/* Copyright (c) 2011-2014 Yubico AB
* 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
* 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.
*/

#ifndef __PAM_U2F_DROP_PRIVS_H_INCLUDED__
#define __PAM_U2F_DROP_PRIVS_H_INCLUDED__

#ifdef HAVE_PAM_MODUTIL_DROP_PRIV
#include <security/pam_modutil.h>
#elif HAVE_OPENPAM_BORROW_CRED
#include <sys/types.h>
#include <security/pam_appl.h>
#include <security/openpam.h>

#define PAM_MODUTIL_DEF_PRIVS(n) /* noop */
#define pam_modutil_drop_priv(pamh, privs, pwd)                                \
 ((openpam_borrow_cred((pamh), (pwd)) == PAM_SUCCESS) ? 0 : -1)
#define pam_modutil_regain_priv(pamh, privs)                                   \
 ((openpam_restore_cred((pamh)) == PAM_SUCCESS) ? 0 : -1)

#else

#include <pwd.h>
#include <stdio.h>

#ifdef HAVE_SECURITY_PAM_APPL_H
#include <security/pam_appl.h>
#endif
#ifdef HAVE_SECURITY_PAM_MODULES_H
#include <security/pam_modules.h>
#endif

#define SAVED_GROUPS_MAX_LEN 64 /* as pam_modutil.. */

struct _ykpam_privs {
 uid_t saved_euid;
 gid_t saved_egid;
 gid_t *saved_groups;
 int saved_groups_length;
 FILE *debug_file;
};

#define PAM_MODUTIL_DEF_PRIVS(n)                                               \
 gid_t n##_saved_groups[SAVED_GROUPS_MAX_LEN];                                \
 struct _ykpam_privs n = { \
     (uid_t)-1, \
     (gid_t)-1, \
     n##_saved_groups, \
     SAVED_GROUPS_MAX_LEN,     \
     cfg->debug_file, \
 }

int pam_modutil_drop_priv(pam_handle_t *, struct _ykpam_privs *,
                         struct passwd *);
int pam_modutil_regain_priv(pam_handle_t *, struct _ykpam_privs *);

#endif /* HAVE_PAM_MODUTIL_DROP_PRIV */
#endif /* __PAM_U2F_DROP_PRIVS_H_INCLUDED__ */