source: postlfs/security/tripwire.xml@ dd362e5

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
   "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY tripwire-download-http "http://www.frenchfries.net/paul/tripwire/tripwire-&tripwire-version;.tar.gz">
  <!ENTITY tripwire-download-ftp  " ">
  <!ENTITY tripwire-size          "869 KB">
  <!ENTITY tripwire-buildsize     "22 MB">
  <!ENTITY tripwire-time          "2.96 SBU">
]>

<sect1 id="tripwire-portable" xreflabel="Tripwire-&tripwire-version;">
<sect1info>
<othername>$LastChangedBy$</othername>
<date>$Date$</date>
</sect1info>
<?dbhtml filename="tripwire.html"?>
<title>Tripwire-&tripwire-version;</title>

<sect2>
<title>Introduction to <application>Tripwire</application></title>

<para>The <application>Tripwire</application> package contains programs used 
to verify the integrity of the files on a given system.</para>

<sect3><title>Package information</title>
<itemizedlist spacing='compact'>
<listitem><para>Download (HTTP): <ulink
url="&tripwire-download-http;"/></para></listitem>
<listitem><para>Download (FTP): <ulink
url="&tripwire-download-ftp;"/></para></listitem>
<listitem><para>Download size: &tripwire-size;</para></listitem>
<listitem><para>Estimated disk space required:
&tripwire-buildsize;</para></listitem>
<listitem><para>Estimated build time:
&tripwire-time;</para></listitem></itemizedlist>
</sect3>

<sect3><title><application>Tripwire</application> dependencies</title>
<sect4><title>Optional</title>
<para><acronym>MTA</acronym> (See <xref linkend="server-mail"/>)</para></sect4>
</sect3>

</sect2>

<sect2>
<title>Installation of <application>Tripwire</application></title>

<para>Compile <application>Tripwire</application> by running the following 
commands:</para>

<screen><userinput><command>sed -i -e 's@TWDB="${prefix}@TWDB="/var/lib@' install/install.cfg &amp;&amp;
./configure --prefix=/usr --sysconfdir=/etc/tripwire &amp;&amp;
make &amp;&amp;
make install &amp;&amp;
cp policy/*.txt /usr/share/doc/tripwire</command></userinput></screen>

<para>The default configuration is to use a local <acronym>MTA</acronym>. If 
you don't have an <acronym>MTA</acronym> installed and have no wish to install 
one, modify <filename>install.cfg</filename> to use an <acronym>SMTP</acronym> 
server instead.</para>

</sect2>

<sect2>
<title>Command explanations</title>

<para><command>sed -i -e 's@TWDB="${prefix}@TWDB="/var/lib@' 
install/install.cfg</command>: This command tells the package to install the 
program database and reports in
<filename>/var/lib/tripwire</filename>.</para>

<para><command>make install</command>: This command creates the
<application>Tripwire</application> security keys as well as installing the
binaries. There are two keys: a site key and a local key which are stored in
<filename class="directory">/etc/tripwire/</filename>.</para>

<para><command>cp policy/*.txt /usr/share/doc/tripwire</command>: This command 
installs the documentation.</para>

</sect2>

<sect2>
<title>Configuring <application>Tripwire</application></title>

<sect3><title>Config files</title>
<para><filename>/etc/tripwire/*</filename></para>
</sect3>

<sect3><title>Configuration Information</title>

<para><application>Tripwire</application> uses a policy file to determine which 
files are integrity checked. The default policy file 
(<filename>/etc/tripwire/twpol.txt</filename>) is for a default 
installation Redhat and will need to be updated for your system.</para>

<para>Policy files should be tailored to each individual distribution and/or
installation. Some custom policy files can be found below: </para>

<screen><ulink url="http://home.iprimus.com.au/glombowski/blfs/twpol-all.txt"/>
Checks integrity of all files
<ulink url="http://home.iprimus.com.au/glombowski/blfs/twpol-lfs.txt"/>
Custom policy file for Base LFS 3.0 system
<ulink url="http://home.iprimus.com.au/glombowski/blfs/twpol-suse7.2.txt"/>
Custom policy file for SuSE 7.2 system</screen>

