Hướng Dẫn Thực Hành BackTrack: Lesson 8 - Configuring the SSH Server

{ Configuring the SSH Server }

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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
   • BackTrack: Lesson 1: Installing BackTrack 5
   
   
3. Lab Notes
   • In this lab we will do the following:
     1. Configure the SSH Server
     2. Start Up the SSH Server
    
4. Legal Disclaimer  - bài lab dùng cho mục đích học tập

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.
    • 

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
   • 

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 website www.antoanthongtin.edu.vn.
   •