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Merge pull request #88344 from enj/enj/i/sa_oidc_all_authenticated

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Allow system:serviceaccounts to read the SA discovery endpoints
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Kubernetes Prow Robot 2020-03-17 16:20:47 -07:00 committed by GitHub
commit 50d574bf7f
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2 changed files with 16 additions and 2 deletions
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1
plugin/pkg/auth/authorizer/rbac/bootstrappolicy/BUILD
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@ -22,6 +22,7 @@ go_library(
"//staging/src/k8s.io/apimachinery/pkg/api/meta:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
"//staging/src/k8s.io/apiserver/pkg/authentication/serviceaccount:go_default_library",
"//staging/src/k8s.io/apiserver/pkg/authentication/user:go_default_library",
"//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
"//vendor/k8s.io/klog:go_default_library",

17
plugin/pkg/auth/authorizer/rbac/bootstrappolicy/policy.go
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@ -22,6 +22,7 @@ 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/serviceaccount"
"k8s.io/apiserver/pkg/authentication/user"
utilfeature "k8s.io/apiserver/pkg/util/feature"
rbacv1helpers "k8s.io/kubernetes/pkg/apis/rbac/v1"
@ -486,8 +487,6 @@ func ClusterRoles() []rbacv1.ClusterRole {
if utilfeature.DefaultFeatureGate.Enabled(features.ServiceAccountIssuerDiscovery) {
// Add the cluster role for reading the ServiceAccountIssuerDiscovery endpoints
// but do not bind it explicitly. Leave the decision of who can read it up
// to cluster admins.
roles = append(roles, rbacv1.ClusterRole{
ObjectMeta: metav1.ObjectMeta{Name: "system:service-account-issuer-discovery"},
Rules: []rbacv1.PolicyRule{
@ -575,6 +574,20 @@ func ClusterRoleBindings() []rbacv1.ClusterRoleBinding {
},
}
if utilfeature.DefaultFeatureGate.Enabled(features.ServiceAccountIssuerDiscovery) {
// Allow all in-cluster workloads (via their service accounts) to read the OIDC discovery endpoints.
// Users with certain forms of write access (create pods, create secrets, create service accounts, etc)
// can gain access to a service account identity which would allow them to access this information.
// This includes the issuer URL, which is already present in the SA token JWT. Similarly, SAs can
// already gain this same info via introspection of their own token. Since this discovery endpoint
// points to what issued all service account tokens, it seems fitting for SAs to have this access.
// Defer to the cluster admin with regard to binding directly to all authenticated and/or
// unauthenticated users.
rolebindings = append(rolebindings,
rbacv1helpers.NewClusterBinding("system:service-account-issuer-discovery").Groups(serviceaccount.AllServiceAccountsGroup).BindingOrDie(),
)
}
addClusterRoleBindingLabel(rolebindings)
return rolebindings