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128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/* setresgid -- set real group ID, effective group ID, and saved-set group ID
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Copyright (C) 2002-2024 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 <hurd.h>
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#include <hurd/id.h>
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/* Set the real group ID, effective group ID, and saved-set group ID,
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of the calling process to RGID, EGID, and SGID, respectively. */
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int
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__setresgid (gid_t rgid, gid_t egid, gid_t sgid)
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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 EGID as the first element in the
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list of effective gids. */
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uid_t *newgen, *newaux;
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uid_t auxs[2] = { rgid, sgid };
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size_t ngen, naux;
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newgen = _hurd_id.gen.gids;
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ngen = _hurd_id.gen.ngids;
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if (egid != -1)
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{
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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 UID. */
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newgen = &egid;
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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] = egid;
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_hurd_id.valid = 0;
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}
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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 (rgid != -1)
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{
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if (_hurd_id.aux.ngids == 0)
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{
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newaux = &rgid;
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naux = 1;
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}
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else
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{
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_hurd_id.aux.gids[0] = rgid;
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_hurd_id.valid = 0;
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}
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}
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if (sgid != -1)
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{
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if (rgid == -1)
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{
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if (_hurd_id.aux.ngids >= 1)
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auxs[0] = _hurd_id.aux.gids[0];
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else if (_hurd_id.gen.ngids >= 1)
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auxs[0] = _hurd_id.gen.gids[0];
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else
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/* Not even an effective GID.
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Fall back to the only GID we have. */
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auxs[0] = sgid;
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}
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if (_hurd_id.aux.ngids <= 1)
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{
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/* No saved gids now. The new set will be just UID. */
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newaux = auxs;
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naux = 2;
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}
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else
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{
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_hurd_id.aux.gids[1] = sgid;
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_hurd_id.valid = 0;
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}
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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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libc_hidden_def (__setresgid)
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weak_alias (__setresgid, setresgid)
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