Into.the.Void.

Uncle sivitos introduced the idea of using hotplug with the usb key. So here we go:

Insert this to your sysctl
kernel.hotplug = /usr/bin/usbhotplug
and then emerge xlockmore.
Now go to your /etc/pam_usb/handlers/xlock.sh, and edit it so the start function looks like this:
su - USERNAME -c "xlock -display $DISP"

where USERNAME is the name of the user that you start X with…you don’t still use X as root…do you ?

Now plug and unplug the usb key to see what happens. Normally when you unplug it your X session should be locked and you should be asked for a password. Then , when you plug your usb key back in … you should be able to return in your X session after 1-2 seconds of delay. Try it and tell me whether it works for you too 🙂

Filed by kargig at 21:58 under General,Linux
No Comments | 3,596 views

It was kinda late, and I wanted to do something tonight…something interesting. I was looking at my usb key when I had this flash…”Could I use my usb key to login to my pc with a certain account ?”.
Googling … googling… I need a PAM module to do it. eix time now!
#eix pam usb
* sys-libs/pam_usb
Available versions: 0.3.1 0.3.2
Homepage: http://www.pamusb.org/
Description: A PAM module that enables authentication using an USB-Storage device (such as an USB Pen) through DSA private/public keys.


Bingo!

I emerged it and edited /etc/pam.d/system-auth and /etc/pam.d/login
In the very first line of the files I added:
auth sufficient /lib/security/pam_usb.so !check_device allow_remote=1 force_device=/dev/sda1 fs=vfat debug=1 log_file=/var/log/pam_usb.log


Then I just did:
usbadm keygen /mnt/usb1 root 4096
as the great quickstart of pam_usb describes and I am set!

just a test then…:
$ su
#

Damn! I liked that!

and you can check the debug log too:
[device.c:371] Forcing device /dev/sda1
[device.c:346] Creating temporary mount point...
[device.c:354] Scheduling [/tmp/pam_usbI7wL6Z] for dropping
[device.c:358] Using /tmp/pam_usbI7wL6Z as mount point
[device.c:237] Trying to mount /dev/sda1 on /tmp/pam_usbI7wL6Z using vfat
[device.c:253] Device mounted, trying to open private key
[device.c:181] Opening /tmp/pam_usbI7wL6Z/.auth/root.XXXXXX
[device.c:261] Private key opened
[auth.c:207] Private key imported
[auth.c:218] Public key imported
[device.c:455] Dropping [/tmp/pam_usbI7wL6Z]
[dsa.c:77] Checking DSA key pair...
[dsa.c:87] Signing pseudo random data [1 time(s)]...
[dsa.c:94] Valid signature
[dsa.c:87] Signing pseudo random data [2 time(s)]...
[dsa.c:94] Valid signature
[dsa.c:87] Signing pseudo random data [3 time(s)]...
[dsa.c:94] Valid signature
[pam.c:207] Access granted


What about if I remove the usb key ?

$ su
Password:
su: Authentication failure
Sorry.
$


and the debug log:

[device.c:371] Forcing device /dev/sda1
[device.c:346] Creating temporary mount point...
[device.c:354] Scheduling [/tmp/pam_usbTMRHEZ] for dropping
[device.c:358] Using /tmp/pam_usbTMRHEZ as mount point
[device.c:237] Trying to mount /dev/sda1 on /tmp/pam_usbTMRHEZ using vfat
[device.c:242] mount failed: No such file or directory
[device.c:249] Unable to mount /dev/sda1, tried with 1 fs
[device.c:376] Device forcing failed, back to guess mode
[device.c:419] Cannot find any device
[device.c:455] Dropping [/tmp/pam_usbTMRHEZ]
[auth.c:186] Invalid device
[pam.c:203] Cannot authenticate user "root"


I really liked that today…felt like Mission Impossible..yeah 😛
I wonder if I could make that work with xscreensaver too…would be pretty cool, wouldn’t it ?

Filed by kargig at 05:22 under General,Linux
2 Comments | 10,592 views

If you use gtk+ with version higher than 2.4.9 you might have noticed that the acrobat reader plugin does not work with firefox. To solve this you have to take certain steps.
mkdir /opt/Acrobat7/Reader/intellinux/lib/gui
ebuild /usr/portage/x11-libs/gtk+/gtk+-2.4.9-r1.ebuild install
cp -ax /var/tmp/portage/gtk+-2.4.9-r1/image/usr/lib/* /opt/Acrobat7/Reader/intellinux/lib/gui/

Now edit ‘acoread’ (/usr/bin/acroread)

find this section in the acroread script:
intellinux)
LD_LIBRARY_PATH="`prepend "$ACRO_INSTALL_DIR/$ACRO_CONFIG/lib:$ACRO_INSTALL_DIR/$ACRO_CONFIG/sidecars" "$LD_LIBRARY_PATH"`"
export LD_LIBRARY_PATH
;;

now modify the LD_LIBRARY_PATH line, ie. the ‘intellinux)’ one to look as follows:
LD_LIBRARY_PATH="`prepend "$ACRO_INSTALL_DIR/$ACRO_CONFIG/lib/gui:$ACRO_INSTALL_DIR/$ACRO_CONFIG/lib:$ACRO_INSTALL_DIR/$ACRO_CONFIG/sidecars" "$LD_LIBRARY_PATH"`"

and you are set 🙂

try the acrobat reader plugin now 🙂

It works for me!

Filed by kargig at 01:18 under General,Linux
6 Comments | 10,937 views