Re: [zfs-discuss] ZFS 'secure erase'

2010-02-08 Thread Miles Nordin
nw == Nicolas Williams nicolas.willi...@sun.com writes: ch == c hanover chano...@umich.edu writes: Trying again: ch In our particular case, there won't be ch snapshots of destroyed filesystems (I create the snapshots, ch and destroy them with the filesystem). Right, but if your

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-07 Thread Darren J Moffat
On 05/02/2010 21:46, Nicolas Williams wrote: On Fri, Feb 05, 2010 at 04:41:08PM -0500, Miles Nordin wrote: ch == c hanoverchano...@umich.edu writes: ch is there a way to a) securely destroy a filesystem, AIUI zfs crypto will include this, some day, by forgetting the key. Right.

[zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread c.hanover
Two things, mostly related, that I'm trying to find answers to for our security team. Does this scenario make sense: * Create a filesystem at /users/nfsshare1, user uses it for a while, asks for the filesystem to be deleted * New user asks for a filesystem and is given /users/nfsshare2. What

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread Frank Cusack
On 2/5/10 3:49 PM -0500 c.hanover wrote: Two things, mostly related, that I'm trying to find answers to for our security team. Does this scenario make sense: * Create a filesystem at /users/nfsshare1, user uses it for a while, asks for the filesystem to be deleted * New user asks for a

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread Miles Nordin
ch == c hanover chano...@umich.edu writes: ch is there a way to a) securely destroy a filesystem, AIUI zfs crypto will include this, some day, by forgetting the key. but for SSD, zfs above a zvol, or zfs above a SAN that may do snapshots without your consent, I think it's just logically

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread Nicolas Williams
On Fri, Feb 05, 2010 at 03:49:15PM -0500, c.hanover wrote: Two things, mostly related, that I'm trying to find answers to for our security team. Does this scenario make sense: * Create a filesystem at /users/nfsshare1, user uses it for a while, asks for the filesystem to be deleted * New

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread Nicolas Williams
On Fri, Feb 05, 2010 at 04:41:08PM -0500, Miles Nordin wrote: ch == c hanover chano...@umich.edu writes: ch is there a way to a) securely destroy a filesystem, AIUI zfs crypto will include this, some day, by forgetting the key. Right. but for SSD, zfs above a zvol, or zfs above a

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread c.hanover
In our particular case, there won't be snapshots of destroyed filesystems (I create the snapshots, and destroy them with the filesystem). I'm not too sure on the particulars of NFS/ZFS, but would it be possible to create a 1GB file without writing any data to it, and then use a hex editor to

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread Frank Cusack
On 2/5/10 5:08 PM -0500 c.hanover wrote: would it be possible to create a 1GB file without writing any data to it, and then use a hex editor to access the data stored on those blocks previously? No, not over NFS and also not locally. You'd be creating a sparse file, which doesn't allocate

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread Nicolas Williams
On Fri, Feb 05, 2010 at 05:08:02PM -0500, c.hanover wrote: In our particular case, there won't be snapshots of destroyed filesystems (I create the snapshots, and destroy them with the filesystem). OK. I'm not too sure on the particulars of NFS/ZFS, but would it be possible to create a 1GB

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread c.hanover
On Feb 5, 2010, at 5:19 PM, Nicolas Williams wrote: ZFS crypto will be nice when we get either NFSv4 or NFSv3 w/krb5 for over the wire encryption. Until then, not much point. You can use NFS with krb5 over the wire encryption _now_. Nico -- I know, that's just something I'm working

Re: [zfs-discuss] ZFS 'secure erase'

2010-02-05 Thread Frank Cusack
You might also want to note that with traditional filesystems, the 'shred' utility will securely erase data, but no tools like that will work for zfs. ___ zfs-discuss mailing list zfs-discuss@opensolaris.org