feat: recover from configuration failures

src/integrationtests/java/com/aws/greengrass/integrationtests/certificateauthority/CustomCaConfigurationTest.java

@@ -18,6 +18,7 @@
 import com.aws.greengrass.clientdevices.auth.connectivity.CISShadowMonitor;
 import com.aws.greengrass.clientdevices.auth.exception.CertificateChainLoadingException;
 import com.aws.greengrass.clientdevices.auth.exception.CertificateGenerationException;
+import com.aws.greengrass.clientdevices.auth.exception.InvalidConfigurationException;
 import com.aws.greengrass.clientdevices.auth.helpers.CertificateTestHelpers;
 import com.aws.greengrass.config.Topics;
 import com.aws.greengrass.dependency.State;
@@ -52,16 +53,19 @@
 import java.net.URISyntaxException;
 import java.nio.file.Path;
 import java.security.KeyPair;
+import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
 import java.security.cert.CertificateException;
 import java.security.cert.X509Certificate;
 import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Consumer;
 
@@ -74,10 +78,12 @@
 import static org.hamcrest.Matchers.is;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.atLeastOnce;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.lenient;
 import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
@@ -128,21 +134,29 @@ void cleanup() {
         kernel.shutdown();
     }
 
-    // TODO: Consolidate this test helpers with ClientDevicesAuthServiceTest
-    private void givenNucleusRunningWithConfig(String configFileName) throws InterruptedException {
+    private void givenNucleusRunningWithConfig(String configFileName, Consumer<State> consumer) throws InterruptedException {
         CountDownLatch authServiceRunning = new CountDownLatch(1);
         kernel.parseArgs("-r", rootDir.toAbsolutePath().toString(), "-i",
-                getClass().getResource(configFileName).toString());
+                Objects.requireNonNull(getClass().getResource(configFileName)).toString());
         kernel.getContext().addGlobalStateChangeListener((service, was, newState) -> {
-            if (ClientDevicesAuthService.CLIENT_DEVICES_AUTH_SERVICE_NAME.equals(service.getName()) && service.getState()
-                    .equals(State.RUNNING)) {
-                authServiceRunning.countDown();
+            if (ClientDevicesAuthService.CLIENT_DEVICES_AUTH_SERVICE_NAME.equals(service.getName())) {
+                State serviceState = service.getState();
+                consumer.accept(serviceState);
+
+                if (serviceState.equals(State.RUNNING)) {
+                    authServiceRunning.countDown();
+                }
             }
         });
         kernel.launch();
+
         assertThat(authServiceRunning.await(30L, TimeUnit.SECONDS), is(true));
     }
 
+    private void givenNucleusRunningWithConfig(String configFileName) throws InterruptedException {
+        givenNucleusRunningWithConfig(configFileName, (State s) -> {});
+    }
+
     private static Pair<X509Certificate[], KeyPair[]> givenRootAndIntermediateCA() throws NoSuchAlgorithmException,
             CertificateException,
             OperatorCreationException, CertIOException {
@@ -317,4 +331,47 @@ void GIVEN_managedCAConfiguration_WHEN_updatedToCustomCAConfiguration_THEN_serve
         CertificateUpdateEvent event = eventRef.get();
         assertTrue(CertificateTestHelpers.wasCertificateIssuedBy(intermediateCA, event.getCertificate()));
     }
+
+    @Test
+    void GIVEN_invalidConfigServiceBroken_WHEN_whenCorrected_THEN_serviceCanRecover(ExtensionContext context)
+            throws CertificateException, NoSuchAlgorithmException, OperatorCreationException, CertIOException,
+            URISyntaxException, InterruptedException, KeyLoadingException, ServiceUnavailableException,
+            CertificateChainLoadingException, ServiceLoadException, KeyStoreException {
+        ignoreExceptionOfType(context, InvalidConfigurationException.class);
+        ignoreExceptionOfType(context, URISyntaxException.class);
+        Pair<X509Certificate[], KeyPair[]> credentials = givenRootAndIntermediateCA();
+        X509Certificate[] chain = credentials.getLeft();
+        KeyPair[] certificateKeys = credentials.getRight();
+        KeyPair intermediateKeyPair = certificateKeys[0];
+
+        CountDownLatch authServiceBroken = new CountDownLatch(1);
+        CountDownLatch recoveredFromBroken = new CountDownLatch(1);
+        AtomicBoolean wasBroken = new AtomicBoolean(false);
+        Consumer<State> serviceStateChangeListener = (State s) -> {
+                if (s.equals(State.BROKEN)) {
+                    wasBroken.getAndSet(true);
+                    authServiceBroken.countDown();
+                }
+
+                if (wasBroken.get() && s.equals(State.RUNNING)) {
+                    recoveredFromBroken.countDown();
+                }
+        };
+
+
+        givenNucleusRunningWithConfig("config.yaml", serviceStateChangeListener);
+        verify(certificateStoreSpy, times(1)).setCaKeyAndCertificateChain(any(), any(), any());
+
+        // Do enough bad operations until the service goes belly up
+        givenCDAWithCustomCertificateAuthority(new URI("file:///private.key"), new URI(""));
+        assertThat(authServiceBroken.await(10L, TimeUnit.SECONDS), is(true));
+
+        //  Do the right thing
+        URI privateKeyUri = new URI("file:///private.key");
+        URI certificateUri = new URI("file:///certificate.pem");
+        when(securityServiceMock.getKeyPair(privateKeyUri, certificateUri)).thenReturn(intermediateKeyPair);
+        doReturn(chain).when(certificateStoreSpy).loadCaCertificateChain(privateKeyUri, certificateUri);
+        givenCDAWithCustomCertificateAuthority(privateKeyUri, certificateUri);
+        assertThat(recoveredFromBroken.await(10L, TimeUnit.SECONDS), is(true));
+    }
 }

