NAME¶
cracklib-format, cracklib-packer, cracklib-unpacker - cracklib dictionary
utilities
SYNOPSIS¶
cracklib-format file ...
cracklib-packer cracklib_dictpath
cracklib-unpacker cracklib_dictpath
DESCRIPTION¶
cracklib-format takes a list of text files each containing a list of
words, one per line, It lowercases all words, removes control characters, and
sorts the lists. It outputs the cleaned up list to standard output. The text
files may be optionally compressed with
gzip(1).
If you supply massive amounts of text to
cracklib-format you must have
enough free space available for use by the
sort(1) command. If you do
not have 20Mb free in /var/tmp (or whatever temporary area your
sort(1)
command uses), have a look at the
/usr/sbin/cracklib-format program
which is a
sh(1) program. You can usually tweak the
sort(1)
command to use any large area of disk you desire, by use of the
-T
option.
cracklib-format has a hook for this.
cracklib-packer reads from standard input a list of sorted and cleaned
words and creates a database in the directory and prefix given by the command
line argument
cracklib_dictpath. Three files are created with the
suffixes of .hwm, .pwd, and .pwi. These three files are in the format that the
FascistCheck(3) subroutine,
cracklib-unpacker(8), and
cracklib-check(8), utilities understand. The number of words read and
written are printed on
stdout(3).
cracklib-unpacker reads from the database in the directory and prefix
given by the command line argument
cracklib_dictpath and outputs on
standard output the list of words that make up the database.
The database is in a binary format generated by the utilities
cracklib-format(8) and
cracklib-packer(8). On a Debian system
the database is located in the directory /var/cache/cracklib/cracklib_dict and
is generated daily with the program /etc/cron.daily/cracklib. The location is
also defined in the header file
crack.h using the constant
CRACKLIB_DICTPATH though none of the subroutines in the cracklib
libraries have this location hardcoded into their implementations.
FILES¶
- /var/cache/cracklib/cracklib_dict.[hwm|pwd|pwi]
- cracklib dictionary database files used by utilities.
- /etc/cron.daily/cracklib
- cracklib daily cron program to rebuild the cracklib dictionary
database.
- /etc/cracklib/cracklib.conf
- cracklib configuration file used by the cracklib daily cron program to
rebuild the cracklib dictionary database.
- /usr/include/crack.h
- cracklib header file defining the subroutine FascistCheck(3) and
the constant CRACKLIB_DICTPATH used to compile in the location of
the cracklib dictionary database for these utilities.
- /usr/sbin/cracklib-format
- cracklib shell script to create initial list of words for dictionary
database.
SEE ALSO¶
FascistCheck(3),
cracklib-check(8),
update-cracklib(8),
create-cracklib-dict(8)
/usr/share/doc/libcrack2/libcrack2.html
/usr/share/doc/cracklib-runtime/cracklib-runtime.html
AUTHOR¶
cracklib2 is written by Alec Muffett <alecm@crypto.dircon.co.uk>.
Manual added by Jean Pierre LeJacq <jplejacq@quoininc.com>.