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1014c49881
Track supplementary GIDs per task group, wire setgroups/getgroups syscalls when CONFIG_SCHED_NGROUPS > 0, and honor them in DAC checks via nxsched_has_gid(). When NGROUPS is 0, libc provides getgroups/ setgroups stubs. initgroups() fails instead of silently truncating when membership exceeds CONFIG_SCHED_NGROUPS. Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
96 lines
3 KiB
C
96 lines
3 KiB
C
/****************************************************************************
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* libs/libc/grp/lib_initgroups.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 <grp.h>
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#include <limits.h>
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#include <unistd.h>
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#include <errno.h>
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#include <nuttx/debug.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: initgroups
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*
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* Description:
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* The group database is read to determine all groups of which user is a
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* member. The additional group 'group' is also included. The resulting
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* set is installed as the calling process's supplementary group IDs via
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* setgroups().
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*
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* Input Parameters:
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* user - Name of the user to query the group database for.
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* group - Additional gid to add to the list of group IDs.
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*
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* Returned Value:
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* Zero if successful, and -1 on failure with errno set.
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*
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****************************************************************************/
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int initgroups(FAR const char *user, gid_t group)
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{
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#if defined(CONFIG_SCHED_NGROUPS) && CONFIG_SCHED_NGROUPS > 0
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gid_t groups[NGROUPS_MAX];
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int ngroups = NGROUPS_MAX;
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int ret;
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if (user == NULL)
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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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ret = getgrouplist(user, group, groups, &ngroups);
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if (ret < 0)
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{
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/* Buffer too small or lookup failure — errno already set by
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* getgrouplist when applicable.
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*/
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if (ngroups > NGROUPS_MAX)
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{
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swarn("initgroups: user '%s' has %d groups, NGROUPS_MAX=%d\n",
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user, ngroups, NGROUPS_MAX);
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set_errno(EINVAL);
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}
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return ERROR;
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}
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return setgroups(ret, groups);
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#else
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/* Without supplementary group storage, succeed silently. */
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UNUSED(user);
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UNUSED(group);
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return 0;
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#endif
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}
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