Use PasswordEncoder in OAuth2ClientAuthenticationProvider

Closes gh-271

oauth2-authorization-server/src/main/java/org/springframework/security/config/annotation/web/configurers/oauth2/server/authorization/OAuth2AuthorizationServerConfigurer.java

@@ -32,6 +32,7 @@ import org.springframework.security.authentication.AuthenticationManager;
 import org.springframework.security.config.annotation.web.HttpSecurityBuilder;
 import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
 import org.springframework.security.config.annotation.web.configurers.ExceptionHandlingConfigurer;
+import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.security.oauth2.jwt.JwtEncoder;
 import org.springframework.security.oauth2.jwt.NimbusJwsEncoder;
 import org.springframework.security.oauth2.server.authorization.InMemoryOAuth2AuthorizationService;
@@ -158,10 +159,14 @@ public final class OAuth2AuthorizationServerConfigurer<B extends HttpSecurityBui
 		validateProviderSettings(providerSettings);
 		initEndpointMatchers(providerSettings);
 
+		PasswordEncoder passwordEncoder = getOptionalBean(builder, PasswordEncoder.class);
 		OAuth2ClientAuthenticationProvider clientAuthenticationProvider =
 				new OAuth2ClientAuthenticationProvider(
 						getRegisteredClientRepository(builder),
 						getAuthorizationService(builder));
+		if (passwordEncoder != null) {
+			clientAuthenticationProvider.setPasswordEncoder(passwordEncoder);
+		}
 		builder.authenticationProvider(postProcess(clientAuthenticationProvider));
 
 		JwtEncoder jwtEncoder = getJwtEncoder(builder);

oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/server/authorization/authentication/OAuth2ClientAuthenticationProvider.java

@@ -24,6 +24,8 @@ import java.util.Map;
 import org.springframework.security.authentication.AuthenticationProvider;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.crypto.factory.PasswordEncoderFactories;
+import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.security.oauth2.core.AuthorizationGrantType;
 import org.springframework.security.oauth2.core.OAuth2AuthenticationException;
 import org.springframework.security.oauth2.core.OAuth2Error;
@@ -56,6 +58,7 @@ public class OAuth2ClientAuthenticationProvider implements AuthenticationProvide
 	private static final OAuth2TokenType AUTHORIZATION_CODE_TOKEN_TYPE = new OAuth2TokenType(OAuth2ParameterNames.CODE);
 	private final RegisteredClientRepository registeredClientRepository;
 	private final OAuth2AuthorizationService authorizationService;
+	private PasswordEncoder passwordEncoder;
 
 	/**
 	 * Constructs an {@code OAuth2ClientAuthenticationProvider} using the provided parameters.
@@ -69,6 +72,12 @@ public class OAuth2ClientAuthenticationProvider implements AuthenticationProvide
 		Assert.notNull(authorizationService, "authorizationService cannot be null");
 		this.registeredClientRepository = registeredClientRepository;
 		this.authorizationService = authorizationService;
+		this.passwordEncoder = PasswordEncoderFactories.createDelegatingPasswordEncoder();
+	}
+
+	public void setPasswordEncoder(PasswordEncoder passwordEncoder) {
+		Assert.notNull(passwordEncoder, "passwordEncoder cannot be null");
+		this.passwordEncoder = passwordEncoder;
 	}
 
 	@Override
@@ -91,8 +100,7 @@ public class OAuth2ClientAuthenticationProvider implements AuthenticationProvide
 
 		if (clientAuthentication.getCredentials() != null) {
 			String clientSecret = clientAuthentication.getCredentials().toString();
-			// TODO Use PasswordEncoder.matches()
-			if (!registeredClient.getClientSecret().equals(clientSecret)) {
+			if (!passwordEncoder.matches(clientSecret, registeredClient.getClientSecret())) {
 				throwInvalidClient();
 			}
 			authenticatedCredentials = true;

oauth2-authorization-server/src/test/java/org/springframework/security/oauth2/server/authorization/authentication/OAuth2ClientAuthenticationProviderTests.java

@@ -87,6 +87,13 @@ public class OAuth2ClientAuthenticationProviderTests {
 				.hasMessage("authorizationService cannot be null");
 	}
 
+	@Test
+	public void constructorWhenPasswordEncoderNullThenThrowIllegalArgumentException() {
+		assertThatThrownBy(() -> authenticationProvider.setPasswordEncoder(null))
+				.isInstanceOf(IllegalArgumentException.class)
+				.hasMessage("passwordEncoder cannot be null");
+	}
+
 	@Test
 	public void supportsWhenTypeOAuth2ClientAuthenticationTokenThenReturnTrue() {
 		assertThat(this.authenticationProvider.supports(OAuth2ClientAuthenticationToken.class)).isTrue();
@@ -144,7 +151,7 @@ public class OAuth2ClientAuthenticationProviderTests {
 				.thenReturn(registeredClient);
 
 		OAuth2ClientAuthenticationToken authentication = new OAuth2ClientAuthenticationToken(
-				registeredClient.getClientId(), registeredClient.getClientSecret(), ClientAuthenticationMethod.BASIC, null);
+				registeredClient.getClientId(), TestRegisteredClients.CLIENT_SECRET, ClientAuthenticationMethod.BASIC, null);
 		OAuth2ClientAuthenticationToken authenticationResult =
 				(OAuth2ClientAuthenticationToken) this.authenticationProvider.authenticate(authentication);
 		assertThat(authenticationResult.isAuthenticated()).isTrue();