Security Framework

/**
 * Annotation for authorization enforcement
 */
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface AuthEnforce {
    /**
     * List of entities to check authorization for
     * @return Array of entity patterns
     */
    String[] value() default {};
}

/**
 * Annotation for audit policy configuration
 */
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface AuditPolicy {
    /**
     * Audit policy value
     */
    String value();
}

/**
 * Annotation for specifying audit details
 */
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
public @interface AuditDetail {
    /**
     * Name of the audit detail field
     */
    String value();
}

import io.cdap.cdap.common.security.*;

// Method-level authorization
@Path("/api/v1/namespaces/{namespace}")
public class NamespaceHandler {
    
    @GET
    @Path("/applications")
    @AuthEnforce("namespace:{namespace}")
    @AuditPolicy("APPLICATION_LIST")
    public void listApplications(@PathParam("namespace") @AuditDetail("namespace") String namespace,
                                HttpRequest request, HttpResponder responder) {
        // This method requires authorization for the specified namespace
        // and will be audited with the APPLICATION_LIST policy
        List<Application> apps = applicationService.listApplications(namespace);
        responder.sendJson(HttpResponseStatus.OK, apps);
    }
    
    @DELETE
    @Path("/applications/{app}")
    @AuthEnforce({"namespace:{namespace}", "application:{app}"})
    @AuditPolicy("APPLICATION_DELETE")
    public void deleteApplication(@PathParam("namespace") @AuditDetail("namespace") String namespace,
                                 @PathParam("app") @AuditDetail("application") String appName,
                                 HttpRequest request, HttpResponder responder) {
        // Requires authorization for both namespace and application
        applicationService.deleteApplication(namespace, appName);
        responder.sendStatus(HttpResponseStatus.OK);
    }
}

// Class-level authorization
@AuthEnforce("admin")
@AuditPolicy("ADMIN_OPERATION")
@Path("/admin")
public class AdminHandler {
    
    @POST
    @Path("/reset")
    public void resetSystem(HttpRequest request, HttpResponder responder) {
        // All methods in this class require admin authorization
        systemService.reset();
        responder.sendStatus(HttpResponseStatus.OK);
    }
}

/**
 * KeyStore management utilities
 */
public class KeyStores {
    /**
     * Generate a self-signed certificate keystore
     */
    public static KeyStore generatedCertKeyStore(SConfiguration sConf, String password) 
        throws GeneralSecurityException, IOException;
    
    /**
     * Load keystore from file
     */
    public static KeyStore load(File keystoreFile, String password, String type) 
        throws GeneralSecurityException, IOException;
    
    /**
     * Create empty keystore of specified type
     */
    public static KeyStore createEmpty(String type) throws GeneralSecurityException;
    
    /**
     * Get certificate from keystore
     */
    public static Certificate getCertificate(KeyStore keyStore, String alias) 
        throws KeyStoreException;
}

/**
 * HTTPS configuration enabler
 */
public class HttpsEnabler {
    /**
     * Enable HTTPS for the given configuration
     */
    public static void enable(CConfiguration cConf, SConfiguration sConf);
    
    /**
     * Check if HTTPS is enabled in configuration
     */
    public static boolean isEnabled(CConfiguration cConf);
    
    /**
     * Get SSL context from configuration
     */
    public static SSLContext getSSLContext(CConfiguration cConf, SConfiguration sConf) 
        throws GeneralSecurityException, IOException;
}

/**
 * YARN delegation token utilities
 */
public class YarnTokenUtils {
    /**
     * Obtain delegation tokens for YARN services
     */
    public static Credentials obtainTokens(Configuration yarnConf, Credentials credentials) 
        throws IOException, InterruptedException;
    
    /**
     * Add delegation tokens to user credentials
     */
    public static void addTokens(Configuration yarnConf, Credentials credentials, 
                                String user, File tokenFile) throws IOException;
    
    /**
     * Write tokens to file
     */
    public static void writeTokens(Credentials credentials, File tokenFile) throws IOException;
    
    /**
     * Read tokens from file
     */
    public static Credentials readTokens(File tokenFile) throws IOException;
    
    /**
     * Check if tokens are valid and not expired
     */
    public static boolean areTokensValid(Credentials credentials);
}

/**
 * Authorization enforcement utilities
 */
public class AuthEnforceUtil {
    /**
     * Extract authorization entities from method annotations
     */
    public static Set<String> getAuthorizeEntities(Method method, Object[] args);
    
    /**
     * Check if method requires authorization
     */
    public static boolean requiresAuthorization(Method method);
    
    /**
     * Get audit policy from method or class annotations
     */
    public static String getAuditPolicy(Method method, Class<?> clazz);
    
