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In #55429 we added an empty certificate revocation list to the TLS keypairs in the certificate_authority backend resource. The intent was that the CRL would be signed by the keypair it is assocaited with, but the code mistakenly used a function that would find _any_ suitable keypair, which could create CRLS signed by the wrong key. This commit corrects both the initial CRL generation as well as any existing CRLs that have invalid signatures.
In clusters with multiple active signers (like those using HSMs or KMS for private keys), the only safe way to get a CRL is to use the one that's already present in the certificate_authority resource. Generating a CRL with GenerateCertAuthorityCRL will give you a valid CRL, but you have no control over which certificate signs it, which is likely to cause revocation failures later on.
In most cases, we're looking up an existing CRL, not generating one.
greedy52
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rosstimothy
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Backport #57822 to branch/v17
changelog: fixed an issue that could cause revocation checks to fail in Windows environments.