NAME

       lockout - avoid slacking and impose productivity and discipline on yourself

WARNING

       This program is VERY DANGEROUS.  If it fails, you may end up not knowing the root password to your own
       computer (in which case you need to boot into single-user mode).  There are no known reports of this
       actually happening, but we don't know how stupid you are.  Also, you should probably not run this on a
       multi-user system.

SYNOPSIS

        lockout lock HhMm ⎪ Hh ⎪ Mm
        lockout lock HH:MM
        lockout lock HH:MMam ⎪ HH:MMpm
        lockout lock HHam ⎪ HHpm
        lockout lock

        lockout unlock [force]

        lockout status

DESCRIPTION

       Lockout is a tool that imposes discipline on you so that you get some work done.  For example, lockout
       can be used to install a firewall that does not let you browse the Web.  Lockout changes the root
       password for a specified duration; this prevents you from secretly ripping down the firewall and then
       browsing the Web anyway.  In case of an emergency, you can reboot your computer to undo the effects of
       lockout and to restore the original root password.

       Obviously, lockout lock and lockout unlock can only be run by root.  lockout status can be run by any
       user.

       lockout without any parameters shows a brief help message.

       lockout lock takes one optional parameter.  If no parameter is given, you are dropped in interactive mode
       and asked for the duration of the lock or the time at which the lock should be lifted.  You can also
       supply this as a parameter on the command line.  Lockout understands various time formats.  You can
       specify a delay, e.g., 3h (3 hours), 1h30m (1 hour and 30 minutes), or 90m (1 hour and 30 minutes), or
       you can specify absolute time, e.g., 2pm, 2:30am, 15:30, etc.  You will be asked to confirm the time at
       which lockout will unlock your system.  If you type "yes", lockout executes /etc/lockout/lock.sh and
       changes the root password to something completely random.  /etc/lockout/lock.sh is a shell script that
       you write.  It takes measures to make sure you stop slacking.  For example, it could install a firewall
       that prevents outgoing connections to port 80.  See the "EXAMPLES" section below.

       lockout unlock takes an optional force parameter.  Without any parameters, lockout lock will check
       whether it is time to unlock the system and, if so, executes /etc/lockout/unlock.sh, which is a shell
       script that you write.  It should undo the effects of /etc/lockout/lock.sh, executed when the system was
       locked.  If you pass the force parameter to lockout unlock, lockout will forcibly unlock your system,
       whether it was really time for that or not.  lockout unlock should be called every minute by cron.  See
       "CONFIGURATION".

       lockout status will print out the time at which the system is going to be unlocked.

CONFIGURATION

       /etc/cron.d/lockout must contain the following two entries:

           */1 * * * *         root    /usr/bin/lockout unlock >/dev/null 2>&1
           @reboot             root    /usr/bin/lockout unlock force >/dev/null 2>&1

       The examples that follow assume you are using sudo(8) and you have a file, /etc/lockout/sudoers.normal
       which is the normal /etc/sudoers file, and /etc/lockout/sudoers.lock, which is the /etc/sudoers file when
       lockout locks your computer.  This example also assumes you are using iptables(8).
       /var/lib/iptables/active should contain your default firewall rules, and /var/lib/iptables/work should
       contain the firewall rules that enforce discipline.  See below for an example.

       /etc/lock/lock.sh imposes discipline.  For example:

           #!/bin/sh
           /etc/init.d/iptables load work
           cp /etc/lockout/sudoers.lock /etc/sudoers

       /etc/lock/unlock.sh undoes these effects.  For example:

           #!/bin/sh
           /etc/init.d/iptables restart
           cp /etc/lockout/sudoers.normal /etc/sudoers

       Your /var/lib/iptables/work may look something like this:

           *filter
           :INPUT ACCEPT [1047:99548]
           :FORWARD ACCEPT [0:0]
           :OUTPUT ACCEPT [1104:120792]

           # allow incoming packets from localhost, ntp,
           # and existing connections
           -A INPUT -i lo -j ACCEPT
           -A INPUT -p udp -m udp --source-port ntp -m state --state ESTABLISHED -j ACCEPT
           -A INPUT -m state --state ESTABLISHED -j ACCEPT
           -A INPUT -p tcp -j DROP
           -A INPUT -p udp -j DROP

           # allow outgoing connections for email and DNS
           -A OUTPUT -d 127.0.0.1/8 -j ACCEPT
           -A OUTPUT -p tcp -m tcp --dport smtp -j ACCEPT
           -A OUTPUT -p tcp -m tcp --dport domain -j ACCEPT
           -A OUTPUT -p udp -m udp --dport domain -j ACCEPT
           -A OUTPUT -j DROP
           COMMIT

EXAMPLES

           lockout lock 2h30m   [locks out for 2h and 30m]
           lockout lock 90m     [locks out for 1h and 30m]
           lockout lock 3pm     [locks out until 3pm]
           lockout lock 3:20am  [locks out until 3:20am]
           lockout lock 15:20   [locks out until 3:20pm]

           lockout status       [shows when the system is going to be unlocked]

FILES

       /etc/lockout/lock.sh: executed when running lockout lock

       /etc/lockout/unlock.sh: executed when running lockout unlock

SEE ALSO

       usermod(8), iptables(8), passwd(1), cron(8), crontab(1)

BUGS

       Arguably, a program that changes the root password to something random with the possibility of never
       recovering the original password might be considered a bug by itself.  Other than that, no known bugs.

AUTHOR

       Thomer M. Gil, http://thomer.com/lockout/