src/main/java/com/aws/greengrass/clientdevices/auth/ClientDevicesAuthService.java

@@ -16,6 +16,7 @@
 import com.aws.greengrass.clientdevices.auth.configuration.GroupConfiguration;
 import com.aws.greengrass.clientdevices.auth.configuration.GroupManager;
 import com.aws.greengrass.clientdevices.auth.connectivity.CISShadowMonitor;
+import com.aws.greengrass.clientdevices.auth.exception.InvalidConfigurationException;
 import com.aws.greengrass.clientdevices.auth.infra.NetworkState;
 import com.aws.greengrass.clientdevices.auth.session.MqttSessionFactory;
 import com.aws.greengrass.clientdevices.auth.session.SessionConfig;
@@ -26,6 +27,7 @@
 import com.aws.greengrass.config.Topics;
 import com.aws.greengrass.config.WhatHappened;
 import com.aws.greengrass.dependency.ImplementsService;
+import com.aws.greengrass.dependency.State;
 import com.aws.greengrass.ipc.AuthorizeClientDeviceActionOperationHandler;
 import com.aws.greengrass.ipc.GetClientDeviceAuthTokenOperationHandler;
 import com.aws.greengrass.ipc.SubscribeToCertificateUpdatesOperationHandler;
@@ -71,6 +73,7 @@ public class ClientDevicesAuthService extends PluginService {
     private ThreadPoolExecutor cloudCallThreadPool;
     private int cloudCallQueueSize;
     private CDAConfiguration cdaConfiguration;
+    private boolean configurationErrored = false;
 
 
     /**
@@ -136,9 +139,31 @@ private void subscribeToConfigChanges() {
     }
 
     private void onConfigurationChanged() {
+        // Note: The nucleus emits multiple configuration changed events, one per key that changed. It will also
+        // keep emitting them regardless of the state it is current in. If the configuration was incorrect, we want the
+        // service to error, but we don't want to check again until the nucleus has run the remediation steps (when the
+        // service errors, the nucleus will try to call shutdown -> install -> startup).
+        if (configurationErrored && !inState(State.BROKEN)) {
+            return;
+        }
+
         try {
-            cdaConfiguration = CDAConfiguration.from(cdaConfiguration, getConfig());
-        } catch (URISyntaxException e) {
+            CDAConfiguration configuration = CDAConfiguration.from(cdaConfiguration, getConfig());
+
+            if (configuration.isEqual(cdaConfiguration)) {
+                return;
+            }
+
+            cdaConfiguration = configuration;
+
+            // Good configuration and was previously broken
+            if (inState(State.BROKEN)) {
+                logger.info("Service is {} and configuration changed. Attempting to reinstall.", State.BROKEN);
+                configurationErrored = false;
+                requestReinstall();
+            }
+        } catch (URISyntaxException | InvalidConfigurationException e) {
+            configurationErrored = true;
             serviceErrored(e);
         }
     }
@@ -183,6 +208,11 @@ private void configChangeHandler(WhatHappened whatHappened, Node node) {
     protected void startup() throws InterruptedException {
         context.get(CertificateManager.class).startMonitors();
         super.startup();
+
+        if (configurationErrored) {
+            configurationErrored = false;
+            onConfigurationChanged();
+        }
     }
 
