Stripping Username (EAP-TLS)

[s3b0 at gmx.de]

Hi everyone,

i am using Freeradius 1.1.7 on Suse Linux Enterprise 10.

I try to authenticate user with EAP-TLS. 
Everything worked fine, until i activated the check of cert_cn.

eap.conf:

-------------------
#  This check is done only if the previous
#  "check_cert_issuer" is not set, or if
#  the check succeeds.
#
check_cert_cn = %{User-Name}

-------------------


The problem is, that the username looks like "host/cl00006" but the cn is "cl00006".

How can i strip the username?

Thanks for your help.

Kind regards
Sebastian
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