Demos with Config Sync

With this demo you will be able to:

Sync the Ingress Gateway and the Online Boutique apps
Enforce policies
- Istio sidecar injection policy enforcement
- STRICT mTLS in the Mesh policy enforcement
- AuthorizationPolicies policy enforcement
Fix the policies violations

As prerequisites, you need to have these tools installed:

kubectl

Sync the Ingress Gateway and the Online Boutique apps

Sync the Ingress Gateway and the Online Boutique apps in dedicated namespaces with the istio-ingress istio-injection=enabled label:

cat << EOF | kubectl apply -f -
apiVersion: configsync.gke.io/v1beta1
kind: RootSync
metadata:
  name: root-sync-apps
  namespace: config-management-system
spec:
  sourceFormat: unstructured
  git:
    repo: https://github.com/mathieu-benoit/istio-gatekeeper-demos
    revision: HEAD
    branch: main
    dir: root-sync
    auth: none
EOF

This RootSync will sync the manifests contained in the root-sync folder. This folder contains the RepoSyncs in order to sync both Ingress Gateway and the Online Boutique apps. Each RepoSync has also it's own RoleBinding in order to sync Istio resources.

Wait for the RootSync to be synced:

kubectl get rootsync -A

NAMESPACE                  NAME             RENDERINGCOMMIT                            RENDERINGERRORCOUNT   SOURCECOMMIT                               SOURCEERRORCOUNT   SYNCCOMMIT                                 SYNCERRORCOUNT
config-management-system   root-sync-apps   82b96a9a1a70646c3251ec8edbe5274a4ab14f73                         82b96a9a1a70646c3251ec8edbe5274a4ab14f73                      82b96a9a1a70646c3251ec8edbe5274a4ab14f73

Wait for the 3 RepoSyncs to be synced:

kubectl get reposync -A

NAMESPACE        NAME        RENDERINGCOMMIT                            RENDERINGERRORCOUNT   SOURCECOMMIT                               SOURCEERRORCOUNT   SYNCCOMMIT                                 SYNCERRORCOUNT
best-app-ever    repo-sync   82b96a9a1a70646c3251ec8edbe5274a4ab14f73                         82b96a9a1a70646c3251ec8edbe5274a4ab14f73                      82b96a9a1a70646c3251ec8edbe5274a4ab14f73   
istio-ingress    repo-sync   82b96a9a1a70646c3251ec8edbe5274a4ab14f73                         82b96a9a1a70646c3251ec8edbe5274a4ab14f73                      82b96a9a1a70646c3251ec8edbe5274a4ab14f73   
onlineboutique   repo-sync   82b96a9a1a70646c3251ec8edbe5274a4ab14f73                         82b96a9a1a70646c3251ec8edbe5274a4ab14f73                      82b96a9a1a70646c3251ec8edbe5274a4ab14f73

Check that the Istio sidecar proxies have been injected and successfully deployed:

istioctl version

client version: 1.15.2
control plane version: 1.15.2
data plane version: 1.15.2 (13 proxies)

Note: 13 proxies = 12 from onlineboutique + 1 from istio-ingress.

Wait for the public IP address to be provisioned:

until kubectl get svc istio-ingressgateway -n istio-ingress -o jsonpath='{.status.loadBalancer}' | grep "ingress"; do : ; done

Open the generated public IP address to browse the Online Boutique website:

echo -n "http://" && \
kubectl get svc istio-ingressgateway -n istio-ingress -o json | jq -r '.status.loadBalancer.ingress[0].ip'

Enforce policies

cat << EOF | kubectl apply -f -
apiVersion: configsync.gke.io/v1beta1
kind: RootSync
metadata:
  name: root-sync-policies
  namespace: config-management-system
spec:
  sourceFormat: unstructured
  git:
    repo: https://github.com/mathieu-benoit/istio-gatekeeper-demos
    revision: HEAD
    branch: main
    dir: policies
    auth: none
EOF

This RootSync will sync the manifests contained in the policies folder. This folder contains the Constraints and ConstraintTemplates as well as the Gatekeeper config (referential-constraints-config.yaml) in order to evaluate the referential constraints.

