ARC BRIEF. Software-defined Industrial Networks Deliver Cybersecurity Breakthroughs. Keywords. Summary. By Harry Forbes
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1 ARC BRIEF JUNE 8, 2017 Software-defined Industrial Networks Deliver Cybersecurity Breakthroughs By Harry Forbes Keywords Critical Infrastructure, Cybersecurity, OpenFlow, SDN, Security, SEL, Software-defined Networks, Tempered Networks Summary Cost-effective cybersecurity remains a pain point and challenge for industrial control system installations. The more critical the plant or infrastructure operated by a control system, the greater resources and attention are lavished on its cybersecurity. Likewise, Two technologies of software-defined cybersecurity is often cited as the leading barrier to networking (SDN) that have recently growth of the Industrial Internet of Things (IIoT). been applied in actual industrial control Unfortunately, there has been little fundamental systems are quite promising in that they improvement in the nature of internet protocol (IP) may deliver substantial improvements in the cybersecurity of both new and communication. The protocols for internet and existing industrial control systems. industrial IP communication were established in the 1980s and 1990s. Therefore, most industrial cybersecurity technologies and products today adopt the strategy of guarding the perimeter of a vulnerable intranet, beginning with the firewalls first developed in the late 1980s. Two quite promising software-defined networking (SDN) technologies recently applied in industrial control systems may deliver substantial improvements in the cybersecurity of both new and existing industrial control systems. The first of these techniques uses an SDN protocol, OpenFlow, to manage a network. The second uses Host Identity Protocol (HIP, RFC 7401) to create and manage a secure identity-based overlay network that serves the automation components and cloaks these from general visibility. Both SDN techniques have already been employed in actual industrial installations and products have been released to the industrial market using both SDN techniques. Either might well be the most promising forward step for industrial cybersecurity since the invention of the firewall. VISION, EXPERIENCE, ANSWERS FOR INDUSTRY
2 ARC Brief, Page 2 Network Lockdown Using OpenFlow The first technique uses the OpenFlow protocol to lock down an industrial network. OpenFlow is a single protocol that replaces the plethora of existing routing and access protocols embedded in Ethernet switches. In an OpenFlow installation, the packet forwarding rules for an entire network of switches are managed from a central SDN controller. This separation of network control from packet forwarding enables more sophisticated and dynamic traffic management. Cognoscenti refer to this property as the separation of the control plane from the data plane (see figure). The OpenFlow protocol has typically been used in large enterprise networks (for example, Google uses OpenFlow internally) and in large data centers, where OpenFlow is used to improve performance, especially as data center loadings change from hour to hour. Traditional Networking vs. Software-defined Networking (Source: software-defined.net) However, in industrial applications, practitioners report to ARC that the same protocol can be used as an effective way to lock down a (much smaller) industrial network or even part of an industrial network. The packet forwarding rules can be clearly specified and packets that do not match the rules can be forwarded directly to the network controller. The network controller is thus immediately aware of any abnormal network traffic and can restrict the network to forwarding only known packet types along predefined routes. In many cases this is a very suitable security solution for
3 ARC Brief, Page 3 industrial automation networks, since their traffic often consists of a welldefined set of packet types and routes. The first product example of OpenFlow as an industrial network security technique comes from Schweitzer Engineering Laboratories (SEL), a firm well known for intelligent protective relays, substation automation equipment, and infrastructure for electric power transmission and distribution. In late 2016, SEL introduced an OpenFlow-based flow controller and an SDN configuration for some models of its industrial Ethernet switches, which are typically used in electric power substation automation. The network traffic within a substation consists of a relatively small number of message types and a small number of redundant network paths. The flow controller assigns rules to the network switches that enforce the desired path redundancies and require that all non-conforming packets be forwarded immediately to the network controller. SEL Uses SDN to Lock Down Network Traffic in Substations (Source: Schweitzer Engineering Laboratories) The network controller can also dynamically create rules that enable engineering access to the automation equipment and the protective relays located in the substation. Engineers report that the biggest advantage of their SDN network is the ability to lock down the substation network and immediately become aware of any packets entering the network that do not match the expected packet types and routes. Major substations and other electric power T&D infrastructure are highvalue targets for cyber warfare. They are critical for power system operation, so improvements in the overall security of networks within electric power substations represent an important security advance in the electric power T&D industry. A second similar industrial example of OpenFlow has been announced by Yokogawa for several paper mills in Japan owned by the Oji Group. In this
4 ARC Brief, Page 4 case, the networks secured were those linking the enterprise with the mills. These enterprise-to-plant paths can represent a significant risk, in that any compromise of the enterprise network may provide access to the process control networks within each paper mill. The general practice in industry is to provide extensive firewalls and other defenses to secure the plant networks so that traffic from the enterprise to the plant is extremely limited. This provides a high degree of security, but the restrictions imposed can cause difficulties for legitimate enterprise applications and for remote support of the plant manufacturing operations. They also require significant technical expertise to deploy and maintain. HIP Decouples IP Addresses from IP Communication The third example of enhanced industrial network security uses a very different strategy, based on Host Identity Protocol (HIP), which is a more radical departure. While its objectives are similar to existing SDN technologies, this approach does not require changes to the underlying IP network. With typical SDN solutions, the control plane configures the underlay network, which is not the case in this approach. In fact, this strategy represents a break from decades of IP networking practice. The fundamental idea is to decouple the IP address from packet forwarding rules. Instead, network services are authorized and delivered based on provable cryptographic identities. HIP also introduces a new Host Identity Namespace that is forward and backward compatible with existing IP and DNS Namespaces and enables global IP mobility. It enables organizations to overcome IP addressing issues and conflicts and move an IP resource, whether static or dynamic, within and between physical, virtual, or cloud networks without having to change the IP or overlay network policies. The early days of the domain name system applications could reach virtually any point in the global Internet by using its domain name or its IP address. While this property of universal accessibility was very handy for applications such as web browsing, the ability to reach any point in a network is not necessarily an asset in industrial automation and is certainly not an asset in terms of industrial network security. In place of using IP addresses as identity, Host Identity Protocol establishes secure identities among sets of devices. This lets the IP address continue to serve its original purpose; as a locator only. The network HIP-enabled switches (which are all in a set of secure identified devices) provide services
