76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/****************************************************************************
|
|
* libs/libc/unistd/lib_setreuid.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: setreuid
|
|
*
|
|
* Description:
|
|
* The setreuid() function sets the real user ID and/or the effective user
|
|
* ID of the calling task group to ruid and/or euid.
|
|
*
|
|
* Input Parameters:
|
|
* ruid - Real user identity to set. The special value (uid_t)-1
|
|
* indicates that the real user ID should not be changed.
|
|
* ruid - Effective user identity to set. The special value (uid_t)-1
|
|
* indicates that the effective user ID should not be changed.
|
|
*
|
|
* Returned Value:
|
|
* Zero if successful and -1 in case of failure, in which case errno is set
|
|
* appropriately.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int setreuid(uid_t ruid, uid_t euid)
|
|
{
|
|
int ret = OK;
|
|
|
|
if (ruid != (uid_t)-1)
|
|
{
|
|
/* Set the real user ID. CAREFUL: This exploits non-standard behavior
|
|
* of setuid(): setuid() should set the real, effective, and saved
|
|
* user ID. Here we depend on it setting only the real user ID.
|
|
*/
|
|
|
|
ret = setuid(ruid);
|
|
}
|
|
|
|
if (ret >= 0 && euid != (uid_t)-1)
|
|
{
|
|
/* Set the effective user ID */
|
|
|
|
ret = seteuid(euid);
|
|
}
|
|
|
|
return ret;
|
|
}
|