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@@ -14,12 +14,12 @@
- OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- PERFORMANCE OF THIS SOFTWARE.
-->
-<!-- $Id: Bv9ARM.ch07.html,v 1.75.18.47 2006/05/17 02:38:43 marka Exp $ -->
+<!-- $Id: Bv9ARM.ch07.html,v 1.75.18.49 2006/06/29 13:03:03 marka Exp $ -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Chapter 7. BIND 9 Security Considerations</title>
-<meta name="generator" content="DocBook XSL Stylesheets V1.69.1">
+<meta name="generator" content="DocBook XSL Stylesheets V1.70.1">
<link rel="start" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual">
<link rel="up" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual">
<link rel="prev" href="Bv9ARM.ch06.html" title="Chapter 6. BIND 9 Configuration Reference">
@@ -28,7 +28,7 @@
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<div class="navheader">
<table width="100%" summary="Navigation header">
-<tr><th colspan="3" align="center">Chapter 7. <span class="acronym">BIND</span> 9 Security Considerations</th></tr>
+<tr><th colspan="3" align="center">Chapter 7. <acronym class="acronym">BIND</acronym> 9 Security Considerations</th></tr>
<tr>
<td width="20%" align="left">
<a accesskey="p" href="Bv9ARM.ch06.html">Prev</a> </td>
@@ -41,15 +41,15 @@
</div>
<div class="chapter" lang="en">
<div class="titlepage"><div><div><h2 class="title">
-<a name="Bv9ARM.ch07"></a>Chapter 7. <span class="acronym">BIND</span> 9 Security Considerations</h2></div></div></div>
+<a name="Bv9ARM.ch07"></a>Chapter 7. <acronym class="acronym">BIND</acronym> 9 Security Considerations</h2></div></div></div>
<div class="toc">
<p><b>Table of Contents</b></p>
<dl>
<dt><span class="sect1"><a href="Bv9ARM.ch07.html#Access_Control_Lists">Access Control Lists</a></span></dt>
-<dt><span class="sect1"><a href="Bv9ARM.ch07.html#id2573323"><span><strong class="command">chroot</strong></span> and <span><strong class="command">setuid</strong></span></a></span></dt>
+<dt><span class="sect1"><a href="Bv9ARM.ch07.html#id2597836"><span><strong class="command">chroot</strong></span> and <span><strong class="command">setuid</strong></span></a></span></dt>
<dd><dl>
-<dt><span class="sect2"><a href="Bv9ARM.ch07.html#id2573399">The <span><strong class="command">chroot</strong></span> Environment</a></span></dt>
-<dt><span class="sect2"><a href="Bv9ARM.ch07.html#id2573459">Using the <span><strong class="command">setuid</strong></span> Function</a></span></dt>
+<dt><span class="sect2"><a href="Bv9ARM.ch07.html#id2597981">The <span><strong class="command">chroot</strong></span> Environment</a></span></dt>
+<dt><span class="sect2"><a href="Bv9ARM.ch07.html#id2598041">Using the <span><strong class="command">setuid</strong></span> Function</a></span></dt>
</dl></dd>
<dt><span class="sect1"><a href="Bv9ARM.ch07.html#dynamic_update_security">Dynamic Update Security</a></span></dt>
</dl>
@@ -72,7 +72,7 @@
<p>
It is a <span class="emphasis"><em>good idea</em></span> to use ACLs, and to
control access to your server. Limiting access to your server by
- outside parties can help prevent spoofing and DoS attacks against
+ outside parties can help prevent spoofing and denial of service (DoS) attacks against
your server.
</p>
<p>
@@ -118,21 +118,21 @@ zone "example.com" {
</div>
<div class="sect1" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
-<a name="id2573323"></a><span><strong class="command">chroot</strong></span> and <span><strong class="command">setuid</strong></span></h2></div></div></div>
+<a name="id2597836"></a><span><strong class="command">chroot</strong></span> and <span><strong class="command">setuid</strong></span></h2></div></div></div>
<p>
- On UNIX servers, it is possible to run <span class="acronym">BIND</span> in a <span class="emphasis"><em>chrooted</em></span> environment
- (<span><strong class="command">chroot()</strong></span>) by specifying the "<code class="option">-t</code>"
- option. This can help improve system security by placing <span class="acronym">BIND</span> in
+ On UNIX servers, it is possible to run <acronym class="acronym">BIND</acronym> in a <span class="emphasis"><em>chrooted</em></span> environment
+ (using the <span><strong class="command">chroot()</strong></span> function) by specifying the "<code class="option">-t</code>"
+ option. This can help improve system security by placing <acronym class="acronym">BIND</acronym> in
a "sandbox", which will limit the damage done if a server is
compromised.
