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policy.go
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policy.go
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/*
Copyright 2016 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package bootstrappolicy
import (
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apiserver/pkg/authentication/user"
rbac "k8s.io/kubernetes/pkg/apis/rbac"
)
var (
ReadWrite = []string{"get", "list", "watch", "create", "update", "patch", "delete", "deletecollection"}
Read = []string{"get", "list", "watch"}
Label = map[string]string{"kubernetes.io/bootstrapping": "rbac-defaults"}
Annotation = map[string]string{rbac.AutoUpdateAnnotationKey: "true"}
)
const (
legacyGroup = ""
appsGroup = "apps"
authenticationGroup = "authentication.k8s.io"
authorizationGroup = "authorization.k8s.io"
autoscalingGroup = "autoscaling"
batchGroup = "batch"
certificatesGroup = "certificates.k8s.io"
extensionsGroup = "extensions"
policyGroup = "policy"
rbacGroup = "rbac.authorization.k8s.io"
storageGroup = "storage.k8s.io"
)
func addDefaultMetadata(obj runtime.Object) {
metadata, err := meta.Accessor(obj)
if err != nil {
// if this happens, then some static code is broken
panic(err)
}
labels := metadata.GetLabels()
if labels == nil {
labels = map[string]string{}
}
for k, v := range Label {
labels[k] = v
}
metadata.SetLabels(labels)
annotations := metadata.GetAnnotations()
if annotations == nil {
annotations = map[string]string{}
}
for k, v := range Annotation {
annotations[k] = v
}
metadata.SetAnnotations(annotations)
}
func addClusterRoleLabel(roles []rbac.ClusterRole) {
for i := range roles {
addDefaultMetadata(&roles[i])
}
return
}
func addClusterRoleBindingLabel(rolebindings []rbac.ClusterRoleBinding) {
for i := range rolebindings {
addDefaultMetadata(&rolebindings[i])
}
return
}
// ClusterRoles returns the cluster roles to bootstrap an API server with
func ClusterRoles() []rbac.ClusterRole {
roles := []rbac.ClusterRole{
{
// a "root" role which can do absolutely anything
ObjectMeta: metav1.ObjectMeta{Name: "cluster-admin"},
Rules: []rbac.PolicyRule{
rbac.NewRule("*").Groups("*").Resources("*").RuleOrDie(),
rbac.NewRule("*").URLs("*").RuleOrDie(),
},
},
{
// a role which provides just enough power to determine if the server is ready and discover API versions for negotiation
ObjectMeta: metav1.ObjectMeta{Name: "system:discovery"},
Rules: []rbac.PolicyRule{
rbac.NewRule("get").URLs("/healthz", "/version", "/swaggerapi", "/swaggerapi/*", "/api", "/api/*", "/apis", "/apis/*").RuleOrDie(),
},
},
{
// a role which provides minimal resource access to allow a "normal" user to learn information about themselves
ObjectMeta: metav1.ObjectMeta{Name: "system:basic-user"},
Rules: []rbac.PolicyRule{
// TODO add future selfsubjectrulesreview, project request APIs, project listing APIs
rbac.NewRule("create").Groups(authorizationGroup).Resources("selfsubjectaccessreviews").RuleOrDie(),
},
},
{
// a role for a namespace level admin. It is `edit` plus the power to grant permissions to other users.
ObjectMeta: metav1.ObjectMeta{Name: "admin"},
Rules: []rbac.PolicyRule{
rbac.NewRule(ReadWrite...).Groups(legacyGroup).Resources("pods", "pods/attach", "pods/proxy", "pods/exec", "pods/portforward").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(legacyGroup).Resources("replicationcontrollers", "replicationcontrollers/scale", "serviceaccounts",
"services", "services/proxy", "endpoints", "persistentvolumeclaims", "configmaps", "secrets").RuleOrDie(),
rbac.NewRule(Read...).Groups(legacyGroup).Resources("limitranges", "resourcequotas", "bindings", "events",
"pods/status", "resourcequotas/status", "namespaces/status", "replicationcontrollers/status", "pods/log").RuleOrDie(),
// read access to namespaces at the namespace scope means you can read *this* namespace. This can be used as an
// indicator of which namespaces you have access to.
