Merge pull request #437 from tony-clarke-amdocs/ssl-trust

Create a trust manager backed by known trusted X509 certificates

docs/src/main/asciidoc/spring-cloud-gateway.adoc

@@ -905,6 +905,50 @@ or check if an exchange has already been routed.
 * `ServerWebExchangeUtils.isAlreadyRouted` takes a `ServerWebExchange` object and checks if it has been "routed"
 * `ServerWebExchangeUtils.setAlreadyRouted` takes a `ServerWebExchange` object and marks it as "routed"
 
+== TLS / SSL
+The Gateway can listen for requests on https by following the usual Spring server configuration. Example:
+
+.application.yml
+[source,yaml]
+----
+server:
+  ssl:
+    enabled: true
+    key-alias: scg
+    key-store-password: scg1234
+    key-store: classpath:scg-keystore.p12
+    key-store-type: PKCS12
+----
+
+Gateway routes can be routed to both http and https backends. If routing to a https backend then the Gateway can be configured to trust all downstream certificates with the following configuration:
+
+.application.yml
+[source,yaml]
+----
+spring:
+  cloud:
+    gateway:
+      httpclient:
+        ssl:
+          useInsecureTrustManager: true
+----
+
+Using an insecure trust manager is not suitable for production. For a production deployment the Gateway can be configured with a set of known certificates that it can trust with the follwing configuration:
+
+.application.yml
+[source,yaml]
+----
+spring:
+  cloud:
+    gateway:
+      httpclient:
+        ssl:
+          trustedX509Certificates:
+          - cert1.pem
+          - cert2.pem
+----
+
+
 == Configuration
 
 Configuration for Spring Cloud Gateway is driven by a collection of `RouteDefinitionLocator`s.

spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/config/GatewayAutoConfiguration.java

@@ -17,6 +17,12 @@
 
 package org.springframework.cloud.gateway.config;
 
+import java.io.IOException;
+import java.net.URL;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Consumer;
 
@@ -45,6 +51,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.context.properties.PropertyMapper;
+import org.springframework.boot.web.server.WebServerException;
 import org.springframework.cloud.gateway.actuate.GatewayControllerEndpoint;
 import org.springframework.cloud.gateway.filter.AdaptCachedBodyGlobalFilter;
 import org.springframework.cloud.gateway.filter.ForwardPathFilter;
@@ -121,6 +128,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.DependsOn;
 import org.springframework.context.annotation.Primary;
 import org.springframework.http.codec.ServerCodecConfigurer;
+import org.springframework.util.ResourceUtils;
 import org.springframework.util.StringUtils;
 import org.springframework.validation.Validator;
 import org.springframework.web.reactive.DispatcherHandler;
@@ -162,10 +170,17 @@ public class GatewayAutoConfiguration {
 
 				// configure ssl
 				HttpClientProperties.Ssl ssl = properties.getSsl();
-
-				if (ssl.isUseInsecureTrustManager()) {
+				X509Certificate[] trustedX509Certificates = ssl
+						.getTrustedX509CertificatesForTrustManager();
+				if (trustedX509Certificates.length > 0) {
 					opts.sslSupport(sslContextBuilder -> {
-						sslContextBuilder.trustManager(InsecureTrustManagerFactory.INSTANCE);
+						sslContextBuilder.trustManager(trustedX509Certificates);
+					});
+				}
+				else if (ssl.isUseInsecureTrustManager()) {
+					opts.sslSupport(sslContextBuilder -> {
+						sslContextBuilder
+								.trustManager(InsecureTrustManagerFactory.INSTANCE);
 					});
 				}
 

spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/config/HttpClientProperties.java

@@ -18,9 +18,19 @@
 package org.springframework.cloud.gateway.config;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.web.server.WebServerException;
+import org.springframework.util.ResourceUtils;
+
 import reactor.ipc.netty.resources.PoolResources;
 
+import java.io.IOException;
+import java.net.URL;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
 import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Configuration properties for the Netty {@link reactor.ipc.netty.http.client.HttpClient}
@@ -210,6 +220,41 @@ public class HttpClientProperties {
 	public class Ssl {
 		/** Installs the netty InsecureTrustManagerFactory. This is insecure and not suitable for production. */
 		private boolean useInsecureTrustManager = false;
+		
+		private List<String> trustedX509Certificates = new ArrayList<>();
+
+		public List<String> getTrustedX509Certificates() {
+			return trustedX509Certificates;
+		}
+		
+		public X509Certificate[] getTrustedX509CertificatesForTrustManager() {
+			try {
+				CertificateFactory certificateFactory = CertificateFactory
+						.getInstance("X.509");
+				ArrayList<X509Certificate> certs = new ArrayList<>();
+				for (String trustedCert : ssl.getTrustedX509Certificates()) {
+					try {
+						URL url = ResourceUtils.getURL(trustedCert);
+						X509Certificate cert = (X509Certificate) certificateFactory
+								.generateCertificate(url.openStream());
+						certs.add(cert);
+					}
+					catch (IOException e) {
+						throw new WebServerException(
+								"Could not load certificate '" + trustedCert + "'", e);
+					}
+				}
+				return certs.toArray(new X509Certificate[certs.size()]);
+			}
+			catch (CertificateException e1) {
+				throw new WebServerException("Could not load CertificateFactory X.509",
+						e1);
+			}
+		}
+
+		public void setTrustedX509Certificates(List<String> trustedX509) {
+			this.trustedX509Certificates = trustedX509;
+		}
 