    /**
     * Extract audit details from method parameters
     */
    public static Map<String, String> getAuditDetails(Method method, Object[] args);
    
    /**
     * Resolve entity patterns with actual parameter values
     */
    public static Set<String> resolveEntityPatterns(String[] patterns, 
                                                   Method method, Object[] args);
}

import io.cdap.cdap.common.security.*;
import javax.net.ssl.SSLContext;
import java.security.KeyStore;

// SSL/TLS configuration
public class SecureServiceConfig {
    private final CConfiguration cConf;
    private final SConfiguration sConf;
    
    public SecureServiceConfig(CConfiguration cConf, SConfiguration sConf) {
        this.cConf = cConf;
        this.sConf = sConf;
    }
    
    public void configureSSL() throws Exception {
        if (HttpsEnabler.isEnabled(cConf)) {
            // Generate or load keystore
            String keystorePassword = sConf.get("ssl.keystore.password", "changeit");
            KeyStore keyStore = KeyStores.generatedCertKeyStore(sConf, keystorePassword);
            
            // Get SSL context
            SSLContext sslContext = HttpsEnabler.getSSLContext(cConf, sConf);
            
            // Configure SSL for services
            configureServiceSSL(sslContext, keyStore);
        }
    }
    
    private void configureServiceSSL(SSLContext sslContext, KeyStore keyStore) {
        // Configure SSL settings for Netty services, etc.
    }
}

// YARN security integration
public class SecureYarnClient {
    public void setupSecureClient(Configuration yarnConf, String user) throws Exception {
        Credentials credentials = new Credentials();
        
        // Obtain delegation tokens
        YarnTokenUtils.obtainTokens(yarnConf, credentials);
        
        // Write tokens to file for secure access
        File tokenFile = new File("/tmp/yarn-tokens");
        YarnTokenUtils.writeTokens(credentials, tokenFile);
        
        // Add tokens to user credentials
        YarnTokenUtils.addTokens(yarnConf, credentials, user, tokenFile);
        
        // Check token validity
        if (!YarnTokenUtils.areTokensValid(credentials)) {
            System.out.println("Warning: Some tokens may be expired");
        }
    }
    
    public void refreshTokens(Configuration yarnConf, File tokenFile) throws Exception {
        // Read existing tokens
        Credentials existing = YarnTokenUtils.readTokens(tokenFile);
        
        if (!YarnTokenUtils.areTokensValid(existing)) {
            // Obtain fresh tokens
            Credentials fresh = YarnTokenUtils.obtainTokens(yarnConf, new Credentials());
            YarnTokenUtils.writeTokens(fresh, tokenFile);
        }
    }
}

// Authorization enforcement
public class SecurityEnforcer {
    public void enforceAuthorization(Method method, Object[] args, 
                                   AuthorizationContext authContext) throws ForbiddenException {
        
        if (!AuthEnforceUtil.requiresAuthorization(method)) {
            return; // No authorization required
        }
        
        // Get entities to authorize
        Set<String> entities = AuthEnforceUtil.getAuthorizeEntities(method, args);
        
        // Check authorization for each entity
        for (String entity : entities) {
            if (!authContext.isAuthorized(entity)) {
                throw new ForbiddenException("Not authorized for entity: " + entity);
            }
        }
    }
    
    public void auditMethodCall(Method method, Object[] args, String user) {
        String auditPolicy = AuthEnforceUtil.getAuditPolicy(method, method.getDeclaringClass());
        
        if (auditPolicy != null) {
            Map<String, String> auditDetails = AuthEnforceUtil.getAuditDetails(method, args);
            auditDetails.put("user", user);
            auditDetails.put("method", method.getName());
            
            // Log audit event
            auditLogger.log(auditPolicy, auditDetails);
        }
    }
}

// Custom authorization aspect/interceptor
public class AuthorizationInterceptor implements MethodInterceptor {
    private final SecurityEnforcer securityEnforcer;
    private final AuthorizationContext authContext;
    
    public AuthorizationInterceptor(SecurityEnforcer securityEnforcer,
                                  AuthorizationContext authContext) {
        this.securityEnforcer = securityEnforcer;
        this.authContext = authContext;
    }
    
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        Method method = invocation.getMethod();
        Object[] args = invocation.getArguments();
        
        // Enforce authorization
        securityEnforcer.enforceAuthorization(method, args, authContext);
        
        // Audit the method call
        String user = authContext.getPrincipal().getName();
        securityEnforcer.auditMethodCall(method, args, user);
        
        // Proceed with method execution
        return invocation.proceed();
    }
}