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Preventing information inference in access control 15

Preventing information inference in access control

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Paci, Federica Zannone, Nicola University of Southampton United Kingdom Eindhoven University of Technology Netherlands

ISBN: (纸本)9781450335560

Technological innovations like social networks, personal devices and cloud computing, allow users to share and store online a huge amount of personal data. Sharing personal data online raises significant privacy concerns for users, who feel that they do not have full control over their data. A solution often proposed to alleviate users' privacy concerns is to let them specify access control policies that reflect their privacy constraints. However, existing approaches to access control often produce policies which either are too restrictive or allow the leakage of sensitive information. In this paper, we present a novel access control model that reduces the risk of information leakage. The model relies on a data model which encodes the domain knowledge along with the semantic relations between data. We illustrate how the access control model and the reasoning over the data model can be automatically translated in XacmL. We evaluate and compare our model with existing access control models with respect to its effectiveness in preventing leakage of sensitive information and efficiency in authoring policies. The evaluation shows that the proposed model allows the definition of effective access control policies that mitigate the risks of inference of sensitive data while reducing users' effort in policy authoring compared to existing models. © Copyright 2015 acm.

关键词： Semantics

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Relationship-based access control for an open-source medical records system 15

Relationship-based access control for an open-source medical...

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Rizvi, Syed Zain R. Fong, Philip W.L. Crampton, Jason Sellwood, James University of Calgary AB Canada Royal Holloway University of London Egham United Kingdom

ISBN: (纸本)9781450335560

Inspired by the access control models of social network systems, Relationship-Based access control (ReBAC) was recently proposed as a general-purpose access control paradigm for application domains in which authorization must take into account the relationship between the access requestor and the resource owner. The healthcare domain is envisioned to be an archetypical application domain in which ReBAC is sorely needed: e.g., my patient record should be accessible only by my family doctor, but not by all doctors. In this work, we demonstrate for the first time that ReBAC can be incorporated into a production-scale medical records system, OpenMRS, with backward compatibility to the legacy RBAC mechanism. Specifically, we extend the access control mechanism of OpenMRS to enforce ReBAC policies. Our extensions incorporate and extend advanced ReBAC features recently proposed by Crampton and Sellwood. In addition, we designed and implemented the first administrative model for ReBAC. In this paper, we describe our ReBAC implementation, discuss the system engineering lessons learnt as a result, and evaluate the experimental work we have undertaken. In particular, we compare the performance of the various authorization schemes we implemented, thereby demonstrating the feasibility of ReBAC. © Copyright 2015 acm.

关键词： Authorization

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SacmAT 2014 - proceedings of the 19th acm symposium on access control models and technologies

SACMAT 2014 - Proceedings of the 19th ACM Symposium on Acces...

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19th acm symposium on access control models and technologies, SacmAT 2014

ISBN: (纸本)9781450329392

The proceedings contain 22 papers. The topics discussed include: hardware-enhanced distributed access enforcement for role-based access control;an access control concept for novel automotive HMI systems;monitor placement for large-scale systems;anomaly detection and visualization in generative RBAC models;reduction of access control decisions;towards more usable information flow policies for contemporary operating systems;attribute based access control for APIs in spring security;comprehensive integrity protection for desktop Linux;game theoretic analysis of multiparty access control in online social networks;scalable and precise automated analysis of administrative temporal role-based access control;access control models for geo-social computing systems;limiting access to unintentionally leaked sensitive documents using malware signatures;and user-centric identity as a service-architecture for eIDs with selective attribute disclosure.

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Federated access management for collaborative network environments: Framework and case study 15

Federated access management for collaborative network enviro...

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Rubio-Medrano, Carlos E. Zhao, Ziming Doupé, Adam Ahn, Gail-Joon Arizona State University TempeAZ United States

ISBN: (纸本)9781450335560

With the advent of various collaborative sharing mechanisms such as Grids, P2P and Clouds, organizations including private and public sectors have recognized the benefits of being involved in inter-organizational, multi-disciplinary, and collaborative projects that may require diverse resources to be shared among participants. In particular, an environment that often makes use of a group of high-performance network facilities would involve large-scale collaborative projects and tremendously seek a robust and flexible access control for allowing collaborators to leverage and consume resources, e.g., computing power and bandwidth. In this paper, we propose a federated access management scheme that leverages the notion of attributes. Our approach allows resource-sharing organizations to provide distributed provisioning (publication, location, communication, and evaluation) of both attributes and policies for federated access management purposes. Also, we provide a proof-of-concept implementation that leverages distributed hash tables (DHT) to traverse chains of attributes and effectively handle the federated access management requirements devised for inter-organizational resource sharing and collaborations. © Copyright 2015 acm.

