barcode excel 2003 free 11: Securing TCP/IP in Software

Encoder UPC Code in Software 11: Securing TCP/IP

11: Securing TCP/IP
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RADIUS Remote Authentication Dial-In User Service (RADIUS) is the better known of the two AAA standards and, as its name implies, was created to support ISPs with thousands of modems in hundreds of computers to connect to a single central database RADIUS consists of three devices: the RADIUS server that has access to a database of user names and passwords, a number of Network Access Servers (NASs) that control the modems, and a group of systems that dial into the network (Figure 11-23)
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Figure 11-23 RADIUS setup
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EXAM TIP NAS stands for either Network Access Server or Network Attached Storage Make sure you read the question to see which NAS it s looking for! To use RADIUS you need a RADIUS server The most popular choice for Microsoft environments is Internet Authentication Service (IAS) IAS comes built in with most versions of Microsoft Windows Server operating systems For the UNIX/Linux crowd, the popular (yet, in my opinion, hard to set up) FreeRADIUS is the best choice If you prefer a more prepackaged server, you might look at Juniper Network s Steel-Belted RADIUS a very powerful and somewhat easy to set up option that many people feel is well worth the roughly $3000 price tag A single RADIUS server can support multiple NASs and provide a complete PPP connection from the requesting system, through the NAS, all the way to the RADIUS server Like any PPP connection, the RADIUS server supports PAP, CHAP, and MS-CHAP Even if you use PAP, RADIUS hashes the password so that at no time is the user name/password exposed Newer versions of RADIUS support even more authentication methods, as you will soon see RADIUS performs all this authentication on either UDP ports 1812 and 1813 or UDP ports 1645 and 1646
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TACACS+ Routers and switches need administration In a simple network, you can access the administration screen for each router and switch by entering a user name and password for each device When a network becomes complex, with many routers and switches, logging into each device separately starts to become administratively messy The answer is to make a single server store the ACL for all the devices in the network To make this secure, you need to follow the AAA principles Terminal Access Controller Access Control System Plus (TACACS+) is a proprietary protocol developed by Cisco to support AAA in a network with many routers and switches TACACS+ is very similar to RADIUS in function, but uses TCP port 49 by default and separates authorization, authentication, and accounting into different parts TACACS+ uses PAP, CHAP, and MD5 hashes, but can also use something called Kerberos as part of the authentication scheme
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Up to this point almost all the authentication schemes we ve discussed are either based on PPP or at least take the idea of PPP and expand upon it Of course, every rule needs an exception and Kerberos is the exception here Kerberos is an authentication protocol that has no connection to PPP Twenty years ago some Internet folks began to appreciate that TCP/IP was not secure and, thus, designed Kerberos Kerberos is an authentication protocol for TCP/IP networks with many clients all connected to a single authenticating server no point-to-point here! Kerberos works nicely in a network, so nicely that Microsoft adopted it as the authentication protocol for all Windows networks using a domain controller The cornerstone of Kerberos is the Key Distribution Center (KDC), which has two processes: the Authentication Server (AS) and the Ticket-Granting Service (TGS) In Windows server environments, the KDC is installed on the domain controller (Figure 11-24)
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Figure 11-24 Windows Kerberos setup
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Client AS TGS
When your client logs onto the domain, it sends to the AS a request that includes a hash of the user name and password The AS compares the results of that hash to its own hash (as it also stores the user name and password) and, if they match, sends a TicketGranting Ticket (TGT) and a timestamp (Figure 11-25) The ticket has a default lifespan in Windows of eight hours The client is now authenticated, but not yet authorized
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