May Have Pre-generated Ssh Host Keys

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We dont want the same keys as the next man do we (MITM). Move the default Kali ssh keys to a new folder: This will move your default keys to the new folder. Regenerate the keys: Creating SSH2 RSA key; this may take some time. Creating SSH2 DSA key; this may take some time. Support for Kali can be obtained via various methods listed on the Kali Linux Community page. These images have a default password of “toor” and may have pre-generated SSH host keys. We generate fresh Kali Linux image files every few months, which we make available for download. When attempting to guess a key generated at boot time (like a SSH host key), those keys with PID values less than 200 would be the best choices for a brute force. When attacking a user-generated key, we can assume that most of the valid user keys were created with a process ID greater than 500 and less than 10,000. Jan 17, 2016  Each host should have its own set of SSH keys. As of now, the SSH keys are generated during the install of the package openssh-server. That means the keys end up in the image. For a clean solution, we should probably remove the pregenerated keys during build of the rootfs. Additionally, we have to make sure the keys are regenerated on first boot.

Lab Configuration

VirtualBox configuration

Install VirtualBox as well as the Oracle VM VirtualBox Extension from Oracle's VirtualBox website: https://www.virtualbox.org/wiki/Downloads.

Double click on the latest Kali *.ova. VirtualBox will start and ask you to import the VM. You can change the name, and make sure to check 'Reinitialize MAC addresses of all network cards'. Then click next untill the end (you can change these settings later).

Once the VM is imported, click on Configuration. Go to the Network tab and create two adapters:

  • Set the first one to NAT
  • Set the second one to Private host only

Repeat for the CTF4 .ova file, but only create one network adapter to Privaate Host only. Again, do not forget to 'Reinitialize MAC addresses of the network card' (in advanced settings of the adapter).

Hyper-V configuration (Windows 10) - NOT WORKING YET

Networking

  • Virtual Switch Manager, create a new Internal one and name it Pentest
  • Go to Network and Sharing center -> change adapter settings, select your ethernet or Wifi adapter, right click -> properties.
  • Go to the Sharing tab, check ' Allow other network users to connect through this computer's internet connection' and select the Pentest adapter.

Open Hyper-V Manager

  • Import Virutal Machine
  • Select the folder Virtual Machines from the Kali-Linux-2016.2-hyperv-amd64 download
  • Connect it to the Pentest switch

Then we need to create CTF4

  • New Virtual Machine
  • Name it CTF4
  • First Generation (important, otherwise it won't load)
  • Startup memory 1024, use Dynamic
  • Connect it to the Pentest switch
  • Use an existing virtual Hard Disk, browse to the ctf4.vhdx

Now download a small DHCP server and install it on your host machine. Alternatively, you can also configure a NAT Windows Server image

VMWare Workstation configuration

Start VMWare Workstation, click on 'Open a Virtual Machine', select the Kali Linux file. This will start the VM in VMWare. If you are prompted with 'did you move or copy it', select 'Moved it'.

Then open the settings of the VM, go to Network Adapter and set VMNet8 (NAT). This allows to have your VM on a private network but still provide it with internet access. Your host (your physical computer) will also be able to access this machine, using ssh for example.

Repeat for CTF4 (the VMWare image is in the .wip download), That's it! (Also put CTF4 on the VMNet8).

Configure the Kali VM

  1. Start the VM. On the boot screen (GNU GRUB), select the first option (Kali GNU/Linux).

  2. Enter the default username ('root') and password ('toor')

  3. -- forAZERTY keyboards only -- On the desktop, click in the top right corner on the 'Settings' icon and go to 'Region and language'. Alternatively, you can also press the Windows key and type 'region and language'

    1. In the input sources, add the keyboard 'French'
    2. Once added, remove the US Keyboard. This will allow to boot with a French keyboard when typing your password

  4. Open a terminal and type passwd

    1. Supply your new password
    2. Confirm it
    3. This is now the password used to login to your VM

  5. If you use a High DPI device, it is recommended to run the following command to setup scaling:

  6. Go to the settings again, then Privacy, click on Screen Lock and Disable the Automatic Screen Lock.

Configure the network

By default, DHCP is disabled on Kali Linux.

Add the following lines (press 'i' to go in insertion mode, allowing you to type)

If you are using VirtualBox, also add the following line to configure both networkadapters:

Then press 'Esc' and type :wq to save the changes.In the terminal, type the following command to restart the network service

You should now be connected to internet. Try it by starting Iceweasel and search something on google.