关键词： access control

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Mitigating access control vulnerabilities through interactive static analysis 15

Mitigating access control vulnerabilities through interactiv...

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Zhu, Jun Chu, Bill Lipford, Heather Thomas, Tyler University of North Carolina at Charlotte CharlotteNC28223 United States

ISBN: (纸本)9781450335560

access control vulnerabilities due to programming errors have consistently ranked amongst top software vulnerabilities. Previous research efforts have concentrated on using automatic program analysis techniques to detect access control vulnerabilities in applications. We report a comparative study of six open source PHP applications, and find that implicit assumptions of previous research techniques can significantly limit their effectiveness. We propose a more effective hybrid approach to mitigate access control vulnerabilities. Developers are reminded in-situ of potential access control vulnerabilities, where self-review of code can help them discover mistakes. Additionally, developers are prompted for application-specific access control knowledge, providing samples of code that could be thought of as static analysis by example. These examples are turned into code patterns that can be used in performing static analysis to detect additional access control vulnerabilities and alert the developer to take corrective actions. Our evaluation of six open source applications detected 20 zero-day access control vulnerabilities in addition to finding all access control vulnerabilities detected in previous works. © Copyright 2015 acm.

关键词： access control

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On missing attributes in access control: Non-deterministic and probabilistic attribute retrieval 15

On missing attributes in access control: Non-deterministic a...

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Crampton, Jason Morisset, Charles Zannone, Nicola Royal Holloway University of London United Kingdom Newcastle University United Kingdom Eindhoven University of Technology Netherlands

ISBN: (纸本)9781450335560

Attribute Based access control (ABAC) is becoming the reference model for the specification and evaluation of access control policies. In ABAC policies and access requests are defined in terms of pairs attribute names/values. The applicability of an ABAC policy to a request is determined by matching the attributes in the request with the attributes in the policy. Some languages supporting ABAC, such as PTaCL or XacmL 3.0, take into account the possibility that some attributes values might not be correctly retrieved when the request is evaluated, and use complex decisions, usually describing all possible evaluation outcomes, to account for missing attributes. In this paper, we argue that the problem of missing attributes in ABAC can be seen as a non-deterministic attribute retrieval process, and we show that the current evaluation mechanism in PTaCL or XacmL can return a complex decision that does not necessarily match with the actual possible outcomes. This, however, is problematic for the enforcing mechanism, which needs to resolve the complex decision into a conclusive one. We propose a new evaluation mechanism, explicitly based on non-deterministic attribute retrieval for a given request. We extend this mechanism to probabilistic attribute retrieval and implement a probabilistic policy evaluation mechanism for PTaCL in PRISM, a probabilistic model-checker. © Copyright 2015 acm.

关键词： access control

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Mohawk+T: Efficient analysis of administrative temporal role-based access control (ATRBAC) policies 15

Mohawk+T: Efficient analysis of administrative temporal role...

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Shahen, Jonathan Niu, Jianwei Tripunitara, Mahesh University of Waterloo Canada University of Texas San Antonio United States

ISBN: (纸本)9781450335560

Safety analysis is recognized as a fundamental problem in access control. It has been studied for various access control schemes in the literature. Recent work has proposed an administrative model for Temporal Role-Based access control (TRBAC) policies called Administrative TRBAC (ATRBAC). We address ATRBAC-safety. We first identify that the problem is PSPACE-complete. This is a much tighter identification of the computational complexity of the problem than prior work, which shows only that the problem is decidable. With this result as the basis, we propose an approach that leverages an existing open-source software tool called Mohawk to address ATRBAC-safety. Our approach is to efficiently reduce ATRBAC-safety to ARBAC-safety, and then use Mohawk. We have conducted a thorough empirical assessment. In the course of our assessment, we came up with a "reduction toolkit," which allows us to reduce Mohawk+T input instances to instances that existing tools support. Our results suggest that there are some input classes for which Mohawk+T outperforms existing tools, and others for which existing tools outperform Mohawk+T. The source code for Mohawk+T is available for public download. © Copyright 2015 acm.

