114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Robert N M Watson, Gleb Popov
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* acl_from_mode_np: Create an ACL from a mode_t.
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/acl.h>
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#include <sys/stat.h>
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/*
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* return an ACL corresponding to the permissions
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* contained in mode_t
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*/
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acl_t
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acl_from_mode_np(const mode_t mode)
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{
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acl_t acl;
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acl_entry_t entry;
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acl_permset_t perms;
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/* create the ACL */
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acl = acl_init(3);
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/* here and below, the only possible reason to fail is ENOMEM, so
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* no need to set errno again
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*/
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if (acl == NULL)
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return (NULL);
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/* First entry: ACL_USER_OBJ */
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if (acl_create_entry(&acl, &entry) == -1)
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return (NULL);
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/* TODO: need to handle error there and below? */
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acl_set_tag_type(entry, ACL_USER_OBJ);
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acl_get_permset(entry, &perms);
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acl_clear_perms(perms);
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/* calculate user mode */
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if (mode & S_IRUSR)
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acl_add_perm(perms, ACL_READ);
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if (mode & S_IWUSR)
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acl_add_perm(perms, ACL_WRITE);
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if (mode & S_IXUSR)
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acl_add_perm(perms, ACL_EXECUTE);
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acl_set_permset(entry, perms);
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/* Second entry: ACL_GROUP_OBJ */
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if (acl_create_entry(&acl, &entry) == -1)
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return (NULL);
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acl_set_tag_type(entry, ACL_GROUP_OBJ);
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acl_get_permset(entry, &perms);
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acl_clear_perms(perms);
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/* calculate group mode */
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if (mode & S_IRGRP)
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acl_add_perm(perms, ACL_READ);
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if (mode & S_IWGRP)
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acl_add_perm(perms, ACL_WRITE);
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if (mode & S_IXGRP)
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acl_add_perm(perms, ACL_EXECUTE);
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acl_set_permset(entry, perms);
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/* Third entry: ACL_OTHER */
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if (acl_create_entry(&acl, &entry) == -1)
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return (NULL);
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acl_set_tag_type(entry, ACL_OTHER);
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acl_get_permset(entry, &perms);
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acl_clear_perms(perms);
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/* calculate other mode */
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if (mode & S_IROTH)
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acl_add_perm(perms, ACL_READ);
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if (mode & S_IWOTH)
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acl_add_perm(perms, ACL_WRITE);
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if (mode & S_IXOTH)
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acl_add_perm(perms, ACL_EXECUTE);
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acl_set_permset(entry, perms);
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return (acl);
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}
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