1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.3/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 "1.04 MB">
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12 | <!ENTITY tcpwrappers-time "0.02 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 |
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23 | <sect2>
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24 | <title>Introduction to <application>tcpwrappers</application></title>
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25 |
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26 | <para>The <application>tcpwrappers</application> package provides daemon
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27 | wrapper programs that report the name of the client requesting network
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28 | services and the requested service.</para>
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29 |
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30 | <sect3><title>Package information</title>
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31 | <itemizedlist spacing='compact'>
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32 | <listitem><para>Download (HTTP): <ulink
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33 | url="&tcpwrappers-download-http;"/></para></listitem>
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34 | <listitem><para>Download (FTP): <ulink
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35 | url="&tcpwrappers-download-ftp;"/></para></listitem>
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36 | <listitem><para>Download MD5 Sum: &tcpwrappers-md5;</para></listitem>
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37 | <listitem><para>Download size: &tcpwrappers-size;</para></listitem>
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38 | <listitem><para>Estimated Disk space required:
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39 | &tcpwrappers-buildsize;</para></listitem>
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40 | <listitem><para>Estimated build time:
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41 | &tcpwrappers-time;</para></listitem></itemizedlist>
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42 | </sect3>
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43 |
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44 | <sect3><title>Additional downloads</title>
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45 | <itemizedlist spacing='compact'>
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46 | <listitem><para>Required Patch (Fixes some build issues and adds building of a shared library):
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47 | <ulink url="&patch-root;/tcp_wrappers-&tcpwrappers-version;-shared_lib_plus_plus-1.patch"/></para>
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48 | </listitem>
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49 | <listitem><para>Required Patch (If compiled using <application>GCC</application>-3.4.x):
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50 | <ulink url="&patch-root;/tcp_wrappers-&tcpwrappers-version;-gcc34-1.patch"/></para>
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51 | </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 | patch -Np1 -i ../tcp_wrappers-&tcpwrappers-version;-gcc34-1.patch &&
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65 | make REAL_DAEMON_DIR=/usr/sbin STYLE=-DPROCESS_OPTIONS linux &&
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66 | make install</command></userinput></screen>
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67 |
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68 | </sect2>
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69 |
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70 | <sect2>
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71 | <title>Configuring <application>tcpwrappers</application></title>
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72 |
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73 | <sect3><title>Config files</title>
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74 | <para><filename>/etc/hosts.allow</filename>,
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75 | <filename>/etc/hosts.deny</filename></para>
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76 |
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77 | <para>File protections: the wrapper, all files used by the wrapper,
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78 | and all directories in the path leading to those files, should be
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79 | accessible but not writable for unprivileged users (mode 755 or mode
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80 | 555). Do not install the wrapper set-uid.</para>
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81 |
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82 | <para>Then perform the following edits on the
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83 | <filename>/etc/inetd.conf</filename> configuration file:</para>
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84 | <screen><userinput>finger stream tcp nowait nobody /usr/sbin/in.fingerd in.fingerd</userinput></screen>
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85 | <para>becomes:</para>
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86 | <screen><userinput>finger stream tcp nowait nobody /usr/sbin/tcpd in.fingerd</userinput></screen>
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87 |
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88 | <note><para>The finger server is used as an example here.</para></note>
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89 |
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90 | <para>Similar changes must be made if <application>xinetd</application> is
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91 | used, with the emphasis being on calling <command>/usr/sbin/tcpd</command>
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92 | instead of calling the service daemon directly, and passing the name of the
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93 | service daemon to <command>tcpd</command>.</para>
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94 | </sect3>
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95 |
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96 | </sect2>
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97 |
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98 | <sect2>
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99 | <title>Contents</title>
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100 |
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101 | <para>The <application>tcpwrappers</application> package contains <command>
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102 | tcpd</command>, <command>tcpdchk</command>, <command>tcpdmatch</command>,
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103 | <command>try-from</command>, <command>safe_finger</command> and the
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104 | <filename class='libraryfile'>libwrap</filename> libraries.</para>
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105 | </sect2>
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106 |
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107 | <sect2><title>Description</title>
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108 |
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109 | <sect3><title>tcpd</title>
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110 | <para><command>tcpd</command> is the main access control daemon for all
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111 | Internet services, which <command>inetd</command> or
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112 | <command>xinetd</command> will run instead of running the
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113 | requested service daemon.</para></sect3>
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114 |
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115 | <sect3><title>tcpdchk</title>
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116 | <para><command>tcpdchk</command> is a tool to examine a <command>tcpd</command>
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117 | wrapper configuration and report problems with it.</para></sect3>
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118 |
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119 | <sect3><title>tcpdmatch</title>
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120 | <para><command>tcpdmatch</command> is used to predict how the tcp wrapper
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121 | would handle a specific request for a service.</para></sect3>
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122 |
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123 | <sect3><title>try-from</title>
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124 | <para><command>try-from</command> can be called via a remote shell command to
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125 | find out if the host name and address are properly recognized.</para></sect3>
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126 |
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127 | <sect3><title>safe_finger</title>
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128 | <para><command>safe_finger</command> is a wrapper for the
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129 | <command>finger</command> utility, to provide automatic reverse name
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130 | lookups.</para></sect3>
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131 |
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132 | </sect2>
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133 |
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134 | </sect1>
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135 |
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