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Making sure that a network operating system is secure on the network is a part of NOS security that is often neglected by systems administrators. Although this security measure is very important to maintaining security permissions and network accounts, it may not protect against someone who exploits a security flaw in the protocol stack. A Windows NT skeptic once commented to me that the only way to make Windows NT secure is to unplug it from the network and bury it in six feet of concrete. Although that solution would deter many security hacks (at least those performed without a jackhammer), it wouldn t make for a very useful server. A much better solution is to protect your server from unwanted network access attempts by removing unnecessary protocols or services. In this section, we ll look at the steps you can take to protect your system against network hacks. In most cases, all that is necessary is a few minor changes within the OS. Keep in mind, however, that new hacks and exploitations are found very frequently, so you should regularly monitor websites such as Microsoft s Security Advisor (www. microsoft.com/security) to find out the latest information on new hacking methods and security holes.
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TCP/IP Security
The TCP/IP protocol has been the target of many hacking attempts, mainly due to its ubiquity on the worldwide Internet and its widespread support for different applications. However, several ways exist to reduce the likelihood of successful attacks. First and foremost, it is very important for network administrators to pay attention to security alerts and apply the appropriate security measures to prevent these problems from occurring in their environments. For example, a large number of failed logon attempts should be investigated. Most commonly, this will involve calling a user to resolve the problem. However, in the rare case that a user is unaware of or not responsible for the password entry attempts, it will be worth the extra effort. Windows NT Server does not provide a firewall, but it does feature several ways in which the server can be made more secure. First, packet filtering for TCP/IP data can be enabled. This feature is available on a per-adapter basis and is set as part of the advanced settings for the TCP/IP protocol (see Figure 3-11). Therefore, if you have a server with an ISDN connection to the Internet and network access to a LAN, you can choose to allow only certain types of Internet packets to be recognized by the server while allowing all data to be transmitted to and from the LAN.
Internet Information Server
Microsoft s Internet Information Server (IIS) was designed to make Windows NT Server computers more accessible via intranets and the global Internet. In other chapters, we ll see how IIS can be used to help in remote administration, in FTP services, and in publishing web-based information. Although this service may prove indispensable in some environments, it can also cause many different problems for systems administrators. There are several ways to secure an IIS installation. Each involves the correct combination of IIS permissions, web application permissions, and NTFS permissions. Figure 3-12 shows the various security options.
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Figure 3-11.
Setting packet-filtering options for the TCP/IP Protocol
Figure 3-12.
Internet Information Server security permissions
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Firewalls
The purpose of networking computers is to share data. For this reason, networked environments greatly increase the risks of illegal access and unauthorized access of a system. However, security restrictions should be put in place so that only certain users can access certain resources. One method for protecting information on a network especially a network connected to a public network, such as the Internet is through the use of a firewall. An exact description of a firewall is difficult to find. At best, the term is used to describe a collection of technologies. The purpose of firewall technology, however, is obvious: to prevent unauthorized access to system resources. On its most basic level, a firewall provides packet-filtering capabilities. Instead of allowing any and all packets to traverse the network, the packet filter performs some type of check to make sure that this data should be allowed to pass. This is especially important to network security, because many networks have recently been opened up to the Internet, which essentially enables any user in the world to attempt access. Though firewalls are most commonly used to filter Internet traffic, they may also be used to enforce security between networks. The check may be based on the source address of the sending computer, or it may restrict traffic to certain packet types (FTP data in the case of an FTP server, for example). Figure 3-13 shows a firewall that accepts all TCP/IP packets originating from a remote branch office, and rejects all packets from all other users (including those from the Internet). In this example, Internet users access a web server located outside the firewall. Network Address Translation (NAT) is the second mode of protection provided by a firewall. NAT allows users to have Internet access without giving out the internal addressing scheme. NAT tables hold information that tracks the relationships between legal Internet IP addresses and those on your own network.
Figure 3-13.
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