Fixed issue #310

configuration/esapi/ESAPI.properties

@@ -535,3 +535,10 @@ Validator.AcceptLenientDates=false
 #
 #Validator.HtmlValidationAction=clean
 Validator.HtmlValidationAction=throw
+
+# With the fix for #310 to enable loading antisamy-esapi.xml from the classpath
+# also an enhancement was made to be able to use a different filename for the configuration.
+# You don't have to configure the filename here, but in that case the code will keep looking for antisamy-esapi.xml.
+# This is the default behaviour of ESAPI.
+#
+#Validator.HtmlValidationConfigurationFile=antisamy-esapi.xml

src/main/java/org/owasp/esapi/SecurityConfiguration.java

@@ -640,7 +640,6 @@ public interface SecurityConfiguration extends EsapiPropertyLoader {
      */
     InputStream getResourceStream( String filename ) throws IOException;
 
-
 	/**
 	 * Sets the ESAPI resource directory.
 	 * 

src/main/java/org/owasp/esapi/reference/DefaultSecurityConfiguration.java

@@ -159,6 +159,7 @@ public static SecurityConfiguration getInstance() {
     public static final String VALIDATION_PROPERTIES_MULTIVALUED = "Validator.ConfigurationFile.MultiValued";
     public static final String ACCEPT_LENIENT_DATES = "Validator.AcceptLenientDates";
     public static final String VALIDATOR_HTML_VALIDATION_ACTION = "Validator.HtmlValidationAction";
+	public static final String VALIDATOR_HTML_VALIDATION_CONFIGURATION_FILE = "Validator.HtmlValidationConfigurationFile";
 
     /**
      * Special {@code System} property that, if set to {@code true}, will

src/main/java/org/owasp/esapi/reference/validation/HTMLValidationRule.java

@@ -30,6 +30,7 @@
 import org.owasp.validator.html.Policy;
 import org.owasp.validator.html.PolicyException;
 import org.owasp.validator.html.ScanException;
+import org.owasp.esapi.reference.DefaultSecurityConfiguration;
 
 
 /**
@@ -46,22 +47,113 @@ public class HTMLValidationRule extends StringValidationRule {
 	/** OWASP AntiSamy markup verification policy */
 	private static Policy antiSamyPolicy = null;
 	private static final Logger LOGGER = ESAPI.getLogger( "HTMLValidationRule" );
+	private static final String ANTISAMYPOLICY_FILENAME = "antisamy-esapi.xml";
+
+    /**
+     * Used to load antisamy-esapi.xml from a variety of different classpath locations.
+	 * The classpath locations are the same classpath locations as used to load esapi.properties.
+	 * See DefaultSecurityConfiguration.DefaultSearchPath.
+     *
+     * @param fileName The resource file filename.
+     */
+	private static InputStream getResourceStreamFromClasspath(String fileName) {
+		InputStream resourceStream = null;
+
+		ClassLoader[] loaders = new ClassLoader[] {
+				Thread.currentThread().getContextClassLoader(),
+				ClassLoader.getSystemClassLoader(),
+				ESAPI.securityConfiguration().getClass().getClassLoader()  
+						/* can't use just getClass.getClassLoader() in a static context, so using the DefaultSecurityConfiguration class. */
+		};
+
+		String[] classLoaderNames = {
+				"current thread context class loader",
+				"system class loader",
+				"class loader for DefaultSecurityConfiguration class"
+		};
+
+		int i = 0;
+        for (ClassLoader loader : loaders) {
+			// try root
+			String currentClasspathSearchLocation = "/ (root)";
+            resourceStream = loader.getResourceAsStream(DefaultSecurityConfiguration.DefaultSearchPath.ROOT.value() + fileName);
+
+			// try resourceDirectory folder
+			if (resourceStream == null){
+				currentClasspathSearchLocation = DefaultSecurityConfiguration.DefaultSearchPath.RESOURCE_DIRECTORY.value();
+				resourceStream = loader.getResourceAsStream(currentClasspathSearchLocation + fileName);
+			}
+
+			// try .esapi folder. Look here first for backward compatibility.
+			if (resourceStream == null){
+				currentClasspathSearchLocation = DefaultSecurityConfiguration.DefaultSearchPath.DOT_ESAPI.value();
+				resourceStream = loader.getResourceAsStream(currentClasspathSearchLocation + fileName);
+			}
+
+			// try esapi folder (new directory)
+			if (resourceStream == null){
+				currentClasspathSearchLocation = DefaultSecurityConfiguration.DefaultSearchPath.ESAPI.value();
+				resourceStream = loader.getResourceAsStream(currentClasspathSearchLocation + fileName);
+			}
+
+			// try resources folder
+			if (resourceStream == null){
+				currentClasspathSearchLocation = DefaultSecurityConfiguration.DefaultSearchPath.RESOURCES.value();
+				resourceStream = loader.getResourceAsStream(currentClasspathSearchLocation + fileName);
+			}
+
+			// try src/main/resources folder
+			if (resourceStream == null){
+				currentClasspathSearchLocation = DefaultSecurityConfiguration.DefaultSearchPath.SRC_MAIN_RESOURCES.value();
+				resourceStream = loader.getResourceAsStream(currentClasspathSearchLocation + fileName);
+			}
+
+            if (resourceStream != null) {
+				LOGGER.info(Logger.EVENT_FAILURE, "SUCCESSFULLY LOADED " + fileName + " via the CLASSPATH from '" + 
+					currentClasspathSearchLocation + "' using " + classLoaderNames[i] + "!");
+                break; // Outta here since we've found and loaded it.
+            }
+
+			i++;
+        }
+
+		return resourceStream;
+	}
 
