There are a number of standard activities that will greatly assist with the compliance process. This chapter outlines some of the most common compliance activities. These are not specific to OpenStack, however references are provided to relevant sections in this book as useful context.
An Information Security Management System (ISMS) is a comprehensive set of policies and processes that an organization creates and maintains to manage risk to information assets. The most common ISMS for cloud deployments is ISO/IEC 27001/2, which creates a solid foundation of security controls and practices for achieving more stringent compliance certifications. This standard was updated in 2013 to reflect the growing use of cloud services and places more emphasis on measuring and evaluating how well an organization’s ISMS is performing.
A risk assessment framework identifies risks within an organization or service, and specifies ownership of these risks, along with implementation and mitigation strategies. Risks apply to all areas of the service, from technical controls to environmental disaster scenarios and human elements. For example, a malicious insider. Risks can be rated using a variety of mechanisms. For example, likelihood versus impact. An OpenStack deployment risk assessment can include control gaps.
Periodic access and log reviews are required to ensure authentication, authorization, and accountability in a service deployment. Specific guidance for OpenStack on these topics are discussed in-depth in Monitoring and logging.
The OpenStack Identity service supports Cloud Auditing Data Federation (CADF) notification, providing auditing data for compliance with security, operational, and business processes. For more information, see the Keystone developer documentation.
Disaster Recovery (DR) and Business Continuity Planning (BCP) plans are common requirements for ISMS and compliance activities. These plans must be periodically tested as well as documented. In OpenStack, key areas are found in the management security domain, and anywhere that single points of failure (SPOFs) can be identified.
Annual, role-specific, security training is a mandatory requirement for almost all compliance certifications and attestations. To optimize the effectiveness of security training, a common method is to provide role specific training, for example to developers, operational personnel, and non-technical employees. Additional cloud security or OpenStack security training based on this hardening guide would be ideal.
As OpenStack is a popular open source project, much of the codebase and architecture has been scrutinized by individual contributors, organizations, and enterprises. This can be advantageous from a security perspective, however the need for security reviews is still a critical consideration for service providers, as deployments vary, and security is not always the primary concern for contributors. A comprehensive security review process may include architectural review, threat modeling, source code analysis and penetration testing. There are many techniques and recommendations for conducting security reviews that can be found publicly posted. A well-tested example is the Microsoft SDL, created as part of the Microsoft Trustworthy Computing Initiative.
Security updates are critical to any IaaS deployment, whether private or public. Vulnerable systems expand attack surfaces, and are obvious targets for attackers. Common scanning technologies and vulnerability notification services can help mitigate this threat. It is important that scans are authenticated and that mitigation strategies extend beyond simple perimeter hardening. Multi-tenant architectures such as OpenStack are particularly prone to hypervisor vulnerabilities, making this a critical part of the system for vulnerability management.
Data Classification defines a method for classifying and handling information, often to protect customer information from accidental or deliberate theft, loss, or inappropriate disclosure. Most commonly, this involves classifying information as sensitive or non-sensitive, or as personally identifiable information (PII). Depending on the context of the deployment various other classifying criteria may be used (government, health-care). The underlying principle is that data classifications are clearly defined and in-use. The most common protective mechanisms include industry standard encryption technologies.
An exception process is an important component of an ISMS. When certain actions are not compliant with security policies that an organization has defined, they must be logged. Appropriate justification, description and mitigation details need to be included, and signed off by appropriate authorities. OpenStack default configurations may vary in meeting various compliance criteria, areas that fail to meet compliance requirements should be logged, with potential fixes considered for contribution to the community.