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IP header (inner header) Figure 4.4
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Payload
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Another use case for tunnel mode is when the user and the enterprise are concerned about revealing the IP address of their hosts. By having the IP address information, an attacker may not only be able to find out the user s location but also lay down a map of enterprise routing topology. By encapsulating the initial IP header inside an outer IP header which only bears the IP addresses for SG1 and SG2, no information about internal addressing topology is revealed to the outside world. Security architecture specification mandates the use of tunnel mode when a security gateway is the end point for the IPsec tunnel (not the end point for the communications).
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4.2.4 Security Associations and Policies
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The term security association (SA) has been used loosely in many different contexts and has caused confusion at times. Up to this point, we have been trying to avoid the use of the term security association and used the term trust relationship instead. The reason for exercising such caution is that the IPsec SAs are very strictly defined. An IPsec SA includes a well-specified set of information and is looked up and referred to in a specific way. Furthermore, the term IPsec SA establishment has a well-specified meaning: When it is said that a security association is established between two nodes, it means that the two nodes have agreed to use IPsec as a means for securing their communications, agreed on what kind of protection to use, what protocol to use (AH and/or ESP), what cryptographic transform to use, have established keys to perform the transforms, and agreed on the life time of these keys. As one can guess, the IPsec SA is a data structure that includes all the aforementioned information as well as some practical details, such as what IPsec mode to use, sequence numbers, and so on. One important fact is that if the two ends decide to use both AH and ESP protocols or the scenario dictates security protections both in tunnel and transport mode, such as a case when two hosts decide to use IPsec encryption regardless of whether a VPN tunnel exists or not, separate SAs must be established for each protocol and each mode. Another fact about IPsec SAs is that they are unidirectional. In other words, upon establishing a secure connection, the two nodes establish one SA in each direction. The receiver side of the SA assigns a security parameter index (SPI), which is a 4-octet long bit-string, to each SA and sends it to the sender side. The SPI has only local significance to the destination, even though the sender receives the SPI from the receiver. The sender only passes the SPI along with the IPsec protected packet (see AH and ESP packet formats in Tables 4.1 and 4.2) to aid the receiver with the processing of the packet. We will discuss the use of SA and SPI in IPsec processing of traffic in a later section. For now, we will suffice by saying that each SA is uniquely identified using a triplet of SPI, destination IP address, and a protocol identifier (whether it is ESP or AH). In a node that is using IPsec for secure communications with other entities, security policy is an important element that determines how the communications with those entities are handled. The security policy dictates what sort of security service is implemented for each packet as it is being received or transmitted. Three polices are applied to both inbound and outbound traffic: discard, apply IPsec (protect the packet), and bypass IPsec (send without IPsec protection).
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Since IPsec SAs are directional and security can be applied in an asymmetric manner in the two directions, the security policies are defined differently for inbound and outbound traffic. Before going through the discussion on IPsec processing, we need to describe the main databases used by IPsec.
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