Re: SecureBoot certificates

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On Tuesday, May 30, 2023 10:00:53 PM EDT Chris Murphy wrote:
> On Fri, May 26, 2023, at 10:20 AM, Steve Grubb wrote:
> > sbattach --detach signature  /boot/efi/EFI/BOOT/BOOTX64.EFI
> > openssl pkcs7 -inform DER -in signature -text -print_certs >
> > shim-certs.txt> 
> >         Issuer: C=US, ST=Washington, L=Redmond, O=Microsoft Corporation,
> > 
> > CN=Microsoft Corporation UEFI CA 2011
> > 
> >         Validity
> >         
> >             Not Before: Sep  9 19:40:20 2021 GMT
> >             Not After : Sep  1 19:40:20 2022 GMT
> 
> What version of shim do you have installed? What edition/spin are you
> using?

This is plain old F38. The shim is shim-x64-15.6-2.x86_64

> I have shim-x64-15.6-2.x86_64 and it's reporting
> 
>             Not Before: Jun 27 21:22:45 2011 GMT
>             Not After : Jun 27 21:32:45 2026 GMT
> 
> A possible explanation is rpm-ostree derivatives may show a current version
> grub and shim, but those are not copied to the EFI System partition.
> That's the job of bootupd but I'm not sure if that's fully implemented yet
> in Fedora.

Appearantly not. But rpm -qf  /boot/efi/EFI/BOOT/BOOTX64.EFI shows it is owned 
by the shim. locate BOOTX64.EFI only shows one location, the previously 
mentioned path.

I understand that certificate validation cannot take time and date into 
account during boot because you have no idea if the system clock is accurate 
until the whole OS can run a NTP sync. But I am just surprised my system has 
binaries with expired signatures.

-Steve

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