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370d89a012
Adds tg_suid and tg_sgid fields to task_group_s to complete the POSIX three-field identity model (real, effective, saved-set). Updates group_inherit_identity() to propagate the new fields from parent to child task group on task creation. Fixes setuid(), setgid(), seteuid(), and setegid() to implement correct POSIX privilege transition logic: - Root (euid==0): may set any value; all three IDs updated by setuid/setgid - Non-root: may only set effective ID to real or saved value; else EPERM Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/****************************************************************************
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* sched/group/group_setuid.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <sched/sched.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: setuid
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*
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* Description:
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* The setuid() function sets the real user ID, effective user ID, and the
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* saved set-user-ID of the calling process to uid, given appropriate
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* privileges.
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*
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* Input Parameters:
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* uid - User identity to set the various process's user ID attributes to.
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*
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* Returned Value:
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* Zero if successful and -1 in case of failure, in which case errno is set
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* to one of he following values:
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*
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* EINVAL - The value of the uid argument is invalid and not supported by
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* the implementation.
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* EPERM - The process does not have appropriate privileges and uid does
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* not match the real user ID or the saved set-user-ID.
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*
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****************************************************************************/
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int setuid(uid_t uid)
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{
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FAR struct tcb_s *rtcb;
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FAR struct task_group_s *rgroup;
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/* Verify that the UID is in the valid range of 0 through INT16_MAX.
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* OpenGroup.org does not specify a UID_MAX or UID_MIN. Instead we use a
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* priori knowledge that uid_t is type int16_t.
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*/
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if ((uint16_t)uid > INT16_MAX)
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{
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set_errno(EINVAL);
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return ERROR;
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}
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/* Get the currently executing thread's task group. */
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rtcb = this_task();
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rgroup = rtcb->group;
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DEBUGASSERT(rgroup != NULL);
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if (rgroup->tg_euid == 0)
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{
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/* Root: set real, effective, and saved set-user-ID. */
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rgroup->tg_uid = uid;
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rgroup->tg_euid = uid;
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rgroup->tg_suid = uid;
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}
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else if (uid == rgroup->tg_uid || uid == rgroup->tg_suid)
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{
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/* Non-root: may only set effective UID to real or saved value. */
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rgroup->tg_euid = uid;
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}
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else
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{
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set_errno(EPERM);
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return ERROR;
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}
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return OK;
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}
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