Chapter 7. Protecting your Squid Proxy Server with Authentication

In the previous chapters, we have learned about installing, configuring, running, and monitoring our Squid proxy server. In the last chapter, we also learned about analyzing the performance of our proxy server along with the usage statistics for different resources. In this chapter, we'll learn about protecting our Squid proxy server from unauthorized access, using the various authentication systems which are available. We'll also learn to develop a custom authentication helper, using which, we can design our own authentication system for our proxy server.

In this chapter, we will learn about:

• Squid authentication

• HTTP basic authentication

• HTTP digest authentication

• Microsoft NTLM authentication

• Negotiate authentication

• Using multiple authentication schemes

• Writing a custom authentication helper

• Making non-concurrent helpers concurrent

• Common issues with authentication

So let's get on with it.