linux-kernel - Re: [PATCH v4 2/2] selinux: add basic filtering for audit trace events

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Date:   Fri, 21 Aug 2020 11:35:24 -0400
From:   Stephen Smalley <stephen.smalley.work@...il.com>
To:     Thiébaud Weksteen <tweek@...gle.com>
Cc:     Paul Moore <paul@...l-moore.com>, Nick Kralevich <nnk@...gle.com>,
        Peter Enderborg <peter.enderborg@...y.com>,
        Eric Paris <eparis@...isplace.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        SElinux list <selinux@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] selinux: add basic filtering for audit trace events

On Fri, Aug 21, 2020 at 10:09 AM Thiébaud Weksteen <tweek@...gle.com> wrote:
>
> From: Peter Enderborg <peter.enderborg@...y.com>
>
> This patch adds further attributes to the event. These attributes are
> helpful to understand the context of the message and can be used
> to filter the events.
>
> There are three common items. Source context, target context and tclass.
> There are also items from the outcome of operation performed.
>
> An event is similar to:
>            <...>-1309  [002] ....  6346.691689: selinux_audited:
>        requested=0x4000000 denied=0x4000000 audited=0x4000000
>        result=-13
>        scontext=system_u:system_r:cupsd_t:s0-s0:c0.c1023
>        tcontext=system_u:object_r:bin_t:s0 tclass=file
>
> With systems where many denials are occurring, it is useful to apply a
> filter. The filtering is a set of logic that is inserted with
> the filter file. Example:
>  echo "tclass==\"file\" " > events/avc/selinux_audited/filter
>
> This adds that we only get tclass=file.
>
> The trace can also have extra properties. Adding the user stack
> can be done with
>    echo 1 > options/userstacktrace
>
> Now the output will be
>          runcon-1365  [003] ....  6960.955530: selinux_audited:
>      requested=0x4000000 denied=0x4000000 audited=0x4000000
>      result=-13
>      scontext=system_u:system_r:cupsd_t:s0-s0:c0.c1023
>      tcontext=system_u:object_r:bin_t:s0 tclass=file
>           runcon-1365  [003] ....  6960.955560: <user stack trace>
>  =>  <00007f325b4ce45b>
>  =>  <00005607093efa57>
>
> Signed-off-by: Peter Enderborg <peter.enderborg@...y.com>
> Reviewed-by: Thiébaud Weksteen <tweek@...gle.com>

Acked-by: Stephen Smalley <stephen.smalley.work@...il.com>