Merge pull request kubernetes#38626 from deads2k/rbac-21-e2e-enable

Automatic merge from submit-queue

Enforce the RBAC authorizer in e2e for controllers and proxy

Turns on RBAC and updates the GCE controllers to use discrete service accounts.

Opening pull to start completing roles.

cluster/gce/gci/configure-helper.sh

@@ -208,8 +208,9 @@ function create-master-auth {
   local -r known_tokens_csv="${auth_dir}/known_tokens.csv"
   if [[ ! -e "${known_tokens_csv}" ]]; then
     echo "${KUBE_BEARER_TOKEN},admin,admin" > "${known_tokens_csv}"
-    echo "${KUBELET_TOKEN},kubelet,kubelet" >> "${known_tokens_csv}"
-    echo "${KUBE_PROXY_TOKEN},kube_proxy,kube_proxy" >> "${known_tokens_csv}"
+    echo "${KUBE_CONTROLLER_MANAGER_TOKEN},system:kube-controller-manager,uid:system:kube-controller-manager" >> "${known_tokens_csv}"
+    echo "${KUBELET_TOKEN},system:node:node-name,uid:kubelet,system:nodes" >> "${known_tokens_csv}"
+    echo "${KUBE_PROXY_TOKEN},system:kube-proxy,uid:kube_proxy" >> "${known_tokens_csv}"
   fi
   local use_cloud_config="false"
   cat <<EOF >/etc/gce.conf
@@ -354,6 +355,7 @@ function create-master-kubelet-auth {
     REGISTER_MASTER_KUBELET="true"
     create-kubelet-kubeconfig
   fi
+
 }
 
 function create-kubeproxy-kubeconfig {
@@ -378,6 +380,30 @@ current-context: service-account-context
 EOF
 }
 
+function create-kubecontrollermanager-kubeconfig {
+  echo "Creating kube-controller-manager kubeconfig file"
+  mkdir -p /etc/srv/kubernetes/kube-controller-manager
+  cat <<EOF >/etc/srv/kubernetes/kube-controller-manager/kubeconfig
+apiVersion: v1
+kind: Config
+users:
+- name: kube-controller-manager
+  user:
+    token: ${KUBE_CONTROLLER_MANAGER_TOKEN}
+clusters:
+- name: local
+  cluster:
+    insecure-skip-tls-verify: true
+    server: https://localhost:443
+contexts:
+- context:
+    cluster: local
+    user: kube-controller-manager
+  name: service-account-context
+current-context: service-account-context
+EOF
+}
+
 function create-master-etcd-auth {
   if [[ -n "${ETCD_CA_CERT:-}" && -n "${ETCD_PEER_KEY:-}" && -n "${ETCD_PEER_CERT:-}" ]]; then
     local -r auth_dir="/etc/srv/kubernetes"
@@ -838,7 +864,7 @@ function start-kube-apiserver {
     webhook_authn_config_volume="{\"name\": \"webhookauthnconfigmount\",\"hostPath\": {\"path\": \"/etc/gcp_authn.config\"}},"
   fi
 
-  params+=" --authorization-mode=ABAC"
+  params+=" --authorization-mode=RBAC,ABAC"
   local webhook_config_mount=""
   local webhook_config_volume=""
   if [[ -n "${GCP_AUTHZ_URL:-}" ]]; then
@@ -897,11 +923,13 @@ function start-kube-apiserver {
 #   DOCKER_REGISTRY
 function start-kube-controller-manager {
   echo "Start kubernetes controller-manager"
+  create-kubecontrollermanager-kubeconfig
   prepare-log-file /var/log/kube-controller-manager.log
   # Calculate variables and assemble the command line.
   local params="${CONTROLLER_MANAGER_TEST_LOG_LEVEL:-"--v=2"} ${CONTROLLER_MANAGER_TEST_ARGS:-} ${CLOUD_CONFIG_OPT}"
+  params+=" --use-service-account-credentials"
   params+=" --cloud-provider=gce"
-  params+=" --master=127.0.0.1:8080"
+  params+=" --kubeconfig=/etc/srv/kubernetes/kube-controller-manager/kubeconfig"
   params+=" --root-ca-file=/etc/srv/kubernetes/ca.crt"
   params+=" --service-account-private-key-file=/etc/srv/kubernetes/server.key"
   if [[ -n "${ENABLE_GARBAGE_COLLECTOR:-}" ]]; then
@@ -1253,6 +1281,9 @@ if [[ -n "${KUBE_USER:-}" ]]; then
   fi
 fi
 
