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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | EXAMPLES | FILES | SEE ALSO | AUTHOR | COLOPHON |
PAM_PWHISTORY(8) Linux-PAM Manual PAM_PWHISTORY(8)
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.
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.
Only the password module type is provided.
PAM_AUTHTOK_ERR
No new password was entered, the user aborted password change or
new password couldn't be set.
PAM_IGNORE
Password history was disabled.
PAM_MAXTRIES
Password was rejected too often.
PAM_USER_UNKNOWN
User 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/opasswd
File with password history
pam.conf(5), pam.d(5), pam(8)pam_get_authtok(3)
pam_pwhistory was written by Thorsten Kukuk <kukuk@thkukuk.de>
This page is part of the linux-pam (Pluggable Authentication Modules
for Linux) project. Information about the project can be found at
⟨http://www.linux-pam.org/⟩. If you have a bug report for this manual
page, see ⟨//www.linux-pam.org/⟩. This page was obtained from the
tarball Linux-PAM-1.3.0.tar.gz fetched from
⟨http://www.linux-pam.org/library/⟩ on 2017-07-05. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
Linux-PAM Manual 04/01/2016 PAM_PWHISTORY(8)