How are client certificate expired CRLs handled?

Maxim Dounin mdounin at
Thu Nov 26 13:28:35 UTC 2015


On Wed, Nov 25, 2015 at 11:58:19PM -0500, DankMemes wrote:

> If any of the concatenated CRLs in the file provided to ssl_crl have expired
> (root or intermediate), what is the Nginx behavior (assuming
> ssl_verify_client is on)? Does it result in failing verification of the
> client certificate (chain), or does it just log a warning, or nothing
> happens? If it does fail verification, how can I detect that specific
> problems and still perform the rest of verification (valid certificate which
> itself has not expired and chain of trust can be established to the
> verification depth) (the CA I'm using to generate the CRLs is on the same
> server, so it's not a problem if it's actually expired -- though a warning
> message would be nice as a reminder to the admin).

CRLs are just loaded by nginx from a file specified by the ssl_crl 
directive, and no additional checks are made. 

Maxim Dounin

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