Polish "Add support for aud claim in resource server"

See gh-29084

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/resource/OAuth2ResourceServerProperties.java

@@ -19,6 +19,8 @@ package org.springframework.boot.autoconfigure.security.oauth2.resource;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.context.properties.source.InvalidConfigurationPropertyValueException;
@@ -75,7 +77,7 @@ public class OAuth2ResourceServerProperties {
 		/**
 		 * Identifies the recipients that the JWT is intended for.
 		 */
-		private String audience;
+		private List<String> audiences = new ArrayList<>();
 
 		public String getJwkSetUri() {
 			return this.jwkSetUri;
@@ -109,12 +111,12 @@ public class OAuth2ResourceServerProperties {
 			this.publicKeyLocation = publicKeyLocation;
 		}
 
-		public String getAudience() {
+		public List<String> getAudiences() {
-			return this.audience;
+			return this.audiences;
 		}
 
-		public void setAudience(String audience) {
+		public void setAudiences(List<String> audiences) {
-			this.audience = audience;
+			this.audiences = audiences;
 		}
 
 		public String readPublicKey() throws IOException {

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/resource/reactive/ReactiveOAuth2ResourceServerJwkConfiguration.java

@@ -21,7 +21,9 @@ import java.security.interfaces.RSAPublicKey;
 import java.security.spec.X509EncodedKeySpec;
 import java.util.ArrayList;
 import java.util.Base64;
+import java.util.Collections;
 import java.util.List;
+import java.util.function.Supplier;
 
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -40,13 +42,13 @@ import org.springframework.security.oauth2.jose.jws.SignatureAlgorithm;
 import org.springframework.security.oauth2.jwt.Jwt;
 import org.springframework.security.oauth2.jwt.JwtClaimNames;
 import org.springframework.security.oauth2.jwt.JwtClaimValidator;
-import org.springframework.security.oauth2.jwt.JwtIssuerValidator;
+import org.springframework.security.oauth2.jwt.JwtValidators;
-import org.springframework.security.oauth2.jwt.JwtTimestampValidator;
 import org.springframework.security.oauth2.jwt.NimbusReactiveJwtDecoder;
 import org.springframework.security.oauth2.jwt.ReactiveJwtDecoder;
 import org.springframework.security.oauth2.jwt.ReactiveJwtDecoders;
 import org.springframework.security.oauth2.jwt.SupplierReactiveJwtDecoder;
 import org.springframework.security.web.server.SecurityWebFilterChain;
+import org.springframework.util.CollectionUtils;
 
 /**
  * Configures a {@link ReactiveJwtDecoder} when a JWK Set URI, OpenID Connect Issuer URI
@@ -78,19 +80,24 @@ class ReactiveOAuth2ResourceServerJwkConfiguration {
 			NimbusReactiveJwtDecoder nimbusReactiveJwtDecoder = NimbusReactiveJwtDecoder
 					.withJwkSetUri(this.properties.getJwkSetUri())
 					.jwsAlgorithm(SignatureAlgorithm.from(this.properties.getJwsAlgorithm())).build();
-			List<OAuth2TokenValidator<Jwt>> validators = new ArrayList<>();
-			validators.add(new JwtTimestampValidator());
 			String issuerUri = this.properties.getIssuerUri();
-			if (issuerUri != null) {
+			Supplier<OAuth2TokenValidator<Jwt>> defaultValidator = (issuerUri != null)
-				validators.add(new JwtIssuerValidator(issuerUri));
+					? () -> JwtValidators.createDefaultWithIssuer(issuerUri) : JwtValidators::createDefault;
+			nimbusReactiveJwtDecoder.setJwtValidator(getValidators(defaultValidator));
+			return nimbusReactiveJwtDecoder;
 		}
-			String audience = this.properties.getAudience();
+
-			if (audience != null) {
+		private OAuth2TokenValidator<Jwt> getValidators(Supplier<OAuth2TokenValidator<Jwt>> defaultValidator) {
-				validators.add(new JwtClaimValidator<List<String>>(JwtClaimNames.AUD,
+			OAuth2TokenValidator<Jwt> defaultValidators = defaultValidator.get();
-						(aud) -> aud != null && aud.contains(audience)));
+			List<String> audiences = this.properties.getAudiences();
+			if (CollectionUtils.isEmpty(audiences)) {
+				return defaultValidators;
 			}
-			nimbusReactiveJwtDecoder.setJwtValidator(new DelegatingOAuth2TokenValidator<>(validators));
+			List<OAuth2TokenValidator<Jwt>> validators = new ArrayList<>();
-			return nimbusReactiveJwtDecoder;
+			validators.add(defaultValidators);
+			validators.add(new JwtClaimValidator<List<String>>(JwtClaimNames.AUD,
+					(aud) -> aud != null && !Collections.disjoint(aud, audiences)));
+			return new DelegatingOAuth2TokenValidator<>(validators);
 		}
 
