eks pod security policy

By • 一月 17th, 2021

© 2020, Amazon Web Services, Inc. or its affiliates. The Kubernetes podSpec includes a set of fields under spec.securityContext, that allow to let you specify the user and/or group to run your application as. If you elect to use pod security policies, you will need to create a role binding that allows service accounts to read your pod security policies. The pod can isolate networks for a group of containers. Reach him on Twitter via @mhausenblas. For all other serviceaccounts/namespaces, we recommend implementing a more restrictive policy such as this: This policy prevents pods from running as privileged or escalating privileges. Pod Security Policies are enabled automatically for all EKS clusters starting with platform version 1.13. While this conveniently lets you to build/run images in Docker containers, you're basically relinquishing complete control of the node to the process running in the container. If a container exceeds its CPU limit, it will be throttled. The first security group we want to apply is the EKS cluster security group, which enables the matched pods launched onto branch network interfaces to communicate with other pods in the cluster such as CoreDNS. a cluster-level resource that controls securitysensitive aspects of the pod specification You may have documentation for developers about setting the security context in a pod specification, and developers may follow it … or they may choose not to. Privileged escalation is basically a way for users to execute a file with the permissions of another user or group. With Fargate, you cannot run a privileged container or configure your pod to use hostNetwork or hostPort. The Jenkins Kubernetes plugin (for ephemeral K8s agents) defaults to using a K8s emptyDir volume type for the Jenkins agent workspace. files containing user/password/authentication information), you’ll be able to identify, block, and further investigate the issue. Kubernetes uses three Quality of Service (QoS) classes to prioritize the workloads running on a node. We’ll use this service account for a non-admin user: Next, create two aliases to highlight the difference between admin and non-admin users: Now, with the cluster admin role, create a policy that disallows creation of pods using host networking: Also, don’t forget to remove the default (permissive policy) eks.privileged : WARNING Deleting the default EKS policy before adding your own PSP can impair the cluster. Pod: Pods are nothing but a collection of containers. While choosing the right distribution for your needs is critical for Kubernetes security, this does not eliminate the need to check for Kubernetes and container security vulnerabilities or misconfigurations. All containers run as root by default. Timeouts. If the limits and requests are configured with different values and not equal to 0, or one container within the pod sets limits and the others don’t or have limits set for different resources, the pods are configured as burstable (medium priority). If you are running an earlier version of Kubernetes under EKS, then you will need to upgrade to use Pod Security Policies. As a Kubernetes practitioner your chief concern should be preventing a process that’s running in a container from escaping the isolation boundaries of Docker and gaining access to the underlying host. While you can’t prevent this from happening all together, setting requests and limits will help minimize resource contention and mitigate the risk from poorly written applications that consume an excessive amount of resources. Michael is an Open Source Product Developer Advocate in the AWS container service team covering open source observability and service meshes. By sensible, I mean that (for example) you may choose to be less restrictive in a dev/test environment compared to a production environment. A psp is a way to enforce certain policies that pod needs to comply with before it’s allowed to be scheduled to be run on the cluster - create or an update operation (perhaps a restart of the pod? For example, pod security policies can be used to prevent containers from running as the root user, and network policies can restrict communication between pods. Please leave any comments below or reach out to me via Twitter! Apply Network Policies. vpc_id - The VPC associated with your cluster. See https://kubernetes.io/docs/concepts/policy/pod-security-policy/#users-and-groups for further information on this topic. As a best practice we recommend that you scope the binding for privileged pods to service accounts within a particular namespace, e.g. Memory is incompressible, i.e. This confirms that the PSP  eks.restrictive works as expected, restricting the privileged pod creation by the developer. # Assume that persistentVolumes set up by the cluster admin are safe to use. Requests don't affect the memory_limit_in_bytes value of the container's cgroup; the cgroup limit is set to the amount of memory available on the host. First, create a dedicated namespace as well as a service account. Pods that are run as privileged, inherit all of the Linux capabilities associated with root on the host and should be avoided if possible. This tooling can be used to manage applications and security policy for containerized applications across on-premises clusters and cloud-hosted environments. ... A service mesh provides additional security over the network, which spans outside the single EKS network. If a container exceeds the requested amount of memory it may be subject to termination if there’s memory pressure on the node. You can prevent a container from using privileged escalation by implementing a pod security policy that sets allowPriviledgedEscalation to false or by setting securityContext.allowPrivilegedEscalation in the podSpec. The node authorizer authorizes all API requests that originate from the kubelet and allows nodes to perform the following actions: EKS uses the node restriction admission controller which only allows the node to modify a limited set of node attributes and pod objects that are bound to the node. CPU and RAM, allocated to a namespace. privileged allows full unrestricted access to pod features. EKS gives them a completely-permissive default policy named eks.privileged. Note For PSPs to work, the respective admission plugin must be enabled, and permissions must be granted to users. The default Pod Security Policies from Amazon EKS is a good starting point, but that doesn’t mean you cannot customize it further or use a customized YAML file to configure your security policies. A Pod Security Policy (PSP) is an object that can control most of the security settings mentioned previously on the cluster level. Security is a critical component of configuring and maintaining Kubernetes clusters and applications. Second, adding the USER directive to your Dockerfile or running the containers in the pod as a non-root user. The manifest for that policy appears below: This PSP allows an authenticated user to run privileged containers across all namespaces within the cluster. Seldom do containers need these types of privileges to function properly. To do that sanely, you grant all users access to the most restrictive PSP. For example, you may want to prevent developers from running a pod with containers that don’t define a user (hence, run as root). it cannot be shared among multiple containers. Pod security policies are cluster level resources. Despite its beta status, the Pod Security Policy API is used by enterprises in production, and by cloud providers such as Amazon EKS. So let’s change this by creating a role psp:unprivileged for the pod security policy eks.restrictive: Now, create the rolebinding to grant the eks-test-user the use verb on the eks.restrictive policy. To check the existing pod security policies in your EKS cluster: Now, to describe the default policy we’ve defined for you: As you can see in the output below – anything goes! Your main task is to define sensible PSPs that are scoped for your environment, and enable them as described above. # This allows "/foo", "/foo/", "/foo/bar" etc., but, Restrict the containers that can run as privileged, Do not run processes in containers as root, Never run Docker in Docker or mount the socket in the container, Restrict the use of hostPath or if hostPath is necessary restrict which prefixes can be used and configure the volume as read-only, Set requests and limits for each container to avoid resource contention and DoS attacks, http://man7.org/linux/man-pages/man7/capabilities.7.html, https://kubernetes.io/docs/concepts/policy/pod-security-policy/#users-and-groups, First to get killed when there's insufficient menory, secrets, configmaps, persistent volume claims and persistent volumes related to pods bound to the kubelet’s node, Read/write access to the CertificateSigningRequest (CSR) API for TLS bootstrapping, the ability to create TokenReview and SubjectAccessReview for delegated authentication/authorization checks.

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