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(BackTrack: Lesson 8)

{ Configuring the SSH Server }


Section 0. Background Information
  1. What is SSH?
    • Secure Shell (SSH) is a cryptographic network protocol for secure data communication, remote shell services or command execution and other secure network services between two networked computers that connects, via a secure channel over an insecure network, a server and a client (running SSH server and SSH client programs, respectively).

  2. Pre-Requisite
  3. Lab Notes
    • In this lab we will do the following:
      1. Configure the SSH Server
      2. Start Up the SSH Server
     
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Section 1: Log into BackTrack5
  1. Start Up VMWare Player
    • Instructions:
      1. Click the Start Button
      2. Type Vmplayer in the search box
      3. Click on Vmplayer

     

  2. Open a Virtual Machine
    • Instructions:
      1. Click on Open a Virtual Machine

     

  3. Open the BackTrack5R1 VM
    • Instructions:
      1. Navigate to where the BackTrack5R1 VM is located
      2. Click on on the BackTrack5R1 VM
      3. Click on the Open Button

     

  4. Edit the BackTrack5R1 VM
    • Instructions:
      1. Select BackTrack5R1 VM
      2. Click Edit virtual machine settings

     

  5. Edit Virtual Machine Settings
    • Instructions:
      1. Click on Network Adapter
      2. Click on the Bridged Radio button
      3. Click on the OK Button

     

  6. Play the BackTrack5R1 VM
    • Instructions:
      1. Click on the BackTrack5R1 VM
      2. Click on Play virtual machine

     

  7. Login to BackTrack
    • Instructions:
      1. Login: root
      2. Password: toor or <whatever you changed it to>.

     

  8. Bring up the GNOME
    • Instructions:
      1. Type startx

     

  9. Start up a terminal window
    • Instructions:
      1. Click on the Terminal Window

     

  10. Obtain the IP Address
    • Instructions:
      1. ifconfig -a
    • Note(FYI):
      • My IP address 192.168.1.111.
      • In your case, it will probably be different.

     

Section 3: Try Starting the SSH Server
  1. Check for SSH Server Process
    • Instructions:
      1. ps -eaf | grep sshd | grep -v grep | wc -l
    • Note(FYI):
      • ps -eaf: Show me all the processes.
      • grep ssh: Show me only sshd process.
      • grep -v grep: Don't show me my own grep process.
      • wc -l: Count the number of lines (i.e., processes) returned.
      • IF 0 is returned, THEN continue to next step.
      • IF the number is greater than 0, THEN continue to next section.

     

  2. Try Starting the SSH Server
    • Instructions:
      1. /etc/init.d/ssh start
      2. ps -eaf | grep sshd | grep -v grep
      3. ssh student@localhost
    • Note(FYI):
      • For Step 2.1, the rsa and dsa host keys will probably not be generated.
      • If Step 2.3, you will probably get a Connection reset by peer, since the host keys are not generated.
      • If you did not receive the message from Step 2.1 and 2.3, then your ssh server is configured correctly and there is no reason to continue.

     

  3. Stop the SSH Server
    • Instructions:
      1. /etc/init.d/ssh stop

     

  4. Create RSA Host Key
    • Instructions:
      1. ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
      2. Press <Enter>
      3. Press <Enter>

     

  5. Create DSA Host Key
    • Instructions:
      1. ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
      2. Press <Enter>
      3. Press <Enter>

     

  6. Start the SSH Server
    • Instructions:
      1. /etc/init.d/ssh start
      2. ps -eaf | grep sshd | grep -v grep
      3. ssh student@localhost
      4. yes
      5. Press <Ctrl> and c

     

Section 4: Proof of Lab
  1. Proof of Lab
    • Instructions:
      1. ps -eaf | grep sshd | grep -v grep
      2. netstat -nao | grep ":22"
      3. ls -l /root/.ssh/known_hosts
      4. date
      5. echo "Your Name"
        • This should be your actual name.
        • e.g., echo "John Gray"
    • Proof of Lab Instructions:
      1. Do a PrtScn
      2. Paste into a word document
      3. Upload to Moodle.

     

 



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