1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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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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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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8 | <!ENTITY tcpwrappers-download-ftp "ftp://ftp.porcupine.org/pub/security/tcp_wrappers_&tcpwrappers-version;.tar.gz">
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9 | <!ENTITY tcpwrappers-md5 "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 "0.03 SBU">
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13 | ]>
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14 |
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15 | <sect1 id="tcpwrappers" xreflabel="tcpwrappers-&tcpwrappers-version;">
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16 | <sect1info>
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17 | <othername>$LastChangedBy$</othername>
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18 | <date>$Date$</date>
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19 | </sect1info>
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20 | <?dbhtml filename="tcpwrappers.html"?>
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21 | <title>tcpwrappers-&tcpwrappers-version;</title>
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22 | <indexterm zone="tcpwrappers">
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23 | <primary sortas="a-Tcpwrappers">Tcpwrappers</primary></indexterm>
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24 |
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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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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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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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38 | <listitem><para>Download MD5 Sum: &tcpwrappers-md5;</para></listitem>
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39 | <listitem><para>Download size: &tcpwrappers-size;</para></listitem>
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40 | <listitem><para>Estimated disk space required:
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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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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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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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63 | <screen><userinput><command>patch -Np1 -i ../tcp_wrappers-&tcpwrappers-version;-shared_lib_plus_plus-1.patch &&
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64 | sed -i -e "s,^extern char \*malloc();,/* & */," scaffold.c &&
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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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70 |
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71 | </sect2>
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72 |
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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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82 | <sect2>
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83 | <title>Configuring <application>tcpwrappers</application></title>
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84 |
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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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87 | <filename>/etc/hosts.deny</filename></para>
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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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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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98 | <para>As the root user, perform the following edits on the
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99 | <filename>/etc/inetd.conf</filename> configuration file:</para>
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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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103 | <screen><userinput role='root'>finger stream tcp nowait nobody /usr/sbin/in.fingerd in.fingerd</userinput></screen>
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104 | <para>becomes:</para>
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105 | <screen><userinput role='root'>finger stream tcp nowait nobody /usr/sbin/tcpd in.fingerd</userinput></screen>
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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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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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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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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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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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194 |
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195 | </sect2>
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196 |
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197 | </sect1>
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198 |
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