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// Copyright (c) 2011, Mike Samuel
// 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 the 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 HOLDER 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.html.examples;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Pattern;
import org.owasp.html.Handler;
import org.owasp.html.HtmlPolicyBuilder;
import org.owasp.html.HtmlSanitizer;
import org.owasp.html.HtmlStreamRenderer;
import org.owasp.html.PolicyFactory;
import com.google.common.base.Charsets;
import com.google.common.base.Predicate;
import com.google.common.io.CharStreams;
/**
* Based on the
* AntiSamy EBay example.
*
* eBay (http://www.ebay.com/) is the most popular online auction site in the
* universe, as far as I can tell. It is a public site so anyone is allowed to
* post listings with rich HTML content. It's not surprising that given the
* attractiveness of eBay as a target that it has been subject to a few complex
* XSS attacks. Listings are allowed to contain much more rich content than,
* say, Slashdot- so it's attack surface is considerably larger. The following
* tags appear to be accepted by eBay (they don't publish rules):
* {@code },...
*
*/
public class EbayPolicyExample {
// Some common regular expression definitions.
// The 16 colors defined by the HTML Spec (also used by the CSS Spec)
private static final Pattern COLOR_NAME = Pattern.compile(
"(?:aqua|black|blue|fuchsia|gray|grey|green|lime|maroon|navy|olive|purple"
+ "|red|silver|teal|white|yellow)");
// HTML/CSS Spec allows 3 or 6 digit hex to specify color
private static final Pattern COLOR_CODE = Pattern.compile(
"(?:#(?:[0-9a-fA-F]{3}(?:[0-9a-fA-F]{3})?))");
private static final Pattern NUMBER_OR_PERCENT = Pattern.compile(
"[0-9]+%?");
private static final Pattern PARAGRAPH = Pattern.compile(
"(?:[\\p{L}\\p{N},'\\.\\s\\-_\\(\\)]|&[0-9]{2};)*");
private static final Pattern HTML_ID = Pattern.compile(
"[a-zA-Z0-9\\:\\-_\\.]+");
// force non-empty with a '+' at the end instead of '*'
private static final Pattern HTML_TITLE = Pattern.compile(
"[\\p{L}\\p{N}\\s\\-_',:\\[\\]!\\./\\\\\\(\\)&]*");
private static final Pattern HTML_CLASS = Pattern.compile(
"[a-zA-Z0-9\\s,\\-_]+");
private static final Pattern ONSITE_URL = Pattern.compile(
"(?:[\\p{L}\\p{N}\\\\\\.\\#@\\$%\\+&;\\-_~,\\?=/!]+|\\#(\\w)+)");
private static final Pattern OFFSITE_URL = Pattern.compile(
"\\s*(?:(?:ht|f)tps?://|mailto:)[\\p{L}\\p{N}]"
+ "[\\p{L}\\p{N}\\p{Zs}\\.\\#@\\$%\\+&;:\\-_~,\\?=/!\\(\\)]*+\\s*");
private static final Pattern NUMBER = Pattern.compile(
"[+-]?(?:(?:[0-9]+(?:\\.[0-9]*)?)|\\.[0-9]+)");
private static final Pattern NAME = Pattern.compile("[a-zA-Z0-9\\-_\\$]+");
private static final Pattern ALIGN = Pattern.compile(
"(?i)center|left|right|justify|char");
private static final Pattern VALIGN = Pattern.compile(
"(?i)baseline|bottom|middle|top");
private static final Predicate COLOR_NAME_OR_COLOR_CODE
= matchesEither(COLOR_NAME, COLOR_CODE);
private static final Predicate ONSITE_OR_OFFSITE_URL
= matchesEither(ONSITE_URL, OFFSITE_URL);
private static final Pattern HISTORY_BACK = Pattern.compile(
"(?:javascript:)?\\Qhistory.go(-1)\\E");
private static final Pattern ONE_CHAR = Pattern.compile(
".?", Pattern.DOTALL);
/**
* A policy that can be used to produce policies that sanitize to HTML sinks
* via {@link PolicyFactory#apply}.
