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<pre class="sourcecodebox">/*
File: main.c
Abstract: Tool which will remove inherited ACEs from a file system object
(demonstrating File Manager ACL support).
Version: 1.0
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("Apple") in consideration of your agreement to the following terms, and your
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under Apple's
copyrights in this original Apple software (the "Apple Software"), to use,
reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions of
the Apple Software. Neither the name, trademarks, service marks or logos of
Apple Computer, Inc. may be used to endorse or promote products derived from the
Apple Software without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or implied,
are granted by Apple herein, including but not limited to any patent rights that
may be infringed by your derivative works or by other works in which the Apple
Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Copyright © 2005 Apple Computer, Inc., All Rights Reserved
*/
#include <CoreServices/CoreServices.h>
#include <stdio.h>
#include <sys/acl.h>
// this routine uses the acl_t API to run through the ACL and remove any
// entry that is marked as inherited. It will set aclChanged to true
// if any entries are actually removed.
static int RemoveInheritedEntriesFromACL(acl_t theACL, Boolean *aclChanged, Boolean *aclNowEmpty)
{
int result = 0, getEntryResult;
acl_entry_t entry;
acl_flagset_t flags;
// loop through all the ACEs, starting at the beginning
getEntryResult = acl_get_entry(theACL, ACL_FIRST_ENTRY, &entry);
for (getEntryResult = acl_get_entry(theACL, ACL_FIRST_ENTRY, &entry); getEntryResult == 0; getEntryResult = acl_get_entry(theACL, ACL_NEXT_ENTRY, &entry))
{
// get the flagset and check for the ACL_ENTRY_INHERITED flag - if present delete the entry
if (acl_get_flagset_np(entry, &flags) == 0)
{
if (acl_get_flag_np(flags, ACL_ENTRY_INHERITED) != 0)
{
result = acl_delete_entry(theACL, entry);
if (result == 0)
*aclChanged = true;
else
break;
}
}
}
// if anything was removed check to see if the acl is empty
if ((aclChanged) && (result == 0))
{
// if we can get the first entry then there is at least one left...
*aclNowEmpty = (acl_get_entry(theACL, ACL_FIRST_ENTRY, &entry) == 0) ? false : true;
}
return result;
}
static OSStatus RemoveInheritedEntriesFromObject(const FSRef *ref, Boolean *aclChanged)
{
FSCatalogInfo info;
OSStatus err;
// nothing has changed yet
*aclChanged = false;
// get an FSFileSecurityRef for the object
err = FSGetCatalogInfo(ref, kFSCatInfoFSFileSecurityRef, &info, NULL, NULL, NULL);
if (err == noErr)
{
// we have a valid FSFileSecurityRef or NULL.
// NULL will be returned if the item has no extened secutiry info (which will
// always be the case for a volume with extended security disabled).
FSFileSecurityRef fileSecRef = ((FSPermissionInfo *) info.permissions)->fileSec;
if (fileSecRef != NULL)
{
acl_t theACL;
// get a copy of the access control list
err = FSFileSecurityCopyAccessControlList(fileSecRef, &theACL);
if (err == noErr)
{
Boolean aclNowEmpty;
int result = RemoveInheritedEntriesFromACL(theACL, aclChanged, &aclNowEmpty);
if (result == 0)
{
// now the inherited entries are gone, so we need to update the FSSecurityRef and then
// set it back on the file system object. The FSFileSecuritySetAccessControlList call
// is necessary since we operated on a copy of the access control list
if (*aclChanged)
{
if (!aclNowEmpty)
err = FSFileSecuritySetAccessControlList(fileSecRef, theACL);
else // if the acl is empty then remove it (all entries were inherited)
err = FSFileSecuritySetAccessControlList(fileSecRef, kFSFileSecurityRemoveACL);
if (err == noErr)
{
err = FSSetCatalogInfo(ref, kFSCatInfoFSFileSecurityRef, &info);
if (err != noErr)
printf("FSSetCatalogInfo returned %ld\n", err);
}
else
printf("FSFileSecuritySetAccessControlList returned %ld\n", err);
}
else // if nothing changed then no need to set it back
err = noErr;
}
else
{
printf("RemoveInheritedEntriesFromACL returned %d\n", result);
err = ioErr; // return something other than noErr
}
// free our copy of the acl
acl_free(theACL);
}
else if (err == errFSPropertyNotValid) // errFSPropertyNotValid means no acl, so no entries need to be removed
err = noErr;
else
printf("FSFileSecurityCopyAccessControlList returned %ld\n", err);
// need to release the fileSecRef
CFRelease(fileSecRef);
}
else // no info, so no inherited entries to remove
err = noErr;
}
else
printf("FSGetCatalogInfo returned %ld\n", err);
return err;
}
int main (int argc, const char * argv[]) {
if (argc == 2)
{
FSRef ref;
OSStatus err;
err = FSPathMakeRef((UInt8 *)argv[1], &ref, NULL);
if (err == noErr)
{
Boolean aclChanged;
err = RemoveInheritedEntriesFromObject(&ref, &aclChanged);
if (err == noErr)
{
if (aclChanged)
printf("Inherited entries removed from %s\n", argv[1]);
else
printf("No inherited entried found on %s\n", argv[1]);
}
else
printf("RemoveInheritedEntries returned %ld for %s\n", err, argv[1]);
}
else
printf("FSPathMakeRef returned %ld for %s [%ld]\n", err, argv[1]);
}
else
printf("usage: %s path\nThis tool will remove any inherited ACEs from the item specified by path\n", argv[0]);
return 0;
}
</pre>
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