</p>
<p>
- Another useful feature in the UNIX version of <span class="acronym">BIND</span> is the
+ Another useful feature in the UNIX version of <acronym class="acronym">BIND</acronym> is the
ability to run the daemon as an unprivileged user ( <code class="option">-u</code> <em class="replaceable"><code>user</code></em> ).
We suggest running as an unprivileged user when using the <span><strong class="command">chroot</strong></span> feature.
</p>
<p>
- Here is an example command line to load <span class="acronym">BIND</span> in a <span><strong class="command">chroot()</strong></span> sandbox,
+ Here is an example command line to load <acronym class="acronym">BIND</acronym> in a <span><strong class="command">chroot</strong></span> sandbox,
<span><strong class="command">/var/named</strong></span>, and to run <span><strong class="command">named</strong></span> <span><strong class="command">setuid</strong></span> to
user 202:
</p>
@@ -141,15 +141,15 @@ zone "example.com" {
</p>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
-<a name="id2573399"></a>The <span><strong class="command">chroot</strong></span> Environment</h3></div></div></div>
+<a name="id2597981"></a>The <span><strong class="command">chroot</strong></span> Environment</h3></div></div></div>
<p>
In order for a <span><strong class="command">chroot</strong></span> environment
to
work properly in a particular directory
(for example, <code class="filename">/var/named</code>),
you will need to set up an environment that includes everything
- <span class="acronym">BIND</span> needs to run.
- From <span class="acronym">BIND</span>'s point of view, <code class="filename">/var/named</code> is
+ <acronym class="acronym">BIND</acronym> needs to run.
+ From <acronym class="acronym">BIND</acronym>'s point of view, <code class="filename">/var/named</code> is
the root of the filesystem. You will need to adjust the values of
options like
like <span><strong class="command">directory</strong></span> and <span><strong class="command">pid-file</strong></span> to account
@@ -169,7 +169,7 @@ zone "example.com" {
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
-<a name="id2573459"></a>Using the <span><strong class="command">setuid</strong></span> Function</h3></div></div></div>
+<a name="id2598041"></a>Using the <span><strong class="command">setuid</strong></span> Function</h3></div></div></div>
<p>
Prior to running the <span><strong class="command">named</strong></span> daemon,
use
@@ -178,7 +178,7 @@ zone "example.com" {
modification times) or the <span><strong class="command">chown</strong></span>
utility (to
set the user id and/or group id) on files
- to which you want <span class="acronym">BIND</span>
+ to which you want <acronym class="acronym">BIND</acronym>
to write.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
@@ -195,7 +195,7 @@ zone "example.com" {
<p>
Access to the dynamic
update facility should be strictly limited. In earlier versions of
- <span class="acronym">BIND</span> the only way to do this was
+ <acronym class="acronym">BIND</acronym>, the only way to do this was
based on the IP
address of the host requesting the update, by listing an IP address
or
@@ -222,7 +222,7 @@ zone "example.com" {
option can be used.
</p>
<p>
- Some sites choose to keep all dynamically updated DNS data
+ Some sites choose to keep all dynamically-updated DNS data
in a subdomain and delegate that subdomain to a separate zone. This
way, the top-level zone containing critical data such as the IP
addresses
@@ -242,7 +242,7 @@ zone "example.com" {
</td>
</tr>
<tr>
-<td width="40%" align="left" valign="top">Chapter 6. <span class="acronym">BIND</span> 9 Configuration Reference </td>
+<td width="40%" align="left" valign="top">Chapter 6. <acronym class="acronym">BIND</acronym> 9 Configuration Reference </td>
<td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td>
<td width="40%" align="right" valign="top"> Chapter 8. Troubleshooting</td>
</tr>