pam_timestamp - Authenticate using cached successful authentication attempts

       pam_timestamp was written by Nalin Dahyabhai.

Linux-PAM                                          07/03/2025                                   PAM_TIMESTAMP(8)

       In a nutshell, pam_timestamp caches successful authentication attempts, and allows you to use a recent
       successful attempt as the basis for authentication. This is similar mechanism which is used in sudo.

       When an application opens a session using pam_timestamp, a timestamp file is created in the timestampdir
       directory for the user. When an application attempts to authenticate the user, a pam_timestamp will treat
       a sufficiently recent timestamp file as grounds for succeeding.

           auth sufficient pam_timestamp.so verbose
           auth required   pam_unix.so

           session required pam_unix.so
           session optional pam_timestamp.so

       /var/run/pam_timestamp/...
           timestamp files and directories

       The auth and session module types are provided.

       pam_timestamp - Authenticate using cached successful authentication attempts

       Users can get confused when they are not always asked for passwords when running a given program. Some
       users reflexively begin typing information before noticing that it is not being asked for.

       timestampdir=directory
           Specify an alternate directory where pam_timestamp creates timestamp files.

       timestamp_timeout=number
           How long should pam_timestamp treat timestamp as valid after their last modification date (in
           seconds). Default is 300 seconds.

       verbose
           Attempt to inform the user when access is granted.

       debug
           Turns on debugging messages sent to syslog(3).

       PAM_AUTH_ERR
           The module was not able to retrieve the user name or no valid timestamp file was found.

       PAM_SUCCESS
           Everything was successful.

       PAM_SESSION_ERR
           Timestamp file could not be created or updated.

pam_timestamp_check(8), pam.conf(5), pam.d(5), pam(7)

pam_timestamp.so [timestampdir=directory] [timestamp_timeout=number] [verbose] [debug]