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# Try SSHing from your c7host VM to your centos1 VM as your regular user accountname. Did it work?
# Create another regular user called: '''other'''
# Set the password for the newly-created called called '''other'''
# Try SSHing from your c7host VM to your centos1 VM for the account called '''other'''. Why didn't it work?
# Edit the file '''/etc/ssh/sshd_config''' to add the account '''other''' for the '''AllowUsers''' option (use a space to separate usernames instead of a comma).
'''Answer INVESTIGATION 1 observations / questions in your lab log book.'''
=INVESTIGATION 2: ADDITIONAL METHODS TO SECURE YOUR SSH SERVER =
<li>Make <u>certain</u> that you are in your centos2 VM and that you are logged in as a '''regular user''' (i.e. NOT root!) (you have been warned!)</li>
<li>To generate a keypair (public/private keys), issue the following command: <b><code><span style="color:#3366CC;font-size:1.2em;">ssh-keygen</span></code></b></li>
<livalue="14">After generating the keys it prompts you for the location to save the keys. The default is '''~/.ssh''' Your private key will be saved as <b>id_rsa</b> and your public key will be saved as '''id_rsa.pub'''. Press ENTER to accept the default, .</li><li>You will then enter be prompted for a '''pass-phrase used '''. The pass-phrase must be entered in order to establish use your identityprivate key. Pass-phrases are more secure than passwords and should be lengthy, hard to guess and reeasy to remember. For example one pass-enter phrase that meets this criteria might be ''"seneca students like to dance at 4:00am"''. Avoid famous phrases such as ''"to be or not to be"'' as they are easy to guess. It is possible to leave the pass-phrase blank but this is dangerous. It means that if a hacker were able to get into your account they could then use your private key to verifyaccess other systems you use.<br><br>The output should appear similar as what is shown below:</li></ol>
<pre style="font-family:monospace;background-color:white;border-style:none;padding-left:50px;">
</pre>
<ol><li value="15"> After generating the keys it prompts you for the location to save the keys. The default is '''~/.ssh''' Your private key will be saved as <b>id_rsa</b> and your public key will be saved as '''id_rsa.pub'''</li><li>You will then be prompted for a '''pass-phrase'''. The pass-phrase must be entered in order to use your private key. Pass-phrases are more secure than passwords and should be lengthy, hard to guess and easy to remember. For example one pass-phrase that meets this criteria might be ''"seneca students like to dance at 4:00am"''. Avoid famous phrases such as ''"to be or not to be"'' as they are easy to guess. It is possible to leave the pass-phrase blank but this is dangerous. It means that if a hacker were able to get into your account they could then use your private key to access other systems you use.<br><br></li><li16>Now issue the command <b><code><span style="color:#3366CC;font-size:1.2em;">ssh-copy-id -i ~/.ssh/id_rsa.pub ops235@centos3</span></code></b></li>
<li>When prompted for password, enter OPS235's root password</li>
<li>Try using ssh to now log into your '''centos3''' VM <u>from</u> your '''centos2''' VM. What happens? Were you required to use your pass-phrase?</li>
# Switch to your '''c7host''' VM and '''su -''' into root.
# Change to the '''/root/bin''' directory.
# Issue the Linux command: <b><code><span style="color:#3366CC;font-size:1.2em;">wget httphttps://matrixict.senecac.onsenecacollege.ca/~murray.saulops235/ops235lab7/lab7-check.bash</span></code></b>
# Give the '''lab7-check.bash''' file execute permissions (for the file owner).
# Run the shell script and if any warnings, make fixes and re-run shell script until you receive "congratulations" message.
#Arrange proof of the following on the screen:<br><blockquote><span style="color:green;font-size:1.5em;">✓</span> '''centos2''' VM:<blockquote><ul><li>have logged into centos3 VM using '''public key authentication''' (with a pass-phrase)</li></ul></blockquote><span style="color:green;font-size:1.5em;">✓</span> '''c7host''' Machine:<blockquote><ul><li>have tunneled Xwindows application from '''centos1''' via ssh</li><li>Run the '''lab7-check.bash''' script in front of your instructor (must have all <b><code><span style="color:#66cc00;border:thin solid black;font-size:1.2em;"> OK </span></code></b> messages)</li></ul></blockquote><span style="color:green;font-size:1.5em;">✓</span> '''Lab7''' log-book filled out.
= Practice For Quizzes, Tests, Midterm & Final Exam =
[[Category:OPS235]]
[[Category:OPS235 Labs]]
[[Category:CentOSS 7]]
[[Category:SSD2]]