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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* include/krb5/kdcpolicy_plugin.h - KDC policy plugin interface */
/*
* Copyright (C) 2017 by Red Hat, Inc.
* 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.
*
* 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 HOLDER 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 kdcpolicy plugin module implementors.
*
* The kdcpolicy pluggable interface currently has only one supported major
* version, which is 1. Major version 1 has a current minor version number of
* 1.
*
* kdcpolicy plugin modules should define a function named
* kdcpolicy_<modulename>_initvt, matching the signature:
*
* krb5_error_code
* kdcpolicy_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 maj_ver:
* maj_ver == 1: Cast to krb5_kdcpolicy_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_POLICY_PLUGIN_H
#define KRB5_POLICY_PLUGIN_H
#include <krb5/krb5.h>
/* Abstract module datatype. */
typedef struct krb5_kdcpolicy_moddata_st *krb5_kdcpolicy_moddata;
/* A module can optionally include kdb.h to inspect principal entries when
* authorizing requests. */
struct _krb5_db_entry_new;
/*
* Optional: Initialize module data. Return 0 on success,
* KRB5_PLUGIN_NO_HANDLE if the module is inoperable (due to configuration, for
* example), and any other error code to abort KDC startup. Optionally set
* *data_out to a module data object to be passed to future calls.
*/
typedef krb5_error_code
(*krb5_kdcpolicy_init_fn)(krb5_context context,
krb5_kdcpolicy_moddata *data_out);
/* Optional: Clean up module data. */
typedef krb5_error_code
(*krb5_kdcpolicy_fini_fn)(krb5_context context,
krb5_kdcpolicy_moddata moddata);
/*
* Optional: return an error code and set status to an appropriate string
* literal to deny an AS request; otherwise return 0. lifetime_out, if set,
* restricts the ticket lifetime. renew_lifetime_out, if set, restricts the
* ticket renewable lifetime.
*/
typedef krb5_error_code
(*krb5_kdcpolicy_check_as_fn)(krb5_context context,
krb5_kdcpolicy_moddata moddata,
const krb5_kdc_req *request,
const struct _krb5_db_entry_new *client,
const struct _krb5_db_entry_new *server,
const char *const *auth_indicators,
const char **status, krb5_deltat *lifetime_out,
krb5_deltat *renew_lifetime_out);
/*
* Optional: return an error code and set status to an appropriate string
* literal to deny a TGS request; otherwise return 0. lifetime_out, if set,
* restricts the ticket lifetime. renew_lifetime_out, if set, restricts the
* ticket renewable lifetime.
*/
typedef krb5_error_code
(*krb5_kdcpolicy_check_tgs_fn)(krb5_context context,
krb5_kdcpolicy_moddata moddata,
const krb5_kdc_req *request,
const struct _krb5_db_entry_new *server,
const krb5_ticket *ticket,
const char *const *auth_indicators,
const char **status, krb5_deltat *lifetime_out,
krb5_deltat *renew_lifetime_out);
typedef struct krb5_kdcpolicy_vtable_st {
const char *name;
krb5_kdcpolicy_init_fn init;
krb5_kdcpolicy_fini_fn fini;
krb5_kdcpolicy_check_as_fn check_as;
krb5_kdcpolicy_check_tgs_fn check_tgs;
} *krb5_kdcpolicy_vtable;
#endif /* KRB5_POLICY_PLUGIN_H */