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I want lightdm to skip asking for my password if my phone is nearby. How is that possible with lightdm, and unity-greeter? Also I'm interested in knowing whether its secure, because it doesn't seem being that.

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Install pam-blue:

sudo apt-get install libpam-blue

Add the pam module to lightdm:

sudo sed -i 's/^\(@include common-auth\)$/auth\tsufficient\\n\1/' /etc/pam.d/lightdm

Get the mac address and bluetooth name of your phone (the bluetooth name must not contain spaces) then open the bluescan.conf file:

sudo vim /etc/security/bluescan.conf

You should edit the file so it looks like this:

general {
  timeout = 5;
user = {
  name = Phone;
  bluemac = 00:18:13:9E:E0:DF;
  timeout = 5;

replacing "user" with your Ubuntu login name, "Phone" with the name of your bluetooth device (no spaces allowed) and "00:18:13:9E:E0:DF" with the devices mac address.

Next time you are at the login screen and click your name there will be a 5 second delay while pam finds your bluetooth device, if it does a login button will be shown, if not the regular password prompt will appear.

See: french website on pam-blue and bluetooth login and locking

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