audit log buffer configured by this rule might be too small and can override the custom value. The warning also describes the process to configure a larger Audit log buffer. With this enhancement, users of large systems can stay compliant and have their Audit log buffer set correctly.
Clone Of:
Environment:
Last Closed: 2022-05-10 14:14:34 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-93570 0 None None None 2021-08-16 08:09:15 UTC
Red Hat Product Errata RHBA-2022:1900 0 None None None 2022-05-10 14:14:44 UTC

Description Renaud Métrich 2021-08-16 08:08:07 UTC 
This bug was initially created as a copy of Bug #1993822

I am copying this bug because: 

Also applies on RHEL8

Description of problem:

The content_rule_audit_basic_configuration rule enforces having 10-basic-config.rules be the default configuration file, which sets internally the buffer to 8192:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
[...]
## Increase the buffers to survive stress events.
## Make this bigger for busy systems
-b 8192
[...]
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------

If the customer changes the value, the rule will fail. In theory the check should only make sure that the buffer is larger or equal to 8192.


Version-Release number of selected component (if applicable):

scap-security-guide-0.1.54-5.el8.noarch

How reproducible:

Always

Steps to Reproduce:
1. Modify /etc/audit/rules.d/10-basic-config.rules to increase the buffer to 16384
2. Execute xccdf_org.ssgproject.content_rule_audit_basic_configuration rule

Actual results:

Fails

Expected results:

Pass

Additional info:

Workaround is to create his own 99-custom.rules or similar file that modifies the buffer size
Comment 1 Renaud Métrich 2021-08-16 08:16:54 UTC 
If you consider not changing the rule implementation to check for minimum settings instead of just comparing file contents, then please amend the 10-basic-config.rules template to tell customers not to modify the setting in that file but create another file alphanumerically sorted after this file that contains the custom setting, something like this:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
[...]
## Increase the buffers to survive stress events.
## Make this bigger for busy systems
## Don't modify the below value but create a file alphanumerically higher than
## "10-basic-config.rules" redefining the value, e.g. "99-custom-config.rules"
-b 8192
[...]
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
Comment 2 Vojtech Polasek 2021-08-30 12:52:29 UTC 
Hello,
thank you for raising this issue. This particular rule treats the file as one huge blob, so it can't be easily customized. The idea behind the rule is to match files provided by Audit package in /usr/share/audit/sample-rules.
Therefore, if we were about to add some explaining comment, I believe this would need to be coordinated with Audit developers as well, so that copying over the sample file does not make the rule fail.
However, I think we could add the explanation either to the rule description or into the rule warning section related to performance, I like the later approach more. This would bee modification only to the SCAP content. It would be visible in the HTML report and in the HTML guides.
Would this be feasible?
Comment 5 Vojtech Polasek 2022-01-10 09:49:35 UTC 
Fixed upstream: https://github.com/ComplianceAsCode/content/pull/7909/files
Comment 18 errata-xmlrpc 2022-05-10 14:14:34 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (scap-security-guide bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:1900
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