On Wed, Jun 24, 2020 at 05:39:39PM +0300, Paraschiv, Andra-Irina wrote: > > > On 23/06/2020 11:59, Stefan Hajnoczi wrote: > > On Mon, Jun 22, 2020 at 11:03:28PM +0300, Andra Paraschiv wrote: > > > +The kernel bzImage, the kernel command line, the ramdisk(s) are part of the > > > +Enclave Image Format (EIF); plus an EIF header including metadata such as magic > > > +number, eif version, image size and CRC. > > > + > > > +Hash values are computed for the entire enclave image (EIF), the kernel and > > > +ramdisk(s). That's used, for example, to check that the enclave image that is > > > +loaded in the enclave VM is the one that was intended to be run. > > > + > > > +These crypto measurements are included in a signed attestation document > > > +generated by the Nitro Hypervisor and further used to prove the identity of the > > > +enclave; KMS is an example of service that NE is integrated with and that checks > > > +the attestation doc. > > > + > > > +The enclave image (EIF) is loaded in the enclave memory at offset 8 MiB. The > > > +init process in the enclave connects to the vsock CID of the primary VM and a > > > +predefined port - 9000 - to send a heartbeat value - 0xb7. This mechanism is > > > +used to check in the primary VM that the enclave has booted. > > > + > > > +If the enclave VM crashes or gracefully exits, an interrupt event is received by > > > +the NE driver. This event is sent further to the user space enclave process > > > +running in the primary VM via a poll notification mechanism. Then the user space > > > +enclave process can exit. > > > + > > > +[1] https://aws.amazon.com/ec2/nitro/nitro-enclaves/ > > > +[2] https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt > > > +[3] https://lwn.net/Articles/807108/ > > > +[4] https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html > > > +[5] https://man7.org/linux/man-pages/man7/vsock.7.html > > Is the EIF specification and the attestation protocol available? > > For now, they are not publicly available. Once the refs are available (e.g. > AWS documentation, GitHub documentation), I'll include them in the kernel > documentation as well. > > As a note here, the NE project is currently in preview > (https://aws.amazon.com/ec2/nitro/nitro-enclaves/) and part of the > documentation / codebase will be publicly available when NE is generally > available (GA). This will be in addition to the ones already publicly > available, like the NE kernel driver. > > Let me know if I can help with any particular questions / clarifications. Thanks! Stefan
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