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ccee5d3d89
* Update CNI plugins from v0.6.0 to v0.8.6 to fix several CVEs * Update the base image to alpine:3.12 * Use `flannel-cni` as an init container and remove sleep * https://github.com/poseidon/terraform-render-bootstrap/pull/205 * https://github.com/poseidon/flannel-cni * https://quay.io/repository/poseidon/flannel-cni Background * Switch from github.com/coreos/flannel-cni v0.3.0 which was last published by me in 2017 and is no longer accessible to me to maintain or patch * Port to the poseidon/flannel-cni rewrite, which releases v0.4.0 to continue the prior release numbering
79 lines
3.9 KiB
Markdown
79 lines
3.9 KiB
Markdown
# Security
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Typhoon aims to be minimal and secure. We're running it ourselves after all.
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## Overview
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**Kubernetes**
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* etcd with peer-to-peer and client-auth TLS
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* Kubelets TLS bootstrap certificates (72 hours)
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* Generated TLS certificate (365 days) for admin `kubeconfig`
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* [NodeRestriction](https://kubernetes.io/docs/reference/access-authn-authz/node/) is enabled to limit Kubelet authorization
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* [Role-Based Access Control](https://kubernetes.io/docs/admin/authorization/rbac/) is enabled. Apps must define RBAC policies for API access
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* Workloads run on worker nodes only, unless they tolerate the master taint
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* Kubernetes [Network Policy](https://kubernetes.io/docs/concepts/services-networking/network-policies/) and Calico [NetworkPolicy](https://docs.projectcalico.org/latest/reference/calicoctl/resources/networkpolicy) support [^1]
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[^1]: Requires `networking = "calico"`. Calico is the default on all platforms (AWS, Azure, bare-metal, DigitalOcean, and Google Cloud).
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**Hosts**
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* Container Linux auto-updates are enabled
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* Hosts limit logins to SSH key-based auth (user "core")
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* SELinux enforcing mode [^2]
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[^2]: SELinux is enforcing on Fedora CoreOS, permissive on Flatcar Linux.
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**Platform**
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* Cloud firewalls limit access to ssh, kube-apiserver, and ingress
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* No cluster credentials are stored in Matchbox (used for bare-metal)
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* No cluster credentials are stored in Digital Ocean metadata
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* Cluster credentials are stored in AWS metadata (for ASGs)
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* Cluster credentials are stored in Azure metadata (for scale sets)
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* Cluster credentials are stored in Google Cloud metadata (for managed instance groups)
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* No account credentials are available to Digital Ocean droplets
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* No account credentials are available to AWS EC2 instances (no IAM permissions)
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* No account credentials are available to Azure instances (no IAM permissions)
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* No account credentials are available to Google Cloud instances (no IAM permissions)
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## Precautions
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Typhoon limits exposure to many security threats, but it is not a silver bullet. As usual,
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* Do not run untrusted images or accept manifests from strangers
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* Do not give untrusted users a shell behind your firewall
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* Define network policies for your namespaces
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## Container Images
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Typhoon uses upstream container images (where possible) and upstream binaries.
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!!! note
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Kubernetes releases `kubelet` as a binary for distros to package, either as a DEB/RPM on traditional distros or as a container image for container-optimized operating systems.
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Typhoon [packages](https://github.com/poseidon/kubelet) the upstream Kubelet and its dependencies as a [container image](https://quay.io/repository/poseidon/kubelet). Builds fetch the upstream Kubelet binary and verify its checksum.
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The Kubelet image is published to Quay.io and Dockerhub.
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* [quay.io/poseidon/kubelet](https://quay.io/repository/poseidon/kubelet) (official)
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* [docker.io/psdn/kubelet](https://hub.docker.com/r/psdn/kubelet) (fallback)
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Two tag styles indicate the build strategy used.
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* Typhoon internal infra publishes single and multi-arch images (e.g. `v1.18.4`, `v1.18.4-amd64`, `v1.18.4-arm64`, `v1.18.4-2-g23228e6-amd64`, `v1.18.4-2-g23228e6-arm64`)
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* Quay and Dockerhub automated builds publish verifiable images (e.g. `build-SHA` on Quay, `build-TAG` on Dockerhub)
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The Typhoon-built Kubelet image is used as the official image. Automated builds provide an alternative image for those preferring to trust images built by Quay/Dockerhub (albeit lacking multi-arch). To use the fallback registry or an alternative tag, see [customization](/advanced/customization/#kubelet).
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### flannel-cni
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Typhoon packages the [flannel-cni](https://github.com/poseidon/flannel-cni) container image to provide security patches.
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* [quay.io/poseidon/flannel-cni](https://quay.io/repository/poseidon/flannel-cni) (official)
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## Disclosures
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If you find security issues, please email `security@psdn.io`. If the issue lies in upstream Kubernetes, please inform upstream Kubernetes as well.
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