Wait for the RootSync to be synced:

kubectl get rootsync -A

NAMESPACE                  NAME                 RENDERINGCOMMIT                            RENDERINGERRORCOUNT   SOURCECOMMIT                               SOURCEERRORCOUNT   SYNCCOMMIT                                 SYNCERRORCOUNT
config-management-system   root-sync-apps       82b96a9a1a70646c3251ec8edbe5274a4ab14f73                         82b96a9a1a70646c3251ec8edbe5274a4ab14f73                      82b96a9a1a70646c3251ec8edbe5274a4ab14f73   
config-management-system   root-sync-policies   82b96a9a1a70646c3251ec8edbe5274a4ab14f73                         82b96a9a1a70646c3251ec8edbe5274a4ab14f73                      82b96a9a1a70646c3251ec8edbe5274a4ab14f73

Verify that the ConstraintTemplates have been deployed successfully:

kubectl get constrainttemplates

Output similar to:

NAME                         AGE
allowedserviceportname       115s
authzpolicydefaultdeny       115s
destinationruletlsenabled    115s
k8srequiredlabels            115s
peerauthnmeshstrictmtls      115s
peerauthnstrictmtls          115s
sidecarinjectionannotation   115s

Verify that the Constraints has been deployed successfully:

kubectl get constraints

Output similar to:

NAME                                                                                ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
sidecarinjectionannotation.constraints.gatekeeper.sh/sidecar-injection-annotation   deny                 0

NAME                                                                            ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
k8srequiredlabels.constraints.gatekeeper.sh/namespace-sidecar-injection-label   deny                 0

NAME                                                                    ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
allowedserviceportname.constraints.gatekeeper.sh/port-name-constraint   deny                 0

NAME                                                                                   ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
authzpolicydefaultdeny.constraints.gatekeeper.sh/default-deny-authorization-policies   dryrun               1

NAME                                                                       ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
peerauthnmeshstrictmtls.constraints.gatekeeper.sh/mesh-level-strict-mtls   dryrun               1

NAME                                                                               ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
destinationruletlsenabled.constraints.gatekeeper.sh/destination-rule-tls-enabled   deny                 0

NAME                                                                            ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
peerauthnstrictmtls.constraints.gatekeeper.sh/peer-authentication-strict-mtls   deny                 0

In order to have peerauthnmeshstrictmtls and authzpolicydefaultdeny Constraints working, we needed to extend the default Gatekeeper config to take into account the Istio resources. See the referential-constraints-config.yaml file already synced in your cluster, for more details.

Istio sidecar injection policy enforcement

Here are the two policies previously deployed in order to guarantee that the wokloads are included in the Mesh:

K8sRequiredLabels - requires any Namespace in the mesh to contain the specific Istio sidecar proxy injection label: istio-injection with the value enabled
SidecarInjectionAnnotation - prohibits any Pod in the mesh to by-pass the Istio proxy sidecar injection

Try to create a test namespace without the required label:

kubectl create namespace test

Output similar to:

Error from server (Forbidden): admission webhook "validation.gatekeeper.sh" denied the request: [namespace-sidecar-injection-label] you must provide labels: {"istio-injection"}

`STRICT` mTLS in the Mesh policy enforcement

Here are the three policies previously deployed in order to guarantee STRICT mTLS in the Mesh:

PeerAuthnMeshStrictMtls - requires a default STRICT mTLS PeerAuthentication for the entire mesh in the istio-system namespace
PeerAuthnStrictMtls - prohibits disabling STRICT mTLS for all PeerAuthentications
DestinationRuleTLSEnabled - prohibits disabling STRICT mTLS for all hosts and host subsets in DestinationRules

Look at the violation detected for the PeerAuthnMeshStrictMtls Constraint to get more details:

kubectl get peerauthnmeshstrictmtls.constraints.gatekeeper.sh/mesh-level-strict-mtls \
    -ojsonpath='{.status.violations}' | jq

The output is similar to:

[
  {
    "enforcementAction": "dryrun",
    "kind": "Namespace",
    "message": "Root namespace <istio-system> does not have a strict mTLS PeerAuthentication",
    "name": "istio-system"
  }
]

`AuthorizationPolicies` policy enforcement

Here is the policy previously deployed in order to guarantee that the default AuthorizationPolicy in the Mesh is denying all request:

AuthzPolicyDefaultDeny - requires a default deny AuthorizationPolicy for the entire mesh in the istio-system namespace

