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📁 Red Hat Linux 5.1安装指南
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<title>Controlling Access to Services</title>
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<h2><a NAME="s11.6"></a>11.6 控制对服务的存取</h2>

<p><a NAME="i668"></a><a NAME="i669"></a></p>

<p><a NAME="i670"></a><a NAME="i671"></a><a NAME="i672"></a>作为一种安全措施，大多数网络服务都由一个称为“TCP 
wrapper”的护卫性 程序控制着。凡是列于/etc/inetd.conf中的指定/usr/sbin/tcpd的服务都是受到保护的。 
tcpd可以根据请求者和/etc/hosts.allow,/etc/hosts.deny等配置文件来允许或拒绝对某一服务 
的存取。</p>

<p>在默认的情况下，红帽子LINUX允许任何服务请求。您可以通过编辑/etc/hosts.allow文件 
来拒绝或限制对服务的存取。下面是/etc/hosts.allow的一个例子：</p>

<p><a NAME="i673"></a></p>

<blockquote>
  <pre>ALL: redhat.com .redhat.com
in.talkd: ALL
in.ntalkd: ALL
in.fingerd: ALL
in.ftpd: ALL
</pre>
</blockquote>

<p>如上配置允许任何来自redhat.com和*.redhat.com机器的连接。它也允许来自任何机器的 
talk, finger, 和 ftp请求。</p>

<p>tcpd可以通过/etc/hosts.allow和/etc/hosts.deny的组合指定相当复杂的存取控制规则。请阅 
读tcpd(8)和hosts_access(5)的man手册获取详细信息 。</p>

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