linux-kernel - Re: [PATCH ghak46 V1] audit: normalize MAC

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Date:   Mon, 16 Apr 2018 16:25:19 +0200
From:   Ondrej Mosnacek <omosnace@...hat.com>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        SElinux list <selinux@...ho.nsa.gov>,
        Linux Security Module list 
        <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH ghak46 V1] audit: normalize MAC_STATUS record

2018-04-16 16:11 GMT+02:00 Richard Guy Briggs <rgb@...hat.com>:
> On 2018-04-16 09:26, Ondrej Mosnacek wrote:
>> 2018-04-10 1:34 GMT+02:00 Richard Guy Briggs <rgb@...hat.com>:
>> > There were two formats of the audit MAC_STATUS record, one of which was more
>> > standard than the other.  One listed enforcing status changes and the
>> > other listed enabled status changes with a non-standard label.  In
>> > addition, the record was missing information about which LSM was
>> > responsible and the operation's completion status.  While this record is
>> > only issued on success, the parser expects the res= field to be present.
>> >
>> > old enforcing/permissive:
>> > type=MAC_STATUS msg=audit(1523312831.378:24514): enforcing=0 old_enforcing=1 auid=0 ses=1
>> > old enable/disable:
>> > type=MAC_STATUS msg=audit(1523312831.378:24514): selinux=0 auid=0 ses=1
>> >
>> > List both sets of status and old values and add the lsm= field and the
>> > res= field.
>> >
>> > Here is the new format:
>> > type=MAC_STATUS msg=audit(1523293828.657:891): enforcing=0 old_enforcing=1 auid=0 ses=1 enabled=1 old-enabled=1 lsm=selinux res=1
>> >
>> > This record already accompanied a SYSCALL record.
>> >
>> > See: https://github.com/linux-audit/audit-kernel/issues/46
>> > Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
>> > ---
>> >  security/selinux/selinuxfs.c | 11 +++++++----
>> >  1 file changed, 7 insertions(+), 4 deletions(-)
>> >
>> > diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
>> > index 00eed84..00b21b2 100644
>> > --- a/security/selinux/selinuxfs.c
>> > +++ b/security/selinux/selinuxfs.c
>> > @@ -145,10 +145,11 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
>> >                 if (length)
>> >                         goto out;
>> >                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
>> > -                       "enforcing=%d old_enforcing=%d auid=%u ses=%u",
>> > +                       "enforcing=%d old_enforcing=%d auid=%u ses=%u"
>> > +                       " enabled=%d old-enabled=%d lsm=selinux res=1",
>>
>> This is just a tiny nit but why does "old_enforcing" use an underscore
>> and "old-enabled" a dash? Shouldn't the style be consistent across
>> fields?
>
> Yes, but my understanding is a preference for underscore, and not to
> change existing field names.

Ah, I just noticed that the field is already used elsewhere in the
code, so it makes sense to keep it the same. I thought at first that
it is just a typo.

>
> Steve?
>
>> Just my two cents...
>
> These details are worth noticing, thank you.
>
>> >                         new_value, selinux_enforcing,
>> >                         from_kuid(&init_user_ns, audit_get_loginuid(current)),
>> > -                       audit_get_sessionid(current));
>> > +                       audit_get_sessionid(current), selinux_enabled, selinux_enabled);
>> >                 selinux_enforcing = new_value;
>> >                 if (selinux_enforcing)
>> >                         avc_ss_reset(0);
>> > @@ -272,9 +273,11 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf,
>> >                 if (length)
>> >                         goto out;
>> >                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
>> > -                       "selinux=0 auid=%u ses=%u",
>> > +                       "enforcing=%d old_enforcing=%d auid=%u ses=%u"
>> > +                       " enabled=%d old-enabled=%d lsm=selinux res=1",
>> > +                       selinux_enforcing, selinux_enforcing,
>>
>> ^ also here
>>
>> >                         from_kuid(&init_user_ns, audit_get_loginuid(current)),
>> > -                       audit_get_sessionid(current));
>> > +                       audit_get_sessionid(current), 0, 1);
>> >         }
>> >
>> >         length = count;
>>
>> Ondrej Mosnacek <omosnace at redhat dot com>
>
> - RGB
>
> --
> Richard Guy Briggs <rgb@...hat.com>
> Sr. S/W Engineer, Kernel Security, Base Operating Systems
> Remote, Ottawa, Red Hat Canada
> IRC: rgb, SunRaycer
> Voice: +1.647.777.2635, Internal: (81) 32635

-- 
Ondrej Mosnacek <omosnace at redhat dot com>
Associate Software Engineer, Security Technologies
Red Hat, Inc.