/usr/share/doc/mailutils-doc/mailutils.html/Tcp

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Published by the Free Software Foundation,
51 Franklin Street, Fifth Floor
Boston, MA 02110-1301, USA

Copyright (C) 1999-2004, 2008-2012 Free Software Foundation,
Inc.

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover, and no Back-Cover texts.
A copy of the license is included in the section entitled "GNU Free
Documentation License". -->
<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
<head>
<title>GNU Mailutils Manual: Tcp-wrappers Statement</title>

<meta name="description" content="GNU Mailutils Manual: Tcp-wrappers Statement">
<meta name="keywords" content="GNU Mailutils Manual: Tcp-wrappers Statement">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="index.html#Top" rel="start" title="Top">
<link href="Function-Index.html#Function-Index" rel="index" title="Function Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="configuration.html#configuration" rel="up" title="configuration">
<link href="Server-Settings.html#Server-Settings" rel="next" title="Server Settings">
<link href="ACL-Statement.html#ACL-Statement" rel="prev" title="ACL Statement">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.indentedblock {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
div.smalllisp {margin-left: 3.2em}
kbd {font-style:oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nocodebreak {white-space:nowrap}
span.nolinebreak {white-space:nowrap}
span.roman {font-family:serif; font-weight:normal}
span.sansserif {font-family:sans-serif; font-weight:normal}
ul.no-bullet {list-style: none}
-->
</style>


</head>

<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
<a name="Tcp_002dwrappers-Statement"></a>
<div class="header">
<p>
Next: <a href="Server-Settings.html#Server-Settings" accesskey="n" rel="next">Server Settings</a>, Previous: <a href="ACL-Statement.html#ACL-Statement" accesskey="p" rel="prev">ACL Statement</a>, Up: <a href="configuration.html#configuration" accesskey="u" rel="up">configuration</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Tcp_002dwrappers-Statement-1"></a>
<h4 class="subsection">3.2.9 Tcp-wrappers Statement</h4>
<table class="cartouche" border="1"><tr><td>
<div align="center"><strong>Editor&rsquo;s note:</strong>
</div><p>The information in this node may be obsolete or
otherwise inaccurate.  This message will disappear, once this node revised.
</p></td></tr></table>
<a name="index-tcp_002dwrappers"></a>
<a name="Syntax-8"></a>
<h4 class="subheading">Syntax</h4>
<div class="example">
<pre class="example">tcp-wrappers {
  # <span class="roman">Enable TCP wrapper access control.</span>
  enable <var>bool</var>;
  # <span class="roman">Set daemon name for TCP wrapper lookups.</span>
  daemon <var>name</var>;
  # <span class="roman">Use <var>file</var> for positive client address access control.</span>
  allow-table <var>file</var>;
  # <span class="roman">Use file for negative client address access control.</span>
  deny-table <var>file</var>;
  # <span class="roman">Log allowed accesses at this syslog priority.</span>
  allow-syslog-priority <var>prio</var>;
  # <span class="roman">Log denied accesses at this syslog priority.</span>
  deny-syslog-priority <var>prio</var>;
}
</pre></div>

<a name="Description"></a>
<h4 class="subsection">3.2.10 Description</h4>
<p>The <code>tcp-wrappers</code> statements provides an alternative way to
control accesses to the resources served by GNU Mailutils.  This
statement is enabled if Mailutils is compiled with TCP wrappers
library <code>libwrap</code>.
</p>
<p>Access control using TCP wrappers is based on two files, called
<em>tables</em>, containing access rules.  There are two tables: the
<em>allow table</em>, usually stored in file <samp>/etc/hosts.allow</samp>, and
the <em>deny table</em>, kept in file <samp>/etc/hosts.deny</samp>.  The rules
in each table begin with an identifier called <em>daemon name</em>.  Each
utility wishing to verify a connection, select the entries having
its daemon name from the allow table.  A connection is allowed if it
matches any of these entries.  Otherwise, the utility retrieves all
entries with its daemon name from the deny table.  If any of these
matches the connection, then it is refused.  Otherwise, if neither
table contains matching entries, the connection is allowed.
</p>
<p>Description of a TCP wrapper table format lies outside the scope of
this document.  Please, see <a href="../hosts_access(5)/ACCESS-CONTROL-FILES.html#ACCESS-CONTROL-FILES">ACCESS CONTROL FILES</a> in <cite>hosts_access(5) man page</cite>, for details.
</p>
<dl>
<dt><a name="index-enable"></a>Configuration: <strong>enable</strong> <em><var>bool</var></em></dt>
<dd><p>Enable access control using TCP wrappers.  It is on by default.
</p></dd></dl>

<dl>
<dt><a name="index-daemon"></a>Configuration: <strong>daemon</strong> <em><var>name</var></em></dt>
<dd><p>Set daemon name for TCP wrapper lookups.  By default, the name of the
utility is used.  E.g.  <code>imap4d</code> uses &lsquo;<samp>imap4d</samp>&rsquo; as the
daemon name.
</p></dd></dl>

<dl>
<dt><a name="index-allow_002dtable"></a>Configuration: <strong>allow-table</strong> <em><var>file</var></em></dt>
<dd><p>Use <var>file</var> as allow table.  By default, <samp>/etc/hosts.allow</samp> is
used. 
</p></dd></dl>
  
<dl>
<dt><a name="index-deny_002dtable"></a>Configuration: <strong>deny-table</strong> <em><var>file</var></em></dt>
<dd><p>Use <var>file</var> as negative table.  By default, <samp>/etc/hosts.deny</samp>
is used.
</p></dd></dl>

<dl>
<dt><a name="index-allow_002dsyslog_002dpriority"></a>Configuration: <strong>allow-syslog-priority</strong> <em><var>prio</var>;</em></dt>
<dd><p>Log allowed accesses using syslog priority <var>prio</var>.
</p></dd></dl>

<dl>
<dt><a name="index-deny_002dsyslog_002dpriority"></a>Configuration: <strong>deny-syslog-priority</strong> <em><var>prio</var>;</em></dt>
<dd><p>Log denied accesses using syslog priority <var>prio</var>.
</p></dd></dl>

<hr>
<div class="header">
<p>
Next: <a href="Server-Settings.html#Server-Settings" accesskey="n" rel="next">Server Settings</a>, Previous: <a href="ACL-Statement.html#ACL-Statement" accesskey="p" rel="prev">ACL Statement</a>, Up: <a href="configuration.html#configuration" accesskey="u" rel="up">configuration</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
</div>



</body>
</html>
mailutils-doc 1:2.99.98-2 / usr / share / doc / mailutils-doc / mailutils.html / Tcp_002dwrappers-Statement.html
