Open Stock Firmware

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Revision as of 14:06, 6 September 2007 by Wasted life (Talk | contribs) (Georg's acp-commander Method)

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Georg's acp-commander Method

I just bought another LS(Live) & wanted to have it open (SSH), as close to a stock firmware box as I could for testing. There are a few fixes that should be added too.

I'll be referencing a few links to a few wiki/web articles as long as some user posts. Hopefully this will cover most of what is needed. As always I'm human & can make some mistakes. If you see anything that seems a bit odd, change it.

WARNING.. Do this at your own risk.

Have a plan

  • Research is always the best way to go.
  • Get all the doumentation you need available.
  • Understand what your going to do. No point in getting halfway through a job, only to get stuck/lost.
  • Make sure you have the software/tools available to carry out the job.
  • Probably the most important part... BACKUP, you don't want to lose your important data/system files.
  • If unsure read again, check the wiki, search the forum.... then post.

Getting Console (Telnet) Access with acp_commander

Enter the following (Replacing <IP ADDRESS> with the IP Address of your Linkstation)

 java -jar acp_commander.jar -t <IP ADDRESS> -o

You should see something along the lines of:

 Using random connID VALUE = FB6A7FCF57E6
 Using target: (your IP address)
 ** NO message **
 ** NO message **
 Password changed.

This may not happen straight away. However I have only ever had to do it a maximum of twice.

Your Linkstation should now have the telnet daemon enabled. User "root" will have a null (Blank) root password, until you change it. The telnet daemon will be available until you reboot your Linkstation.

  • Enable your firewall. (If applicable)

Now you can login to your Linkstation with telnet.

Connect with Telnet

Enter the following (Replacing <IP ADDRESS> with the IP Address of your Linkstation)

 telnet <IP ADDRESS>

and login with "root" No password should be asked.


  • First thing you want to do is set the root password & secure your Linkstation from unwanted users.

Enter the following.


You will be promted with the following.

 Changing password for root
 Enter the new password (minimum of 5, maximum of 20 characters)
 Please use a combination of upper and lower case letters and numbers.
 Enter new password:

Enter your new password, press enter. You will be then promted with:

 Re-enter new password:

Re-enter your new password. Press enter. If your passwords match (C'mon it aint hard), you will get the following notifiction:

 Password changed.

Create a startup script & config for sshd.

  • If you want to leave telnet as the preferred way of connecting then you don't have to do this. Skip to section: Adding Telnet/SSHD to your start up script (rcS)
  • The stock firmware does have the sshd binaries included. The following section will allow you to create a startup script for this.
  • Read the Vi text editor tutorial,
  • We will use vi to create & edit the '/etc/init.d/' startup script. (This script does not exist in stock, no backup needed)

Type in the following:

 vi /etc/init.d/

You will then be taken into the text editor. Press i, to get into Insert mode. Enter the following code:

Pre 1.11-1a Frimware:

 #! /bin/sh
 # Start/stop the SSH daemon.
 test -f /usr/local/sbin/sshd || exit 0
 case "$1" in
 start)  echo -n "Start services: sshd"
         /usr/local/sbin/sshd -f /etc/sshd_config 2> /dev/null &
 stop)   echo -n "Stop services: sshd"
         killall sshd
         $0 stop
         $0 start
 *)      echo "Usage: $0 start|stop|restart"
         exit 1
 exit 0

1.11-1a Firmware:

 #! /bin/sh
 # Start/stop the SSH daemon
 test -f /usr/local/sbin/sshd || exit 0
 # this is used by daemonwatch
 case "$1" in
 start)  echo -n "Start services: sshd"
         /usr/local/sbin/sshd -f /etc/sshd_config 2> /dev/null &
         touch $ACTIVE_FILE
 stop)   echo -n "Stop services: sshd"
         killall sshd
         rm -f $ACTIVE_FILE
         $0 stop
         $0 start
 *)      echo "Usage: $0 start|stop|restart"
         exit 1
 exit 0  

Press Esc to exit Insert mode. Then enter :wq (colon wq) to exit vi.

We need to make sure that this file is executable we will do this with chmod

Enter the following:

 chmod 0755 /etc/init.d/


Now we need to create the config. I will use an example of a basic config to allow you access. You can add the relevant sections the you want. More info can be found There already exists a config file for sshd, this has nothing enabled. We will make a backup copy of this before editing. Enter the following:

 cp /etc/sshd_config /etc/sshd_config.bak

Use vi to edit the config file.

 vi /etc/sshd_config

Make sure that the file has the following changed/uncommented:

 port 22
 Protocol 2,1
 PermitRootLogin yes
 StrictModes yes
 Subsystem       sftp    /usr/local/libexec/sftp-server

Exit Vi.

