172 lines
5.1 KiB
Groff
172 lines
5.1 KiB
Groff
.\" $NetBSD: acl_valid.3,v 1.2 2020/06/18 19:46:34 wiz Exp $
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.\"-
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.\" Copyright (c) 2000, 2002 Robert N. M. Watson
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.\" All rights reserved.
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.\"
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.\" This software was developed by Robert Watson for the TrustedBSD Project.
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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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.\" $FreeBSD: head/lib/libc/posix1e/acl_valid.3 140288 2005-01-15 12:21:03Z ru $
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.\"
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.Dd December 29, 2002
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.Dt ACL_VALID 3
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.Os
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.Sh NAME
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.Nm acl_valid ,
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.Nm acl_valid_fd_np ,
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.Nm acl_valid_file_np ,
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.Nm acl_valid_link_np
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.Nd validate an ACL
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/acl.h
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.Ft int
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.Fn acl_valid "acl_t acl"
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.Ft int
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.Fn acl_valid_fd_np "int fd" "acl_type_t type" "acl_t acl"
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.Ft int
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.Fn acl_valid_file_np "const char *path_p" "acl_type_t type" "acl_t acl"
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.Ft int
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.Fn acl_valid_link_np "const char *path_p" "acl_type_t type" "acl_t acl"
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.Sh DESCRIPTION
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These functions check that the ACL referred to by the argument
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.Va acl
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is valid.
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The POSIX.1e routine,
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.Fn acl_valid ,
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checks this validity only with POSIX.1e ACL semantics, and irrespective
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of the context in which the ACL is to be used.
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The non-portable forms,
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.Fn acl_valid_fd_np ,
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.Fn acl_valid_file_np ,
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and
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.Fn acl_valid_link_np
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allow an ACL to be checked in the context of a specific acl type,
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.Va type ,
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and file system object.
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In environments where additional ACL types are
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supported than just POSIX.1e, this makes more sense.
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Whereas
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.Fn acl_valid_file_np
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will follow the symlink if the specified path is to a symlink,
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.Fn acl_valid_link_np
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will not.
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.Pp
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For POSIX.1e semantics, the checks include:
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.Bl -bullet
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.It
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The three required entries
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.Dv ( ACL_USER_OBJ , ACL_GROUP_OBJ ,
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and
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.Dv ACL_OTHER )
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shall exist exactly once in the ACL.
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If the ACL contains any
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.Dv ACL_USER , ACL_GROUP ,
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or any other
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implementation-defined entries in the file group class
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then one
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.Dv ACL_MASK
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entry shall also be required.
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The ACL shall contain at most one
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.Dv ACL_MASK
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entry.
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.It
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The qualifier field shall be unique among all entries of
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the same POSIX.1e ACL facility defined tag type.
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The
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tag type field shall contain valid values including any
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implementation-defined values.
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Validation of the values
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of the qualifier field is implementation-defined.
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.El
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.Pp
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The POSIX.1e
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.Fn acl_valid
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function may reorder the ACL for the purposes of verification; the
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non-portable validation functions will not.
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.Sh IMPLEMENTATION NOTES
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.Fx Ns 's
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support for POSIX.1e interfaces and features is still under
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development at this time.
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.Sh RETURN VALUES
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.Rv -std
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.Sh ERRORS
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If any of the following conditions occur, these functions shall return
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-1 and set
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.Va errno
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to the corresponding value:
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.Bl -tag -width Er
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix, or the
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object exists and the process does not have appropriate access rights.
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.It Bq Er EBADF
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The
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.Va fd
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argument is not a valid file descriptor.
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.It Bq Er EINVAL
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Argument
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.Va acl
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does not point to a valid ACL.
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.Pp
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One or more of the required ACL entries is not present in
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.Va acl .
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.Pp
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The ACL contains entries that are not unique.
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.Pp
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The file system rejects the ACL based on fs-specific semantics issues.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded 255 characters, or an
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entire path name exceeded 1023 characters.
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.It Bq Er ENOENT
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The named object does not exist, or the
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.Va path_p
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argument points to an empty string.
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.It Bq Er ENOMEM
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Insufficient memory available to fulfill request.
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.It Bq Er EOPNOTSUPP
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The file system does not support ACL retrieval.
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.El
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.Sh SEE ALSO
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.Xr acl 3 ,
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.Xr acl_get 3 ,
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.Xr acl_init 3 ,
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.Xr acl_set 3 ,
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.Xr posix1e 3
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.Sh STANDARDS
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POSIX.1e is described in IEEE POSIX.1e draft 17.
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Discussion
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of the draft continues on the cross-platform POSIX.1e implementation
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mailing list.
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To join this list, see the
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.Fx
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POSIX.1e implementation
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page for more information.
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.Sh HISTORY
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POSIX.1e support was introduced in
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.Fx 4.0 ,
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and development continues.
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.Sh AUTHORS
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.An Robert N M Watson
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