mirror of
https://github.com/Zeckmathederg/glfs.git
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2174baa3e8
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@3876 af4574ff-66df-0310-9fd7-8a98e5e911e0
241 lines
8.6 KiB
XML
241 lines
8.6 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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<!ENTITY tcpwrappers-download-http "http://files.ichilton.co.uk/nfs/tcp_wrappers_&tcpwrappers-version;.tar.gz">
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<!ENTITY tcpwrappers-download-ftp "ftp://ftp.porcupine.org/pub/security/tcp_wrappers_&tcpwrappers-version;.tar.gz">
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<!ENTITY tcpwrappers-md5sum "e6fa25f71226d090f34de3f6b122fb5a">
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<!ENTITY tcpwrappers-size "97 KB">
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<!ENTITY tcpwrappers-buildsize "1.09 MB">
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<!ENTITY tcpwrappers-time "0.03 SBU">
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]>
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<sect1 id="tcpwrappers" xreflabel="tcpwrappers-&tcpwrappers-version;">
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<?dbhtml filename="tcpwrappers.html"?>
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<sect1info>
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<othername>$LastChangedBy$</othername>
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<date>$Date$</date>
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</sect1info>
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<title>Tcpwrappers-&tcpwrappers-version;</title>
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<indexterm zone="tcpwrappers">
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<primary sortas="a-Tcpwrappers">Tcpwrappers</primary>
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</indexterm>
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<sect2 role="package">
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<title>Introduction to Tcpwrappers</title>
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<para>The <application>tcpwrappers</application> package provides daemon
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wrapper programs that report the name of the client requesting network
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services and the requested service.</para>
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<bridgehead renderas="sect3">Package Information</bridgehead>
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<itemizedlist spacing="compact">
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<listitem>
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<para>Download (HTTP): <ulink url="&tcpwrappers-download-http;"/></para>
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</listitem>
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<listitem>
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<para>Download (FTP): <ulink url="&tcpwrappers-download-ftp;"/></para>
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</listitem>
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<listitem>
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<para>Download MD5 sum: &tcpwrappers-md5sum;</para>
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</listitem>
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<listitem>
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<para>Download size: &tcpwrappers-size;</para>
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</listitem>
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<listitem>
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<para>Estimated disk space required: &tcpwrappers-buildsize;</para>
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</listitem>
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<listitem>
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<para>Estimated build time: &tcpwrappers-time;</para>
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</listitem>
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</itemizedlist>
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<bridgehead renderas="sect3">Additional Downloads</bridgehead>
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<itemizedlist spacing='compact'>
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<listitem>
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<para>Required Patch (Fixes some build issues and adds building of a
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shared library): <ulink
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url="&patch-root;/tcp_wrappers-&tcpwrappers-version;-shared_lib_plus_plus-1.patch"/></para>
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</listitem>
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</itemizedlist>
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</sect2>
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<sect2 role="installation">
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<title>Installation of Tcpwrappers</title>
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<para>Install <application>tcpwrappers</application> with the following
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commands:</para>
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<screen><userinput>patch -Np1 -i ../tcp_wrappers-&tcpwrappers-version;-shared_lib_plus_plus-1.patch &&
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sed -i -e "s,^extern char \*malloc();,/* & */," scaffold.c &&
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make REAL_DAEMON_DIR=/usr/sbin STYLE=-DPROCESS_OPTIONS linux</userinput></screen>
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<para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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<screen role="root"><userinput>make install</userinput></screen>
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</sect2>
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<sect2 role="commands">
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<title>Command Explanations</title>
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<para><command>sed -i -e ... scaffold.c</command>: This command removes an
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obsolete C declaration which causes the build to fail if using
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<application>GCC-3.4.x</application>.</para>
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</sect2>
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<sect2 role="configuration">
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<title>Configuring Tcpwrappers</title>
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<sect3 id="tcpwrappers-config">
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<title>Config Files</title>
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<para><filename>/etc/hosts.allow</filename> and
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<filename>/etc/hosts.deny</filename></para>
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<indexterm zone="tcpwrappers tcpwrappers-config">
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<primary sortas="e-etc-hosts.allow">/etc/hosts.allow</primary>
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</indexterm>
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<indexterm zone="tcpwrappers tcpwrappers-config">
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<primary sortas="e-etc-hosts.deny">/etc/hosts.deny</primary>
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</indexterm>
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<para>File protections: the wrapper, all files used by the wrapper,
