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interface is started The access token is assigned to any programs that are started by the user This is important because if the user is not allowed to access a resource, she will be unable to access the resource by starting an application Each application has the same security context as the user, because the access token is applied to the running program Figure 12-2 displays this logon process When logging on to the network, the logon process differs dramatically because then users are authenticated by the Active Directory database, not the SAM database Active Directory uses an authentication service known as Kerberos to log a user on to the network The following is a general outline of the steps involved when logging on to the network using an Active Directory account and Kerberos authentication:

The SAM database is the name of the local database of user accounts on a Windows system that is not a domain controller A domain controller uses the network-wide database, known as Active Directory

n The user enters a username, password, and a domain to log on to n The logon credentials are passed to the LSA, which then queries DNS for a

.

figUre 12-2

0 1 2 3 4

12:

n Kerberos contacts Active Directory to authenticate the user n Upon authentication, Kerberos retrieves the user s universal group

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means our internal LAN can send anything it likes into the router for forwarding onto the external network The only restriction applies if a machine on the external network or the sacrificial LAN wants to send a packet to our nternal network In this case, the packet comes into the router and attempts to go out from the router onto our internal network These are the packets we want to stop, so the access list is applied on the Ethernet 0 port for packets outbound from the router The only exception to this is if a computer on the external network tries to respond to a TCP connection request that originated from a computer on our internal network In that case, the ACK bit will be set on the packet coming from the external network, indicating that it is a reply, and the router will pass it on to the internal LAN You might think that a devious attacker could set the ACK bit on a packet to get it through our firewall An attacker might do this, but it will not help establish a connection to anything on our internal LAN, for a connection can be established only with a SYN packet, rather than an ACK To break this security, the attacker would have to inject packets in to an existing TCP stream, which is a complex procedure (There are programs of this type available on the Internet) Of course, we still have the issue of an intruder launching an attack from the server on the sacrificial LAN using UDP port numbers greater than 1023 At this stage, the only packets that can originate from outside our internal network and be passed through the router to our internal network are packets from the sacrificial LAN server to a UDP port greater than 1023 Given that SMTP uses TCP port 25, you may wonder how mail gets from the external network to the internal LAN Mail systems use the concept of the post office, which is used as a distribution center for mail messages Messages are stored in the post office and forwarded to their destination when new messages are requested by a user, typically at user login time The server on the sacrificial LAN is set up to accept mail messages from the Internet, and a post office machine on the internal LAN can be set up to retrieve mail messages on a regular basis This maintains security by allowing TCP packets into our internal network only if they are a response to a TCP request that originated from within our internal network, and allows us to retrieve mail messages from the Internet By using a three-interface router, we have reduced the number of potential security loopholes through which an intruder could gain access to our internal network We can, however, further improve the situation.

group membership has been determined, Kerberos sends a session ticket to the client that contains the user account s SID and any group memberships

Net Unreachable Host Unreachable Protocol Unreachable Port Unreachable Fragmentation Needed and Don't Fragment was Set Source Route Failed Destination Network Unknown Destination Host Unknown Source Host Isolated Communication with Destination Network is Administratively Prohibited Communication with Destination Host is Administratively Prohibited Destination Network Unreachable for Type of Service Destination Host Unreachable for Type of Service Destination Host Unreachable for Type of Service Communication Administratively Prohibited Precedence cutoff in effect

You will not be required to but be aware that Kerberos is a ticketknow all the steps during the logon process, granting service

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