Look at the violation detected for the AuthzPolicyDefaultDeny Constraint to get more details:

kubectl get authzpolicydefaultdeny.constraints.gatekeeper.sh/default-deny-authorization-policies \
    -ojsonpath='{.status.violations}' | jq

The output is similar to:

[
  {
    "enforcementAction": "dryrun",
    "kind": "Namespace",
    "message": "Root namespace <istio-system> does not have a default deny AuthorizationPolicy",
    "name": "istio-system"
  }
]

Fix the policies violations

Fix these violations by syncing the default deny-all AuthorizationPolicy and the default STRICT PeerAuthentication in the istio-system namespace:

cat << EOF | kubectl apply -f -
apiVersion: configsync.gke.io/v1beta1
kind: RootSync
metadata:
  name: root-sync-istio-system
  namespace: config-management-system
spec:
  sourceFormat: unstructured
  git:
    repo: https://github.com/mathieu-benoit/istio-gatekeeper-demos
    revision: HEAD
    branch: main
    dir: istio-system
    auth: none
EOF

This RootSync will sync the manifests contained in the istio-system folder.

Wait for the RootSync to be synced:

kubectl get rootsync -A

NAMESPACE                  NAME                     RENDERINGCOMMIT                            RENDERINGERRORCOUNT   SOURCECOMMIT                               SOURCEERRORCOUNT   SYNCCOMMIT                                 SYNCERRORCOUNT
config-management-system   root-sync-apps           cd74a14de51de93046b8040c217c9bd4ebafc14c                         cd74a14de51de93046b8040c217c9bd4ebafc14c                      cd74a14de51de93046b8040c217c9bd4ebafc14c   
config-management-system   root-sync-istio-system   cd74a14de51de93046b8040c217c9bd4ebafc14c                         cd74a14de51de93046b8040c217c9bd4ebafc14c                      cd74a14de51de93046b8040c217c9bd4ebafc14c   
config-management-system   root-sync-policies       cd74a14de51de93046b8040c217c9bd4ebafc14c                         cd74a14de51de93046b8040c217c9bd4ebafc14c                      cd74a14de51de93046b8040c217c9bd4ebafc14c

After a few minutes, verify that the Constraints don't have any remaining violations:

kubectl get constraints

The output is similar to:

NAME                                                                                ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
sidecarinjectionannotation.constraints.gatekeeper.sh/sidecar-injection-annotation   deny                 0

NAME                                                                            ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
k8srequiredlabels.constraints.gatekeeper.sh/namespace-sidecar-injection-label   deny                 0

NAME                                                                    ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
allowedserviceportname.constraints.gatekeeper.sh/port-name-constraint   deny                 0

NAME                                                                                   ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
authzpolicydefaultdeny.constraints.gatekeeper.sh/default-deny-authorization-policies   dryrun               0

NAME                                                                       ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
peerauthnmeshstrictmtls.constraints.gatekeeper.sh/mesh-level-strict-mtls   dryrun               0

NAME                                                                               ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
destinationruletlsenabled.constraints.gatekeeper.sh/destination-rule-tls-enabled   deny                 0

NAME                                                                            ENFORCEMENT-ACTION   TOTAL-VIOLATIONS
peerauthnstrictmtls.constraints.gatekeeper.sh/peer-authentication-strict-mtls   deny                 0

Visit the Online Boutique website from your browser, you should still see it working successfully.

Congrats! You have secured your cluster, your mesh and your Online Boutique website with STRICT mTLS and fine granular AuthorizationPolicies, while enforcing this secure setup with associated policies and Constraints!

If you are using Google Service Mesh, you could see these security features here:

Here is the summary of the RootSyncs and RepoSyncs you have configured with Config Sync:

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Demos with Config Sync

Sync the Ingress Gateway and the Online Boutique apps

Enforce policies

Istio sidecar injection policy enforcement

`STRICT` mTLS in the Mesh policy enforcement

`AuthorizationPolicies` policy enforcement

Fix the policies violations

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Demos with Config Sync

Sync the Ingress Gateway and the Online Boutique apps

Enforce policies

Istio sidecar injection policy enforcement

STRICT mTLS in the Mesh policy enforcement

AuthorizationPolicies policy enforcement

Fix the policies violations

`STRICT` mTLS in the Mesh policy enforcement

`AuthorizationPolicies` policy enforcement