rbac.NewRule(Read...).Groups(legacyGroup).Resources("namespaces").RuleOrDie(),
rbac.NewRule("impersonate").Groups(legacyGroup).Resources("serviceaccounts").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(appsGroup).Resources("statefulsets",
"deployments", "deployments/scale", "deployments/rollback").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(autoscalingGroup).Resources("horizontalpodautoscalers").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(batchGroup).Resources("jobs", "cronjobs", "scheduledjobs").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(extensionsGroup).Resources("daemonsets",
"deployments", "deployments/scale", "deployments/rollback", "ingresses",
"replicasets", "replicasets/scale", "replicationcontrollers/scale").RuleOrDie(),
// additional admin powers
rbac.NewRule("create").Groups(authorizationGroup).Resources("localsubjectaccessreviews").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(rbacGroup).Resources("roles", "rolebindings").RuleOrDie(),
},
},
{
// a role for a namespace level editor. It grants access to all user level actions in a namespace.
// It does not grant powers for "privileged" resources which are domain of the system: `/status`
// subresources or `quota`/`limits` which are used to control namespaces
ObjectMeta: metav1.ObjectMeta{Name: "edit"},
Rules: []rbac.PolicyRule{
rbac.NewRule(ReadWrite...).Groups(legacyGroup).Resources("pods", "pods/attach", "pods/proxy", "pods/exec", "pods/portforward").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(legacyGroup).Resources("replicationcontrollers", "replicationcontrollers/scale", "serviceaccounts",
"services", "services/proxy", "endpoints", "persistentvolumeclaims", "configmaps", "secrets").RuleOrDie(),
rbac.NewRule(Read...).Groups(legacyGroup).Resources("limitranges", "resourcequotas", "bindings", "events",
"pods/status", "resourcequotas/status", "namespaces/status", "replicationcontrollers/status", "pods/log").RuleOrDie(),
// read access to namespaces at the namespace scope means you can read *this* namespace. This can be used as an
// indicator of which namespaces you have access to.
rbac.NewRule(Read...).Groups(legacyGroup).Resources("namespaces").RuleOrDie(),
rbac.NewRule("impersonate").Groups(legacyGroup).Resources("serviceaccounts").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(appsGroup).Resources("statefulsets",
"deployments", "deployments/scale", "deployments/rollback").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(autoscalingGroup).Resources("horizontalpodautoscalers").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(batchGroup).Resources("jobs", "cronjobs", "scheduledjobs").RuleOrDie(),
rbac.NewRule(ReadWrite...).Groups(extensionsGroup).Resources("daemonsets",
"deployments", "deployments/scale", "deployments/rollback", "ingresses",
"replicasets", "replicasets/scale", "replicationcontrollers/scale").RuleOrDie(),
},
},
{
// a role for namespace level viewing. It grants Read-only access to non-escalating resources in
// a namespace.
ObjectMeta: metav1.ObjectMeta{Name: "view"},
Rules: []rbac.PolicyRule{
rbac.NewRule(Read...).Groups(legacyGroup).Resources("pods", "replicationcontrollers", "replicationcontrollers/scale", "serviceaccounts",
"services", "endpoints", "persistentvolumeclaims", "configmaps").RuleOrDie(),
rbac.NewRule(Read...).Groups(legacyGroup).Resources("limitranges", "resourcequotas", "bindings", "events",
"pods/status", "resourcequotas/status", "namespaces/status", "replicationcontrollers/status", "pods/log").RuleOrDie(),
// read access to namespaces at the namespace scope means you can read *this* namespace. This can be used as an
// indicator of which namespaces you have access to.
