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14661fdba0
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>
105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/****************************************************************************
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* sched/group/group_setgid.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 <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: setgid
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*
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* Description:
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* The setgid() function sets the real group ID, effective group ID, and
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* the saved set-group-ID of the calling process to gid, given appropriate
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* privileges.
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*
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* Input Parameters:
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* gid - Identity to set the various process's group 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 group ID or the saved set-group-ID.
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*
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****************************************************************************/
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int setgid(gid_t gid)
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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 GID is in the valid range of 0 through INT16_MAX.
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* OpenGroup.org does not specify a GID_MAX or GID_MIN. Instead we use a
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* priori knowledge that gid_t is type int16_t.
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*/
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if ((uint16_t)gid > 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_egid == 0)
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{
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/* Root: set real, effective, and saved set-group-ID. */
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rgroup->tg_gid = gid;
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rgroup->tg_egid = gid;
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rgroup->tg_sgid = gid;
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}
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else if (gid == rgroup->tg_gid || gid == rgroup->tg_sgid)
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{
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/* Non-root: may only set effective GID to real or saved value. */
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rgroup->tg_egid = gid;
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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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