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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_cracklib 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.

   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_cracklib:

 #%PAM-1.0
 password     required       pam_cracklib.so    retry=3
 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>

haha - 2025