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Abhishek MishraandAlan C. Assis
cf3781b7f0
Complete the POSIX credential setters for real/effective/saved UID and GID so login and privilege-drop paths can clear saved-root without relying on setreuid patterns alone. Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/****************************************************************************
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* sched/group/group_setresgid.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: setresgid
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*
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* Description:
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* setresgid() sets the real, effective, and saved set-group-IDs of the
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* calling process. The value (gid_t)-1
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* for any argument leaves that ID unchanged.
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*
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****************************************************************************/
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int setresgid(gid_t rgid, gid_t egid, gid_t sgid)
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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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gid_t old_rgid;
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gid_t old_egid;
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gid_t old_sgid;
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gid_t new_rgid;
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gid_t new_egid;
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gid_t new_sgid;
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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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old_rgid = rgroup->tg_gid;
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old_egid = rgroup->tg_egid;
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old_sgid = rgroup->tg_sgid;
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new_rgid = (rgid == (gid_t)-1) ? old_rgid : rgid;
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new_egid = (egid == (gid_t)-1) ? old_egid : egid;
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new_sgid = (sgid == (gid_t)-1) ? old_sgid : sgid;
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/* Non-root euid may only select among current real/effective/saved. */
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if (rgroup->tg_euid != 0)
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{
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if ((new_rgid != old_rgid && new_rgid != old_egid &&
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new_rgid != old_sgid) ||
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(new_egid != old_rgid && new_egid != old_egid &&
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new_egid != old_sgid) ||
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(new_sgid != old_rgid && new_sgid != old_egid &&
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new_sgid != old_sgid))
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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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}
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rgroup->tg_gid = new_rgid;
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rgroup->tg_egid = new_egid;
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rgroup->tg_sgid = new_sgid;
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return OK;
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}
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