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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | EXAMPLES | FILES | SEE ALSO | AUTHOR | COLOPHON |
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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]
[file=/path/filename]
[conf=/path/to/config-file]
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_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.
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_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
/etc/security/opasswd
Default file with password history
pwhistory.conf(5), 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 project's upstream Git repository
⟨https://github.com/linux-pam/linux-pam.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-12-18.) 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 12/22/2023 PAM_PWHISTORY(8)
Pages that refer to this page: pwhistory.conf(5), pwhistory_helper(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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