NIFI-5595 - Added the CORS filter to the templates/upload endpoint us…

…ing a URL matcher.

Explicitly allow methods GET, HEAD. These are the Spring defaults when the allowedMethods is empty but now it is explicit. This will require other methods like POST etc to be from the same origin (for the template/upload URL).

This closes #3024.

Signed-off-by: Andy LoPresto <alopresto@apache.org>

nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-api/src/main/java/org/apache/nifi/web/NiFiWebApiSecurityConfiguration.java

@@ -43,6 +43,11 @@
 import org.springframework.security.config.http.SessionCreationPolicy;
 import org.springframework.security.web.authentication.AnonymousAuthenticationFilter;
 import org.springframework.security.web.authentication.preauth.x509.X509PrincipalExtractor;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.cors.CorsConfigurationSource;
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
+
+import java.util.Arrays;
 
 /**
  * NiFi Web Api Spring security
@@ -89,6 +94,7 @@ public void configure(WebSecurity webSecurity) throws Exception {
     @Override
     protected void configure(HttpSecurity http) throws Exception {
         http
+                .cors().and()
                 .rememberMe().disable()
                 .authorizeRequests()
                     .anyRequest().fullyAuthenticated()
@@ -112,6 +118,16 @@ protected void configure(HttpSecurity http) throws Exception {
         http.anonymous().authenticationFilter(anonymousFilterBean());
     }
 
+
+    @Bean
+    CorsConfigurationSource corsConfigurationSource() {
+        CorsConfiguration configuration = new CorsConfiguration();
+        configuration.setAllowedMethods(Arrays.asList("HEAD", "GET"));
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        source.registerCorsConfiguration("/process-groups/*/templates/upload", configuration);
+        return source;
+    }
+
     @Bean
     @Override
     public AuthenticationManager authenticationManagerBean() throws Exception {