source: postlfs/security/cracklib.xml@ b4b71892

<?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 cracklib-download-http "http://www.crypticide.com/users/alecm/security/cracklib,&cracklib-version;.tar.gz">
  <!ENTITY cracklib-download-ftp "ftp://ftp.cerias.purdue.edu/pub/tools/unix/libs/cracklib/cracklib.&cracklib-version;.tar.gz">
  <!ENTITY cracklib-size      "21 KB">
  <!ENTITY cracklib-buildsize "17 MB">
  <!ENTITY cracklib-time      "0.10 SBU">
  <!ENTITY crackdict-size     "15.6MB">
  <!ENTITY alldict-size       "466KB">
]>

<sect1 id="cracklib" xreflabel="cracklib-&cracklib-version;">
<?dbhtml filename="cracklib.html"?>
<title>cracklib-&cracklib-version;</title>


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

<para>The cracklib package contains a library used to enforce strong passwords
by comparing user selected passwords to words in a chosen wordlist.</para>

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

<sect3><title>Additional downloads</title>
<itemizedlist spacing='compact'>
<listitem><para>Required patch: <ulink
url="&patch-root;/cracklib,&cracklib-version;-blfs-1.patch"/></para></listitem>
<listitem><para>Recommended patch: <ulink
url="&patch-root;/cracklib,&cracklib-version;-heimdal-1.patch"/></para></listitem>
</itemizedlist>

<para>You will also need to download a wordlist for use with cracklib.  There
are two wordlists to choose from at the following location.  Use the
<filename>cracklib</filename> word list for good security, or opt for the
<filename>allwords</filename> word list for lightweight machines short on
<acronym>RAM</acronym>.  You can of course choose any other word list that you
have at your disposal.</para>

<para>cracklib (&crackdict-size;): <ulink url="http://www.cotse.com/wordlists/cracklib"/></para>
<para>allwords (&alldict-size;): <ulink url="http://www.cotse.com/wordlists/allwords"/></para>

</sect3>

</sect2>

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

<para>First, we need to install the chosen word list for cracklib:</para>

<screen><userinput><command>install -d -m755 /usr/share/dict &amp;&amp;
install -m644 <replaceable>[wordlist]</replaceable> /usr/share/dict &amp;&amp;
ln -sf <replaceable>[wordlist]</replaceable> /usr/share/dict/words &amp;&amp;
echo $(hostname) >> /usr/share/dict/extra.words</command></userinput></screen>

<para>Our wordlist is linked to <filename>/usr/share/dict/words</filename> as
historically, <filename>words</filename> is the primary wordlist in the
<filename class="directory">/usr/share/dict</filename> directory.  We also echo
the value of hostname to a file called extra.words.  This extra file is intened
to be a site specific list which includes easy to guess passwords such as
company or department name, user's names, product names, computer name, domain
name, etc.</para>

<para>Now apply BLFS patch:</para>

<screen><userinput><command>patch -Np1 -i ../cracklib,&cracklib-version;-blfs-1.patch</command></userinput></screen>

<para>If necessary, apply the heimdal patch:</para>

<screen><userinput><command>cp -R cracklib cracklib_krb5 &amp;&amp;
patch -Np1 -i ../cracklib,&cracklib-version;-heimdal-1.patch</command></userinput></screen>

<para>Finally install the package:</para>
<screen><userinput><command>make install</command></userinput></screen>

</sect2>

<sect2>
<title>Contents</title>

<para>The <application>cracklib</application> package 
contains the <filename class="libraryfile">libcrack</filename> 
library.</para>

</sect2>

<sect2><title>Description</title>

<sect3><title>libcrack library</title>
<para>The <filename class="libraryfile">libcrack</filename> library
provides a fast dictionary lookup method for strong password
enforcement.</para></sect3>

</sect2>

</sect1>