99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
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/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <hurd.h>
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#include <hurd/id.h>
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#include <string.h>
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/* Set the group ID of the calling process to UID.
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If the calling process is the super-user, the real
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and effective group IDs, and the saved set-group-ID to UID;
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if not, the effective group ID is set to GID. */
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int
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__setgid (gid_t gid)
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{
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auth_t newauth;
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error_t err;
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retry:
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HURD_CRITICAL_BEGIN;
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__mutex_lock (&_hurd_id.lock);
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err = _hurd_check_ids ();
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if (!err)
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{
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/* Make a new auth handle which has GID as the real gid,
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and as the first element in the list of effective gids. */
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gid_t *newgen, *newaux, auxbuf[2];
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size_t ngen, naux;
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if (_hurd_id.gen.ngids == 0)
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{
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/* No effective gids now. The new set will be just GID. */
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newgen = &gid;
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ngen = 1;
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}
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else
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{
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_hurd_id.gen.gids[0] = gid;
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_hurd_id.valid = 0;
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newgen = _hurd_id.gen.gids;
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ngen = _hurd_id.gen.ngids;
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}
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newaux = _hurd_id.aux.gids;
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naux = _hurd_id.aux.ngids;
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if (_hurd_id.gen.nuids > 0 && _hurd_id.gen.uids[0] == 0)
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{
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/* We are root; set the real and saved IDs too. */
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_hurd_id.valid = 0;
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if (_hurd_id.aux.ngids < 2)
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{
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newaux = auxbuf;
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naux = 2;
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}
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newaux[0] = newaux[1] = gid;
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}
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err = __USEPORT (AUTH, __auth_makeauth
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(port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
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_hurd_id.gen.uids, _hurd_id.gen.nuids,
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_hurd_id.aux.uids, _hurd_id.aux.nuids,
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newgen, ngen, newaux, naux,
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&newauth));
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}
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__mutex_unlock (&_hurd_id.lock);
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HURD_CRITICAL_END;
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if (err == EINTR)
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/* Got a signal while inside an RPC of the critical section, retry again */
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goto retry;
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if (err)
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return __hurd_fail (err);
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/* Install the new handle and reauthenticate everything. */
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err = __setauth (newauth);
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__mach_port_deallocate (__mach_task_self (), newauth);
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return err;
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}
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weak_alias (__setgid, setgid)
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