5 ARC Brief, Page 5 based on these identities rather than IP addresses. The overlay network traffic flows as encrypted IP payloads over the existing IP network. What is an overlay network? The first historical examples date from the 1990s when the World Wide Web and its network traffic volume exploded. To maintain Internet performance, network operators developed overlay networks (now called Content Delivery Networks, or CDNs). These CDNs provided local proxy services in multiple locations, so that the overall point-to-point performance of internet websites remained acceptable to users regardless of their location. The overlay network they formed was invisible to casual web users. The firm Akamai grew out of this application and remains a leader in the field of CDNs. HIP Enables Creation of Secure Overlay Network Communication (Source: Tempered Networks) A secure overlay network, on the other hand, is not used to improve network performance but to deliver enhanced network security. The overlay network uses secure host identities rather than IP addressing to route packets on the overlay network. Secure identities takes the place of normal IP addressing for packet forwarding, though the overlay traffic is encapsulated in IP datagrams. Security is provided for the overlay network via HIP. Only devices possessing secure identities may join the overlay. The interesting part of this application is that it allows the network infrastructure to protect existing edge devices without any need to upgrade them. The network infrastructure can whitelist services for the end de-
6 ARC Brief, Page 6 vices directly connected to it. These devices can One useful feature of this overlay continue to use their IP addressing but be permitted to join the overlay network, though remaining network strategy is that it can cloak industrial control system equipment unaware of it. They communicate with the new making this equipment invisible and smarter infrastructure, which passes their IP traffic unreachable except via the secure via the secure overlay network. Because the solution operates as a software overlay, the network identity-based overlay network. will be more agile enabling changes to be made faster while maintaining security. One very large manufacturer in the US (that requests anonymity) now uses this HIP strategy extensively in its largest plant, using equipment provided by venture firm Tempered Networks. One useful feature of this network strategy is that it can make industrial control system equipment invisible and unreachable except via the secure overlay network. It also enables segregation of control and information traffic. It enhances network security by limiting the freedom of packet flow on the network. The rules that define permissible network routes within the secure overlay network, and the rules defining the treatment of legacy IP end devices are highly flexible and can be managed from a centralized orchestration console. Another benefit of a network based on secure identity is easier support for device/machine mobility and remote access. By extending the identitybased overlay network to mobile devices and remote locations, in-plant mobility and remote servicing can be accommodated without deploying VPNs. This could alleviate the difficulties end users experience in both these areas. Both of these SDN technologies violate the old Internet networking model of smart end devices and dumb network pipes. But that network model dates from the early days of the internet and is outdated in this era of the IIoT. Furthermore, the old Internet communication model of ubiquitous access is not well suited for critical infrastructure or industrial control systems. These do not need ubiquitous connectivity. Rather, they require higher levels of security and higher qualities of service. In this era of industrial cyber threats (and for these applications) both SDN techniques are excellent fits and they represent substantial improvement over what is typically installed in plant networks today. Critical infrastructure protection is a hugely important global concern. Here we have seen
7 ARC Brief, Page 7 two ways in which forward-thinking suppliers are delivering greater security for critical infrastructure, and doing it today. Perhaps the largest advantage these technologies offer is that the industrial end devices (I/O systems, IEDs, PLCs, etc.) do not need to be upgraded to support the new cyber-secure network capabilities. Rather than upgrade the entire installed complement of industrial end devices (literally impossible in most plants) the network infrastructure can be upgraded instead to deliver higher levels of security. Automation suppliers and industrial infrastructure suppliers can move their offerings in these directions now. The underlying technology is available. Why haven't all such suppliers done this already? End users should be asking their incumbent automation and network infrastructure suppliers what design choices they are making and when they will be delivering such new SDN technologies, which are providing enhanced industrial cybersecurity and network manageability in real industrial applications, and doing it today. ARC Recommendations Manufacturers and utilities should develop use cases leading to broader plans for how SDN could improve the cybersecurity, mobility support, and remote access services of their existing plants. Manufacturers and utilities should become familiar with the SDN roadmaps of their incumbent and alternative network infrastructure suppliers, and apply these roadmaps to their own SDN use cases. Automation suppliers and industrial network suppliers should carefully evaluate SDN technologies and their potential impact on both cybersecurity and performance. These should be evaluated as existing (though evolving) technologies. This paper was written by ARC Advisory Group on behalf of Tempered Networks. The opinions and observations stated are those of ARC Advisory Group. For further information or to provide feedback on this paper, please contact the author at HForbes@arcweb.com ARC Briefs are published and copyrighted by ARC Advisory Group. The information is proprietary to ARC and no part of it may be reproduced without prior permission from ARC Advisory Group.
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