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Re: [TLS] which alert for TLS client cert w/o keyUsage digitalSignature

Michael D'Errico <mike-list@pobox.com> Thu, 19 September 2013 15:39 UTC

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Date: Thu, 19 Sep 2013 08:39:31 -0700
From: Michael D'Errico <mike-list@pobox.com>
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Subject: Re: [TLS] which alert for TLS client cert w/o keyUsage digitalSignature
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Martin Rex wrote:
> I'm wondering which ssl/tls alert would be the most appropriate
> for a TLS server to send if the server requested a client cert
> and the client presents a certificate with a keyUsage that
> does not have digitalSignature asserted.
> 
> OpenSSL seems to send "illegal parameter" alert when processing
> CertificateVerify.  I might have chosen "bad certificate" alert.

BadCertificate seems better since it points the client toward the
encountered problem....

Mike

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