Hi Steve,
Do you know if there is a way to detect if you're running on a system that
has not been compiled with 32-bit support?
SIMP is automatically generating the 32/64 split based on whether or not
you're on a 32 or 64-bit platform but I haven't encountered the situation
that you mentioned in the wild and would like to be able to handle it
properly.
Reference:
https://github.com/simp/pupmod-simp-auditd
Thanks,
Trevor
On Tue, Oct 27, 2015 at 11:29 AM, Steve Grubb <sgrubb(a)redhat.com> wrote:
On Tuesday, October 27, 2015 10:00:07 AM Robert Jacobson wrote:
> I've recently been trying to reconcile the audit.rules on my systems vs.
> the scap-security-guide, and I'm confused about the ARCH rules.
Right. I sent feedback internally to the project to tell them that what is
written is not efficient and not clear. That section is being re-written.
> When is it required to check both 32- and 64-bit architectures?
Whenever you have a system that is bi-arch. That would commonly be 64 bit
systems. But it is possible to compile 64 bit kernels that have no 32 bit
ABI.
> e.g. the guide says both 32- and 64-bit rules are required to check for
> unauthorized access attempts:
That is a fact. The stig.rules shipped in the audit package is an accurate
starting point for 64 bit systems needing stig compliance.
> # Unauthorized Access attempts
(audit_rules_unsuccessful_file_modification)
> -a always,exit -F arch=b32 -S creat -S open -S openat -S
> open_by_handle_at -S truncate -S ftruncate -F exit=-EACCES -F auid>=500
> -F auid!=4294967295 -k access
> -a always,exit -F arch=b32 -S creat -S open -S openat -S
> open_by_handle_at -S truncate -S ftruncate -F exit=-EPERM -F auid>=500
> -F auid!=4294967295 -k access
> -a always,exit -F arch=b64 -S creat -S open -S openat -S
> open_by_handle_at -S truncate -S ftruncate -F exit=-EACCES -F auid>=500
> -F auid!=4294967295 -k access
> -a always,exit -F arch=b64 -S creat -S open -S openat -S
> open_by_handle_at -S truncate -S ftruncate -F exit=-EPERM -F auid>=500
> -F auid!=4294967295 -k access
This looks correct assuming that real users start at 500. That number needs
adjusting up if you start users at a higher number.
> But for modifying the network environment, only the 64-bit rule is
required:
>
> # Network changes ( audit_rules_networkconfig_modification )
> -a always,exit -F arch=b64 -S sethostname -S setdomainname -k
> audit_rules_networkconfig_modification
A 32 bit rule is also needed.
> I don't understand why the 32-bit check is required for open() calls but
> not sethostname() calls?
Its a mistake. I am working with them to correct the SSG and it has
problems
beyond auditing. But its being patched quickly and should be ready to use
soon.
-Steve
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Trevor Vaughan
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