rbac.NewRule(Read...).Groups(legacyGroup).Resources("namespaces").RuleOrDie(),
rbac.NewRule(Read...).Groups(appsGroup).Resources("statefulsets", "deployments", "deployments/scale").RuleOrDie(),
rbac.NewRule(Read...).Groups(autoscalingGroup).Resources("horizontalpodautoscalers").RuleOrDie(),
rbac.NewRule(Read...).Groups(batchGroup).Resources("jobs", "cronjobs", "scheduledjobs").RuleOrDie(),
rbac.NewRule(Read...).Groups(extensionsGroup).Resources("daemonsets", "deployments", "deployments/scale",
"ingresses", "replicasets", "replicasets/scale", "replicationcontrollers/scale").RuleOrDie(),
},
},
{
// a role to use for heapster's connections back to the API server
ObjectMeta: metav1.ObjectMeta{Name: "system:heapster"},
Rules: []rbac.PolicyRule{
rbac.NewRule(Read...).Groups(legacyGroup).Resources("events", "pods", "nodes", "namespaces").RuleOrDie(),
},
},
{
// a role for nodes to use to have the access they need for running pods
ObjectMeta: metav1.ObjectMeta{Name: "system:node"},
Rules: []rbac.PolicyRule{
// Needed to check API access. These creates are non-mutating
rbac.NewRule("create").Groups(authenticationGroup).Resources("tokenreviews").RuleOrDie(),
rbac.NewRule("create").Groups(authorizationGroup).Resources("subjectaccessreviews", "localsubjectaccessreviews").RuleOrDie(),
// Needed to build serviceLister, to populate env vars for services
rbac.NewRule(Read...).Groups(legacyGroup).Resources("services").RuleOrDie(),
// Nodes can register themselves
// TODO: restrict to creating a node with the same name they announce
rbac.NewRule("create", "get", "list", "watch").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
// TODO: restrict to the bound node once supported
rbac.NewRule("update", "patch").Groups(legacyGroup).Resources("nodes/status").RuleOrDie(),
rbac.NewRule("update", "patch", "delete").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
// TODO: restrict to the bound node as creator once supported
rbac.NewRule("create", "update", "patch").Groups(legacyGroup).Resources("events").RuleOrDie(),
// TODO: restrict to pods scheduled on the bound node once supported
rbac.NewRule(Read...).Groups(legacyGroup).Resources("pods").RuleOrDie(),
// TODO: remove once mirror pods are removed
// TODO: restrict deletion to mirror pods created by the bound node once supported
// Needed for the node to create/delete mirror pods
rbac.NewRule("get", "create", "delete").Groups(legacyGroup).Resources("pods").RuleOrDie(),
// TODO: restrict to pods scheduled on the bound node once supported
rbac.NewRule("update").Groups(legacyGroup).Resources("pods/status").RuleOrDie(),
// TODO: restrict to secrets and configmaps used by pods scheduled on bound node once supported
// Needed for imagepullsecrets, rbd/ceph and secret volumes, and secrets in envs
// Needed for configmap volume and envs
rbac.NewRule("get").Groups(legacyGroup).Resources("secrets", "configmaps").RuleOrDie(),
// TODO: restrict to claims/volumes used by pods scheduled on bound node once supported
// Needed for persistent volumes
rbac.NewRule("get").Groups(legacyGroup).Resources("persistentvolumeclaims", "persistentvolumes").RuleOrDie(),
// TODO: restrict to namespaces of pods scheduled on bound node once supported
// TODO: change glusterfs to use DNS lookup so this isn't needed?
// Needed for glusterfs volumes
rbac.NewRule("get").Groups(legacyGroup).Resources("endpoints").RuleOrDie(),
// Used to create a certificatesigningrequest for a node-specific client certificate, and watch
// for it to be signed. This allows the kubelet to rotate it's own certificate.
rbac.NewRule("create", "get", "list", "watch").Groups(certificatesGroup).Resources("certificatesigningrequests").RuleOrDie(),
},
},
{
// a role to use for node-problem-detector access. It does not get bound to default location since
// deployment locations can reasonably vary.
