cracklib2 is a library containing a C function which may be
used in a passwd
like program. The idea is simple: try to prevent users from choosing
passwords that could be guessed by crack by filtering them
source. cracklib2 is not a replacement passwd
program. cracklib2 is a library.
cracklib2-dev contains the header files, static libraries,
documentation, and symbolic links developers using cracklib2
In Debian the binary packages login and passwd
(both part of the source package shadow) and pam have
some support for cracklib2. I've successfully built the shadow source package
with cracklib2 support.
To use cracklib2 with the shadow package, you'll
need to download the source package and rebuild the package on your
machine. You'll obviously need the development environment.
Fortunately, no changes in the source code or Debian modifications need
to be made since the autoconf
programs will automatically detect that cracklib2 is
installed. The only requirement is that cracklib2 must be
installed prior to rebuilding shadow.
After installing the rebuilt resulting binary packages, you'll need to
modify the file /etc/login.defs.
Set the entry for CRACKLIB_DICTPATH to the location of the
cracklib2 dictionary database. This would normally be
Next, you'll need to define what word list should be used to construct
the /var/cache/cracklib/cracklib_dict database. Do this by adding
additional entries in /etc/cracklib/cracklib.conf.