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[solved] LUKS encrypted disk on a virtual private server
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Elleni
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PostPosted: Mon Nov 16, 2015 7:24 am    Post subject: [solved] LUKS encrypted disk on a virtual private server Reply with quote

Hi all,

I am installing gentoo on a Server, which is a hosted vps. Thats why I am installing it on a luks encrypted drive. But what if the hoster takes a snapshot while the vm is running. Will he be able to see all data of the virtual harddisk, or does encryption prevent them from accessing the data on this Setup?

Thanks for clarifying. :)


Last edited by Elleni on Mon Nov 16, 2015 8:23 pm; edited 1 time in total
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szatox
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PostPosted: Mon Nov 16, 2015 5:21 pm    Post subject: Reply with quote

Snapshot of a hard drive is not a big deal. Things are getting more funny when you notice they also have full access to RAM that does not reside on LUKS.
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frostschutz
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PostPosted: Mon Nov 16, 2015 5:35 pm    Post subject: Reply with quote

If you don't trust your hoster the encryption is broken. Virtualization gives easy access to keys in RAM.
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Elleni
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PostPosted: Mon Nov 16, 2015 8:22 pm    Post subject: Reply with quote

Thanks guys for clarifiying, so Luks encryption does not make sense in this case. Thanks for pointing that out. :)
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frostschutz
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PostPosted: Mon Nov 16, 2015 8:31 pm    Post subject: Reply with quote

Elleni wrote:
Luks encryption does not make sense in this case


It depends on why you want disk encryption. The hoster dumping your RAM to get keys is a very specialized scenario.

Encryption still helps in the case that your hoster sells broken HDDs on Ebay (or puts one in another costumer's server by accident). It also might help in case of bugs in the virtualisation solution that might give neighboring VMs physical access to your disk.
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Elleni
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PostPosted: Wed Nov 18, 2015 1:12 am    Post subject: Reply with quote

Hi frostschutz,

thank you for pointing that out. Having setup diskencryption including encryption of boot I enjoy my vps and I do keep in mind the limitations mentioned here :)
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