ObjectMeta: metav1.ObjectMeta{Name: "system:node-problem-detector"},
Rules: []rbac.PolicyRule{
rbac.NewRule("get").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
rbac.NewRule("patch").Groups(legacyGroup).Resources("nodes/status").RuleOrDie(),
eventsRule(),
},
},
{
// a role to use for setting up a proxy
ObjectMeta: metav1.ObjectMeta{Name: "system:node-proxier"},
Rules: []rbac.PolicyRule{
// Used to build serviceLister
rbac.NewRule("list", "watch").Groups(legacyGroup).Resources("services", "endpoints").RuleOrDie(),
rbac.NewRule("get").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
eventsRule(),
},
},
{
// a role to use for bootstrapping a node's client certificates
ObjectMeta: metav1.ObjectMeta{Name: "system:node-bootstrapper"},
Rules: []rbac.PolicyRule{
// used to create a certificatesigningrequest for a node-specific client certificate, and watch for it to be signed
rbac.NewRule("create", "get", "list", "watch").Groups(certificatesGroup).Resources("certificatesigningrequests").RuleOrDie(),
},
},
{
// a role to use for allowing authentication and authorization delegation
ObjectMeta: metav1.ObjectMeta{Name: "system:auth-delegator"},
Rules: []rbac.PolicyRule{
// These creates are non-mutating
rbac.NewRule("create").Groups(authenticationGroup).Resources("tokenreviews").RuleOrDie(),
rbac.NewRule("create").Groups(authorizationGroup).Resources("subjectaccessreviews").RuleOrDie(),
},
},
{
// a role to use for the API registry, summarization, and proxy handling
ObjectMeta: metav1.ObjectMeta{Name: "system:kube-aggregator"},
Rules: []rbac.PolicyRule{
// it needs to see all services so that it knows whether the ones it points to exist or not
rbac.NewRule(Read...).Groups(legacyGroup).Resources("services", "endpoints").RuleOrDie(),
},
},
{
// a role to use for bootstrapping the kube-controller-manager so it can create the shared informers
// service accounts, and secrets that we need to create separate identities for other controllers
ObjectMeta: metav1.ObjectMeta{Name: "system:kube-controller-manager"},
Rules: []rbac.PolicyRule{
eventsRule(),
rbac.NewRule("create").Groups(legacyGroup).Resources("endpoints", "secrets", "serviceaccounts").RuleOrDie(),
rbac.NewRule("delete").Groups(legacyGroup).Resources("secrets").RuleOrDie(),
rbac.NewRule("get").Groups(legacyGroup).Resources("endpoints", "namespaces", "serviceaccounts").RuleOrDie(),
rbac.NewRule("update").Groups(legacyGroup).Resources("endpoints", "serviceaccounts").RuleOrDie(),
// Needed to check API access. These creates are non-mutating
rbac.NewRule("create").Groups(authenticationGroup).Resources("tokenreviews").RuleOrDie(),
rbac.NewRule("list", "watch").Groups(legacyGroup).Resources(
"configmaps",
"namespaces",
"nodes",
"persistentvolumeclaims",
"persistentvolumes",
"pods",
"replicationcontrollers",
"resourcequotas",
"secrets",
"services",
"serviceaccounts",
).RuleOrDie(),
rbac.NewRule("list", "watch").Groups(extensionsGroup).Resources(
"daemonsets",
"deployments",
"podsecuritypolicies",
"replicasets",
).RuleOrDie(),
rbac.NewRule("list", "watch").Groups(appsGroup).Resources("deployments").RuleOrDie(),
rbac.NewRule("list", "watch").Groups(batchGroup).Resources("jobs", "cronjobs").RuleOrDie(),
rbac.NewRule("list", "watch").Groups(appsGroup).Resources("statefulsets").RuleOrDie(),
rbac.NewRule("list", "watch").Groups(policyGroup).Resources("poddisruptionbudgets").RuleOrDie(),
