Free 30-day trial.Install ffmpeg , we're going to use this as a command line way of grabbing the webcam images. Send invoices, track time, manage receipts, expenses, and accept credit cards. Using SSH, a virtual terminal or via the regular login screen, it doesn't matter as everything is handled by PAM in the end.The best cloud based small business accounting software. Use this high quality app to trigger an alarm & capture a photo of intruder entering in wrong password.This is an approach using PAM and will work for all failed login attempts.
App Laptop That Takes Pictures When Wrong Login Is Put In Install Anything SeparatelyBy doing gksudo gedit /etc/pam.d/common-auth. Check if you see files appearing in /tmp/vid.jpg.Configure PAM to call this on every failed attempt.Note: do this carefully - if this fails you'll not be able to gain access to your system again in a regular way.Open a terminal window with root access ( sudo -i) and leave it open - just in case you screw up in the next steps.Open /etc/pam.d/common-auth in your favourite editor, e.g. Chmod +x /usr/local/bin/grabpicture.Test it, by just calling it: /usr/local/bin/grabpicture. /usr/local/bin/grabpicture with the following content: #!/bin/bashFfmpeg -f video4linux2 -s vga -i /dev/video0 -vframes 3 /tmp/vid-$ts.%01d.jpgExit 0 #important - has to exit with status 0Change the /dev/video0 with the actual video device of your webcam and choose a path where the pictures are being saved - I just choose /tmp.In the newer version of Ubuntu use avconv instead of ffmpeg ( sudo apt-get install libav-tools).Make it executable, e.g. No need to install anything separately.Create a small script somewhere, e.g. We can use avconv in place of ffmpeg in the below script.In a new terminal window, as regular user, try su -l username to log in as another user with username username (change with an actual one of course). No need to restart anything. This is an important step If you failed this step see below how to recover (***).Right below there, add a new one to call the actual script: auth pam_exec.so seteuid /usr/local/bin/grabpictureSave and close the file. On my 12.04 system it looks like this: auth pam_unix.so nullok_secureIn this line change the success=1 to success=2 to have it skip our script on success. By default there's one line before the one with pam_deny.so. ![]() GDM, SSH, terminal user authentication, sudo. Enable the service by running the following command in the terminal:The authorization Log will contain all sorts of failed logins or authentications ( ie. Start the service by running the following command in the terminal: Copy and paste the following code into the editor, replace USERNAME with your username and save it by pressing Ctrl + X then press Y then press Enter : Create and edit a custom systemd service to run the shell script at boot by running the following command in the terminal:Sudo nano /etc/systemd/system/TakePicture.service This log is useful for learning aboutUser logins and usage of the sudo command.On a failed login attempt, a record will be appended to the /var/log/auth.log file and the last line will contain something like: pam_unix(gdm-password:auth): authentication failure If you constantly monitor the file for modification and check if the last line contains the keyword failure with for example grep failure then you know a failed login attempt has just occurred and you can run whatever command you want based on this action.Change echo "failed login" in the scripts below to the command youYou can monitor the last line of the /var/log/auth.log file with a script like this: #!/bin/bashOr even better, you can install inotify-tools and use inotifywait to monitor the file instead of the sleep 1 and the script will be like this: #!/bin/bashWhile inotifywait -q -e modify /var/log/auth.log >/dev/nullInotify-tools can be installed with the following command: sudo apt install inotify-toolsTo run this solution as a system service, please follow these steps:Copy and paste the script code above ( without echo "failed login" as I added this line for debugging purposes only ) into a file in your home directory and name it TakePicture.sh and save the file.Make the shell script file executable by running the following command in the terminal: Apk merubah format file jadi txtThis way the script will only be triggered if an actual failed physical login happens.
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