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Asked: 2026-05-10T18:48:13+00:00

I have a site that is using x509 client certificates (2 way SSL) to

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I have a site that is using x509 client certificates (2 way SSL) to authenticate users and an LDAP directory that contains authorization information. I would like to use one of the certificate attributes to query the directory ( SSL_CLIENT_S_DN_CN to be exact ). I see how to use mod_ssl to use the user’s client certificates for authentication and I see how to use mod_auth_ldap and the like to use the username from basic or form based authentication to query the LDAP store for authorization. What I haven’t seen a good example for is how to use an attribute of the user’s client certificate in place of the username to query the LDAP. Any ideas?

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  1. A module exists for apache 2.2.x: modXLDAPAuth

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