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Setting Up the VPN account
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To create this VPN, you ll first need to create an account in the Account pane of System Preferences on the client machine (for the purposes of discussion, we will refer to the client machine in this example as cedge.318.com) for our server machine to log into. The account being created should be a new account and should not be used for any other purpose than for the VPN, mainly because you ll be modifying some of the account settings that may cause a normal user to become unusable for any other purpose. In this example, we will use the account named cedge. The next step is to set up the VPN account with the ability to launch the PPP daemon. To do this, edit the sudoers file. Open the Terminal, and navigate to the file /etc/sudoers. You ll want to add the VPN Cmnd_Alias and VPN user privileges to make your sudoers file look like this one:
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# Cmnd alias specification Cmnd_Alias VPN=/usr/sbin/pppd, /sbin/route # Defaults specification # User privilege specification root ALL=(ALL) ALL %admin ALL=(ALL) ALL vpn ALL=NOPASSWD: VPN
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CHAPTER 15: Remote Connectivity
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NOTE: For more information on the sudoers file, see 3.
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Setting Up SSH
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The server machine is the machine you are using remotely. This machine will initialize the SSH connection and then respond to the PPP daemon launching on the client. In this example, the server machine is cedge.318.com. To log in to the client machine to launch pppd, you first need to generate a key, using SSH key authentication, and then copy the public portion of the key to the VPN account s home directory on the client machine. You don t need to use a password on the key, but of course it s always a good idea to do so. First establish an SSH key. To do this, use the ssh-keygen command. The following iteration of this command will build a key using the RSA encryption method:
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sudo ssh-keygen -t rsa
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The command will result in the following lines. At each colon (:), type the password you will be using:
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Generating public/private rsa key pair. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /var/root/.ssh/id_rsa. Your public key has been saved in /var/root/.ssh/id_rsa.pub. The key fingerprint is: a2:3b:11:1d:dd:aa:bd:00:ff:aa:aa:ff:00:ab:ab:11 cedge@cedgetestcomputer
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Now enter the following command to copy the key pairs to the second computer:
sudo scp /var/root/.ssh/id_rsa.pub vpn@cedgecomputer.com:~ RSA key fingerprint is a2:3b:11:1d:dd:aa:bd:00:ff:aa:aa:ff:00:ab:ab:11 cedge@cedgetestcomputer
Type yes at the verify prompt, and press the Enter key, as shown here. Once this is complete, type the password, and your preshared key setup will be complete.
Are you sure you want to continue connecting (yes/no) yes Warning: Permanently added cedge@66.4.4.2' (RSA) to the list of known hosts. cedge@cedgetestcomputer password: id_rsa.pub 100% |*************************************************************|
Once you ve copied the public key to the client system, you ll want to connect to it and finish setting up the VPN account. First ssh into the client machine and then attempt to connect to the server machine from the client to exchange host keys, as shown here:
ssh cedge@cedgetestcomputer cedge@cedgetestcomputer password:
Next, you ll want to confirm, adding the server to your client s known hosts:
ssh cedge@cedgetestcomputer The authenticity of host 'cedge (66.4.4.2)' can't be established. RSA key fingerprint is aa:aa:ff:11:11:11:aa:aa:aa:00:00:00:00:aa:aa:aa.
CHAPTER 15: Remote Connectivity
Are you sure you want to continue connecting (yes/no) yes
Verify that there is a file in the VPN account s ~/.ssh folder called known_hosts. Next, move the generated public key to the file called authorized_keys in the ~/.ssh folder.
mv ~/apress.pub ~/.ssh/authorized_keys
Finally, configure the PPP daemon to launch passively upon login. The following commands will perform this task:
echo "sudo /usr/sbin/pppd passive; logout" > ~/.login
To verify that your client machine is set up properly, use the following command from the server machine:
sudo ssh cedge@cedgetestcomputer
At this point, your server machine should have connected to the client machine, authenticated via the SSH key, and begun to see the garbled output of the PPP daemon. If this is all working properly, then your client machine is ready to go. However, you re not completely out of the woods just yet. To finish configuring the server machine, you ll need to issue a few more commands.
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