Then test that your startup script & config work by entering the following.

 /etc/init.d/ start

Assuming that you have no errors all is fine. You can now login to your Linkstation with your ssh client.

Adding Telnet/SSHD to your start up script (rcS).

  • Backup before editing.

The file for editing will be '/etc/init.d/rcS' this has all the init scripts defined for startup. Make a backup of this by entering the following:

 cp /etc/init.d/rcS /etc/init.d/rcS.bak

Edit this with Vi

 vi /etc/init.d/rcS


To enable telnet at startup, uncomment the line if it exists (Does exist in some firmwares).

 # /usr/sbin/telnetd

so it looks like



  • If you have taken the option to enable sshd you can add the to this file also.

I prefer to keep the file as close to default as possible I will add it to the same section as stock. Add to the line containing (This is for LS-Live, Pro has less scripts to start)

 echo "** step3 **"
 for cmd in
         exec_sh $cmd

Like So:

 echo "** step3 **"
 for cmd in
         exec_sh $cmd

Exit vi

Optional Files & Fixes

Time discrepancies

Some might notice in their logs that there are some errors with backups, system time etc. The reason for this is the hardware clock is not updated by sytem time. The file is missing. This can be resolved by creating a symlink to

 ln -s /usr/local/bin/ /usr/local/bin/


By default in the stock firmware /dev/null is only accessible to root. Change the permissions for /dev/null for all user access:

 chmod 0666 /dev/null


When logging in as a non root user, The error "Permission denied" will be displayed. Change the permissions for /etc/profile for all user access:

 chmod 0644 /etc/profile

Addon Files.

To add some extra files namely wget, su & joe. Download: and transfer it to a share. cd to wherever you transferred it to & execute:

 tar -C / -xzvf addons.tar

Set the suid bit on su:

 chmod 4755 /bin/su

Note: If you have a LS Live or running firmware 1.10 or above you will need to download libproc, this is not included with the above.

 tar -C / -xzvf libproc-3.2.6_arm9.tgz
 ldconfig -v

Full version of ps

The version of ps that is supplied is extremely limited, to get the full version.

Backup the original:

 cp /bin/ps /bin/ps.bak

Download the newer version:

 cd /bin/

Daemonwatch.. Adding sshd.

For those that have taken the option to have sshd as their preferred way of connecting to their Linkstation. sshd can be added to the daemonwatch list, if it falls over for any reason it will be respawned.

Backup '/etc/daemonwatch.list'

 cp /etc/daemonwatch.list /etc/daemonwatch.list.bak

Add the sshd pid & startup script to it.

Pre 1.11-1a Firmware

 /var/run/apache/       /etc/init.d/ restart
 /var/run/               /etc/init.d/ restart
 /var/run/     /etc/init.d/ restart
 /var/run/       /etc/init.d/ restart

To test.. spawn telnet as a backup for access.


Then stop sshd:

 /etc/init.d/ stop

You should then be disconnected from your ssh session. The daemonwatch process should have detected that sshd has stopped & restarted. You should now be able to log back in.. However if not.. You have your telnet access to fall back on & investigate. In '/var/log/linkstation.log' you should see the following entry.

 Jul 29 10:56:55 HS-320 daemonwatch: pid [/var/run/] does not exist

1.11-1a Firmware

 /var/run/apache/       /var/run/active_httpd   /etc/init.d/ restart
 /var/run/               /var/run/active_smb     /etc/init.d/ restart
 /var/run/     /var/run/active_clientUtil_server      /etc/init.d/ restart
 /var/run/               /var/run/active_sshd    /etc/init.d/ restart  

To test.. spawn telnet as a backup for access.


Then stop sshd:

 killall sshd

You should then be disconnected from your ssh session. The daemonwatch process should have detected that sshd has stopped & restarted. You should now be able to log back in.. However if not.. You have your telnet access to fall back on & investigate. In '/var/log/messages' you should see the following entry.

 Sep  6 08:57:15 LSPRO daemonwatch[874]: pid [/var/run/] does not exist

Lastlog Errors.

You may get some errors when logging in with ssh etc. 'var/log/lastlog' does not exist. Lastlog entries are never entered.

 Aug  4 13:27:00 LS-250GL sshd[20020]: lastlog_perform_login: Couldn't stat /var/log/lastlog: No such file or directory
 Aug  4 13:27:00 LS-250GL sshd[20020]: lastlog_openseek: /var/log/lastlog is not a file or directory!

