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SubjectRe: [PATCH ghak46 V1] audit: normalize MAC_STATUS record
On Tue, Apr 17, 2018 at 6:09 PM, Richard Guy Briggs <rgb@redhat.com> wrote:
> On 2018-04-17 17:59, Paul Moore wrote:
>> On Wed, Apr 11, 2018 at 5:08 PM, Paul Moore <paul@paul-moore.com> wrote:
>> > On Mon, Apr 9, 2018 at 7:34 PM, Richard Guy Briggs <rgb@redhat.com> wrote:
>> >> 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@redhat.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",
>> >> 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);
>> >
>> > This looks fine.
>> >
>> >> 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,
>> >> from_kuid(&init_user_ns, audit_get_loginuid(current)),
>> >> - audit_get_sessionid(current));
>> >> + audit_get_sessionid(current), 0, 1);
>> >
>> > It needs to be said again that I'm opposed to changes like this:
>> > inserting new fields, removing fields, or otherwise changing the
>> > format in ways that aren't strictly the addition of new fields to the
>> > end of a record is a Bad Thing. However, there are exceptions (there
>> > are *always* exceptions), and this seems like a reasonable change that
>> > shouldn't negatively affect anyone.
>> >
>> > I'll merge this once the merge window comes to a close (we are going
>> > to need to base selinux/next on v4.17-rc1).
>>
>> Merged into selinux/next, although I should mention that there were
>> some actual code changes because of the SELinux state consolidation
>> patches that went into v4.17. The changes were small but please take
>> a look and make sure everything still looks okay to you.
>
> Ok, that was a bit disruptive, but looks ok to me.

Yes, it was a pretty big change, but it sets the stage for a few
things we are trying to do with SELinux.

Regardless, thanks for giving the merge a quick look.

--
paul moore
www.paul-moore.com

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