linux-kernel - Re: [RFC] Create an audit record of USB specific details

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Message-ID: <CALJHwhSaimur4w_WqjNOV6dawuDTvqQ5KGM52741Hq=DYMHaAQ@mail.gmail.com>
Date:	Tue, 5 Apr 2016 11:54:07 +1000
From:	Wade Mealing <wmealing@...hat.com>
To:	Greg KH <greg@...ah.com>
Cc:	Steve Grubb <sgrubb@...hat.com>, linux-audit@...hat.com,
	linux-usb <linux-usb@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Create an audit record of USB specific details

That is a good question, maybe I've been lucky in the devices that I have
been testing with.  Most of them seem to be ascii, my assumption was that
shouldn't be a problem.  The same encoding   function used by the path
audit_log_d_path, definitely audits UTF8 named files:

# ausearch -i -f /tmp/test/권성주.txt

type=PATH msg=audit(04/04/16 21:05:00.521:1638) : item=0 name=/tmp/권성주.txt
inode=627534 dev=fd:00 mode=file,664 ouid=wmealing ogid=wmealing rdev=00:00
obj=unconfined_u:object_r:user_tmp_t:s0 objtype=NORMAL

# ausearch -f  /tmp/test/권성주.txt

type=PATH msg=audit(1459818300.521:1638): item=0
name=2F746D702FEAB68CEC84B1ECA3BC2E747874 inode=627534 dev=fd:00
mode=0100664 ouid=1000 ogid=1000 rdev=00:00
obj=unconfined_u:object_r:user_tmp_t:s0 objtype=NORMAL

Thanks,

Wade Mealing.

On Tue, Apr 5, 2016 at 11:51 AM, Wade Mealing <wmealing@...hat.com> wrote:
> That is a good question, maybe I've been lucky in the devices that I have
> been testing with.  Most of them seem to be ascii, my assumption was that
> shouldn't be a problem.  The same encoding   function used by the path
> audit_log_d_path, definitely audits UTF8 named files:
>
> # ausearch -i -f /tmp/test/권성주.txt
>
> type=PATH msg=audit(04/04/16 21:05:00.521:1638) : item=0 name=/tmp/권성주.txt
> inode=627534 dev=fd:00 mode=file,664 ouid=wmealing ogid=wmealing rdev=00:00
> obj=unconfined_u:object_r:user_tmp_t:s0 objtype=NORMAL
>
> # ausearch -f  /tmp/test/권성주.txt
>
> type=PATH msg=audit(1459818300.521:1638): item=0
> name=2F746D702FEAB68CEC84B1ECA3BC2E747874 inode=627534 dev=fd:00
> mode=0100664 ouid=1000 ogid=1000 rdev=00:00
> obj=unconfined_u:object_r:user_tmp_t:s0 objtype=NORMAL
>
> Thanks,
>
> Wade Mealing.
>
> On Tue, Apr 5, 2016 at 7:54 AM, Greg KH <greg@...ah.com> wrote:
>>
>> On Mon, Apr 04, 2016 at 05:37:01PM -0400, Steve Grubb wrote:
>> > On Monday, April 04, 2016 12:02:42 AM wmealing wrote:
>> > > I'm looking to create an audit trail for when devices are added or
>> > > removed
>> > > from the system.
>> > >
>> > > The audit subsystem is a logging subsystem in kernel space that can be
>> > > used to create advanced filters on generated events.  It has partnered
>> > > userspace utilities ausearch, auditd, aureport, auditctl which work
>> > > exclusively on audit records.
>> > >
>> > > These tools are able to set filters to "trigger" on specific in-kernel
>> > > events specified by privileged users.  While the userspace tools can
>> > > create
>> > > audit events these are not able to be handled intelligently
>> > > (decoded,filtered or ignored) as kernel generated audit events are.
>> > >
>> > > I have this working at the moment with the USB subsystem (as an
>> > > example).
>> > > Its been suggested that I use systemd-udev however this means that the
>> > > audit
>> > > tools (ausearch) will not be able to index these records.
>> > >
>> > > Here is an example of picking out the AUDIT_DEVICE record type for
>> > > example.
>> > >
>> > > > # ausearch -l -i -ts today -m AUDIT_DEVICE
>> > > > ----
>> > > > type=AUDIT_DEVICE msg=audit(31/03/16 16:37:15.642:2) : action=add
>> > > > manufacturer=Linux 4.4.0-ktest ehci_hcd product=EHCI Host Controller
>> > > > serial=0000:00:06.7 major=189 minor=0 bus="usb"
>> >
>> > About this event's format...we can't have any spaces in the value side
>> > of the
>> > name=value fields unless its encoded as an untrusted string. You can
>> > replace
>> > spaces with an underscore or dash for readability. So, manufacturer and
>> > product would need this treatment.
>>
>> What is the character encoding that audit messages can accept?  Does it
>> match up with the character encoding that USB strings are in?
>>
>> thanks,
>>
>> greg k-h
>
>