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+.. _certauth_plugin:
+
+PKINIT certificate authorization interface (certauth)
+=====================================================
+
+The certauth interface was first introduced in release 1.16.  It
+allows customization of the X.509 certificate attribute requirements
+placed on certificates used by PKINIT enabled clients.  For a detailed
+description of the certauth interface, see the header file
+``<krb5/certauth_plugin.h>``
+
+A certauth module implements the **authorize** method to determine
+whether a client's certificate is authorized to authenticate a client
+principal.  **authorize** receives the DER-encoded certificate, the
+requested client principal, and a pointer to the client's
+krb5_db_entry (for modules that link against libkdb5).  It returns the
+authorization status and optionally outputs a list of authentication
+indicator strings to be added to the ticket.  A module must use its
+own internal or library-provided ASN.1 certificate decoder.
+
+A module can optionally create and destroy module data with the
+**init** and **fini** methods.  Module data objects last for the
+lifetime of the KDC process.
+
+If a module allocates and returns a list of authentication indicators
+from **authorize**, it must also implement the **free_ind** method
+to free the list.