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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright (C) 2010 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#ifndef H_KRB5_KADM5_HOOK_PLUGIN
#define H_KRB5_KADM5_HOOK_PLUGIN
/**
* @file krb5/krb5_kadm5_hook_plugin.h
* Provide a plugin interface for kadm5 operations. This interface
* permits a plugin to intercept principal modification, creation and
* change password operations. Operations run at two stages: a
* precommit stage that runs before the operation is committed to the
* database and a postcommit operation that runs after the database
* is updated; see #kadm5_hook_stage for details on semantics.
*
* This interface is based on a proposed extension to Heimdal by Russ
* Allbery; it is likely that Heimdal will adopt an approach based on
* stacked kdb modules rather than this interface. For MIT, writing a
* plugin to this interface is significantly easier than stacking kdb
* modules. Also, the kadm5 interface is significantly more stable
* than the kdb interface, so this approach is more desirable than
* stacked kdb modules.
*
* This interface depends on kadm5/admin.h. As such, the interface
* does not provide strong guarantees of ABI stability.
*
* The kadm5_hook interface currently has only one supported major version,
* which is 1. Major version 1 has a current minor version number of 2.
*
* kadm5_hook plugins should:
* kadm5_hook_<modulename>_initvt, matching the signature:
*
* krb5_error_code
* kadm5_hook_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 kadm5_hook_vftable_1
*
* - 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.
*/
#include <krb5/krb5.h>
#include <krb5/plugin.h>
#include <kadm5/admin.h>
/**
* Whether the operation is being run before or after the database
* update.
*/
enum kadm5_hook_stage {
/** In this stage, any plugin failure prevents following plugins from
* running and aborts the operation.*/
KADM5_HOOK_STAGE_PRECOMMIT,
/** In this stage, plugin failures are logged but otherwise ignored.*/
KADM5_HOOK_STAGE_POSTCOMMIT
};
/** Opaque module data pointer. */
typedef struct kadm5_hook_modinfo_st kadm5_hook_modinfo;
/**
* Interface for the v1 virtual table for the kadm5_hook plugin.
* All entry points are optional. The name field must be provided.
*/
typedef struct kadm5_hook_vtable_1_st {
/** A text string identifying the plugin for logging messages. */
const char *name;
/** Initialize a plugin module.
* @param modinfo returns newly allocated module info for future
* calls. Cleaned up by the fini() function.
*/
kadm5_ret_t (*init)(krb5_context, kadm5_hook_modinfo **modinfo);
/** Clean up a module and free @a modinfo. */
void (*fini)(krb5_context, kadm5_hook_modinfo *modinfo);
/** Indicates that the password is being changed.
* @param stage is an integer from #kadm5_hook_stage enumeration
* @param keepold is true if existing keys are being kept.
* @param newpass is NULL if the key sare being randomized.
*/
kadm5_ret_t (*chpass)(krb5_context,
kadm5_hook_modinfo *modinfo,
int stage,
krb5_principal, krb5_boolean keepold,
int n_ks_tuple,
krb5_key_salt_tuple *ks_tuple,
const char *newpass);
/** Indicate a principal is created. */
kadm5_ret_t (*create)(krb5_context,
kadm5_hook_modinfo *,
int stage,
kadm5_principal_ent_t, long mask,
int n_ks_tuple,
krb5_key_salt_tuple *ks_tuple,
const char *password);
/** Modify a principal. */
kadm5_ret_t (*modify)(krb5_context,
kadm5_hook_modinfo *,
int stage,
kadm5_principal_ent_t, long mask);
/** Indicate a principal is deleted. */
kadm5_ret_t (*remove)(krb5_context,
kadm5_hook_modinfo *modinfo,
int stage, krb5_principal);
/* End of minor version 1. */
/** Indicate a principal is renamed. */
kadm5_ret_t (*rename)(krb5_context,
kadm5_hook_modinfo *modinfo,
int stage, krb5_principal, krb5_principal);
/* End of minor version 2. */
} kadm5_hook_vftable_1;
#endif /*H_KRB5_KADM5_HOOK_PLUGIN*/