samba-mirror/docs-xml/manpages/vfs_nfs4acl_xattr.8.xml

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<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
<refentry id="vfs_nfs4acl_xattr.8">

  <refmeta>
    <refentrytitle>vfs_nfs4acl_xattr</refentrytitle>
    <manvolnum>8</manvolnum>
    <refmiscinfo class="source">Samba</refmiscinfo>
    <refmiscinfo class="manual">System Administration tools</refmiscinfo>
    <refmiscinfo class="version">&doc.version;</refmiscinfo>
  </refmeta>


  <refnamediv>
    <refname>vfs_nfs4acl_xattr</refname>
    <refpurpose>Save NTFS-ACLs as NFS4 encoded blobs in extended
    attributes</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>vfs objects = nfs4acl_xattr</command>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>DESCRIPTION</title>

    <para>This VFS module is part of the
    <citerefentry><refentrytitle>samba</refentrytitle>
    <manvolnum>7</manvolnum></citerefentry> suite.</para>

    <para>The <command>vfs_acl_xattr</command> VFS module stores NTFS Access
    Control Lists (ACLs) in Extended Attributes (EAs/xattrs).  This enables the
    full mapping of Windows ACLs on Samba servers.
    </para>

    <para>This module is stackable.</para>
  </refsect1>


  <refsect1>
    <title>OPTIONS</title>

    <variablelist>

      <varlistentry>
	<term>nfs4acl_xattr:encoding = [nfs|ndr|xdr]</term>
	<listitem>
	  <para>This parameter configures the marshaling format used in the ACL
	  blob and the default extended attribute name used to store the blob.
	  </para>

	  <para>When set to <emphasis>nfs</emphasis> - fetch and store the NT
	  ACL in NFS 4.0 or 4.1 compatible XDR encoding. By default this uses
	  the extended attribute "system.nfs4_acl". This setting also
	  disables <emphasis>validate_mode</emphasis>.</para>

	  <para>When set to <emphasis>ndr (default)</emphasis> - store the NT
	  ACL with POSIX draft NFSv4 compatible NDR encoding. By default this
	  uses the extended attribute "security.nfs4acl_ndr".</para>

	  <para>When set to <emphasis>xdr</emphasis> - store the NT ACL in a
	  format similar to NFS 4.1 RFC 5661 in XDR encoding. The main
	  differences to RFC 5661 are the use of ids instead of strings as users
	  and group identifiers and an additional attribute per nfsace4. By
	  default this encoding stores the blob in the extended attribute
	  "security.nfs4acl_xdr".</para>
	</listitem>
      </varlistentry>

      <varlistentry>
	<term>nfs4acl_xattr:version = [40|41]</term>
	<listitem>
	  <para>This parameter configures the NFS4 ACL level. Only
	  <emphasis>41</emphasis> fully supports mapping NT ACLs and should be
	  used. The default is <emphasis>41</emphasis>.</para>
	</listitem>
      </varlistentry>

      <varlistentry>
	<term>nfs4acl_xattr:default acl style = [posix|windows|everyone]</term>
	<listitem>
	  <para>This parameter determines the type of ACL that is synthesized in
	  case a file or directory lacks an ACL extended attribute.</para>

	  <para>When set to <emphasis>posix</emphasis>, an ACL will be
	  synthesized based on the POSIX mode permissions for user, group and
	  others, with an additional ACE for <emphasis>NT
	  Authority\SYSTEM</emphasis> will full rights.</para>

	  <para>When set to <emphasis>windows</emphasis>, an ACL is synthesized
	  the same way Windows does it, only including permissions for the owner
	  and <emphasis>NT Authority\SYSTEM</emphasis>.</para>

	  <para>When set to <emphasis>everyone</emphasis>, an ACL is synthesized
	  giving full permissions to everyone (S-1-1-0).</para>

	  <para>The default for this option is
	  <emphasis>everyone</emphasis>.</para>
	</listitem>
      </varlistentry>

      <varlistentry>
	<term>nfs4acl_xattr:xattr_name = STRING</term>
	<listitem>
	  <para>This parameter configures the extended attribute name used to
	  store the marshaled ACL.</para>
	  <para>The default depends on the setting for
	  <emphasis>nfs4acl_xattr:encoding</emphasis>.</para>
	</listitem>
      </varlistentry>

      <varlistentry>
	<term>nfs4acl_xattr:nfs4_id_numeric = yes|no (default: no)</term>
	<listitem>
	  <para>This parameter tells the module how the NFS4 server encodes user
	  and group identifiers on the network. With the default setting the
	  module expects identifiers encoded as per the NFS4 RFC as
	  user@domain.</para>
	  <para>When set to <emphasis>yes</emphasis>, the module expects the
	  identifiers as numeric string.</para>
	  <para>The default for this options<emphasis>no</emphasis>.</para>
	</listitem>
      </varlistentry>

      <varlistentry>
	<term>nfs4acl_xattr:validate_mode = yes|no</term>
	<listitem>
	  <para>This parameter configures whether the module enforces the POSIX
	  mode is set to 0777 for directories and 0666 for files. If this
	  constrained is not met, the xattr with the ACL blob is
	  discarded.</para>
	  <para>The default depends on the setting for
	  <emphasis>nfs4acl_xattr:encoding</emphasis>: when set to
	  <emphasis>nfs</emphasis> this setting is disabled by default,
	  otherwise it is enabled.</para>
	</listitem>
      </varlistentry>

    </variablelist>
  </refsect1>

  <refsect1>
    <title>EXAMPLES</title>

    <para>A directory can be exported via Samba using this module as
    follows:</para>

    <programlisting>
      <smbconfsection name="[samba_gpfs_share]"/>
      <smbconfoption name="vfs objects">nfs4acl_xattr</smbconfoption>
      <smbconfoption name="path">/foo/bar</smbconfoption>
    </programlisting>
  </refsect1>

  <refsect1>
    <title>AUTHOR</title>

    <para>The original Samba software and related utilities
    were created by Andrew Tridgell. Samba is now developed
    by the Samba Team as an Open Source project similar
    to the way the Linux kernel is developed.</para>
  </refsect1>

</refentry>