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While it is not only harder for an attacker to penetrate your system, it is also harder for you or another systems administrator to access the system for legitimate purposes especially if those administrative purposes require a higher level of access (for example, root access) to the system than a normal user In this chapter, I will cover some methods of securing the incoming and outgoing connections to and from your systems, including both the connection and the traffic running across that connection I will also cover the basics of virtual private networks (VPNs) using IPSec and provide you with a practical example of joining two subnets via a VPN tunnel over the Internet In addition, I will cover some methods of securely administering your system.

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My aim is to show some practical examples of using particular applications securely and effectively while ensuring they do not put your system at risk of attack Some of the tools and applications I will cover in this chapter you will put to further practical use elsewhere in this book As a result of the practical focus on this chapter, I will not delve into a great deal of the theory behind some of the tools covered, with the exception of a brief discussion on public-key encryption that is important for everyone to understand because of its widespread use in the Unix and networking security arena..

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Any connections using TCP/IP you have open from your system are at risk from a variety of attacks. Often, your connections pass through many different networking devices and systems before reaching their final destination, which further increases the risk that someone may be

able to use the connection to gain access to or disrupt your systems or use the information flowing over that connection for nefarious purposes, such as acquiring credit card details from an e-commerce site or banking details from an e-mail The risks associated with running these types of connections are as follows: Eavesdropping: Your information is monitored or intercepted Tampering: Your information is changed or replaced Spoofing or impersonation: Someone pretends to be the recipient of your information or sends false or substituted information back to you However, a well-established methodology exists for securing connections against the risks I have articulated; it is called public-key cryptography.

1 Public-key cryptography (in conjunction with the use of digital signatures) provides a variety of functions, including the encryption and decryption of information being transmitted, authentication of the information s sender, detection of tampering, and an audit trail that allows both parties to see the information has been sent In combination, these can mitigate the risks I detailed previously What follows is a highly simplified description of public-key cryptography I aim to give you a clear understanding of the concepts involved without covering a great deal of theoretical information For example, I will not discuss widely the various ciphers you could use but instead focus on the well-known and default RSA cipher, which should provide more than adequate security for most purposes My focus is on getting you running secured connections quickly If you want more information, I recommend Netscape s Introduction to Public-Key Cryptography.

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2 In public-key cryptography you have two keys: a public key and a private key The public key is published (often in conjunction with a certificate), and the private key is kept secret The public key can be as widely distributed as you like without comprising security, but your private key must be kept secure The sender will encrypt the information they want to send with the recipient s public key They then send the information The recipient receives the information and uses their private key to decrypt the information This ensures your information is protected from monitoring or eavesdropping Added to the public-key encryption is a digital signature that addresses the issues of tampering and spoofing The signature itself is called a one-way hash or message digest A one-way hash is a mathematical function that creates a number that is a unique representation of the information to be sent.

If the information is changed in any way, then the hash is no longer a valid representation of the new information When sent with the information, this allows the signing mechanism at the receiving end to ensure the information has not been changed during its transmission from the sender to the recipient The one-way indicates that it is not possible to extrapolate the information being sent from the hash, thus preventing someone from using the hash to determine the information To generate a digital signature, the encryption approach is reversed from the original public-key encryption process The signing mechanism generates the one-way hash, and you use your private key to encrypt it The encrypted hash together with some additional.

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