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