[d47e7ea9] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[d47e7ea9] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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[f2d2b62] | 7 | <!ENTITY tcpwrappers-download-http " ">
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[4f6275fd] | 8 | <!ENTITY tcpwrappers-download-ftp "ftp://ftp.porcupine.org/pub/security/tcp_wrappers_&tcpwrappers-version;.tar.gz">
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[0d1d489] | 9 | <!ENTITY tcpwrappers-md5sum "e6fa25f71226d090f34de3f6b122fb5a">
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[b0c67c8b] | 10 | <!ENTITY tcpwrappers-size "97 KB">
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[c18c49fe] | 11 | <!ENTITY tcpwrappers-buildsize "1.09 MB">
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[17d22d99] | 12 | <!ENTITY tcpwrappers-time "less than 0.1 SBU">
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[d47e7ea9] | 13 | ]>
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| 14 |
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[fcc6d60] | 15 | <sect1 id="tcpwrappers" xreflabel="TCP Wrappers-&tcpwrappers-version;">
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[0d1d489] | 16 | <?dbhtml filename="tcpwrappers.html"?>
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[bab92281] | 17 |
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[0d1d489] | 18 | <sect1info>
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| 19 | <othername>$LastChangedBy$</othername>
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| 20 | <date>$Date$</date>
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| 21 | </sect1info>
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[bab92281] | 22 |
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[fcc6d60] | 23 | <title>TCP Wrappers-&tcpwrappers-version;</title>
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[bab92281] | 24 |
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[0d1d489] | 25 | <indexterm zone="tcpwrappers">
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[17d22d99] | 26 | <primary sortas="a-TCP Wrapper">TCP Wrapper</primary>
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[0d1d489] | 27 | </indexterm>
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| 28 |
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| 29 | <sect2 role="package">
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[fcc6d60] | 30 | <title>Introduction to TCP Wrappers</title>
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[0d1d489] | 31 |
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[17d22d99] | 32 | <para>The <application>TCP Wrapper</application> package provides daemon
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[17e6d48] | 33 | wrapper programs that report the name of the client requesting network
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[0d7900a] | 34 | services and the requested service. This capability is obsolete in
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[f2d2b62] | 35 | a modern environment, but several applications still use the library
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| 36 | and associated configuration files.</para>
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[bab92281] | 37 |
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[fcc6d60] | 38 | &lfs70_checked;
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[bd32b6fd] | 39 |
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[0d1d489] | 40 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 41 | <itemizedlist spacing="compact">
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| 42 | <listitem>
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| 43 | <para>Download (HTTP): <ulink url="&tcpwrappers-download-http;"/></para>
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| 44 | </listitem>
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| 45 | <listitem>
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| 46 | <para>Download (FTP): <ulink url="&tcpwrappers-download-ftp;"/></para>
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| 47 | </listitem>
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| 48 | <listitem>
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| 49 | <para>Download MD5 sum: &tcpwrappers-md5sum;</para>
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| 50 | </listitem>
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| 51 | <listitem>
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| 52 | <para>Download size: &tcpwrappers-size;</para>
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| 53 | </listitem>
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| 54 | <listitem>
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| 55 | <para>Estimated disk space required: &tcpwrappers-buildsize;</para>
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| 56 | </listitem>
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| 57 | <listitem>
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[2174baa] | 58 | <para>Estimated build time: &tcpwrappers-time;</para>
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| 59 | </listitem>
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[0d1d489] | 60 | </itemizedlist>
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[bab92281] | 61 |
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[0d1d489] | 62 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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| 63 | <itemizedlist spacing='compact'>
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| 64 | <listitem>
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[17d22d99] | 65 | <para>Required Patch (Fixes some build issues and adds building a
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[17e6d48] | 66 | shared library): <ulink
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[0d1d489] | 67 | url="&patch-root;/tcp_wrappers-&tcpwrappers-version;-shared_lib_plus_plus-1.patch"/></para>
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| 68 | </listitem>
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| 69 | </itemizedlist>
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[bab92281] | 70 |
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[061ec9d] | 71 | <para condition="html" role="usernotes">User Notes:
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| 72 | <ulink url="&blfs-wiki;/tcpwrappers"/></para>
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| 73 |
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[0d1d489] | 74 | </sect2>
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[bab92281] | 75 |
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[0d1d489] | 76 | <sect2 role="installation">
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[fcc6d60] | 77 | <title>Installation of TCP Wrappers</title>
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[0d1d489] | 78 |
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[17d22d99] | 79 | <para>Install <application>TCP Wrapper</application> with the following
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[0d1d489] | 80 | commands:</para>
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| 81 |
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| 82 | <screen><userinput>patch -Np1 -i ../tcp_wrappers-&tcpwrappers-version;-shared_lib_plus_plus-1.patch &&
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[0e92f49] | 83 | sed -i -e "s,^extern char \*malloc();,/* & */," scaffold.c &&
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[0d1d489] | 84 | make REAL_DAEMON_DIR=/usr/sbin STYLE=-DPROCESS_OPTIONS linux</userinput></screen>
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[bab92281] | 85 |