     @Override

src/main/java/com/aws/greengrass/clientdevices/auth/configuration/CAConfiguration.java

@@ -6,6 +6,7 @@
 package com.aws.greengrass.clientdevices.auth.configuration;
 
 import com.aws.greengrass.clientdevices.auth.certificate.CertificateStore;
+import com.aws.greengrass.clientdevices.auth.exception.InvalidConfigurationException;
 import com.aws.greengrass.config.Topic;
 import com.aws.greengrass.config.Topics;
 import com.aws.greengrass.logging.api.Logger;
@@ -16,8 +17,10 @@
 
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.text.MessageFormat;
 import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
 import java.util.Optional;
 
 /**
@@ -60,15 +63,31 @@ private CAConfiguration(List<String> caTypes, CertificateStore.CAType caType,
      * @param configurationTopics the configuration key of the service configuration
      *
      * @throws URISyntaxException if invalid certificateUri or privateKeyUri provided.
+     * @throws InvalidConfigurationException if provided privateKeyUri but not certificateUri
      */
-    public static CAConfiguration from(Topics configurationTopics) throws URISyntaxException {
+    public static CAConfiguration from(Topics configurationTopics) throws URISyntaxException,
+            InvalidConfigurationException {
         Topics certAuthorityTopic = configurationTopics.lookupTopics(CERTIFICATE_AUTHORITY_TOPIC);
 
+        Optional<URI> privateKeyUri = getCaPrivateKeyUriFromConfiguration(certAuthorityTopic);
+        Optional<URI> certificateUri = getCaCertificateUriFromConfiguration(certAuthorityTopic);
+
+        if (privateKeyUri.isPresent() != certificateUri.isPresent()) {
+            throw new InvalidConfigurationException(
+                MessageFormat.format(
+                    "{0} and {1} must have a value. Provided {0}:{2} and {1}:{3}",
+                    CA_PRIVATE_KEY_URI, CA_CERTIFICATE_URI,
+                    privateKeyUri.orElse(new URI("")),
+                    certificateUri.orElse(new URI(""))
+                )
+            );
+        }
+
         return new CAConfiguration(
                 getCaTypeListFromConfiguration(configurationTopics),
                 getCaTypeFromConfiguration(configurationTopics),
-                getCaPrivateKeyUriFromConfiguration(certAuthorityTopic),
-                getCaCertificateUriFromConfiguration(certAuthorityTopic)
+                privateKeyUri,
+                certificateUri
         );
     }
 
@@ -145,4 +164,20 @@ private static Optional<URI> getCaCertificateUriFromConfiguration(Topics certAut
 
         return Optional.of(getUri(certificateUri));
     }
+
+    /**
+     * Checks if the CAConfiguration is equal to another.
+     *
+     * @param config  a CAConfiguration
+     */
+    public boolean isEqual(CAConfiguration config) {
+        if (config == null) {
+            return false;
+        }
+
+        return Objects.equals(config.getCertificateUri(), certificateUri)
+                && Objects.equals(config.getPrivateKeyUri(), privateKeyUri)
+                && Objects.equals(config.getCaType(), caType);
+    }
+
 }

src/main/java/com/aws/greengrass/clientdevices/auth/configuration/CDAConfiguration.java

@@ -8,12 +8,13 @@
 import com.aws.greengrass.clientdevices.auth.api.DomainEvents;
 import com.aws.greengrass.clientdevices.auth.certificate.CertificateStore;
 import com.aws.greengrass.clientdevices.auth.certificate.events.CAConfigurationChanged;
+import com.aws.greengrass.clientdevices.auth.exception.InvalidConfigurationException;
 import com.aws.greengrass.config.Topics;
+import lombok.Getter;
 
