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/*
 * Copyright (c) 2006 Red Hat, Inc.
 * Portions copyright (c) 2006, 2011 Massachusetts Institute of Technology
 * All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name of Red Hat, Inc., nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Declarations for clpreauth plugin module implementors.
 *
 * The clpreauth interface has a single supported major version, which is
 * 1.  Major version 1 has a current minor version of 2.  clpreauth modules
 * should define a function named clpreauth_<modulename>_initvt, matching
 * the signature:
 *
 *   krb5_error_code
 *   clpreauth_modname_initvt(krb5_context context, int maj_ver,
 *                            int min_ver, krb5_plugin_vtable vtable);
 * The initvt function should:
 *
 * - Check that the supplied maj_ver number is supported by the module, or
 *   return KRB5_PLUGIN_VER_NOTSUPP if it is not.
 *
 * - Cast the vtable pointer as appropriate for the interface and maj_ver:
 *     maj_ver == 1: Cast to krb5_clpreauth_vtable
 *
 * - Initialize the methods of the vtable, stopping as appropriate for the
 *   supplied min_ver.  Optional methods may be left uninitialized.
 *
 * Memory for the vtable is allocated by the caller, not by the module.
 */

#ifndef KRB5_CLPREAUTH_PLUGIN_H
#define KRB5_CLPREAUTH_PLUGIN_H

#include <krb5/krb5.h>
#include <krb5/plugin.h>

/* clpreauth mechanism property flags */

/* Provides a real answer which we can send back to the KDC.  The client
 * assumes that one real answer will be enough. */
#define PA_REAL         0x00000001

/* Doesn't provide a real answer, but must be given a chance to run before any
 * REAL mechanism callbacks. */
#define PA_INFO         0x00000002

/* Abstract type for a client request information handle. */
typedef struct krb5_clpreauth_rock_st *krb5_clpreauth_rock;

/* Abstract types for module data and per-request module data. */
typedef struct krb5_clpreauth_moddata_st *krb5_clpreauth_moddata;
typedef struct krb5_clpreauth_modreq_st *krb5_clpreauth_modreq;

/* Before using a callback after version 1, modules must check the vers
 * field of the callback structure. */
typedef struct krb5_clpreauth_callbacks_st {
    int vers;

    /*
     * If an AS-REP has been received, return the enctype of the AS-REP
     * encrypted part.  Otherwise return the enctype chosen from etype-info, or
     * the first requested enctype if no etype-info was received.
     */
    krb5_enctype (*get_etype)(krb5_context context, krb5_clpreauth_rock rock);

    /* Get a pointer to the FAST armor key, or NULL if the clie