Configure SSH

SSH is a very convenient way to run commands on your Kali Linux machine from a remote host. This is very useful if you use Cmder or CYGWIN on Windows since it has built in ssh support.

Regenerating SSH keys

Kali linux comes with pre-generated SSH keys. It is important to regenerate them, otherwise you would be vulnerable to MITM (Man in the Middle) attacks.Follow the procedure below to regenerate your SSH keys.

Move the default Kali ssh keys to a new folder:

Regenerate the keys:

Compute the md5sum of your new keys

Now do the same for the default keys

Make sure that the hashes are different, otherwise it means you did something wrong.

Configuring the SSH service

Now that we have good SSH key, we need to configure the SSH service.

This will download and install the openssh server. Run the following commands to make it start automatically when your VM boots:

Now, edit the following file:

And set PermitRootLogin to PermitRootLogin yes. Again, press 'Esc' and :wqto write and quit.

Now, very important part, setup your MOTD (message of the day). This is displayed when you will login using SSH from a remote host. Go the following website: http://patorjk.com/software/taag and type your welcome message. Then set it as your message of the day by editing the following file. Type 'i' to go in insert mode and paste the content using Ctrl+Shift+v. Don't forget to press 'Esc' and :wq to save the changes.

Once done, restart the SSH service:

Testing the connection

Restart the VM.We can now test the SSH connection from your remote host or Windows Machine. the first thing we need is the IP address of your VM.

You should see two ethernet interfaces: eth0 and eth1. One of them is connected to a local network and has an address that starts with 192.168.xxx.xxx, this is one you should save.

Now go back to your Windows Host and type the following command in Cmder (replace the xxx by the actual IP address of your Kali VM):

You should be prompted to type your password, type it and you should see your MOTD followed by a prompt root@kali. This means that you are now connected in SSH on your Kali VM. For convenience, you can create an alias in Cmder to avoid typing the IP address everytime:

Keeping your Kali VM up to date

Fist off, make sure your VM has internet access (depending on what type of virtualization you use, refer to the instructions at the beginning of this guide).

May Have Pre-generated Ssh Host Keys On Mac

One of the new features introduced with Kali 2.0 is that the distribution now has an auto-update built in. Run the two following commands to get the latest version of the Kali distribution. Note that the second one might take a while.

Additional Tools

You might also want to install a few additional tools that will come handy:

Then update you fish.config (vim ~/.config/fish/config.fish) and add the following line:

This will get you the Fish shell as well as TheFuck:

Once this is done, I recommend that you switch back to a private network and take snapshot of your VM, just in case you mess things up later on.

Thomson default key generator rar. How do I create a host key file to use with my applications as I can not use system defined /etc/ssh/ssh_host_rsa_key for non-root account under Linux / Unix / Apple OS X / *BSD operating systems?
You need to use a command called ssh-keygen. This command generates, manages and converts authentication keys for ssh. It can create RSA keys for use by SSH protocol version 1 and RSA or DSA keys for use by SSH protocol version 2. he type of key to be generated is specified with the -t option. If invoked without any arguments, ssh-keygen will generate an RSA key for use in SSH protocol 2 connections. The -f option specifies the filename of the key file.

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Why create a new host key files?

You may need a new key file:

  1. Your system is compromised.
  2. Your keys are stolen.
  3. You forgotten the passphrase.
  4. Your application need a new host key.
  5. You can not read the default system key files stored in /etc/ssh/ directory but your non-root application needs key.
  6. You got an error message which read as “Could not load host key: /etc/ssh/ssh_host_key*”.

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ssh-keygen Syntax

The syntax is:

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Example

2017

Create a host key file in your $HOME/.ssh/myapp as follows. First, create a directory to store your host key file, enter:
$ mkdir -p $HOME/.ssh/myapp
To create a host RSAv2 key file, run:
$ ssh-keygen -t rsa -f $HOME/.ssh/myapp/rsa_key_file
Sample outputs: lego batman 2 download mac

Type the following commands to verify the keys:
$ ls -l $HOME/.ssh/myapp/
Sample outputs:

You can now use keys with your app:
$ mycool-app -key $HOME/.ssh/myapp/rsa_key_file -d

May Have Pre-generated Ssh Host Keys 2016

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