eb401e64c1
that was supposed to be kernel-only. There should be no functional changes.
226 lines
5.3 KiB
C
226 lines
5.3 KiB
C
/*-
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* Copyright (c) 2001 Chris D. Faulhaber
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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 <errno.h>
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#include <stdio.h>
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#include <assert.h>
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#include <sys/acl.h>
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#include <sys/stat.h>
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#include "acl_support.h"
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/*
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* These routines from sys/kern/subr_acl_nfs4.c are used by both kernel
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* and libc.
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*/
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void acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp);
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void acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int file_owner_id,
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int canonical_six);
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static acl_t
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_nfs4_acl_strip_np(const acl_t aclp, int canonical_six)
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{
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acl_t newacl;
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mode_t mode = 0;
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newacl = acl_init(ACL_MAX_ENTRIES);
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if (newacl == NULL) {
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errno = ENOMEM;
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return (NULL);
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}
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_acl_brand_as(newacl, ACL_BRAND_NFS4);
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acl_nfs4_sync_mode_from_acl(&mode, &(aclp->ats_acl));
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acl_nfs4_trivial_from_mode_libc(&(newacl->ats_acl), mode, canonical_six);
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return (newacl);
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}
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static acl_t
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_posix1e_acl_strip_np(const acl_t aclp, int recalculate_mask)
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{
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acl_t acl_new, acl_old;
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acl_entry_t entry, entry_new;
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acl_permset_t perm;
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acl_tag_t tag;
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int entry_id, have_mask_entry;
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assert(_acl_brand(aclp) == ACL_BRAND_POSIX);
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acl_old = acl_dup(aclp);
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if (acl_old == NULL)
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return (NULL);
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assert(_acl_brand(acl_old) == ACL_BRAND_POSIX);
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have_mask_entry = 0;
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acl_new = acl_init(ACL_MAX_ENTRIES);
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if (acl_new == NULL)
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return (NULL);
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tag = ACL_UNDEFINED_TAG;
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/* only save the default user/group/other entries */
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entry_id = ACL_FIRST_ENTRY;
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while (acl_get_entry(acl_old, entry_id, &entry) == 1) {
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entry_id = ACL_NEXT_ENTRY;
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assert(_entry_brand(entry) == ACL_BRAND_POSIX);
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if (acl_get_tag_type(entry, &tag) == -1)
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return (NULL);
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switch(tag) {
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case ACL_USER_OBJ:
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case ACL_GROUP_OBJ:
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case ACL_OTHER:
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if (acl_get_tag_type(entry, &tag) == -1)
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return (NULL);
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if (acl_get_permset(entry, &perm) == -1)
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return (NULL);
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if (acl_create_entry(&acl_new, &entry_new) == -1)
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return (NULL);
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if (acl_set_tag_type(entry_new, tag) == -1)
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return (NULL);
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if (acl_set_permset(entry_new, perm) == -1)
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return (NULL);
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if (acl_copy_entry(entry_new, entry) == -1)
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return (NULL);
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assert(_entry_brand(entry_new) == ACL_BRAND_POSIX);
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break;
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case ACL_MASK:
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have_mask_entry = 1;
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break;
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default:
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break;
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}
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}
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assert(_acl_brand(acl_new) == ACL_BRAND_POSIX);
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if (have_mask_entry && recalculate_mask) {
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if (acl_calc_mask(&acl_new) == -1)
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return (NULL);
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}
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return (acl_new);
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}
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acl_t
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acl_strip_np(const acl_t aclp, int recalculate_mask)
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{
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switch (_acl_brand(aclp)) {
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case ACL_BRAND_NFS4:
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return (_nfs4_acl_strip_np(aclp, 0));
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case ACL_BRAND_POSIX:
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return (_posix1e_acl_strip_np(aclp, recalculate_mask));
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default:
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errno = EINVAL;
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return (NULL);
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}
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}
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/*
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* Return 1, if ACL is trivial, 0 otherwise.
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*
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* ACL is trivial, iff its meaning could be fully expressed using just file
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* mode. In other words, ACL is trivial iff it doesn't have "+" to the right
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* of the mode bits in "ls -l" output ;-)
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*/
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int
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acl_is_trivial_np(const acl_t aclp, int *trivialp)
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{
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acl_t tmpacl;
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int differs;
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if (aclp == NULL || trivialp == NULL) {
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errno = EINVAL;
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return (-1);
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}
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switch (_acl_brand(aclp)) {
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case ACL_BRAND_POSIX:
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if (aclp->ats_acl.acl_cnt == 3)
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*trivialp = 1;
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else
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*trivialp = 0;
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return (0);
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case ACL_BRAND_NFS4:
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/*
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* If the ACL has more than canonical six entries,
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* it's non trivial by definition.
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*/
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if (aclp->ats_acl.acl_cnt > 6) {
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*trivialp = 0;
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return (0);
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}
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/*
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* Calculate trivial ACL - using acl_strip_np(3) - and compare
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* with the original.
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*/
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tmpacl = _nfs4_acl_strip_np(aclp, 0);
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if (tmpacl == NULL)
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return (-1);
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differs = _acl_differs(aclp, tmpacl);
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acl_free(tmpacl);
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if (differs == 0) {
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*trivialp = 1;
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return (0);
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}
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/*
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* Try again with an old-style, "canonical six" trivial ACL.
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*/
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tmpacl = _nfs4_acl_strip_np(aclp, 1);
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if (tmpacl == NULL)
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return (-1);
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differs = _acl_differs(aclp, tmpacl);
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acl_free(tmpacl);
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if (differs)
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*trivialp = 0;
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else
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*trivialp = 1;
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return (0);
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default:
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errno = EINVAL;
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return (-1);
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}
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}
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