Differential D28255 Diff 82637 lib/libc/posix1e/acl_from_mode_np.c

Changeset View

Standalone View

lib/libc/posix1e/acl_from_mode_np.c

This file was added.

				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2021 Robert N M Watson, Gleb Popov
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/
				/*
				* acl_from_mode_np: Create an ACL from a mode_t.
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/types.h>
				#include <sys/param.h>
				#include <sys/acl.h>
				#include <sys/stat.h>

				/*
				* return an ACL corresponding to the permissions
				* contained in mode_t
				*/
				acl_t
				acl_from_mode_np(const mode_t mode)
				{
				acl_t acl;
				acl_entry_t entry;
				acl_permset_t perms;

				/* create the ACL */
				acl = acl_init(3);
				/* here and below, the only possible reason to fail is ENOMEM, so
				* no need to set errno again
				*/
				if (!acl)
				return NULL;
				kibUnsubmitted Done Inline Actions should this be acl == NULL? kib: should this be acl == NULL?

				/* First entry: ACL_USER_OBJ */
				if (acl_create_entry(&acl, &entry) == -1)
				return NULL;
				/* TODO: need to handle error there and below? */
				acl_set_tag_type(entry, ACL_USER_OBJ);

				acl_get_permset(entry, &perms);
				acl_clear_perms(perms);

				/* calculate user mode */
				if (mode & S_IRUSR)
				acl_add_perm(perms, ACL_READ);
				if (mode & S_IWUSR)
				acl_add_perm(perms, ACL_WRITE);
				if (mode & S_IXUSR)
				acl_add_perm(perms, ACL_EXECUTE);

				acl_set_permset(entry, perms);

				/* Second entry: ACL_GROUP_OBJ */
				if (acl_create_entry(&acl, &entry) == -1)
				return NULL;
				acl_set_tag_type(entry, ACL_GROUP_OBJ);

				acl_get_permset(entry, &perms);
				acl_clear_perms(perms);

				/* calculate group mode */
				if (mode & S_IRGRP)
				acl_add_perm(perms, ACL_READ);
				if (mode & S_IWGRP)
				acl_add_perm(perms, ACL_WRITE);
				if (mode & S_IXGRP)
				acl_add_perm(perms, ACL_EXECUTE);

				acl_set_permset(entry, perms);

				/* Third entry: ACL_OTHER */
				if (acl_create_entry(&acl, &entry) == -1)
				return NULL;
				acl_set_tag_type(entry, ACL_OTHER);

				acl_get_permset(entry, &perms);
				acl_clear_perms(perms);

				/* calculate other mode */
				if (mode & S_IROTH)
				acl_add_perm(perms, ACL_READ);
				if (mode & S_IWOTH)
				acl_add_perm(perms, ACL_WRITE);
				if (mode & S_IXOTH)
				acl_add_perm(perms, ACL_EXECUTE);

				acl_set_permset(entry, perms);

				return(acl);
				}