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and all directories in the path leading to those files, should be
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accessible but not writable for unprivileged users (mode 755 or mode
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555). Do not install the wrapper set-uid.</para>
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<para>As the <systemitem class="username">root</systemitem> user,
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perform the following edits on the
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<filename>/etc/inetd.conf</filename> configuration file:</para>
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<indexterm zone="tcpwrappers tcpwrappers-config">
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<primary sortas="e-etc-inetd.conf">/etc/inetd.conf</primary>
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</indexterm>
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<screen><literal>finger stream tcp nowait nobody /usr/sbin/in.fingerd in.fingerd</literal></screen>
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<para>becomes:</para>
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<screen><literal>finger stream tcp nowait nobody /usr/sbin/tcpd in.fingerd</literal></screen>
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<note>
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<para>The <command>finger</command> server is used as an example here.</para>
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</note>
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<para>Similar changes must be made if <application>xinetd</application> is
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used, with the emphasis being on calling <command>/usr/sbin/tcpd</command>
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instead of calling the service daemon directly, and passing the name of the
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service daemon to <command>tcpd</command>.</para>
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<indexterm zone="tcpwrappers tcpwrappers-config">
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<primary sortas="e-etc-xinetd.conf">/etc/xinetd.conf</primary>
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</indexterm>
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</sect3>
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</sect2>
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<sect2 role="content">
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<title>Contents</title>
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<segmentedlist>
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<segtitle>Installed Programs</segtitle>
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<segtitle>Installed Library</segtitle>
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<segtitle>Installed Directories</segtitle>
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<seglistitem>
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<seg>tcpd, tcpdchk, tcpdmatch, try-from, and safe_finger</seg>
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<seg>libwrap.[so,a]</seg>
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<seg>None</seg>
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</seglistitem>
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</segmentedlist>
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<variablelist>
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<bridgehead renderas="sect3">Short Descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<?dbhtml list-presentation="table"?>
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<varlistentry id="tcpd">
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<term><command>tcpd</command></term>
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<listitem>
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<para>is the main access control daemon for all Internet services,
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which <command>inetd</command> or <command>xinetd</command>
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will run instead of running the requested service daemon.</para>
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<indexterm zone="tcpwrappers tcpd">
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<primary sortas="b-tcpd">tcpd</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="tcpdchk">
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<term><command>tcpdchk</command></term>
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<listitem>
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<para>is a tool to examine a <command>tcpd</command> wrapper
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configuration and report problems with it.</para>
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<indexterm zone="tcpwrappers tcpdchk">
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<primary sortas="b-tcpdchk">tcpdchk</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="tcpdmatch">
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<term><command>tcpdmatch</command></term>
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<listitem>
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<para>is used to predict how the TCP wrapper
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would handle a specific request for a service.</para>
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<indexterm zone="tcpwrappers tcpdmatch">
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<primary sortas="b-tcpdmatch">tcpdmatch</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="try-from">
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<term><command>try-from</command></term>
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<listitem>
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<para>can be called via a remote shell command to find out if the
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host name and address are properly recognized.</para>
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<indexterm zone="tcpwrappers try-from">
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<primary sortas="b-try-from">try-from</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="safe_finger">
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<term><command>safe_finger</command></term>
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<listitem>
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<para>is a wrapper for the <command>finger</command> utility, to
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provide automatic reverse name lookups.</para>
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<indexterm zone="tcpwrappers safe_finger">
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<primary sortas="b-safe_finger">safe_finger</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="libwrap">
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<term><filename class='libraryfile'>libwrap.[so,a]</filename></term>
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<listitem>
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<para>contains the API functions required by
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the <application>tcpwrappers</application> programs as well as other programs
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to become <quote><application>tcpwrappers</application>-aware</quote>.</para>
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<indexterm zone="tcpwrappers libwrap">
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<primary sortas="c-libwrap">libwrap.[so,a]</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect2>
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</sect1>
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