Recipe 7.11. Disabling or Limiting Access to Ctrl-Alt-Delete
7.11.1 Problem
We all know that Ctrl-Alt-Delete reboots
the machine. But is this what you want? From a security standpoint, a
machine is vulnerable when booting; and anyone with access to the
keyboard can force a reboot. Therefore, you want to disable
Ctrl-Alt-Delete for rebooting the machine, or you want to limit it to
some users.
7.11.2 Solution
To disable it completely, comment out this line in
/etc/inittab:
# ca:12345:ctrlaltdel:/sbin/shutdown -t1 -r now
To enable it for a specific set of users, add the -a
switch:
ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now
Then add your list of allowed users to
/etc/shutdown.allow.
7.11.3 Discussion
You may need to create the /etc/shutdown.allow
file, if it does not already exist.
7.11.4 See Also
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