Planning Network Security in Software

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can talk to them, you have to make a phone call to verify their correct identity and then you have to scan the immediate surroundings to be sure no one is listening to you Only once you have completed the authentication and secured the communication environment can you begin to talk to them This is the same process that IPSec follows when systems communicate on your network Of course, you could easily implement IPSec by forcing all systems in your domain to communicate securely, but is that really warranted A successful IPSec policy is one that can blend communication efficiency with communication security Finding the correct blend requires
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Classifying data according to their needs for security Constructing security policies that meet the needs of your organization Evaluating security risks and vulnerabilities Providing the proper security mechanisms Educating end users on proper use of the security mechanisms
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The right mix of security controls will certainly be swayed by what functions a system serves For example, the security settings for a system will be different depending on whether it is a database server, domain controller, file server, web server, DNS server, or network access server Identifying the types of traffic and locations of secure information will most certainly be your first step in planning an IPSec policy As a general rule, you will find that your systems will fall into three general categories with respect to security:
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Basic security or minimal security Systems without the inherent need for secure communication These systems do not require the configuration of an IPSec policy Standard security Systems that store sensitive information but should not be configured so securely that regular communication is adversely affected These systems are good candidates for the default IPSec policies of Client (Respond Only) or Server (Request Security) (You ll learn more about these soon) High security Systems that contain highly confidential data and are prime targets for data theft or hacking These systems are ripe for implementing the Secure Server (Require Security) IPSec policy
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Once your data has been classified and tagged with the appropriate security levels, Microsoft has made the implementation of an IPSec policy rather easy Since data encryption at the domain level is rarely justifiable, the preferred
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MCSE Planning a Windows Server 2003 Network Infrastructure
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method is to group servers of similar security levels together into organization units (OUs) and use Group Policy to push down the appropriate IPSec policy Let s look at an example Say your company has a handful of file servers that hold confidential data that is crucial to the success of the company and if compromised could lead to the company s demise (like maybe the Coca Cola recipe or the code behind a popular operating system) In your company, only a dozen or so computers utilize this information You want to be able to ensure secure communication with the file servers; however, you do not want to affect the client s communication with other servers beyond the confidential servers Situations like this, where security is a primary concern for only a handful of systems, are best solved by using Organizational Units and Group Policy Our solution here is to place all secure file servers into an Organizational Unit named Secure Servers and implement a Group Policy Object that propagates the Secure Server IPSec policy to all servers within the OU This policy will force all communication to and from these servers to utilize the highest level of data encryption For the clients, since we don t want to affect everyday communication with other servers, we don t want to implement the same Secure Server IPSec policy that requires security; instead, we use the Client IPSec policy that gives the system the ability to respond to an IPSec request but will never initiate secure communication So what exactly does it mean to establish an IPSec policy An IPSec policy is made of three main components:
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Authentication methods Kerberos v5, certificates, preshared key Filter list A list of the different types of traffic that require or don t require IPSec Filter action The resulting action Permit, Block, or Negotiate Security for traffic that meets the criteria defined on the filter list
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The authentication methods for IPSec as shown in Figure 63 are provided to give administrative control over the stringency of authentication between two systems using IPSec Multiple methods can be preconfigured in order of preference and are dependent on the environment in which you are utilizing IPSec For example, in a Windows Server 2003 domain environment the option for Kerberos v5 is available, but in a nondomain environment, that option is not available Along the same lines, if you don t have a certificate implementation or have not purchased certificates from a commercial vendor, then the certificate authentication method is not possible When choosing between the different authentication mechanisms, you should avoid using the preshared key like the plague The preshared key is the
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