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Manages local security policy Manages audit policy and settings Generates tokens that contain user and group information as well as information about the security permissions for the user

configure the firewall device to allow inbound traffic from a series of IP addresses that you specify Unless you have a static IP address (or set of static addresses) from which you want to guarantee inbound connectivity, this solution is less than ideal because it s normally impossible to determine which IP addresses you ll be given by a Dynamic Host Configuration Protocol (DHCP) server, particularly if you travel with a laptop or use a number of remote networks Even if you do have one or more static IP addresses that you want to grant access to, this solution is of limited value unless you can guarantee that only machines that you manage will use those addresses You must also guarantee that those machines will always be well patched and not run any malicious Internet worms or Trojan horse applications.

The LSA validates your identity based on which of the following two entities issued your account:

LSA. The LSA can validate your information by checking its own Security Accounts Manager (SAM) database. Any workstation or member server can store local user accounts and information about local groups. However, these accounts can be used for accessing only that workstation or computer. Security authority for the local domain or for a trusted domain. The LSA contacts the entity that issued your account and asks it to verify that the account is valid and that you are the account holder.

Part III:

Additionally, a clever hacker could determine the range of IP addresses that are commonly connecting to your network and configure his system to spoof, or appear to be connecting from, one of those addresses to penetrate your firewall Another option is to configure your firewall device to be managed remotely (via the Internet or a WAN connection) Then, whenever you want to connect remotely, you simply determine your local client s IP address and reconfigure the firewall to allow inbound traffic from that address Again, this solution is less than ideal because it requires a number of steps, it leaves your firewall vulnerable to hackers who might attempt to gain control of it remotely, and it requires you to remember to disable those addresses when you re done Yet another option is to place the computer that provides the VPN connection in the firewall s demilitarized zone (DMZ).

In Windows XP Professional, any user, group, or computer that can initiate action is a security principal Security principals have accounts, which can be local to a computer or domainbased A local Security Accounts Manager (SAM) database manages local accounts on the computer A domain-based SAM manages accounts in a Windows NT 40 domain Active Directory manages domain accounts in Active Directory domains For example, Windows XP Professional computers participate in a network domain by communicating with a domain controller even when no human user is logged on To initiate communications, the computer must have an active account in the domain Before accepting communications from the computer, the LSA on the domain controller authenticates the computer s identity and then defines the computer s security context just as it would for a human security principal.

78 Microsoft Visual C# 2008 Express Edition: Build a Program Now!

This security context defines the identity and capabilities of a user or service on a particular computer or a user, service, or computer on a network For example, it defines the resources (such as a file share or printer) that can be accessed and the actions (such as Read, Write, or Modify) that can be performed by a user, computer, or service on that resource The security context of a user or computer can vary from one computer to another, such as when a user logs on to a server or a workstation other than the user s own primary workstation It can also vary from one session to another, such as when an administrator modifies the user s rights and permissions.