关键词： Open source software

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Towards an automatic top-down role engineering approach using natural language processing techniques 15

Towards an automatic top-down role engineering approach usin...

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Narouei, Masoud Takabi, Hassan Department of Computer Science and Engineering University of North Texas DentonTX United States

ISBN: (纸本)9781450335560

Role Based access control (RBAC) is the most widely used model for access control due to the ease of administration as well as economic benefits it provides. In order to deploy an RBAC system, one requires to first identify a complete set of roles. This process, known as role engineering, has been identified as one of the costliest tasks in migrating to RBAC. In this paper, we propose a top-down role engineering approach and take the first steps towards using natural language processing techniques to extract policies from unrestricted natural language documents. Most organizations have high-level requirement specifications that include a set of access control policies which describes allowable operations for the system. However, it is very time consuming, labor-intensive, and error-prone to manually sift through these natural language documents to identify and extract access control policies. Our goal is to automate this process to reduce manual efforts and human errors. We apply natural language processing techniques, more specifically semantic role labeling to automatically extract access control policies from unrestricted natural language documents, define roles, and build an RBAC model. Our preliminary results are promising and by applying semantic role labeling to automatically identify predicate-argument structure, and a set of predefined rules on the extracted arguments, we were able correctly identify access control policies with a precision of 75%, recall of 88%, and F1 score of 80%. © Copyright 2015 acm.

关键词： access control

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A logic of trust for reasoning about delegation and revocation 15

A logic of trust for reasoning about delegation and revocati...

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Cramer, Marcos Ambrossio, Diego Agustín Van Hertum, Pieter University of Luxembourg Luxembourg KU Leuven Belgium

ISBN: (纸本)9781450335560

In ownership-based access control frameworks with the possibility of delegating permissions and administrative rights, chains of delegated accesses will form. There are different ways to treat these delegation chains when revoking rights, which give rise to different revocation schemes. Hagström et al. [8] proposed a framework for classifying revocation schemes, in which the different revocation schemes are defined graph-theoretically;they motivate the revocation schemes in this framework by presenting various scenarios in which the agents have different reasons for revocating. This paper is based on the observation that there are some problems with Hagström et al.'s definitions of the revocation schemes, which have led us to propose a refined framework with new graph-theoretic definitions of the revocation schemes. In order to formally study the merits and demerits of various definitions of revocation schemes, we propose to apply the axiomatic method originating in social choice theory to revocation schemes. For formulating an axiom, i.e. a desirable property of revocation frameworks, we propose a logic, Trust Delegation Logic (TDL), with which one can formalize the different reasons an agent may have for performing a revocation. We show that our refined graph-theoretic definitions of the revocation schemes, unlike Hagström et al.'s original definitions, satisfy the desirable property that can be formulated using TDL.

关键词： access control

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Towards a general framework for optimal role mining: A constraint satisfaction approach 15

Towards a general framework for optimal role mining: A const...

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20th acm symposium on access control models and technologies, SacmAT 2015

作者： Jafarian, Jafar Haadi Takabi, Hassan Touati, Hakim Hesamifard, Ehsan Shehab, Mohamed Department of Software and Information Systems University of North Carolina at Charlotte CharlotteNC United States Department of Computer Science and Engineering University of North Texas DentonTX United States

ISBN: (纸本)9781450335560

Role Based access control (RBAC) is the most widely used advanced access control model deployed in a variety of organizations. To deploy an RBAC system, one needs to first identify a complete set of roles, including permission role assignments and role user assignments. This process, known as role engineering, has been identified as one of the costliest tasks in migrating to RBAC. Since many organizations already have some form of user permission assignments defined, it makes sense to identify roles from this existing information. This process, known as role mining, has gained significant interest in recent years and numerous role mining techniques have been developed that take into account the characteristics of the core RBAC model, as well as its various extended features and each is based on a specific optimization metric. In this paper, we propose a generic approach which transforms the role mining problem into a constraint satisfaction problem. The transformation allows us to discover the optimal RBAC state based on customized optimization metrics. We also extend the RBAC model to include more context-aware and application specific constraints. These extensions broaden the applicability of the model beyond the classic role mining to include features such as permission usage, hierarchical role mining, hybrid role engineering approaches, and temporal RBAC models. We also perform experiments to show applicability and effectiveness of the proposed approach. © Copyright 2015 acm.

关键词： access control

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