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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright (C) 2013 by the 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.
*
* 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 hostrealm plugin module implementors.
*
* The hostrealm pluggable interface currently has only one supported major
* version, which is 1. Major version 1 has a current minor version number of
* 1.
*
* Hostrealm plugin modules should define a function named
* hostrealm_<modulename>_initvt, matching the signature:
*
* krb5_error_code
* hostrealm_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_hostrealm_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_HOSTREALM_PLUGIN_H
#define KRB5_HOSTREALM_PLUGIN_H
#include <krb5/krb5.h>
#include <krb5/plugin.h>
/* An abstract type for hostrealm module data. */
typedef struct krb5_hostrealm_moddata_st *krb5_hostrealm_moddata;
/*** Method type declarations ***/
/* Optional: Initialize module data. */
typedef krb5_error_code
(*krb5_hostrealm_init_fn)(krb5_context context,
krb5_hostrealm_moddata *data);
/*
* Optional: Determine the possible realms of a hostname, using only secure,
* authoritative mechanisms (ones which should be used prior to trying
* referrals when getting a service ticket). Return success with a
* null-terminated list of realms in *realms_out, KRB5_PLUGIN_NO_HANDLE to
* defer to later modules, or another error to terminate processing.
*/
typedef krb5_error_code
(*krb5_hostrealm_host_realm_fn)(krb5_context context,
krb5_hostrealm_moddata data,
const char *host, char ***realms_out);
/*
* Optional: Determine the possible realms of a hostname, using heuristic or
* less secure mechanisms (ones which should be used after trying referrals
* when getting a service ticket). Return success with a null-terminated list
* of realms in *realms_out, KRB5_PLUGIN_NO_HANDLE to defer to later modules,
* or another error to terminate processing.
*/
typedef krb5_error_code
(*krb5_hostrealm_fallback_realm_fn)(krb5_context context,
krb5_hostrealm_moddata data,
const char *host, char ***realms_out);
/*
* Optional: Determine the possible default realms of the local host. Return
* success with a null-terminated list of realms in *realms_out,
* KRB5_PLUGIN_NO_HANDLE to defer to later modules, or another error to
* terminate processing.
*/
typedef krb5_error_code
(*krb5_hostrealm_default_realm_fn)(krb5_context context,
krb5_hostrealm_moddata data,
char ***realms_out);
/*
* Mandatory (if any of the query methods are implemented): Release the memory
* returned by one of the interface methods.
*/
typedef void
(*krb5_hostrealm_free_list_fn)(krb5_context context,
krb5_hostrealm_moddata data, char **list);
/* Optional: Release resources used by module data. */
typedef void
(*krb5_hostrealm_fini_fn)(krb5_context context, krb5_hostrealm_moddata data);
/* hostrealm vtable for major version 1. */
typedef struct krb5_hostrealm_vtable_st {
const char *name; /* Mandatory: name of module. */
krb5_hostrealm_init_fn init;
krb5_hostrealm_fini_fn fini;
krb5_hostrealm_host_realm_fn host_realm;
krb5_hostrealm_fallback_realm_fn fallback_realm;
krb5_hostrealm_default_realm_fn default_realm;
krb5_hostrealm_free_list_fn free_list;
/* Minor version 1 ends here. */
} *krb5_hostrealm_vtable;
#endif /* KRB5_HOSTREALM_PLUGIN_H */