KubeArmor
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KubeArmor is a cloud-native runtime security enforcement system that restricts the behavior (such as process execution, file access, and networking operations) of containers and nodes (VMs) at the system level.
KubeArmor leverages Linux security modules (LSMs) such as AppArmor, SELinux, or BPF-LSM) to enforce the user-specified policies. KubeArmor generates alerts/telemetry events with container/pod/namespace identities by leveraging eBPF.
KubeArmor High Level Design
- Restrict the behavior of containers and nodes (VMs) at the system levelTraditional container security solutions protect containers by determining their inter-container relations (i.e., service flows) at the network level. In contrast, KubeArmor prevents malicious or unknown behaviors in containers by specifying their desired actions (e.g., a specific process should only be allowed to access a sensitive file). KubeArmor also allows operators to restrict the behaviors of nodes (VMs) based on node identities.
- Enforce security policies to containers and nodes (VMs) at runtimeIn general, security policies (e.g., Seccomp and AppArmor profiles) are statically defined within pod definitions for Kubernetes, and they are applied to containers at creation time. Then, the security policies are not allowed to be updated in runtime.To address those problems, KubeArmor users k8s CRDs to define security policies, such that the orchestration of the policy is handled by the k8s control plane. KubeArmor leverages Linux Security Modules (LSMs) to enforce the security policies at the container level according to the labels of given containers and security policies. Similiarly, KubeArmor support policy enforcement at the Host/Node/VM level using
KubeArmorHostSecurityPolicyk8s resource. - Produce container-aware alerts and system logsLSMs do not have any container-related information; thus, they generate alerts and system logs only based on system metadata (e.g., User ID, Group ID, and process ID). It is hard to figure out what containers cause policy violations. KubeArmor uses an eBPF-based system monitor to keep track of process life cycles in containers and even nodes, and converts system metadata to container/node identities when LSMs generate alerts and system logs for any policy violations from containers and nodes (VMs).
- Provide easy-to-use semantics for policy definitionsKubeArmor provides the ability to monitor the life cycles of containers' processes and take policy decisions based on them. In general, it is much easier to deny a specific action, but it is more difficult to allow only specific actions while denying all. KubeArmor manages internal complexities associated with handling such policy decisions and provides easy semantics towards policy language.
- Support network security enforcement among containersKubeArmor aims to protect containers and nodes (VMs) themselves rather than inter-container/inter-node communications. However, using KubeArmor a user can add policies that could apply policy settings at the level of network system calls (e.g., bind(), listen(), accept(), and connect()), thus controlling interactions among containers and nodes (VMs).
Please take a look at the following documents.
- 1.
If you want to make a contribution, please refer to the following documents too.
- 3.
Please join the KubeArmor Slack channel to communicate with KubeArmor community. We always welcome having a discussion about the problems that you face during the use of KubeArmor.
KubeArmor is licensed under the Apache License, Version 2.0.
The eBPF-based container monitor is licensed under the General Public License, Version 2.0.
KubeArmor is Sandbox Project of the Cloud Native Computing Foundation
Last modified 14d ago