 		@Bean
@@ -98,8 +105,10 @@ class ReactiveOAuth2ResourceServerJwkConfiguration {
 		NimbusReactiveJwtDecoder jwtDecoderByPublicKeyValue() throws Exception {
 			RSAPublicKey publicKey = (RSAPublicKey) KeyFactory.getInstance("RSA")
 					.generatePublic(new X509EncodedKeySpec(getKeySpec(this.properties.readPublicKey())));
-			return NimbusReactiveJwtDecoder.withPublicKey(publicKey)
+			NimbusReactiveJwtDecoder jwtDecoder = NimbusReactiveJwtDecoder.withPublicKey(publicKey)
 					.signatureAlgorithm(SignatureAlgorithm.from(this.properties.getJwsAlgorithm())).build();
+			jwtDecoder.setJwtValidator(getValidators(JwtValidators::createDefault));
+			return jwtDecoder;
 		}
 
 		private byte[] getKeySpec(String keyValue) {
@@ -110,8 +119,13 @@ class ReactiveOAuth2ResourceServerJwkConfiguration {
 		@Bean
 		@Conditional(IssuerUriCondition.class)
 		SupplierReactiveJwtDecoder jwtDecoderByIssuerUri() {
-			return new SupplierReactiveJwtDecoder(
+			return new SupplierReactiveJwtDecoder(() -> {
-					() -> ReactiveJwtDecoders.fromIssuerLocation(this.properties.getIssuerUri()));
+				NimbusReactiveJwtDecoder jwtDecoder = (NimbusReactiveJwtDecoder) ReactiveJwtDecoders
+						.fromIssuerLocation(this.properties.getIssuerUri());
+				jwtDecoder.setJwtValidator(
+						getValidators(() -> JwtValidators.createDefaultWithIssuer(this.properties.getIssuerUri())));
+				return jwtDecoder;
+			});
 		}
 
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/resource/servlet/OAuth2ResourceServerJwtConfiguration.java

@@ -21,7 +21,9 @@ import java.security.interfaces.RSAPublicKey;
 import java.security.spec.X509EncodedKeySpec;
 import java.util.ArrayList;
 import java.util.Base64;
+import java.util.Collections;
 import java.util.List;
+import java.util.function.Supplier;
 
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -43,11 +45,11 @@ import org.springframework.security.oauth2.jwt.JwtClaimNames;
 import org.springframework.security.oauth2.jwt.JwtClaimValidator;
 import org.springframework.security.oauth2.jwt.JwtDecoder;
 import org.springframework.security.oauth2.jwt.JwtDecoders;
-import org.springframework.security.oauth2.jwt.JwtIssuerValidator;
+import org.springframework.security.oauth2.jwt.JwtValidators;
-import org.springframework.security.oauth2.jwt.JwtTimestampValidator;
 import org.springframework.security.oauth2.jwt.NimbusJwtDecoder;
 import org.springframework.security.oauth2.jwt.SupplierJwtDecoder;
 import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.util.CollectionUtils;
 
