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 This capability is obsolete in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