drop_privs.h

/* Copyright (c) 2011-2013 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,
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 */

#ifndef __PAM_YUBICO_DROP_PRIVS_H_INCLUDED__
#define __PAM_YUBICO_DROP_PRIVS_H_INCLUDED__

#ifdef HAVE_PAM_MODUTIL_DROP_PRIV
#include <security/pam_modutil.h>
#else

#include <pwd.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;
};

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

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
#endif