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CHAPTER
Security Patterns
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Most interesting of all, however, is the lesson that the bulk of computer security research and development activity is expended on activities which are of marginal relevance to real needs. A paradigm shift is underway, and a number of recent threads point towards a fusion of security with software engineering, or at the very least to an influx of software engineering ideas. Ross Anderson, in Why Cryptosystems Fail
In this chapter we explain the concept of security patterns and our approach to them in the book. The security patterns discussion builds on the security introduction in this chapter and on our general patterns introduction. We discuss foundations of security patterns in terms of history, pattern structure, and motivation. We also discuss sources of knowledge for security patterns in terms of mining for security patterns. Finally, we present running examples that appeared to be useful in some patterns in the book.
3
Security Patterns
3.1 The History of Security Patterns
Yoder and Barcalow wrote the first paper on security patterns [YB97]. They included a variety of patterns useful in different aspects of security. Yoder and Barcalow used the GoF template to describe security aspects and to structure their patterns as a pattern language. Before them, at least three papers [FP01] [FWF94] [Ess97] had shown object-oriented models of secure systems without calling them patterns or using one of the standard pattern templates. In the following year, 1998, two more pattern contributions were published: a pattern language for cryptography [BRD98], and a pattern for access control [NG98]. Several others have appeared subsequently, and we have now a substantial collection, a good number of which appear in this book. It is more convenient to show these patterns according to the architectural levels to which they belong than to classify them chronologically:
At the abstract level we have patterns that describe security models, including [FP01], patterns for access matrix authorization, ROLE-BASED ACCESS CONTROL (249) (RBAC), and multi-level models, and [Wel99], a pattern for the Clark-Wilson model. A simpler pattern for RBAC appears in [YB97]. Some patterns deal with abstract models of enforcement and include SINGLE ACCESS POINT (279) [YB97], CHECK POINT (287), a type of REFERENCE MONITOR (256), [YB97], and REFERENCE MONITOR (256) [Fer02]. One possible implementation of REFERENCE MONITOR (256) is the INTERCEPTOR pattern in [POSA2]. An implementation model of RBAC in the form of a set of patterns is shown in [KBZ01]. Capabilities are a good way to implement access matrix rights at the hardware and operating system level. Their application to control access to classes is described in [Fra99]. The use of metaclasses and reflection is another interesting way to implement these models at such levels [Wel99]. Several security patterns for Java appear in [Jaw00]. An implementation of RBAC using Java is described in [Giu99]. Patterns for operating systems were developed in [Fer02] and [FS03]. These include CONTROLLED OBJECT FACTORY (331), CONTROLLED OBJECT MONITOR (335), AUTHENTICATOR (323), VIRTUAL ADDRESS SPACE, CONTROLLED EXECUTION ENVIRONMENT (346), and REFERENCE MONITOR (256). These contributions have been merged for this book. Patterns for firewalls are discussed in [FLS+03c] and [Sch03]. These include packet filter and proxy-based firewalls. These two papers have been updated, extended, and merged in this book. Pattern languages for cryptography are described in [BRD98] and [LP01]. Patterns for distributed systems include BODYGUARD [NG98], a framework for access control and filtering of distributed objects, which combines several