"auth sufficient" means that device isn't required for authentication.
Have you tried "auth required"?
** Changed in: lightdm (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1159457
Title:
lightdm allows login with unplugged device needed for authentication
Status in “lightdm” package in Ubuntu:
Incomplete
Bug description:
Even if I unplugged device needed for authentication, lightdm still
allows login without the device.
How to reproduce:
1. setup pam_usb.so or pam_blue.so with "auth sufficient" on
/etc/pam.d/common-auth
pam_usb.so:
https://github.com/aluzzardi/pam_usb/wiki/Getting-Started
pam_blue.so:
http://tjworld.net/wiki/Linux/Ubuntu/BluetoothLoginAndLocking
2. login to the user with the device
3. logout
4. unplug the USB device or turning off the bluetooth device
5. press Enter to login
Expected result:
login rejected or fallback to password login
Actual result:
login allowed, without the device or password
WORKAROUND:
make sure to press Esc on lightdm *after* unplugging the device
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lightdm 1.2.3-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-26.42~precise1-generic 3.5.7.6
Uname: Linux 3.5.0-26-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
CheckboxSubmission: 65fa7c094c0293dd4e9a81057a36a8fe
CheckboxSystem: 0657dd966bc74d2b22e7c94051aa55af
Date: Mon Mar 25 01:06:44 2013
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64
(20130213)
MarkForUpload: True
ProcEnviron:
TERM=xterm
SHELL=/bin/bash
PATH=(custom, no user)
LANG=ja_JP.UTF-8
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)
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