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.List;
-import java.util.Objects;
 import java.util.Optional;
 
 import static com.aws.greengrass.componentmanager.KernelConfigResolver.CONFIGURATION_CONFIG_KEY;
@@ -47,24 +48,27 @@
 public final class CDAConfiguration {
 
     private final RuntimeConfiguration runtime;
-    private final CAConfiguration ca;
+    @Getter
+    private final CAConfiguration caConfig;
     private final DomainEvents domainEvents;
 
     private CDAConfiguration(DomainEvents domainEvents, RuntimeConfiguration runtime, CAConfiguration ca) {
         this.domainEvents = domainEvents;
         this.runtime = runtime;
-        this.ca = ca;
+        this.caConfig = ca;
     }
 
     /**
-     * Creates the CDA (Client Device Auth) Service configuration. And allows it to be available in the context
-     * with the updated values
+     * Creates the CDA (Client Device Auth) Service configuration.
      *
      * @param existingConfig  an existing version of the CDAConfiguration
      * @param topics configuration topics from GG
+     *
      * @throws URISyntaxException if invalid URI inside the configuration
+     * @throws InvalidConfigurationException if a part of the configuration is invalid
      */
-    public static CDAConfiguration from(CDAConfiguration existingConfig, Topics topics) throws URISyntaxException {
+    public static CDAConfiguration from(CDAConfiguration existingConfig, Topics topics) throws URISyntaxException,
+            InvalidConfigurationException {
         Topics runtimeTopics = topics.lookupTopics(RUNTIME_STORE_NAMESPACE_TOPIC);
         Topics serviceConfiguration = topics.lookupTopics(CONFIGURATION_CONFIG_KEY);
 
@@ -85,20 +89,22 @@ public static CDAConfiguration from(CDAConfiguration existingConfig, Topics topi
      * Creates the CDA (Client Device Auth) Service configuration.
      *
      * @param topics configuration topics from GG
+     *
      * @throws URISyntaxException if invalid URI inside the configuration
+     * @throws InvalidConfigurationException if a part of the configuration is invalid
      */
-    public static CDAConfiguration from(Topics topics) throws URISyntaxException {
+    public static CDAConfiguration from(Topics topics) throws URISyntaxException, InvalidConfigurationException {
         return from(null, topics);
     }
 
     private void triggerChanges(CDAConfiguration current, CDAConfiguration prev) {
-        if (hasCAConfigurationChanged(prev)) {
+        if (prev == null || !caConfig.isEqual(prev.getCaConfig())) {
             domainEvents.emit(new CAConfigurationChanged(current));
         }
     }
 
     public boolean isUsingCustomCA() {
-        return ca.isUsingCustomCA();
+        return caConfig.isUsingCustomCA();
     }
 
     public String getCaPassphrase() {
@@ -114,30 +120,28 @@ public void updateCACertificates(List<String> caCertificates) {
     }
 
     public CertificateStore.CAType getCaType() {
-        return ca.getCaType();
+        return caConfig.getCaType();
     }
 
     public Optional<URI> getPrivateKeyUri() {
-        return ca.getPrivateKeyUri();
+        return caConfig.getPrivateKeyUri();
     }
 
     public Optional<URI> getCertificateUri() {
-        return ca.getCertificateUri();
+        return caConfig.getCertificateUri();
     }
 
     /**
-     * Verifies if the configuration for the certificateAuthority has changed, given a previous
-     * configuration.
+     * Verifies if the configuration for the certificateAuthority is equal to another CDA configuration.
      *
-     * @param config  CDAConfiguration
+     * @param configuration  CDAConfiguration
      */
-    private boolean hasCAConfigurationChanged(CDAConfiguration config) {
-        if (config == null) {
-            return true;
+    public boolean isEqual(CDAConfiguration configuration) {
+        if (configuration == null) {
+            return false;
         }
 
-        return !Objects.equals(config.getCertificateUri(), getCertificateUri())
-                || !Objects.equals(config.getPrivateKeyUri(), getPrivateKeyUri())
-                || !Objects.equals(config.getCaType(), getCaType());
+        // TODO: As we add more configurations here we should change the equality comparison.
+        return caConfig.isEqual(configuration.getCaConfig());
     }
 }