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   pam_pwhistory    ( 8 )

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Имя (Name)

pam_pwhistory - PAM module to remember last passwords

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Синопсис (Synopsis)

pam_pwhistory.so [debug] [use_authtok] [enforce_for_root] [remember=N] [retry=N] [authtok_type=STRING]

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Описание (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.

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Параметры (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.

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Предоставляемые типы модулей (Module types provided)

Only the password module type is provided.

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Возвращаемое значение (Return value)

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.

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Примеры (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

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Файлы (Files)

/etc/security/opasswd File with password history

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Смотри также (See also)

pam.conf(5), pam.d(5), pam(8)pam_get_authtok(3)

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