![]() All rights not explicitly granted are reserved. Security Internals acknowledges Matthew Conover for technical editing of this paper.Ĭopyright (c) 2002, Security Internals, Inc. Some code samples are pseudo code and will not compile. The use of the C programming language will be used to illustrate code algorithms. This includes Windows NT(r), Windows 2000(r), and most recently, Windows XP(r). Vulnerabilities will be explored as well as areas in which vulnerabilitiesĪll references to Microsoft(r) Windows(r) software is in reference to the operating systems built on NT technology. This paper will present a common terminology and define the intricacies ofĭiscovering and exploiting these security flaws. In fact, there isn't even a common terminology to define these security flaws. Technicalities involved in their discovery are widely unknown and undocumented. Sommerlad, Security Patterns: Integrating security and systems engineering, West Sussex, England: John Wiley & Sons 2006.Several named pipe security flaws have been discovered in recent years. of the 8th Annual Conference on Pattern Languages of Programs (PLoP 2001), 11-15 September 2001, Allerton Park Monticello, Illinois, USA, 2001. Pan,“ A Pattern Language for security models”, Procs. Pattern-Oriented Software Architecture: A System of Patterns, Volume 1, West Sussex, England: John Wiley & Sons, 1996. ![]() The general performance of the system worsens due to the overhead of the security checks.Applying this pattern imposes the following liabilities: The Administrator role controls the reconfiguration of stages.The use of encryption between stages is possible, adding the possibilities of secure messages and digital signatures.The use of operations over the data, is now restricted with the implementation of either RBAC or Access Matrix models. The system assigns privileges according to each stage of processing.Known Uses XML Pipeline Definition Language (XPL) Role-Based Trust-Management Markup Language (RTML) xoRBAC SeMoAĬonsequences The use of this pattern yields to the following benefits: Solution Authentication Information Authentication Information 1 1 check check 1 1 Right Filter j Filter i Right Right Pipeline i op1 op1 op2 op3 op1 op2 op1 op2 op1 op2 Right configure « role » Role1 « role » Role2 « role » Role3 « role » Role4 Class Diagramĭynamics :Subject :RefMonitor :Right :Filter i :Data Source :Data Sink request_op1 checkRights decision decision request_op1 read data op1 write data Sequence DiagramĮxample Resolved Authentication Information Authentication Information 1 1 check check 1 1 Document Creation Pipeline i Document Registration read addTemplate write read write sign Right Right Right Right configure read write sign read read addTemplate write « role » Administrator « role » Principal Lawyer « role » Assistant Lawyer « role » Secretary Class Diagram In the figure below we can observe one approach to add security, implementing RBAC. The exchange of information between stages is secured. Solution The Secure Pipes and filters pattern provides a secure way to divide the processing of data to different sequential stages or steps. The right to reconfigure the stages within the data flow must be controlled.We might require using signatures or authentication between stages.The system needs to assign privileges according to each stage of processing and roles involved.The information can go in either direction in the system.Problem The design of the system has to consider the following forces: In the example above a new lawyer may be assigned to the case, but the responsibilities and privileges should remain intact. In this kind of system, we may need the flexibility to reorder the steps of the process or change the processing steps. In the previous example the secretary can create the legal document, but privileges such as inserting legal advisory or signing the document are restricted to her level. Every time the data reach a different stage, exclusive functions are applied. Problem Different stages are needed before data reaches the final stage, this happens for several reasons: every component performs specialized functions over the data, the global architecture or hierarchical organization requires this flow and this approach makes the system more flexible. The rights to perform the filtering and the movement of data are controlled.Ĭontext Processing data streams in different stages, with different levels of responsibility and rights, used to control who can perform data transformations. Each processing step applies some data transformation or filtering. Intro The Secure Pipes and Filters pattern provides secure handling of data streams. Pre requisites Pipes & Filters: Provides a structure for system that process a stream of data RBAC: Assign rights to users according to their roles in an institution.
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