Thanks Kyle. I've deliberately not provided the entire picture. I'm aware of memory residency and of in-flight encryption issues. Theses are less of a problem for us. For me, it's a question of finding a reliably encrypted, OSS, at-rest setup which involves Ceph and preferably ZFS for flexibility. M On 2014 Mar 10, at 21:04, Kyle Bader wrote:
>> Ceph is seriously badass, but my requirements are to create a cluster in >> which I can host my customer's data in separate areas which are >> independently encrypted, with passphrases which we as cloud admins do not >> have access to. >> >> My current thoughts are: >> 1. Create an OSD per machine stretching over all installed disks, then >> create a user-sized block device per customer. Mount this block device on >> an access VM and create a LUKS container in to it followed by a zpool and >> then I can allow the users to create separate bins of data as separate ZFS >> filesystems in the container which is actually a blockdevice striped across >> the OSDs. >> 2. Create an OSD per customer and use dm-crypt, then store the dm-crypt key >> somewhere which is rendered in some way so that we cannot access it, such as >> a pgp-encrypted file using a passphrase which only the customer knows. > >> My questions are: >> 1. What are people's comments regarding this problem (irrespective of my >> thoughts) > > What is the threat model that leads to these requirements? The story > "cloud admins do not have access" is not achievable through technology > alone. > >> 2. Which would be the most efficient of (1) and (2) above? > > In the case of #1 and #2, you are only protecting data at rest. With > #2 you would need to decrypt the key to open the block device, and the > key would remain in memory until it is unmounted (which the cloud > admin could access). This means #2 is safe so long as you never mount > the volume, which means it's utility is rather limited (archive > perhaps). Neither of these schemes buy you much more than the > encryption handling provided by ceph-disk-prepare (dmcrypted osd > data/journal volumes), the key management problem becomes more acute, > eg. per tenant. > > -- > > Kyle _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