 	static {
         InputStream resourceStream = null;
+		String antisamyPolicyFilename = null;
+
+		try {
+			antisamyPolicyFilename = ESAPI.securityConfiguration().getStringProp(
+                    // Future: This will be moved to a new PropNames class
+                org.owasp.esapi.reference.DefaultSecurityConfiguration.VALIDATOR_HTML_VALIDATION_CONFIGURATION_FILE );
+		} catch (ConfigurationException cex) {
+
+            LOGGER.info(Logger.EVENT_FAILURE, "ESAPI property " + 
+                           org.owasp.esapi.reference.DefaultSecurityConfiguration.VALIDATOR_HTML_VALIDATION_CONFIGURATION_FILE +
+                           " not set, using default value: " + ANTISAMYPOLICY_FILENAME);
+			antisamyPolicyFilename = ANTISAMYPOLICY_FILENAME;
+		}
 		try {
-			resourceStream = ESAPI.securityConfiguration().getResourceStream("antisamy-esapi.xml");
+			resourceStream = ESAPI.securityConfiguration().getResourceStream(antisamyPolicyFilename);
 		} catch (IOException e) {
-			throw new ConfigurationException("Couldn't find antisamy-esapi.xml", e);
-	            }
+
+			LOGGER.info(Logger.EVENT_FAILURE, "Loading " + antisamyPolicyFilename + " from classpaths");
+
+			resourceStream = getResourceStreamFromClasspath(antisamyPolicyFilename);
+		}
         if (resourceStream != null) {
         	try {
 				antiSamyPolicy = Policy.getInstance(resourceStream);
 			} catch (PolicyException e) {
-				throw new ConfigurationException("Couldn't parse antisamy policy", e);
-		        }
-			}
+				throw new ConfigurationException("Couldn't parse " + antisamyPolicyFilename, e);
+	        }
 		}
+        else {
+            throw new ConfigurationException("Couldn't find " + antisamyPolicyFilename);
+		}
+	}
 
 	public HTMLValidationRule( String typeName ) {
 		super( typeName );

src/test/java/org/owasp/esapi/reference/validation/HTMLValidationRuleClasspathTest.java