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[17d22d99] | 86 | <para>This package does not come with a test suite.</para>
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| 87 |
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[0d1d489] | 88 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[bab92281] | 89 |
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[0d1d489] | 90 | <screen role="root"><userinput>make install</userinput></screen>
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[bab92281] | 91 |
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[0d1d489] | 92 | </sect2>
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[bab92281] | 93 |
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[0d1d489] | 94 | <sect2 role="commands">
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| 95 | <title>Command Explanations</title>
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[bab92281] | 96 |
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[17e6d48] | 97 | <para><command>sed -i -e ... scaffold.c</command>: This command removes an
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| 98 | obsolete C declaration which causes the build to fail if using
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[5389ced] | 99 | <application>GCC >= 3.4.x</application>.</para>
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[bab92281] | 100 |
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[0d1d489] | 101 | </sect2>
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[bab92281] | 102 |
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[0d1d489] | 103 | <sect2 role="configuration">
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[fcc6d60] | 104 | <title>Configuring TCP Wrappers</title>
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[0d1d489] | 105 |
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| 106 | <sect3 id="tcpwrappers-config">
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| 107 | <title>Config Files</title>
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[bab92281] | 108 |
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[17e6d48] | 109 | <para><filename>/etc/hosts.allow</filename> and
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[0d1d489] | 110 | <filename>/etc/hosts.deny</filename></para>
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[bab92281] | 111 |
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[0d1d489] | 112 | <indexterm zone="tcpwrappers tcpwrappers-config">
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| 113 | <primary sortas="e-etc-hosts.allow">/etc/hosts.allow</primary>
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| 114 | </indexterm>
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[bab92281] | 115 |
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[0d1d489] | 116 | <indexterm zone="tcpwrappers tcpwrappers-config">
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| 117 | <primary sortas="e-etc-hosts.deny">/etc/hosts.deny</primary>
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| 118 | </indexterm>
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[f2d2b62] | 119 | <!--
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[0d1d489] | 120 | <para>File protections: the wrapper, all files used by the wrapper,
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| 121 | and all directories in the path leading to those files, should be
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| 122 | accessible but not writable for unprivileged users (mode 755 or mode
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| 123 | 555). Do not install the wrapper set-uid.</para>
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[bab92281] | 124 |
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[17e6d48] | 125 | <para>As the <systemitem class="username">root</systemitem> user,
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[0d1d489] | 126 | perform the following edits on the
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| 127 | <filename>/etc/inetd.conf</filename> configuration file:</para>
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[bab92281] | 128 |
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[0d1d489] | 129 | <indexterm zone="tcpwrappers tcpwrappers-config">
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| 130 | <primary sortas="e-etc-inetd.conf">/etc/inetd.conf</primary>
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| 131 | </indexterm>
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| 132 |
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| 133 | <screen><literal>finger stream tcp nowait nobody /usr/sbin/in.fingerd in.fingerd</literal></screen>
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| 134 |
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| 135 | <para>becomes:</para>
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[bab92281] | 136 |
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[0d1d489] | 137 | <screen><literal>finger stream tcp nowait nobody /usr/sbin/tcpd in.fingerd</literal></screen>
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| 138 |
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| 139 | <note>
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| 140 | <para>The <command>finger</command> server is used as an example here.</para>
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| 141 | </note>
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[f2d2b62] | 142 |
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[17e6d48] | 143 | <para>Similar changes must be made if <application>xinetd</application> is
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[bab92281] | 144 | used, with the emphasis being on calling <command>/usr/sbin/tcpd</command>
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[17e6d48] | 145 | instead of calling the service daemon directly, and passing the name of the
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[0d1d489] | 146 | service daemon to <command>tcpd</command>.</para>
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[bab92281] | 147 |
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[0d1d489] | 148 | <indexterm zone="tcpwrappers tcpwrappers-config">
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| 149 | <primary sortas="e-etc-xinetd.conf">/etc/xinetd.conf</primary>
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| 150 | </indexterm>
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[59048cd9] | 151 | -->
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[0d1d489] | 152 | </sect3>
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[bab92281] | 153 |
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[0d1d489] | 154 | </sect2>
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[bab92281] | 155 |
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[0d1d489] | 156 | <sect2 role="content">
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| 157 | <title>Contents</title>
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| 158 |
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| 159 | <segmentedlist>
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| 160 | <segtitle>Installed Programs</segtitle>
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| 161 | <segtitle>Installed Library</segtitle>
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| 162 | <segtitle>Installed Directories</segtitle>
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[bab92281] | 163 |
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[0d1d489] | 164 | <seglistitem>
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| 165 | <seg>tcpd, tcpdchk, tcpdmatch, try-from, and safe_finger</seg>