<para>Download the custom policy file you'd like to try, copy it into
<filename class="directory">/etc/tripwire/</filename>, and use it instead of 
<filename>twpol.txt</filename>. It is, however, recommended that you make 
your own policy file. Get ideas from the examples above and read 
<filename>/usr/share/doc/tripwire/policyguide.txt</filename> for additional
information. <filename>twpol.txt</filename> is a good policy file for beginners 
as it will note any changes to the file system and can even be used as an 
annoying way of keeping track of changes for uninstallation of software.</para>

<para>After your policy file has been transferred to 
<filename class="directory">/etc/tripwire/</filename> you may begin the 
configuration steps:</para>

<screen><userinput><command>twadmin --create-polfile --site-keyfile=/etc/tripwire site.key \
    /etc/tripwire/twpol.txt &amp;&amp;
tripwire --init</command></userinput></screen>

</sect3>

<sect3><title>Usage Information</title>
<para>To use <application>Tripwire</application> after creating a policy file 
to run a report, use the following command:</para>

<screen><userinput><command>tripwire --check &gt; /etc/tripwire/report.txt</command></userinput></screen>

<para>View the output to check the integrity of your files. An automatic
integrity report can be produced by using a cron facility to schedule
the runs.</para>

<para>Please note that after you run an integrity check, you must examine
the report (or email) and then modify the <application>Tripwire</application> 
database to reflect the changed files on your system. This is so that 
<application>Tripwire</application> will not continually notify you that
files you intentionally changed are a security violation. To do this you
must first <command>ls -l /var/lib/tripwire/report/</command> and note
the name of the newest file which starts with <filename>linux-</filename> and 
ends in <filename>.twr</filename>. This encrypted file was created during the 
last report creation and is needed to update the
<application>Tripwire</application> database of your 
system. Then, type in the following command making the appropriate 
substitutions for <replaceable>[?]</replaceable>:</para>

<screen><userinput><command>tripwire --update -twrfile \
    /var/lib/tripwire/report/linux-<replaceable>[???????]</replaceable>-<replaceable>[??????]</replaceable>.twr</command></userinput></screen>

<para>You will be placed into <application>vim</application> with a copy of 
the report in front of you. If all the changes were good, then just type 
<command>:x</command> and after entering your local key, the database will be 
updated. If there are files which you still want to be warned about, remove the 
'x' before the filename in the report and type <command>:x</command>.</para>

</sect3>

<sect3><title>Changing the Policy File</title>

<para>If you are unhappy with your policy file and would like to modify it or 
use a new one, modify the policy file and then execute the following
commands:</para>

<screen><userinput><command>twadmin --create-polfile /etc/tripwire/twpol.txt &amp;&amp;
tripwire --init</command></userinput></screen>

</sect3>

</sect2>

<sect2>
<title>Contents</title>
<segmentedlist>
  <segtitle>Installed Programs</segtitle>
  <seglistitem>
    <seg>siggen, tripwire, twadmin and twprint.</seg>
  </seglistitem>
</segmentedlist>

<variablelist>
  <bridgehead renderas="sect3">Short Descriptions</bridgehead>
  <?dbfo list-presentation="list"?>

  <varlistentry id="siggen"> 
    <term><command>siggen</command></term>
    <listitem><para>is a signature gathering utility that displays 
      the hash function values for the specified files.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='tripwire'>
    <term><command>tripwire</command></term> 
    <listitem><para>is the main file integrity checking program.</para></listitem>
  </varlistentry>

  <varlistentry id='twadmin'>
    <term><command>twadmin</command></term>
    <listitem><para>administrative and utility tool used to perform 
      certain administrative functions related to 
      <application>Tripwire</application> files and configuration options.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='twprint'>
    <term><command>twprint</command></term>
    <listitem><para>prints <application>Tripwire</application> 
      database and report files in clear text format.</para>
    </listitem>
  </varlistentry>
</variablelist>

</sect2>

</sect1>