Problem getting user input through script called by pam_exec

I was trying to use pam_exec.so on Ubuntu to call a script, prompt for user input and allow the user to log in through SSH if the script exits with an exit code of 0. I was unable to get this to work. So I wrote a simple script as follows to test pam_exec.so and see if the problem was with my original script. However I am getting the same issues even with this simple script. /usr/local/bin/test.sh #!/bin/bash echo -n "Please enter your name:" read name echo "Hello $name" I called it by including the following line after @include common-auth in /etc/pam.d/sshd auth required pam_exec.so stdout /usr/local/bin/test.sh But when I SSH into this system as seen below, I do not get a prompt to enter any input. As soon as I enter the password, I get logged in. However, the output of the script is visible. Then I changed the above script as follows to exit with an exit code of 1 if no input is given. #!/bin/bash echo -n "Please enter your name:" read name if [ -z "$name" ] then exit 1 else echo "Hello $name" exit 0 fi Then I am unable to SSH into the system (screenshot below) even when I enter the correct password and I do not see any output of the script. So what I want to know is how can I correct this problem and use pam_exec.so to run a script, get user input, and allow ssh authorization only if that script exits with an exit code of 0?