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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>cracklib2 - a pro-active password library</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"></HEAD
><BODY
CLASS="article"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="ARTICLE"
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
><A
NAME="AEN1"
>cracklib2 - a pro-active password library</A
></H1
><H3
CLASS="author"
><A
NAME="AEN51"
>Jean Pierre LeJacq</A
></H3
><H3
CLASS="author"
><A
NAME="AEN56"
>Martin Pitt</A
></H3
><H3
CLASS="author"
><A
NAME="AEN61"
>Jan Dittberner</A
></H3
><P
CLASS="copyright"
>Copyright &copy; 1998, 1999 Jean Pierre LeJacq</P
><P
CLASS="copyright"
>Copyright &copy; 2003 Martin Pitt</P
><P
CLASS="copyright"
>Copyright &copy; 2008 Jan Dittberner</P
><P
CLASS="pubdate"
>$Date$<BR></P
><DIV
><DIV
CLASS="abstract"
><P
></P
><A
NAME="AEN4"
></A
><P
><SPAN
CLASS="application"
>cracklib2</SPAN
> is a library
      containing a C function which may be used in a <A
HREF="/cgi-bin/man/man2html/passwd+1"
TARGET="_top"
>passwd
      (1)</A
> like program. The idea is simple: try to prevent
      users from choosing passwords that could be guessed by <A
HREF="http://www.crypticide.com/alecm/security/c50-faq.html"
TARGET="_top"
><SPAN
CLASS="application"
><TT
CLASS="filename"
>crack</TT
></SPAN
></A
>
      by filtering them out, at
      source. <SPAN
CLASS="application"
>cracklib2</SPAN
> is
      <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>not</I
></SPAN
> a replacement <A
HREF="/cgi-bin/man/man2html/passwd+1"
TARGET="_top"
>passwd
      (1)</A
> program. <SPAN
CLASS="application"
>cracklib2</SPAN
> is a
      <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>library</I
></SPAN
>.</P
><P
><SPAN
CLASS="application"
>cracklib2</SPAN
> is an offshoot of
      version 5 of the <A
HREF="http://www.crypticide.org/users/alecm/security/c50-faq.html"
TARGET="_top"
><SPAN
CLASS="application"
><TT
CLASS="filename"
>crack</TT
></SPAN
></A
>
      software and contains a considerable number of ideas nicked from
      the new software.</P
><P
><SPAN
CLASS="application"
>cracklib2</SPAN
>'s <A
HREF="http://www.crypticide.org/dropsafe/about"
TARGET="_top"
>original home
      page</A
> provides some links on security publications and
      access to source code written by the author of
      <SPAN
CLASS="application"
>cracklib2</SPAN
>.  While there is a <A
HREF="README"
TARGET="_top"
>README</A
> there is not much documentation
      available on <SPAN
CLASS="application"
>cracklib2</SPAN
>.  Hopefully
      this page that I generated for the <A
HREF="http://www.debian.org"
TARGET="_top"
>Debian/GNU Linux</A
>
      distribution will improve this situation.</P
><P
><SPAN
CLASS="application"
>cracklib2</SPAN
> has been forked by
      <FONT
COLOR="RED"
><SPAN
CLASS="firstname"
>Nathan</SPAN
><SPAN
CLASS="surname"
>Neulinger</SPAN
></FONT
>
      who is now coordinating the further development. This fork has
      been blessed by the original maintainer in <A
HREF="http://www.crypticide.com/dropsafe/article/1019"
TARGET="_top"
>this
      article</A
>. The new upstream branch is hosted at the <A
HREF="http://sourceforge.net/projects/cracklib"
TARGET="_top"
><SPAN
CLASS="application"
>cracklib2</SPAN
>
      <SPAN
CLASS="trademark"
>SourceForge</SPAN
>&#8482; project page</A
>.</P
><P
></P
></DIV
></DIV
><HR></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>1. <A
HREF="#AEN67"
>Why <SPAN
CLASS="application"
>cracklib2</SPAN
>?</A
></DT
><DT
>2. <A
HREF="#AEN72"
>Who is responsible for all of this?</A
></DT
><DT
>3. <A
HREF="#AEN93"
>How to use <SPAN
CLASS="application"
>cracklib2</SPAN
> with
    Debian</A
></DT
><DT
>4. <A
HREF="#AEN111"
>Debian <SPAN
CLASS="application"
