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170 lines
3.9 KiB
C
170 lines
3.9 KiB
C
/*-
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* Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <assert.h>
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#include <errno.h>
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#include <sys/acl.h>
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#include "acl_support.h"
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/*
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* An ugly detail of the implementation - fortunately not visible
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* to the API users - is the "branding": libc needs to keep track
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* of what "brand" ACL is: NFSv4, POSIX.1e or unknown. It happens
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* automatically - for example, during acl_get_file(3) ACL gets
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* branded according to the "type" argument; during acl_set_permset
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* ACL, if its brand is unknown it gets branded as NFSv4 if any of the
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* NFSv4 permissions that are not valid for POSIX.1e ACL are set etc.
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* Branding information is used for printing out the ACL (acl_to_text(3)),
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* veryfying acl_set_whatever arguments (checking against setting
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* bits that are valid only for NFSv4 in ACL branded as POSIX.1e) etc.
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*/
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static acl_t
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entry2acl(acl_entry_t entry)
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{
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acl_t aclp;
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aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS);
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return (aclp);
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}
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/*
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* Return brand of an ACL.
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*/
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int
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_acl_brand(const acl_t acl)
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{
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return (acl->ats_brand);
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}
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int
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_entry_brand(const acl_entry_t entry)
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{
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return (_acl_brand(entry2acl(entry)));
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}
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/*
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* Return 1, iff branding ACL as "brand" is ok.
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*/
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int
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_acl_brand_may_be(const acl_t acl, int brand)
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{
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if (_acl_brand(acl) == ACL_BRAND_UNKNOWN)
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return (1);
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if (_acl_brand(acl) == brand)
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return (1);
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return (0);
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}
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int
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_entry_brand_may_be(const acl_entry_t entry, int brand)
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{
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return (_acl_brand_may_be(entry2acl(entry), brand));
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}
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/*
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* Brand ACL as "brand".
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*/
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void
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_acl_brand_as(acl_t acl, int brand)
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{
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assert(_acl_brand_may_be(acl, brand));
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acl->ats_brand = brand;
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}
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void
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_entry_brand_as(const acl_entry_t entry, int brand)
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{
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_acl_brand_as(entry2acl(entry), brand);
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}
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int
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_acl_type_not_valid_for_acl(const acl_t acl, acl_type_t type)
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{
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switch (_acl_brand(acl)) {
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case ACL_BRAND_NFS4:
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if (type == ACL_TYPE_NFS4)
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return (0);
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break;
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case ACL_BRAND_POSIX:
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if (type == ACL_TYPE_ACCESS || type == ACL_TYPE_DEFAULT)
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return (0);
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break;
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case ACL_BRAND_UNKNOWN:
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return (0);
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}
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return (-1);
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}
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void
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_acl_brand_from_type(acl_t acl, acl_type_t type)
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{
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switch (type) {
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case ACL_TYPE_NFS4:
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_acl_brand_as(acl, ACL_BRAND_NFS4);
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break;
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case ACL_TYPE_ACCESS:
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case ACL_TYPE_DEFAULT:
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_acl_brand_as(acl, ACL_BRAND_POSIX);
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break;
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default:
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/* XXX: What to do here? */
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break;
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}
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}
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int
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acl_get_brand_np(acl_t acl, int *brand_p)
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{
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if (acl == NULL || brand_p == NULL) {
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errno = EINVAL;
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return (-1);
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}
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*brand_p = _acl_brand(acl);
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return (0);
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}
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