220 lines
6.5 KiB
Groff
220 lines
6.5 KiB
Groff
.\"-
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.\" Copyright (c) 1999-2001 Robert N. M. Watson
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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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.\" $FreeBSD$
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.\"
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.Dd September 18, 2009
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.Dt ACL 9
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.Os
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.Sh NAME
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.Nm acl
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.Nd virtual file system access control lists
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/vnode.h
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.In sys/acl.h
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.Pp
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In the kernel configuration file:
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.Cd "options UFS_ACL"
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.Sh DESCRIPTION
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Access control lists, or ACLs,
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allow fine-grained specification of rights
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for vnodes representing files and directories.
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However, as there are a plethora of file systems with differing ACL semantics,
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the vnode interface is aware only of the syntax of ACLs,
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relying on the underlying file system to implement the details.
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Depending on the underlying file system, each file or directory
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may have zero or more ACLs associated with it, named using the
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.Fa type
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field of the appropriate vnode ACL calls:
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.Xr VOP_ACLCHECK 9 ,
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.Xr VOP_GETACL 9 ,
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and
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.Xr VOP_SETACL 9 .
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.Pp
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Currently, each ACL is represented in-kernel by a fixed-size
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.Vt acl
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structure, defined as follows:
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.Bd -literal -offset indent
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struct acl {
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unsigned int acl_maxcnt;
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unsigned int acl_cnt;
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int acl_spare[4];
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struct acl_entry acl_entry[ACL_MAX_ENTRIES];
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};
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.Ed
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.Pp
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An ACL is constructed from a fixed size array of ACL entries,
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each of which consists of a set of permissions, principal namespace,
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and principal identifier.
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In this implementation, the
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.Vt acl_maxcnt
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field is always set to
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.Dv ACL_MAX_ENTRIES .
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.Pp
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Each individual ACL entry is of the type
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.Vt acl_entry_t ,
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which is a structure with the following members:
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.Bl -tag -width 2n
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.It Vt acl_tag_t Va ae_tag
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The following is a list of definitions of ACL types
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to be set in
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.Va ae_tag :
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.Pp
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.Bl -tag -width ".Dv ACL_UNDEFINED_FIELD" -offset indent -compact
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.It Dv ACL_UNDEFINED_FIELD
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Undefined ACL type.
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.It Dv ACL_USER_OBJ
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Discretionary access rights for processes whose effective user ID
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matches the user ID of the file's owner.
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.It Dv ACL_USER
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Discretionary access rights for processes whose effective user ID
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matches the ACL entry qualifier.
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.It Dv ACL_GROUP_OBJ
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Discretionary access rights for processes whose effective group ID
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or any supplemental groups
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match the group ID of the file's owner.
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.It Dv ACL_GROUP
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Discretionary access rights for processes whose effective group ID
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or any supplemental groups
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match the ACL entry qualifier.
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.It Dv ACL_MASK
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The maximum discretionary access rights that can be granted
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to a process in the file group class.
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This is only valid for POSIX.1e ACLs.
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.It Dv ACL_OTHER
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Discretionary access rights for processes not covered by any other ACL
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entry.
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This is only valid for POSIX.1e ACLs.
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.It Dv ACL_OTHER_OBJ
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Same as
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.Dv ACL_OTHER .
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.It Dv ACL_EVERYONE
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Discretionary access rights for all users.
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This is only valid for NFSv4 ACLs.
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.El
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.Pp
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Each POSIX.1e ACL must contain exactly one
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.Dv ACL_USER_OBJ ,
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one
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.Dv ACL_GROUP_OBJ ,
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and one
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.Dv ACL_OTHER .
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If any of
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.Dv ACL_USER ,
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.Dv ACL_GROUP ,
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or
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.Dv ACL_OTHER
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are present, then exactly one
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.Dv ACL_MASK
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entry should be present.
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.It Vt uid_t Va ae_id
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The ID of user for whom this ACL describes access permissions.
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For entries other than
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.Dv ACL_USER
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and
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.Dv ACL_GROUP ,
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this field should be set to
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.Dv ACL_UNDEFINED_ID .
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.It Vt acl_perm_t Va ae_perm
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This field defines what kind of access the process matching this ACL has
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for accessing the associated file.
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For POSIX.1e ACLs, the following are valid:
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.Bl -tag -width ".Dv ACL_WRITE_NAMED_ATTRS"
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.It Dv ACL_EXECUTE
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The process may execute the associated file.
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.It Dv ACL_WRITE
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The process may write to the associated file.
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.It Dv ACL_READ
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The process may read from the associated file.
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.It Dv ACL_PERM_NONE
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The process has no read, write or execute permissions
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to the associated file.
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.El
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.Pp
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For NFSv4 ACLs, the following are valid:
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.Bl -tag -width ".Dv ACL_WRITE_NAMED_ATTRS"
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.It Dv ACL_READ_DATA
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The process may read from the associated file.
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.It Dv ACL_LIST_DIRECTORY
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Same as
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.Dv ACL_READ_DATA .
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.It Dv ACL_WRITE_DATA
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The process may write to the associated file.
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.It Dv ACL_ADD_FILE
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Same as
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.Dv ACL_ACL_WRITE_DATA .
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.It Dv ACL_APPEND_DATA
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.It Dv ACL_ADD_SUBDIRECTORY
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Same as
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.Dv ACL_APPEND_DATA .
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.It Dv ACL_READ_NAMED_ATTRS
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Ignored.
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.It Dv ACL_WRITE_NAMED_ATTRS
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Ignored.
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.It Dv ACL_EXECUTE
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The process may execute the associated file.
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.It Dv ACL_DELETE_CHILD
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.It Dv ACL_READ_ATTRIBUTES
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.It Dv ACL_WRITE_ATTRIBUTES
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.It Dv ACL_DELETE
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.It Dv ACL_READ_ACL
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.It Dv ACL_WRITE_ACL
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.It Dv ACL_WRITE_OWNER
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.It Dv ACL_SYNCHRONIZE
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Ignored.
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.El
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.It Vt acl_entry_type_t Va ae_entry_type
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This field defines the type of NFSv4 ACL entry.
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It is not used with POSIX.1e ACLs.
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The following values are valid:
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.Bl -tag -width ".Dv ACL_WRITE_NAMED_ATTRS"
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.It Dv ACL_ENTRY_TYPE_ALLOW
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.It Dv ACL_ENTRY_TYPE_DENY
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.El
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.It Vt acl_flag_t Va ae_flags
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This field defines the inheritance flags of NFSv4 ACL entry.
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It is not used with POSIX.1e ACLs.
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The following values are valid:
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.Bl -tag -width ".Dv ACL_ENTRY_DIRECTORY_INHERIT"
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.It Dv ACL_ENTRY_FILE_INHERIT
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.It Dv ACL_ENTRY_DIRECTORY_INHERIT
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.It Dv ACL_ENTRY_NO_PROPAGATE_INHERIT
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.It Dv ACL_ENTRY_INHERIT_ONLY
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.El
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.El
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.Sh SEE ALSO
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.Xr acl 3 ,
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.Xr vaccess_acl_nfs4 9 ,
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.Xr vaccess_acl_posix1e 9 ,
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.Xr VFS 9 ,
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.Xr vaccess 9 ,
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.Xr VOP_ACLCHECK 9 ,
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.Xr VOP_GETACL 9 ,
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.Xr VOP_SETACL 9
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.Sh AUTHORS
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This manual page was written by
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.An Robert Watson .
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