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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* include/krb5/certauth_plugin.h - certauth plugin header. */
/*
* 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.
*/
/*
* Certificate authorization plugin interface. The PKINIT server module uses
* this interface to check client certificate attributes after the certificate
* signature has been verified.
*/
#ifndef KRB5_CERTAUTH_PLUGIN_H
#define KRB5_CERTAUTH_PLUGIN_H
#include <krb5/krb5.h>
#include <krb5/plugin.h>
/* Abstract module data type. */
typedef struct krb5_certauth_moddata_st *krb5_certauth_moddata;
typedef struct _krb5_db_entry_new krb5_db_entry;
/*
* Optional: Initialize module data.
*/
typedef krb5_error_code
(*krb5_certauth_init_fn)(krb5_context context,
krb5_certauth_moddata *moddata_out);
/*
* Optional: Clean up the module data.
*/
typedef void
(*krb5_certauth_fini_fn)(krb5_context context, krb5_certauth_moddata moddata);
/*
* Mandatory:
* Return 0 if the DER-encoded cert is authorized for PKINIT authentication by
* princ; otherwise return one of the following error codes:
* - KRB5KDC_ERR_CLIENT_NAME_MISMATCH - incorrect SAN value
* - KRB5KDC_ERR_INCONSISTENT_KEY_PURPOSE - incorrect EKU
* - KRB5KDC_ERR_CERTIFICATE_MISMATCH - other extension error
* - KRB5_PLUGIN_NO_HANDLE - the module has no opinion about cert
*
* - opts is used by built-in modules to receive internal data, and must be
* ignored by other modules.
* - db_entry receives the client principal database entry, and can be ignored
* by modules that do not link with libkdb5.
* - *authinds_out optionally returns a null-terminated list of authentication
* indicator strings upon KRB5_PLUGIN_NO_HANDLE or accepted authorization.
*/
typedef krb5_error_code
(*krb5_certauth_authorize_fn)(krb5_context context,
krb5_certauth_moddata moddata,
const uint8_t *cert, size_t cert_len,
krb5_const_principal princ, const void *opts,
const krb5_db_entry *db_entry,
char ***authinds_out);
/*
* Free indicators allocated by a module. Mandatory if authorize returns
* authentication indicators.
*/
typedef void
(*krb5_certauth_free_indicator_fn)(krb5_context context,
krb5_certauth_moddata moddata,
char **authinds);
typedef struct krb5_certauth_vtable_st {
char *name;
krb5_certauth_init_fn init;
krb5_certauth_fini_fn fini;
krb5_certauth_authorize_fn authorize;
krb5_certauth_free_indicator_fn free_ind;
} *krb5_certauth_vtable;
#endif /* KRB5_CERTAUTH_PLUGIN_H */