[d47e7ea9] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[ff769b8c] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.4/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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| 7 | <!ENTITY tcpwrappers-download-http "http://files.ichilton.co.uk/nfs/tcp_wrappers_&tcpwrappers-version;.tar.gz">
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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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[621e95c] | 9 | <!ENTITY tcpwrappers-md5 "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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| 12 | <!ENTITY tcpwrappers-time "0.03 SBU">
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[d47e7ea9] | 13 | ]>
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| 14 |
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[0f5698f] | 15 | <sect1 id="tcpwrappers" xreflabel="tcpwrappers-&tcpwrappers-version;">
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[a0f03b0] | 16 | <sect1info>
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[5cd0959d] | 17 | <othername>$LastChangedBy$</othername>
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| 18 | <date>$Date$</date>
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[a0f03b0] | 19 | </sect1info>
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[00bb024c] | 20 | <?dbhtml filename="tcpwrappers.html"?>
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[0f5698f] | 21 | <title>tcpwrappers-&tcpwrappers-version;</title>
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[c18c49fe] | 22 | <indexterm zone="tcpwrappers">
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| 23 | <primary sortas="a-Tcpwrappers">Tcpwrappers</primary></indexterm>
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[0f5698f] | 24 |
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[d47e7ea9] | 25 | <sect2>
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| 26 | <title>Introduction to <application>tcpwrappers</application></title>
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| 27 |
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| 28 | <para>The <application>tcpwrappers</application> package provides daemon
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[b1623c2] | 29 | wrapper programs that report the name of the client requesting network
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| 30 | services and the requested service.</para>
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[d47e7ea9] | 31 |
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| 32 | <sect3><title>Package information</title>
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| 33 | <itemizedlist spacing='compact'>
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| 34 | <listitem><para>Download (HTTP): <ulink
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| 35 | url="&tcpwrappers-download-http;"/></para></listitem>
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| 36 | <listitem><para>Download (FTP): <ulink
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| 37 | url="&tcpwrappers-download-ftp;"/></para></listitem>
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[dc2f5ad] | 38 | <listitem><para>Download MD5 Sum: &tcpwrappers-md5;</para></listitem>
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[d47e7ea9] | 39 | <listitem><para>Download size: &tcpwrappers-size;</para></listitem>
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[518538f] | 40 | <listitem><para>Estimated disk space required:
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[d47e7ea9] | 41 | &tcpwrappers-buildsize;</para></listitem>
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| 42 | <listitem><para>Estimated build time:
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| 43 | &tcpwrappers-time;</para></listitem></itemizedlist>
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| 44 | </sect3>
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| 45 |
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| 46 | <sect3><title>Additional downloads</title>
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| 47 | <itemizedlist spacing='compact'>
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[09c3df0] | 48 | <listitem><para>Required Patch (Fixes some build issues and adds building of a
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| 49 | shared library): <ulink
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| 50 | url="&patch-root;/tcp_wrappers-&tcpwrappers-version;-shared_lib_plus_plus-1.patch"/>
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| 51 | </para></listitem>
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[d47e7ea9] | 52 | </itemizedlist>
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| 53 | </sect3>
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| 54 |
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| 55 | </sect2>
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| 56 |
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| 57 | <sect2>
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| 58 | <title>Installation of <application>tcpwrappers</application></title>
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| 59 |
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| 60 | <para>Install <application>tcpwrappers</application> with the following
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| 61 | commands:</para>
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| 62 |
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[4f6275fd] | 63 | <screen><userinput><command>patch -Np1 -i ../tcp_wrappers-&tcpwrappers-version;-shared_lib_plus_plus-1.patch &&
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[0e92f49] | 64 | sed -i -e "s,^extern char \*malloc();,/* & */," scaffold.c &&
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[c53fc5f6] | 65 | make REAL_DAEMON_DIR=/usr/sbin STYLE=-DPROCESS_OPTIONS linux</command></userinput></screen>
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| 66 |
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| 67 | <para>Now, as the root user:</para>
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| 68 |
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| 69 | <screen><userinput role='root'><command>make install</command></userinput></screen>
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[d47e7ea9] | 70 |
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| 71 | </sect2>
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| 72 |
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[09c3df0] | 73 | <sect2>
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| 74 | <title>Command explanations</title>
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| 75 |
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| 76 | <para><command>sed -i -e ... scaffold.c</command>: This command removes an
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| 77 | obsolete C declaration which causes the build to fail if using
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| 78 | <application><acronym>GCC</acronym>-3.4.x</application>.</para>
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| 79 |
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| 80 | </sect2>
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| 81 |
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[d47e7ea9] | 82 | <sect2>
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| 83 | <title>Configuring <application>tcpwrappers</application></title>
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| 84 |
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[c18c49fe] | 85 | <sect3 id="tcpwrappers-config"><title>Config files</title>
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| 86 | <para><filename>/etc/hosts.allow</filename> and
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[d47e7ea9] | 87 | <filename>/etc/hosts.deny</filename></para>
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[c18c49fe] | 88 | <indexterm zone="tcpwrappers tcpwrappers-config">
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| 89 | <primary sortas="e-etc-hosts.allow">/etc/hosts.allow</primary></indexterm>
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| 90 | <indexterm zone="tcpwrappers tcpwrappers-config">
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| 91 | <primary sortas="e-etc-hosts.deny">/etc/hosts.deny</primary></indexterm>
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[d47e7ea9] | 92 |
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| 93 | <para>File protections: the wrapper, all files used by the wrapper,
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| 94 | and all directories in the path leading to those files, should be
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| 95 | accessible but not writable for unprivileged users (mode 755 or mode
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| 96 | 555). Do not install the wrapper set-uid.</para>
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| 97 |
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[c53fc5f6] | 98 | <para>As the root user, perform the following edits on the
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[d47e7ea9] | 99 | <filename>/etc/inetd.conf</filename> configuration file:</para>
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[c18c49fe] | 100 | <indexterm zone="tcpwrappers tcpwrappers-config">
