New file to use Java HTML Sanitizer that implements old AntiSamy poli…

…cy. Contributed by Mike Samuel.

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

@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2007-2010, Arshan Dabirsiaghi, Jason Li
+ * Copyright (c) 2011, Mike Samuel [Convert from XML to Java]
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.  Redistributions in binary
+ * form must reproduce the above copyright notice, this list of conditions and
+ * the following disclaimer in the documentation and/or other materials
+ * provided with the distribution.  Neither the name of OWASP nor the names
+ * of its contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.owasp.esapi.reference.validation;
+
+import org.owasp.html.AttributePolicy;
+import org.owasp.html.Handler;
+import org.owasp.html.HtmlPolicyBuilder;
+import org.owasp.html.HtmlSanitizer;
+import org.owasp.html.HtmlStreamRenderer;
+
+import org.owasp.esapi.ESAPI;
+import org.owasp.esapi.Logger;
+import org.owasp.esapi.errors.IntrusionException;
+
+import java.io.IOException;
+
+/**
+ * This class implements the
+ * {@link AntiSamy https://www.owasp.org/index.php/Antisamy} functionality
+ * and its basic policy file originally used with ESAPI 2.0.1. It is intended
+ * to be immune to XSS and CSS phishing attacks.
+ *
+ * This code based on AntiSamyTest.java at:
+ * http://owasp-java-html-sanitizer.googlecode.com/svn/trunk/src/tests/org/owasp/html/AntiSamyTest.java
+ * by Mike Samuel. It has been rewritten (mostly be stripping out the JUnit
+ * tests) to be used with ESAPI.
+ *
+ * @author Arshan Dabirsiaghi (original AntiSamy rules, expressed as XML)
+ * @author Mike Samuel (converted AntiSamy XML rules to Java for HTML Sanitizer)
+ */
+public class HTMLSanitizerAntiSamyPolicy {
+  private static final Logger logger = ESAPI.getLogger("HTMLSanitizerAntiSamyRules");
+  private static HtmlSanitizer.Policy makePolicy(Appendable buffer) {
+    final HtmlStreamRenderer renderer = HtmlStreamRenderer.create(
+        buffer,
+        new Handler<IOException>() {
+          public void handle(IOException ex) {
+		  // OPEN ITEM: Some other exception type more appropriate here?
+            throw new IntrusionException("Error creating AntiSamy policy for HTML Sanitizer", ex);
+          }
+        },
+        new Handler<String>() {
+          public void handle(String errorMessage) {
+            logger.error(Logger.SECURITY_FAILURE, errorMessage);
+	    // OPEN ITEM: Should we also throw something here??? If so what?
+          }
+        });
+
+    return new HtmlPolicyBuilder()
+        .allowElements(
+            "a", "b", "br", "div", "font", "i", "img", "input", "li",
+            "ol", "p", "span", "td", "ul")
+        .allowAttributes("checked", "type").onElements("input")
+        .allowAttributes("color").onElements("font")
+        .allowAttributes("href").onElements("a")
+        .allowAttributes("src").onElements("img")
+        .allowAttributes("class", "id", "title").globally()
+        .allowAttributes("char").matching(
+            new AttributePolicy() {
+              public String apply(
+                  String elementName, String attributeName, String value) {
+                return value.length() == 1 ? value : null;
+              }
+            }).onElements("td")
+        .allowStandardUrlProtocols()
+        .requireRelNofollowOnLinks()
+        .allowStyling()
+        .build(renderer);
+  }
+
+  public static String sanitize(String dirtyHtml) {
+    StringBuilder sb = new StringBuilder();
+
+    HtmlSanitizer.sanitize(dirtyHtml, makePolicy(sb));
+
+    return sb.toString();
+  }
+}