rbac.NewRule("list", "watch").Groups(autoscalingGroup).Resources("horizontalpodautoscalers").RuleOrDie(),
rbac.NewRule("list", "watch").Groups(certificatesGroup).Resources("certificatesigningrequests").RuleOrDie(),
rbac.NewRule("list", "watch").Groups(storageGroup).Resources("storageclasses").RuleOrDie(),
},
},
{
// a role to use for the kube-scheduler
ObjectMeta: metav1.ObjectMeta{Name: "system:kube-scheduler"},
Rules: []rbac.PolicyRule{
eventsRule(),
// this is for leaderlease access
// TODO: scope this to the kube-system namespace
rbac.NewRule("create").Groups(legacyGroup).Resources("endpoints").RuleOrDie(),
rbac.NewRule("get", "update", "patch", "delete").Groups(legacyGroup).Resources("endpoints").Names("kube-scheduler").RuleOrDie(),
// fundamental resources
rbac.NewRule(Read...).Groups(legacyGroup).Resources("nodes", "pods").RuleOrDie(),
rbac.NewRule("create").Groups(legacyGroup).Resources("pods/binding", "bindings").RuleOrDie(),
rbac.NewRule("update").Groups(legacyGroup).Resources("pods/status").RuleOrDie(),
// things that select pods
rbac.NewRule(Read...).Groups(legacyGroup).Resources("services", "replicationcontrollers").RuleOrDie(),
rbac.NewRule(Read...).Groups(extensionsGroup).Resources("replicasets").RuleOrDie(),
// things that pods use
rbac.NewRule(Read...).Groups(legacyGroup).Resources("persistentvolumeclaims", "persistentvolumes").RuleOrDie(),
},
},
{
// a role to use for the kube-dns pod
ObjectMeta: metav1.ObjectMeta{Name: "system:kube-dns"},
Rules: []rbac.PolicyRule{
rbac.NewRule("list", "watch").Groups(legacyGroup).Resources("endpoints", "services").RuleOrDie(),
},
},
{
// a role for an external/out-of-tree persistent volume provisioner
ObjectMeta: metav1.ObjectMeta{Name: "system:persistent-volume-provisioner"},
Rules: []rbac.PolicyRule{
rbac.NewRule("get", "list", "watch", "create", "delete").Groups(legacyGroup).Resources("persistentvolumes").RuleOrDie(),
// update is needed in addition to read access for setting lock annotations on PVCs
rbac.NewRule("get", "list", "watch", "update").Groups(legacyGroup).Resources("persistentvolumeclaims").RuleOrDie(),
rbac.NewRule(Read...).Groups(storageGroup).Resources("storageclasses").RuleOrDie(),
// Needed for watching provisioning success and failure events
rbac.NewRule("watch").Groups(legacyGroup).Resources("events").RuleOrDie(),
eventsRule(),
},
},
}
addClusterRoleLabel(roles)
return roles
}
// ClusterRoleBindings return default rolebindings to the default roles
func ClusterRoleBindings() []rbac.ClusterRoleBinding {
rolebindings := []rbac.ClusterRoleBinding{
rbac.NewClusterBinding("cluster-admin").Groups(user.SystemPrivilegedGroup).BindingOrDie(),
rbac.NewClusterBinding("system:discovery").Groups(user.AllAuthenticated, user.AllUnauthenticated).BindingOrDie(),
rbac.NewClusterBinding("system:basic-user").Groups(user.AllAuthenticated, user.AllUnauthenticated).BindingOrDie(),
rbac.NewClusterBinding("system:node").Groups(user.NodesGroup).BindingOrDie(),
rbac.NewClusterBinding("system:node-proxier").Users(user.KubeProxy).BindingOrDie(),
rbac.NewClusterBinding("system:kube-controller-manager").Users(user.KubeControllerManager).BindingOrDie(),
rbac.NewClusterBinding("system:kube-dns").SAs("kube-system", "kube-dns").BindingOrDie(),
rbac.NewClusterBinding("system:kube-scheduler").Users(user.KubeScheduler).BindingOrDie(),
}
addClusterRoleBindingLabel(rolebindings)
return rolebindings
}