*/
public static final PolicyFactory POLICY_DEFINITION = new HtmlPolicyBuilder()
.allowAttributes("id").matching(HTML_ID).globally()
.allowAttributes("class").matching(HTML_CLASS).globally()
.allowAttributes("lang").matching(Pattern.compile("[a-zA-Z]{2,20}"))
.globally()
.allowAttributes("title").matching(HTML_TITLE).globally()
.allowStyling()
.allowAttributes("align").matching(ALIGN).onElements("p")
.allowAttributes("for").matching(HTML_ID).onElements("label")
.allowAttributes("color").matching(COLOR_NAME_OR_COLOR_CODE)
.onElements("font")
.allowAttributes("face")
.matching(Pattern.compile("[\\w;, \\-]+"))
.onElements("font")
.allowAttributes("size").matching(NUMBER).onElements("font")
.allowAttributes("href").matching(ONSITE_OR_OFFSITE_URL)
.onElements("a")
.allowStandardUrlProtocols()
.allowAttributes("nohref").onElements("a")
.allowAttributes("name").matching(NAME).onElements("a")
.allowAttributes(
"onfocus", "onblur", "onclick", "onmousedown", "onmouseup")
.matching(HISTORY_BACK).onElements("a")
.requireRelNofollowOnLinks()
.allowAttributes("src").matching(ONSITE_OR_OFFSITE_URL)
.onElements("img")
.allowAttributes("name").matching(NAME)
.onElements("img")
.allowAttributes("alt").matching(PARAGRAPH)
.onElements("img")
.allowAttributes("border", "hspace", "vspace").matching(NUMBER)
.onElements("img")
.allowAttributes("border", "cellpadding", "cellspacing")
.matching(NUMBER).onElements("table")
.allowAttributes("bgcolor").matching(COLOR_NAME_OR_COLOR_CODE)
.onElements("table")
.allowAttributes("background").matching(ONSITE_URL)
.onElements("table")
.allowAttributes("align").matching(ALIGN)
.onElements("table")
.allowAttributes("noresize").matching(Pattern.compile("(?i)noresize"))
.onElements("table")
.allowAttributes("background").matching(ONSITE_URL)
.onElements("td", "th", "tr")
.allowAttributes("bgcolor").matching(COLOR_NAME_OR_COLOR_CODE)
.onElements("td", "th")
.allowAttributes("abbr").matching(PARAGRAPH)
.onElements("td", "th")
.allowAttributes("axis", "headers").matching(NAME)
.onElements("td", "th")
.allowAttributes("scope")
.matching(Pattern.compile("(?i)(?:row|col)(?:group)?"))
.onElements("td", "th")
.allowAttributes("nowrap")
.onElements("td", "th")
.allowAttributes("height", "width").matching(NUMBER_OR_PERCENT)
.onElements("table", "td", "th", "tr", "img")
.allowAttributes("align").matching(ALIGN)
.onElements("thead", "tbody", "tfoot", "img",
"td", "th", "tr", "colgroup", "col")
.allowAttributes("valign").matching(VALIGN)
.onElements("thead", "tbody", "tfoot",
"td", "th", "tr", "colgroup", "col")
.allowAttributes("charoff").matching(NUMBER_OR_PERCENT)
.onElements("td", "th", "tr", "colgroup", "col",
"thead", "tbody", "tfoot")
.allowAttributes("char").matching(ONE_CHAR)
.onElements("td", "th", "tr", "colgroup", "col",
"thead", "tbody", "tfoot")
.allowAttributes("colspan", "rowspan").matching(NUMBER)
.onElements("td", "th")
.allowAttributes("span", "width").matching(NUMBER_OR_PERCENT)
.onElements("colgroup", "col")
.allowElements(
"a", "label", "noscript", "h1", "h2", "h3", "h4", "h5", "h6",
"p", "i", "b", "u", "strong", "em", "small", "big", "pre", "code",
"cite", "samp", "sub", "sup", "strike", "center", "blockquote",
"hr", "br", "col", "font", "map", "span", "div", "img",
"ul", "ol", "li", "dd", "dt", "dl", "tbody", "thead", "tfoot",
"table", "td", "th", "tr", "colgroup", "fieldset", "legend")
.toFactory();
/**
* A test-bed that reads HTML from stdin and writes sanitized content to
* stdout.
*/
public static void main(String[] args) throws IOException {
if (args.length != 0) {
System.err.println("Reads from STDIN and writes to STDOUT");
System.exit(-1);
}
System.err.println("[Reading from STDIN]");
// Fetch the HTML to sanitize.
String html = CharStreams.toString(
new InputStreamReader(System.in, Charsets.UTF_8));
// Set up an output channel to receive the sanitized HTML.
HtmlStreamRenderer renderer = HtmlStreamRenderer.create(
System.out,
// Receives notifications on a failure to write to the output.
new Handler() {
public void handle(IOException ex) {
// System.out suppresses IOExceptions
throw new AssertionError(null, ex);
}
},
// Our HTML parser is very lenient, but this receives notifications on
// truly bizarre inputs.
new Handler() {
public void handle(String x) {
throw new AssertionError(x);
}
});
// Use the policy defined above to sanitize the HTML.
HtmlSanitizer.sanitize(html, POLICY_DEFINITION.apply(renderer));
}
private static Predicate matchesEither(
final Pattern a, final Pattern b) {
return new Predicate() {
public boolean apply(String s) {
return a.matcher(s).matches() || b.matcher(s).matches();
}
// Needed for Java8 compatibility with later Guava that extends
// java.util.function.Predicate.
// For some reason the default test method implementation that calls
// through to apply is not assumed here.
@SuppressWarnings("all")
public boolean test(String s) {
return apply(s);
}
};
}
}