 /**
  * Configures a {@link JwtDecoder} when a JWK Set URI, OpenID Connect Issuer URI or Public
@@ -77,19 +79,24 @@ class OAuth2ResourceServerJwtConfiguration {
 		JwtDecoder jwtDecoderByJwkKeySetUri() {
 			NimbusJwtDecoder nimbusJwtDecoder = NimbusJwtDecoder.withJwkSetUri(this.properties.getJwkSetUri())
 					.jwsAlgorithm(SignatureAlgorithm.from(this.properties.getJwsAlgorithm())).build();
-			List<OAuth2TokenValidator<Jwt>> validators = new ArrayList<>();
-			validators.add(new JwtTimestampValidator());
 			String issuerUri = this.properties.getIssuerUri();
-			if (issuerUri != null) {
+			Supplier<OAuth2TokenValidator<Jwt>> defaultValidator = (issuerUri != null)
-				validators.add(new JwtIssuerValidator(issuerUri));
+					? () -> JwtValidators.createDefaultWithIssuer(issuerUri) : JwtValidators::createDefault;
+			nimbusJwtDecoder.setJwtValidator(getValidators(defaultValidator));
+			return nimbusJwtDecoder;
 		}
-			String audience = this.properties.getAudience();
+
-			if (audience != null) {
+		private OAuth2TokenValidator<Jwt> getValidators(Supplier<OAuth2TokenValidator<Jwt>> defaultValidator) {
-				validators.add(new JwtClaimValidator<List<String>>(JwtClaimNames.AUD,
+			OAuth2TokenValidator<Jwt> defaultValidators = defaultValidator.get();
-						(aud) -> aud != null && aud.contains(audience)));
+			List<String> audiences = this.properties.getAudiences();
+			if (CollectionUtils.isEmpty(audiences)) {
+				return defaultValidators;
 			}
-			nimbusJwtDecoder.setJwtValidator(new DelegatingOAuth2TokenValidator<>(validators));
+			List<OAuth2TokenValidator<Jwt>> validators = new ArrayList<>();
-			return nimbusJwtDecoder;
+			validators.add(defaultValidators);
+			validators.add(new JwtClaimValidator<List<String>>(JwtClaimNames.AUD,
+					(aud) -> aud != null && !Collections.disjoint(aud, audiences)));
+			return new DelegatingOAuth2TokenValidator<>(validators);
 		}
 
 		@Bean
@@ -97,8 +104,10 @@ class OAuth2ResourceServerJwtConfiguration {
 		JwtDecoder jwtDecoderByPublicKeyValue() throws Exception {
 			RSAPublicKey publicKey = (RSAPublicKey) KeyFactory.getInstance("RSA")
 					.generatePublic(new X509EncodedKeySpec(getKeySpec(this.properties.readPublicKey())));
-			return NimbusJwtDecoder.withPublicKey(publicKey)
+			NimbusJwtDecoder jwtDecoder = NimbusJwtDecoder.withPublicKey(publicKey)
 					.signatureAlgorithm(SignatureAlgorithm.from(this.properties.getJwsAlgorithm())).build();
+			jwtDecoder.setJwtValidator(getValidators(JwtValidators::createDefault));
+			return jwtDecoder;
 		}
 
 		private byte[] getKeySpec(String keyValue) {
@@ -109,7 +118,12 @@ class OAuth2ResourceServerJwtConfiguration {
 		@Bean
 		@Conditional(IssuerUriCondition.class)
 		SupplierJwtDecoder jwtDecoderByIssuerUri() {
-			return new SupplierJwtDecoder(() -> JwtDecoders.fromIssuerLocation(this.properties.getIssuerUri()));
+			return new SupplierJwtDecoder(() -> {
+				String issuerUri = this.properties.getIssuerUri();
+				NimbusJwtDecoder jwtDecoder = JwtDecoders.fromIssuerLocation(issuerUri);
+				jwtDecoder.setJwtValidator(getValidators(() -> JwtValidators.createDefaultWithIssuer(issuerUri)));
+				return jwtDecoder;
+			});
 		}
 
 	}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/oauth2/resource/reactive/ReactiveOAuth2ResourceServerAutoConfigurationTests.java

