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VPNs are secure virtual networks built on top of physical networks Their security lies in the encryption of packet contents between the endpoints that define the VPN network The physical network upon which a VPN is built is typically a public network, such as the Internet Because the packet contents between VPN endpoints are encrypted, to an outside observer on the public network, the communication is secure, and depending on how the VPN is set up, security can even extend to the two communicating parties machines Virtual private networking is not a protocol per se, but rather a method of using protocols to achieve a specific objective secure communications as shown in Figure 9-6 A user wanting to have a secure communication channel with a server across a public network can set up two intermediary devices, VPN endpoints, to accomplish this task The user can communicate with his endpoint, and the server can communicate with its endpoint The two endpoints then communicate across the public network VPN endpoints can be software solutions, routers, or specific servers set up for specific functionality This implies that VPN services are set up in advance and are not something negotiated on the fly A typical use of VPN services is a user accessing a corporate data network from a home PC across the Internet The employee will install VPN software from work on a home PC This software is already configured to communicate with the corporate network s VPN endpoint; it knows the location, the protocols that will be used, and so on When the home user wants to connect to the corporate network, she connects to the Internet and then starts the VPN software The user can then log in to the corporate network by using an appropriate authentication and authorization methodology The
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9: Authentication and Remote Access
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PART III
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Figure 9-6 VPN service over an Internet connection
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sole purpose of the VPN connection is to provide a private connection between the machines, which encrypts any data sent between the home user s PC to the corporate network Identification, authorization, and all other standard functions are accomplished with the standard mechanisms for the established system VPNs can use many different protocols to offer a secure method of communicating between endpoints Common methods of encryption on VPNs include PPTP, IPsec, SSH, and L2TP, all of which are discussed in this chapter The key is that both endpoints know the protocol and share a secret All of this necessary information is established when the VPN is set up At the time of use, the VPN only acts as a private tunnel between the two points and does not constitute a complete security solution
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IPsec
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IPsec is a set of protocols developed by the IETF to securely exchange packets at the network layer (layer 3) of the OSI model (RFC 2401 2412) Although these protocols work only in conjunction with IP networks, once an IPsec connection is established, it is possible to tunnel across other networks at lower levels of the OSI model The set of security services provided by IPsec occurs at the network layer of the OSI model, so higher layer protocols, such as TCP, UDP, Internet Control Message Protocol (ICMP), Border Gateway Protocol (BGP), and the like, are not functionally altered by the implementation of IPsec services The IPsec protocol series has a sweeping array of services it is designed to provide, including but not limited to access control, connectionless integrity, traffic-flow confidentiality, rejection of replayed packets, data security (encryption), and data-origin authentication IPsec has two defined methods transport and tunneling that provide different levels of security IPsec also has three modes of connection: host-to-server, server-to-server, and host-to-host
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CompTIA Security+ All-in-One Exam Guide
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The transport method encrypts only the data portion of a packet, thus enabling an outsider to see source and destination IP addresses The transport method protects the higher level protocols associated with a packet and protects the data being transmitted but allows knowledge of the transmission itself Protection of the data portion of a packet is referred to as content protection Tunneling provides encryption of source and destination IP addresses, as well as of the data itself This provides the greatest security, but it can be done only between IPsec servers (or routers) because the final destination needs to be known for delivery Protection of the header information is known as context protection EXAM TIP In transport mode (end-to-end), security of packet traffic is provided by the endpoint computers In tunnel mode (portal-to-portal), security of packet traffic is provided between endpoint node machines in each network and not at the terminal host machines It is possible to use both methods at the same time, such as using transport within one s own network to reach an IPsec server, which then tunnels to the target server s network, connecting to an IPsec server there, and then using the transport method from the target network s IPsec server to the target host
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