pam_pwhistory -- PAM module to remember last passwords
     __________________________________________________________________

DESCRIPTION

   This module saves the last passwords for each user in order to force
   password change history and keep the user from alternating between the
   same password too frequently.

   This module does not work together with kerberos. In general, it does
   not make much sense to use this module in conjunction with NIS or LDAP,
   since the old passwords are stored on the local machine and are not
   available on another machine for password history checking.

OPTIONS

   debug
          Turns on debugging via syslog(3).

   use_authtok
          When password changing enforce the module to use the new
          password provided by a previously stacked password module (this
          is used in the example of the stacking of the pam_passwdqc
          module documented below).

   enforce_for_root
          If this option is set, the check is enforced for root, too.

   remember=N
          The last N passwords for each user are saved. The default is 10.
          Value of 0 makes the module to keep the existing contents of the
          opasswd file unchanged.

   retry=N
          Prompt user at most N times before returning with error. The
          default is 1.

   authtok_type=STRING
          See pam_get_authtok(3) for more details.

   file=/path/filename
          Store password history in file /path/filename rather than the
          default location. The default location is /etc/security/opasswd.

   conf=/path/to/config-file
          Use another configuration file instead of the default
          /etc/security/pwhistory.conf.

   The options for configuring the module behavior are described in the
   pwhistory.conf(5) manual page. The options specified on the module
   command line override the values from the configuration file.

EXAMPLES

   An example password section would be:
#%PAM-1.0
password     required       pam_pwhistory.so
password     required       pam_unix.so        use_authtok

   In combination with pam_passwdqc:
#%PAM-1.0
password     required       pam_passwdqc.so    config=/etc/passwdqc.conf
password     required       pam_pwhistory.so   use_authtok
password     required       pam_unix.so        use_authtok

AUTHOR

   pam_pwhistory was written by Thorsten Kukuk <kukuk@thkukuk.de>