 		//TODO: support configuration of other trust manager factories
 
@@ -223,9 +268,8 @@ public class HttpClientProperties {
 
 		@Override
 		public String toString() {
-			return "Ssl{" +
-					"useInsecureTrustManager=" + useInsecureTrustManager +
-					'}';
+			return "Ssl {useInsecureTrustManager=" + useInsecureTrustManager
+					+ ", trustedX509Certificates=" + trustedX509Certificates + "}";
 		}
 	}
 

spring-cloud-gateway-core/src/test/java/org/springframework/cloud/gateway/test/ssl/SSLTests.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2013-2017 the original author or 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 org.springframework.cloud.gateway.test.ssl;
+
+import static org.junit.Assert.assertTrue;
+import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
+
+import javax.net.ssl.SSLException;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.cloud.gateway.test.BaseWebClientTests;
+import org.springframework.context.annotation.Import;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.client.reactive.ClientHttpConnector;
+import org.springframework.http.client.reactive.ReactorClientHttpConnector;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.reactive.function.client.ClientResponse;
+import org.springframework.web.reactive.function.client.WebClient;
+
+import io.netty.handler.ssl.SslContext;
+import io.netty.handler.ssl.SslContextBuilder;
+import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = RANDOM_PORT)
+@DirtiesContext
+@ActiveProfiles("ssl")
+public class SSLTests extends BaseWebClientTests {
+
+	@Before
+	public void setup() {
+		try {
+			SslContext sslContext = SslContextBuilder.forClient()
+					.trustManager(InsecureTrustManagerFactory.INSTANCE).build();
+			ClientHttpConnector httpConnector = new ReactorClientHttpConnector(
+					opt -> opt.sslContext(sslContext));
+			baseUri = "https://localhost:" + port;
+			this.webClient = WebClient.builder().clientConnector(httpConnector)
+					.baseUrl(baseUri).build();
+		}
+		catch (SSLException e) {
+			throw new RuntimeException(e);
+		}		
+	}
+	
+	@Test
+	public void testSslTrust() {
+		ClientResponse clientResponse = webClient.get().uri("/ssltrust")
+				.exchange().block();
+		HttpStatus statusCode = clientResponse.statusCode();
+		assertTrue(statusCode.is2xxSuccessful());
+				
+	}
+
+	@EnableAutoConfiguration
+	@SpringBootConfiguration
+	@Import(DefaultTestConfig.class)
+	@RestController
+	public static class TestConfig {
+
+		@RequestMapping("/httpbin/ssltrust")
+		public ResponseEntity<Void> nocontenttype() {
+			return ResponseEntity.status(204).build();
+		}
+
+	}
+
+}

spring-cloud-gateway-core/src/test/resources/application-ssl.yml

@@ -0,0 +1,38 @@
+test:
+  hostport: httpbin.org:80
+  uri: lb://testservice
+
+server:
+  ssl:
+    enabled: true
+    key-alias: scg
+    key-store-password: scg1234
+    key-store: classpath:scg-keystore.p12
+    key-store-type: PKCS12
+
+spring:
+  cloud:
+    gateway:
+      httpclient:
+        ssl:
+          trustedX509Certificates:
+          - src/test/resources/scg-cert.pem
+      default-filters:
+      - PrefixPath=/httpbin
+      routes:
+      - id: default_path_to_httpbin
+        uri: ${test.uri}
+        order: 10000
+        predicates:
+        - name: Path
+          args:
+            pattern: /**
+
+logging:
+  level:
+    org.springframework.cloud.gateway: TRACE
+    org.springframework.http.server.reactive: DEBUG
+    org.springframework.web.reactive: DEBUG
+    reactor.ipc.netty: DEBUG
+    redisratelimiter: DEBUG
+

spring-cloud-gateway-core/src/test/resources/scg-cert.pem

@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE-----
+MIIEjTCCAvWgAwIBAgIEIZEBKTANBgkqhkiG9w0BAQwFADBsMRAwDgYDVQQGEwdV
+bmtub3duMRAwDgYDVQQIEwdVbmtub3duMRAwDgYDVQQHEwdVbmtub3duMRAwDgYD
+VQQKEwdVbmtub3duMRAwDgYDVQQLEwdVbmtub3duMRAwDgYDVQQDEwdVbmtub3du
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+uBEOipAkUqH6y+lI/lJ72MrXpkxbkAq2fYffZK4e6KNpKG7pP0txEkwNvosKSAjA
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+10719GizKXQW2Mx/8XOr1Ow=
+-----END CERTIFICATE-----