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 This capability is obsolete in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