+# generate the controller manager token here since its only used on the master.
+KUBE_CONTROLLER_MANAGER_TOKEN=$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64 | tr -d "=+/" | dd bs=32 count=1 2>/dev/null)
+
 setup-os-params
 config-ip-firewall
 create-dirs

cluster/saltbase/salt/kube-apiserver/abac-authz-policy.jsonl

@@ -2,7 +2,6 @@
 {"apiVersion": "abac.authorization.kubernetes.io/v1beta1", "kind": "Policy", "spec": {"user":"admin", "namespace": "*", "resource": "*", "apiGroup": "*", "nonResourcePath": "*"}}
 {"apiVersion": "abac.authorization.kubernetes.io/v1beta1", "kind": "Policy", "spec": {"user":"{{kube_user}}", "namespace": "*", "resource": "*", "apiGroup": "*", "nonResourcePath": "*"}}
 {"apiVersion": "abac.authorization.kubernetes.io/v1beta1", "kind": "Policy", "spec": {"user":"kubelet", "namespace": "*", "resource": "*", "apiGroup": "*", "nonResourcePath": "*"}}
-{"apiVersion": "abac.authorization.kubernetes.io/v1beta1", "kind": "Policy", "spec": {"user":"kube_proxy", "namespace": "*", "resource": "*", "apiGroup": "*", "nonResourcePath": "*"}}
 {"apiVersion": "abac.authorization.kubernetes.io/v1beta1", "kind": "Policy", "spec": {"user":"kubecfg", "namespace": "*", "resource": "*", "apiGroup": "*", "nonResourcePath": "*"}}
 {"apiVersion": "abac.authorization.kubernetes.io/v1beta1", "kind": "Policy", "spec": {"user":"client", "namespace": "*", "resource": "*", "apiGroup": "*", "nonResourcePath": "*"}}
 {"apiVersion": "abac.authorization.kubernetes.io/v1beta1", "kind": "Policy", "spec": {"group":"system:serviceaccounts", "namespace": "*", "resource": "*", "apiGroup": "*", "nonResourcePath": "*"}}

plugin/pkg/auth/authorizer/rbac/BUILD

@@ -21,6 +21,7 @@ go_library(
         "//pkg/auth/authorizer:go_default_library",
         "//pkg/auth/user:go_default_library",
         "//pkg/util/errors:go_default_library",
+        "//vendor:github.com/golang/glog",
     ],
 )
 

plugin/pkg/auth/authorizer/rbac/rbac.go

@@ -18,6 +18,8 @@ limitations under the License.
 package rbac
 
 import (
+	"github.com/golang/glog"
+
 	"k8s.io/kubernetes/pkg/apis/rbac"
 	"k8s.io/kubernetes/pkg/apis/rbac/validation"
 	"k8s.io/kubernetes/pkg/auth/authorizer"
@@ -42,6 +44,9 @@ func (r *RBACAuthorizer) Authorize(requestAttributes authorizer.Attributes) (boo
 		return true, "", nil
 	}
 
+	glog.V(2).Infof("RBAC DENY: user %q groups %v cannot %q on \"%v.%v/%v\"", requestAttributes.GetUser().GetName(), requestAttributes.GetUser().GetGroups(),
+		requestAttributes.GetVerb(), requestAttributes.GetResource(), requestAttributes.GetAPIGroup(), requestAttributes.GetSubresource())
+
 	return false, "", ruleResolutionError
 }