@@ -0,0 +1,171 @@
+/**
+ * OWASP Enterprise Security API (ESAPI)
+ *
+ * This file is part of the Open Web Application Security Project (OWASP)
+ * Enterprise Security API (ESAPI) project. For details, please see
+ * <a href="http://www.owasp.org/index.php/ESAPI">http://www.owasp.org/index.php/ESAPI</a>.
+ *
+ * Copyright (c) 2019 - The OWASP Foundation
+ *
+ * The ESAPI is published by OWASP under the BSD license. You should read and accept the
+ * LICENSE before you use, modify, and/or redistribute this software.
+ *
+ * @author [email protected]
+ * @since 2019
+ */
+package org.owasp.esapi.reference.validation;
+
+import org.owasp.esapi.ESAPI;
+import org.owasp.esapi.SecurityConfiguration;
+import org.owasp.esapi.SecurityConfigurationWrapper;
+import org.owasp.esapi.ValidationErrorList;
+import org.owasp.esapi.ValidationRule;
+import org.owasp.esapi.Validator;
+import org.owasp.esapi.errors.ValidationException;
+import org.owasp.esapi.reference.validation.HTMLValidationRule;
+
+import org.junit.Test;
+import org.junit.Before;
+import org.junit.After;
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
+import static org.junit.Assert.*;
+
+/**
+ * The Class HTMLValidationRuleThrowsTest.
+ *
+ * Based on original test cases, testGetValidSafeHTML() and
+ * testIsValidSafeHTML() from ValidatorTest by
+ *      Mike Fauzy ([email protected]) and
+ *      Jeff Williams ([email protected])
+ * that were originally part of src/test/java/org/owasp/esapi/reference/ValidatorTest.java.
+ *
+ * This class tests the cases where the new ESAPI.property
+ *      Validator.HtmlValidationAction
+ * is set to "throw", which causes certain calls to
+ * ESAPI.validator().getValidSafeHTML() or ESAPI.validator().isValidSafeHTML()
+ * to throw a ValidationException rather than simply logging a warning and returning
+ * the cleansed (sanitizied) output when certain unsafe input is encountered.
+ */
+public class HTMLValidationRuleClasspathTest {
+	private static class ConfOverride extends SecurityConfigurationWrapper {
+        private String desiredReturnAction = "clean";
+        private String desiredReturnConfigurationFile = "antisamy-esapi.xml";
+
+		ConfOverride(SecurityConfiguration orig, String desiredReturnAction, String desiredReturnConfigurationFile) {
+			super(orig);
+            this.desiredReturnAction = desiredReturnAction;
+			this.desiredReturnConfigurationFile = desiredReturnConfigurationFile;
+		}
+
+		@Override
+		public String getStringProp(String propName) {
+            // Would it be better making this file a static import?
+			if ( propName.equals( org.owasp.esapi.reference.DefaultSecurityConfiguration.VALIDATOR_HTML_VALIDATION_ACTION ) ) {
+                return desiredReturnAction;
+            } else if ( propName.equals( org.owasp.esapi.reference.DefaultSecurityConfiguration.VALIDATOR_HTML_VALIDATION_CONFIGURATION_FILE ) ) {
+                return desiredReturnConfigurationFile;
+            } else {
+                return super.getStringProp( propName );
+            }
+        }
+    }
+
+    // Must be public!
+    @Rule
+    public ExpectedException thrownEx = ExpectedException.none();
+
+    @After
+    public void tearDown() throws Exception {
+        ESAPI.override(null);
+        thrownEx = ExpectedException.none();
+    }
+
+	@Before
+    public void setUp() throws Exception {
+		ESAPI.override(
+			new ConfOverride( ESAPI.securityConfiguration(), "throw", "antisamy-esapi-CP.xml" )
+		);
+
+    }
+
+    @Test
+    public void testGetValid() throws Exception {
+        System.out.println("getValidCP");
+        Validator instance = ESAPI.validator();
+        HTMLValidationRule rule = new HTMLValidationRule("testCP");
+        ESAPI.validator().addRule(rule);
+
+        thrownEx.expect(ValidationException.class);
+        thrownEx.expectMessage("test: Invalid HTML input");
+
+        instance.getRule("testCP").getValid("test", "Test. <script>alert(document.cookie)</script>");
+    }
+
+    @Test
+    public void testGetValidSafeHTML() throws Exception {
+        System.out.println("getValidSafeHTML");
+        Validator instance = ESAPI.validator();
+
+        HTMLValidationRule rule = new HTMLValidationRule("test");
+        ESAPI.validator().addRule(rule);
+
