f773ff5a87
introduce a new argument, "namespace", rather than relying on a first-
character namespace indicator. This is in line with more recent
thinking on EA interfaces on various mailing lists, including the
posix1e, Linux acl-devel, and trustedbsd-discuss forums. Two namespaces
are defined by default, EXTATTR_NAMESPACE_SYSTEM and
EXTATTR_NAMESPACE_USER, where the primary distinction lies in the
access control model: user EAs are accessible based on the normal
MAC and DAC file/directory protections, and system attributes are
limited to kernel-originated or appropriately privileged userland
requests.
o These API changes occur at several levels: the namespace argument is
introduced in the extattr_{get,set}_file() system call interfaces,
at the vnode operation level in the vop_{get,set}extattr() interfaces,
and in the UFS extended attribute implementation. Changes are also
introduced in the VFS extattrctl() interface (system call, VFS,
and UFS implementation), where the arguments are modified to include
a namespace field, as well as modified to advoid direct access to
userspace variables from below the VFS layer (in the style of recent
changes to mount by adrian@FreeBSD.org). This required some cleanup
and bug fixing regarding VFS locks and the VFS interface, as a vnode
pointer may now be optionally submitted to the VFS_EXTATTRCTL()
call. Updated documentation for the VFS interface will be committed
shortly.
o In the near future, the auto-starting feature will be updated to
search two sub-directories to the ".attribute" directory in appropriate
file systems: "user" and "system" to locate attributes intended for
those namespaces, as the single filename is no longer sufficient
to indicate what namespace the attribute is intended for. Until this
is committed, all attributes auto-started by UFS will be placed in
the EXTATTR_NAMESPACE_SYSTEM namespace.
o The default POSIX.1e attribute names for ACLs and Capabilities have
been updated to no longer include the '$' in their filename. As such,
if you're using these features, you'll need to rename the attribute
backing files to the same names without '$' symbols in front.
o Note that these changes will require changes in userland, which will
be committed shortly. These include modifications to the extended
attribute utilities, as well as to libutil for new namespace
string conversion routines. Once the matching userland changes are
committed, a buildworld is recommended to update all the necessary
include files and verify that the kernel and userland environments
are in sync. Note: If you do not use extended attributes (most people
won't), upgrading is not imperative although since the system call
API has changed, the new userland extended attribute code will no longer
compile with old include files.
o Couple of minor cleanups while I'm there: make more code compilation
conditional on FFS_EXTATTR, which should recover a bit of space on
kernels running without EA's, as well as update copyright dates.
Obtained from: TrustedBSD Project
72 lines
2.7 KiB
C
72 lines
2.7 KiB
C
/*-
|
|
* Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
/*
|
|
* Userland/kernel interface for Extended File System Attributes
|
|
*
|
|
* This code from the FreeBSD POSIX.1e implementation. While the syscalls
|
|
* are fully implemented, invoking the VFS vnops and VFS calls as necessary,
|
|
* no file systems shipped with this version of FreeBSD implement these
|
|
* calls. Extensions to UFS/FFS to support extended attributes are
|
|
* available from the POSIX.1e implementation page, or possibly in a more
|
|
* recent version of FreeBSD.
|
|
*
|
|
* The POSIX.1e implementation page may be reached at:
|
|
* http://www.watson.org/fbsd-hardening/posix1e/
|
|
*/
|
|
|
|
#ifndef _SYS_EXTATTR_H_
|
|
#define _SYS_EXTATTR_H_
|
|
|
|
#define EXTATTR_NAMESPACE_USER 0x00000001
|
|
#define EXTATTR_NAMESPACE_USER_STRING "user"
|
|
#define EXTATTR_NAMESPACE_SYSTEM 0x00000002
|
|
#define EXTATTR_NAMESPACE_SYSTEM_STRING "system"
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#define EXTATTR_MAXNAMELEN NAME_MAX
|
|
|
|
#else
|
|
#include <sys/cdefs.h>
|
|
|
|
struct iovec;
|
|
|
|
__BEGIN_DECLS
|
|
int extattrctl(const char *path, int cmd, const char *filename,
|
|
int namespace, const char *attrname);
|
|
int extattr_delete_file(const char *path, int namespace,
|
|
const char *attrname);
|
|
int extattr_get_file(const char *path, int namespace,
|
|
const char *attrname, struct iovec *iovp, unsigned iovcnt);
|
|
int extattr_set_file(const char *path, int namespace,
|
|
const char *attrname, struct iovec *iovp, unsigned iovcnt);
|
|
__END_DECLS
|
|
|
|
#endif /* !_KERNEL */
|
|
#endif /* !_SYS_EXTATTR_H_ */
|