Figure 15 11. Configuring the Timbuktu master password in Objective-C

Creation DataMatrix in Objective-C Figure 15 11. Configuring the Timbuktu master password

Figure 15 11. Configuring the Timbuktu master password
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To configure maximum security options for Timbuktu, open the TCP Security preference, which is also located in Preferences in the Setup menu (see Figure 15 12). Within this preference, you can prevent your system from being browse-able through Bonjour by unchecking the Register with Bonjour option. We highly recommend that you
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CHAPTER 15: Remote Connectivity
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restrict all incoming connections to be SSH-enabled by selecting the Only Accept Secure (SSH) Incoming Connections option. Also, Respond to TCP/IP Scanner should be disabled to help obfuscate your network traffic.
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Figure 15 12. Configuring Timbuktu services
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Using Secure Shell
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Telnet was once the primary method for remotely connecting to client systems with command line over remote shells. However, Telnet connections are unencrypted, and therefore insecure forms of transmitting information. As use of the Internet became more widespread, the security implications of having login credentials and user data transmitted in cleartext became unacceptable, and SSH was created. SSH is a better version of this technology, giving an administrator a remote shell (or Terminal access) to send commands to a user computer over a secure connection. These commands can be used to transfer files, connect to other systems, and run any Terminal commands. SSH should be used in those environments where opening a variety of ports to allow remote ARD connectivity is undesirable and where GUI level access is not needed to remotely manage the computer.
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Enabling SSH
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To enable incoming SSH access to your system, click the Sharing preference pane, and click Remote Login service (see Figure 15 13). From here, click Only these users, and click the plus (+) button to add users who will be allowed to remotely access the computer using SSH. Checking the box turns the Remote Login indicator light green. You can now use SSH to access the system remotely.
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CHAPTER 15: Remote Connectivity
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Figure 15 13. Using the Remote Login feature to enable SSH access
Further Securing SSH
SSH is a secure protocol, but you can make SSH even more secure with the command line by using public/private key pairs, which make it unnecessary for your password to go over the wire at all. Your private keys should be secured with a passphrase, to keep your private key safe if your system is compromised. You can store your passphrase in your keychain, but this can prove to be just as dangerous as having no passphrase at all if your system is compromised. Therefore make sure that a passphrase is set and required for every access of your keys. Connecting to an SSH host will request authentication from the client. If you have a key set, your SSH client will generate a temporary key based on your private key. It will then send this key to the server, and the server will compare it to the public keys that it has. If your public key can unlock the temporary key, you are authenticated and allowed access. If the keys fail, then SSH drops back to password-based authentication and will prompt for a password. Let s see how this works: NOTE: For the purposes of this example, we assume you haven t generated an SSH key yet.
CHAPTER 15: Remote Connectivity
First you need to make a key pair. To do this, you will use DSA as the key type to ensure that you will be connecting via the more secure SSH2 protocol:
ssh-keygen -t dsa
You will be prompted for a filename; press Return to accept the default. You will then be prompted for a key passphrase. If you want it to prompt for a passphrase, enter it now; otherwise, for unchallenged logins, hit Return to set it to blank. Now you will have your new public-private key set in ~/.ssh. The private key is named id_dsa, and the public is id_dsa.pub. For the server to use the key, you must copy your public key to it. If keys have not been used for authentication up to this point, you can simply copy the key to the remote host and rename it:
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