[openssl-users] TLS Error in FreeRadius - eap_tls: ERROR: Failed in __FUNCTION__ (SSL_read): error:1417C086:SSL routines:tls_process_client_certificate:certificate verify failed

[Jeffrey Walton]

On Sun, Jan 21, 2018 at 1:31 PM, Viktor Dukhovni
<openssl-users at dukhovni.org> wrote:
>
> ...
> OpenSSL interprets the "extendedKeyUsage" extension in CA certificates
> as a restriction on the allowed extended key usages of leaf certificates
> that can be issued by that CA.
>
> You should typically not specify extended key usage for CA certificates
> at all, unless you mean to restrict them to specific purposes.

The behavior is inconsistent with RFC 5280:

4.2.1.12.  Extended Key Usage

   This extension indicates one or more purposes for which the certified
   public key may be used, in addition to or in place of the basic
   purposes indicated in the key usage extension.  In general, this
   extension will appear only in end entity certificates.  This
   extension is defined as follows ...

Jeff