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sure. first, configure sudo to be passwordless, or perhaps just to stay unlocked for longer (it's easy to find instructions for how to do that).
then, put this in your ~/.bashrc:
alias sudo='echo -n "are you sure? "; for i in $(seq 5); do echo -n "$((6 - $i)) "; sleep 1; done && echo && /usr/bin/sudo '
Now "sudo" will give you a 5 second countdown (during which you can hit ctrl-c if you change your mind) before running whatever command you ask it to.
In terms of security, an alias can be easily overridden by a user who can even choose yo use another shell which will not read .bashrc.
So this solution cannot force/require the user to comply to the delay requirement.
I was thinking maybe with a PAM module the delay can be achieved but I haven't found one that readily does that. Maybe OP needs to implement one :)
If an untrusted user is sitting at the console of a sudoer account, armed with its password, all is lost and any security has effectively been defeated already. While I do understand the concern it seems like something of a moot point.
pam_faildelay almost does it, but it only delays on auth failure. You would want something that delays on success. Might be almost as simple as “if not” on a check on pam_faildelay.
I can’t find anything that quite fits your requirements.
Putting a NOPASSWD option on your sudo config should cover the removal of the password requirement, but this may be ill-advised; it is probably wiser to increase the timestamp_timeout duration.
The intentional delay is tougher, and for that it looks like you’d need to write a PAM module. pam_faildelay is very close to what you need, you’d just need to make it produce a delay on success as well as failure.
What purpose should this fulfil? If you are unsure whether your command is correct, double-check it before hitting the ENTER key.
Yes; the command prefix that you're looking for is
shutdown now ; (followed by your sudo command if you wish)
It will provide the appropriate delay before using the root command via sudo or having logged again as root (sigh)!
@deadcatbounce @dontblink That's the Linux version of "press ALT+F4 to enable cheatmode" 🤣
Please don't desecrate my Linux with (what I assume is) Windows talk.
Bleugh! I need a shower!
[The worst Linux users are ex Windows users; 2004 vintage here]