@@ -17,6 +17,9 @@
 package org.springframework.boot.autoconfigure.security.oauth2.resource.reactive;
 
 import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.time.Instant;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
@@ -423,20 +426,108 @@ class ReactiveOAuth2ResourceServerAutoConfigurationTests {
 		String issuer = this.server.url(path).toString();
 		String cleanIssuerPath = cleanIssuerPath(issuer);
 		setupMockResponse(cleanIssuerPath);
-		this.contextRunner
+		String issuerUri = "http://" + this.server.getHostName() + ":" + this.server.getPort() + "/" + path;
-				.withPropertyValues("spring.security.oauth2.resourceserver.jwt.jwk-set-uri=https://jwk-set-uri.com",
+		this.contextRunner.withPropertyValues(
-						"spring.security.oauth2.resourceserver.jwt.issuer-uri=http://" + this.server.getHostName() + ":"
+				"spring.security.oauth2.resourceserver.jwt.jwk-set-uri=https://jwk-set-uri.com",
-								+ this.server.getPort() + "/" + path,
+				"spring.security.oauth2.resourceserver.jwt.issuer-uri=" + issuerUri,
-						"spring.security.oauth2.resourceserver.jwt.audience=http://test-audience.com")
+				"spring.security.oauth2.resourceserver.jwt.audiences=https://test-audience.com,https://test-audience1.com")
 				.run((context) -> {
 					assertThat(context).hasSingleBean(ReactiveJwtDecoder.class);
 					ReactiveJwtDecoder reactiveJwtDecoder = context.getBean(ReactiveJwtDecoder.class);
+					validate(issuerUri, reactiveJwtDecoder);
+				});
+	}
+
+	@SuppressWarnings("unchecked")
+	private void validate(String issuerUri, ReactiveJwtDecoder jwtDecoder) throws MalformedURLException {
 		DelegatingOAuth2TokenValidator<Jwt> jwtValidator = (DelegatingOAuth2TokenValidator<Jwt>) ReflectionTestUtils
-							.getField(reactiveJwtDecoder, "jwtValidator");
+				.getField(jwtDecoder, "jwtValidator");
-					Collection<OAuth2TokenValidator<Jwt>> tokenValidators = (Collection<OAuth2TokenValidator<Jwt>>) ReflectionTestUtils
+		Jwt.Builder builder = jwt().claim("aud", Collections.singletonList("https://test-audience.com"));
+		if (issuerUri != null) {
+			builder.claim("iss", new URL(issuerUri));
+		}
+		Jwt jwt = builder.build();
+		assertThat(jwtValidator.validate(jwt).hasErrors()).isFalse();
+		Collection<OAuth2TokenValidator<Jwt>> delegates = (Collection<OAuth2TokenValidator<Jwt>>) ReflectionTestUtils
 				.getField(jwtValidator, "tokenValidators");
-					assertThat(tokenValidators).hasAtLeastOneElementOfType(JwtIssuerValidator.class);
+		validateDelegates(issuerUri, delegates);
-					assertThat(tokenValidators).hasAtLeastOneElementOfType(JwtClaimValidator.class);
+	}
+
+	@SuppressWarnings("unchecked")
+	private void validateDelegates(String issuerUri, Collection<OAuth2TokenValidator<Jwt>> delegates) {
+		assertThat(delegates).hasAtLeastOneElementOfType(JwtClaimValidator.class);
+		OAuth2TokenValidator<Jwt> delegatingValidator = delegates.stream()
+				.filter((v) -> v instanceof DelegatingOAuth2TokenValidator).findFirst().get();
+		Collection<OAuth2TokenValidator<Jwt>> nestedDelegates = (Collection<OAuth2TokenValidator<Jwt>>) ReflectionTestUtils
+				.getField(delegatingValidator, "tokenValidators");
+		if (issuerUri != null) {
+			assertThat(nestedDelegates).hasAtLeastOneElementOfType(JwtIssuerValidator.class);
+		}
+	}
+