>cracklib2</SPAN
> package overview</A
></DT
></DL
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="AEN67"
>1. Why <SPAN
CLASS="application"
>cracklib2</SPAN
>?</A
></H2
><P
>One of the most common security weaknesses in computer
    systems is the use of easily guessed
    passwords. <SPAN
CLASS="application"
>cracklib2</SPAN
> tries to prevent
    the selection of weak passwords by checking potential passwords
    against dictionaries of commonly used or easily guessed
    words.</P
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="AEN72"
>2. Who is responsible for all of this?</A
></H2
><P
><A
HREF="mailto:alecm@crypticide.com"
TARGET="_top"
>Alec Muffet</A
>
    is the author of <SPAN
CLASS="application"
>cracklib2</SPAN
>. <A
HREF="mailto:jplejacq@quoininc.com"
TARGET="_top"
>Jean
    Pierre LeJacq</A
>
    initially produced this Debian package, <A
HREF="mailto:mpitt@debian.org"
TARGET="_top"
>Martin Pitt</A
>
    is its current maintainer. <A
HREF="mailto:jandd@debian.org"
TARGET="_top"
>Jan Dittberner</A
>
    packaged the new upstream version of
    <SPAN
CLASS="application"
>cracklib2</SPAN
> and updated the
    documentation.</P
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="AEN93"
>3. How to use <SPAN
CLASS="application"
>cracklib2</SPAN
> with
    Debian</A
></H2
><P
>Ideally, the password quality check should be done when an
    user sets his/her password. The PAM (Pluggable Authentication
    Modules) architecture makes it easy to integrate arbitrary checks
    (like <SPAN
CLASS="application"
>cracklib2</SPAN
>) into programs like
    <SPAN
CLASS="application"
><TT
CLASS="filename"
>passwd</TT
></SPAN
> and
    <SPAN
CLASS="application"
><TT
CLASS="filename"
>ssh</TT
></SPAN
>.</P
><P
>To use <SPAN
CLASS="application"
>cracklib2</SPAN
> in Debian,
    install the package <FONT
COLOR="RED"
>libpam_cracklib</FONT
> and follow
    the instructions to enable <FONT
COLOR="RED"
>libpam_cracklib</FONT
> in
    <TT
CLASS="filename"
>/etc/pam.d/common-password</TT
>.</P
><P
>From now on,<SPAN
CLASS="application"
>cracklib2</SPAN
> checks the
    password quality whenever a password is changed with
    <SPAN
CLASS="application"
><TT
CLASS="filename"
>passwd</TT
></SPAN
> and rejects
    bad ones.</P
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="AEN111"
>4. Debian <SPAN
CLASS="application"
>cracklib2</SPAN
> package overview</A
></H2
><P
>The source package is <FONT
COLOR="RED"
>cracklib2</FONT
> which
    generates the following binary packages:</P
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><FONT
COLOR="RED"
>libcrack2</FONT
></DT
><DD
><P
>Shared library and this
        documentation.</P
></DD
><DT
><FONT
COLOR="RED"
>libcrack2-dev</FONT
></DT
><DD
><P
>Header files, static libraries, and symbolic
        links developers using <SPAN
CLASS="application"
>cracklib2</SPAN
>
        will need. This package also provides an example program that
        shows the usage of <SPAN
CLASS="application"
>cracklib2</SPAN
> in own
        applications.</P
></DD
><DT
><FONT
COLOR="RED"
>cracklib-runtime</FONT
></DT
><DD
><P
>Run-time support programs which use the shared
        library in <FONT
COLOR="RED"
>libcrack2</FONT
> including programs to
        build the password dictionary databases used by the functions
        in the shared library.</P
></DD
><DT
><FONT
COLOR="RED"
>python-cracklib</FONT
></DT
><DD
><P
>This package provides Python bindings for the
        shared library in
        <FONT
COLOR="RED"
>libcrack2</FONT
>.</P
></DD
></DL
></DIV
><P
>This package does not include dictionaries since there are
    already lots of them in Debian (<FONT
COLOR="RED"
>wenglish</FONT
>,
    <FONT
COLOR="RED"
>wngerman</FONT
>, etc.).</P
></DIV
></DIV
></BODY
></HTML
>