pam_pwhistory - PAM module to remember last passwords
pam_pwhistory.so [debug] [use_authtok] [enforce_for_root] [remember=N] [retry=N] [authtok_type=STRING]
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.
debugTurns on debugging via syslog(3).
use_authtokWhen 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_rootIf this option is set, the check is enforced for root, too.
remember=NThe last N passwords for each user are saved in /etc/security/opasswd. The default is 10.
retry=NPrompt user at most N times before returning with error. The default is 1.
authtok_type=STRINGSee pam_get_authtok(3) for more details.
Only the password module type is provided.
PAM_AUTHTOK_ERRNo new password was entered, the user aborted password change or new password couldnt be set.
PAM_IGNOREPassword history was disabled.
PAM_MAXTRIESPassword was rejected too often.
PAM_USER_UNKNOWNUser is not known to system.
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
/etc/security/opasswdFile with password history
pam.conf(5), pam.d(5), pam(8) pam_get_authtok(3)
pam_pwhistory was written by Thorsten Kukuk <email@example.com>
|Linux-PAM Manual||PAM_PWHISTORY (8)||06/04/2011|