Save photos when entering wrong password in Ubuntu

Step 1 : Installing App to take photo (optional if already exists)

For more ways to take picture refer this article.

$ sudo apt update

$ sudo apt install ffmpeg

Step 2 : Create script to save photos

$ sudo gedit /usr/local/bin/takepic

Paste the following

#!/bin/bash

filename=`date +%s`
ffmpeg -f video4linux2 -s vga -i /dev/video0 -vframes 1 /tmp/$filename.jpg

exit 0

Save and close.

$ sudo chmod +x /usr/local/bin/takepic 

Step 3 : Configure PAM 

Backup the original file

$ sudo cp /etc/pam.d/common-auth /etc/pam.d/common-auth.orginal

$ sudo gedit /etc/pam.d/common-auth 

• Update
• auth    [success=1 default=ignore]    pam_unix.so nullok_secure
• To
• auth    [success=2 default=ignore]    pam_unix.so nullok_secure
• Add the following, next to the updated line
  
• auth    [default=ignore]               pam_exec.so seteuid /usr/local/bin/takepic

Then save it. Try and have fun

That's it folks!