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/***********************************************************************
*
* drop_privs.c
*
* Defines the "drop_privs" function which switches to specified user name.
*
* Copyright (C) 2002-2003 by Roaring Penguin Software Inc.
* http://www.roaringpenguin.com
*
* This program may be distributed under the terms of the GNU General
* Public License, Version 2, or (at your option) any later version.
*
***********************************************************************/
static char const RCSID[] =
"$Id$";
#include "config.h"
#include <sys/types.h>
#include <unistd.h>
#include <syslog.h>
#include <grp.h>
/**********************************************************************
* %FUNCTION: drop_privs
* %ARGUMENTS:
* user -- name of user to become
* uid, gid -- uid and gid to use
* %RETURNS:
* 0 on success; -1 on failure.
* %DESCRIPTION:
* Switches uid to uid of "user"; also enters that user's group and calls
* initgroups.
***********************************************************************/
int
drop_privs(char const *user, uid_t uid, gid_t gid)
{
/* Call initgroups */
#ifdef HAVE_INITGROUPS
if (initgroups((char *) user, gid) < 0) {
syslog(LOG_ERR, "drop_privs: initgroups for '%s' failed: %m", user);
return -1;
}
#endif
/* Call setgid */
if (setgid(gid) < 0) {
syslog(LOG_ERR, "drop_privs: setgid for '%s' failed: %m", user);
return -1;
}
/* Finally, call setuid */
if (setuid(uid) < 0) {
syslog(LOG_ERR, "drop_privs: setuid for '%s' failed: %m", user);
return -1;
}
return 0;
}
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