+        String[] testInput = {
+                                // These first two don't cause AntiSamy to throw.
+                        // "Test. <a href=\"http://www.aspectsecurity.com\">Aspect Security</a>",
+                        // "Test. <<div on<script></script>load=alert()",
+                        "Test. <script>alert(document.cookie)</script>",
+                        "Test. <script>alert(document.cookie)</script>",
+                        "Test. <div style={xss:expression(xss)}>b</div>",
+                        "Test. <s%00cript>alert(document.cookie)</script>",
+                        "Test. <s\tcript>alert(document.cookie)</script>",
+                        "Test. <s\tcript>alert(document.cookie)</script>"
+        };
+
+        int errors = 0;
+        for( int i = 0; i < testInput.length; i++ ) {
+            try {
+                String result = instance.getValidSafeHTML("test", testInput[i], 100, false);
+                errors++;
+                System.out.println("testGetValidSafeHTML(): testInput '" + testInput[i] + "' failed to throw.");
+            }
+            catch( ValidationException vex ) {
+                System.out.println("testGetValidSafeHTML(): testInput '" + testInput[i] + "' returned:");
+                System.out.println("\t" + i + ": logMsg =" + vex.getLogMessage());
+                assertEquals( vex.getUserMessage(), "test: Invalid HTML input");
+            }
+            catch( Exception ex ) {
+                errors++;
+                System.out.println("testGetValidSafeHTML(): testInput '" + testInput[i] +
+                                   "' threw wrong exception type: " + ex.getClass().getName() );
+            }
+        }
+
+        if ( errors > 0 ) {
+            fail("testGetValidSafeHTML() encountered " + errors + " failures.");
+        }
+    }
+
+    @Test
+    public void testIsValidSafeHTML() {
+        System.out.println("isValidSafeHTML");
+        Validator instance = ESAPI.validator();
+        thrownEx = ExpectedException.none();    // Not expecting any exceptions here.
+
+        assertTrue(instance.isValidSafeHTML("test", "<b>Jeff</b>", 100, false));
+        assertTrue(instance.isValidSafeHTML("test", "<a href=\"http://www.aspectsecurity.com\">Aspect Security</a>", 100, false));
+        assertFalse(instance.isValidSafeHTML("test", "Test. <script>alert(document.cookie)</script>", 100, false));
+        assertFalse(instance.isValidSafeHTML("test", "Test. <div style={xss:expression(xss)}>", 100, false));
+        assertFalse(instance.isValidSafeHTML("test", "Test. <s%00cript>alert(document.cookie)</script>", 100, false));
+        assertFalse(instance.isValidSafeHTML("test", "Test. <s\tcript>alert(document.cookie)</script>", 100, false));
+        assertFalse(instance.isValidSafeHTML("test", "Test. <s\r\n\0cript>alert(document.cookie)</script>", 100, false));
+
+        ValidationErrorList errors = new ValidationErrorList();
+        assertFalse(instance.isValidSafeHTML("test1", "Test. <script>alert(document.cookie)</script>", 100, false, errors));
+        assertFalse(instance.isValidSafeHTML("test2", "Test. <div style={xss:expression(xss)}>", 100, false, errors));
+        assertFalse(instance.isValidSafeHTML("test3", "Test. <s%00cript>alert(document.cookie)</script>", 100, false, errors));
+        assertFalse(instance.isValidSafeHTML("test4", "Test. <s\tcript>alert(document.cookie)</script>", 100, false, errors));
+        assertFalse(instance.isValidSafeHTML("test5", "Test. <s\r\n\0cript>alert(document.cookie)</script>", 100, false, errors));
+        assertTrue( errors.size() == 5 );
+    }
+}

src/test/java/org/owasp/esapi/reference/validation/HTMLValidationRuleCleanTest.java

@@ -13,7 +13,7 @@
  * @author [email protected]
  * @since 2019
  */
-package org.owasp.esapi.reference;
+package org.owasp.esapi.reference.validation;
 
 import org.owasp.esapi.ESAPI;
 import org.owasp.esapi.EncoderConstants;

src/test/java/org/owasp/esapi/reference/validation/HTMLValidationRuleThrowsTest.java

@@ -13,7 +13,7 @@
  * @author [email protected]
  * @since 2019
  */
-package org.owasp.esapi.reference;
+package org.owasp.esapi.reference.validation;
 
 import org.owasp.esapi.ESAPI;
 import org.owasp.esapi.SecurityConfiguration;