91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
|
/****************************************************************************
|
||
|
|
* libs/libc/unistd/lib_setregid.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2019 Gregory Nutt. All rights reserved.
|
||
|
|
* Author: Michael Jung <mijung@gmx.net>
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
*
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. 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.
|
||
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
||
|
|
* used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Included Files
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
#include <nuttx/config.h>
|
||
|
|
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <errno.h>
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Public Functions
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Name: setregid
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* The setregid() function sets the real group ID and/or the effective group
|
||
|
|
* ID of the calling task group to rgid and/or egid.
|
||
|
|
*
|
||
|
|
* Input Parameters:
|
||
|
|
* rgid - Real group identity to set. The special value (gid_t)-1
|
||
|
|
* indicates that the real group ID should not be changed.
|
||
|
|
* rgid - Effective group identity to set. The special value (gid_t)-1
|
||
|
|
* indicates that the effective group ID should not be changed.
|
||
|
|
*
|
||
|
|
* Returned Value:
|
||
|
|
* Zero if successful and -1 in case of failure, in which case errno is set
|
||
|
|
* appropriately.
|
||
|
|
*
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
int setregid(gid_t rgid, gid_t egid)
|
||
|
|
{
|
||
|
|
int ret = OK;
|
||
|
|
|
||
|
|
if (rgid != (gid_t)-1)
|
||
|
|
{
|
||
|
|
/* Set the real group ID. CAREFUL: This exploits non-standard behavior
|
||
|
|
* of setgid(): setgid() should set the real, effective, and saved
|
||
|
|
* group ID. Here we depend on it setting only the real group ID.
|
||
|
|
*/
|
||
|
|
|
||
|
|
ret = setgid(rgid);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ret >= 0 && egid != (gid_t)-1)
|
||
|
|
{
|
||
|
|
/* Set the effective group ID */
|
||
|
|
|
||
|
|
ret = setegid(egid);
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|