Not for local password authentication.
https://github.com/pibara/pam_unix/blob/master/unix_chkpwd.c...
Yes, for local password authentication.
The code you linked to isn't the code for a wrong password. It's a check to make sure you're using a TTY. That code isn't to prevent brute force. The delay there is 10 seconds.
The 2 second delay is in support.c at https://github.com/pibara/pam_unix/blob/5727103caa9404f03ef0...
It only runs if "nodelay" is not set. But you might have another pam module setting its own delay. I have pam_faildelay.so set in /etc/pam.d/login
Change both the config files and you can remove the delay if you want.
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Yes, for local password authentication.
The code you linked to isn't the code for a wrong password. It's a check to make sure you're using a TTY. That code isn't to prevent brute force. The delay there is 10 seconds.
The 2 second delay is in support.c at https://github.com/pibara/pam_unix/blob/5727103caa9404f03ef0...
It only runs if "nodelay" is not set. But you might have another pam module setting its own delay. I have pam_faildelay.so set in /etc/pam.d/login
Change both the config files and you can remove the delay if you want.