看板FB_security
标 题RE: libarchive and MAC labels
发信站NCTU CS FreeBSD Server (Thu Jun 13 01:40:22 2013)
转信站ptt!csnews.cs.nctu!news.cs.nctu!.cs.nctucs.nctu!!freebsdfreebsd.org!ow
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> [email protected]
> Sent: Tuesday, 11 June 2013 1:10 AM
> To: [email protected]
> Subject: libarchive and MAC labels
>
> I've created a patch for libarchive that allows storing and
> restoring MAC labels from/to a multilabel filesystem using
> bsdtar. Now before going anywhere with this I had a few questions:
>
> - how much general interest is there in such a feature? Would
> this be a welcome addition to libarchive, either "upstream"
> or as integrated in the system source tree. I would be
> especially interested in the opinion of people who have
> already been involved with the MAC development.
>
> - right now the labels are stored silently, similar to ACL-s
> and extended attributes. They are not extracted by default,
> only when the '-p' option is specified (default as root).
> This seems consistent, however it would also be possible to
> add a switch so that the labels wouldn't be archived unless
> explicitly requested.
>
> - the labels are stored in text representation, as converted
> by mac_to_text(). This could potentially cause some future
> breakage, if the text representation ever changes. Also,
> restoring a label partially (let's say a biba+MLS label with
> only biba enabled) does not work. Any thoughts on that?
>
> Thanks,
> Priit.
> _______________________________________________
> [email protected] mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-security
> To unsubscribe, send any mail to
> "[email protected]"
Priit,
Thank-you for addressing a significant backup/recovery shortcoming.
I've used biba extensively, however if files/directories are backed-up with MLS+biba and recovered in a biba only environment, that
is the sysadmin choice. Warning messages are fine, but the restoration should continue (if possible).
Regards, Dewayne.
_______________________________________________
[email protected] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-security
To unsubscribe, send any mail to "
[email protected]"