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pam_pwhistory — PAM module to remember last passwords
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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 in /etc/security/opasswd. 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.
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>