Helm, the tool for managing Kubernetes packages called charts
Agenda
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Helm… What is Helm?
Helm architecture
An attack vector
Securing Helm: RBAC, Release, Chart repo, gRPC…
Helm future and alternatives
Q&A
software development in the recent decade junior speaker - Python, Kubernetes committee member (Moscow Python, Helm Summit) huge fan of laptop stickers
in Singapore * Alex Khaerov company who I am Development Lead doing software development in the recent decade junior speaker - Python, Kubernetes committee member (Moscow Python, Helm Summit) huge fan of laptop stickers
who has been restricted to a single namespace using RBAC several angles from which someone might try to abuse Helm/Tiller: An attack vector • A privileged API user, such as a cluster-admin.
who has been restricted to a single namespace using RBAC several angles from which someone might try to abuse Helm/Tiller: An attack vector • A privileged API user, such as a cluster-admin.
who has been restricted to a single namespace using RBAC • An in-cluster process, such as a compromised webserver. several angles from which someone might try to abuse Helm/Tiller: An attack vector • A privileged API user, such as a cluster-admin.
who has been restricted to a single namespace using RBAC • An in-cluster process, such as a compromised webserver. several angles from which someone might try to abuse Helm/Tiller: An attack vector • A privileged API user, such as a cluster-admin.
containing unexpected resources. These can either escalate one of the other groups above, or run other malicious jobs. • A low-privilege API user, such as a user who has been restricted to a single namespace using RBAC • An in-cluster process, such as a compromised webserver. several angles from which someone might try to abuse Helm/Tiller: An attack vector • A privileged API user, such as a cluster-admin.
ns Kube-api server Tiller-deploy svc Release configmap Microservice pod release ns(s) Release deployment Tiller-deploy pod Service Account Release svc Release configmap Kubeconfig An attack vector
service account in a namespace Kubernetes RBAC Tiller-deploy svc Tiller-deploy pod Service Account Release configmap (RBAC) Default Service Account Rest API
service account in a namespace Kubernetes RBAC Tiller-deploy svc Tiller-deploy pod Service Account Release configmap (RBAC) Default Service Account Rest API advocacy site for RBAC https://rbac.dev/
service account in a namespace Kubernetes RBAC Tiller-deploy svc Tiller-deploy pod Service Account Release configmap (RBAC) Default Service Account Rest API
the default service account in a namespace Kubernetes RBAC • helm init does not create the associated ServiceAccount/Roles/RoleBindings ☝ Tiller-deploy svc Tiller-deploy pod Service Account Release configmap (RBAC) Rest API
ns Kube-api server Tiller-deploy svc Release configmap Tiller-deploy pod Service Account Helm CLI Kubeconfig Cluster Admin X Team Kube-api server Tiller-deploy svc Release configmap Tiller-deploy pod Service Account Release deployment Release svc Release configmap RestAPI RBAC gRPC RestAPI RBAC • No multi-tenancy support • Solution - Multi-Tiller installations • Per developer, per team, per environment X Team ns ?
ns Kube-api server Tiller-deploy svc Release configmap Tiller-deploy pod Service Account Helm CLI Kubeconfig Cluster Admin X Team Kube-api server Tiller-deploy svc Release configmap Tiller-deploy pod Service Account Release deployment Release svc Release configmap RestAPI RBAC gRPC RestAPI RBAC • No multi-tenancy support • Solution - Multi-Tiller installations • Per developer, per team, per environment X Team ns
Release information Tiller-deploy svc Tiller-deploy pod Service Account Role RoleBinding Release secrets RBAC Release secrets Release configmap Is this the 1MB limit?
is a plugin that allows to manage private repos on GCS Authentification using: • application default credentials • service account (via the global flag)
system (ansible, terraform, chef …) • Operator Framework (2k ⭐) Helm add-ons: • Draft, Scaffold Alternatives more control more k8s native v3 v2 K Ksonnet, Metaparticle
system (ansible, terraform, chef …) • Operator Framework (2k ⭐) Helm add-ons: • Draft, Scaffold Alternatives more control more k8s native v3 Y Your Cfg management v2 K Ksonnet, Metaparticle
system (ansible, terraform, chef …) • Operator Framework (2k ⭐) Helm add-ons: • Draft, Scaffold Alternatives more control more k8s native v3 Operator Framework Y Your Cfg management v2 K Ksonnet, Metaparticle
system (ansible, terraform, chef …) • Operator Framework (2k ⭐) Helm add-ons: • Draft, Scaffold Alternatives more control more k8s native v3 Operator Framework Y Your Cfg management v2 A Draft, Skaffold K Ksonnet, Metaparticle
client only architecture (no more Tiller) • State storage based of Release object (based on CRD) • Initial support for OCI repositories • (optional) Embedded Lua engine for scripting • Schematised values files (using JSONSchema) • Single event-driven model Current status: 3.0.0-alpha.1 released The future of Helm 3
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aleyda
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