+	@SuppressWarnings("unchecked")
+	@Test
+	void autoConfigurationShouldConfigureAudienceValidatorIfPropertyProvidedAndIssuerUri() throws Exception {
+		this.server = new MockWebServer();
+		this.server.start();
+		String path = "test";
+		String issuer = this.server.url(path).toString();
+		String cleanIssuerPath = cleanIssuerPath(issuer);
+		setupMockResponse(cleanIssuerPath);
+		String issuerUri = "http://" + this.server.getHostName() + ":" + this.server.getPort() + "/" + path;
+		this.contextRunner.withPropertyValues("spring.security.oauth2.resourceserver.jwt.issuer-uri=" + issuerUri,
+				"spring.security.oauth2.resourceserver.jwt.audiences=https://test-audience.com,https://test-audience1.com")
+				.run((context) -> {
+					SupplierReactiveJwtDecoder supplierJwtDecoderBean = context
+							.getBean(SupplierReactiveJwtDecoder.class);
+					Mono<ReactiveJwtDecoder> jwtDecoderSupplier = (Mono<ReactiveJwtDecoder>) ReflectionTestUtils
+							.getField(supplierJwtDecoderBean, "jwtDecoderMono");
+					ReactiveJwtDecoder jwtDecoder = jwtDecoderSupplier.block();
+					validate(issuerUri, jwtDecoder);
+				});
+	}
+
+	@SuppressWarnings("unchecked")
+	@Test
+	void autoConfigurationShouldConfigureAudienceValidatorIfPropertyProvidedAndPublicKey() throws Exception {
+		this.server = new MockWebServer();
+		this.server.start();
+		String path = "test";
+		String issuer = this.server.url(path).toString();
+		String cleanIssuerPath = cleanIssuerPath(issuer);
+		setupMockResponse(cleanIssuerPath);
+		this.contextRunner.withPropertyValues(
+				"spring.security.oauth2.resourceserver.jwt.public-key-location=classpath:public-key-location",
+				"spring.security.oauth2.resourceserver.jwt.audiences=https://test-audience.com,https://test-audience1.com")
+				.run((context) -> {
+					assertThat(context).hasSingleBean(ReactiveJwtDecoder.class);
+					ReactiveJwtDecoder jwtDecoder = context.getBean(ReactiveJwtDecoder.class);
+					validate(null, jwtDecoder);
+				});
+	}
+
+	@SuppressWarnings("unchecked")
+	@Test
+	void audienceValidatorWhenAudienceInvalid() throws Exception {
+		this.server = new MockWebServer();
+		this.server.start();
+		String path = "test";
+		String issuer = this.server.url(path).toString();
+		String cleanIssuerPath = cleanIssuerPath(issuer);
+		setupMockResponse(cleanIssuerPath);
+		String issuerUri = "http://" + this.server.getHostName() + ":" + this.server.getPort() + "/" + path;
+		this.contextRunner.withPropertyValues(
+				"spring.security.oauth2.resourceserver.jwt.jwk-set-uri=https://jwk-set-uri.com",
+				"spring.security.oauth2.resourceserver.jwt.issuer-uri=" + issuerUri,
+				"spring.security.oauth2.resourceserver.jwt.audiences=https://test-audience.com,https://test-audience1.com")
+				.run((context) -> {
+					assertThat(context).hasSingleBean(ReactiveJwtDecoder.class);
+					ReactiveJwtDecoder jwtDecoder = context.getBean(ReactiveJwtDecoder.class);
+					DelegatingOAuth2TokenValidator<Jwt> jwtValidator = (DelegatingOAuth2TokenValidator<Jwt>) ReflectionTestUtils
+							.getField(jwtDecoder, "jwtValidator");
+					Jwt jwt = jwt().claim("iss", new URL(issuerUri))
+							.claim("aud", Collections.singletonList("https://other-audience.com")).build();
+					assertThat(jwtValidator.validate(jwt).hasErrors()).isTrue();
 				});
 	}
 
