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9: Authentication and Remote Access
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Figure 9-3 PPTP communication diagram
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any method Common in hotels today are wired connections to the Internet These wired connections to the hotel provided local ISP replaces the phone connection and offers the same services, albeit at a much higher data transfer rate As mentioned earlier in this chapter, tunneling is the process of sending packets as data within other packets across a section of a network This encapsulation enables a network to carry a packet type that it cannot ordinarily route, and it also provides the opportunity to secure the contents of the first packet through encryption PPTP establishes a tunnel from the remote PPTP client to the PPTP server and enables encryption within this tunnel This provides a secure method of transport To do this and still enable routing, an intermediate addressing scheme, Generic Routing Encapsulation (GRE), is used
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Figure 9-4 PPTP message encapsulation during transmission
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To establish the connection, PPTP uses communications across TCP port 1723 (see Table 9-1 in the Review section), so this port must remain open across the network firewalls for PPTP to be initiated Although PPTP allows the use of any PPP authentication scheme, CHAP is used when encryption is specified to provide an appropriate level of security For the encryption methodology, Microsoft chose the RSA RC4 cipher, either with a 40-bit or 128-bit session key length, and this is operatingsystem driven Microsoft Point-to-Point Encryption (MPPE) is an extension to PPP that enables VPNs to use PPTP as the tunneling protocol
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PPP is a commonly used data link protocol to connect devices Defined in RFC 1661, PPP originally was created as an encapsulation protocol to carry IP traffic over point-topoint links PPP has been extended upon with multiple RFCs to carry a variety of network traffic types over a variety of network types PPP uses Link Control Protocols (LCP) and Network Control Protocols (NCP) to establish the desired connections over a network EXAM TIP PPP supports three functions: 1) Encapsulate datagrams across serial links; 2) Establish, configure, and test links using LCP; and 3) Establish and configure different network protocols using NCP PPP supports two authentication protocols: Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP)
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CHAP is used to provide authentication across a point-to-point link using PPP In this protocol, authentication after the link has been established is not mandatory CHAP is designed to provide authentication periodically through the use of a challenge/response system sometimes described as a three-way handshake, as illustrated in Figure 9-5 The initial challenge (a randomly generated number) is sent to the client The client uses a one-way hashing function to calculate what the response should be and then sends this back The server compares the response to what it calculated the response should be If they match, communication continues If the two values don t match, then the connec-
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Figure 9-5 The CHAP challenge/response sequence
9: Authentication and Remote Access
tion is terminated This mechanism relies on a shared secret between the two entities so that the correct values can be calculated Microsoft has created two versions of CHAP, modified to increase their usability across their product line MSCHAPv1, defined in RFC 2433, has been deprecated and dropped in Windows Vista The current standard version 2, RFC 2759, was introduced with Windows 2000
PAP authentication involves a two-way handshake in which the username and password are sent across the link in clear text PAP authentication does not provide any protection against playback and line sniffing PAP is now a deprecated standard PART III
EAP is a universal authentication framework defined by RFC 3748 that is frequently used in wireless networks and point-to-point connections Although EAP is not limited to wireless and can be used for wired authentication, it is most often used in wireless LANs EAP is discussed in 10
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