Modify Linux based Network Audio System

Walzing · 08-01-2011, 03:15 AM

Hi,

what is the best way to get add a root account to a linux box, if I don't have the root password? I have a small Linux based Audio Player NAS-SC55PKE, where I need access. I want to check if I can add some functionalty to this box (mainly WPA2 support for wireless).
This is installed:
http://www.sony.net/Products/Linux/A...AS-S55HDE.html

I could connect the drive to my computer if needed. Maybe it's possbile to add an 'account' offline?

thx in advance
Walzing

kbp · 08-01-2011, 06:57 AM

Anything is possible, if you can attach the drive to your pc you can do pretty much whatever you like with it. The simplest way would probably be to bind mount /proc and /dev then chroot into the drive and simply run useradd, edit /etc/sudoers and whatever else you need to do

Walzing · 08-01-2011, 07:49 AM

Great - I thought so, that chroot would be the trick. Thx... Will test it on weekend.

cu
Walzing

Walzing · 08-07-2011, 05:32 AM

Ok,

I tried the chroot - but as it's not the same architecture, I get an error.
Is there another way to add a root user? I tried to modify passwd entry on another system with a known password hash. But it doesn't seem to work.
I managed to get the firewall disabled and to get sshd running. But as soon as I try to login, connection will be closed.

cu
Walzing

kbp · 08-07-2011, 06:37 AM

Just edit the files manually - /etc/passwd, /etc/group and the shadow files. It won't matter if the password is empty, you can change it once you login.

Walzing · 08-07-2011, 06:49 AM

Hi,

what I did is this:
1.) Backup passwd file
2.) Open passwd with vi
3.) Modify root user in passwd - ony the password field (with a password hash from another passwd file)

The only chance I have to verify, is to boot the audio system and try to login with root. But the connection is closed right after I enter password.

I added another user to passwdd - same behavior. Putty will close connection right after I enter a password.

cu
Walzing

Walzing · 08-07-2011, 08:40 AM

Ok,

empty password was accepted. But now I get 'Server refused to allocate pty'.
I am googling now - but any ideas are welcome ;-)

cu
Walzing

kbp · 08-07-2011, 09:17 AM

Might require PermitEmptyPasswords enabled in /etc/ssh/sshd_config...

Walzing · 08-07-2011, 09:20 AM

It is enabled - I can login. But I don't get a shell. I only get 'Server refused to allocate pty'.
I added this entry to fstab:
devpts /dev/pts devpts gid=5,mode=620 0 0

But I still get the above error.

cu
Walzing

Walzing · 08-07-2011, 12:41 PM

I now have access.

From a remote linux client I did:
ssh root@sony.box "/bin/sh -i"

Now I have to find out, howto configure the wlan.

cu
Walzing