What you are attempting to do is possible. In fact, Oracle has its own LDAP solution called Oracle Internet Directory (OiD). This product debuted with Oracle 8i. OiD is the replacement for Oracle Names Server. This is a centralized TNSNAMES.ORA configuration file for all client connections. Aside from resolving service names, OiD is a full LDAP directory service. And it can be used to authenticate users to a database. But to use authentication, you'll also need to couple OiD with Oracle Connection Manager. It doesn't make a difference what platform the user is connecting from either. So please investigate both OiD and Connection Manager.
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This was first published in March 2002