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package com.learn.xss; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; import java.util.logging.Logger; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * * HTML filtering utility for protecting against XSS (Cross Site Scripting). * * This code is licensed LGPLv3 * * This code is a Java port of the original work in PHP by Cal Hendersen. * http://code.iamcal.com/php/lib_filter/ * * The trickiest part of the translation was handling the differences in regex handling * between PHP and Java. These resources were helpful in the process: * * http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html * http://us2.php.net/manual/en/reference.pcre.pattern.modifiers.php * http://www.regular-expressions.info/modifiers.html * * A note on naming conventions: instance variables are prefixed with a "v"; global * constants are in all caps. * * Sample use: * String input = ... * String clean = new HTMLFilter().filter( input ); * * The class is not thread safe. Create a new instance if in doubt. * * If you find bugs or have suggestions on improvement (especially regarding * performance), please contact us. The latest version of this * source, and our contact details, can be found at http://xss-html-filter.sf.net * * @author Joseph O'Connell * @author Cal Hendersen * @author Michael Semb Wever */ public final class HTMLFilter { /** regex flag union representing /si modifiers in php **/ private static final int REGEX_FLAGS_SI = Pattern.CASE_INSENSITIVE | Pattern.DOTALL; private static final Pattern P_COMMENTS = Pattern.compile("<!--(.*?)-->", Pattern.DOTALL); private static final Pattern P_COMMENT = Pattern.compile("^!--(.*)--$", REGEX_FLAGS_SI); private static final Pattern P_TAGS = Pattern.compile("<(.*?)>", Pattern.DOTALL); private static final Pattern P_END_TAG = Pattern.compile("^/([a-z0-9]+)", REGEX_FLAGS_SI); private static final Pattern P_START_TAG = Pattern.compile("^([a-z0-9]+)(.*?)(/?)$", REGEX_FLAGS_SI); private static final Pattern P_QUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)=([\"'])(.*?)\\2", REGEX_FLAGS_SI); private static final Pattern P_UNQUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)(=)([^\"\\s']+)", REGEX_FLAGS_SI); private static final Pattern P_PROTOCOL = Pattern.compile("^([^:]+):", REGEX_FLAGS_SI); private static final Pattern P_ENTITY = Pattern.compile("&#(\\d+);?"); private static final Pattern P_ENTITY_UNICODE = Pattern.compile("&#x([0-9a-f]+);?"); private static final Pattern P_ENCODE = Pattern.compile("%([0-9a-f]{2});?"); private static final Pattern P_VALID_ENTITIES = Pattern.compile("&([^&;]*)(?=(;|&|$))"); private static final Pattern P_VALID_QUOTES = Pattern.compile("(>|^)([^<]+?)(<|$)", Pattern.DOTALL); private static final Pattern P_END_ARROW = Pattern.compile("^>"); private static final Pattern P_BODY_TO_END = Pattern.compile("<([^>]*?)(?=<|$)"); private static final Pattern P_XML_CONTENT = Pattern.compile("(^|>)([^<]*?)(?=>)"); private static final Pattern P_STRAY_LEFT_ARROW = Pattern.compile("<([^>]*?)(?=<|$)"); private static final Pattern P_STRAY_RIGHT_ARROW = Pattern.compile("(^|>)([^<]*?)(?=>)"); private static final Pattern P_AMP = Pattern.compile("&"); private static final Pattern P_QUOTE = Pattern.compile("\""); private static final Pattern P_LEFT_ARROW = Pattern.compile("<"); private static final Pattern P_RIGHT_ARROW = Pattern.compile(">"); private static final Pattern P_BOTH_ARROWS = Pattern.compile("<>"); // @xxx could grow large... maybe use sesat's ReferenceMap private static final ConcurrentMap<String,Pattern> P_REMOVE_PAIR_BLANKS = new ConcurrentHashMap<String, Pattern>(); private static final ConcurrentMap<String,Pattern> P_REMOVE_SELF_BLANKS = new ConcurrentHashMap<String, Pattern>(); /** set of allowed html elements, along with allowed attributes for each element **/ private final Map<String, List<String>> vAllowed; /** counts of open tags for each (allowable) html element **/ private final Map<String, Integer> vTagCounts = new HashMap<String, Integer>(); /** html elements which must always be self-closing (e.g. "<img />") **/ private final String[] vSelfClosingTags; /** html elements which must always have separate opening and closing tags (e.g. "<b></b>") **/ private final String[] vNeedClosingTags; /** set of disallowed html elements **/ private final String[] vDisallowed; /** attributes which should be checked for valid protocols **/ private final String[] vProtocolAtts; /** allowed protocols **/ private final String[] vAllowedProtocols; /** tags which should be removed if they contain no content (e.g. "<b></b>" or "<b />") **/ private final String[] vRemoveBlanks; /** entities allowed within html markup **/ private final String[] vAllowedEntities; /** flag determining whether comments are allowed in input String. */ private final boolean stripComment; private final boolean encodeQuotes; private boolean vDebug = false; /** * flag determining whether to try to make tags when presented with "unbalanced" * angle brackets (e.g. "<b text </b>" becomes "<b> text </b>"). If set to false, * unbalanced angle brackets will be html escaped. */ private final boolean alwaysMakeTags; /** Default constructor. * */ public HTMLFilter() { vAllowed = new HashMap<>(); final ArrayList<String> a_atts = new ArrayList<String>(); a_atts.add("href"); a_atts.add("target"); vAllowed.put("a", a_atts); final ArrayList<String> img_atts = new ArrayList<String>(); img_atts.add("src"); img_atts.add("width"); img_atts.add("height"); img_atts.add("alt"); vAllowed.put("img", img_atts); final ArrayList<String> no_atts = new ArrayList<String>(); vAllowed.put("b", no_atts); vAllowed.put("strong", no_atts); vAllowed.put("i", no_atts); vAllowed.put("em", no_atts); vSelfClosingTags = new String[]{"img"}; vNeedClosingTags = new String[]{"a", "b", "strong", "i", "em"}; vDisallowed = new String[]{}; vAllowedProtocols = new String[]{"http", "mailto", "https"}; // no ftp. vProtocolAtts = new String[]{"src", "href"}; vRemoveBlanks = new String[]{"a", "b", "strong", "i", "em"}; vAllowedEntities = new String[]{"amp", "gt", "lt", "quot"}; stripComment = true; encodeQuotes = true; alwaysMakeTags = true; } /** Set debug flag to true. Otherwise use default settings. See the default constructor. * * @param debug turn debug on with a true argument */ public HTMLFilter(final boolean debug) { this(); vDebug = debug; } /** Map-parameter configurable constructor. * * @param conf map containing configuration. keys match field names. */ public HTMLFilter(final Map<String,Object> conf) { assert conf.containsKey("vAllowed") : "configuration requires vAllowed"; assert conf.containsKey("vSelfClosingTags") : "configuration requires vSelfClosingTags"; assert conf.containsKey("vNeedClosingTags") : "configuration requires vNeedClosingTags"; assert conf.containsKey("vDisallowed") : "configuration requires vDisallowed"; assert conf.containsKey("vAllowedProtocols") : "configuration requires vAllowedProtocols"; assert conf.containsKey("vProtocolAtts") : "configuration requires vProtocolAtts"; assert