msgbartop
A chronological documentation test project, nothing serious, really!
msgbarbottom

08 Feb 2007 Duplicating world

This command will install all of the files in the old_world_file (/var/lib/portage/world) while also adding them to the world of the new machine. The –noreplace was added in case some packages had already been installed, in order to avoid repeating one’s self.

emerge -va --noreplace $(cat old_world_file)

Tags: ,

Posted by

08 Feb 2007 Deleted ._cfg files

With –noconfmem, portage will “forget” that it has already made a ._cfg file for a CONFIG_PROTECT file, thus causing portage to reinstall the ._cfg file needed for updating.

Tags:

Posted by

29 Jan 2007 Taffic shaping

Source http://www.void.gr/kargig/blog/2007/01/14/traffic-shaping-torrentflux/

Tags: ,

Posted by

29 Jan 2007 Using a usb stick to login to gentoo Linux

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:

mount /mnt/corsair
usbadm keygen /mnt/corsair 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"

Source: http://www.void.gr/kargig/blog/2005/04/15/using-a-usb-stick-to-login-to-gentoo/

Tags: , , , , ,

Posted by

28 Jan 2007 Virtual Mailhosting System with Postfix Guide

Source: http://www.gentoo.org/doc/en/virt-mail-howto.xml

Tags: , , , ,

Posted by