Re: Identify whether the kernel version supports Path based exclusion

From: Steve Grubb <sgrubb@redhat.com>
To: Linux-audit@redhat.com, linux-audit@redhat.com
Cc: avtanshgupta1995@gmail.com
Subject: Re: Identify whether the kernel version supports Path based exclusion
Date: Tue, 10 Jan 2023 10:15:58 -0500	[thread overview]
Message-ID: <5902815.lOV4Wx5bFT@x2> (raw)
In-Reply-To: <CAPoNrttQd+ieQ+B93SbrbiPjppRoiyT_a+7FpiRdQNGQ2ApiXQ@mail.gmail.com>

Hello,

On Tuesday, January 10, 2023 7:08:12 AM EST Anurag Aggarwal wrote:
> I need a method to identify whether the audid version a kernel is running
> supports path based exclusions.

It's not dependant on auditd. The kernel itself decides if a rule is valid.

> One option would be to use audit_add_rule_data to add a temporary path
> based rule and check if it is successful, but this won't work when auditd
> is running in immutable mode.
> 
> Any other way which does not require checking versions of Kernel or
> Distribution?

If you are looking to see if this is supported

-a always,exclude  -F exec=/usr/bin/ls

then it can be detected by:

uint32_t features = audit_get_features();
if ((features & AUDIT_FEATURE_BITMAP_EXCLUDE_EXTEND) == 0)
    puts("not supported");
else
    puts("supported");

-Steve

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