@@ -508,6 +599,19 @@ class ReactiveOAuth2ResourceServerAutoConfigurationTests {
 		return response;
 	}
 
+	static Jwt.Builder jwt() {
+		// @formatter:off
+		return Jwt.withTokenValue("token")
+				.header("alg", "none")
+				.expiresAt(Instant.MAX)
+				.issuedAt(Instant.MIN)
+				.issuer("https://issuer.example.org")
+				.jti("jti")
+				.notBefore(Instant.MIN)
+				.subject("mock-test-subject");
+		// @formatter:on
+	}
+
 	@EnableWebFluxSecurity
 	static class TestConfig {
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/oauth2/resource/servlet/OAuth2ResourceServerAutoConfigurationTests.java

@@ -16,6 +16,9 @@
 
 package org.springframework.boot.autoconfigure.security.oauth2.resource.servlet;
 
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.time.Instant;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
@@ -440,20 +443,107 @@ class OAuth2ResourceServerAutoConfigurationTests {
 		String issuer = this.server.url(path).toString();
 		String cleanIssuerPath = cleanIssuerPath(issuer);
 		setupMockResponse(cleanIssuerPath);
-		this.contextRunner
+		String issuerUri = "http://" + this.server.getHostName() + ":" + this.server.getPort() + "/" + path;
-				.withPropertyValues("spring.security.oauth2.resourceserver.jwt.jwk-set-uri=https://jwk-set-uri.com",
+		this.contextRunner.withPropertyValues(
-						"spring.security.oauth2.resourceserver.jwt.issuer-uri=http://" + this.server.getHostName() + ":"
+				"spring.security.oauth2.resourceserver.jwt.jwk-set-uri=https://jwk-set-uri.com",
-								+ this.server.getPort() + "/" + path,
+				"spring.security.oauth2.resourceserver.jwt.issuer-uri=" + issuerUri,
-						"spring.security.oauth2.resourceserver.jwt.audience=http://test-audience.com")
+				"spring.security.oauth2.resourceserver.jwt.audiences=https://test-audience.com,https://test-audience1.com")
 				.run((context) -> {
 					assertThat(context).hasSingleBean(JwtDecoder.class);
 					JwtDecoder jwtDecoder = context.getBean(JwtDecoder.class);
+					validate(issuerUri, jwtDecoder);
+				});
+	}
+
+	@SuppressWarnings("unchecked")
+	@Test
+	void autoConfigurationShouldConfigureAudienceValidatorIfPropertyProvidedAndIssuerUri() throws Exception {
+		this.server = new MockWebServer();
+		this.server.start();
+		String path = "test";
+		String issuer = this.server.url(path).toString();
+		String cleanIssuerPath = cleanIssuerPath(issuer);
+		setupMockResponse(cleanIssuerPath);
+		String issuerUri = "http://" + this.server.getHostName() + ":" + this.server.getPort() + "/" + path;
+		this.contextRunner.withPropertyValues("spring.security.oauth2.resourceserver.jwt.issuer-uri=" + issuerUri,
+				"spring.security.oauth2.resourceserver.jwt.audiences=https://test-audience.com,https://test-audience1.com")
+				.run((context) -> {
+					SupplierJwtDecoder supplierJwtDecoderBean = context.getBean(SupplierJwtDecoder.class);
+					Supplier<JwtDecoder> jwtDecoderSupplier = (Supplier<JwtDecoder>) ReflectionTestUtils
+							.getField(supplierJwtDecoderBean, "jwtDecoderSupplier");
+					JwtDecoder jwtDecoder = jwtDecoderSupplier.get();
+					validate(issuerUri, jwtDecoder);
+				});
+	}
+
+	@SuppressWarnings("unchecked")
+	private void validate(String issuerUri, JwtDecoder jwtDecoder) throws MalformedURLException {
 		DelegatingOAuth2TokenValidator<Jwt> jwtValidator = (DelegatingOAuth2TokenValidator<Jwt>) ReflectionTestUtils
 				.getField(jwtDecoder, "jwtValidator");
-					Collection<OAuth2TokenValidator<Jwt>> tokenValidators = (Collection<OAuth2TokenValidator<Jwt>>) ReflectionTestUtils
+		Jwt.Builder builder = jwt().claim("aud", Collections.singletonList("https://test-audience.com"));
+		if (issuerUri != null) {
+			builder.claim("iss", new URL(issuerUri));
+		}
+		Jwt jwt = builder.build();