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| 101 | <primary sortas="e-etc-inetd.conf">/etc/inetd.conf</primary></indexterm>
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| 102 |
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[c53fc5f6] | 103 | <screen><userinput role='root'>finger stream tcp nowait nobody /usr/sbin/in.fingerd in.fingerd</userinput></screen>
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[d47e7ea9] | 104 | <para>becomes:</para>
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[c53fc5f6] | 105 | <screen><userinput role='root'>finger stream tcp nowait nobody /usr/sbin/tcpd in.fingerd</userinput></screen>
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[d47e7ea9] | 106 |
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| 107 | <note><para>The finger server is used as an example here.</para></note>
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| 108 |
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[b600019] | 109 | <para>Similar changes must be made if <application>xinetd</application> is
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| 110 | used, with the emphasis being on calling <command>/usr/sbin/tcpd</command>
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| 111 | instead of calling the service daemon directly, and passing the name of the
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| 112 | service daemon to <command>tcpd</command>.</para>
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[c18c49fe] | 113 | <indexterm zone="tcpwrappers tcpwrappers-config">
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| 114 | <primary sortas="e-etc-xinetd.conf">/etc/xinetd.conf</primary></indexterm>
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[d47e7ea9] | 115 | </sect3>
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| 116 |
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| 117 | </sect2>
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| 118 |
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| 119 | <sect2>
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| 120 | <title>Contents</title>
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| 121 |
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[c18c49fe] | 122 | <segmentedlist>
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| 123 | <segtitle>Installed Programs</segtitle>
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| 124 | <segtitle>Installed Library</segtitle>
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| 125 | <segtitle>Installed Directories</segtitle>
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| 126 |
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| 127 | <seglistitem>
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| 128 | <seg>tcpd, tcpdchk, tcpdmatch, try-from and safe_finger</seg>
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| 129 | <seg>libwrap.[so,a]</seg>
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| 130 | <seg>None</seg>
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| 131 | </seglistitem>
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| 132 | </segmentedlist>
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| 133 |
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| 134 | <variablelist>
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| 135 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 136 | <?dbfo list-presentation="list"?>
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| 137 |
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| 138 | <varlistentry id="tcpd">
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| 139 | <term><command>tcpd</command></term>
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| 140 | <listitem><para>is the main access control daemon for all Internet services,
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| 141 | which <command>inetd</command> or <command>xinetd</command> will run instead
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| 142 | of running the requested service daemon.</para>
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| 143 | <indexterm zone="tcpwrappers tcpd">
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| 144 | <primary sortas="b-tcpd">tcpd</primary>
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| 145 | </indexterm></listitem>
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| 146 | </varlistentry>
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| 147 |
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| 148 | <varlistentry id="tcpdchk">
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| 149 | <term><command>tcpdchk</command></term>
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| 150 | <listitem><para>is a tool to examine a <command>tcpd</command> wrapper
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| 151 | configuration and report problems with it.</para>
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| 152 | <indexterm zone="tcpwrappers tcpdchk">
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| 153 | <primary sortas="b-tcpdchk">tcpdchk</primary>
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| 154 | </indexterm></listitem>
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| 155 | </varlistentry>
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| 156 |
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| 157 | <varlistentry id="tcpdmatch">
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| 158 | <term><command>tcpdmatch</command></term>
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| 159 | <listitem><para>is used to predict how the <acronym>TCP</acronym> wrapper
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| 160 | would handle a specific request for a service.</para>
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| 161 | <indexterm zone="tcpwrappers tcpdmatch">
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| 162 | <primary sortas="b-tcpdmatch">tcpdmatch</primary>
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| 163 | </indexterm></listitem>
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| 164 | </varlistentry>
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| 165 |
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| 166 | <varlistentry id="try-from">
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| 167 | <term><command>try-from</command></term>
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| 168 | <listitem><para>can be called via a remote shell command to find out if the
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| 169 | host name and address are properly recognized.</para>
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| 170 | <indexterm zone="tcpwrappers try-from">
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| 171 | <primary sortas="b-try-from">try-from</primary>
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| 172 | </indexterm></listitem>
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| 173 | </varlistentry>
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| 174 |
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| 175 | <varlistentry id="safe_finger">
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| 176 | <term><command>safe_finger</command></term>
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| 177 | <listitem><para>is a wrapper for the <command>finger</command> utility, to
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| 178 | provide automatic reverse name lookups.</para>
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| 179 | <indexterm zone="tcpwrappers safe_finger">
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| 180 | <primary sortas="b-safe_finger">safe_finger</primary>
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| 181 | </indexterm></listitem>
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| 182 | </varlistentry>
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| 183 |
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| 184 | <varlistentry id="libwrap">
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| 185 | <term><filename class='libraryfile'>libwrap.[so,a]</filename></term>
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| 186 | <listitem><para>contains the <acronym>API</acronym> functions required by
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| 187 | the <application>tcpwrappers</application> programs as well as other programs
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| 188 | to become <quote><application>tcpwrappers</application>-aware</quote>.</para>
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| 189 | <indexterm zone="tcpwrappers libwrap">
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| 190 | <primary sortas="c-libwrap">libwrap.[so,a]</primary>
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| 191 | </indexterm></listitem>
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| 192 | </varlistentry>
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| 193 | </variablelist>
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[d47e7ea9] | 194 |
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| 195 | </sect2>
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[0f5698f] | 196 |
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| 197 | </sect1>
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| 198 |
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