linux-kernel - Re: [PATCH v32 12/21] x86/sgx: Add provisioning

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Message-ID: <20200616200340.GB10412@linux.intel.com>
Date:   Tue, 16 Jun 2020 23:03:40 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Darren Kenny <darren.kenny@...cle.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-security-module@...r.kernel.org,
        Jethro Beekman <jethro@...tanix.com>,
        Andy Lutomirski <luto@...nel.org>, akpm@...ux-foundation.org,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com, bp@...en8.de,
        cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, nhorman@...hat.com,
        npmccallum@...hat.com, puiterwijk@...hat.com, rientjes@...gle.com,
        sean.j.christopherson@...el.com, tglx@...utronix.de,
        yaozhangx@...gle.com
Subject: Re: [PATCH v32 12/21] x86/sgx: Add provisioning

On Tue, Jun 16, 2020 at 10:55:11PM +0300, Jarkko Sakkinen wrote:
> On Fri, Jun 05, 2020 at 09:09:49PM +0100, Darren Kenny wrote:
> > TYPO: s/devilering/delivering/?
> 
> I decided to rewrite the whole thing:
> 
>   x86/sgx: Allow a limited use of ATTRIBUTE.PROVISIONKEY for attestation
> 
>   Provisioning Certification Enclave (PCE), the root of trust for other
>   enclaves, generates a signing key from a fused key called Provisioning
>   Certification Key. PCE can then use this key to certify an attestation key
>   of a QE, e.g. we get the chain of trust down to the hardware if the Intel
>   signed PCE is used.
> 
>   To use the needed keys, ATTRIBUTE.PROVISIONKEY is required but should be
>   only allowed for those who actually need it so that only the trusted
>   parties can certify QE's.
> 
>   Obviously the attestation service should know the public key of the used
>   PCE and that way detect illegit attestation, but whitelisting the legit
>   users still adds an additional layer of defence.
> 
>   Add new device file called /dev/sgx/provision. The sole purpose of this
>   file is to provide file descriptors that act as privilege tokens to allow
>   to build enclaves with ATTRIBUTE.PROVISIONKEY set. A new ioctl called
>   SGX_IOC_ENCLAVE_SET_ATTRIBUTE is used to assign this token to an enclave.

I also refined Documentation/x86/sgx.rst based on this in my tree [*].

[*] https://github.com/jsakkine-intel/linux-sgx.git

/Jarkko