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File Transfer Protocol [FTP]) If IPsec is enabled between the client and the FTP server, then all the information is encrypted IPsec con guration is commonly performed to con gure a server to allow communication only if it is encrypted with IPsec, which helps secure all access and is the base of a type of Network Access Protection (NAP) IPsec as a requirement means communication is possible only with computers that are part of a trusted infrastructure; this is commonly known as domain isolation and means that only members of the domain are allowed to participate in the IPsec communication You can also be more granular and use IPsec con guration to provide server isolation by con guring speci c servers to allow only communication from domain members, speci c computers, or hosts in a speci c AD security group Imagine that you had a sensitive SQL Server database server that contained human resources (HR) information You could use IPsec con guration to allow communication via IPsec and between only computers that were part of the AD domain and were a members of the HR computers AD group IPsec has two capabilities: It can provide an authentication guarantee via the Authentication Header (AH), which provides integrity assurance for IP packets by creating a hash value based on the content of the packet and the routing information in addition to sequence information If the packet were modi ed in any way, the hash in the AH does not match, and the receiving party knows the packet had been compromised Whereas the AH header provides an integrity and authenticity guarantee, it does nothing to protect the content of the data from being snooped on The other capability is the Encapsulating Security Payload (ESP) protocol which encrypts the payload content and also provides integrity and authenticity via its own ESP header and trailer, which surround the original packet You don t have to use AH if you are using ESP (but you can) There are two IPsec modes: transport and tunnel Transport mode is designed to be used between two hosts, and only the payload, which is the data being transferred, is encrypted/authenticated; the IP header is not modi ed If you use IPsec authentication, which uses a hash value to ensure that the packet has not been modi ed, you cannot translate the IP address, for example, if going over a network that uses network address translation (NAT) because the IPsec AH uses the IP address as part of the hash value algorithm, and if the IP address changed, the hash calculation would be invalid Tunnel mode solves the NAT issue by encrypting/authenticating the entire IP packet (headers and the payload) and then encapsulating the
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encryption packet into another IP packet for routing purposes Because the original IP packet was encrypted/authenticated and an additional IP header is used for the actual data transmission, the communication between hosts can be through NAT networks and also typically creates tunnels between networks With Windows Vista and Windows Server 2008, the encryption and key exchange cryptographic algorithms were enhanced to support new compliance requirements, and you now can use the following:
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Encryption Encryption protocols include Data Encryption Standard (DES), which uses a 56-bit key and is not recommended; Triple DES (3DES), which uses three 56-bit keys; and Advanced Encryption Standard, which has a 128-bit key size (AES-128), AES192 (192-bit key size), and AES-256 (256-bit key size) You can use AES only on Windows Vista and Windows Server 2008 Key exchange Key exchange protocols include Dif e-Hellman Group 1, 2, and 14; Elliptic Curve Dif e-Hellman P256 (ECDH P-256); and ECDH P-384 You can use ECDH P-256/384 only when all systems involved in the communication are running either Windows Vista or Windows Server 2008
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Server Con guration Con gure IPsec via connection security rules and the IPsec settings as part of the computer s properties, as shown in Figure 4-35 The IPsec settings are broken out in the key exchange, data protection, and authentication settings Notice the terms Main Mode and Quick Mode in this dialog You also see them when you look at the security associations under monitoring What are these modes Security associations (SAs) contain the information needed to determine how traf c is to be secured between systems participating in IPsec as well as details of the security services, protection mechanisms, and the cryptographic keys that will be used For communication, there are two types of SA: Internet Security Association and Key Management Protocol (ISAKMP) and IPsec The ISAKMP SA is known as the main mode SA and is used for the initial IPsec security negotiation The initial negotiation is used to agree on the suite of cipher settings (known as the ciphersuite) and keys that will be used for the main communication between the two computers, in addition to authentication of the computers The use of the
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