+		assertThat(jwtValidator.validate(jwt).hasErrors()).isFalse();
+		Collection<OAuth2TokenValidator<Jwt>> delegates = (Collection<OAuth2TokenValidator<Jwt>>) ReflectionTestUtils
 				.getField(jwtValidator, "tokenValidators");
-					assertThat(tokenValidators).hasAtLeastOneElementOfType(JwtIssuerValidator.class);
+		validateDelegates(issuerUri, delegates);
-					assertThat(tokenValidators).hasAtLeastOneElementOfType(JwtClaimValidator.class);
+	}
+
+	@SuppressWarnings("unchecked")
+	private void validateDelegates(String issuerUri, Collection<OAuth2TokenValidator<Jwt>> delegates) {
+		assertThat(delegates).hasAtLeastOneElementOfType(JwtClaimValidator.class);
+		OAuth2TokenValidator<Jwt> delegatingValidator = delegates.stream()
+				.filter((v) -> v instanceof DelegatingOAuth2TokenValidator).findFirst().get();
+		Collection<OAuth2TokenValidator<Jwt>> nestedDelegates = (Collection<OAuth2TokenValidator<Jwt>>) ReflectionTestUtils
+				.getField(delegatingValidator, "tokenValidators");
+		if (issuerUri != null) {
+			assertThat(nestedDelegates).hasAtLeastOneElementOfType(JwtIssuerValidator.class);
+		}
+	}
+
+	@SuppressWarnings("unchecked")
+	@Test
+	void autoConfigurationShouldConfigureAudienceValidatorIfPropertyProvidedAndPublicKey() throws Exception {
+		this.server = new MockWebServer();
+		this.server.start();
+		String path = "test";
+		String issuer = this.server.url(path).toString();
+		String cleanIssuerPath = cleanIssuerPath(issuer);
+		setupMockResponse(cleanIssuerPath);
+		this.contextRunner.withPropertyValues(
+				"spring.security.oauth2.resourceserver.jwt.public-key-location=classpath:public-key-location",
+				"spring.security.oauth2.resourceserver.jwt.audiences=https://test-audience.com,http://test-audience1.com")
+				.run((context) -> {
+					assertThat(context).hasSingleBean(JwtDecoder.class);
+					JwtDecoder jwtDecoder = context.getBean(JwtDecoder.class);
+					validate(null, jwtDecoder);
+				});
+	}
+
+	@SuppressWarnings("unchecked")
+	@Test
+	void audienceValidatorWhenAudienceInvalid() throws Exception {
+		this.server = new MockWebServer();
+		this.server.start();
+		String path = "test";
+		String issuer = this.server.url(path).toString();
+		String cleanIssuerPath = cleanIssuerPath(issuer);
+		setupMockResponse(cleanIssuerPath);
+		String issuerUri = "http://" + this.server.getHostName() + ":" + this.server.getPort() + "/" + path;
+		this.contextRunner.withPropertyValues(
+				"spring.security.oauth2.resourceserver.jwt.jwk-set-uri=https://jwk-set-uri.com",
+				"spring.security.oauth2.resourceserver.jwt.issuer-uri=" + issuerUri,
+				"spring.security.oauth2.resourceserver.jwt.audiences=https://test-audience.com,https://test-audience1.com")
+				.run((context) -> {
+					assertThat(context).hasSingleBean(JwtDecoder.class);
+					JwtDecoder jwtDecoder = context.getBean(JwtDecoder.class);
+					DelegatingOAuth2TokenValidator<Jwt> jwtValidator = (DelegatingOAuth2TokenValidator<Jwt>) ReflectionTestUtils
+							.getField(jwtDecoder, "jwtValidator");
+					Jwt jwt = jwt().claim("iss", new URL(issuerUri))
+							.claim("aud", Collections.singletonList("https://other-audience.com")).build();
+					assertThat(jwtValidator.validate(jwt).hasErrors()).isTrue();
 				});
 	}
 
@@ -525,6 +615,19 @@ class OAuth2ResourceServerAutoConfigurationTests {
 		return response;
 	}
 
+	static Jwt.Builder jwt() {
+		// @formatter:off
+		return Jwt.withTokenValue("token")
+				.header("alg", "none")
+				.expiresAt(Instant.MAX)
+				.issuedAt(Instant.MIN)
+				.issuer("https://issuer.example.org")
+				.jti("jti")
+				.notBefore(Instant.MIN)
+				.subject("mock-test-subject");
+		// @formatter:on
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	@EnableWebSecurity
 	static class TestConfig {