SWS-972 - Handle UserDetailsService not finding user

SpringSecurityPasswordValidationCallbackHandler throws NPE when UserDetailsService does not find user. This adds a null check and additional test cases.

spring-ws-security/src/main/java/org/springframework/ws/soap/security/wss4j2/callback/SpringSecurityPasswordValidationCallbackHandler.java

@@ -33,6 +33,7 @@ import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.security.core.userdetails.cache.NullUserCache;
 import org.springframework.util.Assert;
 import org.springframework.ws.soap.security.callback.CleanupCallback;
+import org.springframework.ws.soap.security.support.SpringSecurityUtils;
 
 /**
  * Callback handler that validates a plain text or digest password using an Spring Security {@code UserDetailsService}.
@@ -76,8 +77,11 @@ public class SpringSecurityPasswordValidationCallbackHandler extends AbstractWsP
 	 * <p>Default implementation throws an {@link UnsupportedCallbackException}.
 	 */
 	protected void handleUsernameToken(WSPasswordCallback callback) throws IOException, UnsupportedCallbackException {
-		UserDetails details = loadUserDetails(callback.getIdentifier());
-		callback.setPassword(details.getPassword());
+		UserDetails user = loadUserDetails(callback.getIdentifier());
+		if (user != null) {
+			SpringSecurityUtils.checkUserValidity(user);
+			callback.setPassword(user.getPassword());
+		}
 	}
 
 	@Override

spring-ws-security/src/test/java/org/springframework/ws/soap/security/wss4j2/callback/SpringSecurityPasswordValidationCallbackHandlerTest.java

@@ -27,6 +27,8 @@ import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.security.core.userdetails.User;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.apache.wss4j.common.ext.WSPasswordCallback;
 import org.apache.wss4j.common.principal.WSUsernameTokenPrincipalImpl;
 import org.junit.Assert;
 import org.junit.Before;
@@ -42,6 +44,8 @@ public class SpringSecurityPasswordValidationCallbackHandlerTest {
 	private SimpleGrantedAuthority grantedAuthority;
 
 	private UsernameTokenPrincipalCallback callback;
+	
+	private WSPasswordCallback passwordCallback;
 
 	private UserDetails user;
 
@@ -54,6 +58,38 @@ public class SpringSecurityPasswordValidationCallbackHandlerTest {
 
 		WSUsernameTokenPrincipalImpl principal = new WSUsernameTokenPrincipalImpl("Ernie", true);
 		callback = new UsernameTokenPrincipalCallback(principal);
+		
+		passwordCallback = new WSPasswordCallback("Ernie", null, "type", WSPasswordCallback.USERNAME_TOKEN);
+	}
+	
+	@Test
+	public void testHandleUsernameToken() throws Exception {
+		UserDetailsService userDetailsService = createMock(UserDetailsService.class);
+		callbackHandler.setUserDetailsService(userDetailsService);
+
+		expect(userDetailsService.loadUserByUsername("Ernie")).andReturn(user).anyTimes();
+
+		replay(userDetailsService);
+
+		callbackHandler.handleUsernameToken(passwordCallback);
+		Assert.assertEquals("Bert", passwordCallback.getPassword());
+
+		verify(userDetailsService);
+	}
+	
+	@Test
+	public void testHandleUsernameTokenUserNotFound() throws Exception {
+		UserDetailsService userDetailsService = createMock(UserDetailsService.class);
+		callbackHandler.setUserDetailsService(userDetailsService);
+
+		expect(userDetailsService.loadUserByUsername("Ernie")).andThrow(new UsernameNotFoundException("User 'Ernie' not found"));
+
+		replay(userDetailsService);
+
+		callbackHandler.handleUsernameToken(passwordCallback);
+		Assert.assertNull(passwordCallback.getPassword());
+
+		verify(userDetailsService);
 	}
 
 	@Test