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[061ec9d] | 166 | <seg>libwrap.{so,a}</seg>
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[0d1d489] | 167 | <seg>None</seg>
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| 168 | </seglistitem>
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| 169 | </segmentedlist>
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[bab92281] | 170 |
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[0d1d489] | 171 | <variablelist>
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| 172 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 173 | <?dbfo list-presentation="list"?>
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| 174 | <?dbhtml list-presentation="table"?>
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[bab92281] | 175 |
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[0d1d489] | 176 | <varlistentry id="tcpd">
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| 177 | <term><command>tcpd</command></term>
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| 178 | <listitem>
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[17e6d48] | 179 | <para>is the main access control daemon for all Internet services,
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[0d1d489] | 180 | which <command>inetd</command> or <command>xinetd</command>
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| 181 | will run instead of running the requested service daemon.</para>
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| 182 | <indexterm zone="tcpwrappers tcpd">
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| 183 | <primary sortas="b-tcpd">tcpd</primary>
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| 184 | </indexterm>
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| 185 | </listitem>
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| 186 | </varlistentry>
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[bab92281] | 187 |
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[0d1d489] | 188 | <varlistentry id="tcpdchk">
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| 189 | <term><command>tcpdchk</command></term>
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| 190 | <listitem>
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[17e6d48] | 191 | <para>is a tool to examine a <command>tcpd</command> wrapper
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[0d1d489] | 192 | configuration and report problems with it.</para>
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| 193 | <indexterm zone="tcpwrappers tcpdchk">
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| 194 | <primary sortas="b-tcpdchk">tcpdchk</primary>
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| 195 | </indexterm>
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| 196 | </listitem>
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| 197 | </varlistentry>
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[bab92281] | 198 |
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[0d1d489] | 199 | <varlistentry id="tcpdmatch">
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| 200 | <term><command>tcpdmatch</command></term>
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| 201 | <listitem>
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[17e6d48] | 202 | <para>is used to predict how the TCP wrapper
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[0d1d489] | 203 | would handle a specific request for a service.</para>
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| 204 | <indexterm zone="tcpwrappers tcpdmatch">
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| 205 | <primary sortas="b-tcpdmatch">tcpdmatch</primary>
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| 206 | </indexterm>
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| 207 | </listitem>
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| 208 | </varlistentry>
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[bab92281] | 209 |
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[0d1d489] | 210 | <varlistentry id="try-from">
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| 211 | <term><command>try-from</command></term>
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| 212 | <listitem>
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[17e6d48] | 213 | <para>can be called via a remote shell command to find out if the
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[0d1d489] | 214 | host name and address are properly recognized.</para>
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| 215 | <indexterm zone="tcpwrappers try-from">
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| 216 | <primary sortas="b-try-from">try-from</primary>
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| 217 | </indexterm>
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| 218 | </listitem>
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| 219 | </varlistentry>
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[bab92281] | 220 |
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[0d1d489] | 221 | <varlistentry id="safe_finger">
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| 222 | <term><command>safe_finger</command></term>
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| 223 | <listitem>
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[17e6d48] | 224 | <para>is a wrapper for the <command>finger</command> utility, to
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[0d1d489] | 225 | provide automatic reverse name lookups.</para>
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| 226 | <indexterm zone="tcpwrappers safe_finger">
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| 227 | <primary sortas="b-safe_finger">safe_finger</primary>
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| 228 | </indexterm>
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| 229 | </listitem>
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| 230 | </varlistentry>
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[bab92281] | 231 |
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[0d1d489] | 232 | <varlistentry id="libwrap">
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[061ec9d] | 233 | <term><filename class='libraryfile'>libwrap.{so,a}</filename></term>
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[0d1d489] | 234 | <listitem>
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[17e6d48] | 235 | <para>contains the API functions required by
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[17d22d99] | 236 | the <application>TCP Wrapper</application> programs as well as other programs
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| 237 | to become <quote><application>TCP Wrapper</application>-aware</quote>.</para>
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[0d1d489] | 238 | <indexterm zone="tcpwrappers libwrap">
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[061ec9d] | 239 | <primary sortas="c-libwrap">libwrap.{so,a}</primary>
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[0d1d489] | 240 | </indexterm>
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| 241 | </listitem>
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| 242 | </varlistentry>
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[bab92281] | 243 |
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[0d1d489] | 244 | </variablelist>
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| 245 |
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| 246 | </sect2>
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[0f5698f] | 247 |
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| 248 | </sect1>
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