Security Context Constraints (SCCs) are a Kubernetes feature, primarily used in OpenShift, that control the actions that a pod can perform and what it has the ability to access. SCCs manage permissions for Pods, including things like running as a privileged user, using host networking, and accessing host directories. While Kubernetes doesn't natively have SCCs, the concept can be translated using Pod Security Admission (PSA) and Pod Security Policies (PSPs), though PSPs are deprecated. With PSA being the standard, here’s how to implement and enforce security policies, focusing on PSA with considerations for the older PSP approach:
1. Understanding Security Policies:
Before implementing any constraints, define the security policies you want to enforce. These policies should align with your organization's security requirements and best practices. Some common security policies include:
Restricting privileged containers: Preventing containers from running with root privileges.
Controlling host networking: Limiting Pods' ability to use the host's network namespace.
Limiting host filesystem access: Preventing Pods from accessing the host's filesystem.
Controlling capabilities: Restricting the Linux capabilities that containers can use.
Enforcing security labels: Requiring Pods to have specific security labels.
2. Using Pod Security Admission (PSA):
Pod Security Admission is the recommended way to enforce security policies. PSA enforces predefined Pod Security Standards, which are a set of increasingly restrictive policies. The standards are:
Privileged: Unrestricted policy, providing the broadest possible permissions.
Baseline: Minimally restrictive policy, preventing known privilege esc....
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