To get rid of the lastlog errors.

 touch /var/log/lastlog
 chmod 0744 /var/log/lastlog

Now when you login you should get the last login message when logging in.

 Last login: Sat Aug  4 14:23:20 2007 from xyz.localdomain

Revision Info:

That's all I have at the moment. More can be added, some taken away. Just some of the things I've done to make my life a little bit easier.

  • 1.0 - 29 July 2007 : Initial Post
  • 1.1 - 01 Aug 2007 : Fixed typo
  • 1.2 - 04 Aug 2007 : Added Lastlog Errors
  • 1.3 - 06 Aug 2007 : Added libproc for Live & 110 firmwares
  • 1.4 - 31 Aug 2007 : Added Changes to deamonwatch for 1.11-1a firmwares (Thanks wasted life)
  • 1.5 - 31 Aug 2007 : Added su permission fix (Thanks wasted life)
  • 1.6 - 03 Sep 2007 : Added full version of ps --Wasted life
  • 1.7 - 06 Sep 2007 : Added testing for sshd and deamonwatch on 1.11-1a --Wasted life

Other Methods

We have successfully managed to create a telnet-enabled firmware for the LS-GL. Fortunately for us, the LS-GL already came with a telnet binary in the stock firmware. Telnet can be enabled by uncommenting line 42 in /etc/init.d/rcS and repackaging hddrootfs.

There is a pre-made telnet enabled firmware available at here.

Note: The above firmware package does enable root access.

Removing Root Password

There are two known successful ways for removing the root password. You can use the "manual method" or uses a special "clearroot" method (The telnet enabled firmware contains the "clearroot" method). Possibly a third method is to use the firmware updater's debug tags.

Manual Method

The general idea is to open connect the sata drive to a desktop running a linux distribution (i.e. Knoppix or Ubuntu). Then remove root password in /etc/shadow.

Detailed Steps

1) Connect the hard drive to a pc running Linux (i.e. Knoppix boots directly from cd/dvd)

2) Find out how it was recognized. (i.e. in Knoppix there are some shortcuts on the desktop).

3) Open a shell/commandline/terminal.

4) Mount the second partition of the sata hdd to somewhere.

5) Delete everything on the partition

6) Download the telnet enabled hddrootfs.img located in this zip

7) Unzip will be prompted for a password. it is:


8) Untar the resulting file to the second partition:

tar xzvf <file> <path_where_you_mounted_the_second_partition> 

9*) mount /dev/sda1 (assuming the sata drive is the first special drive connected on the pc) somewhere

  • extract conf_saved.tgz, remove password in etc/shadow to look like:

10*) re-tar the contents of conf_saved.tgz, replace conf_saved.tgz to /dev/sda1, umount

(*)These steps still need to be tested further!!!

  • Steps originally drafted by mindbender.

Heinz' Script Method

Heinz made a script to automatically convert a downloaded stock firmware into a telnet enabled firmware with root access. The script is made for the German firmware. The script is available here. Heinz also made a pre-made firmware package with his script. It can be downloaded here.

  • Testing Needed

The script mainly does the following things:

  • retrieving the actual firmware update from the buffalo site.
  • unzip the archive to a tmp directory
  • modify linkstation_version, because the updater only updates "newer" firmwares. It seems this can be overwritten in the debug mode (see georg's changes)
  • for modifing the installed image. it is unzipped (using the current password)
  • then to start the (already installed) telnetd, some comments in the rcS script are removed.
  • because the password of the root login is not known, it needs to be removed. Modifing /etc/shadow had not worked, so currently we change the web interface, which runs with root permissions, to do it for us.
  • reverse the whole zip/tar process to create a useable firmware update again.


Georg's Script Method

Georg modified Heinz' automatic script. For those with access, the script it is available in LS_Pro Temporary Upload Folder for Telnet Enabled Firmwares The script untars the firmware, sets the current dates in linkstation_version.txt (allows exchange of kernel etc.) and adds the debug flag for LSUpdater.exe. Further telnetd is started during boot and the web interface scripts are altered in order to clear the root password when "creating" user 'clearroot'. Thanks to MartinP, the latest version uses the correct path to passwd (/usr/sbin). It also offers command line parameters to exchange kernel, uboot and untar an additional tar file into the root file system (see option -h).

  • Testing Needed

Run the script as user root, if the zipped firmware file is not present, the script tries to get it from buffalos server. If you don't want the script to delete the temporary directory (e.g. to directly run LSUpdater.exe or for further modifications) add option -d.