[Bug 2003701] Re: PKCS7: Message signed outside of X.509 validity window

[Dimitri John Ledkov]

The best we can do, is to take notAfter time of the signing certificate
and add that as the signingTime, which will then be used by the Sign
command as given.

This will ensure the signature is within valid time-series.

I don't see an easy openssl API to sign things without any signature
timestamp.

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Title:
  PKCS7: Message signed outside of X.509 validity window

Status in openssl package in Ubuntu:
  New
Status in sbsigntool package in Ubuntu:
  New

Bug description:
  When signing UEFI applications, the signature includes signing
  timestamp.

  Kernels, upon kexec, check that message signature is within the
  validity of the X.509 signing certificate.

  When using original canonical kernel team test key, I no longer can
  kexec kernels, as the test key has expired.

  UEFI specifications in general ignore signing time.

  IMHO we should remove / not include signing timestamp in the UEFI
  signatures to avoid this.

  ---

  i guess openssl needs to provide ability to create signatures without
  signingtime attribute.

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