Transport Layer Security in .NET

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4.4 Transport Layer Security
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Implementing security mechanisms at network layer for end-to-end communications can run into practical problems, since the network layer needs to take care of the details of packet routing between the two communicating end parties. For IP networking, this means the routers and other network agents such as mobility agents need to access the information inside the IP header to perform routing functions. As we saw earlier, when IPsec is used to protect the packets at IP layer, the information inside higher layer headers (such as TCP headers) is hidden from outside world. Interim network management entities or middle boxes, such as network address translators (NAT) or quality of service (Qos) policing entities that need to look at transport layer ports to perform address translations or traffic shaping will not be able to do their jobs. Significant amount of design and standardization effort has been devoted to solving interoperability issues between IPsec and a variety of middle boxes and network management entities. Another serious problem for network layer security protocols such as IPsec and IKE is that they typically establish trust relationships (SAs) using IP addresses as identifiers. When a node
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The application protocol/HTTP TLS record protocol TCP IP
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Figure 4.11 TLS Protocol stack
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changes its IP address due to using Mobile IP or other methods, the original SAs are no longer valid. Finally, IPsec and its key management procedure (IKE) were not designed to incorporate use of certificates as a means of dynamic key management procedures and hence IPsec implementers may suffer from key management scalability issues. For the reasons mentioned above, implementing security at transport layer has been seen as an attractive solution. TLS is a protocol that has been standardized a few years ago [TLS2246]. Despite its rather recent standardization, TLS has its roots in secure socket layer (SSL) used for a long time for e-commerce. SSL was designed by Netscape to support Internet shopping. Prior to SSL, the user needed to register with a website and then receive a password through the mail later on. Using SSL, the website could prove its legitimacy by sending out a certificate issued by a CA to the user. If the user decided that it could trust the certificate, she could type her credit card number on the web interface and complete her shopping. Even though TLS gets its fundamentals from SSL, at this point SSL and TLS do not directly interoperate. As shown in Figure 4.11, TLS is designed to run on top of a reliable transport such as TCP and therefore is specially suited for application protocols that run over TCP. Examples are HTTP, TELNET, FTP, and SMTP (simple mail transfer protocol). TLS is an asymmetric client server protocol, which means in general the server authenticates itself to the client using a server certificate, while client is not always required to present a certificate. This was of course done to promote the spirit of impulse buying. Otherwise, by the time the user realized she had to register with a CA to have her own digital ID and certificate she may have either changed her mind or simply did not know how to proceed. Despite all our sarcasm, mutual authentication based on certificates for both client and server is supported in TLS, when so is required. This will eliminate the need for shared key configurations. Besides providing security at transport layer and avoiding the problems associated with IP layer security, TLS has another attractive feature: TLS handles its own key exchange negotiations in protected manner and without requiring another key exchange protocol (as IPsec does with IKE). TLS handles the trust relationship establishment and security provisioning based on its two layers:
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The TLS handshake protocol uses public key cryptography for authentication, cipher suite negotiation, and key exchange to establish a secure channel. TLS record protocol carries the actual session data in a secure fashion, using the symmetric keys created during the handshake stage. The data are encrypted as well integrity protected
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